     1                                  ; ****************************************************************************
     2                                  ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0
     3                                  ; ----------------------------------------------------------------------------
     4                                  ; Last Update: 23/04/2017
     5                                  ; ----------------------------------------------------------------------------
     6                                  ; Beginning: 04/01/2016
     7                                  ; ----------------------------------------------------------------------------
     8                                  ; Assembler: NASM version 2.11 (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                                  
    22                                  KLOAD	equ 10000h ; Kernel loading address
    23                                  	; NOTE: Retro UNIX 8086 v1 /boot code loads kernel at 1000h:0000h 
    24                                  KCODE	equ 08h	; Code segment descriptor (ring 0)
    25                                  KDATA	equ 10h	; Data segment descriptor (ring 0)
    26                                  ; 19/03/2015
    27                                  UCODE	equ 1Bh ; 18h + 3h  (ring 3)
    28                                  UDATA	equ 23h ; 20h + 3h  (ring 3)
    29                                  ; 24/03/2015
    30                                  TSS	equ 28h	; Task state segment descriptor (ring 0)
    31                                  ; 19/03/2015
    32                                  CORE	equ 400000h  ; Start of USER's virtual/linear address space 
    33                                  		     ; (at the end of the 1st 4MB)
    34                                  ECORE	equ 0FFC00000h ; End of USER's virtual address space (4GB - 4MB)
    35                                  		     ; ULIMIT = (ECORE/4096) - 1 = 0FFBFFh (in GDT)
    36                                  
    37                                  ;; 27/12/2013
    38                                  ;KEND    equ KLOAD + 65536 ; (28/12/2013) (end of kernel space)
    39                                  ; 04/07/2016
    40                                  KEND    equ KERNELFSIZE + KLOAD
    41                                  
    42                                  
    43                                  
    44                                  ; IBM PC/AT BIOS ----- 10/06/85 (postequ.inc)
    45                                  ;--------- CMOS TABLE LOCATION ADDRESS'S -------------------------------------
    46                                  CMOS_SECONDS	EQU	00H		; SECONDS (BCD)
    47                                  CMOS_SEC_ALARM	EQU	01H		; SECONDS ALARM (BCD)
    48                                  CMOS_MINUTES	EQU	02H		; MINUTES (BCD)
    49                                  CMOS_MIN_ALARM	EQU	03H		; MINUTES ALARM (BCD) 	
    50                                  CMOS_HOURS	EQU	04H		; HOURS (BCD
    51                                  CMOS_HR_ALARM	EQU	005H		; HOURS ALARM   (BCD)
    52                                  CMOS_DAY_WEEK	EQU	06H		; DAY OF THE WEEK  (BCD)
    53                                  CMOS_DAY_MONTH	EQU	07H		; DAY OF THE MONTH (BCD) 
    54                                  CMOS_MONTH	EQU	08H		; MONTH (BCD)
    55                                  CMOS_YEAR	EQU	09H		; YEAR (TWO DIGITS) (BCD)
    56                                  CMOS_CENTURY	EQU	32H		; DATE CENTURY BYTE (BCD)
    57                                  CMOS_REG_A	EQU	0AH		; STATUS REGISTER A
    58                                  CMOS_REG_B	EQU	00BH		; STATUS REGISTER B  ALARM
    59                                  CMOS_REG_C	EQU	00CH		; STATUS REGISTER C  FLAGS
    60                                  CMOS_REG_D	EQU	0DH		; STATUS REGISTER D  BATTERY
    61                                  CMOS_SHUT_DOWN	EQU	0FH		; SHUTDOWN STATUS COMMAND BYTE
    62                                  ;----------------------------------------
    63                                  ;	CMOS EQUATES FOR THIS SYSTEM	;
    64                                  ;-----------------------------------------------------------------------------
    65                                  CMOS_PORT	EQU	070H		; I/O ADDRESS OF CMOS ADDRESS PORT
    66                                  CMOS_DATA	EQU	071H		; I/O ADDRESS OF CMOS DATA PORT
    67                                  NMI		EQU	10000000B	; DISABLE NMI INTERRUPTS MASK -
    68                                  					; HIGH BIT OF CMOS LOCATION ADDRESS
    69                                  
    70                                  ; Memory Allocation Table Address
    71                                  ; 05/11/2014
    72                                  ; 31/10/2014
    73                                  MEM_ALLOC_TBL	equ	100000h		; Memory Allocation Table at the end of
    74                                  					; the 1st 1 MB memory space.
    75                                  					; (This address must be aligned
    76                                  					;  on 128 KB boundary, if it will be
    77                                  					;  changed later.)
    78                                  					; ((lower 17 bits of 32 bit M.A.T.
    79                                  					;   address must be ZERO)).
    80                                  					; ((((Reason: 32 bit allocation 
    81                                  					;     instructions, dword steps)))
    82                                  					; (((byte >> 12 --> page >> 5)))  
    83                                  ;04/11/2014	
    84                                  PDE_A_PRESENT	equ	1		; Present flag for PDE
    85                                  PDE_A_WRITE	equ 	2		; Writable (write permission) flag
    86                                  PDE_A_USER	equ	4		; User (non-system/kernel) page flag
    87                                  ;
    88                                  PTE_A_PRESENT	equ	1		; Present flag for PTE (bit 0)
    89                                  PTE_A_WRITE	equ 	2		; Writable (write permission) flag (bit 1)
    90                                  PTE_A_USER	equ	4		; User (non-system/kernel) page flag (bit 2)
    91                                  PTE_A_ACCESS    equ	32		; Accessed flag (bit 5) ; 09/03/2015
    92                                  
    93                                  ; 17/02/2015 (unix386.s)
    94                                  ; 10/12/2014 - 30/12/2014 (0B000h -> 9000h) (dsectrm2.s)
    95                                  DPT_SEGM equ 09000h  ; FDPT segment (EDD v1.1, EDD v3)
    96                                  ;
    97                                  HD0_DPT	 equ 0	    ; Disk parameter table address for hd0
    98                                  HD1_DPT	 equ 32	    ; Disk parameter table address for hd1
    99                                  HD2_DPT	 equ 64	    ; Disk parameter table address for hd2
   100                                  HD3_DPT	 equ 96	    ; Disk parameter table address for hd3
   101                                  
   102                                  
   103                                  ; FDPT (Phoenix, Enhanced Disk Drive Specification v1.1, v3.0)
   104                                  ;      (HDPT: Programmer's Guide to the AMIBIOS, 1993)
   105                                  ;
   106                                  FDPT_CYLS	equ 0 ; 1 word, number of cylinders
   107                                  FDPT_HDS	equ 2 ; 1 byte, number of heads
   108                                  FDPT_TT		equ 3 ; 1 byte, A0h = translated FDPT with logical values
   109                                  		      ; otherwise it is standard FDPT with physical values 	
   110                                  FDPT_PCMP	equ 5 ; 1 word, starting write precompensation cylinder
   111                                  		      ; (obsolete for IDE/ATA drives)
   112                                  FDPT_CB		equ 8 ; 1 byte, drive control byte
   113                                  			; Bits 7-6 : Enable or disable retries (00h = enable)
   114                                  			; Bit 5	: 1 = Defect map is located at last cyl. + 1
   115                                  			; Bit 4 : Reserved. Always 0
   116                                  			; Bit 3 : Set to 1 if more than 8 heads
   117                                  			; Bit 2-0 : Reserved. Alsways 0
   118                                  FDPT_LZ		equ 12 ; 1 word, landing zone (obsolete for IDE/ATA drives)
   119                                  FDPT_SPT	equ 14 ; 1 byte, sectors per track
   120                                  
   121                                  ; Floppy Drive Parameters Table (Programmer's Guide to the AMIBIOS, 1993)
   122                                  ; (11 bytes long) will be used by diskette handler/bios
   123                                  ; which is derived from IBM PC-AT BIOS (DISKETTE.ASM, 21/04/1986).
   124                                  
   125                                  ; 01/02/2016
   126                                  Logical_DOSDisks equ 90000h + 100h ; 26*256 = 6656 bytes
   127                                  Directory_Buffer equ 80000h ; max = 64K Bytes
   128                                  FAT_Buffer	 equ 91C00h ; 1536 bytes (3 sectors)
   129                                  ; 15/02/2016
   130                                  Cluster_Buffer	 equ 70000h ; max = 64K Bytes ; buffer for file read & write
   131                                  ; 11/04/2016
   132                                  Env_Page:	 equ 93000h ; 512 bytes (4096 bytes)
   133                                  Env_Page_Size	 equ 512    ; (4096 bytes)
   134                                  ; 30/07/2016
   135                                  Video_Pg_Backup	 equ 98000h ; Mode 3h, video page backup (32K, 8 pages)				 	  		 	  
   136                                  
   137                                  [BITS 16]       ; We need 16-bit intructions for Real mode
   138                                  
   139                                  [ORG 0] 
   140                                  	; 12/11/2014
   141                                  	; Save boot drive number (that is default root drive)
   142 00000000 8816[525C]              	mov	[boot_drv], dl ; physical drv number
   143                                  
   144                                  	; Determine installed memory
   145                                  	; 31/10/2014
   146                                  	;
   147 00000004 B801E8                  	mov	ax, 0E801h ; Get memory size 
   148 00000007 CD15                    	int	15h	   ; for large configurations
   149 00000009 7308                    	jnc	short chk_ms
   150 0000000B B488                    	mov	ah, 88h    ; Get extended memory size 
   151 0000000D CD15                    	int	15h
   152                                  	;	   
   153                                  	;mov	al, 17h	; Extended memory (1K blocks) low byte
   154                                  	;out	70h, al ; select CMOS register
   155                                  	;in	al, 71h ; read data (1 byte)
   156                                  	;mov	cl, al
   157                                  	;mov	al, 18h ; Extended memory (1K blocks) high byte
   158                                  	;out	70h, al ; select CMOS register
   159                                  	;in	al, 71h ; read data (1 byte)
   160                                  	;mov	ch, al
   161                                   	;      
   162 0000000F 89C1                    	mov	cx, ax
   163 00000011 31D2                    	xor	dx, dx
   164                                  chk_ms:
   165 00000013 890E[4E5C]              	mov	[mem_1m_1k], cx
   166 00000017 8916[505C]              	mov	[mem_16m_64k], dx
   167                                  	; 05/11/2014
   168                                  	;and	dx, dx
   169                                  	;jz	short L2
   170 0000001B 81F90004                        cmp     cx, 1024
   171 0000001F 7351                    	jnb	short L0
   172                                  		 ; insufficient memory_error	
   173                                  		 ; Minimum 2 MB memory is needed... 
   174                                  	; 05/11/2014
   175                                  	; (real mode error printing)
   176 00000021 FB                      	sti
   177 00000022 BE[3600]                	mov	si, msg_out_of_memory
   178 00000025 BB0700                  	mov	bx, 7
   179 00000028 B40E                    	mov	ah, 0Eh	; write tty
   180                                  oom_1:
   181 0000002A AC                      	lodsb
   182 0000002B 08C0                    	or	al, al
   183 0000002D 7404                    	jz	short oom_2
   184 0000002F CD10                    	int	10h
   185 00000031 EBF7                    	jmp	short oom_1
   186                                  oom_2:
   187 00000033 F4                              hlt
   188 00000034 EBFD                    	jmp	short oom_2
   189                                  
   190                                  ; 20/02/2017
   191                                  ; 05/11/2014
   192                                  msg_out_of_memory:
   193 00000036 070D0A                  	db 	07h, 0Dh, 0Ah
   194 00000039 496E73756666696369-             db      'Insufficient memory !'
   194 00000042 656E74206D656D6F72-
   194 0000004B 792021             
   195 0000004E 0D0A                    	db	0Dh, 0Ah
   196                                  _int13h_48h_buffer: ; 07/07/2016
   197 00000050 284D696E696D756D20-     	db	'(Minimum 2MB memory is needed.)'
   197 00000059 324D42206D656D6F72-
   197 00000062 79206973206E656564-
   197 0000006B 65642E29           
   198 0000006F 0D0A00                   	db	0Dh, 0Ah, 0
   199                                  	;
   200                                  
   201                                  L0:
   202                                  %include 'diskinit.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - diskinit.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 09/07/2016
     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> ; 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> 	; 10/12/2014 - 02/02/2015 - dsectrm2.s
    27                              <1> ;L0:
    28                              <1> 	; 12/11/2014 (Retro UNIX 386 v1 - beginning)
    29                              <1> 	; Detecting disk drives... (by help of ROM-BIOS)
    30 00000072 BA7F00              <1> 	mov	dx, 7Fh
    31                              <1> L1:	
    32 00000075 FEC2                <1> 	inc	dl
    33 00000077 B441                <1> 	mov	ah, 41h ; Check extensions present
    34                              <1> 			; Phoenix EDD v1.1 - EDD v3
    35 00000079 BBAA55              <1> 	mov	bx, 55AAh
    36 0000007C CD13                <1> 	int 	13h
    37 0000007E 721A                <1> 	jc	short L2
    38                              <1> 
    39 00000080 81FB55AA            <1> 	cmp	bx, 0AA55h
    40 00000084 7514                <1> 	jne	short L2
    41 00000086 FE06[555C]          <1> 	inc	byte [hdc]	; count of hard disks (EDD present)
    42 0000008A 8816[545C]          <1>         mov     [last_drv], dl  ; last hard disk number
    43 0000008E BB[D85B]            <1> 	mov	bx, hd0_type - 80h
    44 00000091 01D3                <1> 	add	bx, dx	 
    45 00000093 880F                <1> 	mov	[bx], cl ; Interface support bit map in CX
    46                              <1> 			 ; Bit 0 - 1, Fixed disk access subset ready
    47                              <1> 			 ; Bit 1 - 1, Drv locking and ejecting ready
    48                              <1> 			 ; Bit 2 - 1, Enhanced Disk Drive Support
    49                              <1>                          ;            (EDD) ready (DPTE ready)
    50                              <1> 			 ; Bit 3 - 1, 64bit extensions are present
    51                              <1>                          ;            (EDD-3)
    52                              <1> 			 ; Bit 4 to 15 - 0, Reserved
    53 00000095 80FA83              <1> 	cmp	dl, 83h	 ; drive number < 83h
    54 00000098 72DB                <1> 	jb	short L1
    55                              <1> L2:
    56                              <1> 	; 23/11/2014
    57                              <1> 	; 19/11/2014
    58 0000009A 30D2                <1> 	xor	dl, dl  ; 0
    59                              <1> 	; 04/02/2016 (esi -> si)
    60 0000009C BE[565C]            <1> 	mov	si, fd0_type
    61                              <1> L3:
    62                              <1> 	; 14/01/2015
    63 0000009F 8816[535C]          <1> 	mov	[drv], dl
    64                              <1> 	;
    65 000000A3 B408                <1> 	mov 	ah, 08h ; Return drive parameters
    66 000000A5 CD13                <1> 	int	13h	
    67 000000A7 7210                <1> 	jc	short L4
    68                              <1> 		; BL = drive type (for floppy drives)
    69                              <1> 		; DL = number of floppy drives
    70                              <1> 		;		
    71                              <1> 		; ES:DI = Address of DPT from BIOS
    72                              <1> 		;
    73 000000A9 881C                <1> 	mov	[si], bl ;  Drive type
    74                              <1> 			; 4 = 1.44 MB, 80 track, 3 1/2"
    75                              <1> 	; 14/01/2015
    76 000000AB E8BC01              <1> 	call	set_disk_parms
    77                              <1> 	; 10/12/2014
    78 000000AE 81FE[565C]          <1> 	cmp	si, fd0_type
    79 000000B2 7705                <1> 	ja	short L4
    80 000000B4 46                  <1> 	inc	si ; fd1_type
    81 000000B5 B201                <1> 	mov	dl, 1
    82 000000B7 EBE6                <1> 	jmp	short L3
    83                              <1> L4:
    84                              <1> 	; Older BIOS (INT 13h, AH = 48h is not available)
    85 000000B9 B27F                <1> 	mov	dl, 7Fh
    86                              <1> 	; 24/12/2014 (Temporary)
    87 000000BB 803E[555C]00        <1> 	cmp	byte [hdc], 0 ; EDD present or not ?	
    88 000000C0 0F879000            <1>         ja      L10       ; yes, all fixed disk operations
    89                              <1> 			  ; will be performed according to
    90                              <1> 			  ; present EDD specification
    91                              <1> L6:
    92 000000C4 FEC2                <1> 	inc 	dl
    93 000000C6 8816[535C]          <1>         mov     [drv], dl
    94 000000CA 8816[545C]          <1>         mov     [last_drv], dl ; 14/01/2015
    95 000000CE B408                <1> 	mov 	ah, 08h ; Return drive parameters
    96 000000D0 CD13                <1> 	int	13h	; (conventional function)
    97 000000D2 0F828601            <1>         jc      L13	; fixed disk drive not ready
    98 000000D6 8816[555C]          <1>         mov     [hdc], dl ; number of drives
    99                              <1> 	;; 14/01/2013
   100                              <1> 	;;push	cx
   101 000000DA E88D01              <1> 	call	set_disk_parms
   102                              <1> 	;;pop	cx
   103                              <1> 	;
   104                              <1> 	;;and	cl, 3Fh	 ; sectors per track (bits 0-6)
   105 000000DD 8A16[535C]          <1>         mov     dl, [drv]
   106 000000E1 BB0401              <1> 	mov	bx, 65*4 ; hd0 parameters table (INT 41h)	
   107 000000E4 80FA80              <1> 	cmp	dl, 80h
   108 000000E7 7603                <1> 	jna	short L7
   109 000000E9 83C314              <1> 	add	bx, 5*4	 ; hd1 parameters table (INT 46h)
   110                              <1> L7:	
   111 000000EC 31C0                <1> 	xor	ax, ax
   112 000000EE 8ED8                <1> 	mov	ds, ax
   113 000000F0 8B37                <1>         mov     si, [bx]
   114 000000F2 8B4702              <1>         mov     ax, [bx+2] 
   115 000000F5 8ED8                <1> 	mov	ds, ax
   116 000000F7 3A4C0E              <1>         cmp     cl, [si+FDPT_SPT] ; sectors per track 
   117 000000FA 0F855A01            <1>         jne     L12 ; invalid FDPT
   118 000000FE BF0000              <1> 	mov	di, HD0_DPT
   119 00000101 80FA80              <1> 	cmp	dl, 80h
   120 00000104 7603                <1> 	jna	short L8
   121 00000106 BF2000              <1> 	mov	di, HD1_DPT 
   122                              <1> L8:
   123                              <1> 	; 30/12/2014
   124 00000109 B80090              <1> 	mov	ax, DPT_SEGM
   125 0000010C 8EC0                <1> 	mov	es, ax
   126                              <1> 	; 24/12/2014
   127 0000010E B90800              <1> 	mov	cx, 8
   128 00000111 F3A5                <1> 	rep	movsw  ; copy 16 bytes to the kernel's DPT location
   129 00000113 8CC8                <1> 	mov	ax, cs
   130 00000115 8ED8                <1> 	mov	ds, ax
   131                              <1> 	; 02/02/2015
   132 00000117 8A0E[535C]          <1>         mov     cl, [drv]
   133 0000011B 88CB                <1> 	mov	bl, cl
   134 0000011D B8F001              <1> 	mov	ax, 1F0h
   135 00000120 80E301              <1> 	and	bl, 1
   136 00000123 7406                <1> 	jz	short L9
   137 00000125 C0E304              <1> 	shl	bl, 4
   138 00000128 2D8000              <1> 	sub	ax, 1F0h-170h
   139                              <1> L9:
   140 0000012B AB                  <1> 	stosw	; I/O PORT Base Address (1F0h, 170h)
   141 0000012C 050602              <1> 	add	ax, 206h
   142 0000012F AB                  <1> 	stosw	; CONTROL PORT Address (3F6h, 376h)	
   143 00000130 88D8                <1> 	mov	al, bl
   144 00000132 04A0                <1> 	add	al, 0A0h
   145 00000134 AA                  <1> 	stosb	; Device/Head Register upper nibble
   146                              <1> 	;
   147 00000135 FE06[535C]          <1> 	inc	byte [drv]
   148 00000139 BB[D85B]            <1> 	mov	bx, hd0_type - 80h
   149 0000013C 01CB                <1> 	add	bx, cx
   150 0000013E 800F80              <1>         or      byte [bx], 80h  ; present sign (when lower nibble is 0)
   151 00000141 A0[555C]            <1> 	mov	al, [hdc]
   152 00000144 FEC8                <1> 	dec	al
   153 00000146 0F841201            <1>         jz      L13
   154 0000014A 80FA80              <1> 	cmp	dl, 80h
   155 0000014D 0F8673FF            <1>         jna     L6
   156 00000151 E90801              <1>         jmp     L13
   157                              <1> L10:
   158 00000154 FEC2                <1> 	inc 	dl
   159                              <1> 	; 25/12/2014
   160 00000156 8816[535C]          <1> 	mov	[drv], dl
   161 0000015A B408                <1> 	mov 	ah, 08h ; Return drive parameters
   162 0000015C CD13                <1> 	int	13h	; (conventional function)
   163 0000015E 0F82FA00            <1>         jc      L13
   164                              <1> 	; 14/01/2015
   165 00000162 8A16[535C]          <1> 	mov	dl, [drv]
   166 00000166 52                  <1> 	push	dx
   167 00000167 51                  <1> 	push	cx
   168 00000168 E8FF00              <1> 	call	set_disk_parms
   169 0000016B 59                  <1> 	pop	cx
   170 0000016C 5A                  <1> 	pop	dx
   171                              <1> 	; 06/07/2016 (BugFix for >64K kernel files)
   172                              <1> 	; 04/02/2016 (esi -> si)
   173                              <1> 	;mov	si, _end ; 30 byte temporary buffer address 	
   174                              <1> 	;		 ; at the '_end' of kernel.
   175                              <1> 	;mov	word [si], 30
   176                              <1> 	; 06/07/2016
   177 0000016D BE[5000]            <1> 	mov	si, _int13h_48h_buffer
   178                              <1> 	; 09/07/2016
   179 00000170 B81E00              <1> 	mov	ax, 001Eh
   180 00000173 8824                <1> 	mov	[si], ah ; 0
   181 00000175 46                  <1> 	inc	si
   182 00000176 8904                <1> 	mov	word [si], ax
   183                              <1>  	; word [si] = 30
   184                              <1> 	;
   185 00000178 B448                <1> 	mov	ah, 48h	 ; Get drive parameters (EDD function)
   186 0000017A CD13                <1> 	int	13h
   187 0000017C 0F82DC00            <1>         jc      L13
   188                              <1> 	; 04/02/2016 (ebx -> bx)
   189                              <1> 	; 14/01/2015
   190 00000180 28FF                <1> 	sub	bh, bh
   191 00000182 88D3                <1> 	mov	bl, dl
   192 00000184 80EB80              <1> 	sub	bl, 80h
   193 00000187 81C3[585C]          <1> 	add	bx, hd0_type
   194 0000018B 8A07                <1> 	mov 	al, [bx]
   195 0000018D 0C80                <1> 	or	al, 80h
   196 0000018F 8807                <1> 	mov 	[bx], al	
   197 00000191 81EB[565C]          <1> 	sub	bx, hd0_type - 2 ; 15/01/2015
   198 00000195 81C3[A25C]          <1> 	add	bx, drv.status
   199 00000199 8807                <1> 	mov	[bx], al
   200                              <1> 	; 04/02/2016 (eax -> ax)
   201 0000019B 8B4410              <1> 	mov	ax, [si+16]
   202 0000019E 854412              <1> 	test	ax, [si+18]
   203 000001A1 7412                <1> 	jz	short L10_A0h 
   204                              <1> 			; 'CHS only' disks on EDD system 
   205                              <1> 			;  are reported with ZERO disk size
   206 000001A3 81EB[A25C]          <1> 	sub	bx, drv.status
   207 000001A7 C1E302              <1> 	shl	bx, 2
   208 000001AA 81C3[865C]          <1> 	add	bx, drv.size ; disk size (in sectors)
   209 000001AE 8907                <1> 	mov	[bx], ax
   210 000001B0 8B4412              <1> 	mov	ax, [si+18]
   211 000001B3 8907                <1> 	mov	[bx], ax
   212                              <1> 
   213                              <1> L10_A0h: ; Jump here to fix a ZERO (LBA) disk size problem 
   214                              <1> 	 ; for CHS disks (28/02/2015)
   215                              <1> 	; 30/12/2014
   216 000001B5 BF0000              <1> 	mov	di, HD0_DPT
   217 000001B8 88D0                <1> 	mov	al, dl
   218 000001BA 83E003              <1> 	and 	ax, 3
   219 000001BD C0E005              <1> 	shl	al, 5 ; *32
   220 000001C0 01C7                <1> 	add 	di, ax
   221 000001C2 B80090              <1> 	mov	ax, DPT_SEGM
   222 000001C5 8EC0                <1> 	mov	es, ax
   223                              <1> 	;
   224 000001C7 88E8                <1> 	mov	al, ch	; max. cylinder number (bits 0-7)
   225 000001C9 88CC                <1> 	mov	ah, cl	
   226 000001CB C0EC06              <1> 	shr	ah, 6	; max. cylinder number (bits 8-9)
   227 000001CE 40                  <1>  	inc	ax	; logical cylinders (limit 1024)
   228 000001CF AB                  <1> 	stosw		
   229 000001D0 88F0                <1> 	mov	al, dh	; max. head number
   230 000001D2 FEC0                <1> 	inc	al
   231 000001D4 AA                  <1> 	stosb		; logical heads (limits 256)
   232 000001D5 B0A0                <1> 	mov	al, 0A0h ; Indicates translated table
   233 000001D7 AA                  <1> 	stosb
   234 000001D8 8A440C              <1> 	mov	al, [si+12]
   235 000001DB AA                  <1> 	stosb		 ; physical sectors per track
   236 000001DC 31C0                <1>  	xor	ax, ax
   237                              <1> 	;dec	ax	 ; 02/01/2015 
   238 000001DE AB                  <1> 	stosw		 ; precompensation (obsolete)
   239                              <1> 	;xor	al, al	 ; 02/01/2015	
   240 000001DF AA                  <1> 	stosb		 ; reserved
   241 000001E0 B008                <1> 	mov	al, 8	 ; drive control byte
   242                              <1> 		         ; (do not disable retries, 
   243                              <1> 			 ; more than 8 heads)
   244 000001E2 AA                  <1> 	stosb
   245 000001E3 8B4404              <1> 	mov	ax, [si+4]
   246 000001E6 AB                  <1> 	stosw		 ; physical number of cylinders	
   247                              <1> 	;push	ax	 ; 02/01/2015
   248 000001E7 8A4408              <1> 	mov	al, [si+8]
   249 000001EA AA                  <1> 	stosb		 ; physical num. of heads (limit 16)
   250 000001EB 29C0                <1> 	sub 	ax, ax
   251                              <1> 	;pop	ax	 ; 02/01/2015	
   252 000001ED AB                  <1> 	stosw		 ; landing zone (obsolete)
   253 000001EE 88C8                <1> 	mov	al, cl	 ; logical sectors per track (limit 63)
   254 000001F0 243F                <1> 	and 	al, 3Fh	
   255 000001F2 AA                  <1> 	stosb
   256                              <1> 	;sub	al, al	 ; checksum
   257                              <1> 	;stosb
   258                              <1> 	;
   259 000001F3 83C61A              <1> 	add	si, 26   ; (BIOS) DPTE address pointer
   260 000001F6 AD                  <1> 	lodsw
   261 000001F7 50                  <1> 	push	ax	 ; (BIOS) DPTE offset
   262 000001F8 AD                  <1> 	lodsw
   263 000001F9 50                  <1> 	push	ax	 ; (BIOS) DPTE segment
   264                              <1> 	;
   265                              <1> 	; checksum calculation
   266 000001FA 89FE                <1> 	mov	si, di
   267 000001FC 06                  <1> 	push	es
   268 000001FD 1F                  <1> 	pop	ds
   269                              <1> 	;mov	cx, 16
   270 000001FE B90F00              <1> 	mov 	cx, 15
   271 00000201 29CE                <1> 	sub	si, cx
   272 00000203 30E4                <1> 	xor	ah, ah
   273                              <1> 	;del	cl
   274                              <1> L11:		
   275 00000205 AC                  <1> 	lodsb
   276 00000206 00C4                <1> 	add	ah, al
   277 00000208 E2FB                <1> 	loop	L11
   278                              <1> 	;
   279 0000020A 88E0                <1> 	mov	al, ah
   280 0000020C F6D8                <1> 	neg	al	; -x+x = 0
   281 0000020E AA                  <1> 	stosb		; put checksum in byte 15 of the tbl
   282                              <1> 	;
   283 0000020F 1F                  <1> 	pop	ds	; (BIOS) DPTE segment
   284 00000210 5E                  <1> 	pop	si	; (BIOS) DPTE offset	
   285                              <1> 	;
   286                              <1> 	; 23/02/2015
   287 00000211 57                  <1> 	push	di
   288                              <1> 	; ES:DI points to DPTE (FDPTE) location
   289                              <1> 	;mov	cx, 8
   290 00000212 B108                <1> 	mov	cl, 8
   291 00000214 F3A5                <1> 	rep	movsw	
   292                              <1> 	;
   293                              <1> 	; 23/02/2015
   294                              <1> 	; (P)ATA drive and LBA validation
   295                              <1> 	; (invalidating SATA drives and setting
   296                              <1> 	; CHS type I/O for old type fixed disks)
   297 00000216 5B                  <1> 	pop	bx
   298 00000217 8CC8                <1> 	mov	ax, cs
   299 00000219 8ED8                <1> 	mov	ds, ax
   300 0000021B 268B07              <1> 	mov	ax, [es:bx]
   301 0000021E 3DF001              <1> 	cmp	ax, 1F0h
   302 00000221 7418                <1> 	je	short L11a
   303 00000223 3D7001              <1> 	cmp	ax, 170h
   304 00000226 7413                <1> 	je	short L11a
   305                              <1> 	; invalidation 
   306                              <1> 	; (because base port address is not 1F0h or 170h)
   307 00000228 30FF                <1> 	xor	bh, bh
   308 0000022A 88D3                <1> 	mov	bl, dl
   309 0000022C 80EB80              <1> 	sub	bl, 80h
   310 0000022F C687[585C]00        <1> 	mov	byte [bx+hd0_type], 0 ; not a valid disk drive !		
   311 00000234 808F[A45C]F0        <1>         or      byte [bx+drv.status+2], 0F0h ; (failure sign)
   312 00000239 EB14                <1> 	jmp	short L11b
   313                              <1> L11a:	
   314                              <1> 	; LBA validation
   315 0000023B 268A4704            <1> 	mov	al, [es:bx+4] ; Head register upper nibble
   316 0000023F A840                <1> 	test	al, 40h ; LBA bit (bit 6)
   317 00000241 750C                <1> 	jnz	short L11b ; LBA type I/O is OK! (E0h or F0h)
   318                              <1> 	; force CHS type I/O for this drive (A0h or B0h)
   319 00000243 28FF                <1> 	sub	bh, bh
   320 00000245 88D3                <1> 	mov	bl, dl
   321 00000247 80EB80              <1> 	sub	bl, 80h ; 26/02/2015
   322 0000024A 80A7[A45C]FE        <1>         and     byte [bx+drv.status+2], 0FEh ; clear bit 0
   323                              <1> 				; bit 0 = LBA ready bit
   324                              <1> 	; 'diskio' procedure will check this bit !
   325                              <1> L11b:
   326 0000024F 3A16[545C]          <1> 	cmp	dl, [last_drv] ; 25/12/2014
   327 00000253 7307                <1>         jnb     short L13
   328 00000255 E9FCFE              <1>         jmp     L10
   329                              <1> L12:
   330                              <1> 	; Restore data registers
   331 00000258 8CC8                <1> 	mov	ax, cs
   332 0000025A 8ED8                <1> 	mov	ds, ax	
   333                              <1> L13:
   334                              <1> 	; 13/12/2014
   335 0000025C 0E                  <1> 	push	cs
   336 0000025D 07                  <1> 	pop	es
   337                              <1> L14:
   338 0000025E B411                <1> 	mov 	ah, 11h
   339 00000260 CD16                <1> 	int 	16h
   340 00000262 7466                <1> 	jz 	short L16 ; no keys in keyboard buffer
   341 00000264 B010                <1> 	mov	al, 10h
   342 00000266 CD16                <1> 	int 	16h
   343 00000268 EBF4                <1> 	jmp 	short L14
   344                              <1> 
   345                              <1> set_disk_parms:
   346                              <1> 	; 04/02/2016 (ebx -> bx)
   347                              <1> 	; 10/07/2015
   348                              <1> 	; 14/01/2015
   349                              <1> 	;push	bx
   350 0000026A 28FF                <1> 	sub	bh, bh
   351 0000026C 8A1E[535C]          <1> 	mov	bl, [drv]
   352 00000270 80FB80              <1> 	cmp	bl, 80h
   353 00000273 7203                <1> 	jb	short sdp0
   354 00000275 80EB7E              <1> 	sub	bl, 7Eh
   355                              <1> sdp0:	
   356 00000278 81C3[A25C]          <1> 	add	bx, drv.status
   357 0000027C C60780              <1>   	mov	byte [bx], 80h ; 'Present' flag
   358                              <1> 	;
   359 0000027F 88E8                <1> 	mov	al, ch ; last cylinder (bits 0-7)
   360 00000281 88CC                <1> 	mov	ah, cl ; 
   361 00000283 C0EC06              <1> 	shr	ah, 6  ; last cylinder (bits 8-9)
   362 00000286 81EB[A25C]          <1> 	sub	bx, drv.status
   363 0000028A D0E3                <1> 	shl	bl, 1
   364 0000028C 81C3[5C5C]          <1> 	add	bx, drv.cylinders
   365 00000290 40                  <1> 	inc	ax  ; convert max. cyl number to cyl count		
   366 00000291 8907                <1> 	mov	[bx], ax
   367 00000293 50                  <1> 	push	ax ; ** cylinders
   368 00000294 81EB[5C5C]          <1> 	sub	bx, drv.cylinders
   369 00000298 81C3[6A5C]          <1> 	add	bx, drv.heads
   370 0000029C 30E4                <1> 	xor	ah, ah
   371 0000029E 88F0                <1> 	mov	al, dh ; heads
   372 000002A0 40                  <1> 	inc	ax
   373 000002A1 8907                <1> 	mov	[bx], ax
   374 000002A3 81EB[6A5C]          <1>         sub     bx, drv.heads
   375 000002A7 81C3[785C]          <1>         add     bx, drv.spt
   376 000002AB 30ED                <1> 	xor	ch, ch
   377 000002AD 80E13F              <1> 	and	cl, 3Fh	; sectors (bits 0-6)
   378 000002B0 890F                <1> 	mov	[bx], cx
   379 000002B2 81EB[785C]          <1>         sub     bx, drv.spt
   380 000002B6 D1E3                <1> 	shl	bx, 1
   381 000002B8 81C3[865C]          <1> 	add	bx, drv.size ; disk size (in sectors)
   382                              <1> 	; LBA size = cylinders * heads * secpertrack
   383 000002BC F7E1                <1> 	mul	cx 
   384 000002BE 89C2                <1> 	mov	dx, ax	; heads*spt					
   385 000002C0 58                  <1> 	pop	ax ; ** cylinders
   386 000002C1 48                  <1> 	dec	ax ; 1 cylinder reserved (!?)
   387 000002C2 F7E2                <1> 	mul	dx ; cylinders * (heads*spt)		
   388 000002C4 8907                <1> 	mov	[bx], ax
   389 000002C6 895702              <1> 	mov	[bx+2], dx
   390                              <1> 	;
   391                              <1> 	;pop	bx
   392 000002C9 C3                  <1> 	retn
   393                              <1> 
   394                              <1> L16:	; 28/05/2016
   203                                  
   204                                  	; 10/11/2014
   205 000002CA FA                           	cli	; Disable interrupts (clear interrupt flag)
   206                                  		; Reset Interrupt MASK Registers (Master&Slave)
   207                                  	;mov	al, 0FFh	; mask off all interrupts
   208                                  	;out	21h, al		; on master PIC (8259)
   209                                  	;jmp 	$+2  ; (delay)
   210                                  	;out	0A1h, al	; on slave PIC (8259)
   211                                  	;
   212                                  	; Disable NMI 
   213 000002CB B080                    	mov   	al, 80h 
   214 000002CD E670                    	out   	70h, al		; set bit 7 to 1 for disabling NMI
   215                                  	;23/02/2015
   216                                  	;nop			;
   217                                  	;in	al, 71h		; read in 71h just after writing out to 70h
   218                                  				; for preventing unknown state (!?)
   219                                  	;
   220                                   	; 20/08/2014
   221                                  	; Moving the kernel 64 KB back (to physical address 0)
   222                                  	; DS = CS = 1000h
   223                                  	; 05/11/2014
   224 000002CF 31C0                    	xor	ax, ax
   225 000002D1 8EC0                    	mov	es, ax ; ES = 0
   226                                  	;
   227                                  	; 04/07/2016 -  TRDOS 386 (64K - 128K kernel)
   228 000002D3 31F6                          	xor	si, si
   229 000002D5 31FF                    	xor	di, di
   230 000002D7 B90040                  	mov	cx, 16384
   231 000002DA F366A5                  	rep	movsd
   232                                  	;
   233 000002DD 06                      	push	es ; 0
   234 000002DE 68[E202]                	push	L17
   235 000002E1 CB                      	retf
   236                                  L17:
   237 000002E2 B90010                  	mov	cx, 1000h
   238 000002E5 8EC1                    	mov	es, cx  ; 1000h 
   239 000002E7 01C9                    	add	cx, cx
   240 000002E9 8ED9                    	mov	ds, cx  ; 2000h
   241 000002EB 29F6                    	sub	si, si
   242 000002ED 29FF                    	sub	di, di
   243 000002EF B90040                  	mov	cx, 16384
   244 000002F2 F366A5                  	rep	movsd
   245                                  	
   246                                  	; Turn off the floppy drive motor
   247 000002F5 BAF203                          mov     dx, 3F2h
   248 000002F8 EE                              out     dx, al ; 0 ; 31/12/2013
   249                                  
   250                                  	; Enable access to memory above one megabyte
   251                                  L18:
   252 000002F9 E464                    	in	al, 64h
   253 000002FB A802                    	test	al, 2
   254 000002FD 75FA                            jnz     short L18
   255 000002FF B0D1                    	mov	al, 0D1h	; Write output port
   256 00000301 E664                    	out	64h, al
   257                                  L19:
   258 00000303 E464                    	in	al, 64h
   259 00000305 A802                    	test	al, 2
   260 00000307 75FA                            jnz     short L19
   261 00000309 B0DF                    	mov	al, 0DFh	; Enable A20 line
   262 0000030B E660                    	out	60h, al
   263                                  ;L20:
   264                                  	;
   265                                  	; Load global descriptor table register
   266                                  
   267                                          ;mov     ax, cs
   268                                          ;mov     ds, ax
   269                                  
   270 0000030D 2E0F0116[C05B]                  lgdt    [cs:gdtd]
   271                                  
   272 00000313 0F20C0                          mov     eax, cr0
   273                                  	; or 	eax, 1
   274 00000316 40                      	inc     ax
   275 00000317 0F22C0                  	mov     cr0, eax
   276                                  
   277                                  	; Jump to 32 bit code
   278                                  	
   279 0000031A 66                      	db 66h 			; Prefix for 32-bit
   280 0000031B EA                      	db 0EAh 		; Opcode for far jump
   281 0000031C [22030000]              	dd StartPM 		; Offset to start, 32-bit
   282                                  				; (1000h:StartPM = StartPM + 10000h)
   283 00000320 0800                    	dw KCODE		; This is the selector for CODE32_DESCRIPTOR,
   284                                  				; assuming that StartPM resides in code32
   285                                  
   286                                  ; 20/02/2017
   287                                  
   288                                  
   289                                  [BITS 32] 
   290                                  
   291                                  StartPM:
   292                                  	; Kernel Base Address = 0 ; 30/12/2013
   293 00000322 66B81000                	mov ax, KDATA           ; Save data segment identifier
   294 00000326 8ED8                            mov ds, ax              ; Move a valid data segment into DS register
   295 00000328 8EC0                           	mov es, ax              ; Move data segment into ES register
   296 0000032A 8EE0                           	mov fs, ax              ; Move data segment into FS register
   297 0000032C 8EE8                          	mov gs, ax              ; Move data segment into GS register
   298 0000032E 8ED0                            mov ss, ax              ; Move data segment into SS register
   299 00000330 BC00000900                      mov esp, 90000h         ; Move the stack pointer to 090000h
   300                                  
   301                                  clear_bss: ; Clear uninitialized data area
   302                                  	; 11/03/2015
   303 00000335 31C0                    	xor  eax, eax ; 0
   304 00000337 B9110B0000              	mov  ecx, (bss_end - bss_start)/4
   305                                  	;shr  ecx, 2 ; bss section is already aligned for double words
   306 0000033C BF[F23E0100]            	mov  edi, bss_start	
   307 00000341 F3AB                    	rep  stosd  		
   308                                  
   309                                  memory_init:
   310                                  	; Initialize memory allocation table and page tables
   311                                  	; 16/11/2014
   312                                  	; 15/11/2014
   313                                  	; 07/11/2014
   314                                  	; 06/11/2014
   315                                  	; 05/11/2014
   316                                  	; 04/11/2014
   317                                  	; 31/10/2014 (Retro UNIX 386 v1 - Beginning) 
   318                                  	;
   319                                  ;	xor	eax, eax
   320                                  ;	xor 	ecx, ecx
   321 00000343 B108                    	mov	cl, 8
   322 00000345 BF00001000              	mov	edi, MEM_ALLOC_TBL	
   323 0000034A F3AB                    	rep	stosd		   ; clear Memory Allocation Table
   324                                  				   ; for the first 1 MB memory
   325                                  	;
   326 0000034C 668B0D[4E5C0000]        	mov	cx, [mem_1m_1k]	   ; Number of contiguous KB between
   327                                  				   ; 1 and 16 MB, max. 3C00h = 15 MB.
   328 00000353 66C1E902                	shr	cx, 2		   ; convert 1 KB count to 4 KB count
   329 00000357 890D[E8410100]          	mov	[free_pages], ecx
   330 0000035D 668B15[505C0000]        	mov	dx, [mem_16m_64k]  ; Number of contiguous 64 KB blocks
   331                                  				   ; between 16 MB and 4 GB.	
   332 00000364 6609D2                  	or	dx, dx
   333 00000367 7413                    	jz	short mi_0
   334                                  	;
   335 00000369 6689D0                  	mov	ax, dx
   336 0000036C C1E004                  	shl	eax, 4		   ; 64 KB -> 4 KB (page count)
   337 0000036F 0105[E8410100]          	add	[free_pages], eax
   338 00000375 0500100000              	add	eax, 4096	   ; 16 MB = 4096 pages
   339 0000037A EB07                    	jmp	short mi_1
   340                                  mi_0:
   341 0000037C 6689C8                  	mov	ax, cx
   342 0000037F 66050001                	add	ax, 256		   ; add 256 pages for the first 1 MB		 
   343                                  mi_1:
   344 00000383 A3[E4410100]            	mov	[memory_size], eax ; Total available memory in pages
   345                                  				   ; 1 alloc. tbl. bit = 1 memory page
   346                                  				   ; 32 allocation bits = 32 mem. pages   
   347                                  	;
   348 00000388 05FF7F0000              	add	eax, 32767	   ; 32768 memory pages per 1 M.A.T. page 	
   349 0000038D C1E80F                  	shr	eax, 15		   ; ((32768 * x) + y) pages (y < 32768)
   350                                  				   ;  --> x + 1 M.A.T. pages, if y > 0
   351                                  				   ;  --> x M.A.T. pages, if y = 0
   352 00000390 66A3[F8410100]          	mov	[mat_size], ax	   ; Memory Alloc. Table Size in pages		
   353 00000396 C1E00C                  	shl	eax, 12		   ; 1 M.A.T. page = 4096 bytes
   354                                  	;			   ; Max. 32 M.A.T. pages (4 GB memory)
   355 00000399 89C3                    	mov	ebx, eax	   ; M.A.T. size in bytes
   356                                  	; Set/Calculate Kernel's Page Directory Address
   357 0000039B 81C300001000            	add	ebx, MEM_ALLOC_TBL
   358 000003A1 891D[E0410100]          	mov	[k_page_dir], ebx  ; Kernel's Page Directory address
   359                                  				   ; just after the last M.A.T. page
   360                                  	;
   361 000003A7 83E804                  	sub	eax, 4		   ; convert M.A.T. size to offset value
   362 000003AA A3[F0410100]            	mov	[last_page], eax   ; last page ofset in the M.A.T.
   363                                  	;			   ; (allocation status search must be 
   364                                  				   ; stopped after here)	
   365 000003AF 31C0                    	xor	eax, eax
   366 000003B1 48                      	dec	eax		   ; FFFFFFFFh (set all bits to 1)	
   367 000003B2 6651                    	push	cx
   368 000003B4 C1E905                  	shr	ecx, 5		   ; convert 1 - 16 MB page count to 
   369                                  				   ; count of 32 allocation bits
   370 000003B7 F3AB                    	rep	stosd
   371 000003B9 6659                    	pop	cx
   372 000003BB 40                      	inc	eax		   ; 0	
   373 000003BC 80E11F                  	and	cl, 31		   ; remain bits
   374 000003BF 7412                    	jz	short mi_4
   375 000003C1 8907                    	mov	[edi], eax	   ; reset	
   376                                  mi_2:
   377 000003C3 0FAB07                  	bts	[edi], eax	   ; 06/11/2014		
   378 000003C6 FEC9                    	dec	cl
   379 000003C8 7404                    	jz	short mi_3
   380 000003CA FEC0                    	inc	al
   381 000003CC EBF5                    	jmp	short mi_2
   382                                  mi_3:
   383 000003CE 28C0                    	sub	al, al	   	   ; 0
   384 000003D0 83C704                  	add	edi, 4		   ; 15/11/2014
   385                                  mi_4:
   386 000003D3 6609D2                  	or	dx, dx		  ; check 16M to 4G memory space	
   387 000003D6 7421                    	jz	short mi_6	  ; max. 16 MB memory, no more...
   388                                  	;	
   389 000003D8 B900021000              	mov	ecx, MEM_ALLOC_TBL + 512 ; End of first 16 MB memory
   390                                  	;	
   391 000003DD 29F9                    	sub	ecx, edi	  ; displacement (to end of 16 MB)
   392 000003DF 7406                    	jz	short mi_5	  ; jump if EDI points to 
   393                                  				  ;         end of first 16 MB	
   394 000003E1 D1E9                    	shr	ecx, 1		  ; convert to dword count
   395 000003E3 D1E9                    	shr	ecx, 1		  ; (shift 2 bits right) 
   396 000003E5 F3AB                    	rep 	stosd		  ; reset all bits for reserved pages
   397                                  				  ; (memory hole under 16 MB)
   398                                  mi_5:
   399 000003E7 6689D1                  	mov	cx, dx		  ; count of 64 KB memory blocks
   400 000003EA D1E9                    	shr	ecx, 1		  ; 1 alloc. dword per 128 KB memory
   401 000003EC 9C                      	pushf			  ; 16/11/2014		
   402 000003ED 48                      	dec	eax		  ; FFFFFFFFh (set all bits to 1)
   403 000003EE F3AB                    	rep	stosd
   404 000003F0 40                      	inc	eax		  ; 0
   405 000003F1 9D                      	popf			  ; 16/11/2014
   406 000003F2 7305                    	jnc	short mi_6
   407 000003F4 6648                    	dec	ax		  ; eax = 0000FFFFh
   408 000003F6 AB                      	stosd
   409 000003F7 6640                    	inc	ax		  ; 0		
   410                                  mi_6:
   411 000003F9 39DF                    	cmp	edi, ebx	  ; check if EDI points to 	
   412 000003FB 730A                    	jnb	short mi_7	  ; end of memory allocation table
   413                                  	;			  ; (>= MEM_ALLOC_TBL + 4906) 
   414 000003FD 89D9                    	mov	ecx, ebx	  ; end of memory allocation table
   415 000003FF 29F9                    	sub	ecx, edi	  ; convert displacement/offset
   416 00000401 D1E9                    	shr	ecx, 1		  ; to dword count 	 		
   417 00000403 D1E9                    	shr	ecx, 1		  ; (shift 2 bits right) 
   418 00000405 F3AB                    	rep 	stosd		  ; reset all remain M.A.T. bits
   419                                  mi_7:
   420                                  	; Reset M.A.T. bits in M.A.T. (allocate M.A.T. pages)
   421 00000407 BA00001000              	mov	edx, MEM_ALLOC_TBL
   422                                  	;sub	ebx, edx	  ; Mem. Alloc. Tbl. size in bytes
   423                                  	;shr	ebx, 12		  ; Mem. Alloc. Tbl. size in pages	
   424 0000040C 668B0D[F8410100]        	mov	cx, [mat_size]	  ; Mem. Alloc. Tbl. size in pages
   425 00000413 89D7                    	mov	edi, edx
   426 00000415 C1EF0F                  	shr	edi, 15		  ; convert M.A.T. address to
   427                                  				  ; byte offset in M.A.T.
   428                                  				  ; (1 M.A.T. byte points to 
   429                                  				  ;	      32768 bytes)
   430                                  				  ; Note: MEM_ALLOC_TBL address 
   431                                  				  ; must be aligned on 128 KB 
   432                                  				  ; boundary!
   433 00000418 01D7                    	add	edi, edx	  ; points to M.A.T.'s itself	
   434                                  	; eax = 0
   435 0000041A 290D[E8410100]          	sub	[free_pages], ecx ; 07/11/2014
   436                                  mi_8:
   437 00000420 0FB307                  	btr	[edi], eax	  ; clear bit 0 to bit x (1 to 31)
   438                                  	;dec	bl
   439 00000423 FEC9                    	dec	cl
   440 00000425 7404                    	jz	short mi_9
   441 00000427 FEC0                    	inc	al
   442 00000429 EBF5                    	jmp	short mi_8
   443                                  mi_9:
   444                                  	;
   445                                  	; Reset Kernel's Page Dir. and Page Table bits in M.A.T.
   446                                  	;		(allocate pages for system page tables)
   447                                  
   448                                  	; edx = MEM_ALLOC_TBL
   449 0000042B 8B0D[E4410100]          	mov	ecx, [memory_size] ; memory size in pages (PTEs)
   450 00000431 81C1FF030000            	add	ecx, 1023	 ; round up (1024 PTEs per table)	 	
   451 00000437 C1E90A                  	shr	ecx, 10		 ; convert memory page count to 
   452                                  				 ; page table count (PDE count)
   453                                  	;
   454 0000043A 51                      	push	ecx		 ; (**) PDE count (<= 1024)
   455                                  	;
   456 0000043B 41                      	inc	ecx		 ; +1 for kernel page directory	
   457                                  	;
   458 0000043C 290D[E8410100]          	sub	[free_pages], ecx ; 07/11/2014
   459                                  	;
   460 00000442 8B35[E0410100]          	mov	esi, [k_page_dir] ; Kernel's Page Directory address
   461 00000448 C1EE0C                  	shr	esi, 12		 ; convert to page number
   462                                  mi_10:
   463 0000044B 89F0                    	mov	eax, esi	 ; allocation bit offset		 
   464 0000044D 89C3                    	mov	ebx, eax
   465 0000044F C1EB03                  	shr	ebx, 3		 ; convert to alloc. byte offset
   466 00000452 80E3FC                  	and	bl,  0FCh	 ; clear bit 0 and bit 1
   467                                  				 ;   to align on dword boundary
   468 00000455 83E01F                  	and	eax, 31		 ; set allocation bit position 
   469                                  				 ;  (bit 0 to bit 31)
   470                                  	;
   471 00000458 01D3                    	add	ebx, edx	 ; offset in M.A.T. + M.A.T. address 
   472                                  	;
   473 0000045A 0FB303                  	btr 	[ebx], eax	 ; reset relevant bit (0 to 31)
   474                                  	;
   475 0000045D 46                      	inc	esi		 ; next page table
   476 0000045E E2EB                    	loop	mi_10		 ; allocate next kernel page table 
   477                                  				 ; (ecx = page table count + 1)		
   478                                  	;
   479 00000460 59                      	pop	ecx		 ; (**) PDE count (= pg. tbl. count)
   480                                  	;
   481                                  	; Initialize Kernel Page Directory and Kernel Page Tables
   482                                  	;
   483                                  	; Initialize Kernel's Page Directory
   484 00000461 8B3D[E0410100]          	mov	edi, [k_page_dir]
   485 00000467 89F8                    	mov	eax, edi
   486 00000469 0C03                    	or	al, PDE_A_PRESENT + PDE_A_WRITE
   487                                  		     	      ; supervisor + read&write + present
   488 0000046B 89CA                    	mov	edx, ecx 	; (**) PDE count (= pg. tbl. count)	
   489                                  mi_11:
   490 0000046D 0500100000              	add	eax, 4096	; Add page size (PGSZ)
   491                                  			        ; EAX points to next page table
   492 00000472 AB                      	stosd
   493 00000473 E2F8                    	loop	mi_11
   494 00000475 29C0                    	sub	eax, eax	; Empty PDE
   495 00000477 66B90004                	mov	cx, 1024	; Entry count (PGSZ/4)
   496 0000047B 29D1                    	sub	ecx, edx
   497 0000047D 7402                    	jz	short mi_12
   498 0000047F F3AB                    	rep	stosd 		; clear remain (empty) PDEs
   499                                  	;
   500                                  	; Initialization of Kernel's Page Directory is OK, here.
   501                                  mi_12:
   502                                  	; Initialize Kernel's Page Tables
   503                                  	;
   504                                  	; (EDI points to address of page table 0)
   505                                  	; eax = 0
   506 00000481 8B0D[E4410100]          	mov	ecx, [memory_size] ; memory size in pages
   507 00000487 89CA                    	mov	edx, ecx	; (***)
   508 00000489 B003                    	mov	al, PTE_A_PRESENT + PTE_A_WRITE
   509                                  			     ; supervisor + read&write + present 	
   510                                  mi_13:
   511 0000048B AB                      	stosd
   512 0000048C 0500100000              	add	eax, 4096	
   513 00000491 E2F8                    	loop	mi_13	
   514 00000493 6681E2FF03              	and	dx, 1023	; (***)
   515 00000498 740B                    	jz	short mi_14
   516 0000049A 66B90004                	mov	cx, 1024	
   517 0000049E 6629D1                  	sub	cx, dx		; from dx (<= 1023) to 1024
   518 000004A1 31C0                    	xor	eax, eax
   519 000004A3 F3AB                    	rep	stosd		; clear remain (empty) PTEs 
   520                                  				; of the last page table
   521                                  mi_14:
   522                                  	;  Initialization of Kernel's Page Tables is OK, here.
   523                                  	;
   524 000004A5 89F8                    	mov	eax, edi	; end of the last page table page
   525                                  			        ; (beginging of user space pages)
   526 000004A7 C1E80F                  	shr	eax, 15		; convert to M.A.T. byte offset
   527 000004AA 24FC                    	and	al, 0FCh	; clear bit 0 and bit 1 for
   528                                  				; aligning on dword boundary	
   529                                  	 
   530 000004AC A3[F4410100]            	mov	[first_page], eax
   531 000004B1 A3[EC410100]            	mov	[next_page], eax ; The first free page pointer
   532                                  				 ; for user programs
   533                                  				 ; (Offset in Mem. Alloc. Tbl.)	
   534                                  	;
   535                                  	; Linear/FLAT (1 to 1) memory paging for the kernel is OK, here.
   536                                  	;
   537                                  	
   538                                  	; Enable paging
   539                                  	;
   540 000004B6 A1[E0410100]                    mov     eax, [k_page_dir]
   541 000004BB 0F22D8                  	mov	cr3, eax
   542 000004BE 0F20C0                  	mov	eax, cr0
   543 000004C1 0D00000080              	or	eax, 80000000h	; set paging bit (bit 31)
   544 000004C6 0F22C0                  	mov	cr0, eax
   545                                          ;jmp    KCODE:StartPMP
   546                                  
   547 000004C9 EA                      	db 0EAh 		; Opcode for far jump
   548 000004CA [D0040000]                      dd StartPMP		; 32 bit offset
   549 000004CE 0800                    	dw KCODE		; kernel code segment descriptor
   550                                  
   551                                  
   552                                  StartPMP:
   553                                  	; 06/11//2014
   554                                  	; Clear video page 0
   555                                  	;
   556                                  	; Temporary Code
   557                                  	;
   558 000004D0 B9E8030000              	mov	ecx, 80*25/2
   559 000004D5 BF00800B00              	mov	edi, 0B8000h
   560                                  	; 30/01/2016
   561                                  	;xor	eax, eax	; black background, black fore color
   562 000004DA B800070007              	mov	eax, 07000700h  ; black background, light gray fore color
   563 000004DF F3AB                    	rep	stosd
   564                                  	
   565                                  	; 19/08/2014
   566                                  	; Kernel Base Address = 0
   567                                  	; It is mapped to (physically) 0 in the page table.
   568                                  	; So, here is exactly 'StartPMP' address.
   569                                  
   570                                   	; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
   571 000004E1 BE[6D0B0100]            	mov	esi, starting_msg
   572                                  	;; 14/08/2015 (kernel version message will appear
   573                                  	;;	       when protected mode and paging is enabled)
   574 000004E6 BF00800B00              	mov	edi, 0B8000h ; 27/08/2014
   575 000004EB B40A                    	mov	ah, 0Ah ; Black background, light green forecolor
   576                                  	; 20/08/2014
   577 000004ED E88F010000              	call	printk
   578                                  
   579                                  	; 'UNIX v7/x86' source code by Robert Nordier (1999)
   580                                  	; // Set IRQ offsets
   581                                  	;
   582                                  	;  Linux (v0.12) source code by Linus Torvalds (1991)
   583                                  	;
   584                                  					;; ICW1
   585 000004F2 B011                    	mov	al, 11h			; Initialization sequence
   586 000004F4 E620                    	out	20h, al			; 	8259A-1
   587                                  	; jmp 	$+2
   588 000004F6 E6A0                    	out	0A0h, al		; 	8259A-2
   589                                  					;; ICW2
   590 000004F8 B020                    	mov	al, 20h			; Start of hardware ints (20h)
   591 000004FA E621                    	out	21h, al			;	for 8259A-1
   592                                  	; jmp 	$+2
   593 000004FC B028                    	mov	al, 28h			; Start of hardware ints (28h)
   594 000004FE E6A1                    	out	0A1h, al		; 	for 8259A-2
   595                                  					;
   596 00000500 B004                    	mov	al, 04h			;; ICW3
   597 00000502 E621                    	out	21h, al			; 	IRQ2 of 8259A-1 (master)
   598                                  	; jmp 	$+2
   599 00000504 B002                    	mov	al, 02h			; 	is 8259A-2 (slave)
   600 00000506 E6A1                    	out	0A1h, al		;
   601                                  					;; ICW4
   602 00000508 B001                    	mov	al, 01h	 		;
   603 0000050A E621                    	out	21h, al			; 	8086 mode, normal EOI	
   604                                  	; jmp 	$+2
   605 0000050C E6A1                    	out	0A1h, al		;	for both chips.
   606                                  
   607                                  	;mov	al, 0FFh	; mask off all interrupts for now
   608                                  	;out	21h, al
   609                                  	;; jmp 	$+2
   610                                  	;out	0A1h, al
   611                                  
   612                                  	; 02/04/2015
   613                                  	; 26/03/2015 System call (INT 30h) modification
   614                                  	;  DPL = 3 (Interrupt service routine can be called from user mode)			
   615                                  	;
   616                                  	;; Linux (v0.12) source code by Linus Torvalds (1991)
   617                                  	;  setup_idt:
   618                                  	;
   619                                          ;; 16/02/2015
   620                                  	;;mov     dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
   621                                  	; 21/08/2014 (timer_int)
   622 0000050E BE[30080100]            	mov	esi, ilist
   623 00000513 8D3D[F83E0100]          	lea	edi, [idt]
   624                                  	; 26/03/2015
   625 00000519 B930000000              	mov	ecx, 48		; 48 hardware interrupts (INT 0 to INT 2Fh)
   626                                  	; 02/04/2015
   627 0000051E BB00000800              	mov	ebx,  80000h
   628                                  rp_sidt1:
   629 00000523 AD                      	lodsd
   630 00000524 89C2                    	mov	edx, eax
   631 00000526 66BA008E                	mov	dx, 8E00h
   632 0000052A 6689C3                  	mov	bx, ax
   633 0000052D 89D8                    	mov	eax, ebx	; /* selector = 0x0008 = cs */
   634                                         			        ; /* interrupt gate - dpl=0, present */
   635 0000052F AB                      	stosd	; selector & offset bits 0-15 	
   636 00000530 89D0                    	mov	eax, edx
   637 00000532 AB                      	stosd	; attributes & offset bits 16-23
   638 00000533 E2EE                    	loop	rp_sidt1
   639                                  	; 15/04/2016
   640                                  	; TRDOS 386 (TRDOS v2.0) /// 32 sofware interrupts ///
   641                                  	;mov	cl, 16        ; 16 software interrupts (INT 30h to INT 3Fh)
   642 00000535 B120                    	mov	cl, 32	      ; 32 software interrupts (INT 30h to INT 4Fh)	
   643                                  rp_sidt2:
   644 00000537 AD                      	lodsd
   645 00000538 21C0                    	and	eax, eax
   646 0000053A 7413                    	jz	short rp_sidt3
   647 0000053C 89C2                    	mov	edx, eax
   648 0000053E 66BA00EE                	mov	dx, 0EE00h	; P=1b/DPL=11b/01110b
   649 00000542 6689C3                  	mov	bx, ax
   650 00000545 89D8                    	mov	eax, ebx	; selector & offset bits 0-15 	
   651 00000547 AB                      	stosd
   652 00000548 89D0                    	mov	eax, edx
   653 0000054A AB                      	stosd
   654 0000054B E2EA                    	loop	rp_sidt2
   655 0000054D EB16                    	jmp	short sidt_OK
   656                                  rp_sidt3:
   657 0000054F B8[AA0A0000]            	mov	eax, ignore_int
   658 00000554 89C2                    	mov	edx, eax
   659 00000556 66BA00EE                	mov	dx, 0EE00h	; P=1b/DPL=11b/01110b
   660 0000055A 6689C3                  	mov	bx, ax
   661 0000055D 89D8                    	mov	eax, ebx	; selector & offset bits 0-15 	
   662                                  rp_sidt4:
   663 0000055F AB                      	stosd
   664 00000560 92                      	xchg	eax, edx
   665 00000561 AB                      	stosd
   666 00000562 92                      	xchg	edx, eax
   667 00000563 E2FA                    	loop	rp_sidt4
   668                                  sidt_OK: 
   669 00000565 0F011D[C65B0000]        	lidt 	[idtd]
   670                                  	;
   671                                  	; TSS descriptor setup ; 24/03/2015
   672 0000056C B8[78410100]            	mov	eax, task_state_segment
   673 00000571 66A3[BA5B0000]          	mov	[gdt_tss0], ax
   674 00000577 C1C010                  	rol	eax, 16
   675 0000057A A2[BC5B0000]            	mov	[gdt_tss1], al
   676 0000057F 8825[BF5B0000]          	mov	[gdt_tss2], ah
   677 00000585 66C705[DE410100]68-     	mov	word [tss.IOPB], tss_end - task_state_segment
   677 0000058D 00                 
   678                                  		; 
   679                                  		; IO Map Base address (When this address points
   680                                  		; to end of the TSS, CPU does not use IO port 
   681                                  		; permission bit map for RING 3 IO permissions, 
   682                                  		; access to any IO ports in ring 3 will be forbidden.)
   683                                   		;
   684                                  	;mov	[tss.esp0], esp ; TSS offset 4
   685                                  	;mov	word [tss.ss0], KDATA ; TSS offset 8 (SS)
   686 0000058E 66B82800                   	mov	ax, TSS  ; It is needed when an interrupt 
   687                                  			 ; occurs (or a system call -software INT- is requested)
   688                                  			 ; while cpu running in ring 3 (in user mode).				
   689                                  			 ; (Kernel stack pointer and segment will be loaded
   690                                  			 ; from offset 4 and 8 of the TSS, by the CPU.)	 
   691 00000592 0F00D8                  	ltr	ax  ; Load task register
   692                                  	;
   693                                  esp0_set0:
   694                                  	; 30/07/2015
   695 00000595 8B0D[E4410100]          	mov 	ecx, [memory_size] ; memory size in pages
   696 0000059B C1E10C                  	shl 	ecx, 12 ; convert page count to byte count
   697 0000059E 81F900004000            	cmp	ecx, CORE ; beginning of user's memory space (400000h)
   698                                  			  ; (kernel mode virtual address)
   699 000005A4 7605                    	jna	short esp0_set1
   700                                  	;
   701                                  	; If available memory > CORE (end of the 1st 4 MB)
   702                                  	; set stack pointer to CORE
   703                                  	;(Because, PDE 0 is reserved for kernel space in user's page directory)
   704                                  	;(PDE 0 points to page table of the 1st 4 MB virtual address space)
   705 000005A6 B900004000              	mov	ecx, CORE
   706                                  esp0_set1:
   707 000005AB 89CC                    	mov	esp, ecx ; top of kernel stack (**tss.esp0**)
   708                                  esp0_set_ok:
   709                                  	; 30/07/2015 (**tss.esp0**) 
   710 000005AD 8925[7C410100]          	mov	[tss.esp0], esp
   711 000005B3 66C705[80410100]10-             mov     word [tss.ss0], KDATA
   711 000005BB 00                 
   712                                  	; 14/08/2015
   713                                  	; 10/11/2014 (Retro UNIX 386 v1 - Erdogan Tan)
   714                                  	;
   715                                  	;cli	; Disable interrupts (for CPU)
   716                                  	;    (CPU will not handle hardware interrupts, except NMI!)
   717                                  	;
   718 000005BC 30C0                    	xor	al, al		; Enable all hardware interrupts!
   719 000005BE E621                    	out	21h, al		; (IBM PC-AT compatibility)
   720 000005C0 EB00                    	jmp 	$+2		; (All conventional PC-AT hardware
   721 000005C2 E6A1                    	out	0A1h, al	;  interrupts will be in use.)	
   722                                  				; (Even if related hardware component
   723                                  				;  does not exist!)
   724                                  	; Enable NMI 
   725 000005C4 B07F                    	mov	al, 7Fh		; Clear bit 7 to enable NMI (again)
   726 000005C6 E670                    	out  	70h, al
   727                                  	; 23/02/2015
   728 000005C8 90                      	nop
   729 000005C9 E471                    	in	al, 71h		; read in 71h just after writing out to 70h
   730                                  				; for preventing unknown state (!?)
   731                                  	;
   732                                  	; Only a NMI can occur here... (Before a 'STI' instruction)
   733                                  	;
   734                                  	; 02/09/2014
   735 000005CB 6631DB                  	xor	bx, bx
   736 000005CE 66BA0002                	mov	dx, 0200h	; Row 2, column 0  ; 07/03/2015
   737 000005D2 E871170000              	call	_set_cpos	; 24/01/2016
   738                                  	;
   739                                  	; 06/11/2014
   740 000005D7 E8782C0000              	call	memory_info
   741                                  	; 14/08/2015
   742                                  	;call getch ; 28/02/2015
   743                                  drv_init:
   744 000005DC FB                      	sti	; Enable Interrupts 
   745                                  	; 06/02/2015
   746 000005DD 8B15[585C0000]          	mov	edx, [hd0_type] ; hd0, hd1, hd2, hd3
   747 000005E3 668B1D[565C0000]        	mov	bx, [fd0_type] ; fd0, fd1
   748                                  	; 22/02/2015
   749 000005EA 6621DB                  	and	bx, bx
   750 000005ED 751C                    	jnz	short di1
   751                                  	;
   752 000005EF 09D2                    	or 	edx, edx
   753 000005F1 752A                    	jnz	short di2
   754                                  	;
   755                                  setup_error:
   756 000005F3 BE[360B0100]            	mov 	esi, setup_error_msg
   757                                  psem:	
   758 000005F8 AC                      	lodsb
   759 000005F9 08C0                    	or	al, al
   760                                  	;jz	short haltx ; 22/02/2015
   761 000005FB 7427                    	jz	short di3
   762 000005FD 56                      	push	esi
   763                                  	; 13/05/2016
   764 000005FE BB07000000              	mov	ebx, 7	; Black background, 
   765                                  			; light gray forecolor
   766                                  			; Video page 0 (BH=0)
   767 00000603 E8AA160000              	call	_write_tty
   768 00000608 5E                      	pop	esi
   769 00000609 EBED                    	jmp	short psem
   770                                  
   771                                  di1:
   772                                  	; supress 'jmp short T6'
   773                                  	;  (activate fdc motor control code)
   774 0000060B 66C705[EB060000]90-     	mov	word [T5], 9090h ; nop
   774 00000613 90                 
   775                                  	;
   776                                  	;mov	ax, int_0Eh	; IRQ 6 handler
   777                                  	;mov	di, 0Eh*4	; IRQ 6 vector
   778                                  	;stosw
   779                                  	;mov 	ax, cs
   780                                  	;stosw
   781                                  	;; 16/02/2015
   782                                          ;;mov     dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
   783                                  	;
   784 00000614 E8AF3B0000              	CALL	DSKETTE_SETUP	; Initialize Floppy Disks
   785                                  	;
   786 00000619 09D2                    	or	edx, edx
   787 0000061B 7407                            jz      short di3
   788                                  di2:
   789 0000061D E8EC3B0000              	call   	DISK_SETUP	; Initialize Fixed Disks
   790 00000622 72CF                            jc      short setup_error
   791                                  di3:
   792 00000624 E8FF2B0000              	call	setup_rtc_int	; 22/05/2015 (dsectrpm.s)
   793                                  	;
   794 00000629 E89E030100              	call	display_disks ; 07/03/2015  (Temporary)
   795                                  ;haltx:
   796                                  	; 14/08/2015
   797                                  	;call	getch ; 22/02/2015
   798                                  	;sti	; Enable interrupts (for CPU)
   799                                  ;	; 29/01/2016
   800                                  ;	sub	ah, ah ;  read time count
   801                                  ;	call	int1Ah
   802                                  ;	mov	edx, ecx ; 18.2 * seconds
   803                                  ;md_info_msg_wait1:
   804                                  ;	; 29/01/2016
   805                                  ;	mov	ah, 1
   806                                  ;	call	int16h
   807                                  ;	jz	short md_info_msg_wait2
   808                                  ;	xor	ah, ah ; 0
   809                                  ;       call    int16h
   810                                  ;	jmp 	short md_info_msg_ok
   811                                  ;md_info_msg_wait2:
   812                                  ;	sub	ah, ah  ; read time count
   813                                  ;	call	int1Ah
   814                                  ;	cmp	edx, ecx ; ; 18.2 * seconds
   815                                  ;	jna	short md_info_msg_wait3
   816                                  ;	xchg 	edx, ecx	
   817                                  ;md_info_msg_wait3:
   818                                  ;	sub	ecx, edx
   819                                  ;	cmp	ecx, 127 ; 7 seconds (18.2 * 7)
   820                                  ;	jb	short md_info_msg_wait1		
   821                                  ;md_info_msg_ok:
   822                                  	; 08/09/2016
   823 0000062E 0F20C0                  	mov	eax, cr0
   824 00000631 A810                    	test	al, 10h  ; Bit 4, ET (Extension Type)
   825 00000633 7408                    	jz	short sysinit
   826                                  	; 27/02/2017
   827 00000635 FE05[A04F0100]          	inc	byte [fpready]
   828                                  	; 80387 (FPU) is ready
   829 0000063B DBE3                    	fninit ; Initialize Floating-Point Unit
   830                                  sysinit:
   831                                  	; 30/06/2015
   832 0000063D E86C5B0000              	call	sys_init
   833                                  	;
   834                                  	;jmp 	cpu_reset ; 22/02/2015
   835                                  hang:  
   836                                  	; 23/02/2015
   837                                  	;sti			; Enable interrupts
   838 00000642 F4                      	hlt
   839                                  	;
   840                                  	;nop
   841                                  	;; 03/12/2014
   842                                  	;; 28/08/2014
   843                                  	;mov	ah, 11h
   844                                  	;call	getc
   845                                  	;jz      _c8
   846                                  	;
   847                                  	; 23/02/2015
   848                                  	; 06/02/2015
   849                                  	; 07/09/2014
   850 00000643 31DB                    	xor	ebx, ebx
   851 00000645 8A1D[0E420100]          	mov	bl, [ptty]	; active_page
   852 0000064B 89DE                    	mov	esi, ebx
   853 0000064D 66D1E6                  	shl 	si, 1
   854 00000650 81C6[10420100]          	add	esi, ttychr
   855 00000656 668B06                  	mov	ax, [esi]
   856 00000659 6621C0                  	and	ax, ax
   857                                  	;jz	short _c8
   858 0000065C 74E4                    	jz	short hang
   859 0000065E 66C7060000              	mov	word [esi], 0
   860 00000663 80FB03                  	cmp	bl, 3		; Video page 3
   861                                  	;jb	short _c8
   862 00000666 72DA                    	jb	short hang
   863                                  	;	
   864                                  	; 13/05/2016
   865                                  	; 07/09/2014
   866                                  nxtl:
   867 00000668 6653                    	push	bx
   868 0000066A 66BB0E00                	mov	bx, 0Eh 	; Yellow character 
   869                                  				; on black background
   870                                  				; bh = 0 (video page 0)
   871                                  				; Retro UNIX 386 v1 - Video Mode 0
   872                                  				; (PC/AT Video Mode 3 - 80x25 Alpha.)
   873 0000066E 6650                    	push	ax
   874 00000670 E83D160000              	call 	_write_tty
   875 00000675 6658                    	pop	ax
   876 00000677 665B                    	pop	bx
   877 00000679 3C0D                    	cmp	al, 0Dh		; carriage return (enter)
   878                                  	;jne	short _c8
   879 0000067B 75C5                    	jne	short hang
   880 0000067D B00A                    	mov	al, 0Ah		; next line
   881 0000067F EBE7                    	jmp	short nxtl
   882                                  	
   883                                  ;_c8:
   884                                  ;	; 25/08/2014
   885                                  ;	cli				; Disable interrupts
   886                                  ;	mov	al, [scounter + 1]
   887                                  ;	and	al, al
   888                                  ;	jnz	hang
   889                                  ;	call	rtc_p
   890                                  ;	jmp     hang
   891                                  
   892                                  
   893                                  	; 27/08/2014
   894                                  	; 20/08/2014
   895                                  printk:
   896                                          ;mov    edi, [scr_row]
   897                                  pkl:
   898 00000681 AC                      	lodsb
   899 00000682 08C0                    	or 	al, al
   900 00000684 7404                    	jz	short pkr
   901 00000686 66AB                    	stosw
   902 00000688 EBF7                    	jmp	short pkl
   903                                  pkr:
   904 0000068A C3                      	retn
   905                                  
   906                                  ; 28/02/2017
   907                                  ; 22/01/2017
   908                                  ; 15/01/2017
   909                                  ; 14/01/2017
   910                                  ; 02/01/2017
   911                                  ; 25/12/2016
   912                                  ; 19/12/2016
   913                                  ; 10/12/2016 (callback)
   914                                  ; 06/06/2016
   915                                  ; 23/05/2016
   916                                  ; 22/05/2016 - TRDOS 386 (TRDOS v2.0) Timer Event Modifications
   917                                  ; 25/07/2015
   918                                  ; 14/05/2015 (multi tasking -time sharing- 'clock', x_timer)
   919                                  ; 17/02/2015
   920                                  ; 06/02/2015 (unix386.s)
   921                                  ; 11/12/2014 - 22/12/2014 (dsectrm2.s) 
   922                                  ;
   923                                  ; IBM PC-XT Model 286 Source Code - BIOS2.ASM (06/10/85)
   924                                  ;
   925                                  ;-- HARDWARE INT  08 H - ( IRQ LEVEL 0 ) ---------------------------------------
   926                                  ;	THIS ROUTINE HANDLES THE TIMER INTERRUPT FROM FROM CHANNEL 0 OF        :
   927                                  ;	THE 8254 TIMER.  INPUT FREQUENCY IS 1.19318 MHZ AND THE DIVISOR        :
   928                                  ;	IS 65536, RESULTING IN APPROXIMATELY 18.2 INTERRUPTS EVERY SECOND.     :
   929                                  ;									       :
   930                                  ;	THE INTERRUPT HANDLER MAINTAINS A COUNT (40:6C) OF INTERRUPTS SINCE    :
   931                                  ;	POWER ON TIME, WHICH MAY BE USED TO ESTABLISH TIME OF DAY.	       :
   932                                  ;	THE INTERRUPT HANDLER ALSO DECREMENTS THE MOTOR CONTROL COUNT (40:40)  :
   933                                  ;	OF THE DISKETTE, AND WHEN IT EXPIRES, WILL TURN OFF THE 	       :
   934                                  ;	DISKETTE MOTOR(s), AND RESET THE MOTOR RUNNING FLAGS.		       :
   935                                  ;	THE INTERRUPT HANDLER WILL ALSO INVOKE A USER ROUTINE THROUGH	       :
   936                                  ;	INTERRUPT 1CH AT EVERY TIME TICK.  THE USER MUST CODE A 	       :
   937                                  ;	ROUTINE AND PLACE THE CORRECT ADDRESS IN THE VECTOR TABLE.	       :
   938                                  ;-------------------------------------------------------------------------------
   939                                  ;
   940                                  
   941                                  timer_int:	; IRQ 0
   942                                  ;int_08h:	; Timer
   943                                  	; 14/10/2015
   944                                  	; Here, we are simulating system call entry (for task switch)
   945                                  	; (If multitasking is enabled, 
   946                                  	; 'clock' procedure may jump to 'sysrelease')
   947                                  
   948 0000068B 1E                      	push	ds
   949 0000068C 06                      	push	es
   950 0000068D 0FA0                    	push	fs
   951 0000068F 0FA8                    	push	gs
   952                                  
   953 00000691 60                      	pushad	; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
   954 00000692 66B91000                	mov     cx, KDATA
   955 00000696 8ED9                            mov     ds, cx
   956 00000698 8EC1                            mov     es, cx
   957 0000069A 8EE1                            mov     fs, cx
   958 0000069C 8EE9                            mov     gs, cx
   959                                  
   960 0000069E 0F20D9                  	mov	ecx, cr3
   961 000006A1 890D[F85D0100]          	mov	[cr3reg], ecx ; save current cr3 register value/content
   962                                  
   963                                  	; 14/01/2017
   964 000006A7 3B0D[E0410100]          	cmp 	ecx, [k_page_dir]
   965 000006AD 7409                    	je	short T3
   966                                  
   967 000006AF 8B0D[E0410100]          	mov	ecx, [k_page_dir]
   968 000006B5 0F22D9                  	mov	cr3, ecx
   969                                  T3:
   970                                  	;sti				; INTERRUPTS BACK ON
   971 000006B8 66FF05[60420100]        	INC	word [TIMER_LOW]	; INCREMENT TIME
   972 000006BF 7507                    	JNZ	short T4		; GO TO TEST_DAY
   973 000006C1 66FF05[62420100]        	INC	word [TIMER_HIGH]	; INCREMENT HIGH WORD OF TIME
   974                                  T4:					; TEST_DAY
   975 000006C8 66833D[62420100]18      	CMP	word [TIMER_HIGH],018H	; TEST FOR COUNT EQUALING 24 HOURS
   976 000006D0 7519                    	JNZ	short T5		; GO TO DISKETTE_CTL
   977 000006D2 66813D[60420100]B0-     	CMP	word [TIMER_LOW],0B0H
   977 000006DA 00                 
   978 000006DB 750E                    	JNZ	short T5		; GO TO DISKETTE_CTL
   979                                  
   980                                  ;-----	TIMER HAS GONE 24 HOURS
   981                                  	;;SUB	AX,AX
   982                                  	;MOV	[TIMER_HIGH],AX
   983                                  	;MOV	[TIMER_LOW],AX
   984 000006DD 29C0                    	sub	eax, eax
   985 000006DF A3[60420100]            	mov	[TIMER_LH], eax
   986                                  	;	
   987 000006E4 C605[64420100]01        	MOV	byte [TIMER_OFL],1
   988                                  
   989                                  ;-----	TEST FOR DISKETTE TIME OUT
   990                                  
   991                                  T5:
   992                                  	; 23/12/2014
   993 000006EB EB1D                    	jmp	short T6		; will be replaced with nop, nop
   994                                  					; (9090h) if a floppy disk
   995                                  					; is detected.
   996                                  	;mov	al,[CS:MOTOR_COUNT]
   997 000006ED A0[67420100]            	mov	al, [MOTOR_COUNT]
   998 000006F2 FEC8                    	dec	al
   999                                  	;mov	[CS:MOTOR_COUNT], al	; DECREMENT DISKETTE MOTOR CONTROL
  1000 000006F4 A2[67420100]            	mov	[MOTOR_COUNT], al
  1001                                  	;mov	[ORG_MOTOR_COUNT], al
  1002 000006F9 750F                    	JNZ	short T6		; RETURN IF COUNT NOT OUT
  1003 000006FB B0F0                    	mov 	al,0F0h
  1004                                  	;AND	[CS:MOTOR_STATUS],al 	; TURN OFF MOTOR RUNNING BITS
  1005 000006FD 2005[66420100]          	and	[MOTOR_STATUS], al
  1006                                  	;and	[ORG_MOTOR_STATUS], al
  1007 00000703 B00C                    	MOV	AL,0CH			; bit 3 = enable IRQ & DMA, 
  1008                                  					; bit 2 = enable controller
  1009                                  					;	1 = normal operation
  1010                                  					;	0 = reset	
  1011                                  					; bit 0, 1 = drive select
  1012                                  					; bit 4-7 = motor running bits 
  1013 00000705 66BAF203                	MOV	DX,03F2H		; FDC CTL PORT
  1014 00000709 EE                      	OUT	DX,AL			; TURN OFF THE MOTOR
  1015                                  T6:	
  1016                                  	;inc	word [CS:wait_count]	; 22/12/2014 (byte -> word)
  1017                                  					; TIMER TICK INTERRUPT
  1018                                  	;;inc	word [wait_count] ;;27/02/2015
  1019                                  	;INT	1CH			; TRANSFER CONTROL TO A USER ROUTINE
  1020                                  	;cli
  1021 0000070A E857040000              	call 	u_timer			; TRANSFER CONTROL TO A USER ROUTINE
  1022                                  	; 23/05/2016
  1023 0000070F E834EB0000              	call	clock			; Multi Tasking control procedure
  1024                                  T7:
  1025                                  	; 14/10/2015
  1026 00000714 B020                    	MOV	AL,EOI			; GET END OF INTERRUPT MASK
  1027 00000716 FA                      	CLI				; DISABLE INTERRUPTS TILL STACK CLEARED
  1028 00000717 E620                    	OUT	INTA00,AL		; END OF INTERRUPT TO 8259 - 1	
  1029                                  	;
  1030                                  rtc_int_2:
  1031                                  	; 26/12/2016
  1032                                  	;mov	ecx, [cr3reg]
  1033                                  	; 13/01/2017
  1034 00000719 803D[705D0100]00        	cmp	byte [u.t_lock], 0  	; T_LOCK
  1035 00000720 7730                    	ja	short timer_int_return  ; Timer Lock : 'sysrele' is needed !
  1036                                  	; 28/02/2017
  1037                                  	; We need to exit if the user's IRQ callback service is in progress!
  1038                                  	; (To prevent a conflict!)
  1039 00000722 803D[745D0100]00        	cmp	byte [u.r_lock], 0	; R_LOCK, IRQ callback service lock !
  1040 00000729 7727                    	ja	short timer_int_return  ; Timer Lock : 'sysrele' is needed !	
  1041                                  	; 15/01/2017
  1042 0000072B 803D[744F0100]02        	cmp	byte [priority], 2
  1043 00000732 733A                    	jnb	short T8  ; current process has a timer event (15/01/2017)
  1044                                  	; 22/05/2016
  1045 00000734 803D[754F0100]00        	cmp	byte [p_change], 0 ; in 'set_run_sequence', in 'rtc_p'
  1046 0000073B 7615                    	jna	short timer_int_return ; 23/05/2016
  1047                                  
  1048                                  	; 15/01/2017
  1049                                  	
  1050                                  	; present process must be changed with high priority process	
  1051                                  	;xor	al, al
  1052 0000073D 31C0                    	xor	eax, eax ; 26/12/2016
  1053 0000073F A2[754F0100]            	mov	[p_change], al ; 0
  1054                                  	;mov	byte [priority], 2 ; 15/01/2017 (there is a timer event)
  1055                                  
  1056 00000744 803D[F75C0100]FF        	cmp     byte [sysflg], 0FFh ; user or system space ?
  1057 0000074B 7416                    	je	short rtc_int_3     ; user space ([sysflg]= 0FFh)
  1058                                  
  1059                                  	; system space, wait for 'sysret'
  1060                                  	; to change running process 	
  1061                                  	; with high priority (event) process
  1062                                  
  1063 0000074D A2[445D0100]            	mov	[u.quant], al ; 0
  1064                                  
  1065                                  timer_int_return: ; 23/05/2016 - jump from 'rtc_int' ('rtc_int_2')
  1066 00000752 8B0D[F85D0100]          	mov 	ecx, [cr3reg] 	; previous value/content of cr3 register
  1067 00000758 0F22D9                   	mov	cr3, ecx	; restore cr3 register content
  1068                                  	;
  1069 0000075B 61                      	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
  1070                                  	;
  1071 0000075C 0FA9                    	pop	gs
  1072 0000075E 0FA1                    	pop	fs
  1073 00000760 07                      	pop	es
  1074 00000761 1F                      	pop	ds
  1075                                  	;
  1076 00000762 CF                      	iretd	; return from interrupt
  1077                                  
  1078                                  rtc_int_3:
  1079 00000763 FE05[F75C0100]          	inc	byte [sysflg] 	; now, we are in system space
  1080                                  	;
  1081 00000769 E9C1BC0000                      jmp     sysrelease ; change running process immediatelly 
  1082                                  
  1083                                  T8:
  1084                                  	; 13/01/2017 (eax -> ebx)
  1085                                  	; callback checking... (19/12/2016)
  1086 0000076E 31DB                    	xor	ebx, ebx
  1087 00000770 871D[6C5D0100]          	xchg	ebx, [u.tcb] ; callback address (0 = normal return)
  1088 00000776 09DB                    	or	ebx, ebx
  1089 00000778 74D8                    	jz	short timer_int_return
  1090                                  
  1091                                  	; Set user's callback routine as return address from this interrupt
  1092                                  	; and set normal return address as return address from callback
  1093                                  	; routine!!! (19/12/2016)
  1094                                  	
  1095                                  	; 14/01/2017
  1096                                  	; 13/01/2017 - Timer Lock (T_LOCK)
  1097 0000077A FE05[705D0100]          	inc	byte [u.t_lock]
  1098 00000780 8A0D[F75C0100]          	mov	cl, [sysflg]
  1099 00000786 880D[715D0100]          	mov	[u.t_mode], cl 
  1100                                  
  1101 0000078C 8B2D[7C410100]          	mov	ebp, [tss.esp0] ; kernel stack address (for ring 0)
  1102 00000792 83ED14                  	sub	ebp, 20		; eip, cs, eflags, esp, ss
  1103 00000795 892D[F85C0100]           	mov	[u.sp], ebp
  1104 0000079B 8925[FC5C0100]          	mov	[u.usp], esp
  1105                                  
  1106                                  	;or	word [ebp+8], 200h ; 22/01/2017, force enabling interrupts
  1107                                  
  1108 000007A1 8B44241C                	mov	eax, [esp+28] ; pushed eax
  1109 000007A5 A3[005D0100]            	mov	[u.r0], eax
  1110                                  
  1111 000007AA E8C2DE0000              	call	wswap ; save user's registers & status
  1112                                  
  1113                                  	; software int is in ring 0 but timer int must return to ring 3
  1114                                  	; so, ring 3 return address and stack registers
  1115                                  	; (eip, cs, eflags, esp, ss) 
  1116                                  	; must be copied to timer int return
  1117                                  	; eip will be replaced by callback service routine address
  1118                                  
  1119 000007AF C605[F75C0100]FF        	mov	byte [sysflg], 0FFh ; user mode
  1120                                  
  1121                                  	; system mode (system call)
  1122                                  	;mov	ebp, [u.sp] ; EIP (u), CS (UCODE), EFLAGS (u),
  1123                                  			    ; ESP (u), SS (UDATA)
  1124                                  
  1125 000007B6 8B4510                  	mov	eax, [ebp+16]	; SS (UDATA
  1126 000007B9 89E6                    	mov	esi, esp
  1127 000007BB 50                      	push	eax
  1128 000007BC 50                      	push	eax
  1129 000007BD 89E7                    	mov	edi, esp
  1130 000007BF 893D[FC5C0100]          	mov	[u.usp], edi
  1131 000007C5 B908000000              	mov	ecx, ((ESPACE/4) - 4) ; except DS, ES, FS, GS
  1132 000007CA F3A5                    	rep	movsd
  1133 000007CC B104                    	mov	cl, 4	
  1134 000007CE F3AB                    	rep	stosd
  1135 000007D0 893D[F85C0100]          	mov	[u.sp], edi
  1136 000007D6 89EE                    	mov	esi, ebp
  1137 000007D8 B105                    	mov	cl, 5 ; EIP (u), CS (UCODE), EFLAGS (u), ESP (u), SS (UDATA)
  1138 000007DA F3A5                    	rep	movsd
  1139                                  
  1140 000007DC 8B0D[545D0100]          	mov	ecx, [u.pgdir]
  1141 000007E2 890D[F85D0100]          	mov	[cr3reg], ecx
  1142                                  
  1143                                  	; 13/01/207 (eax -> ebx)
  1144                                  	; EBX = callback routine address (virtual, not physical address!)
  1145                                  
  1146                                  	; 09/01/2017
  1147                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'sysrele'
  1148                                  	;     system call !!!	
  1149                                  	; 25/12/2016
  1150                                  	; Callback Note: (19/12/2016)
  1151                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'RETN' !!!
  1152                                  	;	pushf ; save flags	
  1153                                  	; 	<callback service code>
  1154                                  	; 	popf  ; restore flags
  1155                                  	; 	retn ; return to normal running address
  1156                                  	;
  1157                                  
  1158                                  	; 15/01/2017
  1159                                  	; 14/01/2017
  1160                                  	; 13/01/2017 (eax -> ebx)
  1161                                  	; 10/01/2017
  1162                                  set_callback_addr:
  1163                                  	; 09/01/2017 (**)
  1164                                  	; 02/01/2017 (*)
  1165                                  	; 25/12/2016 (*)
  1166                                  	; 19/12/2016 (TRDOS 386 feature only!)
  1167                                  	;
  1168                                  	; This routine sets return address
  1169                                  	; to start of user's interrupt
  1170                                  	; service (callback) address
  1171                                  	;; and sets callback 'retn' address to normal
  1172                                  	;; return address of user's running code! 
  1173                                  	;
  1174                                  	; INPUT:
  1175                                  	;	EBX = callback routine/service address
  1176                                  	;	      (virtual, not physical address!)	
  1177                                  	;	[u.sp] = kernel stack, points to
  1178                                  	;		 user's EIP,CS,EFLAGS,ESP,SS
  1179                                  	;		 registers.
  1180                                  	; OUTPUT:
  1181                                  	;	EIP (user) = callback (service) address
  1182                                  	;	CS (user) = UCODE
  1183                                  	;	EFLAGS (user) = flags before callback 	 
  1184                                  	;       ESP (user) = ESP-4 (user, before callback) 
  1185                                  	;	[ESP](user) = EIP (user) before callback
  1186                                  	;
  1187                                  	; Note: If CPU was in user mode while entering 
  1188                                  	;	the timer interrupt service routine,
  1189                                  	;	'IRET' will get return to callback routine
  1190                                  	;	immediately. If CPU was in system/kernel mode  
  1191                                  	;	'iret' will get return to system call and
  1192                                  	;	then, callback routine will be return address
  1193                                  	;	from system call. (User's callback/service code
  1194                                  	;	will be able to return to normal return address
  1195                                  	;	via an 'retn' at the end.) 
  1196                                  	;
  1197                                  	; Note(**): User's callback service code must be ended
  1198                                  	;	with a 'sysrele' sytstem call ! (09/01/2017)
  1199                                  	;
  1200                                  	;	For example:
  1201                                  	;
  1202                                  	;	timer_callback:
  1203                                  	;	    ...	 
  1204                                    	;	    inc	dword [time_counter]
  1205                                  	;	    ...
  1206                                  	;	    mov eax, 39 ; 'sysrele'
  1207                                  	;	    int 40h ; TRDOS 386 system call (interrupt)		
  1208                                  	;
  1209                                  	;
  1210                                  	;; Note(*): User's callback service code must preserve cpu 
  1211                                  	;;	flags if it has any instructions which changes
  1212                                  	;;	flags in the service code. (25/12/2016)
  1213                                  	;;
  1214                                  	;;	For example:
  1215                                  	;;
  1216                                  	;;	timer_callback:
  1217                                  	;;	    pushf ; save flags
  1218                                  	;;	    ; this instruction changes zero flag
  1219                                    	;;	    inc	dword [time_counter]
  1220                                  	;;	    popf ; restore flags
  1221                                  	;;	    retn ; return to normal user code
  1222                                  	;;		  (which is interrupted by the 
  1223                                  	;;		   timer interput) 	
  1224                                  	;;
  1225                                  
  1226                                  	; 15/01/2017
  1227 000007E8 8B2D[F85C0100]          	mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
  1228 000007EE 895D00                  	mov	[ebp], ebx
  1229 000007F1 E95CFFFFFF              	jmp	timer_int_return
  1230                                  
  1231                                  	; 15/01/2017
  1232                                  	; 13/01/2017
  1233                                  	; 19/12/2016
  1234                                  	; 06/06/2016
  1235                                  	; 23/05/2016
  1236                                  	; 22/05/2016
  1237                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1238                                  	; 26/02/2015
  1239                                  	; 07/09/2014
  1240                                  	; 25/08/2014
  1241                                  rtc_int:       ; Real Time Clock Interrupt (IRQ 8)
  1242                                  	; 22/05/2016
  1243 000007F6 1E                      	push	ds ; ** ; 23/05/2016
  1244 000007F7 50                      	push	eax ; *
  1245 000007F8 66B81000                	mov	ax, KDATA
  1246 000007FC 8ED8                    	mov	ds, ax
  1247                                  	;
  1248 000007FE 8A25[5E420100]          	mov	ah, [RTC_2Hz] ;  2 Hz interrupt to 1 Hz function
  1249 00000804 80F401                  	xor	ah, 1
  1250 00000807 8825[5E420100]          	mov	[RTC_2Hz], ah ; 1 = 0.5 second, 0 = 1 second
  1251 0000080D 753B                    	jnz	short rtc_int_return ; half second
  1252                                  	; 1 second
  1253                                  rtc_int_0:
  1254                                  	; 22/05/2016
  1255 0000080F 58                      	pop	eax ; *
  1256                                  	;
  1257                                  	; 14/10/2015 ('timer_int')
  1258                                  	; Here, we are simulating system call entry (for task switch)
  1259                                  	; (If multitasking is enabled, 
  1260                                  	; 'clock' procedure may jump to 'sysrelease')
  1261                                  	;push	ds ; ** ; 23/05/2016
  1262 00000810 06                      	push	es
  1263 00000811 0FA0                    	push	fs
  1264 00000813 0FA8                    	push	gs
  1265 00000815 60                      	pushad  ; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
  1266 00000816 66B91000                	mov     cx, KDATA
  1267                                          ;mov    ds, cx ; 06/06/2016
  1268 0000081A 8EC1                            mov     es, cx
  1269 0000081C 8EE1                            mov     fs, cx
  1270 0000081E 8EE9                            mov     gs, cx
  1271                                  	;
  1272 00000820 0F20D9                  	mov	ecx, cr3
  1273 00000823 890D[F85D0100]          	mov	[cr3reg], ecx ; save current cr3 register value/content
  1274                                  	;
  1275 00000829 803D[705D0100]00        	cmp	byte [u.t_lock], 0 ; timer lock (callback) status ?
  1276 00000830 7711                    	ja	short rtc_int_1	   ; yes
  1277                                  
  1278                                  	; 15/01/2017
  1279 00000832 3B0D[E0410100]          	cmp 	ecx, [k_page_dir]
  1280 00000838 7409                    	je	short rtc_int_1
  1281                                  
  1282 0000083A 8B0D[E0410100]          	mov	ecx, [k_page_dir]
  1283 00000840 0F22D9                  	mov	cr3, ecx
  1284                                  rtc_int_1:
  1285                                  	; Timer event (kernel) functions must be performed with
  1286                                  	; 1 second intervals - TRDOS 386 (TRDOS v2.0) feature ! -
  1287                                   	;	
  1288                                  	; 25/08/2014
  1289 00000843 E81A030000              	call	rtc_p  ; 19/05/2016 - major modification 
  1290                                  	
  1291                                  	; 23/05/2016
  1292 00000848 28E4                    	sub	ah, ah ; 0
  1293                                  	; 22/05/2016 - TRDOS 386 timer event modifications
  1294                                  rtc_int_return: ; 19/05/2016
  1295                                  	; 22/02/2015 - dsectpm.s
  1296                                  	; [ source: http://wiki.osdev.org/RTC ]
  1297                                  	; read status register C to complete procedure
  1298                                  	;(it is needed to get a next IRQ 8) 
  1299 0000084A B00C                    	mov	al, 0Ch ; 
  1300 0000084C E670                    	out	70h, al ; select register C
  1301 0000084E 90                      	nop
  1302 0000084F E471                    	in	al, 71h ; just throw away contents
  1303                                  	; 22/02/2015
  1304 00000851 B020                    	MOV	AL,EOI		; END OF INTERRUPT
  1305                                  	;CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  1306 00000853 E6A0                    	OUT	INTB00,AL	; FOR CONTROLLER #2
  1307                                  
  1308                                  	; 23/05/2016
  1309 00000855 B020                    	MOV	AL,EOI		; GET END OF INTERRUPT MASK
  1310 00000857 FA                      	CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  1311 00000858 E620                    	OUT	INTA00,AL	; END OF INTERRUPT TO 8259 - 1	
  1312                                  	;
  1313                                  	; 23/05/2016
  1314 0000085A 20E4                    	and	ah, ah
  1315 0000085C 0F84B7FEFFFF                    jz      rtc_int_2
  1316                                  	
  1317                                  	; ah = 1 (half second)
  1318 00000862 58                      	pop	eax ; *
  1319 00000863 1F                      	pop	ds  ; **
  1320 00000864 CF                      	iretd
  1321                                  
  1322                                  ; ////////////////
  1323                                  
  1324                                  	; 28/08/2014
  1325                                  irq0:
  1326 00000865 6A00                            push 	dword 0
  1327 00000867 EB48                    	jmp	short which_irq
  1328                                  irq1:
  1329 00000869 6A01                            push 	dword 1
  1330 0000086B EB44                    	jmp	short which_irq
  1331                                  irq2:
  1332 0000086D 6A02                            push 	dword 2
  1333 0000086F EB40                    	jmp	short which_irq
  1334                                  irq3:
  1335                                  	; 20/11/2015
  1336                                  	; 24/10/2015
  1337 00000871 2EFF15[E8F40000]        	call	dword [cs:com2_irq3]
  1338 00000878 6A03                    	push 	dword 3
  1339 0000087A EB35                    	jmp	short which_irq
  1340                                  irq4:
  1341                                  	; 20/11/2015
  1342                                  	; 24/10/2015
  1343 0000087C 2EFF15[E4F40000]        	call	dword [cs:com1_irq4]
  1344 00000883 6A04                            push 	dword 4
  1345 00000885 EB2A                    	jmp	short which_irq
  1346                                  irq5:
  1347 00000887 6A05                            push 	dword 5
  1348 00000889 EB26                    	jmp	short which_irq
  1349                                  irq6:
  1350 0000088B 6A06                            push 	dword 6
  1351 0000088D EB22                    	jmp	short which_irq
  1352                                  irq7:
  1353 0000088F 6A07                            push 	dword 7
  1354 00000891 EB1E                    	jmp	short which_irq
  1355                                  irq8:
  1356 00000893 6A08                            push 	dword 8
  1357 00000895 EB1A                    	jmp	short which_irq
  1358                                  irq9:
  1359 00000897 6A09                            push 	dword 9
  1360 00000899 EB16                    	jmp	short which_irq
  1361                                  irq10:
  1362 0000089B 6A0A                            push 	dword 10
  1363 0000089D EB12                    	jmp	short which_irq
  1364                                  irq11:
  1365 0000089F 6A0B                            push 	dword 11
  1366 000008A1 EB0E                    	jmp	short which_irq
  1367                                  irq12:
  1368 000008A3 6A0C                            push 	dword 12
  1369 000008A5 EB0A                    	jmp	short which_irq
  1370                                  irq13:
  1371 000008A7 6A0D                            push 	dword 13
  1372 000008A9 EB06                    	jmp	short which_irq
  1373                                  irq14:
  1374 000008AB 6A0E                            push 	dword 14
  1375 000008AD EB02                    	jmp	short which_irq
  1376                                  irq15:
  1377 000008AF 6A0F                            push 	dword 15
  1378                                  	;jmp	short which_irq
  1379                                  
  1380                                  	; 22/01/2017
  1381                                  	; 19/10/2015
  1382                                  	; 29/08/2014
  1383                                  	; 21/08/2014
  1384                                  which_irq:
  1385 000008B1 870424                  	xchg	eax, [esp]  ; 28/08/2014
  1386 000008B4 53                      	push	ebx
  1387 000008B5 56                      	push	esi
  1388 000008B6 57                      	push	edi
  1389 000008B7 1E                      	push 	ds
  1390 000008B8 06                      	push 	es
  1391                                  	;
  1392 000008B9 88C3                    	mov	bl, al
  1393                                  	;
  1394 000008BB B810000000              	mov	eax, KDATA
  1395 000008C0 8ED8                    	mov	ds, ax
  1396 000008C2 8EC0                    	mov	es, ax
  1397                                  	; 19/10/2015
  1398 000008C4 FC                      	cld
  1399                                          ; 27/08/2014
  1400 000008C5 8105[28080100]A000-             add     dword [scr_row], 0A0h
  1400 000008CD 0000               
  1401                                  	;
  1402 000008CF B417                    	mov	ah, 17h	; blue (1) background, 
  1403                                  			; light gray (7) forecolor
  1404 000008D1 8B3D[28080100]                  mov     edi, [scr_row]
  1405 000008D7 B049                    	mov	al, 'I'
  1406 000008D9 66AB                    	stosw
  1407 000008DB B052                    	mov	al, 'R'
  1408 000008DD 66AB                    	stosw
  1409 000008DF B051                    	mov	al, 'Q'
  1410 000008E1 66AB                    	stosw
  1411 000008E3 B020                    	mov	al, ' '
  1412 000008E5 66AB                    	stosw
  1413 000008E7 88D8                    	mov	al, bl
  1414 000008E9 3C0A                    	cmp	al, 10
  1415 000008EB 7208                    	jb	short ii1
  1416 000008ED B031                    	mov	al, '1'
  1417 000008EF 66AB                    	stosw
  1418 000008F1 88D8                    	mov	al, bl
  1419 000008F3 2C0A                    	sub	al, 10
  1420                                  ii1:
  1421 000008F5 0430                    	add	al, '0'
  1422 000008F7 66AB                    	stosw
  1423 000008F9 B020                    	mov	al, ' '
  1424 000008FB 66AB                    	stosw
  1425 000008FD B021                    	mov	al, '!'
  1426 000008FF 66AB                    	stosw
  1427 00000901 B020                    	mov	al, ' '
  1428 00000903 66AB                    	stosw
  1429                                  	; 23/02/2015
  1430 00000905 80FB07                  	cmp	bl, 7 ; check for IRQ 8 to IRQ 15 
  1431 00000908 7604                    	jna	ii2
  1432                                  	; 22/01/2017
  1433 0000090A B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1434 0000090C E6A0                    	out	0A0h, al ; the 2nd 8259
  1435                                  ii2:
  1436 0000090E B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1437 00000910 E620                    	out	20h, al ; the 2nd 8259
  1438 00000912 E9CD010000              	jmp     iiret
  1439                                  	;
  1440                                  	; 22/08/2014
  1441                                  	;mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  1442                                  	;out	20h, al	; 8259 PORT
  1443                                  	;
  1444                                  	;pop	es
  1445                                  	;pop	ds
  1446                                  	;pop	edi
  1447                                  	;pop	esi
  1448                                  	;pop	ebx
  1449                                  	;pop 	eax
  1450                                  	;iret
  1451                                  
  1452                                  	; 02/04/2015
  1453                                  	; 25/08/2014
  1454                                  exc0:
  1455 00000917 6A00                            push 	dword 0
  1456 00000919 E990000000                      jmp     cpu_except
  1457                                  exc1:
  1458 0000091E 6A01                            push 	dword 1
  1459 00000920 E989000000                      jmp     cpu_except
  1460                                  exc2:
  1461 00000925 6A02                            push 	dword 2
  1462 00000927 E982000000                      jmp     cpu_except
  1463                                  exc3:
  1464 0000092C 6A03                            push 	dword 3
  1465 0000092E EB7E                            jmp     cpu_except
  1466                                  exc4:
  1467 00000930 6A04                            push 	dword 4
  1468 00000932 EB7A                            jmp     cpu_except
  1469                                  exc5:
  1470 00000934 6A05                            push 	dword 5
  1471 00000936 EB76                            jmp     cpu_except
  1472                                  exc6:
  1473 00000938 6A06                            push 	dword 6
  1474 0000093A EB72                            jmp     cpu_except
  1475                                  exc7:
  1476 0000093C 6A07                            push 	dword 7
  1477 0000093E EB6E                            jmp     cpu_except
  1478                                  exc8:
  1479                                  	; [esp] = Error code
  1480 00000940 6A08                            push 	dword 8
  1481 00000942 EB5C                            jmp     cpu_except_en
  1482                                  exc9:
  1483 00000944 6A09                            push 	dword 9
  1484 00000946 EB66                            jmp     cpu_except
  1485                                  exc10:
  1486                                  	; [esp] = Error code
  1487 00000948 6A0A                            push 	dword 10
  1488 0000094A EB54                            jmp     cpu_except_en
  1489                                  exc11:
  1490                                  	; [esp] = Error code
  1491 0000094C 6A0B                            push 	dword 11
  1492 0000094E EB50                            jmp     cpu_except_en
  1493                                  exc12:
  1494                                  	; [esp] = Error code
  1495 00000950 6A0C                            push 	dword 12
  1496 00000952 EB4C                            jmp     cpu_except_en
  1497                                  exc13:
  1498                                  	; [esp] = Error code
  1499 00000954 6A0D                            push 	dword 13
  1500 00000956 EB48                            jmp     cpu_except_en
  1501                                  exc14:
  1502                                  	; [esp] = Error code
  1503 00000958 6A0E                            push 	dword 14
  1504 0000095A EB44                    	jmp	short cpu_except_en
  1505                                  exc15:
  1506 0000095C 6A0F                            push 	dword 15
  1507 0000095E EB4E                            jmp     cpu_except
  1508                                  exc16:
  1509 00000960 6A10                            push 	dword 16
  1510 00000962 EB4A                            jmp     cpu_except
  1511                                  exc17:
  1512                                  	; [esp] = Error code
  1513 00000964 6A11                            push 	dword 17
  1514 00000966 EB38                    	jmp	short cpu_except_en
  1515                                  exc18:
  1516 00000968 6A12                            push 	dword 18
  1517 0000096A EB42                    	jmp	short cpu_except
  1518                                  exc19:
  1519 0000096C 6A13                            push 	dword 19
  1520 0000096E EB3E                    	jmp	short cpu_except
  1521                                  exc20:
  1522 00000970 6A14                            push 	dword 20
  1523 00000972 EB3A                    	jmp	short cpu_except
  1524                                  exc21:
  1525 00000974 6A15                            push 	dword 21
  1526 00000976 EB36                    	jmp	short cpu_except
  1527                                  exc22:
  1528 00000978 6A16                            push 	dword 22
  1529 0000097A EB32                    	jmp	short cpu_except
  1530                                  exc23:
  1531 0000097C 6A17                            push 	dword 23
  1532 0000097E EB2E                    	jmp	short cpu_except
  1533                                  exc24:
  1534 00000980 6A18                            push 	dword 24
  1535 00000982 EB2A                    	jmp	short cpu_except
  1536                                  exc25:
  1537 00000984 6A19                            push 	dword 25
  1538 00000986 EB26                    	jmp	short cpu_except
  1539                                  exc26:
  1540 00000988 6A1A                            push 	dword 26
  1541 0000098A EB22                    	jmp	short cpu_except
  1542                                  exc27:
  1543 0000098C 6A1B                            push 	dword 27
  1544 0000098E EB1E                    	jmp	short cpu_except
  1545                                  exc28:
  1546 00000990 6A1C                            push 	dword 28
  1547 00000992 EB1A                    	jmp	short cpu_except
  1548                                  exc29:
  1549 00000994 6A1D                            push 	dword 29
  1550 00000996 EB16                    	jmp	short cpu_except
  1551                                  exc30:
  1552 00000998 6A1E                            push 	dword 30
  1553 0000099A EB04                    	jmp	short cpu_except_en
  1554                                  exc31:
  1555 0000099C 6A1F                            push 	dword 31
  1556 0000099E EB0E                            jmp     short cpu_except
  1557                                  
  1558                                  	; 19/10/2015
  1559                                  	; 19/09/2015
  1560                                  	; 01/09/2015
  1561                                  	; 28/08/2015
  1562                                  	; 28/08/2014
  1563                                  cpu_except_en:
  1564 000009A0 87442404                	xchg	eax, [esp+4] ; Error code
  1565 000009A4 36A3[145F0100]          	mov	[ss:error_code], eax
  1566 000009AA 58                      	pop	eax  ; Exception number
  1567 000009AB 870424                  	xchg	eax, [esp]
  1568                                  		; eax = eax before exception
  1569                                  		; [esp] -> exception number
  1570                                  		; [esp+4] -> EIP to return
  1571                                  	; 22/01/2017
  1572                                  	; 19/10/2015
  1573                                  	; 19/09/2015
  1574                                  	; 01/09/2015
  1575                                  	; 28/08/2015
  1576                                  	; 29/08/2014
  1577                                  	; 28/08/2014
  1578                                  	; 25/08/2014
  1579                                  	; 21/08/2014
  1580                                  cpu_except:	; CPU Exceptions
  1581 000009AE FC                      	cld
  1582 000009AF 870424                  	xchg	eax, [esp] 
  1583                                  		; eax = Exception number
  1584                                  		; [esp] = eax (before exception)	
  1585 000009B2 53                      	push	ebx
  1586 000009B3 56                      	push	esi
  1587 000009B4 57                      	push	edi
  1588 000009B5 1E                      	push 	ds
  1589 000009B6 06                      	push 	es
  1590                                  	; 28/08/2015
  1591 000009B7 66BB1000                	mov	bx, KDATA
  1592 000009BB 8EDB                    	mov	ds, bx
  1593 000009BD 8EC3                    	mov	es, bx
  1594 000009BF 0F20DB                  	mov	ebx, cr3
  1595 000009C2 53                      	push	ebx ; (*) page directory
  1596                                  	; 19/10/2015
  1597 000009C3 FC                      	cld
  1598                                  	; 25/03/2015
  1599 000009C4 8B1D[E0410100]          	mov	ebx, [k_page_dir]
  1600 000009CA 0F22DB                  	mov	cr3, ebx
  1601                                  	; 28/08/2015
  1602 000009CD 83F80E                  	cmp	eax, 0Eh ; 14, PAGE FAULT	
  1603 000009D0 750F                    	jne	short cpu_except_nfp
  1604 000009D2 E87A440000              	call	page_fault_handler
  1605 000009D7 21C0                    	and 	eax, eax
  1606 000009D9 0F8401010000                    jz	iiretp ; 01/09/2015
  1607 000009DF B00E                    	mov	al, 0Eh ; 14
  1608                                  cpu_except_nfp:
  1609                                  	; 23/08/2016
  1610 000009E1 803D[225E0000]03        	cmp	byte [CRT_MODE], 3
  1611 000009E8 7409                    	je	short cpu_except_mode_3
  1612 000009EA 50                      	push	eax
  1613 000009EB B003                    	mov	al, 3
  1614 000009ED E8730B0000              	call	_set_mode
  1615 000009F2 58                      	pop	eax
  1616                                  cpu_except_mode_3:
  1617                                  	; 02/04/2015
  1618 000009F3 BB[42060000]            	mov	ebx, hang
  1619 000009F8 875C241C                	xchg	ebx, [esp+28]
  1620                                  		; EIP (points to instruction which faults)
  1621                                  	  	; New EIP (hang)
  1622 000009FC 891D[185F0100]          	mov	[FaultOffset], ebx
  1623 00000A02 C744242008000000        	mov	dword [esp+32], KCODE ; kernel's code segment
  1624 00000A0A 814C242400020000        	or	dword [esp+36], 200h ; enable interrupts (set IF)
  1625                                  	;
  1626 00000A12 88C4                    	mov	ah, al
  1627 00000A14 240F                    	and	al, 0Fh
  1628 00000A16 3C09                    	cmp	al, 9
  1629 00000A18 7602                    	jna	short h1ok
  1630 00000A1A 0407                    	add	al, 'A'-':'
  1631                                  h1ok:
  1632 00000A1C C0EC04                  	shr	ah, 4
  1633 00000A1F 80FC09                  	cmp	ah, 9
  1634 00000A22 7603                    	jna	short h2ok
  1635 00000A24 80C407                  	add	ah, 'A'-':'
  1636                                  h2ok:	
  1637 00000A27 86E0                    	xchg 	ah, al	
  1638 00000A29 66053030                	add	ax, '00'
  1639 00000A2D 66A3[800A0100]          	mov	[excnstr], ax
  1640                                  	;
  1641                                  	; 29/08/2014
  1642 00000A33 A1[185F0100]            	mov	eax, [FaultOffset]
  1643 00000A38 51                      	push	ecx
  1644 00000A39 52                      	push	edx
  1645 00000A3A 89E3                    	mov	ebx, esp
  1646                                  	; 28/08/2015
  1647 00000A3C B910000000              	mov	ecx, 16	  ; divisor value to convert binary number
  1648                                  			  ; to hexadecimal string
  1649                                  	;mov	ecx, 10	    ; divisor to convert	
  1650                                  			    ; binary number to decimal string
  1651                                  b2d1:
  1652 00000A41 31D2                    	xor	edx, edx
  1653 00000A43 F7F1                    	div	ecx
  1654 00000A45 6652                    	push	dx
  1655 00000A47 39C8                    	cmp	eax, ecx
  1656 00000A49 73F6                    	jnb	short b2d1
  1657 00000A4B BF[8B0A0100]            	mov	edi, EIPstr ; EIP value
  1658                                  			    ; points to instruction which faults	
  1659                                  	; 28/08/2015
  1660 00000A50 89C2                    	mov	edx, eax
  1661                                  b2d2:
  1662                                  	;add	al, '0'
  1663 00000A52 8A82[1B330000]          	mov	al, [edx+hexchrs]
  1664 00000A58 AA                      	stosb		    ; write hexadecimal digit to its place	
  1665 00000A59 39E3                    	cmp	ebx, esp
  1666 00000A5B 7606                    	jna	short b2d3
  1667 00000A5D 6658                    	pop	ax
  1668 00000A5F 88C2                    	mov	dl, al
  1669 00000A61 EBEF                    	jmp	short b2d2
  1670                                  b2d3:
  1671 00000A63 B068                    	mov 	al, 'h' ; 28/08/2015
  1672 00000A65 AA                      	stosb
  1673 00000A66 B020                    	mov	al, 20h	    ; space
  1674 00000A68 AA                      	stosb
  1675 00000A69 30C0                    	xor	al, al	    ; to do it an ASCIIZ string	
  1676 00000A6B AA                      	stosb
  1677                                  	;
  1678 00000A6C 5A                      	pop	edx
  1679 00000A6D 59                      	pop	ecx
  1680                                  	;
  1681 00000A6E B44F                    	mov	ah, 4Fh	; red (4) background, 
  1682                                  			; white (F) forecolor
  1683 00000A70 BE[700A0100]            	mov	esi, exc_msg ; message offset
  1684                                  	;
  1685                                  	; 20/01/2017 (!cpu exception!)
  1686                                  	;
  1687 00000A75 8105[28080100]A000-             add    dword [scr_row], 0A0h
  1687 00000A7D 0000               
  1688 00000A7F 8B3D[28080100]                  mov    edi, [scr_row]
  1689                                  	;	
  1690 00000A85 C605[F75C0100]00        	mov	byte [sysflg], 0  ; system mode
  1691 00000A8C FB                              sti
  1692                                  	;
  1693 00000A8D E8EFFBFFFF              	call 	printk
  1694                                  	;
  1695 00000A92 B410                    	mov	ah, 10h
  1696 00000A94 E87D010000              	call	int16h ; getc
  1697                                  	;
  1698 00000A99 B003                    	mov	al, 3
  1699 00000A9B E8C50A0000              	call	_set_mode
  1700                                  	;
  1701 00000AA0 B801000000              	mov	eax, 1
  1702 00000AA5 E9ECBA0000              	jmp	sysexit ; terminate process !!!
  1703                                  	
  1704                                  	; 22/01/2017
  1705                                  	; 18/04/2016
  1706                                  	; 28/08/2015
  1707                                  	; 23/02/2015
  1708                                  	; 20/08/2014
  1709                                  ignore_int:
  1710 00000AAA 50                      	push	eax
  1711 00000AAB 53                      	push	ebx ; 23/02/2015
  1712 00000AAC 56                      	push	esi
  1713 00000AAD 57                      	push	edi
  1714 00000AAE 1E                      	push 	ds
  1715 00000AAF 06                      	push 	es
  1716                                  	; 18/04/2016
  1717 00000AB0 66B81000                	mov	ax, KDATA
  1718 00000AB4 8ED8                    	mov	ds, ax
  1719 00000AB6 8EC0                    	mov	es, ax
  1720                                  	; 28/08/2015
  1721 00000AB8 0F20D8                  	mov	eax, cr3
  1722 00000ABB 50                      	push	eax ; (*) page directory
  1723                                  	;
  1724 00000ABC B467                    	mov	ah, 67h	; brown (6) background, 
  1725                                  			; light gray (7) forecolor
  1726 00000ABE BE[38090100]            	mov	esi, int_msg ; message offset
  1727                                  piemsg:
  1728                                          ; 27/08/2014
  1729 00000AC3 8105[28080100]A000-             add     dword [scr_row], 0A0h
  1729 00000ACB 0000               
  1730 00000ACD 8B3D[28080100]                  mov     edi, [scr_row]
  1731                                          ;
  1732 00000AD3 E8A9FBFFFF              	call 	printk
  1733                                  	;
  1734                                  	; 23/02/2015
  1735 00000AD8 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1736 00000ADA E6A0                    	out	0A0h, al ; the 2nd 8259
  1737                                  	; 22/08/2014
  1738 00000ADC B020                    	mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  1739 00000ADE E620                    	out	20h, al	; 8259 PORT
  1740                                  iiretp: 
  1741                                  	; 22/01/2017
  1742                                  	; 01/09/2015
  1743                                  	; 28/08/2015
  1744 00000AE0 58                      	pop	eax ; (*) page directory
  1745 00000AE1 0F22D8                  	mov	cr3, eax
  1746                                  iiret:
  1747 00000AE4 07                      	pop	es
  1748 00000AE5 1F                      	pop	ds
  1749 00000AE6 5F                      	pop	edi
  1750 00000AE7 5E                      	pop	esi
  1751 00000AE8 5B                      	pop	ebx ; 29/08/2014
  1752 00000AE9 58                      	pop 	eax
  1753 00000AEA CF                      	iretd
  1754                                  
  1755                                  	; 23/05/2016
  1756                                  	; 22/08/2014
  1757                                  	; IBM PC/AT BIOS source code ----- 10/06/85 (bios.asm)
  1758                                  	; (INT 1Ah)
  1759                                  	;; Linux (v0.12) source code (main.c) by Linus Torvalds (1991)
  1760                                  time_of_day:
  1761 00000AEB E847500000              	call	UPD_IPR			; WAIT TILL UPDATE NOT IN PROGRESS
  1762 00000AF0 726F                            jc      short time_of_day_retn ; 23/05/2016
  1763 00000AF2 B000                    	mov	al, CMOS_SECONDS
  1764 00000AF4 E859500000              	call	CMOS_READ
  1765 00000AF9 A2[50420100]            	mov	[time_seconds], al 
  1766 00000AFE B002                    	mov	al, CMOS_MINUTES
  1767 00000B00 E84D500000              	call	CMOS_READ
  1768 00000B05 A2[51420100]            	mov	[time_minutes], al 
  1769 00000B0A B004                    	mov	al, CMOS_HOURS
  1770 00000B0C E841500000              	call	CMOS_READ
  1771 00000B11 A2[52420100]                    mov     [time_hours], al
  1772 00000B16 B006                    	mov	al, CMOS_DAY_WEEK 
  1773 00000B18 E835500000              	call	CMOS_READ
  1774 00000B1D A2[53420100]            	mov	[date_wday], al
  1775 00000B22 B007                     	mov	al, CMOS_DAY_MONTH
  1776 00000B24 E829500000              	call	CMOS_READ
  1777 00000B29 A2[54420100]            	mov	[date_day], al
  1778 00000B2E B008                    	mov	al, CMOS_MONTH
  1779 00000B30 E81D500000              	call	CMOS_READ
  1780 00000B35 A2[55420100]            	mov	[date_month], al
  1781 00000B3A B009                    	mov	al, CMOS_YEAR
  1782 00000B3C E811500000              	call	CMOS_READ
  1783 00000B41 A2[56420100]            	mov	[date_year], al
  1784 00000B46 B032                    	mov	al, CMOS_CENTURY
  1785 00000B48 E805500000              	call	CMOS_READ
  1786 00000B4D A2[57420100]            	mov	[date_century], al
  1787                                  	;
  1788 00000B52 B000                    	mov	al, CMOS_SECONDS
  1789 00000B54 E8F94F0000              	call 	CMOS_READ
  1790 00000B59 3A05[50420100]          	cmp	al, [time_seconds]
  1791 00000B5F 758A                    	jne	short time_of_day
  1792                                  
  1793                                  time_of_day_retn:
  1794 00000B61 C3                      	retn
  1795                                  
  1796                                  	; 15/01/2017
  1797                                  	; 10/06/2016
  1798                                  	; 07/06/2016
  1799                                  	; 06/06/2016
  1800                                  	; 23/05/2016
  1801                                  rtc_p:
  1802 00000B62 B101                    	mov	cl, 1 ; 15/01/2017
  1803 00000B64 EB02                    	jmp	short rtc_p0
  1804                                  u_timer: 
  1805                                  	; Timer Events with 18.2 Hz Timer Ticks
  1806                                  	; (and also timer events with RTC seconds)
  1807 00000B66 28C9                    	sub	cl, cl ; mov cl, 0 ; 15/01/2017
  1808                                  rtc_p0:
  1809                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1810                                  	; Major Modification:
  1811                                  	; Check and Perform Timer Events (for RTC)
  1812                                  	; 25/08/2014 - 07/09/2014
  1813                                  	; Retro UNIX 386 v1:
  1814                                   	; Print Real Time Clock content
  1815                                  	
  1816                                  	; 15/01/2017
  1817 00000B68 880D[744F0100]          	mov	byte [priority], cl ; 0 or 1 (not 2)
  1818 00000B6E 8A2D[774F0100]          	mov	ch, [timer_events]
  1819 00000B74 20ED                    	and	ch, ch
  1820 00000B76 7420                    	jz	short rtc_p3
  1821                                  
  1822 00000B78 BE[FC5D0100]            	mov	esi, timer_set  ; beginning address of
  1823                                  				; timer events space
  1824                                  rtc_p1:
  1825 00000B7D 8B06                    	mov	eax, [esi]	
  1826 00000B7F 20C0                    	and	al, al ; 0 = free, >0 = process no.
  1827 00000B81 7416                    	jz	short rtc_p4
  1828                                  	;
  1829 00000B83 C1C810                  	ror	eax, 16
  1830                                  	; ah = response value, al = interrupt type
  1831                                  	; 15/01/2017
  1832                                  	; cl = interrupt source
  1833                                  	;       1 = RTC, 0 = PIT  	 	
  1834 00000B86 38C8                    	cmp	al, cl 
  1835 00000B88 750A                    	jne	short rtc_p2 ; not as requested or undefined !
  1836 00000B8A 3C01                    	cmp	al, 1 ; 1 ; RTC interrupt ?
  1837 00000B8C 7410                    	je	short rtc_p5 ; yes, check for response
  1838                                  	; 06/06/2016 - 18.2 Hz Timer Ticks
  1839 00000B8E 836E080A                	sub	dword [esi+8], 10 ; 1 tick = 10
  1840 00000B92 7613                    	jna	short rtc_p6  ; continue for responding
  1841                                  rtc_p2:
  1842                                  	; 15/01/2017 (cl -> ch)
  1843                                  	; 07/06/2016
  1844 00000B94 FECD                    	dec	ch    ; remain count of timer events	
  1845 00000B96 7501                    	jnz	short rtc_p4
  1846                                  rtc_p3:	 
  1847 00000B98 C3                      	retn
  1848                                  rtc_p4:	
  1849                                  	;cmp	esi, timer_set + 240 ; 15*16 (last event)
  1850                                  	;jnb	short rtc_p3 ; end of timer event space
  1851 00000B99 83C610                  	add	esi, 16 ; next timer event
  1852 00000B9C EBDF                    	jmp	short rtc_p1
  1853                                  rtc_p5:	 
  1854                                  	; current timer count ; 06/06/2016 (182)
  1855 00000B9E 816E08B6000000          	sub	dword [esi+8], 182 ; 1 second (10*18.2)
  1856 00000BA5 77ED                    	ja	short rtc_p2  ; check for the next 
  1857                                  rtc_p6:	
  1858                                  	; it is the time of response! 
  1859 00000BA7 8B5E04                  	mov	ebx, [esi+4] ; set (count limit) value
  1860 00000BAA 895E08                  	mov	[esi+8], ebx ; reset count down value
  1861                                  			     ; to count limit
  1862                                  	; 19/12/2016
  1863                                  	; 10/12/2016 - timer callback modification
  1864 00000BAD 8B7E0C                  	mov	edi, [esi+12] ; response (or callback) address	
  1865 00000BB0 807E0100                	cmp	byte [esi+1], 0 ; >0 = callback
  1866 00000BB4 762A                    	jna	short rtc_p8
  1867                                  
  1868                                  	; timer callback !
  1869 00000BB6 0FB61E                  	movzx	ebx, byte [esi] ; process number (>0)
  1870 00000BB9 89D8                    	mov	eax, ebx
  1871 00000BBB C0E302                  	shl	bl, 2 ; *4
  1872 00000BBE 89BB[A85A0100]          	mov	[ebx+p.tcb-4], edi ; user's callback service addr
  1873 00000BC4 3A05[4F5D0100]          	cmp	al, [u.uno]
  1874 00000BCA 7521                    	jne	short rtc_p9
  1875 00000BCC 893D[6C5D0100]          	mov	[u.tcb], edi
  1876                                  rtc_p7:
  1877                                  	; 15/01/2017
  1878 00000BD2 B002                    	mov	al, 2
  1879 00000BD4 A2[744F0100]            	mov	[priority], al ; 2
  1880                                  	; 10/01/2017
  1881                                  	;mov	byte [u.pri], 2
  1882 00000BD9 A2[455D0100]            	mov	[u.pri], al ; 2
  1883 00000BDE EBB4                    	jmp	short rtc_p2
  1884                                  rtc_p8:
  1885                                  	; response address is physical address of
  1886                                  	; the program's response (signal return) byte
  1887                                  	; 06/06/2016
  1888                                  	;mov	edi, [esi+12] ; response address
  1889 00000BE0 8827                    	mov	[edi], ah     ; response value 
  1890                                  	;
  1891 00000BE2 C1C010                  	rol	eax, 16
  1892                                  	; 15/01/2017
  1893 00000BE5 3A05[4F5D0100]          	cmp	al, [u.uno] ; running process ?
  1894 00000BEB 74E5                    	je	short rtc_p7
  1895                                  rtc_p9:
  1896                                  	; al = process number  ; 10/06/2016
  1897 00000BED B202                    	mov	dl, 2 ; priority, 2 = event (high)	
  1898 00000BEF E808E60000              	call	set_run_sequence ; 19/05/2016
  1899 00000BF4 EB9E                    	jmp	short rtc_p2 ; 10/06/2016
  1900                                  
  1901                                  
  1902                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  1903                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  1904                                  default_irq7:
  1905 00000BF6 6650                    	push	ax
  1906 00000BF8 B00B                    	mov	al, 0Bh  ; In-Service register
  1907 00000BFA E620                    	out	20h, al
  1908 00000BFC EB00                            jmp short $+2
  1909 00000BFE EB00                    	jmp short $+2
  1910 00000C00 E420                    	in	al, 20h
  1911 00000C02 2480                    	and 	al, 80h ; bit 7 (is it real IRQ 7 or fake?)
  1912 00000C04 7404                            jz      short irq7_iret ; Fake (spurious) IRQ, do not send EOI 
  1913 00000C06 B020                            mov     al, 20h ; EOI
  1914 00000C08 E620                    	out	20h, al 
  1915                                  irq7_iret:
  1916 00000C0A 6658                    	pop	ax
  1917 00000C0C CF                      	iretd
  1918                                  	
  1919                                  bcd_to_ascii:
  1920                                  	; 25/08/2014
  1921                                  	; INPUT ->
  1922                                  	;	al = Packed BCD number
  1923                                  	; OUTPUT ->
  1924                                  	;	ax  = ASCII word/number
  1925                                  	;
  1926                                  	; Erdogan Tan - 1998 (proc_hex) - TRDOS.ASM (2004-2011)
  1927                                  	;
  1928 00000C0D D410                    	db 0D4h,10h                     ; Undocumented inst. AAM
  1929                                  					; AH = AL / 10h
  1930                                  					; AL = AL MOD 10h
  1931 00000C0F 660D3030                	or ax,'00'                      ; Make it ASCII based
  1932                                  
  1933 00000C13 86E0                            xchg ah, al 
  1934                                  	
  1935 00000C15 C3                      	retn	
  1936                                  	
  1937                                  
  1938                                  %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 00000C16 9C                  <1> 	pushfd	; 28/08/2014
    40 00000C17 0E                  <1> 	push 	cs
    41 00000C18 E801000000          <1> 	call 	KEYBOARD_IO_1 ; getc_int
    42 00000C1D 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 00000C1E 80642408BE          <1>         and     byte [esp+8], 10111110b ; clear zero flag and cary flag
   146                              <1> 	;
   147 00000C23 1E                  <1> 	push	ds			; SAVE CURRENT DS
   148 00000C24 53                  <1> 	push	ebx			; SAVE BX TEMPORARILY
   149                              <1> 	;push	ecx			; SAVE CX TEMPORARILY
   150 00000C25 66BB1000            <1>         mov     bx, KDATA 
   151 00000C29 8EDB                <1> 	mov	ds, bx			; PUT SEGMENT VALUE OF DATA AREA INTO DS
   152                              <1> 
   153                              <1> 	; 14/01/2017
   154 00000C2B 8B1C24              <1> 	mov	ebx, [esp]
   155                              <1> 	;; 15/01/2017
   156                              <1> 	; 02/01/2017
   157                              <1> 	;;mov	byte [intflg], 32h	; keyboard interrupt 
   158 00000C2E FB                  <1> 	sti
   159                              <1> 	;
   160                              <1> 
   161 00000C2F 08E4                <1> 	or	ah, ah			; CHECK FOR (AH)= 00H
   162 00000C31 743A                <1> 	jz	short _K1		; ASCII_READ
   163 00000C33 FECC                <1> 	dec	ah                      ; CHECK FOR (AH)= 01H
   164 00000C35 7453                <1>         jz      short _K2               ; ASCII_STATUS
   165 00000C37 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 02H
   166 00000C39 0F8494000000        <1>         jz      _K3                     ; SHIFT STATUS
   167 00000C3F FECC                <1> 	dec	ah			; CHECK FOR (AH)= 03H	
   168 00000C41 0F8493000000        <1>         jz      _K300                   ; SET TYPAMATIC RATE/DELAY
   169 00000C47 80EC02              <1> 	sub	ah, 2			; CHECK FOR (AH)= 05H	
   170 00000C4A 0F84BC000000        <1>         jz      _K500                   ; KEYBOARD WRITE         
   171                              <1> _KIO1:	
   172 00000C50 80EC0B              <1> 	sub	ah, 11			; AH =  10H
   173 00000C53 740C                <1> 	jz	short _K1E		; EXTENDED ASCII READ
   174 00000C55 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 11H
   175 00000C57 7422                <1> 	jz	short _K2E		; EXTENDED_ASCII_STATUS
   176 00000C59 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 12H
   177 00000C5B 7458                <1> 	jz	short _K3E		; EXTENDED_SHIFT_STATUS
   178                              <1> _KIO_EXIT:
   179                              <1> 	; 02/01/2017
   180 00000C5D FA                  <1> 	cli
   181                              <1> 	;;mov	byte [intflg], 0 ;; 15/01/2017
   182                              <1> 	;
   183                              <1> 	;pop	ecx			; RECOVER REGISTER
   184 00000C5E 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   185 00000C5F 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   186 00000C60 CF                  <1> 	iretd				; INVALID COMMAND, EXIT
   187                              <1> 
   188                              <1> 	;-----	ASCII CHARACTER
   189                              <1> _K1E:	
   190 00000C61 E8D3000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER (EXTENDED)
   191 00000C66 E848010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   192 00000C6B EBF0                <1> 	jmp	short _KIO_EXIT         ; GIVE IT TO THE CALLER
   193                              <1> _K1:	
   194 00000C6D E8C7000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER
   195 00000C72 E847010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   196 00000C77 72F4                <1> 	jc	short _K1		; CARRY SET MEANS TROW CODE AWAY
   197                              <1> _K1A:
   198 00000C79 EBE2                <1> 	jmp	short _KIO_EXIT         ; RETURN TO CALLER
   199                              <1> 
   200                              <1> 	;-----	ASCII STATUS
   201                              <1> _K2E:	
   202 00000C7B E804010000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER (EXTENDED)
   203 00000C80 7420                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   204 00000C82 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   205 00000C83 E82B010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   206 00000C88 EB17                <1> 	jmp	short _K2A	        ; GIVE IT TO THE CALLER
   207                              <1> _K2:	
   208 00000C8A E8F5000000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER
   209 00000C8F 7411                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   210 00000C91 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   211 00000C92 E827010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   212 00000C97 7308                <1> 	jnc	short _K2A	        ; CARRY CLEAR MEANS PASS VALID CODE
   213 00000C99 9D                  <1> 	popf				; INVALID CODE FOR THIS TYPE OF CALL
   214 00000C9A E89A000000          <1> 	call	_K1S			; THROW THE CHARACTER AWAY
   215 00000C9F EBE9                <1> 	jmp	short _K2		; GO LOOK FOR NEXT CHAR, IF ANY
   216                              <1> _K2A:
   217 00000CA1 9D                  <1> 	popf				; RESTORE ZF FROM TEST
   218                              <1> _K2B:
   219                              <1> 	; 02/01/2017
   220 00000CA2 FA                  <1> 	cli
   221                              <1> 	;; mov	byte [intflg], 0 ;; 15/01/2017
   222                              <1> 	;
   223                              <1> 	;pop	ecx			; RECOVER REGISTER
   224 00000CA3 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   225 00000CA4 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   226                              <1> 	; (*) 29/05/2016
   227                              <1> 	; (*) retf 4			; THROW AWAY (e)FLAGS
   228 00000CA5 7208                <1> 	jc	short _k2d
   229 00000CA7 7505                <1> 	jnz	short _k2c
   230 00000CA9 804C240840          <1> 	or	byte [esp+8], 01000000b	; set zero flag bit of eflags register
   231                              <1> _k2c:
   232 00000CAE 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 00000CAF 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 00000CB4 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 00000CB5 8A25[EE5D0000]      <1> 	mov	ah, [KB_FLAG_1]		; GET SYSTEM SHIFT KEY STATUS
   266 00000CBB 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 00000CBE C0E405              <1>         shl	ah, 5
   270 00000CC1 A0[EE5D0000]        <1> 	mov	al, [KB_FLAG_1]		; GET SYSTEM SHIFT STATES BACK
   271 00000CC6 2473                <1> 	and	al, 01110011b		; ELIMINATE SYS SHIFT, HOLD_STATE AND INS_SHIFT
   272 00000CC8 08C4                <1> 	or	ah, al                  ; MERGE REMAINING BITS INTO AH
   273 00000CCA A0[F05D0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT CTL AND ALT
   274 00000CCF 240C                <1> 	and	al, 00001100b		; ELIMINATE LC_E0 AND LC_E1
   275 00000CD1 08C4                <1> 	or	ah, al			; OR THE SHIFT FLAGS TOGETHER
   276                              <1> _K3:
   277 00000CD3 A0[ED5D0000]        <1> 	mov	al, [KB_FLAG]		; GET THE SHIFT STATUS FLAGS
   278                              <1> 	;jmp	short _KIO_EXIT		; RETURN TO CALLER
   279 00000CD8 EB83                <1> 	jmp	_KIO_EXIT
   280                              <1> 
   281                              <1> 	;-----	SET TYPAMATIC RATE AND DELAY
   282                              <1> _K300:
   283 00000CDA 3C05                <1> 	cmp	al, 5			; CORRECT FUNCTION CALL?
   284                              <1> 	;jne	short _KIO_EXIT		; NO, RETURN
   285 00000CDC 0F857BFFFFFF        <1>      	jne	_KIO_EXIT
   286 00000CE2 F6C3E0              <1> 	test	bl, 0E0h		; TEST FOR OUT-OF-RANGE RATE
   287 00000CE5 0F8572FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   288 00000CEB F6C7FC              <1> 	test	BH, 0FCh		; TEST FOR OUT-OF-RANGE DELAY
   289 00000CEE 0F8569FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   290 00000CF4 B0F3                <1> 	mov	al, KB_TYPA_RD		; COMMAND FOR TYPAMATIC RATE/DELAY		
   291 00000CF6 E8DA060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   292                              <1> 	;mov	cx, 5			; SHIFT COUNT
   293                              <1> 	;shl	bh, cl			; SHIFT DELAY OVER
   294 00000CFB C0E705              <1> 	shl	bh, 5
   295 00000CFE 88D8                <1> 	mov	al, bl			; PUT IN RATE
   296 00000D00 08F8                <1> 	or	al, bh			; AND DELAY
   297 00000D02 E8CE060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   298 00000D07 E951FFFFFF          <1>         jmp     _KIO_EXIT               ; RETURN TO CALLER
   299                              <1> 
   300                              <1> 	;-----	WRITE TO KEYBOARD BUFFER
   301                              <1> _K500:
   302 00000D0C 56                  <1> 	push	esi			; SAVE SI (esi)
   303 00000D0D FA                  <1> 	cli				; 
   304 00000D0E 8B1D[FE5D0000]      <1>      	mov	ebx, [BUFFER_TAIL]	; GET THE 'IN TO' POINTER TO THE BUFFER
   305 00000D14 89DE                <1> 	mov	esi, ebx		; SAVE A COPY IN CASE BUFFER NOT FULL
   306 00000D16 E8D3000000          <1> 	call	_K4			; BUMP THE POINTER TO SEE IF BUFFER IS FULL
   307 00000D1B 3B1D[FA5D0000]      <1> 	cmp	ebx, [BUFFER_HEAD]	; WILL THE BUFFER OVERRUN IF WE STORE THIS?
   308 00000D21 740D                <1> 	je	short _K502		; YES - INFORM CALLER OF ERROR		
   309 00000D23 66890E              <1> 	mov	[esi], cx		; NO - PUT ASCII/SCAN CODE INTO BUFFER	
   310 00000D26 891D[FE5D0000]      <1> 	mov	[BUFFER_TAIL], ebx	; ADJUST 'IN TO' POINTER TO REFLECT CHANGE
   311 00000D2C 28C0                <1> 	sub	al, al			; TELL CALLER THAT OPERATION WAS SUCCESSFUL
   312 00000D2E EB02                <1> 	jmp	short _K504		; SUB INSTRUCTION ALSO RESETS CARRY FLAG
   313                              <1> _K502:
   314 00000D30 B001                <1> 	mov	al, 01h			; BUFFER FULL INDICATION
   315                              <1> _K504:
   316 00000D32 FB                  <1> 	sti				
   317 00000D33 5E                  <1> 	pop	esi			; RECOVER SI (esi)
   318 00000D34 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 00000D39 FA                  <1> 	cli	; 03/12/2014
   323 00000D3A 8B1D[FA5D0000]      <1>         mov     ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   324 00000D40 3B1D[FE5D0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   325                              <1> 	;jne	short _K1U		; IF ANYTHING IN BUFFER SKIP INTERRUPT
   326 00000D46 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 00000D48 FB                  <1> 	sti				; INTERRUPTS BACK ON DURING LOOP
   335 00000D49 90                  <1> 	nop				; ALLOW AN INTERRUPT TO OCCUR
   336                              <1> _K1U:	
   337 00000D4A FA                  <1> 	cli				; INTERRUPTS BACK OFF
   338 00000D4B 8B1D[FA5D0000]      <1>         mov    	ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   339 00000D51 3B1D[FE5D0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   340                              <1> _k1x:
   341 00000D57 53                  <1> 	push	ebx			; SAVE ADDRESS		
   342 00000D58 9C                  <1> 	pushf				; SAVE FLAGS
   343 00000D59 E82F070000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   344 00000D5E 8A1D[EF5D0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   345 00000D64 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   346 00000D66 80E307              <1> 	and	bl, 07h	; KB_LEDS	; ISOLATE INDICATOR BITS
   347 00000D69 7406                <1> 	jz	short _K1V		; IF NO CHANGE BYPASS UPDATE
   348 00000D6B E8C9060000          <1> 	call	SND_LED1
   349 00000D70 FA                  <1> 	cli				; DISABLE INTERRUPTS
   350                              <1> _K1V:
   351 00000D71 9D                  <1> 	popf				; RESTORE FLAGS
   352 00000D72 5B                  <1> 	pop	ebx			; RESTORE ADDRESS
   353 00000D73 74D3                <1>         je      short _K1T              ; LOOP UNTIL SOMETHING IN BUFFER
   354                              <1> 	;
   355 00000D75 668B03              <1> 	mov	ax, [ebx] 		; GET SCAN CODE AND ASCII CODE
   356 00000D78 E871000000          <1>         call    _K4                     ; MOVE POINTER TO NEXT POSITION
   357 00000D7D 891D[FA5D0000]      <1>         mov     [BUFFER_HEAD], ebx      ; STORE VALUE IN VARIABLE
   358 00000D83 C3                  <1> 	retn				; RETURN
   359                              <1> 
   360                              <1> 	;-----	READ THE KEY TO SEE IF ONE IS PRESENT -----
   361                              <1> _K2S:
   362 00000D84 FA                  <1> 	cli				; INTERRUPTS OFF
   363 00000D85 8B1D[FA5D0000]      <1>         mov     ebx, [BUFFER_HEAD]      ; GET HEAD POINTER
   364 00000D8B 3B1D[FE5D0000]      <1>         cmp     ebx, [BUFFER_TAIL]      ; IF EQUAL (Z=1) THEN NOTHING THERE
   365 00000D91 668B03              <1> 	mov	ax, [ebx]
   366 00000D94 9C                  <1> 	pushf				; SAVE FLAGS
   367 00000D95 6650                <1> 	push	ax			; SAVE CODE
   368 00000D97 E8F1060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   369 00000D9C 8A1D[EF5D0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   370 00000DA2 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   371 00000DA4 80E307              <1> 	and	bl, 07h ; KB_LEDS	; ISOLATE INDICATOR BITS
   372 00000DA7 7405                <1> 	jz	short _K2T		; IF NO CHANGE BYPASS UPDATE
   373 00000DA9 E874060000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   374                              <1> _K2T:
   375 00000DAE 6658                <1> 	pop	ax			; RESTORE CODE
   376 00000DB0 9D                  <1> 	popf				; RESTORE FLAGS
   377 00000DB1 FB                  <1> 	sti				; INTERRUPTS BACK ON
   378 00000DB2 C3                  <1> 	retn				; RETURN
   379                              <1> 
   380                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR EXTENDED CALLS -----
   381                              <1> _KIO_E_XLAT:
   382 00000DB3 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   383 00000DB5 7506                <1> 	jne	short _KIO_E_RET	; NO, PASS IT ON
   384 00000DB7 08E4                <1>         or 	ah, ah			; AH = 0 IS SPECIAL CASE
   385 00000DB9 7402                <1>         jz	short _KIO_E_RET        ; PASS THIS ON UNCHANGED
   386 00000DBB 30C0                <1> 	xor	al, al			; OTHERWISE SET AL = 0
   387                              <1> _KIO_E_RET:				
   388 00000DBD C3                  <1> 	retn				; GO BACK
   389                              <1> 
   390                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR STANDARD CALLS -----
   391                              <1> _KIO_S_XLAT:
   392 00000DBE 80FCE0              <1> 	cmp	ah, 0E0h		; IS IT KEYPAD ENTER OR / ?
   393 00000DC1 750F                <1> 	jne	short _KIO_S2		; NO, CONTINUE
   394 00000DC3 3C0D                <1> 	cmp	al, 0Dh			; KEYPAD ENTER CODE?
   395 00000DC5 7408                <1>         je	short _KIO_S1		; YES, MASSAGE A BIT
   396 00000DC7 3C0A                <1> 	cmp	al, 0Ah			; CTRL KEYPAD ENTER CODE?
   397 00000DC9 7404                <1>         je	short _KIO_S1		; YES, MASSAGE THE SAME
   398 00000DCB B435                <1> 	mov	ah, 35h			; NO, MUST BE KEYPAD /
   399                              <1> _kio_ret: ; 03/12/2014
   400 00000DCD F8                  <1> 	clc
   401 00000DCE C3                  <1> 	retn
   402                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   403                              <1> _KIO_S1:				
   404 00000DCF B41C                <1> 	mov	ah, 1Ch			; CONVERT TO COMPATIBLE OUTPUT
   405                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   406 00000DD1 C3                  <1> 	retn
   407                              <1> _KIO_S2:		
   408 00000DD2 80FC84              <1> 	cmp	ah, 84h			; IS IT ONE OF EXTENDED ONES?
   409 00000DD5 7715                <1> 	ja	short _KIO_DIS		; YES, THROW AWAY AND GET ANOTHER CHAR
   410 00000DD7 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   411 00000DD9 7506                <1>         jne	short _KIO_S3		; NO, TRY LAST TEST
   412 00000DDB 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   413 00000DDD 740C                <1>         jz	short _KIO_USE		; PASS THIS ON UNCHANGED
   414 00000DDF EB0B                <1> 	jmp	short _KIO_DIS		; THROW AWAY THE REST
   415                              <1> _KIO_S3:
   416 00000DE1 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 00000DE3 75E8                <1> 	jne	short _kio_ret
   419 00000DE5 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   420 00000DE7 7402                <1>         jz	short _KIO_USE		; JUMP IF AH = 0
   421 00000DE9 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 00000DEB C3                  <1> 	retn				; RETURN	
   426                              <1> _KIO_DIS:
   427 00000DEC F9                  <1> 	stc				; SET CARRY TO INDICATE DISCARD CODE
   428 00000DED C3                  <1> 	retn				; RETURN
   429                              <1> 
   430                              <1> 	;-----	INCREMENT BUFFER POINTER ROUTINE -----
   431                              <1> _K4:    
   432 00000DEE 43                  <1> 	inc     ebx
   433 00000DEF 43                  <1> 	inc	ebx			; MOVE TO NEXT WORD IN LIST
   434 00000DF0 3B1D[F65D0000]      <1>         cmp     ebx, [BUFFER_END] 	; AT END OF BUFFER?
   435                              <1>         ;jne    short _K5               ; NO, CONTINUE
   436 00000DF6 7206                <1> 	jb	short _K5
   437 00000DF8 8B1D[F25D0000]      <1>         mov     ebx, [BUFFER_START]     ; YES, RESET TO BUFFER BEGINNING
   438                              <1> _K5:
   439 00000DFE 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 00000DFF FB                  <1> 	sti				; ENABLE INTERRUPTS
   549                              <1> 	;push	ebp
   550 00000E00 50                  <1> 	push	eax
   551 00000E01 53                  <1> 	push	ebx
   552 00000E02 51                  <1> 	push	ecx
   553 00000E03 52                  <1> 	push	edx
   554 00000E04 56                  <1> 	push	esi
   555 00000E05 57                  <1> 	push	edi
   556 00000E06 1E                  <1> 	push	ds
   557 00000E07 06                  <1> 	push	es
   558 00000E08 FC                  <1> 	cld				; FORWARD DIRECTION
   559 00000E09 66B81000            <1> 	mov	ax, KDATA
   560 00000E0D 8ED8                <1> 	mov	ds, ax
   561 00000E0F 8EC0                <1> 	mov	es, ax
   562                              <1> 	;
   563                              <1> 	;-----	WAIT FOR KEYBOARD DISABLE COMMAND TO BE ACCEPTED
   564 00000E11 B0AD                <1> 	mov	al, DIS_KBD		; DISABLE THE KEYBOARD COMMAND
   565 00000E13 E8A9050000          <1> 	call	SHIP_IT			; EXECUTE DISABLE
   566 00000E18 FA                  <1> 	cli				; DISABLE INTERRUPTS
   567 00000E19 B900000100          <1> 	mov	ecx, 10000h		; SET MAXIMUM TIMEOUT
   568                              <1> KB_INT_01:
   569 00000E1E E464                <1> 	in	al, STATUS_PORT		; READ ADAPTER STATUS
   570 00000E20 A802                <1> 	test	al, INPT_BUF_FULL	; CHECK INPUT BUFFER FULL STATUS BIT
   571 00000E22 E0FA                <1> 	loopnz	KB_INT_01		; WAIT FOR COMMAND TO BE ACCEPTED
   572                              <1> 	;
   573                              <1> 	;-----	READ CHARACTER FROM KEYBOARD INTERFACE
   574 00000E24 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 00000E26 FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
   588 00000E27 3CFE                <1> 	cmp	al, KB_RESEND		; IS THE INPUT A RESEND
   589 00000E29 7411                <1>         je      short KB_INT_4          ; GO IF RESEND
   590                              <1> 	;
   591                              <1> 	;-----	CHECK FOR RESPONSE TO A COMMAND TO KEYBOARD
   592 00000E2B 3CFA                <1> 	cmp	al, KB_ACK		; IS THE INPUT AN ACKNOWLEDGE
   593 00000E2D 751A                <1>         jne     short KB_INT_2          ; GO IF NOT
   594                              <1> 	;
   595                              <1> 	;-----	A COMMAND TO THE KEYBOARD WAS ISSUED
   596 00000E2F FA                  <1> 	cli				; DISABLE INTERRUPTS
   597 00000E30 800D[EF5D0000]10    <1> 	or	byte [KB_FLAG_2], KB_FA ; INDICATE ACK RECEIVED
   598 00000E37 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 00000E3C FA                  <1> 	cli				; DISABLE INTERRUPTS
   603 00000E3D 800D[EF5D0000]20    <1> 	or	byte [KB_FLAG_2], KB_FE ; INDICATE RESEND RECEIVED
   604 00000E44 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 00000E49 6650                <1> 	push 	ax			; SAVE DATA IN
   609 00000E4B E83D060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   610 00000E50 8A1D[EF5D0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   611 00000E56 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   612 00000E58 80E307              <1> 	and	bl, KB_LEDS		; ISOLATE INDICATOR BITS
   613 00000E5B 7405                <1> 	jz	short UP0		; IF NO CHANGE BYPASS UPDATE
   614 00000E5D E8C0050000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   615                              <1> UP0:
   616 00000E62 6658                <1> 	pop	ax			; RESTORE DATA IN
   617                              <1> ;------------------------------------------------------------------------
   618                              <1> ;	START OF KEY PROCESSING						;
   619                              <1> ;------------------------------------------------------------------------
   620 00000E64 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE IN AH ALSO
   621                              <1> 	;
   622                              <1> 	;-----	TEST FOR OVERRUN SCAN CODE FROM KEYBOARD
   623 00000E66 3CFF                <1> 	cmp	al, KB_OVER_RUN		; IS THIS AN OVERRUN CHAR
   624 00000E68 0F843F050000        <1>         je      K62			; BUFFER_FULL_BEEP
   625                              <1> 	;
   626                              <1> K16:	
   627 00000E6E 8A3D[F05D0000]      <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 00000E74 F6C7C0              <1> 	test 	bh, RD_ID+LC_AB 	; ARE WE DOING A READ ID?
   631 00000E77 7449                <1> 	jz	short NOT_ID		; CONTINUE IF NOT
   632 00000E79 7917                <1> 	jns	short TST_ID_2		; IS THE RD_ID FLAG ON?
   633 00000E7B 3CAB                <1> 	cmp	al, ID_1		; IS THIS THE 1ST ID CHARACTER?
   634 00000E7D 7507                <1> 	jne	short RST_RD_ID
   635 00000E7F 800D[F05D0000]40    <1> 	or	byte [KB_FLAG_3], LC_AB ; INDICATE 1ST ID WAS OK
   636                              <1> RST_RD_ID:
   637 00000E86 8025[F05D0000]7F    <1> 	and	byte [KB_FLAG_3], ~RD_ID ; RESET THE READ ID FLAG
   638                              <1>         ;jmp    short ID_EX		; AND EXIT
   639 00000E8D E924020000          <1> 	jmp	K26
   640                              <1> 	;
   641                              <1> TST_ID_2:
   642 00000E92 8025[F05D0000]BF    <1> 	and	byte [KB_FLAG_3], ~LC_AB ; RESET FLAG
   643 00000E99 3C54                <1> 	cmp	al, ID_2A		; IS THIS THE 2ND ID CHARACTER?
   644 00000E9B 7419                <1>         je	short KX_BIT		; JUMP IF SO
   645 00000E9D 3C41                <1> 	cmp	al, ID_2		; IS THIS THE 2ND ID CHARACTER?
   646                              <1>         ;jne	short ID_EX		; LEAVE IF NOT
   647 00000E9F 0F8511020000        <1> 	jne	K26
   648                              <1> 	;
   649                              <1> 	;-----	A READ ID SAID THAT IT WAS ENHANCED KEYBOARD
   650 00000EA5 F6C720              <1> 	test	bh, SET_NUM_LK 		; SHOULD WE SET NUM LOCK?
   651 00000EA8 740C                <1>         jz      short KX_BIT		; EXIT IF NOT
   652 00000EAA 800D[ED5D0000]20    <1> 	or	byte [KB_FLAG], NUM_STATE ; FORCE NUM LOCK ON
   653 00000EB1 E86C050000          <1> 	call	SND_LED			; GO SET THE NUM LOCK INDICATOR
   654                              <1> KX_BIT:
   655 00000EB6 800D[F05D0000]10    <1> 	or	byte [KB_FLAG_3], KBX	; INDICATE ENHANCED KEYBOARD WAS FOUND
   656 00000EBD E9F4010000          <1> ID_EX:	jmp     K26			; EXIT
   657                              <1> 	;
   658                              <1> NOT_ID:
   659 00000EC2 3CE0                <1> 	cmp	al, MC_E0		; IS THIS THE GENERAL MARKER CODE?
   660 00000EC4 750C                <1> 	jne	short TEST_E1
   661 00000EC6 800D[F05D0000]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 00000ECD E9EB010000          <1> 	jmp	K26A	
   664                              <1> TEST_E1:	
   665 00000ED2 3CE1                <1> 	cmp	al, MC_E1		; IS THIS THE PAUSE KEY?
   666 00000ED4 750C                <1> 	jne	short NOT_HC
   667 00000ED6 800D[F05D0000]11    <1> 	or	byte [KB_FLAG_3], LC_E1+KBX ; SET FLAG BIT, SET KBX, AND
   668 00000EDD E9DB010000          <1> EXIT:	jmp	K26A			; THROW AWAY THIS CODE
   669                              <1> 	;
   670                              <1> NOT_HC:
   671 00000EE2 247F                <1> 	and	al, 07Fh		; TURN OFF THE BREAK BIT
   672 00000EE4 F6C702              <1> 	test	bh, LC_E0		; LAST CODE THE E0 MARKER CODE
   673 00000EE7 7414                <1> 	jz	short NOT_LC_E0		; JUMP IF NOT
   674                              <1> 	;
   675 00000EE9 BF[DA5C0000]        <1> 	mov	edi, _K6+6		; IS THIS A SHIFT KEY?
   676 00000EEE AE                  <1> 	scasb
   677 00000EEF 0F84C1010000        <1>         je      K26 ; K16B              ; YES, THROW AWAY & RESET FLAG
   678 00000EF5 AE                  <1> 	scasb
   679 00000EF6 757C                <1> 	jne	short K16A		; NO, CONTINUE KEY PROCESSING
   680                              <1> 	;jmp	short K16B		; YES, THROW AWAY & RESET FLAG
   681 00000EF8 E9B9010000          <1> 	jmp	K26
   682                              <1> 	;
   683                              <1> NOT_LC_E0:
   684 00000EFD F6C701              <1> 	test	bh, LC_E1		; LAST CODE THE E1 MARKER CODE?
   685 00000F00 7435                <1> 	jz	short T_SYS_KEY		; JUMP IF NOT
   686 00000F02 B904000000          <1> 	mov	ecx, 4			; LENGHT OF SEARCH
   687 00000F07 BF[D85C0000]        <1> 	mov	edi, _K6+4		; IS THIS AN ALT, CTL, OR SHIFT?
   688 00000F0C F2AE                <1> 	repne	scasb			; CHECK IT
   689                              <1> 	;je	short EXIT		; THROW AWAY IF SO
   690 00000F0E 0F84A9010000        <1> 	je	K26A			
   691                              <1> 	;
   692 00000F14 3C45                <1> 	cmp	al, NUM_KEY		; IS IT THE PAUSE KEY?
   693                              <1> 	;jne	short K16B		; NO, THROW AWAY & RESET FLAG
   694 00000F16 0F859A010000        <1> 	jne	K26
   695 00000F1C F6C480              <1> 	test	ah, 80h			; YES, IS IT THE BREAK OF THE KEY?
   696                              <1> 	;jnz	short K16B		; YES, THROW THIS AWAY, TOO	
   697 00000F1F 0F8591010000        <1> 	jnz	K26
   698                              <1>         ; 20/02/2015 
   699 00000F25 F605[EE5D0000]08    <1> 	test	byte [KB_FLAG_1],HOLD_STATE ;  NO, ARE WE PAUSED ALREADY?
   700                              <1> 	;jnz	short K16B		;  YES, THROW AWAY
   701 00000F2C 0F8584010000        <1> 	jnz	K26
   702 00000F32 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 00000F37 3C54                <1> 	cmp	al, SYS_KEY		; IS IT THE SYSTEM KEY?
   707 00000F39 7539                <1> 	jnz	short K16A		; CONTINUE IF NOT
   708                              <1> 	;
   709 00000F3B F6C480              <1> 	test	ah, 80h			; CHECK IF THIS A BREAK CODE
   710 00000F3E 7524                <1> 	jnz	short K16C		; DO NOT TOUCH SYSTEM INDICATOR IF TRUE
   711                              <1> 	;
   712 00000F40 F605[EE5D0000]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 00000F47 0F8569010000        <1> 	jnz     K26			
   715                              <1> 	;
   716 00000F4D 800D[EE5D0000]04    <1> 	or	byte [KB_FLAG_1], SYS_SHIFT ; INDICATE SYSTEM KEY DEPRESSED
   717 00000F54 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   718 00000F56 E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   719                              <1> 					; INTERRUPT-RETURN-NO-EOI
   720 00000F58 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   721 00000F5A 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 00000F5F E965010000          <1>         jmp     K27A                    ; END PROCESSING
   727                              <1> 	;
   728                              <1> ;K16B:	jmp	K26			; IGNORE SYSTEM KEY
   729                              <1> 	;
   730                              <1> K16C:
   731 00000F64 8025[EE5D0000]FB    <1> 	and	byte [KB_FLAG_1], ~SYS_SHIFT ; TURN OFF SHIFT KEY HELD DOWN
   732 00000F6B B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   733 00000F6D 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 00000F6F E94E010000          <1> 	jmp     K27			; IGNORE SYSTEM KEY
   744                              <1> 	;
   745                              <1> 	;-----	TEST FOR SHIFT KEYS
   746                              <1> K16A:
   747 00000F74 8A1D[ED5D0000]      <1> 	mov	bl, [KB_FLAG]		; PUT STATE FLAGS IN BL
   748 00000F7A BF[D45C0000]        <1> 	mov	edi, _K6		; SHIFT KEY TABLE offset
   749 00000F7F B908000000          <1> 	mov	ecx, _K6L		; LENGTH
   750 00000F84 F2AE                <1> 	repne	scasb			; LOOK THROUGH THE TABLE FOR A MATCH
   751 00000F86 88E0                <1> 	mov	al, ah			; RECOVER SCAN CODE
   752 00000F88 0F8510010000        <1>         jne     K25                     ; IF NO MATCH, THEN SHIFT NOT FOUND
   753                              <1> 	;
   754                              <1> 	;------	SHIFT KEY FOUND
   755                              <1> K17:
   756 00000F8E 81EF[D55C0000]      <1>         sub     edi, _K6+1              ; ADJUST PTR TO SCAN CODE MATCH
   757 00000F94 8AA7[DC5C0000]      <1>        	mov     ah, [edi+_K7]       	; GET MASK INTO AH
   758 00000F9A B102                <1> 	mov	cl, 2			; SETUP COUNT FOR FLAG SHIFTS
   759 00000F9C A880                <1> 	test	al, 80h			; TEST FOR BREAK KEY
   760 00000F9E 0F8596000000        <1>         jnz     K23                     ; JUMP OF BREAK
   761                              <1> 	;
   762                              <1> 	;-----	SHIFT MAKE FOUND, DETERMINE SET OR TOGGLE
   763                              <1> K17C:
   764 00000FA4 80FC10              <1> 	cmp	ah, SCROLL_SHIFT
   765 00000FA7 732B                <1> 	jae	short K18		; IF SCROLL SHIFT OR ABOVE, TOGGLE KEY
   766                              <1> 	;
   767                              <1> 	;-----	PLAIN SHIFT KEY, SET SHIFT ON
   768 00000FA9 0825[ED5D0000]      <1> 	or	[KB_FLAG], ah		; TURN ON SHIFT BIT
   769 00000FAF A80C                <1>         test	al, CTL_SHIFT+ALT_SHIFT ; IS IT ALT OR CTRL?
   770                              <1> 	;jnz	short K17D		; YES, MORE FLAGS TO SET
   771 00000FB1 0F84FF000000        <1> 	jz	K26			; NO, INTERRUPT RETURN
   772                              <1> K17D:
   773 00000FB7 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF NEW KEYS?
   774 00000FBA 740B                <1> 	jz 	short K17E		; NO, JUMP
   775 00000FBC 0825[F05D0000]      <1> 	or	[KB_FLAG_3], ah		; SET BITS FOR RIGHT CTRL, ALT
   776 00000FC2 E9EF000000          <1> 	jmp	K26			; INTERRUPT RETURN
   777                              <1> K17E:
   778 00000FC7 D2EC                <1> 	shr	ah, cl			; MOVE FLAG BITS TWO POSITIONS
   779 00000FC9 0825[EE5D0000]      <1> 	or	[KB_FLAG_1], ah		; SET BITS FOR LEFT CTRL, ALT
   780 00000FCF E9E2000000          <1> 	jmp	K26
   781                              <1> 	;
   782                              <1> 	;-----	TOGGLED SHIFT KEY, TEST FOR 1ST MAKE OR NOT
   783                              <1> K18:					; SHIFT-TOGGLE
   784 00000FD4 F6C304              <1> 	test	bl, CTL_SHIFT 		; CHECK CTL SHIFT STATE
   785                              <1>         ;jz    	short K18A              ; JUMP IF NOT CTL STATE
   786 00000FD7 0F85C1000000        <1>         jnz     K25                     ; JUMP IF CTL STATE
   787                              <1> K18A:
   788 00000FDD 3C52                <1> 	cmp	al, INS_KEY		; CHECK FOR INSERT KEY
   789 00000FDF 7524                <1> 	jne	short K22		; JUMP IF NOT INSERT KEY
   790 00000FE1 F6C308              <1> 	test	bl, ALT_SHIFT 		; CHECK FOR ALTERNATE SHIFT
   791                              <1>       	;jz	short K18B		; JUMP IF NOT ALTERNATE SHIFT	
   792 00000FE4 0F85B4000000        <1>         jnz     K25                     ; JUMP IF ALTERNATE SHIFT
   793                              <1> K18B:
   794 00000FEA F6C702              <1> 	test	bh, LC_E0 ;20/02/2015	; IS THIS NEW INSERT KEY?
   795 00000FED 7516                <1> 	jnz	short K22		; YES, THIS ONE'S NEVER A '0'
   796                              <1> K19:	
   797 00000FEF F6C320              <1> 	test	bl, NUM_STATE 		; CHECK FOR BASE STATE
   798 00000FF2 750C                <1> 	jnz	short K21		; JUMP IF NUM LOCK IS ON
   799 00000FF4 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST FOR SHIFT STATE
   800 00000FF7 740C                <1> 	jz	short K22		; JUMP IF BASE STATE
   801                              <1> K20:					; NUMERIC ZERO, NOT INSERT KEY
   802 00000FF9 88C4                <1> 	mov	ah, al			; PUT SCAN CODE BACK IN AH
   803 00000FFB E99E000000          <1>         jmp     K25                     ; NUMERAL '0', STNDRD. PROCESSING
   804                              <1> K21:					; MIGHT BE NUMERIC
   805 00001000 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT
   806 00001003 74F4                <1> 	jz	short K20		; IS NUMERIC, STD. PROC.
   807                              <1> 	;
   808                              <1> K22:					; SHIFT TOGGLE KEY HIT; PROCESS IT
   809 00001005 8425[EE5D0000]      <1> 	test	ah, [KB_FLAG_1] 	; IS KEY ALREADY DEPRESSED
   810 0000100B 0F85A5000000        <1>         jnz     K26                     ; JUMP IF KEY ALREADY DEPRESSED
   811                              <1> K22A:
   812 00001011 0825[EE5D0000]      <1>         or      [KB_FLAG_1], ah 	; INDICATE THAT THE KEY IS DEPRESSED
   813 00001017 3025[ED5D0000]      <1> 	xor	[KB_FLAG], ah		; TOGGLE THE SHIFT STATE
   814                              <1> 	;
   815                              <1> 	;-----	TOGGLE LED IF CAPS, NUM  OR SCROLL KEY DEPRESSED
   816 0000101D F6C470              <1> 	test	ah, CAPS_SHIFT+NUM_SHIFT+SCROLL_SHIFT ; SHIFT TOGGLE?
   817 00001020 7409                <1> 	jz	short K22B		; GO IF NOT
   818                              <1> 	;
   819 00001022 6650                <1> 	push	ax			; SAVE SCAN CODE AND SHIFT MASK
   820 00001024 E8F9030000          <1> 	call	SND_LED			; GO TURN MODE INDICATORS ON
   821 00001029 6658                <1> 	pop	ax			; RESTORE SCAN CODE
   822                              <1> K22B:
   823 0000102B 3C52                <1> 	cmp	al, INS_KEY		; TEST FOR 1ST MAKE OF INSERT KEY
   824 0000102D 0F8583000000        <1>         jne     K26                     ; JUMP IF NOT INSERT KEY
   825 00001033 88C4                <1> 	mov	ah, al		        ; SCAN CODE IN BOTH HALVES OF AX
   826 00001035 E999000000          <1>         jmp     K28                     ; FLAGS UPDATED, PROC. FOR BUFFER
   827                              <1> 	;
   828                              <1> 	;-----	BREAK SHIFT FOUND
   829                              <1> K23:					; BREAK-SHIFT-FOUND
   830 0000103A 80FC10              <1> 	cmp	ah, SCROLL_SHIFT	; IS THIS A TOGGLE KEY
   831 0000103D F6D4                <1> 	not	ah			; INVERT MASK
   832 0000103F 7355                <1> 	jae	short K24		; YES, HANDLE BREAK TOGGLE
   833 00001041 2025[ED5D0000]      <1> 	and	[KB_FLAG], ah		; TURN OFF SHIFT BIT
   834 00001047 80FCFB              <1> 	cmp	ah, ~CTL_SHIFT		; IS THIS ALT OR CTL?
   835 0000104A 7730                <1> 	ja	short K23D		; NO, ALL DONE
   836                              <1> 	;
   837 0000104C F6C702              <1> 	test	bh, LC_E0		; 2ND ALT OR CTL?
   838 0000104F 7408                <1> 	jz	short K23A		; NO, HANSLE NORMALLY
   839 00001051 2025[F05D0000]      <1> 	and 	[KB_FLAG_3], ah		; RESET BIT FOR RIGHT ALT OR CTL
   840 00001057 EB08                <1> 	jmp	short K23B		; CONTINUE
   841                              <1> K23A:
   842 00001059 D2FC                <1> 	sar	ah, cl			; MOVE THE MASK BIT TWO POSITIONS
   843 0000105B 2025[EE5D0000]      <1> 	and	[KB_FLAG_1], ah		; RESET BIT FOR LEFT ALT AND CTL
   844                              <1> K23B:
   845 00001061 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE
   846 00001063 A0[F05D0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT ALT & CTRL FLAGS
   847 00001068 D2E8                <1> 	shr	al, cl			; MOVE TO BITS 1 & 0
   848 0000106A 0A05[EE5D0000]      <1> 	or	al, [KB_FLAG_1]		; PUT IN LEFT ALT & CTL FLAGS
   849 00001070 D2E0                <1> 	shl	al, cl			; MOVE BACK TO BITS 3 & 2
   850 00001072 240C                <1> 	and	al, ALT_SHIFT+CTL_SHIFT ; FILTER OUT OTHER GARBAGE
   851 00001074 0805[ED5D0000]      <1> 	or	[KB_FLAG], al		; PUT RESULT IN THE REAL FLAGS	
   852 0000107A 88E0                <1> 	mov	al, ah
   853                              <1> K23D:
   854 0000107C 3CB8                <1> 	cmp	al, ALT_KEY+80h		; IS THIS ALTERNATE SHIFT RELEASE
   855 0000107E 7536                <1> 	jne	short K26		; INTERRUPT RETURN
   856                              <1> 	;	
   857                              <1> 	;-----	ALTERNATE SHIFT KEY RELEASED, GET THE VALUE INTO BUFFER
   858 00001080 A0[F15D0000]        <1> 	mov	al, [ALT_INPUT]
   859 00001085 B400                <1> 	mov	ah, 0			; SCAN CODE OF 0
   860 00001087 8825[F15D0000]      <1> 	mov	[ALT_INPUT], ah 	; ZERO OUT THE FIELD
   861 0000108D 3C00                <1> 	cmp	al, 0			; WAS THE INPUT = 0?
   862 0000108F 7425                <1> 	je	short K26		; INTERRUPT_RETURN
   863                              <1>         ; 29/01/2016
   864                              <1> 	;jmp     K61                    ; IT WASN'T, SO PUT IN BUFFER
   865 00001091 E9D0020000          <1> 	jmp	_K60
   866                              <1> 	;
   867                              <1> K24:					; BREAK-TOGGLE
   868 00001096 2025[EE5D0000]      <1> 	and	[KB_FLAG_1], ah 	; INDICATE NO LONGER DEPRESSED
   869 0000109C 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 0000109E 3C80                <1> 	cmp	al, 80h			; TEST FOR BREAK KEY
   875 000010A0 7314                <1> 	jae	short K26		; NOTHING FOR BREAK CHARS FROM HERE ON
   876 000010A2 F605[EE5D0000]08    <1> 	test	byte [KB_FLAG_1], HOLD_STATE ; ARE WE IN HOLD STATE
   877 000010A9 7428                <1> 	jz	short K28		; BRANCH AROUND TEST IF NOT
   878 000010AB 3C45                <1> 	cmp	al, NUM_KEY
   879 000010AD 7407                <1> 	je	short K26		; CAN'T END HOLD ON NUM_LOCK
   880 000010AF 8025[EE5D0000]F7    <1> 	and	byte [KB_FLAG_1], ~HOLD_STATE ; TURN OFF THE HOLD STATE BIT
   881                              <1> 	;
   882                              <1> K26:
   883 000010B6 8025[F05D0000]FC    <1> 	and	byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; RESET LAST CHAR H.C. FLAG
   884                              <1> K26A:					; INTERRUPT-RETURN
   885 000010BD FA                  <1> 	cli				; TURN OFF INTERRUPTS
   886 000010BE B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   887 000010C0 E620                <1> 	out	20h, al	;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   888                              <1> K27:					; INTERRUPT-RETURN-NO-EOI
   889 000010C2 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   890 000010C4 E8F8020000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
   891                              <1> K27A:
   892 000010C9 FA                  <1> 	cli				; DISABLE INTERRUPTS
   893                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017 ;; 15/01/2017
   894 000010CA 07                  <1> 	pop	es			; RESTORE REGISTERS
   895 000010CB 1F                  <1> 	pop	ds
   896 000010CC 5F                  <1> 	pop	edi
   897 000010CD 5E                  <1> 	pop	esi
   898 000010CE 5A                  <1> 	pop	edx
   899 000010CF 59                  <1> 	pop	ecx
   900 000010D0 5B                  <1> 	pop	ebx
   901 000010D1 58                  <1> 	pop	eax
   902                              <1> 	;pop	ebp
   903 000010D2 CF                  <1> 	iretd				; RETURN
   904                              <1> 
   905                              <1> 	;-----	NOT IN	HOLD STATE
   906                              <1> K28:					; NO-HOLD-STATE
   907 000010D3 3C58                <1> 	cmp	al, 88			; TEST FOR OUT-OF-RANGE SCAN CODES
   908 000010D5 77DF                <1> 	ja	short K26		; IGNORE IF OUT-OF-RANGE	
   909                              <1> 	;
   910 000010D7 F6C308              <1> 	test	bl, ALT_SHIFT 		; ARE WE IN ALTERNATE SHIFT
   911                              <1>         ;jz	short K28A		; IF NOT ALTERNATE
   912 000010DA 0F84F1000000        <1>         jz      K38
   913                              <1> 	;
   914 000010E0 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENCHANCED KEYBOARD?
   915 000010E3 740D                <1> 	jz	short K29		; NO, ALT STATE IS REAL
   916                              <1> 	 ;28/02/2015
   917 000010E5 F605[EE5D0000]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 000010EC 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 000010F2 F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT ALSO?
   926 000010F5 740B                <1> 	jz	short K31		; NO_RESET
   927 000010F7 3C53                <1> 	cmp	al, DEL_KEY		; CTL-ALT STATE, TEST FOR DELETE KEY
   928 000010F9 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 000010FB B0FE                <1> 	mov	al, SHUT_CMD		; SHUTDOWN COMMAND
   936 000010FD E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROL PORT
   937                              <1> khere:
   938 000010FF F4                  <1> 	hlt				; WAIT FOR 80286 RESET
   939 00001100 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 00001102 3C39                <1> 	cmp	al, 57			; TEST FOR SPACE KEY
   945 00001104 7507                <1> 	jne	short K311		; NOT THERE
   946 00001106 B020                <1> 	mov	al, ' '			; SET SPACE CHAR
   947 00001108 E948020000          <1>         jmp     K57                     ; BUFFER_FILL
   948                              <1> K311:
   949 0000110D 3C0F                <1> 	cmp	al, 15			; TEST FOR TAB KEY
   950 0000110F 7509                <1> 	jne	short K312		; NOT THERE
   951 00001111 66B800A5            <1> 	mov	ax, 0A500h		; SET SPECIAL CODE FOR ALT-TAB
   952 00001115 E93B020000          <1>         jmp     K57                     ; BUFFER_FILL
   953                              <1> K312:
   954 0000111A 3C4A                <1> 	cmp	al, 74			; TEST FOR KEY PAD -
   955 0000111C 0F84A2000000        <1>         je      K37B                    ; GO PROCESS
   956 00001122 3C4E                <1> 	cmp	al, 78			; TEST FOR KEY PAD +
   957 00001124 0F849A000000        <1>         je      K37B                    ; GO PROCESS
   958                              <1> 	;
   959                              <1> 	;-----	LOOK FOR KEY PAD ENTRY
   960                              <1> K32:					; ALT-KEY-PAD
   961 0000112A BF[B05C0000]        <1> 	mov	edi, K30		; ALT-INPUT-TABLE offset
   962 0000112F B90A000000          <1> 	mov	ecx, 10			; LOOK FOR ENTRY USING KEYPAD
   963 00001134 F2AE                <1> 	repne	scasb			; LOOK FOR MATCH
   964 00001136 7525                <1> 	jne	short K33		; NO_ALT_KEYPAD
   965 00001138 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF THE NEW KEYS?
   966 0000113B 0F858A000000        <1>         jnz     K37C                    ; YES, JUMP, NOT NUMPAD KEY
   967 00001141 81EF[B15C0000]      <1> 	sub	edi, K30+1		; DI NOW HAS ENTRY VALUE
   968 00001147 A0[F15D0000]        <1> 	mov	al, [ALT_INPUT] 	; GET THE CURRENT BYTE
   969 0000114C B40A                <1> 	mov	ah, 10			; MULTIPLY BY 10
   970 0000114E F6E4                <1> 	mul	ah
   971 00001150 6601F8              <1> 	add	ax, di			; ADD IN THE LATEST ENTRY
   972 00001153 A2[F15D0000]        <1> 	mov	[ALT_INPUT], al 	; STORE IT AWAY
   973                              <1> ;K32A:
   974 00001158 E959FFFFFF          <1>         jmp     K26                     ; THROW AWAY THAT KEYSTROKE
   975                              <1> 	;
   976                              <1> 	;-----	LOOK FOR SUPERSHIFT ENTRY
   977                              <1> K33:					; NO-ALT-KEYPAD
   978 0000115D C605[F15D0000]00    <1>         mov     byte [ALT_INPUT], 0     ; ZERO ANY PREVIOUS ENTRY INTO INPUT
   979 00001164 B91A000000          <1> 	mov	ecx, 26			; (DI),(ES) ALREADY POINTING
   980 00001169 F2AE                <1> 	repne	scasb			; LOOK FOR MATCH IN ALPHABET
   981 0000116B 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 0000116D 3C02                <1> 	cmp	al, 2			; KEY WITH '1' ON IT
   986 0000116F 7253                <1> 	jb	short K37B		; MUST BE ESCAPE
   987 00001171 3C0D                <1> 	cmp	al, 13			; IS IT IN THE REGION
   988 00001173 7705                <1> 	ja	short K35		; NO, ALT SOMETHING ELSE
   989 00001175 80C476              <1> 	add	ah, 118			; CONVERT PSEUDO SCAN CODE TO RANGE
   990 00001178 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 0000117A 3C57                <1> 	cmp	al, F11_M		; IS IT F11?	
   995 0000117C 7209                <1> 	jb	short K35A ; 20/02/2015	; NO, BRANCH
   996 0000117E 3C58                <1> 	cmp	al, F12_M		; IS IT F12?
   997 00001180 7705                <1> 	ja	short K35A ; 20/02/2015	; NO, BRANCH
   998 00001182 80C434              <1> 	add	ah, 52			; CONVERT TO PSEUDO SCAN CODE
   999 00001185 EB36                <1> 	jmp	short K37A		; GO FILL THE BUFFER
  1000                              <1> K35A:
  1001 00001187 F6C702              <1> 	test	bh, LC_E0		; DO WE HAVE ONE OF THE NEW KEYS?
  1002 0000118A 7422                <1> 	jz	short K37		; NO, JUMP
  1003 0000118C 3C1C                <1> 	cmp	al, 28			; TEST FOR KEYPAD ENTER
  1004 0000118E 7509                <1>         jne     short K35B              ; NOT THERE
  1005 00001190 66B800A6            <1> 	mov	ax, 0A600h		; SPECIAL CODE
  1006 00001194 E9BC010000          <1> 	jmp	K57			; BUFFER FILL
  1007                              <1> K35B:
  1008 00001199 3C53                <1> 	cmp	al, 83			; TEST FOR DELETE KEY
  1009 0000119B 742E                <1> 	je	short K37C		; HANDLE WITH OTHER EDIT KEYS
  1010 0000119D 3C35                <1> 	cmp	al, 53			; TEST FOR KEYPAD /
  1011                              <1> 	;jne	short K32A		; NOT THERE, NO OTHER E0 SPECIALS	
  1012 0000119F 0F8511FFFFFF        <1>         jne     K26
  1013 000011A5 66B800A4            <1> 	mov	ax, 0A400h		; SPECIAL CODE
  1014 000011A9 E9A7010000          <1> 	jmp	K57			; BUFFER FILL
  1015                              <1> K37:
  1016 000011AE 3C3B                <1> 	cmp	al, 59			; TEST FOR FUNCTION KEYS (F1)
  1017 000011B0 7212                <1>         jb      short K37B		; NO FN, HANDLE W/OTHER EXTENDED
  1018 000011B2 3C44                <1> 	cmp	al, 68			; IN KEYPAD REGION?
  1019                              <1>         ;ja	short K32A		; IF SO, IGNORE
  1020 000011B4 0F87FCFEFFFF        <1>         ja      K26
  1021 000011BA 80C42D              <1> 	add	ah, 45			; CONVERT TO PSEUDO SCAN CODE
  1022                              <1> K37A:
  1023 000011BD B000                <1> 	mov	al, 0			; ASCII CODE OF ZERO
  1024 000011BF E991010000          <1>         jmp     K57                     ; PUT IT IN THE BUFFER
  1025                              <1> K37B:
  1026 000011C4 B0F0                <1> 	mov	al, 0F0h		; USE SPECIAL ASCII CODE
  1027 000011C6 E98A010000          <1> 	jmp     K57                     ; PUT IT IN THE BUFFER
  1028                              <1> K37C:
  1029 000011CB 0450                <1> 	add	al, 80			; CONVERT SCAN CODE (EDIT KEYS)
  1030 000011CD 88C4                <1> 	mov	ah, al			; (SCAN CODE NOT IN AH FOR INSERT)
  1031 000011CF 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 000011D1 F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT?
  1037                              <1> 	;jnz	short K38A		; YES, START PROCESSING	
  1038 000011D4 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 000011DA 3C46                <1> 	cmp	al, SCROLL_KEY		; TEST FOR BREAK
  1044 000011DC 7531                <1> 	jne	short K39		; JUMP, NO-BREAK
  1045 000011DE F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1046 000011E1 7405                <1> 	jz	short K38B		; NO, BREAK IS VALID	
  1047 000011E3 F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1048 000011E6 7427                <1> 	jz	short K39		; NO-BREAK, TEST FOR PAUSE	
  1049                              <1> K38B:
  1050 000011E8 8B1D[FA5D0000]      <1> 	mov	ebx, [BUFFER_HEAD] 	; RESET BUFFER TO EMPTY
  1051 000011EE 891D[FE5D0000]      <1> 	mov	[BUFFER_TAIL], ebx
  1052 000011F4 C605[EC5D0000]80    <1> 	mov	byte [BIOS_BREAK], 80h  ; TURN ON BIOS_BREAK BIT
  1053                              <1> 	;
  1054                              <1> 	;-----	ENABLE KEYBOARD
  1055 000011FB B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1056 000011FD 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 00001202 E82F510000          <1> 	call	ctrlbrk ; control+break subroutine
  1062                              <1> 	;
  1063 00001207 6629C0              <1> 	sub	ax, ax			; PUT OUT DUMMY CHARACTER
  1064 0000120A E946010000          <1>         jmp     K57                     ; BUFFER_FILL
  1065                              <1> 	;
  1066                              <1> 	;-----	TEST FOR PAUSE
  1067                              <1> K39:					; NO_BREAK
  1068 0000120F F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1069 00001212 7537                <1> 	jnz	short K41		; YES, THEN THIS CAN'T BE PAUSE	
  1070 00001214 3C45                <1> 	cmp	al, NUM_KEY		; LOOK FOR PAUSE KEY
  1071 00001216 7533                <1> 	jne	short K41		; NO-PAUSE
  1072                              <1> K39P:
  1073 00001218 800D[EE5D0000]08    <1> 	or	byte [KB_FLAG_1], HOLD_STATE ; TURN ON THE HOLD FLAG
  1074                              <1> 	;
  1075                              <1> 	;-----	ENABLE KEYBOARD
  1076 0000121F B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1077 00001221 E89B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1078                              <1> K39A:
  1079 00001226 B020                <1> 	mov	al, EOI			; END OF INTERRUPT TO CONTROL PORT
  1080 00001228 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 0000122A 803D[225E0000]07    <1>         cmp     byte [CRT_MODE], 7      ; IS THIS BLACK AND WHITE CARD
  1084 00001231 740A                <1>         je      short K40              	; YES, NOTHING TO DO
  1085 00001233 66BAD803            <1> 	mov	dx, 03D8h		; PORT FOR COLOR CARD
  1086 00001237 A0[235E0000]        <1>         mov     al, [CRT_MODE_SET] 	; GET THE VALUE OF THE CURRENT MODE
  1087 0000123C EE                  <1> 	out	dx, al			; SET THE CRT MODE, SO THAT CRT IS ON
  1088                              <1> 	;
  1089                              <1> K40:					; PAUSE-LOOP
  1090 0000123D F605[EE5D0000]08    <1>         test    byte [KB_FLAG_1], HOLD_STATE ; CHECK HOLD STATE FLAG
  1091 00001244 75F7                <1> 	jnz	short K40		; LOOP UNTIL FLAG TURNED OFF
  1092                              <1> 	;
  1093 00001246 E977FEFFFF          <1>         jmp     K27                     ; INTERRUPT_RETURN_NO_EOI
  1094                              <1>         ;
  1095                              <1> 	;-----	TEST SPECIAL CASE KEY 55
  1096                              <1> K41:					; NO-PAUSE
  1097 0000124B 3C37                <1> 	cmp	al, 55			; TEST FOR */PRTSC KEY
  1098 0000124D 7513                <1> 	jne	short K42		; NOT-KEY-55
  1099 0000124F F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1100 00001252 7405                <1> 	jz	short K41A		; NO, CTL-PRTSC IS VALID	
  1101 00001254 F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1102 00001257 7421                <1> 	jz	short K42B		; NO, TRANSLATE TO A FUNCTION
  1103                              <1> K41A:	
  1104 00001259 66B80072            <1> 	mov	ax, 114*256		; START/STOP PRINTING SWITCH
  1105 0000125D E9F3000000          <1>         jmp     K57                     ; BUFFER_FILL
  1106                              <1> 	;
  1107                              <1> 	;-----	SET UP TO TRANSLATE CONTROL SHIFT
  1108                              <1> K42:					; NOT-KEY-55
  1109 00001262 3C0F                <1> 	cmp	al, 15			; IS IT THE TAB KEY?
  1110 00001264 7414                <1> 	je	short K42B		; YES, XLATE TO FUNCTION CODE
  1111 00001266 3C35                <1> 	cmp	al, 53			; IS IT THE / KEY?
  1112 00001268 750E                <1> 	jne	short K42A		; NO, NO MORE SPECIAL CASES	
  1113 0000126A F6C702              <1> 	test	bh, LC_E0		; YES, IS IT FROM THE KEY PAD?
  1114 0000126D 7409                <1> 	jz	short K42A		; NO, JUST TRANSLATE
  1115 0000126F 66B80095            <1> 	mov	ax, 9500h		; YES, SPECIAL CODE FOR THIS ONE
  1116 00001273 E9DD000000          <1> 	jmp	K57			; BUFFER FILL	
  1117                              <1> K42A: 
  1118                              <1> 	;;mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1119 00001278 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 0000127A BB[E45C0000]        <1> 	mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1125 0000127F 0F82AE000000        <1> 	jb	K56 ;; 20/02/2015	
  1126 00001285 E9B9000000          <1> 	jmp	K64	
  1127                              <1>         ;
  1128                              <1> 	;-----	NOT IN CONTROL SHIFT
  1129                              <1> K44:					; NOT-CTL-SHIFT
  1130 0000128A 3C37                <1> 	cmp	al, 55			; PRINT SCREEN KEY?
  1131 0000128C 7528                <1> 	jne	short K45		; NOT PRINT SCREEN
  1132 0000128E F6C710              <1> 	test	bh, KBX			; IS THIS ENHANCED KEYBOARD?
  1133 00001291 7407                <1> 	jz	short K44A		; NO, TEST FOR SHIFT STATE	
  1134 00001293 F6C702              <1> 	test	bh, LC_E0		; YES, LAST CODE A MARKER?
  1135 00001296 7507                <1> 	jnz	short K44B		; YES, IS PRINT SCREEN
  1136 00001298 EB41                <1> 	jmp	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1137                              <1> K44A:
  1138 0000129A F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; NOT 101 KBD, SHIFT KEY DOWN?
  1139 0000129D 743C                <1> 	jz	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1140                              <1> 	;
  1141                              <1> 	;-----	ISSUE INTERRUPT TO INDICATE PRINT SCREEN FUNCTION
  1142                              <1> K44B:
  1143 0000129F B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
  1144 000012A1 E81B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1145 000012A6 B020                <1> 	mov	al, EOI			; END OF CURRENT INTERRUPT
  1146 000012A8 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 000012AA 8025[F05D0000]FC    <1>         and     byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; ZERO OUT THESE FLAGS
  1152 000012B1 E90CFEFFFF          <1>         jmp     K27                     ; GO BACK WITHOUT EOI OCCURRING
  1153                              <1> 	;
  1154                              <1> 	;-----	HANDLE IN-CORE KEYS
  1155                              <1> K45:					; NOT-PRINT-SCREEN
  1156 000012B6 3C3A                <1> 	cmp	al, 58			; TEST FOR IN-CORE AREA
  1157 000012B8 7734                <1> 	ja	short K46		; JUMP IF NOT
  1158 000012BA 3C35                <1> 	cmp	al, 53			; IS THIS THE '/' KEY?
  1159 000012BC 7505                <1> 	jne	short K45A		; NO, JUMP
  1160 000012BE F6C702              <1> 	test	bh, LC_E0		; WAS THE LAST CODE THE MARKER?
  1161 000012C1 7518                <1> 	jnz	short K45C		; YES, TRANSLATE TO CHARACTER
  1162                              <1> K45A:
  1163 000012C3 B91A000000          <1> 	mov	ecx, 26			; LENGHT OF SEARCH
  1164 000012C8 BF[BA5C0000]        <1> 	mov	edi, K30+10		; POINT TO TABLE OF A-Z CHARS
  1165 000012CD F2AE                <1> 	repne	scasb			; IS THIS A LETTER KEY?
  1166                              <1> 		; 20/02/2015
  1167 000012CF 7505                <1> 	jne	short K45B              ; NO, SYMBOL KEY
  1168                              <1> 	;
  1169 000012D1 F6C340              <1> 	test	bl, CAPS_STATE		; ARE WE IN CAPS_LOCK?
  1170 000012D4 750C                <1> 	jnz	short K45D		; TEST FOR SURE
  1171                              <1> K45B:
  1172 000012D6 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1173 000012D9 750C                <1> 	jnz	short K45E		; YES, UPPERCASE
  1174                              <1> 					; NO, LOWERCASE
  1175                              <1> K45C:
  1176 000012DB BB[3C5D0000]        <1> 	mov	ebx, K10		; TRANSLATE TO LOWERCASE LETTERS
  1177 000012E0 EB51                <1> 	jmp	short K56	
  1178                              <1> K45D:					; ALMOST-CAPS-STATE
  1179 000012E2 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; CL ON. IS SHIFT ON, TOO?
  1180 000012E5 75F4                <1> 	jnz	short K45C		; SHIFTED TEMP OUT OF CAPS STATE
  1181                              <1> K45E:
  1182 000012E7 BB[945D0000]        <1> 	mov	ebx, K11		; TRANSLATE TO UPPER CASE LETTERS
  1183 000012EC EB45                <1> K45F:	jmp	short K56
  1184                              <1> 	;
  1185                              <1> 	;-----	TEST FOR KEYS F1 - F10
  1186                              <1> K46:					; NOT IN-CORE AREA
  1187 000012EE 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 000012F0 7635                <1> 	jna	short K53		
  1191                              <1> 	;
  1192                              <1> 	;-----	HANDLE THE NUMERIC PAD KEYS
  1193                              <1> K47:					; NOT F1 - F10
  1194 000012F2 3C53                <1> 	cmp	al, 83			; TEST NUMPAD KEYS
  1195 000012F4 772D                <1> 	ja	short K52		; JUMP IF NOT
  1196                              <1> 	;
  1197                              <1> 	;-----	KEYPAD KEYS, MUST TEST NUM LOCK FOR DETERMINATION
  1198                              <1> K48:
  1199 000012F6 3C4A                <1> 	cmp	al , 74			; SPECIAL CASE FOR MINUS
  1200 000012F8 74ED                <1> 	je	short K45E		; GO TRANSLATE
  1201 000012FA 3C4E                <1> 	cmp	al , 78			; SPECIAL CASE FOR PLUS
  1202 000012FC 74E9                <1> 	je	short K45E		; GO TRANSLATE
  1203 000012FE F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OFTHE NEW KEYS?
  1204 00001301 750A                <1> 	jnz	short K49		; YES, TRANSLATE TO BASE STATE
  1205                              <1> 	;		
  1206 00001303 F6C320              <1> 	test 	bl, NUM_STATE		; ARE WE IN NUM LOCK
  1207 00001306 7514                <1> 	jnz	short K50		; TEST FOR SURE
  1208 00001308 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1209                              <1> 	;jnz	short K51		; IF SHIFTED, REALLY NUM STATE
  1210 0000130B 75DA                <1> 	jnz	short K45E
  1211                              <1> 	;
  1212                              <1> 	;-----	BASE CASE FOR KEYPAD
  1213                              <1> K49:					
  1214 0000130D 3C4C                <1> 	cmp	al, 76			; SPECIAL CASE FOR BASE STATE 5
  1215 0000130F 7504                <1> 	jne	short K49A		; CONTINUE IF NOT KEYPAD 5
  1216 00001311 B0F0                <1> 	mov	al, 0F0h		; SPECIAL ASCII CODE	
  1217 00001313 EB40                <1> 	jmp	short K57		; BUFFER FILL
  1218                              <1> K49A:
  1219 00001315 BB[3C5D0000]        <1> 	mov	ebx, K10		; BASE CASE TABLE	
  1220 0000131A 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 0000131C F6C303              <1>         test    bl, LEFT_SHIFT+RIGHT_SHIFT
  1225 0000131F 75EC                <1> 	jnz 	short K49		; SHIFTED TEMP OUT OF NUM STATE
  1226 00001321 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 00001323 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 00001325 74AF                <1> 	je	short K45B		
  1234                              <1> 	;
  1235                              <1> 	;-----	MUST BE F11 OR F12 
  1236                              <1> K53:					; F1 - F10 COME HERE, TOO
  1237 00001327 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST SHIFT STATE
  1238 0000132A 74E1                <1> 	jz	short K49		; JUMP, LOWER CASE PSEUDO SC'S
  1239                              <1> 		; 20/02/2015 
  1240 0000132C BB[945D0000]        <1> 	mov	ebx, K11		; UPPER CASE PSEUDO SCAN CODES
  1241 00001331 EB10                <1> 	jmp	short K64		; TRANSLATE SCAN
  1242                              <1> 	;
  1243                              <1> 	;-----	TRANSLATE THE CHARACTER
  1244                              <1> K56:					; TRANSLATE-CHAR
  1245 00001333 FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1246 00001335 D7                  <1> 	xlat    			; CONVERT THE SCAN CODE TO ASCII
  1247 00001336 F605[F05D0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1248 0000133D 7416                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1249 0000133F B4E0                <1> 	mov	ah, MC_E0		; YES, PUT SPECIAL MARKER IN AH
  1250 00001341 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 00001343 FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1255 00001345 D7                  <1>        	xlat    	                ; CTL TABLE SCAN
  1256 00001346 88C4                <1> 	mov	ah, al			; PUT VALUE INTO AH
  1257 00001348 B000                <1> 	mov	al, 0			; ZERO ASCII CODE
  1258 0000134A F605[F05D0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1259 00001351 7402                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1260 00001353 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 00001355 3CFF                <1> 	cmp	al, -1			; IS THIS AN IGNORE CHAR
  1265                              <1>         ;je	short K59		; YES, DO NOTHING WITH IT
  1266 00001357 0F8459FDFFFF        <1> 	je      K26			; YES, DO NOTHING WITH IT
  1267 0000135D 80FCFF              <1> 	cmp	ah, -1			; LOOK FOR -1 PSEUDO SCAN
  1268                              <1>         ;jne	short K61		; NEAR_INTERRUPT_RETURN
  1269 00001360 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 00001366 80FC68              <1> 	cmp	ah, 68h	; ALT + F1 key
  1275 00001369 721F                <1> 	jb	short K61
  1276 0000136B 80FC6F              <1> 	cmp	ah, 6Fh ; ALT + F8 key	
  1277 0000136E 771A                <1> 	ja	short K61
  1278                              <1> 	;
  1279 00001370 8A1D[0E420100]      <1> 	mov	bl, [ACTIVE_PAGE]
  1280 00001376 80C368              <1> 	add	bl, 68h
  1281 00001379 38E3                <1> 	cmp	bl, ah
  1282 0000137B 740D                <1> 	je	short K61
  1283 0000137D 6650                <1> 	push	ax
  1284 0000137F 88E0                <1> 	mov	al, ah
  1285 00001381 2C68                <1> 	sub	al, 68h
  1286 00001383 E8F4050000          <1> 	call	set_active_page
  1287 00001388 6658                <1> 	pop	ax
  1288                              <1> K61:					; NOT-CAPS-STATE
  1289 0000138A 8B1D[FE5D0000]      <1> 	mov	ebx, [BUFFER_TAIL] 	; GET THE END POINTER TO THE BUFFER
  1290 00001390 89DE                <1> 	mov	esi, ebx		; SAVE THE VALUE
  1291 00001392 E857FAFFFF          <1> 	call	_K4			; ADVANCE THE TAIL
  1292 00001397 3B1D[FA5D0000]      <1> 	cmp	ebx, [BUFFER_HEAD] 	; HAS THE BUFFER WRAPPED AROUND
  1293 0000139D 740E                <1> 	je	short K62		; BUFFER_FULL_BEEP
  1294 0000139F 668906              <1> 	mov	[esi], ax		; STORE THE VALUE
  1295 000013A2 891D[FE5D0000]      <1> 	mov	[BUFFER_TAIL], ebx 	; MOVE THE POINTER UP
  1296 000013A8 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 000013AD B020                <1> 	mov	al, EOI			; ENABLE INTERRUPT CONTROLLER CHIP
  1311 000013AF E620                <1> 	out	INTA00, al
  1312 000013B1 66B9A602            <1> 	mov	cx, 678			; DIVISOR FOR 1760 HZ
  1313 000013B5 B304                <1> 	mov	bl, 4			; SHORT BEEP COUNT (1/16 + 1/64 DELAY)
  1314 000013B7 E8E5090000          <1> 	call	beep			; GO TO COMMON BEEP HANDLER
  1315 000013BC 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 000013C1 6650                <1> 	push	ax			; SAVE DATA TO SEND
  1325                              <1> 
  1326                              <1> 	;-----	WAIT FOR COMMAND TO ACCEPTED
  1327 000013C3 FA                  <1> 	cli				; DISABLE INTERRUPTS TILL DATA SENT
  1328                              <1> 	; xor	ecx, ecx		; CLEAR TIMEOUT COUNTER
  1329 000013C4 B900000100          <1> 	mov	ecx, 10000h			
  1330                              <1> S10:
  1331 000013C9 E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD CONTROLLER STATUS
  1332 000013CB A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ITS INPUT BUFFER BUSY
  1333 000013CD E0FA                <1> 	loopnz	S10			; WAIT FOR COMMAND TO BE ACCEPTED
  1334                              <1> 
  1335 000013CF 6658                <1> 	pop	ax			; GET DATA TO SEND
  1336 000013D1 E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROLLER
  1337 000013D3 FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
  1338 000013D4 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 000013D5 6650                <1> 	push	ax			; SAVE REGISTERS
  1349 000013D7 6653                <1> 	push	bx
  1350 000013D9 51                  <1> 	push	ecx
  1351 000013DA 88C7                <1> 	mov	bh, al			; SAVE TRANSMITTED BYTE FOR RETRIES
  1352 000013DC B303                <1> 	mov	bl, 3			; LOAD RETRY COUNT
  1353                              <1> SD0:
  1354 000013DE FA                  <1> 	cli				; DISABLE INTERRUPTS
  1355 000013DF 8025[EF5D0000]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 000013E6 B900000100          <1> 	mov	ecx, 10000h		; MAXIMUM WAIT COUNT
  1359                              <1> SD5:
  1360 000013EB E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD PROCESSOR STATUS PORT
  1361 000013ED A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ANY PENDING COMMAND
  1362 000013EF E0FA                <1> 	loopnz	SD5			; WAIT FOR COMMAND TO BE ACCEPTED
  1363                              <1> 	;
  1364 000013F1 88F8                <1> 	mov	al, bh			; REESTABLISH BYTE TO TRANSMIT
  1365 000013F3 E660                <1> 	out	PORT_A, al		; SEND BYTE
  1366 000013F5 FB                  <1> 	sti				; ENABLE INTERRUPTS
  1367                              <1> 	;mov	cx, 01A00h		; LOAD COUNT FOR 10 ms+
  1368 000013F6 B9FFFF0000          <1> 	mov	ecx, 0FFFFh
  1369                              <1> SD1:
  1370 000013FB F605[EF5D0000]30    <1> 	test	byte [KB_FLAG_2], KB_FE+KB_FA ; SEE IF EITHER BIT SET
  1371 00001402 750F                <1> 	jnz	short SD3		; IF SET, SOMETHING RECEIVED GO PROCESS
  1372 00001404 E2F5                <1> 	loop	SD1			; OTHERWISE WAIT
  1373                              <1> SD2:
  1374 00001406 FECB                <1> 	dec	bl			; DECREMENT RETRY COUNT
  1375 00001408 75D4                <1> 	jnz	short SD0		; RETRY TRANSMISSION
  1376 0000140A 800D[EF5D0000]80    <1> 	or	byte [KB_FLAG_2], KB_ERR ; TURN ON TRANSMIT ERROR FLAG
  1377 00001411 EB09                <1> 	jmp	short SD4		; RETRIES EXHAUSTED FORGET TRANSMISSION
  1378                              <1> SD3:
  1379 00001413 F605[EF5D0000]10    <1> 	test	byte [KB_FLAG_2], KB_FA ; SEE IF THIS IS AN ACKNOWLEDGE
  1380 0000141A 74EA                <1> 	jz	short SD2		; IF NOT, GO RESEND
  1381                              <1> SD4:	
  1382 0000141C 59                  <1> 	pop	ecx			; RESTORE REGISTERS
  1383 0000141D 665B                <1> 	pop	bx
  1384 0000141F 6658                <1> 	pop	ax
  1385 00001421 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 00001422 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1395 00001423 F605[EF5D0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1396 0000142A 755F                <1> 	jnz 	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1397                              <1> 	;
  1398 0000142C 800D[EF5D0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1399 00001433 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
  1400 00001435 E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
  1401 00001437 EB11                <1> 	jmp	short SL0		; GO SEND MODE INDICATOR COMMAND
  1402                              <1> SND_LED1:
  1403 00001439 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1404 0000143A F605[EF5D0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1405 00001441 7548                <1> 	jnz	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1406                              <1> 	;
  1407 00001443 800D[EF5D0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1408                              <1> SL0:
  1409 0000144A B0ED                <1> 	mov	al, LED_CMD		; LED CMD BYTE
  1410 0000144C E884FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1411 00001451 FA                  <1> 	cli
  1412 00001452 E836000000          <1> 	call	MAKE_LED		; GO FORM INDICATOR DATA BYTE
  1413 00001457 8025[EF5D0000]F8    <1> 	and	byte [KB_FLAG_2], 0F8h	; ~KB_LEDS ; CLEAR MODE INDICATOR BITS
  1414 0000145E 0805[EF5D0000]      <1> 	or	[KB_FLAG_2], al 	; SAVE PRESENT INDICATORS FOR NEXT TIME
  1415 00001464 F605[EF5D0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1416 0000146B 750F                <1> 	jnz	short SL2		; IF SO, BYPASS SECOND BYTE TRANSMISSION
  1417                              <1> 	;
  1418 0000146D E863FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1419 00001472 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1420 00001473 F605[EF5D0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1421 0000147A 7408                <1> 	jz	short SL3		; IF NOT, DON'T SEND AN ENABLE COMMAND
  1422                              <1> SL2:
  1423 0000147C B0F4                <1> 	mov	al, KB_ENABLE		; GET KEYBOARD CSA ENABLE COMMAND
  1424 0000147E E852FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1425 00001483 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1426                              <1> SL3:
  1427 00001484 8025[EF5D0000]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 0000148B FB                  <1> 	sti				; ENABLE INTERRUPTS
  1430 0000148C 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 0000148D A0[ED5D0000]        <1> 	mov	al, [KB_FLAG]		; GET CAPS & NUM LOCK INDICATORS
  1441 00001492 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 00001494 C0C004              <1> 	rol	al, 4 ; 20/02/2015
  1445 00001497 2407                <1> 	and	al, 07h			; MAKE SURE ONLY MODE BITS ON
  1446                              <1> 	;pop	cx
  1447 00001499 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 ///
  1939                                  
  1940                                  %include 'video.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - video.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 15/01/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     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> ; 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 0000149A 9C                  <1> 	pushfd
    35 0000149B 0E                  <1> 	push 	cs
    36 0000149C E851000000          <1> 	call 	VIDEO_IO_1
    37 000014A1 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 000014A2 [4F150000]          <1> M1:	dd	SET_MODE	; TABLE OF ROUTINES WITHIN VIDEO I/O
   191 000014A6 [B7180000]          <1> 	dd	SET_CTYPE
   192 000014AA [EB180000]          <1> 	dd	SET_CPOS
   193 000014AE [13190000]          <1> 	dd	READ_CURSOR
   194                              <1> 	;dd	VIDEO_RETURN	; READ_LPEN
   195 000014B2 [38150000]          <1> 	dd	set_mode_ncm	; Set mode without clearing video memory
   196 000014B6 [59190000]          <1> 	dd	ACT_DISP_PAGE
   197 000014BA [F0190000]          <1> 	dd	SCROLL_UP
   198 000014BE [141B0000]          <1> 	dd	SCROLL_DOWN
   199 000014C2 [951B0000]          <1> 	dd	READ_AC_CURRENT
   200 000014C6 [ED1B0000]          <1> 	dd	WRITE_AC_CURRENT
   201 000014CA [131C0000]          <1> 	dd	WRITE_C_CURRENT
   202 000014CE [39250000]          <1> 	dd	SET_COLOR
   203 000014D2 [A4250000]          <1> 	dd	WRITE_DOT
   204 000014D6 [6F250000]          <1> 	dd	READ_DOT
   205 000014DA [951C0000]          <1> 	dd	WRITE_TTY
   206 000014DE [20150000]          <1> 	dd	VIDEO_STATE
   207 000014E2 [EF2E0000]          <1> 	dd	vga_pal_funcs ; 10/08/2016 (TRDOS 386)
   208 000014E6 [A52A0000]          <1> 	dd	font_setup    ; 10/07/2016 (TRDOS 386)
   209 000014EA [54150000]          <1> 	dd	VIDEO_RETURN	; RESERVED
   210 000014EE [021E0000]          <1> 	dd	WRITE_STRING  ; 23/06/2016 (TRDOS 386)
   211                              <1> M1L	EQU	$ - M1
   212                              <1> 
   213                              <1> ; 14/01/2017
   214                              <1> ; 02/01/2017
   215                              <1> ; 04/07/2016
   216                              <1> ; 12/05/2016
   217                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   218                              <1> int31h:  ; Video BIOS
   219                              <1> 
   220                              <1> ; BH = Video page number
   221                              <1> ; BL = Color/Attribute
   222                              <1> ; AH = Function number
   223                              <1> ; AL = Character
   224                              <1> 
   225                              <1> VIDEO_IO_1:
   226                              <1> 	;sti				; INTERRUPTS BACK ON
   227 000014F2 FC                  <1> 	cld				; SET DIRECTION FORWARD
   228 000014F3 80FC14              <1> 	cmp	ah, M1L/4		; TEST FOR WITHIN TABLE RANGE
   229 000014F6 7327                <1> 	jnb	short M4		; BRANCH TO EXIT IF NOT A VALID COMMAND
   230                              <1> 
   231 000014F8 06                  <1> 	push	es
   232 000014F9 1E                  <1> 	push	ds			; SAVE WORK AND PARAMETER REGISTERS
   233 000014FA 52                  <1> 	push	edx
   234 000014FB 51                  <1> 	push	ecx
   235 000014FC 53                  <1> 	push	ebx
   236 000014FD 56                  <1> 	push	esi
   237 000014FE 57                  <1> 	push	edi
   238 000014FF 55                  <1> 	push	ebp
   239                              <1> 
   240 00001500 66BE1000            <1> 	mov	si, KDATA 		; POINT DS: TO DATA SEGMENT
   241 00001504 8EDE                <1> 	mov	ds, si
   242 00001506 8EC6                <1> 	mov	es, si
   243 00001508 BF00800B00          <1> 	mov	edi, 0B8000h		; GET offset FOR COLOR CARD
   244 0000150D A3[6C4F0100]        <1> 	mov	[video_eax], eax ; 12/05/2016 
   245                              <1> 	; 23/03/2016
   246 00001512 C0E402              <1> 	shl	ah, 2  ; dword		; TIMES 2 FOR WORD TABLE LOOKUP
   247 00001515 0FB6F4              <1> 	movzx	esi, ah			; MOVE OFFSET INTO LOOK UP REGISTER (SI)
   248                              <1> 	;mov	ah, [CRT_MODE]		; MOVE CURRENT MODE INTO (AH) REGISTER
   249                              <1> 
   250                              <1> 	;;15/01/2017
   251                              <1> 	; 14/01/2017
   252                              <1> 	; 02/01/2017
   253                              <1> 	;;mov	byte [intflg], 31h  ; video interrupt
   254 00001518 FB                  <1> 	sti
   255                              <1> 	;
   256                              <1> 
   257 00001519 FFA6[A2140000]      <1> 	JMP	dword [esi+M1]		; GO TO SELECTED FUNCTION
   258                              <1> 
   259                              <1> M4:					; COMMAND NOT VALID
   260 0000151F CF                  <1> 	iretd				; DO NOTHING IF NOT IN VALID RANGE
   261                              <1> 
   262                              <1> VIDEO_STATE:
   263                              <1> 	; 26/06/2016
   264                              <1> 	; 12/05/2016
   265                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   266                              <1> 
   267                              <1> ;---------------------------------------------------
   268                              <1> ; VIDEO STATE
   269                              <1> ;  RETURNS THE CURRENT VIDEO STATE IN AX
   270                              <1> ;  AH = NUMBER OF COLUMNS ON THE SCREEN
   271                              <1> ;  AL = CURRENT VIDEO MODE
   272                              <1> ;  BH = CURRENT ACTIVE PAGE
   273                              <1> ;---------------------------------------------------
   274                              <1> 
   275 00001520 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS]	; GET NUMBER OF COLUMNS
   276 00001526 A0[225E0000]        <1> 	mov	al, [CRT_MODE]	; CURRENT MODE
   277                              <1> 	;movzx	esi, al
   278                              <1> 	;mov	ah, [esi+M6] 
   279                              <1> 	; BH = active page
   280 0000152B 8A3D[0E420100]      <1> 	mov	bh, [ACTIVE_PAGE] ; GET CURRENT ACTIVE PAGE
   281 00001531 FA                  <1> 	cli	; 02/01/2017
   282 00001532 5D                  <1> 	pop	ebp		; RECOVER REGISTERS
   283 00001533 5F                  <1> 	pop	edi
   284 00001534 5E                  <1> 	pop	esi
   285 00001535 59                  <1> 	pop	ecx		; DISCARD SAVED BX
   286 00001536 EB26                <1> 	jmp	short M15	; RETURN TO CALLER
   287                              <1> 
   288                              <1> set_mode_ncm:
   289                              <1> 	; 04/07/2016 - TRDOS 386 (TRDOS v2.0)
   290                              <1> 	; set mode without clearing the video memory
   291                              <1> 	; (ony for graphics modes)
   292 00001538 3C07                <1> 	cmp	al, 7 ; IBM PC CGA modes
   293 0000153A 7613                <1> 	jna	short SET_MODE ; normal function (clear)
   294                              <1> 	; do not clear memory
   295 0000153C A2[7B4F0100]        <1> 	mov	[noclearmem], al ; > 0
   296 00001541 E81F000000          <1> 	call	_set_mode
   297 00001546 C605[7B4F0100]00    <1> 	mov	byte [noclearmem], 0
   298 0000154D EB05                <1>         jmp     short VIDEO_RETURN
   299                              <1> 
   300                              <1> 	; 10/08/2016
   301                              <1> 	; 08/08/2016
   302                              <1> 	; 30/07/2016
   303                              <1> 	; 29/07/2016
   304                              <1> 	; 27/07/2016
   305                              <1> 	; 26/07/2016
   306                              <1> 	; 25/07/2016
   307                              <1> 	; 23/07/2016
   308                              <1> 	; 18/07/2016
   309                              <1> 	; 02/07/2016
   310                              <1> 	; 26/06/2016
   311                              <1> 	; 24/06/2016
   312                              <1> 	; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
   313                              <1> SET_MODE:
   314                              <1> 	; For 32 bit TRDOS and Retro UNIX 386:
   315                              <1> 	;	valid video mode: 03h only!
   316                              <1> 	;	(VGA modes will be selected with another routine)
   317                              <1> 	;
   318                              <1> 	; set_txt_mode ; 80*25 (16 fore colors, 8 back colors)
   319                              <1> 
   320                              <1> ;------------------------------------------------------
   321                              <1> ; SET MODE					      :
   322                              <1> ;	THIS ROUTINE INITIALIZES THE ATTACHMENT TO    :
   323                              <1> ;	THE SELECTED MODE, THE SCREEN IS BLANKED.     :
   324                              <1> ; INPUT						      :
   325                              <1> ;	(AL) - MODE SELECTED (RANGE 0-7)	      :
   326                              <1> ; OUTPUT					      :
   327                              <1> ;	NONE					      :
   328                              <1> ;------------------------------------------------------
   329                              <1> 
   330 0000154F E811000000          <1> 	call	_set_mode ; 24/06/2016 (set_txt_mode)
   331                              <1> 
   332                              <1> ; 12/05/2016
   333                              <1> ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   334                              <1> 
   335                              <1> ;-----	NORMAL RETURN FROM ALL VIDEO RETURNS
   336                              <1> 
   337                              <1> VIDEO_RETURN:
   338 00001554 A1[6C4F0100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
   339                              <1> _video_return:
   340 00001559 FA                  <1> 	cli ; 02/01/2017
   341 0000155A 5D                  <1> 	pop	ebp
   342 0000155B 5F                  <1> 	pop	edi
   343 0000155C 5E                  <1> 	pop	esi
   344 0000155D 5B                  <1> 	pop	ebx
   345                              <1> M15:	; VIDEO_RETURN_C
   346                              <1> 	;;15/01/2017
   347                              <1> 	; 02/01/2017
   348                              <1> 	;;mov	byte [intflg], 0
   349                              <1> 	;
   350 0000155E 59                  <1> 	pop	ecx
   351 0000155F 5A                  <1> 	pop	edx
   352 00001560 1F                  <1> 	pop	ds
   353 00001561 07                  <1> 	pop	es	; RECOVER SEGMENTS
   354 00001562 CF                  <1> 	iretd		; ALL DONE
   355                              <1> 
   356                              <1> set_txt_mode:
   357                              <1> 	; 29/07/2016
   358                              <1> 	; 27/06/2016
   359 00001563 B003                <1> 	mov	al, 3
   360                              <1> 
   361                              <1> ; 10/08/2016
   362                              <1> ; 08/08/2016
   363                              <1> ; 30/07/2016
   364                              <1> ; 29/07/2016
   365                              <1> ; 27/07/2016
   366                              <1> ; 26/07/2016
   367                              <1> ; 25/07/2016
   368                              <1> ; 23/07/2016
   369                              <1> ; 18/07/2016
   370                              <1> ; 07/07/2016
   371                              <1> ; 04/07/2016
   372                              <1> ; 03/07/2016
   373                              <1> ; 02/07/2016
   374                              <1> ; 26/06/2016
   375                              <1> ; 24/06/2016 (set_txt_mode -> _set_mode)
   376                              <1> ; 17/06/2016
   377                              <1> ; 29/05/2016
   378                              <1> ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   379                              <1> _set_mode:
   380                              <1> 	; 24/06/2016
   381 00001565 3805[225E0000]      <1> 	cmp	[CRT_MODE], al  ; current mode = requested mode ?
   382 0000156B 750D                <1> 	jne	short _sm_0
   383 0000156D 3C03                <1> 	cmp	al, 3		; text, 80*25 color, default mode
   384                              <1> 				; for TRDOS 386 MainProg
   385 0000156F 755F                <1>         jne     short _sm_2	;  multiscreen is only for mode 3
   386                              <1> 
   387                              <1> 	; If '_set_mode' procedure is called for video mode 3
   388                              <1> 	;     while video mode is 3, video page will be cleared
   389                              <1> 	;     and cursor position of video page will be reset.	  
   390                              <1> 	
   391                              <1> 	; 29/07/2016
   392 00001571 800D[794F0100]80    <1> 	or	byte [p_crt_mode], 80h ; clear page indicator
   393 00001578 EB5B                <1>         jmp     short _sm_3
   394                              <1> _sm_0:  
   395 0000157A 803D[225E0000]03    <1> 	cmp	byte [CRT_MODE], 3
   396 00001581 7534                <1>         jne     short _sm_1
   397                              <1> 
   398                              <1> 	; If '_set_mode' procedure is called for a video mode
   399                              <1> 	;     except video mode 3, while current video mode
   400                              <1> 	;     is 3; all video pages of mode 3 will be copied 
   401                              <1> 	;     to 98000h address as backup, before mode change.	
   402                              <1> 
   403                              <1> _sm_save_pm:
   404                              <1> 	; 03/07/2016
   405                              <1> 	; save video pages
   406 00001583 BE00800B00          <1> 	mov	esi, 0B8000h
   407 00001588 BF00800900          <1> 	mov	edi, 98000h ; 30/07/2016
   408 0000158D B900200000          <1> 	mov	ecx, (0B8000h-0B0000h)/4
   409 00001592 F3A5                <1> 	rep	movsd
   410                              <1> 
   411 00001594 C605[794F0100]03    <1> 	mov	byte [p_crt_mode], 3 ; previous mode, backup sign
   412                              <1> 	;mov	cl, [ACTIVE_PAGE]
   413                              <1> 	;mov	[p_crt_page], cl
   414                              <1> 
   415                              <1> 	; save cursor positions
   416 0000159B BE[FE410100]        <1> 	mov	esi, CURSOR_POSN
   417 000015A0 BF[7E4F0100]        <1> 	mov	edi, cursor_pposn    ; cursor positions backup
   418 000015A5 B104                <1> 	mov	cl, 4
   419 000015A7 F3A5                <1> 	rep	movsd
   420                              <1> 
   421                              <1> 	; 29/07/2016
   422                              <1> 	;mov	[ACTIVE_PAGE], cl ; 0
   423 000015A9 860D[0E420100]      <1> 	xchg	cl, [ACTIVE_PAGE]
   424 000015AF 880D[7A4F0100]      <1> 	mov	[p_crt_page], cl     ; previous page (for mode 3)	
   425                              <1> 	; [ACTIVE_PAGE] = 0 
   426 000015B5 EB19                <1> 	jmp	short _sm_2
   427                              <1> 
   428                              <1> _sm_1:
   429 000015B7 3C03                <1> 	cmp	al, 3		; text, 80*25 color, default mode
   430                              <1> 				; for TRDOS 386 MainProg
   431 000015B9 7515                <1> 	jne	short _sm_2  ;  multiscreen is only for mode 3
   432                              <1> 
   433                              <1> 	; If '_set_mode' procedure is called for video mode 3
   434                              <1> 	;     while video mode is not 3 and if there is video
   435                              <1> 	;     page backup for video mode 3, all (of 8) mode 3
   436                              <1> 	;     video pages will be restored from 98000h.
   437                              <1> 
   438 000015BB 803D[794F0100]03    <1> 	cmp	byte [p_crt_mode], 3 ; previous mode, backup sign
   439 000015C2 750C                <1> 	jne	short _sm_2 ; there is no (multiscreen) video pages
   440                              <1> 			 ; to be restored
   441 000015C4 8A0D[7A4F0100]      <1> 	mov	cl, [p_crt_page]
   442 000015CA 880D[0E420100]      <1> 	mov	[ACTIVE_PAGE], cl
   443                              <1> 
   444                              <1> _sm_2:
   445 000015D0 A2[225E0000]        <1> 	mov	[CRT_MODE], al  ; save mode in global variable
   446                              <1> _sm_3:
   447                              <1> 	; 30/07/2016
   448                              <1> 	; 26/07/2016
   449                              <1> 	; 25/07/2016
   450                              <1> 	; set_mode_vga:
   451                              <1> 	; 18/07/2016
   452                              <1> 	; 14/07/2016
   453                              <1> 	; 09/07/2016
   454                              <1> 	; 04/07/2016
   455                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
   456                              <1> 	; /// video mode 13h ///
   457                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
   458                              <1> 	; vgabios-0.7a (2011)
   459                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
   460                              <1> 	; 'vgabios.c', 'vgatables.h'
   461                              <1> 	;
   462                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
   463                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
   464                              <1> 	;
   465 000015D5 88C4                <1> 	mov	ah, al
   466 000015D7 B910000000          <1> 	mov	ecx, vga_mode_count 	
   467 000015DC BE[3E5E0000]        <1> 	mov	esi, vga_modes
   468 000015E1 31DB                <1> 	xor	ebx, ebx
   469                              <1> _sm_4:
   470 000015E3 AC                  <1> 	lodsb
   471 000015E4 38C4                <1> 	cmp	ah, al
   472 000015E6 740C                <1> 	je	short _sm_5
   473 000015E8 FEC3                <1> 	inc	bl
   474 000015EA E2F7                <1> 	loop	_sm_4
   475                              <1> 
   476                              <1> 	; UNIMPLEMENTED VIDEO MODE !
   477 000015EC 31C0                <1> 	xor	eax, eax
   478 000015EE A3[6C4F0100]        <1>         mov     [video_eax], eax ; 0 
   479 000015F3 C3                  <1> 	retn
   480                              <1> 
   481                              <1> ;-----	eBX POINTS TO CORRECT ROW OF INITIALIZATION TABLE	
   482                              <1> 
   483                              <1> _sm_5: 	; 25/07/2016
   484 000015F4 89DE                <1> 	mov	esi, ebx
   485 000015F6 81C6[8E5E0000]      <1> 	add	esi, vga_memmodel
   486 000015FC 8A06                <1> 	mov	al, [esi]
   487 000015FE A2[924F0100]        <1> 	mov	[VGA_MTYPE], al
   488                              <1> 
   489 00001603 89DF                <1> 	mov	edi, ebx
   490 00001605 81C7[9E5E0000]      <1> 	add	edi, vga_dac_s 	
   491 0000160B C0E302              <1> 	shl	bl, 2 ; byte -> dword
   492 0000160E 81C3[4E5E0000]      <1> 	add	ebx, vga_mode_tbl_ptr
   493                              <1> 
   494                              <1> 	;mov	dword [VGA_BASE], 0B8000h
   495                              <1> 	;cmp	ah, 0Dh ; [CRT_MODE]
   496                              <1> 	;jb	short M9 
   497                              <1> 	;mov	dword [VGA_BASE], 0A0000h
   498                              <1> ;M9:
   499 00001614 8B33                <1> 	mov	esi, [ebx]
   500 00001616 89F3                <1> 	mov	ebx, esi
   501 00001618 83C614              <1> 	add	esi, vga_p_cm_pos ; ebx + 20
   502 0000161B 668B06              <1> 	mov	ax, [esi]       ; get the cursor mode from the table
   503 0000161E 66A3[3B5E0000]      <1> 	mov	[CURSOR_MODE], ax ; save cursor mode (initial value)
   504                              <1> 	; al = 6, ah = 7
   505                              <1> 	; al = 0Dh, ah = 0Eh ; 25/07/2016
   506 00001624 E83B020000          <1> 	call	cursor_shape_fix
   507                              <1> 	; al = 14, ah = 15  (If [CHAR_HEIGHT] = 16)
   508 00001629 668906              <1> 	mov	[esi], ax
   509                              <1> 
   510 0000162C 56                  <1> 	push	esi ; *	
   511                              <1> 
   512 0000162D 8A25[295E0000]      <1> 	mov	ah, [VGA_MODESET_CTL]
   513 00001633 80E408              <1> 	and	ah, 8 ; default palette loading ?
   514 00001636 7524                <1> 	jnz	short _sm_6
   515 00001638 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK (DAC mask register)
   516 0000163C B0FF                <1> 	mov	al, 0FFh ; PEL mask
   517 0000163E EE                  <1> 	out	dx, al
   518 0000163F 8A27                <1> 	mov	ah, [edi] ; DAC model (selection number)
   519 00001641 E8ED0F0000          <1> 	call	load_dac_palette
   520                              <1> 	; ecx = 0
   521 00001646 F605[295E0000]02    <1> 	test	byte [VGA_MODESET_CTL], 2 ; gray scale summing
   522 0000164D 740D                <1> 	jz	short _sm_6
   523 0000164F 53                  <1> 	push	ebx
   524 00001650 29DB                <1> 	sub	ebx, ebx ; sub bl, bl
   525 00001652 66B90001            <1>         mov     cx, 256 
   526 00001656 E82B100000          <1> 	call	gray_scale_summing
   527 0000165B 5B                  <1> 	pop	ebx	
   528                              <1> _sm_6:
   529                              <1> 	; Reset Attribute Ctl flip-flop
   530 0000165C 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
   531 00001660 EC                  <1>  	in	al, dx
   532                              <1> 	; Set Attribute Ctl
   533 00001661 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   534 00001663 83C623              <1> 	add	esi, 35  ; actl regs
   535 00001666 30E4                <1> 	xor	ah, ah ; 0
   536 00001668 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
   537                              <1> _sm_7:
   538 0000166C 88E0                <1> 	mov	al, ah
   539 0000166E EE                  <1> 	out	dx, al ; index
   540 0000166F AC                  <1> 	lodsb
   541                              <1> 	; DX = 3C0h = VGAREG_ACTL_WRITE_DATA
   542 00001670 EE                  <1> 	out	dx, al ; value
   543 00001671 FEC4                <1> 	inc	ah
   544 00001673 80FC14              <1> 	cmp	ah, 20 ; number of actl registers
   545 00001676 72F4                <1> 	jb	short _sm_7
   546                              <1> 	;
   547 00001678 88E0                <1> 	mov	al, ah ; 20
   548 0000167A EE                  <1> 	out	dx, al ; index
   549 0000167B 28C0                <1> 	sub	al, al ; 0
   550 0000167D EE                  <1> 	out	dx, al ; value
   551                              <1> 	;
   552                              <1> 	; Set Sequencer Ctl
   553 0000167E 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   554 00001680 83C605              <1> 	add	esi, 5 ; sequ regs
   555                              <1> 	;
   556 00001683 66BAC403            <1> 	mov	dx, 3C4h  ; VGAREG_SEQU_ADDRESS
   557 00001687 EE                  <1> 	out	dx, al ; 0
   558 00001688 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
   559 0000168A B003                <1> 	mov	al, 3
   560 0000168C EE                  <1> 	out	dx, al
   561 0000168D B401                <1> 	mov	ah, 1	
   562                              <1> _sm_8:
   563 0000168F 88E0                <1> 	mov	al, ah
   564                              <1> 	;mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   565 00001691 664A                <1> 	dec	dx
   566 00001693 EE                  <1> 	out	dx, al ; index
   567 00001694 AC                  <1> 	lodsb
   568 00001695 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
   569 00001697 EE                  <1> 	out	dx, al
   570 00001698 80FC04              <1> 	cmp	ah, 4 ; number of sequ regs
   571 0000169B 7304                <1> 	jnb	short _sm_9		
   572 0000169D FEC4                <1> 	inc	ah 
   573 0000169F EBEE                <1> 	jmp	short _sm_8
   574                              <1> _sm_9:
   575                              <1> 	; Set Grafx Ctl
   576 000016A1 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   577 000016A3 83C637              <1> 	add	esi, 55 ; grdc regs
   578 000016A6 30E4                <1> 	xor	ah, ah ; 0
   579                              <1> _sm_10:
   580 000016A8 88E0                <1> 	mov	al, ah
   581 000016AA 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
   582 000016AE EE                  <1> 	out	dx, al	
   583 000016AF AC                  <1> 	lodsb
   584 000016B0 6642                <1> 	inc	dx ; 3CFh ; VGAREG_GRDC_DATA
   585 000016B2 EE                  <1> 	out	dx, al
   586 000016B3 FEC4                <1> 	inc	ah
   587 000016B5 80FC09              <1> 	cmp	ah, 9 ; number of grdc regs
   588 000016B8 72EE                <1> 	jb	short _sm_10
   589                              <1> 	;
   590                              <1> 	; Disable CRTC write protection
   591 000016BA 66BAD403            <1> 	mov	dx, 3D4h  ; VGAREG_VGA_CRTC_ADDRESS
   592                              <1> 	;mov	al, 11h
   593                              <1> 	;our	dx, al
   594                              <1> 	;inc	dx
   595                              <1> 	;sub	al, al
   596                              <1> 	;out	dx, al
   597 000016BE 66B81100            <1> 	mov	ax, 11h
   598 000016C2 66EF                <1> 	out	dx, ax
   599 000016C4 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   600 000016C6 83C60A              <1> 	add	esi, 10 ; crtc regs
   601                              <1> 	; ah = 0
   602                              <1> _sm_11:
   603 000016C9 88E0                <1> 	mov	al, ah
   604                              <1> 	; dx = 3D4h = VGAREG_VGA_CRTC_ADDRESS
   605 000016CB EE                  <1> 	out	dx, al ; index
   606 000016CC AC                  <1> 	lodsb
   607 000016CD 6642                <1> 	inc	dx  ; VGAREG_VGA_CRTC_ADDRESS + 1
   608 000016CF EE                  <1> 	out	dx, al ; value
   609 000016D0 80FC18              <1> 	cmp	ah, 24 ; number of crtc registers - 1
   610 000016D3 7306                <1> 	jnb	short _sm_12
   611 000016D5 FEC4                <1> 	inc	ah
   612 000016D7 664A                <1> 	dec	dx ; 3D4h
   613 000016D9 EBEE                <1> 	jmp	short _sm_11
   614                              <1> _sm_12:
   615                              <1> 	; Set the misc register
   616 000016DB 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
   617 000016DF 8A4309              <1> 	mov	al, [ebx+9] ; misc reg
   618 000016E2 EE                  <1> 	out	dx, al
   619                              <1> 	;
   620                              <1> 	; Enable video
   621 000016E3 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
   622 000016E7 B020                <1> 	mov	al, 20h  
   623 000016E9 EE                  <1>         out     dx, al   ; set bit 5 to 1
   624 000016EA 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
   625 000016EE EC                  <1> 	in	al, dx
   626                              <1> 	;
   627 000016EF 803D[7B4F0100]00    <1> 	cmp	byte [noclearmem], 0
   628 000016F6 7740                <1>         ja      short _sm_15
   629                              <1> 
   630                              <1> 	; 29/07/2016
   631 000016F8 31C0                <1> 	xor	eax, eax
   632 000016FA B900400000          <1> 	mov	ecx, 4000h ; 16K words (32K)
   633 000016FF 803D[924F0100]02    <1> 	cmp     byte [VGA_MTYPE], 2  ; CTEXT, MTEXT, CGA
   634 00001706 7715                <1> 	ja	short _sm_14    ; no ? (0A0000h)
   635 00001708 BF00800B00          <1> 	mov	edi, 0B8000h
   636 0000170D 7409                <1> 	je	short _sm_13	; CGA graphics mode
   637                              <1> 	; 08/08/2016
   638 0000170F A3[8E4F0100]        <1> 	mov	[VGA_INT43H], eax ; 0 ; default font 
   639 00001714 66B82007            <1> 	mov	ax, 0720h	; CGA text mode
   640                              <1> _sm_13:
   641 00001718 F366AB              <1> 	rep	stosw
   642 0000171B EB1B                <1> 	jmp	short _sm_15		
   643                              <1> 
   644                              <1> _sm_14:
   645 0000171D BF00000A00          <1> 	mov	edi, 0A0000h
   646                              <1> 	; ecx = 16384 dwords  (64K)
   647 00001722 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   648 00001726 B002                <1> 	mov	al, 2
   649 00001728 EE                  <1> 	out	dx, al
   650                              <1> 	;mov	dx, 3C5h ; VGAREG_SEQU_DATA
   651 00001729 6642                <1> 	inc	dx
   652 0000172B EC                  <1> 	in	al, dx ; mmask
   653 0000172C 6650                <1> 	push	ax
   654 0000172E B00F                <1> 	mov	al, 0Fh ; all planes
   655 00001730 EE                  <1> 	out	dx, al
   656 00001731 30C0                <1> 	xor	al, al ; 0
   657 00001733 F3AB                <1> 	rep	stosd	; ecx = 163684 (64K)
   658 00001735 6658                <1> 	pop	ax
   659 00001737 EE                  <1> 	out	dx, al  ; mmask
   660                              <1> _sm_15:
   661                              <1> 	; ebx = addr of params tbl for selected mode
   662                              <1> 	; 10/08/2016
   663 00001738 668B03              <1> 	mov	ax, [ebx] ; num of columns, 'twidth'
   664 0000173B A2[245E0000]        <1> 	mov	[CRT_COLS], al
   665                              <1> 	;; 26/07/2016
   666                              <1> 	;; CRTC_ADDRESS = 3D4h (always)
   667                              <1> 	;mov	ah, [ebx+1] ; num of rows, 'theightm1'
   668 00001740 FEC4                <1> 	inc	ah ; 09/07/2016
   669 00001742 8825[2A5E0000]      <1> 	mov	[VGA_ROWS], ah
   670                              <1> 	; 10/08/2016
   671 00001748 8A4302              <1> 	mov	al, [ebx+2]
   672 0000174B A2[265E0000]        <1> 	mov	[CHAR_HEIGHT], al 
   673                              <1> 	; 29/07/2016
   674                              <1> 	; length of regen buffer in bytes
   675 00001750 668B4B03            <1> 	mov	cx, [ebx+3] ; 'slength_l'
   676 00001754 66890D[7C4F0100]    <1> 	mov	[CRT_LEN], cx
   677                              <1> 	;
   678                              <1> 	; 27/07/2016
   679 0000175B 30E4                <1> 	xor	ah, ah
   680 0000175D A0[0E420100]        <1> 	mov	al, [ACTIVE_PAGE] ; may be > 0 for mode 3
   681                              <1> 	;mul	word [CRT_LEN] ; 4096 for mode 3
   682 00001762 66F7E1              <1> 	mul	cx ; 29/07/2016
   683 00001765 66A3[FC410100]      <1> 	mov	[CRT_START], ax
   684                              <1> 	;
   685 0000176B B060                <1> 	mov	al, 60h
   686 0000176D 803D[7B4F0100]00    <1> 	cmp	byte [noclearmem], 0
   687 00001774 7602                <1> 	jna	short _sm_16
   688 00001776 0480                <1> 	add	al, 80h
   689                              <1> _sm_16:
   690 00001778 A2[275E0000]        <1> 	mov	[VGA_VIDEO_CTL], al
   691 0000177D C605[285E0000]F9    <1> 	mov	byte [VGA_SWITCHES], 0F9h
   692 00001784 8025[295E0000]7F    <1> 	and	byte [VGA_MODESET_CTL], 7Fh
   693                              <1> 
   694 0000178B 5E                  <1> 	pop	esi ; *
   695                              <1> 
   696                              <1> 	; 26/07/2016
   697                              <1> 	; 07/07/2016
   698 0000178C 668B0D[3B5E0000]    <1> 	mov	cx, [CURSOR_MODE] ; restore cursor mode (initial value)
   699 00001793 66870E              <1> 	xchg	cx, [esi] ; cl = start line, ch = end line
   700                              <1> 			  ; reset to initial value
   701 00001796 86E9                <1> 	xchg 	ch, cl  ; ch = start line, cl = end line  
   702 00001798 66890D[3B5E0000]    <1> 	mov	[CURSOR_MODE], cx ; save (fixed) cursor mode
   703                              <1> 
   704                              <1> 	; 27/07/2016
   705 0000179F 803D[924F0100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
   706 000017A6 7317                <1> 	jnb	short _sm_17
   707                              <1> 
   708                              <1> 	; Set cursor shape
   709                              <1> 	;mov	cx, 0607h
   710                              <1> 	;call	_set_ctype
   711                              <1> 
   712                              <1> 	; 29/07/2016
   713 000017A8 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
   714 000017AA E8C4050000          <1> 	call	m16	; output cx register
   715                              <1> 	
   716                              <1> 	; 25/07/2016
   717 000017AF 803D[225E0000]03    <1>         cmp     byte [CRT_MODE], 03h
   718 000017B6 7507                <1> 	jne	short _sm_17
   719                              <1> 	; 26/07/2016
   720                              <1> 
   721 000017B8 A0[0E420100]        <1> 	mov	al, [ACTIVE_PAGE]
   722 000017BD EB0C                <1> 	jmp	short _sm_18
   723                              <1> _sm_17:
   724                              <1> 	; Set cursor pos for page 0..7
   725 000017BF 6629C0              <1> 	sub	ax, ax ; eax = 0
   726 000017C2 BF[FE410100]        <1> 	mov	edi, CURSOR_POSN
   727 000017C7 AB                  <1> 	stosd	
   728 000017C8 AB                  <1> 	stosd
   729 000017C9 AB                  <1> 	stosd
   730 000017CA AB                  <1> 	stosd
   731                              <1> 	;; Set active page 0
   732                              <1> 	;mov	[ACTIVE_PAGE], al ; 0
   733                              <1> _sm_18:
   734                              <1> 	; 29/07/2016
   735 000017CB 803D[924F0100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
   736 000017D2 0F8386000000        <1>         jnb	_sm_23
   737                              <1> 
   738                              <1> 	;cmp	byte [CHAR_HEIGHT], 16
   739                              <1> 	;je	short _sm_19
   740                              <1> 
   741                              <1>  	;; copy and activate 8x16 font
   742                              <1> 	
   743                              <1> 	; 26/07/2016
   744 000017D8 B004                <1> 	mov	al, 04h
   745                              <1> 	;sub	bl, bl
   746                              <1> 	; AX = 1104H ; Load ROM 8x16 Character Set
   747                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
   748 000017DA E83A150000          <1> 	call	load_text_8_16_pat
   749                              <1> 
   750                              <1> 	; video_func_1103h:
   751                              <1> 	; biosfn_set_text_block_specifier:
   752                              <1> 	; BL = font block selector code	
   753                              <1> 	; NOTE: TRDOS 386 only uses and sets font block 0
   754                              <1> 	; (It is as BL = 0 for TRDOS 386)
   755 000017DF 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   756                              <1> 	;mov	ah, bl
   757 000017E3 28E4                <1> 	sub	ah, ah ; 0
   758 000017E5 B003                <1> 	mov	al, 03h
   759 000017E7 66EF                <1> 	out	dx, ax
   760                              <1> _sm_19:
   761                              <1> 	; 29/07/2016
   762                              <1> 	; 26/07/2016
   763                              <1> 	; 24/06/2016
   764                              <1> 	;mov	edi, 0B8000h
   765                              <1> 	;mov	cx, 4000h ; 16K words (32K)
   766                              <1> 	;
   767 000017E9 30C0                <1> 	xor	al, al
   768 000017EB 3805[794F0100]      <1>         cmp     byte [p_crt_mode], al ; 0 
   769 000017F1 7707                <1>         ja      short _sm_20 ; 3h, 80h or 83h
   770                              <1> 
   771                              <1> 	; 30/07/2016
   772                              <1> 	; 24/06/2016
   773                              <1> 	; TRDOS 386 (TRDOS v2) 'set mode' modification
   774                              <1> 	; (for multiscreen feature):
   775                              <1> 	; If '_set_mode' procedure is called for video mode 3
   776                              <1> 	;     while video mode is 3, video page will be cleared
   777                              <1> 	;     and cursor position of video page will be reset.	  
   778                              <1> 	; If '_set_mode' procedure is called for a video mode
   779                              <1> 	;     except video mode 3, while current video mode
   780                              <1> 	;     is 3; all video pages of mode 3 will be copied 
   781                              <1> 	;     to 98000h address as backup, before mode change.	 	
   782                              <1> 	; If '_set_mode' procedure is called for video mode 3
   783                              <1> 	;     while video mode is not 3 and if there is video
   784                              <1> 	;     page backup for video mode 3, all (of 8) mode 3
   785                              <1> 	;     video pages will be restored from 98000h.
   786                              <1> 
   787 000017F3 A2[0E420100]        <1> 	mov	[ACTIVE_PAGE], al ; 0
   788                              <1> 	;mov	ax, 0720h
   789                              <1> 	;;mov	cx, 4000h ; 16K words (32K)
   790                              <1> 	;;mov	edi, 0B8000h
   791                              <1> 	;rep	stosw
   792                              <1> 	;sub	al, al
   793 000017F8 EB64                <1> 	jmp	short _sm_23
   794                              <1> _sm_20:
   795                              <1> 	; Previous video mode is 3
   796                              <1> 	; New video mode is 3 while current video mode is not 3
   797                              <1> 	; (multi screen) video pages will be restored from 0B0000h
   798                              <1> 
   799 000017FA 0FB61D[0E420100]    <1> 	movzx	ebx, byte [ACTIVE_PAGE]
   800 00001801 D0E3                <1> 	shl	bl, 1 ; * 2
   801 00001803 81C3[FE410100]      <1> 	add	ebx, CURSOR_POSN
   802                              <1> 
   803                              <1> 	; 29/07/2016
   804 00001809 F605[794F0100]7F    <1> 	test    byte [p_crt_mode], 7Fh ; 83h or 3h
   805 00001810 7427                <1> 	jz	short _sm_21	; do not restore video pages
   806                              <1> 
   807                              <1> 	;; restore video pages
   808 00001812 BE00800900          <1> 	mov	esi, 98000h ; 30/07/2016 
   809 00001817 BF00800B00          <1> 	mov	edi, 0B8000h
   810 0000181C 66B90020            <1> 	mov	cx, 2000h ; 8K dwords (32K)
   811 00001820 F3A5                <1> 	rep	movsd
   812                              <1> 
   813                              <1> 	; restore cursor positions
   814 00001822 BE[7E4F0100]        <1> 	mov	esi, cursor_pposn
   815 00001827 BF[FE410100]        <1> 	mov	edi, CURSOR_POSN
   816                              <1> 	;mov	ecx, 4	; restore all cursor positions (16 bytes)
   817 0000182C B104                <1> 	mov	cl, 4
   818 0000182E F3A5                <1> 	rep 	movsd
   819                              <1> 
   820 00001830 F605[794F0100]80    <1>         test    byte [p_crt_mode], 80h
   821 00001837 7420                <1> 	jz	short _sm_22 ; do not clear current video pages
   822                              <1> _sm_21:
   823                              <1> 	; clear video page
   824 00001839 668B0D[7C4F0100]    <1> 	mov	cx, [CRT_LEN] ; 4096 
   825 00001840 66D1E9              <1> 	shr	cx, 1 ; 2072
   826 00001843 66B82007            <1> 	mov	ax, 0720h
   827 00001847 BF00800B00          <1> 	mov	edi, 0B8000h ; [crt_base]
   828 0000184C 66033D[FC410100]    <1> 	add	di, [CRT_START]
   829 00001853 F366AB              <1> 	rep	stosw	; FILL THE REGEN BUFFER WITH BLANKS
   830                              <1> 	;
   831 00001856 66890B              <1> 	mov	[ebx], cx ; reset cursor position
   832                              <1> _sm_22:
   833 00001859 A2[794F0100]        <1> 	mov	[p_crt_mode], al ; 0
   834                              <1> _sm_23:
   835                              <1> 	; al = video page number
   836                              <1> 	; [CRT_LEN] = length of regen buffer in bytes
   837 0000185E E81E010000          <1> 	call	_set_active_page
   838                              <1> 
   839                              <1> ;-----	NORMAL RETURN FROM ALL VIDEO RETURNS
   840 00001863 C3                  <1> 	retn
   841                              <1> 
   842                              <1> cursor_shape_fix:
   843                              <1> 	; 07/07/2016
   844                              <1> 	; (Cursor start and cursor end line values -6,7-
   845                              <1> 	; will be fixed depending on character height)
   846                              <1> 	;
   847                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
   848                              <1> 	; vgabios-0.7a (2011)
   849                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
   850                              <1> 	; 'vgabios.c', ' biosfn_set_cursor_shape (CH,CL)'
   851                              <1> 	;
   852                              <1> 	; INPUT ->
   853                              <1> 	;	AL = cursor start line (=6)
   854                              <1> 	;	AH = cursor end line (=7)
   855                              <1> 	; OUTPUT ->
   856                              <1> 	;	AL = cursor start line (=14)
   857                              <1> 	;	AH = cursor end line (=15)
   858                              <1> 	;
   859                              <1> 	;; if((modeset_ctl&0x01)&&(cheight>8)&&(CL<8)&&(CH<0x20))
   860                              <1> 
   861                              <1> 	;test	byte [VGA_MODESET_CTL], 1 ; VGA active
   862                              <1> 	;jz	short csf_3
   863 00001864 803D[265E0000]08    <1> 	cmp	byte [CHAR_HEIGHT], 8
   864 0000186B 7649                <1> 	jna	short csf_3
   865 0000186D 80FC08              <1> 	cmp	ah, 8
   866 00001870 7344                <1> 	jnb	short csf_3
   867 00001872 3C20                <1> 	cmp	al, 20h
   868 00001874 7340                <1> 	jnb	short csf_3
   869                              <1> 	;
   870 00001876 6650                <1> 	push	ax
   871                              <1> 	; {
   872                              <1>    	; if(CL!=(CH+1))	
   873 00001878 FEC0                <1> 	inc	al
   874 0000187A 38C4                <1> 	cmp	ah, al   ; ah != al + 1
   875 0000187C 740F                <1>         je      short csf_1
   876                              <1> 	; CH = ((CH+1) * cheight / 8) -1;
   877 0000187E 8A25[265E0000]      <1> 	mov	ah, [CHAR_HEIGHT]
   878 00001884 F6E4                <1> 	mul	ah
   879 00001886 C0E803              <1> 	shr	al, 3 ; / 8
   880 00001889 FEC8                <1> 	dec	al ; - 1
   881 0000188B EB0E                <1> 	jmp	short csf_2 
   882                              <1> csf_1: 	
   883                              <1>  	; }
   884                              <1>    	; else		; ah = al + 1
   885                              <1>     	; {
   886 0000188D FEC4                <1> 	inc	ah	; ah = ah + 1   
   887                              <1> 	; CH = ((CL+1) * cheight / 8) - 2;
   888 0000188F A0[265E0000]        <1> 	mov	al, [CHAR_HEIGHT]
   889 00001894 F6E4                <1> 	mul	ah
   890 00001896 C0E803              <1> 	shr	al, 3 ; / 8
   891 00001899 2C02                <1> 	sub	al, 2 ; - 2
   892                              <1> 	; al = 14 (if [CHAR_HEIGHT] = 16)
   893                              <1> csf_2:
   894 0000189B 880424              <1> 	mov	[esp], al
   895 0000189E 8A642401            <1> 	mov	ah, [esp+1]
   896                              <1> 	; CL = ((CL+1) * cheight / 8) - 1;
   897 000018A2 FEC4                <1> 	inc	ah 
   898 000018A4 A0[265E0000]        <1> 	mov	al, [CHAR_HEIGHT]
   899 000018A9 F6E4                <1> 	mul	ah
   900 000018AB C0E803              <1> 	shr	al, 3 ; / 8
   901 000018AE FEC8                <1> 	dec	al ; - 1
   902 000018B0 88442401            <1> 	mov	[esp+1], al
   903                              <1> 	; ah = 15 (if [CHAR_HEIGHT] = 16)
   904                              <1> 	;
   905 000018B4 6658                <1> 	pop	ax
   906                              <1> csf_3:
   907 000018B6 C3                  <1> 	retn
   908                              <1> 
   909                              <1> SET_CTYPE:
   910                              <1> 	; 12/09/2016
   911                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   912 000018B7 803D[225E0000]07    <1> 	cmp	byte [CRT_MODE], 7
   913 000018BE 0F8790FCFFFF        <1> 	ja	VIDEO_RETURN ; 12/09/2016
   914 000018C4 E805000000          <1> 	call	_set_ctype
   915 000018C9 E986FCFFFF          <1>         jmp     VIDEO_RETURN
   916                              <1> 
   917                              <1> _set_ctype:
   918                              <1> 	; 02/09/2014 (Retro UNIX 386 v1)
   919                              <1> 	;
   920                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
   921                              <1> 
   922                              <1> 	; (CH) = BITS 4-0 = START LINE FOR CURSOR
   923                              <1> 	;  ** HARDWARE WILL ALWAYS CAUSE BLINK
   924                              <1> 	;  ** SETTING BIT 5 OR 6 WILL CAUSE ERRATIC BLINKING
   925                              <1> 	;     OR NO CURSOR AT ALL
   926                              <1> 	; (CL) = BITS 4-0 = END LINE FOR CURSOR
   927                              <1> 
   928                              <1> ;------------------------------------------------
   929                              <1> ; SET_CTYPE
   930                              <1> ;	THIS ROUTINE SETS THE CURSOR VALUE
   931                              <1> ; INPUT
   932                              <1> ;	(CX) HAS CURSOR VALUE CH-START LINE, CL-STOP LINE
   933                              <1> ; OUTPUT	
   934                              <1> ;	NONE
   935                              <1> ;------------------------------------------------
   936                              <1> 
   937                              <1> 	; 07/07/2016
   938                              <1> 	; Fixing cursor start and stop line depending on
   939                              <1> 	; current character height (=16)
   940                              <1> 	; (Note: Default/initial values are 6 and 7.
   941                              <1> 	; If set values are 6 (start) & 7 (stop) and 
   942                              <1> 	; [CHAR_HEIGHT] = 16 :
   943                              <1> 	; After fixing, start line will be 14, stop line
   944                              <1> 	; will be 15.)
   945 000018CE 6689C8              <1> 	mov	ax, cx
   946 000018D1 86C4                <1> 	xchg	al, ah
   947                              <1> 	; AL = start line, AH = stop line
   948 000018D3 E88CFFFFFF          <1> 	call	cursor_shape_fix
   949                              <1> 	; AL = start line (fixed), AH = stop line (fixed)
   950 000018D8 6689C1              <1> 	mov	cx, ax
   951 000018DB 86E9                <1> 	xchg	ch, cl
   952                              <1> 	; CH = start line (fixed), CL = stop line (fixed)
   953                              <1> 	;
   954 000018DD B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
   955 000018DF 66890D[3B5E0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
   956                              <1> 	;call	m16	; output cx register
   957                              <1> 	;retn
   958 000018E6 E988040000          <1>         jmp     m16
   959                              <1> 
   960                              <1> SET_CPOS:
   961                              <1> 	; 12/09/2016
   962                              <1> 	; 07/07/2016
   963                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   964 000018EB 80FF07              <1> 	cmp	bh, 7 ; video page > 7 ; 07/07/2016
   965 000018EE 0F8760FCFFFF        <1> 	ja	VIDEO_RETURN
   966                              <1> 	;
   967 000018F4 803D[225E0000]07    <1> 	cmp	byte [CRT_MODE], 7
   968 000018FB 770A                <1> 	ja	short vga_set_cpos ; 12/09/2016	
   969 000018FD E846040000          <1> 	call	_set_cpos
   970 00001902 E94DFCFFFF          <1>         jmp     VIDEO_RETURN
   971                              <1> 
   972                              <1> vga_set_cpos:
   973                              <1> 	; 12/09/2016
   974                              <1> 	; 09/07/2016
   975                              <1> 	; set cursor position
   976                              <1> 	; NOTE: Hardware cursor position will not be set
   977                              <1> 	;   in any VGA modes (>7)
   978                              <1> 	;   But, cursor position will be saved into
   979                              <1> 	;   [CURSOR_POSN].
   980                              <1> 	;   TRDOS 386 (TRDOS v2.0) uses only one page
   981                              <1> 	;   (page 0) for all graphics modes.
   982                              <1> 
   983 00001907 668915[FE410100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
   984                              <1> 	; 04/08/2016
   985                              <1> 	;mov	bh, [ACTIVE_PAGE] ; = 0
   986                              <1> 	;call	_set_cpos
   987 0000190E E941FCFFFF          <1> 	jmp     VIDEO_RETURN
   988                              <1> 
   989                              <1> READ_CURSOR:
   990                              <1> 	; 12/09/2016
   991                              <1> 	; 07/07/2016
   992                              <1> 	; 12/05/2016
   993                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   994                              <1> 	;
   995                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
   996                              <1> 
   997                              <1> ;------------------------------------------------------
   998                              <1> ; READ_CURSOR
   999                              <1> ;	THIS ROUTINE READS THE CURRENT CURSOR VALUE FROM THE
  1000                              <1> ;	845, FORMATS IT, AND SENDS IT BACK TO THE CALLER
  1001                              <1> ; INPUT
  1002                              <1> ;	BH - PAGE OF CURSOR
  1003                              <1> ; OUTPUT
  1004                              <1> ;	DX - ROW, COLUMN OF THE CURRENT CURSOR POSITION
  1005                              <1> ;	CX - CURRENT CURSOR MODE
  1006                              <1> ;------------------------------------------------------
  1007                              <1> 
  1008                              <1> 	; BH = Video page number (0 to 7)
  1009                              <1> 
  1010                              <1> 	; 07/07/2016
  1011 00001913 80FF07              <1> 	cmp	bh, 7 ; video page > 7 (invalid)
  1012 00001916 7606                <1> 	jna	short read_cursor_1
  1013                              <1> 	; invalid video page (input) 
  1014 00001918 31C9                <1> 	xor	ecx, ecx ; 0
  1015 0000191A 31D2                <1> 	xor	edx, edx ; 0
  1016 0000191C EB15                <1> 	jmp	short read_cursor_2
  1017                              <1> read_cursor_1:
  1018                              <1> 	; 12/09/2016
  1019 0000191E 803D[225E0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; vga mode
  1020 00001925 7727                <1> 	ja	short vga_get_cpos
  1021                              <1> 	;
  1022 00001927 E815000000          <1> 	call	get_cpos
  1023 0000192C 0FB70D[3B5E0000]    <1> 	movzx	ecx, word [CURSOR_MODE]
  1024                              <1> read_cursor_2:
  1025 00001933 5D                  <1> 	pop	ebp
  1026 00001934 5F                  <1> 	pop	edi
  1027 00001935 5E                  <1> 	pop	esi
  1028 00001936 5B                  <1> 	pop	ebx
  1029 00001937 58                  <1> 	pop	eax  ; DISCARD SAVED CX AND DX
  1030 00001938 58                  <1> 	pop	eax
  1031 00001939 A1[6C4F0100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
  1032                              <1> 	;;15/01/2017
  1033                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017
  1034 0000193E 1F                  <1> 	pop	ds
  1035 0000193F 07                  <1> 	pop	es
  1036 00001940 CF                  <1> 	iretd
  1037                              <1> 
  1038                              <1> get_cpos:
  1039                              <1> 	; 12/05/2016
  1040                              <1> 	; 16/01/2016
  1041                              <1> 	; BH = Video page number (0 to 7)
  1042                              <1> 	;
  1043 00001941 D0E7                <1> 	shl	bh, 1 ; WORD OFFSET
  1044 00001943 0FB6F7              <1> 	movzx	esi, bh 
  1045 00001946 0FB796[FE410100]    <1> 	movzx	edx, word [esi+CURSOR_POSN]
  1046 0000194D C3                  <1> 	retn
  1047                              <1> 
  1048                              <1> vga_get_cpos:
  1049                              <1> 	; 12/09/2016
  1050                              <1> 	; get cursor position (vga)
  1051 0000194E 0FB715[FE410100]    <1> 	movzx	edx, word [CURSOR_POSN] ; cursor pos for pg 0
  1052 00001955 31C9                <1> 	xor	ecx, ecx ; Cursor Mode = 0 (invalid)
  1053 00001957 EBDA                <1> 	jmp     short read_cursor_2
  1054                              <1> 
  1055                              <1> ACT_DISP_PAGE:
  1056                              <1> 	; 07/07/2016
  1057                              <1> 	; 26/06/2016
  1058                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1059                              <1> 	;
  1060                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1061                              <1> 	;
  1062                              <1> ;-----------------------------------------------------
  1063                              <1> ; ACT_DISP_PAGE
  1064                              <1> ;	THIS ROUTINE SETS THE ACTIVE DISPLAY PAGE, ALLOWING
  1065                              <1> ;	THE FULL USE OF THE MEMORY SET ASIDE FOR THE VIDEO ATTACHMENT
  1066                              <1> ; INPUT
  1067                              <1> ;	AL HAS THE NEW ACTIVE DISPLAY PAGE
  1068                              <1> ; OUTPUT
  1069                              <1> ;	THE 6845 IS RESET TO DISPLAY THAT PAGE
  1070                              <1> ;-----------------------------------------------------
  1071                              <1> 	; 07/07/2016
  1072 00001959 3C07                <1> 	cmp	al, 7	; > 7 = invalid video page number
  1073 0000195B 0F87F3FBFFFF        <1> 	ja	VIDEO_RETURN
  1074 00001961 803D[225E0000]03    <1>         cmp     byte [CRT_MODE], 3
  1075 00001968 7408                <1> 	je	short adp_1
  1076 0000196A 20C0                <1> 	and 	al, al
  1077 0000196C 0F85E2FBFFFF        <1>         jnz     VIDEO_RETURN
  1078                              <1> 	;sub	al, al ; 0 ; force to page 0
  1079                              <1> adp_1:	
  1080 00001972 E805000000          <1> 	call	set_active_page
  1081 00001977 E9D8FBFFFF          <1>         jmp     VIDEO_RETURN
  1082                              <1> 
  1083                              <1> set_active_page:   ; tty_sw
  1084                              <1> 	; 26/07/2016
  1085                              <1> 	; 26/06/2016
  1086                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1087                              <1> 	; 30/06/2015
  1088                              <1> 	; 04/03/2014  (act_disp_page --> tty_sw)
  1089                              <1> 	; 10/12/2013
  1090                              <1> 	; 04/12/2013
  1091                              <1> 	;
  1092 0000197C A2[0E420100]        <1> 	mov	[ACTIVE_PAGE], al ; save active page value ; [ptty]
  1093                              <1> _set_active_page:
  1094                              <1> 	; 27/06/2015
  1095 00001981 0FB6D8              <1> 	movzx	ebx, al
  1096                              <1> 	;
  1097 00001984 6698                <1> 	cbw	; 07/09/2014 (ah=0)
  1098 00001986 66F725[7C4F0100]    <1> 	mul	word [CRT_LEN]  ; get saved length of regen buffer
  1099                              <1> 				; display page times regen length
  1100                              <1> 	; 10/12/2013
  1101 0000198D 66A3[FC410100]      <1> 	mov	[CRT_START], ax ; save start address for later
  1102 00001993 6689C1              <1> 	mov	cx, ax ; start address to cx
  1103                              <1> _M16:
  1104                              <1> 	;sar	cx, 1
  1105 00001996 66D1E9              <1> 	shr	cx, 1	; divide by 2 for 6845 handling
  1106 00001999 B40C                <1> 	mov	ah, 12	; 6845 register for start address
  1107 0000199B E8D3030000          <1> 	call	m16
  1108                              <1> 	;sal	bx, 1
  1109                              <1> 	; 01/09/2014
  1110 000019A0 D0E3                <1> 	shl	bl, 1	; *2 for word offset
  1111 000019A2 81C3[FE410100]      <1> 	add	ebx, CURSOR_POSN
  1112 000019A8 668B13              <1> 	mov	dx, [ebx] ; get cursor for this page
  1113                              <1> 	; 16/01/2016
  1114                              <1> 	;call	m18
  1115                              <1> 	;retn
  1116 000019AB E9AF030000          <1> 	jmp	m18
  1117                              <1> 
  1118                              <1> position:
  1119                              <1> 	; 24/06/2016
  1120                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  1121                              <1> 	; 27/06/2015
  1122                              <1> 	; 02/09/2014
  1123                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1124                              <1> 	; 04/12/2013 (Retro UNIX 8086 v1)
  1125                              <1> 	;
  1126                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1127                              <1> 	;
  1128                              <1> ;-----------------------------------------
  1129                              <1> ; POSITION
  1130                              <1> ;	THIS SERVICE ROUTINE CALCULATES THE REGEN BUFFER ADDRESS
  1131                              <1> ;	OF A CHARACTER IN THE ALPHA MODE
  1132                              <1> ; INPUT
  1133                              <1> ;	AX = ROW, COLUMN POSITION
  1134                              <1> ; OUTPUT
  1135                              <1> ;	AX = OFFSET OF CHAR POSITION IN REGEN BUFFER
  1136                              <1> ;-----------------------------------------
  1137                              <1> 
  1138                              <1> 	; DX = ROW, COLUMN POSITION
  1139 000019B0 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS] ; 24/06/2016
  1140 000019B7 F6E6                <1> 	mul	dh	 ; row value
  1141 000019B9 30F6                <1> 	xor	dh, dh   ; 0	
  1142 000019BB 6601D0              <1> 	add	ax, dx	 ; add column value to the result
  1143 000019BE 66D1E0              <1> 	shl	ax, 1	; * 2 for attribute bytes
  1144                              <1> 		; EAX = AX = OFFSET OF CHAR POSITION IN REGEN BUFFER 
  1145 000019C1 C3                  <1> 	retn
  1146                              <1> 
  1147                              <1> find_position:
  1148                              <1> 	; 24/06/2016
  1149                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  1150                              <1> 	; 27/06/2015
  1151                              <1> 	; 07/09/2014
  1152                              <1> 	; 02/09/2014
  1153                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1154                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1155                              <1> 
  1156 000019C2 0FB6CF              <1> 	movzx	ecx, bh ; video page number
  1157 000019C5 89CE                <1> 	mov	esi, ecx
  1158 000019C7 66D1E6              <1> 	shl	si, 1
  1159 000019CA 668B96[FE410100]    <1> 	mov	dx, [esi+CURSOR_POSN]
  1160 000019D1 740C                <1> 	jz	short p21
  1161 000019D3 6631F6              <1> 	xor	si, si
  1162                              <1> p20:
  1163 000019D6 660335[7C4F0100]    <1> 	add	si, [CRT_LEN] ; 24/06/2016
  1164                              <1> 	;add	si, 80*25*2 ; add length of buffer for one page		
  1165 000019DD E2F7                <1> 	loop	p20
  1166                              <1> p21:
  1167 000019DF 6621D2              <1> 	and	dx, dx
  1168 000019E2 7407                <1> 	jz	short p22
  1169 000019E4 E8C7FFFFFF          <1> 	call 	position ; determine location in regen in page
  1170 000019E9 01C6                <1> 	add	esi, eax ; add location to start of regen page
  1171                              <1> p22:	
  1172                              <1> 	;mov	dx, [addr_6845] ; get base address of active display			
  1173                              <1> 	;mov	dx, 03D4h ; I/O address of color card
  1174                              <1> 	;add	dx, 6	; point at status port
  1175 000019EB 66BADA03            <1> 	mov	dx, 03DAh ; status port
  1176                              <1> 	; cx = 0
  1177 000019EF C3                  <1> 	retn
  1178                              <1> 
  1179                              <1> SCROLL_UP:
  1180                              <1> 	; 07/07/2016
  1181                              <1> 	; 26/06/2016
  1182                              <1> 	; 12/05/2016
  1183                              <1> 	; 30/01/2016
  1184                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1185                              <1> 	; 07/09/2014
  1186                              <1> 	; 02/09/2014
  1187                              <1> 	; 01/09/2014 (Retro UNIX 386 v1 - beginning)
  1188                              <1> 	; 04/04/2014
  1189                              <1> 	; 04/12/2013
  1190                              <1> 	;
  1191                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1192                              <1> 	;
  1193                              <1> ;----------------------------------------------
  1194                              <1> ; SCROLL UP
  1195                              <1> ;	THIS ROUTINE MOVES A BLOCK OF CHARACTERS UP
  1196                              <1> ;	ON THE SCREEN
  1197                              <1> ; INPUT
  1198                              <1> ;	(AH) = CURRENT CRT MODE
  1199                              <1> ;	(AL) = NUMBER OF ROWS TO SCROLL
  1200                              <1> ;	(CX) = ROW/COLUMN OF UPPER LEFT CORNER
  1201                              <1> ;	(DX) = ROW/COLUMN OF LOWER RIGHT CORNER
  1202                              <1> ;	(BH) = ATTRIBUTE TO BE USED ON BLANKED LINE
  1203                              <1> ;	(DS) = DATA SEGMENT
  1204                              <1> ;	(ES) = REGEN BUFFER SEGMENT
  1205                              <1> ; OUTPUT
  1206                              <1> ;	NONE -- THE REGEN BUFFER IS MODIFIED
  1207                              <1> ;--------------------------------------------
  1208                              <1> 
  1209                              <1> 	; 07/07/2016
  1210 000019F0 38F5                <1> 	cmp	ch, dh
  1211 000019F2 0F875CFBFFFF        <1> 	ja	VIDEO_RETURN
  1212 000019F8 38D1                <1> 	cmp	cl, dl
  1213 000019FA 0F8754FBFFFF        <1> 	ja	VIDEO_RETURN
  1214                              <1> 	;
  1215 00001A00 E805000000          <1> 	call	_scroll_up
  1216 00001A05 E94AFBFFFF          <1>         jmp     VIDEO_RETURN
  1217                              <1> 
  1218                              <1> _scroll_up:  ; from 'write_tty'
  1219                              <1> 	;
  1220                              <1> 	; cl = left upper column
  1221                              <1> 	; ch = left upper row
  1222                              <1> 	; dl = right lower column
  1223                              <1> 	; dh = right lower row
  1224                              <1> 	;
  1225                              <1> 	; al = line count 
  1226                              <1> 	; bl = attribute to be used on blanked line	
  1227                              <1> 	; bh = video page number (0 to 7)
  1228                              <1> 
  1229 00001A0A E896000000          <1> 	call	test_line_count ; 16/01/2016
  1230                              <1> 
  1231 00001A0F 8A25[225E0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  1232                              <1> 	;cmp	ah, 4
  1233                              <1>  	;jb	short n0
  1234                              <1> 	;cmp	byte [CRT_MODE], 4
  1235 00001A15 80FC04              <1>         cmp	ah, 4 ; 07/07/2016
  1236 00001A18 0F8320050000        <1> 	jnb     GRAPHICS_UP ; 26/06/2016
  1237                              <1> 
  1238                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1239                              <1> 	;jne	GRAPHICS_UP
  1240                              <1> n0:
  1241                              <1> 	; 07/07/2016
  1242 00001A1E 80FF07              <1> 	cmp	bh, 7 ; video page number
  1243 00001A21 7606                <1> 	jna	short n1
  1244 00001A23 8A3D[0E420100]      <1> 	mov	bh, [ACTIVE_PAGE]
  1245                              <1> n1:
  1246 00001A29 88DC                <1> 	mov	ah, bl ; attribute
  1247 00001A2B 6650                <1> 	push	ax ; *
  1248                              <1> 	;mov 	esi, [CRT_BASE]
  1249 00001A2D BE00800B00          <1>         mov     esi, 0B8000h  
  1250 00001A32 3A3D[0E420100]      <1>         cmp     bh, [ACTIVE_PAGE]
  1251 00001A38 750B                <1> 	jne	short n2
  1252                              <1> 	;
  1253 00001A3A 66A1[FC410100]      <1>         mov     ax, [CRT_START]
  1254 00001A40 6601C6              <1>         add     si, ax
  1255 00001A43 EB11                <1>         jmp     short n4
  1256                              <1> n2:
  1257 00001A45 20FF                <1>         and     bh, bh
  1258 00001A47 740D                <1> 	jz	short n4
  1259 00001A49 88F8                <1> 	mov	al, bh
  1260                              <1> n3:
  1261 00001A4B 660335[7C4F0100]    <1>         add	si, [CRT_LEN]
  1262 00001A52 FEC8                <1>         dec	al
  1263 00001A54 75F5                <1> 	jnz	short n3
  1264                              <1> n4:	
  1265 00001A56 E85D000000          <1> 	call	scroll_position ; 16/01/2016
  1266 00001A5B 7420                <1>         jz      short n6 
  1267                              <1> 
  1268 00001A5D 01CE                <1>         add     esi, ecx ; from address for scroll
  1269 00001A5F 88F5                <1> 	mov	ch, dh  ; #rows in block
  1270 00001A61 28C5                <1> 	sub	ch, al	; #rows to be moved
  1271                              <1> n5:
  1272 00001A63 E894000000          <1> 	call	n10 ; 16/01/2016
  1273                              <1> 	
  1274 00001A68 51                  <1>         push	ecx
  1275 00001A69 0FB60D[245E0000]    <1> 	movzx	ecx, byte [CRT_COLS] 
  1276 00001A70 00C9                <1> 	add	cl, cl
  1277 00001A72 01CE                <1>         add	esi, ecx  ; next line
  1278 00001A74 01CF                <1>         add	edi, ecx
  1279 00001A76 59                  <1> 	pop	ecx
  1280                              <1> 
  1281 00001A77 FECD                <1> 	dec	ch	 ; count of lines to move
  1282 00001A79 75E8                <1> 	jnz	short n5 ; row loop
  1283                              <1> 	; ch = 0
  1284 00001A7B 88C6                <1> 	mov	dh, al	 ; #rows	
  1285                              <1> n6:
  1286                              <1> 	; attribute in ah
  1287 00001A7D B020                <1> 	mov	al, ' '	 ; fill with blanks
  1288                              <1> n7:
  1289 00001A7F E885000000          <1> 	call	n11 ; 16/01/2016
  1290                              <1> 
  1291 00001A84 8A0D[245E0000]      <1> 	mov	cl, [CRT_COLS]
  1292 00001A8A 00C9                <1> 	add	cl, cl
  1293 00001A8C 01CF                <1>         add	edi, ecx
  1294                              <1> 
  1295 00001A8E FECE                <1> 	dec	dh
  1296 00001A90 75ED                <1> 	jnz	short n7
  1297                              <1> n16:
  1298 00001A92 3A3D[0E420100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  1299 00001A98 750A                <1> 	jne	short n8
  1300                              <1> 	
  1301                              <1> 	;cmp	byte [CRT_MODE], 7	; is this the black and white card
  1302                              <1> 	;je	short n8		; if so, skip the mode reset
  1303                              <1> 
  1304 00001A9A A0[235E0000]        <1> 	mov	al, [CRT_MODE_SET] ; get the value of mode set
  1305 00001A9F 66BAD803            <1> 	mov	dx, 03D8h ; always set color card port
  1306 00001AA3 EE                  <1> 	out	dx, al
  1307                              <1> n8:
  1308 00001AA4 C3                  <1> 	retn
  1309                              <1> 
  1310                              <1> test_line_count:
  1311                              <1> 	; 12/05/2016
  1312                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1313                              <1> 	; 07/09/2014 (scroll_up)
  1314 00001AA5 08C0                <1> 	or	al, al
  1315 00001AA7 740E                <1> 	jz	short al_set2
  1316 00001AA9 6652                <1> 	push	dx
  1317 00001AAB 28EE                <1> 	sub	dh, ch  ; subtract upper row from lower row number
  1318 00001AAD FEC6                <1> 	inc	dh	; adjust difference by 1
  1319 00001AAF 38C6                <1> 	cmp	dh, al 	; line count = amount of rows in window?
  1320 00001AB1 7502                <1> 	jne	short al_set1 ; if not the we're all set
  1321 00001AB3 30C0                <1> 	xor	al, al	; otherwise set al to zero
  1322                              <1> al_set1:
  1323 00001AB5 665A                <1> 	pop	dx
  1324                              <1> al_set2:
  1325 00001AB7 C3                  <1> 	retn
  1326                              <1> 
  1327                              <1> scroll_position:
  1328                              <1> 	; 26/06/2016
  1329                              <1> 	; 30/01/2016
  1330                              <1>         ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1331                              <1> 	; 07/09/2014 (scroll_up)
  1332                              <1> 
  1333 00001AB8 6652                <1> 	push	dx
  1334 00001ABA 6689CA              <1> 	mov	dx, cx	; now, upper left position in DX
  1335 00001ABD E8EEFEFFFF          <1> 	call	position
  1336 00001AC2 01C6                <1> 	add	esi, eax
  1337 00001AC4 89F7                <1> 	mov	edi, esi
  1338 00001AC6 665A                <1> 	pop	dx	; lower right position in DX
  1339 00001AC8 6629CA              <1> 	sub	dx, cx
  1340 00001ACB FEC6                <1> 	inc	dh	; dh = #rows 
  1341 00001ACD FEC2                <1> 	inc	dl	; dl = #cols in block
  1342 00001ACF 59                  <1> 	pop	ecx 	; return address
  1343 00001AD0 6658                <1> 	pop	ax	; * ; al = line count, ah = attribute
  1344 00001AD2 51                  <1> 	push	ecx	; return address
  1345 00001AD3 0FB7C8              <1> 	movzx	ecx, ax
  1346 00001AD6 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS]
  1347 00001ADC F6E4                <1> 	mul	ah	; determine offset to from address
  1348 00001ADE 6601C0              <1> 	add	ax, ax  ; *2 for attribute byte
  1349                              <1> 	;
  1350 00001AE1 6650                <1> 	push	ax	; offset 
  1351 00001AE3 6652                <1> 	push	dx
  1352                              <1> 	;
  1353                              <1> 	; 04/04/2014
  1354 00001AE5 66BADA03            <1> 	mov	dx, 3DAh ; guaranteed to be color card here	
  1355                              <1> n9:                      ; wait_display_enable
  1356 00001AE9 EC                  <1>         in      al, dx   ; get port
  1357 00001AEA A808                <1> 	test	al, RVRT ; wait for vertical retrace	
  1358 00001AEC 74FB                <1> 	jz	short n9 ; wait_display_enable
  1359 00001AEE B025                <1> 	mov	al, 25h
  1360 00001AF0 B2D8                <1> 	mov	dl, 0D8h ; address control port
  1361 00001AF2 EE                  <1> 	out	dx, al	; turn off video during vertical retrace
  1362 00001AF3 665A                <1> 	pop	dx	; #rows, #cols
  1363 00001AF5 6658                <1>        	pop	ax	; offset
  1364 00001AF7 6691                <1> 	xchg	ax, cx	; 
  1365                              <1> 	; ecx = offset, al = line count, ah = attribute
  1366                              <1> 	;
  1367 00001AF9 08C0                <1> 	or	al, al
  1368 00001AFB C3                  <1> 	retn
  1369                              <1> n10:
  1370                              <1> 	; Move rows
  1371 00001AFC 88D1                <1> 	mov	cl, dl	; get # of cols to move
  1372 00001AFE 56                  <1> 	push	esi
  1373 00001AFF 57                  <1> 	push	edi	; save start address
  1374                              <1> n10r:
  1375 00001B00 66A5                <1> 	movsw		; move that line on screen
  1376 00001B02 FEC9                <1> 	dec	cl
  1377 00001B04 75FA                <1>         jnz     short n10r
  1378 00001B06 5F                  <1> 	pop	edi
  1379 00001B07 5E                  <1> 	pop	esi	; recover addresses
  1380 00001B08 C3                  <1> 	retn
  1381                              <1> n11:
  1382                              <1> 	; Clear rows
  1383                              <1>                 	; dh =  #rows
  1384 00001B09 88D1                <1>         mov	cl, dl	; get # of cols to clear
  1385 00001B0B 57                  <1>         push    edi     ; save address
  1386                              <1> n11r:
  1387 00001B0C 66AB                <1>         stosw           ; store fill character
  1388 00001B0E FEC9                <1> 	dec	cl
  1389 00001B10 75FA                <1>         jnz     short n11r
  1390 00001B12 5F                  <1>         pop     edi     ; recover address
  1391 00001B13 C3                  <1> 	retn
  1392                              <1> 
  1393                              <1> SCROLL_DOWN:
  1394                              <1> 	; 07/07/2016
  1395                              <1> 	; 27/06/2016
  1396                              <1> 	; 26/06/2016
  1397                              <1> 	; 12/05/2016
  1398                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1399                              <1> 	;
  1400                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1401                              <1> 
  1402                              <1> ;------------------------------------------
  1403                              <1> ; SCROLL DOWN
  1404                              <1> ;	THIS ROUTINE MOVES THE CHARACTERS WITHIN A DEFINED
  1405                              <1> ;	BLOCK DOWN ON THE SCREEN, FILLING THE TOP LINES
  1406                              <1> ;	WITH A DEFINED CHARACTER
  1407                              <1> ; INPUT
  1408                              <1> ;	(AH) = CURRENT CRT MODE
  1409                              <1> ;	(AL) = NUMBER OF LINES TO SCROLL
  1410                              <1> ;	(CX) = UPPER LEFT CORNER OF RECION
  1411                              <1> ;	(DX) = LOWER RIGHT CORNER OF REGION
  1412                              <1> ;	(BH) = FILL CHARACTER
  1413                              <1> ;	(DS) = DATA SEGMENT
  1414                              <1> ;	(ES) = REGEN SEGMENT
  1415                              <1> ; OUTPUT
  1416                              <1> ;	NONE -- SCREEN IS SCROLLED
  1417                              <1> ;------------------------------------------
  1418                              <1> 
  1419                              <1> 	; 07/07/2016
  1420 00001B14 38F5                <1> 	cmp	ch, dh
  1421 00001B16 0F8738FAFFFF        <1> 	ja	VIDEO_RETURN
  1422 00001B1C 38D1                <1> 	cmp	cl, dl
  1423 00001B1E 0F8730FAFFFF        <1> 	ja	VIDEO_RETURN
  1424                              <1> 	;
  1425 00001B24 E805000000          <1> 	call	_scroll_down
  1426 00001B29 E926FAFFFF          <1>         jmp     VIDEO_RETURN
  1427                              <1> 
  1428                              <1> _scroll_down: ; 27/06/2016
  1429                              <1> 
  1430                              <1> 	; cl = left upper column
  1431                              <1> 	; ch = left upper row
  1432                              <1> 	; dl = right lower column
  1433                              <1> 	; dh = right lower row
  1434                              <1> 	;
  1435                              <1> 	; al = line count 
  1436                              <1> 	; bl = attribute to be used on blanked line	
  1437                              <1> 	; bh = video page number (0 to 7)
  1438                              <1> 
  1439                              <1> 	; !!!!
  1440 00001B2E FD                  <1> 	std		; DIRECTION FOR SCROLL DOWN
  1441                              <1> 	; !!!!
  1442 00001B2F E871FFFFFF          <1> 	call	test_line_count ; 16/01/2016
  1443                              <1> 	
  1444 00001B34 8A25[225E0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  1445                              <1> 	;cmp	ah, 4
  1446                              <1>  	;jb	short _n0
  1447                              <1> 	;cmp	byte [CRT_MODE], 4
  1448 00001B3A 80FC04              <1>         cmp	ah, 4 ; 07/07/2016
  1449 00001B3D 0F83DF070000        <1> 	jnb     GRAPHICS_DOWN ; 26/06/2016
  1450                              <1> 
  1451                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1452                              <1> 	;jne	GRAPHICS_DOWN
  1453                              <1> _n0:
  1454                              <1> 	; 07/07/2016
  1455 00001B43 80FF07              <1> 	cmp	bh, 7 ; video page number
  1456 00001B46 7606                <1> 	jna	short n12
  1457 00001B48 8A3D[0E420100]      <1> 	mov	bh, [ACTIVE_PAGE]
  1458                              <1> 	;
  1459                              <1> n12:			; CONTINUE_DOWN
  1460 00001B4E 88DC                <1> 	mov	ah, bl
  1461 00001B50 6650                <1> 	push	ax	; * ; save attribute in ah
  1462 00001B52 6689D0              <1> 	mov	ax, dx	; LOWER RIGHT CORNER
  1463 00001B55 E85EFFFFFF          <1> 	call	scroll_position	; GET REGEN LOCATION
  1464 00001B5A 741F                <1> 	jz	short n14
  1465 00001B5C 29CE                <1> 	sub	esi, ecx  ; SI IS FROM ADDRESS
  1466 00001B5E 88F5                <1> 	mov	ch, dh  ; #rows in block
  1467 00001B60 28C5                <1> 	sub	ch, al	; #rows to be moved
  1468                              <1> n13:
  1469 00001B62 E895FFFFFF          <1> 	call	n10	; MOVE ONE ROW
  1470                              <1> 
  1471 00001B67 51                  <1> 	push	ecx
  1472 00001B68 8A0D[245E0000]      <1> 	mov	cl, [CRT_COLS] 
  1473 00001B6E 00C9                <1> 	add	cl, cl
  1474 00001B70 29CE                <1>         sub	esi, ecx  ; next line
  1475 00001B72 29CF                <1>         sub	edi, ecx
  1476 00001B74 59                  <1>         pop	ecx
  1477                              <1> 	
  1478 00001B75 FECD                <1> 	dec	ch	 ; count of lines to move
  1479 00001B77 75E9                <1> 	jnz	short n13 ; row loop
  1480                              <1> 	; ch = 0
  1481 00001B79 88C6                <1> 	mov	dh, al	 ; #rows
  1482                              <1> n14:
  1483                              <1> 	; attribute in ah
  1484 00001B7B B020                <1> 	mov	al, ' '	 ; fill with blanks
  1485                              <1> n15:
  1486 00001B7D E887FFFFFF          <1> 	call	n11 ; 16/01/2016
  1487                              <1> 
  1488 00001B82 8A0D[245E0000]      <1> 	mov	cl, [CRT_COLS]
  1489 00001B88 00C9                <1> 	add	cl, cl
  1490 00001B8A 29CF                <1>         sub	edi, ecx
  1491                              <1>         
  1492 00001B8C FECE                <1> 	dec	dh
  1493 00001B8E 75ED                <1> 	jnz	short n15
  1494                              <1> 	;
  1495 00001B90 E9FDFEFFFF          <1> 	jmp	n16 ; 27/06/2016
  1496                              <1> 
  1497                              <1> ;	cmp	bh, [ACTIVE_PAGE]
  1498                              <1> ;	jne	short n16
  1499                              <1> ;
  1500                              <1> ;	;cmp	byte [CRT_MODE], 7	; is this the black and white card
  1501                              <1> ;	;je	short n16		; if so, skip the mode reset
  1502                              <1> ;
  1503                              <1> ;	mov	al, [CRT_MODE_SET] ; get the value of mode set
  1504                              <1> ;	mov	dx, 03D8h ; always set color card port
  1505                              <1> ;	out	dx, al
  1506                              <1> ;n16:
  1507                              <1> ;	; !!!!
  1508                              <1> ;	cld		; Clear direction flag !
  1509                              <1> ;	; !!!!
  1510                              <1> ;	retn
  1511                              <1> 
  1512                              <1> READ_AC_CURRENT:
  1513                              <1> 	; 08/07/2016
  1514                              <1> 	; 26/06/2016
  1515                              <1> 	; 12/05/2016
  1516                              <1> 	; 18/01/2016
  1517                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1518                              <1> 	;
  1519                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1520                              <1> 	;
  1521                              <1> 	; 08/07/2016
  1522 00001B95 803D[225E0000]07    <1>         cmp     byte [CRT_MODE], 7 ; 6!?
  1523 00001B9C 7607                <1> 	jna	short read_ac_c
  1524 00001B9E 31C0                <1> 	xor	eax, eax
  1525 00001BA0 E9B4F9FFFF          <1>         jmp     _video_return 
  1526                              <1> read_ac_c:
  1527 00001BA5 E805000000          <1> 	call	_read_ac_current
  1528                              <1> 	; 12/05/2016
  1529                              <1>         ;jmp     VIDEO_RETURN
  1530 00001BAA E9AAF9FFFF          <1> 	jmp	_video_return
  1531                              <1> 
  1532                              <1> ;------------------------------------------------------------------------
  1533                              <1> ; READ_AC_CURRENT							:
  1534                              <1> ;	THIS ROUTINE READS THE ATTRIBUTE AND CHARACTER AT THE CURRENT	:
  1535                              <1> ;	CURSOR POSITION AND RETURNS THEM TO THE CALLER			:
  1536                              <1> ; INPUT									:
  1537                              <1> ;	(AH) = CURRENT CRT MODE						:
  1538                              <1> ;	(BH) = DISPLAY PAGE ( ALPHA MODES ONLY )			:
  1539                              <1> ;	(DS) = DATA SEGMENT						:
  1540                              <1> ;	(ES) = REGEN SEGMENT						:
  1541                              <1> ; OUTPUT								:
  1542                              <1> ;	(AL) = CHARACTER READ						:
  1543                              <1> ;	(AH) = ATTRIBUTE READ						:
  1544                              <1> ;------------------------------------------------------------------------
  1545                              <1> 
  1546                              <1> _read_ac_current:
  1547                              <1> 	; 26/06/2016
  1548                              <1> 	; 12/05/2016 
  1549                              <1> 	; 18/01/2016
  1550                              <1> 
  1551                              <1> 	;mov	ah, [CRT_MODE] ; current video mode	
  1552                              <1> 	;cmp	ah, 4
  1553                              <1>  	;jb	short p10
  1554 00001BAF 803D[225E0000]04    <1> 	cmp	byte [CRT_MODE], 4
  1555 00001BB6 0F83BB080000        <1> 	jnb     GRAPHICS_READ ; 26/06/2016
  1556                              <1> 
  1557                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1558                              <1> 	;jne	GRAPHICS_READ
  1559                              <1> p10:
  1560 00001BBC E801FEFFFF          <1> 	call	find_position	; GET REGEN LOCATION AND PORT ADDRESS
  1561                              <1> 	;
  1562                              <1> 	; esi = regen location
  1563                              <1> 	; dx = status port
  1564                              <1> 	;
  1565 00001BC1 8A25[225E0000]      <1> 	mov	ah, [CRT_MODE]	
  1566 00001BC7 80EC02              <1> 	sub	ah, 2
  1567 00001BCA D0EC                <1> 	shr	ah, 1
  1568 00001BCC 7515                <1> 	jnz	short p13
  1569                              <1> 
  1570                              <1> 	; WAIT FOR HORIZONTAL RETRACE OR VERTICAL RETRACE IF COLOR 80
  1571                              <1> p11:
  1572 00001BCE FB                  <1> 	sti		; enable interrupts first
  1573 00001BCF 3A3D[0E420100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  1574 00001BD5 750C                <1> 	jne	short p13 
  1575 00001BD7 FA                  <1> 	cli 		; block interrupts for single loop
  1576 00001BD8 EC                  <1> 	in	al, dx	; get status from the adapter
  1577 00001BD9 A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  1578 00001BDB 75F1                <1> 	jnz	short p11 ; wait until it is
  1579                              <1> p12:			;  wait for either retrace high
  1580 00001BDD EC                  <1> 	in	al, dx ; get status again
  1581 00001BDE A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  1582 00001BE0 74FB                <1> 	jz	short p12 ; wait until either retrace active
  1583 00001BE2 FB                  <1> 	sti
  1584                              <1> p13:
  1585 00001BE3 81C600800B00        <1> 	add	esi, 0B8000h 
  1586 00001BE9 668B06              <1> 	mov	ax, [esi]
  1587                              <1> 
  1588 00001BEC C3                  <1> 	retn	; 18/01/2016
  1589                              <1> 
  1590                              <1> WRITE_AC_CURRENT:
  1591                              <1> 	; 08/07/2016
  1592                              <1> 	; 26/06/2016
  1593                              <1> 	; 24/06/2016
  1594                              <1> 	; 12/05/2016
  1595                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1596                              <1> 	;
  1597                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1598                              <1> 	;
  1599                              <1> ;----------------------------------------------------------------
  1600                              <1> ; WRITE_AC_CURRENT						:
  1601                              <1> ;	THTS ROUTINE WRITES THE ATTRIBUTE AND CHARACTER		:
  1602                              <1> ;	AT THE CURRENT CURSOR POSITION				:
  1603                              <1> ; INPUT								:
  1604                              <1> ;	(AH) = CURRENT CRT MODE					:
  1605                              <1> ;	(BH) = DISPLAY PAGE					:
  1606                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE			:
  1607                              <1> ;	(AL) = CHAR TO WRITE					:
  1608                              <1> ;	(BL) = ATTRIBUTE OF CHAR TO WRITE			:
  1609                              <1> ;	(DS) = DATA SEGMENT					:
  1610                              <1> ;	(ES) = REGEN SEGMENT					:
  1611                              <1> ; OUTPUT							:
  1612                              <1> ;	DISPLAY REGEN BUFFER UPDATED				:
  1613                              <1> ;----------------------------------------------------------------
  1614                              <1> 
  1615                              <1> 	; 08/07/2016
  1616 00001BED 803D[225E0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  1617 00001BF4 760A                <1> 	jna	short write_ac_c
  1618                              <1> 
  1619 00001BF6 E8F20A0000          <1> 	call	vga_write_char_attr
  1620 00001BFB E954F9FFFF          <1> 	jmp     VIDEO_RETURN	
  1621                              <1> 
  1622                              <1> write_ac_c:
  1623 00001C00 E834000000          <1> 	call	_write_c_current
  1624                              <1> 
  1625 00001C05 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  1626 00001C08 889E[2B5E0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  1627                              <1> 
  1628 00001C0E E941F9FFFF          <1>         jmp     VIDEO_RETURN
  1629                              <1> 
  1630                              <1> WRITE_C_CURRENT:
  1631                              <1> 	; 08/07/2016
  1632                              <1> 	; 26/06/2016
  1633                              <1> 	; 12/05/2016
  1634                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1635                              <1> 	;
  1636                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1637                              <1> 	;
  1638                              <1> ;----------------------------------------------------------------
  1639                              <1> ; WRITE_C_CURRENT						:
  1640                              <1> ;	THIS ROUTINE WRITES THE CHARACTER AT			:
  1641                              <1> ;	THE CURRENT CURSOR POSITION, ATTRIBUTE UNCHANGED	:
  1642                              <1> ; INPUT								:
  1643                              <1> ;	(AH) = CURRENT CRT MODE					:
  1644                              <1> ;	(BH) = DISPLAY PAGE					:
  1645                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE			:
  1646                              <1> ;	(AL) = CHAR TO WRITE					:
  1647                              <1> ;	(DS) = DATA SEGMENT					:
  1648                              <1> ;	(ES) = REGEN SEGMENT					:
  1649                              <1> ; OUTPUT							:
  1650                              <1> ;	DISPLAY REGEN BUFFER UPDATED				:
  1651                              <1> ;----------------------------------------------------------------
  1652                              <1> 
  1653                              <1> 	; 08/07/2016
  1654 00001C13 803D[225E0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  1655 00001C1A 760A                <1> 	jna	short write_c_c
  1656                              <1> 
  1657 00001C1C E8CC0A0000          <1> 	call	vga_write_char_only
  1658 00001C21 E92EF9FFFF          <1> 	jmp     VIDEO_RETURN	
  1659                              <1> 
  1660                              <1> write_c_c:
  1661                              <1> 	;and	bh, 7 ; video page number (<= 7)
  1662 00001C26 0FB6F7              <1> 	movzx	esi, bh	
  1663 00001C29 8A9E[2B5E0000]      <1> 	mov	bl, [esi+chr_attrib]
  1664                              <1> 
  1665 00001C2F E805000000          <1> 	call	_write_c_current
  1666 00001C34 E91BF9FFFF          <1>         jmp     VIDEO_RETURN
  1667                              <1> 
  1668                              <1> _write_c_current:  ; from 'write_tty'
  1669                              <1> 	; 26/06/2016
  1670                              <1> 	; 24/06/2016
  1671                              <1> 	; 12/05/2016
  1672                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1673                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1674                              <1> 	; 18/01/2014
  1675                              <1> 	; 04/12/2013
  1676                              <1> 	;
  1677                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1678                              <1> 
  1679                              <1> 	;mov	ah, [CRT_MODE] ; current video mode	
  1680                              <1> 	;cmp	ah, 4
  1681                              <1>  	;jb	short p40
  1682 00001C39 803D[225E0000]04    <1> 	cmp	byte [CRT_MODE], 4
  1683 00001C40 0F8381070000        <1>         jnb     GRAPHICS_WRITE ; 26/06/2016
  1684                              <1> 
  1685                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1686                              <1> 	;jne	GRAPHICS_WRITE
  1687                              <1> p40:
  1688                              <1> 	; al = character
  1689                              <1> 	; bl = color/attribute
  1690                              <1> 	; bh = video page
  1691                              <1> 	; cx = count of characters to write
  1692 00001C46 6652                <1> 	push	dx
  1693 00001C48 88DC                <1> 	mov	ah, bl  ; color/attribute (12/05/2016)
  1694 00001C4A 6650                <1> 	push	ax	; save character & attribute/color
  1695 00001C4C 6651                <1> 	push	cx
  1696 00001C4E E86FFDFFFF          <1> 	call 	find_position  ; get regen location and port address
  1697 00001C53 6659                <1> 	pop	cx
  1698                              <1> 	; esi = regen location
  1699                              <1> 	; dx = status port
  1700                              <1> 	;
  1701 00001C55 81C600800B00        <1> 	add	esi, 0B8000h ; 30/08/2014 (crt_base) 
  1702                              <1> 	;
  1703 00001C5B 8A25[225E0000]      <1> 	mov	ah, [CRT_MODE]	
  1704 00001C61 80EC02              <1> 	sub	ah, 2
  1705 00001C64 D0EC                <1> 	shr	ah, 1
  1706 00001C66 7519                <1> 	jnz	short p44    ; 26/06/2016
  1707                              <1> 
  1708                              <1> 	; WAIT FOR HORIZONTAL RETRACE OR VERTICAL RETRACE IF COLOR 80
  1709                              <1> p41:
  1710 00001C68 FB                  <1> 	sti		; enable interrupts first
  1711 00001C69 3A3D[0E420100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  1712 00001C6F 7510                <1> 	jne	short p44 
  1713 00001C71 FA                  <1> 	cli 		; block interrupts for single loop
  1714 00001C72 EC                  <1> 	in	al, dx	; get status from the adapter
  1715 00001C73 A808                <1> 	test	al, RVRT ; check for vertical retrace first
  1716 00001C75 7509                <1> 	jnz	short p43 ; Do fast write now if vertical retrace
  1717 00001C77 A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  1718 00001C79 75ED                <1> 	jnz	short p41 ; wait until it is
  1719                              <1> p42:			;  wait for either retrace high
  1720 00001C7B EC                  <1> 	in	al, dx ; get status again
  1721 00001C7C A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  1722 00001C7E 74FB                <1> 	jz	short p42 ; wait until either retrace active
  1723                              <1> p43:	
  1724 00001C80 FB                  <1> 	sti
  1725                              <1> p44:
  1726 00001C81 668B0424            <1> 	mov	ax, [esp] ; restore the character (al) & attribute (ah)
  1727 00001C85 668906              <1> 	mov	[esi], ax
  1728                              <1> 
  1729 00001C88 6649                <1> 	dec	cx
  1730 00001C8A 7404                <1> 	jz	short p45
  1731                              <1> 
  1732 00001C8C 46                  <1> 	inc	esi
  1733 00001C8D 46                  <1> 	inc	esi
  1734 00001C8E EBD8                <1> 	jmp	short p41
  1735                              <1> p45:	
  1736 00001C90 6658                <1> 	pop	ax
  1737 00001C92 665A                <1> 	pop	dx
  1738 00001C94 C3                  <1> 	retn
  1739                              <1> 
  1740                              <1> ; 09/07/2016
  1741                              <1> ; 26/06/2016
  1742                              <1> ; 24/06/2016
  1743                              <1> ; 12/05/2016
  1744                              <1> ; 18/01/2016
  1745                              <1> ; 16/01/2016 - TRDOS 386 (TRDOS v2.0)
  1746                              <1> ; 30/06/2015
  1747                              <1> ; 27/06/2015
  1748                              <1> ; 11/03/2015
  1749                              <1> ; 02/09/2014
  1750                              <1> ; 30/08/2014
  1751                              <1> ; VIDEO FUNCTIONS
  1752                              <1> ; (write_tty - Retro UNIX 8086 v1 - U9.ASM, 01/02/2014)
  1753                              <1> 
  1754                              <1> WRITE_TTY:
  1755                              <1> 	; 09/07/2016
  1756                              <1> 	; 01/07/2016
  1757                              <1> 	; 26/06/2016
  1758                              <1> 	; 24/06/2016
  1759                              <1> 	; 13/05/2016
  1760                              <1> 	; 12/05/2016
  1761                              <1> 	; 30/01/2016
  1762                              <1> 	; 18/01/2016
  1763                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1764                              <1> 	; 13/08/2015
  1765                              <1> 	; 02/09/2014
  1766                              <1> 	; 30/08/2014 (Retro UNIX 386 v1 - beginning)
  1767                              <1> 	; 01/02/2014 (Retro UNIX 8086 v1 - last update)
  1768                              <1> 	; 03/12/2013 (Retro UNIX 8086 v1 - beginning)	
  1769                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI, EDI)
  1770                              <1> 	;
  1771                              <1> 	; INPUT -> AL = Character to be written
  1772                              <1> 	;	   BL = Color (Forecolor, Backcolor)
  1773                              <1> 	;	   BH = Video Page (0 to 7)
  1774                              <1> 
  1775                              <1> 	; 09/07/2016
  1776 00001C95 803D[225E0000]07    <1>         cmp     byte [CRT_MODE], 7
  1777 00001C9C 760A                <1> 	jna 	short write_tty_cga
  1778                              <1> 
  1779 00001C9E E8290D0000          <1> 	call	vga_write_teletype
  1780 00001CA3 E9ACF8FFFF          <1> 	jmp	VIDEO_RETURN
  1781                              <1> 
  1782                              <1> write_tty_cga:
  1783                              <1> 	; 13/05/2016
  1784                              <1> 	;call	_write_tty
  1785                              <1> 	; 01/07/2016
  1786 00001CA8 E818000000          <1> 	call	_write_tty_m3
  1787 00001CAD E9A2F8FFFF          <1> 	jmp	VIDEO_RETURN
  1788                              <1> 
  1789                              <1> RVRT	equ	00001000b	; VIDEO VERTICAL RETRACE BIT
  1790                              <1> RHRZ	equ	00000001b	; VIDEO HORIZONTAL RETRACE BIT
  1791                              <1> 
  1792                              <1> ; Derived from "WRITE_TTY" procedure of IBM "pc-at" rombios source code
  1793                              <1> ; (06/10/1985), 'video.asm', INT 10H, VIDEO_IO
  1794                              <1> ;
  1795                              <1> ; 06/10/85  VIDEO DISPLAY BIOS
  1796                              <1> ;
  1797                              <1> ;--- WRITE_TTY ------------------------------------------------------------------
  1798                              <1> ;										:
  1799                              <1> ;   THIS INTERFACE PROVIDES A TELETYPE LIKE INTERFACE TO THE			:
  1800                              <1> ;   VIDEO CARDS. THE INPUT CHARACTER IS WRITTEN TO THE CURRENT			:
  1801                              <1> ;   CURSOR POSITION, AND THE CURSOR IS MOVED TO THE NEXT POSITION.		:
  1802                              <1> ;   IF THE CURSOR LEAVES THE LAST COLUMN OF THE FIELD, THE COLUMN		:
  1803                              <1> ;   IS SET TO ZERO, AND THE ROW VALUE IS INCREMENTED. IF THE ROW		:
  1804                              <1> ;   ROW VALUE LEAVES THE FIELD, THE CURSOR IS PLACED ON THE LAST ROW,		:
  1805                              <1> ;   FIRST COLUMN, AND THE ENTIRE SCREEN IS SCROLLED UP ONE LINE.		:
  1806                              <1> ;   WHEN THE SCREEN IS SCROLLED UP, THE ATTRIBUTE FOR FILLING THE		:
  1807                              <1> ;   NEWLY BLANKED LINE IS READ FROM THE CURSOR POSITION ON THE PREVIOUS		:
  1808                              <1> ;   LINE BEFORE THE SCROLL, IN CHARACTER MODE. IN GRAPHICS MODE,		:
  1809                              <1> ;   THE 0 COLOR IS USED.							:
  1810                              <1> ;   ENTRY --									:
  1811                              <1> ;     (AH) = CURRENT CRT MODE							:
  1812                              <1> ;     (AL) = CHARACTER TO BE WRITTEN						:
  1813                              <1> ;	    NOTE THAT BACK SPACE, CARRIAGE RETURN, BELL AND LINE FEED ARE	:
  1814                              <1> ;	    HANDLED AS COMMANDS RATHER THAN AS DISPLAY GRAPHICS CHARACTERS	:
  1815                              <1> ;     (BL) = FOREGROUND COLOR FOR CHAR WRITE IF CURRENTLY IN A GRAPHICS MODE	:
  1816                              <1> ;   EXIT -- 									:
  1817                              <1> ;     ALL REGISTERS SAVED							:
  1818                              <1> ;--------------------------------------------------------------------------------
  1819                              <1> 
  1820                              <1> ; 08/07/2016
  1821                              <1> ; 26/06/2016
  1822                              <1> ; 24/06/2016
  1823                              <1> _write_tty:	; 13/05/2016
  1824 00001CB2 FA                  <1> 	cli
  1825                              <1> 	;
  1826                              <1> 	; 01/09/2014
  1827 00001CB3 803D[225E0000]03    <1> 	cmp	byte [CRT_MODE], 3
  1828 00001CBA 7409                <1> 	je	short _write_tty_m3
  1829                              <1> 	;
  1830                              <1> set_mode_3:
  1831 00001CBC 53                  <1> 	push	ebx
  1832 00001CBD 50                  <1> 	push	eax
  1833 00001CBE E8A2F8FFFF          <1> 	call	_set_mode
  1834 00001CC3 58                  <1> 	pop	eax
  1835 00001CC4 5B                  <1> 	pop	ebx
  1836                              <1> 	;
  1837                              <1> _write_tty_m3: ; 24/06/2016 (m3 -> _write_tty_m3)
  1838 00001CC5 0FB6F7              <1> 	movzx 	esi, bh ; 12/05/2016
  1839 00001CC8 66D1E6              <1> 	shl	si, 1
  1840 00001CCB 81C6[FE410100]      <1> 	add	esi, CURSOR_POSN
  1841 00001CD1 668B16              <1> 	mov	dx, [esi]
  1842                              <1> 	;
  1843                              <1> 	; dx now has the current cursor position
  1844                              <1> 	;
  1845 00001CD4 3C0D                <1> 	cmp	al, 0Dh	; CR	; is it carriage return or control character
  1846 00001CD6 7636                <1> 	jbe	short u8
  1847                              <1> 	;
  1848                              <1> 	; write the char to the screen
  1849                              <1> u0:	
  1850                              <1> 	; al = character
  1851                              <1> 	; bl = attribute/color
  1852                              <1> 	; bh = video page number (0 to 7)
  1853                              <1> 	;
  1854 00001CD8 66B90100            <1> 	mov	cx, 1  ; 24/06/2016
  1855                              <1> 	; cx = count of characters to write
  1856                              <1> 	;
  1857 00001CDC E858FFFFFF          <1> 	call	_write_c_current ; 16/01/2015
  1858                              <1> 	;
  1859                              <1> 	; position the cursor for next char
  1860 00001CE1 FEC2                <1> 	inc	dl		; next column
  1861 00001CE3 3A15[245E0000]      <1> 	cmp	dl, [CRT_COLS]  ; test for column overflow 
  1862 00001CE9 755D                <1>         jne     _set_cpos
  1863 00001CEB B200                <1> 	mov	dl, 0		; column = 0
  1864                              <1> u10:				; (line feed found)
  1865 00001CED 80FE18              <1> 	cmp	dh, 25-1 	; check for last row
  1866 00001CF0 7218                <1> 	jb 	short u6
  1867                              <1> 	;
  1868                              <1> 	; scroll required
  1869                              <1> u1:	
  1870                              <1> 	; SET CURSOR POSITION (04/12/2013)
  1871 00001CF2 E851000000          <1> 	call	_set_cpos
  1872                              <1> 	;
  1873                              <1> 	; determine value to fill with during scroll
  1874                              <1> u2:
  1875                              <1> 	; bh = video page number
  1876                              <1> 	;
  1877 00001CF7 E8B3FEFFFF          <1> 	call	_read_ac_current ; 18/01/2016
  1878                              <1> 	;
  1879                              <1> 	; al = character, ah = attribute
  1880                              <1> 	; bh = video page number 	
  1881                              <1> u3:
  1882                              <1> 	;;mov	ax, 0601h 	; scroll one line
  1883                              <1> 	;;sub	cx, cx		; upper left corner
  1884                              <1> 	;;mov	dh, 25-1 	; lower right row
  1885                              <1> 	;;;mov	dl, [CRT_COLS]
  1886                              <1> 	;mov	dl, 80		; lower right column	
  1887                              <1> 	;;dec	dl
  1888                              <1> 	;;mov	dl, 79
  1889                              <1> 
  1890                              <1> 	;;call	scroll_up	; 04/12/2013
  1891                              <1> 	;;; 11/03/2015
  1892                              <1> 	; 02/09/2014
  1893                              <1> 	;;;mov	cx, [crt_ulc] ; Upper left corner  (0000h)
  1894                              <1> 	;;;mov	dx, [crt_lrc] ; Lower right corner (184Fh)
  1895                              <1> 	; 11/03/2015
  1896 00001CFC 6629C9              <1> 	sub	cx, cx
  1897 00001CFF 66BA4F18            <1> 	mov	dx, 184Fh ; dl = 79 (column), dh = 24 (row)
  1898                              <1> 	;
  1899 00001D03 B001                <1> 	mov	al, 1		; scroll 1 line up
  1900                              <1> 		; ah = attribute
  1901                              <1> 	;mov	bl, al ; 12/05/2016
  1902 00001D05 E900FDFFFF          <1> 	jmp	_scroll_up	; 16/01/2016
  1903                              <1> ;u4:
  1904                              <1> 	;;int	10h		; video-call return
  1905                              <1> 				; scroll up the screen
  1906                              <1> 				; tty return
  1907                              <1> ;u5:
  1908                              <1> 	;retn			; return to the caller
  1909                              <1> 
  1910                              <1> u6:				; set-cursor-inc
  1911 00001D0A FEC6                <1> 	inc	dh		; next row
  1912                              <1> 				; set cursor
  1913                              <1> ;u7:					
  1914                              <1> 	;;mov	ah, 02h
  1915                              <1> 	;;jmp	short u4 	; establish the new cursor
  1916                              <1> 	;call	_set_cpos
  1917                              <1> 	;jmp 	short u5
  1918 00001D0C EB3A                <1> 	jmp     _set_cpos
  1919                              <1> 
  1920                              <1> 	; check for control characters
  1921                              <1> u8:
  1922 00001D0E 7436                <1> 	je	short u9
  1923 00001D10 3C0A                <1> 	cmp	al, 0Ah		; is it a line feed (0Ah)
  1924 00001D12 74D9                <1> 	je	short u10
  1925 00001D14 3C07                <1> 	cmp	al, 07h 	; is it a bell
  1926 00001D16 747A                <1> 	je	short u11
  1927 00001D18 3C08                <1> 	cmp	al, 08h		; is it a backspace
  1928                              <1> 	;jne	short u0
  1929 00001D1A 7422                <1> 	je	short bs	; 12/12/2013
  1930                              <1> 	; 12/12/2013 (tab stop)
  1931 00001D1C 3C09                <1> 	cmp	al, 09h		; is it a tab stop
  1932 00001D1E 75B8                <1> 	jne	short u0
  1933 00001D20 88D0                <1> 	mov	al, dl
  1934 00001D22 6698                <1> 	cbw
  1935 00001D24 B108                <1> 	mov	cl, 8
  1936 00001D26 F6F1                <1> 	div	cl
  1937 00001D28 28E1                <1> 	sub	cl, ah
  1938                              <1> ts:
  1939                              <1> 	; 02/09/2014
  1940                              <1> 	; 01/09/2014
  1941 00001D2A B020                <1> 	mov	al, 20h
  1942                              <1> tsloop:
  1943 00001D2C 6651                <1> 	push	cx
  1944 00001D2E 6650                <1> 	push	ax
  1945                              <1> 	;mov	bh, [ACTIVE_PAGE]
  1946 00001D30 E890FFFFFF          <1> 	call	_write_tty_m3 ; 24/06/2016 (m3 -> _write_tty_m3)
  1947 00001D35 6658                <1> 	pop	ax  ; ah = attribute/color
  1948 00001D37 6659                <1> 	pop	cx
  1949 00001D39 FEC9                <1> 	dec	cl
  1950 00001D3B 75EF                <1> 	jnz	short tsloop
  1951 00001D3D C3                  <1> 	retn
  1952                              <1> bs:	
  1953                              <1> 	; back space found
  1954                              <1> 
  1955 00001D3E 08D2                <1> 	or	dl, dl 		; is it already at start of line
  1956                              <1> 	;je	short u7 	; set_cursor
  1957 00001D40 7406                <1> 	jz	short _set_cpos
  1958 00001D42 664A                <1> 	dec	dx     		; no -- just move it back
  1959                              <1> 	;jmp	short u7
  1960 00001D44 EB02                <1> 	jmp	short _set_cpos
  1961                              <1> 
  1962                              <1> 	; carriage return found
  1963                              <1> u9:
  1964 00001D46 B200                <1> 	mov	dl, 0 		; move to first column
  1965                              <1> 	;jmp	short u7
  1966                              <1> 	;jmp	short _set_cpos ; 30/01/2016
  1967                              <1> 
  1968                              <1> 	; line feed found
  1969                              <1> ;u10:
  1970                              <1> ;	cmp	dh, 25-1 	; bottom of screen
  1971                              <1> ;	jne	short u6 	; no, just set the cursor
  1972                              <1> ;       jmp     u1              ; yes, scroll the screen
  1973                              <1> 
  1974                              <1> _set_cpos:
  1975                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  1976                              <1> 	; 27/06/2015
  1977                              <1> 	; 01/09/2014
  1978                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1979                              <1> 	;
  1980                              <1> 	; 04/12/2013 - 12/12/2013 (Retro UNIX 8086 v1) 
  1981                              <1> 	;
  1982                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1983                              <1> 	;
  1984                              <1> ;----------------------------------------------
  1985                              <1> ; SET_CPOS
  1986                              <1> ;	THIS ROUTINE SETS THE CURRENT CURSOR POSITION TO THE
  1987                              <1> ;	NEW X-Y VALUES PASSED
  1988                              <1> ; INPUT
  1989                              <1> ;	DX - ROW,COLUMN OF NEW CURSOR
  1990                              <1> ;	BH - DISPLAY PAGE OF CURSOR
  1991                              <1> ; OUTPUT
  1992                              <1> ;	CURSOR ID SET AT 6845 IF DISPLAY PAGE IS CURRENT DISPLAY
  1993                              <1> ;----------------------------------------------
  1994                              <1> 	;
  1995 00001D48 BE[FE410100]        <1> 	mov	esi, CURSOR_POSN
  1996 00001D4D 0FB6C7              <1>         movzx   eax, bh	; BH = video page number
  1997                              <1> ;	or	al, al
  1998                              <1> ;	jz	short _set_cpos_0
  1999 00001D50 D0E0                <1>         shl     al, 1   ; word offset
  2000 00001D52 01C6                <1>         add     esi, eax
  2001                              <1> ;_set_cpos_0:
  2002 00001D54 668916              <1> 	mov	[esi], dx ; save the pointer
  2003 00001D57 383D[0E420100]      <1> 	cmp	[ACTIVE_PAGE], bh
  2004 00001D5D 7532                <1> 	jne	short m17
  2005                              <1> 	;call	m18	; CURSOR SET
  2006                              <1> ;m17:			; SET_CPOS_RETURN
  2007                              <1> 	; 01/09/2014
  2008                              <1> ;	retn
  2009                              <1> 		; DX  = row/column
  2010                              <1> m18:
  2011 00001D5F E84CFCFFFF          <1> 	call	position ; determine location in regen buffer	
  2012 00001D64 668B0D[FC410100]    <1> 	mov	cx, [CRT_START]
  2013 00001D6B 6601C1              <1> 	add	cx, ax  ; add char position in regen buffer
  2014                              <1> 			; to the start address (offset) for this page
  2015 00001D6E 66D1E9              <1> 	shr	cx, 1	; divide by 2 for char only count
  2016 00001D71 B40E                <1> 	mov	ah, 14	; register number for cursor
  2017                              <1> 	;call	m16	; output value to the 6845	
  2018                              <1> 	;retn
  2019                              <1> 
  2020                              <1> 	;-----	THIS ROUTINE OUTPUTS THE CX REGISTER
  2021                              <1> 	;	TO THE 6845 REGISTERS NAMED IN (AH)
  2022                              <1> m16:
  2023 00001D73 FA                  <1> 	cli
  2024                              <1> 	;mov	dx, [addr_6845] ; address register
  2025 00001D74 66BAD403            <1> 	mov 	dx, 03D4h ; I/O address of color card
  2026 00001D78 88E0                <1> 	mov	al, ah	; get value
  2027 00001D7A EE                  <1> 	out	dx, al	; register set
  2028 00001D7B 6642                <1> 	inc	dx	; data register
  2029 00001D7D EB00                <1> 	jmp	$+2	; i/o delay
  2030 00001D7F 88E8                <1> 	mov	al, ch	; data
  2031 00001D81 EE                  <1> 	out	dx, al	
  2032 00001D82 664A                <1> 	dec	dx	
  2033 00001D84 88E0                <1> 	mov	al, ah
  2034 00001D86 FEC0                <1> 	inc	al	; point to other data register
  2035 00001D88 EE                  <1> 	out	dx, al	; set for second register
  2036 00001D89 6642                <1> 	inc	dx
  2037 00001D8B EB00                <1> 	jmp	$+2	; i/o delay
  2038 00001D8D 88C8                <1> 	mov	al, cl	; second data value
  2039 00001D8F EE                  <1> 	out	dx, al
  2040 00001D90 FB                  <1> 	sti
  2041                              <1> m17:
  2042 00001D91 C3                  <1> 	retn
  2043                              <1> 
  2044                              <1> beeper: 
  2045                              <1> 	; 04/08/2016
  2046                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  2047                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2048                              <1> 	; 18/01/2014
  2049                              <1> 	; 03/12/2013
  2050                              <1> 	; bell found
  2051                              <1> u11:
  2052 00001D92 FB                  <1> 	sti
  2053 00001D93 3A3D[0E420100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  2054 00001D99 7551                <1> 	jne	short u12	; Do not sound the beep 
  2055                              <1> 				; if it is not written on the active page
  2056                              <1> beeper_gfx: ; 04/08/2016
  2057 00001D9B 66B93305            <1> 	mov	cx, 1331 	; divisor for 896 hz tone
  2058 00001D9F B31F                <1> 	mov	bl, 31		; set count for 31/64 second for beep
  2059                              <1> 	;call	beep		; sound the pod bell
  2060                              <1> 	;jmp	short u5 	; tty_return
  2061                              <1> 	;retn
  2062                              <1> 	
  2063                              <1> TIMER	equ 	040h   		; 8254 TIMER - BASE ADDRESS
  2064                              <1> PORT_B	equ	061h		; PORT B READ/WRITE DIAGNOSTIC REGISTER
  2065                              <1> GATE2	equ	00000001b	; TIMER 2 INPUT CATE CLOCK BIT
  2066                              <1> SPK2	equ	00000010b	; SPEAKER OUTPUT DATA ENABLE BIT
  2067                              <1> 
  2068                              <1> beep:
  2069                              <1> 	; 07/02/2015
  2070                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2071                              <1> 	; 18/01/2014
  2072                              <1> 	; 03/12/2013
  2073                              <1> 	;
  2074                              <1> 	; TEST4.ASM - 06/10/85  POST AND BIOS UTILITY ROUTINES
  2075                              <1> 	;
  2076                              <1> 	; ROUTINE TO SOUND THE BEEPER USING TIMER 2 FOR TONE
  2077                              <1> 	;
  2078                              <1> 	; ENTRY:
  2079                              <1> 	;    (BL) = DURATION COUNTER ( 1 FOR 1/64 SECOND )
  2080                              <1> 	;    (CX) = FREQUENCY DIVISOR (1193180/FREQUENCY) (1331 FOR 886 HZ)
  2081                              <1> 	; EXIT:				:
  2082                              <1> 	;    (AX),(BL),(CX) MODIFIED.
  2083                              <1> 
  2084 00001DA1 9C                  <1> 	pushf  ; 18/01/2014	; save interrupt status
  2085 00001DA2 FA                  <1> 	cli			; block interrupts during update
  2086 00001DA3 B0B6                <1> 	mov	al, 10110110b	; select timer 2, lsb, msb binary
  2087 00001DA5 E643                <1> 	out	TIMER+3, al 	; write timer mode register
  2088 00001DA7 EB00                <1> 	jmp	$+2		; I/O delay
  2089 00001DA9 88C8                <1> 	mov	al, cl		; divisor for hz (low)
  2090 00001DAB E642                <1> 	out	TIMER+2,AL	; write timer 2 count - lsb
  2091 00001DAD EB00                <1> 	jmp	$+2		; I/O delay
  2092 00001DAF 88E8                <1> 	mov	al, ch		; divisor for hz (high)
  2093 00001DB1 E642                <1> 	out	TIMER+2, al	; write timer 2 count - msb
  2094 00001DB3 E461                <1> 	in	al, PORT_B	; get current setting of port
  2095 00001DB5 88C4                <1> 	mov	ah, al		; save that setting
  2096 00001DB7 0C03                <1> 	or	al, GATE2+SPK2	; gate timer 2 and turn speaker on
  2097 00001DB9 E661                <1> 	out	PORT_B, al	; and restore interrupt status
  2098                              <1> 	;popf	; 18/01/2014
  2099 00001DBB FB                  <1> 	sti
  2100                              <1> g7:				; 1/64 second per count (bl)
  2101 00001DBC B90B040000          <1> 	mov	ecx, 1035	; delay count for 1/64 of a second	
  2102 00001DC1 E827000000          <1> 	call	waitf		; go to beep delay 1/64 count
  2103 00001DC6 FECB                <1> 	dec	bl		; (bl) length count expired?
  2104 00001DC8 75F2                <1> 	jnz	short g7	; no - continue beeping speaker
  2105                              <1> 	;
  2106                              <1> 	;pushf			; save interrupt status
  2107 00001DCA FA                  <1> 	cli  	; 18/01/2014	; block interrupts during update
  2108 00001DCB E461                <1> 	in	al, PORT_B	; get current port value
  2109                              <1>         ;or      al, not (GATE2+SPK2) ; isolate current speaker bits in case
  2110 00001DCD 0CFC                <1>         or      al, ~(GATE2+SPK2)
  2111 00001DCF 20C4                <1>         and	ah, al		; someone turned them off during beep
  2112 00001DD1 88E0                <1> 	mov	al, ah		; recover value of port
  2113                              <1>         ;or      al, not (GATE2+SPK2) ; force speaker data off
  2114 00001DD3 0CFC                <1> 	or 	al, ~(GATE2+SPK2) ; isolate current speaker bits in case
  2115 00001DD5 E661                <1> 	out	PORT_B, al	; and stop speaker timer
  2116                              <1> 	;popf			; restore interrupt flag state
  2117 00001DD7 FB                  <1> 	sti
  2118 00001DD8 B90B040000          <1> 	mov	ecx, 1035	; force 1/64 second delay (short)
  2119 00001DDD E80B000000          <1> 	call	waitf		; minimum delay between all beeps
  2120                              <1> 	;pushf			; save interrupt status
  2121 00001DE2 FA                  <1> 	cli			; block interrupts during update
  2122 00001DE3 E461                <1> 	in	al, PORT_B	; get current port value in case	
  2123 00001DE5 2403                <1> 	and	al, GATE2+SPK2	; someone turned them on
  2124 00001DE7 08E0                <1> 	or	al, ah		; recover value of port_b
  2125 00001DE9 E661                <1> 	out	PORT_B, al	; restore speaker status
  2126 00001DEB 9D                  <1> 	popf			; restore interrupt flag state
  2127                              <1> u12:	
  2128 00001DEC C3                  <1> 	retn
  2129                              <1> 
  2130                              <1> REFRESH_BIT equ	00010000b 	; REFRESH TEST BIT
  2131                              <1> 
  2132                              <1> WAITF:
  2133                              <1> waitf:
  2134                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2135                              <1> 	; 03/12/2013
  2136                              <1> 	;
  2137                              <1> ;	push ax			; save work register (ah)	
  2138                              <1> ;waitf1:
  2139                              <1> 				; use timer 1 output bits
  2140                              <1> ;	in	al, PORT_B	; read current counter output status
  2141                              <1> ;	and	al, REFRESH_BIT	; mask for refresh determine bit
  2142                              <1> ;	cmp	al, ah		; did it just change
  2143                              <1> ;	je	short waitf1	; wait for a change in output line
  2144                              <1> ;	;
  2145                              <1> ;	mov	ah, al		; save new lflag state
  2146                              <1> ;	loop	waitf1		; decrement half cycles till count end		
  2147                              <1> ;	;
  2148                              <1> ;	pop	ax		; restore (ah)
  2149                              <1> ;	retn			; return (cx)=0
  2150                              <1> 
  2151                              <1> ; 06/02/2015 (unix386.s <-- dsectrm2.s)
  2152                              <1> ; 17/12/2014 (dsectrm2.s)
  2153                              <1> ; WAITF
  2154                              <1> ; /// IBM PC-XT Model 286 System BIOS Source Code - Test 4 - 06/10/85 ///
  2155                              <1> ;
  2156                              <1> ;---WAITF-----------------------------------------------------------------------
  2157                              <1> ;	FIXED TIME WAIT ROUTINE (HARDWARE CONTROLLED - NOT PROCESSOR)
  2158                              <1> ; ENTRY:
  2159                              <1> ;	(CX) =	COUNT OF 15.085737 MICROSECOND INTERVALS TO WAIT
  2160                              <1> ;	      	MEMORY REFRESH TIMER 1 OUTPUT USED AS REFERENCE
  2161                              <1> ; EXIT:
  2162                              <1> ;	       	AFTER (CX) TIME COUNT (PLUS OR MINUS 16 MICROSECONDS)
  2163                              <1> ;	(CX) = 0	
  2164                              <1> ;-------------------------------------------------------------------------------
  2165                              <1> 
  2166                              <1> ; Refresh period: 30 micro seconds (15-80 us)
  2167                              <1> ; (16/12/2014 - AWARDBIOS 1999 - ATORGS.ASM, WAIT_REFRESH)
  2168                              <1> 
  2169                              <1> ;WAITF:					; DELAY FOR (CX)*15.085737 US
  2170 00001DED 6650                <1> 	PUSH	AX			; SAVE WORK REGISTER (AH)
  2171                              <1> 	; 16/12/2014
  2172                              <1> 	;shr	cx, 1			; convert to count of 30 micro seconds
  2173 00001DEF D1E9                <1> 	shr	ecx, 1	; 21/02/2015
  2174                              <1> ;17/12/2014	
  2175                              <1> ;WAITF1:
  2176                              <1> ;	IN	AL, PORT_B   ;061h	; READ CURRENT COUNTER OUTPUT STATUS
  2177                              <1> ;	AND	AL, REFRESH_BIT	;00010000b ; MASK FOR REFRESH DETERMINE BIT
  2178                              <1> ;	CMP	AL, AH			; DID IT JUST CHANGE
  2179                              <1> ;	JE	short WAITF1		; WAIT FOR A CHANGE IN OUTPUT LINE
  2180                              <1> ;	MOV	AH, AL			; SAVE NEW FLAG STATE
  2181                              <1> ;	LOOP	WAITF1			; DECREMENT HALF CYCLES TILL COUNT END		
  2182                              <1> 	;
  2183                              <1> 	; 17/12/2014
  2184                              <1> 	;
  2185                              <1> 	; Modification from 'WAIT_REFRESH' procedure of AWARD BIOS - 1999
  2186                              <1> 	;
  2187                              <1> ;WAIT_REFRESH:  Uses port 61, bit 4 to have CPU speed independent waiting.
  2188                              <1> ;   	INPUT:  CX = number of refresh periods to wait
  2189                              <1> ;     	       (refresh periods = 1 per 30 microseconds on most machines)
  2190                              <1> WR_STATE_0:
  2191 00001DF1 E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  2192 00001DF3 A810                <1> 	TEST	AL,010H
  2193 00001DF5 74FA                <1> 	JZ	SHORT WR_STATE_0
  2194                              <1> WR_STATE_1:
  2195 00001DF7 E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  2196 00001DF9 A810                <1> 	TEST	AL,010H
  2197 00001DFB 75FA                <1> 	JNZ	SHORT WR_STATE_1
  2198 00001DFD E2F2                <1>         LOOP    WR_STATE_0
  2199                              <1> 	;
  2200 00001DFF 6658                <1> 	POP	AX			; RESTORE (AH)
  2201 00001E01 C3                  <1> 	RETn				; (CX) = 0
  2202                              <1> 
  2203                              <1> ; 09/07/2016
  2204                              <1> ; 01/07/2016
  2205                              <1> ; 24/06/2016
  2206                              <1> ; 23/06/2016 - TRDOS 386 (TRDOS v2.0)
  2207                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  2208                              <1> ;-------------------------------------------------------------------------------
  2209                              <1> ; WRITE_STRING								       :
  2210                              <1> ;	THIS ROUTINE WRITES A STRING OF CHARACTERS TO THE CRT.		       :
  2211                              <1> ; INPUT 								       :
  2212                              <1> ;	(AL) = WRITE STRING COMMAND  0 - 3				       :
  2213                              <1> ;	(BH) = DISPLAY PAGE (ACTIVE PAGE)				       :
  2214                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE, IF (CX) = 0 THEN RETURN	       :
  2215                              <1> ;	(DX) = CURSOR POSITION FOR START OF STRING WRITE		       :
  2216                              <1> ;	(BL) = ATTRIBUTE OF CHARACTER TO WRITE IF (AL) = 0  OR	(AL) = 1       :
  2217                              <1> ;	(eBP) = SOURCE STRING OFFSET					       :
  2218                              <1> ; OUTPUT								       :
  2219                              <1> ;	NONE								       :
  2220                              <1> ;-------------------------------------------------------------------------------
  2221                              <1> 
  2222                              <1> ; AL = 00h: Assign all characters the attribute in BL; do not update cursor
  2223                              <1> ; AL = 01h: Assign all characters the attribute in BL; update cursor
  2224                              <1> ; AL = 02h: Use attributes in string; do not update cursor
  2225                              <1> ; AL = 03h: Use attributes in string; update cursor
  2226                              <1> 
  2227                              <1> WRITE_STRING:
  2228                              <1> 	; 12/09/2016
  2229                              <1> 	; 09/07/2016
  2230                              <1> 	;cmp	byte [CRT_MODE], 7 ; 6?!
  2231                              <1> 	;ja	VIDEO_RETURN		; not a valid function for VGA modes
  2232                              <1> 	;
  2233 00001E02 A2[784F0100]        <1> 	mov	[w_str_cmd], al		; save (AL) command
  2234 00001E07 3C04                <1> 	CMP	AL, 4			; TEST FOR INVALID WRITE STRING OPTION
  2235 00001E09 0F8345F7FFFF        <1> 	JNB	VIDEO_RETURN		; IF OPTION INVALID THEN RETURN
  2236                              <1> 
  2237                              <1>         ;JCXZ   VIDEO_RETURN            ; IF ZERO LENGTH STRING THEN RETURN
  2238                              <1> 
  2239 00001E0F 67E35E              <1>         jcxz    P55			; 01/07/2016
  2240                              <1> 
  2241                              <1> 
  2242                              <1> 	; 01/07/2016
  2243                              <1> 	;and	ecx, 0FFFFh
  2244                              <1> 	; ECX = byte count
  2245                              <1> 	;push	ecx
  2246 00001E12 89EE                <1> 	mov	esi, ebp ; user buffer
  2247 00001E14 BF00000700          <1> 	mov	edi, Cluster_Buffer  ; system buffer
  2248 00001E19 E8F8C90000          <1> 	call	transfer_from_user_buffer
  2249                              <1> 	;pop	ecx
  2250 00001E1E 0F8230F7FFFF        <1> 	jc	VIDEO_RETURN
  2251                              <1> 	; ecx = transfer (byte) count = character count
  2252 00001E24 BD00000700          <1> 	mov	ebp, Cluster_Buffer
  2253                              <1> 	; 12/09/2016
  2254 00001E29 803D[225E0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6?!
  2255 00001E30 0F879F000000        <1> 	ja	vga_write_string
  2256                              <1> 	;
  2257 00001E36 0FB6F7              <1> 	movzx	esi, bh			; GET CURRENT CURSOR PAGE
  2258 00001E39 66D1E6              <1> 	SAL	SI,1			; CONVERT TO PAGE OFFSET  (SI= PAGE)
  2259                              <1> 	; *****
  2260 00001E3C 66FFB6[FE410100]    <1> 	PUSH	word [eSI+CURSOR_POSN]	; SAVE CURRENT CURSOR POSITION IN STACK
  2261                              <1> 
  2262                              <1> 	;MOV	AX,0200H		; SET NEW CURSOR POSITION
  2263                              <1> 	;INT	10H
  2264                              <1> P50next:	
  2265 00001E43 53                  <1> 	push	ebx ; ****
  2266 00001E44 51                  <1> 	push	ecx ; ***
  2267 00001E45 56                  <1> 	push	esi ; **
  2268 00001E46 52                  <1> 	push	edx ; *
  2269 00001E47 E8FCFEFFFF          <1> 	call	_set_cpos
  2270                              <1> P50:
  2271 00001E4C 8A4500              <1> 	MOV	AL, [eBP]		; GET CHARACTER FROM INPUT STRING
  2272 00001E4F 45                  <1> 	INC	eBP			; BUMP POINTER TO CHARACTER
  2273                              <1> 
  2274                              <1> ;-----	TEST FOR SPECIAL CHARACTER'S
  2275                              <1> 
  2276 00001E50 3C08                <1> 	CMP	AL, 08H			; IS IT A BACKSPACE
  2277 00001E52 740C                <1> 	JE	short P51		; BACK_SPACE
  2278 00001E54 3C0D                <1> 	CMP	AL, 0Dh ; CR		; IS IT CARRIAGE RETURN
  2279 00001E56 7408                <1> 	JE	short P51		; CAR_RET
  2280 00001E58 3C0A                <1> 	CMP	AL, 0Ah ; LF		; IS IT A LINE FEED
  2281 00001E5A 7404                <1> 	JE	short P51		; LINE_FEED
  2282 00001E5C 3C07                <1> 	CMP	AL, 07h			; IS IT A BELL
  2283 00001E5E 7515                <1> 	JNE	short P52		; IF NOT THEN DO WRITE CHARACTER
  2284                              <1> P51:
  2285                              <1> 	;MOV	AH,0EH			; TTY_CHARACTER_WRITE
  2286                              <1> 	;INT	10H			; WRITE TTY CHARACTER TO THE CRT
  2287                              <1> 	
  2288 00001E60 E860FEFFFF          <1> 	call	_write_tty_m3
  2289                              <1> 
  2290 00001E65 5A                  <1> 	pop	edx ; *
  2291 00001E66 5E                  <1> 	pop	esi ; **
  2292                              <1> 
  2293 00001E67 668B96[FE410100]    <1> 	MOV	DX, [eSI+CURSOR_POSN]	; GET CURRENT CURSOR POSITION
  2294 00001E6E EB46                <1> 	JMP	SHORT P54		; SET CURSOR POSITION AND CONTINUE
  2295                              <1> P55:
  2296 00001E70 E9DFF6FFFF          <1> 	JMP	VIDEO_RETURN
  2297                              <1> P52:
  2298 00001E75 66B90100            <1> 	MOV	CX, 1			; SET CHARACTER WRITE AMOUNT TO ONE
  2299 00001E79 803D[784F0100]02    <1> 	CMP	byte [w_str_cmd], 2	; IS THE ATTRIBUTE IN THE STRING
  2300 00001E80 7204                <1> 	JB	short P53		; IF NOT THEN SKIP
  2301 00001E82 8A5D00              <1> 	MOV	BL, [eBP]		; ELSE GET NEW ATTRIBUTE
  2302 00001E85 45                  <1> 	INC	eBP			; BUMP STRING POINTER
  2303                              <1> P53:
  2304                              <1> 	;MOV	AH,09H			; GOT_CHARACTER
  2305                              <1> 	;INT	10H			; WRITE CHARACTER TO THE CRT
  2306                              <1> 
  2307 00001E86 E8AEFDFFFF          <1> 	call	_write_c_current
  2308                              <1> 	
  2309 00001E8B 5A                  <1> 	pop	edx ; *	
  2310                              <1> 	
  2311 00001E8C 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  2312 00001E8F 889E[2B5E0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  2313                              <1> 
  2314 00001E95 FEC2                <1> 	INC	DL			; INCREMENT COLUMN COUNTER
  2315 00001E97 3A15[245E0000]      <1> 	CMP	DL, [CRT_COLS]		; IF COLS ARE WITHIN RANGE FOR THIS MODE
  2316 00001E9D 7217                <1> 	JB	short P54		;    THEN GO TO COLUMNS SET
  2317 00001E9F FEC6                <1> 	INC	DH			; BUMP ROW COUNTER BY ONE
  2318 00001EA1 28D2                <1> 	SUB	DL, DL			; SET COLUMN COUNTER TO ZERO
  2319 00001EA3 80FE19              <1> 	CMP	DH, 25			; IF ROWS ARE LESS THAN 25 THEN
  2320 00001EA6 720E                <1> 	JB	short P54		; GO TO ROWS_COLUMNS_SET
  2321                              <1> 
  2322 00001EA8 66B80A0E            <1> 	MOV	AX,0E0AH		; ELSE SCROLL SCREEN
  2323                              <1> 	;INT	10H			; RESET ROW COUNTER TO 24
  2324                              <1> 
  2325 00001EAC E814FEFFFF          <1> 	call	_write_tty_m3
  2326                              <1> 	
  2327 00001EB1 66BA0018            <1> 	mov	dx, 1800h		; Column = 0, Row = 24
  2328 00001EB5 5E                  <1> 	pop	esi ; **
  2329                              <1> P54:
  2330                              <1> 					; ROW_COLUMNS_SET
  2331                              <1> 	;MOV	AX,0200H		; SET NEW CURSOR POSITION COMMAND
  2332                              <1> 	;INT	10H			; ESTABLISH NEW CURSOR POSITION
  2333                              <1> 
  2334 00001EB6 59                  <1> 	pop	ecx ; ***
  2335 00001EB7 5B                  <1> 	pop	ebx ; ****
  2336                              <1> 
  2337                              <1> 	;LOOP	P50			; DO IT ONCE MORE UNTIL (CX) = ZERO
  2338 00001EB8 6649                <1> 	dec	cx
  2339 00001EBA 7587                <1> 	jnz	short P50next
  2340                              <1> 
  2341 00001EBC 665A                <1> 	POP	DX  ; *****		; RESTORE OLD CURSOR COORDINATES
  2342                              <1> 	
  2343 00001EBE F605[784F0100]01    <1> 	test	byte [w_str_cmd], 1	; IF CURSOR WAS NOT TO BE MOVED
  2344 00001EC5 0F8589F6FFFF        <1> 	JNZ	VIDEO_RETURN		; THEN EXIT WITHOUT RESETTING OLD VALUE
  2345                              <1> 	
  2346                              <1> 	;MOV	AX,0200H		; ELSE RESTORE OLD CURSOR POSITION
  2347                              <1> 	;INT	10H
  2348                              <1> 					; DONE - EXIT WRITE STRING
  2349 00001ECB E878FEFFFF          <1> 	call	_set_cpos
  2350 00001ED0 E97FF6FFFF          <1> 	JMP	VIDEO_RETURN		; RETURN TO CALLER
  2351                              <1> 
  2352                              <1> vga_write_string:
  2353                              <1> 	; 12/09/2016 - TRDOS 386 (TRDOS v2.0)
  2354                              <1> 	;
  2355                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2356                              <1> 	; vgabios-0.7a (2011)
  2357                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2358                              <1> 	; 'vgabios.c', ' biosfn_write_string'
  2359                              <1> 
  2360                              <1> 	; INPUT 								  :
  2361                              <1> 	;	(AL) = WRITE STRING COMMAND  0 - 3				  :
  2362                              <1> 	;	(BH) = DISPLAY PAGE (ACTIVE PAGE)				  :
  2363                              <1> 	;	(CX) = COUNT OF CHARACTERS TO WRITE, IF (CX) = 0 THEN RETURN	  :
  2364                              <1> 	;	(DX) = CURSOR POSITION FOR START OF STRING WRITE		  :
  2365                              <1> 	;	(BL) = ATTRIBUTE OF CHARACTER TO WRITE IF (AL) = 0  OR	(AL) = 1  :
  2366                              <1> 	;	(eBP) = SOURCE STRING OFFSET					  :
  2367                              <1> 	; OUTPUT								  :
  2368                              <1> 	;	NONE								  :
  2369                              <1> 	;-------------------------------------------------------------------------;
  2370                              <1> 
  2371                              <1> 	; AL = 00h: Assign all characters the attribute in BL; do not update cursor
  2372                              <1> 	; AL = 01h: Assign all characters the attribute in BL; update cursor
  2373                              <1> 	; AL = 02h: Use attributes in string; do not update cursor
  2374                              <1> 	; AL = 03h: Use attributes in string; update cursor
  2375                              <1> 	
  2376                              <1> 	; biosfn_write_string(GET_AL(),GET_BH(),GET_BL(),CX,GET_DH(),GET_DL(),ES,BP);
  2377                              <1> 	; static void biosfn_write_string (flag,page,attr,count,row,col,seg,offset) 
  2378                              <1> 
  2379                              <1> 	; // Read curs info for the page
  2380                              <1>  	; biosfn_get_cursor_pos(page,&dummy,&oldcurs);
  2381                              <1> 	; bh = video page = 0
  2382                              <1> 	;movzx	esi, word [CURSOR_POSN] ; current cursor position for video page 0
  2383                              <1> 	
  2384                              <1> 	; // if row=0xff special case : use current cursor position
  2385                              <1> 	; if(row==0xff)
  2386                              <1> 	;  {col=oldcurs&0x00ff;
  2387                              <1> 	;   row=(oldcurs&0xff00)>>8;
  2388                              <1> 	;  }
  2389                              <1> 
  2390                              <1> 	;mov	al, [w_str_cmd]
  2391                              <1> 
  2392 00001ED5 80FEFF              <1> 	cmp	dh, 0FFh
  2393 00001ED8 7407                <1> 	je	short vga_wstr_1 ; user current cursor position
  2394                              <1> vga_wstr_0:
  2395                              <1> 	; set cursor position
  2396 00001EDA 668915[FE410100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  2397                              <1> vga_wstr_1:
  2398 00001EE1 66FF35[FE410100]    <1> 	push	word [CURSOR_POSN] ; *
  2399                              <1> 
  2400                              <1> 	; ebp = string offset in system buffer (user buffer was copied to)	
  2401                              <1> 	
  2402                              <1> 	; while(count--!=0)
  2403                              <1> 	;  {
  2404                              <1> 	;   car=read_byte(seg,offset++);
  2405                              <1> 	;   if((flag&0x02)!=0)
  2406                              <1> 	;    attr=read_byte(seg,offset++);
  2407                              <1> 	;    biosfn_write_teletype(car,page,attr,WITH_ATTR);
  2408                              <1> 	;  }
  2409                              <1> 
  2410                              <1> 	;push	eax ; **
  2411                              <1> 	;test	al, 2
  2412 00001EE8 F605[784F0100]02    <1> 	test	byte [w_str_cmd], 2
  2413 00001EEF 751D                <1> 	jnz	short vga_wstr_3
  2414 00001EF1 881D[0F420100]      <1> 	mov	[ccolor], bl
  2415                              <1> vga_wstr_2:
  2416 00001EF7 51                  <1> 	push	ecx
  2417 00001EF8 8A4500              <1> 	mov	al, [ebp]
  2418 00001EFB E8CC0A0000          <1> 	call	vga_write_teletype
  2419 00001F00 59                  <1> 	pop	ecx
  2420 00001F01 6649                <1> 	dec	cx
  2421 00001F03 741E                <1> 	jz	short vga_wstr_4
  2422 00001F05 45                  <1> 	inc	ebp
  2423 00001F06 8A1D[0F420100]      <1> 	mov	bl, [ccolor]
  2424 00001F0C EBE9                <1> 	jmp	short vga_wstr_2
  2425                              <1> vga_wstr_3:
  2426 00001F0E 51                  <1> 	push	ecx
  2427 00001F0F 8A4500              <1> 	mov	al, [ebp]
  2428 00001F12 45                  <1> 	inc	ebp
  2429 00001F13 8A5D00              <1> 	mov	bl, [ebp]
  2430 00001F16 E8B10A0000          <1> 	call	vga_write_teletype
  2431 00001F1B 59                  <1> 	pop	ecx
  2432 00001F1C 6649                <1> 	dec	cx
  2433 00001F1E 7403                <1> 	jz	short vga_wstr_4
  2434 00001F20 45                  <1> 	inc	ebp
  2435 00001F21 EBEB                <1> 	jmp	short vga_wstr_3
  2436                              <1> vga_wstr_4:
  2437                              <1> 	; // Set back curs pos 
  2438                              <1> 	; if((flag&0x01)==0)
  2439                              <1> 	;  biosfn_set_cursor_pos(page,oldcurs);
  2440                              <1> 	; }
  2441                              <1> 	;pop	eax ; **
  2442 00001F23 665A                <1> 	pop	dx ; word [CURSOR_POSN] ; *
  2443                              <1> 	;test	al, 1
  2444 00001F25 F605[784F0100]01    <1> 	test	byte [w_str_cmd], 1
  2445 00001F2C 0F8522F6FFFF        <1> 	jnz	VIDEO_RETURN
  2446 00001F32 668915[FE410100]    <1> 	mov 	[CURSOR_POSN], dx
  2447 00001F39 E916F6FFFF          <1> 	JMP	VIDEO_RETURN
  2448                              <1> 
  2449                              <1> ; 07/07/2016
  2450                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  2451                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  2452                              <1> ;------------------------------------------------------
  2453                              <1> ;  SCROLL UP
  2454                              <1> ;   THIS ROUTINE SCROLLS UP THE INFORMATION ON THE CRT
  2455                              <1> ; ENTRY ---
  2456                              <1> ;  CH,CL = UPPER LEFT CORNER OF REGION TO SCROLL
  2457                              <1> ;  DH,DL = LOWER RIGHT CORNER OF REGION TO SCROLL
  2458                              <1> ;   BOTH OF THE ABOVE ARE IN CHARACTER POSITIONS
  2459                              <1> ;  BH = FILL VALUE FOR BLANKED LINES
  2460                              <1> ;  AL = # LINES TO SCROLL (AL=0 MEANS BLANK THE ENTIRE FIELD)
  2461                              <1> ;  DS = DATA SEGMENT
  2462                              <1> ;  ES = REGEN SEGMENT
  2463                              <1> ; EXIT --
  2464                              <1> ;  NOTHING, THE SCREEN IS SCROLLED
  2465                              <1> ;--------------------------------------------------------
  2466                              <1> 
  2467                              <1> 	; cl = upper left column
  2468                              <1> 	; ch = upper left row
  2469                              <1> 	; dl = lower rigth column
  2470                              <1> 	; dh = lower right row
  2471                              <1> 	;
  2472                              <1> 	; al = line count (AL=0 means blank entire fields)
  2473                              <1> 	; bl = fill value for blanked lines	
  2474                              <1> 	; bh = unused
  2475                              <1> 
  2476                              <1> GRAPHICS_UP:
  2477                              <1> 	; 07/07/2016
  2478                              <1> 	;AH = Current video mode, [CRT_MODE]
  2479 00001F3E 80FC07              <1> 	cmp	ah, 7
  2480 00001F41 7766                <1> 	ja	short vga_graphics_up
  2481                              <1> 	;je	n0
  2482                              <1> 
  2483 00001F43 88C7                <1> 	MOV	bh, al			; save line count in BH
  2484 00001F45 6689C8              <1> 	MOV	AX, CX			; GET UPPER LEFT POSITION INTO AX REG
  2485                              <1> 
  2486                              <1> ;-----	USE CHARACTER SUBROUTINE FOR POSITIONING
  2487                              <1> ;-----	ADDRESS RETURNED IS MULTIPLIED BY 2 FROM CORRECT VALUE
  2488                              <1> 
  2489 00001F48 E8D9050000          <1> 	CALL	GRAPH_POSN
  2490 00001F4D 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  2491                              <1> 
  2492                              <1> ;-----	DETERMINE SIZE OF WINDOW
  2493                              <1> 
  2494 00001F50 6629CA              <1> 	SUB	DX, CX
  2495 00001F53 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  2496 00001F58 C0E602              <1> 	SAL	DH, 2			; MULTIPLY ROWS BY 4 AT 8 VERT DOTS/CHAR
  2497                              <1> 					; AND EVEN/ODD ROWS
  2498                              <1> ;-----	DETERMINE CRT MODE
  2499                              <1> 
  2500 00001F5B 803D[225E0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  2501 00001F62 7305                <1>         JNC     short _R7_              ; FIND_SOURCE
  2502                              <1> 
  2503                              <1> ;-----	MEDIUM RES UP
  2504 00001F64 D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  2505 00001F66 66D1E7              <1> 	SAL	DI, 1			; OFFSET *2 SINCE 2 BYTES/CHAR
  2506                              <1> 
  2507                              <1> ;-----	DETERMINE THE SOURCE ADDRESS IN THE BUFFER
  2508                              <1> _R7_:                                   ; FIND_SOURCE
  2509 00001F69 81C700800B00        <1> 	add	edi, 0B8000h
  2510 00001F6F C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  2511 00001F72 7431                <1>         JZ      short _R11              ; IF ZERO, THEN BLANK ENTIRE FIELD
  2512 00001F74 B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  2513 00001F76 F6E7                <1> 	mul	bh			; determine offset to source
  2514 00001F78 0FB7F0              <1> 	movzx	esi, ax			; offset to source
  2515 00001F7B 01FE                <1> 	add	eSI, eDI		; SET UP SOURCE
  2516 00001F7D 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  2517 00001F7F 28FC                <1> 	sub	ah, bh			; determine number to move
  2518                              <1> 
  2519                              <1> ;-----	LOOP THROUGH, MOVING ONE ROW AT A TIME, BOTH EVEN AND ODD FIELDS
  2520                              <1> _R8:                                    ; ROW_LOOP
  2521 00001F81 E812040000          <1>         CALL    _R17                    ; MOVE ONE ROW
  2522 00001F86 6681EEB01F          <1> 	SUB	SI, 2000h-80		; MOVE TO NEXT ROW
  2523 00001F8B 6681EFB01F          <1> 	SUB	DI, 2000h-80
  2524 00001F90 FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  2525 00001F92 75ED                <1>         JNZ     short _R8               ; CONTINUE TILL ALL MOVED
  2526                              <1> 
  2527                              <1> ;-----	FILL IN THE VACATED LINE(S)
  2528                              <1> _R9:                                    ; CLEAR ENTRY
  2529 00001F94 88D8                <1> 	mov	al, bl			; attribute to fill with
  2530                              <1> _R10_:
  2531 00001F96 E819040000          <1>         CALL    _R18                    ; CLEAR THAT ROW
  2532 00001F9B 6681EFB01F          <1> 	SUB	DI, 2000h-80		; POINT TO NEXT LINE
  2533 00001FA0 FECF                <1> 	dec	bh			; number of lines to fill
  2534 00001FA2 75F2                <1>         JNZ     short _R10_             ; CLEAR LOOP
  2535 00001FA4 C3                  <1> 	retn				; EVERYYHING DONE
  2536                              <1> 
  2537                              <1> _R11:                                   ; BLANK_FIELD
  2538 00001FA5 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  2539 00001FA7 EBEB                <1>         JMP     short _R9               ; CLEAR THE FIELD
  2540                              <1> 
  2541                              <1> vga_graphics_up:
  2542                              <1> 	; 08/08/2016
  2543                              <1> 	; 07/08/2016
  2544                              <1> 	; 04/08/2016
  2545                              <1> 	; 01/08/2016
  2546                              <1> 	; 31/07/2016
  2547                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2548                              <1> 	;
  2549                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2550                              <1> 	; vgabios-0.7a (2011)
  2551                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2552                              <1> 	; 'vgabios.c', 'biosfn_scroll'
  2553                              <1> 	;
  2554                              <1> 
  2555                              <1> 	; cl = upper left column
  2556                              <1> 	; ch = upper left row
  2557                              <1> 	; dl = lower rigth column
  2558                              <1> 	; dh = lower right row
  2559                              <1> 	;
  2560                              <1> 	; al = line count (AL=0 means blank entire fields)
  2561                              <1> 	; bl = fill value for blanked lines	
  2562                              <1> 	; bh = unused
  2563                              <1> 	;
  2564                              <1> 	; ah = [CRT_MODE], current video mode	
  2565                              <1> 
  2566 00001FA9 88C7                <1> 	mov	bh, al ; 31/07/2016
  2567 00001FAB BE[465E0000]        <1> 	mov	esi, vga_g_modes
  2568 00001FB0 89F7                <1> 	mov	edi, esi
  2569 00001FB2 83C708              <1> 	add	edi, vga_g_mode_count
  2570                              <1> vga_g_up_0:
  2571 00001FB5 AC                  <1> 	lodsb
  2572 00001FB6 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  2573 00001FB8 7405                <1> 	je	short vga_g_up_1
  2574 00001FBA 39FE                <1> 	cmp	esi, edi
  2575 00001FBC 72F7                <1> 	jb	short vga_g_up_0
  2576                              <1> 	;xor	bh, bh ; 31/07/2016)
  2577 00001FBE C3                  <1> 	retn	; nothing to do
  2578                              <1> vga_g_up_1:
  2579 00001FBF 88F8                <1> 	mov	al, bh ; 31/07/2016
  2580 00001FC1 83C64F              <1> 	add	esi, vga_g_memmodel - (vga_g_modes + 1)  
  2581                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  2582                              <1> 	
  2583                              <1> 	; if(rlr>=nbrows)rlr=nbrows-1;
  2584                              <1>  	; if(clr>=nbcols)clr=nbcols-1;
  2585                              <1>  	; if(nblines>nbrows)nblines=0;
  2586                              <1>  	; cols=clr-cul+1;
  2587                              <1> 
  2588 00001FC4 3A35[2A5E0000]      <1> 	cmp	dh, [VGA_ROWS]
  2589 00001FCA 7208                <1> 	jb	short vga_g_up_2
  2590 00001FCC 8A35[2A5E0000]      <1> 	mov	dh, [VGA_ROWS]
  2591 00001FD2 FECE                <1> 	dec	dh
  2592                              <1> vga_g_up_2:
  2593 00001FD4 3A15[245E0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  2594 00001FDA 7208                <1> 	jb	short vga_g_up_3
  2595 00001FDC 8A15[245E0000]      <1> 	mov	dl, [CRT_COLS]
  2596 00001FE2 FECA                <1> 	dec	dl
  2597                              <1> vga_g_up_3:	
  2598 00001FE4 3A05[2A5E0000]      <1> 	cmp	al, [VGA_ROWS]
  2599 00001FEA 7602                <1> 	jna	short vga_g_up_4
  2600 00001FEC 28C0                <1> 	sub	al, al ; 0
  2601                              <1> vga_g_up_4:
  2602 00001FEE 88D7                <1> 	mov	bh, dl ; clr
  2603 00001FF0 28CF                <1> 	sub	bh, cl ; cul
  2604 00001FF2 FEC7                <1> 	inc	bh ; cols = clr-cul+1
  2605                              <1> 
  2606 00001FF4 20C0                <1> 	and	al, al ; nblines = 0
  2607 00001FF6 755D                <1> 	jnz	short vga_g_up_6
  2608 00001FF8 20ED                <1> 	and	ch, ch ; rul = 0
  2609 00001FFA 7559                <1> 	jnz	short vga_g_up_6
  2610 00001FFC 20C9                <1> 	and	cl, cl ; cul = 0
  2611 00001FFE 7555                <1> 	jnz	short vga_g_up_6
  2612                              <1> 
  2613 00002000 6650                <1> 	push	ax
  2614 00002002 A0[2A5E0000]        <1> 	mov	al, [VGA_ROWS]
  2615 00002007 FEC8                <1> 	dec	al  
  2616 00002009 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  2617 0000200B 7546                <1> 	jne	short vga_g_up_5
  2618 0000200D A0[245E0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  2619 00002012 FEC8                <1> 	dec	al 
  2620 00002014 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  2621 00002016 753B                <1> 	jne	short vga_g_up_5
  2622 00002018 6658                <1> 	pop	ax
  2623                              <1> 
  2624 0000201A 66B80502            <1> 	mov	ax, 0205h
  2625 0000201E 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2626 00002022 66EF                <1> 	out	dx, ax
  2627 00002024 A0[2A5E0000]        <1> 	mov	al, [VGA_ROWS]
  2628 00002029 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  2629 0000202F F6E4                <1> 	mul	ah
  2630 00002031 0FB7D0              <1> 	movzx	edx, ax
  2631                              <1> 	; 08/08/2016
  2632 00002034 0FB605[265E0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2633 0000203B F7E2                <1> 	mul	edx
  2634                              <1> 	; eax = byte count	
  2635 0000203D 89C1                <1> 	mov	ecx, eax
  2636                              <1> 	;; 07/08/2016
  2637                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  2638                              <1> 	;mov	ecx, edx
  2639 0000203F 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  2640 00002041 BF00000A00          <1> 	mov	edi, 0A0000h
  2641 00002046 F3AA                <1> 	rep	stosb		
  2642                              <1> 	
  2643 00002048 66B80500            <1> 	mov	ax, 5
  2644 0000204C 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2645 00002050 66EF                <1> 	out	dx, ax ; 0005h	
  2646                              <1> 
  2647 00002052 C3                  <1> 	retn
  2648                              <1> 
  2649                              <1> vga_g_up_5:
  2650 00002053 6658                <1> 	pop	ax
  2651                              <1> 
  2652                              <1> vga_g_up_6:
  2653                              <1> 	; [ESI] = VGA memory model number for current video mode
  2654                              <1>         ;
  2655                              <1>         ; LINEAR8 equ 5
  2656                              <1>         ; PLANAR4 equ 4
  2657                              <1>         ; PLANAR1 equ 3
  2658                              <1> 
  2659 00002055 803E04              <1> 	cmp	byte [esi], PLANAR4
  2660 00002058 7424                <1> 	je	short vga_g_up_planar
  2661 0000205A 803E03              <1> 	cmp	byte [esi], PLANAR1
  2662 0000205D 741F                <1> 	je	short vga_g_up_planar
  2663                              <1> vga_g_up_linear8:
  2664                              <1> 	; 07/07/2016 (TEMPORARY)
  2665                              <1> 	;
  2666                              <1> 	; cl = upper left column ; cul
  2667                              <1> 	; ch = upper left row ; rul
  2668                              <1> 	; dl = lower rigth column ; clr
  2669                              <1> 	; dh = lower right row ; rlr
  2670                              <1> 
  2671                              <1> vga_g_up_l0:
  2672                              <1>  	;{for(i=rul;i<=rlr;i++)
  2673                              <1>   	; if((i+nblines>rlr)||(nblines==0))
  2674 0000205F 08C0                <1> 	or	al, al
  2675 00002061 7414                <1> 	jz	short vga_g_up_l2
  2676 00002063 88C4                <1> 	mov	ah, al
  2677 00002065 00EC                <1> 	add	ah, ch ; i+nblines
  2678                              <1> 	;jc	short vga_g_up_l2	
  2679 00002067 38F4                <1> 	cmp	ah, dh
  2680 00002069 770C                <1> 	ja	short vga_g_up_l2
  2681                              <1> 	; else
  2682                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  2683 0000206B E8F2000000          <1> 	call	vgamem_copy_l8
  2684                              <1> vga_g_up_l1:
  2685 00002070 FEC5                <1> 	inc	ch
  2686 00002072 38F5                <1> 	cmp	ch, dh
  2687 00002074 76E9                <1> 	jna	short vga_g_up_l0
  2688 00002076 C3                  <1> 	retn
  2689                              <1> vga_g_up_l2:
  2690                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  2691 00002077 E850010000          <1> 	call	vgamem_fill_l8
  2692 0000207C EBF2                <1> 	jmp	short vga_g_up_l1
  2693                              <1> 
  2694                              <1> vga_g_up_planar:
  2695                              <1> 	; cl = upper left column ; cul
  2696                              <1> 	; ch = upper left row ; rul
  2697                              <1> 	; dl = lower rigth column ; clr
  2698                              <1> 	; dh = lower right row ; rlr
  2699                              <1> vga_g_up_pl0:
  2700                              <1>  	;{for(i=rul;i<=rlr;i++)
  2701                              <1>   	; if((i+nblines>rlr)||(nblines==0))
  2702 0000207E 20C0                <1> 	and	al, al
  2703 00002080 7414                <1> 	jz	short vga_g_up_pl2	
  2704 00002082 88C4                <1> 	mov	ah, al
  2705 00002084 00EC                <1> 	add	ah, ch ; i+nblines
  2706                              <1> 	;jc	short vga_g_up_pl2
  2707 00002086 38F4                <1> 	cmp	ah, dh
  2708 00002088 770C                <1> 	ja	short vga_g_up_pl2
  2709                              <1> 	; else
  2710                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  2711 0000208A E80E000000          <1> 	call	vgamem_copy_pl4
  2712                              <1> vga_g_up_pl1:
  2713 0000208F FEC5                <1> 	inc	ch 
  2714 00002091 38F5                <1> 	cmp	ch, dh
  2715 00002093 76E9                <1> 	jna	short vga_g_up_pl0
  2716 00002095 C3                  <1> 	retn
  2717                              <1> vga_g_up_pl2:
  2718                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  2719 00002096 E870000000          <1> 	call	vgamem_fill_pl4
  2720 0000209B EBF2                <1> 	jmp	short vga_g_up_pl1
  2721                              <1> 
  2722                              <1> vgamem_copy_pl4:
  2723                              <1> 	; 08/08/2016
  2724                              <1> 	; 07/08/2016
  2725                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2726                              <1> 	;
  2727                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2728                              <1> 	; vgabios-0.7a (2011)
  2729                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2730                              <1> 	; 'vgabios.c', 'vgamem_copy_pl4'
  2731                              <1> 	;
  2732                              <1> 	; vgamem_copy_pl4(xstart,ysrc,ydest,cols,nbcols,cheight)
  2733                              <1> 	; cl = xstart, ah = ysrc (i+nblines), ch = ydest (i),
  2734                              <1> 	; bh = cols, [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  2735                              <1> 
  2736                              <1> 	; src=ysrc*cheight*nbcols+xstart;
  2737                              <1> 	; dest=ydest*cheight*nbcols+xstart;
  2738                              <1> 
  2739 0000209D 52                  <1> 	push	edx
  2740 0000209E 50                  <1> 	push	eax
  2741                              <1> 
  2742                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0105)
  2743 0000209F 66B80501            <1> 	mov	ax, 0105h
  2744 000020A3 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2745 000020A7 66EF                <1> 	out	dx, ax
  2746                              <1> 
  2747                              <1> 	; 07/08/2016
  2748                              <1>  	;mov     ah, [esp+1]
  2749                              <1> 	;movzx	edx, ah ; ysrc
  2750 000020A9 0FB6542401          <1> 	movzx	edx, byte [esp+1]
  2751                              <1> 	; 08/08/2016
  2752 000020AE 0FB605[265E0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2753 000020B5 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  2754 000020BB F6E4                <1> 	mul	ah 
  2755                              <1> 	;; 07/08/2016
  2756                              <1> 	;movzx	eax, byte [CRT_COLS]
  2757                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  2758 000020BD 50                  <1> 	push	eax ; cheight * nbcols
  2759 000020BE F7E2                <1> 	mul	edx ; * ysrc
  2760                              <1> 	; eax = ysrc * cheight * nbcols
  2761                              <1> 	; edx = 0
  2762 000020C0 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2763 000020C2 01D0                <1>  	add	eax, edx
  2764 000020C4 89C6                <1> 	mov	esi, eax ; src
  2765 000020C6 88EA                <1> 	mov	dl, ch ; ydest
  2766 000020C8 58                  <1> 	pop	eax ; cheight * nbcols
  2767 000020C9 F7E2                <1> 	mul	edx
  2768                              <1> 	; eax = ydest * cheight * nbcols
  2769 000020CB 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2770 000020CD 01D0                <1>  	add	eax, edx
  2771 000020CF 89C7                <1> 	mov	edi, eax ; dest
  2772                              <1> 	; esi = src
  2773                              <1> 	; edi = dest
  2774                              <1> 	; for(i=0;i<cheight;i++)
  2775                              <1>   	; {
  2776                              <1>    	;  memcpyb(0xa000,dest+i*nbcols,0xa000,src+i*nbcols,cols);
  2777                              <1>   	; }
  2778 000020D1 51                  <1> 	push	ecx
  2779 000020D2 B900000A00          <1> 	mov	ecx, 0A0000h
  2780 000020D7 01CE                <1> 	add	esi, ecx
  2781 000020D9 01CF                <1> 	add	edi, ecx
  2782                              <1> 	; 08/08/2016
  2783 000020DB 8A35[265E0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2784                              <1> 	;; 07/08/2016
  2785                              <1> 	;mov	dh, 8 ; 07/08/2016
  2786 000020E1 28D2                <1> 	sub	dl, dl ; i
  2787                              <1> vgamem_copy_pl4_0:
  2788 000020E3 56                  <1> 	push	esi
  2789 000020E4 57                  <1> 	push	edi
  2790 000020E5 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2791 000020EC F6E2                <1> 	mul	dl
  2792                              <1> 	; eax = i * nbcols
  2793 000020EE 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2794 000020F0 01C6                <1> 	add	esi, eax
  2795 000020F2 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2796 000020F5 F3A4                <1> 	rep	movsb
  2797 000020F7 5F                  <1> 	pop	edi
  2798 000020F8 5E                  <1> 	pop	esi
  2799 000020F9 FECE                <1> 	dec	dh
  2800 000020FB 75E6                <1> 	jnz	short vgamem_copy_pl4_0
  2801                              <1> vgamem_copy_pl4_1:
  2802 000020FD 59                  <1> 	pop	ecx
  2803                              <1> 
  2804                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2805 000020FE 66B80500            <1> 	mov	ax, 0005h
  2806 00002102 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2807 00002106 66EF                <1> 	out	dx, ax
  2808                              <1> 
  2809 00002108 58                  <1> 	pop	eax
  2810 00002109 5A                  <1> 	pop	edx
  2811                              <1> 
  2812 0000210A C3                  <1> 	retn	
  2813                              <1> 
  2814                              <1> vgamem_fill_pl4:
  2815                              <1> 	; 08/08/2016
  2816                              <1> 	; 07/08/2016
  2817                              <1> 	; 04/08/2016
  2818                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2819                              <1> 	;
  2820                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2821                              <1> 	; vgabios-0.7a (2011)
  2822                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2823                              <1> 	; 'vgabios.c', 'vgamem_fill_pl4'
  2824                              <1> 	;
  2825                              <1> 	; vgamem_fill_pl4(xstart,ystart,cols,nbcols,cheight,attr)
  2826                              <1> 	; cl = xstart, edi = ch = ystart, bh = cols,
  2827                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight, attr = 0
  2828                              <1> 
  2829                              <1> 	; dest=ystart*cheight*nbcols+xstart;
  2830 0000210B 52                  <1> 	push	edx
  2831 0000210C 50                  <1> 	push	eax
  2832                              <1> 
  2833                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205)
  2834 0000210D 66B80502            <1> 	mov	ax, 0205h
  2835 00002111 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2836 00002115 66EF                <1> 	out	dx, ax
  2837                              <1> 
  2838                              <1>       	; 08/08/2016
  2839 00002117 0FB605[265E0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  2840 0000211E F6E5                <1> 	mul	ch
  2841                              <1> 	;; 07/08/2016
  2842                              <1> 	;movzx	eax, ch
  2843                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  2844 00002120 0FB615[245E0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  2845 00002127 F7E2                <1> 	mul	edx
  2846                              <1> 	; edx  = 0
  2847 00002129 88CA                <1> 	mov	dl, cl 
  2848 0000212B 01D0                <1> 	add	eax, edx
  2849 0000212D 89C7                <1> 	mov	edi, eax
  2850                              <1> 	; edi = dest
  2851                              <1> 	; for(i=0;i<cheight;i++)
  2852                              <1>   	; {
  2853                              <1>    	;  memsetb(0xa000,dest+i*nbcols,attr,cols);
  2854                              <1>   	; }
  2855 0000212F 81C700000A00        <1> 	add	edi, 0A0000h
  2856 00002135 51                  <1> 	push	ecx
  2857                              <1> 	; 08/08/2016
  2858 00002136 8A35[265E0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2859                              <1> 	;; 07/08/2016
  2860                              <1> 	;mov	dh, 8 ; 07/08/2016
  2861 0000213C 28D2                <1> 	sub	dl, dl ; i
  2862                              <1> vgamem_fill_pl4_0:
  2863 0000213E 57                  <1> 	push	edi
  2864 0000213F 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2865 00002146 F6E2                <1> 	mul	dl
  2866                              <1> 	; eax = i * nbcols
  2867 00002148 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2868 0000214A 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  2869 0000214C 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2870 0000214F F3AA                <1>  	rep	stosb
  2871 00002151 5F                  <1> 	pop	edi
  2872 00002152 75EA                <1> 	jnz	short vgamem_fill_pl4_0
  2873                              <1> vgamem_fill_pl4_1:
  2874 00002154 59                  <1> 	pop	ecx
  2875                              <1> 
  2876                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2877 00002155 66B80500            <1> 	mov	ax, 0005h
  2878 00002159 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2879 0000215D 66EF                <1> 	out	dx, ax
  2880                              <1> 
  2881 0000215F 58                  <1> 	pop	eax
  2882 00002160 5A                  <1> 	pop	edx 
  2883                              <1> 	
  2884 00002161 C3                  <1> 	retn
  2885                              <1> 
  2886                              <1> vgamem_copy_l8:
  2887                              <1> 	; 08/08/2016
  2888                              <1> 	; 07/08/2016
  2889                              <1> 	; 06/08/2016
  2890                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2891                              <1> 	;
  2892                              <1> 	; TEMPORARY
  2893                              <1> 	;
  2894                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2895                              <1> 	; vgabios-0.7a (2011)
  2896                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2897                              <1> 	; 'vgabios.c', 'vgamem_copy_pl4'
  2898                              <1> 	;
  2899                              <1> 	; vgamem_copy_pl4(xstart,ysrc,ydest,cols,nbcols,cheight)
  2900                              <1> 	; cl = xstart, ah = ysrc (i+nblines), ch = ydest (i),
  2901                              <1> 	; bh = cols, [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  2902                              <1> 
  2903                              <1> 	; src=ysrc*cheight*nbcols+xstart;
  2904                              <1> 	; dest=ydest*cheight*nbcols+xstart;
  2905                              <1> 
  2906 00002162 52                  <1> 	push	edx
  2907 00002163 50                  <1> 	push	eax
  2908                              <1> 
  2909                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0105)
  2910                              <1> 	;mov	ax, 0105h
  2911                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2912                              <1> 	;out	dx, ax
  2913                              <1> 
  2914                              <1> 	;mov	ah, [esp+1]
  2915                              <1> 
  2916 00002164 0FB6D4              <1> 	movzx	edx, ah ; ysrc
  2917                              <1> 	; 08/08/2016
  2918 00002167 0FB605[265E0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2919 0000216E 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  2920 00002174 F6E4                <1> 	mul	ah 
  2921                              <1> 	;; 07/08/2016
  2922                              <1> 	;movzx	eax, byte [CRT_COLS]
  2923                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  2924 00002176 50                  <1> 	push	eax ; cheight * nbcols
  2925 00002177 F7E2                <1> 	mul	edx ; * ysrc
  2926                              <1> 	; eax = ysrc * cheight * nbcols
  2927                              <1> 	; edx = 0
  2928 00002179 88CA                <1> 	mov	dl, cl ; edx = xstart
  2929 0000217B 01D0                <1>  	add	eax, edx
  2930 0000217D 89C6                <1> 	mov	esi, eax ; src
  2931 0000217F 66C1E603            <1> 	shl	si, 3 ; * 8 ; 06/08/2016
  2932 00002183 88EA                <1> 	mov	dl, ch ; ydest
  2933 00002185 58                  <1> 	pop	eax ; cheight * nbcols
  2934 00002186 F7E2                <1> 	mul	edx
  2935                              <1> 	; eax = ydest * cheight * nbcols
  2936 00002188 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2937 0000218A 01D0                <1>  	add	eax, edx
  2938 0000218C 89C7                <1> 	mov	edi, eax ; dest
  2939 0000218E 66C1E703            <1> 	shl	di, 3 ; * 8 ; 06/08/2016
  2940                              <1> 	; esi = src
  2941                              <1> 	; edi = dest
  2942                              <1> 	; for(i=0;i<cheight;i++)
  2943                              <1>   	; {
  2944                              <1>    	;  memcpyb(0xa000,dest+i*nbcols,0xa000,src+i*nbcols,cols);
  2945                              <1>   	; }
  2946 00002192 51                  <1> 	push	ecx
  2947 00002193 B900000A00          <1> 	mov	ecx, 0A0000h
  2948 00002198 01CE                <1> 	add	esi, ecx
  2949 0000219A 01CF                <1> 	add	edi, ecx
  2950                              <1> 	; 08/08/2016
  2951 0000219C 8A35[265E0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2952                              <1> 	;; 07/08/2016
  2953                              <1> 	;mov	dh, 8 ; 07/08/2016
  2954 000021A2 28D2                <1> 	sub	dl, dl ; i
  2955                              <1> vgamem_copy_l8_0:
  2956 000021A4 56                  <1> 	push	esi
  2957 000021A5 57                  <1> 	push	edi
  2958 000021A6 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2959 000021AD F6E2                <1> 	mul	dl
  2960                              <1> 	; eax = i * nbcols
  2961 000021AF 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  2962 000021B3 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2963 000021B5 01C6                <1> 	add	esi, eax
  2964 000021B7 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2965 000021BA 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  2966 000021BE F3A4                <1> 	rep	movsb
  2967 000021C0 5F                  <1> 	pop	edi
  2968 000021C1 5E                  <1> 	pop	esi
  2969 000021C2 FEC2                <1> 	inc	dl ; 06/08/2016
  2970 000021C4 FECE                <1> 	dec	dh
  2971 000021C6 75DC                <1> 	jnz	short vgamem_copy_l8_0
  2972                              <1> vgamem_copy_l8_1:
  2973 000021C8 59                  <1> 	pop	ecx
  2974                              <1> 
  2975                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2976                              <1> 	;mov	ax, 0005h
  2977                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2978                              <1> 	;out	dx, ax
  2979                              <1> 
  2980 000021C9 58                  <1> 	pop	eax
  2981 000021CA 5A                  <1> 	pop	edx
  2982                              <1> 
  2983 000021CB C3                  <1> 	retn
  2984                              <1> 
  2985                              <1> vgamem_fill_l8:
  2986                              <1> 	; 08/08/2016
  2987                              <1> 	; 07/08/2016
  2988                              <1> 	; 06/08/2016
  2989                              <1> 	; 04/08/2016
  2990                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2991                              <1> 	;
  2992                              <1> 	; TEMPORARY
  2993                              <1> 	;
  2994                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2995                              <1> 	; vgabios-0.7a (2011)
  2996                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2997                              <1> 	; 'vgabios.c', 'vgamem_fill_pl4'
  2998                              <1> 	;
  2999                              <1> 	; vgamem_fill_pl4(xstart,ystart,cols,nbcols,cheight,attr)
  3000                              <1> 	; cl = xstart, edi = ch = ystart, bh = cols,
  3001                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight, attr = 0
  3002                              <1> 
  3003                              <1> 	; dest=ystart*cheight*nbcols+xstart;
  3004 000021CC 52                  <1> 	push	edx
  3005 000021CD 50                  <1> 	push	eax
  3006                              <1> 
  3007                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0205)
  3008                              <1> 	;mov	ax, 0205h
  3009                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3010                              <1> 	;out	dx, ax
  3011                              <1> 
  3012                              <1>         ; 08/08/2016
  3013 000021CE 0FB605[265E0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  3014 000021D5 F6E5                <1> 	mul	ch
  3015                              <1> 	;; 07/08/2016
  3016                              <1> 	;movzx	eax, ch
  3017                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  3018 000021D7 0FB615[245E0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  3019 000021DE F7E2                <1> 	mul	edx
  3020                              <1> 	; edx  = 0
  3021 000021E0 88CA                <1> 	mov	dl, cl 
  3022 000021E2 01D0                <1> 	add	eax, edx
  3023 000021E4 89C7                <1> 	mov	edi, eax
  3024 000021E6 66C1E703            <1> 	shl	di, 3 ; * 8 ; 06/08/2016
  3025                              <1> 	; edi = dest
  3026                              <1> 	; for(i=0;i<cheight;i++)
  3027                              <1>   	; {
  3028                              <1>    	;  memsetb(0xa000,dest+i*nbcols,attr,cols);
  3029                              <1>   	; }
  3030 000021EA 81C700000A00        <1> 	add	edi, 0A0000h
  3031 000021F0 51                  <1> 	push	ecx
  3032                              <1> 	; 08/08/2016
  3033 000021F1 8A35[265E0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  3034                              <1> 	;; 07/08/2016
  3035                              <1> 	;mov	dh, 8 ; 07/08/2016
  3036 000021F7 28D2                <1> 	sub	dl, dl ; i
  3037                              <1> vgamem_fill_l8_0:
  3038 000021F9 57                  <1> 	push	edi
  3039 000021FA 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS]
  3040 00002201 F6E2                <1> 	mul	dl
  3041                              <1> 	; eax = i * nbcols
  3042 00002203 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  3043 00002207 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  3044 00002209 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  3045 0000220B 0FB6CF              <1> 	movzx	ecx, bh ; cols
  3046 0000220E 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  3047 00002212 F3AA                <1>  	rep	stosb
  3048 00002214 5F                  <1> 	pop	edi
  3049 00002215 FEC2                <1> 	inc	dl ; 06/08/2016
  3050 00002217 FECE                <1> 	dec	dh
  3051 00002219 75DE                <1> 	jnz	short vgamem_fill_l8_0
  3052                              <1> vgamem_fill_l8_1:
  3053 0000221B 59                  <1> 	pop	ecx
  3054                              <1> 
  3055                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  3056                              <1> 	;mov	ax, 0005h
  3057                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3058                              <1> 	;out	dx, ax
  3059                              <1> 
  3060 0000221C 58                  <1> 	pop	eax
  3061 0000221D 5A                  <1> 	pop	edx 
  3062                              <1> 
  3063 0000221E C3                  <1> 	retn
  3064                              <1> 
  3065                              <1> vga_graphics_down:
  3066                              <1> 	; 08/08/2016
  3067                              <1> 	; 07/08/2016
  3068                              <1> 	; 31/07/2016
  3069                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  3070                              <1> 	;
  3071                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3072                              <1> 	; vgabios-0.7a (2011)
  3073                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3074                              <1> 	; 'vgabios.c', 'biosfn_scroll'
  3075                              <1> 	;
  3076                              <1> 
  3077                              <1> 	; cl = upper left column
  3078                              <1> 	; ch = upper left row
  3079                              <1> 	; dl = lower rigth column
  3080                              <1> 	; dh = lower right row
  3081                              <1> 	;
  3082                              <1> 	; al = line count (AL=0 means blank entire fields)
  3083                              <1> 	; bl = fill value for blanked lines	
  3084                              <1> 	; bh = unused
  3085                              <1> 	;
  3086                              <1> 	; ah = [CRT_MODE], current video mode	
  3087                              <1> 
  3088 0000221F FC                  <1>         cld     ; !!! Clear direction flag !!! 
  3089                              <1> 
  3090 00002220 88C7                <1> 	mov	bh, al ; 31/07/2016
  3091                              <1> 
  3092 00002222 BE[3E5E0000]        <1> 	mov	esi, vga_modes
  3093 00002227 89F7                <1> 	mov	edi, esi
  3094 00002229 83C710              <1> 	add	edi, vga_mode_count
  3095                              <1> vga_g_down_0:
  3096 0000222C AC                  <1> 	lodsb
  3097 0000222D 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  3098 0000222F 7405                <1> 	je	short vga_g_down_1
  3099 00002231 39FE                <1> 	cmp	esi, edi
  3100 00002233 72F7                <1> 	jb	short vga_g_down_0
  3101                              <1> 	; xor 	bh, bh	; 31/07/2016
  3102 00002235 C3                  <1> 	retn	; nothing to do
  3103                              <1> vga_g_down_1:
  3104 00002236 88F8                <1> 	mov	al, bh ; 31/07/2016
  3105 00002238 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  3106                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  3107                              <1> 	
  3108                              <1> 	; if(rlr>=nbrows)rlr=nbrows-1;
  3109                              <1>  	; if(clr>=nbcols)clr=nbcols-1;
  3110                              <1>  	; if(nblines>nbrows)nblines=0;
  3111                              <1>  	; cols=clr-cul+1;
  3112                              <1> 
  3113 0000223B 3A35[2A5E0000]      <1> 	cmp	dh, [VGA_ROWS]
  3114 00002241 7208                <1> 	jb	short vga_g_down_2
  3115 00002243 8A35[2A5E0000]      <1> 	mov	dh, [VGA_ROWS]
  3116 00002249 FECE                <1> 	dec	dh
  3117                              <1> vga_g_down_2:
  3118 0000224B 3A15[245E0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  3119 00002251 7208                <1> 	jb	short vga_g_down_3
  3120 00002253 8A15[245E0000]      <1> 	mov	dl, [CRT_COLS]
  3121 00002259 FECA                <1> 	dec	dl
  3122                              <1> vga_g_down_3:	
  3123 0000225B 3A05[2A5E0000]      <1> 	cmp	al, [VGA_ROWS]
  3124 00002261 7602                <1> 	jna	short vga_g_down_4
  3125 00002263 28C0                <1> 	sub	al, al ; 0
  3126                              <1> vga_g_down_4:
  3127 00002265 88F7                <1> 	mov	bh, dh ; clr
  3128 00002267 28CF                <1> 	sub	bh, cl ; cul
  3129 00002269 FEC7                <1> 	inc	bh ; cols = clr-cul+1
  3130                              <1> 
  3131 0000226B 20C0                <1> 	and	al, al ; nblines = 0
  3132 0000226D 755B                <1> 	jnz	short vga_g_down_6
  3133 0000226F 20ED                <1> 	and	ch, ch ; rul = 0
  3134 00002271 7557                <1> 	jnz	short vga_g_down_6
  3135 00002273 20C9                <1> 	and	cl, cl ; cul = 0
  3136 00002275 7553                <1> 	jnz	short vga_g_down_6
  3137                              <1> 
  3138 00002277 6650                <1> 	push	ax
  3139 00002279 A0[2A5E0000]        <1> 	mov	al, [VGA_ROWS]
  3140 0000227E FEC8                <1> 	dec	al  
  3141 00002280 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  3142 00002282 7544                <1> 	jne	short vga_g_down_5
  3143 00002284 A0[245E0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  3144 00002289 FEC8                <1> 	dec	al 
  3145 0000228B 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  3146 0000228D 7539                <1> 	jne	short vga_g_down_5
  3147 0000228F 6658                <1> 	pop	ax
  3148                              <1> 
  3149 00002291 66B80502            <1> 	mov	ax, 0205h
  3150 00002295 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3151 00002299 66EF                <1> 	out	dx, ax
  3152 0000229B A0[2A5E0000]        <1> 	mov	al, [VGA_ROWS]
  3153 000022A0 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  3154 000022A6 F6E4                <1> 	mul	ah
  3155 000022A8 0FB7D0              <1> 	movzx	edx, ax
  3156                              <1> 	; 08/08/2016
  3157 000022AB 0FB605[265E0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  3158 000022B2 F7E2                <1> 	mul	edx
  3159                              <1> 	; eax = byte count	
  3160 000022B4 89C1                <1> 	mov	ecx, eax
  3161                              <1> 	;; 07/08/2016
  3162                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  3163                              <1> 	;mov	ecx, edx
  3164 000022B6 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  3165 000022B8 BF00000A00          <1> 	mov	edi, 0A0000h
  3166 000022BD F3AA                <1> 	rep	stosb			
  3167                              <1> 	
  3168 000022BF B005                <1> 	mov	al, 5
  3169 000022C1 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3170 000022C5 66EF                <1> 	out	dx, ax ; 0005h	
  3171                              <1> 
  3172 000022C7 C3                  <1> 	retn
  3173                              <1> 
  3174                              <1> vga_g_down_5:
  3175 000022C8 6658                <1> 	pop	ax
  3176                              <1> 
  3177                              <1> vga_g_down_6:
  3178                              <1> 	; [ESI] = VGA memory model number for current video mode
  3179                              <1>         ;
  3180                              <1>         ; LINEAR8 equ 5
  3181                              <1>         ; PLANAR4 equ 4
  3182                              <1>         ; PLANAR1 equ 3
  3183                              <1> 
  3184 000022CA 803E04              <1> 	cmp	byte [esi], PLANAR4
  3185 000022CD 742C                <1> 	je	short vga_g_down_planar
  3186 000022CF 803E03              <1> 	cmp	byte [esi], PLANAR1
  3187 000022D2 7427                <1> 	je	short vga_g_down_planar
  3188                              <1> vga_g_down_linear8:
  3189                              <1> 	; 07/07/2016 (TEMPORARY)
  3190                              <1> 	;
  3191                              <1> 	; cl = upper left column ; cul
  3192                              <1> 	; ch = upper left row ; rul
  3193                              <1> 	; dl = lower rigth column ; clr
  3194                              <1> 	; dh = lower right row ; rlr
  3195                              <1> 
  3196                              <1> vga_g_down_l0:
  3197                              <1> 	;{for(i=rlr;i>=rul;i--)
  3198                              <1>         ; if((i<rul+nblines)||(nblines==0))
  3199 000022D4 08C0                <1> 	or	al, al
  3200 000022D6 741C                <1> 	jz	short vga_g_down_l2
  3201 000022D8 88C4                <1> 	mov	ah, al
  3202 000022DA 00EC                <1> 	add	ah, ch
  3203                              <1> 	;jc	short vga_g_down_l2	
  3204 000022DC 86EE                <1> 	xchg	ch, dh
  3205 000022DE 38E5                <1> 	cmp	ch, ah
  3206 000022E0 7212                <1> 	jb	short vga_g_down_l2
  3207 000022E2 88EC                <1> 	mov	ah, ch
  3208 000022E4 28C4                <1> 	sub	ah, al ; ah = i - nblines
  3209                              <1> 	; else
  3210                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  3211 000022E6 E877FEFFFF          <1> 	call	vgamem_copy_l8
  3212                              <1> vga_g_down_l1:
  3213 000022EB 86F5                <1> 	xchg	dh, ch
  3214 000022ED FECE                <1> 	dec	dh 
  3215 000022EF 38EE                <1> 	cmp	dh, ch
  3216 000022F1 73E1                <1> 	jnb	short vga_g_down_l0
  3217 000022F3 C3                  <1> 	retn
  3218                              <1> 
  3219                              <1> vga_g_down_l2:
  3220                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  3221 000022F4 E8D3FEFFFF          <1> 	call	vgamem_fill_l8
  3222 000022F9 EBF0                <1> 	jmp	short vga_g_down_l1
  3223                              <1> 		 
  3224                              <1> vga_g_down_planar:
  3225                              <1> 	; cl = upper left column ; cul
  3226                              <1> 	; ch = upper left row ; rul
  3227                              <1> 	; dl = lower rigth column ; clr
  3228                              <1> 	; dh = lower right row ; rlr
  3229                              <1> vga_g_down_pl0:
  3230                              <1>  	;{for(i=rlr;i>=rul;i--)
  3231                              <1>         ; if((i<rul+nblines)||(nblines==0))
  3232 000022FB 08C0                <1> 	or	al, al
  3233 000022FD 741C                <1> 	jz	short vga_g_down_pl2
  3234 000022FF 88C4                <1> 	mov	ah, al
  3235 00002301 00EC                <1> 	add	ah, ch
  3236                              <1> 	;jc	short vga_g_down_pl2	
  3237 00002303 86EE                <1> 	xchg	ch, dh
  3238 00002305 38E5                <1> 	cmp	ch, ah
  3239 00002307 7212                <1> 	jb	short vga_g_down_pl2
  3240 00002309 88EC                <1> 	mov	ah, ch
  3241 0000230B 28C4                <1> 	sub	ah, al ; ah = i - nblines
  3242                              <1> 	; else
  3243                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  3244 0000230D E88BFDFFFF          <1> 	call	vgamem_copy_pl4
  3245                              <1> vga_g_down_pl1:
  3246 00002312 86F5                <1> 	xchg	dh, ch
  3247 00002314 FECE                <1> 	dec	dh 
  3248 00002316 38EE                <1> 	cmp	dh, ch
  3249 00002318 73E1                <1> 	jnb	short vga_g_down_pl0
  3250 0000231A C3                  <1> 	retn
  3251                              <1> 
  3252                              <1> vga_g_down_pl2:
  3253                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  3254 0000231B E8EBFDFFFF          <1> 	call	vgamem_fill_pl4
  3255 00002320 EBF0                <1> 	jmp	short vga_g_down_pl1
  3256                              <1> 
  3257                              <1> ; 07/07/2016
  3258                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  3259                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3260                              <1> ;------------------------------------------------------
  3261                              <1> ; SCROLL DOWN
  3262                              <1> ;  THIS ROUTINE SCROLLS DOWN THE INFORMATION ON THE CRT
  3263                              <1> ; ENTRY --
  3264                              <1> ;  CH,CL = UPPER LEFT CORNER OF REGION TO SCROLL
  3265                              <1> ;  DH,DL = LOWER RIGHT CORNER OF REGION TO SCROLL
  3266                              <1> ;   BOTH OF THE ABOVE ARE IN CHARACTER POSITIONS
  3267                              <1> ;  BH = FILL VALUE FOR BLANKED LINES
  3268                              <1> ;  AL = # LINES TO SCROLL (AL=0 MEANS BLANK THE ENTIRE FIELD)
  3269                              <1> ;  DS = DATA SEGMENT
  3270                              <1> ;  ES = REGEN SEGMENT
  3271                              <1> ; EXIT --
  3272                              <1> ;  NOTHING, THE SCREEN IS SCROLLED
  3273                              <1> ;--------------------------------------------------------
  3274                              <1> 
  3275                              <1> 	; cl = upper left column
  3276                              <1> 	; ch = upper left row
  3277                              <1> 	; dl = lower rigth column
  3278                              <1> 	; dh = lower right row
  3279                              <1> 	;
  3280                              <1> 	; al = line count (AL=0 means blank entire fields)
  3281                              <1> 	; bl = fill value for blanked lines	
  3282                              <1> 	; bh = unused
  3283                              <1> 
  3284                              <1> GRAPHICS_DOWN:
  3285                              <1> 	; 07/07/2016
  3286                              <1> 	;AH = Current video mode, [CRT_MODE]
  3287                              <1> 	;STD				; SET DIRECTION
  3288 00002322 80FC07              <1> 	cmp	ah, 7
  3289 00002325 0F87F4FEFFFF        <1>         ja      vga_graphics_down
  3290                              <1> 	;je	_n0
  3291                              <1> 
  3292 0000232B 88C7                <1> 	MOV	bh, al			; save line count in BH
  3293 0000232D 6689D0              <1> 	MOV	AX, DX			; GET LOWER RIGHT POSITION INTO AX REG
  3294                              <1> 
  3295                              <1> ;-----	USE CHARACTER SUBROUTINE FOR POSITIONING
  3296                              <1> ;-----	ADDRESS RETURNED IS MULTIPLIED BY 2 FROM CORRECT VALUE
  3297                              <1> 
  3298 00002330 E8F1010000          <1> 	CALL	GRAPH_POSN
  3299 00002335 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  3300                              <1> 
  3301                              <1> ;-----	DETERMINE SIZE OF WINDOW
  3302                              <1> 
  3303 00002338 6629CA              <1> 	SUB	DX, CX
  3304 0000233B 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  3305 00002340 C0E602              <1> 	SAL	DH, 2			; MULTIPLY ROWS BY 4 AT 8 VERT DOTS/CHAR
  3306                              <1> 					; AND EVEN/ODD ROWS
  3307                              <1> 
  3308                              <1> ;-----	DETERMINE CRT MODE
  3309                              <1> 
  3310 00002343 803D[225E0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  3311 0000234A 7307                <1>         JNC     short _R12              ; FIND_SOURCE_DOWN
  3312                              <1> 
  3313                              <1> ;-----	MEDIUM RES DOWN
  3314 0000234C D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  3315 0000234E 66D1E7              <1> 	SAL	DI, 1			; OFFSET *2 SINCE 2 BYTES/CHAR
  3316 00002351 6647                <1> 	INC	DI			; POINT TO LAST BYTE
  3317                              <1> 
  3318                              <1> ;-----	DETERMINE THE SOURCE ADDRESS IN THE BUFFER
  3319                              <1> 
  3320                              <1> _R12:                                   ; FIND_SOURCE_DOWN
  3321 00002353 81C700800B00        <1> 	add	edi, 0B8000h		
  3322 00002359 6681C7F000          <1> 	ADD	DI, 240			; POINT TO LAST ROW OF PIXELS
  3323 0000235E C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  3324 00002361 74(06)              <1> 	JZ	short 6			; IF ZERO, THEN BLANK ENTIRE FIELD
  3325 00002363 B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  3326 00002365 F6E7                <1> 	mul	bh			; determine offset to source
  3327 00002367 89FE                <1> 	MOV	eSI, eDI		; SET UP SOURCE
  3328 00002369 6629C6              <1> 	SUB	SI, AX			; SUBTRACT THE OFFSET
  3329 0000236C 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  3330 0000236E 28FC                <1> 	sub	ah, bh			; determine number to move
  3331                              <1> 
  3332                              <1> ;-----	LOOP THROUGH, MOVING ONE ROW AT A TIME, BOTH EVEN AND ODD FIELDS
  3333                              <1> 
  3334                              <1> _R13:                                   ; ROW_LOOP_DOWN
  3335 00002370 E823000000          <1>         CALL    _R17                    ; MOVE ONE ROW
  3336 00002375 6681EE5020          <1> 	SUB	SI, 2000h+80		; MOVE TO NEXT ROW
  3337 0000237A 6681EF5020          <1> 	SUB	DI, 2000h+80
  3338 0000237F FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  3339 00002381 75ED                <1>         JNZ     short _R13              ; CONTINUE TILL ALL MOVED
  3340                              <1> 
  3341                              <1> ;-----	FILL IN THE VACATED LINE(S)
  3342                              <1> _R14:                                   ; CLEAR_ENTRY_DOWN
  3343 00002383 88D8                <1> 	mov	al, bl			; attribute to fill with
  3344                              <1> _R15_:                                  ; CLEAR_LOOP_DOWN
  3345 00002385 E82A000000          <1> 	CALL	_R18			; CLEAR A ROW
  3346 0000238A 6681EF5020          <1> 	SUB	DI, 2000h+80		; POINT TO NEXT LINE
  3347 0000238F FECF                <1> 	dec	bh			; number of lines to fill
  3348 00002391 75F2                <1>         JNZ     short _R15_             ; CLEAR_LOOP_DOWN
  3349                              <1> 
  3350 00002393 C3                  <1> 	retn				; EVERYYHING DONE
  3351                              <1> 
  3352                              <1> _R16:                                   ; BLANK_FIELD_DOWN
  3353 00002394 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  3354 00002396 EBEB                <1>         JMP     short _R14              ; CLEAR THE FIELD
  3355                              <1> 
  3356                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  3357                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3358                              <1> 
  3359                              <1> ;-----	ROUTINE TO MOVE ONE ROW OF INFORMATION
  3360                              <1> 
  3361                              <1> _R17:
  3362 00002398 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN THE ROW
  3363 0000239B 56                  <1> 	PUSH	eSI
  3364 0000239C 57                  <1> 	PUSH	eDI			; SAVE POINTERS
  3365 0000239D F3A4                <1> 	REP	MOVSB			; MOVE THE EVEN FIELD
  3366 0000239F 5F                  <1> 	POP	eDI
  3367 000023A0 5E                  <1> 	POP	eSI
  3368 000023A1 6681C60020          <1> 	ADD	SI, 2000h
  3369 000023A6 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO THE ODD FIELD
  3370 000023AB 56                  <1> 	PUSH	eSI
  3371 000023AC 57                  <1> 	PUSH	eDI			; SAVE THE POINTERS
  3372 000023AD 88D1                <1> 	MOV	CL, DL			; COUNT BACK
  3373 000023AF F3A4                <1> 	REP	MOVSB			; MOVE THE ODD FIELD
  3374 000023B1 5F                  <1> 	POP	eDI
  3375 000023B2 5E                  <1> 	POP	eSI			; POINTERS BACK
  3376 000023B3 C3                  <1> 	RETn				; RETURN TO CALLER
  3377                              <1> 
  3378                              <1> ;-----	CLEAR A SINGLE ROW
  3379                              <1> 
  3380                              <1> _R18:
  3381 000023B4 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN FIELD
  3382 000023B7 57                  <1> 	PUSH	eDI			; SAVE POINTER
  3383 000023B8 F3AA                <1> 	REP	STOSB			; STORE THE NEW VALUE
  3384 000023BA 5F                  <1> 	POP	eDI			; POINTER BACK
  3385 000023BB 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO ODD FIELD
  3386 000023C0 57                  <1> 	PUSH	eDI
  3387 000023C1 88D1                <1> 	MOV	CL, DL
  3388 000023C3 F3AA                <1> 	REP	STOSB			; FILL THE ODD FIELD
  3389 000023C5 5F                  <1> 	POP	eDI
  3390 000023C6 C3                  <1> 	RETn				; RETURN TO CALLER
  3391                              <1> 
  3392                              <1> ; 04/07/2016
  3393                              <1> ; 01/07/2016
  3394                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3395                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3396                              <1> ;--------------------------------------------------
  3397                              <1> ; GRAPHICS WRITE
  3398                              <1> ;  THIS ROUTINE WRITES THE ASCII CHARACTER TO THE CURRENT
  3399                              <1> ;  POSITION ON THE SCREEN.
  3400                              <1> ; ENTRY --
  3401                              <1> ;  AL = CHARACTER TO WRITE
  3402                              <1> ;  BL = COLOR ATTRIBUTE TO BE USED FOR FOREGROUND COLOR
  3403                              <1> ;	IF BIT 7 IS SET, THE CHAR IS XOR'D INTO THE REGEN BUFFER
  3404                              <1> ;	(0 IS USED FOR THE BACKGROUND COLOR)
  3405                              <1> ;  CX = NUMBER OF CHARS TO WRITE
  3406                              <1> ;  DS = DATA SEGMENT
  3407                              <1> ;  ES = REGEN SEGMENT
  3408                              <1> ; EXIT --
  3409                              <1> ;  NOTHING IS RETURNED
  3410                              <1> ;
  3411                              <1> ; GRAPHICS READ
  3412                              <1> ;  THIS ROUTINE READS THE ASCII CHARACTER AT THE CURRENT CURSOR
  3413                              <1> ;  POSITION ON THE SCREEN BY MATCHING THE DOTS ON THE SCREEN TO THE
  3414                              <1> ;  CHARACTER GENERATOR CODE POINTS
  3415                              <1> ; ENTRY --
  3416                              <1> ;  NONE (0 IS ASSUMED AS THE BACKGROUND COLOR)
  3417                              <1> ; EXIT --
  3418                              <1> ;  AL = CHARACTER READ AT THAT POSITION (0 RETURNED IF NONE FOUND)
  3419                              <1> ;
  3420                              <1> ; FOR BOTH ROUTINES, THE IMAGES USED TO FORM CHARS ARE CONTAINED IN ROM
  3421                              <1> ;  FOR THE 1ST 128 CHARS.  TO ACCESS CHARS IN THE SECOND HALF, THE USER
  3422                              <1> ;  MUST INITIALIZE THE VECTOR AT INTERRUPT 1FH (LOCATION 0007CH) TO
  3423                              <1> ;  POINT TO THE USER SUPPLIED TABLE OF GRAPHIC IMAGES (8X8 BOXES).
  3424                              <1> ;  FAILURE TO DO SO WILL CAUSE IN STRANGE RESULTS
  3425                              <1> ;-----------------------------------------------------
  3426                              <1> 
  3427                              <1> GRAPHICS_WRITE:
  3428 000023C7 25FF000000          <1> 	and 	eax, 0FFh		; ZERO TO HIGH OF CODE POINT
  3429 000023CC 50                  <1> 	PUSH	eAX			; SAVE CODE POINT VALUE
  3430                              <1> 
  3431                              <1> ;-----	DETERMINE POSITION IN REGEN BUFFER TO PUT CODE POINTS
  3432                              <1> 
  3433 000023CD E84D010000          <1> 	CALL	S26			; FIND LOCATION IN REGEN BUFFER
  3434 000023D2 89C7                <1> 	MOV	eDI, eAX		; REGEN POINTER IN DI
  3435                              <1> 
  3436                              <1> ;-----	DETERMINE REGION TO GET CODE POINTS FROM
  3437                              <1> 
  3438 000023D4 58                  <1> 	POP	eAX			; RECOVER CODE POINT
  3439                              <1> 
  3440 000023D5 BE[5C160100]        <1> 	MOV	eSI, CRT_CHAR_GEN	; OFFSET OF IMAGES
  3441                              <1> 
  3442                              <1> ;-----	DETERMINE GRAPHICS MODE IN OPERATION
  3443                              <1> 					; DETERMINE_MODE
  3444 000023DA 66C1E003            <1> 	SAL	AX, 3			; MULTIPLY CODE POINT VALUE BY 8
  3445 000023DE 01C6                <1> 	ADD	eSI, eAX		; SI HAS OFFSET OF DESIRED CODES
  3446                              <1> 	
  3447 000023E0 803D[225E0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3448 000023E7 7231                <1> 	JC	short S6		; TEST FOR MEDIUM RESOLUTION MODE
  3449                              <1> 
  3450                              <1> ;-----	HIGH RESOLUTION MODE
  3451                              <1> 
  3452 000023E9 81C700800B00        <1> 	add	edi, 0B8000h
  3453                              <1> S1:					; HIGH_CHAR
  3454 000023EF 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  3455 000023F0 56                  <1> 	PUSH	eSI			; SAVE CODE POINTER
  3456 000023F1 B604                <1> 	MOV	DH, 4			; NUMBER OF TIMES THROUGH LOOP
  3457                              <1> S2:
  3458 000023F3 AC                  <1> 	LODSB				; GET BYTE FROM CODE POINTS
  3459 000023F4 F6C380              <1> 	TEST	BL, 80H			; SHOULD WE USE THE FUNCTION
  3460 000023F7 7515                <1> 	JNZ	short S5		; TO PUT CHAR IN
  3461 000023F9 AA                  <1> 	STOSB				; STORE IN REGEN BUFFER
  3462 000023FA AC                  <1> 	LODSB
  3463                              <1> S4:
  3464 000023FB 8887FF1F0000        <1> 	MOV	[eDI+2000H-1], AL ; STORE IN SECOND HALF
  3465 00002401 83C74F              <1> 	ADD	eDI, 79			; MOVE TO NEXT ROW IN REGEN
  3466 00002404 FECE                <1> 	DEC	DH			; DONE WITH LOOP
  3467 00002406 75EB                <1> 	JNZ	short S2
  3468 00002408 5E                  <1> 	POP	eSI
  3469 00002409 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  3470 0000240A 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  3471 0000240B E2E2                <1> 	LOOP	S1			; MORE CHARS TO WRITE
  3472 0000240D C3                  <1> 	retn
  3473                              <1> 
  3474                              <1> S5:
  3475 0000240E 3207                <1> 	XOR	AL, [eDI]		; EXCLUSIVE OR WITH CURRENT
  3476 00002410 AA                  <1> 	STOSB				; STORE THE CODE POINT
  3477 00002411 AC                  <1> 	LODSB				; AGAIN FOR ODD FIELD
  3478 00002412 3287FF1F0000        <1> 	XOR	AL, [eDI+2000H-1]
  3479 00002418 EBE1                <1> 	JMP	short S4		; BACK TO MAINSTREAM
  3480                              <1> 
  3481                              <1> ;-----	MEDIUM RESOLUTION WRITE
  3482                              <1> S6:					; MED_RES_WRITE
  3483 0000241A 88DA                <1> 	MOV	DL, BL			; SAVE HIGH COLOR BIT
  3484 0000241C 66D1E7              <1> 	SAL	DI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  3485                              <1> 					; EXPAND BL TO FULL WORD OF COLOR
  3486 0000241F 80E303              <1> 	AND	BL, 3			; ISOLATE THE COLOR BITS ( LOW 2 BITS )
  3487 00002422 B055                <1> 	MOV	AL, 055H 		; GET BIT CONVERSION MULTIPLIER
  3488 00002424 F6E3                <1> 	MUL	BL			; EXPAND 2 COLOR BITS TO 4 REPLICATIONS
  3489 00002426 88C3                <1> 	MOV	BL, AL			; PLACE BACK IN WORK REGISTER
  3490 00002428 88C7                <1> 	MOV	BH, AL			; EXPAND TO 8 REPLICATIONS OF COLOR BITS
  3491 0000242A 81C700800B00        <1> 	add	edi, 0B8000h
  3492                              <1> S7:                                     ; MED_CHAR
  3493 00002430 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  3494 00002431 56                  <1> 	PUSH	eSI			; SAVE THE CODE POINTER
  3495 00002432 B604                <1> 	MOV	DH, 4			; NUMBER OF LOOPS
  3496                              <1> S8:
  3497 00002434 AC                  <1> 	LODSB				; GET CODE POINT
  3498 00002435 E8B3000000          <1> 	CALL	S21			; DOUBLE UP ALL THE BITS
  3499 0000243A 6621D8              <1> 	AND	AX, BX			; CONVERT TO FOREGROUND COLOR ( 0 BACK )
  3500 0000243D 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  3501 0000243F F6C280              <1> 	TEST	DL, 80H			; IS THIS XOR FUNCTION
  3502 00002442 7403                <1> 	JZ	short S9		; NO, STORE IT IN AS IS
  3503 00002444 663307              <1> 	XOR	AX, [eDI]		; DO FUNCTION WITH LOW/HIGH
  3504                              <1> S9:
  3505 00002447 668907              <1> 	MOV	[eDI], AX		; STORE FIRST BYTE HIGH, SECOND LOW
  3506 0000244A AC                  <1> 	LODSB				; GET CODE POINT
  3507 0000244B E89D000000          <1> 	CALL	S21
  3508 00002450 6621D8              <1> 	AND	AX, BX			; CONVERT TO COLOR
  3509 00002453 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  3510 00002455 F6C280              <1> 	TEST	DL, 80H			; AGAIN, IS THIS XOR FUNCTION
  3511 00002458 7407                <1> 	JZ	short _S10		; NO, JUST STORE THE VALUES
  3512 0000245A 66338700200000      <1> 	XOR	AX, [eDI+2000H]		; FUNCTION WITH FIRST HALF LOW
  3513                              <1> _S10:
  3514 00002461 66898700200000      <1> 	MOV	[eDI+2000H], AX		; STORE SECOND PORTION HIGH
  3515 00002468 6683C750            <1> 	ADD	DI, 80			; POINT TO NEXT LOCATION
  3516 0000246C FECE                <1> 	DEC	DH
  3517 0000246E 75C4                <1> 	JNZ	short S8		; KEEP GOING
  3518 00002470 5E                  <1> 	POP	eSI			; RECOVER CODE POINTER
  3519 00002471 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  3520 00002472 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  3521 00002473 47                  <1> 	INC	eDI
  3522 00002474 E2BA                <1> 	LOOP	S7			; MORE TO WRITE
  3523 00002476 C3                  <1> 	retn
  3524                              <1> 
  3525                              <1> ; 04/07/2016
  3526                              <1> ; 01/07/2016
  3527                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3528                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3529                              <1> ;----------------------------------------
  3530                              <1> ; GRAPHICS READ
  3531                              <1> ;----------------------------------------
  3532                              <1> GRAPHICS_READ:
  3533 00002477 E8A3000000          <1> 	CALL	S26			; CONVERTED TO OFFSET IN REGEN
  3534 0000247C 89C6                <1> 	MOV	eSI, eAX		; SAVE IN SI
  3535 0000247E 81C600800B00        <1> 	add	esi, 0B8000h		; 01/07/2016
  3536 00002484 83EC08              <1> 	SUB	eSP, 8			; ALLOCATE SPACE FOR THE READ CODE POINT
  3537 00002487 89E5                <1> 	MOV	eBP, eSP		; POINTER TO SAVE AREA
  3538                              <1> 
  3539                              <1> ;-----	DETERMINE GRAPHICS MODES
  3540 00002489 B604                <1> 	mov	dh, 4			; number of passes ; 01/07/2016
  3541 0000248B 803D[225E0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3542 00002492 7219                <1> 	JC	short S12		; MEDIUM RESOLUTION
  3543                              <1> 
  3544                              <1> ;-----	HIGH RESOLUTION READ
  3545                              <1> ;-----	GET VALUES FROM REGEN BUFFER AND CONVERT TO CODE POINT
  3546                              <1> 	;MOV	DH,4			; NUMBER OF PASSES
  3547                              <1> S11:
  3548 00002494 8A06                <1> 	MOV	AL, [eSI] 		; GET FIRST BYTE
  3549 00002496 884500              <1> 	MOV	[eBP], AL 		; SAVE IN STORAGE AREA
  3550 00002499 45                  <1> 	INC	eBP			; NEXT LOCATION
  3551 0000249A 8A8600200000        <1> 	MOV	AL, [eSI+2000H]		; GET LOWER REGION BYTE
  3552 000024A0 884500              <1> 	MOV	[eBP], AL 		; ADJUST AND STORE
  3553 000024A3 45                  <1> 	INC	eBP
  3554 000024A4 83C650              <1> 	ADD	eSI, 80			; POINTER INTO REGEN
  3555 000024A7 FECE                <1> 	DEC	DH			; LOOP CONTROL
  3556 000024A9 75E9                <1> 	JNZ	short S11		; DO IT SOME MORE
  3557 000024AB EB1D                <1> 	JMP	SHORT S14		; GO MATCH THE SAVED CODE POINTS
  3558                              <1> 
  3559                              <1> ;-----	MEDIUM RESOLUTION READ
  3560                              <1> S12:	
  3561 000024AD 66D1E6              <1> 	SAL	SI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  3562                              <1> 	;MOV	DH, 4			; NUMBER OF PASSES
  3563                              <1> S13:
  3564 000024B0 E84D000000          <1> 	CALL	S23			; GET BYTES FROM REGEN INTO SINGLE SAVE
  3565 000024B5 81C6FE1F0000        <1> 	ADD	eSI, 2000H-2		; GO TO LOWER REGION
  3566 000024BB E842000000          <1> 	CALL	S23			; GET THIS PAIR INTO SAVE
  3567 000024C0 81EEB21F0000        <1> 	SUB	eSI, 2000H-80+2		; ADJUST POINTER BACK INTO UPPER
  3568 000024C6 FECE                <1> 	DEC	DH
  3569 000024C8 75E6                <1> 	JNZ	short S13		; KEEP GOING UNTIL ALL 8 DONE
  3570                              <1> 
  3571                              <1> ;-----	SAVE AREA HAS CHARACTER IN IT, MATCH IT
  3572                              <1> S14:					; FIND_CHAR
  3573 000024CA BF[5C160100]        <1> 	MOV	eDI, CRT_CHAR_GEN	; ESTABLISH ADDRESSING
  3574 000024CF 83ED08              <1> 	SUB	eBP, 8			; ADJUST POINTER TO START OF SAVE AREA
  3575 000024D2 89EE                <1> 	MOV	eSI, eBP
  3576                              <1> S15:
  3577 000024D4 66B80001            <1> 	mov	ax, 256			; NUMBER TO TEST AGAINST
  3578                              <1> S16:
  3579 000024D8 56                  <1> 	PUSH	eSI			; SAVE SAVE AREA POINTER
  3580 000024D9 57                  <1> 	PUSH	eDI			; SAVE CODE POINTER
  3581                              <1> 	;MOV	eCX, 4			; NUMBER OF WORDS TO MATCH
  3582                              <1> 	;REPE	CMPSW			; COMPARE THE 8 BYTES AS WORDS
  3583 000024DA A7                  <1> 	cmpsd				; compare first 4 bytes 
  3584 000024DB 7501                <1> 	jne	short S17		; 
  3585 000024DD A7                  <1> 	cmpsd				; compare last 4 bytes
  3586                              <1> S17:
  3587 000024DE 5F                  <1> 	POP	eDI			; RECOVER THE POINTERS
  3588 000024DF 5E                  <1> 	POP	eSI
  3589                              <1> 	;JZ	short S18		; IF ZERO FLAG SET, THEN MATCH OCCURRED
  3590 000024E0 7407                <1> 	je	short S18
  3591                              <1> 	;				; NO MATCH, MOVE ON TO NEXT
  3592 000024E2 83C708              <1> 	ADD	eDI, 8			; NEXT CODE POINT
  3593 000024E5 6648                <1> 	dec	ax			; LOOP CONTROL
  3594 000024E7 75EF                <1> 	JNZ	short S16		; DO ALL OF THEM
  3595                              <1> 
  3596                              <1> ;-----	CHARACTER IS FOUND ( AL=0 IF NOT FOUND )
  3597                              <1> S18:	
  3598 000024E9 83C408              <1> 	ADD	eSP, 8			; READJUST THE STACK, THROW AWAY SAVE
  3599 000024EC C3                  <1> 	retn				; ALL DONE
  3600                              <1> 
  3601                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3602                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3603                              <1> ;--------------------------------------------
  3604                              <1> ; EXPAND BYTE
  3605                              <1> ;  THIS ROUTINE TAKES THE BYTE IN AL AND DOUBLES ALL
  3606                              <1> ;  OF THE BITS, TURNING THE 8 BITS INTO 16 BITS.
  3607                              <1> ;  THE RESULT IS LEFT IN AX
  3608                              <1> ;--------------------------------------------
  3609                              <1> S21:
  3610 000024ED 6651                <1> 	PUSH	CX			; SAVE REGISTER
  3611                              <1> 	;MOV	CX, 8			; SHIFT COUNT REGISTER FOR ONE BYTE
  3612 000024EF B108                <1> 	mov	cl, 8
  3613                              <1> S22:
  3614 000024F1 D0C8                <1> 	ROR	AL,1			; SHIFT BITS, LOW BIT INTO CARRY FLAG
  3615 000024F3 66D1DD              <1> 	RCR	BP,1			; MOVE CARRY FLAG (LOW BIT INTO RESULTS
  3616 000024F6 66D1FD              <1> 	SAR	BP,1			; SIGN EXTEND HIGH BIT (DOUBLE IT)
  3617                              <1> 	;LOOP	S22			; REPEAT FOR ALL 8 BITS
  3618 000024F9 FEC9                <1> 	dec	cl
  3619 000024FB 75F4                <1> 	jnz	short S22
  3620 000024FD 6695                <1> 	XCHG	AX, BP			; MOVE RESULTS TO PARAMETER REGISTER
  3621 000024FF 6659                <1> 	POP	CX			; RECOVER REGISTER
  3622 00002501 C3                  <1> 	RETn				; ALL DONE
  3623                              <1> 
  3624                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3625                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3626                              <1> ;--------------------------------------------------
  3627                              <1> ; MED_READ_BYTE
  3628                              <1> ; THIS ROUTINE WILL TAKE 2 BYTES FROM THE REGEN BUFFER,
  3629                              <1> ;  COMPARE AGAINST THE CURRENT FOREGROUND COLOR, AND PLACE
  3630                              <1> ;  THE CORRESPONDING ON/OFF BIT PATTERN INTO THE CURRENT
  3631                              <1> ;  POSITION IN THE SAVE AREA
  3632                              <1> ; ENTRY --
  3633                              <1> ;  SI,DS = POINTER TO REGEN AREA OF INTEREST
  3634                              <1> ;  BX = EXPANDED FOREGROUND COLOR
  3635                              <1> ;  BP = POINTER TO SAVE AREA
  3636                              <1> ; EXIT --
  3637                              <1> ;  SI AND BP ARE INCREMENTED
  3638                              <1> ;----------------------------------------------------
  3639                              <1> S23:
  3640 00002502 66AD                <1> 	LODSW				; GET FIRST BYTE AND SECOND BYTES
  3641 00002504 86C4                <1> 	XCHG	AL, AH			; SWAP FOR COMPARE
  3642 00002506 66B900C0            <1> 	MOV	CX, 0C000H		; 2 BIT MASK TO TEST THE ENTRIES
  3643 0000250A B200                <1> 	MOV	DL, 0			; RESULT REGISTER
  3644                              <1> S24:
  3645 0000250C 6685C8              <1> 	TEST	AX, CX			; IS THIS SECTION BACKCROUND?
  3646 0000250F 7401                <1>         JZ      short S25               ; IF ZERO, IT IS BACKGROUND (CARRY=0)
  3647 00002511 F9                  <1> 	STC				; WASN'T, SO SET CARRY
  3648                              <1> S25:
  3649 00002512 D0D2                <1> 	RCL	DL, 1			; MOVE THAT BIT INTO THE RESULT
  3650 00002514 66C1E902            <1> 	SHR	CX, 2			; MOVE THE MASK TO THE RIGHT BY 2 BITS
  3651 00002518 73F2                <1> 	JNC	short S24		; DO IT AGAIN IF MASK DIDN'T FALL OUT
  3652 0000251A 885500              <1> 	MOV	[eBP], DL 		; STORE RESULT IN SAVE AREA
  3653 0000251D 45                  <1> 	INC	eBP			; ADJUST POINTER
  3654 0000251E C3                  <1> 	RETn				; ALL DONE
  3655                              <1> 
  3656                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3657                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3658                              <1> ;-----------------------------------------
  3659                              <1> ; V4_POSITION
  3660                              <1> ;  THIS ROUTINE TAKES THE CURSOR POSITION CONTAINED IN
  3661                              <1> ;  THE MEMORY LOCATION, AND CONVERTS IT INTO AN OFFSET
  3662                              <1> ;  INTO THE REGEN BUFFER, ASSUMING ONE BYTE/CHAR.
  3663                              <1> ;  FOR MEDIUM RESOLUTION GRAPHICS, THE NUMBER MUST
  3664                              <1> ;  BE DOUBLED.
  3665                              <1> ; ENTRY -- NO REGISTERS,MEMORY LOCATION @CURSOR_POSN IS USED
  3666                              <1> ; EXIT--
  3667                              <1> ;  AX CONTAINS OFFSET INTO REGEN BUFFER
  3668                              <1> ;-----------------------------------------
  3669                              <1> S26:
  3670 0000251F 0FB705[FE410100]    <1> 	movzx	eax, word [CURSOR_POSN]	; GET CURRENT CURSOR
  3671                              <1> GRAPH_POSN:
  3672 00002526 53                  <1> 	PUSH	eBX			; SAVE REGISTER
  3673 00002527 0FB6D8              <1> 	movzx	ebx, al			; SAVE A COPY OF CURRENT CURSOR
  3674 0000252A A0[245E0000]        <1> 	MOV	AL, [CRT_COLS]		; GET BYTES PER COLUMN
  3675 0000252F F6E4                <1> 	MUL	AH			; MULTIPLY BY ROWS
  3676 00002531 66C1E002            <1> 	SHL	AX, 2			; MULTIPLY * 4 SINCE 4 ROWS/BYTE
  3677 00002535 01D8                <1> 	ADD	eAX, eBX		; DETERMINE OFFSET
  3678 00002537 5B                  <1> 	POP	eBX			; RECOVER POINTER
  3679 00002538 C3                  <1> 	RETn				; ALL DONE
  3680                              <1> 
  3681                              <1> ; 09/07/2016
  3682                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3683                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3684                              <1> ;---------------------------------------------
  3685                              <1> ; SET_COLOR
  3686                              <1> ;	THIS ROUTINE WILL ESTABLISH THE BACKGROUND COLOR, THE OVERSCAN COLOR,
  3687                              <1> ;	AND THE FOREGROUND COLOR SET FOR MEDIUM RESOLUTION GRAPHICS
  3688                              <1> ; INPUT
  3689                              <1> ;	(BH) HAS COLOR ID
  3690                              <1> ;		IF BH=0, THE BACKGROUND COLOR VALUE IS SET
  3691                              <1> ;			FROM THE LOW BITS OF BL (0-31)
  3692                              <1> ;		IF BH=1, THE PALETTE SELECTION IS MADE
  3693                              <1> ;			BASED ON THE LOW BIT OF BL:
  3694                              <1> ;				0 = GREEN, RED, YELLOW FOR COLORS 1,2,3
  3695                              <1> ;				1 = BLUE, CYAN, MAGENTA FOR COLORS 1,2,3
  3696                              <1> ;	(BL) HAS THE COLOR VALUE TO BE USED
  3697                              <1> ; OUTPUT
  3698                              <1> ;	THE COLOR SELECTION IS UPDATED
  3699                              <1> ;----------------------------------------------
  3700                              <1> SET_COLOR:
  3701 00002539 803D[225E0000]07    <1>         cmp     byte [CRT_MODE], 7      ; 09/07/2016
  3702 00002540 0F870EF0FFFF        <1> 	ja	VIDEO_RETURN		; nothing to do for VGA modes	 
  3703                              <1> 
  3704                              <1> 	;MOV	DX, [ADDR_6845]		; I/O PORT FOR PALETTE
  3705                              <1> 	;mov	dx, 3D4h
  3706                              <1> 	;ADD	DX,5			; OVERSCAN PORT
  3707 00002546 66BAD903            <1> 	mov	dx, 3D9h
  3708 0000254A A0[255E0000]        <1> 	MOV	AL, [CRT_PALETTE] 	; GET THE CURRENT PALETTE VALUE
  3709 0000254F 08FF                <1> 	OR	BH, BH			; IS THIS COLOR 0?
  3710 00002551 7512                <1> 	JNZ	short M20		; OUTPUT COLOR 1
  3711                              <1> 
  3712                              <1> ;-----	HANDLE COLOR 0 BY SETTING THE BACKGROUND COLOR
  3713                              <1> 
  3714 00002553 24E0                <1> 	AND	AL, 0E0H 		; TURN OFF LOW 5 BITS OF CURRENT
  3715 00002555 80E31F              <1> 	AND	BL, 01FH 		; TURN OFF HIGH 3 BITS OF INPUT VALUE
  3716 00002558 08D8                <1> 	OR	AL, BL			; PUT VALUE INTO REGISTER
  3717                              <1> M19:					; OUTPUT THE PALETTE
  3718 0000255A EE                  <1> 	OUT	DX, AL			; OUTPUT COLOR SELECTION TO 3D9 PORT
  3719 0000255B A2[255E0000]        <1> 	MOV	[CRT_PALETTE], AL 	; SAVE THE COLOR VALUE
  3720 00002560 E9EFEFFFFF          <1> 	JMP	VIDEO_RETURN
  3721                              <1> 
  3722                              <1> ;-----	HANDLE COLOR 1 BY SELECTING THE PALETTE TO BE USED
  3723                              <1> 
  3724                              <1> M20:
  3725 00002565 24DF                <1> 	AND	AL, 0DFH 		; TURN OFF PALETTE SELECT BIT
  3726 00002567 D0EB                <1> 	SHR	BL, 1			; TEST THE LOW ORDER BIT OF BL
  3727 00002569 73EF                <1> 	JNC	short M19		; ALREADY DONE
  3728 0000256B 0C20                <1> 	OR	AL, 20H			; TURN ON PALETTE SELECT BIT
  3729 0000256D EBEB                <1> 	JMP	short M19		; GO DO IT
  3730                              <1> 
  3731                              <1> ; 09/07/2016
  3732                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3733                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3734                              <1> ;--------------------------------------------
  3735                              <1> ; READ DOT -- WRITE DOT
  3736                              <1> ; THESE ROUTINES WILL WRITE A DOT, OR READ THE
  3737                              <1> ;  DOT AT THE INDICATED LOCATION
  3738                              <1> ; ENTRY --
  3739                              <1> ;   DX = ROW (0-199)	(THE ACTUAL VALUE DEPENDS ON THE MODE)
  3740                              <1> ;   CX = COLUMN ( 0-639) ( THE VALUES ARE NOT RANGE CHECKED )
  3741                              <1> ;   AL = DOT VALUE TO WRITE (1,2 OR 4 BITS DEPENDING ON MODE,
  3742                              <1> ;	REQUIRED FOR WRITE DOT ONLY, RIGHT JUSTIFIED)
  3743                              <1> ;	BIT 7 OF AL = 1 INDICATES XOR THE VALUE INTO THE LOCATION
  3744                              <1> ;   DS = DATA SEGMENT
  3745                              <1> ;   ES = REGEN SEGMENT
  3746                              <1> ;
  3747                              <1> ; EXIT
  3748                              <1> ;	AL = DOT VALUE READ, RIGHT JUSTIFIED, READ ONLY
  3749                              <1> ;----------------------------------------------
  3750                              <1> 
  3751                              <1> READ_DOT:
  3752                              <1> 	; 09/07/2016
  3753 0000256F 8A25[225E0000]      <1> 	mov	ah,  [CRT_MODE]
  3754 00002575 80FC07              <1> 	cmp	ah, 7 ; 6!?
  3755 00002578 760A                <1> 	jna	short read_dot_cga
  3756                              <1> 
  3757 0000257A E8CB030000          <1> 	call	vga_read_pixel
  3758                              <1> 	; al = pixel value
  3759 0000257F E9D5EFFFFF          <1> 	jmp	_video_return
  3760                              <1> 
  3761                              <1> read_dot_cga:
  3762                              <1> 	;je	VIDEO_RETURN ; 7	
  3763 00002584 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  3764 00002587 0F82C7EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  3765                              <1> 
  3766 0000258D E855000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF DOT
  3767 00002592 8A06                <1> 	MOV	AL, [eSI]		; GET THE BYTE
  3768 00002594 20E0                <1> 	AND	AL, AH			; MASK OFF THE OTHER BITS IN THE BYTE
  3769 00002596 D2E0                <1> 	SHL	AL, CL			; LEFT JUSTIFY THE VALUE
  3770 00002598 88F1                <1> 	MOV	CL, DH			; GET NUMBER OF BITS IN RESULT
  3771 0000259A D2C0                <1> 	ROL	AL, CL			; RIGHT JUSTIFY THE RESULT
  3772                              <1> 	;JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  3773 0000259C 0FB6C0              <1> 	movzx	eax, al
  3774 0000259F E9B5EFFFFF          <1> 	jmp	_video_return
  3775                              <1> 
  3776                              <1> ; 09/07/2016
  3777                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3778                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3779                              <1> 
  3780                              <1> WRITE_DOT:
  3781                              <1> 	; 09/07/2016
  3782 000025A4 8A25[225E0000]      <1> 	mov	ah, [CRT_MODE]
  3783 000025AA 80FC07              <1> 	cmp	ah, 7 ; 6!?
  3784 000025AD 760A                <1> 	jna	short write_dot_cga
  3785                              <1> 	
  3786 000025AF E805030000          <1> 	call	vga_write_pixel
  3787 000025B4 E99BEFFFFF          <1> 	jmp	VIDEO_RETURN
  3788                              <1> 
  3789                              <1> write_dot_cga:
  3790                              <1> 	;je	VIDEO_RETURN ; 7	
  3791 000025B9 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  3792 000025BC 0F8292EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  3793                              <1> 
  3794                              <1> 	;PUSH	AX			; SAVE DOT VALUE
  3795 000025C2 6650                <1> 	PUSH	AX			; TWICE
  3796 000025C4 E81E000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF THE DOT
  3797 000025C9 D2E8                <1> 	SHR	AL, CL			; SHIFT TO SET UP THE BITS FOR OUTPUT
  3798 000025CB 20E0                <1> 	AND	AL, AH			; STRIP OFF THE OTHER BITS
  3799 000025CD 8A0E                <1> 	MOV	CL, [eSI]		; GET THE CURRENT BYTE
  3800 000025CF 665B                <1> 	POP	BX			; RECOVER XOR FLAG
  3801 000025D1 F6C380              <1> 	TEST	BL, 80H			; IS IT ON
  3802 000025D4 750D                <1> 	JNZ	short R2		; YES, XOR THE DOT
  3803 000025D6 F6D4                <1> 	NOT	AH			; SET MASK TO REMOVE THE INDICATED BITS
  3804 000025D8 20E1                <1> 	AND	CL, AH
  3805 000025DA 08C8                <1> 	OR	AL, CL			; OR IN THE NEW VALUE OF THOSE BITS
  3806                              <1> R1:					; FINISH_DOT
  3807 000025DC 8806                <1> 	MOV	[eSI], AL		; RESTORE THE BYTE IN MEMORY
  3808                              <1> 	;POP	AX
  3809 000025DE E971EFFFFF          <1> 	JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  3810                              <1> R2:					; XOR_DOT
  3811 000025E3 30C8                <1> 	XOR	AL, CL			; EXCLUSIVE OR THE DOTS
  3812 000025E5 EBF5                <1> 	JMP	short R1		; FINISH UP THE WRITING
  3813                              <1> 
  3814                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3815                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3816                              <1> 
  3817                              <1> ;----------------------------------------------
  3818                              <1> ; THIS SUBROUTINE DETERMINES THE REGEN BYTE LOCATION OF THE
  3819                              <1> ; INDICATED ROW COLUMN VALUE IN GRAPHICS MODE.
  3820                              <1> ; ENTRY --
  3821                              <1> ;  DX = ROW VALUE (0-199)
  3822                              <1> ;  CX = COLUMN VALUE (0-639)
  3823                              <1> ; EXIT --
  3824                              <1> ;  SI = OFFSET INTO REGEN BUFFER FOR BYTE OF INTEREST
  3825                              <1> ;  AH = MASK TO STRIP OFF THE BITS OF INTEREST
  3826                              <1> ;  CL = BITS TO SHIFT TO RIGHT JUSTIFY THE MASK IN AH
  3827                              <1> ;  DH = # BITS IN RESULT
  3828                              <1> ;  BX = MODIFIED
  3829                              <1> ;-----------------------------------------------
  3830                              <1> R3:
  3831                              <1> 
  3832                              <1> ;-----	DETERMINE 1ST BYTE IN INDICATED ROW BY MULTIPLYING ROW VALUE BY 40
  3833                              <1> ;-----	 ( LOW BIT OF ROW DETERMINES EVEN/ODD, 80 BYTES/ROW )
  3834                              <1> 
  3835 000025E7 0FB7F0              <1> 	movzx	esi, ax			; WILL SAVE AL AND AH DURING OPERATION
  3836 000025EA B028                <1> 	MOV	AL, 40
  3837 000025EC F6E2                <1> 	MUL	DL			; AX= ADDRESS OF START OF INDICATED ROW
  3838 000025EE A808                <1> 	TEST	AL, 08H 		; TEST FOR EVEN/ODD ROW CALCULATED
  3839 000025F0 7404                <1> 	JZ	short R4		; JUMP IF EVEN ROW
  3840 000025F2 6605D81F            <1> 	ADD	AX, 2000H-40		; OFFSET TO LOCATION OF ODD ROWS ADJUST
  3841                              <1> R4:					; EVEN_ROW
  3842 000025F6 6696                <1> 	XCHG	SI, AX			; MOVE POINTER TO (SI) AND RECOVER (AX)
  3843 000025F8 81C600800B00        <1> 	add	esi, 0B8000h
  3844 000025FE 6689CA              <1> 	MOV	DX, CX			; COLUMN VALUE TO DX
  3845                              <1> 
  3846                              <1> ;-----	DETERMINE GRAPHICS MODE CURRENTLY IN EFFECT
  3847                              <1> 
  3848                              <1> ; SET UP THE REGISTERS ACCORDING TO THE MODE
  3849                              <1> ; CH = MASK FOR LOW OF COLUMN ADDRESS ( 7/3 FOR HIGH/MED RES )
  3850                              <1> ; CL = # OF ADDRESS BITS IN COLUMN VALUE ( 3/2 FOR H/M )
  3851                              <1> ; BL = MASK TO SELECT BITS FROM POINTED BYTE ( 80H/C0H FOR H/M )
  3852                              <1> ; BH = NUMBER OF VALID BITS IN POINTED BYTE ( 1/2 FOR H/M )
  3853                              <1> 
  3854 00002601 66BBC002            <1> 	MOV	BX, 2C0H
  3855 00002605 66B90203            <1> 	MOV	CX, 302H 		; SET PARMS FOR MED RES
  3856 00002609 803D[225E0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3857 00002610 7208                <1> 	JC	short R5		; HANDLE IF MED RES
  3858 00002612 66BB8001            <1> 	MOV	BX, 180H
  3859 00002616 66B90307            <1> 	MOV	CX, 703H 		; SET PARMS FOR HIGH RES
  3860                              <1> 
  3861                              <1> ;-----	DETERMINE BIT OFFSET IN BYTE FROM COLUMN MASK
  3862                              <1> R5:
  3863 0000261A 20D5                <1> 	AND	CH, DL			; ADDRESS OF PEL WITHIN BYTE TO CH
  3864                              <1> 
  3865                              <1> ;-----	DETERMINE BYTE OFFSET FOR THIS LOCATION IN COLUMN
  3866                              <1> 
  3867 0000261C 66D3EA              <1> 	SHR	DX, CL			; SHIFT BY CORRECT AMOUNT
  3868 0000261F 6601D6              <1> 	ADD	SI, DX			; INCREMENT THE POINTER
  3869 00002622 88FE                <1> 	MOV	DH, BH			; GET THE # OF BITS IN RESULT TO DH
  3870                              <1> 
  3871                              <1> ;-----	MULTIPLY BH (VALID BITS IN BYTE) BY CH (BIT OFFSET)
  3872                              <1> 
  3873 00002624 28C9                <1> 	SUB	CL, CL			; ZERO INTO STORAGE LOCATION
  3874                              <1> R6:
  3875 00002626 D0C8                <1> 	ROR	AL, 1			; LEFT JUSTIFY VALUE IN AL (FOR WRITE)
  3876 00002628 00E9                <1> 	ADD	CL, CH			; ADD IN THE BIT OFFSET VALUE
  3877 0000262A FECF                <1> 	DEC	BH			; LOOP CONTROL
  3878 0000262C 75F8                <1> 	JNZ	short R6		; ON EXIT, CL HAS COUNT TO RESTORE BITS
  3879 0000262E 88DC                <1> 	MOV	AH, BL			;  GET MASK TO AH
  3880 00002630 D2EC                <1> 	SHR	AH, CL			;  MOVE THE MASK TO CORRECT LOCATION
  3881 00002632 C3                  <1> 	RETn				;  RETURN WITH EVERYTHING SET UP
  3882                              <1> 
  3883                              <1> load_dac_palette:
  3884                              <1> 	; 29/07/2016
  3885                              <1> 	; 23/07/2016
  3886                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
  3887                              <1> 	; (set_mode_vga)
  3888                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3889                              <1> 	; vgabios-0.7a (2011)
  3890                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3891                              <1> 	; 'vgabios.c', 'load_dac_palette'
  3892                              <1> 	;
  3893                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
  3894                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
  3895                              <1> 	;
  3896                              <1> 	; INPUT -> AH = DAC selection number (3, 2 or 1)
  3897                              <1> 	; OUTPUT -> ECX = 0, AX = 0
  3898                              <1> 	; (Modifed registers: EAX, ECX, EDX, ESI)
  3899                              <1> 	;
  3900 00002633 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  3901 00002637 28C0                <1> 	sub	al, al ; 0
  3902 00002639 EE                  <1> 	out	dx, al ; 0 ; color index, always 0 at the beginning	
  3903 0000263A 6642                <1> 	inc	dx   ; 3C9h ; VGAREG_DAC_DATA
  3904 0000263C B900010000          <1> 	mov	ecx, 256   ; always 256*3 values
  3905                              <1> 	;push	esi
  3906 00002641 88E0                <1> 	mov	al, ah
  3907 00002643 B43F                <1> 	mov	ah, 3Fh	; 3Fh except DAC selection number 3
  3908 00002645 3C02                <1> 	cmp 	al, 2
  3909 00002647 7414                <1> 	je	short l_dac_p_2
  3910 00002649 7719                <1> 	ja	short l_dac_p_3
  3911 0000264B 20C0                <1> 	and	al, al
  3912 0000264D 7507                <1> 	jnz	short l_dac_p_1
  3913                              <1> l_dac_p_0:
  3914 0000264F BE[1C110100]        <1> 	mov	esi, palette0
  3915 00002654 EB15                <1> 	jmp	short l_dac_p_4	
  3916                              <1> l_dac_p_1:
  3917 00002656 BE[DC110100]        <1> 	mov	esi, palette1
  3918 0000265B EB0E                <1> 	jmp	short l_dac_p_4
  3919                              <1> l_dac_p_2:
  3920 0000265D BE[9C120100]        <1> 	mov	esi, palette2
  3921 00002662 EB07                <1> 	jmp	short l_dac_p_4
  3922                              <1> l_dac_p_3:
  3923 00002664 B4FF                <1> 	mov	ah, 0FFh ; dac registers
  3924 00002666 BE[5C130100]        <1> 	mov	esi, palette3
  3925                              <1> l_dac_p_4:
  3926 0000266B AC                  <1> 	lodsb
  3927 0000266C EE                  <1> 	out	dx, al  ; Red
  3928 0000266D AC                  <1> 	lodsb
  3929 0000266E EE                  <1> 	out	dx, al	; Green
  3930 0000266F AC                  <1> 	lodsb
  3931 00002670 EE                  <1> 	out	dx, al	; Blue
  3932 00002671 20E4                <1> 	and	ah, ah
  3933 00002673 7405                <1> 	jz	short l_dac_p_5	
  3934 00002675 FECC                <1> 	dec	ah
  3935 00002677 E2F2                <1> 	loop	l_dac_p_4
  3936                              <1> 	;pop	esi
  3937 00002679 C3                  <1> 	retn
  3938                              <1> l_dac_p_5:
  3939                              <1> 	; 29/07/2016
  3940 0000267A FEC9                <1> 	dec	cl
  3941 0000267C 7407                <1> 	jz	short l_dac_p_7
  3942                              <1> 	;
  3943 0000267E 28C0                <1> 	sub	al, al ; 0
  3944                              <1> l_dac_p_6:
  3945 00002680 EE                  <1> 	out	dx, al ; outb(VGAREG_DAC_DATA,0);
  3946 00002681 EE                  <1> 	out	dx, al
  3947 00002682 EE                  <1> 	out	dx, al
  3948 00002683 E2FB                <1> 	loop	l_dac_p_6
  3949                              <1> l_dac_p_7:
  3950                              <1> 	;pop	esi
  3951 00002685 C3                  <1> 	retn
  3952                              <1> 
  3953                              <1> gray_scale_summing:
  3954                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
  3955                              <1> 	; (set_mode_vga)
  3956                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3957                              <1> 	; vgabios-0.7a (2011)
  3958                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3959                              <1> 	; 'vgabios.c', 'biosfn_perform_gray_scale_summing'
  3960                              <1> 	;
  3961                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
  3962                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
  3963                              <1> 	;
  3964                              <1> 
  3965                              <1> 	; INPUT -> EBX = Start address (color index <= 255)
  3966                              <1> 	;	   ECX = Count (<= 256)
  3967                              <1> 	; OUTPUT -> (E)CX = 0
  3968                              <1> 	; (Modifed registers: EAX, ECX, EDX, EBX)
  3969                              <1> 
  3970 00002686 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  3971 0000268A EC                  <1> 	in	al, dx
  3972 0000268B 30C0                <1> 	xor	al, al ; 0
  3973 0000268D 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  3974 00002691 EE                  <1> 	out	dx, al	; clear bit 5
  3975                              <1> 			; (while loading palette registers)
  3976                              <1> 	; set read address and switch to read mode
  3977                              <1> g_s_s_1:
  3978 00002692 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  3979 00002696 88D8                <1> 	mov	al, bl
  3980 00002698 EE                  <1> 	out	dx, al
  3981                              <1> 	; get 6-bit wide RGB data values
  3982                              <1>  	; intensity = (0.3*Red)+(0.59*Green)+(0.11*Blue)
  3983                              <1> 	; i = ( ( 77*r + 151*g + 28*b ) + 0x80 ) >> 8;
  3984 00002699 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  3985 0000269D EC                  <1> 	in	al, dx ; red
  3986 0000269E B44D                <1> 	mov	ah, 77 ; 0.3* Red
  3987 000026A0 F6E4                <1> 	mul	ah
  3988 000026A2 6650                <1> 	push	ax
  3989 000026A4 EC                  <1> 	in	al, dx ; green
  3990 000026A5 B497                <1> 	mov	ah, 151  ; 0.59 * Green
  3991 000026A7 F6E4                <1> 	mul	ah
  3992 000026A9 6650                <1> 	push	ax
  3993 000026AB EC                  <1> 	in	al, dx ; blue
  3994 000026AC B41C                <1> 	mov	ah, 28 ; 0.11 * Blue
  3995 000026AE F6E4                <1> 	mul	ah
  3996 000026B0 665A                <1> 	pop	dx
  3997 000026B2 6601D0              <1> 	add	ax, dx
  3998 000026B5 665A                <1> 	pop	dx
  3999 000026B7 6601D0              <1> 	add	ax, dx
  4000 000026BA 66058000            <1> 	add	ax, 80h  
  4001 000026BE B03F                <1> 	mov	al, 3Fh
  4002 000026C0 38C4                <1> 	cmp	ah, al
  4003 000026C2 7602                <1> 	jna	short g_s_s_2
  4004 000026C4 88C4                <1> 	mov	ah, al
  4005                              <1> g_s_s_2:
  4006 000026C6 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  4007 000026CA 88D8                <1> 	mov	al, bl ; color index
  4008 000026CC EE                  <1> 	out	dx, al
  4009 000026CD 88E0                <1> 	mov	al, ah ; intensity
  4010 000026CF 6642                <1> 	inc	dx ; 3C9h ; VGAREG_DAC_DATA
  4011 000026D1 EE                  <1> 	out	dx, al ; R (R=G=B)
  4012 000026D2 88E0                <1> 	mov	al, ah ; intensity
  4013 000026D4 EE                  <1> 	out	dx, al ; G (R=G=B)
  4014 000026D5 88E0                <1>  	mov	al, ah ; intensity
  4015 000026D7 EE                  <1> 	out	dx, al ; B (R=G=B)
  4016 000026D8 6649                <1> 	dec	cx
  4017 000026DA 7404                <1> 	jz	short g_s_s_3
  4018 000026DC FEC3                <1> 	inc	bl    ; next color index value
  4019 000026DE EBB2                <1> 	jmp	short g_s_s_1
  4020                              <1> g_s_s_3:
  4021 000026E0 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  4022 000026E4 EC                  <1> 	in	al, dx
  4023 000026E5 B020                <1> 	mov	al, 20h
  4024 000026E7 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  4025 000026EB EE                  <1> 	out	dx, al ; 20h -> set bit 5
  4026                              <1> 		        ; (after loading palette regs)	
  4027 000026EC C3                  <1> 	retn
  4028                              <1> 
  4029                              <1> vga_write_char_attr:
  4030                              <1> vga_write_char_only: 
  4031                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  4032                              <1> 	;
  4033                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4034                              <1> 	; vgabios-0.7a (2011)
  4035                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4036                              <1> 	; 'vgabios.c', 'biosfn_write_char_attr'
  4037                              <1> 	; 'biosfn_write_char_only'
  4038                              <1> 
  4039                              <1> 	; INPUT ->
  4040                              <1> 	; [CRT_MODE] = current video mode (>7)
  4041                              <1> 	; CX = Count of characters to write
  4042                              <1> 	; AL = Character to write
  4043                              <1> 	; BL = Color of character
  4044                              <1> 	; OUTPUT ->
  4045                              <1> 	; Regen buffer updated
  4046                              <1>  
  4047 000026ED 8A25[225E0000]      <1> 	mov 	ah, [CRT_MODE]
  4048 000026F3 668B15[FE410100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  4049                              <1> 
  4050 000026FA BE[3E5E0000]        <1> 	mov	esi, vga_modes
  4051 000026FF 89F7                <1> 	mov	edi, esi
  4052 00002701 83C710              <1> 	add	edi, vga_mode_count
  4053                              <1> vga_wca_0:
  4054 00002704 AC                  <1> 	lodsb
  4055 00002705 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4056 00002707 7405                <1> 	je	short vga_wca_2
  4057 00002709 39FE                <1> 	cmp	esi, edi
  4058 0000270B 72F7                <1> 	jb	short vga_wca_0
  4059                              <1> vga_wca_1:
  4060 0000270D C3                  <1> 	retn	; nothing to do
  4061                              <1> vga_wca_2:
  4062 0000270E 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4063                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4064                              <1> 
  4065                              <1> 	; biosfn_write_char_attr (car,page,attr,count) 
  4066                              <1> 	; AL = car, page = 0, BL = attr, CX = count
  4067 00002711 803E04              <1> 	cmp	byte [esi], PLANAR4
  4068 00002714 741D                <1> 	je	short vga_wca_planar
  4069 00002716 803E03              <1> 	cmp	byte [esi], PLANAR1
  4070 00002719 7418                <1> 	je	short vga_wca_planar
  4071                              <1> vga_wca_linear8:
  4072                              <1> 	; while((count-->0) && (xcurs<nbcols))
  4073                              <1> 	; CX = count
  4074 0000271B 6621C9              <1> 	and	cx, cx
  4075 0000271E 74ED                <1> 	jz	short vga_wca_1
  4076 00002720 3A15[245E0000]      <1> 	cmp	dl, [CRT_COLS]
  4077 00002726 73E5                <1> 	jnb	short vga_wca_1
  4078                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
  4079                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4080                              <1> 	; [CRT_COLS] = nbcols
  4081 00002728 E81E000000          <1> 	call	write_gfx_char_lin	 
  4082 0000272D 6649                <1> 	dec	cx ; count
  4083 0000272F FEC2                <1> 	inc	dl ; xcurs
  4084 00002731 EBE8                <1> 	jmp	short vga_wca_linear8
  4085                              <1> vga_wca_planar:
  4086                              <1> 	; while((count-->0) && (xcurs<nbcols))
  4087                              <1> 	; CX = count
  4088 00002733 6621C9              <1> 	and	cx, cx
  4089 00002736 74D5                <1> 	jz	short vga_wca_1
  4090 00002738 3A15[245E0000]      <1> 	cmp	dl, [CRT_COLS]
  4091 0000273E 73CD                <1> 	jnb	short vga_wca_1
  4092                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
  4093                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4094                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  4095 00002740 E89D000000          <1> 	call	write_gfx_char_pl4
  4096 00002745 6649                <1> 	dec	cx ; count
  4097 00002747 FEC2                <1> 	inc	dl ; xcurs
  4098 00002749 EBE8                <1> 	jmp	short vga_wca_planar
  4099                              <1> 
  4100                              <1> write_gfx_char_lin:
  4101                              <1> 	; 08/08/2016
  4102                              <1> 	; 31/07/2016
  4103                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  4104                              <1> 	;
  4105                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4106                              <1> 	; vgabios-0.7a (2011)
  4107                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4108                              <1> 	; 'vgabios.c', 'write_gfx_char_lin'
  4109                              <1> 
  4110                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols)
  4111                              <1> 	; INPUT ->
  4112                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4113                              <1> 	; [CRT_COLS] = nbcols
  4114                              <1> 	; OUTPUT ->
  4115                              <1> 	; Regen buffer updated
  4116                              <1> 
  4117 0000274B 51                  <1> 	push	ecx
  4118 0000274C 53                  <1> 	push	ebx
  4119 0000274D 52                  <1> 	push	edx
  4120 0000274E 50                  <1> 	push	eax
  4121                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  4122                              <1> 	; 08/08/2016
  4123 0000274F 0FB6F0              <1> 	movzx	esi, al ; car
  4124 00002752 0FB6C6              <1> 	movzx	eax, dh ; ycurs
  4125 00002755 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4126 0000275B F6E4                <1> 	mul	ah
  4127                              <1> 	;shl	ax, 6 ; * 64
  4128 0000275D 66C1E003            <1>  	shl	ax, 3 ; * 8
  4129                              <1> 	;sub	dh, dh
  4130                              <1> 	;shl	dx, 3 ; xcurs * 8
  4131                              <1> 	;movzx	edi, dx
  4132 00002761 0FB6FA              <1> 	movzx	edi, dl
  4133 00002764 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  4134 00002768 30F6                <1> 	xor	dh, dh
  4135 0000276A 8A15[265E0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  4136 00002770 66F7E2              <1> 	mul	dx
  4137                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  4138 00002773 01C7                <1> 	add	edi, eax ; addr
  4139 00002775 81C700000A00        <1> 	add	edi, 0A0000h
  4140                              <1> 	;shl	si, 3 ; car * 8
  4141 0000277B 30E4                <1> 	xor	ah, ah
  4142 0000277D A0[265E0000]        <1> 	mov	al, [CHAR_HEIGHT]
  4143 00002782 66F7E6              <1> 	mul	si
  4144 00002785 6689C6              <1> 	mov	si, ax
  4145                              <1> 	;; esi = src = car * 8
  4146                              <1> 	; esi = src = car * [CHAR_HEIGHT]
  4147                              <1> 	; i = 0
  4148                              <1> 	;add	esi, vgafont8 ; fdata [src+i]
  4149                              <1> 	; 08/08/2016
  4150 00002788 A1[8E4F0100]        <1> 	mov	eax, [VGA_INT43H]
  4151 0000278D 3D[5C2C0100]        <1> 	cmp	eax, vgafont16
  4152 00002792 740F                <1>         je      short wgfxl_0
  4153 00002794 3D[5C1E0100]        <1> 	cmp	eax, vgafont14
  4154 00002799 7408                <1> 	je	short wgfxl_0
  4155 0000279B 81C6[5C160100]      <1> 	add	esi, vgafont8
  4156 000027A1 EB02                <1> 	jmp	short wgfxl_1
  4157                              <1> wgfxl_0:
  4158 000027A3 01C6                <1> 	add	esi, eax
  4159                              <1> wgfxl_1:
  4160 000027A5 28FF                <1> 	sub	bh, bh ; i = 0
  4161                              <1> wgfxl_2:
  4162                              <1> 	; for(i=0;i<8;i++)
  4163 000027A7 57                  <1> 	push	edi ; addr
  4164 000027A8 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  4165 000027AF F6E7                <1> 	mul	bh ; nbcols*i
  4166 000027B1 66C1E003            <1> 	shl	ax, 3 ; i*nbcols*8
  4167                              <1>  	; dest=addr+i*nbcols*8;
  4168 000027B5 01C7                <1> 	add	edi, eax ; dest + j ; j = 0
  4169 000027B7 B180                <1> 	mov	cl, 80h ; mask = 0x80;
  4170                              <1> 	; esi = fdata + src + i
  4171                              <1> 	; for(j=0;j<8;j++)
  4172 000027B9 29D2                <1> 	sub	edx, edx ; j = 0
  4173                              <1> wgfxl_3:
  4174 000027BB 8A06                <1> 	mov	al, [esi] ; al = fdata[src+i]
  4175 000027BD 20C8                <1> 	and	al, cl ; if (fdata[src+i] & mask)
  4176 000027BF 7402                <1> 	jz	short wgfxl_4  ; data = 0, zf = 1
  4177 000027C1 88D8                <1> 	mov	al, bl ; data = attr;
  4178                              <1> wgfxl_4:
  4179                              <1> 	; write_byte(0xa000,dest+j,data);		
  4180 000027C3 AA                  <1> 	stosb  ; dest + j (+ 0A0000h)
  4181                              <1> 	;inc	dl ; j++
  4182                              <1> 	;cmp	dl, 8
  4183 000027C4 80FA07              <1> 	cmp	dl, 7
  4184 000027C7 720E                <1> 	jb	short wgfxl_5
  4185 000027C9 5F                  <1> 	pop	edi
  4186                              <1> 	; 08/08/2016
  4187                              <1> 	;cmp	bh, 7
  4188                              <1> 	;jnb	short wgfxl_6
  4189 000027CA FEC7                <1> 	inc	bh ; i++
  4190 000027CC 3A3D[265E0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  4191 000027D2 7309                <1> 	jnb	short wgfxl_6
  4192 000027D4 46                  <1> 	inc	esi
  4193 000027D5 EBD0                <1> 	jmp	short wgfxl_2
  4194                              <1> wgfxl_5:
  4195 000027D7 D0E9                <1> 	shr	cl, 1 ; mask >>= 1;
  4196 000027D9 FEC2                <1> 	inc	dl ; j++
  4197 000027DB EBDE                <1>         jmp     short wgfxl_3
  4198                              <1> wgfxl_6:
  4199 000027DD 58                  <1> 	pop	eax
  4200 000027DE 5A                  <1> 	pop	edx
  4201 000027DF 5B                  <1> 	pop	ebx
  4202 000027E0 59                  <1> 	pop	ecx
  4203 000027E1 C3                  <1> 	retn
  4204                              <1> 
  4205                              <1> write_gfx_char_pl4:
  4206                              <1> 	; 08/08/2016
  4207                              <1> 	; 08/07/2016 (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', 'write_gfx_char_pl4'
  4213                              <1> 
  4214                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight)
  4215                              <1> 	; INPUT ->
  4216                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4217                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  4218                              <1> 	; OUTPUT ->
  4219                              <1> 	; Regen buffer updated
  4220                              <1> 
  4221 000027E2 51                  <1> 	push	ecx
  4222 000027E3 53                  <1> 	push	ebx
  4223 000027E4 52                  <1> 	push	edx
  4224 000027E5 50                  <1> 	push	eax
  4225                              <1> wgfxpl_f0:
  4226                              <1> 	; switch(cheight)
  4227 000027E6 8A25[265E0000]      <1> 	mov	ah, [CHAR_HEIGHT]
  4228 000027EC 80FC10              <1> 	cmp	ah, 16 ; case 16:
  4229 000027EF 7507                <1> 	jne	short wgfxpl_f1
  4230                              <1> 	; fdata = &vgafont16;
  4231 000027F1 BE[5C2C0100]        <1> 	mov	esi, vgafont16
  4232 000027F6 EB13                <1> 	jmp	short wgfxpl_f3
  4233                              <1> wgfxpl_f1:
  4234 000027F8 80FC0E              <1> 	cmp	ah, 14 ; case 14:
  4235 000027FB 7507                <1> 	jne	short wgfxpl_f2
  4236 000027FD BE[5C1E0100]        <1> 	mov	esi, vgafont14
  4237 00002802 EB07                <1> 	jmp	short wgfxpl_f3
  4238                              <1> wgfxpl_f2:
  4239                              <1> 	; default:
  4240                              <1> 	;  fdata = &vgafont8;
  4241 00002804 BE[5C160100]        <1> 	mov	esi, vgafont8
  4242 00002809 B408                <1> 	mov	ah, 8	
  4243                              <1> wgfxpl_f3:
  4244                              <1> 	; al = car
  4245 0000280B F6E4                <1> 	mul	ah ; ah = cheight
  4246 0000280D 25FFFF0000          <1> 	and	eax, 0FFFFh ; car * cheight
  4247                              <1> 	; src = car * cheight;
  4248 00002812 01C6                <1> 	add	esi, eax ; esi = fdata[src+i]
  4249                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  4250 00002814 88F0                <1> 	mov	al, dh ; ycurs
  4251 00002816 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4252 0000281C F6E4                <1> 	mul	ah
  4253                              <1> 	; 08/08/2016
  4254                              <1> 	;shl	ax, 6 ; * 64
  4255 0000281E 66C1E003            <1> 	shl	ax, 3 ; * 8
  4256                              <1> 	;sub	dh, dh ; 0
  4257                              <1> 	;shl	dx, 3 ; xcurs * 8
  4258                              <1> 	;movzx	edi, dx
  4259 00002822 0FB6FA              <1> 	movzx	edi, dl
  4260 00002825 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  4261 00002829 30F6                <1> 	xor	dh, dh
  4262 0000282B 8A15[265E0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  4263 00002831 66F7E2              <1> 	mul	dx
  4264                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  4265 00002834 01C7                <1> 	add	edi, eax ; addr
  4266 00002836 81C700000A00        <1> 	add	edi, 0A0000h
  4267                              <1> 	;
  4268                              <1> 	; outw(VGAREG_SEQU_ADDRESS, 0x0f02);
  4269                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  4270 0000283C 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4271 00002840 66B8020F            <1> 	mov	ax, 0F02h
  4272 00002844 66EF                <1> 	out	dx, ax
  4273 00002846 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4274 0000284A 66B80502            <1> 	mov	ax, 0205h
  4275 0000284E 66EF                <1> 	out	dx, ax
  4276                              <1> 	;
  4277 00002850 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4278 00002854 F6C380              <1> 	test	bl, 80h ; if(attr&0x80)
  4279 00002857 7406                <1> 	jz	short wgfxpl_f4 ; else
  4280                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x1803);
  4281 00002859 66B80318            <1> 	mov	ax, 1803h
  4282 0000285D EB04                <1> 	jmp	short wgfxpl_f5
  4283                              <1> wgfxpl_f4:
  4284                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0003);
  4285 0000285F 66B80300            <1> 	mov	ax, 0003h	
  4286                              <1> wgfxpl_f5:
  4287 00002863 66EF                <1> 	out	dx, ax
  4288                              <1> 	;	
  4289 00002865 28FF                <1> 	sub	bh, bh ; i = 0
  4290                              <1> wgfxpl_0:
  4291                              <1> 	; for(i=0;i<cheight;i++)
  4292 00002867 57                  <1> 	push	edi ; addr
  4293 00002868 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  4294 0000286F F6E7                <1> 	mul	bh ; nbcols*i
  4295                              <1> 	; dest=addr+i*nbcols
  4296 00002871 01C7                <1> 	add	edi, eax ; dest
  4297 00002873 B580                <1> 	mov	ch, 80h ; mask = 0x80;
  4298                              <1> 	; for(j=0;j<8;j++)
  4299 00002875 28C9                <1> 	sub	cl, cl ; j = 0
  4300                              <1> wgfxpl_1:
  4301 00002877 D2ED                <1> 	shr	ch, cl ; mask=0x80>>j;
  4302                              <1> 	;
  4303                              <1> 	; outw(VGAREG_GRDC_ADDRESS, (mask << 8) | 0x08);
  4304                              <1>      	; read_byte(0xa000,dest);
  4305                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4306 00002879 88EC                <1> 	mov	ah, ch
  4307 0000287B B008                <1> 	mov	al, 8
  4308 0000287D 66EF                <1> 	out	dx, ax
  4309 0000287F 8A07                <1> 	mov	al, [edi] ; ? (io delay?)
  4310                              <1> 	;
  4311 00002881 28C0                <1> 	sub	al, al ; attr = 0
  4312                              <1> 	; if (fdata[src+i] & mask)
  4313 00002883 842E                <1> 	test	byte [esi], ch
  4314 00002885 7404                <1> 	jz	short wgfxpl_2  ; zf = 1
  4315                              <1> 	; write_byte(0xa000,dest,attr&0x0f);
  4316 00002887 88D8                <1> 	mov	al, bl ; attr;
  4317 00002889 240F                <1> 	and	al, 0Fh	; attr&0x0f
  4318                              <1> wgfxpl_2:
  4319                              <1> 	; write_byte(0xa000,dest,0x00);		
  4320 0000288B 8807                <1> 	mov	[edi], al ; dest (+ 0A0000h)
  4321 0000288D FEC1                <1> 	inc	cl ; j++
  4322 0000288F 80F908              <1> 	cmp	cl, 8
  4323 00002892 72E3                <1> 	jb	short wgfxpl_1
  4324 00002894 5F                  <1> 	pop	edi
  4325                              <1> 	; 08/08/2016
  4326                              <1> 	;cmp	bh, 7
  4327                              <1> 	;jnb	short wgfxpl_3
  4328 00002895 FEC7                <1> 	inc	bh ; i++
  4329 00002897 3A3D[265E0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  4330 0000289D 7303                <1> 	jnb	short wgfxpl_3
  4331 0000289F 46                  <1> 	inc	esi
  4332 000028A0 EBC5                <1> 	jmp	short wgfxpl_0
  4333                              <1> wgfxpl_3:
  4334                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4335 000028A2 66B808FF            <1>   	mov	ax, 0FF08h
  4336 000028A6 66EF                <1> 	out	dx, ax
  4337 000028A8 66B80500            <1> 	mov	ax, 0005h
  4338 000028AC 66EF                <1> 	out	dx, ax
  4339 000028AE 66B80300            <1> 	mov	ax, 0003h
  4340 000028B2 66EF                <1> 	out	dx, ax
  4341                              <1> 	;
  4342 000028B4 58                  <1> 	pop	eax
  4343 000028B5 5A                  <1> 	pop	edx
  4344 000028B6 5B                  <1> 	pop	ebx
  4345 000028B7 59                  <1> 	pop	ecx
  4346 000028B8 C3                  <1> 	retn
  4347                              <1> 
  4348                              <1> vga_write_pixel: 
  4349                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  4350                              <1> 	;
  4351                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4352                              <1> 	; vgabios-0.7a (2011)
  4353                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4354                              <1> 	; 'vgabios.c', 'biosfn_write_pixel'
  4355                              <1> 
  4356                              <1> 	; INPUT ->
  4357                              <1> 	; 	DX = row (0-239)
  4358                              <1> 	; 	CX = column (0-799)
  4359                              <1> 	; 	AL = pixel value
  4360                              <1> 	;	(AH = [CRT_MODE])
  4361                              <1> 	; OUTPUT ->
  4362                              <1> 	; 	none
  4363                              <1>  
  4364 000028B9 88C3                <1> 	mov	bl, al ; pixel value
  4365                              <1> 	;mov 	ah, [CRT_MODE]
  4366 000028BB BE[3E5E0000]        <1> 	mov	esi, vga_modes
  4367 000028C0 89F7                <1> 	mov	edi, esi
  4368 000028C2 83C710              <1> 	add	edi, vga_mode_count
  4369                              <1> vga_wp_0:
  4370 000028C5 AC                  <1> 	lodsb
  4371 000028C6 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4372 000028C8 7405                <1> 	je	short vga_wp_1
  4373 000028CA 39FE                <1> 	cmp	esi, edi
  4374 000028CC 72F7                <1> 	jb	short vga_wp_0
  4375 000028CE C3                  <1> 	retn	; nothing to do
  4376                              <1> vga_wp_1:
  4377 000028CF 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4378                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4379 000028D2 BF00000A00          <1> 	mov	edi, 0A0000h
  4380                              <1> 	;
  4381 000028D7 803E04              <1> 	cmp	byte [esi], PLANAR4
  4382 000028DA 741D                <1> 	je	short vga_wp_planar
  4383 000028DC 803E03              <1> 	cmp	byte [esi], PLANAR1
  4384 000028DF 7418                <1> 	je	short vga_wp_planar
  4385                              <1> vga_wp_linear8:
  4386                              <1> 	; addr=CX+DX*(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
  4387 000028E1 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4388 000028E8 66C1E003            <1>      	shl	ax, 3 ; * 8
  4389 000028EC 66F7E2              <1> 	mul	dx
  4390 000028EF 50                  <1> 	push	eax
  4391                              <1> 	;mov	edi, 0A0000h
  4392 000028F0 6601CF              <1> 	add	di, cx
  4393 000028F3 58                  <1> 	pop	eax
  4394 000028F4 01C7                <1> 	add	edi, eax ; addr
  4395                              <1> 	; write_byte(0xa000,addr,AL);
  4396 000028F6 881F                <1> 	mov	[edi], bl
  4397 000028F8 C3                  <1> 	retn    
  4398                              <1> vga_wp_planar:
  4399                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  4400 000028F9 0FB7C1              <1> 	movzx	eax, cx
  4401 000028FC 66C1E803            <1> 	shr	ax, 3 ; CX/8
  4402 00002900 50                  <1> 	push	eax
  4403 00002901 28E4                <1> 	sub	ah, ah ; 0
  4404 00002903 A0[245E0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4405 00002908 66F7E2              <1> 	mul	dx
  4406                              <1> 	;mov	edi, 0A0000h
  4407 0000290B 6601C7              <1>         add     di, ax
  4408 0000290E 58                  <1> 	pop	eax
  4409 0000290F 01C7                <1> 	add	edi, eax ; addr
  4410 00002911 80E107              <1> 	and	cl, 7
  4411 00002914 B580                <1> 	mov	ch, 80h ; mask
  4412 00002916 D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  4413                              <1> 	
  4414                              <1> 	; outw(VGAREG_GRDC_ADDRESS, (mask << 8) | 0x08);
  4415 00002918 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4416 0000291C 88EC                <1> 	mov	ah, ch
  4417 0000291E B008                <1> 	mov	al, 8
  4418 00002920 66EF                <1> 	out	dx, ax
  4419                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  4420 00002922 66B80502            <1> 	mov	ax, 0205h
  4421 00002926 66EF                <1> 	out	dx, ax
  4422                              <1> 	; data = read_byte(0xa000,addr);
  4423 00002928 8A07                <1> 	mov	al, [edi] ; (delay?)	
  4424                              <1> 	; if (AL & 0x80)
  4425                              <1> 	; {
  4426                              <1> 	;  outw(VGAREG_GRDC_ADDRESS, 0x1803);
  4427                              <1> 	; }
  4428 0000292A F6C380              <1> 	test	bl, 80h
  4429 0000292D 7406                <1> 	jz	short vga_wp_2
  4430 0000292F 66B80318            <1> 	mov	ax, 1803h
  4431 00002933 66EF                <1> 	out	dx, ax
  4432                              <1> vga_wp_2:	
  4433                              <1> 	; write_byte(0xa000,addr,AL);
  4434 00002935 881F                <1> 	mov	[edi], bl
  4435                              <1> 	;
  4436                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4437 00002937 66B808FF            <1>   	mov	ax, 0FF08h
  4438 0000293B 66EF                <1> 	out	dx, ax
  4439 0000293D 66B80500            <1> 	mov	ax, 0005h
  4440 00002941 66EF                <1> 	out	dx, ax
  4441 00002943 66B80300            <1> 	mov	ax, 0003h
  4442 00002947 66EF                <1> 	out	dx, ax
  4443                              <1> 	;
  4444 00002949 C3                  <1> 	retn
  4445                              <1> 
  4446                              <1> vga_read_pixel: 
  4447                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  4448                              <1> 	;
  4449                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4450                              <1> 	; vgabios-0.7a (2011)
  4451                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4452                              <1> 	; 'vgabios.c', 'biosfn_read_pixel'
  4453                              <1> 
  4454                              <1> 	; INPUT ->
  4455                              <1> 	; 	DX = row (0-239)
  4456                              <1> 	; 	CX = column (0-799)
  4457                              <1> 	;	(AH = [CRT_MODE])
  4458                              <1> 	; OUTPUT ->
  4459                              <1> 	; 	AL = pixel value
  4460                              <1> 	 
  4461                              <1> 	;mov 	ah, [CRT_MODE]
  4462 0000294A BE[3E5E0000]        <1> 	mov	esi, vga_modes
  4463 0000294F 89F7                <1> 	mov	edi, esi
  4464 00002951 83C710              <1> 	add	edi, vga_mode_count
  4465                              <1> vga_rp_0:
  4466 00002954 AC                  <1> 	lodsb
  4467 00002955 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4468 00002957 7405                <1> 	je	short vga_rp_1
  4469 00002959 39FE                <1> 	cmp	esi, edi
  4470 0000295B 72F7                <1> 	jb	short vga_rp_0
  4471 0000295D C3                  <1> 	retn	; nothing to do
  4472                              <1> vga_rp_1:
  4473 0000295E 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4474                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4475 00002961 BF00000A00          <1> 	mov	edi, 0A0000h
  4476                              <1> 	;
  4477 00002966 803E04              <1> 	cmp	byte [esi], PLANAR4
  4478 00002969 741D                <1> 	je	short vga_rp_planar
  4479 0000296B 803E03              <1> 	cmp	byte [esi], PLANAR1
  4480 0000296E 7418                <1> 	je	short vga_rp_planar
  4481                              <1> vga_rp_linear8:
  4482                              <1> 	; addr=CX+DX*(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
  4483 00002970 0FB605[245E0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4484 00002977 66C1E003            <1>      	shl	ax, 3 ; * 8
  4485 0000297B 66F7E2              <1> 	mul	dx
  4486 0000297E 50                  <1> 	push	eax
  4487                              <1> 	;mov	edi, 0A0000h
  4488 0000297F 6601CF              <1> 	add	di, cx
  4489 00002982 58                  <1> 	pop	eax
  4490 00002983 01C7                <1> 	add	edi, eax ; addr
  4491                              <1> 	; attr=read_byte(0xa000,addr);
  4492 00002985 8A07                <1> 	mov	al, [edi] ; pixel value
  4493 00002987 C3                  <1> 	retn    
  4494                              <1> vga_rp_planar:
  4495                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  4496 00002988 0FB7C1              <1> 	movzx	eax, cx
  4497 0000298B 66C1E803            <1> 	shr	ax, 3 ; CX/8
  4498 0000298F 50                  <1> 	push	eax
  4499 00002990 28E4                <1> 	sub	ah, ah ; 0
  4500 00002992 A0[245E0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4501 00002997 66F7E2              <1> 	mul	dx
  4502                              <1> 	;mov	edi, 0A0000h
  4503 0000299A 6601C7              <1>         add     di, ax
  4504 0000299D 58                  <1> 	pop	eax
  4505 0000299E 01C7                <1> 	add	edi, eax ; addr
  4506 000029A0 80E107              <1> 	and	cl, 7
  4507 000029A3 B580                <1> 	mov	ch, 80h ; mask
  4508 000029A5 D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  4509                              <1> 	; attr = 0x00;
  4510 000029A7 30DB                <1> 	xor	bl, bl ; attr = bl = 0, 
  4511 000029A9 30C9                <1> 	xor	cl, cl ; i = cl = 0
  4512                              <1> 	; for(i=0;i<4;i++)
  4513                              <1>       	; {
  4514                              <1>        	;  outw(VGAREG_GRDC_ADDRESS, (i << 8) | 0x04);
  4515                              <1>        	;  data = read_byte(0xa000,addr) & mask;
  4516                              <1>        	;  if (data > 0) attr |= (0x01 << i);
  4517                              <1>       	; }
  4518                              <1> vga_rp_2:
  4519 000029AB 88CC                <1> 	mov	ah, cl ; i << 8
  4520 000029AD B004                <1> 	mov	al, 4  ; | 0x04
  4521 000029AF 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4522 000029B3 66EF                <1> 	out	dx, ax
  4523                              <1> 	; data = read_byte(0xa000,addr) & mask;
  4524 000029B5 8A07                <1> 	mov	al, [edi]
  4525 000029B7 20E8                <1> 	and	al, ch ; & mask
  4526                              <1> 	; if (data > 0) attr |= (0x01 << i);
  4527 000029B9 08C0                <1> 	or	al, al
  4528 000029BB 7408                <1> 	jz	short vga_rp_3 ; al = 0 
  4529 000029BD B701                <1> 	mov	bh, 1
  4530 000029BF D2E7                <1> 	shl	bh, cl ; (0x01 << i)
  4531 000029C1 08FB                <1> 	or	bl, bh ; attr |= (0x01 << i)
  4532 000029C3 88D8                <1> 	mov	al, bl ; pixel value	
  4533                              <1> vga_rp_3:	
  4534 000029C5 C3                  <1> 	retn
  4535                              <1> 
  4536                              <1> vga_beeper:
  4537                              <1> 	; 04/08/2016  (TRDOS 386 = TRDOS v2.0)
  4538 000029C6 FB                  <1> 	sti
  4539                              <1> 	;mov	bh, [ACTIVE_PAGE]
  4540 000029C7 E9CFF3FFFF          <1>         jmp     beeper_gfx
  4541                              <1> 
  4542                              <1> vga_write_teletype:
  4543                              <1> 	; 06/08/2016
  4544                              <1> 	; 04/08/2016
  4545                              <1> 	; 01/08/2016
  4546                              <1> 	; 31/07/2016
  4547                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  4548                              <1> 	;
  4549                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4550                              <1> 	; vgabios-0.7a (2011)
  4551                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4552                              <1> 	; 'vgabios.c', 'biosfn_write_teletype'
  4553                              <1> 	; 'biosfn_write_char_only'
  4554                              <1> 
  4555                              <1> 	; INPUT ->
  4556                              <1> 	; [CRT_MODE] = current video mode (>7)
  4557                              <1> 	; AL = Character to write
  4558                              <1> 	; BL = Color of character
  4559                              <1> 	; OUTPUT ->
  4560                              <1> 	; Regen buffer updated
  4561                              <1> 
  4562                              <1> 	; biosfn_write_teletype (car, page, attr, flag) 
  4563                              <1> 	; car = character (AL)
  4564                              <1> 	; page = 0
  4565                              <1> 	; attr = color (BL)
  4566                              <1> 	; 'flag' not used
  4567                              <1> 
  4568 000029CC 8A25[225E0000]      <1> 	mov 	ah, [CRT_MODE]
  4569 000029D2 88C7                <1> 	mov	bh, al ; character
  4570 000029D4 668B15[FE410100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  4571                              <1> 
  4572 000029DB BE[465E0000]        <1> 	mov	esi, vga_g_modes
  4573 000029E0 89F7                <1> 	mov	edi, esi
  4574 000029E2 83C708              <1> 	add	edi, vga_g_mode_count
  4575                              <1> vga_wtty_0:
  4576 000029E5 AC                  <1> 	lodsb
  4577 000029E6 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4578 000029E8 7405                <1> 	je	short vga_wtty_2
  4579 000029EA 39FE                <1> 	cmp	esi, edi
  4580 000029EC 72F7                <1> 	jb	short vga_wtty_0
  4581                              <1> vga_wtty_1:
  4582 000029EE C3                  <1> 	retn	; nothing to do
  4583                              <1> vga_wtty_2:
  4584 000029EF 80FF07              <1> 	cmp	bh, 07h ; bell (beep)
  4585 000029F2 74D2                <1> 	je	short vga_beeper  ; u11
  4586 000029F4 80FF08              <1> 	cmp	bh, 08h ; backspace
  4587 000029F7 7508                <1> 	jne	short vga_wtty_3
  4588                              <1> 	; if(xcurs>0)xcurs--;
  4589 000029F9 08D2                <1> 	or	dl, dl ; xcurs (column)
  4590 000029FB 74F1                <1> 	jz	short vga_wtty_1
  4591 000029FD FECA                <1> 	dec	dl ; xcurs--;
  4592 000029FF EB59                <1>         jmp     short vga_wtty_12 
  4593                              <1> vga_wtty_3:			
  4594 00002A01 80FF0D              <1> 	cmp	bh, 0Dh ; carriage return (\r)
  4595 00002A04 7504                <1> 	jne	short vga_wtty_4
  4596                              <1> 	; xcurs=0;
  4597 00002A06 28D2                <1> 	sub	dl, dl ; 0
  4598 00002A08 EB50                <1>         jmp     short vga_wtty_12 
  4599                              <1> vga_wtty_4:	
  4600 00002A0A 80FF0A              <1> 	cmp	bh, 0Ah ; new line (\n)
  4601 00002A0D 7504                <1> 	jne	short vga_wtty_5
  4602                              <1> 	; ycurs++;
  4603 00002A0F FEC6                <1> 	inc	dh ; next row
  4604 00002A11 EB62                <1>         jmp     short vga_wtty_11
  4605                              <1> vga_wtty_5:
  4606 00002A13 80FF09              <1> 	cmp 	bh, 09h ; tab stop
  4607 00002A16 7527                <1> 	jne	short vga_wtty_8
  4608 00002A18 88D0                <1> 	mov	al, dl
  4609 00002A1A 6698                <1> 	cbw
  4610 00002A1C B108                <1> 	mov	cl, 8
  4611 00002A1E F6F1                <1> 	div	cl
  4612 00002A20 28E1                <1> 	sub	cl, ah
  4613                              <1> 	;
  4614 00002A22 B720                <1> 	mov	bh, 20h ; space
  4615                              <1> vga_wtty_6: ; tab stop loop
  4616 00002A24 6651                <1> 	push	cx
  4617 00002A26 6653                <1> 	push	bx
  4618 00002A28 E812000000          <1> 	call	vga_wtty_8
  4619 00002A2D 665B                <1> 	pop	bx  ; bh = character, bl = color
  4620 00002A2F 6659                <1> 	pop	cx
  4621 00002A31 FEC9                <1> 	dec	cl
  4622 00002A33 7409                <1> 	jz	short vga_wtty_7
  4623 00002A35 668B15[FE410100]    <1> 	mov	dx, [CURSOR_POSN] ; new cursor position (pg 0)
  4624 00002A3C EBE6                <1> 	jmp	short vga_wtty_6
  4625                              <1> vga_wtty_7:
  4626 00002A3E C3                  <1> 	retn
  4627                              <1> 	;
  4628                              <1> vga_wtty_8:
  4629 00002A3F 83C64F              <1> 	add	esi, vga_g_memmodel - (vga_g_modes + 1)  
  4630                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4631 00002A42 BF00000A00          <1> 	mov	edi, 0A0000h
  4632                              <1> 	;
  4633 00002A47 88F8                <1> 	mov	al, bh ; character
  4634                              <1> 	;
  4635 00002A49 803E04              <1> 	cmp	byte [esi], PLANAR4
  4636 00002A4C 7414                <1> 	je	short vga_wtty_planar
  4637 00002A4E 803E03              <1> 	cmp	byte [esi], PLANAR1
  4638 00002A51 740F                <1> 	je	short vga_wtty_planar
  4639                              <1> vga_wtty_linear8:
  4640                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
  4641                              <1> 	; AL = car, BL = attr (color), DL = xcurs, DH = ycurs, 
  4642                              <1> 	; [CRT_COLS] = nbcols
  4643 00002A53 E8F3FCFFFF          <1> 	call	write_gfx_char_lin
  4644 00002A58 EB0D                <1> 	jmp	short vga_wtty_9
  4645                              <1> 
  4646                              <1> vga_wtty_12:
  4647                              <1> 	; 09/07/2016
  4648                              <1> 	; set cursor position
  4649                              <1> 	; NOTE: Hardware cursor position will not be set
  4650                              <1> 	;   in any VGA modes (>7)
  4651                              <1> 	;   But, cursor position will be saved into
  4652                              <1> 	;   [CURSOR_POSN].
  4653                              <1> 	;   TRDOS 386 (TRDOS v2.0) uses only one page
  4654                              <1> 	;   (page 0) for all graphics modes.
  4655                              <1> 
  4656 00002A5A 668915[FE410100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  4657                              <1> 	; 04/08/2016
  4658                              <1> 	;mov	bh, [ACTIVE_PAGE] ; = 0
  4659                              <1> 	;call	_set_cpos
  4660 00002A61 C3                  <1> 	retn
  4661                              <1> 
  4662                              <1> vga_wtty_planar:
  4663                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
  4664                              <1> 	; AL = car, BL = attr (color), DL = xcurs, DH = ycurs, 
  4665                              <1> 	; [CRT_COLS]= nbcols, [CHAR_HEIGHT] = cheight
  4666 00002A62 E87BFDFFFF          <1> 	call	write_gfx_char_pl4
  4667                              <1> vga_wtty_9:
  4668 00002A67 FEC2                <1> 	inc	dl ; xcurs++;
  4669                              <1> vga_wtty_10:
  4670                              <1> 	; Do we need to wrap ?
  4671                              <1> 	; if(xcurs==nbcols)
  4672 00002A69 3A15[245E0000]      <1> 	cmp	dl, [CRT_COLS] ; [VGA_COLS]
  4673 00002A6F 7204                <1> 	jb	short vga_wtty_11 ; no
  4674 00002A71 28D2                <1> 	sub	dl, dl ; xcurs=0;
  4675 00002A73 FEC6                <1> 	inc	dh ;  ycurs++;
  4676                              <1> vga_wtty_11:
  4677                              <1> 	; Do we need to scroll ?
  4678                              <1> 	; if(ycurs==nbrows)
  4679 00002A75 3A35[2A5E0000]      <1> 	cmp	dh, [VGA_ROWS]
  4680 00002A7B 72DD                <1> 	jb	short vga_wtty_12 ; no
  4681                              <1> 	;
  4682                              <1> 	; biosfn_scroll (nblines,attr,rul,cul,rlr,clr,page,dir)
  4683                              <1> 	; al = nblines = 1, bl = attr (color) = 0
  4684                              <1> 	; ch = rul, cl = cul, dh = rlr, dl = clr, page = 0
  4685                              <1> 	; dir = SCROLL_UP
  4686                              <1> 	
  4687 00002A7D B001                <1> 	mov	al, 1
  4688 00002A7F 28DB                <1> 	sub	bl, bl ; 0 ; blank/black line (attr=0) will be used
  4689 00002A81 6629C9              <1> 	sub	cx, cx ; 0,0
  4690                              <1> 
  4691                              <1> 	; 06/08/2016
  4692 00002A84 8A35[2A5E0000]      <1> 	mov	dh, [VGA_ROWS]
  4693 00002A8A FECE                <1> 	dec	dh ; nbrows -1
  4694                              <1> 
  4695 00002A8C 6652                <1> 	push	dx 	; 04/08/2016
  4696 00002A8E 8A15[245E0000]      <1> 	mov	dl, [CRT_COLS]
  4697 00002A94 FECA                <1> 	dec	dl ; nbcols -1
  4698                              <1> 	
  4699 00002A96 8A25[225E0000]      <1> 	mov	ah, [CRT_MODE]
  4700                              <1> 	
  4701                              <1> 	; biosfn_scroll(0x01,0x00,0,0,nbrows-1,nbcols-1,page,SCROLL_UP);
  4702 00002A9C E808F5FFFF          <1> 	call	vga_graphics_up
  4703                              <1> 	; 04/08/2016
  4704 00002AA1 665A                <1> 	pop	dx
  4705                              <1> 	;dec	dh ; ycurs-=1
  4706 00002AA3 EBB5                <1> 	jmp	short vga_wtty_12 
  4707                              <1> 
  4708                              <1> font_setup:
  4709                              <1> 	; 09/07/2016
  4710                              <1> 	; character generator (font loading) functions
  4711                              <1> 	;
  4712                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4713                              <1> 	; vgabios-0.7a (2011)
  4714                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4715                              <1> 	; 'vgabios.c', 'int10_func'
  4716                              <1> 
  4717                              <1> 	; AX = 1100H ; Load User-Defined Font (EGA/VGA)
  4718                              <1> 	;
  4719                              <1>         ; BH    height of each character (bytes per character definition)
  4720                              <1>         ; (BL   font block to load (EGA: 0-3; VGA: 0-7))
  4721                              <1> 	; CX    number of characters to redefine (<=256)
  4722                              <1>         ; DX    ASCII code of the first character defined at ES:BP
  4723                              <1>         ; EBP	address of font-definition information
  4724                              <1> 	;	(in user's memory space)
  4725                              <1> 
  4726                              <1> 	; case 0x11:
  4727                              <1>      	; switch(GET_AL())
  4728                              <1>       	; {
  4729                              <1> 	; case 0x00:
  4730                              <1>         ; case 0x10:
  4731                              <1>         ; biosfn_load_text_user_pat(GET_AL(),ES,BP,CX,DX,GET_BL(),GET_BH());
  4732                              <1>         ; break;
  4733                              <1> 
  4734                              <1> 	; AX = 1110H ; Load and Activate User-Defined Font (EGA/VGA)
  4735 00002AA5 08C0                <1> 	or	al, al ; 0
  4736 00002AA7 7404                <1> 	jz	short font_setup_0
  4737 00002AA9 3C10                <1> 	cmp	al, 10h
  4738 00002AAB 7511                <1> 	jne	short font_setup_1	
  4739                              <1> font_setup_0:
  4740 00002AAD E8B7000000          <1> 	call	transfer_user_fonts
  4741 00002AB2 721C                <1> 	jc	short font_setup_error
  4742 00002AB4 E8C2000000          <1> 	call	load_text_user_pat
  4743 00002AB9 E996EAFFFF          <1>         jmp     VIDEO_RETURN 
  4744                              <1> font_setup_1:
  4745                              <1> 	; AX = 1101H ; Load ROM 8x14 Character Set (EGA/VGA)
  4746                              <1> 	; case 0x01:
  4747                              <1>         ; case 0x11:
  4748                              <1>         ; biosfn_load_text_8_14_pat(GET_AL(),GET_BL());
  4749                              <1>         ; break;
  4750 00002ABE 3C01                <1> 	cmp	al, 1
  4751 00002AC0 7404                <1> 	je	short font_setup_2
  4752 00002AC2 3C11                <1> 	cmp	al, 11h
  4753 00002AC4 7511                <1> 	jne	short font_setup_3	
  4754                              <1> font_setup_2:
  4755                              <1> 	; AX = 1111H ; Load and Activate ROM 8x14 Character Set (EGA/VGA)
  4756                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  4757 00002AC6 E8EE010000          <1> 	call	load_text_8_14_pat
  4758 00002ACB E984EAFFFF          <1>         jmp     VIDEO_RETURN
  4759                              <1> font_setup_error:
  4760 00002AD0 29C0                <1> 	sub	eax, eax ; 0 -> fonts could not be loaded
  4761 00002AD2 E982EAFFFF          <1> 	jmp	_video_return
  4762                              <1> font_setup_3:
  4763                              <1> 	; AX = 1102H ; Load ROM 8x8 Character Set (EGA/VGA)
  4764                              <1> 	; case 0x02:
  4765                              <1>         ; case 0x12:
  4766                              <1>         ; biosfn_load_text_8_8_pat(GET_AL(),GET_BL());
  4767                              <1>         ; break;
  4768 00002AD7 3C02                <1> 	cmp	al, 2
  4769 00002AD9 7404                <1> 	je	short font_setup_4
  4770 00002ADB 3C12                <1> 	cmp	al, 12h
  4771 00002ADD 750A                <1> 	jne	short font_setup_5	
  4772                              <1> font_setup_4:
  4773                              <1> 	; AX = 1112H ; Load and Activate ROM 8x8 Character Set (EGA/VGA)
  4774                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  4775 00002ADF E805020000          <1> 	call	load_text_8_8_pat
  4776 00002AE4 E96BEAFFFF          <1>         jmp     VIDEO_RETURN
  4777                              <1> font_setup_5:
  4778                              <1> 	; AX = 1104H ; Load ROM 8x16 Character Set (EGA/VGA)
  4779                              <1> 	; case 0x04:
  4780                              <1>         ; case 0x14:
  4781                              <1>         ; biosfn_load_text_8_16_pat(GET_AL(),GET_BL());
  4782                              <1>         ; break;
  4783 00002AE9 3C04                <1> 	cmp	al, 4
  4784 00002AEB 7404                <1> 	je	short font_setup_6
  4785 00002AED 3C14                <1> 	cmp	al, 14h
  4786 00002AEF 750A                <1> 	jne	short font_setup_7	
  4787                              <1> font_setup_6:
  4788                              <1> 	; AX = 1114H ; Load and Activate ROM 8x16 Character Set (EGA/VGA)
  4789                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  4790 00002AF1 E823020000          <1> 	call	load_text_8_16_pat
  4791 00002AF6 E959EAFFFF          <1>         jmp     VIDEO_RETURN
  4792                              <1> font_setup_7:
  4793                              <1> 	; Note: AX=1120h (Setup INT 1Fh, EXT_PTR) is not needed
  4794                              <1> 	; for TRDOS 386 (TRDIOS v2.0) video functionality;
  4795                              <1> 	; because, originally EXT_PTR (font address) was used for
  4796                              <1> 	; chars 80h to 0FFh (after the first 128 ASCII char fonts), for
  4797                              <1> 	; CGA graphics mode; currenty, 'vgafont8' address has 256 chars!
  4798                              <1> 	; 
  4799                              <1> 	; case 0x20:
  4800                              <1>         ; biosfn_load_gfx_8_8_chars(ES,BP);
  4801                              <1>         ; break; 
  4802                              <1> 	; case 0x21:
  4803                              <1>         ; biosfn_load_gfx_user_chars(ES,BP,CX,GET_BL(),GET_DL());
  4804                              <1>         ; break;
  4805                              <1> 	; AX = 1121H ; Setup User-Defined Font for Graphics Mode (VGA)
  4806                              <1> 	; BL   screen rows code: 00H = user-specified (in DL)
  4807                              <1>         ;                        01H = 14 rows
  4808                              <1>         ;                        02H = 25 rows
  4809                              <1>         ;                        03H = 43 rows
  4810                              <1>         ; CX   bytes per character definition
  4811                              <1>         ; DL   (when BL=0) custom number of character rows on screen
  4812                              <1>         ; EBP  address of font-definition information (user's mem space)
  4813                              <1> 
  4814 00002AFB 3C21                <1> 	cmp	al, 21h
  4815 00002AFD 751A                <1> 	jne	short font_setup_9
  4816                              <1> 
  4817                              <1> 	; TRDOS 386 modification !
  4818                              <1> 	; dh = 0 -> 256 characters
  4819                              <1> 	; dh = 80h -> 128 characters
  4820                              <1> 	; (If DH <> 0 and DH <> 80h -> invalid)     
  4821 00002AFF 20F6                <1> 	and	dh, dh
  4822 00002B01 7405                <1> 	jz	short font_setup_8 ; 256 characters
  4823 00002B03 80FE80              <1> 	cmp	dh, 80h ; 128 characters
  4824 00002B06 75C8                <1> 	jne	short font_setup_error ; invalid !
  4825                              <1> font_setup_8:
  4826 00002B08 E85C000000          <1> 	call	transfer_user_fonts
  4827 00002B0D 72C1                <1> 	jc	short font_setup_error
  4828                              <1> 	; ebp = user's font data address in system's memory space
  4829 00002B0F E836020000          <1> 	call	load_gfx_user_chars
  4830 00002B14 E93BEAFFFF          <1>         jmp     VIDEO_RETURN 
  4831                              <1> font_setup_9:
  4832                              <1> 	; case 0x22:
  4833                              <1>         ; biosfn_load_gfx_8_14_chars(GET_BL());
  4834                              <1>         ; break;
  4835 00002B19 3C22                <1> 	cmp	al, 22h
  4836 00002B1B 750A                <1> 	jne	short font_setup_10
  4837 00002B1D E866020000          <1> 	call	load_gfx_8_14_chars	
  4838 00002B22 E92DEAFFFF          <1>         jmp     VIDEO_RETURN 
  4839                              <1> font_setup_10:	
  4840                              <1> 	; case 0x23:
  4841                              <1>         ; biosfn_load_gfx_8_8_dd_chars(GET_BL());
  4842                              <1>         ; break;
  4843 00002B27 3C23                <1> 	cmp	al, 23h
  4844 00002B29 750A                <1> 	jne	short font_setup_11
  4845 00002B2B E899020000          <1> 	call	load_gfx_8_8_chars	
  4846 00002B30 E91FEAFFFF          <1>         jmp     VIDEO_RETURN 
  4847                              <1> font_setup_11:	
  4848                              <1> 	; case 0x24:
  4849                              <1>         ; biosfn_load_gfx_8_16_chars(GET_BL());
  4850                              <1>         ; break;
  4851 00002B35 3C24                <1> 	cmp	al, 24h
  4852 00002B37 750A                <1> 	jne	short font_setup_12
  4853 00002B39 E8CC020000          <1> 	call	load_gfx_8_16_chars	
  4854 00002B3E E911EAFFFF          <1>         jmp     VIDEO_RETURN 
  4855                              <1> font_setup_12:
  4856                              <1>  	; case 0x30:
  4857                              <1>         ; biosfn_get_font_info(GET_BH(),&ES,&BP,&CX,&DX);
  4858                              <1>         ; break;
  4859 00002B43 3C30                <1> 	cmp	al, 30h
  4860 00002B45 750A                <1> 	jne	short font_setup_13			
  4861 00002B47 E8FF020000          <1> 	call	get_font_info
  4862                              <1> 	; eax = return value (info: 4 bytes for 4 parms)
  4863                              <1> 	; eax = 0 -> invalid function (input)
  4864 00002B4C E908EAFFFF          <1>         jmp     _video_return
  4865                              <1> font_setup_13:
  4866 00002B51 3C03                <1> 	cmp	al, 03h ; AX = 1103h	
  4867 00002B53 750D                <1> 	jne	short font_setup_14
  4868                              <1> 	; biosfn_set_text_block_specifier:
  4869                              <1> 	; BL = font block selector code	
  4870                              <1> 	; NOTE: TRDOS 386 only uses and sets font block 0
  4871                              <1> 	; (It is as BL = 0 for TRDOS 386)
  4872 00002B55 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4873                              <1> 	;mov	ah, bl
  4874 00002B59 28E4                <1> 	sub	ah, ah ; 0
  4875                              <1> 	;mov	al, 03h
  4876 00002B5B 66EF                <1> 	out	dx, ax
  4877 00002B5D E9F2E9FFFF          <1> 	jmp     VIDEO_RETURN 
  4878                              <1> 	
  4879                              <1> font_setup_14:
  4880 00002B62 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  4881 00002B64 E9F0E9FFFF          <1>         jmp     _video_return
  4882                              <1> 
  4883                              <1> transfer_user_fonts:
  4884                              <1> 	; 09/07/2016
  4885                              <1> 	;and	ecx, 0FFFFh
  4886                              <1> 	; ECX = byte count
  4887                              <1> 	;push	ecx
  4888 00002B69 89EE                <1> 	mov	esi, ebp ; user buffer
  4889 00002B6B BF00000700          <1> 	mov	edi, Cluster_Buffer  ; system buffer
  4890 00002B70 E8A1BC0000          <1> 	call	transfer_from_user_buffer
  4891                              <1> 	;pop	ecx
  4892                              <1> 	; ecx = transfer (byte) count = character count
  4893 00002B75 BD00000700          <1> 	mov	ebp, Cluster_Buffer
  4894                              <1> 	; jc	VIDEO_RETURN -> failed
  4895 00002B7A C3                  <1> 	retn
  4896                              <1> 
  4897                              <1> load_text_user_pat:
  4898                              <1> 	; 26/07/2016
  4899                              <1> 	; 09/07/2016
  4900                              <1> 	; load user defined (EGA/VGA) text fonts
  4901                              <1> 	;
  4902                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4903                              <1> 	; vgabios-0.7a (2011)
  4904                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4905                              <1> 	; 'vgabios.c', 'biosfn_load_text_user_pat'
  4906                              <1> 
  4907                              <1> 	; biosfn_load_text_user_pat (AL,ES,BP,CX,DX,BL,BH)
  4908                              <1> 
  4909                              <1> 	; get_font_access();
  4910                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  4911                              <1> 	; for(i=0;i<CX;i++)
  4912                              <1> 	; {
  4913                              <1> 	;  src = BP + i * BH;
  4914                              <1> 	;  dest = blockaddr + (DX + i) * 32;
  4915                              <1> 	;  memcpyb(0xA000, dest, ES, src, BH);
  4916                              <1> 	; }
  4917                              <1> 	; release_font_access();
  4918                              <1> 	; if(AL>=0x10)
  4919                              <1> 	; {
  4920                              <1> 	; set_scan_lines(BH);
  4921                              <1> 	; }
  4922                              <1> 
  4923 00002B7B 50                  <1> 	push	eax
  4924 00002B7C E83C000000          <1> 	call	get_font_access
  4925 00002B81 28DB                <1> 	sub	bl, bl ; i = 0	
  4926                              <1> ltup_1:
  4927 00002B83 88D8                <1> 	mov	al, bl
  4928 00002B85 F6E7                <1> 	mul	bh
  4929 00002B87 0FB7F0              <1> 	movzx	esi, ax
  4930 00002B8A 01EE                <1> 	add	esi, ebp
  4931 00002B8C 88D8                <1> 	mov	al, bl
  4932 00002B8E 28E4                <1> 	sub	ah, ah
  4933 00002B90 6601D0              <1> 	add	ax, dx ; (DX + i)
  4934 00002B93 66C1E005            <1> 	shl	ax, 5  ; * 32
  4935 00002B97 0FB7F8              <1> 	movzx	edi, ax
  4936 00002B9A 81C700000A00        <1> 	add	edi, 0A0000h
  4937 00002BA0 51                  <1> 	push	ecx
  4938 00002BA1 0FB6CF              <1> 	movzx	ecx, bh 		
  4939 00002BA4 F3A4                <1> 	rep	movsb
  4940 00002BA6 59                  <1> 	pop	ecx	
  4941 00002BA7 FEC3                <1> 	inc	bl
  4942 00002BA9 38CB                <1> 	cmp	bl, cl
  4943 00002BAB 75D6                <1> 	jne	short ltup_1	
  4944                              <1> 	;
  4945 00002BAD E840000000          <1> 	call	release_font_access
  4946                              <1> 	;
  4947 00002BB2 58                  <1> 	pop	eax
  4948                              <1> 	; if(AL>=0x10)
  4949 00002BB3 3C10                <1> 	cmp	al, 10h
  4950 00002BB5 7205                <1> 	jb	short ltup_2
  4951                              <1>    	; set_scan_lines(BH);
  4952 00002BB7 E875000000          <1> 	call	set_scan_lines
  4953                              <1> ltup_2:
  4954 00002BBC C3                  <1> 	retn
  4955                              <1> 
  4956                              <1> get_font_access:
  4957                              <1> 	; 09/07/2016
  4958                              <1> 	;
  4959                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4960                              <1> 	; vgabios-0.7a (2011)
  4961                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4962                              <1> 	; 'vgabios.c', 'get_font_access'
  4963                              <1> 
  4964                              <1> 	; get_font_access()
  4965 00002BBD 52                  <1> 	push	edx
  4966 00002BBE 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4967 00002BC2 66B80001            <1> 	mov	ax, 0100h
  4968 00002BC6 66EF                <1> 	out	dx, ax
  4969 00002BC8 66B80204            <1> 	mov	ax, 0402h
  4970 00002BCC 66EF                <1> 	out	dx, ax
  4971 00002BCE 66B80407            <1> 	mov	ax, 0704h
  4972 00002BD2 66EF                <1> 	out	dx, ax
  4973 00002BD4 66B80003            <1> 	mov	ax, 0300h
  4974 00002BD8 66EF                <1> 	out	dx, ax
  4975 00002BDA 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4976 00002BDE 66B80402            <1> 	mov	ax, 0204h
  4977 00002BE2 66EF                <1> 	out	dx, ax
  4978 00002BE4 66B80500            <1> 	mov	ax, 0005h
  4979 00002BE8 66EF                <1> 	out	dx, ax
  4980 00002BEA 66B80604            <1> 	mov	ax, 0406h
  4981 00002BEE 66EF                <1> 	out	dx, ax
  4982 00002BF0 5A                  <1> 	pop	edx
  4983 00002BF1 C3                  <1> 	retn
  4984                              <1> 
  4985                              <1> release_font_access:
  4986                              <1> 	; 29/07/2016
  4987                              <1> 	; 09/07/2016
  4988                              <1> 	;
  4989                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4990                              <1> 	; vgabios-0.7a (2011)
  4991                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4992                              <1> 	; 'vgabios.c', 'release_font_access'
  4993                              <1> 
  4994 00002BF2 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4995 00002BF6 66B80001            <1> 	mov	ax, 0100h
  4996 00002BFA 66EF                <1> 	out	dx, ax
  4997 00002BFC 66B80203            <1> 	mov	ax, 0302h
  4998 00002C00 66EF                <1> 	out	dx, ax
  4999 00002C02 66B80403            <1> 	mov	ax, 0304h
  5000 00002C06 66EF                <1> 	out	dx, ax
  5001 00002C08 66B80003            <1> 	mov	ax, 0300h
  5002 00002C0C 66EF                <1> 	out	dx, ax
  5003 00002C0E 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
  5004 00002C12 EC                  <1>  	in	al, dx
  5005 00002C13 2401                <1> 	and	al, 01h
  5006 00002C15 C0E002              <1> 	shl	al, 2
  5007 00002C18 0C0A                <1> 	or	al, 0Ah
  5008 00002C1A 88C4                <1> 	mov	ah, al
  5009 00002C1C B006                <1> 	mov	al, 06h
  5010 00002C1E 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5011 00002C22 66EF                <1> 	out	dx, ax
  5012 00002C24 66B80400            <1> 	mov	ax, 0004h
  5013 00002C28 66EF                <1> 	out	dx, ax
  5014 00002C2A 66B80510            <1> 	mov	ax, 1005h
  5015 00002C2E 66EF                <1> 	out	dx, ax
  5016 00002C30 C3                  <1> 	retn
  5017                              <1> 
  5018                              <1> set_scan_lines:
  5019                              <1> 	; 09/07/2016
  5020                              <1> 	;
  5021                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5022                              <1> 	; vgabios-0.7a (2011)
  5023                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5024                              <1> 	; 'vgabios.c', 'set_scan_lines'
  5025                              <1> 
  5026                              <1> 	; set_scan_lines(lines)
  5027                              <1> 	; BH = lines
  5028                              <1> 
  5029                              <1> 	; outb(crtc_addr, 0x09);
  5030 00002C31 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS = 3D4h (always)
  5031 00002C35 B009                <1> 	mov	al, 09h
  5032 00002C37 EE                  <1> 	out	dx, al
  5033                              <1> 	; crtc_r9 = inb(crtc_addr+1);
  5034 00002C38 6642                <1> 	inc	dx ; 3D5h
  5035 00002C3A EC                  <1> 	in	al, dx
  5036                              <1> 	; crtc_r9 = (crtc_r9 & 0xe0) | (lines - 1);
  5037 00002C3B 24E0                <1> 	and	al, 0E0h
  5038 00002C3D FECF                <1> 	dec	bh ; lines - 1
  5039 00002C3F 08F8                <1> 	or	al, bh
  5040                              <1> 	; outb(crtc_addr+1, crtc_r9);
  5041 00002C41 EE                  <1> 	out	dx, al
  5042                              <1> 	;inc	bh 
  5043                              <1> 	; if(lines==8)
  5044                              <1> 	;cmp	bh, 8
  5045 00002C42 80FF07              <1> 	cmp	bh, 7
  5046 00002C45 7506                <1> 	jne	short ssl_1
  5047                              <1> 	; biosfn_set_cursor_shape(0x06,0x07);
  5048 00002C47 66B90706            <1> 	mov	cx, 0607h
  5049 00002C4B EB06                <1> 	jmp	short ssl_2
  5050                              <1> ssl_1:
  5051                              <1> 	; biosfn_set_cursor_shape(lines-4,lines-3);
  5052 00002C4D 88F9                <1> 	mov	cl, bh ; lines - 1
  5053 00002C4F 88CD                <1> 	mov	ch, cl ; lines - 1 (16 -> 15)
  5054 00002C51 FECD                <1> 	dec	ch  ; lines - 2 (16 -> 14)
  5055                              <1> ssl_2:
  5056                              <1> 	; CH = start line, CL = stop line
  5057 00002C53 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
  5058 00002C55 66890D[3B5E0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
  5059 00002C5C E812F1FFFF          <1> 	call	m16	; output cx register
  5060                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT, lines);
  5061 00002C61 FEC7                <1> 	inc	bh ; lines
  5062 00002C63 883D[265E0000]      <1> 	mov	[CHAR_HEIGHT], bh
  5063                              <1> 	;  outb(crtc_addr, 0x12);
  5064 00002C69 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS
  5065 00002C6D B012                <1> 	mov	al, 12h
  5066 00002C6F EE                  <1> 	out	dx, al
  5067                              <1> 	; vde = inb(crtc_addr+1);
  5068 00002C70 6642                <1> 	inc	dx
  5069 00002C72 EC                  <1> 	in	al, dx
  5070 00002C73 88C4                <1> 	mov	ah, al
  5071                              <1> 	; outb(crtc_addr, 0x07);
  5072 00002C75 664A                <1> 	dec	dx
  5073 00002C77 B007                <1> 	mov	al, 07h
  5074 00002C79 EE                  <1> 	out	dx, al
  5075                              <1> 	; ovl = inb(crtc_addr+1);
  5076 00002C7A 6642                <1> 	inc	dx
  5077 00002C7C EC                  <1> 	in	al, dx
  5078                              <1> 	; vde += (((ovl & 0x02) << 7) + ((ovl & 0x40) << 3) + 1);
  5079 00002C7D 88E2                <1> 	mov	dl, ah ; vde
  5080 00002C7F 88C6                <1> 	mov	dh, al ; ovl
  5081 00002C81 6683E002            <1> 	and	ax, 02h
  5082 00002C85 66C1E007            <1> 	shl	ax, 7
  5083 00002C89 6689C1              <1> 	mov	cx, ax ; (ovl & 0x02) << 7)	
  5084 00002C8C 88F0                <1> 	mov	al, dh ; ovl
  5085 00002C8E 6683E040            <1> 	and	ax, 40h			
  5086 00002C92 66C1E003            <1> 	shl	ax, 3  ; (ovl & 0x40) << 3)
  5087 00002C96 6640                <1> 	inc	ax ; + 1 
  5088 00002C98 6601C8              <1> 	add	ax, cx
  5089 00002C9B 30F6                <1> 	xor	dh, dh
  5090 00002C9D 6601D0              <1> 	add	ax, dx ; + vde
  5091                              <1> 	; rows = vde / lines;
  5092 00002CA0 F6F7                <1> 	div	bh
  5093                              <1> 	;dec	al ; rows -1
  5094                              <1> 	; write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, rows-1);
  5095 00002CA2 A2[2A5E0000]        <1> 	mov	[VGA_ROWS], al ; rows (not 'rows-1' !)
  5096                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE, rows * cols * 2);
  5097 00002CA7 8A25[245E0000]      <1> 	mov	ah, [CRT_COLS]
  5098 00002CAD F6E4                <1> 	mul	ah
  5099 00002CAF 66D1E0              <1> 	shl	ax, 1
  5100 00002CB2 66A3[7C4F0100]      <1> 	mov 	[CRT_LEN], ax	
  5101 00002CB8 C3                  <1> 	retn
  5102                              <1> 
  5103                              <1> load_text_8_14_pat:
  5104                              <1> 	; 26/07/2016
  5105                              <1> 	; 25/07/2016
  5106                              <1> 	; 23/07/2016
  5107                              <1> 	; 09/07/2016
  5108                              <1> 	; load user defined (EGA/VGA) text fonts
  5109                              <1> 	;
  5110                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5111                              <1> 	; vgabios-0.7a (2011)
  5112                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5113                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_14_pat'
  5114                              <1> 
  5115                              <1> 	; biosfn_load_text_8_14_pat (AL,BL)
  5116                              <1> 
  5117                              <1> 	; get_font_access();
  5118                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5119                              <1> 	; for(i=0;i<0x100;i++)
  5120                              <1> 	; {
  5121                              <1> 	;  src = i * 14;
  5122                              <1> 	;  dest = blockaddr + i * 32;
  5123                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont14+src, 14);
  5124                              <1> 	; }
  5125                              <1> 	; release_font_access();
  5126                              <1> 	; if(AL>=0x10)
  5127                              <1> 	; {
  5128                              <1> 	; set_scan_lines(14);
  5129                              <1> 	; }
  5130                              <1> 
  5131 00002CB9 50                  <1> 	push	eax
  5132 00002CBA E8FEFEFFFF          <1> 	call	get_font_access
  5133                              <1> 
  5134                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5135                              <1> 	;mov	dl, bl
  5136                              <1> 	;and	dl, 3
  5137                              <1> 	;shl	dx, 14
  5138                              <1> 	;xchg	dx, bx
  5139                              <1> 	;and	dl, 4
  5140                              <1> 	;shl	dx, 11
  5141                              <1> 	;add	dx, bx 	
  5142                              <1>  
  5143                              <1> 	;xor	dx, dx  ; blockaddr = 0
  5144                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0(
  5145                              <1> 
  5146 00002CBF 28DB                <1> 	sub	bl, bl ; i = 0
  5147 00002CC1 B70E                <1> 	mov	bh, 14
  5148 00002CC3 BE[5C1E0100]        <1> 	mov	esi, vgafont14
  5149 00002CC8 BF00000A00          <1> 	mov	edi, 0A0000h		
  5150                              <1> lt8_14_1:
  5151                              <1> 	;mov	al, bl
  5152                              <1> 	;mul	bh
  5153                              <1> 	;movzx	esi, ax
  5154                              <1> 	;add	esi, vgafont14
  5155                              <1> 	;mov	al, bl
  5156                              <1> 	;sub	ah, ah
  5157                              <1> 	;shl	ax, 5 ; * 32
  5158                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  5159                              <1> 	;movzx	edi, ax ; dest
  5160                              <1> 	;add	edi, 0A0000h
  5161 00002CCD 0FB6CF              <1> 	movzx	ecx, bh 		
  5162 00002CD0 F3A4                <1> 	rep	movsb
  5163 00002CD2 83C712              <1> 	add	edi, 18 ; 32 - 14
  5164 00002CD5 FEC3                <1> 	inc	bl
  5165 00002CD7 75F4                <1> 	jnz	short lt8_14_1	
  5166                              <1> 	;
  5167 00002CD9 E814FFFFFF          <1> 	call	release_font_access
  5168                              <1> 	;
  5169 00002CDE 58                  <1> 	pop	eax
  5170                              <1> 	; if(AL>=0x10)
  5171 00002CDF 3C10                <1> 	cmp	al, 10h
  5172 00002CE1 7205                <1> 	jb	short lt8_14_4
  5173                              <1> 	; BH = 14
  5174                              <1>    	; set_scan_lines(14);
  5175 00002CE3 E849FFFFFF          <1> 	call	set_scan_lines
  5176                              <1> lt8_14_4:
  5177 00002CE8 C3                  <1> 	retn
  5178                              <1> 
  5179                              <1> load_text_8_8_pat:
  5180                              <1> 	; 26/07/2016
  5181                              <1> 	; 25/07/2016
  5182                              <1> 	; 23/07/2016
  5183                              <1> 	; 09/07/2016
  5184                              <1> 	; load user defined (EGA/VGA) text fonts
  5185                              <1> 	;
  5186                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5187                              <1> 	; vgabios-0.7a (2011)
  5188                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5189                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_8_pat'
  5190                              <1> 
  5191                              <1> 	; biosfn_load_text_8_8_pat (AL,BL)
  5192                              <1> 
  5193                              <1> 	; get_font_access();
  5194                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5195                              <1> 	; for(i=0;i<0x100;i++)
  5196                              <1> 	; {
  5197                              <1> 	;  src = i * 8;
  5198                              <1> 	;  dest = blockaddr + i * 32;
  5199                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont8+src, 8);
  5200                              <1> 	; }
  5201                              <1> 	; release_font_access();
  5202                              <1> 	; if(AL>=0x10)
  5203                              <1> 	; {
  5204                              <1> 	; set_scan_lines(8);
  5205                              <1> 	; }
  5206                              <1> 
  5207 00002CE9 50                  <1> 	push	eax
  5208 00002CEA E8CEFEFFFF          <1> 	call	get_font_access
  5209                              <1> 
  5210                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5211                              <1> 	;mov	dl, bl
  5212                              <1> 	;and	dl, 3
  5213                              <1> 	;shl	dx, 14
  5214                              <1> 	;xchg	dx, bx
  5215                              <1> 	;and	dl, 4
  5216                              <1> 	;shl	dx, 11
  5217                              <1> 	;add	dx, bx 	
  5218                              <1>  
  5219                              <1> 	;xor	dx, dx  ; blockaddr = 0
  5220                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0(
  5221                              <1> 
  5222 00002CEF 28DB                <1> 	sub	bl, bl ; i = 0
  5223 00002CF1 B708                <1> 	mov	bh, 8
  5224 00002CF3 BE[5C160100]        <1> 	mov	esi, vgafont8
  5225 00002CF8 BF00000A00          <1> 	mov	edi, 0A0000h		
  5226                              <1> lt8_8_1:
  5227                              <1> 	;mov	al, bl
  5228                              <1> 	;mul	bh
  5229                              <1> 	;movzx	esi, ax
  5230                              <1> 	;add	esi, vgafont8
  5231                              <1> 	;mov	al, bl
  5232                              <1> 	;sub	ah, ah
  5233                              <1> 	;shl	ax, 5 ; * 32
  5234                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  5235                              <1> 	;movzx	edi, ax ; dest
  5236                              <1> 	;add	edi, 0A0000h
  5237 00002CFD 0FB6CF              <1> 	movzx	ecx, bh 		
  5238 00002D00 F3A4                <1> 	rep	movsb
  5239 00002D02 83C718              <1> 	add	edi, 24 ; 32 - 8
  5240 00002D05 FEC3                <1> 	inc	bl
  5241 00002D07 75F4                <1> 	jnz	short lt8_8_1	
  5242                              <1> 	;
  5243 00002D09 E8E4FEFFFF          <1> 	call	release_font_access
  5244                              <1> 	;
  5245 00002D0E 58                  <1> 	pop	eax
  5246                              <1> 	; if(AL>=0x10)
  5247 00002D0F 3C10                <1> 	cmp	al, 10h
  5248 00002D11 7205                <1> 	jb	short lt8_8_2
  5249                              <1> 	; BH = 8
  5250                              <1>    	; set_scan_lines(8);
  5251 00002D13 E819FFFFFF          <1> 	call	set_scan_lines
  5252                              <1> lt8_8_2:
  5253 00002D18 C3                  <1> 	retn
  5254                              <1> 
  5255                              <1> load_text_8_16_pat:
  5256                              <1> 	; 26/07/2016
  5257                              <1> 	; 25/07/2016
  5258                              <1> 	; 23/07/2016
  5259                              <1> 	; 09/07/2016
  5260                              <1> 	; load user defined (EGA/VGA) text fonts
  5261                              <1> 	;
  5262                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5263                              <1> 	; vgabios-0.7a (2011)
  5264                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5265                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_16_pat'
  5266                              <1> 
  5267                              <1> 	; biosfn_load_text_8_16_pat (AL,BL)
  5268                              <1> 
  5269                              <1> 	; get_font_access();
  5270                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5271                              <1> 	; for(i=0;i<0x100;i++)
  5272                              <1> 	; {
  5273                              <1> 	;  src = i * 16;
  5274                              <1> 	;  dest = blockaddr + i * 32;
  5275                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont16+src, 16);
  5276                              <1> 	; }
  5277                              <1> 	; release_font_access();
  5278                              <1> 	; if(AL>=0x10)
  5279                              <1> 	; {
  5280                              <1> 	; set_scan_lines(16);
  5281                              <1> 	; }
  5282                              <1> 
  5283 00002D19 50                  <1> 	push	eax
  5284 00002D1A E89EFEFFFF          <1> 	call	get_font_access
  5285                              <1> 
  5286                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5287                              <1> 	;mov	dl, bl
  5288                              <1> 	;and	dl, 3
  5289                              <1> 	;shl	dx, 14
  5290                              <1> 	;xchg	dx, bx
  5291                              <1> 	;and	dl, 4
  5292                              <1> 	;shl	dx, 11
  5293                              <1> 	;add	dx, bx 	
  5294                              <1>  
  5295                              <1> 	;xor	dx, dx  ; blockaddr = 0
  5296                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0(
  5297                              <1> 
  5298 00002D1F 28DB                <1> 	sub	bl, bl ; i = 0
  5299 00002D21 B710                <1> 	mov	bh, 16
  5300 00002D23 BE[5C2C0100]        <1> 	mov	esi, vgafont16
  5301 00002D28 BF00000A00          <1> 	mov	edi, 0A0000h
  5302 00002D2D 0FB6C7              <1> 	movzx	eax, bh	
  5303                              <1> lt8_16_1:
  5304                              <1> 	;mov	al, bl
  5305                              <1> 	;mul	bh
  5306                              <1> 	;movzx	esi, ax
  5307                              <1> 	;add	esi, vgafont16
  5308                              <1> 	;mov	al, bl ; i
  5309                              <1> 	;sub	ah, ah
  5310                              <1> 	;shl	ax, 5 ; * 32
  5311                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  5312                              <1> 	;movzx	edi, ax ; dest
  5313                              <1> 	;add	edi, 0A0000h
  5314                              <1> 	;movzx	ecx, bh
  5315 00002D30 89C1                <1> 	mov	ecx, eax ; 16	
  5316 00002D32 F3A4                <1> 	rep	movsb
  5317 00002D34 01C7                <1> 	add	edi, eax ; add edi, 16
  5318 00002D36 FEC3                <1> 	inc	bl
  5319 00002D38 75F6                <1> 	jnz	short lt8_16_1
  5320                              <1> 	;
  5321 00002D3A E8B3FEFFFF          <1> 	call	release_font_access
  5322                              <1> 	;
  5323 00002D3F 58                  <1> 	pop	eax
  5324                              <1> 	; if(AL>=0x10)
  5325 00002D40 3C10                <1> 	cmp	al, 10h
  5326 00002D42 7205                <1> 	jb	short lt8_16_2
  5327                              <1> 	; BH = 16
  5328                              <1>    	; set_scan_lines(16);
  5329 00002D44 E8E8FEFFFF          <1> 	call	set_scan_lines
  5330                              <1> lt8_16_2:
  5331 00002D49 C3                  <1> 	retn
  5332                              <1> 
  5333                              <1> load_gfx_user_chars:
  5334                              <1> 	; 08/08/2016
  5335                              <1> 	; 10/07/2016
  5336                              <1> 	; Setup User-Defined Font for Graphics Mode (VGA)
  5337                              <1> 	;
  5338                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5339                              <1> 	; vgabios-0.7a (2011)
  5340                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5341                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_user_chars'
  5342                              <1> 
  5343                              <1> 	; biosfn_load_gfx_user_chars (ES,BP,CX,BL,DL)
  5344                              <1> 	; /* set 0x43 INT pointer */
  5345                              <1>     	; write_word(0x0, 0x43*4, BP);
  5346                              <1>     	; write_word(0x0, 0x43*4+2, ES);
  5347 00002D4A 31C0                <1> 	xor	eax, eax
  5348 00002D4C 48                  <1> 	dec	eax ; 0FFFFFFFFh (user defined fonts)
  5349 00002D4D A3[8E4F0100]        <1> 	mov	[VGA_INT43H], eax
  5350                              <1> 		
  5351                              <1> 	; BL   screen rows code: 00H = user-specified (in DL)
  5352                              <1>         ;                        01H = 14 rows
  5353                              <1>         ;                        02H = 25 rows
  5354                              <1>         ;                        03H = 43 rows
  5355                              <1>         ; CX   bytes per character definition
  5356                              <1>         ; DL   (when BL=0) custom number of character rows on screen
  5357                              <1> 	; dh = 0 -> 256 characters
  5358                              <1> 	; dh = 80h -> 128 characters
  5359                              <1> 	; (If DH <> 0 and DH <> 80h -> invalid)     	 
  5360                              <1>         ; EBP  address of font-definition information (user's mem space)
  5361                              <1> 
  5362                              <1> 	; switch (BL) {
  5363                              <1> 	; case 0:
  5364                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5365                              <1> 	;    break;
  5366 00002D52 20DB                <1> 	and	bl, bl
  5367 00002D54 7508                <1> 	jnz	short l_gfx_uc_1
  5368 00002D56 8815[2A5E0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5369 00002D5C EB23                <1> 	jmp	short l_gfx_uc_4 	
  5370                              <1> l_gfx_uc_1:
  5371                              <1> 	; case 1:
  5372                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5373                              <1> 	;    break;
  5374 00002D5E FECB                <1> 	dec	bl
  5375 00002D60 7509                <1> 	jnz	short l_gfx_uc_2
  5376                              <1> 	; bl = 1
  5377 00002D62 C605[2A5E0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5378 00002D69 EB16                <1> 	jmp	short l_gfx_uc_4 	
  5379                              <1> l_gfx_uc_2:
  5380 00002D6B FECB                <1> 	dec	bl
  5381 00002D6D 740B                <1> 	jz	short l_gfx_uc_3 ; bl = 2
  5382 00002D6F FECB                <1> 	dec	bl
  5383 00002D71 750E                <1> 	jnz	short l_gfx_uc_4 ; bl > 3
  5384                              <1> 	; bl = 3
  5385                              <1> 	; case 3:
  5386                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5387                              <1> 	;    break;
  5388 00002D73 C605[2A5E0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5389                              <1> l_gfx_uc_3:
  5390                              <1>     	; case 2:
  5391                              <1>     	; default:
  5392                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5393                              <1> 	;    break;
  5394                              <1> 	; bl = 2 or bl > 3
  5395 00002D7A C605[2A5E0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5396                              <1>     	; }
  5397                              <1> l_gfx_uc_4:
  5398                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, CX);
  5399 00002D81 880D[265E0000]      <1> 	mov	[CHAR_HEIGHT], cl
  5400                              <1> 	; }
  5401 00002D87 C3                  <1> 	retn	
  5402                              <1> 
  5403                              <1> load_gfx_8_14_chars:
  5404                              <1> 	; 08/08/2016
  5405                              <1> 	; 10/07/2016
  5406                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  5407                              <1> 	;
  5408                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5409                              <1> 	; vgabios-0.7a (2011)
  5410                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5411                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_14_chars'
  5412                              <1> 
  5413                              <1> 	; biosfn_load_gfx_8_14_chars (BL)
  5414                              <1> 	; /* set 0x43 INT pointer */
  5415                              <1>     	; write_word(0x0, 0x43*4, &vgafont14);
  5416                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  5417 00002D88 C705[8E4F0100]-     <1> 	mov	dword [VGA_INT43H], vgafont14
  5417 00002D8E [5C1E0100]          <1>
  5418                              <1> 		
  5419                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  5420                              <1>         ;                         01H = 14 rows
  5421                              <1>         ;                         02H = 25 rows
  5422                              <1>         ;                         03H = 43 rows
  5423                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  5424                              <1> 
  5425                              <1> 	; switch (BL) {
  5426                              <1> 	; case 0:
  5427                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5428                              <1> 	;    break;
  5429 00002D92 20DB                <1> 	and	bl, bl
  5430 00002D94 7508                <1> 	jnz	short l_gfx_8_14c_1
  5431 00002D96 8815[2A5E0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5432 00002D9C EB23                <1> 	jmp	short l_gfx_8_14c_4 	
  5433                              <1> l_gfx_8_14c_1:
  5434                              <1> 	; case 1:
  5435                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5436                              <1> 	;    break;
  5437 00002D9E FECB                <1> 	dec	bl
  5438 00002DA0 7509                <1> 	jnz	short l_gfx_8_14c_2
  5439                              <1> 	; bl = 1
  5440 00002DA2 C605[2A5E0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5441 00002DA9 EB16                <1> 	jmp	short l_gfx_8_14c_4 	
  5442                              <1> l_gfx_8_14c_2:
  5443 00002DAB FECB                <1> 	dec	bl
  5444 00002DAD 740B                <1> 	jz	short l_gfx_8_14c_3 ; bl = 2
  5445 00002DAF FECB                <1> 	dec	bl
  5446 00002DB1 750E                <1> 	jnz	short l_gfx_8_14c_4 ; bl > 3
  5447                              <1> 	; bl = 3
  5448                              <1> 	; case 3:
  5449                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5450                              <1> 	;    break;
  5451 00002DB3 C605[2A5E0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5452                              <1> l_gfx_8_14c_3:
  5453                              <1>     	; case 2:
  5454                              <1>     	; default:
  5455                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5456                              <1> 	;    break;
  5457                              <1> 	; bl = 2 or bl > 3
  5458 00002DBA C605[2A5E0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5459                              <1>     	; }
  5460                              <1> l_gfx_8_14c_4:
  5461                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 14);
  5462 00002DC1 C605[265E0000]0E    <1>         mov     byte [CHAR_HEIGHT], 14
  5463                              <1> 	; }
  5464 00002DC8 C3                  <1> 	retn	
  5465                              <1> 
  5466                              <1> load_gfx_8_8_chars:
  5467                              <1> 	; 08/08/2016
  5468                              <1> 	; 10/07/2016
  5469                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  5470                              <1> 	;
  5471                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5472                              <1> 	; vgabios-0.7a (2011)
  5473                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5474                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_8_dd_chars'
  5475                              <1> 
  5476                              <1> 	; biosfn_load_gfx_8_8_dd_chars (BL)
  5477                              <1> 	; /* set 0x43 INT pointer */
  5478                              <1>     	; write_word(0x0, 0x43*4, &vgafont8);
  5479                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  5480 00002DC9 C705[8E4F0100]-     <1> 	mov	dword [VGA_INT43H], vgafont8
  5480 00002DCF [5C160100]          <1>
  5481                              <1> 		
  5482                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  5483                              <1>         ;                         01H = 14 rows
  5484                              <1>         ;                         02H = 25 rows
  5485                              <1>         ;                         03H = 43 rows
  5486                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  5487                              <1> 
  5488                              <1> 	; switch (BL) {
  5489                              <1> 	; case 0:
  5490                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5491                              <1> 	;    break;
  5492 00002DD3 20DB                <1> 	and	bl, bl
  5493 00002DD5 7508                <1> 	jnz	short l_gfx_8_8c_1
  5494 00002DD7 8815[2A5E0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5495 00002DDD EB23                <1> 	jmp	short l_gfx_8_8c_4 	
  5496                              <1> l_gfx_8_8c_1:
  5497                              <1> 	; case 1:
  5498                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5499                              <1> 	;    break;
  5500 00002DDF FECB                <1> 	dec	bl
  5501 00002DE1 7509                <1> 	jnz	short l_gfx_8_8c_2
  5502                              <1> 	; bl = 1
  5503 00002DE3 C605[2A5E0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5504 00002DEA EB16                <1> 	jmp	short l_gfx_8_8c_4 	
  5505                              <1> l_gfx_8_8c_2:
  5506 00002DEC FECB                <1> 	dec	bl
  5507 00002DEE 740B                <1> 	jz	short l_gfx_8_8c_3 ; bl = 2
  5508 00002DF0 FECB                <1> 	dec	bl
  5509 00002DF2 750E                <1> 	jnz	short l_gfx_8_8c_4 ; bl > 3
  5510                              <1> 	; bl = 3
  5511                              <1> 	; case 3:
  5512                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5513                              <1> 	;    break;
  5514 00002DF4 C605[2A5E0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5515                              <1> l_gfx_8_8c_3:
  5516                              <1>     	; case 2:
  5517                              <1>     	; default:
  5518                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5519                              <1> 	;    break;
  5520                              <1> 	; bl = 2 or bl > 3
  5521 00002DFB C605[2A5E0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5522                              <1>     	; }
  5523                              <1> l_gfx_8_8c_4:
  5524                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 8);
  5525 00002E02 C605[265E0000]08    <1>         mov     byte [CHAR_HEIGHT], 8
  5526                              <1> 	; }
  5527 00002E09 C3                  <1> 	retn
  5528                              <1> 
  5529                              <1> load_gfx_8_16_chars:
  5530                              <1> 	; 08/08/2016
  5531                              <1> 	; 10/07/2016
  5532                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  5533                              <1> 	;
  5534                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5535                              <1> 	; vgabios-0.7a (2011)
  5536                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5537                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_16_chars'
  5538                              <1> 
  5539                              <1> 	; biosfn_load_gfx_8_16_chars (BL)
  5540                              <1> 	; /* set 0x43 INT pointer */
  5541                              <1>     	; write_word(0x0, 0x43*4, &vgafont16);
  5542                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  5543 00002E0A C705[8E4F0100]-     <1> 	mov	dword [VGA_INT43H], vgafont16
  5543 00002E10 [5C2C0100]          <1>
  5544                              <1> 		
  5545                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  5546                              <1>         ;                         01H = 14 rows
  5547                              <1>         ;                         02H = 25 rows
  5548                              <1>         ;                         03H = 43 rows
  5549                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  5550                              <1> 
  5551                              <1> 	; switch (BL) {
  5552                              <1> 	; case 0:
  5553                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5554                              <1> 	;    break;
  5555 00002E14 20DB                <1> 	and	bl, bl
  5556 00002E16 7508                <1> 	jnz	short l_gfx_8_16c_1
  5557 00002E18 8815[2A5E0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5558 00002E1E EB23                <1> 	jmp	short l_gfx_8_16c_4 	
  5559                              <1> l_gfx_8_16c_1:
  5560                              <1> 	; case 1:
  5561                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5562                              <1> 	;    break;
  5563 00002E20 FECB                <1> 	dec	bl
  5564 00002E22 7509                <1> 	jnz	short l_gfx_8_16c_2
  5565                              <1> 	; bl = 1
  5566 00002E24 C605[2A5E0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5567 00002E2B EB16                <1> 	jmp	short l_gfx_8_16c_4 	
  5568                              <1> l_gfx_8_16c_2:
  5569 00002E2D FECB                <1> 	dec	bl
  5570 00002E2F 740B                <1> 	jz	short l_gfx_8_16c_3 ; bl = 2
  5571 00002E31 FECB                <1> 	dec	bl
  5572 00002E33 750E                <1> 	jnz	short l_gfx_8_16c_4 ; bl > 3
  5573                              <1> 	; bl = 3
  5574                              <1> 	; case 3:
  5575                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5576                              <1> 	;    break;
  5577 00002E35 C605[2A5E0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5578                              <1> l_gfx_8_16c_3:
  5579                              <1>     	; case 2:
  5580                              <1>     	; default:
  5581                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5582                              <1> 	;    break;
  5583                              <1> 	; bl = 2 or bl > 3
  5584 00002E3C C605[2A5E0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5585                              <1>     	; }
  5586                              <1> l_gfx_8_16c_4:
  5587                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 16);
  5588 00002E43 C605[265E0000]10    <1>         mov     byte [CHAR_HEIGHT], 16
  5589                              <1> 	; }
  5590 00002E4A C3                  <1> 	retn
  5591                              <1> 			
  5592                              <1> get_font_info:
  5593                              <1> 	; 19/09/2016
  5594                              <1> 	; 08/08/2016
  5595                              <1> 	; 10/07/2016
  5596                              <1> 	; Get Current Character Generator Info (VGA)
  5597                              <1> 	;
  5598                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5599                              <1> 	; vgabios-0.7a (2011)
  5600                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5601                              <1> 	; 'vgabios.c', 'biosfn_get_font_info'
  5602                              <1> 
  5603                              <1> 	; Modified for TRDOS 386 !
  5604                              <1> 	;
  5605                              <1> 	; INPUT ->
  5606                              <1> 	;    AX = 1130h
  5607                              <1> 	;    BL = 0 -> Get info for current VGA font
  5608                              <1> 	;	       (BH = unused)
  5609                              <1> 	;    19/09/2016
  5610                              <1> 	;    BL > 0 -> Get requested character font data
  5611                              <1> 	;	 BL = 1 -> vgafont8
  5612                              <1> 	;        BL = 2 -> vgafont14
  5613                              <1> 	;	 BL = 3 -> vgafont16   
  5614                              <1> 	;	 BL > 3 -> Invalid function (for now!)
  5615                              <1> 	;	 BH = ASCII code of the first character
  5616                              <1> 	;	 ECX = Number of characters from the 1st char
  5617                              <1> 	;	 ECX >= 256 -> All (256-BH) characters
  5618                              <1> 	;	 ECX = 0 -> All characters (BH = unused)	
  5619                              <1> 	;        EDX = User's Buffer Address	
  5620                              <1> 	; OUTPUT ->
  5621                              <1> 	;    AL = height (scanlines), bytes per character
  5622                              <1> 	;    AH = screen rows
  5623                              <1> 	;    Byte 16-23 of EAX = number of columns
  5624                              <1> 	;    Byte 24-31 of EAX = 
  5625                              <1> 	;	  0 -> default font (not configured yet)
  5626                              <1> 	;	  0FFh -> user defined font
  5627                              <1> 	;	  14 = vgafont14
  5628                              <1> 	;	   8 = vgafont8
  5629                              <1> 	;	  16 = vgafont16
  5630                              <1> 	;   If BL input > 0 -> 
  5631                              <1> 	;       EAX = Actual transfer count
  5632                              <1> 	;
  5633 00002E4B 20DB                <1> 	and	bl, bl
  5634 00002E4D 7408                <1> 	jz	short gfi_0
  5635                              <1> 	; invalid function (input)
  5636 00002E4F 80FB03              <1> 	cmp	bl, 3
  5637 00002E52 7642                <1> 	jna	short gfi_4
  5638 00002E54 31C0                <1> 	xor	eax, eax ; 0
  5639 00002E56 C3                  <1> 	retn
  5640                              <1> gfi_0:
  5641 00002E57 A0[265E0000]        <1> 	mov	al, [CHAR_HEIGHT]
  5642 00002E5C 8A25[2A5E0000]      <1> 	mov	ah, [VGA_ROWS]
  5643 00002E62 C1E010              <1> 	shl	eax, 16
  5644 00002E65 A0[245E0000]        <1> 	mov	al, [CRT_COLS]
  5645 00002E6A 8B0D[8E4F0100]      <1> 	mov	ecx, [VGA_INT43H]
  5646 00002E70 21C9                <1> 	and	ecx, ecx
  5647 00002E72 741E                <1> 	jz	short gfi_2 ; 0 = default font
  5648 00002E74 41                  <1> 	inc	ecx ; 0FFFFFFFFh -> 0 (user defined font)
  5649 00002E75 7504                <1> 	jnz	short gfi_1
  5650 00002E77 FECC                <1> 	dec	ah ; 0FFh
  5651 00002E79 EB17                <1> 	jmp	short gfi_2
  5652                              <1> gfi_1:
  5653 00002E7B 49                  <1> 	dec	ecx ; 08/08/2016
  5654 00002E7C B40E                <1> 	mov	ah, 14
  5655 00002E7E 81F9[5C1E0100]      <1> 	cmp	ecx, vgafont14
  5656 00002E84 740C                <1> 	je	short gfi_2
  5657 00002E86 B408                <1> 	mov	ah, 8
  5658 00002E88 81F9[5C160100]      <1> 	cmp	ecx, vgafont8
  5659 00002E8E 7402                <1> 	je	short gfi_2
  5660                              <1> 	; vgafont16
  5661 00002E90 D0E4                <1> 	shl	ah, 1 ; ah = 16
  5662                              <1> gfi_2:
  5663 00002E92 C1C010              <1> 	rol	eax, 16
  5664                              <1> gfi_3:
  5665 00002E95 C3                  <1> 	retn
  5666                              <1> gfi_4:
  5667 00002E96 89D7                <1> 	mov	edi, edx ; **
  5668 00002E98 80FB02              <1> 	cmp	bl, 2
  5669 00002E9B 720B                <1> 	jb	short gfi_5
  5670 00002E9D 772F                <1> 	ja	short gfi_7
  5671                              <1> 	;BL = 2 -> vgafont14
  5672 00002E9F BE[5C1E0100]        <1> 	mov	esi, vgafont14 ; *
  5673 00002EA4 B30E                <1> 	mov	bl, 14
  5674 00002EA6 EB07                <1> 	jmp	short gfi_6 
  5675                              <1> gfi_5:
  5676                              <1> 	;BL = 1 -> vgafont8
  5677 00002EA8 BE[5C160100]        <1> 	mov	esi, vgafont8 ; *
  5678 00002EAD B308                <1> 	mov	bl, 8
  5679                              <1> gfi_6:
  5680 00002EAF 09C9                <1> 	or	ecx, ecx
  5681 00002EB1 7424                <1> 	jz	short gfi_8 ; all chars from the 00h
  5682 00002EB3 88F8                <1> 	mov	al, bh ; character index
  5683 00002EB5 F6E3                <1> 	mul	bl ; char index * char height/size
  5684 00002EB7 0FB7D0              <1> 	movzx	edx, ax
  5685 00002EBA 01D6                <1> 	add	esi, edx ; *
  5686 00002EBC 66BAFF00            <1> 	mov	dx, 255
  5687 00002EC0 28FA                <1> 	sub	dl, bh
  5688 00002EC2 6642                <1> 	inc	dx	
  5689 00002EC4 39D1                <1> 	cmp	ecx, edx
  5690 00002EC6 770F                <1> 	ja	short gfi_8
  5691 00002EC8 7412                <1> 	je	short gfi_9
  5692 00002ECA 89D1                <1> 	mov	ecx, edx
  5693 00002ECC EB0E                <1> 	jmp	short gfi_9
  5694                              <1> gfi_7:
  5695                              <1> 	;BL = 3 -> vgafont16
  5696 00002ECE BE[5C2C0100]        <1> 	mov	esi, vgafont16 ; *
  5697 00002ED3 B310                <1> 	mov	bl, 16
  5698 00002ED5 EBD8                <1> 	jmp	short gfi_6
  5699                              <1> gfi_8:
  5700 00002ED7 B900010000          <1> 	mov	ecx, 256
  5701                              <1> gfi_9:
  5702 00002EDC 6689C8              <1> 	mov	ax, cx ; character count
  5703 00002EDF 30FF                <1> 	xor	bh, bh
  5704 00002EE1 66F7E3              <1> 	mul	bx ; char count * char height/size	
  5705 00002EE4 6689C1              <1>  	mov	cx, ax
  5706                              <1> 
  5707                              <1> 	; ESI = source address in system space
  5708                              <1> 	; EDI = user's buffer address
  5709                              <1> 	; ECX = transfer (byte) count
  5710 00002EE7 E8E0B80000          <1> 	call	transfer_to_user_buffer
  5711 00002EEC 89C8                <1> 	mov	eax, ecx ; actual transfer count
  5712 00002EEE C3                  <1> 	retn
  5713                              <1> 	
  5714                              <1> vga_pal_funcs:
  5715                              <1> 	; 10/08/2016
  5716                              <1> 	; VGA Palette functions
  5717                              <1> 	;
  5718                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5719                              <1> 	; vgabios-0.7a (2011)
  5720                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5721                              <1> 	; 'vgabios.c', 'vgarom.asm'
  5722                              <1> 
  5723 00002EEF 3C00                <1> 	cmp	al, 0
  5724 00002EF1 0F848F000000        <1>         je      set_single_palette_reg
  5725                              <1> vga_palf_1001:
  5726 00002EF7 3C01                <1> 	cmp	al, 1
  5727 00002EF9 0F84B4000000        <1>         je      set_overscan_border_color
  5728                              <1> vga_palf_1002:
  5729 00002EFF 3C02                <1> 	cmp	al, 2
  5730 00002F01 0F84B0000000        <1>         je      set_all_palette_reg
  5731                              <1> vga_palf_1003:
  5732 00002F07 3C03                <1> 	cmp	al, 3
  5733 00002F09 0F84E8000000        <1>         je      toggle_intensity
  5734                              <1> vga_palf_1007:
  5735 00002F0F 3C07                <1> 	cmp	al, 7
  5736 00002F11 0F840D010000        <1>         je      get_single_palette_reg
  5737 00002F17 7266                <1> 	jb	short vga_palf_unknown
  5738                              <1> vga_palf_1008:
  5739 00002F19 3C08                <1> 	cmp	al, 8
  5740 00002F1B 0F8437010000        <1>         je      read_overscan_border_color
  5741                              <1> vga_palf_1009:
  5742 00002F21 3C09                <1> 	cmp	al, 9
  5743 00002F23 0F8433010000        <1> 	je	get_all_palette_reg
  5744                              <1> vga_palf_1010:
  5745 00002F29 3C10                <1> 	cmp	al, 10h
  5746 00002F2B 0F8487010000        <1> 	je 	set_single_dac_reg
  5747 00002F31 724C                <1> 	jb	short vga_palf_unknown
  5748                              <1> vga_palf_1012:
  5749 00002F33 3C12                <1> 	cmp	al, 12h
  5750 00002F35 0F8498010000        <1>         je      set_all_dac_reg
  5751 00002F3B 7242                <1> 	jb	short vga_palf_unknown
  5752                              <1> vga_palf_1013:
  5753 00002F3D 3C13                <1> 	cmp	al, 13h
  5754 00002F3F 0F84CC010000        <1>         je      select_video_dac_color_page
  5755                              <1> vga_palf_1015:
  5756 00002F45 3C15                <1> 	cmp	al, 15h
  5757 00002F47 0F8412020000        <1> 	je	read_single_dac_reg
  5758 00002F4D 7230                <1> 	jb	short vga_palf_unknown
  5759                              <1> vga_palf_1017:
  5760 00002F4F 3C17                <1> 	cmp	al, 17h
  5761 00002F51 0F8428020000        <1>         je      read_all_dac_reg
  5762 00002F57 7226                <1> 	jb	short vga_palf_unknown
  5763                              <1> vga_palf_1018:
  5764 00002F59 3C18                <1> 	cmp	al, 18h
  5765 00002F5B 0F845E020000        <1>         je      set_pel_mask
  5766                              <1> vga_palf_1019:
  5767 00002F61 3C19                <1> 	cmp	al, 19h
  5768 00002F63 0F8462020000        <1>         je      read_pel_mask
  5769                              <1> vga_palf_101A:
  5770 00002F69 3C1A                <1> 	cmp	al, 1Ah
  5771 00002F6B 0F8468020000        <1>         je      read_video_dac_state
  5772                              <1> vga_palf_101B:
  5773 00002F71 3C1B                <1> 	cmp	al, 1Bh
  5774                              <1> 	;jne	short vga_palf_unknown
  5775 00002F73 770A                <1> 	ja	short vga_palf_unknown
  5776                              <1>  
  5777 00002F75 E80CF7FFFF          <1> 	call	gray_scale_summing
  5778 00002F7A E9D5E5FFFF          <1>         jmp     VIDEO_RETURN 	
  5779                              <1> 
  5780                              <1> vga_palf_unknown:
  5781 00002F7F 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  5782 00002F81 E9D3E5FFFF          <1>         jmp     _video_return
  5783                              <1> 
  5784                              <1> set_single_palette_reg:
  5785                              <1> 	; 10/08/2016
  5786                              <1> 	; Set One Palette Register
  5787                              <1> 	; BL = register number to set
  5788                              <1> 	;     (a 4-bit attribute nibble: 00h-0Fh)
  5789                              <1> 	; BH = 6-bit RGB color to display 
  5790                              <1> 	;      for that attribute
  5791                              <1> 
  5792 00002F86 80FB14              <1> 	cmp	bl, 14h
  5793                              <1> 	;ja	short no_actl_reg1
  5794 00002F89 0F87C5E5FFFF        <1> 	ja	VIDEO_RETURN
  5795 00002F8F 6650                <1> 	push	ax
  5796 00002F91 6652                <1> 	push	dx
  5797 00002F93 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5798 00002F97 EC                  <1> 	in	al, dx
  5799 00002F98 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5800 00002F9C 88D8                <1> 	mov	al, bl
  5801 00002F9E EE                  <1> 	out	dx, al
  5802 00002F9F 88F8                <1> 	mov	al, bh
  5803 00002FA1 EE                  <1> 	out	dx, al
  5804 00002FA2 B020                <1> 	mov	al, 20h
  5805 00002FA4 EE                  <1> 	out	dx, al
  5806                              <1> 	; ifdef VBOX
  5807 00002FA5 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5808 00002FA9 EC                  <1> 	in	al, dx
  5809                              <1> 	; endif ; VBOX
  5810 00002FAA 665A                <1> 	pop	dx
  5811 00002FAC 6658                <1> 	pop	ax
  5812                              <1> ;no_actl_reg1:
  5813 00002FAE E9A1E5FFFF          <1> 	jmp	VIDEO_RETURN
  5814                              <1> 
  5815                              <1> set_overscan_border_color:
  5816                              <1> 	; 10/08/2016
  5817                              <1> 	; Set Overscan/Border Color Register
  5818                              <1> 	; BH = 6-bit RGB color to display 
  5819                              <1> 	;      for that attribute
  5820                              <1> 	
  5821 00002FB3 B311                <1> 	mov	bl, 11h
  5822 00002FB5 EBCF                <1>   	jmp	short set_single_palette_reg
  5823                              <1> 
  5824                              <1> set_all_palette_reg:
  5825                              <1> 	; 10/08/2016
  5826                              <1> 	; Set All Palette Registers and Overscan
  5827                              <1> 	; EDX = Address of 17 bytes; 
  5828                              <1> 	; an rgbRGB value for each of 16 palette
  5829                              <1> 	; registers plus one for the border.
  5830                              <1> 
  5831 00002FB7 89D6                <1> 	mov	esi, edx ; user buffer
  5832 00002FB9 B911000000          <1> 	mov	ecx, 17
  5833 00002FBE 89E7                <1> 	mov	edi, esp
  5834 00002FC0 83EC14              <1> 	sub	esp, 20	 	 
  5835 00002FC3 E84EB80000          <1> 	call	transfer_from_user_buffer
  5836                              <1> 	;jc	VIDEO_RETURN
  5837                              <1> 
  5838 00002FC8 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5839 00002FCC EC                  <1> 	in	al, dx
  5840 00002FCD B100                <1> 	mov	cl, 0
  5841 00002FCF 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5842                              <1> set_palette_loop:
  5843 00002FD3 88C8                <1> 	mov	al, cl
  5844 00002FD5 EE                  <1> 	out	dx, al
  5845 00002FD6 8A07                <1> 	mov	al, [edi]
  5846 00002FD8 EE                  <1> 	out	dx, al
  5847 00002FD9 47                  <1> 	inc	edi
  5848 00002FDA FEC1                <1> 	inc	cl
  5849 00002FDC 80F910              <1> 	cmp	cl, 10h
  5850 00002FDF 75F2                <1> 	jne	short set_palette_loop
  5851 00002FE1 B011                <1> 	mov	al, 11h
  5852 00002FE3 EE                  <1> 	out	dx, al
  5853 00002FE4 8A07                <1> 	mov	al, [edi]
  5854 00002FE6 EE                  <1> 	out	dx, al
  5855 00002FE7 B020                <1> 	mov	al, 20h
  5856 00002FE9 EE                  <1> 	out	dx, al
  5857                              <1> 	; ifdef VBOX
  5858 00002FEA 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5859 00002FEE EC                  <1> 	in	al, dx
  5860                              <1> 	; endif ; VBOX
  5861 00002FEF 83C414              <1> 	add	esp, 20
  5862 00002FF2 E95DE5FFFF          <1> 	jmp	VIDEO_RETURN
  5863                              <1> 
  5864                              <1> toggle_intensity:
  5865                              <1> 	; 10/08/2016
  5866                              <1> 	; Select Foreground Blink or Bold Background
  5867                              <1> 	; BL = 00h = enable bold backgrounds
  5868                              <1> 	;	    (16 background colors)
  5869                              <1>         ;      01h = enable blinking foreground
  5870                              <1> 	;	    (8 background colors)
  5871                              <1> 
  5872 00002FF7 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5873 00002FFB EC                  <1> 	in	al, dx
  5874 00002FFC 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5875 00003000 B010                <1> 	mov	al, 10h
  5876 00003002 EE                  <1> 	out	dx, al
  5877 00003003 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5878 00003007 EC                  <1> 	in	al, dx
  5879 00003008 24F7                <1> 	and	al, 0F7h
  5880 0000300A 80E301              <1> 	and	bl, 01h
  5881 0000300D C0E303              <1> 	shl	bl, 3
  5882 00003010 08D8                <1> 	or	al, bl
  5883 00003012 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5884 00003016 EE                  <1> 	out	dx, al
  5885 00003017 B020                <1> 	mov	al, 20h
  5886 00003019 EE                  <1> 	out	dx, al
  5887                              <1> 	; ifdef VBOX
  5888 0000301A 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5889 0000301E EC                  <1> 	in	al, dx
  5890                              <1> 	; endif ; VBOX
  5891 0000301F E930E5FFFF          <1> 	jmp	VIDEO_RETURN
  5892                              <1> 
  5893                              <1> get_single_palette_reg:
  5894                              <1> 	; 10/08/2016
  5895                              <1> 	; Read One Palette Register
  5896                              <1>         ; INPUT:
  5897                              <1> 	; BL = Palette register to read (00h-0Fh)
  5898                              <1> 	; OUTPUT:
  5899                              <1> 	; BH = Current rgbRGB value of specified register
  5900                              <1> 	;      for that attribute
  5901                              <1> 
  5902 00003024 80FB14              <1> 	cmp	bl, 14h
  5903                              <1> 	;ja	short no_actl_reg2
  5904 00003027 0F8727E5FFFF        <1> 	ja	VIDEO_RETURN
  5905                              <1> 
  5906 0000302D 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5907 00003031 EC                  <1> 	in	al, dx
  5908 00003032 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5909 00003036 88D8                <1> 	mov	al, bl
  5910 00003038 EE                  <1> 	out	dx, al
  5911 00003039 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5912 0000303D EC                  <1> 	in	al, dx
  5913 0000303E 8844240D            <1> 	mov	[esp+13], al ; bh
  5914 00003042 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5915 00003046 EC                  <1> 	in	al, dx
  5916 00003047 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5917 0000304B B020                <1> 	mov	al, 20h
  5918 0000304D EE                  <1> 	out	dx, al
  5919                              <1> 	; ifdef VBOX
  5920 0000304E 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5921 00003052 EC                  <1> 	in	al, dx
  5922                              <1> 	; endif ; VBOX
  5923 00003053 E9FCE4FFFF          <1> 	jmp	VIDEO_RETURN
  5924                              <1> 
  5925                              <1> read_overscan_border_color:
  5926                              <1> 	; 10/08/2016
  5927                              <1> 	; Read Overscan Register
  5928                              <1> 	; OUTPUT:
  5929                              <1> 	; BH = current rgbRGB value 
  5930                              <1> 	;      of the overscan/border register
  5931                              <1> 
  5932 00003058 B311                <1> 	mov	bl, 11h
  5933 0000305A EBC8                <1> 	jmp	short get_single_palette_reg
  5934                              <1> 
  5935                              <1> get_all_palette_reg:
  5936                              <1> 	; 10/08/2016
  5937                              <1> 	; Read All Palette Registers
  5938                              <1> 	; EDX = Address of 17-byte buffer 
  5939                              <1> 	;	to receive data
  5940                              <1> 	
  5941 0000305C 89D7                <1> 	mov	edi, edx
  5942 0000305E 89E3                <1> 	mov	ebx, esp
  5943 00003060 89DE                <1> 	mov	esi, ebx
  5944 00003062 83EC14              <1> 	sub	esp, 20	 
  5945                              <1> 
  5946 00003065 B100                <1> 	mov	cl, 0
  5947                              <1> get_palette_loop:
  5948 00003067 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5949 0000306B EC                  <1> 	in	al, dx
  5950 0000306C 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5951 00003070 88C8                <1> 	mov	al, cl
  5952 00003072 EE                  <1> 	out	dx, al
  5953 00003073 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5954 00003077 EC                  <1> 	in	al, dx
  5955 00003078 8803                <1> 	mov	[ebx], al
  5956 0000307A 43                  <1> 	inc	ebx
  5957 0000307B FEC1                <1> 	inc	cl
  5958 0000307D 80F910              <1> 	cmp	cl, 10h
  5959 00003080 75E5                <1> 	jne	short get_palette_loop
  5960 00003082 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5961 00003086 EC                  <1> 	in	al, dx
  5962 00003087 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5963 0000308B B011                <1> 	mov	al, 11h
  5964 0000308D EE                  <1> 	out	dx, al
  5965 0000308E 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5966 00003092 EC                  <1> 	in	al, dx
  5967 00003093 8803                <1> 	mov	[ebx], al
  5968 00003095 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5969 00003099 EC                  <1> 	in	al, dx
  5970 0000309A 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5971 0000309E B020                <1> 	mov	al, 20h
  5972 000030A0 EE                  <1> 	out	dx, al
  5973                              <1> 	; ifdef VBOX
  5974 000030A1 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5975 000030A5 EC                  <1> 	in	al, dx
  5976                              <1> 	; endif ; VBOX
  5977                              <1> 
  5978 000030A6 B911000000          <1> 	mov	ecx, 17 ; transfer (byte) count
  5979                              <1> 	; ESI = source address in system space
  5980                              <1> 	; EDI = user's buffer address
  5981 000030AB E81CB70000          <1> 	call	transfer_to_user_buffer
  5982                              <1> 
  5983 000030B0 83C414              <1> 	add	esp, 20
  5984 000030B3 E99CE4FFFF          <1> 	jmp	VIDEO_RETURN
  5985                              <1> 
  5986                              <1> set_single_dac_reg:
  5987                              <1> 	; 10/08/2016
  5988                              <1> 	; Set One DAC Color Register
  5989                              <1> 	; BX = color register to set (0-255)
  5990                              <1>         ; CH = green value (00h-3Fh)
  5991                              <1>         ; CL = blue value  (00h-3Fh)
  5992                              <1>         ; DH = red value   (00h-3Fh)
  5993                              <1> 
  5994 000030B8 6652                <1> 	push	dx
  5995 000030BA 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  5996 000030BE 88D8                <1> 	mov	al, bl
  5997 000030C0 EE                  <1> 	out	dx, al
  5998                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  5999 000030C1 6642                <1> 	inc	dx
  6000 000030C3 6658                <1> 	pop	ax
  6001 000030C5 88E0                <1> 	mov	al, ah
  6002 000030C7 EE                  <1> 	out	dx, al
  6003 000030C8 88E8                <1> 	mov	al, ch
  6004 000030CA EE                  <1> 	out	dx, al
  6005 000030CB 88C8                <1> 	mov	al, cl
  6006 000030CD EE                  <1> 	out	dx, al
  6007 000030CE E981E4FFFF          <1> 	jmp	VIDEO_RETURN
  6008                              <1> 
  6009                              <1> set_all_dac_reg:
  6010                              <1> 	; 12/08/2016
  6011                              <1> 	; 11/08/2016
  6012                              <1> 	; 10/08/2016
  6013                              <1> 	; Set a Block of DAC Color Register
  6014                              <1> 	; BX = first DAC register to set (0-00FFh)
  6015                              <1> 	; ECX = number of registers to set (0-00FFh)
  6016                              <1> 	; EDX = addr of a table of R,G,B values 
  6017                              <1> 	;	(it will be CX*3 bytes long)
  6018                              <1> 
  6019 000030D3 89D6                <1> 	mov	esi, edx ; user buffer
  6020 000030D5 89CA                <1> 	mov	edx, ecx
  6021 000030D7 66D1E1              <1> 	shl	cx, 1 ; *2
  6022 000030DA 01D1                <1> 	add	ecx, edx ; ecx = 3*ecx
  6023 000030DC 89E5                <1> 	mov	ebp, esp
  6024 000030DE 89EF                <1> 	mov	edi, ebp
  6025 000030E0 29CF                <1> 	sub	edi, ecx
  6026 000030E2 6683E7FC            <1> 	and	di, 0FFFCh ; (dword alignment)
  6027 000030E6 89FC                <1> 	mov	esp, edi
  6028 000030E8 E829B70000          <1> 	call	transfer_from_user_buffer
  6029                              <1> 	;jc	VIDEO_RETURN
  6030                              <1> 
  6031 000030ED 89D1                <1> 	mov	ecx, edx
  6032 000030EF 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  6033 000030F3 88D8                <1> 	mov	al, bl
  6034 000030F5 EE                  <1> 	out	dx, al
  6035 000030F6 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6036                              <1> set_dac_loop:
  6037 000030FA 8A07                <1> 	mov	al, [edi]
  6038 000030FC EE                  <1> 	out	dx, al
  6039 000030FD 47                  <1> 	inc	edi
  6040 000030FE 8A07                <1> 	mov	al, [edi]
  6041 00003100 EE                  <1> 	out	dx, al
  6042 00003101 47                  <1> 	inc	edi
  6043 00003102 8A07                <1> 	mov	al, [edi]
  6044 00003104 EE                  <1> 	out	dx, al
  6045 00003105 47                  <1> 	inc	edi
  6046 00003106 6649                <1> 	dec	cx
  6047 00003108 75F0                <1> 	jnz	short set_dac_loop
  6048 0000310A 89EC                <1> 	mov	esp, ebp
  6049 0000310C E943E4FFFF          <1> 	jmp	VIDEO_RETURN
  6050                              <1> 
  6051                              <1> select_video_dac_color_page:
  6052                              <1> 	; 10/08/2016
  6053                              <1> 	; DAC Color Paging Functions
  6054                              <1> 	; BL = 00H = select color paging mode
  6055                              <1>         ;       BH = paging mode
  6056                              <1>         ;            00h = 4 blocks of 64 registers
  6057                              <1>         ;            01h = 16 blocks of 16 registers
  6058                              <1> 	; BL = 01H = activate color page
  6059                              <1>         ;       BH = DAC color page number
  6060                              <1>         ;            00h-03h (4-page/64-reg mode)
  6061                              <1>         ;            00h-0Fh (16-page/16-reg mode)
  6062                              <1> 
  6063 00003111 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6064 00003115 EC                  <1> 	in	al, dx
  6065 00003116 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6066 0000311A B010                <1> 	mov	al, 10h
  6067 0000311C EE                  <1> 	out	dx, al
  6068 0000311D 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6069 00003121 EC                  <1> 	in	al, dx
  6070 00003122 80E301              <1> 	and	bl, 01h
  6071 00003125 750E                <1> 	jnz	short set_dac_page
  6072 00003127 247F                <1> 	and	al, 07Fh
  6073 00003129 C0E707              <1> 	shl	bh, 7
  6074 0000312C 08F8                <1> 	or	al, bh
  6075 0000312E 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6076 00003132 EE                  <1> 	out	dx, al
  6077 00003133 EB1D                <1> 	jmp	short set_actl_normal
  6078                              <1> set_dac_page:
  6079 00003135 6650                <1> 	push	ax
  6080 00003137 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6081 0000313B EC                  <1> 	in	al, dx
  6082 0000313C 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6083 00003140 B014                <1> 	mov	al, 14h
  6084 00003142 EE                  <1> 	out	dx, al
  6085 00003143 6658                <1> 	pop	ax
  6086 00003145 2480                <1> 	and	al, 80h
  6087 00003147 7503                <1> 	jnz	short set_dac_16_page
  6088 00003149 C0E702              <1> 	shl	bh, 2
  6089                              <1> set_dac_16_page:
  6090 0000314C 80E70F              <1> 	and	bh, 0Fh
  6091 0000314F 88F8                <1> 	mov	al, bh
  6092 00003151 EE                  <1> 	out	dx, al
  6093                              <1> set_actl_normal:
  6094 00003152 B020                <1> 	mov	al, 20h
  6095 00003154 EE                  <1> 	out	dx, al
  6096                              <1> 	; ifdef VBOX
  6097 00003155 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6098 00003159 EC                  <1> 	in	al, dx
  6099                              <1> 	; endif ; VBOX
  6100 0000315A E9F5E3FFFF          <1> 	jmp	VIDEO_RETURN	
  6101                              <1> 
  6102                              <1> read_single_dac_reg:
  6103                              <1> 	; 10/08/2016
  6104                              <1> 	; Read One DAC Color Register
  6105                              <1> 	; INPUT:
  6106                              <1> 	; BX = color register to read (0-255)
  6107                              <1> 	; OUTPUT:
  6108                              <1> 	; CH = green value (00h-3Fh)
  6109                              <1>         ; CL = blue value  (00h-3Fh)
  6110                              <1>         ; DH = red value   (00h-3Fh)
  6111                              <1> 
  6112 0000315F 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  6113 00003163 88D8                <1> 	mov	al, bl
  6114 00003165 EE                  <1> 	out	dx, al
  6115 00003166 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6116 0000316A EC                  <1> 	in	al, dx
  6117 0000316B 88442415            <1> 	mov	[esp+21], al ; dh
  6118 0000316F EC                  <1> 	in	al, dx
  6119 00003170 88C5                <1> 	mov	ch, al
  6120 00003172 EC                  <1> 	in	al, dx
  6121 00003173 88C1                <1> 	mov	cl, al
  6122 00003175 66894C2410          <1> 	mov	[esp+16], cx ; cx
  6123 0000317A E9D5E3FFFF          <1> 	jmp	VIDEO_RETURN	
  6124                              <1> 
  6125                              <1> read_all_dac_reg:
  6126                              <1> 	; 12/08/2016
  6127                              <1> 	; 11/08/2016
  6128                              <1> 	; 10/08/2016
  6129                              <1> 	; Read a Block of DAC Color Registers
  6130                              <1>         ; BX = first DAC register to read (0-00FFh)
  6131                              <1>         ; ECX = number of registers to read (0-00FFh)
  6132                              <1>         ; EDX = addr of a buffer to hold R,G,B values
  6133                              <1> 	;	(CX*3 bytes long)
  6134                              <1> 
  6135 0000317F 89D7                <1> 	mov	edi, edx ; user buffer
  6136 00003181 89CA                <1> 	mov	edx, ecx
  6137 00003183 66D1E2              <1> 	shl	dx, 1 ; *2
  6138 00003186 01CA                <1> 	add	edx, ecx ; edx = 3*ecx
  6139 00003188 89E5                <1> 	mov	ebp, esp
  6140 0000318A 89EE                <1> 	mov	esi, ebp
  6141 0000318C 29D6                <1> 	sub	esi, edx
  6142 0000318E 6683E6FC            <1> 	and	si, 0FFFCh ; (dword alignment)
  6143 00003192 89F4                <1> 	mov	esp, esi
  6144 00003194 52                  <1> 	push	edx ; 3*ecx
  6145 00003195 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  6146 00003199 88D8                <1> 	mov	al, bl
  6147 0000319B EE                  <1> 	out	dx, al
  6148 0000319C 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6149 000031A0 89F3                <1> 	mov	ebx, esi
  6150                              <1> read_dac_loop:
  6151 000031A2 EC                  <1> 	in	al, dx
  6152 000031A3 8803                <1> 	mov	[ebx], al
  6153 000031A5 43                  <1> 	inc	ebx
  6154 000031A6 EC                  <1> 	in	al, dx
  6155 000031A7 8803                <1> 	mov	[ebx], al
  6156 000031A9 43                  <1> 	inc	ebx
  6157 000031AA EC                  <1> 	in	al, dx
  6158 000031AB 8803                <1> 	mov	[ebx], al
  6159 000031AD 43                  <1> 	inc	ebx
  6160 000031AE 6649                <1> 	dec	cx
  6161 000031B0 75F0                <1> 	jnz	short read_dac_loop
  6162 000031B2 59                  <1> 	pop	ecx ; 3*ecx
  6163                              <1> 	; ECX = transfer (byte) count
  6164                              <1> 	; ESI = source address in system space
  6165                              <1> 	; EDI = user's buffer address
  6166 000031B3 E814B60000          <1> 	call	transfer_to_user_buffer
  6167 000031B8 89EC                <1> 	mov	esp, ebp
  6168 000031BA E995E3FFFF          <1> 	jmp	VIDEO_RETURN
  6169                              <1> 
  6170                              <1> set_pel_mask:
  6171                              <1> 	; 10/08/2016
  6172                              <1> 	; BL = mask value
  6173 000031BF 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  6174 000031C3 88D8                <1> 	mov	al, bl
  6175 000031C5 EE                  <1> 	out	dx, al
  6176 000031C6 E989E3FFFF          <1> 	jmp	VIDEO_RETURN
  6177                              <1> 
  6178                              <1> read_pel_mask:
  6179                              <1> 	; 10/08/2016
  6180                              <1> 	; Output: BL = mask value 
  6181 000031CB 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  6182 000031CF EC                  <1> 	in	al, dx
  6183 000031D0 8844240C            <1> 	mov	[esp+12], al ; bl
  6184 000031D4 E97BE3FFFF          <1> 	jmp	VIDEO_RETURN
  6185                              <1> 
  6186                              <1> read_video_dac_state:
  6187                              <1> 	; 10/08/2016
  6188                              <1> 	; Query DAC Color Paging State
  6189                              <1> 	; Output:
  6190                              <1> 	; BH = current active DAC color page
  6191                              <1>         ; BL = current active DAC paging mode
  6192                              <1> 
  6193 000031D9 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6194 000031DD EC                  <1> 	in	al, dx
  6195 000031DE 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6196 000031E2 B010                <1> 	mov	al, 10h
  6197 000031E4 EE                  <1> 	out	dx, al
  6198 000031E5 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6199 000031E9 EC                  <1> 	in	al, dx
  6200 000031EA 88C3                <1> 	mov	bl, al
  6201 000031EC C0EB07              <1> 	shr	bl, 7
  6202 000031EF 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6203 000031F3 EC                  <1> 	in	al, dx
  6204 000031F4 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6205 000031F8 B014                <1> 	mov	al, 14h
  6206 000031FA EE                  <1> 	out	dx, al
  6207 000031FB 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6208 000031FF EC                  <1> 	in	al, dx
  6209 00003200 88C7                <1> 	mov	bh, al
  6210 00003202 80E70F              <1> 	and	bh, 0Fh
  6211 00003205 F6C301              <1> 	test	bl, 01
  6212 00003208 7503                <1> 	jnz	short get_dac_16_page
  6213 0000320A C0EF02              <1> 	shr	bh, 2
  6214                              <1> get_dac_16_page:
  6215 0000320D 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6216 00003211 EC                  <1> 	in	al, dx
  6217 00003212 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6218 00003216 B020                <1> 	mov	al, 20h
  6219 00003218 EE                  <1> 	out	dx, al
  6220                              <1> 	; ifdef VBOX
  6221 00003219 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6222 0000321D EC                  <1> 	in	al, dx
  6223                              <1> 	; endif ; VBOX 
  6224 0000321E 66895C240C          <1> 	mov	[esp+12], bx ; bx
  6225 00003223 E92CE3FFFF          <1> 	jmp	VIDEO_RETURN
  6226                              <1> 
  6227                              <1> ; % include 'vidata.s' ; VIDEO DATA
  6228                              <1> 
  6229                              <1> ; /// End Of VIDEO FUNCTIONS ///
  1941                                  
  1942                                  setup_rtc_int:
  1943                                  ; source: http://wiki.osdev.org/RTC
  1944 00003228 FA                      	cli		; disable interrupts
  1945                                  	; default int frequency is 1024 Hz (Lower 4 bits of register A is 0110b or 6)
  1946                                  	; in order to change this ...
  1947                                  	; frequency  = 32768 >> (rate-1) --> 32768 >> 5 = 1024
  1948                                  	; (rate must be above 2 and not over 15)
  1949                                  	; new rate = 15 --> 32768 >> (15-1) = 2 Hz
  1950 00003229 B08A                    	mov	al, 8Ah 
  1951 0000322B E670                    	out	70h, al ; set index to register A, disable NMI
  1952 0000322D 90                      	nop
  1953 0000322E E471                    	in	al, 71h ; get initial value of register A
  1954 00003230 88C4                    	mov 	ah, al
  1955 00003232 80E4F0                  	and	ah, 0F0h
  1956 00003235 B08A                    	mov	al, 8Ah 
  1957 00003237 E670                    	out	70h, al ; reset index to register A
  1958 00003239 88E0                    	mov	al, ah
  1959 0000323B 0C0F                    	or	al, 0Fh	; new rate (0Fh -> 15)
  1960 0000323D E671                    	out	71h, al ; write only our rate to A. Note, rate is the bottom 4 bits. 
  1961                                  	; enable RTC interrupt
  1962 0000323F B08B                    	mov	al, 8Bh ;
  1963 00003241 E670                    	out	70h, al ; select register B and disable NMI
  1964 00003243 90                      	nop
  1965 00003244 E471                    	in	al, 71h ; read the current value of register B
  1966 00003246 88C4                    	mov	ah, al  ;
  1967 00003248 B08B                    	mov 	al, 8Bh ;
  1968 0000324A E670                    	out	70h, al ; set the index again (a read will reset the index to register B)	
  1969 0000324C 88E0                    	mov	al, ah  ;
  1970 0000324E 0C40                    	or	al, 40h ;
  1971 00003250 E671                    	out	71h, al ; write the previous value ORed with 0x40. This turns on bit 6 of register B
  1972 00003252 FB                      	sti
  1973 00003253 C3                      	retn
  1974                                  
  1975                                  ; Write memory information
  1976                                  ; 29/01/2016
  1977                                  ; 06/11/2014
  1978                                  ; 14/08/2015 
  1979                                  memory_info:	
  1980 00003254 A1[E4410100]            	mov	eax, [memory_size] ; in pages
  1981 00003259 50                      	push	eax
  1982 0000325A C1E00C                  	shl	eax, 12		   ; in bytes
  1983 0000325D BB0A000000              	mov	ebx, 10
  1984 00003262 89D9                    	mov	ecx, ebx	   ; 10
  1985 00003264 BE[A90A0100]            	mov	esi, mem_total_b_str	
  1986 00003269 E8BD000000              	call	bintdstr
  1987 0000326E 58                      	pop	eax
  1988 0000326F B107                    	mov	cl, 7
  1989 00003271 BE[CD0A0100]            	mov	esi, mem_total_p_str
  1990 00003276 E8B0000000              	call	bintdstr	
  1991                                  	; 14/08/2015
  1992 0000327B E8C8000000              	call	calc_free_mem
  1993                                  	; edx = calculated free pages
  1994                                  	; ecx = 0
  1995 00003280 A1[E8410100]            	mov 	eax, [free_pages]
  1996 00003285 39D0                    	cmp	eax, edx ; calculated free mem value 
  1997                                  		; and initial free mem value are same or not?
  1998 00003287 751D                    	jne 	short pmim ; print mem info with '?' if not
  1999 00003289 52                      	push 	edx ; free memory in pages	
  2000                                  	;mov 	eax, edx
  2001 0000328A C1E00C                  	shl	eax, 12 ; convert page count
  2002                                  			; to byte count
  2003 0000328D B10A                    	mov	cl, 10
  2004 0000328F BE[ED0A0100]            	mov	esi, free_mem_b_str
  2005 00003294 E892000000              	call	bintdstr
  2006 00003299 58                      	pop	eax
  2007 0000329A B107                    	mov	cl, 7
  2008 0000329C BE[110B0100]            	mov	esi, free_mem_p_str
  2009 000032A1 E885000000              	call	bintdstr
  2010                                  pmim:
  2011 000032A6 BE[970A0100]            	mov	esi, msg_memory_info
  2012                                  	;
  2013 000032AB B407                    	mov	ah, 07h ; Black background, 
  2014                                  			; light gray forecolor
  2015                                  print_kmsg: ; 29/01/2016
  2016 000032AD 8825[0F420100]          	mov	[ccolor], ah
  2017                                  pkmsg_loop:
  2018 000032B3 AC                      	lodsb
  2019 000032B4 08C0                    	or	al, al
  2020 000032B6 7410                    	jz	short pkmsg_ok
  2021 000032B8 56                      	push	esi
  2022                                  	; 13/05/2016
  2023 000032B9 0FB61D[0F420100]        	movzx	ebx, byte [ccolor]
  2024                                  			; Video page 0 (bh=0)
  2025 000032C0 E8EDE9FFFF              	call	_write_tty
  2026 000032C5 5E                      	pop	esi
  2027 000032C6 EBEB                    	jmp	short pkmsg_loop
  2028                                  pkmsg_ok:
  2029 000032C8 C3                      	retn
  2030                                  
  2031                                  ; Convert binary number to hexadecimal string
  2032                                  ; 10/05/2015  
  2033                                  ; dsectpm.s (28/02/2015)
  2034                                  ; Retro UNIX 386 v1 - Kernel v0.2.0.6  
  2035                                  ; 01/12/2014
  2036                                  ; 25/11/2014
  2037                                  ;
  2038                                  bytetohex:
  2039                                  	; INPUT ->
  2040                                  	; 	AL = byte (binary number)
  2041                                  	; OUTPUT ->
  2042                                  	;	AX = hexadecimal string
  2043                                  	;
  2044 000032C9 53                      	push	ebx
  2045 000032CA 31DB                    	xor	ebx, ebx
  2046 000032CC 88C3                    	mov	bl, al
  2047 000032CE C0EB04                  	shr	bl, 4
  2048 000032D1 8A9B[1B330000]          	mov	bl, [ebx+hexchrs] 	 	
  2049 000032D7 86D8                    	xchg	bl, al
  2050 000032D9 80E30F                  	and	bl, 0Fh
  2051 000032DC 8AA3[1B330000]          	mov	ah, [ebx+hexchrs] 
  2052 000032E2 5B                      	pop	ebx	
  2053 000032E3 C3                      	retn
  2054                                  
  2055                                  wordtohex:
  2056                                  	; INPUT ->
  2057                                  	; 	AX = word (binary number)
  2058                                  	; OUTPUT ->
  2059                                  	;	EAX = hexadecimal string
  2060                                  	;
  2061 000032E4 53                      	push	ebx
  2062 000032E5 31DB                    	xor	ebx, ebx
  2063 000032E7 86E0                    	xchg	ah, al
  2064 000032E9 6650                    	push	ax
  2065 000032EB 88E3                    	mov	bl, ah
  2066 000032ED C0EB04                  	shr	bl, 4
  2067 000032F0 8A83[1B330000]          	mov	al, [ebx+hexchrs] 	 	
  2068 000032F6 88E3                    	mov	bl, ah
  2069 000032F8 80E30F                  	and	bl, 0Fh
  2070 000032FB 8AA3[1B330000]          	mov	ah, [ebx+hexchrs]
  2071 00003301 C1E010                  	shl	eax, 16
  2072 00003304 6658                    	pop	ax
  2073 00003306 5B                      	pop	ebx
  2074 00003307 EBC0                    	jmp	short bytetohex
  2075                                  	;mov	bl, al
  2076                                  	;shr	bl, 4
  2077                                  	;mov	bl, [ebx+hexchrs] 	 	
  2078                                  	;xchg	bl, al	 	
  2079                                  	;and	bl, 0Fh
  2080                                  	;mov	ah, [ebx+hexchrs] 
  2081                                  	;pop	ebx	
  2082                                  	;retn
  2083                                  
  2084                                  dwordtohex:
  2085                                  	; INPUT ->
  2086                                  	; 	EAX = dword (binary number)
  2087                                  	; OUTPUT ->
  2088                                  	;	EDX:EAX = hexadecimal string
  2089                                  	;
  2090 00003309 50                      	push	eax
  2091 0000330A C1E810                  	shr	eax, 16
  2092 0000330D E8D2FFFFFF              	call	wordtohex
  2093 00003312 89C2                    	mov	edx, eax
  2094 00003314 58                      	pop	eax
  2095 00003315 E8CAFFFFFF              	call	wordtohex
  2096 0000331A C3                      	retn
  2097                                  
  2098                                  ; 10/05/2015
  2099                                  hex_digits:
  2100                                  hexchrs:
  2101 0000331B 303132333435363738-     	db '0123456789ABCDEF'
  2101 00003324 39414243444546     
  2102                                  
  2103                                  ; Convert binary number to decimal/numeric string
  2104                                  ; 06/11/2014
  2105                                  ; Temporary Code
  2106                                  ;
  2107                                  
  2108                                  bintdstr:
  2109                                  	; EAX = binary number
  2110                                  	; ESI = decimal/numeric string address
  2111                                  	; EBX = divisor (10)
  2112                                  	; ECX = string length (<=10)
  2113 0000332B 01CE                    	add	esi, ecx
  2114                                  btdstr0:
  2115 0000332D 4E                      	dec	esi
  2116 0000332E 31D2                    	xor	edx, edx
  2117 00003330 F7F3                    	div	ebx
  2118 00003332 80C230                  	add	dl, 30h
  2119 00003335 8816                    	mov	[esi], dl
  2120 00003337 FEC9                    	dec	cl
  2121 00003339 740C                    	jz	short btdstr2 ; 08/09/2016
  2122 0000333B 09C0                    	or	eax, eax
  2123 0000333D 75EE                    	jnz	short btdstr0
  2124                                  btdstr1:
  2125 0000333F 4E                      	dec	esi
  2126 00003340 C60620                          mov     byte [esi], 20h ; blank space
  2127 00003343 FEC9                    	dec	cl
  2128 00003345 75F8                    	jnz	short btdstr1
  2129                                  btdstr2:
  2130 00003347 C3                      	retn
  2131                                  
  2132                                  ; Calculate free memory pages on M.A.T.
  2133                                  ; 06/11/2014
  2134                                  ; Temporary Code
  2135                                  ;
  2136                                  
  2137                                  calc_free_mem:
  2138 00003348 31D2                    	xor	edx, edx
  2139                                  	;xor	ecx, ecx
  2140 0000334A 668B0D[F8410100]        	mov	cx, [mat_size] ; in pages
  2141 00003351 C1E10A                  	shl	ecx, 10	; 1024 dwords per page
  2142 00003354 BE00001000              	mov	esi, MEM_ALLOC_TBL
  2143                                  cfm0:
  2144 00003359 AD                      	lodsd
  2145 0000335A 51                      	push	ecx
  2146 0000335B B920000000              	mov	ecx, 32
  2147                                  cfm1:
  2148 00003360 D1E8                    	shr	eax, 1
  2149 00003362 7301                    	jnc	short cfm2
  2150 00003364 42                      	inc	edx
  2151                                  cfm2:
  2152 00003365 E2F9                    	loop	cfm1
  2153 00003367 59                      	pop	ecx
  2154 00003368 E2EF                    	loop	cfm0
  2155 0000336A C3                      	retn
  2156                                  
  2157                                  %include 'diskio.s'  ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - diskio.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 15/01/2017
     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 0000336B 9C                  <1> 	pushfd
    31 0000336C 0E                  <1> 	push 	cs
    32 0000336D E809000000          <1> 	call 	DISKETTE_IO_1
    33 00003372 C3                  <1> 	retn
    34                              <1> 	
    35                              <1> ;;;;;; DISKETTE I/O ;;;;;;;;;;;;;;;;;;;; 06/02/2015 ;;;
    36                              <1> ;//////////////////////////////////////////////////////
    37                              <1> 
    38                              <1> ; DISKETTE I/O - Erdogan Tan (Retro UNIX 386 v1 project)
    39                              <1> ; 20/02/2015
    40                              <1> ; 06/02/2015 (unix386.s)
    41                              <1> ; 16/12/2014 - 02/01/2015 (dsectrm2.s)
    42                              <1> ;
    43                              <1> ; Code (DELAY) modifications - AWARD BIOS 1999 (ADISK.EQU, COMMON.MAC)
    44                              <1> ;
    45                              <1> ; ADISK.EQU
    46                              <1> 
    47                              <1> ;----- Wait control constants 
    48                              <1> 
    49                              <1> ;amount of time to wait while RESET is active.
    50                              <1> 
    51                              <1> WAITCPU_RESET_ON	EQU	21		;Reset on must last at least 14us
    52                              <1> 						;at 250 KBS xfer rate.
    53                              <1> 						;see INTEL MCS, 1985, pg. 5-456
    54                              <1> 
    55                              <1> WAITCPU_FOR_STATUS	EQU	100		;allow 30 microseconds for
    56                              <1> 						;status register to become valid
    57                              <1> 						;before re-reading.
    58                              <1> 
    59                              <1> ;After sending a byte to NEC, status register may remain
    60                              <1> ;incorrectly set for 24 us.
    61                              <1> 
    62                              <1> WAITCPU_RQM_LOW		EQU	24		;number of loops to check for
    63                              <1> 						;RQM low.
    64                              <1> 
    65                              <1> ; COMMON.MAC
    66                              <1> ;
    67                              <1> ;	Timing macros
    68                              <1> ;
    69                              <1> 
    70                              <1> %macro 		SIODELAY 0 			; SHORT IODELAY
    71                              <1> 		jmp short $+2
    72                              <1> %endmacro		
    73                              <1> 
    74                              <1> %macro		IODELAY  0			; NORMAL IODELAY
    75                              <1> 		jmp short $+2
    76                              <1> 		jmp short $+2
    77                              <1> %endmacro
    78                              <1> 
    79                              <1> %macro		NEWIODELAY 0
    80                              <1> 		out	0ebh,al
    81                              <1> %endmacro 
    82                              <1> 
    83                              <1> ; (According to) AWARD BIOS 1999 - ATORGS.ASM (dw -> equ, db -> equ)
    84                              <1> ;;; WAIT_FOR_MEM
    85                              <1> ;WAIT_FDU_INT_LO	equ	017798		; 2.5 secs in 30 micro units.
    86                              <1> ;WAIT_FDU_INT_HI	equ	1
    87                              <1> WAIT_FDU_INT_LH		equ	83334		; 27/02/2015 (2.5 seconds waiting)
    88                              <1> ;;; WAIT_FOR_PORT
    89                              <1> ;WAIT_FDU_SEND_LO	equ	16667		; .5 secons in 30 us units.
    90                              <1> ;WAIT_FDU_SEND_HI	equ	0
    91                              <1> WAIT_FDU_SEND_LH	equ 	16667		; 27/02/2015	
    92                              <1> ;Time to wait while waiting for each byte of NEC results = .5
    93                              <1> ;seconds.  .5 seconds = 500,000 micros.  500,000/30 = 16,667.
    94                              <1> ;WAIT_FDU_RESULTS_LO	equ	16667		; .5 seconds in 30 micro units.
    95                              <1> ;WAIT_FDU_RESULTS_HI	equ	0
    96                              <1> WAIT_FDU_RESULTS_LH	equ	16667  ; 27/02/2015
    97                              <1> ;;; WAIT_REFRESH
    98                              <1> ;amount of time to wait for head settle, per unit in parameter
    99                              <1> ;table = 1 ms.
   100                              <1> WAIT_FDU_HEAD_SETTLE	equ	33		; 1 ms in 30 micro units.
   101                              <1> 
   102                              <1> 
   103                              <1> ; //////////////// DISKETTE I/O ////////////////
   104                              <1> 
   105                              <1> ; 11/12/2014 (copy from IBM PC-XT Model 286 BIOS - POSTEQU.INC)
   106                              <1> 
   107                              <1> ;----------------------------------------
   108                              <1> ;	EQUATES USED BY POST AND BIOS	:
   109                              <1> ;----------------------------------------
   110                              <1> 
   111                              <1> ;--------- 8042 KEYBOARD INTERFACE AND DIAGNOSTIC CONTROL REGISTERS ------------
   112                              <1> ;PORT_A		EQU	060H		; 8042 KEYBOARD SCAN CODE/CONTROL PORT
   113                              <1> ;PORT_B		EQU	061H		; PORT B READ/WRITE DIAGNOSTIC REGISTER
   114                              <1> ;REFRESH_BIT	EQU	00010000B	; REFRESH TEST BIT
   115                              <1> 
   116                              <1> ;----------------------------------------
   117                              <1> ;	CMOS EQUATES FOR THIS SYSTEM	:
   118                              <1> ;-------------------------------------------------------------------------------
   119                              <1> ;CMOS_PORT	EQU	070H		; I/O ADDRESS OF CMOS ADDRESS PORT
   120                              <1> ;CMOS_DATA	EQU	071H		; I/O ADDRESS OF CMOS DATA PORT
   121                              <1> ;NMI		EQU	10000000B	; DISABLE NMI INTERRUPTS MASK -
   122                              <1> 					;  HIGH BIT OF CMOS LOCATION ADDRESS
   123                              <1> 
   124                              <1> ;---------- CMOS TABLE LOCATION ADDRESS'S ## -----------------------------------
   125                              <1> CMOS_DISKETTE	EQU	010H		; DISKETTE DRIVE TYPE BYTE	      ;
   126                              <1> ;		EQU	011H		; - RESERVED			      ;C
   127                              <1> CMOS_DISK	EQU	012H		; FIXED DISK TYPE BYTE		      ;H
   128                              <1> ;		EQU	013H		; - RESERVED			      ;E
   129                              <1> CMOS_EQUIP	EQU	014H		; EQUIPMENT WORD LOW BYTE	      ;C
   130                              <1> 
   131                              <1> ;---------- DISKETTE EQUATES ---------------------------------------------------
   132                              <1> INT_FLAG	EQU	10000000B	; INTERRUPT OCCURRENCE FLAG
   133                              <1> DSK_CHG 	EQU	10000000B	; DISKETTE CHANGE FLAG MASK BIT
   134                              <1> DETERMINED	EQU	00010000B	; SET STATE DETERMINED IN STATE BITS
   135                              <1> HOME		EQU	00010000B	; TRACK 0 MASK
   136                              <1> SENSE_DRV_ST	EQU	00000100B	; SENSE DRIVE STATUS COMMAND
   137                              <1> TRK_SLAP	EQU	030H		; CRASH STOP (48 TPI DRIVES)
   138                              <1> QUIET_SEEK	EQU	00AH		; SEEK TO TRACK 10
   139                              <1> ;MAX_DRV 	EQU	2		; MAX NUMBER OF DRIVES
   140                              <1> HD12_SETTLE	EQU	15		; 1.2 M HEAD SETTLE TIME
   141                              <1> HD320_SETTLE	EQU	20		; 320 K HEAD SETTLE TIME
   142                              <1> MOTOR_WAIT	EQU	37		; 2 SECONDS OF COUNTS FOR MOTOR TURN OFF
   143                              <1> 
   144                              <1> ;---------- DISKETTE ERRORS ----------------------------------------------------
   145                              <1> ;TIME_OUT	EQU	080H		; ATTACHMENT FAILED TO RESPOND
   146                              <1> ;BAD_SEEK	EQU	040H		; SEEK OPERATION FAILED
   147                              <1> BAD_NEC 	EQU	020H		; DISKETTE CONTROLLER HAS FAILED
   148                              <1> BAD_CRC 	EQU	010H		; BAD CRC ON DISKETTE READ
   149                              <1> MED_NOT_FND	EQU	00CH		; MEDIA TYPE NOT FOUND
   150                              <1> DMA_BOUNDARY	EQU	009H		; ATTEMPT TO DMA ACROSS 64K BOUNDARY
   151                              <1> BAD_DMA 	EQU	008H		; DMA OVERRUN ON OPERATION
   152                              <1> MEDIA_CHANGE	EQU	006H		; MEDIA REMOVED ON DUAL ATTACH CARD
   153                              <1> RECORD_NOT_FND	EQU	004H		; REQUESTED SECTOR NOT FOUND
   154                              <1> WRITE_PROTECT	EQU	003H		; WRITE ATTEMPTED ON WRITE PROTECT DISK
   155                              <1> BAD_ADDR_MARK	EQU	002H		; ADDRESS MARK NOT FOUND
   156                              <1> BAD_CMD 	EQU	001H		; BAD COMMAND PASSED TO DISKETTE I/O
   157                              <1> 
   158                              <1> ;---------- DISK CHANGE LINE EQUATES -------------------------------------------
   159                              <1> NOCHGLN 	EQU	001H		; NO DISK CHANGE LINE AVAILABLE
   160                              <1> CHGLN		EQU	002H		; DISK CHANGE LINE AVAILABLE
   161                              <1> 
   162                              <1> ;---------- MEDIA/DRIVE STATE INDICATORS ---------------------------------------
   163                              <1> TRK_CAPA	EQU	00000001B	; 80 TRACK CAPABILITY
   164                              <1> FMT_CAPA	EQU	00000010B	; MULTIPLE FORMAT CAPABILITY (1.2M)
   165                              <1> DRV_DET 	EQU	00000100B	; DRIVE DETERMINED
   166                              <1> MED_DET 	EQU	00010000B	; MEDIA DETERMINED BIT
   167                              <1> DBL_STEP	EQU	00100000B	; DOUBLE STEP BIT
   168                              <1> RATE_MSK	EQU	11000000B	; MASK FOR CLEARING ALL BUT RATE
   169                              <1> RATE_500	EQU	00000000B	; 500 KBS DATA RATE
   170                              <1> RATE_300	EQU	01000000B	; 300 KBS DATA RATE
   171                              <1> RATE_250	EQU	10000000B	; 250 KBS DATA RATE
   172                              <1> STRT_MSK	EQU	00001100B	; OPERATION START RATE MASK
   173                              <1> SEND_MSK	EQU	11000000B	; MASK FOR SEND RATE BITS
   174                              <1> 
   175                              <1> ;---------- MEDIA/DRIVE STATE INDICATORS COMPATIBILITY -------------------------
   176                              <1> M3D3U		EQU	00000000B	; 360 MEDIA/DRIVE NOT ESTABLISHED
   177                              <1> M3D1U		EQU	00000001B	; 360 MEDIA,1.2DRIVE NOT ESTABLISHED
   178                              <1> M1D1U		EQU	00000010B	; 1.2 MEDIA/DRIVE NOT ESTABLISHED
   179                              <1> MED_UNK 	EQU	00000111B	; NONE OF THE ABOVE
   180                              <1> 
   181                              <1> ;---------- INTERRUPT EQUATES --------------------------------------------------
   182                              <1> ;EOI		EQU	020H		; END OF INTERRUPT COMMAND TO 8259
   183                              <1> ;INTA00		EQU	020H		; 8259 PORT
   184                              <1> INTA01		EQU	021H		; 8259 PORT
   185                              <1> INTB00		EQU	0A0H		; 2ND 8259
   186                              <1> INTB01		EQU	0A1H		;
   187                              <1> 
   188                              <1> ;-------------------------------------------------------------------------------
   189                              <1> DMA08		EQU	008H		; DMA STATUS REGISTER PORT ADDRESS
   190                              <1> DMA		EQU	000H		; DMA CH.0 ADDRESS REGISTER PORT ADDRESS
   191                              <1> DMA18		EQU	0D0H		; 2ND DMA STATUS PORT ADDRESS
   192                              <1> DMA1		EQU	0C0H		; 2ND DMA CH.0 ADDRESS REGISTER ADDRESS
   193                              <1> ;-------------------------------------------------------------------------------
   194                              <1> ;TIMER		EQU	040H		; 8254 TIMER - BASE ADDRESS
   195                              <1> 
   196                              <1> ;-------------------------------------------------------------------------------
   197                              <1> DMA_PAGE	EQU	081H		; START OF DMA PAGE REGISTERS
   198                              <1> 
   199                              <1> ; 06/02/2015 (unix386.s, protected mode modifications)
   200                              <1> ; (unix386.s <-- dsectrm2.s)
   201                              <1> ; 11/12/2014 (copy from IBM PC-XT Model 286 BIOS - DSEG.INC)
   202                              <1> 
   203                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
   204                              <1> ; 10/12/2014
   205                              <1> ;
   206                              <1> ;int40h:
   207                              <1> ;	pushf
   208                              <1> ;	push 	cs
   209                              <1> ;	;cli
   210                              <1> ;	call 	DISKETTE_IO_1
   211                              <1> ;	retn
   212                              <1> 
   213                              <1> ; DSKETTE ----- 04/21/86 DISKETTE BIOS
   214                              <1> ; (IBM PC XT Model 286 System BIOS Source Code, 04-21-86)
   215                              <1> ;
   216                              <1> 
   217                              <1> ;-- INT13H ---------------------------------------------------------------------
   218                              <1> ; DISKETTE I/O
   219                              <1> ;	THIS INTERFACE PROVIDES ACCESS TO THE 5 1/4 INCH 360 KB,
   220                              <1> ;	1.2 MB, 720 KB AND 1.44 MB DISKETTE DRIVES.
   221                              <1> ; INPUT
   222                              <1> ;	(AH) =  00H RESET DISKETTE SYSTEM
   223                              <1> ;		HARD RESET TO NEC, PREPARE COMMAND, RECALIBRATE REQUIRED
   224                              <1> ;		ON ALL DRIVES
   225                              <1> ;------------------------------------------------------------------------------- 
   226                              <1> ;	(AH)= 01H  READ THE STATUS OF THE SYSTEM INTO (AH)
   227                              <1> ;		@DISKETTE_STATUS FROM LAST OPERATION IS USED
   228                              <1> ;-------------------------------------------------------------------------------
   229                              <1> ;	REGISTERS FOR READ/WRITE/VERIFY/FORMAT
   230                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   231                              <1> ;	(DH) - HEAD NUMBER (0-1 ALLOWED, NOT VALUE CHECKED)
   232                              <1> ;	(CH) - TRACK NUMBER (NOT VALUE CHECKED)
   233                              <1> ;		MEDIA	DRIVE	TRACK NUMBER
   234                              <1> ;		320/360	320/360	    0-39
   235                              <1> ;		320/360	1.2M	    0-39
   236                              <1> ;		1.2M	1.2M	    0-79
   237                              <1> ;		720K	720K	    0-79
   238                              <1> ;		1.44M	1.44M	    0-79	
   239                              <1> ;	(CL) - 	SECTOR NUMBER (NOT VALUE CHECKED, NOT USED FOR FORMAT)
   240                              <1> ;		MEDIA	DRIVE	SECTOR NUMBER
   241                              <1> ;		320/360	320/360	     1-8/9
   242                              <1> ;		320/360	1.2M	     1-8/9
   243                              <1> ;		1.2M	1.2M	     1-15
   244                              <1> ;		720K	720K	     1-9
   245                              <1> ;		1.44M	1.44M	     1-18		
   246                              <1> ;	(AL)	NUMBER OF SECTORS (NOT VALUE CHECKED)
   247                              <1> ;		MEDIA	DRIVE	MAX NUMBER OF SECTORS
   248                              <1> ;		320/360	320/360	        8/9
   249                              <1> ;		320/360	1.2M	        8/9
   250                              <1> ;		1.2M	1.2M		15
   251                              <1> ;		720K	720K		9
   252                              <1> ;		1.44M	1.44M		18
   253                              <1> ;
   254                              <1> ;	(ES:BX) - ADDRESS OF BUFFER (NOT REQUIRED FOR VERIFY)
   255                              <1> ;
   256                              <1> ;-------------------------------------------------------------------------------
   257                              <1> ;	(AH)= 02H  READ THE DESIRED SECTORS INTO MEMORY
   258                              <1> ;-------------------------------------------------------------------------------
   259                              <1> ;	(AH)= 03H  WRITE THE DESIRED SECTORS FROM MEMORY
   260                              <1> ;-------------------------------------------------------------------------------
   261                              <1> ;	(AH)= 04H  VERIFY THE DESIRED SECTORS
   262                              <1> ;-------------------------------------------------------------------------------
   263                              <1> ;	(AH)= 05H  FORMAT THE DESIRED TRACK
   264                              <1> ;		(ES,BX) MUST POINT TO THE COLLECTION OF DESIRED ADDRESS FIELDS
   265                              <1> ;		FOR THE	TRACK. EACH FIELD IS COMPOSED OF 4 BYTES, (C,H,R,N),
   266                              <1> ;		WHERE C = TRACK NUMBER, H=HEAD NUMBER, R = SECTOR NUMBER, 
   267                              <1> ;		N= NUMBER OF BYTES PER SECTOR (00=128,01=256,02=512,03=1024),
   268                              <1> ;		THERE MUST BE ONE ENTRY FOR EVERY SECTOR ON THE TRACK.
   269                              <1> ;		THIS INFORMATION IS USED TO FIND THE REQUESTED SECTOR DURING 
   270                              <1> ;		READ/WRITE ACCESS.
   271                              <1> ;		PRIOR TO FORMATTING A DISKETTE, IF THERE EXISTS MORE THAN
   272                              <1> ;		ONE SUPPORTED MEDIA FORMAT TYPE WITHIN THE DRIVE IN QUESTION,
   273                              <1> ;		THEN "SET DASD TYPE" (INT 13H, AH = 17H) OR 'SET MEDIA TYPE'
   274                              <1> ;		(INT 13H, AH =  18H) MUST BE CALLED TO SET THE DISKETTE TYPE
   275                              <1> ;		THAT IS TO BE FORMATTED. IF "SET DASD TYPE" OR "SET MEDIA TYPE"
   276                              <1> ;		IS NOT CALLED, THE FORMAT ROUTINE WILL ASSUME THE 
   277                              <1> ;		MEDIA FORMAT TO BE THE MAXIMUM CAPACITY OF THE DRIVE.
   278                              <1> ;
   279                              <1> ;		THESE PARAMETERS OF DISK BASE MUST BE CHANGED IN ORDER TO
   280                              <1> ;		FORMAT THE FOLLOWING MEDIAS:
   281                              <1> ;		---------------------------------------------
   282                              <1> ;		: MEDIA  :     DRIVE      : PARM 1 : PARM 2 :
   283                              <1> ;		---------------------------------------------
   284                              <1> ;		: 320K	 : 320K/360K/1.2M :  50H   :   8    :
   285                              <1> ;		: 360K	 : 320K/360K/1.2M :  50H   :   9    :
   286                              <1> ;		: 1.2M	 : 1.2M           :  54H   :  15    :
   287                              <1> ;		: 720K	 : 720K/1.44M     :  50H   :   9    :
   288                              <1> ;		: 1.44M	 : 1.44M          :  6CH   :  18    :		  	
   289                              <1> ;		---------------------------------------------
   290                              <1> ;		NOTES: - PARM 1 = GAP LENGTH FOR FORMAT
   291                              <1> ;		       - PARM 2 = EOT (LAST SECTOR ON TRACK)
   292                              <1> ;		       - DISK BASE IS POINTED BY DISK POINTER LOCATED
   293                              <1> ;			 AT ABSOLUTE ADDRESS 0:78.
   294                              <1> ;		       - WHEN FORMAT OPERATIONS ARE COMPLETE, THE PARAMETERS
   295                              <1> ;			 SHOULD BE RESTORED TO THEIR RESPECTIVE INITIAL VALUES.			
   296                              <1> ;-------------------------------------------------------------------------------
   297                              <1> ;	(AH) = 08H READ DRIVE PARAMETERS
   298                              <1> ;	REGISTERS
   299                              <1> ;	  INPUT
   300                              <1> ;	    (DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   301                              <1> ;	     ** 27/05/2016 - TRDOS 386 (TRDOS v2.0) **	
   302                              <1> ;            ** EBX = Buffer address for floppy disk parameters table **
   303                              <1> ;	  OUTPUT
   304                              <1> ;	    (ES:DI) POINTS TO DRIVE PARAMETER TABLE
   305                              <1> ; 	    *** TRDOS 386 note: floppy disk parameter table (16 bytes)
   306                              <1> ;	    will be returned to user in EBX, buffer address *** 27/05/2016 ***		
   307                              <1> ;					
   308                              <1> ;	    (CH) - LOW ORDER 8 OF 10 BITS MAXIMUM NUMBER OF TRACKS
   309                              <1> ;	    (CL) - BITS 7 & 6 - HIGH ORDER TWO BITS OF MAXIMUM TRACKS
   310                              <1> ;	           BITS 5 THRU 0 - MAXIMUM SECTORS PER TRACK
   311                              <1> ;	    (DH) - MAXIMUM HEAD NUMBER
   312                              <1> ;	    (DL) - NUMBER OF DISKETTE DRIVES INSTALLED
   313                              <1> ;	    (BH) - 0
   314                              <1> ;	    (BL) - BITS 7 THRU 4 - 0
   315                              <1> ;	           BITS 3 THRU 0 - VALID DRIVE TYPE VALUE IN CMOS
   316                              <1> ;	    (AX) - 0
   317                              <1> ;	 UNDER THE FOLLOWING CIRCUMSTANCES:
   318                              <1> ;	    (1) THE DRIVE NUMBER IS INVALID,
   319                              <1> ;	    (2) THE DRIVE TYPE IS UNKNOWN AND CMOS IS NOT PRESENT, 
   320                              <1> ;	    (3) THE DRIVE TYPE IS UNKNOWN AND CMOS IS BAD,
   321                              <1> ;	    (4) OR THE DRIVE TYPE IS UNKNOWN AND THE CMOS DRIVE TYPE IS INVALID
   322                              <1> ;	    THEN ES,AX,BX,CX,DH,DI=0 ; DL=NUMBER OF DRIVES. 
   323                              <1> ;	    IF NO DRIVES ARE PRESENT THEN: ES,AX,BX,CX,DX,DI=0.
   324                              <1> ;	    @DISKETTE_STATUS = 0 AND CY IS RESET.
   325                              <1> ;-------------------------------------------------------------------------------
   326                              <1> ;	(AH)= 15H  READ DASD TYPE
   327                              <1> ;	OUTPUT REGISTERS
   328                              <1> ;	(AH) - ON RETURN IF CARRY FLAG NOT SET, OTHERWISE ERROR	
   329                              <1> ;		00 - DRIVE NOT PRESENT	
   330                              <1> ;		01 - DISKETTE, NO CHANGE LINE AVAILABLE
   331                              <1> ;		02 - DISKETTE, CHANGE LINE AVAILABLE	
   332                              <1> ;		03 - RESERVED (FIXED DISK)
   333                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   334                              <1> ;-------------------------------------------------------------------------------
   335                              <1> ;	(AH)= 16H  DISK CHANGE LINE STATUS
   336                              <1> ;	OUTPUT REGISTERS
   337                              <1> ;	(AH) - 00 - DISK CHANGE LINE NOT ACTIVE	
   338                              <1> ;	       06 - DISK CHANGE LINE ACTIVE & CARRY BIT ON
   339                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   340                              <1> ;-------------------------------------------------------------------------------
   341                              <1> ;	(AH)= 17H  SET DASD TYPE FOR FORMAT
   342                              <1> ;	INPUT REGISTERS
   343                              <1> ;	(AL) -	00 - NOT USED	
   344                              <1> ;		01 - DISKETTE 320/360K IN 360K DRIVE	
   345                              <1> ;		02 - DISKETTE 360K IN 1.2M DRIVE
   346                              <1> ;		03 - DISKETTE 1.2M IN 1.2M DRIVE
   347                              <1> ;		04 - DISKETTE 720K IN 720K DRIVE
   348                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED:
   349                              <1> ;	       (DO NOT USE WHEN DISKETTE ATTACH CARD USED)
   350                              <1> ;-------------------------------------------------------------------------------
   351                              <1> ;	(AH)= 18H  SET MEDIA TYPE FOR FORMAT
   352                              <1> ;	INPUT REGISTERS
   353                              <1> ;	(CH) - LOW ORDER 8 OF 10 BITS MAXIMUM TRACKS
   354                              <1> ;	(CL) - BITS 7 & 6 - HIGH ORDER TWO BITS OF MAXIMUM TRACKS
   355                              <1> ;	       BITS 5 THRU 0 - MAXIMUM SECTORS PER TRACK
   356                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHACKED)
   357                              <1> ;	OUTPUT REGISTERS:
   358                              <1> ;	(ES:DI) - POINTER TO DRIVE PARAMETERS TABLE FOR THIS MEDIA TYPE,
   359                              <1> ;		  UNCHANGED IF (AH) IS NON-ZERO
   360                              <1> ;	(AH) - 00H, CY = 0, TRACK AND SECTORS/TRACK COMBINATION IS SUPPORTED
   361                              <1> ;	     - 01H, CY = 1, FUNCTION IS NOT AVAILABLE
   362                              <1> ;	     - 0CH, CY = 1, TRACK AND SECTORS/TRACK COMBINATION IS NOT SUPPORTED
   363                              <1> ;	     - 80H, CY = 1, TIME OUT (DISKETTE NOT PRESENT)		
   364                              <1> ;-------------------------------------------------------------------------------
   365                              <1> ;	DISK CHANGE STATUS IS ONLY CHECKED WHEN A MEDIA SPECIFIED IS OTHER
   366                              <1> ;	THAN 360 KB DRIVE. IF THE DISK CHANGE LINE IS FOUND TO BE
   367                              <1> ;	ACTIVE THE FOLLOWING ACTIONS TAKE PLACE:
   368                              <1> ;		ATTEMPT TO RESET DISK CHANGE LINE TO INACTIVE STATE. 
   369                              <1> ;		IF ATTEMPT SUCCEEDS SET DASD TYPE FOR FORMAT AND RETURN DISK 
   370                              <1> ;		CHANGE ERROR CODE
   371                              <1> ;		IF ATTEMPT FAILS RETURN TIMEOUT ERROR CODE AND SET DASD TYPE 
   372                              <1> ;		TO A PREDETERMINED STATE INDICATING MEDIA TYPE UNKNOWN.
   373                              <1> ;	IF THE DISK CHANGE LINE IN INACTIVE PERFORM SET DASD TYPE FOR FORMAT.
   374                              <1> ;
   375                              <1> ; DATA VARIABLE -- @DISK_POINTER
   376                              <1> ;	DOUBLE WORD POINTER TO THE CURRENT SET OF DISKETTE PARAMETERS
   377                              <1> ;-------------------------------------------------------------------------------
   378                              <1> ; OUTPUT FOR ALL FUNCTIONS
   379                              <1> ;	AH = STATUS OF OPERATION
   380                              <1> ;		STATUS BITS ARE DEFINED IN THE EQUATES FOR @DISKETTE_STATUS
   381                              <1> ;		VARIABLE IN THE DATA SEGMENT OF THIS MODULE
   382                              <1> ;	CY = 0	SUCCESSFUL OPERATION (AH=0 ON RETURN, EXCEPT FOR READ DASD
   383                              <1> ;		TYPE AH=(15)).
   384                              <1> ;	CY = 1	FAILED OPERATION (AH HAS ERROR REASON)
   385                              <1> ;	FOR READ/WRITE/VERIFY
   386                              <1> ;		DS,BX,DX,CX PRESERVED
   387                              <1> ;	NOTE: IF AN ERROR IS REPORTED BY THE DISKETTE CODE, THE APPROPRIATE 
   388                              <1> ;		ACTION IS TO RESET THE DISKETTE, THEN RETRY THE OPERATION.
   389                              <1> ;		ON READ ACCESSES, NO MOTOR START DELAY IS TAKEN, SO THAT 
   390                              <1> ;		THREE RETRIES ARE REQUIRED ON READS TO ENSURE THAT THE 
   391                              <1> ;		PROBLEM IS NOT DUE TO MOTOR START-UP.
   392                              <1> ;-------------------------------------------------------------------------------
   393                              <1> ;
   394                              <1> ; DISKETTE STATE MACHINE - ABSOLUTE ADDRESS 40:90 (DRIVE A) & 91 (DRIVE B)
   395                              <1> ;
   396                              <1> ;   -----------------------------------------------------------------
   397                              <1> ;   |       |       |       |       |       |       |       |       |
   398                              <1> ;   |   7   |   6   |   5   |   4   |   3   |   2   |   1   |   0   |
   399                              <1> ;   |       |       |       |       |       |       |       |       |
   400                              <1> ;   -----------------------------------------------------------------
   401                              <1> ;	|	|	|	|	|	|	|	|
   402                              <1> ;	|	|	|	|	|	-----------------
   403                              <1> ;	|	|	|	|	|		|
   404                              <1> ;	|	|	|	|    RESERVED		|
   405                              <1> ;	|	|	|	|		  PRESENT STATE
   406                              <1> ;	|	|	|	|	000: 360K IN 360K DRIVE UNESTABLISHED
   407                              <1> ;	|	|	|	|	001: 360K IN 1.2M DRIVE UNESTABLISHED
   408                              <1> ;	|	|	|	|	010: 1.2M IN 1.2M DRIVE UNESTABLISHED
   409                              <1> ;	|	|	|	|	011: 360K IN 360K DRIVE ESTABLISHED
   410                              <1> ;	|	|	|	|	100: 360K IN 1.2M DRIVE ESTABLISHED
   411                              <1> ;	|	|	|	|	101: 1.2M IN 1.2M DRIVE ESTABLISHED
   412                              <1> ;	|	|	|	|	110: RESERVED
   413                              <1> ;	|	|	|	|	111: NONE OF THE ABOVE
   414                              <1> ;	|	|	|	|
   415                              <1> ;	|	|	|	------>	MEDIA/DRIVE ESTABLISHED
   416                              <1> ;	|	|	|
   417                              <1> ;	|	|	-------------->	DOUBLE STEPPING REQUIRED (360K IN 1.2M
   418                              <1> ;	|	|			DRIVE)
   419                              <1> ;	|	|
   420                              <1> ;	------------------------------>	DATA TRANSFER RATE FOR THIS DRIVE:
   421                              <1> ;
   422                              <1> ;						00: 500 KBS
   423                              <1> ;						01: 300 KBS
   424                              <1> ;						10: 250 KBS
   425                              <1> ;						11: RESERVED
   426                              <1> ;
   427                              <1> ;
   428                              <1> ;-------------------------------------------------------------------------------
   429                              <1> ; STATE OPERATION STARTED - ABSOLUTE ADDRESS 40:92 (DRIVE A) & 93 (DRIVE B)
   430                              <1> ;-------------------------------------------------------------------------------
   431                              <1> ; PRESENT CYLINDER NUMBER - ABSOLUTE ADDRESS 40:94 (DRIVE A) & 95 (DRIVE B)
   432                              <1> ;-------------------------------------------------------------------------------
   433                              <1> 
   434                              <1> struc MD
   435 00000000 <res 00000001>      <1> 	.SPEC1		resb	1	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   436 00000001 <res 00000001>      <1> 	.SPEC2		resb	1	; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   437 00000002 <res 00000001>      <1> 	.OFF_TIM	resb	1	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   438 00000003 <res 00000001>      <1> 	.BYT_SEC	resb	1	; 512 BYTES/SECTOR
   439 00000004 <res 00000001>      <1> 	.SEC_TRK	resb	1	; EOT (LAST SECTOR ON TRACK)
   440 00000005 <res 00000001>      <1> 	.GAP		resb	1	; GAP LENGTH
   441 00000006 <res 00000001>      <1> 	.DTL		resb	1	; DTL
   442 00000007 <res 00000001>      <1> 	.GAP3		resb	1	; GAP LENGTH FOR FORMAT
   443 00000008 <res 00000001>      <1> 	.FIL_BYT	resb	1	; FILL BYTE FOR FORMAT
   444 00000009 <res 00000001>      <1> 	.HD_TIM		resb	1	; HEAD SETTLE TIME (MILLISECONDS)
   445 0000000A <res 00000001>      <1> 	.STR_TIM	resb	1	; MOTOR START TIME (1/8 SECONDS)
   446 0000000B <res 00000001>      <1> 	.MAX_TRK	resb	1	; MAX. TRACK NUMBER
   447 0000000C <res 00000001>      <1> 	.RATE		resb	1	; DATA TRANSFER RATE
   448                              <1> endstruc
   449                              <1> 
   450                              <1> BIT7OFF	EQU	7FH
   451                              <1> BIT7ON	EQU	80H
   452                              <1> 
   453                              <1> ;;int13h: ; 16/02/2015
   454                              <1> ;; 16/02/2015 - 21/02/2015
   455                              <1> int40h:
   456 00003373 9C                  <1> 	pushfd
   457 00003374 0E                  <1> 	push 	cs
   458 00003375 E801000000          <1> 	call 	DISKETTE_IO_1
   459 0000337A C3                  <1> 	retn	
   460                              <1> 
   461                              <1> DISKETTE_IO_1:
   462                              <1> 
   463 0000337B FB                  <1> 	STI				; INTERRUPTS BACK ON
   464 0000337C 55                  <1> 	PUSH	eBP			; USER REGISTER
   465 0000337D 57                  <1> 	PUSH	eDI			; USER REGISTER
   466 0000337E 52                  <1> 	PUSH	eDX			; HEAD #, DRIVE # OR USER REGISTER
   467 0000337F 53                  <1> 	PUSH	eBX			; BUFFER OFFSET PARAMETER OR REGISTER
   468 00003380 51                  <1> 	PUSH	eCX			; TRACK #-SECTOR # OR USER REGISTER
   469 00003381 89E5                <1> 	MOV	eBP,eSP			; BP     => PARAMETER LIST DEP. ON AH
   470                              <1> 					; [BP]   = SECTOR #
   471                              <1> 					; [BP+1] = TRACK #
   472                              <1> 					; [BP+2] = BUFFER OFFSET
   473                              <1> 					; FOR RETURN OF DRIVE PARAMETERS:
   474                              <1> 					; CL/[BP] = BITS 7&6 HI BITS OF MAX CYL
   475                              <1> 					; 	    BITS 0-5 MAX SECTORS/TRACK
   476                              <1> 					; CH/[BP+1] = LOW 8 BITS OF MAX CYL.
   477                              <1> 					; BL/[BP+2] = BITS 7-4 = 0
   478                              <1> 					;	      BITS 3-0 = VALID CMOS TYPE
   479                              <1> 					; BH/[BP+3] = 0
   480                              <1> 					; DL/[BP+4] = # DRIVES INSTALLED
   481                              <1> 					; DH/[BP+5] = MAX HEAD #
   482                              <1> 					; DI/[BP+6] = OFFSET TO DISK BASE
   483 00003383 06                  <1> 	push	es ; 06/02/2015	
   484 00003384 1E                  <1> 	PUSH	DS			; BUFFER SEGMENT PARM OR USER REGISTER
   485 00003385 56                  <1> 	PUSH	eSI			; USER REGISTERS
   486                              <1> 	;CALL	DDS			; SEGMENT OF BIOS DATA AREA TO DS
   487                              <1> 	;mov	cx, cs
   488                              <1> 	;mov	ds, cx
   489 00003386 66B91000            <1> 	mov	cx, KDATA
   490 0000338A 8ED9                <1>         mov     ds, cx
   491 0000338C 8EC1                <1>         mov     es, cx
   492                              <1> 
   493                              <1> 	;CMP	AH,(FNC_TAE-FNC_TAB)/2	; CHECK FOR > LARGEST FUNCTION
   494 0000338E 80FC19              <1> 	cmp	ah,(FNC_TAE-FNC_TAB)/4  ; 18/02/2015
   495 00003391 7202                <1> 	JB	short OK_FUNC		; FUNCTION OK
   496 00003393 B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   497                              <1> OK_FUNC:
   498 00003395 80FC01              <1> 	CMP	AH,1			; RESET OR STATUS ?
   499 00003398 760C                <1> 	JBE	short OK_DRV		; IF RESET OR STATUS DRIVE ALWAYS OK
   500 0000339A 80FC08              <1> 	CMP	AH,8			; READ DRIVE PARMS ?
   501 0000339D 7407                <1> 	JZ	short OK_DRV		; IF SO DRIVE CHECKED LATER
   502 0000339F 80FA01              <1> 	CMP	DL,1			; DRIVES 0 AND 1 OK
   503 000033A2 7602                <1> 	JBE	short OK_DRV		; IF 0 OR 1 THEN JUMP
   504 000033A4 B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   505                              <1> OK_DRV:
   506 000033A6 31C9                <1> 	xor	ecx, ecx
   507                              <1> 	;mov	esi, ecx ; 08/02/2015
   508 000033A8 89CF                <1> 	mov	edi, ecx ; 08/02/2015
   509 000033AA 88E1                <1> 	MOV	CL,AH			; CL = FUNCTION
   510                              <1> 	;XOR	CH,CH			; CX = FUNCTION
   511                              <1> 	;SHL	CL, 1			; FUNCTION TIMES 2
   512 000033AC C0E102              <1> 	SHL	CL, 2 ; 20/02/2015	; FUNCTION TIMES 4 (for 32 bit offset)
   513 000033AF BB[E7330000]        <1> 	MOV	eBX,FNC_TAB		; LOAD START OF FUNCTION TABLE
   514 000033B4 01CB                <1> 	ADD	eBX,eCX			; ADD OFFSET INTO TABLE => ROUTINE
   515 000033B6 88F4                <1> 	MOV	AH,DH			; AX = HEAD #,# OF SECTORS OR DASD TYPE
   516 000033B8 30F6                <1> 	XOR	DH,DH			; DX = DRIVE #
   517 000033BA 6689C6              <1> 	MOV	SI,AX			; SI = HEAD #,# OF SECTORS OR DASD TYPE
   518 000033BD 6689D7              <1> 	MOV     DI,DX                   ; DI = DRIVE #
   519                              <1> 	;
   520                              <1> 	; 11/12/2014
   521 000033C0 8815[455C0000]      <1>         mov     [cfd], dl               ; current floppy drive (for 'GET_PARM')        
   522                              <1> 	;
   523 000033C6 8A25[68420100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; LOAD STATUS TO AH FOR STATUS FUNCTION
   524 000033CC C605[68420100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; INITIALIZE FOR ALL OTHERS
   525                              <1> 
   526                              <1> ;	THROUGHOUT THE DISKETTE BIOS, THE FOLLOWING INFORMATION IS CONTAINED IN
   527                              <1> ;	THE FOLLOWING MEMORY LOCATIONS AND REGISTERS. NOT ALL DISKETTE BIOS
   528                              <1> ;	FUNCTIONS REQUIRE ALL OF THESE PARAMETERS.
   529                              <1> ;
   530                              <1> ;		DI	: DRIVE #
   531                              <1> ;		SI-HI	: HEAD #
   532                              <1> ;		SI-LOW	: # OF SECTORS OR DASD TYPE FOR FORMAT
   533                              <1> ;		ES	: BUFFER SEGMENT
   534                              <1> ;		[BP]	: SECTOR #
   535                              <1> ;		[BP+1]	: TRACK #
   536                              <1> ;		[BP+2]	: BUFFER OFFSET
   537                              <1> ;
   538                              <1> ;	ACROSS CALLS TO SUBROUTINES THE CARRY FLAG (CY=1), WHERE INDICATED IN 
   539                              <1> ;	SUBROUTINE PROLOGUES, REPRESENTS AN EXCEPTION RETURN (NORMALLY AN ERROR 
   540                              <1> ;	CONDITION). IN MOST CASES, WHEN CY = 1, @DSKETTE_STATUS CONTAINS THE 
   541                              <1> ;	SPECIFIC ERROR CODE.
   542                              <1> ;
   543                              <1> 					; (AH) = @DSKETTE_STATUS
   544 000033D3 FF13                <1> 	CALL	dWORD [eBX]		; CALL THE REQUESTED FUNCTION
   545 000033D5 5E                  <1> 	POP	eSI			; RESTORE ALL REGISTERS
   546 000033D6 1F                  <1> 	POP	DS
   547 000033D7 07                  <1> 	pop	es	; 06/02/2015
   548 000033D8 59                  <1> 	POP	eCX
   549 000033D9 5B                  <1> 	POP	eBX
   550 000033DA 5A                  <1> 	POP	eDX
   551 000033DB 5F                  <1> 	POP	eDI
   552 000033DC 89E5                <1> 	MOV	eBP, eSP
   553 000033DE 50                  <1> 	PUSH	eAX
   554 000033DF 9C                  <1> 	PUSHFd
   555 000033E0 58                  <1> 	POP	eAX
   556                              <1> 	;MOV	[BP+6], AX
   557 000033E1 89450C              <1> 	mov	[ebp+12], eax  ; 18/02/2015, flags
   558 000033E4 58                  <1> 	POP	eAX
   559 000033E5 5D                  <1> 	POP	eBP
   560 000033E6 CF                  <1> 	IRETd
   561                              <1> 
   562                              <1> ;-------------------------------------------------------------------------------
   563                              <1> ; DW --> dd (06/02/2015)
   564 000033E7 [4B340000]          <1> FNC_TAB	dd	DSK_RESET		; AH = 00H; RESET
   565 000033EB [C4340000]          <1> 	dd	DSK_STATUS		; AH = 01H; STATUS
   566 000033EF [D5340000]          <1> 	dd	DSK_READ		; AH = 02H; READ
   567 000033F3 [E6340000]          <1> 	dd	DSK_WRITE		; AH = 03H; WRITE
   568 000033F7 [F7340000]          <1> 	dd	DSK_VERF		; AH = 04H; VERIFY
   569 000033FB [08350000]          <1> 	dd	DSK_FORMAT		; AH = 05H; FORMAT
   570 000033FF [8D350000]          <1> 	dd	FNC_ERR			; AH = 06H; INVALID
   571 00003403 [8D350000]          <1> 	dd	FNC_ERR			; AH = 07H; INVALID
   572 00003407 [9A350000]          <1> 	dd	DSK_PARMS		; AH = 08H; READ DRIVE PARAMETERS
   573 0000340B [8D350000]          <1> 	dd	FNC_ERR			; AH = 09H; INVALID
   574 0000340F [8D350000]          <1> 	dd	FNC_ERR			; AH = 0AH; INVALID
   575 00003413 [8D350000]          <1> 	dd	FNC_ERR			; AH = 0BH; INVALID
   576 00003417 [8D350000]          <1> 	dd	FNC_ERR			; AH = 0CH; INVALID
   577 0000341B [8D350000]          <1> 	dd	FNC_ERR			; AH = 0DH; INVALID
   578 0000341F [8D350000]          <1> 	dd	FNC_ERR			; AH = 0EH; INVALID
   579 00003423 [8D350000]          <1> 	dd	FNC_ERR			; AH = 0FH; INVALID
   580 00003427 [8D350000]          <1> 	dd	FNC_ERR			; AH = 10H; INVALID
   581 0000342B [8D350000]          <1> 	dd	FNC_ERR			; AH = 11H; INVALID
   582 0000342F [8D350000]          <1> 	dd	FNC_ERR			; AH = 12H; INVALID
   583 00003433 [8D350000]          <1> 	dd	FNC_ERR			; AH = 13H; INVALID
   584 00003437 [8D350000]          <1> 	dd	FNC_ERR			; AH = 14H; INVALID
   585 0000343B [72360000]          <1> 	dd	DSK_TYPE		; AH = 15H; READ DASD TYPE
   586 0000343F [9D360000]          <1> 	dd	DSK_CHANGE		; AH = 16H; CHANGE STATUS
   587 00003443 [D7360000]          <1> 	dd	FORMAT_SET		; AH = 17H; SET DASD TYPE
   588 00003447 [5A370000]          <1> 	dd	SET_MEDIA		; AH = 18H; SET MEDIA TYPE	
   589                              <1> FNC_TAE EQU     $                       ; END
   590                              <1> 
   591                              <1> ;-------------------------------------------------------------------------------
   592                              <1> ; DISK_RESET	(AH = 00H)	
   593                              <1> ;		RESET THE DISKETTE SYSTEM.
   594                              <1> ;
   595                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   596                              <1> ;-------------------------------------------------------------------------------
   597                              <1> DSK_RESET:
   598 0000344B 66BAF203            <1> 	MOV	DX,03F2H		; ADAPTER CONTROL PORT
   599 0000344F FA                  <1> 	CLI				; NO INTERRUPTS
   600 00003450 A0[66420100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
   601 00003455 243F                <1> 	AND	AL,00111111B		; KEEP SELECTED AND MOTOR ON BITS
   602 00003457 C0C004              <1> 	ROL	AL,4			; MOTOR VALUE TO HIGH NIBBLE
   603                              <1> 					; DRIVE SELECT TO LOW NIBBLE
   604 0000345A 0C08                <1> 	OR	AL,00001000B		; TURN ON INTERRUPT ENABLE
   605 0000345C EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   606 0000345D C605[65420100]00    <1> 	MOV	byte [SEEK_STATUS],0	; SET RECALIBRATE REQUIRED ON ALL DRIVES
   607                              <1> 	;JMP	$+2			; WAIT FOR I/O
   608                              <1> 	;JMP	$+2			; WAIT FOR I/O (TO INSURE MINIMUM
   609                              <1> 					;      PULSE WIDTH)
   610                              <1> 	; 19/12/2014
   611                              <1> 	NEWIODELAY
   611 00003464 E6EB                <2>  out 0ebh,al
   612                              <1> 
   613                              <1> 	; 17/12/2014 
   614                              <1> 	; AWARD BIOS 1999 - RESETDRIVES (ADISK.ASM)
   615 00003466 B915000000          <1> 	mov	ecx, WAITCPU_RESET_ON	; cx = 21 -- Min. 14 micro seconds !?
   616                              <1> wdw1:
   617                              <1> 	NEWIODELAY   ; 27/02/2015
   617 0000346B E6EB                <2>  out 0ebh,al
   618 0000346D E2FC                <1> 	loop	wdw1
   619                              <1> 	;
   620 0000346F 0C04                <1> 	OR	AL,00000100B		; TURN OFF RESET BIT
   621 00003471 EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   622                              <1> 	; 16/12/2014
   623                              <1> 	IODELAY
   623 00003472 EB00                <2>  jmp short $+2
   623 00003474 EB00                <2>  jmp short $+2
   624                              <1> 	;
   625                              <1> 	;STI				; ENABLE THE INTERRUPTS
   626 00003476 E83C0C0000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
   627 0000347B 723E                <1> 	JC	short DR_ERR		; IF ERROR, RETURN IT
   628 0000347D 66B9C000            <1> 	MOV	CX,11000000B		; CL = EXPECTED @NEC_STATUS
   629                              <1> NXT_DRV:
   630 00003481 6651                <1> 	PUSH	CX			; SAVE FOR CALL
   631 00003483 B8[B9340000]        <1> 	MOV	eAX, DR_POP_ERR 	; LOAD NEC_OUTPUT ERROR ADDRESS
   632 00003488 50                  <1> 	PUSH	eAX			; "
   633 00003489 B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
   634 0000348B E81A0B0000          <1> 	CALL	NEC_OUTPUT
   635 00003490 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
   636 00003491 E8510C0000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
   637 00003496 6659                <1> 	POP	CX			; RESTORE AFTER CALL
   638 00003498 7221                <1> 	JC	short DR_ERR		; ERROR RETURN
   639 0000349A 3A0D[69420100]      <1> 	CMP	CL, [NEC_STATUS]	; TEST FOR DRIVE READY TRANSITION
   640 000034A0 7519                <1> 	JNZ	short DR_ERR		; EVERYTHING OK
   641 000034A2 FEC1                <1> 	INC	CL			; NEXT EXPECTED @NEC_STATUS
   642 000034A4 80F9C3              <1> 	CMP	CL,11000011B		; ALL POSSIBLE DRIVES CLEARED
   643 000034A7 76D8                <1> 	JBE	short NXT_DRV		; FALL THRU IF 11000100B OR >
   644                              <1> 	;
   645 000034A9 E869030000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   646                              <1> RESBAC:
   647 000034AE E81D090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   648 000034B3 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   649 000034B6 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   650 000034B8 C3                  <1> 	RETn		
   651                              <1> DR_POP_ERR:
   652 000034B9 6659                <1> 	POP	CX			; CLEAR STACK
   653                              <1> DR_ERR:
   654 000034BB 800D[68420100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; SET ERROR CODE
   655 000034C2 EBEA                <1> 	JMP	SHORT RESBAC		; RETURN FROM RESET
   656                              <1> 
   657                              <1> ;-------------------------------------------------------------------------------
   658                              <1> ; DISK_STATUS	(AH = 01H)
   659                              <1> ;	DISKETTE STATUS.
   660                              <1> ;
   661                              <1> ; ON ENTRY:	AH : STATUS OF PREVIOUS OPERATION
   662                              <1> ;
   663                              <1> ; ON EXIT:	AH, @DSKETTE_STATUS, CY REFLECT STATUS OF PREVIOUS OPERATION.
   664                              <1> ;-------------------------------------------------------------------------------
   665                              <1> DSK_STATUS:
   666 000034C4 8825[68420100]      <1> 	MOV	[DSKETTE_STATUS],AH	; PUT BACK FOR SETUP END
   667 000034CA E801090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   668 000034CF 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   669 000034D2 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   670 000034D4 C3                  <1> 	RETn		
   671                              <1> 
   672                              <1> ;-------------------------------------------------------------------------------
   673                              <1> ; DISK_READ	(AH = 02H)	
   674                              <1> ;	DISKETTE READ.
   675                              <1> ;
   676                              <1> ; ON ENTRY:	DI	: DRIVE #
   677                              <1> ;		SI-HI	: HEAD #
   678                              <1> ;		SI-LOW	: # OF SECTORS
   679                              <1> ;		ES	: BUFFER SEGMENT
   680                              <1> ;		[BP]	: SECTOR #
   681                              <1> ;		[BP+1]	: TRACK #
   682                              <1> ;		[BP+2]	: BUFFER OFFSET
   683                              <1> ;
   684                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   685                              <1> ;-------------------------------------------------------------------------------
   686                              <1> 
   687                              <1> ; 06/02/2015, ES:BX -> EBX (unix386.s)
   688                              <1> 
   689                              <1> DSK_READ:
   690 000034D5 8025[66420100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   691 000034DC 66B846E6            <1> 	MOV	AX,0E646H		; AX = NEC COMMAND, DMA COMMAND
   692 000034E0 E83C040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   693 000034E5 C3                  <1> 	RETn
   694                              <1> 
   695                              <1> ;-------------------------------------------------------------------------------
   696                              <1> ; DISK_WRITE	(AH = 03H)
   697                              <1> ;	DISKETTE WRITE.
   698                              <1> ;
   699                              <1> ; ON ENTRY:	DI	: DRIVE #
   700                              <1> ;		SI-HI	: HEAD #
   701                              <1> ;		SI-LOW	: # OF SECTORS
   702                              <1> ;		ES	: BUFFER SEGMENT
   703                              <1> ;		[BP]	: SECTOR #
   704                              <1> ;		[BP+1]	: TRACK #
   705                              <1> ;		[BP+2]	: BUFFER OFFSET
   706                              <1> ;
   707                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   708                              <1> ;-------------------------------------------------------------------------------
   709                              <1> 
   710                              <1> ; 06/02/2015, ES:BX -> EBX (unix386.s)
   711                              <1> 
   712                              <1> DSK_WRITE:
   713 000034E6 66B84AC5            <1> 	MOV	AX,0C54AH		; AX = NEC COMMAND, DMA COMMAND
   714 000034EA 800D[66420100]80    <1>         OR      byte [MOTOR_STATUS],10000000B ; INDICATE WRITE OPERATION
   715 000034F1 E82B040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   716 000034F6 C3                  <1> 	RETn
   717                              <1> 
   718                              <1> ;-------------------------------------------------------------------------------
   719                              <1> ; DISK_VERF	(AH = 04H)
   720                              <1> ;	DISKETTE VERIFY.
   721                              <1> ;
   722                              <1> ; ON ENTRY:	DI	: DRIVE #
   723                              <1> ;		SI-HI	: HEAD #
   724                              <1> ;		SI-LOW	: # OF SECTORS
   725                              <1> ;		ES	: BUFFER SEGMENT
   726                              <1> ;		[BP]	: SECTOR #
   727                              <1> ;		[BP+1]	: TRACK #
   728                              <1> ;		[BP+2]	: BUFFER OFFSET
   729                              <1> ;
   730                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   731                              <1> ;-------------------------------------------------------------------------------
   732                              <1> DSK_VERF:
   733 000034F7 8025[66420100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   734 000034FE 66B842E6            <1> 	MOV	AX,0E642H		; AX = NEC COMMAND, DMA COMMAND
   735 00003502 E81A040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   736 00003507 C3                  <1> 	RETn
   737                              <1> 
   738                              <1> ;-------------------------------------------------------------------------------
   739                              <1> ; DISK_FORMAT	(AH = 05H)
   740                              <1> ;	DISKETTE FORMAT.
   741                              <1> ;
   742                              <1> ; ON ENTRY:	DI	: DRIVE #
   743                              <1> ;		SI-HI	: HEAD #
   744                              <1> ;		SI-LOW	: # OF SECTORS
   745                              <1> ;		ES	: BUFFER SEGMENT
   746                              <1> ;		[BP]	: SECTOR #
   747                              <1> ;		[BP+1]	: TRACK #
   748                              <1> ;		[BP+2]	: BUFFER OFFSET
   749                              <1> ;		@DISK_POINTER POINTS TO THE PARAMETER TABLE OF THIS DRIVE
   750                              <1> ;
   751                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   752                              <1> ;-------------------------------------------------------------------------------
   753                              <1> DSK_FORMAT:
   754 00003508 E853030000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
   755 0000350D E84F050000          <1> 	CALL	FMT_INIT		; ESTABLISH STATE IF UNESTABLISHED
   756 00003512 800D[66420100]80    <1>         OR      byte [MOTOR_STATUS], 10000000B ; INDICATE WRITE OPERATION
   757 00003519 E897050000          <1> 	CALL	MED_CHANGE		; CHECK MEDIA CHANGE AND RESET IF SO
   758 0000351E 725D                <1>         JC      short FM_DON            ; MEDIA CHANGED, SKIP
   759 00003520 E8F2020000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   760 00003525 E8FD050000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMPT RATE IS SAME AS LAST RATE
   761 0000352A 7405                <1>         JZ      short FM_WR             ; YES, SKIP SPECIFY COMMAND
   762 0000352C E8D4050000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO CONTROLLER
   763                              <1> FM_WR:
   764 00003531 E88A060000          <1> 	CALL	FMTDMA_SET		; SET UP THE DMA FOR FORMAT
   765 00003536 7245                <1>         JC      short FM_DON            ; RETURN WITH ERROR
   766 00003538 B44D                <1> 	MOV	AH,04DH			; ESTABLISH THE FORMAT COMMAND
   767 0000353A E8E7060000          <1> 	CALL	NEC_INIT		; INITIALIZE THE NEC
   768 0000353F 723C                <1>         JC      short FM_DON            ; ERROR - EXIT
   769 00003541 B8[7D350000]        <1>         MOV     eAX, FM_DON             ; LOAD ERROR ADDRESS
   770 00003546 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
   771 00003547 B203                <1> 	MOV	DL,3			; BYTES/SECTOR VALUE TO NEC
   772 00003549 E856090000          <1> 	CALL	GET_PARM
   773 0000354E E8570A0000          <1> 	CALL	NEC_OUTPUT
   774 00003553 B204                <1> 	MOV	DL,4			; SECTORS/TRACK VALUE TO NEC
   775 00003555 E84A090000          <1> 	CALL	GET_PARM
   776 0000355A E84B0A0000          <1> 	CALL	NEC_OUTPUT
   777 0000355F B207                <1> 	MOV	DL,7			; GAP LENGTH VALUE TO NEC
   778 00003561 E83E090000          <1> 	CALL	GET_PARM
   779 00003566 E83F0A0000          <1> 	CALL	NEC_OUTPUT
   780 0000356B B208                <1> 	MOV	DL,8			; FILLER BYTE TO NEC
   781 0000356D E832090000          <1> 	CALL	GET_PARM
   782 00003572 E8330A0000          <1> 	CALL	NEC_OUTPUT
   783 00003577 58                  <1> 	POP	eAX			; THROW AWAY ERROR
   784 00003578 E827070000          <1> 	CALL	NEC_TERM		; TERMINATE, RECEIVE STATUS, ETC,
   785                              <1> FM_DON:
   786 0000357D E80F030000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   787 00003582 E849080000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   788 00003587 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   789 0000358A 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   790 0000358C C3                  <1> 	RETn
   791                              <1> 
   792                              <1> ;-------------------------------------------------------------------------------
   793                              <1> ; FNC_ERR
   794                              <1> ;	INVALID FUNCTION REQUESTED OR INVALID DRIVE: 
   795                              <1> ;	SET BAD COMMAND IN STATUS.
   796                              <1> ;
   797                              <1> ; ON EXIT: 	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   798                              <1> ;-------------------------------------------------------------------------------
   799                              <1> FNC_ERR:				; INVALID FUNCTION REQUEST
   800 0000358D 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   801 00003590 B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   802 00003592 8825[68420100]      <1> 	MOV	[DSKETTE_STATUS],AH	; STORE IN DATA AREA
   803 00003598 F9                  <1> 	STC				; SET CARRY INDICATING ERROR
   804 00003599 C3                  <1> 	RETn
   805                              <1> 
   806                              <1> ; 01/06/2016
   807                              <1> ; 28/05/2016
   808                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v.2.0)
   809                              <1> ;-------------------------------------------------------------------------------
   810                              <1> ; DISK_PARMS	(AH = 08H)	
   811                              <1> ;	READ DRIVE PARAMETERS.
   812                              <1> ;
   813                              <1> ; ON ENTRY:	DI : DRIVE #
   814                              <1> ;		; 27/05/2016
   815                              <1> ;		EBX = Buffer Address for floppy disk parameters table (16 bytes)
   816                              <1> ;
   817                              <1> ; ON EXIT:	CL/[BP]   = BITS 7 & 6 HI 2 BITS OF MAX CYLINDER
   818                              <1> ;		            BITS 0-5 MAX SECTORS/TRACK
   819                              <1> ;		CH/[BP+1] = LOW 8 BITS OF MAX CYLINDER
   820                              <1> ;		BL/[BP+2] = BITS 7-4 = 0
   821                              <1> ;		            BITS 3-0 = VALID CMOS DRIVE TYPE
   822                              <1> ;		BH/[BP+3] = 0
   823                              <1> ;		DL/[BP+4] = # DRIVES INSTALLED (VALUE CHECKED)
   824                              <1> ;		DH/[BP+5] = MAX HEAD #
   825                              <1> ;	     ** 27/05/2016 - TRDOS 386 (TRDOS v2.0) **	
   826                              <1> ;            ** EBX = Buffer address for floppy disk parameters table **
   827                              <1> ;		;DI/[BP+6] = OFFSET TO DISK_BASE
   828                              <1> ;		;ES        = SEGMENT OF DISK_BASE
   829                              <1> ;
   830                              <1> ;		AX        = 0
   831                              <1> ;
   832                              <1> ;		NOTE : THE ABOVE INFORMATION IS STORED IN THE USERS STACK AT
   833                              <1> ;		       THE LOCATIONS WHERE THE MAIN ROUTINE WILL POP THEM
   834                              <1> ;		       INTO THE APPROPRIATE REGISTERS BEFORE RETURNING TO THE
   835                              <1> ;		       CALLER.
   836                              <1> ;-------------------------------------------------------------------------------
   837                              <1> DSK_PARMS:
   838 0000359A E8C1020000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH,
   839                              <1>      ;	MOV	WORD [BP+2],0		; DRIVE TYPE = 0
   840                              <1>      ;  MOV     AX, [EQUIP_FLAG]        ; LOAD EQUIPMENT FLAG FOR # DISKETTES
   841                              <1>      ;  AND     AL,11000001B            ; KEEP DISKETTE DRIVE BITS
   842                              <1>      ;  MOV     DL,2                    ; DISKETTE DRIVES = 2
   843                              <1>      ;  CMP     AL,01000001B            ; 2 DRIVES INSTALLED ?
   844                              <1>      ;  JZ      short STO_DL            ; IF YES JUMP
   845                              <1>      ;  DEC     DL                      ; DISKETTE DRIVES = 1
   846                              <1>      ;  CMP     AL,00000001B            ; 1 DRIVE INSTALLED ?
   847                              <1>      ;  JNZ     short NON_DRV           ; IF NO JUMP
   848 0000359F 29D2                <1> 	sub	edx, edx
   849 000035A1 66A1[565C0000]      <1> 	mov     ax, [fd0_type]
   850 000035A7 6621C0              <1> 	and     ax, ax
   851 000035AA 0F848A000000        <1>         jz      NON_DRV
   852 000035B0 FEC2                <1> 	inc     dl
   853 000035B2 20E4                <1> 	and     ah, ah
   854 000035B4 7402                <1> 	jz      short STO_DL
   855 000035B6 FEC2                <1> 	inc     dl
   856                              <1> STO_DL:
   857                              <1> 	;MOV	[BP+4],DL		; STORE NUMBER OF DRIVES
   858 000035B8 895508              <1> 	mov	[ebp+8], edx ; 20/02/2015	 	
   859 000035BB 6683FF01            <1> 	CMP	DI,1			; CHECK FOR VALID DRIVE
   860 000035BF 777C                <1> 	JA	short NON_DRV1		; DRIVE INVALID
   861                              <1> 	;MOV	BYTE [BP+5],1		; MAXIMUM HEAD NUMBER =	1
   862 000035C1 C6450901            <1> 	mov	byte [ebp+9], 1  ; 20/02/2015	
   863 000035C5 E8D1080000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL
   864                              <1> 	;;20/02/2015
   865                              <1> 	;;JC	short CHK_EST		; IF CMOS BAD CHECKSUM ESTABLISHED
   866                              <1> 	;;OR	AL,AL			; TEST FOR NO DRIVE TYPE
   867 000035CA 740F                <1> 	JZ	short CHK_EST		; JUMP IF SO
   868 000035CC E81B020000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   869 000035D1 7208                <1> 	JC	short CHK_EST		; TYPE NOT IN TABLE (POSSIBLE BAD CMOS)
   870                              <1> 	;MOV	[BP+2],AL		; STORE VALID CMOS DRIVE TYPE
   871                              <1>         ;mov	[ebp+4], al ; 06/02/2015
   872 000035D3 8A4B04              <1> 	MOV     CL, [eBX+MD.SEC_TRK]     ; GET SECTOR/TRACK
   873 000035D6 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]     ; GET MAX. TRACK NUMBER
   874 000035D9 EB36                <1> 	JMP	SHORT STO_CX		; CMOS GOOD, USE CMOS
   875                              <1> CHK_EST:
   876 000035DB 8AA7[75420100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; LOAD STATE FOR THIS DRIVE
   877 000035E1 F6C410              <1> 	TEST	AH,MED_DET		; CHECK FOR ESTABLISHED STATE
   878 000035E4 7457                <1> 	JZ	short NON_DRV1		; CMOS BAD/INVALID OR UNESTABLISHED
   879                              <1> USE_EST:
   880 000035E6 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE STATE
   881 000035E9 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
   882 000035EC 7570                <1> 	JNE	short USE_EST2		; NO, GO CHECK OTHER RATE
   883                              <1> 
   884                              <1> ;-----	DATA RATE IS 250 KBS, TRY 360 KB TABLE FIRST
   885                              <1> 
   886 000035EE B001                <1> 	MOV	AL,01			; DRIVE TYPE 1 (360KB)
   887 000035F0 E8F7010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   888 000035F5 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   889 000035F8 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   890 000035FB F687[75420100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; 80 TRACK ?
   891 00003602 740D                <1> 	JZ	short STO_CX		; MUST BE 360KB DRIVE 
   892                              <1> 
   893                              <1> ;-----	IT IS 1.44 MB DRIVE
   894                              <1> 
   895                              <1> PARM144:
   896 00003604 B004                <1> 	MOV	AL,04			; DRIVE TYPE 4 (1.44MB)
   897 00003606 E8E1010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   898 0000360B 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   899 0000360E 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   900                              <1> STO_CX:
   901 00003611 894D00              <1> 	MOV	[eBP],eCX		; SAVE POINTER IN STACK FOR RETURN
   902                              <1> ES_DI:
   903                              <1> 	;MOV	[BP+6],BX		; ADDRESS OF MEDIA/DRIVE PARM TABLE 
   904                              <1> 	;mov	[ebp+12], ebx ; 06/02/2015
   905                              <1> 	;MOV	AX,CS			; SEGMENT MEDIA/DRIVE PARAMETER TABLE
   906                              <1> 	;MOV	ES,AX			; ES IS SEGMENT OF TABLE
   907                              <1> 	;
   908                              <1> 	; 28/05/2016
   909                              <1> 	; 27/05/2016
   910                              <1> 	; return floppy disk parameters table to user
   911                              <1> 	; in user's buffer, which is pointed by EBX
   912                              <1> 	;
   913 00003614 57                  <1> 	push	edi
   914 00003615 8B7D04              <1> 	mov	edi, [ebp+4]  		; ebx (input), user's buffer address
   915 00003618 0FB6C0              <1> 	movzx	eax, al
   916 0000361B 894504              <1>         mov	[ebp+4], eax   ; ebx	; drive type (for floppy drives)
   917                              <1> 	; 01/06/2016 (INT 33h, disk type return for floppy disks, in BL)
   918 0000361E A3[704F0100]        <1> 	mov	[user_buffer], eax	; 01/06/2016 (overwrite ebx return value)
   919                              <1> 	;(INT 33h, Function 08h will replace user's buffer addr with disk type!)
   920                              <1> 	;
   921 00003623 89DE                <1> 	mov	esi, ebx 		; floppy disk parameter table (16 bytes)
   922 00003625 B910000000          <1> 	mov	ecx, 16 ; 16 bytes
   923 0000362A E89DB10000          <1>         call    transfer_to_user_buffer ; trdosk6.s (16/05/2016)
   924 0000362F 5F                  <1> 	pop	edi	
   925                              <1> DP_OUT:
   926 00003630 E85C020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   927 00003635 6631C0              <1> 	XOR	AX,AX			; CLEAR
   928 00003638 F8                  <1> 	CLC
   929 00003639 C3                  <1> 	RETn
   930                              <1> 
   931                              <1> ;-----	NO DRIYE PRESENT HANDLER
   932                              <1> 
   933                              <1> NON_DRV:
   934                              <1> 	;MOV	BYTE [BP+4],0		; CLEAR NUMBER OF DRIVES
   935 0000363A 895508              <1> 	mov	[ebp+8], edx ; 0 ; 20/02/2015
   936                              <1> NON_DRV1:
   937 0000363D 6681FF8000          <1> 	CMP	DI,80H			; CHECK FOR FIXED MEDIA TYPE REQUEST
   938 00003642 720C                <1> 	JB	short NON_DRV2		; CONTINUE IF NOT REQUEST FALL THROUGH
   939                              <1> 
   940                              <1> ;-----	FIXED DISK REQUEST FALL THROUGH ERROR
   941                              <1> 	
   942 00003644 E848020000          <1> 	CALL	XLAT_OLD		; ELSE TRANSLATE TO COMPATIBLE MODE
   943 00003649 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   944 0000364C B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   945 0000364E F9                  <1> 	STC
   946 0000364F C3                  <1> 	RETn
   947                              <1> 
   948                              <1> NON_DRV2:
   949                              <1> 	;XOR	AX,AX			; CLEAR PARMS IF NO DRIVES OR CMOS BAD
   950 00003650 31C0                <1> 	xor	eax, eax	
   951 00003652 66894500            <1> 	MOV	[eBP],AX		; TRACKS, SECTORS/TRACK = 0
   952                              <1> 	;MOV	[BP+5],AH		; HEAD = 0
   953 00003656 886509              <1> 	mov	[ebp+9], ah ; 06/02/2015
   954                              <1> 	;MOV	[BP+6],AX		; OFFSET TO DISK_BASE = 0
   955 00003659 89450C              <1> 	mov	[ebp+12], eax
   956                              <1> 	;MOV	ES,AX			; ES IS SEGMENT OF TABLE
   957 0000365C EBD2                <1> 	JMP	SHORT DP_OUT
   958                              <1> 
   959                              <1> ;-----	DATA RATE IS EITHER 300 KBS OR 500 KBS, TRY 1.2 MB TABLE FIRST
   960                              <1> 
   961                              <1> USE_EST2:
   962 0000365E B002                <1> 	MOV	AL,02			; DRIVE TYPE 2 (1.2MB)
   963 00003660 E887010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   964 00003665 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   965 00003668 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   966 0000366B 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
   967 0000366E 74A1                <1> 	JZ	short STO_CX		; MUST BE 1.2MB DRIVE
   968 00003670 EB92                <1> 	JMP	SHORT PARM144		; ELSE, IT IS 1.44MB DRIVE 
   969                              <1> 
   970                              <1> ;-------------------------------------------------------------------------------
   971                              <1> ; DISK_TYPE (AH = 15H)	
   972                              <1> ;	THIS ROUTINE RETURNS THE TYPE OF MEDIA INSTALLED.
   973                              <1> ;
   974                              <1> ;  ON ENTRY:	DI = DRIVE #
   975                              <1> ;
   976                              <1> ;  ON EXIT:	AH = DRIVE TYPE, CY=0
   977                              <1> ;-------------------------------------------------------------------------------
   978                              <1> DSK_TYPE:
   979 00003672 E8E9010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
   980 00003677 8A87[75420100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET PRESENT STATE INFORMATION
   981 0000367D 08C0                <1> 	OR	AL,AL			; CHECK FOR NO DRIVE
   982 0000367F 7418                <1> 	JZ	short NO_DRV
   983 00003681 B401                <1> 	MOV	AH,NOCHGLN		; NO CHANGE LINE FOR 40 TRACK DRIVE
   984 00003683 A801                <1> 	TEST	AL,TRK_CAPA		; IS THIS DRIVE AN 80 TRACK DRIVE?
   985 00003685 7402                <1> 	JZ	short DT_BACK			; IF NO JUMP
   986 00003687 B402                <1> 	MOV	AH,CHGLN		; CHANGE LINE FOR 80 TRACK DRIVE
   987                              <1> DT_BACK:
   988 00003689 6650                <1> 	PUSH	AX			; SAVE RETURN VALUE
   989 0000368B E801020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   990 00003690 6658                <1> 	POP	AX			; RESTORE RETURN VALUE
   991 00003692 F8                  <1> 	CLC				; NO ERROR
   992 00003693 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   993 00003696 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   994 00003698 C3                  <1> 	RETn
   995                              <1> NO_DRV:	
   996 00003699 30E4                <1> 	XOR	AH,AH			; NO DRIVE PRESENT OR UNKNOWN
   997 0000369B EBEC                <1> 	JMP	SHORT DT_BACK
   998                              <1> 
   999                              <1> ;-------------------------------------------------------------------------------
  1000                              <1> ; DISK_CHANGE	(AH = 16H)
  1001                              <1> ;	THIS ROUTINE RETURNS THE STATE OF THE DISK CHANGE LINE.
  1002                              <1> ;
  1003                              <1> ; ON ENTRY:	DI = DRIVE #
  1004                              <1> ;
  1005                              <1> ; ON EXIT:	AH = @DSKETTE_STATUS
  1006                              <1> ;		     00 - DISK CHANGE LINE INACTIVE, CY = 0
  1007                              <1> ;		     06 - DISK CHANGE LINE ACTIVE, CY = 1
  1008                              <1> ;-------------------------------------------------------------------------------
  1009                              <1> DSK_CHANGE:
  1010 0000369D E8BE010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1011 000036A2 8A87[75420100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET MEDIA STATE INFORMATION
  1012 000036A8 08C0                <1> 	OR	AL,AL			; DRIVE PRESENT ?
  1013 000036AA 7422                <1> 	JZ	short DC_NON		; JUMP IF NO DRIVE
  1014 000036AC A801                <1> 	TEST	AL,TRK_CAPA		; 80 TRACK DRIVE ?
  1015 000036AE 7407                <1> 	JZ	short SETIT		; IF SO , CHECK CHANGE LINE
  1016                              <1> DC0:
  1017 000036B0 E88D0A0000          <1>         CALL    READ_DSKCHNG            ; GO CHECK STATE OF DISK CHANGE LINE
  1018 000036B5 7407                <1> 	JZ	short FINIS		; CHANGE LINE NOT ACTIVE
  1019                              <1> 
  1020 000036B7 C605[68420100]06    <1> SETIT:	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; INDICATE MEDIA REMOVED
  1021                              <1> 
  1022 000036BE E8CE010000          <1> FINIS:	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1023 000036C3 E808070000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1024 000036C8 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
  1025 000036CB 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1026 000036CD C3                  <1> 	RETn
  1027                              <1> DC_NON:
  1028 000036CE 800D[68420100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; SET TIMEOUT, NO DRIVE
  1029 000036D5 EBE7                <1> 	JMP	SHORT FINIS
  1030                              <1> 
  1031                              <1> ;-------------------------------------------------------------------------------
  1032                              <1> ; FORMAT_SET	(AH = 17H)
  1033                              <1> ;	THIS ROUTINE IS USED TO ESTABLISH THE TYPE OF MEDIA TO BE USED
  1034                              <1> ;	FOR THE FOLLOWING FORMAT OPERATION.
  1035                              <1> ;
  1036                              <1> ; ON ENTRY:	SI LOW = DASD TYPE FOR FORMAT
  1037                              <1> ;		DI     = DRIVE #
  1038                              <1> ;
  1039                              <1> ; ON EXIT:	@DSKETTE_STATUS REFLECTS STATUS
  1040                              <1> ;		AH = @DSKETTE_STATUS
  1041                              <1> ;		CY = 1 IF ERROR
  1042                              <1> ;-------------------------------------------------------------------------------
  1043                              <1> FORMAT_SET:
  1044 000036D7 E884010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1045 000036DC 6656                <1> 	PUSH	SI			; SAVE DASD TYPE
  1046 000036DE 6689F0              <1> 	MOV	AX,SI			; AH = ? , AL , DASD TYPE
  1047 000036E1 30E4                <1> 	XOR	AH,AH			; AH , 0 , AL , DASD TYPE
  1048 000036E3 6689C6              <1> 	MOV	SI,AX			; SI = DASD TYPE
  1049 000036E6 80A7[75420100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1050 000036ED 664E                <1> 	DEC	SI			; CHECK FOR 320/360K MEDIA & DRIVE
  1051 000036EF 7509                <1> 	JNZ	short NOT_320		; BYPASS IF NOT
  1052 000036F1 808F[75420100]90    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_250 ; SET TO 320/360
  1053 000036F8 EB48                <1> 	JMP	SHORT S0
  1054                              <1> 
  1055                              <1> NOT_320:
  1056 000036FA E8B6030000          <1> 	CALL	MED_CHANGE		; CHECK FOR TIME_OUT
  1057 000036FF 803D[68420100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT
  1058 00003706 743A                <1> 	JZ	short S0		; IF TIME OUT TELL CALLER
  1059                              <1> S3:
  1060 00003708 664E                <1> 	DEC	SI			; CHECK FOR 320/360K IN 1.2M DRIVE
  1061 0000370A 7509                <1> 	JNZ	short NOT_320_12	; BYPASS IF NOT
  1062 0000370C 808F[75420100]70    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+DBL_STEP+RATE_300 ; SET STATE
  1063 00003713 EB2D                <1> 	JMP	SHORT S0
  1064                              <1> 
  1065                              <1> NOT_320_12:
  1066 00003715 664E                <1> 	DEC	SI			; CHECK FOR 1.2M MEDIA IN 1.2M DRIVE
  1067 00003717 7509                <1> 	JNZ	short NOT_12		; BYPASS IF NOT
  1068 00003719 808F[75420100]10    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_500 ; SET STATE VARIABLE
  1069 00003720 EB20                <1> 	JMP	SHORT S0		; RETURN TO CALLER
  1070                              <1> 
  1071                              <1> NOT_12:	
  1072 00003722 664E                <1> 	DEC	SI			; CHECK FOR SET DASD TYPE 04
  1073 00003724 752B                <1> 	JNZ	short FS_ERR		; BAD COMMAND EXIT IF NOT VALID TYPE
  1074                              <1> 
  1075 00003726 F687[75420100]04    <1> 	TEST	byte [DSK_STATE+eDI], DRV_DET ; DRIVE DETERMINED ?
  1076 0000372D 740B                <1> 	JZ	short ASSUME		; IF STILL NOT DETERMINED ASSUME
  1077 0000372F B050                <1> 	MOV	AL,MED_DET+RATE_300
  1078 00003731 F687[75420100]02    <1>         TEST    byte [DSK_STATE+eDI], FMT_CAPA ; MULTIPLE FORMAT CAPABILITY ?
  1079 00003738 7502                <1> 	JNZ	short OR_IT_IN		; IF 1.2 M THEN DATA RATE 300
  1080                              <1> 
  1081                              <1> ASSUME:
  1082 0000373A B090                <1> 	MOV	AL,MED_DET+RATE_250	; SET UP
  1083                              <1> 
  1084                              <1> OR_IT_IN:
  1085 0000373C 0887[75420100]      <1> 	OR	[DSK_STATE+eDI], AL	; OR IN THE CORRECT STATE
  1086                              <1> S0:
  1087 00003742 E84A010000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1088 00003747 E884060000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1089 0000374C 665B                <1> 	POP	BX			; GET SAVED AL TO BL
  1090 0000374E 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1091 00003750 C3                  <1> 	RETn
  1092                              <1> 
  1093                              <1> FS_ERR:
  1094 00003751 C605[68420100]01    <1> 	MOV	byte [DSKETTE_STATUS], BAD_CMD ; UNKNOWN STATE,BAD COMMAND
  1095 00003758 EBE8                <1> 	JMP	SHORT S0
  1096                              <1> 
  1097                              <1> ;-------------------------------------------------------------------------------
  1098                              <1> ; SET_MEDIA	(AH = 18H)
  1099                              <1> ;	THIS ROUTINE SETS THE TYPE OF MEDIA AND DATA RATE 
  1100                              <1> ;	TO BE USED FOR THE FOLLOWING FORMAT OPERATION.
  1101                              <1> ;
  1102                              <1> ; ON ENTRY:
  1103                              <1> ;	[BP]	= SECTOR PER TRACK
  1104                              <1> ;	[BP+1]	= TRACK #
  1105                              <1> ;	DI	= DRIVE #
  1106                              <1> ;
  1107                              <1> ; ON EXIT:
  1108                              <1> ;	@DSKETTE_STATUS REFLECTS STATUS
  1109                              <1> ;	IF NO ERROR:
  1110                              <1> ;		AH = 0
  1111                              <1> ;		CY = 0
  1112                              <1> ;		ES = SEGMENT OF MEDIA/DRIVE PARAMETER TABLE
  1113                              <1> ;		DI/[BP+6] = OFFSET OF MEDIA/DRIVE PARAMETER TABLE
  1114                              <1> ;	IF ERROR:	
  1115                              <1> ;		AH = @DSKETTE_STATUS
  1116                              <1> ;		CY = 1
  1117                              <1> ;-------------------------------------------------------------------------------
  1118                              <1> SET_MEDIA:
  1119 0000375A E801010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1120 0000375F F687[75420100]01    <1>         TEST    byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR CHANGE LINE AVAILABLE
  1121 00003766 7415                <1> 	JZ	short SM_CMOS		; JUMP IF 40 TRACK DRIVE
  1122 00003768 E848030000          <1> 	CALL	MED_CHANGE		; RESET CHANGE LINE
  1123 0000376D 803D[68420100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT ; IF TIME OUT TELL CALLER
  1124 00003774 746B                <1> 	JE	short SM_RTN
  1125 00003776 C605[68420100]00    <1> 	MOV	byte [DSKETTE_STATUS], 0 ; CLEAR STATUS
  1126                              <1> SM_CMOS:
  1127 0000377D E819070000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  1128                              <1> 	;;20/02/2015
  1129                              <1> 	;;JC	short MD_NOT_FND	; ERROR IN CMOS
  1130                              <1> 	;;OR	AL,AL			; TEST FOR NO DRIVE
  1131 00003782 745D                <1> 	JZ	short SM_RTN		; RETURN IF SO
  1132 00003784 E863000000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
  1133 00003789 7231                <1> 	JC	short MD_NOT_FND	; TYPE NOT IN TABLE (BAD CMOS)
  1134 0000378B 57                  <1> 	PUSH	eDI			; SAVE REG.
  1135 0000378C 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR. TYPE TABLE
  1136 0000378E B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1137                              <1> DR_SEARCH:
  1138 00003793 8AA3[D05B0000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1139 00003799 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1140 0000379C 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH ?
  1141 0000379E 7516                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT DRIVE TYPE
  1142                              <1> DR_FND:
  1143 000037A0 8BBB[D15B0000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAM TABLE
  1144                              <1> MD_SEARCH:
  1145 000037A6 8A6704              <1>         MOV     AH, [eDI+MD.SEC_TRK]    ; GET SECTOR/TRACK
  1146 000037A9 386500              <1> 	CMP	[eBP],AH		; MATCH?
  1147 000037AC 7508                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT MEDIA
  1148 000037AE 8A670B              <1>         MOV     AH, [eDI+MD.MAX_TRK]    ; GET MAX. TRACK #
  1149 000037B1 386501              <1> 	CMP 	[eBP+1],AH		; MATCH?
  1150 000037B4 740F                <1> 	JE	short MD_FND		; YES, GO GET RATE
  1151                              <1> NXT_MD:
  1152                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1153 000037B6 83C305              <1>         add	ebx, 5 ; 18/02/2015
  1154 000037B9 E2D8                <1> 	LOOP    DR_SEARCH
  1155 000037BB 5F                  <1> 	POP	eDI			; RESTORE REG.
  1156                              <1> MD_NOT_FND:
  1157 000037BC C605[68420100]0C    <1> 	MOV	byte [DSKETTE_STATUS], MED_NOT_FND ; ERROR, MEDIA TYPE NOT FOUND
  1158 000037C3 EB1C                <1> 	JMP	SHORT SM_RTN		; RETURN
  1159                              <1> MD_FND:
  1160 000037C5 8A470C              <1>         MOV     AL, [eDI+MD.RATE]       ; GET RATE
  1161 000037C8 3C40                <1> 	CMP	AL,RATE_300		; DOUBLE STEP REQUIRED FOR RATE 300
  1162 000037CA 7502                <1> 	JNE	short MD_SET
  1163 000037CC 0C20                <1> 	OR	AL,DBL_STEP
  1164                              <1> MD_SET:
  1165                              <1> 	;MOV	[BP+6],DI		; SAVE TABLE POINTER IN STACK
  1166 000037CE 897D0C              <1> 	mov	[ebp+12], edi ; 18/02/2015
  1167 000037D1 0C10                <1> 	OR	AL,MED_DET		; SET MEDIA ESTABLISHED
  1168 000037D3 5F                  <1> 	POP	eDI
  1169 000037D4 80A7[75420100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1170 000037DB 0887[75420100]      <1> 	OR	[DSK_STATE+eDI], AL
  1171                              <1> 	;MOV	AX, CS			; SEGMENT OF MEDIA/DRIVE PARAMETER TABLE
  1172                              <1> 	;MOV	ES, AX			; ES IS SEGMENT OF TABLE
  1173                              <1> SM_RTN:
  1174 000037E1 E8AB000000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1175 000037E6 E8E5050000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1176 000037EB C3                  <1> 	RETn
  1177                              <1> 
  1178                              <1> ;----------------------------------------------------------------
  1179                              <1> ; DR_TYPE_CHECK							:
  1180                              <1> ;	CHECK IF THE GIVEN DRIVE TYPE IN REGISTER (AL)		:
  1181                              <1> ;	IS SUPPORTED IN BIOS DRIVE TYPE TABLE			:
  1182                              <1> ; ON ENTRY:							:
  1183                              <1> ;	AL = DRIVE TYPE						:
  1184                              <1> ; ON EXIT:							:
  1185                              <1> ;	CS = SEGMENT MEDIA/DRIVE PARAMETER TABLE (CODE)		:
  1186                              <1> ;	CY = 0 	DRIVE TYPE SUPPORTED				:
  1187                              <1> ;	     BX = OFFSET TO MEDIA/DRIVE PARAMETER TABLE		:
  1188                              <1> ;	CY = 1	DRIVE TYPE NOT SUPPORTED 			:
  1189                              <1> ; REGISTERS ALTERED: eBX						:
  1190                              <1> ;----------------------------------------------------------------		
  1191                              <1> DR_TYPE_CHECK:
  1192 000037EC 6650                <1> 	PUSH	AX			
  1193 000037EE 51                  <1> 	PUSH	eCX
  1194 000037EF 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1195 000037F1 B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1196                              <1> TYPE_CHK:	
  1197 000037F6 8AA3[D05B0000]      <1> 	MOV	AH,[DR_TYPE+eBX]	; GET DRIVE TYPE
  1198 000037FC 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1199 000037FE 740D                <1> 	JE	short DR_TYPE_VALID	; YES, RETURN WITH CARRY RESET
  1200                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1201 00003800 83C305              <1>         add	ebx, 5	; 16/02/2015 (32 bit address modification)
  1202 00003803 E2F1                <1> 	LOOP    TYPE_CHK
  1203                              <1> 	;
  1204 00003805 BB[2F5C0000]        <1> 	mov	ebx, MD_TBL6		; 1.44MB fd parameter table
  1205                              <1> 					; Default for GET_PARM (11/12/2014)
  1206                              <1> 	;
  1207 0000380A F9                  <1> 	STC				; DRIVE TYPE NOT FOUND IN TABLE
  1208 0000380B EB06                <1> 	JMP	SHORT TYPE_RTN
  1209                              <1> DR_TYPE_VALID:
  1210 0000380D 8B9B[D15B0000]      <1> 	MOV	eBX,[DR_TYPE+eBX+1] 	; BX = MEDIA TABLE
  1211                              <1> TYPE_RTN:
  1212 00003813 59                  <1> 	POP	eCX
  1213 00003814 6658                <1> 	POP	AX
  1214 00003816 C3                  <1> 	RETn	
  1215                              <1> 		
  1216                              <1> ;----------------------------------------------------------------
  1217                              <1> ; SEND_SPEC							:
  1218                              <1> ;	SEND THE SPECIFY COMMAND TO CONTROLLER USING DATA FROM	:
  1219                              <1> ;	THE DRIVE PARAMETER TABLE POINTED BY @DISK_POINTER	:
  1220                              <1> ; ON ENTRY:	@DISK_POINTER = DRIVE PARAMETER TABLE		:
  1221                              <1> ; ON EXIT:	NONE						:	
  1222                              <1> ; REGISTERS ALTERED: CX, DX					:
  1223                              <1> ;----------------------------------------------------------------		
  1224                              <1> SEND_SPEC:
  1225 00003817 50                  <1> 	PUSH	eAX			; SAVE AX
  1226 00003818 B8[3E380000]        <1> 	MOV	eAX, SPECBAC		; LOAD ERROR ADDRESS
  1227 0000381D 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1228 0000381E B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1229 00003820 E885070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1230 00003825 28D2                <1> 	SUB	DL,DL			; FIRST SPECIFY BYTE
  1231 00003827 E878060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1232 0000382C E879070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1233 00003831 B201                <1> 	MOV	DL,1			; SECOND SPECIFY BYTE
  1234 00003833 E86C060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1235 00003838 E86D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1236 0000383D 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1237                              <1> SPECBAC:
  1238 0000383E 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1239 0000383F C3                  <1> 	RETn
  1240                              <1> 
  1241                              <1> ;----------------------------------------------------------------
  1242                              <1> ; SEND_SPEC_MD							:
  1243                              <1> ;	SEND THE SPECIFY COMMAND TO CONTROLLER USING DATA FROM	:
  1244                              <1> ;	THE MEDIA/DRIVE PARAMETER TABLE POINTED BY (CS:BX)	:
  1245                              <1> ; ON ENTRY:	CS:BX = MEDIA/DRIVE PARAMETER TABLE		:
  1246                              <1> ; ON EXIT:	NONE						:	
  1247                              <1> ; REGISTERS ALTERED: AX						:
  1248                              <1> ;----------------------------------------------------------------		
  1249                              <1> SEND_SPEC_MD:
  1250 00003840 50                  <1> 	PUSH	eAX			; SAVE RATE DATA
  1251 00003841 B8[5E380000]        <1> 	MOV	eAX, SPEC_ESBAC		; LOAD ERROR ADDRESS
  1252 00003846 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1253 00003847 B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1254 00003849 E85C070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1255 0000384E 8A23                <1>         MOV     AH, [eBX+MD.SPEC1]      ; GET 1ST SPECIFY BYTE
  1256 00003850 E855070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1257 00003855 8A6301              <1>         MOV     AH, [eBX+MD.SPEC2]      ; GET SECOND SPECIFY BYTE
  1258 00003858 E84D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1259 0000385D 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1260                              <1> SPEC_ESBAC:
  1261 0000385E 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1262 0000385F C3                  <1> 	RETn
  1263                              <1> 
  1264                              <1> ;-------------------------------------------------------------------------------
  1265                              <1> ; XLAT_NEW  
  1266                              <1> ;	TRANSLATES DISKETTE STATE LOCATIONS FROM COMPATIBLE
  1267                              <1> ;	MODE TO NEW ARCHITECTURE.
  1268                              <1> ;
  1269                              <1> ; ON ENTRY:	DI = DRIVE #
  1270                              <1> ;-------------------------------------------------------------------------------
  1271                              <1> XLAT_NEW:
  1272 00003860 83FF01              <1> 	CMP	eDI,1				; VALID DRIVE
  1273 00003863 7725                <1> 	JA	short XN_OUT			; IF INVALID BACK
  1274 00003865 80BF[75420100]00    <1> 	CMP	byte [DSK_STATE+eDI], 0		; NO DRIVE ?
  1275 0000386C 741D                <1> 	JZ	short DO_DET			; IF NO DRIVE ATTEMPT DETERMINE
  1276 0000386E 6689F9              <1> 	MOV	CX,DI				; CX = DRIVE NUMBER
  1277 00003871 C0E102              <1> 	SHL	CL,2				; CL = SHIFT COUNT, A=0, B=4
  1278 00003874 A0[74420100]        <1> 	MOV	AL, [HF_CNTRL]			; DRIVE INFORMATION
  1279 00003879 D2C8                <1> 	ROR	AL,CL				; TO LOW NIBBLE
  1280 0000387B 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA	; KEEP DRIVE BITS
  1281 0000387D 80A7[75420100]F8    <1>         AND     byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA)
  1282 00003884 0887[75420100]      <1> 	OR	[DSK_STATE+eDI], AL		; UPDATE DRIVE STATE
  1283                              <1> XN_OUT:
  1284 0000388A C3                  <1> 	RETn
  1285                              <1> DO_DET:
  1286 0000388B E8BF080000          <1> 	CALL	DRIVE_DET			; TRY TO DETERMINE
  1287 00003890 C3                  <1> 	RETn
  1288                              <1> 
  1289                              <1> ;-------------------------------------------------------------------------------
  1290                              <1> ; XLAT_OLD 
  1291                              <1> ;	TRANSLATES DISKETTE STATE LOCATIONS FROM NEW
  1292                              <1> ;	ARCHITECTURE TO COMPATIBLE MODE.
  1293                              <1> ;
  1294                              <1> ; ON ENTRY:	DI = DRIVE
  1295                              <1> ;-------------------------------------------------------------------------------
  1296                              <1> XLAT_OLD:
  1297 00003891 83FF01              <1> 	CMP	eDI,1			; VALID DRIVE ?
  1298                              <1>         ;JA     short XO_OUT            ; IF INVALID BACK
  1299 00003894 0F8786000000        <1>         ja      XO_OUT
  1300 0000389A 80BF[75420100]00    <1>         CMP	byte [DSK_STATE+eDI],0	; NO DRIVE ?
  1301 000038A1 747D                <1> 	JZ	short XO_OUT		; IF NO DRIVE TRANSLATE DONE
  1302                              <1> 
  1303                              <1> ;-----	TEST FOR SAVED DRIVE INFORMATION ALREADY SET
  1304                              <1> 
  1305 000038A3 6689F9              <1> 	MOV	CX,DI			; CX = DRIVE NUMBER
  1306 000038A6 C0E102              <1> 	SHL	CL,2			; CL = SHIFT COUNT, A=0, B=4
  1307 000038A9 B402                <1> 	MOV	AH,FMT_CAPA		; LOAD MULTIPLE DATA RATE BIT MASK
  1308 000038AB D2CC                <1> 	ROR	AH,CL			; ROTATE BY MASK
  1309 000038AD 8425[74420100]      <1> 	TEST	[HF_CNTRL], AH		; MULTIPLE-DATA RATE DETERMINED ?
  1310 000038B3 751C                <1> 	JNZ	short SAVE_SET		; IF SO, NO NEED TO RE-SAVE
  1311                              <1> 
  1312                              <1> ;-----	ERASE DRIVE BITS IN @HF_CNTRL FOR THIS DRIVE
  1313                              <1> 
  1314 000038B5 B407                <1> 	MOV	AH,DRV_DET+FMT_CAPA+TRK_CAPA ; MASK TO KEEP
  1315 000038B7 D2CC                <1> 	ROR	AH,CL			; FIX MASK TO KEEP
  1316 000038B9 F6D4                <1> 	NOT	AH			; TRANSLATE MASK
  1317 000038BB 2025[74420100]      <1> 	AND	[HF_CNTRL], AH		; KEEP BITS FROM OTHER DRIVE INTACT
  1318                              <1> 
  1319                              <1> ;-----	ACCESS CURRENT DRIVE BITS AND STORE IN @HF_CNTRL
  1320                              <1> 
  1321 000038C1 8A87[75420100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; ACCESS STATE
  1322 000038C7 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA ; KEEP DRIVE BITS
  1323 000038C9 D2C8                <1> 	ROR	AL,CL			; FIX FOR THIS DRIVE
  1324 000038CB 0805[74420100]      <1> 	OR	[HF_CNTRL], AL		; UPDATE SAVED DRIVE STATE
  1325                              <1> 
  1326                              <1> ;-----	TRANSLATE TO COMPATIBILITY MODE
  1327                              <1> 
  1328                              <1> SAVE_SET:
  1329 000038D1 8AA7[75420100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  1330 000038D7 88E7                <1> 	MOV	BH,AH			; TO BH FOR LATER
  1331 000038D9 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE
  1332 000038DC 80FC00              <1> 	CMP	AH,RATE_500		; RATE 500 ?
  1333 000038DF 7410                <1> 	JZ	short CHK_144		; YES 1.2/1.2 OR 1.44/1.44
  1334 000038E1 B001                <1> 	MOV	AL,M3D1U		; AL = 360 IN 1.2 UNESTABLISHED
  1335 000038E3 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
  1336 000038E6 7518                <1> 	JNZ	short CHK_250		; NO, 360/360, 720/720 OR 720/1.44
  1337 000038E8 F6C720              <1> 	TEST	BH,DBL_STEP		; CHECK FOR DOUBLE STEP
  1338 000038EB 751F                <1> 	JNZ	short TST_DET		; MUST BE 360 IN 1.2
  1339                              <1> UNKNO:
  1340 000038ED B007                <1> 	MOV	AL,MED_UNK		; NONE OF THE ABOVE
  1341 000038EF EB22                <1> 	JMP	SHORT AL_SET		; PROCESS COMPLETE
  1342                              <1> CHK_144:
  1343 000038F1 E8A5050000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  1344                              <1> 	;;20/02/2015
  1345                              <1> 	;;JC	short UNKNO		; ERROR, SET 'NONE OF ABOVE'
  1346 000038F6 74F5                <1> 	jz	short UNKNO ;; 20/02/2015
  1347 000038F8 3C02                <1> 	CMP	AL,2			; 1.2MB DRIVE ?
  1348 000038FA 75F1                <1> 	JNE	short UNKNO		; NO, GO SET 'NONE OF ABOVE'
  1349 000038FC B002                <1> 	MOV	AL,M1D1U		; AL = 1.2 IN 1.2 UNESTABLISHED
  1350 000038FE EB0C                <1> 	JMP	SHORT TST_DET
  1351                              <1> CHK_250:
  1352 00003900 B000                <1> 	MOV	AL,M3D3U		; AL = 360 IN 360 UNESTABLISHED
  1353 00003902 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
  1354 00003905 75E6                <1> 	JNZ	short UNKNO		; IF SO FALL IHRU
  1355 00003907 F6C701              <1> 	TEST	BH,TRK_CAPA		; 80 TRACK CAPABILITY ?
  1356 0000390A 75E1                <1> 	JNZ	short UNKNO		; IF SO JUMP, FALL THRU TEST DET
  1357                              <1> TST_DET:
  1358 0000390C F6C710              <1> 	TEST	BH,MED_DET		; DETERMINED ?
  1359 0000390F 7402                <1> 	JZ	short AL_SET		; IF NOT THEN SET
  1360 00003911 0403                <1> 	ADD	AL,3			; MAKE DETERMINED/ESTABLISHED
  1361                              <1> AL_SET:
  1362 00003913 80A7[75420100]F8    <1> 	AND	byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA) ; CLEAR DRIVE
  1363 0000391A 0887[75420100]      <1> 	OR	[DSK_STATE+eDI], AL	; REPLACE WITH COMPATIBLE MODE
  1364                              <1> XO_OUT:
  1365 00003920 C3                  <1> 	RETn
  1366                              <1> 
  1367                              <1> ;-------------------------------------------------------------------------------
  1368                              <1> ; RD_WR_VF
  1369                              <1> ;	COMMON READ, WRITE AND VERIFY: 
  1370                              <1> ;	MAIN LOOP FOR STATE RETRIES.
  1371                              <1> ;
  1372                              <1> ; ON ENTRY:	AH = READ/WRITE/VERIFY NEC PARAMETER
  1373                              <1> ;		AL = READ/WRITE/VERIFY DMA PARAMETER
  1374                              <1> ;
  1375                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1376                              <1> ;-------------------------------------------------------------------------------
  1377                              <1> RD_WR_VF:
  1378 00003921 6650                <1> 	PUSH	AX			; SAVE DMA, NEC PARAMETERS
  1379 00003923 E838FFFFFF          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1380 00003928 E8F3000000          <1> 	CALL	SETUP_STATE		; INITIALIZE START AND END RATE
  1381 0000392D 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1382                              <1> DO_AGAIN:
  1383 0000392F 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1384 00003931 E87F010000          <1> 	CALL	MED_CHANGE		; MEDIA CHANGE AND RESET IF CHANGED
  1385 00003936 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1386 00003938 0F82C9000000        <1>         JC      RWV_END                 ; MEDIA CHANGE ERROR OR TIME-OUT
  1387                              <1> RWV:
  1388 0000393E 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1389 00003940 8AB7[75420100]      <1> 	MOV	DH, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1390 00003946 80E6C0              <1> 	AND	DH,RATE_MSK		; KEEP ONLY RATE
  1391 00003949 E84D050000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL (AL)
  1392                              <1> 	;;20/02/2015
  1393                              <1> 	;;JC	short RWV_ASSUME	; ERROR IN CMOS
  1394 0000394E 7451                <1> 	jz	short RWV_ASSUME ; 20/02/2015
  1395 00003950 3C01                <1> 	CMP	AL,1			; 40 TRACK DRIVE?
  1396 00003952 750D                <1> 	JNE	short RWV_1		; NO, BYPASS CMOS VALIDITY CHECK
  1397 00003954 F687[75420100]01    <1> 	TEST	byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR 40 TRACK DRIVE
  1398 0000395B 7413                <1> 	JZ	short RWV_2		; YES, CMOS IS CORRECT
  1399 0000395D B002                <1> 	MOV	AL,2			; CHANGE TO 1.2M
  1400 0000395F EB0F                <1> 	JMP	SHORT RWV_2
  1401                              <1> RWV_1:
  1402 00003961 720D                <1> 	JB	short RWV_2		; NO DRIVE SPECIFIED, CONTINUE
  1403 00003963 F687[75420100]01    <1> 	TEST    byte [DSK_STATE+eDI], TRK_CAPA ; IS IT REALLY 40 TRACK?
  1404 0000396A 7504                <1> 	JNZ	short RWV_2		; NO, 80 TRACK
  1405 0000396C B001                <1> 	MOV	AL,1			; IT IS 40 TRACK, FIX CMOS VALUE
  1406 0000396E EB04                <1> 	jmp	short rwv_3
  1407                              <1> RWV_2:
  1408 00003970 08C0                <1> 	OR	AL,AL			; TEST FOR NO DRIVE
  1409 00003972 742D                <1> 	JZ	short RWV_ASSUME	; ASSUME TYPE, USE MAX TRACK
  1410                              <1> rwv_3:
  1411 00003974 E873FEFFFF          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL.
  1412 00003979 7226                <1> 	JC	short RWV_ASSUME	; TYPE NOT IN TABLE (BAD CMOS)
  1413                              <1> 
  1414                              <1> ;-----	SEARCH FOR MEDIA/DRIVE PARAMETER TABLE
  1415                              <1> 
  1416 0000397B 57                  <1> 	PUSH	eDI			; SAVE DRIVE #
  1417 0000397C 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1418 0000397E B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1419                              <1> RWV_DR_SEARCH:
  1420 00003983 8AA3[D05B0000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1421 00003989 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1422 0000398C 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1423 0000398E 750B                <1> 	JNE	short RWV_NXT_MD	; NO, CHECK NEXT DRIVE TYPE
  1424                              <1> RWV_DR_FND:
  1425 00003990 8BBB[D15B0000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAMETER TABLE
  1426                              <1> RWV_MD_SEARH:
  1427 00003996 3A770C              <1>         CMP     DH, [eDI+MD.RATE]       ; MATCH?
  1428 00003999 741B                <1> 	JE	short RWV_MD_FND	; YES, GO GET 1ST SPECIFY BYTE
  1429                              <1> RWV_NXT_MD:
  1430                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1431 0000399B 83C305              <1> 	add	eBX, 5
  1432 0000399E E2E3                <1> 	LOOP	RWV_DR_SEARCH
  1433 000039A0 5F                  <1> 	POP	eDI			; RESTORE DRIVE #
  1434                              <1> 
  1435                              <1> ;-----	ASSUME PRIMARY DRIVE IS INSTALLED AS SHIPPED
  1436                              <1> 
  1437                              <1> RWV_ASSUME:
  1438 000039A1 BB[EE5B0000]        <1> 	MOV	eBX, MD_TBL1		; POINT TO 40 TRACK 250 KBS
  1439 000039A6 F687[75420100]01    <1> 	TEST 	byte [DSK_STATE+eDI], TRK_CAPA ; TEST FOR 80 TRACK
  1440 000039AD 740A                <1> 	JZ	short RWV_MD_FND1	; MUST BE 40 TRACK
  1441 000039AF BB[085C0000]        <1> 	MOV	eBX, MD_TBL3		; POINT TO 80 TRACK 500 KBS
  1442 000039B4 EB03                <1> 	JMP	short RWV_MD_FND1	; GO SPECIFY PARAMTERS
  1443                              <1> 
  1444                              <1> ;-----	CS:BX POINTS TO MEDIA/DRIVE PARAMETER TABLE
  1445                              <1> 	 			
  1446                              <1> RWV_MD_FND:
  1447 000039B6 89FB                <1> 	MOV	eBX,eDI			; BX = MEDIA/DRIVE PARAMETER TABLE
  1448 000039B8 5F                  <1> 	POP	eDI			; RESTORE DRIVE #
  1449                              <1> 	
  1450                              <1> ;-----	SEND THE SPECIFY COMMAND TO THE CONTROLLER
  1451                              <1> 
  1452                              <1> RWV_MD_FND1:
  1453 000039B9 E882FEFFFF          <1> 	CALL	SEND_SPEC_MD
  1454 000039BE E864010000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMP RATE IS SAME AS LAST RATE
  1455 000039C3 7405                <1> 	JZ	short RWV_DBL		; YES,SKIP SEND RATE COMMAND
  1456 000039C5 E83B010000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO NEC
  1457                              <1> RWV_DBL:
  1458 000039CA 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1459 000039CB E822040000          <1> 	CALL	SETUP_DBL		; CHECK FOR DOUBLE STEP
  1460 000039D0 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1461 000039D1 7226                <1> 	JC	short CHK_RET		; ERROR FROM READ ID, POSSIBLE RETRY
  1462 000039D3 6658                <1> 	POP	AX			; RESTORE NEC, DMA COMMAND
  1463 000039D5 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1464 000039D7 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1465 000039D8 E861010000          <1> 	CALL	DMA_SETUP		; SET UP THE DMA
  1466 000039DD 5B                  <1> 	POP	eBX 
  1467 000039DE 6658                <1> 	POP	AX			; RESTORE NEC COMMAND
  1468 000039E0 722F                <1> 	JC	short RWV_BAC		; CHECK FOR DMA BOUNDARY ERROR
  1469 000039E2 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1470 000039E4 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1471 000039E5 E83C020000          <1> 	CALL	NEC_INIT		; INITIALIZE NEC
  1472 000039EA 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1473 000039EB 720C                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1474 000039ED E866020000          <1> 	CALL	RWV_COM			; OP CODE COMMON TO READ/WRITE/VERIFY
  1475 000039F2 7205                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1476 000039F4 E8AB020000          <1> 	CALL	NEC_TERM		; TERMINATE, GET STATUS, ETC.
  1477                              <1> CHK_RET:
  1478 000039F9 E84A030000          <1> 	CALL	RETRY			; CHECK FOR, SETUP RETRY
  1479 000039FE 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY PARAMETER
  1480 00003A00 7305                <1> 	JNC	short RWV_END		; CY = 0 NO RETRY
  1481 00003A02 E928FFFFFF          <1>         JMP     DO_AGAIN                ; CY = 1 MEANS RETRY
  1482                              <1> RWV_END:
  1483 00003A07 E8F4020000          <1> 	CALL	DSTATE			; ESTABLISH STATE IF SUCCESSFUL
  1484 00003A0C E887030000          <1> 	CALL	NUM_TRANS		; AL = NUMBER TRANSFERRED
  1485                              <1> RWV_BAC:				; BAD DMA ERROR ENTRY
  1486 00003A11 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  1487 00003A13 E879FEFFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1488 00003A18 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  1489 00003A1A E8B1030000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1490 00003A1F C3                  <1> 	RETn
  1491                              <1> 
  1492                              <1> ;-------------------------------------------------------------------------------
  1493                              <1> ; SETUP_STATE:	INITIALIZES START AND END RATES.
  1494                              <1> ;-------------------------------------------------------------------------------
  1495                              <1> SETUP_STATE:
  1496 00003A20 F687[75420100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; MEDIA DETERMINED ?
  1497 00003A27 7537                <1> 	JNZ	short J1C		; NO STATES IF DETERMINED
  1498 00003A29 66B84000            <1>         MOV     AX,(RATE_500*256)+RATE_300  ; AH = START RATE, AL = END RATE
  1499 00003A2D F687[75420100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE ?
  1500 00003A34 740D                <1> 	JZ	short AX_SET		; DO NOT KNOW DRIVE
  1501 00003A36 F687[75420100]02    <1> 	TEST	byte [DSK_STATE+eDI], FMT_CAPA ; MULTI-RATE?
  1502 00003A3D 7504                <1> 	JNZ	short AX_SET		; JUMP IF YES
  1503 00003A3F 66B88080            <1>         MOV     AX,RATE_250*257         ; START A END RATE 250 FOR 360 DRIVE
  1504                              <1> AX_SET:	
  1505 00003A43 80A7[75420100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP) ; TURN OFF THE RATE
  1506 00003A4A 08A7[75420100]      <1> 	OR	[DSK_STATE+eDI], AH	; RATE FIRST TO TRY
  1507 00003A50 8025[70420100]F3    <1> 	AND	byte [LASTRATE], ~STRT_MSK ; ERASE LAST TO TRY RATE BITS
  1508 00003A57 C0C804              <1> 	ROR	AL,4			; TO OPERATION LAST RATE LOCATION
  1509 00003A5A 0805[70420100]      <1> 	OR	[LASTRATE], AL		; LAST RATE
  1510                              <1> J1C:	
  1511 00003A60 C3                  <1> 	RETn
  1512                              <1> 
  1513                              <1> ;-------------------------------------------------------------------------------
  1514                              <1> ;  FMT_INIT: ESTABLISH STATE IF UNESTABLISHED AT FORMAT TIME.
  1515                              <1> ;-------------------------------------------------------------------------------
  1516                              <1> FMT_INIT:
  1517 00003A61 F687[75420100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; IS MEDIA ESTABLISHED
  1518 00003A68 7546                <1> 	JNZ	short F1_OUT		; IF SO RETURN
  1519 00003A6A E82C040000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL
  1520                              <1> 	;; 20/02/2015
  1521                              <1> 	;;JC	short CL_DRV		; ERROR IN CMOS ASSUME NO DRIVE
  1522 00003A6F 7440                <1> 	jz	short CL_DRV ;; 20/02/2015
  1523 00003A71 FEC8                <1> 	DEC	AL			; MAKE ZERO ORIGIN
  1524                              <1> 	;;JS	short CL_DRV		; NO DRIVE IF AL 0
  1525 00003A73 8AA7[75420100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; AH = CURRENT STATE
  1526 00003A79 80E40F              <1> 	AND	AH, ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR
  1527 00003A7C 08C0                <1> 	OR	AL,AL			; CHECK FOR 360
  1528 00003A7E 7505                <1> 	JNZ	short N_360		; IF 360 WILL BE 0
  1529 00003A80 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; ESTABLISH MEDIA
  1530 00003A83 EB25                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1531                              <1> N_360:	
  1532 00003A85 FEC8                <1> 	DEC	AL			; 1.2 M DRIVE
  1533 00003A87 7505                <1> 	JNZ	short N_12		; JUMP IF NOT
  1534                              <1> F1_RATE:
  1535 00003A89 80CC10              <1> 	OR	AH,MED_DET+RATE_500	; SET FORMAT RATE
  1536 00003A8C EB1C                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1537                              <1> N_12:	
  1538 00003A8E FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 3
  1539 00003A90 750F                <1> 	JNZ	short N_720		; JUMP IF NOT
  1540 00003A92 F6C404              <1> 	TEST	AH,DRV_DET		; IS DRIVE DETERMINED
  1541 00003A95 7410                <1> 	JZ	short ISNT_12		; TREAT AS NON 1.2 DRIVE
  1542 00003A97 F6C402              <1> 	TEST	AH,FMT_CAPA		; IS 1.2M
  1543 00003A9A 740B                <1> 	JZ	short ISNT_12		; JUMP IF NOT
  1544 00003A9C 80CC50              <1> 	OR	AH,MED_DET+RATE_300	; RATE 300
  1545 00003A9F EB09                <1> 	JMP	SHORT SKP_STATE		; CONTINUE
  1546                              <1> N_720:
  1547 00003AA1 FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 4
  1548 00003AA3 750C                <1> 	JNZ	short CL_DRV		; NO DRIVE, CMOS BAD
  1549 00003AA5 EBE2                <1> 	JMP	SHORT F1_RATE
  1550                              <1> ISNT_12: 
  1551 00003AA7 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; MUST BE RATE 250
  1552                              <1> 
  1553                              <1> SKP_STATE:
  1554 00003AAA 88A7[75420100]      <1> 	MOV	[DSK_STATE+eDI], AH	; STORE AWAY
  1555                              <1> F1_OUT:
  1556 00003AB0 C3                  <1> 	RETn
  1557                              <1> CL_DRV:	
  1558 00003AB1 30E4                <1> 	XOR	AH,AH			; CLEAR STATE
  1559 00003AB3 EBF5                <1> 	JMP	SHORT SKP_STATE		; SAVE IT
  1560                              <1> 
  1561                              <1> ;-------------------------------------------------------------------------------
  1562                              <1> ; MED_CHANGE	
  1563                              <1> ;	CHECKS FOR MEDIA CHANGE, RESETS MEDIA CHANGE, 
  1564                              <1> ;	CHECKS MEDIA CHANGE AGAIN.
  1565                              <1> ;
  1566                              <1> ; ON EXIT:	CY = 1 MEANS MEDIA CHANGE OR TIMEOUT
  1567                              <1> ;		@DSKETTE_STATUS = ERROR CODE
  1568                              <1> ;-------------------------------------------------------------------------------
  1569                              <1> MED_CHANGE:
  1570 00003AB5 E888060000          <1> 	CALL	READ_DSKCHNG		; READ DISK CHANCE LINE STATE
  1571 00003ABA 7447                <1> 	JZ	short MC_OUT		; BYPASS HANDLING DISK CHANGE LINE
  1572 00003ABC 80A7[75420100]EF    <1> 	AND	byte [DSK_STATE+eDI], ~MED_DET ; CLEAR STATE FOR THIS DRIVE
  1573                              <1> 
  1574                              <1> ;	THIS SEQUENCE ENSURES WHENEVER A DISKETTE IS CHANGED THAT
  1575                              <1> ;	ON THE NEXT OPERATION THE REQUIRED MOTOR START UP TIME WILL
  1576                              <1> ;	BE WAITED. (DRIVE MOTOR MAY GO OFF UPON DOOR OPENING).
  1577                              <1> 
  1578 00003AC3 6689F9              <1> 	MOV	CX,DI			; CL = DRIVE 0
  1579 00003AC6 B001                <1> 	MOV	AL,1			; MOTOR ON BIT MASK
  1580 00003AC8 D2E0                <1> 	SHL	AL,CL			; TO APPROPRIATE POSITION
  1581 00003ACA F6D0                <1> 	NOT	AL			; KEEP ALL BUT MOTOR ON
  1582 00003ACC FA                  <1> 	CLI				; NO INTERRUPTS
  1583 00003ACD 2005[66420100]      <1> 	AND	[MOTOR_STATUS], AL	; TURN MOTOR OFF INDICATOR
  1584 00003AD3 FB                  <1> 	STI				; INTERRUPTS ENABLED
  1585 00003AD4 E810040000          <1> 	CALL	MOTOR_ON		; TURN MOTOR ON
  1586                              <1> 
  1587                              <1> ;-----	THIS SEQUENCE OF SEEKS IS USED TO RESET DISKETTE CHANGE SIGNAL
  1588                              <1> 
  1589 00003AD9 E86DF9FFFF          <1> 	CALL	DSK_RESET		; RESET NEC
  1590 00003ADE B501                <1> 	MOV	CH,01H			; MOVE TO CYLINDER 1
  1591 00003AE0 E8FF040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1592 00003AE5 30ED                <1> 	XOR	CH,CH			; MOVE TO CYLINDER 0
  1593 00003AE7 E8F8040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1594 00003AEC C605[68420100]06    <1> 	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; STORE IN STATUS
  1595                              <1> OK1:
  1596 00003AF3 E84A060000          <1> 	CALL	READ_DSKCHNG		; CHECK MEDIA CHANGED AGAIN
  1597 00003AF8 7407                <1> 	JZ	short OK2		; IF ACTIVE, NO DISKETTE, TIMEOUT
  1598                              <1> OK4:
  1599 00003AFA C605[68420100]80    <1> 	MOV	byte [DSKETTE_STATUS], TIME_OUT ; TIMEOUT IF DRIVE EMPTY
  1600                              <1> OK2:		
  1601 00003B01 F9                  <1> 	STC				; MEDIA CHANGED, SET CY
  1602 00003B02 C3                  <1> 	RETn
  1603                              <1> MC_OUT:
  1604 00003B03 F8                  <1> 	CLC				; NO MEDIA CHANGED, CLEAR CY
  1605 00003B04 C3                  <1> 	RETn
  1606                              <1> 
  1607                              <1> ;-------------------------------------------------------------------------------
  1608                              <1> ; SEND_RATE
  1609                              <1> ;	SENDS DATA RATE COMMAND TO NEC
  1610                              <1> ; ON ENTRY:	DI = DRIVE #
  1611                              <1> ; ON EXIT:	NONE
  1612                              <1> ; REGISTERS ALTERED: DX
  1613                              <1> ;-------------------------------------------------------------------------------
  1614                              <1> SEND_RATE:
  1615 00003B05 6650                <1> 	PUSH	AX			; SAVE REG.
  1616 00003B07 8025[70420100]3F    <1> 	AND	byte [LASTRATE], ~SEND_MSK ; ELSE CLEAR LAST RATE ATTEMPTED
  1617 00003B0E 8A87[75420100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1618 00003B14 24C0                <1> 	AND	AL,SEND_MSK		; KEEP ONLY RATE BITS
  1619 00003B16 0805[70420100]      <1> 	OR	[LASTRATE], AL		; SAVE NEW RATE FOR NEXT CHECK
  1620 00003B1C C0C002              <1> 	ROL	AL,2			; MOVE TO BIT OUTPUT POSITIONS
  1621 00003B1F 66BAF703            <1> 	MOV	DX,03F7H		; OUTPUT NEW DATA RATE
  1622 00003B23 EE                  <1> 	OUT	DX,AL
  1623 00003B24 6658                <1> 	POP	AX			; RESTORE REG.
  1624 00003B26 C3                  <1> 	RETn
  1625                              <1> 
  1626                              <1> ;-------------------------------------------------------------------------------
  1627                              <1> ; CHK_LASTRATE
  1628                              <1> ;	CHECK PREVIOUS DATE RATE SNT TO THE CONTROLLER.
  1629                              <1> ; ON ENTRY:
  1630                              <1> ;	DI = DRIVE #
  1631                              <1> ; ON EXIT:
  1632                              <1> ;	ZF =  1 DATA RATE IS THE SAME AS THE LAST RATE SENT TO NEC
  1633                              <1> ;	ZF =  0 DATA RATE IS DIFFERENT FROM LAST RATE
  1634                              <1> ; REGISTERS ALTERED: DX
  1635                              <1> ;-------------------------------------------------------------------------------
  1636                              <1> CHK_LASTRATE:
  1637 00003B27 6650                <1> 	PUSH	AX			; SAVE REG
  1638 00003B29 2225[70420100]      <1> 	AND	AH, [LASTRATE]		; GET LAST DATA RATE SELECTED
  1639 00003B2F 8A87[75420100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1640 00003B35 6625C0C0            <1>         AND     AX, SEND_MSK*257        ; KEEP ONLY RATE BITS OF BOTH
  1641 00003B39 38E0                <1> 	CMP	AL, AH			; COMPARE TO PREVIOUSLY TRIED
  1642                              <1> 					; ZF = 1 RATE IS THE SAME
  1643 00003B3B 6658                <1> 	POP	AX			; RESTORE REG.
  1644 00003B3D C3                  <1> 	RETn
  1645                              <1> 
  1646                              <1> ;-------------------------------------------------------------------------------
  1647                              <1> ; DMA_SETUP
  1648                              <1> ;	THIS ROUTINE SETS UP THE DMA FOR READ/WRITE/VERIFY OPERATIONS.
  1649                              <1> ;
  1650                              <1> ; ON ENTRY:	AL = DMA COMMAND
  1651                              <1> ;
  1652                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1653                              <1> ;-------------------------------------------------------------------------------
  1654                              <1> 
  1655                              <1> ; SI = Head #, # of Sectors or DASD Type
  1656                              <1> 
  1657                              <1> ; 22/08/2015
  1658                              <1> ; 08/02/2015 - Protected Mode Modification
  1659                              <1> ; 06/02/2015 - 07/02/2015
  1660                              <1> ; NOTE: Buffer address must be in 1st 16MB of Physical Memory (24 bit limit).
  1661                              <1> ; (DMA Addres = Physical Address)
  1662                              <1> ; (Retro UNIX 386 v1 Kernel/System Mode Virtual Address = Physical Address)
  1663                              <1> ;
  1664                              <1> 
  1665                              <1> 
  1666                              <1> ; 04/02/2016 (clc)
  1667                              <1> ; 20/02/2015 modification (source: AWARD BIOS 1999, DMA_SETUP)
  1668                              <1> ; 16/12/2014 (IODELAY)
  1669                              <1> 
  1670                              <1> DMA_SETUP:
  1671                              <1> 
  1672                              <1> ;; 20/02/2015
  1673 00003B3E 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1674 00003B41 F7C2000000FF        <1> 	test	edx, 0FF000000h		; 16 MB limit (22/08/2015, bugfix)
  1675 00003B47 756E                <1> 	jnz	short dma_bnd_err_stc
  1676                              <1> 	;
  1677 00003B49 6650                <1> 	push	ax			; DMA command
  1678 00003B4B 52                  <1> 	push	edx			; *
  1679 00003B4C B203                <1> 	mov	dl, 3			; GET BYTES/SECTOR PARAMETER
  1680 00003B4E E851030000          <1> 	call	GET_PARM		; 
  1681 00003B53 88E1                <1> 	mov	cl, ah 			; SHIFT COUNT (0=128, 1=256, 2=512 ETC)
  1682 00003B55 6689F0              <1> 	mov	ax, si			; Sector count
  1683 00003B58 88C4                <1> 	mov	ah, al			; AH =  # OF SECTORS
  1684 00003B5A 28C0                <1> 	sub	al, al			; AL = 0, AX = # SECTORS * 256
  1685 00003B5C 66D1E8              <1> 	shr	ax, 1			; AX = # SECTORS * 128
  1686 00003B5F 66D3E0              <1> 	shl	ax, cl			; SHIFT BY PARAMETER VALUE
  1687 00003B62 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1688 00003B64 6689C1              <1> 	mov	cx, ax
  1689 00003B67 5A                  <1> 	pop	edx			; *
  1690 00003B68 6658                <1> 	pop	ax
  1691 00003B6A 3C42                <1> 	cmp	al, 42h
  1692 00003B6C 7507                <1>         jne     short NOT_VERF
  1693 00003B6E BA0000FF00          <1> 	mov	edx, 0FF0000h
  1694 00003B73 EB08                <1> 	jmp	short J33
  1695                              <1> NOT_VERF:
  1696 00003B75 6601CA              <1> 	add	dx, cx			; check for overflow
  1697 00003B78 723E                <1> 	jc	short dma_bnd_err
  1698                              <1> 	;
  1699 00003B7A 6629CA              <1> 	sub	dx, cx			; Restore start address
  1700                              <1> J33:
  1701 00003B7D FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1702 00003B7E E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1703                              <1> 	IODELAY				; WAIT FOR I/O
  1703 00003B80 EB00                <2>  jmp short $+2
  1703 00003B82 EB00                <2>  jmp short $+2
  1704 00003B84 E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1705 00003B86 89D0                <1> 	mov	eax, edx		; Buffer address
  1706 00003B88 E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1707                              <1> 	IODELAY				; WAIT FOR I/O
  1707 00003B8A EB00                <2>  jmp short $+2
  1707 00003B8C EB00                <2>  jmp short $+2
  1708 00003B8E 88E0                <1> 	MOV	AL,AH
  1709 00003B90 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1710 00003B92 C1E810              <1> 	shr	eax, 16
  1711                              <1> 	IODELAY				; I/O WAIT STATE
  1711 00003B95 EB00                <2>  jmp short $+2
  1711 00003B97 EB00                <2>  jmp short $+2
  1712 00003B99 E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1713                              <1> 	IODELAY
  1713 00003B9B EB00                <2>  jmp short $+2
  1713 00003B9D EB00                <2>  jmp short $+2
  1714 00003B9F 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1715 00003BA2 E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1716                              <1> 	IODELAY				; WAIT FOR I/O
  1716 00003BA4 EB00                <2>  jmp short $+2
  1716 00003BA6 EB00                <2>  jmp short $+2
  1717 00003BA8 88E0                <1> 	MOV	AL, AH
  1718 00003BAA E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1719                              <1> 	IODELAY
  1719 00003BAC EB00                <2>  jmp short $+2
  1719 00003BAE EB00                <2>  jmp short $+2
  1720 00003BB0 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1721 00003BB1 B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1722 00003BB3 E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1723                              <1> 
  1724 00003BB5 F8                  <1> 	clc	; 04/02/2016
  1725 00003BB6 C3                  <1> 	retn
  1726                              <1> 
  1727                              <1> dma_bnd_err_stc:
  1728 00003BB7 F9                  <1> 	stc
  1729                              <1> dma_bnd_err:
  1730 00003BB8 C605[68420100]09    <1> 	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1731 00003BBF C3                  <1> 	RETn				; CY SET BY ABOVE IF ERROR
  1732                              <1> 
  1733                              <1> ;; 16/12/2014
  1734                              <1> ;;	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1735                              <1> ;;	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1736                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1737                              <1> ;;	IODELAY
  1738                              <1> ;; 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1739                              <1> ;;	;SIODELAY
  1740                              <1> ;;      ;CMP	AL, 42H			; DMA VERIFY COMMAND
  1741                              <1> ;;      ;JNE	short NOT_VERF		; NO
  1742                              <1> ;;      ;XOR	AX, AX			; START ADDRESS
  1743                              <1> ;;      ;JMP	SHORT J33
  1744                              <1> ;;;NOT_VERF:	
  1745                              <1> ;;	;MOV	AX,ES			; GET THE ES VALUE
  1746                              <1> ;;	;ROL	AX,4			; ROTATE LEFT
  1747                              <1> ;;	;MOV	CH,AL			; GET HIGHEST NIBBLE OF ES TO CH
  1748                              <1> ;;	;AND	AL,11110000B		; ZERO THE LOW NIBBLE FROM SEGMENT
  1749                              <1> ;;	;ADD	AX,[BP+2]		; TEST FOR CARRY FROM ADDITION
  1750                              <1> ;;	mov	eax, [ebp+4] ; 06/02/2015	
  1751                              <1> ;;	;JNC	short J33
  1752                              <1> ;;	;INC	CH			; CARRY MEANS HIGH 4 BITS MUST BE INC
  1753                              <1> ;;;J33:
  1754                              <1> ;;	PUSH	eAX			; SAVE START ADDRESS
  1755                              <1> ;;	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1756                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1757                              <1> ;;	IODELAY
  1758                              <1> ;;	MOV	AL,AH
  1759                              <1> ;;	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1760                              <1> ;;	shr	eax, 16	     ; 07/02/2015
  1761                              <1> ;;	;MOV	AL,CH			; GET HIGH 4 BITS
  1762                              <1> ;;	;JMP	$+2			; I/O WAIT STATE
  1763                              <1> ;;	IODELAY
  1764                              <1> ;;	;AND	AL,00001111B
  1765                              <1> ;;	OUT	081H,AL			; OUTPUT HIGH 4 BITS TO PAGE REGISTER
  1766                              <1> ;;	;SIODELAY
  1767                              <1> ;;
  1768                              <1> ;;;----- DETERMINE COUNT
  1769                              <1> ;;	sub	eax, eax ; 08/02/2015
  1770                              <1> ;;	MOV	AX, SI			; AL =  # OF SECTORS
  1771                              <1> ;;	XCHG	AL, AH			; AH =  # OF SECTORS
  1772                              <1> ;;	SUB	AL, AL			; AL = 0, AX = # SECTORS * 256
  1773                              <1> ;;	SHR	AX, 1			; AX = # SECTORS * 128
  1774                              <1> ;;	PUSH	AX			; SAVE # OF SECTORS * 128
  1775                              <1> ;;	MOV	DL, 3			; GET BYTES/SECTOR PARAMETER
  1776                              <1> ;;	CALL	GET_PARM		; "
  1777                              <1> ;;	MOV	CL,AH			; SHIFT COUNT (0=128, 1=256, 2=512 ETC)
  1778                              <1> ;;	POP	AX			; AX = # SECTORS * 128
  1779                              <1> ;;	SHL	AX,CL			; SHIFT BY PARAMETER VALUE
  1780                              <1> ;;	DEC	AX			; -1 FOR DMA VALUE
  1781                              <1> ;;	PUSH	eAX  ; 08/02/2015	; SAVE COUNT VALUE
  1782                              <1> ;;	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1783                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1784                              <1> ;;	IODELAY
  1785                              <1> ;;	MOV	AL, AH
  1786                              <1> ;;	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1787                              <1> ;;	;IODELAY
  1788                              <1> ;;	STI				; RE-ENABLE INTERRUPTS
  1789                              <1> ;;	POP	eCX  ; 08/02/2015 	; RECOVER COUNT VALUE
  1790                              <1> ;;	POP	eAX  ; 08/02/2015	; RECOVER ADDRESS VALUE
  1791                              <1> ;;	;ADD	AX, CX			; ADD, TEST FOR 64K OVERFLOW
  1792                              <1> ;;	add	ecx, eax ; 08/02/2015
  1793                              <1> ;;	MOV	AL, 2			; MODE FOR 8237
  1794                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1795                              <1> ;;	SIODELAY
  1796                              <1> ;;	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1797                              <1> ;;	;JNC	short NO_BAD		; CHECK FOR ERROR
  1798                              <1> ;;	jc	short dma_bnd_err ; 08/02/2015
  1799                              <1> ;;	and	ecx, 0FFF00000h ; 16 MB limit
  1800                              <1> ;;	jz	short NO_BAD
  1801                              <1> ;;dma_bnd_err:
  1802                              <1> ;;	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1803                              <1> ;;NO_BAD:
  1804                              <1> ;;	RETn				; CY SET BY ABOVE IF ERROR
  1805                              <1> 
  1806                              <1> ;-------------------------------------------------------------------------------
  1807                              <1> ; FMTDMA_SET
  1808                              <1> ;	THIS ROUTINE SETS UP THE DMA CONTROLLER FOR A FORMAT OPERATION.
  1809                              <1> ;
  1810                              <1> ; ON ENTRY:	NOTHING REQUIRED
  1811                              <1> ;
  1812                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1813                              <1> ;-------------------------------------------------------------------------------
  1814                              <1> 
  1815                              <1> FMTDMA_SET:
  1816                              <1> ;; 20/02/2015 modification	
  1817 00003BC0 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1818 00003BC3 F7C20000F0FF        <1> 	test	edx, 0FFF00000h		; 16 MB limit
  1819 00003BC9 75EC                <1> 	jnz	short dma_bnd_err_stc
  1820                              <1> 	;
  1821 00003BCB 6652                <1> 	push	dx			; *
  1822 00003BCD B204                <1> 	mov	DL, 4			; SECTORS/TRACK VALUE IN PARM TABLE
  1823 00003BCF E8D0020000          <1> 	call	GET_PARM		; "
  1824 00003BD4 88E0                <1> 	mov	al, ah			; AL = SECTORS/TRACK VALUE
  1825 00003BD6 28E4                <1> 	sub	ah, ah			; AX = SECTORS/TRACK VALUE
  1826 00003BD8 66C1E002            <1> 	shl	ax, 2			; AX = SEC/TRK * 4 (OFFSET C,H,R,N)
  1827 00003BDC 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1828 00003BDE 6689C1              <1> 	mov	cx, ax
  1829 00003BE1 665A                <1> 	pop	dx			; *
  1830 00003BE3 6601CA              <1> 	add	dx, cx			; check for overflow
  1831 00003BE6 72D0                <1> 	jc	short dma_bnd_err
  1832                              <1> 	;
  1833 00003BE8 6629CA              <1> 	sub	dx, cx			; Restore start address
  1834                              <1> 	;
  1835 00003BEB B04A                <1> 	MOV	AL, 04AH		; WILL WRITE TO THE DISKETTE
  1836 00003BED FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1837 00003BEE E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1838                              <1> 	IODELAY				; WAIT FOR I/O
  1838 00003BF0 EB00                <2>  jmp short $+2
  1838 00003BF2 EB00                <2>  jmp short $+2
  1839 00003BF4 E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1840 00003BF6 89D0                <1> 	mov	eax, edx		; Buffer address
  1841 00003BF8 E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1842                              <1> 	IODELAY				; WAIT FOR I/O
  1842 00003BFA EB00                <2>  jmp short $+2
  1842 00003BFC EB00                <2>  jmp short $+2
  1843 00003BFE 88E0                <1> 	MOV	AL,AH
  1844 00003C00 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1845 00003C02 C1E810              <1> 	shr	eax, 16
  1846                              <1> 	IODELAY				; I/O WAIT STATE
  1846 00003C05 EB00                <2>  jmp short $+2
  1846 00003C07 EB00                <2>  jmp short $+2
  1847 00003C09 E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1848                              <1> 	IODELAY
  1848 00003C0B EB00                <2>  jmp short $+2
  1848 00003C0D EB00                <2>  jmp short $+2
  1849 00003C0F 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1850 00003C12 E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1851                              <1> 	IODELAY				; WAIT FOR I/O
  1851 00003C14 EB00                <2>  jmp short $+2
  1851 00003C16 EB00                <2>  jmp short $+2
  1852 00003C18 88E0                <1> 	MOV	AL, AH
  1853 00003C1A E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1854                              <1> 	IODELAY
  1854 00003C1C EB00                <2>  jmp short $+2
  1854 00003C1E EB00                <2>  jmp short $+2
  1855 00003C20 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1856 00003C21 B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1857 00003C23 E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1858 00003C25 C3                  <1> 	retn
  1859                              <1> 
  1860                              <1> ;; 08/02/2015 - Protected Mode Modification
  1861                              <1> ;;	MOV	AL, 04AH		; WILL WRITE TO THE DISKETTE
  1862                              <1> ;;	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1863                              <1> ;;	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1864                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1865                              <1> ;;	IODELAY
  1866                              <1> ;;	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1867                              <1> ;;	;MOV	AX,ES			; GET THE ES VALUE
  1868                              <1> ;;	;ROL	AX,4			; ROTATE LEFT
  1869                              <1> ;;	;MOV	CH,AL			; GET HIGHEST NIBBLE OF ES TO CH
  1870                              <1> ;;	;AND	AL,11110000B		; ZERO THE LOW NIBBLE FROM SEGMENT
  1871                              <1> ;;	;ADD	AX,[BP+2]		; TEST FOR CARRY FROM ADDITION
  1872                              <1> ;;	;JNC	short J33A
  1873                              <1> ;;	;INC	CH			; CARRY MEANS HIGH 4 BITS MUST BE INC
  1874                              <1> ;;	mov	eax, [ebp+4] ; 08/02/2015
  1875                              <1> ;;;J33A:
  1876                              <1> ;;	PUSH	eAX ; 08/02/2015	; SAVE START ADDRESS
  1877                              <1> ;;	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1878                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1879                              <1> ;;	IODELAY
  1880                              <1> ;;	MOV	AL,AH
  1881                              <1> ;;	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1882                              <1> ;;	shr 	eax, 16 ; 08/02/2015
  1883                              <1> ;;	;MOV	AL,CH			; GET HIGH 4 BITS
  1884                              <1> ;;	;JMP	$+2			; I/O WAIT STATE
  1885                              <1> ;;	IODELAY
  1886                              <1> ;;	;AND	AL,00001111B
  1887                              <1> ;;	OUT	081H,AL			; OUTPUT HIGH 4 BITS TO PAGE REGISTER
  1888                              <1> ;;
  1889                              <1> ;;;----- DETERMINE COUNT
  1890                              <1> ;;	sub	eax, eax ; 08/02/2015
  1891                              <1> ;;	MOV	DL, 4			; SECTORS/TRACK VALUE IN PARM TABLE
  1892                              <1> ;;	CALL	GET_PARM		; "
  1893                              <1> ;;	XCHG	AL, AH			; AL = SECTORS/TRACK VALUE
  1894                              <1> ;;	SUB	AH, AH			; AX = SECTORS/TRACK VALUE
  1895                              <1> ;;	SHL	AX, 2			; AX = SEC/TRK * 4 (OFFSET C,H,R,N)
  1896                              <1> ;;	DEC	AX			; -1 FOR DMA VALUE
  1897                              <1> ;;	PUSH	eAX 	; 08/02/2015	; SAVE # OF BYTES TO BE TRANSFERED
  1898                              <1> ;;	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1899                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1900                              <1> ;;	IODELAY
  1901                              <1> ;;	MOV	AL, AH
  1902                              <1> ;;	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1903                              <1> ;;	STI				; RE-ENABLE INTERRUPTS
  1904                              <1> ;;	POP	eCX	; 08/02/2015	; RECOVER COUNT VALUE
  1905                              <1> ;;	POP	eAX	; 08/02/2015	; RECOVER ADDRESS VALUE
  1906                              <1> ;;	;ADD	AX, CX			; ADD, TEST FOR 64K OVERFLOW
  1907                              <1> ;;	add	ecx, eax ; 08/02/2015
  1908                              <1> ;;	MOV	AL, 2			; MODE FOR 8237
  1909                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1910                              <1> ;;	SIODELAY
  1911                              <1> ;;	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1912                              <1> ;;	;JNC	short FMTDMA_OK		; CHECK FOR ERROR
  1913                              <1> ;;	jc	short fmtdma_bnd_err ; 08/02/2015
  1914                              <1> ;;	and	ecx, 0FFF00000h  ; 16 MB limit
  1915                              <1> ;;	jz	short FMTDMA_OK
  1916                              <1> ;;	stc	; 20/02/2015
  1917                              <1> ;;fmtdma_bnd_err:
  1918                              <1> ;;	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1919                              <1> ;;FMTDMA_OK:
  1920                              <1> ;;	RETn				; CY SET BY ABOVE IF ERROR
  1921                              <1> 
  1922                              <1> ;-------------------------------------------------------------------------------
  1923                              <1> ; NEC_INIT	
  1924                              <1> ;	THIS ROUTINE SEEKS TO THE REQUESTED TRACK AND INITIALIZES
  1925                              <1> ;	THE NEC FOR THE READ/WRITE/VERIFY/FORMAT OPERATION.
  1926                              <1> ;
  1927                              <1> ; ON ENTRY:	AH = NEC COMMAND TO BE PERFORMED
  1928                              <1> ;
  1929                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1930                              <1> ;-------------------------------------------------------------------------------
  1931                              <1> NEC_INIT:
  1932 00003C26 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1933 00003C28 E8BC020000          <1> 	CALL	MOTOR_ON		; TURN MOTOR ON FOR SPECIFIC DRIVE
  1934                              <1> 
  1935                              <1> ;-----	DO THE SEEK OPERATION
  1936                              <1> 
  1937 00003C2D 8A6D01              <1> 	MOV	CH,[eBP+1]		; CH = TRACK #
  1938 00003C30 E8AF030000          <1> 	CALL	SEEK			; MOVE TO CORRECT TRACK
  1939 00003C35 6658                <1> 	POP	AX			; RECOVER COMMAND
  1940 00003C37 721E                <1> 	JC	short ER_1		; ERROR ON SEEK
  1941 00003C39 BB[573C0000]        <1> 	MOV	eBX, ER_1		; LOAD ERROR ADDRESS
  1942 00003C3E 53                  <1> 	PUSH	eBX			; PUSH NEC_OUT ERROR RETURN
  1943                              <1> 
  1944                              <1> ;-----	SEND OUT THE PARAMETERS TO THE CONTROLLER
  1945                              <1> 
  1946 00003C3F E866030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE OPERATION COMMAND
  1947 00003C44 6689F0              <1> 	MOV	AX,SI			; AH = HEAD #
  1948 00003C47 89FB                <1> 	MOV	eBX,eDI			; BL = DRIVE #
  1949 00003C49 C0E402              <1> 	SAL	AH,2			; MOVE IT TO BIT 2
  1950 00003C4C 80E404              <1> 	AND	AH,00000100B		; ISOLATE THAT BIT
  1951 00003C4F 08DC                <1> 	OR	AH,BL			; OR IN THE DRIVE NUMBER
  1952 00003C51 E854030000          <1> 	CALL	NEC_OUTPUT		; FALL THRU CY SET IF ERROR
  1953 00003C56 5B                  <1> 	POP	eBX			; THROW AWAY ERROR RETURN
  1954                              <1> ER_1:
  1955 00003C57 C3                  <1> 	RETn
  1956                              <1> 
  1957                              <1> ;-------------------------------------------------------------------------------
  1958                              <1> ; RWV_COM
  1959                              <1> ;	THIS ROUTINE SENDS PARAMETERS TO THE NEC SPECIFIC TO THE 
  1960                              <1> ;	READ/WRITE/VERIFY OPERATIONS.
  1961                              <1> ;
  1962                              <1> ; ON ENTRY:	CS:BX = ADDRESS OF MEDIA/DRIVE PARAMETER TABLE
  1963                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1964                              <1> ;-------------------------------------------------------------------------------
  1965                              <1> RWV_COM:
  1966 00003C58 B8[A33C0000]        <1> 	MOV	eAX, ER_2		; LOAD ERROR ADDRESS
  1967 00003C5D 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1968 00003C5E 8A6501              <1> 	MOV	AH,[eBP+1]		; OUTPUT TRACK #
  1969 00003C61 E844030000          <1> 	CALL	NEC_OUTPUT
  1970 00003C66 6689F0              <1> 	MOV	AX,SI			; OUTPUT HEAD #
  1971 00003C69 E83C030000          <1> 	CALL	NEC_OUTPUT
  1972 00003C6E 8A6500              <1>         MOV     AH,[eBP]                ; OUTPUT SECTOR #
  1973 00003C71 E834030000          <1> 	CALL	NEC_OUTPUT
  1974 00003C76 B203                <1> 	MOV	DL,3			; BYTES/SECTOR PARAMETER FROM BLOCK
  1975 00003C78 E827020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  1976 00003C7D E828030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  1977 00003C82 B204                <1> 	MOV	DL,4			; EOT PARAMETER FROM BLOCK
  1978 00003C84 E81B020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  1979 00003C89 E81C030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  1980 00003C8E 8A6305              <1>         MOV     AH, [eBX+MD.GAP]        ; GET GAP LENGTH
  1981                              <1> _R15:
  1982 00003C91 E814030000          <1> 	CALL	NEC_OUTPUT
  1983 00003C96 B206                <1> 	MOV	DL,6			; DTL PARAMETER PROM BLOCK
  1984 00003C98 E807020000          <1> 	CALL	GET_PARM		;  TO THE NEC
  1985 00003C9D E808030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  1986 00003CA2 58                  <1> 	POP	eAX			; THROW AWAY ERROR EXIT
  1987                              <1> ER_2:
  1988 00003CA3 C3                  <1> 	RETn
  1989                              <1> 
  1990                              <1> ;-------------------------------------------------------------------------------
  1991                              <1> ; NEC_TERM
  1992                              <1> ;	THIS ROUTINE WAITS FOR THE OPERATION THEN ACCEPTS THE STATUS 
  1993                              <1> ;	FROM THE NEC FOR THE READ/WRITE/VERIFY/FORWAT OPERATION.
  1994                              <1> ;
  1995                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1996                              <1> ;-------------------------------------------------------------------------------
  1997                              <1> NEC_TERM:
  1998                              <1> 
  1999                              <1> ;-----	LET THE OPERATION HAPPEN
  2000                              <1> 
  2001 00003CA4 56                  <1> 	PUSH	eSI			; SAVE HEAD #, # OF SECTORS
  2002 00003CA5 E80D040000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2003 00003CAA 9C                  <1> 	PUSHF
  2004 00003CAB E837040000          <1> 	CALL	RESULTS			; GET THE NEC STATUS
  2005 00003CB0 724B                <1> 	JC	short SET_END_POP
  2006 00003CB2 9D                  <1> 	POPF
  2007 00003CB3 723E                <1> 	JC	short SET_END		; LOOK FOR ERROR
  2008                              <1> 
  2009                              <1> ;-----	CHECK THE RESULTS RETURNED BY THE CONTROLLER
  2010                              <1> 
  2011 00003CB5 FC                  <1> 	CLD				; SET THE CORRECT DIRECTION
  2012 00003CB6 BE[69420100]        <1> 	MOV	eSI, NEC_STATUS		; POINT TO STATUS FIELD
  2013 00003CBB AC                  <1> 	lodsb				; GET ST0
  2014 00003CBC 24C0                <1> 	AND	AL,11000000B		; TEST FOR NORMAL TERMINATION
  2015 00003CBE 7433                <1> 	JZ	short SET_END
  2016 00003CC0 3C40                <1> 	CMP	AL,01000000B		; TEST FOR ABNORMAL TERMINATION
  2017 00003CC2 7527                <1> 	JNZ	short J18		; NOT ABNORMAL, BAD NEC
  2018                              <1> 
  2019                              <1> ;-----	ABNORMAL TERMINATION, FIND OUT WHY
  2020                              <1> 
  2021 00003CC4 AC                  <1> 	lodsb				; GET ST1
  2022 00003CC5 D0E0                <1> 	SAL	AL,1			; TEST FOR EDT FOUND
  2023 00003CC7 B404                <1> 	MOV	AH,RECORD_NOT_FND
  2024 00003CC9 7222                <1> 	JC	short J19
  2025 00003CCB C0E002              <1> 	SAL	AL,2
  2026 00003CCE B410                <1> 	MOV	AH,BAD_CRC
  2027 00003CD0 721B                <1> 	JC	short J19
  2028 00003CD2 D0E0                <1> 	SAL	AL,1			; TEST FOR DMA OVERRUN
  2029 00003CD4 B408                <1> 	MOV	AH,BAD_DMA
  2030 00003CD6 7215                <1> 	JC	short J19
  2031 00003CD8 C0E002              <1> 	SAL	AL,2			; TEST FOR RECORD NOT FOUND
  2032 00003CDB B404                <1> 	MOV	AH,RECORD_NOT_FND
  2033 00003CDD 720E                <1> 	JC	short J19
  2034 00003CDF D0E0                <1> 	SAL	AL,1
  2035 00003CE1 B403                <1> 	MOV	AH,WRITE_PROTECT	; TEST FOR WRITE_PROTECT
  2036 00003CE3 7208                <1> 	JC	short J19
  2037 00003CE5 D0E0                <1> 	SAL	AL,1			; TEST MISSING ADDRESS MARK
  2038 00003CE7 B402                <1> 	MOV	AH,BAD_ADDR_MARK
  2039 00003CE9 7202                <1> 	JC	short J19
  2040                              <1> 
  2041                              <1> ;----- 	NEC MUST HAVE FAILED
  2042                              <1> J18:
  2043 00003CEB B420                <1> 	MOV	AH,BAD_NEC
  2044                              <1> J19:
  2045 00003CED 0825[68420100]      <1> 	OR	[DSKETTE_STATUS], AH
  2046                              <1> SET_END:
  2047 00003CF3 803D[68420100]01    <1> 	CMP	byte [DSKETTE_STATUS], 1 ; SET ERROR CONDITION
  2048 00003CFA F5                  <1> 	CMC
  2049 00003CFB 5E                  <1> 	POP	eSI
  2050 00003CFC C3                  <1> 	RETn				; RESTORE HEAD #, # OF SECTORS
  2051                              <1> 
  2052                              <1> SET_END_POP:
  2053 00003CFD 9D                  <1> 	POPF
  2054 00003CFE EBF3                <1> 	JMP	SHORT SET_END
  2055                              <1> 
  2056                              <1> ;-------------------------------------------------------------------------------
  2057                              <1> ; DSTATE:	ESTABLISH STATE UPON SUCCESSFUL OPERATION.
  2058                              <1> ;-------------------------------------------------------------------------------
  2059                              <1> DSTATE:
  2060 00003D00 803D[68420100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2061 00003D07 753E                <1> 	JNZ	short SETBAC		    ; IF ERROR JUMP
  2062 00003D09 808F[75420100]10    <1> 	OR	byte [DSK_STATE+eDI],MED_DET ; NO ERROR, MARK MEDIA AS DETERMINED
  2063 00003D10 F687[75420100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE DETERMINED ?
  2064 00003D17 752E                <1> 	JNZ	short SETBAC		; IF DETERMINED NO TRY TO DETERMINE
  2065 00003D19 8A87[75420100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2066 00003D1F 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2067 00003D21 3C80                <1> 	CMP	AL,RATE_250		; RATE 250 ?
  2068 00003D23 751B                <1> 	JNE	short M_12		; NO, MUST BE 1.2M OR 1.44M DRIVE
  2069                              <1> 
  2070                              <1> ;----- 	CHECK IF IT IS 1.44M
  2071                              <1> 
  2072 00003D25 E871010000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  2073                              <1> 	;;20/02/2015
  2074                              <1> 	;;JC	short M_12		; CMOS BAD
  2075 00003D2A 7414                <1> 	jz	short M_12 ;; 20/02/2015
  2076 00003D2C 3C04                <1> 	CMP	AL, 4			; 1.44MB DRIVE ?
  2077 00003D2E 7410                <1> 	JE	short M_12		; YES
  2078                              <1> M_720:
  2079 00003D30 80A7[75420100]FD    <1> 	AND	byte [DSK_STATE+eDI], ~FMT_CAPA ; TURN OFF FORMAT CAPABILITY
  2080 00003D37 808F[75420100]04    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET  ; MARK DRIVE DETERMINED
  2081 00003D3E EB07                <1> 	JMP	SHORT SETBAC		; BACK
  2082                              <1> M_12:	
  2083 00003D40 808F[75420100]06    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET+FMT_CAPA 
  2084                              <1> 					; TURN ON DETERMINED & FMT CAPA
  2085                              <1> SETBAC:
  2086 00003D47 C3                  <1> 	RETn
  2087                              <1> 
  2088                              <1> ;-------------------------------------------------------------------------------
  2089                              <1> ; RETRY	
  2090                              <1> ;	DETERMINES WHETHER A RETRY IS NECESSARY. 
  2091                              <1> ;	IF RETRY IS REQUIRED THEN STATE INFORMATION IS UPDATED FOR RETRY.
  2092                              <1> ;
  2093                              <1> ; ON EXIT:	CY = 1 FOR RETRY, CY = 0 FOR NO RETRY
  2094                              <1> ;-------------------------------------------------------------------------------
  2095                              <1> RETRY:
  2096 00003D48 803D[68420100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; GET STATUS OF OPERATION
  2097 00003D4F 7445                <1> 	JZ	short NO_RETRY		; SUCCESSFUL OPERATION
  2098 00003D51 803D[68420100]80    <1> 	CMP	byte [DSKETTE_STATUS],TIME_OUT ; IF TIME OUT NO RETRY
  2099 00003D58 743C                <1> 	JZ	short NO_RETRY
  2100 00003D5A 8AA7[75420100]      <1> 	MOV	AH,[DSK_STATE+eDI]	; GET MEDIA STATE OF DRIVE
  2101 00003D60 F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED/DETERMINED ?
  2102 00003D63 7531                <1> 	JNZ	short NO_RETRY		; IF ESTABLISHED STATE THEN TRUE ERROR
  2103 00003D65 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE RATE
  2104 00003D68 8A2D[70420100]      <1> 	MOV	CH,[LASTRATE]		; GET START OPERATION STATE
  2105 00003D6E C0C504              <1> 	ROL	CH,4			; TO CORRESPONDING BITS
  2106 00003D71 80E5C0              <1> 	AND	CH,RATE_MSK		; ISOLATE RATE BITS
  2107 00003D74 38E5                <1> 	CMP	CH,AH			; ALL RATES TRIED
  2108 00003D76 741E                <1> 	JE	short NO_RETRY		; IF YES, THEN TRUE ERROR
  2109                              <1> 
  2110                              <1> ;	SETUP STATE INDICATOR FOR RETRY ATTEMPT TO NEXT RATE
  2111                              <1> ;	 00000000B (500) -> 10000000B	(250)
  2112                              <1> ;	 10000000B (250) -> 01000000B	(300)
  2113                              <1> ;	 01000000B (300) -> 00000000B	(500)
  2114                              <1> 
  2115 00003D78 80FC01              <1> 	CMP	AH,RATE_500+1		; SET CY FOR RATE 500
  2116 00003D7B D0DC                <1> 	RCR	AH,1			; TO NEXT STATE
  2117 00003D7D 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE BITS
  2118 00003D80 80A7[75420100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP)
  2119                              <1> 					; RATE, DBL STEP OFF
  2120 00003D87 08A7[75420100]      <1> 	OR	[DSK_STATE+eDI],AH	; TURN ON NEW RATE
  2121 00003D8D C605[68420100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; RESET STATUS FOR RETRY
  2122 00003D94 F9                  <1> 	STC				; SET CARRY FOR RETRY
  2123 00003D95 C3                  <1> 	RETn				; RETRY RETURN
  2124                              <1> 
  2125                              <1> NO_RETRY:
  2126 00003D96 F8                  <1> 	CLC				; CLEAR CARRY NO RETRY
  2127 00003D97 C3                  <1> 	RETn				; NO RETRY RETURN
  2128                              <1> 
  2129                              <1> ;-------------------------------------------------------------------------------
  2130                              <1> ; NUM_TRANS
  2131                              <1> ;	THIS ROUTINE CALCULATES THE NUMBER OF SECTORS THAT WERE
  2132                              <1> ;	ACTUALLY TRANSFERRED TO/FROM THE DISKETTE.
  2133                              <1> ;
  2134                              <1> ; ON ENTRY:	[BP+1] = TRACK
  2135                              <1> ;		SI-HI  = HEAD
  2136                              <1> ;		[BP]   = START SECTOR
  2137                              <1> ;
  2138                              <1> ; ON EXIT:	AL = NUMBER ACTUALLY TRANSFERRED
  2139                              <1> ;-------------------------------------------------------------------------------
  2140                              <1> NUM_TRANS:
  2141 00003D98 30C0                <1> 	XOR	AL,AL			; CLEAR FOR ERROR
  2142 00003D9A 803D[68420100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2143 00003DA1 752C                <1> 	JNZ	NT_OUT			; IF ERROR 0 TRANSFERRED
  2144 00003DA3 B204                <1> 	MOV	DL,4			; SECTORS/TRACK OFFSET TO DL
  2145 00003DA5 E8FA000000          <1> 	CALL	GET_PARM		; AH = SECTORS/TRACK
  2146 00003DAA 8A1D[6E420100]      <1> 	MOV	BL, [NEC_STATUS+5]	; GET ENDING SECTOR
  2147 00003DB0 6689F1              <1> 	MOV	CX,SI			; CH = HEAD # STARTED
  2148 00003DB3 3A2D[6D420100]      <1> 	CMP	CH, [NEC_STATUS+4]	; GET HEAD ENDED UP ON
  2149 00003DB9 750D                <1> 	JNZ	DIF_HD			; IF ON SAME HEAD, THEN NO ADJUST
  2150 00003DBB 8A2D[6C420100]      <1> 	MOV	CH, [NEC_STATUS+3]	; GET TRACK ENDED UP ON
  2151 00003DC1 3A6D01              <1> 	CMP	CH,[eBP+1]		; IS IT ASKED FOR TRACK
  2152 00003DC4 7404                <1> 	JZ	short SAME_TRK		; IF SAME TRACK NO INCREASE
  2153 00003DC6 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2154                              <1> DIF_HD:
  2155 00003DC8 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2156                              <1> SAME_TRK:
  2157 00003DCA 2A5D00              <1> 	SUB	BL,[eBP]		; SUBTRACT START FROM END
  2158 00003DCD 88D8                <1> 	MOV	AL,BL			; TO AL
  2159                              <1> NT_OUT:
  2160 00003DCF C3                  <1> 	RETn
  2161                              <1> 
  2162                              <1> ;-------------------------------------------------------------------------------
  2163                              <1> ; SETUP_END
  2164                              <1> ;	RESTORES @MOTOR_COUNT TO PARAMETER PROVIDED IN TABLE 
  2165                              <1> ;	AND LOADS @DSKETTE_STATUS TO AH, AND SETS CY.
  2166                              <1> ;
  2167                              <1> ; ON EXIT:
  2168                              <1> ;	AH, @DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2169                              <1> ;-------------------------------------------------------------------------------
  2170                              <1> SETUP_END:
  2171 00003DD0 B202                <1> 	MOV	DL,2			; GET THE MOTOR WAIT PARAMETER
  2172 00003DD2 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  2173 00003DD4 E8CB000000          <1> 	CALL	GET_PARM
  2174 00003DD9 8825[67420100]      <1> 	MOV	[MOTOR_COUNT],AH	; STORE UPON RETURN
  2175 00003DDF 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  2176 00003DE1 8A25[68420100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; GET STATUS OF OPERATION
  2177 00003DE7 08E4                <1> 	OR	AH,AH			; CHECK FOR ERROR
  2178 00003DE9 7402                <1> 	JZ	short NUN_ERR		; NO ERROR
  2179 00003DEB 30C0                <1> 	XOR	AL,AL			; CLEAR NUMBER RETURNED
  2180                              <1> NUN_ERR: 
  2181 00003DED 80FC01              <1> 	CMP	AH,1			; SET THE CARRY FLAG TO INDICATE
  2182 00003DF0 F5                  <1> 	CMC				; SUCCESS OR FAILURE
  2183 00003DF1 C3                  <1> 	RETn
  2184                              <1> 
  2185                              <1> ;-------------------------------------------------------------------------------
  2186                              <1> ; SETUP_DBL
  2187                              <1> ;	CHECK DOUBLE STEP.
  2188                              <1> ;
  2189                              <1> ; ON ENTRY :	DI = DRIVE
  2190                              <1> ;
  2191                              <1> ; ON EXIT :	CY = 1 MEANS ERROR
  2192                              <1> ;-------------------------------------------------------------------------------
  2193                              <1> SETUP_DBL:
  2194 00003DF2 8AA7[75420100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  2195 00003DF8 F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED STATE ?
  2196 00003DFB 757E                <1> 	JNZ	short NO_DBL			; IF ESTABLISHED THEN DOUBLE DONE
  2197                              <1> 
  2198                              <1> ;-----	CHECK FOR TRACK 0 TO SPEED UP ACKNOWLEDGE OF UNFORMATTED DISKETTE
  2199                              <1> 
  2200 00003DFD C605[65420100]00    <1> 	MOV	byte [SEEK_STATUS],0	; SET RECALIBRATE REQUIRED ON ALL DRIVES
  2201 00003E04 E8E0000000          <1> 	CALL	MOTOR_ON		; ENSURE MOTOR STAY ON
  2202 00003E09 B500                <1> 	MOV	CH,0			; LOAD TRACK 0
  2203 00003E0B E8D4010000          <1> 	CALL	SEEK			; SEEK TO TRACK 0
  2204 00003E10 E868000000          <1> 	CALL	READ_ID			; READ ID FUNCTION
  2205 00003E15 7249                <1> 	JC	short SD_ERR		; IF ERROR NO TRACK 0
  2206                              <1> 
  2207                              <1> ;-----	INITIALIZE START AND MAX TRACKS (TIMES 2 FOR BOTH HEADS)
  2208                              <1> 
  2209 00003E17 66B95004            <1> 	MOV	CX,0450H 		; START, MAX TRACKS
  2210 00003E1B F687[75420100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; TEST FOR 80 TRACK CAPABILITY
  2211 00003E22 7402                <1> 	JZ	short CNT_OK		; IF NOT COUNT IS SETUP
  2212 00003E24 B1A0                <1> 	MOV	CL,0A0H			; MAXIMUM TRACK 1.2 MB
  2213                              <1> 
  2214                              <1> ;	ATTEMPT READ ID OF ALL TRACKS, ALL HEADS UNTIL SUCCESS; UPON SUCCESS,
  2215                              <1> ;	MUST SEE IF ASKED FOR TRACK IN SINGLE STEP MODE = TRACK ID READ; IF NOT
  2216                              <1> ;	THEN SET DOUBLE STEP ON.
  2217                              <1> 
  2218                              <1> CNT_OK:
  2219 00003E26 C605[67420100]FF    <1>         MOV     byte [MOTOR_COUNT], 0FFH ; ENSURE MOTOR STAYS ON FOR OPERATION 
  2220 00003E2D 6651                <1> 	PUSH	CX			; SAVE TRACK, COUNT
  2221 00003E2F C605[68420100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR STATUS, EXPECT ERRORS
  2222 00003E36 6631C0              <1> 	XOR	AX,AX			; CLEAR AX
  2223 00003E39 D0ED                <1> 	SHR	CH,1			; HALVE TRACK, CY = HEAD
  2224 00003E3B C0D003              <1> 	RCL	AL,3			; AX = HEAD IN CORRECT BIT
  2225 00003E3E 6650                <1> 	PUSH	AX			; SAVE HEAD
  2226 00003E40 E89F010000          <1> 	CALL	SEEK			; SEEK TO TRACK
  2227 00003E45 6658                <1> 	POP	AX			; RESTORE HEAD
  2228 00003E47 6609C7              <1> 	OR	DI,AX			; DI = HEAD OR'ED DRIVE
  2229 00003E4A E82E000000          <1> 	CALL	READ_ID			; READ ID HEAD 0
  2230 00003E4F 9C                  <1> 	PUSHF				; SAVE RETURN FROM READ_ID
  2231 00003E50 6681E7FB00          <1> 	AND	DI,11111011B		; TURN OFF HEAD 1 BIT
  2232 00003E55 9D                  <1> 	POPF				; RESTORE ERROR RETURN
  2233 00003E56 6659                <1> 	POP	CX			; RESTORE COUNT
  2234 00003E58 7308                <1> 	JNC	short DO_CHK		; IF OK, ASKED = RETURNED TRACK ?
  2235 00003E5A FEC5                <1> 	INC	CH			; INC FOR NEXT TRACK
  2236 00003E5C 38CD                <1> 	CMP	CH,CL			; REACHED MAXIMUM YET
  2237 00003E5E 75C6                <1> 	JNZ	short CNT_OK		; CONTINUE TILL ALL TRIED
  2238                              <1> 
  2239                              <1> ;-----	FALL THRU, READ ID FAILED FOR ALL TRACKS
  2240                              <1> 
  2241                              <1> SD_ERR:	
  2242 00003E60 F9                  <1> 	STC				; SET CARRY FOR ERROR
  2243 00003E61 C3                  <1> 	RETn				; SETUP_DBL ERROR EXIT
  2244                              <1> 
  2245                              <1> DO_CHK:
  2246 00003E62 8A0D[6C420100]      <1> 	MOV	CL, [NEC_STATUS+3]	; LOAD RETURNED TRACK
  2247 00003E68 888F[79420100]      <1> 	MOV	[DSK_TRK+eDI], CL	; STORE TRACK NUMBER
  2248 00003E6E D0ED                <1> 	SHR	CH,1			; HALVE TRACK
  2249 00003E70 38CD                <1> 	CMP	CH,CL			; IS IT THE SAME AS ASKED FOR TRACK
  2250 00003E72 7407                <1> 	JZ	short NO_DBL		; IF SAME THEN NO DOUBLE STEP
  2251 00003E74 808F[75420100]20    <1> 	OR	byte [DSK_STATE+eDI],DBL_STEP ; TURN ON DOUBLE STEP REQUIRED
  2252                              <1> NO_DBL:
  2253 00003E7B F8                  <1> 	CLC				; CLEAR ERROR FLAG
  2254 00003E7C C3                  <1> 	RETn
  2255                              <1> 
  2256                              <1> ;-------------------------------------------------------------------------------
  2257                              <1> ; READ_ID
  2258                              <1> ;	READ ID FUNCTION.
  2259                              <1> ;
  2260                              <1> ; ON ENTRY:	DI : BIT 2 = HEAD; BITS 1,0 = DRIVE
  2261                              <1> ;
  2262                              <1> ; ON EXIT: 	DI : BIT 2 IS RESET, BITS 1,0 = DRIVE
  2263                              <1> ;		@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2264                              <1> ;-------------------------------------------------------------------------------
  2265                              <1> READ_ID:
  2266 00003E7D B8[9A3E0000]        <1> 	MOV	eAX, ER_3		; MOVE NEC OUTPUT ERROR ADDRESS
  2267 00003E82 50                  <1> 	PUSH	eAX
  2268 00003E83 B44A                <1> 	MOV	AH,4AH			; READ ID COMMAND
  2269 00003E85 E820010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2270 00003E8A 6689F8              <1> 	MOV	AX,DI			; DRIVE # TO AH, HEAD 0
  2271 00003E8D 88C4                <1> 	MOV	AH,AL
  2272 00003E8F E816010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2273 00003E94 E80BFEFFFF          <1> 	CALL	NEC_TERM		; WAIT FOR OPERATION, GET STATUS
  2274 00003E99 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  2275                              <1> ER_3:
  2276 00003E9A C3                  <1> 	RETn
  2277                              <1> 
  2278                              <1> ;-------------------------------------------------------------------------------
  2279                              <1> ; CMOS_TYPE
  2280                              <1> ;	RETURNS DISKETTE TYPE FROM CMOS
  2281                              <1> ;
  2282                              <1> ; ON ENTRY:	DI = DRIVE #
  2283                              <1> ;
  2284                              <1> ; ON EXIT:	AL = TYPE; CY REFLECTS STATUS
  2285                              <1> ;-------------------------------------------------------------------------------
  2286                              <1> 
  2287                              <1> CMOS_TYPE: ; 11/12/2014
  2288 00003E9B 8A87[565C0000]      <1> mov	al, [eDI+fd0_type]
  2289 00003EA1 20C0                <1> and 	al, al ; 18/12/2014
  2290 00003EA3 C3                  <1> retn
  2291                              <1> 
  2292                              <1> ;CMOS_TYPE:
  2293                              <1> ;	MOV	AL, CMOS_DIAG		; CMOS DIAGNOSTIC STATUS BYTE ADDRESS
  2294                              <1> ;	CALL	CMOS_READ		; GET CMOS STATUS
  2295                              <1> ;	TEST	AL,BAD_BAT+BAD_CKSUM	; BATTERY GOOD AND CHECKSUM VALID
  2296                              <1> ;	STC				; SET CY = 1 INDICATING ERROR FOR RETURN
  2297                              <1> ;	JNZ	short BAD_CM		; ERROR IF EITHER BIT ON
  2298                              <1> ;	MOV	AL,CMOS_DISKETTE	; ADDRESS OF DISKETTE BYTE IN CMOS
  2299                              <1> ;	CALL	CMOS_READ		; GET DISKETTE BYTE
  2300                              <1> ;	OR	DI,DI			; SEE WHICH DRIVE IN QUESTION
  2301                              <1> ;	JNZ	short TB		; IF DRIVE 1, DATA IN LOW NIBBLE
  2302                              <1> ;	ROR	AL,4			; EXCHANGE NIBBLES IF SECOND DRIVE
  2303                              <1> ;TB:
  2304                              <1> ;	AND	AL,0FH			; KEEP ONLY DRIVE DATA, RESET CY, 0
  2305                              <1> ;BAD_CM:
  2306                              <1> ;	RETn				; CY, STATUS OF READ
  2307                              <1> 
  2308                              <1> ;-------------------------------------------------------------------------------
  2309                              <1> ; GET_PARM
  2310                              <1> ;	THIS ROUTINE FETCHES THE INDEXED POINTER FROM THE DISK_BASE
  2311                              <1> ;	BLOCK POINTED TO BY THE DATA VARIABLE @DISK_POINTER. A BYTE FROM
  2312                              <1> ;	THAT TABLE IS THEN MOVED INTO AH, THE INDEX OF THAT BYTE BEING
  2313                              <1> ;	THE PARAMETER IN DL.
  2314                              <1> ;
  2315                              <1> ; ON ENTRY:	DL = INDEX OF BYTE TO BE FETCHED
  2316                              <1> ;
  2317                              <1> ; ON EXIT:	AH = THAT BYTE FROM BLOCK
  2318                              <1> ;		AL,DH DESTROYED
  2319                              <1> ;-------------------------------------------------------------------------------
  2320                              <1> GET_PARM:
  2321                              <1> 	;PUSH	DS
  2322 00003EA4 56                  <1> 	PUSH	eSI
  2323                              <1>     	;SUB	AX,AX			; DS = 0, BIOS DATA AREA
  2324                              <1>     	;MOV	DS,AX
  2325                              <1> 	;;mov	ax, cs
  2326                              <1> 	;;mov	ds, ax
  2327                              <1> 	; 08/02/2015 (protected mode modifications, bx -> ebx)
  2328 00003EA5 87D3                <1> 	XCHG	eDX,eBX			; BL = INDEX
  2329                              <1> 	;SUB	BH,BH			; BX = INDEX
  2330 00003EA7 81E3FF000000        <1> 	and	ebx, 0FFh
  2331                              <1>     	;LDS	SI, [DISK_POINTER]	; POINT TO BLOCK
  2332                              <1> 	;
  2333                              <1> 	; 17/12/2014
  2334 00003EAD 66A1[455C0000]      <1> 	mov	ax, [cfd] ; current (AL) and previous fd (AH)
  2335 00003EB3 38E0                <1> 	cmp	al, ah
  2336 00003EB5 7425                <1> 	je	short gpndc
  2337 00003EB7 A2[465C0000]        <1> 	mov	[pfd], al ; current drive -> previous drive
  2338 00003EBC 53                  <1> 	push	ebx ; 08/02/2015
  2339 00003EBD 88C3                <1> 	mov	bl, al 
  2340                              <1> 	; 11/12/2014
  2341 00003EBF 8A83[565C0000]      <1> 	mov	al, [eBX+fd0_type]	; Drive type (0,1,2,3,4)
  2342                              <1> 	; 18/12/2014
  2343 00003EC5 20C0                <1> 	and	al, al
  2344 00003EC7 7507                <1> 	jnz	short gpdtc
  2345 00003EC9 BB[2F5C0000]        <1> 	mov	ebx, MD_TBL6		; 1.44 MB param. tbl. (default)
  2346 00003ECE EB05                <1>         jmp     short gpdpu
  2347                              <1> gpdtc:	
  2348 00003ED0 E817F9FFFF          <1> 	call	DR_TYPE_CHECK
  2349                              <1> 	; cf = 1 -> eBX points to 1.44MB fd parameter table (default)
  2350                              <1> gpdpu:
  2351 00003ED5 891D[CC5B0000]      <1> 	mov	[DISK_POINTER], ebx
  2352 00003EDB 5B                  <1> 	pop	ebx
  2353                              <1> gpndc:
  2354 00003EDC 8B35[CC5B0000]      <1> 	mov	esi, [DISK_POINTER] ; 08/02/2015, si -> esi
  2355 00003EE2 8A241E              <1> 	MOV	AH, [eSI+eBX]		; GET THE WORD
  2356 00003EE5 87D3                <1> 	XCHG	eDX,eBX			; RESTORE BX
  2357 00003EE7 5E                  <1> 	POP	eSI
  2358                              <1> 	;POP	DS
  2359 00003EE8 C3                  <1> 	RETn
  2360                              <1> 
  2361                              <1> ;-------------------------------------------------------------------------------
  2362                              <1> ; MOTOR_ON
  2363                              <1> ;	TURN MOTOR ON AND WAIT FOR MOTOR START UP TIME. THE @MOTOR_COUNT
  2364                              <1> ;	IS REPLACED WITH A SUFFICIENTLY HIGH NUMBER (0FFH) TO ENSURE
  2365                              <1> ;	THAT THE MOTOR DOES NOT GO OFF DURING THE OPERATION. IF THE
  2366                              <1> ;	MOTOR NEEDED TO BE TURNED ON, THE MULTI-TASKING HOOK FUNCTION
  2367                              <1> ;	(AX=90FDH, INT 15) IS CALLED TELLING THE OPERATING SYSTEM
  2368                              <1> ;	THAT THE BIOS IS ABOUT TO WAIT FOR MOTOR START UP. IF THIS
  2369                              <1> ;	FUNCTION RETURNS WITH CY = 1, IT MEANS THAT THE MINIMUM WAIT
  2370                              <1> ;	HAS BEEN COMPLETED. AT THIS POINT A CHECK IS MADE TO ENSURE
  2371                              <1> ;	THAT THE MOTOR WASN'T TURNED OFF BY THE TIMER. IF THE HOOK DID
  2372                              <1> ;	NOT WAIT, THE WAIT FUNCTION (AH=086H) IS CALLED TO WAIT THE
  2373                              <1> ;	PRESCRIBED AMOUNT OF TIME. IF THE CARRY FLAG IS SET ON RETURN,
  2374                              <1> ;	IT MEANS THAT THE FUNCTION IS IN USE AND DID NOT PERFORM THE
  2375                              <1> ;	WAIT. A TIMER 1 WAIT LOOP WILL THEN DO THE WAIT.
  2376                              <1> ;
  2377                              <1> ; ON ENTRY:	DI = DRIVE #
  2378                              <1> ; ON EXIT:	AX,CX,DX DESTROYED
  2379                              <1> ;-------------------------------------------------------------------------------
  2380                              <1> MOTOR_ON:
  2381 00003EE9 53                  <1> 	PUSH	eBX			; SAVE REG.
  2382 00003EEA E82A000000          <1> 	CALL	TURN_ON			; TURN ON MOTOR
  2383 00003EEF 7226                <1> 	JC	short MOT_IS_ON		; IF CY=1 NO WAIT
  2384 00003EF1 E89BF9FFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  2385 00003EF6 E865F9FFFF          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH,
  2386                              <1> 	;CALL	TURN_ON 		; CHECK AGAIN IF MOTOR ON
  2387                              <1> 	;JC	MOT_IS_ON		; IF NO WAIT MEANS IT IS ON
  2388                              <1> M_WAIT:
  2389 00003EFB B20A                <1> 	MOV	DL,10			; GET THE MOTOR WAIT PARAMETER
  2390 00003EFD E8A2FFFFFF          <1> 	CALL	GET_PARM
  2391                              <1> 	;MOV	AL,AH			; AL = MOTOR WAIT PARAMETER
  2392                              <1> 	;XOR	AH,AH			; AX = MOTOR WAIT PARAMETER
  2393                              <1> 	;CMP	AL,8			; SEE IF AT LEAST A SECOND IS SPECIFIED
  2394 00003F02 80FC08              <1> 	cmp	ah, 8
  2395                              <1> 	;JAE	short GP2		; IF YES, CONTINUE
  2396 00003F05 7702                <1> 	ja	short J13
  2397                              <1> 	;MOV	AL,8			; ONE SECOND WAIT FOR MOTOR START UP
  2398 00003F07 B408                <1> 	mov	ah, 8
  2399                              <1> 
  2400                              <1> ;-----	AS CONTAINS NUMBER OF 1/8 SECONDS (125000 MICROSECONDS) TO WAIT
  2401                              <1> GP2:	
  2402                              <1> ;----- 	FOLLOWING LOOPS REQUIRED WHEN RTC WAIT FUNCTION IS ALREADY IN USE
  2403                              <1> J13:					; WAIT FOR 1/8 SECOND PER (AL)
  2404 00003F09 B95E200000          <1> 	MOV	eCX,8286		; COUNT FOR 1/8 SECOND AT 15.085737 US
  2405 00003F0E E8DADEFFFF          <1> 	CALL	WAITF			; GO TO FIXED WAIT ROUTINE
  2406                              <1> 	;DEC	AL			; DECREMENT TIME VALUE
  2407 00003F13 FECC                <1> 	dec	ah
  2408 00003F15 75F2                <1> 	JNZ	short J13		; ARE WE DONE YET
  2409                              <1> MOT_IS_ON:
  2410 00003F17 5B                  <1> 	POP	eBX			; RESTORE REG.
  2411 00003F18 C3                  <1> 	RETn
  2412                              <1> 
  2413                              <1> ;-------------------------------------------------------------------------------
  2414                              <1> ; TURN_ON
  2415                              <1> ;	TURN MOTOR ON AND RETURN WAIT STATE.
  2416                              <1> ;
  2417                              <1> ; ON ENTRY:	DI = DRIVE #
  2418                              <1> ;
  2419                              <1> ; ON EXIT:	CY = 0 MEANS WAIT REQUIRED
  2420                              <1> ;		CY = 1 MEANS NO WAIT REQUIRED
  2421                              <1> ;		AX,BX,CX,DX DESTROYED
  2422                              <1> ;-------------------------------------------------------------------------------
  2423                              <1> TURN_ON:
  2424 00003F19 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2425 00003F1B 88D9                <1> 	MOV	CL,BL			; CL = DRIVE #
  2426 00003F1D C0C304              <1> 	ROL	BL,4			; BL = DRIVE SELECT
  2427 00003F20 FA                  <1> 	CLI				; NO INTERRUPTS WHILE DETERMINING STATUS
  2428 00003F21 C605[67420100]FF    <1> 	MOV	byte [MOTOR_COUNT],0FFH	; ENSURE MOTOR STAYS ON FOR OPERATION
  2429 00003F28 A0[66420100]        <1> 	MOV	AL, [MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2430 00003F2D 2430                <1> 	AND	AL,00110000B		; KEEP ONLY DRIVE SELECT BITS
  2431 00003F2F B401                <1> 	MOV	AH,1			; MASK FOR DETERMINING MOTOR BIT
  2432 00003F31 D2E4                <1> 	SHL	AH,CL			; AH = MOTOR ON, A=00000001, B=00000010
  2433                              <1> 
  2434                              <1> ;  AL = DRIVE SELECT FROM @MOTOR_STATUS
  2435                              <1> ;  BL = DRIVE SELECT DESIRED
  2436                              <1> ;  AH = MOTOR ON MASK DESIRED
  2437                              <1> 
  2438 00003F33 38D8                <1> 	CMP	AL,BL			; REQUESTED DRIVE ALREADY SELECTED ?
  2439 00003F35 7508                <1> 	JNZ	short TURN_IT_ON	; IF NOT SELECTED JUMP
  2440 00003F37 8425[66420100]      <1> 	TEST	AH, [MOTOR_STATUS]	; TEST MOTOR ON BIT
  2441 00003F3D 7535                <1> 	JNZ	short NO_MOT_WAIT	; JUMP IF MOTOR ON AND SELECTED
  2442                              <1> 
  2443                              <1> TURN_IT_ON:
  2444 00003F3F 08DC                <1> 	OR	AH,BL			; AH = DRIVE SELECT AND MOTOR ON
  2445 00003F41 8A3D[66420100]      <1> 	MOV	BH,[MOTOR_STATUS]	; SAVE COPY OF @MOTOR_STATUS BEFORE
  2446 00003F47 80E70F              <1> 	AND	BH,00001111B		; KEEP ONLY MOTOR BITS
  2447 00003F4A 8025[66420100]CF    <1> 	AND	byte [MOTOR_STATUS],11001111B ; CLEAR OUT DRIVE SELECT
  2448 00003F51 0825[66420100]      <1> 	OR	[MOTOR_STATUS],AH	; OR IN DRIVE SELECTED AND MOTOR ON
  2449 00003F57 A0[66420100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2450 00003F5C 88C3                <1> 	MOV	BL,AL			; BL=@MOTOR_STATUS AFTER, BH=BEFORE
  2451 00003F5E 80E30F              <1> 	AND	BL,00001111B		; KEEP ONLY MOTOR BITS
  2452 00003F61 FB                  <1> 	STI				; ENABLE INTERRUPTS AGAIN
  2453 00003F62 243F                <1> 	AND	AL,00111111B		; STRIP AWAY UNWANTED BITS
  2454 00003F64 C0C004              <1> 	ROL	AL,4			; PUT BITS IN DESIRED POSITIONS
  2455 00003F67 0C0C                <1> 	OR	AL,00001100B		; NO RESET, ENABLE DMA/INTERRUPT
  2456 00003F69 66BAF203            <1> 	MOV	DX,03F2H		; SELECT DRIVE AND TURN ON MOTOR
  2457 00003F6D EE                  <1> 	OUT	DX,AL
  2458 00003F6E 38FB                <1> 	CMP	BL,BH			; NEW MOTOR TURNED ON ?
  2459                              <1> 	;JZ	short NO_MOT_WAIT	; NO WAIT REQUIRED IF JUST SELECT
  2460 00003F70 7403                <1> 	je	short no_mot_w1 ; 27/02/2015 
  2461 00003F72 F8                  <1> 	CLC				; (re)SET CARRY MEANING WAIT
  2462 00003F73 C3                  <1> 	RETn
  2463                              <1> 
  2464                              <1> NO_MOT_WAIT:
  2465 00003F74 FB                  <1> 	sti
  2466                              <1> no_mot_w1: ; 27/02/2015
  2467 00003F75 F9                  <1> 	STC				; SET NO WAIT REQUIRED
  2468                              <1> 	;STI				; INTERRUPTS BACK ON
  2469 00003F76 C3                  <1> 	RETn
  2470                              <1> 
  2471                              <1> ;-------------------------------------------------------------------------------
  2472                              <1> ; HD_WAIT
  2473                              <1> ;	WAIT FOR HEAD SETTLE TIME.
  2474                              <1> ;
  2475                              <1> ; ON ENTRY:	DI = DRIVE #
  2476                              <1> ;
  2477                              <1> ; ON EXIT:	AX,BX,CX,DX DESTROYED
  2478                              <1> ;-------------------------------------------------------------------------------
  2479                              <1> HD_WAIT:
  2480 00003F77 B209                <1> 	MOV	DL,9			; GET HEAD SETTLE PARAMETER
  2481 00003F79 E826FFFFFF          <1> 	CALL	GET_PARM
  2482 00003F7E 08E4                <1> 	or	ah, ah	; 17/12/2014
  2483 00003F80 7519                <1> 	jnz	short DO_WAT
  2484 00003F82 F605[66420100]80    <1>         TEST    byte [MOTOR_STATUS],10000000B ; SEE IF A WRITE OPERATION
  2485                              <1> 	;JZ	short ISNT_WRITE	; IF NOT, DO NOT ENFORCE ANY VALUES
  2486                              <1> 	;OR	AH,AH			; CHECK FOR ANY WAIT?
  2487                              <1> 	;JNZ	short DO_WAT		; IF THERE DO NOT ENFORCE
  2488 00003F89 741E                <1> 	jz	short HW_DONE
  2489 00003F8B B40F                <1> 	MOV	AH,HD12_SETTLE		; LOAD 1.2M HEAD SETTLE MINIMUM
  2490 00003F8D 8A87[75420100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2491 00003F93 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2492 00003F95 3C80                <1> 	CMP	AL,RATE_250		; 1.2 M DRIVE ?
  2493 00003F97 7502                <1> 	JNZ	short DO_WAT		; DEFAULT HEAD SETTLE LOADED
  2494                              <1> ;GP3:
  2495 00003F99 B414                <1> 	MOV	AH,HD320_SETTLE		; USE 320/360 HEAD SETTLE
  2496                              <1> ;	JMP	SHORT DO_WAT
  2497                              <1> 
  2498                              <1> ;ISNT_WRITE:
  2499                              <1> ;	OR	AH,AH			; CHECK FOR NO WAIT
  2500                              <1> ;	JZ	short HW_DONE		; IF NOT WRITE AND 0 ITS OK
  2501                              <1> 
  2502                              <1> ;-----	AH CONTAINS NUMBER OF MILLISECONDS TO WAIT
  2503                              <1> DO_WAT:
  2504                              <1> ;	MOV	AL,AH			; AL = # MILLISECONDS
  2505                              <1> ;	;XOR	AH,AH			; AX = # MILLISECONDS
  2506                              <1> J29:					; 	1 MILLISECOND LOOP
  2507                              <1> 	;mov	cx, WAIT_FDU_HEAD_SETTLE ; 33 ; 1 ms in 30 micro units.
  2508 00003F9B B942000000          <1> 	MOV	eCX,66			; COUNT AT 15.085737 US PER COUNT
  2509 00003FA0 E848DEFFFF          <1> 	CALL	WAITF			; DELAY FOR 1 MILLISECOND
  2510                              <1> 	;DEC	AL			; DECREMENT THE COUNT
  2511 00003FA5 FECC                <1> 	dec	ah
  2512 00003FA7 75F2                <1> 	JNZ	short J29		; DO AL MILLISECOND # OF TIMES
  2513                              <1> HW_DONE:
  2514 00003FA9 C3                  <1> 	RETn
  2515                              <1> 
  2516                              <1> ;-------------------------------------------------------------------------------
  2517                              <1> ; NEC_OUTPUT
  2518                              <1> ;	THIS ROUTINE SENDS A BYTE TO THE NEC CONTROLLER AFTER TESTING
  2519                              <1> ;	FOR CORRECT DIRECTION AND CONTROLLER READY THIS ROUTINE WILL
  2520                              <1> ;	TIME OUT IF THE BYTE IS NOT ACCEPTED WITHIN A REASONABLE AMOUNT
  2521                              <1> ;	OF TIME, SETTING THE DISKETTE STATUS ON COMPLETION.
  2522                              <1> ; 
  2523                              <1> ; ON ENTRY: 	AH = BYTE TO BE OUTPUT
  2524                              <1> ;
  2525                              <1> ; ON EXIT:	CY = 0  SUCCESS
  2526                              <1> ;		CY = 1  FAILURE -- DISKETTE STATUS UPDATED
  2527                              <1> ;		        IF A FAILURE HAS OCCURRED, THE RETURN IS MADE ONE LEVEL
  2528                              <1> ;		        HIGHER THAN THE CALLER OF NEC OUTPUT. THIS REMOVES THE
  2529                              <1> ;		        REQUIREMENT OF TESTING AFTER EVERY CALL OF NEC_OUTPUT.
  2530                              <1> ;		AX,CX,DX DESTROYED
  2531                              <1> ;-------------------------------------------------------------------------------
  2532                              <1> 
  2533                              <1> ; 09/12/2014 [Erdogan Tan] 
  2534                              <1> ;	(from 'PS2 Hardware Interface Tech. Ref. May 88', Page 09-05.)
  2535                              <1> ; Diskette Drive Controller Status Register (3F4h)
  2536                              <1> ;	This read only register facilitates the transfer of data between
  2537                              <1> ;	the system microprocessor and the controller.
  2538                              <1> ; Bit 7 - When set to 1, the Data register is ready to transfer data 
  2539                              <1> ;	  with the system micrprocessor.
  2540                              <1> ; Bit 6 - The direction of data transfer. If this bit is set to 0,
  2541                              <1> ;	  the transfer is to the controller.
  2542                              <1> ; Bit 5 - When this bit is set to 1, the controller is in the non-DMA mode.
  2543                              <1> ; Bit 4 - When this bit is set to 1, a Read or Write command is being executed.
  2544                              <1> ; Bit 3 - Reserved.
  2545                              <1> ; Bit 2 - Reserved.
  2546                              <1> ; Bit 1 - When this bit is set to 1, dskette drive 1 is in the seek mode.
  2547                              <1> ; Bit 0 - When this bit is set to 1, dskette drive 1 is in the seek mode.
  2548                              <1> 
  2549                              <1> ; Data Register (3F5h)
  2550                              <1> ; This read/write register passes data, commands and parameters, and provides
  2551                              <1> ; diskette status information.
  2552                              <1>   		
  2553                              <1> NEC_OUTPUT:
  2554                              <1> 	;PUSH	BX			; SAVE REG.
  2555 00003FAA 66BAF403            <1> 	MOV	DX,03F4H		; STATUS PORT
  2556                              <1> 	;MOV	BL,2			; HIGH ORDER COUNTER
  2557                              <1> 	;XOR	CX,CX			; COUNT FOR TIME OUT
  2558                              <1> 	; 16/12/2014
  2559                              <1> 	; waiting for (max.) 0.5 seconds
  2560                              <1>         ;;mov     byte [wait_count], 0 ;; 27/02/2015
  2561                              <1> 	;
  2562                              <1> 	; 17/12/2014
  2563                              <1> 	; Modified from AWARD BIOS 1999 - ADISK.ASM - SEND_COMMAND
  2564                              <1> 	;
  2565                              <1> 	;WAIT_FOR_PORT:	Waits for a bit at a port pointed to by DX to
  2566                              <1> 	;		go on.
  2567                              <1> 	;INPUT:
  2568                              <1> 	;	AH=Mask for isolation bits.
  2569                              <1> 	;	AL=pattern to look for.
  2570                              <1> 	;	DX=Port to test for
  2571                              <1> 	;	BH:CX=Number of memory refresh periods to delay.
  2572                              <1> 	;	     (normally 30 microseconds per period.)
  2573                              <1> 	;
  2574                              <1> 	;WFP_SHORT:  
  2575                              <1> 	;	Wait for port if refresh cycle is short (15-80 Us range).
  2576                              <1> 	;
  2577                              <1> 
  2578                              <1> ;	mov	bl, WAIT_FDU_SEND_HI+1	; 0+1
  2579                              <1> ;	mov	cx, WAIT_FDU_SEND_LO	; 16667
  2580 00003FAE B91B410000          <1> 	mov	ecx, WAIT_FDU_SEND_LH   ; 16667 (27/02/2015)
  2581                              <1> ;
  2582                              <1> ;WFPS_OUTER_LP:
  2583                              <1> ;	;
  2584                              <1> ;WFPS_CHECK_PORT:
  2585                              <1> J23:
  2586 00003FB3 EC                  <1> 	IN	AL,DX			; GET STATUS
  2587 00003FB4 24C0                <1> 	AND	AL,11000000B		; KEEP STATUS AND DIRECTION
  2588 00003FB6 3C80                <1> 	CMP	AL,10000000B		; STATUS 1 AND DIRECTION 0 ?
  2589 00003FB8 7418                <1> 	JZ	short J27		; STATUS AND DIRECTION OK
  2590                              <1> WFPS_HI:
  2591 00003FBA E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2592 00003FBC A810                <1> 	TEST	AL,010H			; transition on memory
  2593 00003FBE 75FA                <1> 	JNZ	SHORT WFPS_HI		; refresh.
  2594                              <1> WFPS_LO:
  2595 00003FC0 E461                <1> 	IN	AL, PORT_B		; SYS1
  2596 00003FC2 A810                <1> 	TEST	AL,010H
  2597 00003FC4 74FA                <1> 	JZ	SHORT WFPS_LO
  2598                              <1> 	;LOOP	SHORT WFPS_CHECK_PORT
  2599 00003FC6 E2EB                <1> 	loop	J23	; 27/02/2015
  2600                              <1> ;	;
  2601                              <1> ;	dec	bl
  2602                              <1> ;	jnz	short WFPS_OUTER_LP
  2603                              <1> ;	jmp	short WFPS_TIMEOUT	; fail
  2604                              <1> ;J23:
  2605                              <1> ;	IN	AL,DX			; GET STATUS
  2606                              <1> ;	AND	AL,11000000B		; KEEP STATUS AND DIRECTION
  2607                              <1> ;	CMP	AL,10000000B		; STATUS 1 AND DIRECTION 0 ?
  2608                              <1> ;	JZ	short J27		; STATUS AND DIRECTION OK
  2609                              <1> 	;LOOP	J23			; CONTINUE TILL CX EXHAUSTED
  2610                              <1> 	;DEC	BL			; DECREMENT COUNTER
  2611                              <1> 	;JNZ	short J23		; REPEAT TILL DELAY FINISHED, CX = 0
  2612                              <1>    
  2613                              <1> 	;;27/02/2015
  2614                              <1> 	;16/12/2014
  2615                              <1>         ;;cmp     byte [wait_count], 10   ; (10/18.2 seconds)
  2616                              <1> 	;;jb	short J23
  2617                              <1> 
  2618                              <1> ;WFPS_TIMEOUT:
  2619                              <1> 
  2620                              <1> ;-----	FALL THRU TO ERROR RETURN
  2621                              <1> 
  2622 00003FC8 800D[68420100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2623                              <1> 	;POP	BX			; RESTORE REG.
  2624 00003FCF 58                  <1> 	POP	eAX ; 08/02/2015	; DISCARD THE RETURN ADDRESS
  2625 00003FD0 F9                  <1> 	STC				; INDICATE ERROR TO CALLER
  2626 00003FD1 C3                  <1> 	RETn
  2627                              <1> 
  2628                              <1> ;-----	DIRECTION AND STATUS OK; OUTPUT BYTE
  2629                              <1> 
  2630                              <1> J27:	
  2631 00003FD2 88E0                <1> 	MOV	AL,AH			; GET BYTE TO OUTPUT
  2632 00003FD4 6642                <1> 	INC	DX			; DATA PORT = STATUS PORT + 1
  2633 00003FD6 EE                  <1> 	OUT	DX,AL			; OUTPUT THE BYTE
  2634                              <1> 	;;NEWIODELAY  ;; 27/02/2015
  2635                              <1> 	; 27/02/2015
  2636 00003FD7 9C                  <1> 	PUSHF				; SAVE FLAGS
  2637 00003FD8 B903000000          <1> 	MOV	eCX, 3			; 30 TO 45 MICROSECONDS WAIT FOR
  2638 00003FDD E80BDEFFFF          <1> 	CALL 	WAITF			; NEC FLAGS UPDATE CYCLE
  2639 00003FE2 9D                  <1> 	POPF				; RESTORE FLAGS FOR EXIT
  2640                              <1> 	;POP	BX			; RESTORE REG
  2641 00003FE3 C3                  <1> 	RETn				; CY = 0 FROM TEST INSTRUCTION
  2642                              <1> 
  2643                              <1> ;-------------------------------------------------------------------------------
  2644                              <1> ; SEEK
  2645                              <1> ;	THIS ROUTINE WILL MOVE THE HEAD ON THE NAMED DRIVE TO THE NAMED
  2646                              <1> ;	TRACK. IF THE DRIVE HAS NOT BEEN ACCESSED SINCE THE DRIVE
  2647                              <1> ;	RESET COMMAND WAS ISSUED, THE DRIVE WILL BE RECALIBRATED.
  2648                              <1> ;
  2649                              <1> ; ON ENTRY:	DI = DRIVE #
  2650                              <1> ;		CH = TRACK #
  2651                              <1> ;
  2652                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2653                              <1> ;		AX,BX,CX DX DESTROYED
  2654                              <1> ;-------------------------------------------------------------------------------
  2655                              <1> SEEK:
  2656 00003FE4 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2657 00003FE6 B001                <1> 	MOV	AL,1			; ESTABLISH MASK FOR RECALIBRATE TEST
  2658 00003FE8 86CB                <1> 	XCHG	CL,BL			; SET DRIVE VALULE INTO CL
  2659 00003FEA D2C0                <1> 	ROL	AL,CL			; SHIFT MASK BY THE DRIVE VALUE
  2660 00003FEC 86CB                <1> 	XCHG	CL,BL			; RECOVER TRACK VALUE
  2661 00003FEE 8405[65420100]      <1> 	TEST	AL,[SEEK_STATUS]	; TEST FOR RECALIBRATE REQUIRED
  2662 00003FF4 7526                <1> 	JNZ	short J28A		; JUMP IF RECALIBRATE NOT REQUIRED
  2663                              <1> 
  2664 00003FF6 0805[65420100]      <1> 	OR	[SEEK_STATUS],AL	; TURN ON THE NO RECALIBRATE BIT IN FLAG
  2665 00003FFC E862000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2666 00004001 730E                <1> 	JNC	short AFT_RECAL		; RECALIBRATE DONE
  2667                              <1> 
  2668                              <1> ;-----	ISSUE RECALIBRATE FOR 80 TRACK DISKETTES
  2669                              <1> 
  2670 00004003 C605[68420100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR OUT INVALID STATUS
  2671 0000400A E854000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2672 0000400F 7251                <1> 	JC	short RB		; IF RECALIBRATE FAILS TWICE THEN ERROR
  2673                              <1> 
  2674                              <1> AFT_RECAL:
  2675 00004011 C687[79420100]00    <1>         MOV     byte [DSK_TRK+eDI],0    ; SAVE NEW CYLINDER AS PRESENT POSITION
  2676 00004018 08ED                <1> 	OR	CH,CH			; CHECK FOR SEEK TO TRACK 0
  2677 0000401A 743F                <1> 	JZ	short DO_WAIT		; HEAD SETTLE, CY = 0 IF JUMP
  2678                              <1> 
  2679                              <1> ;-----	DRIVE IS IN SYNCHRONIZATION WITH CONTROLLER, SEEK TO TRACK
  2680                              <1> 
  2681 0000401C F687[75420100]20    <1> J28A:	TEST	byte [DSK_STATE+eDI],DBL_STEP ; CHECK FOR DOUBLE STEP REQUIRED
  2682 00004023 7402                <1> 	JZ	short _R7		; SINGLE STEP REQUIRED BYPASS DOUBLE
  2683 00004025 D0E5                <1> 	SHL	CH,1			; DOUBLE NUMBER OF STEP TO TAKE
  2684                              <1> 
  2685 00004027 3AAF[79420100]      <1> _R7:	CMP	CH, [DSK_TRK+eDI]	; SEE IF ALREADY AT THE DESIRED TRACK
  2686 0000402D 7433                <1> 	JE	short RB		; IF YES, DO NOT NEED TO SEEK
  2687                              <1> 
  2688 0000402F BA[62400000]        <1> 	MOV	eDX, NEC_ERR		; LOAD RETURN ADDRESS
  2689 00004034 52                  <1> 	PUSH	eDX ; (*)		; ON STACK FOR NEC OUTPUT ERROR
  2690 00004035 88AF[79420100]      <1> 	MOV	[DSK_TRK+eDI],CH	; SAVE NEW CYLINDER AS PRESENT POSITION
  2691 0000403B B40F                <1> 	MOV	AH,0FH			; SEEK COMMAND TO NEC
  2692 0000403D E868FFFFFF          <1> 	CALL	NEC_OUTPUT
  2693 00004042 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2694 00004044 88DC                <1> 	MOV	AH,BL			; OUTPUT DRIVE NUMBER
  2695 00004046 E85FFFFFFF          <1> 	CALL	NEC_OUTPUT
  2696 0000404B 8AA7[79420100]      <1> 	MOV	AH, [DSK_TRK+eDI]	; GET CYLINDER NUMBER
  2697 00004051 E854FFFFFF          <1> 	CALL	NEC_OUTPUT
  2698 00004056 E829000000          <1> 	CALL	CHK_STAT_2		; ENDING INTERRUPT AND SENSE STATUS
  2699                              <1> 
  2700                              <1> ;-----	WAIT FOR HEAD SETTLE
  2701                              <1> 
  2702                              <1> DO_WAIT:
  2703 0000405B 9C                  <1> 	PUSHF				; SAVE STATUS
  2704 0000405C E816FFFFFF          <1> 	CALL	HD_WAIT			; WAIT FOR HEAD SETTLE TIME
  2705 00004061 9D                  <1> 	POPF				; RESTORE STATUS
  2706                              <1> RB:
  2707                              <1> NEC_ERR:
  2708                              <1> 	; 08/02/2015 (code trick here from original IBM PC/AT DISKETTE.ASM)
  2709                              <1> 	; (*) nec_err -> retn (push edx -> pop edx) -> nec_err -> retn
  2710 00004062 C3                  <1> 	RETn				; RETURN TO CALLER
  2711                              <1> 
  2712                              <1> ;-------------------------------------------------------------------------------
  2713                              <1> ; RECAL
  2714                              <1> ;	RECALIBRATE DRIVE
  2715                              <1> ;
  2716                              <1> ; ON ENTRY:	DI = DRIVE #
  2717                              <1> ;
  2718                              <1> ; ON EXIT:	CY REFLECTS STATUS OF OPERATION.
  2719                              <1> ;-------------------------------------------------------------------------------
  2720                              <1> RECAL:
  2721 00004063 6651                <1> 	PUSH	CX
  2722 00004065 B8[81400000]        <1> 	MOV	eAX, RC_BACK		; LOAD NEC_OUTPUT ERROR
  2723 0000406A 50                  <1> 	PUSH	eAX
  2724 0000406B B407                <1> 	MOV	AH,07H			; RECALIBRATE COMMAND
  2725 0000406D E838FFFFFF          <1> 	CALL	NEC_OUTPUT
  2726 00004072 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2727 00004074 88DC                <1> 	MOV	AH,BL
  2728 00004076 E82FFFFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE DRIVE NUMBER
  2729 0000407B E804000000          <1> 	CALL	CHK_STAT_2		; GET THE INTERRUPT AND SENSE INT STATUS
  2730 00004080 58                  <1> 	POP	eAX			; THROW AWAY ERROR
  2731                              <1> RC_BACK:
  2732 00004081 6659                <1> 	POP	CX
  2733 00004083 C3                  <1> 	RETn
  2734                              <1> 
  2735                              <1> ;-------------------------------------------------------------------------------
  2736                              <1> ; CHK_STAT_2
  2737                              <1> ;	THIS ROUTINE HANDLES THE INTERRUPT RECEIVED AFTER RECALIBRATE,
  2738                              <1> ;	OR SEEK TO THE ADAPTER. THE INTERRUPT IS WAITED FOR, THE
  2739                              <1> ;	INTERRUPT STATUS SENSED, AND THE RESULT RETURNED TO THE CALLER.
  2740                              <1> ;
  2741                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2742                              <1> ;-------------------------------------------------------------------------------
  2743                              <1> CHK_STAT_2:
  2744 00004084 B8[AC400000]        <1>         MOV     eAX, CS_BACK            ; LOAD NEC_OUTPUT ERROR ADDRESS
  2745 00004089 50                  <1> 	PUSH	eAX
  2746 0000408A E828000000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2747 0000408F 721A                <1> 	JC	short J34		; IF ERROR, RETURN IT
  2748 00004091 B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
  2749 00004093 E812FFFFFF          <1> 	CALL	NEC_OUTPUT
  2750 00004098 E84A000000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
  2751 0000409D 720C                <1> 	JC	short J34
  2752 0000409F A0[69420100]        <1> 	MOV	AL,[NEC_STATUS]		; GET THE FIRST STATUS BYTE
  2753 000040A4 2460                <1> 	AND	AL,01100000B		; ISOLATE THE BITS
  2754 000040A6 3C60                <1> 	CMP	AL,01100000B		; TEST FOR CORRECT VALUE
  2755 000040A8 7403                <1> 	JZ	short J35		; IF ERROR, GO MARK IT
  2756 000040AA F8                  <1> 	CLC				; GOOD RETURN
  2757                              <1> J34:
  2758 000040AB 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
  2759                              <1> CS_BACK:
  2760 000040AC C3                  <1> 	RETn
  2761                              <1> J35:
  2762 000040AD 800D[68420100]40    <1> 	OR	byte [DSKETTE_STATUS], BAD_SEEK
  2763 000040B4 F9                  <1> 	STC				; ERROR RETURN CODE
  2764 000040B5 EBF4                <1> 	JMP	SHORT J34
  2765                              <1> 
  2766                              <1> ;-------------------------------------------------------------------------------
  2767                              <1> ; WAIT_INT
  2768                              <1> ;	THIS ROUTINE WAITS FOR AN INTERRUPT TO OCCUR A TIME OUT ROUTINE
  2769                              <1> ;	TAKES PLACE DURING THE WAIT, SO THAT AN ERROR MAY BE RETURNED
  2770                              <1> ;	IF THE DRIVE IS NOT READY.
  2771                              <1> ;
  2772                              <1> ; ON EXIT: 	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2773                              <1> ;-------------------------------------------------------------------------------
  2774                              <1> 
  2775                              <1> ; 17/12/2014
  2776                              <1> ; 2.5 seconds waiting !
  2777                              <1> ;(AWARD BIOS - 1999, WAIT_FDU_INT_LOW, WAIT_FDU_INT_HI)
  2778                              <1> ; amount of time to wait for completion interrupt from NEC.
  2779                              <1> 
  2780                              <1> 
  2781                              <1> WAIT_INT:
  2782 000040B7 FB                  <1> 	STI				; TURN ON INTERRUPTS, JUST IN CASE
  2783 000040B8 F8                  <1> 	CLC				; CLEAR TIMEOUT INDICATOR
  2784                              <1>        ;MOV	BL,10			; CLEAR THE COUNTERS
  2785                              <1>        ;XOR	CX,CX			; FOR 2 SECOND WAIT
  2786                              <1> 
  2787                              <1> 	; Modification from AWARD BIOS - 1999 (ATORGS.ASM, WAIT
  2788                              <1> 	;
  2789                              <1> 	;WAIT_FOR_MEM:	
  2790                              <1> 	;	Waits for a bit at a specified memory location pointed
  2791                              <1> 	;	to by ES:[DI] to become set.
  2792                              <1> 	;INPUT:
  2793                              <1> 	;	AH=Mask to test with.
  2794                              <1> 	;	ES:[DI] = memory location to watch.
  2795                              <1> 	;	BH:CX=Number of memory refresh periods to delay.
  2796                              <1> 	;	     (normally 30 microseconds per period.)
  2797                              <1> 
  2798                              <1> 	; waiting for (max.) 2.5 secs in 30 micro units.
  2799                              <1> ;	mov 	cx, WAIT_FDU_INT_LO		; 017798
  2800                              <1> ;;	mov 	bl, WAIT_FDU_INT_HI
  2801                              <1> ;	mov 	bl, WAIT_FDU_INT_HI + 1
  2802                              <1> 	; 27/02/2015
  2803 000040B9 B986450100          <1> 	mov 	ecx, WAIT_FDU_INT_LH	; 83334 (2.5 seconds)		
  2804                              <1> WFMS_CHECK_MEM:
  2805 000040BE F605[65420100]80    <1> 	test	byte [SEEK_STATUS],INT_FLAG ; TEST FOR INTERRUPT OCCURRING
  2806 000040C5 7516                <1>         jnz     short J37
  2807                              <1> WFMS_HI:
  2808 000040C7 E461                <1> 	IN	AL,PORT_B  ; 061h	; SYS1, wait for lo to hi
  2809 000040C9 A810                <1> 	TEST	AL,010H			; transition on memory
  2810 000040CB 75FA                <1> 	JNZ	SHORT WFMS_HI		; refresh.
  2811                              <1> WFMS_LO:
  2812 000040CD E461                <1> 	IN	AL,PORT_B		;SYS1
  2813 000040CF A810                <1> 	TEST	AL,010H
  2814 000040D1 74FA                <1> 	JZ	SHORT WFMS_LO
  2815 000040D3 E2E9                <1>         LOOP    WFMS_CHECK_MEM
  2816                              <1> ;WFMS_OUTER_LP:
  2817                              <1> ;;	or	bl, bl			; check outer counter
  2818                              <1> ;;	jz	short J36A		; WFMS_TIMEOUT
  2819                              <1> ;	dec	bl
  2820                              <1> ;	jz	short J36A	
  2821                              <1> ;	jmp	short WFMS_CHECK_MEM
  2822                              <1> 
  2823                              <1> 	;17/12/2014
  2824                              <1> 	;16/12/2014
  2825                              <1> ;        mov     byte [wait_count], 0    ; Reset (INT 08H) counter
  2826                              <1> ;J36:
  2827                              <1> ;	TEST	byte [SEEK_STATUS],INT_FLAG ; TEST FOR INTERRUPT OCCURRING
  2828                              <1> ;	JNZ	short J37
  2829                              <1> 	;16/12/2014
  2830                              <1> 	;LOOP	J36			; COUNT DOWN WHILE WAITING
  2831                              <1> 	;DEC	BL			; SECOND LEVEL COUNTER
  2832                              <1> 	;JNZ	short J36
  2833                              <1> ;       cmp     byte [wait_count], 46   ; (46/18.2 seconds)
  2834                              <1> ;	jb	short J36
  2835                              <1> 
  2836                              <1> ;WFMS_TIMEOUT:
  2837                              <1> ;J36A:
  2838 000040D5 800D[68420100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; NOTHING HAPPENED
  2839 000040DC F9                  <1> 	STC				; ERROR RETURN
  2840                              <1> J37:
  2841 000040DD 9C                  <1> 	PUSHF				; SAVE CURRENT CARRY
  2842 000040DE 8025[65420100]7F    <1> 	AND	byte [SEEK_STATUS], ~INT_FLAG ; TURN OFF INTERRUPT FLAG
  2843 000040E5 9D                  <1> 	POPF				; RECOVER CARRY
  2844 000040E6 C3                  <1> 	RETn				; GOOD RETURN CODE
  2845                              <1> 
  2846                              <1> ;-------------------------------------------------------------------------------
  2847                              <1> ; RESULTS
  2848                              <1> ;	THIS ROUTINE WILL READ ANYTHING THAT THE NEC CONTROLLER RETURNS 
  2849                              <1> ;	FOLLOWING AN INTERRUPT.
  2850                              <1> ;
  2851                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2852                              <1> ;		AX,BX,CX,DX DESTROYED
  2853                              <1> ;-------------------------------------------------------------------------------
  2854                              <1> RESULTS:
  2855 000040E7 57                  <1> 	PUSH	eDI
  2856 000040E8 BF[69420100]        <1> 	MOV	eDI, NEC_STATUS		; POINTER TO DATA AREA
  2857 000040ED B307                <1> 	MOV	BL,7			; MAX STATUS BYTES
  2858 000040EF 66BAF403            <1> 	MOV	DX,03F4H		; STATUS PORT
  2859                              <1> 
  2860                              <1> ;-----	WAIT FOR REQUEST FOR MASTER
  2861                              <1> 
  2862                              <1> _R10: 
  2863                              <1> 	; 16/12/2014
  2864                              <1> 	; wait for (max) 0.5 seconds
  2865                              <1> 	;MOV	BH,2			; HIGH ORDER COUNTER
  2866                              <1> 	;XOR	CX,CX			; COUNTER
  2867                              <1> 
  2868                              <1> 	;Time to wait while waiting for each byte of NEC results = .5
  2869                              <1> 	;seconds.  .5 seconds = 500,000 micros.  500,000/30 = 16,667.
  2870                              <1> 	; 27/02/2015
  2871 000040F3 B91B410000          <1> 	mov 	ecx, WAIT_FDU_RESULTS_LH ; 16667  
  2872                              <1> 	;mov	cx, WAIT_FDU_RESULTS_LO  ; 16667
  2873                              <1> 	;mov	bh, WAIT_FDU_RESULTS_HI+1 ; 0+1
  2874                              <1> 
  2875                              <1> WFPSR_OUTER_LP:
  2876                              <1> 	;
  2877                              <1> WFPSR_CHECK_PORT:
  2878                              <1> J39:					; WAIT FOR MASTER
  2879 000040F8 EC                  <1> 	IN	AL,DX			; GET STATUS
  2880 000040F9 24C0                <1> 	AND	AL,11000000B		; KEEP ONLY STATUS AND DIRECTION
  2881 000040FB 3CC0                <1> 	CMP	AL,11000000B		; STATUS 1 AND DIRECTION 1 ?
  2882 000040FD 7418                <1> 	JZ	short J42		; STATUS AND DIRECTION OK
  2883                              <1> WFPSR_HI:
  2884 000040FF E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2885 00004101 A810                <1> 	TEST	AL,010H			; transition on memory
  2886 00004103 75FA                <1> 	JNZ	SHORT WFPSR_HI		; refresh.
  2887                              <1> WFPSR_LO:
  2888 00004105 E461                <1> 	IN	AL, PORT_B		; SYS1
  2889 00004107 A810                <1> 	TEST	AL,010H
  2890 00004109 74FA                <1> 	JZ	SHORT WFPSR_LO
  2891 0000410B E2EB                <1>         LOOP    WFPSR_CHECK_PORT
  2892                              <1> 	;; 27/02/2015
  2893                              <1> 	;;dec	bh
  2894                              <1> 	;;jnz	short WFPSR_OUTER_LP
  2895                              <1> 	;jmp	short WFPSR_TIMEOUT	; fail
  2896                              <1> 
  2897                              <1> 	;;mov	byte [wait_count], 0
  2898                              <1> ;J39:					; WAIT FOR MASTER
  2899                              <1> ;	IN	AL,DX			; GET STATUS
  2900                              <1> ;	AND	AL,11000000B		; KEEP ONLY STATUS AND DIRECTION
  2901                              <1> ;	CMP	AL,11000000B		; STATUS 1 AND DIRECTION 1 ?
  2902                              <1> ;	JZ	short J42		; STATUS AND DIRECTION OK
  2903                              <1> 	;LOOP	J39			; LOOP TILL TIMEOUT
  2904                              <1> 	;DEC	BH			; DECREMENT HIGH ORDER COUNTER
  2905                              <1> 	;JNZ	short J39		; REPEAT TILL DELAY DONE
  2906                              <1> 	;
  2907                              <1> 	;;cmp	byte [wait_count], 10  ; (10/18.2 seconds)
  2908                              <1> 	;;jb	short J39	
  2909                              <1> 
  2910                              <1> ;WFPSR_TIMEOUT:
  2911 0000410D 800D[68420100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2912 00004114 F9                  <1> 	STC				; SET ERROR RETURN
  2913 00004115 EB29                <1> 	JMP	SHORT POPRES		; POP REGISTERS AND RETURN
  2914                              <1> 
  2915                              <1> ;-----	READ IN THE STATUS
  2916                              <1> 
  2917                              <1> J42:
  2918 00004117 EB00                <1> 	JMP	$+2			; I/O DELAY
  2919 00004119 6642                <1> 	INC	DX			; POINT AT DATA PORT
  2920 0000411B EC                  <1> 	IN	AL,DX			; GET THE DATA
  2921                              <1> 	; 16/12/2014
  2922                              <1> 	NEWIODELAY
  2922 0000411C E6EB                <2>  out 0ebh,al
  2923 0000411E 8807                <1>         MOV     [eDI],AL                ; STORE THE BYTE
  2924 00004120 47                  <1> 	INC	eDI			; INCREMENT THE POINTER
  2925                              <1> 	; 16/12/2014
  2926                              <1> ;	push	cx
  2927                              <1> ;	mov	cx, 30
  2928                              <1> ;wdw2:
  2929                              <1> ;	NEWIODELAY
  2930                              <1> ;	loop	wdw2
  2931                              <1> ;	pop	cx
  2932                              <1> 
  2933 00004121 B903000000          <1> 	MOV	eCX,3			; MINIMUM 24 MICROSECONDS FOR NEC
  2934 00004126 E8C2DCFFFF          <1> 	CALL	WAITF			; WAIT 30 TO 45 MICROSECONDS
  2935 0000412B 664A                <1> 	DEC	DX			; POINT AT STATUS PORT
  2936 0000412D EC                  <1> 	IN	AL,DX			; GET STATUS
  2937                              <1> 	; 16/12/2014
  2938                              <1> 	NEWIODELAY
  2938 0000412E E6EB                <2>  out 0ebh,al
  2939                              <1> 	;
  2940 00004130 A810                <1> 	TEST	AL,00010000B		; TEST FOR NEC STILL BUSY
  2941 00004132 740C                <1> 	JZ	short POPRES		; RESULTS DONE ?
  2942                              <1> 
  2943 00004134 FECB                <1> 	DEC	BL			; DECREMENT THE STATUS COUNTER
  2944 00004136 75BB                <1>         JNZ     short _R10              ; GO BACK FOR MORE
  2945 00004138 800D[68420100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; TOO MANY STATUS BYTES
  2946 0000413F F9                  <1> 	STC				; SET ERROR FLAG
  2947                              <1> 
  2948                              <1> ;-----	RESULT OPERATION IS DONE
  2949                              <1> POPRES:
  2950 00004140 5F                  <1> 	POP	eDI
  2951 00004141 C3                  <1> 	RETn				; RETURN WITH CARRY SET
  2952                              <1> 
  2953                              <1> ;-------------------------------------------------------------------------------
  2954                              <1> ; READ_DSKCHNG
  2955                              <1> ;	READS THE STATE OF THE DISK CHANGE LINE.
  2956                              <1> ;
  2957                              <1> ; ON ENTRY:	DI = DRIVE #
  2958                              <1> ;
  2959                              <1> ; ON EXIT:	DI = DRIVE #
  2960                              <1> ;		ZF = 0 : DISK CHANGE LINE INACTIVE
  2961                              <1> ;		ZF = 1 : DISK CHANGE LINE ACTIVE
  2962                              <1> ;		AX,CX,DX DESTROYED
  2963                              <1> ;-------------------------------------------------------------------------------
  2964                              <1> READ_DSKCHNG:
  2965 00004142 E8A2FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON THE MOTOR IF OFF
  2966 00004147 66BAF703            <1> 	MOV	DX,03F7H		; ADDRESS DIGITAL INPUT REGISTER
  2967 0000414B EC                  <1> 	IN	AL,DX			; INPUT DIGITAL INPUT REGISTER
  2968 0000414C A880                <1> 	TEST	AL,DSK_CHG		; CHECK FOR DISK CHANGE LINE ACTIVE
  2969 0000414E C3                  <1> 	RETn				; RETURN TO CALLER WITH ZERO FLAG SET
  2970                              <1> 
  2971                              <1> ;-------------------------------------------------------------------------------
  2972                              <1> ; DRIVE_DET
  2973                              <1> ;	DETERMINES WHETHER DRIVE IS 80 OR 40 TRACKS AND
  2974                              <1> ;	UPDATES STATE INFORMATION ACCORDINGLY.
  2975                              <1> ; ON ENTRY:	DI = DRIVE #
  2976                              <1> ;-------------------------------------------------------------------------------
  2977                              <1> DRIVE_DET:
  2978 0000414F E895FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON MOTOR IF NOT ALREADY ON
  2979 00004154 E80AFFFFFF          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2980 00004159 7251                <1> 	JC	short DD_BAC		; ASSUME NO DRIVE PRESENT
  2981 0000415B B530                <1> 	MOV	CH,TRK_SLAP		; SEEK TO TRACK 48
  2982 0000415D E882FEFFFF          <1> 	CALL	SEEK
  2983 00004162 7248                <1> 	JC	short DD_BAC		; ERROR NO DRIVE
  2984 00004164 B50B                <1> 	MOV	CH,QUIET_SEEK+1		; SEEK TO TRACK 10
  2985                              <1> SK_GIN:
  2986 00004166 FECD                <1> 	DEC	CH			; DECREMENT TO NEXT TRACK
  2987 00004168 6651                <1> 	PUSH	CX			; SAVE TRACK
  2988 0000416A E875FEFFFF          <1> 	CALL	SEEK
  2989 0000416F 723C                <1> 	JC	short POP_BAC		; POP AND RETURN
  2990 00004171 B8[AD410000]        <1> 	MOV	eAX, POP_BAC		; LOAD NEC OUTPUT ERROR ADDRESS
  2991 00004176 50                  <1> 	PUSH	eAX
  2992 00004177 B404                <1> 	MOV	AH,SENSE_DRV_ST		; SENSE DRIVE STATUS COMMAND BYTE
  2993 00004179 E82CFEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  2994 0000417E 6689F8              <1> 	MOV	AX,DI			; AL = DRIVE
  2995 00004181 88C4                <1> 	MOV	AH,AL			; AH = DRIVE
  2996 00004183 E822FEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  2997 00004188 E85AFFFFFF          <1> 	CALL	RESULTS			; GO GET STATUS
  2998 0000418D 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  2999 0000418E 6659                <1> 	POP	CX			; RESTORE TRACK
  3000 00004190 F605[69420100]10    <1> 	TEST	byte [NEC_STATUS], HOME	; TRACK 0 ?
  3001 00004197 74CD                <1> 	JZ	short SK_GIN		; GO TILL TRACK 0
  3002 00004199 08ED                <1> 	OR	CH,CH			; IS HOME AT TRACK 0
  3003 0000419B 7408                <1> 	JZ	short IS_80		; MUST BE 80 TRACK DRIVE
  3004                              <1> 
  3005                              <1> ;	DRIVE IS A 360; SET DRIVE TO DETERMINED;
  3006                              <1> ;	SET MEDIA TO DETERMINED AT RATE 250.
  3007                              <1> 
  3008 0000419D 808F[75420100]94    <1> 	OR	byte [DSK_STATE+eDI], DRV_DET+MED_DET+RATE_250
  3009 000041A4 C3                  <1> 	RETn				; ALL INFORMATION SET
  3010                              <1> IS_80:
  3011 000041A5 808F[75420100]01    <1> 	OR	byte [DSK_STATE+eDI], TRK_CAPA ; SETUP 80 TRACK CAPABILITY
  3012                              <1> DD_BAC:
  3013 000041AC C3                  <1> 	RETn
  3014                              <1> POP_BAC:
  3015 000041AD 6659                <1> 	POP	CX			; THROW AWAY
  3016 000041AF C3                  <1> 	RETn
  3017                              <1> 
  3018                              <1> fdc_int:  
  3019                              <1> 	  ; 30/07/2015	
  3020                              <1> 	  ; 16/02/2015
  3021                              <1> ;int_0Eh: ; 11/12/2014
  3022                              <1> 
  3023                              <1> ;--- HARDWARE INT 0EH -- ( IRQ LEVEL  6 ) --------------------------------------
  3024                              <1> ; DISK_INT
  3025                              <1> ;	THIS ROUTINE HANDLES THE DISKETTE INTERRUPT.
  3026                              <1> ;
  3027                              <1> ; ON EXIT:	THE INTERRUPT FLAG IS SET IN @SEEK_STATUS.
  3028                              <1> ;-------------------------------------------------------------------------------
  3029                              <1> DISK_INT_1:
  3030                              <1> 
  3031 000041B0 6650                <1> 	PUSH	AX			; SAVE WORK REGISTER
  3032 000041B2 1E                  <1> 	push	ds
  3033 000041B3 66B81000            <1> 	mov	ax, KDATA
  3034 000041B7 8ED8                <1> 	mov 	ds, ax
  3035 000041B9 800D[65420100]80    <1>         OR      byte [SEEK_STATUS], INT_FLAG ; TURN ON INTERRUPT OCCURRED
  3036 000041C0 B020                <1> 	MOV     AL,EOI                  ; END OF INTERRUPT MARKER
  3037 000041C2 E620                <1> 	OUT	INTA00,AL		; INTERRUPT CONTROL PORT
  3038 000041C4 1F                  <1> 	pop	ds
  3039 000041C5 6658                <1> 	POP	AX			; RECOVER REGISTER
  3040 000041C7 CF                  <1> 	IRETd				; RETURN FROM INTERRUPT
  3041                              <1> 
  3042                              <1> ;-------------------------------------------------------------------------------
  3043                              <1> ; DSKETTE_SETUP
  3044                              <1> ;	THIS ROUTINE DOES A PRELIMINARY CHECK TO SEE WHAT TYPE OF
  3045                              <1> ;	DISKETTE DRIVES ARE ATTACH TO THE SYSTEM.
  3046                              <1> ;-------------------------------------------------------------------------------
  3047                              <1> 
  3048                              <1> ; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
  3049                              <1> 
  3050                              <1> DSKETTE_SETUP:
  3051                              <1> 	;PUSH	AX			; SAVE REGISTERS
  3052                              <1> 	;PUSH	BX
  3053                              <1> 	;PUSH	CX
  3054 000041C8 52                  <1> 	PUSH	eDX
  3055                              <1> 	;PUSH	DI
  3056                              <1> 	;;PUSH	DS
  3057                              <1> 	; 14/12/2014
  3058                              <1> 	;mov	word [DISK_POINTER], MD_TBL6
  3059                              <1> 	;mov	[DISK_POINTER+2], cs
  3060                              <1> 	;
  3061                              <1> 	;OR	byte [RTC_WAIT_FLAG], 1	; NO RTC WAIT, FORCE USE OF LOOP
  3062 000041C9 31FF                <1> 	XOR	eDI,eDI			; INITIALIZE DRIVE POINTER
  3063 000041CB 66C705[75420100]00- <1> 	MOV	WORD [DSK_STATE],0	; INITIALIZE STATES
  3063 000041D3 00                  <1>
  3064 000041D4 8025[70420100]33    <1> 	AND	byte [LASTRATE],~(STRT_MSK+SEND_MSK) ; CLEAR START & SEND
  3065 000041DB 800D[70420100]C0    <1> 	OR	byte [LASTRATE],SEND_MSK ; INITIALIZE SENT TO IMPOSSIBLE
  3066 000041E2 C605[65420100]00    <1> 	MOV	byte [SEEK_STATUS],0	; INDICATE RECALIBRATE NEEDED
  3067 000041E9 C605[67420100]00    <1> 	MOV	byte [MOTOR_COUNT],0	; INITIALIZE MOTOR COUNT
  3068 000041F0 C605[66420100]00    <1> 	MOV	byte [MOTOR_STATUS],0	; INITIALIZE DRIVES TO OFF STATE
  3069 000041F7 C605[68420100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; NO ERRORS
  3070                              <1> 	;
  3071                              <1> 	; 28/02/2015
  3072                              <1> 	;mov	word [cfd], 100h 
  3073 000041FE E848F2FFFF          <1> 	call	DSK_RESET
  3074 00004203 5A                  <1> 	pop	edx
  3075 00004204 F8                  <1> 	clc	; 29/05/2016
  3076 00004205 C3                  <1> 	retn
  3077                              <1> 
  3078                              <1> ;SUP0:
  3079                              <1> ;	CALL	DRIVE_DET		; DETERMINE DRIVE
  3080                              <1> ;	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  3081                              <1> ;	; 02/01/2015
  3082                              <1> ;	;INC	DI			; POINT TO NEXT DRIVE
  3083                              <1> ;	;CMP	DI,MAX_DRV		; SEE IF DONE
  3084                              <1> ;	;JNZ	short SUP0		; REPEAT FOR EACH ORIVE
  3085                              <1> ;       cmp     byte [fd1_type], 0	
  3086                              <1> ;	jna	short sup1
  3087                              <1> ;	or	di, di
  3088                              <1> ;	jnz	short sup1
  3089                              <1> ;	inc	di
  3090                              <1> ;       jmp     short SUP0
  3091                              <1> ;sup1:
  3092                              <1> ;	MOV	byte [SEEK_STATUS],0	; FORCE RECALIBRATE
  3093                              <1> ;	;AND	byte [RTC_WAIT_FLAG],0FEH ; ALLOW FOR RTC WAIT
  3094                              <1> ;	CALL	SETUP_END		; VARIOUS CLEANUPS
  3095                              <1> ;	;;POP	DS			; RESTORE CALLERS REGISTERS
  3096                              <1> ;	;POP	DI
  3097                              <1> ;	POP	eDX
  3098                              <1> ;	;POP	CX
  3099                              <1> ;	;POP	BX
  3100                              <1> ;	;POP	AX
  3101                              <1> ;	RETn
  3102                              <1> 
  3103                              <1> ;//////////////////////////////////////////////////////
  3104                              <1> ;; END OF DISKETTE I/O ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  3105                              <1> ;
  3106                              <1> 
  3107                              <1> int13h: ; 21/02/2015
  3108 00004206 9C                  <1> 	pushfd
  3109 00004207 0E                  <1> 	push 	cs
  3110 00004208 E843010000          <1> 	call 	DISK_IO
  3111 0000420D C3                  <1> 	retn
  3112                              <1> 
  3113                              <1> ;;;;;; DISK I/O ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 21/02/2015 ;;;
  3114                              <1> ;/////////////////////////////////////////////////////////////////////
  3115                              <1> 
  3116                              <1> ; DISK I/O - Erdogan Tan (Retro UNIX 386 v1 project)
  3117                              <1> ; 18/02/2016
  3118                              <1> ; 17/02/2016
  3119                              <1> ; 23/02/2015
  3120                              <1> ; 21/02/2015 (unix386.s)
  3121                              <1> ; 22/12/2014 - 14/02/2015 (dsectrm2.s)
  3122                              <1> ;
  3123                              <1> ; Original Source Code:
  3124                              <1> ; DISK ----- 09/25/85 FIXED DISK BIOS
  3125                              <1> ; (IBM PC XT Model 286 System BIOS Source Code, 04-21-86)
  3126                              <1> ;
  3127                              <1> ; Modifications: by reference of AWARD BIOS 1999 (D1A0622) 
  3128                              <1> ;		 Source Code - ATORGS.ASM, AHDSK.ASM
  3129                              <1> ;
  3130                              <1> 
  3131                              <1> 
  3132                              <1> ;The wait for controller to be not busy is 10 seconds.
  3133                              <1> ;10,000,000 / 30 = 333,333.  333,333 decimal = 051615h
  3134                              <1> ;;WAIT_HDU_CTLR_BUSY_LO	equ	1615h		
  3135                              <1> ;;WAIT_HDU_CTLR_BUSY_HI	equ	  05h
  3136                              <1> WAIT_HDU_CTRL_BUSY_LH	equ	51615h	 ;21/02/2015		
  3137                              <1> 
  3138                              <1> ;The wait for controller to issue completion interrupt is 10 seconds.
  3139                              <1> ;10,000,000 / 30 = 333,333.  333,333 decimal = 051615h
  3140                              <1> ;;WAIT_HDU_INT_LO	equ	1615h
  3141                              <1> ;;WAIT_HDU_INT_HI	equ	  05h
  3142                              <1> WAIT_HDU_INT_LH		equ	51615h	; 21/02/2015
  3143                              <1> 
  3144                              <1> ;The wait for Data request on read and write longs is
  3145                              <1> ;2000 us. (?)
  3146                              <1> ;;WAIT_HDU_DRQ_LO	equ	1000	; 03E8h
  3147                              <1> ;;WAIT_HDU_DRQ_HI	equ	0
  3148                              <1> WAIT_HDU_DRQ_LH		equ	1000	; 21/02/2015
  3149                              <1> 
  3150                              <1> ; Port 61h (PORT_B)
  3151                              <1> SYS1		equ	61h	; PORT_B  (diskette.inc)
  3152                              <1> 
  3153                              <1> ; 23/12/2014
  3154                              <1> %define CMD_BLOCK       eBP-8  ; 21/02/2015
  3155                              <1> 
  3156                              <1> 
  3157                              <1> ;--- INT 13H -------------------------------------------------------------------
  3158                              <1> ;									       :
  3159                              <1> ; FIXED DISK I/O INTERFACE						       :
  3160                              <1> ;									       :
  3161                              <1> ;	THIS INTERFACE PROVIDES ACCESS TO 5 1/4" FIXED DISKS THROUGH           :
  3162                              <1> ;	THE IBM FIXED DISK CONTROLLER.					       :
  3163                              <1> ;									       :
  3164                              <1> ;	THE  BIOS  ROUTINES  ARE  MEANT  TO  BE  ACCESSED  THROUGH	       :
  3165                              <1> ;	SOFTWARE  INTERRUPTS  ONLY.    ANY  ADDRESSES  PRESENT	IN	       :
  3166                              <1> ;	THESE  LISTINGS  ARE  INCLUDED	 ONLY	FOR  COMPLETENESS,	       :
  3167                              <1> ;	NOT  FOR  REFERENCE.  APPLICATIONS   WHICH  REFERENCE  ANY	       :
  3168                              <1> ;	ABSOLUTE  ADDRESSES  WITHIN  THE  CODE	SEGMENTS  OF  BIOS	       :
  3169                              <1> ;	VIOLATE  THE  STRUCTURE  AND  DESIGN  OF  BIOS. 		       :
  3170                              <1> ;									       :
  3171                              <1> ;------------------------------------------------------------------------------:
  3172                              <1> ;									       :
  3173                              <1> ; INPUT  (AH)= HEX COMMAND VALUE					       :
  3174                              <1> ;									       :
  3175                              <1> ;	(AH)= 00H  RESET DISK (DL = 80H,81H) / DISKETTE 		       :
  3176                              <1> ;	(AH)= 01H  READ THE STATUS OF THE LAST DISK OPERATION INTO (AL)        :
  3177                              <1> ;		    NOTE: DL < 80H - DISKETTE				       :
  3178                              <1> ;			  DL > 80H - DISK				       :
  3179                              <1> ;	(AH)= 02H  READ THE DESIRED SECTORS INTO MEMORY 		       :
  3180                              <1> ;	(AH)= 03H  WRITE THE DESIRED SECTORS FROM MEMORY		       :
  3181                              <1> ;	(AH)= 04H  VERIFY THE DESIRED SECTORS				       :
  3182                              <1> ;	(AH)= 05H  FORMAT THE DESIRED TRACK				       :
  3183                              <1> ;	(AH)= 06H  UNUSED						       :
  3184                              <1> ;	(AH)= 07H  UNUSED						       :
  3185                              <1> ;	(AH)= 08H  RETURN THE CURRENT DRIVE PARAMETERS			       :
  3186                              <1> ;	(AH)= 09H  INITIALIZE DRIVE PAIR CHARACTERISTICS		       :
  3187                              <1> ;		    INTERRUPT 41 POINTS TO DATA BLOCK FOR DRIVE 0	       :
  3188                              <1> ;		    INTERRUPT 46 POINTS TO DATA BLOCK FOR DRIVE 1	       :
  3189                              <1> ;	(AH)= 0AH  READ LONG						       :
  3190                              <1> ;	(AH)= 0BH  WRITE LONG  (READ & WRITE LONG ENCOMPASS 512 + 4 BYTES ECC) :
  3191                              <1> ;	(AH)= 0CH  SEEK 						       :
  3192                              <1> ;	(AH)= 0DH  ALTERNATE DISK RESET (SEE DL)			       :
  3193                              <1> ;	(AH)= 0EH  UNUSED						       :
  3194                              <1> ;	(AH)= 0FH  UNUSED						       :
  3195                              <1> ;	(AH)= 10H  TEST DRIVE READY					       :
  3196                              <1> ;	(AH)= 11H  RECALIBRATE						       :
  3197                              <1> ;	(AH)= 12H  UNUSED						       :
  3198                              <1> ;	(AH)= 13H  UNUSED						       :
  3199                              <1> ;	(AH)= 14H  CONTROLLER INTERNAL DIAGNOSTIC			       :
  3200                              <1> ;	(AH)= 15H  READ DASD TYPE					       :
  3201                              <1> ;									       :
  3202                              <1> ;-------------------------------------------------------------------------------
  3203                              <1> ;									       :
  3204                              <1> ;	REGISTERS USED FOR FIXED DISK OPERATIONS			       :
  3205                              <1> ;									       :
  3206                              <1> ;		(DL)	-  DRIVE NUMBER     (80H-81H FOR DISK. VALUE CHECKED)  :
  3207                              <1> ;		(DH)	-  HEAD NUMBER	    (0-15 ALLOWED, NOT VALUE CHECKED)  :
  3208                              <1> ;		(CH)	-  CYLINDER NUMBER  (0-1023, NOT VALUE CHECKED)(SEE CL):
  3209                              <1> ;		(CL)	-  SECTOR NUMBER    (1-17, NOT VALUE CHECKED)	       :
  3210                              <1> ;									       :
  3211                              <1> ;			   NOTE: HIGH 2 BITS OF CYLINDER NUMBER ARE PLACED     :
  3212                              <1> ;				 IN THE HIGH 2 BITS OF THE CL REGISTER	       :
  3213                              <1> ;				 (10 BITS TOTAL)			       :
  3214                              <1> ;									       :
  3215                              <1> ;		(AL)	-  NUMBER OF SECTORS (MAXIMUM POSSIBLE RANGE 1-80H,    :
  3216                              <1> ;					      FOR READ/WRITE LONG 1-79H)       :
  3217                              <1> ;									       :
  3218                              <1> ;		(ES:BX) -  ADDRESS OF BUFFER FOR READS AND WRITES,	       :
  3219                              <1> ;			   (NOT REQUIRED FOR VERIFY)			       :
  3220                              <1> ;									       :
  3221                              <1> ;		FORMAT (AH=5) ES:BX POINTS TO A 512 BYTE BUFFER. THE FIRST     :
  3222                              <1> ;			   2*(SECTORS/TRACK) BYTES CONTAIN F,N FOR EACH SECTOR.:
  3223                              <1> ;			   F = 00H FOR A GOOD SECTOR			       :
  3224                              <1> ;			       80H FOR A BAD SECTOR			       :
  3225                              <1> ;			   N = SECTOR NUMBER				       :
  3226                              <1> ;			   FOR AN INTERLEAVE OF 2 AND 17 SECTORS/TRACK	       :
  3227                              <1> ;			   THE TABLE SHOULD BE: 			       :
  3228                              <1> ;									       :
  3229                              <1> ;		   DB	   00H,01H,00H,0AH,00H,02H,00H,0BH,00H,03H,00H,0CH     :
  3230                              <1> ;		   DB	   00H,04H,00H,0DH,00H,05H,00H,0EH,00H,06H,00H,0FH     :
  3231                              <1> ;		   DB	   00H,07H,00H,10H,00H,08H,00H,11H,00H,09H	       :
  3232                              <1> ;									       :
  3233                              <1> ;-------------------------------------------------------------------------------
  3234                              <1> 
  3235                              <1> ;-------------------------------------------------------------------------------
  3236                              <1> ; OUTPUT								       :
  3237                              <1> ;	AH = STATUS OF CURRENT OPERATION				       :
  3238                              <1> ;	     STATUS BITS ARE DEFINED IN THE EQUATES BELOW		       :
  3239                              <1> ;	CY = 0	SUCCESSFUL OPERATION (AH=0 ON RETURN)			       :
  3240                              <1> ;	CY = 1	FAILED OPERATION (AH HAS ERROR REASON)			       :
  3241                              <1> ;									       :
  3242                              <1> ;	NOTE:	ERROR 11H  INDICATES THAT THE DATA READ HAD A RECOVERABLE      :
  3243                              <1> ;		ERROR WHICH WAS CORRECTED BY THE ECC ALGORITHM.  THE DATA      :
  3244                              <1> ;		IS PROBABLY GOOD,   HOWEVER THE BIOS ROUTINE INDICATES AN      :
  3245                              <1> ;		ERROR TO ALLOW THE CONTROLLING PROGRAM A CHANCE TO DECIDE      :
  3246                              <1> ;		FOR ITSELF.  THE  ERROR  MAY  NOT  RECUR  IF  THE DATA IS      :
  3247                              <1> ;		REWRITTEN.						       :
  3248                              <1> ;									       :
  3249                              <1> ;	IF DRIVE PARAMETERS WERE REQUESTED (DL >= 80H), 		       :
  3250                              <1> ;	   INPUT:							       :
  3251                              <1> ;	     (DL) = DRIVE NUMBER					       :	
  3252                              <1> ;	     ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)						       :	 	
  3253                              <1> ;	     EBX = Buffer address for fixed disk parameters table (32 bytes)   :
  3254                              <1> ;	   OUTPUT:							       :
  3255                              <1> ;	     (DL) = NUMBER OF CONSECUTIVE ACKNOWLEDGING DRIVES ATTACHED (1-2)  :
  3256                              <1> ;		    (CONTROLLER CARD ZERO TALLY ONLY)			       :
  3257                              <1> ;	     (DH) = MAXIMUM USEABLE VALUE FOR HEAD NUMBER		       :
  3258                              <1> ;	     (CH) = MAXIMUM USEABLE VALUE FOR CYLINDER NUMBER		       :
  3259                              <1> ;	     (CL) = MAXIMUM USEABLE VALUE FOR SECTOR NUMBER		       :
  3260                              <1> ;		    AND CYLINDER NUMBER HIGH BITS			       :
  3261                              <1> ;									       :
  3262                              <1> ;	IF READ DASD TYPE WAS REQUESTED,				       :
  3263                              <1> ;									       :
  3264                              <1> ;	AH = 0 - NOT PRESENT						       :
  3265                              <1> ;	     1 - DISKETTE - NO CHANGE LINE AVAILABLE			       :
  3266                              <1> ;	     2 - DISKETTE - CHANGE LINE AVAILABLE			       :
  3267                              <1> ;	     3 - FIXED DISK						       :
  3268                              <1> ;									       :
  3269                              <1> ;	CX,DX = NUMBER OF 512 BYTE BLOCKS WHEN AH = 3			       :
  3270                              <1> ;									       :
  3271                              <1> ;	REGISTERS WILL BE PRESERVED EXCEPT WHEN THEY ARE USED TO RETURN        :
  3272                              <1> ;	INFORMATION.							       :
  3273                              <1> ;									       :
  3274                              <1> ;	NOTE: IF AN ERROR IS REPORTED BY THE DISK CODE, THE APPROPRIATE        :
  3275                              <1> ;		ACTION IS TO RESET THE DISK, THEN RETRY THE OPERATION.	       :
  3276                              <1> ;									       :
  3277                              <1> ;-------------------------------------------------------------------------------
  3278                              <1> 
  3279                              <1> SENSE_FAIL	EQU	0FFH		; NOT IMPLEMENTED
  3280                              <1> NO_ERR		EQU	0E0H		; STATUS ERROR/ERROR REGISTER=0
  3281                              <1> WRITE_FAULT	EQU	0CCH		; WRITE FAULT ON SELECTED DRIVE
  3282                              <1> UNDEF_ERR	EQU	0BBH		; UNDEFINED ERROR OCCURRED
  3283                              <1> NOT_RDY 	EQU	0AAH		; DRIVE NOT READY
  3284                              <1> TIME_OUT	EQU	80H		; ATTACHMENT FAILED TO RESPOND
  3285                              <1> BAD_SEEK	EQU	40H		; SEEK OPERATION FAILED
  3286                              <1> BAD_CNTLR	EQU	20H		; CONTROLLER HAS FAILED
  3287                              <1> DATA_CORRECTED	EQU	11H		; ECC CORRECTED DATA ERROR
  3288                              <1> BAD_ECC 	EQU	10H		; BAD ECC ON DISK READ
  3289                              <1> BAD_TRACK	EQU	0BH		; NOT IMPLEMENTED
  3290                              <1> BAD_SECTOR	EQU	0AH		; BAD SECTOR FLAG DETECTED
  3291                              <1> ;DMA_BOUNDARY	EQU	09H		; DATA EXTENDS TOO FAR
  3292                              <1> INIT_FAIL	EQU	07H		; DRIVE PARAMETER ACTIVITY FAILED
  3293                              <1> BAD_RESET	EQU	05H		; RESET FAILED
  3294                              <1> ;RECORD_NOT_FND	EQU	04H		; REQUESTED SECTOR NOT FOUND
  3295                              <1> ;BAD_ADDR_MARK	EQU	02H		; ADDRESS MARK NOT FOUND
  3296                              <1> ;BAD_CMD 	EQU	01H		; BAD COMMAND PASSED TO DISK I/O
  3297                              <1> 
  3298                              <1> ;--------------------------------------------------------
  3299                              <1> ;							:
  3300                              <1> ; FIXED DISK PARAMETER TABLE				:
  3301                              <1> ;  -  THE TABLE IS COMPOSED OF A BLOCK DEFINED AS:	:
  3302                              <1> ;							:
  3303                              <1> ;  +0	(1 WORD) - MAXIMUM NUMBER OF CYLINDERS		:
  3304                              <1> ;  +2	(1 BYTE) - MAXIMUM NUMBER OF HEADS		:
  3305                              <1> ;  +3	(1 WORD) - NOT USED/SEE PC-XT			:
  3306                              <1> ;  +5	(1 WORD) - STARTING WRITE PRECOMPENSATION CYL	:
  3307                              <1> ;  +7	(1 BYTE) - MAXIMUM ECC DATA BURST LENGTH	:
  3308                              <1> ;  +8	(1 BYTE) - CONTROL BYTE 			:
  3309                              <1> ;		   BIT	  7 DISABLE RETRIES -OR-	:
  3310                              <1> ;		   BIT	  6 DISABLE RETRIES		:
  3311                              <1> ;		   BIT	  3 MORE THAN 8 HEADS		:
  3312                              <1> ;  +9	(3 BYTES)- NOT USED/SEE PC-XT			:
  3313                              <1> ; +12	(1 WORD) - LANDING ZONE 			:
  3314                              <1> ; +14	(1 BYTE) - NUMBER OF SECTORS/TRACK		:
  3315                              <1> ; +15	(1 BYTE) - RESERVED FOR FUTURE USE		:
  3316                              <1> ;							:
  3317                              <1> ;	 - TO DYNAMICALLY DEFINE A SET OF PARAMETERS	:
  3318                              <1> ;	   BUILD A TABLE FOR UP TO 15 TYPES AND PLACE	:
  3319                              <1> ;	   THE CORRESPONDING VECTOR INTO INTERRUPT 41	:
  3320                              <1> ;	   FOR DRIVE 0 AND INTERRUPT 46 FOR DRIVE 1.	:
  3321                              <1> ;							:
  3322                              <1> ;--------------------------------------------------------
  3323                              <1> 
  3324                              <1> ;--------------------------------------------------------
  3325                              <1> ;							:
  3326                              <1> ; HARDWARE SPECIFIC VALUES				:
  3327                              <1> ;							:
  3328                              <1> ;  -  CONTROLLER I/O PORT				:
  3329                              <1> ;							:
  3330                              <1> ;     > WHEN READ FROM: 				:
  3331                              <1> ;	HF_PORT+0 - READ DATA (FROM CONTROLLER TO CPU)	:
  3332                              <1> ;	HF_PORT+1 - GET ERROR REGISTER			:
  3333                              <1> ;	HF_PORT+2 - GET SECTOR COUNT			:
  3334                              <1> ;	HF_PORT+3 - GET SECTOR NUMBER			:
  3335                              <1> ;	HF_PORT+4 - GET CYLINDER LOW			:
  3336                              <1> ;	HF_PORT+5 - GET CYLINDER HIGH (2 BITS)		:
  3337                              <1> ;	HF_PORT+6 - GET SIZE/DRIVE/HEAD 		:
  3338                              <1> ;	HF_PORT+7 - GET STATUS REGISTER 		:
  3339                              <1> ;							:
  3340                              <1> ;     > WHEN WRITTEN TO:				:
  3341                              <1> ;	HF_PORT+0 - WRITE DATA (FROM CPU TO CONTROLLER) :
  3342                              <1> ;	HF_PORT+1 - SET PRECOMPENSATION CYLINDER	:
  3343                              <1> ;	HF_PORT+2 - SET SECTOR COUNT			:
  3344                              <1> ;	HF_PORT+3 - SET SECTOR NUMBER			:
  3345                              <1> ;	HF_PORT+4 - SET CYLINDER LOW			:
  3346                              <1> ;	HF_PORT+5 - SET CYLINDER HIGH (2 BITS)		:
  3347                              <1> ;	HF_PORT+6 - SET SIZE/DRIVE/HEAD 		:
  3348                              <1> ;	HF_PORT+7 - SET COMMAND REGISTER		:
  3349                              <1> ;							:
  3350                              <1> ;--------------------------------------------------------
  3351                              <1> 
  3352                              <1> ;HF_PORT 	EQU	01F0H	; DISK PORT
  3353                              <1> ;HF1_PORT	equ	0170h	
  3354                              <1> ;HF_REG_PORT	EQU	03F6H
  3355                              <1> ;HF1_REG_PORT	equ	0376h
  3356                              <1> 
  3357                              <1> HDC1_BASEPORT	equ	1F0h
  3358                              <1> HDC2_BASEPORT	equ	170h		
  3359                              <1> 
  3360                              <1> align 2
  3361                              <1> 
  3362                              <1> ;-----		STATUS REGISTER
  3363                              <1> 
  3364                              <1> ST_ERROR	EQU	00000001B	;
  3365                              <1> ST_INDEX	EQU	00000010B	;
  3366                              <1> ST_CORRCTD	EQU	00000100B	; ECC CORRECTION SUCCESSFUL
  3367                              <1> ST_DRQ		EQU	00001000B	;
  3368                              <1> ST_SEEK_COMPL	EQU	00010000B	; SEEK COMPLETE
  3369                              <1> ST_WRT_FLT	EQU	00100000B	; WRITE FAULT
  3370                              <1> ST_READY	EQU	01000000B	;
  3371                              <1> ST_BUSY 	EQU	10000000B	;
  3372                              <1> 
  3373                              <1> ;-----		ERROR REGISTER
  3374                              <1> 
  3375                              <1> ERR_DAM 	EQU	00000001B	; DATA ADDRESS MARK NOT FOUND
  3376                              <1> ERR_TRK_0	EQU	00000010B	; TRACK 0 NOT FOUND ON RECAL
  3377                              <1> ERR_ABORT	EQU	00000100B	; ABORTED COMMAND
  3378                              <1> ;		EQU	00001000B	; NOT USED
  3379                              <1> ERR_ID		EQU	00010000B	; ID NOT FOUND
  3380                              <1> ;		EQU	00100000B	; NOT USED
  3381                              <1> ERR_DATA_ECC	EQU	01000000B
  3382                              <1> ERR_BAD_BLOCK	EQU	10000000B
  3383                              <1> 
  3384                              <1> 
  3385                              <1> RECAL_CMD	EQU	00010000B	; DRIVE RECAL	(10H)
  3386                              <1> READ_CMD	EQU	00100000B	;	READ	(20H)
  3387                              <1> WRITE_CMD	EQU	00110000B	;	WRITE	(30H)
  3388                              <1> VERIFY_CMD	EQU	01000000B	;	VERIFY	(40H)
  3389                              <1> FMTTRK_CMD	EQU	01010000B	; FORMAT TRACK	(50H)
  3390                              <1> INIT_CMD	EQU	01100000B	;   INITIALIZE	(60H)
  3391                              <1> SEEK_CMD	EQU	01110000B	;	SEEK	(70H)
  3392                              <1> DIAG_CMD	EQU	10010000B	; DIAGNOSTIC	(90H)
  3393                              <1> SET_PARM_CMD	EQU	10010001B	; DRIVE PARMS	(91H)
  3394                              <1> NO_RETRIES	EQU	00000001B	; CHD MODIFIER	(01H)
  3395                              <1> ECC_MODE	EQU	00000010B	; CMD MODIFIER	(02H)
  3396                              <1> BUFFER_MODE	EQU	00001000B	; CMD MODIFIER	(08H)
  3397                              <1> 
  3398                              <1> ;MAX_FILE	EQU	2
  3399                              <1> ;S_MAX_FILE	EQU	2
  3400                              <1> MAX_FILE	equ	4		; 22/12/2014
  3401                              <1> S_MAX_FILE	equ	4		; 22/12/2014
  3402                              <1> 
  3403                              <1> DELAY_1 	EQU	25H		; DELAY FOR OPERATION COMPLETE
  3404                              <1> DELAY_2 	EQU	0600H		; DELAY FOR READY
  3405                              <1> DELAY_3 	EQU	0100H		; DELAY FOR DATA REQUEST
  3406                              <1> 
  3407                              <1> HF_FAIL 	EQU	08H		; CMOS FLAG IN BYTE 0EH
  3408                              <1> 
  3409                              <1> ;-----		COMMAND BLOCK REFERENCE
  3410                              <1> 
  3411                              <1> ;CMD_BLOCK      EQU     BP-8            ; @CMD_BLOCK REFERENCES BLOCK HEAD IN SS
  3412                              <1> 					;  (BP) POINTS TO COMMAND BLOCK TAIL
  3413                              <1> 					;	AS DEFINED BY THE "ENTER" PARMS
  3414                              <1> ; 19/12/2014
  3415                              <1> ORG_VECTOR	equ	4*13h		; INT 13h vector
  3416                              <1> DISK_VECTOR	equ	4*40h		; INT 40h vector (for floppy disks)
  3417                              <1> ;HDISK_INT	equ	4*76h		; Primary HDC - Hardware interrupt (IRQ14)
  3418                              <1> ;HDISK_INT1	equ	4*76h		; Primary HDC - Hardware interrupt (IRQ14)
  3419                              <1> ;HDISK_INT2	equ	4*77h		; Secondary HDC - Hardware interrupt (IRQ15)
  3420                              <1> ;HF_TBL_VEC	equ	4*41h		; Pointer to 1st fixed disk parameter table
  3421                              <1> ;HF1_TBL_VEC	equ	4*46h		; Pointer to 2nd fixed disk parameter table
  3422                              <1> 
  3423                              <1> align 2
  3424                              <1> 
  3425                              <1> ;----------------------------------------------------------------
  3426                              <1> ; FIXED DISK I/O SETUP						:
  3427                              <1> ;								:
  3428                              <1> ;  -  ESTABLISH TRANSFER VECTORS FOR THE FIXED DISK		:
  3429                              <1> ;  -  PERFORM POWER ON DIAGNOSTICS				:
  3430                              <1> ;     SHOULD AN ERROR OCCUR A "1701" MESSAGE IS DISPLAYED       :
  3431                              <1> ;								:
  3432                              <1> ;----------------------------------------------------------------
  3433                              <1> 
  3434                              <1> ; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
  3435                              <1> 
  3436                              <1> DISK_SETUP:
  3437                              <1> 	;CLI
  3438                              <1> 	;;MOV	AX,ABS0 			; GET ABSOLUTE SEGMENT
  3439                              <1> 	;xor	ax,ax
  3440                              <1> 	;MOV	DS,AX				; SET SEGMENT REGISTER
  3441                              <1> 	;MOV	AX, [ORG_VECTOR] 		; GET DISKETTE VECTOR
  3442                              <1> 	;MOV	[DISK_VECTOR],AX		;  INTO INT 40H
  3443                              <1> 	;MOV	AX, [ORG_VECTOR+2]
  3444                              <1> 	;MOV	[DISK_VECTOR+2],AX
  3445                              <1> 	;MOV	word [ORG_VECTOR],DISK_IO	; FIXED DISK HANDLER
  3446                              <1> 	;MOV	[ORG_VECTOR+2],CS
  3447                              <1> 	; 1st controller (primary master, slave)   - IRQ 14
  3448                              <1> 	;;MOV	word [HDISK_INT],HD_INT		; FIXED DISK INTERRUPT
  3449                              <1> 	;mov	word [HDISK_INT1],HD_INT	;
  3450                              <1> 	;;MOV	[HDISK_INT+2],CS
  3451                              <1> 	;mov	[HDISK_INT1+2],CS
  3452                              <1> 	; 2nd controller (secondary master, slave) - IRQ 15
  3453                              <1> 	;mov	word [HDISK_INT2],HD1_INT	;
  3454                              <1> 	;mov	[HDISK_INT2+2],CS
  3455                              <1> 	;
  3456                              <1> 	;;MOV	word [HF_TBL_VEC],HD0_DPT	; PARM TABLE DRIVE 80
  3457                              <1> 	;;MOV	word [HF_TBL_VEC+2],DPT_SEGM
  3458                              <1> 	;;MOV	word [HF1_TBL_VEC],HD1_DPT	; PARM TABLE DRIVE 81
  3459                              <1> 	;;MOV	word [HF1_TBL_VEC+2],DPT_SEGM
  3460                              <1> 	;push	cs
  3461                              <1> 	;pop	ds
  3462                              <1> 	;mov	word [HDPM_TBL_VEC],HD0_DPT	; PARM TABLE DRIVE 80h
  3463                              <1> 	;mov	word [HDPM_TBL_VEC+2],DPT_SEGM
  3464 0000420E C705[80420100]0000- <1> 	mov 	dword [HDPM_TBL_VEC], (DPT_SEGM*16)+HD0_DPT
  3464 00004216 0900                <1>
  3465                              <1> 	;mov	word [HDPS_TBL_VEC],HD1_DPT	; PARM TABLE DRIVE 81h
  3466                              <1> 	;mov	word [HDPS_TBL_VEC+2],DPT_SEGM
  3467 00004218 C705[84420100]2000- <1> 	mov 	dword [HDPS_TBL_VEC], (DPT_SEGM*16)+HD1_DPT
  3467 00004220 0900                <1>
  3468                              <1> 	;mov	word [HDSM_TBL_VEC],HD2_DPT	; PARM TABLE DRIVE 82h
  3469                              <1> 	;mov	word [HDSM_TBL_VEC+2],DPT_SEGM
  3470 00004222 C705[88420100]4000- <1> 	mov 	dword [HDSM_TBL_VEC], (DPT_SEGM*16)+HD2_DPT
  3470 0000422A 0900                <1>
  3471                              <1> 	;mov	word [HDSS_TBL_VEC],HD3_DPT	; PARM TABLE DRIVE 83h
  3472                              <1> 	;mov	word [HDSS_TBL_VEC+2],DPT_SEGM
  3473 0000422C C705[8C420100]6000- <1> 	mov 	dword [HDSS_TBL_VEC], (DPT_SEGM*16)+HD3_DPT
  3473 00004234 0900                <1>
  3474                              <1> 	;
  3475                              <1> 	;;IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  3476                              <1> 	;;;AND	AL,0BFH
  3477                              <1> 	;;and	al, 3Fh			; enable IRQ 14 and IRQ 15
  3478                              <1> 	;;;JMP	$+2
  3479                              <1> 	;;IODELAY
  3480                              <1> 	;;OUT	INTB01,AL
  3481                              <1> 	;;IODELAY
  3482                              <1> 	;;IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  3483                              <1> 	;;AND	AL,0FBH 		;  SECOND CHIP
  3484                              <1> 	;;;JMP	$+2
  3485                              <1> 	;;IODELAY
  3486                              <1> 	;;OUT	INTA01,AL
  3487                              <1> 	;
  3488                              <1> 	;STI
  3489                              <1> 	;;PUSH	DS			; MOVE ABS0 POINTER TO
  3490                              <1> 	;;POP	ES			; EXTRA SEGMENT POINTER
  3491                              <1> 	;;;CALL	DDS			; ESTABLISH DATA SEGMENT
  3492                              <1> 	;;MOV	byte [DISK_STATUS1],0 	; RESET THE STATUS INDICATOR
  3493                              <1> 	;;MOV	byte [HF_NUM],0		; ZERO NUMBER OF FIXED DISKS
  3494                              <1> 	;;MOV	byte [CONTROL_BYTE],0
  3495                              <1> 	;;MOV	byte [PORT_OFF],0	; ZERO CARD OFFSET
  3496                              <1> 	; 20/12/2014 - private code by Erdogan Tan
  3497                              <1> 		      ; (out of original PC-AT, PC-XT BIOS code)
  3498                              <1> 	;mov	si, hd0_type
  3499 00004236 BE[585C0000]        <1> 	mov	esi, hd0_type
  3500                              <1> 	;mov	cx, 4
  3501 0000423B B904000000          <1> 	mov	ecx, 4
  3502                              <1> hde_l:
  3503 00004240 AC                  <1> 	lodsb
  3504 00004241 3C80                <1> 	cmp	al, 80h			; 8?h = existing
  3505 00004243 7206                <1> 	jb	short _L4
  3506 00004245 FE05[7C420100]      <1> 	inc	byte [HF_NUM]		; + 1 hard (fixed) disk drives
  3507                              <1> _L4: ; 26/02/2015
  3508 0000424B E2F3                <1> 	loop	hde_l	
  3509                              <1> ;_L4:					; 0 <= [HF_NUM] =< 4
  3510                              <1> ;L4:
  3511                              <1> 	; 
  3512                              <1> 	;; 31/12/2014 - cancel controller diagnostics here
  3513                              <1> 	;;;mov 	cx, 3  ; 26/12/2014 (Award BIOS 1999)
  3514                              <1> 	;;mov 	cl, 3
  3515                              <1> 	;;
  3516                              <1> 	;;MOV	DL,80H			; CHECK THE CONTROLLER
  3517                              <1> ;;hdc_dl:
  3518                              <1> 	;;MOV	AH,14H			; USE CONTROLLER DIAGNOSTIC COMMAND
  3519                              <1> 	;;INT	13H			; CALL BIOS WITH DIAGNOSTIC COMMAND
  3520                              <1> 	;;;JC	short CTL_ERRX		; DISPLAY ERROR MESSAGE IF BAD RETURN
  3521                              <1> 	;;;jc	short POD_DONE ;22/12/2014
  3522                              <1> 	;;jnc	short hdc_reset0
  3523                              <1> 	;;loop	hdc_dl
  3524                              <1> 	;;; 27/12/2014
  3525                              <1> 	;;stc
  3526                              <1> 	;;retn
  3527                              <1> 	;
  3528                              <1> ;;hdc_reset0:
  3529                              <1> 	; 18/01/2015
  3530 0000424D 8A0D[7C420100]      <1> 	mov	cl, [HF_NUM]
  3531 00004253 20C9                <1> 	and	cl, cl
  3532 00004255 740E                <1> 	jz	short POD_DONE
  3533                              <1> 	;
  3534 00004257 B27F                <1> 	mov	dl, 7Fh
  3535                              <1> hdc_reset1:
  3536 00004259 FEC2                <1> 	inc	dl
  3537                              <1> 	;; 31/12/2015
  3538                              <1> 	;;push	dx
  3539                              <1> 	;;push	cx
  3540                              <1> 	;;push	ds
  3541                              <1> 	;;sub	ax, ax
  3542                              <1> 	;;mov	ds, ax
  3543                              <1> 	;;MOV	AX, [TIMER_LOW]		; GET START TIMER COUNTS
  3544                              <1> 	;;pop	ds
  3545                              <1> 	;;MOV	BX,AX
  3546                              <1> 	;;ADD	AX,6*182		; 60 SECONDS* 18.2
  3547                              <1> 	;;MOV	CX,AX
  3548                              <1> 	;;mov	word [wait_count], 0	; 22/12/2014 (reset wait counter)
  3549                              <1> 	;;
  3550                              <1> 	;; 31/12/2014 - cancel HD_RESET_1
  3551                              <1> 	;;CALL	HD_RESET_1		; SET UP DRIVE 0, (1,2,3)
  3552                              <1> 	;;pop	cx
  3553                              <1> 	;;pop	dx
  3554                              <1> 	;;
  3555                              <1> 	; 18/01/2015
  3556 0000425B B40D                <1> 	mov	ah, 0Dh ; ALTERNATE RESET
  3557                              <1> 	;int	13h
  3558 0000425D E8A4FFFFFF          <1> 	call	int13h
  3559 00004262 E2F5                <1> 	loop	hdc_reset1
  3560 00004264 F8                  <1> 	clc 	; 29/05/2016
  3561                              <1> POD_DONE:
  3562 00004265 C3                  <1> 	RETn
  3563                              <1> 
  3564                              <1> ;;-----	POD_ERROR
  3565                              <1> 
  3566                              <1> ;;CTL_ERRX:
  3567                              <1> ;	;MOV	SI,OFFSET F1782 	; CONTROLLER ERROR
  3568                              <1> ;	;CALL	SET_FAIL		; DO NOT IPL FROM DISK
  3569                              <1> ;	;CALL	E_MSG			; DISPLAY ERROR AND SET (BP) ERROR FLAG
  3570                              <1> ;	;JMP	short POD_DONE
  3571                              <1> 
  3572                              <1> ;;HD_RESET_1:
  3573                              <1> ;;	;PUSH	BX			; SAVE TIMER LIMITS
  3574                              <1> ;;	;PUSH	CX
  3575                              <1> ;;RES_1: MOV	AH,09H			; SET DRIVE PARAMETERS
  3576                              <1> ;;	INT	13H
  3577                              <1> ;;	JC	short RES_2
  3578                              <1> ;;	MOV	AH,11H			; RECALIBRATE DRIVE
  3579                              <1> ;;	INT	13H
  3580                              <1> ;;	JNC	short RES_CK		; DRIVE OK
  3581                              <1> ;;RES_2: ;CALL	POD_TCHK		; CHECK TIME OUT
  3582                              <1> ;;	cmp	word [wait_count], 6*182 ; waiting time (in timer ticks)
  3583                              <1> ;;					; (30 seconds)		
  3584                              <1> ;;	;cmc
  3585                              <1> ;;	;JNC	short RES_1
  3586                              <1> ;;	jb	short RES_1
  3587                              <1> ;;;RES_FL: ;MOV	SI,OFFSET F1781 	; INDICATE DISK 1 FAILURE;
  3588                              <1> ;;	;TEST	DL,1
  3589                              <1> ;;	;JNZ	RES_E1
  3590                              <1> ;;	;MOV	SI,OFFSET F1780 	; INDICATE DISK 0 FAILURE
  3591                              <1> ;;	;CALL	SET_FAIL		; DO NOT TRY TO IPL DISK 0
  3592                              <1> ;;	;JMP	SHORT RES_E1
  3593                              <1> ;;RES_ER: ; 22/12/2014
  3594                              <1> ;;RES_OK:
  3595                              <1> ;;	;POP	CX			; RESTORE TIMER LIMITS
  3596                              <1> ;;	;POP	BX
  3597                              <1> ;;	RETn
  3598                              <1> ;;
  3599                              <1> ;;RES_RS: MOV	AH,00H			; RESET THE DRIVE
  3600                              <1> ;;	INT	13H
  3601                              <1> ;;RES_CK: MOV	AH,08H			; GET MAX CYLINDER,HEAD,SECTOR
  3602                              <1> ;;	MOV	BL,DL			; SAVE DRIVE CODE
  3603                              <1> ;;	INT	13H
  3604                              <1> ;;	JC	short RES_ER
  3605                              <1> ;;	MOV	[NEC_STATUS],CX 	; SAVE MAX CYLINDER, SECTOR
  3606                              <1> ;;	MOV	DL,BL			; RESTORE DRIVE CODE
  3607                              <1> ;;RES_3: MOV	AX,0401H		; VERIFY THE LAST SECTOR
  3608                              <1> ;;	INT	13H
  3609                              <1> ;;	JNC	short RES_OK		; VERIFY OK
  3610                              <1> ;;	CMP	AH,BAD_SECTOR		; OK ALSO IF JUST ID READ
  3611                              <1> ;;	JE	short RES_OK
  3612                              <1> ;;	CMP	AH,DATA_CORRECTED
  3613                              <1> ;;	JE	short RES_OK
  3614                              <1> ;;	CMP	AH,BAD_ECC
  3615                              <1> ;;	JE	short RES_OK
  3616                              <1> ;;	;CALL	POD_TCHK		; CHECK FOR TIME OUT
  3617                              <1> ;;	cmp	word [wait_count], 6*182 ; waiting time (in timer ticks)
  3618                              <1> ;;					; (60 seconds)		
  3619                              <1> ;;	cmc
  3620                              <1> ;;	JC	short RES_ER		; FAILED
  3621                              <1> ;;	MOV	CX,[NEC_STATUS] 	; GET SECTOR ADDRESS, AND CYLINDER
  3622                              <1> ;;	MOV	AL,CL			; SEPARATE OUT SECTOR NUMBER
  3623                              <1> ;;	AND	AL,3FH
  3624                              <1> ;;	DEC	AL			; TRY PREVIOUS ONE
  3625                              <1> ;;	JZ	short RES_RS		; WE'VE TRIED ALL SECTORS ON TRACK
  3626                              <1> ;;	AND	CL,0C0H 		; KEEP CYLINDER BITS
  3627                              <1> ;;	OR	CL,AL			; MERGE SECTOR WITH CYLINDER BITS
  3628                              <1> ;;	MOV	[NEC_STATUS],CX 	; SAVE CYLINDER, NEW SECTOR NUMBER
  3629                              <1> ;;	JMP	short RES_3		; TRY AGAIN
  3630                              <1> ;;;RES_ER: MOV	SI,OFFSET F1791 	; INDICATE DISK 1 ERROR
  3631                              <1> ;;	;TEST	DL,1
  3632                              <1> ;;	;JNZ	short RES_E1
  3633                              <1> ;;	;MOV	SI,OFFSET F1790 	; INDICATE DISK 0 ERROR
  3634                              <1> ;;;RES_E1:
  3635                              <1> ;;	;CALL	E_MSG			; DISPLAY ERROR AND SET (BP) ERROR FLAG
  3636                              <1> ;;;RES_OK:
  3637                              <1> ;;	;POP	CX			; RESTORE TIMER LIMITS
  3638                              <1> ;;	;POP	BX
  3639                              <1> ;;	;RETn
  3640                              <1> ;
  3641                              <1> ;;SET_FAIL:
  3642                              <1> ;	;MOV	AX,X*(CMOS_DIAG+NMI)	; GET CMOS ERROR BYTE
  3643                              <1> ;	;CALL	CMOS_READ
  3644                              <1> ;	;OR	AL,HF_FAIL		; SET DO NOT IPL FROM DISK FLAG
  3645                              <1> ;	;XCHG	AH,AL			; SAVE IT
  3646                              <1> ;	;CALL	CMOS_WRITE		; PUT IT OUT
  3647                              <1> ;	;RETn
  3648                              <1> ;
  3649                              <1> ;;POD_TCHK:				; CHECK FOR 30 SECOND TIME OUT
  3650                              <1> ;	;POP	AX			; SAVE RETURN
  3651                              <1> ;	;POP	CX			; GET TIME OUT LIMITS
  3652                              <1> ;	;POP	BX
  3653                              <1> ;	;PUSH	BX			; AND SAVE THEM AGAIN
  3654                              <1> ;	;PUSH	CX
  3655                              <1> ;	;PUSH	AX
  3656                              <1> ;	;push	ds
  3657                              <1> ;	;xor	ax, ax
  3658                              <1> ;	;mov	ds, ax			; RESTORE RETURN
  3659                              <1> ;	;MOV	AX, [TIMER_LOW]		; AX = CURRENT TIME
  3660                              <1> ;	;				; BX = START TIME
  3661                              <1> ;	;				; CX = END TIME
  3662                              <1> ;	;pop	ds
  3663                              <1> ;	;CMP	BX,CX
  3664                              <1> ;	;JB	short TCHK1		; START < END
  3665                              <1> ;	;CMP	BX,AX
  3666                              <1> ;	;JB	short TCHKG		; END < START < CURRENT
  3667                              <1> ;	;JMP	SHORT TCHK2		; END, CURRENT < START
  3668                              <1> ;;TCHK1: CMP	AX,BX
  3669                              <1> ;;	JB	short TCHKNG		; CURRENT < START < END
  3670                              <1> ;;TCHK2: CMP	AX,CX
  3671                              <1> ;;	JB	short TCHKG		; START < CURRENT < END
  3672                              <1> ;;					; OR CURRENT < END < START
  3673                              <1> ;;TCHKNG: STC				; CARRY SET INDICATES TIME OUT
  3674                              <1> ;;	RETn
  3675                              <1> ;;TCHKG: CLC				; INDICATE STILL TIME
  3676                              <1> ;;	RETn
  3677                              <1> ;;
  3678                              <1> ;;int_13h:
  3679                              <1> 
  3680                              <1> ;----------------------------------------
  3681                              <1> ;	FIXED DISK BIOS ENTRY POINT	:
  3682                              <1> ;----------------------------------------
  3683                              <1> 
  3684                              <1> ; 15/01/2017
  3685                              <1> ; 14/01/2017
  3686                              <1> ; 07/01/2017
  3687                              <1> ; 02/01/2017
  3688                              <1> ; 01/06/2016
  3689                              <1> ; 16/05/2016, 27/05/2016, 28/05/2016, 29/05/2016
  3690                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  3691                              <1> int33h:  ; DISK I/O
  3692                              <1> 	; 29/05/2016
  3693 00004266 80642408FE          <1> 	and	byte [esp+8], 11111110b  ; clear carry bit of eflags register
  3694                              <1> 	; 16/05/2016
  3695 0000426B 1E                  <1> 	push	ds
  3696 0000426C 53                  <1> 	push	ebx ; user's buffer address (virtual)
  3697 0000426D 66BB1000            <1> 	mov	bx, KDATA ; System (Kernel's) data segment
  3698 00004271 8EDB                <1> 	mov	ds, bx
  3699                              <1> 
  3700                              <1> 	;;15/01/2017
  3701                              <1> 	; 14/01/2017
  3702                              <1> 	; 02/01/2017
  3703                              <1> 	;;mov	byte [intflg], 33h	; disk io interrupt 
  3704                              <1> 	;pop	ebx
  3705                              <1> 	;mov	[user_buffer], ebx		
  3706                              <1> 
  3707 00004273 8F05[704F0100]      <1> 	pop	dword [user_buffer] ; 01/06/2016
  3708                              <1> 
  3709 00004279 C605[A6480100]00    <1> 	mov	byte [scount], 0 ; sector count for transfer
  3710 00004280 80FC03              <1> 	cmp	ah, 03h ; chs write
  3711 00004283 7744                <1> 	ja	short int33h_2
  3712 00004285 7407                <1> 	je	short int33h_0
  3713 00004287 80FC02              <1> 	cmp	ah, 02h ; chs read
  3714 0000428A 726A                <1> 	jb	short int33h_5
  3715 0000428C EB63                <1> 	jmp	short int33h_4
  3716                              <1> int33h_0:
  3717                              <1> 	; transfer user's buffer content to sector buffer
  3718 0000428E 51                  <1> 	push	ecx
  3719 0000428F 0FB6C8              <1> 	movzx	ecx, al
  3720                              <1> int33h_1:
  3721 00004292 56                  <1> 	push	esi
  3722 00004293 8B35[704F0100]      <1> 	mov	esi, [user_buffer]
  3723                              <1> 	; esi = user's buffer address (virtual, ebx)
  3724 00004299 57                  <1> 	push	edi
  3725 0000429A 06                  <1> 	push	es
  3726 0000429B 50                  <1> 	push	eax
  3727 0000429C 66B81000            <1> 	mov	ax, KDATA
  3728 000042A0 8EC0                <1> 	mov	es, ax
  3729 000042A2 BF00000700          <1> 	mov	edi, Cluster_Buffer
  3730 000042A7 C1E109              <1> 	shl	ecx, 9 ; * 512
  3731 000042AA E867A50000          <1> 	call	transfer_from_user_buffer
  3732 000042AF 58                  <1> 	pop	eax
  3733 000042B0 07                  <1> 	pop	es
  3734 000042B1 5F                  <1> 	pop	edi
  3735 000042B2 5E                  <1> 	pop	esi
  3736 000042B3 59                  <1> 	pop	ecx
  3737 000042B4 7340                <1> 	jnc	short int33h_5
  3738 000042B6 8B1D[704F0100]      <1> 	mov	ebx, [user_buffer] ; 01/06/2016
  3739 000042BC 1F                  <1> 	pop	ds
  3740                              <1> 
  3741                              <1> 	;;15/01/2017
  3742                              <1> 	; 02/01/2017
  3743                              <1> 	;cli
  3744                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
  3745                              <1> 	;
  3746                              <1> 	; (*) 29/05/2016
  3747                              <1> 	; (*) retf 4 ; skip eflags on stack
  3748                              <1> 
  3749                              <1> 	; 29/05/2016 -set carry flag on stack-
  3750                              <1> 	; [esp] = EIP
  3751                              <1> 	; [esp+4] = CS
  3752                              <1> 	; [esp+8] = E-FLAGS
  3753 000042BD 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
  3754                              <1> 	; [esp+12] = ESP (user)
  3755                              <1> 	; [esp+16] = SS (User)
  3756 000042C2 B8FF000000          <1> 	mov	eax, 0FFh ; Unknown error !?
  3757                              <1> 	;iretd
  3758 000042C7 EB79                <1> 	jmp	short int33h_7  ; 07/01/2017	
  3759                              <1> 
  3760                              <1> 	; (*) 29/05/2016 - 'ref 4' intruction causes to stack fault
  3761                              <1> 	; (OUTER-PRIVILEGE-LEVEL)
  3762                              <1> 	; INTEL 80386 PROGRAMMER'S REFERENCE MANUAL 1986
  3763                              <1> 	; // RETF instruction:
  3764                              <1> 	;
  3765                              <1> 	; IF OperandMode=32 THEN
  3766                              <1>  	;    Load CS:EIP from stack;
  3767                              <1>  	;    Set CS RPL to CPL;
  3768                              <1>  	;    Increment eSP by 8 plus the immediate offset if it exists;
  3769                              <1>  	;    Load SS:eSP from stack;
  3770                              <1>  	; ELSE (* OperandMode=16 *)
  3771                              <1>  	;    Load CS:IP from stack;
  3772                              <1>  	;    Set CS RPL to CPL;
  3773                              <1>  	;    Increment eSP by 4 plus the immediate offset if it exists;
  3774                              <1> 	;    Load SS:eSP from stack;
  3775                              <1>  	; FI;
  3776                              <1> 	;
  3777                              <1> 	; //
  3778                              <1> 
  3779                              <1> int33h_2:
  3780 000042C9 80FC05              <1> 	cmp	ah, 05h ; format track
  3781 000042CC 770A                <1> 	ja	short int33h_3
  3782 000042CE 7226                <1> 	jb	short int33h_5
  3783 000042D0 51                  <1> 	push	ecx
  3784 000042D1 B901000000          <1> 	mov	ecx, 1
  3785 000042D6 EBBA                <1> 	jmp	short int33h_1
  3786                              <1> int33h_3:
  3787 000042D8 80FC1C              <1> 	cmp	ah, 1Ch ; LBA write
  3788 000042DB 7719                <1> 	ja	short int33h_5
  3789 000042DD 74AF                <1> 	je	short int33h_0
  3790 000042DF 80FC1B              <1> 	cmp	ah, 1Bh ; LBA read
  3791 000042E2 740D                <1> 	je	short int33h_4
  3792 000042E4 80FC08              <1> 	cmp	ah, 08h ; get disk parameters
  3793 000042E7 750D                <1> 	jne	short int33h_5
  3794                              <1> 	; 01/06/2016
  3795 000042E9 8B1D[704F0100]      <1> 	mov	ebx, [user_buffer] ; user's buffer address
  3796 000042EF EB0A                <1> 	jmp	short int33h_6
  3797                              <1> int33h_4:
  3798 000042F1 A2[A6480100]        <1> 	mov	byte [scount], al ; <= 128 sectors
  3799                              <1> int33h_5:
  3800 000042F6 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; max. 65536 bytes
  3801                              <1> 				    ; buf. addr: 70000h	
  3802                              <1> 	;mov	byte [ClusterBuffer_Valid], 0
  3803                              <1> int33h_6:
  3804 000042FB 1F                  <1> 	pop	ds
  3805 000042FC 9C                  <1> 	pushfd
  3806 000042FD 0E                  <1> 	push 	cs
  3807 000042FE E84D000000          <1> 	call 	DISK_IO
  3808 00004303 2E8B1D[704F0100]    <1> 	mov	ebx, [CS:user_buffer] ; 01/06/2016
  3809 0000430A 723D                <1> 	jc	short int33h_9
  3810                              <1> 	;
  3811 0000430C 2E803D[A6480100]00  <1> 	cmp	byte [CS:scount], 0
  3812 00004314 762C                <1> 	jna	short int33h_7
  3813                              <1> 	; transfer sector buffer content to user's buffer
  3814 00004316 06                  <1> 	push	es
  3815 00004317 1E                  <1> 	push	ds
  3816 00004318 50                  <1> 	push	eax
  3817 00004319 66B81000            <1> 	mov	ax, KDATA
  3818 0000431D 8ED8                <1> 	mov	ds, ax
  3819 0000431F 8EC0                <1> 	mov	es, ax
  3820 00004321 51                  <1> 	push	ecx
  3821 00004322 56                  <1> 	push	esi
  3822 00004323 57                  <1> 	push	edi
  3823 00004324 0FB60D[A6480100]    <1> 	movzx	ecx, byte [scount]
  3824 0000432B C1E109              <1> 	shl	ecx, 9 ; * 512 bytes
  3825 0000432E 89DF                <1> 	mov	edi, ebx ; user's buffer address
  3826 00004330 BE00000700          <1> 	mov	esi, Cluster_Buffer
  3827 00004335 E892A40000          <1> 	call	transfer_to_user_buffer
  3828 0000433A 5F                  <1> 	pop	edi
  3829 0000433B 5E                  <1> 	pop	esi
  3830 0000433C 59                  <1> 	pop	ecx
  3831 0000433D 58                  <1> 	pop	eax
  3832 0000433E 1F                  <1> 	pop	ds
  3833 0000433F 07                  <1> 	pop	es
  3834 00004340 7202                <1> 	jc	short int33h_8
  3835                              <1> int33h_7:
  3836 00004342 FA                  <1> 	cli
  3837                              <1> 	;;15/01/2017
  3838                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
  3839                              <1> 	; cf = 0  ; use eflags which is in stack
  3840 00004343 CF                  <1> 	iretd	
  3841                              <1> int33h_8:
  3842 00004344 B8FF000000          <1> 	mov	eax, 0FFh ; Unknown error !?
  3843                              <1> int33h_9:
  3844                              <1> 	; cf = 1
  3845                              <1> 
  3846                              <1> 	; (*) 29/05/2016	
  3847                              <1> 	; (*) retf 4 ; skip eflags on stack
  3848                              <1> 	; Note: This 'retf 4' was wrong, -it was causing
  3849                              <1> 	;       to stack errors in ring 3-
  3850                              <1> 	;	POP sequence of 'retf 4' is as
  3851                              <1> 	;       "eip, cs, eflags, esp, ss, +4 bytes" 
  3852                              <1>         ;       it is not as "eip, cs, +4 bytes, esp, ss" ! 
  3853                              <1> 
  3854                              <1> 	; 29/05/2016 -set carry flag on stack-
  3855 00004349 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
  3856                              <1> 	;iretd
  3857 0000434E EBF2                <1> 	jmp	short int33h_7 ; 07/01/2017
  3858                              <1> 
  3859                              <1> ; 29/05/2016
  3860                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  3861                              <1> 
  3862                              <1> DISK_IO:
  3863 00004350 80FA80              <1> 	CMP	DL,80H			; TEST FOR FIXED DISK DRIVE
  3864                              <1> 	;JAE	short A1		; YES, HANDLE HERE
  3865                              <1> 	;;;INT	40H			; DISKETTE HANDLER
  3866                              <1> 	;;call	int40h
  3867 00004353 0F8222F0FFFF        <1> 	jb	DISKETTE_IO_1
  3868                              <1> ;RET_2:
  3869                              <1> 	;RETf	2			; BACK TO CALLER
  3870                              <1> ;	retf	4
  3871                              <1> A1:
  3872 00004359 FB                  <1> 	STI				; ENABLE INTERRUPTS
  3873                              <1> 	;; 04/01/2015
  3874                              <1> 	;;OR	AH,AH
  3875                              <1> 	;;JNZ	short A2
  3876                              <1> 	;;INT	40H			; RESET NEC WHEN AH=0
  3877                              <1> 	;;SUB	AH,AH
  3878 0000435A 80FA83              <1> 	CMP	DL,(80H + S_MAX_FILE - 1)
  3879                              <1> 	;JA	short RET_2
  3880 0000435D 7616                <1> 	jna	short _A0
  3881                              <1> 	; 29/05/2016
  3882 0000435F 1E                  <1> 	push	ds
  3883 00004360 6650                <1> 	push	ax
  3884 00004362 66B81000            <1> 	mov	ax, KDATA
  3885 00004366 8ED8                <1> 	mov	ds, ax
  3886 00004368 6658                <1> 	pop	ax
  3887 0000436A B4AA                <1>         mov     ah, 0AAh        ; Hard disk drive not ready !
  3888                              <1> 				; (Programmer's guide to AMIBIOS, 1992)
  3889 0000436C 8825[7B420100]      <1> 	mov     byte [DISK_STATUS1], ah
  3890 00004372 1F                  <1> 	pop	ds
  3891 00004373 EB38                <1> 	jmp	short RET_2
  3892                              <1> _A0:
  3893                              <1> 	; 18/01/2015
  3894 00004375 08E4                <1> 	or	ah,ah
  3895 00004377 743A                <1> 	jz	short A4
  3896 00004379 80FC0D              <1> 	cmp	ah, 0Dh	; Alternate reset
  3897 0000437C 7504                <1> 	jne	short A2
  3898 0000437E 28E4                <1> 	sub	ah,ah	; Reset
  3899 00004380 EB31                <1> 	jmp	short A4
  3900                              <1> A2:
  3901 00004382 80FC08              <1> 	CMP	AH,08H			; GET PARAMETERS IS A SPECIAL CASE
  3902                              <1> 	;JNZ	short A3
  3903                              <1>         ;JMP    GET_PARM_N
  3904 00004385 0F8431030000        <1> 	je	GET_PARM_N
  3905 0000438B 80FC15              <1> A3:	CMP	AH,15H			; READ DASD TYPE IS ALSO
  3906                              <1> 	;JNZ	short A4
  3907                              <1>         ;JMP    READ_DASD_TYPE
  3908 0000438E 0F84DA020000        <1>         je      READ_DASD_TYPE
  3909                              <1> 	; 02/02/2015
  3910 00004394 80FC1D              <1> 	cmp	ah, 1Dh			;(Temporary for Retro UNIX 386 v1)
  3911                              <1> 	; 12/01/2015
  3912 00004397 F5                  <1> 	cmc
  3913 00004398 7319                <1> 	jnc	short A4
  3914                              <1> int33h_bad_cmd:
  3915                              <1> 	; 16/05/2016
  3916                              <1> 	; 30/01/2015
  3917                              <1> 	; 29/05/2016
  3918 0000439A 1E                  <1> 	push	ds
  3919 0000439B 6650                <1> 	push	ax
  3920 0000439D 66B81000            <1> 	mov	ax, KDATA
  3921 000043A1 8ED8                <1> 	mov	ds, ax
  3922 000043A3 6658                <1> 	pop	ax
  3923 000043A5 B401                <1> 	mov	ah, BAD_CMD
  3924 000043A7 8825[7B420100]      <1> 	mov     [DISK_STATUS1], ah ; BAD_CMD  ; COMMAND ERROR
  3925                              <1>         ;jmp	short RET_2
  3926                              <1> RET_2:
  3927                              <1> 	; (*) 29/05/2016
  3928                              <1> 	; (*) retf 4
  3929 000043AD 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  3930 000043B2 CF                  <1> 	iretd
  3931                              <1> A4:					; SAVE REGISTERS DURING OPERATION
  3932 000043B3 C8080000            <1> 	ENTER	8,0			; SAVE (BP) AND MAKE ROOM FOR @CMD_BLOCK
  3933 000043B7 53                  <1> 	PUSH	eBX			;  IN THE STACK, THE COMMAND BLOCK IS:
  3934 000043B8 51                  <1> 	PUSH	eCX			;   @CMD_BLOCK == BYTE PTR [BP]-8
  3935 000043B9 52                  <1> 	PUSH	eDX
  3936 000043BA 1E                  <1> 	PUSH	DS
  3937 000043BB 06                  <1> 	PUSH	ES
  3938 000043BC 56                  <1> 	PUSH	eSI
  3939 000043BD 57                  <1> 	PUSH	eDI
  3940                              <1> 	;;04/01/2015
  3941                              <1> 	;;OR	AH,AH			; CHECK FOR RESET
  3942                              <1> 	;;JNZ	short A5
  3943                              <1> 	;;MOV	DL,80H			; FORCE DRIVE 80 FOR RESET
  3944                              <1> ;;A5:	
  3945                              <1> 	;push	cs
  3946                              <1> 	;pop	ds
  3947                              <1> 	; 21/02/2015
  3948 000043BE 6650                <1> 	push	ax
  3949 000043C0 66B81000            <1> 	mov	ax, KDATA
  3950 000043C4 8ED8                <1> 	mov	ds, ax
  3951 000043C6 8EC0                <1> 	mov	es, ax	
  3952 000043C8 6658                <1> 	pop	ax
  3953 000043CA E88D000000          <1> 	CALL	DISK_IO_CONT		; PERFORM THE OPERATION
  3954                              <1> 	;;CALL	DDS			; ESTABLISH SEGMENT
  3955 000043CF 8A25[7B420100]      <1> 	MOV	AH,[DISK_STATUS1]	; GET STATUS FROM OPERATION
  3956                              <1> 	;(*) CMP AH,1			; SET THE CARRY FLAG TO INDICATE
  3957                              <1> 	;(*) CMC			; SUCCESS OR FAILURE
  3958 000043D5 5F                  <1> 	POP	eDI			; RESTORE REGISTERS
  3959 000043D6 5E                  <1> 	POP	eSI
  3960 000043D7 07                  <1>         POP     ES
  3961 000043D8 1F                  <1>         POP     DS
  3962 000043D9 5A                  <1> 	POP	eDX
  3963 000043DA 59                  <1> 	POP	eCX
  3964 000043DB 5B                  <1> 	POP	eBX
  3965 000043DC C9                  <1> 	LEAVE				; ADJUST (SP) AND RESTORE (BP)
  3966                              <1> 	;RETf	2			; THROW AWAY SAVED FLAGS
  3967                              <1> 	; (*) 29/05/2016
  3968                              <1> 	; (*) retf 4
  3969 000043DD 80FC01              <1> 	cmp	ah, 1
  3970 000043E0 7205                <1> 	jc	short _A5 
  3971 000043E2 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  3972                              <1> _A5:
  3973 000043E7 CF                  <1> 	iretd
  3974                              <1> 
  3975                              <1> ; 21/02/2015
  3976                              <1> ;       dw --> dd
  3977                              <1> D1:					; FUNCTION TRANSFER TABLE
  3978 000043E8 [AA450000]          <1> 	dd	DISK_RESET		; 000H
  3979 000043EC [21460000]          <1> 	dd	RETURN_STATUS		; 001H
  3980 000043F0 [2E460000]          <1> 	dd	DISK_READ		; 002H
  3981 000043F4 [37460000]          <1> 	dd	DISK_WRITE		; 003H
  3982 000043F8 [40460000]          <1> 	dd	DISK_VERF		; 004H
  3983 000043FC [58460000]          <1> 	dd	FMT_TRK 		; 005H
  3984 00004400 [A0450000]          <1> 	dd	BAD_COMMAND		; 006H	FORMAT BAD SECTORS
  3985 00004404 [A0450000]          <1> 	dd	BAD_COMMAND		; 007H	FORMAT DRIVE
  3986 00004408 [A0450000]          <1> 	dd	BAD_COMMAND		; 008H	RETURN PARAMETERS
  3987 0000440C [43470000]          <1> 	dd	INIT_DRV		; 009H
  3988 00004410 [A2470000]          <1> 	dd	RD_LONG 		; 00AH
  3989 00004414 [AB470000]          <1> 	dd	WR_LONG 		; 00BH
  3990 00004418 [B4470000]          <1> 	dd	DISK_SEEK		; 00CH
  3991 0000441C [AA450000]          <1> 	dd	DISK_RESET		; 00DH
  3992 00004420 [A0450000]          <1> 	dd	BAD_COMMAND		; 00EH	READ BUFFER
  3993 00004424 [A0450000]          <1> 	dd	BAD_COMMAND		; 00FH	WRITE BUFFER
  3994 00004428 [DC470000]          <1> 	dd	TST_RDY 		; 010H
  3995 0000442C [00480000]          <1> 	dd	HDISK_RECAL		; 011H
  3996 00004430 [A0450000]          <1> 	dd	BAD_COMMAND		; 012H	MEMORY DIAGNOSTIC
  3997 00004434 [A0450000]          <1> 	dd	BAD_COMMAND		; 013H	DRIVE DIAGNOSTIC
  3998 00004438 [36480000]          <1> 	dd	CTLR_DIAGNOSTIC 	; 014H	CONTROLLER DIAGNOSTIC
  3999                              <1> 	; 02/02/2015 (Temporary - Retro UNIX 386 v1 - DISK I/O test)
  4000 0000443C [A0450000]          <1> 	dd	BAD_COMMAND		; 015h
  4001 00004440 [A0450000]          <1> 	dd	BAD_COMMAND		; 016h
  4002 00004444 [A0450000]          <1> 	dd	BAD_COMMAND		; 017h
  4003 00004448 [A0450000]          <1> 	dd	BAD_COMMAND		; 018h
  4004 0000444C [A0450000]          <1> 	dd	BAD_COMMAND		; 019h
  4005 00004450 [A0450000]          <1> 	dd	BAD_COMMAND		; 01Ah
  4006 00004454 [2E460000]          <1> 	dd	DISK_READ		; 01Bh ; LBA read
  4007 00004458 [37460000]          <1> 	dd	DISK_WRITE		; 01Ch ; LBA write
  4008                              <1> D1L     EQU    $ - D1
  4009                              <1> 
  4010                              <1> DISK_IO_CONT:
  4011                              <1> 	;;CALL	DDS			; ESTABLISH SEGMENT
  4012 0000445C 80FC01              <1> 	CMP	AH,01H			; RETURN STATUS
  4013                              <1> 	;;JNZ	short SU0
  4014                              <1>         ;;JMP    RETURN_STATUS
  4015 0000445F 0F84BC010000        <1> 	je	RETURN_STATUS
  4016                              <1> SU0:
  4017 00004465 C605[7B420100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; RESET THE STATUS INDICATOR
  4018                              <1> 	;;PUSH	BX			; SAVE DATA ADDRESS
  4019                              <1> 	;mov	si, bx ;; 14/02/2015
  4020 0000446C 89DE                <1> 	mov	esi, ebx ; 21/02/2015
  4021 0000446E 8A1D[7C420100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4022                              <1> 	;; 04/01/2015
  4023                              <1> 	;;PUSH	AX
  4024 00004474 80E27F              <1> 	AND	DL,7FH			; GET DRIVE AS 0 OR 1
  4025                              <1> 					; (get drive number as 0 to 3)
  4026 00004477 38D3                <1> 	CMP	BL,DL
  4027                              <1>         ;;JBE   BAD_COMMAND_POP         ; INVALID DRIVE
  4028 00004479 0F8621010000        <1>         jbe     BAD_COMMAND ;; 14/02/2015
  4029                              <1>         ;
  4030                              <1> 	;;03/01/2015
  4031 0000447F 29DB                <1> 	sub	ebx, ebx
  4032 00004481 88D3                <1> 	mov	bl, dl
  4033                              <1> 	;sub	bh, bh
  4034 00004483 883D[90420100]      <1> 	mov	[LBAMode], bh 	; 0
  4035                              <1> 	;;test	byte [bx+hd0_type], 1	; LBA ready ?
  4036                              <1> 	;test	byte [ebx+hd0_type], 1
  4037                              <1> 	;jz	short su1		; no
  4038                              <1> 	;inc	byte [LBAMode]
  4039                              <1> ;su1:
  4040                              <1> 	; 21/02/2015 (32 bit modification)
  4041                              <1> 	;04/01/2015
  4042 00004489 6650                <1> 	push	ax ; ***
  4043                              <1> 	;PUSH	ES ; **
  4044 0000448B 6652                <1> 	PUSH	DX ; *
  4045 0000448D 6650                <1> 	push	ax
  4046 0000448F E888060000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS
  4047                              <1> 	; 02/02/2015
  4048                              <1> 	;mov	ax, [ES:BX+16] ; I/O port base address (1F0h, 170h)
  4049 00004494 668B4310            <1> 	mov	ax, [ebx+16]
  4050 00004498 66A3[485C0000]      <1> 	mov	[HF_PORT], ax
  4051                              <1> 	;mov	dx, [ES:BX+18] ; control port address (3F6h, 376h)
  4052 0000449E 668B5312            <1> 	mov	dx, [ebx+18]
  4053 000044A2 668915[4A5C0000]    <1> 	mov	[HF_REG_PORT], dx
  4054                              <1> 	;mov	al, [ES:BX+20] ; head register upper nibble (A0h,B0h,E0h,F0h)
  4055 000044A9 8A4314              <1> 	mov	al, [ebx+20]
  4056                              <1> 	; 23/02/2015
  4057 000044AC A840                <1> 	test	al, 40h	 ; LBA bit (bit 6)
  4058 000044AE 7406                <1> 	jz 	short su1
  4059 000044B0 FE05[90420100]      <1> 	inc	byte [LBAMode] ; 1 
  4060                              <1> su1: 	 
  4061 000044B6 C0E804              <1> 	shr 	al, 4
  4062 000044B9 2401                <1> 	and	al, 1			
  4063 000044BB A2[4C5C0000]        <1> 	mov	[hf_m_s], al 
  4064                              <1> 	;
  4065                              <1> 	; 03/01/2015
  4066                              <1> 	;MOV	AL,byte [ES:BX+8]	; GET CONTROL BYTE MODIFIER
  4067 000044C0 8A4308              <1> 	mov	al, [ebx+8]
  4068                              <1> 	;MOV	DX,[HF_REG_PORT]	; Device Control register	
  4069 000044C3 EE                  <1> 	OUT	DX,AL			; SET EXTRA HEAD OPTION
  4070                              <1> 					; Control Byte:  (= 08h, here)
  4071                              <1> 					; bit 0 - 0
  4072                              <1> 					; bit 1 - nIEN (1 = disable irq)
  4073                              <1> 					; bit 2 - SRST (software RESET)
  4074                              <1> 					; bit 3 - use extra heads (8 to 15)
  4075                              <1> 					;         -always set to 1-	
  4076                              <1> 					; (bits 3 to 7 are reserved
  4077                              <1> 					;          for ATA devices)
  4078 000044C4 8A25[7D420100]      <1> 	MOV	AH,[CONTROL_BYTE]	; SET EXTRA HEAD OPTION IN
  4079 000044CA 80E4C0              <1> 	AND	AH,0C0H 		; CONTROL BYTE
  4080 000044CD 08C4                <1> 	OR	AH,AL
  4081 000044CF 8825[7D420100]      <1> 	MOV	[CONTROL_BYTE],AH	
  4082                              <1> 	; 04/01/2015
  4083 000044D5 6658                <1> 	pop	ax
  4084 000044D7 665A                <1> 	pop	dx ; * ;; 14/02/2015
  4085 000044D9 20E4                <1> 	and	ah, ah	; Reset function ?
  4086 000044DB 7507                <1> 	jnz	short su2
  4087                              <1> 	;;pop	dx ; * ;; 14/02/2015
  4088                              <1> 	;pop	es ; **
  4089 000044DD 6658                <1> 	pop	ax ; ***
  4090                              <1> 	;;pop	bx
  4091 000044DF E9C6000000          <1>         jmp     DISK_RESET
  4092                              <1> su2:
  4093 000044E4 803D[90420100]00    <1> 	cmp	byte [LBAMode], 0
  4094 000044EB 7661                <1> 	jna	short su3
  4095                              <1> 	;
  4096                              <1> 	; 02/02/2015 (LBA read/write function calls)
  4097 000044ED 80FC1B              <1> 	cmp	ah, 1Bh
  4098 000044F0 720B                <1> 	jb	short lbarw1
  4099 000044F2 80FC1C              <1> 	cmp	ah, 1Ch
  4100 000044F5 775C                <1> 	ja 	short invldfnc
  4101                              <1> 	;;pop	dx ; * ; 14/02/2015
  4102                              <1> 	;mov	ax, cx ; Lower word of LBA address (bits 0-15)
  4103 000044F7 89C8                <1> 	mov	eax, ecx ; LBA address (21/02/2015)
  4104                              <1> 	;; 14/02/2015
  4105 000044F9 88D1                <1> 	mov	cl, dl ; 14/02/2015
  4106                              <1> 	;;mov	dx, bx
  4107                              <1> 	;mov	dx, si ; higher word of LBA address (bits 16-23)
  4108                              <1> 	;;mov	bx, di
  4109                              <1> 	;mov	si, di ; Buffer offset
  4110 000044FB EB31                <1> 	jmp	short lbarw2
  4111                              <1> lbarw1:
  4112                              <1> 	; convert CHS to LBA
  4113                              <1> 	;
  4114                              <1> 	; LBA calculation - AWARD BIOS - 1999 - AHDSK.ASM
  4115                              <1> 	; LBA = "# of Heads" * Sectors/Track * Cylinder + Head * Sectors/Track
  4116                              <1> 	;	+ Sector - 1
  4117 000044FD 6652                <1> 	push	dx ; * ;; 14/02/2015
  4118                              <1> 	;xor	dh, dh
  4119 000044FF 31D2                <1> 	xor	edx, edx
  4120                              <1> 	;mov	dl, [ES:BX+14]	; sectors per track (logical)
  4121 00004501 8A530E              <1> 	mov	dl, [ebx+14]
  4122                              <1> 	;xor	ah, ah
  4123 00004504 31C0                <1> 	xor	eax, eax
  4124                              <1> 	;mov	al, [ES:BX+2]	; heads (logical) 	
  4125 00004506 8A4302              <1> 	mov	al, [ebx+2]
  4126 00004509 FEC8                <1> 	dec	al
  4127 0000450B 6640                <1> 	inc	ax		; 0 =  256
  4128 0000450D 66F7E2              <1> 	mul 	dx
  4129                              <1> 		; AX = # of Heads" * Sectors/Track
  4130 00004510 6689CA              <1> 	mov	dx, cx
  4131                              <1> 	;and	cx, 3Fh	 ; sector  (1 to 63)
  4132 00004513 83E13F              <1> 	and	ecx, 3fh
  4133 00004516 86D6                <1> 	xchg	dl, dh
  4134 00004518 C0EE06              <1> 	shr	dh, 6
  4135                              <1> 		; DX = cylinder (0 to 1023)
  4136                              <1> 	;mul 	dx
  4137                              <1> 		; DX:AX = # of Heads" * Sectors/Track * Cylinder
  4138 0000451B F7E2                <1> 	mul	edx
  4139 0000451D FEC9                <1> 	dec	cl  ; sector - 1
  4140                              <1> 	;add	ax, cx
  4141                              <1> 	;adc	dx, 0
  4142                              <1> 		; DX:AX = # of Heads" * Sectors/Track * Cylinder + Sector -1
  4143 0000451F 01C8                <1> 	add	eax, ecx
  4144 00004521 6659                <1> 	pop	cx ; * ; ch = head, cl = drive number (zero based)
  4145                              <1> 	;push	dx
  4146                              <1> 	;push	ax
  4147 00004523 50                  <1> 	push	eax
  4148                              <1> 	;mov	al, [ES:BX+14]	; sectors per track (logical)	
  4149 00004524 8A430E              <1> 	mov	al, [ebx+14]
  4150 00004527 F6E5                <1> 	mul	ch
  4151                              <1> 		;  AX = Head * Sectors/Track
  4152 00004529 6699                <1>         cwd
  4153                              <1> 	;pop	dx
  4154 0000452B 5A                  <1> 	pop	edx
  4155                              <1> 	;add	ax, dx
  4156                              <1> 	;pop	dx
  4157                              <1> 	;adc	dx, 0 ; add carry bit
  4158 0000452C 01D0                <1> 	add	eax, edx
  4159                              <1> lbarw2:
  4160 0000452E 29D2                <1> 	sub	edx, edx ; 21/02/2015
  4161 00004530 88CA                <1> 	mov	dl, cl ; 21/02/2015
  4162 00004532 C645F800            <1>         mov     byte [CMD_BLOCK], 0 ; Features Register
  4163                              <1> 				; NOTE: Features register (1F1h, 171h)
  4164                              <1> 				; is not used for ATA device R/W functions. 
  4165                              <1> 				; It is old/obsolete 'write precompensation'
  4166                              <1> 				; register and error register
  4167                              <1> 				; for old ATA/IDE devices.
  4168                              <1> 	; 18/01/2014
  4169                              <1> 	;mov	ch, [hf_m_s]	; Drive 0 (master) or 1 (slave)
  4170 00004536 8A0D[4C5C0000]      <1> 	mov	cl, [hf_m_s]
  4171                              <1> 	;shl	ch, 4		; bit 4 (drive bit)
  4172                              <1> 	;or	ch, 0E0h	; bit 5 = 1
  4173                              <1> 				; bit 6 = 1 = LBA mode
  4174                              <1> 				; bit 7 = 1
  4175 0000453C 80C90E              <1> 	or	cl, 0Eh ; 1110b
  4176                              <1> 	;and	dh, 0Fh		; LBA byte 4 (bits 24 to 27)
  4177 0000453F 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh
  4178 00004544 C1E11C              <1> 	shl	ecx, 28 ; 21/02/2015
  4179                              <1> 	;or	dh, ch
  4180 00004547 09C8                <1> 	or	eax, ecx	
  4181                              <1> 	;;mov	[CMD_BLOCK+2], al ; LBA byte 1 (bits 0 to 7)
  4182                              <1> 				  ; (Sector Number Register)
  4183                              <1> 	;;mov	[CMD_BLOCK+3], ah ; LBA byte 2 (bits 8 to 15)
  4184                              <1> 				  ; (Cylinder Low Register)
  4185                              <1> 	;mov	[CMD_BLOCK+2], ax ; LBA byte 1, 2
  4186                              <1> 	;mov	[CMD_BLOCK+4], dl ; LBA byte 3 (bits 16 to 23)
  4187                              <1> 				  ; (Cylinder High Register)
  4188                              <1> 	;;mov	[CMD_BLOCK+5], dh ; LBA byte 4 (bits 24 to 27)
  4189                              <1> 				  ; (Drive/Head Register)
  4190                              <1> 	
  4191                              <1> 	;mov	[CMD_BLOCK+4], dx ; LBA byte 4, LBA & DEV select bits
  4192 00004549 8945FA              <1> 	mov	[CMD_BLOCK+2], eax ; 21/02/2015
  4193                              <1> 	;14/02/2015
  4194                              <1> 	;mov	dl, cl ; Drive number (INIT_DRV)		
  4195 0000454C EB38                <1> 	jmp	short su4
  4196                              <1> su3:
  4197                              <1> 	; 02/02/2015 
  4198                              <1> 	; (Temporary functions 1Bh & 1Ch are not valid for CHS mode) 
  4199 0000454E 80FC14              <1> 	cmp 	ah, 14h
  4200 00004551 7604                <1> 	jna 	short chsfnc
  4201                              <1> invldfnc:
  4202                              <1>         ; 14/02/2015  
  4203                              <1> 	;pop	es ; **
  4204 00004553 6658                <1>         pop     ax ; ***
  4205                              <1>         ;jmp     short BAD_COMMAND_POP
  4206 00004555 EB49                <1>         jmp     short BAD_COMMAND
  4207                              <1> chsfnc:	
  4208                              <1> 	;MOV	AX,[ES:BX+5]		; GET WRITE PRE-COMPENSATION CYLINDER
  4209 00004557 668B4305            <1> 	mov	ax, [ebx+5]
  4210 0000455B 66C1E802            <1> 	SHR	AX,2
  4211 0000455F 8845F8              <1> 	MOV	[CMD_BLOCK],AL
  4212                              <1> 	;;MOV	AL,[ES:BX+8]		; GET CONTROL BYTE MODIFIER
  4213                              <1> 	;;PUSH	DX
  4214                              <1> 	;;MOV	DX,[HF_REG_PORT]
  4215                              <1> 	;;OUT	DX,AL			; SET EXTRA HEAD OPTION
  4216                              <1> 	;;POP	DX ; * 
  4217                              <1> 	;;POP	ES ; **
  4218                              <1> 	;;MOV	AH,[CONTROL_BYTE]	; SET EXTRA HEAD OPTION IN
  4219                              <1> 	;;AND	AH,0C0H 		; CONTROL BYTE	
  4220                              <1> 	;;OR	AH,AL
  4221                              <1> 	;;MOV	[CONTROL_BYTE],AH
  4222                              <1> 	;
  4223 00004562 88C8                <1> 	MOV	AL,CL			; GET SECTOR NUMBER
  4224 00004564 243F                <1> 	AND	AL,3FH
  4225 00004566 8845FA              <1> 	MOV	[CMD_BLOCK+2],AL
  4226 00004569 886DFB              <1> 	MOV	[CMD_BLOCK+3],CH 	; GET CYLINDER NUMBER
  4227 0000456C 88C8                <1> 	MOV	AL,CL
  4228 0000456E C0E806              <1> 	SHR	AL,6
  4229 00004571 8845FC              <1> 	MOV	[CMD_BLOCK+4],AL 	; CYLINDER HIGH ORDER 2 BITS
  4230                              <1> 	;;05/01/2015
  4231                              <1> 	;;MOV	AL,DL			; DRIVE NUMBER
  4232 00004574 A0[4C5C0000]        <1> 	mov	al, [hf_m_s]
  4233 00004579 C0E004              <1> 	SHL	AL,4
  4234 0000457C 80E60F              <1> 	AND	DH,0FH			; HEAD NUMBER
  4235 0000457F 08F0                <1> 	OR	AL,DH
  4236                              <1> 	;OR	AL,80H or 20H
  4237 00004581 0CA0                <1> 	OR	AL,80h+20h		; ECC AND 512 BYTE SECTORS
  4238 00004583 8845FD              <1> 	MOV	[CMD_BLOCK+5],AL 	; ECC/SIZE/DRIVE/HEAD
  4239                              <1> su4:
  4240                              <1> 	;POP	ES ; **
  4241                              <1>         ;; 14/02/2015
  4242                              <1>         ;;POP   AX
  4243                              <1>         ;;MOV   [CMD_BLOCK+1],AL        ; SECTOR COUNT
  4244                              <1>         ;;PUSH  AX
  4245                              <1>         ;;MOV   AL,AH                   ; GET INTO LOW BYTE
  4246                              <1>         ;;XOR   AH,AH                   ; ZERO HIGH BYTE
  4247                              <1>         ;;SAL   AX,1                    ; *2 FOR TABLE LOOKUP
  4248 00004586 6658                <1>         pop     ax ; ***
  4249 00004588 8845F9              <1>         mov     [CMD_BLOCK+1], al
  4250 0000458B 29DB                <1>         sub	ebx, ebx
  4251 0000458D 88E3                <1> 	mov     bl, ah
  4252                              <1>         ;xor     bh, bh
  4253                              <1>         ;sal     bx, 1
  4254 0000458F 66C1E302            <1>         sal	bx, 2	; 32 bit offset (21/02/2015)
  4255                              <1> 	;;MOV   SI,AX                   ; PUT INTO SI FOR BRANCH
  4256                              <1>         ;;CMP   AX,D1L                  ; TEST WITHIN RANGE
  4257                              <1>         ;;JNB   short BAD_COMMAND_POP
  4258                              <1>         ;cmp     bx, D1L
  4259 00004593 83FB74              <1> 	cmp	ebx, D1L
  4260 00004596 7308                <1> 	jnb	short BAD_COMMAND
  4261                              <1>         ;xchg    bx, si
  4262 00004598 87DE                <1>         xchg	ebx, esi
  4263                              <1> 	;;;POP	AX			; RESTORE AX
  4264                              <1> 	;;;POP	BX			; AND DATA ADDRESS
  4265                              <1> 	
  4266                              <1> 	;;PUSH	CX
  4267                              <1> 	;;PUSH	AX			; ADJUST ES:BX
  4268                              <1> 	;MOV	CX,BX			; GET 3 HIGH ORDER NIBBLES OF BX
  4269                              <1> 	;SHR	CX,4
  4270                              <1> 	;MOV	AX,ES
  4271                              <1> 	;ADD	AX,CX
  4272                              <1> 	;MOV	ES,AX
  4273                              <1> 	;AND	BX,000FH		; ES:BX CHANGED TO ES:000X
  4274                              <1> 	;;POP	AX
  4275                              <1> 	;;POP	CX
  4276                              <1> 	;;JMP	word [CS:SI+D1]
  4277                              <1> 	;jmp	word [SI+D1]
  4278 0000459A FFA6[E8430000]      <1> 	jmp	dword [esi+D1]
  4279                              <1> ;;BAD_COMMAND_POP:
  4280                              <1> ;;	POP	AX
  4281                              <1> ;;	POP	BX
  4282                              <1> BAD_COMMAND:
  4283 000045A0 C605[7B420100]01    <1>         MOV     byte [DISK_STATUS1],BAD_CMD  ; COMMAND ERROR
  4284 000045A7 B000                <1> 	MOV	AL,0
  4285 000045A9 C3                  <1> 	RETn
  4286                              <1> 
  4287                              <1> ;----------------------------------------
  4288                              <1> ;	RESET THE DISK SYSTEM  (AH=00H) :
  4289                              <1> ;----------------------------------------
  4290                              <1> 
  4291                              <1> ; 18-1-2015 : one controller reset (not other one)
  4292                              <1> 
  4293                              <1> DISK_RESET:
  4294 000045AA FA                  <1> 	CLI
  4295 000045AB E4A1                <1> 	IN	AL,INTB01		; GET THE MASK REGISTER
  4296                              <1> 	;JMP	$+2
  4297                              <1> 	IODELAY
  4297 000045AD EB00                <2>  jmp short $+2
  4297 000045AF EB00                <2>  jmp short $+2
  4298                              <1> 	;AND	AL,0BFH 		; ENABLE FIXED DISK INTERRUPT
  4299 000045B1 243F                <1> 	and	al,3Fh			; 22/12/2014 (IRQ 14 & IRQ 15)
  4300 000045B3 E6A1                <1> 	OUT	INTB01,AL
  4301 000045B5 FB                  <1> 	STI				; START INTERRUPTS
  4302                              <1> 	; 14/02/2015
  4303 000045B6 6689D7              <1> 	mov	di, dx	
  4304                              <1> 	; 04/01/2015
  4305                              <1> 	;xor	di,di
  4306                              <1> drst0:
  4307 000045B9 B004                <1> 	MOV	AL,04H  ; bit 2 - SRST 
  4308                              <1> 	;MOV	DX,HF_REG_PORT
  4309 000045BB 668B15[4A5C0000]    <1> 	MOV	DX,[HF_REG_PORT]
  4310 000045C2 EE                  <1> 	OUT	DX,AL			; RESET
  4311                              <1> ;	MOV	CX,10			; DELAY COUNT
  4312                              <1> ;DRD:	DEC	CX
  4313                              <1> ;	JNZ	short DRD		; WAIT 4.8 MICRO-SEC
  4314                              <1> 	;mov	cx,2			; wait for 30 micro seconds	
  4315 000045C3 B902000000          <1>         mov	ecx, 2 ; 21/02/2015
  4316 000045C8 E820D8FFFF          <1> 	call    WAITF                   ; (Award Bios 1999 - WAIT_REFRESH,
  4317                              <1>                                         ; 40 micro seconds)
  4318 000045CD A0[7D420100]        <1> 	mov	al,[CONTROL_BYTE]
  4319 000045D2 240F                <1> 	AND	AL,0FH			; SET HEAD OPTION
  4320 000045D4 EE                  <1> 	OUT	DX,AL			; TURN RESET OFF
  4321 000045D5 E838040000          <1> 	CALL	NOT_BUSY
  4322 000045DA 7515                <1> 	JNZ	short DRERR		; TIME OUT ON RESET
  4323 000045DC 668B15[485C0000]    <1> 	MOV	DX,[HF_PORT]
  4324 000045E3 FEC2                <1> 	inc	dl  ; HF_PORT+1
  4325                              <1> 	; 02/01/2015 - Award BIOS 1999 - AHDSK.ASM
  4326                              <1>         ;mov     cl, 10
  4327 000045E5 B90A000000          <1>         mov     ecx, 10 ; 21/02/2015 
  4328                              <1> drst1:
  4329 000045EA EC                  <1> 	IN	AL,DX			; GET RESET STATUS
  4330 000045EB 3C01                <1> 	CMP	AL,1
  4331                              <1> 	; 04/01/2015
  4332 000045ED 740A                <1> 	jz	short drst2
  4333                              <1> 	;JNZ	short DRERR		; BAD RESET STATUS
  4334                              <1>         	; Drive/Head Register - bit 4
  4335 000045EF E2F9                <1> 	loop	drst1
  4336                              <1> DRERR:	
  4337 000045F1 C605[7B420100]05    <1> 	MOV	byte [DISK_STATUS1],BAD_RESET ; CARD FAILED
  4338 000045F8 C3                  <1> 	RETn
  4339                              <1> drst2:
  4340                              <1> 	; 14/02/2015
  4341 000045F9 6689FA              <1> 	mov	dx,di
  4342                              <1> ;drst3:
  4343                              <1> ;	; 05/01/2015
  4344                              <1> ;	shl 	di,1
  4345                              <1> ;	; 04/01/2015
  4346                              <1> ;	mov	ax,[di+hd_cports]
  4347                              <1> ;	cmp	ax,[HF_REG_PORT]
  4348                              <1> ;	je	short drst4
  4349                              <1> ;	mov	[HF_REG_PORT], ax
  4350                              <1> ;	; 03/01/2015
  4351                              <1> ;	mov	ax,[di+hd_ports]
  4352                              <1> ;       mov     [HF_PORT], ax
  4353                              <1> ;	; 05/01/2014
  4354                              <1> ;	shr	di,1
  4355                              <1> ;	; 04/01/2015
  4356                              <1> ;	jmp	short drst0	; reset other controller
  4357                              <1> ;drst4:
  4358                              <1> ;	; 05/01/2015
  4359                              <1> ;	shr	di,1
  4360                              <1> ;	mov	al,[di+hd_dregs]
  4361                              <1> ;	and	al,10h ; bit 4 only
  4362                              <1> ;	shr	al,4 ; bit 4  -> bit 0
  4363                              <1> ;	mov	[hf_m_s], al ; (0 = master, 1 = slave)
  4364                              <1> 	;
  4365 000045FC A0[4C5C0000]        <1> 	mov	al, [hf_m_s] ; 18/01/2015
  4366 00004601 A801                <1> 	test	al,1
  4367                              <1> ;	jnz	short drst6
  4368 00004603 7516                <1>         jnz     short drst4
  4369 00004605 8065FDEF            <1> 	AND     byte [CMD_BLOCK+5],0EFH ; SET TO DRIVE 0
  4370                              <1> ;drst5:
  4371                              <1> drst3:
  4372 00004609 E835010000          <1> 	CALL	INIT_DRV		; SET MAX HEADS
  4373                              <1> 	;mov	dx,di
  4374 0000460E E8ED010000          <1> 	CALL	HDISK_RECAL		; RECAL TO RESET SEEK SPEED
  4375                              <1> 	; 04/01/2014
  4376                              <1> ;	inc	di
  4377                              <1> ;	mov	dx,di
  4378                              <1> ;	cmp	dl,[HF_NUM]
  4379                              <1> ;	jb	short drst3
  4380                              <1> ;DRE:
  4381 00004613 C605[7B420100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; IGNORE ANY SET UP ERRORS
  4382 0000461A C3                  <1> 	RETn
  4383                              <1> ;drst6:
  4384                              <1> drst4:		; Drive/Head Register - bit 4
  4385 0000461B 804DFD10            <1> 	OR      byte [CMD_BLOCK+5],010H ; SET TO DRIVE 1     
  4386                              <1>         ;jmp    short drst5
  4387 0000461F EBE8                <1>         jmp     short drst3
  4388                              <1> 
  4389                              <1> ;----------------------------------------
  4390                              <1> ;	DISK STATUS ROUTINE  (AH = 01H) :
  4391                              <1> ;----------------------------------------
  4392                              <1> 
  4393                              <1> RETURN_STATUS:
  4394 00004621 A0[7B420100]        <1> 	MOV	AL,[DISK_STATUS1]	; OBTAIN PREVIOUS STATUS
  4395 00004626 C605[7B420100]00    <1>         MOV     byte [DISK_STATUS1],0   ; RESET STATUS
  4396 0000462D C3                  <1> 	RETn
  4397                              <1> 
  4398                              <1> ;----------------------------------------
  4399                              <1> ;	DISK READ ROUTINE    (AH = 02H) :
  4400                              <1> ;----------------------------------------
  4401                              <1> 
  4402                              <1> DISK_READ:
  4403 0000462E C645FE20            <1> 	MOV	byte [CMD_BLOCK+6],READ_CMD
  4404 00004632 E954020000          <1>         JMP     COMMANDI
  4405                              <1> 
  4406                              <1> ;----------------------------------------
  4407                              <1> ;	DISK WRITE ROUTINE   (AH = 03H) :
  4408                              <1> ;----------------------------------------
  4409                              <1> 
  4410                              <1> DISK_WRITE:
  4411 00004637 C645FE30            <1> 	MOV	byte [CMD_BLOCK+6],WRITE_CMD
  4412 0000463B E9A6020000          <1>         JMP     COMMANDO
  4413                              <1> 
  4414                              <1> ;----------------------------------------
  4415                              <1> ;	DISK VERIFY	     (AH = 04H) :
  4416                              <1> ;----------------------------------------
  4417                              <1> 
  4418                              <1> DISK_VERF:
  4419 00004640 C645FE40            <1> 	MOV	byte [CMD_BLOCK+6],VERIFY_CMD
  4420 00004644 E814030000          <1> 	CALL	COMMAND
  4421 00004649 750C                <1> 	JNZ	short VERF_EXIT		; CONTROLLER STILL BUSY
  4422 0000464B E886030000          <1> 	CALL	_WAIT			; (Original: CALL WAIT)	
  4423 00004650 7505                <1> 	JNZ	short VERF_EXIT		; TIME OUT
  4424 00004652 E813040000          <1> 	CALL	CHECK_STATUS
  4425                              <1> VERF_EXIT:
  4426 00004657 C3                  <1> 	RETn
  4427                              <1> 
  4428                              <1> ;----------------------------------------
  4429                              <1> ;	FORMATTING	     (AH = 05H) :
  4430                              <1> ;----------------------------------------
  4431                              <1> 
  4432                              <1> FMT_TRK:				; FORMAT TRACK	(AH = 005H)
  4433 00004658 C645FE50            <1> 	MOV	byte [CMD_BLOCK+6],FMTTRK_CMD
  4434                              <1> 	;PUSH	ES
  4435                              <1> 	;PUSH	BX
  4436 0000465C 53                  <1> 	push	ebx
  4437 0000465D E8BA040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS ADDRESS
  4438                              <1> 	;MOV	AL,[ES:BX+14]		; GET SECTORS/TRACK
  4439 00004662 8A430E              <1> 	mov	al, [ebx+14]
  4440 00004665 8845F9              <1> 	MOV	[CMD_BLOCK+1],AL 	; SET SECTOR COUNT IN COMMAND
  4441 00004668 5B                  <1> 	pop	ebx
  4442                              <1> 	;POP	BX
  4443                              <1> 	;POP	ES
  4444 00004669 E97F020000          <1>         JMP     CMD_OF                  ; GO EXECUTE THE COMMAND
  4445                              <1> 
  4446                              <1> ;----------------------------------------
  4447                              <1> ;	READ DASD TYPE	     (AH = 15H) :
  4448                              <1> ;----------------------------------------
  4449                              <1> 
  4450                              <1> READ_DASD_TYPE:
  4451                              <1> READ_D_T:				; GET DRIVE PARAMETERS
  4452 0000466E 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4453                              <1> 	;PUSH	ES
  4454 0000466F 53                  <1> 	PUSH	eBX
  4455                              <1> 	;CALL	DDS			; ESTABLISH ADDRESSING
  4456                              <1> 	;push	cs
  4457                              <1> 	;pop	ds
  4458 00004670 66BB1000            <1>         mov	bx, KDATA
  4459 00004674 8EDB                <1> 	mov	ds, bx
  4460                              <1> 	;mov	es, bx
  4461 00004676 C605[7B420100]00    <1> 	MOV     byte [DISK_STATUS1],0
  4462 0000467D 8A1D[7C420100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4463 00004683 80E27F              <1> 	AND	DL,7FH			; GET DRIVE NUMBER
  4464 00004686 38D3                <1> 	CMP	BL,DL
  4465 00004688 7627                <1> 	JBE	short RDT_NOT_PRESENT 	; RETURN DRIVE NOT PRESENT
  4466 0000468A E88D040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETER ADDRESS
  4467                              <1> 	;MOV	AL,[ES:BX+2]		; HEADS
  4468 0000468F 8A4302              <1> 	mov	al, [ebx+2]
  4469                              <1> 	;MOV	CL,[ES:BX+14]
  4470 00004692 8A4B0E              <1> 	mov	cl, [ebx+14]
  4471 00004695 F6E9                <1> 	IMUL	CL			; * NUMBER OF SECTORS
  4472                              <1> 	;MOV	CX,[ES:BX]		; MAX NUMBER OF CYLINDERS
  4473 00004697 668B0B              <1> 	mov	cx ,[ebx]
  4474                              <1> 	;
  4475                              <1> 	; 02/01/2015 
  4476                              <1> 	; ** leave the last cylinder as reserved for diagnostics **
  4477                              <1> 	; (Also in Award BIOS - 1999, AHDSK.ASM, FUN15 -> sub ax, 1)
  4478 0000469A 6649                <1> 	DEC	CX			; LEAVE ONE FOR DIAGNOSTICS
  4479                              <1> 	;
  4480 0000469C 66F7E9              <1> 	IMUL	CX			; NUMBER OF SECTORS
  4481 0000469F 6689D1              <1> 	MOV	CX,DX			; HIGH ORDER HALF
  4482 000046A2 6689C2              <1> 	MOV	DX,AX			; LOW ORDER HALF
  4483                              <1> 	;SUB	AX,AX
  4484 000046A5 28C0                <1> 	sub	al, al
  4485 000046A7 B403                <1> 	MOV	AH,03H			; INDICATE FIXED DISK
  4486 000046A9 5B                  <1> RDT2:	POP	eBX			; RESTORE REGISTERS
  4487                              <1> 	;POP	ES
  4488 000046AA 1F                  <1> 	POP	DS
  4489                              <1> 	; (*) CLC			; CLEAR CARRY
  4490                              <1> 	;RETf	2
  4491                              <1> 	; (*) 29/05/2016
  4492                              <1> 	; (*) retf 4
  4493 000046AB 80642408FE          <1> 	and	byte [esp+8], 0FEh ; clear carry bit of eflags register
  4494 000046B0 CF                  <1> 	iretd
  4495                              <1> 
  4496                              <1> RDT_NOT_PRESENT:
  4497 000046B1 6629C0              <1> 	SUB	AX,AX			; DRIVE NOT PRESENT RETURN
  4498 000046B4 6689C1              <1> 	MOV	CX,AX			; ZERO BLOCK COUNT
  4499 000046B7 6689C2              <1> 	MOV	DX,AX
  4500 000046BA EBED                <1> 	JMP	short RDT2
  4501                              <1> 
  4502                              <1> ; 28/05/2016
  4503                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  4504                              <1> 
  4505                              <1> ;----------------------------------------
  4506                              <1> ;	GET PARAMETERS	     (AH = 08H) :
  4507                              <1> ;----------------------------------------
  4508                              <1> 
  4509                              <1> GET_PARM_N:
  4510                              <1> 	; ebx = user's buffer address for parameters table
  4511                              <1> ;GET_PARM:				; GET DRIVE PARAMETERS
  4512 000046BC 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4513 000046BD 06                  <1> 	PUSH	ES
  4514 000046BE 53                  <1> 	PUSH	eBX
  4515                              <1> 	;MOV	AX,ABS0 		; ESTABLISH ADDRESSING
  4516                              <1> 	;MOV	DS,AX
  4517                              <1> 	;TEST	DL,1			; CHECK FOR DRIVE 1
  4518                              <1> 	;JZ	short G0
  4519                              <1> 	;LES	BX,@HF1_TBL_VEC
  4520                              <1> 	;JMP	SHORT G1
  4521                              <1> ;G0:	LES	BX,@HF_TBL_VEC
  4522                              <1> ;G1:
  4523                              <1> 	;CALL	DDS			; ESTABLISH SEGMENT
  4524                              <1> 	; 22/12/2014
  4525                              <1> 	;push	cs
  4526                              <1> 	;pop	ds
  4527 000046BF 66BB1000            <1> 	mov	bx, KDATA
  4528 000046C3 8EDB                <1> 	mov	ds, bx
  4529 000046C5 8EC3                <1> 	mov	es, bx	; 27/05/2016
  4530                              <1> 	;
  4531 000046C7 80EA80              <1> 	SUB	DL,80H
  4532 000046CA 80FA04              <1> 	CMP	DL,MAX_FILE		; TEST WITHIN RANGE
  4533 000046CD 7361                <1> 	JAE	short G4
  4534                              <1> 	;
  4535 000046CF 31DB                <1> 	xor	ebx, ebx ; 21/02/2015
  4536                              <1> 	; 22/12/2014
  4537 000046D1 88D3                <1> 	mov	bl, dl
  4538                              <1> 	;xor	bh, bh  
  4539 000046D3 C0E302              <1> 	shl	bl, 2			; convert index to offset
  4540                              <1> 	;add	bx, HF_TBL_VEC
  4541 000046D6 81C3[80420100]      <1> 	add	ebx, HF_TBL_VEC
  4542                              <1> 	;mov	ax, [bx+2]
  4543                              <1> 	;mov	es, ax			; dpt segment
  4544                              <1> 	;mov	bx, [bx]		; dpt offset
  4545 000046DC 8B1B                <1> 	mov	ebx, [ebx] ; 32 bit offset	
  4546                              <1> 
  4547 000046DE C605[7B420100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4548                              <1>         ;MOV     AX,[ES:BX]             ; MAX NUMBER OF CYLINDERS
  4549 000046E5 668B03              <1> 	mov	ax, [ebx]
  4550                              <1> 	;;SUB	AX,2			; ADJUST FOR 0-N
  4551 000046E8 6648                <1> 	dec	ax			; max. cylinder number
  4552 000046EA 88C5                <1> 	MOV	CH,AL
  4553 000046EC 66250003            <1> 	AND	AX,0300H		; HIGH TWO BITS OF CYLINDER
  4554 000046F0 66D1E8              <1> 	SHR	AX,1
  4555 000046F3 66D1E8              <1> 	SHR	AX,1
  4556                              <1> 	;OR	AL,[ES:BX+14]		; SECTORS
  4557 000046F6 0A430E              <1> 	or	al, [ebx+14]
  4558 000046F9 88C1                <1> 	MOV	CL,AL
  4559                              <1> 	;MOV	DH,[ES:BX+2]		; HEADS
  4560 000046FB 8A7302              <1> 	mov	dh, [ebx+2]
  4561 000046FE FECE                <1> 	DEC	DH			; 0-N RANGE
  4562 00004700 8A15[7C420100]      <1> 	MOV	DL,[HF_NUM]		; DRIVE COUNT
  4563 00004706 6629C0              <1> 	SUB	AX,AX
  4564                              <1>         ;27/12/2014 
  4565                              <1> 	;mov	di, bx			; HDPT offset
  4566                              <1> 	
  4567                              <1> 	; 27/05/2016
  4568                              <1> 	; return fixed disk parameters table to user
  4569                              <1> 	; in user's buffer, which is pointed by EBX
  4570                              <1> 	;
  4571 00004709 873C24              <1> 	xchg	edi, [esp]		; ebx (input)-> edi, edi -> [esp]
  4572 0000470C 56                  <1> 	push	esi
  4573 0000470D 89DE                <1> 	mov	esi, ebx		; hard disk parameter table (32 bytes)	
  4574 0000470F 89FB                <1> 	mov	ebx, edi		; ebx = user's buffer address
  4575 00004711 51                  <1> 	push	ecx
  4576 00004712 50                  <1> 	push	eax
  4577 00004713 B920000000          <1> 	mov	ecx, 32 ; 32 bytes
  4578 00004718 E8AFA00000          <1> 	call	transfer_to_user_buffer ; trdosk6.s (16/05/2016)
  4579 0000471D 58                  <1> 	pop	eax
  4580 0000471E 59                  <1> 	pop	ecx
  4581 0000471F 5E                  <1> 	pop	esi
  4582 00004720 5F                  <1> 	pop	edi
  4583 00004721 730A                <1> 	jnc	short G5
  4584                              <1> 	; 29/05/2016 (*)
  4585 00004723 B8FF000000          <1> 	mov	eax, 0FFh ; unknown error !
  4586                              <1> _G6:
  4587 00004728 804C241001          <1> 	or	byte [esp+16], 1 ; set carry bit of eflags register
  4588                              <1> G5:
  4589                              <1> 	; 27/05/2016
  4590                              <1> 	;POP	eBX			; RESTORE REGISTERS
  4591 0000472D 07                  <1> 	POP	ES
  4592 0000472E 1F                  <1> 	POP	DS
  4593                              <1> 	;RETf	2
  4594                              <1> 	; (*) 29/05/2016
  4595                              <1> 	; (*) retf 4
  4596                              <1> 	; (*) or byte [esp+8], 1 ; set carry bit of eflags register
  4597 0000472F CF                  <1> 	iretd
  4598                              <1> G4:
  4599 00004730 C605[7B420100]07    <1> 	MOV     byte [DISK_STATUS1],INIT_FAIL ; OPERATION FAILED
  4600 00004737 B407                <1> 	MOV	AH,INIT_FAIL
  4601 00004739 28C0                <1> 	SUB	AL,AL
  4602 0000473B 6629D2              <1> 	SUB	DX,DX
  4603 0000473E 6629C9              <1> 	SUB	CX,CX
  4604                              <1> 	; 29/05/2016 (*)
  4605                              <1> 	;STC				; SET ERROR FLAG
  4606                              <1> 	;JMP	short G5
  4607 00004741 EBE5                <1> 	jmp	short _G6
  4608                              <1> 
  4609                              <1> ;----------------------------------------
  4610                              <1> ;	INITIALIZE DRIVE     (AH = 09H) :
  4611                              <1> ;----------------------------------------
  4612                              <1> 	; 03/01/2015
  4613                              <1> 	; According to ATA-ATAPI specification v2.0 to v5.0
  4614                              <1> 	; logical sector per logical track
  4615                              <1> 	; and logical heads - 1 would be set but
  4616                              <1> 	; it is seen as it will be good
  4617                              <1> 	; if physical parameters will be set here
  4618                              <1> 	; because, number of heads <= 16.
  4619                              <1> 	; (logical heads usually more than 16)
  4620                              <1> 	; NOTE: ATA logical parameters (software C, H, S)
  4621                              <1> 	;	== INT 13h physical parameters
  4622                              <1> 
  4623                              <1> ;INIT_DRV:
  4624                              <1> ;	MOV	byte [CMD_BLOCK+6],SET_PARM_CMD
  4625                              <1> ;	CALL	GET_VEC 		; ES:BX -> PARAMETER BLOCK
  4626                              <1> ;	MOV	AL,[ES:BX+2]		; GET NUMBER OF HEADS
  4627                              <1> ;	DEC	AL			; CONVERT TO 0-INDEX
  4628                              <1> ;	MOV	AH,[CMD_BLOCK+5] 	; GET SDH REGISTER
  4629                              <1> ;	AND	AH,0F0H 		; CHANGE HEAD NUMBER
  4630                              <1> ;	OR	AH,AL			; TO MAX HEAD
  4631                              <1> ;	MOV	[CMD_BLOCK+5],AH
  4632                              <1> ;	MOV	AL,[ES:BX+14]		; MAX SECTOR NUMBER
  4633                              <1> ;	MOV	[CMD_BLOCK+1],AL
  4634                              <1> ;	SUB	AX,AX
  4635                              <1> ;	MOV	[CMD_BLOCK+3],AL 	; ZERO FLAGS
  4636                              <1> ;	CALL	COMMAND 		; TELL CONTROLLER
  4637                              <1> ;	JNZ	short INIT_EXIT		; CONTROLLER BUSY ERROR
  4638                              <1> ;	CALL	NOT_BUSY		; WAIT FOR IT TO BE DONE
  4639                              <1> ;	JNZ	short INIT_EXIT		; TIME OUT
  4640                              <1> ;	CALL	CHECK_STATUS
  4641                              <1> ;INIT_EXIT:
  4642                              <1> ;	RETn
  4643                              <1> 
  4644                              <1> ; 04/01/2015
  4645                              <1> ; 02/01/2015 - Derived from from AWARD BIOS 1999
  4646                              <1> ;				 AHDSK.ASM - INIT_DRIVE
  4647                              <1> INIT_DRV:
  4648                              <1> 	;xor	ah,ah
  4649 00004743 31C0                <1> 	xor	eax, eax ; 21/02/2015
  4650 00004745 B00B                <1> 	mov	al,11 ; Physical heads from translated HDPT
  4651 00004747 3825[90420100]      <1>         cmp     [LBAMode], ah   ; 0
  4652 0000474D 7702                <1> 	ja	short idrv0
  4653 0000474F B002                <1> 	mov	al,2  ; Physical heads from standard HDPT
  4654                              <1> idrv0:
  4655                              <1> 	; DL = drive number (0 based)
  4656 00004751 E8C6030000          <1> 	call	GET_VEC
  4657                              <1> 	;push	bx
  4658 00004756 53                  <1> 	push	ebx ; 21/02/2015
  4659                              <1> 	;add	bx,ax
  4660 00004757 01C3                <1> 	add	ebx, eax
  4661                              <1> 	;; 05/01/2015
  4662 00004759 8A25[4C5C0000]      <1> 	mov	ah, [hf_m_s] ; drive number (0= master, 1= slave)
  4663                              <1> 	;;and 	ah,1 
  4664 0000475F C0E404              <1> 	shl	ah,4
  4665 00004762 80CCA0              <1> 	or	ah,0A0h  ; Drive/Head register - 10100000b (A0h)	
  4666                              <1> 	;mov	al,[es:bx]
  4667 00004765 8A03                <1> 	mov	al, [ebx] ; 21/02/2015
  4668 00004767 FEC8                <1> 	dec	al	 ; last head number 
  4669                              <1> 	;and	al,0Fh
  4670 00004769 08E0                <1> 	or	al,ah	 ; lower 4 bits for head number
  4671                              <1> 	;
  4672 0000476B C645FE91            <1> 	mov	byte [CMD_BLOCK+6],SET_PARM_CMD
  4673 0000476F 8845FD              <1> 	mov	[CMD_BLOCK+5],al
  4674                              <1> 	;pop	bx
  4675 00004772 5B                  <1> 	pop	ebx
  4676 00004773 29C0                <1> 	sub	eax, eax ; 21/02/2015
  4677 00004775 B004                <1> 	mov	al,4 ; Physical sec per track from translated HDPT
  4678 00004777 803D[90420100]00    <1> 	cmp	byte [LBAMode], 0
  4679 0000477E 7702                <1> 	ja	short idrv1
  4680 00004780 B00E                <1> 	mov	al,14 ; Physical sec per track from standard HDPT
  4681                              <1> idrv1:
  4682                              <1> 	;xor	ah,ah
  4683                              <1> 	;add	bx,ax
  4684 00004782 01C3                <1> 	add	ebx, eax ; 21/02/2015
  4685                              <1> 	;mov	al,[es:bx]
  4686                              <1> 			; sector number
  4687 00004784 8A03                <1> 	mov	al, [ebx]
  4688 00004786 8845F9              <1> 	mov	[CMD_BLOCK+1],al
  4689 00004789 28C0                <1> 	sub	al,al
  4690 0000478B 8845FB              <1> 	mov	[CMD_BLOCK+3],al  ; ZERO FLAGS
  4691 0000478E E8CA010000          <1> 	call	COMMAND 	  ; TELL CONTROLLER
  4692 00004793 750C                <1> 	jnz	short INIT_EXIT	  ; CONTROLLER BUSY ERROR
  4693 00004795 E878020000          <1> 	call	NOT_BUSY	  ; WAIT FOR IT TO BE DONE
  4694 0000479A 7505                <1> 	jnz	short INIT_EXIT	  ; TIME OUT
  4695 0000479C E8C9020000          <1> 	call	CHECK_STATUS
  4696                              <1> INIT_EXIT:
  4697 000047A1 C3                  <1> 	RETn
  4698                              <1> 
  4699                              <1> ;----------------------------------------
  4700                              <1> ;	READ LONG	     (AH = 0AH) :
  4701                              <1> ;----------------------------------------
  4702                              <1> 
  4703                              <1> RD_LONG:
  4704                              <1> 	;MOV	@CMD_BLOCK+6,READ_CMD OR ECC_MODE
  4705 000047A2 C645FE22            <1>         mov     byte [CMD_BLOCK+6],READ_CMD + ECC_MODE 
  4706 000047A6 E9E0000000          <1>         JMP     COMMANDI
  4707                              <1> 
  4708                              <1> ;----------------------------------------
  4709                              <1> ;	WRITE LONG	     (AH = 0BH) :
  4710                              <1> ;----------------------------------------
  4711                              <1> 
  4712                              <1> WR_LONG:
  4713                              <1> 	;MOV	@CMD_BLOCK+6,WRITE_CMD OR ECC_MODE
  4714 000047AB C645FE32            <1>         MOV     byte [CMD_BLOCK+6],WRITE_CMD + ECC_MODE
  4715 000047AF E932010000          <1>         JMP     COMMANDO
  4716                              <1> 
  4717                              <1> ;----------------------------------------
  4718                              <1> ;	SEEK		     (AH = 0CH) :
  4719                              <1> ;----------------------------------------
  4720                              <1> 
  4721                              <1> DISK_SEEK:
  4722 000047B4 C645FE70            <1>         MOV     byte [CMD_BLOCK+6],SEEK_CMD
  4723 000047B8 E8A0010000          <1> 	CALL	COMMAND
  4724 000047BD 751C                <1> 	JNZ	short DS_EXIT 		; CONTROLLER BUSY ERROR
  4725 000047BF E812020000          <1> 	CALL	_WAIT
  4726 000047C4 7515                <1>         JNZ     DS_EXIT                 ; TIME OUT ON SEEK
  4727 000047C6 E89F020000          <1> 	CALL	CHECK_STATUS
  4728 000047CB 803D[7B420100]40    <1>         CMP     byte [DISK_STATUS1],BAD_SEEK
  4729 000047D2 7507                <1> 	JNE	short DS_EXIT
  4730 000047D4 C605[7B420100]00    <1>         MOV     byte [DISK_STATUS1],0
  4731                              <1> DS_EXIT:
  4732 000047DB C3                  <1> 	RETn
  4733                              <1> 
  4734                              <1> ;----------------------------------------
  4735                              <1> ;	TEST DISK READY      (AH = 10H) :
  4736                              <1> ;----------------------------------------
  4737                              <1> 
  4738                              <1> TST_RDY:				; WAIT FOR CONTROLLER
  4739 000047DC E831020000          <1> 	CALL	NOT_BUSY
  4740 000047E1 751C                <1> 	JNZ	short TR_EX
  4741 000047E3 8A45FD              <1> 	MOV	AL,[CMD_BLOCK+5] 	; SELECT DRIVE
  4742 000047E6 668B15[485C0000]    <1> 	MOV	DX,[HF_PORT]
  4743 000047ED 80C206              <1> 	add	dl,6
  4744 000047F0 EE                  <1> 	OUT	DX,AL
  4745 000047F1 E88C020000          <1> 	CALL	CHECK_ST		; CHECK STATUS ONLY
  4746 000047F6 7507                <1> 	JNZ	short TR_EX
  4747 000047F8 C605[7B420100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; WIPE OUT DATA CORRECTED ERROR
  4748                              <1> TR_EX:	
  4749 000047FF C3                  <1> 	RETn
  4750                              <1> 
  4751                              <1> ;----------------------------------------
  4752                              <1> ;	RECALIBRATE	     (AH = 11H) :
  4753                              <1> ;----------------------------------------
  4754                              <1> 
  4755                              <1> HDISK_RECAL:
  4756 00004800 C645FE10            <1>         MOV     byte [CMD_BLOCK+6],RECAL_CMD ; 10h, 16
  4757 00004804 E854010000          <1> 	CALL	COMMAND 		; START THE OPERATION
  4758 00004809 7523                <1> 	JNZ	short RECAL_EXIT	; ERROR
  4759 0000480B E8C6010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION
  4760 00004810 7407                <1> 	JZ	short RECAL_X 		; TIME OUT ONE OK ?
  4761 00004812 E8BF010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION LONGER
  4762 00004817 7515                <1> 	JNZ	short RECAL_EXIT	; TIME OUT TWO TIMES IS ERROR
  4763                              <1> RECAL_X:
  4764 00004819 E84C020000          <1> 	CALL	CHECK_STATUS
  4765 0000481E 803D[7B420100]40    <1> 	CMP	byte [DISK_STATUS1],BAD_SEEK ; SEEK NOT COMPLETE
  4766 00004825 7507                <1> 	JNE	short RECAL_EXIT	; IS OK
  4767 00004827 C605[7B420100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4768                              <1> RECAL_EXIT:
  4769 0000482E 803D[7B420100]00    <1>         CMP     byte [DISK_STATUS1],0
  4770 00004835 C3                  <1> 	RETn
  4771                              <1> 
  4772                              <1> ;----------------------------------------
  4773                              <1> ;      CONTROLLER DIAGNOSTIC (AH = 14H) :
  4774                              <1> ;----------------------------------------
  4775                              <1> 
  4776                              <1> CTLR_DIAGNOSTIC:
  4777 00004836 FA                  <1>         CLI                             ; DISABLE INTERRUPTS WHILE CHANGING MASK
  4778 00004837 E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  4779                              <1> 	;AND	AL,0BFH
  4780 00004839 243F                <1> 	and	al, 3Fh			; enable IRQ 14 & IRQ 15
  4781                              <1> 	;JMP	$+2
  4782                              <1> 	IODELAY
  4782 0000483B EB00                <2>  jmp short $+2
  4782 0000483D EB00                <2>  jmp short $+2
  4783 0000483F E6A1                <1> 	OUT	INTB01,AL
  4784                              <1> 	IODELAY
  4784 00004841 EB00                <2>  jmp short $+2
  4784 00004843 EB00                <2>  jmp short $+2
  4785 00004845 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  4786 00004847 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  4787                              <1> 	;JMP	$+2
  4788                              <1> 	IODELAY
  4788 00004849 EB00                <2>  jmp short $+2
  4788 0000484B EB00                <2>  jmp short $+2
  4789 0000484D E621                <1> 	OUT	INTA01,AL
  4790 0000484F FB                  <1> 	STI
  4791 00004850 E8BD010000          <1> 	CALL	NOT_BUSY		; WAIT FOR CARD
  4792 00004855 752B                <1> 	JNZ	short CD_ERR		; BAD CARD
  4793                              <1> 	;MOV	DX, HF_PORT+7
  4794 00004857 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  4795 0000485E 80C207              <1> 	add	dl, 7
  4796 00004861 B090                <1> 	MOV	AL,DIAG_CMD		; START DIAGNOSE
  4797 00004863 EE                  <1> 	OUT	DX,AL
  4798 00004864 E8A9010000          <1> 	CALL	NOT_BUSY		; WAIT FOR IT TO COMPLETE
  4799 00004869 B480                <1> 	MOV	AH,TIME_OUT
  4800 0000486B 7517                <1> 	JNZ	short CD_EXIT 		; TIME OUT ON DIAGNOSTIC
  4801                              <1> 	;MOV	DX,HF_PORT+1		; GET ERROR REGISTER
  4802 0000486D 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  4803 00004874 FEC2                <1> 	inc	dl
  4804 00004876 EC                  <1> 	IN	AL,DX
  4805 00004877 A2[72420100]        <1> 	MOV	[HF_ERROR],AL		; SAVE IT
  4806 0000487C B400                <1> 	MOV	AH,0
  4807 0000487E 3C01                <1> 	CMP	AL,1			; CHECK FOR ALL OK
  4808 00004880 7402                <1> 	JE	SHORT CD_EXIT
  4809 00004882 B420                <1> CD_ERR: MOV	AH,BAD_CNTLR
  4810                              <1> CD_EXIT:
  4811 00004884 8825[7B420100]      <1> 	MOV	[DISK_STATUS1],AH
  4812 0000488A C3                  <1> 	RETn
  4813                              <1> 
  4814                              <1> ;----------------------------------------
  4815                              <1> ; COMMANDI				:
  4816                              <1> ;	REPEATEDLY INPUTS DATA TILL	:
  4817                              <1> ;	NSECTOR RETURNS ZERO		:
  4818                              <1> ;----------------------------------------
  4819                              <1> COMMANDI:
  4820 0000488B E862020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4821 00004890 7253                <1> 	JC	short CMD_ABORT
  4822                              <1> 	;MOV	DI,BX
  4823 00004892 89DF                <1> 	mov	edi, ebx ; 21/02/2015
  4824 00004894 E8C4000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4825 00004899 754A                <1> 	JNZ	short CMD_ABORT
  4826                              <1> CMD_I1:
  4827 0000489B E836010000          <1> 	CALL	_WAIT			; WAIT FOR DATA REQUEST INTERRUPT
  4828 000048A0 7543                <1> 	JNZ	short TM_OUT		; TIME OUT
  4829                              <1> cmd_i1x: ; 18/02/2016
  4830                              <1> 	;MOV	CX,256			; SECTOR SIZE IN WORDS
  4831 000048A2 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015	
  4832                              <1> 	;MOV	DX,HF_PORT
  4833 000048A7 668B15[485C0000]    <1> 	mov	dx,[HF_PORT]
  4834 000048AE FA                  <1> 	CLI
  4835 000048AF FC                  <1> 	CLD
  4836 000048B0 F3666D              <1> 	REP	INSW			; GET THE SECTOR
  4837 000048B3 FB                  <1> 	STI
  4838 000048B4 F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL INPUT
  4839 000048B8 7419                <1> 	JZ	short CMD_I3
  4840 000048BA E880010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4841 000048BF 7224                <1> 	JC	short TM_OUT
  4842                              <1> 	;MOV	DX,HF_PORT
  4843 000048C1 668B15[485C0000]    <1> 	mov	dx,[HF_PORT]
  4844                              <1> 	;MOV	CX,4			; GET ECC BYTES
  4845 000048C8 B904000000          <1> 	mov 	ecx, 4 ; mov cx, 4 
  4846 000048CD EC                  <1> CMD_I2: IN	AL,DX
  4847                              <1> 	;MOV	[ES:DI],AL		; GO SLOW FOR BOARD
  4848 000048CE 8807                <1> 	mov 	[edi], al ; 21/02/2015
  4849 000048D0 47                  <1> 	INC	eDI
  4850 000048D1 E2FA                <1> 	LOOP	CMD_I2
  4851                              <1> CMD_I3: 
  4852                              <1> 	; wait for 400 ns
  4853 000048D3 80C207              <1> 	add 	dl, 7
  4854 000048D6 EC                  <1> 	in	al, dx
  4855 000048D7 EC                  <1> 	in	al, dx
  4856 000048D8 EC                  <1> 	in	al, dx
  4857                              <1> 	;
  4858 000048D9 E88C010000          <1> 	CALL	CHECK_STATUS
  4859 000048DE 7505                <1> 	JNZ	short CMD_ABORT		; ERROR RETURNED
  4860 000048E0 FE4DF9              <1> 	DEC	byte [CMD_BLOCK+1]	; CHECK FOR MORE
  4861                              <1> 	;JNZ	SHORT CMD_I1
  4862 000048E3 75BD                <1> 	jnz	short cmd_i1x ; 18/02/2016
  4863                              <1> CMD_ABORT:
  4864 000048E5 C3                  <1> TM_OUT: RETn
  4865                              <1> 
  4866                              <1> ;----------------------------------------
  4867                              <1> ; COMMANDO				:
  4868                              <1> ;	REPEATEDLY OUTPUTS DATA TILL	:
  4869                              <1> ;	NSECTOR RETURNS ZERO		:
  4870                              <1> ;----------------------------------------
  4871                              <1> COMMANDO:
  4872 000048E6 E807020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4873 000048EB 72F8                <1> 	JC	short CMD_ABORT
  4874 000048ED 89DE                <1> CMD_OF: MOV	eSI,eBX ; 21/02/2015
  4875 000048EF E869000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4876 000048F4 75EF                <1> 	JNZ	short CMD_ABORT
  4877 000048F6 E844010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4878 000048FB 72E8                <1> 	JC	short TM_OUT			; TOO LONG
  4879                              <1> CMD_O1: ;PUSH	DS
  4880                              <1> 	;PUSH	ES			; MOVE ES TO DS
  4881                              <1> 	;POP	DS
  4882                              <1> 	;MOV	CX,256			; PUT THE DATA OUT TO THE CARD
  4883                              <1> 	;MOV	DX,HF_PORT
  4884                              <1> 	; 01/02/2015
  4885 000048FD 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  4886                              <1> 	;push	es
  4887                              <1> 	;pop	ds
  4888                              <1> 	;mov	cx, 256
  4889 00004904 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015
  4890 00004909 FA                  <1> 	CLI
  4891 0000490A FC                  <1> 	CLD
  4892 0000490B F3666F              <1> 	REP	OUTSW
  4893 0000490E FB                  <1> 	STI
  4894                              <1> 	;POP	DS			; RESTORE DS
  4895 0000490F F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL OUTPUT
  4896 00004913 7419                <1> 	JZ	short CMD_O3
  4897 00004915 E825010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4898 0000491A 72C9                <1> 	JC	short TM_OUT
  4899                              <1> 	;MOV	DX,HF_PORT
  4900 0000491C 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  4901                              <1> 	;MOV	CX,4			; OUTPUT THE ECC BYTES
  4902 00004923 B904000000          <1> 	mov	ecx, 4  ; mov cx, 4
  4903                              <1> CMD_O2: ;MOV	AL,[ES:SI]
  4904 00004928 8A06                <1> 	mov	al, [esi]
  4905 0000492A EE                  <1> 	OUT	DX,AL
  4906 0000492B 46                  <1> 	INC	eSI
  4907 0000492C E2FA                <1> 	LOOP	CMD_O2
  4908                              <1> CMD_O3:
  4909 0000492E E8A3000000          <1> 	CALL	_WAIT			; WAIT FOR SECTOR COMPLETE INTERRUPT
  4910 00004933 75B0                <1> 	JNZ	short TM_OUT		; ERROR RETURNED
  4911 00004935 E830010000          <1> 	CALL	CHECK_STATUS
  4912 0000493A 75A9                <1> 	JNZ	short CMD_ABORT
  4913 0000493C F605[71420100]08    <1> 	TEST	byte [HF_STATUS],ST_DRQ	; CHECK FOR MORE
  4914 00004943 75B8                <1> 	JNZ	SHORT CMD_O1
  4915                              <1> 	;MOV	DX,HF_PORT+2		; CHECK RESIDUAL SECTOR COUNT
  4916 00004945 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  4917                              <1> 	;add	dl, 2
  4918 0000494C FEC2                <1> 	inc	dl
  4919 0000494E FEC2                <1> 	inc	dl
  4920 00004950 EC                  <1> 	IN	AL,DX			;
  4921 00004951 A8FF                <1> 	TEST	AL,0FFH 		;
  4922 00004953 7407                <1> 	JZ	short CMD_O4			; COUNT = 0  OK
  4923 00004955 C605[7B420100]BB    <1> 	MOV	byte [DISK_STATUS1],UNDEF_ERR 
  4924                              <1> 					; OPERATION ABORTED - PARTIAL TRANSFER
  4925                              <1> CMD_O4:
  4926 0000495C C3                  <1> 	RETn
  4927                              <1> 
  4928                              <1> ;--------------------------------------------------------
  4929                              <1> ; COMMAND						:
  4930                              <1> ;	THIS ROUTINE OUTPUTS THE COMMAND BLOCK		:
  4931                              <1> ; OUTPUT						:
  4932                              <1> ;	BL = STATUS					:
  4933                              <1> ;	BH = ERROR REGISTER				:
  4934                              <1> ;--------------------------------------------------------
  4935                              <1> 
  4936                              <1> COMMAND:
  4937 0000495D 53                  <1> 	PUSH	eBX			; WAIT FOR SEEK COMPLETE AND READY
  4938                              <1> 	;;MOV	CX,DELAY_2		; SET INITIAL DELAY BEFORE TEST
  4939                              <1> COMMAND1:
  4940                              <1> 	;;PUSH	CX			; SAVE LOOP COUNT
  4941 0000495E E879FEFFFF          <1> 	CALL	TST_RDY 		; CHECK DRIVE READY
  4942                              <1> 	;;POP	CX
  4943 00004963 7419                <1> 	JZ	short COMMAND2		; DRIVE IS READY
  4944 00004965 803D[7B420100]80    <1>         CMP     byte [DISK_STATUS1],TIME_OUT ; TST_RDY TIMED OUT--GIVE UP
  4945                              <1> 	;JZ	short CMD_TIMEOUT
  4946                              <1> 	;;LOOP	COMMAND1		; KEEP TRYING FOR A WHILE
  4947                              <1> 	;JMP	SHORT COMMAND4		; ITS NOT GOING TO GET READY
  4948 0000496C 7507                <1> 	jne	short COMMAND4
  4949                              <1> CMD_TIMEOUT:
  4950 0000496E C605[7B420100]20    <1> 	MOV	byte [DISK_STATUS1],BAD_CNTLR
  4951                              <1> COMMAND4:
  4952 00004975 5B                  <1> 	POP	eBX
  4953 00004976 803D[7B420100]00    <1>         CMP     byte [DISK_STATUS1],0   ; SET CONDITION CODE FOR CALLER
  4954 0000497D C3                  <1> 	RETn
  4955                              <1> COMMAND2:
  4956 0000497E 5B                  <1> 	POP	eBX
  4957 0000497F 57                  <1> 	PUSH	eDI
  4958 00004980 C605[73420100]00    <1> 	MOV	byte [HF_INT_FLAG],0	; RESET INTERRUPT FLAG
  4959 00004987 FA                  <1> 	CLI				; INHIBIT INTERRUPTS WHILE CHANGING MASK
  4960 00004988 E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  4961                              <1> 	;AND	AL,0BFH
  4962 0000498A 243F                <1> 	and	al, 3Fh			; Enable IRQ 14 & 15
  4963                              <1> 	;JMP	$+2
  4964                              <1> 	IODELAY
  4964 0000498C EB00                <2>  jmp short $+2
  4964 0000498E EB00                <2>  jmp short $+2
  4965 00004990 E6A1                <1> 	OUT	INTB01,AL
  4966 00004992 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  4967 00004994 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  4968                              <1> 	;JMP	$+2
  4969                              <1> 	IODELAY
  4969 00004996 EB00                <2>  jmp short $+2
  4969 00004998 EB00                <2>  jmp short $+2
  4970 0000499A E621                <1> 	OUT	INTA01,AL
  4971 0000499C FB                  <1> 	STI
  4972 0000499D 31FF                <1> 	XOR	eDI,eDI			; INDEX THE COMMAND TABLE
  4973                              <1> 	;MOV	DX,HF_PORT+1		; DISK ADDRESS
  4974 0000499F 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  4975 000049A6 FEC2                <1> 	inc	dl
  4976 000049A8 F605[7D420100]C0    <1> 	TEST	byte [CONTROL_BYTE],0C0H ; CHECK FOR RETRY SUPPRESSION
  4977 000049AF 7411                <1> 	JZ	short COMMAND3
  4978 000049B1 8A45FE              <1> 	MOV	AL, [CMD_BLOCK+6] 	; YES-GET OPERATION CODE
  4979 000049B4 24F0                <1> 	AND	AL,0F0H 		; GET RID OF MODIFIERS
  4980 000049B6 3C20                <1> 	CMP	AL,20H			; 20H-40H IS READ, WRITE, VERIFY
  4981 000049B8 7208                <1> 	JB	short COMMAND3
  4982 000049BA 3C40                <1> 	CMP	AL,40H
  4983 000049BC 7704                <1> 	JA	short COMMAND3
  4984 000049BE 804DFE01            <1> 	OR	byte [CMD_BLOCK+6],NO_RETRIES 
  4985                              <1> 					; VALID OPERATION FOR RETRY SUPPRESS
  4986                              <1> COMMAND3:
  4987 000049C2 8A443DF8            <1> 	MOV	AL,[CMD_BLOCK+eDI]	; GET THE COMMAND STRING BYTE
  4988 000049C6 EE                  <1> 	OUT	DX,AL			; GIVE IT TO CONTROLLER
  4989                              <1> 	IODELAY
  4989 000049C7 EB00                <2>  jmp short $+2
  4989 000049C9 EB00                <2>  jmp short $+2
  4990 000049CB 47                  <1> 	INC	eDI			; NEXT BYTE IN COMMAND BLOCK
  4991 000049CC 6642                <1> 	INC	DX			; NEXT DISK ADAPTER REGISTER
  4992 000049CE 6683FF07            <1> 	cmp	di, 7	; 1/1/2015	; ALL DONE?
  4993 000049D2 75EE                <1> 	JNZ	short COMMAND3		; NO--GO DO NEXT ONE
  4994 000049D4 5F                  <1> 	POP	eDI
  4995 000049D5 C3                  <1> 	RETn				; ZERO FLAG IS SET
  4996                              <1> 
  4997                              <1> ;CMD_TIMEOUT:
  4998                              <1> ;	MOV	byte [DISK_STATUS1],BAD_CNTLR
  4999                              <1> ;COMMAND4:
  5000                              <1> ;	POP	BX
  5001                              <1> ;	CMP	[DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5002                              <1> ;	RETn
  5003                              <1> 
  5004                              <1> ;----------------------------------------
  5005                              <1> ;	WAIT FOR INTERRUPT		:
  5006                              <1> ;----------------------------------------
  5007                              <1> ;WAIT:
  5008                              <1> _WAIT:
  5009 000049D6 FB                  <1> 	STI				; MAKE SURE INTERRUPTS ARE ON
  5010                              <1> 	;SUB	CX,CX			; SET INITIAL DELAY BEFORE TEST
  5011                              <1> 	;CLC
  5012                              <1> 	;MOV	AX,9000H		; DEVICE WAIT INTERRUPT
  5013                              <1> 	;INT	15H
  5014                              <1> 	;JC	WT2			; DEVICE TIMED OUT
  5015                              <1> 	;MOV	BL,DELAY_1		; SET DELAY COUNT
  5016                              <1> 
  5017                              <1> 	;mov	bl, WAIT_HDU_INT_HI
  5018                              <1> 	;; 21/02/2015
  5019                              <1> 	;;mov	bl, WAIT_HDU_INT_HI + 1
  5020                              <1> 	;;mov	cx, WAIT_HDU_INT_LO
  5021 000049D7 B915160500          <1> 	mov	ecx, WAIT_HDU_INT_LH
  5022                              <1> 					; (AWARD BIOS -> WAIT_FOR_MEM)
  5023                              <1> ;-----	WAIT LOOP
  5024                              <1> 
  5025                              <1> WT1:	
  5026                              <1> 	;TEST	byte [HF_INT_FLAG],80H	; TEST FOR INTERRUPT
  5027 000049DC F605[73420100]C0    <1> 	test 	byte [HF_INT_FLAG],0C0h
  5028                              <1> 	;LOOPZ	WT1
  5029 000049E3 7517                <1> 	JNZ	short WT3		; INTERRUPT--LETS GO
  5030                              <1> 	;DEC	BL
  5031                              <1> 	;JNZ	short WT1		; KEEP TRYING FOR A WHILE
  5032                              <1> 
  5033                              <1> WT1_hi:
  5034 000049E5 E461                <1> 	in	al, SYS1 ; 61h (PORT_B)	; wait for lo to hi
  5035 000049E7 A810                <1> 	test	al, 10h			; transition on memory
  5036 000049E9 75FA                <1> 	jnz	short WT1_hi		; refresh.
  5037                              <1> WT1_lo:
  5038 000049EB E461                <1> 	in	al, SYS1 		; 061h (PORT_B)	
  5039 000049ED A810                <1> 	test	al, 10h			
  5040 000049EF 74FA                <1> 	jz	short WT1_lo
  5041 000049F1 E2E9                <1> 	loop	WT1
  5042                              <1> 	;;or	bl, bl
  5043                              <1> 	;;jz	short WT2	
  5044                              <1> 	;;dec	bl
  5045                              <1> 	;;jmp	short WT1
  5046                              <1> 	;dec	bl
  5047                              <1> 	;jnz	short WT1	
  5048                              <1> 
  5049 000049F3 C605[7B420100]80    <1> WT2:	MOV	byte [DISK_STATUS1],TIME_OUT ; REPORT TIME OUT ERROR
  5050 000049FA EB0E                <1> 	JMP	SHORT WT4
  5051 000049FC C605[7B420100]00    <1> WT3:	MOV	byte [DISK_STATUS1],0
  5052 00004A03 C605[73420100]00    <1> 	MOV	byte [HF_INT_FLAG],0
  5053 00004A0A 803D[7B420100]00    <1> WT4:	CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5054 00004A11 C3                  <1> 	RETn
  5055                              <1> 
  5056                              <1> ;----------------------------------------
  5057                              <1> ;	WAIT FOR CONTROLLER NOT BUSY	:
  5058                              <1> ;----------------------------------------
  5059                              <1> NOT_BUSY:
  5060 00004A12 FB                  <1> 	STI				; MAKE SURE INTERRUPTS ARE ON
  5061                              <1> 	;PUSH	eBX
  5062                              <1> 	;SUB	CX,CX			; SET INITIAL DELAY BEFORE TEST
  5063 00004A13 668B15[485C0000]    <1> 	mov	DX, [HF_PORT]
  5064 00004A1A 80C207              <1> 	add	dl, 7			; Status port (HF_PORT+7)
  5065                              <1> 	;MOV	BL,DELAY_1
  5066                              <1> 					; wait for 10 seconds
  5067                              <1> 	;mov 	cx, WAIT_HDU_INT_LO	; 1615h
  5068                              <1> 	;;mov 	bl, WAIT_HDU_INT_HI	;   05h
  5069                              <1> 	;mov	bl, WAIT_HDU_INT_HI + 1
  5070 00004A1D B915160500          <1> 	mov	ecx, WAIT_HDU_INT_LH  ; 21/02/2015
  5071                              <1> 	;
  5072                              <1> ;;      mov     byte [wait_count], 0    ; Reset wait counter
  5073                              <1> NB1:	
  5074 00004A22 EC                  <1> 	IN	AL,DX			; CHECK STATUS
  5075                              <1> 	;TEST	AL,ST_BUSY
  5076 00004A23 2480                <1> 	and	al, ST_BUSY
  5077                              <1> 	;LOOPNZ	NB1
  5078 00004A25 7410                <1> 	JZ	short NB2		; NOT BUSY--LETS GO
  5079                              <1> 	;DEC	BL			
  5080                              <1> 	;JNZ	short NB1		; KEEP TRYING FOR A WHILE
  5081                              <1> 
  5082 00004A27 E461                <1> NB1_hi: IN	AL,SYS1			; wait for hi to lo
  5083 00004A29 A810                <1> 	TEST	AL,010H			; transition on memory
  5084 00004A2B 75FA                <1> 	JNZ	SHORT NB1_hi		; refresh.
  5085 00004A2D E461                <1> NB1_lo: IN	AL,SYS1
  5086 00004A2F A810                <1> 	TEST	AL,010H
  5087 00004A31 74FA                <1> 	JZ	short NB1_lo
  5088 00004A33 E2ED                <1> 	LOOP	NB1
  5089                              <1> 	;dec	bl
  5090                              <1> 	;jnz	short NB1
  5091                              <1> 	;
  5092                              <1> ;;      cmp     byte [wait_count], 182  ; 10 seconds (182 timer ticks)
  5093                              <1> ;;	jb	short NB1
  5094                              <1> 	;
  5095                              <1> 	;MOV	[DISK_STATUS1],TIME_OUT	; REPORT TIME OUT ERROR
  5096                              <1> 	;JMP	SHORT NB3
  5097 00004A35 B080                <1> 	mov	al, TIME_OUT
  5098                              <1> NB2:	
  5099                              <1> 	;MOV	byte [DISK_STATUS1],0
  5100                              <1> ;NB3:	
  5101                              <1> 	;POP	eBX
  5102 00004A37 A2[7B420100]        <1> 	mov	[DISK_STATUS1], al	;;; will be set after return
  5103                              <1> 	;CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5104 00004A3C 08C0                <1> 	or	al, al			; (zf = 0 --> timeout)
  5105 00004A3E C3                  <1> 	RETn
  5106                              <1> 
  5107                              <1> ;----------------------------------------
  5108                              <1> ;	WAIT FOR DATA REQUEST		:
  5109                              <1> ;----------------------------------------
  5110                              <1> WAIT_DRQ:
  5111                              <1> 	;MOV	CX,DELAY_3
  5112                              <1> 	;MOV	DX,HF_PORT+7
  5113 00004A3F 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  5114 00004A46 80C207              <1> 	add	dl, 7
  5115                              <1> 	;;MOV	bl, WAIT_HDU_DRQ_HI	; 0
  5116                              <1> 	;MOV	cx, WAIT_HDU_DRQ_LO	; 1000 (30 milli seconds)
  5117                              <1> 					; (but it is written as 2000
  5118                              <1> 					; micro seconds in ATORGS.ASM file
  5119                              <1> 					; of Award Bios - 1999, D1A0622)
  5120 00004A49 B9E8030000          <1> 	mov 	ecx, WAIT_HDU_DRQ_LH ; 21/02/2015 
  5121 00004A4E EC                  <1> WQ_1:	IN	AL,DX			; GET STATUS
  5122 00004A4F A808                <1> 	TEST	AL,ST_DRQ		; WAIT FOR DRQ
  5123 00004A51 7516                <1> 	JNZ	short WQ_OK
  5124                              <1> 	;LOOP	WQ_1			; KEEP TRYING FOR A SHORT WHILE
  5125                              <1> WQ_hi:	
  5126 00004A53 E461                <1> 	IN	AL,SYS1			; wait for hi to lo
  5127 00004A55 A810                <1> 	TEST	AL,010H			; transition on memory
  5128 00004A57 75FA                <1> 	JNZ	SHORT WQ_hi		; refresh.
  5129 00004A59 E461                <1> WQ_lo:  IN      AL,SYS1
  5130 00004A5B A810                <1> 	TEST	AL,010H
  5131 00004A5D 74FA                <1> 	JZ	SHORT WQ_lo
  5132 00004A5F E2ED                <1> 	LOOP	WQ_1
  5133                              <1> 
  5134 00004A61 C605[7B420100]80    <1>         MOV     byte [DISK_STATUS1],TIME_OUT ; ERROR
  5135 00004A68 F9                  <1> 	STC
  5136                              <1> WQ_OK:
  5137 00004A69 C3                  <1> 	RETn
  5138                              <1> ;WQ_OK:	;CLC
  5139                              <1> ;	RETn
  5140                              <1> 
  5141                              <1> ;----------------------------------------
  5142                              <1> ;	CHECK FIXED DISK STATUS 	:
  5143                              <1> ;----------------------------------------
  5144                              <1> CHECK_STATUS:
  5145 00004A6A E813000000          <1> 	CALL	CHECK_ST		; CHECK THE STATUS BYTE
  5146 00004A6F 7509                <1> 	JNZ	short CHECK_S1		; AN ERROR WAS FOUND
  5147 00004A71 A801                <1> 	TEST	AL,ST_ERROR		; WERE THERE ANY OTHER ERRORS
  5148 00004A73 7405                <1> 	JZ	short CHECK_S1		; NO ERROR REPORTED
  5149 00004A75 E849000000          <1> 	CALL	CHECK_ER		; ERROR REPORTED
  5150                              <1> CHECK_S1:
  5151 00004A7A 803D[7B420100]00    <1> 	CMP	byte [DISK_STATUS1],0 	; SET STATUS FOR CALLER
  5152 00004A81 C3                  <1> 	RETn
  5153                              <1> 
  5154                              <1> ;----------------------------------------
  5155                              <1> ;	CHECK FIXED DISK STATUS BYTE	:
  5156                              <1> ;----------------------------------------
  5157                              <1> CHECK_ST:
  5158                              <1> 	;MOV	DX,HF_PORT+7		; GET THE STATUS
  5159 00004A82 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]
  5160 00004A89 80C207              <1> 	add	dl, 7
  5161                              <1> 	
  5162                              <1> 	; 17/02/2016
  5163                              <1> 	;(http://wiki.osdev.org/ATA_PIO_Mode)
  5164                              <1> 	;"delay 400ns to allow drive to set new values of BSY and DRQ"
  5165 00004A8C EC                  <1> 	IN	AL,DX
  5166                              <1> 	;in	al, dx ; 100ns
  5167                              <1> 	;in	al, dx ; 100ns
  5168                              <1>  	;in	al, dx ; 100ns
  5169                              <1> 	NEWIODELAY ; 18/02/2016 (AWARD BIOS - 1999, 'CKST' in AHSDK.ASM)
  5169 00004A8D E6EB                <2>  out 0ebh,al
  5170                              <1> 	;
  5171 00004A8F A2[71420100]        <1> 	MOV	[HF_STATUS],AL
  5172 00004A94 B400                <1> 	MOV	AH,0
  5173 00004A96 A880                <1> 	TEST	AL,ST_BUSY		; IF STILL BUSY
  5174 00004A98 751A                <1> 	JNZ	short CKST_EXIT		;  REPORT OK
  5175 00004A9A B4CC                <1> 	MOV	AH,WRITE_FAULT
  5176 00004A9C A820                <1> 	TEST	AL,ST_WRT_FLT		; CHECK FOR WRITE FAULT
  5177 00004A9E 7514                <1> 	JNZ	short CKST_EXIT
  5178 00004AA0 B4AA                <1> 	MOV	AH,NOT_RDY
  5179 00004AA2 A840                <1> 	TEST	AL,ST_READY		; CHECK FOR NOT READY
  5180 00004AA4 740E                <1> 	JZ	short CKST_EXIT
  5181 00004AA6 B440                <1> 	MOV	AH,BAD_SEEK
  5182 00004AA8 A810                <1> 	TEST	AL,ST_SEEK_COMPL	; CHECK FOR SEEK NOT COMPLETE
  5183 00004AAA 7408                <1> 	JZ	short CKST_EXIT
  5184 00004AAC B411                <1> 	MOV	AH,DATA_CORRECTED
  5185 00004AAE A804                <1> 	TEST	AL,ST_CORRCTD		; CHECK FOR CORRECTED ECC
  5186 00004AB0 7502                <1> 	JNZ	short CKST_EXIT
  5187 00004AB2 B400                <1> 	MOV	AH,0
  5188                              <1> CKST_EXIT:
  5189 00004AB4 8825[7B420100]      <1> 	MOV	[DISK_STATUS1],AH	; SET ERROR FLAG
  5190 00004ABA 80FC11              <1> 	CMP	AH,DATA_CORRECTED	; KEEP GOING WITH DATA CORRECTED
  5191 00004ABD 7403                <1> 	JZ	short CKST_EX1
  5192 00004ABF 80FC00              <1> 	CMP	AH,0
  5193                              <1> CKST_EX1:
  5194 00004AC2 C3                  <1> 	RETn
  5195                              <1> 
  5196                              <1> ;----------------------------------------
  5197                              <1> ;	CHECK FIXED DISK ERROR REGISTER :
  5198                              <1> ;----------------------------------------
  5199                              <1> CHECK_ER:
  5200                              <1> 	;MOV	DX, HF_PORT+1		; GET THE ERROR REGISTER
  5201 00004AC3 668B15[485C0000]    <1> 	mov	dx, [HF_PORT]		;
  5202 00004ACA FEC2                <1> 	inc	dl
  5203 00004ACC EC                  <1> 	IN	AL,DX
  5204 00004ACD A2[72420100]        <1> 	MOV	[HF_ERROR],AL
  5205 00004AD2 53                  <1> 	PUSH	eBX ; 21/02/2015
  5206 00004AD3 B908000000          <1> 	MOV	eCX,8			; TEST ALL 8 BITS
  5207 00004AD8 D0E0                <1> CK1:	SHL	AL,1			; MOVE NEXT ERROR BIT TO CARRY
  5208 00004ADA 7202                <1> 	JC	short CK2		; FOUND THE ERROR
  5209 00004ADC E2FA                <1> 	LOOP	CK1			; KEEP TRYING
  5210 00004ADE BB[3C5C0000]        <1> CK2:	MOV	eBX, ERR_TBL		; COMPUTE ADDRESS OF
  5211 00004AE3 01CB                <1> 	ADD	eBX,eCX			; ERROR CODE
  5212                              <1> 	;;MOV	AH,BYTE [CS:BX]		; GET ERROR CODE
  5213                              <1> 	;mov	ah, [bx]
  5214 00004AE5 8A23                <1> 	mov	ah, [ebx] ; 21/02/2015	
  5215 00004AE7 8825[7B420100]      <1> CKEX:	MOV	[DISK_STATUS1],AH	; SAVE ERROR CODE
  5216 00004AED 5B                  <1> 	POP	eBX
  5217 00004AEE 80FC00              <1> 	CMP	AH,0
  5218 00004AF1 C3                  <1> 	RETn
  5219                              <1> 
  5220                              <1> ;--------------------------------------------------------
  5221                              <1> ; CHECK_DMA						:
  5222                              <1> ;  -CHECK ES:BX AND # SECTORS TO MAKE SURE THAT IT WILL :
  5223                              <1> ;   FIT WITHOUT SEGMENT OVERFLOW.			:
  5224                              <1> ;  -ES:BX HAS BEEN REVISED TO THE FORMAT SSSS:000X	:
  5225                              <1> ;  -OK IF # SECTORS < 80H (7FH IF LONG READ OR WRITE)	:
  5226                              <1> ;  -OK IF # SECTORS = 80H (7FH) AND BX <= 00H (04H)	:
  5227                              <1> ;  -ERROR OTHERWISE					:
  5228                              <1> ;--------------------------------------------------------
  5229                              <1> CHECK_DMA:
  5230 00004AF2 6650                <1> 	PUSH	AX			; SAVE REGISTERS
  5231 00004AF4 66B80080            <1> 	MOV	AX,8000H		; AH = MAX # SECTORS AL = MAX OFFSET
  5232 00004AF8 F645FE02            <1>         TEST    byte [CMD_BLOCK+6],ECC_MODE
  5233 00004AFC 7404                <1> 	JZ	short CKD1
  5234 00004AFE 66B8047F            <1> 	MOV	AX,7F04H		; ECC IS 4 MORE BYTES
  5235 00004B02 3A65F9              <1> CKD1:	CMP	AH, [CMD_BLOCK+1] 	; NUMBER OF SECTORS
  5236 00004B05 7706                <1> 	JA	short CKDOK		; IT WILL FIT
  5237 00004B07 7208                <1> 	JB	short CKDERR		; TOO MANY
  5238 00004B09 38D8                <1> 	CMP	AL,BL			; CHECK OFFSET ON MAX SECTORS
  5239 00004B0B 7204                <1> 	JB	short CKDERR		; ERROR
  5240 00004B0D F8                  <1> CKDOK:	CLC				; CLEAR CARRY
  5241 00004B0E 6658                <1> 	POP	AX
  5242 00004B10 C3                  <1> 	RETn				; NORMAL RETURN
  5243 00004B11 F9                  <1> CKDERR: STC				; INDICATE ERROR
  5244 00004B12 C605[7B420100]09    <1>         MOV     byte [DISK_STATUS1],DMA_BOUNDARY
  5245 00004B19 6658                <1> 	POP	AX
  5246 00004B1B C3                  <1> 	RETn
  5247                              <1> 
  5248                              <1> ;----------------------------------------
  5249                              <1> ;	SET UP ES:BX-> DISK PARMS	:
  5250                              <1> ;----------------------------------------
  5251                              <1> 					
  5252                              <1> ; INPUT -> DL = 0 based drive number
  5253                              <1> ; OUTPUT -> ES:BX = disk parameter table address
  5254                              <1> 
  5255                              <1> GET_VEC:
  5256                              <1> 	;SUB	AX,AX			; GET DISK PARAMETER ADDRESS
  5257                              <1> 	;MOV	ES,AX
  5258                              <1> 	;TEST	DL,1
  5259                              <1> 	;JZ	short GV_0
  5260                              <1> ;	LES	BX,[HF1_TBL_VEC] 	; ES:BX -> DRIVE PARAMETERS
  5261                              <1> ;	JMP	SHORT GV_EXIT
  5262                              <1> ;GV_0:
  5263                              <1> ;	LES	BX,[HF_TBL_VEC]		; ES:BX -> DRIVE PARAMETERS
  5264                              <1> ;
  5265                              <1> 	;xor	bh, bh
  5266 00004B1C 31DB                <1> 	xor	ebx, ebx
  5267 00004B1E 88D3                <1> 	mov	bl, dl
  5268                              <1> 	;;02/01/2015
  5269                              <1> 	;;shl	bl, 1			; port address offset
  5270                              <1> 	;;mov	ax, [bx+hd_ports]	; Base port address (1F0h, 170h)
  5271                              <1> 	;;shl	bl, 1			; dpt pointer offset
  5272 00004B20 C0E302              <1> 	shl	bl, 2	;;
  5273                              <1> 	;add	bx, HF_TBL_VEC		; Disk parameter table pointer
  5274 00004B23 81C3[80420100]      <1> 	add	ebx, HF_TBL_VEC ; 21/02/2015
  5275                              <1> 	;push	word [bx+2]		; dpt segment
  5276                              <1> 	;pop	es
  5277                              <1> 	;mov	bx, [bx]		; dpt offset
  5278 00004B29 8B1B                <1> 	mov	ebx, [ebx]		
  5279                              <1> ;GV_EXIT:
  5280 00004B2B C3                  <1> 	RETn
  5281                              <1> 
  5282                              <1> hdc1_int: ; 21/02/2015
  5283                              <1> ;--- HARDWARE INT 76H -- ( IRQ LEVEL  14 ) ----------------------
  5284                              <1> ;								:
  5285                              <1> ;	FIXED DISK INTERRUPT ROUTINE				:
  5286                              <1> ;								:
  5287                              <1> ;----------------------------------------------------------------
  5288                              <1> 
  5289                              <1> ; 22/12/2014
  5290                              <1> ; IBM PC-XT Model 286 System BIOS Source Code - DISK.ASM (HD_INT)
  5291                              <1> ;	 '11/15/85'
  5292                              <1> ; AWARD BIOS 1999 (D1A0622) 
  5293                              <1> ;	Source Code - ATORGS.ASM (INT_HDISK, INT_HDISK1)
  5294                              <1> 
  5295                              <1> ;int_76h:
  5296                              <1> HD_INT:
  5297 00004B2C 6650                <1> 	PUSH	AX
  5298 00004B2E 1E                  <1> 	PUSH	DS
  5299                              <1> 	;CALL	DDS
  5300                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5301 00004B2F 66B81000            <1> 	mov	ax, KDATA
  5302 00004B33 8ED8                <1> 	mov 	ds, ax
  5303                              <1> 	;
  5304                              <1> 	;;MOV	@HF_INT_FLAG,0FFH	; ALL DONE
  5305                              <1>         ;mov     byte [CS:HF_INT_FLAG], 0FFh
  5306 00004B35 C605[73420100]FF    <1> 	mov	byte [HF_INT_FLAG], 0FFh
  5307                              <1> 	;
  5308 00004B3C 6652                <1> 	push	dx
  5309 00004B3E 66BAF701            <1> 	mov	dx, HDC1_BASEPORT+7	; Status Register (1F7h)
  5310                              <1> 					; Clear Controller
  5311                              <1> Clear_IRQ1415:				; (Award BIOS - 1999)
  5312 00004B42 EC                  <1> 	in	al, dx			;
  5313 00004B43 665A                <1> 	pop	dx
  5314                              <1> 	NEWIODELAY
  5314 00004B45 E6EB                <2>  out 0ebh,al
  5315                              <1> 	;
  5316 00004B47 B020                <1> 	MOV	AL,EOI			; NON-SPECIFIC END OF INTERRUPT
  5317 00004B49 E6A0                <1> 	OUT	INTB00,AL		; FOR CONTROLLER #2
  5318                              <1> 	;JMP	$+2			; WAIT
  5319                              <1> 	NEWIODELAY
  5319 00004B4B E6EB                <2>  out 0ebh,al
  5320 00004B4D E620                <1> 	OUT	INTA00,AL		; FOR CONTROLLER #1
  5321 00004B4F 1F                  <1> 	POP	DS
  5322                              <1> 	;STI				; RE-ENABLE INTERRUPTS
  5323                              <1> 	;MOV	AX,9100H		; DEVICE POST
  5324                              <1> 	;INT	15H			;  INTERRUPT
  5325                              <1> irq15_iret: ; 25/02/2015
  5326 00004B50 6658                <1> 	POP	AX
  5327 00004B52 CF                  <1> 	IRETd				; RETURN FROM INTERRUPT
  5328                              <1> 
  5329                              <1> hdc2_int: ; 21/02/2015
  5330                              <1> ;++++ HARDWARE INT 77H ++ ( IRQ LEVEL  15 ) +++++++++++++++++++++
  5331                              <1> ;								:
  5332                              <1> ;	FIXED DISK INTERRUPT ROUTINE				:
  5333                              <1> ;								:
  5334                              <1> ;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  5335                              <1> 
  5336                              <1> ;int_77h:
  5337                              <1> HD1_INT:
  5338 00004B53 6650                <1> 	PUSH	AX
  5339                              <1> 	; Check if that is a spurious IRQ (from slave PIC)
  5340                              <1> 	; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  5341 00004B55 B00B                <1> 	mov	al, 0Bh  ; In-Service Register
  5342 00004B57 E6A0                <1> 	out	0A0h, al
  5343 00004B59 EB00                <1>         jmp short $+2
  5344 00004B5B EB00                <1> 	jmp short $+2
  5345 00004B5D E4A0                <1> 	in	al, 0A0h
  5346 00004B5F 2480                <1> 	and 	al, 80h ; bit 7 (is it real IRQ 15 or fake?)
  5347 00004B61 74ED                <1> 	jz	short irq15_iret ; Fake (spurious)IRQ, do not send EOI)
  5348                              <1> 	;
  5349 00004B63 1E                  <1> 	PUSH	DS
  5350                              <1> 	;CALL	DDS
  5351                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5352 00004B64 66B81000            <1> 	mov	ax, KDATA
  5353 00004B68 8ED8                <1> 	mov 	ds, ax
  5354                              <1> 	;
  5355                              <1> 	;;MOV	@HF_INT_FLAG,0FFH	; ALL DONE
  5356                              <1>         ;or      byte [CS:HF_INT_FLAG],0C0h 
  5357 00004B6A 800D[73420100]C0    <1> 	or	byte [HF_INT_FLAG], 0C0h
  5358                              <1> 	;
  5359 00004B71 6652                <1> 	push	dx
  5360 00004B73 66BA7701            <1> 	mov	dx, HDC2_BASEPORT+7	; Status Register (177h)
  5361                              <1> 					; Clear Controller (Award BIOS 1999)
  5362 00004B77 EBC9                <1> 	jmp	short Clear_IRQ1415
  5363                              <1> 
  5364                              <1> 
  5365                              <1> ;%include 'diskdata.inc' ; 11/03/2015
  5366                              <1> ;%include 'diskbss.inc' ; 11/03/2015
  5367                              <1> 
  5368                              <1> 
  5369                              <1> ;////////////////////////////////////////////////////////////////////
  5370                              <1> ;; END OF DISK I/O SYTEM ///
  2158                                  %include 'memory.s'  ; 09/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - memory.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 26/03/2017
     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> ; 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> ;
    61                              <1> ;; Retro Unix 386 v1 - paging method/principles
    62                              <1> ;;
    63                              <1> ;; 10/10/2014
    64                              <1> ;; RETRO UNIX 386 v1 - PAGING METHOD/PRINCIPLES
    65                              <1> ;;
    66                              <1> ;; KERNEL PAGE MAP: 1 to 1 physical memory page map
    67                              <1> ;;	(virtual address = physical address)
    68                              <1> ;; KERNEL PAGE TABLES:
    69                              <1> ;;	Kernel page directory and all page tables are
    70                              <1> ;;	on memory as initialized, as equal to physical memory
    71                              <1> ;;	layout. Kernel pages can/must not be swapped out/in.
    72                              <1> ;;
    73                              <1> ;;	what for: User pages may be swapped out, when accessing
    74                              <1> ;;	a page in kernel/system mode, if it would be swapped out,
    75                              <1> ;;	kernel would have to swap it in! But it is also may be
    76                              <1> ;;	in use by a user process. (In system/kernel mode
    77                              <1> ;;	kernel can access all memory pages even if they are
    78                              <1> ;;	reserved/allocated for user processes. Swap out/in would
    79                              <1> ;;	cause conflicts.) 
    80                              <1> ;;	
    81                              <1> ;;	As result of these conditions,
    82                              <1> ;;	all kernel pages must be initialized as equal to 
    83                              <1> ;;	physical layout for preventing page faults. 
    84                              <1> ;;	Also, calling "allocate page" procedure after
    85                              <1> ;;	a page fault can cause another page fault (double fault)
    86                              <1> ;;	if all kernel page tables would not be initialized.
    87                              <1> ;;
    88                              <1> ;;	[first_page] = Beginning of users space, as offset to 
    89                              <1> ;;	memory allocation table. (double word aligned)
    90                              <1> ;;
    91                              <1> ;;	[next_page] = first/next free space to be searched
    92                              <1> ;;	as offset to memory allocation table. (dw aligned)
    93                              <1> ;;
    94                              <1> ;;	[last_page] = End of memory (users space), as offset
    95                              <1> ;;	to memory allocation table. (double word aligned)
    96                              <1> ;;
    97                              <1> ;; USER PAGE TABLES:
    98                              <1> ;;	Demand paging (& 'copy on write' allocation method) ...
    99                              <1> ;;		'ready only' marked copies of the 
   100                              <1> ;;		parent process's page table entries (for
   101                              <1> ;;		same physical memory).
   102                              <1> ;;		(A page will be copied to a new page after
   103                              <1> ;;		 if it causes R/W page fault.)
   104                              <1> ;;
   105                              <1> ;;	Every user process has own (different)
   106                              <1> ;;	page directory and page tables.	
   107                              <1> ;;
   108                              <1> ;;	Code starts at virtual address 0, always.
   109                              <1> ;;	(Initial value of EIP is 0 in user mode.)
   110                              <1> ;;	(Programs can be written/developed as simple
   111                              <1> ;;	 flat memory programs.)
   112                              <1> ;;
   113                              <1> ;; MEMORY ALLOCATION STRATEGY:
   114                              <1> ;;	Memory page will be allocated by kernel only 
   115                              <1> ;;		(in kernel/system mode only).
   116                              <1> ;;	* After a
   117                              <1> ;;	  - 'not present' page fault
   118                              <1> ;;	  - 'writing attempt on read only page' page fault 	 	
   119                              <1> ;;	* For loading (opening, reading) a file or disk/drive
   120                              <1> ;;	* As responce to 'allocate additional memory blocks' 
   121                              <1> ;;	  request by running process.
   122                              <1> ;;	* While creating a process, allocating a new buffer,
   123                              <1> ;;	  new page tables etc.
   124                              <1> ;;
   125                              <1> ;;	At first,
   126                              <1> ;;	- 'allocate page' procedure will be called;
   127                              <1> ;,	   if it will return with a valid (>0) physical address
   128                              <1> ;;	   (that means the relevant M.A.T. bit has been RESET)	
   129                              <1> ;;	   relevant memory page/block will be cleared (zeroed).
   130                              <1> ;;	- 'allocate page' will be called for allocating page
   131                              <1> ;;	   directory, page table and running space (data/code).
   132                              <1> ;;	- every successful 'allocate page' call will decrease
   133                              <1> ;;	  'free_pages' count (pointer).
   134                              <1> ;;	- 'out of (insufficient) memory error' will be returned
   135                              <1> ;;	  if 'free_pages' points to a ZERO.
   136                              <1> ;;	- swapping out and swapping in (if it is not a new page)
   137                              <1> ;;	  procedures will be called as responce to 'out of memory'
   138                              <1> ;;	  error except errors caused by attribute conflicts.
   139                              <1> ;;	 (swapper functions)	 
   140                              <1> ;;					
   141                              <1> ;;	At second,
   142                              <1> ;;	- page directory entry will be updated then page table
   143                              <1> ;;	  entry will be updated.		
   144                              <1> ;;
   145                              <1> ;; MEMORY ALLOCATION TABLE FORMAT:
   146                              <1> ;;	- M.A.T. has a size according to available memory as
   147                              <1> ;;	  follows:
   148                              <1> ;;		  - 1 (allocation) bit per 1 page (4096 bytes)
   149                              <1> ;;		  - a bit with value of 0 means allocated page
   150                              <1> ;;		  - a bit with value of 1 means a free page
   151                              <1> ;,	- 'free_pages' pointer holds count of free pages
   152                              <1> ;;	  depending on M.A.T.
   153                              <1> ;;		(NOTE: Free page count will not be checked
   154                              <1> ;;		again -on M.A.T.- after initialization. 
   155                              <1> ;;		Kernel will trust on initial count.)
   156                              <1> ;,	- 'free_pages' count will be decreased by allocation
   157                              <1> ;;	  and it will be increased by deallocation procedures.
   158                              <1> ;;	
   159                              <1> ;;	- Available memory will be calculated during
   160                              <1> ;;	  the kernel's initialization stage (in real mode).
   161                              <1> ;;	  Memory allocation table and kernel page tables 
   162                              <1> ;;	  will be formatted/sized as result of available
   163                              <1> ;;	  memory calculation before paging is enabled.
   164                              <1> ;;
   165                              <1> ;; For 4GB Available/Present Memory: (max. possible memory size)
   166                              <1> ;;	- Memory Allocation Table size will be 128 KB.
   167                              <1> ;;	- Memory allocation for kernel page directory size 
   168                              <1> ;;	  is always 4 KB. (in addition to total allocation size
   169                              <1> ;;	  for page tables)
   170                              <1> ;;	- Memory allocation for kernel page tables (1024 tables)
   171                              <1> ;;	  is 4 MB (1024*4*1024 bytes).
   172                              <1> ;;	- User (available) space will be started 
   173                              <1> ;;	  at 6th MB of the memory (after 1MB+4MB).
   174                              <1> ;;	- The first 640 KB is for kernel's itself plus
   175                              <1> ;;	  memory allocation table and kernel's page directory
   176                              <1> ;;	  (D0000h-EFFFFh may be used as kernel space...)	
   177                              <1> ;;	- B0000h to B7FFFh address space (32 KB) will be used
   178                              <1> ;; 	  for buffers.
   179                              <1> ;;	- ROMBIOS, VIDEO BUFFER and VIDEO ROM space are reserved.
   180                              <1> ;,	  (A0000h-AFFFFh, C0000h-CFFFFh, F0000h-FFFFFh)
   181                              <1> ;;	- Kernel page tables start at 100000h (2nd MB)
   182                              <1> ;;
   183                              <1> ;; For 1GB Available Memory:
   184                              <1> ;;	- Memory Allocation Table size will be 32 KB.
   185                              <1> ;;	- Memory allocation for kernel page directory size 
   186                              <1> ;;	  is always 4 KB. (in addition to total allocation size
   187                              <1> ;;	  for page tables)
   188                              <1> ;;	- Memory allocation for kernel page tables (256 tables)
   189                              <1> ;;	  is 1 MB (256*4*1024 bytes).
   190                              <1> ;;	- User (available) space will be started 
   191                              <1> ;;	  at 3th MB of the memory (after 1MB+1MB).
   192                              <1> ;;	- The first 640 KB is for kernel's itself plus
   193                              <1> ;;	  memory allocation table and kernel's page directory
   194                              <1> ;;	  (D0000h-EFFFFh may be used as kernel space...)	
   195                              <1> ;;	- B0000h to B7FFFh address space (32 KB) will be used
   196                              <1> ;; 	  for buffers.
   197                              <1> ;;	- ROMBIOS, VIDEO BUFFER and VIDEO ROM space are reserved.
   198                              <1> ;,	  (A0000h-AFFFFh, C0000h-CFFFFh, F0000h-FFFFFh)
   199                              <1> ;;	- Kernel page tables start at 100000h (2nd MB).	
   200                              <1> ;;
   201                              <1> ;;
   202                              <1> 
   203                              <1> 
   204                              <1> ;;************************************************************************************
   205                              <1> ;; 
   206                              <1> ;; RETRO UNIX 386 v1 - Paging (Method for Copy On Write paging principle)
   207                              <1> ;; DEMAND PAGING - PARENT&CHILD PAGE TABLE DUPLICATION PRINCIPLES (23/04/2015)
   208                              <1> 
   209                              <1> ;; Main factor: "sys fork" system call 
   210                              <1> ;;	
   211                              <1> ;; 		FORK
   212                              <1> ;;                      |----> parent - duplicated PTEs, read only pages
   213                              <1> ;;  writable pages ---->|
   214                              <1> ;;                      |----> child - duplicated PTEs, read only pages
   215                              <1> ;; 
   216                              <1> ;; AVL bit (0) of Page Table Entry is used as duplication sign 
   217                              <1> ;; 
   218                              <1> ;; AVL Bit 0 [PTE Bit 9] = 'Duplicated PTE belongs to child' sign/flag (if it is set)
   219                              <1> ;; Note: Dirty bit (PTE bit 6) may be used instead of AVL bit 0 (PTE bit 9)
   220                              <1> ;;       -while R/W bit is 0-. 
   221                              <1> ;; 
   222                              <1> ;; Duplicate page tables with writable pages (the 1st sys fork in the process):
   223                              <1> ;; # Parent's Page Table Entries are updated to point same pages as read only, 
   224                              <1> ;;   as duplicated PTE bit  -AVL bit 0, PTE bit 9- are reset/clear.
   225                              <1> ;; # Then Parent's Page Table is copied to Child's Page Table.
   226                              <1> ;; # Child's Page Table Entries are updated as duplicated child bit
   227                              <1> ;;   -AVL bit 0, PTE bit 9- is set.	  
   228                              <1> ;; 
   229                              <1> ;; Duplicate page tables with read only pages (several sys fork system calls):
   230                              <1> ;; # Parent's read only pages are copied to new child pages. 
   231                              <1> ;;   Parent's PTE attributes are not changed.
   232                              <1> ;;   (Because, there is another parent-child fork before this fork! We must not
   233                              <1> ;;    destroy/mix previous fork result).
   234                              <1> ;; # Child's Page Table Entries (which are corresponding to Parent's 
   235                              <1> ;;   read only pages) are set as writable (while duplicated PTE bit is clear). 
   236                              <1> ;; # Parent's PTEs with writable page attribute are updated to point same pages 
   237                              <1> ;;   as read only, (while) duplicated PTE bit is reset (clear).
   238                              <1> ;; # Parent's Page Table Entries (with writable page attribute) are duplicated 
   239                              <1> ;;   as Child's Page Table Entries without copying actual page.
   240                              <1> ;; # Child 's Page Table Entries (which are corresponding to Parent's writable 
   241                              <1> ;;   pages) are updated as duplicated PTE bit (AVL bit 0, PTE bit 9- is set.
   242                              <1> ;; 
   243                              <1> ;; !? WHAT FOR (duplication after duplication):
   244                              <1> ;; In UNIX method for sys fork (a typical 'fork' application in /etc/init)
   245                              <1> ;; program/executable code continues from specified location as child process, 
   246                              <1> ;; returns back previous code location as parent process, every child after 
   247                              <1> ;; every sys fork uses last image of code and data just prior the fork.
   248                              <1> ;; Even if the parent code changes data, the child will not see the changed data 
   249                              <1> ;; after the fork. In Retro UNIX 8086 v1, parent's process segment (32KB)
   250                              <1> ;; was copied to child's process segment (all of code and data) according to
   251                              <1> ;; original UNIX v1 which copies all of parent process code and data -core- 
   252                              <1> ;; to child space -core- but swaps that core image -of child- on to disk.
   253                              <1> ;; If I (Erdogan Tan) would use a method of to copy parent's core
   254                              <1> ;; (complete running image of parent process) to the child process; 
   255                              <1> ;; for big sizes, i would force Retro UNIX 386 v1 to spend many memory pages 
   256                              <1> ;; and times only for a sys fork. (It would excessive reservation for sys fork,
   257                              <1> ;; because sys fork usually is prior to sys exec; sys exec always establishes
   258                              <1> ;; a new/fresh core -running space-, by clearing all code/data content). 
   259                              <1> ;; 'Read Only' page flag ensures page fault handler is needed only for a few write
   260                              <1> ;; attempts between sys fork and sys exec, not more... (I say so by thinking 
   261                              <1> ;; of "/etc/init" content, specially.) sys exec will clear page tables and
   262                              <1> ;; new/fresh pages will be used to load and run new executable/program.
   263                              <1> ;; That is what for i have preferred "copy on write", "duplication" method
   264                              <1> ;; for sharing same read only pages between parent and child processes.
   265                              <1> ;; That is a pitty i have to use new private flag (AVL bit 0, "duplicated PTE 
   266                              <1> ;; belongs to child" sign) for cooperation on duplicated pages between a parent 
   267                              <1> ;; and it's child processes; otherwise parent process would destroy data belongs
   268                              <1> ;; to its child or vice versa; or some pages would remain unclaimed 
   269                              <1> ;; -deallocation problem-.
   270                              <1> ;; Note: to prevent conflicts, read only pages must not be swapped out... 
   271                              <1> ;; 
   272                              <1> ;; WHEN PARENT TRIES TO WRITE IT'S READ ONLY (DUPLICATED) PAGE:
   273                              <1> ;; # Page fault handler will do those:
   274                              <1> ;;   - 'Duplicated PTE' flag (PTE bit 9) is checked (on the failed PTE).
   275                              <1> ;;   - If it is reset/clear, there is a child uses same page.
   276                              <1> ;;   - Parent's read only page -previous page- is copied to a new writable page. 
   277                              <1> ;;   - Parent's PTE is updated as writable page, as unique page (AVL=0)
   278                              <1> ;;   - (Page fault handler whill check this PTE later, if child process causes to
   279                              <1> ;;     page fault due to write attempt on read only page. Of course, the previous 
   280                              <1> ;;     read only page will be converted to writable and unique page which belongs
   281                              <1> ;;     to child process.)	
   282                              <1> ;; WHEN CHILD TRIES TO WRITE IT'S READ ONLY (DUPLICATED) PAGE:
   283                              <1> ;; # Page fault handler will do those:
   284                              <1> ;;   - 'Duplicated PTE' flag (PTE bit 9) is checked (on the failed PTE).
   285                              <1> ;;   - If it is set, there is a parent uses -or was using- same page.
   286                              <1> ;;   - Same PTE address within parent's page table is checked if it has same page
   287                              <1> ;;     address or not. 
   288                              <1> ;;   - If parent's PTE has same address, child will continue with a new writable page.
   289                              <1> ;;     Parent's PTE will point to same (previous) page as writable, unique (AVL=0).	
   290                              <1> ;;   - If parent's PTE has different address, child will continue with it's 
   291                              <1> ;;     own/same page but read only flag (0) will be changed to writable flag (1) and
   292                              <1> ;;     'duplicated PTE (belongs to child)' flag/sign will be cleared/reset. 	  	
   293                              <1> ;; 
   294                              <1> ;; NOTE: When a child process is terminated, read only flags of parent's page tables
   295                              <1> ;;       will be set as writable (and unique) in case of child process was using 
   296                              <1> ;;       same pages with duplicated child PTE sign... Depending on sys fork and 
   297                              <1> ;;       duplication method details, it is not possible multiple child processes
   298                              <1> ;;       were using same page with duplicated PTEs.
   299                              <1> ;; 
   300                              <1> ;;************************************************************************************   
   301                              <1> 
   302                              <1> ;; 08/10/2014
   303                              <1> ;; 11/09/2014 - Retro UNIX 386 v1 PAGING (further) draft
   304                              <1> ;;		by Erdogan Tan (Based on KolibriOS 'memory.inc')
   305                              <1> 
   306                              <1> ;; 'allocate_page' code is derived and modified from KolibriOS
   307                              <1> ;; 'alloc_page' procedure in 'memory.inc' 
   308                              <1> ;; (25/08/2014, Revision: 5057) file 
   309                              <1> ;; by KolibriOS Team (2004-2012)
   310                              <1> 
   311                              <1> allocate_page:
   312                              <1> 	; 01/07/2015
   313                              <1> 	; 05/05/2015
   314                              <1> 	; 30/04/2015
   315                              <1> 	; 16/10/2014
   316                              <1> 	; 08/10/2014
   317                              <1> 	; 09/09/2014 (Retro UNIX 386 v1 - beginning)
   318                              <1> 	;
   319                              <1> 	; INPUT -> none
   320                              <1> 	;
   321                              <1> 	; OUTPUT ->
   322                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
   323                              <1> 	;	(corresponding MEMORY ALLOCATION TABLE bit is RESET)
   324                              <1> 	;
   325                              <1> 	;	CF = 1 and EAX = 0 
   326                              <1> 	; 		   if there is not a free page to be allocated	
   327                              <1> 	;
   328                              <1> 	; Modified Registers -> none (except EAX)
   329                              <1> 	;
   330 00004B79 A1[E8410100]        <1> 	mov	eax, [free_pages]
   331 00004B7E 21C0                <1> 	and	eax, eax
   332 00004B80 7438                <1> 	jz	short out_of_memory
   333                              <1> 	;
   334 00004B82 53                  <1> 	push	ebx
   335 00004B83 51                  <1> 	push	ecx
   336                              <1> 	;
   337 00004B84 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table offset
   338 00004B89 89D9                <1> 	mov	ecx, ebx
   339                              <1>  				     ; NOTE: 32 (first_page) is initial
   340                              <1> 				     ; value of [next_page].
   341                              <1> 				     ; It points to the first available
   342                              <1> 				     ; page block for users (ring 3) ...	
   343                              <1> 				     ; (MAT offset 32 = 1024/32)	
   344                              <1> 				     ; (at the of the first 4 MB)		
   345 00004B8B 031D[EC410100]      <1> 	add	ebx, [next_page] ; Free page searching starts from here
   346                              <1> 				 ; next_free_page >> 5
   347 00004B91 030D[F0410100]      <1> 	add	ecx, [last_page] ; Free page searching ends here
   348                              <1> 				 ; (total_pages - 1) >> 5
   349                              <1> al_p_scan:
   350 00004B97 39CB                <1> 	cmp	ebx, ecx
   351 00004B99 770A                <1> 	ja	short al_p_notfound
   352                              <1> 	;
   353                              <1> 	; 01/07/2015
   354                              <1> 	; AMD64 Architecture Programmers Manual
   355                              <1> 	; Volume 3:
   356                              <1> 	; General-Purpose and System Instructions
   357                              <1> 	;
   358                              <1> 	; BSF - Bit Scan Forward
   359                              <1> 	;
   360                              <1> 	;   Searches the value in a register or a memory location
   361                              <1> 	;   (second operand) for the least-significant set bit. 
   362                              <1> 	;   If a set bit is found, the instruction clears the zero flag (ZF)
   363                              <1> 	;   and stores the index of the least-significant set bit in a destination
   364                              <1> 	;   register (first operand). If the second operand contains 0, 
   365                              <1> 	;   the instruction sets ZF to 1 and does not change the contents of the 
   366                              <1> 	;   destination register. The bit index is an unsigned offset from bit 0 
   367                              <1> 	;   of the searched value
   368                              <1> 	;
   369 00004B9B 0FBC03              <1> 	bsf	eax, [ebx] ; Scans source operand for first bit set (1).
   370                              <1> 			   ; Clear ZF if a bit is found set (1) and 
   371                              <1> 			   ; loads the destination with an index to
   372                              <1> 			   ; first set bit. (0 -> 31) 
   373                              <1> 			   ; Sets ZF to 1 if no bits are found set.
   374 00004B9E 7525                <1> 	jnz	short al_p_found ; ZF = 0 -> a free page has been found
   375                              <1> 			 ;
   376                              <1> 			 ; NOTE:  a Memory Allocation Table bit 
   377                              <1> 			 ;	  with value of 1 means 
   378                              <1> 			 ;	  the corresponding page is free 
   379                              <1> 			 ;	  (Retro UNIX 386 v1 feature only!)
   380 00004BA0 83C304              <1> 	add	ebx, 4
   381                              <1> 			 ; We return back for searching next page block
   382                              <1> 			 ; NOTE: [free_pages] is not ZERO; so, 
   383                              <1> 			 ;	 we always will find at least 1 free page here.
   384 00004BA3 EBF2                <1>         jmp     short al_p_scan
   385                              <1> 	;
   386                              <1> al_p_notfound:
   387 00004BA5 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   388 00004BAB 890D[EC410100]      <1> 	mov	[next_page], ecx ; next/first free page = last page 
   389                              <1> 				 ; (deallocate_page procedure will change it)
   390 00004BB1 31C0                <1> 	xor	eax, eax
   391 00004BB3 A3[E8410100]        <1> 	mov	[free_pages], eax ; 0
   392 00004BB8 59                  <1> 	pop	ecx
   393 00004BB9 5B                  <1> 	pop	ebx
   394                              <1> 	;
   395                              <1> out_of_memory:
   396 00004BBA E85B040000          <1> 	call	swap_out
   397 00004BBF 7325                <1> 	jnc	short al_p_ok  ; [free_pages] = 0, re-allocation by swap_out
   398                              <1> 	;
   399 00004BC1 29C0                <1> 	sub 	eax, eax ; 0
   400 00004BC3 F9                  <1> 	stc
   401 00004BC4 C3                  <1> 	retn
   402                              <1> 
   403                              <1> al_p_found:
   404 00004BC5 89D9                <1> 	mov	ecx, ebx
   405 00004BC7 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   406 00004BCD 890D[EC410100]      <1> 	mov	[next_page], ecx ; Set first free page searching start
   407                              <1> 				 ; address/offset (to the next)
   408 00004BD3 FF0D[E8410100]      <1>         dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
   409                              <1> 	;
   410 00004BD9 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
   411                              <1> 				 ; is copied into the Carry Flag and then cleared
   412                              <1> 				 ; in the destination.
   413                              <1> 				 ;
   414                              <1> 				 ; Reset the bit which is corresponding to the 
   415                              <1> 				 ; (just) allocated page.
   416                              <1> 	; 01/07/2015 (4*8 = 32, 1 allocation byte = 8 pages)	
   417 00004BDC C1E103              <1> 	shl	ecx, 3		 ; (page block offset * 32) + page index
   418 00004BDF 01C8                <1> 	add	eax, ecx	 ; = page number
   419 00004BE1 C1E00C              <1> 	shl	eax, 12		 ; physical address of the page (flat/real value)
   420                              <1> 	; EAX = physical address of memory page
   421                              <1> 	;
   422                              <1> 	; NOTE: The relevant page directory and page table entry will be updated
   423                              <1> 	;       according to this EAX value...
   424 00004BE4 59                  <1> 	pop	ecx
   425 00004BE5 5B                  <1> 	pop	ebx
   426                              <1> al_p_ok:
   427 00004BE6 C3                  <1> 	retn
   428                              <1> 
   429                              <1> 
   430                              <1> make_page_dir:
   431                              <1> 	; 18/04/2015
   432                              <1> 	; 12/04/2015
   433                              <1> 	; 23/10/2014
   434                              <1> 	; 16/10/2014
   435                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   436                              <1> 	;
   437                              <1> 	; INPUT ->
   438                              <1> 	;	none
   439                              <1> 	; OUTPUT ->
   440                              <1> 	;	(EAX = 0)
   441                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   442                              <1> 	;	cf = 0 ->
   443                              <1> 	;	u.pgdir = page directory (physical) address of the current
   444                              <1> 	;		  process/user.
   445                              <1> 	;
   446                              <1> 	; Modified Registers -> EAX
   447                              <1> 	;
   448 00004BE7 E88DFFFFFF          <1> 	call	allocate_page
   449 00004BEC 7216                <1> 	jc	short mkpd_error
   450                              <1> 	;
   451 00004BEE A3[545D0100]        <1> 	mov	[u.pgdir], eax    ; Page dir address for current user/process
   452                              <1> 				  ; (Physical address)
   453                              <1> clear_page:
   454                              <1> 	; 18/04/2015
   455                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   456                              <1> 	;
   457                              <1> 	; INPUT ->
   458                              <1> 	;	EAX = physical address of the page
   459                              <1> 	; OUTPUT ->
   460                              <1> 	;	all bytes of the page will be cleared
   461                              <1> 	;
   462                              <1> 	; Modified Registers -> none
   463                              <1> 	;
   464 00004BF3 57                  <1> 	push	edi
   465 00004BF4 51                  <1> 	push	ecx
   466 00004BF5 50                  <1> 	push	eax
   467 00004BF6 B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
   468 00004BFB 89C7                <1> 	mov	edi, eax
   469 00004BFD 31C0                <1> 	xor	eax, eax
   470 00004BFF F3AB                <1> 	rep	stosd
   471 00004C01 58                  <1> 	pop	eax
   472 00004C02 59                  <1> 	pop	ecx
   473 00004C03 5F                  <1> 	pop	edi
   474                              <1> mkpd_error:
   475                              <1> mkpt_error:
   476 00004C04 C3                  <1> 	retn
   477                              <1> 
   478                              <1> make_page_table:
   479                              <1> 	; 23/06/2015
   480                              <1> 	; 18/04/2015
   481                              <1> 	; 12/04/2015
   482                              <1> 	; 16/10/2014
   483                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   484                              <1> 	;
   485                              <1> 	; INPUT ->
   486                              <1> 	;	EBX = virtual (linear) address
   487                              <1> 	;	ECX = page table attributes (lower 12 bits)
   488                              <1> 	;	      (higher 20 bits must be ZERO)
   489                              <1> 	;	      (bit 0 must be 1)	 
   490                              <1> 	;	u.pgdir = page directory (physical) address
   491                              <1> 	; OUTPUT ->
   492                              <1> 	;	EDX = Page directory entry address
   493                              <1> 	;	EAX = Page table address
   494                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   495                              <1> 	;	cf = 0 -> page table address in the PDE (EDX)
   496                              <1> 	;
   497                              <1> 	; Modified Registers -> EAX, EDX
   498                              <1> 	;
   499 00004C05 E86FFFFFFF          <1> 	call	allocate_page
   500 00004C0A 72F8                <1> 	jc	short mkpt_error
   501 00004C0C E811000000          <1> 	call	set_pde	
   502 00004C11 EBE0                <1> 	jmp	short clear_page
   503                              <1> 
   504                              <1> make_page:
   505                              <1> 	; 24/07/2015
   506                              <1> 	; 23/06/2015 ; (Retro UNIX 386 v1 - beginning)
   507                              <1> 	;
   508                              <1> 	; INPUT ->
   509                              <1> 	;	EBX = virtual (linear) address
   510                              <1> 	;	ECX = page attributes (lower 12 bits)
   511                              <1> 	;	      (higher 20 bits must be ZERO)
   512                              <1> 	;	      (bit 0 must be 1)	 
   513                              <1> 	;	u.pgdir = page directory (physical) address
   514                              <1> 	; OUTPUT ->
   515                              <1> 	;	EBX = Virtual address
   516                              <1> 	;	(EDX = PTE value)
   517                              <1> 	;	EAX = Physical address
   518                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   519                              <1> 	;
   520                              <1> 	; Modified Registers -> EAX, EDX
   521                              <1> 	;
   522 00004C13 E861FFFFFF          <1> 	call	allocate_page
   523 00004C18 7207                <1> 	jc	short mkp_err
   524 00004C1A E821000000          <1> 	call	set_pte	
   525 00004C1F 73D2                <1> 	jnc	short clear_page ; 18/04/2015
   526                              <1> mkp_err:
   527 00004C21 C3                  <1> 	retn
   528                              <1> 
   529                              <1> 
   530                              <1> set_pde:	; Set page directory entry (PDE)
   531                              <1> 	; 20/07/2015
   532                              <1> 	; 18/04/2015
   533                              <1> 	; 12/04/2015
   534                              <1> 	; 23/10/2014
   535                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   536                              <1> 	;
   537                              <1> 	; INPUT ->
   538                              <1> 	;	EAX = physical address
   539                              <1> 	;	      (use present value if EAX = 0)
   540                              <1> 	;	EBX = virtual (linear) address
   541                              <1> 	;	ECX = page table attributes (lower 12 bits)
   542                              <1> 	;	      (higher 20 bits must be ZERO)
   543                              <1> 	;	      (bit 0 must be 1)	 
   544                              <1> 	;	u.pgdir = page directory (physical) address
   545                              <1> 	; OUTPUT ->
   546                              <1> 	;	EDX = PDE address
   547                              <1> 	;	EAX = page table address (physical)
   548                              <1> 	;	;(CF=1 -> Invalid page address)
   549                              <1> 	;
   550                              <1> 	; Modified Registers -> EDX
   551                              <1> 	;
   552 00004C22 89DA                <1> 	mov	edx, ebx
   553 00004C24 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22
   554 00004C27 C1E202              <1> 	shl	edx, 2 ; offset to page directory (1024*4)
   555 00004C2A 0315[545D0100]      <1> 	add	edx, [u.pgdir]
   556                              <1> 	;
   557 00004C30 21C0                <1> 	and	eax, eax
   558 00004C32 7506                <1> 	jnz	short spde_1
   559                              <1> 	;
   560 00004C34 8B02                <1> 	mov	eax, [edx]  ; old PDE value
   561                              <1> 	;test	al, 1
   562                              <1> 	;jz	short spde_2
   563 00004C36 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h  ; clear lower 12 bits
   564                              <1> spde_1:
   565                              <1> 	;and	cx, 0FFFh
   566 00004C3A 8902                <1> 	mov	[edx], eax
   567 00004C3C 66090A              <1> 	or	[edx], cx
   568 00004C3F C3                  <1> 	retn
   569                              <1> ;spde_2: ; error
   570                              <1> ;	stc
   571                              <1> ;	retn
   572                              <1> 
   573                              <1> set_pte:	; Set page table entry (PTE)
   574                              <1> 	; 24/07/2015
   575                              <1> 	; 20/07/2015
   576                              <1> 	; 23/06/2015
   577                              <1> 	; 18/04/2015
   578                              <1> 	; 12/04/2015
   579                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   580                              <1> 	;
   581                              <1> 	; INPUT ->
   582                              <1> 	;	EAX = physical page address
   583                              <1> 	;	      (use present value if EAX = 0)
   584                              <1> 	;	EBX = virtual (linear) address
   585                              <1> 	;	ECX = page attributes (lower 12 bits)
   586                              <1> 	;	      (higher 20 bits must be ZERO)
   587                              <1> 	;	      (bit 0 must be 1)	 
   588                              <1> 	;	u.pgdir = page directory (physical) address
   589                              <1> 	; OUTPUT ->
   590                              <1> 	;	EAX = physical page address
   591                              <1> 	;	(EDX = PTE value)
   592                              <1> 	;	EBX = virtual address
   593                              <1> 	;
   594                              <1> 	;	CF = 1 -> error
   595                              <1> 	;
   596                              <1> 	; Modified Registers -> EAX, EDX
   597                              <1> 	;
   598 00004C40 50                  <1> 	push	eax
   599 00004C41 A1[545D0100]        <1> 	mov	eax, [u.pgdir] ; 20/07/2015
   600 00004C46 E837000000          <1> 	call 	get_pde
   601                              <1> 		; EDX = PDE address
   602                              <1> 		; EAX = PDE value
   603 00004C4B 5A                  <1> 	pop	edx ; physical page address
   604 00004C4C 722A                <1> 	jc	short spte_err ; PDE not present
   605                              <1> 	;
   606 00004C4E 53                  <1> 	push	ebx ; 24/07/2015
   607 00004C4F 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   608                              <1> 			    ; EDX = PT address (physical)	
   609 00004C53 C1EB0C              <1> 	shr	ebx, PAGE_SHIFT ; 12
   610 00004C56 81E3FF030000        <1> 	and	ebx, PTE_MASK	; 03FFh
   611                              <1> 			 ; clear higher 10 bits (PD bits)
   612 00004C5C C1E302              <1> 	shl	ebx, 2   ; offset to page table (1024*4)
   613 00004C5F 01C3                <1> 	add	ebx, eax
   614                              <1> 	;
   615 00004C61 8B03                <1> 	mov	eax, [ebx] ; Old PTE value
   616 00004C63 A801                <1> 	test	al, 1
   617 00004C65 740C                <1> 	jz	short spte_0
   618 00004C67 09D2                <1> 	or	edx, edx
   619 00004C69 750F                <1> 	jnz	short spte_1
   620 00004C6B 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 bits
   621 00004C6F 89C2                <1> 	mov	edx, eax
   622 00004C71 EB09                <1> 	jmp	short spte_2	
   623                              <1> spte_0:
   624                              <1> 	; If this PTE contains a swap (disk) address,
   625                              <1> 	; it can be updated by using 'swap_in' procedure
   626                              <1> 	; only!
   627 00004C73 21C0                <1> 	and	eax, eax
   628 00004C75 7403                <1> 	jz	short spte_1
   629                              <1> 	; 24/07/2015
   630                              <1> 	; swapped page ! (on disk)
   631 00004C77 5B                  <1> 	pop	ebx
   632                              <1> spte_err:
   633 00004C78 F9                  <1> 	stc
   634 00004C79 C3                  <1> 	retn
   635                              <1> spte_1: 
   636 00004C7A 89D0                <1> 	mov	eax, edx
   637                              <1> spte_2:
   638 00004C7C 09CA                <1> 	or	edx, ecx
   639                              <1> 	; 23/06/2015
   640 00004C7E 8913                <1> 	mov	[ebx], edx ; PTE value in EDX
   641                              <1> 	; 24/07/2015
   642 00004C80 5B                  <1> 	pop	ebx
   643 00004C81 C3                  <1> 	retn
   644                              <1> 
   645                              <1> get_pde:	; Get present value of the relevant PDE
   646                              <1> 	; 20/07/2015
   647                              <1> 	; 18/04/2015
   648                              <1> 	; 12/04/2015
   649                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   650                              <1> 	;
   651                              <1> 	; INPUT ->
   652                              <1> 	;	EBX = virtual (linear) address
   653                              <1> 	;	EAX = page directory (physical) address
   654                              <1> 	; OUTPUT ->
   655                              <1> 	;	EDX = Page directory entry address
   656                              <1> 	;	EAX = Page directory entry value
   657                              <1> 	;	CF = 1 -> PDE not present or invalid ? 
   658                              <1> 	; Modified Registers -> EDX, EAX
   659                              <1> 	;
   660 00004C82 89DA                <1> 	mov	edx, ebx
   661 00004C84 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22  (12+10)
   662 00004C87 C1E202              <1> 	shl 	edx, 2 ; offset to page directory (1024*4)
   663 00004C8A 01C2                <1> 	add	edx, eax ; page directory address (physical)
   664 00004C8C 8B02                <1> 	mov	eax, [edx]
   665 00004C8E A801                <1> 	test	al, PDE_A_PRESENT ; page table is present or not !
   666 00004C90 751F                <1> 	jnz	short gpte_retn
   667 00004C92 F9                  <1> 	stc
   668                              <1> gpde_retn:	
   669 00004C93 C3                  <1> 	retn
   670                              <1> 
   671                              <1> get_pte:
   672                              <1> 		; Get present value of the relevant PTE
   673                              <1> 	; 29/07/2015
   674                              <1> 	; 20/07/2015
   675                              <1> 	; 18/04/2015
   676                              <1> 	; 12/04/2015
   677                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   678                              <1> 	;
   679                              <1> 	; INPUT ->
   680                              <1> 	;	EBX = virtual (linear) address
   681                              <1> 	;	EAX = page directory (physical) address
   682                              <1> 	; OUTPUT ->
   683                              <1> 	;	EDX = Page table entry address (if CF=0)
   684                              <1> 	;	      Page directory entry address (if CF=1)
   685                              <1> 	;            (Bit 0 value is 0 if PT is not present)
   686                              <1> 	;	EAX = Page table entry value (page address)
   687                              <1> 	;	CF = 1 -> PDE not present or invalid ? 
   688                              <1> 	; Modified Registers -> EAX, EDX
   689                              <1> 	;
   690 00004C94 E8E9FFFFFF          <1> 	call 	get_pde
   691 00004C99 72F8                <1> 	jc	short gpde_retn	; page table is not present
   692                              <1> 	;jnc	short gpte_1
   693                              <1> 	;retn
   694                              <1> ;gpte_1:
   695 00004C9B 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   696 00004C9F 89DA                <1> 	mov	edx, ebx
   697 00004CA1 C1EA0C              <1> 	shr	edx, PAGE_SHIFT ; 12
   698 00004CA4 81E2FF030000        <1> 	and	edx, PTE_MASK	; 03FFh
   699                              <1> 			 ; clear higher 10 bits (PD bits)
   700 00004CAA C1E202              <1> 	shl	edx, 2 ; offset from start of page table (1024*4)
   701 00004CAD 01C2                <1> 	add	edx, eax
   702 00004CAF 8B02                <1> 	mov	eax, [edx]
   703                              <1> gpte_retn:
   704 00004CB1 C3                  <1> 	retn
   705                              <1> 
   706                              <1> deallocate_page_dir:
   707                              <1> 	; 15/09/2015
   708                              <1> 	; 05/08/2015
   709                              <1> 	; 30/04/2015
   710                              <1> 	; 28/04/2015
   711                              <1> 	; 17/10/2014
   712                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   713                              <1> 	;
   714                              <1> 	; INPUT ->
   715                              <1> 	;	EAX = PHYSICAL ADDRESS OF THE PAGE DIRECTORY (CHILD)
   716                              <1> 	;	EBX = PHYSICAL ADDRESS OF THE PARENT'S PAGE DIRECTORY
   717                              <1> 	; OUTPUT ->
   718                              <1> 	;	All of page tables in the page directory
   719                              <1> 	;	and page dir's itself will be deallocated
   720                              <1> 	;	except 'read only' duplicated pages (will be converted
   721                              <1> 	;	to writable pages).
   722                              <1> 	;
   723                              <1> 	; Modified Registers -> EAX
   724                              <1> 	;
   725                              <1> 	;
   726 00004CB2 56                  <1> 	push	esi
   727 00004CB3 51                  <1> 	push	ecx
   728 00004CB4 50                  <1> 	push	eax
   729 00004CB5 89C6                <1> 	mov	esi, eax 
   730 00004CB7 31C9                <1> 	xor	ecx, ecx
   731                              <1> 	; The 1st PDE points to Kernel Page Table 0 (the 1st 4MB),
   732                              <1> 	; it must not be deallocated
   733 00004CB9 890E                <1> 	mov	[esi], ecx ; 0 ; clear PDE 0
   734                              <1> dapd_0:
   735 00004CBB AD                  <1> 	lodsd
   736 00004CBC A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
   737 00004CBE 7409                <1> 	jz	short dapd_1	
   738 00004CC0 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
   739 00004CC4 E812000000          <1> 	call	deallocate_page_table			
   740                              <1> dapd_1:
   741 00004CC9 41                  <1> 	inc	ecx ; page directory entry index
   742 00004CCA 81F900040000        <1> 	cmp	ecx, PAGE_SIZE / 4 ; 1024
   743 00004CD0 72E9                <1> 	jb	short dapd_0
   744                              <1> dapd_2:
   745 00004CD2 58                  <1> 	pop	eax
   746 00004CD3 E87F000000          <1> 	call	deallocate_page	; deallocate the page dir's itself
   747 00004CD8 59                  <1> 	pop	ecx
   748 00004CD9 5E                  <1> 	pop	esi
   749 00004CDA C3                  <1> 	retn
   750                              <1> 
   751                              <1> deallocate_page_table:
   752                              <1> 	; 12/07/2016
   753                              <1> 	; 19/09/2015
   754                              <1> 	; 15/09/2015
   755                              <1> 	; 05/08/2015
   756                              <1> 	; 30/04/2015
   757                              <1> 	; 28/04/2015
   758                              <1> 	; 24/10/2014
   759                              <1> 	; 23/10/2014
   760                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   761                              <1> 	;
   762                              <1> 	; INPUT ->
   763                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE PAGE TABLE
   764                              <1> 	;	EBX = PHYSICAL ADDRESS OF THE PARENT'S PAGE DIRECTORY
   765                              <1> 	;	(ECX = page directory entry index)
   766                              <1> 	; OUTPUT ->
   767                              <1> 	;	All of pages in the page table and page table's itself
   768                              <1> 	;	will be deallocated except 'read only' duplicated pages
   769                              <1> 	;	(will be converted to writable pages).
   770                              <1> 	;
   771                              <1> 	; Modified Registers -> EAX
   772                              <1> 	;
   773 00004CDB 56                  <1> 	push	esi
   774 00004CDC 57                  <1> 	push	edi
   775 00004CDD 52                  <1> 	push	edx
   776 00004CDE 50                  <1> 	push	eax ; *
   777 00004CDF 89C6                <1> 	mov	esi, eax 
   778 00004CE1 31FF                <1> 	xor	edi, edi ; 0
   779                              <1> dapt_0:
   780 00004CE3 AD                  <1> 	lodsd
   781 00004CE4 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
   782 00004CE6 7441                <1> 	jz	short dapt_1
   783                              <1> 	;
   784 00004CE8 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
   785                              <1> 				  ; (must be 1)
   786 00004CEA 754C                <1> 	jnz	short dapt_3
   787                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
   788 00004CEC 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
   789                              <1> 				   ; as child's page ?
   790 00004CF0 7451                <1> 	jz	short dapt_4 ; Clear PTE but don't deallocate the page!
   791                              <1> 	; check the parent's PTE value is read only & same page or not.. 
   792                              <1> 	; ECX = page directory entry index (0-1023)
   793 00004CF2 53                  <1> 	push	ebx
   794 00004CF3 51                  <1> 	push	ecx
   795 00004CF4 66C1E102            <1> 	shl	cx, 2 ; *4 
   796 00004CF8 01CB                <1> 	add	ebx, ecx ; PDE offset (for the parent)
   797 00004CFA 8B0B                <1> 	mov	ecx, [ebx]
   798 00004CFC F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
   799 00004CFF 7435                <1> 	jz	short dapt_2	; parent process does not use this page
   800 00004D01 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
   801                              <1> 	; EDI = page table entry index (0-1023)
   802 00004D06 89FA                <1> 	mov	edx, edi 
   803 00004D08 66C1E202            <1> 	shl	dx, 2 ; *4 
   804 00004D0C 01CA                <1> 	add	edx, ecx ; PTE offset (for the parent)
   805 00004D0E 8B1A                <1> 	mov	ebx, [edx]
   806 00004D10 F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
   807 00004D13 7421                <1> 	jz	short dapt_2	; parent process does not use this page
   808 00004D15 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
   809 00004D19 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
   810 00004D1E 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
   811 00004D20 7514                <1> 	jne	short dapt_2	; not same page
   812                              <1> 				; deallocate the child's page
   813 00004D22 800A02              <1>         or      byte [edx], PTE_A_WRITE ; convert to writable page (parent)
   814 00004D25 59                  <1> 	pop	ecx
   815 00004D26 5B                  <1> 	pop	ebx
   816 00004D27 EB1A                <1> 	jmp	short dapt_4
   817                              <1> dapt_1:
   818 00004D29 09C0                <1> 	or	eax, eax	; swapped page ?
   819 00004D2B 741D                <1> 	jz	short dapt_5	; no
   820                              <1> 				; yes
   821 00004D2D D1E8                <1> 	shr	eax, 1
   822 00004D2F E8CA040000          <1> 	call	unlink_swap_block ; Deallocate swapped page block
   823                              <1> 				  ; on the swap disk (or in file)
   824 00004D34 EB14                <1> 	jmp	short dapt_5
   825                              <1> dapt_2:
   826 00004D36 59                  <1> 	pop	ecx
   827 00004D37 5B                  <1> 	pop	ebx
   828                              <1> dapt_3:	
   829                              <1> 	; 12/07/2016
   830 00004D38 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
   831 00004D3C 7505                <1> 	jnz	short dapt_4   ; AVL bit 1 = 1, do not deallocate this page!
   832                              <1> 	;
   833                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
   834 00004D3E E814000000          <1> 	call	deallocate_page ; set the mem allocation bit of this page
   835                              <1> dapt_4:
   836 00004D43 C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
   837                              <1> dapt_5:
   838 00004D4A 47                  <1> 	inc	edi ; page table entry index
   839 00004D4B 81FF00040000        <1> 	cmp	edi, PAGE_SIZE / 4 ; 1024
   840 00004D51 7290                <1> 	jb	short dapt_0
   841                              <1> 	;
   842 00004D53 58                  <1> 	pop	eax ; *
   843 00004D54 5A                  <1> 	pop	edx
   844 00004D55 5F                  <1> 	pop	edi	
   845 00004D56 5E                  <1> 	pop	esi
   846                              <1> 	;
   847                              <1> 	;call	deallocate_page	; deallocate the page table's itself
   848                              <1> 	;retn
   849                              <1> 
   850                              <1> deallocate_page:
   851                              <1> 	; 15/09/2015
   852                              <1> 	; 28/04/2015
   853                              <1> 	; 10/03/2015
   854                              <1> 	; 17/10/2014
   855                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   856                              <1> 	;
   857                              <1> 	; INPUT -> 
   858                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
   859                              <1> 	; OUTPUT ->
   860                              <1> 	;	[free_pages] is increased
   861                              <1> 	;	(corresponding MEMORY ALLOCATION TABLE bit is SET)
   862                              <1> 	;	CF = 1 if the page is already deallocated
   863                              <1> 	; 	       (or not allocated) before.  
   864                              <1> 	;
   865                              <1> 	; Modified Registers -> EAX
   866                              <1> 	;
   867 00004D57 53                  <1> 	push	ebx
   868 00004D58 52                  <1> 	push	edx
   869                              <1> 	;
   870 00004D59 C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; shift physical address to 
   871                              <1> 				     ; 12 bits right
   872                              <1> 				     ; to get page number
   873 00004D5C 89C2                <1> 	mov	edx, eax
   874                              <1> 	; 15/09/2015
   875 00004D5E C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
   876                              <1> 				     ; (1 allocation bit = 1 page)
   877                              <1> 				     ; (1 allocation bytes = 8 pages)
   878 00004D61 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
   879                              <1> 				     ; (to get 32 bit position)			
   880                              <1> 	;
   881 00004D64 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address
   882 00004D69 01D3                <1> 	add	ebx, edx
   883 00004D6B 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
   884                              <1> 				     ; (allocation bit position)	 
   885 00004D6E 3B15[EC410100]      <1> 	cmp 	edx, [next_page]     ; is the new free page address lower
   886                              <1> 				     ; than the address in 'next_page' ?
   887                              <1> 				     ; (next/first free page value)		
   888 00004D74 7306                <1> 	jnb	short dap_1	     ; no	
   889 00004D76 8915[EC410100]      <1> 	mov	[next_page], edx     ; yes
   890                              <1> dap_1:
   891 00004D7C 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate page
   892                              <1> 				     ; set relevant bit to 1.
   893                              <1> 				     ; set CF to the previous bit value	
   894                              <1> 	;cmc			     ; complement carry flag	
   895                              <1> 	;jc	short dap_2	     ; do not increase free_pages count
   896                              <1> 				     ; if the page is already deallocated
   897                              <1> 				     ; before.	
   898 00004D7F FF05[E8410100]      <1>         inc     dword [free_pages]
   899                              <1> dap_2:
   900 00004D85 5A                  <1> 	pop	edx
   901 00004D86 5B                  <1> 	pop	ebx
   902 00004D87 C3                  <1> 	retn
   903                              <1> 
   904                              <1> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   905                              <1> ;;                                                              ;;
   906                              <1> ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
   907                              <1> ;; Distributed under terms of the GNU General Public License    ;;
   908                              <1> ;;                                                              ;;
   909                              <1> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   910                              <1> 
   911                              <1> ;;$Revision: 5057 $
   912                              <1> 
   913                              <1> 
   914                              <1> ;;align 4
   915                              <1> ;;proc alloc_page
   916                              <1> 
   917                              <1> ;;        pushfd
   918                              <1> ;;        cli
   919                              <1> ;;        push    ebx
   920                              <1> ;;;//-
   921                              <1> ;;        cmp     [pg_data.pages_free], 1
   922                              <1> ;;        jle     .out_of_memory
   923                              <1> ;;;//-
   924                              <1> ;;
   925                              <1> ;;        mov     ebx, [page_start]
   926                              <1> ;;        mov     ecx, [page_end]
   927                              <1> ;;.l1:
   928                              <1> ;;        bsf     eax, [ebx];
   929                              <1> ;;        jnz     .found
   930                              <1> ;;        add     ebx, 4
   931                              <1> ;;        cmp     ebx, ecx
   932                              <1> ;;        jb      .l1
   933                              <1> ;;        pop     ebx
   934                              <1> ;;        popfd
   935                              <1> ;;        xor     eax, eax
   936                              <1> ;;        ret
   937                              <1> ;;.found:
   938                              <1> ;;;//-
   939                              <1> ;;        dec     [pg_data.pages_free]
   940                              <1> ;;        jz      .out_of_memory
   941                              <1> ;;;//-
   942                              <1> ;;        btr     [ebx], eax
   943                              <1> ;;        mov     [page_start], ebx
   944                              <1> ;;        sub     ebx, sys_pgmap
   945                              <1> ;;        lea     eax, [eax+ebx*8]
   946                              <1> ;;        shl     eax, 12
   947                              <1> ;;;//-       dec [pg_data.pages_free]
   948                              <1> ;;        pop     ebx
   949                              <1> ;;        popfd
   950                              <1> ;;        ret
   951                              <1> ;;;//-
   952                              <1> ;;.out_of_memory:
   953                              <1> ;;        mov     [pg_data.pages_free], 1
   954                              <1> ;;        xor     eax, eax
   955                              <1> ;;        pop     ebx
   956                              <1> ;;        popfd
   957                              <1> ;;        ret
   958                              <1> ;;;//-
   959                              <1> ;;endp
   960                              <1> 
   961                              <1> duplicate_page_dir:
   962                              <1> 	; 21/09/2015
   963                              <1> 	; 31/08/2015
   964                              <1> 	; 20/07/2015
   965                              <1> 	; 28/04/2015
   966                              <1> 	; 27/04/2015
   967                              <1> 	; 18/04/2015
   968                              <1> 	; 12/04/2015
   969                              <1> 	; 18/10/2014
   970                              <1> 	; 16/10/2014 (Retro UNIX 386 v1 - beginning)
   971                              <1> 	;
   972                              <1> 	; INPUT -> 
   973                              <1> 	;	[u.pgdir] = PHYSICAL (real/flat) ADDRESS of the parent's
   974                              <1> 	;		    page directory.
   975                              <1> 	; OUTPUT ->
   976                              <1> 	;	EAX =  PHYSICAL (real/flat) ADDRESS of the child's
   977                              <1> 	;	       page directory.
   978                              <1> 	;	(New page directory with new page table entries.)
   979                              <1> 	;	(New page tables with read only copies of the parent's
   980                              <1> 	;	pages.)
   981                              <1> 	;	EAX = 0 -> Error (CF = 1)
   982                              <1> 	;
   983                              <1> 	; Modified Registers -> none (except EAX)
   984                              <1> 	;
   985 00004D88 E8ECFDFFFF          <1> 	call	allocate_page
   986 00004D8D 723E                <1> 	jc	short dpd_err
   987                              <1> 	;
   988 00004D8F 55                  <1> 	push	ebp ; 20/07/2015
   989 00004D90 56                  <1> 	push	esi
   990 00004D91 57                  <1> 	push	edi
   991 00004D92 53                  <1> 	push	ebx
   992 00004D93 51                  <1> 	push	ecx
   993 00004D94 8B35[545D0100]      <1> 	mov	esi, [u.pgdir]
   994 00004D9A 89C7                <1> 	mov	edi, eax
   995 00004D9C 50                  <1> 	push	eax ; save child's page directory address
   996                              <1> 	; 31/08/2015
   997                              <1> 	; copy PDE 0 from the parent's page dir to the child's page dir
   998                              <1> 	; (use same system space for all user page tables) 
   999 00004D9D A5                  <1> 	movsd
  1000 00004D9E BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  1001 00004DA3 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  1002                              <1> dpd_0:	
  1003 00004DA8 AD                  <1> 	lodsd
  1004                              <1> 	;or	eax, eax
  1005                              <1>         ;jnz     short dpd_1
  1006 00004DA9 A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  1007 00004DAB 7508                <1> 	jnz	short dpd_1
  1008                              <1>  	; 20/07/2015 (virtual address at the end of the page table)	
  1009 00004DAD 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  1010 00004DB3 EB0F                <1> 	jmp	short dpd_2
  1011                              <1> dpd_1:	
  1012 00004DB5 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  1013 00004DB9 89C3                <1> 	mov	ebx, eax
  1014                              <1> 	; EBX = Parent's page table address
  1015 00004DBB E81F000000          <1> 	call	duplicate_page_table
  1016 00004DC0 720C                <1> 	jc	short dpd_p_err
  1017                              <1> 	; EAX = Child's page table address
  1018 00004DC2 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  1019                              <1> 			 ; set bit 0, bit 1 and bit 2 to 1
  1020                              <1> 			 ; (present, writable, user)
  1021                              <1> dpd_2:
  1022 00004DC4 AB                  <1> 	stosd
  1023 00004DC5 E2E1                <1> 	loop	dpd_0
  1024                              <1> 	;
  1025 00004DC7 58                  <1> 	pop	eax  ; restore child's page directory address
  1026                              <1> dpd_3:
  1027 00004DC8 59                  <1> 	pop	ecx
  1028 00004DC9 5B                  <1> 	pop	ebx
  1029 00004DCA 5F                  <1> 	pop	edi
  1030 00004DCB 5E                  <1> 	pop	esi
  1031 00004DCC 5D                  <1> 	pop	ebp ; 20/07/2015
  1032                              <1> dpd_err:
  1033 00004DCD C3                  <1> 	retn
  1034                              <1> dpd_p_err:
  1035                              <1> 	; release the allocated pages missing (recover free space)
  1036 00004DCE 58                  <1> 	pop	eax  ; the new page directory address (physical)
  1037 00004DCF 8B1D[545D0100]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  1038 00004DD5 E8D8FEFFFF          <1> 	call 	deallocate_page_dir
  1039 00004DDA 29C0                <1> 	sub	eax, eax ; 0
  1040 00004DDC F9                  <1> 	stc
  1041 00004DDD EBE9                <1> 	jmp	short dpd_3	
  1042                              <1> 
  1043                              <1> duplicate_page_table:
  1044                              <1> 	; 20/02/2017
  1045                              <1> 	; 21/09/2015
  1046                              <1> 	; 20/07/2015
  1047                              <1> 	; 05/05/2015
  1048                              <1> 	; 28/04/2015
  1049                              <1> 	; 27/04/2015
  1050                              <1> 	; 18/04/2015
  1051                              <1> 	; 18/10/2014
  1052                              <1> 	; 16/10/2014 (Retro UNIX 386 v1 - beginning)
  1053                              <1> 	;
  1054                              <1> 	; INPUT -> 
  1055                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS of the parent's page table.
  1056                              <1> 	;       20/02/2017		 
  1057                              <1> 	;	EBP = Linear address of the page (from 'duplicate_page_dir')
  1058                              <1> 	;	      (Linear address = CORE + user's virtual address) 	
  1059                              <1> 	; OUTPUT ->
  1060                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS of the child's page table.
  1061                              <1> 	;	      (with 'read only' attribute of page table entries)
  1062                              <1> 	;	20/02/2017
  1063                              <1> 	;	EBP = Next linear page address (for 'duplicate_page_dir')
  1064                              <1> 	;	
  1065                              <1> 	;	CF = 1 -> error 
  1066                              <1> 	;
  1067                              <1> 	; Modified Registers -> EBP (except EAX)
  1068                              <1> 	;
  1069 00004DDF E895FDFFFF          <1> 	call	allocate_page
  1070 00004DE4 726A                <1> 	jc	short dpt_err
  1071                              <1> 	;
  1072 00004DE6 50                  <1> 	push	eax ; *
  1073 00004DE7 56                  <1> 	push	esi
  1074 00004DE8 57                  <1> 	push	edi
  1075 00004DE9 52                  <1> 	push	edx
  1076 00004DEA 51                  <1> 	push	ecx
  1077                              <1> 	;
  1078 00004DEB 89DE                <1> 	mov	esi, ebx
  1079 00004DED 89C7                <1> 	mov	edi, eax
  1080 00004DEF 89C2                <1> 	mov	edx, eax
  1081 00004DF1 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  1082                              <1> dpt_0:
  1083 00004DF7 AD                  <1> 	lodsd
  1084 00004DF8 21C0                <1> 	and	eax, eax
  1085 00004DFA 7444                <1> 	jz	short dpt_3
  1086 00004DFC A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  1087 00004DFE 7507                <1> 	jnz	short dpt_1
  1088                              <1> 	; 20/07/2015
  1089                              <1> 	; ebp = virtual (linear) address of the memory page
  1090 00004E00 E83F050000          <1> 	call	reload_page ; 28/04/2015
  1091 00004E05 7244                <1> 	jc	short dpt_p_err
  1092                              <1> dpt_1:
  1093                              <1> 	; 21/09/2015
  1094 00004E07 89C1                <1> 	mov	ecx, eax
  1095 00004E09 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1096 00004E0D F6C102              <1> 	test	cl, PTE_A_WRITE ; writable page ?
  1097 00004E10 7525                <1> 	jnz	short dpt_2
  1098                              <1> 	; Read only (parent) page
  1099                              <1> 	; 	- there is a third process which uses this page -
  1100                              <1> 	; Allocate a new page for the child process
  1101 00004E12 E862FDFFFF          <1> 	call	allocate_page
  1102 00004E17 7232                <1> 	jc	short dpt_p_err
  1103 00004E19 57                  <1> 	push	edi
  1104 00004E1A 56                  <1> 	push	esi
  1105 00004E1B 89CE                <1> 	mov	esi, ecx
  1106 00004E1D 89C7                <1> 	mov	edi, eax
  1107 00004E1F B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  1108 00004E24 F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  1109 00004E26 5E                  <1> 	pop	esi
  1110 00004E27 5F                  <1> 	pop	edi
  1111                              <1> 	; 
  1112 00004E28 53                  <1> 	push	ebx
  1113 00004E29 50                  <1> 	push	eax
  1114                              <1> 	; 20/07/2015
  1115 00004E2A 89EB                <1> 	mov	ebx, ebp
  1116                              <1> 	; ebx = virtual (linear) address of the memory page
  1117 00004E2C E887030000          <1> 	call	add_to_swap_queue
  1118 00004E31 58                  <1> 	pop	eax
  1119 00004E32 5B                  <1> 	pop	ebx
  1120                              <1> 	; 21/09/2015
  1121 00004E33 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  1122                              <1> 		; user + writable + present page
  1123 00004E35 EB09                <1> 	jmp	short dpt_3
  1124                              <1> dpt_2:
  1125                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  1126 00004E37 0C05                <1> 	or	al, PTE_A_USER+PTE_A_PRESENT 
  1127                              <1> 		    ; (read only page!)
  1128 00004E39 8946FC              <1> 	mov	[esi-4], eax ; update parent's PTE
  1129 00004E3C 660D0002            <1> 	or      ax, PTE_DUPLICATED  ; (read only page & duplicated PTE!)
  1130                              <1> dpt_3:
  1131 00004E40 AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  1132                              <1> 	;
  1133 00004E41 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  1134                              <1> 	;
  1135 00004E47 39D7                <1> 	cmp	edi, edx
  1136 00004E49 72AC                <1> 	jb	short dpt_0
  1137                              <1> dpt_p_err:
  1138 00004E4B 59                  <1> 	pop	ecx
  1139 00004E4C 5A                  <1> 	pop	edx
  1140 00004E4D 5F                  <1> 	pop	edi
  1141 00004E4E 5E                  <1> 	pop	esi
  1142 00004E4F 58                  <1> 	pop	eax ; *
  1143                              <1> dpt_err:
  1144 00004E50 C3                  <1> 	retn
  1145                              <1> 
  1146                              <1> page_fault_handler:	; CPU EXCEPTION 0Eh (14) : Page Fault !
  1147                              <1> 	; 21/09/2015
  1148                              <1> 	; 19/09/2015
  1149                              <1> 	; 17/09/2015
  1150                              <1> 	; 28/08/2015
  1151                              <1> 	; 20/07/2015
  1152                              <1> 	; 28/06/2015
  1153                              <1> 	; 03/05/2015
  1154                              <1> 	; 30/04/2015
  1155                              <1> 	; 18/04/2015
  1156                              <1> 	; 12/04/2015
  1157                              <1> 	; 30/10/2014
  1158                              <1> 	; 11/09/2014
  1159                              <1> 	; 10/09/2014 (Retro UNIX 386 v1 - beginning)
  1160                              <1> 	;
  1161                              <1> 	; Note: This is not an interrupt/exception handler.
  1162                              <1> 	;	This is a 'page fault remedy' subroutine 
  1163                              <1> 	;	which will be called by standard/uniform
  1164                              <1> 	;	exception handler.
  1165                              <1> 	;
  1166                              <1> 	; INPUT -> 
  1167                              <1> 	;	[error_code] = 32 bit ERROR CODE (lower 5 bits are valid)
  1168                              <1> 	;
  1169                              <1> 	;	cr2 = the virtual (linear) address 
  1170                              <1> 	;	      which has caused to page fault (19/09/2015)
  1171                              <1> 	;
  1172                              <1> 	; OUTPUT ->
  1173                              <1> 	;	(corresponding PAGE TABLE ENTRY is mapped/set)
  1174                              <1> 	;	EAX = 0 -> no error
  1175                              <1> 	;	EAX > 0 -> error code in EAX (also CF = 1)
  1176                              <1> 	;
  1177                              <1> 	; Modified Registers -> none (except EAX)
  1178                              <1> 	;	
  1179                              <1>         ;
  1180                              <1>         ; ERROR CODE:
  1181                              <1> 	;	 31  .....	4   3	2   1	0
  1182                              <1> 	;	+---+-- --+---+---+---+---+---+---+
  1183                              <1> 	;	|   Reserved  | I | R | U | W | P |
  1184                              <1> 	;	+---+-- --+---+---+---+---+---+---+
  1185                              <1> 	;
  1186                              <1> 	; P : PRESENT -	When set, the page fault was caused by 
  1187                              <1>     	;		a page-protection violation. When not set,
  1188                              <1> 	;		it was caused by a non-present page.
  1189                              <1> 	; W : WRITE   -	When set, the page fault was caused by
  1190                              <1> 	;		a page write. When not set, it was caused
  1191                              <1> 	;		by a page read.
  1192                              <1> 	; U : USER    -	When set, the page fault was caused 
  1193                              <1> 	;		while CPL = 3. 
  1194                              <1> 	;		This does not necessarily mean that
  1195                              <1> 	;		the page fault was a privilege violation.
  1196                              <1> 	; R : RESERVD -	When set, the page fault was caused by
  1197                              <1> 	;     WRITE	reading a 1 in a reserved field.
  1198                              <1> 	; I : INSTRUC -	When set, the page fault was caused by
  1199                              <1> 	;     FETCH	an instruction fetch
  1200                              <1> 	;
  1201                              <1> 	;; x86 (32 bit) VIRTUAL ADDRESS TRANSLATION
  1202                              <1> 	;  31               22                  12 11                    0
  1203                              <1> 	; +-------------------+-------------------+-----------------------+
  1204                              <1>        	; | PAGE DIR. ENTRY # | PAGE TAB. ENTRY # |        OFFSET         |
  1205                              <1>        	; +-------------------+-------------------+-----------------------+
  1206                              <1> 	;
  1207                              <1> 
  1208                              <1> 	;; CR3 REGISTER (Control Register 3)
  1209                              <1> 	;  31                                   12             5 4 3 2   0
  1210                              <1> 	; +---------------------------------------+-------------+---+-----+
  1211                              <1>       	; |                                       |  		|P|P|     |
  1212                              <1>       	; |   PAGE DIRECTORY TABLE BASE ADDRESS   |  reserved	|C|W|rsvrd|
  1213                              <1>       	; |                                       | 		|D|T|     |
  1214                              <1>    	; +---------------------------------------+-------------+---+-----+
  1215                              <1> 	;
  1216                              <1> 	;	PWT    - WRITE THROUGH
  1217                              <1> 	;	PCD    - CACHE DISABLE		
  1218                              <1> 	;
  1219                              <1> 	;
  1220                              <1> 	;; x86 PAGE DIRECTORY ENTRY (4 KByte Page)
  1221                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1222                              <1> 	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1223                              <1>       	; |                                       |     | | | | |P|P|U|R| |
  1224                              <1>       	; |     PAGE TABLE BASE ADDRESS 31..12    | AVL |G|0|D|A|C|W|/|/|P|
  1225                              <1>       	; |                                       |     | | | | |D|T|S|W| |
  1226                              <1>    	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1227                              <1> 	;
  1228                              <1>         ;       P      - PRESENT
  1229                              <1>         ;       R/W    - READ/WRITE
  1230                              <1>         ;       U/S    - USER/SUPERVISOR
  1231                              <1> 	;	PWT    - WRITE THROUGH
  1232                              <1> 	;	PCD    - CACHE DISABLE	
  1233                              <1> 	;	A      - ACCESSED	
  1234                              <1>         ;       D      - DIRTY (IGNORED)
  1235                              <1> 	;	PAT    - PAGE ATTRIBUTE TABLE INDEX (CACHE BEHAVIOR)
  1236                              <1> 	;	G      - GLOBAL	(IGNORED) 
  1237                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1238                              <1> 	;
  1239                              <1> 	;
  1240                              <1> 	;; x86 PAGE TABLE ENTRY (4 KByte Page)
  1241                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1242                              <1> 	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1243                              <1>       	; |                                       |     | |P| | |P|P|U|R| |
  1244                              <1>       	; |     PAGE FRAME BASE ADDRESS 31..12    | AVL |G|A|D|A|C|W|/|/|P|
  1245                              <1>       	; |                                       |     | |T| | |D|T|S|W| |
  1246                              <1>    	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1247                              <1> 	;
  1248                              <1>         ;       P      - PRESENT
  1249                              <1>         ;       R/W    - READ/WRITE
  1250                              <1>         ;       U/S    - USER/SUPERVISOR
  1251                              <1> 	;	PWT    - WRITE THROUGH
  1252                              <1> 	;	PCD    - CACHE DISABLE	
  1253                              <1> 	;	A      - ACCESSED	
  1254                              <1>         ;       D      - DIRTY
  1255                              <1> 	;	PAT    - PAGE ATTRIBUTE TABLE INDEX (CACHE BEHAVIOR)
  1256                              <1> 	;	G      - GLOBAL	 
  1257                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1258                              <1> 	;
  1259                              <1> 	;
  1260                              <1> 	;; 80386 PAGE TABLE ENTRY (4 KByte Page)
  1261                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1262                              <1> 	; +---------------------------------------+-----+-+-+-+-+---+-+-+-+
  1263                              <1>       	; |                                       |     | | | | | | |U|R| |
  1264                              <1>       	; |     PAGE FRAME BASE ADDRESS 31..12    | AVL |0|0|D|A|0|0|/|/|P|
  1265                              <1>       	; |                                       |     | | | | | | |S|W| |
  1266                              <1>       	; +---------------------------------------+-----+-+-+-+-+---+-+-+-+
  1267                              <1> 	;
  1268                              <1>         ;       P      - PRESENT
  1269                              <1>         ;       R/W    - READ/WRITE
  1270                              <1>         ;       U/S    - USER/SUPERVISOR
  1271                              <1>         ;       D      - DIRTY
  1272                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1273                              <1> 	;
  1274                              <1>         ;       NOTE: 0 INDICATES INTEL RESERVED. DO NOT DEFINE.
  1275                              <1> 	;
  1276                              <1> 	;
  1277                              <1> 	;; Invalid Page Table Entry
  1278                              <1> 	; 31                                                           1 0
  1279                              <1>       	; +-------------------------------------------------------------+-+
  1280                              <1>       	; |                                                             | |
  1281                              <1>       	; |                          AVAILABLE                          |0|
  1282                              <1>       	; |                                                             | |
  1283                              <1>       	; +-------------------------------------------------------------+-+
  1284                              <1> 	;
  1285                              <1> 
  1286 00004E51 53                  <1> 	push	ebx
  1287 00004E52 52                  <1> 	push	edx
  1288 00004E53 51                  <1> 	push	ecx
  1289                              <1> 	;
  1290                              <1> 	; 21/09/2015 (debugging)
  1291 00004E54 FF05[685D0100]      <1> 	inc	dword [u.pfcount] ; page fault count for running process
  1292 00004E5A FF05[1C5F0100]      <1> 	inc	dword [PF_Count] ; total page fault count	
  1293                              <1> 	; 28/06/2015
  1294                              <1> 	;mov	edx, [error_code] ; Lower 5 bits are valid
  1295 00004E60 8A15[145F0100]      <1> 	mov	dl, [error_code]
  1296                              <1> 	;
  1297 00004E66 F6C201              <1> 	test	dl, 1	; page fault was caused by a non-present page
  1298                              <1> 			; sign
  1299 00004E69 7422                <1> 	jz	short pfh_alloc_np
  1300                              <1> 	; 
  1301                              <1> 	; If it is not a 'write on read only page' type page fault
  1302                              <1> 	; major page fault error with minor reason must be returned without 
  1303                              <1> 	; fixing the problem. 'sys_exit with error' will be needed
  1304                              <1> 	; after return here!
  1305                              <1> 	; Page fault will be remedied, by copying page contents
  1306                              <1> 	; to newly allocated page with write permission;
  1307                              <1> 	; sys_fork -> sys_exec -> copy on write, demand paging method is 
  1308                              <1> 	; used for working with minimum possible memory usage. 
  1309                              <1> 	; sys_fork will duplicate page directory and tables of parent  
  1310                              <1> 	; process with 'read only' flag. If the child process attempts to
  1311                              <1> 	; write on these read only pages, page fault will be directed here
  1312                              <1> 	; for allocating a new page with same data/content. 
  1313                              <1> 	;
  1314                              <1> 	; IMPORTANT : Retro UNIX 386 v1 (and SINGLIX and TR-DOS)
  1315                              <1> 	; will not force to separate CODE and DATA space 
  1316                              <1> 	; in a process/program... 
  1317                              <1> 	; CODE segment/section may contain DATA!
  1318                              <1> 	; It is flat, smoth and simplest programming method already as in 
  1319                              <1> 	; Retro UNIX 8086 v1 and MS-DOS programs.
  1320                              <1> 	;	
  1321 00004E6B F6C202              <1> 	test	dl, 2	; page fault was caused by a page write
  1322                              <1> 			; sign
  1323 00004E6E 0F84AB000000        <1>         jz      pfh_p_err
  1324                              <1> 	; 31/08/2015
  1325 00004E74 F6C204              <1> 	test	dl, 4	; page fault was caused while CPL = 3 (user mode)
  1326                              <1> 			; sign.  (U+W+P = 4+2+1 = 7)
  1327 00004E77 0F84A2000000        <1>         jz	pfh_pv_err
  1328                              <1> 	;
  1329                              <1> 	; make a new page and copy the parent's page content
  1330                              <1> 	; as the child's new page content
  1331                              <1> 	;
  1332 00004E7D 0F20D3              <1> 	mov	ebx, cr2 ; CR2 contains the linear address 
  1333                              <1> 			 ; which has caused to page fault
  1334 00004E80 E8A2000000          <1> 	call 	copy_page
  1335 00004E85 0F828D000000        <1>         jc      pfh_im_err ; insufficient memory
  1336                              <1> 	;
  1337 00004E8B EB7D                <1>         jmp     pfh_cpp_ok
  1338                              <1> 	;
  1339                              <1> pfh_alloc_np:
  1340 00004E8D E8E7FCFFFF          <1> 	call	allocate_page	; (allocate a new page)
  1341 00004E92 0F8280000000        <1>         jc      pfh_im_err	; 'insufficient memory' error
  1342                              <1> pfh_chk_cpl:
  1343                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  1344                              <1> 		; (Lower 12 bits are ZERO, because 
  1345                              <1> 		;	the address is on a page boundary)
  1346 00004E98 80E204              <1> 	and	dl, 4	; CPL = 3 ?
  1347 00004E9B 7505                <1> 	jnz	short pfh_um
  1348                              <1> 			; Page fault handler for kernel/system mode (CPL=0)		
  1349 00004E9D 0F20DB              <1> 	mov	ebx, cr3 ; CR3 (Control Register 3) contains physical address
  1350                              <1> 			 ; of the current/active page directory
  1351                              <1> 			 ; (Always kernel/system mode page directory, here!)
  1352                              <1> 			 ; Note: Lower 12 bits are 0. (page boundary)
  1353 00004EA0 EB06                <1> 	jmp	short pfh_get_pde
  1354                              <1> 	;
  1355                              <1> pfh_um:			; Page fault handler for user/appl. mode (CPL=3)
  1356 00004EA2 8B1D[545D0100]      <1>  	mov	ebx, [u.pgdir] ; Page directory of current/active process
  1357                              <1> 			; Physical address of the USER's page directory
  1358                              <1> 			; Note: Lower 12 bits are 0. (page boundary)
  1359                              <1> pfh_get_pde:
  1360 00004EA8 80CA03              <1> 	or	dl, 3	; USER + WRITE + PRESENT or SYSTEM + WRITE + PRESENT
  1361 00004EAB 0F20D1              <1> 	mov	ecx, cr2 ; CR2 contains the virtual address 
  1362                              <1> 			 ; which has been caused to page fault
  1363                              <1> 			 ;
  1364 00004EAE C1E914              <1> 	shr	ecx, 20	 ; shift 20 bits right
  1365 00004EB1 80E1FC              <1> 	and	cl, 0FCh ; mask lower 2 bits to get PDE offset		
  1366                              <1> 	;
  1367 00004EB4 01CB                <1> 	add	ebx, ecx ; now, EBX points to the relevant page dir entry 
  1368 00004EB6 8B0B                <1> 	mov	ecx, [ebx] ; physical (base) address of the page table 	
  1369 00004EB8 F6C101              <1> 	test	cl, 1	 ; check bit 0 is set (1) or not (0).
  1370 00004EBB 740B                <1> 	jz	short pfh_set_pde ; Page directory entry is not valid,
  1371                              <1> 			  	  ; set/validate page directory entry
  1372 00004EBD 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  1373 00004EC2 89CB                <1> 	mov	ebx, ecx ; Physical address of the page table
  1374 00004EC4 89C1                <1> 	mov	ecx, eax ; new page address (physical) 	
  1375 00004EC6 EB16                <1> 	jmp	short pfh_get_pte
  1376                              <1> pfh_set_pde:
  1377                              <1> 	;; NOTE: Page directories and page tables never be swapped out!
  1378                              <1> 	;;	 (So, we know this PDE is empty or invalid)
  1379                              <1> 	;
  1380 00004EC8 08D0                <1> 	or	al, dl	 ; lower 3 bits are used as U/S, R/W, P flags
  1381 00004ECA 8903                <1> 	mov	[ebx], eax ; Let's put the new page directory entry here !
  1382 00004ECC 30C0                <1> 	xor	al, al	 ; clear lower (3..8) bits
  1383 00004ECE 89C3                <1> 	mov	ebx, eax
  1384 00004ED0 E8A4FCFFFF          <1> 	call	allocate_page	 ; (allocate a new page)
  1385 00004ED5 7241                <1> 	jc	short pfh_im_err   ; 'insufficient memory' error
  1386                              <1> pfh_spde_1:
  1387                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  1388 00004ED7 89C1                <1> 	mov	ecx, eax
  1389 00004ED9 E815FDFFFF          <1> 	call	clear_page ; Clear page content
  1390                              <1> pfh_get_pte:
  1391 00004EDE 0F20D0              <1> 	mov	eax, cr2 ; virtual address
  1392                              <1> 			 ; which has been caused to page fault
  1393 00004EE1 89C7                <1> 	mov	edi, eax ; 20/07/2015
  1394 00004EE3 C1E80C              <1> 	shr	eax, 12	 ; shift 12 bit right to get 
  1395                              <1> 			 ; higher 20 bits of the page fault address 
  1396 00004EE6 25FF030000          <1> 	and	eax, 3FFh ; mask PDE# bits, the result is PTE# (0 to 1023)
  1397 00004EEB C1E002              <1> 	shl	eax, 2	; shift 2 bits left to get PTE offset
  1398 00004EEE 01C3                <1> 	add	ebx, eax ; now, EBX points to the relevant page table entry 
  1399 00004EF0 8B03                <1> 	mov	eax, [ebx] ; get previous value of pte
  1400                              <1> 		; bit 0 of EAX is always 0 (otherwise we would not be here)
  1401 00004EF2 21C0                <1> 	and	eax, eax
  1402 00004EF4 7410                <1> 	jz	short pfh_gpte_1
  1403                              <1> 	; 20/07/2015
  1404 00004EF6 87D9                <1> 	xchg	ebx, ecx ; new page address (physical)
  1405 00004EF8 55                  <1> 	push	ebp ; 20/07/2015
  1406 00004EF9 0F20D5              <1> 	mov	ebp, cr2
  1407                              <1> 		; ECX = physical address of the page table entry
  1408                              <1> 		; EBX = Memory page address (physical!)
  1409                              <1> 		; EAX = Swap disk (offset) address
  1410                              <1> 		; EBP = virtual address (page fault address)
  1411 00004EFC E8B7000000          <1> 	call	swap_in
  1412 00004F01 5D                  <1> 	pop	ebp
  1413 00004F02 7210                <1> 	jc      short pfh_err_retn
  1414 00004F04 87CB                <1> 	xchg	ecx, ebx
  1415                              <1> 		; EBX = physical address of the page table entry
  1416                              <1> 		; ECX = new page
  1417                              <1> pfh_gpte_1:
  1418 00004F06 08D1                <1> 	or	cl, dl	; lower 3 bits are used as U/S, R/W, P flags
  1419 00004F08 890B                <1> 	mov	[ebx], ecx ; Let's put the new page table entry here !
  1420                              <1> pfh_cpp_ok:
  1421                              <1> 	; 20/07/2015
  1422 00004F0A 0F20D3              <1> 	mov	ebx, cr2
  1423 00004F0D E8A6020000          <1> 	call 	add_to_swap_queue
  1424                              <1> 	;
  1425                              <1> 	; The new PTE (which contains the new page) will be added to 
  1426                              <1> 	; the swap queue, here. 
  1427                              <1> 	; (Later, if memory will become insufficient, 
  1428                              <1> 	; one page will be swapped out which is at the head of 
  1429                              <1> 	; the swap queue by using FIFO and access check methods.)
  1430                              <1> 	;
  1431 00004F12 31C0                <1> 	xor	eax, eax  ; 0
  1432                              <1> 	;
  1433                              <1> pfh_err_retn:
  1434 00004F14 59                  <1> 	pop	ecx
  1435 00004F15 5A                  <1> 	pop	edx
  1436 00004F16 5B                  <1> 	pop	ebx
  1437 00004F17 C3                  <1> 	retn 
  1438                              <1> 	
  1439                              <1> pfh_im_err:
  1440 00004F18 B8E4000000          <1> 	mov	eax, ERR_MAJOR_PF + ERR_MINOR_IM ; Error code in AX
  1441                              <1> 			; Major (Primary) Error: Page Fault
  1442                              <1> 			; Minor (Secondary) Error: Insufficient Memory !
  1443 00004F1D EBF5                <1> 	jmp	short pfh_err_retn
  1444                              <1> 
  1445                              <1> 
  1446                              <1> pfh_p_err: ; 09/03/2015
  1447                              <1> pfh_pv_err:
  1448                              <1> 	; Page fault was caused by a protection-violation
  1449 00004F1F B8E6000000          <1> 	mov	eax, ERR_MAJOR_PF + ERR_MINOR_PV ; Error code in AX
  1450                              <1> 			; Major (Primary) Error: Page Fault
  1451                              <1> 			; Minor (Secondary) Error: Protection violation !
  1452 00004F24 F9                  <1> 	stc
  1453 00004F25 EBED                <1> 	jmp	short pfh_err_retn
  1454                              <1> 
  1455                              <1> copy_page:
  1456                              <1> 	; 22/09/2015
  1457                              <1> 	; 21/09/2015
  1458                              <1> 	; 19/09/2015
  1459                              <1> 	; 07/09/2015
  1460                              <1> 	; 31/08/2015
  1461                              <1> 	; 20/07/2015
  1462                              <1> 	; 05/05/2015
  1463                              <1> 	; 03/05/2015
  1464                              <1> 	; 18/04/2015
  1465                              <1> 	; 12/04/2015
  1466                              <1> 	; 30/10/2014
  1467                              <1> 	; 18/10/2014 (Retro UNIX 386 v1 - beginning)
  1468                              <1> 	;
  1469                              <1> 	; INPUT -> 
  1470                              <1> 	;	EBX = Virtual (linear) address of source page
  1471                              <1> 	;	     (Page fault address)
  1472                              <1> 	; OUTPUT ->
  1473                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
  1474                              <1> 	;	(corresponding PAGE TABLE ENTRY is mapped/set)
  1475                              <1> 	;	EAX = 0 (CF = 1) 
  1476                              <1> 	;		if there is not a free page to be allocated
  1477                              <1> 	;	(page content of the source page will be copied
  1478                              <1> 	;	onto the target/new page) 	
  1479                              <1> 	;
  1480                              <1> 	; Modified Registers -> ecx, ebx (except EAX)
  1481                              <1> 	;	
  1482 00004F27 56                  <1> 	push	esi
  1483 00004F28 57                  <1> 	push	edi
  1484                              <1> 	;push	ebx
  1485                              <1> 	;push	ecx
  1486 00004F29 31F6                <1> 	xor 	esi, esi
  1487 00004F2B C1EB0C              <1> 	shr	ebx, 12 ; shift 12 bits right to get PDE & PTE numbers
  1488 00004F2E 89D9                <1> 	mov	ecx, ebx ; save page fault address (as 12 bit shifted)
  1489 00004F30 C1EB08              <1> 	shr	ebx, 8	 ; shift 8 bits right and then
  1490 00004F33 80E3FC              <1> 	and	bl, 0FCh ; mask lower 2 bits to get PDE offset	
  1491 00004F36 89DF                <1> 	mov 	edi, ebx ; save it for the parent of current process
  1492 00004F38 031D[545D0100]      <1> 	add	ebx, [u.pgdir] ; EBX points to the relevant page dir entry 
  1493 00004F3E 8B03                <1> 	mov	eax, [ebx] ; physical (base) address of the page table
  1494 00004F40 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits 	
  1495 00004F44 89CB                <1> 	mov	ebx, ecx   ; (restore higher 20 bits of page fault address)
  1496 00004F46 81E3FF030000        <1> 	and	ebx, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1497 00004F4C 66C1E302            <1> 	shl	bx, 2	   ; shift 2 bits left to get PTE offset
  1498 00004F50 01C3                <1> 	add	ebx, eax   ; EBX points to the relevant page table entry 
  1499                              <1> 	; 07/09/2015
  1500 00004F52 66F7030002          <1>         test    word [ebx], PTE_DUPLICATED ; (Does current process share this
  1501                              <1> 				     ; read only page as a child process?)	
  1502 00004F57 7509                <1> 	jnz	short cpp_0 ; yes
  1503 00004F59 8B0B                <1> 	mov	ecx, [ebx] ; PTE value
  1504 00004F5B 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h  ; clear page attributes
  1505 00004F60 EB32                <1> 	jmp	short cpp_1
  1506                              <1> cpp_0:
  1507 00004F62 89FE                <1> 	mov	esi, edi
  1508 00004F64 0335[585D0100]      <1> 	add	esi, [u.ppgdir] ; the parent's page directory entry
  1509 00004F6A 8B06                <1> 	mov	eax, [esi] ; physical (base) address of the page table
  1510 00004F6C 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1511 00004F70 89CE                <1> 	mov	esi, ecx   ; (restore higher 20 bits of page fault address)	
  1512 00004F72 81E6FF030000        <1> 	and	esi, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1513 00004F78 66C1E602            <1> 	shl	si, 2	   ; shift 2 bits left to get PTE offset
  1514 00004F7C 01C6                <1> 	add	esi, eax   ; EDX points to the relevant page table entry  	
  1515 00004F7E 8B0E                <1> 	mov	ecx, [esi] ; PTE value of the parent process
  1516                              <1> 	; 21/09/2015
  1517 00004F80 8B03                <1> 	mov	eax, [ebx] ; PTE value of the child process
  1518 00004F82 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear page attributes	
  1519                              <1> 	;
  1520 00004F86 F6C101              <1> 	test	cl, PTE_A_PRESENT ; is it a present/valid page ?
  1521 00004F89 7424                <1> 	jz	short cpp_3 ; the parent's page is not same page  	
  1522                              <1> 	;
  1523 00004F8B 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h ; clear page attributes
  1524 00004F90 39C8                <1> 	cmp	eax, ecx   ; Same page?	
  1525 00004F92 751B                <1> 	jne	short cpp_3 ; Parent page and child page are not same 
  1526                              <1> 			    ; Convert child's page to writable page
  1527                              <1> cpp_1:
  1528 00004F94 E8E0FBFFFF          <1> 	call	allocate_page
  1529 00004F99 721A                <1> 	jc	short cpp_4 ; 'insufficient memory' error
  1530 00004F9B 21F6                <1> 	and	esi, esi    ; check ESI is valid or not
  1531 00004F9D 7405                <1> 	jz	short cpp_2
  1532                              <1> 		; Convert read only page to writable page 
  1533                              <1> 		;(for the parent of the current process)
  1534                              <1> 	;and	word [esi], PTE_A_CLEAR ; 0F000h
  1535                              <1> 	; 22/09/2015
  1536 00004F9F 890E                <1> 	mov	[esi], ecx
  1537 00004FA1 800E07              <1> 	or	byte [esi], PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER
  1538                              <1> 				 ; 1+2+4 = 7
  1539                              <1> cpp_2:
  1540 00004FA4 89C7                <1> 	mov	edi, eax ; new page address of the child process
  1541                              <1> 	; 07/09/2015
  1542 00004FA6 89CE                <1> 	mov	esi, ecx ; the page address of the parent process
  1543 00004FA8 B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
  1544 00004FAD F3A5                <1> 	rep	movsd ; 31/08/2015
  1545                              <1> cpp_3:		
  1546 00004FAF 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER ; 1+2+4 = 7
  1547 00004FB1 8903                <1> 	mov	[ebx], eax ; Update PTE
  1548 00004FB3 28C0                <1> 	sub	al, al ; clear attributes
  1549                              <1> cpp_4:
  1550                              <1> 	;pop	ecx
  1551                              <1> 	;pop	ebx
  1552 00004FB5 5F                  <1> 	pop	edi
  1553 00004FB6 5E                  <1> 	pop	esi
  1554 00004FB7 C3                  <1> 	retn
  1555                              <1> 
  1556                              <1> ;; 28/04/2015
  1557                              <1> ;; 24/10/2014
  1558                              <1> ;; 21/10/2014 (Retro UNIX 386 v1 - beginning)
  1559                              <1> ;; SWAP_PAGE_QUEUE (4096 bytes)
  1560                              <1> ;;
  1561                              <1> ;;   0000   0001   0002   0003   ....   1020   1021   1022   1023	
  1562                              <1> ;; +------+------+------+------+-    -+------+------+------+------+
  1563                              <1> ;; |  pg1 |  pg2 |  pg3 |  pg4 | .... |pg1021|pg1022|pg1023|pg1024|
  1564                              <1> ;; +------+------+------+------+-    -+------+------+------+------+    
  1565                              <1> ;;
  1566                              <1> ;; [swpq_last] = 0 to 4096 (step 4) -> the last position on the queue
  1567                              <1> ;;
  1568                              <1> ;; Method:
  1569                              <1> ;;	Swap page queue is a list of allocated pages with physical
  1570                              <1> ;;	addresses (system mode virtual adresses = physical addresses).
  1571                              <1> ;;	It is used for 'swap_in' and 'swap_out' procedures.
  1572                              <1> ;;	When a new page is being allocated, swap queue is updated
  1573                              <1> ;;	by 'swap_queue_shift' procedure, header of the queue (offset 0)
  1574                              <1> ;;	is checked for 'accessed' flag. If the 1st page on the queue
  1575                              <1> ;;	is 'accessed' or 'read only', it is dropped from the list;
  1576                              <1> ;;	other pages from the 2nd to the last (in [swpq_last]) shifted
  1577                              <1> ;; 	to head then the 2nd page becomes the 1st and '[swpq_last]' 
  1578                              <1> ;;	offset value becomes it's previous offset value - 4.
  1579                              <1> ;;	If the 1st page of the swap page queue is not 'accessed'	
  1580                              <1> ;;	the queue/list is not shifted.
  1581                              <1> ;;	After the queue/list shift, newly allocated page is added
  1582                              <1> ;;	to the tail of the queue at the [swpq_count*4] position.
  1583                              <1> ;;	But, if [swpq_count] > 1023, the newly allocated page
  1584                              <1> ;;	will not be added to the tail of swap page queue.  		 
  1585                              <1> ;;	
  1586                              <1> ;;	During 'swap_out' procedure, swap page queue is checked for
  1587                              <1> ;;	the first non-accessed, writable page in the list, 
  1588                              <1> ;;	from the head to the tail. The list is shifted to left 
  1589                              <1> ;;	(to the head) till a non-accessed page will be found in the list.
  1590                              <1> ;;	Then, this page	is swapped out (to disk) and then it is dropped
  1591                              <1> ;;	from the list by a final swap queue shift. [swpq_count] value
  1592                              <1> ;;	is changed. If all pages on the queue' are 'accessed', 
  1593                              <1> ;;	'insufficient memory' error will be returned ('swap_out' 
  1594                              <1> ;;	procedure will be failed)...
  1595                              <1> ;;
  1596                              <1> ;;	Note: If the 1st page of the queue is an 'accessed' page,
  1597                              <1> ;;	'accessed' flag of the page will be reset (0) and that page
  1598                              <1> ;;	(PTE) will be added to the tail of the queue after
  1599                              <1> ;;	the check, if [swpq_count] < 1023. If [swpq_count] = 1024
  1600                              <1> ;;	the queue will be rotated and the PTE in the head will be
  1601                              <1> ;;	added to the tail after resetting 'accessed' bit. 
  1602                              <1> ;;
  1603                              <1> ;;
  1604                              <1> ;;	
  1605                              <1> ;; SWAP DISK/FILE (with 4096 bytes swapped page blocks)
  1606                              <1> ;;
  1607                              <1> ;;  00000000  00000004  00000008  0000000C   ...   size-8    size-4
  1608                              <1> ;; +---------+---------+---------+---------+-- --+---------+---------+
  1609                              <1> ;; |descriptr| page(1) | page(2) | page(3) | ... |page(n-1)| page(n) |
  1610                              <1> ;; +---------+---------+---------+---------+-- --+---------+---------+    
  1611                              <1> ;;
  1612                              <1> ;; [swpd_next] = the first free block address in swapped page records
  1613                              <1> ;;    		 for next free block search by 'swap_out' procedure.
  1614                              <1> ;; [swpd_size] = swap disk/file size in sectors (512 bytes)
  1615                              <1> ;;		 NOTE: max. possible swap disk size is 1024 GB
  1616                              <1> ;; 		 (entire swap space must be accessed by using
  1617                              <1> ;;		 31 bit offset address) 
  1618                              <1> ;; [swpd_free] = free block (4096 bytes) count in swap disk/file space
  1619                              <1> ;; [swpd_start] = absolute/start address of the swap disk/file
  1620                              <1> ;;		  0 for file, or beginning sector of the swap partition
  1621                              <1> ;; [swp_drv] = logical drive description table addr. of swap disk/file
  1622                              <1> ;;
  1623                              <1> ;; 					
  1624                              <1> ;; Method:
  1625                              <1> ;;	When the memory (ram) becomes insufficient, page allocation
  1626                              <1> ;;	procedure swaps out a page from memory to the swap disk 
  1627                              <1> ;;	(partition) or swap file to get a new free page at the memory.
  1628                              <1> ;;	Swapping out is performed by using swap page queue.
  1629                              <1> ;;
  1630                              <1> ;; 	Allocation block size of swap disk/file is equal to page size
  1631                              <1> ;;	(4096 bytes). Swapping address (in sectors) is recorded
  1632                              <1> ;;	into relevant page file entry as 31 bit physical (logical)
  1633                              <1> ;;	offset address as 1 bit shifted to left for present flag (0).
  1634                              <1> ;;	Swapped page address is between 1 and swap disk/file size - 4.	  
  1635                              <1> ;;	Absolute physical (logical) address of the swapped page is 
  1636                              <1> ;;	calculated by adding offset value to the swap partition's 
  1637                              <1> ;;	start address. If the swap device (disk) is a virtual disk 
  1638                              <1> ;;	or it is a file, start address of the swap disk/volume is 0, 
  1639                              <1> ;;	and offset value is equal to absolute (physical or logical)
  1640                              <1> ;;	address/position. (It has not to be ZERO if the swap partition 
  1641                              <1> ;;	is in a partitioned virtual hard disk.) 
  1642                              <1> ;;
  1643                              <1> ;;	Note: Swap addresses are always specified/declared in sectors, 
  1644                              <1> ;;	not in bytes or	in blocks/zones/clusters (4096 bytes) as unit.
  1645                              <1> ;;
  1646                              <1> ;;	Swap disk/file allocation is mapped via 'Swap Allocation Table'
  1647                              <1> ;;	at memory as similar to 'Memory Allocation Table'.
  1648                              <1> ;;
  1649                              <1> ;;	Every bit of Swap Allocation Table repsesents one swap block
  1650                              <1> ;;	(equal to page size) respectively. Bit 0 of the S.A.T. byte 0
  1651                              <1> ;;	is reserved for swap disk/file block 0 as descriptor block
  1652                              <1> ;;	(also for compatibility with PTE). If bit value is ZERO,
  1653                              <1> ;;	it means relevant (respective) block is in use, and, 
  1654                              <1> ;;	of course, if bit value is 1, it means relevant (respective)
  1655                              <1> ;;      swap disk/file block is free.
  1656                              <1> ;;	For example: bit 1 of the byte 128 repsesents block 1025 
  1657                              <1> ;;	(128*8+1) or sector (offset) 8200 on the swap disk or
  1658                              <1> ;;	byte (offset/position) 4198400 in the swap file. 
  1659                              <1> ;;	4GB swap space is represented via 128KB Swap Allocation Table.
  1660                              <1> ;;	Initial layout of Swap Allocation Table is as follows:
  1661                              <1> ;;	------------------------------------------------------------
  1662                              <1> ;;	0111111111111111111111111 .... 11111111111111111111111111111
  1663                              <1> ;;	------------------------------------------------------------
  1664                              <1> ;;	(0 is reserved block, 1s represent free blocks respectively.)
  1665                              <1> ;;	(Note: Allocation cell/unit of the table is bit, not byte)
  1666                              <1> ;;
  1667                              <1> ;;	..............................................................
  1668                              <1> ;;
  1669                              <1> ;;	'swap_out' procedure checks 'free_swap_blocks' count at first,
  1670                              <1> ;;	then it searches Swap Allocation Table if free count is not
  1671                              <1> ;;	zero. From begining the [swpd_next] dword value, the first bit 
  1672                              <1> ;;	position with value of 1 on the table is converted to swap
  1673                              <1> ;;	disk/file offset address, in sectors (not 4096 bytes block).
  1674                              <1> ;;	'ldrv_write' procedure is called with ldrv (logical drive
  1675                              <1> ;;	number of physical swap disk or virtual swap disk)
  1676                              <1> ;;	number, sector offset (not absolute sector -LBA- number),
  1677                              <1> ;;	and sector count (8, 512*8 = 4096) and buffer adress
  1678                              <1> ;;	(memory page). That will be a direct disk write procedure.
  1679                              <1> ;;	(for preventing late memory allocation, significant waiting). 
  1680                              <1> ;;	If disk write procedure returns with error or free count of 
  1681                              <1> ;;	swap blocks is ZERO, 'swap_out' procedure will return with
  1682                              <1> ;;	'insufficient memory error' (cf=1). 
  1683                              <1> ;;
  1684                              <1> ;;	(Note: Even if free swap disk/file blocks was not zero,
  1685                              <1> ;;	any disk write error will not be fixed by 'swap_out' procedure,
  1686                              <1> ;;	in other words, 'swap_out' will not check the table for other
  1687                              <1> ;;	free blocks after a disk write error. It will return to 
  1688                              <1> ;;	the caller with error (CF=1) which means swapping is failed. 
  1689                              <1> ;;
  1690                              <1> ;;	After writing the page on to swap disk/file address/sector,
  1691                              <1> ;;	'swap_out' procesure returns with that swap (offset) sector
  1692                              <1> ;;	address (cf=0). 
  1693                              <1> ;;
  1694                              <1> ;;	..............................................................
  1695                              <1> ;;
  1696                              <1> ;;	'swap_in' procedure loads addressed (relevant) swap disk or
  1697                              <1> ;;	file sectors at specified memory page. Then page allocation
  1698                              <1> ;;	procedure updates relevant page table entry with 'present' 
  1699                              <1> ;;	attribute. If swap disk or file reading fails there is nothing
  1700                              <1> ;;	to do, except to terminate the process which is the owner of
  1701                              <1> ;;	the swapped page.
  1702                              <1> ;;
  1703                              <1> ;;	'swap_in' procedure sets the relevant/respective bit value
  1704                              <1> ;;	in the Swap Allocation Table (as free block). 'swap_in' also
  1705                              <1> ;;	updates [swpd_first] pointer if it is required.
  1706                              <1> ;;
  1707                              <1> ;;	..............................................................	 
  1708                              <1> ;;
  1709                              <1> ;;	Note: If [swap_enabled] value is ZERO, that means there is not
  1710                              <1> ;;	a swap disk or swap file in use... 'swap_in' and 'swap_out'
  1711                              <1> ;;	procedures ans 'swap page que' procedures will not be active...
  1712                              <1> ;;	'Insufficient memory' error will be returned by 'swap_out'
  1713                              <1> ;;	and 'general protection fault' will be returned by 'swap_in'
  1714                              <1> ;;	procedure, if it is called mistakenly (a wrong value in a PTE).		
  1715                              <1> ;;
  1716                              <1> 
  1717                              <1> swap_in:
  1718                              <1> 	; 31/08/2015
  1719                              <1> 	; 20/07/2015
  1720                              <1> 	; 28/04/2015
  1721                              <1> 	; 18/04/2015
  1722                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  1723                              <1> 	;
  1724                              <1> 	; INPUT -> 
  1725                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS OF THE MEMORY PAGE
  1726                              <1> 	;	EBP = VIRTUAL (LINEAR) ADDRESS (page fault address)
  1727                              <1> 	;	EAX = Offset Address for the swapped page on the
  1728                              <1> 	;	      swap disk or in the swap file.
  1729                              <1> 	;
  1730                              <1> 	; OUTPUT ->
  1731                              <1> 	;	EAX = 0 if loading at memory has been successful
  1732                              <1> 	;
  1733                              <1> 	;	CF = 1 -> swap disk reading error (disk/file not present
  1734                              <1> 	;		  or sector not present or drive not ready
  1735                              <1> 	;	     EAX = Error code
  1736                              <1> 	;	     [u.error] = EAX 
  1737                              <1> 	;		       = The last error code for the process
  1738                              <1> 	;		         (will be reset after returning to user)	  
  1739                              <1> 	;
  1740                              <1> 	; Modified Registers -> EAX
  1741                              <1> 	;
  1742                              <1> 
  1743 00004FB8 833D[FE5E0100]00    <1>         cmp     dword [swp_drv], 0
  1744 00004FBF 7646                <1> 	jna	short swpin_dnp_err
  1745                              <1> 
  1746 00004FC1 3B05[025F0100]      <1> 	cmp	eax, [swpd_size]
  1747 00004FC7 734A                <1> 	jnb	short swpin_snp_err
  1748                              <1> 
  1749 00004FC9 56                  <1> 	push	esi
  1750 00004FCA 53                  <1> 	push	ebx
  1751 00004FCB 51                  <1> 	push	ecx
  1752 00004FCC 8B35[FE5E0100]      <1> 	mov	esi, [swp_drv]	
  1753 00004FD2 B908000000          <1> 	mov	ecx, PAGE_SIZE / LOGIC_SECT_SIZE  ; 8 !
  1754                              <1> 		; Note: Even if corresponding physical disk's sector 
  1755                              <1> 		; size different than 512 bytes, logical disk sector
  1756                              <1> 		; size is 512 bytes and disk reading procedure
  1757                              <1> 		; will be performed for reading 4096 bytes
  1758                              <1> 		; (2*2048, 8*512). 
  1759                              <1> 	; ESI = Logical disk description table address
  1760                              <1> 	; EBX = Memory page (buffer) address (physical!)
  1761                              <1> 	; EAX = Sector adress (offset address, logical sector number)
  1762                              <1> 	; ECX = Sector count ; 8 sectors
  1763 00004FD7 50                  <1> 	push	eax
  1764 00004FD8 E8AF020000          <1> 	call	logical_disk_read
  1765 00004FDD 58                  <1> 	pop	eax
  1766 00004FDE 730C                <1> 	jnc	short swpin_read_ok
  1767                              <1> 	;
  1768 00004FE0 B828000000          <1> 	mov	eax, SWP_DISK_READ_ERR ; drive not ready or read error
  1769 00004FE5 A3[645D0100]        <1> 	mov	[u.error], eax
  1770 00004FEA EB17                <1> 	jmp	short swpin_retn
  1771                              <1> 	;
  1772                              <1> swpin_read_ok:
  1773                              <1> 	; EAX = Offset address (logical sector number)
  1774 00004FEC E80D020000          <1> 	call	unlink_swap_block  ; Deallocate swap block	
  1775                              <1> 	;
  1776                              <1> 	; EBX = Memory page (buffer) address (physical!)
  1777                              <1> 	; 20/07/2015
  1778 00004FF1 89EB                <1> 	mov	ebx, ebp ; virtual address (page fault address)
  1779 00004FF3 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  1780 00004FF8 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno] ; current process number
  1781                              <1> 	; EBX = Virtual (Linear) address & process number combination
  1782 00004FFE E8DB000000          <1> 	call	swap_queue_shift
  1783                              <1> 	; eax = 0 ; 10/06/2016 (if ebx input > 0, eax output = 0)
  1784                              <1> 	;sub	eax, eax  ; 0 ; Error Code = 0  (no error)
  1785                              <1> 	; zf = 1
  1786                              <1> swpin_retn:
  1787 00005003 59                  <1> 	pop	ecx
  1788 00005004 5B                  <1> 	pop	ebx
  1789 00005005 5E                  <1> 	pop	esi
  1790 00005006 C3                  <1> 	retn
  1791                              <1> 
  1792                              <1> swpin_dnp_err:
  1793 00005007 B829000000          <1> 	mov	eax, SWP_DISK_NOT_PRESENT_ERR
  1794                              <1> swpin_err_retn:
  1795 0000500C A3[645D0100]        <1> 	mov	[u.error], eax
  1796 00005011 F9                  <1> 	stc
  1797 00005012 C3                  <1> 	retn
  1798                              <1> 
  1799                              <1> swpin_snp_err:
  1800 00005013 B82A000000          <1> 	mov	eax, SWP_SECTOR_NOT_PRESENT_ERR
  1801 00005018 EBF2                <1> 	jmp	short swpin_err_retn
  1802                              <1> 
  1803                              <1> swap_out:
  1804                              <1> 	; 10/06/2016
  1805                              <1> 	; 07/06/2016
  1806                              <1>         ; 23/05/2016
  1807                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1808                              <1> 	; 24/10/2014 - 31/08/2015 (Retro UNIX 386 v1)
  1809                              <1> 	;
  1810                              <1> 	; INPUT -> 
  1811                              <1> 	;	none
  1812                              <1> 	;
  1813                              <1> 	; OUTPUT ->
  1814                              <1> 	;	EAX = Physical page address (which is swapped out
  1815                              <1> 	;	      for allocating a new page)
  1816                              <1> 	;	CF = 1 -> swap disk writing error (disk/file not present
  1817                              <1> 	;		  or sector not present or drive not ready
  1818                              <1> 	;	     EAX = Error code
  1819                              <1> 	;	     [u.error] = EAX 
  1820                              <1> 	;		       = The last error code for the process
  1821                              <1> 	;		         (will be reset after returning to user)	  
  1822                              <1> 	;
  1823                              <1> 	; Modified Registers -> none (except EAX)
  1824                              <1> 	;
  1825 0000501A 66833D[FC5E0100]01  <1> 	cmp 	word [swpq_count], 1
  1826 00005022 0F82AF000000        <1>         jc      swpout_im_err ; 'insufficient memory'
  1827                              <1> 
  1828                              <1>         ;cmp    dword [swp_drv], 1
  1829                              <1> 	;jc	short swpout_dnp_err ; 'swap disk/file not present'
  1830                              <1> 
  1831 00005028 833D[065F0100]01    <1>         cmp     dword [swpd_free], 1
  1832 0000502F 0F828F000000        <1>         jc      swpout_nfspc_err ; 'no free space on swap disk'
  1833                              <1> 
  1834 00005035 53                  <1> 	push	ebx ; *
  1835                              <1> swpout_1:
  1836                              <1> 	; 10/06/2016
  1837 00005036 31DB                <1> 	xor	ebx, ebx ; shift the queue and return a PTE value
  1838 00005038 E8A1000000          <1> 	call	swap_queue_shift
  1839 0000503D 21C0                <1> 	and	eax, eax	; 0 = empty queue (improper entries)
  1840 0000503F 0F848A000000        <1>         jz      swpout_npts_err        ; There is not any proper PTE
  1841                              <1> 				       ; pointer in the swap queue
  1842                              <1> 	; EAX = PTE value of the page
  1843                              <1> 	; EBX = PTE address of the page
  1844 00005045 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1845                              <1> 	;
  1846                              <1> 	; 07/06/2016
  1847                              <1> 	; 19/05/2016
  1848                              <1> 	; check this page is in timer events or not
  1849                              <1> 	
  1850                              <1> swpout_timer_page_0:
  1851 00005049 52                  <1> 	push	edx ; **
  1852                              <1> 
  1853                              <1> 	; 07/06/2016
  1854 0000504A 803D[774F0100]00    <1> 	cmp	byte [timer_events], 0 
  1855 00005051 762F                <1> 	jna	short swpout_2
  1856                              <1> 	;
  1857 00005053 8A15[774F0100]      <1> 	mov	dl, [timer_events]
  1858                              <1> 
  1859 00005059 51                  <1> 	push	ecx ; ***
  1860 0000505A 53                  <1> 	push	ebx ; ****
  1861 0000505B BB[FC5D0100]        <1> 	mov	ebx, timer_set ; beginning address of timer event
  1862                              <1> 			       ; structures 
  1863                              <1> swpout_timer_page_1:
  1864 00005060 8A0B                <1> 	mov	cl, [ebx]
  1865 00005062 08C9                <1> 	or	cl, cl ; 0 = free, >0 = process number
  1866 00005064 7415                <1> 	jz	short swpout_timer_page_3
  1867 00005066 8B4B0C              <1> 	mov	ecx, [ebx+12] ; response (signal return) address
  1868 00005069 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; clear offset part (right 12 bits)
  1869                              <1> 				; of the response byte address, to
  1870                              <1> 				; get beginning of the page address)
  1871 0000506E 39C8                <1> 	cmp	eax, ecx
  1872 00005070 7505                <1> 	jne	short swpout_timer_page_2 ; not same page
  1873                              <1> 	
  1874                              <1> 	; !same page!
  1875                              <1> 	;
  1876                              <1> 	; NOTE: // 19/05/2016 // - TRDOS 386 feature only ! -
  1877                              <1> 	; This page will be used by the kernel to put timer event
  1878                              <1> 	; response (signal return) byte at the requested address;
  1879                              <1> 	; in order to prevent a possible wrong write (while
  1880                              <1> 	; this page is swapped out) on physical memory,
  1881                              <1> 	; we must protect this page against to be swapped out!
  1882                              <1> 	;
  1883 00005072 5B                  <1> 	pop	ebx ; ****
  1884 00005073 59                  <1> 	pop	ecx ; ***
  1885 00005074 5A                  <1> 	pop	edx ; **
  1886 00005075 EBBF                <1> 	jmp	short swpout_1	; do not swap out this page !
  1887                              <1>  
  1888                              <1> swpout_timer_page_2:
  1889                              <1> 	; 07/06/2016
  1890 00005077 FECA                <1> 	dec	dl
  1891 00005079 7405                <1> 	jz	short swpout_timer_page_4
  1892                              <1> swpout_timer_page_3:
  1893                              <1> 	;cmp	ebx, timer_set + 240 ; last timer event (15*16) 
  1894                              <1> 	;jnb	short swpout_timer_page_4
  1895 0000507B 83C310              <1> 	add	ebx, 16
  1896 0000507E EBE0                <1> 	jmp	short swpout_timer_page_1	
  1897                              <1> 
  1898                              <1> swpout_timer_page_4:
  1899 00005080 5B                  <1> 	pop	ebx ; ****
  1900 00005081 59                  <1> 	pop	ecx ; ***
  1901                              <1> swpout_2:
  1902 00005082 89DA                <1> 	mov	edx, ebx	       ; Page table entry address	
  1903 00005084 89C3                <1> 	mov	ebx, eax	       ; Buffer (Page) Address				
  1904                              <1> 	;
  1905 00005086 E8A6010000          <1> 	call	link_swap_block
  1906 0000508B 7304                <1> 	jnc	short swpout_3	       ; It may not be needed here	
  1907                              <1> 				       ; because [swpd_free] value
  1908                              <1> 				       ; was checked at the beginging. 	
  1909 0000508D 5A                  <1> 	pop	edx ; **
  1910 0000508E 5B                  <1> 	pop	ebx ; *
  1911 0000508F EB33                <1> 	jmp	short swpout_nfspc_err 
  1912                              <1> swpout_3:
  1913 00005091 A900000080          <1> 	test	eax, 80000000h ; test bit 31 (this may not be needed!)
  1914 00005096 752C                <1> 	jnz	short swpout_nfspc_err  ; 10/06/2016 (bit 31 = 1 !)
  1915                              <1> 	;	
  1916 00005098 56                  <1> 	push	esi ; **
  1917 00005099 51                  <1> 	push	ecx ; ***
  1918 0000509A 50                  <1> 	push	eax ; sector address ; (31 bit !, bit 31 = 0)
  1919 0000509B 8B35[FE5E0100]      <1> 	mov	esi, [swp_drv]	
  1920 000050A1 B908000000          <1> 	mov	ecx, PAGE_SIZE / LOGIC_SECT_SIZE  ; 8 !
  1921                              <1> 		; Note: Even if corresponding physical disk's sector 
  1922                              <1> 		; size different than 512 bytes, logical disk sector
  1923                              <1> 		; size is 512 bytes and disk writing procedure
  1924                              <1> 		; will be performed for writing 4096 bytes
  1925                              <1> 		; (2*2048, 8*512). 
  1926                              <1> 	; ESI = Logical disk description table address
  1927                              <1> 	; EBX = Buffer (Page) address
  1928                              <1> 	; EAX = Sector adress (offset address, logical sector number)
  1929                              <1> 	; ECX = Sector count ; 8 sectors
  1930                              <1> 	; edx = PTE address
  1931 000050A6 E8E2010000          <1> 	call	logical_disk_write
  1932                              <1> 	; edx = PTE address
  1933 000050AB 59                  <1> 	pop	ecx ; sector address	
  1934 000050AC 730C                <1> 	jnc	short swpout_write_ok
  1935                              <1> 	;
  1936                              <1> 	;; call	unlink_swap_block ; this block must be left as 'in use'
  1937                              <1> swpout_dw_err:
  1938 000050AE B82C000000          <1> 	mov	eax, SWP_DISK_WRITE_ERR ; drive not ready or write error
  1939 000050B3 A3[645D0100]        <1> 	mov	[u.error], eax
  1940 000050B8 EB06                <1> 	jmp	short swpout_retn
  1941                              <1> 	;
  1942                              <1> swpout_write_ok:
  1943                              <1> 	; EBX = Buffer (page) address
  1944                              <1> 	; EDX = Page Table Entry address
  1945                              <1> 	; ECX = Swap disk sector (file block) address (31 bit)
  1946 000050BA D1E1                <1> 	shl 	ecx, 1  ; 31 bit sector address from bit 1 to bit 31 
  1947 000050BC 890A                <1> 	mov 	[edx], ecx 
  1948                              <1> 		; bit 0 = 0 (swapped page)
  1949 000050BE 89D8                <1> 	mov	eax, ebx
  1950                              <1> swpout_retn:
  1951 000050C0 59                  <1> 	pop	ecx ; ***
  1952 000050C1 5E                  <1> 	pop	esi ; **
  1953 000050C2 5B                  <1> 	pop	ebx ; *
  1954 000050C3 C3                  <1> 	retn
  1955                              <1> 
  1956                              <1> ;swpout_dnp_err:
  1957                              <1> ;	mov	eax, SWP_DISK_NOT_PRESENT_ERR ; disk not present
  1958                              <1> ;	jmp	short swpout_err_retn
  1959                              <1> swpout_nfspc_err:
  1960 000050C4 B82B000000          <1> 	mov	eax, SWP_NO_FREE_SPACE_ERR ; no free space
  1961                              <1> swpout_err_retn:
  1962 000050C9 A3[645D0100]        <1> 	mov	[u.error], eax
  1963                              <1> 	;stc
  1964 000050CE C3                  <1> 	retn
  1965                              <1> swpout_npts_err:
  1966 000050CF B82D000000          <1> 	mov	eax, SWP_NO_PAGE_TO_SWAP_ERR
  1967 000050D4 5B                  <1> 	pop	ebx
  1968 000050D5 EBF2                <1> 	jmp	short swpout_err_retn
  1969                              <1> swpout_im_err:
  1970 000050D7 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; insufficient (out of) memory
  1971 000050DC EBEB                <1> 	jmp	short swpout_err_retn
  1972                              <1> 
  1973                              <1> swap_queue_shift:
  1974                              <1> 	; 26/03/2017
  1975                              <1> 	; 10/06/2016
  1976                              <1> 	; 09/06/2016 - TRDOS 386 (TRDOS v2.0)
  1977                              <1> 	; 23/10/2014 - 20/07/2015 (Retro UNIX 386 v1)
  1978                              <1> 	;
  1979                              <1> 	; INPUT ->
  1980                              <1> 	;	EBX = Virtual (linear) address (bit 12 to 31) 
  1981                              <1> 	;	      and process number combination (bit 0 to 11)
  1982                              <1> 	;	EBX = 0 -> shift/drop from the head (offset 0)
  1983                              <1> 	;	
  1984                              <1> 	; OUTPUT ->
  1985                              <1> 	;	If EBX input > 0 
  1986                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  1987                              <1> 	; 	   from the tail to the head, up to entry offset
  1988                              <1> 	; 	   which points to EBX input value or nothing
  1989                              <1> 	;	   to do if EBX value is not found on the queue.
  1990                              <1> 	;	   (The entry -with EBX value- will be removed
  1991                              <1> 	;	   from the queue if it is found.)
  1992                              <1> 	;
  1993                              <1> 	;	   EAX = 0		
  1994                              <1> 	;
  1995                              <1> 	;	If EBX input = 0
  1996                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  1997                              <1> 	; 	   from the tail to the head, if the PTE address
  1998                              <1> 	;	   which is pointed in head of the queue is marked
  1999                              <1> 	;	   as "accessed" or it is marked as "non present".
  2000                              <1> 	;	   (If "accessed" flag of the PTE -which is pointed
  2001                              <1> 	;	   in the head- is set -to 1-, it will be reset
  2002                              <1> 	;	   -to 0- and then, the queue will be rotated 
  2003                              <1> 	;	   -without dropping pointer of the PTE from 
  2004                              <1> 	;	   the queue- for 4 bytes on head to tail direction.
  2005                              <1> 	;	   Pointer in the head will be moved into the tail,
  2006                              <1> 	;	   other PTEs will be shifted on head direction.)
  2007                              <1> 	;
  2008                              <1> 	;	   Swap queue will be shifted up to the first
  2009                              <1> 	;	   'present' or 'non accessed' page will be found
  2010                              <1> 	;	   (as pointed) on the queue head (then it will be
  2011                              <1>         ;          removed/dropped from the queue).
  2012                              <1> 	;
  2013                              <1> 	;	   EAX (> 0) = PTE value of the page which is
  2014                              <1> 	;		 (it's pointer -virtual address-) dropped
  2015                              <1> 	;		 (removed) from swap queue.
  2016                              <1> 	;	   EBX = PTE address of the page (if EAX > 0)
  2017                              <1> 	;	         which is (it's pointer -virtual address-)
  2018                              <1> 	;		 dropped (removed) from swap queue.
  2019                              <1> 	;
  2020                              <1> 	;	   EAX = 0 -> empty swap queue ! 
  2021                              <1> 	;
  2022                              <1> 	; Modified Registers -> EAX, EBX
  2023                              <1> 	;
  2024 000050DE 0FB705[FC5E0100]    <1> 	movzx   eax, word [swpq_count]  ; Max. 1024
  2025 000050E5 6621C0              <1> 	and	ax, ax
  2026 000050E8 7431                <1> 	jz	short swpqs_retn
  2027 000050EA 57                  <1> 	push	edi
  2028 000050EB 56                  <1> 	push	esi
  2029 000050EC 51                  <1> 	push	ecx
  2030 000050ED BE00E00800          <1> 	mov	esi, swap_queue
  2031 000050F2 89C1                <1> 	mov	ecx, eax
  2032 000050F4 09DB                <1> 	or	ebx, ebx
  2033 000050F6 7424                <1> 	jz	short swpqs_7
  2034                              <1> swpqs_1:
  2035 000050F8 AD                  <1> 	lodsd
  2036 000050F9 39D8                <1> 	cmp	eax, ebx
  2037 000050FB 7406                <1> 	je	short swpqs_2
  2038 000050FD E2F9                <1> 	loop	swpqs_1
  2039                              <1> 	; 10/06/2016
  2040 000050FF 29C0                <1> 	sub	eax, eax 
  2041 00005101 EB15                <1> 	jmp	short swpqs_6
  2042                              <1> swpqs_2:
  2043 00005103 89F7                <1> 	mov	edi, esi
  2044 00005105 83EF04              <1> 	sub 	edi, 4
  2045                              <1> swpqs_3:
  2046 00005108 66FF0D[FC5E0100]    <1> 	dec	word [swpq_count]
  2047 0000510F 7403                <1> 	jz	short swpqs_5
  2048                              <1> swpqs_4:
  2049 00005111 49                  <1> 	dec 	ecx
  2050 00005112 F3A5                <1> 	rep	movsd	; shift up (to the head)
  2051                              <1> swpqs_5:
  2052 00005114 31C0                <1> 	xor	eax, eax
  2053 00005116 8907                <1> 	mov	[edi], eax
  2054                              <1> swpqs_6:
  2055 00005118 59                  <1> 	pop	ecx
  2056 00005119 5E                  <1> 	pop	esi
  2057 0000511A 5F                  <1> 	pop	edi
  2058                              <1> swpqs_retn:
  2059 0000511B C3                  <1> 	retn		
  2060                              <1> swpqs_7:
  2061 0000511C 89F7                <1> 	mov	edi, esi ; head
  2062 0000511E AD                  <1> 	lodsd
  2063                              <1> 	; 20/07/2015
  2064 0000511F 89C3                <1> 	mov	ebx, eax
  2065 00005121 81E300F0FFFF        <1> 	and	ebx, ~PAGE_OFF ; ~0FFFh 
  2066                              <1> 		      ; ebx = virtual address (at page boundary)	
  2067 00005127 25FF0F0000          <1> 	and	eax, PAGE_OFF ; 0FFFh
  2068                              <1> 		      ; ax = process number (1 to 4095)
  2069 0000512C 3A05[4F5D0100]      <1> 	cmp	al, [u.uno]
  2070                              <1> 		; Max. 16 (nproc) processes for Retro UNIX 386 v1
  2071 00005132 7507                <1> 	jne	short swpqs_8
  2072 00005134 A1[545D0100]        <1> 	mov	eax, [u.pgdir]
  2073 00005139 EB28                <1> 	jmp	short swpqs_9
  2074                              <1> swpqs_8:
  2075                              <1> 	; 09/06/2016
  2076 0000513B 80B8[4B5A0100]00    <1> 	cmp	byte [eax+p.stat-1], 0
  2077 00005142 76C4                <1> 	jna	short swpqs_3     ; free (or terminated) process
  2078 00005144 80B8[4B5A0100]02    <1> 	cmp	byte [eax+p.stat-1], 2 ; waiting
  2079 0000514B 77BB                <1> 	ja	short swpqs_3 	  ; zombie (3) or undefined ?	
  2080                              <1> 
  2081                              <1> 	;shl	ax, 2
  2082 0000514D C0E002              <1> 	shl	al, 2
  2083 00005150 8B80[585A0100]      <1> 	mov 	eax, [eax+p.upage-4]
  2084 00005156 09C0                <1> 	or	eax, eax
  2085 00005158 74AE                <1> 	jz	short swpqs_3 ; invalid upage
  2086 0000515A 83C05C              <1> 	add	eax, u.pgdir - user
  2087                              <1> 			 ; u.pgdir value for the process
  2088                              <1> 			 ; is in [eax]
  2089 0000515D 8B00                <1> 	mov	eax, [eax]
  2090 0000515F 21C0                <1> 	and	eax, eax
  2091 00005161 74A5                <1> 	jz	short swpqs_3 ; invalid page directory
  2092                              <1> swpqs_9:
  2093 00005163 52                  <1> 	push	edx
  2094                              <1> 	; eax = page directory
  2095                              <1> 	; ebx = virtual address
  2096 00005164 E82BFBFFFF          <1> 	call	get_pte
  2097 00005169 89D3                <1> 	mov	ebx, edx	; PTE address
  2098 0000516B 5A                  <1> 	pop	edx
  2099                              <1> 	; 10/06/2016
  2100 0000516C 723A                <1> 	jc	short swpqs_13 ; empty PDE
  2101                              <1> 	; EAX = PTE value
  2102 0000516E A801                <1> 	test	al, PTE_A_PRESENT ; bit 0 = 1
  2103 00005170 7436                <1> 	jz	short swpqs_13  ; Drop non-present page
  2104                              <1> 			        ; from the queue (head)
  2105 00005172 A802                <1> 	test	al, PTE_A_WRITE	; bit 1 = 0 (read only)
  2106 00005174 7432                <1> 	jz	short swpqs_13  ; Drop read only page
  2107                              <1> 			        ; from the queue (head) 	
  2108                              <1> 	;test	al, PTE_A_ACCESS ; bit 5 = 1 (Accessed)
  2109                              <1> 	;jnz	short swpqs_11  ; present
  2110                              <1> 			        ; accessed page
  2111 00005176 0FBAF005            <1>         btr     eax, PTE_A_ACCESS_BIT ; reset 'accessed' bit
  2112 0000517A 7210                <1> 	jc	short swpqs_11  ; accessed page
  2113                              <1> 
  2114 0000517C 49                  <1> 	dec	ecx
  2115 0000517D 66890D[FC5E0100]    <1> 	mov	[swpq_count], cx
  2116 00005184 7402                <1>         jz      short swpqs_10
  2117                              <1> 		; esi = head + 4
  2118                              <1> 		; edi = head
  2119 00005186 F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2120                              <1> swpqs_10:
  2121 00005188 890F                <1> 	mov	[edi], ecx ; 0
  2122 0000518A EB8C                <1> 	jmp	short swpqs_6 ; 26/03/2017
  2123                              <1> 
  2124                              <1> swpqs_11:
  2125 0000518C 8903                <1> 	mov	[ebx], eax     ; save changed attribute
  2126                              <1> 	; Rotation (head -> tail)
  2127 0000518E 49                  <1> 	dec	ecx     ; entry count -> last entry number		
  2128 0000518F 74F7                <1> 	jz	short swpqs_10
  2129                              <1> 		; esi = head + 4
  2130                              <1> 		; edi = head
  2131 00005191 8B07                <1> 	mov	eax, [edi] ; 20/07/2015
  2132 00005193 F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2133 00005195 8907                <1> 	mov	[edi], eax ; head -> tail ; [k] = [1]
  2134                              <1> 
  2135 00005197 668B0D[FC5E0100]    <1> 	mov	cx, [swpq_count]
  2136                              <1> 
  2137                              <1> swpqs_12:
  2138 0000519E BE00E00800          <1> 	mov	esi, swap_queue ; head
  2139 000051A3 E974FFFFFF          <1>         jmp     swpqs_7
  2140                              <1> 
  2141                              <1> swpqs_13:
  2142 000051A8 49                  <1> 	dec	ecx
  2143 000051A9 66890D[FC5E0100]    <1> 	mov	[swpq_count], cx
  2144 000051B0 0F845EFFFFFF        <1>         jz      swpqs_5
  2145 000051B6 EBE6                <1> 	jmp	short swpqs_12
  2146                              <1> 
  2147                              <1> add_to_swap_queue:
  2148                              <1> ; temporary - 16/09/2015
  2149 000051B8 C3                  <1> retn
  2150                              <1> 	; 20/02/2017
  2151                              <1> 	; 20/07/2015
  2152                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2153                              <1> 	;
  2154                              <1> 	; Adds new page to swap queue
  2155                              <1> 	; (page directories and page tables must not be added
  2156                              <1> 	; to swap queue)	
  2157                              <1> 	;
  2158                              <1> 	; INPUT ->
  2159                              <1> 	;	EBX = Linear (Virtual) addr for current process
  2160                              <1> 	;	[u.uno]
  2161                              <1> 	;	20/02/2017
  2162                              <1> 	;	(Linear address = CORE + user's virtual address)
  2163                              <1> 	;
  2164                              <1> 	; OUTPUT ->
  2165                              <1> 	;	EAX = [swpq_count]
  2166                              <1> 	;	      (after the PTE has been added)
  2167                              <1> 	;	EAX = 0 -> Swap queue is full, (1024 entries)
  2168                              <1> 	;	      the PTE could not be added.
  2169                              <1> 	;
  2170                              <1> 	; Modified Registers -> EAX
  2171                              <1> 	;
  2172 000051B9 53                  <1> 	push	ebx
  2173 000051BA 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2174 000051BF 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno] ; current process number
  2175 000051C5 E814FFFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2176                              <1> 				 ; it is already on the queue
  2177                              <1> 		; then add it to the tail of the queue
  2178 000051CA 0FB705[FC5E0100]    <1> 	movzx	eax, word [swpq_count]
  2179 000051D1 663D0004            <1> 	cmp	ax, 1024
  2180 000051D5 7205                <1> 	jb	short atsq_1
  2181 000051D7 6629C0              <1> 	sub	ax, ax
  2182 000051DA 5B                  <1> 	pop	ebx
  2183 000051DB C3                  <1> 	retn
  2184                              <1> atsq_1:
  2185 000051DC 56                  <1> 	push	esi
  2186 000051DD BE00E00800          <1> 	mov	esi, swap_queue
  2187 000051E2 6621C0              <1> 	and	ax, ax
  2188 000051E5 740A                <1> 	jz	short atsq_2
  2189 000051E7 66C1E002            <1> 	shl	ax, 2	; convert to offset
  2190 000051EB 01C6                <1> 	add	esi, eax
  2191 000051ED 66C1E802            <1> 	shr	ax, 2
  2192                              <1> atsq_2:
  2193 000051F1 6640                <1> 	inc	ax
  2194 000051F3 891E                <1> 	mov	[esi], ebx ; Virtual address + [u.uno] combination
  2195 000051F5 66A3[FC5E0100]      <1> 	mov	[swpq_count], ax
  2196 000051FB 5E                  <1> 	pop	esi
  2197 000051FC 5B                  <1> 	pop	ebx
  2198 000051FD C3                  <1> 	retn
  2199                              <1> 
  2200                              <1> unlink_swap_block:
  2201                              <1> 	; 15/09/2015
  2202                              <1> 	; 30/04/2015
  2203                              <1> 	; 18/04/2015
  2204                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2205                              <1> 	;
  2206                              <1> 	; INPUT -> 
  2207                              <1> 	;	EAX = swap disk/file offset address
  2208                              <1> 	;	      (bit 1 to bit 31)
  2209                              <1> 	; OUTPUT ->
  2210                              <1> 	;	[swpd_free] is increased
  2211                              <1> 	;	(corresponding SWAP DISK ALLOC. TABLE bit is SET)
  2212                              <1> 	;
  2213                              <1> 	; Modified Registers -> EAX
  2214                              <1> 	;
  2215 000051FE 53                  <1> 	push	ebx
  2216 000051FF 52                  <1> 	push	edx
  2217                              <1> 	;
  2218 00005200 C1E804              <1> 	shr	eax, SECTOR_SHIFT+1  ;3+1 ; shift sector address to 
  2219                              <1> 				     ; 3 bits right
  2220                              <1> 				     ; to get swap block/page number
  2221 00005203 89C2                <1> 	mov	edx, eax
  2222                              <1> 	; 15/09/2015
  2223 00005205 C1EA03              <1> 	shr	edx, 3		     ; to get offset to S.A.T.
  2224                              <1> 				     ; (1 allocation bit = 1 page)
  2225                              <1> 				     ; (1 allocation bytes = 8 pages)
  2226 00005208 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2227                              <1> 				     ; (to get 32 bit position)			
  2228                              <1> 	;
  2229 0000520B BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table address
  2230 00005210 01D3                <1> 	add	ebx, edx
  2231 00005212 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
  2232                              <1> 				     ; (allocation bit position)	 
  2233 00005215 3B05[0A5F0100]      <1> 	cmp 	eax, [swpd_next]     ; is the new free block addr. lower
  2234                              <1> 				     ; than the address in 'swpd_next' ?
  2235                              <1> 				     ; (next/first free block value)		
  2236 0000521B 7305                <1> 	jnb	short uswpbl_1	     ; no	
  2237 0000521D A3[0A5F0100]        <1> 	mov	[swpd_next], eax     ; yes	
  2238                              <1> uswpbl_1:
  2239 00005222 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate block
  2240                              <1> 				     ; set relevant bit to 1.
  2241                              <1> 				     ; set CF to the previous bit value	
  2242 00005225 F5                  <1> 	cmc			     ; complement carry flag	
  2243 00005226 7206                <1> 	jc	short uswpbl_2	     ; do not increase swfd_free count
  2244                              <1> 				     ; if the block is already deallocated
  2245                              <1> 				     ; before.	
  2246 00005228 FF05[065F0100]      <1>         inc     dword [swpd_free]
  2247                              <1> uswpbl_2:
  2248 0000522E 5A                  <1> 	pop	edx
  2249 0000522F 5B                  <1> 	pop	ebx
  2250 00005230 C3                  <1> 	retn
  2251                              <1> 
  2252                              <1> link_swap_block:
  2253                              <1> 	; 01/07/2015
  2254                              <1> 	; 18/04/2015
  2255                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2256                              <1> 	;
  2257                              <1> 	; INPUT -> none
  2258                              <1> 	;
  2259                              <1> 	; OUTPUT ->
  2260                              <1> 	;	EAX = OFFSET ADDRESS OF THE ALLOCATED BLOCK (4096 bytes)
  2261                              <1> 	;	      in sectors (corresponding 
  2262                              <1> 	;	      SWAP DISK ALLOCATION TABLE bit is RESET)
  2263                              <1> 	;
  2264                              <1> 	;	CF = 1 and EAX = 0 
  2265                              <1> 	; 		   if there is not a free block to be allocated	
  2266                              <1> 	;
  2267                              <1> 	; Modified Registers -> none (except EAX)
  2268                              <1> 	;
  2269                              <1> 
  2270                              <1> 	;mov	eax, [swpd_free]
  2271                              <1> 	;and	eax, eax
  2272                              <1> 	;jz	short out_of_swpspc
  2273                              <1> 	;
  2274 00005231 53                  <1> 	push	ebx
  2275 00005232 51                  <1> 	push	ecx
  2276                              <1> 	;
  2277 00005233 BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table offset
  2278 00005238 89D9                <1> 	mov	ecx, ebx
  2279 0000523A 031D[0A5F0100]      <1> 	add	ebx, [swpd_next] ; Free block searching starts from here
  2280                              <1> 				 ; next_free_swap_block >> 5
  2281 00005240 030D[0E5F0100]      <1> 	add	ecx, [swpd_last] ; Free block searching ends here
  2282                              <1> 				 ; (total_swap_blocks - 1) >> 5
  2283                              <1> lswbl_scan:
  2284 00005246 39CB                <1> 	cmp	ebx, ecx
  2285 00005248 770A                <1> 	ja	short lswbl_notfound
  2286                              <1> 	;
  2287 0000524A 0FBC03              <1> 	bsf	eax, [ebx] ; Scans source operand for first bit set (1).
  2288                              <1> 			   ; Clears ZF if a bit is found set (1) and 
  2289                              <1> 			   ; loads the destination with an index to
  2290                              <1> 			   ; first set bit. (0 -> 31) 
  2291                              <1> 			   ; Sets ZF to 1 if no bits are found set.
  2292                              <1> 	; 01/07/2015
  2293 0000524D 751C                <1> 	jnz	short lswbl_found ; ZF = 0 -> a free block has been found
  2294                              <1> 			 ;
  2295                              <1> 			 ; NOTE:  a Swap Disk Allocation Table bit 
  2296                              <1> 			 ;	  with value of 1 means 
  2297                              <1> 			 ;	  the corresponding page is free 
  2298                              <1> 			 ;	  (Retro UNIX 386 v1 feaure only!)
  2299 0000524F 83C304              <1> 	add	ebx, 4
  2300                              <1> 			 ; We return back for searching next page block
  2301                              <1> 			 ; NOTE: [swpd_free] is not ZERO; so, 
  2302                              <1> 			 ;	 we always will find at least 1 free block here.
  2303 00005252 EBF2                <1> 	jmp    	short lswbl_scan
  2304                              <1> 	;
  2305                              <1> lswbl_notfound:	
  2306 00005254 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2307 0000525A 890D[0A5F0100]      <1> 	mov	[swpd_next], ecx ; next/first free page = last page 
  2308                              <1> 				 ; (unlink_swap_block procedure will change it)
  2309 00005260 31C0                <1> 	xor	eax, eax
  2310 00005262 A3[065F0100]        <1> 	mov	[swpd_free], eax
  2311 00005267 F9                  <1> 	stc
  2312                              <1> lswbl_ok:
  2313 00005268 59                  <1> 	pop	ecx
  2314 00005269 5B                  <1> 	pop	ebx
  2315 0000526A C3                  <1> 	retn
  2316                              <1> 	;
  2317                              <1> ;out_of_swpspc:
  2318                              <1> ;	stc
  2319                              <1> ;	retn
  2320                              <1> 
  2321                              <1> lswbl_found:
  2322 0000526B 89D9                <1> 	mov	ecx, ebx
  2323 0000526D 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2324 00005273 890D[0A5F0100]      <1> 	mov	[swpd_next], ecx ; Set first free block searching start
  2325                              <1> 				 ; address/offset (to the next)
  2326 00005279 FF0D[065F0100]      <1>         dec     dword [swpd_free] ; 1 block has been allocated (X = X-1) 
  2327                              <1> 	;
  2328 0000527F 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2329                              <1> 				 ; is copied into the Carry Flag and then cleared
  2330                              <1> 				 ; in the destination.
  2331                              <1> 				 ;
  2332                              <1> 				 ; Reset the bit which is corresponding to the 
  2333                              <1> 				 ; (just) allocated block.
  2334 00005282 C1E105              <1> 	shl	ecx, 5		 ; (block offset * 32) + block index
  2335 00005285 01C8                <1> 	add	eax, ecx	 ; = block number
  2336 00005287 C1E003              <1> 	shl	eax, SECTOR_SHIFT ; 3, sector (offset) address of the block
  2337                              <1> 				 ; 1 block =  8 sectors
  2338                              <1> 	;
  2339                              <1> 	; EAX = offset address of swap disk/file sector (beginning of the block)
  2340                              <1> 	;
  2341                              <1> 	; NOTE: The relevant page table entry will be updated
  2342                              <1> 	;       according to this EAX value...
  2343                              <1> 	;
  2344 0000528A EBDC                <1> 	jmp	short lswbl_ok
  2345                              <1> 
  2346                              <1> logical_disk_read:
  2347                              <1> 	; 20/07/2015
  2348                              <1> 	; 09/03/2015 (temporary code here)
  2349                              <1> 	;
  2350                              <1> 	; INPUT ->
  2351                              <1> 	; 	ESI = Logical disk description table address
  2352                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2353                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2354                              <1> 	; 	ECX = Sector count
  2355                              <1> 	;
  2356                              <1> 	;
  2357 0000528C C3                  <1> 	retn
  2358                              <1> 
  2359                              <1> logical_disk_write:
  2360                              <1> 	; 20/07/2015
  2361                              <1> 	; 09/03/2015 (temporary code here)
  2362                              <1> 	;
  2363                              <1> 	; INPUT ->
  2364                              <1> 	; 	ESI = Logical disk description table address
  2365                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2366                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2367                              <1> 	; 	ECX = Sector count
  2368                              <1> 	;
  2369 0000528D C3                  <1> 	retn
  2370                              <1> 
  2371                              <1> get_physical_addr:
  2372                              <1> 	; 26/03/2017
  2373                              <1> 	; 20/02/2017
  2374                              <1> 	; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  2375                              <1> 	; 18/10/2015
  2376                              <1> 	; 29/07/2015
  2377                              <1> 	; 20/07/2015
  2378                              <1> 	; 04/06/2015
  2379                              <1> 	; 20/05/2015
  2380                              <1> 	; 28/04/2015
  2381                              <1> 	; 18/04/2015
  2382                              <1> 	; Get physical address
  2383                              <1> 	;     (allocates a new page for user if it is not present)
  2384                              <1> 	;	
  2385                              <1> 	; (This subroutine is needed for mapping user's virtual 
  2386                              <1> 	; (buffer) address to physical address (of the buffer).)
  2387                              <1> 	; ('sys write', 'sys read' system calls...)
  2388                              <1> 	;
  2389                              <1> 	; INPUT ->
  2390                              <1> 	;	EBX = virtual address
  2391                              <1> 	;	u.pgdir = page directory (physical) address
  2392                              <1> 	;
  2393                              <1> 	; OUTPUT ->
  2394                              <1> 	;	EAX = physical address 
  2395                              <1> 	;	EBX = linear address	
  2396                              <1> 	;	EDX = physical address of the page frame
  2397                              <1> 	;	      (with attribute bits)
  2398                              <1> 	;	ECX = byte count within the page frame
  2399                              <1> 	;
  2400                              <1> 	; Modified Registers -> EAX, EBX, ECX, EDX
  2401                              <1> 	;
  2402 0000528E 81C300004000        <1> 	add	ebx, CORE ; 18/10/2015
  2403                              <1> get_physical_addr_x: ; 27/05/2016
  2404 00005294 A1[545D0100]        <1> 	mov	eax, [u.pgdir]
  2405 00005299 E8F6F9FFFF          <1> 	call	get_pte
  2406                              <1> 		; EDX = Page table entry address (if CF=0)
  2407                              <1> 	        ;       Page directory entry address (if CF=1)
  2408                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  2409                              <1> 		; EAX = Page table entry value (page address)
  2410                              <1> 		;	CF = 1 -> PDE not present or invalid ? 
  2411 0000529E 731C                <1> 	jnc	short gpa_1
  2412                              <1> 	;
  2413 000052A0 E8D4F8FFFF          <1> 	call	allocate_page
  2414 000052A5 7248                <1> 	jc	short gpa_im_err  ; 'insufficient memory' error
  2415                              <1> gpa_0:
  2416 000052A7 E847F9FFFF          <1> 	call 	clear_page
  2417                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  2418 000052AC 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  2419                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  2420                              <1> 			   ; (user, writable, present page)	
  2421 000052AE 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  2422 000052B0 A1[545D0100]        <1> 	mov	eax, [u.pgdir]	
  2423 000052B5 E8DAF9FFFF          <1> 	call	get_pte
  2424 000052BA 7233                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2425                              <1> gpa_1:
  2426                              <1> 	; EAX = PTE value, EDX = PTE address
  2427 000052BC A801                <1> 	test 	al, PTE_A_PRESENT
  2428 000052BE 751F                <1> 	jnz	short gpa_3 ; 26/03/2017
  2429 000052C0 09C0                <1> 	or	eax, eax
  2430 000052C2 7456                <1> 	jz	short gpa_7  ; Allocate a new page
  2431                              <1> 	; 20/07/2015
  2432 000052C4 55                  <1> 	push	ebp
  2433 000052C5 89DD                <1> 	mov	ebp, ebx ; virtual (linear) address
  2434                              <1> 	; reload swapped page
  2435 000052C7 E878000000          <1> 	call	reload_page ; 28/04/2015
  2436 000052CC 5D                  <1> 	pop	ebp
  2437 000052CD 724A                <1> 	jc	short gpa_retn
  2438                              <1> gpa_2:
  2439                              <1> 	; 26/03/2017
  2440                              <1> 	; 20/02/2017
  2441                              <1> 	; If a page will contain a Signal Response Byte
  2442                              <1> 	; it must not be swapped out, because
  2443                              <1> 	; timer service or irq callback service
  2444                              <1> 	; will write a signal return/response byte 
  2445                              <1> 	; directly by using physical address of Signal
  2446                              <1> 	; Response Byte.(Even if process is not running,
  2447                              <1> 	; or it is running with swapped out pages.)
  2448                              <1> 	;
  2449                              <1> 	; 'no_page_swap' will be set by 'systimer' or
  2450                              <1> 	; 'syscalbac' sistem functions/calls. (*)
  2451                              <1> 	;
  2452 000052CF 803D[B6540100]00    <1> 	cmp	byte [no_page_swap], 0
  2453 000052D6 761D                <1> 	jna	short gpa_4 ; this page can be swapped out
  2454                              <1> 	; this page must not be swapped out
  2455                              <1> 	; but 'no_page_swap' must be reset here
  2456                              <1> 	; imediately for other callers (*)
  2457                              <1> 	; (otherwise, swap queue would not be long enough) 
  2458 000052D8 E84B000000          <1> 	call	gpa_8 ; 26/03/2017
  2459 000052DD EB1D                <1> 	jmp	short gpa_5
  2460                              <1> gpa_3: 
  2461                              <1> 	; 26/03/2017
  2462 000052DF 803D[B6540100]00    <1> 	cmp	byte [no_page_swap], 0
  2463 000052E6 7618                <1> 	jna	short gpa_6 ; this page can be swapped out
  2464 000052E8 E83B000000          <1> 	call	gpa_8
  2465 000052ED EB11                <1> 	jmp	short gpa_6
  2466                              <1> 
  2467                              <1> gpa_im_err:	
  2468 000052EF B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2469                              <1> 				  ; Major error = 0 (No protection fault)	
  2470 000052F4 C3                  <1> 	retn
  2471                              <1> gpa_4:
  2472                              <1> 	; 20/07/2015
  2473                              <1> 	; 20/05/2015
  2474                              <1> 	; add this page to swap queue
  2475 000052F5 50                  <1> 	push	eax 
  2476                              <1> 	; EBX = Linear (CORE+virtual) address ; 20/02/2017 
  2477 000052F6 E8BDFEFFFF          <1> 	call 	add_to_swap_queue
  2478 000052FB 58                  <1> 	pop	eax
  2479                              <1> gpa_5:
  2480                              <1> 		; PTE address in EDX
  2481                              <1> 		; virtual address in EBX
  2482                              <1> 	; EAX = memory page address
  2483 000052FC 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_USER + PTE_A_WRITE
  2484                              <1> 				  ; present flag, bit 0 = 1
  2485                              <1> 				  ; user flag, bit 2 = 1	
  2486                              <1> 				  ; writable flag, bit 1 = 1
  2487 000052FE 8902                <1> 	mov	[edx], eax  ; Update PTE value
  2488                              <1> gpa_6:
  2489                              <1> 	; 18/10/2015
  2490 00005300 89D9                <1> 	mov	ecx, ebx
  2491 00005302 81E1FF0F0000        <1> 	and	ecx, PAGE_OFF
  2492 00005308 89C2                <1> 	mov 	edx, eax
  2493 0000530A 662500F0            <1> 	and	ax, PTE_A_CLEAR
  2494 0000530E 01C8                <1> 	add	eax, ecx
  2495 00005310 F7D9                <1> 	neg	ecx ; 1 -> -1 (0FFFFFFFFh), 4095 (0FFFh) -> -4095
  2496 00005312 81C100100000        <1> 	add	ecx, PAGE_SIZE
  2497 00005318 F8                  <1> 	clc
  2498                              <1> gpa_retn:
  2499 00005319 C3                  <1> 	retn
  2500                              <1> gpa_7:	
  2501 0000531A E85AF8FFFF          <1> 	call	allocate_page
  2502 0000531F 72CE                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2503 00005321 E8CDF8FFFF          <1> 	call	clear_page
  2504 00005326 EBA7                <1> 	jmp	short gpa_2
  2505                              <1> 
  2506                              <1> gpa_8: ; 26/03/2017
  2507 00005328 C605[B6540100]00    <1> 	mov	byte [no_page_swap], 0
  2508 0000532F 53                  <1> 	push	ebx
  2509 00005330 50                  <1> 	push	eax ; 26/03/2017
  2510 00005331 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2511 00005336 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno] ; current process number
  2512 0000533C E89DFDFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2513                              <1> 				 ; it is already on the queue
  2514 00005341 58                  <1> 	pop	eax ; 26/03/2017
  2515 00005342 5B                  <1> 	pop	ebx
  2516 00005343 C3                  <1> 	retn
  2517                              <1> 
  2518                              <1> reload_page:
  2519                              <1> 	; 20/07/2015
  2520                              <1> 	; 28/04/2015 (Retro UNIX 386 v1 - beginning)
  2521                              <1> 	;
  2522                              <1> 	; Reload (Restore) swapped page at memory
  2523                              <1> 	;
  2524                              <1> 	; INPUT -> 
  2525                              <1> 	;	EBP = Virtual (linear) memory address
  2526                              <1> 	;	EAX = PTE value (swap disk sector address)
  2527                              <1> 	;	(Swap disk sector address = bit 1 to bit 31 of EAX)	
  2528                              <1> 	; OUTPUT ->
  2529                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF RELOADED PAGE
  2530                              <1> 	;
  2531                              <1> 	;	CF = 1 and EAX = error code
  2532                              <1> 	;
  2533                              <1> 	; Modified Registers -> none (except EAX)
  2534                              <1> 	;
  2535 00005344 D1E8                <1> 	shr	eax, 1   ; Convert PTE value to swap disk address 
  2536 00005346 53                  <1> 	push	ebx      ;
  2537 00005347 89C3                <1> 	mov	ebx, eax ; Swap disk (offset) address	
  2538 00005349 E82BF8FFFF          <1> 	call	allocate_page
  2539 0000534E 720C                <1> 	jc	short rlp_im_err
  2540 00005350 93                  <1> 	xchg 	eax, ebx	
  2541                              <1> 	; EBX = Physical memory (page) address
  2542                              <1> 	; EAX = Swap disk (offset) address
  2543                              <1> 	; EBP = Virtual (linear) memory address
  2544 00005351 E862FCFFFF          <1> 	call	swap_in
  2545 00005356 720B                <1> 	jc	short rlp_swp_err  ; (swap disk/file read error)
  2546 00005358 89D8                <1> 	mov	eax, ebx	
  2547                              <1> rlp_retn:
  2548 0000535A 5B                  <1> 	pop	ebx
  2549 0000535B C3                  <1> 	retn
  2550                              <1> 	
  2551                              <1> rlp_im_err:	
  2552 0000535C B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2553                              <1> 				  ; Major error = 0 (No protection fault)	
  2554 00005361 EBF7                <1> 	jmp	short rlp_retn
  2555                              <1> 
  2556                              <1> rlp_swp_err:
  2557 00005363 B828000000          <1> 	mov 	eax, SWP_DISK_READ_ERR ; Swap disk read error !
  2558 00005368 EBF0                <1> 	jmp	short rlp_retn
  2559                              <1> 
  2560                              <1> 
  2561                              <1> copy_page_dir:
  2562                              <1> 	; 19/09/2015
  2563                              <1> 	; temporary - 07/09/2015
  2564                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2565                              <1> 	;
  2566                              <1> 	; INPUT -> 
  2567                              <1> 	;	[u.pgdir] = PHYSICAL (real/flat) ADDRESS of the parent's
  2568                              <1> 	;		    page directory.
  2569                              <1> 	; OUTPUT ->
  2570                              <1> 	;	EAX =  PHYSICAL (real/flat) ADDRESS of the child's
  2571                              <1> 	;	       page directory.
  2572                              <1> 	;	(New page directory with new page table entries.)
  2573                              <1> 	;	(New page tables with read only copies of the parent's
  2574                              <1> 	;	pages.)
  2575                              <1> 	;	EAX = 0 -> Error (CF = 1)
  2576                              <1> 	;
  2577                              <1> 	; Modified Registers -> none (except EAX)
  2578                              <1> 	;
  2579 0000536A E80AF8FFFF          <1> 	call	allocate_page
  2580 0000536F 723E                <1> 	jc	short cpd_err
  2581                              <1> 	;
  2582 00005371 55                  <1> 	push	ebp ; 20/07/2015
  2583 00005372 56                  <1> 	push	esi
  2584 00005373 57                  <1> 	push	edi
  2585 00005374 53                  <1> 	push	ebx
  2586 00005375 51                  <1> 	push	ecx
  2587 00005376 8B35[545D0100]      <1> 	mov	esi, [u.pgdir]
  2588 0000537C 89C7                <1> 	mov	edi, eax
  2589 0000537E 50                  <1> 	push	eax ; save child's page directory address
  2590                              <1> 	; copy PDE 0 from the parent's page dir to the child's page dir
  2591                              <1> 	; (use same system space for all user page tables) 
  2592 0000537F A5                  <1> 	movsd
  2593 00005380 BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  2594 00005385 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  2595                              <1> cpd_0:	
  2596 0000538A AD                  <1> 	lodsd
  2597                              <1> 	;or	eax, eax
  2598                              <1>         ;jnz     short cpd_1
  2599 0000538B A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  2600 0000538D 7508                <1> 	jnz	short cpd_1
  2601                              <1>  	; (virtual address at the end of the page table)	
  2602 0000538F 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  2603 00005395 EB0F                <1> 	jmp	short cpd_2
  2604                              <1> cpd_1:	
  2605 00005397 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  2606 0000539B 89C3                <1> 	mov	ebx, eax
  2607                              <1> 	; EBX = Parent's page table address
  2608 0000539D E81F000000          <1> 	call	copy_page_table
  2609 000053A2 720C                <1> 	jc	short cpd_p_err
  2610                              <1> 	; EAX = Child's page table address
  2611 000053A4 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  2612                              <1> 			 ; set bit 0, bit 1 and bit 2 to 1
  2613                              <1> 			 ; (present, writable, user)
  2614                              <1> cpd_2:
  2615 000053A6 AB                  <1> 	stosd
  2616 000053A7 E2E1                <1> 	loop	cpd_0
  2617                              <1> 	;
  2618 000053A9 58                  <1> 	pop	eax  ; restore child's page directory address
  2619                              <1> cpd_3:
  2620 000053AA 59                  <1> 	pop	ecx
  2621 000053AB 5B                  <1> 	pop	ebx
  2622 000053AC 5F                  <1> 	pop	edi
  2623 000053AD 5E                  <1> 	pop	esi
  2624 000053AE 5D                  <1> 	pop	ebp
  2625                              <1> cpd_err:
  2626 000053AF C3                  <1> 	retn
  2627                              <1> cpd_p_err:
  2628                              <1> 	; release the allocated pages missing (recover free space)
  2629 000053B0 58                  <1> 	pop	eax  ; the new page directory address (physical)
  2630 000053B1 8B1D[545D0100]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  2631 000053B7 E8F6F8FFFF          <1> 	call 	deallocate_page_dir
  2632 000053BC 29C0                <1> 	sub	eax, eax ; 0
  2633 000053BE F9                  <1> 	stc
  2634 000053BF EBE9                <1> 	jmp	short cpd_3	
  2635                              <1> 
  2636                              <1> copy_page_table:
  2637                              <1> 	; 19/09/2015
  2638                              <1> 	; temporary - 07/09/2015
  2639                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2640                              <1> 	;
  2641                              <1> 	; INPUT -> 
  2642                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS of the parent's page table.
  2643                              <1> 	;	EBP = page table entry index (from 'copy_page_dir')
  2644                              <1> 	; OUTPUT ->
  2645                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS of the child's page table.
  2646                              <1> 	;	EBP = (recent) page table index (for 'add_to_swap_queue')	
  2647                              <1> 	;	CF = 1 -> error 
  2648                              <1> 	;
  2649                              <1> 	; Modified Registers -> EBP (except EAX)
  2650                              <1> 	;
  2651 000053C1 E8B3F7FFFF          <1> 	call	allocate_page
  2652 000053C6 725A                <1> 	jc	short cpt_err
  2653                              <1> 	;
  2654 000053C8 50                  <1> 	push	eax ; *
  2655                              <1> 	;push 	ebx
  2656 000053C9 56                  <1> 	push	esi
  2657 000053CA 57                  <1> 	push	edi
  2658 000053CB 52                  <1> 	push	edx
  2659 000053CC 51                  <1> 	push	ecx
  2660                              <1> 	;
  2661 000053CD 89DE                <1> 	mov	esi, ebx
  2662 000053CF 89C7                <1> 	mov	edi, eax
  2663 000053D1 89C2                <1> 	mov	edx, eax
  2664 000053D3 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  2665                              <1> cpt_0:
  2666 000053D9 AD                  <1> 	lodsd
  2667 000053DA A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  2668 000053DC 750B                <1> 	jnz	short cpt_1
  2669 000053DE 21C0                <1> 	and	eax, eax
  2670 000053E0 7430                <1> 	jz	short cpt_2
  2671                              <1> 	; ebp = virtual (linear) address of the memory page
  2672 000053E2 E85DFFFFFF          <1> 	call	reload_page ; 28/04/2015
  2673 000053E7 7234                <1> 	jc	short cpt_p_err
  2674                              <1> cpt_1:
  2675 000053E9 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  2676 000053ED 89C1                <1> 	mov	ecx, eax
  2677                              <1> 	; Allocate a new page for the child process
  2678 000053EF E885F7FFFF          <1> 	call	allocate_page
  2679 000053F4 7227                <1> 	jc	short cpt_p_err
  2680 000053F6 57                  <1> 	push	edi
  2681 000053F7 56                  <1> 	push	esi
  2682 000053F8 89CE                <1> 	mov	esi, ecx
  2683 000053FA 89C7                <1> 	mov	edi, eax
  2684 000053FC B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  2685 00005401 F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  2686 00005403 5E                  <1> 	pop	esi
  2687 00005404 5F                  <1> 	pop	edi
  2688                              <1> 	; 
  2689 00005405 53                  <1> 	push	ebx
  2690 00005406 50                  <1> 	push	eax
  2691 00005407 89EB                <1> 	mov	ebx, ebp
  2692                              <1> 	; ebx = virtual address of the memory page
  2693 00005409 E8AAFDFFFF          <1> 	call	add_to_swap_queue
  2694 0000540E 58                  <1> 	pop	eax
  2695 0000540F 5B                  <1> 	pop	ebx
  2696                              <1> 	;
  2697                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  2698 00005410 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  2699                              <1> cpt_2:
  2700 00005412 AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  2701                              <1> 	;
  2702 00005413 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  2703                              <1> 	;
  2704 00005419 39D7                <1> 	cmp	edi, edx
  2705 0000541B 72BC                <1> 	jb	short cpt_0
  2706                              <1> cpt_p_err:
  2707 0000541D 59                  <1> 	pop	ecx
  2708 0000541E 5A                  <1> 	pop	edx
  2709 0000541F 5F                  <1> 	pop	edi
  2710 00005420 5E                  <1> 	pop	esi
  2711                              <1> 	;pop	ebx
  2712 00005421 58                  <1> 	pop	eax ; *
  2713                              <1> cpt_err:
  2714 00005422 C3                  <1> 	retn
  2715                              <1> 
  2716                              <1> 
  2717                              <1> allocate_memory_block:
  2718                              <1> 	; 03/04/2016
  2719                              <1> 	; 02/04/2016
  2720                              <1> 	; 01/04/2016
  2721                              <1> 	; 14/03/2016
  2722                              <1> 	; 13/03/2016
  2723                              <1> 	; 12/03/2016 (TRDOS 386 = TRDOS v2.0)
  2724                              <1> 	; Allocating contiguous memory pages (in the kernel's memory space)
  2725                              <1> 	;
  2726                              <1> 	; INPUT -> 
  2727                              <1> 	;	EAX = Beginning address (physical)
  2728                              <1> 	;	EAX = 0 -> Allocate memory block from the first proper aperture	
  2729                              <1> 	;	ECX = Number of bytes to be allocated
  2730                              <1> 	;
  2731                              <1> 	; OUTPUT ->
  2732                              <1> 	; 	1) cf = 0 -> successful
  2733                              <1> 	;	EAX = Beginning (physical) address of the allocated memory block
  2734                              <1> 	;	ECX = Number of allocated bytes (rounded up to page borders) 
  2735                              <1> 	;	2) cf = 1 -> unsuccessful
  2736                              <1> 	;	 2.1) If EAX > 0 -> 
  2737                              <1> 	;	      (Number of requested pages is more than # of free pages
  2738                              <1> 	;	       but contiguous free pages -the aperture- is not enough!)	   	
  2739                              <1> 	;	      EAX = Beginning address of available aperture
  2740                              <1> 	;		    (one of all aperture with max. aperture size/length)		
  2741                              <1> 	;	      ECX = Size of available aperture (memory block) in bytes
  2742                              <1> 	;	 2.2) If EAX = 0 -> Out of memory error 
  2743                              <1> 	;	            (number of free pages is less than requested number)
  2744                              <1> 	;	      ECX = Total number of free bytes (free pages * 4096) 
  2745                              <1> 	;		    (It is not number of contiguous free bytes)	
  2746                              <1> 	;
  2747                              <1> 	; (Modified Registers -> EAX, ECX)
  2748                              <1> 	;
  2749                              <1> 	; PURPOSE: Loading a file at memory for copying or running etc.
  2750                              <1> 	; If this procedure returns with cf is set, ECX contains maximum
  2751                              <1> 	; available space and EAX contains the beginning address of it.
  2752                              <1> 	; If EAX has zero, ECX contains total number of free bytes.
  2753                              <1> 	; If requested block has been successfully allocated (by rounding up to
  2754                              <1> 	; the last page border), it must be deallocated later by using
  2755                              <1> 	; 'dealloacate_memory_block' procedure.    
  2756                              <1> 
  2757 00005423 52                  <1> 	push	edx ; *
  2758 00005424 BAFF0F0000          <1> 	mov	edx, PAGE_SIZE - 1   ; 4095
  2759 00005429 01D1                <1> 	add	ecx, edx
  2760 0000542B 01D0                <1> 	add	eax, edx
  2761 0000542D C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  2762                              <1> 
  2763                              <1> 	; ECX = number of contiguous pages to be allocated
  2764 00005430 8B15[E8410100]      <1> 	mov	edx, [free_pages]
  2765 00005436 39D1                <1> 	cmp	ecx, edx
  2766 00005438 7775                <1> 	ja	short amb_6
  2767                              <1> 
  2768 0000543A C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; 12
  2769                              <1> 
  2770 0000543D 89C2                <1> 	mov	edx, eax 	     ; page number
  2771 0000543F C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2772                              <1> 				     ; (1 allocation bit = 1 page)
  2773                              <1> 				     ; (1 allocation bytes = 8 pages)
  2774 00005442 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2775                              <1> 				     ; (to get 32 bit position)	
  2776 00005445 53                  <1> 	push	ebx ; **
  2777                              <1> amb_0:
  2778 00005446 890D[A04E0100]      <1> 	mov	[mem_ipg_count], ecx ; initial (reset) value of page count
  2779 0000544C 890D[A44E0100]      <1> 	mov	[mem_pg_count], ecx
  2780 00005452 31C9                <1> 	xor	ecx, ecx ; 0
  2781 00005454 890D[A84E0100]      <1> 	mov	[mem_aperture], ecx ; 0
  2782 0000545A 890D[AC4E0100]      <1> 	mov	[mem_max_aperture], ecx ; 0
  2783                              <1> 	
  2784 00005460 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address.
  2785 00005465 3B15[EC410100]      <1> 	cmp	edx, [next_page]     ; Is the beginning page address lower
  2786                              <1> 				     ; than the address in 'next_page' ?
  2787                              <1> 				     ; (the first/next free page of user space)		
  2788 0000546B 7208                <1> 	jb	short amb_1
  2789 0000546D 3B15[F0410100]      <1> 	cmp 	edx, [last_page]     ; is the beginning page address higher
  2790                              <1> 				     ; than the address in 'last_page' ?
  2791                              <1> 				     ; (end of the memory)		
  2792 00005473 7606                <1> 	jna	short amb_2	     ; no	
  2793                              <1> amb_1:
  2794 00005475 8B15[EC410100]      <1> 	mov	edx, [next_page]     ; yes (reset to the first page of user space)
  2795                              <1> amb_2:
  2796 0000547B 01D3                <1> 	add	ebx, edx
  2797                              <1> 
  2798 0000547D A3[B04E0100]        <1> 	mov	[mem_pg_pos], eax    ; beginning page no (for curr. mem. aperture)
  2799 00005482 A3[B44E0100]        <1>  	mov	[mem_max_pg_pos], eax ; beginning page no for max. mem. aperture
  2800                              <1> 
  2801 00005487 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only (0 to 31)
  2802                              <1> 				     ; (allocation bit position)	 
  2803 0000548A 744B                <1> 	jz	short amb_10	     ; 0	
  2804                              <1> amb_3:
  2805 0000548C 8B13                <1> 	mov	edx, [ebx]
  2806 0000548E 88C1                <1> 	mov	cl, al ; 1 to 31
  2807 00005490 D3EA                <1> 	shr	edx, cl
  2808 00005492 89D0                <1> 	mov	eax, edx
  2809                              <1> amb_4:
  2810 00005494 D1E8                <1> 	shr	eax, 1 ; (***)
  2811 00005496 7321                <1> 	jnc	short amb_7
  2812 00005498 FF05[A84E0100]      <1> 	inc	dword [mem_aperture]
  2813 0000549E FF0D[A44E0100]      <1> 	dec	dword [mem_pg_count]
  2814 000054A4 747B                <1> 	jz	short amb_15
  2815                              <1> amb_5:
  2816 000054A6 80F91F              <1> 	cmp	cl, 31
  2817 000054A9 7317                <1> 	jnb	short amb_8
  2818 000054AB FEC1                <1> 	inc	cl
  2819 000054AD EBE5                <1> 	jmp	short amb_4
  2820                              <1> 
  2821                              <1> amb_6:	; out_of_memory
  2822 000054AF 31C0                <1> 	xor	eax, eax ; 0
  2823 000054B1 89D1                <1> 	mov	ecx, edx ; free pages
  2824 000054B3 C1E10C              <1> 	shl	ecx, PAGE_SHIFT
  2825 000054B6 5A                  <1> 	pop	edx ; *
  2826 000054B7 F9                  <1> 	stc
  2827 000054B8 C3                  <1> 	retn
  2828                              <1> amb_7:
  2829 000054B9 50                  <1> 	push	eax ; (***) allocation bits (in shifted status)
  2830 000054BA E819010000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2831 000054BF 58                  <1> 	pop	eax ; (***)
  2832 000054C0 EBE4                <1> 	jmp	short amb_5
  2833                              <1> amb_8:
  2834 000054C2 28C9                <1> 	sub	cl, cl ; 0
  2835                              <1> amb_9:
  2836 000054C4 89DA                <1> 	mov	edx, ebx
  2837 000054C6 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL
  2838 000054CC 3B15[F0410100]      <1> 	cmp	edx, [last_page]
  2839 000054D2 7336                <1> 	jnb	short amb_14 ; contiguous pages not enough
  2840 000054D4 83C304              <1> 	add	ebx, 4
  2841                              <1> amb_10:
  2842 000054D7 8B03                <1> 	mov	eax, [ebx]
  2843 000054D9 21C0                <1> 	and 	eax, eax
  2844 000054DB 7406                <1>         jz      short amb_11 ; there is not a free page bit in this alloc dword
  2845 000054DD 40                  <1> 	inc	eax ; 0FFFFFFFFh -> 0
  2846 000054DE 740A                <1> 	jz	short amb_12 ; all of bits are set (32 free pages)
  2847 000054E0 48                  <1> 	dec	eax
  2848 000054E1 EBB1                <1> 	jmp	short amb_4
  2849                              <1> amb_11:
  2850 000054E3 E8F0000000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2851 000054E8 EBDA                <1> 	jmp	short amb_9	
  2852                              <1> amb_12:
  2853 000054EA B120                <1> 	mov	cl, 32
  2854 000054EC 390D[A44E0100]      <1> 	cmp	[mem_pg_count], ecx ; 32
  2855 000054F2 7306                <1> 	jnb	short amb_13
  2856 000054F4 8B0D[A44E0100]      <1> 	mov	ecx, [mem_pg_count]
  2857                              <1> amb_13:
  2858 000054FA 010D[A84E0100]      <1> 	add	[mem_aperture], ecx
  2859 00005500 290D[A44E0100]      <1> 	sub	[mem_pg_count], ecx
  2860 00005506 7619                <1> 	jna	short amb_15
  2861 00005508 EBB8                <1> 	jmp	short amb_8
  2862                              <1> amb_14:
  2863 0000550A A1[B44E0100]        <1> 	mov	eax, [mem_max_pg_pos] ; begin address of max. mem aperture	
  2864 0000550F 8B0D[AC4E0100]      <1> 	mov	ecx, [mem_max_aperture] ; max. (largest) memory aperture
  2865 00005515 C1E00C              <1> 	shl	eax, PAGE_SHIFT	     ; convert to phy. address in bytes
  2866 00005518 C1E10C              <1> 	shl	ecx, PAGE_SHIFT	     ; convert to byte counts
  2867 0000551B F9                  <1> 	stc
  2868 0000551C E9AC000000          <1>         jmp     amb_25
  2869                              <1> 
  2870                              <1> amb_15: ; OK !
  2871 00005521 A1[B04E0100]        <1> 	mov	eax, [mem_pg_pos]    ; Beginning address as page number
  2872 00005526 8B0D[A84E0100]      <1> 	mov	ecx, [mem_aperture]  ; Free contiguous page count
  2873                              <1> amb_16:
  2874                              <1> 	; allocate contiguous memory pages (via memory allocation table bits)
  2875 0000552C 89C2                <1> 	mov	edx, eax
  2876 0000552E C1EA05              <1> 	shr	edx, 5 ; 32 pages in one allocation dword (32 bits)
  2877 00005531 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2878 00005536 01D3                <1> 	add	ebx, edx
  2879 00005538 83E01F              <1> 	and	eax, 1Fh ; 31
  2880                              <1> 	; 03/04/2016
  2881 0000553B BA20000000          <1> 	mov	edx, 32
  2882 00005540 28C2                <1> 	sub	dl, al
  2883 00005542 39CA                <1> 	cmp	edx, ecx
  2884 00005544 7602                <1> 	jna	short amb_17
  2885 00005546 89CA                <1> 	mov	edx, ecx
  2886                              <1> amb_17:
  2887 00005548 29D1                <1> 	sub	ecx, edx
  2888 0000554A 51                  <1> 	push	ecx ; ***
  2889 0000554B 89D1                <1> 	mov	ecx, edx
  2890                              <1> amb_18:		
  2891 0000554D 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2892                              <1> 				 ; is copied into the Carry Flag and then cleared
  2893                              <1> 				 ; in the destination.
  2894 00005550 FF0D[E8410100]      <1> 	dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
  2895 00005556 49                  <1> 	dec	ecx
  2896 00005557 7404                <1> 	jz	short amb_19
  2897 00005559 FEC0                <1> 	inc	al
  2898 0000555B EBF0                <1> 	jmp	short amb_18
  2899                              <1> amb_19:	
  2900 0000555D 59                  <1> 	pop	ecx ; ***
  2901 0000555E 21C9                <1> 	and	ecx, ecx ; 0 ?
  2902 00005560 741E                <1> 	jz	short amb_22	
  2903                              <1> 	; 01/04/2016
  2904 00005562 B020                <1> 	mov	al, 32
  2905                              <1> amb_20:
  2906 00005564 83C304              <1> 	add	ebx, 4
  2907 00005567 39C1                <1> 	cmp	ecx, eax ; 32
  2908 00005569 7305                <1> 	jnb	short amb_21
  2909                              <1> 	; ECX < 32
  2910 0000556B 28C0                <1> 	sub	al, al ; 0
  2911 0000556D 50                  <1> 	push	eax ; 0 ***
  2912 0000556E EBDD                <1> 	jmp	short amb_18
  2913                              <1> amb_21:
  2914 00005570 2905[E8410100]      <1> 	sub	[free_pages], eax ; [free_pages] = [free_pages] - 32
  2915 00005576 C70300000000        <1> 	mov	dword [ebx], 0 ; reset 32 bits
  2916 0000557C 29C1                <1> 	sub	ecx, eax ; 32
  2917 0000557E 75E4                <1> 	jnz	short amb_20
  2918                              <1> amb_22:
  2919 00005580 A1[B04E0100]        <1> 	mov	eax, [mem_pg_pos]   ; Beginning address as page number
  2920 00005585 8B0D[A84E0100]      <1> 	mov	ecx, [mem_aperture] ; Free contiguous page count
  2921                              <1> 	; [next_page] update
  2922 0000558B 89C2                <1> 	mov	edx, eax
  2923                              <1> 	; 03/04/2016
  2924 0000558D C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2925                              <1> 				     ; (1 allocation bit = 1 page)
  2926                              <1> 				     ; (1 allocation bytes = 8 pages)
  2927 00005590 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2928                              <1> 				     ; (to get 32 bit position)	
  2929 00005593 3B15[EC410100]      <1> 	cmp	edx, [next_page] ; first free page pointer offset
  2930 00005599 7732                <1> 	ja	short amb_25
  2931 0000559B BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2932 000055A0 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2933 000055A4 7721                <1> 	ja	short amb_24
  2934 000055A6 89C2                <1> 	mov	edx, eax
  2935 000055A8 01CA                <1> 	add	edx, ecx
  2936 000055AA C1EA03              <1> 	shr	edx, 3
  2937 000055AD 80E2FC              <1> 	and	dl, 0FCh
  2938                              <1> amb_23:
  2939 000055B0 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2940 000055B4 7711                <1> 	ja	short amb_24
  2941 000055B6 83C204              <1> 	add	edx, 4
  2942 000055B9 3B15[F0410100]      <1> 	cmp	edx, [last_page]    ; last page pointer offset
  2943 000055BF 76EF                <1> 	jna	short amb_23
  2944 000055C1 8B15[F4410100]      <1> 	mov	edx, [first_page]   ; (for) beginning of user's space
  2945                              <1> amb_24:
  2946 000055C7 8915[EC410100]      <1> 	mov	[next_page], edx
  2947                              <1> amb_25:
  2948 000055CD 9C                  <1> 	pushf
  2949 000055CE C1E00C              <1> 	shl	eax, PAGE_SHIFT	     ; convert to phy. address in bytes
  2950 000055D1 C1E10C              <1> 	shl	ecx, PAGE_SHIFT	     ; convert to byte counts
  2951 000055D4 9D                  <1> 	popf
  2952 000055D5 5B                  <1> 	pop	ebx ; **
  2953 000055D6 5A                  <1> 	pop	edx ; *
  2954 000055D7 C3                  <1> 	retn
  2955                              <1> 
  2956                              <1> amb_26:	; set maximum free memory aperture (free memory block size) 
  2957 000055D8 89DA                <1> 	mov	edx, ebx ; current address
  2958 000055DA 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL ; MAT beginning address
  2959                              <1> 	; 02/04/2016 
  2960 000055E0 C1E203              <1> 	shl	edx, 3 ; MAT byte offset * 8 = page number base
  2961 000055E3 01CA                <1> 	add	edx, ecx ; current page number (ecx =  0 to 31)
  2962                              <1> 	;
  2963 000055E5 A1[A84E0100]        <1> 	mov	eax, [mem_aperture]
  2964 000055EA 21C0                <1> 	and	eax, eax
  2965 000055EC 7424                <1>         jz      short amb_27
  2966 000055EE C705[A84E0100]0000- <1>         mov     dword [mem_aperture], 0
  2966 000055F6 0000                <1>
  2967 000055F8 3B05[AC4E0100]      <1> 	cmp	eax, [mem_max_aperture]
  2968 000055FE 7612                <1> 	jna	short amb_27
  2969 00005600 A3[AC4E0100]        <1> 	mov	[mem_max_aperture], eax
  2970                              <1> 	;
  2971 00005605 89D0                <1> 	mov	eax, edx
  2972 00005607 2B05[AC4E0100]      <1> 	sub	eax, [mem_max_aperture] ; the last aperture size in pages
  2973                              <1> 	; EAX = Beginning page number of the max. aperture 
  2974 0000560D A3[B44E0100]        <1> 	mov	[mem_max_pg_pos], eax
  2975                              <1> amb_27: 
  2976 00005612 42                  <1> 	inc	edx	
  2977 00005613 8915[B04E0100]      <1> 	mov	[mem_pg_pos], edx ; next page
  2978                              <1> 
  2979 00005619 A1[A04E0100]        <1> 	mov	eax, [mem_ipg_count] ; initial (reset) value of page count
  2980 0000561E A3[A44E0100]        <1> 	mov	[mem_pg_count], eax
  2981                              <1> 
  2982 00005623 C3                  <1> 	retn
  2983                              <1> 
  2984                              <1> deallocate_memory_block:
  2985                              <1> 	; 03/04/2016
  2986                              <1> 	; 14/03/2016 (TRDOS 386 = TRDOS v2.0)
  2987                              <1> 	; Deallocating contiguous memory pages (in the kernel's memory space)
  2988                              <1> 	;
  2989                              <1> 	; INPUT -> 
  2990                              <1> 	;	EAX = Beginning address (physical)
  2991                              <1> 	;	ECX = Number of bytes to be deallocated
  2992                              <1> 	;
  2993                              <1> 	; OUTPUT ->
  2994                              <1> 	;	Memory Allocation Table bits will be updated
  2995                              <1> 	;	[free_pages] will be changed (increased)
  2996                              <1> 	;
  2997                              <1> 	; (Modified Registers -> EAX, ECX)
  2998                              <1> 	;
  2999                              <1> 	; PURPOSE: Unloading/Freeing a file -or an allocated memory block- 
  3000                              <1> 	; at memory after copying, running, saving, reading, writing etc.
  3001                              <1> 	;
  3002                              <1> 
  3003 00005624 52                  <1> 	push	edx ; *
  3004 00005625 53                  <1> 	push	ebx ; **
  3005                              <1> 
  3006 00005626 C1E80C              <1> 	shr	eax, PAGE_SHIFT	     ; 12
  3007 00005629 C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  3008                              <1> 
  3009                              <1> 	; EAX = Beginning page number
  3010                              <1> 	; ECX = Number of contiguous pages to be deallocated
  3011                              <1> damb_0:
  3012                              <1> 	; deallocate contiguous memory pages (via memory allocation table bits)
  3013 0000562C 89C2                <1> 	mov	edx, eax
  3014 0000562E C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  3015                              <1> 				     ; (1 allocation bit = 1 page)
  3016                              <1> 				     ; (1 allocation bytes = 8 pages)
  3017 00005631 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  3018                              <1> 				     ; (to get 32 bit position)	
  3019 00005634 3B15[EC410100]      <1> 	cmp	edx, [next_page] ; next free page
  3020 0000563A 7306                <1> 	jnb	short damb_1
  3021 0000563C 8915[EC410100]      <1> 	mov	[next_page], edx
  3022                              <1> damb_1:
  3023 00005642 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  3024 00005647 01D3                <1> 	add	ebx, edx
  3025 00005649 83E01F              <1> 	and	eax, 1Fh ; 31
  3026                              <1> 
  3027                              <1> 	; 03/04/2016
  3028 0000564C BA20000000          <1> 	mov	edx, 32
  3029 00005651 28C2                <1> 	sub	dl, al
  3030 00005653 39CA                <1> 	cmp	edx, ecx
  3031 00005655 7602                <1> 	jna	short damb_2
  3032 00005657 89CA                <1> 	mov	edx, ecx
  3033                              <1> damb_2:
  3034 00005659 29D1                <1> 	sub	ecx, edx
  3035 0000565B 51                  <1> 	push	ecx ; ***
  3036 0000565C 89D1                <1> 	mov	ecx, edx
  3037                              <1> damb_3:		
  3038 0000565E 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate page
  3039                              <1> 				     ; set relevant bit to 1.
  3040                              <1> 				     ; set CF to the previous bit value	
  3041 00005661 FF05[E8410100]      <1> 	inc     dword [free_pages]   ; 1 page has been deallocated (X = X+1) 
  3042 00005667 49                  <1> 	dec	ecx
  3043 00005668 7404                <1> 	jz	short damb_4
  3044 0000566A FEC0                <1> 	inc	al
  3045 0000566C EBF0                <1> 	jmp	short damb_3
  3046                              <1> damb_4:	
  3047 0000566E 59                  <1> 	pop	ecx ; ***
  3048 0000566F 21C9                <1> 	and	ecx, ecx ; 0 ?
  3049 00005671 741E                <1> 	jz	short damb_7
  3050                              <1> 	; 03/04/2016
  3051 00005673 B020                <1> 	mov	al, 32
  3052                              <1> damb_5:
  3053 00005675 83C304              <1> 	add	ebx, 4
  3054 00005678 39C1                <1> 	cmp	ecx, eax ; 32
  3055 0000567A 7305                <1> 	jnb	short damb_6
  3056                              <1> 	; ECX < 32
  3057 0000567C 28C0                <1> 	sub	al, al ; 0
  3058 0000567E 50                  <1> 	push	eax ; 0 ***
  3059 0000567F EBDD                <1> 	jmp	short damb_3
  3060                              <1> damb_6:
  3061 00005681 0105[E8410100]      <1> 	add	[free_pages], eax ; [free_pages] = [free_pages] + 32
  3062 00005687 C703FFFFFFFF        <1> 	mov	dword [ebx], 0FFFFFFFFh ; set 32 bits
  3063 0000568D 29C1                <1> 	sub	ecx, eax ; 32
  3064 0000568F 75E4                <1> 	jnz	short damb_5
  3065                              <1> damb_7:
  3066 00005691 5B                  <1> 	pop	ebx ; **
  3067 00005692 5A                  <1> 	pop	edx ; *
  3068 00005693 C3                  <1> 	retn
  3069                              <1> 
  3070                              <1> direct_memory_access:
  3071                              <1> 	; 16/07/2016
  3072                              <1> 	; 12/07/2016 (TRDOS 386 = TRDOS v2.0)
  3073                              <1> 	; This processure will be called to map
  3074                              <1> 	; user's (ring 3) page tables to access phsical
  3075                              <1> 	; (flat/linear) memory addresses, directly (without
  3076                              <1> 	;  kernel's data transfer functions).
  3077                              <1> 	; 
  3078                              <1> 	; Purpose: Video memory access and shared memory access.
  3079                              <1> 	;
  3080                              <1> 	; INPUT -> 
  3081                              <1> 	;	EAX = Beginning address (physical).
  3082                              <1> 	;	ECX = Number of contiguous pages to be mapped.
  3083                              <1> 	; OUTPUT ->
  3084                              <1> 	;	User's page directory and pages tables
  3085                              <1> 	;	will be updated.
  3086                              <1> 	;	
  3087                              <1> 	;	If an old page table entry has valid page address, 
  3088                              <1> 	;	that page will be deallocated just before PTE will
  3089                              <1> 	;	be changed for direct (1 to 1) memory page access.
  3090                              <1> 	;
  3091                              <1> 	;	If old PTE value points to a swapped page,
  3092                              <1>         ;       that page (block) will be unlinked on swap disk. 
  3093                              <1> 	;
  3094                              <1> 	;	Newly allocated pages (except page tables) will not
  3095                              <1> 	;	be applied to Memory Allocation Table.
  3096                              <1> 	;	AVL bit 1 (PTE bit 10) of page table entry will be
  3097                              <1> 	;	used to indicate shared (direct) memory page; then,
  3098                              <1> 	;	this page will not be deallocated later during
  3099                              <1> 	;	process termination. (Memory Allocation Table and
  3100                              <1> 	;	free memory count will not be affected.
  3101                              <1> 	;	(Except deallocating page table's itself.)
  3102                              <1> 	;	
  3103                              <1> 	;      CF = 1 -> error (EAX = error code)
  3104                              <1> 	;      CF = 0 -> success (EAX = beginning address)
  3105                              <1> 	;
  3106                              <1> 	;; (Modified Registers -> none)
  3107                              <1> 	; Modified registers: ebp, edx, ecx, ebx, esi, edi	
  3108                              <1> 	;
  3109                              <1> 
  3110                              <1> 	;push	ebp
  3111                              <1> 	;push	ebx
  3112                              <1> 	;push	ecx
  3113                              <1> 	;push	edx
  3114 00005694 662500F0            <1> 	and	ax, PTE_A_CLEAR ; clear page offset
  3115 00005698 50                  <1> 	push	eax
  3116 00005699 89C5                <1> 	mov	ebp, eax
  3117                              <1> dmem_acc_0: 
  3118 0000569B 89C3                <1> 	mov	ebx, eax
  3119 0000569D 81C300004000        <1> 	add	ebx, CORE
  3120 000056A3 A1[545D0100]        <1> 	mov	eax, [u.pgdir] ; page dir address (physical)
  3121 000056A8 E8E7F5FFFF          <1> 	call	get_pte
  3122                              <1> 		; EDX = Page table entry address (if CF=0)
  3123                              <1> 	        ;       Page directory entry address (if CF=1)
  3124                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  3125                              <1> 		; EAX = Page table entry value (page address)
  3126                              <1> 		;	CF = 1 -> PDE not present or invalid ? 	
  3127 000056AD 7324                <1> 	jnc	short dmem_acc_1
  3128                              <1> 	;
  3129 000056AF E8C5F4FFFF          <1> 	call	allocate_page
  3130 000056B4 0F82A1000000        <1>         jc      dmem_acc_7  ; 'insufficient memory' error
  3131                              <1> 	;
  3132 000056BA E834F5FFFF          <1> 	call 	clear_page
  3133                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  3134 000056BF 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  3135                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  3136                              <1> 			   ; (user, writable, present page)	
  3137 000056C1 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  3138 000056C3 A1[545D0100]        <1> 	mov	eax, [u.pgdir]	
  3139 000056C8 E8C7F5FFFF          <1> 	call	get_pte
  3140 000056CD 0F8288000000        <1>         jc      dmem_acc_7 ; 'insufficient memory' error
  3141                              <1> dmem_acc_1:
  3142                              <1> 	; EAX = PTE value, EDX = PTE address
  3143 000056D3 A801                <1> 	test 	al, PTE_A_PRESENT
  3144 000056D5 750D                <1> 	jnz	short dmem_acc_2
  3145 000056D7 09C0                <1> 	or	eax, eax
  3146 000056D9 7468                <1> 	jz	short dmem_acc_6   ; Change PTE
  3147 000056DB D1E8                <1> 	shr	eax, 1		; swap disk block (8 sectors) address
  3148                              <1> 	; unlink swap disk block
  3149 000056DD E81CFBFFFF          <1> 	call	unlink_swap_block
  3150 000056E2 EB5F                <1> 	jmp	short dmem_acc_6
  3151                              <1> 
  3152                              <1> dmem_acc_2:
  3153 000056E4 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3154                              <1> 				  ; (must be 1)
  3155 000056E6 7550                <1> 	jnz	short dmem_acc_4
  3156                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3157 000056E8 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3158                              <1> 				   ; as child's page ?
  3159 000056EC 7455                <1> 	jz	short dmem_acc_5 ; Change PTE but don't deallocate the page!
  3160                              <1> 
  3161                              <1> 	;push	edi
  3162                              <1> 	;push	esi
  3163                              <1> 
  3164 000056EE 51                  <1> 	push	ecx
  3165                              <1> 	;push	ebx
  3166 000056EF 8B1D[585D0100]      <1> 	mov	ebx, [u.ppgdir] ; parent's page dir address (physical)
  3167                              <1> 	
  3168                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3169 000056F5 89EF                <1> 	mov	edi, ebp
  3170 000056F7 C1EF16              <1> 	shr	edi, PAGE_D_SHIFT ; 22
  3171                              <1> 	; EDI = page directory entry index (0-1023)
  3172 000056FA 89EE                <1> 	mov	esi, ebp
  3173 000056FC C1EE0C              <1> 	shr	esi, PAGE_SHIFT ; 12	
  3174 000056FF 81E6FF030000        <1> 	and	esi, PTE_MASK
  3175                              <1> 	; ESI = page table entry index (0-1023)
  3176                              <1> 
  3177 00005705 66C1E702            <1> 	shl	di, 2 ; * 4
  3178 00005709 01FB                <1> 	add	ebx, edi ; PDE offset (for the parent)
  3179 0000570B 8B0F                <1> 	mov	ecx, [edi]
  3180 0000570D F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
  3181 00005710 7425                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3182 00005712 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3183 00005717 66C1E602            <1> 	shl	si, 2 ; *4 
  3184 0000571B 01CE                <1> 	add	esi, ecx ; PTE offset (for the parent)
  3185 0000571D 8B1E                <1> 	mov	ebx, [esi]
  3186 0000571F F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3187 00005722 7413                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3188 00005724 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3189 00005728 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3190 0000572D 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3191 0000572F 7506                <1> 	jne	short dmem_acc_3	; not same page
  3192                              <1> 				; deallocate the child's page
  3193 00005731 800E02              <1>         or      byte [esi], PTE_A_WRITE ; convert to writable page (parent)
  3194                              <1> 	;pop	ebx
  3195 00005734 59                  <1> 	pop	ecx
  3196 00005735 EB0C                <1> 	jmp	short dmem_acc_5
  3197                              <1> dmem_acc_3:
  3198                              <1> 	;pop	ebx
  3199 00005737 59                  <1> 	pop	ecx
  3200                              <1> dmem_acc_4:	
  3201 00005738 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
  3202 0000573C 7505                <1> 	jnz	short dmem_acc_5   ; AVL bit 1 = 1, do not deallocate this page!
  3203                              <1> 	;
  3204                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3205 0000573E E814F6FFFF          <1> 	call	deallocate_page
  3206                              <1> dmem_acc_5:
  3207                              <1> 	;pop	esi
  3208                              <1> 	;pop	edi
  3209                              <1> dmem_acc_6:
  3210 00005743 89E8                <1> 	mov	eax, ebp ; physical page (offset=0) address
  3211                              <1> 	; EAX = memory page address
  3212                              <1> 	; EDX = PTE entry address (physical)
  3213 00005745 660D0704            <1> 	or	ax, PTE_A_PRESENT+PTE_A_USER+PTE_A_WRITE+PTE_SHARED
  3214                              <1> 			; present flag, bit 0 = 1
  3215                              <1> 			; user flag, bit 2 = 1	
  3216                              <1> 			; writable flag, bit 1 = 1
  3217                              <1> 			; direct memory access flag, bit 10 = 1
  3218                              <1> 			; (This page must not be deallocated!)
  3219 00005749 8902                <1> 	mov	[edx], eax  ; Update PTE value
  3220 0000574B 49                  <1> 	dec	ecx ; remain count of contiguous pages
  3221 0000574C 7414                <1> 	jz	short dmem_acc_8
  3222 0000574E 81C500100000        <1> 	add	ebp, PAGE_SIZE ; next virtual (=pysical) page address
  3223 00005754 89E8                <1> 	mov	eax, ebp
  3224 00005756 E940FFFFFF          <1>         jmp     dmem_acc_0
  3225                              <1> dmem_acc_7:  ; ERROR ! 
  3226 0000575B C7042404000000      <1> 	mov	dword [esp], ERR_MINOR_IM 
  3227                              <1> 		; Insufficient memory (minor) error!
  3228                              <1> 		; Major error = 0 (No protection fault)	
  3229                              <1> 	; cf = 1
  3230                              <1> dmem_acc_8:
  3231 00005762 58                  <1> 	pop	eax
  3232                              <1> 	;pop	edx
  3233                              <1> 	;pop	ecx
  3234                              <1> 	;pop	ebx
  3235                              <1> 	;pop	ebp
  3236 00005763 C3                  <1> 	retn
  3237                              <1> 
  3238                              <1> deallocate_user_pages:
  3239                              <1> 	; 20/02/2017
  3240                              <1> 	; 19/02/2017 (TRDOS 386 = TRDOS v2.0)
  3241                              <1> 	;
  3242                              <1> 	; Deallocate virtually contiguous user pages (memory block)
  3243                              <1> 	; (caller: 'sysdalloc' system call)
  3244                              <1> 	;
  3245                              <1> 	; INPUT ->
  3246                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3247                              <1> 	;	ECX = byte count
  3248                              <1> 	;	[u.pgdir] = user's page directory
  3249                              <1> 	;	[u.ppdir] = parent's page directory
  3250                              <1> 	;
  3251                              <1> 	; OUTPUT ->
  3252                              <1> 	;    If CF = 0 	
  3253                              <1> 	;	EAX = Deallocated memory bytes
  3254                              <1> 	;	  (Even if shared or read only pages will not be
  3255                              <1> 	;	   deallocated on M.A.T., this byte count will be
  3256                              <1> 	;	   returned as virtually deallocated bytes; in fact
  3257                              <1> 	;	   virtually deallocated user pages * 4096.) 
  3258                              <1> 	;	EBX = Virtual address (as rounded up)
  3259                              <1> 	;    If CF = 1    	
  3260                              <1> 	;	EAX = 0 (there is not any deallocated pages)
  3261                              <1> 	;
  3262                              <1> 	; Note: Empty page tables will not be deallocated!!!
  3263                              <1> 	;     (they will be deallocated at process termination stage)
  3264                              <1> 	;
  3265                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3266                              <1> 	;
  3267 00005764 89DE                <1> 	mov	esi, ebx
  3268 00005766 89F7                <1> 	mov	edi, esi
  3269 00005768 01CF                <1> 	add	edi, ecx
  3270 0000576A 81C6FF0F0000        <1> 	add	esi, PAGE_SIZE - 1  ; 4095 (round up)	
  3271 00005770 C1EE0C              <1> 	shr	esi, PAGE_SHIFT
  3272 00005773 C1EF0C              <1> 	shr	edi, PAGE_SHIFT
  3273 00005776 89F8                <1> 	mov	eax, edi ; end page
  3274 00005778 29F0                <1> 	sub	eax, esi ; end page - start page
  3275 0000577A 0F86D6000000        <1> 	jna	da_u_pd_err  ; < 1
  3276 00005780 89F3                <1> 	mov	ebx, esi
  3277 00005782 C1E30C              <1> 	shl	ebx, PAGE_SHIFT ; virtual address (as rounded up)
  3278 00005785 53                  <1> 	push	ebx ; *
  3279 00005786 89C1                <1> 	mov	ecx, eax ; page count
  3280 00005788 C1E00C              <1> 	shl	eax, PAGE_SHIFT ; byte count as adjusted
  3281 0000578B 50                  <1> 	push	eax ; **
  3282 0000578C 8B1D[545D0100]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3283 00005792 81C600040000        <1>  	add	esi, CORE/PAGE_SIZE 
  3284 00005798 89F7                <1> 	mov	edi, esi
  3285 0000579A 57                  <1> 	push	edi ; *** ; PTE index (of page directory)
  3286 0000579B C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3287 0000579E 89F2                <1> 	mov	edx, esi 
  3288                              <1> 	; EDX = PDE index
  3289 000057A0 C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3290 000057A3 01DE                <1> 	add	esi, ebx ; add page directory address
  3291                              <1> da_u_pd_1:
  3292 000057A5 AD                  <1> 	lodsd
  3293                              <1> 	;
  3294 000057A6 89F5                <1> 	mov	ebp, esi ; 20/02/2017
  3295                              <1> 	; EBP = next PDE address
  3296                              <1> 	;
  3297 000057A8 A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3298 000057AA 0F8493000000        <1> 	jz	da_u_pd_2	
  3299 000057B0 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3300                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3301 000057B4 8B3C24              <1> 	mov	edi, [esp] ; ***
  3302                              <1> 	; EDI = PTE index (of complete page directory)
  3303 000057B7 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry in the page table
  3304 000057BD C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3305 000057C0 89FE                <1> 	mov	esi, edi ; PTE offset in page table (0-4092)
  3306 000057C2 01C6                <1> 	add	esi, eax ; now, esi points to requested PTE
  3307                              <1> da_u_pt_0:
  3308 000057C4 AD                  <1> 	lodsd
  3309 000057C5 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
  3310 000057C7 743F                <1> 	jz	short da_u_pt_1
  3311                              <1> 	;
  3312 000057C9 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3313                              <1> 				  ; (must be 1)
  3314 000057CB 7549                <1> 	jnz	short da_u_pt_3
  3315                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3316 000057CD 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3317                              <1> 				   ; as child's page ?
  3318 000057D1 744E                <1> 	jz	short da_u_pt_4 ; Clear PTE but don't deallocate the page!
  3319                              <1> 	;
  3320                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3321                              <1> 	; EDX = page directory entry index (0-1023)
  3322 000057D3 52                  <1> 	push	edx ; ****
  3323                              <1> 	; EDI = page table entry offset (0-4092)
  3324 000057D4 8B1D[585D0100]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  3325 000057DA 66C1E202            <1> 	shl	dx, 2 ; *4 
  3326 000057DE 01D3                <1> 	add	ebx, edx ; PTE address,0 (for the parent)
  3327 000057E0 8B13                <1> 	mov	edx, [ebx] ; page table address
  3328 000057E2 F6C201              <1> 	test	dl, PDE_A_PRESENT ; present (valid) or not ?
  3329 000057E5 742E                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3330 000057E7 6681E200F0          <1> 	and	dx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3331                              <1> 	; EDI = page table entry offset (0-4092)
  3332 000057EC 01D7                <1> 	add	edi, edx	; PTE address (for the parent)
  3333 000057EE 8B1F                <1> 	mov	ebx, [edi]
  3334 000057F0 F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3335 000057F3 7420                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3336 000057F5 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3337 000057F9 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3338 000057FE 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3339 00005800 7513                <1> 	jne	short da_u_pt_2	; not same page
  3340                              <1> 				; deallocate the child's page
  3341 00005802 800F02              <1>         or      byte [edi], PTE_A_WRITE ; convert to writable page (parent)
  3342 00005805 5A                  <1> 	pop	edx ; ****
  3343 00005806 EB19                <1> 	jmp	short da_u_pt_4
  3344                              <1> da_u_pt_1:
  3345 00005808 09C0                <1> 	or	eax, eax	; swapped page ?
  3346 0000580A 741C                <1> 	jz	short da_u_pt_5	; no
  3347                              <1> 				; yes
  3348 0000580C D1E8                <1> 	shr	eax, 1
  3349 0000580E E8EBF9FFFF          <1> 	call	unlink_swap_block ; Deallocate swapped page block
  3350                              <1> 				  ; on the swap disk (or in file)
  3351 00005813 EB13                <1> 	jmp	short da_u_pt_5
  3352                              <1> da_u_pt_2:
  3353 00005815 5A                  <1> 	pop	edx ; ****
  3354                              <1> da_u_pt_3:
  3355 00005816 66A90004            <1> 	test	ax, PTE_SHARED	; shared or direct memory access indicator
  3356 0000581A 7505                <1> 	jnz	short da_u_pt_4	; AVL bit 1 = 1, do not deallocate this page!
  3357                              <1> 	;
  3358                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3359 0000581C E836F5FFFF          <1> 	call	deallocate_page ; set the mem allocation bit of this page
  3360                              <1> da_u_pt_4:
  3361 00005821 C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
  3362                              <1> da_u_pt_5:
  3363 00005828 58                  <1> 	pop	eax ; *** PTE index (of page directory)
  3364 00005829 49                  <1> 	dec	ecx ; remain page count
  3365 0000582A 7427                <1> 	jz	short da_u_pd_3
  3366 0000582C 40                  <1> 	inc	eax ; next PTE
  3367 0000582D 50                  <1> 	push	eax ; *** ; save again
  3368 0000582E 89C7                <1> 	mov	edi, eax
  3369 00005830 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry index in the page table
  3370 00005836 81FF00040000        <1> 	cmp	edi, PAGE_SIZE / 4 ; 1024
  3371 0000583C 7305                <1> 	jnb	short da_u_pd_2
  3372 0000583E C1E702              <1> 	shl	edi, 2 ; convert index to dword offset
  3373 00005841 EB81                <1> 	jmp	short da_u_pt_0
  3374                              <1> da_u_pd_2:
  3375 00005843 42                  <1> 	inc	edx
  3376 00005844 81FA00040000        <1> 	cmp	edx, 1024
  3377 0000584A 7307                <1> 	jnb	short da_u_pd_3
  3378 0000584C 89EE                <1> 	mov	esi, ebp ; 20/02/2017
  3379 0000584E E952FFFFFF          <1> 	jmp	da_u_pd_1
  3380                              <1> da_u_pd_3:
  3381 00005853 58                  <1> 	pop	eax ; **
  3382 00005854 5B                  <1> 	pop	ebx ; *
  3383 00005855 C3                  <1> 	retn
  3384                              <1> 
  3385                              <1> da_u_pd_err:
  3386 00005856 31C0                <1> 	xor	eax, eax
  3387 00005858 F9                  <1> 	stc	
  3388 00005859 C3                  <1> 	retn
  3389                              <1> 
  3390                              <1> allocate_user_pages:
  3391                              <1> 	; 04/03/2017
  3392                              <1> 	; 20/02/2017 (TRDOS 386 = TRDOS v2.0)
  3393                              <1> 	;
  3394                              <1> 	; Allocate physically contiguous user pages (memory block)
  3395                              <1> 	; (caller: 'sysalloc' system call)
  3396                              <1> 	;
  3397                              <1> 	; INPUT ->
  3398                              <1> 	;	EAX = PHYSICAL ADDRESS (beginning address)
  3399                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3400                              <1> 	;	ECX = byte count
  3401                              <1> 	;	[u.pgdir] = user's page directory
  3402                              <1> 	;	
  3403                              <1> 	;	Note: All addresses are (must be) already adjusted
  3404                              <1> 	;	to page	borders, otherwise, lower 12bits of addresses
  3405                              <1> 	;	and byte count would be truncated.
  3406                              <1> 	;
  3407                              <1> 	; OUTPUT ->
  3408                              <1> 	;	none
  3409                              <1> 	;
  3410                              <1> 	;	CF = 1 -> insufficient memory error
  3411                              <1> 	;
  3412                              <1> 	; Note: All pages will be allocated in physical page order 
  3413                              <1> 	;	from the beginning page address. 
  3414                              <1> 	;	* A new page table will be added to the page dir
  3415                              <1> 	;	  when the requested PDE is invalid.
  3416                              <1> 	;	* Those pages will not be added to swap queue
  3417                              <1> 	;	  because main purpose of this allocation is to
  3418                              <1> 	;	  set a direct memory access (DMA controller) buffer.
  3419                              <1> 	;	 (Swapping out a page in a DMA buffer would be wrong!)
  3420                              <1> 	;	* Previous content of page tables (PTEs) would be
  3421                              <1> 	;	  (should be) deallocated before entering this
  3422                              <1> 	;	  procedure. So, new page table entries (PTEs)
  3423                              <1> 	;	  directly will be written without checking
  3424                              <1> 	;	  their previous content.	
  3425                              <1> 	;	* Only solution to increase free memory by removing
  3426                              <1> 	;	  that non-swappable memory block is to terminate
  3427                              <1> 	;	  the process or to wait until the process will 
  3428                              <1> 	;	  deallocate that memory block as itself. ('sysdalloc')
  3429                              <1> 	;	  (No problem, if the process does not grab all of
  3430                              <1> 	;	  -very big amount of- free memory by using
  3431                              <1> 	;	  'sysalloc' system call!?)
  3432                              <1> 	;	  (Even if the process has grabbed all of free memory, 
  3433                              <1> 	;	  no problem if the process is not running in 
  3434                              <1> 	;	  multitasking mode. No problem in multitasking
  3435                              <1> 	;	  mode if there is not another process which is running
  3436                              <1> 	;	  or waiting or sleeping for an event as it's pages
  3437                              <1> 	;	  are swapped-out. But a new process can not start to
  3438                              <1> 	;	  run if all of free memory has beeen allocated 
  3439                              <1> 	;	  by running processes. Deallocation -'sysdalloc'- 
  3440                              <1> 	;	  or terminate a running process is needed 
  3441                              <1> 	;	  in order to run a new process.) 
  3442                              <1> 	;
  3443                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3444                              <1> 	;
  3445 0000585A 89C5                <1> 	mov	ebp, eax ; physical address
  3446 0000585C 89DE                <1> 	mov	esi, ebx
  3447 0000585E 81C600004000        <1> 	add	esi, CORE ; start of user's memory (4M) 
  3448 00005864 C1EE0C              <1> 	shr	esi, PAGE_SHIFT
  3449 00005867 C1E90C              <1> 	shr	ecx, PAGE_SHIFT
  3450 0000586A 8B1D[545D0100]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3451 00005870 89F7                <1> 	mov	edi, esi
  3452 00005872 57                  <1> 	push	edi  ; * ; PTE index (in page directory)
  3453 00005873 C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3454 00005876 89F2                <1> 	mov	edx, esi 
  3455                              <1> 	; EDX = PDE index
  3456 00005878 C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3457 0000587B 01DE                <1> 	add	esi, ebx ; add page directory address
  3458                              <1> a_u_pd_0:
  3459 0000587D AD                  <1> 	lodsd
  3460                              <1> 	;
  3461 0000587E 89F3                <1> 	mov	ebx, esi ; next PDE address
  3462                              <1> 	;
  3463 00005880 A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3464 00005882 7515                <1> 	jnz	short a_u_pd_2
  3465                              <1> 	;
  3466                              <1> 	; empty PDE (it does not point to valid page table address)
  3467 00005884 E8F0F2FFFF          <1> 	call	allocate_page  ; (allocate a new page table)
  3468 00005889 7302                <1> 	jnc	short a_u_pd_1 ; OK... now, we have a new page table.
  3469                              <1> 	; cf = 1
  3470                              <1> 	; There is not a free memory page to allocate a new page table !!!
  3471 0000588B 5E                  <1> 	pop	esi ; *
  3472 0000588C C3                  <1> 	retn	; return to 'sysalloc' with 'insufficient memory' error
  3473                              <1> 	;
  3474                              <1> a_u_pd_1: ; clear the new page table content 
  3475                              <1> 	; EAX = Physical (base) address of the new page table
  3476 0000588D 89C1                <1> 	mov	ecx, eax
  3477 0000588F E85FF3FFFF          <1> 	call	clear_page ; Clear page content
  3478                              <1> 	;
  3479 00005894 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  3480                              <1> 		 ; set bit 0, bit 1 and bit 2 to 1
  3481                              <1> 		 ; (present, writable, user)
  3482 00005896 8946FC              <1> 	mov	[esi-4], eax
  3483                              <1> a_u_pd_2:
  3484 00005899 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3485                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3486 0000589D 8B3C24              <1> 	mov	edi, [esp] ; ***
  3487                              <1> 	; EDI = PTE index (of page directory)
  3488 000058A0 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry index in the page table	
  3489                              <1> 	; EBX = next PDE address
  3490 000058A6 89FE                <1> 	mov	esi, edi ; PTE index in page table (0-1023)
  3491 000058A8 C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3492 000058AB 01C7                <1> 	add	edi, eax ; now, edi points to requested PTE
  3493                              <1> a_u_pt_0:
  3494 000058AD 89E8                <1> 	mov	eax, ebp ; physical address
  3495 000058AF 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER ; 04/03/2017
  3496 000058B1 AB                  <1> 	stosd
  3497 000058B2 49                  <1> 	dec	ecx ; remain page count
  3498 000058B3 741C                <1> 	jz	short a_u_pd_4
  3499 000058B5 81C500100000        <1> 	add	ebp, PAGE_SIZE
  3500 000058BB 46                  <1> 	inc	esi ; next PTE (index)
  3501 000058BC 81FE00040000        <1> 	cmp	esi, PAGE_SIZE/4 ; 1024
  3502 000058C2 72E9                <1> 	jb	short a_u_pt_0
  3503                              <1> a_u_pd_3:
  3504 000058C4 42                  <1> 	inc	edx
  3505 000058C5 81FA00040000        <1> 	cmp	edx, 1024
  3506 000058CB 7304                <1> 	jnb	short a_u_pd_4
  3507 000058CD 89DE                <1> 	mov	esi, ebx ; the next PDE address
  3508 000058CF EBAC                <1> 	jmp	short a_u_pd_0
  3509                              <1> a_u_pd_4:
  3510 000058D1 5F                  <1> 	pop	edi ; *
  3511 000058D2 C3                  <1> 	retn
  3512                              <1> 
  3513                              <1> ; /// End Of MEMORY MANAGEMENT FUNCTIONS ///
  3514                              <1> 
  3515                              <1> ;; Data:
  3516                              <1> 
  3517                              <1> ; 09/03/2015
  3518                              <1> ;swpq_count: dw 0 ; count of pages on the swap que
  3519                              <1> ;swp_drv:    dd 0 ; logical drive description table address of the swap drive/disk
  3520                              <1> ;swpd_size:  dd 0 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  3521                              <1> ;swpd_free:  dd 0 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  3522                              <1> ;swpd_next:  dd 0 ; next free page block
  3523                              <1> ;swpd_last:  dd 0 ; last swap page block
  2159                                  %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 000058D3 9C                  <1> 	pushfd
    30 000058D4 0E                  <1> 	push 	cs
    31 000058D5 E801000000          <1> 	call 	TIME_OF_DAY_1
    32 000058DA 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 000058DB 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   113                              <1> 	;
   114 000058E0 80FC08              <1> 	cmp	ah, (RTC_TBE-RTC_TB)/4	; CHECK IF COMMAND IN VALID RANGE (0-7)
   115 000058E3 F5                  <1> 	cmc				; COMPLEMENT CARRY FOR ERROR EXIT
   116                              <1> 	; (*) jc short TIME_9		; EXIT WITH CARRY = 1 IF NOT VALID
   117 000058E4 721A                <1> 	jc	short _TIME_9 ; 29/05/2016
   118                              <1> 
   119 000058E6 1E                  <1> 	push	ds
   120 000058E7 56                  <1> 	push	esi
   121 000058E8 66BE1000            <1> 	mov	si, KDATA		; kernel data segment
   122 000058EC 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 000058EE C0E402              <1> 	shl	ah, 2			; convert function to dword offset
   131 000058F1 0FB6F4              <1> 	movzx	esi, ah			; PLACE INTO ADDRESSING REGISTER
   132                              <1> 	;cli				; NO INTERRUPTS DURING TIME FUNCTIONS
   133 000058F4 FF96[06590000]      <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 000058FA B400                <1> 	mov	ah, 0			; CLEAR (AH) TO ZERO
   137 000058FC 5E                  <1> 	pop	esi			; RECOVER USERS REGISTER
   138 000058FD 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 000058FE 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 00005900 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 00005905 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 00005906 [26590000]          <1> 	dd	RTC_00			; 0 = READ CURRENT CLOCK COUNT
   181 0000590A [39590000]          <1> 	dd	RTC_10			; 1 = SET CLOCK COUNT
   182 0000590E [47590000]          <1> 	dd	RTC_20			; 2 = READ THE REAL TIME CLOCK TIME
   183 00005912 [76590000]          <1> 	dd	RTC_30			; 3 = SET REAL TIME CLOCK TIME
   184 00005916 [B8590000]          <1> 	dd	RTC_40			; 4 = READ THE REAL TIME CLOCK DATE
   185 0000591A [E5590000]          <1> 	dd	RTC_50			; 5 = SET REAL TIME CLOCK DATE
   186 0000591E [325A0000]          <1> 	dd	RTC_60			; 6 = SET THE REAL TIME CLOCK ALARM
   187 00005922 [855A0000]          <1> 	dd	RTC_70			; 7 = RESET ALARM
   188                              <1> 
   189                              <1> RTC_TBE	equ	$
   190                              <1> 
   191                              <1> RTC_00:				; READ TIME COUNT
   192 00005926 A0[64420100]        <1> 	mov	al, [TIMER_OFL]		; GET THE OVERFLOW FLAG
   193 0000592B C605[64420100]00    <1> 	mov	byte [TIMER_OFL], 0	; AND THEN RESET THE OVERFLOW FLAG
   194 00005932 8B0D[60420100]      <1>         mov     ecx, [TIMER_LH]         ; GET COUNT OF TIME
   195 00005938 C3                  <1> 	retn
   196                              <1> 
   197                              <1> RTC_10:				; SET TIME COUNT
   198 00005939 890D[60420100]      <1>         mov     [TIMER_LH], ecx         ; SET TIME COUNT
   199 0000593F C605[64420100]00    <1> 	mov	byte [TIMER_OFL], 0	; RESET OVERFLOW FLAG
   200 00005946 C3                  <1> 	retn				; RETURN WITH NO CARRY
   201                              <1> 
   202                              <1> RTC_20:				; GET RTC TIME
   203 00005947 E8EB010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   204 0000594C 7227                <1> 	jc	short RTC_29		; EXIT IF ERROR (CY= 1)
   205                              <1> 
   206 0000594E B000                <1> 	mov	al, CMOS_SECONDS	; SET ADDRESS OF SECONDS
   207 00005950 E8FD010000          <1> 	call	CMOS_READ		; GET SECONDS
   208 00005955 88C6                <1> 	mov	dh, al			; SAVE
   209 00005957 B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   210 00005959 E8F4010000          <1> 	call	CMOS_READ		; READ CURRENT VALUE OF DSE BIT
   211 0000595E 2401                <1> 	and	al, 00000001b		; MASK FOR VALID DSE BIT
   212 00005960 88C2                <1> 	mov	dl, al			; SET [DL] TO ZERO FOR NO DSE BIT
   213 00005962 B002                <1> 	mov	al, CMOS_MINUTES	; SET ADDRESS OF MINUTES
   214 00005964 E8E9010000          <1> 	call	CMOS_READ		; GET MINUTES
   215 00005969 88C1                <1> 	mov	cl, al			; SAVE
   216 0000596B B004                <1>         mov     al, CMOS_HOURS          ; SET ADDRESS OF HOURS
   217 0000596D E8E0010000          <1> 	call	CMOS_READ		; GET HOURS
   218 00005972 88C5                <1> 	mov	ch, al			; SAVE
   219 00005974 F8                  <1> 	clc				; SET CY= 0
   220                              <1> RTC_29:
   221 00005975 C3                  <1> 	retn				; RETURN WITH RESULT IN CARRY FLAG
   222                              <1> 
   223                              <1> RTC_30:				; SET RTC TIME
   224 00005976 E8BC010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   225 0000597B 7305                <1> 	jnc	short RTC_35		; GO AROUND IF CLOCK OPERATING
   226 0000597D E817010000          <1> 	call	RTC_STA			; ELSE TRY INITIALIZING CLOCK
   227                              <1> RTC_35:
   228 00005982 88F4                <1> 	mov	ah, dh			; GET TIME BYTE - SECONDS
   229 00005984 B000                <1> 	mov	al, CMOS_SECONDS	; ADDRESS SECONDS
   230 00005986 E8E0010000          <1> 	call	CMOS_WRITE		; UPDATE SECONDS
   231 0000598B 88CC                <1> 	mov	ah, cl			; GET TIME BYTE - MINUTES
   232 0000598D B002                <1> 	mov	al, CMOS_MINUTES	; ADDRESS MINUTES
   233 0000598F E8D7010000          <1> 	call	CMOS_WRITE		; UPDATE MINUTES
   234 00005994 88EC                <1> 	mov	ah, ch			; GET TIME BYTE - HOURS
   235 00005996 B004                <1> 	mov	al, CMOS_HOURS		; ADDRESS HOURS
   236 00005998 E8CE010000          <1> 	call	CMOS_WRITE		; UPDATE ADDRESS
   237                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   238                              <1> 	;mov	ah, al
   239 0000599D 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   240 000059A1 E8AC010000          <1> 	call	CMOS_READ		; READ CURRENT TIME
   241 000059A6 2462                <1> 	and	al, 01100010b		; MASK FOR VALID BIT POSITIONS
   242 000059A8 0C02                <1> 	or	al, 00000010b		; TURN ON 24 HOUR MODE
   243 000059AA 80E201              <1> 	and	dl, 00000001b		; USE ONLY THE DSE BIT
   244 000059AD 08D0                <1> 	or	al, dl			; GET DAY LIGHT SAVINGS TIME BIT (OSE)
   245 000059AF 86E0                <1> 	xchg	ah, al			; PLACE IN WORK REGISTER AND GET ADDRESS
   246 000059B1 E8B5010000          <1> 	call	CMOS_WRITE		; SET NEW ALARM SITS
   247 000059B6 F8                  <1> 	clc				; SET CY= 0
   248 000059B7 C3                  <1> 	retn				; RETURN WITH CY= 0
   249                              <1> 
   250                              <1> RTC_40:				; GET RTC DATE
   251 000059B8 E87A010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   252 000059BD 7225                <1> 	jc	short RTC_49		; EXIT IF ERROR (CY= 1)
   253                              <1> 
   254 000059BF B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH
   255 000059C1 E88C010000          <1> 	call	CMOS_READ		; READ DAY OF MONTH
   256 000059C6 88C2                <1> 	mov	dl, al			; SAVE
   257 000059C8 B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH
   258 000059CA E883010000          <1> 	call	CMOS_READ		; READ MONTH
   259 000059CF 88C6                <1> 	mov	dh, al			; SAVE
   260 000059D1 B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR
   261 000059D3 E87A010000          <1> 	call	CMOS_READ		; READ YEAR
   262 000059D8 88C1                <1> 	mov	cl, al			; SAVE
   263 000059DA B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY LOCATION
   264 000059DC E871010000          <1> 	call	CMOS_READ		; GET CENTURY BYTE
   265 000059E1 88C5                <1> 	mov	ch, al			; SAVE
   266 000059E3 F8                  <1> 	clc				; SET CY=0
   267                              <1> RTC_49:
   268 000059E4 C3                  <1> 	retn				; RETURN WITH RESULTS IN CARRY FLAG
   269                              <1> 
   270                              <1> RTC_50:				; SET RTC DATE
   271 000059E5 E84D010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   272 000059EA 7305                <1> 	jnc	short RTC_55		; GO AROUND IF NO ERROR
   273 000059EC E8A8000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   274                              <1> RTC_55:
   275 000059F1 66B80600            <1> 	mov	ax, CMOS_DAY_WEEK	; ADDRESS OF DAY OF WEEK BYTE
   276 000059F5 E871010000          <1> 	call	CMOS_WRITE		; LOAD ZEROS TO DAY OF WEEK
   277 000059FA 88D4                <1> 	mov	ah, dl			; GET DAY OF MONTH BYTE
   278 000059FC B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH BYTE
   279 000059FE E868010000          <1> 	call	CMOS_WRITE		; WRITE OF DAY OF MONTH REGISTER
   280 00005A03 88F4                <1> 	mov	ah, dh			; GET MONTH
   281 00005A05 B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH BYTE
   282 00005A07 E85F010000          <1> 	call	CMOS_WRITE		; WRITE MONTH REGISTER
   283 00005A0C 88CC                <1> 	mov	ah, cl			; GET YEAR BYTE
   284 00005A0E B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR REGISTER
   285 00005A10 E856010000          <1> 	call	CMOS_WRITE		; WRITE YEAR REGISTER
   286 00005A15 88EC                <1> 	mov	ah, ch			; GET CENTURY BYTE
   287 00005A17 B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY BYTE
   288 00005A19 E84D010000          <1> 	call	CMOS_WRITE		; WRITE CENTURY LOCATION
   289                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   290                              <1> 	;mov	ah, al
   291 00005A1E 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   292 00005A22 E82B010000          <1> 	call	CMOS_READ		; READ WIRRENT SETTINGS
   293 00005A27 247F                <1> 	and	al, 07Fh		; CLEAR 'SET BIT'
   294 00005A29 86E0                <1> 	xchg	ah, al			; MOVE TO WORK REGISTER
   295 00005A2B E83B010000          <1> 	call	CMOS_WRITE		; AND START CLOCK UPDATING
   296 00005A30 F8                  <1> 	clc				; SET CY= 0
   297 00005A31 C3                  <1> 	retn				; RETURN CY=0
   298                              <1> 
   299                              <1> RTC_60:				; SET RTC ALARM
   300 00005A32 B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM
   301 00005A34 E819010000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   302 00005A39 A820                <1> 	test	al, 20h			; CHECK FOR ALARM ALREADY ENABLED
   303 00005A3B F9                  <1> 	stc				; SET CARRY IN CASE OF ERROR
   304 00005A3C 7542                <1> 	jnz	short RTC_69		; ERROR EXIT IF ALARM SET
   305 00005A3E E8F4000000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   306 00005A43 7305                <1> 	jnc	short RTC_65		; SKIP INITIALIZATION IF NO ERROR
   307 00005A45 E84F000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   308                              <1> RTC_65:	
   309 00005A4A 88F4                <1> 	mov	ah, dh			; GET SECONDS BYTE
   310 00005A4C B001                <1> 	mov	al, CMOS_SEC_ALARM	; ADDRESS THE SECONDS ALARM REGISTER
   311 00005A4E E818010000          <1> 	call	CMOS_WRITE		; INSERT SECONDS
   312 00005A53 88CC                <1> 	mov	ah, cl			; GET MINUTES PARAMETER
   313 00005A55 B003                <1> 	mov	al, CMOS_MIN_ALARM	; ADDRESS MINUTES ALARM REGISTER
   314 00005A57 E80F010000          <1> 	call	CMOS_WRITE		; INSERT MINUTES
   315 00005A5C 88EC                <1> 	mov	ah, ch			; GET HOURS PARAMETER
   316 00005A5E B005                <1> 	mov	al, CMOS_HR_ALARM	; ADDRESS HOUR ALARM REGISTER
   317 00005A60 E806010000          <1> 	call	CMOS_WRITE		; INSERT HOURS
   318 00005A65 E4A1                <1> 	in	al, INTB01		; READ SECOND INTERRUPT MASK REGISTER
   319 00005A67 24FE                <1> 	and	al, 0FEh		; ENABLE ALARM TIMER BIT (CY= 0)
   320 00005A69 E6A1                <1> 	out	INTB01, al		; WRITE UPDATED MASK
   321                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   322                              <1> 	;mov	ah, al
   323 00005A6B 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   324 00005A6F E8DE000000          <1> 	call	CMOS_READ		; READ CURRENT ALARM REGISTER
   325 00005A74 247F                <1> 	and	al, 07Fh		; ENSURE SET BIT TURNED OFF
   326 00005A76 0C20                <1> 	or	al, 20h			; TURN ON ALARM ENABLE
   327 00005A78 86E0                <1> 	xchg	ah, al			; MOVE MASK TO OUTPUT REGISTER
   328 00005A7A E8EC000000          <1> 	call	CMOS_WRITE		; WRITE NEW ALARM MASK
   329 00005A7F F8                  <1> 	clc				; SET CY= 0
   330                              <1> RTC_69:
   331 00005A80 66B80000            <1> 	mov	ax, 0			; CLEAR AX REGISTER
   332 00005A84 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 00005A85 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257	; ADDRESS ALARM REGISTER (TO BOTH AH,AL)
   338 00005A89 E8C4000000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   339 00005A8E 2457                <1> 	and	al, 57h			; TURN OFF ALARM ENABLE
   340 00005A90 86E0                <1> 	xchg	ah, al			; SAVE DATA AND RECOVER ADDRESS
   341 00005A92 E8D4000000          <1> 	call	CMOS_WRITE		; RESTORE NEW VALUE
   342 00005A97 F8                  <1> 	clc				; SET CY= 0
   343 00005A98 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 00005A99 66B80A26            <1> 	mov	ax, (26h*100h)+CMOS_REG_A
   349 00005A9D 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 00005AA2 66B80B82            <1> 	mov	ax, (82h*100h)+CMOS_REG_B
   353 00005AA6 E8C0000000          <1> 	call	CMOS_WRITE		; AND 24 HOUR MODE TO REGISTER B
   354 00005AAB B00C                <1> 	mov	al, CMOS_REG_C		; ADDRESS REGISTER C
   355 00005AAD E8A0000000          <1> 	call	CMOS_READ		; READ REGISTER C TO INITIALIZE
   356 00005AB2 B00D                <1> 	mov	al, CMOS_REG_D		; ADDRESS REGISTER D
   357 00005AB4 E899000000          <1> 	call	CMOS_READ		; READ REGISTER D TO INITIALIZE
   358 00005AB9 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 00005ABA 1E                  <1> 	push	ds			; LEAVE INTERRUPTS DISABLED
   380 00005ABB 50                  <1> 	push	eax			; SAVE REGISTERS
   381 00005ABC 57                  <1> 	push	edi
   382                              <1> RTC_I_1:				; CHECK FOR SECOND INTERRUPT
   383 00005ABD 66B88C8B            <1> 	mov	ax, 256*(CMOS_REG_B+NMI)+CMOS_REG_C+NMI ; ALARM AND STATUS
   384 00005AC1 E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM FLAG MASK ADDRESS
   385 00005AC3 90                  <1> 	nop				; I/O DELAY
   386 00005AC4 EB00                <1> 	jmp	short $+2
   387 00005AC6 E471                <1> 	in	al, CMOS_DATA		; READ AND RESET INTERRUPT REQUEST FLAGS
   388 00005AC8 A860                <1> 	test	al, 01100000b		; CHECK FOR EITHER INTERRUPT PENDING
   389 00005ACA 745D                <1> 	jz	short	RTC_I_9		; EXIT IF NOT A VALID RTC INTERRUPT
   390                              <1> 
   391 00005ACC 86E0                <1> 	xchg	ah, al			; SAVE FLAGS AND GET ENABLE ADDRESS
   392 00005ACE E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM ENABLE MASK ADDRESS
   393 00005AD0 90                  <1> 	nop				; I/O DELAY
   394 00005AD1 EB00                <1> 	jmp	short $+2	
   395 00005AD3 E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ALARM ENABLE MASK
   396 00005AD5 20E0                <1> 	and	al, ah			; ALLOW ONLY SOURCES THAT ARE ENABLED
   397 00005AD7 A840                <1> 	test	al, 01000000b		; CHECK FOR PERIODIC INTERRUPT
   398 00005AD9 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 00005ADB 66BF1000            <1> 	mov	di, KDATA		; kernel data segment
   403 00005ADF 8EDF                <1> 	mov	ds, di
   404                              <1> 	
   405 00005AE1 812D[58420100]D003- <1> 	sub	dword [RTC_LH], 976	; DECREMENT COUNT BY 1/1024
   405 00005AE9 0000                <1>
   406 00005AEB 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 00005AED 6650                <1> 	push	ax			; SAVE INTERRUPT FLAG MASK
   411 00005AEF 66B88B8B            <1> 	mov	ax, 257*(CMOS_REG_B+NMI) ; INTERRUPT ENABLE REGISTER
   412 00005AF3 E670                <1> 	out	CMOS_PORT, al		; WRITE ADDRESS TO CMOS CLOCK
   413 00005AF5 90                  <1> 	nop				; I/O DELAY
   414 00005AF6 EB00                <1> 	jmp	short $+2
   415 00005AF8 E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ENABLES
   416 00005AFA 24BF                <1> 	and	al, 0BFh		; TURN OFF PIE
   417 00005AFC 86C4                <1> 	xchg	al, ah			; GET CMOS ADDRESS AND SAVE VALUE
   418 00005AFE E670                <1> 	out	CMOS_PORT, al		; ADDRESS REGISTER B
   419 00005B00 86C4                <1> 	xchg	al, ah			; GET NEW INTERRUPT ENABLE MASK
   420 00005B02 E671                <1> 	out	CMOS_DATA, al		; SET MASK IN INTERRUPT ENABLE REGISTER
   421 00005B04 C605[5C420100]00    <1> 	mov	byte [RTC_WAIT_FLAG], 0	; SET FUNCTION ACTIVE FLAG OFF
   422 00005B0B 8B3D[5D420100]      <1> 	mov	edi, [USER_FLAG]	; SET UP (DS:DI) TO POINT TO USER FLAG
   423 00005B11 C60780              <1> 	mov	byte [edi], 80h		; TURN ON USERS FLAG
   424 00005B14 6658                <1> 	pop	ax			; GET INTERRUPT SOURCE BACK
   425                              <1> RTC_I_5:
   426 00005B16 A820                <1> 	test	al, 00100000b		; TEST FOR ALARM INTERRUPT
   427 00005B18 740D                <1> 	jz	short RTC_I_7		; SKIP USER INTERRUPT CALL IF NOT ALARM
   428                              <1> 
   429 00005B1A B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   430 00005B1C E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   431 00005B1E FB                  <1> 	sti				; INTERRUPTS BACK ON NOW
   432 00005B1F 52                  <1> 	push	edx
   433 00005B20 E8A3970000          <1> 	call	INT4Ah			; TRANSFER TO USER ROUTINE
   434 00005B25 5A                  <1> 	pop	edx
   435 00005B26 FA                  <1> 	cli				; BLOCK INTERRUPT FOR RETRY
   436                              <1> RTC_I_7:				; RESTART ROUTINE TO HANDLE DELAYED
   437 00005B27 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 00005B29 B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   441 00005B2B E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   442 00005B2D B020                <1> 	mov	al, EOI			; END OF INTERRUPT MASK TO 8259 - 2
   443 00005B2F E6A0                <1> 	out	INTB00, al		; TO 8259 - 2
   444 00005B31 E620                <1> 	out	INTA00,	al		; TO 8259 - 1
   445 00005B33 5F                  <1> 	pop	edi			; RESTORE REGISTERS
   446 00005B34 58                  <1> 	pop	eax
   447 00005B35 1F                  <1> 	pop	ds
   448 00005B36 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 00005B37 51                  <1> 	push	ecx
   456                              <1> 
   457                              <1> 	; 29/05/2016
   458 00005B38 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 00005B3D B00A                <1> 	mov	al, CMOS_REG_A		; ADDRESS STATUS REGISTER A
   467 00005B3F FA                  <1> 	cli				; NO TIMER INTERRUPTS DURING UPDATES
   468 00005B40 E80D000000          <1> 	call	CMOS_READ		; READ UPDATE IN PROCESS FLAG
   469 00005B45 A880                <1> 	test	al, 80h			; IF UIP BIT IS ON ( CANNOT READ TIME )
   470 00005B47 7406                <1> 	jz	short UPD_90		; EXIT WITH CY= 0 IF CAN READ CLOCK NOW
   471 00005B49 FB                  <1> 	sti				; ALLOW INTERRUPTS WHILE WAITING
   472 00005B4A E2F1                <1> 	loop	UPD_10			; LOOP TILL READY OR TIMEOUT
   473 00005B4C 31C0                <1> 	xor	eax, eax		; CLEAR RESULTS IF ERROR
   474                              <1> 		; xor ax, ax
   475 00005B4E F9                  <1> 	stc				; SET CARRY FOR ERROR
   476                              <1> UPD_90:
   477 00005B4F 59                  <1> 	pop	ecx			; RESTORE CALLERS REGISTER
   478 00005B50 FA                  <1> 	cli				; INTERRUPTS OFF DURING SET
   479 00005B51 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 00005B52 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   503 00005B53 D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   504 00005B55 F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   505 00005B56 D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   506 00005B58 FA                  <1> 	cli				; DISABLE INTERRUPTS
   507 00005B59 E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   508                              <1> 	; 29/05/2016
   509                              <1> 	;nop				; I/O DELAY
   510 00005B5B E6EB                <1> 	out	0ebh,al	; NEWIODELAY ; AWARD BIOS 1999, ATIME.ASM
   511                              <1> 	;
   512 00005B5D E471                <1> 	in	al, CMOS_DATA		; READ THE REQUESTED CMOS LOCATION
   513 00005B5F 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 00005B61 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 00005B63 D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   519 00005B65 E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   520 00005B67 6658                <1> 	pop	ax			; RESTORE (AH) AND (AL), CMOS BYTE
   521 00005B69 9D                  <1> 	popf	
   522 00005B6A 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 00005B6B 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   544 00005B6C 6650                <1> 	push	ax			; SAVE WORK REGISTER VALUES
   545 00005B6E D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   546 00005B70 F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   547 00005B71 D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   548 00005B73 FA                  <1> 	cli				; DISABLE INTERRUPTS
   549 00005B74 E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   550 00005B76 88E0                <1> 	mov	al, ah			; GET THE DATA BYTE TO WRITE
   551 00005B78 E671                <1> 	out	CMOS_DATA, al		; PLACE IN REQUESTED CMOS LOCATION
   552 00005B7A 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 00005B7C D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   555 00005B7E E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   556 00005B80 90                  <1> 	nop				; I/O DELAY
   557 00005B81 E471                <1> 	in	al, CMOS_DATA		; OPEN STANDBY LATCH
   558 00005B83 6658                <1> 	pop	ax			; RESTORE WORK REGISTERS
   559 00005B85 9D                  <1> 	popf
   560 00005B86 C3                  <1> 	retn
   561                              <1> 
   562                              <1> ; /// End Of TIMER FUNCTIONS ///
  2160                                  
  2161 00005B87 90<rept>                Align 16
  2162                                  
  2163                                  gdt:	; Global Descriptor Table
  2164                                  	; (30/07/2015, conforming cs)
  2165                                  	; (26/03/2015)
  2166                                  	; (24/03/2015, tss)
  2167                                  	; (19/03/2015)
  2168                                  	; (29/12/2013)
  2169                                  	;
  2170 00005B90 0000000000000000        	dw 0, 0, 0, 0		; NULL descriptor
  2171                                  	; 18/08/2014
  2172                                  			; 8h kernel code segment, base = 00000000h		
  2173                                  	;dw 0FFFFh, 0, 9E00h, 00CFh	; KCODE  ; 30/12/2016	 
  2174 00005B98 FFFF0000009ACF00        	dw 0FFFFh, 0, 9A00h, 00CFh	; KCODE
  2175                                  			; 10h kernel data segment, base = 00000000h	
  2176 00005BA0 FFFF00000092CF00        	dw 0FFFFh, 0, 9200h, 00CFh	; KDATA
  2177                                  			; 1Bh user code segment, base address = 400000h ; CORE
  2178                                  	;dw 0FBFFh, 0, 0FE40h, 00CFh	; UCODE  ; 30/12/2016	
  2179 00005BA8 FFFB000040FACF00        	dw 0FBFFh, 0, 0FA40h, 00CFh	; UCODE 
  2180                                  			; 23h user data segment, base address = 400000h ; CORE
  2181 00005BB0 FFFB000040F2CF00        	dw 0FBFFh, 0, 0F240h, 00CFh	; UDATA
  2182                                  			; Task State Segment
  2183 00005BB8 6700                    	dw 0067h ; Limit = 103 ; (104-1, tss size = 104 byte, 
  2184                                  			       ;  no IO permission in ring 3)
  2185                                  gdt_tss0:
  2186 00005BBA 0000                    	dw 0  ; TSS base address, bits 0-15 
  2187                                  gdt_tss1:
  2188 00005BBC 00                      	db 0  ; TSS base address, bits 16-23 
  2189                                  	      		; 49h	
  2190 00005BBD E9                      	db 11101001b ; E9h => P=1/DPL=11/0/1/0/B/1 --> B = Task is busy (1)
  2191 00005BBE 00                      	db 0 ; G/0/0/AVL/LIMIT=0000 ; (Limit bits 16-19 = 0000) (G=0, 1 byte)
  2192                                  gdt_tss2:
  2193 00005BBF 00                      	db 0  ; TSS base address, bits 24-31 
  2194                                  
  2195                                  gdt_end:
  2196                                  	;; 9Eh = 1001 1110b (GDT byte 5) P=1/DPL=00/1/TYPE=1110, 
  2197                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2198                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2199                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2200                                  
  2201                                  	;; 9Ah = 1001 1010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2202                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2203                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2204                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2205                                  
  2206                                  	;; 92h = 1001 0010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2207                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2208                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2209                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  2210                                  		; W= Writeable, A= Accessed
  2211                                  
  2212                                  	;; FEh = 1111 1110b (GDT byte 5) P=1/DPL=11/1/TYPE=1110, 
  2213                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2214                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2215                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2216                                  	
  2217                                  	;; FAh = 1111 1010b (GDT byte 5) P=1/DPL=11/1/TYPE=1010, 
  2218                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2219                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2220                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2221                                  
  2222                                  	;; F2h = 1111 0010b (GDT byte 5) P=1/DPL=11/1/TYPE=0010, 
  2223                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2224                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2225                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  2226                                  	
  2227                                  	;; CFh = 1100 1111b (GDT byte 6) G=1/B=1/0/AVL=0, Limit=1111b (3)
  2228                                  
  2229                                  		;; Limit = FFFFFh (=> FFFFFh+1= 100000h) // bits 0-15, 48-51 //
  2230                                  		;	 = 100000h * 1000h (G=1) = 4GB
  2231                                  		;; Limit = FFBFFh (=> FFBFFh+1= FFC00h) // bits 0-15, 48-51 //
  2232                                  		;	 = FFC00h * 1000h (G=1) = 4GB - 4MB
  2233                                  		; G= Granularity (1= 4KB), B= Big (32 bit), 
  2234                                  		; AVL= Available to programmers	
  2235                                  
  2236                                  gdtd:
  2237 00005BC0 2F00                            dw gdt_end - gdt - 1    ; Limit (size)
  2238 00005BC2 [905B0000]                      dd gdt			; Address of the GDT
  2239                                  
  2240                                  	; 20/08/2014
  2241                                  idtd:
  2242 00005BC6 7F02                            dw idt_end - idt - 1    ; Limit (size)
  2243 00005BC8 [F83E0100]                      dd idt			; Address of the IDT
  2244                                  
  2245                                  ; 20/02/2017
  2246                                  ;;; 11/03/2015
  2247                                  %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 00005BCC [2F5C0000]          <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 00005BD0 01                  <1> 		DB	01		;DRIVE TYPE, MEDIA TABLE
   113                              <1>                 ;DW      MD_TBL1
   114 00005BD1 [EE5B0000]          <1> 		dd	MD_TBL1
   115 00005BD5 82                  <1> 		DB	02+BIT7ON
   116                              <1> 		;DW      MD_TBL2
   117 00005BD6 [FB5B0000]          <1>                 dd      MD_TBL2
   118 00005BDA 02                  <1> DR_DEFAULT:	DB	02
   119                              <1>                 ;DW      MD_TBL3
   120 00005BDB [085C0000]          <1> 		dd      MD_TBL3
   121 00005BDF 03                  <1> 		DB	03
   122                              <1>                 ;DW      MD_TBL4
   123 00005BE0 [155C0000]          <1> 		dd      MD_TBL4
   124 00005BE4 84                  <1> 		DB	04+BIT7ON
   125                              <1>                 ;DW      MD_TBL5
   126 00005BE5 [225C0000]          <1> 		dd      MD_TBL5
   127 00005BE9 04                  <1> 		DB	04
   128                              <1>                 ;DW      MD_TBL6
   129 00005BEA [2F5C0000]          <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 00005BEE DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   141 00005BEF 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   142 00005BF0 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   143 00005BF1 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   144 00005BF2 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   145 00005BF3 2A                  <1> 	DB	02AH		; GAP LENGTH
   146 00005BF4 FF                  <1> 	DB	0FFH		; DTL
   147 00005BF5 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   148 00005BF6 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   149 00005BF7 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   150 00005BF8 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   151 00005BF9 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   152 00005BFA 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 00005BFB DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   158 00005BFC 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   159 00005BFD 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   160 00005BFE 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   161 00005BFF 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   162 00005C00 2A                  <1> 	DB	02AH		; GAP LENGTH
   163 00005C01 FF                  <1> 	DB	0FFH		; DTL
   164 00005C02 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   165 00005C03 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   166 00005C04 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   167 00005C05 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   168 00005C06 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   169 00005C07 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 00005C08 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   175 00005C09 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   176 00005C0A 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   177 00005C0B 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   178 00005C0C 0F                  <1> 	DB	15		; EOT (LAST SECTOR ON TRACK)
   179 00005C0D 1B                  <1> 	DB	01BH		; GAP LENGTH
   180 00005C0E FF                  <1> 	DB	0FFH		; DTL
   181 00005C0F 54                  <1> 	DB	054H		; GAP LENGTH FOR FORMAT
   182 00005C10 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   183 00005C11 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   184 00005C12 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   185 00005C13 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   186 00005C14 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 00005C15 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   192 00005C16 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   193 00005C17 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   194 00005C18 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   195 00005C19 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   196 00005C1A 2A                  <1> 	DB	02AH		; GAP LENGTH
   197 00005C1B FF                  <1> 	DB	0FFH		; DTL
   198 00005C1C 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   199 00005C1D F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   200 00005C1E 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   201 00005C1F 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   202 00005C20 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   203 00005C21 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 00005C22 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   209 00005C23 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   210 00005C24 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   211 00005C25 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   212 00005C26 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   213 00005C27 2A                  <1> 	DB	02AH		; GAP LENGTH
   214 00005C28 FF                  <1> 	DB	0FFH		; DTL
   215 00005C29 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   216 00005C2A F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   217 00005C2B 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   218 00005C2C 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   219 00005C2D 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   220 00005C2E 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 00005C2F AF                  <1> 	DB	10101111B	; SRT=A, HD UNLOAD=0F - 1ST SPECIFY BYTE
   226 00005C30 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   227 00005C31 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   228 00005C32 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   229 00005C33 12                  <1> 	DB	18		; EOT (LAST SECTOR ON TRACK)
   230 00005C34 1B                  <1> 	DB	01BH		; GAP LENGTH
   231 00005C35 FF                  <1> 	DB	0FFH		; DTL
   232 00005C36 6C                  <1> 	DB	06CH		; GAP LENGTH FOR FORMAT
   233 00005C37 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   234 00005C38 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   235 00005C39 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   236 00005C3A 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   237 00005C3B 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 00005C3C E0                  <1> 	db	NO_ERR
   280 00005C3D 024001BB            <1> 	db	BAD_ADDR_MARK,BAD_SEEK,BAD_CMD,UNDEF_ERR
   281 00005C41 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 00005C45 00                  <1> cfd:		db 0			; current floppy drive (for GET_PARM)
   286                              <1> ; 17/12/2014				; instead of 'DISK_POINTER'
   287 00005C46 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 00005C47 90                  <1> align 2
   293                              <1> 
   294 00005C48 F001                <1> HF_PORT:	dw 	1F0h  ; Default = 1F0h
   295                              <1> 			      ; (170h)
   296 00005C4A F603                <1> HF_REG_PORT:	dw	3F6h  ; HF_PORT + 206h
   297                              <1> 
   298                              <1> ; 05/01/2015 
   299 00005C4C 00                  <1> hf_m_s:         db      0     ; (0 = Master, 1 = Slave)
   300                              <1> 
   301                              <1> ; *****************************************************************************
  2248                                  
  2249 00005C4D 90                      Align 2
  2250                                  
  2251                                  ; 04/11/2014 (Retro UNIX 386 v1)
  2252 00005C4E 0000                    mem_1m_1k:   dw 0  ; Number of contiguous KB between
  2253                                                       ; 1 and 16 MB, max. 3C00h = 15 MB.
  2254 00005C50 0000                    mem_16m_64k: dw 0  ; Number of contiguous 64 KB blocks
  2255                                  		   ; between 16 MB and 4 GB.
  2256                                  
  2257                                  ; 12/11/2014 (Retro UNIX 386 v1)
  2258 00005C52 00                      boot_drv:    db 0 ; boot drive number (physical)
  2259                                  ; 24/11/2014
  2260 00005C53 00                      drv:	     db 0 
  2261 00005C54 00                      last_drv:    db 0 ; last hdd
  2262 00005C55 00                      hdc:         db 0  ; number of hard disk drives
  2263                                  		     ; (present/detected)
  2264                                  
  2265                                  ; 24/11/2014 (Retro UNIX 386 v1)
  2266                                  ; Physical drive type & flags
  2267 00005C56 00                      fd0_type:    db 0  ; floppy drive type
  2268 00005C57 00                      fd1_type:    db 0  ; 4 = 1.44 Mb, 80 track, 3.5" (18 spt)
  2269                                  		     ; 6 = 2.88 Mb, 80 track, 3.5" (36 spt)
  2270                                  		     ; 3 = 720 Kb, 80 track, 3.5" (9 spt)
  2271                                  		     ; 2 = 1.2 Mb, 80 track, 5.25" (15 spt)
  2272                                  		     ; 1 = 360 Kb, 40 track, 5.25" (9 spt)		
  2273 00005C58 00                      hd0_type:    db 0  ; EDD status for hd0 (bit 7 = present flag)
  2274 00005C59 00                      hd1_type:    db 0  ; EDD status for hd1 (bit 7 = present flag)
  2275 00005C5A 00                      hd2_type:    db 0  ; EDD status for hd2 (bit 7 = present flag)
  2276 00005C5B 00                      hd3_type:    db 0  ; EDD status for hd3 (bit 7 = present flag)
  2277                                  		     ; bit 0 - Fixed disk access subset supported
  2278                                  		     ; bit 1 - Drive locking and ejecting
  2279                                  		     ; bit 2 - Enhanced disk drive support
  2280                                  		     ; bit 3 = Reserved (64 bit EDD support)
  2281                                  		     ; (If bit 0 is '1' Retro UNIX 386 v1
  2282                                  		     ; will interpret it as 'LBA ready'!)
  2283                                  
  2284                                  ; 11/03/2015 - 10/07/2015
  2285 00005C5C 000000000000000000-     drv.cylinders: dw 0,0,0,0,0,0,0
  2285 00005C65 0000000000         
  2286 00005C6A 000000000000000000-     drv.heads:     dw 0,0,0,0,0,0,0
  2286 00005C73 0000000000         
  2287 00005C78 000000000000000000-     drv.spt:       dw 0,0,0,0,0,0,0
  2287 00005C81 0000000000         
  2288 00005C86 000000000000000000-     drv.size:      dd 0,0,0,0,0,0,0
  2288 00005C8F 000000000000000000-
  2288 00005C98 000000000000000000-
  2288 00005CA1 00                 
  2289 00005CA2 00000000000000          drv.status:    db 0,0,0,0,0,0,0
  2290 00005CA9 00000000000000          drv.error:     db 0,0,0,0,0,0,0	
  2291                                  
  2292                                  Align 2
  2293                                  
  2294                                  ;;; 11/03/2015
  2295                                  %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 00005CB0 524F50514B          <1> K30:	db	82,79,80,81,75
    36 00005CB5 4C4D474849          <1> 	db	76,77,71,72,73		; 10 NUMBER ON KEYPAD
    37                              <1> ;-----	SUPER-SHIFT-TABLE 
    38 00005CBA 101112131415        <1> 	db	16,17,18,19,20,21	; A-Z TYPEWRITER CHARS
    39 00005CC0 161718191E1F        <1> 	db	22,23,24,25,30,31
    40 00005CC6 202122232425        <1> 	db	32,33,34,35,36,37
    41 00005CCC 262C2D2E2F30        <1> 	db	38,44,45,46,47,48
    42 00005CD2 3132                <1> 	db	49,50
    43                              <1> 
    44                              <1> ;-----	TABLE OF SHIFT KEYS AND MASK VALUES
    45                              <1> ;-----	KEY_TABLE 
    46 00005CD4 52                  <1> _K6:    db      INS_KEY                 ; INSERT KEY
    47 00005CD5 3A4546381D          <1> 	db	CAPS_KEY,NUM_KEY,SCROLL_KEY,ALT_KEY,CTL_KEY
    48 00005CDA 2A36                <1>         db      LEFT_KEY,RIGHT_KEY
    49                              <1> _K6L    equ     $-_K6
    50                              <1> 
    51                              <1> ;-----	MASK_TABLE
    52 00005CDC 80                  <1> _K7:    db      INS_SHIFT               ; INSERT MODE SHIFT
    53 00005CDD 4020100804          <1> 	db	CAPS_SHIFT,NUM_SHIFT,SCROLL_SHIFT,ALT_SHIFT,CTL_SHIFT
    54 00005CE2 0201                <1> 	db	LEFT_SHIFT,RIGHT_SHIFT
    55                              <1> 
    56                              <1> ;-----	TABLES FOR CTRL CASE		;---- CHARACTERS ------
    57 00005CE4 1BFF00FFFFFF        <1> _K8:	db	27,-1,0,-1,-1,-1	; Esc, 1, 2, 3, 4, 5
    58 00005CEA 1EFFFFFFFF1F        <1> 	db 	30,-1,-1,-1,-1,31	; 6, 7, 8, 9, 0, -
    59 00005CF0 FF7FFF111705        <1> 	db	-1,127,-1,17,23,5	; =, Bksp, Tab, Q, W, E
    60 00005CF6 12141915090F        <1> 	db	18,20,25,21,9,15	; R, T, Y, U, I, O
    61 00005CFC 101B1D0AFF01        <1> 	db	16,27,29,10,-1,1	; P, [, ], Enter, Ctrl, A
    62 00005D02 13040607080A        <1> 	db	19,4,6,7,8,10		; S, D, F, G, H, J
    63 00005D08 0B0CFFFFFFFF        <1> 	db	11,12,-1,-1,-1,-1	; K, L, :, ', `, LShift
    64 00005D0E 1C1A18031602        <1> 	db	28,26,24,3,22,2		; Bkslash, Z, X, C, V, B
    65 00005D14 0E0DFFFFFFFF        <1> 	db	14,13,-1,-1,-1,-1	; N, M, ,, ., /, RShift
    66 00005D1A 96FF20FF            <1> 	db	150,-1,' ',-1		; *, ALT, Spc, CL
    67                              <1> 	;				;----- FUNCTIONS ------		
    68 00005D1E 5E5F60616263        <1> 	db 	94,95,96,97,98,99	; F1 - F6
    69 00005D24 64656667FFFF        <1> 	db	100,101,102,103,-1,-1	; F7 - F10, NL, SL
    70 00005D2A 778D848E738F        <1> 	db	119,141,132,142,115,143	; Home, Up, PgUp, -, Left, Pad5
    71 00005D30 749075917692        <1> 	db 	116,144,117,145,118,146 ; Right, +, End, Down, PgDn, Ins
    72 00005D36 93FFFFFF898A        <1> 	db	147,-1,-1,-1,137,138	; Del, SysReq, Undef, WT, F11, F12
    73                              <1> 
    74                              <1> ;-----	TABLES FOR LOWER CASE ----------
    75 00005D3C 1B3132333435363738- <1> K10:	db 	27,'1234567890-=',8,9
    75 00005D45 39302D3D0809        <1>
    76 00005D4B 71776572747975696F- <1> 	db 	'qwertyuiop[]',13,-1,'asdfghjkl;',39
    76 00005D54 705B5D0DFF61736466- <1>
    76 00005D5D 67686A6B6C3B27      <1>
    77 00005D64 60FF5C7A786376626E- <1> 	db	96,-1,92,'zxcvbnm,./',-1,'*',-1,' ',-1
    77 00005D6D 6D2C2E2FFF2AFF20FF  <1>
    78                              <1> ;-----	LC TABLE SCAN
    79 00005D76 3B3C3D3E3F          <1> 	db	59,60,61,62,63		; BASE STATE OF F1 - F10
    80 00005D7B 4041424344          <1> 	db	64,65,66,67,68
    81 00005D80 FFFF                <1> 	db	-1,-1			; NL, SL
    82                              <1> 
    83                              <1> ;-----	KEYPAD TABLE
    84 00005D82 474849FF4BFF        <1> K15:	db	71,72,73,-1,75,-1	; BASE STATE OF KEYPAD KEYS
    85 00005D88 4DFF4F50515253      <1> 	db	77,-1,79,80,81,82,83
    86 00005D8F FFFF5C8586          <1> 	db	-1,-1,92,133,134	; SysRq, Undef, WT, F11, F12
    87                              <1> 
    88                              <1> ;-----	TABLES FOR UPPER CASE ----------
    89 00005D94 1B21402324255E262A- <1> K11:	db 	27,'!@#$%',94,'&*()_+',8,0
    89 00005D9D 28295F2B0800        <1>
    90 00005DA3 51574552545955494F- <1> 	db 	'QWERTYUIOP{}',13,-1,'ASDFGHJKL:"'
    90 00005DAC 507B7D0DFF41534446- <1>
    90 00005DB5 47484A4B4C3A22      <1>
    91 00005DBC 7EFF7C5A584356424E- <1> 	db	126,-1,'|ZXCVBNM<>?',-1,'*',-1,' ',-1
    91 00005DC5 4D3C3E3FFF2AFF20FF  <1>
    92                              <1> ;-----	UC TABLE SCAN
    93 00005DCE 5455565758          <1> K12:	db	84,85,86,87,88		; SHIFTED STATE OF F1 - F10
    94 00005DD3 595A5B5C5D          <1> 	db	89,90,91,92,93
    95 00005DD8 FFFF                <1> 	db	-1,-1			; NL, SL
    96                              <1> 
    97                              <1> ;-----	NUM STATE TABLE
    98 00005DDA 3738392D3435362B31- <1> K14:	db 	'789-456+1230.'		; NUMLOCK STATE OF KEYPAD KEYS
    98 00005DE3 3233302E            <1>
    99                              <1> 	;
   100 00005DE7 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 00005DEC 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 00005DED 00                  <1> KB_FLAG		db	0		; KEYBOARD SHIFT STATE AND STATUS FLAGS
   118 00005DEE 00                  <1> KB_FLAG_1	db	0		; SECOND BYTE OF KEYBOARD STATUS
   119 00005DEF 00                  <1> KB_FLAG_2	db	0		; KEYBOARD LED FLAGS
   120 00005DF0 00                  <1> KB_FLAG_3	db	0		; KEYBOARD MODE STATE AND TYPE FLAGS
   121 00005DF1 00                  <1> ALT_INPUT	db	0		; STORAGE FOR ALTERNATE KEY PAD ENTRY
   122 00005DF2 [025E0000]          <1> BUFFER_START	dd	KB_BUFFER 	; OFFSET OF KEYBOARD BUFFER START
   123 00005DF6 [225E0000]          <1> BUFFER_END	dd	KB_BUFFER + 32	; OFFSET OF END OF BUFFER
   124 00005DFA [025E0000]          <1> BUFFER_HEAD	dd	KB_BUFFER 	; POINTER TO HEAD OF KEYBOARD BUFFER
   125 00005DFE [025E0000]          <1> BUFFER_TAIL	dd	KB_BUFFER 	; POINTER TO TAIL OF KEYBOARD BUFFER
   126                              <1> ; ------	HEAD = TAIL	INDICATES THAT THE BUFFER IS EMPTY
   127 00005E02 0000<rept>          <1> KB_BUFFER	times	16 dw 0		; ROOM FOR 16 SCAN CODE ENTRIES
   128                              <1> 
   129                              <1> ; /// End Of KEYBOARD DATA ///
  2296                                  %include 'vidata.s'	; VIDEO (BIOS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - vidata.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 31/07/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     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> ; 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 00005E22 03                  <1> CRT_MODE:	db	3	; CURRENT DISPLAY MODE (TYPE)
    29 00005E23 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 00005E24 50                  <1> CRT_COLS:	db	80	; Number of columns
    52                              <1> 
    53                              <1> ; 01/07/2016
    54 00005E25 00                  <1> CRT_PALETTE:	db 	0	; Current palette setting
    55                              <1> 
    56                              <1> ; 03/07/2016
    57 00005E26 10                  <1> CHAR_HEIGHT:	db	16	; Default character height
    58 00005E27 60                  <1> VGA_VIDEO_CTL:	db	60h	; ROM BIOS DATA AREA Offset 87h
    59 00005E28 F9                  <1> VGA_SWITCHES:	db 	0F9h	; Feature Bit Switches (the basic screen)
    60 00005E29 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 00005E2A 19                  <1> VGA_ROWS:	db	25
    73                              <1> 
    74                              <1> ; 16/01/2016
    75                              <1> chr_attrib:  ; Character color/attributes for viode pages (0 to 7)
    76 00005E2B 0707070707070707    <1> 	db	07h, 07h, 07h, 07h, 07h, 07h, 07h, 07h
    77                              <1> ; 30/01/2016
    78                              <1> vmode:
    79 00005E33 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 00005E3B 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 00005E3D 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 00005E3E 0302010007040506    <1> 	db 	03h, 02h, 01h, 00h, 07h, 04h, 05h, 06h
    96                              <1> vga_g_modes: ; 31/07/2016
    97 00005E46 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 00005E4E [AE5E0000]          <1> 	dd	vga_mode_03h
   104 00005E52 [AE5E0000]          <1> 	dd	vga_mode_03h ; mode 02h -> mode 03h 
   105 00005E56 [EE5E0000]          <1> 	dd	vga_mode_01h
   106 00005E5A [EE5E0000]          <1> 	dd	vga_mode_01h ; mode 00h -> mode 01h
   107                              <1> 	;dd	vga_mode_07h
   108 00005E5E [AE5E0000]          <1> 	dd	vga_mode_03h ; mode 07h -> mode 03h
   109 00005E62 [2E5F0000]          <1> 	dd	vga_mode_04h
   110 00005E66 [2E5F0000]          <1> 	dd	vga_mode_04h ; mode 05h -> mode 04h	
   111 00005E6A [6E5F0000]          <1> 	dd	vga_mode_06h
   112 00005E6E [AE5F0000]          <1> 	dd	vga_mode_13h
   113 00005E72 [EE5F0000]          <1> 	dd	vga_mode_F0h
   114 00005E76 [2E600000]          <1> 	dd	vga_mode_12h
   115 00005E7A [6E600000]          <1> 	dd	vga_mode_6Ah
   116 00005E7E [AE600000]          <1> 	dd	vga_mode_0Dh
   117 00005E82 [EE600000]          <1> 	dd	vga_mode_0Eh
   118 00005E86 [2E610000]          <1> 	dd	vga_mode_10h
   119 00005E8A [6E610000]          <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 00005E8E 0000000000020202    <1> 	db	CTEXT, CTEXT, CTEXT, CTEXT, MTEXT, CGA, CGA, CGA
   132                              <1> vga_g_memmodel: ; 31/07/2016
   133 00005E96 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 00005E9E 020202020001010103- <1> 	db	2, 2, 2, 2, 0, 1, 1, 1, 3, 3, 2, 2, 1, 1, 2, 2
   139 00005EA7 03020201010202      <1>
   140                              <1> 
   141                              <1> vga_params:
   142                              <1> 	; 25/07/2016 
   143                              <1> 	; 19/07/2016
   144                              <1> 	; 03/07/2016
   145                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
   146                              <1> 	; vgabios-0.7a (2011)
   147                              <1> 	; by the LGPL VGABios Developers Team (2001-2008)
   148                              <1> 	; 'vgatables.h'
   149                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
   150                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
   151                              <1> 	;
   152                              <1> vga_mode_03h:  ; mode 03h, 80*25 text, CGA colors
   153 00005EAE 5018100010          <1>  	db	80, 24, 16, 00h, 10h ; tw, th-1, ch, slength (5)
   154 00005EB3 00030002            <1>  	db	00h, 03h, 00h, 02h ; sequ regs (4)
   155 00005EB7 67                  <1>  	db	67h	; misc reg (1)
   156 00005EB8 5F4F50825581BF1F    <1>  	db	5Fh, 4Fh, 50h, 82h, 55h, 81h, 0BFh, 1Fh
   157 00005EC0 004F                <1>  	db	00h, 4Fh
   158                              <1> vga_p_cm_pos equ $ - vga_mode_03h
   159 00005EC2 0D0E00000000        <1> 	db	0Dh, 0Eh, 00h, 00h, 00h, 00h
   160 00005EC8 9C8E8F281F96B9A3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 1Fh, 96h, 0B9h, 0A3h
   161 00005ED0 FF                  <1> 	db	0FFh	; crtc_regs (25)
   162 00005ED1 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   163 00005ED9 38393A3B3C3D3E3F    <1>  	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   164 00005EE1 0C000F08            <1>  	db	0Ch, 00h, 0Fh, 08h  ; actl regs (20)
   165 00005EE5 0000000000100E0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 10h, 0Eh, 0Fh, 0FFh ; grdc regs (9)
   166                              <1> vga_mode_01h:	; mode 01h, 40*25 text, CGA colors
   167 00005EEE 2818100008          <1> 	db	40, 24, 16, 00h, 08h ; tw, th-1, ch, slength
   168 00005EF3 08030002            <1> 	db	08h, 03h, 00h, 02h  ; sequ regs
   169 00005EF7 67                  <1> 	db	67h	; misc reg
   170 00005EF8 2D2728902BA0BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 0A0h, 0BFh, 1Fh
   171 00005F00 004F0D0E00000000    <1> 	db	00h, 4Fh, 0Dh, 0Eh, 00h, 00h, 00h, 00h
   172 00005F08 9C8E8F141F96B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 1Fh, 96h, 0B9h, 0A3h
   173 00005F10 FF                  <1> 	db	0FFh	; crtc_regs
   174 00005F11 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   175 00005F19 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   176 00005F21 0C000F08            <1> 	db	0Ch, 00h, 0Fh, 08h  ; actl regs
   177 00005F25 0000000000100E0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 10h, 0Eh, 0Fh, 0FFh ; grdc regs
   178                              <1> ;vga_mode_07h:	; mode 07h, 80*25 text, mono color
   179                              <1> ;	db	80, 24, 16, 00h, 10h  ; tw, th-1, ch, slength
   180                              <1> ;	db	00h, 03h, 00h, 02h ; sequ regs
   181                              <1> ;	db	66h	; misc reg
   182                              <1> ;	db	5Fh, 4Fh, 50h, 82h, 55h, 81h, 0BFh, 1Fh
   183                              <1> ;	db	00h, 4Fh, 0Dh, 0Eh, 00h, 00h, 00h, 00h
   184                              <1> ;	db	9Ch, 8Eh, 8Fh, 28h, 0Fh, 96h, 0B9h, 0A3h
   185                              <1> ;	db	0FFh	; crtc regs
   186                              <1> ;	db	00h, 08h, 08h, 08h, 08h, 08h, 08h, 08h
   187                              <1> ;	db	10h, 18h, 18h, 18h, 18h, 18h, 18h, 18h
   188                              <1> ;	db	0Eh, 00h, 0Fh, 08h  ; actl regs
   189                              <1> ;	db	00h, 00h, 00h, 00h, 00h, 10h, 0Ah, 0Fh, 0FFh ; grdc regs
   190                              <1> vga_mode_04h:	; 320*200 graphics, 4 colors, CGA
   191 00005F2E 2818080008          <1> 	db	40, 24, 8, 00h, 08h   ; tw, th-1, ch, slength
   192 00005F33 09030002            <1> 	db	09h, 03h, 00h, 02h ; sequ regs
   193 00005F37 63                  <1> 	db	63h	; misc reg
   194 00005F38 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   195 00005F40 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   196 00005F48 9C8E8F140096B9A2    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0A2h
   197 00005F50 FF                  <1> 	db	0FFh	; crtc_regs
   198 00005F51 0013151702040607    <1> 	db	00h, 13h, 15h, 17h, 02h, 04h, 06h, 07h
   199 00005F59 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   200 00005F61 01000300            <1> 	db	01h, 00h, 03h, 00h ; actl regs
   201 00005F65 0000000000300F0FFF  <1> 	db 	00h, 00h, 00h, 00h, 00h, 30h, 0Fh, 0Fh, 0FFh ; grdc regs
   202                              <1> vga_mode_06h:	; 640*200 graphics, 2 colors, CGA
   203 00005F6E 5018080010          <1> 	db	80, 24, 8, 00h, 10h   ;	tw, th-1, ch, slength
   204 00005F73 01010006            <1> 	db	01h, 01h, 00h, 06h ; sequ regs
   205 00005F77 63                  <1> 	db	63h	; misc reg
   206 00005F78 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   207 00005F80 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   208 00005F88 9C8E8F280096B9C2    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0C2h
   209 00005F90 FF                  <1> 	db	0FFh	; crtc regs
   210 00005F91 0017171717171717    <1> 	db	00h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   211 00005F99 1717171717171717    <1> 	db	17h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   212 00005FA1 01000100            <1> 	db	01h, 00h, 01, 00h  ; actl regs
   213 00005FA5 0000000000000D0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 0Dh, 0Fh, 0FFh ; grdc regs
   214                              <1> vga_mode_13h:  ; mode 13h, 300*200, 256 colors, linear
   215 00005FAE 2818080000          <1> 	db 	40, 24, 8, 0, 0	; tw, th-1, ch, slength (5)
   216 00005FB3 010F000E            <1> 	db	01h, 0Fh, 00h, 0Eh ; sequ regs (4)
   217 00005FB7 63                  <1> 	db	63h	; misc reg (1)
   218 00005FB8 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh 
   219 00005FC0 0041000000000000    <1>  	db 	00h, 41h, 00h, 00h, 00h, 00h, 00h, 00h
   220 00005FC8 9C8E8F284096B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 40h, 96h, 0B9h, 0A3h
   221 00005FD0 FF                  <1> 	db	0FFh	; crtc regs (25)
   222 00005FD1 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   223 00005FD9 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   224 00005FE1 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs (20)
   225 00005FE5 000000000040050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 40h, 05h, 0Fh, 0FFh ; grdc regs (9)
   226                              <1> vga_mode_setl equ $ - vga_mode_13h  ; = 64
   227                              <1> vga_mode_F0h:  ; mode X ; 320*240, 256 colors, planar
   228 00005FEE 2818080000          <1> 	db 	40, 24, 8, 0, 0	; tw, th-1, ch, slength
   229 00005FF3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   230 00005FF7 E3                  <1> 	db	0E3h	; misc reg
   231 00005FF8 5F4F508254800D3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Dh, 3Eh 
   232 00006000 0041000000000000    <1>  	db 	00h, 41h, 00h, 00h, 00h, 00h, 00h, 00h
   233 00006008 EAACDF2800E706E3    <1> 	db	0EAh, 0ACh, 0DFh, 28h, 00h, 0E7h, 06h, 0E3h
   234 00006010 FF                  <1> 	db	0FFh	; crtc regs (25)
   235 00006011 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   236 00006019 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   237 00006021 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs
   238 00006025 000000000040050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 40h, 05h, 0Fh, 0FFh ; grdc regs
   239                              <1> vga_mode_12h:  ; mode 12h, 640*480, 16 colors, planar
   240 0000602E 501D100000          <1>  	db 	80, 29, 16, 0, 0 ; tw, th-1, ch, slength
   241 00006033 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   242 00006037 E3                  <1> 	db 	0E3h	; misc reg
   243 00006038 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   244 00006040 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   245 00006048 EA8CDF2800E704E3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   246 00006050 FF                  <1> 	db	0FFh	; crtc regs
   247 00006051 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   248 00006059 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   249 00006061 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   250 00006065 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   251                              <1> vga_mode_6Ah:  ; mode 6Ah, 800*600, 16 colors, planar
   252 0000606E 6424100000          <1>  	db 	100, 36, 16, 0, 0 ; tw, th-1, ch, slength
   253 00006073 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   254 00006077 E3                  <1> 	db 	0E3h	; misc reg
   255 00006078 7F6363836B1B72F0    <1> 	db	7Fh, 63h, 63h, 83h, 6Bh, 1Bh, 72h, 0F0h
   256 00006080 0060000000000000    <1> 	db	00h, 60h, 00h, 00h, 00h, 00h, 00h, 00h
   257 00006088 598D5732005773E3    <1>  	db	59h, 8Dh, 57h, 32h, 00h, 57h, 73h, 0E3h
   258 00006090 FF                  <1> 	db	0FFh	; crtc regs
   259 00006091 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   260 00006099 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   261 000060A1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   262 000060A5 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   263                              <1> vga_mode_0Dh:  ; mode 0Dh, 320*200, 16 colors, planar
   264 000060AE 2818080020          <1>  	db 	40, 24, 8, 0, 20h ; tw, th-1, ch, slength
   265 000060B3 090F0006            <1> 	db	09h, 0Fh, 00h, 06h ; sequ regs
   266 000060B7 63                  <1> 	db 	63h	; misc reg
   267 000060B8 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   268 000060C0 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   269 000060C8 9C8E8F140096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0E3h
   270 000060D0 FF                  <1> 	db	0FFh	; crtc regs
   271 000060D1 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   272 000060D9 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   273 000060E1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   274 000060E5 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   275                              <1> vga_mode_0Eh:  ; mode 0Eh, 640*200, 16 colors, planar
   276 000060EE 5018080040          <1>  	db 	80, 24, 8, 0, 40h ; tw, th-1, ch, slength
   277 000060F3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   278 000060F7 63                  <1> 	db 	63h	; misc reg
   279 000060F8 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   280 00006100 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   281 00006108 9C8E8F280096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0E3h
   282 00006110 FF                  <1> 	db	0FFh	; crtc regs
   283 00006111 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   284 00006119 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   285 00006121 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   286 00006125 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   287                              <1> vga_mode_10h: ; mode 10h, 640*350, 16 colors, planar
   288 0000612E 50180E0080          <1>  	db 	80, 24, 14, 0, 80h ; tw, th-1, ch, slength
   289 00006133 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   290 00006137 A3                  <1> 	db 	0A3h	; misc reg
   291 00006138 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   292 00006140 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   293 00006148 83855D280F63BAE3    <1>  	db	83h, 85h, 5Dh, 28h, 0Fh, 63h, 0BAh, 0E3h
   294 00006150 FF                  <1> 	db	0FFh	; crtc regs
   295 00006151 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   296 00006159 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   297 00006161 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   298 00006165 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   299                              <1> vga_mode_11h: ; mode 11h, 640*480, mono color, planar
   300 0000616E 501D100000          <1>  	db 	80, 29, 16, 0, 0   ; tw, th-1, ch, slength
   301 00006173 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   302 00006177 E3                  <1> 	db 	0E3h	; misc reg
   303 00006178 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   304 00006180 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   305 00006188 EA8CDF2800E704E3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   306 00006190 FF                  <1> 	db	0FFh	; crtc regs
   307 00006191 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   308 00006199 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   309 000061A1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   310 000061A5 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   311                              <1> end_of_vga_params:
   312                              <1> 
   313                              <1> ; /// End Of VIDEO DATA ///
  2297                                  ;%include 'diskdata.s'	; DISK (BIOS) DATA (initialized)
  2298                                  ;;;
  2299                                  
  2300                                  Align 2
  2301                                  
  2302                                  %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: 10/04/2017
     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> ; 19/02/2017
    79                              <1> ; 15/10/2016
    80                              <1> ; 20/05/2016
    81                              <1> ; 19/05/2016
    82                              <1> ; 18/05/2016
    83                              <1> ; 29/04/2016 
    84                              <1> ; TRDOS 386 (TRDOS v2.0) system calls - temporary List 
    85                              <1> ; 14/07/2013 - 21/09/2015 (Retro UNIX 8086 & 386 system calls) 
    86                              <1> ; UNIX v1 system calls
    87                              <1> ;_rele	equ 0
    88                              <1> _ver 	equ 0 ; Get TRDOS version (v2.0)
    89                              <1> _exit 	equ 1
    90                              <1> _fork 	equ 2
    91                              <1> _read 	equ 3
    92                              <1> _write	equ 4
    93                              <1> _open	equ 5
    94                              <1> _close 	equ 6
    95                              <1> _wait 	equ 7
    96                              <1> _creat 	equ 8
    97                              <1> _link 	equ 9
    98                              <1> _unlink	equ 10
    99                              <1> _exec	equ 11
   100                              <1> _chdir	equ 12
   101                              <1> _time 	equ 13
   102                              <1> _mkdir 	equ 14
   103                              <1> _chmod	equ 15
   104                              <1> _chown	equ 16
   105                              <1> _break	equ 17
   106                              <1> _stat	equ 18
   107                              <1> _seek	equ 19
   108                              <1> _tell 	equ 20
   109                              <1> _mount	equ 21
   110                              <1> _umount	equ 22
   111                              <1> _setuid	equ 23
   112                              <1> _getuid	equ 24
   113                              <1> _stime	equ 25
   114                              <1> _quit	equ 26	
   115                              <1> _intr	equ 27
   116                              <1> _fstat	equ 28
   117                              <1> _emt 	equ 29
   118                              <1> _mdate 	equ 30
   119                              <1> ;_stty 	equ 31
   120                              <1> _video  equ 31 ; TRDOS 386 Video Functions (16/05/2016)
   121                              <1> ;_gtty	equ 32
   122                              <1> _audio	equ 32 ; TRDOS 386 Video Functions (16/05/2016)
   123                              <1> ;_ilgins equ 33
   124                              <1> _timer	equ 33 ; TRDOS 386 Timer Functions (18/05/2016)
   125                              <1> _sleep	equ 34 ; Retro UNIX 8086 v1 feature only !
   126                              <1> _msg	equ 35 ; Retro UNIX 386 v1 feature only !
   127                              <1> _geterr	equ 36 ; Retro UNIX 386 v1 feature only !
   128                              <1> _fpsave equ 37 ; TRDOS 386 FPU state option (28/02/2017)
   129                              <1> _pri 	equ 38 ; change priority - TRDOS 386 (20/05/2016)
   130                              <1> _rele	equ 39 ; TRDOS 386 (19/05/2016)
   131                              <1> _fff	equ 40 ; Find First File - TRDOS 386 (15/10/2016)
   132                              <1> _fnf	equ 41 ; Find Next File - TRDOS 386 (15/10/2016)
   133                              <1> _alloc	equ 42 ; Allocate memory - TRDOS 386 (19/02/2017)
   134                              <1> 	       ; TRDOS 386 (19/02/2017) DMA buff fuctions		
   135                              <1> _dalloc equ 43 ; Deallocate mem - TRDOS 386 (19/02/2017)
   136                              <1> _calbac equ 44 ; Set IRQ callback - TRDOS 386 (20/02/2017)  				
   137                              <1> 
   138                              <1> %macro sys 1-4
   139                              <1>     ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)	
   140                              <1>     ; 03/09/2015	
   141                              <1>     ; 13/04/2015
   142                              <1>     ; Retro UNIX 386 v1 system call.		
   143                              <1>     %if %0 >= 2   
   144                              <1>         mov ebx, %2
   145                              <1>         %if %0 >= 3    
   146                              <1>             mov ecx, %3
   147                              <1>             %if %0 = 4
   148                              <1>                mov edx, %4   
   149                              <1>             %endif
   150                              <1>         %endif
   151                              <1>     %endif
   152                              <1>     mov eax, %1
   153                              <1>     ;int 30h
   154                              <1>     int 40h ; TRDOS 386 (TRDOS v2.0)		   
   155                              <1> %endmacro
   156                              <1> 
   157                              <1> ; TRDOS 386 system calls, interrupt number
   158                              <1> ; 25/12/2016
   159                              <1> SYSCALL_INT_NUM   equ '40' ; '40h'
   160                              <1> 
   161                              <1> ; 13/05/2015 - ERROR CODES
   162                              <1> ERR_FILE_NOT_OPEN  equ 10 ; 'file not open !' error
   163                              <1> ERR_FILE_ACCESS    equ 11 ; 'permission denied !' error
   164                              <1> ; 14/05/2015
   165                              <1> ERR_DIR_ACCESS     equ 11 ; 'permission denied !' error
   166                              <1> ERR_FILE_NOT_FOUND equ 12 ; 'file not found !' error
   167                              <1> ERR_TOO_MANY_FILES equ 13 ; 'too many open files !' error
   168                              <1> ERR_DIR_EXISTS     equ 14 ; 'directory already exists !' error 	
   169                              <1> ; 16/05/2015		
   170                              <1> ERR_DRV_NOT_RDY    equ 15 ; 'drive not ready !' error
   171                              <1> ; 18/05/2015
   172                              <1> ERR_DEV_NOT_RDY    equ 15 ; 'device not ready !' error
   173                              <1> ERR_DEV_ACCESS     equ 11 ; 'permission denied !' error 
   174                              <1> ERR_DEV_NOT_OPEN   equ 10 ; 'device not open !' error	
   175                              <1> ; 07/06/2015
   176                              <1> ERR_FILE_EOF	   equ 16 ; 'end of file !' error
   177                              <1> ERR_DEV_VOL_SIZE   equ 16 ; 'out of volume !' error
   178                              <1> ; 09/06/2015
   179                              <1> ERR_DRV_READ	   equ 17 ; 'disk read error !'
   180                              <1> ERR_DRV_WRITE	   equ 18 ; 'disk write error !'
   181                              <1> ; 16/06/2015
   182                              <1> ERR_NOT_DIR	   equ 19 ; 'not a (valid) directory !' error
   183                              <1> ERR_FILE_SIZE	   equ 20 ; 'file size error !'	
   184                              <1> ; 22/06/2015
   185                              <1> ERR_NOT_SUPERUSER  equ 11 ; 'permission denied !' error
   186                              <1> ERR_NOT_OWNER      equ 11 ; 'permission denied !' error
   187                              <1> ERR_NOT_FILE       equ 11 ; 'permission denied !' error	
   188                              <1> ; 23/06/2015
   189                              <1> ERR_FILE_EXISTS    equ 14 ; 'file already exists !' error
   190                              <1> ERR_DRV_NOT_SAME   equ 21 ; 'not same drive !' error
   191                              <1> ERR_DIR_NOT_FOUND  equ 12 ; 'directory not found !' error
   192                              <1> ERR_NOT_EXECUTABLE equ 22 ; 'not executable file !' error
   193                              <1> ; 27/06/2015
   194                              <1> ERR_INV_PARAMETER  equ 23 ; 'invalid parameter !' error
   195                              <1> ERR_INV_DEV_NAME   equ 24 ; 'invalid device name !' error
   196                              <1> ; 29/06/2015
   197                              <1> ERR_TIME_OUT	   equ 25 ; 'time out !' error			
   198                              <1> ERR_DEV_NOT_RESP   equ 25 ; 'device not responding !' error
   199                              <1> ; 10/10/2016
   200                              <1> ERR_INV_FILE_NAME  equ 26 ; 'invalid file name !' error
   201                              <1> ERR_INV_FLAGS	   equ 23 ; 'invalid flags !' error
   202                              <1> ; For code compatibility with previous version of TRDOS (2011)
   203                              <1> ; (Temporary error codes for current TRDOS 386 -2016- version) 
   204                              <1> ERR_NO_MORE_FILES  equ 12 ; 'no more files !' error
   205                              <1> ERR_PATH_NOT_FOUND equ  3 ; 'path not found !' error 
   206                              <1> 			  ; 'dir not found !' ; TRDOS 8086
   207                              <1> ERR_NOT_FOUND:	   equ  2 ; 'file not found !' ; TRDOS 8086
   208                              <1> ERR_DISK_SPACE	   equ 39 ; 'out of volume !' TRDOS 8086
   209                              <1> 			  ; 'insufficient disk space !' ; 27h
   210                              <1> ERR_DISK_WRITE	   equ 30 ; 'disk write protected !' ; 16/10/2016
   211                              <1> ERR_ACCESS_DENIED  equ  5 ; 'access denied !' ; TRDOS 8086 	
   212                              <1> ; 28/02/2017
   213                              <1> ERR_PERM_DENIED	   equ 11 ; 'permission denied !' error  	
   214                              <1> ; 18/05/2016
   215                              <1> ERR_MISC	   equ 27 ; miscellaneous/other errors
   216                              <1> ; 15/10/2016
   217                              <1> ; TRDOS 8086 -> TRDOS 386 (0Bh -> 28)
   218                              <1> ERR_INV_FORMAT	   equ 28 ; 'invalid format !' error
   219                              <1> ; TRDOS 8086 -> TRDOS 386 (0Dh -> 29)
   220                              <1> ERR_INV_DATA	   equ 29 ; 'invalid data !' error
   221                              <1> ; TRDOS 8086 -> TRDOS 386 (0Eh -> 20)
   222                              <1> ERR_ZERO_LENGTH	   equ 20  ; 'zero length !' error 	
   223                              <1> ; TRDOS 8086 -> TRDOS 386 (15h -> 17, 1Dh -> 18, 1Eh -> 17) 	
   224                              <1> ERR_DRV_NR_READ	   equ 17 ; 'drive not ready or read error !'
   225                              <1> ERR_DRV_NR_WRITE   equ 18 ; 'drive not ready or write error !'		
   226                              <1> ; 15/10/2016
   227                              <1> ERR_INV_PATH_NAME  equ 19 ; 'bad path name !' error
   228                              <1> ERR_BAD_CMD_ARG	   equ  1 ; 'bad command argument !' ; TRDOS 8086
   229                              <1> ERR_INV_FNUMBER	   equ  1 ; 'invalid function number !' ; TRDOS 8086
   230                              <1> ERR_BIG_FILE	   equ  8 ; 'big file & out of memory ! ; TRDOS 8086 	
   231                              <1> ERR_BIG_DATA	   equ  8 ; 'big data & out of memory ! ; TRDOS 8086
   232                              <1> ERR_CLUSTER	   equ 35 ; 'cluster not available !' ; TRDOS 8086
   233                              <1> ERR_OUT_OF_MEMORY  equ  4 ; 'out of memory !'
   234                              <1> 			  ; 'insufficient memory !'
   235                              <1> ERR_P_VIOLATION	   equ	6 ; 'protection violation !'
   236                              <1> ERR_PAGE_FAULT	   equ 224 ;'page fault !' ;0E0h						 
   237                              <1> ERR_SWP_DISK_READ  	   equ 40
   238                              <1> ERR_SWP_DISK_NOT_PRESENT   equ 41
   239                              <1> ERR_SWP_SECTOR_NOT_PRESENT equ 42
   240                              <1> ERR_SWP_NO_FREE_SPACE      equ 43
   241                              <1> ERR_SWP_DISK_WRITE         equ 44
   242                              <1> ERR_SWP_NO_PAGE_TO_SWAP    equ 45
   243                              <1> ; 10/04/2017
   244                              <1> ERR_BUFFER	   equ 46  ; 'buffer error ''	
   245                              <1> 
   246                              <1> ; 26/08/2015
   247                              <1> ; 24/07/2015
   248                              <1> ; 24/06/2015
   249                              <1> MAX_ARG_LEN	   equ 256 ; max. length of sys exec arguments
   250                              <1> ; 01/07/2015
   251                              <1> MAX_MSG_LEN	   equ 255 ; max. msg length for 'sysmsg'
   252                              <1> ;	
   253                              <1> ; 06/10/2016
   254                              <1> OPENFILES	   equ 10  ; max. number of open files (system)
   255                              <1> ; 07/10/2016
   256                              <1> ;NUMOFDEVICES	   equ 20  ; max. num of available devices (sys)
   257                              <1> 			 		
  2303                                  %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
  2304                                  %include 'trdosk1.s' ; 04/01/2016 
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - SYS INIT : trdosk1.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 23/01/2017
     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> 
    16                              <1> sys_init:
    17                              <1> 	; 23/01/2017
    18                              <1> 	; 07/05/2016
    19                              <1> 	; 02/05/2016
    20                              <1> 	; 24/04/2016
    21                              <1> 	; 14/04/2016
    22                              <1> 	; 13/04/2016
    23                              <1> 	; 30/03/2016
    24                              <1> 	; 24/01/2016
    25                              <1> 	; 06/01/2016
    26                              <1> 	; 04/01/2016
    27                              <1> 
    28                              <1> 	; 23/01/2017 - reset timer frequency (to 18.2Hz)
    29 000061AE B036                <1> 	mov	al, 00110110b ; 36h
    30 000061B0 E643                <1>  	out	43h, al
    31 000061B2 31C0                <1> 	xor	eax, eax  ; sub	al, al ; 0
    32 000061B4 E640                <1> 	out	40h, al ; LB
    33 000061B6 E640                <1> 	out	40h, al ; HB
    34                              <1>  	; 
    35                              <1> 	; 30/03/2016
    36                              <1> 	; Clear Logical DOS Disk Description Tables Area
    37                              <1> 	;xor	eax, eax
    38 000061B8 BF00010900          <1> 	mov	edi, Logical_DOSDisks
    39 000061BD B980060000          <1> 	mov	ecx, 6656/4 ; 26*256 = 6656 bytes
    40 000061C2 F3AB                <1> 	rep	stosd ; 1664 times 4 bytes
    41                              <1> 
    42 000061C4 B83F3A2F00          <1> 	mov	eax, '?:/'
    43 000061C9 A3[A7420100]        <1> 	mov	[Current_Dir_Drv], eax
    44                              <1> 
    45                              <1> 	; Logical DRV INIT (only for hard disks)
    46 000061CE E8B3010000          <1> 	call 	ldrv_init  ; trdosk2.s
    47                              <1> 	
    48                              <1> 	; When floppy_drv_init call is disabled
    49                              <1> 	; media changed sign is needed
    50                              <1> 	; for proper drive initialization
    51                              <1>         
    52 000061D3 BE00010900          <1> 	mov 	esi, Logical_DOSDisks
    53 000061D8 B001                <1> 	mov 	al, 1 ; Initialization sign (invalid_fd_parameter)
    54 000061DA 83C67E              <1> 	add 	esi, LD_MediaChanged ; Media Change Status = 1 (init needed)
    55 000061DD 8806                <1> 	mov 	[esi], al ; A:
    56 000061DF 81C600010000        <1> 	add 	esi, 100h 
    57 000061E5 8806                <1> 	mov 	[esi], al ; B: 
    58                              <1>            
    59                              <1> _current_drive_bootdisk:
    60 000061E7 8A15[525C0000]      <1> 	mov 	dl, [boot_drv] ; physical drive number
    61 000061ED 80FAFF              <1> 	cmp 	dl, 0FFh
    62 000061F0 740A                <1> 	je 	short _last_dos_diskno_check
    63                              <1> _boot_drive_check:
    64 000061F2 80FA80              <1> 	cmp 	dl, 80h
    65 000061F5 7218                <1> 	jb 	short _current_drive_a
    66 000061F7 80EA7E              <1> 	sub 	dl, 7Eh ; C = 2 , D = 3
    67 000061FA EB13                <1> 	jmp 	short _current_drive_a 
    68                              <1> 
    69                              <1> _last_dos_diskno_check:
    70 000061FC 8A15[E2FE0000]      <1> 	mov 	dl, [Last_DOS_DiskNo]
    71 00006202 80FA02              <1> 	cmp 	dl, 2
    72 00006205 7706                <1> 	ja 	short _current_drive_c
    73 00006207 7406                <1> 	je 	short _current_drive_a
    74 00006209 30D2                <1> 	xor 	dl, dl ; A:
    75 0000620B EB02                <1> 	jmp 	short _current_drive_a
    76                              <1> 
    77                              <1> _current_drive_c:
    78 0000620D B202                <1> 	mov 	dl, 2 ; C:
    79                              <1> 
    80                              <1> _current_drive_a:
    81 0000620F 8815[535C0000]      <1> 	mov	[drv], dl
    82 00006215 BE[E4FE0000]        <1>         mov     esi, msg_CRLF_temp
    83 0000621A E89E000000          <1> 	call 	print_msg
    84                              <1> 
    85 0000621F 8A15[535C0000]      <1> 	mov	dl, [drv]
    86 00006225 E893090000          <1> 	call 	change_current_drive
    87 0000622A 730C                <1> 	jnc 	short _start_mainprog
    88                              <1> 
    89                              <1> _drv_not_ready_error: 
    90 0000622C BE[9F010100]        <1> 	mov 	esi, msgl_drv_not_ready
    91 00006231 E887000000          <1> 	call 	print_msg
    92 00006236 EB63                <1>         jmp     _end_of_mainprog
    93                              <1> 
    94                              <1> _start_mainprog:
    95                              <1> 	; 07/01/2017
    96                              <1> 	; 07/05/2016
    97                              <1> 	; 02/05/2016
    98                              <1> 	; 24/04/2016
    99                              <1> 	; Retro UNIX 386 v1, 'sys_init' (u0.s)
   100                              <1> 	; 23/06/2015
   101                              <1> 
   102                              <1> 	; 02/05/2016
   103                              <1> 	; 24/04/2016
   104 00006238 66B80100            <1> 	mov	ax, 1
   105 0000623C A2[4F5D0100]        <1> 	mov	[u.uno], al
   106 00006241 66A3[EA5C0100]      <1> 	mov	[mpid], ax
   107 00006247 66A3[BC590100]      <1> 	mov	[p.pid], ax
   108 0000624D A2[4C5A0100]        <1> 	mov	[p.stat], al
   109 00006252 C605[445D0100]04    <1> 	mov	byte [u.quant], time_count  ; 07/01/2017
   110                              <1> 	;
   111 00006259 A1[E0410100]        <1> 	mov	eax, [k_page_dir]
   112 0000625E A3[545D0100]        <1> 	mov	[u.pgdir], eax ; reset
   113                              <1> 	;
   114 00006263 E811E9FFFF          <1> 	call	allocate_page
   115 00006268 0F82A3000000        <1> 	jc	panic
   116 0000626E A3[505D0100]        <1> 	mov	[u.upage], eax ; user structure page	
   117 00006273 A3[5C5A0100]        <1> 	mov	[p.upage], eax
   118 00006278 E876E9FFFF          <1> 	call	clear_page
   119                              <1> 	;
   120                              <1> 	; 24/08/2015
   121 0000627D FE0D[F75C0100]      <1> 	dec 	byte [sysflg] ; FFh = ready for system call
   122                              <1> 			      ; 0 = executing a system call
   123                              <1> 	; 13/04/2016
   124                              <1> 	; Clear Environment Variables Page/Area
   125 00006283 BF00300900          <1> 	mov	edi, Env_Page ; 93000h
   126 00006288 B980000000          <1> 	mov	ecx, Env_Page_Size / 4 	; 512/4  (4096/4)				 	  		 	  
   127 0000628D 31C0                <1> 	xor	eax, eax
   128 0000628F F3AB                <1> 	rep	stosd
   129                              <1> 
   130                              <1> 	; 14/04/2016
   131 00006291 E8C3320000          <1>  	call	mainprog_startup_configuration
   132                              <1> 
   133 00006296 E8630A0000          <1>         call    dos_prompt
   134                              <1>               
   135                              <1> _end_of_mainprog:
   136 0000629B BE[E4FE0000]        <1>         mov     esi, msg_CRLF_temp
   137 000062A0 E818000000          <1> 	call 	print_msg
   138 000062A5 BE[EAFE0000]        <1> 	mov 	esi, mainprog_Version
   139 000062AA E80E000000          <1> 	call 	print_msg
   140                              <1> 	; 24/01/2016
   141 000062AF 28E4                <1> 	sub	ah, ah
   142 000062B1 E860A9FFFF          <1> 	call	int16h ; call getch
   143 000062B6 E940AEFFFF          <1> 	jmp	cpu_reset
   144                              <1> 
   145 000062BB EBFE                <1> infinitiveloop: jmp short infinitiveloop
   146                              <1> 
   147                              <1> print_msg:
   148                              <1> 	; 13/05/2016
   149                              <1> 	; 04/01/2016
   150                              <1> 	; 01/07/2015
   151                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   152                              <1> 	; 07/03/2014 (Retro UNIX 8086 v1)
   153                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI, EDI)
   154                              <1> 	;
   155 000062BD 8A3D[0E420100]      <1> 	mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   156                              <1> 	;mov	bl, 07h ; Black background, light gray forecolor
   157                              <1> 
   158 000062C3 AC                  <1> 	lodsb
   159                              <1> pmsg1:
   160 000062C4 56                  <1> 	push 	esi
   161                              <1> 	;mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   162 000062C5 B307                <1> 	mov	bl, 07h ; Black background, light gray forecolor
   163 000062C7 E8E6B9FFFF          <1> 	call 	_write_tty
   164 000062CC 5E                  <1> 	pop	esi
   165 000062CD AC                  <1> 	lodsb
   166 000062CE 20C0                <1> 	and 	al, al
   167 000062D0 75F2                <1> 	jnz 	short pmsg1
   168 000062D2 C3                  <1> 	retn
   169                              <1> 
   170                              <1> clear_screen:
   171                              <1> 	; 13/05/2016
   172                              <1> 	; 30/01/2016
   173                              <1> 	; 24/01/2016
   174                              <1> 	; 04/01/2016
   175 000062D3 0FB61D[0E420100]    <1> 	movzx	ebx, byte [ACTIVE_PAGE] ; video page number (0 to 7)
   176 000062DA 8AA3[335E0000]      <1> 	mov 	ah, [ebx+vmode] ; default = 03h (80x25 text)
   177 000062E0 80FC04              <1> 	cmp	ah, 4
   178 000062E3 7205                <1> 	jb	short cls1
   179 000062E5 80FC07              <1> 	cmp	ah, 7
   180 000062E8 7526                <1> 	jne	short vga_clear
   181                              <1> cls1:
   182                              <1> 	;mov	bh, bl
   183                              <1> 	;mov	bl, 7
   184 000062EA 3A25[225E0000]      <1> 	cmp	ah, [CRT_MODE] ; current video mode ? 
   185                              <1> 	;je	short cls2 ; yes (current video mode = 3)
   186                              <1> 	;;call	set_mode_3 ; set video mode to 3 (& clear screen)
   187                              <1> 	;;retn
   188                              <1> 	;jmp	set_mode_3
   189 000062F0 0F85C6B9FFFF        <1> 	jne	set_mode_3
   190                              <1> cls2:
   191 000062F6 88DF                <1> 	mov	bh, bl ; video page (0 to 7)
   192 000062F8 B307                <1> 	mov	bl, 07h ; attribute to be used on blanked line
   193 000062FA 28C0                <1> 	sub 	al, al ; 0 =  entire window
   194 000062FC 6631C9              <1> 	xor 	cx, cx
   195 000062FF 66BA4F18            <1> 	mov 	dx, 184Fh
   196 00006303 E802B7FFFF          <1> 	call	_scroll_up ; 24/01/2016
   197                              <1> 	;
   198                              <1> 	;mov	bh, [ACTIVE_PAGE] ; video page number (0 to 7)
   199 00006308 6631D2              <1> 	xor 	dx, dx
   200 0000630B E838BAFFFF          <1> 	call	_set_cpos ; 24/01/2016 
   201                              <1> 	;retn
   202                              <1> vga_clear:
   203 00006310 C3                  <1> 	retn	
   204                              <1> 
   205                              <1> panic:
   206                              <1> 	; 13/05/2016 (TRDOS 386 = TRDOS v2)
   207                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   208                              <1> 	; 07/03/2014 (Retro UNIX 8086 v1)
   209 00006311 BE[520B0100]        <1> 	mov 	esi, panic_msg
   210 00006316 E8A2FFFFFF          <1> 	call 	print_msg
   211                              <1> key_to_reboot:
   212                              <1>         ; 24/01/2016
   213 0000631B 28E4                <1>         sub     ah, ah
   214 0000631D E8F4A8FFFF          <1>         call    int16h ; call   getch
   215                              <1>         ; wait for a character from the current tty
   216                              <1> 	;
   217 00006322 B00A                <1> 	mov	al, 0Ah
   218 00006324 8A3D[0E420100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
   219 0000632A B307                <1> 	mov	bl, 07h ; Black background, 
   220                              <1> 			; light gray forecolor
   221 0000632C E881B9FFFF          <1> 	call 	_write_tty
   222 00006331 E9C5ADFFFF          <1> 	jmp	cpu_reset 
   223                              <1> 
   224                              <1> ctrlbrk:
   225                              <1> 	; 12/11/2015
   226                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   227                              <1> 	; 06/12/2013 (Retro UNIX 8086 v1)
   228                              <1> 	;
   229                              <1> 	; INT 1Bh (control+break) handler		
   230                              <1> 	;
   231                              <1>       	; Retro Unix 8086 v1 feature only!
   232                              <1>       	;
   233 00006336 66833D[465D0100]00  <1> 	cmp 	word [u.intr], 0
   234 0000633E 7645                <1> 	jna 	short cbrk4
   235                              <1> cbrk0:
   236                              <1> 	; 12/11/2015
   237                              <1> 	; 06/12/2013
   238 00006340 66833D[485D0100]00  <1> 	cmp 	word [u.quit], 0
   239 00006348 743B                <1> 	jz	short cbrk4
   240                              <1> 	;
   241                              <1> 	; 20/09/2013	
   242 0000634A 6650                <1> 	push 	ax
   243 0000634C A0[0E420100]        <1> 	mov	al, [ptty]
   244                              <1> 	;
   245                              <1> 	; 12/11/2015
   246                              <1> 	;
   247                              <1> 	; ctrl+break (EOT, CTRL+D) from serial port
   248                              <1> 	; or ctrl+break from console (pseudo) tty
   249                              <1> 	; (!redirection!)
   250                              <1> 	;
   251 00006351 3C08                <1> 	cmp	al, 8 ; serial port tty nums > 7
   252 00006353 7211                <1>         jb      short cbrk1 ; console (pseudo) tty
   253                              <1> 	;	
   254                              <1> 	; Serial port interrupt handler sets [ptty]
   255                              <1> 	; to the port's tty number (as temporary).
   256                              <1> 	;
   257                              <1> 	; If active process is using a stdin or 
   258                              <1> 	; stdout redirection (by the shell),
   259                              <1>         ; console tty keyboard must be available
   260                              <1> 	; to terminate running process,
   261                              <1> 	; in order to prevent a deadlock. 
   262                              <1> 	;
   263 00006355 52                  <1> 	push	edx
   264 00006356 0FB615[4F5D0100]    <1> 	movzx	edx, byte [u.uno]
   265 0000635D 3A82[1B5A0100]      <1> 	cmp     al, [edx+p.ttyc-1] ; console tty (rw)
   266 00006363 5A                  <1> 	pop	edx
   267 00006364 7412                <1> 	je	short cbrk2
   268                              <1> cbrk1:
   269 00006366 FEC0                <1> 	inc 	al  ; [u.ttyp] : 1 based tty number
   270                              <1> 	; 06/12/2013
   271 00006368 3A05[305D0100]      <1> 	cmp	al, [u.ttyp] ; recent open tty (r)
   272 0000636E 7408                <1> 	je	short cbrk2	
   273 00006370 3A05[315D0100]      <1>         cmp     al, [u.ttyp+1] ; recent open tty (w)
   274 00006376 750B                <1> 	jne	short cbrk3	
   275                              <1> cbrk2:
   276                              <1> 	;; 06/12/2013
   277                              <1> 	;mov	ax, [u.quit]
   278                              <1> 	;and	ax, ax
   279                              <1> 	;jz	short cbrk3
   280                              <1> 	;
   281 00006378 6631C0              <1> 	xor	ax, ax ; 0
   282 0000637B 6648                <1> 	dec	ax
   283                              <1> 	; 0FFFFh = 'ctrl+brk' keystroke
   284 0000637D 66A3[485D0100]      <1> 	mov	[u.quit], ax
   285                              <1> cbrk3:
   286 00006383 6658                <1> 	pop	ax
   287                              <1> cbrk4:
   288 00006385 C3                  <1> 	retn
  2305                                  %include 'trdosk2.s' ; 04/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - DRV INIT : trdosk2.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 06/07/2016
     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> ; 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> 	; 12/02/2016
    18                              <1> 	; 06/01/2016
    19                              <1> 	;  	('diskinit.inc', 'diskio.inc' integration)
    20                              <1> 	; 04/01/2016 (TRDOS 386 = TRDOS v2.0)
    21                              <1> 	; 07/08/2011
    22                              <1> 	; 20/09/2009
    23                              <1> 	; 2005
    24 00006386 0FB60D[7C420100]    <1> 	movzx	ecx, byte [HF_NUM] ; number of fixed disks
    25 0000638D 80F901              <1> 	cmp	cl, 1
    26 00006390 7301                <1> 	jnb	short load_hd_partition_tables
    27                              <1> 	; No hard disks
    28 00006392 C3                  <1> 	retn
    29                              <1> load_hd_partition_tables:
    30 00006393 8B35[80420100]      <1> 	mov	esi, [HDPM_TBL_VEC] ; primary master disk FDPT
    31 00006399 BF[A6460100]        <1> 	mov 	edi, PTable_hd0
    32 0000639E B280                <1> 	mov 	dl, 80h
    33                              <1> load_next_hd_partition_table:
    34 000063A0 51                  <1> 	push	ecx
    35 000063A1 57                  <1> 	push	edi
    36 000063A2 56                  <1> 	push	esi ; FDPT (+ DPTE) address
    37 000063A3 8A4614              <1> 	mov	al, [esi+20] ; DPTE offset 4
    38 000063A6 2440                <1> 	and	al, 40h ;  LBA bit (bit 6)
    39                              <1> 	;shr	al, 6
    40 000063A8 A2[A7480100]        <1> 	mov 	[HD_LBA_yes], al
    41 000063AD E81C040000          <1> 	call	load_masterboot
    42 000063B2 7275                <1> 	jc	short pass_pt_this_hard_disk
    43                              <1> 
    44 000063B4 BE[64460100]        <1> 	mov	esi, PartitionTable
    45 000063B9 89F3                <1> 	mov	ebx, esi
    46                              <1> 	;mov	ecx, 16
    47 000063BB B110                <1> 	mov	cl, 16
    48 000063BD F3A5                <1> 	rep 	movsd
    49 000063BF 89DE                <1> 	mov 	esi, ebx 
    50 000063C1 C605[555C0000]04    <1> 	mov 	byte [hdc], 4 ; 4 - partition index
    51                              <1> loc_validate_hdp_partition:
    52 000063C8 807E0400            <1> 	cmp 	byte [esi+ptFileSystemID], 0
    53 000063CC 7641                <1> 	jna	short loc_validate_next_hdp_partition2
    54 000063CE 56                  <1> 	push	esi ; Masterboot partition table offset
    55 000063CF 52                  <1> 	push	edx ; dl = Physical drive number 
    56 000063D0 FE05[A8480100]      <1> 	inc	byte [PP_Counter]
    57 000063D6 31FF                <1>         xor	edi, edi ; 0  
    58                              <1> 	; Input -> ESI = PartitionTable offset
    59                              <1> 	; DL = Hard disk drive number 
    60                              <1> 	; EDI = 0 -> Primary Partition
    61                              <1> 	; EDI > 0 -> Extended Partition's Start Sector   
    62 000063D8 E879010000          <1> 	call 	validate_hd_fat_partition
    63 000063DD 730A                <1> 	jnc 	short loc_set_valid_hdp_partition_entry
    64                              <1> 	;pop	edx
    65                              <1> 	;push	edx
    66 000063DF 8B1424              <1> 	mov	edx, [esp] 
    67 000063E2 E8C5020000          <1> 	call	validate_hd_fs_partition
    68 000063E7 7224                <1> 	jc	short loc_validate_next_hdp_partition1
    69                              <1> loc_set_valid_hdp_partition_entry:
    70 000063E9 8A0D[E2FE0000]      <1> 	mov 	cl, [Last_DOS_DiskNo] 
    71 000063EF 80C141              <1> 	add 	cl, 'A'
    72                              <1> 	; ESI = Logical dos drive description table address
    73 000063F2 880E                <1> 	mov	[esi+LD_Name], cl
    74 000063F4 8A6602              <1> 	mov	ah, [esi+LD_PhyDrvNo]
    75 000063F7 88E0                <1> 	mov	al, ah ; Physical drive number
    76 000063F9 2C80                <1> 	sub	al, 80h
    77 000063FB C0E002              <1> 	shl	al, 2
    78 000063FE 0404                <1> 	add	al, 4 ; 0 Based
    79 00006400 2A05[555C0000]      <1> 	sub	al, [hdc] ; 4 - partition index
    80                              <1> 	; AL = Partition entry/index, 0 based
    81                              <1> 	;  0 -> hd 0, Partition Table offset = 0
    82                              <1> 	; 15 -> hd 3, Partition Table offset = 3
    83                              <1> 	;mov	[esi+LD_PartitionEntry], al 
    84 00006406 80EC7E              <1> 	sub 	ah, 7Eh
    85                              <1> 	; AH = Physical drive index, zero based
    86                              <1> 	;  0 for drive A:, 2 for drive C:
    87                              <1> 	;mov 	[esi+LD_DParamEntry], ah 
    88 00006409 6689467C            <1> 	mov 	[esi+LD_PartitionEntry], ax
    89                              <1> loc_validate_next_hdp_partition1:
    90 0000640D 5A                  <1> 	pop 	edx ; dl = Physical drive number 
    91 0000640E 5E                  <1> 	pop	esi ; Masterboot partition table offset
    92                              <1> loc_validate_next_hdp_partition2:
    93                              <1> 	; ESI = PartitionTable offset
    94                              <1> 	; DL = Hard/Fixed disk drive number
    95 0000640F FE0D[555C0000]      <1> 	dec	byte [hdc] ; 4 - partition index
    96 00006415 7412                <1> 	jz	short pass_pt_this_hard_disk
    97 00006417 83C610              <1> 	add	esi, 16 ; 10h
    98 0000641A EBAC                <1> 	jmp	short loc_validate_hdp_partition
    99                              <1> loc_next_hd_partition_table:
   100 0000641C FEC2                <1> 	inc	dl
   101 0000641E 83C620              <1> 	add	esi, 32 ; next FDPT address
   102 00006421 83C740              <1> 	add	edi, 64 ; next partition table destination
   103 00006424 E977FFFFFF          <1>         jmp     load_next_hd_partition_table
   104                              <1> pass_pt_this_hard_disk:
   105 00006429 5E                  <1> 	pop	esi ; FDPT (+ DPTE) address
   106 0000642A 5F                  <1> 	pop	edi ; Ptable_hd?
   107 0000642B 59                  <1> 	pop	ecx
   108 0000642C E2EE                <1> 	loop	loc_next_hd_partition_table
   109 0000642E 803D[A8480100]01    <1> 	cmp	byte [PP_Counter], 1
   110 00006435 7301                <1> 	jnb	short load_extended_dos_partitions
   111                              <1> 	; Empty partition table
   112 00006437 C3                  <1> 	retn 
   113                              <1> load_extended_dos_partitions:
   114 00006438 BE[A6460100]        <1> 	mov	esi, PTable_hd0
   115 0000643D BF[A6470100]        <1> 	mov	edi, PTable_ep0
   116 00006442 C605[555C0000]80    <1> 	mov	byte [hdc], 80h
   117                              <1> next_hd_extd_partition:
   118 00006449 56                  <1> 	push	esi ; PTable_hd? offset
   119 0000644A 57                  <1> 	push	edi ; PTable_ep?
   120                              <1> 	;mov	ecx, 4
   121 0000644B B104                <1> 	mov	cl, 4
   122 0000644D 8A15[555C0000]      <1> 	mov	dl, byte [hdc]
   123                              <1> hd_check_fs_id_05h:
   124 00006453 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
   125 00006456 3C05                <1> 	cmp	al, 05h ; Is it an extended dos partition ?
   126 00006458 7404                <1> 	je	short loc_set_ep_start_sector
   127 0000645A 3C0F                <1> 	cmp	al, 0Fh ; Is it an extended win4 (LBA mode) partition ?
   128 0000645C 7546                <1> 	jne	short continue_to_check_ep
   129                              <1> loc_set_ep_start_sector:
   130 0000645E FE05[A9480100]      <1> 	inc	byte [EP_Counter]
   131 00006464 88D4                <1> 	mov	ah, dl ; byte [hdc]
   132 00006466 86E0                <1> 	xchg	ah, al ; al = Drv Number, ah = Partition Identifier
   133 00006468 50                  <1> 	push	eax 
   134 00006469 30E4                <1> 	xor	ah, ah  
   135 0000646B 2C80                <1> 	sub	al, 80h
   136 0000646D 50                  <1> 	push	eax
   137 0000646E C0E002              <1> 	shl	al, 2 ; al = al * 4
   138 00006471 0FB6D8              <1> 	movzx	ebx, al
   139 00006474 81C3[AA480100]      <1> 	add	ebx, EP_StartSector
   140 0000647A 8B4608              <1> 	mov	eax, [esi+ptStartSector]
   141                              <1>         ; EAX = Extended partition's start sector
   142 0000647D 8903                <1>         mov	[ebx], eax
   143 0000647F 58                  <1> 	pop	eax ; AL = Drv number - 80h, AH = 0 
   144 00006480 5A                  <1> 	pop	edx ; DL = Drv number, DH = Partition ID
   145 00006481 BB[A6440100]        <1> 	mov	ebx, MasterBootBuff
   146 00006486 803D[A7480100]01    <1> 	cmp	byte [HD_LBA_yes], 1 ; LBA ready = Yes
   147 0000648D 7240                <1> 	jb	short loc_hd_load_ep_05h
   148 0000648F 80FE05              <1> 	cmp	dh, 05h
   149 00006492 743B                <1> 	je	short loc_hd_load_ep_05h
   150                              <1> loc_hd_load_ep_0Fh:
   151                              <1> 	; 04/01/2016
   152 00006494 51                  <1> 	push	ecx
   153 00006495 8B4E08              <1> 	mov	ecx, [esi+ptStartSector] ; sector number
   154                              <1> 	;mov	ebx, MasterBootBuff ; buffer address
   155                              <1> 	; LBA read/write (with private LBA function) 
   156                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   157                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   158 00006498 B41B                <1> 	mov	ah, 1Bh ; LBA read
   159 0000649A B001                <1> 	mov	al, 1 ; sector count
   160 0000649C E865DDFFFF          <1> 	call	int13h
   161 000064A1 59                  <1> 	pop	ecx
   162 000064A2 733F                <1> 	jnc	short loc_hd_move_ep_table
   163                              <1> continue_to_check_ep:
   164 000064A4 83C610              <1> 	add	esi, 16
   165 000064A7 E2AA                <1> 	loop	hd_check_fs_id_05h
   166                              <1> continue_check_ep_next_disk:
   167 000064A9 5F                  <1> 	pop	edi ; PTable_ep?
   168 000064AA 5E                  <1> 	pop	esi ; PTable_hd?
   169 000064AB A0[7C420100]        <1> 	mov	al, [HF_NUM] ; number of hard disks
   170 000064B0 047F                <1> 	add	al, 7Fh
   171 000064B2 3805[555C0000]      <1> 	cmp	[hdc], al
   172 000064B8 0F8392000000        <1> 	jnb	loc_validating_hd_partitions_ok
   173 000064BE 83C640              <1> 	add	esi, 64
   174 000064C1 83C740              <1> 	add	edi, 64
   175 000064C4 FE05[555C0000]      <1> 	inc	byte [hdc]
   176 000064CA E97AFFFFFF          <1> 	jmp	next_hd_extd_partition
   177                              <1> loc_hd_load_ep_05h:
   178 000064CF 51                  <1> 	push	ecx 
   179 000064D0 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   180 000064D3 668B4E02            <1>         mov     cx, word [esi+ptBeginSector]
   181 000064D7 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   182                              <1> 	;mov	ebx, MasterBootBuff
   183 000064DB E826DDFFFF          <1> 	call	int13h
   184 000064E0 59                  <1> 	pop	ecx  
   185 000064E1 72C1                <1> 	jc	short continue_to_check_ep
   186                              <1> loc_hd_move_ep_table:
   187                              <1>         ;pop	edi
   188                              <1> 	;push	edi  ; PTable_ep?
   189 000064E3 8B3C24              <1> 	mov	edi, [esp]        
   190 000064E6 BE[64460100]        <1>         mov	esi, PartitionTable ; Extended
   191 000064EB 89F3                <1> 	mov	ebx, esi
   192                              <1> 	;mov	ecx, 16
   193 000064ED B110                <1> 	mov	cl, 16
   194 000064EF F3A5                <1>        	rep	movsd
   195 000064F1 89DE                <1> 	mov	esi, ebx 
   196                              <1> loc_set_hde_sub_partition_count:
   197 000064F3 C605[A8480100]04    <1> 	mov	byte [PP_Counter], 4
   198                              <1> loc_validate_hde_partition:
   199 000064FA 807E0400            <1> 	cmp	byte [esi+ptFileSystemID], 0
   200 000064FE 763F                <1> 	jna	short loc_validate_next_hde_partition2
   201 00006500 56                  <1> 	push	esi ; Extended partition table offset
   202 00006501 8A15[555C0000]      <1> 	mov	dl, byte [hdc]
   203 00006507 0FB6C2              <1> 	movzx	eax, dl
   204 0000650A 2C80                <1> 	sub	al, 80h
   205 0000650C C0E002              <1> 	shl	al, 2
   206                              <1> 	; 06/01/2016 
   207                              <1> 	; (TRDOS v1.0 had a bug here, in 'DRV_INIT.ASM')
   208                              <1> 	; BUGFIX *
   209                              <1> 	;mov	ecx, eax
   210 0000650F 88C1                <1> 	mov	cl, al
   211 00006511 80C104              <1> 	add	cl, 4
   212 00006514 2A0D[A8480100]      <1> 	sub	cl, [PP_Counter] ; 4 to 1
   213                              <1> 	; CL = Partition entry/index, 0 based
   214                              <1>         ;  0 -> hd 0, Partition Table offset = 0
   215                              <1>         ; 15 -> hd 3, Partition Table offset = 3
   216 0000651A 88D5                <1>       	mov	ch, dl   
   217 0000651C 80ED7E              <1> 	sub	ch, 7Eh ;
   218                              <1> 	; CH = Physical drive index, zero based
   219                              <1> 	;  0 for drive A:, 2 for drive C:	
   220                              <1> 	; BUGFIX *
   221 0000651F 51                  <1> 	push	ecx ; *
   222 00006520 BF[AA480100]        <1> 	mov	edi, EP_StartSector
   223 00006525 01C7                <1> 	add	edi, eax
   224                              <1> 	; Input -> ESI = PartitionTable offset
   225                              <1> 	; DL = Hard disk drive number   
   226                              <1> 	; EDI = Extended partition start sector pointer
   227 00006527 E82A000000          <1> 	call	validate_hd_fat_partition
   228 0000652C 59                  <1> 	pop	ecx ; *
   229 0000652D 720F                <1> 	jc	short loc_validate_next_hde_partition1
   230                              <1> loc_set_valid_hde_partition_entry:
   231                              <1> 	; 06/01/2016 (TRDOS v2.0)
   232                              <1> 	; BUGFIX *
   233                              <1> 	;mov	[esi+LD_PartitionEntry], cl 
   234                              <1> 	;mov	[esi+LD_DParamEntry], ch 
   235 0000652F 66894E7C            <1> 	mov	[esi+LD_PartitionEntry], cx 
   236                              <1> 	;
   237 00006533 8A0D[E2FE0000]      <1> 	mov	cl, [Last_DOS_DiskNo] 
   238 00006539 80C141              <1> 	add	cl, 'A'
   239 0000653C 880E                <1> 	mov	[esi+LD_Name], cl
   240                              <1> loc_validate_next_hde_partition1:
   241 0000653E 5E                  <1> 	pop	esi ; Extended partition table offset
   242                              <1> loc_validate_next_hde_partition2:
   243                              <1> 	; ESI = Extended partition table offset
   244                              <1> 	; DL = Hard disk drive number
   245 0000653F FE0D[A8480100]      <1> 	dec	byte [PP_Counter]
   246 00006545 0F845EFFFFFF        <1> 	jz	continue_check_ep_next_disk
   247 0000654B 83C610              <1> 	add 	esi, 16 ; 10h
   248 0000654E EBAA                <1> 	jmp	short loc_validate_hde_partition
   249                              <1> loc_validating_hd_partitions_ok:
   250 00006550 A0[E2FE0000]        <1> 	mov	al, [Last_DOS_DiskNo]
   251                              <1> loc_drv_init_retn:
   252 00006555 C3                  <1> 	retn
   253                              <1> 
   254                              <1> validate_hd_fat_partition:
   255                              <1> 	; 12/02/2016
   256                              <1> 	; 07/01/2016 (TRDOS 386 = TRDOS v2.0)
   257                              <1> 	; 07/08/2011
   258                              <1> 	; 23/07/2011
   259                              <1> 	; Input
   260                              <1> 	;   DL = Hard/Fixed Disk Drive Number
   261                              <1> 	;   ESI = PartitionTable offset
   262                              <1> 	;   EDI = Extend. Part. Start Sector Pointer
   263                              <1> 	;   EDI = 0 -> Primary Partition 
   264                              <1> 	;   byte [Last_DOS_DiskNo]
   265                              <1>  	; Output
   266                              <1> 	;  cf=0 -> Validated
   267                              <1> 	;   ESI = Logical dos drv desc. table
   268                              <1> 	;   EBX = FAT boot sector buffer
   269                              <1> 	;   byte [Last_DOS_DiskNo]
   270                              <1> 	;  cf=1 -> Not a valid FAT partition
   271                              <1> 	; EAX, EDX, ECX, EDI -> changed 
   272                              <1> 	
   273                              <1> 	;mov 	esi, PartitionTable
   274 00006556 8A6604              <1> 	mov 	ah, [esi+ptFileSystemID]
   275 00006559 80FC06              <1> 	cmp 	ah, 06h ; FAT16 CHS partition
   276                              <1> 	; 12/02/2016
   277                              <1> 	;jb	short loc_not_a_valid_fat_partition2
   278 0000655C 7305                <1>  	jnb	short vhdp_FAT16_32
   279                              <1> 	;
   280 0000655E 80FC04              <1> 	cmp	ah, 04h ; FAT16 CHS partition (< 32MB)		
   281 00006561 7519                <1> 	jne	short loc_not_a_valid_fat_partition1
   282                              <1> vhdp_FAT16_32:
   283 00006563 B002                <1> 	mov	al, 2
   284 00006565 7417                <1> 	je	short loc_set_valid_hd_partition_params
   285 00006567 80FC0E              <1> 	cmp	ah, 0Eh ; FAT16 LBA partition
   286 0000656A 7710                <1> 	ja	short loc_not_a_valid_fat_partition1
   287 0000656C 7410                <1> 	je	short loc_set_valid_hd_partition_params
   288                              <1> 
   289 0000656E FEC0                <1> 	inc	al ; 3
   290 00006570 80FC0B              <1> 	cmp	ah, 0Bh ; FAT32 CHS partition 
   291 00006573 7409                <1> 	je	short loc_set_valid_hd_partition_params
   292 00006575 7206                <1> 	jb	short loc_not_a_valid_fat_partition2
   293 00006577 80FC0C              <1> 	cmp	ah, 0Ch ; FAT32 LBA partition
   294 0000657A 7402                <1> 	je	short loc_set_valid_hd_partition_params
   295                              <1> loc_not_a_valid_fat_partition1:
   296 0000657C F9                  <1> 	stc
   297                              <1> loc_not_a_valid_fat_partition2:
   298 0000657D C3                  <1> 	retn
   299                              <1> 
   300                              <1> loc_set_valid_hd_partition_params:
   301 0000657E FE05[E2FE0000]      <1> 	inc 	byte [Last_DOS_DiskNo] ; > 1
   302                              <1> 	;
   303 00006584 31DB                <1> 	xor	ebx, ebx
   304 00006586 8A3D[E2FE0000]      <1> 	mov	bh, [Last_DOS_DiskNo] ; * 256	
   305 0000658C 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   306                              <1> 	;
   307 00006592 C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   308 00006596 885302              <1> 	mov	byte [ebx+LD_PhyDrvNo], dl
   309                              <1> 	;mov	byte [ebx+LD_FATType], al ; 2 or 3
   310                              <1> 	;mov	byte [ebx+LD_FSType], ah ; 06h, 0Eh, 0Bh, 0Ch
   311 00006599 66894303            <1> 	mov	word [ebx+LD_FATType], ax
   312                              <1> 	;
   313 0000659D 8B4E08              <1> 	mov	ecx, [esi+ptStartSector]
   314 000065A0 09FF                <1> 	or	edi, edi 
   315 000065A2 7402                <1> 	jz	short pass_hd_FAT_ep_start_sector_adding
   316                              <1> loc_add_hd_FAT_ep_start_sector:
   317 000065A4 030F                <1> 	add	ecx, [edi]
   318                              <1> pass_hd_FAT_ep_start_sector_adding:
   319 000065A6 894B6C              <1> 	mov	[ebx+LD_StartSector], ecx
   320                              <1> loc_hd_FAT_logical_drv_init:
   321 000065A9 89DD                <1> 	mov	ebp, ebx
   322                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   323 000065AB A0[A7480100]        <1> 	mov	al, [HD_LBA_yes] ; 07/01/2016
   324 000065B0 884305              <1> 	mov	[ebx+LD_LBAYes], al
   325 000065B3 BB[BA480100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   326 000065B8 08C0                <1> 	or	al, al
   327 000065BA 740C                <1> 	jz	short loc_hd_FAT_drv_init_load_bs_chs
   328                              <1> loc_hd_FAT_drv_init_load_bs_lba:
   329                              <1> 	; DL = Physical drive number
   330                              <1>    	;mov	ecx, [esi+ptStartSector] ; sector number
   331                              <1> 	;mov	ebx, DOSBootSectorBuff ; buffer address
   332                              <1> 	; LBA read/write (with private LBA function) 
   333                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   334                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   335 000065BC B41B                <1> 	mov	ah, 1Bh ; LBA read
   336 000065BE B001                <1> 	mov	al, 1 ; sector count
   337 000065C0 E841DCFFFF          <1> 	call	int13h
   338 000065C5 7313                <1> 	jnc	short loc_hd_drv_FAT_boot_validation
   339                              <1> loc_not_a_valid_fat_partition3:
   340 000065C7 C3                  <1> 	retn
   341                              <1> loc_hd_FAT_drv_init_load_bs_chs:
   342 000065C8 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   343 000065CB 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   344 000065CF 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   345                              <1> 	;mov	ebx, DOSBootSectorBuff
   346 000065D3 E82EDCFFFF          <1> 	call	int13h
   347 000065D8 72ED                <1> 	jc	short loc_not_a_valid_fat_partition3
   348                              <1> loc_hd_drv_FAT_boot_validation:
   349                              <1> 	;mov	esi, DOSBootSectorBuff
   350 000065DA 89DE                <1> 	mov	esi, ebx
   351 000065DC 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   352 000065E5 751A                <1> 	jne	short loc_not_a_valid_fat_partition4
   353 000065E7 807E15F8            <1> 	cmp	byte [esi+BPB_Media], 0F8h
   354 000065EB 7514                <1> 	jne	short loc_not_a_valid_fat_partition4
   355 000065ED 66837E1600          <1> 	cmp	word [esi+BPB_FATSz16], 0
   356 000065F2 770F                <1> 	ja	short loc_hd_FAT16_BPB
   357 000065F4 807E4229            <1> 	cmp	byte [esi+BS_FAT32_BootSig], 29h
   358 000065F8 7507                <1> 	jne	short loc_not_a_valid_fat_partition4
   359                              <1> loc_hd_FAT32_BPB:
   360 000065FA B92D000000          <1> 	mov	ecx, 45
   361 000065FF EB0D                <1> 	jmp	short loc_hd_move_FAT_BPB
   362                              <1> 	;
   363                              <1> loc_not_a_valid_fat_partition4:
   364 00006601 F9                  <1> 	stc
   365 00006602 C3                  <1> 	retn
   366                              <1> 	;
   367                              <1> loc_hd_FAT16_BPB:
   368 00006603 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
   369 00006607 75F8                <1> 	jne	short loc_not_a_valid_fat_partition4
   370 00006609 B920000000          <1> 	mov	ecx, 32
   371                              <1> loc_hd_move_FAT_BPB:
   372 0000660E 89EF                <1> 	mov 	edi, ebp
   373                              <1> 	;mov	esi, ebx ; Boot sector
   374 00006610 57                  <1> 	push	edi
   375 00006611 83C706              <1> 	add	edi, LD_BPB
   376 00006614 F366A5              <1> 	rep	movsw 
   377 00006617 5E                  <1> 	pop	esi
   378 00006618 0FB74614            <1> 	movzx	eax, word [esi+LD_BPB+BPB_RsvdSecCnt]
   379 0000661C 03466C              <1> 	add	eax, [esi+LD_StartSector]
   380 0000661F 894660              <1> 	mov	[esi+LD_FATBegin], eax
   381 00006622 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
   382 00006626 7224                <1> 	jb	short loc_set_FAT16_RootDirLoc
   383                              <1> loc_set_FAT32_RootDirLoc:
   384 00006628 8B462A              <1> 	mov	eax, [esi+LD_BPB+BPB_FATSz32]
   385 0000662B 0FB65E16            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_NumFATs]
   386 0000662F F7E3                <1> 	mul	ebx
   387 00006631 034660              <1> 	add	eax, [esi+LD_FATBegin]
   388                              <1> loc_set_FAT32_data_begin:
   389 00006634 894668              <1> 	mov	[esi+LD_DATABegin], eax
   390 00006637 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   391                              <1> 	; If Root Directory Cluster <> 2 then
   392                              <1> 	; change the beginning sector value 
   393                              <1> 	; of the root dir by adding sector offset.
   394 0000663A 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
   395 0000663D 83E802              <1> 	sub	eax, 2
   396 00006640 7442                <1> 	jz	short short loc_set_32bit_FAT_total_sectors  
   397                              <1> 	;movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
   398 00006642 8A5E13              <1> 	mov	bl, byte [esi+LD_BPB+BPB_SecPerClust] 
   399 00006645 F7E3                <1> 	mul	ebx
   400 00006647 014664              <1> 	add	[esi+LD_ROOTBegin], eax
   401 0000664A EB38                <1> 	jmp	short loc_set_32bit_FAT_total_sectors
   402                              <1> 	;
   403                              <1> loc_set_FAT16_RootDirLoc:
   404 0000664C 0FB64616            <1> 	movzx	eax, byte [esi+LD_BPB+BPB_NumFATs]
   405 00006650 0FB7561C            <1> 	movzx	edx, word [esi+LD_BPB+BPB_FATSz16]
   406 00006654 F7E2                <1> 	mul	edx
   407 00006656 034660              <1> 	add	eax, [esi+LD_FATBegin]  
   408 00006659 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   409                              <1> loc_set_FAT16_data_begin:
   410 0000665C 894668              <1> 	mov	[esi+LD_DATABegin], eax 
   411 0000665F B820000000          <1> 	mov	eax, 20h  ; Size of a directory entry
   412                              <1> 	;movzx	edx, word [esi+LD_BPB+BPB_RootEntCnt]
   413 00006664 668B5617            <1>         mov     dx, [esi+LD_BPB+BPB_RootEntCnt]
   414 00006668 F7E2                <1>         mul	edx
   415                              <1> 	;mov	ecx, 511
   416 0000666A 66B9FF01            <1> 	mov	cx, 511
   417 0000666E 01C8                <1> 	add	eax, ecx
   418 00006670 41                  <1> 	inc	ecx ; 512
   419 00006671 F7F1                <1> 	div	ecx
   420 00006673 014668              <1> 	add	[esi+LD_DATABegin], eax
   421 00006676 0FB74619            <1> 	movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
   422 0000667A 6685C0              <1> 	test	ax, ax
   423 0000667D 7405                <1> 	jz	short loc_set_32bit_FAT_total_sectors
   424                              <1> loc_set_16bit_FAT_total_sectors:
   425 0000667F 894670              <1> 	mov	[esi+LD_TotalSectors], eax
   426 00006682 EB06                <1> 	jmp	short loc_set_hd_FAT_cluster_count
   427                              <1> loc_set_32bit_FAT_total_sectors:
   428 00006684 8B4626              <1> 	mov	eax, [esi+LD_BPB+BPB_TotalSec32]
   429 00006687 894670              <1> 	mov	[esi+LD_TotalSectors], eax
   430                              <1> loc_set_hd_FAT_cluster_count:
   431 0000668A 8B5668              <1> 	mov	edx, [esi+LD_DATABegin]
   432 0000668D 2B566C              <1> 	sub	edx, [esi+LD_StartSector]
   433 00006690 29D0                <1> 	sub	eax, edx
   434 00006692 31D2                <1> 	xor	edx, edx ; 0
   435 00006694 0FB64E13            <1>         movzx   ecx, byte [esi+LD_BPB+BPB_SecPerClust]
   436 00006698 F7F1                <1>         div	ecx 
   437 0000669A 894678              <1> 	mov	[esi+LD_Clusters], eax
   438                              <1> 	; Maximum Valid Cluster Number= EAX +1
   439                              <1> 	; with 2 reserved clusters= EAX +2
   440                              <1> loc_set_hd_FAT_fs_free_sectors:
   441                              <1> 	;mov	dword [esi+LD_FreeSectors], 0
   442 0000669D E859010000          <1> 	call	get_free_FAT_sectors
   443 000066A2 7207                <1> 	jc	short loc_validate_hd_FAT_partition_retn
   444 000066A4 894674              <1> 	mov	[esi+LD_FreeSectors], eax
   445 000066A7 C6467E06            <1> 	mov	byte [esi+LD_MediaChanged], 6  ; Volume Name Reset
   446                              <1> 	;mov	cl, [Last_DOS_DiskNo] 
   447                              <1> 	;add	cl, 'A'
   448                              <1> 	;mov	[esi+LD_FS_Name], cl
   449                              <1> 
   450                              <1> loc_validate_hd_FAT_partition_retn:         
   451 000066AB C3                  <1> 	retn
   452                              <1> 
   453                              <1> validate_hd_fs_partition:
   454                              <1> 	; 13/02/2016
   455                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   456                              <1> 	; 29/01/2011
   457                              <1> 	; 23/07/2011
   458                              <1> 	; Input
   459                              <1> 	;   DL = Hard/Fixed Disk Drive Number
   460                              <1> 	;   ESI = PartitionTable offset
   461                              <1> 	;   byte [Last_DOS_DiskNo]
   462                              <1> 	; Output
   463                              <1> 	;  cf=0 -> Validated
   464                              <1> 	;   ESI = Logical dos drv desc. table
   465                              <1> 	;   EBX = Singlix FS boot sector buffer
   466                              <1> 	;   byte [Last_DOS_DiskNo]
   467                              <1> 	;  cf=1 -> Not a valid 'Singlix FS' partition
   468                              <1> 	; EAX, EDX, ECX, EDI -> changed 
   469                              <1> 
   470                              <1> 	;mov	esi, PartitionTable
   471 000066AC 8A6604              <1> 	mov	ah, [esi+ptFileSystemID]
   472 000066AF 80FCA1              <1> 	cmp	ah, 0A1h ; SINGLIX FS1 (trfs1) partition
   473 000066B2 7549                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   474                              <1> loc_set_valid_hd_fs_partition_params:
   475 000066B4 FE05[E2FE0000]      <1> 	inc	byte [Last_DOS_DiskNo] ; > 1
   476 000066BA 30C0                <1> 	xor	al, al ; mov al, 0
   477                              <1> 	;mov	[drv], dl
   478 000066BC 29DB                <1> 	sub	ebx, ebx ; 0
   479 000066BE 8A3D[E2FE0000]      <1> 	mov	bh, [Last_DOS_DiskNo] 
   480 000066C4 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   481 000066CA C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   482 000066CE 885302              <1> 	mov	[ebx+LD_PhyDrvNo], dl
   483                              <1> 	;mov	[ebx+LD_FATType], al ; 0
   484                              <1> 	;mov	[ebx+LD_FSType], ah
   485 000066D1 66894303            <1> 	mov	[ebx+LD_FATType], ax
   486                              <1> 	;mov	eax, [esi+ptStartSector]
   487                              <1> 	;mov	[ebx+LD_StartSector], eax
   488                              <1> loc_hd_fs_logical_drv_init:
   489 000066D5 89DD                <1> 	mov	ebp, ebx ; 10/01/2016
   490                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   491 000066D7 A0[A7480100]        <1> 	mov	al, [HD_LBA_yes] ; 10/01/2016
   492 000066DC 884305              <1> 	mov	[ebx+LD_LBAYes], al
   493 000066DF 89DE                <1> 	mov	esi, ebx
   494 000066E1 BB[BA480100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   495 000066E6 08C0                <1> 	or	al, al
   496 000066E8 7515                <1> 	jnz	short loc_hd_fs_drv_init_load_bs_lba
   497                              <1> loc_hd_fs_drv_init_load_bs_chs:
   498 000066EA 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   499 000066ED 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   500 000066F1 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   501                              <1> 	;mov	ebx, DOSBootSectorBuff
   502 000066F5 E80CDBFFFF          <1> 	call	int13h
   503 000066FA 7311                <1> 	jnc	short loc_hd_drv_fs_boot_validation
   504                              <1> loc_validate_hd_fs_partition_err_retn:
   505 000066FC C3                  <1> 	retn
   506                              <1> loc_validate_hd_fs_partition_stc_retn:
   507 000066FD F9                  <1> 	stc
   508 000066FE C3                  <1> 	retn
   509                              <1> loc_hd_fs_drv_init_load_bs_lba:
   510                              <1> 	; DL = Physical drive number
   511                              <1> 	;mov	esi, ebx
   512 000066FF 8B4E08              <1>    	mov	ecx, [esi+ptStartSector] ; sector number
   513                              <1> 	;mov	ebx, DOSBootSectorBuff ; buffer address
   514                              <1> 	; LBA read/write (with private LBA function) 
   515                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   516                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   517 00006702 B41B                <1> 	mov	ah, 1Bh ; LBA read
   518 00006704 B001                <1> 	mov	al, 1 ; sector count
   519 00006706 E8FBDAFFFF          <1> 	call	int13h
   520 0000670B 72EF                <1> 	jc	short loc_validate_hd_fs_partition_err_retn
   521                              <1> loc_hd_drv_fs_boot_validation:
   522                              <1> 	;mov	esi, DOSBootSectorBuff
   523 0000670D 89DE                <1> 	mov	esi, ebx ; Boot sector buffer
   524 0000670F 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   525 00006718 75E3                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   526                              <1>         ;
   527                              <1> 	;Singlix FS Extensions to TR-DOS (7/6/2009) 
   528 0000671A 66817E035346        <1> 	cmp	word [esi+bs_FS_Identifier], 'SF'
   529 00006720 75DB                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   530                              <1>         ;'A1h' check is not necessary
   531                              <1> 	;  if 'FS' check is passed as OK/Yes.
   532 00006722 807E09A1            <1> 	cmp	byte [esi+bs_FS_PartitionID], 0A1h
   533 00006726 75D5                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   534                              <1> 	;
   535 00006728 89EF                <1> 	mov	edi, ebp ; 10/01/2016
   536                              <1> 	;
   537 0000672A 8A462D              <1> 	mov	al, byte [esi+bs_FS_LBA_Ready]
   538 0000672D 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
   539                              <1> 	;
   540                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
   541 00006730 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
   542 00006733 884706              <1> 	mov	byte [edi+LD_FS_MediaAttrib], al
   543                              <1> 	;
   544 00006736 8A460A              <1> 	mov	al, [esi+bs_FS_VersionMaj]
   545 00006739 884707              <1> 	mov	[edi+LD_FS_VersionMajor], al
   546                              <1> 	;
   547 0000673C 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
   548 00006740 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
   549 00006744 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
   550 00006747 6698                <1> 	cbw
   551 00006749 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
   552 0000674D 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
   553                              <1> 	;cbw
   554 00006750 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
   555                              <1> 	;
   556 00006754 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
   557 00006757 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
   558 0000675A 8B5618              <1> 	mov	edx, [esi+bs_FS_MATLocation]
   559 0000675D 89570C              <1> 	mov	[edi+LD_FS_MATLocation], edx
   560 00006760 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
   561 00006763 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
   562 00006766 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
   563 00006769 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
   564 0000676C 8B4710              <1> 	mov	eax, [edi+bs_FS_VolumeSize]
   565 0000676F 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
   566                              <1> 	;
   567 00006772 89D0                <1> 	mov	eax, edx ; [edi+LD_FS_MATLocation]
   568 00006774 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   569 00006777 89FE                <1> 	mov	esi, edi
   570                              <1> mread_hd_fs_MAT_sector:
   571                              <1>        ;mov	ebx, DOSBootSectorBuff
   572 00006779 B901000000          <1> 	mov	ecx, 1
   573 0000677E E866890000          <1> 	call	disk_read
   574 00006783 7248                <1> 	jc	short loc_validate_hd_fs_partition_retn
   575                              <1> 	; EDI will not be changed
   576 00006785 89DE                <1> 	mov	esi, ebx
   577                              <1> use_hdfs_mat_sector_params:
   578 00006787 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
   579 0000678A 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
   580 0000678D 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
   581 00006790 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
   582 00006793 8B4614              <1> 	mov	eax, [esi+FS_MAT_FreeSectors]
   583 00006796 894774              <1>         mov     [edi+LD_FS_FreeSectors], eax
   584 00006799 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
   585 0000679C 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
   586 0000679F 8B4708              <1> 	mov	eax, [edi+LD_FS_RootDirD]
   587 000067A2 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   588 000067A5 89FE                <1> 	mov	esi, edi   
   589                              <1> read_hd_fs_RDT_sector:
   590 000067A7 BB[BA480100]        <1> 	mov	ebx, DOSBootSectorBuff
   591                              <1> 	;mov	ecx, 1
   592 000067AC B101                <1> 	mov	cl, 1
   593 000067AE E836890000          <1> 	call	disk_read
   594 000067B3 7218                <1> 	jc	short loc_validate_hd_fs_partition_retn
   595                              <1> 	; EDI will not be changed
   596 000067B5 89DE                <1> 	mov	esi, ebx
   597                              <1> use_hdfs_RDT_sector_params:
   598 000067B7 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
   599 000067BA 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
   600 000067BD 57                  <1> 	push	edi
   601                              <1> 	;mov	ecx, 16
   602 000067BE B110                <1> 	mov	cl, 16
   603 000067C0 83C640              <1> 	add	esi, FS_RDT_VolumeName
   604 000067C3 83C72C              <1> 	add	edi, LD_FS_VolumeName
   605 000067C6 F3A5                <1> 	rep	movsd ; 64 bytes
   606 000067C8 5E                  <1> 	pop	esi
   607                              <1> 		; Volume Name Reset
   608 000067C9 C6467E06            <1>         mov     byte [esi+LD_FS_MediaChanged], 6
   609                              <1> 	;
   610                              <1>         ;mov	cl, [Last_DOS_DiskNo] 
   611                              <1> 	;add	cl, 'A'
   612                              <1> 	;mov	[esi+LD_FS_Name], cl
   613                              <1> 
   614                              <1> loc_validate_hd_fs_partition_retn:
   615 000067CD C3                  <1> 	retn
   616                              <1> 
   617                              <1> load_masterboot:
   618                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   619                              <1> 	; 2005 - 2011
   620                              <1> 	; input -> DL = drive number
   621 000067CE B40D                <1> 	mov	ah, 0Dh ; Alternate disk reset
   622 000067D0 E831DAFFFF          <1> 	call	int13h
   623 000067D5 7301                <1> 	jnc	short pass_reset_error
   624                              <1> harddisk_error:
   625 000067D7 C3                  <1>   	retn
   626                              <1> pass_reset_error:
   627 000067D8 BB[A6440100]        <1> 	mov	ebx, MasterBootBuff
   628 000067DD 66B80102            <1> 	mov	ax, 0201h
   629 000067E1 66B90100            <1> 	mov	cx, 1
   630 000067E5 30F6                <1> 	xor	dh, dh
   631 000067E7 E81ADAFFFF          <1>  	call	int13h
   632 000067EC 72E9                <1> 	jc	short harddisk_error
   633                              <1> 	;
   634 000067EE 66813D[A4460100]55- <1> 	cmp	word [MBIDCode], 0AA55h
   634 000067F6 AA                  <1>
   635 000067F7 7401                <1> 	je	short load_masterboot_ok
   636 000067F9 F9                  <1> 	stc
   637                              <1> load_masterboot_ok:
   638 000067FA C3                  <1> 	retn
   639                              <1> 
   640                              <1> get_free_FAT_sectors:
   641                              <1> 	; 29/02/2016
   642                              <1> 	; 13/02/2016
   643                              <1> 	; 04/02/2016
   644                              <1> 	; 07/01/2016 (TRDOS 386 = TRDOS v2.0)
   645                              <1> 	; 11/07/2010
   646                              <1> 	; 21/06/2009
   647                              <1> 	; INPUT: ESI = Logical DOS Drive Description Table address
   648                              <1> 	; OUTPUT: STC => Error
   649                              <1>         ;	cf = 0 and EAX = Free FAT sectors
   650                              <1> 	; Also, related parameters and FAT buffer will be reset and updated
   651                              <1> 
   652 000067FB 31C0                <1> 	xor	eax, eax
   653                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Reset
   654                              <1> 	
   655 000067FD 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
   656 00006801 7650                <1> 	jna	short loc_gfc_get_fat_free_clusters
   657                              <1> 
   658                              <1> 	; 29/02/2016
   659 00006803 48                  <1> 	dec	eax ; 0FFFFFFFFh
   660 00006804 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count (reset)
   661 00006807 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster (reset)
   662 0000680A 40                  <1> 	inc	eax ; 0
   663                              <1> 	;
   664 0000680B 668B4636            <1> 	mov	ax, [esi+LD_BPB+BPB_FSInfo]
   665 0000680F 03466C              <1> 	add	eax, [esi+LD_StartSector]
   666                              <1> 
   667 00006812 BB[BA480100]        <1> 	mov	ebx, DOSBootSectorBuff
   668 00006817 B901000000          <1> 	mov	ecx, 1
   669 0000681C E8C8880000          <1>  	call	disk_read
   670 00006821 7301                <1> 	jnc	short loc_gfc_check_fsinfo_signs
   671                              <1> retn_gfc_get_fsinfo_sec:
   672 00006823 C3                  <1> 	retn
   673                              <1> 
   674                              <1> loc_gfc_check_fsinfo_signs:
   675 00006824 BB[BA480100]        <1> 	mov 	ebx, DOSBootSectorBuff ; 13/02/2016
   676 00006829 813B52526141        <1>         cmp     dword [ebx], 41615252h
   677 0000682F 7520                <1> 	jne	short retn_gfc_get_fsinfo_stc
   678                              <1> 	;add	ebx, 484
   679                              <1> 	;cmp	dword [ebx], 61417272h
   680 00006831 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
   680 0000683A 61                  <1>
   681 0000683B 7514                <1> 	jne	short retn_gfc_get_fsinfo_stc
   682                              <1> 	;add	ebx, 4
   683                              <1> 	;mov	eax, [ebx]
   684 0000683D 8B83E8010000        <1> 	mov	eax, [ebx+488]
   685                              <1> 	; 29/02/2016
   686 00006843 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
   687 00006846 8B93EC010000        <1> 	mov	edx,  [ebx+492] 
   688 0000684C 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster
   689                              <1> 	;
   690 0000684F EB12                <1> 	jmp	short retn_from_get_free_fat32_clusters
   691                              <1> 
   692                              <1> retn_gfc_get_fsinfo_stc:
   693 00006851 F9                  <1> 	stc
   694 00006852 C3                  <1> 	retn
   695                              <1> 
   696                              <1> loc_gfc_get_fat_free_clusters:
   697                              <1> 	;mov	eax, 2
   698 00006853 B002                <1> 	mov	al, 2
   699                              <1> 	;mov	[FAT_CurrentCluster], eax
   700                              <1> loc_gfc_loop_get_next_cluster:
   701 00006855 E823500000          <1> 	call	get_next_cluster
   702 0000685A 730E                <1> 	jnc	short loc_gfc_free_fat_clusters_cont
   703 0000685C 21C0                <1> 	and	eax, eax
   704 0000685E 7411                <1> 	jz	short loc_gfc_pass_inc_free_cluster_count
   705                              <1>  
   706                              <1> retn_from_get_free_fat_clusters:
   707 00006860 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors] ; Free clusters !
   708                              <1> retn_from_get_free_fat32_clusters:
   709 00006863 0FB65E13            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
   710 00006867 F7E3                <1>       	mul	ebx
   711                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Free sectors
   712                              <1> retn_get_free_sectors_calc:
   713 00006869 C3                  <1> 	retn
   714                              <1> 
   715                              <1> loc_gfc_free_fat_clusters_cont:
   716 0000686A 09C0                <1> 	or	eax, eax
   717 0000686C 7503                <1> 	jnz	short loc_gfc_pass_inc_free_cluster_count
   718 0000686E FF4674              <1> 	inc	dword [esi+LD_FreeSectors] ; Free clusters !
   719                              <1>    
   720                              <1> loc_gfc_pass_inc_free_cluster_count:
   721                              <1> 	;mov	eax, [FAT_CurrentCluster]
   722 00006871 89C8                <1> 	mov	eax, ecx ; [FAT_CurrentCluster]
   723 00006873 3B4678              <1> 	cmp	eax, [esi+LD_Clusters]
   724 00006876 77E8                <1> 	ja	short retn_from_get_free_fat_clusters
   725 00006878 40                  <1> 	inc	eax
   726                              <1> 	;mov	[FAT_CurrentCluster], eax
   727 00006879 EBDA                <1> 	jmp	short loc_gfc_loop_get_next_cluster
   728                              <1> 
   729                              <1> floppy_drv_init:
   730                              <1> 	; 06/07/2016
   731                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   732                              <1> 	; 24/07/2011
   733                              <1> 	; 04/07/2009
   734                              <1> 	; INPUT ->
   735                              <1> 	;	DL = Drive number (0,1)
   736                              <1> 	; OUTPUT ->
   737                              <1> 	;	BL = drive name
   738                              <1> 	;	BH = drive number
   739                              <1> 	;	ESI = Logical DOS drv description table
   740                              <1> 	;	EAX = Volume serial number
   741                              <1>  
   742 0000687B BE[565C0000]        <1> 	mov	esi, fd0_type ; 10/01/2016
   743 00006880 BF00010900          <1> 	mov	edi, Logical_DOSDisks
   744 00006885 08D2                <1> 	or	dl, dl
   745 00006887 7407                <1> 	jz	short loc_drv_init_fd0_fd1
   746 00006889 81C700010000        <1> 	add	edi, 100h
   747 0000688F 46                  <1> 	inc	esi ; fd1_type ; 10/01/2016
   748                              <1> loc_drv_init_fd0_fd1:
   749 00006890 C6477E00            <1> 	mov	byte [edi+LD_MediaChanged], 0
   750 00006894 803E01              <1> 	cmp	byte [esi], 1 ; type (>0 if it is existing) 
   751                              <1> 		; 4 = 1.44 MB, 80 track, 3 1/2"
   752 00006897 7221                <1> 	jb	short read_fd_boot_sector_retn
   753 00006899 885702              <1> 	mov	[edi+LD_PhyDrvNo], dl
   754                              <1> read_fd_boot_sector:
   755 0000689C 30F6                <1> 	xor	dh, dh
   756 0000689E B904000000          <1> 	mov	ecx, 4 ; Retry Count
   757                              <1> read_fd_boot_sector_again:
   758 000068A3 51                  <1> 	push 	ecx
   759                              <1> 	;mov	cx, 1
   760 000068A4 B101                <1> 	mov	cl, 1
   761 000068A6 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   762 000068AA BB[BA480100]        <1> 	mov	ebx, DOSBootSectorBuff
   763 000068AF E852D9FFFF          <1> 	call	int13h
   764 000068B4 59                  <1> 	pop	ecx
   765 000068B5 7304                <1> 	jnc	short use_fd_boot_sector_params
   766 000068B7 E2EA                <1> 	loop	read_fd_boot_sector_again
   767                              <1> 
   768                              <1> read_fd_boot_sector_stc_retn:
   769 000068B9 F9                  <1> 	stc
   770                              <1> read_fd_boot_sector_retn:
   771 000068BA C3                  <1> 	retn
   772                              <1> 
   773                              <1> use_fd_boot_sector_params:
   774                              <1> 	;mov	esi, DOSBootSectorBuff
   775 000068BB 89DE                <1> 	mov	esi, ebx
   776 000068BD 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   777 000068C6 75F1                <1> 	jne	short read_fd_boot_sector_stc_retn
   778 000068C8 66817E035346        <1>         cmp     word [esi+bs_FS_Identifier], 'SF'
   779 000068CE 0F85A2000000        <1>         jne     use_fd_fatfs_boot_sector_params
   780                              <1> 	;
   781 000068D4 8A462D              <1> 	mov	al, [esi+bs_FS_LBA_Ready]
   782 000068D7 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
   783                              <1> 	;
   784                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
   785 000068DA 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
   786 000068DD 884706              <1> 	mov	[edi+LD_FS_MediaAttrib], al
   787                              <1> 	;
   788 000068E0 8A460A              <1>         mov	al, [esi+bs_FS_VersionMaj]
   789 000068E3 884707              <1> 	mov	byte [edi+LD_FS_VersionMajor], al
   790 000068E6 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
   791 000068EA 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
   792 000068EE 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
   793 000068F1 6698                <1> 	cbw
   794 000068F3 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
   795 000068F7 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
   796                              <1> 	;cbw
   797 000068FA 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
   798                              <1> 	;
   799 000068FE 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
   800 00006901 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
   801 00006904 8B4618              <1> 	mov	eax, [esi+bs_FS_MATLocation]
   802 00006907 89470C              <1> 	mov	[edi+LD_FS_MATLocation], eax
   803 0000690A 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
   804 0000690D 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
   805 00006910 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
   806 00006913 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
   807 00006916 8B4610              <1> 	mov	eax, [esi+bs_FS_VolumeSize]
   808 00006919 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
   809                              <1> 	;		
   810 0000691C 89FE                <1> 	mov	esi, edi
   811 0000691E 8B460C              <1>  	mov	eax, [esi+LD_FS_MATLocation]
   812                              <1> 	;add	eax, [edi+LD_FS_BeginSector]
   813                              <1> read_fd_MAT_sector_again:
   814                              <1> 	;mov	ebx, DOSBootSectorBuff
   815                              <1> 	;mov	ecx, 1
   816 00006921 B101                <1> 	mov	cl, 1
   817 00006923 E8C7870000          <1> 	call	chs_read
   818 00006928 89DE                <1> 	mov	esi, ebx
   819 0000692A 7301                <1> 	jnc	short use_fdfs_mat_sector_params
   820                              <1> 	;jmp	short read_fd_boot_sector_retn
   821 0000692C C3                  <1> 	retn
   822                              <1> use_fdfs_mat_sector_params:
   823 0000692D 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
   824 00006930 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
   825 00006933 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
   826 00006936 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
   827 00006939 8B4714              <1> 	mov	eax, [edi+FS_MAT_FreeSectors]
   828 0000693C 894774              <1> 	mov	[edi+LD_FS_FreeSectors], eax
   829 0000693F 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
   830 00006942 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
   831                              <1> 	;
   832 00006945 89FE                <1> 	mov	esi, edi
   833 00006947 8B4608              <1>  	mov	eax, [esi+LD_FS_RootDirD]
   834                              <1> read_fd_RDT_sector_again:
   835                              <1> 	;mov	ebx, DOSBootSectorBuff
   836                              <1> 	;mov	cx, 1
   837 0000694A B101                <1> 	mov	cl, 1
   838 0000694C E89E870000          <1> 	call	chs_read
   839 00006951 89DE                <1> 	mov	esi, ebx
   840 00006953 7220                <1> 	jc	short read_fd_RDT_sector_retn
   841                              <1> use_fdfs_RDT_sector_params:
   842 00006955 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
   843 00006958 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
   844 0000695B 57                  <1> 	push	edi
   845                              <1> 	;mov	ecx, 16
   846 0000695C B110                <1> 	mov	cl, 16	
   847 0000695E 83C640              <1> 	add	esi, FS_RDT_VolumeName
   848 00006961 83C72C              <1> 	add	edi, LD_FS_VolumeName
   849 00006964 F3A5                <1> 	rep	movsd ; 64 bytes
   850 00006966 5E                  <1> 	pop	esi
   851 00006967 C6460300            <1> 	mov	byte [esi+LD_FATType], 0
   852 0000696B C64604A1            <1> 	mov	byte [esi+LD_FSType], 0A1h  
   853 0000696F E9A5000000          <1>         jmp     loc_cont_use_fd_boot_sector_params
   854                              <1> 
   855                              <1> read_fd_RDT_sector_stc_retn:
   856 00006974 F9                  <1> 	stc
   857                              <1> read_fd_RDT_sector_retn:
   858 00006975 C3                  <1> 	retn
   859                              <1> 
   860                              <1> use_fd_fatfs_boot_sector_params:
   861 00006976 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
   862 0000697A 75F8                <1> 	jne	short read_fd_RDT_sector_stc_retn
   863 0000697C 807E15F0            <1> 	cmp	byte [esi+BPB_Media], 0F0h
   864 00006980 72F3                <1> 	jb	short read_fd_RDT_sector_retn
   865 00006982 57                  <1> 	push	edi
   866 00006983 83C706              <1> 	add	edi, LD_BPB
   867                              <1> 	;mov	ecx, 16
   868 00006986 B110                <1> 	mov	cl, 16
   869 00006988 F3A5                <1> 	rep	movsd ; 64 bytes 
   870 0000698A 5E                  <1> 	pop	esi
   871 0000698B 31C0                <1> 	xor	eax, eax
   872 0000698D 89466C              <1> 	mov	[esi+LD_StartSector], eax ; 0
   873 00006990 668B461C            <1> 	mov	ax, [esi+LD_BPB+BPB_FATSz16]
   874 00006994 8A4E16              <1> 	mov	cl, [esi+LD_BPB+BPB_NumFATs] 
   875 00006997 F7E1                <1>   	mul	ecx
   876                              <1> 	; edx = 0 !
   877 00006999 668B5614            <1> 	mov	dx, [esi+LD_BPB+BPB_RsvdSecCnt]
   878 0000699D 66895660            <1> 	mov	[esi+LD_FATBegin], dx
   879                              <1> 	;add	eax, edx
   880 000069A1 6601D0              <1> 	add	ax, dx
   881 000069A4 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   882 000069A7 894668              <1> 	mov	[esi+LD_DATABegin], eax 
   883 000069AA 668B5617            <1> 	mov	dx, [esi+LD_BPB+BPB_RootEntCnt]
   884                              <1> 	;;shl	edx, 5 ; * 32 (Size of a directory entry)
   885                              <1> 	;shl	dx, 5
   886                              <1> 	;;add	edx, 511
   887                              <1> 	;add	dx, 511
   888                              <1> 	;;shr	edx, 9 ; edx = ((edx*32)+511) / 512
   889                              <1> 	;shr	dx, 9
   890 000069AE 6683C20F            <1> 	add	dx, 15 ; 06/07/2016 (+(512/32)-1)
   891 000069B2 66C1EA04            <1> 	shr	dx, 4 ; / 16 (==16 entries per sector)
   892 000069B6 015668              <1> 	add 	[esi+LD_DATABegin], edx ; + rd sectors
   893                              <1> 	;movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
   894 000069B9 668B4619            <1> 	mov	ax, [esi+LD_BPB+BPB_TotalSec16]
   895 000069BD 894670              <1> 	mov	[esi+LD_TotalSectors], eax
   896 000069C0 2B4668              <1> 	sub	eax, [esi+LD_DATABegin]
   897                              <1>   	;movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust]
   898 000069C3 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]  
   899 000069C6 80F901              <1> 	cmp	cl, 1
   900 000069C9 7605                <1> 	jna	short save_fd_fatfs_cluster_count
   901                              <1> 	;sub	edx, edx
   902 000069CB 6629D2              <1> 	sub	dx, dx ; 0
   903                              <1> 	;sub	dl, dl ; 06/07/2016
   904 000069CE F7F1                <1> 	div	ecx
   905                              <1> save_fd_fatfs_cluster_count:
   906 000069D0 894678              <1> 	mov	[esi+LD_Clusters], eax
   907                              <1> 
   908                              <1>       ; Maximum Valid Cluster Number = EAX +1
   909                              <1>       ; with 2 reserved clusters= EAX +2
   910                              <1>  
   911                              <1> reset_FAT_buffer_decriptors:
   912 000069D3 29C0                <1> 	sub	eax, eax ; 0  
   913 000069D5 A2[BE4A0100]        <1> 	mov	[FAT_BuffValidData], al ; 0
   914 000069DA A2[BF4A0100]        <1> 	mov	[FAT_BuffDrvName], al ; 0
   915 000069DF A3[C24A0100]        <1> 	mov	[FAT_BuffSector], eax ; 0
   916                              <1> 
   917                              <1> read_fd_FAT_sectors:
   918 000069E4 BB001C0900          <1>   	mov	ebx, FAT_Buffer
   919 000069E9 668B4614            <1> 	mov	ax, [esi+LD_BPB+BPB_RsvdSecCnt]
   920                              <1> 	;mov	ecx, 3
   921 000069ED B103                <1> 	mov	cl, 3 ; 3 sectors
   922 000069EF E8FB860000          <1> 	call	chs_read
   923 000069F4 7240                <1> 	jc	short read_fd_FAT_sectors_retn
   924                              <1> use_fd_FAT_sectors:
   925 000069F6 8A4602              <1> 	mov	al, [esi+LD_PhyDrvNo]
   926 000069F9 0441                <1> 	add	al, 'A' 
   927 000069FB A2[BF4A0100]        <1> 	mov	[FAT_BuffDrvName], al 
   928 00006A00 C605[BE4A0100]01    <1>  	mov	byte [FAT_BuffValidData], 1
   929 00006A07 E82B000000          <1> 	call	fd_init_calculate_free_clusters
   930 00006A0C 7228                <1> 	jc	short read_fd_FAT_sectors_retn
   931                              <1>   
   932                              <1> loc_use_fd_boot_sector_params_FAT:
   933 00006A0E C6460301            <1> 	mov	byte [esi+LD_FATType], 1 ; FAT 12
   934 00006A12 C6460401            <1> 	mov	byte [esi+LD_FSType], 1
   935 00006A16 8B462D              <1>         mov     eax, [esi+LD_BPB+VolumeID]
   936                              <1> loc_cont_use_fd_boot_sector_params:
   937 00006A19 8A7E02              <1> 	mov	bh, [esi+LD_PhyDrvNo]
   938 00006A1C 887E7D              <1> 	mov	[esi+LD_DParamEntry], bh
   939 00006A1F 88FB                <1> 	mov	bl, bh
   940 00006A21 80C341              <1> 	add	bl, 'A'
   941 00006A24 881E                <1> 	mov	byte [esi+LD_Name], bl
   942 00006A26 C6460101            <1> 	mov	byte [esi+LD_DiskType], 1
   943 00006A2A C6460500            <1> 	mov	byte [esi+LD_LBAYes], 0
   944 00006A2E C6467C00            <1> 	mov	byte [esi+LD_PartitionEntry], 0
   945 00006A32 C6467E06            <1> 	mov	byte [esi+LD_MediaChanged], 6 ; Volume Name Reset
   946                              <1> 
   947                              <1> read_fd_FAT_sectors_retn:
   948 00006A36 C3                  <1> 	retn   
   949                              <1> 
   950                              <1> fd_init_calculate_free_clusters:
   951                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   952                              <1> 	; 04/07/2009
   953                              <1> 	; INPUT ->
   954                              <1> 	;     ESI = Logical DOS drive description table address
   955                              <1> 	; OUTPUT ->
   956                              <1> 	;    [ESI+LD_FreeSectors] will be set
   957                              <1> 	
   958 00006A37 29C0                <1> 	sub	eax, eax
   959 00006A39 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; 0
   960 00006A3C B002                <1> 	mov	al, 2 ; eax = 2
   961                              <1> 
   962                              <1> fd_init_loop_get_next_cluster:
   963 00006A3E E830000000          <1> 	call	fd_init_get_next_cluster
   964 00006A43 722D                <1> 	jc	short fd_init_calculate_free_clusters_retn
   965                              <1> 
   966                              <1> fd_init_free_fat_clusters:
   967                              <1> 	;cmp 	eax, 0
   968                              <1> 	;ja	short fd_init_pass_inc_free_cluster_count
   969                              <1> 	;and	eax, eax
   970                              <1> 	;jnz	short fd_init_pass_inc_free_cluster_count
   971 00006A45 6621C0              <1> 	and	ax, ax
   972 00006A48 7504                <1> 	jnz	short fd_init_pass_inc_free_cluster_count
   973                              <1> 	;inc	dword [esi+LD_FreeSectors]
   974 00006A4A 66FF4674            <1>         inc	word [esi+LD_FreeSectors]
   975                              <1>     
   976                              <1> fd_init_pass_inc_free_cluster_count:
   977                              <1>   	;mov	eax, [FAT_CurrentCluster]
   978 00006A4E 66A1[BA4A0100]      <1> 	mov	ax, [FAT_CurrentCluster]
   979                              <1> 	;cmp	eax, [esi+LD_Clusters]
   980 00006A54 663B4678            <1> 	cmp	ax, [esi+LD_Clusters]
   981 00006A58 7704                <1> 	ja	short short retn_from_fd_init_calculate_free_clusters
   982                              <1> 	;inc	eax
   983 00006A5A 6640                <1> 	inc	ax
   984 00006A5C EBE0                <1> 	jmp	short fd_init_loop_get_next_cluster
   985                              <1> 
   986                              <1> retn_from_fd_init_calculate_free_clusters:
   987 00006A5E 8A4613              <1>   	mov	al, [esi+LD_BPB+BPB_SecPerClust]
   988 00006A61 3C01                <1>   	cmp	al, 1
   989 00006A63 760D                <1> 	jna	short fd_init_calculate_free_clusters_retn
   990                              <1> 	;movzx	eax, al
   991 00006A65 6698                <1> 	cbw
   992                              <1> 	;mov	ecx, [esi+LD_FreeSectors]
   993 00006A67 668B4E74            <1> 	mov	cx, [esi+LD_FreeSectors] ; Count of free clusters
   994                              <1>   	;mul	ecx
   995 00006A6B 66F7E1              <1> 	mul	cx
   996                              <1> 	;mov	[esi+LD_FreeSectors], eax
   997 00006A6E 66894674            <1> 	mov	[esi+LD_FreeSectors], ax
   998                              <1> fd_init_calculate_free_clusters_retn:
   999 00006A72 C3                  <1> 	retn
  1000                              <1> 
  1001                              <1> fd_init_get_next_cluster:
  1002                              <1> 	; 04/02/2016
  1003                              <1> 	; 02/02/2016
  1004                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1005                              <1> 	; 04/07/2009
  1006                              <1> 	; INPUT ->
  1007                              <1> 	;    EAX = Current cluster
  1008                              <1> 	;    ESI = Logical DOS drive description table address
  1009                              <1> 	;    EDX = 0
  1010                              <1> 	; OUTPUT ->
  1011                              <1> 	;    EAX = Next cluster
  1012                              <1> 
  1013 00006A73 A3[BA4A0100]        <1> 	mov	[FAT_CurrentCluster], eax
  1014                              <1> fd_init_get_next_cluster_readnext:
  1015 00006A78 29D2                <1> 	sub	edx, edx ; 0
  1016 00006A7A BB00040000          <1>   	mov	ebx, 1024 ; 400h
  1017 00006A7F F7F3                <1>   	div	ebx
  1018                              <1>   	; EAX = Count of 3 FAT sectors
  1019                              <1>   	; EDX = Buffer entry index
  1020 00006A81 89C1                <1> 	mov	ecx, eax
  1021                              <1> 	;mov	eax, 3
  1022 00006A83 B003                <1> 	mov	al, 3
  1023 00006A85 F7E2                <1> 	mul	edx ; Multiply by 3
  1024 00006A87 66D1E8              <1> 	shr	ax, 1 ; Divide by 2
  1025 00006A8A 89C3                <1> 	mov	ebx, eax ; Buffer byte offset
  1026 00006A8C 81C3001C0900        <1> 	add	ebx, FAT_Buffer
  1027 00006A92 89C8                <1> 	mov	eax, ecx
  1028                              <1> 	;mov	edx, 3
  1029 00006A94 66BA0300            <1> 	mov	dx, 3
  1030 00006A98 F7E2                <1> 	mul	edx 
  1031                              <1>   	; EAX = FAT Beginning Sector
  1032                              <1> 	; EDX = 0
  1033 00006A9A 8A0E                <1> 	mov	cl, [esi+LD_Name]
  1034                              <1> 	;cmp	byte [FAT_BuffValidData], 0
  1035                              <1> 	;jna	short fd_init_load_FAT_sectors0
  1036 00006A9C 3A0D[BF4A0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
  1037 00006AA2 751E                <1> 	jne	short fd_init_load_FAT_sectors0
  1038 00006AA4 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
  1039 00006AAA 751C                <1> 	jne	short fd_init_load_FAT_sectors1
  1040                              <1> 	;mov	eax, [FAT_CurrentCluster]
  1041 00006AAC A0[BA4A0100]        <1> 	mov	al, [FAT_CurrentCluster]
  1042                              <1> 	;shr	eax, 1
  1043 00006AB1 D0E8                <1> 	shr	al, 1
  1044 00006AB3 668B03              <1> 	mov	ax, [ebx]
  1045 00006AB6 7306                <1>   	jnc	short fd_init_gnc_even
  1046 00006AB8 66C1E804            <1> 	shr	ax, 4
  1047                              <1> fd_init_gnc_clc_retn:
  1048 00006ABC F8                  <1> 	clc
  1049 00006ABD C3                  <1> 	retn
  1050                              <1> 
  1051                              <1> fd_init_gnc_even:
  1052 00006ABE 80E40F              <1> 	and	ah, 0Fh
  1053 00006AC1 C3                  <1> 	retn
  1054                              <1> 
  1055                              <1> fd_init_load_FAT_sectors0:
  1056 00006AC2 880D[BF4A0100]      <1> 	mov 	[FAT_BuffDrvName], cl
  1057                              <1> fd_init_load_FAT_sectors1:
  1058 00006AC8 C605[BE4A0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1059 00006ACF A3[C24A0100]        <1> 	mov	[FAT_BuffSector], eax
  1060 00006AD4 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1061 00006AD7 BB001C0900          <1>  	mov	ebx, FAT_Buffer
  1062                              <1> 	;movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
  1063 00006ADC 668B4E1C            <1> 	mov	cx, [esi+LD_BPB+BPB_FATSz16]
  1064 00006AE0 662B0D[C24A0100]    <1> 	sub	cx, [FAT_BuffSector]
  1065                              <1>         ;cmp	ecx, 3
  1066 00006AE7 6683F903            <1> 	cmp	cx, 3
  1067 00006AEB 7605                <1> 	jna	short fdinit_pass_fix_sector_count_3
  1068                              <1> 	;mov	ecx, 3
  1069 00006AED B903000000          <1> 	mov	ecx, 3
  1070                              <1> fdinit_pass_fix_sector_count_3:  
  1071 00006AF2 E8F8850000          <1> 	call	chs_read
  1072 00006AF7 730D                <1> 	jnc	short fd_init_FAT_sectors_no_load_error
  1073 00006AF9 C605[BE4A0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1074                              <1> 		; Drv not ready or read Error !
  1075 00006B00 B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; 15
  1076                              <1> 	;xor	edx, edx
  1077 00006B05 C3                  <1> 	retn
  1078                              <1> 
  1079                              <1> fd_init_FAT_sectors_no_load_error:
  1080 00006B06 C605[BE4A0100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1081 00006B0D A1[BA4A0100]        <1> 	mov	eax, [FAT_CurrentCluster]
  1082 00006B12 E961FFFFFF          <1>         jmp     fd_init_get_next_cluster_readnext
  1083                              <1> 
  1084                              <1> get_FAT_volume_name:
  1085                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1086                              <1> 	; 12/09/2009
  1087                              <1> 	; INPUT ->
  1088                              <1> 	;	BH = Logical DOS drive number (0,1,2,3,4 ...)
  1089                              <1> 	;       BL = 0
  1090                              <1> 	; OUTPUT ->
  1091                              <1> 	;	CF = 0 -> ESI = Volume name address
  1092                              <1> 	; 	CF = 1 -> Root volume name not found
  1093                              <1> 
  1094                              <1> 	;mov 	ah, 0FFh
  1095                              <1> 	;mov 	al, [Last_Dos_DiskNo]
  1096                              <1> 	;cmp 	al, bh
  1097                              <1> 	;jb     short loc_gfvn_dir_load_err
  1098                              <1> 
  1099 00006B17 89DE                <1> 	mov	esi, ebx
  1100 00006B19 81E600FF0000        <1> 	and	esi, 0FF00h ; esi = bh
  1101 00006B1F 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1102 00006B25 8A06                <1> 	mov     al, [esi+LD_Name]
  1103 00006B27 8A6603              <1> 	mov     ah, [esi+LD_FATType]
  1104 00006B2A 80FC01              <1> 	cmp     ah, 1
  1105 00006B2D 7210                <1> 	jb    	short loc_gfvn_dir_load_err
  1106 00006B2F 3C41                <1> 	cmp 	al, 'A'
  1107 00006B31 720C                <1> 	jb      short loc_gfvn_dir_load_err
  1108 00006B33 80FC02              <1> 	cmp 	ah, 2 
  1109 00006B36 7708                <1> 	ja      short get_FAT32_root_cluster
  1110                              <1> 	
  1111 00006B38 E89B4E0000          <1> 	call    load_FAT_root_directory
  1112 00006B3D 730B                <1> 	jnc     short loc_get_volume_name
  1113                              <1> 
  1114                              <1> loc_gfvn_dir_load_err:
  1115 00006B3F C3                  <1> 	retn
  1116                              <1> 
  1117                              <1> get_FAT32_root_cluster:
  1118 00006B40 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
  1119 00006B43 E81B4F0000          <1> 	call    load_FAT_sub_directory
  1120 00006B48 7224                <1> 	jc	short loc_get_volume_name_retn
  1121                              <1> 
  1122                              <1> loc_get_volume_name:
  1123 00006B4A BE00000800          <1>         mov     esi, Directory_Buffer
  1124 00006B4F 6631C9              <1> 	xor	cx, cx ; 0
  1125                              <1> check_root_volume_name:
  1126 00006B52 8A06                <1> 	mov	al, [esi]
  1127 00006B54 08C0                <1> 	or      al, al
  1128 00006B56 7416                <1> 	jz      short loc_get_volume_name_retn
  1129 00006B58 807E0B08            <1> 	cmp     byte [esi+0Bh], 08h
  1130 00006B5C 7410                <1> 	je      short loc_get_volume_name_retn
  1131 00006B5E 663B0D[D34A0100]    <1> 	cmp     cx, [DirBuff_LastEntry]
  1132 00006B65 7308                <1> 	jnb     short pass_check_root_volume_name
  1133 00006B67 6641                <1> 	inc     cx
  1134 00006B69 83C620              <1> 	add     esi, 32
  1135 00006B6C EBE4                <1> 	jmp     short check_root_volume_name
  1136                              <1> 
  1137                              <1> loc_get_volume_name_retn:
  1138 00006B6E C3                  <1> 	retn
  1139                              <1>     
  1140                              <1> pass_check_root_volume_name:
  1141 00006B6F 803D[CF4A0100]03    <1> 	cmp	byte [DirBuff_FATType], 3
  1142 00006B76 7230                <1> 	jb	short loc_get_volume_name_retn_xor
  1143                              <1> 
  1144 00006B78 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1145 00006B7D BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1146 00006B82 31C0                <1> 	xor	eax, eax
  1147 00006B84 8A25[CE4A0100]      <1> 	mov	ah, [DirBuff_DRV]
  1148 00006B8A 80EC41              <1> 	sub	ah, 'A' 
  1149 00006B8D 01C6                <1> 	add	esi, eax
  1150 00006B8F A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
  1151 00006B94 E8E44C0000          <1> 	call	get_next_cluster
  1152 00006B99 7305                <1> 	jnc 	short loc_gfvn_load_FAT32_dir_cluster
  1153                              <1>   	
  1154 00006B9B 83F801              <1> 	cmp     eax, 1
  1155 00006B9E F5                  <1> 	cmc
  1156 00006B9F C3                  <1> 	retn
  1157                              <1>   
  1158                              <1> loc_gfvn_load_FAT32_dir_cluster:
  1159 00006BA0 E8BE4E0000          <1> 	call	load_FAT_sub_directory
  1160 00006BA5 73A3                <1> 	jnc	short loc_get_volume_name
  1161 00006BA7 C3                  <1> 	retn
  1162                              <1> 
  1163                              <1> loc_get_volume_name_retn_xor:
  1164 00006BA8 31C0                <1> 	xor 	eax, eax
  1165 00006BAA C3                  <1> 	retn
  1166                              <1> 
  1167                              <1> get_media_change_status:
  1168                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1169                              <1> 	; 09/09/2009
  1170                              <1> 	; INPUT:
  1171                              <1> 	;     DL = Drive number (physical)
  1172                              <1> 	; OUTPUT: clc & AH = 6 media changed
  1173                              <1> 	;     clc & AH = 0 media not changed         
  1174                              <1> 	;     stc -> Drive not ready or an error 
  1175                              <1>   
  1176 00006BAB B416                <1> 	mov	ah, 16h
  1177 00006BAD E854D6FFFF          <1>   	call	int13h
  1178 00006BB2 80FC06              <1> 	cmp	ah, 06h
  1179 00006BB5 7405                <1> 	je	short loc_gmc_status_retn
  1180 00006BB7 08E4                <1> 	or	ah, ah
  1181 00006BB9 7401                <1> 	jz	short loc_gmc_status_retn
  1182                              <1> loc_gmc_status_stc_retn:    
  1183 00006BBB F9                  <1> 	stc
  1184                              <1> loc_gmc_status_retn:
  1185 00006BBC C3                  <1> 	retn
  2306                                  %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: 07/01/2017
     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 00006BBD 31DB                <1> 	xor	ebx, ebx
    34 00006BBF 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 00006BC1 BE00010900          <1> 	mov	esi, Logical_DOSDisks
    43 00006BC6 01DE                <1> 	add	esi, ebx
    44                              <1> loc_ccdrv_dos_drive_name_check:
    45 00006BC8 80FA02              <1> 	cmp	dl, 2
    46 00006BCB 720F                <1> 	jb	short loc_ccdrv_dos_drive_name_check_ok
    47                              <1> 
    48 00006BCD 8A06                <1> 	mov	al, [esi+LD_Name]
    49 00006BCF 2C41                <1> 	sub	al, 'A'
    50 00006BD1 38D0                <1> 	cmp	al, dl
    51 00006BD3 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 00006BD5 B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    56                              <1> loc_change_current_drive_stc_retn:
    57 00006BDA F9                  <1> 	stc
    58 00006BDB C3                  <1> 	retn  
    59                              <1> 
    60                              <1> loc_ccdrv_dos_drive_name_check_ok:
    61 00006BDC 8A667E              <1> 	mov	ah, [esi+LD_MediaChanged]
    62 00006BDF 80FC06              <1> 	cmp	ah, 6  ; VOLUME NAME CHECK/MOVE SIGN
    63 00006BE2 7455                <1> 	je	short loc_ccdrv_get_FAT_volume_name_0
    64                              <1> 
    65 00006BE4 80FA01              <1> 	cmp	dl, 1
    66 00006BE7 777D                <1> 	ja	short loc_gmcs_init_drv_hd
    67                              <1> 
    68                              <1> loc_gmcs_init_drv_fd:
    69 00006BE9 08E4                <1> 	or	ah, ah 
    70                              <1> 	; AH = 1 is initialization sign (invalid_fd_parameter)
    71 00006BEB 7517                <1> 	jnz	short loc_ccdrv_call_fd_init
    72                              <1> 
    73 00006BED E8B9FFFFFF          <1> 	call	get_media_change_status
    74 00006BF2 72E1                <1> 	jc	short loc_ccdrv_drive_not_ready_err
    75                              <1> 
    76 00006BF4 20E4                <1> 	and	ah, ah
    77 00006BF6 7476                <1> 	jz	short loc_change_current_drv3
    78                              <1> 
    79 00006BF8 80F406              <1> 	xor	ah, 6
    80 00006BFB 75D8                <1> 	jnz	short loc_ccdrv_drive_not_ready_err
    81                              <1> 
    82                              <1> loc_ccdrv_call_fd_init_check_vol_id:
    83 00006BFD E8490A0000          <1> 	call	get_volume_serial_number
    84 00006C02 730D                <1> 	jnc	short loc_ccdrv_check_vol_serial
    85                              <1> 
    86                              <1> loc_ccdrv_call_fd_init:
    87 00006C04 E872FCFFFF          <1> 	call	floppy_drv_init
    88 00006C09 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 00006C0B B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    93 00006C10 C3                  <1> 	retn
    94                              <1> 
    95                              <1> loc_ccdrv_check_vol_serial:
    96 00006C11 A3[9C420100]        <1> 	mov	[Current_VolSerial], eax
    97                              <1> 	;mov	dl, bh
    98 00006C16 E860FCFFFF          <1> 	call	floppy_drv_init
    99 00006C1B 72EE                <1> 	jc	short loc_ccdrv_fdinit_fail_retn
   100                              <1> 
   101 00006C1D 3B05[9C420100]      <1> 	cmp	eax, [Current_VolSerial]
   102 00006C23 7445                <1> 	je	short loc_change_current_drv2
   103                              <1> 
   104                              <1> loc_reset_drv_fd_current_dir:
   105 00006C25 31C0                <1> 	xor	eax, eax              
   106 00006C27 88467F              <1>         mov	[esi+LD_CDirLevel], al
   107 00006C2A 89F7                <1> 	mov	edi, esi
   108 00006C2C 81C780000000        <1> 	add	edi, LD_CurrentDirectory
   109 00006C32 B920000000          <1> 	mov	ecx, 32
   110 00006C37 F3AB                <1> 	rep	stosd   
   111                              <1>  
   112                              <1> loc_ccdrv_get_FAT_volume_name_0:
   113 00006C39 8A4603              <1> 	mov	al, [esi+LD_FATType]
   114 00006C3C 08C0                <1> 	or	al, al
   115 00006C3E 742A                <1> 	jz	short loc_change_current_drv2
   116                              <1> 
   117 00006C40 56                  <1> 	push	esi 
   118 00006C41 3C02                <1> 	cmp	al, 2
   119 00006C43 7705                <1> 	ja	short loc_ccdrv_get_FAT32_vol_name
   120                              <1>              
   121                              <1> loc_ccdrv_get_FAT2_16_vol_name:
   122 00006C45 83C631              <1> 	add	esi, LD_BPB + VolumeLabel
   123 00006C48 EB03                <1> 	jmp	short loc_ccdrv_get_FAT_volume_name_1
   124                              <1> 
   125                              <1> loc_ccdrv_get_FAT32_vol_name:
   126 00006C4A 83C64D              <1> 	add	esi, LD_BPB + FAT32_VolLab
   127                              <1> loc_ccdrv_get_FAT_volume_name_1:
   128 00006C4D 53                  <1> 	push	ebx
   129 00006C4E 56                  <1> 	push	esi
   130 00006C4F E8C3FEFFFF          <1> 	call	get_FAT_volume_name
   131 00006C54 5F                  <1> 	pop	edi
   132 00006C55 5B                  <1> 	pop	ebx
   133                              <1> 	; BL = 0
   134 00006C56 720B                <1> 	jc	short loc_change_current_drv1
   135 00006C58 20C0                <1> 	and	al, al
   136 00006C5A 7407                <1> 	jz	short loc_change_current_drv1
   137                              <1> 
   138                              <1> loc_ccdrv_move_FAT_volume_name:
   139 00006C5C B90B000000          <1> 	mov	ecx, 11
   140 00006C61 F3A4                <1> 	rep	movsb
   141                              <1> 
   142                              <1> loc_change_current_drv1:
   143 00006C63 5E                  <1> 	pop	esi
   144 00006C64 EB04                <1> 	jmp	short loc_change_current_drv2
   145                              <1> 
   146                              <1> loc_gmcs_init_drv_hd:
   147 00006C66 08E4                <1> 	or	ah, ah
   148 00006C68 7404                <1> 	jz	short loc_change_current_drv3
   149                              <1> 	; BL = 0, BH = Logical DOS drive number
   150                              <1> loc_change_current_drv2:
   151 00006C6A C6467E00            <1> 	mov	byte [esi+LD_MediaChanged], 0
   152                              <1> loc_change_current_drv3:
   153 00006C6E 883D[A6420100]      <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 00006C74 8A4603              <1> 	mov	al, [esi+LD_FATType]
   172 00006C77 A2[A5420100]        <1> 	mov	[Current_FATType], al
   173                              <1> 
   174 00006C7C 8A26                <1> 	mov	ah, [esi+LD_Name] 
   175 00006C7E 8825[A7420100]      <1> 	mov	[Current_Dir_Drv], ah
   176                              <1> 
   177 00006C84 20C0                <1> 	and	al, al
   178 00006C86 741D                <1> 	jz	short loc_restore_FS_current_directory
   179                              <1> 
   180                              <1> loc_restore_FAT_current_directory:
   181 00006C88 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   182 00006C8B 8825[A4420100]      <1> 	mov	[Current_Dir_Level], ah
   183 00006C91 08E4                <1> 	or	ah, ah
   184 00006C93 7416                <1>         jz	short loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster
   185                              <1> 
   186 00006C95 0FB6D4              <1> 	movzx	edx, ah
   187 00006C98 C0E204              <1> 	shl	dl, 4 ; * 16
   188 00006C9B 01F2                <1>         add	edx, esi
   189 00006C9D 8B828C000000        <1> 	mov	eax, [edx+LD_CurrentDirectory+12]
   190 00006CA3 EB2C                <1> 	jmp	short loc_ccdrv_reset_cdir_FAT_fcluster
   191                              <1> 
   192                              <1> loc_restore_FS_current_directory:
   193 00006CA5 E8F44D0000          <1> 	call	load_current_FS_directory 
   194 00006CAA C3                  <1> 	retn 
   195                              <1> 
   196                              <1> loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster:
   197 00006CAB 3C03                <1> 	cmp	al, 3
   198 00006CAD 7205                <1> 	jb	short loc_ccdrv_reset_cdir_FAT_12_16_fcluster
   199                              <1> loc_ccdrv_reset_cdir_FAT32_fcluster:
   200 00006CAF 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   201 00006CB2 EB04                <1> 	jmp	short loc_ccdrv_check_rootdir_sign
   202                              <1> loc_ccdrv_reset_cdir_FAT_12_16_fcluster:   
   203 00006CB4 30C0                <1> 	xor	al, al  ; xor eax, eax
   204 00006CB6 31D2                <1> 	xor	edx, edx
   205                              <1> loc_ccdrv_check_rootdir_sign:
   206 00006CB8 80BE8000000000      <1> 	cmp	byte [esi+LD_CurrentDirectory], 0
   207 00006CBF 7510                <1> 	jne	short loc_ccdrv_reset_cdir_FAT_fcluster
   208                              <1> loc_ccdrv_set_rootdir_FAT_fcluster:
   209 00006CC1 89868C000000        <1>         mov     [esi+LD_CurrentDirectory+12], eax
   210 00006CC7 C78680000000524F4F- <1> 	mov	dword [esi+LD_CurrentDirectory], 'ROOT'
   210 00006CD0 54                  <1>
   211                              <1> 
   212                              <1> loc_ccdrv_reset_cdir_FAT_fcluster:
   213 00006CD1 A3[A0420100]        <1> 	mov	[Current_Dir_FCluster], eax
   214                              <1> 
   215 00006CD6 BF[074B0100]        <1> 	mov	edi, PATH_Array
   216 00006CDB 89F2                <1> 	mov	edx, esi
   217 00006CDD 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   218 00006CE3 B920000000          <1> 	mov	ecx, 32
   219 00006CE8 F3A5                <1> 	rep	movsd
   220                              <1> 
   221 00006CEA E8832D0000          <1> 	call	change_prompt_dir_string
   222                              <1> 	
   223 00006CEF 89D6                <1> 	mov	esi, edx
   224                              <1> 	
   225 00006CF1 29C0                <1>         sub	eax, eax
   226                              <1>        ;sub	edx, edx
   227 00006CF3 BF[A7420100]        <1> 	mov	edi, Current_Dir_Drv
   228                              <1> 
   229 00006CF8 A2[E3FE0000]        <1> 	mov	[Restore_CDIR], al ; 0
   230 00006CFD 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 00006CFE C705[644F0100]-     <1> 	mov	dword [mainprog_return_addr], return_from_cmd_interpreter
   242 00006D04 [B26D0000]          <1>
   243                              <1> 
   244                              <1> loc_TRDOS_prompt:
   245 00006D08 BF[A6430100]        <1> 	mov	edi, TextBuffer
   246 00006D0D C6075B              <1> 	mov	byte [edi], "["
   247 00006D10 47                  <1> 	inc	edi
   248 00006D11 BE[36FF0000]        <1> 	mov	esi, TRDOSPromptLabel
   249                              <1> get_next_prompt_label_char:
   250 00006D16 803E20              <1> 	cmp	byte [esi], 20h
   251 00006D19 7203                <1> 	jb	short pass_prompt_label
   252 00006D1B A4                  <1> 	movsb
   253 00006D1C EBF8                <1> 	jmp	short get_next_prompt_label_char
   254                              <1> pass_prompt_label:
   255 00006D1E C6075D              <1> 	mov	byte [edi], "]"
   256 00006D21 47                  <1> 	inc	edi
   257 00006D22 C60720              <1> 	mov	byte [edi], 20h
   258 00006D25 47                  <1> 	inc	edi
   259 00006D26 BE[A7420100]        <1> 	mov	esi, Current_Dir_Drv
   260 00006D2B 66A5                <1> 	movsw
   261 00006D2D A4                  <1> 	movsb 
   262                              <1> loc_prompt_current_directory:
   263 00006D2E 803E20              <1> 	cmp	byte [esi], 20h
   264 00006D31 7203                <1> 	jb	short pass_prompt_current_directory
   265 00006D33 A4                  <1> 	movsb
   266 00006D34 EBF8                <1> 	jmp	short loc_prompt_current_directory  
   267                              <1> pass_prompt_current_directory:
   268 00006D36 C6073E              <1> 	mov	byte [edi], '>'
   269 00006D39 47                  <1> 	inc	edi
   270 00006D3A C60700              <1> 	mov	byte [edi], 0  
   271 00006D3D BE[A6430100]        <1> 	mov	esi, TextBuffer
   272 00006D42 E876F5FFFF          <1> 	call	print_msg
   273                              <1>         
   274                              <1> 	;sub	bh, bh ; video page = 0
   275                              <1> 	;call	get_cpos ; get cursor position
   276 00006D47 668B15[FE410100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   277 00006D4E 8815[06430100]      <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 00006D54 E899000000          <1> 	call	rw_char
   297                              <1> loc_move_command:
   298 00006D59 BE[56430100]        <1> 	mov	esi, CommandBuffer
   299 00006D5E 89F7                <1> 	mov	edi, esi
   300 00006D60 31C9                <1> 	xor	ecx, ecx
   301                              <1> first_command_char:
   302 00006D62 AC                  <1> 	lodsb
   303 00006D63 3C20                <1> 	cmp	al, 20h
   304 00006D65 772E                <1> 	ja	short pass_space_control
   305 00006D67 7241                <1> 	jb	short loc_move_cmd_arguments_ok
   306 00006D69 81FE[A5430100]      <1> 	cmp	esi, CommandBuffer + 79
   307 00006D6F 72F1                <1> 	jb	short first_command_char
   308 00006D71 EB37                <1> 	jmp	short loc_move_cmd_arguments_ok
   309                              <1> 
   310                              <1> next_command_char:
   311 00006D73 AC                  <1> 	lodsb
   312 00006D74 3C20                <1> 	cmp	al, 20h
   313 00006D76 771D                <1> 	ja	short pass_space_control
   314 00006D78 7230                <1> 	jb	short loc_move_cmd_arguments_ok
   315                              <1> 
   316                              <1> loc_1st_cmd_arg: ; 30/01/2016
   317 00006D7A AC                  <1> 	lodsb
   318 00006D7B 3C20                <1> 	cmp	al, 20h
   319 00006D7D 74FB                <1> 	je	short loc_1st_cmd_arg
   320 00006D7F 7229                <1> 	jb	short loc_move_cmd_arguments_ok
   321                              <1> 	
   322 00006D81 C60700              <1>         mov     byte [edi], 0
   323 00006D84 47                  <1> 	inc	edi
   324                              <1> 
   325                              <1> loc_move_cmd_arguments:
   326 00006D85 AA                  <1> 	stosb
   327 00006D86 81FE[A5430100]      <1> 	cmp	esi, CommandBuffer + 79
   328 00006D8C 731C                <1> 	jnb	short loc_move_cmd_arguments_ok
   329 00006D8E AC                  <1>         lodsb
   330 00006D8F 3C20                <1> 	cmp	al, 20h
   331 00006D91 73F2                <1> 	jnb	short loc_move_cmd_arguments
   332 00006D93 EB15                <1> 	jmp	short loc_move_cmd_arguments_ok
   333                              <1> 
   334                              <1> pass_space_control:
   335 00006D95 3C61                <1> 	cmp	al, 61h
   336 00006D97 7206                <1> 	jb	short pass_capitalize
   337 00006D99 3C7A                <1> 	cmp	al, 7Ah
   338 00006D9B 7702                <1> 	ja	short pass_capitalize
   339 00006D9D 24DF                <1> 	and	al, 0DFh
   340                              <1> pass_capitalize:
   341 00006D9F AA                  <1> 	stosb   
   342 00006DA0 FEC1                <1> 	inc     cl
   343 00006DA2 81FE[A5430100]      <1>         cmp     esi, CommandBuffer + 79
   344 00006DA8 72C9                <1> 	jb      short next_command_char 
   345                              <1> 
   346                              <1> loc_move_cmd_arguments_ok:
   347 00006DAA C60700              <1>         mov     byte [edi], 0
   348                              <1> 
   349                              <1> call_command_interpreter:
   350 00006DAD E8D4080000          <1> 	call    command_interpreter
   351                              <1> 
   352                              <1> return_from_cmd_interpreter:
   353 00006DB2 B950000000          <1>         mov	ecx, 80
   354                              <1> 	;mov	cx, 80
   355 00006DB7 BF[56430100]        <1> 	mov	edi, CommandBuffer
   356 00006DBC 30C0                <1> 	xor	al, al
   357 00006DBE 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 00006DC0 803D[225E0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80*25 color
   363 00006DC7 741D                <1> 	je	short pass_set_txt_mode
   364                              <1> 
   365 00006DC9 E895A7FFFF          <1> 	call	set_txt_mode ; set vide mode to 03h
   366                              <1> 	; 07/01/2017
   367 00006DCE 30C0                <1> 	xor	al, al
   368                              <1> 
   369                              <1> loc_check_active_page:
   370                              <1> 	;xor	al, al
   371 00006DD0 3805[0E420100]      <1> 	cmp	[ACTIVE_PAGE], al ; 0
   372 00006DD6 0F842CFFFFFF        <1>         je      loc_TRDOS_prompt 
   373                              <1> 	; AL = 0 = video page 0
   374 00006DDC E89BABFFFF          <1> 	call	set_active_page
   375 00006DE1 E922FFFFFF          <1>         jmp     loc_TRDOS_prompt ; infinitive loop
   376                              <1> 
   377                              <1> pass_set_txt_mode: 
   378 00006DE6 BE[4F0B0100]        <1> 	mov	esi, nextline
   379 00006DEB E8CDF4FFFF          <1> 	call	print_msg
   380 00006DF0 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 00006DF2 30E4                <1> 	xor     ah, ah
   396 00006DF4 E81D9EFFFF          <1> 	call	int16h
   397 00006DF9 20C0                <1> 	and	al, al
   398 00006DFB 7434                <1> 	jz	short loc_arrow    
   399 00006DFD 3CE0                <1> 	cmp	al, 0E0h          
   400 00006DFF 7430                <1> 	je	short loc_arrow
   401 00006E01 3C08                <1> 	cmp	al, 08h             
   402 00006E03 7544                <1> 	jne	short char_return
   403                              <1> loc_back:
   404 00006E05 3A15[06430100]      <1> 	cmp	dl, [CursorColumn]
   405 00006E0B 76E5                <1> 	jna     short readnextchar
   406                              <1> prev_column:
   407 00006E0D FECA                <1> 	dec	dl
   408                              <1> set_cursor_pos:
   409 00006E0F 6652                <1> 	push	dx
   410                              <1> 	;xor	bh, bh ; 0 = video page 0
   411                              <1> 	; DH = Row, DL = Column
   412 00006E11 E832AFFFFF          <1> 	call	_set_cpos ; 17/01/2016
   413 00006E16 665A                <1>         pop	dx
   414                              <1> 	;movzx	ebx, dl
   415 00006E18 88D3                <1> 	mov	bl, dl
   416 00006E1A 2A1D[06430100]      <1> 	sub	bl, [CursorColumn] 
   417 00006E20 B020                <1> 	mov	al, 20h
   418 00006E22 8883[56430100]      <1> 	mov	[CommandBuffer+ebx], al
   419                              <1> 	;sub	bh, bh ; video page 0
   420                              <1> 	;mov	cx, 1
   421 00006E28 B307                <1> 	mov	bl, 7 ; color attribute
   422 00006E2A E80AAEFFFF          <1> 	call	_write_c_current ; 17/01/2016
   423                              <1> 	;mov	dx, [CURSOR_POSN]
   424 00006E2F EBC1                <1> 	jmp	short readnextchar
   425                              <1> loc_arrow:    
   426 00006E31 80FC4B              <1> 	cmp	ah, 4Bh
   427 00006E34 74CF                <1> 	je	short loc_back
   428 00006E36 80FC53              <1> 	cmp	ah, 53h
   429 00006E39 74CA                <1> 	je      short loc_back
   430 00006E3B 80FC4D              <1> 	cmp	ah, 4Dh
   431 00006E3E 75B2                <1> 	jne	short readnextchar
   432 00006E40 80FA4F              <1> 	cmp	dl, 79
   433 00006E43 73AD                <1> 	jnb	short readnextchar
   434 00006E45 FEC2                <1> 	inc	dl
   435 00006E47 EBC6                <1> 	jmp	short set_cursor_pos
   436                              <1> char_return:
   437 00006E49 0FB6DA              <1> 	movzx	ebx, dl
   438 00006E4C 2A1D[06430100]      <1> 	sub	bl, [CursorColumn] 
   439 00006E52 3C20                <1> 	cmp	al, 20h
   440 00006E54 7220                <1> 	jb	short loc_escape
   441 00006E56 8883[56430100]      <1> 	mov	[CommandBuffer+ebx], al
   442 00006E5C 80FA4F              <1> 	cmp	dl, 79
   443 00006E5F 7391                <1> 	jnb	short readnextchar
   444 00006E61 66BB0700            <1> 	mov	bx, 7 ; color attribute
   445 00006E65 E848AEFFFF          <1> 	call	_write_tty
   446 00006E6A 668B15[FE410100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   447 00006E71 E97CFFFFFF          <1>         jmp     readnextchar
   448                              <1> loc_escape:
   449 00006E76 3C1B                <1> 	cmp	al, 1Bh
   450 00006E78 7418                <1> 	je	short rw_char_retn
   451                              <1> 	;
   452 00006E7A 3C0D                <1> 	cmp	al, 0Dh ; CR
   453 00006E7C 0F8570FFFFFF        <1>         jne     readnextchar
   454                              <1> 	; 13/05/2016
   455 00006E82 66BB0700            <1> 	mov	bx, 7 ; attribute/color (bl)
   456                              <1> 		      ; video page 0 (bh=0)	
   457 00006E86 E827AEFFFF          <1> 	call	_write_tty
   458                              <1> 	;mov	bx, 7  ; attribute/color
   459                              <1> 		      ; video page 0 (bh=0)
   460 00006E8B B00A                <1> 	mov	al, 0Ah ; LF
   461 00006E8D E820AEFFFF          <1> 	call	_write_tty
   462                              <1> rw_char_retn:
   463 00006E92 C3                  <1> 	retn
   464                              <1> 
   465                              <1> show_date:
   466                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   467                              <1>         ; 2004-2005
   468                              <1> 
   469                              <1> 	;mov	ah, 04h
   470                              <1> 	;call	int1Ah
   471 00006E93 E820EBFFFF          <1> 	call	RTC_40	; GET RTC DATE
   472                              <1> 
   473 00006E98 88D0                <1> 	mov	al, dl
   474 00006E9A E86E9DFFFF          <1>   	call	bcd_to_ascii
   475 00006E9F 66A3[22000100]      <1> 	mov	[Day], ax
   476                              <1> 
   477 00006EA5 88F0                <1> 	mov	al, dh
   478 00006EA7 E8619DFFFF          <1>   	call	bcd_to_ascii
   479 00006EAC 66A3[25000100]      <1> 	mov	[Month], ax
   480                              <1> 
   481 00006EB2 88E8                <1> 	mov	al, ch
   482 00006EB4 E8549DFFFF          <1>   	call	bcd_to_ascii
   483 00006EB9 66A3[28000100]      <1> 	mov	[Century], ax
   484                              <1> 
   485 00006EBF 88C8                <1> 	mov	al, cl
   486 00006EC1 E8479DFFFF          <1>   	call	bcd_to_ascii
   487 00006EC6 66A3[2A000100]      <1> 	mov	word [Year], ax
   488                              <1> 
   489 00006ECC BE[12000100]        <1> 	mov	esi, Msg_Show_Date
   490 00006ED1 E8E7F3FFFF          <1> 	call	print_msg
   491                              <1> 
   492 00006ED6 C3                  <1> 	retn
   493                              <1> 
   494                              <1> set_date:
   495                              <1> 	; 13/05/2016
   496                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   497                              <1>         ; 2004-2005
   498                              <1> 
   499 00006ED7 BE[F6FF0000]        <1> 	mov	esi, Msg_Enter_Date
   500 00006EDC E8DCF3FFFF          <1> 	call	print_msg
   501                              <1> 
   502                              <1> loc_enter_day_1:
   503 00006EE1 30E4                <1> 	xor     ah, ah
   504 00006EE3 E82E9DFFFF          <1> 	call	int16h
   505                              <1> 	; AL = ASCII Code of the Character
   506 00006EE8 3C0D                <1> 	cmp	al, 13
   507 00006EEA 0F84B7010000        <1> 	je	loc_set_date_retn
   508 00006EF0 3C1B                <1> 	cmp	al, 27
   509 00006EF2 0F84AF010000        <1> 	je	loc_set_date_retn
   510 00006EF8 A2[22000100]        <1> 	mov	[Day], al
   511 00006EFD 3C30                <1> 	cmp	al, '0'
   512 00006EFF 0F82AD010000        <1> 	jb	loc_set_date_stc_0
   513 00006F05 3C33                <1> 	cmp	al, '3'
   514 00006F07 0F87A5010000        <1> 	ja	loc_set_date_stc_0
   515                              <1> 	; 13/05/2016
   516                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   517                              <1> 		      ; video page 0 (bh)	
   518 00006F0D B307                <1> 	mov	bl, 7
   519 00006F0F E89EADFFFF          <1> 	call	_write_tty
   520                              <1> loc_enter_day_2:
   521 00006F14 30E4                <1> 	xor     ah, ah
   522 00006F16 E8FB9CFFFF          <1> 	call	int16h
   523                              <1> 	; AL = ASCII Code of the Character
   524 00006F1B 3C1B                <1> 	cmp	al, 27
   525 00006F1D 0F8484010000        <1>         je      loc_set_date_retn
   526 00006F23 A2[23000100]        <1> 	mov	[Day+1], al
   527 00006F28 3C30                <1> 	cmp	al, '0'
   528 00006F2A 0F828C010000        <1>         jb      loc_set_date_stc_1
   529 00006F30 3C39                <1> 	cmp	al, '9'
   530 00006F32 0F8784010000        <1>         ja      loc_set_date_stc_1
   531 00006F38 803D[22000100]33    <1> 	cmp	byte [Day], '3'
   532 00006F3F 7208                <1> 	jb	short pass_set_day_31
   533 00006F41 3C31                <1> 	cmp	al, '1'
   534 00006F43 0F8773010000        <1>         ja      loc_set_date_stc_1
   535                              <1> pass_set_day_31:
   536                              <1> 	; 13/05/2016
   537                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   538                              <1> 		      ; video page 0 (bh)	
   539 00006F49 B307                <1> 	mov	bl, 7
   540 00006F4B E862ADFFFF          <1> 	call	_write_tty
   541                              <1> loc_enter_separator_1:
   542 00006F50 28E4                <1> 	sub     ah, ah ; 0
   543 00006F52 E8BF9CFFFF          <1> 	call	int16h
   544                              <1> 	; AL = ASCII Code of the Character
   545 00006F57 3C1B                <1> 	cmp	al, 27
   546 00006F59 0F8448010000        <1>         je      loc_set_date_retn
   547 00006F5F 3C2D                <1> 	cmp	al, '-'
   548 00006F61 7408                <1> 	je	short pass_set_date_separator_1
   549 00006F63 3C2F                <1> 	cmp	al, '/'
   550 00006F65 0F856C010000        <1>         jne     loc_set_date_stc_2
   551                              <1> pass_set_date_separator_1:
   552                              <1> 	; 13/05/2016
   553                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   554                              <1> 		      ; video page 0 (bh)
   555 00006F6B B307                <1> 	mov	bl, 7	
   556 00006F6D E840ADFFFF          <1> 	call	_write_tty
   557                              <1> loc_enter_month_1:
   558 00006F72 30E4                <1> 	xor     ah, ah ; 0
   559 00006F74 E89D9CFFFF          <1> 	call	int16h
   560                              <1> 	; AL = ASCII Code of the Character
   561 00006F79 3C1B                <1> 	cmp	al, 27
   562 00006F7B 0F8426010000        <1>         je      loc_set_date_retn
   563 00006F81 A2[25000100]        <1> 	mov	[Month], al
   564 00006F86 3C30                <1> 	cmp	al, '0'
   565 00006F88 0F8264010000        <1>         jb      loc_set_date_stc_3
   566 00006F8E 3C31                <1> 	cmp	al, '1'
   567 00006F90 0F875C010000        <1>         ja      loc_set_date_stc_3
   568                              <1> 	; 13/05/2016
   569                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   570                              <1> 		      ; video page 0 (bh)	
   571 00006F96 B307                <1> 	mov	bl, 7
   572 00006F98 E815ADFFFF          <1> 	call	_write_tty
   573                              <1> loc_enter_month_2:
   574 00006F9D 30E4                <1> 	xor     ah, ah
   575 00006F9F E8729CFFFF          <1> 	call	int16h
   576                              <1> 	; AL = ASCII Code of the Character
   577 00006FA4 3C1B                <1> 	cmp	al, 27
   578 00006FA6 0F84FB000000        <1>         je      loc_set_date_retn
   579 00006FAC A2[26000100]        <1> 	mov	[Month+1], al
   580 00006FB1 3C30                <1> 	cmp	al, '0'
   581 00006FB3 0F8254010000        <1>         jb      loc_set_date_stc_4
   582 00006FB9 3C39                <1> 	cmp	al, '9'
   583 00006FBB 0F874C010000        <1>         ja      loc_set_date_stc_4
   584 00006FC1 803D[25000100]31    <1> 	cmp	byte [Month], '1'
   585 00006FC8 7208                <1> 	jb	short pass_set_month_12
   586 00006FCA 3C32                <1> 	cmp	al, '2'
   587 00006FCC 0F873B010000        <1>         ja      loc_set_date_stc_4
   588                              <1> pass_set_month_12:
   589                              <1> 	; 13/05/2016
   590                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   591                              <1> 		      ; video page 0 (bh)
   592 00006FD2 B307                <1> 	mov	bl, 7	
   593 00006FD4 E8D9ACFFFF          <1> 	call	_write_tty
   594                              <1> loc_enter_separator_2:
   595 00006FD9 28E4                <1> 	sub     ah, ah
   596 00006FDB E8369CFFFF          <1> 	call	int16h
   597                              <1> 	; AL = ASCII Code of the Character
   598 00006FE0 3C1B                <1> 	cmp	al, 27
   599 00006FE2 0F84BF000000        <1>         je      loc_set_date_retn
   600 00006FE8 3C2D                <1> 	cmp	al, '-'
   601 00006FEA 7408                <1> 	je	short pass_set_date_separator_2
   602 00006FEC 3C2F                <1> 	cmp	al, '/'
   603 00006FEE 0F8534010000        <1>         jne     loc_set_date_stc_5
   604                              <1> pass_set_date_separator_2:
   605                              <1> 	; 13/05/2016
   606                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   607                              <1> 		      ; video page 0 (bh)	
   608 00006FF4 B307                <1> 	mov	bl, 7
   609 00006FF6 E8B7ACFFFF          <1> 	call	_write_tty
   610                              <1> loc_enter_year_1:
   611 00006FFB 30E4                <1> 	xor    ah, ah
   612 00006FFD E8149CFFFF          <1> 	call	int16h
   613                              <1> 	; AL = ASCII Code of the Character
   614 00007002 3C1B                <1> 	cmp	al, 27
   615 00007004 0F849D000000        <1>         je      loc_set_date_retn
   616 0000700A A2[2A000100]        <1> 	mov	[Year], al
   617 0000700F 3C30                <1> 	cmp	al, '0'
   618 00007011 0F822C010000        <1>         jb      loc_set_date_stc_6
   619 00007017 3C39                <1> 	cmp	al, '9'
   620 00007019 0F8724010000        <1>         ja      loc_set_date_stc_6
   621                              <1> 	; 13/05/2016
   622                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   623                              <1> 		      ; video page 0 (bh)
   624 0000701F B307                <1> 	mov	bl, 7	
   625 00007021 E88CACFFFF          <1> 	call	_write_tty
   626                              <1> loc_enter_year_2:
   627 00007026 30E4                <1> 	xor	ah, ah
   628 00007028 E8E99BFFFF          <1> 	call	int16h
   629                              <1> 	; AL = ASCII Code of the Character
   630 0000702D 3C1B                <1> 	cmp	al, 27
   631 0000702F 7476                <1> 	je	short loc_set_date_retn
   632 00007031 A2[2B000100]        <1> 	mov	byte [Year+1], al
   633 00007036 3C30                <1> 	cmp	al, '0'
   634 00007038 0F8220010000        <1>         jb      loc_set_date_stc_7
   635 0000703E 3C39                <1> 	cmp	al, '9'
   636 00007040 0F8718010000        <1>         ja      loc_set_date_stc_7
   637                              <1> 	; 13/05/2016
   638                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   639                              <1> 		      ; video page 0 (bh)
   640 00007046 B307                <1> 	mov	bl, 7	
   641 00007048 E865ACFFFF          <1> 	call	_write_tty
   642                              <1> loc_set_date_get_lchar_again:
   643 0000704D 28E4                <1> 	sub	ah, ah ; 0
   644 0000704F E8C29BFFFF          <1> 	call	int16h
   645                              <1> 	; AL = ASCII Code of the Character
   646 00007054 3C0D                <1> 	cmp	al, 13 ; ENTER key
   647 00007056 7412                <1> 	je	short loc_set_date_progress
   648 00007058 3C1B                <1> 	cmp	al, 27 ; ESC key
   649 0000705A 744B                <1> 	je	short loc_set_date_retn
   650                              <1> 	;
   651 0000705C E82A010000          <1> 	call	check_for_backspace
   652 00007061 75EA                <1> 	jne	short loc_set_date_get_lchar_again
   653                              <1> 
   654                              <1> loc_set_date_bs_8:
   655 00007063 E811010000          <1> 	call	write_backspace
   656 00007068 EBBC                <1> 	jmp	short loc_enter_year_2
   657                              <1> 
   658                              <1> loc_set_date_progress:
   659                              <1> 	; Get Current Date
   660                              <1> 	;mov	ah, 04h
   661                              <1> 	;call	int1Ah
   662 0000706A E849E9FFFF          <1> 	call	RTC_40	; GET RTC DATE
   663                              <1> 	; CH = century (in BCD)
   664                              <1> 
   665 0000706F 66A1[2A000100]      <1> 	mov	ax, [Year]
   666 00007075 662D3030            <1> 	sub	ax, '00'
   667 00007079 C0E004              <1> 	shl	al, 4 ; * 16
   668 0000707C 88C1                <1> 	mov	cl, al
   669 0000707E 00E1                <1> 	add	cl, ah
   670 00007080 66A1[25000100]      <1> 	mov	ax, [Month]
   671 00007086 662D3030            <1> 	sub	ax, '00'
   672 0000708A C0E004              <1> 	shl	al, 4 ; * 16
   673 0000708D 88C6                <1> 	mov	dh, al
   674 0000708F 00E6                <1> 	add	dh, ah
   675 00007091 66A1[22000100]      <1> 	mov	ax, [Day]
   676 00007097 662D3030            <1> 	sub	ax, '00'
   677 0000709B C0E004              <1> 	shl	al, 4 ; * 16
   678 0000709E 88C2                <1> 	mov	dl, al
   679 000070A0 00E2                <1> 	add	dl, ah
   680                              <1> 
   681                              <1> 	;mov	ah, 05h
   682                              <1> 	;call	int1Ah
   683 000070A2 E83EE9FFFF          <1> 	call	RTC_50	; SET RTC DATE
   684                              <1> 
   685                              <1> loc_set_date_retn:
   686 000070A7 BE[4F0B0100]        <1> 	mov	esi, nextline
   687 000070AC E80CF2FFFF          <1> 	call	print_msg
   688 000070B1 C3                  <1> 	retn
   689                              <1> 
   690                              <1> loc_set_date_stc_0:
   691                              <1> 	;xor	bh, bh ; video page 0
   692 000070B2 E8DBACFFFF          <1> 	call	beeper ; BEEP !
   693 000070B7 E925FEFFFF          <1>         jmp     loc_enter_day_1
   694                              <1> loc_set_date_stc_1:
   695 000070BC E8CA000000          <1> 	call	check_for_backspace
   696 000070C1 740A                <1> 	je	short loc_set_date_bs_1
   697                              <1> 	;xor	bh, bh ; video page 0
   698 000070C3 E8CAACFFFF          <1> 	call	beeper ; BEEP !
   699 000070C8 E947FEFFFF          <1>         jmp     loc_enter_day_2
   700                              <1> loc_set_date_bs_1:
   701 000070CD E8A7000000          <1> 	call	write_backspace
   702 000070D2 E90AFEFFFF          <1>         jmp     loc_enter_day_1
   703                              <1> loc_set_date_stc_2:
   704 000070D7 E8AF000000          <1> 	call	check_for_backspace
   705 000070DC 740A                <1> 	je	short loc_set_date_bs_2
   706                              <1> 	;xor	bh, bh ; video page 0
   707 000070DE E8AFACFFFF          <1> 	call	beeper ; BEEP !
   708 000070E3 E968FEFFFF          <1>         jmp     loc_enter_separator_1
   709                              <1> loc_set_date_bs_2:
   710 000070E8 E88C000000          <1> 	call	write_backspace
   711 000070ED E922FEFFFF          <1>         jmp     loc_enter_day_2
   712                              <1> loc_set_date_stc_3:
   713 000070F2 E894000000          <1> 	call	check_for_backspace	
   714 000070F7 740A                <1> 	je short loc_set_date_bs_3
   715                              <1> 	;xor	bh, bh ; video page 0
   716 000070F9 E894ACFFFF          <1> 	call	beeper ; BEEP !
   717 000070FE E96FFEFFFF          <1>         jmp     loc_enter_month_1
   718                              <1> loc_set_date_bs_3:
   719 00007103 E871000000          <1> 	call	write_backspace
   720 00007108 E943FEFFFF          <1>         jmp     loc_enter_separator_1
   721                              <1> loc_set_date_stc_4:
   722 0000710D E879000000          <1> 	call	check_for_backspace	
   723 00007112 740A                <1> 	je	short loc_set_date_bs_4
   724                              <1> 	;xor	bh, bh ; video page 0
   725 00007114 E879ACFFFF          <1> 	call	beeper ; BEEP !
   726 00007119 E97FFEFFFF          <1>         jmp     loc_enter_month_2
   727                              <1> loc_set_date_bs_4:
   728 0000711E E856000000          <1> 	call	write_backspace
   729 00007123 E94AFEFFFF          <1>         jmp     loc_enter_month_1
   730                              <1> loc_set_date_stc_5:
   731 00007128 E85E000000          <1> 	call	check_for_backspace
   732 0000712D 740A                <1> 	je	short loc_set_date_bs_5
   733                              <1> 	;xor	bh, bh ; video page 0
   734 0000712F E85EACFFFF          <1> 	call	beeper ; BEEP !
   735 00007134 E9A0FEFFFF          <1>         jmp     loc_enter_separator_2
   736                              <1> loc_set_date_bs_5:
   737 00007139 E83B000000          <1> 	call	write_backspace
   738 0000713E E95AFEFFFF          <1>         jmp     loc_enter_month_2
   739                              <1> loc_set_date_stc_6:
   740 00007143 E843000000          <1> 	call	check_for_backspace
   741 00007148 740A                <1>         je      short  loc_set_date_bs_6
   742                              <1> 	;xor	bh, bh ; video page 0
   743 0000714A E843ACFFFF          <1> 	call	beeper ; BEEP !
   744 0000714F E9A7FEFFFF          <1>         jmp     loc_enter_year_1
   745                              <1> loc_set_date_bs_6:
   746 00007154 E820000000          <1> 	call	write_backspace
   747 00007159 E97BFEFFFF          <1>         jmp     loc_enter_separator_2
   748                              <1> loc_set_date_stc_7:
   749 0000715E E828000000          <1> 	call	check_for_backspace
   750 00007163 740A                <1> 	je	short loc_set_date_bs_7
   751                              <1> 	;xor	bh, bh ; video page 0
   752 00007165 E828ACFFFF          <1> 	call	beeper ; BEEP !
   753 0000716A E9B7FEFFFF          <1>         jmp     loc_enter_year_2
   754                              <1> loc_set_date_bs_7:
   755 0000716F E805000000          <1> 	call	write_backspace
   756 00007174 E982FEFFFF          <1>         jmp     loc_enter_year_1
   757                              <1> 
   758                              <1> write_backspace:
   759                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   760 00007179 B008                <1> 	mov	al, 08h ; BACKSPACE
   761                              <1> 	; 13/05/2016
   762 0000717B 66BB0700            <1> 	mov	bx, 7 ; bl = attribute/color
   763                              <1> 		      ; bh = video page = 0	
   764 0000717F E82EABFFFF          <1> 	call	_write_tty
   765 00007184 B020                <1> 	mov	al, 20h ; BLANK/SPACE char 
   766                              <1> 	;mov	bx, 7 ; attribute/color
   767                              <1> 	;call	_write_c_current
   768                              <1> 	;retn
   769 00007186 E9AEAAFFFF          <1> 	jmp	_write_c_current
   770                              <1> 
   771                              <1> check_for_backspace:
   772                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   773 0000718B 663D080E            <1> 	cmp	ax, 0E08h
   774 0000718F 7410                <1> 	je	short cfbs_retn
   775 00007191 663DE04B            <1> 	cmp	ax, 4BE0h
   776 00007195 740A                <1> 	je	short cfbs_retn
   777 00007197 663D004B            <1> 	cmp	ax, 4B00h
   778 0000719B 7404                <1> 	je	short cfbs_retn
   779 0000719D 663DE053            <1> 	cmp	ax, 53E0h
   780                              <1> cfbs_retn:
   781 000071A1 C3                  <1> 	retn
   782                              <1> 
   783                              <1> show_time:
   784                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   785                              <1>         ; 2004-2005
   786                              <1> 
   787                              <1> 	;mov	ah, 02h
   788                              <1> 	;call	int1Ah
   789 000071A2 E8A0E7FFFF          <1> 	call	RTC_20	; GET RTC TIME
   790                              <1> 	
   791 000071A7 88E8                <1> 	mov	al, ch
   792 000071A9 E85F9AFFFF          <1> 	call	bcd_to_ascii
   793 000071AE 66A3[50000100]      <1> 	mov	[Hour], ax
   794                              <1> 
   795 000071B4 88C8                <1> 	mov	al, cl
   796 000071B6 E8529AFFFF          <1> 	call	bcd_to_ascii
   797 000071BB 66A3[53000100]      <1> 	mov	[Minute], ax
   798                              <1> 
   799 000071C1 88F0                <1> 	mov	al, dh
   800 000071C3 E8459AFFFF          <1> 	call	bcd_to_ascii
   801 000071C8 66A3[56000100]      <1> 	mov	[Second], ax
   802                              <1> 
   803 000071CE BE[40000100]        <1> 	mov	esi, Msg_Show_Time
   804 000071D3 E8E5F0FFFF          <1> 	call	print_msg
   805 000071D8 C3                  <1> 	retn
   806                              <1> 
   807                              <1> set_time:
   808                              <1> 	; 13/05/2016
   809                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   810                              <1>         ; 2004-2005
   811                              <1> 
   812 000071D9 BE[2F000100]        <1> 	mov 	esi, Msg_Enter_Time
   813 000071DE E8DAF0FFFF          <1> 	call	print_msg
   814                              <1> 
   815                              <1> loc_enter_hour_1:
   816 000071E3 30E4                <1> 	xor     ah, ah
   817 000071E5 E82C9AFFFF          <1> 	call	int16h
   818                              <1> 	; AL = ASCII Code of the Character
   819 000071EA 3C0D                <1> 	cmp	al, 13 ; ENTER key
   820 000071EC 0F84AE010000        <1>         je      loc_set_time_retn
   821 000071F2 3C1B                <1> 	cmp	al, 27 ; ESC key
   822 000071F4 0F84A6010000        <1>         je      loc_set_time_retn
   823 000071FA A2[50000100]        <1> 	mov	[Hour], al
   824 000071FF 3C30                <1> 	cmp	al, '0'
   825 00007201 0F82A4010000        <1>         jb      loc_set_time_stc_0
   826 00007207 3C32                <1> 	cmp	al, '2'
   827 00007209 0F879C010000        <1>         ja      loc_set_time_stc_0
   828                              <1> 	; 13/05/2016
   829                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   830                              <1> 		      ; video page 0 (bh)
   831 0000720F B307                <1> 	mov	bl, 7	
   832 00007211 E89CAAFFFF          <1> 	call	_write_tty
   833                              <1> loc_enter_hour_2:
   834 00007216 30E4                <1> 	xor     ah, ah
   835 00007218 E8F999FFFF          <1> 	call	int16h
   836                              <1> 	; AL = ASCII Code of the Character
   837 0000721D 3C1B                <1> 	cmp	al, 27
   838 0000721F 0F847B010000        <1>         je      loc_set_time_retn
   839 00007225 A2[51000100]        <1> 	mov	[Hour+1], al
   840 0000722A 3C30                <1> 	cmp	al, '0'
   841 0000722C 0F8283010000        <1>         jb      loc_set_time_stc_1
   842 00007232 3C39                <1> 	cmp	al, '9'
   843 00007234 0F877B010000        <1> 	ja	loc_set_time_stc_1
   844 0000723A 803D[50000100]32    <1>         cmp     byte [Hour], '2'
   845 00007241 7208                <1> 	jb	short pass_set_time_24
   846 00007243 3C34                <1> 	cmp	al, '4'
   847 00007245 0F876A010000        <1>         ja      loc_set_time_stc_1
   848                              <1> pass_set_time_24:
   849                              <1> 	; 13/05/2016
   850                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   851                              <1> 		      ; video page 0 (bh)
   852 0000724B B307                <1> 	mov	bl, 7	
   853 0000724D E860AAFFFF          <1> 	call	_write_tty
   854                              <1> loc_enter_time_separator_1:
   855 00007252 28E4                <1> 	sub    ah, ah ; 0
   856 00007254 E8BD99FFFF          <1> 	call	int16h
   857                              <1> 	; AL = ASCII Code of the Character
   858 00007259 3C1B                <1> 	cmp	al, 27
   859 0000725B 0F843F010000        <1>         je      loc_set_time_retn
   860 00007261 3C3A                <1> 	cmp	al, ':'
   861 00007263 0F8567010000        <1>         jne     loc_set_time_stc_2
   862                              <1> 	; 13/05/2016
   863                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   864                              <1> 		      ; video page 0 (bh)
   865 00007269 B307                <1> 	mov	bl, 7	
   866 0000726B E842AAFFFF          <1> 	call	_write_tty
   867                              <1> loc_enter_minute_1:
   868 00007270 30E4                <1> 	xor     ah, ah
   869 00007272 E89F99FFFF          <1> 	call	int16h
   870                              <1> 	; AL = ASCII Code of the Character
   871 00007277 3C1B                <1> 	cmp	al, 27
   872 00007279 0F8421010000        <1>         je      loc_set_time_retn
   873 0000727F A2[53000100]        <1> 	mov	[Minute], al
   874 00007284 3C30                <1> 	cmp	al, '0'
   875 00007286 0F825F010000        <1>         jb      loc_set_time_stc_3
   876 0000728C 3C35                <1> 	cmp	al, '5'
   877 0000728E 0F8757010000        <1>         ja      loc_set_time_stc_3
   878                              <1> 	; 13/05/2016
   879                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   880                              <1> 		      ; video page 0 (bh)
   881 00007294 B307                <1> 	mov	bl, 7	
   882 00007296 E817AAFFFF          <1> 	call	_write_tty
   883                              <1> loc_enter_minute_2:
   884 0000729B 30E4                <1> 	xor     ah, ah
   885 0000729D E87499FFFF          <1> 	call	int16h
   886                              <1> 	; AL = ASCII Code of the Character
   887 000072A2 3C1B                <1> 	cmp	al, 27
   888 000072A4 0F84F6000000        <1>         je      loc_set_time_retn
   889 000072AA A2[54000100]        <1> 	mov	[Minute+1], al
   890 000072AF 3C30                <1> 	cmp	al, '0'
   891 000072B1 0F824F010000        <1>         jb      loc_set_time_stc_4
   892 000072B7 3C39                <1> 	cmp	al, '9'
   893 000072B9 0F8747010000        <1>         ja      loc_set_time_stc_4
   894                              <1> 	; 13/05/2016
   895                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   896                              <1> 		      ; video page 0 (bh)
   897 000072BF B307                <1> 	mov	bl, 7	
   898 000072C1 E8ECA9FFFF          <1> 	call	_write_tty
   899                              <1> loc_enter_time_separator_2:
   900 000072C6 66C705[56000100]30- <1> 	mov	word [Second], 3030h
   900 000072CE 30                  <1>
   901 000072CF 28E4                <1> 	sub     ah, ah
   902 000072D1 E84099FFFF          <1> 	call	int16h
   903                              <1> 	; AL = ASCII Code of the Character
   904 000072D6 3C0D                <1> 	cmp	al, 13
   905 000072D8 0F8485000000        <1>         je      loc_set_time_progress
   906 000072DE 3C1B                <1> 	cmp	al, 27
   907 000072E0 0F84BA000000        <1>         je      loc_set_time_retn
   908 000072E6 3C3A                <1> 	cmp	al, ':'
   909 000072E8 0F8533010000        <1>         jne     loc_set_time_stc_5
   910                              <1> 	; 13/05/2016
   911                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   912                              <1> 		      ; video page 0 (bh)
   913 000072EE B307                <1> 	mov	bl, 7	
   914 000072F0 E8BDA9FFFF          <1> 	call	_write_tty
   915                              <1> loc_enter_second_1:
   916 000072F5 30E4                <1> 	xor     ah, ah
   917 000072F7 E81A99FFFF          <1> 	call	int16h
   918                              <1> 	; AL = ASCII Code of the Character
   919 000072FC 3C0D                <1> 	cmp	al, 13
   920 000072FE 7463                <1> 	je	short loc_set_time_progress
   921 00007300 3C1B                <1> 	cmp	al, 27
   922 00007302 0F8498000000        <1>         je      loc_set_time_retn
   923 00007308 A2[56000100]        <1> 	mov	[Second], al
   924 0000730D 3C30                <1> 	cmp	al, '0'
   925 0000730F 0F8227010000        <1>         jb      loc_set_time_stc_6
   926 00007315 3C35                <1> 	cmp	al, '5'
   927 00007317 0F871F010000        <1>         ja      loc_set_time_stc_6
   928                              <1> 	; 13/05/2016
   929                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   930                              <1> 		      ; video page 0 (bh)
   931 0000731D B307                <1> 	mov	bl, 7	
   932 0000731F E88EA9FFFF          <1> 	call	_write_tty
   933                              <1> loc_enter_second_2:
   934 00007324 30E4                <1> 	xor     ah, ah
   935 00007326 E8EB98FFFF          <1> 	call	int16h
   936                              <1> 	; AL = ASCII Code of the Character
   937 0000732B 3C1B                <1> 	cmp	al, 27
   938 0000732D 7471                <1> 	je	short loc_set_time_retn
   939 0000732F 3C30                <1> 	cmp	al, '0'
   940 00007331 0F8229010000        <1>         jb      loc_set_time_stc_7
   941 00007337 3C39                <1> 	cmp	al, '9'
   942 00007339 0F8721010000        <1>         ja      loc_set_time_stc_7
   943                              <1> 	; 13/05/2016
   944                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   945                              <1> 		      ; video page 0 (bh)
   946 0000733F B307                <1> 	mov	bl, 7	
   947 00007341 E86CA9FFFF          <1> 	call	_write_tty
   948                              <1> loc_set_time_get_lchar_again:
   949 00007346 28E4                <1> 	sub	ah, ah ; 0
   950 00007348 E8C998FFFF          <1> 	call	int16h
   951                              <1> 	; AL = ASCII Code of the Character
   952 0000734D 3C0D                <1> 	cmp	al, 13
   953 0000734F 7412                <1> 	je	short loc_set_time_progress
   954 00007351 3C1B                <1> 	cmp	al, 27
   955 00007353 744B                <1> 	je	short loc_set_time_retn
   956                              <1> 	;
   957 00007355 E831FEFFFF          <1> 	call	check_for_backspace
   958 0000735A 75EA                <1> 	jne	short loc_set_time_get_lchar_again
   959                              <1> 
   960                              <1> loc_set_time_bs_8:
   961 0000735C E818FEFFFF          <1> 	call	write_backspace
   962 00007361 EBC1                <1> 	jmp	short loc_enter_second_2
   963                              <1> 
   964                              <1> loc_set_time_progress:
   965                              <1> 	; Get Current Time
   966                              <1> 	;mov 	ah, 02h
   967                              <1> 	;call	int1Ah
   968 00007363 E8DFE5FFFF          <1> 	call	RTC_20	; GET RTC TIME
   969                              <1> 	;DL = Daylight Savings Enable option (0-1)	
   970                              <1> 
   971 00007368 66A1[50000100]      <1> 	mov	ax, [Hour]
   972 0000736E 662D3030            <1> 	sub	ax, '00'
   973 00007372 C0E004              <1> 	shl	al, 4 ; * 16
   974 00007375 88C5                <1> 	mov	ch, al
   975 00007377 00E5                <1> 	add	ch, ah
   976 00007379 66A1[53000100]      <1> 	mov	ax, [Minute]
   977 0000737F 662D3030            <1> 	sub	ax, '00'
   978 00007383 C0E004              <1> 	shl	al, 4 ; * 16
   979 00007386 88C1                <1> 	mov	cl, al
   980 00007388 00E1                <1> 	add	cl, ah
   981 0000738A 66A1[56000100]      <1> 	mov	ax, [Second]
   982 00007390 662D3030            <1> 	sub	ax, '00'
   983 00007394 C0E004              <1> 	shl	al, 4 ; * 16
   984 00007397 88C6                <1> 	mov	dh, al
   985 00007399 00E6                <1> 	add	dh, ah
   986                              <1> 	
   987                              <1> 	;mov	ah, 03h
   988                              <1> 	;call	int1Ah
   989 0000739B E8D6E5FFFF          <1> 	call	RTC_30	; SET RTC TIME
   990                              <1> 
   991                              <1> loc_set_time_retn:
   992 000073A0 BE[4F0B0100]        <1> 	mov 	esi, nextline
   993 000073A5 E813EFFFFF          <1> 	call	print_msg
   994 000073AA C3                  <1> 	retn
   995                              <1> 
   996                              <1> loc_set_time_stc_0:
   997                              <1> 	;xor	bh, bh ; video page 0
   998 000073AB E8E2A9FFFF          <1> 	call	beeper ; BEEP !
   999 000073B0 E92EFEFFFF          <1>         jmp     loc_enter_hour_1
  1000                              <1> loc_set_time_stc_1:
  1001 000073B5 E8D1FDFFFF          <1> 	call	check_for_backspace
  1002 000073BA 740A                <1> 	je	short loc_set_time_bs_1
  1003                              <1> 	;xor	bh, bh ; video page 0
  1004 000073BC E8D1A9FFFF          <1> 	call	beeper ; BEEP !
  1005 000073C1 E950FEFFFF          <1>         jmp     loc_enter_hour_2
  1006                              <1> loc_set_time_bs_1:
  1007 000073C6 E8AEFDFFFF          <1> 	call	write_backspace
  1008 000073CB E913FEFFFF          <1>         jmp     loc_enter_hour_1
  1009                              <1> loc_set_time_stc_2:
  1010 000073D0 E8B6FDFFFF          <1> 	call	check_for_backspace
  1011 000073D5 740A                <1> 	je	short loc_set_time_bs_2
  1012                              <1> 	;xor	bh, bh ; video page 0
  1013 000073D7 E8B6A9FFFF          <1> 	call	beeper ; BEEP !
  1014 000073DC E971FEFFFF          <1>         jmp     loc_enter_time_separator_1
  1015                              <1> loc_set_time_bs_2:
  1016 000073E1 E893FDFFFF          <1> 	call	write_backspace
  1017 000073E6 E92BFEFFFF          <1>         jmp     loc_enter_hour_2
  1018                              <1> loc_set_time_stc_3:
  1019 000073EB E89BFDFFFF          <1> 	call	check_for_backspace
  1020 000073F0 740A                <1> 	je	short loc_set_time_bs_3
  1021                              <1> 	;xor	bh, bh ; video page 0
  1022 000073F2 E89BA9FFFF          <1> 	call	beeper ; BEEP !6
  1023 000073F7 E974FEFFFF          <1>         jmp     loc_enter_minute_1
  1024                              <1> loc_set_time_bs_3:
  1025 000073FC E878FDFFFF          <1> 	call	write_backspace
  1026 00007401 E94CFEFFFF          <1>         jmp     loc_enter_time_separator_1
  1027                              <1> loc_set_time_stc_4:
  1028 00007406 E880FDFFFF          <1> 	call	check_for_backspace
  1029 0000740B 740A                <1> 	je	short loc_set_time_bs_4
  1030                              <1> 	;xor	bh, bh ; video page 0
  1031 0000740D E880A9FFFF          <1> 	call	beeper ; BEEP !
  1032 00007412 E984FEFFFF          <1>         jmp     loc_enter_minute_2
  1033                              <1> loc_set_time_bs_4:
  1034 00007417 E85DFDFFFF          <1> 	call	write_backspace
  1035 0000741C E94FFEFFFF          <1>         jmp     loc_enter_minute_1
  1036                              <1> loc_set_time_stc_5:
  1037 00007421 E865FDFFFF          <1> 	call	check_for_backspace
  1038 00007426 740A                <1> 	je	short loc_set_time_bs_5
  1039                              <1> 	;xor	bh, bh ; video page 0
  1040 00007428 E865A9FFFF          <1> 	call	beeper ; BEEP !
  1041 0000742D E994FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1042                              <1> loc_set_time_bs_5:
  1043 00007432 E842FDFFFF          <1> 	call	write_backspace
  1044 00007437 E95FFEFFFF          <1>         jmp     loc_enter_minute_2
  1045                              <1> loc_set_time_stc_6:
  1046 0000743C E84AFDFFFF          <1> 	call	check_for_backspace
  1047 00007441 7413                <1> 	je	short loc_set_time_bs_6
  1048                              <1> 	;xor	bh, bh ; video page 0
  1049 00007443 E84AA9FFFF          <1> 	call	beeper ; BEEP !
  1050 00007448 66C705[56000100]30- <1> 	mov	word [Second], 3030h
  1050 00007450 30                  <1>
  1051 00007451 E99FFEFFFF          <1>         jmp     loc_enter_second_1
  1052                              <1> loc_set_time_bs_6:
  1053 00007456 E81EFDFFFF          <1> 	call	write_backspace
  1054 0000745B E966FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1055                              <1> loc_set_time_stc_7:
  1056 00007460 E826FDFFFF          <1> 	call	check_for_backspace
  1057 00007465 740A                <1> 	je	short loc_set_time_bs_7
  1058                              <1> 	;xor	bh, bh ; video page 0
  1059 00007467 E826A9FFFF          <1> 	call	beeper ; BEEP !
  1060 0000746C E9B3FEFFFF          <1>         jmp     loc_enter_second_2
  1061                              <1> loc_set_time_bs_7:
  1062 00007471 E803FDFFFF          <1> 	call	write_backspace
  1063 00007476 E97AFEFFFF          <1>         jmp     loc_enter_second_1
  1064                              <1> 
  1065                              <1> print_volume_info:
  1066                              <1> 	; 01/03/2016
  1067                              <1> 	; 08/02/2016
  1068                              <1> 	; 06/02/2016
  1069                              <1> 	; 04/02/2016
  1070                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
  1071                              <1> 	; 25/10/2009
  1072                              <1> 	;
  1073                              <1> 	; "Volume Serial No: "
  1074                              <1>  	;
  1075                              <1> 	; INPUT  : AL = DOS Drive Number
  1076                              <1> 	; OUTPUT : AH = FS Type
  1077                              <1> 	;          AL = DOS Drive Name
  1078                              <1> 	; CF = 0 -> OK
  1079                              <1> 	; CF = 1 -> Drive not ready 
  1080                              <1> 
  1081 0000747B 88C4                <1> 	mov	ah, al
  1082 0000747D 28C0                <1> 	sub	al, al
  1083 0000747F 0FB7F0              <1> 	movzx	esi, ax	
  1084 00007482 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1085 00007488 8A06                <1> 	mov	al, [esi]
  1086 0000748A 3C41                <1> 	cmp	al, 'A'  
  1087 0000748C 7304                <1> 	jnb	short loc_pvi_set_vol_name
  1088 0000748E 8A6604              <1> 	mov	ah, [esi+LD_FSType]
  1089 00007491 C3                  <1> 	retn
  1090                              <1> 
  1091                              <1> loc_pvi_set_vol_name:
  1092 00007492 A2[8A000100]        <1> 	mov	[Vol_Drv_Name], al
  1093 00007497 56                  <1> 	push	esi
  1094 00007498 E858010000          <1> 	call	move_volume_name_and_serial_no ;;;
  1095 0000749D 7302                <1> 	jnc	short loc_pvi_mvn_ok
  1096 0000749F 5E                  <1> 	pop	esi
  1097 000074A0 C3                  <1> 	retn
  1098                              <1> 
  1099                              <1> loc_pvi_mvn_ok:
  1100 000074A1 8B3424              <1> 	mov	esi, [esp]
  1101 000074A4 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1102 000074A8 7509                <1> 	jne	short loc_pvi_fat_vol_size
  1103 000074AA 8B4670              <1> 	mov	eax, [esi+LD_FS_VolumeSize]
  1104 000074AD 0FB75E11            <1> 	movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1105 000074B1 EB07                <1> 	jmp	short loc_vol_size_mul32
  1106                              <1> loc_pvi_fat_vol_size:
  1107 000074B3 8B4670              <1> 	mov	eax, [esi+LD_TotalSectors]
  1108 000074B6 0FB75E11            <1> 	movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1109                              <1> loc_vol_size_mul32:
  1110 000074BA F7E3                <1> 	mul	ebx
  1111 000074BC 09D2                <1> 	or	edx, edx
  1112 000074BE 7507                <1> 	jnz	short loc_vol_size_in_kbytes
  1113                              <1> loc_vol_size_in_bytes:
  1114 000074C0 B9[68000100]        <1> 	mov	ecx, VolSize_Bytes
  1115 000074C5 EB0D                <1> 	jmp	short loc_write_vol_size_str
  1116                              <1> loc_vol_size_in_kbytes:
  1117 000074C7 66BB0004            <1> 	mov	bx, 1024
  1118 000074CB F7F3                <1> 	div	ebx
  1119 000074CD B9[5B000100]        <1> 	mov 	ecx, VolSize_KiloBytes
  1120 000074D2 31D2                <1> 	xor	edx, edx ; 0
  1121                              <1> loc_write_vol_size_str:
  1122 000074D4 890D[DF4A0100]      <1> 	mov	[VolSize_Unit1], ecx
  1123                              <1> 	; 
  1124 000074DA BF[F54A0100]        <1> 	mov	edi, Vol_Tot_Sec_Str_End
  1125                              <1>         ;mov	byte [edi], 0
  1126 000074DF B90A000000          <1> 	mov	ecx, 10
  1127                              <1> loc_write_vol_size_chr:
  1128 000074E4 F7F1                <1> 	div	ecx
  1129 000074E6 80C230              <1> 	add	dl, '0'
  1130 000074E9 4F                  <1> 	dec	edi	
  1131 000074EA 8817                <1> 	mov	[edi], dl
  1132 000074EC 85C0                <1> 	test	eax, eax
  1133 000074EE 7404                <1> 	jz	short loc_write_vol_size_str_ok
  1134 000074F0 28D2                <1> 	sub	dl, dl ; 0
  1135 000074F2 EBF0                <1> 	jmp	short loc_write_vol_size_chr
  1136                              <1> 
  1137                              <1> loc_write_vol_size_str_ok:
  1138 000074F4 893D[E74A0100]      <1> 	mov	[Vol_Tot_Sec_Str_Start], edi
  1139                              <1> 	;
  1140 000074FA BF[73000100]        <1> 	mov	edi, Vol_FS_Name
  1141 000074FF 8A4E03              <1> 	mov	cl, [esi+LD_FATType]
  1142 00007502 20C9                <1> 	and	cl, cl ; 0 ?
  1143 00007504 7515                <1> 	jnz	short loc_write_vol_FAT_str_1
  1144 00007506 66C7075452          <1> 	mov	word [edi], 'TR'
  1145 0000750B C7470420465331      <1> 	mov	dword [edi+4], ' FS1'
  1146                              <1> 	;movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1147 00007512 668B5E11            <1> 	mov	bx, [esi+LD_FS_BytesPerSec]
  1148 00007516 8B4674              <1> 	mov	eax, [esi+LD_FS_FreeSectors]
  1149 00007519 EB36                <1> 	jmp	short loc_vol_freespace_mul32
  1150                              <1> 
  1151                              <1> loc_write_vol_FAT_str_1:
  1152 0000751B 66B83332            <1> 	mov	ax, '32' ; FAT32
  1153 0000751F 80F902              <1> 	cmp	cl, 2 ; [esi+LD_FATType]
  1154 00007522 7708                <1> 	ja	short loc_write_vol_FAT_str_2
  1155 00007524 66B83132            <1> 	mov	ax, '12' ; FAT12
  1156 00007528 7202                <1> 	jb	short loc_write_vol_FAT_str_2
  1157 0000752A B436                <1> 	mov	ah, '6'  ; FAT16
  1158                              <1> loc_write_vol_FAT_str_2:
  1159 0000752C C70746415420        <1> 	mov	dword [edi], 'FAT '
  1160 00007532 66894704            <1> 	mov	word [edi+4], ax
  1161                              <1> 	;
  1162                              <1> 	;movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1163 00007536 668B5E11            <1> 	mov	bx, [esi+LD_BPB+BPB_BytsPerSec]
  1164 0000753A 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors]
  1165                              <1> 
  1166                              <1> loc_vol_freespace_recalc0:
  1167                              <1> 	; 01/03/2016
  1168 0000753D 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  1169 00007540 720F                <1> 	jb	short loc_vol_freespace_mul32
  1170                              <1> 	;inc	eax ; 0
  1171 00007542 20C9                <1> 	and	cl, cl ; byte [esi+LD_FATType]
  1172 00007544 740B                <1> 	jz	short loc_vol_freespace_mul32 	
  1173 00007546 53                  <1> 	push	ebx
  1174 00007547 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free sectors
  1175 0000754B E8A9490000          <1> 	call	calculate_fat_freespace
  1176 00007550 5B                  <1> 	pop	ebx
  1177                              <1> 
  1178                              <1> loc_vol_freespace_mul32:
  1179 00007551 F7E3                <1> 	mul	ebx
  1180 00007553 09D2                <1> 	or	edx, edx
  1181 00007555 7507                <1> 	jnz	short loc_vol_fspace_in_kbytes
  1182                              <1> loc_vol_fspace_in_bytes:
  1183 00007557 B9[68000100]        <1> 	mov	ecx, VolSize_Bytes
  1184 0000755C EB0D                <1> 	jmp	short loc_write_vol_fspace_str
  1185                              <1> loc_vol_fspace_in_kbytes:
  1186 0000755E 66BB0004            <1> 	mov	bx, 1024
  1187 00007562 F7F3                <1> 	div	ebx
  1188 00007564 B9[5B000100]        <1> 	mov 	ecx, VolSize_KiloBytes
  1189 00007569 31D2                <1> 	xor	edx, edx ; 0
  1190                              <1> loc_write_vol_fspace_str:
  1191 0000756B 890D[E34A0100]      <1> 	mov	[VolSize_Unit2], ecx
  1192                              <1> 	;	
  1193 00007571 BF[054B0100]        <1> 	mov	edi, Vol_Free_Sectors_Str_End
  1194                              <1>         ;mov	byte [edi], 0
  1195 00007576 B90A000000          <1> 	mov	ecx, 10
  1196                              <1> loc_write_vol_fspace_chr:
  1197 0000757B F7F1                <1> 	div	ecx
  1198 0000757D 80C230              <1> 	add	dl, '0'
  1199 00007580 4F                  <1> 	dec	edi	
  1200 00007581 8817                <1> 	mov	[edi], dl
  1201 00007583 85C0                <1> 	test	eax, eax
  1202 00007585 7404                <1> 	jz	short loc_write_vol_fspace_str_ok
  1203 00007587 28D2                <1> 	sub	dl, dl ; 0
  1204 00007589 EBF0                <1> 	jmp	short loc_write_vol_fspace_chr
  1205                              <1> 
  1206                              <1> loc_write_vol_fspace_str_ok:
  1207 0000758B 893D[F74A0100]      <1> 	mov	[Vol_Free_Sectors_Str_Start], edi
  1208                              <1> 	;
  1209 00007591 BE[71000100]        <1> 	mov	esi, Volume_in_drive
  1210 00007596 E822EDFFFF          <1> 	call	print_msg
  1211 0000759B BE[B1000100]        <1> 	mov	esi, Vol_Name
  1212 000075A0 E818EDFFFF          <1> 	call	print_msg
  1213 000075A5 BE[4F0B0100]        <1> 	mov	esi, nextline
  1214 000075AA E80EEDFFFF          <1> 	call	print_msg
  1215                              <1> 	;
  1216 000075AF BE[12010100]        <1> 	mov	esi, Vol_Total_Sector_Header
  1217 000075B4 E804EDFFFF          <1> 	call	print_msg
  1218 000075B9 8B35[E74A0100]      <1> 	mov	esi, [Vol_Tot_Sec_Str_Start]
  1219 000075BF E8F9ECFFFF          <1> 	call	print_msg
  1220 000075C4 8B35[DF4A0100]      <1> 	mov	esi, [VolSize_Unit1]
  1221 000075CA E8EEECFFFF          <1> 	call	print_msg
  1222                              <1> 	;
  1223 000075CF BE[23010100]        <1> 	mov	esi, Vol_Free_Sectors_Header
  1224 000075D4 E8E4ECFFFF          <1> 	call	print_msg
  1225 000075D9 8B35[F74A0100]      <1> 	mov	esi, [Vol_Free_Sectors_Str_Start]
  1226 000075DF E8D9ECFFFF          <1> 	call	print_msg
  1227 000075E4 8B35[E34A0100]      <1> 	mov	esi, [VolSize_Unit2]
  1228 000075EA E8CEECFFFF          <1> 	call	print_msg
  1229                              <1> 	;
  1230 000075EF 5E                  <1> 	pop	esi
  1231                              <1> 	
  1232                              <1> 	;mov	ah, [esi+LD_FSType]
  1233                              <1> 	;mov	al, [esi+LD_FATType]
  1234 000075F0 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1235                              <1> 
  1236 000075F4 C3                  <1> 	retn
  1237                              <1> 
  1238                              <1> move_volume_name_and_serial_no:
  1239                              <1> 	; 08/02/2016  (TRDOS 386 = TRDOS v2.0)
  1240                              <1> 	; this routine will be called by
  1241                              <1> 	; "print_volume_info" and "print_directory"
  1242                              <1> 	; INPUT ->
  1243                              <1> 	;	ESI = Logical DOS drv descripton table address
  1244                              <1> 	; OUTPUT ->
  1245                              <1> 	;	*Volume name will be moved to text area
  1246                              <1> 	;	*Volume serial number will be converted to
  1247                              <1> 	;	 text and will be moved to text area
  1248                              <1> 	;   cf = 1 -> invalid/unknown dos drive
  1249                              <1> 	;   cf = 0 -> ecx = 0
  1250                              <1> 	;
  1251                              <1> 	; (eax, edx, ecx, esi, edi will be changed)
  1252                              <1> 
  1253 000075F5 BF[B1000100]        <1> 	mov 	edi, Vol_Name
  1254                              <1> 
  1255                              <1> 	;mov	ah, [esi+LD_FSType]
  1256                              <1> 	;mov	al, [esi+LD_FATType]
  1257 000075FA 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1258 000075FE 80FCA1              <1> 	cmp	ah, 0A1h
  1259 00007601 7418                <1> 	je	short mvn_2
  1260 00007603 08E4                <1> 	or	ah, ah
  1261 00007605 7404                <1> 	jz	short mvn_0
  1262 00007607 08C0                <1> 	or	al, al
  1263 00007609 7504                <1> 	jnz	short mvn_1
  1264                              <1> mvn_0:
  1265 0000760B 8A06                <1> 	mov	al, [esi]
  1266 0000760D F9                  <1> 	stc
  1267 0000760E C3                  <1> 	retn
  1268                              <1> mvn_1:
  1269 0000760F 3C02                <1> 	cmp	al, 2
  1270 00007611 7717                <1> 	ja	short mvn_3 
  1271                              <1> 	;or	al, al
  1272                              <1> 	;jz	short mvn_2
  1273 00007613 8B462D              <1> 	mov	eax, [esi+LD_BPB+VolumeID]
  1274 00007616 83C631              <1> 	add	esi, LD_BPB+VolumeLabel
  1275 00007619 EB15                <1> 	jmp	short mvn_4
  1276                              <1> mvn_2:
  1277 0000761B 8B4628              <1> 	mov	eax, [esi+LD_FS_VolumeSerial]
  1278 0000761E 83C62C              <1> 	add	esi, LD_FS_VolumeName
  1279 00007621 B910000000          <1> 	mov	ecx, 16
  1280 00007626 F3A5                <1> 	rep	movsd
  1281 00007628 EB10                <1> 	jmp	short mvn_5
  1282                              <1> mvn_3:
  1283 0000762A 8B4649              <1> 	mov	eax, [esi+LD_BPB+FAT32_VolID]
  1284 0000762D 83C64D              <1> 	add	esi, LD_BPB+FAT32_VolLab
  1285                              <1> mvn_4:
  1286 00007630 B90B000000          <1> 	mov	ecx, 11
  1287 00007635 F3A4                <1> 	rep	movsb
  1288 00007637 C60700              <1> 	mov	byte [edi], 0
  1289                              <1> mvn_5:
  1290                              <1> 	;mov	[Current_VolSerial], eax  
  1291 0000763A E8CABCFFFF          <1> 	call	dwordtohex
  1292 0000763F 8915[06010100]      <1> 	mov	[Vol_Serial1], edx
  1293 00007645 A3[0B010100]        <1> 	mov	[Vol_Serial2], eax
  1294                              <1> 	; ecx = 0
  1295 0000764A C3                  <1> 	retn
  1296                              <1> 
  1297                              <1> get_volume_serial_number:
  1298                              <1> 	; 19/01/2016 (TRDOS 386 = TRDOS v2.0)
  1299                              <1> 	; 08/08/2010
  1300                              <1> 	;
  1301                              <1> 	; INPUT -> DL = Logical DOS Drive number
  1302                              <1> 	; OUTPUT -> EAX = Volume serial number
  1303                              <1> 	;          BL= FAT Type	    
  1304                              <1> 	;          BH = Logical DOS drv Number (DL input)
  1305                              <1> 	; cf = 1 -> Drive not ready
  1306                              <1> 
  1307 0000764B 31DB                <1> 	xor	ebx, ebx
  1308 0000764D 88D7                <1> 	mov	bh, dl
  1309 0000764F 3815[E2FE0000]      <1> 	cmp	[Last_DOS_DiskNo], dl
  1310 00007655 7304                <1> 	jnb	short loc_gvsn_start
  1311                              <1> loc_gvsn_stc_retn:
  1312 00007657 31C0                <1> 	xor	eax, eax
  1313 00007659 F9                  <1> 	stc 
  1314 0000765A C3                  <1>         retn 
  1315                              <1> loc_gvsn_start:
  1316 0000765B 56                  <1> 	push	esi
  1317 0000765C BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1318 00007661 01DE                <1> 	add	esi, ebx
  1319 00007663 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
  1320 00007666 20DB                <1> 	and	bl, bl
  1321 00007668 740F                <1> 	jz	short loc_gvsn_fs
  1322 0000766A 80FB02              <1> 	cmp	bl, 2
  1323 0000766D 7705                <1> 	ja	short loc_gvsn_fat32
  1324                              <1> loc_gvsn_fat:
  1325 0000766F 83C62D              <1> 	add	esi, LD_BPB + VolumeID
  1326 00007672 EB0E                <1> 	jmp	short loc_gvsn_return
  1327                              <1> loc_gvsn_fat32: 
  1328 00007674 83C649              <1> 	add	esi, LD_BPB + FAT32_VolID
  1329 00007677 EB09                <1> 	jmp	short loc_gvsn_return 
  1330                              <1> loc_gvsn_fs:
  1331 00007679 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1332 0000767D 75D8                <1> 	jne	short loc_gvsn_stc_retn 
  1333 0000767F 83C628              <1> 	add	esi, LD_FS_VolumeSerial
  1334                              <1> loc_gvsn_return:
  1335 00007682 8B06                <1> 	mov	eax, [esi]
  1336 00007684 5E                  <1> 	pop	esi
  1337 00007685 C3                  <1> 	retn
  1338                              <1> 
  1339                              <1> ; CMD_INTR.ASM [ TRDOS Command Interpreter Procedure ]
  1340                              <1> ; 09/11/2011
  1341                              <1> ; 29/01/2005
  1342                              <1> 
  1343                              <1> command_interpreter:
  1344                              <1> 	; 16/10/2016
  1345                              <1> 	; 12/10/2016
  1346                              <1> 	; 13/05/2016
  1347                              <1> 	; 07/05/2016
  1348                              <1> 	; 04/03/2016
  1349                              <1> 	; 04/02/2016
  1350                              <1> 	; 03/02/2016
  1351                              <1> 	; 30/01/2016
  1352                              <1> 	; 29/01/2016 (TRDOS 386 = TRDOS 2.0)
  1353                              <1> 	; 15/09/2011         
  1354                              <1> 	; 29/01/2005
  1355                              <1>         
  1356                              <1> 	; Input: ecx = command word length (CL)
  1357                              <1> 	;	 CommandBuffer = Command string offset
  1358                              <1>  
  1359 00007686 C605[984B0100]00    <1> 	mov	byte [Program_Exit],0
  1360 0000768D 80F904              <1> 	cmp	cl, 4
  1361 00007690 0F87AE020000        <1>         ja      c_6
  1362 00007696 0F822E010000        <1>         jb      c_2
  1363                              <1> c_4:
  1364                              <1> 
  1365                              <1> cmp_cmd_exit:
  1366 0000769C BF[50FF0000]        <1> 	mov	edi, Cmd_Exit
  1367 000076A1 E8BA030000          <1> 	call	cmp_cmd	
  1368 000076A6 7208                <1> 	jc	short cmp_cmd_date
  1369                              <1> 
  1370 000076A8 C605[984B0100]01    <1>         mov     byte [Program_Exit], 1
  1371 000076AF C3                  <1>         retn
  1372                              <1> 
  1373                              <1> cmp_cmd_date:
  1374 000076B0 B104                <1> 	mov	cl, 4
  1375 000076B2 BF[6CFF0000]        <1> 	mov	edi, Cmd_Date
  1376 000076B7 E8A4030000          <1> 	call	cmp_cmd	
  1377 000076BC 720B                <1>         jc	short cmp_cmd_time
  1378                              <1> 	
  1379 000076BE E8D0F7FFFF          <1> 	call	show_date
  1380 000076C3 E80FF8FFFF          <1> 	call	set_date
  1381 000076C8 C3                  <1> 	retn
  1382                              <1> 
  1383                              <1> cmp_cmd_time:
  1384 000076C9 B104                <1> 	mov	cl, 4
  1385 000076CB BF[71FF0000]        <1> 	mov	edi, Cmd_Time
  1386 000076D0 E88B030000          <1>    	call	cmp_cmd	
  1387 000076D5 720B                <1> 	jc	short cmp_cmd_show
  1388                              <1> 
  1389 000076D7 E8C6FAFFFF          <1> 	call	show_time
  1390 000076DC E8F8FAFFFF          <1> 	call	set_time
  1391 000076E1 C3                  <1> 	retn
  1392                              <1> 
  1393                              <1> cmp_cmd_show:
  1394 000076E2 B104                <1> 	mov	cl, 4
  1395 000076E4 BF[82FF0000]        <1> 	mov	edi, Cmd_Show
  1396 000076E9 E872030000          <1>    	call	cmp_cmd	
  1397 000076EE 0F83EF090000        <1>         jnc     show_file
  1398                              <1> 
  1399                              <1> cmp_cmd_echo:
  1400 000076F4 B104                <1> 	mov	cl, 4
  1401 000076F6 BF[BEFF0000]        <1> 	mov	edi, Cmd_Echo
  1402 000076FB E860030000          <1>    	call	cmp_cmd	
  1403 00007700 721B                <1> 	jc	short cmp_cmd_copy
  1404                              <1> 
  1405                              <1> 	; 14/04/2016
  1406 00007702 56                  <1> 	push	esi
  1407                              <1> cmd_echo_asciiz:
  1408 00007703 46                  <1>         inc	esi
  1409 00007704 8A06                <1> 	mov	al, [esi]
  1410 00007706 3C20                <1> 	cmp	al, 20h
  1411 00007708 73F9                <1> 	jnb	short cmd_echo_asciiz
  1412 0000770A C60600              <1> 	mov	byte [esi], 0                 
  1413 0000770D 5E                  <1> 	pop	esi  
  1414 0000770E E8AAEBFFFF          <1> 	call	print_msg
  1415 00007713 BE[980B0100]        <1> 	mov	esi, NextLine
  1416                              <1> 	;call	print_msg   
  1417                              <1> 	;retn
  1418 00007718 E9A0EBFFFF          <1> 	jmp	print_msg
  1419                              <1> 
  1420                              <1> cmp_cmd_copy:
  1421 0000771D B104                <1> 	mov	cl, 4
  1422 0000771F BF[A5FF0000]        <1> 	mov	edi, Cmd_Copy
  1423 00007724 E837030000          <1>    	call	cmp_cmd	
  1424 00007729 0F8305180000        <1> 	jnc	copy_file
  1425                              <1> 
  1426                              <1> cmp_cmd_move:
  1427 0000772F B104                <1> 	mov	cl, 4
  1428 00007731 BF[AAFF0000]        <1> 	mov	edi, Cmd_Move
  1429 00007736 E825030000          <1>    	call	cmp_cmd	
  1430 0000773B 0F8399160000        <1> 	jnc	move_file
  1431                              <1> 
  1432                              <1> cmp_cmd_path:
  1433 00007741 B104                <1> 	mov	cl, 4
  1434 00007743 BF[AFFF0000]        <1> 	mov	edi, Cmd_Path
  1435 00007748 E813030000          <1>    	call	cmp_cmd	
  1436 0000774D 0F83391A0000        <1> 	jnc	set_get_path
  1437                              <1> 
  1438                              <1> cmp_cmd_beep:
  1439 00007753 B104                <1> 	mov	cl, 4
  1440 00007755 BF[DCFF0000]        <1> 	mov	edi, Cmd_Beep
  1441 0000775A E801030000          <1>    	call	cmp_cmd	
  1442 0000775F 720B                <1> 	jc	short cmp_cmd_find
  1443                              <1> 	; 13/05/2016
  1444 00007761 8A3D[0E420100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  1445 00007767 E926A6FFFF          <1> 	jmp	beeper
  1446                              <1> 
  1447                              <1> cmp_cmd_find:
  1448 0000776C B104                <1> 	mov	cl, 4
  1449 0000776E BF[B9FF0000]        <1> 	mov	edi, Cmd_Find
  1450 00007773 E8E8020000          <1>    	call	cmp_cmd	
  1451 00007778 0F82C5020000        <1>         jc      cmp_cmd_external
  1452                              <1> 
  1453                              <1> 	;call	find_and_list_files
  1454 0000777E E9EA220000          <1> 	jmp	find_and_list_files
  1455                              <1> 	;retn
  1456                              <1> 
  1457                              <1> c_1:
  1458 00007783 AD                  <1> 	lodsd
  1459                              <1> cmp_cmd_help:
  1460 00007784 3C3F                <1> 	cmp	al, '?'
  1461 00007786 751D                <1>         jne     short cmp_cmd_remark
  1462                              <1> 
  1463 00007788 BE[42FF0000]        <1> 	mov	esi, Command_List
  1464                              <1> cmd_help_next_w:
  1465 0000778D E82BEBFFFF          <1> 	call	print_msg
  1466                              <1> 
  1467 00007792 803E20              <1> 	cmp	byte [esi], 20h ; 0
  1468 00007795 7232                <1> 	jb	short cmd_help_retn
  1469                              <1> 	
  1470 00007797 56                  <1> 	push	esi
  1471 00007798 BE[4F0B0100]        <1> 	mov	esi, nextline
  1472 0000779D E81BEBFFFF          <1> 	call	print_msg
  1473 000077A2 5E                  <1> 	pop	esi
  1474 000077A3 EBE8                <1> 	jmp	short cmd_help_next_w	
  1475                              <1> 
  1476                              <1> cmp_cmd_remark:
  1477 000077A5 3C2A                <1> 	cmp	al, '*'
  1478 000077A7 0F8596020000        <1>         jne     cmp_cmd_external
  1479 000077AD 46                  <1> 	inc	esi
  1480 000077AE BF[08430100]        <1> 	mov	edi, Remark
  1481 000077B3 8A06                <1> 	mov	al, [esi]
  1482 000077B5 3C20                <1> 	cmp	al, 20h
  1483 000077B7 7707                <1> 	ja	short cmd_remark_write
  1484 000077B9 89FE                <1> 	mov	esi, edi ; Remark
  1485 000077BB E9FDEAFFFF          <1> 	jmp	print_msg
  1486                              <1> 
  1487                              <1> cmd_remark_write:
  1488 000077C0 AA                  <1> 	stosb
  1489 000077C1 AC                  <1> 	lodsb
  1490 000077C2 3C20                <1> 	cmp	al, 20h
  1491 000077C4 73FA                <1> 	jnb	short cmd_remark_write
  1492 000077C6 C60700              <1> 	mov	byte [edi], 0
  1493                              <1> 
  1494                              <1> cmd_help_retn:
  1495                              <1> cmd_remark_retn:
  1496                              <1> cd_retn:
  1497 000077C9 C3                  <1> 	retn
  1498                              <1> 
  1499                              <1> c_2:
  1500 000077CA 80F902              <1> 	cmp	cl, 2
  1501 000077CD 0F87B1000000        <1>         ja      c_3
  1502 000077D3 BE[56430100]        <1> 	mov	esi, CommandBuffer
  1503 000077D8 72A9                <1> 	jb	short c_1
  1504                              <1> 
  1505                              <1> cmp_cmd_cd:
  1506 000077DA 66AD                <1> 	lodsw
  1507 000077DC 663D4344            <1> 	cmp	ax, 'CD'
  1508 000077E0 7553                <1> 	jne	short cmp_cmd_drive
  1509 000077E2 46                  <1>         inc	esi
  1510                              <1> cd_0:
  1511 000077E3 668B06              <1> 	mov	ax, [esi]	
  1512 000077E6 3C20                <1> 	cmp	al, 20h
  1513 000077E8 76DF                <1> 	jna	short cd_retn
  1514                              <1> 	; 10/02/2016
  1515 000077EA 80FC3A              <1> 	cmp	ah, ':'
  1516 000077ED 7504                <1> 	jne	short cd_1
  1517 000077EF 46                  <1> 	inc	esi
  1518 000077F0 46                  <1> 	inc	esi
  1519 000077F1 EB4B                <1> 	jmp	short cd_2
  1520                              <1> 
  1521                              <1> cd_1:	; change current directory
  1522                              <1> 	; 29/11/2009
  1523                              <1> 	; AH = CDh	; to separate 'CD' command from others
  1524                              <1> 			; for restoring current directory
  1525                              <1> 			; 0CDh sign is for saving cdir into 
  1526                              <1> 			; DOS drv description table cdir area
  1527                              <1> 	
  1528 000077F3 B4CD                <1> 	mov	ah, 0CDh ; mov byte [CD_COMMAND], 0CDh 
  1529                              <1> 
  1530 000077F5 E858230000          <1> 	call	change_current_directory
  1531 000077FA 0F8372220000        <1>         jnc     change_prompt_dir_string
  1532                              <1> 
  1533                              <1> cd_error_messages:
  1534 00007800 3C03                <1> 	cmp	al, 3
  1535 00007802 740C                <1> 	je	short cd_path_not_found
  1536                              <1> 	; 16/10/2016 (15h -> 15)
  1537 00007804 3C0F                <1> 	cmp	al, 15 ; drive not ready error 
  1538 00007806 745B                <1> 	je	short cd_drive_not_ready
  1539 00007808 3C11                <1> 	cmp	al, 17 ; read error
  1540 0000780A 7457                <1> 	je	short cd_drive_not_ready	
  1541 0000780C 3C13                <1> 	cmp	al, 19 ; ; Bad directory/path name 
  1542 0000780E 7468                <1> 	je	short cd_command_failed
  1543                              <1> 
  1544                              <1> cd_path_not_found:
  1545 00007810 6650                <1> 	push	ax	
  1546 00007812 BE[E5010100]        <1> 	mov	esi, Msg_Dir_Not_Found
  1547 00007817 E8A1EAFFFF          <1> 	call	print_msg
  1548 0000781C 6658                <1> 	pop	ax
  1549 0000781E 3A25[A4420100]      <1> 	cmp	ah, [Current_Dir_Level]
  1550 00007824 0F8348220000        <1>         jnb     change_prompt_dir_string
  1551 0000782A 8825[A4420100]      <1> 	mov	[Current_Dir_Level], ah
  1552 00007830 E93D220000          <1>         jmp     change_prompt_dir_string   
  1553                              <1> 
  1554                              <1> cmp_cmd_drive: ; change current drive
  1555                              <1> 	; C:, D:, E: etc.
  1556 00007835 80FC3A              <1> 	cmp	ah, ':'
  1557 00007838 0F8505020000        <1>         jne     cmp_cmd_external
  1558                              <1> 
  1559                              <1> cd_2:	; 'CD C:', 'CD D:' ...
  1560 0000783E 803E20              <1> 	cmp	byte [esi], 20h
  1561 00007841 0F8706020000        <1>         ja      loc_cmd_failed
  1562                              <1> 
  1563 00007847 24DF                <1> 	and	al, 0DFh
  1564 00007849 2C41                <1> 	sub	al, 'A'
  1565 0000784B 0F82FC010000        <1>         jc      loc_cmd_failed
  1566                              <1> 
  1567 00007851 3A05[E2FE0000]      <1>         cmp     al, [Last_DOS_DiskNo]
  1568 00007857 770A                <1>         ja	short cd_drive_not_ready
  1569                              <1> 	
  1570 00007859 88C2                <1> 	mov	dl, al
  1571 0000785B E85DF3FFFF          <1> 	call 	change_current_drive
  1572 00007860 7201                <1> 	jc	short cd_drive_not_ready	
  1573 00007862 C3                  <1> 	retn
  1574                              <1> 
  1575                              <1> cd_drive_not_ready:
  1576 00007863 BE[A2010100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1577 00007868 E850EAFFFF          <1> 	call	print_msg
  1578                              <1> 
  1579                              <1> cd_fail_drive_restart:
  1580 0000786D 8A15[A6420100]      <1> 	mov	dl, [Current_Drv]
  1581                              <1> 	;call 	change_current_drive
  1582 00007873 E945F3FFFF          <1>         jmp     change_current_drive
  1583                              <1> 	;retn
  1584                              <1> 
  1585                              <1> cd_command_failed:
  1586 00007878 BE[83010100]        <1> 	mov	esi, Msg_Bad_Command
  1587 0000787D E83BEAFFFF          <1> 	call	print_msg
  1588 00007882 EBE9                <1> 	jmp	short cd_fail_drive_restart
  1589                              <1> 
  1590                              <1> c_3:
  1591                              <1> cmp_cmd_dir:
  1592 00007884 BF[42FF0000]        <1> 	mov	edi, Cmd_Dir
  1593 00007889 E8D2010000          <1> 	call	cmp_cmd	
  1594 0000788E 0F8371020000        <1> 	jnc	print_directory_list
  1595                              <1> 
  1596                              <1> cmp_cmd_cls:
  1597 00007894 B103                <1> 	mov	cl, 3
  1598 00007896 BF[7EFF0000]        <1> 	mov	edi, Cmd_Cls
  1599 0000789B E8C0010000          <1> 	call	cmp_cmd	
  1600 000078A0 0F832DEAFFFF        <1>         jnc	clear_screen
  1601                              <1> 
  1602                              <1> cmp_cmd_ver:
  1603 000078A6 B103                <1> 	mov	cl, 3
  1604 000078A8 BF[4CFF0000]        <1> 	mov	edi, Cmd_Ver
  1605 000078AD E8AE010000          <1> 	call	cmp_cmd	
  1606 000078B2 720A                <1> 	jc	short cmp_cmd_mem
  1607                              <1> 
  1608 000078B4 BE[EAFE0000]        <1> 	mov	esi, mainprog_Version
  1609                              <1> 	;call	print_msg
  1610 000078B9 E9FFE9FFFF          <1> 	jmp	print_msg
  1611                              <1> 	;retn
  1612                              <1> 
  1613                              <1> cmp_cmd_mem:
  1614 000078BE B103                <1> 	mov	cl, 3
  1615 000078C0 BF[B4FF0000]        <1> 	mov	edi, Cmd_Mem
  1616 000078C5 E896010000          <1> 	call	cmp_cmd	
  1617 000078CA 0F8384B9FFFF        <1> 	jnc	memory_info
  1618                              <1> 
  1619                              <1> cmp_cmd_del:
  1620 000078D0 B103                <1> 	mov	cl, 3
  1621 000078D2 BF[87FF0000]        <1> 	mov	edi, Cmd_Del
  1622 000078D7 E884010000          <1> 	call	cmp_cmd	
  1623 000078DC 0F832D0F0000        <1>         jnc     delete_file
  1624                              <1> 
  1625                              <1> cmp_cmd_set:
  1626 000078E2 B103                <1> 	mov	cl, 3
  1627 000078E4 BF[7AFF0000]        <1> 	mov	edi, Cmd_Set
  1628 000078E9 E872010000          <1> 	call	cmp_cmd	
  1629 000078EE 0F8310180000        <1>         jnc     set_get_env
  1630                              <1> 
  1631                              <1> cmp_cmd_run:
  1632 000078F4 B103                <1> 	mov	cl, 3
  1633 000078F6 BF[76FF0000]        <1> 	mov	edi, Cmd_Run
  1634 000078FB E860010000          <1> 	call	cmp_cmd	
  1635                              <1> 	; 07/05/2016
  1636 00007900 0F823D010000        <1>         jc      cmp_cmd_external
  1637 00007906 E9471E0000          <1> 	jmp	load_and_execute_file
  1638                              <1> c_5:
  1639                              <1> cmp_cmd_mkdir:
  1640 0000790B BF[9FFF0000]        <1> 	mov	edi, Cmd_Mkdir
  1641 00007910 E84B010000          <1> 	call	cmp_cmd	
  1642 00007915 0F838C0A0000        <1>         jnc     make_directory
  1643                              <1> 
  1644                              <1> cmp_cmd_rmdir:
  1645 0000791B B105                <1> 	mov	cl, 5
  1646 0000791D BF[99FF0000]        <1> 	mov	edi, Cmd_Rmdir
  1647 00007922 E839010000          <1> 	call	cmp_cmd	
  1648 00007927 0F83990B0000        <1>         jnc     delete_directory
  1649                              <1> 
  1650                              <1> cmp_cmd_chdir:
  1651 0000792D B105                <1> 	mov	cl, 5
  1652 0000792F BF[D6FF0000]        <1> 	mov	edi, Cmd_Chdir
  1653 00007934 E827010000          <1> 	call	cmp_cmd	
  1654 00007939 0F8204010000        <1>         jc      cmp_cmd_external
  1655                              <1> 
  1656 0000793F E99FFEFFFF          <1> 	jmp	cd_0
  1657                              <1> 
  1658                              <1> c_6:
  1659 00007944 80F906              <1> 	cmp	cl, 6
  1660 00007947 0F87DF000000        <1>         ja      c_8
  1661 0000794D 72BC                <1> 	jb	short c_5
  1662                              <1> cmp_cmd_prompt:
  1663 0000794F BF[55FF0000]        <1> 	mov	edi, Cmd_Prompt
  1664 00007954 E807010000          <1> 	call	cmp_cmd	
  1665 00007959 722E                <1>         jc	short cmp_cmd_volume
  1666                              <1> get_prompt_name_fchar:
  1667 0000795B AC                  <1> 	lodsb
  1668 0000795C 3C20                <1> 	cmp	al, 20h
  1669 0000795E 74FB                <1> 	je	short get_prompt_name_fchar
  1670 00007960 7712                <1> 	ja	short loc_change_prompt_label
  1671 00007962 BE[36FF0000]        <1> 	mov	esi, TRDOSPromptLabel
  1672 00007967 C7065452444F        <1> 	mov	dword [esi], "TRDO"
  1673 0000796D 66C746045300        <1>        	mov	word [esi+4], "S" 
  1674                              <1> loc_cmd_prompt_return:
  1675 00007973 C3                  <1> 	retn
  1676                              <1> loc_change_prompt_label:
  1677 00007974 66B90B00            <1> 	mov	cx, 11
  1678 00007978 BF[36FF0000]        <1> 	mov	edi, TRDOSPromptLabel
  1679                              <1> put_char_new_prompt_label:
  1680 0000797D AA                  <1> 	stosb
  1681 0000797E AC                  <1> 	lodsb
  1682 0000797F 3C20                <1> 	cmp	al, 20h
  1683 00007981 7202                <1> 	jb	short pass_put_new_prompt_label
  1684 00007983 E2F8                <1> 	loop	put_char_new_prompt_label
  1685                              <1> pass_put_new_prompt_label:
  1686 00007985 C60700              <1> 	mov	byte [edi], 0
  1687 00007988 C3                  <1> 	retn
  1688                              <1> 
  1689                              <1> cmp_cmd_volume:
  1690 00007989 B106                <1> 	mov	cl, 6
  1691 0000798B BF[5CFF0000]        <1> 	mov	edi, Cmd_Volume
  1692 00007990 E8CB000000          <1> 	call	cmp_cmd	
  1693 00007995 7255                <1>         jc	short cmp_cmd_attrib
  1694                              <1> 
  1695                              <1> cmd_vol1:
  1696 00007997 AC                  <1> 	lodsb
  1697 00007998 3C20                <1> 	cmp	al, 20h
  1698 0000799A 7707                <1> 	ja	short cmd_vol2
  1699 0000799C A0[A6420100]        <1> 	mov	al, [Current_Drv]
  1700 000079A1 EB3D                <1> 	jmp	short cmd_vol4
  1701                              <1> cmd_vol2:
  1702 000079A3 3C41                <1> 	cmp	al, 'A'
  1703 000079A5 0F82A2000000        <1>         jb      loc_cmd_failed
  1704 000079AB 3C7A                <1> 	cmp	al, 'z'
  1705 000079AD 0F879A000000        <1>         ja      loc_cmd_failed
  1706 000079B3 3C5A                <1> 	cmp	al, 'Z'
  1707 000079B5 760A                <1> 	jna	short cmd_vol3
  1708 000079B7 3C61                <1> 	cmp	al, 'a'
  1709 000079B9 0F828E000000        <1>         jb      loc_cmd_failed
  1710 000079BF 24DF                <1> 	and	al, 0DFh
  1711                              <1> cmd_vol3:
  1712 000079C1 8A26                <1> 	mov	ah, [esi]
  1713 000079C3 80FC3A              <1> 	cmp	ah, ':'
  1714 000079C6 0F8581000000        <1>         jne     loc_cmd_failed
  1715 000079CC 2C41                <1> 	sub	al, 'A'
  1716 000079CE 3A05[E2FE0000]      <1>         cmp     al, [Last_DOS_DiskNo]
  1717 000079D4 760A                <1> 	jna	short cmd_vol4
  1718                              <1> 
  1719 000079D6 BE[A2010100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1720 000079DB E9DDE8FFFF          <1> 	jmp	print_msg
  1721                              <1> 	
  1722                              <1> cmd_vol4:
  1723 000079E0 E896FAFFFF          <1> 	call	print_volume_info
  1724 000079E5 0F8278FEFFFF        <1>         jc      cd_drive_not_ready
  1725 000079EB C3                  <1> 	retn
  1726                              <1> 
  1727                              <1> cmp_cmd_attrib:
  1728 000079EC B106                <1> 	mov	cl, 6
  1729 000079EE BF[8BFF0000]        <1> 	mov	edi, Cmd_Attrib
  1730 000079F3 E868000000          <1> 	call	cmp_cmd	
  1731 000079F8 0F83310F0000        <1>         jnc     set_file_attributes
  1732                              <1> 
  1733                              <1> cmp_cmd_rename:
  1734 000079FE B106                <1> 	mov	cl, 6
  1735 00007A00 BF[92FF0000]        <1> 	mov	edi, Cmd_Rename
  1736 00007A05 E856000000          <1> 	call	cmp_cmd	
  1737 00007A0A 0F8367110000        <1>         jnc     rename_file
  1738                              <1> 
  1739                              <1> cmp_cmd_device:
  1740 00007A10 B106                <1> 	mov	cl, 6
  1741 00007A12 BF[C7FF0000]        <1> 	mov	edi, Cmd_Device
  1742 00007A17 E844000000          <1> 	call	cmp_cmd	
  1743 00007A1C 7225                <1>         jc	short cmp_cmd_external
  1744                              <1> 
  1745 00007A1E C3                  <1> 	retn
  1746                              <1> 
  1747                              <1> c_7:
  1748                              <1> cmp_cmd_devlist:
  1749 00007A1F BF[CEFF0000]        <1> 	mov	edi, Cmd_DevList
  1750 00007A24 E837000000          <1> 	call	cmp_cmd	
  1751 00007A29 7218                <1>         jc	short cmp_cmd_external
  1752                              <1> 
  1753                              <1> loc_cmd_return:
  1754 00007A2B C3                  <1> 	retn
  1755                              <1> 
  1756                              <1> c_8:
  1757 00007A2C 80F908              <1>         cmp	cl, 8
  1758 00007A2F 7712                <1> 	ja	short cmp_cmd_external
  1759 00007A31 72EC                <1> 	jb	short c_7
  1760                              <1> 
  1761                              <1> cmp_cmd_longname:
  1762 00007A33 BF[63FF0000]        <1> 	mov	edi, Cmd_LongName
  1763 00007A38 E823000000          <1> 	call	cmp_cmd	
  1764 00007A3D 0F8342060000        <1>         jnc     get_and_print_longname
  1765                              <1> 
  1766                              <1> cmp_cmd_external:
  1767                              <1> 	; 07/05/2016
  1768                              <1> 	; 22/04/2016
  1769 00007A43 BE[56430100]        <1> 	mov	esi, CommandBuffer
  1770 00007A48 E9051D0000          <1> 	jmp	loc_run_check_filename 
  1771                              <1> 
  1772                              <1> loc_cmd_failed:
  1773 00007A4D 803D[56430100]20    <1> 	cmp	byte [CommandBuffer], 20h
  1774 00007A54 76D5                <1> 	jna	short loc_cmd_return
  1775 00007A56 BE[83010100]        <1> 	mov	esi, Msg_Bad_Command
  1776                              <1> ;	call	print_msg
  1777                              <1> ;loc_cmd_return:
  1778                              <1> ;	retn
  1779 00007A5B E95DE8FFFF          <1> 	jmp	print_msg
  1780                              <1> 
  1781                              <1> cmp_cmd:
  1782                              <1> 	 ; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
  1783 00007A60 BE[56430100]        <1>          mov	esi, CommandBuffer
  1784                              <1>          ; edi = internal command word (ASCIIZ)
  1785                              <1> 	 ; ecx = command length (<=8)
  1786                              <1> cmp_cmd_1:
  1787 00007A65 AC                  <1> 	lodsb
  1788 00007A66 AE                  <1> 	scasb
  1789 00007A67 750D                <1> 	jne	short cmp_cmd_3
  1790 00007A69 E2FA                <1> 	loop	cmp_cmd_1
  1791 00007A6B AC                  <1>  	lodsb
  1792 00007A6C 3C20                <1> 	cmp	al, 20h
  1793 00007A6E 7703                <1> 	ja	short cmp_cmd_2
  1794 00007A70 30C0                <1> 	xor	al, al
  1795                              <1> 	; ZF = 1 -> internal command word matches
  1796 00007A72 C3                  <1> 	retn
  1797                              <1> cmp_cmd_2:
  1798                              <1> 	; ZF = 0 (CF = 0) -> external command word 	
  1799 00007A73 58                  <1> 	pop	eax ; no return to the caller from here 
  1800 00007A74 EBCD                <1> 	jmp	cmp_cmd_external	
  1801                              <1> cmp_cmd_3:
  1802 00007A76 F9                  <1> 	stc
  1803                              <1> 	; CF = 1 -> internal command word does not match
  1804 00007A77 C3                  <1> 	retn
  1805                              <1> 
  1806                              <1> loc_run_cmd_failed:
  1807                              <1> 	; 15/03/2016
  1808                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1809                              <1> 	; 07/12/2009 (CMD_INTR.ASM)	
  1810                              <1> 	; 29/11/2009
  1811                              <1> 
  1812 00007A78 E855000000          <1> 	call	restore_cdir_after_cmd_fail
  1813                              <1> 
  1814                              <1> loc_run_cmd_failed_cmp_al:
  1815                              <1> 	; End of Restore_CDIR code (29/11/2009)
  1816                              <1> 
  1817 00007A7D 3C01                <1> 	cmp	al, 1 ; Bad command or file name
  1818 00007A7F 74CC                <1> 	je	loc_cmd_failed
  1819                              <1> loc_run_dir_not_found:
  1820 00007A81 3C03                <1> 	cmp	al, 3
  1821 00007A83 750A                <1> 	jne	short loc_run_file_notfound_msg
  1822                              <1> 	; Path not found (MS-DOS Error Code = 3)
  1823 00007A85 BE[E5010100]        <1> 	mov	esi, Msg_Dir_Not_Found
  1824 00007A8A E92EE8FFFF          <1> 	jmp	print_msg
  1825                              <1> 
  1826                              <1> loc_run_file_notfound_msg:
  1827 00007A8F 3C02                <1> 	cmp	al, 2 ; File not found
  1828 00007A91 750A                <1> 	jne	short loc_run_file_drv_read_err
  1829                              <1> 
  1830                              <1> loc_print_file_notfound_msg: 
  1831 00007A93 BE[FC010100]        <1>         mov     esi, Msg_File_Not_Found
  1832                              <1> 	;call	proc_printmsg
  1833                              <1> 	;retn
  1834 00007A98 E920E8FFFF          <1> 	jmp	print_msg
  1835                              <1> 
  1836                              <1> loc_run_file_drv_read_err:
  1837                              <1> 	; Err: 17 (Read fault)
  1838 00007A9D 3C11                <1> 	cmp	al, 17 ; Drive not ready or read error
  1839 00007A9F 7404                <1> 	je	short loc_run_file_print_drv_read_err
  1840                              <1> 	;
  1841 00007AA1 3C0F                <1> 	cmp	al, 15 ; Drive not ready (or read error)
  1842 00007AA3 750A                <1> 	jne	short loc_run_file_toobig
  1843                              <1> 
  1844                              <1> loc_run_file_print_drv_read_err:
  1845 00007AA5 BE[A2010100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1846 00007AAA E90EE8FFFF          <1> 	jmp	print_msg
  1847                              <1> 
  1848                              <1> loc_run_file_toobig:
  1849 00007AAF 3C08                <1> 	cmp	al, 8 ; Not enough free memory to load&run file
  1850 00007AB1 750A                <1> 	jne	short loc_run_misc_error
  1851 00007AB3 BE[47020100]        <1> 	mov	esi, Msg_Insufficient_Memory
  1852 00007AB8 E900E8FFFF          <1> 	jmp	print_msg
  1853                              <1> 
  1854                              <1> 	; 15/03/2016
  1855                              <1> print_misc_error_msg:
  1856                              <1> loc_run_misc_error:
  1857                              <1> 	; AL = Error code
  1858 00007ABD E807B8FFFF          <1> 	call	bytetohex
  1859 00007AC2 66A3[7B020100]      <1>         mov     [error_code_hex], ax
  1860                              <1> 	
  1861 00007AC8 BE[5E020100]        <1> 	mov	esi, Msg_Error_Code 
  1862                              <1> 	;call	print_msg 
  1863                              <1> 	;retn
  1864                              <1> 
  1865 00007ACD E9EBE7FFFF          <1> 	jmp	print_msg
  1866                              <1> 
  1867                              <1> restore_cdir_after_cmd_fail:
  1868                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1869 00007AD2 50                  <1> 	push	eax
  1870 00007AD3 8A3D[064B0100]      <1> 	mov	bh, [RUN_CDRV] ; it is set at the beginning
  1871                              <1> 				; of the 'run' command.
  1872 00007AD9 3A3D[A6420100]      <1> 	cmp	bh, [Current_Drv]
  1873 00007ADF 7409                <1> 	je	short loc_run_restore_cdir
  1874 00007AE1 88FA                <1> 	mov	dl, bh
  1875 00007AE3 E8D5F0FFFF          <1> 	call	change_current_drive 
  1876 00007AE8 EB19                <1> 	jmp	short loc_run_err_pass_restore_cdir
  1877                              <1> 
  1878                              <1> loc_run_restore_cdir:
  1879 00007AEA 803D[E3FE0000]00    <1> 	cmp	byte [Restore_CDIR], 0
  1880 00007AF1 7610                <1> 	jna	short loc_run_err_pass_restore_cdir
  1881 00007AF3 30DB                <1> 	xor	bl, bl
  1882 00007AF5 0FB7F3              <1> 	movzx	esi, bx
  1883 00007AF8 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1884 00007AFE E871F1FFFF          <1> 	call	restore_current_directory
  1885                              <1> 
  1886                              <1> loc_run_err_pass_restore_cdir:
  1887 00007B03 58                  <1> 	pop	eax
  1888 00007B04 C3                  <1> 	retn
  1889                              <1> 
  1890                              <1> print_directory_list:
  1891                              <1> 	; 10/02/2016
  1892                              <1> 	; 08/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1893                              <1> 	; 06/12/2009 ('cmp_cmd_dir')	
  1894                              <1> 	;
  1895 00007B05 66C705[484C0100]00- <1> 	mov	word [AttributesMask], 0800h ; ..except volume names..
  1895 00007B0D 08                  <1>
  1896 00007B0E A0[A6420100]        <1> 	mov	al, [Current_Drv]
  1897 00007B13 A2[064B0100]        <1> 	mov	[RUN_CDRV], al
  1898                              <1> get_dfname_fchar:
  1899 00007B18 AC                  <1> 	lodsb
  1900 00007B19 3C20                <1> 	cmp	al, 20h
  1901 00007B1B 74FB                <1> 	je	short get_dfname_fchar
  1902 00007B1D 0F82A4000000        <1>         jb      loc_print_dir_call_all
  1903 00007B23 3C2D                <1> 	cmp	al, '-'
  1904 00007B25 7542                <1> 	jne	short loc_print_dir_call_flt
  1905                              <1> get_next_attr_char:
  1906 00007B27 AC                  <1> 	lodsb
  1907 00007B28 3C20                <1> 	cmp	al, 20h
  1908 00007B2A 74FB                <1> 	je	short get_next_attr_char
  1909 00007B2C 0F821BFFFFFF        <1>         jb      loc_cmd_failed
  1910 00007B32 24DF                <1> 	and	al, 0DFh
  1911 00007B34 3C44                <1> 	cmp	al, 'D' ; directories only ?
  1912 00007B36 7512                <1> 	jne	short pass_only_directories
  1913 00007B38 AC                  <1> 	lodsb
  1914 00007B39 3C20                <1> 	cmp	al, 20h
  1915 00007B3B 0F870CFFFFFF        <1>         ja      loc_cmd_failed
  1916 00007B41 800D[484C0100]10    <1> 	or	byte [AttributesMask], 10h ; ..directory..
  1917 00007B48 EB18                <1> 	jmp	short get_dfname_fchar_attr
  1918                              <1> pass_only_directories:
  1919 00007B4A 3C46                <1> 	cmp	al, 'F'	; files only ?
  1920 00007B4C 0F85B0000000        <1>         jne     check_attr_s
  1921 00007B52 AC                  <1> 	lodsb
  1922 00007B53 3C20                <1> 	cmp	al, 20h
  1923 00007B55 0F87F2FEFFFF        <1>         ja      loc_cmd_failed
  1924 00007B5B 800D[494C0100]10    <1> 	or	byte [AttributesMask+1], 10h ; ..except directories..
  1925                              <1> get_dfname_fchar_attr:
  1926 00007B62 AC                  <1> 	lodsb
  1927 00007B63 3C20                <1> 	cmp	al, 20h
  1928 00007B65 74FB                <1> 	je	short get_dfname_fchar_attr
  1929 00007B67 725E                <1> 	jb	short loc_print_dir_call_all
  1930                              <1> 
  1931                              <1> loc_print_dir_call_flt:
  1932 00007B69 4E                  <1> 	dec	esi
  1933 00007B6A BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  1934 00007B6F E8F2250000          <1> 	call	parse_path_name
  1935 00007B74 7308                <1>  	jnc	short loc_print_dir_change_drv_1
  1936 00007B76 3C01                <1> 	cmp	al, 1
  1937 00007B78 0F87FAFEFFFF        <1>         ja      loc_run_cmd_failed
  1938                              <1> 
  1939                              <1> loc_print_dir_change_drv_1:
  1940 00007B7E 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  1941                              <1> loc_print_dir_change_drv_2:
  1942 00007B84 3A15[064B0100]      <1> 	cmp	dl, [RUN_CDRV]
  1943 00007B8A 740B                <1> 	je	short loc_print_dir_change_directory 
  1944 00007B8C E82CF0FFFF          <1> 	call	change_current_drive
  1945 00007B91 0F82E1FEFFFF        <1>         jc      loc_run_cmd_failed
  1946                              <1> loc_print_dir_change_directory:
  1947 00007B97 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h ; 0 or 20h ?
  1948 00007B9E 761D                <1> 	jna	short pass_print_dir_change_directory
  1949                              <1> 
  1950 00007BA0 FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  1951 00007BA6 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  1952 00007BAB 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  1953 00007BAD E8A01F0000          <1> 	call	change_current_directory
  1954 00007BB2 0F82C0FEFFFF        <1>         jc      loc_run_cmd_failed
  1955                              <1> 
  1956                              <1> loc_print_dir_change_prompt_dir_string:
  1957 00007BB8 E8B51E0000          <1> 	call	change_prompt_dir_string
  1958                              <1> 
  1959                              <1> pass_print_dir_change_directory:
  1960 00007BBD BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  1961 00007BC2 803E20              <1> 	cmp	byte [esi], 20h ; ; 0 or 20h ?
  1962 00007BC5 7706                <1> 	ja	short loc_print_dir_call
  1963                              <1> 
  1964                              <1> loc_print_dir_call_all:
  1965 00007BC7 C7062A2E2A00        <1> 	mov	dword [esi], '*.*'
  1966                              <1> loc_print_dir_call:
  1967 00007BCD E87E000000          <1> 	call	print_directory
  1968                              <1> 
  1969 00007BD2 8A15[064B0100]      <1> 	mov	dl, [RUN_CDRV]  ; it is set at the beginning
  1970 00007BD8 3A15[A6420100]      <1> 	cmp	dl, [Current_Drv]
  1971 00007BDE 7406                <1> 	je	short loc_print_dir_call_restore_cdir_retn
  1972 00007BE0 E8D8EFFFFF          <1> 	call	change_current_drive 
  1973 00007BE5 C3                  <1> 	retn
  1974                              <1> 
  1975                              <1> loc_print_dir_call_restore_cdir_retn:
  1976 00007BE6 803D[E3FE0000]00    <1> 	cmp	byte [Restore_CDIR], 0
  1977 00007BED 7610                <1> 	jna	short pass_print_dir_call_restore_cdir_retn
  1978                              <1> 
  1979 00007BEF BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1980 00007BF4 31C0                <1> 	xor	eax, eax
  1981 00007BF6 88D4                <1> 	mov	ah, dl
  1982 00007BF8 01C6                <1> 	add	esi, eax
  1983                              <1> 
  1984 00007BFA E875F0FFFF          <1> 	call	restore_current_directory
  1985                              <1> 
  1986                              <1> pass_print_dir_call_restore_cdir_retn:
  1987 00007BFF C3                  <1> 	retn
  1988                              <1> 
  1989                              <1> check_attr_s_cap:
  1990 00007C00 24DF                <1> 	and	al, 0DFh
  1991                              <1> check_attr_s:
  1992 00007C02 3C53                <1> 	cmp	al, 'S'
  1993 00007C04 7514                <1> 	jne	short pass_attr_s
  1994 00007C06 800D[484C0100]04    <1> 	or	byte [AttributesMask], 4 ; system
  1995 00007C0D AC                  <1> 	lodsb
  1996 00007C0E 3C20                <1> 	cmp	al, 20h
  1997 00007C10 0F844CFFFFFF        <1>         je      get_dfname_fchar_attr
  1998 00007C16 72AF                <1> 	jb	short loc_print_dir_call_all
  1999 00007C18 24DF                <1> 	and	al, 0DFh
  2000                              <1> pass_attr_s:
  2001 00007C1A 3C48                <1> 	cmp	al, 'H'
  2002 00007C1C 7514                <1> 	jne	short pass_attr_h
  2003 00007C1E 800D[484C0100]02    <1> 	or	byte [AttributesMask], 2 ; hidden
  2004                              <1> pass_attr_shr:
  2005 00007C25 AC                  <1> 	lodsb
  2006 00007C26 3C20                <1> 	cmp	al, 20h
  2007 00007C28 0F8434FFFFFF        <1>         je      get_dfname_fchar_attr
  2008 00007C2E 7297                <1> 	jb	short loc_print_dir_call_all
  2009 00007C30 EBCE                <1> 	jmp	short check_attr_s_cap
  2010                              <1> 
  2011                              <1> pass_attr_h:
  2012 00007C32 3C52                <1> 	cmp	al, 'R'
  2013 00007C34 7509                <1> 	jne	short pass_attr_r
  2014 00007C36 800D[484C0100]01    <1> 	or	byte [AttributesMask], 1 ; read only
  2015 00007C3D EBE6                <1> 	jmp	short pass_attr_shr
  2016                              <1> 
  2017                              <1> pass_attr_r:
  2018 00007C3F 3C41                <1> 	cmp	al, 'A'
  2019 00007C41 0F8506FEFFFF        <1>         jne     loc_cmd_failed
  2020 00007C47 800D[484C0100]20    <1> 	or	byte [AttributesMask], 20h ; archive
  2021 00007C4E EBD5                <1> 	jmp	short pass_attr_shr
  2022                              <1> 
  2023                              <1> print_directory:
  2024                              <1> 	; 13/05/2016
  2025                              <1> 	; 11/02/2016
  2026                              <1> 	; 10/02/2016
  2027                              <1> 	; 08/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2028                              <1> 	; 30/10/2010 ('proc_print_directory')	
  2029                              <1> 	; 19/09/2009
  2030                              <1> 	; 2005 
  2031                              <1> 	; INPUT ->
  2032                              <1> 	;	ESI = Asciiz File/Dir Name Address
  2033                              <1> 
  2034 00007C50 56                  <1> 	push	esi
  2035                              <1> 
  2036 00007C51 29C0                <1> 	sub	eax, eax
  2037                              <1> 
  2038 00007C53 66A3[D44C0100]      <1> 	mov	word [Dir_Count], ax ; 0
  2039 00007C59 66A3[D24C0100]      <1> 	mov 	word [File_Count], ax ; 0
  2040 00007C5F A3[D64C0100]        <1> 	mov 	dword [Total_FSize], eax ; 0
  2041                              <1> 
  2042 00007C64 E86AE6FFFF          <1> 	call    clear_screen
  2043                              <1> 	
  2044 00007C69 31C9                <1> 	xor	ecx, ecx	
  2045 00007C6B 8A2D[A6420100]      <1> 	mov     ch, [Current_Drv] ; DirBuff_Drv - 'A'
  2046 00007C71 A0[A7420100]        <1> 	mov     al, [Current_Dir_Drv] 
  2047 00007C76 A2[A0000100]        <1> 	mov     [Dir_Drive_Name], al
  2048 00007C7B BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2049 00007C80 01CE                <1> 	add	esi, ecx
  2050                              <1> 
  2051 00007C82 E86EF9FFFF          <1> 	call	move_volume_name_and_serial_no
  2052 00007C87 730C                <1> 	jnc	short print_dir_strlen_check
  2053                              <1> 
  2054 00007C89 5E                  <1> 	pop	esi
  2055 00007C8A 8A3D[0E420100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  2056                              <1> 	;call	beeper
  2057                              <1> 	;retn
  2058 00007C90 E9FDA0FFFF          <1> 	jmp	beeper  ; beep ! and return
  2059                              <1> 
  2060                              <1> print_dir_strlen_check:
  2061 00007C95 BE[A9420100]        <1> 	mov	esi, Current_Dir_Root
  2062 00007C9A BF[3D010100]        <1> 	mov	edi, Dir_Str_Root
  2063                              <1> 	
  2064                              <1> 	;xor	ecx, ecx
  2065 00007C9F 8A0D[05430100]      <1>         mov     cl, [Current_Dir_StrLen]
  2066 00007CA5 FEC1                <1> 	inc	cl
  2067 00007CA7 80F940              <1> 	cmp	cl, 64
  2068 00007CAA 760D                <1> 	jna	short pass_print_dir_strlen_shorting
  2069 00007CAC 46                  <1> 	inc	esi
  2070 00007CAD 01CE                <1> 	add	esi, ecx
  2071 00007CAF 83EE40              <1> 	sub	esi, 64 
  2072 00007CB2 47                  <1> 	inc	edi
  2073 00007CB3 B82E2E2E20          <1> 	mov	eax, '... ' 
  2074 00007CB8 AB                  <1> 	stosd
  2075                              <1>  
  2076                              <1> pass_print_dir_strlen_shorting:
  2077 00007CB9 F3A4                <1> 	rep	movsb
  2078                              <1> 
  2079 00007CBB BE[93000100]        <1> 	mov	esi, Dir_Drive_Str
  2080 00007CC0 E8F8E5FFFF          <1> 	call	print_msg
  2081                              <1> 
  2082 00007CC5 BE[F2000100]        <1> 	mov	esi, Vol_Serial_Header
  2083 00007CCA E8EEE5FFFF          <1> 	call	print_msg
  2084                              <1> 
  2085 00007CCF BE[32010100]        <1> 	mov	esi, Dir_Str_Header
  2086 00007CD4 E8E4E5FFFF          <1> 	call	print_msg
  2087                              <1> 	
  2088 00007CD9 BE[4D0B0100]        <1> 	mov	esi, next2line
  2089 00007CDE E8DAE5FFFF          <1> 	call	print_msg
  2090                              <1> 
  2091                              <1> loc_print_dir_first_file:
  2092 00007CE3 C605[E94C0100]10    <1> 	mov	byte [PrintDir_RowCounter], 16
  2093 00007CEA 66A1[484C0100]      <1> 	mov	ax, [AttributesMask]
  2094 00007CF0 5E                  <1> 	pop	esi
  2095                              <1> 
  2096 00007CF1 E859020000          <1> 	call	find_first_file
  2097 00007CF6 0F826F010000        <1>         jc      loc_dir_ok
  2098                              <1> 	 
  2099                              <1> loc_dfname_use_this:
  2100                              <1> 	; bl =	File Attributes (bh = Long Name Entry Length)
  2101 00007CFC F6C310              <1> 	test	bl, 10h  ; Is it a directory?
  2102 00007CFF 741B                <1> 	jz	short loc_not_dir
  2103                              <1> 
  2104 00007D01 66FF05[D44C0100]    <1> 	inc	word [Dir_Count]
  2105 00007D08 89F2                <1> 	mov	edx, esi 	; FindFile_DirEntry address
  2106 00007D0A BE[82020100]        <1>  	mov	esi, Type_Dir	; '<DIR>     '
  2107 00007D0F BF[99020100]        <1> 	mov	edi, Dir_Or_FileSize
  2108                              <1> 	; move 10 bytes
  2109 00007D14 A5                  <1> 	movsd
  2110 00007D15 A5                  <1> 	movsd
  2111 00007D16 66A5                <1> 	movsw	    	
  2112 00007D18 89D6                <1> 	mov	esi, edx
  2113 00007D1A EB36                <1> 	jmp     short loc_dir_attribute
  2114                              <1> 
  2115                              <1> loc_not_dir:
  2116 00007D1C 66FF05[D24C0100]    <1> 	inc	word [File_Count]
  2117 00007D23 0105[D64C0100]      <1> 	add	[Total_FSize], eax
  2118                              <1> 
  2119 00007D29 B90A000000          <1> 	mov	ecx, 10  ; 32 bit divisor
  2120 00007D2E 89CF                <1> 	mov	edi, ecx
  2121 00007D30 81C7[99020100]      <1> 	add	edi, Dir_Or_FileSize
  2122                              <1> loc_dir_rdivide:
  2123 00007D36 29D2                <1> 	sub	edx, edx
  2124 00007D38 F7F1                <1> 	div	ecx 	 ; remainder in dl (< 10)
  2125 00007D3A 80C230              <1> 	add     dl, '0'	 ; to make visible (ascii)
  2126 00007D3D 4F                  <1> 	dec	edi
  2127 00007D3E 8817                <1> 	mov     [edi], dl
  2128 00007D40 21C0                <1> 	and	eax, eax
  2129 00007D42 75F2                <1> 	jnz	short loc_dir_rdivide
  2130                              <1> 
  2131                              <1> loc_dir_fill_space:
  2132 00007D44 81FF[99020100]      <1> 	cmp     edi, Dir_Or_FileSize
  2133 00007D4A 7606                <1> 	jna     short loc_dir_attribute
  2134 00007D4C 4F                  <1> 	dec     edi
  2135 00007D4D C60720              <1> 	mov     byte [edi], 20h
  2136 00007D50 EBF2                <1> 	jmp     short loc_dir_fill_space
  2137                              <1> 
  2138                              <1> loc_dir_attribute:
  2139 00007D52 C705[A4020100]2020- <1> 	mov	dword [File_Attribute], 20202020h
  2139 00007D5A 2020                <1>
  2140                              <1> 
  2141 00007D5C 80FB20              <1> 	cmp	bl, 20h  ; Is it an archive file?
  2142 00007D5F 7207                <1> 	jb	short loc_dir_pass_arch
  2143 00007D61 C605[A7020100]41    <1> 	mov	byte [File_Attribute+3], 'A'
  2144                              <1> 
  2145                              <1> loc_dir_pass_arch:
  2146 00007D68 80E307              <1> 	and	bl, 7
  2147 00007D6B 7428                <1> 	jz	short loc_dir_file_name
  2148 00007D6D 88DF                <1> 	mov	bh, bl
  2149 00007D6F 80E303              <1> 	and	bl, 3
  2150 00007D72 38DF                <1> 	cmp	bh, bl
  2151 00007D74 7607                <1> 	jna	short loc_dir_pass_s
  2152 00007D76 C605[A4020100]53    <1> 	mov	byte [File_Attribute], 'S'
  2153                              <1> 
  2154                              <1> loc_dir_pass_s:
  2155 00007D7D 80E302              <1> 	and     bl,2
  2156 00007D80 7407                <1> 	jz      short loc_dir_pass_h
  2157 00007D82 C605[A5020100]48    <1> 	mov     byte [File_Attribute+1], 'H'
  2158                              <1> loc_dir_pass_h:
  2159 00007D89 80E701              <1> 	and     bh,1
  2160 00007D8C 7407                <1> 	jz      short loc_dir_file_name
  2161 00007D8E C605[A6020100]52    <1> 	mov     byte [File_Attribute+2], 'R'
  2162                              <1> loc_dir_file_name:
  2163                              <1> 	;mov     bx, [esi+18h] ; Date
  2164                              <1> 	;mov     dx, [esi+16h] ; Time
  2165 00007D95 8B5E16              <1> 	mov	ebx, [esi+16h]
  2166 00007D98 89F1                <1> 	mov	ecx, esi ; FindFile_DirEntry address
  2167 00007D9A BF[8C020100]        <1> 	mov     edi, File_Name
  2168                              <1> 	; move 8 bytes
  2169 00007D9F A5                  <1> 	movsd
  2170 00007DA0 A5                  <1> 	movsd
  2171 00007DA1 C60720              <1> 	mov	byte [edi], 20h
  2172 00007DA4 47                  <1> 	inc	edi
  2173                              <1> 	; move 3 bytes
  2174 00007DA5 66A5                <1> 	movsw
  2175 00007DA7 A4                  <1> 	movsb
  2176 00007DA8 89CE                <1> 	mov	esi, ecx
  2177                              <1> 
  2178                              <1> Dir_Time_start:
  2179                              <1> 	;mov	ax, dx		; Time
  2180 00007DAA 6689D8              <1> 	mov	ax, bx
  2181 00007DAD 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2182 00007DB1 6683E03F            <1> 	and	ax, 0000111111b	; Minute Mask
  2183 00007DB5 D40A                <1> 	aam			; Q([AL]/10)->AH
  2184                              <1> 				; R([AL]/10)->AL
  2185                              <1> 				; [AL]+[AH]= Minute as BCD
  2186 00007DB7 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2187 00007DBB 86E0                <1> 	xchg	ah, al
  2188 00007DBD 66A3[B7020100]      <1> 	mov	[File_Minute], ax
  2189                              <1> 
  2190                              <1> 	;mov	al, dh
  2191 00007DC3 88F8                <1> 	mov	al, bh
  2192 00007DC5 C0E803              <1> 	shr	al, 3		; shift right 3 times
  2193 00007DC8 D40A                <1> 	aam			; [AL]+[AH]= Hours as BCD
  2194 00007DCA 660D3030            <1> 	or	ax, '00'
  2195 00007DCE 86E0                <1> 	xchg	ah, al
  2196 00007DD0 66A3[B4020100]      <1> 	mov     [File_Hour], ax
  2197                              <1> 
  2198 00007DD6 C1EB10              <1> 	shr	ebx, 16		; BX = Date
  2199                              <1> 	
  2200                              <1> Dir_Date_start:
  2201 00007DD9 6689D8              <1> 	mov	ax, bx		; Date
  2202 00007DDC 6683E01F            <1> 	and	ax, 00011111b	; Day Mask
  2203 00007DE0 D40A                <1> 	aam			; Q([AL]/10)->AH
  2204                              <1> 				; R([AL]/10)->AL
  2205                              <1> 				; [AL]+[AH]= Day as BCD
  2206 00007DE2 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2207 00007DE6 86C4                <1> 	xchg	al, ah
  2208                              <1> 
  2209 00007DE8 66A3[A9020100]      <1> 	mov	[File_Day], ax
  2210                              <1> 
  2211 00007DEE 6689D8              <1> 	mov	ax, bx
  2212 00007DF1 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2213 00007DF5 6683E00F            <1> 	and	ax, 00001111b	; Month Mask
  2214 00007DF9 D40A                <1> 	aam
  2215 00007DFB 660D3030            <1> 	or	ax, '00'
  2216 00007DFF 86E0                <1> 	xchg	ah, al
  2217 00007E01 66A3[AC020100]      <1> 	mov	[File_Month], ax
  2218                              <1> 
  2219 00007E07 6689D8              <1> 	mov	ax, bx
  2220 00007E0A 66C1E809            <1> 	shr     ax, 9
  2221 00007E0E 6683E07F            <1> 	and	ax, 01111111b	; Result = Year - 1980
  2222 00007E12 6605BC07            <1> 	add	ax, 1980
  2223                              <1> 
  2224 00007E16 B10A                <1> 	mov	cl, 10
  2225 00007E18 F6F1                <1> 	div	cl		; Q -> AL, R -> AH 
  2226 00007E1A 80CC30              <1> 	or	ah, '0'
  2227 00007E1D 8825[B2020100]      <1> 	mov	[File_Year+3], ah
  2228 00007E23 D40A                <1> 	aam
  2229 00007E25 86E0                <1> 	xchg	ah, al
  2230 00007E27 80CC30              <1> 	or	ah, '0'	  ; Convert to ASCII
  2231 00007E2A 8825[B1020100]      <1> 	mov	[File_Year+2], ah
  2232 00007E30 D40A                <1> 	aam
  2233 00007E32 86C4                <1> 	xchg	al, ah
  2234 00007E34 660D3030            <1> 	or	ax, '00'
  2235 00007E38 66A3[AF020100]      <1> 	mov	[File_Year], ax
  2236                              <1> 
  2237                              <1> loc_show_line:
  2238 00007E3E 56                  <1> 	push	esi
  2239 00007E3F BE[8C020100]        <1> 	mov     esi, File_Name
  2240 00007E44 E874E4FFFF          <1> 	call	print_msg
  2241 00007E49 BE[4F0B0100]        <1> 	mov	esi, nextline
  2242 00007E4E E86AE4FFFF          <1> 	call	print_msg
  2243 00007E53 5E                  <1> 	pop	esi
  2244                              <1> 
  2245 00007E54 FE0D[E94C0100]      <1> 	dec	byte [PrintDir_RowCounter]
  2246 00007E5A 0F84D4000000        <1>         jz      pause_dir_scroll
  2247                              <1> 
  2248                              <1> loc_next_entry:
  2249 00007E60 E899010000          <1> 	call	find_next_file
  2250 00007E65 0F8391FEFFFF        <1>         jnc     loc_dfname_use_this
  2251                              <1> 
  2252                              <1> loc_dir_ok:
  2253 00007E6B B90A000000          <1> 	mov     ecx, 10
  2254 00007E70 66A1[D44C0100]      <1> 	mov	ax, [Dir_Count]
  2255 00007E76 BF[CD020100]        <1> 	mov	edi, Decimal_Dir_Count
  2256 00007E7B 6639C8              <1> 	cmp	ax, cx ; 10
  2257 00007E7E 7216                <1> 	jb	short pass_ddc
  2258 00007E80 47                  <1> 	inc	edi
  2259 00007E81 6683F864            <1> 	cmp	ax, 100
  2260 00007E85 720F                <1> 	jb	short pass_ddc
  2261 00007E87 47                  <1> 	inc	edi
  2262 00007E88 663DE803            <1> 	cmp	ax, 1000
  2263 00007E8C 7208                <1> 	jb	short pass_ddc
  2264 00007E8E 47                  <1> 	inc	edi
  2265 00007E8F 663D1027            <1> 	cmp	ax, 10000
  2266 00007E93 7201                <1> 	jb	short pass_ddc
  2267 00007E95 47                  <1> 	inc	edi
  2268                              <1> pass_ddc:
  2269 00007E96 886F01              <1> 	mov     [edi+1], ch ; 0
  2270                              <1> loc_ddc_rediv:
  2271 00007E99 31D2                <1> 	xor     edx, edx
  2272 00007E9B 66F7F1              <1> 	div     cx	; 10
  2273 00007E9E 80C230              <1> 	add     dl, '0'
  2274 00007EA1 8817                <1> 	mov     [edi], dl
  2275 00007EA3 4F                  <1> 	dec     edi
  2276 00007EA4 6609C0              <1> 	or	ax, ax
  2277 00007EA7 75F0                <1> 	jnz	short loc_ddc_rediv
  2278                              <1> 
  2279 00007EA9 66A1[D24C0100]      <1> 	mov     ax, [File_Count]
  2280 00007EAF BF[BC020100]        <1> 	mov     edi, Decimal_File_Count
  2281 00007EB4 6639C8              <1> 	cmp     ax, cx ; 10
  2282 00007EB7 7216                <1> 	jb      short pass_dfc
  2283 00007EB9 47                  <1> 	inc     edi
  2284 00007EBA 6683F864            <1> 	cmp     ax, 100
  2285 00007EBE 720F                <1> 	jb      short pass_dfc
  2286 00007EC0 47                  <1> 	inc     edi
  2287 00007EC1 663DE803            <1> 	cmp     ax, 1000
  2288 00007EC5 7208                <1> 	jb      short pass_dfc
  2289 00007EC7 47                  <1> 	inc     edi
  2290 00007EC8 663D1027            <1> 	cmp     ax, 10000
  2291 00007ECC 7201                <1> 	jb      short pass_dfc
  2292 00007ECE 47                  <1> 	inc     edi
  2293                              <1> pass_dfc:
  2294                              <1> 	;mov    cx, 10
  2295 00007ECF 886F01              <1> 	mov     [edi+1], ch ; 00
  2296                              <1> loc_dfc_rediv:
  2297                              <1> 	;xor	dx, dx
  2298 00007ED2 30D2                <1> 	xor	dl, dl
  2299 00007ED4 66F7F1              <1> 	div	cx
  2300 00007ED7 80C230              <1> 	add	dl, '0'
  2301 00007EDA 8817                <1> 	mov	[edi], dl
  2302 00007EDC 4F                  <1> 	dec	edi
  2303 00007EDD 6609C0              <1> 	or	ax, ax
  2304 00007EE0 75F0                <1> 	jnz	short loc_dfc_rediv
  2305                              <1> 
  2306 00007EE2 BF[E84C0100]        <1> 	mov     edi, TFS_Dec_End
  2307                              <1>         ;mov    byte [edi], 0
  2308 00007EE7 A1[D64C0100]        <1> 	mov     eax, [Total_FSize]
  2309                              <1> 	;mov    ecx, 10
  2310                              <1> rediv_tfs_hex:
  2311                              <1> 	;sub	edx, edx
  2312 00007EEC 28D2                <1> 	sub	dl, dl
  2313 00007EEE F7F1                <1> 	div	ecx
  2314 00007EF0 80C230              <1> 	add	dl, '0'
  2315 00007EF3 4F                  <1> 	dec     edi
  2316 00007EF4 8817                <1> 	mov     [edi], dl
  2317 00007EF6 21C0                <1> 	and	eax, eax
  2318 00007EF8 75F2                <1> 	jnz	short rediv_tfs_hex
  2319                              <1> 	
  2320 00007EFA 893D[DA4C0100]      <1> 	mov	[TFS_Dec_Begin], edi
  2321 00007F00 BE[BA020100]        <1> 	mov	esi, Decimal_File_Count_Header
  2322 00007F05 E8B3E3FFFF          <1> 	call	print_msg
  2323 00007F0A BE[C2020100]        <1> 	mov	esi, str_files
  2324 00007F0F E8A9E3FFFF          <1> 	call	print_msg
  2325 00007F14 BE[D3020100]        <1> 	mov	esi, str_dirs
  2326 00007F19 E89FE3FFFF          <1> 	call	print_msg
  2327 00007F1E 8B35[DA4C0100]      <1> 	mov	esi, [TFS_Dec_Begin]
  2328 00007F24 E894E3FFFF          <1> 	call	print_msg
  2329 00007F29 BE[E4020100]        <1> 	mov	esi, str_bytes
  2330 00007F2E E88AE3FFFF          <1> 	call	print_msg
  2331                              <1> 
  2332 00007F33 C3                  <1> 	retn
  2333                              <1> 
  2334                              <1> pause_dir_scroll:
  2335 00007F34 28E4                <1> 	sub	ah, ah           
  2336 00007F36 E8DB8CFFFF          <1> 	call	int16h
  2337 00007F3B 3C1B                <1> 	cmp	al, 1Bh
  2338 00007F3D 0F8428FFFFFF        <1>         je      loc_dir_ok
  2339 00007F43 C605[E94C0100]10    <1> 	mov	byte [PrintDir_RowCounter], 16 ; Reset counter
  2340 00007F4A E911FFFFFF          <1>         jmp     loc_next_entry
  2341                              <1> 
  2342                              <1> find_first_file:
  2343                              <1> 	; 11/02/2016
  2344                              <1> 	; 10/02/2016
  2345                              <1> 	; 08/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2346                              <1> 	; 09/10/2011
  2347                              <1> 	; 17/09/2009
  2348                              <1> 	; 2005
  2349                              <1> 	; INPUT ->
  2350                              <1> 	;	ESI = ASCIIZ File/Dir Name Address (in Current Directory)
  2351                              <1> 	;	AL = Attributes AND mask (The AND result must be equal to AL)
  2352                              <1> 	;	      bit 0 = Read Only
  2353                              <1> 	;	      bir 1 = Hidden
  2354                              <1> 	;	      bit 2 = System
  2355                              <1> 	;	      bit 3 = Volume Label
  2356                              <1> 	;	      bit 4 = Directory
  2357                              <1> 	;	      bit 5 = Archive
  2358                              <1> 	;	      bit 6 = Reserved, must be 0
  2359                              <1> 	;	      bit 7 = Reserved, must be 0
  2360                              <1> 	;       AH = Attributes Negative AND mask (The AND result must be ZERO)
  2361                              <1> 	;
  2362                              <1> 	; OUTPUT ->
  2363                              <1> 	;	CF = 1 -> Error, Error Code in EAX (AL)
  2364                              <1> 	;	CF = 0 ->
  2365                              <1> 	;	     ESI = Directory Entry (FindFile_DirEntry) Location
  2366                              <1> 	;	     EDI = Directory Buffer Directory Entry Location
  2367                              <1> 	;	     EAX = File Size
  2368                              <1> 	;	      BL = Attributes of The File/Directory
  2369                              <1> 	;	      BH = Long Name Yes/No Status (>0 is YES)
  2370                              <1> 	;             DX > 0 : Ambiguous filename chars are used
  2371                              <1> 	;
  2372                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2373                              <1> 
  2374 00007F4F 66A3[9A4C0100]      <1> 	mov	[FindFile_AttributesMask], ax
  2375 00007F55 BF[9C4C0100]        <1> 	mov	edi, FindFile_DirEntry ; TR-DOS Fullfilename formatted buffer
  2376 00007F5A 31C0                <1> 	xor	eax, eax
  2377 00007F5C B90B000000          <1> 	mov	ecx, 11
  2378 00007F61 F3AB                <1> 	rep	stosd	; 44 bytes
  2379                              <1> 	;stosw		; +2 bytes 
  2380                              <1> 	    
  2381 00007F63 BF[8C4C0100]        <1> 	mov	edi, FindFile_Name ; FFF structure, offset 66
  2382 00007F68 39FE                <1> 	cmp	esi, edi
  2383 00007F6A 7408                <1> 	je	short loc_fff_mfn_ok
  2384 00007F6C 89FA                <1> 	mov	edx, edi 
  2385                              <1> 	 ; move 13 bytes
  2386 00007F6E A5                  <1> 	movsd
  2387 00007F6F A5                  <1> 	movsd
  2388 00007F70 A5                  <1> 	movsd
  2389 00007F71 AA                  <1> 	stosb
  2390 00007F72 89D6                <1> 	mov	esi, edx
  2391                              <1> loc_fff_mfn_ok:
  2392 00007F74 BF[3B4C0100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2393 00007F79 E81D210000          <1> 	call	convert_file_name
  2394 00007F7E 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2395                              <1> 
  2396 00007F80 66A1[9A4C0100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2397                              <1> 	;xor	ecx, ecx
  2398 00007F86 30C9                <1> 	xor	cl, cl  
  2399 00007F88 E8191E0000          <1> 	call	locate_current_dir_file
  2400 00007F8D 726E                <1> 	jc	short loc_fff_retn
  2401                              <1> 	; EDI = Directory Entry
  2402                              <1> 	; EBX = Directory Buffer Entry Index/Number
  2403                              <1> 
  2404                              <1> loc_fff_fnf_ln_check:
  2405 00007F8F 30ED                <1> 	xor	ch, ch 
  2406 00007F91 80F60F              <1> 	xor	dh, 0Fh
  2407 00007F94 7408                <1> 	jz	short loc_fff_longname_yes
  2408 00007F96 882D[994C0100]      <1> 	mov	[FindFile_LongNameYes], ch ; 0
  2409 00007F9C EB0C                <1> 	jmp	short loc_fff_longname_no
  2410                              <1> 
  2411                              <1> loc_fff_longname_yes:
  2412                              <1> 	;inc	byte [FindFile_LongNameYes]
  2413 00007F9E 8A0D[A64B0100]      <1> 	mov	cl, [LFN_EntryLength]  
  2414 00007FA4 880D[994C0100]      <1> 	mov	[FindFile_LongNameEntryLength], cl ; FindFile_LongNameYes
  2415                              <1> 
  2416                              <1> loc_fff_longname_no:
  2417                              <1> 	;mov	bx, [DirBuff_CurrentEntry]
  2418 00007FAA 66891D[C44C0100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2419 00007FB1 6689C2              <1> 	mov	dx, ax ; Ambigouos Filename chars used sign > 0
  2420                              <1> 
  2421 00007FB4 A0[A6420100]        <1> 	mov	al, [Current_Drv]
  2422 00007FB9 A2[4A4C0100]        <1> 	mov	[FindFile_Drv], al 
  2423                              <1> 
  2424 00007FBE A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2425 00007FC3 A3[BC4C0100]        <1> 	mov	[FindFile_DirFirstCluster], eax
  2426                              <1> 
  2427 00007FC8 A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2428 00007FCD A3[C04C0100]        <1> 	mov	[FindFile_DirCluster], eax
  2429                              <1> 
  2430 00007FD2 66FF05[C64C0100]    <1> 	inc	word [FindFile_MatchCounter]
  2431                              <1> 
  2432 00007FD9 89FB                <1> 	mov	ebx, edi
  2433 00007FDB 89FE                <1> 	mov	esi, edi
  2434 00007FDD BF[9C4C0100]        <1> 	mov	edi, FindFile_DirEntry
  2435 00007FE2 89F8                <1> 	mov	eax, edi
  2436 00007FE4 B108                <1> 	mov	cl, 8
  2437 00007FE6 F3A5                <1> 	rep	movsd
  2438 00007FE8 89C6                <1> 	mov	esi, eax
  2439 00007FEA 89DF                <1> 	mov	edi, ebx
  2440                              <1> 
  2441 00007FEC A1[B84C0100]        <1> 	mov	eax, [FindFile_DirEntry+28] ; File Size
  2442                              <1> 
  2443 00007FF1 8A1D[A74C0100]      <1> 	mov	bl, [FindFile_DirEntry+11] ; File Attributes 
  2444 00007FF7 8A3D[994C0100]      <1> 	mov	bh, [FindFile_LongNameYes]
  2445                              <1> 
  2446                              <1> 	;mov	cx, [DirBuff_EntryCounter]
  2447                              <1> 	;mov	[FindFile_DirEntryNumber], cx
  2448                              <1> 	;mov	cx, [FindFile_DirEntryNumber]
  2449                              <1> 	; ecx = 0
  2450                              <1> 
  2451                              <1> loc_fff_retn:
  2452 00007FFD C3                  <1> 	retn
  2453                              <1> 
  2454                              <1> find_next_file:
  2455                              <1> 	; 15/10/2016
  2456                              <1> 	; 10/02/2016
  2457                              <1> 	; 08/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2458                              <1> 	; 06/02/2011
  2459                              <1> 	; 17/09/2009
  2460                              <1> 	; 2005
  2461                              <1> 	; INPUT ->
  2462                              <1> 	;	NONE, Find First File Parameters
  2463                              <1> 	; OUTPUT ->
  2464                              <1> 	;	CF = 1 -> Error, Error Code in EAX (AL)
  2465                              <1> 	;	CF = 0 -> 
  2466                              <1> 	;	    ESI = Directory Entry (FindFile_DirEntry) Location
  2467                              <1> 	;	    EDI = Directory Buffer Directory Entry Location
  2468                              <1> 	;	    EAX = File Size
  2469                              <1> 	;	      BL = Attributes of The File/Directory
  2470                              <1> 	;	      BH = Long Name Yes/No Status (>0 is YES)
  2471                              <1> 	;             DX > 0 : Ambiguous filename chars are used 
  2472                              <1> 	;
  2473                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2474                              <1> 
  2475 00007FFE 66833D[C64C0100]00  <1> 	cmp	word [FindFile_MatchCounter], 0
  2476 00008006 7707                <1> 	ja	short loc_start_search_next_file
  2477                              <1> 
  2478                              <1> loc_fnf_stc_retn:
  2479 00008008 F9                  <1> 	stc
  2480                              <1> loc_fnf_ax12h_retn:
  2481 00008009 B80C000000          <1> 	mov	eax, 12 ; No More files
  2482                              <1> ;loc_fnf_retn:
  2483 0000800E C3                  <1> 	retn
  2484                              <1> 
  2485                              <1> loc_start_search_next_file:
  2486 0000800F 668B1D[C44C0100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  2487 00008016 6643                <1> 	inc	bx
  2488 00008018 663B1D[D34A0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2489 0000801F 7719                <1> 	ja	short loc_cont_search_next_file
  2490                              <1> 
  2491                              <1> loc_fnf_search:
  2492 00008021 BE[3B4C0100]        <1> 	mov	esi, Dir_Entry_Name
  2493 00008026 66A1[9A4C0100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2494 0000802C 6631C9              <1> 	xor	cx, cx
  2495 0000802F E8741E0000          <1> 	call	find_directory_entry
  2496 00008034 0F8355FFFFFF        <1>         jnc     loc_fff_fnf_ln_check
  2497                              <1> 
  2498                              <1> loc_cont_search_next_file:
  2499 0000803A 31DB                <1> 	xor	ebx, ebx
  2500 0000803C 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  2501 00008042 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2502 00008047 01DE                <1> 	add	esi, ebx
  2503                              <1> 
  2504 00008049 803D[A4420100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2505 00008050 7608                <1> 	jna	short loc_fnf_check_FAT_type
  2506 00008052 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2507 00008056 72B1                <1> 	jb	short loc_fnf_ax12h_retn
  2508 00008058 EB06                <1> 	jmp	short loc_fnf_check_next_cluster
  2509                              <1>  
  2510                              <1> loc_fnf_check_FAT_type:
  2511 0000805A 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
  2512 0000805E 72A9                <1> 	jb	short loc_fnf_ax12h_retn
  2513                              <1> 
  2514                              <1> loc_fnf_check_next_cluster:
  2515 00008060 A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2516 00008065 E813380000          <1> 	call	get_next_cluster
  2517 0000806A 7306                <1> 	jnc	short loc_fnf_load_next_dir_cluster
  2518 0000806C 09C0                <1> 	or	eax, eax
  2519 0000806E 7498                <1> 	jz	short loc_fnf_stc_retn
  2520                              <1> 	;mov	eax, 17 ;Drive not ready or read error
  2521 00008070 F5                  <1>  	cmc	;stc
  2522                              <1> loc_fnf_retn:
  2523 00008071 C3                  <1> 	retn
  2524                              <1> 
  2525                              <1> loc_fnf_load_next_dir_cluster:
  2526 00008072 E8EC390000          <1> 	call	load_FAT_sub_directory
  2527 00008077 72F8                <1> 	jc	short loc_fnf_retn
  2528 00008079 6631DB              <1> 	xor	bx, bx
  2529 0000807C 66891D[C44C0100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2530 00008083 EB9C                <1> 	jmp	short loc_fnf_search
  2531                              <1> 
  2532                              <1> get_and_print_longname:
  2533                              <1> 	; 16/10/2016
  2534                              <1> 	; 13/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2535                              <1> 	; 24/01/2010
  2536                              <1> 	; 17/10/2009 (CMD_INTR.ASM, 'cmp_cmd_longname')
  2537                              <1> get_longname_fchar:
  2538 00008085 803E20              <1> 	cmp	byte [esi], 20h
  2539 00008088 7701                <1> 	ja	short loc_find_longname
  2540                              <1> 	;jb	short loc_longname_retn
  2541                              <1> 	;inc	esi
  2542                              <1> 	;je	short get_longname_fchar
  2543                              <1> ;loc_longname_retn:
  2544 0000808A C3                  <1> 	retn
  2545                              <1> loc_find_longname:
  2546 0000808B E87F210000          <1> 	call	find_longname
  2547 00008090 7328                <1> 	jnc	short loc_print_longname
  2548                              <1> 	
  2549 00008092 08C0                <1> 	or	al, al
  2550 00008094 741A                <1> 	jz	short loc_longname_not_found
  2551                              <1> 	  
  2552                              <1> 	; 16/10/2016 (15h -> 15, 17)
  2553 00008096 3C0F                <1> 	cmp	al, 15
  2554 00008098 0F84C5F7FFFF        <1> 	je	cd_drive_not_ready ; drive not ready
  2555                              <1> 				   ; or
  2556 0000809E 3C11                <1> 	cmp	al, 17		   ; read error	
  2557 000080A0 0F84BDF7FFFF        <1> 	je	cd_drive_not_ready 
  2558                              <1> 
  2559                              <1> loc_ln_file_dir_not_found:
  2560 000080A6 BE[0E020100]        <1> 	mov	esi, Msg_File_Directory_Not_Found
  2561                              <1> 	;call	print_msg	
  2562                              <1>         ;retn
  2563 000080AB E90DE2FFFF          <1> 	jmp	print_msg
  2564                              <1> 
  2565                              <1> loc_longname_not_found:
  2566 000080B0 BE[2D020100]        <1>         mov     esi, Msg_LongName_Not_Found
  2567                              <1> 	;call	print_msg	
  2568                              <1>         ;retn
  2569 000080B5 E903E2FFFF          <1> 	jmp	print_msg
  2570                              <1> 
  2571                              <1> loc_print_longname:
  2572                              <1> 	;mov	esi, LongFileName
  2573 000080BA BF[A6430100]        <1> 	mov	edi, TextBuffer
  2574 000080BF 57                  <1> 	push	edi 
  2575 000080C0 3C00                <1> 	cmp	al, 0
  2576 000080C2 7708                <1> 	ja	short loc_print_longname_1
  2577                              <1> loc_print_FS_longname: ; Singlix FS (64 byte ASCIIZ file name)
  2578 000080C4 AC                  <1> 	lodsb
  2579 000080C5 AA                  <1> 	stosb  
  2580 000080C6 08C0                <1> 	or	al, al
  2581 000080C8 75FA                <1> 	jnz	short loc_print_FS_longname
  2582 000080CA EB07                <1> 	jmp	short loc_print_longname_2
  2583                              <1> 	;
  2584                              <1> loc_print_longname_1: ; MS Windows long name (UNICODE chars)
  2585 000080CC 66AD                <1> 	lodsw
  2586 000080CE AA                  <1> 	stosb  
  2587 000080CF 08C0                <1> 	or	al, al
  2588 000080D1 75F9                <1> 	jnz	short loc_print_longname_1
  2589                              <1> 	;
  2590                              <1> loc_print_longname_2:	
  2591 000080D3 5E                  <1> 	pop	esi
  2592 000080D4 E8E4E1FFFF          <1> 	call	print_msg
  2593 000080D9 BE[4F0B0100]        <1>   	mov	esi, nextline
  2594                              <1> 	;call	print_msg
  2595                              <1> 	;retn
  2596 000080DE E9DAE1FFFF          <1> 	jmp	print_msg	
  2597                              <1> 
  2598                              <1> show_file:
  2599                              <1> 	; 18/02/2016
  2600                              <1> 	; 17/02/2016
  2601                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2602                              <1> 	; 13/09/2011 (CMD_INTR.ASM, 'cmp_cmd_show')
  2603                              <1> 	; 08/11/2009
  2604                              <1> 
  2605                              <1> loc_show_parse_path_name:
  2606 000080E3 BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  2607 000080E8 E879200000          <1> 	call	parse_path_name
  2608 000080ED 0F825AF9FFFF        <1> 	jc	loc_cmd_failed
  2609                              <1> 
  2610                              <1> loc_show_check_filename_exists:
  2611 000080F3 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  2612 000080F8 803E20              <1> 	cmp	byte [esi], 20h
  2613 000080FB 0F864CF9FFFF        <1> 	jna	loc_cmd_failed
  2614                              <1> 
  2615                              <1> 	; 15/02/2016 (invalid file name check)
  2616 00008101 E809020000          <1> 	call	check_filename 	
  2617 00008106 730A                <1> 	jnc	short loc_show_change_drv
  2618                              <1> 
  2619 00008108 BE[FA020100]        <1> 	mov	esi, Msg_invalid_name_chars
  2620 0000810D E9ABE1FFFF          <1> 	jmp	print_msg
  2621                              <1>    
  2622                              <1> loc_show_change_drv:
  2623 00008112 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  2624 00008118 8835[064B0100]      <1> 	mov	[RUN_CDRV], dh
  2625 0000811E 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  2626 00008124 38F2                <1> 	cmp	dl, dh
  2627 00008126 740B                <1> 	je	short loc_show_change_directory
  2628 00008128 E890EAFFFF          <1> 	call	change_current_drive
  2629                              <1> 	;jc	loc_file_rw_cmd_failed
  2630 0000812D 0F8245F9FFFF        <1> 	jc	loc_run_cmd_failed
  2631                              <1> 
  2632                              <1> loc_show_change_directory:
  2633 00008133 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  2634 0000813A 7618                <1> 	jna	short loc_findload_showfile
  2635                              <1> 
  2636 0000813C FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  2637 00008142 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  2638 00008147 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2639 00008149 E8041A0000          <1> 	call	change_current_directory
  2640                              <1> 	;jc	loc_file_rw_cmd_failed
  2641 0000814E 0F8224F9FFFF        <1> 	jc	loc_run_cmd_failed
  2642                              <1> 
  2643                              <1> ;loc_show_change_prompt_dir_string:
  2644                              <1> 	;call	change_prompt_dir_string
  2645                              <1> 
  2646                              <1> loc_findload_showfile:
  2647                              <1> 	; 15/02/2016
  2648 00008154 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  2649 00008159 BF[3B4C0100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2650 0000815E E8381F0000          <1> 	call	convert_file_name
  2651 00008163 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2652                              <1> 
  2653 00008165 28C0                <1> 	sub	al, al	; Attrib AND mask = 0
  2654                              <1> 	; Directory attribute : 10h
  2655                              <1> 	; Volume name attribute: 8h
  2656 00008167 B418                <1> 	mov	ah, 00011000b ; 18h (Attrib NAND, AND --> zero mask)
  2657                              <1> 	;
  2658 00008169 6631C9              <1> 	xor	cx, cx  
  2659 0000816C E8351C0000          <1> 	call	locate_current_dir_file
  2660                              <1> 	;jc	loc_file_rw_cmd_failed
  2661 00008171 0F8201F9FFFF        <1> 	jc	loc_run_cmd_failed
  2662                              <1> 
  2663                              <1> loc_show_load_file:
  2664                              <1> 	; EDI = Directory Entry
  2665 00008177 668B4714            <1> 	mov	ax, [edi+DirEntry_FstClusHI] ; First Cluster High Word
  2666 0000817B C1E010              <1> 	shl	eax, 16
  2667 0000817E 668B471A            <1> 	mov	ax, [edi+DirEntry_FstClusLO] ; First Cluster Low Word
  2668 00008182 A3[F44C0100]        <1> 	mov	[Show_Cluster], eax
  2669 00008187 8B471C              <1> 	mov	eax, [edi+DirEntry_FileSize] ; File Size
  2670 0000818A 21C0                <1> 	and	eax, eax ; Empty file !
  2671 0000818C 0F8491000000        <1>         jz      end_of_show_file 
  2672 00008192 A3[F84C0100]        <1> 	mov	[Show_FileSize], eax
  2673 00008197 31C0                <1> 	xor	eax, eax
  2674 00008199 A3[FC4C0100]        <1> 	mov	[Show_FilePointer], eax ; 0
  2675 0000819E 66A3[004D0100]      <1> 	mov	[Show_ClusterPointer], ax ; 0
  2676 000081A4 29DB                <1> 	sub	ebx, ebx
  2677 000081A6 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  2678 000081AC BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2679 000081B1 01DE                <1> 	add	esi, ebx
  2680 000081B3 8935[F04C0100]      <1> 	mov	[Show_LDDDT], esi ; Logical DOS Drv Description Table addr
  2681                              <1> 
  2682 000081B9 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0	
  2683 000081BD 7713                <1> 	ja	short loc_show_calculate_cluster_size
  2684                              <1> 	; Singlix FS
  2685                              <1> 	; First Cluster Number is FDT number (in compatibility buffer)
  2686 000081BF 8B15[F44C0100]      <1> 	mov	edx, [Show_Cluster] ; Compatibility dir. buffer value (FDT)	
  2687 000081C5 8915[EC4C0100]      <1> 	mov	[Show_FDT], edx
  2688 000081CB 31C0                <1> 	xor	eax, eax
  2689 000081CD A3[F44C0100]        <1> 	mov	[Show_Cluster], eax ; Sector index  = 0
  2690                              <1> 				    ; (next time it will be 1)			
  2691                              <1> loc_show_calculate_cluster_size:
  2692 000081D2 668B5E11            <1> 	mov	bx, [esi+LD_BPB+BPB_BytsPerSec] ; FAT 12-16-32 (512)
  2693                              <1> 	; BX = 512 = [esi+LD_FS_BytesPerSec] ; Singlix FS	
  2694 000081D6 8A4613              <1> 	mov	al, [esi+LD_BPB+BPB_SecPerClust] ; FAT 12-16-32 (<= 128)
  2695                              <1> 	; AL = 1 = [esi+LD_FS_Reserved2] ; SectPerClust for Singlix FS
  2696 000081D9 F7E3                <1> 	mul	ebx	
  2697                              <1> 
  2698                              <1> 	;cmp	eax, 65536 ; non-compatible (very big) cluster size
  2699                              <1> 	;ja	short end_of_show_file	
  2700 000081DB 66A3[024D0100]      <1> 	mov	[Show_ClusterSize], ax
  2701                              <1> 
  2702                              <1> loc_start_show_file:
  2703 000081E1 BE[4F0B0100]        <1> 	mov	esi, nextline
  2704 000081E6 E8D2E0FFFF          <1> 	call	print_msg
  2705                              <1> 
  2706 000081EB A1[F44C0100]        <1> 	mov	eax, [Show_Cluster]
  2707 000081F0 C605[044D0100]17    <1> 	mov	byte [Show_RowCount], 23
  2708                              <1> 
  2709                              <1> 	; 17/02/2016
  2710 000081F7 8B35[F04C0100]      <1> 	mov	esi, [Show_LDDDT]
  2711                              <1> 
  2712                              <1> loc_show_next_cluster:
  2713                              <1> 	; 15/02/2016
  2714 000081FD BB00000700          <1> 	mov	ebx, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  2715                              <1> 	; ESI = Logical DOS drv description table address
  2716 00008202 E89A380000          <1> 	call	read_cluster
  2717                              <1> 	;jc	loc_file_rw_cmd_failed
  2718 00008207 0F826BF8FFFF        <1> 	jc	loc_run_cmd_failed
  2719                              <1> 
  2720 0000820D 31DB                <1> 	xor 	ebx, ebx
  2721                              <1> loc_show_next_byte:
  2722 0000820F 803D[044D0100]00    <1> 	cmp	byte [Show_RowCount], 0
  2723 00008216 7521                <1> 	jne	short pass_show_wait_for_key
  2724 00008218 30E4                <1> 	xor	ah, ah
  2725 0000821A E8F789FFFF          <1> 	call	int16h
  2726 0000821F 3C1B                <1> 	cmp	al, 1Bh
  2727 00008221 750F                <1> 	jne	short pass_exit_show
  2728                              <1> end_of_show_file:
  2729                              <1> pass_show_file:
  2730 00008223 BE[4F0B0100]        <1> 	mov	esi, nextline
  2731 00008228 E890E0FFFF          <1> 	call	print_msg
  2732 0000822D E94D010000          <1> 	jmp	loc_file_rw_restore_retn
  2733                              <1> 
  2734                              <1> pass_exit_show:
  2735 00008232 C605[044D0100]14    <1> 	mov	byte [Show_RowCount], 20
  2736                              <1> pass_show_wait_for_key:
  2737 00008239 81C300000700        <1> 	add	ebx, Cluster_Buffer
  2738 0000823F 8A03                <1> 	mov	al, [ebx]
  2739 00008241 3C0D                <1> 	cmp	al, 0Dh
  2740 00008243 0F8590000000        <1>         jne     loc_show_check_tab_space
  2741 00008249 FE0D[044D0100]      <1> 	dec	byte [Show_RowCount]
  2742                              <1> pass_show_dec_rowcount:
  2743 0000824F B307                <1> 	mov	bl, 7 ; (light gray character color, black background)
  2744 00008251 8A3D[0E420100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2745 00008257 E8569AFFFF          <1> 	call	_write_tty
  2746                              <1> loc_show_check_eof:
  2747 0000825C FF05[FC4C0100]      <1> 	inc	dword [Show_FilePointer]
  2748 00008262 A1[FC4C0100]        <1> 	mov	eax, [Show_FilePointer]
  2749 00008267 3B05[F84C0100]      <1> 	cmp	eax, [Show_FileSize]
  2750 0000826D 73B4                <1> 	jnb	short end_of_show_file
  2751 0000826F 66FF05[004D0100]    <1> 	inc	word [Show_ClusterPointer]
  2752 00008276 0FB71D[004D0100]    <1> 	movzx	ebx, word [Show_ClusterPointer]
  2753                              <1> 
  2754                              <1> 	; 17/02/2016
  2755                              <1> 	; (sector boundary -9 bits- check, 512 = 0)
  2756 0000827D 66F7C3FF01          <1>         test    bx, 1FFh ;  1 to 511
  2757 00008282 758B                <1> 	jnz	short loc_show_next_byte
  2758                              <1> 
  2759                              <1> 	; 16/02/2016
  2760 00008284 8B35[F04C0100]      <1> 	mov	esi, [Show_LDDDT]
  2761                              <1> 	;
  2762 0000828A 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2763 0000828E 7719                <1> 	ja	short loc_show_check_fat_cluster_size
  2764                              <1> 
  2765                              <1> 	; Singlix FS
  2766                              <1> 	; 1 sector, more... (cluster size = 1 sector)
  2767 00008290 A1[F44C0100]        <1> 	mov	eax, [Show_Cluster]
  2768 00008295 40                  <1> 	inc	eax
  2769 00008296 A3[F44C0100]        <1> 	mov	[Show_Cluster], eax
  2770                              <1> 
  2771 0000829B 6621DB              <1> 	and	bx, bx ; 65536 -> 0
  2772 0000829E 0F856BFFFFFF        <1>         jnz	loc_show_next_byte
  2773 000082A4 E954FFFFFF          <1> 	jmp     loc_show_next_cluster
  2774                              <1> 	 
  2775                              <1> loc_show_check_fat_cluster_size:
  2776                              <1> 	; 17/02/2016
  2777 000082A9 663B1D[024D0100]    <1> 	cmp	bx, [Show_ClusterSize] ; cluster size in bytes
  2778 000082B0 0F8259FFFFFF        <1>         jb	loc_show_next_byte
  2779 000082B6 66C705[004D0100]00- <1> 	mov	word [Show_ClusterPointer], 0
  2779 000082BE 00                  <1>
  2780                              <1> 
  2781 000082BF A1[F44C0100]        <1> 	mov	eax, [Show_Cluster]
  2782                              <1> 	;mov	esi, [Show_LDDDT]
  2783                              <1> loc_show_get_next_cluster:
  2784 000082C4 E8B4350000          <1> 	call	get_next_cluster
  2785                              <1> 	;jc	loc_file_rw_cmd_failed
  2786 000082C9 0F82A9F7FFFF        <1> 	jc	loc_run_cmd_failed
  2787                              <1> loc_show_update_ccluster:
  2788 000082CF A3[F44C0100]        <1> 	mov	[Show_Cluster], eax			
  2789 000082D4 E924FFFFFF          <1>         jmp     loc_show_next_cluster
  2790                              <1> 
  2791                              <1> loc_show_check_tab_space:
  2792 000082D9 3C09                <1> 	cmp	al, 09h
  2793 000082DB 0F856EFFFFFF        <1>         jne     pass_show_dec_rowcount
  2794                              <1> loc_show_put_tab_space:
  2795 000082E1 8A3D[0E420100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2796 000082E7 E85596FFFF          <1> 	call	get_cpos
  2797                              <1> 	; dl = cursor column
  2798 000082EC 80E207              <1> 	and	dl, 7 ; 18/02/2016
  2799                              <1> 	;shr	bh, 1 ; [ACTIVE_PAGE]
  2800 000082EF 8A3D[0E420100]      <1> 	mov	bh, [ACTIVE_PAGE]
  2801 000082F5 B307                <1> 	mov	bl, 7 ; color attribute
  2802                              <1> loc_show_put_space_chars:
  2803 000082F7 B020                <1> 	mov	al, 20h ; space
  2804                              <1> 	;mov	bh, [ACTIVE_PAGE] ; [ptty]
  2805                              <1> 	;mov	bl, 7 ; color attribute
  2806 000082F9 6652                <1> 	push	dx
  2807 000082FB E8B299FFFF          <1> 	call	_write_tty
  2808 00008300 665A                <1> 	pop	dx
  2809                              <1> 	; 18/02/2016
  2810 00008302 80FA07              <1> 	cmp	dl, 7
  2811 00008305 0F8351FFFFFF        <1> 	jnb	loc_show_check_eof
  2812 0000830B FEC2                <1> 	inc	dl
  2813 0000830D EBE8                <1> 	jmp	short loc_show_put_space_chars
  2814                              <1> 
  2815                              <1> check_filename:
  2816                              <1> 	; 10/10/2016
  2817                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2818                              <1> 	; 07/08/2010 (FILE.ASM, 'proc_check_filename')
  2819                              <1> 	; 10/07/2010
  2820                              <1> 	; Derived from 'proc_check_filename'
  2821                              <1> 	; in the old TRDOS.ASM (09/02/2005).
  2822                              <1> 	;
  2823                              <1> 	; INPUT -> 
  2824                              <1> 	;	ESI = Dot File Name Location
  2825                              <1> 	; OUTPUT ->
  2826                              <1> 	;	cf = 1 -> error code in AL
  2827                              <1> 	;	     AL = ERR_INV_FILE_NAME (=26)
  2828                              <1> 	;		  Invalid file name chars   
  2829                              <1> 	;	cf = 0 -> valid file name
  2830                              <1> 	; 
  2831                              <1> 	;(EAX, ECX, EDI will be changed)
  2832                              <1> 
  2833                              <1> check_invalid_filename_chars:
  2834                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2835                              <1> 	; 10/07/2010 (FILE.ASM, 'proc_check_invalid_filename_chars')
  2836                              <1> 	; 10/02/2010
  2837                              <1> 	; Derived from 'proc_check_invalid_filename_chars'
  2838                              <1> 	; in the old TRDOS.ASM (09/02/2005).
  2839                              <1> 	;
  2840                              <1> 	; INPUT -> 
  2841                              <1> 	;	ESI = ASCIIZ FileName
  2842                              <1> 	; OUTPUT ->
  2843                              <1> 	;	cf = 1 -> invalid
  2844                              <1> 	;	cf = 0 -> valid
  2845                              <1> 	; 
  2846                              <1> 	;(EAX, ECX, EDI will be changed)
  2847                              <1>   
  2848 0000830F 56                  <1> 	push	esi
  2849                              <1> 
  2850 00008310 BF[E2FF0000]        <1>         mov     edi, invalid_fname_chars
  2851 00008315 AC                  <1> 	lodsb
  2852                              <1> check_filename_next_char:
  2853 00008316 B914000000          <1> 	mov	ecx, sizeInvFnChars
  2854 0000831B BF[E2FF0000]        <1> 	mov	edi, invalid_fname_chars
  2855                              <1> loc_scan_invalid_filename_char:
  2856 00008320 AE                  <1> 	scasb 
  2857 00008321 741F                <1> 	je	short loc_invalid_filename_stc 
  2858 00008323 E2FB                <1> 	loop	loc_scan_invalid_filename_char
  2859 00008325 AC                  <1> 	lodsb
  2860 00008326 3C1F                <1> 	cmp	al, 1Fh  ; 20h and above 
  2861 00008328 77EC                <1> 	ja	short check_filename_next_char
  2862                              <1> 
  2863                              <1> check_filename_dot:
  2864 0000832A 8B3424              <1> 	mov	esi, [esp]
  2865                              <1> 
  2866 0000832D B421                <1> 	mov	ah, 21h
  2867 0000832F B908000000          <1> 	mov	ecx, 8
  2868                              <1> loc_check_filename_next_char:
  2869 00008334 AC                  <1> 	lodsb
  2870 00008335 3C2E                <1> 	cmp	al, 2Eh
  2871 00008337 7511                <1> 	jne	short pass_check_fn_dot_check
  2872                              <1> loc_check_filename_ext_0:
  2873 00008339 AC                  <1> 	lodsb
  2874 0000833A 38E0                <1> 	cmp	al, ah ; 21h
  2875 0000833C 7205                <1> 	jb	short loc_invalid_filename
  2876 0000833E 3C2E                <1> 	cmp	al, 2Eh
  2877 00008340 7519                <1> 	jne	short loc_check_filename_ext_1
  2878                              <1> 
  2879                              <1> loc_invalid_filename_stc:
  2880                              <1> loc_check_fn_stc_rtn:
  2881 00008342 F9                  <1> 	stc
  2882                              <1> loc_invalid_filename:
  2883                              <1> 	; 10/10/2016 (0Bh -> 26)
  2884 00008343 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; (=26)
  2885                              <1> 	; Invalid file name chars
  2886                              <1> loc_check_fn_rtn:
  2887 00008348 5E                  <1> 	pop	esi
  2888 00008349 C3                  <1> 	retn
  2889                              <1> 
  2890                              <1> pass_check_fn_dot_check:
  2891 0000834A 38E0                <1> 	cmp	al, ah ; 21h
  2892 0000834C 7224                <1> 	jb	short loc_check_fn_clc_rtn
  2893 0000834E E2E4                <1> 	loop	loc_check_filename_next_char
  2894 00008350 AC                  <1> 	lodsb
  2895 00008351 38E0                <1> 	cmp	al, ah ; 21h
  2896 00008353 721D                <1> 	jb	short loc_check_fn_clc_rtn
  2897 00008355 3C2E                <1> 	cmp	al, 2Eh
  2898 00008357 75E9                <1> 	jne	short loc_check_fn_stc_rtn
  2899 00008359 EBDE                <1> 	jmp	short loc_check_filename_ext_0
  2900                              <1> 
  2901                              <1> loc_check_filename_ext_1:
  2902 0000835B AC                  <1> 	lodsb
  2903 0000835C 38E0                <1> 	cmp	al, ah ; 21h
  2904 0000835E 7212                <1> 	jb	short loc_check_fn_clc_rtn
  2905 00008360 3C2E                <1> 	cmp	al, 2Eh
  2906 00008362 74DE                <1> 	je	short loc_check_fn_stc_rtn
  2907 00008364 AC                  <1> 	lodsb
  2908 00008365 38E0                <1> 	cmp	al, ah ; 21h
  2909 00008367 7209                <1> 	jb	short loc_check_fn_clc_rtn
  2910 00008369 3C2E                <1> 	cmp	al, 2Eh
  2911 0000836B 74D5                <1> 	je	short loc_check_fn_stc_rtn
  2912 0000836D AC                  <1> 	lodsb
  2913 0000836E 38E0                <1> 	cmp	al, ah ; 21h
  2914 00008370 73D0                <1> 	jnb	short loc_check_fn_stc_rtn
  2915                              <1> 
  2916                              <1> loc_check_fn_clc_rtn:
  2917 00008372 5E                  <1> 	pop	esi
  2918 00008373 F8                  <1> 	clc
  2919 00008374 C3                  <1> 	retn
  2920                              <1> 
  2921                              <1> loc_print_deleted_message:
  2922 00008375 BE[CF030100]        <1> 	mov	esi, Msg_Deleted
  2923 0000837A E83EDFFFFF          <1> 	call	print_msg
  2924                              <1> 
  2925                              <1> 	;clc
  2926                              <1> 
  2927                              <1> loc_file_rw_restore_retn:
  2928                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2929                              <1> 	; 28/02/2010 (CMD_INTR.ASM)
  2930                              <1> loc_file_rw_cmd_failed:
  2931 0000837F 9C                  <1> 	pushf 
  2932 00008380 E84DF7FFFF          <1> 	call	restore_cdir_after_cmd_fail	
  2933 00008385 9D                  <1> 	popf
  2934 00008386 720D                <1> 	jc	short loc_file_rw_check_write_fault
  2935 00008388 C3                  <1> 	retn
  2936                              <1> 
  2937                              <1> loc_permission_denied:
  2938                              <1> 	; 27/02/2016
  2939 00008389 BE[DC030100]        <1> 	mov	esi, Msg_Permission_Denied
  2940 0000838E E82ADFFFFF          <1> 	call	print_msg
  2941 00008393 EBEA                <1> 	jmp	short loc_file_rw_restore_retn
  2942                              <1> 
  2943                              <1> loc_file_rw_check_write_fault:
  2944                              <1> 	;cmp	al, 1Dh ; Write Fault
  2945 00008395 3C12                <1>         cmp	al, 18 ; 05/11/2016
  2946 00008397 0F85E0F6FFFF        <1> 	jne     loc_run_cmd_failed_cmp_al
  2947 0000839D BE[C3010100]        <1> 	mov	esi, Msg_Not_Ready_Write_Err
  2948                              <1> 	;call	print_msg
  2949                              <1> 	;retn
  2950 000083A2 E916DFFFFF          <1> 	jmp	print_msg
  2951                              <1> 
  2952                              <1> make_directory:
  2953                              <1> 	; 21/02/2016 (TRDOS 386 =  TRDOS v2.0)
  2954                              <1> 	; 12/03/2011 (CMD_INTR.ASM, 'cmp_cmd_mkdir')
  2955                              <1> 	; 14/08/2010
  2956                              <1> 	; 10/07/2010
  2957                              <1> 	; 29/11/2009
  2958                              <1> 	;
  2959                              <1> get_mkdir_fchar:
  2960                              <1> 	; esi = directory name
  2961 000083A7 803E20              <1> 	cmp	byte [esi], 20h
  2962 000083AA 7701                <1>         ja	short loc_mkdir_parse_path_name
  2963                              <1> 
  2964                              <1> loc_mkdir_nodirname_retn:
  2965 000083AC C3                  <1> 	retn
  2966                              <1> 
  2967                              <1> loc_mkdir_parse_path_name:
  2968 000083AD BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  2969 000083B2 E8AF1D0000          <1>         call    parse_path_name
  2970 000083B7 0F8290F6FFFF        <1> 	jc	loc_cmd_failed
  2971                              <1> 
  2972                              <1> loc_mkdir_check_dirname_exists:
  2973 000083BD BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  2974 000083C2 803E20              <1> 	cmp	byte [esi], 20h
  2975 000083C5 0F8682F6FFFF        <1> 	jna	loc_cmd_failed
  2976 000083CB 8935[084D0100]      <1> 	mov	[DelFile_FNPointer], esi
  2977 000083D1 E839FFFFFF          <1> 	call	check_filename
  2978 000083D6 7259                <1> 	jc	short loc_mkdir_invalid_dir_name_chars
  2979                              <1> 
  2980                              <1> loc_mkdir_drv:
  2981 000083D8 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  2982 000083DE 8835[064B0100]      <1> 	mov	[RUN_CDRV], dh
  2983                              <1> 	
  2984 000083E4 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  2985 000083EA 38F2                <1> 	cmp	dl, dh
  2986 000083EC 7407                <1> 	je	short loc_mkdir_change_directory
  2987                              <1> 
  2988 000083EE E8CAE7FFFF          <1> 	call	change_current_drive
  2989 000083F3 728A                <1> 	jc	loc_file_rw_cmd_failed
  2990                              <1> 
  2991                              <1> loc_mkdir_change_directory:
  2992 000083F5 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  2993 000083FC 7614                <1> 	jna	short loc_mkdir_find_directory
  2994                              <1> 
  2995 000083FE FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  2996 00008404 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  2997 00008409 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2998 0000840B E842170000          <1> 	call	change_current_directory
  2999 00008410 722E                <1> 	jc	short loc_mkdir_check_error_code
  3000                              <1> 
  3001                              <1> ;loc_mkdir_change_prompt_dir_string:
  3002                              <1> 	;call	change_prompt_dir_string
  3003                              <1> 
  3004                              <1> loc_mkdir_find_directory:
  3005                              <1> 	;mov	esi, FindFile_Name
  3006 00008412 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3007                              <1> 	;xor	eax, eax
  3008 00008418 6631C0              <1> 	xor	ax, ax ; any name (dir, file, volume)
  3009 0000841B E82FFBFFFF          <1> 	call	find_first_file
  3010 00008420 721E                <1> 	jc	short loc_mkdir_check_error_code
  3011                              <1> 
  3012                              <1> loc_mkdir_directory_found:
  3013 00008422 BE[27030100]        <1> 	mov	esi, Msg_Name_Exists
  3014 00008427 E891DEFFFF          <1> 	call	print_msg
  3015                              <1> 
  3016 0000842C E94EFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3017                              <1> 
  3018                              <1> loc_mkdir_invalid_dir_name_chars:
  3019 00008431 BE[FA020100]        <1> 	mov	esi, Msg_invalid_name_chars
  3020 00008436 E882DEFFFF          <1> 	call	print_msg
  3021                              <1> 
  3022 0000843B E93FFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3023                              <1> 
  3024                              <1> loc_mkdir_check_error_code:
  3025 00008440 3C02                <1> 	cmp	al, 2
  3026                              <1> 	;je	short loc_mkdir_directory_not_found
  3027 00008442 7406                <1> 	je	short loc_mkdir_ask_for_yes_no
  3028 00008444 F9                  <1> 	stc
  3029 00008445 E935FFFFFF          <1>         jmp     loc_file_rw_cmd_failed
  3030                              <1> 
  3031                              <1> loc_mkdir_directory_not_found:
  3032                              <1> loc_mkdir_ask_for_yes_no:
  3033 0000844A BE[48030100]        <1> 	mov	esi, Msg_DoYouWantMkdir
  3034 0000844F E869DEFFFF          <1> 	call	print_msg
  3035 00008454 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3036 0000845A E85EDEFFFF          <1> 	call	print_msg
  3037 0000845F BE[67030100]        <1> 	mov	esi, Msg_YesNo
  3038 00008464 E854DEFFFF          <1> 	call	print_msg
  3039                              <1> 
  3040 00008469 C605[71030100]20    <1> 	mov	byte [Y_N_nextline], 20h
  3041                              <1> 
  3042                              <1> loc_mkdir_ask_again:
  3043 00008470 30E4                <1> 	xor	ah, ah
  3044 00008472 E89F87FFFF          <1> 	call	int16h
  3045 00008477 3C1B                <1> 	cmp	al, 1Bh
  3046                              <1> 	;je	short loc_do_not_make_directory
  3047 00008479 7447                <1> 	je	short loc_mkdir_y_n_escape
  3048 0000847B 24DF                <1> 	and	al, 0DFh ; y -> Y, n -> N
  3049 0000847D 3C59                <1> 	cmp	al, 'Y' ; 'yes'
  3050 0000847F 7404                <1> 	je	short loc_mkdir_yes_make_directory
  3051 00008481 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3052 00008483 75EB                <1> 	jne	short loc_mkdir_ask_again
  3053                              <1> 
  3054                              <1> loc_do_not_make_directory:
  3055                              <1> loc_mkdir_yes_make_directory:
  3056 00008485 A2[71030100]        <1> 	mov	[Y_N_nextline], al
  3057 0000848A 6650                <1> 	push	ax
  3058 0000848C BE[71030100]        <1> 	mov	esi, Y_N_nextline
  3059 00008491 E827DEFFFF          <1> 	call	print_msg
  3060 00008496 6658                <1> 	pop	ax
  3061                              <1> 	;cmp	al, 'Y' ; 'yes'
  3062                              <1> 	;cmc
  3063                              <1>         ;jnc	loc_file_rw_restore_retn
  3064 00008498 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3065 0000849A 0F84DFFEFFFF        <1>         je	loc_file_rw_restore_retn  
  3066                              <1> 
  3067                              <1> loc_mkdir_call_make_sub_directory:
  3068 000084A0 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3069 000084A6 B110                <1> 	mov	cl, 10h ; Directory attributes 
  3070 000084A8 E8B81D0000          <1> 	call	make_sub_directory
  3071                              <1> loc_rename_file_ok: ; 06/03/2016
  3072 000084AD 0F82CCFEFFFF        <1>         jc	loc_file_rw_cmd_failed
  3073                              <1> move_source_file_to_destination_OK:
  3074 000084B3 BE[75030100]        <1> 	mov	esi, Msg_OK
  3075 000084B8 E800DEFFFF          <1> 	call	print_msg
  3076 000084BD E9BDFEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3077                              <1> 
  3078                              <1> loc_mkdir_y_n_escape:
  3079 000084C2 B04E                <1> 	mov	al, 'N' ; 'no'
  3080 000084C4 EBBF                <1> 	jmp	short loc_do_not_make_directory
  3081                              <1> 
  3082                              <1> delete_directory:
  3083                              <1> 	; 15/10/2016
  3084                              <1> 	; 06/03/2016
  3085                              <1> 	; 01/03/2016
  3086                              <1> 	; 29/02/2016
  3087                              <1> 	; 28/02/2016
  3088                              <1> 	; 27/02/2016
  3089                              <1> 	; 26/02/2016 (TRDOS 386 =  TRDOS v2.0)
  3090                              <1> 	; 16/10/2010 (CMD_INTR.ASM, 'cmp_cmd_rmdir')
  3091                              <1> 	; 05/06/2010
  3092                              <1> 	;
  3093                              <1> get_rmdir_fchar:
  3094                              <1> 	; esi = directory name
  3095 000084C6 803E20              <1> 	cmp	byte [esi], 20h
  3096 000084C9 7701                <1>         ja	short loc_rmdir_parse_path_name
  3097                              <1> 
  3098                              <1> loc_rmdir_nodirname_retn:
  3099 000084CB C3                  <1> 	retn
  3100                              <1> 
  3101                              <1> loc_rmdir_parse_path_name:
  3102 000084CC BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  3103 000084D1 E8901C0000          <1> 	call	parse_path_name
  3104 000084D6 0F8271F5FFFF        <1> 	jc	loc_cmd_failed
  3105                              <1> 
  3106                              <1> loc_rmdir_check_dirname_exists:
  3107 000084DC BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  3108 000084E1 803E20              <1> 	cmp	byte [esi], 20h
  3109 000084E4 0F8663F5FFFF        <1> 	jna	loc_cmd_failed
  3110 000084EA 8935[084D0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3111                              <1> 
  3112                              <1> loc_rmdir_drv:
  3113 000084F0 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  3114 000084F6 8835[064B0100]      <1> 	mov	[RUN_CDRV], dh
  3115                              <1> 
  3116 000084FC 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  3117 00008502 38F2                <1> 	cmp	dl, dh
  3118 00008504 740B                <1> 	je	short loc_rmdir_change_directory
  3119                              <1> 
  3120 00008506 E8B2E6FFFF          <1> 	call	change_current_drive
  3121 0000850B 0F826EFEFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3122                              <1> 
  3123                              <1> loc_rmdir_change_directory:
  3124 00008511 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3125 00008518 7614                <1> 	jna	short loc_rmdir_find_directory
  3126                              <1> 
  3127 0000851A FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  3128 00008520 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  3129 00008525 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3130 00008527 E826160000          <1> 	call	change_current_directory
  3131 0000852C 7211                <1> 	jc	short loc_rmdir_check_error_code
  3132                              <1> 
  3133                              <1> ;loc_rmdir_change_prompt_dir_string:
  3134                              <1> 	;call	change_prompt_dir_string
  3135                              <1> 
  3136                              <1> loc_rmdir_find_directory:
  3137                              <1> 	;mov	esi, FindFile_Name
  3138 0000852E 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3139 00008534 66B81008            <1> 	mov	ax, 0810h ; Only directories
  3140 00008538 E812FAFFFF          <1> 	call	find_first_file
  3141 0000853D 730A                <1> 	jnc	short loc_rmdir_ambgfn_check
  3142                              <1> 
  3143                              <1> loc_rmdir_check_error_code:
  3144 0000853F 3C02                <1> 	cmp	al, 2
  3145 00008541 740B                <1> 	je	short loc_rmdir_directory_not_found
  3146 00008543 F9                  <1> 	stc
  3147 00008544 E936FEFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3148                              <1> 
  3149                              <1> loc_rmdir_ambgfn_check:
  3150 00008549 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3151 0000854C 740F                <1> 	jz	short loc_rmdir_directory_found
  3152                              <1> 
  3153                              <1> loc_rmdir_directory_not_found:
  3154 0000854E BE[E5010100]        <1> 	mov	esi, Msg_Dir_Not_Found
  3155 00008553 E865DDFFFF          <1> 	call	print_msg
  3156                              <1> 
  3157 00008558 E922FEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3158                              <1> 
  3159                              <1> loc_rmdir_directory_found:
  3160 0000855D 80E307              <1> 	and	bl, 07h ; Attributes
  3161 00008560 0F8523FEFFFF        <1> 	jnz	loc_permission_denied
  3162                              <1> 
  3163                              <1> loc_rmdir_save_lnel: ; 28/02/2016
  3164                              <1>        ;mov	bh, [LongName_EntryLength]
  3165 00008566 883D[124D0100]      <1> 	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  3166                              <1> 	; edi = Directory Entry Offset (DirBuff)
  3167                              <1> 	; esi = Directory Entry (FFF Structure)
  3168                              <1> 	;mov	[DelFile_DirEntryAddr], edi ; not required
  3169                              <1> 	;mov	ax, [edi+20] ; First Cluster High Word
  3170                              <1>         ;shl	eax, 16
  3171                              <1> 	;mov	ax, [edi+26] ; First Cluster Low Word
  3172                              <1> 	; ROOT Dir First Cluster = 0
  3173                              <1>         ;cmp	eax, 2
  3174                              <1> 	;jb	loc_update_direntry_1
  3175                              <1> 
  3176                              <1> pass_rmdir_fc_check:
  3177 0000856C 57                  <1> 	push	edi ; * (29/02/2016)
  3178                              <1> 
  3179 0000856D BE[7B030100]        <1> 	mov	esi, Msg_DoYouWantRmDir
  3180 00008572 E846DDFFFF          <1> 	call	print_msg
  3181 00008577 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3182 0000857D E83BDDFFFF          <1> 	call	print_msg
  3183 00008582 BE[67030100]        <1> 	mov	esi, Msg_YesNo
  3184 00008587 E831DDFFFF          <1> 	call	print_msg
  3185                              <1> 
  3186                              <1> loc_rmdir_ask_again:
  3187 0000858C 30E4                <1> 	xor	ah, ah
  3188 0000858E E88386FFFF          <1> 	call	int16h
  3189 00008593 3C1B                <1> 	cmp	al, 1Bh
  3190                              <1> 	;je	short loc_do_not_delete_directory
  3191 00008595 0F8498000000        <1>         je      loc_rmdir_y_n_escape ; 06/03/2016
  3192 0000859B 24DF                <1> 	and	al, 0DFh
  3193 0000859D A2[71030100]        <1> 	mov	[Y_N_nextline], al
  3194 000085A2 3C59                <1> 	cmp	al, 'Y'
  3195 000085A4 7404                <1> 	je	short loc_rmdir_yes_delete_directory
  3196 000085A6 3C4E                <1> 	cmp	al, 'N'
  3197 000085A8 75E2                <1> 	jne	short loc_rmdir_ask_again
  3198                              <1> 
  3199                              <1> loc_do_not_delete_directory:
  3200                              <1> loc_rmdir_yes_delete_directory:
  3201 000085AA A2[71030100]        <1> 	mov	[Y_N_nextline], al
  3202 000085AF 6650                <1> 	push	ax
  3203 000085B1 BE[71030100]        <1> 	mov	esi, Y_N_nextline
  3204 000085B6 E802DDFFFF          <1> 	call	print_msg
  3205 000085BB 6658                <1> 	pop	ax
  3206 000085BD 5F                  <1> 	pop	edi ; * (29/02/2016)
  3207                              <1> 	;cmp	al, 'Y' ; 'yes'
  3208                              <1> 	;cmc
  3209                              <1>         ;jnc	loc_file_rw_restore_retn
  3210 000085BE 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3211 000085C0 0F84B9FDFFFF        <1>         je	loc_file_rw_restore_retn  
  3212                              <1> 
  3213                              <1> loc_rmdir_delete_short_name_check_dir_empty:
  3214                              <1> 	; EDI = Directory buffer entry offset/address 
  3215 000085C6 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3216 000085CA C1E010              <1>         shl	eax, 16
  3217 000085CD 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3218                              <1> 
  3219 000085D1 A3[0C4D0100]        <1> 	mov 	[DelFile_FCluster], eax
  3220                              <1> 
  3221                              <1> 	;mov	bx, [DirBuff_EntryCounter]
  3222 000085D6 668B1D[C44C0100]    <1> 	mov	bx, [FindFile_DirEntryNumber] ; 27/02/2016
  3223 000085DD 66891D[104D0100]    <1> 	mov	[DelFile_EntryCounter], bx
  3224                              <1> 
  3225 000085E4 29DB                <1>     	sub	ebx, ebx
  3226 000085E6 8A3D[4A4C0100]      <1> 	mov	bh, [FindFile_Drv]
  3227 000085EC BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3228 000085F1 01DE                <1> 	add	esi, ebx
  3229                              <1> 
  3230 000085F3 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h
  3231 000085F9 743F                <1> 	je	short loc_rmdir_delete_fs_directory
  3232                              <1> 
  3233                              <1> 	;cmp	byte [esi+LD_FATType], 1
  3234                              <1> 	;jnb	short loc_rmdir_get__last_cluster_0
  3235                              <1> 	;mov	eax, 0Bh ; Invalid Format
  3236                              <1> 	;jmp	loc_file_rw_cmd_failed
  3237                              <1>   
  3238                              <1> ;loc_rmdir_get_last_cluster_0:
  3239 000085FB 8B15[D54A0100]      <1> 	mov	edx, [DirBuff_Cluster]
  3240 00008601 8915[3C4D0100]      <1> 	mov	[RmDir_ParentDirCluster], edx
  3241                              <1> 
  3242 00008607 893D[384D0100]      <1> 	mov	[RmDir_DirEntryOffset], edi
  3243                              <1> 
  3244                              <1> 	; 01/03/2016
  3245 0000860D C705[C64A0100]0000- <1> 	mov	dword [FAT_ClusterCounter], 0 ; Reset
  3245 00008615 0000                <1>
  3246                              <1> 
  3247                              <1> loc_rmdir_get_last_cluster:
  3248 00008617 E85C3A0000          <1> 	call	get_last_cluster
  3249 0000861C 0F82B8000000        <1>         jc      loc_rmdir_cmd_failed
  3250                              <1> 	
  3251 00008622 3B05[0C4D0100]      <1> 	cmp	eax, [DelFile_FCluster]
  3252 00008628 752F                <1> 	jne	short loc_rmdir_multi_dir_clusters
  3253                              <1> 
  3254 0000862A C605[374D0100]00    <1> 	mov	byte [RmDir_MultiClusters], 0
  3255 00008631 EB2D                <1> 	jmp	short pass_rmdir_multi_dir_clusters
  3256                              <1> 
  3257                              <1> loc_rmdir_y_n_escape:
  3258 00008633 B04E                <1> 	mov	al, 'N' ; 'no'
  3259 00008635 E970FFFFFF          <1>         jmp     loc_do_not_delete_directory
  3260                              <1> 
  3261                              <1> loc_rmdir_delete_fs_directory:
  3262 0000863A 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  3263 0000863E 0F8545FDFFFF        <1> 	jne	loc_permission_denied
  3264                              <1> 
  3265 00008644 E826140000          <1> 	call	delete_fs_directory
  3266 00008649 0F8326FDFFFF        <1> 	jnc	loc_print_deleted_message
  3267                              <1> 
  3268 0000864F 09C0                <1> 	or	eax, eax
  3269 00008651 745D                <1> 	jz	loc_rmdir_directory_not_empty_2         
  3270 00008653 F9                  <1> 	stc
  3271 00008654 E926FDFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3272                              <1>  
  3273                              <1> loc_rmdir_multi_dir_clusters:
  3274 00008659 C605[374D0100]01    <1> 	mov	byte [RmDir_MultiClusters], 1
  3275                              <1> 
  3276                              <1> pass_rmdir_multi_dir_clusters:
  3277 00008660 A3[404D0100]        <1> 	mov 	[RmDir_DirLastCluster], eax
  3278 00008665 890D[444D0100]      <1> 	mov	[RmDir_PreviousCluster], ecx
  3279                              <1> 
  3280                              <1> loc_rmdir_load_fat_sub_directory:
  3281 0000866B E8F3330000          <1> 	call	load_FAT_sub_directory
  3282 00008670 7268                <1> 	jc	loc_rmdir_cmd_failed
  3283                              <1> 
  3284                              <1> loc_rmdir_find_last_dir_entry:
  3285 00008672 56                  <1> 	push	esi
  3286 00008673 BE[2E4C0100]        <1> 	mov	esi, Dir_File_Name
  3287 00008678 C6062A              <1> 	mov	byte [esi], '*'
  3288 0000867B C646082A            <1> 	mov	byte [esi+8], '*'
  3289 0000867F 31DB                <1> 	xor	ebx, ebx ; Entry offset  = 0
  3290                              <1> loc_rmdir_find_last_dir_entry_next:
  3291 00008681 66B80008            <1> 	mov	ax, 0800h ; Except volume/long names
  3292 00008685 6631C9              <1> 	xor	cx, cx ; 0 = Find a valid file or dir name
  3293 00008688 E81B180000          <1> 	call	find_directory_entry
  3294 0000868D 7271                <1> 	jc	short loc_rmdir_empty_dir_cluster
  3295 0000868F 83FB01              <1> 	cmp	ebx, 1
  3296 00008692 771B                <1> 	ja	short loc_rmdir_directory_not_empty_1
  3297                              <1> loc_rmdir_dot_entry_check:
  3298 00008694 80FD2E              <1> 	cmp	ch, '.' ; The first char of the dir entry
  3299 00008697 7516                <1> 	jne	short loc_rmdir_directory_not_empty_1
  3300 00008699 08DB                <1> 	or	bl, bl
  3301 0000869B 7506                <1> 	jnz	short loc_rmdir_dotdot_entry_check
  3302 0000869D 807F0120            <1> 	cmp	byte [edi+1], 20h
  3303 000086A1 EB06                <1> 	jmp	short pass_rmdir_dot_entry_check
  3304                              <1> 
  3305                              <1> loc_rmdir_dotdot_entry_check:
  3306 000086A3 66817F012E20        <1> 	cmp	word [edi+1], '. '
  3307                              <1> pass_rmdir_dot_entry_check:	
  3308 000086A9 7504                <1> 	jne	short loc_rmdir_directory_not_empty_1 
  3309 000086AB FEC3                <1> 	inc	bl
  3310 000086AD EBD2                <1> 	jmp	short loc_rmdir_find_last_dir_entry_next 
  3311                              <1> 
  3312                              <1> 
  3313                              <1> loc_rmdir_directory_not_empty_1:
  3314 000086AF 58                  <1> 	pop	eax ; pushed esi 
  3315                              <1> 
  3316                              <1> loc_rmdir_directory_not_empty_2:
  3317 000086B0 BE[9C030100]        <1> 	mov	esi, Msg_Dir_Not_Empty
  3318 000086B5 E803DCFFFF          <1> 	call	print_msg
  3319                              <1> 	; 01/03/2016
  3320 000086BA A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  3321 000086BF 09C0                <1> 	or	eax, eax ; 0 ?
  3322 000086C1 0F84B8FCFFFF        <1> 	jz	loc_file_rw_restore_retn
  3323                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3324                              <1> 
  3325 000086C7 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> use ESI for Drive parameters
  3326                              <1> 	           ; BL = 1 -> add free clusters
  3327 000086CB E829380000          <1> 	call	calculate_fat_freespace
  3328 000086D0 09C9                <1> 	or	ecx, ecx
  3329 000086D2 0F84A7FCFFFF        <1>         jz      loc_file_rw_restore_retn ; ecx = 0 -> OK
  3330                              <1> 	; ecx > 0 -> Error (Recalculation is neeeded)
  3331 000086D8 EB0E                <1> 	jmp	short loc_rmdir_cmd_return
  3332                              <1> 
  3333                              <1> 
  3334                              <1> loc_rmdir_cmd_failed:
  3335 000086DA 833D[C64A0100]01    <1> 	cmp	dword [FAT_ClusterCounter], 1
  3336 000086E1 0F8298FCFFFF        <1> 	jb	loc_file_rw_cmd_failed	
  3337 000086E7 F9                  <1> 	stc
  3338                              <1> loc_rmdir_cmd_return:
  3339                              <1> 	; 01/03/2016
  3340 000086E8 9C                  <1> 	pushf
  3341                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3342 000086E9 66BB00FF            <1> 	mov	bx, 0FF00h ; BH = FFh -> use ESI for Drive parameters
  3343                              <1> 	           ; BL = 0 -> Recalculate free cluster count
  3344 000086ED 50                  <1> 	push	eax
  3345 000086EE E806380000          <1> 	call	calculate_fat_freespace	
  3346 000086F3 58                  <1> 	pop	eax
  3347 000086F4 9D                  <1> 	popf
  3348 000086F5 0F8284FCFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3349 000086FB E97FFCFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3350                              <1> 
  3351                              <1> 
  3352                              <1> loc_rmdir_empty_dir_cluster:
  3353 00008700 5E                  <1> 	pop	esi
  3354                              <1> 
  3355                              <1> loc_rmdir_set_prev_cluster_dir_last_cluster:
  3356 00008701 803D[374D0100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3357 00008708 761D                <1> 	jna	short loc_rmdir_unlink_dir_last_cluster
  3358                              <1> 
  3359 0000870A A1[444D0100]        <1> 	mov	eax, [RmDir_PreviousCluster]
  3360                              <1> 	;xor	ecx, ecx
  3361 0000870F 49                  <1> 	dec	ecx ; FFFFFFFFh
  3362 00008710 E892340000          <1> 	call	update_cluster
  3363 00008715 7310                <1> 	jnc	short loc_rmdir_unlink_dir_last_cluster
  3364                              <1> 
  3365                              <1> loc_rmdir_unlink_stc_retn:
  3366                              <1> 	; 01/03/2016
  3367 00008717 83F801              <1> 	cmp	eax, 1  ; eax = 0 -> end of cluster chain
  3368 0000871A F5                  <1> 	cmc 
  3369 0000871B 72BD                <1> 	jc	short loc_rmdir_cmd_failed
  3370 0000871D EB1D                <1> 	jmp	short loc_rmdir_save_fat_buffer 
  3371                              <1> 	
  3372                              <1> loc_rmdir_unlink_stc_retn_0Bh:
  3373 0000871F B81C000000          <1> 	mov	eax, 28 ; Invalid format ; 15/10/2016
  3374 00008724 F9                  <1> 	stc
  3375 00008725 EBB3                <1> 	jmp	short loc_rmdir_cmd_failed
  3376                              <1>  
  3377                              <1> loc_rmdir_unlink_dir_last_cluster:
  3378 00008727 A1[404D0100]        <1> 	mov	eax, [RmDir_DirLastCluster]
  3379 0000872C 31C9                <1> 	xor	ecx, ecx ; 0
  3380 0000872E E874340000          <1> 	call	update_cluster
  3381 00008733 73EA                <1> 	jnc	short loc_rmdir_unlink_stc_retn_0Bh
  3382                              <1> 	; Because of it is the last cluster
  3383                              <1> 	; 'update_cluster' must return with eocc error 
  3384 00008735 09C0                <1> 	or	eax, eax
  3385 00008737 7403                <1> 	jz	short loc_rmdir_save_fat_buffer ; eocc	
  3386 00008739 F9                  <1> 	stc
  3387 0000873A EB9E                <1>         jmp     short loc_rmdir_cmd_failed
  3388                              <1> 	 
  3389                              <1> loc_rmdir_save_fat_buffer:
  3390 0000873C 803D[BE4A0100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  3391 00008743 7525                <1> 	jne	short loc_rmdir_calculate_FAT_freespace
  3392 00008745 E81A370000          <1> 	call	save_fat_buffer
  3393 0000874A 728E                <1> 	jc	short loc_rmdir_cmd_failed
  3394                              <1> 
  3395                              <1> 	; 01/03/2016
  3396 0000874C 803D[374D0100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3397 00008753 7615                <1> 	jna	short loc_rmdir_calculate_FAT_freespace
  3398                              <1> 
  3399 00008755 A1[0C4D0100]        <1> 	mov	eax, [DelFile_FCluster]
  3400 0000875A E9B8FEFFFF          <1>         jmp     loc_rmdir_get_last_cluster
  3401                              <1> 
  3402                              <1> loc_rmdir_delete_short_name_invalid_data:
  3403 0000875F B81D000000          <1> 	mov	eax, 29 ; Invalid data (15/10/2016)
  3404 00008764 F9                  <1> 	stc
  3405 00008765 E970FFFFFF          <1>         jmp     loc_rmdir_cmd_failed
  3406                              <1> 
  3407                              <1> loc_rmdir_calculate_FAT_freespace:
  3408 0000876A A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  3409 0000876F 66BB01FF            <1> 	mov	bx, 0FF01h
  3410                              <1> 	; BL = 1 -> Add EAX to free space count
  3411                              <1> 	; BH = FFh ->
  3412                              <1> 	; ESI = Logical DOS Drive Description Table address
  3413 00008773 E881370000          <1> 	call	calculate_fat_freespace
  3414                              <1> 
  3415 00008778 21C9                <1> 	and	ecx, ecx ; ecx = 0 -> valid free sector count
  3416 0000877A 7409                <1> 	jz 	short loc_rmdir_delete_short_name_continue
  3417                              <1> 
  3418                              <1> loc_rmdir_recalculate_FAT_freespace:
  3419 0000877C 66BB00FF            <1>         mov     bx, 0FF00h ; BL = 0 -> Recalculate free space
  3420 00008780 E874370000          <1> 	call	calculate_fat_freespace
  3421                              <1> 	          
  3422                              <1> loc_rmdir_delete_short_name_continue:
  3423 00008785 A1[3C4D0100]        <1> 	mov	eax, [RmDir_ParentDirCluster]
  3424 0000878A 83F802              <1> 	cmp	eax, 2
  3425 0000878D 730D                <1> 	jnb	short loc_rmdir_del_short_name_load_sub_dir
  3426 0000878F E844320000          <1> 	call	load_FAT_root_directory
  3427 00008794 0F82E5FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3428 0000879A EB0B                <1> 	jmp	short loc_rmdir_del_short_name_ld_chk_fclust
  3429                              <1> 
  3430                              <1> loc_rmdir_del_short_name_load_sub_dir:	
  3431 0000879C E8C2320000          <1> 	call	load_FAT_sub_directory
  3432 000087A1 0F82D8FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3433                              <1> 
  3434                              <1> loc_rmdir_del_short_name_ld_chk_fclust:
  3435 000087A7 0FB73D[384D0100]    <1> 	movzx	edi, word [RmDir_DirEntryOffset]
  3436 000087AE 81C700000800        <1> 	add	edi, Directory_Buffer
  3437                              <1> 
  3438 000087B4 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3439 000087B8 C1E010              <1> 	shl	eax, 16
  3440 000087BB 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3441                              <1>         ; Not necessary... 
  3442 000087BF 3B05[0C4D0100]      <1> 	cmp	eax, [DelFile_FCluster]
  3443 000087C5 7598                <1> 	jne	short loc_rmdir_delete_short_name_invalid_data
  3444                              <1> 	;
  3445 000087C7 C607E5              <1> 	mov	byte [edi], 0E5h ; 'Deleted' sign
  3446                              <1> 	; 27/02/2016
  3447                              <1> 	; TRDOS v1 has a bug here! it does not set
  3448                              <1> 	; 'DirBuff_ValidData' to 2; as result of this bug,
  3449                              <1> 	; 'save_directory_buffer' would not save the change ! 
  3450 000087CA C605[D04A0100]02    <1>   	mov	byte [DirBuff_ValidData], 2 ; change sign
  3451                              <1> 	;
  3452 000087D1 E8F41D0000          <1> 	call	save_directory_buffer
  3453 000087D6 0F82A3FBFFFF        <1> 	jc	loc_file_rw_cmd_failed 
  3454                              <1> 
  3455                              <1> loc_rmdir_del_long_name:
  3456 000087DC 0FB615[124D0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  3457 000087E3 08D2                <1> 	or	dl, dl
  3458 000087E5 7414                <1> 	jz	short loc_rmdir_update_parent_dir_lmdt
  3459                              <1>              
  3460 000087E7 0FB705[104D0100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  3461 000087EE 29D0                <1> 	sub	eax, edx
  3462 000087F0 0F8289FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3463                              <1>  
  3464                              <1>  	; EAX = Directory Entry Number of the long name last entry
  3465 000087F6 E82F1F0000          <1> 	call	delete_longname
  3466                              <1> 	;jc	short loc_file_rw_cmd_failed
  3467                              <1> 
  3468                              <1> loc_rmdir_update_parent_dir_lmdt:
  3469 000087FB E8651E0000          <1> 	call	update_parent_dir_lmdt
  3470                              <1> 	;jc	short loc_file_rw_cmd_failed
  3471                              <1> 
  3472                              <1> loc_rmdir_ok:
  3473 00008800 BE[75030100]        <1> 	mov	esi, Msg_OK
  3474 00008805 E8B3DAFFFF          <1> 	call	print_msg
  3475 0000880A E970FBFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3476                              <1> 
  3477                              <1> 
  3478                              <1> delete_file:
  3479                              <1> 	; 29/02/2016
  3480                              <1> 	; 28/02/2016 (TRDOS 386 =  TRDOS v2.0)
  3481                              <1> 	; 09/08/2010 (CMD_INTR.ASM, 'cmp_cmd_del')
  3482                              <1> 	; 28/02/2010
  3483                              <1> 
  3484                              <1> get_delfile_fchar:
  3485                              <1> 	; esi = file name
  3486 0000880F 803E20              <1> 	cmp	byte [esi], 20h
  3487 00008812 7701                <1>         ja	short loc_delfile_parse_path_name
  3488                              <1> 
  3489                              <1> loc_delfile_nofilename_retn:
  3490 00008814 C3                  <1> 	retn
  3491                              <1> 
  3492                              <1> loc_delfile_parse_path_name:
  3493 00008815 BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  3494 0000881A E847190000          <1> 	call	parse_path_name
  3495 0000881F 0F8228F2FFFF        <1> 	jc	loc_cmd_failed
  3496                              <1> 
  3497                              <1> loc_delfile_check_filename_exists:
  3498 00008825 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  3499 0000882A 803E20              <1> 	cmp	byte [esi], 20h
  3500 0000882D 0F861AF2FFFF        <1> 	jna	loc_cmd_failed
  3501 00008833 8935[084D0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3502                              <1> 
  3503                              <1> loc_delfile_drv:
  3504 00008839 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  3505 0000883F 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  3506 00008845 8835[064B0100]      <1> 	mov	[RUN_CDRV], dh
  3507 0000884B 38F2                <1> 	cmp	dl, dh
  3508 0000884D 740B                <1> 	je	short loc_delfile_change_directory
  3509                              <1> 
  3510 0000884F E869E3FFFF          <1> 	call	change_current_drive
  3511 00008854 0F8225FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3512                              <1> 
  3513                              <1> loc_delfile_change_directory:
  3514 0000885A 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3515 00008861 7618                <1> 	jna	short loc_delfile_find
  3516                              <1> 
  3517 00008863 FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  3518 00008869 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  3519 0000886E 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3520 00008870 E8DD120000          <1> 	call	change_current_directory
  3521 00008875 0F8204FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3522                              <1> 
  3523                              <1> ;loc_delfile_change_prompt_dir_string:
  3524                              <1> 	;call	change_prompt_dir_string
  3525                              <1> 
  3526                              <1> loc_delfile_find:
  3527                              <1> 	;mov	esi, FindFile_Name
  3528 0000887B 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3529 00008881 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3530 00008885 E8C5F6FFFF          <1> 	call	find_first_file
  3531 0000888A 0F82EFFAFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3532                              <1> 
  3533                              <1> loc_delfile_ambgfn_check:
  3534 00008890 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3535 00008893 740B                <1> 	jz	short loc_delfile_found
  3536                              <1> 
  3537                              <1> loc_file_not_found:
  3538 00008895 B802000000          <1> 	mov	eax, 2 ; File not found sign
  3539 0000889A F9                  <1> 	stc
  3540 0000889B E9DFFAFFFF          <1> 	jmp	loc_file_rw_cmd_failed   
  3541                              <1> 
  3542                              <1> loc_delfile_found:
  3543 000088A0 80E307              <1> 	and	bl, 07h ; Attributes
  3544 000088A3 0F85E0FAFFFF        <1>         jnz     loc_permission_denied
  3545                              <1> 
  3546                              <1> ;loc_delfile_found_save_lnel:
  3547                              <1> ;	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  3548                              <1> 
  3549                              <1> loc_delfile_ask_for_delete:
  3550 000088A9 57                  <1> 	push	edi ; * (29/02/2016)
  3551                              <1> 
  3552 000088AA BE[B3030100]        <1> 	mov	esi, Msg_DoYouWantDelete
  3553 000088AF E809DAFFFF          <1> 	call	print_msg
  3554 000088B4 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3555 000088BA E8FED9FFFF          <1> 	call	print_msg
  3556 000088BF BE[67030100]        <1> 	mov	esi, Msg_YesNo
  3557 000088C4 E8F4D9FFFF          <1> 	call	print_msg
  3558                              <1> 
  3559                              <1> loc_delfile_ask_again:
  3560 000088C9 30E4                <1> 	xor	ah, ah
  3561 000088CB E84683FFFF          <1> 	call	int16h
  3562 000088D0 3C1B                <1> 	cmp	al, 1Bh
  3563                              <1> 	;je	short loc_do_not_delete_file
  3564 000088D2 7457                <1> 	je	short loc_delfile_y_n_escape ; 06/03/2016
  3565 000088D4 24DF                <1> 	and	al, 0DFh
  3566 000088D6 A2[71030100]        <1> 	mov	[Y_N_nextline], al
  3567 000088DB 3C59                <1> 	cmp	al, 'Y'
  3568 000088DD 7404                <1> 	je	short loc_yes_delete_file
  3569 000088DF 3C4E                <1> 	cmp	al, 'N'
  3570 000088E1 75E6                <1> 	jne	short loc_delfile_ask_again
  3571                              <1> 
  3572                              <1> loc_do_not_delete_file:
  3573                              <1> loc_yes_delete_file:
  3574 000088E3 A2[71030100]        <1> 	mov	[Y_N_nextline], al
  3575 000088E8 6650                <1> 	push	ax
  3576 000088EA BE[71030100]        <1> 	mov	esi, Y_N_nextline
  3577 000088EF E8C9D9FFFF          <1> 	call	print_msg
  3578 000088F4 6658                <1> 	pop	ax
  3579 000088F6 5F                  <1> 	pop	edi ; * (29/02/2016)
  3580                              <1> 	;cmp	al, 'Y' ; 'yes'
  3581                              <1> 	;cmc
  3582                              <1>         ;jnc	loc_file_rw_restore_retn
  3583 000088F7 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3584 000088F9 0F8480FAFFFF        <1>         je	loc_file_rw_restore_retn  
  3585                              <1> 
  3586                              <1> loc_delete_file:
  3587 000088FF 8A3D[4A4C0100]      <1> 	mov	bh, [FindFile_Drv]
  3588                              <1> 	;mov	bl, [DelFile_LNEL]
  3589 00008905 8A1D[994C0100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  3590                              <1> 	;mov	cx, [DirBuff_EntryCounter]
  3591 0000890B 668B0D[C44C0100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  3592                              <1> 	; (*) EDI = Directory buffer entry offset/address 
  3593 00008912 E8FD1F0000          <1> 	call	remove_file ; (FILE.ASM, 'proc_delete_file')
  3594 00008917 0F8358FAFFFF        <1> 	jnc	loc_print_deleted_message
  3595                              <1> 
  3596 0000891D 3C05                <1> 	cmp	al, 05h
  3597 0000891F 0F8464FAFFFF        <1> 	je	loc_permission_denied
  3598 00008925 F9                  <1> 	stc
  3599 00008926 E954FAFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3600                              <1> 
  3601                              <1> loc_delfile_y_n_escape:
  3602 0000892B B04E                <1> 	mov	al, 'N' ; 'no'
  3603 0000892D EBB4                <1> 	jmp	short loc_do_not_delete_file
  3604                              <1> 
  3605                              <1> set_file_attributes:
  3606                              <1> 	; 06/03/2016
  3607                              <1> 	; 04/03/2016 (TRDOS 386 =  TRDOS v2.0)
  3608                              <1> 	; 10/07/2010 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_attrib')
  3609                              <1> 	; 23/05/2010 
  3610                              <1> 	; 17/12/2000 (P2000.ASM)
  3611                              <1> 
  3612                              <1> 	; esi = file or directory name
  3613 0000892F 6631C0              <1> 	xor	ax, ax
  3614 00008932 66A3[04040100]      <1> 	mov	[Attr_Chars], ax
  3615 00008938 A2[604D0100]        <1> 	mov	[Attributes], al
  3616                              <1> 
  3617                              <1> get_attrib_fchar:
  3618                              <1> 	; esi = file name
  3619 0000893D 8A06                <1> 	mov	al, [esi]
  3620 0000893F 3C20                <1> 	cmp	al, 20h
  3621 00008941 7623                <1> 	jna	short loc_attr_file_nofilename_retn
  3622                              <1> 
  3623                              <1> loc_scan_attrib_params:
  3624 00008943 3C2D                <1> 	cmp	al, '-'
  3625 00008945 0F871C010000        <1> 	ja	loc_attr_file_parse_path_name
  3626 0000894B 7408                <1> 	je	short loc_attr_space
  3627                              <1> 
  3628 0000894D 3C2B                <1> 	cmp	al, '+'
  3629 0000894F 0F85F8F0FFFF        <1> 	jne	loc_cmd_failed
  3630                              <1> 
  3631                              <1> loc_attr_space:
  3632 00008955 8A6601              <1> 	mov	ah, [esi+1]
  3633 00008958 80FC20              <1>  	cmp	ah, 20h
  3634 0000895B 770A                <1> 	ja	short pass_attr_space
  3635 0000895D 0F82EAF0FFFF        <1> 	jb	loc_cmd_failed
  3636 00008963 46                  <1> 	inc	esi
  3637 00008964 EBEF                <1> 	jmp	short loc_attr_space
  3638                              <1> 
  3639                              <1> loc_attr_file_nofilename_retn:
  3640 00008966 C3                  <1> 	retn
  3641                              <1> 
  3642                              <1> pass_attr_space:
  3643 00008967 80E4DF              <1> 	and	ah, 0DFh
  3644 0000896A 80FC53              <1> 	cmp	ah, 'S'
  3645 0000896D 0F87DAF0FFFF        <1> 	ja	loc_cmd_failed
  3646 00008973 7204                <1> 	jb	short pass_attr_system
  3647 00008975 B404                <1> 	mov	ah, 04h   ; System
  3648 00008977 EB21                <1> 	jmp	short pass_attr_archive
  3649                              <1> 
  3650                              <1> pass_attr_system:
  3651 00008979 80FC48              <1> 	cmp	ah, 'H'
  3652 0000897C 7706                <1> 	ja	short pass_attr_hidden
  3653 0000897E 7213                <1> 	jb	short pass_attr_read_only
  3654 00008980 B402                <1> 	mov	ah, 02h    ; Hidden
  3655 00008982 EB16                <1> 	jmp	short pass_attr_archive
  3656                              <1> 
  3657                              <1> pass_attr_hidden:
  3658 00008984 80FC52              <1> 	cmp	ah, 'R'
  3659 00008987 0F87C0F0FFFF        <1> 	ja	loc_cmd_failed
  3660 0000898D 7204                <1> 	jb	short pass_attr_read_only ; Read only
  3661 0000898F B401                <1> 	mov	ah, 01h
  3662 00008991 EB07                <1> 	jmp	short pass_attr_archive
  3663                              <1> 
  3664                              <1> pass_attr_read_only:
  3665 00008993 80FC41              <1> 	cmp	ah, 'A'
  3666 00008996 753B                <1> 	jne	short loc_chk_attr_enter
  3667 00008998 B420                <1> 	mov	ah, 20h    ; Archive
  3668                              <1> 
  3669                              <1> pass_attr_archive:
  3670 0000899A 3C2D                <1> 	cmp	al, '-'
  3671 0000899C 7508                <1> 	jne	short pass_reducing_attributes
  3672 0000899E 0825[04040100]      <1> 	or	[Attr_Chars], ah
  3673 000089A4 EB06                <1> 	jmp	short loc_change_attributes_inc
  3674                              <1> 
  3675                              <1> pass_reducing_attributes:
  3676 000089A6 0825[05040100]      <1> 	or	[Attr_Chars+1], ah
  3677                              <1> 
  3678                              <1> loc_change_attributes_inc:
  3679 000089AC 46                  <1> 	inc	esi
  3680 000089AD 8A6601              <1> 	mov	ah, [esi+1]
  3681 000089B0 80FC20              <1> 	cmp	ah, 20h
  3682 000089B3 7227                <1> 	jb	short pass_change_attr
  3683 000089B5 74F5                <1> 	je	short loc_change_attributes_inc
  3684 000089B7 80FC2D              <1> 	cmp	ah, '-'
  3685 000089BA 770D                <1> 	ja	short loc_chk_next_attr_char1
  3686 000089BC 7405                <1> 	je	short loc_chk_next_attr_char0
  3687 000089BE 80FC2B              <1> 	cmp	ah, '+'
  3688 000089C1 7506                <1> 	jne	short loc_chk_next_attr_char1
  3689                              <1> 
  3690                              <1> loc_chk_next_attr_char0:
  3691 000089C3 46                  <1> 	inc	esi
  3692 000089C4 668B06              <1> 	mov	ax, [esi]
  3693 000089C7 EB9E                <1> 	jmp	short pass_attr_space
  3694                              <1> 
  3695                              <1> loc_chk_next_attr_char1:
  3696 000089C9 803E2D              <1> 	cmp	byte [esi], '-'
  3697 000089CC 7799                <1> 	ja	short pass_attr_space
  3698 000089CE E988000000          <1>         jmp     loc_attr_file_check_fname_fchar
  3699                              <1> 
  3700                              <1> loc_chk_attr_enter:
  3701 000089D3 80FC0D              <1> 	cmp	ah, 0Dh
  3702 000089D6 0F8571F0FFFF        <1> 	jne	loc_cmd_failed
  3703                              <1> 
  3704                              <1> pass_change_attr:
  3705 000089DC A0[04040100]        <1> 	mov	al, [Attr_Chars]
  3706 000089E1 F6D0                <1> 	not	al
  3707 000089E3 2005[604D0100]      <1> 	and	[Attributes], al
  3708 000089E9 A0[05040100]        <1> 	mov	al, [Attr_Chars+1]
  3709 000089EE 0805[604D0100]      <1> 	or	[Attributes], al
  3710                              <1> 
  3711                              <1> loc_show_attributes:
  3712 000089F4 BE[4F0B0100]        <1> 	mov	esi, nextline
  3713 000089F9 E8BFD8FFFF          <1> 	call	print_msg
  3714                              <1> 
  3715                              <1> loc_show_attributes_no_nextline:
  3716 000089FE C705[04040100]4E4F- <1> 	mov	dword [Attr_Chars], 'NORM'
  3716 00008A06 524D                <1>
  3717 00008A08 66C705[08040100]41- <1> 	mov	word [Attr_Chars+4], 'AL'
  3717 00008A10 4C                  <1>
  3718 00008A11 BE[04040100]        <1> 	mov	esi, Attr_Chars
  3719 00008A16 A0[604D0100]        <1> 	mov	al, [Attributes]
  3720 00008A1B A804                <1> 	test	al, 04h
  3721 00008A1D 7406                <1> 	jz	short pass_put_attr_s
  3722 00008A1F 66C7065300          <1> 	mov	word [esi], 0053h     ; S
  3723 00008A24 46                  <1> 	inc	esi
  3724                              <1> 
  3725                              <1> pass_put_attr_s:
  3726 00008A25 A802                <1> 	test	al, 02h
  3727 00008A27 7406                <1> 	jz	short pass_put_attr_h
  3728 00008A29 66C7064800          <1> 	mov	word [esi], 0048h     ; H
  3729 00008A2E 46                  <1> 	inc	esi
  3730                              <1> 
  3731                              <1> pass_put_attr_h:
  3732 00008A2F A801                <1> 	test	al, 01h
  3733 00008A31 7406                <1> 	jz	short pass_put_attr_r
  3734 00008A33 66C7065200          <1> 	mov	word [esi], 0052h     ; R
  3735 00008A38 46                  <1> 	inc	esi
  3736                              <1> 
  3737                              <1> pass_put_attr_r:
  3738 00008A39 3C20                <1> 	cmp	al, 20h
  3739 00008A3B 7205                <1> 	jb	short pass_put_attr_a
  3740 00008A3D 66C7064100          <1> 	mov	word [esi], 0041h     ; A
  3741                              <1> 
  3742                              <1> pass_put_attr_a:
  3743 00008A42 BE[F7030100]        <1> 	mov	esi, Str_Attributes
  3744 00008A47 E871D8FFFF          <1> 	call	print_msg
  3745 00008A4C BE[4F0B0100]        <1> 	mov	esi, nextline
  3746 00008A51 E867D8FFFF          <1> 	call	print_msg
  3747 00008A56 E924F9FFFF          <1> 	jmp	loc_file_rw_restore_retn 
  3748                              <1> 
  3749                              <1> loc_attr_file_check_fname_fchar:
  3750 00008A5B 46                  <1> 	inc	esi
  3751 00008A5C 803E20              <1> 	cmp	byte [esi], 20h
  3752 00008A5F 74FA                <1> 	je	short loc_attr_file_check_fname_fchar
  3753 00008A61 0F8275FFFFFF        <1>         jb      pass_change_attr
  3754                              <1> 		   
  3755                              <1> loc_attr_file_parse_path_name:
  3756 00008A67 BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  3757 00008A6C E8F5160000          <1> 	call	parse_path_name
  3758 00008A71 0F82D6EFFFFF        <1> 	jc	loc_cmd_failed
  3759                              <1> 
  3760                              <1> loc_attr_file_check_filename_exists:
  3761 00008A77 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  3762 00008A7C 803E20              <1> 	cmp	byte [esi], 20h
  3763 00008A7F 0F86C8EFFFFF        <1> 	jna	loc_cmd_failed
  3764 00008A85 8935[084D0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3765                              <1> 
  3766                              <1> loc_attr_file_drv:
  3767 00008A8B 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  3768 00008A91 8835[064B0100]      <1> 	mov	[RUN_CDRV], dh
  3769                              <1> 
  3770 00008A97 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  3771 00008A9D 38F2                <1> 	cmp	dl, dh
  3772 00008A9F 740B                <1> 	je	short loc_attr_file_change_directory
  3773                              <1> 
  3774 00008AA1 E817E1FFFF          <1> 	call	change_current_drive
  3775 00008AA6 0F82D3F8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3776                              <1> 
  3777                              <1> loc_attr_file_change_directory:
  3778 00008AAC 803D[4B4C0100]20    <1>         cmp     byte [FindFile_Directory], 20h
  3779 00008AB3 7618                <1> 	jna	short loc_attr_file_find
  3780                              <1> 
  3781 00008AB5 FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  3782                              <1> 	
  3783 00008ABB BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  3784 00008AC0 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3785 00008AC2 E88B100000          <1> 	call	change_current_directory
  3786 00008AC7 0F82B2F8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3787                              <1> 
  3788                              <1> ;loc_attr_file_change_prompt_dir_string:
  3789                              <1> 	;call	change_prompt_dir_string
  3790                              <1> 
  3791                              <1> loc_attr_file_find:
  3792                              <1> 	;mov	esi, FindFile_Name
  3793 00008ACD 8B35[084D0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3794 00008AD3 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  3795 00008AD7 E873F4FFFF          <1> 	call	find_first_file
  3796 00008ADC 0F829DF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3797                              <1> 
  3798                              <1> loc_attr_file_ambgfn_check:
  3799 00008AE2 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3800                              <1> 	;	(Note: It was BX in TRDOS v1)
  3801                              <1> 	;jz	short loc_attr_file_found
  3802 00008AE5 0F85AAFDFFFF        <1>         jnz     loc_file_not_found ; 06/03/2016 
  3803                              <1> 
  3804                              <1> 	;mov	eax, 2 ; File not found sign
  3805                              <1> 	;stc
  3806                              <1> 	;jmp	loc_file_rw_cmd_failed   
  3807                              <1> 
  3808                              <1> loc_attr_file_found:
  3809                              <1> 	; EDI = Directory buffer entry offset/address
  3810                              <1> 	; BL = File (or Directory) Attributes 
  3811                              <1> 	;	(Note: It was 'CL' in TRDOS v1)
  3812                              <1> 	; mov	bl, [EDI+0Bh]
  3813                              <1> 	
  3814 00008AEB 66833D[04040100]00  <1> 	cmp	word [Attr_Chars], 0
  3815 00008AF3 770B                <1> 	ja	short loc_attr_file_change_attributes
  3816 00008AF5 881D[604D0100]      <1> 	mov	[Attributes], bl
  3817 00008AFB E9F4FEFFFF          <1> 	jmp	loc_show_attributes
  3818                              <1> 
  3819                              <1> loc_attr_file_change_attributes:
  3820 00008B00 A0[04040100]        <1> 	mov	al, [Attr_Chars]
  3821 00008B05 F6D0                <1> 	not	al
  3822 00008B07 20C3                <1> 	and	bl, al
  3823 00008B09 A0[05040100]        <1> 	mov	al, [Attr_Chars+1]
  3824 00008B0E 08C3                <1> 	or	bl, al
  3825                              <1> 
  3826 00008B10 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
  3827 00008B16 741D                <1> 	je	short loc_attr_file_fs_check
  3828                              <1> 
  3829 00008B18 881D[604D0100]      <1> 	mov	[Attributes], bl
  3830 00008B1E 885F0B              <1> 	mov	[edi+0Bh], bl    ; Attributes (New!)
  3831                              <1> 
  3832                              <1> 	; 04/03/2016
  3833                              <1> 	; TRDOS v1 has a bug here! it does not set
  3834                              <1> 	; 'DirBuff_ValidData' to 2; as result of this bug,
  3835                              <1> 	; 'save_directory_buffer' would not save the new attributes ! 
  3836                              <1> 	
  3837 00008B21 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  3838                              <1> 
  3839 00008B28 E89D1A0000          <1> 	call 	save_directory_buffer
  3840 00008B2D 0F824CF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3841                              <1> 
  3842 00008B33 EB33                <1> 	jmp	short loc_print_attr_changed_message
  3843                              <1> 
  3844                              <1> loc_attr_file_fs_check:
  3845 00008B35 29C0                <1> 	sub	eax, eax
  3846 00008B37 8A25[CE4A0100]      <1>         mov     ah, [DirBuff_DRV]
  3847 00008B3D BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3848 00008B42 01C6                <1>         add     esi, eax
  3849 00008B44 807E04A1            <1>         cmp     byte [esi+LD_FSType], 0A1h
  3850 00008B48 7309                <1> 	jnc	short loc_attr_file_change_fs_file_attributes
  3851 00008B4A 66B80D00            <1> 	mov	ax, 0Dh ; Invalid Data
  3852 00008B4E E92CF8FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3853                              <1> 
  3854                              <1> loc_attr_file_change_fs_file_attributes:
  3855                              <1> 	; BL = New MS-DOS File Attributes
  3856 00008B53 88D8                <1> 	mov	al, bl ; File/Directory Attributes
  3857 00008B55 30E4                <1> 	xor	ah, ah ; Attributes in MS-DOS format sign	  
  3858 00008B57 E8A7050000          <1> 	call	change_fs_file_attributes
  3859 00008B5C 0F821DF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3860                              <1> 
  3861 00008B62 881D[604D0100]      <1> 	mov	[Attributes], bl 
  3862                              <1> 
  3863                              <1> loc_print_attr_changed_message:
  3864 00008B68 BE[F2030100]        <1> 	mov	esi, Msg_New
  3865 00008B6D E84BD7FFFF          <1> 	call	print_msg
  3866 00008B72 E987FEFFFF          <1> 	jmp	loc_show_attributes_no_nextline
  3867                              <1> 
  3868                              <1> rename_file:
  3869                              <1> 	; 06/11/2016
  3870                              <1> 	; 05/11/2016
  3871                              <1> 	; 16/10/2016
  3872                              <1> 	; 08/03/2016
  3873                              <1> 	; 06/03/2016 (TRDOS 386 =  TRDOS v2.0)
  3874                              <1> 	; 20/11/2010 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_rename')
  3875                              <1> 	; 16/11/2010 
  3876                              <1> 
  3877                              <1> get_rename_source_fchar:
  3878                              <1> 	; esi = file name
  3879 00008B77 803E20              <1> 	cmp	byte [esi], 20h
  3880 00008B7A 7614                <1>         jna	short loc_rename_nofilename_retn
  3881                              <1> 
  3882 00008B7C 8935[884D0100]      <1> 	mov	[SourceFilePath], esi
  3883                              <1> 
  3884                              <1> rename_scan_source_file:
  3885 00008B82 46                  <1> 	inc	esi
  3886 00008B83 803E20              <1> 	cmp	byte [esi], 20h
  3887 00008B86 7409                <1> 	je	short rename_scan_destination_file_1
  3888                              <1> 	;jb	short loc_rename_nofilename_retn
  3889 00008B88 0F82BFEEFFFF        <1> 	jb	loc_cmd_failed
  3890 00008B8E EBF2                <1> 	jmp	short rename_scan_source_file
  3891                              <1> 
  3892                              <1> loc_rename_nofilename_retn: ; 08/03/2016
  3893 00008B90 C3                  <1> 	retn
  3894                              <1> 
  3895                              <1> rename_scan_destination_file_1:
  3896 00008B91 C60600              <1> 	mov	byte [esi], 0
  3897                              <1> 
  3898                              <1> rename_scan_destination_file_2:
  3899 00008B94 46                  <1> 	inc	esi  
  3900 00008B95 803E20              <1> 	cmp	byte [esi], 20h
  3901 00008B98 74FA                <1> 	je	short rename_scan_destination_file_2
  3902                              <1> 	;jb	short loc_rename_nofilename_retn
  3903 00008B9A 0F82ADEEFFFF        <1> 	jb	loc_cmd_failed
  3904                              <1> 
  3905 00008BA0 8935[8C4D0100]      <1> 	mov	[DestinationFilePath], esi
  3906                              <1> 
  3907                              <1> rename_scan_destination_file_3:
  3908 00008BA6 46                  <1> 	inc	esi  
  3909 00008BA7 803E20              <1> 	cmp	byte [esi], 20h
  3910 00008BAA 77FA                <1> 	ja	short rename_scan_destination_file_3
  3911                              <1> 
  3912 00008BAC C60600              <1> 	mov	byte [esi], 0
  3913                              <1> 
  3914                              <1> loc_rename_save_current_drive:
  3915 00008BAF 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  3916 00008BB5 8835[064B0100]      <1> 	mov	byte [RUN_CDRV], dh
  3917                              <1> 
  3918                              <1> loc_rename_sf_parse_path_name:
  3919 00008BBB 8B35[884D0100]      <1> 	mov	esi, [SourceFilePath] 
  3920 00008BC1 BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  3921 00008BC6 E89B150000          <1> 	call	parse_path_name
  3922 00008BCB 0F827CEEFFFF        <1> 	jc	loc_cmd_failed
  3923                              <1> 
  3924                              <1> loc_rename_sf_check_filename_exists:
  3925 00008BD1 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  3926 00008BD6 803E20              <1> 	cmp	byte [esi], 20h
  3927 00008BD9 0F866EEEFFFF        <1> 	jna	loc_cmd_failed
  3928                              <1> 
  3929                              <1> 	;mov	[DelFile_FNPointer], esi 
  3930                              <1> 
  3931                              <1> loc_rename_sf_drv:
  3932                              <1> 	;mov	dh, [Current_Drv]
  3933                              <1> 	;mov	[RUN_CDRV], dh
  3934                              <1> 
  3935 00008BDF 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  3936 00008BE5 38F2                <1> 	cmp	dl, dh ; dh = [Current_Drv]
  3937 00008BE7 740B                <1> 	je	short rename_sf_change_directory
  3938                              <1> 
  3939 00008BE9 E8CFDFFFFF          <1> 	call	change_current_drive
  3940 00008BEE 0F828BF7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3941                              <1> 
  3942                              <1> rename_sf_change_directory:
  3943 00008BF4 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3944 00008BFB 7618                <1> 	jna	short rename_sf_find
  3945                              <1> 
  3946 00008BFD FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  3947 00008C03 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  3948 00008C08 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3949 00008C0A E8430F0000          <1> 	call	change_current_directory
  3950 00008C0F 0F826AF7FFFF        <1>  	jc	loc_file_rw_cmd_failed
  3951                              <1> 
  3952                              <1> ;rename_sf_change_prompt_dir_string:
  3953                              <1> 	;call	change_prompt_dir_string
  3954                              <1> 
  3955                              <1> rename_sf_find:
  3956                              <1> 	;mov	esi, [DelFile_FNPointer]
  3957 00008C15 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  3958                              <1> 
  3959 00008C1A 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  3960 00008C1E E82CF3FFFF          <1> 	call	find_first_file
  3961 00008C23 0F8256F7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3962                              <1> 
  3963                              <1> loc_rename_sf_ambgfn_check:
  3964 00008C29 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3965                              <1> 	;	(Note: It was BX in TRDOS v1)
  3966                              <1> 	;jz	short loc_rename_sf_found
  3967 00008C2C 0F8563FCFFFF        <1> 	jnz	loc_file_not_found
  3968                              <1> 
  3969                              <1> 	;mov	eax, 2 ; File not found sign
  3970                              <1> 	;stc
  3971                              <1> 	;jmp	loc_file_rw_cmd_failed   
  3972                              <1> 
  3973                              <1> loc_rename_sf_found:
  3974                              <1> 	; EDI = Directory buffer entry offset/address
  3975                              <1> 	; BL = File (or Directory) Attributes 
  3976                              <1> 	;	(Note: It was 'CL' in TRDOS v1)
  3977                              <1> 	; mov	bl, [EDI+0Bh]
  3978                              <1> 
  3979 00008C32 F6C307              <1> 	test	bl, 07h ; Attributes, S-H-R
  3980 00008C35 0F854EF7FFFF        <1> 	jnz	loc_permission_denied
  3981                              <1> 	
  3982 00008C3B BE[4A4C0100]        <1>         mov     esi, FindFile_Drv
  3983 00008C40 BF[904D0100]        <1>         mov     edi, SourceFile_Drv
  3984 00008C45 B920000000          <1> 	mov	ecx, 32
  3985 00008C4A F3A5                <1> 	rep	movsd
  3986                              <1> 
  3987                              <1> loc_rename_df_parse_path_name:
  3988 00008C4C 8B35[8C4D0100]      <1> 	mov	esi, [DestinationFilePath]
  3989 00008C52 BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  3990 00008C57 E80A150000          <1> 	call	parse_path_name
  3991 00008C5C 7219                <1> 	jc	short loc_rename_df_cmd_failed
  3992                              <1> 
  3993                              <1> 	;mov	dh, [RUN_CDRV]
  3994 00008C5E 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  3995                              <1> 
  3996                              <1> 	; 'rename' command is valid only for same dos drive and same dir!
  3997                              <1> 	; ('move' command must be used if source file and destination file
  3998                              <1> 	; directories are not same!) 
  3999 00008C64 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  4000 00008C6A 38F2                <1> 	cmp	dl, dh ; are source and destination drives different ?!
  4001 00008C6C 7509                <1> 	jne	short loc_rename_df_cmd_failed ; yes! 
  4002                              <1> 
  4003                              <1> rename_df_check_dirname_exists:
  4004 00008C6E 803D[4B4C0100]00    <1> 	cmp	byte [FindFile_Directory], 0
  4005 00008C75 760B                <1> 	jna	short rename_df_check_filename_exists
  4006                              <1> 
  4007                              <1> 	; different source file and destination file directories !
  4008                              <1> loc_rename_df_cmd_failed:
  4009 00008C77 B801000000          <1> 	mov	eax, 1 ; TRDOS 'Bad command or file name' error
  4010 00008C7C F9                  <1> 	stc
  4011 00008C7D E9FDF6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4012                              <1> 	  
  4013                              <1> rename_df_check_filename_exists:
  4014 00008C82 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  4015 00008C87 E883F6FFFF          <1> 	call	check_filename
  4016 00008C8C 0F829FF7FFFF        <1> 	jc	loc_mkdir_invalid_dir_name_chars
  4017                              <1> 
  4018                              <1> 	;mov	[DelFile_FNPointer], esi 
  4019                              <1> 	;cmp	byte [esi], 20h
  4020                              <1> 	;ja	short loc_rename_df_find
  4021                              <1> 
  4022                              <1> 	;mov	dh, [Current_Drv] ; dh has not been changed
  4023                              <1> 
  4024                              <1> rename_df_drv_check_writable:
  4025 00008C92 0FB6F6              <1> 	movzx	esi, dh
  4026                              <1> 	;movzx	esi, byte [Current_Drv]
  4027 00008C95 81C600010900        <1> 	add	esi, Logical_DOSDisks
  4028                              <1> 
  4029 00008C9B 88F2                <1> 	mov	dl, dh ; dl = [Current_Drv]
  4030 00008C9D 8A7601              <1> 	mov	dh, [esi+LD_DiskType]
  4031                              <1> 
  4032 00008CA0 80FE01              <1> 	cmp	dh, 1 ; 0 = Invalid
  4033 00008CA3 7310                <1> 	jnb	short rename_df_compare_sf_df_name
  4034                              <1> 
  4035                              <1> 	; 16/10/2016 (13h -> 30)
  4036 00008CA5 B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  4037 00008CAA 8B1D[8C4D0100]      <1> 	mov	ebx, [DestinationFilePath] 
  4038 00008CB0 E9CAF6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4039                              <1> 
  4040                              <1> rename_df_compare_sf_df_name:
  4041 00008CB5 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  4042 00008CBA BF[D24D0100]        <1> 	mov	edi, SourceFile_Name
  4043 00008CBF B90C000000          <1> 	mov	ecx, 12
  4044                              <1> rename_df_compare_sf_df_name_next: 
  4045 00008CC4 AC                  <1> 	lodsb
  4046 00008CC5 AE                  <1> 	scasb
  4047 00008CC6 7506                <1> 	jne	short loc_rename_df_find
  4048 00008CC8 08C0                <1> 	or	al, al
  4049 00008CCA 74AB                <1> 	jz	short loc_rename_df_cmd_failed
  4050 00008CCC E2F6                <1> 	loop	rename_df_compare_sf_df_name_next 
  4051                              <1> 
  4052                              <1> loc_rename_df_find:
  4053                              <1> 	;mov	esi, [DelFile_FNPointer]
  4054 00008CCE BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  4055                              <1> 
  4056 00008CD3 6631C0              <1> 	xor	ax, ax ; Any
  4057 00008CD6 E874F2FFFF          <1> 	call	find_first_file
  4058 00008CDB 730A                <1> 	jnc	short loc_rename_df_found
  4059                              <1> 
  4060                              <1> loc_rename_df_check_error_code:
  4061                              <1> 	;cmp	eax, 2
  4062 00008CDD 3C02                <1> 	cmp	al, 2 ; Not found error
  4063 00008CDF 7411                <1> 	je	short rename_df_move_find_struct_to_dest
  4064 00008CE1 F9                  <1> 	stc
  4065 00008CE2 E998F6FFFF          <1> 	jmp loc_file_rw_cmd_failed
  4066                              <1> 
  4067                              <1> loc_rename_df_found:
  4068                              <1> 	; 05/11/2016
  4069 00008CE7 B805000000          <1> 	mov	eax, 05h ; permission denied error
  4070 00008CEC F9                  <1> 	stc
  4071 00008CED E997F6FFFF          <1> 	jmp	loc_permission_denied  ; 06/11/2016
  4072                              <1> 
  4073                              <1> rename_df_move_find_struct_to_dest:
  4074 00008CF2 BE[4A4C0100]        <1>         mov     esi, FindFile_Drv
  4075 00008CF7 BF[104E0100]        <1>         mov     edi, DestinationFile_Drv
  4076 00008CFC B920000000          <1> 	mov	ecx, 32
  4077 00008D01 F3A5                <1> 	rep	movsd
  4078                              <1> 
  4079                              <1> loc_rename_df_process_q_sf:
  4080                              <1> 	;mov	ecx, 12
  4081 00008D03 B10C                <1> 	mov	cl, 12
  4082 00008D05 BE[D24D0100]        <1>  	mov	esi, SourceFile_Name
  4083 00008D0A BF[33040100]        <1> 	mov	edi, Rename_OldName
  4084                              <1> rename_df_process_q_nml_1_sf:
  4085 00008D0F AC                  <1> 	lodsb
  4086 00008D10 3C20                <1>         cmp	al, 20h
  4087 00008D12 7603                <1>         jna	short rename_df_process_q_nml_2_sf
  4088 00008D14 AA                  <1> 	stosb
  4089 00008D15 E2F8                <1> 	loop	rename_df_process_q_nml_1_sf
  4090                              <1> 
  4091                              <1> rename_df_process_q_nml_2_sf:
  4092 00008D17 C60700              <1> 	mov	byte [edi], 0
  4093                              <1> 
  4094                              <1> loc_rename_df_process_q_df:
  4095                              <1> 	;mov	ecx, 12
  4096 00008D1A B10C                <1> 	mov	cl, 12
  4097 00008D1C BE[524E0100]        <1> 	mov	esi, DestinationFile_Name
  4098 00008D21 BF[44040100]        <1> 	mov	edi, Rename_NewName
  4099                              <1> rename_df_process_q_nml_1_df:
  4100 00008D26 AC                  <1> 	lodsb
  4101 00008D27 3C20                <1> 	cmp	al, 20h
  4102 00008D29 7603                <1> 	jna	short loc_rename_df_process_q_nml_2_df
  4103 00008D2B AA                  <1> 	stosb
  4104 00008D2C E2F8                <1> 	loop	rename_df_process_q_nml_1_df
  4105                              <1> 
  4106                              <1> loc_rename_df_process_q_nml_2_df:
  4107 00008D2E C60700              <1> 	mov	byte [edi], 0
  4108                              <1> 
  4109                              <1> loc_rename_confirmation_question:
  4110 00008D31 BE[0B040100]        <1> 	mov	esi, Msg_DoYouWantRename
  4111 00008D36 E882D5FFFF          <1> 	call	print_msg
  4112                              <1> 
  4113 00008D3B A0[ED4D0100]        <1> 	mov	al, [SourceFile_DirEntry+11] ; Attributes
  4114 00008D40 2410                <1> 	and	al, 10h
  4115 00008D42 750C                <1> 	jnz	short rename_confirmation_question_dir
  4116                              <1> 
  4117                              <1> rename_confirmation_question_file:
  4118 00008D44 BE[22040100]        <1> 	mov	esi, Rename_File
  4119 00008D49 E86FD5FFFF          <1> 	call	print_msg 
  4120 00008D4E EB0A                <1> 	jmp	short rename_confirmation_question_as 
  4121                              <1> 
  4122                              <1> rename_confirmation_question_dir:
  4123 00008D50 BE[28040100]        <1> 	mov	esi, Rename_Directory
  4124 00008D55 E863D5FFFF          <1> 	call	print_msg
  4125                              <1> 
  4126                              <1> rename_confirmation_question_as:
  4127 00008D5A BE[33040100]        <1> 	mov	esi, Rename_OldName
  4128 00008D5F E859D5FFFF          <1> 	call	print_msg
  4129 00008D64 BE[40040100]        <1> 	mov	esi, Msg_File_rename_as
  4130 00008D69 E84FD5FFFF          <1> 	call	print_msg
  4131 00008D6E BE[67030100]        <1> 	mov	esi, Msg_YesNo
  4132 00008D73 E845D5FFFF          <1> 	call	print_msg
  4133                              <1> 
  4134                              <1> loc_rename_ask_again:
  4135 00008D78 30E4                <1> 	xor	ah, ah
  4136 00008D7A E8977EFFFF          <1> 	call	int16h
  4137 00008D7F 3C1B                <1> 	cmp	al, 1Bh
  4138 00008D81 740F                <1> 	je	short loc_do_not_rename_file
  4139 00008D83 24DF                <1> 	and	al, 0DFh
  4140 00008D85 A2[71030100]        <1> 	mov	[Y_N_nextline], al
  4141 00008D8A 3C59                <1> 	cmp	al, 'Y'
  4142 00008D8C 7404                <1> 	je	short loc_yes_rename_file
  4143 00008D8E 3C4E                <1> 	cmp	al, 'N'
  4144 00008D90 75E6                <1> 	jne	short loc_rename_ask_again
  4145                              <1> 
  4146                              <1> loc_do_not_rename_file:
  4147                              <1> loc_yes_rename_file:
  4148 00008D92 A2[71030100]        <1> 	mov	[Y_N_nextline], al
  4149 00008D97 6650                <1> 	push	ax
  4150 00008D99 BE[71030100]        <1> 	mov	esi, Y_N_nextline
  4151 00008D9E E81AD5FFFF          <1> 	call	print_msg
  4152 00008DA3 6658                <1> 	pop	ax
  4153                              <1> 	;cmp	al, 'Y' ; 'yes'
  4154                              <1> 	;cmc
  4155                              <1>         ;jnc	loc_file_rw_restore_retn
  4156 00008DA5 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4157 00008DA7 0F84D2F5FFFF        <1>         je	loc_file_rw_restore_retn  
  4158                              <1> 
  4159 00008DAD BE[44040100]        <1> 	mov	esi, Rename_NewName
  4160 00008DB2 668B0D[0A4E0100]    <1> 	mov	cx, [SourceFile_DirEntryNumber] 
  4161 00008DB9 66A1[F64D0100]      <1> 	mov	ax, [SourceFile_DirEntry+20] ; First Cluster, HW 
  4162 00008DBF 66C1E010            <1> 	shl	ax, 16
  4163 00008DC3 66A1[FC4D0100]      <1> 	mov	ax, [SourceFile_DirEntry+26] ; First Cluster, LW 
  4164                              <1> 
  4165 00008DC9 0FB61D[DF4D0100]    <1>   	movzx	ebx, byte [SourceFile_LongNameEntryLength]  
  4166 00008DD0 E8DB1B0000          <1>    	call	rename_directory_entry
  4167 00008DD5 E9D3F6FFFF          <1> 	jmp	loc_rename_file_ok	
  4168                              <1> ;loc_rename_file_ok:
  4169                              <1> ;	jc	loc_run_cmd_failed
  4170                              <1> ;	mov	esi, Msg_OK
  4171                              <1> ;	call	proc_printmsg
  4172                              <1> ;	jmp	loc_file_rw_restore_retn
  4173                              <1> 
  4174                              <1> move_file:
  4175                              <1> 	; 11/03/2016
  4176                              <1> 	; 09/03/2016
  4177                              <1> 	; 08/03/2016 (TRDOS 386 =  TRDOS v2.0)
  4178                              <1> 	; 21/05/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_move')
  4179                              <1> 	; 23/04/2011
  4180                              <1> 
  4181                              <1> get_move_source_fchar:
  4182                              <1> 	; esi = file name
  4183 00008DDA 803E20              <1> 	cmp	byte [esi], 20h
  4184 00008DDD 7614                <1>         jna	short loc_move_nofilename_retn
  4185                              <1> 
  4186 00008DDF 8935[884D0100]      <1> 	mov	[SourceFilePath], esi
  4187                              <1> 
  4188                              <1> move_scan_source_file:
  4189 00008DE5 46                  <1> 	inc	esi
  4190 00008DE6 803E20              <1> 	cmp	byte [esi], 20h
  4191 00008DE9 7409                <1>         je      short move_scan_destination_1
  4192                              <1> 	;jb	short loc_move_nofilename_retn
  4193 00008DEB 0F825CECFFFF        <1> 	jb	loc_cmd_failed
  4194 00008DF1 EBF2                <1> 	jmp	short move_scan_source_file
  4195                              <1> 
  4196                              <1> loc_move_nofilename_retn:
  4197 00008DF3 C3                  <1> 	retn
  4198                              <1> 
  4199                              <1> move_scan_destination_1:
  4200 00008DF4 C60600              <1> 	mov	byte [esi], 0
  4201                              <1> 
  4202                              <1> move_scan_destination_2:
  4203 00008DF7 46                  <1> 	inc	esi  
  4204 00008DF8 803E20              <1> 	cmp	byte [esi], 20h
  4205 00008DFB 74FA                <1> 	je	short move_scan_destination_2
  4206                              <1> 	;jb	short loc_move_nofilename_retn
  4207 00008DFD 0F824AECFFFF        <1> 	jb	loc_cmd_failed
  4208                              <1> 
  4209 00008E03 8935[8C4D0100]      <1> 	mov	[DestinationFilePath], esi
  4210                              <1> 
  4211                              <1> move_scan_destination_3:
  4212 00008E09 46                  <1> 	inc	esi  
  4213 00008E0A 803E20              <1> 	cmp	byte [esi], 20h
  4214 00008E0D 77FA                <1> 	ja	short move_scan_destination_3
  4215 00008E0F C60600              <1> 	mov	byte [esi], 0
  4216                              <1> 
  4217                              <1> loc_move_scan_destination_OK:
  4218 00008E12 8B35[884D0100]      <1> 	mov	esi, [SourceFilePath]
  4219 00008E18 8B3D[8C4D0100]      <1> 	mov	edi, [DestinationFilePath]
  4220                              <1> 
  4221 00008E1E B001                <1> 	mov	al, 1  ; move procedure Phase 1
  4222 00008E20 E8081C0000          <1> 	call	move_source_file_to_destination_file
  4223 00008E25 7328                <1> 	jnc	short move_source_file_to_destination_question
  4224                              <1> 
  4225                              <1> loc_move_cmd_failed_1:
  4226 00008E27 08C0                <1> 	or	al, al
  4227 00008E29 0F841EECFFFF        <1> 	jz	loc_cmd_failed 
  4228 00008E2F 3C11                <1> 	cmp	al, 11h
  4229 00008E31 740D                <1> 	je	short loc_msg_not_same_device   
  4230 00008E33 3C05                <1> 	cmp	al, 05h
  4231 00008E35 0F853DECFFFF        <1> 	jne	loc_run_cmd_failed
  4232                              <1> 
  4233 00008E3B E949F5FFFF          <1> 	jmp	loc_permission_denied
  4234                              <1> 
  4235                              <1> 	;mov	esi, Msg_Permission_denied
  4236                              <1> 	;call	print_msg
  4237                              <1> 	;jmp	loc_file_rw_restore_retn
  4238                              <1> 
  4239                              <1> loc_msg_not_same_device:
  4240 00008E40 BE[51040100]        <1> 	mov	esi, msg_not_same_drv 
  4241 00008E45 E873D4FFFF          <1> 	call	print_msg
  4242 00008E4A E930F5FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4243                              <1> 
  4244                              <1> move_source_file_to_destination_question:
  4245 00008E4F A0[904D0100]        <1>         mov     al, [SourceFile_Drv]
  4246 00008E54 0441                <1> 	add	al, 'A'
  4247 00008E56 A2[B3040100]        <1> 	mov	[msg_source_file_drv], al
  4248 00008E5B A0[104E0100]        <1>         mov     al, [DestinationFile_Drv]
  4249 00008E60 0441                <1> 	add	al, 'A'
  4250 00008E62 A2[D2040100]        <1> 	mov	[msg_destination_file_drv], al
  4251                              <1> 
  4252 00008E67 57                  <1> 	push	edi ; *
  4253                              <1> 
  4254 00008E68 BE[97040100]        <1> 	mov	esi, msg_source_file
  4255 00008E6D E84BD4FFFF          <1> 	call	print_msg
  4256 00008E72 BE[914D0100]        <1> 	mov	esi, SourceFile_Directory
  4257 00008E77 803E20              <1> 	cmp	byte [esi], 20h
  4258 00008E7A 7605                <1> 	jna	short msftdfq_sfn
  4259 00008E7C E83CD4FFFF          <1> 	call	print_msg
  4260                              <1> msftdfq_sfn:
  4261 00008E81 BE[D24D0100]        <1> 	mov	esi, SourceFile_Name
  4262 00008E86 E832D4FFFF          <1> 	call	print_msg
  4263 00008E8B BE[B6040100]        <1> 	mov	esi, msg_destination_file
  4264 00008E90 E828D4FFFF          <1> 	call	print_msg
  4265 00008E95 BE[114E0100]        <1> 	mov	esi, DestinationFile_Directory
  4266 00008E9A 803E20              <1> 	cmp	byte [esi], 20h
  4267 00008E9D 7605                <1> 	jna	short msftdfq_dfn
  4268 00008E9F E819D4FFFF          <1> 	call	print_msg
  4269                              <1> msftdfq_dfn:
  4270 00008EA4 BE[524E0100]        <1> 	mov	esi, DestinationFile_Name
  4271 00008EA9 E80FD4FFFF          <1> 	call	print_msg
  4272 00008EAE BE[D5040100]        <1> 	mov	esi, msg_copy_nextline
  4273 00008EB3 E805D4FFFF          <1> 	call	print_msg
  4274 00008EB8 BE[D5040100]        <1> 	mov	esi, msg_copy_nextline
  4275 00008EBD E8FBD3FFFF          <1> 	call	print_msg
  4276                              <1> 
  4277                              <1> loc_move_ask_for_new_file_yes_no:
  4278 00008EC2 BE[63040100]        <1> 	mov	esi, Msg_DoYouWantMoveFile
  4279 00008EC7 E8F1D3FFFF          <1> 	call	print_msg
  4280 00008ECC BE[67030100]        <1> 	mov	esi, Msg_YesNo
  4281 00008ED1 E8E7D3FFFF          <1> 	call	print_msg
  4282                              <1> loc_move_ask_for_new_file_again:
  4283 00008ED6 30E4                <1> 	xor	ah, ah
  4284 00008ED8 E8397DFFFF          <1> 	call	int16h
  4285 00008EDD 3C1B                <1> 	cmp	al, 1Bh
  4286                              <1> 	;je	short loc_do_not_move_file
  4287 00008EDF 744F                <1> 	je	short loc_move_y_n_escape
  4288 00008EE1 24DF                <1> 	and	al, 0DFh
  4289 00008EE3 A2[71030100]        <1>         mov     [Y_N_nextline], al
  4290 00008EE8 3C59                <1> 	cmp	al, 'Y'
  4291 00008EEA 7404                <1> 	je	short loc_yes_move_file
  4292 00008EEC 3C4E                <1> 	cmp	al, 'N'
  4293 00008EEE 75E6                <1> 	jne	short loc_move_ask_for_new_file_again
  4294                              <1> 
  4295                              <1> loc_do_not_move_file:
  4296                              <1> loc_yes_move_file:
  4297 00008EF0 A2[71030100]        <1> 	mov	[Y_N_nextline], al
  4298 00008EF5 6650                <1> 	push	ax
  4299 00008EF7 BE[71030100]        <1> 	mov	esi, Y_N_nextline
  4300 00008EFC E8BCD3FFFF          <1> 	call	print_msg
  4301 00008F01 6658                <1> 	pop	ax
  4302 00008F03 5F                  <1> 	pop	edi ; *
  4303                              <1> 	;cmp	al, 'Y' ; 'yes'
  4304                              <1> 	;cmc
  4305                              <1>         ;jnc	loc_file_rw_restore_retn
  4306 00008F04 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4307 00008F06 0F8473F4FFFF        <1>         je	loc_file_rw_restore_retn
  4308                              <1> 
  4309                              <1> loc_move_yes_move_file:
  4310 00008F0C B002                <1> 	mov	al, 2 ; move procedure Phase 2
  4311 00008F0E E81A1B0000          <1> 	call	move_source_file_to_destination_file
  4312                              <1> 	;jc	short loc_move_cmd_failed_2
  4313 00008F13 0F839AF5FFFF        <1>         jnc     move_source_file_to_destination_OK
  4314                              <1> 
  4315                              <1> ;move_source_file_to_destination_OK:
  4316                              <1> ;	mov	esi, Msg_OK
  4317                              <1> ;	call	print_msg
  4318                              <1> ;	jmp	loc_file_rw_restore_retn
  4319                              <1> 
  4320                              <1> loc_move_cmd_failed_2:
  4321 00008F19 3C27                <1> 	cmp	al, 27h
  4322 00008F1B 0F8557EBFFFF        <1> 	jne	loc_run_cmd_failed
  4323                              <1> 
  4324 00008F21 BE[7C040100]        <1> 	mov	esi, msg_insufficient_disk_space
  4325 00008F26 E892D3FFFF          <1> 	call	print_msg
  4326                              <1> 
  4327 00008F2B E94FF4FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4328                              <1> 
  4329                              <1> loc_move_y_n_escape:
  4330 00008F30 B04E                <1> 	mov	al, 'N' ; 'no'
  4331 00008F32 EBBC                <1> 	jmp	short loc_do_not_move_file
  4332                              <1> 
  4333                              <1> copy_file:
  4334                              <1> 	; 15/10/2016
  4335                              <1> 	; 24/03/2016
  4336                              <1> 	; 21/03/2016
  4337                              <1> 	; 15/03/2016 (TRDOS 386 =  TRDOS v2.0)
  4338                              <1> 	; 21/05/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_copy')
  4339                              <1> 	; 01/08/2010
  4340                              <1> 
  4341                              <1> get_copy_source_fchar:
  4342                              <1> 	; esi = file name
  4343 00008F34 803E20              <1> 	cmp	byte [esi], 20h
  4344 00008F37 7614                <1>         jna     short loc_copy_nofilename_retn
  4345                              <1> 
  4346 00008F39 8935[884D0100]      <1> 	mov	[SourceFilePath], esi
  4347                              <1> 
  4348                              <1> copy_scan_source_file:
  4349 00008F3F 46                  <1> 	inc	esi  
  4350 00008F40 803E20              <1> 	cmp	byte [esi], 20h
  4351 00008F43 7409                <1> 	je	short copy_scan_destination_1
  4352                              <1> 	;jb	short loc_copy_nofilename_retn
  4353 00008F45 0F8202EBFFFF        <1> 	jb	loc_cmd_failed
  4354 00008F4B EBF2                <1> 	jmp	short copy_scan_source_file
  4355                              <1> 
  4356                              <1> loc_copy_nofilename_retn:
  4357 00008F4D C3                  <1> 	retn
  4358                              <1> 
  4359                              <1> copy_scan_destination_1:
  4360 00008F4E C60600              <1> 	mov	byte [esi], 0
  4361                              <1> 
  4362                              <1> copy_scan_destination_2:
  4363 00008F51 46                  <1> 	inc	esi  
  4364 00008F52 803E20              <1> 	cmp	byte [esi], 20h
  4365 00008F55 74FA                <1> 	je	short copy_scan_destination_2
  4366                              <1> 	;jb	short loc_copy_nofilename_retn
  4367 00008F57 0F82F0EAFFFF        <1> 	jb	loc_cmd_failed
  4368                              <1> 
  4369 00008F5D 8935[8C4D0100]      <1> 	mov	[DestinationFilePath], esi
  4370                              <1> 
  4371                              <1> copy_scan_destination_3:
  4372 00008F63 46                  <1> 	inc	esi  
  4373 00008F64 803E20              <1> 	cmp	byte [esi], 20h
  4374 00008F67 77FA                <1> 	ja	short copy_scan_destination_3
  4375 00008F69 C60600              <1> 	mov	byte [esi], 0
  4376                              <1> 
  4377                              <1> loc_copy_save_current_drive:
  4378 00008F6C 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  4379 00008F72 8835[064B0100]      <1> 	mov	[RUN_CDRV], dh
  4380                              <1> 
  4381                              <1> copy_source_file_to_destination_phase_1:
  4382 00008F78 8B35[884D0100]      <1> 	mov	esi, [SourceFilePath]
  4383 00008F7E 8B3D[8C4D0100]      <1> 	mov	edi, [DestinationFilePath]
  4384                              <1> 
  4385 00008F84 B001                <1> 	mov	al, 1  ; copy procedure Phase 1
  4386 00008F86 E83F1D0000          <1> 	call	copy_source_file_to_destination_file
  4387 00008F8B 732B                <1> 	jnc	short copy_source_file_to_destination_question
  4388                              <1> 
  4389                              <1> loc_copy_cmd_failed_1:
  4390                              <1> 	; 18/03/2016 (restore current drive and directory)
  4391 00008F8D 08C0                <1> 	or	al, al
  4392 00008F8F 7507                <1> 	jnz	short loc_copy_cmd_failed_2
  4393                              <1> 
  4394 00008F91 FEC0                <1>         inc     al ; mov al, 1 ; Bad command or file name !
  4395 00008F93 E9E0EAFFFF          <1> 	jmp	loc_run_cmd_failed
  4396                              <1> 
  4397                              <1> loc_copy_cmd_failed_2:
  4398 00008F98 3C27                <1> 	cmp	al, 27h ; Insufficient disk space 
  4399 00008F9A 740D                <1> 	je	short loc_file_write_insuff_disk_space_msg
  4400                              <1>  
  4401 00008F9C 3C05                <1> 	cmp	al, 05h
  4402 00008F9E 0F85D4EAFFFF        <1> 	jne	loc_run_cmd_failed
  4403                              <1> 	
  4404 00008FA4 E9E0F3FFFF          <1> 	jmp	loc_permission_denied
  4405                              <1> 
  4406                              <1> loc_file_write_insuff_disk_space_msg:
  4407 00008FA9 BE[7C040100]        <1> 	mov	esi, msg_insufficient_disk_space
  4408 00008FAE E80AD3FFFF          <1> 	call	print_msg
  4409 00008FB3 E9C7F3FFFF          <1>         jmp     loc_file_rw_restore_retn 
  4410                              <1> 
  4411                              <1> copy_source_file_to_destination_question:
  4412 00008FB8 57                  <1> 	push	edi ; *
  4413                              <1> 
  4414                              <1> 	; dh = source file attributes
  4415                              <1> 	; dl > 0 -> destination file found
  4416 00008FB9 20D2                <1> 	and	dl, dl            
  4417 00008FBB 7449                <1> 	jz	short copy_source_file_to_destination_pass_owrq
  4418                              <1> 
  4419                              <1> loc_copy_ask_for_owr_yes_no:
  4420 00008FBD BE[D8040100]        <1> 	mov	esi, Msg_DoYouWantOverWriteFile
  4421 00008FC2 E8F6D2FFFF          <1> 	call	print_msg
  4422 00008FC7 BE[524E0100]        <1> 	mov	esi, DestinationFile_Name
  4423 00008FCC E8ECD2FFFF          <1> 	call	print_msg
  4424 00008FD1 BE[67030100]        <1> 	mov	esi, Msg_YesNo
  4425 00008FD6 E8E2D2FFFF          <1> 	call	print_msg
  4426                              <1> 
  4427                              <1> loc_copy_ask_for_owr_again:
  4428 00008FDB 30E4                <1> 	xor	ah, ah
  4429 00008FDD E8347CFFFF          <1> 	call	int16h
  4430 00008FE2 3C1B                <1> 	cmp	al, 1Bh
  4431                              <1>         ;je     loc_do_not_copy_file
  4432 00008FE4 7419                <1>         je      short loc_copy_y_n_escape
  4433 00008FE6 24DF                <1> 	and	al, 0DFh
  4434 00008FE8 A2[71030100]        <1>         mov     [Y_N_nextline], al
  4435 00008FED 3C59                <1> 	cmp	al, 'Y'
  4436 00008FEF 0F84B1000000        <1>         je      loc_yes_copy_file
  4437 00008FF5 3C4E                <1> 	cmp	al, 'N'
  4438 00008FF7 0F84A9000000        <1>         je      loc_do_not_copy_file
  4439 00008FFD EBDC                <1> 	jmp	short loc_copy_ask_for_owr_again
  4440                              <1> 
  4441                              <1> loc_copy_y_n_escape:
  4442 00008FFF B04E                <1> 	mov	al, 'N' ; 'no'
  4443 00009001 E9A0000000          <1>         jmp     loc_do_not_copy_file
  4444                              <1> 
  4445                              <1> copy_source_file_to_destination_pass_owrq:
  4446 00009006 A0[904D0100]        <1> 	mov     al, [SourceFile_Drv]
  4447 0000900B 0441                <1> 	add	al, 'A'
  4448 0000900D A2[B3040100]        <1> 	mov	[msg_source_file_drv], al
  4449 00009012 A0[104E0100]        <1>         mov     al, [DestinationFile_Drv]
  4450 00009017 0441                <1> 	add	al, 'A'
  4451 00009019 A2[D2040100]        <1> 	mov	[msg_destination_file_drv], al
  4452                              <1> 
  4453 0000901E BE[97040100]        <1> 	mov	esi, msg_source_file
  4454 00009023 E895D2FFFF          <1> 	call	print_msg
  4455 00009028 BE[914D0100]        <1> 	mov	esi, SourceFile_Directory
  4456 0000902D 803E20              <1> 	cmp	byte [esi], 20h
  4457 00009030 7605                <1> 	jna	short csftdfq_sfn
  4458 00009032 E886D2FFFF          <1> 	call	print_msg
  4459                              <1> csftdfq_sfn:
  4460 00009037 BE[D24D0100]        <1> 	mov	esi, SourceFile_Name
  4461 0000903C E87CD2FFFF          <1> 	call	print_msg
  4462 00009041 BE[B6040100]        <1> 	mov	esi, msg_destination_file
  4463 00009046 E872D2FFFF          <1> 	call	print_msg
  4464 0000904B BE[114E0100]        <1> 	mov	esi, DestinationFile_Directory
  4465 00009050 803E20              <1> 	cmp	byte [esi], 20h
  4466 00009053 7605                <1> 	jna	short csftdfq_dfn
  4467 00009055 E863D2FFFF          <1> 	call	print_msg
  4468                              <1> csftdfq_dfn:
  4469 0000905A BE[524E0100]        <1> 	mov	esi, DestinationFile_Name
  4470 0000905F E859D2FFFF          <1> 	call	print_msg
  4471 00009064 BE[D5040100]        <1> 	mov	esi, msg_copy_nextline
  4472 00009069 E84FD2FFFF          <1> 	call	print_msg
  4473 0000906E BE[D5040100]        <1> 	mov	esi, msg_copy_nextline
  4474 00009073 E845D2FFFF          <1> 	call	print_msg
  4475                              <1> 
  4476                              <1> loc_copy_ask_for_new_file_yes_no:
  4477 00009078 BE[F7040100]        <1> 	mov	esi, Msg_DoYouWantCopyFile
  4478 0000907D E83BD2FFFF          <1> 	call	print_msg
  4479 00009082 BE[67030100]        <1> 	mov	esi, Msg_YesNo
  4480 00009087 E831D2FFFF          <1> 	call	print_msg
  4481                              <1> 
  4482                              <1> loc_copy_ask_for_new_file_again:
  4483 0000908C 30E4                <1> 	xor	ah, ah
  4484 0000908E E8837BFFFF          <1> 	call	int16h
  4485 00009093 3C1B                <1> 	cmp	al, 1Bh
  4486 00009095 740F                <1> 	je	short loc_do_not_copy_file
  4487 00009097 24DF                <1> 	and	al, 0DFh
  4488 00009099 A2[71030100]        <1>         mov     [Y_N_nextline], al
  4489 0000909E 3C59                <1> 	cmp	al, 'Y'
  4490 000090A0 7404                <1> 	je	short loc_yes_copy_file
  4491 000090A2 3C4E                <1> 	cmp	al, 'N'
  4492 000090A4 75E6                <1> 	jne	short loc_copy_ask_for_new_file_again
  4493                              <1> 
  4494                              <1> loc_do_not_copy_file:
  4495                              <1> loc_yes_copy_file:
  4496 000090A6 A2[71030100]        <1> 	mov	[Y_N_nextline], al
  4497 000090AB 6650                <1> 	push	ax
  4498 000090AD BE[71030100]        <1> 	mov	esi, Y_N_nextline
  4499 000090B2 E806D2FFFF          <1> 	call	print_msg
  4500 000090B7 6658                <1> 	pop	ax
  4501 000090B9 5F                  <1> 	pop	edi ; *
  4502                              <1> 	;cmp	al, 'Y' ; 'yes'
  4503                              <1> 	;cmc
  4504                              <1>         ;jnc	loc_file_rw_restore_retn
  4505 000090BA 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4506 000090BC 0F84BDF2FFFF        <1>         je	loc_file_rw_restore_retn
  4507                              <1> 
  4508                              <1> copy_source_file_to_destination_pass_q:
  4509 000090C2 B002                <1> 	mov	al, 2  ; copy procedure Phase 2
  4510 000090C4 E8011C0000          <1> 	call	copy_source_file_to_destination_file
  4511                              <1> 	;jc	short loc_file_write_check_disk_space_err
  4512                              <1> 
  4513                              <1> 	; 24/03/2016
  4514 000090C9 6651                <1> 	push	cx
  4515 000090CB BE[D5040100]        <1> 	mov	esi, msg_copy_nextline
  4516 000090D0 E8E8D1FFFF          <1> 	call	print_msg
  4517                              <1> 	;pop	cx
  4518 000090D5 6658                <1> 	pop	ax
  4519                              <1> 
  4520                              <1> 	;or	cl, cl
  4521 000090D7 08C0                <1> 	or	al, al
  4522 000090D9 7419                <1> 	jz	short copy_source_file_to_destination_OK
  4523                              <1> 	
  4524                              <1> 	; 15/10/2016 (1Dh -> 18)
  4525                              <1> 	; 18/03/2016 (1Dh)
  4526                              <1> 	;cmp	cl, 18 ; write error
  4527 000090DB 3C12                <1> 	cmp	al, 18
  4528 000090DD 7506                <1> 	jne	short copy_source_file_to_destination_not_OK
  4529                              <1> 	;
  4530                              <1> 	;mov	al, cl ; error number (write fault!)
  4531 000090DF F9                  <1> 	stc
  4532 000090E0 E99AF2FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4533                              <1> 
  4534                              <1> copy_source_file_to_destination_not_OK:
  4535 000090E5 BE[10050100]        <1> 	mov	esi, Msg_read_file_error_before_EOF
  4536 000090EA E8CED1FFFF          <1> 	call	print_msg
  4537 000090EF E98BF2FFFF          <1> 	jmp	loc_file_rw_restore_retn	      
  4538                              <1>  
  4539                              <1> copy_source_file_to_destination_OK:
  4540 000090F4 BE[75030100]        <1> 	mov	esi, Msg_OK
  4541 000090F9 E8BFD1FFFF          <1> 	call	print_msg
  4542                              <1> 
  4543 000090FE E97CF2FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4544                              <1> 
  4545                              <1> ;loc_file_write_check_disk_space_err:
  4546                              <1> 	;cmp	al, 27h ; Insufficient disk space 
  4547                              <1> 	;je	loc_file_write_insuff_disk_space_msg
  4548                              <1>         ;jb	loc_file_rw_cmd_failed
  4549                              <1> 
  4550                              <1> 	;call	print_misc_error_msg ; 15/03/2016
  4551                              <1>         ;jmp	loc_file_rw_restore_retn 
  4552                              <1> 
  4553                              <1> change_fs_file_attributes:
  4554                              <1> 	; 04/03/2016 ; Temporary
  4555                              <1> 	; AL = File or directory attributes
  4556                              <1> 	; AH = 0 -> Attributes are in MS-DOS format
  4557                              <1> 	; AH > 0 -> Attributes are in SINGLIX format
  4558                              <1> 	;push	ebx
  4559                              <1> 	; ... do somethings here ...
  4560                              <1> 	;pop	ebx
  4561                              <1> 	; BL = File or directory attributes
  4562 00009103 C3                  <1> 	retn
  4563                              <1> 
  4564                              <1> set_get_env:
  4565                              <1> 	; 11/04/2016 (TRDOS 386 =  TRDOS v2.0)
  4566                              <1> 	; 02/09/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_set')
  4567                              <1> 	; 2005 - 28/08/2011 
  4568                              <1> get_setenv_fchar:
  4569                              <1> 	; esi = environment variable/string
  4570 00009104 8A06                <1> 	mov	al, [esi]
  4571 00009106 3C20                <1> 	cmp	al, 20h
  4572 00009108 771E                <1> 	ja	short loc_find_env
  4573                              <1> 
  4574 0000910A BE00300900          <1> 	mov	esi, Env_Page
  4575                              <1> loc_print_setline:
  4576 0000910F 803E00              <1> 	cmp	byte [esi], 0
  4577 00009112 7613                <1> 	jna	short loc_setenv_retn
  4578 00009114 E8A4D1FFFF          <1> 	call	print_msg
  4579 00009119 56                  <1> 	push	esi
  4580 0000911A BE[4F0B0100]        <1> 	mov	esi, nextline
  4581 0000911F E899D1FFFF          <1> 	call	print_msg 
  4582 00009124 5E                  <1> 	pop	esi
  4583 00009125 EBE8                <1> 	jmp	short loc_print_setline   
  4584                              <1> 
  4585                              <1> loc_setenv_retn: 
  4586 00009127 C3                  <1> 	retn
  4587                              <1> 
  4588                              <1> loc_find_env:
  4589 00009128 3C3D                <1> 	cmp	al, '='
  4590 0000912A 0F841DE9FFFF        <1> 	je	loc_cmd_failed
  4591                              <1> 
  4592 00009130 56                  <1> 	push	esi
  4593                              <1> loc_repeat_env_equal_check:
  4594 00009131 46                  <1> 	inc	esi
  4595 00009132 803E3D              <1> 	cmp	byte [esi], '='
  4596 00009135 7431                <1> 	je	short pass_env_equal_check
  4597 00009137 803E20              <1> 	cmp	byte [esi], 20h
  4598 0000913A 73F5                <1> 	jnb	short loc_repeat_env_equal_check
  4599 0000913C C60600              <1> 	mov	byte [esi], 0 
  4600 0000913F 5E                  <1> 	pop	esi
  4601 00009140 BF[A6430100]        <1> 	mov	edi, TextBuffer ; out buffer
  4602 00009145 B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4603 0000914A 30C0                <1> 	xor	al, al ; 0 -> use [ESI]
  4604 0000914C E89E000000          <1> 	call	get_environment_string
  4605 00009151 72D4                <1> 	jc	short loc_setenv_retn
  4606                              <1> 
  4607 00009153 BE[A6430100]        <1> 	mov	esi, TextBuffer
  4608 00009158 E860D1FFFF          <1> 	call	print_msg
  4609 0000915D BE[4F0B0100]        <1> 	mov	esi, nextline
  4610 00009162 E856D1FFFF          <1> 	call	print_msg
  4611                              <1> 
  4612 00009167 C3                  <1> 	retn 
  4613                              <1>               
  4614                              <1> pass_env_equal_check:
  4615 00009168 46                  <1> 	inc	esi
  4616 00009169 803E20              <1> 	cmp	byte [esi], 20h
  4617 0000916C 73FA                <1> 	jnb	short pass_env_equal_check
  4618 0000916E C60600              <1> 	mov	byte [esi], 0	
  4619                              <1> 
  4620                              <1> loc_call_set_env_string:
  4621 00009171 5E                  <1> 	pop	esi
  4622 00009172 E83B010000          <1> 	call	set_environment_string
  4623 00009177 73AE                <1> 	jnc	short loc_setenv_retn
  4624                              <1> 
  4625                              <1> loc_set_cmd_failed:
  4626 00009179 3C08                <1> 	cmp	al, 08h
  4627 0000917B 0F85CCE8FFFF        <1> 	jne	loc_cmd_failed
  4628                              <1> 
  4629 00009181 BE[50050100]        <1> 	mov	esi, Msg_No_Set_Space
  4630 00009186 E832D1FFFF          <1> 	call	print_msg
  4631                              <1> 
  4632 0000918B C3                  <1> 	retn
  4633                              <1> 
  4634                              <1> set_get_path:
  4635                              <1> 	; 11/04/2016 (TRDOS 386 =  TRDOS v2.0)
  4636                              <1> 	; 03/09/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_path')
  4637                              <1> 	; 2005
  4638                              <1> get_path_fchar:
  4639                              <1>  	; esi = path
  4640 0000918C 803E20              <1> 	cmp	byte [esi], 20h
  4641 0000918F 7737                <1> 	ja	short loc_set_path
  4642                              <1> 
  4643 00009191 BE00300900          <1> 	mov	esi, Env_Page
  4644                              <1> loc_print_path:
  4645 00009196 803E00              <1> 	cmp	byte [esi], 0
  4646 00009199 762C                <1> 	jna	short loc_path_retn
  4647                              <1> 
  4648 0000919B BE[AFFF0000]        <1> 	mov	esi, Cmd_Path ; 'PATH' address
  4649 000091A0 BF[A6430100]        <1> 	mov	edi, TextBuffer ; oout buffer
  4650 000091A5 30C0                <1> 	xor	al, al  ; use [ESI]
  4651 000091A7 B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4652 000091AC E83E000000          <1> 	call	get_environment_string
  4653 000091B1 7214                <1> 	jc	short loc_path_retn
  4654                              <1> 
  4655 000091B3 BE[A6430100]        <1> 	mov	esi, TextBuffer
  4656 000091B8 E800D1FFFF          <1> 	call	print_msg
  4657 000091BD BE[4F0B0100]        <1> 	mov	esi, nextline
  4658 000091C2 E8F6D0FFFF          <1> 	call	print_msg   
  4659                              <1> 
  4660                              <1> loc_path_retn: 
  4661 000091C7 C3                  <1> 	retn
  4662                              <1> 
  4663                              <1> loc_set_path:
  4664 000091C8 56                  <1> 	push	esi 
  4665                              <1> loc_set_path_find_end:
  4666 000091C9 46                  <1> 	inc	esi
  4667 000091CA 803E20              <1> 	cmp	byte [esi], 20h
  4668 000091CD 73FA                <1> 	jnb	short loc_set_path_find_end
  4669 000091CF C60600              <1> 	mov	byte [esi], 0 
  4670                              <1> loc_set_path_header: 
  4671 000091D2 5E                  <1> 	pop	esi	  
  4672 000091D3 4E                  <1> 	dec	esi
  4673 000091D4 C6063D              <1> 	mov	byte [esi], '='
  4674 000091D7 4E                  <1> 	dec	esi
  4675 000091D8 C60648              <1> 	mov	byte [esi], 'H'
  4676 000091DB 4E                  <1> 	dec	esi
  4677 000091DC C60654              <1> 	mov	byte [esi], 'T'
  4678 000091DF 4E                  <1> 	dec	esi
  4679 000091E0 C60641              <1> 	mov	byte [esi], 'A'
  4680 000091E3 4E                  <1> 	dec	esi
  4681 000091E4 C60650              <1> 	mov	byte [esi], 'P'   
  4682                              <1> 
  4683                              <1> loc_path_call_set_env_string:
  4684 000091E7 E8C6000000          <1> 	call	set_environment_string
  4685 000091EC 728B                <1>         jc	short loc_set_cmd_failed
  4686                              <1> 
  4687 000091EE C3                  <1> 	retn              
  4688                              <1> 
  4689                              <1> get_environment_string:
  4690                              <1> 	; 12/04/2016
  4691                              <1> 	; 11/04/2016
  4692                              <1> 	; 05/04/2016 (TRDOS 386 =  TRDOS v2.0)
  4693                              <1> 	; 02/09/2011 (TRDOS v1, MAINPROG.ASM)
  4694                              <1> 	; 28/08/2011
  4695                              <1> 	; INPUT->
  4696                              <1> 	;	EDI = Output buffer
  4697                              <1> 	;	CX = Buffer length (<= ENV_PAGE_SIZE)
  4698                              <1> 	;
  4699                              <1> 	;	AL > 0 = AL = String sequence number
  4700                              <1> 	;	AL = 0 -> ESI = ASCIIZ Set word 
  4701                              <1> 	;		(environment variable)
  4702                              <1> 	; OUTPUT ->
  4703                              <1> 	;	ESI is not changed
  4704                              <1> 	;	EDI is not changed
  4705                              <1> 	;	EAX = String length (with zero tail)
  4706                              <1> 	;	EDX = Environment variables page address
  4707                              <1> 	;	CF = 1 -> Not found (EAX not valid)
  4708                              <1> 	;
  4709                              <1> 	; (Modified registers: EAX, EDX) 
  4710                              <1> 
  4711 000091EF BA00300900          <1> 	mov	edx, Env_Page
  4712 000091F4 803A00              <1> 	cmp	byte [edx], 0
  4713 000091F7 7474                <1> 	jz	short get_env_string_with_word_stc_retn
  4714                              <1> 
  4715 000091F9 66890D[144F0100]    <1> 	mov	[env_var_length], cx
  4716                              <1> 
  4717 00009200 51                  <1> 	push	ecx ; *
  4718 00009201 56                  <1> 	push	esi ; **
  4719                              <1> 
  4720 00009202 08C0                <1> 	or	al, al
  4721 00009204 7449                <1> 	jz	short get_env_string_with_word
  4722                              <1> 
  4723                              <1> get_env_string_with_seq_number:
  4724 00009206 B101                <1> 	mov	cl, 1
  4725 00009208 88C5                <1> 	mov	ch, al
  4726 0000920A 31C0                <1> 	xor	eax, eax
  4727 0000920C 89D6                <1> 	mov	esi, edx ; Env_Page
  4728                              <1> 
  4729                              <1> get_env_string_seq_number_check:
  4730 0000920E 38CD                <1> 	cmp	ch, cl
  4731 00009210 7726                <1> 	ja	short get_env_string_seq_number_next
  4732                              <1> 
  4733                              <1> get_env_string_move_to_buff:
  4734 00009212 57                  <1> 	push	edi ; ***
  4735                              <1> 
  4736 00009213 29D2                <1> 	sub	edx, edx
  4737                              <1> 
  4738                              <1> get_env_string_seq_number_repeat1:
  4739 00009215 42                  <1> 	inc	edx
  4740 00009216 AC                  <1> 	lodsb
  4741 00009217 AA                  <1> 	stosb
  4742                              <1> 
  4743 00009218 66FF0D[144F0100]    <1> 	dec	word [env_var_length]
  4744 0000921F 7508                <1> 	jnz	short get_env_string_seq_number_repeat3
  4745                              <1> 
  4746                              <1> get_env_string_seq_number_repeat2:
  4747 00009221 20C0                <1> 	and	al, al
  4748 00009223 7408                <1> 	jz	short get_env_string_seq_number_ok
  4749 00009225 42                  <1> 	inc	edx
  4750 00009226 AC                  <1> 	lodsb
  4751 00009227 EBF8                <1> 	jmp	short get_env_string_seq_number_repeat2
  4752                              <1> 
  4753                              <1> get_env_string_seq_number_repeat3:
  4754 00009229 08C0                <1> 	or	al, al
  4755 0000922B 75E8                <1> 	jnz	short get_env_string_seq_number_repeat1
  4756                              <1> 
  4757                              <1> get_env_string_seq_number_ok:
  4758 0000922D 5F                  <1> 	pop	edi ; ***
  4759 0000922E 89D0                <1> 	mov	eax, edx ; Length of the environment string
  4760                              <1> 			 ; (ASCIIZ, includes ZERO tail)
  4761 00009230 BA00300900          <1> 	mov	edx, Env_Page
  4762                              <1> 
  4763                              <1> get_env_string_stc_retn:
  4764 00009235 5E                  <1> 	pop	esi ; **
  4765 00009236 59                  <1> 	pop	ecx ; *
  4766 00009237 C3                  <1> 	retn   
  4767                              <1> 	
  4768                              <1> get_env_string_seq_number_next:
  4769 00009238 AC                  <1> 	lodsb
  4770 00009239 08C0                <1> 	or	al, al
  4771 0000923B 75FB                <1> 	jnz	short get_env_string_seq_number_next
  4772                              <1> 
  4773 0000923D 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; +512 (+4096)
  4774 00009243 F5                  <1> 	cmc
  4775 00009244 72EF                <1> 	jc	short get_env_string_stc_retn
  4776                              <1> 
  4777 00009246 AC                  <1> 	lodsb
  4778 00009247 3C01                <1> 	cmp	al, 1
  4779 00009249 72EA                <1> 	jb	short get_env_string_stc_retn
  4780 0000924B FEC1                <1> 	inc	cl
  4781 0000924D EBBF                <1> 	jmp	short get_env_string_seq_number_check
  4782                              <1> 
  4783                              <1> get_env_string_with_word:
  4784 0000924F 31C9                <1> 	xor	ecx, ecx
  4785                              <1> 
  4786                              <1> get_env_string_calc_word_length:
  4787 00009251 AC                  <1> 	lodsb 
  4788 00009252 3C20                <1> 	cmp	al, 20h
  4789 00009254 7211                <1> 	jb	short get_env_string_calc_word_length_ok
  4790                              <1> 	;inc	cx
  4791 00009256 FEC1                <1> 	inc	cl
  4792                              <1> 
  4793 00009258 3C61                <1> 	cmp	al, 'a'
  4794 0000925A 72F5                <1> 	jb	short get_env_string_calc_word_length
  4795 0000925C 3C7A                <1> 	cmp	al, 'z'
  4796 0000925E 77F1                <1> 	ja	short get_env_string_calc_word_length
  4797 00009260 24DF                <1> 	and	al, 0DFh
  4798 00009262 8846FF              <1> 	mov	[esi-1], al
  4799 00009265 EBEA                <1> 	jmp	short get_env_string_calc_word_length
  4800                              <1> 	
  4801                              <1> get_env_string_calc_word_length_ok:
  4802 00009267 08C9                <1> 	or	cl, cl
  4803 00009269 7506                <1> 	jnz	short get_env_string_calc_word_length_save
  4804                              <1>      
  4805 0000926B 5E                  <1> 	pop	esi ; **
  4806                              <1> 
  4807                              <1> get_env_string_stc_retn1:
  4808 0000926C 59                  <1> 	pop	ecx ; *
  4809                              <1>         
  4810                              <1> get_env_string_with_word_stc_retn:
  4811 0000926D 31C0                <1> 	xor	eax, eax  
  4812 0000926F F9                  <1> 	stc
  4813 00009270 C3                  <1> 	retn
  4814                              <1>   
  4815                              <1> get_env_string_calc_word_length_save:
  4816 00009271 871C24              <1> 	xchg	ebx, [esp] ; **
  4817 00009274 89DE                <1> 	mov	esi, ebx 
  4818                              <1> 		; Start of the env string (to be searched)
  4819                              <1> 
  4820 00009276 57                  <1> 	push	edi ; ***
  4821 00009277 89D7                <1> 	mov	edi, edx ; Env_Page
  4822                              <1> 
  4823                              <1> get_env_string_compare:
  4824 00009279 57                  <1> 	push	edi ; ****
  4825 0000927A 51                  <1> 	push	ecx ; ***** ; Variable name length
  4826                              <1> 
  4827                              <1> get_env_string_compare_rep:
  4828 0000927B AC                  <1> 	lodsb
  4829 0000927C AE                  <1> 	scasb
  4830 0000927D 7511                <1> 	jne	short get_env_string_compare_next1
  4831 0000927F E2FA                <1> 	loop	get_env_string_compare_rep
  4832                              <1> 	
  4833 00009281 803F3D              <1> 	cmp	byte [edi], '='
  4834 00009284 750A                <1> 	jne	short get_env_string_compare_next1
  4835                              <1>  
  4836 00009286 59                  <1> 	pop	ecx ; *****
  4837 00009287 5F                  <1> 	pop	edi ; ****
  4838 00009288 89FE                <1> 	mov	esi, edi
  4839 0000928A 5F                  <1> 	pop	edi ; ***
  4840 0000928B 871C24              <1> 	xchg	ebx, [esp] ; **
  4841 0000928E EB82                <1> 	jmp	short get_env_string_move_to_buff
  4842                              <1> 
  4843                              <1> get_env_string_compare_next1:
  4844 00009290 89FE                <1> 	mov	esi, edi
  4845 00009292 59                  <1> 	pop	ecx ; *****
  4846 00009293 5F                  <1> 	pop	edi ; ****
  4847                              <1> get_env_string_compare_next2:
  4848 00009294 81FEFF310900        <1> 	cmp	esi, Env_Page + Env_Page_Size - 1 ; +511 (+4095)
  4849 0000929A 7310                <1> 	jnb	short get_env_string_compare_not_ok
  4850 0000929C 20C0                <1> 	and	al, al
  4851 0000929E AC                  <1> 	lodsb
  4852 0000929F 75F3                <1> 	jnz	short get_env_string_compare_next2
  4853 000092A1 08C0                <1> 	or	al, al
  4854 000092A3 7407                <1> 	jz	short get_env_string_compare_not_ok
  4855 000092A5 4E                  <1> 	dec	esi ; 12/04/2016
  4856 000092A6 89F7                <1> 	mov	edi, esi
  4857 000092A8 89DE                <1> 	mov	esi, ebx
  4858 000092AA EBCD                <1> 	jmp	short get_env_string_compare
  4859                              <1> 
  4860                              <1> get_env_string_compare_not_ok:
  4861 000092AC 5F                  <1> 	pop	edi ; ***
  4862 000092AD 89DE                <1> 	mov	esi, ebx
  4863 000092AF 5B                  <1> 	pop	ebx ; **
  4864 000092B0 EBBA                <1> 	jmp	short get_env_string_stc_retn1
  4865                              <1> 
  4866                              <1> set_environment_string:
  4867                              <1> 	; 13/04/2016
  4868                              <1> 	; 12/04/2016
  4869                              <1> 	; 11/04/2016
  4870                              <1> 	; 06/04/2016
  4871                              <1> 	; 05/04/2016 (TRDOS 386 = TRDOS v2.0)
  4872                              <1> 	; 02/09/2011 (TRDOS v1, MAINPROG.ASM)
  4873                              <1> 	; 29/08/2011
  4874                              <1> 	; 29/08/2011
  4875                              <1> 	; INPUT->
  4876                              <1> 	;	ESI = ASCIIZ environment string
  4877                              <1> 	; OUTPUT ->
  4878                              <1> 	;	ESI is not changed
  4879                              <1> 	;	CF = 1 -> Could not set, 
  4880                              <1> 	;	     insufficient environment space
  4881                              <1> 	;
  4882                              <1> 	; (EAX, EDX will be changed) 
  4883                              <1> 	;
  4884                              <1> 	;    (EAX = Start address of the env string if > 0)	
  4885                              <1> 	;    (EDX = Environment string length)	
  4886                              <1> 
  4887 000092B2 56                  <1> 	push 	esi ; *
  4888                              <1> 
  4889 000092B3 31C0                <1> 	xor	eax, eax
  4890                              <1> 
  4891                              <1> set_env_chk_validation1:
  4892 000092B5 FEC4                <1> 	inc	ah ; variable (string) length
  4893 000092B7 AC                  <1> 	lodsb
  4894 000092B8 3C3D                <1> 	cmp	al, '='
  4895 000092BA 7415                <1> 	je	short set_env_chk_validation2
  4896 000092BC 3C20                <1> 	cmp	al, 20h
  4897 000092BE 720F                <1> 	jb	short set_env_string_stc
  4898                              <1> 
  4899                              <1> 	; 06/04/2016
  4900 000092C0 3C61                <1> 	cmp	al, 'a'
  4901 000092C2 72F1                <1> 	jb	short set_env_chk_validation1
  4902 000092C4 3C7A                <1> 	cmp	al, 'z'
  4903 000092C6 77ED                <1> 	ja	short set_env_chk_validation1
  4904 000092C8 2C20                <1> 	sub	al, 'a'-'A'
  4905 000092CA 8846FF              <1> 	mov	[esi-1], al
  4906 000092CD EBE6                <1> 	jmp	short set_env_chk_validation1
  4907                              <1> 
  4908                              <1> set_env_string_stc:
  4909 000092CF 5E                  <1> 	pop	esi ; *
  4910                              <1> 	;stc
  4911 000092D0 C3                  <1> 	retn 
  4912                              <1> 	   
  4913                              <1> set_env_chk_validation2:
  4914 000092D1 51                  <1> 	push	ecx ; **
  4915 000092D2 53                  <1> 	push	ebx ; *** 
  4916 000092D3 57                  <1> 	push	edi ; ****
  4917                              <1> 
  4918                              <1> 	; 12/04/2016
  4919 000092D4 8B5C240C            <1> 	mov	ebx, [esp+12]
  4920                              <1> 
  4921                              <1> set_env_chk_validation2w:
  4922 000092D8 89F7                <1> 	mov	edi, esi
  4923 000092DA 4F                  <1> 	dec	edi
  4924                              <1> 
  4925 000092DB 807FFF20            <1> 	cmp	byte [edi-1], 20h
  4926 000092DF 771A                <1> 	ja	short set_env_chk_validation2z
  4927                              <1> 	
  4928 000092E1 56                  <1> 	push	esi
  4929 000092E2 89FE                <1> 	mov	esi, edi
  4930 000092E4 4E                  <1> 	dec	esi
  4931                              <1> 
  4932                              <1> set_env_chk_validation2x:
  4933 000092E5 4E                  <1> 	dec	esi
  4934                              <1> 
  4935 000092E6 39DE                <1> 	cmp	esi, ebx
  4936 000092E8 7207                <1> 	jb	short set_env_chk_validation2y
  4937                              <1> 
  4938 000092EA 4F                  <1> 	dec	edi
  4939                              <1> 
  4940 000092EB 8A06                <1> 	mov	al, [esi]
  4941 000092ED 8807                <1> 	mov	[edi], al
  4942                              <1> 
  4943 000092EF EBF4                <1> 	jmp	short set_env_chk_validation2x
  4944                              <1> 
  4945                              <1> set_env_chk_validation2y:
  4946 000092F1 5E                  <1> 	pop	esi
  4947                              <1> 
  4948                              <1> 	;mov	byte [ebx], 20h
  4949                              <1> 	
  4950 000092F2 43                  <1> 	inc 	ebx
  4951 000092F3 895C240C            <1> 	mov	[esp+12], ebx
  4952                              <1> 
  4953 000092F7 FECC                <1> 	dec 	ah ; 13/04/2016
  4954                              <1> 
  4955 000092F9 EBDD                <1> 	jmp	short set_env_chk_validation2w
  4956                              <1> 	
  4957                              <1> set_env_chk_validation2z:	
  4958 000092FB BA00300900          <1> 	mov	edx, Env_Page
  4959 00009300 89D7                <1> 	mov	edi, edx
  4960                              <1> 
  4961                              <1> set_env_chk_validation3:
  4962 00009302 AC                  <1> 	lodsb
  4963 00009303 3C20                <1> 	cmp	al, 20h
  4964 00009305 74FB                <1> 	je	short set_env_chk_validation3
  4965                              <1> 
  4966 00009307 9C                  <1> 	pushf
  4967                              <1> 
  4968                              <1> 	; 12/04/2016
  4969                              <1> set_env_chk_validation3n:
  4970 00009308 3C61                <1> 	cmp	al, 'a'
  4971 0000930A 720C                <1> 	jb	short set_env_chk_validation3c
  4972 0000930C 3C7A                <1> 	cmp	al, 'z'
  4973 0000930E 7705                <1> 	ja	short set_env_chk_validation3x
  4974 00009310 2C20                <1> 	sub	al, 'a'-'A'
  4975 00009312 8846FF              <1> 	mov	[esi-1], al
  4976                              <1> 
  4977                              <1> set_env_chk_validation3x:
  4978 00009315 AC                  <1> 	lodsb
  4979 00009316 EBF0                <1> 	jmp	short set_env_chk_validation3n
  4980                              <1> 
  4981                              <1> set_env_chk_validation3c:
  4982 00009318 3C20                <1> 	cmp	al, 20h
  4983 0000931A 73F9                <1> 	jnb	short set_env_chk_validation3x
  4984                              <1> 		
  4985 0000931C 803F00              <1> 	cmp	byte [edi], 0
  4986 0000931F 7731                <1> 	ja	short set_env_chk_validation4
  4987                              <1> 
  4988 00009321 9D                  <1> 	popf
  4989 00009322 7228                <1> 	jb	short set_env_string_nothing
  4990                              <1> 
  4991 00009324 B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)
  4992                              <1> 
  4993 00009329 89DE                <1> 	mov	esi, ebx ; 12/04/2016
  4994                              <1> 
  4995                              <1> set_env_string_copy_to_envb:
  4996 0000932B AC                  <1> 	lodsb
  4997 0000932C 3C20                <1> 	cmp	al, 20h
  4998 0000932E 720A                <1> 	jb	short set_env_string_copy_to_envb_z
  4999 00009330 AA                  <1> 	stosb
  5000 00009331 E2F8                <1> 	loop	set_env_string_copy_to_envb
  5001                              <1> 
  5002                              <1> 	; 11/04/2016
  5003 00009333 89D7                <1> 	mov	edi, edx ; Env_Page
  5004 00009335 B900020000          <1> 	mov	ecx, Env_Page_Size 
  5005                              <1> 
  5006                              <1> set_env_string_copy_to_envb_z:
  5007 0000933A 52                  <1> 	push	edx  ; Start address of the variable
  5008 0000933B BA00020000          <1> 	mov	edx, Env_Page_Size
  5009 00009340 29CA                <1> 	sub	edx, ecx ; variable (string) length
  5010                              <1> 
  5011 00009342 28C0                <1> 	sub	al, al ; 0
  5012 00009344 F3AA                <1>  	rep	stosb ; clear remain bytes of the env page
  5013                              <1> 
  5014 00009346 58                  <1> 	pop	eax  ; Start address of the variable
  5015                              <1> 
  5016                              <1> set_env_string_allocate_envb_retn:  ; stc or clc return
  5017 00009347 5F                  <1> 	pop	edi ; ****
  5018 00009348 5B                  <1> 	pop	ebx ; ***
  5019 00009349 59                  <1> 	pop	ecx ; **
  5020 0000934A 5E                  <1> 	pop	esi ; *	
  5021 0000934B C3                  <1> 	retn
  5022                              <1> 
  5023                              <1> set_env_string_nothing:
  5024 0000934C 31C0                <1> 	xor	eax, eax
  5025 0000934E 31D2                <1> 	xor	edx, edx ; 11/04/2016
  5026 00009350 EBF5                <1> 	jmp	short set_env_string_allocate_envb_retn
  5027                              <1> 
  5028                              <1> set_env_chk_validation4:
  5029                              <1> 	; 11/04/2016
  5030 00009352 9D                  <1> 	popf
  5031                              <1> 
  5032 00009353 89D6                <1> 	mov	esi, edx  ; Env_Page
  5033                              <1> 
  5034                              <1> set_env_chk_validation5:	
  5035 00009355 89DF                <1> 	mov	edi, ebx  ; ASCIIZ environment string address	
  5036 00009357 0FB6CC              <1> 	movzx	ecx, ah ; Variable (string) length (with '=')
  5037                              <1> 
  5038                              <1> set_env_chk_validation5_loop:
  5039 0000935A AC                  <1> 	lodsb
  5040 0000935B AE                  <1> 	scasb
  5041 0000935C 750A                <1> 	jne	short set_env_chk_validation6
  5042 0000935E E2FA                <1> 	loop	set_env_chk_validation5_loop
  5043                              <1> 
  5044 00009360 3C3D                <1> 	cmp	al, '='
  5045 00009362 0F8483000000        <1>         je      set_env_change_variable
  5046                              <1> 
  5047                              <1> set_env_chk_validation6:
  5048 00009368 08C0                <1> 	or	al, al ; 0
  5049 0000936A 7403                <1> 	jz	short set_env_chk_validation7
  5050                              <1> 
  5051 0000936C AC                  <1> 	lodsb
  5052 0000936D EBF9                <1> 	jmp	short set_env_chk_validation6
  5053                              <1> 
  5054                              <1> set_env_chk_validation7:
  5055 0000936F 88E1                <1> 	mov	cl, ah
  5056 00009371 01F1                <1> 	add	ecx, esi
  5057 00009373 81F9FF310900        <1> 	cmp	ecx, Env_Page + Env_Page_Size - 1 
  5058                              <1> 		; 511 (4095) 
  5059                              <1> 		; strlen + '=' + 0
  5060 00009379 72DA                <1> 	jb	short set_env_chk_validation5
  5061                              <1> 
  5062                              <1> set_env_chk_validation8: ; variable not found
  5063 0000937B 0FB6F4              <1> 	movzx	esi, ah  ; variable name length (with '=') 
  5064 0000937E 01DE                <1> 	add	esi, ebx ; position just after of the '='
  5065                              <1> 
  5066                              <1> set_env_chk_validation8_loop:
  5067 00009380 AC                  <1> 	lodsb
  5068 00009381 3C20                <1> 	cmp	al, 20h
  5069 00009383 74FB                <1> 	je	short set_env_chk_validation8_loop	
  5070 00009385 72C5                <1> 	jb	short set_env_string_nothing
  5071                              <1> 
  5072                              <1> set_env_chk_validation9:
  5073 00009387 AC                  <1> 	lodsb
  5074 00009388 3C20                <1> 	cmp	al, 20h
  5075 0000938A 73FB                <1> 	jnb	short set_env_chk_validation9
  5076                              <1> 
  5077                              <1> 	; End of ASCIIZ environment string
  5078                              <1> 
  5079                              <1> set_env_add_variable:
  5080 0000938C 29DE                <1> 	sub	esi, ebx ; variable+definition length
  5081                              <1> 	
  5082 0000938E 56                  <1> 	push	esi ; *****
  5083                              <1> 
  5084 0000938F 89D6                <1> 	mov	esi, edx ; Environment page address
  5085                              <1> 
  5086 00009391 B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)	
  5087                              <1> 
  5088                              <1> set_env_add_variable_loop:
  5089 00009396 AC                  <1> 	lodsb
  5090 00009397 20C0                <1> 	and	al, al		
  5091 00009399 7406                <1> 	jz	short set_env_add_variable_chk1 ; 0
  5092 0000939B E2F9                <1> 	loop	set_env_add_variable_loop
  5093                              <1> 
  5094                              <1> 	; 11/04/2016
  5095 0000939D 884EFF              <1> 	mov	[esi-1], cl ; 0
  5096 000093A0 41                  <1> 	inc	ecx
  5097                              <1> 	
  5098                              <1> set_env_add_variable_chk1: 
  5099 000093A1 49                  <1> 	dec	ecx
  5100 000093A2 7408                <1> 	jz	short set_env_add_variable_nspc
  5101 000093A4 AC                  <1> 	lodsb
  5102 000093A5 08C0                <1> 	or 	al, al
  5103 000093A7 740C                <1> 	jz	short set_env_add_variable_chk2 ; 00
  5104 000093A9 49                  <1> 	dec	ecx
  5105 000093AA 75EA                <1> 	jnz	short set_env_add_variable_loop
  5106                              <1> 
  5107                              <1> set_env_add_variable_nspc: ; no space on environment page
  5108 000093AC 58                  <1> 	pop	eax ; *****
  5109 000093AD B808000000          <1> 	mov	eax, 8 ; No space for new environment string
  5110 000093B2 F9                  <1> 	stc
  5111 000093B3 EB92                <1>         jmp     short set_env_string_allocate_envb_retn
  5112                              <1> 
  5113                              <1> set_env_add_variable_chk2:
  5114 000093B5 8B0C24              <1> 	mov	ecx, [esp] ; *****
  5115 000093B8 4E                  <1> 	dec	esi ; beginning address of the new variable
  5116 000093B9 89F0                <1> 	mov	eax, esi
  5117 000093BB 01C8                <1> 	add	eax, ecx ; string length (with CR)
  5118 000093BD 81C200020000        <1> 	add	edx, Env_Page_Size ; 512 (4096)
  5119 000093C3 39D0                <1> 	cmp	eax, edx 
  5120 000093C5 77E5                <1> 	ja	short set_env_add_variable_nspc
  5121 000093C7 49                  <1> 	dec	ecx ; except CR at the end
  5122 000093C8 89CA                <1> 	mov	edx, ecx ; 12/04/2016
  5123 000093CA 89F7                <1> 	mov	edi, esi
  5124 000093CC 893C24              <1> 	mov	[esp], edi ; ***** ; Start address of new variable
  5125 000093CF 89DE                <1> 	mov	esi, ebx ; ASCIIZ environment string address
  5126 000093D1 F3A4                <1> 	rep	movsb
  5127 000093D3 28C0                <1> 	sub	al, al
  5128 000093D5 AA                  <1> 	stosb
  5129 000093D6 58                  <1> 	pop	eax ; ***** ; Beginning address of new variable			
  5130 000093D7 81FF00320900        <1>         cmp     edi, Env_Page + Env_Page_Size ; 12/04/2016
  5131 000093DD 0F8364FFFFFF        <1>         jnb     set_env_string_allocate_envb_retn ; OK !
  5132 000093E3 880F                <1> 	mov	[edi], cl ; 0
  5133 000093E5 F8                  <1> 	clc	; 13/04/2016
  5134 000093E6 E95CFFFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5135                              <1> 
  5136                              <1> set_env_change_variable:
  5137                              <1> 	; 06/04/2016
  5138                              <1> 	; esi = Variable's address in environment page (after '=')
  5139                              <1> 	; edi = ASCIIZ environment string address (after '=')
  5140                              <1> 
  5141                              <1> 	; ah = variable length from start to the '='
  5142 000093EB 8825[144F0100]      <1> 	mov	[env_var_length], ah
  5143                              <1> 
  5144 000093F1 28C9                <1> 	sub	cl, cl ; ecx = 0
  5145                              <1> 
  5146 000093F3 57                  <1> 	push	edi ; *****
  5147                              <1> 
  5148 000093F4 89F7                <1> 	mov	edi, esi ; 11/04/2016
  5149                              <1> 
  5150                              <1> set_env_change_variable_calc1:
  5151 000093F6 AC                  <1> 	lodsb
  5152 000093F7 08C0                <1> 	or	al, al
  5153 000093F9 7403                <1> 	jz	short set_env_change_variable_calc2
  5154                              <1> 
  5155 000093FB 41                  <1> 	inc	ecx ; length of environment string (after the '=')
  5156                              <1> 
  5157 000093FC EBF8                <1> 	jmp	short set_env_change_variable_calc1	
  5158                              <1> 
  5159                              <1> set_env_change_variable_calc2:
  5160 000093FE 8B3424              <1> 	mov	esi, [esp] ; ASCIIZ environment string address
  5161                              <1> 	
  5162 00009401 29D2                <1> 	sub	edx, edx
  5163                              <1> 
  5164                              <1> set_env_change_variable_calc3:
  5165 00009403 AC                  <1> 	lodsb
  5166 00009404 3C20                <1> 	cmp	al, 20h
  5167 00009406 7203                <1> 	jb	short set_env_change_variable_calc4
  5168                              <1> 
  5169 00009408 42                  <1> 	inc	edx ; length of ASCIIZ string (after the '=')
  5170                              <1> 	
  5171 00009409 EBF8                <1> 	jmp	short set_env_change_variable_calc3
  5172                              <1> 	
  5173                              <1> set_env_change_variable_calc4:
  5174 0000940B C646FF00            <1> 	mov	byte [esi-1], 0  ; put ZERO instead of CR
  5175                              <1> 	
  5176 0000940F 5E                  <1> 	pop	esi ; ***** ; ASCIIZ string address (after '=')
  5177                              <1> 
  5178                              <1> 	; EDI = Old variable's address (after '=')
  5179                              <1> 	
  5180                              <1> 	; compare the new string with the old string
  5181 00009410 39CA                <1> 	cmp	edx, ecx
  5182 00009412 7717                <1> 	ja	short set_env_change_variable_calc5 ; longer
  5183 00009414 0F828F000000        <1>         jb      set_env_change_variable_calc9 ; shorter
  5184                              <1> 	
  5185                              <1> 	;same length (simple copy)
  5186 0000941A 0FB6C4              <1> 	movzx	eax, ah
  5187 0000941D 01C2                <1> 	add	edx, eax
  5188 0000941F F7D8                <1> 	neg	eax
  5189 00009421 01F8                <1> 	add	eax, edi
  5190                              <1> 	; EAX = Start address of the variable
  5191                              <1> 	; EDX = Variable length (without ZERO at the end of variable)
  5192                              <1> 
  5193 00009423 F3A4                <1> 	rep	movsb
  5194 00009425 F8                  <1> 	clc	; 13/04/2016
  5195 00009426 E91CFFFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5196                              <1> 
  5197                              <1> set_env_change_variable_calc5:
  5198                              <1> 	; 11/04/2016
  5199 0000942B 52                  <1> 	push	edx ; *****
  5200 0000942C 29CA                <1> 	sub	edx, ecx ; difference ; (the new string is longer)
  5201 0000942E 89F3                <1> 	mov 	ebx, esi
  5202 00009430 89FE                <1> 	mov	esi, edi
  5203                              <1> 
  5204                              <1> set_env_change_variable_calc6:
  5205 00009432 AC                  <1> 	lodsb 
  5206 00009433 20C0                <1> 	and	al, al
  5207 00009435 75FB                <1> 	jnz	short set_env_change_variable_calc6
  5208                              <1> 
  5209 00009437 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5210 0000943D 0F8369FFFFFF        <1>         jnb     set_env_add_variable_nspc
  5211                              <1> 
  5212 00009443 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5213 00009445 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5214                              <1> 
  5215 00009447 AC                  <1> 	lodsb
  5216 00009448 08C0                <1> 	or	al, al
  5217 0000944A 7416                <1> 	jz	short set_env_change_variable_calc8 ; 00
  5218                              <1> 
  5219                              <1> set_env_change_variable_calc7:
  5220 0000944C AC                  <1> 	lodsb
  5221 0000944D 20C0                <1> 	and	al, al
  5222 0000944F 75FB                <1> 	jnz	short set_env_change_variable_calc7
  5223                              <1> 
  5224 00009451 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5225 00009457 0F834FFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5226                              <1> 
  5227 0000945D AC                  <1> 	lodsb
  5228 0000945E 08C0                <1> 	or	al, al
  5229 00009460 75EA                <1> 	jnz	short set_env_change_variable_calc7
  5230                              <1> 
  5231                              <1> set_env_change_variable_calc8:
  5232 00009462 4E                  <1> 	dec	esi ; address of the second (last) 0 of the 00
  5233                              <1> 
  5234 00009463 01F2                <1> 	add	edx, esi ; final position of the last 0
  5235                              <1> 
  5236 00009465 81FA00320900        <1> 	cmp	edx, Env_Page + Env_Page_Size ; 512 (4096)
  5237 0000946B 0F833BFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5238                              <1> 
  5239 00009471 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5240                              <1> 
  5241 00009473 89F1                <1> 	mov	ecx, esi 
  5242 00009475 29F9                <1> 	sub	ecx, edi ; count of bytes to move forward
  5243                              <1> 
  5244                              <1> 	; 13/04/2016
  5245 00009477 C60200              <1> 	mov	byte [edx], 0
  5246 0000947A 89D7                <1> 	mov	edi, edx
  5247 0000947C 29F2                <1> 	sub	edx, esi ; difference (additional byte count)
  5248 0000947E 4F                  <1> 	dec	edi ; the last zero address (first byte of the 00)
  5249 0000947F 89FE                <1> 	mov	esi, edi
  5250 00009481 29D6                <1> 	sub	esi, edx ; - displacement
  5251                              <1> 	
  5252 00009483 FA                  <1> 	cli	; disable interrupts
  5253 00009484 FD                  <1> 	std	; backward
  5254                              <1> 
  5255 00009485 F3A4                <1> 	rep	movsb ; move ECX bytes from DS:ESI to ES:EDI
  5256                              <1> 
  5257 00009487 FC                  <1> 	cld	; forward (default)
  5258 00009488 FB                  <1> 	sti	; enable interrupts
  5259                              <1> 	
  5260 00009489 89C7                <1> 	mov	edi, eax
  5261 0000948B 59                  <1> 	pop	ecx ; ***** ; byte count (after '=')
  5262 0000948C 89CA                <1> 	mov	edx, ecx
  5263 0000948E 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5264 00009490 89FB                <1> 	mov	ebx, edi
  5265                              <1> 
  5266 00009492 F3A4                <1> 	rep	movsb
  5267                              <1> 
  5268 00009494 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5269                              <1> 
  5270 00009496 0FB605[144F0100]    <1> 	movzx	eax, byte [env_var_length]
  5271 0000949D 01C2                <1> 	add	edx, eax ; variable length (total)
  5272 0000949F F7D8                <1> 	neg	eax
  5273 000094A1 01D8                <1> 	add	eax, ebx ; start address of the variable
  5274 000094A3 F8                  <1> 	clc	; 13/04/2016
  5275 000094A4 E99EFEFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5276                              <1> 
  5277                              <1> set_env_change_variable_calc9:
  5278                              <1> 	; 11/04/2016
  5279 000094A9 21D2                <1> 	and	edx, edx ; is empty ?
  5280 000094AB 753B                <1> 	jnz	short set_env_change_variable_calc15
  5281                              <1> 	
  5282 000094AD 0FB6DC              <1> 	movzx	ebx, ah
  5283 000094B0 F7DB                <1> 	neg	ebx
  5284 000094B2 01FB                <1> 	add	ebx, edi
  5285                              <1> 
  5286                              <1> 	; EBX = Start address of the variable (in env page)
  5287                              <1> 	; EDX = Variable length = 0
  5288                              <1> 	
  5289 000094B4 89FE                <1> 	mov	esi, edi
  5290                              <1> 
  5291                              <1> set_env_change_variable_calc10:
  5292 000094B6 AC                  <1> 	lodsb
  5293 000094B7 08C0                <1> 	or	al, al
  5294 000094B9 75FB                <1> 	jnz	short set_env_change_variable_calc10
  5295                              <1> 
  5296 000094BB B9FF310900          <1> 	mov	ecx, Env_Page + Env_Page_Size - 1
  5297                              <1> 
  5298 000094C0 39CE                <1> 	cmp	esi, ecx ; +511 (+4095)
  5299 000094C2 7604                <1> 	jna	short set_env_change_variable_calc11
  5300                              <1> 
  5301 000094C4 89CE                <1> 	mov	esi, ecx
  5302 000094C6 8806                <1> 	mov	[esi], al ; 0
  5303                              <1> 
  5304                              <1> set_env_change_variable_calc11:
  5305 000094C8 89DF                <1> 	mov	edi, ebx ; old variable's start address
  5306                              <1> 
  5307                              <1> set_env_change_variable_calc12:
  5308 000094CA AC                  <1> 	lodsb
  5309 000094CB AA                  <1> 	stosb
  5310 000094CC 20C0                <1> 	and	al, al
  5311 000094CE 75FA                <1> 	jnz	short set_env_change_variable_calc12
  5312 000094D0 39CE                <1> 	cmp	esi, ecx
  5313 000094D2 7706                <1> 	ja	short set_env_change_variable_calc13
  5314 000094D4 AC                  <1> 	lodsb
  5315 000094D5 AA                  <1> 	stosb
  5316 000094D6 20C0                <1> 	and	al, al
  5317 000094D8 75F0                <1> 	jnz	short set_env_change_variable_calc12	
  5318                              <1> 
  5319                              <1> set_env_change_variable_calc13:
  5320 000094DA 29F9                <1> 	sub	ecx, edi
  5321 000094DC 7203                <1> 	jb	short set_env_change_variable_calc14
  5322 000094DE 41                  <1> 	inc	ecx ; 1-512 (1-4096)
  5323 000094DF F3AA                <1> 	rep	stosb ; al = 0	
  5324                              <1> 
  5325                              <1> set_env_change_variable_calc14:
  5326 000094E1 29C0                <1> 	sub	eax, eax ; Start address of the variable
  5327                              <1> 	; EAX = 0 -> Variable is removed
  5328                              <1> 	; EDX = Variable length = 0	
  5329                              <1> 
  5330 000094E3 E95FFEFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5331                              <1> 	    
  5332                              <1> set_env_change_variable_calc15:	
  5333 000094E8 52                  <1> 	push	edx ; *****
  5334 000094E9 F7DA                <1> 	neg	edx
  5335 000094EB 01CA                <1> 	add	edx, ecx ; difference (the old string is longer)
  5336 000094ED 89F3                <1> 	mov 	ebx, esi
  5337 000094EF 89FE                <1> 	mov	esi, edi
  5338                              <1> 
  5339                              <1> set_env_change_variable_calc16:
  5340 000094F1 AC                  <1> 	lodsb 
  5341 000094F2 20C0                <1> 	and	al, al
  5342 000094F4 75FB                <1> 	jnz	short set_env_change_variable_calc16
  5343                              <1> 
  5344 000094F6 B900320900          <1> 	mov	ecx, Env_Page + Env_Page_Size
  5345                              <1> 
  5346 000094FB 39CE                <1> 	cmp	esi, ecx ; +512 (+4096)
  5347 000094FD 7605                <1> 	jna	short set_env_change_variable_calc17
  5348                              <1> 
  5349 000094FF 89CE                <1> 	mov	esi, ecx
  5350 00009501 8846FF              <1> 	mov	[esi-1], al ; 0
  5351                              <1> 
  5352                              <1> set_env_change_variable_calc17:
  5353 00009504 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5354 00009506 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5355                              <1> 
  5356 00009508 AC                  <1> 	lodsb
  5357 00009509 08C0                <1> 	or	al, al
  5358 0000950B 741D                <1> 	jz	short set_env_change_variable_calc20
  5359                              <1> 
  5360                              <1> set_env_change_variable_calc18:
  5361 0000950D AC                  <1> 	lodsb
  5362 0000950E 20C0                <1> 	and	al, al
  5363 00009510 75FB                <1> 	jnz	short set_env_change_variable_calc18
  5364                              <1> 
  5365 00009512 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size
  5366 00009518 720B                <1> 	jb	short set_env_change_variable_calc19
  5367 0000951A 740E                <1> 	je	short set_env_change_variable_calc20
  5368                              <1> 
  5369 0000951C BEFF310900          <1> 	mov	esi, Env_Page + Env_Page_Size - 1
  5370 00009521 8806                <1> 	mov	[esi], al ; 0
  5371 00009523 EB06                <1> 	jmp	short set_env_change_variable_calc21
  5372                              <1> 
  5373                              <1> set_env_change_variable_calc19:
  5374 00009525 AC                  <1> 	lodsb
  5375 00009526 08C0                <1> 	or	al, al
  5376 00009528 75E3                <1> 	jnz	short set_env_change_variable_calc18
  5377                              <1> 
  5378                              <1> set_env_change_variable_calc20:
  5379 0000952A 4E                  <1> 	dec	esi ; address of the second (last) 0 of the 00
  5380                              <1> 
  5381                              <1> set_env_change_variable_calc21:
  5382                              <1> 	; edx = difference (byte count)
  5383                              <1> 	
  5384 0000952B 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5385                              <1> 
  5386 0000952D 89F1                <1> 	mov	ecx, esi 
  5387 0000952F 29F9                <1> 	sub	ecx, edi ; count of bytes to move backward
  5388                              <1> 
  5389 00009531 89FE                <1> 	mov	esi, edi ; next variable's address
  5390 00009533 29D7                <1> 	sub	edi, edx ; (displacement)
  5391                              <1> 	
  5392 00009535 F3A4                <1> 	rep	movsb
  5393                              <1> 
  5394 00009537 880F                <1> 	mov	[edi], cl ; 0 ; 00 ; end of environment variables
  5395                              <1> 
  5396 00009539 89C7                <1> 	mov	edi, eax
  5397 0000953B 5A                  <1> 	pop	edx ; ***** ; byte count (after '=')
  5398 0000953C 89D1                <1> 	mov	ecx, edx
  5399 0000953E 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5400 00009540 89FB                <1> 	mov	ebx, edi
  5401                              <1> 	
  5402 00009542 F3A4                <1> 	rep	movsb
  5403                              <1> 
  5404 00009544 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5405                              <1> 
  5406 00009546 0FB605[144F0100]    <1> 	movzx	eax, byte [env_var_length]
  5407 0000954D 01C2                <1> 	add	edx, eax ; variable length (total)
  5408 0000954F F7D8                <1> 	neg	eax
  5409 00009551 01D8                <1> 	add	eax, ebx ; start address of the variable
  5410 00009553 F8                  <1> 	clc	; 13/04/2016
  5411 00009554 E9EEFDFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5412                              <1> 
  5413                              <1> mainprog_startup_configuration:
  5414                              <1> 	; 06/05/2016
  5415                              <1> 	; 14/04/2016 (TRDOS 386 = TRDOS v2.0)
  5416                              <1> 	; 17/09/2011 (TRDOS v1, MAINPROG.ASM)
  5417                              <1> 	;
  5418                              <1> loc_load_mainprog_cfg_file:
  5419 00009559 BE[29FF0000]        <1> 	mov	esi, MainProgCfgFile
  5420 0000955E 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5421 00009562 E8E8E9FFFF          <1> 	call	find_first_file
  5422 00009567 7256                <1> 	jc	short loc_load_mainprog_cfg_exit
  5423                              <1> 
  5424                              <1> 	;or	eax, eax
  5425                              <1> 	;jz	short loc_load_mainprog_cfg_exit
  5426                              <1> 
  5427                              <1> loc_start_mainprog_configuration:
  5428                              <1> 	; ESI = FindFile_DirEntry Location
  5429                              <1> 	; EAX = File Size
  5430                              <1> 
  5431 00009569 A3[94420100]        <1> 	mov	[MainProgCfg_FileSize], eax
  5432                              <1> 
  5433 0000956E 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  5434 00009572 C1E210              <1> 	shl	edx, 16
  5435 00009575 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  5436 00009579 8915[C84E0100]      <1> 	mov	[csftdf_sf_cluster], edx
  5437                              <1> 
  5438 0000957F 89C1                <1> 	mov	ecx, eax
  5439 00009581 29C0                <1> 	sub	eax, eax
  5440                              <1> 
  5441                              <1> 	; TRDOS 386 (TRDOS v2.0)
  5442                              <1> 	; Allocate contiguous memory block for loading the file
  5443                              <1> 	
  5444                              <1> 	; eax = 0 (Allocate memory from the beginning)
  5445                              <1> 	; ecx = File (Allocation) size in bytes
  5446                              <1> 	
  5447 00009583 E89BBEFFFF          <1> 	call	allocate_memory_block
  5448 00009588 7235                <1> 	jc	short loc_load_mainprog_cfg_exit
  5449                              <1> 
  5450 0000958A A3[C04E0100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  5451 0000958F 890D[C44E0100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  5452                              <1> 
  5453 00009595 31DB                <1> 	xor	ebx, ebx
  5454                              <1> 	;mov	[csftdf_sf_rbytes], ebx ; 0, reset
  5455                              <1> 
  5456 00009597 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv] ; [FindFile_Drv]
  5457 0000959D BE00010900          <1> 	mov	esi, Logical_DOSDisks
  5458 000095A2 01DE                <1> 	add	esi, ebx
  5459                              <1> 
  5460 000095A4 8B1D[C04E0100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  5461                              <1> 
  5462 000095AA 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5463 000095AE 7710                <1>         ja	short loc_mcfg_load_fat_file
  5464                              <1> 
  5465 000095B0 C705[D04E0100]0000- <1> 	mov	dword [csftdf_r_size], 65536
  5465 000095B8 0100                <1>
  5466 000095BA E992010000          <1>         jmp     loc_mcfg_load_fs_file
  5467                              <1> 
  5468                              <1> loc_load_mainprog_cfg_exit:
  5469 000095BF C3                  <1> 	retn 
  5470                              <1> 
  5471                              <1> loc_mcfg_load_fat_file:
  5472 000095C0 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
  5473 000095C4 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  5474 000095C8 F7E1                <1> 	mul	ecx
  5475 000095CA A3[D04E0100]        <1> 	mov	[csftdf_r_size], eax
  5476                              <1> 
  5477                              <1> loc_mcfg_load_fat_file_next:
  5478 000095CF E813010000          <1> 	call	mcfg_read_fat_file_sectors
  5479 000095D4 0F82F7000000        <1>         jc      mcfg_deallocate_mem
  5480                              <1> 
  5481 000095DA 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  5482 000095DC 74F1                <1> 	jz	short loc_mcfg_load_fat_file_next
  5483                              <1> 
  5484                              <1> loc_mcfg_load_fat_file_ok:
  5485                              <1> 	; 06/05/2016
  5486 000095DE C705[644F0100]-     <1> 	mov	dword [mainprog_return_addr], loc_mcfg_ci_return_addr 
  5486 000095E4 [92960000]          <1>
  5487                              <1> 	;
  5488 000095E8 8B35[C04E0100]      <1> 	mov	esi, [csftdf_sf_mem_addr]
  5489 000095EE 8935[98420100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5490                              <1> 	
  5491 000095F4 A1[94420100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5492 000095F9 89C2                <1> 	mov	edx, eax
  5493 000095FB 01F2                <1> 	add	edx, esi
  5494                              <1> 
  5495                              <1> loc_mcfg_process_next_line_check:
  5496 000095FD 89C1                <1> 	mov	ecx, eax
  5497                              <1> 
  5498 000095FF 803E2A              <1> 	cmp	byte [esi], "*" ; Remark sign
  5499 00009602 7503                <1> 	jne	short loc_mcfg_process_next_line
  5500 00009604 46                  <1> 	inc	esi
  5501 00009605 EB17                <1> 	jmp	short loc_move_mainprog_cfg_nl1
  5502                              <1> 
  5503                              <1> loc_mcfg_process_next_line:
  5504 00009607 83F94F              <1> 	cmp	ecx, 79
  5505 0000960A 7605                <1> 	jna	short loc_start_mainprog_cfg_process
  5506                              <1> 	
  5507 0000960C B94F000000          <1> 	mov	ecx, 79 
  5508                              <1> 
  5509                              <1> loc_start_mainprog_cfg_process:
  5510 00009611 BF[56430100]        <1> 	mov	edi, CommandBuffer
  5511                              <1> 
  5512                              <1> loc_move_mainprog_cfg_line:
  5513 00009616 AC                  <1> 	lodsb
  5514 00009617 3C20                <1> 	cmp	al, 20h
  5515 00009619 720C                <1> 	jb	short loc_move_mainprog_cfg_nl2
  5516 0000961B AA                  <1> 	stosb
  5517 0000961C E2F8                <1> 	loop	loc_move_mainprog_cfg_line
  5518                              <1> 
  5519                              <1> loc_move_mainprog_cfg_nl1:
  5520 0000961E 39D6                <1> 	cmp	esi, edx ; + configuration file size
  5521 00009620 7312                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5522 00009622 AC                  <1> 	lodsb
  5523 00009623 3C20                <1> 	cmp	al, 20h
  5524 00009625 73F7                <1> 	jnb	short loc_move_mainprog_cfg_nl1
  5525                              <1> 
  5526                              <1> loc_move_mainprog_cfg_nl2:
  5527 00009627 39D6                <1> 	cmp	esi, edx
  5528 00009629 7309                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5529 0000962B 8A06                <1> 	mov	al, [esi]
  5530 0000962D 3C20                <1> 	cmp	al, 20h
  5531 0000962F 7703                <1>  	ja	short loc_end_of_mainprog_cfg_line
  5532 00009631 46                  <1> 	inc	esi
  5533 00009632 EBF3                <1> 	jmp	short loc_move_mainprog_cfg_nl2	               
  5534                              <1> 
  5535                              <1> loc_end_of_mainprog_cfg_line:
  5536 00009634 C60700              <1> 	mov	byte [edi], 0
  5537                              <1> 
  5538 00009637 8935[98420100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5539                              <1> 	
  5540                              <1> loc_move_mainprog_cfg_command:
  5541 0000963D BE[56430100]        <1> 	mov	esi, CommandBuffer
  5542 00009642 89F7                <1> 	mov	edi, esi
  5543 00009644 31DB                <1> 	xor	ebx, ebx
  5544                              <1> 	;xor	ecx, ecx
  5545 00009646 30C9                <1> 	xor	cl, cl
  5546                              <1> 
  5547                              <1> loc_move_mcfg_first_cmd_char:
  5548 00009648 8A041E              <1> 	mov	al, [esi+ebx]
  5549 0000964B FEC3                <1> 	inc	bl 
  5550 0000964D 3C20                <1> 	cmp	al, 20h
  5551 0000964F 7712                <1> 	ja	short loc_move_mcfg_cmd_capitalizing
  5552 00009651 7237                <1> 	jb	short loc_move_mcfg_cmd_arguments_ok
  5553 00009653 80FB4F              <1> 	cmp	bl, 79
  5554 00009656 72F0                <1> 	jb	short loc_move_mcfg_first_cmd_char
  5555 00009658 EB30                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5556                              <1> 
  5557                              <1> loc_move_mcfg_next_cmd_char:
  5558 0000965A 8A041E              <1> 	mov	al, [esi+ebx]
  5559 0000965D FEC3                <1> 	inc	bl
  5560 0000965F 3C20                <1> 	cmp	al, 20h
  5561 00009661 7614                <1> 	jna	short loc_move_mcfg_cmd_ok
  5562                              <1> 
  5563                              <1> loc_move_mcfg_cmd_capitalizing:
  5564 00009663 3C61                <1> 	cmp	al, 61h ; 'a'
  5565 00009665 7206                <1> 	jb	short loc_move_mcfg_cmd_caps_ok
  5566 00009667 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  5567 00009669 7702                <1> 	ja	short loc_move_mcfg_cmd_caps_ok
  5568 0000966B 24DF                <1> 	and	al, 0DFh ; sub	al, 'a'-'A'
  5569                              <1> 
  5570                              <1> loc_move_mcfg_cmd_caps_ok:
  5571 0000966D AA                  <1> 	stosb 
  5572 0000966E FEC1                <1> 	inc	cl
  5573 00009670 80FB4F              <1> 	cmp	bl, 79
  5574 00009673 72E5                <1> 	jb	short loc_move_mcfg_next_cmd_char
  5575 00009675 EB13                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5576                              <1> 
  5577                              <1> loc_move_mcfg_cmd_ok:
  5578 00009677 30C0                <1> 	xor	al, al ; 0
  5579                              <1> 
  5580                              <1> loc_move_mcfg_cmd_arguments:
  5581 00009679 8807                <1> 	mov	[edi], al
  5582 0000967B 47                  <1> 	inc	edi
  5583 0000967C 80FB4F              <1> 	cmp	bl, 79
  5584 0000967F 7309                <1> 	jnb	short loc_move_mcfg_cmd_arguments_ok
  5585 00009681 8A041E              <1> 	mov	al, [esi+ebx]
  5586 00009684 FEC3                <1> 	inc	bl
  5587 00009686 3C20                <1> 	cmp	al, 20h
  5588 00009688 73EF                <1> 	jnb	short loc_move_mcfg_cmd_arguments
  5589                              <1> 	
  5590                              <1> loc_move_mcfg_cmd_arguments_ok:
  5591 0000968A C60700              <1> 	mov	byte [edi], 0
  5592                              <1>        
  5593                              <1> loc_mcfg_process_cmd_interpreter:
  5594 0000968D E8F4DFFFFF          <1> 	call    command_interpreter
  5595                              <1> 
  5596                              <1> loc_mcfg_ci_return_addr: 
  5597 00009692 A1[94420100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5598 00009697 89C2                <1> 	mov	edx, eax
  5599 00009699 8B35[98420100]      <1> 	mov	esi, [MainProgCfg_LineOffset]
  5600 0000969F 01F2                <1> 	add	edx, esi
  5601 000096A1 0305[C04E0100]      <1> 	add	eax, [csftdf_sf_mem_addr]
  5602 000096A7 29F0                <1> 	sub	eax, esi
  5603 000096A9 0F874EFFFFFF        <1>         ja      loc_mcfg_process_next_line_check
  5604                              <1> 
  5605 000096AF E81D000000          <1> 	call	mcfg_deallocate_mem
  5606                              <1>  
  5607 000096B4 B94F000000          <1>  	mov	ecx, 79 ; 80 ?
  5608 000096B9 BF[56430100]        <1> 	mov	edi, CommandBuffer
  5609 000096BE 30C0                <1> 	xor	al, al
  5610 000096C0 F3AA                <1> 	rep	stosb
  5611                              <1> 
  5612                              <1> 	; 06/05/2016
  5613 000096C2 BE[4F0B0100]        <1> 	mov	esi, nextline
  5614 000096C7 E8F1CBFFFF          <1> 	call	print_msg
  5615 000096CC E92DD6FFFF          <1> 	jmp	dos_prompt
  5616                              <1> 
  5617                              <1> mcfg_deallocate_mem:
  5618 000096D1 A1[C04E0100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  5619 000096D6 8B0D[C44E0100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  5620                              <1> 	;call	deallocate_memory_block
  5621                              <1> 	;retn
  5622 000096DC E943BFFFFF          <1> 	jmp	deallocate_memory_block
  5623                              <1> 
  5624                              <1> mcfg_read_file_sectors:
  5625                              <1> 	; 14/04/2016
  5626 000096E1 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5627 000096E5 7669                <1>         jna	short mcfg_read_fs_file_sectors
  5628                              <1> 
  5629                              <1> mcfg_read_fat_file_sectors:
  5630                              <1> 	; return:
  5631                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  5632                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  5633                              <1> 	;   CF = 1 -> read error (error code in AL)	
  5634                              <1> 
  5635                              <1> mcfg_read_fat_file_secs_0:
  5636 000096E7 8B15[94420100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5637 000096ED 2B15[D84E0100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  5638 000096F3 3B15[D04E0100]      <1> 	cmp	edx, [csftdf_r_size]	
  5639 000096F9 7306                <1> 	jnb	short mcfg_read_fat_file_secs_1
  5640 000096FB 8915[D04E0100]      <1> 	mov	[csftdf_r_size], edx
  5641                              <1> 		
  5642                              <1> mcfg_read_fat_file_secs_1:
  5643 00009701 A1[D04E0100]        <1> 	mov	eax, [csftdf_r_size]
  5644 00009706 29D2                <1> 	sub	edx, edx
  5645 00009708 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  5646 0000970C 01C8                <1> 	add	eax, ecx
  5647 0000970E 48                  <1> 	dec	eax
  5648 0000970F F7F1                <1> 	div	ecx
  5649 00009711 89C1                <1> 	mov	ecx, eax ; sector count
  5650 00009713 A1[C84E0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5651                              <1> 
  5652                              <1> 	; EBX = memory block address (current)
  5653                              <1> 	
  5654 00009718 E88E230000          <1> 	call	read_fat_file_sectors
  5655 0000971D 7230                <1> 	jc	short mcfg_read_fat_file_secs_3
  5656                              <1> 
  5657                              <1> 	; EBX = next memory address
  5658                              <1> 
  5659 0000971F A1[D84E0100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  5660 00009724 0305[D04E0100]      <1> 	add	eax, [csftdf_r_size]
  5661 0000972A 8B15[94420100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5662 00009730 39D0                <1> 	cmp	eax, edx
  5663 00009732 731B                <1> 	jnb	short mcfg_read_fat_file_secs_3 ; edx > 0
  5664 00009734 A3[D84E0100]        <1> 	mov	[csftdf_sf_rbytes], eax
  5665                              <1> 
  5666 00009739 53                  <1> 	push	ebx ; *
  5667                              <1> 	; get next cluster (csftdf_r_size! bytes)
  5668 0000973A A1[C84E0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5669 0000973F E839210000          <1> 	call	get_next_cluster
  5670 00009744 5B                  <1> 	pop	ebx ; *
  5671 00009745 7301                <1> 	jnc	short mcfg_read_fat_file_secs_2
  5672                              <1> 
  5673                              <1> 	;mov	eax, 17; Read error !
  5674 00009747 C3                  <1> 	retn
  5675                              <1> 
  5676                              <1> mcfg_read_fat_file_secs_2:
  5677 00009748 29D2                <1> 	sub	edx, edx ; 0
  5678 0000974A A3[C84E0100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  5679                              <1> 
  5680                              <1> mcfg_read_fat_file_secs_3:
  5681 0000974F C3                  <1> 	retn
  5682                              <1> 
  5683                              <1> mcfg_read_fs_file_sectors:
  5684 00009750 C3                  <1> 	retn
  5685                              <1> 
  5686                              <1> loc_mcfg_load_fs_file:
  5687 00009751 C3                  <1> 	retn
  5688                              <1> 
  5689                              <1> load_and_execute_file:
  5690                              <1> 	; 04/01/2017
  5691                              <1> 	; 06/05/2016, 07/05/2016, 11/05/2016
  5692                              <1> 	; 23/04/2016, 24/04/2016
  5693                              <1> 	; 22/04/2016 (TRDOS 386 = TRDOS v2.0)
  5694                              <1> 	; 05/11/2011 
  5695                              <1> 	; (TRDOS v1, CMDINTR.ASM, 'cmp_cmd_run', 'cmp_cmd_external')
  5696                              <1> 	; ('loc_run_check_filename')
  5697                              <1> 	; 29/08/2011
  5698                              <1> 	; 10/09/2011
  5699                              <1> 	; INPUT->
  5700                              <1> 	;	ESI = Path Name address (CommandBuffer address)
  5701                              <1> 	; OUTPUT ->
  5702                              <1> 	;	none (error message will be shown if an error will occur)
  5703                              <1> 	;
  5704                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI, EBP will be changed) 
  5705                              <1> 	;
  5706                              <1> loc_run_check_filename:
  5707 00009752 803E20              <1> 	cmp	byte [esi], 20h
  5708 00009755 0F82F2E2FFFF        <1> 	jb	loc_cmd_failed
  5709 0000975B 7703                <1> 	ja	short loc_run_check_filename_ok
  5710 0000975D 46                  <1> 	inc	esi
  5711 0000975E EBF2                <1> 	jmp	short loc_run_check_filename
  5712                              <1> 
  5713                              <1> loc_run_check_filename_ok:
  5714 00009760 C605[07430100]00    <1> 	mov	byte [CmdArgStart], 0 ; reset
  5715 00009767 56                  <1> 	push	esi ; *
  5716                              <1> loc_run_get_first_arg_pos:
  5717 00009768 46                  <1> 	inc	esi
  5718 00009769 8A06                <1> 	mov	al, [esi]
  5719 0000976B 3C20                <1> 	cmp	al, 20h
  5720 0000976D 77F9                <1> 	ja	short loc_run_get_first_arg_pos
  5721 0000976F C60600              <1> 	mov	byte [esi], 0
  5722                              <1> loc_run_get_external_arg_pos:
  5723                              <1> 	; 11/05/2016
  5724 00009772 46                  <1> 	inc	esi
  5725 00009773 8A06                <1> 	mov	al, [esi]
  5726 00009775 3C20                <1> 	cmp	al, 20h
  5727 00009777 760C                <1> 	jna	short loc_run_parse_path_name
  5728 00009779 89F0                <1> 	mov	eax, esi
  5729 0000977B 2D[56430100]        <1> 	sub	eax, CommandBuffer
  5730 00009780 A2[07430100]        <1> 	mov	byte [CmdArgStart], al
  5731                              <1> loc_run_parse_path_name:
  5732 00009785 5E                  <1> 	pop	esi ; *
  5733 00009786 BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  5734 0000978B E8D6090000          <1> 	call	parse_path_name
  5735 00009790 0F82B7E2FFFF        <1> 	jc	loc_cmd_failed
  5736                              <1> 
  5737                              <1> loc_run_check_filename_exists:
  5738 00009796 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  5739 0000979B 803E20              <1> 	cmp	byte [esi], 20h
  5740 0000979E 0F86A9E2FFFF        <1> 	jna	loc_cmd_failed
  5741                              <1> 
  5742                              <1> loc_run_check_exe_filename_ext:
  5743 000097A4 E891020000          <1> 	call	check_prg_filename_ext
  5744 000097A9 0F829EE2FFFF        <1> 	jc	loc_cmd_failed
  5745                              <1> 	
  5746                              <1> loc_run_check_exe_filename_ext_ok:
  5747 000097AF 66A3[624F0100]      <1> 	mov	word [EXE_ID], ax
  5748                              <1> 
  5749                              <1> loc_run_drv:
  5750 000097B5 C605[614F0100]00    <1> 	mov	byte [Run_Manual_Path], 0
  5751 000097BC A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster]
  5752 000097C1 A3[5C4F0100]        <1>         mov     [Run_CDirFC], eax
  5753                              <1> 	;
  5754 000097C6 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  5755 000097CC 8835[064B0100]      <1> 	mov	[RUN_CDRV], dh
  5756                              <1> 
  5757 000097D2 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  5758 000097D8 38F2                <1> 	cmp	dl, dh
  5759 000097DA 7412                <1> 	je	short loc_run_change_directory
  5760                              <1>                
  5761 000097DC 8005[614F0100]02    <1> 	add	byte [Run_Manual_Path], 2
  5762                              <1> 
  5763 000097E3 E8D5D3FFFF          <1> 	call	change_current_drive
  5764 000097E8 0F828AE2FFFF        <1> 	jc	loc_run_cmd_failed
  5765                              <1> 
  5766                              <1> loc_run_change_directory:
  5767 000097EE 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  5768 000097F5 7623                <1> 	jna	short loc_run_find_executable_file
  5769                              <1> 
  5770 000097F7 FE05[614F0100]      <1> 	inc	byte [Run_Manual_Path]
  5771                              <1>      
  5772 000097FD FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  5773                              <1> 
  5774 00009803 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  5775 00009808 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  5776 0000980A E843030000          <1> 	call	change_current_directory
  5777 0000980F 0F8263E2FFFF        <1> 	jc	loc_run_cmd_failed
  5778                              <1> 
  5779                              <1> loc_run_change_prompt_dir_string:
  5780 00009815 E858020000          <1> 	call	change_prompt_dir_string
  5781                              <1> 
  5782                              <1> loc_run_find_executable_file:
  5783 0000981A 66C705[604F0100]00- <1> 	mov	word [Run_Auto_Path], 0
  5783 00009822 00                  <1>
  5784                              <1> 
  5785                              <1> loc_run_find_executable_file_next:
  5786 00009823 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  5787                              <1> loc_run_find_program_file_next:
  5788 00009828 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5789 0000982C E81EE7FFFF          <1> 	call	find_first_file
  5790                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  5791                              <1> 	; EDI = Directory Buffer Directory Entry Location
  5792                              <1> 	; EAX = File size
  5793 00009831 0F835C010000        <1> 	jnc	loc_load_and_run_file
  5794                              <1> 	 
  5795 00009837 3C02                <1> 	cmp	al, 2 ; file not found
  5796 00009839 0F8539E2FFFF        <1> 	jne	loc_run_cmd_failed
  5797                              <1> 
  5798 0000983F 66A1[624F0100]      <1> 	mov	ax, word [EXE_ID]
  5799 00009845 80FC2E              <1> 	cmp	ah, '.' ; File name has extension sign
  5800 00009848 7424                <1> 	je	short loc_run_check_auto_path
  5801                              <1> 
  5802 0000984A 08C0                <1> 	or	al, al
  5803 0000984C 7520                <1> 	jnz	short loc_run_check_auto_path
  5804                              <1> 
  5805 0000984E 80FC08              <1> 	cmp	ah, 8 ; count of file name chars
  5806 00009851 771B                <1> 	ja	short loc_run_check_auto_path
  5807                              <1> 
  5808                              <1> loc_run_change_file_ext_to_prg:
  5809 00009853 0FB6DC              <1> 	movzx	ebx, ah ; count of file name chars
  5810 00009856 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  5811 0000985B 01F3                <1> 	add	ebx, esi	
  5812                              <1> 	; 07/05/2016
  5813 0000985D C7032E505247        <1> 	mov	dword [ebx],  '.PRG'
  5814 00009863 66C705[624F0100]50- <1> 	mov	word [EXE_ID], 'P.'
  5814 0000986B 2E                  <1>
  5815 0000986C EBBA                <1> 	jmp	short loc_run_find_program_file_next	
  5816                              <1> 
  5817                              <1> loc_run_check_auto_path:
  5818                              <1> 	; NOTE: /// 07/05/2016 ///
  5819                              <1> 	; If the path is given, value of byte [Run_Manual_Path]
  5820                              <1> 	; will not be ZERO. If so, file searching by using
  5821                              <1> 	; Automatic Path (via 'PATH' environment variable)
  5822                              <1> 	; will not be applicable, because the program file 
  5823                              <1> 	; is already/absolutely not found.
  5824                              <1> 
  5825 0000986E A0[614F0100]        <1> 	mov	al, [Run_Manual_Path]
  5826 00009873 08C0                <1> 	or	al, al
  5827 00009875 0F85D2E1FFFF        <1> 	jnz	loc_cmd_failed
  5828                              <1> 
  5829                              <1> loc_run_check_auto_path_again:
  5830 0000987B 66833D[604F0100]FF  <1> 	cmp	word [Run_Auto_Path], 0FFFFh		 
  5831                              <1> 		; 0FFFFh = Not a valid run path (in ENV block) 
  5832 00009883 0F83C4E1FFFF        <1> 	jnb	loc_cmd_failed
  5833                              <1> 	; xor	al, al 
  5834 00009889 BE[AFFF0000]        <1> 	mov	esi, Cmd_Path ; 'PATH'
  5835 0000988E BF[A6430100]        <1> 	mov	edi, TextBuffer
  5836 00009893 E857F9FFFF          <1> 	call	get_environment_string
  5837 00009898 730E                <1> 	jnc	short loc_run_chk_filename_ext_again
  5838 0000989A 66C705[604F0100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; invalid
  5838 000098A2 FF                  <1>
  5839 000098A3 E9A5E1FFFF          <1> 	jmp	loc_cmd_failed
  5840                              <1> 
  5841                              <1> loc_run_chk_filename_ext_again:
  5842 000098A8 89C1                <1> 	mov	ecx, eax ; string length (with zero tail)
  5843 000098AA 49                  <1> 	dec	ecx ; without zero tail
  5844 000098AB 66A1[624F0100]      <1> 	mov	ax, [EXE_ID]
  5845 000098B1 80FC2E              <1> 	cmp	ah, '.'
  5846 000098B4 740E                <1> 	je	short loc_run_chk_auto_path_pos
  5847                              <1> 	 
  5848                              <1> loc_run_change_file_ext_to_noext_again:
  5849 000098B6 0FB6DC              <1> 	movzx	ebx, ah
  5850 000098B9 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  5851 000098BE 01F3                <1> 	add 	ebx, esi
  5852 000098C0 29C0                <1> 	sub	eax, eax
  5853 000098C2 8903                <1> 	mov	[ebx], eax ; 0 ; erase extension (.PRG)
  5854                              <1> 
  5855                              <1> loc_run_chk_auto_path_pos:
  5856                              <1> 	;movzx	eax,  word [Run_Auto_Path]
  5857 000098C4 66A1[604F0100]      <1> 	mov	ax, [Run_Auto_Path]
  5858 000098CA 39C8                <1> 	cmp	eax, ecx ; ecx = string length (except zero tail)
  5859 000098CC 0F837BE1FFFF        <1> 	jnb	loc_cmd_failed
  5860                              <1> 	;or	eax, eax
  5861 000098D2 6609C0              <1> 	or	ax, ax
  5862 000098D5 7502                <1> 	jnz	short loc_run_auto_path_pos_move
  5863 000098D7 B005                <1> 	mov	al, 5
  5864                              <1> 
  5865                              <1> loc_run_auto_path_pos_move:
  5866 000098D9 89FE                <1> 	mov	esi, edi ; offset TextBuffer
  5867 000098DB 01C6                <1> 	add	esi, eax
  5868                              <1> 
  5869                              <1> loc_run_auto_path_pos_space_loop:
  5870 000098DD AC                  <1> 	lodsb
  5871 000098DE 3C20                <1> 	cmp	al, 20h 
  5872 000098E0 74FB                <1> 	je	short loc_run_auto_path_pos_space_loop
  5873 000098E2 0F8265E1FFFF        <1> 	jb	loc_cmd_failed 
  5874 000098E8 AA                  <1> 	stosb
  5875                              <1> loc_run_auto_path_pos_move_next: 
  5876 000098E9 AC                  <1> 	lodsb
  5877 000098EA 3C3B                <1> 	cmp	al, ';'
  5878 000098EC 7414                <1> 	je	short loc_run_auto_path_pos_move_last_byte
  5879 000098EE 3C20                <1> 	cmp	al, 20h
  5880 000098F0 74F7                <1> 	je	short loc_run_auto_path_pos_move_next
  5881 000098F2 7203                <1> 	jb	short loc_byte_ptr_end_of_path
  5882 000098F4 AA                  <1> 	stosb
  5883 000098F5 EBF2                <1> 	jmp	short loc_run_auto_path_pos_move_next 
  5884                              <1> 
  5885                              <1> loc_byte_ptr_end_of_path: 
  5886 000098F7 66C705[604F0100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; end of path
  5886 000098FF FF                  <1>
  5887 00009900 EB0D                <1> 	jmp	short loc_run_auto_path_move_ok 
  5888                              <1> 
  5889                              <1> loc_run_auto_path_pos_move_last_byte:
  5890 00009902 89F0                <1> 	mov	eax, esi
  5891 00009904 2D[A6430100]        <1> 	sub	eax, TextBuffer 
  5892 00009909 66A3[604F0100]      <1> 	mov	[Run_Auto_Path], ax ; next path position
  5893                              <1> 
  5894                              <1> loc_run_auto_path_move_ok:
  5895 0000990F 4F                  <1> 	dec	edi
  5896 00009910 B02F                <1> 	mov	al, '/'
  5897 00009912 3807                <1> 	cmp	[edi], al
  5898 00009914 7403                <1> 	je	short loc_run_auto_path_move_file_name
  5899 00009916 47                  <1> 	inc	edi
  5900 00009917 8807                <1> 	mov	[edi], al
  5901                              <1> 
  5902                              <1> loc_run_auto_path_move_file_name:
  5903 00009919 47                  <1> 	inc	edi   
  5904 0000991A BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  5905                              <1> 
  5906                              <1> loc_run_auto_path_move_fn_loop:
  5907 0000991F AC                  <1> 	lodsb
  5908 00009920 AA                  <1> 	stosb
  5909 00009921 08C0                <1> 	or	al, al
  5910 00009923 75FA                <1> 	jnz	short loc_run_auto_path_move_fn_loop
  5911                              <1> 
  5912 00009925 BE[A6430100]        <1> 	mov	esi, TextBuffer
  5913 0000992A BF[4A4C0100]        <1> 	mov	edi, FindFile_Drv
  5914 0000992F E832080000          <1> 	call	parse_path_name
  5915 00009934 0F8213E1FFFF        <1> 	jc	loc_cmd_failed
  5916                              <1> 
  5917 0000993A 8A35[A6420100]      <1> 	mov	dh, [Current_Drv]
  5918 00009940 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  5919 00009946 38F2                <1> 	cmp	dl, dh
  5920 00009948 740B                <1> 	je	short loc_run_change_directory_again
  5921                              <1>                
  5922 0000994A E86ED2FFFF          <1> 	call	change_current_drive
  5923 0000994F 0F8223E1FFFF        <1> 	jc	loc_run_cmd_failed
  5924                              <1> 
  5925                              <1> loc_run_change_directory_again:
  5926 00009955 803D[4B4C0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  5927 0000995C 761D                <1> 	jna	short loc_load_executable_cdir_chk_again
  5928                              <1> 
  5929 0000995E FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  5930 00009964 BE[4B4C0100]        <1> 	mov	esi, FindFile_Directory
  5931 00009969 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  5932 0000996B E8E2010000          <1> 	call	change_current_directory
  5933 00009970 0F8202E1FFFF        <1> 	jc	loc_run_cmd_failed
  5934                              <1> 
  5935                              <1> loc_run_chg_prompt_dir_str_again:
  5936 00009976 E8F7000000          <1> 	call	change_prompt_dir_string
  5937                              <1> 
  5938                              <1> loc_load_executable_cdir_chk_again:
  5939 0000997B A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster]
  5940 00009980 3B05[5C4F0100]      <1> 	cmp	eax, [Run_CDirFC]
  5941 00009986 0F8597FEFFFF        <1> 	jne	loc_run_find_executable_file_next
  5942 0000998C 30C0                <1> 	xor	al, al ; 0
  5943 0000998E E9E8FEFFFF          <1> 	jmp	loc_run_check_auto_path_again
  5944                              <1> 
  5945                              <1> loc_load_and_run_file:
  5946                              <1> 	; 04/01/2017
  5947                              <1> 	; 23/04/2016
  5948 00009993 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  5949 00009998 BF[A6430100]        <1> 	mov	edi, TextBuffer
  5950                              <1> 
  5951                              <1>  	; 24/04/2016
  5952 0000999D 31D2                <1> 	xor	edx, edx
  5953 0000999F 668915[E65D0100]    <1> 	mov	word [argc], dx ; 0
  5954 000099A6 8915[285D0100]      <1> 	mov	dword [u.nread], edx ; 0
  5955                              <1> 
  5956                              <1> loc_load_and_run_file_1:
  5957 000099AC AC                  <1> 	lodsb	
  5958 000099AD AA                  <1> 	stosb
  5959 000099AE FF05[285D0100]      <1> 	inc	dword [u.nread]
  5960 000099B4 20C0                <1> 	and	al, al
  5961 000099B6 75F4                <1> 	jnz 	short loc_load_and_run_file_1
  5962                              <1> 	
  5963 000099B8 A0[07430100]        <1> 	mov	al, [CmdArgStart]
  5964 000099BD 20C0                <1> 	and	al, al
  5965 000099BF 7445                <1> 	jz	short loc_load_and_run_file_7
  5966                              <1> 
  5967 000099C1 0FB6F0              <1> 	movzx	esi, al ; 11/05/2016
  5968 000099C4 B950000000          <1> 	mov	ecx, 80
  5969 000099C9 29F1                <1> 	sub	ecx, esi
  5970 000099CB 81C6[56430100]      <1> 	add	esi, CommandBuffer
  5971                              <1> 
  5972 000099D1 66FF05[E65D0100]    <1> 	inc	word [argc] ; 11/05/2016
  5973                              <1> 
  5974                              <1> loc_load_and_run_file_2:
  5975 000099D8 AC                  <1> 	lodsb
  5976 000099D9 3C20                <1> 	cmp	al, 20h
  5977 000099DB 7717                <1> 	ja	short loc_load_and_run_file_5	
  5978 000099DD 721E                <1> 	jb	short loc_load_and_run_file_6
  5979                              <1> 
  5980                              <1> loc_load_and_run_file_3:
  5981 000099DF 803E20              <1> 	cmp	byte [esi], 20h
  5982 000099E2 7707                <1> 	ja	short loc_load_and_run_file_4
  5983 000099E4 7217                <1> 	jb	short loc_load_and_run_file_6
  5984 000099E6 46                  <1> 	inc	esi
  5985 000099E7 E2F6                <1> 	loop	loc_load_and_run_file_3
  5986 000099E9 EB12                <1> 	jmp	short loc_load_and_run_file_6
  5987                              <1> 
  5988                              <1> loc_load_and_run_file_4:
  5989 000099EB 28C0                <1> 	sub	al, al ; 0
  5990 000099ED 66FF05[E65D0100]    <1> 	inc	word [argc]
  5991                              <1> loc_load_and_run_file_5:
  5992 000099F4 AA                  <1> 	stosb
  5993 000099F5 FF05[285D0100]      <1> 	inc	dword [u.nread]
  5994 000099FB E2DB                <1> 	loop	loc_load_and_run_file_2
  5995                              <1> 			
  5996                              <1> loc_load_and_run_file_6:
  5997 000099FD 30C0                <1> 	xor	al, al ; 0
  5998 000099FF AA                  <1> 	stosb
  5999 00009A00 FF05[285D0100]      <1> 	inc	dword [u.nread]
  6000                              <1> loc_load_and_run_file_7:
  6001 00009A06 8807                <1> 	mov 	[edi], al ; 0
  6002 00009A08 66FF05[E65D0100]    <1> 	inc	word [argc] ; 24/04/2016
  6003 00009A0F FF05[285D0100]      <1> 	inc	dword [u.nread] ; 24/04/2016
  6004 00009A15 BE[A6430100]        <1> 	mov	esi, TextBuffer
  6005 00009A1A 8B15[B84C0100]      <1> 	mov	edx, [FindFile_DirEntry+DirEntry_FileSize]
  6006 00009A20 66A1[B04C0100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusHI]
  6007 00009A26 66C1E010            <1> 	shl	ax, 16
  6008 00009A2A 66A1[B64C0100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusLO]
  6009                              <1> 	; EAX = First Cluster number
  6010                              <1> 	; EDX = File Size
  6011                              <1> 	; ESI = Argument list address
  6012                              <1> 	; [argc] = argument count
  6013                              <1> 	; [u.nread] = argument list length
  6014 00009A30 E894450000          <1> 	call	load_and_run_file ; trdosk6.s
  6015                              <1>         ;jc	loc_run_cmd_failed ; 04/01/2017
  6016                              <1> loc_load_and_run_file_8: ; 06/05/2016
  6017 00009A35 E945E9FFFF          <1> 	jmp	loc_file_rw_restore_retn
  6018                              <1> 
  6019                              <1> check_prg_filename_ext:
  6020                              <1> 	; 23/04/2016 (TRDOS 386 = TRDOS v2.0)
  6021                              <1> 	; 10/09/2011 
  6022                              <1> 	; (TRDOS v1, CMDINTR.ASM, 'proc_check_exe_filename_ext')
  6023                              <1> 	; 14/11/2009
  6024                              <1> 	; INPUT -> 
  6025                              <1> 	;	ESI = Dot File Name
  6026                              <1> 	; OUTPUT ->
  6027                              <1> 	;     cf = 0 -> EXE_ID in AL
  6028                              <1> 	;	ESI = Last char + 1 position
  6029                              <1> 	;     cf = 1 -> Invalid executable file name
  6030                              <1> 	;	or no file name extension if AH<=8
  6031                              <1> 	;	AL = Last file name char     
  6032                              <1> 	;     cf = 0 -> AL='P' (PRG), AL=0 (no extension)
  6033                              <1> 	;
  6034                              <1> 	; (Modified registers: EAX, ESI)
  6035                              <1>   
  6036 00009A3A 30E4                <1> 	xor	ah, ah
  6037                              <1> loc_run_check_filename_ext:	
  6038 00009A3C AC                  <1> 	lodsb
  6039 00009A3D 3C21                <1> 	cmp	al, 21h
  6040 00009A3F 7229                <1> 	jb	short loc_check_exe_fn_retn 
  6041 00009A41 FEC4                <1> 	inc	ah
  6042 00009A43 3C2E                <1> 	cmp	al, '.'
  6043 00009A45 75F5                <1> 	jne	short loc_run_check_filename_ext	
  6044                              <1> 		 
  6045                              <1> loc_run_check_filename_ext_dot:
  6046 00009A47 80FC02              <1> 	cmp	ah, 2 ; .??? is not valid
  6047 00009A4A 88C4                <1> 	mov	ah, al ; '.' 
  6048 00009A4C 7219                <1> 	jb	short loc_check_prg_fn_retn
  6049                              <1> 
  6050                              <1> loc_run_check_filename_ext_dot_ok:
  6051 00009A4E AC                  <1> 	lodsb
  6052 00009A4F 24DF                <1> 	and	al, 0DFh 
  6053                              <1> 
  6054                              <1> loc_run_check_filename_ext_prg:
  6055 00009A51 3C50                <1> 	cmp	al, 'P'
  6056 00009A53 7212                <1> 	jb	short loc_check_prg_fn_retn
  6057 00009A55 7711                <1> 	ja	short loc_check_prg_fn_stc
  6058 00009A57 AC                  <1> 	lodsb
  6059 00009A58 24DF                <1> 	and	al, 0DFh 
  6060 00009A5A 3C52                <1> 	cmp	al, 'R'
  6061 00009A5C 750A                <1> 	jne	short loc_check_prg_fn_stc
  6062 00009A5E AC                  <1> 	lodsb
  6063 00009A5F 24DF                <1> 	and	al, 0DFh
  6064 00009A61 3C47                <1> 	cmp	al, 'G'
  6065 00009A63 7503                <1> 	jne	short loc_check_prg_fn_stc
  6066                              <1> 
  6067 00009A65 B050                <1> 	mov	al, 'P'
  6068                              <1> loc_check_prg_fn_retn:
  6069 00009A67 C3                  <1> 	retn
  6070                              <1> 
  6071                              <1> loc_check_prg_fn_stc:
  6072 00009A68 F9                  <1> 	stc
  6073 00009A69 C3                  <1> 	retn
  6074                              <1>  
  6075                              <1> loc_check_exe_fn_retn:
  6076 00009A6A 28C0                <1> 	sub	al, al ; 0
  6077 00009A6C C3                  <1> 	retn
  6078                              <1>               
  6079                              <1> find_and_list_files:
  6080 00009A6D C3                  <1> 	retn
  6081                              <1> set_exec_arguments:
  6082 00009A6E C3                  <1> 	retn
  6083                              <1> delete_fs_directory:
  6084 00009A6F 31C0                <1> 	xor eax, eax
  6085 00009A71 C3                  <1> 	retn
  2307                                  %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: 17/10/2016
     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> ; 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 00009A72 BE[074B0100]        <1> 	mov	esi, PATH_Array
    28                              <1> change_prompt_dir_str: ; 05/10/2016 (call from 'set_working_path')
    29 00009A77 BF[AA420100]        <1> 	mov	edi, Current_Directory
    30 00009A7C 8A25[A4420100]      <1> 	mov	ah, [Current_Dir_Level]
    31 00009A82 E807000000          <1> 	call	set_current_directory_string
    32 00009A87 880D[05430100]      <1> 	mov	[Current_Dir_StrLen], cl
    33                              <1> 
    34 00009A8D 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 00009A8E 57                  <1> 	push    edi
    49 00009A8F 80FC00              <1> 	cmp     ah, 0
    50 00009A92 7652                <1> 	jna	short pass_write_path
    51 00009A94 83C610              <1> 	add	esi, 16
    52 00009A97 89F3                <1> 	mov	ebx, esi
    53                              <1> loc_write_path:
    54 00009A99 B908000000          <1> 	mov	ecx, 8
    55                              <1> path_write_dirname1:
    56 00009A9E AC                  <1> 	lodsb
    57 00009A9F 3C20                <1> 	cmp	al, 20h
    58 00009AA1 7612                <1> 	jna	short pass_write_dirname1
    59 00009AA3 AA                  <1> 	stosb
    60 00009AA4 81FF[04430100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    61 00009AAA 733A                <1> 	jnb	short pass_write_path
    62 00009AAC E2F0                <1> 	loop	path_write_dirname1
    63 00009AAE 803E20              <1> 	cmp	byte [esi], 20h
    64 00009AB1 7624                <1> 	jna	short pass_write_dirname2
    65 00009AB3 EB0A                <1> 	jmp     short loc_put_dot_cont_ext
    66                              <1> pass_write_dirname1:
    67 00009AB5 89DE                <1> 	mov	esi, ebx
    68 00009AB7 83C608              <1> 	add	esi, 8
    69 00009ABA 803E20              <1> 	cmp	byte [esi], 20h
    70 00009ABD 7618                <1> 	jna	short pass_write_dirname2
    71                              <1> loc_put_dot_cont_ext:
    72 00009ABF C6072E              <1> 	mov	byte [edi], "."
    73                              <1> 	;mov	ecx, 3
    74 00009AC2 B103                <1> 	mov	cl, 3
    75                              <1> loc_check_dir_name_ext:
    76 00009AC4 AC                  <1> 	lodsb
    77 00009AC5 47                  <1> 	inc	edi
    78 00009AC6 3C20                <1> 	cmp	al, 20h
    79 00009AC8 760D                <1> 	jna	short pass_write_dirname2
    80 00009ACA 8807                <1> 	mov	[edi], al
    81 00009ACC 81FF[04430100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    82 00009AD2 7312                <1> 	jnb	short pass_write_path
    83 00009AD4 E2EE                <1> 	loop    loc_check_dir_name_ext
    84 00009AD6 47                  <1> 	inc	edi
    85                              <1> pass_write_dirname2:
    86 00009AD7 FECC                <1> 	dec	ah
    87 00009AD9 740B                <1> 	jz      short pass_write_path
    88 00009ADB 83C310              <1> 	add	ebx, 16
    89 00009ADE 89DE                <1> 	mov	esi, ebx
    90 00009AE0 C6072F              <1> 	mov	byte [edi],"/"
    91 00009AE3 47                  <1> 	inc	edi
    92 00009AE4 EBB3                <1> 	jmp	short loc_write_path
    93                              <1> pass_write_path:
    94 00009AE6 C60700              <1> 	mov	byte [edi], 0
    95 00009AE9 47                  <1> 	inc	edi
    96 00009AEA 89F9                <1> 	mov	ecx, edi
    97 00009AEC 5F                  <1> 	pop	edi
    98 00009AED 29F9                <1> 	sub	ecx, edi
    99                              <1> 	; ECX = Current Directory String Length
   100 00009AEF 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 00009AF0 80FA00              <1> 	cmp	dl, 0
   125 00009AF3 7708                <1> 	ja	short loc_get_current_drive_1
   126 00009AF5 8A15[A6420100]      <1> 	mov	dl, [Current_Drv]
   127 00009AFB EB17                <1> 	jmp	short loc_get_current_drive_2
   128                              <1> loc_get_current_drive_1:
   129 00009AFD FECA                <1> 	dec 	dl
   130 00009AFF 3A15[E2FE0000]      <1> 	cmp	dl, [Last_DOS_DiskNo]
   131 00009B05 760D                <1> 	jna	short loc_get_current_drive_2
   132 00009B07 B80F000000          <1> 	mov	eax, 0Fh ; Invalid drive (Drive not ready!)
   133 00009B0C F5                  <1> 	cmc 	; stc
   134 00009B0D C3                  <1> 	retn
   135                              <1> 
   136                              <1> loc_get_current_drive_not_ready_retn:
   137 00009B0E 5E                  <1> 	pop	esi
   138                              <1> 	;mov	eax, 15
   139 00009B0F 66B80F00            <1> 	mov	ax, 15 ; Drive not ready
   140 00009B13 C3                  <1> 	retn  
   141                              <1>  
   142                              <1> loc_get_current_drive_2:
   143 00009B14 31C0                <1> 	xor	eax, eax
   144 00009B16 88D4                <1> 	mov	ah, dl
   145 00009B18 56                  <1> 	push	esi
   146 00009B19 BE00010900          <1> 	mov	esi, Logical_DOSDisks
   147 00009B1E 01C6                <1> 	add	esi, eax
   148 00009B20 8A06                <1> 	mov	al, [esi+LD_Name] 
   149 00009B22 3C41                <1> 	cmp	al, 'A'
   150 00009B24 72E8                <1> 	jb	short loc_get_current_drive_not_ready_retn
   151                              <1> 
   152 00009B26 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   153 00009B29 08E4                <1> 	or	ah, ah
   154 00009B2B 7506                <1> 	jnz	short loc_get_current_drive_3
   155                              <1> 
   156                              <1> 	;xor	ah, ah ; mov ah, 0
   157 00009B2D 8826                <1> 	mov	[esi], ah
   158 00009B2F 31C9                <1> 	xor	ecx, ecx
   159 00009B31 EB1C                <1> 	jmp	short loc_get_current_drive_4
   160                              <1> 
   161                              <1> loc_get_current_drive_3:
   162 00009B33 BF[074B0100]        <1>         mov     edi, PATH_Array
   163 00009B38 57                  <1> 	push	edi
   164 00009B39 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   165 00009B3F B920000000          <1> 	mov	ecx, 32
   166 00009B44 F3A5                <1> 	rep	movsd
   167 00009B46 5E                  <1> 	pop	esi ; Path Array Address
   168 00009B47 5F                  <1> 	pop	edi ; pushed esi (current dir buffer offset) 
   169                              <1> 	;
   170 00009B48 E841FFFFFF          <1> 	call	set_current_directory_string
   171 00009B4D 89FE                <1> 	mov	esi, edi
   172                              <1> 
   173                              <1> loc_get_current_drive_4:
   174 00009B4F 30C0                <1> 	xor	al, al
   175 00009B51 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 -> succesful
   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 00009B52 8825[954B0100]      <1> 	mov	[CD_COMMAND], ah
   200 00009B58 803E2F              <1> 	cmp	byte [esi], '/'
   201 00009B5B 7505                <1> 	jne	short loc_ccd_cdir_level
   202 00009B5D 46                  <1> 	inc	esi
   203 00009B5E 30C0                <1> 	xor	al, al
   204 00009B60 EB05                <1> 	jmp	short loc_ccd_parse_path_name
   205                              <1> loc_ccd_cdir_level:
   206 00009B62 A0[A4420100]        <1> 	mov	al, [Current_Dir_Level]
   207                              <1> loc_ccd_parse_path_name:
   208 00009B67 88C4                <1> 	mov	ah, al
   209 00009B69 BF[074B0100]        <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 00009B6E 0FB6C8              <1> 	movzx	ecx, al
   221 00009B71 FEC1                <1> 	inc	cl
   222 00009B73 C0E104              <1> 	shl	cl, 4
   223 00009B76 01CF                <1> 	add	edi, ecx
   224 00009B78 B107                <1> 	mov	cl, 7
   225 00009B7A 28C1                <1> 	sub	cl, al
   226 00009B7C C0E102              <1> 	shl	cl, 2
   227 00009B7F 89C3                <1> 	mov	ebx, eax
   228 00009B81 31C0                <1> 	xor	eax, eax ; 0
   229 00009B83 F3AB                <1> 	rep	stosd
   230 00009B85 89D8                <1> 	mov	eax, ebx
   231                              <1> 
   232 00009B87 BF[074B0100]        <1> 	mov	edi, PATH_Array
   233                              <1> 
   234 00009B8C 803E20              <1> 	cmp	byte [esi], 20h
   235 00009B8F F5                  <1> 	cmc
   236 00009B90 7305                <1> 	jnc	short pass_ccd_parse_dir_name
   237                              <1> 
   238                              <1> 		; ESI = Path name
   239                              <1> 		; AL = CCD_Level
   240 00009B92 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 00009B97 9C                  <1> 	pushf
   247                              <1> 
   248                              <1> 	;mov	[CCD_Level], al
   249                              <1>         ;mov	[Last_Dir_Level], ah
   250 00009B98 66A3[8B4B0100]      <1> 	mov	[CCD_Level], ax
   251                              <1> 
   252 00009B9E 31DB                <1> 	xor	ebx, ebx
   253 00009BA0 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
   254 00009BA6 BE00010900          <1> 	mov	esi, Logical_DOSDisks
   255 00009BAB 01DE                <1> 	add	esi, ebx
   256                              <1> 
   257 00009BAD 9D                  <1> 	popf 
   258 00009BAE 720A                <1> 	jc	short loc_ccd_bad_path_name_retn
   259                              <1> 
   260 00009BB0 8935[874B0100]      <1> 	mov	[CCD_DriveDT], esi
   261                              <1> 
   262 00009BB6 3C07                <1> 	cmp	al, 7
   263 00009BB8 7209                <1> 	jb	short loc_ccd_load_child_dir
   264                              <1> 
   265                              <1> loc_ccd_bad_path_name_retn:
   266 00009BBA 87F7                <1> 	xchg	esi, edi
   267 00009BBC B813000000          <1> 	mov	eax, 19 ; Bad directory/path name 
   268 00009BC1 F9                  <1> 	stc
   269                              <1> loc_ccd_retn_p:
   270 00009BC2 C3                  <1> 	retn
   271                              <1> 
   272                              <1> loc_ccd_load_child_dir:
   273                              <1> 	; AL = CCD_Level
   274 00009BC3 08C0                <1> 	or	al, al
   275 00009BC5 7468                <1> 	jz	short loc_ccd_load_root_dir
   276                              <1> 
   277 00009BC7 6689C1              <1> 	mov	cx, ax
   278 00009BCA C0E004              <1> 	shl	al, 4
   279 00009BCD 0FB6F0              <1> 	movzx	esi, al
   280 00009BD0 01FE                <1>      	add	esi, edi  ; offset PATH_Array
   281                              <1> 
   282 00009BD2 8B460C              <1> 	mov	eax, [esi+12]
   283 00009BD5 38E9                <1> 	cmp	cl, ch
   284 00009BD7 0F84FA000000        <1>         je      loc_ccd_load_sub_directory
   285 00009BDD A3[A0420100]        <1> 	mov	[Current_Dir_FCluster], eax
   286                              <1> 
   287                              <1> loc_ccd_load_child_dir_next:
   288 00009BE2 83C610              <1> 	add	esi, 16 ; DOS DirEntry Format FileName Address
   289                              <1> 
   290                              <1>  	; Directory attribute : 10h
   291 00009BE5 B010                <1> 	mov	al, 00010000b ; 10h (Attrib AND mask)
   292                              <1> 	;mov	ah, 11001000b ; C8h
   293                              <1> 	; Volume name attribute: 8h
   294 00009BE7 B408                <1> 	mov	ah, 00001000b ; 08h (Attrib NAND, AND --> zero mask)
   295                              <1> 
   296 00009BE9 6631C9              <1> 	xor	cx, cx  
   297 00009BEC E8B5010000          <1> 	call	locate_current_dir_file
   298 00009BF1 7353                <1> 	jnc	short loc_ccd_set_dir_cluster_ptr
   299                              <1> 
   300                              <1> 	 ; 19/02/2016
   301                              <1> 	;mov	edi, [CCD_DriveDT]
   302 00009BF3 8A25[8B4B0100]      <1> 	mov	ah, [CCD_Level]
   303 00009BF9 803D[954B0100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   304 00009C00 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 00009C02 88E1                <1> 	mov	cl, ah
   310 00009C04 50                  <1> 	push	eax
   311 00009C05 E8E3000000          <1> 	call	loc_ccd_save_current_dir
   312 00009C0A 58                  <1> 	pop	eax
   313                              <1> loc_ccd_load_child_dir_err:            
   314 00009C0B 3C03                <1> 	cmp	al, 3	; AL = 2 => File not found error
   315 00009C0D 7202                <1> 	jb	short loc_ccd_path_not_found_retn
   316 00009C0F F9                  <1> 	stc
   317 00009C10 C3                  <1> 	retn
   318                              <1> 
   319                              <1> loc_ccd_path_not_found_retn:
   320 00009C11 B003                <1> 	mov	al, 3	; Path not found
   321 00009C13 C3                  <1> 	retn
   322                              <1> 
   323                              <1> loc_ccd_load_FAT_root_dir:
   324 00009C14 803D[A5420100]02    <1> 	cmp	byte [Current_FATType], 2
   325 00009C1B 776B                <1> 	ja	short loc_ccd_load_FAT32_root_dir
   326                              <1> 
   327                              <1> 	;mov	esi, [CCD_DriveDT]
   328                              <1> 	;push	esi
   329 00009C1D E8B61D0000          <1> 	call	load_FAT_root_directory
   330                              <1> 	;pop	edi ; Dos Drv Description Table
   331                              <1> 
   332 00009C22 89F7                <1> 	mov	edi, esi
   333 00009C24 BE[074B0100]        <1> 	mov	esi, PATH_Array
   334 00009C29 7297                <1> 	jc	short loc_ccd_retn_p
   335                              <1> 
   336 00009C2B 31C0                <1> 	xor	eax, eax
   337 00009C2D EB78                <1>         jmp	short loc_ccd_set_cdfc
   338                              <1> 
   339                              <1> loc_ccd_load_root_dir:
   340 00009C2F 803D[A5420100]01    <1> 	cmp	byte [Current_FATType], 1
   341 00009C36 73DC                <1> 	jnb	short loc_ccd_load_FAT_root_dir
   342                              <1> 
   343                              <1> loc_ccd_load_FS_root_dir:
   344 00009C38 E8621E0000          <1> 	call	load_FS_root_directory
   345 00009C3D EB5C                <1> 	jmp	short pass_ccd_load_FAT_sub_directory
   346                              <1> 
   347                              <1> loc_ccd_load_FS_sub_directory_next:
   348 00009C3F E85C1E0000          <1> 	call	load_FS_sub_directory
   349 00009C44 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 00009C46 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
   354 00009C4A C1E010              <1> 	shl	eax, 16
   355 00009C4D 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
   356                              <1> 
   357 00009C51 8B35[874B0100]      <1> 	mov	esi, [CCD_DriveDT]
   358 00009C57 803D[A5420100]01    <1> 	cmp	byte [Current_FATType], 1
   359 00009C5E 72DF                <1> 	jb	short loc_ccd_load_FS_sub_directory_next
   360                              <1> 	;push	esi
   361 00009C60 E8FE1D0000          <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 00009C65 BE[074B0100]        <1> 	mov	esi, PATH_Array
   367 00009C6A 7264                <1> 	jc	short loc_ccd_retn_c
   368                              <1> 
   369 00009C6C A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
   370                              <1> 
   371 00009C71 FE05[8B4B0100]      <1> 	inc	byte [CCD_Level]
   372 00009C77 0FB61D[8B4B0100]    <1> 	movzx	ebx, byte [CCD_Level]
   373 00009C7E C0E304              <1> 	shl	bl, 4 ; * 16 (<= 128)   
   374 00009C81 01DE                <1> 	add	esi, ebx ; 19/02/2016
   375 00009C83 89460C              <1> 	mov	[esi+12], eax
   376 00009C86 EB1F                <1> 	jmp	short loc_ccd_set_cdfc
   377                              <1> 
   378                              <1> loc_ccd_load_FAT32_root_dir:
   379 00009C88 BE[074B0100]        <1> 	mov	esi, PATH_Array
   380 00009C8D 8B460C              <1> 	mov	eax, [esi+12]
   381 00009C90 8B35[874B0100]      <1> 	mov	esi, [CCD_DriveDT]
   382                              <1>  
   383                              <1> loc_ccd_load_FAT_sub_directory:
   384                              <1> 	;push	esi
   385 00009C96 E8C81D0000          <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 00009C9B BE[074B0100]        <1> 	mov	esi, PATH_Array
   391 00009CA0 722E                <1> 	jc	short loc_ccd_retn_c
   392                              <1> 
   393 00009CA2 A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
   394                              <1> 
   395                              <1> loc_ccd_set_cdfc:
   396 00009CA7 8A0D[8B4B0100]      <1> 	mov	cl, [CCD_Level]
   397 00009CAD 880D[A4420100]      <1> 	mov	[Current_Dir_Level], cl
   398 00009CB3 A3[A0420100]        <1> 	mov	[Current_Dir_FCluster], eax
   399                              <1> 
   400 00009CB8 8A2D[8C4B0100]      <1> 	mov	ch, [Last_Dir_Level]
   401 00009CBE 38E9                <1> 	cmp	cl, ch 
   402 00009CC0 0F821CFFFFFF        <1> 	jb	loc_ccd_load_child_dir_next
   403                              <1> 	
   404 00009CC6 803D[954B0100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   405 00009CCD 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 00009CCF F8                  <1> 	clc
   411                              <1> 
   412                              <1> loc_ccd_retn_c:
   413 00009CD0 8B3D[874B0100]      <1> 	mov	edi, [CCD_DriveDT]
   414 00009CD6 C3                  <1> 	retn
   415                              <1> 
   416                              <1> loc_ccd_load_sub_directory:
   417 00009CD7 8B35[874B0100]      <1> 	mov	esi, [CCD_DriveDT]
   418 00009CDD 803D[A5420100]01    <1> 	cmp	byte [Current_FATType], 1
   419 00009CE4 73B0                <1> 	jnb	short loc_ccd_load_FAT_sub_directory 
   420 00009CE6 E8B51D0000          <1> 	call	load_FS_sub_directory
   421 00009CEB EBAE                <1> 	jmp	short pass_ccd_load_FAT_sub_directory 
   422                              <1> 
   423                              <1> loc_ccd_save_current_dir:
   424 00009CED BE[074B0100]        <1> 	mov	esi, PATH_Array ; 19/02/2016
   425 00009CF2 8B3D[874B0100]      <1> 	mov	edi, [CCD_DriveDT]
   426 00009CF8 57                  <1> 	push	edi
   427 00009CF9 83C77F              <1>         add     edi, LD_CDirLevel
   428 00009CFC 880F                <1> 	mov	[edi], cl
   429 00009CFE 47                  <1> 	inc	edi ; LD_CurrentDirectory 
   430 00009CFF 56                  <1> 	push	esi
   431                              <1> 	;mov	ecx, 32  ; always < 65536 (in this procedure)
   432 00009D00 66B92000            <1> 	mov	cx, 32
   433 00009D04 F3A5                <1> 	rep	movsd
   434                              <1> 	; Current directory has been saved to 
   435                              <1> 	; the DOS drive description table, cdir area !
   436 00009D06 5E                  <1> 	pop	esi  ; PATH_Array
   437 00009D07 5F                  <1> 	pop	edi  ; Dos Drv Description Table
   438                              <1> 
   439 00009D08 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 00009D09 88C4                <1> 	mov	ah, al
   462 00009D0B 66A3[2C4C0100]      <1> 	mov	[PATH_CDLevel], ax
   463                              <1> repeat_ppdn_check_slash:
   464 00009D11 AC                  <1> 	lodsb
   465 00009D12 3C2F                <1> 	cmp	al, '/'
   466 00009D14 74FB                <1> 	je	short repeat_ppdn_check_slash
   467 00009D16 3C21                <1> 	cmp	al, 21h
   468 00009D18 7219                <1> 	jb	short loc_ppdn_retn
   469 00009D1A 57                  <1> 	push	edi
   470                              <1> loc_ppdn_get_dir_name:
   471 00009D1B B90C000000          <1> 	mov	ecx, 12
   472 00009D20 BF[2E4C0100]        <1> 	mov	edi, Dir_File_Name
   473                              <1> repeat_ppdn_get_dir_name:
   474 00009D25 AA                  <1> 	stosb
   475 00009D26 AC                  <1> 	lodsb
   476 00009D27 3C2F                <1> 	cmp	al, '/'
   477 00009D29 740A                <1> 	je	short loc_check_level_dot_conv_dir_name
   478 00009D2B 3C20                <1> 	cmp	al, 20h
   479 00009D2D 7605                <1> 	jna	short loc_ppdn_end_of_path_scan
   480 00009D2F E2F4                <1> 	loop	repeat_ppdn_get_dir_name
   481 00009D31 5F                  <1> 	pop	edi
   482 00009D32 F9                  <1> 	stc
   483                              <1> loc_ppdn_retn:
   484 00009D33 C3                  <1> 	retn
   485                              <1> 
   486                              <1> loc_ppdn_end_of_path_scan:
   487 00009D34 4E                  <1> 	dec	esi
   488                              <1> loc_check_level_dot_conv_dir_name:
   489 00009D35 31C0                <1> 	xor	eax, eax
   490 00009D37 AA                  <1> 	stosb
   491 00009D38 89F3                <1> 	mov	ebx, esi
   492 00009D3A BE[2E4C0100]        <1> 	mov	esi, Dir_File_Name
   493 00009D3F AC                  <1> 	lodsb
   494                              <1> repeat_ppdn_name_check_dot:
   495 00009D40 3C2E                <1> 	cmp	al, '.'
   496 00009D42 7509                <1> 	jne	short loc_ppdn_convert_sub_dir_name
   497                              <1> repeat_ppdn_name_dot_dot:
   498 00009D44 AC                  <1> 	lodsb
   499 00009D45 3C2E                <1> 	cmp	al, '.'
   500 00009D47 743E                <1> 	je	short loc_ppdn_dot_dot
   501 00009D49 3C21                <1> 	cmp	al, 21h
   502 00009D4B 7226                <1> 	jb	short pass_ppdn_convert_sub_dir_name
   503                              <1> loc_ppdn_convert_sub_dir_name:
   504 00009D4D 8A25[2D4C0100]      <1> 	mov	ah, [PATH_Level]
   505 00009D53 80FC07              <1> 	cmp	ah, 7
   506 00009D56 731B                <1> 	jnb	short pass_ppdn_convert_sub_dir_name
   507 00009D58 FEC4                <1> 	inc	ah  
   508 00009D5A 8825[2D4C0100]      <1> 	mov	[PATH_Level], ah
   509 00009D60 BE[2E4C0100]        <1> 	mov	esi, Dir_File_Name
   510                              <1> 	;mov	edi, [PATH_Array_Ptr]
   511 00009D65 B010                <1> 	mov	al, 16
   512 00009D67 F6E4                <1> 	mul	ah
   513 00009D69 8B3C24              <1> 	mov	edi, [esp]
   514                              <1> 	;push	edi 
   515 00009D6C 01C7                <1> 	add	edi, eax
   516 00009D6E E828030000          <1> 	call	convert_file_name
   517                              <1> 	;pop	edi
   518                              <1> pass_ppdn_convert_sub_dir_name:
   519 00009D73 89DE                <1> 	mov	esi, ebx
   520                              <1> repeat_ppdn_check_last_slash:
   521 00009D75 AC                  <1> 	lodsb
   522 00009D76 3C2F                <1> 	cmp	al, '/'
   523 00009D78 74FB                <1> 	je	short repeat_ppdn_check_last_slash
   524 00009D7A 3C21                <1> 	cmp	al, 21h
   525 00009D7C 739D                <1> 	jnb	short loc_ppdn_get_dir_name
   526                              <1> end_of_parse_dir_name:
   527 00009D7E 5F                  <1> 	pop	edi
   528 00009D7F F5                  <1> 	cmc  
   529                              <1> 	;mov	al, [PATH_CDLevel]
   530                              <1> 	;mov	ah, [PATH_Level]
   531 00009D80 66A1[2C4C0100]      <1> 	mov	ax, [PATH_CDLevel]
   532 00009D86 C3                  <1> 	retn
   533                              <1> 
   534                              <1> loc_ppdn_dot_dot:
   535 00009D87 AC                  <1> 	lodsb
   536 00009D88 3C21                <1> 	cmp	al, 21h
   537 00009D8A 73F2                <1> 	jnb	short end_of_parse_dir_name 
   538                              <1> loc_ppdn_dot_dot_prev_level:
   539 00009D8C 66A1[2C4C0100]      <1> 	mov	ax, [PATH_CDLevel]
   540 00009D92 80EC01              <1> 	sub	ah, 1
   541 00009D95 80D400              <1> 	adc	ah, 0
   542 00009D98 38E0                <1> 	cmp	al, ah
   543 00009D9A 7602                <1> 	jna	short pass_ppdn_set_al_to_ah
   544 00009D9C 88E0                <1> 	mov	al, ah
   545                              <1> pass_ppdn_set_al_to_ah:
   546 00009D9E 66A3[2C4C0100]      <1> 	mov	[PATH_CDLevel], ax
   547 00009DA4 EBCD                <1> 	jmp	short pass_ppdn_convert_sub_dir_name
   548                              <1> 
   549                              <1> locate_current_dir_file:
   550                              <1> 	; 14/02/2016
   551                              <1> 	; 13/02/2016
   552                              <1> 	; 10/02/2016
   553                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   554                              <1> 	; 14/08/2010
   555                              <1> 	; 19/09/2009
   556                              <1>         ; 2005
   557                              <1> 	; INPUT ->
   558                              <1> 	;	ESI = DOS DirEntry Format FileName Address
   559                              <1> 	;	AL = Attributes Mask 
   560                              <1> 	;	(<AL AND EntryAttrib> must be equal to AL)
   561                              <1> 	;	AH = Negative Attributes Mask (If AH>0)
   562                              <1> 	;	(<AH AND EntryAttrib> must be ZERO)
   563                              <1> 	;	CH > 0 Find First Free Dir Entry or Deleted Entry
   564                              <1> 	;	CL = 0 -> Return the First Free Dir Entry
   565                              <1> 	;	CL = E5h -> Return the 1st deleted entry
   566                              <1> 	;	CL = FFh -> Return the 1st deleted or free entry
   567                              <1> 	;	CL > 0 and CL <> E5h and CL <> FFh -> Return the first 
   568                              <1> 	;	     proper entry (which fits with Atributes Masks)
   569                              <1> 	;	CX = 0 Find Valid File/Directory/VolumeName
   570                              <1> 	;	? = Any One Char
   571                              <1> 	;	* = Every Chars
   572                              <1> 	; OUTPUT ->
   573                              <1> 	;	EDI = Directory Entry Address (in Directory Buffer)
   574                              <1> 	;	ESI = DOS DirEntry Format FileName Address
   575                              <1> 	;	CF = 0 -> No Error, Proper Entry,
   576                              <1> 	;	DL = Attributes
   577                              <1> 	;	DH = Previous Entry Attr (LongName Check)
   578                              <1> 	;	AL > 0 -> Ambiguous filename wildcard "?" used
   579                              <1> 	;	AH > 0 -> Ambiguous filename wildcard "*" used
   580                              <1> 	;	AX = 0 -> Filename full fits with directory entry
   581                              <1> 	;	CH = The 1st Name Char of Current Dir Entry
   582                              <1> 	;	CF = 1 -> Proper entry not found, Error Code in EAX/AL
   583                              <1> 	;	CL = 0 and CH = 0 -> Free Entry (End Of Dir)
   584                              <1> 	;	CL = 0 and CH = E5h -> Deleted Entry fits with filters
   585                              <1> 	;	CL > 0 -> Entry not found, CH invalid
   586                              <1> 	;	CF = 0 -> 
   587                              <1> 	;	EBX = Current Directory Entry Index/Number (BX)
   588                              <1> 
   589                              <1> 	;mov	word [DirBuff_EntryCounter], 0 ; Zero Based
   590                              <1> 
   591 00009DA6 8935[8F4B0100]      <1> 	mov	[CDLF_FNAddress], esi
   592 00009DAC 66A3[8D4B0100]      <1> 	mov	[CDLF_AttributesMask], ax
   593 00009DB2 66890D[934B0100]    <1> 	mov	[CDLF_DEType], cx
   594                              <1> 
   595 00009DB9 31DB                <1> 	xor	ebx, ebx
   596 00009DBB 881D[A44B0100]      <1> 	mov	[PreviousAttr], bl ; 0  ; 13/02/2016
   597                              <1> 
   598 00009DC1 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
   599 00009DC7 381D[D04A0100]      <1> 	cmp	byte [DirBuff_ValidData], bl ; 0
   600 00009DCD 761D                <1> 	jna	short loc_lcdf_reload_current_dir2
   601 00009DCF 8A1D[CE4A0100]      <1>         mov     bl, [DirBuff_DRV]
   602 00009DD5 80EB41              <1> 	sub	bl, 'A'
   603 00009DD8 38DF                <1> 	cmp	bh, bl
   604 00009DDA 750E                <1> 	jne	short loc_lcdf_reload_current_dir1
   605 00009DDC 8B15[D54A0100]      <1> 	mov	edx, [DirBuff_Cluster]
   606 00009DE2 3B15[A0420100]      <1> 	cmp	edx, [Current_Dir_FCluster]
   607 00009DE8 7412                <1> 	je	short loc_cdir_locatefile_search
   608                              <1> 
   609                              <1> loc_lcdf_reload_current_dir1:
   610 00009DEA 30DB                <1> 	xor	bl, bl
   611                              <1> loc_lcdf_reload_current_dir2:
   612 00009DEC 89DE                <1> 	mov	esi, ebx
   613 00009DEE 81C600010900        <1>         add     esi, Logical_DOSDisks
   614 00009DF4 E872000000          <1> 	call	reload_current_directory 
   615 00009DF9 735B                <1> 	jnc	short loc_locatefile_search_again 
   616 00009DFB C3                  <1> 	retn  
   617                              <1> 
   618                              <1> loc_cdir_locatefile_search:
   619 00009DFC 31DB                <1> 	xor	ebx, ebx
   620 00009DFE E8A5000000          <1> 	call	find_directory_entry
   621 00009E03 7349                <1> 	jnc	short loc_cdir_locate_file_retn
   622                              <1> 
   623                              <1> loc_locatefile_check_stc_reason:
   624 00009E05 08ED                <1> 	or	ch, ch
   625 00009E07 7444                <1> 	jz	short loc_cdir_locate_file_stc_retn
   626                              <1> 
   627                              <1> loc_locatefile_check_next_entryblock:
   628 00009E09 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
   629 00009E0F 28DB                <1> 	sub	bl, bl
   630 00009E11 0FB7F3              <1> 	movzx	esi, bx
   631 00009E14 81C600010900        <1>         add     esi, Logical_DOSDisks
   632                              <1> 
   633 00009E1A 803D[A4420100]00    <1> 	cmp	byte [Current_Dir_Level], 0
   634 00009E21 760A                <1> 	jna	short loc_locatefile_check_FAT_type
   635                              <1>             
   636 00009E23 803D[A5420100]01    <1> 	cmp	byte [Current_FATType], 1
   637 00009E2A 730A                <1> 	jnb	short loc_locatefile_load_subdir_cluster
   638 00009E2C C3                  <1> 	retn  
   639                              <1> 
   640                              <1> loc_locatefile_check_FAT_type:
   641 00009E2D 803D[A5420100]03    <1> 	cmp	byte [Current_FATType], 3
   642 00009E34 7218                <1> 	jb	short loc_cdir_locate_file_retn
   643                              <1> 
   644                              <1> loc_locatefile_load_subdir_cluster:
   645 00009E36 A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
   646 00009E3B E83D1A0000          <1> 	call	get_next_cluster
   647 00009E40 730D                <1> 	jnc	short loc_locatefile_next_cluster
   648 00009E42 09C0                <1> 	or	eax, eax
   649 00009E44 7507                <1> 	jnz	short loc_locatefile_drive_not_ready_read_err
   650 00009E46 F9                  <1> 	stc
   651                              <1> loc_locatefile_file_notfound:
   652 00009E47 B802000000          <1> 	mov	eax, 2 ; File/Directory/VolName not found
   653 00009E4C C3                  <1> 	retn
   654                              <1> 
   655                              <1> loc_locatefile_drive_not_ready_read_err:
   656                              <1> 	;mov	eax, 17 ;Drive not ready or read error
   657                              <1> loc_cdir_locate_file_stc_retn:
   658 00009E4D F5                  <1> 	cmc ;stc
   659                              <1> loc_cdir_locate_file_retn:
   660 00009E4E C3                  <1> 	retn
   661                              <1> 
   662                              <1> loc_locatefile_next_cluster:
   663 00009E4F E80F1C0000          <1> 	call	load_FAT_sub_directory
   664                              <1> 	;jc	short loc_locatefile_drive_not_ready_read_err
   665 00009E54 72F8                <1> 	jc	short loc_cdir_locate_file_retn 
   666                              <1> 
   667                              <1> loc_locatefile_search_again:
   668 00009E56 8B35[8F4B0100]      <1> 	mov	esi, [CDLF_FNAddress] 
   669 00009E5C 66A1[8D4B0100]      <1> 	mov	ax, [CDLF_AttributesMask]
   670 00009E62 668B0D[934B0100]    <1> 	mov	cx, [CDLF_DEType] 
   671 00009E69 EB91                <1> 	jmp	short loc_cdir_locatefile_search
   672                              <1> 
   673                              <1> reload_current_directory:
   674                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   675                              <1> 	; 13/06/2010
   676                              <1> 	; 22/09/2009
   677                              <1>         ;
   678                              <1> 	; INPUT ->
   679                              <1> 	;	ESI = Dos drive description table address
   680                              <1> 	
   681                              <1> 	;mov	al, [esi+LD_FATType]
   682 00009E6B A0[A5420100]        <1> 	mov	al, [Current_FATType]
   683 00009E70 3C02                <1> 	cmp	al, 2
   684 00009E72 7729                <1> 	ja	short loc_reload_FAT_sub_directory
   685 00009E74 8A25[A4420100]      <1> 	mov	ah, [Current_Dir_Level]
   686 00009E7A 08C0                <1> 	or	al, al
   687 00009E7C 740A                <1> 	jz	short loc_reload_FS_directory
   688 00009E7E 08E4                <1> 	or	ah, ah
   689 00009E80 751B                <1> 	jnz	short loc_reload_FAT_sub_directory
   690                              <1> loc_reload_FAT_12_16_root_directory:
   691 00009E82 E8511B0000          <1> 	call	load_FAT_root_directory
   692 00009E87 C3                  <1> 	retn
   693                              <1> loc_reload_FS_directory:
   694 00009E88 20E4                <1> 	and	ah, ah
   695 00009E8A 7506                <1> 	jnz	short loc_reload_FS_sub_directory 
   696                              <1> loc_reload_FS_root_directory: 
   697 00009E8C E80E1C0000          <1> 	call	load_FS_root_directory
   698 00009E91 C3                  <1> 	retn
   699                              <1> loc_reload_FS_sub_directory:
   700 00009E92 A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster]
   701 00009E97 E8041C0000          <1> 	call	load_FS_sub_directory
   702 00009E9C C3                  <1> 	retn 
   703                              <1> loc_reload_FAT_sub_directory:
   704 00009E9D A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster]
   705 00009EA2 E8BC1B0000          <1> 	call	load_FAT_sub_directory
   706 00009EA7 C3                  <1> 	retn
   707                              <1> 
   708                              <1> find_directory_entry:
   709                              <1> 	; 14/02/2016
   710                              <1> 	; 13/02/2016
   711                              <1> 	; 10/02/2016
   712                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   713                              <1> 	; 14/08/2010 (DIR.ASM, "proc_find_direntry")
   714                              <1> 	; 19/09/2009
   715                              <1> 	; 2005
   716                              <1> 	; INPUT ->
   717                              <1> 	;	ESI = Sub Dir or File Name Address
   718                              <1> 	;	AL = Attributes Mask 
   719                              <1> 	;	(<AL AND EntryAttrib> must be equal to AL)
   720                              <1> 	;	AH = Negative Attributes Mask (If AH>0)
   721                              <1> 	;	(<AH AND EntryAttrib> must be ZERO)
   722                              <1> 	;	CH > 0 Find First Free Dir Entry or Deleted Entry
   723                              <1> 	;	CL = 0 -> Return the First Free Dir Entry
   724                              <1> 	;	CL = E5h -> Return the 1st deleted entry
   725                              <1> 	;	CL = FFh -> Return the 1st deleted or free entry
   726                              <1> 	;	CL > 0 and CL <> E5h and CL <> FFh -> Return the first 
   727                              <1> 	;            proper entry (which fits with Atributes Masks)
   728                              <1> 	;	CX = 0 -> Find Valid File/Directory/VolumeName
   729                              <1> 	;	? = Any One Char
   730                              <1> 	;	* = Every Chars
   731                              <1> 	;	EBX = Current Dir Entry (BX)
   732                              <1> 	;
   733                              <1> 	; OUTPUT -> 
   734                              <1> 	;	EDI = Directory Entry Address (in DirectoryBuffer)
   735                              <1> 	;	ESI = Sub Dir or File Name Address
   736                              <1> 	;	CF = 0 -> No Error, Proper Entry,
   737                              <1> 	;	DL = Attributes
   738                              <1> 	;	DH = Previous Entry Attr (LongName Check)
   739                              <1> 	;	AL > 0 -> Ambiguous filename wildcard "?" used
   740                              <1> 	;	AH > 0 -> Ambiguous filename wildcard "*" used
   741                              <1> 	;	AX = 0 -> Filename full fits with directory entry
   742                              <1> 	;	EBX = CurrentDirEntry (BX)
   743                              <1> 	;	CH = The 1st Name Char of Current Dir Entry
   744                              <1> 	;	CF = 1 -> Proper entry not found, Error Code in AX/AL
   745                              <1> 	;	CL = 0 and CH = 0 -> Free Entry (End Of Dir)
   746                              <1> 	;	CL = 0 and CH = E5h -> Deleted Entry fits with filters
   747                              <1> 	;	CL > 0 -> Entry not found, CH invalid
   748                              <1> 	;
   749                              <1> 	; (EAX, EBX, ECX, EDX, EDI, EBP will be changed)	 
   750                              <1> 
   751 00009EA8 663B1D[D34A0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   752 00009EAF 0F8739010000        <1>         ja      loc_ffde_stc_retn_255
   753                              <1> 
   754                              <1> 	;mov    [DirBuff_CurrentEntry], bx  
   755                              <1> 
   756 00009EB5 BF00000800          <1>   	mov	edi, Directory_Buffer
   757 00009EBA 66A3[A04B0100]      <1> 	mov	[FDE_AttrMask], ax
   758                              <1> 
   759 00009EC0 29C0                <1> 	sub	eax, eax
   760                              <1>             
   761                              <1> 	;;mov	[PreviousAttr], al ; 0 ;; 13/02/2016
   762 00009EC2 66A3[A24B0100]      <1> 	mov	[AmbiguousFileName], ax ; 0
   763                              <1> 
   764 00009EC8 6689D8              <1> 	mov	ax, bx
   765 00009ECB 66C1E005            <1> 	shl	ax, 5 ; ; * 32 ; Directory entry size
   766 00009ECF 01C7                <1> 	add     edi, eax
   767                              <1> 
   768 00009ED1 08ED                <1> 	or	ch, ch
   769 00009ED3 0F852C010000        <1>         jnz     loc_find_free_deleted_entry_0
   770                              <1> 
   771 00009ED9 08C9                <1> 	or      cl, cl
   772 00009EDB 0F850D010000        <1>         jnz     loc_ffde_stc_retn_255
   773                              <1>  
   774                              <1> check_find_dir_entry:
   775 00009EE1 66A1[A04B0100]      <1> 	mov	ax, [FDE_AttrMask]
   776 00009EE7 8A2F                <1> 	mov	ch, [edi]
   777 00009EE9 80FD00              <1> 	cmp     ch, 0 ; Is it never used entry?
   778 00009EEC 0F86FF000000        <1> 	jna	loc_find_direntry_stc_retn 
   779 00009EF2 56                  <1> 	push	esi
   780 00009EF3 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   781 00009EF6 80FDE5              <1> 	cmp	ch, 0E5h ; Is it a deleted file?
   782 00009EF9 746D                <1> 	je	short loc_find_dir_next_entry_prevdeleted
   783                              <1> 
   784 00009EFB 80FA0F              <1> 	cmp     dl, 0Fh ; longname sub component check
   785 00009EFE 7505                <1> 	jne     short loc_check_attributes_mask
   786 00009F00 E8ED010000          <1> 	call	save_longname_sub_component
   787                              <1> 
   788                              <1> loc_check_attributes_mask:
   789 00009F05 88C6                <1> 	mov	dh, al
   790 00009F07 20D6                <1> 	and	dh, dl    
   791 00009F09 38F0                <1> 	cmp	al, dh
   792 00009F0B 0F85BA000000        <1>         jne     loc_find_dir_next_entry
   793 00009F11 20D4                <1> 	and	ah, dl
   794 00009F13 0F85B2000000        <1>         jnz     loc_find_dir_next_entry
   795 00009F19 80FA0F              <1> 	cmp	dl, 0Fh
   796 00009F1C 751A                <1> 	jne	short pass_direntry_attr_check
   797                              <1> 
   798 00009F1E 3C0F                <1> 	cmp	al, 0Fh ; AL = 0Fh -> find long name
   799 00009F20 0F85A5000000        <1>         jne     loc_find_dir_next_entry
   800                              <1> 
   801 00009F26 5E                  <1> 	pop	esi
   802 00009F27 6631C0              <1> 	xor	ax, ax
   803 00009F2A 8A35[A44B0100]      <1> 	mov	dh, [PreviousAttr]
   804 00009F30 66891D[D14A0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   805 00009F37 C3                  <1> 	retn
   806                              <1> 
   807                              <1> pass_direntry_attr_check:
   808 00009F38 89FD                <1> 	mov	ebp, edi ; 14/02/2016
   809 00009F3A B908000000          <1> 	mov	ecx, 8
   810                              <1> loc_lodsb_find_dir:
   811 00009F3F AC                  <1> 	lodsb
   812 00009F40 3C2A                <1> 	cmp	al, '*'
   813 00009F42 7508                <1> 	jne	short pass_fde_ambiguous1_check
   814 00009F44 FE05[A34B0100]      <1>         inc     byte [AmbiguousFileName+1]
   815 00009F4A EB28                <1> 	jmp	short loc_check_direntry_extension
   816                              <1> 
   817                              <1> pass_fde_ambiguous1_check:
   818 00009F4C 3C3F                <1> 	cmp	al, '?'
   819 00009F4E 750D                <1> 	jne	short pass_fde_ambiguous2_check
   820 00009F50 FE05[A24B0100]      <1> 	inc	byte [AmbiguousFileName]
   821 00009F56 803F20              <1> 	cmp	byte [edi], 20h
   822 00009F59 764E                <1> 	jna	short loc_find_dir_next_entry_ebp
   823 00009F5B EB14                <1> 	jmp	short loc_scasb_find_dir_inc_di
   824                              <1> 
   825                              <1> pass_fde_ambiguous2_check:
   826 00009F5D 3C20                <1> 	cmp	al, 20h
   827 00009F5F 750C                <1> 	jne	short loc_scasb_find_dir
   828 00009F61 803F20              <1> 	cmp	byte [edi], 20h
   829 00009F64 7543                <1> 	jne	short loc_find_dir_next_entry_ebp
   830 00009F66 EB0C                <1> 	jmp	short loc_check_direntry_extension
   831                              <1> 
   832                              <1> loc_find_dir_next_entry_prevdeleted:
   833 00009F68 80CA80              <1> 	or	dl, 80h  ; Bit 7 -> deleted entry sign
   834 00009F6B EB5E                <1> 	jmp	short loc_find_dir_next_entry
   835                              <1> 
   836                              <1> loc_scasb_find_dir:
   837 00009F6D 3A07                <1> 	cmp	al, [edi]
   838 00009F6F 7538                <1> 	jne	short loc_find_dir_next_entry_ebp
   839                              <1> loc_scasb_find_dir_inc_di:
   840 00009F71 47                  <1> 	inc	edi
   841 00009F72 E2CB                <1> 	loop	loc_lodsb_find_dir
   842                              <1> 
   843                              <1> loc_check_direntry_extension:
   844 00009F74 BE08000000          <1> 	mov	esi, 8
   845 00009F79 89F7                <1> 	mov	edi, esi ; 8
   846 00009F7B 033424              <1> 	add	esi, [esp] ; Sub Dir or File Name Address
   847 00009F7E 01EF                <1> 	add	edi, ebp
   848 00009F80 B103                <1> 	mov	cl, 3
   849                              <1> loc_lodsb_find_dir_ext:
   850 00009F82 AC                  <1> 	lodsb
   851 00009F83 3C2A                <1> 	cmp	al, '*'
   852 00009F85 7508                <1> 	jne	short pass_fde_ambiguous3_check
   853 00009F87 FE05[A34B0100]      <1> 	inc	byte [AmbiguousFileName+1]
   854 00009F8D EB1E                <1> 	jmp	short loc_find_dir_proper_direntry
   855                              <1> 
   856                              <1> pass_fde_ambiguous3_check:
   857 00009F8F 3C3F                <1> 	cmp	al, '?'
   858 00009F91 750D                <1> 	jne	short pass_fde_ambiguous4_check
   859 00009F93 FE05[A24B0100]      <1> 	inc	byte [AmbiguousFileName]
   860 00009F99 803F20              <1> 	cmp	byte [edi], 20h
   861 00009F9C 760B                <1> 	jna	short loc_find_dir_next_entry_ebp
   862 00009F9E EB49                <1> 	jmp	short loc_scasb_find_dir_ext_inc_di
   863                              <1> 
   864                              <1> pass_fde_ambiguous4_check:
   865 00009FA0 3C20                <1> 	cmp	al, 20h
   866 00009FA2 7541                <1> 	jne	short loc_scasb_find_dir_ext
   867 00009FA4 803F20              <1> 	cmp	byte [edi], 20h
   868 00009FA7 7404                <1> 	je	short loc_find_dir_proper_direntry
   869                              <1> 
   870                              <1> loc_find_dir_next_entry_ebp:
   871 00009FA9 89EF                <1> 	mov	edi, ebp ; 14/02/2016
   872 00009FAB EB1E                <1> 	jmp	short loc_find_dir_next_entry
   873                              <1> 
   874                              <1> loc_find_dir_proper_direntry:
   875 00009FAD 30C9                <1> 	xor	cl, cl
   876                              <1> loc_find_dir_proper_direntry_1:
   877 00009FAF 5E                  <1> 	pop	esi
   878 00009FB0 89EF                <1>         mov     edi, ebp
   879 00009FB2 8A2F                <1> 	mov	ch, [edi]
   880 00009FB4 8A570B              <1> 	mov     dl, [edi+0Bh] ; Dir entry attributes
   881 00009FB7 66A1[A24B0100]      <1> 	mov	ax, [AmbiguousFileName]
   882                              <1> loc_find_dir_proper_direntry_2:
   883 00009FBD 8A35[A44B0100]      <1> 	mov     dh, [PreviousAttr]
   884 00009FC3 66891D[D14A0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   885 00009FCA C3                  <1> 	retn
   886                              <1> 
   887                              <1> loc_find_dir_next_entry:
   888 00009FCB 8815[A44B0100]      <1> 	mov	byte [PreviousAttr], dl ; LongName check
   889                              <1> loc_find_dir_next_entry_1:
   890 00009FD1 5E                  <1> 	pop	esi
   891 00009FD2 83C720              <1> 	add	edi, 32
   892                              <1> 	;inc	word [DirBuff_EntryCounter]
   893 00009FD5 6643                <1> 	inc	bx
   894 00009FD7 663B1D[D34A0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   895 00009FDE 770E                <1> 	ja	short loc_ffde_stc_retn_255
   896 00009FE0 E9FCFEFFFF          <1>         jmp     check_find_dir_entry 
   897                              <1> 
   898                              <1> loc_scasb_find_dir_ext:
   899 00009FE5 3A07                <1> 	cmp	al, [edi]
   900 00009FE7 75C0                <1> 	jne	short loc_find_dir_next_entry_ebp
   901                              <1> loc_scasb_find_dir_ext_inc_di:
   902 00009FE9 47                  <1> 	inc	edi
   903 00009FEA E296                <1> 	loop    loc_lodsb_find_dir_ext
   904 00009FEC EBC1                <1> 	jmp	short loc_find_dir_proper_direntry_1
   905                              <1> 
   906                              <1> loc_ffde_stc_retn_255:
   907                              <1> 	;mov	cx, 0FFFFh
   908 00009FEE 31C9                <1> 	xor	ecx, ecx
   909 00009FF0 49                  <1> 	dec	ecx ; 0FFFFFFFFh
   910                              <1> 	;xor	eax, eax
   911                              <1> loc_find_direntry_stc_retn:
   912                              <1> loc_check_ffde_retn_1:
   913                              <1> 	;mov	ax, 2
   914 00009FF1 B802000000          <1> 	mov	eax, 2 ; File Not Found
   915 00009FF6 8A35[A44B0100]      <1> 	mov	dh, [PreviousAttr]
   916 00009FFC 66891D[D14A0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   917 0000A003 F9                  <1> 	stc
   918 0000A004 C3                  <1> 	retn
   919                              <1> 
   920                              <1> loc_find_free_deleted_entry_0:
   921 0000A005 66A1[A04B0100]      <1> 	mov	ax, [FDE_AttrMask]
   922 0000A00B 8A2F                <1> 	mov	ch, [edi]
   923 0000A00D 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   924 0000A010 08C9                <1> 	or	cl, cl 
   925 0000A012 7407                <1> 	jz	short loc_check_ffde_0_repeat
   926                              <1> 	;cmp	cl, 0E5h
   927                              <1> 	;je	short pass_loc_check_ffde_0_err
   928 0000A014 80F9FF              <1> 	cmp	cl, 0FFh
   929 0000A017 7432                <1> 	je	short loc_find_free_deleted_entry_1
   930 0000A019 EB4D                <1> 	jmp	short pass_loc_check_ffde_0_err
   931                              <1> 
   932                              <1> loc_check_ffde_0_repeat:
   933 0000A01B 08ED                <1> 	or	ch, ch
   934 0000A01D 7511                <1> 	jnz	short loc_check_ffde_0_next
   935                              <1> 
   936                              <1> loc_check_ffde_retn_2:
   937 0000A01F 6629C0              <1> 	sub	ax, ax
   938 0000A022 8A35[A44B0100]      <1> 	mov	dh, [PreviousAttr]
   939 0000A028 66891D[D14A0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   940 0000A02F C3                  <1> 	retn
   941                              <1>  
   942                              <1> loc_check_ffde_0_next:
   943 0000A030 6643                <1> 	inc	bx
   944 0000A032 83C720              <1> 	add	edi, 32
   945                              <1> 	;inc	word [DirBuff_EntryCounter]
   946                              <1> 	 
   947 0000A035 663B1D[D34A0100]    <1>         cmp	bx, [DirBuff_LastEntry]
   948 0000A03C 77B0                <1> 	ja	short loc_ffde_stc_retn_255
   949 0000A03E 8815[A44B0100]      <1> 	mov	[PreviousAttr], dl
   950 0000A044 8A2F                <1> 	mov	ch, [edi]
   951 0000A046 8A570B              <1> 	mov	dl, [edi+0Bh] ; file attributes
   952 0000A049 EBD0                <1> 	jmp	short loc_check_ffde_0_repeat
   953                              <1> 
   954                              <1> loc_find_free_deleted_entry_1:
   955 0000A04B 28D2                <1> 	sub	dl, dl      
   956                              <1> loc_find_free_deleted_entry_2:
   957 0000A04D 20ED                <1> 	and	ch, ch  
   958 0000A04F 74CE                <1> 	jz	short loc_check_ffde_retn_2
   959 0000A051 80FDE5              <1> 	cmp	ch, 0E5h
   960 0000A054 74C9                <1> 	je	short loc_check_ffde_retn_2
   961 0000A056 6643                <1> 	inc	bx
   962 0000A058 83C720              <1> 	add	edi, 32
   963 0000A05B 663B1D[D34A0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   964 0000A062 778A                <1> 	ja	short loc_ffde_stc_retn_255
   965 0000A064 8A2F                <1> 	mov	ch, [edi]
   966 0000A066 EBE5                <1> 	jmp	short loc_find_free_deleted_entry_2
   967                              <1> 
   968                              <1> pass_loc_check_ffde_0_err:
   969 0000A068 38CD                <1> 	cmp	ch, cl
   970 0000A06A 741F                <1> 	je	short loc_check_ffde_attrib 
   971                              <1> 
   972 0000A06C 6643                <1> 	inc	bx
   973 0000A06E 83C720              <1> 	add	edi, 32
   974 0000A071 663B1D[D34A0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   975 0000A078 0F8770FFFFFF        <1>         ja      loc_ffde_stc_retn_255
   976 0000A07E 8815[A44B0100]      <1> 	mov	[PreviousAttr], dl
   977 0000A084 8A2F                <1> 	mov	ch, [edi]
   978 0000A086 8A570B              <1> 	mov	dl, [edi+0Bh]
   979 0000A089 EBDD                <1> 	jmp	short pass_loc_check_ffde_0_err
   980                              <1> 
   981                              <1> loc_check_ffde_attrib:
   982 0000A08B 88C6                <1> 	mov	dh, al
   983 0000A08D 20D6                <1> 	and	dh, dl    
   984 0000A08F 38F0                <1> 	cmp	al, dh
   985 0000A091 759D                <1> 	jne	short loc_check_ffde_0_next
   986 0000A093 20D4                <1> 	and	ah, dl
   987 0000A095 7599                <1> 	jnz	short loc_check_ffde_0_next
   988 0000A097 30C9                <1> 	xor	cl, cl 
   989 0000A099 EB84                <1>         jmp     loc_check_ffde_retn_2
   990                              <1> 
   991                              <1> convert_file_name:
   992                              <1> 	; 06/03/2016
   993                              <1> 	; 11/02/2016
   994                              <1> 	; 07/02/2016 (TRDOS 386 = TRDOS v2.0)
   995                              <1> 	; 06/10/2009
   996                              <1> 	; 2005
   997                              <1> 	;
   998                              <1> 	; INPUT  ->
   999                              <1> 	;	ESI = Dot File Name Location
  1000                              <1> 	;	EDI = Dir Entry Format File Name Location
  1001                              <1> 	; OUTPUT ->
  1002                              <1> 	;	EDI = Dir Entry Format File Name Location
  1003                              <1> 	;	ESI = Dot File Name Location (capitalized)
  1004                              <1> 	;
  1005                              <1> 	; (ECX, AL will be changed) 
  1006                              <1>      
  1007 0000A09B 56                  <1> 	push	esi  
  1008 0000A09C 57                  <1> 	push	edi
  1009                              <1> 
  1010 0000A09D B90B000000          <1> 	mov	ecx, 11
  1011 0000A0A2 B020                <1> 	mov	al, 20h
  1012 0000A0A4 F3AA                <1> 	rep	stosb
  1013                              <1> 
  1014 0000A0A6 8B3C24              <1> 	mov	edi, [esp]
  1015                              <1> 
  1016 0000A0A9 B10C                <1> 	mov	cl, 12 ; file name length (max.)
  1017                              <1> 	; 06/03/2016
  1018                              <1> 	; Directory entry name limit (11 bytes) check for
  1019                              <1> 	; 'rename_directory_entry' procedure.
  1020                              <1> 	; (EDI points to Directory Entry)
  1021                              <1> 	; (If the file name would not contain a dot
  1022                              <1> 	; and file name length would be 12, this would cause to
  1023                              <1> 	; overwrite the attributes byte of the directory entry.)
  1024                              <1> 	;
  1025 0000A0AB B50B                <1> 	mov	ch, 11 ; directory entry's name length
  1026                              <1> loc_check_first_dot:
  1027 0000A0AD 8A06                <1> 	mov	al, [esi]
  1028 0000A0AF 3C2E                <1> 	cmp	al, 2Eh
  1029 0000A0B1 750C                <1> 	jne	short pass_check_first_dot
  1030 0000A0B3 8807                <1> 	mov	[edi], al
  1031 0000A0B5 47                  <1> 	inc	edi
  1032 0000A0B6 46                  <1> 	inc	esi
  1033 0000A0B7 FEC9                <1> 	dec	cl
  1034 0000A0B9 75F2                <1> 	jnz	short loc_check_first_dot
  1035                              <1> 	;;(ecx <= 12)
  1036                              <1> 	;;loop	loc_check_first_dot 
  1037 0000A0BB EB30                <1> 	jmp	short stop_convert_file
  1038                              <1> 
  1039                              <1> loc_get_fchar:
  1040 0000A0BD 8A06                <1> 	mov	al, [esi]
  1041                              <1> pass_check_first_dot:
  1042 0000A0BF 3C61                <1> 	cmp	al, 61h ; 'a'
  1043 0000A0C1 7208                <1> 	jb	short pass_name_capitalize
  1044 0000A0C3 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  1045 0000A0C5 7704                <1> 	ja	short pass_name_capitalize
  1046 0000A0C7 24DF                <1> 	and	al, 0DFh
  1047 0000A0C9 8806                <1> 	mov	[esi], al
  1048                              <1> pass_name_capitalize:
  1049 0000A0CB 3C21                <1> 	cmp	al, 21h
  1050 0000A0CD 721E                <1> 	jb	short stop_convert_file
  1051 0000A0CF 3C2E                <1> 	cmp	al, 2Eh ; '.'
  1052 0000A0D1 750C                <1> 	jne	short pass_dot_space
  1053                              <1> add_dot_space: 
  1054 0000A0D3 80F904              <1> 	cmp	cl, 4
  1055 0000A0D6 760E                <1> 	jna	short inc_and_loop
  1056 0000A0D8 47                  <1> 	inc	edi
  1057 0000A0D9 FECD                <1> 	dec	ch ; 06/03/2016
  1058 0000A0DB FEC9                <1> 	dec	cl
  1059 0000A0DD EBF4                <1> 	jmp	short add_dot_space
  1060                              <1> 	
  1061                              <1> 	;mov	al, 4
  1062                              <1> 	;cmp	cl, al
  1063                              <1> 	;jna	short inc_and_loop
  1064                              <1> 	;sub	cl, al
  1065                              <1> 	;add	edi, ecx
  1066                              <1> 	;mov	cl, al
  1067                              <1> 	;jmp	short inc_and_loop	
  1068                              <1> 
  1069                              <1> pass_dot_space:
  1070 0000A0DF 8807                <1> 	mov	[edi], al
  1071                              <1> loc_after_double_dot:
  1072                              <1> 	; 06/03/2016
  1073 0000A0E1 FECD                <1> 	dec	ch ; count down for 11 bytes dir entry limit
  1074 0000A0E3 740A                <1> 	jz	short stop_convert_file_x
  1075 0000A0E5 47                  <1> 	inc	edi
  1076                              <1> inc_and_loop:
  1077 0000A0E6 FEC9                <1> 	dec	cl ; count down for 12 bytes filename limit 
  1078 0000A0E8 7403                <1> 	jz	short stop_convert_file	
  1079 0000A0EA 46                  <1> 	inc	esi
  1080                              <1> 	;;(ecx <= 12)
  1081                              <1> 	;;loop	loc_get_fchar
  1082 0000A0EB EBD0                <1> 	jmp	short loc_get_fchar
  1083                              <1> 
  1084                              <1> stop_convert_file:
  1085                              <1> 	; 06/03/2016
  1086 0000A0ED 30ED                <1> 	xor	ch, ch
  1087                              <1> 	; ECX < 256 ; 'find_first_file' -> xor cl, cl
  1088                              <1> stop_convert_file_x:
  1089 0000A0EF 5F                  <1> 	pop	edi
  1090 0000A0F0 5E                  <1> 	pop	esi
  1091 0000A0F1 C3                  <1> 	retn
  1092                              <1>  
  1093                              <1> save_longname_sub_component:
  1094                              <1> 	; 13/02/2016
  1095                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
  1096                              <1> 	; 28/02/2010
  1097                              <1> 	; 17/10/2009
  1098                              <1> 	; INPUT ->
  1099                              <1> 	;	EDI = Directory Entry    
  1100                              <1> 	;     	// This procedure is called
  1101                              <1> 	;	// from 'find_directory_entry' procedure.
  1102                              <1> 	;	// If the last entry returns with
  1103                              <1> 	;	// a non-zero LongnameFound value and
  1104                              <1> 	;	// if LFN_CheckSum value is equal to
  1105                              <1> 	;	// the next shortname checksum,
  1106                              <1> 	;	// long name is valid.
  1107                              <1> 	;	// If a longname is longer than 65 bytes,
  1108                              <1> 	;	// it is invalid for trdos. (>45h)
  1109                              <1>  
  1110 0000A0F2 57                  <1> 	push	edi
  1111 0000A0F3 56                  <1> 	push	esi
  1112                              <1> 	;push	ebx
  1113                              <1> 	;push	ecx
  1114                              <1> 	;push	edx
  1115 0000A0F4 50                  <1> 	push	eax
  1116                              <1>            
  1117 0000A0F5 29C9                <1> 	sub	ecx, ecx
  1118                              <1> 	;sub	eax, eax
  1119 0000A0F7 B11A                <1> 	mov	cl, 26
  1120                              <1> 
  1121 0000A0F9 0FB607              <1> 	movzx	eax, byte [edi] ; LDIR_Order
  1122 0000A0FC 3C41                <1> 	cmp	al, 41h  ; 40h (last long entry sign) + 1
  1123 0000A0FE 722B                <1> 	jb	short pass_pslnsc_last_long_entry
  1124                              <1> 
  1125 0000A100 88C4                <1> 	mov	ah, al
  1126 0000A102 80EC40              <1> 	sub	ah, 40h
  1127 0000A105 8825[A64B0100]      <1> 	mov	[LFN_EntryLength], ah
  1128                              <1> 	
  1129 0000A10B 3C45                <1> 	cmp	al, 45h  ; 40h (last long entry sign) + 5
  1130                              <1>  		; Max 130 byte length is usable in TRDOS
  1131                              <1> ; 26*5 = 130
  1132 0000A10D 7753                <1> 	ja	short loc_pslnsc_retn
  1133                              <1> 
  1134 0000A10F 2407                <1> 	and	al, 07h ; 0Fh
  1135 0000A111 A2[A54B0100]        <1> 	mov	[LongNameFound], al
  1136                              <1> 
  1137 0000A116 FEC8                <1> 	dec	al
  1138                              <1> 	;mov	cl, 26
  1139 0000A118 F6E1                <1> 	mul	cl
  1140                              <1> 
  1141 0000A11A 89C6                <1> 	mov	esi, eax
  1142 0000A11C 01CE                <1> 	add	esi, ecx
  1143                              <1> 		; to make is an ASCIZZ string
  1144                              <1> 		; with ax+26 bytes length
  1145 0000A11E 81C6[A84B0100]      <1> 	add	esi, LongFileName
  1146 0000A124 66C7060000          <1> 	mov	word [esi], 0   
  1147 0000A129 EB16                <1> 	jmp	short loc_pslsc_move_ldir_name2 
  1148                              <1> 
  1149                              <1> pass_pslnsc_last_long_entry:
  1150 0000A12B 3C04                <1> 	cmp	al, 04h
  1151 0000A12D 7733                <1> 	ja	short loc_pslnsc_retn
  1152 0000A12F FE0D[A54B0100]      <1> 	dec	byte [LongNameFound]
  1153 0000A135 3A05[A54B0100]      <1> 	cmp	al, [LongNameFound]
  1154 0000A13B 7525                <1> 	jne	short loc_pslnsc_retn
  1155                              <1> 
  1156                              <1> loc_pslsc_move_ldir_name1:
  1157 0000A13D FEC8                <1> 	dec	al
  1158                              <1> 	;mov	cl, 26
  1159 0000A13F F6E1                <1> 	mul	cl
  1160                              <1> 
  1161                              <1> loc_pslsc_move_ldir_name2:
  1162 0000A141 8A4F0D              <1> 	mov	cl, [edi+0Dh] ; long name checksum
  1163 0000A144 880D[A74B0100]      <1> 	mov	[LFN_CheckSum], cl 
  1164 0000A14A 89FE                <1> 	mov	esi, edi ; LDIR_Order
  1165 0000A14C BF[A84B0100]        <1> 	mov	edi, LongFileName
  1166 0000A151 01C7                <1> 	add	edi, eax
  1167 0000A153 46                  <1> 	inc	esi
  1168 0000A154 B105                <1> 	mov	cl, 5 ; chars 1 to 5
  1169 0000A156 F366A5              <1> 	rep	movsw
  1170 0000A159 83C603              <1> 	add	esi, 3
  1171 0000A15C A5                  <1> 	movsd	; char 6 & 7 
  1172 0000A15D A5                  <1> 	movsd	; char 8 & 9
  1173 0000A15E A5                  <1> 	movsd	; char 10 & 11
  1174 0000A15F 46                  <1> 	inc	esi
  1175 0000A160 46                  <1> 	inc	esi 
  1176 0000A161 A5                  <1> 	movsd   ; char 12 & 13 
  1177                              <1> 
  1178                              <1> loc_pslnsc_retn:
  1179 0000A162 58                  <1>  	pop	eax
  1180                              <1> 	;pop	edx
  1181                              <1> 	;pop	ecx
  1182                              <1> 	;pop	ebx
  1183 0000A163 5E                  <1> 	pop	esi  
  1184 0000A164 5F                  <1> 	pop	edi
  1185                              <1>  
  1186 0000A165 C3                  <1>     	retn
  1187                              <1> 
  1188                              <1> parse_path_name:
  1189                              <1> 	; 10/02/2016
  1190                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  1191                              <1> 	; 10/009/2011 ('proc_parse_pathname')
  1192                              <1> 	; 27/11/2009
  1193                              <1> 	; 05/12/2004
  1194                              <1> 	;
  1195                              <1> 	; INPUT ->
  1196                              <1> 	;	ESI = Beginning of ASCIIZ pathname string
  1197                              <1> 	;       EDI = Destination Address
  1198                              <1> 	;	      (which is TR-DOS FindFile data buffer)
  1199                              <1> 	; OUTPUT ->
  1200                              <1> 	;	CF = 1 -> Error
  1201                              <1> 	;	     EAX = Error Code (AL)
  1202                              <1> 	;
  1203                              <1> 	; (Modified registers: eax, ecx, esi, edi) 
  1204                              <1> 	
  1205                              <1> 	; Clear the pathname bytes in TR-DOS Findfile data buffer 
  1206 0000A166 57                  <1> 	push	edi
  1207 0000A167 B914000000          <1> 	mov	ecx, 20  ; 80 bytes
  1208 0000A16C 31C0                <1> 	xor	eax, eax
  1209 0000A16E F3AB                <1> 	rep	stosd 
  1210 0000A170 5F                  <1> 	pop	edi
  1211                              <1> 
  1212 0000A171 668B06              <1> 	mov	ax, [esi]
  1213 0000A174 80FC3A              <1> 	cmp	ah, ':'
  1214 0000A177 741C                <1> 	je	short loc_ppn_change_drive
  1215 0000A179 A0[A6420100]        <1> 	mov	al, [Current_Drv]
  1216 0000A17E EB33                <1> 	jmp	short pass_ppn_change_drive
  1217                              <1> 
  1218                              <1> pass_ppn_cdir:
  1219 0000A180 8B35[CA4C0100]      <1> 	mov	esi, [First_Path_Pos]
  1220 0000A186 AC                  <1> 	lodsb
  1221                              <1> loc_ppn_get_filename:
  1222 0000A187 83C741              <1> 	add	edi, 65 ; FindFile_Name location
  1223                              <1> 	; TRDOS Filename length must not be more than 12 bytes
  1224                              <1> 	;mov	ecx, 12
  1225 0000A18A B10C                <1> 	mov	cl, 12
  1226                              <1> loc_ppn_get_fnchar_next:
  1227 0000A18C AA                  <1> 	stosb
  1228 0000A18D AC                  <1> 	lodsb
  1229 0000A18E 3C21                <1> 	cmp	al, 21h
  1230 0000A190 7274                <1> 	jb	short loc_ppn_clc_return 
  1231 0000A192 E2F8                <1>         loop    loc_ppn_get_fnchar_next
  1232                              <1> loc_ppn_return:
  1233 0000A194 C3                  <1> 	retn
  1234                              <1> 
  1235                              <1> loc_ppn_change_drive:
  1236 0000A195 24DF                <1> 	and	al, 0DFh
  1237 0000A197 2C41                <1> 	sub	al, 'A'; A:
  1238 0000A199 726F                <1> 	jc	short loc_ppn_invalid_drive
  1239 0000A19B 3805[E2FE0000]      <1> 	cmp	[Last_DOS_DiskNo], al
  1240 0000A1A1 7267                <1> 	jb	short loc_ppn_invalid_drive
  1241                              <1> 
  1242 0000A1A3 46                  <1> 	inc	esi
  1243 0000A1A4 46                  <1> 	inc	esi
  1244 0000A1A5 8A26                <1> 	mov	ah, [esi]
  1245 0000A1A7 80FC21              <1> 	cmp	ah, 21h
  1246 0000A1AA 7307                <1> 	jnb	short pass_ppn_change_drive
  1247                              <1> 
  1248                              <1> loc_ppn_cmd_failed:
  1249                              <1> 	; File or directory name is not existing
  1250 0000A1AC 8807                <1> 	mov	[edi], al ; Drv 
  1251 0000A1AE 66B80100            <1> 	mov	ax, 1 ; eax = 1
  1252                              <1> 	; TR-DOS Error Code 01h = Bad Command Argument
  1253                              <1> 	; MS-DOS Error Code 01h : Invalid Function Number
  1254                              <1> 	;stc
  1255                              <1> 	; (MainProg ErrMsg: "Bad command or file name!")
  1256 0000A1B2 C3                  <1> 	retn
  1257                              <1> 
  1258                              <1> pass_ppn_change_drive:
  1259 0000A1B3 8935[CA4C0100]      <1> 	mov	[First_Path_Pos], esi
  1260 0000A1B9 C705[CE4C0100]0000- <1> 	mov	dword [Last_Slash_Pos], 0
  1260 0000A1C1 0000                <1>
  1261 0000A1C3 AA                  <1> 	stosb
  1262 0000A1C4 8A06                <1> 	mov	al, [esi]
  1263                              <1> loc_scan_ppn_dslash:
  1264 0000A1C6 3C2F                <1> 	cmp	al, '/'
  1265 0000A1C8 7506                <1>   	jne	short loc_scan_next_slash_pos
  1266 0000A1CA 8935[CE4C0100]      <1> 	mov	[Last_Slash_Pos], esi
  1267                              <1> loc_scan_next_slash_pos:
  1268 0000A1D0 46                  <1> 	inc	esi
  1269 0000A1D1 8A06                <1> 	mov	al, [esi]
  1270 0000A1D3 3C20                <1> 	cmp	al, 20h
  1271 0000A1D5 77EF                <1> 	ja	short loc_scan_ppn_dslash
  1272 0000A1D7 833D[CE4C0100]00    <1> 	cmp	dword [Last_Slash_Pos], 0
  1273 0000A1DE 76A0                <1> 	jna	short pass_ppn_cdir
  1274                              <1> 	
  1275 0000A1E0 8B0D[CE4C0100]      <1> 	mov	ecx, [Last_Slash_Pos]
  1276 0000A1E6 8B35[CA4C0100]      <1> 	mov	esi, [First_Path_Pos]
  1277 0000A1EC 29F1                <1> 	sub	ecx, esi
  1278 0000A1EE 41                  <1> 	inc	ecx
  1279                              <1> 	;cmp	ecx, 64
  1280 0000A1EF 80F940              <1> 	cmp	cl, 64
  1281 0000A1F2 7715                <1> 	ja	short loc_ppn_invalid_drive_stc
  1282                              <1> 
  1283 0000A1F4 89F8                <1> 	mov	eax, edi ; Dest Dir String Location (65 byte)
  1284 0000A1F6 F3A4                <1> 	rep	movsb
  1285                              <1> 	;mov	[edi], cl ; 0, End of Dir String
  1286 0000A1F8 8B35[CE4C0100]      <1> 	mov	esi, [Last_Slash_Pos]
  1287 0000A1FE 46                  <1> 	inc	esi
  1288 0000A1FF 89C7                <1> 	mov	edi, eax
  1289 0000A201 AC                  <1> 	lodsb
  1290 0000A202 3C21                <1> 	cmp	al, 21h
  1291 0000A204 7381                <1> 	jnb	short loc_ppn_get_filename
  1292                              <1> loc_ppn_clc_return:
  1293                              <1> 	;clc
  1294 0000A206 31C0                <1> 	xor	eax, eax
  1295 0000A208 C3                  <1> 	retn
  1296                              <1> 
  1297                              <1> loc_ppn_invalid_drive_stc:
  1298 0000A209 F5                  <1> 	cmc	 ; stc
  1299                              <1> loc_ppn_invalid_drive:
  1300                              <1> 	; cf = 1
  1301                              <1> 	; The Drive Letter/Char < "A" or > "Z"
  1302 0000A20A 66B80F00            <1> 	mov	ax, 0Fh
  1303                              <1> 	; MS-DOS Error Code 0Fh = Disk Drive Invalid 
  1304                              <1> 	; (MainProg ErrMsg: "Drive not ready or read error!")
  1305 0000A20E C3                  <1> 	retn
  1306                              <1> 
  1307                              <1> find_longname:
  1308                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  1309                              <1> 	; 24/01/2010 (DIR.ASM, 'proc_find_longname')
  1310                              <1> 	; 17/10/2009
  1311                              <1> 	
  1312                              <1> 	; INPUT -> 
  1313                              <1> 	;	ESI = DOS short file name address
  1314                              <1> 	; 	for example: "filename.ext"
  1315                              <1> 	;
  1316                              <1> 	; OUTPUT ->
  1317                              <1> 	; 	ESI = ASCIIZ longname address (cf = 0)
  1318                              <1> 	;	cf = 1 -> error number returns in EAX (AL)
  1319                              <1> 	;	AL = 0 & CF=1 -> longname not found
  1320                              <1> 	;	     the file/directory has no longname
  1321                              <1> 	; 	cf = 0 -> AL = FAT Type 
  1322                              <1>  
  1323                              <1> 	; 17/10/2009
  1324                              <1> 	; ASCIIZ string will be returned
  1325                              <1> 	; as LongFileName
  1326                              <1> 	; clearing/reset is not needed
  1327                              <1> 	;mov	ecx, 33
  1328                              <1> 	;mov	edi, LongFileName
  1329                              <1> 	;sub	ax, ax ; 0
  1330                              <1> 	;rep	stosw
  1331                              <1> 
  1332                              <1> 	;mov	byte [LongNameFound], 0
  1333                              <1> 
  1334                              <1> 	; ESI = ASCIIZ file/directory name address
  1335                              <1> 	;   AL = Attributes AND mask 
  1336                              <1> 	;	(Result of AND must be equal to AL)
  1337                              <1> 	;   AH = Negative attributes mask 
  1338                              <1> 	;	(Result of AND must be ZERO)
  1339 0000A20F 66B80008            <1> 	mov	ax, 0800h 
  1340                              <1> 		; it must not be volume name or longname
  1341 0000A213 E837DDFFFF          <1> 	call	find_first_file
  1342 0000A218 7216                <1> 	jc	short loc_fln_retn
  1343                              <1>  
  1344                              <1> loc_fln_check_FAT_Type:
  1345 0000A21A 803D[A5420100]01    <1> 	cmp	byte [Current_FATType], 1
  1346 0000A221 7306                <1> 	jnb	short loc_fln_check_longname_yes_sign
  1347                              <1> 
  1348 0000A223 E839000000          <1> 	call	get_fs_longname
  1349 0000A228 C3                  <1> 	retn
  1350                              <1> 
  1351                              <1> loc_fln_check_longname_yes_sign:
  1352 0000A229 08FF                <1> 	or	bh, bh
  1353 0000A22B 7504                <1> 	jnz	short loc_fln_check_longnamefound_number
  1354                              <1> loc_fln_longname_not_found_retn:
  1355 0000A22D 31C0                <1> 	xor	eax, eax 
  1356                              <1> 	; cf = 1 & al = 0 -> longname not found
  1357 0000A22F F9                  <1> 	stc
  1358                              <1> loc_fln_retn:
  1359 0000A230 C3                  <1> 	retn
  1360                              <1> 
  1361                              <1> loc_fln_check_longnamefound_number:
  1362                              <1> 	; 'LongNameFound' is set by
  1363                              <1>         ; by 'save_longname_sub_component'
  1364                              <1> 	; which is called from
  1365                              <1> 	; 'find_directory_entry' 
  1366                              <1> 	; which is called from 
  1367                              <1> 	; 'find_first_file'
  1368                              <1> 	; It must 1 if the longname is valid
  1369 0000A231 803D[A54B0100]01    <1>         cmp     byte [LongNameFound], 1
  1370 0000A238 75F3                <1> 	jne	short loc_fln_longname_not_found_retn
  1371                              <1>              
  1372                              <1> loc_fln_calculate_checksum: 
  1373 0000A23A E813000000          <1> 	call	calculate_checksum
  1374                              <1> 	; AL = shortname checksum
  1375                              <1> 
  1376                              <1> loc_fln_longname_validation:
  1377                              <1> 	; 'LFN_CheckSum' has been set already
  1378                              <1> 	; by 'save_longname_sub_component'
  1379                              <1> 	; which is called from
  1380                              <1> 	; 'find_directory_entry' 
  1381                              <1> 	; which is called from 
  1382                              <1> 	; 'find_first_file'
  1383 0000A23F 3805[A74B0100]      <1> 	cmp	[LFN_CheckSum], al
  1384 0000A245 75E6                <1> 	jne	short loc_fln_longname_not_found_retn
  1385                              <1> 
  1386 0000A247 BE[A84B0100]        <1> 	mov	esi, LongFileName
  1387 0000A24C A0[A5420100]        <1> 	mov	al, [Current_FATType]
  1388 0000A251 C3                  <1> 	retn
  1389                              <1> 
  1390                              <1> calculate_checksum:
  1391                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  1392                              <1> 	; 17/10/2009 (DIR.ASM, 'proc_calculate_checksum')
  1393                              <1>         ;    
  1394                              <1> 	; INPUT ->
  1395                              <1> 	;	ESI = 11 byte DOS File Name location
  1396                              <1> 	;	(in DOS Directory Entry Format)
  1397                              <1> 	; OUTPUT ->
  1398                              <1> 	;	 AL = 8 bit checksum (CRC) value
  1399                              <1> 	;
  1400                              <1> 	; (Modified registers: EAX, ECX, ESI)
  1401                              <1> 
  1402                              <1> 	; Erdogan Tan [ 17-10-2009 ]
  1403                              <1> 	;  'ror al, 1' instruction
  1404                              <1> 
  1405                              <1> 	; Erdogan Tan [ 20-06-2004 ]
  1406                              <1> 	; This 8086 assembly code is an original code
  1407                              <1> 	; which is adapted from C code in
  1408                              <1> 	; Microsoft FAT32 File System Specification
  1409                              <1> 	; Version 1.03, December 6, 2000
  1410                              <1> 	; Page 28
  1411                              <1> 
  1412 0000A252 30C0                <1> 	xor	al, al
  1413 0000A254 B90B000000          <1> 	mov	ecx, 11
  1414                              <1> loc_next_sum:
  1415                              <1> 	;xor	ah, ah
  1416                              <1> 	;test	al, 1
  1417                              <1> 	;jz	short pass_ah_80h
  1418                              <1> 	;mov	ah, 80h
  1419                              <1> ;pass_ah_80h:
  1420                              <1> 	;shr	al, 1
  1421 0000A259 D0C8                <1> 	ror	al, 1 ; 17/10/2009  
  1422 0000A25B 0206                <1> 	add	al, [esi]
  1423 0000A25D 46                  <1> 	inc	esi
  1424                              <1> 	;add	al, ah
  1425 0000A25E E2F9                <1> 	loop	loc_next_sum
  1426 0000A260 C3                  <1> 	retn
  1427                              <1> 
  1428                              <1> get_fs_longname:
  1429                              <1> 	; temporary (13/02/2016)
  1430 0000A261 31C0                <1> 	xor eax, eax
  1431 0000A263 F9                  <1> 	stc
  1432 0000A264 C3                  <1> 	retn
  1433                              <1> 
  1434                              <1> make_sub_directory:
  1435                              <1> 	; 16/10/2016
  1436                              <1> 	; 02/03/2016, 03/03/2016
  1437                              <1> 	; 26/02/2016, 27/02/2016
  1438                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1439                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_make_directory')
  1440                              <1> 	; 10/07/2010
  1441                              <1> 	; INPUT ->
  1442                              <1> 	; 	ESI = ASCIIZ Directory Name
  1443                              <1> 	;	CL = Directory Attributes
  1444                              <1> 	; OUTPUT ->
  1445                              <1> 	;	EAX = New sub dir's first cluster
  1446                              <1> 	;	ESI = Logical Dos Drv Descr. Table Addr.
  1447                              <1> 	;	CF = 1 -> error code in AL (EAX)
  1448                              <1> 
  1449                              <1> 	;test	cl, 10h  ; directory
  1450                              <1> 	;jz	short loc_make_directory_access_denied
  1451                              <1> 	;test	cl, 08h ; volume name
  1452                              <1> 	;jnz	short loc_make_directory_access_denied
  1453                              <1> 
  1454 0000A265 80E107              <1> 	and	cl, 07h
  1455 0000A268 880D[244D0100]      <1> 	mov	byte [mkdir_attrib], cl
  1456                              <1> 
  1457 0000A26E 56                  <1> 	push	esi
  1458 0000A26F 31DB                <1> 	xor	ebx, ebx
  1459 0000A271 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  1460 0000A277 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1461 0000A27C 01DE                <1> 	add	esi, ebx
  1462 0000A27E 5B                  <1> 	pop	ebx
  1463                              <1> 
  1464                              <1> 	; 10/07/2010 -> 1st writable disk check for trdos
  1465                              <1> 	; LD_DiskType = 0 for write protection (read only) 
  1466 0000A27F 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  1467 0000A283 730B                <1> 	jnb	short loc_mkdir_check_file_sytem
  1468                              <1> 	; 16/10/2016 (13h -> 30)
  1469 0000A285 B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  1470 0000A28A BA00000000          <1> 	mov	edx, 0
  1471                              <1> 	; err retn: EDX = 0, EBX = Dir name offset
  1472                              <1> 	;ESI = Logical DOS drive description table address
  1473 0000A28F C3                  <1> 	retn
  1474                              <1> 
  1475                              <1> ;loc_make_directory_access_denied:
  1476                              <1> 	;mov	ax, 05h ; access denied (invalid attributes input)
  1477                              <1> 	;stc
  1478                              <1> 	;retn
  1479                              <1> 
  1480                              <1> loc_mkdir_check_file_sytem:
  1481 0000A290 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1482 0000A294 730B                <1> 	jnb	short loc_mkdir_check_free_sectors
  1483                              <1> 
  1484                              <1> loc_make_fs_directory:
  1485 0000A296 A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster]
  1486                              <1> 	; EAX = Parent directory DDT Address
  1487                              <1> 	; ESI = Logical DOS Drive DT Address
  1488                              <1> 	; EBX = Directory name offset (as ASCIIZ name)
  1489 0000A29B E8D8150000          <1> 	call	make_fs_directory
  1490 0000A2A0 C3                  <1> 	retn
  1491                              <1> 
  1492                              <1> loc_mkdir_check_free_sectors:
  1493 0000A2A1 0FB64613            <1>         movzx   eax, byte [esi+LD_BPB+SecPerClust]
  1494 0000A2A5 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1495 0000A2A8 39C1                <1> 	cmp	ecx, eax
  1496 0000A2AA 7255                <1> 	jb	short loc_mkdir_insufficient_disk_space
  1497                              <1> 
  1498                              <1> loc_make_fat_directory:
  1499 0000A2AC 891D[144D0100]      <1> 	mov	[mkdir_DirName_Offset], ebx
  1500 0000A2B2 890D[204D0100]      <1> 	mov	[mkdir_FreeSectors], ecx
  1501                              <1> 
  1502                              <1> 	;mov	al, [esi+LD_BPB+SecPerClust]
  1503 0000A2B8 A2[264D0100]        <1> 	mov	byte [mkdir_SecPerClust], al
  1504                              <1> 
  1505                              <1> loc_mkdir_gffc_1:
  1506 0000A2BD E812180000          <1> 	call	get_first_free_cluster
  1507 0000A2C2 722A                <1> 	jc	short loc_mkdir_gffc_retn
  1508                              <1> 
  1509                              <1> ;loc_mkdir_gffc_1_cont: 
  1510                              <1> 	;cmp	eax, 2
  1511                              <1> 	;jb	short loc_mkdir_gffc_insufficient_disk_space
  1512                              <1> 
  1513                              <1> ;loc_mkdir_gffc_1_save_fcluster:  
  1514 0000A2C4 A3[184D0100]        <1> 	mov	[mkdir_FFCluster], eax
  1515                              <1> 
  1516                              <1> loc_mkdir_locate_ffe:
  1517                              <1> 	; Current directory fcluster <> Directory buffer cluster
  1518                              <1> 	; Current directory will be reloaded by
  1519                              <1> 	; 'locate_current_dir_file' procedure
  1520                              <1> 	;
  1521                              <1> 	; ESI = Logical DOS Drive Description Table Address 
  1522                              <1> 	;push	esi ; 27/02/2016
  1523 0000A2C9 31C0                <1> 	xor	eax, eax
  1524 0000A2CB 89C1                <1>         mov	ecx, eax
  1525 0000A2CD 6649                <1> 	dec	cx ; FFFFh  
  1526                              <1> 	; CX = FFFFh -> find first deleted or free entry
  1527                              <1> 	; ESI would be ASCIIZ filename address if the call
  1528                              <1> 	; would not be for first free or deleted dir entry
  1529 0000A2CF E8D2FAFFFF          <1> 	call	locate_current_dir_file
  1530 0000A2D4 734C                <1> 	jnc	short loc_mkdir_set_ff_dir_entry_1
  1531                              <1> 	;pop	esi 
  1532                              <1> 	; ESI = Logical DOS Drive Description Table Address 
  1533 0000A2D6 83F802              <1> 	cmp	eax, 2  ; cmp al, 2 ; File/Dir not found !
  1534 0000A2D9 752B                <1> 	jne	short loc_mkdir_stc_return
  1535                              <1> 
  1536                              <1> loc_mkdir_add_new_cluster:
  1537 0000A2DB 3805[A5420100]      <1> 	cmp	byte [Current_FATType], al ; 2
  1538                              <1> 	;cmp	byte ptr [esi+LD_FATType], 2
  1539 0000A2E1 770C                <1> 	ja	short loc_mkdir_add_new_cluster_check_fsc
  1540 0000A2E3 803D[A4420100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  1541                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  1542 0000A2EA 7303                <1> 	jnb	short loc_mkdir_add_new_cluster_check_fsc
  1543                              <1> 
  1544 0000A2EC B00C                <1> 	mov	al, 12 ; No more files 
  1545                              <1> loc_mkdir_gffc_retn:
  1546 0000A2EE C3                  <1> 	retn
  1547                              <1> 
  1548                              <1> loc_mkdir_add_new_cluster_check_fsc:
  1549 0000A2EF 8B0D[204D0100]      <1> 	mov	ecx, [mkdir_FreeSectors]
  1550                              <1> 	;movzx	eax, byte [mkdir_SecPerClust]
  1551 0000A2F5 A0[264D0100]        <1> 	mov	al, [mkdir_SecPerClust]
  1552 0000A2FA 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  1553 0000A2FD 39C1                <1> 	cmp	ecx, eax
  1554 0000A2FF 7350                <1> 	jnb	short loc_mkdir_add_new_subdir_cluster
  1555                              <1> 
  1556                              <1> loc_mkdir_insufficient_disk_space:
  1557                              <1> 	;mov	edx, ecx
  1558                              <1> ;loc_mkdir_gffc_insufficient_disk_space:
  1559 0000A301 66B82700            <1> 	mov	ax, 27h ; MSDOS err => insufficient disk space
  1560                              <1> 	; err retn: EDX = Free sectors, EBX = Dir name offset
  1561                              <1>         ; ESI -> Dos drive description table address
  1562                              <1> 	;; ecx = edx
  1563                              <1> 	;
  1564 0000A305 C3                  <1> 	retn
  1565                              <1> 
  1566                              <1> loc_mkdir_stc_return:
  1567 0000A306 F9                  <1> 	stc
  1568 0000A307 C3                  <1> 	retn 
  1569                              <1> 
  1570                              <1> loc_mkdir_gffc_2:
  1571 0000A308 E8C7170000          <1> 	call	get_first_free_cluster
  1572 0000A30D 72DF                <1> 	jc	short loc_mkdir_gffc_retn
  1573                              <1> 
  1574                              <1> ;loc_mkdir_gffc_1_cont: 
  1575                              <1> 	;cmp	eax, 2
  1576                              <1> 	;jb	short loc_mkdir_gffc_insufficient_disk_space
  1577                              <1> 
  1578                              <1> ;loc_mkdir_gffc_2_save_fcluster:  
  1579 0000A30F A3[184D0100]        <1> 	mov	[mkdir_FFCluster], eax
  1580                              <1> 
  1581 0000A314 A1[1C4D0100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1582                              <1> 
  1583 0000A319 E845170000          <1> 	call	load_FAT_sub_directory 
  1584 0000A31E 72CE                <1> 	jc	short loc_mkdir_gffc_retn
  1585                              <1> 
  1586 0000A320 31FF                <1> 	xor	edi, edi
  1587                              <1> loc_mkdir_set_ff_dir_entry_1:
  1588                              <1> 	; 27/02/2016
  1589 0000A322 56                  <1> 	push	esi ; Logical DOS Drv Desc. Tbl. address
  1590                              <1> 	; EDI = Directory Entry Address
  1591 0000A323 8B35[144D0100]      <1> 	mov	esi, [mkdir_DirName_Offset]
  1592 0000A329 A1[184D0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1593                              <1> 
  1594 0000A32E 66B91000            <1> 	mov	cx, 10h	; CL = Directory attribute
  1595                              <1> 			; CH = 0 -> File size is 0
  1596 0000A332 0A0D[244D0100]      <1> 	or	cl, [mkdir_attrib] ; S, H, R  
  1597 0000A338 E8B0010000          <1> 	call	make_directory_entry
  1598                              <1> 
  1599 0000A33D 5E                  <1> 	pop	esi
  1600                              <1> 
  1601 0000A33E C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1602 0000A345 E880020000          <1> 	call	save_directory_buffer
  1603 0000A34A 0F83DA000000        <1>         jnc     loc_mkdir_set_ff_dir_entry_2
  1604                              <1> 
  1605                              <1> loc_mkdir_return:
  1606 0000A350 C3                  <1> 	retn
  1607                              <1> 
  1608                              <1> loc_mkdir_add_new_subdir_cluster:
  1609 0000A351 8B15[D54A0100]      <1> 	mov	edx, [DirBuff_Cluster]
  1610 0000A357 8915[1C4D0100]      <1> 	mov	[mkdir_LastDirCluster], edx       
  1611                              <1> 
  1612 0000A35D A1[184D0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1613 0000A362 E8FC160000          <1> 	call	load_FAT_sub_directory 
  1614 0000A367 72E7                <1> 	jc	short loc_mkdir_return
  1615                              <1> 	; eax = 0
  1616                              <1> 	; ecx =  directory buffer sector count (<= 128)
  1617                              <1> 
  1618                              <1> pass_mkdir_add_new_subdir_cluster:
  1619 0000A369 29FF                <1> 	sub	edi, edi ; 0
  1620                              <1> 	;mov	al, 128 ; double word
  1621                              <1> 	;mul	ecx ; ecx =  directory buffer sector count
  1622                              <1> 	;mov	ecx, eax
  1623                              <1> 	;shl	cx, 7 ; 128 * sector count	
  1624 0000A36B 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1625 0000A36F 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1626 0000A373 66F7E1              <1> 	mul	cx ; max = 128*(512/4) -> 16384 (stosd)
  1627 0000A376 6689C1              <1> 	mov	cx, ax
  1628 0000A379 6629C0              <1> 	sub	ax, ax ; 0
  1629 0000A37C F3AB                <1> 	rep	stosd ; clear directory buffer
  1630                              <1> 
  1631 0000A37E C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1632 0000A385 E840020000          <1> 	call	save_directory_buffer 
  1633 0000A38A 72C4                <1> 	jc	short loc_mkdir_return
  1634                              <1> 
  1635                              <1> loc_mkdir_save_added_cluster:
  1636 0000A38C A1[1C4D0100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1637 0000A391 8B0D[184D0100]      <1> 	mov	ecx, [mkdir_FFCluster]
  1638                              <1> 	; 01/03/2016
  1639 0000A397 31D2                <1> 	xor	edx, edx
  1640 0000A399 8915[C64A0100]      <1> 	mov	[FAT_ClusterCounter], edx ; 0 ; reset
  1641 0000A39F E803180000          <1> 	call	update_cluster
  1642 0000A3A4 7304                <1> 	jnc	short loc_mkdir_save_fat_buffer_0
  1643 0000A3A6 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1644 0000A3A8 7518                <1> 	jnz	short loc_mkdir_save_fat_buffer_stc_retn
  1645                              <1> 
  1646                              <1> loc_mkdir_save_fat_buffer_0:
  1647 0000A3AA A1[184D0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1648 0000A3AF A3[1C4D0100]        <1> 	mov	[mkdir_LastDirCluster], eax
  1649                              <1> 
  1650 0000A3B4 31C9                <1> 	xor	ecx, ecx
  1651 0000A3B6 49                  <1> 	dec	ecx ; FFFFFFFFh
  1652                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1653 0000A3B7 E8EB170000          <1> 	call	update_cluster
  1654 0000A3BC 731A                <1> 	jnc	short loc_mkdir_save_fat_buffer_1
  1655 0000A3BE 09C0                <1> 	or	eax, eax
  1656 0000A3C0 7416                <1> 	jz	short loc_mkdir_save_fat_buffer_1
  1657                              <1> 
  1658                              <1> loc_mkdir_save_fat_buffer_stc_retn:
  1659                              <1> 	; 01/03/2016
  1660 0000A3C2 803D[C64A0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1661 0000A3C9 720C                <1> 	jb	short loc_mkdir_save_fat_buffer_retn
  1662                              <1> 
  1663 0000A3CB 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1664                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1665 0000A3CF 50                  <1> 	push	eax
  1666 0000A3D0 E8241B0000          <1> 	call	calculate_fat_freespace
  1667 0000A3D5 58                  <1> 	pop	eax
  1668 0000A3D6 F9                  <1> 	stc
  1669                              <1> loc_mkdir_save_fat_buffer_retn:
  1670 0000A3D7 C3                  <1> 	retn
  1671                              <1> 
  1672                              <1> loc_mkdir_save_fat_buffer_1:
  1673                              <1> 	; byte [FAT_BuffValidData] = 2 
  1674 0000A3D8 E8871A0000          <1> 	call	save_fat_buffer
  1675 0000A3DD 72E3                <1> 	jc	short loc_mkdir_save_fat_buffer_stc_retn
  1676                              <1> 
  1677                              <1> 	; 01/03/2016
  1678 0000A3DF 803D[C64A0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1679 0000A3E6 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_2
  1680                              <1> 
  1681                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1682 0000A3E8 A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1683 0000A3ED 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1684 0000A3F1 E8031B0000          <1> 	call	calculate_fat_freespace
  1685                              <1> 
  1686                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  1687                              <1> 	;jnz	short loc_mkdir_save_fat_buffer_2
  1688                              <1> 
  1689                              <1> 	; ecx > 0 -> Recalculation is needed
  1690 0000A3F6 09C9                <1> 	or	ecx, ecx 
  1691 0000A3F8 7409                <1> 	jz	short loc_mkdir_save_fat_buffer_2
  1692                              <1> 
  1693 0000A3FA 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  1694 0000A3FE E8F61A0000          <1> 	call	calculate_fat_freespace
  1695                              <1> 
  1696                              <1> loc_mkdir_save_fat_buffer_2:
  1697 0000A403 C605[274D0100]01    <1> 	mov	byte [mkdir_add_new_cluster], 1
  1698 0000A40A E9C4000000          <1> 	jmp	loc_mkdir_upd_parent_dir_lmdt
  1699                              <1> 
  1700                              <1> loc_mkdir_update_sub_dir_cluster:
  1701 0000A40F A1[184D0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1702 0000A414 29C9                <1> 	sub	ecx, ecx ; 0
  1703                              <1> 	; 01/03/2016
  1704 0000A416 890D[C64A0100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; Reset
  1705 0000A41C 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1706                              <1> 
  1707                              <1> 	; ESI = Logical DOS Drive Descisption Table address  
  1708 0000A41D E885170000          <1> 	call	update_cluster
  1709 0000A422 7379                <1> 	jnc	short loc_mkdir_save_fat_buffer_3
  1710 0000A424 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1711 0000A426 7475                <1> 	jz	short loc_mkdir_save_fat_buffer_3
  1712                              <1> 	; 01/03/2016
  1713 0000A428 EB98                <1> 	jmp	short loc_mkdir_save_fat_buffer_stc_retn
  1714                              <1> 
  1715                              <1> loc_mkdir_set_ff_dir_entry_2:
  1716                              <1> 	; ESI = Logical DOS Drive Description Table address  
  1717 0000A42A A1[184D0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1718                              <1> 	; Load disk sectors as a directory cluster
  1719 0000A42F E82F160000          <1> 	call	load_FAT_sub_directory 
  1720 0000A434 7266                <1> 	jc	short retn_make_fat_directory
  1721                              <1> 	
  1722                              <1> 	; eax = 0
  1723                              <1> 	; ecx =  directory buffer sector count (<= 128)
  1724                              <1> 
  1725 0000A436 BF40000800          <1> 	mov	edi, Directory_Buffer + 64 ; 26/02/2016
  1726                              <1> 
  1727                              <1> 	; 02/03/2016
  1728 0000A43B 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1729 0000A43F 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1730 0000A443 F7E1                <1> 	mul 	ecx
  1731 0000A445 89C1                <1> 	mov	ecx, eax
  1732 0000A447 6629C0              <1> 	sub	ax, ax
  1733 0000A44A F3AB                <1> 	rep	stosd
  1734                              <1> 
  1735                              <1> 	;;mov	al, 128 ; double word
  1736                              <1> 	;;mul	ecx ; ecx =  directory buffer sector count
  1737                              <1> 	;;mov	ecx, eax
  1738                              <1> 	;shl	cx, 7 ; 128 * sector count	
  1739                              <1> 	;;sub	eax, eax
  1740                              <1> 	;;sub	al, al ; 0
  1741                              <1> 	;rep	stosd ; clear directory buffer
  1742                              <1> 
  1743 0000A44C BF00000800          <1> 	mov	edi, Directory_Buffer ; 26/02/2016
  1744                              <1> 	
  1745 0000A451 56                  <1> 	push	esi
  1746                              <1> 
  1747 0000A452 BE[284D0100]        <1> 	mov	esi, mkdir_Name
  1748 0000A457 66C7062E00          <1> 	mov	word [esi], 2Eh ; db '.', '0'
  1749                              <1> 
  1750 0000A45C A1[184D0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1751 0000A461 66B91000            <1> 	mov	cx, 10h ; CL = Directory attribute
  1752                              <1> 			; CH = 0 -> File size is 0
  1753 0000A465 E883000000          <1> 	call	make_directory_entry
  1754                              <1> 
  1755 0000A46A BF20000800          <1> 	mov	edi, Directory_Buffer + 32 ; 26/02/2016
  1756                              <1> 
  1757                              <1> 	; 03/03/2016
  1758                              <1> 	; Following modification has been done according to 
  1759                              <1> 	; 'Microsoft Extensible Firmware Initiative
  1760                              <1> 	; FAT32 File System Specification' document,
  1761                              <1> 	; 'FAT: General Overview of On-Disk FormatPage 25'.
  1762                              <1> 	; "Finally, you set DIR_FstClusLO and DIR_FstClusHI
  1763                              <1> 	; for the dotdot entry (the second entry) to the
  1764                              <1> 	; first cluster number of the directory in which you 
  1765                              <1> 	; just created the directory (value is 0 if this directory
  1766                              <1> 	; is the root directory even for FAT32 volumes)."
  1767                              <1> 	; (Correctness of this modification has been verified
  1768                              <1> 	;  by using Windows 98 'scandisk.exe'.)
  1769                              <1> 
  1770 0000A46F 29C0                <1> 	sub	eax, eax
  1771 0000A471 3805[A4420100]      <1> 	cmp	byte [Current_Dir_Level], al ; 0
  1772 0000A477 7605                <1> 	jna	short loc_mkdir_set_ff_dir_entry_3
  1773 0000A479 A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster] ; parent dir
  1774                              <1> loc_mkdir_set_ff_dir_entry_3:
  1775 0000A47E 66C746012E00        <1> 	mov	word [esi+1], 2Eh ; db '.', '0'
  1776                              <1> 
  1777                              <1> 	;mov	cx, 10h
  1778 0000A484 E864000000          <1> 	call	make_directory_entry
  1779                              <1> 
  1780 0000A489 5E                  <1> 	pop	esi
  1781                              <1> 
  1782 0000A48A C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1783 0000A491 E834010000          <1> 	call	save_directory_buffer
  1784 0000A496 0F8373FFFFFF        <1>         jnc     loc_mkdir_update_sub_dir_cluster
  1785                              <1>  
  1786                              <1> retn_make_fat_directory:
  1787 0000A49C C3                  <1> 	retn
  1788                              <1> 
  1789                              <1> loc_mkdir_save_fat_buffer_3:
  1790                              <1> 	; 01/03/2016
  1791                              <1> 	; byte [FAT_BuffValidData] = 2 
  1792 0000A49D E8C2190000          <1> 	call	save_fat_buffer
  1793 0000A4A2 0F821AFFFFFF        <1>         jc      loc_mkdir_save_fat_buffer_stc_retn
  1794                              <1> 
  1795 0000A4A8 803D[C64A0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1796 0000A4AF 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_4
  1797                              <1> 
  1798                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1799 0000A4B1 A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1800 0000A4B6 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1801 0000A4BA E83A1A0000          <1> 	call	calculate_fat_freespace
  1802                              <1> 
  1803                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  1804                              <1>         ;jnz    short loc_mkdir_save_fat_buffer_4
  1805                              <1> 
  1806                              <1> 	; ecx > 0 -> Recalculation is needed
  1807 0000A4BF 09C9                <1> 	or	ecx, ecx 
  1808 0000A4C1 7409                <1>         jz      short loc_mkdir_save_fat_buffer_4
  1809                              <1> 
  1810 0000A4C3 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space
  1811 0000A4C7 E82D1A0000          <1> 	call	calculate_fat_freespace
  1812                              <1> 
  1813                              <1> loc_mkdir_save_fat_buffer_4:	
  1814 0000A4CC C605[274D0100]00    <1> 	mov	byte [mkdir_add_new_cluster], 0
  1815                              <1> 
  1816                              <1> loc_mkdir_upd_parent_dir_lmdt:
  1817 0000A4D3 E88D010000          <1> 	call	update_parent_dir_lmdt
  1818                              <1> 
  1819                              <1> 	; 01/03/2016
  1820 0000A4D8 803D[274D0100]00    <1> 	cmp	byte [mkdir_add_new_cluster], 0
  1821 0000A4DF 0F8723FEFFFF        <1>         ja      loc_mkdir_gffc_2
  1822                              <1> 
  1823                              <1> loc_mkdir_retn_new_dir_cluster:
  1824 0000A4E5 A1[184D0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1825 0000A4EA 31D2                <1> 	xor	edx, edx
  1826                              <1> loc_mkdir_retn:
  1827 0000A4EC C3                  <1> 	retn
  1828                              <1> 
  1829                              <1> make_directory_entry:
  1830                              <1> 	; 02/03/2016
  1831                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1832                              <1> 	; 09/08/2010 (DIR.ASM, 'proc_make_directory_entry')
  1833                              <1> 	; 17/07/2010
  1834                              <1> 	; INPUT ->
  1835                              <1> 	; 	EDI = Directory Entry Address
  1836                              <1> 	;	ESI = Dot File Name Location
  1837                              <1> 	;	EAX = First Cluster
  1838                              <1> 	;	File Size = 0 (Must be set later)
  1839                              <1> 	;	CL = Attributes
  1840                              <1> 	;	CH = 0 (File size = 0) 
  1841                              <1> 	;	(If CH>0, File size is in dword [EBX]) (*)
  1842                              <1> 	; OUTPUT -> 
  1843                              <1> 	;	EDI = Directory Entry Address
  1844                              <1> 	;	ESI = Dot File Name Location (Capitalized)
  1845                              <1> 	;	If CH input = 0, File Size = 0
  1846                              <1> 	;	Otherwise file size is as dword [EBX] (*)
  1847                              <1> 	;	DX = Date, AX = Time in DOS Dir Entry format
  1848                              <1> 	;	EBX = same
  1849                              <1> 	;	ECX = same
  1850                              <1> 
  1851 0000A4ED 51                  <1> 	push	ecx
  1852                              <1> 
  1853 0000A4EE 884F0B              <1> 	mov	[edi+11], cl ; Attributes
  1854 0000A4F1 6689471A            <1> 	mov	[edi+26], ax ; FClusterLw, 26
  1855 0000A4F5 C1E810              <1> 	shr	eax, 16
  1856 0000A4F8 66894714            <1> 	mov	[edi+20], ax ; FClusterHw, 20
  1857 0000A4FC 6631C0              <1> 	xor	ax, ax 
  1858 0000A4FF 6689470C            <1> 	mov	[edi+12], ax ; NTReserved, 12
  1859                              <1> 			     ; CrtTimeTenth, 13
  1860 0000A503 08ED                <1> 	or	ch, ch
  1861 0000A505 7402                <1> 	jz	short loc_make_direntry_set_filesize
  1862                              <1> 
  1863 0000A507 8B03                <1> 	mov	eax, [ebx]
  1864                              <1>         
  1865                              <1> loc_make_direntry_set_filesize:
  1866 0000A509 89471C              <1> 	mov	[edi+28], eax ; FileSize, 28
  1867                              <1> 	
  1868 0000A50C E88AFBFFFF          <1> 	call	convert_file_name
  1869                              <1> 	;EDI = Dir Entry Format File Name Location
  1870                              <1> 	;ESI = Dot File Name Location (capitalized)
  1871                              <1> 
  1872 0000A511 E816000000          <1> 	call	convert_current_date_time
  1873                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1874                              <1>         ; 	    AX = Time in dos dir entry format
  1875 0000A516 6689470E            <1> 	mov	[edi+14], ax ; CrtTime, 14
  1876 0000A51A 66895710            <1> 	mov	[edi+16], dx ; CrtDate, 16
  1877 0000A51E 66895712            <1> 	mov	[edi+18], dx ; LastAccDate, 18
  1878 0000A522 66894716            <1> 	mov	[edi+22], ax ; WrtTime, 14
  1879 0000A526 66895718            <1> 	mov	[edi+24], dx ; WrtDate, 16
  1880 0000A52A 59                  <1> 	pop	ecx
  1881                              <1> 
  1882 0000A52B C3                  <1> 	retn
  1883                              <1> 
  1884                              <1> convert_current_date_time:
  1885                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1886                              <1> 	; 13/06/2010 (DIR.ASM, 'proc_convert_current_date_time')
  1887                              <1> 	; converts date&time to dos dir entry format
  1888                              <1> 	; INPUT -> none
  1889                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1890                              <1> 	;           AX = Time in dos dir entry format
  1891                              <1>  
  1892 0000A52C B404                <1> 	mov	ah, 04h ; Return Current Date
  1893 0000A52E E8A0B3FFFF          <1> 	call	int1Ah 
  1894                              <1> 
  1895 0000A533 88E8                <1> 	mov	al, ch ; <- century BCD
  1896 0000A535 240F                <1> 	and	al, 0Fh
  1897 0000A537 88EC                <1> 	mov	ah, ch
  1898 0000A539 C0EC04              <1> 	shr	ah, 4
  1899 0000A53C D50A                <1> 	aad
  1900 0000A53E 88C5                <1> 	mov	ch, al ; -> century 
  1901                              <1> 
  1902 0000A540 88C8                <1> 	mov	al, cl ; <- year BCD
  1903 0000A542 240F                <1> 	and	al, 0Fh
  1904 0000A544 88CC                <1> 	mov	ah, cl
  1905 0000A546 C0EC04              <1> 	shr	ah, 4
  1906 0000A549 D50A                <1> 	aad
  1907 0000A54B 88C1                <1> 	mov	cl, al ; -> year
  1908                              <1> 
  1909 0000A54D 88E8                <1> 	mov	al, ch
  1910 0000A54F B464                <1> 	mov	ah, 100
  1911 0000A551 F6E4                <1> 	mul	ah
  1912 0000A553 30ED                <1> 	xor	ch, ch
  1913 0000A555 6601C8              <1> 	add	ax, cx
  1914 0000A558 662DBC07            <1> 	sub	ax, 1980 ; ms-dos epoch
  1915 0000A55C 6689C1              <1> 	mov	cx, ax
  1916                              <1> 
  1917 0000A55F 88F0                <1> 	mov	al, dh ; <- month in bcd
  1918 0000A561 240F                <1> 	and	al, 0Fh
  1919 0000A563 88F4                <1> 	mov	ah, dh
  1920 0000A565 C0EC04              <1> 	shr	ah, 4
  1921 0000A568 D50A                <1> 	aad
  1922 0000A56A 88C6                <1> 	mov	dh, al ; -> month
  1923                              <1> 
  1924 0000A56C 88D0                <1> 	mov	al, dl ; <- day BCD
  1925 0000A56E 240F                <1> 	and	al, 0Fh
  1926 0000A570 88D4                <1> 	mov	ah, dl
  1927 0000A572 C0EC04              <1> 	shr	ah, 4
  1928 0000A575 D50A                <1> 	aad
  1929 0000A577 88C2                <1> 	mov	dl, al ; -> day
  1930                              <1> 
  1931 0000A579 88C8                <1> 	mov	al, cl ; count of years from 1980
  1932 0000A57B 66C1E004            <1> 	shl	ax, 4
  1933 0000A57F 08F0                <1> 	or	al, dh ; month of year, 1 to 12
  1934 0000A581 66C1E005            <1> 	shl	ax, 5
  1935 0000A585 08D0                <1> 	or	al, dl ; day of year, 1 to 31
  1936                              <1> 	
  1937 0000A587 6650                <1> 	push	ax ; push date
  1938                              <1> 
  1939 0000A589 B402                <1> 	mov	ah, 02h ; Return Current Time
  1940 0000A58B E843B3FFFF          <1> 	call	int1Ah
  1941                              <1> 
  1942 0000A590 88E8                <1> 	mov	al, ch ; <- hours BCD
  1943 0000A592 240F                <1> 	and	al, 0Fh
  1944 0000A594 88EC                <1> 	mov	ah, ch
  1945 0000A596 C0EC04              <1> 	shr	ah, 4
  1946 0000A599 D50A                <1> 	aad
  1947 0000A59B 88C5                <1> 	mov	ch, al ; -> hours
  1948                              <1> 
  1949 0000A59D 88C8                <1> 	mov	al, cl ; <- minutes BCD
  1950 0000A59F 240F                <1> 	and	al, 0Fh
  1951 0000A5A1 88CC                <1> 	mov	ah, cl
  1952 0000A5A3 C0EC04              <1> 	shr	ah, 4
  1953 0000A5A6 D50A                <1> 	aad
  1954 0000A5A8 88C1                <1> 	mov	cl, al ; -> minutes
  1955                              <1> 
  1956 0000A5AA 88F0                <1> 	mov	al, dh ; <- seconds BCD
  1957 0000A5AC 240F                <1> 	and	al, 0Fh
  1958 0000A5AE 88F4                <1> 	mov	ah, dh
  1959 0000A5B0 C0EC04              <1> 	shr	ah, 4
  1960 0000A5B3 D50A                <1> 	aad
  1961 0000A5B5 88C6                <1> 	mov	dh, al ; -> seconds
  1962                              <1> 
  1963 0000A5B7 88E8                <1> 	mov	al, ch ; hours
  1964 0000A5B9 66C1E006            <1> 	shl	ax, 6
  1965 0000A5BD 08C8                <1> 	or	al, cl ; minutes
  1966 0000A5BF 66C1E005            <1> 	shl	ax, 5
  1967 0000A5C3 D0EE                <1> 	shr	dh, 1 ; 2 seconds
  1968                              <1> 	; There is a bug in TRDOS v1 here !
  1969                              <1> 	; it was 'or al, dl' ! 
  1970 0000A5C5 08F0                <1> 	or	al, dh ; seconds
  1971                              <1> 
  1972 0000A5C7 665A                <1> 	pop	dx ; pop date
  1973                              <1> 	
  1974 0000A5C9 C3                  <1> 	retn
  1975                              <1> 
  1976                              <1> save_directory_buffer:
  1977                              <1> 	; 15/10/2016
  1978                              <1> 	; 23/03/2016
  1979                              <1> 	; 26/02/2016
  1980                              <1> 	; 22/02/2016 (TRDOS 386 = TRDOS v2.0)
  1981                              <1> 	; 01/08/2011
  1982                              <1> 	; 14/03/2010
  1983                              <1> 	; INPUT ->
  1984                              <1> 	; 	 none
  1985                              <1> 	; OUTPUT ->
  1986                              <1> 	;  cf = 0 -> write OK...
  1987                              <1> 	;  cf = 1 -> error code in AL (EAX)
  1988                              <1> 	;  cf = 1 & AL = 0Dh => CH & CL = FS & FAT type
  1989                              <1> 	;  EBX = Directory Buffer Address
  1990                              <1> 	;
  1991                              <1> 	;  (EAX, ECX, EDX will be modified)
  1992                              <1>  
  1993 0000A5CA BB00000800          <1> 	mov	ebx, Directory_Buffer
  1994 0000A5CF 803D[D04A0100]02    <1> 	cmp	byte [DirBuff_ValidData], 2
  1995 0000A5D6 7403                <1> 	je	short loc_save_dir_buffer
  1996 0000A5D8 31C0                <1> 	xor	eax, eax
  1997 0000A5DA C3                  <1> 	retn            
  1998                              <1> 
  1999                              <1> loc_save_dir_buffer:
  2000 0000A5DB 56                  <1> 	push	esi
  2001 0000A5DC 31DB                <1> 	xor	ebx, ebx 
  2002 0000A5DE 8A3D[CE4A0100]      <1>         mov     bh, [DirBuff_DRV]
  2003 0000A5E4 80EF41              <1> 	sub	bh, 'A'
  2004 0000A5E7 BE00010900          <1>         mov     esi, Logical_DOSDisks
  2005 0000A5EC 01DE                <1> 	add	esi, ebx
  2006 0000A5EE 668B4E03            <1>         mov     cx, [esi+LD_FATType]
  2007                              <1> 	; CH = FS Type (A1h for FS)
  2008                              <1> 	; CL = FAT Type (0 for FS)
  2009 0000A5F2 08C9                <1> 	or	cl, cl
  2010 0000A5F4 7433                <1> 	jz	short loc_save_dir_buff_stc_retn
  2011                              <1> 
  2012                              <1> loc_save_dir_buffer_check_cluster_no:    
  2013 0000A5F6 A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2014 0000A5FB 28FF                <1> 	sub	bh, bh ; ebx = 0
  2015 0000A5FD 09C0                <1> 	or	eax, eax
  2016 0000A5FF 7540                <1> 	jnz	short loc_save_sub_dir_buffer
  2017 0000A601 8A25[CF4A0100]      <1> 	mov	ah, [DirBuff_FATType]
  2018 0000A607 FEC3                <1> 	inc	bl ;  bl = 1
  2019 0000A609 38DC                <1> 	cmp	ah, bl
  2020 0000A60B 721D                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2021 0000A60D FEC3                <1> 	inc	bl ; bl = 2
  2022 0000A60F 38E3                <1> 	cmp	bl, ah
  2023 0000A611 7217                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2024                              <1> 
  2025                              <1> loc_save_root_dir_buffer:
  2026 0000A613 668B5E17            <1> 	mov	bx, [esi+LD_BPB+RootDirEnts]
  2027 0000A617 6683C30F            <1> 	add	bx, 15
  2028 0000A61B 66C1EB04            <1> 	shr	bx, 4 ; 16 dir entries per sector
  2029 0000A61F 6609DB              <1> 	or	bx, bx
  2030 0000A622 7405                <1> 	jz	short loc_save_dir_buff_stc_retn
  2031                              <1> 	;mov	ecx, ebx 
  2032 0000A624 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin] ; 26/02/2016
  2033 0000A627 EB23                <1> 	jmp	short loc_write_directory_to_disk
  2034                              <1> 
  2035                              <1> loc_save_dir_buff_stc_retn:
  2036 0000A629 F9                  <1> 	stc
  2037                              <1> loc_save_dir_buff_inv_data_retn:
  2038                              <1> 	; 15/10/2016 (0Dh -> 29)
  2039 0000A62A B01D                <1> 	mov	al, 29 ; Invalid data !
  2040 0000A62C C605[D04A0100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2041 0000A633 EB05                <1> 	jmp	short loc_save_dir_buff_retn 
  2042                              <1> 
  2043                              <1> loc_write_directory_to_disk_err:
  2044                              <1> 	; 15/10/2016 (disk write error code, 1Dh -> 18)
  2045 0000A635 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error 
  2046                              <1> 
  2047                              <1> loc_save_dir_buff_retn:
  2048 0000A63A BB00000800          <1> 	mov	ebx, Directory_Buffer
  2049 0000A63F 5E                  <1> 	pop	esi
  2050 0000A640 C3                  <1> 	retn
  2051                              <1>  
  2052                              <1> loc_save_sub_dir_buffer:
  2053                              <1> 	; ebx  = 0
  2054 0000A641 83E802              <1> 	sub	eax, 2
  2055 0000A644 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2056 0000A647 F7E3                <1> 	mul	ebx
  2057 0000A649 034668              <1>         add     eax, [esi+LD_DATABegin]
  2058                              <1>  	;mov	ecx, ebx
  2059                              <1> 
  2060                              <1> loc_write_directory_to_disk:
  2061 0000A64C 89D9                <1>  	mov	ecx, ebx
  2062 0000A64E BB00000800          <1> 	mov	ebx, Directory_Buffer
  2063 0000A653 E8824A0000          <1> 	call	disk_write
  2064 0000A658 72DB                <1> 	jc	short loc_write_directory_to_disk_err
  2065                              <1> 
  2066                              <1> loc_save_dir_buff_validate_retn:
  2067 0000A65A C605[D04A0100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2068 0000A661 31C0                <1> 	xor	eax, eax
  2069                              <1> 	; 26/02/2016
  2070 0000A663 EBD5                <1> 	jmp	short loc_save_dir_buff_retn
  2071                              <1> 
  2072                              <1> update_parent_dir_lmdt:
  2073                              <1> 	; 22/02/2016 (TRDOS 386 = TRDOS v2.0)
  2074                              <1> 	; 01/08/2011
  2075                              <1> 	; 16/10/2010 
  2076                              <1> 	; 
  2077                              <1> 	; INPUT -> 
  2078                              <1> 	;	none
  2079                              <1>  	; OUTPUT ->
  2080                              <1> 	;	(last modification date & time of the parent dir
  2081                              <1> 	;	will be changed/updated)
  2082                              <1> 	;
  2083                              <1> 	; (EAX, EBX, ECX, EDX, EDI will be changed)
  2084                              <1> 
  2085 0000A665 29C0                <1> 	sub	eax, eax
  2086 0000A667 8A25[A4420100]      <1> 	mov	ah, [Current_Dir_Level]
  2087 0000A66D A0[A5420100]        <1> 	mov	al, [Current_FATType]
  2088 0000A672 3C01                <1> 	cmp	al, 1
  2089 0000A674 723A                <1> 	jb	short loc_UPDLMDT_proc_retn
  2090                              <1>     
  2091                              <1> loc_update_parent_dir_lm_date_time:
  2092 0000A676 08E4                <1> 	or	ah, ah
  2093 0000A678 7436                <1> 	jz	short loc_UPDLMDT_proc_retn
  2094                              <1> 
  2095 0000A67A 56                  <1> 	push	esi ; *
  2096 0000A67B 8825[484D0100]      <1> 	mov	[UPDLMDT_CDirLevel], ah
  2097 0000A681 8B15[A0420100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2098 0000A687 8915[494D0100]      <1> 	mov	[UPDLMDT_CDirFCluster], edx
  2099                              <1> 
  2100 0000A68D FECC                <1> 	dec	ah
  2101 0000A68F B90C000000          <1> 	mov	ecx, 12
  2102 0000A694 BE[074B0100]        <1>         mov     esi, PATH_Array
  2103                              <1> 
  2104 0000A699 8825[A4420100]      <1> 	mov	[Current_Dir_Level], ah
  2105 0000A69F 08E4                <1> 	or	ah, ah
  2106 0000A6A1 750E                <1> 	jnz	short loc_update_parent_dir_lmdt_load_sub_dir_1
  2107 0000A6A3 803D[A5420100]02    <1> 	cmp	byte [Current_FATType], 2
  2108 0000A6AA 770B                <1> 	ja	short loc_update_parent_dir_lmdt_load_sub_dir_2
  2109 0000A6AC 28C0                <1> 	sub	al, al ; eax = 0
  2110 0000A6AE EB0A                <1> 	jmp	short loc_update_parent_dir_lmdt_load_sub_dir_3
  2111                              <1> 
  2112                              <1> loc_UPDLMDT_proc_retn:
  2113 0000A6B0 C3                  <1> 	retn
  2114                              <1>          
  2115                              <1> loc_update_parent_dir_lmdt_load_sub_dir_1:
  2116 0000A6B1 B010                <1> 	mov	al, 16
  2117 0000A6B3 F6E4                <1> 	mul	ah 
  2118 0000A6B5 01C6                <1> 	add	esi, eax
  2119                              <1> 
  2120                              <1> loc_update_parent_dir_lmdt_load_sub_dir_2:  
  2121 0000A6B7 8B460C              <1> 	mov	eax, [esi+12] ; Parent Dir First Cluster
  2122                              <1> 
  2123                              <1> loc_update_parent_dir_lmdt_load_sub_dir_3:
  2124 0000A6BA A3[A0420100]        <1> 	mov	[Current_Dir_FCluster], eax
  2125                              <1> 
  2126 0000A6BF 83C610              <1> 	add	esi, 16
  2127 0000A6C2 66BF[2E4C]          <1> 	mov	di, Dir_File_Name  
  2128 0000A6C6 F3A4                <1> 	rep	movsb
  2129                              <1> 	
  2130 0000A6C8 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2131 0000A6CD 29DB                <1> 	sub	ebx, ebx
  2132 0000A6CF 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  2133 0000A6D5 01DE                <1> 	add	esi, ebx
  2134 0000A6D7 E88FF7FFFF          <1> 	call	reload_current_directory
  2135 0000A6DC 7232                <1> 	jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2136                              <1> 
  2137                              <1> loc_update_parent_dir_lmdt_locate_dir: 
  2138 0000A6DE BE[2E4C0100]        <1> 	mov	esi, Dir_File_Name        
  2139 0000A6E3 6631C9              <1> 	xor	cx, cx
  2140 0000A6E6 66B81008            <1> 	mov	ax, 0810h ; Only directories
  2141 0000A6EA E8B7F6FFFF          <1>         call    locate_current_dir_file
  2142                              <1> 	; EDI = DirBuff Directory Entry Address
  2143 0000A6EF 721F                <1> 	jc short loc_update_parent_dir_lmdt_restore_cdirlevel
  2144                              <1> 
  2145 0000A6F1 E836FEFFFF          <1> 	call	convert_current_date_time
  2146 0000A6F6 66895712            <1> 	mov	[edi+18], dx ; Last Access Date
  2147 0000A6FA 66895718            <1> 	mov	[edi+24], dx ; Last Write Date
  2148 0000A6FE 66894716            <1> 	mov	[edi+22], ax ; Last Write Time
  2149                              <1> 
  2150 0000A702 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2151 0000A709 E8BCFEFFFF          <1> 	call	save_directory_buffer
  2152 0000A70E 7200                <1> 	jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2153                              <1> 	;xor	al, al 
  2154                              <1> loc_update_parent_dir_lmdt_restore_cdirlevel:
  2155                              <1>  	;current directory level restoration
  2156 0000A710 8A25[484D0100]      <1> 	mov	ah, [UPDLMDT_CDirLevel]
  2157 0000A716 8825[A4420100]      <1> 	mov	[Current_Dir_Level], ah
  2158 0000A71C 8B15[494D0100]      <1>         mov     edx, [UPDLMDT_CDirFCluster]
  2159 0000A722 8915[A0420100]      <1> 	mov	[Current_Dir_FCluster], edx
  2160                              <1> 
  2161 0000A728 5E                  <1> 	pop	esi ; *
  2162 0000A729 C3                  <1> 	retn
  2163                              <1> 
  2164                              <1> delete_longname:
  2165                              <1> 	; 27/02/2016 (TRDOS 386 = TRDOS v2.0)
  2166                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_delete_longname')
  2167                              <1> 	; 14/03/2010
  2168                              <1> 	; INPUT ->
  2169                              <1> 	; 	EAX = Directory Entry (Index) Number (< 65536)
  2170                              <1> 	; OUTPUT ->
  2171                              <1> 	;	cf = 0 -> OK  (EAX = 0)
  2172                              <1> 	; 	cf = 1 -> error code in EAX (AL)
  2173                              <1> 	;
  2174                              <1> 	; (Modified registers: EAX, EDX, ECX, EBX, EDI) 
  2175                              <1> 
  2176 0000A72A 66A3[784D0100]      <1> 	mov	[DLN_EntryNumber], ax
  2177 0000A730 C605[7A4D0100]40    <1>         mov     byte [DLN_40h], 40h
  2178                              <1> 
  2179 0000A737 E858000000          <1> 	call	locate_current_dir_entry
  2180 0000A73C 7308                <1> 	jnc	short loc_dln_check_attributes
  2181 0000A73E C3                  <1> 	retn
  2182                              <1> 
  2183                              <1> loc_dln_longname_not_found:
  2184 0000A73F B802000000          <1> 	mov	eax, 2
  2185 0000A744 F9                  <1> 	stc
  2186 0000A745 C3                  <1> 	retn
  2187                              <1> 
  2188                              <1> loc_dln_check_attributes:
  2189 0000A746 B00F                <1> 	mov	al, 0Fh  ; long name
  2190 0000A748 8A670B              <1> 	mov	ah, [edi+0Bh] ; dir entry attributes
  2191 0000A74B 38C4                <1> 	cmp	ah, al
  2192 0000A74D 75F0                <1> 	jne	short loc_dln_longname_not_found
  2193 0000A74F 8A27                <1> 	mov	ah, [edi]
  2194 0000A751 2A25[7A4D0100]      <1> 	sub	ah, [DLN_40h]
  2195 0000A757 76E6                <1> 	jna	short loc_dln_longname_not_found         
  2196 0000A759 80FC14              <1> 	cmp	ah, 14h ; 84-64=20 -> 20*13=260 bytes
  2197 0000A75C 77E1                <1> 	ja	short loc_dln_longname_not_found
  2198                              <1>              
  2199 0000A75E C607E5              <1> 	mov	byte [edi], 0E5h  ; deleted sign
  2200 0000A761 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; changed/write sign
  2201 0000A768 C605[7A4D0100]00    <1> 	mov	byte [DLN_40h], 0 ; 40h -> 0
  2202                              <1> 	  
  2203                              <1> loc_dln_delete_next_ln_entry:
  2204 0000A76F 80FC01              <1> 	cmp	ah, 1
  2205 0000A772 7616                <1> 	jna	short loc_dln_longname_retn
  2206                              <1> loc_dln_delete_next_ln_entry_0:
  2207 0000A774 66FF05[784D0100]    <1> 	inc	word [DLN_EntryNumber]
  2208 0000A77B 0FB705[784D0100]    <1> 	movzx	eax, word [DLN_EntryNumber] 
  2209 0000A782 E80D000000          <1> 	call	locate_current_dir_entry
  2210 0000A787 73BD                <1> 	jnc	short loc_dln_check_attributes
  2211                              <1> 
  2212                              <1> loc_dln_longname_stc_retn:
  2213 0000A789 C3                  <1> 	retn 
  2214                              <1> 	   
  2215                              <1> loc_dln_longname_retn:
  2216                              <1> 	;cmp	byte [DirBuff_ValidData], 2
  2217                              <1> 	;jne	short loc_dln_longname_retn_xor_eax
  2218 0000A78A E83BFEFFFF          <1> 	call	save_directory_buffer
  2219 0000A78F 72F8                <1> 	jc	short loc_dln_longname_stc_retn
  2220                              <1> 
  2221                              <1> loc_dln_longname_retn_xor_eax:
  2222 0000A791 31C0                <1> 	xor	eax, eax
  2223 0000A793 C3                  <1> 	retn
  2224                              <1> 
  2225                              <1> locate_current_dir_entry:
  2226                              <1> 	; 16/10/2016
  2227                              <1> 	; 15/10/2016
  2228                              <1> 	; 23/03/2016
  2229                              <1> 	; 27/02/2016 (TRDOS 386 = TRDOS v2.0)
  2230                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_locate_current_dir_entry')
  2231                              <1> 	; 07/03/2010
  2232                              <1> 	; INPUT ->
  2233                              <1> 	;	EAX = Directory Entry (Index) Number (< 65536) 
  2234                              <1> 	; OUTPUT ->
  2235                              <1> 	;	EDI = Directory Entry Address
  2236                              <1> 	; 	EAX = Cluster Number of Directory Buffer
  2237                              <1> 	;	EBX = Directory Buffer Entry Offset
  2238                              <1> 	;	ECX = DirBuff Valid Data identifier (CL)
  2239                              <1> 	;   	If CF = 0 and CL = 2 then
  2240                              <1> 	;	   directory buffer modified and
  2241                              <1> 	;	   must be written to disk.
  2242                              <1> 	; 	If CF = 0  and CL = 1 then
  2243                              <1> 	;	   dir buffer has been written to disk, already.
  2244                              <1> 	;	CF = 1 -> Error code in EAX (AL)
  2245                              <1> 	;
  2246                              <1> 	; (Modified registers: EAX, EDX, ECX, EBX, EDI) 
  2247                              <1> 
  2248                              <1> loc_locate_current_dir_entry:
  2249 0000A794 56                  <1> 	push	esi
  2250 0000A795 89C1                <1> 	mov	ecx, eax
  2251 0000A797 BA20000000          <1> 	mov	edx, 32
  2252 0000A79C F7E2                <1> 	mul	edx 
  2253 0000A79E A3[844D0100]        <1> 	mov	[LCDE_ByteOffset], eax
  2254 0000A7A3 31DB                <1> 	xor	ebx, ebx
  2255 0000A7A5 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  2256 0000A7AB A0[CE4A0100]        <1>         mov     al, [DirBuff_DRV]
  2257 0000A7B0 2C41                <1> 	sub	al, 'A'
  2258 0000A7B2 BE00010900          <1>         mov     esi, Logical_DOSDisks
  2259 0000A7B7 01DE                <1> 	add	esi, ebx
  2260 0000A7B9 38C7                <1> 	cmp	bh, al
  2261 0000A7BB 0F8592000000        <1>         jne     loc_lcde_reload_current_directory
  2262                              <1> loc_lcde_cdl_check:
  2263 0000A7C1 803D[A4420100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2264 0000A7C8 772A                <1> 	ja	short loc_lcde_calc_dirbuff_cluster_offset
  2265                              <1> 	; 27/02/2016
  2266                              <1> 	; TRDOS v1 has bug here for FAT32 fs !
  2267                              <1> 	; (Root Directory Entries for FAT32 = 0)
  2268 0000A7CA 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2269 0000A7CE 7324                <1> 	jnb	short loc_lcde_calc_dirbuff_cluster_offset
  2270                              <1> 
  2271                              <1> loc_lcde_cdl_check_FAT12_16:
  2272 0000A7D0 668B4617            <1> 	mov	ax, [esi+LD_BPB+RootDirEnts]
  2273 0000A7D4 6648                <1> 	dec	ax
  2274                              <1> 	;xor	dx, dx  
  2275 0000A7D6 6639C8              <1> 	cmp	ax, cx ; cx = Directory Entry (Index) Number
  2276 0000A7D9 720E                <1> 	jb	short loc_lcde_stc_12h_retn
  2277 0000A7DB 66890D[7C4D0100]    <1> 	mov	[LCDE_EntryIndex], cx
  2278 0000A7E2 31C0                <1> 	xor	eax, eax
  2279 0000A7E4 E993000000          <1>         jmp     loc_lcde_check_dir_buffer_cluster
  2280                              <1> 
  2281                              <1> loc_lcde_stc_12h_retn:
  2282 0000A7E9 5E                  <1> 	pop	esi
  2283 0000A7EA 89CB                <1> 	mov	ebx, ecx
  2284 0000A7EC 89D1                <1> 	mov	ecx, edx
  2285                              <1> 	; 16/10/2016 (12h -> 12)
  2286 0000A7EE B80C000000          <1> 	mov	eax, 12 ; No more files
  2287 0000A7F3 C3                  <1> 	retn 
  2288                              <1> 
  2289                              <1> loc_lcde_calc_dirbuff_cluster_offset:
  2290 0000A7F4 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2291 0000A7F7 30FF                <1> 	xor	bh, bh
  2292 0000A7F9 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  2293 0000A7FD 66F7E3              <1> 	mul	bx
  2294 0000A800 6609D2              <1>  	or	dx, dx ; If bytes per cluster > 32KB it is invalid
  2295 0000A803 755D                <1> 	jnz	short loc_lcde_invalid_format
  2296                              <1> 	;mov	ecx, eax
  2297 0000A805 6689C1              <1> 	mov	cx, ax ; BYTES PER CLUSTER
  2298 0000A808 A1[844D0100]        <1> 	mov	eax, [LCDE_ByteOffset]
  2299                              <1> 	;sub	edx, edx
  2300 0000A80D F7F1                <1> 	div	ecx
  2301 0000A80F 3DFFFF0000          <1> 	cmp	eax, 65535
  2302 0000A814 774C                <1> 	ja	short loc_lcde_invalid_format
  2303                              <1> 
  2304                              <1> 	; cluster sequence number of directory (< 65536)
  2305 0000A816 66A3[7E4D0100]      <1> 	mov	[LCDE_ClusterSN], ax 
  2306                              <1> 
  2307 0000A81C 6689D0              <1> 	mov	ax, dx ; byte offset in cluster (directory buffer)
  2308 0000A81F 66BB2000            <1> 	mov	bx, 32 ; ; 1 dir entry = 32 bytes
  2309 0000A823 6629D2              <1>         sub     dx, dx  ; 0
  2310 0000A826 66F7F3              <1> 	div	bx 
  2311 0000A829 66A3[7C4D0100]      <1> 	mov	[LCDE_EntryIndex], ax ; dir entry index/sequence number
  2312                              <1> 				      ; (in directory buffer/cluster)	  
  2313                              <1> loc_lcde_get_current_sub_dir_fcluster:
  2314 0000A82F A1[A0420100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2315                              <1> 
  2316                              <1> loc_lcde_get_next_cluster:
  2317 0000A834 66833D[7E4D0100]00  <1> 	cmp	word [LCDE_ClusterSN], 0
  2318 0000A83C 763E                <1> 	jna	short loc_lcde_check_dir_buffer_cluster
  2319 0000A83E A3[804D0100]        <1> 	mov	[LCDE_Cluster], eax
  2320 0000A843 E835100000          <1> 	call	get_next_cluster
  2321 0000A848 7220                <1> 	jc	short loc_lcde_check_gnc_error
  2322 0000A84A 66FF0D[7E4D0100]    <1>   	dec	word [LCDE_ClusterSN]
  2323 0000A851 EBE1                <1> 	jmp	short loc_lcde_get_next_cluster
  2324                              <1> 
  2325                              <1> loc_lcde_reload_current_directory:
  2326 0000A853 51                  <1> 	push	ecx
  2327 0000A854 E812F6FFFF          <1> 	call	reload_current_directory
  2328 0000A859 59                  <1> 	pop	ecx
  2329 0000A85A 0F8361FFFFFF        <1>         jnc     loc_lcde_cdl_check
  2330 0000A860 5E                  <1> 	pop	esi
  2331 0000A861 C3                  <1> 	retn
  2332                              <1> 
  2333                              <1> loc_lcde_invalid_format:
  2334                              <1> 	; 15/10/2016 (0Bh -> 28)
  2335 0000A862 B81C000000          <1> 	mov	eax, 28 ; Invalid Format !
  2336                              <1> loc_lcde_drive_not_ready_read_err:
  2337 0000A867 F9                  <1> 	stc
  2338 0000A868 5E                  <1> 	pop	esi 
  2339 0000A869 C3                  <1> 	retn  
  2340                              <1> 
  2341                              <1> loc_lcde_check_gnc_error:
  2342 0000A86A 09C0                <1> 	or	eax, eax
  2343 0000A86C 75F9                <1> 	jnz	short loc_lcde_drive_not_ready_read_err
  2344 0000A86E 66FF0D[7E4D0100]    <1> 	dec	word [LCDE_ClusterSN]
  2345 0000A875 75EB                <1> 	jnz	short loc_lcde_invalid_format 
  2346 0000A877 A1[804D0100]        <1> 	mov	eax, [LCDE_Cluster]
  2347                              <1> 
  2348                              <1> loc_lcde_check_dir_buffer_cluster:
  2349 0000A87C 3B05[D54A0100]      <1> 	cmp	eax, [DirBuff_Cluster]
  2350 0000A882 755C                <1> 	jne	short loc_lcde_load_dir_cluster
  2351 0000A884 803D[D04A0100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
  2352 0000A88B 7727                <1> 	ja	short lcde_check_dir_buffer_cluster_next
  2353 0000A88D 803D[A4420100]00    <1> 	cmp	byte [Current_Dir_Level], 0    
  2354 0000A894 775F                <1> 	ja	short loc_lcde_load_dir_cluster_0
  2355                              <1> 	; 27/02/2016
  2356                              <1> 	; TRDOS v1 has bug here for FAT32 fs !
  2357 0000A896 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2358 0000A89A 7359                <1> 	jnb	short loc_lcde_load_dir_cluster_0
  2359                              <1> 	;
  2360 0000A89C 0FB74E17            <1> 	movzx	ecx, word [esi+LD_BPB+RootDirEnts]
  2361 0000A8A0 6683C10F            <1> 	add	cx, 15 ; round up (16 entries per sector)
  2362 0000A8A4 66C1E904            <1> 	shr	cx, 4 ; 1 sector contains 16 dir entries	
  2363                              <1> 
  2364 0000A8A8 8B4664              <1>         mov     eax, [esi+LD_ROOTBegin]
  2365 0000A8AB EB54                <1> 	jmp	short loc_lcde_load_dir_cluster_1 
  2366                              <1> 
  2367                              <1> loc_lcde_validate_dirBuff:
  2368 0000A8AD C605[D04A0100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2369                              <1> 
  2370                              <1> lcde_check_dir_buffer_cluster_next:
  2371 0000A8B4 0FB71D[7C4D0100]    <1> 	movzx	ebx, word [LCDE_EntryIndex]
  2372 0000A8BB 663B1D[D34A0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2373 0000A8C2 779E                <1> 	ja	short loc_lcde_invalid_format 
  2374 0000A8C4 B820000000          <1> 	mov	eax, 32
  2375 0000A8C9 F7E3                <1> 	mul	ebx
  2376                              <1> 	;or	edx, edx
  2377                              <1> 	;jnz	short loc_lcde_invalid_format
  2378                              <1> 
  2379 0000A8CB BF00000800          <1> 	mov	edi, Directory_Buffer  
  2380 0000A8D0 01C7                <1> 	add	edi, eax ; add entry offset to buffer address
  2381                              <1> 
  2382                              <1> loc_lcde_dir_buffer_last_check:
  2383 0000A8D2 A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2384 0000A8D7 0FB60D[D04A0100]    <1> 	movzx	ecx, byte [DirBuff_ValidData]
  2385                              <1> 
  2386                              <1> loc_lcde_retn:
  2387 0000A8DE 5E                  <1> 	pop	esi
  2388 0000A8DF C3                  <1> 	retn
  2389                              <1> 
  2390                              <1> loc_lcde_load_dir_cluster:
  2391                              <1> 	;cmp	byte [DirBuff_ValidData], 2
  2392                              <1> 	;jne	short loc_lcde_load_dir_cluster_n2
  2393 0000A8E0 50                  <1> 	push	eax
  2394 0000A8E1 E8E4FCFFFF          <1> 	call	save_directory_buffer
  2395 0000A8E6 58                  <1> 	pop	eax
  2396 0000A8E7 72F5                <1> 	jc	short loc_lcde_retn
  2397                              <1> 
  2398                              <1> loc_lcde_load_dir_cluster_n2:
  2399 0000A8E9 C605[D04A0100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2400 0000A8F0 A3[D54A0100]        <1> 	mov	[DirBuff_Cluster], eax
  2401                              <1> 
  2402                              <1> loc_lcde_load_dir_cluster_0:
  2403 0000A8F5 83E802              <1> 	sub	eax, 2
  2404 0000A8F8 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  2405 0000A8FC F7E1                <1> 	mul	ecx
  2406 0000A8FE 034668              <1>         add     eax, [esi+LD_DATABegin]
  2407                              <1> 
  2408                              <1> loc_lcde_load_dir_cluster_1:
  2409 0000A901 BB00000800          <1> 	mov	ebx, Directory_Buffer
  2410                              <1> 	; ecx = sector count
  2411 0000A906 E8DE470000          <1> 	call	disk_read
  2412 0000A90B 73A0                <1> 	jnc	short loc_lcde_validate_dirBuff
  2413                              <1> 
  2414                              <1> 	; 15/10/2016 
  2415                              <1> 	; (Disk read error instead of drv not ready err)
  2416 0000A90D B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
  2417 0000A912 EBCA                <1> 	jmp	short loc_lcde_retn
  2418                              <1> 
  2419                              <1> 
  2420                              <1> remove_file:
  2421                              <1> 	; 15/10/2016
  2422                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  2423                              <1> 	; 10/04/2011 (FILE.ASM, 'proc_delete_file')
  2424                              <1> 	; 09/08/2010
  2425                              <1> 	; INPUT ->
  2426                              <1> 	;	EDI = Directory Buffer Entry Address
  2427                              <1> 	;	 CX = Directory Buffer Entry Counter/Index
  2428                              <1> 	;	 BL = Longname Entry Length
  2429                              <1> 	;	 BH = Logical DOS Drive Number 
  2430                              <1> 
  2431 0000A914 29C0                <1> 	sub	eax, eax
  2432 0000A916 88FC                <1> 	mov	ah, bh
  2433 0000A918 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2434 0000A91D 01C6                <1> 	add	esi, eax
  2435                              <1> 
  2436 0000A91F 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2437 0000A923 7312                <1> 	jnb	short loc_del_fat_file 
  2438                              <1>               
  2439 0000A925 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  2440 0000A929 7406                <1> 	je	short loc_del_fs_file
  2441                              <1> 
  2442                              <1> loc_del_file_invalid_format:
  2443 0000A92B 30E4                <1> 	xor	ah, ah
  2444                              <1> 	; 15/10/2016 (0Bh -> 28)
  2445 0000A92D B01C                <1> 	mov	al, 28  ; Invalid Format
  2446 0000A92F F9                  <1> 	stc 
  2447 0000A930 C3                  <1> 	retn
  2448                              <1> 
  2449                              <1> loc_del_fs_file:
  2450 0000A931 E8400F0000          <1> 	call	delete_fs_file
  2451 0000A936 C3                  <1> 	retn
  2452                              <1> 
  2453                              <1> loc_del_fat_file:
  2454 0000A937 E808000000          <1> 	call	delete_directory_entry
  2455 0000A93C 7205                <1> 	jc	short loc_del_file_err_retn 
  2456                              <1> 
  2457                              <1> loc_delfile_unlink_cluster_chain:
  2458 0000A93E E864170000          <1> 	call	truncate_cluster_chain
  2459                              <1> 	;jc	short loc_del_file_err_retn
  2460                              <1> 
  2461                              <1> loc_delfile_return:
  2462                              <1> loc_del_file_err_retn:
  2463 0000A943 C3                  <1> 	retn
  2464                              <1> 
  2465                              <1> delete_directory_entry:
  2466                              <1> 	; 15/10/2016
  2467                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  2468                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_delete_directory_entry')
  2469                              <1> 	; 10/04/2011 
  2470                              <1> 	; INPUT ->
  2471                              <1> 	; 	ESI = Logical Dos Drive Descripton Table Address 
  2472                              <1> 	;	EDI = Directory Buffer Entry Address
  2473                              <1> 	;	 CX = Directory Buffer Entry Counter/Index
  2474                              <1> 	;	 BL = Longname Entry Length
  2475                              <1> 	; OUTPUT ->
  2476                              <1> 	; 	ESI = Logical dos drive descripton table address 
  2477                              <1> 	;	EAX = First cluster to be truncated/unlinked
  2478                              <1> 	;       CF = 1 -> Error code in EAX (AL)
  2479                              <1> 	;       CF = 0 & BH <> 0 -> LMDT write error  (BH = 1)
  2480                              <1> 	;       CF = 0 & BL <> 0 -> Long name delete error (BL = FFh) 
  2481                              <1> 	;
  2482                              <1> 	;  (EDI, EBX, ECX register contents will be changed)
  2483                              <1> 
  2484 0000A944 881D[124D0100]      <1> 	mov	[DelFile_LNEL], bl
  2485 0000A94A 66890D[104D0100]    <1> 	mov	[DelFile_EntryCounter], cx
  2486                              <1> 
  2487 0000A951 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  2488 0000A955 C1E010              <1> 	shl	eax, 16
  2489 0000A958 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  2490                              <1> 
  2491 0000A95C A3[0C4D0100]        <1> 	mov	[DelFile_FCluster], eax
  2492                              <1> 
  2493                              <1> loc_del_short_name:
  2494 0000A961 C607E5              <1> 	mov	byte [edi], 0E5h  ; Deleted sign
  2495                              <1> 
  2496 0000A964 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2497 0000A96B E85AFCFFFF          <1> 	call	save_directory_buffer
  2498 0000A970 723D                <1> 	jc	short loc_delete_direntry_err_return
  2499                              <1>  
  2500                              <1> loc_del_long_name:
  2501 0000A972 0FB615[124D0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2502 0000A979 08D2                <1> 	or	dl, dl
  2503 0000A97B 7416                <1> 	jz	short loc_del_dir_entry_update_parent_dir_lm_date
  2504                              <1> 
  2505 0000A97D 8835[124D0100]      <1> 	mov	byte [DelFile_LNEL], dh ; 0              
  2506                              <1>   
  2507 0000A983 0FB705[104D0100]    <1> 	movzx	eax,  word [DelFile_EntryCounter]
  2508 0000A98A 29D0                <1> 	sub	eax, edx
  2509                              <1> 	;jnc	short loc_del_long_name_continue
  2510 0000A98C 7205                <1> 	jc	short loc_del_dir_entry_update_parent_dir_lm_date   
  2511                              <1> 
  2512                              <1> ;loc_del_direntry_inv_data_return: ; 15/10/2016 (0Dh -> 29)
  2513                              <1> ;	mov	eax, 29 ; 0Dh (TRDOS 8086) ; Invalid data
  2514                              <1> ;	retn
  2515                              <1> 
  2516                              <1> loc_del_long_name_continue: 
  2517                              <1> 	; AX = Directory Entry Number of the long name last entry
  2518 0000A98E E897FDFFFF          <1> 	call	delete_longname
  2519                              <1> 	;jc	short loc_delete_direntry_err_return
  2520                              <1> 
  2521                              <1> loc_del_dir_entry_update_parent_dir_lm_date:
  2522 0000A993 801D[124D0100]00    <1> 	sbb	byte [DelFile_LNEL], 0 ; 0FFh if cf = 1
  2523                              <1> 
  2524 0000A99A E8C6FCFFFF          <1> 	call	update_parent_dir_lmdt
  2525 0000A99F B700                <1> 	mov	bh, 0
  2526 0000A9A1 80D700              <1> 	adc	bh, 0
  2527                              <1> 
  2528 0000A9A4 8A1D[124D0100]      <1> 	mov	bl, byte [DelFile_LNEL]
  2529                              <1>  
  2530                              <1> loc_delete_direntry_return:
  2531 0000A9AA A1[0C4D0100]        <1> 	mov	eax, [DelFile_FCluster]
  2532                              <1> loc_delete_direntry_err_return:
  2533 0000A9AF C3                  <1> 	retn
  2534                              <1> 
  2535                              <1> rename_directory_entry:
  2536                              <1> 	; 15/10/2016
  2537                              <1> 	; 06/03/2016 (TRDOS 386 = TRDOS v2.0)
  2538                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_rename_directory_entry')
  2539                              <1> 	; 19/11/2010
  2540                              <1> 	; INPUT -> (Current Directory)
  2541                              <1> 	;	CX = Directory Entry Number
  2542                              <1> 	;      EAX = First Cluster number of file or directory
  2543                              <1> 	;      EBX = Longname Length (dir entry count) (< 256)
  2544                              <1> 	;      ESI = New file (or directory) name (no path).
  2545                              <1> 	;           (ASCIIZ string)  
  2546                              <1> 	; OUTPUT -> 
  2547                              <1> 	;      CF = 0 -> successfull
  2548                              <1> 	;      CF = 1 -> error code in EAX (AL)
  2549                              <1> 	;
  2550                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2551                              <1> 
  2552 0000A9B0 803D[A5420100]00    <1> 	cmp	byte [Current_FATType], 0
  2553 0000A9B7 7706                <1> 	ja	short loc_rename_directory_entry
  2554                              <1> 
  2555 0000A9B9 E8B90E0000          <1> 	call	rename_fs_file_or_directory
  2556 0000A9BE C3                  <1> 	retn 
  2557                              <1> 	
  2558                              <1> loc_rename_directory_entry:
  2559 0000A9BF 881D[124D0100]      <1> 	mov	[DelFile_LNEL], bl
  2560 0000A9C5 66890D[104D0100]    <1> 	mov	[DelFile_EntryCounter], cx
  2561 0000A9CC A3[0C4D0100]        <1> 	mov	[DelFile_FCluster], eax
  2562                              <1> 
  2563 0000A9D1 0FB7C1              <1> 	movzx	eax, cx
  2564 0000A9D4 E8BBFDFFFF          <1> 	call	locate_current_dir_entry
  2565 0000A9D9 7308                <1> 	jnc	short loc_rename_direntry_check_fcluster
  2566                              <1> 
  2567                              <1> loc_rename_direntry_pop_retn:
  2568 0000A9DB C3                  <1> 	retn
  2569                              <1> 
  2570                              <1> loc_rename_direntry_pop_invd_retn:
  2571 0000A9DC F9                  <1> 	stc
  2572                              <1> loc_rename_direntry_invd_retn:
  2573                              <1> 	; 15/10/2016 (0Dh -> 29)
  2574 0000A9DD B81D000000          <1> 	mov	eax, 29 ; Invalid data
  2575                              <1> loc_rename_retn:
  2576 0000A9E2 C3                  <1> 	retn 
  2577                              <1> 
  2578                              <1> loc_rename_direntry_check_fcluster:
  2579 0000A9E3 668B5714            <1> 	mov	dx, [edi+20] ; First Cluster HW
  2580 0000A9E7 66C1E210            <1> 	shl	dx, 16
  2581 0000A9EB 668B571A            <1> 	mov	dx, [edi+26] ; First Cluster LW
  2582 0000A9EF 3B15[0C4D0100]      <1> 	cmp	edx, [DelFile_FCluster]
  2583 0000A9F5 75E5                <1> 	jne	short loc_rename_direntry_pop_invd_retn
  2584                              <1> 	; ESI = New file (or directory) name. (ASCIIZ string)
  2585                              <1> 	; 06/03/2016
  2586                              <1> 	; TRDOS v2 - NOTE: 'convert_file_name' procedure
  2587                              <1> 	; has been modified for eliminating following situation.
  2588                              <1> 	; 
  2589                              <1> 	; TRDOS v1 - NOTE: If file/dir name is more than 11 bytes
  2590                              <1> 	; without a dot, attributes (edi+11) byte will be overwritten !
  2591                              <1> 	; (Dot file name input must be proper for 11 byte dir entry
  2592                              <1> 	;  type file name output.) 
  2593 0000A9F7 E89FF6FFFF          <1> 	call	convert_file_name
  2594                              <1> 
  2595 0000A9FC C605[D04A0100]02    <1>         mov     byte [DirBuff_ValidData], 2
  2596 0000AA03 E8C2FBFFFF          <1> 	call	save_directory_buffer
  2597 0000AA08 72D8                <1> 	jc	short loc_rename_retn
  2598                              <1> 
  2599                              <1> loc_rename_direntry_del_ln:
  2600 0000AA0A 0FB615[124D0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2601 0000AA11 08D2                <1> 	or	dl, dl
  2602 0000AA13 7410                <1> 	jz	short loc_rename_direntry_update_parent_dir_lm_date
  2603                              <1> 
  2604 0000AA15 0FB705[104D0100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  2605 0000AA1C 29D0                <1> 	sub	eax, edx
  2606 0000AA1E 72BD                <1> 	jc	short loc_rename_direntry_invd_retn
  2607                              <1> 
  2608                              <1> loc_rename_direntry_del_ln_continue: 
  2609                              <1> 	; EAX = Directory Entry Number of the long name last entry
  2610 0000AA20 E805FDFFFF          <1> 	call	delete_longname
  2611                              <1> 
  2612                              <1> loc_rename_direntry_update_parent_dir_lm_date:
  2613 0000AA25 E83BFCFFFF          <1> 	call	update_parent_dir_lmdt
  2614 0000AA2A 31C0                <1> 	xor	eax, eax 
  2615 0000AA2C C3                  <1> 	retn
  2616                              <1> 
  2617                              <1> move_source_file_to_destination_file:
  2618                              <1> 	; 15/10/2016
  2619                              <1> 	; 11/03/2016
  2620                              <1> 	; 10/03/2016 (TRDOS 386 = TRDOS v2.0)
  2621                              <1> 	; 01/08/2011 (FILE.ASM)
  2622                              <1> 	; 04/08/2010
  2623                              <1> 	;
  2624                              <1> 	;   Phase 1 -> Check destination file, 
  2625                              <1> 	;              'not found' is required
  2626                              <1> 	;   Phase 2 -> Check source file
  2627                              <1> 	;              'found' and proper attributes is required
  2628                              <1> 	;   Phase 3 -> Make destination directory entry,
  2629                              <1> 	;           add new dir cluster or section if it is required
  2630                              <1> 	;   Phase 4 -> Delete source directory entry.
  2631                              <1> 	;       cf = 1 causes to return before the phase 4.
  2632                              <1> 	;    (source file protection against any possible errors)    
  2633                              <1> 	;
  2634                              <1> 	; 08/05/2011 major modification
  2635                              <1> 	;            -> destination file deleting is removed   
  2636                              <1> 	;            for msdos move/rename compatibility.
  2637                              <1> 	;            (Access denied error will return if
  2638                              <1> 	;            the destination file is found...)
  2639                              <1> 	; INPUT ->
  2640                              <1> 	;	 ESI = Source File Pathname (Asciiz)
  2641                              <1> 	;        EDI = Destination File Pathname (Asciiz)
  2642                              <1> 	;        AL = 0 --> Interrupt (System call)
  2643                              <1> 	;        AL > 0 --> Command Interpreter (Question)
  2644                              <1> 	;        AL = 1 --> Question Phase
  2645                              <1> 	;        AL = 2 --> Progress Phase        
  2646                              <1> 	; OUTPUT -> 
  2647                              <1> 	;	 cf = 0 -> OK
  2648                              <1> 	;        EAX = Destination directory first cluster
  2649                              <1> 	;        ESI = Logical DOS drive description table 
  2650                              <1> 	;        EBX = Destination file structure offset
  2651                              <1> 	;        CX = 0 (CX > 0 --> calculate free space error)
  2652                              <1> 	;        cf = 1 -> Error code in EAX (AL) 
  2653                              <1> 	;
  2654                              <1> 	;  (EDX, ECX, EBX, ESI, EDI will be changed)
  2655                              <1> 
  2656 0000AA2D 3C02                <1> 	cmp	al, 2
  2657 0000AA2F 0F847F010000        <1> 	je	msftdf_df2_check_directory
  2658 0000AA35 A2[924E0100]        <1> 	mov	[move_cmd_phase], al
  2659                              <1> 
  2660                              <1> msftdf_parse_sf_path:
  2661                              <1> 	; ESI = ASCIIZ pathname (Source)
  2662 0000AA3A 57                  <1> 	push	edi 
  2663 0000AA3B BF[904D0100]        <1> 	mov	edi, SourceFile_Drv
  2664 0000AA40 E821F7FFFF          <1> 	call	parse_path_name
  2665 0000AA45 5E                  <1> 	pop	esi
  2666 0000AA46 7211                <1> 	jc	short msftdf_psf_retn
  2667                              <1> 
  2668                              <1> msftdf_parse_df_path:
  2669                              <1> 	; ESI = ASCIIZ pathname	(Destination)
  2670 0000AA48 BF[104E0100]        <1> 	mov	edi, DestinationFile_Drv
  2671 0000AA4D E814F7FFFF          <1> 	call	parse_path_name
  2672 0000AA52 7306                <1> 	jnc	short msftdf_check_sf_drv
  2673                              <1> 
  2674 0000AA54 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  2675 0000AA56 7602                <1> 	jna	short msftdf_check_sf_drv
  2676                              <1> 
  2677                              <1> msftdf_stc_retn:
  2678 0000AA58 F9                  <1> 	stc
  2679                              <1> msftdf_psf_retn:
  2680 0000AA59 C3                  <1> 	retn 
  2681                              <1> 
  2682                              <1> msftdf_check_sf_drv:
  2683 0000AA5A A0[904D0100]        <1> 	mov	al, [SourceFile_Drv]
  2684                              <1> 
  2685                              <1> msftdf_check_df_drv:
  2686 0000AA5F 8A15[104E0100]      <1> 	mov	dl, [DestinationFile_Drv]
  2687                              <1> 
  2688                              <1> msftdf_compare_sf_df_drv:
  2689 0000AA65 29DB                <1> 	sub	ebx, ebx
  2690 0000AA67 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  2691 0000AA6D 38C2                <1> 	cmp	dl, al
  2692 0000AA6F 7409                <1> 	je	short msftdf_check_sf_df_drv_ok
  2693                              <1> 
  2694                              <1> msftdf_not_same_drv:
  2695                              <1>         ; DL = source file's drive number
  2696 0000AA71 88C6                <1> 	mov	dh, al ; destination file's drive number
  2697                              <1> 	; 15/10/2016 (11h -> 21)
  2698 0000AA73 B815000000          <1> 	mov	eax, 21 ; Not the same drive
  2699 0000AA78 F9                  <1> 	stc
  2700 0000AA79 C3                  <1> 	retn 
  2701                              <1> 
  2702                              <1> msftdf_check_sf_df_drv_ok:
  2703 0000AA7A 8815[934E0100]      <1> 	mov	[msftdf_sf_df_drv], dl
  2704                              <1> 
  2705 0000AA80 29C0                <1>         sub	eax, eax
  2706 0000AA82 88D4                <1> 	mov	ah, dl
  2707 0000AA84 0500010900          <1> 	add	eax, Logical_DOSDisks
  2708 0000AA89 A3[944E0100]        <1> 	mov	[msftdf_drv_offset], eax
  2709                              <1> 
  2710 0000AA8E 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  2711 0000AA90 7407                <1> 	je	short msftdf_df_check_directory
  2712                              <1> 
  2713                              <1> msftdf_change_drv:
  2714 0000AA92 E826C1FFFF          <1> 	call 	change_current_drive
  2715 0000AA97 726D                <1> 	jc	short msftdf_df_error_retn
  2716                              <1> 	  
  2717                              <1> msftdf_check_destination_file:
  2718                              <1> msftdf_df_check_directory:
  2719 0000AA99 BE[114E0100]        <1> 	mov	esi, DestinationFile_Directory
  2720 0000AA9E 803E20              <1> 	cmp	byte [esi], 20h
  2721 0000AAA1 760F                <1> 	jna	short msftdf_df_find_1
  2722                              <1> 
  2723                              <1> msftdf_df_change_directory:
  2724 0000AAA3 FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  2725 0000AAA9 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2726 0000AAAB E8A2F0FFFF          <1> 	call	change_current_directory
  2727 0000AAB0 7254                <1> 	jc	short msftdf_df_error_retn
  2728                              <1> 
  2729                              <1> ;msftdf_df_change_prompt_dir_string:
  2730                              <1> ;	call 	change_prompt_dir_string
  2731                              <1> 
  2732                              <1> msftdf_df_find_1:
  2733 0000AAB2 BE[524E0100]        <1>         mov     esi, DestinationFile_Name
  2734 0000AAB7 803E20              <1> 	cmp	byte [esi], 20h
  2735 0000AABA 7631                <1> 	jna	short msftdf_df_copy_sf_name
  2736                              <1> 
  2737                              <1> msftdf_df_find_2:
  2738 0000AABC 6631C0              <1> 	xor	ax, ax ; DestinationFile_AttributesMask -> any/zero
  2739 0000AABF E88BD4FFFF          <1> 	call	find_first_file
  2740 0000AAC4 0F838D000000        <1> 	jnc	msftdf_permission_denied_retn
  2741                              <1> 
  2742                              <1> msftdf_df_check_error_code:
  2743                              <1> 	;cmp	eax, 2 ; File not found error
  2744 0000AACA 3C02                <1> 	cmp	al, 2
  2745 0000AACC 7537                <1> 	jne	short msftdf_df_stc_retn
  2746                              <1>               
  2747                              <1> msftdf_df_check_fname:
  2748                              <1> 	; 15/10/2016
  2749 0000AACE BE[524E0100]        <1> 	mov	esi, DestinationFile_Name ; *
  2750 0000AAD3 E837D8FFFF          <1> 	call	check_filename
  2751 0000AAD8 7307                <1> 	jnc	short msftdf_convert_df_direntry_name
  2752                              <1> 	; invalid file name chars !
  2753 0000AADA B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26
  2754 0000AADF EB24                <1> 	jmp	short msftdf_df_stc_retn
  2755                              <1> 
  2756                              <1> msftdf_convert_df_direntry_name:
  2757                              <1> 	; mov	esi, DestinationFile_Name ; *
  2758 0000AAE1 BF[624E0100]        <1> 	mov	edi, DestinationFile_DirEntry
  2759 0000AAE6 E8B0F5FFFF          <1> 	call	convert_file_name
  2760 0000AAEB EB1A                <1>   	jmp	short msftdf_restore_current_dir_1
  2761                              <1> 
  2762                              <1> msftdf_df_copy_sf_name:
  2763 0000AAED 89F7                <1> 	mov	edi, esi
  2764 0000AAEF 57                  <1> 	push	edi 
  2765 0000AAF0 BE[D24D0100]        <1>         mov     esi, SourceFile_Name
  2766 0000AAF5 B90C000000          <1> 	mov	ecx, 12
  2767                              <1> msftdf_df_copy_sf_name_loop:
  2768 0000AAFA AC                  <1> 	lodsb
  2769 0000AAFB AA                  <1>         stosb
  2770 0000AAFC 08C0                <1> 	or	al, al
  2771 0000AAFE 7402                <1> 	jz	short msftdf_df_copy_sf_name_ok	
  2772 0000AB00 E2F8                <1>         loop    msftdf_df_copy_sf_name_loop
  2773                              <1> msftdf_df_copy_sf_name_ok:	
  2774 0000AB02 5E                  <1> 	pop	esi  
  2775 0000AB03 EBB7                <1> 	jmp	short msftdf_df_find_2
  2776                              <1> 
  2777                              <1> msftdf_df_stc_retn:
  2778 0000AB05 F9                  <1> 	stc
  2779                              <1> msftdf_restore_cdir_failed:
  2780                              <1> msftdf_df_error_retn:
  2781 0000AB06 C3                  <1> 	retn
  2782                              <1> 
  2783                              <1> msftdf_restore_current_dir_1:
  2784 0000AB07 803D[E3FE0000]00    <1> 	cmp	byte [Restore_CDIR], 0
  2785 0000AB0E 760D                <1> 	jna	short msftdf_sf_check_directory
  2786 0000AB10 8B35[944E0100]      <1> 	mov	esi, [msftdf_drv_offset] 
  2787 0000AB16 E859C1FFFF          <1> 	call	restore_current_directory
  2788 0000AB1B 72E9                <1> 	jc	short msftdf_restore_cdir_failed
  2789                              <1> 
  2790                              <1> msftdf_sf_check_directory:
  2791 0000AB1D BE[914D0100]        <1> 	mov	esi, SourceFile_Directory
  2792 0000AB22 803E20              <1> 	cmp	byte [esi], 20h
  2793 0000AB25 760F                <1> 	jna	short msftdf_sf_find
  2794                              <1> msftdf_sf_change_directory:
  2795 0000AB27 FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  2796 0000AB2D 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2797 0000AB2F E81EF0FFFF          <1> 	call	change_current_directory
  2798 0000AB34 7227                <1> 	jc	short msftdf_return
  2799                              <1> 
  2800                              <1> ;msftdf_sf_change_prompt_dir_string:
  2801                              <1> ;	call	change_prompt_dir_string
  2802                              <1> 
  2803                              <1> msftdf_sf_find:
  2804 0000AB36 BE[D24D0100]        <1>         mov     esi, SourceFile_Name  ; Offset 66
  2805 0000AB3B 66B80018            <1> 	mov	ax, 1800h ; Only files
  2806 0000AB3F E80BD4FFFF          <1> 	call	find_first_file
  2807 0000AB44 7217                <1> 	jc	short msftdf_return
  2808                              <1> 
  2809                              <1> msftdf_sf_ambgfn_check:
  2810 0000AB46 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  2811 0000AB49 7407                <1> 	jz	short msftdf_sf_found
  2812                              <1> 
  2813                              <1> msftdf_ambiguous_file_name_error:
  2814 0000AB4B B802000000          <1> 	mov	eax, 2 ; File not found error
  2815 0000AB50 F9                  <1> 	stc
  2816 0000AB51 C3                  <1> 	retn
  2817                              <1> 
  2818                              <1> msftdf_sf_found:
  2819 0000AB52 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  2820 0000AB55 7416                <1> 	jz	short msftdf_save_sf_structure
  2821                              <1> 
  2822                              <1> msftdf_permission_denied_retn:
  2823 0000AB57 B805000000          <1> 	mov	eax, 05h ; Access (Permission) denied !
  2824 0000AB5C F9                  <1> 	stc
  2825                              <1> msftdf_rest_cdir_err_retn:
  2826                              <1> msftdf_return:
  2827 0000AB5D C3                  <1> 	retn
  2828                              <1> 
  2829                              <1> msftdf_phase_1_return:
  2830 0000AB5E 31C0                <1> 	xor	eax, eax
  2831 0000AB60 A2[924E0100]        <1> 	mov	[move_cmd_phase], al ; 0
  2832 0000AB65 FEC0                <1> 	inc	al ; mov al, 1
  2833 0000AB67 BB[B4AB0000]        <1> 	mov	ebx, msftdf_df2_check_directory
  2834                              <1> 	;mov	edx, 0FFFFFFFFh 
  2835 0000AB6C C3                  <1> 	retn
  2836                              <1> 
  2837                              <1> msftdf_save_sf_structure:
  2838 0000AB6D BE[9C4C0100]        <1> 	mov	esi, FindFile_DirEntry
  2839 0000AB72 BF[E24D0100]        <1> 	mov	edi, SourceFile_DirEntry
  2840 0000AB77 B908000000          <1> 	mov	ecx, 8
  2841 0000AB7C F3A5                <1> 	rep	movsd
  2842                              <1> 
  2843                              <1> msftdf_df_copy_sf_parameters:
  2844 0000AB7E BE0B000000          <1> 	mov	esi, 11
  2845 0000AB83 89F7                <1> 	mov	edi, esi
  2846 0000AB85 81C6[E24D0100]      <1> 	add	esi, SourceFile_DirEntry
  2847 0000AB8B 81C7[624E0100]      <1> 	add	edi, DestinationFile_DirEntry
  2848                              <1> 	;mov	ecx, 21
  2849 0000AB91 B115                <1> 	mov	cl, 21
  2850 0000AB93 F3A4                <1> 	rep	movsb
  2851                              <1> 
  2852                              <1> msftdf_restore_current_dir_2:
  2853 0000AB95 803D[E3FE0000]00    <1> 	cmp	byte [Restore_CDIR], 0
  2854 0000AB9C 760D                <1> 	jna	short msftdf_df2_check_move_cmd_phase
  2855 0000AB9E 8B35[944E0100]      <1>  	mov	esi, [msftdf_drv_offset]
  2856 0000ABA4 E8CBC0FFFF          <1> 	call	restore_current_directory
  2857 0000ABA9 72B2                <1> 	jc	short msftdf_rest_cdir_err_retn
  2858                              <1> 
  2859                              <1> msftdf_df2_check_move_cmd_phase:
  2860 0000ABAB 803D[924E0100]01    <1> 	cmp	byte [move_cmd_phase], 1
  2861 0000ABB2 74AA                <1> 	je	short msftdf_phase_1_return
  2862                              <1> 
  2863                              <1> msftdf_df2_check_directory:
  2864 0000ABB4 BE[114E0100]        <1> 	mov	esi, DestinationFile_Directory
  2865 0000ABB9 803E20              <1> 	cmp	byte [esi], 20h
  2866 0000ABBC 760F                <1> 	jna	short msftdf_make_dfde_locate_ffe_on_directory
  2867                              <1> msftdf_df2_change_directory:
  2868 0000ABBE FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  2869 0000ABC4 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2870 0000ABC6 E887EFFFFF          <1> 	call	change_current_directory
  2871 0000ABCB 7290                <1> 	jc	short msftdf_return
  2872                              <1> 
  2873                              <1> ;msftdf_df2_change_prompt_dir_string:
  2874                              <1> ;	call	change_prompt_dir_string
  2875                              <1> 
  2876                              <1> msftdf_make_dfde_locate_ffe_on_directory:
  2877                              <1> 	; Current directory fcluster <> Directory buffer cluster
  2878                              <1> 	; Current directory will be reloaded by
  2879                              <1> 	; 'locate_current_dir_file' procedure
  2880                              <1> 	;
  2881                              <1> 	;xor	ax, ax
  2882 0000ABCD 31C0                <1> 	xor	eax, eax
  2883 0000ABCF 89C1                <1> 	mov	ecx, eax
  2884 0000ABD1 6649                <1> 	dec	cx ; FFFFh  
  2885                              <1> 		; CX = FFFFh -> find first deleted or free entry
  2886                              <1> 		; ESI would be ASCIIZ filename address if the call
  2887                              <1> 		; would not be for first free or deleted dir entry  
  2888 0000ABD3 E8CEF1FFFF          <1> 	call	locate_current_dir_file
  2889 0000ABD8 733F                <1> 	jnc	msftdf_make_dfde_set_ff_dir_entry
  2890                              <1> 	
  2891                              <1> 	;cmp	eax, 2
  2892 0000ABDA 3C02                <1>         cmp	al, 2
  2893 0000ABDC 7537                <1> 	jne	short msftdf_error_retn
  2894                              <1> 
  2895                              <1> msftdf_add_new_dir_entry_check_fs:
  2896 0000ABDE 8B35[944E0100]      <1> 	mov	esi, [msftdf_drv_offset]
  2897 0000ABE4 A1[D54A0100]        <1> 	mov 	eax, [DirBuff_Cluster]
  2898 0000ABE9 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2899 0000ABED 7711                <1> 	ja	short msftdf_add_new_subdir_cluster
  2900                              <1> 
  2901                              <1> msftdf_add_new_fs_subdir_section:
  2902                              <1> 	;CL=0, CH=E5h --> deleted entry, CH=0 --> free entry
  2903                              <1>         ;xor	cx, cx
  2904 0000ABEF 30ED                <1> 	xor	ch, ch ; cx = 0 --> add a new subdir section
  2905 0000ABF1 E8830C0000          <1> 	call	add_new_fs_section
  2906 0000ABF6 721E                <1>         jc	short msftdf_dsfde_error_retn
  2907                              <1> 	;mov	[createfile_LastDirCluster], eax
  2908                              <1> 
  2909 0000ABF8 E8A30E0000          <1> 	call	load_FS_sub_directory 
  2910                              <1> 	;mov	ebx, Directory_Buffer 
  2911 0000ABFD 7318                <1> 	jnc	short msftdf_add_new_fs_subdir_section_ok
  2912 0000ABFF C3                  <1> 	retn	 
  2913                              <1> 
  2914                              <1> msftdf_add_new_subdir_cluster:
  2915 0000AC00 E881150000          <1> 	call	add_new_cluster
  2916 0000AC05 720F                <1> 	jc	short msftdf_dsfde_error_retn
  2917                              <1> 	
  2918                              <1> 	;mov	[createfile_LastDirCluster], eax
  2919                              <1> 
  2920 0000AC07 E8570E0000          <1> 	call	load_FAT_sub_directory
  2921 0000AC0C 7309                <1> 	jnc	short msftdf_add_new_subdir_cluster_ok
  2922                              <1> 	; EBX = Directory buffer address
  2923                              <1> 
  2924                              <1> msftdf_ansdc_update_parent_dir_lmdt:
  2925                              <1> msftdf_make_dfde_err_upd_pdir_lmdt:
  2926 0000AC0E 50                  <1> 	push	eax
  2927 0000AC0F E851FAFFFF          <1> 	call	update_parent_dir_lmdt
  2928 0000AC14 58                  <1> 	pop	eax
  2929                              <1> 
  2930                              <1> msftdf_error_retn:
  2931 0000AC15 F9                  <1> 	stc
  2932                              <1> msftdf_dsfde_restore_cdir_failed:
  2933                              <1> msftdf_dsfde_error_retn:
  2934 0000AC16 C3                  <1> 	retn
  2935                              <1> 
  2936                              <1> msftdf_add_new_fs_subdir_section_ok:
  2937                              <1> msftdf_add_new_subdir_cluster_ok:
  2938 0000AC17 89DF                <1> 	mov	edi, ebx ; Directory buffer address
  2939                              <1> 
  2940                              <1> msftdf_make_dfde_set_ff_dir_entry:
  2941 0000AC19 8B15[A0420100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2942 0000AC1F 8915[F84E0100]      <1> 	mov	[createfile_FFCluster], edx
  2943                              <1> 	; EDI = Directory entry offset
  2944 0000AC25 BE[624E0100]        <1> 	mov	esi, DestinationFile_DirEntry
  2945 0000AC2A B908000000          <1> 	mov	ecx, 8
  2946 0000AC2F F3A5                <1> 	rep	movsd
  2947                              <1> 
  2948 0000AC31 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  2949 0000AC38 E88DF9FFFF          <1> 	call	save_directory_buffer
  2950 0000AC3D 72CF                <1> 	jc	short msftdf_make_dfde_err_upd_pdir_lmdt
  2951                              <1> 
  2952                              <1> msftdf_make_dfde_update_pdir_lmdt:
  2953 0000AC3F E821FAFFFF          <1> 	call	update_parent_dir_lmdt
  2954                              <1> 
  2955                              <1> msftdf_dsfde_restore_current_dir_1:
  2956 0000AC44 803D[E3FE0000]00    <1> 	cmp	byte [Restore_CDIR], 0
  2957 0000AC4B 760D                <1> 	jna	short msftdf_dsfde_check_directory
  2958 0000AC4D 8B35[944E0100]      <1>  	mov	esi, [msftdf_drv_offset]
  2959 0000AC53 E81CC0FFFF          <1> 	call	restore_current_directory
  2960 0000AC58 72BC                <1> 	jc	short msftdf_dsfde_restore_cdir_failed
  2961                              <1> 
  2962                              <1> msftdf_dsfde_check_directory:
  2963 0000AC5A BE[914D0100]        <1> 	mov	esi, SourceFile_Directory
  2964 0000AC5F 803E20              <1> 	cmp	byte [esi], 20h
  2965 0000AC62 760F                <1> 	jna	short msftdf_dsfde_find_file
  2966                              <1> 
  2967                              <1> msftdf_dsfde_change_directory:
  2968 0000AC64 FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  2969 0000AC6A 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  2970 0000AC6C E8E1EEFFFF          <1> 	call	change_current_directory
  2971 0000AC71 72A3                <1> 	jc	short msftdf_dsfde_error_retn
  2972                              <1> 
  2973                              <1> ;msftdf_dsfde_sf_change_prompt_dir_string:
  2974                              <1> ;	call	change_prompt_dir_string
  2975                              <1> 
  2976                              <1> msftdf_dsfde_find_file:
  2977 0000AC73 BE[D24D0100]        <1> 	mov	esi, SourceFile_Name  ; Offset 66
  2978 0000AC78 668B460E            <1> 	mov	ax, [esi+14] ; 80 -> SourceFile_AttributesMask
  2979 0000AC7C E8CED2FFFF          <1> 	call	find_first_file
  2980 0000AC81 7293                <1> 	jc	short msftdf_dsfde_error_retn
  2981                              <1> 
  2982                              <1> msftdf_dsfde_delete_direntry:
  2983 0000AC83 8B35[944E0100]      <1> 	mov	esi, [msftdf_drv_offset]
  2984                              <1> 	
  2985 0000AC89 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2986 0000AC8D 770A                <1> 	ja	short msftdf_delete_FAT_direntry
  2987                              <1> 	
  2988 0000AC8F 30DB                <1> 	xor	bl, bl
  2989                              <1> 	; BL = 0 -> File
  2990                              <1> 	; EDI -> Directory buffer entry offset/address 
  2991 0000AC91 E8E40B0000          <1> 	call	delete_fs_directory_entry
  2992 0000AC96 7315                <1> 	jnc	short msftdf_dsfde_restore_current_dir_2
  2993 0000AC98 C3                  <1> 	retn
  2994                              <1> 
  2995                              <1> msftdf_delete_FAT_direntry:	
  2996 0000AC99 8A1D[994C0100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  2997 0000AC9F 668B0D[C44C0100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  2998                              <1> 	; ESI = Logical DOS drive description table address
  2999                              <1> 	; EDI = Directory buffer entry offset/address 
  3000 0000ACA6 E899FCFFFF          <1> 	call	delete_directory_entry
  3001 0000ACAB 721C                <1> 	jc	short msftdf_retn
  3002                              <1> 
  3003                              <1> msftdf_dsfde_restore_current_dir_2:
  3004 0000ACAD 803D[E3FE0000]00    <1> 	cmp	byte [Restore_CDIR], 0
  3005 0000ACB4 7607                <1> 	jna	short msftdf_new_dir_fcluster_retn
  3006                              <1> 	;mov	esi, [msftdf_drv_offset]
  3007 0000ACB6 E8B9BFFFFF          <1> 	call	restore_current_directory
  3008 0000ACBB 720C                <1> 	jc	short msftdf_retn
  3009                              <1> 
  3010                              <1> msftdf_new_dir_fcluster_retn:
  3011 0000ACBD 31C9                <1> 	xor	ecx, ecx 
  3012 0000ACBF A1[F84E0100]        <1> 	mov	eax, [createfile_FFCluster]
  3013 0000ACC4 BB[104E0100]        <1> 	mov	ebx, DestinationFile_Drv
  3014                              <1> 
  3015                              <1> msftdf_retn:
  3016 0000ACC9 C3                  <1> 	retn
  3017                              <1> 
  3018                              <1> 
  3019                              <1> copy_source_file_to_destination_file:
  3020                              <1> 	; 17/10/2016
  3021                              <1> 	; 16/10/2016
  3022                              <1> 	; 15/10/2016
  3023                              <1> 	; 30/03/2016, 31/03/2016
  3024                              <1> 	; 24/03/2016, 25/03/2016, 28/03/2016
  3025                              <1> 	; 21/03/2016, 22/03/2016, 23/03/2016
  3026                              <1> 	; 16/03/2016, 17/03/2016, 18/03/2016
  3027                              <1> 	; 15/03/2016 (TRDOS 386 = TRDOS v2.0)
  3028                              <1> 	; 02/09/2011 (FILE.ASM 'copy_source_file_to_destination_file')
  3029                              <1> 	; 01/08/2010 - 18/05/2011
  3030                              <1> 	;
  3031                              <1> 	;   Command Interpreter phase 1 enter ->
  3032                              <1> 	;           AL = 1 -> Caller is command interpreter
  3033                              <1> 	;           AL = 2 -> The second call, re-enter/continue
  3034                              <1> 	;   Phase 1 -> Check source file
  3035                              <1> 	;              'found' is required
  3036                              <1> 	;   Phase 2 -> Check destination file, 
  3037                              <1> 	;              save 'found' or 'not found' status
  3038                              <1> 	;              'permission denied' error will be return
  3039                              <1> 	;              if attributes have not for ordinary file 
  3040                              <1> 	;              without readonly attribute
  3041                              <1> 	;   Command Interpreter phase 1 return ->
  3042                              <1> 	;              DH = Source file attributes
  3043                              <1> 	;              DL = Destination file found status
  3044                              <1> 	;              EAX = 0 
  3045                              <1> 	;   Command Interpreter phase 2 enter ->
  3046                              <1> 	;              AL = 2 -> Continue from the last position
  3047                              <1> 	;              AH = 
  3048                              <1> 	;   Phase 3 -> Load source file or use read/write cluster method
  3049                              <1> 	;   Phase 4 -> Create destination file if it is not found
  3050                              <1> 	;   Phase 5 -> Open destination file
  3051                              <1> 	;   Phase 6 -> Read from source and write to destination
  3052                              <1> 	;   Phase 7 -> Unload source file, if it is loaded at memory
  3053                              <1> 	;       cf = 1 causes to return before the phase 7
  3054                              <1> 	;              but loaded file will be unloaded
  3055                              <1> 	;	       (allocated memory block will be deallocated) 
  3056                              <1> 	;
  3057                              <1> 	; INPUT -> 
  3058                              <1> 	;	 ESI = Source File Pathname (Asciiz)
  3059                              <1> 	;        EDI = Destination File Pathname (Asciiz)
  3060                              <1> 	;        AL = 0 --> Interrupt (System call)
  3061                              <1> 	;        AL > 0 --> Command Interpreter (Question)
  3062                              <1> 	;        AL = 1 --> Question Phase
  3063                              <1> 	;        AL = 2 --> Progress Phase        
  3064                              <1> 	;
  3065                              <1> 	; OUTPUT -> 
  3066                              <1> 	;	cf = 0 -> OK
  3067                              <1> 	;	EAX = Destination file first cluster
  3068                              <1> 	;
  3069                              <1> 	;        CL > 0 if there is file reading error before EOF
  3070                              <1> 	;	        (incomplete copy) 
  3071                              <1> 	;        CH > 0 if file is (full) loaded at memory
  3072                              <1> 	;
  3073                              <1> 	;	cf = 1 -> Error code in AL (EAX) 
  3074                              <1> 	;
  3075                              <1> 	; (EBX, ECX, ESI, EDI register contents will be changed)           
  3076                              <1> 
  3077                              <1> 
  3078 0000ACCA 3C02                <1> 	cmp	al, 2
  3079 0000ACCC 0F845A020000        <1> 	je	csftdf2_check_cdrv
  3080                              <1> 
  3081                              <1> ; Phase 1
  3082                              <1> 
  3083 0000ACD2 A2[B84E0100]        <1> 	mov	byte [copy_cmd_phase], al
  3084                              <1> 
  3085 0000ACD7 57                  <1> 	push	edi ; *
  3086                              <1> 
  3087                              <1> csftdf_parse_sf_path:
  3088 0000ACD8 BF[904D0100]        <1> 	mov	edi, SourceFile_Drv
  3089 0000ACDD E884F4FFFF          <1> 	call	parse_path_name
  3090 0000ACE2 721C                <1> 	jc	short csftdf_parse_sf_path_failed
  3091                              <1> 
  3092                              <1> csftdf_parse_df_path:	
  3093 0000ACE4 5E                  <1> 	pop	esi ; * (pushed edi) 
  3094                              <1> 
  3095                              <1> csftdf_sf_check_filename_exists:
  3096 0000ACE5 803D[D24D0100]21    <1> 	cmp	byte [SourceFile_Name], 21h
  3097 0000ACEC 7215                <1> 	jb	short csftdf_sf_file_not_found_error
  3098                              <1> 
  3099 0000ACEE BF[104E0100]        <1> 	mov	edi, DestinationFile_Drv
  3100 0000ACF3 E86EF4FFFF          <1> 	call	parse_path_name
  3101 0000ACF8 7310                <1> 	jnc	short csftdf_check_sf_cdrv
  3102                              <1> 	
  3103 0000ACFA 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  3104 0000ACFC 760C                <1> 	jna	short csftdf_check_sf_cdrv
  3105                              <1> 
  3106                              <1> csftdf_parse_df_path_failed:
  3107 0000ACFE F9                  <1> 	stc 
  3108                              <1> csftdf_sf_error_retn: 
  3109 0000ACFF C3                  <1> 	retn
  3110                              <1> 
  3111                              <1> csftdf_parse_sf_path_failed:	
  3112 0000AD00 5F                  <1> 	pop	edi ; *
  3113 0000AD01 EBFC                <1> 	jmp	short csftdf_sf_error_retn
  3114                              <1> 
  3115                              <1> csftdf_sf_file_not_found_error:
  3116 0000AD03 B802000000          <1> 	mov	eax, 2 ; File not found 
  3117 0000AD08 EBF5                <1> 	jmp	short csftdf_sf_error_retn
  3118                              <1> 
  3119                              <1> csftdf_check_sf_cdrv:
  3120 0000AD0A 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  3121                              <1> 
  3122 0000AD10 883D[BB4E0100]      <1> 	mov	[csftdf_cdrv], bh ; 23/03/2016
  3123                              <1> 
  3124 0000AD16 8A15[904D0100]      <1> 	mov	dl, [SourceFile_Drv]
  3125 0000AD1C 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  3126 0000AD1E 7407                <1> 	je	short csftdf_sf_check_directory
  3127                              <1> 
  3128 0000AD20 E898BEFFFF          <1> 	call	change_current_drive
  3129 0000AD25 72D8                <1> 	jc	short csftdf_sf_error_retn
  3130                              <1> 
  3131                              <1> csftdf_sf_check_directory:
  3132 0000AD27 BE[914D0100]        <1> 	mov	esi, SourceFile_Directory
  3133 0000AD2C 803E20              <1> 	cmp	byte [esi], 20h
  3134 0000AD2F 760F                <1> 	jna	short csftdf_find_sf
  3135                              <1> 
  3136                              <1> csftdf_sf_change_directory:
  3137 0000AD31 FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  3138 0000AD37 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3139 0000AD39 E814EEFFFF          <1> 	call	change_current_directory
  3140 0000AD3E 72BF                <1> 	jc	short csftdf_sf_error_retn
  3141                              <1> 
  3142                              <1> ;csftdf_sf_change_prompt_dir_string:
  3143                              <1> ;	call	change_prompt_dir_string
  3144                              <1> 
  3145                              <1> csftdf_find_sf:
  3146 0000AD40 BE[D24D0100]        <1> 	mov	esi, SourceFile_Name
  3147 0000AD45 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3148 0000AD49 E801D2FFFF          <1> 	call	find_first_file
  3149 0000AD4E 72AF                <1> 	jc	short csftdf_sf_error_retn
  3150                              <1> 
  3151                              <1> csftdf_sf_ambgfn_check:
  3152 0000AD50 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3153 0000AD53 7407                <1> 	jz	short csftdf_sf_found
  3154                              <1> 
  3155                              <1> csftdf_ambiguous_file_name_error:
  3156 0000AD55 B802000000          <1> 	mov	eax, 2 ; File not found error
  3157 0000AD5A F9                  <1> 	stc
  3158 0000AD5B C3                  <1> 	retn
  3159                              <1> 
  3160                              <1> csftdf_sf_found:
  3161 0000AD5C A3[BC4E0100]        <1> 	mov	[csftdf_filesize], eax
  3162                              <1> 
  3163 0000AD61 09C0                <1> 	or	eax, eax
  3164 0000AD63 7507                <1> 	jnz	short csftdf_set_source_file_direntry
  3165                              <1> 
  3166                              <1> csftdf_sf_file_size_zero:
  3167 0000AD65 B814000000          <1> 	mov	eax, 20 ; TRDOS zero length (file size) error
  3168 0000AD6A F9                  <1> 	stc
  3169 0000AD6B C3                  <1> 	retn
  3170                              <1> 
  3171                              <1> csftdf_set_source_file_direntry:
  3172 0000AD6C BE[9C4C0100]        <1> 	mov	esi, FindFile_DirEntry
  3173 0000AD71 BF[E24D0100]        <1> 	mov	edi, SourceFile_DirEntry
  3174 0000AD76 B908000000          <1> 	mov	ecx, 8
  3175 0000AD7B F3A5                <1> 	rep	movsd
  3176                              <1> 
  3177                              <1> csftdf_sf_restore_cdrv:
  3178                              <1> 	; 22/03/2016
  3179 0000AD7D 8A15[BB4E0100]      <1> 	mov	dl, [csftdf_cdrv]
  3180 0000AD83 3A15[A6420100]      <1> 	cmp	dl, [Current_Drv]
  3181 0000AD89 7407                <1> 	je	short csftdf_sf_restore_cdir
  3182 0000AD8B E82DBEFFFF          <1> 	call	change_current_drive 
  3183 0000AD90 724F                <1> 	jc	short csftdf_df_error_retn ; 30/03/2016
  3184                              <1> 
  3185                              <1> csftdf_sf_restore_cdir:
  3186 0000AD92 803D[E3FE0000]00    <1> 	cmp	byte [Restore_CDIR], 0
  3187 0000AD99 7612                <1> 	jna	short csftdf_df_check_filename_exists
  3188 0000AD9B 29C0                <1> 	sub	eax, eax
  3189 0000AD9D BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3190 0000ADA2 88D4                <1> 	mov	ah, dl ; byte [csftdf_cdrv]
  3191 0000ADA4 01C6                <1> 	add	esi, eax
  3192 0000ADA6 E8C9BEFFFF          <1> 	call	restore_current_directory
  3193 0000ADAB 7234                <1> 	jc	short csftdf_df_error_retn
  3194                              <1>   
  3195                              <1> csftdf_df_check_filename_exists:
  3196 0000ADAD 803D[524E0100]20    <1> 	cmp	byte [DestinationFile_Name], 20h
  3197 0000ADB4 7716                <1> 	ja	short csftdf_check_df_cdrv
  3198                              <1> 
  3199                              <1> csftdf_copy_sf_name:
  3200 0000ADB6 BF[524E0100]        <1> 	mov	edi, DestinationFile_Name
  3201 0000ADBB BE[D24D0100]        <1> 	mov	esi, SourceFile_Name
  3202 0000ADC0 B10C                <1> 	mov	cl, 12
  3203                              <1> 
  3204                              <1> csftdf_df_copy_sf_name_loop:
  3205 0000ADC2 AC                  <1> 	lodsb
  3206 0000ADC3 AA                  <1> 	stosb
  3207 0000ADC4 08C0                <1> 	or	al, al
  3208 0000ADC6 7404                <1> 	jz	short csftdf_check_df_cdrv             
  3209 0000ADC8 FEC9                <1> 	dec	cl
  3210 0000ADCA 75F6                <1> 	jnz	csftdf_df_copy_sf_name_loop
  3211                              <1> 
  3212                              <1> csftdf_check_df_cdrv:
  3213 0000ADCC 8A15[104E0100]      <1> 	mov	dl, [DestinationFile_Drv]
  3214 0000ADD2 3A15[A6420100]      <1> 	cmp	dl, [Current_Drv]
  3215 0000ADD8 7408                <1> 	je	short csftdf_df_check_directory
  3216                              <1> 
  3217 0000ADDA E8DEBDFFFF          <1> 	call	change_current_drive
  3218 0000ADDF 7301                <1> 	jnc	short csftdf_df_check_directory
  3219                              <1> 
  3220                              <1> csftdf_df_error_retn:
  3221 0000ADE1 C3                  <1> 	retn
  3222                              <1> 
  3223                              <1> csftdf_df_check_directory:
  3224 0000ADE2 BE[114E0100]        <1> 	mov	esi, DestinationFile_Directory
  3225 0000ADE7 803E20              <1>         cmp     byte [esi], 20h
  3226 0000ADEA 760F                <1> 	jna	short csftdf_find_df
  3227                              <1> 
  3228                              <1> csftdf_df_change_directory:
  3229 0000ADEC FE05[E3FE0000]      <1> 	inc	byte [Restore_CDIR]
  3230 0000ADF2 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  3231 0000ADF4 E859EDFFFF          <1> 	call	change_current_directory
  3232 0000ADF9 72E6                <1> 	jc	short csftdf_df_error_retn
  3233                              <1> 
  3234                              <1> ;csftdf_df_change_prompt_dir_string:
  3235                              <1> ;	call	change_prompt_dir_string
  3236                              <1> 
  3237                              <1> csftdf_find_df:
  3238                              <1> 	; 23/03/2016
  3239 0000ADFB 29DB                <1> 	sub	ebx, ebx
  3240 0000ADFD 8A3D[104E0100]      <1> 	mov	bh,  [DestinationFile_Drv]
  3241 0000AE03 81C300010900        <1> 	add	ebx, Logical_DOSDisks
  3242 0000AE09 891D[E84E0100]      <1> 	mov	[csftdf_df_drv_dt], ebx
  3243                              <1> 
  3244 0000AE0F BE[524E0100]        <1> 	mov	esi, DestinationFile_Name
  3245 0000AE14 6631C0              <1> 	xor	ax, ax 
  3246                              <1> 		; DestinationFile_AttributesMask -> any/zero
  3247 0000AE17 E833D1FFFF          <1> 	call	find_first_file
  3248 0000AE1C 7218                <1> 	jc	short csftdf_df_check_error_code
  3249                              <1> 
  3250                              <1> csftdf_df_ambgfn_check:
  3251 0000AE1E 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3252 0000AE21 752A                <1> 	jnz	short csftdf_df_error_inv_fname
  3253                              <1> 	
  3254                              <1> csftdf_df_found:
  3255 0000AE23 C605[BA4E0100]01    <1> 	mov	byte [DestinationFileFound], 1
  3256                              <1> 	; 17/10/2016 (cl -> bl)
  3257 0000AE2A 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  3258 0000AE2D 745F                <1> 	jz	short csftdf_df_save_first_cluster
  3259                              <1> 
  3260                              <1> csftdf_df_permission_denied_retn:	 
  3261 0000AE2F B805000000          <1> 	mov	eax, 05h ; Access/Permisson denied.
  3262                              <1> csftdf_df_error_stc_retn:
  3263 0000AE34 F9                  <1> 	stc
  3264 0000AE35 C3                  <1> 	retn
  3265                              <1> 
  3266                              <1> csftdf_df_check_error_code:
  3267                              <1> 	;cmp	eax, 2
  3268 0000AE36 3C02                <1> 	cmp	al, 2
  3269 0000AE38 75FA                <1> 	jne	short csftdf_df_error_stc_retn
  3270                              <1> 
  3271 0000AE3A C605[BA4E0100]00    <1> 	mov	byte [DestinationFileFound], 0
  3272                              <1> 
  3273                              <1> 	; 15/10/2016
  3274 0000AE41 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name ; *
  3275 0000AE46 E8C4D4FFFF          <1> 	call	check_filename
  3276 0000AE4B 7307                <1> 	jnc	short csftdf_df_valid_fname
  3277                              <1> csftdf_df_error_inv_fname: ; 'invalid file name !'
  3278 0000AE4D B81A000000          <1> 	mov 	eax, ERR_INV_FILE_NAME  ; 26
  3279 0000AE52 F9                  <1> 	stc	
  3280 0000AE53 C3                  <1> 	retn
  3281                              <1> 
  3282                              <1> csftdf_df_valid_fname:	
  3283                              <1> 	; 21/03/2016
  3284                              <1> 	; (Capitalized file name)
  3285                              <1> 	;mov	esi, FindFile_Name ; * ; 15/10/2016
  3286 0000AE54 BF[524E0100]        <1> 	mov	edi, DestinationFile_Name
  3287 0000AE59 A5                  <1> 	movsd
  3288 0000AE5A A5                  <1> 	movsd	
  3289 0000AE5B A5                  <1> 	movsd
  3290                              <1> 	;movsb
  3291                              <1> 
  3292                              <1> csftdf_check_disk_free_size_0:
  3293 0000AE5C A1[FE4D0100]        <1> 	mov	eax, [SourceFile_DirEntry+DirEntry_FileSize]
  3294                              <1> 
  3295                              <1> csftdf_check_disk_free_size_1:
  3296                              <1> 	;sub	ebx, ebx
  3297                              <1> 	;mov 	esi, Logical_DOSDisks
  3298                              <1> 	;mov	bh,  [DestinationFile_Drv]
  3299                              <1> 	;add	esi, ebx
  3300                              <1> 	
  3301 0000AE61 8B35[E84E0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3302                              <1> 
  3303 0000AE67 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3304 0000AE6B 01C8                <1> 	add	eax, ecx
  3305 0000AE6D 48                  <1> 	dec	eax  ; file size (additional bytes) + 511 (round up)
  3306                              <1> csftdf_check_disk_free_size_3: ; 16/03/2016
  3307 0000AE6E 29D2                <1> 	sub	edx, edx
  3308 0000AE70 F7F1                <1> 	div	ecx ; bytes per sector
  3309                              <1> 
  3310                              <1> csftdf_check_disk_free_size:
  3311 0000AE72 3B4674              <1> 	cmp	eax, [esi+LD_FreeSectors]
  3312 0000AE75 0F8294000000        <1>         jb      csftdf_check_disk_free_size_ok
  3313 0000AE7B 770A                <1> 	ja	short csftdf_df_insufficient_disk_space
  3314                              <1> 
  3315 0000AE7D 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0 ; FS needs FDT sector also.
  3316 0000AE81 0F8788000000        <1>         ja      csftdf_check_disk_free_size_ok 
  3317                              <1> 
  3318                              <1> csftdf_df_insufficient_disk_space:
  3319 0000AE87 B827000000          <1> 	mov	eax, 27h ; insufficient disk space
  3320 0000AE8C EBA6                <1> 	jmp	short csftdf_df_error_stc_retn
  3321                              <1> 
  3322                              <1> csftdf_df_save_first_cluster:
  3323                              <1> 	; ESI = FindFile_DirEntry (for the old destination file)
  3324                              <1> 	; EAX = Old destination file size
  3325                              <1> 	; 24/03/2016
  3326                              <1> 	; EDI = Directory entry address (within Dir Buffer boundaries)
  3327 0000AE8E 81EF00000800        <1> 	sub	edi, Directory_Buffer  ; (<65536)
  3328 0000AE94 66C1EF05            <1> 	shr	di, 5 ; Convert entry offset to entry index/number
  3329 0000AE98 66893D[8A4E0100]    <1> 	mov	[DestinationFile_DirEntryNumber], di ; (<2048)
  3330                              <1> 
  3331                              <1> csftdf_df_check_sf_df_fcluster:
  3332 0000AE9F 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  3333 0000AEA3 C1E210              <1> 	shl	edx, 16
  3334 0000AEA6 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  3335 0000AEAA 8915[CC4E0100]      <1> 	mov	[csftdf_df_cluster], edx
  3336                              <1> csftdf_df_check_sf_df_fcluster_1:
  3337 0000AEB0 668B15[F64D0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3338 0000AEB7 C1E210              <1> 	shl	edx, 16
  3339 0000AEBA 668B15[FC4D0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3340 0000AEC1 3B15[CC4E0100]      <1> 	cmp	edx, [csftdf_df_cluster]
  3341 0000AEC7 7512                <1> 	jne	short csftdf_df_check_sf_df_fcluster_ok
  3342                              <1> csftdf_df_check_sf_df_drv:
  3343 0000AEC9 8A15[904D0100]      <1> 	mov	dl, [SourceFile_Drv]
  3344 0000AECF 3A15[104E0100]      <1> 	cmp	dl, [DestinationFile_Drv]
  3345 0000AED5 7504                <1> 	jne	short csftdf_df_check_sf_df_fcluster_ok
  3346                              <1> 
  3347                              <1> 	; source and destination files are same !
  3348                              <1> 	; (they have same first cluster value on same logical disk)
  3349                              <1> 
  3350 0000AED7 31C0                <1> 	xor	eax, eax ; mov eax, 0 -> Bad command or file name !
  3351 0000AED9 F9                  <1> 	stc
  3352 0000AEDA C3                  <1> 	retn 
  3353                              <1>    
  3354                              <1> csftdf_df_check_sf_df_fcluster_ok:
  3355                              <1> csftdf_df_move_findfile_struct:
  3356                              <1> 	; mov	esi, FindFile_DirEntry
  3357 0000AEDB BF[624E0100]        <1> 	mov	edi, DestinationFile_DirEntry
  3358 0000AEE0 B908000000          <1> 	mov	ecx, 8
  3359 0000AEE5 F3A5                <1> 	rep	movsd
  3360                              <1> 	
  3361                              <1> csftdf_check_disk_free_size_2:
  3362 0000AEE7 89C2                <1> 	mov	edx, eax ; Old destination file size
  3363                              <1> 
  3364                              <1> 	;mov	eax, [SourceFile_DirEntry+DirEntry_FileSize]
  3365 0000AEE9 A1[BC4E0100]        <1> 	mov	eax, [csftdf_filesize] ; 23/03/2016
  3366                              <1> 
  3367                              <1> 	;;sub	ecx, ecx ; 0
  3368                              <1> 	;mov 	esi, Logical_DOSDisks
  3369                              <1> 	;mov	ch,  [DestinationFile_Drv]
  3370                              <1> 	;add	esi, ecx
  3371                              <1> 	;
  3372                              <1> 	;mov	[csftdf_df_drv_dt], esi
  3373                              <1> 
  3374 0000AEEE 8B35[E84E0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3375                              <1> 
  3376 0000AEF4 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3377 0000AEF8 01CA                <1> 	add	edx, ecx ; + 512
  3378 0000AEFA 01C8                <1> 	add	eax, ecx ; + 512
  3379 0000AEFC 4A                  <1> 	dec	edx ; old file size + 511 (round up)
  3380 0000AEFD 48                  <1> 	dec	eax ; new file size + 511 (round up)
  3381 0000AEFE F7D9                <1> 	neg	ecx ; -512 ; 0FFFFFE00h
  3382 0000AF00 21CA                <1> 	and	edx, ecx ; = old sector count * 512 
  3383 0000AF02 21C8                <1> 	and	eax, ecx ; = new sector count * 512 
  3384                              <1> 
  3385 0000AF04 29D0                <1> 	sub	eax, edx ; new file size - old file size (on disk)
  3386 0000AF06 7607                <1> 	jna	short csftdf_check_disk_free_size_ok
  3387                              <1> 
  3388 0000AF08 F7D9                <1> 	neg	ecx ; 512 (bytes per sector) ; 200h
  3389                              <1> 	; check free space for additional sectors
  3390                              <1> 	; eax = number of additional sectors * bytes per sector
  3391                              <1> 	; esi = Logical DOS drive number (of destination disk)
  3392 0000AF0A E95FFFFFFF          <1>         jmp     csftdf_check_disk_free_size_3
  3393                              <1>  
  3394                              <1> csftdf_check_disk_free_size_ok:
  3395                              <1> 	; 18/03/2016
  3396                              <1> csftdf_df_check_copy_cmd_phase:
  3397 0000AF0F A0[B84E0100]        <1> 	mov	al, [copy_cmd_phase]
  3398 0000AF14 3C01                <1> 	cmp	al, 1
  3399 0000AF16 7514                <1> 	jne	short csftdf2_check_cdrv
  3400                              <1> 	
  3401 0000AF18 31C0                <1> 	xor	eax, eax
  3402 0000AF1A A2[B84E0100]        <1> 	mov	[copy_cmd_phase], al ; 0
  3403                              <1> 
  3404 0000AF1F 8A15[BA4E0100]      <1> 	mov	dl, [DestinationFileFound]            
  3405 0000AF25 8A35[ED4D0100]      <1> 	mov	dh, [SourceFile_DirEntry+11] ; Attributes
  3406                              <1>  
  3407                              <1> csftdf_return:	
  3408 0000AF2B C3                  <1> 	retn
  3409                              <1> 
  3410                              <1> ; Phase 2
  3411                              <1> 
  3412                              <1> csftdf2_check_cdrv:
  3413                              <1> 	; 18/03/2016
  3414                              <1> 	; Here, destination drive and directory are ready !
  3415                              <1> 	; (checking/restoring is not needed)
  3416                              <1> 	; (Since at the end of the phase 1)
  3417                              <1> 
  3418                              <1> ;	mov	dl, [DestinationFile_Drv]
  3419                              <1> ;	cmp	dl, [Current_Drv]
  3420                              <1> ;	je	short csftdf2_df_check_directory
  3421                              <1> ;
  3422                              <1> ;	call	change_current_drive
  3423                              <1> ;	jc	short csftdf2_read_error
  3424                              <1> ;
  3425                              <1> ;csftdf2_df_check_directory:
  3426                              <1> ;	mov	esi, DestinationFile_Directory  
  3427                              <1> ;	cmp	byte [esi], 20h
  3428                              <1> ;	jna	short csftdf2_df_check_found_or_not
  3429                              <1> ;
  3430                              <1> ;csftdf2_df_change_directory:
  3431                              <1> ;	inc	byte [Restore_CDIR]
  3432                              <1> ;	xor	ah, ah ; CD_COMMAND sign -> 0 
  3433                              <1> ;	call	change_current_directory
  3434                              <1> ;	jc	short csftdf2_stc_return
  3435                              <1> ;
  3436                              <1> ;;csftdf2_df_change_prompt_dir_string:
  3437                              <1> ;;	call	change_prompt_dir_string
  3438                              <1> 
  3439                              <1> csftdf2_df_check_found_or_not:
  3440                              <1> 	; 21/03/2016
  3441 0000AF2C 803D[BA4E0100]00    <1> 	cmp	byte [DestinationFileFound], 0 
  3442 0000AF33 7739                <1> 	ja	short csftdf2_set_sf_percentage
  3443                              <1> 
  3444                              <1> csftdf2_create_file:
  3445 0000AF35 BE[524E0100]        <1> 	mov	esi, DestinationFile_Name
  3446 0000AF3A A1[BC4E0100]        <1> 	mov	eax, [csftdf_filesize]
  3447 0000AF3F 30C9                <1> 	xor	cl, cl ; 0
  3448                              <1> 
  3449 0000AF41 31DB                <1> 	xor	ebx, ebx ; 0
  3450 0000AF43 4B                  <1> 	dec	ebx ; 0FFFFFFFFh 
  3451                              <1> 
  3452                              <1> 	; INPUT ->
  3453                              <1> 	; 	EAX -> File Size
  3454                              <1> 	; 	ESI = ASCIIZ File name
  3455                              <1> 	;	 CL = File attributes
  3456                              <1> 	;	EBX = FFFFFFFFh -> empty file sign for FAT fs
  3457                              <1> 	;	EBX <> FFFFFFFFh -> use file size for FAT fs 
  3458                              <1> 	;
  3459                              <1> 	; OUTPUT ->
  3460                              <1> 	;	EAX = New file's first cluster
  3461                              <1> 	;	ESI = Logical Dos Drv Descr. Table Addr.
  3462                              <1> 	;	EBX = CreateFile_Size address
  3463                              <1> 	;	ECX = Sectors per cluster (<256)
  3464                              <1> 	;	EDX = Directory Entry Index/Number (<65536)
  3465                              <1> 	;		
  3466                              <1> 	;	cf = 1 -> error code in AL (EAX)
  3467                              <1> 
  3468 0000AF44 E8EC050000          <1> 	call	create_file
  3469                              <1> 	;pop	esi
  3470 0000AF49 0F82A3050000        <1>         jc      csftdf2_rw_error
  3471                              <1> 
  3472                              <1> csftdf2_create_file_OK:
  3473 0000AF4F A3[CC4E0100]        <1> 	mov	[csftdf_df_cluster], eax
  3474                              <1> 	
  3475                              <1> 	; 24/03/2016
  3476 0000AF54 668915[8A4E0100]    <1> 	mov	[DestinationFile_DirEntryNumber], dx 
  3477                              <1> 
  3478                              <1> 	; 21/03/2016
  3479 0000AF5B BE00000800          <1> 	mov	esi, Directory_Buffer
  3480 0000AF60 C1E205              <1> 	shl	edx, 5 ; 32 * index number
  3481 0000AF63 01D6                <1> 	add	esi, edx
  3482 0000AF65 BF[624E0100]        <1> 	mov	edi, DestinationFile_DirEntry	
  3483 0000AF6A B108                <1> 	mov	cl, 8 ; 32 bytes
  3484 0000AF6C F3A5                <1> 	rep	movsd
  3485                              <1> 
  3486                              <1> csftdf2_set_sf_percentage:
  3487                              <1> 	; 17/03/2016
  3488 0000AF6E 31C0                <1> 	xor	eax, eax	
  3489 0000AF70 A2[E04E0100]        <1> 	mov 	[csftdf_percentage], al ; 0, reset
  3490                              <1> 
  3491 0000AF75 A3[D84E0100]        <1> 	mov	[csftdf_sf_rbytes], eax ; 0, reset
  3492 0000AF7A A3[DC4E0100]        <1> 	mov	[csftdf_df_wbytes], eax ; 0, reset
  3493                              <1> 
  3494 0000AF7F 8A25[904D0100]      <1> 	mov	ah, [SourceFile_Drv]	
  3495 0000AF85 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3496 0000AF8A 01C6                <1> 	add	esi, eax
  3497                              <1> 	
  3498 0000AF8C 8935[E44E0100]      <1> 	mov	[csftdf_sf_drv_dt], esi ; 23/03/2016
  3499                              <1> 
  3500 0000AF92 668B15[F64D0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3501 0000AF99 C1E210              <1> 	shl	edx, 16
  3502 0000AF9C 668B15[FC4D0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3503 0000AFA3 8915[C84E0100]      <1> 	mov	[csftdf_sf_cluster], edx
  3504                              <1> 
  3505                              <1> 	; 16/03/2016
  3506                              <1> 	; Note: Singlix FS boot sector parameters (for cluster
  3507                              <1> 	;	related calculations) has same offset
  3508                              <1> 	;	values from LD_BPB as in FAT file system.
  3509                              <1> 	;	[esi+LD_BPB+SecPerClust] is 1 for Singlix FS.
  3510                              <1> 	;	
  3511 0000AFA9 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  3512 0000AFAD 880D[0E4E0100]      <1> 	mov	[SourceFile_SecPerClust], cl
  3513                              <1> 
  3514                              <1> 	; 17/03/2016
  3515 0000AFB3 386E03              <1> 	cmp	[esi+LD_FATType], ch ; 0
  3516 0000AFB6 7707                <1> 	ja	short csftdf2_set_sf_percent_rsize1
  3517                              <1> 
  3518 0000AFB8 B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3519 0000AFBD EB06                <1> 	jmp	short csftdf2_set_sf_percent_rsize2	
  3520                              <1>  
  3521                              <1> csftdf2_set_sf_percent_rsize1:
  3522 0000AFBF 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  3523 0000AFC3 F7E1                <1> 	mul	ecx
  3524                              <1> 	;sub	edx, edx
  3525                              <1> csftdf2_set_sf_percent_rsize2:
  3526 0000AFC5 A3[D04E0100]        <1> 	mov	[csftdf_r_size], eax
  3527                              <1> 
  3528                              <1> csftdf2_set_df_percentage:
  3529                              <1> 	;sub	eax, eax
  3530                              <1> 	;mov	ah, [DestinationFile_Drv]	
  3531                              <1> 	;mov	edi, Logical_DOSDisks
  3532                              <1> 	;add	edi, eax
  3533                              <1> 	;mov	[csftdf_df_drv_dt], edi ; 17/03/2016
  3534                              <1> 
  3535 0000AFCA 8B3D[E84E0100]      <1> 	mov	edi, [csftdf_df_drv_dt] ; 23/03/2016
  3536                              <1> 
  3537                              <1> 	; 16/03/2016
  3538                              <1> 	; Note: Singlix FS boot sector parameters (for cluster
  3539                              <1> 	;	related calculations) has same offset
  3540                              <1> 	;	values from LD_BPB as in FAT file system.
  3541                              <1> 	;	[edi+LD_BPB+SecPerClust] is 1 for Singlix FS.
  3542                              <1> 	;	
  3543                              <1> 	;movzx	ecx, byte [edi+LD_BPB+SecPerClust]
  3544 0000AFD0 8A4F13              <1> 	mov	cl, [edi+LD_BPB+SecPerClust]
  3545 0000AFD3 880D[8E4E0100]      <1> 	mov	[DestinationFile_SecPerClust], cl
  3546                              <1> 
  3547                              <1> 	; 17/03/2016
  3548 0000AFD9 386F03              <1> 	cmp	[edi+LD_FATType], ch ; 0
  3549 0000AFDC 7707                <1> 	ja	short csftdf2_set_df_percent_wsize1
  3550                              <1> 	
  3551 0000AFDE B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3552 0000AFE3 EB06                <1> 	jmp	short csftdf2_set_df_percent_wsize2	
  3553                              <1> 
  3554                              <1> csftdf2_set_df_percent_wsize1:
  3555 0000AFE5 0FB74711            <1> 	movzx	eax, word [edi+LD_BPB+BytesPerSec]
  3556 0000AFE9 F7E1                <1> 	mul	ecx
  3557                              <1> 	;sub	edx, edx
  3558                              <1> csftdf2_set_df_percent_wsize2:
  3559 0000AFEB A3[D44E0100]        <1> 	mov	[csftdf_w_size], eax
  3560                              <1> 
  3561 0000AFF0 A1[BC4E0100]        <1> 	mov	eax, [csftdf_filesize]
  3562                              <1> 
  3563 0000AFF5 3D00000100          <1> 	cmp	eax, 65536 ; 64KB	; small file
  3564 0000AFFA 721F                <1> 	jb	short csftdf2_load_file ; do not display percentage
  3565                              <1> 	
  3566                              <1> csftdf2_reset_wf_percent_ptr_chk_64k:
  3567 0000AFFC B201                <1> 	mov	dl, 1 ; 25/03/2016
  3568                              <1> 
  3569 0000AFFE 3D00000400          <1> 	cmp	eax, 65536*4 ; 256KB
  3570 0000B003 7310                <1> 	jnb	short csftdf2_enable_percentage_display ; big file
  3571                              <1> 
  3572                              <1> 	; 64-128KB file size for floppy disks
  3573 0000B005 3815[904D0100]      <1> 	cmp	byte [SourceFile_Drv], dl ; 1 ; read from floppy disk ?
  3574 0000B00B 7608                <1> 	jna	short csftdf2_enable_percentage_display
  3575                              <1> 
  3576 0000B00D 3815[104E0100]      <1> 	cmp	byte [DestinationFile_Drv], dl ; 1 ; write to floppy disk ?
  3577 0000B013 7706                <1> 	ja	short csftdf2_load_file
  3578                              <1> 
  3579                              <1> csftdf2_enable_percentage_display:	
  3580 0000B015 8815[E04E0100]      <1> 	mov	[csftdf_percentage], dl ; 1	
  3581                              <1> 	
  3582                              <1> csftdf2_load_file:
  3583                              <1> 	; 13/05/2016
  3584                              <1> 	; 19/03/2016
  3585                              <1> 	; 18/03/2016
  3586                              <1> 	; 17/03/2016
  3587 0000B01B B40F                <1> 	mov	ah, 0Fh
  3588 0000B01D E87864FFFF          <1> 	call	_int10h
  3589                              <1> 	; 13/05/2016
  3590 0000B022 883D[E14E0100]      <1> 	mov	[csftdf_videopage], bh ; active video page
  3591 0000B028 B403                <1> 	mov	ah, 03h
  3592 0000B02A E86B64FFFF          <1> 	call	_int10h
  3593 0000B02F 668915[E24E0100]    <1> 	mov	[csftdf_cursorpos], dx
  3594                              <1> 
  3595 0000B036 29C0                <1> 	sub	eax, eax
  3596 0000B038 A2[B94E0100]        <1> 	mov	[csftdf_rw_err], al ; 0 
  3597                              <1> 
  3598                              <1> ; ///
  3599                              <1> csftdf_sf_amb: ; 15/03/2016
  3600 0000B03D 8B0D[BC4E0100]      <1> 	mov	ecx, [csftdf_filesize]	; 23/03/2016
  3601                              <1> 
  3602                              <1> 	; TRDOS 386 (TRDOS v2.0)
  3603                              <1> 	; Allocate contiguous memory block for loading the file
  3604                              <1> 	
  3605                              <1> 	;mov	ecx, [SourceFile_DirEntry+DirEntry_FileSize]
  3606                              <1> 	
  3607                              <1> 	;sub	eax, eax ; First free memory aperture
  3608                              <1> 	
  3609                              <1> 	; eax = 0 (Allocate memory from the beginning)
  3610                              <1> 	; ecx = File (Allocation) size in bytes
  3611                              <1> 	
  3612 0000B043 E8DBA3FFFF          <1> 	call	allocate_memory_block
  3613 0000B048 7304                <1> 	jnc	short loc_check_sf_save_loading_parms
  3614                              <1> 
  3615 0000B04A 29C0                <1> 	sub	eax, eax
  3616 0000B04C 29C9                <1> 	sub	ecx, ecx
  3617                              <1> 	
  3618                              <1> loc_check_sf_save_loading_parms:
  3619 0000B04E A3[C04E0100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  3620 0000B053 890D[C44E0100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  3621                              <1> ; ///   
  3622                              <1> 	; 19/03/2016
  3623 0000B059 8B35[E44E0100]      <1> 	mov	esi, [csftdf_sf_drv_dt] ; logical dos drv desc. tbl.
  3624                              <1> 
  3625                              <1> 	; 17/03/2016
  3626 0000B05F 09C0                <1> 	or	eax, eax ; contiguous free memory block address 
  3627 0000B061 0F845B010000        <1>         jz      csftdf2_read_sf_cluster
  3628                              <1> 
  3629                              <1> 	; 18/03/2016
  3630 0000B067 8B1D[C04E0100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3631                              <1> 
  3632 0000B06D 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3633 0000B071 0F8605020000        <1>         jna     csftdf2_load_fs_file
  3634                              <1> 
  3635                              <1> csftdf2_load_fat_file:
  3636 0000B077 53                  <1> 	push	ebx ; *
  3637                              <1> 
  3638                              <1> csftdf2_load_fat_file_next:
  3639 0000B078 BE[33050100]        <1> 	mov	esi, msg_reading
  3640 0000B07D E83BB2FFFF          <1> 	call	print_msg
  3641                              <1> 
  3642 0000B082 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3643 0000B089 7605                <1> 	jna	short csftdf2_load_fat_file_1
  3644                              <1> 	
  3645 0000B08B E87C000000          <1> 	call	csftdf2_print_percentage ; 19/03/2016
  3646                              <1> 
  3647                              <1> csftdf2_load_fat_file_1:
  3648 0000B090 8B35[E44E0100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3649 0000B096 5B                  <1> 	pop	ebx ; *
  3650                              <1> 
  3651                              <1> csftdf2_load_fat_file_2:
  3652 0000B097 E8B8000000          <1> 	call	csftdf2_read_fat_file_sectors ; 19/03/2016
  3653 0000B09C 0F8250040000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  3654                              <1> 
  3655 0000B0A2 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3656 0000B0A4 7520                <1> 	jnz	short csftdf2_load_fat_file_ok
  3657                              <1> 
  3658 0000B0A6 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3659 0000B0AD 76E8                <1> 	jna	short csftdf2_load_fat_file_2
  3660                              <1> 
  3661 0000B0AF 53                  <1> 	push	ebx ; *	
  3662                              <1> 
  3663                              <1> 	; Set cursor position
  3664                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3665 0000B0B0 8A3D[E14E0100]      <1> 	mov	bh, [csftdf_videopage]
  3666 0000B0B6 668B15[E24E0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3667 0000B0BD B402                <1> 	mov	ah, 2
  3668 0000B0BF E8D663FFFF          <1> 	call	_int10h
  3669 0000B0C4 EBB2                <1> 	jmp	short csftdf2_load_fat_file_next
  3670                              <1> 	
  3671                              <1> csftdf2_load_fat_file_ok:
  3672 0000B0C6 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3673 0000B0CD 0F8651020000        <1>         jna     csftdf2_save_file ; 25/03/2016
  3674                              <1> 	
  3675                              <1> 	; "Reading... 100%"
  3676 0000B0D3 BF[4B050100]        <1> 	mov	edi, percentagestr
  3677 0000B0D8 B031                <1> 	mov	al, '1'
  3678 0000B0DA AA                  <1> 	stosb
  3679 0000B0DB B030                <1> 	mov	al, '0'
  3680 0000B0DD AA                  <1> 	stosb
  3681 0000B0DE AA                  <1> 	stosb
  3682                              <1> 
  3683 0000B0DF 8A3D[E14E0100]      <1> 	mov	bh, [csftdf_videopage]
  3684 0000B0E5 668B15[E24E0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3685 0000B0EC B402                <1> 	mov	ah, 2
  3686 0000B0EE E8A763FFFF          <1> 	call	_int10h
  3687                              <1> 
  3688 0000B0F3 BE[33050100]        <1> 	mov	esi, msg_reading
  3689 0000B0F8 E8C0B1FFFF          <1> 	call	print_msg
  3690                              <1> 	
  3691 0000B0FD BE[4B050100]        <1> 	mov	esi, percentagestr
  3692 0000B102 E8B6B1FFFF          <1> 	call	print_msg
  3693                              <1> 
  3694 0000B107 E918020000          <1>         jmp     csftdf2_save_file ; 25/03/2016
  3695                              <1> 
  3696                              <1> csftdf2_print_percentage:
  3697                              <1> 	; 19/03/2016
  3698                              <1> 	; 18/03/2016
  3699 0000B10C B020                <1> 	mov	al, 20h
  3700 0000B10E BF[4B050100]        <1> 	mov	edi, percentagestr
  3701 0000B113 AA                  <1> 	stosb
  3702 0000B114 AA                  <1> 	stosb
  3703 0000B115 A1[D84E0100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3704 0000B11A BA64000000          <1> 	mov	edx, 100
  3705 0000B11F F7E2                <1> 	mul	edx
  3706 0000B121 8B0D[BC4E0100]      <1> 	mov	ecx, [csftdf_filesize]	
  3707 0000B127 F7F1                <1> 	div	ecx
  3708 0000B129 B10A                <1> 	mov	cl, 10
  3709 0000B12B F6F1                <1> 	div	cl
  3710 0000B12D 80C430              <1> 	add	ah, '0'
  3711 0000B130 8827                <1> 	mov	[edi], ah
  3712 0000B132 20C0                <1> 	and	al, al
  3713 0000B134 740A                <1> 	jz	short csftdf2_print_percent_1
  3714 0000B136 4F                  <1> 	dec	edi
  3715 0000B137 6698                <1> 	cbw
  3716 0000B139 F6F1                <1> 	div	cl
  3717 0000B13B 80C430              <1> 	add	ah, '0'
  3718 0000B13E 8827                <1> 	mov	[edi], ah
  3719                              <1> 	;and	al, al
  3720                              <1> 	;jz	short csftdf2_print_percent_1
  3721                              <1> 	;dec	edi
  3722                              <1> 	;mov	[edi], '1' ; 100%		
  3723                              <1> 
  3724                              <1> csftdf2_print_percent_1:
  3725 0000B140 BE[4B050100]        <1> 	mov	esi, percentagestr
  3726                              <1> 	;call	print_msg
  3727                              <1> 	;retn
  3728 0000B145 E973B1FFFF          <1> 	jmp	print_msg
  3729                              <1> 
  3730                              <1> csftdf2_read_file_sectors:
  3731                              <1> 	; 19/03/2016
  3732 0000B14A 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3733 0000B14E 0F8627070000        <1>         jna     csftdf2_read_fs_file_sectors
  3734                              <1> 
  3735                              <1> csftdf2_read_fat_file_sectors:
  3736                              <1> 	; 19/03/2016
  3737                              <1> 	; 18/03/2016
  3738                              <1> 	; return:
  3739                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  3740                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  3741                              <1> 	;   CF = 1 -> read error (error code in AL)	
  3742                              <1> 
  3743                              <1> csftdf2_read_fat_file_secs_0:
  3744 0000B154 8B15[BC4E0100]      <1> 	mov	edx, [csftdf_filesize]
  3745 0000B15A 2B15[D84E0100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  3746 0000B160 3B15[D04E0100]      <1> 	cmp	edx, [csftdf_r_size]	
  3747 0000B166 7306                <1> 	jnb	short csftdf2_read_fat_file_secs_1
  3748 0000B168 8915[D04E0100]      <1> 	mov	[csftdf_r_size], edx
  3749                              <1> 		
  3750                              <1> csftdf2_read_fat_file_secs_1:
  3751 0000B16E A1[D04E0100]        <1> 	mov	eax, [csftdf_r_size]
  3752 0000B173 29D2                <1> 	sub	edx, edx
  3753 0000B175 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3754 0000B179 01C8                <1> 	add	eax, ecx
  3755 0000B17B 48                  <1> 	dec	eax
  3756 0000B17C F7F1                <1> 	div	ecx
  3757 0000B17E 89C1                <1> 	mov	ecx, eax ; sector count
  3758 0000B180 A1[C84E0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3759                              <1> 
  3760                              <1> 	; EBX = memory block address (current)
  3761                              <1> 	
  3762 0000B185 E821090000          <1> 	call	read_fat_file_sectors
  3763 0000B18A 7235                <1> 	jc	short csftdf2_read_fat_file_secs_3
  3764                              <1> 
  3765                              <1> 	; EBX = next memory address
  3766                              <1> 
  3767 0000B18C A1[D84E0100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3768 0000B191 0305[D04E0100]      <1> 	add	eax, [csftdf_r_size]
  3769 0000B197 8B15[BC4E0100]      <1> 	mov	edx, [csftdf_filesize]
  3770 0000B19D 39D0                <1> 	cmp	eax, edx
  3771 0000B19F 7320                <1> 	jnb	short csftdf2_read_fat_file_secs_3 ; edx > 0
  3772 0000B1A1 A3[D84E0100]        <1> 	mov	[csftdf_sf_rbytes], eax
  3773                              <1> 
  3774 0000B1A6 53                  <1> 	push	ebx ; *
  3775                              <1> 	; get next cluster (csftdf_r_size! bytes)
  3776 0000B1A7 A1[C84E0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3777 0000B1AC E8CC060000          <1> 	call	get_next_cluster
  3778 0000B1B1 5B                  <1> 	pop	ebx ; *
  3779 0000B1B2 7306                <1> 	jnc	short csftdf2_read_fat_file_secs_2
  3780                              <1> 
  3781                              <1> 	; 15/10/2016
  3782                              <1> 	;Disk read error instad of drv not ready err
  3783 0000B1B4 B811000000          <1> 	mov	eax, 17 ; Read error !
  3784 0000B1B9 C3                  <1> 	retn
  3785                              <1> 
  3786                              <1> csftdf2_read_fat_file_secs_2:
  3787 0000B1BA 29D2                <1> 	sub	edx, edx ; 0
  3788 0000B1BC A3[C84E0100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  3789                              <1> 
  3790                              <1> csftdf2_read_fat_file_secs_3:
  3791 0000B1C1 C3                  <1> 	retn
  3792                              <1> 
  3793                              <1> csftdf2_read_sf_cluster:
  3794                              <1> 	; 19/03/2016
  3795 0000B1C2 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3796                              <1> 
  3797 0000B1C7 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3798 0000B1CE 760D                <1> 	jna	short csftdf2_read_sf_clust_2
  3799                              <1> 
  3800 0000B1D0 53                  <1> 	push	ebx ; *	
  3801                              <1> 
  3802                              <1> csftdf2_read_sf_clust_next:
  3803 0000B1D1 E836FFFFFF          <1> 	call	csftdf2_print_percentage
  3804                              <1> 
  3805                              <1> csftdf2_read_sf_clust_0:
  3806 0000B1D6 8B35[E44E0100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3807                              <1> csftdf2_read_sf_clust_1:
  3808 0000B1DC 5B                  <1> 	pop	ebx ; *
  3809                              <1> 
  3810                              <1> csftdf2_read_sf_clust_2:
  3811 0000B1DD 89DA                <1> 	mov	edx, ebx
  3812 0000B1DF 0315[D04E0100]      <1> 	add	edx, [csftdf_r_size]
  3813 0000B1E5 81FA00000800        <1> 	cmp	edx, Cluster_Buffer + 65536
  3814 0000B1EB 772F                <1> 	ja	short csftdf2_write_df_cluster
  3815                              <1> 
  3816 0000B1ED E858FFFFFF          <1> 	call	csftdf2_read_file_sectors ; 19/03/2016
  3817 0000B1F2 0F8280020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3818                              <1> 
  3819 0000B1F8 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3820 0000B1FA 7520                <1> 	jnz	short csftdf2_write_df_cluster
  3821                              <1> 
  3822 0000B1FC 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3823 0000B203 76D8                <1> 	jna	short csftdf2_read_sf_clust_2
  3824                              <1> 
  3825 0000B205 53                  <1> 	push	ebx ; *	
  3826                              <1> 
  3827                              <1> 	; Set cursor position
  3828                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3829 0000B206 8A3D[E14E0100]      <1> 	mov	bh, [csftdf_videopage]
  3830 0000B20C 668B15[E24E0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3831 0000B213 B402                <1> 	mov	ah, 2
  3832 0000B215 E88062FFFF          <1> 	call	_int10h
  3833 0000B21A EBB5                <1> 	jmp	short csftdf2_read_sf_clust_next
  3834                              <1> 
  3835                              <1> csftdf2_write_df_cluster:
  3836                              <1> 	; 19/03/2016
  3837 0000B21C 8B35[E84E0100]      <1> 	mov	esi, [csftdf_df_drv_dt]	
  3838 0000B222 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3839                              <1> 
  3840                              <1> csftdf2_write_df_clust_next:
  3841 0000B227 E855000000          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016
  3842 0000B22C 0F8246020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3843                              <1> 
  3844 0000B232 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3845 0000B234 750A                <1> 	jnz	short csftdf2_rw_f_clust_ok
  3846                              <1> 
  3847 0000B236 81FB00000800        <1> 	cmp	ebx, Cluster_Buffer + 65536
  3848 0000B23C 72E9                <1> 	jb	short csftdf2_write_df_clust_next
  3849                              <1> 	
  3850 0000B23E EB82                <1> 	jmp	short csftdf2_read_sf_cluster
  3851                              <1>  
  3852                              <1> csftdf2_rw_f_clust_ok:
  3853 0000B240 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3854 0000B247 0F86B2010000        <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  3855                              <1> 
  3856                              <1> 	; "100%"
  3857 0000B24D BF[4B050100]        <1> 	mov	edi, percentagestr
  3858 0000B252 B031                <1> 	mov	al, '1'
  3859 0000B254 AA                  <1> 	stosb
  3860 0000B255 B030                <1> 	mov	al, '0'
  3861 0000B257 AA                  <1> 	stosb
  3862 0000B258 AA                  <1> 	stosb
  3863                              <1> 
  3864 0000B259 8A3D[E14E0100]      <1> 	mov	bh, [csftdf_videopage]
  3865 0000B25F 668B15[E24E0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3866 0000B266 B402                <1> 	mov	ah, 2
  3867 0000B268 E82D62FFFF          <1> 	call	_int10h
  3868                              <1> 
  3869 0000B26D BE[4B050100]        <1> 	mov	esi, percentagestr
  3870 0000B272 E846B0FFFF          <1> 	call	print_msg
  3871                              <1> 
  3872 0000B277 E983010000          <1>         jmp     csftdf2_save_fat_file_4
  3873                              <1> 
  3874                              <1> csftdf2_load_fs_file:
  3875                              <1> 	; temporary - 18/03/2016
  3876 0000B27C E96F020000          <1>         jmp     csftdf2_read_error
  3877                              <1> 
  3878                              <1> csftdf2_write_file_sectors:
  3879                              <1> 	; 19/03/2016
  3880 0000B281 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3881 0000B285 0F86F1050000        <1>         jna     csftdf2_write_fs_file_sectors
  3882                              <1> 
  3883                              <1> csftdf2_write_fat_file_sectors:
  3884                              <1> 	; 19/03/2016
  3885                              <1> 	; 18/03/2016
  3886                              <1> 	; return:
  3887                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  3888                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  3889                              <1> 	;   CF = 1 -> write error (error code in AL)	
  3890                              <1> 
  3891                              <1> csftdf2_write_fat_file_secs_0:
  3892 0000B28B 8B15[BC4E0100]      <1> 	mov	edx, [csftdf_filesize]
  3893 0000B291 2B15[DC4E0100]      <1> 	sub	edx, [csftdf_df_wbytes]
  3894 0000B297 3B15[D44E0100]      <1> 	cmp	edx, [csftdf_w_size]	
  3895 0000B29D 7306                <1> 	jnb	short csftdf2_write_fat_file_secs_1
  3896 0000B29F 8915[D44E0100]      <1> 	mov	[csftdf_w_size], edx		
  3897                              <1> 
  3898                              <1> csftdf2_write_fat_file_secs_1:
  3899 0000B2A5 A1[D44E0100]        <1> 	mov	eax, [csftdf_w_size]
  3900 0000B2AA 29D2                <1> 	sub	edx, edx
  3901 0000B2AC 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3902 0000B2B0 01C8                <1> 	add	eax, ecx
  3903 0000B2B2 48                  <1> 	dec	eax
  3904 0000B2B3 F7F1                <1> 	div	ecx
  3905 0000B2B5 89C1                <1> 	mov	ecx, eax ; sector count
  3906 0000B2B7 A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster]
  3907                              <1> 
  3908                              <1> 	; EBX = memory block address (current)	
  3909                              <1> 
  3910 0000B2BC E8A20F0000          <1> 	call	write_fat_file_sectors
  3911 0000B2C1 7259                <1> 	jc	short csftdf2_write_fat_file_secs_4
  3912                              <1> 
  3913                              <1> 	; EBX = next memory address
  3914                              <1> 
  3915 0000B2C3 A1[DC4E0100]        <1> 	mov	eax, [csftdf_df_wbytes]
  3916 0000B2C8 0305[D44E0100]      <1> 	add	eax, [csftdf_w_size]
  3917 0000B2CE 8B15[BC4E0100]      <1> 	mov	edx, [csftdf_filesize]
  3918 0000B2D4 39D0                <1> 	cmp	eax, edx
  3919 0000B2D6 7344                <1> 	jnb	short csftdf2_write_fat_file_secs_4
  3920 0000B2D8 A3[DC4E0100]        <1> 	mov	[csftdf_df_wbytes], eax
  3921                              <1> 	;
  3922 0000B2DD A3[7E4E0100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  3923                              <1> 
  3924 0000B2E2 53                  <1> 	push	ebx ; *
  3925                              <1> 
  3926 0000B2E3 803D[BA4E0100]01    <1> 	cmp	byte [DestinationFileFound], 1
  3927 0000B2EA 7210                <1> 	jb	short csftdf2_write_fat_file_secs_2
  3928                              <1> 
  3929                              <1> 	; get next cluster (csftdf_w_size! bytes)
  3930 0000B2EC A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster]
  3931 0000B2F1 E887050000          <1> 	call	get_next_cluster
  3932 0000B2F6 731C                <1> 	jnc	short csftdf2_write_fat_file_secs_3
  3933                              <1> 
  3934 0000B2F8 21C0                <1> 	and	eax, eax ; end of cluster chain!?
  3935 0000B2FA 7521                <1> 	jnz	short csftdf2_write_fat_file_secs_5 ; disk error !
  3936                              <1> 
  3937                              <1> csftdf2_write_fat_file_secs_2:
  3938 0000B2FC A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  3939 0000B301 E8800E0000          <1> 	call	add_new_cluster		
  3940 0000B306 7215                <1> 	jc	short csftdf2_write_fat_file_secs_5
  3941                              <1> 
  3942                              <1> 	; NOTE: Destination file size may be bigger than
  3943                              <1> 	; source file size when the last reading fails after here.
  3944                              <1> 	; (The last -empty- cluster of destination file must be 
  3945                              <1> 	; truncated and LMDT must be current date&time for partial
  3946                              <1> 	; copy result!) 
  3947 0000B308 8B15[D44E0100]      <1> 	mov	edx, [csftdf_w_size] ; bytes per cluster
  3948 0000B30E 0115[7E4E0100]      <1> 	add	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  3949                              <1> 
  3950                              <1> csftdf2_write_fat_file_secs_3:
  3951 0000B314 5B                  <1> 	pop	ebx ; *
  3952 0000B315 29D2                <1> 	sub	edx, edx ; 0
  3953 0000B317 A3[CC4E0100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  3954                              <1> 
  3955                              <1> csftdf2_write_fat_file_secs_4:
  3956 0000B31C C3                  <1> 	retn
  3957                              <1> 
  3958                              <1> csftdf2_write_fat_file_secs_5:
  3959 0000B31D 5B                  <1> 	pop	ebx ; *
  3960                              <1> 	; 16/10/2016 (1Dh -> 18)
  3961 0000B31E B812000000          <1> 	mov	eax, 18 ; Write error !
  3962 0000B323 C3                  <1> 	retn
  3963                              <1> 
  3964                              <1> csftdf2_save_file:
  3965                              <1> 	; 25/03/2016
  3966                              <1> 	; 19/03/2016
  3967                              <1> 	; 18/03/2016
  3968 0000B324 8B35[E84E0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; logical dos drv desc. tbl.
  3969                              <1> 
  3970 0000B32A 8B1D[C04E0100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3971                              <1> 
  3972 0000B330 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3973 0000B334 0F86F4010000        <1>         jna     csftdf2_save_fs_file
  3974                              <1> 
  3975                              <1> csftdf2_save_fat_file:
  3976 0000B33A 53                  <1> 	push	ebx; *
  3977                              <1> 
  3978 0000B33B 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3979 0000B342 7724                <1> 	ja	short csftdf2_save_fat_file_0
  3980                              <1> 
  3981                              <1> 	; Set cursor position
  3982                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3983 0000B344 8A3D[E14E0100]      <1> 	mov	bh, [csftdf_videopage]
  3984 0000B34A 668B15[E24E0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3985 0000B351 B402                <1> 	mov	ah, 2
  3986 0000B353 E84261FFFF          <1> 	call	_int10h
  3987                              <1> 	
  3988 0000B358 BE[3F050100]        <1> 	mov	esi, msg_writing
  3989 0000B35D E85BAFFFFF          <1> 	call	print_msg
  3990                              <1> 
  3991                              <1> csftdf2_save_fat_file_next:
  3992 0000B362 8B35[E84E0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 25/03/2016
  3993                              <1> 
  3994                              <1> csftdf2_save_fat_file_0:
  3995 0000B368 5B                  <1> 	pop	ebx ; *
  3996                              <1> 
  3997                              <1> csftdf2_save_fat_file_1:
  3998 0000B369 E813FFFFFF          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016	
  3999 0000B36E 0F827E010000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  4000                              <1> 
  4001 0000B374 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  4002 0000B376 756D                <1>         jnz     short csftdf2_save_fat_file_3 ; 25/03/2016
  4003                              <1> 
  4004 0000B378 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4005 0000B37F 76E8                <1> 	jna	short csftdf2_save_fat_file_1
  4006                              <1> 
  4007 0000B381 B020                <1> 	mov	al, 20h
  4008 0000B383 BF[4B050100]        <1> 	mov	edi, percentagestr
  4009 0000B388 AA                  <1> 	stosb
  4010 0000B389 AA                  <1> 	stosb
  4011 0000B38A A1[DC4E0100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4012 0000B38F BA64000000          <1> 	mov	edx, 100
  4013 0000B394 F7E2                <1> 	mul	edx
  4014 0000B396 8B0D[BC4E0100]      <1> 	mov	ecx, [csftdf_filesize]	
  4015 0000B39C F7F1                <1> 	div	ecx
  4016 0000B39E B10A                <1> 	mov	cl, 10
  4017 0000B3A0 F6F1                <1> 	div	cl
  4018 0000B3A2 80C430              <1> 	add	ah, '0'
  4019 0000B3A5 8827                <1> 	mov	[edi], ah
  4020 0000B3A7 20C0                <1> 	and	al, al
  4021 0000B3A9 740A                <1> 	jz	short csftdf2_save_fat_file_2
  4022 0000B3AB 4F                  <1> 	dec	edi
  4023 0000B3AC 6698                <1> 	cbw
  4024 0000B3AE F6F1                <1> 	div	cl
  4025 0000B3B0 80C430              <1> 	add	ah, '0'
  4026 0000B3B3 8827                <1> 	mov	[edi], ah
  4027                              <1> 	;and	al, al
  4028                              <1> 	;jz	short csftdf2_save_fat_file_2
  4029                              <1> 	;dec	edi
  4030                              <1> 	;mov	[edi], '1' ; 100%		
  4031                              <1> 
  4032                              <1> csftdf2_save_fat_file_2:
  4033 0000B3B5 53                  <1> 	push	ebx ; *
  4034                              <1> 
  4035 0000B3B6 E802000000          <1> 	call	csftdf2_print_wr_percentage ; 25/03/2016
  4036                              <1> 
  4037 0000B3BB EBA5                <1>         jmp     csftdf2_save_fat_file_next
  4038                              <1> 
  4039                              <1> csftdf2_print_wr_percentage:
  4040                              <1> 	; Set cursor position
  4041                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  4042 0000B3BD 8A3D[E14E0100]      <1> 	mov	bh, [csftdf_videopage]
  4043 0000B3C3 668B15[E24E0100]    <1> 	mov	dx, [csftdf_cursorpos]
  4044 0000B3CA B402                <1> 	mov	ah, 2
  4045 0000B3CC E8C960FFFF          <1> 	call	_int10h
  4046                              <1> 
  4047 0000B3D1 BE[3F050100]        <1> 	mov	esi, msg_writing
  4048 0000B3D6 E8E2AEFFFF          <1> 	call	print_msg
  4049                              <1> 
  4050 0000B3DB BE[4B050100]        <1> 	mov	esi, percentagestr
  4051                              <1> 	;call	print_msg
  4052                              <1> 	;retn
  4053 0000B3E0 E9D8AEFFFF          <1> 	jmp	print_msg
  4054                              <1> 
  4055                              <1> csftdf2_save_fat_file_3:
  4056 0000B3E5 803D[E04E0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4057 0000B3EC 7611                <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  4058                              <1> 
  4059                              <1> 	; "100%"
  4060 0000B3EE BF[4B050100]        <1> 	mov	edi, percentagestr
  4061 0000B3F3 B031                <1> 	mov	al, '1'
  4062 0000B3F5 AA                  <1> 	stosb
  4063 0000B3F6 B030                <1> 	mov	al, '0'
  4064 0000B3F8 AA                  <1> 	stosb
  4065 0000B3F9 AA                  <1> 	stosb
  4066                              <1> 
  4067 0000B3FA E8BEFFFFFF          <1> 	call	csftdf2_print_wr_percentage
  4068                              <1> 
  4069                              <1> csftdf2_save_fat_file_4:
  4070 0000B3FF 803D[BA4E0100]00    <1> 	cmp	byte [DestinationFileFound], 0
  4071 0000B406 7647                <1> 	jna	short csftdf2_save_fat_file_6
  4072                              <1> 
  4073 0000B408 8B35[E84E0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 31/03/2016	
  4074                              <1> 
  4075 0000B40E A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  4076 0000B413 E865040000          <1> 	call	get_next_cluster
  4077 0000B418 7235                <1> 	jc	short csftdf2_save_fat_file_6 ; eocc! or disk error!
  4078                              <1> 
  4079 0000B41A A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  4080                              <1> 	;xor	ecx, ecx
  4081                              <1> 	;mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  4082                              <1> 	;dec	ecx ; 0FFFFFFFFh
  4083                              <1> 	;shr	ecx, 4 ; 28 bit ; 0FFFFFFFh
  4084 0000B41F B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4085 0000B424 E87E070000          <1> 	call	update_cluster
  4086 0000B429 7224                <1> 	jc	short csftdf2_save_fat_file_6 ; really last cluster!?
  4087                              <1> 
  4088 0000B42B A3[CC4E0100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  4089                              <1> 	
  4090                              <1> 	; byte [FAT_BuffValidData] = 2 
  4091 0000B430 E82F0A0000          <1> 	call	save_fat_buffer
  4092 0000B435 730E                <1> 	jnc	short csftdf2_save_fat_file_5
  4093                              <1> 	
  4094 0000B437 8B15[BC4E0100]      <1> 	mov	edx, [csftdf_filesize]
  4095 0000B43D 8915[7E4E0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4096 0000B443 EB58                <1> 	jmp	short csftdf2_save_fat_file_err3
  4097                              <1> 
  4098                              <1> csftdf2_save_fat_file_5:
  4099 0000B445 A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster]
  4100                              <1> 
  4101                              <1> 	; EAX = First cluster to be truncated/unlinked
  4102                              <1> 	; ESI = Logical dos drive description table address
  4103 0000B44A E8580C0000          <1> 	call	truncate_cluster_chain
  4104                              <1> 
  4105                              <1> csftdf2_save_fat_file_6:
  4106                              <1> 	; 28/03/2016
  4107 0000B44F BE[ED4D0100]        <1> 	mov	esi, SourceFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4108 0000B454 BF[6D4E0100]        <1> 	mov	edi, DestinationFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4109 0000B459 A4                  <1> 	movsb ; +11
  4110 0000B45A A5                  <1> 	movsd ; +12 .. +15
  4111 0000B45B 66A5                <1> 	movsw ; +16 .. +17
  4112                              <1> 		; + 18
  4113 0000B45D 83C604              <1> 	add	esi, 4
  4114 0000B460 83C704              <1> 	add	edi, 4
  4115 0000B463 A5                  <1> 	movsd	; DirEntry_WrtTime ; +22 .. +25
  4116                              <1> 
  4117 0000B464 8B15[BC4E0100]      <1> 	mov	edx, [csftdf_filesize]
  4118 0000B46A 8915[7E4E0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4119                              <1> 
  4120 0000B470 E8B7F0FFFF          <1> 	call	convert_current_date_time
  4121                              <1> 	; DX = Date in dos dir entry format
  4122                              <1> 	; AX = Time in dos dir entry format
  4123 0000B475 EB4D                <1> 	jmp	short csftdf2_save_fat_file_7
  4124                              <1> 
  4125                              <1> csftdf2_save_fat_file_err1:
  4126 0000B477 5B                  <1> 	pop	ebx ; *	
  4127                              <1> csftdf2_save_fat_file_err2:
  4128 0000B478 A1[DC4E0100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4129 0000B47D 8B15[7E4E0100]      <1> 	mov	edx, [DestinationFile_DirEntry+DirEntry_FileSize]
  4130 0000B483 39C2                <1> 	cmp	edx, eax
  4131 0000B485 7616                <1> 	jna	short csftdf2_save_fat_file_err3
  4132 0000B487 A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last (empty) cluster
  4133                              <1> 	; ESI = Logical dos drive description table address
  4134 0000B48C E8160C0000          <1> 	call	truncate_cluster_chain
  4135 0000B491 720A                <1> 	jc	short csftdf2_save_fat_file_err3
  4136 0000B493 A1[DC4E0100]        <1> 	mov	eax, [csftdf_df_wbytes]	
  4137 0000B498 A3[7E4E0100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  4138                              <1> csftdf2_save_fat_file_err3:
  4139 0000B49D E88AF0FFFF          <1> 	call	convert_current_date_time
  4140                              <1> 	; DX = Date in dos dir entry format
  4141                              <1> 	; AX = Time in dos dir entry format
  4142 0000B4A2 C605[6F4E0100]00    <1> 	mov	byte [DestinationFile_DirEntry+DirEntry_CrtTimeTenth], 0
  4143 0000B4A9 66A3[704E0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtTime], ax
  4144 0000B4AF 668915[724E0100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtDate], dx		
  4145 0000B4B6 66A3[784E0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtTime], ax
  4146 0000B4BC 668915[7A4E0100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtDate], dx
  4147 0000B4C3 F9                  <1> 	stc
  4148                              <1> csftdf2_save_fat_file_7:
  4149 0000B4C4 9C                  <1> 	pushf
  4150 0000B4C5 668915[744E0100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_LastAccDate], dx
  4151 0000B4CC BE[624E0100]        <1> 	mov	esi, DestinationFile_DirEntry
  4152 0000B4D1 BF00000800          <1> 	mov	edi, Directory_Buffer
  4153 0000B4D6 0FB70D[8A4E0100]    <1> 	movzx	ecx, word [DestinationFile_DirEntryNumber] ; (<2048)
  4154 0000B4DD 66C1E105            <1> 	shl	cx, 5 ; 32 * directory entry number
  4155 0000B4E1 01CF                <1> 	add	edi, ecx
  4156                              <1> 	;mov	ecx, 8
  4157 0000B4E3 66B90800            <1> 	mov	cx, 8
  4158 0000B4E7 F3A5                <1> 	rep	movsd
  4159 0000B4E9 9D                  <1> 	popf
  4160 0000B4EA 730B                <1> 	jnc	short csftdf2_write_file_OK
  4161                              <1> 	 		
  4162                              <1> csftdf2_write_error:
  4163                              <1> 	; 18/03/2016
  4164 0000B4EC B01D                <1> 	mov	al, 1Dh ; write error
  4165 0000B4EE EB02                <1> 	jmp	short csftdf2_rw_error
  4166                              <1> 
  4167                              <1> 	; 16/03/2016
  4168                              <1> csftdf2_read_error:
  4169 0000B4F0 B011                <1> 	mov	al, 17 ; ; Drive not ready or read error!
  4170                              <1> csftdf2_rw_error:
  4171 0000B4F2 A2[B94E0100]        <1> 	mov	[csftdf_rw_err], al 
  4172                              <1> 
  4173                              <1> csftdf2_write_file_OK:
  4174                              <1> 	; 18/03/2016
  4175 0000B4F7 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  4176 0000B4FE E8C7F0FFFF          <1> 	call	save_directory_buffer
  4177                              <1> 
  4178                              <1>  	; Update last modification date&time of destination
  4179                              <1> 	; file's (parent) directory
  4180 0000B503 E85DF1FFFF          <1> 	call	update_parent_dir_lmdt
  4181                              <1> 	;
  4182 0000B508 A1[C04E0100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  4183                              <1> 
  4184 0000B50D 21C0                <1> 	and	eax, eax
  4185 0000B50F 750E                <1> 	jnz	short csftdf2_dealloc_mblock
  4186                              <1> 
  4187 0000B511 88C5                <1> 	mov	ch, al ; 0 (Cluster r/w, not full loading)
  4188                              <1> csftdf2_dealloc_retn:
  4189 0000B513 8A0D[B94E0100]      <1> 	mov	cl, [csftdf_rw_err]
  4190 0000B519 A1[CC4E0100]        <1> 	mov	eax, [csftdf_df_cluster]
  4191 0000B51E C3                  <1> 	retn
  4192                              <1> 
  4193                              <1> csftdf2_dealloc_mblock:
  4194 0000B51F 8B0D[C44E0100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  4195 0000B525 E8FAA0FFFF          <1> 	call	deallocate_memory_block
  4196 0000B52A B5FF                <1>         mov     ch, 0FFh ; (File was full loaded at memory)
  4197 0000B52C EBE5                <1> 	jmp	short csftdf2_dealloc_retn
  4198                              <1> 
  4199                              <1> csftdf2_save_fs_file:
  4200                              <1> 	; 16/10/2016 (1Dh -> 18)
  4201                              <1> 	; temporary - (21/03/2016)
  4202 0000B52E B812000000          <1> 	mov	eax, 18 ; write error
  4203 0000B533 F9                  <1> 	stc
  4204 0000B534 C3                  <1> 	retn
  4205                              <1> 
  4206                              <1> create_file:
  4207                              <1> 	; 16/10/2016
  4208                              <1> 	; 24/03/2016, 31/03/2016
  4209                              <1> 	; 20/03/2016, 21/03/2016, 23/03/2016
  4210                              <1> 	; 19/03/2016 (TRDOS 396 = TRDOS v2.0)
  4211                              <1> 	; 03/09/2011 (FILE.ASM, 'proc_create_file')
  4212                              <1> 	; 09/08/2010
  4213                              <1> 	;
  4214                              <1> 	; INPUT ->
  4215                              <1> 	; 	EAX = File Size
  4216                              <1> 	; 	ESI = ASCIIZ File Name
  4217                              <1> 	; 	CL = File Attributes 
  4218                              <1> 	;	EBX = FFFFFFFFh -> create empty file 
  4219                              <1> 	;			 (only for FAT fs) 
  4220                              <1> 	; OUTPUT ->
  4221                              <1> 	;     CF = 0 ->
  4222                              <1> 	;	EAX = New file's first cluster
  4223                              <1> 	; 	ESI = Logical Dos Drv Descr. Table Addr.
  4224                              <1> 	; 	EBX = offset CreateFile_Size
  4225                              <1> 	; 	ECX = Sectors per cluster (<256) 
  4226                              <1> 	; 	EDX = Directory entry index/number (<65536)
  4227                              <1> 	;     CF = 1 -> error code in AL
  4228                              <1> 
  4229                              <1> ;	test	cl, 18h (directory or volume name)
  4230                              <1> ;	jnz	short loc_createfile_access_denied
  4231 0000B535 80E107              <1> 	and	cl, 07h ; S, H, R
  4232 0000B538 880D[084F0100]      <1>         mov     [createfile_attrib], cl 
  4233                              <1> 
  4234 0000B53E 89D9                <1> 	mov	ecx, ebx
  4235 0000B540 89F3                <1> 	mov	ebx, esi ; ASCIIZ File Name address
  4236 0000B542 29D2                <1> 	sub	edx, edx
  4237 0000B544 8A35[A6420100]      <1>         mov     dh, [Current_Drv]
  4238 0000B54A BE00010900          <1>         mov     esi, Logical_DOSDisks
  4239 0000B54F 01D6                <1> 	add	esi, edx
  4240                              <1> 
  4241 0000B551 8815[134F0100]      <1> 	mov	[createfile_UpdatePDir], dl ; 0 ; 31/03/2016 
  4242                              <1> 
  4243                              <1> 	; LD_DiskType = 0 for write protection (read only) 
  4244 0000B557 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  4245 0000B55B 730A                <1> 	jnb	short loc_createfile_check_file_sytem
  4246                              <1> 	; 16/10/2016 (TRDOS Error code: 30, disk write protected) 
  4247 0000B55D B81E000000          <1> 	mov	eax, 30 ; 13h, MSDOS err : Disk write-protected 
  4248 0000B562 66BA0000            <1> 	mov	dx, 0
  4249                              <1> 	; err retn: EDX = 0, EBX = File name offset
  4250                              <1> 	; ESI -> Dos drive description table address	
  4251 0000B566 C3                  <1> 	retn
  4252                              <1> 
  4253                              <1> ;loc_createfile_access_denied:
  4254                              <1> ;	mov	eax, 05h ; access denied (invalid attributes input)
  4255                              <1> ;	stc
  4256                              <1> ;	retn
  4257                              <1> 
  4258                              <1> loc_createfile_check_file_sytem:
  4259 0000B567 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  4260 0000B56B 730A                <1> 	jnb	short loc_createfile_chk_empty_FAT_file_sign1
  4261                              <1> 
  4262 0000B56D A3[F44E0100]        <1> 	mov	[createfile_size], eax
  4263                              <1> 	; ESI = Logical Dos Drive Description Table address
  4264                              <1> 	; EBX = ASCIIZ File Name address
  4265 0000B572 E9FE020000          <1> 	jmp	create_fs_file
  4266                              <1> 
  4267                              <1> loc_createfile_chk_empty_FAT_file_sign1:
  4268                              <1> 	; ECX = FFFFFFFFh -> create empty file if drive has FAT fs
  4269 0000B577 41                  <1> 	inc	ecx
  4270 0000B578 7506                <1> 	jnz	short loc_createfile_chk_empty_FAT_file_sign2
  4271 0000B57A 890D[F44E0100]      <1> 	mov	[createfile_size], ecx ; 0 ; empty file
  4272                              <1> 
  4273                              <1> loc_createfile_chk_empty_FAT_file_sign2:
  4274                              <1> 	; 23/03/2016
  4275 0000B580 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec]
  4276 0000B584 66890D[104F0100]    <1> 	mov	[createfile_BytesPerSec], cx
  4277                              <1> 	
  4278                              <1> 	; EBX = ASCIIZ File Name address
  4279 0000B58B 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  4280 0000B58F 8815[094F0100]      <1> 	mov	[createfile_SecPerClust], dl
  4281 0000B595 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  4282 0000B598 39D1                <1> 	cmp	ecx, edx ; byte [createfile_SecPerClust]
  4283 0000B59A 7306                <1> 	jnb	short loc_create_fat_file
  4284                              <1> 	  
  4285                              <1> loc_createfile_insufficient_disk_space:
  4286 0000B59C B827000000          <1> 	mov	eax, 27h
  4287                              <1> loc_createfile_gffc_retn:
  4288 0000B5A1 C3                  <1> 	retn
  4289                              <1> 
  4290                              <1> loc_create_fat_file:
  4291 0000B5A2 891D[EC4E0100]      <1> 	mov	[createfile_Name_Offset], ebx
  4292 0000B5A8 890D[F04E0100]      <1> 	mov	[createfile_FreeSectors], ecx
  4293                              <1> 
  4294                              <1> loc_createfile_gffc_1:
  4295 0000B5AE E821050000          <1> 	call	get_first_free_cluster
  4296 0000B5B3 72EC                <1> 	jc	short loc_createfile_gffc_retn
  4297                              <1> 
  4298 0000B5B5 A3[F84E0100]        <1> 	mov	[createfile_FFCluster], eax
  4299                              <1> 
  4300                              <1> loc_createfile_locate_ffe_on_directory:
  4301                              <1> 	; Current directory fcluster <> Directory buffer cluster
  4302                              <1> 	; Current directory will be reloaded by
  4303                              <1> 	; 'locate_current_dir_file' procedure
  4304                              <1> 	;
  4305                              <1> 	; ESI = Logical Dos Drv Desc. Table Adress
  4306 0000B5BA 56                  <1> 	push	esi ; *
  4307 0000B5BB 31C0                <1> 	xor	eax, eax
  4308                              <1> 
  4309 0000B5BD A3[C64A0100]        <1> 	mov	dword [FAT_ClusterCounter], eax ; 0
  4310                              <1> 	; 21/03/2016
  4311 0000B5C2 A2[124F0100]        <1> 	mov	byte [createfile_wfc], al ; 0 
  4312                              <1> 
  4313 0000B5C7 89C1                <1>  	mov	ecx, eax
  4314 0000B5C9 6649                <1> 	dec	cx ; FFFFh  
  4315                              <1> 	; CX = FFFFh -> find first deleted or free entry
  4316                              <1> 	; ESI would be ASCIIZ filename address if the call
  4317                              <1> 	; would not be for first free or deleted dir entry  
  4318 0000B5CB E8D6E7FFFF          <1> 	call	locate_current_dir_file
  4319 0000B5D0 0F83EE000000        <1> 	jnc	loc_createfile_set_ff_dir_entry
  4320 0000B5D6 5E                  <1> 	pop	esi ; *
  4321                              <1> 	 ; ESI = Logical DOS Drv. Description Table Address 
  4322 0000B5D7 83F802              <1> 	cmp	eax, 2
  4323 0000B5DA 7402                <1> 	je	short loc_createfile_add_new_cluster
  4324                              <1> loc_createfile_locate_file_stc_retn:
  4325 0000B5DC F9                  <1> 	stc
  4326 0000B5DD C3                  <1> 	retn
  4327                              <1> 
  4328                              <1> loc_createfile_add_new_cluster:
  4329 0000B5DE 803D[A5420100]02    <1> 	cmp	byte [Current_FATType], 2
  4330                              <1> 	;cmp	byte [esi+LD_FATType], 2
  4331 0000B5E5 770C                <1> 	ja	short loc_createfile_add_new_cluster_check_fsc
  4332 0000B5E7 803D[A4420100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  4333                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  4334 0000B5EE 7303                <1> 	jnb	short loc_createfile_add_new_cluster_check_fsc
  4335                              <1> 	
  4336                              <1> 	;mov	eax, 12
  4337 0000B5F0 B00C                <1> 	mov	al, 12 ; No more files 
  4338                              <1> 
  4339                              <1> loc_createfile_anc_retn:
  4340 0000B5F2 C3                  <1> 	retn
  4341                              <1> 
  4342                              <1> loc_createfile_add_new_cluster_check_fsc:
  4343 0000B5F3 8B0D[F04E0100]      <1> 	mov	ecx, [createfile_FreeSectors]
  4344 0000B5F9 0FB605[094F0100]    <1> 	movzx	eax, byte [createfile_SecPerClust]
  4345 0000B600 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  4346 0000B603 39C1                <1> 	cmp	ecx, eax
  4347 0000B605 7295                <1>         jb	short loc_createfile_insufficient_disk_space
  4348                              <1> 
  4349                              <1> loc_createfile_add_new_subdir_cluster:
  4350 0000B607 8B15[D54A0100]      <1> 	mov	edx, [DirBuff_Cluster]
  4351 0000B60D 8915[FC4E0100]      <1> 	mov	[createfile_LastDirCluster], edx	
  4352                              <1> 
  4353 0000B613 A1[F84E0100]        <1> 	mov	eax, [createfile_FFCluster]
  4354 0000B618 E846040000          <1> 	call	load_FAT_sub_directory 
  4355 0000B61D 72D3                <1> 	jc	short loc_createfile_anc_retn
  4356                              <1> 
  4357                              <1> pass_createfile_add_new_subdir_cluster:
  4358                              <1> 	;movzx	eax, word [esi+LD_BPB+BytesPerSec]
  4359 0000B61F 0FB705[104F0100]    <1> 	movzx	eax, word [createfile_BytesPerSec] ; 23/03/2016
  4360 0000B626 F7E1                <1> 	mul	ecx ; ecx = directory buffer sector count
  4361 0000B628 89C1                <1> 	mov	ecx, eax
  4362 0000B62A C1E902              <1> 	shr	ecx, 2 ; dword count
  4363 0000B62D 29C0                <1> 	sub	eax, eax ; 0
  4364 0000B62F F3AB                <1> 	rep	stosd 
  4365                              <1> 	;
  4366 0000B631 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4367 0000B638 E88DEFFFFF          <1> 	call	save_directory_buffer
  4368 0000B63D 72B3                <1> 	jc	short loc_createfile_anc_retn
  4369                              <1> 
  4370                              <1> loc_createfile_save_added_subdir_cluster:
  4371 0000B63F A1[FC4E0100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4372 0000B644 8B0D[F84E0100]      <1> 	mov	ecx, [createfile_FFCluster]
  4373 0000B64A E858050000          <1> 	call	update_cluster
  4374 0000B64F 7304                <1> 	jnc	short loc_createfile_save_fat_buffer_0
  4375 0000B651 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4376 0000B653 751A                <1> 	jnz	short loc_createfile_save_fat_buffer_stc_retn
  4377                              <1> 
  4378                              <1> loc_createfile_save_fat_buffer_0:
  4379 0000B655 A1[F84E0100]        <1> 	mov	eax, [createfile_FFCluster]
  4380 0000B65A A3[FC4E0100]        <1> 	mov	[createfile_LastDirCluster], eax
  4381 0000B65F B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh ; 28 bit
  4382 0000B664 E83E050000          <1> 	call	update_cluster
  4383 0000B669 7306                <1> 	jnc	short loc_createfile_save_fat_buffer_1
  4384 0000B66B 09C0                <1> 	or	eax, eax ; Was it free cluster
  4385 0000B66D 7402                <1> 	jz	short loc_createfile_save_fat_buffer_1
  4386                              <1> 
  4387                              <1> loc_createfile_save_fat_buffer_stc_retn:
  4388 0000B66F F9                  <1> 	stc
  4389                              <1> loc_createfile_save_fat_buffer_retn:
  4390                              <1> loc_createfile_gffc_2_stc_retn:
  4391 0000B670 C3                  <1> 	retn
  4392                              <1> 
  4393                              <1> loc_createfile_save_fat_buffer_1:
  4394                              <1> 	; byte [FAT_BuffValidData] = 2 
  4395 0000B671 E8EE070000          <1> 	call	save_fat_buffer
  4396 0000B676 72F8                <1> 	jc	short loc_createfile_save_fat_buffer_retn
  4397                              <1> 
  4398 0000B678 803D[C64A0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4399 0000B67F 7222                <1> 	jb	short loc_createfile_save_fat_buffer_2
  4400                              <1> 
  4401                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4402 0000B681 A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4403                              <1> 
  4404 0000B686 C605[C64A0100]00    <1> 	mov	byte [FAT_ClusterCounter], 0 ; 21/03/2016
  4405                              <1> 
  4406 0000B68D 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4407 0000B691 E863080000          <1> 	call	calculate_fat_freespace
  4408                              <1> 
  4409                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  4410                              <1> 	;jnz	short loc_createfile_save_fat_buffer_2
  4411                              <1> 
  4412                              <1> 	; ecx > 0 -> Recalculation is needed
  4413 0000B696 09C9                <1> 	or	ecx, ecx 
  4414 0000B698 7409                <1> 	jz	short loc_createfile_save_fat_buffer_2
  4415                              <1> 
  4416 0000B69A 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4417 0000B69E E856080000          <1> 	call	calculate_fat_freespace
  4418                              <1> 
  4419                              <1> loc_createfile_save_fat_buffer_2:
  4420                              <1> 	;call	update_parent_dir_lmdt
  4421                              <1> 
  4422                              <1> loc_createfile_gffc_2:
  4423 0000B6A3 E82C040000          <1> 	call	get_first_free_cluster
  4424 0000B6A8 72C6                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4425                              <1> 
  4426 0000B6AA A3[F84E0100]        <1> 	mov	[createfile_FFCluster], eax
  4427                              <1> 
  4428 0000B6AF A1[FC4E0100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4429                              <1> 	
  4430 0000B6B4 E8AA030000          <1> 	call	load_FAT_sub_directory 
  4431 0000B6B9 72B5                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4432                              <1> 
  4433 0000B6BB BF00000800          <1> 	mov	edi, Directory_Buffer
  4434                              <1> 
  4435 0000B6C0 6629DB              <1> 	sub	bx, bx ; directory entry index/number = 0
  4436                              <1> 
  4437 0000B6C3 56                  <1> 	push	esi ; * ; 23/03/2016
  4438                              <1> 
  4439                              <1> loc_createfile_set_ff_dir_entry:
  4440 0000B6C4 66891D[0A4F0100]    <1> 	mov	[createfile_DirIndex], bx
  4441                              <1> 
  4442                              <1>         ; EDI = Directory entry address
  4443 0000B6CB 8B35[EC4E0100]      <1> 	mov	esi, [createfile_Name_Offset]
  4444 0000B6D1 A1[F84E0100]        <1> 	mov	eax, [createfile_FFCluster]
  4445 0000B6D6 A3[004F0100]        <1> 	mov	[createfile_Cluster], eax ; 24/03/2016
  4446 0000B6DB B5FF                <1> 	mov	ch, 0FFh
  4447 0000B6DD 8A0D[084F0100]      <1>         mov	cl, [createfile_attrib] ; file attributes
  4448                              <1> 	; CH > 0 -> File size is in [EBX]
  4449 0000B6E3 BB[F44E0100]        <1> 	mov	ebx, createfile_size
  4450                              <1>   
  4451 0000B6E8 E800EEFFFF          <1> 	call	make_directory_entry
  4452                              <1> 	
  4453 0000B6ED 5E                  <1> 	pop	esi ; * ; ESI = Logical Dos Drv Desc. Table address
  4454                              <1> 
  4455 0000B6EE C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4456 0000B6F5 E8D0EEFFFF          <1> 	call	save_directory_buffer
  4457 0000B6FA 7221                <1> 	jc	short loc_createfile_set_ff_dir_entry_retn
  4458                              <1> 
  4459 0000B6FC C605[134F0100]01    <1> 	mov	byte [createfile_UpdatePDir], 1 ; 31/03/2016 
  4460                              <1> 
  4461                              <1> loc_createfile_get_set_write_file_cluster:
  4462 0000B703 A1[F44E0100]        <1> 	mov	eax, [createfile_size]
  4463 0000B708 09C0                <1> 	or	eax, eax
  4464 0000B70A 7570                <1> 	jnz	short loc_createfile_get_set_wfc_cont
  4465 0000B70C 40                  <1> 	inc	eax
  4466                              <1> 	; 23/03/2016
  4467 0000B70D 0FB61D[094F0100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4468                              <1> 	;movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 512
  4469 0000B714 0FB70D[104F0100]    <1>         movzx   ecx, word [createfile_BytesPerSec] ; 512
  4470 0000B71B EB7C                <1> 	jmp	loc_createfile_set_cluster_count 
  4471                              <1> 
  4472                              <1> loc_createfile_set_ff_dir_entry_retn:
  4473 0000B71D C3                  <1> 	retn
  4474                              <1> 
  4475                              <1> loc_createfile_write_fcluster_to_disk:
  4476 0000B71E 034668              <1> 	add	eax, [esi+LD_DATABegin] ; convert to physical address
  4477 0000B721 BB00000700          <1> 	mov	ebx, Cluster_Buffer
  4478                              <1> 	; ESI = Logical DOS Drv. Desc. Tbl. address
  4479                              <1> 	; EAX = Disk address
  4480                              <1> 	; EBX = Sector Buffer
  4481                              <1> 	; ECX = sectors per cluster
  4482 0000B726 E8AF390000          <1> 	call	disk_write
  4483 0000B72B 7211                <1> 	jc	short loc_createfile_dsk_wr_err
  4484                              <1> 
  4485                              <1> loc_createfile_update_fat_cluster:
  4486                              <1> 	; 21/03/2016	
  4487 0000B72D 803D[124F0100]00    <1> 	cmp	byte [createfile_wfc], 0 
  4488 0000B734 7712                <1> 	ja	short loc_createfile_update_fat_cluster_n1
  4489                              <1> 
  4490 0000B736 FE05[124F0100]      <1> 	inc	byte [createfile_wfc] ; 1
  4491 0000B73C EB24                <1> 	jmp	short loc_createfile_update_fat_cluster_n2
  4492                              <1> 
  4493                              <1> loc_createfile_dsk_wr_err:
  4494                              <1> 	; 16/10/2016 (1Dh -> 18)
  4495                              <1> 	; 23/03/2016
  4496 0000B73E B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  4497 0000B743 E9BD000000          <1> 	jmp	loc_createfile_stc_retn
  4498                              <1> 
  4499                              <1> loc_createfile_update_fat_cluster_n1:
  4500 0000B748 A1[044F0100]        <1> 	mov	eax, [createfile_PCluster]
  4501 0000B74D 8B0D[004F0100]      <1> 	mov	ecx, [createfile_Cluster]
  4502 0000B753 E84F040000          <1> 	call	update_cluster
  4503 0000B758 7308                <1> 	jnc	short loc_createfile_update_fat_cluster_n2
  4504 0000B75A 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4505 0000B75C 0F85A3000000        <1> 	jnz	loc_createfile_stc_retn
  4506                              <1> 
  4507                              <1> loc_createfile_update_fat_cluster_n2:
  4508 0000B762 A1[004F0100]        <1>         mov	eax, [createfile_Cluster]
  4509 0000B767 B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4510 0000B76C E836040000          <1> 	call	update_cluster
  4511 0000B771 734E                <1> 	jnc	short loc_createfile_save_fat_buffer_3
  4512 0000B773 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4513 0000B775 744A                <1> 	jz	short loc_createfile_save_fat_buffer_3
  4514                              <1> 
  4515                              <1> loc_createfile_upd_fat_fcluster_stc_retn:
  4516 0000B777 E989000000          <1> 	jmp	loc_createfile_stc_retn
  4517                              <1> 
  4518                              <1> loc_createfile_get_set_wfc_cont:
  4519                              <1> 	;movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 512	
  4520 0000B77C 0FB70D[104F0100]    <1> 	movzx	ecx, word [createfile_BytesPerSec] ; 512
  4521 0000B783 01C8                <1> 	add	eax, ecx
  4522 0000B785 48                  <1> 	dec	eax  ; add eax, 511
  4523 0000B786 29D2                <1> 	sub	edx, edx
  4524 0000B788 F7F1                <1> 	div	ecx
  4525 0000B78A 0FB61D[094F0100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4526 0000B791 01D8                <1> 	add	eax, ebx
  4527 0000B793 48                  <1> 	dec	eax  ; add eax, SecPerClust - 1
  4528 0000B794 6631D2              <1> 	xor	dx, dx
  4529 0000B797 F7F3                <1> 	div	ebx
  4530                              <1> 
  4531                              <1> loc_createfile_set_cluster_count:
  4532 0000B799 A3[0C4F0100]        <1> 	mov 	[createfile_CCount], eax
  4533                              <1> 	
  4534 0000B79E BF00000700          <1> 	mov	edi, Cluster_Buffer
  4535 0000B7A3 89C8                <1> 	mov	eax, ecx ; Bytes per Sector
  4536 0000B7A5 F7E3                <1> 	mul	ebx ; Sectors per Cluster 
  4537                              <1> 	; EAX = Bytes per Cluster
  4538 0000B7A7 89C1                <1> 	mov	ecx, eax
  4539 0000B7A9 C1E902              <1> 	shr	ecx, 2 ; dword count
  4540 0000B7AC 31C0                <1> 	xor	eax, eax
  4541 0000B7AE F3AB                <1> 	rep	stosd ; clear cluster buffer
  4542                              <1> 
  4543 0000B7B0 A1[004F0100]        <1> 	mov	eax, [createfile_Cluster] ; 24/03/2016
  4544                              <1> 
  4545 0000B7B5 89D9                <1> 	mov	ecx, ebx
  4546                              <1> 
  4547                              <1> loc_createfile_get_set_wf_fclust_cont:
  4548 0000B7B7 83E802              <1> 	sub	eax, 2
  4549 0000B7BA F7E1                <1> 	mul	ecx
  4550                              <1> 	; EAX = Logical DOS disk address (offset)
  4551 0000B7BC E95DFFFFFF          <1>         jmp     loc_createfile_write_fcluster_to_disk
  4552                              <1> 
  4553                              <1> loc_createfile_save_fat_buffer_3:
  4554                              <1> 	; byte [FAT_BuffValidData] = 2
  4555 0000B7C1 E89E060000          <1> 	call	save_fat_buffer
  4556 0000B7C6 723D                <1> 	jc	loc_createfile_stc_retn
  4557                              <1> 
  4558                              <1> 	; 21/03/2016
  4559 0000B7C8 803D[C64A0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4560 0000B7CF 721B                <1> 	jb	short loc_createfile_save_fat_buffer_4
  4561                              <1> 
  4562                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4563 0000B7D1 A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4564 0000B7D6 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4565 0000B7DA E81A070000          <1> 	call	calculate_fat_freespace
  4566                              <1> 
  4567                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  4568                              <1> 	;jnz	short loc_createfile_save_fat_buffer_4
  4569                              <1> 
  4570                              <1> 	; ecx > 0 -> Recalculation is needed
  4571 0000B7DF 09C9                <1> 	or	ecx, ecx 
  4572 0000B7E1 7409                <1> 	jz	short loc_createfile_save_fat_buffer_4
  4573                              <1> 
  4574 0000B7E3 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4575 0000B7E7 E80D070000          <1> 	call	calculate_fat_freespace
  4576                              <1> 
  4577                              <1> loc_createfile_save_fat_buffer_4:
  4578 0000B7EC FF0D[0C4F0100]      <1> 	dec	dword [createfile_CCount]
  4579                              <1> 	;jz	short loc_createfile_upd_dir_modif_date_time
  4580 0000B7F2 743F                <1> 	jz	short loc_createfile_stc_retn_cc ; 31/03/2016
  4581                              <1> 
  4582                              <1> loc_createfile_get_set_write_next_cluster:
  4583 0000B7F4 E8DB020000          <1> 	call	get_first_free_cluster
  4584 0000B7F9 720A                <1> 	jc	short loc_createfile_stc_retn
  4585                              <1> 
  4586                              <1> loc_createfile_get_set_write_next_cluster_1:
  4587 0000B7FB 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  4588 0000B7FE 7213                <1> 	jb	short loc_createfile_get_set_write_next_cluster_2
  4589                              <1> 
  4590                              <1> loc_createfile_wnc_insufficient_disk_space:	
  4591 0000B800 B827000000          <1> 	mov	eax, 27h ; Insufficient disk space
  4592                              <1> 
  4593                              <1> loc_createfile_stc_retn:
  4594 0000B805 803D[124F0100]01    <1> 	cmp	byte [createfile_wfc], 1
  4595 0000B80C 7324                <1> 	jnb	short loc_createfile_err_retn
  4596 0000B80E C3                  <1> 	retn
  4597                              <1> 
  4598                              <1> loc_createfile_wnc_inv_format_retn:
  4599                              <1> 	;mov	eax, 28
  4600 0000B80F B01C                <1> 	mov	al, 28 ; Invalid format
  4601 0000B811 EBF2                <1> 	jmp	short loc_createfile_stc_retn
  4602                              <1> 	         
  4603                              <1> loc_createfile_get_set_write_next_cluster_2:
  4604 0000B813 83F802              <1> 	cmp	eax, 2
  4605 0000B816 72F7                <1> 	jb	short loc_createfile_wnc_inv_format_retn
  4606                              <1> 
  4607                              <1> loc_createfile_get_set_write_next_cluster_3:
  4608 0000B818 8B0D[004F0100]      <1> 	mov	ecx, [createfile_Cluster]
  4609 0000B81E A3[004F0100]        <1> 	mov	[createfile_Cluster], eax
  4610 0000B823 890D[044F0100]      <1> 	mov	[createfile_PCluster], ecx
  4611 0000B829 0FB60D[094F0100]    <1> 	movzx	ecx, byte [createfile_SecPerClust]
  4612 0000B830 EB85                <1> 	jmp	short loc_createfile_get_set_wf_fclust_cont
  4613                              <1> 
  4614                              <1> loc_createfile_err_retn:
  4615 0000B832 F9                  <1> 	stc
  4616                              <1> 
  4617                              <1> ;loc_createfile_upd_dir_modif_date_time:
  4618                              <1> loc_createfile_stc_retn_cc: ; 31/03/2016
  4619 0000B833 9C                  <1> 	pushf	; cpu is here for an error return or completion 
  4620 0000B834 50                  <1> 	push	eax ; error code if cf = 1
  4621                              <1> 
  4622                              <1> 	;call	update_parent_dir_lmdt
  4623                              <1> 
  4624                              <1> ;loc_createfile_stc_retn_cc:
  4625 0000B835 A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4626 0000B83A 09C0                <1> 	or	eax, eax
  4627 0000B83C 741A                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4628 0000B83E 8A3D[A6420100]      <1> 	mov	bh, [Current_Drv]
  4629 0000B844 B301                <1> 	mov	bl, 01h ; BL = 1 -> add clusters
  4630                              <1> 	; NOTE: EAX value will be added to Free Cluster Count
  4631                              <1> 	; (If EAX value is negative, Free Cluster Count will be decreased)
  4632 0000B846 E8AE060000          <1>   	call	calculate_fat_freespace
  4633                              <1>         ; ESI = Logical DOS Drive Description Table Address 
  4634                              <1>         ;jc	short loc_createfile_stc_retn_pop_eax_cf
  4635 0000B84B 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  4636 0000B84D 7409                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4637                              <1> 
  4638                              <1> loc_createfile_stc_retn_recalc_FAT_freespace:
  4639 0000B84F 66BB00FF            <1> 	mov	bx, 0FF00h ; bh = 0FFh -> 
  4640                              <1> 	; ESI = Logical DOS Drv DT Addr
  4641                              <1> 	; BL = 0 -> Recalculate 
  4642 0000B853 E8A1060000          <1> 	call	calculate_fat_freespace
  4643                              <1> 
  4644                              <1> loc_createfile_stc_retn_pop_eax:
  4645 0000B858 58                  <1> 	pop	eax
  4646 0000B859 9D                  <1> 	popf
  4647 0000B85A 7218                <1> 	jc	short loc_createfile_retn
  4648                              <1> 
  4649                              <1> loc_createfile_retn_fcluster:
  4650 0000B85C A1[F84E0100]        <1> 	mov	eax, [createfile_FFCluster]
  4651 0000B861 BB[F44E0100]        <1> 	mov	ebx, createfile_size
  4652                              <1> 	;movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  4653 0000B866 0FB60D[094F0100]    <1> 	movzx	ecx, byte [createfile_SecPerClust] ; 23/03/2016
  4654 0000B86D 0FB715[0A4F0100]    <1> 	movzx	edx, word [createfile_DirIndex]
  4655                              <1> 
  4656                              <1> loc_createfile_retn:
  4657 0000B874 C3                  <1> 	retn
  4658                              <1> 
  4659                              <1> create_fs_file:
  4660                              <1> 	; temporary (21/03/2016)
  4661 0000B875 C3                  <1> 	retn
  4662                              <1> 
  4663                              <1> delete_fs_file:
  4664                              <1> 	; temporary (28/02/2016)
  4665 0000B876 C3                  <1> 	retn
  4666                              <1> 
  4667                              <1> rename_fs_file_or_directory:
  4668 0000B877 C3                  <1> 	retn
  4669                              <1> 
  4670                              <1> make_fs_directory:
  4671                              <1> 	; temporary (21/02/2016)
  4672 0000B878 C3                  <1> 	retn
  4673                              <1> 
  4674                              <1> add_new_fs_section:
  4675                              <1> 	; temporary (11/03/2016)
  4676 0000B879 C3                  <1> 	retn
  4677                              <1> 
  4678                              <1> delete_fs_directory_entry:
  4679                              <1> 	; temporary (11/03/2016)
  4680 0000B87A C3                  <1> 	retn
  4681                              <1> 
  4682                              <1> csftdf2_read_fs_file_sectors:
  4683                              <1> 	; temporary (19/03/2016)
  4684 0000B87B C3                  <1> 	retn
  4685                              <1> 
  4686                              <1> csftdf2_write_fs_file_sectors:
  4687                              <1> 	; temporary (19/03/2016)
  4688 0000B87C C3                  <1> 	retn
  2308                                  %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 0000B87D A3[BA4A0100]        <1> 	mov	[FAT_CurrentCluster], eax
    35                              <1> check_next_cluster_fat_type:
    36 0000B882 29D2                <1> 	sub	edx, edx ; 0
    37 0000B884 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
    38 0000B888 7250                <1> 	jb	short get_FAT12_next_cluster
    39 0000B88A 0F87AF000000        <1>         ja      get_FAT32_next_cluster
    40                              <1> get_FAT16_next_cluster:
    41 0000B890 BB00030000          <1> 	mov	ebx, 300h ;768
    42 0000B895 F7F3                <1> 	div	ebx
    43                              <1> 	; EAX = Count of 3 FAT sectors
    44                              <1> 	; EDX = Cluster Offset (< 768)
    45 0000B897 66D1E2              <1> 	shl	dx, 1 ; Multiply by 2
    46 0000B89A 89D3                <1> 	mov	ebx, edx ; Byte Offset
    47 0000B89C 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    48 0000B8A2 66BA0300            <1> 	mov	dx, 3
    49 0000B8A6 F7E2                <1> 	mul	edx  
    50                              <1> 	; EAX = FAT Sector (<= 256)
    51                              <1> 	; EDX = 0
    52 0000B8A8 8A0E                <1> 	mov	cl, [esi+LD_Name]
    53 0000B8AA 803D[BE4A0100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    54 0000B8B1 0F86CC000000        <1>         jna     load_FAT_sectors0
    55 0000B8B7 3A0D[BF4A0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    56 0000B8BD 0F85C0000000        <1>         jne     load_FAT_sectors0
    57 0000B8C3 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
    58 0000B8C9 0F85BA000000        <1>         jne     load_FAT_sectors1
    59                              <1> 	;movzx	eax, word [ebx]
    60 0000B8CF 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 0000B8D2 6683F8F7            <1> 	cmp	ax, 0FFF7h
    70 0000B8D6 725A                <1> 	jb	short loc_pass_gnc_FAT16_eoc_check
    71                              <1> 	; ax >= FFF7h (cluster 0002h to FFF6h is valid, in use)
    72 0000B8D8 EB56                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
    73                              <1> 
    74                              <1> get_FAT12_next_cluster:
    75 0000B8DA BB00040000          <1> 	mov	ebx, 400h ;1024
    76 0000B8DF F7F3                <1> 	div	ebx
    77                              <1> 	; EAX = Count of 3 FAT sectors
    78                              <1> 	; EDX = Cluster Offset (< 1024)
    79 0000B8E1 6650                <1> 	push	ax
    80 0000B8E3 66B80300            <1> 	mov	ax, 3	
    81 0000B8E7 66F7E2              <1> 	mul	dx    	; Multiply by 3
    82 0000B8EA 66D1E8              <1> 	shr	ax, 1	; Divide by 2
    83 0000B8ED 6689C3              <1>         mov	bx, ax 	; Byte Offset
    84 0000B8F0 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    85 0000B8F6 6658                <1> 	pop	ax
    86 0000B8F8 66BA0300            <1> 	mov	dx, 3
    87 0000B8FC F7E2                <1> 	mul	edx 
    88                              <1> 	; EAX = FAT Sector (<= 12)
    89                              <1> 	; EDX = 0
    90 0000B8FE 8A0E                <1> 	mov	cl, [esi+LD_Name]
    91 0000B900 803D[BE4A0100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    92 0000B907 767A                <1> 	jna	short load_FAT_sectors0
    93 0000B909 3A0D[BF4A0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    94 0000B90F 7572                <1> 	jne	short load_FAT_sectors0
    95 0000B911 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
    96 0000B917 7570                <1> 	jne	short load_FAT_sectors1
    97 0000B919 A1[BA4A0100]        <1> 	mov	eax, [FAT_CurrentCluster]
    98 0000B91E 66D1E8              <1> 	shr	ax, 1
    99                              <1> 	;movzx	eax, word [ebx]
   100 0000B921 668B03              <1> 	mov	ax, [ebx]
   101 0000B924 7314                <1> 	jnc	short get_FAT12_nc_even
   102 0000B926 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 0000B92A 663DF70F            <1> 	cmp	ax, 0FF7h
   109 0000B92E 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 0000B930 31C0                <1> 	xor	eax, eax ; 0
   114                              <1> loc_pass_gnc_FAT16_eoc_check:
   115                              <1> loc_pass_gnc_FAT32_eoc_check:
   116 0000B932 8B0D[BA4A0100]      <1> 	mov	ecx, [FAT_CurrentCluster]
   117 0000B938 F5                  <1> 	cmc
   118 0000B939 C3                  <1> 	retn
   119                              <1> 
   120                              <1> get_FAT12_nc_even:
   121 0000B93A 80E40F              <1> 	and	ah, 0Fh
   122 0000B93D EBEB                <1> 	jmp	short loc_gnc_fat12_eoc_check
   123                              <1> 
   124                              <1> get_FAT32_next_cluster:
   125 0000B93F BB80010000          <1> 	mov	ebx, 180h ;384
   126 0000B944 F7F3                <1> 	div	ebx
   127                              <1> 	; EAX = Count of 3 FAT sectors
   128                              <1> 	; EDX = Cluster Offset (< 384)
   129 0000B946 66C1E202            <1> 	shl	dx, 2	; Multiply by 4
   130 0000B94A 89D3                <1> 	mov	ebx, edx ; Byte Offset
   131 0000B94C 81C3001C0900        <1> 	add	ebx, FAT_Buffer
   132 0000B952 66BA0300            <1> 	mov	dx, 3
   133 0000B956 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 0000B958 8A0E                <1> 	mov	cl, [esi+LD_Name]
   139 0000B95A 803D[BE4A0100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
   140 0000B961 7620                <1> 	jna	short load_FAT_sectors0
   141 0000B963 3A0D[BF4A0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
   142 0000B969 7518                <1> 	jne	short load_FAT_sectors0
   143 0000B96B 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector] ; 0, 3, 6, 9 ...
   144 0000B971 7516                <1> 	jne	short load_FAT_sectors1
   145 0000B973 8B03                <1> 	mov	eax, [ebx]
   146 0000B975 25FFFFFF0F          <1>  	and	eax, 0FFFFFFFh ; 28 bit Cluster
   147 0000B97A 3DF7FFFF0F          <1> 	cmp	eax, 0FFFFFF7h
   148 0000B97F 72B1                <1> 	jb	short loc_pass_gnc_FAT32_eoc_check
   149                              <1> 	; eax >= FFFFFF7h (cluster 0002h to FFFFFF6h is valid)
   150 0000B981 EBAD                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
   151                              <1> 
   152                              <1> load_FAT_sectors0:
   153 0000B983 880D[BF4A0100]      <1> 	mov	[FAT_BuffDrvName], cl
   154                              <1> load_FAT_sectors1:
   155 0000B989 A3[C24A0100]        <1> 	mov	[FAT_BuffSector], eax
   156 0000B98E 89C3                <1> 	mov	ebx, eax
   157 0000B990 034660              <1>         add     eax, [esi+LD_FATBegin]
   158 0000B993 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   159 0000B997 7706                <1>         ja      short load_FAT_sectors3
   160 0000B999 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
   161 0000B99D EB03                <1> 	jmp	short load_FAT_sectors4
   162                              <1> load_FAT_sectors3:
   163 0000B99F 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+BPB_FATSz32]
   164                              <1> load_FAT_sectors4:
   165 0000B9A2 29D9                <1> 	sub	ecx, ebx ; [FAT_BuffSector]
   166 0000B9A4 83F903              <1>         cmp     ecx, 3
   167 0000B9A7 7605                <1>         jna     short load_FAT_sectors5
   168 0000B9A9 B903000000          <1> 	mov	ecx, 3
   169                              <1> load_FAT_sectors5:
   170 0000B9AE BB001C0900          <1> 	mov	ebx, FAT_Buffer
   171 0000B9B3 E831370000          <1> 	call	disk_read
   172 0000B9B8 730D                <1> 	jnc	short load_FAT_sectors_ok
   173                              <1> 	; 15/10/2016 (15h -> 17)
   174                              <1> 	; 23/03/2016 (15h)
   175 0000B9BA B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   176 0000B9BF C605[BE4A0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   177 0000B9C6 C3                  <1> 	retn
   178                              <1> load_FAT_sectors_ok:
   179 0000B9C7 C605[BE4A0100]01    <1> 	mov	byte [FAT_BuffValidData], 1
   180 0000B9CE A1[BA4A0100]        <1> 	mov	eax, [FAT_CurrentCluster]
   181 0000B9D3 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 0000B9D8 8A1E                <1> 	mov	bl, [esi+LD_Name]
   208 0000B9DA 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   209                              <1> 
   210                              <1> 	;mov	[DirBuff_DRV], bl
   211                              <1> 	;mov	[DirBuff_FATType], bh
   212 0000B9DD 66891D[CE4A0100]    <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 0000B9E4 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 0000B9E8 6681FA0002          <1> 	cmp	dx, 512 ; Number of Root Dir Entries
   224 0000B9ED 7414                <1> 	je	short lrd_mov_ecx_32
   225 0000B9EF 89D0                <1> 	mov	eax, edx
   226                              <1> 	; 23/10/2016
   227 0000B9F1 89C1                <1> 	mov	ecx, eax
   228 0000B9F3 6683C10F            <1> 	add	cx, 15 ; round up 
   229 0000B9F7 66C1E904            <1> 	shr	cx, 4  ; 16 entries per sector (512/32)
   230                              <1> 	; ecx = Root directory size in sectors
   231 0000B9FB 66C1E005            <1> 	shl	ax, 5 ; Root directory size in bytes
   232 0000B9FF 664A                <1> 	dec	dx    ; Last entry number of root dir
   233                              <1> 	; cx = Dir Buffer sector count             
   234 0000BA01 EB0B                <1> 	jmp	short lrd_check_dir_buffer
   235                              <1> 
   236                              <1> lrd_mov_ecx_32:
   237 0000BA03 B920000000          <1> 	mov	ecx, 32
   238 0000BA08 664A                <1> 	dec	dx ; 511
   239 0000BA0A 66B80040            <1> 	mov	ax, 32*512 
   240                              <1>  
   241                              <1> lrd_check_dir_buffer:
   242 0000BA0E 29DB                <1> 	sub	ebx, ebx ; 0
   243 0000BA10 881D[D04A0100]      <1> 	mov	[DirBuff_ValidData], bl ; 0
   244 0000BA16 668915[D34A0100]    <1> 	mov	[DirBuff_LastEntry], dx
   245 0000BA1D 891D[D54A0100]      <1> 	mov	[DirBuff_Cluster], ebx ; 0
   246 0000BA23 66A3[D94A0100]      <1> 	mov	[DirBuffer_Size], ax
   247                              <1> 
   248 0000BA29 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin]
   249                              <1> read_directory:
   250 0000BA2C BB00000800          <1> 	mov	ebx, Directory_Buffer
   251 0000BA31 51                  <1> 	push	ecx ; Directory buffer sector count
   252 0000BA32 53                  <1> 	push	ebx
   253 0000BA33 E8B1360000          <1> 	call	disk_read
   254 0000BA38 5B                  <1> 	pop	ebx
   255 0000BA39 720B                <1> 	jc	short load_DirBuff_error
   256                              <1> 
   257                              <1> validate_DirBuff_and_return:
   258 0000BA3B 59                  <1> 	pop	ecx ; Number of loaded sectors
   259 0000BA3C C605[D04A0100]01    <1> 	mov	byte [DirBuff_ValidData], 1
   260 0000BA43 31C0                <1> 	xor	eax, eax ; 0 = no error
   261 0000BA45 C3                  <1> 	retn
   262                              <1> 
   263                              <1> load_DirBuff_error:
   264 0000BA46 89C8                <1> 	mov	eax, ecx ; remaining sectors
   265 0000BA48 59                  <1> 	pop	ecx ; sector count
   266 0000BA49 29C1                <1> 	sub	ecx, eax ; Number of loaded sectors
   267                              <1> 	; 15/10/2016 (15h -> 17)
   268 0000BA4B B811000000          <1> 	mov	eax, 17 ; DRV NOT READY OR READ ERROR !
   269 0000BA50 F9                  <1> 	stc
   270 0000BA51 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 0000BA52 8A1E                <1> 	mov	bl, [esi+LD_Name]
   289 0000BA54 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   290                              <1> 
   291                              <1> 	;mov	[DirBuff_DRV], bl
   292                              <1> 	;mov	[DirBuff_FATType], bh
   293 0000BA57 66891D[CE4A0100]    <1> 	mov	[DirBuff_DRV], bx
   294                              <1> 
   295                              <1> load_FAT32_root_dir0:
   296 0000BA5E 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   297 0000BA61 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 0000BA63 8A1E                <1> 	mov	bl, [esi+LD_Name]
   319 0000BA65 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   320                              <1> 
   321                              <1> 	;mov	[DirBuff_DRV], bl
   322                              <1> 	;mov	[DirBuff_FATType], bh
   323 0000BA68 66891D[CE4A0100]    <1> 	mov	[DirBuff_DRV], bx
   324                              <1> 
   325                              <1> load_FAT_sub_dir0:
   326 0000BA6F 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
   327                              <1> 
   328 0000BA73 882D[D04A0100]      <1> 	mov	[DirBuff_ValidData], ch ; 0
   329 0000BA79 A3[D54A0100]        <1> 	mov	[DirBuff_Cluster], eax
   330                              <1> 
   331 0000BA7E 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
   332 0000BA82 F7E1                <1> 	mul	ecx
   333 0000BA84 C1E805              <1> 	shr	eax, 5 ; directory entry count (dir size / 32)
   334 0000BA87 6648                <1> 	dec	ax ; last entry
   335 0000BA89 66A3[D34A0100]      <1> 	mov	[DirBuff_LastEntry], ax
   336                              <1> 
   337 0000BA8F A1[D54A0100]        <1> 	mov	eax, [DirBuff_Cluster]
   338 0000BA94 83E802              <1> 	sub	eax, 2
   339 0000BA97 F7E1                <1> 	mul	ecx
   340 0000BA99 034668              <1> 	add	eax, [esi+LD_DATABegin]
   341                              <1> 	; ecx = sector per cluster (dir buffer size = 32 sectors)
   342 0000BA9C EB8E                <1> 	jmp	short read_directory
   343                              <1> 
   344                              <1> ; DRV_FS.ASM
   345                              <1> 
   346                              <1> load_current_FS_directory:
   347 0000BA9E C3                  <1> 	retn
   348                              <1> load_FS_root_directory:
   349 0000BA9F C3                  <1> 	retn
   350                              <1> load_FS_sub_directory:
   351 0000BAA0 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 0000BAA1 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 0000BAA5 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
   378 0000BAA9 761C                <1> 	jna	short read_fs_cluster
   379                              <1> 
   380                              <1> read_fat_file_sectors: ; 18/03/2016
   381 0000BAAB 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
   382 0000BAAE 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
   383 0000BAB2 F7E2                <1> 	mul	edx
   384 0000BAB4 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 0000BAB7 E82D360000          <1> 	call	disk_read
   393 0000BABC 7306                <1> 	jnc	short rclust_retn
   394                              <1> 	
   395                              <1> 	; 15/10/2016 (15h -> 17)
   396 0000BABE B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
   397 0000BAC3 C3                  <1> 	retn
   398                              <1> 
   399                              <1> rclust_retn:
   400 0000BAC4 29C0                <1> 	sub	eax, eax ; 0
   401 0000BAC6 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 0000BAC7 B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
   416 0000BACC E801000000          <1> 	call	read_fs_sectors
   417 0000BAD1 C3                  <1> 	retn
   418                              <1> 
   419                              <1> read_fs_sectors:
   420                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   421 0000BAD2 F9                  <1> 	stc
   422 0000BAD3 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 0000BAD4 8B4678              <1> 	mov	eax, [esi+LD_Clusters]
   440 0000BAD7 40                  <1> 	inc	eax ; add eax, 1
   441 0000BAD8 A3[584D0100]        <1> 	mov	[gffc_last_free_cluster], eax
   442                              <1> 
   443 0000BADD 31DB                <1> 	xor	ebx, ebx ; 0 ; 02/03/2016
   444                              <1> 
   445 0000BADF 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   446 0000BAE3 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 0000BAE5 E844060000          <1> 	call	get_fat32_fsinfo_sector_parms
   451 0000BAEA 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 0000BAEC 89D0                <1> 	mov	eax, edx ; FSI_Next_Free (First Free Cluster)
   463 0000BAEE 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh ; invalid (unknown) !
   464 0000BAF1 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 0000BAF3 B802000000          <1> 	mov	eax, 2
   469                              <1> 	;xor	edx, edx
   470                              <1> 
   471                              <1> loc_gffc_get_first_fat_free_cluster1:
   472 0000BAF8 53                  <1> 	push	ebx ; 02/03/2016 
   473                              <1> 
   474                              <1> loc_gffc_get_first_fat_free_cluster2:   
   475 0000BAF9 A3[544D0100]        <1> 	mov	[gffc_first_free_cluster], eax
   476 0000BAFE A3[504D0100]        <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 0000BB03 E875FDFFFF          <1> 	call	get_next_cluster
   484 0000BB08 7307                <1> 	jnc	short loc_gffc_get_first_fat_free_cluster4
   485 0000BB0A 09C0                <1> 	or	eax, eax
   486 0000BB0C 740B                <1> 	jz	short loc_gffc_first_free_fat_cluster_next
   487 0000BB0E 5B                  <1> 	pop	ebx ; 02/03/2016
   488 0000BB0F F5                  <1> 	cmc 	; stc
   489 0000BB10 C3                  <1> 	retn
   490                              <1> 
   491                              <1> loc_gffc_get_first_fat_free_cluster4:
   492 0000BB11 21C0                <1> 	and	eax, eax ; next cluster value
   493 0000BB13 7504                <1> 	jnz	short loc_gffc_first_free_fat_cluster_next
   494 0000BB15 89C8                <1> 	mov	eax, ecx ; current (previous cluster) value
   495 0000BB17 EB22                <1> 	jmp	short loc_gffc_check_for_set
   496                              <1>  
   497                              <1> loc_gffc_first_free_fat_cluster_next:
   498 0000BB19 A1[504D0100]        <1> 	mov	eax, [gffc_next_free_cluster]
   499 0000BB1E 3B05[584D0100]      <1> 	cmp	eax, [gffc_last_free_cluster]
   500 0000BB24 7308                <1> 	jnb	short retn_stc_from_get_first_free_cluster
   501                              <1> pass_gffc_last_cluster_eax_check:
   502 0000BB26 40                  <1> 	inc	eax ; add eax, 1
   503 0000BB27 A3[504D0100]        <1> 	mov	[gffc_next_free_cluster], eax
   504 0000BB2C EBD5                <1> 	jmp	short loc_gffc_get_first_fat_free_cluster3
   505                              <1> 
   506                              <1> retn_stc_from_get_first_free_cluster:
   507 0000BB2E A1[544D0100]        <1> 	mov	eax, [gffc_first_free_cluster]
   508 0000BB33 83F802              <1> 	cmp	eax, 2
   509 0000BB36 7709                <1> 	ja	short loc_gffc_check_previous_clusters
   510 0000BB38 29C0                <1> 	sub	eax, eax
   511 0000BB3A 48                  <1> 	dec	eax ; FFFFFFFFh
   512                              <1> 
   513                              <1> loc_gffc_check_for_set:
   514                              <1> 	; 02/03/2016
   515 0000BB3B 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 0000BB3C 09DB                <1> 	or	ebx, ebx
   522 0000BB3E 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 0000BB40 C3                  <1> 	retn
   531                              <1> 
   532                              <1> loc_gffc_check_previous_clusters:
   533 0000BB41 48                  <1> 	dec	eax ; sub eax, 1
   534 0000BB42 A3[584D0100]        <1> 	mov	[gffc_last_free_cluster], eax 
   535 0000BB47 B802000000          <1> 	mov	eax, 2
   536                              <1> 	;xor	edx, edx
   537 0000BB4C 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 0000BB4E 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 0000BB51 813B52526141        <1> 	cmp     dword [ebx], 41615252h
   576 0000BB57 7540                <1> 	jne	short loc_sffc_read_fsinfo_sector
   577 0000BB59 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
   577 0000BB62 61                  <1>
   578 0000BB63 7534                <1> 	jne	short loc_sffc_read_fsinfo_sector
   579                              <1> 
   580 0000BB65 3B83EC010000        <1> 	cmp	eax, [ebx+492]  ; FSI_Next_Free
   581 0000BB6B 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 0000BB6D 8983EC010000        <1> 	mov	[ebx+492], eax
   587 0000BB73 A1[684D0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC] 
   588 0000BB78 B901000000          <1> 	mov	ecx, 1
   589 0000BB7D 53                  <1> 	push	ebx
   590 0000BB7E E857350000          <1> 	call	disk_write
   591 0000BB83 7208                <1> 	jc      short loc_sffc_read_fsinfo_sector_err1
   592 0000BB85 5B                  <1> 	pop	ebx
   593                              <1> 
   594 0000BB86 8B83EC010000        <1> 	mov	eax, [ebx+492] ; First (Next) Free Cluster
   595                              <1> 
   596                              <1> loc_sffc_retn:
   597 0000BB8C 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 0000BB8D BB00000000          <1> 	mov	ebx, 0
   605                              <1> 	; 15/10/2016 (1Dh -> 18)
   606                              <1> 	; 23/03/2016 (1Dh)
   607 0000BB92 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
   608                              <1> 
   609                              <1> loc_sffc_read_fsinfo_sector_err2:
   610 0000BB97 5A                  <1> 	pop	edx
   611 0000BB98 C3                  <1> 	retn
   612                              <1> 	
   613                              <1> loc_sffc_read_fsinfo_sector:
   614 0000BB99 50                  <1> 	push	eax
   615                              <1> 
   616 0000BB9A E88F050000          <1> 	call	get_fat32_fsinfo_sector_parms
   617 0000BB9F 72F6                <1> 	jc	short loc_sffc_read_fsinfo_sector_err2
   618                              <1> 
   619 0000BBA1 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 0000BBA2 39D0                <1> 	cmp	eax, edx ; First free Cluster (eax = new value) 
   624 0000BBA4 75C7                <1> 	jne	short loc_sffc_write_fsinfo_sector
   625                              <1> 
   626 0000BBA6 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 0000BBA7 A3[BA4A0100]        <1> 	mov	[FAT_CurrentCluster], eax
   662 0000BBAC 890D[5C4D0100]      <1> 	mov	[ClusterValue], ecx
   663                              <1> 
   664                              <1> loc_update_cluster_check_fat_buffer:
   665 0000BBB2 8A1E                <1> 	mov	bl, [esi+LD_Name]
   666 0000BBB4 381D[BF4A0100]      <1> 	cmp	[FAT_BuffDrvName], bl
   667 0000BBBA 741A                <1> 	je	short loc_update_cluster_check_fat_type
   668 0000BBBC 803D[BE4A0100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
   669 0000BBC3 0F84C2000000        <1>         je      loc_uc_save_fat_buffer
   670                              <1> 
   671                              <1> loc_uc_reset_fat_buffer_validation:
   672 0000BBC9 C605[BE4A0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   673                              <1> 
   674                              <1> loc_uc_check_fat_type_reset_drvname:
   675 0000BBD0 881D[BF4A0100]      <1> 	mov	[FAT_BuffDrvName], bl
   676                              <1> 
   677                              <1> loc_update_cluster_check_fat_type:
   678 0000BBD6 29D2                <1> 	sub	edx, edx ; 26/02/2016
   679 0000BBD8 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
   680 0000BBDB 83F802              <1> 	cmp	eax, 2
   681 0000BBDE 0F82BE000000        <1>         jb      update_cluster_inv_data
   682 0000BBE4 80FB02              <1> 	cmp	bl, 2 
   683 0000BBE7 0F877A010000        <1>         ja      update_fat32_cluster
   684                              <1> 	;cmp	bl, 1
   685                              <1> 	;jb	short update_cluster_inv_data
   686 0000BBED 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   687 0000BBF0 41                  <1> 	inc	ecx  
   688 0000BBF1 890D[CA4A0100]      <1> 	mov	[LastCluster], ecx
   689 0000BBF7 39C8                <1> 	cmp	eax, ecx ; dword [LastCluster]
   690 0000BBF9 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 0000BBFF 80FB01              <1> 	cmp	bl, 1 ; correct comparison is this !
   699 0000BC02 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 0000BC08 BB00030000          <1> 	mov	ebx, 300h ;768
   705 0000BC0D F7F3                <1> 	div	ebx
   706                              <1> 	; EAX = Count of 3 FAT sectors
   707                              <1> 	; DX = Cluster offset in FAT buffer
   708 0000BC0F 6689D3              <1> 	mov	bx, dx  
   709 0000BC12 66D1E3              <1> 	shl	bx, 1 ; Multiply by 2
   710 0000BC15 66BA0300            <1> 	mov	dx, 3
   711 0000BC19 F7E2                <1> 	mul	edx  
   712                              <1> 	; EAX = FAT Sector
   713                              <1> 	; EDX = 0
   714                              <1> 	; EBX = Byte offset in FAT buffer
   715 0000BC1B 8A0D[BE4A0100]      <1> 	mov	cl, [FAT_BuffValidData]
   716 0000BC21 80F902              <1> 	cmp	cl, 2
   717 0000BC24 750A                <1> 	jne	short loc_uc_check_fat16_buff_sector_load
   718                              <1> 
   719                              <1> loc_uc_check_fat16_buff_sector_save:
   720 0000BC26 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
   721 0000BC2C 755D                <1> 	jne	short loc_uc_save_fat_buffer
   722 0000BC2E EB15                <1> 	jmp	short loc_update_fat16_cell
   723                              <1> 
   724                              <1> loc_uc_check_fat16_buff_sector_load:
   725 0000BC30 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   726 0000BC33 0F85FB010000        <1>         jne     loc_uc_load_fat_sectors
   727 0000BC39 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
   728 0000BC3F 0F85EF010000        <1>         jne     loc_uc_load_fat_sectors
   729                              <1> 
   730                              <1> loc_update_fat16_cell:
   731                              <1> loc_update_fat16_buffer:
   732 0000BC45 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   733                              <1> 	;movzx	eax, word [ebx]
   734 0000BC4B 668B03              <1> 	mov	ax, [ebx]
   735                              <1> 	; 01/03/2016
   736 0000BC4E 89C2                <1> 	mov	edx, eax ; old value of the cluster
   737 0000BC50 A3[BA4A0100]        <1> 	mov	[FAT_CurrentCluster], eax
   738 0000BC55 8B0D[5C4D0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   739 0000BC5B 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   740                              <1> 
   741 0000BC5E C605[BE4A0100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   742                              <1> 	
   743 0000BC65 6683F802            <1> 	cmp	ax, 2
   744 0000BC69 723A                <1> 	jb	short return_uc_fat_stc
   745 0000BC6B 3B05[CA4A0100]      <1> 	cmp	eax, [LastCluster]
   746 0000BC71 7732                <1> 	ja	short return_uc_fat_stc
   747                              <1> 
   748                              <1> loc_fat_buffer_updated:
   749                              <1> 	; 01/03/2016
   750 0000BC73 F8                  <1> 	clc
   751                              <1> loc_fat_buffer_stc_1:
   752 0000BC74 9C                  <1> 	pushf
   753 0000BC75 21C9                <1> 	and	ecx, ecx
   754 0000BC77 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 0000BC79 FF05[C64A0100]      <1> 	inc	dword [FAT_ClusterCounter]
   760                              <1> 
   761                              <1> loc_fat_buffer_updated_1: ; new value of the cluster > 0
   762 0000BC7F 09D2                <1> 	or	edx, edx ; 02/03/2016
   763 0000BC81 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 0000BC83 FF0D[C64A0100]      <1> 	dec	dword [FAT_ClusterCounter] ; it may be negative number
   767                              <1> 
   768                              <1> loc_fat_buffer_updated_2:
   769 0000BC89 9D                  <1> 	popf
   770 0000BC8A C3                  <1> 	retn
   771                              <1> 
   772                              <1> loc_uc_save_fat_buffer:
   773                              <1> 	; byte [FAT_BuffValidData] = 2 
   774 0000BC8B E8D4010000          <1> 	call	save_fat_buffer
   775 0000BC90 0F8297010000        <1>         jc      loc_fat_sectors_rw_error2
   776                              <1> 	;mov	byte [FAT_BuffValidData], 1
   777 0000BC96 A1[BA4A0100]        <1> 	mov	eax, [FAT_CurrentCluster]
   778                              <1> 	;mov	ecx, [ClusterValue]
   779                              <1> 	;jmp	short loc_update_cluster_check_fat_buffer
   780 0000BC9B 8A1E                <1> 	mov	bl, [esi+LD_Name] ; 01/03/2016
   781 0000BC9D E927FFFFFF          <1>         jmp     loc_uc_reset_fat_buffer_validation
   782                              <1> 
   783                              <1> update_cluster_inv_data:
   784                              <1> 	;mov	eax, 0Dh
   785 0000BCA2 B00D                <1> 	mov	al, 0Dh  ; Invalid Data
   786 0000BCA4 C3                  <1> 	retn 
   787                              <1> 
   788                              <1> return_uc_fat_stc:
   789                              <1> 	; 01/03/2016
   790 0000BCA5 31C0                <1> 	xor	eax, eax
   791 0000BCA7 F9                  <1> 	stc
   792 0000BCA8 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 0000BCAA BB00040000          <1> 	mov	ebx, 400h ;1024
   798 0000BCAF F7F3                <1> 	div	ebx
   799                              <1> 	; EAX = Count of 3 FAT sectors
   800                              <1> 	; DX = Cluster offset in FAT buffer
   801 0000BCB1 66B90300            <1> 	mov	cx, 3
   802 0000BCB5 6689C3              <1> 	mov	bx, ax
   803 0000BCB8 6689C8              <1> 	mov	ax, cx ; 3
   804 0000BCBB 66F7E2              <1> 	mul	dx     ; Multiply by 3
   805 0000BCBE 66D1E8              <1> 	shr	ax, 1  ; Divide by 2
   806 0000BCC1 6693                <1> 	xchg	bx, ax
   807                              <1> 	; EAX = Count of 3 FAT sectors
   808                              <1> 	; EBX = Byte Offset in FAT buffer   
   809 0000BCC3 66F7E1              <1> 	mul	cx  ; 3 * AX
   810                              <1> 	; EAX = FAT Beginning Sector
   811                              <1> 	; EDX = 0
   812 0000BCC6 8A0D[BE4A0100]      <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 0000BCCC 80F902              <1> 	cmp	cl, 2 ; 2 = dirty buffer (must be written to disk)
   817 0000BCCF 750A                <1> 	jne	short loc_uc_check_fat12_buff_sector_load
   818                              <1> 
   819                              <1> loc_uc_check_fat12_buff_sector_save:
   820 0000BCD1 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
   821 0000BCD7 75B2                <1>         jne     short loc_uc_save_fat_buffer
   822 0000BCD9 EB15                <1> 	jmp	short loc_update_fat12_cell
   823                              <1> 
   824                              <1> loc_uc_check_fat12_buff_sector_load:
   825 0000BCDB 80F901              <1> 	cmp	cl, 1 ; byte ptr [FAT_BuffValidData]
   826 0000BCDE 0F8550010000        <1>         jne     loc_uc_load_fat_sectors
   827 0000BCE4 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
   828 0000BCEA 0F8544010000        <1>         jne     loc_uc_load_fat_sectors
   829                              <1> 
   830                              <1> loc_update_fat12_cell:
   831 0000BCF0 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   832 0000BCF6 668B0D[BA4A0100]    <1> 	mov	cx, [FAT_CurrentCluster]
   833 0000BCFD 66D1E9              <1> 	shr	cx, 1
   834 0000BD00 668B03              <1> 	mov	ax, [ebx]
   835 0000BD03 6689C2              <1> 	mov	dx, ax
   836 0000BD06 7344                <1> 	jnc	short uc_fat12_nc_even
   837                              <1> 
   838 0000BD08 6683E00F            <1> 	and	ax, 0Fh
   839 0000BD0C 8B0D[5C4D0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   840 0000BD12 66C1E104            <1> 	shl	cx, 4
   841 0000BD16 6609C1              <1> 	or	cx, ax
   842 0000BD19 6689D0              <1> 	mov	ax, dx
   843 0000BD1C 66890B              <1> 	mov	[ebx], cx  ; 16 bits !
   844 0000BD1F 66C1E804            <1> 	shr	ax, 4 ; al(bit4..7)+ah(bit0..7)
   845                              <1> 
   846                              <1> update_fat12_buffer:
   847 0000BD23 A3[BA4A0100]        <1> 	mov	[FAT_CurrentCluster], eax
   848 0000BD28 89C2                <1> 	mov	edx, eax ; 01/03/2016
   849 0000BD2A C605[BE4A0100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   850 0000BD31 6683F802            <1> 	cmp	ax, 2
   851 0000BD35 0F826AFFFFFF        <1>         jb      return_uc_fat_stc
   852 0000BD3B 3B05[CA4A0100]      <1> 	cmp	eax, [LastCluster]
   853 0000BD41 0F875EFFFFFF        <1>         ja      return_uc_fat_stc
   854 0000BD47 E927FFFFFF          <1>         jmp     loc_fat_buffer_updated
   855                              <1> 
   856                              <1> uc_fat12_nc_even:
   857 0000BD4C 662500F0            <1> 	and	ax, 0F000h
   858 0000BD50 8B0D[5C4D0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   859 0000BD56 80E50F              <1> 	and	ch, 0Fh
   860 0000BD59 6609C1              <1> 	or	cx, ax
   861 0000BD5C 6689D0              <1> 	mov	ax, dx
   862 0000BD5F 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   863 0000BD62 80E40F              <1> 	and	ah, 0Fh ; al(bit0..7)+ah(bit0..3)
   864 0000BD65 EBBC                <1> 	jmp	short update_fat12_buffer
   865                              <1> 
   866                              <1> update_fat32_cluster:
   867 0000BD67 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   868 0000BD6A 41                  <1> 	inc	ecx
   869 0000BD6B 890D[CA4A0100]      <1> 	mov	[LastCluster], ecx
   870                              <1> 
   871 0000BD71 39C8                <1> 	cmp	eax, ecx
   872 0000BD73 0F872CFFFFFF        <1>         ja      return_uc_fat_stc
   873                              <1> 
   874                              <1> pass_uc_fat32_errc:
   875                              <1> 	;sub	edx, edx
   876 0000BD79 BB80010000          <1> 	mov	ebx, 180h ;384
   877 0000BD7E F7F3                <1> 	div	ebx
   878                              <1> 	; EAX = Count of 3 FAT sectors
   879                              <1> 	; DX = Cluster offset in FAT buffer
   880 0000BD80 89D3                <1> 	mov	ebx, edx
   881 0000BD82 C1E302              <1> 	shl	ebx, 2 ; Multiply by 4
   882 0000BD85 BA03000000          <1> 	mov	edx, 3	
   883 0000BD8A F7E2                <1> 	mul	edx
   884                              <1> 	; EBX = Cluster Offset in FAT buffer
   885                              <1> 	; EAX = FAT Sector
   886                              <1> 	; EDX = 0
   887 0000BD8C 8A0D[BE4A0100]      <1> 	mov	cl, [FAT_BuffValidData]
   888 0000BD92 80F902              <1> 	cmp	cl, 2
   889 0000BD95 750E                <1> 	jne	short loc_uc_check_fat32_buff_sector_load
   890                              <1> 
   891                              <1> loc_uc_check_fat32_buff_sector_save:
   892 0000BD97 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
   893 0000BD9D 0F85E8FEFFFF        <1>         jne     loc_uc_save_fat_buffer
   894 0000BDA3 EB11                <1> 	jmp	short loc_update_fat32_cell
   895                              <1> 
   896                              <1> loc_uc_check_fat32_buff_sector_load:
   897 0000BDA5 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   898 0000BDA8 0F8586000000        <1>         jne     loc_uc_load_fat_sectors
   899 0000BDAE 3B05[C24A0100]      <1> 	cmp	eax, [FAT_BuffSector]
   900 0000BDB4 757E                <1>         jne     loc_uc_load_fat_sectors
   901                              <1> 
   902                              <1> loc_update_fat32_cell:
   903                              <1> loc_update_fat32_buffer:
   904 0000BDB6 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   905 0000BDBC 8B03                <1> 	mov	eax, [ebx]
   906 0000BDBE 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh ; 28 bit cluster value
   907                              <1> 	
   908 0000BDC3 8B15[BA4A0100]      <1> 	mov	edx, [FAT_CurrentCluster] ; 01/03/2016
   909                              <1> 
   910 0000BDC9 A3[BA4A0100]        <1> 	mov 	[FAT_CurrentCluster], eax
   911 0000BDCE 8B0D[5C4D0100]      <1> 	mov	ecx, [ClusterValue]
   912 0000BDD4 890B                <1> 	mov	[ebx], ecx ; 29/02/2016 
   913                              <1> 
   914 0000BDD6 C605[BE4A0100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   915                              <1> 
   916                              <1> 	; 01/03/2016
   917 0000BDDD 21C0                <1> 	and	eax, eax ; was it free cluster ?
   918 0000BDDF 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 0000BDE1 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   924 0000BDE4 7520                <1> 	jne	short loc_upd_fat32_c3
   925                              <1> 
   926 0000BDE6 3B15[CA4A0100]      <1> 	cmp	edx, [LastCluster]
   927 0000BDEC 7207                <1> 	jb	short loc_upd_fat32_c0
   928                              <1> 
   929 0000BDEE BA02000000          <1> 	mov	edx, 2 ; rewind !
   930 0000BDF3 EB0E                <1> 	jmp	short loc_upd_fat32_c2
   931                              <1> 
   932                              <1> loc_upd_fat32_c0:
   933 0000BDF5 FF463E              <1> 	inc	dword [esi+LD_BPB+BPB_Reserved+4] ; set it to next cluster		
   934 0000BDF8 EB0C                <1> 	jmp	short loc_upd_fat32_c3
   935                              <1> 
   936                              <1> loc_upd_fat32_c1:
   937 0000BDFA 09C9                <1> 	or	ecx, ecx ; will it be free cluster ?
   938 0000BDFC 7508                <1> 	jnz	short loc_upd_fat32_c3
   939                              <1> 
   940 0000BDFE 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   941 0000BE01 7303                <1> 	jnb	short loc_upd_fat32_c3
   942                              <1> 
   943                              <1> loc_upd_fat32_c2:	
   944 0000BE03 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx			
   945                              <1> 
   946                              <1> loc_upd_fat32_c3:
   947 0000BE06 89C2                <1> 	mov	edx, eax
   948                              <1> 
   949                              <1> loc_upd_fat32_c4:
   950 0000BE08 83F802              <1> 	cmp	eax, 2
   951 0000BE0B 0F8294FEFFFF        <1>         jb      return_uc_fat_stc
   952                              <1> 
   953                              <1> pass_uc_fat32_c_zero_check_2:
   954 0000BE11 3B05[CA4A0100]      <1> 	cmp	eax, [LastCluster]
   955 0000BE17 0F8788FEFFFF        <1>         ja      return_uc_fat_stc
   956                              <1> 	
   957 0000BE1D 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 0000BE22 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   964 0000BE27 8825[BE4A0100]      <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 0000BE2D 8B0D[5C4D0100]      <1> 	mov	ecx, [ClusterValue]
   970 0000BE33 C3                  <1> 	retn
   971                              <1> 
   972                              <1> loc_uc_load_fat_sectors:
   973 0000BE34 A3[C24A0100]        <1> 	mov	[FAT_BuffSector], eax
   974                              <1> 
   975                              <1> load_uc_fat_sectors_zero:
   976 0000BE39 034660              <1> 	add	eax, [esi+LD_FATBegin]
   977 0000BE3C BB001C0900          <1> 	mov	ebx, FAT_Buffer
   978 0000BE41 B903000000          <1> 	mov	ecx, 3
   979 0000BE46 E89E320000          <1> 	call	disk_read
   980 0000BE4B 72D5                <1> 	jc	short loc_fat_sectors_rw_error1
   981                              <1> 
   982 0000BE4D C605[BE4A0100]01    <1>         mov     byte [FAT_BuffValidData], 1
   983 0000BE54 A1[BA4A0100]        <1> 	mov 	eax, [FAT_CurrentCluster]
   984 0000BE59 8B0D[5C4D0100]      <1> 	mov	ecx, [ClusterValue]
   985 0000BE5F 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 0000BE64 31D2                <1> 	xor	edx, edx
  1012 0000BE66 8A35[BF4A0100]      <1> 	mov	dh, [FAT_BuffDrvName]
  1013 0000BE6C 80FE41              <1> 	cmp	dh, 'A'
  1014 0000BE6F 722E                <1> 	jb	short loc_save_fat_buffer_inv_data_retn
  1015 0000BE71 80EE41              <1> 	sub	dh, 'A'
  1016 0000BE74 56                  <1> 	push	esi ; *
  1017 0000BE75 BE00010900          <1>         mov     esi, Logical_DOSDisks
  1018 0000BE7A 01D6                <1> 	add	esi, edx
  1019                              <1> 	
  1020 0000BE7C 8A5603              <1> 	mov	dl, [esi+LD_FATType]
  1021 0000BE7F 20D2                <1> 	and	dl, dl
  1022 0000BE81 741B                <1> 	jz	short loc_save_fat_buffer_inv_data_pop_retn 
  1023                              <1> 
  1024 0000BE83 A1[C24A0100]        <1> 	mov	eax, [FAT_BuffSector]
  1025 0000BE88 80FA02              <1> 	cmp	dl, 2
  1026 0000BE8B 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 0000BE8D 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+FATSecs] 
  1035 0000BE91 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 0000BE93 7609                <1> 	jna	short loc_save_fat_buffer_inv_data_pop_retn ; correct addr.
  1039 0000BE95 EB15                <1> 	jmp	short loc_save_fat_buffer_check_rs3
  1040                              <1> 
  1041                              <1> loc_save_fat32_buff:
  1042 0000BE97 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+FAT32_FAT_Size]
  1043 0000BE9A 29C1                <1> 	sub	ecx, eax
  1044 0000BE9C 770E                <1> 	ja	short loc_save_fat_buffer_check_rs3
  1045                              <1> 
  1046                              <1> loc_save_fat_buffer_inv_data_pop_retn:
  1047 0000BE9E 5E                  <1> 	pop	esi ; *
  1048                              <1> loc_save_fat_buffer_inv_data_retn:
  1049 0000BE9F B80D000000          <1> 	mov	eax, 0Dh ; Invalid DATA
  1050 0000BEA4 C3                  <1> 	retn
  1051                              <1> 
  1052                              <1> loc_save_fat_buff_remain_sectors_3:
  1053 0000BEA5 B903000000          <1> 	mov	ecx, 3
  1054 0000BEAA EB05                <1> 	jmp	short loc_save_fat_buff_continue
  1055                              <1> 
  1056                              <1> loc_save_fat_buffer_check_rs3:
  1057 0000BEAC 83F903              <1> 	cmp	ecx, 3
  1058 0000BEAF 77F4                <1> 	ja	short loc_save_fat_buff_remain_sectors_3
  1059                              <1> 
  1060                              <1> loc_save_fat_buff_continue:
  1061 0000BEB1 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1062 0000BEB6 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1063 0000BEB9 51                  <1> 	push	ecx
  1064 0000BEBA E81B320000          <1> 	call	disk_write
  1065 0000BEBF 59                  <1> 	pop	ecx
  1066 0000BEC0 722B                <1> 	jc	short loc_save_FAT_buff_write_err
  1067                              <1> 	
  1068 0000BEC2 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1069 0000BEC6 7605                <1> 	jna	short loc_calc_2nd_fat12_16_addr
  1070                              <1> 
  1071                              <1> loc_calc_2nd_fat32_addr:
  1072 0000BEC8 8B462A              <1> 	mov	eax, [esi+LD_BPB+FAT32_FAT_Size]
  1073 0000BECB EB04                <1> 	jmp	short loc_calc_2nd_fat_addr
  1074                              <1> 
  1075                              <1> loc_calc_2nd_fat12_16_addr:
  1076 0000BECD 0FB7461C            <1> 	movzx	eax, word [esi+LD_BPB+FATSecs]
  1077                              <1> 
  1078                              <1> loc_calc_2nd_fat_addr:
  1079 0000BED1 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1080 0000BED4 0305[C24A0100]      <1> 	add	eax, [FAT_BuffSector]
  1081 0000BEDA BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1082                              <1> 	; ecx = 1 to 3
  1083 0000BEDF E8F6310000          <1> 	call	disk_write
  1084 0000BEE4 7207                <1> 	jc	short loc_save_FAT_buff_write_err
  1085                              <1>  	; Valid  buffer (1 = valid but do not save)
  1086 0000BEE6 C605[BE4A0100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1087                              <1> 
  1088                              <1> loc_save_FAT_buff_write_err:
  1089 0000BEED 5E                  <1> 	pop	esi ; *
  1090 0000BEEE BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1091                              <1> 	; 15/10/2016 (1Dh -> 18)
  1092                              <1> 	; 23/03/2016 (1Dh)
  1093 0000BEF3 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
  1094 0000BEF8 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 0000BEF9 66891D[624D0100]    <1> 	mov	[CFS_OPType], bx
  1122 0000BF00 A3[644D0100]        <1> 	mov	[CFS_CC], eax
  1123                              <1> 	
  1124 0000BF05 80FFFF              <1> 	cmp	bh, 0FFh
  1125 0000BF08 740B                <1> 	je	short pass_calculate_freespace_get_drive_dt_offset
  1126                              <1> 
  1127                              <1> loc_calculate_freespace_get_drive_dt_offset:     
  1128 0000BF0A 31C0                <1> 	xor	eax, eax
  1129 0000BF0C 88FC                <1>         mov     ah, bh
  1130 0000BF0E BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1131 0000BF13 01C6                <1>         add     esi, eax
  1132                              <1> 
  1133                              <1> pass_calculate_freespace_get_drive_dt_offset:
  1134 0000BF15 08DB                <1> 	or	bl, bl
  1135 0000BF17 7435                <1> 	jz	short loc_reset_fcc
  1136                              <1> 	
  1137                              <1> loc_get_free_sectors:
  1138 0000BF19 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 0000BF1C 8B4E70              <1> 	mov	ecx, [esi+LD_TotalSectors]
  1147 0000BF1F 39C1                <1> 	cmp	ecx, eax ; Total sectors must be greater than Free sectors !
  1148 0000BF21 7707                <1> 	ja	short loc_get_free_sectors_check_optype
  1149                              <1> 	
  1150 0000BF23 31C0                <1> 	xor	eax, eax
  1151 0000BF25 48                  <1> 	dec	eax ; 0FFFFFFFFh  ; recalculation is needed!
  1152 0000BF26 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; reset (for recalculation)
  1153                              <1> 		
  1154                              <1> loc_get_free_sectors_retn:
  1155 0000BF29 C3                  <1> 	retn
  1156                              <1> 	
  1157                              <1> loc_get_free_sectors_check_optype:
  1158 0000BF2A 80FB03              <1> 	cmp	bl, 3
  1159 0000BF2D 7203                <1> 	jb	short loc_set_fcc
  1160                              <1> 
  1161 0000BF2F 29C9                <1> 	sub	ecx, ecx ; 0
  1162                              <1> 
  1163 0000BF31 C3                  <1> 	retn	
  1164                              <1> 
  1165                              <1> loc_set_fcc:
  1166 0000BF32 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1167 0000BF36 0F87DF000000        <1>         ja      loc_update_FAT32_fs_info_fcc
  1168                              <1> 
  1169                              <1> 	;mov	eax, [esi+LD_FreeSectors]
  1170 0000BF3C 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  1171 0000BF40 29D2                <1> 	sub	edx, edx
  1172 0000BF42 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 0000BF44 A3[DB4A0100]        <1> 	mov	[FreeClusterCount], eax
  1180 0000BF49 E988000000          <1>         jmp     loc_set_free_sectors_FAT12_FAT16
  1181                              <1> 
  1182                              <1> loc_reset_fcc:
  1183 0000BF4E 31C0                <1> 	xor	eax, eax
  1184 0000BF50 A3[DB4A0100]        <1> 	mov	[FreeClusterCount], eax ; 0
  1185 0000BF55 8B5678              <1> 	mov	edx, [esi+LD_Clusters]
  1186 0000BF58 42                  <1> 	inc	edx
  1187 0000BF59 8915[CA4A0100]      <1> 	mov	[LastCluster], edx
  1188                              <1> 
  1189 0000BF5F 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1190 0000BF63 7647                <1> 	jna	short loc_count_free_fat_clusters_0  
  1191                              <1> 
  1192 0000BF65 48                  <1> 	dec	eax ; FFFFFFFFh
  1193 0000BF66 A3[6C4D0100]        <1> 	mov	[CFS_FAT32FC], eax
  1194                              <1> 
  1195                              <1> 	; 29/02/2016
  1196 0000BF6B 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; reset
  1197 0000BF6E 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; reset
  1198                              <1> 	
  1199 0000BF71 B802000000          <1> 	mov 	eax, 2
  1200                              <1> 
  1201                              <1> loc_count_fc_next_cluster_0:
  1202 0000BF76 50                  <1> 	push	eax
  1203 0000BF77 E801F9FFFF          <1> 	call	get_next_cluster
  1204 0000BF7C 7310                <1> 	jnc	short loc_check_fat32_ff_cluster
  1205 0000BF7E 09C0                <1> 	or	eax, eax
  1206 0000BF80 741E                <1> 	jz	short pass_inc_cfs_fcc_0
  1207                              <1> 
  1208                              <1> loc_put_fcc_unknown_sign:
  1209 0000BF82 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 0000BF83 8B15[6C4D0100]      <1> 	mov	edx, [CFS_FAT32FC] ; First Free Cluster
  1217                              <1> 	; Save First Free Cluster value in FAT32 'BPB_Reserved+4' area
  1218 0000BF89 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx
  1219                              <1> 	
  1220 0000BF8C EB7D                <1>         jmp     loc_put_fcc_invalid_sign
  1221                              <1> 
  1222                              <1> loc_check_fat32_ff_cluster:
  1223 0000BF8E 09C0                <1> 	or	eax, eax
  1224 0000BF90 750E                <1> 	jnz	short pass_inc_cfs_fcc_0
  1225 0000BF92 58                  <1> 	pop	eax
  1226 0000BF93 A3[6C4D0100]        <1> 	mov	[CFS_FAT32FC], eax
  1227                              <1> 	;mov	dword [FreeClusterCount], 1
  1228 0000BF98 FF05[DB4A0100]      <1> 	inc	dword [FreeClusterCount]
  1229 0000BF9E EB27                <1> 	jmp	short pass_inc_cfs_fcc_1
  1230                              <1> 
  1231                              <1> pass_inc_cfs_fcc_0:
  1232 0000BFA0 58                  <1> 	pop	eax
  1233                              <1> 
  1234                              <1> pass_inc_cfs_fcc_0c:
  1235 0000BFA1 40                  <1> 	inc	eax ; add eax, 1
  1236 0000BFA2 3B05[CA4A0100]      <1> 	cmp	eax, [LastCluster]
  1237 0000BFA8 76CC                <1> 	jna 	short loc_count_fc_next_cluster_0
  1238 0000BFAA 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 0000BFAC B002                <1> 	mov	al, 2
  1243                              <1> 
  1244                              <1> loc_count_fc_next_cluster:
  1245 0000BFAE 50                  <1> 	push	eax
  1246 0000BFAF E8C9F8FFFF          <1> 	call	get_next_cluster
  1247 0000BFB4 720C                <1> 	jc	short loc_count_fcc_stc
  1248                              <1> 
  1249                              <1> loc_count_free_clusters_1:
  1250 0000BFB6 21C0                <1> 	and	eax, eax
  1251 0000BFB8 750C                <1> 	jnz	short pass_inc_cfs_fcc
  1252                              <1> 
  1253 0000BFBA FF05[DB4A0100]      <1> 	inc	dword [FreeClusterCount]
  1254 0000BFC0 EB04                <1> 	jmp	short pass_inc_cfs_fcc
  1255                              <1> 
  1256                              <1> loc_count_fcc_stc:
  1257 0000BFC2 09C0                <1> 	or	eax, eax
  1258 0000BFC4 75BC                <1> 	jnz	short loc_put_fcc_unknown_sign ; 29/02/2016
  1259                              <1> 
  1260                              <1> pass_inc_cfs_fcc:
  1261 0000BFC6 58                  <1> 	pop	eax
  1262                              <1> 
  1263                              <1> pass_inc_cfs_fcc_1:
  1264 0000BFC7 40                  <1> 	inc	eax ; add eax, 1
  1265 0000BFC8 3B05[CA4A0100]      <1> 	cmp	eax, [LastCluster]
  1266 0000BFCE 76DE                <1> 	jna	short loc_count_fc_next_cluster
  1267                              <1> 
  1268                              <1> loc_set_free_sectors:
  1269 0000BFD0 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1270 0000BFD4 7745                <1> 	ja	short loc_update_FAT32_fs_info_fcc
  1271                              <1> 
  1272                              <1> loc_set_free_sectors_FAT12_FAT16:
  1273 0000BFD6 803D[624D0100]00    <1> 	cmp	byte [CFS_OPType], 0
  1274 0000BFDD 761C                <1> 	jna	short pass_FAT_add_sub_fcc
  1275 0000BFDF A1[644D0100]        <1> 	mov	eax, [CFS_CC]
  1276 0000BFE4 803D[624D0100]01    <1> 	cmp	byte [CFS_OPType], 1
  1277 0000BFEB 7708                <1> 	ja	short pass_FAT_add_fcc
  1278 0000BFED 0105[DB4A0100]      <1> 	add 	[FreeClusterCount], eax
  1279 0000BFF3 EB06                <1> 	jmp	short pass_FAT_add_sub_fcc
  1280                              <1> 
  1281                              <1> pass_FAT_add_fcc:
  1282 0000BFF5 2905[DB4A0100]      <1> 	sub	[FreeClusterCount], eax
  1283                              <1> 
  1284                              <1> pass_FAT_add_sub_fcc:
  1285 0000BFFB 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1286 0000BFFF 8B15[DB4A0100]      <1> 	mov	edx, [FreeClusterCount]
  1287 0000C005 F7E2                <1> 	mul	edx
  1288                              <1> 
  1289 0000C007 31C9                <1> 	xor	ecx, ecx 
  1290 0000C009 EB05                <1> 	jmp	short loc_cfs_retn_params
  1291                              <1> 
  1292                              <1> loc_put_fcc_invalid_sign:
  1293 0000C00B 29C0                <1>        	sub	eax, eax ; 0
  1294 0000C00D 48                  <1> 	dec	eax ; FFFFFFFFh
  1295                              <1> loc_fat32_ffc_recalc_needed:
  1296 0000C00E 89C1                <1> 	mov	ecx, eax
  1297                              <1> 
  1298                              <1> loc_cfs_retn_params:
  1299 0000C010 894674              <1> 	mov 	[esi+LD_FreeSectors], eax
  1300 0000C013 0FB71D[624D0100]    <1> 	movzx	ebx, word [CFS_OPType]
  1301 0000C01A 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 0000C01B 803D[624D0100]01    <1> 	cmp	byte [CFS_OPType], 1
  1309 0000C022 7221                <1> 	jb	short loc_cfs_FAT32_get_rcalc_parms ; 0 = recalculated
  1310 0000C024 7406                <1> 	je	short loc_check_fcc_FSINFO_op1 ; 1 = add
  1311                              <1> loc_check_fcc_FSINFO_op2: ; subtract
  1312 0000C026 F71D[644D0100]      <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 0000C02C 31D2                <1> 	xor	edx, edx ; 0
  1316 0000C02E 4A                  <1> 	dec	edx ; 0FFFFFFFFh
  1317 0000C02F 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved]
  1318 0000C032 39D0                <1> 	cmp	eax, edx
  1319 0000C034 73D5                <1> 	jnb	short loc_put_fcc_invalid_sign
  1320 0000C036 0305[644D0100]      <1>         add     eax, [CFS_CC] ; free cluster count on disk + current count
  1321 0000C03C 72CD                <1> 	jc	short loc_put_fcc_invalid_sign
  1322                              <1> 	
  1323 0000C03E A3[DB4A0100]        <1> 	mov	[FreeClusterCount], eax
  1324 0000C043 EB0E                <1> 	jmp	short loc_cfs_write_FSINFO_sector
  1325                              <1> 
  1326                              <1> loc_cfs_FAT32_get_rcalc_parms:
  1327 0000C045 8B15[6C4D0100]      <1> 	mov	edx, [CFS_FAT32FC]
  1328 0000C04B A1[DB4A0100]        <1> 	mov	eax, [FreeClusterCount]
  1329 0000C050 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx ; First Free Cluster
  1330                              <1> loc_cfs_write_FSINFO_sector:
  1331 0000C053 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
  1332                              <1> 	; 01/03/2016
  1333 0000C056 E8AA000000          <1> 	call	set_fat32_fsinfo_sector_parms
  1334 0000C05B 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 0000C05D 8B0D[DB4A0100]      <1> 	mov	ecx, [FreeClusterCount]
  1344 0000C063 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1345 0000C067 F7E1                <1> 	mul	ecx
  1346                              <1> 	; 29/02/2016
  1347 0000C069 31C9                <1> 	xor	ecx, ecx ; 0
  1348 0000C06B 09D2                <1> 	or	edx, edx ; 0 ?
  1349 0000C06D 759C                <1>         jnz     loc_put_fcc_invalid_sign
  1350 0000C06F 394670              <1> 	cmp	[esi+LD_TotalSectors], eax ; Volume size in sectors
  1351 0000C072 7697                <1>         jna     short loc_put_fcc_invalid_sign
  1352                              <1> 	;
  1353                              <1> loc_set_FAT32_free_sectors_ok:
  1354 0000C074 31D2                <1> 	xor	edx, edx ; 0
  1355 0000C076 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 0000C078 89C1                <1> 	mov	ecx, eax
  1377                              <1> 
  1378 0000C07A C705[744D0100]FFFF- <1> 	mov	dword [glc_index], 0FFFFFFFFh ; 22/10/2016	
  1378 0000C082 FFFF                <1>
  1379                              <1> 
  1380                              <1> loc_glc_get_next_cluster_1:
  1381 0000C084 890D[704D0100]      <1> 	mov	[glc_prevcluster], ecx
  1382                              <1>  	; 22/10/2016
  1383 0000C08A FF05[744D0100]      <1> 	inc	dword [glc_index]
  1384                              <1> 
  1385                              <1> loc_glc_get_next_cluster_2:
  1386 0000C090 E8E8F7FFFF          <1> 	call	get_next_cluster
  1387                              <1> 	; ecx = current/previous cluster 
  1388                              <1> 	; eax = next/last cluster
  1389 0000C095 73ED                <1> 	jnc	short loc_glc_get_next_cluster_1
  1390                              <1> 
  1391 0000C097 09C0                <1> 	or	eax, eax
  1392 0000C099 7509                <1> 	jnz	short loc_glc_stc_retn
  1393                              <1> 
  1394                              <1> 	; ecx = previous cluster
  1395 0000C09B 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 0000C09D 8B0D[704D0100]      <1> 	mov	ecx, [glc_prevcluster] 
  1402 0000C0A3 C3                  <1> 	retn
  1403                              <1> 
  1404                              <1> loc_glc_stc_retn:
  1405 0000C0A4 F5                  <1> 	cmc	;stc
  1406 0000C0A5 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 0000C0A7 31C9                <1> 	xor	ecx, ecx ; mov ecx, 0
  1426                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1427 0000C0A9 890D[C64A0100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1428                              <1> 
  1429                              <1> loc_tcc_unlink_clusters:
  1430 0000C0AF 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 0000C0B4 73F9                <1> 	jnc short loc_tcc_unlink_clusters
  1437                              <1> 
  1438                              <1> pass_tcc_unlink_clusters:
  1439 0000C0B6 A2[7B4D0100]        <1> 	mov	byte [TCC_FATErr], al
  1440 0000C0BB 803D[BE4A0100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  1441 0000C0C2 750E                <1> 	jne	short loc_tcc_calculate_FAT_freespace
  1442 0000C0C4 E89BFDFFFF          <1> 	call	save_fat_buffer
  1443 0000C0C9 7307                <1> 	jnc	short loc_tcc_calculate_FAT_freespace
  1444 0000C0CB A2[7B4D0100]        <1> 	mov	byte [TCC_FATErr], al ; Error
  1445                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1446                              <1> 
  1447                              <1> 	; 01/03/2016
  1448 0000C0D0 EB12                <1> 	jmp	short loc_tcc_recalculate_FAT_freespace
  1449                              <1> 
  1450                              <1> loc_tcc_calculate_FAT_freespace:
  1451 0000C0D2 A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter] ; signed (+-) number
  1452 0000C0D7 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI = Dos drv desc. table
  1453                              <1> 			   ; BL = 1 -> add cluster
  1454 0000C0DB E819FEFFFF          <1> 	call	calculate_fat_freespace
  1455 0000C0E0 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  1456 0000C0E2 7409                <1> 	jz	short pass_truncate_cc_recalc_FAT_freespace
  1457                              <1> 
  1458                              <1> loc_tcc_recalculate_FAT_freespace:
  1459 0000C0E4 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate !
  1460 0000C0E8 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 0000C0ED 8B0D[C64A0100]      <1> 	mov	ecx, [FAT_ClusterCounter]
  1465                              <1> 
  1466 0000C0F3 803D[7B4D0100]00    <1> 	cmp	byte [TCC_FATErr], 0
  1467 0000C0FA 7608                <1> 	jna	short loc_tcc_unlink_clusters_retn
  1468                              <1> 
  1469                              <1> loc_tcc_unlink_clusters_error:
  1470 0000C0FC 0FB605[7B4D0100]    <1> 	movzx	eax, byte [TCC_FATErr]
  1471 0000C103 F9                  <1> 	stc
  1472                              <1> loc_tcc_unlink_clusters_retn:
  1473 0000C104 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 0000C105 E824000000          <1> 	call	get_fat32_fsinfo_sector_parms
  1491 0000C10A 7221                <1> 	jc	short update_fat32_fsinfo_sector_retn
  1492                              <1> 
  1493 0000C10C 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved] ; Free Cluster Count
  1494 0000C10F 8B563E              <1> 	mov	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free Cluster	
  1495                              <1> 
  1496                              <1>         ;mov	ebx, DOSBootSectorBuff
  1497 0000C112 8983E8010000        <1> 	mov	[ebx+488], eax
  1498 0000C118 8993EC010000        <1> 	mov	[ebx+492], edx	
  1499                              <1> 
  1500 0000C11E A1[684D0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1501 0000C123 B901000000          <1> 	mov	ecx, 1
  1502 0000C128 E8AD2F0000          <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 0000C12D 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 0000C12E 0FB74636            <1> 	movzx	eax, word [esi+LD_BPB+FAT32_FSInfoSec]
  1534 0000C132 03466C              <1> 	add	eax, [esi+LD_StartSector]
  1535 0000C135 A3[684D0100]        <1> 	mov	[CFS_FAT32FSINFOSEC], eax
  1536                              <1> 	
  1537 0000C13A BB[BA480100]        <1>         mov     ebx, DOSBootSectorBuff
  1538 0000C13F B901000000          <1> 	mov	ecx, 1
  1539 0000C144 E8A02F0000          <1> 	call	disk_read
  1540 0000C149 7232                <1> 	jc	short loc_read_FAT32_fsinfo_sec_err
  1541                              <1> 
  1542 0000C14B BB[BA480100]        <1> 	mov	ebx, DOSBootSectorBuff
  1543                              <1> 
  1544 0000C150 813B52526141        <1> 	cmp	dword [ebx], 41615252h
  1545 0000C156 751E                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1546                              <1> 
  1547 0000C158 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
  1547 0000C161 61                  <1>
  1548 0000C162 7512                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1549                              <1> 
  1550 0000C164 A1[684D0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1551 0000C169 8B8BE8010000        <1> 	mov	ecx, [ebx+488] ; free cluster count
  1552 0000C16F 8B93EC010000        <1> 	mov	edx, [ebx+492] ; first (next) free cluster	
  1553                              <1> 
  1554 0000C175 C3                  <1> 	retn
  1555                              <1> 
  1556                              <1> loc_read_FAT32_fsinfo_sec_stc: 
  1557                              <1> 	; 15/10/2016 (0Bh -> 28)
  1558 0000C176 B81C000000          <1> 	mov	eax, 28 ; Invalid format!
  1559 0000C17B 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 0000C17D B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
  1565                              <1> 
  1566                              <1> loc_read_FAT32_fsinfo_sec_stc_retn:
  1567 0000C182 29DB                <1> 	sub	ebx, ebx ; 0
  1568 0000C184 F9                  <1> 	stc
  1569 0000C185 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 0000C186 A3[984E0100]        <1> 	mov	[FAT_anc_LCluster], eax
  1594                              <1> 	
  1595 0000C18B E844F9FFFF          <1> 	call	get_first_free_cluster
  1596 0000C190 720B                <1> 	jc	short loc_add_new_cluster_retn
  1597                              <1> 	; EAX >= 2 and EAX < FFFFFFFFh is valid
  1598                              <1> 
  1599 0000C192 89C2                <1> 	mov	edx, eax
  1600                              <1> 
  1601 0000C194 42                  <1> 	inc	edx
  1602                              <1> 	;jnz	short loc_add_new_cluster_check_ffc_eax
  1603 0000C195 7516                <1> 	jnz	short loc_add_new_cluster_save_fcc
  1604                              <1> 
  1605                              <1> loc_add_new_cluster_no_disk_space_retn:
  1606 0000C197 B827000000          <1> 	mov	eax, 27h ; MSDOS err => insufficient disk space
  1607                              <1> loc_add_new_cluster_stc_retn:
  1608 0000C19C F9                  <1> 	stc
  1609                              <1> loc_add_new_cluster_retn:
  1610 0000C19D 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1611 0000C1A1 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1612                              <1> 	;xor	edx, edx
  1613                              <1> 	;stc
  1614 0000C1A4 C3                  <1> 	retn
  1615                              <1> 
  1616                              <1> loc_anc_invalid_format_stc_retn:
  1617 0000C1A5 F9                  <1> 	stc
  1618                              <1> loc_add_new_cluster_invalid_format_retn:
  1619                              <1> 	; 15/10/2016 (0Bh -> 28)
  1620 0000C1A6 B81C000000          <1> 	mov	eax, 28 ; Invalid format
  1621 0000C1AB 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 0000C1AD A3[9C4E0100]        <1> 	mov	[FAT_anc_FFCluster], eax
  1629                              <1> 
  1630 0000C1B2 83E802              <1> 	sub	eax, 2
  1631 0000C1B5 0FB65E13            <1>         movzx   ebx, byte [esi+LD_BPB+SecPerClust]
  1632 0000C1B9 F7E3                <1> 	mul	ebx
  1633 0000C1BB 09D2                <1> 	or	edx, edx
  1634 0000C1BD 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 0000C1BF 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 0000C1C0 BF00000700          <1> 	mov	edi, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  1651 0000C1C5 89D9                <1> 	mov	ecx, ebx ; sector count
  1652 0000C1C7 C1E107              <1> 	shl	ecx, 7 ; 1 sector = 512 bytes -> 128 double words
  1653                              <1> 	;xor	eax, eax ; 0
  1654 0000C1CA 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 0000C1CC 89D0                <1> 	mov	eax, edx
  1660 0000C1CE 034668              <1>         add     eax, [esi+LD_DATABegin]
  1661 0000C1D1 72D3                <1> 	jc	short loc_add_new_cluster_invalid_format_retn 
  1662                              <1> 		
  1663 0000C1D3 89D9                <1> 	mov	ecx, ebx ; ECX = sectors per cluster (<256)
  1664 0000C1D5 BB00000700          <1> 	mov	ebx, Cluster_Buffer
  1665 0000C1DA E8FB2E0000          <1> 	call	disk_write
  1666 0000C1DF 7307                <1> 	jnc	short loc_add_new_cluster_update_fat_nlc
  1667                              <1> 	
  1668                              <1> 	; 15/10/2016 (1Dh -> 18)
  1669 0000C1E1 B812000000          <1> 	mov	eax, 18 ; Write Error
  1670 0000C1E6 EBB4                <1> 	jmp	short loc_add_new_cluster_stc_retn
  1671                              <1> 
  1672                              <1> loc_add_new_cluster_update_fat_nlc:
  1673 0000C1E8 A1[9C4E0100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1674 0000C1ED 31C9                <1> 	xor	ecx, ecx
  1675 0000C1EF 890D[C64A0100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1676 0000C1F5 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1677 0000C1F6 E8ACF9FFFF          <1> 	call	update_cluster
  1678 0000C1FB 7304                <1> 	jnc	short loc_add_new_cluster_update_fat_plc
  1679 0000C1FD 09C0                <1> 	or	eax, eax ;EAX = 0 -> cluster value is 0 or eocc
  1680 0000C1FF 759B                <1> 	jnz	short loc_add_new_cluster_stc_retn
  1681                              <1> 
  1682                              <1> loc_add_new_cluster_update_fat_plc:
  1683 0000C201 A1[984E0100]        <1> 	mov	eax, [FAT_anc_LCluster]
  1684 0000C206 8B0D[9C4E0100]      <1> 	mov	ecx, [FAT_anc_FFCluster]
  1685 0000C20C E896F9FFFF          <1> 	call	update_cluster
  1686 0000C211 7314                <1> 	jnc	short loc_add_new_cluster_save_fat_buffer
  1687 0000C213 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1688 0000C215 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 0000C217 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1695                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1696 0000C21B 50                  <1> 	push	eax
  1697 0000C21C E8D8FCFFFF          <1> 	call	calculate_fat_freespace
  1698 0000C221 58                  <1> 	pop	eax
  1699 0000C222 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 0000C227 E838FCFFFF          <1> 	call	save_fat_buffer
  1706 0000C22C 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 0000C22E A1[C64A0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1711 0000C233 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI -> Dos drv desc. table
  1712                              <1> 		; BL = 1 -> add cluster
  1713 0000C237 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 0000C239 E8BBFCFFFF          <1>         call    calculate_fat_freespace
  1717                              <1> 	;ECX = 0 -> no error, ECX > 0 -> error or invalid return
  1718 0000C23E 21C9                <1> 	and	ecx, ecx ; ECX = 0 -> valid free sector count
  1719 0000C240 7409                <1> 	jz	short loc_add_new_cluster_return_cluster_number
  1720                              <1> 
  1721                              <1> loc_add_new_cluster_recalc_FAT_freespace:
  1722 0000C242 66BB00FF            <1> 	mov	bx, 0FF00h  ; recalculate free space
  1723 0000C246 E8AEFCFFFF          <1>         call    calculate_fat_freespace
  1724                              <1> 	; cf = 0
  1725                              <1> loc_add_new_cluster_return_cluster_number:
  1726 0000C24B 89C1                <1> 	mov	ecx, eax ; Free sector count
  1727 0000C24D A1[9C4E0100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1728 0000C252 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1729                              <1> 	;mov	edi, Cluster_Buffer
  1730 0000C256 31D2                <1> 	xor	edx, edx
  1731 0000C258 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 0000C259 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 0000C25D 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  1755 0000C261 761C                <1> 	jna	short write_fs_cluster
  1756                              <1> 
  1757                              <1> write_fat_file_sectors: 
  1758 0000C263 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
  1759 0000C266 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
  1760 0000C26A F7E2                <1> 	mul	edx
  1761 0000C26C 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 0000C26F E8662E0000          <1> 	call	disk_write
  1770 0000C274 7306                <1> 	jnc	short wclust_retn
  1771                              <1> 	
  1772                              <1> 	; 15/10/2016 (1Dh -> 18)
  1773 0000C276 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  1774 0000C27B C3                  <1> 	retn
  1775                              <1> 
  1776                              <1> wclust_retn:
  1777 0000C27C 29C0                <1> 	sub	eax, eax ; 0
  1778 0000C27E 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 0000C27F B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
  1793 0000C284 E801000000          <1> 	call	write_fs_sectors
  1794 0000C289 C3                  <1> 	retn
  1795                              <1> 
  1796                              <1> write_fs_sectors:
  1797                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1798 0000C28A F9                  <1> 	stc
  1799 0000C28B 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 0000C28C 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1816 0000C290 721E                <1>         jb      short get_fs_section_by_index 
  1817                              <1> 
  1818 0000C292 3B4E78              <1> 	cmp	ecx, [esi+LD_Clusters]
  1819 0000C295 7207                <1> 	jb	short gcbi_1
  1820                              <1> gcbi_0:
  1821 0000C297 F9                  <1> 	stc
  1822 0000C298 B823000000          <1> 	mov	eax, 23h ; Cluster not available ! 
  1823                              <1> 			 ; MSDOS error code: FCB unavailable
  1824 0000C29D C3                  <1> 	retn
  1825                              <1> gcbi_1:
  1826 0000C29E 51                  <1> 	push	ecx
  1827 0000C29F E8D9F5FFFF          <1> 	call	get_next_cluster
  1828 0000C2A4 59                  <1> 	pop	ecx
  1829 0000C2A5 7203                <1> 	jc	short gcbi_3
  1830 0000C2A7 E2F5                <1> 	loop	gcbi_1
  1831                              <1> gcbi_2:
  1832 0000C2A9 C3                  <1> 	retn
  1833                              <1> gcbi_3:
  1834 0000C2AA 09C0                <1> 	or	eax, eax
  1835 0000C2AC 74E9                <1> 	jz	short gcbi_0
  1836 0000C2AE F5                  <1> 	cmc 	; stc
  1837 0000C2AF 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 0000C2B0 B8FFFFFFFF          <1> 	mov	eax, 0FFFFFFFFh
  1854 0000C2B5 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 0000C2B6 B800000000          <1> 	mov	eax, 0
  1872 0000C2BB BA00000000          <1> 	mov	edx, 0
  1873 0000C2C0 C3                  <1> 	retn
  2309                                  %include 'trdosk6.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - MAIN PROGRAM : trdosk6.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 16/04/2017
     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> ; 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 0000C2C1 368925[F85C0100]    <1>         mov     [ss:u.sp], esp ; Kernel stack points to return address
    54                              <1> 
    55                              <1> 	; save user registers
    56 0000C2C8 1E                  <1> 	push	ds
    57 0000C2C9 06                  <1> 	push	es
    58 0000C2CA 0FA0                <1> 	push	fs
    59 0000C2CC 0FA8                <1> 	push	gs
    60 0000C2CE 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 0000C2CF 50                  <1> 	push	eax ; 01/07/2015
    67 0000C2D0 66B81000            <1> 	mov     ax, KDATA
    68 0000C2D4 8ED8                <1>         mov     ds, ax
    69 0000C2D6 8EC0                <1>         mov     es, ax
    70 0000C2D8 8EE0                <1>         mov     fs, ax
    71 0000C2DA 8EE8                <1>         mov     gs, ax
    72 0000C2DC A1[E0410100]        <1> 	mov	eax, [k_page_dir]
    73 0000C2E1 0F22D8              <1> 	mov	cr3, eax
    74 0000C2E4 58                  <1> 	pop	eax ; 01/07/2015
    75                              <1> 	; 19/10/2015
    76 0000C2E5 FC                  <1> 	cld
    77                              <1> 	;
    78 0000C2E6 FE05[F75C0100]      <1> 	inc	byte [sysflg]
    79                              <1> 		; incb sysflg / indicate a system routine is in progress
    80 0000C2EC FB                  <1>         sti 	; 18/01/2014
    81 0000C2ED 0F851EA0FFFF        <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 0000C2F3 80642438FE          <1> 	and	byte [esp+ESPACE+8], ~1 ; clear carry flag
    87                              <1> 
    88                              <1> 	; 16/04/2015
    89 0000C2F8 A3[005D0100]        <1> 	mov	[u.r0], eax
    90 0000C2FD 8925[FC5C0100]      <1> 	mov	[u.usp], esp ; kernel stack points to user's registers
    91                              <1> 
    92                              <1> 	; 13/01/2017 (TRDOS 386 Feaure only !)
    93 0000C303 803D[705D0100]00    <1> 	cmp	byte [u.t_lock], 0 ; timer interrupt lock ?
    94 0000C30A 0F8799010000        <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 0000C310 C1E002              <1> 	shl	eax, 2
   116                              <1> 		; asl r0 / multiply by 2 to jump indirect in bytes
   117 0000C313 3DB4000000          <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 0000C318 F5                  <1> 	cmc
   122 0000C319 9C                  <1> 	pushf	
   123 0000C31A 50                  <1> 	push	eax
   124 0000C31B 8B2D[F85C0100]      <1>  	mov 	ebp, [u.sp] ; Kernel stack at the beginning of sys call
   125 0000C321 B0FE                <1> 	mov	al, 0FEh ; 11111110b
   126 0000C323 1400                <1> 	adc	al, 0 ; al = al + cf
   127 0000C325 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 0000C328 5D                  <1> 	pop	ebp ; eax
   131 0000C329 9D                  <1> 	popf
   132 0000C32A 0F8204020000        <1>         jc      badsys
   133 0000C330 A1[005D0100]        <1> 	mov	eax, [u.r0]
   134                              <1> 	; system call registers: EAX, EDX, ECX, EBX, ESI, EDI
   135 0000C335 FFA5[3BC30000]      <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> 	; 28/02/2017
   140                              <1> 	; 20/02/2017
   141                              <1> 	; 19/02/2017
   142                              <1> 	; 15/10/2016
   143                              <1> 	; 20/05/2016
   144                              <1> 	; 19/05/2016
   145                              <1> 	; 16/05/2016
   146                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   147                              <1> 	; 21/09/2015
   148                              <1> 	; 01/07/2015
   149                              <1> 	; 16/04/2015 (32 bit address modification) 
   150                              <1> 	;dd sysrele	; / 0
   151 0000C33B [01E70000]          <1> 	dd sysver	; 0 ; Get TRDOS 386 version number (v2.0)	
   152 0000C33F [96C50000]          <1> 	dd sysexit 	; / 1
   153 0000C343 [5AC70000]          <1> 	dd sysfork 	; / 2
   154 0000C347 [8ECB0000]          <1> 	dd sysread 	; / 3
   155 0000C34B [ADCB0000]          <1> 	dd syswrite 	; / 4
   156 0000C34F [44C90000]          <1> 	dd sysopen 	; / 5
   157 0000C353 [65CB0000]          <1> 	dd sysclose 	; / 6
   158 0000C357 [DCC60000]          <1> 	dd syswait 	; / 7
   159 0000C35B [72C80000]          <1> 	dd syscreat 	; / 8
   160 0000C35F [58D70000]          <1> 	dd syslink 	; / 9
   161 0000C363 [A3D70000]          <1> 	dd sysunlink 	; / 10
   162 0000C367 [30D80000]          <1> 	dd sysexec 	; / 11
   163 0000C36B [27DC0000]          <1> 	dd syschdir 	; / 12
   164 0000C36F [06DD0000]          <1> 	dd systime 	; / 13
   165 0000C373 [27CB0000]          <1> 	dd sysmkdir 	; / 14
   166 0000C377 [79DC0000]          <1> 	dd syschmod 	; / 15
   167 0000C37B [D6DC0000]          <1> 	dd syschown 	; / 16
   168 0000C37F [39DD0000]          <1> 	dd sysbreak 	; / 17
   169 0000C383 [D7D90000]          <1> 	dd sysstat 	; / 18
   170 0000C387 [7EDD0000]          <1> 	dd sysseek 	; / 19
   171 0000C38B [90DD0000]          <1> 	dd systell 	; / 20
   172 0000C38F [79DE0000]          <1> 	dd sysmount 	; / 21
   173 0000C393 [8DDE0000]          <1> 	dd sysumount 	; / 22
   174 0000C397 [02DE0000]          <1> 	dd syssetuid 	; / 23
   175 0000C39B [33DE0000]          <1> 	dd sysgetuid 	; / 24
   176 0000C39F [15DD0000]          <1> 	dd sysstime 	; / 25
   177 0000C3A3 [F6DD0000]          <1> 	dd sysquit 	; / 26
   178 0000C3A7 [EADD0000]          <1> 	dd sysintr 	; / 27
   179 0000C3AB [EBD90000]          <1> 	dd sysfstat 	; / 28
   180 0000C3AF [44CC0000]          <1> 	dd sysemt 	; / 29
   181 0000C3B3 [F5CD0000]          <1> 	dd sysmdate 	; / 30
   182                              <1> 	;dd sysstty	; / 31
   183 0000C3B7 [09CE0000]          <1> 	dd sysvideo 	; 31 ; TRDOS 386 Video Functions (16/05/2016)
   184                              <1> 	;dd sysgtty	; / 32
   185 0000C3BB [DAF90000]          <1> 	dd sysaudio 	; 32 ; TRDOS 386 Audio Functions (16/05/2016)
   186                              <1> 	;dd sysilgins	; / 33
   187 0000C3BF [5DCC0000]          <1> 	dd systimer 	; 33 ; TRDOS 386 Timer Functions (18/05/2016)
   188 0000C3C3 [A1DE0000]          <1> 	dd syssleep 	; 34 ; Retro UNIX 8086 v1 feature only !
   189                              <1> 			     ; 11/06/2014
   190 0000C3C7 [D0DE0000]          <1> 	dd sysmsg	; 35 ; Retro UNIX 386 v1 feature only !
   191                              <1> 			     ; 01/07/2015
   192 0000C3CB [A6DF0000]          <1> 	dd sysgeterr	; 36 ; Retro UNIX 386 v1 feature only !
   193                              <1> 			     ; 21/09/2015 - get last error number
   194 0000C3CF [A7F00000]          <1> 	dd sysfpstat	; 37 ; TRDOS 386 FPU state option (28/02/2017)
   195 0000C3D3 [1FE70000]          <1> 	dd syspri 	; 38 ; change priority - TRDOS 386 (20/05/2016)
   196 0000C3D7 [A9C40000]          <1> 	dd sysrele	; 39 ; TRDOS 386 (19/05/2016) (0 -> 39)
   197 0000C3DB [52E80000]          <1> 	dd sysfff	; 40 ; Find First File - TRDOS 386 (15/10/2016)
   198 0000C3DF [31E90000]          <1> 	dd sysfnf	; 41 ; Find Next File - TRDOS 386 (15/10/2016)
   199 0000C3E3 [A1EF0000]          <1> 	dd sysalloc	; 42 ; Allocate contiguous memory block/pages
   200                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions		
   201 0000C3E7 [50F00000]          <1> 	dd sysdalloc	; 43 ; Deallocate contiguous memory block/pages
   202                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions
   203 0000C3EB [8BF00000]          <1> 	dd syscalbac	; 44 ; IRQ Callback and Signal Response Byte
   204                              <1> 			     ; service setup - TRDOS 386 (20/02/2017)
   205                              <1> 	
   206                              <1> end_of_syscalls:
   207                              <1> 
   208                              <1> error:
   209                              <1> 	; 18/05/2016
   210                              <1> 	; 13/05/2016
   211                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   212                              <1> 	; 16/04/2015 - 17/09/2015 (Retro UNIX 386 v1)
   213                              <1> 	; 10/04/2013 - 07/08/2013 (Retro UNIX 8086 v1)
   214                              <1> 	;
   215                              <1> 	; 'error' merely sets the error bit off the processor status (c-bit)
   216                              <1> 	; then falls right into the 'sysret', 'sysrele' return sequence.
   217                              <1> 	;
   218                              <1> 	; INPUTS -> none
   219                              <1> 	; OUTPUTS ->
   220                              <1> 	;	processor status - carry (c) bit is set (means error)
   221                              <1> 	;
   222                              <1> 	; 26/05/2013 (Stack pointer must be reset here! 
   223                              <1> 	; 	      Because, jumps to error procedure
   224                              <1> 	;	      disrupts push-pop nesting balance)
   225                              <1> 	;
   226 0000C3EF 8B2D[F85C0100]      <1> 	mov	ebp, [u.sp] ; interrupt (system call) return (iretd) address
   227 0000C3F5 804D0801            <1> 	or	byte [ebp+8], 1  ; set carry bit of flags register
   228                              <1> 				 ; (system call will return with cf = 1)
   229                              <1> 		; bis $1,20.(r1) / set c bit in processor status word below
   230                              <1> 		               ; / users stack
   231                              <1> 	; 17/09/2015
   232 0000C3F9 83ED30              <1> 	sub	ebp, ESPACE ; 48 ; total size of stack frame ('sysdefs.inc')
   233                              <1> 				 ; for saving/restoring user registers	
   234                              <1> 	;cmp	ebp, [u.usp]
   235                              <1> 	;je	short err0	
   236 0000C3FC 892D[FC5C0100]      <1> 	mov	[u.usp], ebp
   237                              <1> ;err0:
   238                              <1> 	; 01/09/2015
   239 0000C402 8B25[FC5C0100]      <1> 	mov	esp, [u.usp] 	    ; Retro Unix 8086 v1 modification!
   240                              <1> 				    ; 10/04/2013
   241                              <1> 				    ; (If an I/O error occurs during disk I/O,
   242                              <1> 				    ; related procedures will jump to 'error'
   243                              <1> 				    ; procedure directly without returning to 
   244                              <1> 				    ; the caller procedure. So, stack pointer
   245                              <1>                                     ; must be restored here.)
   246                              <1> 	; 13/05/2016
   247                              <1> 	; NOTE: (The last) error code is in 'u.error', it can be retrieved by
   248                              <1> 	;	'get last error' system call later. 	
   249                              <1> 
   250                              <1> 	; 03/09/2015 - 09/06/2015 - 07/08/2013
   251 0000C408 C605[625D0100]00    <1> 	mov 	byte [u.kcall], 0 ; namei_r, mkdir_w reset
   252                              <1> 
   253                              <1> sysret: ; < return from system call>
   254                              <1> 	; 01/03/2017
   255                              <1> 	; 28/02/2017
   256                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   257                              <1> 	; 16/04/2015 - 10/09/2015 (Retro UNIX 386 v1)
   258                              <1> 	; 10/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
   259                              <1> 	;
   260                              <1> 	; 'sysret' first checks to see if process is about to be 
   261                              <1> 	; terminated (u.bsys). If it is, 'sysexit' is called.
   262                              <1> 	; If not, following happens:	 
   263                              <1> 	; 	1) The user's stack pointer is restored.
   264                              <1> 	;	2) r1=0 and 'iget' is called to see if last mentioned
   265                              <1> 	;	   i-node has been modified. If it has, it is written out
   266                              <1> 	;	   via 'ppoke'.
   267                              <1> 	;	3) If the super block has been modified, it is written out
   268                              <1> 	;	   via 'ppoke'.				
   269                              <1> 	;	4) If the dismountable file system's super block has been
   270                              <1> 	;	   modified, it is written out to the specified device
   271                              <1> 	;	   via 'ppoke'.
   272                              <1> 	;	5) A check is made if user's time quantum (uquant) ran out
   273                              <1> 	;	   during his execution. If so, 'tswap' is called to give
   274                              <1> 	;	   another user a chance to run.
   275                              <1> 	;	6) 'sysret' now goes into 'sysrele'. 
   276                              <1> 	;	    (See 'sysrele' for conclusion.)		
   277                              <1> 	;
   278                              <1> 	; Calling sequence:
   279                              <1> 	;	jump table or 'br sysret'
   280                              <1> 	; Arguments: 
   281                              <1> 	;	-	
   282                              <1> 	; ...............................................................
   283                              <1> 	;	
   284                              <1> 	; ((AX=r1 for 'iget' input))
   285                              <1> 	;	
   286 0000C40F 31C0                <1> 	xor	eax, eax ; 28/02/2017
   287                              <1> sysret0: ; 29/07/2015 (eax = 0, jump from sysexec)
   288 0000C411 FEC0                <1> 	inc	al ; 04/05/2013
   289 0000C413 3805[4E5D0100]      <1> 	cmp	[u.bsys], al ; 1
   290                              <1> 		; tstb u.bsys / is a process about to be terminated because
   291 0000C419 0F8377010000        <1>         jnb     sysexit ; 04/05/2013
   292                              <1> 		; bne sysexit / of an error? yes, go to sysexit
   293                              <1> 	;mov	esp, [u.usp] ; 24/05/2013 (that is not needed here)
   294                              <1> 		; mov u.sp,sp / no point stack to users stack
   295 0000C41F FEC8                <1> 	dec 	al ; mov ax, 0
   296                              <1> 		; clr r1 / zero r1 to check last mentioned i-node
   297 0000C421 E8AA2C0000          <1> 	call	iget
   298                              <1> 		; jsr r0,iget / if last mentioned i-node has been modified
   299                              <1> 		            ; / it is written out
   300                              <1> 	; 10/01/2017
   301                              <1> 	; 09/01/2017
   302                              <1> ;sysrele: ; < release >
   303                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   304                              <1> 	; 16/04/2015 - 14/10/2015 (Retro UNIX 386 v1)
   305                              <1> 	; 10/04/2013 - 07/03/2014 (Retro UNIX 8086 v1)
   306                              <1> 	;
   307                              <1> 	; 'sysrele' first calls 'tswap' if the time quantum for a user is
   308                              <1> 	;  zero (see 'sysret'). It then restores the user's registers and
   309                              <1> 	; turns off the system flag. It then checked to see if there is
   310                              <1> 	; an interrupt from the user by calling 'isintr'. If there is, 
   311                              <1> 	; the output gets flashed (see isintr) and interrupt action is
   312                              <1> 	; taken by a branch to 'intract'. If there is no interrupt from
   313                              <1> 	; the user, a rti is made.
   314                              <1> 	;
   315                              <1> 	; Calling sequence:
   316                              <1> 	;	Fall through a 'bne' in 'sysret' & ?
   317                              <1> 	; Arguments:
   318                              <1> 	;	-	
   319                              <1> 	; ...............................................................
   320                              <1> 	;	
   321                              <1> 	; 23/02/2014 (swapret)
   322                              <1> 	; 22/09/2013
   323                              <1> sysrel0: ;1:
   324 0000C426 803D[445D0100]00    <1> 	cmp	byte [u.quant], 0 ; 16/05/2013
   325                              <1> 		; tstb uquant / is the time quantum 0?
   326 0000C42D 7705                <1>         ja      short swapret
   327                              <1> 		; bne 1f / no, don't swap it out
   328                              <1> sysrelease: ; 07/12/2013 (jump from 'clock')
   329 0000C42F E895210000          <1> 	call	tswap
   330                              <1> 		; jsr r0,tswap / yes, swap it out
   331                              <1> 	
   332                              <1> ; Retro Unix 8086 v1 feature: return from 'swap' to 'swapret' address.
   333                              <1> swapret: ;1:
   334                              <1> 	; 10/09/2015
   335                              <1> 	; 01/09/2015
   336                              <1> 	; 14/05/2015
   337                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - 32 bit, pm modifications)
   338                              <1> 	; 26/05/2013 (Retro UNIX 8086 v1)
   339                              <1> 	; cli
   340                              <1> 	; 24/07/2015
   341                              <1> 	;
   342                              <1> 	;; 'esp' must be already equal to '[u.usp]' here ! 
   343                              <1> 	;; mov	esp, [u.usp]
   344                              <1> 
   345                              <1> 	; 22/09/2013
   346 0000C434 E8982C0000          <1> 	call	isintr
   347                              <1> 	; 20/10/2013
   348 0000C439 7405                <1> 	jz	short sysrel1
   349 0000C43B E83F010000          <1> 	call	intract
   350                              <1> 		; jsr r0,isintr / is there an interrupt from the user
   351                              <1> 		;     br intract / yes, output gets flushed, take interrupt
   352                              <1> 		               ; / action
   353                              <1> sysrel1:
   354 0000C440 FA                  <1> 	cli	; 14/10/2015
   355                              <1> sysrel2:
   356                              <1> 	; 28/02/2017
   357                              <1> 	; Check if there is a (delayed) callback for current user/process
   358 0000C441 A0[735D0100]        <1> 	mov	al, [u.irqwait]
   359 0000C446 240F                <1> 	and	al, 0Fh ; is there a waiting IRQ callback service ?
   360 0000C448 7444                <1> 	jz	short sysrel8 ; no
   361                              <1> 
   362                              <1> 	; Set return to IRQ callback service and return from the service
   363 0000C44A 0FB6D8              <1> 	movzx	ebx, al
   364 0000C44D 883D[735D0100]      <1> 	mov 	[u.irqwait], bh ; 0 ; reset
   365 0000C453 8A9B[18080100]      <1> 	mov	bl, [ebx+IRQenum] ; (available) IRQ index +1 (1 to 9)
   366                              <1> 	; 01/03/2017
   367 0000C459 FECB                <1> 	dec	bl ; IRQ index number, 0 to 8
   368 0000C45B 7831                <1> 	js	short sysrel8 ; 0 -> FFh (not in use!?) 
   369                              <1> 	;
   370 0000C45D A0[4F5D0100]        <1> 	mov 	al, [u.uno] ; current process (user) number 
   371 0000C462 3883[16550100]      <1> 	cmp	[ebx+IRQ.owner], al
   372 0000C468 7524                <1> 	jne	short sysrel8 ; it is not the current user/process !?
   373 0000C46A F683[28550100]01    <1> 	test	byte [ebx+IRQ.method], 1 ; callback ?
   374 0000C471 741B                <1> 	jz	short sysrel8 ; not a callback method !?
   375                              <1> 
   376 0000C473 8B93[3A550100]      <1> 	mov	edx, [ebx+IRQ.addr] ; IRQ callback service address (virtual)
   377 0000C479 C605[745D0100]01    <1> 	mov	byte [u.r_lock], 1 ; IRQ callback service in progress flag
   378                              <1> 
   379 0000C480 E8EC210000          <1> 	call	wswap ; save user's registers & status 
   380                              <1> 		      ;	(for return from IRQ callback service)
   381                              <1> 
   382 0000C485 8B2D[F85C0100]      <1> 	mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
   383 0000C48B 895500              <1> 	mov	[ebp], edx ; IRQ call back service address
   384                              <1> sysrel8:
   385 0000C48E FE0D[F75C0100]      <1> 	dec	byte [sysflg]
   386                              <1> 		; decb sysflg / turn system flag off
   387                              <1> 	
   388 0000C494 A1[545D0100]        <1> 	mov	eax, [u.pgdir]	
   389 0000C499 0F22D8              <1> 	mov	cr3, eax  ; 1st PDE points to Kernel Page Table 0 (1st 4 MB)
   390                              <1> 			  ; (others are different than kernel page tables) 
   391                              <1> 	; 10/09/2015
   392 0000C49C 61                  <1> 	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
   393                              <1> 		; mov (sp)+,sc / restore user registers
   394                              <1> 		; mov (sp)+,mq
   395                              <1> 		; mov (sp)+,ac
   396                              <1> 		; mov (sp)+,r5
   397                              <1> 		; mov (sp)+,r4
   398                              <1> 		; mov (sp)+,r3
   399                              <1> 		; mov (sp)+,r2
   400                              <1> 	;
   401 0000C49D A1[005D0100]        <1> 	mov	eax, [u.r0]  ; ((return value in EAX))
   402 0000C4A2 0FA9                <1> 	pop	gs
   403 0000C4A4 0FA1                <1> 	pop	fs
   404 0000C4A6 07                  <1> 	pop	es
   405 0000C4A7 1F                  <1> 	pop	ds
   406                              <1> 	;or	word [esp+8], 200h ; 22/01/2017 ; force enabling interrupts
   407 0000C4A8 CF                  <1> 	iretd	
   408                              <1> 		; rti / no, return from interrupt
   409                              <1> 
   410                              <1> sysrele:
   411                              <1> 	; 24/03/2017
   412                              <1> 	; 28/02/2017
   413                              <1> 	; 27/02/2017
   414                              <1> 	; 29/01/2017
   415                              <1> 	; 14/01/2017
   416                              <1> 	; 13/01/2017
   417                              <1> 	; 09/01/2017, 10/01/2017, 12/01/2017
   418                              <1> 	; Major modification for TRDOS 386 (CallBack return)
   419                              <1> 	;
   420                              <1> 	; 'sysrele' system call restores previously saved
   421                              <1> 	; registers and addresses of the process
   422                              <1> 	; (Main purpose -in TRDOS 386- is to return from
   423                              <1> 	; timer callback service routine in ring 3 -user mode-.)
   424                              <1> 	;
   425                              <1> 	; check if the process is in timer callback phase
   426 0000C4A9 803D[705D0100]00    <1> 	cmp	byte [u.t_lock], 0 ; TIMER INT LOCK
   427                              <1> 	;je	short sysrel0 ; classic (Retro UNIX 386 type) sysrele
   428 0000C4B0 7734                <1> 	ja	short sysrel3
   429                              <1> 	; 27/02/2017
   430 0000C4B2 803D[745D0100]00    <1> 	cmp	byte [u.r_lock], 0 ; IRQ callback lock	
   431 0000C4B9 0F8667FFFFFF        <1> 	jna	sysrel0 ; classic sysrele ; 24/03/2017
   432 0000C4BF E859000000          <1> 	call	sysrel7
   433 0000C4C4 803D[745D0100]00    <1> 	cmp	byte [u.r_lock], 0 ; IRQ callback service lock
   434 0000C4CB 7628                <1> 	jna	short sysrel4
   435 0000C4CD C605[745D0100]00    <1> 	mov	byte [u.r_lock], 0 ; reset
   436                              <1> 	;mov	byte [u.irqwait], 0 ; reset ; 28/02/2017
   437 0000C4D4 A0[755D0100]        <1> 	mov	al, [u.r_mode]
   438 0000C4D9 08C0                <1> 	or	al, al
   439 0000C4DB 7518                <1> 	jnz	short sysrel4
   440 0000C4DD FEC8                <1> 	dec	al
   441 0000C4DF A2[755D0100]        <1> 	mov	[u.r_mode], al ; 0FFh ; not necessary !?
   442 0000C4E4 EB32                <1> 	jmp	short sysrel6		
   443                              <1> sysrel3:
   444                              <1> 	; 27/02/2017
   445 0000C4E6 E832000000          <1> 	call	sysrel7
   446                              <1> 	; 14/01/2017
   447 0000C4EB 28C0                <1> 	sub	al, al
   448 0000C4ED 3805[705D0100]      <1> 	cmp	[u.t_lock], al ; 0 ; TIMER INT LOCK
   449 0000C4F3 770E                <1> 	ja	short sysrel5 ; yes
   450                              <1> sysrel4:
   451                              <1> 	; 29/01/2017
   452 0000C4F5 8B44241C            <1> 	mov	eax, [esp+28] ; eax
   453 0000C4F9 A3[005D0100]        <1> 	mov	[u.r0], eax
   454 0000C4FE E93EFFFFFF          <1> 	jmp	sysrel2
   455                              <1> sysrel5:
   456 0000C503 A2[705D0100]        <1> 	mov	[u.t_lock], al ; 0 ; reset
   457 0000C508 A0[715D0100]        <1> 	mov	al, [u.t_mode]
   458 0000C50D 20C0                <1> 	and	al, al
   459                              <1> 	;jnz	short sysrel2 ; 0FFh ; user mode
   460 0000C50F 75E4                <1> 	jnz	short sysrel4 ; 29/01/2017
   461 0000C511 FEC8                <1> 	dec	al
   462 0000C513 A2[715D0100]        <1> 	mov	[u.t_mode], al ; 0FFh ; not necessary !?
   463                              <1> sysrel6:
   464                              <1> 	; cpu will continue from the interrupted sytem call addr
   465 0000C518 61                  <1> 	popad		; edi, esi, ebp, esp, ebx, edx, ecx, eax
   466 0000C519 83C410              <1> 	add	esp, 16	; pass segment segisters: ds, es, fs, gs		
   467 0000C51C CF                  <1> 	iretd		; eip, cs, eflags
   468                              <1> 
   469                              <1> sysrel7:
   470 0000C51D 0FB61D[4F5D0100]    <1> 	movzx	ebx, byte [u.uno] ; current process number
   471 0000C524 66C1E302            <1> 	shl	bx, 2
   472                              <1> 	;cmp	[ebx+p.tcb-4], eax ; 0 ; is there callback address ?
   473                              <1> 	;jna	short sysrel0 
   474                              <1> 	; yes, reset callback address then restore process registers 
   475                              <1> 	;mov	[ebx+p.tcb-4], eax ; 0 ; reset
   476 0000C528 8B83[585A0100]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address
   477 0000C52E FA                  <1> 	cli	; disable interrupts till 'iretd'
   478 0000C52F E975210000          <1> 	jmp	rswap ; restore process 'u' structure
   479                              <1>  
   480                              <1> badsys:
   481                              <1> 	; 25/12/2016
   482                              <1> 	; 18/04/2016 (TRDOS 386 = TRDOS v2.0)
   483                              <1> 	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
   484                              <1> 	; 03/02/2011 ('trdos_ifc_routine')
   485                              <1> 	;
   486                              <1> 	; 16/04/2015 (Retro UNIX 386 v1, 'badsys')
   487                              <1> 	; (EIP, EAX values will be shown on screen with error message)
   488                              <1> 	; (EIP = 'CD 40h' instruction address -INT 40h-)
   489                              <1> 	; (EAX = Function number)  
   490                              <1> 	;
   491 0000C534 FE05[4E5D0100]      <1> 	inc	byte [u.bsys]
   492                              <1> 	;
   493 0000C53A 8B1D[F85C0100]      <1> 	mov	ebx, [u.sp] ; esp at the beginning of 'sysent'
   494 0000C540 8B03                <1> 	mov	eax, [ebx] ; EIP (return address, not 'INT 30h' address)
   495 0000C542 83E802              <1> 	sub	eax, 2 ; CDh, ##h
   496 0000C545 E8BF6DFFFF          <1> 	call	dwordtohex
   497 0000C54A 8915[F1050100]      <1> 	mov	[eip_str], edx
   498 0000C550 A3[F5050100]        <1> 	mov	[eip_str+4], eax
   499 0000C555 A1[005D0100]        <1> 	mov	eax, [u.r0]
   500 0000C55A E8AA6DFFFF          <1> 	call	dwordtohex
   501 0000C55F 8915[E0050100]      <1> 	mov	[eax_str], edx
   502 0000C565 A3[E4050100]        <1> 	mov	[eax_str+4], eax
   503                              <1> 
   504 0000C56A 66C705[D5050100]34- <1> 	mov	word [int_num_str], SYSCALL_INT_NUM ; 25/12/2016
   504 0000C572 30                  <1>
   505                              <1> 
   506 0000C573 BE[A7050100]        <1> 	mov	esi, ifc_msg ; "invalid funtion call !" msg (trdosk9.s)
   507 0000C578 E8409DFFFF          <1> 	call	print_msg
   508                              <1> 
   509 0000C57D EB17                <1> 	jmp	sysexit
   510                              <1> 
   511                              <1> intract: ; / interrupt action
   512                              <1> 	; 14/10/2015
   513                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   514                              <1> 	; 09/05/2013 - 07/12/2013 (Retro UNIX 8086 v1)
   515                              <1> 	;
   516                              <1> 	; Retro UNIX 8086 v1 modification !
   517                              <1> 	; (Process/task switching and quit routine by using
   518                              <1> 	; Retro UNIX 8086 v1 keyboard interrupt output.))
   519                              <1> 	;
   520                              <1> 	; input -> 'u.quit'  (also value of 'u.intr' > 0)
   521                              <1> 	; output -> If value of 'u.quit' = FFFFh ('ctrl+brk' sign)
   522                              <1> 	;		'intract' will jump to 'sysexit'.
   523                              <1> 	;	    Intract will return to the caller 
   524                              <1> 	;		if value of 'u.quit' <> FFFFh. 	 
   525                              <1> 	; 14/10/2015
   526 0000C57F FB                  <1> 	sti
   527                              <1> 	; 07/12/2013	
   528 0000C580 66FF05[485D0100]    <1> 	inc 	word [u.quit]
   529 0000C587 7408                <1> 	jz	short intrct0 ; FFFFh -> 0
   530 0000C589 66FF0D[485D0100]    <1> 	dec	word [u.quit]
   531                              <1> 	; 16/04/2015
   532 0000C590 C3                  <1> 	retn
   533                              <1> intrct0:	
   534 0000C591 58                  <1> 	pop	eax ; call intract -> retn
   535                              <1> 	;
   536 0000C592 31C0                <1> 	xor 	eax, eax
   537 0000C594 FEC0                <1> 	inc	al  ; mov ax, 1
   538                              <1> ;;;
   539                              <1> 	; UNIX v1 original 'intract' routine... 
   540                              <1> 	; / interrupt action
   541                              <1> 		;cmp *(sp),$rti / are you in a clock interrupt?
   542                              <1> 		; bne 1f / no, 1f
   543                              <1> 		; cmp (sp)+,(sp)+ / pop clock pointer
   544                              <1> 	; 1: / now in user area
   545                              <1> 		; mov r1,-(sp) / save r1
   546                              <1> 		; mov u.ttyp,r1 
   547                              <1> 			; / pointer to tty buffer in control-to r1
   548                              <1> 		; cmpb 6(r1),$177
   549                              <1> 			; / is the interrupt char equal to "del"
   550                              <1> 		; beq 1f / yes, 1f
   551                              <1> 		; clrb 6(r1) 
   552                              <1> 		        ; / no, clear the byte 
   553                              <1> 			; / (must be a quit character)
   554                              <1> 		; mov (sp)+,r1 / restore r1
   555                              <1> 		; clr u.quit / clear quit flag
   556                              <1> 		; bis $20,2(sp) 
   557                              <1> 		    	; / set trace for quit (sets t bit of 
   558                              <1> 			; / ps-trace trap)
   559                              <1> 		; rti   ;  / return from interrupt
   560                              <1> 	; 1: / interrupt char = del
   561                              <1> 		; clrb 6(r1) / clear the interrupt byte 
   562                              <1> 			   ; / in the buffer
   563                              <1> 		; mov (sp)+,r1 / restore r1
   564                              <1> 		; cmp u.intr,$core / should control be 
   565                              <1> 				; / transferred to loc core?
   566                              <1> 		; blo 1f
   567                              <1> 		; jmp *u.intr / user to do rti yes, 
   568                              <1> 				; / transfer to loc core
   569                              <1> 	; 1:
   570                              <1> 		; sys 1 / exit
   571                              <1> 
   572                              <1> sysexit: ; <terminate process>
   573                              <1> 	; 10/04/2017
   574                              <1> 	; 28/02/2017
   575                              <1> 	; 26/02/2017
   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 0000C596 6648                <1> 	dec 	ax ; 0
   621 0000C598 66A3[465D0100]      <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 0000C59E FA                  <1> 	cli	; disable interrupts
   636                              <1> 	; 23/01/2017 - reset timer frequency (to 18.2Hz)
   637 0000C59F B036                <1> 	mov	al, 00110110b ; 36h
   638 0000C5A1 E643                <1>  	out	43h, al
   639 0000C5A3 28C0                <1> 	sub	al, al ; 0
   640 0000C5A5 E640                <1> 	out	40h, al ; LB
   641 0000C5A7 E640                <1> 	out	40h, al ; HB
   642                              <1>  	; 
   643 0000C5A9 0FB61D[4F5D0100]    <1> 	movzx	ebx, byte [u.uno]
   644                              <1> 	;mov	bl, [u.uno] ; process number of dying process
   645 0000C5B0 3883[9B5A0100]      <1> 	cmp	byte [ebx+p.timer-1], al ; 0
   646 0000C5B6 763B                <1> 	jna	short sysexit_12 ; no timer events for this process
   647 0000C5B8 8883[9B5A0100]      <1> 	mov	byte [ebx+p.timer-1], al ; 0 ; reset
   648 0000C5BE A0[774F0100]        <1> 	mov	al, [timer_events]
   649                              <1> 	;or	al, al
   650                              <1>  	;jz	short sysexit_12 ; no timer events
   651 0000C5C3 88C1                <1> 	mov	cl, al
   652                              <1> 	;cli	; disable interrupts 
   653 0000C5C5 B410                <1> 	mov	ah, 16 ; number of available timer events
   654 0000C5C7 BE[FC5D0100]        <1> 	mov	esi, timer_set ; beginning address of timer events
   655                              <1> sysexit_7:
   656 0000C5CC 8A06                <1> 	mov	al, [esi] ; process number (of timer event)
   657 0000C5CE 38D8                <1> 	cmp	al, bl ; process number comparison
   658 0000C5D0 7411                <1> 	je	short sysexit_10
   659 0000C5D2 20C0                <1> 	and	al, al
   660 0000C5D4 7404                <1> 	jz	short sysexit_9
   661                              <1> sysexit_8:
   662 0000C5D6 FEC9                <1> 	dec	cl
   663 0000C5D8 7416                <1> 	jz	short sysexit_11
   664                              <1> sysexit_9:
   665 0000C5DA FECC                <1> 	dec	ah
   666 0000C5DC 7415                <1> 	jz	short sysexit_12
   667 0000C5DE 83C610              <1> 	add	esi, 16
   668 0000C5E1 EBE9                <1> 	jmp	short sysexit_7
   669                              <1> 
   670                              <1> sysexit_10:
   671                              <1> 	;mov	byte [esi], 0
   672 0000C5E3 66C7060000          <1> 	mov	word [esi], 0
   673                              <1> 	;mov	dword [esi+12], 0
   674                              <1> 	;
   675 0000C5E8 FE0D[774F0100]      <1> 	dec	byte [timer_events] ; 02/01/2017
   676                              <1> 	;
   677 0000C5EE EBE6                <1> 	jmp	short sysexit_8
   678                              <1> 
   679                              <1> sysexit_11:
   680 0000C5F0 6629C0              <1> 	sub	ax, ax ; 0 ; 26/02/2017
   681                              <1> sysexit_12:
   682                              <1> 	; 26/02/2017 (Unlink IRQ callbacks belong to the user)
   683 0000C5F3 803D[725D0100]00    <1> 	cmp	byte [u.irqc], 0 ; Count of IRQ callbacks
   684 0000C5FA 7E2E                <1> 	jng	short sysexit_16 ; zero or invalid
   685                              <1> 	; 28/02/2017
   686                              <1> 	; clear IRQ callback flags (for 'sysrele' and 'sysret')
   687 0000C5FC A2[735D0100]        <1> 	mov	[u.irqwait], al ; 0 ; force to clear waiting flag
   688 0000C601 A2[745D0100]        <1> 	mov	[u.r_lock], al ; 0 ; force to clear busy flag
   689 0000C606 BE[16550100]        <1> 	mov	esi, IRQ.owner
   690                              <1> sysexit_13:	
   691 0000C60B AC                  <1> 	lodsb
   692 0000C60C 3A05[4F5D0100]      <1> 	cmp	al, [u.uno] ; owner  = current user ?
   693 0000C612 750C                <1> 	jne	short sysexit_14
   694 0000C614 C646FF00            <1> 	mov	byte [esi-1], 0 ; owner = 0 : Free
   695 0000C618 FE0D[725D0100]      <1> 	dec	byte [u.irqc]
   696 0000C61E 7408                <1> 	jz	short sysexit_15
   697                              <1> sysexit_14:
   698 0000C620 81FE[1E550100]      <1> 	cmp	esi, IRQ.owner + 8 ; the last IRQ index number ?
   699 0000C626 76E3                <1> 	jna	short sysexit_13 ; no
   700                              <1> sysexit_15:
   701 0000C628 30C0                <1> 	xor	al, al ; 0
   702                              <1> sysexit_16: ; 2:
   703 0000C62A FB                  <1> 	sti	; enable interrupts 
   704                              <1> 	;
   705                              <1> 	; AX = 0
   706                              <1> sysexit_1: ; 1:
   707                              <1> 	; AX = File descriptor
   708                              <1> 		; / r1 has file descriptor (index to u.fp list)
   709                              <1> 		; / Search the whole list
   710 0000C62B E8CF130000          <1> 	call	fclose
   711                              <1> 		; jsr r0,fclose / close all files the process opened
   712                              <1> 	;; ignore error return
   713                              <1> 		; br .+2 / ignore error return
   714                              <1> 	;inc	ax
   715 0000C630 FEC0                <1> 	inc	al
   716                              <1> 		; inc r1 / increment file descriptor
   717                              <1> 	;cmp	ax, 10
   718 0000C632 3C0A                <1> 	cmp	al, 10
   719                              <1> 		; cmp r1,$10. / end of u.fp list?
   720 0000C634 72F5                <1> 	jb	short sysexit_1
   721                              <1> 		; blt 1b / no, go back
   722                              <1> 	;movzx	ebx, byte [u.uno]
   723 0000C636 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno] ; 02/01/2017
   724                              <1> 		; movb	u.uno,r1 / yes, move dying process's number to r1
   725 0000C63C 88A3[4B5A0100]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   726                              <1> 		; clrb p.stat-1(r1) / free the process
   727                              <1> 	; 10/04/2017
   728 0000C642 381D[8D550100]      <1> 	cmp	[audio_user], bl
   729 0000C648 7506                <1> 	jne	short sysexit_17
   730                              <1> 	; reset audio device (current) owner and 'initializated' flag
   731 0000C64A 883D[8D550100]      <1> 	mov	[audio_user], bh ; 0
   732                              <1> sysexit_17:
   733                              <1> 	;shl	bx, 1
   734 0000C650 D0E3                <1> 	shl	bl, 1
   735                              <1> 		; asl r1 / use r1 for index into the below tables
   736 0000C652 668B8B[BA590100]    <1> 	mov	cx, [ebx+p.pid-2]
   737                              <1> 		; mov p.pid-2(r1),r3 / move dying process's name to r3
   738 0000C659 668B93[DA590100]    <1> 	mov	dx, [ebx+p.ppid-2]
   739                              <1> 		; mov p.ppid-2(r1),r4 / move its parents name to r4
   740                              <1> 	; xor 	bx, bx ; 0
   741 0000C660 30DB                <1> 	xor	bl, bl ; 0
   742                              <1> 		; clr r2
   743 0000C662 31F6                <1> 	xor	esi, esi ; 0
   744                              <1> 		; clr r5 / initialize reg
   745                              <1> sysexit_2: ; 1:
   746                              <1> 	        ; / find children of this dying process, 
   747                              <1> 		; / if they are zombies, free them
   748                              <1> 	;add	bx, 2
   749 0000C664 80C302              <1> 	add	bl, 2
   750                              <1> 		; add $2,r2 / search parent process table 
   751                              <1> 		          ; / for dying process's name
   752 0000C667 66398B[DA590100]    <1> 	cmp	[ebx+p.ppid-2], cx
   753                              <1> 		; cmp p.ppid-2(r2),r3 / found it?
   754 0000C66E 7513                <1> 	jne	short sysexit_4
   755                              <1> 		; bne 3f / no
   756                              <1> 	;shr	bx, 1
   757 0000C670 D0EB                <1> 	shr	bl, 1
   758                              <1> 		; asr r2 / yes, it is a parent
   759 0000C672 80BB[4B5A0100]03    <1> 	cmp	byte [ebx+p.stat-1], 3 ; SZOMB
   760                              <1> 		; cmpb p.stat-1(r2),$3 / is the child of this 
   761                              <1> 				     ; / dying process a zombie
   762 0000C679 7506                <1> 	jne	short sysexit_3 
   763                              <1> 		; bne 2f / no
   764 0000C67B 88A3[4B5A0100]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   765                              <1> 		; clrb p.stat-1(r2) / yes, free the child process
   766                              <1> sysexit_3: ; 2:
   767                              <1> 	;shr	bx, 1
   768 0000C681 D0E3                <1> 	shl	bl, 1
   769                              <1> 		; asl r2
   770                              <1> sysexit_4: ; 3:
   771                              <1> 		; / search the process name table 
   772                              <1> 		; / for the dying process's parent
   773 0000C683 663993[BA590100]    <1> 	cmp	[ebx+p.pid-2], dx
   774                              <1> 		; cmp p.pid-2(r2),r4 / found it?
   775 0000C68A 7502                <1> 	jne	short sysexit_5
   776                              <1> 		; bne 3f / no
   777 0000C68C 89DE                <1> 	mov	esi, ebx
   778                              <1> 		; mov r2,r5 / yes, put index to p.pid table (parents
   779                              <1> 		          ; / process # x2) in r5
   780                              <1> sysexit_5: ; 3:
   781                              <1> 	;cmp	bx, nproc + nproc
   782 0000C68E 80FB20              <1> 	cmp	bl, nproc + nproc
   783                              <1> 		; cmp r2,$nproc+nproc / has whole table been searched?
   784 0000C691 72D1                <1> 	jb	short sysexit_2
   785                              <1> 		; blt 1b / no, go back
   786                              <1> 		; mov r5,r1 / yes, r1 now has parents process # x2
   787 0000C693 21F6                <1> 	and	esi, esi ; r5=r1
   788 0000C695 7436                <1> 	jz	short sysexit_6
   789                              <1> 		; beq 2f / no parent has been found. 
   790                              <1> 		       ; / The process just dies
   791 0000C697 66D1EE              <1> 	shr	si, 1
   792                              <1> 		; asr r1 / set up index to p.stat
   793 0000C69A 8A86[4B5A0100]      <1> 	mov	al, [esi+p.stat-1]
   794                              <1> 		; movb p.stat-1(r1),r2 / move status of parent to r2
   795 0000C6A0 20C0                <1> 	and	al, al
   796 0000C6A2 7429                <1> 	jz	short sysexit_6
   797                              <1> 		; beq 2f / if its been freed, 2f
   798 0000C6A4 3C03                <1> 	cmp	al, 3
   799                              <1> 		; cmp r2,$3 / is parent a zombie?
   800 0000C6A6 7425                <1> 	je	short sysexit_6
   801                              <1> 		; beq 2f / yes, 2f
   802                              <1> 	; BH = 0
   803 0000C6A8 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno]
   804                              <1> 		; movb u.uno,r3 / move dying process's number to r3
   805 0000C6AE C683[4B5A0100]03    <1> 	mov	byte [ebx+p.stat-1], 3  ; SZOMB
   806                              <1> 		; movb $3,p.stat-1(r3) / make the process a zombie
   807 0000C6B5 3C01                <1> 	cmp	al, 1 ; SRUN
   808 0000C6B7 7414                <1> 	je	short sysexit_6
   809                              <1> 	;cmp	al, 2
   810                              <1> 		; cmp r2,$2 / is the parent waiting for 
   811                              <1> 			  ; / this child to die
   812                              <1> 	;jne	short sysexit_6	
   813                              <1> 		; bne 2f / yes, notify parent not to wait any more
   814                              <1> 	; p.stat = 2 --> waiting
   815                              <1> 	; p.stat = 4 --> sleeping
   816 0000C6B9 C686[4B5A0100]01    <1> 	mov	byte [esi+p.stat-1], 1 ; SRUN
   817                              <1> 	;dec	byte [esi+p.stat-1]
   818                              <1> 		; decb	p.stat-1(r1) / awaken it by putting it (parent)
   819 0000C6C0 6689F0              <1> 	mov	ax, si ; r1  (process number in AL)
   820                              <1> 	; 
   821                              <1> 	;mov	ebx, runq + 4
   822                              <1> 		; mov $runq+4,r2 / on the runq
   823 0000C6C3 BB[F05C0100]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017
   824 0000C6C8 E814200000          <1> 	call	putlu
   825                              <1> 		; jsr r0, putlu
   826                              <1> sysexit_6: 
   827                              <1> 		; / the process dies
   828 0000C6CD C605[4F5D0100]00    <1> 	mov	byte [u.uno], 0
   829                              <1> 		; clrb u.uno / put zero as the process number, 
   830                              <1> 	           ; / so "swap" will
   831 0000C6D4 E80A1F0000          <1> 	call	swap
   832                              <1> 		; jsr r0,swap / overwrite process with another process
   833                              <1> 
   834                              <1> hlt_sys:
   835                              <1> 	;sti
   836                              <1> hlts0:
   837 0000C6D9 F4                  <1> 	hlt
   838 0000C6DA EBFD                <1> 	jmp	short hlts0
   839                              <1> 		; 0 / and thereby kill it; halt?
   840                              <1> 
   841                              <1> syswait: ; < wait for a processs to die >
   842                              <1> 	; 17/09/2015
   843                              <1> 	; 02/09/2015
   844                              <1> 	; 01/09/2015
   845                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   846                              <1> 	; 24/05/2013 - 05/02/2014 (Retro UNIX 8086 v1)
   847                              <1> 	;
   848                              <1> 	; 'syswait' waits for a process die. 
   849                              <1> 	; It works in following way:
   850                              <1> 	;    1) From the parent process number, the parent's 
   851                              <1> 	; 	process name is found. The p.ppid table of parent
   852                              <1> 	;	names is then searched for this process name.
   853                              <1> 	;	If a match occurs, r2 contains child's process
   854                              <1> 	;	number. The child status is checked to see if it is
   855                              <1> 	;	a zombie, i.e; dead but not waited for (p.stat=3)
   856                              <1> 	;	If it is, the child process is freed and it's name
   857                              <1> 	;	is put in (u.r0). A return is then made via 'sysret'.
   858                              <1> 	;	If the child is not a zombie, nothing happens and
   859                              <1> 	;	the search goes on through the p.ppid table until
   860                              <1> 	;	all processes are checked or a zombie is found.
   861                              <1> 	;    2) If no zombies are found, a check is made to see if
   862                              <1> 	;	there are any children at all. If there are none,
   863                              <1> 	;	an error return is made. If there are, the parent's
   864                              <1> 	;	status is set to 2 (waiting for child to die),
   865                              <1> 	;	the parent is swapped out, and a branch to 'syswait'
   866                              <1> 	;	is made to wait on the next process.
   867                              <1> 	;
   868                              <1> 	; Calling sequence:
   869                              <1> 	;	?
   870                              <1> 	; Arguments:
   871                              <1> 	;	-
   872                              <1> 	; Inputs: - 
   873                              <1> 	; Outputs: if zombie found, it's name put in u.r0.	
   874                              <1> 	; ...............................................................
   875                              <1> 	;				
   876                              <1> 	
   877                              <1> ; / wait for a process to die
   878                              <1> 
   879                              <1> syswait_0:
   880 0000C6DC 0FB61D[4F5D0100]    <1> 	movzx	ebx, byte [u.uno] ; 01/09/2015
   881                              <1> 		; movb u.uno,r1 / put parents process number in r1
   882 0000C6E3 D0E3                <1> 	shl	bl, 1
   883                              <1> 	;shl	bx, 1
   884                              <1> 		; asl r1 / x2 to get index into p.pid table
   885 0000C6E5 668B83[BA590100]    <1> 	mov	ax, [ebx+p.pid-2]
   886                              <1> 		; mov p.pid-2(r1),r1 / get the name of this process
   887 0000C6EC 31F6                <1> 	xor	esi, esi
   888                              <1> 		; clr r2
   889 0000C6EE 31C9                <1> 	xor	ecx, ecx ; 30/10/2013
   890                              <1> 	;xor 	cl, cl
   891                              <1> 		; clr r3 / initialize reg 3
   892                              <1> syswait_1: ; 1:
   893 0000C6F0 6683C602            <1> 	add	si, 2
   894                              <1> 		; add $2,r2 / use r2 for index into p.ppid table
   895                              <1> 			  ; / search table of parent processes 
   896                              <1> 			  ; / for this process name
   897 0000C6F4 663B86[DA590100]    <1> 	cmp	ax, [esi+p.ppid-2]
   898                              <1> 		; cmp p.ppid-2(r2),r1 / r2 will contain the childs 
   899                              <1> 			            ; / process number
   900 0000C6FB 7535                <1> 	jne	short syswait_3
   901                              <1> 		;bne 3f / branch if no match of parent process name
   902                              <1> 	;inc	cx
   903 0000C6FD FEC1                <1> 	inc	cl
   904                              <1> 		;inc r3 / yes, a match, r3 indicates number of children
   905 0000C6FF 66D1EE              <1> 	shr	si, 1
   906                              <1> 		; asr r2 / r2/2 to get index to p.stat table
   907                              <1> 	; The possible states ('p.stat' values) of a process are:
   908                              <1> 	;	0 = free or unused
   909                              <1> 	;	1 = active
   910                              <1> 	;	2 = waiting for a child process to die
   911                              <1> 	;	3 = terminated, but not yet waited for (zombie).	
   912 0000C702 80BE[4B5A0100]03    <1> 	cmp	byte [esi+p.stat-1], 3 ; SZOMB, 05/02/2014
   913                              <1> 		; cmpb p.stat-1(r2),$3 / is the child process a zombie?
   914 0000C709 7524                <1> 	jne	short syswait_2
   915                              <1> 		; bne 2f / no, skip it
   916 0000C70B 88BE[4B5A0100]      <1> 	mov	[esi+p.stat-1], bh ; 0
   917                              <1> 		; clrb p.stat-1(r2) / yes, free it
   918 0000C711 66D1E6              <1> 	shl	si, 1
   919                              <1> 		; asl r2 / r2x2 to get index into p.pid table
   920 0000C714 0FB786[BA590100]    <1> 	movzx	eax, word [esi+p.pid-2]
   921 0000C71B A3[005D0100]        <1> 	mov	[u.r0], eax
   922                              <1> 		; mov p.pid-2(r2),*u.r0 
   923                              <1> 			      ; / put childs process name in (u.r0)
   924                              <1> 	;
   925                              <1> 	; Retro UNIX 386 v1 modification ! (17/09/2015)
   926                              <1> 	;
   927                              <1> 	; Parent process ID -p.ppid- field (of the child process)
   928                              <1> 	; must be cleared in order to prevent infinitive 'syswait'
   929                              <1> 	; system call loop from the application/program if it calls
   930                              <1> 	; 'syswait' again (mistakenly) while there is not a zombie
   931                              <1> 	; or running child process to wait. ('forktest.s', 17/09/2015)
   932                              <1> 	;
   933                              <1> 	; Note: syswait will return with error if there is not a
   934                              <1> 	;       zombie or running process to wait.	
   935                              <1> 	;
   936 0000C720 6629C0              <1> 	sub	ax, ax
   937 0000C723 668986[DA590100]    <1> 	mov 	[esi+p.ppid-2], ax ; 0 ; 17/09/2015
   938 0000C72A E9E2FCFFFF          <1> 	jmp	sysret0 ; ax = 0
   939                              <1> 	;
   940                              <1> 	;jmp	sysret
   941                              <1> 		; br sysret1 / return cause child is dead
   942                              <1> syswait_2: ; 2:
   943 0000C72F 66D1E6              <1> 	shl	si, 1
   944                              <1> 		; asl r2 / r2x2 to get index into p.ppid table
   945                              <1> syswait_3: ; 3:
   946 0000C732 6683FE20            <1> 	cmp	si, nproc+nproc
   947                              <1> 		; cmp r2,$nproc+nproc / have all processes been checked?
   948 0000C736 72B8                <1> 	jb	short syswait_1
   949                              <1> 		; blt 1b / no, continue search
   950                              <1> 	;and	cx, cx
   951 0000C738 20C9                <1> 	and	cl, cl
   952                              <1> 		; tst r3 / one gets here if there are no children 
   953                              <1> 		       ; / or children that are still active
   954                              <1> 	; 30/10/2013
   955 0000C73A 750B                <1> 	jnz	short syswait_4
   956                              <1> 	;jz	error
   957                              <1> 		; beq error1 / there are no children, error
   958 0000C73C 890D[005D0100]      <1> 	mov	[u.r0], ecx ; 0
   959 0000C742 E9A8FCFFFF          <1> 	jmp	error
   960                              <1> syswait_4:
   961 0000C747 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno]
   962                              <1> 		; movb u.uno,r1 / there are children so put 
   963                              <1> 			      ; / parent process number in r1
   964 0000C74D FE83[4B5A0100]      <1> 	inc	byte [ebx+p.stat-1] ; 2, SWAIT, 05/02/2014
   965                              <1> 		; incb p.stat-1(r1) / it is waiting for 
   966                              <1> 				  ; / other children to die
   967                              <1> 	; 04/11/2013
   968 0000C753 E88B1E0000          <1> 	call	swap
   969                              <1> 		; jsr r0,swap / swap it out, because it's waiting
   970 0000C758 EB82                <1> 	jmp	syswait_0
   971                              <1> 		; br syswait / wait on next process
   972                              <1> 
   973                              <1> sysfork: ; < create a new process >
   974                              <1> 	; 02/01/2017 (TRDOS 386 modification)
   975                              <1> 	; 04/09/2015, 18/05/2015
   976                              <1> 	; 28/08/2015, 01/09/2015, 02/09/2015
   977                              <1> 	; 09/05/2015, 10/05/2015, 14/05/2015
   978                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 - Beginning)
   979                              <1> 	; 24/05/2013 - 14/02/2014 (Retro UNIX 8086 v1)
   980                              <1> 	;
   981                              <1> 	; 'sysfork' creates a new process. This process is referred
   982                              <1> 	; to as the child process. This new process core image is
   983                              <1> 	; a copy of that of the caller of 'sysfork'. The only
   984                              <1> 	; distinction is the return location and the fact that (u.r0)
   985                              <1> 	; in the old process (parent) contains the process id (p.pid)
   986                              <1> 	; of the new process (child). This id is used by 'syswait'.
   987                              <1> 	; 'sysfork' works in the following manner: 	
   988                              <1> 	;    1) The process status table (p.stat) is searched to find
   989                              <1> 	;	a process number that is unused. If none are found
   990                              <1> 	;	an error occurs.
   991                              <1> 	;    2) when one is found, it becomes the child process number
   992                              <1> 	;	and it's status (p.stat) is set to active.
   993                              <1> 	;    3) If the parent had a control tty, the interrupt 
   994                              <1> 	;	character in that tty buffer is cleared.
   995                              <1> 	;    4) The child process is put on the lowest priority run 
   996                              <1> 	;	queue via 'putlu'.
   997                              <1> 	;    5) A new process name is gotten from 'mpid' (actually 
   998                              <1> 	;	it is a unique number) and is put in the child's unique
   999                              <1> 	;	identifier; process id (p.pid).
  1000                              <1> 	;    6) The process name of the parent is then obtained and
  1001                              <1> 	;	placed in the unique identifier of the parent process
  1002                              <1> 	;	name is then put in 'u.r0'.	
  1003                              <1> 	;    7) The child process is then written out on disk by
  1004                              <1> 	;	'wswap',i.e., the parent process is copied onto disk
  1005                              <1> 	;	and the child is born. (The child process is written 
  1006                              <1> 	;	out on disk/drum with 'u.uno' being the child process
  1007                              <1> 	;	number.)
  1008                              <1> 	;    8) The parent process number is then restored to 'u.uno'.
  1009                              <1> 	;    9) The child process name is put in 'u.r0'.
  1010                              <1> 	;   10) The pc on the stack sp + 18 is incremented by 2 to
  1011                              <1> 	;	create the return address for the parent process.
  1012                              <1> 	;   11) The 'u.fp' list as then searched to see what files
  1013                              <1> 	;	the parent has opened. For each file the parent has
  1014                              <1> 	;	opened, the corresponding 'fsp' entry must be updated
  1015                              <1> 	;	to indicate that the child process also has opened
  1016                              <1> 	;	the file. A branch to 'sysret' is then made.	 			 				
  1017                              <1> 	;
  1018                              <1> 	; Calling sequence:
  1019                              <1> 	;	from shell ?
  1020                              <1> 	; Arguments:
  1021                              <1> 	;	-
  1022                              <1> 	; Inputs: -
  1023                              <1> 	; Outputs: *u.r0 - child process name
  1024                              <1> 	; ...............................................................
  1025                              <1> 	;	
  1026                              <1> 	; Retro UNIX 8086 v1 modification: 
  1027                              <1> 	;	AX = r0 = PID (>0) (at the return of 'sysfork')
  1028                              <1> 	;	= process id of child a parent process returns
  1029                              <1> 	;	= process id of parent when a child process returns
  1030                              <1> 	;
  1031                              <1> 	;       In original UNIX v1, sysfork is called and returns as
  1032                              <1> 	;	in following manner: (with an example: c library, fork)
  1033                              <1> 	;	
  1034                              <1> 	;	1:
  1035                              <1> 	;		sys	fork
  1036                              <1> 	;			br 1f  / child process returns here
  1037                              <1> 	;		bes	2f     / parent process returns here
  1038                              <1> 	;		/ pid of new process in r0
  1039                              <1> 	;		rts	pc
  1040                              <1> 	;	2: / parent process condionally branches here
  1041                              <1> 	;		mov	$-1,r0 / pid = -1 means error return
  1042                              <1> 	;		rts	pc
  1043                              <1> 	;
  1044                              <1> 	;	1: / child process brances here
  1045                              <1> 	;		clr	r0   / pid = 0 in child process
  1046                              <1> 	;		rts	pc
  1047                              <1> 	;
  1048                              <1> 	;	In UNIX v7x86 (386) by Robert Nordier (1999)
  1049                              <1> 	;		// pid = fork();
  1050                              <1> 	;		//
  1051                              <1> 	;		// pid == 0 in child process; 
  1052                              <1> 	;		// pid == -1 means error return
  1053                              <1> 	;		// in child, 
  1054                              <1> 	;		//	parents id is in par_uid if needed
  1055                              <1> 	;		
  1056                              <1> 	;		_fork:
  1057                              <1> 	;			mov	$.fork,eax
  1058                              <1> 	;			int	$0x30
  1059                              <1> 	;			jmp	1f
  1060                              <1> 	;			jnc	2f
  1061                              <1> 	;			jmp	cerror
  1062                              <1> 	;		1:
  1063                              <1> 	;			mov	eax,_par_uid
  1064                              <1> 	;			xor	eax,eax
  1065                              <1> 	;		2:
  1066                              <1> 	;			ret
  1067                              <1> 	;
  1068                              <1> 	;	In Retro UNIX 8086 v1,
  1069                              <1> 	;	'sysfork' returns in following manner:
  1070                              <1> 	;	
  1071                              <1> 	;		mov	ax, sys_fork
  1072                              <1> 	;		mov	bx, offset @f ; routine for child
  1073                              <1> 	;		int	20h
  1074                              <1> 	;		jc	error
  1075                              <1> 	;		
  1076                              <1> 	;	; Routine for parent process here (just after 'jc')
  1077                              <1> 	;		mov	word ptr [pid_of_child], ax
  1078                              <1> 	;		jmp	next_routine_for_parent	
  1079                              <1> 	;
  1080                              <1> 	;	@@: ; routine for child process here				
  1081                              <1> 	;		....	
  1082                              <1> 	;	NOTE: 'sysfork' returns to specified offset
  1083                              <1> 	;	       for child process by using BX input.
  1084                              <1> 	;	      (at first, parent process will return then 
  1085                              <1> 	;	      child process will return -after swapped in-
  1086                              <1> 	;	      'syswait' is needed in parent process
  1087                              <1> 	;	      if return from child process will be waited for.)
  1088                              <1> 	;	  				
  1089                              <1> 	
  1090                              <1> ; / create a new process
  1091                              <1> 	; EBX = return address for child process 
  1092                              <1> 	     ; (Retro UNIX 8086 v1 modification !)
  1093 0000C75A 31F6                <1> 	xor 	esi, esi
  1094                              <1> 		; clr r1
  1095                              <1> sysfork_1: ; 1: / search p.stat table for unused process number
  1096 0000C75C 46                  <1> 	inc	esi
  1097                              <1> 		; inc r1
  1098 0000C75D 80BE[4B5A0100]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE, 05/02/2014
  1099                              <1> 		; tstb p.stat-1(r1) / is process active, unused, dead
  1100 0000C764 760B                <1> 	jna	short sysfork_2	
  1101                              <1> 		; beq 1f / it's unused so branch
  1102 0000C766 6683FE10            <1> 	cmp	si, nproc
  1103                              <1> 		; cmp r1,$nproc / all processes checked
  1104 0000C76A 72F0                <1> 	jb	short sysfork_1
  1105                              <1> 		; blt 1b / no, branch back
  1106                              <1> 	;
  1107                              <1> 	; Retro UNIX 8086 v1. modification:
  1108                              <1> 	;	Parent process returns from 'sysfork' to address 
  1109                              <1> 	;	which is just after 'sysfork' system call in parent
  1110                              <1> 	;	process. Child process returns to address which is put
  1111                              <1> 	;	in BX register by parent process for 'sysfork'. 
  1112                              <1> 	;
  1113                              <1> 		;add $2,18.(sp) / add 2 to pc when trap occured, points
  1114                              <1> 		             ; / to old process return
  1115                              <1> 		; br error1 / no room for a new process
  1116 0000C76C E97EFCFFFF          <1> 	jmp	error
  1117                              <1> sysfork_2: ; 1:
  1118 0000C771 E80384FFFF          <1> 	call	allocate_page
  1119 0000C776 0F8273FCFFFF        <1> 	jc	error
  1120 0000C77C 50                  <1> 	push	eax   ; UPAGE (user structure page) address
  1121                              <1> 	; Retro UNIX 386 v1 modification!
  1122 0000C77D E80686FFFF          <1> 	call	duplicate_page_dir
  1123                              <1> 		; EAX = New page directory 
  1124 0000C782 730B                <1> 	jnc	short sysfork_3
  1125 0000C784 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1126 0000C785 E8CD85FFFF          <1> 	call 	deallocate_page
  1127 0000C78A E960FCFFFF          <1> 	jmp	error
  1128                              <1> sysfork_3:
  1129                              <1> 	; Retro UNIX 386 v1 modification !
  1130 0000C78F 56                  <1> 	push	esi
  1131 0000C790 E8DC1E0000          <1> 	call	wswap ; save current user (u) structure, user registers
  1132                              <1> 		      ; and interrupt return components (for IRET)
  1133 0000C795 8705[545D0100]      <1> 	xchg	eax, [u.pgdir] ; page directory of the child process
  1134 0000C79B A3[585D0100]        <1> 	mov	[u.ppgdir], eax ; page directory of the parent process
  1135 0000C7A0 5E                  <1> 	pop	esi
  1136 0000C7A1 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1137                              <1> 		; [u.usp] = esp
  1138 0000C7A2 89F7                <1> 	mov	edi, esi
  1139 0000C7A4 66C1E702            <1> 	shl	di, 2
  1140 0000C7A8 8987[585A0100]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
  1141 0000C7AE A3[505D0100]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
  1142                              <1> 	; 28/08/2015
  1143 0000C7B3 0FB605[4F5D0100]    <1> 	movzx	eax, byte [u.uno] ; parent process number
  1144                              <1> 		; movb u.uno,-(sp) / save parent process number
  1145 0000C7BA 89C7                <1> 	mov	edi, eax
  1146 0000C7BC 50                  <1>         push	eax ; ** 
  1147 0000C7BD 8A87[1B5A0100]      <1> 	mov     al, [edi+p.ttyc-1] ; console tty (parent)
  1148                              <1> 	; 18/09/2015
  1149                              <1> 	;mov     [esi+p.ttyc-1], al ; set child's console tty
  1150                              <1> 	;mov     [esi+p.waitc-1], ah ; 0 ; reset child's wait channel
  1151 0000C7C3 668986[1B5A0100]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
  1152                              <1> 				   ; ah - reset child's wait channel	
  1153 0000C7CA 89F0                <1> 	mov	eax, esi
  1154 0000C7CC A2[4F5D0100]        <1> 	mov	[u.uno], al ; child process number
  1155                              <1> 		;movb r1,u.uno / set child process number to r1
  1156 0000C7D1 FE86[4B5A0100]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN, 05/02/2014
  1157                              <1> 		; incb p.stat-1(r1) / set p.stat entry for child 
  1158                              <1> 				; / process to active status
  1159                              <1> 		; mov u.ttyp,r2 / put pointer to parent process' 
  1160                              <1> 			      ; / control tty buffer in r2
  1161                              <1>                 ; beq 2f / branch, if no such tty assigned
  1162                              <1> 		; clrb 6(r2) / clear interrupt character in tty buffer
  1163                              <1> 	; 2:
  1164 0000C7D7 53                  <1> 	push	ebx  ; * return address for the child process
  1165                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1166                              <1> 	; (Retro UNIX 8086 v1 modification!)
  1167                              <1> 		; mov $runq+4,r2
  1168 0000C7D8 BB[F05C0100]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017  
  1169 0000C7DD E8FF1E0000          <1> 	call	putlu
  1170                              <1>  		; jsr r0,putlu / put child process on lowest priority 
  1171                              <1> 			   ; / run queue
  1172 0000C7E2 66D1E6              <1> 	shl	si, 1
  1173                              <1> 		; asl r1 / multiply r1 by 2 to get index 
  1174                              <1> 		       ; / into p.pid table
  1175 0000C7E5 66FF05[EA5C0100]    <1> 	inc	word [mpid]
  1176                              <1> 		; inc mpid / increment m.pid; get a new process name
  1177 0000C7EC 66A1[EA5C0100]      <1> 	mov	ax, [mpid]
  1178 0000C7F2 668986[BA590100]    <1> 	mov	[esi+p.pid-2], ax
  1179                              <1> 		;mov mpid,p.pid-2(r1) / put new process name 
  1180                              <1> 				    ; / in child process' name slot
  1181 0000C7F9 5A                  <1> 	pop	edx  ; * return address for the child process
  1182                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1183 0000C7FA 5B                  <1>   	pop	ebx  ; **
  1184                              <1> 	;mov	ebx, [esp] ; ** parent process number
  1185                              <1> 		; movb (sp),r2 / put parent process number in r2
  1186 0000C7FB 66D1E3              <1> 	shl 	bx, 1
  1187                              <1> 		;asl r2 / multiply by 2 to get index into below tables
  1188                              <1> 	;movzx eax, word [ebx+p.pid-2]
  1189 0000C7FE 668B83[BA590100]    <1> 	mov	ax, [ebx+p.pid-2]
  1190                              <1> 		; mov p.pid-2(r2),r2 / get process name of parent
  1191                              <1> 				   ; / process
  1192 0000C805 668986[DA590100]    <1> 	mov	[esi+p.ppid-2], ax
  1193                              <1> 		; mov r2,p.ppid-2(r1) / put parent process name 
  1194                              <1> 			  ; / in parent process slot for child
  1195 0000C80C A3[005D0100]        <1> 	mov	[u.r0], eax	
  1196                              <1> 		; mov r2,*u.r0 / put parent process name on stack 
  1197                              <1> 			     ; / at location where r0 was saved
  1198 0000C811 8B2D[F85C0100]      <1> 	mov 	ebp, [u.sp] ; points to return address (EIP for IRET)
  1199 0000C817 895500              <1> 	mov	[ebp], edx ; *, CS:EIP -> EIP
  1200                              <1> 			   ; * return address for the child process
  1201                              <1> 		; mov $sysret1,-(sp) /
  1202                              <1> 		; mov sp,u.usp / contents of sp at the time when 
  1203                              <1> 			      ; / user is swapped out
  1204                              <1> 		; mov $sstack,sp / point sp to swapping stack space
  1205                              <1> 	; 04/09/2015 - 01/09/2015
  1206                              <1> 	; [u.usp] = esp
  1207 0000C81A 68[0FC40000]        <1> 	push	sysret ; ***
  1208 0000C81F 8925[FC5C0100]      <1> 	mov	[u.usp], esp ; points to 'sysret' address (***)
  1209                              <1> 			     ; (for child process)	
  1210 0000C825 31C0                <1> 	xor 	eax, eax
  1211 0000C827 66A3[305D0100]      <1> 	mov 	[u.ttyp], ax ; 0
  1212                              <1> 	;
  1213 0000C82D E83F1E0000          <1> 	call	wswap ; Retro UNIX 8086 v1 modification !
  1214                              <1> 		;jsr r0,wswap / put child process out on drum
  1215                              <1> 		;jsr r0,unpack / unpack user stack
  1216                              <1> 		;mov u.usp,sp / restore user stack pointer
  1217                              <1> 		; tst (sp)+ / bump stack pointer
  1218                              <1> 	; Retro UNIX 386 v1 modification !
  1219 0000C832 58                  <1> 	pop	eax ; ***
  1220 0000C833 66D1E3              <1> 	shl	bx, 1
  1221 0000C836 8B83[585A0100]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address ; 14/05/2015
  1222 0000C83C E8681E0000          <1> 	call	rswap ; restore parent process 'u' structure, 
  1223                              <1> 		      ; registers and return address (for IRET)
  1224                              <1> 		;movb (sp)+,u.uno / put parent process number in u.uno
  1225 0000C841 0FB705[EA5C0100]    <1>         movzx   eax, word [mpid]
  1226 0000C848 A3[005D0100]        <1> 	mov	[u.r0], eax
  1227                              <1> 		; mov mpid,*u.r0 / put child process name on stack 
  1228                              <1> 			       ; / where r0 was saved
  1229                              <1> 		; add $2,18.(sp) / add 2 to pc on stack; gives parent
  1230                              <1> 			          ; / process return
  1231                              <1> 	;xor	ebx, ebx
  1232 0000C84D 31F6                <1> 	xor     esi, esi
  1233                              <1> 		;clr r1
  1234                              <1> sysfork_4: ; 1: / search u.fp list to find the files 
  1235                              <1> 	      ; / opened by the parent process
  1236                              <1> 	; 01/09/2015
  1237                              <1> 	;xor	bh, bh
  1238                              <1> 	;mov 	bl, [esi+u.fp]
  1239 0000C84F 8A86[065D0100]      <1> 	mov 	al, [esi+u.fp]
  1240                              <1> 		; movb u.fp(r1),r2 / get an open file for this process
  1241                              <1>         ;or      bl, bl
  1242 0000C855 08C0                <1> 	or	al, al
  1243 0000C857 740D                <1> 	jz	short sysfork_5	
  1244                              <1> 		; beq 2f / file has not been opened by parent, 
  1245                              <1> 		       ; / so branch
  1246 0000C859 B40A                <1> 	mov	ah, 10 ; Retro UNIX 386 v1 fsp structure size = 10 bytes
  1247 0000C85B F6E4                <1> 	mul	ah
  1248                              <1> 	;movzx	ebx, ax
  1249 0000C85D 6689C3              <1> 	mov	bx, ax
  1250                              <1> 	;shl     bx, 3
  1251                              <1> 		; asl r2 / multiply by 8
  1252                              <1>        		; asl r2 / to get index into fsp table
  1253                              <1>        		; asl r2
  1254 0000C860 FE83[EA5A0100]      <1>   	inc     byte [ebx+fsp-2]
  1255                              <1> 		; incb fsp-2(r2) / increment number of processes
  1256                              <1> 			     ; / using file, because child will now be
  1257                              <1> 			     ; / using this file
  1258                              <1> sysfork_5: ; 2:
  1259 0000C866 46                  <1>         inc     esi
  1260                              <1> 		; inc r1 / get next open file
  1261 0000C867 6683FE0A            <1>         cmp     si, 10
  1262                              <1> 		; cmp r1,$10. / 10. files is the maximum number which
  1263                              <1> 			  ; / can be opened
  1264 0000C86B 72E2                <1> 	jb	short sysfork_4	
  1265                              <1> 		; blt 1b / check next entry
  1266 0000C86D E99DFBFFFF          <1> 	jmp	sysret
  1267                              <1> 		; br sysret1
  1268                              <1> 
  1269                              <1> syscreat: ; < create file >
  1270                              <1> 	; 27/10/2016
  1271                              <1> 	; 25/10/2016, 26/10/2016
  1272                              <1> 	; 15/10/2016, 16/10/2016, 17/10/2016
  1273                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1274                              <1> 	;	     -derived from INT_21H.ASM-
  1275                              <1> 	;            ("loc_INT21h_create_file")
  1276                              <1>         ; 	10/07/2011 (12/03/2011)
  1277                              <1>         ;	INT 21h Function AH = 3Ch
  1278                              <1>         ;	Create File
  1279                              <1>         ;	INPUT
  1280                              <1>         ;	   CX = Attributes
  1281                              <1>         ;          DS:DX= Address of zero terminaned path name
  1282                              <1>         ;
  1283                              <1> 	; 27/12/2015 (Retro UNIX 386 v1.1)
  1284                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1285                              <1> 	; 27/05/2013 (Retro UNIX 8086 v1)
  1286                              <1> 	;
  1287                              <1> 	; 'syscreat' called with two arguments; name and mode.
  1288                              <1> 	; u.namep points to name of the file and mode is put
  1289                              <1> 	; on the stack. 'namei' is called to get i-number of the file.		
  1290                              <1> 	; If the file aready exists, it's mode and owner remain 
  1291                              <1> 	; unchanged, but it is truncated to zero length. If the file
  1292                              <1> 	; did not exist, an i-node is created with the new mode via
  1293                              <1> 	; 'maknod' whether or not the file already existed, it is
  1294                              <1> 	; open for writing. The fsp table is then searched for a free
  1295                              <1> 	; entry. When a free entry is found, proper data is placed
  1296                              <1> 	; in it and the number of this entry is put in the u.fp list.
  1297                              <1> 	; The index to the u.fp (also know as the file descriptor)
  1298                              <1> 	; is put in the user's r0. 			
  1299                              <1> 	;
  1300                              <1> 	; Calling sequence:
  1301                              <1> 	;	syscreate; name; mode
  1302                              <1> 	; Arguments:
  1303                              <1> 	;	name - name of the file to be created
  1304                              <1> 	;	mode - mode of the file to be created
  1305                              <1> 	; Inputs: (arguments)
  1306                              <1> 	; Outputs: *u.r0 - index to u.fp list 
  1307                              <1> 	;		   (the file descriptor of new file)
  1308                              <1> 	; ...............................................................
  1309                              <1> 	;				
  1310                              <1> 	; Retro UNIX 8086 v1 modification: 
  1311                              <1> 	;       'syscreate' system call has two arguments; so,
  1312                              <1> 	;	* 1st argument, name is pointed to by BX register
  1313                              <1> 	;	* 2nd argument, mode is in CX register
  1314                              <1> 	;
  1315                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1316                              <1> 	;	to the user with the file descriptor/number 
  1317                              <1> 	;	(index to u.fp list).
  1318                              <1> 	;
  1319                              <1> 	;call	arg2
  1320                              <1> 	; * name - 'u.namep' points to address of file/path name
  1321                              <1> 	;          in the user's program segment ('u.segmnt')
  1322                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1323                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1324                              <1> 	;          which is on top of stack.
  1325                              <1> 	;
  1326                              <1> 	; TRDOS 386 (10/10/2016)
  1327                              <1> 	;	
  1328                              <1>         ; INPUT ->
  1329                              <1>         ;	   CL = File Attributes
  1330                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1331                              <1> 	;             bit 1 (1) - Hidden file (H)
  1332                              <1>         ;             bit 2 (1) - System file (R)
  1333                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1334                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1335                              <1> 	;	      bit 5 (1) - File has been archived (A)	 	
  1336                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
  1337                              <1> 	;	
  1338                              <1> 	; OUTPUT ->
  1339                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1340                              <1> 	;          cf = 1 -> Error code in AL
  1341                              <1> 	;
  1342                              <1> 	; Modified Registers: EAX (at the return of system call)
  1343                              <1> 	;  
  1344                              <1> 	; Note: If the file is existing and it has not any one
  1345                              <1> 	;	of S,H,R,V,D attributes, it will be truncated 
  1346                              <1> 	;	to zero length; otherwise, access error will be 
  1347                              <1> 	;	returned. 
  1348                              <1> 
  1349                              <1> sysmkdir_0:
  1350 0000C872 F6C108              <1> 	test	cl, 08h ; Volume name 
  1351 0000C875 740A                <1> 	jz	short syscreat_0
  1352                              <1> 
  1353                              <1> 	; Volume name or long name creation
  1354                              <1> 	; is not permitted (in TRDOS 386)!
  1355 0000C877 B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1356 0000C87C E927020000          <1>         jmp	sysopen_dev_err
  1357                              <1> 
  1358                              <1> syscreat_0:
  1359                              <1>         ;mov	[u.namep], ebx
  1360 0000C881 51                  <1> 	push	ecx
  1361 0000C882 89DE                <1> 	mov	esi, ebx
  1362                              <1> 	; file name is forced, change directory as temporary
  1363                              <1> 	;mov	ax, 1
  1364                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1365                              <1> 	;call	set_working_path 
  1366 0000C884 E8652C0000          <1> 	call	set_working_path_x ; 17/10/2016	
  1367 0000C889 0F82D8000000        <1> 	jc	syscreat_err
  1368                              <1> 
  1369                              <1> 	; 16/10/2016
  1370 0000C88F 803D[9B4F0100]00    <1> 	cmp	byte [SWP_inv_fname], 0
  1371 0000C896 776D                <1> 	ja	short  syscreat_inv_fname ; invalid file name !
  1372                              <1> 
  1373                              <1> 	; Here, we have a valid path and also a valid file name
  1374                              <1> 	; (Working dir has been changed if the path
  1375                              <1> 	;  -file name string- had contained a dir name.)
  1376                              <1> 
  1377 0000C898 6631C0              <1> 	xor	ax, ax 
  1378                              <1> 	;mov	esi, FindFile_Name
  1379 0000C89B E8AFB6FFFF          <1> 	call	find_first_file
  1380 0000C8A0 59                  <1> 	pop	ecx
  1381                              <1> 		; ESI = Directory Entry (FindFile_DirEntry) Location
  1382                              <1> 		; EDI = Directory Buffer Directory Entry Location
  1383                              <1> 		; EAX = File Size
  1384                              <1> 		;  BL = Attributes of The File/Directory
  1385                              <1> 		;  BH = Long Name Yes/No Status (>0 is YES)
  1386                              <1> 		;  DX > 0 : Ambiguous filename chars are used
  1387 0000C8A1 726A                <1> 	jc	short syscreat_1 ; file not found (the good!) 
  1388                              <1> 				 ; or another error (the bad') 
  1389                              <1> 
  1390                              <1> 	; (& the uggly!) truncate file to zero length before open
  1391                              <1> 
  1392                              <1> 	;'*' and '?' already checked at 'set_working_path' stage
  1393                              <1> 	;and	dx, dx
  1394                              <1> 	;jnz	short sysmkdir_err ; permission denied 
  1395                              <1> 				   ; invalid filename chars
  1396                              <1> 
  1397                              <1> 	;test	cl, 10h ; subdirectory ?
  1398                              <1> 	;jnz	short sysmkdir_err	
  1399                              <1> 
  1400                              <1> 	; BL = File Attributes:	
  1401                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1402                              <1> 	;             bit 1 (1) - Hidden file (H)
  1403                              <1>         ;             bit 2 (1) - System file (R)
  1404                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1405                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1406                              <1> 	;	      bit 5 (1) - File has been archived	 	
  1407                              <1> 
  1408                              <1> 	; * existing directory must not be truncated
  1409                              <1> 	;   (we don't know it is empty or not, at this stage) 
  1410                              <1> 	; * existing volume name (or a long name) can not be
  1411                              <1> 	;   re-created or truncated by 'syscreat' 	
  1412                              <1> 	; * A file with S, H, R attributes must not be truncated
  1413                              <1> 	;   (change attributes to normal, if you need truncate it)
  1414                              <1> 
  1415 0000C8A3 F6C31F              <1> 	test	bl, 00011111b  ; check attributes of existing file
  1416 0000C8A6 754F                <1> 	jnz	short sysmkdir_err
  1417                              <1> 
  1418                              <1> 	;; normal file, OK to continue...
  1419                              <1> 
  1420                              <1> 	; ESI = FindFile_DirEntry
  1421 0000C8A8 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
  1422 0000C8AC 66C1E010            <1> 	shl	ax, 16
  1423 0000C8B0 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
  1424                              <1> 	; EAX = First cluster to be truncated/unlinked
  1425 0000C8B4 57                  <1> 	push	edi
  1426 0000C8B5 51                  <1> 	push	ecx
  1427 0000C8B6 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1428 0000C8BB 29C9                <1> 	sub	ecx, ecx
  1429 0000C8BD 8A2D[A6420100]      <1> 	mov	ch, [Current_Drv]
  1430 0000C8C3 01CE                <1> 	add	esi, ecx
  1431                              <1> 	; ESI = Logical dos drive description table address
  1432 0000C8C5 E8DDF7FFFF          <1> 	call	truncate_cluster_chain
  1433 0000C8CA 59                  <1> 	pop	ecx
  1434 0000C8CB 5F                  <1> 	pop	edi
  1435 0000C8CC 7230                <1> 	jc	short syscreate_truncate_err
  1436                              <1> 
  1437                              <1> 	; 26/10/2016
  1438                              <1> 	; EDI = Directory entry address in directory buffer
  1439                              <1> 	; Update directory entry
  1440 0000C8CE E859DCFFFF          <1> 	call	convert_current_date_time
  1441                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1442                              <1>         ; 	    AX = Time in dos dir entry format	
  1443 0000C8D3 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
  1444 0000C8D7 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
  1445 0000C8DB 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
  1446 0000C8DF 31C0                <1> 	xor	eax, eax ; file size = 0 
  1447 0000C8E1 89471C              <1> 	mov	[edi+DirEntry_FileSize], eax ; 0
  1448 0000C8E4 C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; data changed sign	
  1449 0000C8EB BE[9C4C0100]        <1> 	mov	esi, FindFile_DirEntry
  1450 0000C8F0 B201                <1> 	mov	dl, 1 ; open file for writing
  1451 0000C8F2 E9AA000000          <1> 	jmp	sysopen_2
  1452                              <1> 
  1453                              <1> sysmkdir_err:
  1454                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1455 0000C8F7 B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1456 0000C8FC EB73                <1>         jmp	short sysopen_err
  1457                              <1> 
  1458                              <1> syscreate_truncate_err:
  1459 0000C8FE B812000000          <1> 	mov	eax, ERR_DRV_WRITE ; 18 ; 'disk write error !'
  1460 0000C903 EB6C                <1>         jmp	short sysopen_err
  1461                              <1> 
  1462                              <1> syscreat_inv_fname:  ; invalid file name chars 
  1463                              <1> 	; 16/10/2016
  1464 0000C905 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26 ; invalid file name chars 
  1465 0000C90A 59                  <1> 	pop	ecx
  1466 0000C90B EB64                <1> 	jmp	sysopen_err
  1467                              <1> 
  1468                              <1> syscreat_1:
  1469                              <1> 	; Error code in EAX
  1470 0000C90D 3C02                <1>         cmp	al, 02h ; 'File not found' error
  1471 0000C90F 7560                <1>         jne	sysopen_err
  1472                              <1> 
  1473 0000C911 F6C110              <1> 	test	cl, 10h ; Directory
  1474 0000C914 0F852C020000        <1> 	jnz	sysmkdir_2
  1475                              <1> 
  1476                              <1> syscreat_2:
  1477 0000C91A BE[8C4C0100]        <1> 	mov	esi, FindFile_Name 
  1478                              <1>         ;xor	edx, edx
  1479 0000C91F 31C0                <1>         xor	eax, eax ; File Size  = 0
  1480 0000C921 31DB                <1> 	xor	ebx, ebx
  1481 0000C923 4B                  <1> 	dec 	ebx ; FFFFFFFFh -> create empty file 
  1482                              <1> 	            ;              (only for FAT fs) 
  1483                              <1> 	; CL = File Attributes
  1484 0000C924 E80CECFFFF          <1> 	call	create_file
  1485 0000C929 7246                <1> 	jc	sysopen_err
  1486                              <1> 		; EAX = New file's first cluster
  1487                              <1> 		; ESI = Logical Dos Drv Descr. Table Addr.
  1488                              <1> 		; EBX = offset CreateFile_Size
  1489                              <1> 		; ECX = Sectors per cluster (<256) 
  1490                              <1> 		; EDX = Directory entry index/number (<65536)
  1491                              <1> 	; 26/10/2016
  1492                              <1> 	;mov	esi, Directory_Buffer
  1493                              <1> 	;shl	dx, 5 ; *32
  1494                              <1> 	;add	esi, edx
  1495                              <1> 	;; esi = directory entry address in directory buffer
  1496                              <1> 
  1497                              <1> 	; Here, directory entry has been created but last
  1498                              <1> 	; modification date & time of the parent dir has not
  1499                              <1> 	; been updated, yet! 
  1500                              <1> 	; (Note: Directory and FAT buffers have been updated...)
  1501                              <1>  	
  1502 0000C92B E835DDFFFF          <1> 	call	update_parent_dir_lmdt ; now, it is OK too!
  1503                              <1> 
  1504                              <1> 	; 25/10/2016
  1505 0000C930 66B80018            <1> 	mov	ax, 1800h
  1506 0000C934 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name
  1507 0000C939 E811B6FFFF          <1> 	call	find_first_file
  1508 0000C93E 7231                <1> 	jc	short sysopen_err
  1509                              <1> 
  1510                              <1> 	; Only possible error after here is 
  1511                              <1> 	; "too many open files !" error.
  1512                              <1> 	;
  1513                              <1> 	; If "syscreat" will return with that error,
  1514                              <1> 	; (the file has been created but it could not be opened)
  1515                              <1> 	; the user must retry to open this file again
  1516                              <1> 	; or must close another file before using 
  1517                              <1> 	; "sysopen" system call.
  1518                              <1> 
  1519 0000C940 B201                <1> 	mov	dl, 1 ; open file for writing
  1520                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  1521                              <1> 	; EAX = File Size (= 0)
  1522 0000C942 EB5D                <1> 	jmp	short sysopen_2
  1523                              <1> 
  1524                              <1> sysopen: ;<open file>
  1525                              <1> 	; 26/10/2016
  1526                              <1> 	; 24/10/2016
  1527                              <1> 	; 17/10/2016
  1528                              <1> 	; 15/10/2016
  1529                              <1> 	; 06/10/2016, 07/10/2016, 08/10/2016
  1530                              <1> 	; 05/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1531                              <1> 	;	     -derived from INT_21H.ASM-
  1532                              <1> 	;            ("loc_INT21h_open_file")
  1533                              <1>         ; 	26/02/2011 
  1534                              <1>         ;	INT 21h Function AH = 3Dh
  1535                              <1>         ;	Open File
  1536                              <1>         ;	INPUT
  1537                              <1>         ;	   AL= File Access Value
  1538                              <1> 	;     	     0- Open for reading
  1539                              <1> 	;            1- Open for writing
  1540                              <1>         ;            2- Open for reading and writing
  1541                              <1>         ;          DS:DX= Pointer to filename (ASCIIZ)
  1542                              <1>         ;
  1543                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1544                              <1> 	; 22/05/2013 - 27/05/2013 (Retro UNIX 8086 v1)
  1545                              <1> 	;
  1546                              <1> 	; 'sysopen' opens a file in following manner:
  1547                              <1> 	;    1) The second argument in a sysopen says whether to
  1548                              <1> 	;	open the file ro read (0) or write (>0).
  1549                              <1> 	;    2) I-node of the particular file is obtained via 'namei'.
  1550                              <1> 	;    3) The file is opened by 'iopen'.
  1551                              <1> 	;    4) Next housekeeping is performed on the fsp table
  1552                              <1> 	;	and the user's open file list - u.fp.
  1553                              <1> 	;	a) u.fp and fsp are scanned for the next available slot.
  1554                              <1> 	;	b) An entry for the file is created in the fsp table.
  1555                              <1> 	;	c) The number of this entry is put on u.fp list.
  1556                              <1> 	;	d) The file descriptor index to u.fp list is pointed
  1557                              <1> 	;	   to by u.r0.
  1558                              <1> 	;
  1559                              <1> 	; Calling sequence:
  1560                              <1> 	;	sysopen; name; mode
  1561                              <1> 	; Arguments:
  1562                              <1> 	;	name - file name or path name
  1563                              <1> 	;	mode - 0 to open for reading
  1564                              <1> 	;	       1 to open for writing
  1565                              <1> 	; Inputs: (arguments)
  1566                              <1> 	; Outputs: *u.r0 - index to u.fp list (the file descriptor)
  1567                              <1> 	;		  is put into r0's location on the stack.	
  1568                              <1> 	; ...............................................................
  1569                              <1> 	;				
  1570                              <1> 	; Retro UNIX 8086 v1 modification: 
  1571                              <1> 	;       'sysopen' system call has two arguments; so,
  1572                              <1> 	;	* 1st argument, name is pointed to by BX register
  1573                              <1> 	;	* 2nd argument, mode is in CX register
  1574                              <1> 	;
  1575                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1576                              <1> 	;	to the user with the file descriptor/number 
  1577                              <1> 	;	(index to u.fp list).
  1578                              <1> 	;
  1579                              <1> 	;call	arg2
  1580                              <1> 	; * name - 'u.namep' points to address of file/path name
  1581                              <1> 	;          in the user's program segment ('u.segmnt')
  1582                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1583                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1584                              <1> 	;          which is on top of stack.
  1585                              <1> 	;
  1586                              <1> 	; jsr r0,arg2 / get sys args into u.namep and on stack
  1587                              <1> 	;
  1588                              <1>        	; system call registers: ebx, ecx (through 'sysenter')
  1589                              <1> 	;
  1590                              <1> 	; TRDOS 386 (05/10/2016)
  1591                              <1> 	;	
  1592                              <1>         ; INPUT ->
  1593                              <1>         ;	   CL = File Access Value (Open Mode)
  1594                              <1> 	;     	      0 - Open file for reading
  1595                              <1> 	;             1 - Open file for writing
  1596                              <1>         ;             2 - Open device for reading
  1597                              <1> 	;	      3 - Open device for writing
  1598                              <1>         ;          EBX = Pointer to filename/devicename (ASCIIZ)
  1599                              <1> 	; OUTPUT ->
  1600                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1601                              <1> 	;          cf = 1 -> Error code in AL
  1602                              <1> 	;
  1603                              <1> 	; Modified Registers: EAX (at the return of system call)
  1604                              <1> 	;  
  1605                              <1> 
  1606 0000C944 80F901              <1> 	cmp	cl, 1 ; read file (0), write file (1)
  1607 0000C947 7614                <1> 	jna	short sysopen_0
  1608                              <1> 
  1609 0000C949 80F903              <1> 	cmp	cl, 3
  1610 0000C94C 0F8640010000        <1> 	jna	sysopen_device
  1611                              <1> 
  1612                              <1> 	; Invalid access code
  1613 0000C952 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER
  1614 0000C957 0F874B010000        <1> 	ja	sysopen_dev_err
  1615                              <1> 
  1616                              <1> sysopen_0:
  1617                              <1> 	;mov	[u.namep], ebx
  1618 0000C95D 51                  <1> 	push	ecx
  1619 0000C95E 89DE                <1> 	mov	esi, ebx
  1620                              <1> 	; file name is forced, change directory as temporary
  1621                              <1> 	;mov	ax, 1
  1622                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1623                              <1> 	;call	set_working_path 
  1624 0000C960 E8892B0000          <1> 	call	set_working_path_x ; 17/10/2016	
  1625 0000C965 731E                <1> 	jnc	short sysopen_1
  1626                              <1> 
  1627                              <1> syscreat_err: ; ecx = file attributes (for 'syscreat')
  1628 0000C967 59                  <1> 	pop	ecx ; open mode  
  1629 0000C968 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  1630 0000C96A 7505                <1> 	jnz	short sysopen_err
  1631                              <1> 	; eax = 0
  1632 0000C96C B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  1633                              <1> sysopen_err:
  1634 0000C971 A3[005D0100]        <1> 	mov	[u.r0], eax
  1635 0000C976 A3[645D0100]        <1> 	mov	[u.error], eax
  1636 0000C97B E8432C0000          <1> 	call 	reset_working_path
  1637 0000C980 E96AFAFFFF          <1> 	jmp	error
  1638                              <1> 
  1639                              <1> sysopen_1:
  1640                              <1> 	;mov	esi, FindFile_Name
  1641 0000C985 66B80018            <1>         mov	ax, 1800h ; Only files 
  1642 0000C989 E8C1B5FFFF          <1> 	call	find_first_file
  1643 0000C98E 5A                  <1> 	pop	edx
  1644 0000C98F 72E0                <1> 	jc	short sysopen_err ; eax = 2 (File not found !)
  1645                              <1> 
  1646                              <1> 	; check_open_file_attr_access_code
  1647                              <1> 
  1648 0000C991 F6C307              <1>         test	bl, 7  ; system, hidden, readonly 
  1649 0000C994 740B                <1>         jz	short sysopen_2
  1650                              <1> 
  1651 0000C996 20D2                <1> 	and	dl, dl ; 0 = read mode
  1652 0000C998 7407                <1> 	jz	short sysopen_2
  1653                              <1> 
  1654                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1655 0000C99A B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11  = 'permission denied !'
  1656 0000C99F EBD0                <1>         jmp	short sysopen_err
  1657                              <1> 
  1658                              <1> sysopen_2:
  1659                              <1> 	; esi = Directory Entry (FindFile_DirEntry) Location
  1660 0000C9A1 89F3                <1> 	mov	ebx, esi
  1661 0000C9A3 31F6                <1>         xor     esi, esi ; 0
  1662 0000C9A5 31FF                <1>         xor     edi, edi ; 0
  1663                              <1> sysopen_3: ; scan the list of entries in fsp table
  1664 0000C9A7 80BE[065D0100]00    <1>         cmp     byte [esi+u.fp], 0
  1665 0000C9AE 760F                <1>         jna     short sysopen_4 ; empty slot
  1666 0000C9B0 6646                <1>         inc     si
  1667 0000C9B2 6683FE0A            <1>         cmp     si, 10
  1668 0000C9B6 72EF                <1> 	jb	short sysopen_3
  1669                              <1> toomanyf:
  1670 0000C9B8 B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1671 0000C9BD EBB2                <1> 	jmp	short sysopen_err
  1672                              <1> 
  1673                              <1> sysopen_4: 
  1674 0000C9BF 80BF[0A530100]00    <1>         cmp     byte [edi+OF_MODE], 0 ; Scan open files table 
  1675 0000C9C6 760A                <1> 	jna     short sysopen_5
  1676 0000C9C8 6647                <1> 	inc	di
  1677 0000C9CA 6683FF0A            <1> 	cmp     di, OPENFILES ; max. number of open files (=10)
  1678 0000C9CE 72EF                <1> 	jb	short sysopen_4
  1679 0000C9D0 EBE6                <1> 	jmp	short toomanyf
  1680                              <1> 
  1681                              <1> sysopen_5:
  1682 0000C9D2 FEC2                <1> 	inc	dl
  1683 0000C9D4 8897[0A530100]      <1>         mov     [edi+OF_MODE], dl
  1684 0000C9DA 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  1685 0000C9E0 8897[00530100]      <1>         mov     [edi+OF_DRIVE], dl ; Logical DOS drive number
  1686 0000C9E6 66C1E702            <1> 	shl	di, 2 ; *4 (dword offset)
  1687                              <1> 
  1688 0000C9EA 8987[50530100]      <1> 	mov	[edi+OF_SIZE], eax ; File size in bytes
  1689                              <1> 
  1690 0000C9F0 668B4314            <1>         mov 	ax, [ebx+DirEntry_FstClusHI]
  1691 0000C9F4 C1E010              <1> 	shl	eax, 16
  1692 0000C9F7 668B431A            <1> 	mov 	ax, [ebx+DirEntry_FstClusLO]
  1693 0000C9FB 8987[D8520100]      <1> 	mov     [edi+OF_FCLUSTER], eax ; First cluster
  1694 0000CA01 8987[F0530100]      <1> 	mov     [edi+OF_CCLUSTER], eax ; Current cluster
  1695                              <1> 
  1696 0000CA07 31DB                <1>         xor	ebx, ebx
  1697 0000CA09 899F[28530100]      <1>         mov     [edi+OF_POINTER], ebx ; offset pointer (0)
  1698 0000CA0F 899F[18540100]      <1>         mov     [edi+OF_CCINDEX], ebx ; cluster index (0)
  1699                              <1> 
  1700 0000CA15 A1[BC4C0100]        <1> 	mov	eax, [FindFile_DirFirstCluster]
  1701 0000CA1A 8987[78530100]      <1> 	mov	[edi+OF_DIRFCLUSTER], eax
  1702                              <1> 
  1703 0000CA20 A1[C04C0100]        <1> 	mov	eax, [FindFile_DirCluster]
  1704 0000CA25 8987[A0530100]      <1> 	mov	[edi+OF_DIRCLUSTER], eax
  1705                              <1> 
  1706                              <1> 	; Get (& Save) Volume ID 
  1707                              <1> 	; Important for files of removable drives
  1708                              <1> 	; (In order to check the drive has same volume/disk)
  1709 0000CA2B 88D7                <1> 	mov	bh, dl
  1710 0000CA2D 81C300010900        <1>         add	ebx, Logical_DOSDisks
  1711 0000CA33 8A4303              <1>         mov	al, [ebx+LD_FATType]
  1712 0000CA36 3C01                <1>         cmp	al, 1
  1713 0000CA38 7209                <1>         jb	short sysopen_6_fs
  1714 0000CA3A 3C02                <1>         cmp	al, 2
  1715 0000CA3C 770A                <1>         ja	short sysopen_6_fat32
  1716                              <1> sysopen_6_fat:
  1717 0000CA3E 8B432D              <1>         mov	eax, [ebx+LD_BPB+VolumeID]
  1718 0000CA41 EB08                <1>         jmp	short sysopen_7
  1719                              <1> sysopen_6_fs:
  1720 0000CA43 8B4328              <1>         mov	eax, [ebx+LD_FS_VolumeSerial]
  1721 0000CA46 EB03                <1>         jmp	short sysopen_7
  1722                              <1> sysopen_6_fat32:
  1723 0000CA48 8B4349              <1>         mov	eax, [ebx+LD_BPB+FAT32_VolID]
  1724                              <1> sysopen_7:
  1725 0000CA4B A3[9C420100]        <1>         mov	[Current_VolSerial], eax
  1726                              <1> 
  1727 0000CA50 8987[C8530100]      <1> 	mov	[edi+OF_VOLUMEID], eax
  1728                              <1> 
  1729                              <1> 	; 24/10/2016
  1730 0000CA56 66D1EF              <1> 	shr	di, 1 ; 4/2, word offset
  1731 0000CA59 668B1D[C44C0100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  1732 0000CA60 66899F[40540100]    <1> 	mov	[edi+OF_DIRENTRY], bx
  1733                              <1> 
  1734 0000CA67 31D2                <1> 	xor	edx, edx
  1735                              <1> 	;shr	di, 2 ; /4 (byte offset)
  1736 0000CA69 66D1EF              <1> 	shr	di, 1 ; 2/2, byte offset
  1737 0000CA6C 8897[1E530100]      <1> 	mov	byte [edi+OF_OPENCOUNT], dl ; 0
  1738 0000CA72 8897[14530100]      <1> 	mov	byte [edi+OF_STATUS], dl ; 0
  1739                              <1> 
  1740 0000CA78 89FB                <1> 	mov	ebx, edi
  1741 0000CA7A FEC3                <1> 	inc	bl
  1742                              <1> 
  1743 0000CA7C 889E[065D0100]      <1>         mov     [esi+u.fp], bl ; Open File Entry Number
  1744 0000CA82 8935[005D0100]      <1> 	mov     [u.r0], esi ; move index to u.fp list 
  1745                              <1> 			    ; into eax on stack
  1746                              <1> 
  1747 0000CA88 E8362B0000          <1>         call 	reset_working_path
  1748                              <1>         
  1749 0000CA8D E97DF9FFFF          <1> 	jmp	sysret
  1750                              <1> 
  1751                              <1> 	; (Retro UNIX 386 v1.0)
  1752                              <1> 	; 'fsp' table (10 bytes/entry)
  1753                              <1> 	; bit 15				   bit 0
  1754                              <1> 	; ---|-------------------------------------------
  1755                              <1> 	; r/w|		i-number of open file
  1756                              <1> 	; ---|-------------------------------------------
  1757                              <1> 	;		   device number
  1758                              <1> 	; -----------------------------------------------
  1759                              <1> 	; offset pointer, r/w pointer to file (bit 0-15)
  1760                              <1> 	; -----------------------------------------------
  1761                              <1> 	; offset pointer, r/w pointer to file (bit 16-31)
  1762                              <1> 	; ----------------------|------------------------
  1763                              <1> 	;  flag that says file 	| number of processes
  1764                              <1> 	;   has been deleted	| that have file open 
  1765                              <1> 	; ----------------------|------------------------
  1766                              <1> 
  1767                              <1> sysopen_device:
  1768                              <1> 	; 15/10/2016
  1769                              <1> 	; 08/10/2016
  1770                              <1> 	; 07/10/2016 (TRDOS 386 = TRDOS v2.0)
  1771 0000CA92 51                  <1> 	push	ecx ; open mode
  1772 0000CA93 89E5                <1> 	mov	ebp, esp
  1773 0000CA95 B910000000          <1> 	mov	ecx, 16 ; transfer length = 16 bytes 
  1774 0000CA9A 29CC                <1> 	sub	esp, ecx
  1775 0000CA9C 89E7                <1> 	mov	edi, esp ; destination address 
  1776 0000CA9E 89DE                <1> 	mov 	esi, ebx ; dev name in user's memory space
  1777 0000CAA0 E8711D0000          <1> 	call	transfer_from_user_buffer
  1778 0000CAA5 7310                <1> 	jnc	short sysopen_dev_0
  1779                              <1> 	; eax = ERR_OUT_OF_MEMORY = 4 = ERR_MINOR_IM
  1780 0000CAA7 59                  <1> 	pop	ecx
  1781                              <1> sysopen_dev_err:
  1782 0000CAA8 A3[005D0100]        <1> 	mov	[u.r0], eax
  1783 0000CAAD A3[645D0100]        <1> 	mov	[u.error], eax
  1784 0000CAB2 E938F9FFFF          <1> 	jmp	error
  1785                              <1> sysopen_dev_0:
  1786 0000CAB7 89FE                <1> 	mov	esi, edi ; Device name addr (max. 16 bytes, ASCIIZ) 
  1787                              <1> 			 ; for example: "tty, TTY, /dev/tty"
  1788 0000CAB9 E8AD2D0000          <1> 	call	get_device_number
  1789 0000CABE 89EC                <1> 	mov	esp, ebp
  1790 0000CAC0 59                  <1> 	pop	ecx
  1791 0000CAC1 7307                <1> 	jnc	short sysopen_dev_1
  1792 0000CAC3 B818000000          <1> 	mov	eax, ERR_INV_DEV_NAME ; 24 ; 'invalid device name !'
  1793 0000CAC8 EBDE                <1> 	jmp	short sysopen_dev_err
  1794                              <1> sysopen_dev_1:
  1795                              <1> 	; eax = Device Number (AL)
  1796                              <1> 	;  cl = Open mode (2 = device read, 3 = device write)
  1797 0000CACA 31DB                <1>         xor     ebx, ebx ; 0
  1798                              <1> sysopen_dev_2: ; scan the list of entries
  1799 0000CACC 389B[065D0100]      <1>         cmp     [ebx+u.fp], bl ; 0
  1800 0000CAD2 760E                <1>         jna     short sysopen_dev_3 ; empty slot
  1801 0000CAD4 FEC3                <1>         inc     bl
  1802 0000CAD6 80FB0A              <1>         cmp     bl, 10
  1803 0000CAD9 72F1                <1> 	jb	short sysopen_dev_2
  1804                              <1> 	;
  1805 0000CADB B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1806 0000CAE0 EBC6                <1> 	jmp	short sysopen_dev_err
  1807                              <1> sysopen_dev_3:
  1808 0000CAE2 891D[005D0100]      <1> 	mov 	[u.r0], ebx ; File/Device index/handle/descriptor
  1809                              <1> 	; eax = device number (entry offset)
  1810 0000CAE8 8AA8[9C500100]      <1> 	mov	ch, [eax+DEV_ACCESS] ; bit 0 = accessable by users
  1811                              <1> 				     ; bit 1 = read access perm
  1812                              <1> 				     ; bit 2 = write access perm
  1813                              <1> 				     ; bit 3 = IOCTL permit to users
  1814                              <1> 				     ; bit 4 = block device if set
  1815                              <1> 				     ; bit 5 = 16 bit or 1024 byte
  1816                              <1> 				     ; bit 6 = 32 bit or 2048 byte
  1817                              <1> 				     ; bit 7 = installable device drv
  1818 0000CAEE F6C501              <1> 	test 	ch, 1 ; accessable by normal users (except root)
  1819 0000CAF1 7510                <1> 	jnz	short sysopen_dev_4 ; yes, permission has been given
  1820 0000CAF3 803D[4C5D0100]00    <1> 	cmp	byte [u.uid], 0 ; root?
  1821 0000CAFA 7607                <1> 	jna	short sysopen_dev_4 ; superuser can open all devices
  1822                              <1> sysopen_dev_perm_err:
  1823 0000CAFC B80B000000          <1> 	mov	eax, ERR_DEV_ACCESS  ; 11  = 'permission denied !'
  1824 0000CB01 EBA5                <1> 	jmp	short sysopen_dev_err
  1825                              <1> sysopen_dev_4:
  1826 0000CB03 D0ED                <1> 	shr	ch, 1 ; result: 1 = read, 2 = write, 3 = r & w 
  1827 0000CB05 FEC9                <1> 	dec	cl  ; result: 1 = read, 2 = write
  1828 0000CB07 84E9                <1> 	test	cl, ch
  1829 0000CB09 74F1                <1> 	jz	short sysopen_dev_perm_err 
  1830                              <1> 
  1831 0000CB0B D0E5                <1> 	shl	ch, 1 ; bit 0 = 0
  1832                              <1> 	; eax = device number (entry offset)
  1833 0000CB0D E8752E0000          <1> 	call	device_open
  1834 0000CB12 72E8                <1> 	jc	short sysopen_dev_perm_err 
  1835                              <1> 
  1836                              <1> 	; eax = device number (entry offset)
  1837 0000CB14 0C80                <1> 	or	al, 80h ; set device bit (set bit 7 to 1)
  1838 0000CB16 8B1D[005D0100]      <1> 	mov	ebx, [u.r0]
  1839 0000CB1C 8883[065D0100]      <1> 	mov	[ebx+u.fp], al	; bit 7 (=1) points to device	
  1840                              <1> 	
  1841 0000CB22 E9E8F8FFFF          <1> 	jmp	sysret
  1842                              <1> 
  1843                              <1> sysmkdir: ; < make directory >
  1844                              <1> 	; 15/10/2016
  1845                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1846                              <1> 	;	     -derived from INT_21H.ASM-
  1847                              <1> 	;            ("loc_INT21h_create_file")
  1848                              <1>         ; 	10/07/2011 (12/03/2011)
  1849                              <1>         ;	INT 21h Function AH = 3Ch
  1850                              <1>         ;	Create File
  1851                              <1>         ;	INPUT
  1852                              <1>         ;	   CX = Attributes
  1853                              <1>         ;          DS:DX= Address of zero terminaned path name
  1854                              <1>         ;
  1855                              <1>         ;
  1856                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1857                              <1> 	; 27/05/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  1858                              <1> 	;
  1859                              <1> 	; 'sysmkdir' creates an empty directory whose name is
  1860                              <1> 	; pointed to by arg 1. The mode of the directory is arg 2.	
  1861                              <1> 	; The special entries '.' and '..' are not present.
  1862                              <1> 	; Errors are indicated if the directory already exists or		
  1863                              <1> 	; user is not the super user. 
  1864                              <1> 	;
  1865                              <1> 	; Calling sequence:
  1866                              <1> 	;	sysmkdir; name; mode
  1867                              <1> 	; Arguments:
  1868                              <1> 	;	name - points to the name of the directory
  1869                              <1> 	;	mode - mode of the directory
  1870                              <1> 	; Inputs: (arguments)
  1871                              <1> 	; Outputs: -
  1872                              <1> 	;    (sets 'directory' flag to 1; 
  1873                              <1> 	;    'set user id on execution' and 'executable' flags to 0)
  1874                              <1> 	; ...............................................................
  1875                              <1> 	;				
  1876                              <1> 	; Retro UNIX 8086 v1 modification: 
  1877                              <1> 	;       'sysmkdir' system call has two arguments; so,
  1878                              <1> 	;	* 1st argument, name is pointed to by BX register
  1879                              <1> 	;	* 2nd argument, mode is in CX register
  1880                              <1> 	;
  1881                              <1> 	; TRDOS 386 (10/10/2016)
  1882                              <1> 	;	
  1883                              <1>         ; INPUT ->
  1884                              <1>         ;	   CL = Directory Attributes
  1885                              <1> 	;     	      bit 0 (1) - Read only file/dir (R)
  1886                              <1> 	;             bit 1 (1) - Hidden file/dir (H)
  1887                              <1>         ;             bit 2 (1) - System file/dir (R)
  1888                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1889                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1890                              <1> 	;	      bit 5 (1) - File/Dir has been archived (A)
  1891                              <1> 	;	   CX = 0 -> create normal directory	 	
  1892                              <1>         ;          EBX = Pointer to directory name (ASCIIZ) -path-
  1893                              <1> 	;	
  1894                              <1> 	; OUTPUT ->
  1895                              <1> 	;          eax = First cluster of the new directory
  1896                              <1> 	;          cf = 1 -> Error code in AL
  1897                              <1> 	;
  1898                              <1> 	; Modified Registers: EAX (at the return of system call)
  1899                              <1> 	;  
  1900                              <1> 	; Note: If the file or directory is existing
  1901                              <1> 	;	an access error will be returned. 
  1902                              <1> 
  1903 0000CB27 6621C9              <1> 	and	cx, cx ; if cx = 0 -> create a normal subdir
  1904 0000CB2A 7413                <1> 	jz	short sysmkdir_1
  1905                              <1> 
  1906 0000CB2C F6C110              <1> 	test	cl, 10h ; if dir flags set, also use other flags
  1907 0000CB2F 0F853DFDFFFF        <1> 	jnz	sysmkdir_0 ; jump to head of 'syscreat'
  1908                              <1> 
  1909                              <1> 	; CX has wrong flags
  1910 0000CB35 B817000000          <1> 	mov 	eax, ERR_INV_FLAGS
  1911 0000CB3A E969FFFFFF          <1> 	jmp	sysopen_dev_err
  1912                              <1> 
  1913                              <1> sysmkdir_1:
  1914 0000CB3F B110                <1> 	mov	cl, 10h ; set subdir flag and reset other flags
  1915 0000CB41 E92CFDFFFF          <1> 	jmp	sysmkdir_0 ; jump to head of 'syscreat'
  1916                              <1> sysmkdir_2: 
  1917                              <1> 	; jump from 'syscreat' ; from 'syscreat_1'
  1918                              <1> 	;  CL = Directory attributes/flags  
  1919 0000CB46 BE[8C4C0100]        <1> 	mov	esi, FindFile_Name 
  1920 0000CB4B E815D7FFFF          <1> 	call	make_sub_directory
  1921 0000CB50 0F821BFEFFFF        <1> 	jc	sysopen_err       ; NOTE: Old type (TRDOS 8086)
  1922                              <1> 				  ; error codes must be modified
  1923                              <1> 				  ; for next TRDOS 386 versions
  1924                              <1> 				  ; (10/10/2016)
  1925                              <1> 				  ; Old (MSDOS type)
  1926                              <1> 				  ; error codes (2011):
  1927                              <1> 				  ;  2 = file not found
  1928                              <1> 				  ;  3 = directory not found
  1929                              <1> 				  ;  5 = access denied
  1930                              <1> 				  ; 12 = no more files
  1931                              <1> 			          ; 19 = disk write protected   
  1932                              <1> 				  ; 39 = insufficient disk space
  1933                              <1> 				  ; 'sysdefs.s' ; 10/10/2016  	
  1934                              <1> 	
  1935 0000CB56 A3[005D0100]        <1> 	mov	[u.r0], eax ; New sub dir's first cluster
  1936                              <1> 
  1937 0000CB5B E8632A0000          <1>         call 	reset_working_path
  1938                              <1> 
  1939 0000CB60 E9AAF8FFFF          <1> 	jmp	sysret	
  1940                              <1> 
  1941                              <1> sysclose: ;<close file>
  1942                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1943                              <1> 	;
  1944                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1945                              <1> 	; 22/05/2013 - 26/05/2013 (Retro UNIX 8086 v1)
  1946                              <1> 	;
  1947                              <1> 	; 'sysclose', given a file descriptor in 'u.r0', closes the
  1948                              <1> 	; associated file. The file descriptor (index to 'u.fp' list)
  1949                              <1> 	; is put in r1 and 'fclose' is called.
  1950                              <1> 	;
  1951                              <1> 	; Calling sequence:
  1952                              <1> 	;	sysclose
  1953                              <1> 	; Arguments:
  1954                              <1> 	;	-  
  1955                              <1> 	; Inputs: *u.r0 - file descriptor
  1956                              <1> 	; Outputs: -
  1957                              <1> 	; ...............................................................
  1958                              <1> 	;				
  1959                              <1> 	; Retro UNIX 8086 v1 modification:
  1960                              <1> 	;	 The user/application program puts file descriptor
  1961                              <1> 	;        in BX register as 'sysclose' system call argument.
  1962                              <1> 	; 	 (argument transfer method 1)
  1963                              <1> 
  1964                              <1> 	; TRDOS 386 (06/10/2016)
  1965                              <1> 	;	
  1966                              <1>         ; INPUT ->
  1967                              <1>         ;	   EBX = File Handle/Number (file index) (AL)
  1968                              <1> 	; OUTPUT ->
  1969                              <1> 	;          cf = 0 -> EAX = 0
  1970                              <1> 	;          cf = 1 -> Error code in EAX (ERR_FILE_NOT_OPEN)
  1971                              <1> 	;
  1972                              <1> 	; Modified Registers: EAX (at the return of system call)
  1973                              <1> 	;  
  1974                              <1> 
  1975 0000CB65 89D8                <1> 	mov 	eax, ebx
  1976 0000CB67 31DB                <1> 	xor	ebx, ebx	
  1977 0000CB69 891D[005D0100]      <1> 	mov	[u.r0], ebx ; 0  ; return value of EAX
  1978 0000CB6F E88B0E0000          <1> 	call 	fclose
  1979 0000CB74 0F8395F8FFFF        <1> 	jnc	sysret
  1980 0000CB7A B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  1981 0000CB7F A3[645D0100]        <1> 	mov	[u.error], eax ;
  1982 0000CB84 A3[005D0100]        <1> 	mov	[u.r0], eax ; ! invalid handle !
  1983 0000CB89 E961F8FFFF          <1> 	jmp	error
  1984                              <1> 
  1985                              <1> sysread: ; < read from file >
  1986                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1987                              <1> 	;	     -derived from INT_21H.ASM-
  1988                              <1> 	;            ("loc_INT21h_read_file")
  1989                              <1>         ; 	13/03/2011 (05/03/2011)
  1990                              <1>         ;	INT 21h Function AH = 3Fh
  1991                              <1>         ;	Read from a File
  1992                              <1>         ;	INPUT
  1993                              <1> 	;	   BX = File Handle
  1994                              <1>         ;	   CX = Number of bytes to read
  1995                              <1>         ;          DS:DX= Buffer address
  1996                              <1>         ;
  1997                              <1> 	; Note: TRDOS 386 'sysread' has been derived from 
  1998                              <1> 	;	Retro UNIX 386 v1 'sysread', except a few 
  1999                              <1> 	;	code modifications.
  2000                              <1> 	;
  2001                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  2002                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2003                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  2004                              <1> 	;
  2005                              <1> 	; 'sysread' is given a buffer to read into and the number of
  2006                              <1> 	; characters to be read. If finds the file from the file
  2007                              <1> 	; descriptor located in *u.r0 (r0). This file descriptor
  2008                              <1> 	; is returned from a successful open call (sysopen).
  2009                              <1> 	; The i-number of file is obtained via 'rw1' and the data
  2010                              <1> 	; is read into core via 'readi'.
  2011                              <1> 	;
  2012                              <1> 	; Calling sequence:
  2013                              <1> 	;	sysread; buffer; nchars
  2014                              <1> 	; Arguments:
  2015                              <1> 	;	buffer - location of contiguous bytes where 
  2016                              <1> 	;		 input will be placed.
  2017                              <1> 	;	nchars - number of bytes or characters to be read.
  2018                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  2019                              <1> 	; Outputs: *u.r0 - number of bytes read.	
  2020                              <1> 	; ...............................................................
  2021                              <1> 	;				
  2022                              <1> 	; Retro UNIX 8086 v1 modification: 
  2023                              <1> 	;       'sysread' system call has three arguments; so,
  2024                              <1> 	;	* 1st argument, file descriptor is in BX register
  2025                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  2026                              <1> 	;	* 3rd argument, number of bytes is in DX register
  2027                              <1> 	;
  2028                              <1> 	;	AX register (will be restored via 'u.r0') will return
  2029                              <1> 	;	to the user with number of bytes read. 
  2030                              <1> 	;
  2031                              <1> 	; TRDOS 386 (05/10/2016)
  2032                              <1> 	;	
  2033                              <1>         ; INPUT ->
  2034                              <1>         ;	   EBX = File handle (descriptor/index)
  2035                              <1> 	;	   ECX = Buffer address		
  2036                              <1>         ;          EDX = Number of bytes
  2037                              <1> 	; OUTPUT ->
  2038                              <1> 	;          EAX = Number of bytes have been read
  2039                              <1> 	;          cf = 1 -> Error code in AL
  2040                              <1> 	;
  2041                              <1> 	; Modified Registers: EAX (at the return of system call)
  2042                              <1> 	; 
  2043                              <1> 
  2044                              <1> 	; EBX = File descriptor
  2045 0000CB8E E8BA0E0000          <1> 	call	getf1 
  2046 0000CB93 7277                <1> 	jc	short device_read ; read data from device
  2047                              <1> 	; EAX = First cluster of the file
  2048                              <1> 
  2049 0000CB95 E83F000000          <1> 	call	rw1
  2050 0000CB9A 730A                <1> 	jnc	short sysread_0
  2051                              <1> 
  2052 0000CB9C A3[005D0100]        <1> 	mov	[u.r0], eax ; error code
  2053 0000CBA1 E949F8FFFF          <1> 	jmp	error
  2054                              <1> 	 
  2055                              <1> sysread_0:
  2056 0000CBA6 E848170000          <1> 	call	readi
  2057 0000CBAB EB1D                <1> 	jmp	short rw0
  2058                              <1> 
  2059                              <1> syswrite: ; < write to file >
  2060                              <1> 	; 23/10/2016
  2061                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2062                              <1> 	;	     -derived from INT_21H.ASM-
  2063                              <1> 	;            ("loc_INT21h_write_file")
  2064                              <1>         ; 	13/03/2011 (05/03/2011)
  2065                              <1>         ;	INT 21h Function AH = 40h
  2066                              <1>         ;	Write to a File
  2067                              <1>         ;	INPUT
  2068                              <1> 	;	   BX = File Handle
  2069                              <1>         ;	   CX = Number of bytes to write
  2070                              <1>         ;          DS:DX= Buffer address
  2071                              <1>         ;
  2072                              <1> 	; Note: TRDOS 386 'sysrwrite' has been derived from 
  2073                              <1> 	;	Retro UNIX 386 v1 'syswrite', except a few 
  2074                              <1> 	;	code modifications.
  2075                              <1> 	;
  2076                              <1> 
  2077                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  2078                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2079                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  2080                              <1> 	;
  2081                              <1> 	; 'syswrite' is given a buffer to write onto an output file
  2082                              <1> 	; and the number of characters to write. If finds the file
  2083                              <1> 	; from the file descriptor located in *u.r0 (r0). This file 
  2084                              <1> 	; descriptor is returned from a successful open or create call
  2085                              <1> 	; (sysopen or syscreat). The i-number of file is obtained via
  2086                              <1> 	; 'rw1' and buffer is written on the output file via 'write'.
  2087                              <1> 	;
  2088                              <1> 	; Calling sequence:
  2089                              <1> 	;	syswrite; buffer; nchars
  2090                              <1> 	; Arguments:
  2091                              <1> 	;	buffer - location of contiguous bytes to be writtten.
  2092                              <1> 	;	nchars - number of characters to be written.
  2093                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  2094                              <1> 	; Outputs: *u.r0 - number of bytes written.	
  2095                              <1> 	; ...............................................................
  2096                              <1> 	;				
  2097                              <1> 	; Retro UNIX 8086 v1 modification: 
  2098                              <1> 	;       'syswrite' system call has three arguments; so,
  2099                              <1> 	;	* 1st argument, file descriptor is in BX register
  2100                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  2101                              <1> 	;	* 3rd argument, number of bytes is in DX register
  2102                              <1> 	;
  2103                              <1> 	;	AX register (will be restored via 'u.r0') will return
  2104                              <1> 	;	to the user with number of bytes written. 
  2105                              <1> 	;
  2106                              <1> 	; INPUT ->
  2107                              <1>         ;	   EBX = File handle (descriptor/index)
  2108                              <1> 	;	   ECX = Buffer address		
  2109                              <1>         ;          EDX = Number of bytes
  2110                              <1> 	; OUTPUT ->
  2111                              <1> 	;          EAX = Number of bytes have been written
  2112                              <1> 	;          cf = 1 -> Error code in AL
  2113                              <1> 	;
  2114                              <1> 	; Modified Registers: EAX (at the return of system call)
  2115                              <1> 	;  
  2116                              <1> 
  2117                              <1> 	; EBX = File descriptor
  2118 0000CBAD E89B0E0000          <1> 	call	getf1 
  2119 0000CBB2 7274                <1> 	jc	short device_write ; write data to device
  2120                              <1> 	; EAX = First cluster of the file
  2121                              <1> 	; EBX = File number  (Open file number) ; 23/10/2016
  2122                              <1> 
  2123 0000CBB4 E820000000          <1> 	call	rw1
  2124 0000CBB9 730A                <1> 	jnc	short syswrite_0
  2125 0000CBBB A3[005D0100]        <1> 	mov	[u.r0], eax ; error code
  2126 0000CBC0 E92AF8FFFF          <1> 	jmp	error
  2127                              <1> 	 
  2128                              <1> syswrite_0:
  2129 0000CBC5 E8641E0000          <1> 	call	writei
  2130                              <1> rw0: ; 1:
  2131 0000CBCA A1[285D0100]        <1>         mov	eax, [u.nread]
  2132 0000CBCF A3[005D0100]        <1> 	mov	[u.r0], eax
  2133 0000CBD4 E936F8FFFF          <1> 	jmp	sysret
  2134                              <1> 
  2135                              <1> rw1:	
  2136                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2137                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2138                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2139                              <1> 	; 23/05/2013 - 24/05/2013 (Retro UNIX 8086 v1)
  2140                              <1> 	; System call registers: ebx, ecx, edx (through 'sysenter')
  2141                              <1> 	;
  2142                              <1> 	; EBX = File descriptor
  2143                              <1> 	;call	getf1 ; calling point in 'getf' from 'rw1'
  2144                              <1> 	;jc	short device_rw ; read/write data from/to device
  2145                              <1> 	; EAX = First cluster of the file
  2146                              <1> 
  2147 0000CBD9 83F802              <1> 	cmp 	eax, 2
  2148 0000CBDC 7217                <1> 	jb	short rw2
  2149                              <1> 	;
  2150 0000CBDE 890D[205D0100]      <1> 	mov	[u.base], ecx 	; buffer address/offset 
  2151                              <1> 				;(in the user's virtual memory space)
  2152 0000CBE4 8915[245D0100]      <1> 	mov	[u.count], edx 
  2153                              <1> 
  2154 0000CBEA C705[645D0100]0000- <1>         mov     dword [u.error], 0 ; reset the last error code
  2154 0000CBF2 0000                <1>
  2155 0000CBF4 C3                  <1> 	retn
  2156                              <1> 
  2157                              <1> rw2:
  2158 0000CBF5 B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  2159 0000CBFA A3[645D0100]        <1> 	mov	dword [u.error], eax
  2160 0000CBFF C3                  <1> 	retn
  2161                              <1> rw3: 
  2162 0000CC00 B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS ; permission denied !
  2163 0000CC05 A3[645D0100]        <1> 	mov	dword [u.error], eax
  2164 0000CC0A F9                  <1> 	stc
  2165 0000CC0B C3                  <1> 	retn
  2166                              <1> 
  2167                              <1> device_read:
  2168                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2169                              <1> 	; cl = DEV_OPENMODE ; open mode
  2170                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2171                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2172                              <1> 
  2173 0000CC0C F6C101              <1> 	test	cl, 1 ; 1 = read, 2 = write, 3 = read&write
  2174 0000CC0F 74EF                <1> 	jz	short rw3
  2175                              <1> 
  2176 0000CC11 89C3                <1> 	mov	ebx, eax
  2177 0000CC13 66C1E302            <1> 	shl	bx, 2 ; *4
  2178                              <1> 
  2179 0000CC17 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2180 0000CC1A 7406                <1> 	jz	short d_read_2 ; Kernel device
  2181                              <1> 	; installable device
  2182                              <1> d_read_1:
  2183 0000CC1C FFA3[58500100]      <1>         jmp	dword [ebx+IDEV_RADDR-4]
  2184                              <1> d_read_2:
  2185 0000CC22 FFA3[60070100]      <1> 	jmp	dword [ebx+KDEV_RADDR-4]
  2186                              <1> 
  2187                              <1> device_write:
  2188                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2189                              <1> 	; cl = DEV_OPENMODE ; open mode
  2190                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2191                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2192                              <1> 
  2193 0000CC28 F6C102              <1> 	test	cl, 2 ; 1 = read, 2 = write, 3 = read&write
  2194 0000CC2B 74D3                <1> 	jz	short rw3	
  2195                              <1> 
  2196 0000CC2D 89C3                <1> 	mov	ebx, eax
  2197 0000CC2F 66C1E302            <1> 	shl	bx, 2 ; *4
  2198                              <1> 
  2199 0000CC33 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2200 0000CC36 7406                <1> 	jz	short d_write_2 ; Kernel device
  2201                              <1> 	; installable device
  2202                              <1> d_write_1:
  2203 0000CC38 FFA3[78500100]      <1>         jmp	dword [ebx+IDEV_WADDR-4]
  2204                              <1> d_write_2:
  2205 0000CC3E FFA3[B0070100]      <1> 	jmp	dword [ebx+KDEV_WADDR-4]
  2206                              <1> 
  2207                              <1> 
  2208                              <1> sysemt: ; enable (or disable) multi tasking -time sharing-
  2209                              <1> 	;
  2210                              <1> 	; 23/05/2016 - TRDOS 386 (TRDOS v2.0)
  2211                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2212                              <1> 	; 10/12/2013 - 20/04/2014 (Retro UNIX 8086 v1)
  2213                              <1> 	;
  2214                              <1> 	; Retro UNIX 8086 v1 modification: 
  2215                              <1> 	;	'Enable Multi Tasking'  system call instead 
  2216                              <1> 	;	of 'Emulator Trap' in original UNIX v1 for PDP-11.
  2217                              <1> 	;
  2218                              <1> 	; Retro UNIX 8086 v1 feature only!
  2219                              <1> 	;	Using purpose: Kernel will start without time-out
  2220                              <1> 	;	(internal clock/timer) functionality.
  2221                              <1> 	;	Then etc/init will enable clock/timer for
  2222                              <1> 	;	multi tasking. 
  2223                              <1> 	;
  2224                              <1> 	; INPUT ->
  2225                              <1> 	;	BL = 0 -> disable multi tasking
  2226                              <1> 	;	BL > 1 -> enable multi tasking (time sharing) 
  2227                              <1> 	; OUTPUT ->
  2228                              <1> 	;	none	
  2229                              <1> 	;
  2230                              <1> 	;  Note: Multi tasking is disabled during system
  2231                              <1> 	;	 initialization, it must be enabled by using
  2232                              <1> 	;	 this system call. (Otherwise, running proces 
  2233                              <1> 	;	 will not be changed by another process within
  2234                              <1> 	;	 run time sequence/schedule, if running process
  2235                              <1> 	;	 will not 'release' itself. Only 'wakeup' procedure
  2236                              <1> 	;	 for waiting processes and programmed timer events
  2237                              <1> 	;	 for other processes can change running process 
  2238                              <1> 	;	 while multi tasking is disabled.) ** 23/05/2016 **
  2239                              <1> 
  2240 0000CC44 803D[4C5D0100]00    <1> 	cmp	byte [u.uid], 0 ; root ?
  2241                              <1> 	;ja	error
  2242 0000CC4B 0F87E3F8FFFF        <1> 	ja	badsys ; 14/05/2015
  2243                              <1> 	;
  2244 0000CC51 FA                  <1> 	cli
  2245 0000CC52 881D[764F0100]      <1> 	mov	[multi_tasking], bl ; 0 to disable, >0 to enable
  2246 0000CC58 E9B2F7FFFF          <1> 	jmp	sysret
  2247                              <1> 
  2248                              <1> systimer:
  2249                              <1> 	; 02/01/2017
  2250                              <1> 	; 21/12/2016
  2251                              <1> 	; 19/12/2016
  2252                              <1> 	; 10/12/2016 (callback)
  2253                              <1> 	; 10/06/2016
  2254                              <1> 	; 07/06/2016
  2255                              <1> 	; 06/06/2016
  2256                              <1> 	; 21/05/2016
  2257                              <1> 	; 19/05/2016
  2258                              <1> 	; 18/05/2016 - TRDOS 386 (TRDOS v2.0)
  2259                              <1> 	; (TRDOS 386 feature only!)
  2260                              <1> 	;
  2261                              <1> 	; (start or stop timer event(s))	
  2262                              <1> 	;
  2263                              <1> 	; INPUT ->
  2264                              <1> 	;	BL = Signal return byte (response byte)
  2265                              <1> 	;	     (Any requested value between 0 and 255)
  2266                              <1> 	;	     (Kernel will put it at the requested address)    	
  2267                              <1> 	;	BH = Time count unit
  2268                              <1> 	;	     0 = Stop timer event
  2269                              <1> 	;	     1 = 18.2 ticks per second
  2270                              <1> 	;	     2 = 10 milliseconds  		
  2271                              <1> 	;	     3 = 1 second (for real time clock interrupt) 	 
  2272                              <1> 	;	     4 = time/tick count in current time count unit
  2273                              <1> 	;	    // 10/12/2016			
  2274                              <1> 	;	    80h = Stop timer event (callback method)
  2275                              <1> 	;	    81h = 18.2 ticks per second, callback method
  2276                              <1> 	;	    82h = 10 milliseconds, callback method 	
  2277                              <1> 	;	    83h = 1 second (for RTC int), callback method 	
  2278                              <1> 	;	    84h = current time count unit, callback method
  2279                              <1> 	;
  2280                              <1> 	;	    Note: Only 03h or 83h will set real time clock
  2281                              <1> 	;		  (RTC) events (Others are for PIT events)! 	
  2282                              <1> 	;	
  2283                              <1> 	;	NOTE: If callback (user service) method is used,
  2284                              <1> 	;	    EDX will point to the return address (of service
  2285                              <1> 	;	    procedure) in user's space instead of signal 
  2286                              <1> 	;	    response byte address. (TRDOS 386 kernel will
  2287                              <1> 	;	    direct the cpu to that address -in user's space-
  2288                              <1> 	;	    at the return of system call or interrupt 
  2289                              <1> 	;	    just after the adjusted count/time is elapsed.)
  2290                              <1> 	;	    User's sevice routine must be ended with a
  2291                              <1> 	;	    'iret'. Normal return addresses from system 
  2292                              <1> 	;	    calls or and interrupts will be kept same except
  2293                              <1> 	;	    the timer returns. 			
  2294                              <1>      	;
  2295                              <1> 	;	BH = 0 -> Stop timer event
  2296                              <1> 	;	BL = Timer event number (1 to 255) if BH = 0     	
  2297                              <1> 	;	     If BL = 0, all timer events (which are belongs
  2298                              <1> 	;	      to running process) will be stopped 		    
  2299                              <1> 	;	ECX = Time/Tick count (depending on time count unit)
  2300                              <1> 	;	EDX = Signal return (Response) byte address
  2301                              <1> 	;	      (virtual address in user's memory space)
  2302                              <1> 	; OUTPUT ->
  2303                              <1> 	;	AL = Timer event number	(1 to 255) (max. value = 16)
  2304                              <1> 	;	IF BH Input = 0 & CF = 0 & AL = 0 -> 
  2305                              <1> 	;	     timer event(s) has/have been stopped/finished
  2306                              <1> 	;	CF = 1 & AL = 0 -> no timer setting space to set
  2307                              <1> 	;	CF = 1 & AL > 0 -> timer count unit is not usable
  2308                              <1> 	;
  2309                              <1> 	;	NOTE: To modify a time count for a user function,
  2310                              <1> 	;	      at first, current timer event must be stopped
  2311                              <1> 	;	      then a new timer event (which is related with
  2312                              <1> 	;	      same user function) must be started.
  2313                              <1> 	;		
  2314                              <1> 	;	      Signal return (response) byte may be used for 
  2315                              <1> 	;	      several purposes. Kernel will put this value 
  2316                              <1> 	;	      to requested address during timer interrupt,
  2317                              <1> 	;	      program/user can check this value to understand
  2318                              <1> 	;	      which event has been occurred and what is changed.
  2319                              <1> 	;	      (Multi timer events can share same signal address)
  2320                              <1> 	;	
  2321                              <1> 	;	NOTE: If the process is running while the time count
  2322                              <1> 	;	      is reached, kernel will put signal return (response)
  2323                              <1> 	;	      byte value at requested address during timer
  2324                              <1> 	;	      interrupt and the process will continue to run.
  2325                              <1> 	;	      Program/process must call (jump to) it's timer event
  2326                              <1> 	;	      function as required, for checking the timer event
  2327                              <1> 	;	      status via signal return (response) byte address. 
  2328                              <1> 	;
  2329                              <1> 	;	      If the process is not running (waiting or sleeping
  2330                              <1> 	;	      or released) while the time count is reached,
  2331                              <1> 	;	      it is restarted from where it left, to ensure
  2332                              <1> 	;	      proper multi media (video, audio, clock, timer)
  2333                              <1> 	;	      functionality.
  2334                              <1> 	;
  2335                              <1> 	;	      (It is better to use 'syswait' or 'syssleep',
  2336                              <1> 	;	      or 'sysrele' system call just after the timer
  2337                              <1> 	;	      function. Otherwise, timer events may block other
  2338                              <1> 	;	      processes which are not using timer events.)  	 		 			 		 	
  2339                              <1> 	;	     	      		 			
  2340                              <1> 	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  2341                              <1> 	;       Owner:	        resb 1 ; 0 = free
  2342                              <1> 	;		  	       ;>0 = process number (u.uno)
  2343                              <1> 	;	Calback:	resb 1 ; 1 = callback, 0 = response byte
  2344                              <1> 	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  2345                              <1> 	;		   	       ; 1 = Real Time Clock interrupt 
  2346                              <1> 	;	Response:       resb 1 ; 0 to 255, signal return value
  2347                              <1> 	;	Count Limit:	resd 1 ; count of ticks (total/set)
  2348                              <1> 	;	Current Count: 	resd 1 ; count of ticks (current)
  2349                              <1> 	;	Response Addr:  resd 1 ; response byte (pointer) address
  2350                              <1> 	;
  2351                              <1> 
  2352                              <1> 	; 19/12/2016 (timer callback)
  2353 0000CC5D C605[B4540100]00    <1> 	mov	byte [tcallback], 0 
  2354 0000CC64 C605[B5540100]00    <1> 	mov	byte [trtc], 0
  2355 0000CC6B C705[6C5D0100]0000- <1> 	mov	dword [u.tcb], 0 ; this is not necessary...
  2355 0000CC73 0000                <1>
  2356                              <1> 
  2357 0000CC75 80FF80              <1> 	cmp	bh, 80h
  2358 0000CC78 7225                <1> 	jb	short systimer_cb2
  2359 0000CC7A 7704                <1> 	ja	short systimer_cb0
  2360                              <1> 
  2361 0000CC7C 31D2                <1> 	xor	edx, edx ; 0, reset callback address
  2362 0000CC7E EB0B                <1> 	jmp	short systimer_cb1
  2363                              <1> 
  2364                              <1> systimer_cb0:
  2365 0000CC80 80FF84              <1> 	cmp	bh, 84h	
  2366 0000CC83 7764                <1> 	ja	short systimer_5 ;  undefined, error
  2367                              <1> 
  2368                              <1> 	;mov	byte [tcallback], 1 ; 19/12/2016
  2369 0000CC85 FE05[B4540100]      <1> 	inc	byte [tcallback]
  2370                              <1> 
  2371                              <1> systimer_cb1:
  2372 0000CC8B 0FB635[4F5D0100]    <1> 	movzx	esi, byte [u.uno] ; process number
  2373 0000CC92 66C1E602            <1> 	shl	si, 2	
  2374 0000CC96 8996[A85A0100]      <1> 	mov	[esi+p.tcb-4], edx ; set process timer callback address
  2375                              <1> 				   ; (overwrite prev value if it is set!)
  2376 0000CC9C 80E77F              <1> 	and	bh, 7Fh
  2377                              <1> 
  2378                              <1> systimer_cb2:
  2379 0000CC9F 80FF02              <1> 	cmp	bh, 2
  2380 0000CCA2 7445                <1>         je      short systimer_5  ; only 18.2 ticks per second is usable
  2381                              <1> 				  ; 10 milliseconds (100 Hertz) timer 
  2382                              <1> 				  ; will be set later (18/05/2016)
  2383 0000CCA4 774B                <1>         ja      short systimer_6 
  2384                              <1> 
  2385 0000CCA6 20FF                <1> 	and	bh, bh
  2386 0000CCA8 0F84BA000000        <1>         jz      systimer_9        ; stop timer event(s)
  2387                              <1> 
  2388                              <1> 	; bh = 1 (timer interrupt, 18.2 Hz, IBM PC/AT ROMBIOS default)
  2389                              <1> 
  2390                              <1> systimer_19:
  2391 0000CCAE B00A                <1> 	mov	al, 10 ; (*)
  2392                              <1> 
  2393                              <1> systimer_0:
  2394 0000CCB0 B710                <1> 	mov	bh, 16
  2395                              <1> 	;
  2396 0000CCB2 383D[774F0100]      <1> 	cmp	[timer_events], bh ; 16 ; 07/06/2016
  2397 0000CCB8 7319                <1> 	jnb 	short systimer_3  ; max. 16 timer events
  2398                              <1> 	;
  2399 0000CCBA 50                  <1> 	push	eax ; (*)
  2400                              <1> 
  2401 0000CCBB BF[FC5D0100]        <1> 	mov	edi, timer_set  ; beginning address of timer events
  2402                              <1> 				; setting space
  2403 0000CCC0 30C0                <1> 	xor	al, al ; 0
  2404                              <1> systimer_1:
  2405 0000CCC2 FEC0                <1> 	inc	al
  2406 0000CCC4 803F00              <1> 	cmp	byte [edi], 0 	; is it free space ?
  2407 0000CCC7 7639                <1> 	jna	short systimer_7 ; yes
  2408 0000CCC9 FECF                <1> 	dec	bh
  2409 0000CCCB 7405                <1> 	jz	short systimer_2
  2410 0000CCCD 83C710              <1> 	add	edi, 16
  2411 0000CCD0 EBF0                <1> 	jmp	short  systimer_1 ; next event space
  2412                              <1> 
  2413                              <1> systimer_2:
  2414 0000CCD2 58                  <1> 	pop	eax ; (*) discard
  2415                              <1> systimer_3:
  2416 0000CCD3 C605[005D0100]00    <1> 	mov	byte [u.r0], 0
  2417                              <1> systimer_4:
  2418 0000CCDA C705[645D0100]1B00- <1>         mov     dword [u.error], ERR_MISC
  2418 0000CCE2 0000                <1>
  2419                              <1>                                 ; one of miscellaneous/other errors
  2420 0000CCE4 E906F7FFFF          <1> 	jmp	error ; cf -> 1
  2421                              <1> 
  2422                              <1> systimer_5:
  2423 0000CCE9 883D[005D0100]      <1> 	mov	[u.r0], bh ; Time count unit (=2 or >3)
  2424 0000CCEF EBE9                <1> 	jmp	short systimer_4 ; 07/06/2016
  2425                              <1> 
  2426                              <1> systimer_6:
  2427 0000CCF1 80FF04              <1> 	cmp	bh, 4
  2428 0000CCF4 77F3                <1>         ja      short systimer_5  ; undefined time count unit
  2429                              <1> 	;jb	short systimer_16	
  2430                              <1> 
  2431                              <1> 	;mov	al, 1	; default (use current timer unit)
  2432                              <1> 			; countdown value is in ECX ! 
  2433                              <1> 			; max. value of ecx = 4294967296/10
  2434                              <1>         ;jmp    short systimer_0
  2435                              <1> 	;jmp	short systimer_19	
  2436 0000CCF6 74B6                <1> 	je	short systimer_19
  2437                              <1> 
  2438                              <1> systimer_16:
  2439                              <1> 	; bh = 3
  2440                              <1> 	; timer event via real time clock interrupt
  2441                              <1> 	; interrupt/update frequency: 1 Hz (1 tick per second)
  2442                              <1> 	
  2443 0000CCF8 B0B6                <1> 	mov	al, 182 ; (*) ; 18.2 * 10
  2444 0000CCFA FE05[B5540100]      <1> 	inc	byte [trtc] ; timer event via real time clock
  2445 0000CD00 EBAE                <1>         jmp     short systimer_0
  2446                              <1> 
  2447                              <1> systimer_7:
  2448 0000CD02 A2[005D0100]        <1> 	mov	[u.r0], al ; timer event number
  2449                              <1> 	;
  2450                              <1> 	; edi = address of empty timer event area
  2451 0000CD07 A0[4F5D0100]        <1> 	mov	al, [u.uno]
  2452 0000CD0C FA                  <1> 	cli 	; disable interrupts 
  2453 0000CD0D AA                  <1> 	stosb	; process number
  2454 0000CD0E A0[B4540100]        <1> 	mov	al, [tcallback] ; timer callback flag
  2455 0000CD13 AA                  <1> 	stosb 	; 1= callback method, 0= signal response byte method
  2456 0000CD14 A0[B5540100]        <1> 	mov	al, [trtc] ; timer interrupt type
  2457 0000CD19 AA                  <1> 	stosb	; 1= real time clock, 0= programmable interval timer
  2458 0000CD1A 88D8                <1> 	mov	al, bl ; Signal return (Response) value
  2459 0000CD1C AA                  <1> 	stosb   ; response byte
  2460 0000CD1D 58                  <1> 	pop	eax ; (*) ; 10 or 182
  2461 0000CD1E 89D3                <1> 	mov	ebx, edx ; virtual address for response/signal byte
  2462 0000CD20 F7E1                <1> 	mul	ecx
  2463                              <1> 	; (eax = 10 * count of 18.2 Hz timer ticks)
  2464                              <1> 	; (count down step = 10)
  2465 0000CD22 AB                  <1> 	stosd  ; count limit (reset value)
  2466 0000CD23 AB                  <1> 	stosd  ; current count value
  2467                              <1> 
  2468                              <1> 	; 19/12/2016
  2469 0000CD24 803D[B4540100]00    <1> 	cmp	byte [tcallback], 0 ; timer callback method ?
  2470 0000CD2B 7604                <1> 	jna	short systimer_17 ; no	
  2471 0000CD2D 89D8                <1> 	mov	eax, ebx ; virtual address for callback routine 
  2472 0000CD2F EB0D                <1> 	jmp	short systimer_18
  2473                              <1> 
  2474                              <1> systimer_17: ; signal response byte method
  2475                              <1> 	; ebx = virtual address
  2476                              <1> 	; [u.pgdir] = page directory's physical address
  2477                              <1> 	; 20/02/2017
  2478 0000CD31 FE05[B6540100]      <1> 	inc	 byte [no_page_swap] ; 1 
  2479                              <1> 			; Do not add this page to swap queue
  2480                              <1> 			; and remove it from swap queue if it is
  2481                              <1> 			; on the queue.
  2482 0000CD37 E85285FFFF          <1> 	call	get_physical_addr
  2483 0000CD3C 721A                <1> 	jc	short systimer_8 ; 07/06/2016
  2484                              <1> 	; eax = physical address of the virtual address in user's space
  2485                              <1> systimer_18:
  2486 0000CD3E AB                  <1> 	stosd	; response addr (physical) or callback addr (virtual)
  2487 0000CD3F FE05[774F0100]      <1> 	inc	byte [timer_events] ; 07/06/201
  2488                              <1> 	; 02/01/2017
  2489 0000CD45 0FB605[4F5D0100]    <1> 	movzx	eax, byte [u.uno]
  2490 0000CD4C FE80[9B5A0100]      <1> 	inc	byte [eax+p.timer-1]	
  2491                              <1> 	;
  2492 0000CD52 FB                  <1> 	sti 	; enable interrupts
  2493 0000CD53 E9B7F6FFFF          <1> 	jmp	sysret
  2494                              <1> 
  2495                              <1> systimer_8:
  2496                              <1> 	; 10/06/2016
  2497                              <1> 	; 07/06/2016
  2498 0000CD58 28C0                <1> 	sub	al, al ; 0
  2499 0000CD5A 8847F4              <1> 	mov	[edi-12], al ; clear process number (free timer event)
  2500                              <1> 	;mov	dword [edi], eax ; 0
  2501 0000CD5D FB                  <1> 	sti
  2502 0000CD5E A2[005D0100]        <1> 	mov	[u.r0], al ; 0
  2503 0000CD63 E987F6FFFF          <1> 	jmp	error
  2504                              <1> 
  2505                              <1> systimer_9:
  2506                              <1> 	; 10/06/2016
  2507                              <1> 	; 07/06/2016
  2508 0000CD68 28C0                <1> 	sub	al, al
  2509 0000CD6A A2[005D0100]        <1> 	mov	byte [u.r0], al ; 0
  2510 0000CD6F 3805[774F0100]      <1> 	cmp     byte [timer_events], al ;  0
  2511 0000CD75 7631                <1> 	jna	short systimer_12
  2512                              <1> 
  2513                              <1> 	; Note: ecx and edx are undefined here
  2514                              <1> 	;	(for stop timer function)
  2515                              <1> 
  2516 0000CD77 BE[FC5D0100]        <1> 	mov	esi, timer_set  ; beginning address of timer events
  2517                              <1> 				; setting space	 
  2518 0000CD7C A0[4F5D0100]        <1> 	mov	al, [u.uno]
  2519                              <1> 	
  2520 0000CD81 B710                <1> 	mov	bh, 16
  2521                              <1> 
  2522 0000CD83 08DB                <1> 	or	bl, bl
  2523 0000CD85 7544                <1> 	jnz	short systimer_15
  2524                              <1> 
  2525                              <1> 	; clear timer event areas belong to current process
  2526                              <1> 	; (for stopping all timer events belong to current process) 
  2527 0000CD87 FA                  <1> 	cli 	; disable interrupts
  2528                              <1> systimer_10:
  2529                              <1> 	; 10/06/2016
  2530                              <1> 	; 07/06/2016 	
  2531 0000CD88 8A26                <1> 	mov	ah, [esi]
  2532 0000CD8A 08E4                <1> 	or	ah, ah ; 0 ?
  2533 0000CD8C 7411                <1> 	jz	short systimer_11
  2534 0000CD8E 38C4                <1> 	cmp	ah, al ; is the process number (owner) same ?
  2535 0000CD90 750D                <1>         jne     short systimer_11 ; no
  2536                              <1> 
  2537                              <1> 	;mov	byte [esi], 0
  2538 0000CD92 66C7060000          <1> 	mov	word [esi], 0 ; clear
  2539                              <1> 	;mov	dword [esi+12], 0 ; clear
  2540                              <1> 
  2541 0000CD97 FE0D[774F0100]      <1> 	dec	byte [timer_events]
  2542 0000CD9D 7409                <1> 	jz	short systimer_12
  2543                              <1> 
  2544                              <1> systimer_11:
  2545 0000CD9F FECF                <1> 	dec	bh
  2546 0000CDA1 7405                <1> 	jz	short systimer_12
  2547 0000CDA3 83C610              <1> 	add	esi, 16
  2548 0000CDA6 EBE0                <1> 	jmp	short systimer_10
  2549                              <1> 
  2550                              <1> systimer_12:
  2551 0000CDA8 0FB635[4F5D0100]    <1> 	movzx	esi, byte [u.uno]
  2552 0000CDAF 08DB                <1> 	or	bl, bl ; all timer events or one timer event ?
  2553 0000CDB1 740C                <1> 	jz	short systimer_13
  2554 0000CDB3 8A9E[9B5A0100]      <1> 	mov	bl, [esi+p.timer-1]
  2555 0000CDB9 20DB                <1> 	and	bl, bl	; previous number of timer events for the process
  2556 0000CDBB 7408                <1> 	jz	short systimer_14
  2557 0000CDBD FECB                <1> 	dec	bl  ; previous number of timer events for the process - 1
  2558                              <1> systimer_13:
  2559 0000CDBF 889E[9B5A0100]      <1> 	mov	[esi+p.timer-1], bl ; 0 ; no timer events for process
  2560                              <1> systimer_14:
  2561 0000CDC5 FB                  <1> 	sti	; enable interrupts
  2562 0000CDC6 E944F6FFFF          <1> 	jmp	sysret
  2563                              <1> 
  2564                              <1> systimer_15:
  2565 0000CDCB 38FB                <1> 	cmp	bl, bh ; 16
  2566 0000CDCD 0F8707FFFFFF        <1>         ja      systimer_4      ; max. 16 timer events !
  2567                              <1> 	;
  2568 0000CDD3 88DA                <1> 	mov	dl, bl
  2569 0000CDD5 FECA                <1> 	dec	dl  ; 16 -> 15 ... 1 -> 0 
  2570 0000CDD7 C0E204              <1> 	shl	dl, 4 ; * 16
  2571 0000CDDA 0FB6FA              <1> 	movzx	edi, dl
  2572 0000CDDD 01F7                <1> 	add	edi, esi ; timer_set 
  2573                              <1> 	
  2574 0000CDDF 3A07                <1> 	cmp	al, [edi] ; process number
  2575 0000CDE1 0F85F3FEFFFF        <1>         jne     systimer_4
  2576                              <1> 	
  2577                              <1> 	; same process ID
  2578 0000CDE7 FA                  <1> 	cli	; disable interrupts
  2579                              <1>  	; 10/06/2016 ; 02/01/2017
  2580                              <1> 	;mov	byte [edi], 0 
  2581 0000CDE8 66C7070000          <1> 	mov	word [edi], 0 ; clear
  2582                              <1> 	;mov	dword [edi+12], 0 ; clear
  2583 0000CDED FE0D[774F0100]      <1> 	dec	byte [timer_events]
  2584 0000CDF3 EBB3                <1> 	jmp	short systimer_12
  2585                              <1> 
  2586                              <1> sysmdate: ; < change the modification time of a file >
  2587                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  2588                              <1> 	; temporary !
  2589 0000CDF5 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  2590 0000CDFA A3[645D0100]        <1>         mov     [u.error], eax
  2591 0000CDFF A3[005D0100]        <1>         mov     [u.r0], eax 
  2592 0000CE04 E9E6F5FFFF          <1> 	jmp	error
  2593                              <1> 
  2594                              <1> sysvideo: ; VIDEO DATA TRANSFER FUNCTIONS
  2595                              <1> 	; 11/07/2016
  2596                              <1> 	; 13/06/2016
  2597                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  2598                              <1> 	;
  2599                              <1> 	;
  2600                              <1> 	; VIDEO DATA TRANSFER FUNCTIONS:
  2601                              <1> 	;
  2602                              <1> 	; Inputs:
  2603                              <1> 	;	BH = 0 = VIDEO BIOS Mode 3, tty/text mode data transfers
  2604                              <1> 	;	     BL = 
  2605                              <1> 	;		Bits 0&1, Transfer direction
  2606                              <1> 	;	     	 	0 - System to system
  2607                              <1> 	;			1 - User to system
  2608                              <1> 	;			2 - System to user
  2609                              <1> 	;			3 - User to user
  2610                              <1> 	;		Bits 2&3, Transfer Type
  2611                              <1> 	;			0 - Display page transfer	
  2612                              <1> 	;	     		1 - Display page window transfer
  2613                              <1> 	;	     		2 - Frame/Viewport/Window address transfer
  2614                              <1> 	;			3 - Window handle transfer		
  2615                              <1> 	;
  2616                              <1> 	;	     /// BL = 0 -> System to system (display page) transfer
  2617                              <1> 	;		 CL = Source page 
  2618                              <1> 	;		 DL = Destination page
  2619                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2620                              <1> 	;		 ECX = User buffer
  2621                              <1> 	;		 DL = Video page
  2622                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2623                              <1> 	;		(window in current display page and in current mode)	 	 		
  2624                              <1> 	;		 ESI = User's buffer address
  2625                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2626                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2627                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2628                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2629                              <1>         ;                If BL = 5 ->
  2630                              <1> 	;		 EDI = Swap address (in user's memory space)
  2631                              <1> 	;		 (If swap address > 0, previous content of the window
  2632                              <1> 	;		 will be saved into swap area in user's memory space)		
  2633                              <1> 	;	     /// BL = 4 -> system to system transfer 
  2634                              <1> 	;		 ESI = System's source buffer (video page) address
  2635                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2636                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2637                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2638                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2639                              <1> 	;		 EDI = System's destination buffer (video page) address
  2640                              <1> 	;
  2641                              <1> 	;	BH = 1 = CGA Graphics (0B8000h) data transfers
  2642                              <1> 	;	     BL = 
  2643                              <1> 	;	     	0 = Fill color (color in CL] (32K)
  2644                              <1> 	;		1 = User to system display page transfer
  2645                              <1> 	;		2 = System to user display page transfer
  2646                              <1> 	;		3 = NOT bits in window (ECX, EDX)
  2647                              <1> 	;		4 = Window copy (system to system)	
  2648                              <1> 	;	     	5 = User to system window transfer
  2649                              <1> 	;	     	6 = System to user window transfer
  2650                              <1> 	;		7 = AND display page bytes with CL
  2651                              <1> 	;		8 = OR display page bytes with CL
  2652                              <1> 	;		9 = XOR display page bytes with CL
  2653                              <1> 	;
  2654                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2655                              <1> 	;		 CL = Color value 
  2656                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2657                              <1> 	;		 ECX = User buffer
  2658                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2659                              <1> 	;		(window in current display page and in current mode)	 	 		
  2660                              <1> 	;		 ESI = User's buffer address
  2661                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2662                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2663                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2664                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2665                              <1>         ;	     /// BL = 4 -> system to system (window) transfer 
  2666                              <1> 	;		 ESI = System's source buffer (video page) address
  2667                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2668                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2669                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2670                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2671                              <1> 	;		 EDI = System's destination buffer (video page) address
  2672                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2673                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2674                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2675                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2676                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2677                              <1> 	;
  2678                              <1> 	;	BH = 2 = VGA Graphics (0A0000h) data transfers
  2679                              <1> 	;	     BL = 
  2680                              <1> 	;	     	x0h = Fill color (color in CL] (64K)
  2681                              <1> 	;		x1h = User to system display page transfer
  2682                              <1> 	;		x2h = System to user display page transfer
  2683                              <1> 	;		x3h = NOT bits in window (ECX, EDX)
  2684                              <1> 	;		x4h = Window copy (system to system)	
  2685                              <1> 	;	     	x5h = User to system window transfer
  2686                              <1> 	;	     	x6h = System to user window transfer
  2687                              <1> 	;		x7h = AND display page bytes with CL
  2688                              <1> 	;		x8h = OR display page bytes with CL
  2689                              <1> 	;		x9h = XOR display page bytes with CL
  2690                              <1> 	;		x = 0 -> screen width = 320
  2691                              <1> 	;		x = 1 -> screen width = 640
  2692                              <1> 	;		x = 2 -> screen width = 800
  2693                              <1> 	;
  2694                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2695                              <1> 	;		 CL = Color value 
  2696                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2697                              <1> 	;		 ECX = User buffer
  2698                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2699                              <1> 	;		(window in current display page and in current mode)	 	 		
  2700                              <1> 	;		 ESI = User's buffer address
  2701                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2702                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2703                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2704                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2705                              <1>        	;	     /// BL = 4 -> system to system (window) transfer 
  2706                              <1> 	;		 ESI = System's source buffer (video page) address
  2707                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2708                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2709                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2710                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2711                              <1> 	;		 EDI = System's destination buffer (video page) address
  2712                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2713                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2714                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2715                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2716                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2717                              <1> 	;
  2718                              <1> 	;	BH = 3 = Super VGA, LINEAR FRAME BUFFER data transfers
  2719                              <1> 	;	     BL = 
  2720                              <1> 	;	     	0 = Fill color (color in ECX] (Frame buffer size)
  2721                              <1> 	;		1 = User to system display page transfer
  2722                              <1> 	;		2 = System to user display page transfer
  2723                              <1> 	;		3 = NOT bits in window (ECX, EDX)
  2724                              <1> 	;		4 = Window copy (system to system)	
  2725                              <1> 	;	     	5 = User to system window transfer
  2726                              <1> 	;	     	6 = System to user window transfer
  2727                              <1> 	;		7 = AND display page bytes with ECX
  2728                              <1> 	;		8 = OR display page bytes with ECX
  2729                              <1> 	;		9 = XOR display page bytes with ECX
  2730                              <1> 	;
  2731                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2732                              <1> 	;		 CL = Color value 
  2733                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2734                              <1> 	;		 ECX = User buffer
  2735                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2736                              <1> 	;		(window in current display page and in current mode)	 	 		
  2737                              <1> 	;		 ESI = User's buffer address
  2738                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2739                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2740                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2741                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2742                              <1> 	;	     /// BL = 4 -> system to system (window) transfer 
  2743                              <1> 	;		 ESI = System's source buffer (video page) address
  2744                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2745                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2746                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2747                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2748                              <1> 	;		 EDI = System's destination buffer (video page) address
  2749                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2750                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2751                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2752                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2753                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2754                              <1> 	;
  2755                              <1> 	; Outputs:
  2756                              <1> 	;	EAX = transfer/byte count
  2757                              <1> 	;
  2758                              <1> 	;	NOTE: If the source or destination address passes out of
  2759                              <1> 	;	video pages (display memory limits), data will not be transferred
  2760                              <1> 	;	and EAX will return as 0.
  2761                              <1> 	;
  2762                              <1> 	;
  2763                              <1> 	; DIRECT (STANDARD VGA/CGA) DISPLAY MEMORY ACCESS FUNCTIONS:
  2764                              <1> 	;
  2765                              <1> 	;	BH = 4 = CGA direct video memory (0B8000h, 32K) access
  2766                              <1> 	;		Page directory & page tables of the user's
  2767                              <1> 	;		program will be updated to direct access to
  2768                              <1> 	;		0B8000h (32K) video (CGA, color) memory; if
  2769                              <1> 	;		there is not a permission  conflict or lock!  
  2770                              <1> 	;	        (User's program/process will have permision to
  2771                              <1> 	;		access locked display memory if the owner is
  2772                              <1> 	;		it's parent.)
  2773                              <1>         ;
  2774                              <1> 	;	    Screen width = 320	
  2775                              <1> 	;
  2776                              <1> 	;	BH = 5 = VGA direct video memory (0A0000h, 64K) access
  2777                              <1> 	;		Page directory & page tables of the user's
  2778                              <1> 	;		program will be updated to direct access to
  2779                              <1> 	;		0A0000h (64K) video (VGA) memory; if there is not
  2780                              <1> 	;		a permission conflict or lock!  
  2781                              <1> 	;	        (User's program/process will have permision to
  2782                              <1> 	;		access locked display memory if the owner is
  2783                              <1> 	;		it's parent.)
  2784                              <1> 	;		
  2785                              <1> 	;	    BL = Screen width (320, 640, 800) 
  2786                              <1> 	;			
  2787                              <1> 	; Outputs:
  2788                              <1> 	;	EAX = Display mmory address for direct access
  2789                              <1> 	;	      0A0000h for VGA, 0B8000h for CGA	
  2790                              <1> 	;	(Display memory size: 32K for CGA, 64K for VGA)
  2791                              <1> 	; 	EAX = 0 if display page access permission has been denied. 
  2792                              <1> 	;	      (Locked!) 	
  2793                              <1> 	;	      	 	
  2794                              <1> 	; LINEAR FRAME BUFFER ACCESS FUNCTIONS:
  2795                              <1> 	;
  2796                              <1> 	;	BH = 6 = Linear Frame Buffer direct video memory access
  2797                              <1> 	;
  2798                              <1> 	;		Page directory & page tables of the user's
  2799                              <1> 	;		program will be updated to direct access to
  2800                              <1> 	;		the configured LFB (Linear Frame Buffer) address,
  2801                              <1> 	;		if there is not a permission conflict or lock!  
  2802                              <1> 	;	        (User's program/process will have permision to
  2803                              <1> 	;		access locked display memory if the owner is
  2804                              <1> 	;		it's parent.)
  2805                              <1> 	;			
  2806                              <1> 	;		Return: EAX = Linear Frame Buffer address
  2807                              <1> 	;			EDX = Frame Buffer Size in bytes	
  2808                              <1> 	;	
  2809                              <1> 	;	BH = 7 = Get Linear Frame Buffer info (for current mode)
  2810                              <1> 	;		
  2811                              <1> 	;		Return:
  2812                              <1> 	;		EAX = Frame Buffer Address (0 = is not in use)
  2813                              <1> 	;		EDX = Frame Buffer Size in bytes
  2814                              <1> 	;		BL = Current Video Mode
  2815                              <1> 	;		     BL = 0FFh -> Super VGA (Extended VGA)
  2816                              <1> 	;		     If BL = 0FFh, 
  2817                              <1>         ;                       BH = 0 = 16 colors
  2818                              <1> 	;			BH = 1 = 256 colors
  2819                              <1> 	;			BH = 2 = 66536 colors
  2820                              <1> 	;			BH = 3 = 24 bits TRUE (16M) colors
  2821                              <1> 	;			BH = 4 = 32 bits TRUE (16M) colors
  2822                              <1> 	;		ECX = Pixel resolution
  2823                              <1> 	;		      CX = Width (640, 800, 1024, 1366, 1920)
  2824                              <1> 	;		      High 16 bits of ECX = Height  
  2825                              <1> 	;
  2826                              <1> 	;	NOTE: Each process will have it's own frame buffer
  2827                              <1> 	;	      address and resolution parameters in 'u' area.
  2828                              <1> 	;	      Then, if the current frame buffer & resolution
  2829                              <1> 	;	      is different, frame buffer r/w functions
  2830                              <1> 	;	      will use scale factor to convert process's
  2831                              <1>         ;             pixel coordinates to actual screen coordinates.                            
  2832                              <1> 	;	      resolution -> dimensional scale
  2833                              <1> 	;	      color size -> color scale
  2834                              <1> 	;	     * RGB (TRUE) colors to 256 colors conversion:	
  2835                              <1>         ;             TRUE Colors -> 8,8,8 (R,G,B; byte 0 is R)            
  2836                              <1> 	;	      256 colors -> 2,2,2,2 (R,G,B,L; bit 0&1 is R)
  2837                              <1> 	; 		  bit 6&7 -> luminosity base level (0,1,2,3)
  2838                              <1> 	;		  bit 4&5 -> blue level (0,1,2,3)
  2839                              <1> 	;		  bit 2%3 -> green level (0,1,2,3)
  2840                              <1> 	;		  bit 0&1 -> red level (0,1,2,3)
  2841                              <1> 	;	      Example: total red level : luminosity + red level   				
  2842                              <1> 	;	      Luminosity base level: 0 -> 16
  2843                              <1> 	;		 		     1 -> 32
  2844                              <1> 	;				     2 -> 64
  2845                              <1> 	;				     3 -> 128
  2846                              <1> 	;	      Color level:	
  2847                              <1> 	;				    0 -> 0
  2848                              <1> 	;				    1 -> luminosity level
  2849                              <1> 	;				    2 -> luminosity level + 64
  2850                              <1> 	;				    3 -> 255
  2851                              <1> 	;	     Luminosity base level = min (R,G,B)
  2852                              <1> 	;			if it is <16, it will be set to 16
  2853                              <1> 	;	     Color levels: Color values are fixed to (nearest) 
  2854                              <1> 	;		   one of all possible set level (step) values
  2855                              <1> 	;		   (according to luminosity base level); then
  2856                              <1> 	;		   color levels are set to R-L, G-L, B-L.
  2857                              <1> 	;	 For example: If luminosity base level is 32
  2858                              <1> 	;		  all possible set values are 0, 32, 96, 255. 	 			
  2859                              <1> 	;
  2860                              <1> 	;	    * RGB (TRUE) colors to 16 colors conversion:
  2861                              <1> 	;	    16 colors: R, B,G, L bits (4 bits)
  2862                              <1> 	;	    	   If any one of R,G,B >= 128 L = 1 		     	
  2863                              <1>  	;		   If max. value of (R,G,B) >= 32, it is 1
  2864                              <1> 	;		      else all color bits (R&G&B&L) are 0
  2865                              <1> 	;		   If the second value >= max. value / 2
  2866                              <1> 	;		      it is 1
  2867                              <1> 	;		   If third value value >= max. value / 2
  2868                              <1> 	;		      it is 1
  2869                              <1> 	;	    Example: R = 132, G = 64, B = 78
  2870                              <1> 	;		     L = 1, R = 1
  2871                              <1> 	;		     G < 66 --> G = 0
  2872                              <1> 	;		     B >= 66 --> B = 1	 		 	  								 	 					
  2873                              <1> 
  2874                              <1> 	; 16/05/2016
  2875 0000CE09 31C0                <1> 	xor	eax, eax
  2876 0000CE0B A3[005D0100]        <1> 	mov	[u.r0], eax
  2877                              <1> 
  2878 0000CE10 20FF                <1> 	and	bh, bh
  2879 0000CE12 0F8572020000        <1> 	jnz	sysvideo_13 ; 11/07/2016
  2880                              <1> 	
  2881                              <1> 	; Video mode 0, 80*25 text mode, CGA 16 colors  ; [CRT_MODE] = 3
  2882 0000CE18 88DF                <1> 	mov	bh, bl
  2883 0000CE1A C0EF02              <1> 	shr	bh, 2
  2884 0000CE1D 20FF                <1> 	and	bh, bh
  2885 0000CE1F 0F8598000000        <1>         jnz     sysvideo_4
  2886 0000CE25 BF00800B00          <1> 	mov	edi, 0B8000h
  2887 0000CE2A 20D2                <1> 	and	dl, dl
  2888 0000CE2C 7413                <1> 	jz	short sysvideo_1
  2889 0000CE2E 80FA07              <1> 	cmp	dl, 7
  2890 0000CE31 0F87D8F5FFFF        <1> 	ja	sysret
  2891                              <1> sysvideo_0:
  2892 0000CE37 81C7A00F0000        <1> 	add	edi, 80*25*2
  2893 0000CE3D FECA                <1> 	dec	dl
  2894 0000CE3F 75F6                <1> 	jnz	short sysvideo_0	
  2895                              <1> sysvideo_1:	
  2896 0000CE41 80E303              <1> 	and	bl, 3
  2897 0000CE44 7530                <1> 	jnz	short sysvideo_2
  2898 0000CE46 80F907              <1> 	cmp	cl, 7
  2899 0000CE49 0F87C0F5FFFF        <1> 	ja	sysret
  2900                              <1> 	; system to system video/display page transfer (mode 0)
  2901 0000CE4F BE00800B00          <1> 	mov	esi, 0B8000h
  2902 0000CE54 0FB6C1              <1> 	movzx	eax, cl
  2903 0000CE57 BAA00F0000          <1> 	mov	edx, 80*25*2
  2904 0000CE5C F7E2                <1> 	mul	edx
  2905 0000CE5E 01C6                <1> 	add	esi, eax
  2906 0000CE60 B9A00F0000          <1> 	mov	ecx, (80*25*2)
  2907 0000CE65 890D[005D0100]      <1> 	mov	[u.r0], ecx
  2908 0000CE6B 66C1E902            <1> 	shr	cx, 2 ; /4
  2909 0000CE6F F3A5                <1> 	rep	movsd
  2910 0000CE71 E999F5FFFF          <1> 	jmp	sysret	
  2911                              <1> sysvideo_2:  
  2912 0000CE76 80FB02              <1> 	cmp	bl, 2
  2913 0000CE79 0F8790F5FFFF        <1>         ja      sysret
  2914 0000CE7F 721F                <1> 	jb	short sysvideo_3
  2915                              <1> 	; system to user video/display page transfer (mode 0)
  2916 0000CE81 89FE                <1> 	mov	esi, edi
  2917 0000CE83 89CF                <1> 	mov	edi, ecx ; user buffer
  2918 0000CE85 B9A00F0000          <1> 	mov	ecx, 80*25*2
  2919 0000CE8A E83D190000          <1> 	call	transfer_to_user_buffer ; fast transfer
  2920 0000CE8F 0F827AF5FFFF        <1> 	jc	sysret
  2921 0000CE95 890D[005D0100]      <1> 	mov	[u.r0], ecx
  2922 0000CE9B E96FF5FFFF          <1> 	jmp	sysret 	
  2923                              <1> sysvideo_3: 
  2924                              <1> 	; user to system video/display page transfer (mode 0)	
  2925 0000CEA0 89CE                <1> 	mov	esi, ecx ; user buffer
  2926                              <1> 	; edi = video page address
  2927 0000CEA2 B9A00F0000          <1> 	mov	ecx, 80*25*2
  2928 0000CEA7 E86A190000          <1> 	call	transfer_from_user_buffer ; fast transfer
  2929 0000CEAC 0F825DF5FFFF        <1> 	jc	sysret
  2930 0000CEB2 890D[005D0100]      <1> 	mov	[u.r0], ecx		
  2931 0000CEB8 E952F5FFFF          <1> 	jmp	sysret
  2932                              <1> sysvideo_4:
  2933 0000CEBD 80E303              <1> 	and	bl, 3
  2934 0000CEC0 0F85F6000000        <1>         jnz     sysvideo_9
  2935 0000CEC6 80F907              <1> 	cmp	cl, 7
  2936 0000CEC9 0F8740F5FFFF        <1> 	ja	sysret
  2937                              <1> 	; system to system video/display page window transfer (mode 0)
  2938 0000CECF 81FE00800B00        <1> 	cmp	esi, 0B8000h
  2939 0000CED5 0F8234F5FFFF        <1> 	jb	sysret
  2940 0000CEDB 81FE00FD0B00        <1> 	cmp	esi, 0B8000h+(80*25*2*8)
  2941 0000CEE1 0F8328F5FFFF        <1> 	jnb	sysret
  2942 0000CEE7 81FF00800B00        <1> 	cmp	edi, 0B8000h
  2943 0000CEED 0F821CF5FFFF        <1> 	jb	sysret
  2944 0000CEF3 81FF00FD0B00        <1>         cmp     edi, 0B8000h+(80*25*2*8)
  2945 0000CEF9 0F8310F5FFFF        <1> 	jnb	sysret
  2946                              <1> 	;
  2947 0000CEFF 51                  <1> 	push	ecx
  2948 0000CF00 52                  <1> 	push	edx
  2949 0000CF01 0FB7C1              <1> 	movzx	eax, cx ; top left column
  2950 0000CF04 50                  <1> 	push	eax
  2951 0000CF05 C1E910              <1> 	shr	ecx, 16 ; top row
  2952 0000CF08 66B8A000            <1> 	mov	ax, 80*2 ; 80 colums, 160 bytes per row
  2953 0000CF0C F7E1                <1> 	mul	ecx
  2954 0000CF0E 01C6                <1> 	add	esi, eax
  2955 0000CF10 01C7                <1> 	add	edi, eax
  2956 0000CF12 58                  <1> 	pop	eax
  2957 0000CF13 66D1E0              <1> 	shl	ax, 1 ; *2 	
  2958 0000CF16 01C6                <1> 	add	esi, eax
  2959 0000CF18 01C7                <1> 	add	edi, eax
  2960 0000CF1A 5A                  <1> 	pop	edx
  2961 0000CF1B 59                  <1> 	pop	ecx
  2962 0000CF1C B800FD0B00          <1> 	mov	eax, 0B8000h+(80*25*2*8)
  2963 0000CF21 39C6                <1> 	cmp	esi, eax
  2964 0000CF23 0F83E6F4FFFF        <1> 	jnb	sysret
  2965 0000CF29 39C6                <1> 	cmp	esi, eax
  2966 0000CF2B 0F83DEF4FFFF        <1> 	jnb	sysret	
  2967                              <1> 
  2968 0000CF31 56                  <1> 	push	esi ; ****
  2969 0000CF32 57                  <1> 	push	edi ; ***
  2970 0000CF33 52                  <1> 	push	edx ; **
  2971 0000CF34 51                  <1> 	push	ecx ; *
  2972 0000CF35 C1E910              <1> 	shr	ecx, 16 ; top row
  2973 0000CF38 C1EA10              <1> 	shr	edx, 16 ; bottom row
  2974 0000CF3B 83F918              <1> 	cmp	ecx, 24 ; max. 25 rows
  2975 0000CF3E 7773                <1> 	ja	short sysvideo_6
  2976 0000CF40 83FA18              <1> 	cmp	edx, 24 ; max. 25 rows
  2977 0000CF43 776E                <1> 	ja	short sysvideo_6		
  2978 0000CF45 28CA                <1> 	sub	dl, cl
  2979 0000CF47 726A                <1> 	jc	short sysvideo_6
  2980 0000CF49 50                  <1> 	push	eax ; *****
  2981 0000CF4A 89D3                <1> 	mov	ebx, edx ; row count - 1
  2982 0000CF4C B8A0000000          <1> 	mov	eax, 80*2
  2983 0000CF51 F7E0                <1> 	mul	eax
  2984 0000CF53 01C6                <1> 	add	esi, eax
  2985 0000CF55 01C7                <1> 	add	edi, eax
  2986 0000CF57 58                  <1> 	pop	eax ; *****
  2987 0000CF58 39C6                <1> 	cmp	esi, eax
  2988 0000CF5A 7757                <1> 	ja	short sysvideo_6
  2989 0000CF5C 39C7                <1> 	cmp	edi, eax
  2990 0000CF5E 7753                <1> 	ja	short sysvideo_6
  2991 0000CF60 59                  <1> 	pop	ecx ; *
  2992 0000CF61 5A                  <1> 	pop	edx ; **
  2993 0000CF62 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  2994 0000CF68 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  2995 0000CF6E 83F94F              <1> 	cmp	ecx, 79 ; max. 80 columns
  2996 0000CF71 7742                <1> 	ja	short sysvideo_7
  2997 0000CF73 83FA4F              <1> 	cmp	edx, 79 ; max. 80 columns
  2998 0000CF76 773D                <1> 	ja	short sysvideo_7
  2999 0000CF78 28CA                <1> 	sub	dl, cl
  3000 0000CF7A 7639                <1> 	jna	short sysvideo_7
  3001                              <1> 	; edx = column count (width) - 1
  3002 0000CF7C D0E2                <1> 	shl	dl, 1
  3003 0000CF7E 01D6                <1> 	add	esi, edx
  3004 0000CF80 01D7                <1> 	add	edi, edx
  3005 0000CF82 39C6                <1> 	cmp	esi, eax
  3006 0000CF84 772F                <1> 	ja	short sysvideo_7
  3007 0000CF86 39C7                <1> 	cmp	edi, eax
  3008 0000CF88 772B                <1> 	ja	short sysvideo_7
  3009 0000CF8A 5F                  <1> 	pop	edi ; ***
  3010 0000CF8B 5E                  <1> 	pop	esi ; ****
  3011 0000CF8C FEC3                <1> 	inc	bl
  3012 0000CF8E FEC2                <1> 	inc	dl ; column count
  3013 0000CF90 88D7                <1> 	mov	bh, dl
  3014 0000CF92 D0E2                <1> 	shl	dl, 1
  3015 0000CF94 B8A0000000          <1> 	mov	eax, 80*2
  3016 0000CF99 28D0                <1> 	sub	al, dl ; (80 - columns) * 2
  3017                              <1> sysvideo_5:	
  3018 0000CF9B 88F9                <1> 	mov	cl, bh
  3019 0000CF9D 0115[005D0100]      <1> 	add	[u.r0], edx
  3020 0000CFA3 F366A5              <1> 	rep	movsw
  3021 0000CFA6 01C6                <1> 	add	esi, eax ; next row
  3022 0000CFA8 01C7                <1> 	add	edi, eax ; next row
  3023 0000CFAA FECB                <1> 	dec	bl
  3024 0000CFAC 75ED                <1> 	jnz	short sysvideo_5
  3025 0000CFAE E95CF4FFFF          <1> 	jmp	sysret
  3026                              <1> 
  3027                              <1> sysvideo_6:
  3028 0000CFB3 59                  <1> 	pop	ecx ; *
  3029 0000CFB4 5A                  <1> 	pop	edx ; **
  3030                              <1> sysvideo_7:	
  3031 0000CFB5 5F                  <1> 	pop	edi ; ***
  3032 0000CFB6 5E                  <1> 	pop	esi ; ****
  3033 0000CFB7 E953F4FFFF          <1> 	jmp	sysret
  3034                              <1> 
  3035                              <1> sysvideo_9:  
  3036 0000CFBC 80FB02              <1> 	cmp	bl, 2
  3037 0000CFBF 0F874AF4FFFF        <1>         ja      sysret
  3038                              <1> 
  3039 0000CFC5 56                  <1> 	push	esi ; ****
  3040 0000CFC6 57                  <1> 	push	edi ; ***
  3041 0000CFC7 52                  <1> 	push	edx ; **
  3042 0000CFC8 51                  <1> 	push	ecx ; *
  3043                              <1> 
  3044 0000CFC9 C1E910              <1> 	shr	ecx, 16 ; top row
  3045 0000CFCC C1EA10              <1> 	shr	edx, 16 ; bottom row
  3046 0000CFCF 83F918              <1> 	cmp	ecx, 24 ; max. 25 rows
  3047 0000CFD2 77DF                <1> 	ja	short sysvideo_6
  3048 0000CFD4 83FA18              <1> 	cmp	edx, 24 ; max. 25 rows
  3049 0000CFD7 77DA                <1> 	ja	short sysvideo_6		
  3050 0000CFD9 28CA                <1> 	sub	dl, cl
  3051 0000CFDB 72D6                <1> 	jc	short sysvideo_6
  3052                              <1> 
  3053 0000CFDD 88CD                <1> 	mov	ch, cl ; top row
  3054 0000CFDF 8A0D[0E420100]      <1> 	mov	cl, [ACTIVE_PAGE]
  3055 0000CFE5 BFA00F0000          <1> 	mov	edi, 80*25*2
  3056 0000CFEA D3E7                <1> 	shl	edi, cl 
  3057 0000CFEC 81C760700B00        <1> 	add	edi, 0B8000h - 80*25*2
  3058                              <1> 
  3059 0000CFF2 88D7                <1> 	mov	bh, dl ; row count - 1
  3060 0000CFF4 88EA                <1> 	mov	dl, ch ; top row
  3061 0000CFF6 B8A0000000          <1> 	mov	eax, 80*2
  3062 0000CFFB F7E2                <1> 	mul	edx
  3063 0000CFFD 01C7                <1> 	add	edi, eax
  3064                              <1> 
  3065 0000CFFF 59                  <1> 	pop	ecx ; *
  3066 0000D000 5A                  <1> 	pop	edx ; **
  3067 0000D001 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  3068 0000D007 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  3069 0000D00D 83F94F              <1> 	cmp	ecx, 79 ; max. 80 columns
  3070 0000D010 77A3                <1> 	ja	short sysvideo_7
  3071 0000D012 83FA4F              <1> 	cmp	edx, 79 ; max. 80 columns
  3072 0000D015 779E                <1> 	ja	short sysvideo_7
  3073                              <1> 	
  3074 0000D017 28CA                <1> 	sub	dl, cl
  3075 0000D019 769A                <1> 	jna	short sysvideo_7
  3076                              <1> 	
  3077 0000D01B 0FB6C1              <1> 	movzx	eax, cl ; left column
  3078 0000D01E D0E0                <1> 	shl	al, 1  ; column * 2
  3079 0000D020 01C7                <1> 	add	edi, eax
  3080                              <1> 
  3081 0000D022 FEC2                <1> 	inc	dl ; column count
  3082 0000D024 D0E2                <1> 	shl	dl, 1
  3083 0000D026 88D1                <1> 	mov	cl, dl ; column count * 2
  3084 0000D028 B2A0                <1> 	mov	dl, 80*2
  3085 0000D02A 58                  <1> 	pop	eax ; *** (swap address)
  3086 0000D02B 5E                  <1> 	pop	esi ; ****
  3087 0000D02C FEC7                <1> 	inc	bh
  3088                              <1> 	
  3089                              <1> 	;mov	edx, 80*2
  3090 0000D02E B2A0                <1> 	mov	dl, 80*2
  3091                              <1> 	;
  3092 0000D030 80FB01              <1> 	cmp	bl, 1
  3093 0000D033 7735                <1> 	ja	short sysvideo_11
  3094                              <1> 
  3095                              <1> 	; user to system video/display page window transfer (mode 0)	
  3096 0000D035 21C0                <1> 	and	eax, eax ; swap address
  3097 0000D037 7413                <1> 	jz	short sysvideo_10 ; no window swap
  3098                              <1> 	; save previous window content in user's buffer (swap address)
  3099 0000D039 56                  <1> 	push	esi ; user buffer
  3100 0000D03A 57                  <1> 	push	edi ; beginning address of the window
  3101 0000D03B 89FE                <1> 	mov	esi, edi
  3102 0000D03D 89C7                <1> 	mov	edi, eax
  3103 0000D03F E888170000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3104 0000D044 5F                  <1> 	pop	edi
  3105 0000D045 5E                  <1> 	pop	esi
  3106 0000D046 0F82C3F3FFFF        <1> 	jc	sysret
  3107                              <1> sysvideo_10: 
  3108                              <1> 	; user to system video/display page window transfer (mode 0)	
  3109                              <1> 	; esi =	user buffer
  3110 0000D04C E8C5170000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3111 0000D051 0F82B8F3FFFF        <1> 	jc	sysret
  3112 0000D057 010D[005D0100]      <1> 	add	[u.r0], ecx
  3113 0000D05D 01D7                <1> 	add	edi, edx ; next row
  3114 0000D05F 01CE                <1> 	add	esi, ecx
  3115 0000D061 FECF                <1> 	dec	bh
  3116 0000D063 75E7                <1> 	jnz	short sysvideo_10
  3117 0000D065 E9A5F3FFFF          <1> 	jmp	sysret
  3118                              <1> 	
  3119                              <1> sysvideo_11:
  3120                              <1> 	; system to user video/display page window transfer (mode 0)
  3121 0000D06A 87FE                <1> 	xchg	edi, esi
  3122                              <1> sysvideo_12:
  3123                              <1> 	; esi = beginning address of the window
  3124                              <1> 	; edi =	user buffer	
  3125 0000D06C E85B170000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3126 0000D071 0F8298F3FFFF        <1> 	jc	sysret
  3127 0000D077 010D[005D0100]      <1> 	add	[u.r0], ecx
  3128 0000D07D 01D6                <1> 	add	esi, edx ; next row
  3129 0000D07F 01CF                <1> 	add	edi, ecx
  3130 0000D081 FECF                <1> 	dec	bh
  3131 0000D083 75E7                <1> 	jnz	short sysvideo_12
  3132 0000D085 E985F3FFFF          <1> 	jmp	sysret
  3133                              <1> 
  3134                              <1> sysvideo_13:
  3135 0000D08A 80FF01              <1> 	cmp	bh, 1
  3136 0000D08D 0F871F030000        <1>         ja      sysvideo_38
  3137                              <1> 	; BH = 1 = CGA Graphics (0B8000h) data transfers
  3138                              <1> 
  3139 0000D093 20DB                <1> 	and	bl, bl
  3140 0000D095 751A                <1> 	jnz	short sysvideo_14
  3141                              <1> 
  3142                              <1> 	; BL =	0 = Fill color (color in CL] (32K)
  3143                              <1> 
  3144 0000D097 88C8                <1> 	mov	al, cl
  3145 0000D099 B900800000          <1> 	mov	ecx, 32768
  3146 0000D09E 66890D[005D0100]    <1> 	mov	[u.r0], cx
  3147 0000D0A5 BF00800B00          <1> 	mov	edi, 0B8000h
  3148 0000D0AA F3AB                <1> 	rep	stosd
  3149 0000D0AC E95EF3FFFF          <1> 	jmp	sysret
  3150                              <1> 
  3151                              <1> sysvideo_14:
  3152 0000D0B1 80FB01              <1> 	cmp	bl, 1
  3153 0000D0B4 7723                <1> 	ja	short sysvideo_16
  3154                              <1> 
  3155 0000D0B6 89CE                <1> 	mov	esi, ecx ; user buffer
  3156                              <1> 	; BL = 1 = user to system video/display page transfer
  3157                              <1> sysvideo_15:	
  3158 0000D0B8 BF00800B00          <1> 	mov	edi, 0B8000h
  3159                              <1> 	; edi = video page address
  3160 0000D0BD B900800000          <1> 	mov	ecx, 32768
  3161 0000D0C2 E84F170000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3162 0000D0C7 0F8242F3FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3163 0000D0CD 66890D[005D0100]    <1> 	mov	[u.r0], cx		
  3164 0000D0D4 E936F3FFFF          <1> 	jmp	sysret
  3165                              <1> 
  3166                              <1> sysvideo_16:
  3167 0000D0D9 80FB02              <1> 	cmp	bl, 2	
  3168 0000D0DC 7723                <1> 	ja	short sysvideo_18
  3169                              <1> 
  3170 0000D0DE 89CF                <1> 	mov	edi, ecx ; user buffer
  3171                              <1> 	; BL = 2 = system to user video/display page transfer
  3172                              <1> sysvideo_17:	
  3173 0000D0E0 BE00800B00          <1> 	mov	esi, 0B8000h
  3174 0000D0E5 B900800000          <1> 	mov	ecx, 32768
  3175 0000D0EA E8DD160000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3176 0000D0EF 0F821AF3FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3177 0000D0F5 66890D[005D0100]    <1> 	mov	[u.r0], cx
  3178 0000D0FC E90EF3FFFF          <1> 	jmp	sysret 	
  3179                              <1> 
  3180                              <1> sysvideo_18:
  3181 0000D101 80FB03              <1> 	cmp	bl, 3
  3182 0000D104 777E                <1> 	ja	short sysvideo_23
  3183                              <1> 
  3184                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  3185                              <1> 
  3186 0000D106 BF00800B00          <1> 	mov	edi, 0B8000h
  3187 0000D10B 89FE                <1> 	mov	esi, edi
  3188                              <1> 	
  3189 0000D10D 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3190 0000D10F 7716                <1> 	ja	short sysvideo_20 ; window
  3191                              <1> 	; full screen (update)
  3192 0000D111 B900800000          <1> 	mov	ecx, 32768
  3193 0000D116 66890D[005D0100]    <1> 	mov	[u.r0], cx
  3194                              <1> sysvideo_19:
  3195 0000D11D F616                <1> 	not	byte [esi] ; NOT operation
  3196 0000D11F 46                  <1> 	inc	esi
  3197 0000D120 E2FB                <1> 	loop	sysvideo_19
  3198 0000D122 E9E8F2FFFF          <1> 	jmp	sysret
  3199                              <1> sysvideo_20:
  3200 0000D127 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3201 0000D12A 6629C8              <1> 	sub	ax, cx  ; - top left column
  3202 0000D12D 0F82DCF2FFFF        <1>         jb      sysret ; invalid
  3203 0000D133 6640                <1> 	inc	ax ; same column no == 1 column	 
  3204 0000D135 50                  <1> 	push	eax ; byte count per window row
  3205 0000D136 52                  <1> 	push	edx
  3206 0000D137 BB40010000          <1> 	mov	ebx, 320 ; screen width
  3207 0000D13C 89C8                <1> 	mov	eax, ecx
  3208 0000D13E C1E810              <1> 	shr	eax, 16  ; top row
  3209 0000D141 F7E3                <1> 	mul	ebx
  3210 0000D143 6689CA              <1> 	mov	dx, cx ; top left column
  3211 0000D146 01D0                <1> 	add	eax, edx
  3212 0000D148 01C6                <1> 	add	esi, eax ; start address 
  3213 0000D14A 59                  <1> 	pop	ecx ; edx
  3214 0000D14B 89C8                <1> 	mov	eax, ecx
  3215 0000D14D C1E810              <1> 	shr	eax, 16 ; bottom row
  3216 0000D150 F7E3                <1> 	mul	ebx
  3217 0000D152 6689CA              <1> 	mov	dx, cx ; bottom right column
  3218 0000D155 01D0                <1> 	add	eax, edx
  3219 0000D157 01C7                <1> 	add	edi, eax ; stop address (included)
  3220 0000D159 5A                  <1> 	pop	edx ; byte count per window row
  3221 0000D15A 81FFFFFF0B00        <1> 	cmp	edi, 0BFFFFh
  3222 0000D160 0F87A9F2FFFF        <1> 	ja	sysret	
  3223 0000D166 56                  <1> 	push	esi
  3224 0000D167 4E                  <1> 	dec	esi
  3225                              <1> sysvideo_21:
  3226 0000D168 89D1                <1> 	mov	ecx, edx
  3227                              <1> sysvideo_22:
  3228 0000D16A 46                  <1> 	inc	esi
  3229 0000D16B F616                <1> 	not	byte [esi]
  3230 0000D16D E2FB                <1> 	loop	sysvideo_22
  3231 0000D16F 01DE                <1> 	add	esi, ebx ; bytes per screen row
  3232                              <1> 	;
  3233 0000D171 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  3234 0000D173 76F3                <1> 	jna	short sysvideo_21
  3235 0000D175 5E                  <1> 	pop	esi
  3236 0000D176 29F7                <1> 	sub	edi, esi
  3237 0000D178 66893D[005D0100]    <1> 	mov	[u.r0], di
  3238 0000D17F E98BF2FFFF          <1> 	jmp	sysret
  3239                              <1> 
  3240                              <1> sysvideo_23:
  3241 0000D184 80FB04              <1> 	cmp	bl, 4
  3242 0000D187 0F87A7000000        <1>         ja      sysvideo_26
  3243                              <1> 
  3244                              <1> 	; BL = 4 = window copy (system to system)
  3245                              <1> 
  3246 0000D18D B800800B00          <1> 	mov	eax, 0B8000h
  3247 0000D192 39C6                <1> 	cmp	esi, eax
  3248 0000D194 0F8275F2FFFF        <1> 	jb	sysret
  3249 0000D19A 39C7                <1> 	cmp	edi, eax
  3250 0000D19C 0F826DF2FFFF        <1> 	jb	sysret
  3251 0000D1A2 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3252 0000D1A6 39C6                <1> 	cmp	esi, eax
  3253 0000D1A8 0F8761F2FFFF        <1> 	ja	sysret
  3254 0000D1AE 39C7                <1> 	cmp	edi, eax
  3255 0000D1B0 0F8759F2FFFF        <1> 	ja	sysret
  3256                              <1> 	
  3257 0000D1B6 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3258 0000D1B8 7714                <1> 	ja	short sysvideo_24 ; window
  3259                              <1> 	; full screen copy
  3260 0000D1BA 89C1                <1> 	mov	ecx, eax
  3261 0000D1BC 29F9                <1> 	sub	ecx, edi
  3262 0000D1BE 6641                <1> 	inc	cx
  3263 0000D1C0 66890D[005D0100]    <1> 	mov	[u.r0], cx
  3264 0000D1C7 F3A4                <1> 	rep	movsb
  3265 0000D1C9 E941F2FFFF          <1> 	jmp	sysret
  3266                              <1> sysvideo_24:
  3267 0000D1CE 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3268 0000D1D1 6629C8              <1> 	sub	ax, cx  ; - top left column
  3269 0000D1D4 0F8235F2FFFF        <1>         jb      sysret ; invalid
  3270 0000D1DA 6640                <1> 	inc	ax ; same column no == 1 column	 
  3271 0000D1DC 50                  <1> 	push	eax ; byte count per window row
  3272                              <1> 	;
  3273 0000D1DD 52                  <1> 	push	edx
  3274 0000D1DE BB40010000          <1> 	mov	ebx, 320 ; screen width
  3275 0000D1E3 89C8                <1> 	mov	eax, ecx
  3276 0000D1E5 C1E810              <1> 	shr	eax, 16	; top row
  3277 0000D1E8 F7E3                <1> 	mul	ebx
  3278 0000D1EA 6689CA              <1> 	mov	dx, cx ; top left column
  3279 0000D1ED 01D0                <1> 	add	eax, edx
  3280 0000D1EF 01C7                <1> 	add	edi, eax ; start address 
  3281 0000D1F1 01C6                <1> 	add	esi, eax
  3282 0000D1F3 59                  <1> 	pop	ecx ; edx
  3283 0000D1F4 89C8                <1> 	mov	eax, ecx
  3284 0000D1F6 C1E810              <1> 	shr	eax, 16 ; bottom row
  3285 0000D1F9 F7E3                <1> 	mul	ebx
  3286 0000D1FB 6689CA              <1> 	mov	dx, cx ; bottom right column
  3287 0000D1FE 01D0                <1> 	add	eax, edx
  3288 0000D200 5A                  <1> 	pop	edx ; byte count per window row
  3289 0000D201 0500800B00          <1> 	add	eax, 0B8000h
  3290 0000D206 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3291 0000D20B 0F87FEF1FFFF        <1> 	ja	sysret
  3292 0000D211 57                  <1> 	push	edi ; start address 
  3293 0000D212 50                  <1> 	push	eax ; stop address (included)
  3294                              <1> sysvideo_25:
  3295 0000D213 89D1                <1> 	mov	ecx, edx
  3296 0000D215 F3A4                <1> 	rep	movsb
  3297 0000D217 4F                  <1> 	dec	edi
  3298 0000D218 4E                  <1> 	dec	esi
  3299 0000D219 01DF                <1> 	add	edi, ebx ; bytes per screen row
  3300 0000D21B 01DE                <1> 	add	esi, ebx
  3301                              <1> 	;
  3302 0000D21D 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3303 0000D220 76F1                <1> 	jna	short sysvideo_25
  3304 0000D222 5B                  <1> 	pop	ebx ; stop address
  3305 0000D223 5F                  <1> 	pop	edi ; start address
  3306 0000D224 29FB                <1> 	sub	ebx, edi
  3307 0000D226 6643                <1> 	inc	bx
  3308 0000D228 66891D[005D0100]    <1> 	mov	[u.r0], bx	
  3309 0000D22F E9DBF1FFFF          <1> 	jmp	sysret
  3310                              <1> 
  3311                              <1> sysvideo_26:
  3312 0000D234 80FB05              <1> 	cmp	bl, 5
  3313 0000D237 0F8795000000        <1>         ja      sysvideo_29
  3314                              <1> 
  3315                              <1> 	; BL = 5 = window copy (user to system)
  3316                              <1> 
  3317 0000D23D B800800B00          <1> 	mov	eax, 0B8000h
  3318 0000D242 39C7                <1> 	cmp	edi, eax
  3319 0000D244 0F82C5F1FFFF        <1> 	jb	sysret
  3320 0000D24A 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3321 0000D24E 39C7                <1> 	cmp	edi, eax
  3322 0000D250 0F87B9F1FFFF        <1> 	ja	sysret
  3323                              <1> 
  3324                              <1> 	; esi = user buffer (in user's memory space)
  3325 0000D256 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3326 0000D258 0F865AFEFFFF        <1>         jna     sysvideo_15 ; full screen copy
  3327                              <1> 
  3328 0000D25E 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3329 0000D261 6629C8              <1> 	sub	ax, cx  ; - top left column
  3330 0000D264 0F82A5F1FFFF        <1>         jb      sysret ; invalid
  3331 0000D26A 6640                <1> 	inc	ax ; same column no == 1 column	 
  3332 0000D26C 50                  <1> 	push	eax ; byte count per window row
  3333                              <1> 
  3334 0000D26D 52                  <1> 	push	edx
  3335 0000D26E BB40010000          <1> 	mov	ebx, 320 ; screen width
  3336 0000D273 89C8                <1> 	mov	eax, ecx
  3337 0000D275 C1E810              <1> 	shr	eax, 16	; top row
  3338 0000D278 F7E3                <1> 	mul	ebx
  3339 0000D27A 6689CA              <1> 	mov	dx, cx ; top left column
  3340 0000D27D 01D0                <1> 	add	eax, edx
  3341 0000D27F 01C7                <1> 	add	edi, eax ; start address 
  3342 0000D281 59                  <1> 	pop	ecx ; edx
  3343 0000D282 89C8                <1> 	mov	eax, ecx
  3344 0000D284 C1E810              <1> 	shr	eax, 16 ; bottom row
  3345 0000D287 F7E3                <1> 	mul	ebx
  3346 0000D289 6689CA              <1> 	mov	dx, cx ; bottom right column
  3347 0000D28C 01D0                <1> 	add	eax, edx
  3348 0000D28E 5A                  <1> 	pop	edx ; byte count per window row
  3349 0000D28F 0500800B00          <1> 	add	eax, 0B8000h
  3350 0000D294 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3351 0000D299 0F8770F1FFFF        <1> 	ja	sysret
  3352 0000D29F 57                  <1> 	push	edi ; start address 
  3353 0000D2A0 50                  <1> 	push	eax ; stop address (included)
  3354                              <1> sysvideo_27:
  3355 0000D2A1 89D1                <1> 	mov	ecx, edx ; byte count
  3356                              <1> 	; user to system video/display page window transfer
  3357                              <1> 	; esi =	user buffer
  3358 0000D2A3 E86E150000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3359 0000D2A8 7221                <1> 	jc	short sysvideo_28
  3360 0000D2AA 010D[005D0100]      <1> 	add	[u.r0], ecx
  3361 0000D2B0 01DF                <1> 	add	edi, ebx ; next row
  3362 0000D2B2 01CE                <1> 	add	esi, ecx
  3363 0000D2B4 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3364 0000D2B7 76E8                <1> 	jna	short sysvideo_27
  3365 0000D2B9 5B                  <1> 	pop	ebx ; stop address
  3366 0000D2BA 5F                  <1> 	pop	edi ; start address
  3367 0000D2BB 29FB                <1> 	sub	ebx, edi
  3368 0000D2BD 6643                <1> 	inc	bx
  3369 0000D2BF 66891D[005D0100]    <1> 	mov	[u.r0], bx	
  3370 0000D2C6 E944F1FFFF          <1> 	jmp	sysret
  3371                              <1> sysvideo_28:
  3372 0000D2CB 58                  <1> 	pop	eax
  3373 0000D2CC 5A                  <1> 	pop	edx
  3374 0000D2CD E93DF1FFFF          <1> 	jmp	sysret
  3375                              <1> 
  3376                              <1> sysvideo_29:
  3377 0000D2D2 80FB06              <1> 	cmp	bl, 6
  3378 0000D2D5 0F8797000000        <1>         ja      sysvideo_32
  3379                              <1> 
  3380                              <1> 	; BL = 6 = window copy (system to user)
  3381                              <1> 
  3382 0000D2DB 89F7                <1> 	mov	edi, esi ; user buffer
  3383                              <1> 
  3384 0000D2DD B800800B00          <1> 	mov	eax, 0B8000h
  3385 0000D2E2 39C6                <1> 	cmp	esi, eax
  3386 0000D2E4 0F8225F1FFFF        <1> 	jb	sysret
  3387 0000D2EA 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3388 0000D2EE 39C6                <1> 	cmp	esi, eax
  3389 0000D2F0 0F8719F1FFFF        <1> 	ja	sysret
  3390                              <1> 
  3391                              <1> 	; edi = user buffer (in user's memory space)
  3392 0000D2F6 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3393 0000D2F8 0F86E2FDFFFF        <1>         jna     sysvideo_17 ; full screen copy
  3394                              <1> 
  3395 0000D2FE 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3396 0000D301 6629C8              <1> 	sub	ax, cx  ; - top left column
  3397 0000D304 0F8205F1FFFF        <1>         jb      sysret ; invalid
  3398 0000D30A 6640                <1> 	inc	ax ; same column no == 1 column	 
  3399 0000D30C 50                  <1> 	push	eax ; byte count per window row
  3400                              <1> 
  3401 0000D30D 52                  <1> 	push	edx
  3402 0000D30E BB40010000          <1> 	mov	ebx, 320 ; screen width
  3403 0000D313 89C8                <1> 	mov	eax, ecx
  3404 0000D315 C1E810              <1> 	shr	eax, 16	; top row
  3405 0000D318 F7E3                <1> 	mul	ebx
  3406 0000D31A 6689CA              <1> 	mov	dx, cx ; top left column
  3407 0000D31D 01D0                <1> 	add	eax, edx
  3408 0000D31F 01C6                <1> 	add	esi, eax ; start address 
  3409 0000D321 59                  <1> 	pop	ecx ; edx
  3410 0000D322 89C8                <1> 	mov	eax, ecx
  3411 0000D324 C1E810              <1> 	shr	eax, 16 ; bottom row
  3412 0000D327 F7E3                <1> 	mul	ebx
  3413 0000D329 6689CA              <1> 	mov	dx, cx ; bottom right column
  3414 0000D32C 01D0                <1> 	add	eax, edx
  3415 0000D32E 5A                  <1> 	pop	edx ; byte count per window row
  3416 0000D32F 0500800B00          <1> 	add	eax, 0B8000h
  3417 0000D334 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3418 0000D339 0F87D0F0FFFF        <1> 	ja	sysret
  3419 0000D33F 56                  <1> 	push	esi ; start address 
  3420 0000D340 50                  <1> 	push	eax ; stop address (included)
  3421                              <1> sysvideo_30:
  3422 0000D341 89D1                <1> 	mov	ecx, edx ; byte count
  3423                              <1> 	; user to system video/display page window transfer
  3424                              <1> 	; esi =	user buffer
  3425 0000D343 E884140000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3426 0000D348 7221                <1> 	jc	short sysvideo_31
  3427 0000D34A 010D[005D0100]      <1> 	add	[u.r0], ecx
  3428 0000D350 01DF                <1> 	add	edi, ebx ; next row
  3429 0000D352 01CE                <1> 	add	esi, ecx
  3430 0000D354 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3431 0000D357 76E8                <1> 	jna	short sysvideo_30
  3432 0000D359 5B                  <1> 	pop	ebx ; stop address
  3433 0000D35A 5F                  <1> 	pop	edi ; start address
  3434 0000D35B 29FB                <1> 	sub	ebx, edi
  3435 0000D35D 6643                <1> 	inc	bx
  3436 0000D35F 66891D[005D0100]    <1> 	mov	[u.r0], bx	
  3437 0000D366 E9A4F0FFFF          <1> 	jmp	sysret
  3438                              <1> sysvideo_31:
  3439 0000D36B 58                  <1> 	pop	eax
  3440 0000D36C 5A                  <1> 	pop	edx
  3441 0000D36D E99DF0FFFF          <1> 	jmp	sysret
  3442                              <1> 
  3443                              <1> sysvideo_32:
  3444 0000D372 80FB07              <1> 	cmp	bl, 7
  3445 0000D375 770F                <1> 	ja	short sysvideo_34
  3446                              <1> 
  3447                              <1> 	; BL = 7 = AND display page bytes with CL
  3448                              <1> 
  3449 0000D377 BE00800B00          <1> 	mov	esi, 0B8000h
  3450 0000D37C B900800000          <1> 	mov	ecx, 32768
  3451                              <1> sysvideo_33:
  3452 0000D381 200E                <1> 	and	byte [esi], cl
  3453 0000D383 46                  <1> 	inc	esi
  3454 0000D384 E2FB                <1> 	loop	sysvideo_33
  3455                              <1> 
  3456                              <1> sysvideo_34:
  3457 0000D386 80FB08              <1> 	cmp	bl, 8
  3458 0000D389 770F                <1> 	ja	short sysvideo_36
  3459                              <1> 
  3460                              <1> 	; BL = 8 = OR display page bytes with CL
  3461                              <1> 
  3462 0000D38B BE00800B00          <1> 	mov	esi, 0B8000h
  3463 0000D390 B900800000          <1> 	mov	ecx, 32768
  3464                              <1> sysvideo_35:
  3465 0000D395 080E                <1> 	or	byte [esi], cl
  3466 0000D397 46                  <1> 	inc	esi
  3467 0000D398 E2FB                <1> 	loop	sysvideo_35	
  3468                              <1> 
  3469                              <1> sysvideo_36:
  3470 0000D39A 80FB09              <1> 	cmp	bl, 9
  3471 0000D39D 0F876CF0FFFF        <1>         ja      sysret ; nothing to do
  3472                              <1> 
  3473                              <1> 	; BL = 9 = XOR display page bytes with CL
  3474                              <1> 
  3475 0000D3A3 BE00800B00          <1> 	mov	esi, 0B8000h
  3476 0000D3A8 B900800000          <1> 	mov	ecx, 32768
  3477                              <1> sysvideo_37:
  3478 0000D3AD 300E                <1> 	xor	byte [esi], cl
  3479 0000D3AF 46                  <1> 	inc	esi
  3480 0000D3B0 E2FB                <1> 	loop	sysvideo_37
  3481                              <1> 
  3482                              <1> sysvideo_38:
  3483 0000D3B2 80FF02              <1> 	cmp	bh, 2
  3484 0000D3B5 0F8733030000        <1>         ja      sysvideo_64
  3485                              <1> 	; BH = 2 = VGA Graphics (0A0000h) data transfers
  3486                              <1> 
  3487 0000D3BB 88DC                <1> 	mov	ah, bl
  3488 0000D3BD 80E30F              <1> 	and	bl, 0Fh	
  3489 0000D3C0 C0EC04              <1> 	shr	ah, 4
  3490 0000D3C3 C1E310              <1> 	shl	ebx, 16
  3491 0000D3C6 66BB4001            <1> 	mov	bx, 320 ; 320*200, 320*240
  3492 0000D3CA 20E4                <1> 	and	ah, ah
  3493 0000D3CC 7413                <1> 	jz	short sysvideo_39
  3494 0000D3CE 66D1E3              <1> 	shl	bx, 1 ; 640*200, 640 * 400, 640*480
  3495 0000D3D1 80FC02              <1> 	cmp	ah, 2
  3496 0000D3D4 720B                <1> 	jb	short sysvideo_39 		
  3497 0000D3D6 0F8733F0FFFF        <1> 	ja	sysret ; invalid
  3498                              <1> 	; 800*600
  3499 0000D3DC 6681C3A000          <1> 	add	bx, 160 ; 800
  3500                              <1> sysvideo_39:
  3501 0000D3E1 C1CB10              <1> 	ror	ebx, 16
  3502                              <1> 		
  3503 0000D3E4 20DB                <1>  	and	bl, bl
  3504 0000D3E6 7519                <1> 	jnz	short sysvideo_40
  3505                              <1> 
  3506                              <1> 	; BL =	0 = Fill color (color in CL] (64K)
  3507                              <1> 
  3508 0000D3E8 88C8                <1> 	mov	al, cl
  3509 0000D3EA B900000100          <1> 	mov	ecx, 65536
  3510 0000D3EF 890D[005D0100]      <1> 	mov	[u.r0], ecx
  3511 0000D3F5 BF00000A00          <1> 	mov	edi, 0A0000h
  3512 0000D3FA F3AB                <1> 	rep	stosd
  3513 0000D3FC E90EF0FFFF          <1> 	jmp	sysret
  3514                              <1> 
  3515                              <1> sysvideo_40:
  3516 0000D401 80FB01              <1> 	cmp	bl, 1
  3517 0000D404 7722                <1> 	ja	short sysvideo_42
  3518                              <1> 
  3519 0000D406 89CE                <1> 	mov	esi, ecx ; user buffer
  3520                              <1> 	; BL = 1 = user to system video/display page transfer
  3521                              <1> sysvideo_41:	
  3522 0000D408 BF00000A00          <1> 	mov	edi, 0A0000h
  3523                              <1> 	; edi = video page address
  3524 0000D40D B900000100          <1> 	mov	ecx, 65536
  3525 0000D412 E8FF130000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3526 0000D417 0F82F2EFFFFF        <1> 	jc	sysret ; [u.r0] = 0
  3527 0000D41D 890D[005D0100]      <1> 	mov	[u.r0], ecx		
  3528 0000D423 E9E7EFFFFF          <1> 	jmp	sysret
  3529                              <1> 
  3530                              <1> sysvideo_42:
  3531 0000D428 80FB02              <1> 	cmp	bl, 2	
  3532 0000D42B 7722                <1> 	ja	short sysvideo_44
  3533                              <1> 
  3534 0000D42D 89CF                <1> 	mov	edi, ecx ; user buffer
  3535                              <1> 	; BL = 2 = system to user video/display page transfer
  3536                              <1> sysvideo_43:	
  3537 0000D42F BE00000A00          <1> 	mov	esi, 0A0000h
  3538 0000D434 B900000100          <1> 	mov	ecx, 65536
  3539 0000D439 E88E130000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3540 0000D43E 0F82CBEFFFFF        <1> 	jc	sysret ; [u.r0] = 0
  3541 0000D444 890D[005D0100]      <1> 	mov	[u.r0], ecx
  3542 0000D44A E9C0EFFFFF          <1> 	jmp	sysret 	
  3543                              <1> 
  3544                              <1> sysvideo_44:
  3545 0000D44F 80FB03              <1> 	cmp	bl, 3
  3546 0000D452 777A                <1> 	ja	short sysvideo_49
  3547                              <1> 
  3548                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  3549                              <1> 
  3550 0000D454 BF00000A00          <1> 	mov	edi, 0A0000h
  3551 0000D459 89FE                <1> 	mov	esi, edi
  3552                              <1> 	
  3553 0000D45B 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3554 0000D45D 770B                <1> 	ja	short sysvideo_45 ; window
  3555                              <1> 	; full screen (update)
  3556 0000D45F B900000100          <1> 	mov	ecx, 65536
  3557 0000D464 890D[005D0100]      <1> 	mov	[u.r0], ecx
  3558                              <1> sysvideo_45:
  3559 0000D46A F616                <1> 	not	byte [esi] ; NOT operation
  3560 0000D46C 46                  <1> 	inc	esi
  3561 0000D46D E2FB                <1> 	loop	sysvideo_45
  3562 0000D46F E99BEFFFFF          <1> 	jmp	sysret
  3563                              <1> sysvideo_46:
  3564 0000D474 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3565 0000D477 6629C8              <1> 	sub	ax, cx  ; - top left column
  3566 0000D47A 0F828FEFFFFF        <1>         jb      sysret ; invalid
  3567 0000D480 6640                <1> 	inc	ax ; same column no == 1 column	 
  3568 0000D482 50                  <1> 	push	eax ; byte count per window row
  3569 0000D483 52                  <1> 	push	edx
  3570 0000D484 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3571 0000D487 89C8                <1> 	mov	eax, ecx
  3572 0000D489 C1E810              <1> 	shr	eax, 16  ; top row
  3573 0000D48C F7E3                <1> 	mul	ebx
  3574 0000D48E 6689CA              <1> 	mov	dx, cx ; top left column
  3575 0000D491 01D0                <1> 	add	eax, edx
  3576 0000D493 01C6                <1> 	add	esi, eax ; start address 
  3577 0000D495 59                  <1> 	pop	ecx ; edx
  3578 0000D496 89C8                <1> 	mov	eax, ecx
  3579 0000D498 C1E810              <1> 	shr	eax, 16 ; bottom row
  3580 0000D49B F7E3                <1> 	mul	ebx
  3581 0000D49D 6689CA              <1> 	mov	dx, cx ; bottom right column
  3582 0000D4A0 01D0                <1> 	add	eax, edx
  3583 0000D4A2 01C7                <1> 	add	edi, eax ; stop address (included)
  3584 0000D4A4 5A                  <1> 	pop	edx ; byte count per window row
  3585 0000D4A5 81FFFFFF0A00        <1> 	cmp	edi, 0AFFFFh
  3586 0000D4AB 0F875EEFFFFF        <1> 	ja	sysret	
  3587 0000D4B1 56                  <1> 	push	esi
  3588 0000D4B2 4E                  <1> 	dec	esi
  3589                              <1> sysvideo_47:
  3590 0000D4B3 89D1                <1> 	mov	ecx, edx
  3591                              <1> sysvideo_48:
  3592 0000D4B5 46                  <1> 	inc	esi
  3593 0000D4B6 F616                <1> 	not	byte [esi]
  3594 0000D4B8 E2FB                <1> 	loop	sysvideo_48
  3595 0000D4BA 01DE                <1> 	add	esi, ebx ; bytes per screen row
  3596                              <1> 	;
  3597 0000D4BC 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  3598 0000D4BE 76F3                <1> 	jna	short sysvideo_47
  3599 0000D4C0 5E                  <1> 	pop	esi
  3600 0000D4C1 29F7                <1> 	sub	edi, esi
  3601 0000D4C3 893D[005D0100]      <1> 	mov	[u.r0], edi
  3602 0000D4C9 E941EFFFFF          <1> 	jmp	sysret
  3603                              <1> 
  3604                              <1> sysvideo_49:
  3605 0000D4CE 80FB04              <1> 	cmp	bl, 4
  3606 0000D4D1 0F87A1000000        <1>         ja      sysvideo_52
  3607                              <1> 
  3608                              <1> 	; BL = 4 = window copy (system to system)
  3609                              <1> 
  3610 0000D4D7 B800000A00          <1> 	mov	eax, 0A0000h
  3611 0000D4DC 39C6                <1> 	cmp	esi, eax
  3612 0000D4DE 0F822BEFFFFF        <1> 	jb	sysret
  3613 0000D4E4 39C7                <1> 	cmp	edi, eax
  3614 0000D4E6 0F8223EFFFFF        <1> 	jb	sysret
  3615 0000D4EC 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3616 0000D4F0 39C6                <1> 	cmp	esi, eax
  3617 0000D4F2 0F8717EFFFFF        <1> 	ja	sysret
  3618 0000D4F8 39C7                <1> 	cmp	edi, eax
  3619 0000D4FA 0F870FEFFFFF        <1> 	ja	sysret
  3620                              <1> 	
  3621 0000D500 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3622 0000D502 7712                <1> 	ja	short sysvideo_50 ; window
  3623                              <1> 	; full screen copy
  3624 0000D504 89C1                <1> 	mov	ecx, eax
  3625 0000D506 29F9                <1> 	sub	ecx, edi
  3626 0000D508 41                  <1> 	inc	ecx
  3627 0000D509 890D[005D0100]      <1> 	mov	[u.r0], ecx
  3628 0000D50F F3A4                <1> 	rep	movsb
  3629 0000D511 E9F9EEFFFF          <1> 	jmp	sysret
  3630                              <1> sysvideo_50:
  3631 0000D516 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3632 0000D519 6629C8              <1> 	sub	ax, cx  ; - top left column
  3633 0000D51C 0F82EDEEFFFF        <1>         jb      sysret ; invalid
  3634 0000D522 6640                <1> 	inc	ax ; same column no == 1 column	 
  3635 0000D524 50                  <1> 	push	eax ; byte count per window row
  3636                              <1> 	;
  3637 0000D525 52                  <1> 	push	edx
  3638 0000D526 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3639 0000D529 89C8                <1> 	mov	eax, ecx
  3640 0000D52B C1E810              <1> 	shr	eax, 16	; top row
  3641 0000D52E F7E3                <1> 	mul	ebx
  3642 0000D530 6689CA              <1> 	mov	dx, cx ; top left column
  3643 0000D533 01D0                <1> 	add	eax, edx
  3644 0000D535 01C7                <1> 	add	edi, eax ; start address 
  3645 0000D537 01C6                <1> 	add	esi, eax
  3646 0000D539 59                  <1> 	pop	ecx ; edx
  3647 0000D53A 89C8                <1> 	mov	eax, ecx
  3648 0000D53C C1E810              <1> 	shr	eax, 16 ; bottom row
  3649 0000D53F F7E3                <1> 	mul	ebx
  3650 0000D541 6689CA              <1> 	mov	dx, cx ; bottom right column
  3651 0000D544 01D0                <1> 	add	eax, edx
  3652 0000D546 5A                  <1> 	pop	edx ; byte count per window row
  3653 0000D547 0500000A00          <1> 	add	eax, 0A0000h
  3654 0000D54C 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3655 0000D551 0F87B8EEFFFF        <1> 	ja	sysret
  3656 0000D557 57                  <1> 	push	edi ; start address 
  3657 0000D558 50                  <1> 	push	eax ; stop address (included)
  3658                              <1> sysvideo_51:
  3659 0000D559 89D1                <1> 	mov	ecx, edx
  3660 0000D55B F3A4                <1> 	rep	movsb
  3661 0000D55D 4F                  <1> 	dec	edi
  3662 0000D55E 4E                  <1> 	dec	esi
  3663 0000D55F 01DF                <1> 	add	edi, ebx ; bytes per screen row
  3664 0000D561 01DE                <1> 	add	esi, ebx
  3665                              <1> 	;
  3666 0000D563 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3667 0000D566 76F1                <1> 	jna	short sysvideo_51
  3668 0000D568 5B                  <1> 	pop	ebx ; stop address
  3669 0000D569 5F                  <1> 	pop	edi ; start address
  3670 0000D56A 29FB                <1> 	sub	ebx, edi
  3671 0000D56C 43                  <1> 	inc	ebx
  3672 0000D56D 891D[005D0100]      <1> 	mov	[u.r0], ebx	
  3673 0000D573 E997EEFFFF          <1> 	jmp	sysret
  3674                              <1> 
  3675                              <1> sysvideo_52:
  3676 0000D578 80FB05              <1> 	cmp	bl, 5
  3677 0000D57B 0F8791000000        <1>         ja      sysvideo_55
  3678                              <1> 
  3679                              <1> 	; BL = 5 = window copy (user to system)
  3680                              <1> 
  3681 0000D581 B800000A00          <1> 	mov	eax, 0A0000h
  3682 0000D586 39C7                <1> 	cmp	edi, eax
  3683 0000D588 0F8281EEFFFF        <1> 	jb	sysret
  3684 0000D58E 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3685 0000D592 39C7                <1> 	cmp	edi, eax
  3686 0000D594 0F8775EEFFFF        <1> 	ja	sysret
  3687                              <1> 
  3688                              <1> 	; esi = user buffer (in user's memory space)
  3689 0000D59A 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3690 0000D59C 0F8666FEFFFF        <1>         jna     sysvideo_41 ; full screen copy
  3691                              <1> 
  3692 0000D5A2 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3693 0000D5A5 6629C8              <1> 	sub	ax, cx  ; - top left column
  3694 0000D5A8 0F8261EEFFFF        <1>         jb      sysret ; invalid
  3695 0000D5AE 6640                <1> 	inc	ax ; same column no == 1 column	 
  3696 0000D5B0 50                  <1> 	push	eax ; byte count per window row
  3697                              <1> 
  3698 0000D5B1 52                  <1> 	push	edx
  3699 0000D5B2 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3700 0000D5B5 89C8                <1> 	mov	eax, ecx
  3701 0000D5B7 C1E810              <1> 	shr	eax, 16	; top row
  3702 0000D5BA F7E3                <1> 	mul	ebx
  3703 0000D5BC 6689CA              <1> 	mov	dx, cx ; top left column
  3704 0000D5BF 01D0                <1> 	add	eax, edx
  3705 0000D5C1 01C7                <1> 	add	edi, eax ; start address 
  3706 0000D5C3 59                  <1> 	pop	ecx ; edx
  3707 0000D5C4 89C8                <1> 	mov	eax, ecx
  3708 0000D5C6 C1E810              <1> 	shr	eax, 16 ; bottom row
  3709 0000D5C9 F7E3                <1> 	mul	ebx
  3710 0000D5CB 6689CA              <1> 	mov	dx, cx ; bottom right column
  3711 0000D5CE 01D0                <1> 	add	eax, edx
  3712 0000D5D0 5A                  <1> 	pop	edx ; byte count per window row
  3713 0000D5D1 0500000A00          <1> 	add	eax, 0A0000h
  3714 0000D5D6 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3715 0000D5DB 0F872EEEFFFF        <1> 	ja	sysret
  3716 0000D5E1 57                  <1> 	push	edi ; start address 
  3717 0000D5E2 50                  <1> 	push	eax ; stop address (included)
  3718                              <1> sysvideo_53:
  3719 0000D5E3 89D1                <1> 	mov	ecx, edx ; byte count
  3720                              <1> 	; user to system video/display page window transfer
  3721                              <1> 	; esi =	user buffer
  3722 0000D5E5 E82C120000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3723 0000D5EA 721F                <1> 	jc	short sysvideo_54
  3724 0000D5EC 010D[005D0100]      <1> 	add	[u.r0], ecx
  3725 0000D5F2 01DF                <1> 	add	edi, ebx ; next row
  3726 0000D5F4 01CE                <1> 	add	esi, ecx
  3727 0000D5F6 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3728 0000D5F9 76E8                <1> 	jna	short sysvideo_53
  3729 0000D5FB 5B                  <1> 	pop	ebx ; stop address
  3730 0000D5FC 5F                  <1> 	pop	edi ; start address
  3731 0000D5FD 29FB                <1> 	sub	ebx, edi
  3732 0000D5FF 43                  <1> 	inc	ebx
  3733 0000D600 891D[005D0100]      <1> 	mov	[u.r0], ebx	
  3734 0000D606 E904EEFFFF          <1> 	jmp	sysret
  3735                              <1> sysvideo_54:
  3736 0000D60B 58                  <1> 	pop	eax
  3737 0000D60C 5A                  <1> 	pop	edx
  3738 0000D60D E9FDEDFFFF          <1> 	jmp	sysret
  3739                              <1> 
  3740                              <1> sysvideo_55:
  3741 0000D612 80FB06              <1> 	cmp	bl, 6
  3742 0000D615 0F8793000000        <1>         ja      sysvideo_58
  3743                              <1> 
  3744                              <1> 	; BL = 6 = window copy (system to user)
  3745                              <1> 
  3746 0000D61B 89F7                <1> 	mov	edi, esi ; user buffer
  3747                              <1> 
  3748 0000D61D B800000A00          <1> 	mov	eax, 0A0000h
  3749 0000D622 39C6                <1> 	cmp	esi, eax
  3750 0000D624 0F82E5EDFFFF        <1> 	jb	sysret
  3751 0000D62A 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3752 0000D62E 39C6                <1> 	cmp	esi, eax
  3753 0000D630 0F87D9EDFFFF        <1> 	ja	sysret
  3754                              <1> 
  3755                              <1> 	; edi = user buffer (in user's memory space)
  3756 0000D636 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3757 0000D638 0F86A2FAFFFF        <1>         jna     sysvideo_17 ; full screen copy
  3758                              <1> 
  3759 0000D63E 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3760 0000D641 6629C8              <1> 	sub	ax, cx  ; - top left column
  3761 0000D644 0F82C5EDFFFF        <1>         jb      sysret ; invalid
  3762 0000D64A 6640                <1> 	inc	ax ; same column no == 1 column	 
  3763 0000D64C 50                  <1> 	push	eax ; byte count per window row
  3764                              <1> 
  3765 0000D64D 52                  <1> 	push	edx
  3766 0000D64E C1EB10              <1> 	shr	ebx, 16 ; 320, 640,800 ; screen width
  3767 0000D651 89C8                <1> 	mov	eax, ecx
  3768 0000D653 C1E810              <1> 	shr	eax, 16	; top row
  3769 0000D656 F7E3                <1> 	mul	ebx
  3770 0000D658 6689CA              <1> 	mov	dx, cx ; top left column
  3771 0000D65B 01D0                <1> 	add	eax, edx
  3772 0000D65D 01C6                <1> 	add	esi, eax ; start address 
  3773 0000D65F 59                  <1> 	pop	ecx ; edx
  3774 0000D660 89C8                <1> 	mov	eax, ecx
  3775 0000D662 C1E810              <1> 	shr	eax, 16 ; bottom row
  3776 0000D665 F7E3                <1> 	mul	ebx
  3777 0000D667 6689CA              <1> 	mov	dx, cx ; bottom right column
  3778 0000D66A 01D0                <1> 	add	eax, edx
  3779 0000D66C 5A                  <1> 	pop	edx ; byte count per window row
  3780 0000D66D 0500000A00          <1> 	add	eax, 0A0000h
  3781 0000D672 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3782 0000D677 0F8792EDFFFF        <1> 	ja	sysret
  3783 0000D67D 56                  <1> 	push	esi ; start address 
  3784 0000D67E 50                  <1> 	push	eax ; stop address (included)
  3785                              <1> sysvideo_56:
  3786 0000D67F 89D1                <1> 	mov	ecx, edx ; byte count
  3787                              <1> 	; user to system video/display page window transfer
  3788                              <1> 	; esi =	user buffer
  3789 0000D681 E846110000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3790 0000D686 721F                <1> 	jc	short sysvideo_57
  3791 0000D688 010D[005D0100]      <1> 	add	[u.r0], ecx
  3792 0000D68E 01DF                <1> 	add	edi, ebx ; next row
  3793 0000D690 01CE                <1> 	add	esi, ecx
  3794 0000D692 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3795 0000D695 76E8                <1> 	jna	short sysvideo_56
  3796 0000D697 5B                  <1> 	pop	ebx ; stop address
  3797 0000D698 5F                  <1> 	pop	edi ; start address
  3798 0000D699 29FB                <1> 	sub	ebx, edi
  3799 0000D69B 43                  <1> 	inc	ebx
  3800 0000D69C 891D[005D0100]      <1> 	mov	[u.r0], ebx	
  3801 0000D6A2 E968EDFFFF          <1> 	jmp	sysret
  3802                              <1> sysvideo_57:
  3803 0000D6A7 58                  <1> 	pop	eax
  3804 0000D6A8 5A                  <1> 	pop	edx
  3805 0000D6A9 E961EDFFFF          <1> 	jmp	sysret
  3806                              <1> 
  3807                              <1> sysvideo_58:
  3808 0000D6AE 80FB07              <1> 	cmp	bl, 7
  3809 0000D6B1 770F                <1> 	ja	short sysvideo_60
  3810                              <1> 
  3811                              <1> 	; BL = 7 = AND display page bytes with CL
  3812                              <1> 
  3813 0000D6B3 BE00000A00          <1> 	mov	esi, 0A0000h
  3814 0000D6B8 B900000100          <1> 	mov	ecx, 65536
  3815                              <1> sysvideo_59:
  3816 0000D6BD 200E                <1> 	and	byte [esi], cl
  3817 0000D6BF 46                  <1> 	inc	esi
  3818 0000D6C0 E2FB                <1> 	loop	sysvideo_59
  3819                              <1> 
  3820                              <1> sysvideo_60:
  3821 0000D6C2 80FB08              <1> 	cmp	bl, 8
  3822 0000D6C5 770F                <1> 	ja	short sysvideo_62
  3823                              <1> 
  3824                              <1> 	; BL = 8 = OR display page bytes with CL
  3825                              <1> 
  3826 0000D6C7 BE00000A00          <1> 	mov	esi, 0A0000h
  3827 0000D6CC B900000100          <1> 	mov	ecx, 65536
  3828                              <1> sysvideo_61:
  3829 0000D6D1 080E                <1> 	or	byte [esi], cl
  3830 0000D6D3 46                  <1> 	inc	esi
  3831 0000D6D4 E2FB                <1> 	loop	sysvideo_61	
  3832                              <1> 
  3833                              <1> sysvideo_62:
  3834 0000D6D6 80FB09              <1> 	cmp	bl, 9
  3835 0000D6D9 0F8730EDFFFF        <1>         ja      sysret ; nothing to do
  3836                              <1> 
  3837                              <1> 	; BL = 9 = XOR display page bytes with CL
  3838                              <1> 
  3839 0000D6DF BE00000A00          <1> 	mov	esi, 0A0000h
  3840 0000D6E4 B900000100          <1> 	mov	ecx, 65536
  3841                              <1> sysvideo_63:
  3842 0000D6E9 300E                <1> 	xor	byte [esi], cl
  3843 0000D6EB 46                  <1> 	inc	esi
  3844 0000D6EC E2FB                <1> 	loop	sysvideo_63
  3845                              <1> 
  3846                              <1> sysvideo_64:
  3847 0000D6EE 80FF03              <1> 	cmp	bh, 3
  3848 0000D6F1 7460                <1> 	je	short sysvideo_68
  3849 0000D6F3 80FF04              <1> 	cmp	bh, 4
  3850 0000D6F6 771F                <1> 	ja	short sysvideo_65
  3851                              <1> 	
  3852                              <1> 	; BH = 4
  3853                              <1> 	; Direct User Access for CGA video memory.
  3854                              <1> 	; Setup user's page tables for direct access to 0B8000h.
  3855                              <1> 	;
  3856                              <1> 	; Permission checks are not implemented yet !
  3857                              <1> 	; (11/07/2016)
  3858                              <1> 
  3859 0000D6F8 B800800B00          <1> 	mov	eax, 0B8000h
  3860 0000D6FD B908000000          <1> 	mov	ecx, 8 ; 8 pages (8*4K=32K)
  3861 0000D702 E88D7FFFFF          <1> 	call	direct_memory_access	
  3862 0000D707 0F8202EDFFFF        <1> 	jc	sysret
  3863                              <1> 	; eax = 0B8000h if there is not an error
  3864 0000D70D A3[005D0100]        <1> 	mov	[u.r0], eax
  3865 0000D712 E9F8ECFFFF          <1> 	jmp	sysret
  3866                              <1> 
  3867                              <1> sysvideo_65:
  3868 0000D717 80FF05              <1> 	cmp	bh, 5
  3869 0000D71A 771F                <1> 	ja	short sysvideo_66
  3870                              <1> 
  3871                              <1> 	; BH = 5
  3872                              <1> 	; Direct User Access for VGA video memory.
  3873                              <1> 	; Setup user's page tables for direct access to 0A0000h.
  3874                              <1> 	;
  3875                              <1> 	; Permission checks are not implemented yet !
  3876                              <1> 	; (11/07/2016)
  3877                              <1> 
  3878 0000D71C B800000A00          <1> 	mov	eax, 0A0000h
  3879 0000D721 B910000000          <1> 	mov	ecx, 16 ; 16 pages (16*4K=64K)
  3880 0000D726 E8697FFFFF          <1> 	call	direct_memory_access	
  3881 0000D72B 0F82DEECFFFF        <1> 	jc	sysret
  3882                              <1> 	; eax = 0A0000h if there is not an error
  3883 0000D731 A3[005D0100]        <1> 	mov	[u.r0], eax
  3884 0000D736 E9D4ECFFFF          <1> 	jmp	sysret
  3885                              <1> 
  3886                              <1> sysvideo_66:
  3887 0000D73B 80FF06              <1> 	cmp	bh, 6
  3888 0000D73E 7705                <1> 	ja	short sysvideo_67
  3889                              <1> 	; BH = 6
  3890                              <1> 	; Direct User Access for (Super VGA) Linear Frame Buffer.
  3891                              <1> 	; Setup user's page tables for direct access to LFB.
  3892                              <1> 	;
  3893                              <1> 	; Not implemented yet !
  3894                              <1> 	; (11/07/2016)
  3895 0000D740 E9CAECFFFF          <1> 	jmp	sysret
  3896                              <1> 
  3897                              <1> sysvideo_67:
  3898 0000D745 80FF07              <1> 	cmp	bh, 7
  3899 0000D748 0F87C1ECFFFF        <1> 	ja	sysret ; invalid !
  3900                              <1> 
  3901                              <1> 	; BH = 7
  3902                              <1> 	; Get (Super/Extended VGA) Linear Frame Buffer info.
  3903                              <1> 	;
  3904                              <1> 	; Not implemented yet !
  3905                              <1> 	; (11/07/2016)
  3906 0000D74E E9BCECFFFF          <1> 	jmp	sysret
  3907                              <1> 
  3908                              <1> sysvideo_68:
  3909                              <1> 	; BH = 3
  3910                              <1> 	; Super VGA, LINEAR FRAME BUFFER data transfers
  3911                              <1> 	; Not implemented for yet ! (11/07/2016)
  3912 0000D753 E9B7ECFFFF          <1> 	jmp	sysret
  3913                              <1> 
  3914                              <1> syslink:
  3915                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  3916                              <1> 	; temporary !
  3917 0000D758 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  3918 0000D75D A3[645D0100]        <1>         mov     [u.error], eax
  3919 0000D762 A3[005D0100]        <1>         mov     [u.r0], eax 
  3920 0000D767 E983ECFFFF          <1> 	jmp	error
  3921                              <1> 
  3922                              <1> isdir:
  3923                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  3924                              <1> 	; 04/05/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  3925                              <1> 	;
  3926                              <1> 	; 'isdir' check to see if the i-node whose i-number is in r1
  3927                              <1> 	;  is a directory. If it is, an error occurs, because 'isdir'
  3928                              <1> 	;  called by syslink and sysunlink to make sure directories
  3929                              <1> 	;  are not linked. If the user is the super user (u.uid=0),
  3930                              <1> 	; 'isdir' does not bother checking. The current i-node
  3931                              <1> 	;  is not disturbed.			
  3932                              <1> 	;		
  3933                              <1> 	; INPUTS ->
  3934                              <1> 	;    r1 - contains the i-number whose i-node is being checked.
  3935                              <1> 	;    u.uid - user id
  3936                              <1> 	; OUTPUTS ->
  3937                              <1> 	;    r1 - contains current i-number upon exit
  3938                              <1> 	;    	 (current i-node back in core) 
  3939                              <1> 	;	
  3940                              <1> 	; ((AX = R1))
  3941                              <1> 	;
  3942                              <1>         ; ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
  3943                              <1> 	;
  3944                              <1> 
  3945                              <1> 	; / if the i-node whose i-number is in r1 is a directory 
  3946                              <1> 	; / there is an error unless super user made the call
  3947                              <1> 	
  3948 0000D76C 803D[4C5D0100]00    <1> 	cmp	byte [u.uid], 0 
  3949                              <1> 		; tstb u.uid / super user
  3950 0000D773 762D                <1> 	jna	short isdir1
  3951                              <1> 		; beq 1f / yes, don't care
  3952 0000D775 66FF35[ED5D0100]    <1> 	push	word [ii]
  3953                              <1> 		; mov ii,-(sp) / put current i-number on stack
  3954 0000D77C E84F190000          <1> 	call	iget
  3955                              <1> 		; jsr r0,iget / get i-node into core (i-number in r1)
  3956 0000D781 66F705[9C590100]00- <1> 	test 	word [i.flgs], 4000h ; Bit 14 : Directory flag
  3956 0000D789 40                  <1>
  3957                              <1> 		; bit $40000,i.flgs / is it a directory
  3958                              <1> 	;jnz	error
  3959                              <1> 		; bne error9 / yes, error
  3960 0000D78A 740F                <1> 	jz	short isdir0
  3961 0000D78C C705[645D0100]0B00- <1> 	mov 	dword [u.error], ERR_NOT_FILE  ; 11 ; ERR_DIR_ACCESS 
  3961 0000D794 0000                <1>
  3962                              <1> 				; 'permission denied !' error
  3963                              <1> 	; pop	ax
  3964 0000D796 E954ECFFFF          <1> 	jmp	error	
  3965                              <1> isdir0:	
  3966 0000D79B 6658                <1> 	pop	ax
  3967                              <1> 		; mov (sp)+,r1 / no, put current i-number in r1 (ii)
  3968 0000D79D E82E190000          <1> 	call	iget
  3969                              <1> 		; jsr r0,iget / get it back in
  3970                              <1> isdir1: ; 1:
  3971 0000D7A2 C3                  <1> 	retn
  3972                              <1> 		; rts r0
  3973                              <1> 
  3974                              <1> sysunlink:
  3975                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  3976                              <1> 	; temporary !
  3977 0000D7A3 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  3978 0000D7A8 A3[645D0100]        <1>         mov     [u.error], eax
  3979 0000D7AD A3[005D0100]        <1>         mov     [u.r0], eax 
  3980 0000D7B2 E938ECFFFF          <1> 	jmp	error
  3981                              <1> mkdir:
  3982                              <1> 	; 04/12/2015 (14 byte directory names)
  3983                              <1> 	; 12/10/2015
  3984                              <1> 	; 17/06/2015 (Retro UNIX 386 v1 - Beginning)
  3985                              <1> 	; 29/04/2013 - 01/08/2013 (Retro UNIX 8086 v1)
  3986                              <1> 	;
  3987                              <1> 	; 'mkdir' makes a directory entry from the name pointed to
  3988                              <1> 	; by u.namep into the current directory.
  3989                              <1> 	;
  3990                              <1> 	; INPUTS ->
  3991                              <1> 	;    u.namep - points to a file name 
  3992                              <1> 	;	           that is about to be a directory entry.
  3993                              <1> 	;    ii - current directory's i-number.	
  3994                              <1> 	; OUTPUTS ->
  3995                              <1> 	;    u.dirbuf+2 - u.dirbuf+10 - contains file name. 
  3996                              <1> 	;    u.off - points to entry to be filled 
  3997                              <1> 	;	     in the current directory		
  3998                              <1> 	;    u.base - points to start of u.dirbuf.
  3999                              <1> 	;    r1 - contains i-number of current directory 
  4000                              <1> 	;	
  4001                              <1> 	; ((AX = R1)) output
  4002                              <1> 	;
  4003                              <1> 	;    (Retro UNIX Prototype : 11/11/2012, UNIXCOPY.ASM)
  4004                              <1>         ;    ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
  4005                              <1> 	;
  4006                              <1> 
  4007                              <1> 	; 17/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
  4008 0000D7B7 31C0                <1> 	xor 	eax, eax
  4009 0000D7B9 BF[365D0100]        <1> 	mov     edi, u.dirbuf+2
  4010 0000D7BE 89FE                <1> 	mov	esi, edi
  4011 0000D7C0 AB                  <1> 	stosd
  4012 0000D7C1 AB                  <1> 	stosd
  4013                              <1> 	; 04/12/2015 (14 byte directory names)
  4014 0000D7C2 AB                  <1> 	stosd
  4015 0000D7C3 66AB                <1> 	stosw
  4016                              <1> 		; jsr r0,copyz; u.dirbuf+2; u.dirbuf+10. / clear this
  4017 0000D7C5 89F7                <1> 	mov	edi, esi ; offset to u.dirbuf
  4018                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
  4019                              <1> 	;mov 	ebp, [u.namep]
  4020 0000D7C7 E829040000          <1> 	call	trans_addr_nmbp ; convert virtual address to physical
  4021                              <1> 		; esi = physical address (page start + offset)
  4022                              <1> 		; ecx = byte count in the page (1 - 4096)
  4023                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
  4024                              <1> 		; mov u.namep,r2 / r2 points to name of directory entry
  4025                              <1> 		; mov $u.dirbuf+2,r3 / r3 points to u.dirbuf+2
  4026                              <1> mkdir_1: ; 1: 
  4027 0000D7CC 45                  <1> 	inc	ebp ; 12/10/2015
  4028                              <1> 	;
  4029                              <1> 	; / put characters in the directory name in u.dirbuf+2 - u.dirbuf+10
  4030                              <1> 	 ; 01/08/2013
  4031 0000D7CD AC                  <1> 	lodsb
  4032                              <1> 		; movb (r2)+,r1 / move character in name to r1
  4033 0000D7CE 20C0                <1> 	and 	al, al
  4034 0000D7D0 7427                <1> 	jz 	short mkdir_3 	  
  4035                              <1> 		; beq 1f / if null, done
  4036 0000D7D2 3C2F                <1> 	cmp	al, '/'
  4037                              <1> 		; cmp r1,$'/ / is it a "/"?
  4038 0000D7D4 7414                <1> 	je	short mkdir_err
  4039                              <1> 	;je	error
  4040                              <1> 		; beq error9 / yes, error
  4041                              <1> 	; 12/10/2015
  4042 0000D7D6 6649                <1> 	dec	cx
  4043 0000D7D8 7505                <1> 	jnz	short mkdir_2
  4044                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
  4045 0000D7DA E81C040000          <1> 	call	trans_addr_nm ; convert virtual address to physical
  4046                              <1> 		; esi = physical address (page start + offset)
  4047                              <1> 		; ecx = byte count in the page
  4048                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
  4049                              <1> mkdir_2:
  4050 0000D7DF 81FF[445D0100]      <1> 	cmp     edi, u.dirbuf+16 ; ; 04/12/2015 (10 -> 16) 
  4051                              <1> 		; cmp r3,$u.dirbuf+10. / have we reached the last slot for
  4052                              <1> 				     ; / a char?
  4053 0000D7E5 74E5                <1> 	je	short mkdir_1
  4054                              <1> 		; beq 1b / yes, go back
  4055 0000D7E7 AA                  <1> 	stosb
  4056                              <1> 		; movb r1,(r3)+ / no, put the char in the u.dirbuf
  4057 0000D7E8 EBE2                <1> 	jmp 	short mkdir_1
  4058                              <1> 		; br 1b / get next char
  4059                              <1> mkdir_err:
  4060                              <1> 	; 17/06/2015
  4061 0000D7EA C705[645D0100]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a valid directory !'
  4061 0000D7F2 0000                <1>
  4062 0000D7F4 E9F6EBFFFF          <1> 	jmp	error
  4063                              <1> 
  4064                              <1> mkdir_3: ; 1:
  4065 0000D7F9 A1[145D0100]        <1> 	mov	eax, [u.dirp]
  4066 0000D7FE A3[1C5D0100]        <1> 	mov	[u.off], eax
  4067                              <1> 		; mov u.dirp,u.off / pointer to empty current directory
  4068                              <1> 				 ; / slot to u.off
  4069                              <1> wdir: ; 29/04/2013
  4070 0000D803 C705[205D0100]-     <1>         mov     dword [u.base], u.dirbuf
  4070 0000D809 [345D0100]          <1>
  4071                              <1> 		; mov $u.dirbuf,u.base / u.base points to created file name
  4072 0000D80D C705[245D0100]1000- <1>         mov     dword [u.count], 16 ; 04/12/2015 (10 -> 16) 
  4072 0000D815 0000                <1>
  4073                              <1> 		; mov $10.,u.count / u.count = 10
  4074 0000D817 66A1[ED5D0100]      <1> 	mov	ax, [ii] 
  4075                              <1> 		; mov ii,r1 / r1 has i-number of current directory
  4076 0000D81D B201                <1> 	mov	dl, 1 ; owner flag mask ; RETRO UNIX 8086 v1 modification !
  4077 0000D81F E8B2180000          <1> 	call 	access
  4078                              <1> 		; jsr r0,access; 1 / get i-node and set its file up 
  4079                              <1> 				 ; / for writing
  4080                              <1> 	; AX = i-number of current directory
  4081                              <1> 	; 01/08/2013
  4082 0000D824 FE05[625D0100]      <1> 	inc     byte [u.kcall] ; the caller is 'mkdir' sign	
  4083 0000D82A E8FF110000          <1> 	call	writei
  4084                              <1> 		; jsr r0,writei / write into directory
  4085 0000D82F C3                  <1> 	retn	
  4086                              <1> 		; rts r0
  4087                              <1> 
  4088                              <1> sysexec:
  4089                              <1> 	; 04/01/2017
  4090                              <1> 	; 24/10/2016
  4091                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
  4092                              <1> 	; 23/06/2015 - 23/10/2015 (Retro UNIX 386 v1)
  4093                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
  4094                              <1> 	;
  4095                              <1> 	; 'sysexec' initiates execution of a file whose path name if
  4096                              <1> 	; pointed to by 'name' in the sysexec call. 
  4097                              <1> 	; 'sysexec' performs the following operations:
  4098                              <1> 	;    1. obtains i-number of file to be executed via 'namei'.
  4099                              <1> 	;    2. obtains i-node of file to be exceuted via 'iget'.
  4100                              <1> 	;    3. sets trap vectors to system routines.
  4101                              <1> 	;    4. loads arguments to be passed to executing file into
  4102                              <1> 	;	highest locations of user's core
  4103                              <1> 	;    5. puts pointers to arguments in locations immediately
  4104                              <1> 	;	following arguments.
  4105                              <1> 	;    6.	saves number of arguments in next location.
  4106                              <1> 	;    7. intializes user's stack area so that all registers
  4107                              <1> 	;	will be zeroed and the PS is cleared and the PC set
  4108                              <1> 	;	to core when 'sysret' restores registers 
  4109                              <1> 	;	and does an rti.
  4110                              <1> 	;    8. inializes u.r0 and u.sp
  4111                              <1> 	;    9. zeros user's core down to u.r0
  4112                              <1> 	;   10.	reads executable file from storage device into core
  4113                              <1> 	;	starting at location 'core'.
  4114                              <1> 	;   11.	sets u.break to point to end of user's code with
  4115                              <1> 	;	data area appended.
  4116                              <1> 	;   12.	calls 'sysret' which returns control at location
  4117                              <1> 	;	'core' via 'rti' instruction. 		  		
  4118                              <1> 	;
  4119                              <1> 	; Calling sequence:
  4120                              <1> 	;	sysexec; namep; argp
  4121                              <1> 	; Arguments:
  4122                              <1> 	;	namep - points to pathname of file to be executed
  4123                              <1> 	;	argp  - address of table of argument pointers
  4124                              <1> 	;	argp1... argpn - table of argument pointers
  4125                              <1> 	;	argp1:<...0> ... argpn:<...0> - argument strings
  4126                              <1> 	; Inputs: (arguments)
  4127                              <1> 	; Outputs: -	
  4128                              <1> 	; ...............................................................
  4129                              <1> 	;
  4130                              <1> 	; Retro UNIX 386 v1 modification: 
  4131                              <1> 	;	User application runs in it's own virtual space 
  4132                              <1> 	;	which is izolated from kernel memory (and other
  4133                              <1> 	;	memory pages) via 80386	paging in ring 3 
  4134                              <1> 	;	privilige mode. Virtual start address is always 0.
  4135                              <1> 	;	User's core memory starts at linear address 400000h
  4136                              <1> 	;	(the end of the 1st 4MB).
  4137                              <1> 	;
  4138                              <1> 	; Retro UNIX 8086 v1 modification: 
  4139                              <1> 	;	user/application segment and system/kernel segment
  4140                              <1> 	;	are different and sysenter/sysret/sysrele routines
  4141                              <1> 	;	are different (user's registers are saved to 
  4142                              <1> 	;	and then restored from system's stack.)
  4143                              <1> 	;
  4144                              <1> 	;	NOTE: Retro UNIX 8086 v1 'arg2' routine gets these
  4145                              <1> 	;	      arguments which were in these registers;
  4146                              <1> 	;	      but, it returns by putting the 1st argument
  4147                              <1> 	;	      in 'u.namep' and the 2nd argument
  4148                              <1> 	;	      on top of stack. (1st argument is offset of the
  4149                              <1> 	;	      file/path name in the user's program segment.)		 	
  4150                              <1> 	
  4151                              <1> 	;call	arg2
  4152                              <1> 	; * name - 'u.namep' points to address of file/path name
  4153                              <1> 	;          in the user's program segment ('u.segmnt')
  4154                              <1> 	;          with offset in BX register (as sysopen argument 1).
  4155                              <1> 	; * argp - sysexec argument 2 is in CX register 
  4156                              <1> 	;          which is on top of stack.
  4157                              <1> 	;
  4158                              <1> 		; jsr r0,arg2 / arg0 in u.namep,arg1 on top of stack
  4159                              <1> 
  4160                              <1> 	; 23/06/2015 (32 bit modifications)
  4161                              <1> 
  4162 0000D830 891D[185D0100]      <1> 	mov	[u.namep], ebx ; argument 1
  4163                              <1>         ; 18/10/2015
  4164 0000D836 890D[E85D0100]      <1> 	mov     [argv], ecx  ; * ; argument 2
  4165 0000D83C E86F020000          <1> 	call	namei
  4166                              <1> 		; jsr r0,namei / namei returns i-number of file 
  4167                              <1> 			     ; / named in sysexec call in r1
  4168                              <1> 	;jc	error
  4169                              <1> 		; br error9
  4170 0000D841 731E                <1> 	jnc	short sysexec_0
  4171                              <1> 	;
  4172                              <1> 	; 'file not found !' error
  4173 0000D843 C705[645D0100]0C00- <1> 	mov	dword [u.error], ERR_FILE_NOT_FOUND
  4173 0000D84B 0000                <1>
  4174 0000D84D E99DEBFFFF          <1> 	jmp	error 
  4175                              <1> sysexec_not_exf:
  4176                              <1> 	; 'not executable file !' error
  4177 0000D852 C705[645D0100]1600- <1> 	mov	dword [u.error], ERR_NOT_EXECUTABLE
  4177 0000D85A 0000                <1>
  4178 0000D85C E98EEBFFFF          <1> 	jmp	error 
  4179                              <1> sysexec_0:
  4180 0000D861 E86A180000          <1> 	call	iget
  4181                              <1> 		; jsr r0,iget / get i-node for file to be executed
  4182 0000D866 66F705[9C590100]10- <1>         test    word [i.flgs], 10h
  4182 0000D86E 00                  <1>
  4183                              <1> 		; bit $20,i.flgs / is file executable
  4184 0000D86F 74E1                <1> 	jz	short sysexec_not_exf
  4185                              <1> 	;jz	error
  4186                              <1> 		; beq error9
  4187                              <1> 	;;
  4188 0000D871 E85C180000          <1> 	call	iopen
  4189                              <1> 		; jsr r0,iopen / gets i-node for file with i-number
  4190                              <1> 			     ; / given in r1 (opens file)
  4191                              <1> 	; AX = i-number of the file
  4192 0000D876 66F705[9C590100]20- <1> 	test	word [i.flgs], 20h
  4192 0000D87E 00                  <1>
  4193                              <1> 		; bit $40,i.flgs / test user id on execution bit
  4194 0000D87F 7415                <1> 	jz	short sysexec_1
  4195                              <1> 		; beq 1f
  4196 0000D881 803D[4C5D0100]00    <1> 	cmp 	byte [u.uid], 0 ; 02/08/2013
  4197                              <1> 		; tstb u.uid / test user id
  4198 0000D888 760C                <1> 	jna	short sysexec_1
  4199                              <1> 		; beq 1f / super user
  4200 0000D88A 8A0D[9F590100]      <1> 	mov	cl, [i.uid]
  4201 0000D890 880D[4C5D0100]      <1> 	mov	[u.uid], cl ; 02/08/2013
  4202                              <1> 		; movb i.uid,u.uid / put user id of owner of file
  4203                              <1> 				 ; / as process user id
  4204                              <1> sysexec_1:
  4205                              <1> 	; 18/10/2215
  4206                              <1> 	; 10/10/2015
  4207                              <1> 	; 24/07/2015
  4208                              <1> 	; 21/07/2015
  4209                              <1> 	; 25/06/2015
  4210                              <1> 	; 24/06/2015
  4211                              <1>         ; Moving arguments to the end of [u.upage]
  4212                              <1> 	; (by regarding page borders in user's memory space)
  4213                              <1> 	;
  4214                              <1> 	; 10/10/2015
  4215                              <1> 	; 21/07/2015
  4216 0000D896 89E5                <1> 	mov	ebp, esp ; (**)
  4217                              <1> 	; 18/10/2015
  4218 0000D898 89EF                <1> 	mov 	edi, ebp
  4219 0000D89A B900010000          <1> 	mov 	ecx, MAX_ARG_LEN ; 256
  4220                              <1> 	;sub	edi, MAX_ARG_LEN ; 256
  4221 0000D89F 29CF                <1> 	sub	edi, ecx
  4222 0000D8A1 89FC                <1> 	mov	esp, edi
  4223 0000D8A3 31C0                <1> 	xor	eax, eax
  4224 0000D8A5 A3[285D0100]        <1> 	mov 	[u.nread], eax ; 0
  4225 0000D8AA 49                  <1> 	dec	ecx ; 256 - 1
  4226 0000D8AB 890D[245D0100]      <1> 	mov 	[u.count], ecx ; MAX_ARG_LEN - 1 ; 255
  4227                              <1> 	;mov 	dword [u.count], MAX_ARG_LEN - 1 ; 255
  4228                              <1> sysexec_2:
  4229 0000D8B1 8B35[E85D0100]      <1> 	mov	esi, [argv] ; 18/10/2015 
  4230 0000D8B7 E866000000          <1> 	call	get_argp
  4231 0000D8BC B904000000          <1> 	mov	ecx, 4 ; mov ecx, 4
  4232                              <1> sysexec_3:
  4233 0000D8C1 21C0                <1> 	and	eax, eax
  4234 0000D8C3 0F84E3070000        <1>         jz      sysexec_6
  4235                              <1> 	; 18/10/2015
  4236 0000D8C9 010D[E85D0100]      <1> 	add	[argv], ecx ; 4
  4237 0000D8CF 66FF05[E65D0100]    <1> 	inc	word [argc]
  4238                              <1> 	;
  4239 0000D8D6 A3[205D0100]        <1> 	mov	[u.base], eax
  4240                              <1>  	; 23/10/2015
  4241 0000D8DB 66C705[605D0100]00- <1> 	mov	word [u.pcount], 0
  4241 0000D8E3 00                  <1>
  4242                              <1> sysexec_4:
  4243 0000D8E4 E8830E0000          <1> 	call	cpass ; get a character from user's core memory
  4244 0000D8E9 750E                <1>         jnz      short sysexec_5
  4245                              <1> 		; (max. 255 chars + null)
  4246                              <1> 	; 18/10/2015
  4247 0000D8EB 28C0                <1> 	sub 	al, al
  4248 0000D8ED AA                  <1> 	stosb
  4249 0000D8EE FF05[285D0100]      <1> 	inc	dword [u.nread]
  4250 0000D8F4 E9B3070000          <1> 	jmp	sysexec_6 ; 24/04/2016
  4251                              <1> sysexec_5:
  4252 0000D8F9 AA                  <1> 	stosb
  4253 0000D8FA 20C0                <1> 	and 	al, al
  4254 0000D8FC 75E6                <1> 	jnz	short sysexec_4
  4255 0000D8FE B904000000          <1> 	mov	ecx, 4
  4256 0000D903 390D[E45D0100]      <1> 	cmp	[ncount], ecx ; 4
  4257 0000D909 72A6                <1> 	jb	short sysexec_2
  4258 0000D90B 8B35[E05D0100]      <1> 	mov	esi, [nbase]
  4259 0000D911 010D[E05D0100]      <1> 	add	[nbase], ecx ; 4	
  4260 0000D917 66290D[E45D0100]    <1> 	sub	[ncount], cx 
  4261 0000D91E 8B06                <1> 	mov	eax, [esi]
  4262 0000D920 EB9F                <1> 	jmp	short sysexec_3
  4263                              <1> 
  4264                              <1> get_argp:
  4265                              <1> 	; 18/10/2015 (nbase, ncount)
  4266                              <1> 	; 21/07/2015
  4267                              <1> 	; 24/06/2015 (Retro UNIX 386 v1)
  4268                              <1> 	; Get (virtual) address of argument from user's core memory
  4269                              <1> 	;
  4270                              <1> 	; INPUT:
  4271                              <1> 	;	esi = virtual address of argument pointer
  4272                              <1> 	; OUTPUT:
  4273                              <1> 	;	eax = virtual address of argument
  4274                              <1> 	;
  4275                              <1> 	; Modified registers: EAX, EBX, ECX, EDX, ESI 
  4276                              <1> 	;
  4277 0000D922 833D[585D0100]00    <1>  	cmp     dword [u.ppgdir], 0 ; /etc/init ?
  4278                              <1> 				    ; (the caller is kernel)
  4279 0000D929 7667                <1>         jna     short get_argpk 
  4280                              <1> 	;
  4281 0000D92B 89F3                <1>      	mov	ebx, esi
  4282 0000D92D E85C79FFFF          <1> 	call	get_physical_addr ; get physical address
  4283 0000D932 0F8289000000        <1>         jc      get_argp_err
  4284 0000D938 A3[E05D0100]        <1> 	mov 	[nbase], eax ; physical address	
  4285 0000D93D 66890D[E45D0100]    <1> 	mov	[ncount], cx ; remain byte count in page (1-4096)
  4286 0000D944 B804000000          <1> 	mov	eax, 4 ; 21/07/2015
  4287 0000D949 6639C1              <1> 	cmp	cx, ax ; 4
  4288 0000D94C 735D                <1> 	jnb	short get_argp2
  4289 0000D94E 89F3                <1> 	mov	ebx, esi
  4290 0000D950 01CB                <1> 	add	ebx, ecx
  4291 0000D952 E83779FFFF          <1> 	call	get_physical_addr ; get physical address
  4292 0000D957 7268                <1> 	jc	short get_argp_err
  4293                              <1> 	;push	esi
  4294 0000D959 89C6                <1> 	mov	esi, eax
  4295 0000D95B 66870D[E45D0100]    <1> 	xchg	cx, [ncount]
  4296 0000D962 8735[E05D0100]      <1> 	xchg	esi, [nbase]
  4297 0000D968 B504                <1> 	mov	ch, 4
  4298 0000D96A 28CD                <1> 	sub	ch, cl
  4299                              <1> get_argp0:
  4300 0000D96C AC                  <1> 	lodsb
  4301 0000D96D 6650                <1> 	push	ax
  4302 0000D96F FEC9                <1> 	dec	cl
  4303 0000D971 75F9                <1>         jnz     short get_argp0
  4304 0000D973 8B35[E05D0100]      <1> 	mov	esi, [nbase]
  4305                              <1> 	; 21/07/2015
  4306 0000D979 0FB6C5              <1> 	movzx	eax, ch
  4307 0000D97C 0105[E05D0100]      <1> 	add	[nbase], eax
  4308 0000D982 662905[E45D0100]    <1> 	sub	[ncount], ax
  4309                              <1> get_argp1:
  4310 0000D989 AC                  <1> 	lodsb
  4311 0000D98A FECD                <1> 	dec	ch
  4312 0000D98C 743D                <1>         jz      short get_argp3
  4313 0000D98E 6650                <1>         push	ax
  4314 0000D990 EBF7                <1> 	jmp     short get_argp1
  4315                              <1> get_argpk:
  4316                              <1> 	; Argument is in kernel's memory space
  4317 0000D992 66C705[E45D0100]00- <1> 	mov	word [ncount], PAGE_SIZE ; 4096
  4317 0000D99A 10                  <1>
  4318 0000D99B 8935[E05D0100]      <1> 	mov	[nbase], esi
  4319 0000D9A1 8305[E05D0100]04    <1> 	add	dword [nbase], 4
  4320 0000D9A8 8B06                <1> 	mov	eax, [esi] ; virtual addr. = physcal addr.
  4321 0000D9AA C3                  <1> 	retn
  4322                              <1> get_argp2:
  4323                              <1> 	; 21/07/2015
  4324                              <1> 	;mov	eax, 4
  4325 0000D9AB 8B15[E05D0100]      <1> 	mov 	edx, [nbase] ; 18/10/2015
  4326 0000D9B1 0105[E05D0100]      <1> 	add	[nbase], eax
  4327 0000D9B7 662905[E45D0100]    <1> 	sub	[ncount], ax
  4328                              <1> 	;
  4329 0000D9BE 8B02                <1> 	mov	eax, [edx]
  4330 0000D9C0 C3                  <1> 	retn
  4331                              <1> get_argp_err:
  4332 0000D9C1 A3[645D0100]        <1> 	mov	[u.error], eax
  4333 0000D9C6 E924EAFFFF          <1> 	jmp	error
  4334                              <1> get_argp3:
  4335 0000D9CB B103                <1> 	mov	cl, 3
  4336                              <1> get_argp4:
  4337 0000D9CD C1E008              <1> 	shl	eax, 8
  4338 0000D9D0 665A                <1> 	pop	dx
  4339 0000D9D2 88D0                <1> 	mov 	al, dl
  4340 0000D9D4 E2F7                <1>         loop    get_argp4
  4341                              <1> 	;pop	esi
  4342 0000D9D6 C3                  <1> 	retn	
  4343                              <1> 
  4344                              <1> sysstat: 
  4345                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4346                              <1> 	; temporary !
  4347 0000D9D7 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4348 0000D9DC A3[645D0100]        <1>         mov     [u.error], eax
  4349 0000D9E1 A3[005D0100]        <1>         mov     [u.r0], eax 
  4350 0000D9E6 E904EAFFFF          <1> 	jmp	error
  4351                              <1> 
  4352                              <1> sysfstat: 
  4353                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4354                              <1> 	; temporary !
  4355 0000D9EB B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4356 0000D9F0 A3[645D0100]        <1>         mov     [u.error], eax
  4357 0000D9F5 A3[005D0100]        <1>         mov     [u.r0], eax 
  4358 0000D9FA E9F0E9FFFF          <1> 	jmp	error
  4359                              <1> 
  4360                              <1> fclose:
  4361                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  4362                              <1> 	;
  4363                              <1> 	; 18/06/2015 (Retro UNIX 386 v1 - Beginning)
  4364                              <1> 	;            (32 bit offset pointer modification)
  4365                              <1> 	; 19/04/2013 - 12/01/2014 (Retro UNIX 8086 v1)
  4366                              <1> 	;
  4367                              <1> 	; Given the file descriptor (index to the u.fp list)
  4368                              <1> 	; 'fclose' first gets the i-number of the file via 'getf'.
  4369                              <1> 	; If i-node is active (i-number > 0) the entry in 
  4370                              <1> 	; u.fp list is cleared. If all the processes that opened
  4371                              <1> 	; that file close it, then fsp etry is freed and the file
  4372                              <1> 	; is closed. If not a return is taken. 
  4373                              <1> 	; If the file has been deleted while open, 'anyi' is called
  4374                              <1> 	; to see anyone else has it open, i.e., see if it is appears
  4375                              <1> 	; in another entry in the fsp table. Upon return from 'anyi'
  4376                              <1> 	; a check is made to see if the file is special.	
  4377                              <1> 	;
  4378                              <1> 	; INPUTS ->
  4379                              <1> 	;    r1 - contains the file descriptor (value=0,1,2...)
  4380                              <1> 	;    u.fp - list of entries in the fsp table
  4381                              <1> 	;    fsp - table of entries (4 words/entry) of open files.	 
  4382                              <1> 	; OUTPUTS ->
  4383                              <1> 	;    r1 - contains the same file descriptor
  4384                              <1> 	;    r2 - contains i-number
  4385                              <1> 	;
  4386                              <1> 	; ((AX = R1))
  4387                              <1> 	; ((Modified registers: eDX, eBX, eCX, eSI, eDI, eBP))
  4388                              <1> 	;
  4389                              <1> 	; Retro UNIX 8086 v1 modification : CF = 1
  4390                              <1> 	;              if i-number of the file is 0. (error)  	
  4391                              <1> 	;
  4392                              <1> 	; TRDOS 386 (06/10/2016)
  4393                              <1> 	; 
  4394                              <1> 	; INPUT:
  4395                              <1> 	;	EAX = File Handle (File Descriptor, File Index)
  4396                              <1> 	;
  4397                              <1> 	; OUTPUT:
  4398                              <1> 	;	CF = 1 -> File not open !
  4399                              <1> 	;	CF = 0 -> OK!
  4400                              <1> 	;	     EBX = File Number (System)
  4401                              <1> 	;	     [cdev] = Logical DOS Drive Number
  4402                              <1> 	;	     EAX = File Handle/Number (user) 	
  4403                              <1> 	;
  4404                              <1> 	; Modified Registers: EBX
  4405                              <1> 
  4406 0000D9FF 50                  <1> 	push	eax ; File handle
  4407                              <1> 	
  4408 0000DA00 E846000000          <1> 	call	getf
  4409 0000DA05 0F82931F0000        <1> 	jc	device_close ; eax = device number
  4410                              <1> 
  4411 0000DA0B 80BB[0A530100]01    <1> 	cmp	byte [ebx+OF_MODE], 1 ; open mode ; 0 = empty entry
  4412 0000DA12 722E                <1> 	jb	short fclose_1	      ; 1 = read, 2 = write
  4413                              <1> 	
  4414 0000DA14 83F801              <1> 	cmp	eax, 1 ; is the first cluster number > 0
  4415 0000DA17 7229                <1> 	jb	short fclose_1 ; no, this is empty entry
  4416                              <1> 
  4417                              <1> fclose_0:
  4418 0000DA19 FE8B[1E530100]      <1> 	dec	byte [ebx+OF_OPENCOUNT] ; decrement the number of processes 
  4419                              <1> 			                ; that have opened the file
  4420 0000DA1F 7921                <1> 	jns	short fclose_1 ; jump if not negative (jump if bit 7 is 0)	 
  4421                              <1> 			; if all processes haven't closed the file, return
  4422                              <1> 	;
  4423                              <1> 	; eax ; First cluster
  4424 0000DA21 31C0                <1> 	xor	eax, eax ; 0
  4425 0000DA23 8883[0A530100]      <1> 	mov	[ebx+OF_MODE], al ; 0 = empty entry
  4426                              <1> 	;mov	[ebx+OF_STATUS], al ; 0 = empty entry
  4427 0000DA29 66C1E302            <1> 	shl	bx, 2 
  4428 0000DA2D 8983[D8520100]      <1> 	mov	[ebx+OF_FCLUSTER], eax ; 0
  4429 0000DA33 8983[F0530100]      <1> 	mov	[ebx+OF_CCLUSTER], eax ; 0
  4430                              <1> 	;mov	[ebx+OF_CCINDEX], eax ; 0
  4431 0000DA39 A3[105D0100]        <1> 	mov	[u.fofp], eax ; 0
  4432 0000DA3E 66C1EB02            <1> 	shr	bx, 2
  4433                              <1> fclose_1: ; 1:
  4434 0000DA42 58                  <1> 	pop	eax ; File handle (File Descriptor, File Index)
  4435 0000DA43 C680[065D0100]00    <1> 	mov	byte [eax+u.fp], 0 ; clear that entry in the u.fp list
  4436 0000DA4A C3                  <1> 	retn
  4437                              <1> 
  4438                              <1> getf:
  4439                              <1> 	; 12/10/2016
  4440                              <1> 	; 11/10/2016
  4441                              <1> 	; 08/10/2016
  4442                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  4443                              <1> 	; / get the device number and the i-number of an open file
  4444                              <1> 	; 13/05/2015
  4445                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  4446                              <1> 	; 19/04/2013 - 18/11/2013 (Retro UNIX 8086 v1)
  4447                              <1> 	;
  4448 0000DA4B 89C3                <1> 	mov	ebx, eax
  4449                              <1> getf1: 
  4450 0000DA4D 83FB0A              <1> 	cmp	ebx, 10
  4451 0000DA50 730A                <1>         jnb	short getf2
  4452 0000DA52 8A9B[065D0100]      <1> 	mov	bl, [ebx+u.fp]
  4453 0000DA58 08DB                <1> 	or	bl, bl
  4454 0000DA5A 7503                <1> 	jnz	short getf3
  4455                              <1> getf2:
  4456                              <1> 	; 'File not open !' error (ax=0)
  4457 0000DA5C 29C0                <1> 	sub	eax, eax
  4458 0000DA5E C3                  <1> 	retn
  4459                              <1> getf3:	
  4460 0000DA5F F6C380              <1> 	test	bl, 80h
  4461 0000DA62 7530                <1> 	jnz	short getf5 ; device
  4462 0000DA64 FECB                <1> 	dec	bl ; 0 based
  4463 0000DA66 8A83[00530100]      <1> 	mov	al, [ebx+OF_DRIVE]
  4464 0000DA6C A2[E25C0100]        <1> 	mov	[cdev], al
  4465 0000DA71 C0E302              <1> 	shl	bl, 2 ; *4 (dword offset)
  4466 0000DA74 8B83[50530100]      <1> 	mov	eax, [ebx+OF_SIZE]
  4467 0000DA7A A3[F15D0100]        <1> 	mov	[i.size], eax ; file size
  4468 0000DA7F 8D83[28530100]      <1> 	lea	eax, [ebx+OF_POINTER] ;12/10/2016
  4469 0000DA85 A3[105D0100]        <1> 	mov	[u.fofp], eax
  4470 0000DA8A 8B83[D8520100]      <1> 	mov	eax, [ebx+OF_FCLUSTER]
  4471 0000DA90 C0EB02              <1> 	shr	bl, 2 ; /4 (byte offset) 
  4472                              <1> getf4:
  4473 0000DA93 C3                  <1> 	retn
  4474                              <1> getf5: 
  4475                              <1> 	; get device number
  4476 0000DA94 80E37F              <1> 	and	bl, 7Fh ; 1 to 7Fh
  4477 0000DA97 FECB                <1> 	dec	bl ; 0 based (0 to 7Eh)
  4478 0000DA99 8A83[32510100]      <1> 	mov	al, [ebx+DEV_DRIVER]
  4479 0000DA9F 8AAB[9C500100]      <1> 	mov	ch, [ebx+DEV_ACCESS]
  4480 0000DAA5 8A8B[50510100]      <1> 	mov	cl, [ebx+DEV_OPENMODE]
  4481 0000DAAB 80E5FE              <1> 	and	ch, 0FEh ; reset bit 0 ; dev_close
  4482 0000DAAE F9                  <1> 	stc ; cf = 1 
  4483 0000DAAF C3                  <1> 	retn	
  4484                              <1> 
  4485                              <1> namei:
  4486                              <1> 	; 04/12/2015 (14 byte file names)
  4487                              <1> 	; 18/10/2015 (nbase, ncount)
  4488                              <1> 	; 12/10/2015
  4489                              <1> 	; 21/08/2015
  4490                              <1> 	; 18/07/2015
  4491                              <1> 	; 02/07/2015
  4492                              <1> 	; 17/06/2015
  4493                              <1> 	; 16/06/2015 (Retro UNIX 386 v1 - Beginning)
  4494                              <1> 	; 24/04/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  4495                              <1> 	;
  4496                              <1> 	; 'namei' takes a file path name and returns i-number of
  4497                              <1> 	; the file in the current directory or the root directory
  4498                              <1> 	; (if the first character of the pathname is '/').	
  4499                              <1> 	;
  4500                              <1> 	; INPUTS ->
  4501                              <1> 	;    u.namep - points to a file path name
  4502                              <1> 	;    u.cdir - i-number of users directory
  4503                              <1> 	;    u.cdev - device number on which user directory resides	
  4504                              <1> 	; OUTPUTS ->
  4505                              <1> 	;    r1 - i-number of file
  4506                              <1> 	;    cdev
  4507                              <1> 	;    u.dirbuf - points to directory entry where a match 
  4508                              <1> 	;               occurs in the search for file path name.
  4509                              <1> 	;	        If no match u.dirb points to the end of 
  4510                              <1> 	;               the directory and r1 = i-number of the current
  4511                              <1> 	;	        directory.	
  4512                              <1> 	; ((AX = R1))
  4513                              <1> 	;
  4514                              <1> 	; (Retro UNIX Prototype : 07/10/2012 - 05/01/2013, UNIXCOPY.ASM)
  4515                              <1>         ; ((Modified registers: eDX, eBX, eCX, eSI, eDI, eBP))  
  4516                              <1> 	;
  4517                              <1> 
  4518 0000DAB0 66A1[045D0100]      <1> 	mov	ax, [u.cdir]
  4519                              <1> 		; mov u.cdir,r1 / put the i-number of current directory
  4520                              <1> 			      ; / in r1
  4521 0000DAB6 668B15[4A5D0100]    <1> 	mov	dx, [u.cdrv]
  4522 0000DABD 668915[E25C0100]    <1> 	mov	[cdev], dx 	    ; NOTE: Retro UNIX 8086 v1 
  4523                              <1> 				    ; device/drive number is in 1 byte, 
  4524                              <1> 				    ; not in 1 word!
  4525                              <1> 		; mov u.cdev,cdev / device number for users directory 
  4526                              <1> 				; / into cdev
  4527                              <1> 	; 12/10/2015
  4528                              <1> 	; 16/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
  4529                              <1>       	 ; convert virtual (pathname) addr to physical address
  4530 0000DAC4 E82C010000          <1> 	call    trans_addr_nmbp ; 12/10/2015
  4531                              <1> 		; esi = physical address of [u.namep]
  4532                              <1> 		; ecx = byte count in the page
  4533 0000DAC9 803E2F              <1> 	cmp	byte [esi], '/'
  4534                              <1> 		; cmpb *u.namep,$'/ / is first char in file name a /
  4535 0000DACC 751E                <1> 	jne	short namei_1
  4536                              <1> 		; bne 1f
  4537 0000DACE FF05[185D0100]      <1> 	inc	dword [u.namep]
  4538                              <1> 		; inc u.namep / go to next char
  4539 0000DAD4 6649                <1> 	dec	cx ; remain byte count in the page
  4540 0000DAD6 7506                <1> 	jnz	short namei_0
  4541                              <1> 	; 12/10/2015
  4542 0000DAD8 E818010000          <1> 	call	trans_addr_nmbp ; convert virtual address to physical
  4543                              <1> 		; esi = physical address (page start + offset)
  4544                              <1> 		; ecx = byte count in the page
  4545 0000DADD 4E                  <1> 	dec	esi
  4546                              <1> namei_0:
  4547 0000DADE 46                  <1> 	inc 	esi  ; go to next char
  4548 0000DADF 66A1[EC5C0100]      <1> 	mov	ax, [rootdir] ; 09/07/2013
  4549                              <1> 		; mov rootdir,r1 / put i-number of rootdirectory in r1
  4550 0000DAE5 C605[E25C0100]00    <1> 	mov	byte [cdev], 0
  4551                              <1> 		; clr cdev / clear device number
  4552                              <1> namei_1: ; 1:
  4553 0000DAEC F606FF              <1> 	test	byte [esi], 0FFh
  4554 0000DAEF 74A2                <1> 	jz	short getf4
  4555                              <1> 	;jz      nig
  4556                              <1> 		; tstb *u.namep / is the character in file name a nul
  4557                              <1> 		; beq nig / yes, end of file name reached; 
  4558                              <1> 			; / branch to "nig"
  4559                              <1> namei_2: ; 1:
  4560                              <1> 	; 18/10/2015
  4561 0000DAF1 8935[E05D0100]      <1> 	mov 	[nbase], esi
  4562 0000DAF7 66890D[E45D0100]    <1> 	mov 	[ncount], cx
  4563                              <1> 	;
  4564                              <1> 	;mov	dx, 2
  4565 0000DAFE B202                <1> 	mov	dl, 2 ; user flag (read, non-owner)
  4566 0000DB00 E8D1150000          <1> 	call	access
  4567                              <1> 		; jsr r0,access; 2 / get i-node with i-number r1
  4568                              <1> 	; 'access' will not return here if user has not "r" permission !
  4569 0000DB05 66F705[9C590100]00- <1> 	test 	word [i.flgs], 4000h
  4569 0000DB0D 40                  <1>
  4570                              <1> 		; bit $40000,i.flgs / directory i-node?
  4571 0000DB0E 746A                <1>         jz      short namei_err
  4572                              <1> 		; beq error3 / no, got an error
  4573                              <1> 	; 16/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
  4574 0000DB10 31C0                <1> 	xor	eax, eax
  4575 0000DB12 A3[1C5D0100]        <1> 	mov	[u.off], eax ; 0
  4576 0000DB17 66A1[F15D0100]      <1> 	mov	ax, [i.size]
  4577 0000DB1D A3[145D0100]        <1> 	mov	[u.dirp], eax
  4578                              <1> 		; mov i.size,u.dirp / put size of directory in u.dirp
  4579                              <1> 		; clr u.off / u.off is file offset used by user
  4580 0000DB22 C705[105D0100]-     <1> 	mov	dword [u.fofp], u.off
  4580 0000DB28 [1C5D0100]          <1>
  4581                              <1> 		; mov $u.off,u.fofp / u.fofp is a pointer to 
  4582                              <1> 				  ; / the offset portion of fsp entry
  4583                              <1> namei_3: ; 2:
  4584 0000DB2C C705[205D0100]-     <1> 	mov	dword [u.base], u.dirbuf
  4584 0000DB32 [345D0100]          <1>
  4585                              <1> 		; mov $u.dirbuf,u.base / u.dirbuf holds a file name 
  4586                              <1> 				    ; / copied from a directory
  4587 0000DB36 C705[245D0100]1000- <1> 	mov 	dword [u.count], 16 ; 04/12/2015 (10 -> 16) 	
  4587 0000DB3E 0000                <1>
  4588                              <1>  		; mov $10.,u.count / u.count is byte count 
  4589                              <1> 				 ; / for reads and writes
  4590 0000DB40 66A1[ED5D0100]      <1> 	mov 	ax, [ii]
  4591                              <1> 	; 31/07/2013 ('namei_r') - 16/06/2015 ('u.kcall')
  4592 0000DB46 FE05[625D0100]      <1>  	inc     byte [u.kcall] ; the caller is 'namei' sign	
  4593 0000DB4C E8A2070000          <1>     	call	readi
  4594                              <1> 		; jsr r0,readi / read 10. bytes of file 
  4595                              <1> 		      ; with i-number (r1); i.e. read a directory entry
  4596 0000DB51 8B0D[285D0100]      <1> 	mov 	ecx, [u.nread]
  4597 0000DB57 09C9                <1> 	or 	ecx, ecx
  4598                              <1> 		; tst u.nread
  4599 0000DB59 741B                <1> 	jz	short nib
  4600                              <1> 		; ble nib / gives error return
  4601                              <1> 	;
  4602 0000DB5B 668B1D[345D0100]    <1> 	mov 	bx, [u.dirbuf]
  4603 0000DB62 6621DB              <1> 	and 	bx, bx       
  4604                              <1> 		; tst u.dirbuf /
  4605 0000DB65 7522                <1> 	jnz	short namei_4
  4606                              <1> 		; bne 3f / branch when active directory entry 
  4607                              <1> 		       ; / (i-node word in entry non zero)
  4608 0000DB67 A1[1C5D0100]        <1> 	mov	eax, [u.off]
  4609 0000DB6C 83E810              <1> 	sub	eax, 16 ; 04/12/2015 (10 -> 16) 
  4610 0000DB6F A3[145D0100]        <1> 	mov	[u.dirp], eax
  4611                              <1> 		; mov u.off,u.dirp
  4612                              <1> 		; sub $10.,u.dirp
  4613 0000DB74 EBB6                <1> 	jmp	short namei_3
  4614                              <1> 		; br 2b
  4615                              <1> 
  4616                              <1> 	; 18/07/2013
  4617                              <1> nib: 
  4618 0000DB76 31C0                <1> 	xor	eax, eax  ; xor ax, ax ; ax = 0 -> file not found 
  4619 0000DB78 F9                  <1> 	stc
  4620                              <1> nig:
  4621 0000DB79 C3                  <1> 	retn
  4622                              <1> 
  4623                              <1> namei_err:
  4624                              <1> 	; 16/06/2015
  4625 0000DB7A C705[645D0100]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a directory !' error
  4625 0000DB82 0000                <1>
  4626 0000DB84 E966E8FFFF          <1> 	jmp	error
  4627                              <1> 
  4628                              <1> namei_4: ; 3:
  4629                              <1> 	; 18/10/2015
  4630                              <1> 	; 12/10/2015
  4631                              <1> 	; 21/08/2015
  4632                              <1> 	; 18/07/2015
  4633 0000DB89 8B2D[185D0100]      <1> 	mov	ebp, [u.namep]
  4634                              <1> 		; mov u.namep,r2 / u.namep points into a file name string
  4635 0000DB8F BF[365D0100]        <1> 	mov 	edi, u.dirbuf + 2
  4636                              <1> 		; mov $u.dirbuf+2,r3 / points to file name of directory entry
  4637                              <1> 	; 18/10/2015
  4638 0000DB94 8B35[E05D0100]      <1> 	mov	esi, [nbase]	
  4639 0000DB9A 668B0D[E45D0100]    <1> 	mov	cx, [ncount]
  4640                              <1> 	;
  4641 0000DBA1 6621C9              <1> 	and	cx, cx
  4642 0000DBA4 7505                <1> 	jnz	short namei_5	
  4643                              <1> 	;
  4644 0000DBA6 E850000000          <1> 	call	trans_addr_nm ; convert virtual address to physical
  4645                              <1> 		; esi = physical address (page start + offset)
  4646                              <1> 		; ecx = byte count in the page
  4647                              <1> namei_5: ; 3:
  4648 0000DBAB 45                  <1> 	inc	ebp ; 18/07/2015
  4649 0000DBAC AC                  <1> 	lodsb   ; mov al, [esi] ; inc esi (al = r4)
  4650                              <1> 		; movb (r2)+,r4 / move a character from u.namep string into r4
  4651 0000DBAD 08C0                <1> 	or 	al, al
  4652 0000DBAF 741D                <1> 	jz 	short namei_7
  4653                              <1> 		; beq 3f / if char is nul, then the last char in string
  4654                              <1> 			; / has been moved
  4655 0000DBB1 3C2F                <1> 	cmp	al, '/'
  4656                              <1> 		; cmp r4,$'/ / is char a </>
  4657 0000DBB3 7419                <1> 	je 	short namei_7
  4658                              <1> 		; beq 3f	
  4659                              <1> 	; 12/10/2015
  4660 0000DBB5 6649                <1> 	dec	cx ; remain byte count in the page
  4661 0000DBB7 7505                <1> 	jnz	short namei_6
  4662 0000DBB9 E83D000000          <1> 	call	trans_addr_nm ; convert virtual address to physical
  4663                              <1> 		; esi = physical address (page start + offset)
  4664                              <1> 		; ecx = byte count in the page
  4665                              <1> namei_6:
  4666 0000DBBE 81FF[445D0100]      <1>         cmp     edi, u.dirbuf + 16 ; 04/12/2015 (10 -> 16) 
  4667                              <1> 		; cmp r3,$u.dirbuf+10. / have I checked
  4668                              <1> 				     ; / all 8 bytes of file name
  4669 0000DBC4 74E5                <1> 	je	short namei_5
  4670                              <1> 		; beq 3b
  4671 0000DBC6 AE                  <1> 	scasb	
  4672                              <1> 		; cmpb (r3)+,r4 / compare char in u.namep string to file name 
  4673                              <1> 			      ; / char read from directory
  4674 0000DBC7 74E2                <1> 	je 	short namei_5
  4675                              <1> 		; beq 3b / branch if chars match
  4676                              <1> 
  4677 0000DBC9 E95EFFFFFF          <1>         jmp    namei_3 ; 2b
  4678                              <1> 		; br 2b / file names do not match go to next directory entry
  4679                              <1> namei_7: ; 3:
  4680 0000DBCE 81FF[445D0100]      <1> 	cmp	edi, u.dirbuf + 16 ; 04/12/2015 (10 -> 16) 
  4681                              <1> 		; cmp r3,$u.dirbuf+10. / if equal all 8 bytes were matched
  4682 0000DBD4 740A                <1> 	je	short namei_8
  4683                              <1> 		; beq 3f
  4684 0000DBD6 8A27                <1> 	mov 	ah, [edi]
  4685                              <1> 	;inc 	edi 
  4686 0000DBD8 20E4                <1> 	and 	ah, ah
  4687                              <1> 		; tstb (r3)+ /
  4688 0000DBDA 0F854CFFFFFF        <1>         jnz     namei_3
  4689                              <1> 		; bne 2b
  4690                              <1> namei_8: ; 3
  4691 0000DBE0 892D[185D0100]      <1> 	mov	[u.namep], ebp ; 18/07/2015
  4692                              <1> 		; mov r2,u.namep / u.namep points to char 
  4693                              <1> 			       ; / following a / or nul
  4694                              <1> 	;mov	bx, [u.dirbuf]
  4695                              <1> 		; mov u.dirbuf,r1 / move i-node number in directory 
  4696                              <1> 				; / entry to r1
  4697 0000DBE6 20C0                <1> 	and 	al, al
  4698                              <1> 		; tst r4 / if r4 = 0 the end of file name reached,
  4699                              <1> 		      ;  / if r4 = </> then go to next directory
  4700                              <1> 	; mov	ax, bx
  4701 0000DBE8 66A1[345D0100]      <1> 	mov 	ax, [u.dirbuf] ; 17/06/2015
  4702 0000DBEE 0F85FDFEFFFF        <1>         jnz     namei_2 
  4703                              <1> 		; bne 1b
  4704                              <1> 	; AX = i-number of the file
  4705                              <1> ;;nig:
  4706 0000DBF4 C3                  <1> 	retn
  4707                              <1> 		; tst (r0)+ / gives non-error return
  4708                              <1> ;;nib:
  4709                              <1> ;;	xor	ax, ax ; Retro UNIX 8086 v1 modification !
  4710                              <1> 		       ; ax = 0 -> file not found 
  4711                              <1> ;;	stc	; 27/05/2013
  4712                              <1> ;;	retn
  4713                              <1> 		; rts r0
  4714                              <1> 
  4715                              <1> trans_addr_nmbp:
  4716                              <1> 	; 18/10/2015
  4717                              <1> 	; 12/10/2015
  4718 0000DBF5 8B2D[185D0100]      <1> 	mov 	ebp, [u.namep]
  4719                              <1> trans_addr_nm: 
  4720                              <1> 	; Convert virtual (pathname) address to physical address
  4721                              <1> 	; (Retro UNIX 386 v1 feature only !)
  4722                              <1> 	; 18/10/2015
  4723                              <1> 	; 12/10/2015 (u.pnbase & u.pncount has been removed from code)
  4724                              <1> 	; 02/07/2015
  4725                              <1> 	; 17/06/2015
  4726                              <1> 	; 16/06/2015
  4727                              <1> 	;
  4728                              <1> 	; INPUTS: 
  4729                              <1> 	;	ebp = pathname address (virtual) ; [u.namep]
  4730                              <1> 	;	[u.pgdir] = user's page directory
  4731                              <1> 	; OUTPUT:
  4732                              <1> 	;       esi = physical address of the pathname
  4733                              <1> 	;	ecx = remain byte count in the page
  4734                              <1> 	;
  4735                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI)
  4736                              <1> 	;
  4737 0000DBFB 833D[585D0100]00    <1>         cmp     dword [u.ppgdir], 0  ; /etc/init ? (sysexec)
  4738 0000DC02 7618                <1> 	jna	short trans_addr_nmk ; the caller is os kernel;
  4739                              <1> 				     ; it is already physical address
  4740 0000DC04 50                  <1>    	push	eax	
  4741 0000DC05 89EB                <1> 	mov	ebx, ebp ; [u.namep] ; pathname address (virtual)
  4742 0000DC07 E88276FFFF          <1>        	call	get_physical_addr ; get physical address
  4743 0000DC0C 7204                <1> 	jc	short tr_addr_nm_err
  4744                              <1> 	; 18/10/2015
  4745                              <1> 	; eax = physical address 
  4746                              <1> 	; cx = remain byte count in page (1-4096) 
  4747                              <1> 		; 12/10/2015 (cx = [u.pncount])
  4748 0000DC0E 89C6                <1> 	mov	esi, eax ; 12/10/2015 (esi=[u.pnbase])
  4749 0000DC10 58                  <1> 	pop	eax 
  4750 0000DC11 C3                  <1> 	retn
  4751                              <1> 
  4752                              <1> tr_addr_nm_err:
  4753 0000DC12 A3[645D0100]        <1> 	mov	[u.error], eax
  4754                              <1> 	;pop 	eax
  4755 0000DC17 E9D3E7FFFF          <1> 	jmp	error
  4756                              <1> 
  4757                              <1> trans_addr_nmk:
  4758                              <1> 	; 12/10/2015
  4759                              <1> 	; 02/07/2015
  4760 0000DC1C 8B35[185D0100]      <1> 	mov	esi, [u.namep]  ; [u.pnbase]
  4761 0000DC22 66B90010            <1> 	mov	cx, PAGE_SIZE ; 4096 ; [u.pncount]
  4762 0000DC26 C3                  <1> 	retn
  4763                              <1> 
  4764                              <1> syschdir:
  4765                              <1> 	; / makes the directory specified in the argument
  4766                              <1> 	; / the current directory
  4767                              <1> 	;
  4768                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  4769                              <1> 	; 19/06/2013 (Retro UNIX 8086 v1)
  4770                              <1> 	;
  4771                              <1> 	; 'syschdir' makes the directory specified in its argument
  4772                              <1> 	; the current working directory.
  4773                              <1> 	;
  4774                              <1> 	; Calling sequence:
  4775                              <1> 	;	syschdir; name
  4776                              <1> 	; Arguments:
  4777                              <1> 	;	name - address of the path name of a directory
  4778                              <1> 	;	       terminated by nul byte.	
  4779                              <1> 	; Inputs: -
  4780                              <1> 	; Outputs: -
  4781                              <1> 	; ...............................................................
  4782                              <1> 	;				
  4783                              <1> 	; Retro UNIX 8086 v1 modification:
  4784                              <1> 	;	 The user/application program puts address of 
  4785                              <1> 	;	 the path name in BX register as 'syschdir' 
  4786                              <1> 	; 	 system call argument.
  4787                              <1> 
  4788 0000DC27 891D[185D0100]      <1> 	mov	[u.namep], ebx
  4789                              <1> 		;jsr r0,arg; u.namep / u.namep points to path name
  4790 0000DC2D E87EFEFFFF          <1> 	call	namei
  4791                              <1> 		; jsr r0,namei / find its i-number
  4792                              <1> 	;jc	error
  4793                              <1> 		; br error3
  4794 0000DC32 730F                <1> 	jnc	short syschdir0
  4795                              <1> 	; 'directory not found !' error
  4796 0000DC34 C705[645D0100]0C00- <1> 	mov	dword [u.error], ERR_DIR_NOT_FOUND ; 12
  4796 0000DC3C 0000                <1>
  4797 0000DC3E E9ACE7FFFF          <1> 	jmp	error
  4798                              <1> syschdir0:
  4799 0000DC43 E88E140000          <1> 	call	access
  4800                              <1> 		; jsr r0,access; 2 / get i-node into core
  4801 0000DC48 66F705[9C590100]00- <1> 	test	word [i.flgs], 4000h
  4801 0000DC50 40                  <1>
  4802                              <1> 		; bit $40000,i.flgs / is it a directory?
  4803                              <1> 	;jz	error 
  4804                              <1> 		; beq error3 / no error
  4805 0000DC51 750F                <1> 	jnz	short syschdir1
  4806 0000DC53 C705[645D0100]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a valid directory !'
  4806 0000DC5B 0000                <1>
  4807 0000DC5D E98DE7FFFF          <1> 	jmp	error
  4808                              <1> syschdir1:
  4809 0000DC62 66A3[045D0100]      <1> 	mov	[u.cdir], ax
  4810                              <1> 		; mov r1,u.cdir / move i-number to users 
  4811                              <1> 			      ; / current directory
  4812 0000DC68 66A1[E25C0100]      <1> 	mov	ax, [cdev]
  4813 0000DC6E 66A3[4A5D0100]      <1> 	mov	[u.cdrv], ax
  4814                              <1> 		; mov cdev,u.cdev / move its device to users 
  4815                              <1> 			        ; / current device
  4816 0000DC74 E996E7FFFF          <1> 	jmp	sysret
  4817                              <1> 		; br sysret3
  4818                              <1> 	
  4819                              <1> syschmod: ; < change mode of file >
  4820                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4821                              <1> 	; temporary !
  4822 0000DC79 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4823 0000DC7E A3[645D0100]        <1>         mov     [u.error], eax
  4824 0000DC83 A3[005D0100]        <1>         mov     [u.r0], eax 
  4825 0000DC88 E962E7FFFF          <1> 	jmp	error
  4826                              <1> 
  4827                              <1> isown:
  4828                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4829                              <1> 	; 04/05/2013 - 07/07/2013 (Retro UNIX 8086 v1)
  4830                              <1> 	;
  4831                              <1> 	; 'isown' is given a file name (the 1st argument).
  4832                              <1> 	;  It find the i-number of that file via 'namei' 
  4833                              <1> 	;  then gets the i-node into core via 'iget'.
  4834                              <1> 	;  It then tests to see if the user is super user. 
  4835                              <1> 	;  If not, it cheks to see if the user is owner of 
  4836                              <1> 	;  the file. If he is not an error occurs.
  4837                              <1> 	;  If user is the owner 'setimod' is called to indicate
  4838                              <1> 	;  the inode has been modificed and the 2nd argument of
  4839                              <1> 	;  the call is put in r2.
  4840                              <1> 	;
  4841                              <1> 	; INPUTS ->
  4842                              <1> 	;    arguments of syschmod and syschown calls
  4843                              <1> 	; OUTPUTS ->
  4844                              <1> 	;    u.uid - id of user
  4845                              <1> 	;    imod - set to a 1
  4846                              <1> 	;    r2 - contains second argument of the system call				 	
  4847                              <1> 	;
  4848                              <1> 	;   ((AX=R2) output as 2nd argument)
  4849                              <1> 	;
  4850                              <1>         ; ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
  4851                              <1> 	;
  4852                              <1> 		; jsr r0,arg2 / u.namep points to file name
  4853                              <1> 	;; ! 2nd argument on top of stack !
  4854                              <1> 	;; 22/06/2015 - 32 bit modifications
  4855                              <1> 	;; 07/07/2013
  4856 0000DC8D 891D[185D0100]      <1> 	mov	[u.namep], ebx ;; 1st argument
  4857 0000DC93 51                  <1> 	push 	ecx ;; 2nd argument
  4858                              <1> 	;;
  4859 0000DC94 E817FEFFFF          <1> 	call	namei
  4860                              <1> 		; jsr r0,namei / get its i-number
  4861                              <1>        ; Retro UNIX 8086 v1 modification !
  4862                              <1>        ; ax = 0 -> file not found 
  4863                              <1> 	;and	ax, ax
  4864                              <1> 	;jz	error
  4865                              <1> 	;jc	error ; 27/05/2013
  4866                              <1> 		; br error3
  4867 0000DC99 730F                <1> 	jnc	short isown0
  4868                              <1> 	; 'file not found !' error
  4869 0000DC9B C705[645D0100]0C00- <1> 	mov	dword [u.error], ERR_FILE_NOT_FOUND ; 12
  4869 0000DCA3 0000                <1>
  4870 0000DCA5 E945E7FFFF          <1> 	jmp	error
  4871                              <1> isown0:
  4872 0000DCAA E821140000          <1> 	call	iget
  4873                              <1> 		; jsr r0,iget / get i-node into core
  4874 0000DCAF A0[4C5D0100]        <1> 	mov	al, [u.uid] ; 02/08/2013
  4875 0000DCB4 08C0                <1> 	or	al, al
  4876                              <1> 		; tstb u.uid / super user?
  4877 0000DCB6 7417                <1> 	jz	short isown1
  4878                              <1> 		; beq 1f / yes, branch
  4879 0000DCB8 3A05[9F590100]      <1> 	cmp	al, [i.uid]
  4880                              <1> 		; cmpb i.uid,u.uid / no, is this the owner of
  4881                              <1> 				 ; / the file
  4882                              <1> 	;jne	error
  4883                              <1> 		; beq 1f / yes
  4884                              <1> 		; jmp error3 / no, error
  4885 0000DCBE 740F                <1> 	je	short isown1
  4886                              <1> 
  4887 0000DCC0 C705[645D0100]0B00- <1> 	mov	dword [u.error], ERR_NOT_OWNER  ; 11
  4887 0000DCC8 0000                <1>
  4888                              <1> 			;  'permission denied !' error
  4889 0000DCCA E920E7FFFF          <1> 	jmp	error
  4890                              <1> isown1: ; 1:
  4891 0000DCCF E800140000          <1> 	call	setimod
  4892                              <1> 		; jsr r0,setimod / indicates 
  4893                              <1> 		;	       ; / i-node has been modified
  4894 0000DCD4 58                  <1> 	pop	eax ; 2nd argument
  4895                              <1> 		; mov (sp)+,r2 / mode is put in r2 
  4896                              <1> 		       ; / (u.off put on stack with 2nd arg)
  4897 0000DCD5 C3                  <1> 	retn
  4898                              <1> 		; rts r0
  4899                              <1> 
  4900                              <1> ;;arg:  ; < get system call arguments >
  4901                              <1> 	; 'arg' extracts an argument for a routine whose call is 
  4902                              <1> 	; of form:
  4903                              <1> 	;	sys 'routine' ; arg1
  4904                              <1> 	;		or
  4905                              <1> 	;	sys 'routine' ; arg1 ; arg2
  4906                              <1> 	;		or
  4907                              <1> 	;	sys 'routine' ; arg1;...;arg10 (sys exec) 
  4908                              <1> 	;	
  4909                              <1> 	; INPUTS ->
  4910                              <1> 	;    u.sp+18 - contains a pointer to one of arg1..argn
  4911                              <1> 	;	This pointers's value is actually the value of
  4912                              <1> 	;	update pc at the the trap to sysent (unkni) is
  4913                              <1> 	;	made to process the sys instruction
  4914                              <1> 	;    r0 - contains the return address for the routine
  4915                              <1> 	;	that called arg. The data in the word pointer 
  4916                              <1> 	;	to by the return address is used as address
  4917                              <1> 	;	in which the extracted argument is stored   		
  4918                              <1> 	;    	
  4919                              <1> 	; OUTPUTS ->
  4920                              <1> 	;    'address' - contains the extracted argument 
  4921                              <1> 	;    u.sp+18 - is incremented by 2 
  4922                              <1> 	;    r1 - contains the extracted argument
  4923                              <1> 	;    r0 - points to the next instruction to be
  4924                              <1> 	;	 executed in the calling routine.
  4925                              <1> 	;
  4926                              <1>   
  4927                              <1> 	; mov u.sp,r1
  4928                              <1> 	; mov *18.(r1),*(r0)+ / put argument of system call
  4929                              <1> 			; / into argument of arg2
  4930                              <1> 	; add $2,18.(r1) / point pc on stack 
  4931                              <1> 			      ; / to next system argument
  4932                              <1> 	; rts r0
  4933                              <1> 
  4934                              <1> ;;arg2: ; < get system calls arguments - with file name pointer>
  4935                              <1> 	; 'arg2' takes first argument in system call
  4936                              <1> 	;  (pointer to name of the file) and puts it in location
  4937                              <1> 	;  u.namep; takes second argument and puts it in u.off
  4938                              <1> 	;  and on top of the stack
  4939                              <1> 	;	
  4940                              <1> 	; INPUTS ->
  4941                              <1> 	;    u.sp, r0
  4942                              <1> 	;    	
  4943                              <1> 	; OUTPUTS ->
  4944                              <1> 	;    u.namep
  4945                              <1> 	;    u.off 
  4946                              <1> 	;    u.off pushed on stack
  4947                              <1> 	;    r1
  4948                              <1> 	;
  4949                              <1> 
  4950                              <1> 	; jsr	r0,arg; u.namep / u.namep contains value of
  4951                              <1> 				; / first arg in sys call
  4952                              <1> 	; jsr r0,arg; u.off / u.off contains value of 
  4953                              <1> 				; / second arg in sys call
  4954                              <1> 	; mov r0,r1 / r0 points to calling routine
  4955                              <1> 	; mov (sp),r0 / put operation code back in r0
  4956                              <1> 	; mov u.off,(sp) / put pointer to second argument 
  4957                              <1> 			; / on stack
  4958                              <1> 	; jmp (r1) / return to calling routine
  4959                              <1> 
  4960                              <1> syschown: ; < change owner of file >
  4961                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  4962                              <1> 	; 20/06/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  4963                              <1> 	;
  4964                              <1> 	; 'syschown' changes the owner of the file whose name is given
  4965                              <1> 	; as null terminated string pointed to by 'name' has it's owner
  4966                              <1> 	; changed to 'owner'
  4967                              <1> 	;
  4968                              <1> 	; Calling sequence:
  4969                              <1> 	;	syschown; name; owner
  4970                              <1> 	; Arguments:
  4971                              <1> 	;	name - address of the file name
  4972                              <1> 	;	       terminated by null byte.
  4973                              <1> 	;	owner - (new) owner (number/ID)
  4974                              <1> 	;	
  4975                              <1> 	; Inputs: -
  4976                              <1> 	; Outputs: -
  4977                              <1> 	; ...............................................................
  4978                              <1> 	;				
  4979                              <1> 	; Retro UNIX 8086 v1 modification: 
  4980                              <1> 	;       'syschown' system call has two arguments; so,
  4981                              <1> 	;	* 1st argument, name is pointed to by BX register
  4982                              <1> 	;	* 2nd argument, owner number is in CX register
  4983                              <1> 	;
  4984                              <1> 	; / name; owner
  4985 0000DCD6 E8B2FFFFFF          <1> 	call	isown
  4986                              <1> 		; jsr r0,isown / get the i-node and check user status
  4987 0000DCDB 803D[4C5D0100]00    <1> 	cmp 	byte [u.uid], 0 ; 02/08/2013 
  4988                              <1> 		; tstb u.uid / super user
  4989 0000DCE2 7418                <1> 	jz	short syschown1
  4990                              <1> 		; beq 2f / yes, 2f
  4991 0000DCE4 F605[9C590100]20    <1>         test    byte [i.flgs], 20h ; 32
  4992                              <1> 		; bit $40,i.flgs / no, set userid on execution?
  4993                              <1> 	;jnz	error
  4994                              <1> 		; bne 3f / yes error, could create Trojan Horses
  4995 0000DCEB 740F                <1> 	jz	short syschown1
  4996                              <1> 	; 'permission denied !'
  4997 0000DCED C705[645D0100]0B00- <1> 	mov	dword [u.error], ERR_FILE_ACCESS  ; 11
  4997 0000DCF5 0000                <1>
  4998 0000DCF7 E9F3E6FFFF          <1> 	jmp	error
  4999                              <1> syschown1: ; 2:
  5000                              <1> 	; AL = owner (number/ID)
  5001 0000DCFC A2[9F590100]        <1> 	mov	[i.uid], al ; 23/06/2015
  5002                              <1> 		;  movb	r2,i.uid / no, put the new owners id 
  5003                              <1> 			       ; / in the i-node
  5004 0000DD01 E909E7FFFF          <1> 	jmp	sysret
  5005                              <1> 	; 1: 
  5006                              <1> 		; jmp sysret4
  5007                              <1> 	; 3:
  5008                              <1> 		; jmp	error
  5009                              <1> 
  5010                              <1> systime: ; / get time of year
  5011                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  5012                              <1> 	; 20/06/2013 (Retro UNIX 8086 v1)
  5013                              <1> 	;
  5014                              <1> 	; 20/06/2013
  5015                              <1> 	; 'systime' gets the time of the year.
  5016                              <1> 	; The present time is put on the stack.
  5017                              <1> 	;
  5018                              <1> 	; Calling sequence:
  5019                              <1> 	;	systime
  5020                              <1> 	; Arguments: -
  5021                              <1> 	;	
  5022                              <1> 	; Inputs: -
  5023                              <1> 	; Outputs: sp+2, sp+4 - present time
  5024                              <1> 	; ...............................................................
  5025                              <1> 	;	
  5026                              <1> 	; Retro UNIX 8086 v1 modification: 
  5027                              <1> 	;       'systime' system call will return to the user
  5028                              <1> 	;	with unix time (epoch) in DX:AX register pair
  5029                              <1> 	;
  5030                              <1> 	; 	!! Major modification on original Unix v1 'systime' 
  5031                              <1> 	;	system call for PC compatibility !!		 	
  5032                              <1> 
  5033 0000DD06 E8CC130000          <1> 	call 	epoch
  5034 0000DD0B A3[005D0100]        <1> 	mov 	[u.r0], eax
  5035                              <1> 		; mov s.time,4(sp)
  5036                              <1> 		; mov s.time+2,2(sp) / put the present time 
  5037                              <1> 				   ; / on the stack
  5038                              <1> 		; br sysret4
  5039 0000DD10 E9FAE6FFFF          <1> 	jmp	sysret 
  5040                              <1> 
  5041                              <1> sysstime: ; / set time
  5042                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  5043                              <1> 	; 20/06/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  5044                              <1> 	;
  5045                              <1> 	; 'sysstime' sets the time. Only super user can use this call.
  5046                              <1> 	;
  5047                              <1> 	; Calling sequence:
  5048                              <1> 	;	sysstime
  5049                              <1> 	; Arguments: -
  5050                              <1> 	;	
  5051                              <1> 	; Inputs: sp+2, sp+4 - time system is to be set to.
  5052                              <1> 	; Outputs: -
  5053                              <1> 	; ...............................................................
  5054                              <1> 	;	
  5055                              <1> 	; Retro UNIX 8086 v1 modification: 
  5056                              <1> 	;	the user calls 'sysstime' with unix (epoch) time
  5057                              <1> 	;	(to be set) is in CX:BX register pair as two arguments.
  5058                              <1> 	; 
  5059                              <1> 	;	Retro UNIX 8086 v1 argument transfer method 2 is used
  5060                              <1> 	;	to get sysstime system call arguments from the user;
  5061                              <1> 	;	* 1st argument, lowword of unix time is in BX register
  5062                              <1> 	;	* 2nd argument, highword of unix time is in CX register		 	
  5063                              <1> 	;
  5064                              <1> 	; 	!! Major modification on original Unix v1 'sysstime' 
  5065                              <1> 	;	system call for PC compatibility !!	
  5066                              <1> 
  5067 0000DD15 803D[4C5D0100]00    <1> 	cmp	byte [u.uid], 0
  5068                              <1> 		; tstb u.uid / is user the super user
  5069                              <1> 	;ja	error
  5070                              <1> 		; bne error4 / no, error
  5071 0000DD1C 760F                <1> 	jna	short systime1
  5072                              <1> 	; 'permission denied !'
  5073 0000DD1E C705[645D0100]0B00- <1> 	mov	dword [u.error], ERR_NOT_SUPERUSER  ; 11 
  5073 0000DD26 0000                <1>
  5074 0000DD28 E9C2E6FFFF          <1> 	jmp	error
  5075                              <1> systime1:
  5076                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - 32 bit version)
  5077                              <1> 	; EBX = unix (epoch) time (from user)
  5078 0000DD2D 89D8                <1> 	mov	eax, ebx
  5079 0000DD2F E8A5130000          <1> 	call 	set_date_time
  5080                              <1> 		; mov 4(sp),s.time
  5081                              <1> 		; mov 2(sp),s.time+2 / set the system time
  5082 0000DD34 E9D6E6FFFF          <1> 	jmp	sysret
  5083                              <1> 		; br sysret4
  5084                              <1> 
  5085                              <1> sysbreak:
  5086                              <1> 	; 18/10/2015
  5087                              <1> 	; 07/10/2015
  5088                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  5089                              <1> 	; 20/06/2013 - 24/03/2014 (Retro UNIX 8086 v1)
  5090                              <1> 	;
  5091                              <1> 	; 'sysbreak' sets the programs break points. 
  5092                              <1> 	; It checks the current break point (u.break) to see if it is
  5093                              <1> 	; between "core" and the stack (sp). If it is, it is made an
  5094                              <1> 	; even address (if it was odd) and the area between u.break
  5095                              <1> 	; and the stack is cleared. The new breakpoint is then put
  5096                              <1> 	; in u.break and control is passed to 'sysret'.
  5097                              <1> 	;
  5098                              <1> 	; Calling sequence:
  5099                              <1> 	;	sysbreak; addr
  5100                              <1> 	; Arguments: -
  5101                              <1> 	;	
  5102                              <1> 	; Inputs: u.break - current breakpoint
  5103                              <1> 	; Outputs: u.break - new breakpoint 
  5104                              <1> 	;	area between old u.break and the stack (sp) is cleared.
  5105                              <1> 	; ...............................................................
  5106                              <1> 	;	
  5107                              <1> 	; Retro UNIX 8086 v1 modification:
  5108                              <1> 	;	The user/application program puts breakpoint address
  5109                              <1> 	;       in BX register as 'sysbreak' system call argument.
  5110                              <1> 	; 	(argument transfer method 1)
  5111                              <1> 	;
  5112                              <1> 	;  NOTE: Beginning of core is 0 in Retro UNIX 8086 v1 !
  5113                              <1> 	; 	((!'sysbreak' is not needed in Retro UNIX 8086 v1!))
  5114                              <1> 	;  NOTE:
  5115                              <1> 	; 	'sysbreak' clears extended part (beyond of previous
  5116                              <1> 	;	'u.break' address) of user's memory for original unix's
  5117                              <1> 	;	'bss' compatibility with Retro UNIX 8086 v1 (19/11/2013)
  5118                              <1> 
  5119                              <1> 		; mov u.break,r1 / move users break point to r1
  5120                              <1> 		; cmp r1,$core / is it the same or lower than core?
  5121                              <1> 		; blos 1f / yes, 1f
  5122                              <1> 	; 23/06/2015
  5123 0000DD39 8B2D[2C5D0100]      <1> 	mov	ebp, [u.break] ; virtual address (offset)
  5124                              <1> 	;and	ebp, ebp
  5125                              <1> 	;jz	short sysbreak_3 
  5126                              <1> 	; Retro UNIX 386 v1 NOTE: u.break points to virtual address !!!
  5127                              <1> 	; (Even break point address is not needed for Retro UNIX 386 v1)
  5128 0000DD3F 8B15[F85C0100]      <1> 	mov	edx, [u.sp] ; kernel stack at the beginning of sys call
  5129 0000DD45 83C20C              <1> 	add	edx, 12 ; EIP -4-> CS -4-> EFLAGS -4-> ESP (user) 
  5130                              <1> 	; 07/10/2015
  5131 0000DD48 891D[2C5D0100]      <1> 	mov	[u.break], ebx ; virtual address !!!
  5132                              <1> 	;
  5133 0000DD4E 3B1A                <1> 	cmp	ebx, [edx] ; compare new break point with 
  5134                              <1> 			   ; with top of user's stack (virtual!)
  5135 0000DD50 7327                <1> 	jnb	short sysbreak_3
  5136                              <1> 		; cmp r1,sp / is it the same or higher 
  5137                              <1> 			  ; / than the stack?
  5138                              <1> 		; bhis 1f / yes, 1f
  5139 0000DD52 89DE                <1> 	mov	esi, ebx
  5140 0000DD54 29EE                <1> 	sub	esi, ebp ; new break point - old break point
  5141 0000DD56 7621                <1> 	jna	short sysbreak_3 
  5142                              <1> 	;push	ebx
  5143                              <1> sysbreak_1:
  5144 0000DD58 89EB                <1> 	mov	ebx, ebp  
  5145 0000DD5A E82F75FFFF          <1> 	call	get_physical_addr ; get physical address
  5146 0000DD5F 0F82ADFEFFFF        <1> 	jc	tr_addr_nm_err
  5147                              <1> 	; 18/10/2015
  5148 0000DD65 89C7                <1> 	mov	edi, eax 
  5149 0000DD67 29C0                <1> 	sub	eax, eax ; 0
  5150                              <1> 		 ; ECX = remain byte count in page (1-4096)
  5151 0000DD69 39CE                <1> 	cmp	esi, ecx
  5152 0000DD6B 7302                <1> 	jnb	short sysbreak_2
  5153 0000DD6D 89F1                <1> 	mov	ecx, esi
  5154                              <1> sysbreak_2:
  5155 0000DD6F 29CE                <1> 	sub	esi, ecx
  5156 0000DD71 01CD                <1> 	add	ebp, ecx
  5157 0000DD73 F3AA                <1> 	rep 	stosb
  5158 0000DD75 09F6                <1> 	or	esi, esi
  5159 0000DD77 75DF                <1> 	jnz	short sysbreak_1
  5160                              <1> 	;
  5161                              <1> 		; bit $1,r1 / is it an odd address
  5162                              <1> 		; beq 2f / no, its even
  5163                              <1> 		; clrb (r1)+ / yes, make it even
  5164                              <1> 	; 2: / clear area between the break point and the stack
  5165                              <1> 		; cmp r1,sp / is it higher or same than the stack
  5166                              <1> 		; bhis 1f / yes, quit
  5167                              <1> 		; clr (r1)+ / clear word
  5168                              <1> 		; br 2b / go back
  5169                              <1> 	;pop	ebx
  5170                              <1> sysbreak_3: ; 1:
  5171                              <1> 	;mov	[u.break], ebx ; virtual address !!!
  5172                              <1> 		; jsr r0,arg; u.break / put the "address" 
  5173                              <1> 			; / in u.break (set new break point)
  5174                              <1> 		; br sysret4 / br sysret
  5175 0000DD79 E991E6FFFF          <1> 	jmp	sysret
  5176                              <1> 
  5177                              <1> sysseek: ; / moves read write pointer in an fsp entry
  5178                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
  5179                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5180                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  5181                              <1> 	;
  5182                              <1> 	; 'sysseek' changes the r/w pointer of (3rd word of in an
  5183                              <1> 	; fsp entry) of an open file whose file descriptor is in u.r0.
  5184                              <1> 	; The file descriptor refers to a file open for reading or
  5185                              <1> 	; writing. The read (or write) pointer is set as follows:
  5186                              <1> 	;	* if 'ptrname' is 0, the pointer is set to offset.
  5187                              <1> 	;	* if 'ptrname' is 1, the pointer is set to its
  5188                              <1> 	;	  current location plus offset.
  5189                              <1> 	;	* if 'ptrname' is 2, the pointer is set to the
  5190                              <1> 	;	  size of file plus offset.
  5191                              <1> 	; The error bit (e-bit) is set for an undefined descriptor.
  5192                              <1> 	;
  5193                              <1> 	; Calling sequence:
  5194                              <1> 	;	sysseek; offset; ptrname
  5195                              <1> 	; Arguments:
  5196                              <1> 	;	offset - number of bytes desired to move 
  5197                              <1> 	;		 the r/w pointer
  5198                              <1> 	;	ptrname - a switch indicated above
  5199                              <1> 	;
  5200                              <1> 	; Inputs: r0 - file descriptor 
  5201                              <1> 	; Outputs: -
  5202                              <1> 	; ...............................................................
  5203                              <1> 	;	
  5204                              <1> 	; Retro UNIX 8086 v1 modification: 
  5205                              <1> 	;       'sysseek' system call has three arguments; so,
  5206                              <1> 	;	* 1st argument, file descriptor is in BX (BL) register
  5207                              <1> 	;	* 2nd argument, offset is in CX register
  5208                              <1> 	;	* 3rd argument, ptrname/switch is in DX (DL) register	
  5209                              <1> 
  5210 0000DD7E E821000000          <1> 	call	seektell
  5211                              <1> 	; EAX = Current R/W pointer of the file
  5212                              <1> 	; EBX = [u.fofp]
  5213                              <1> 	; [u.base] = offset (ECX input)
  5214                              <1> 
  5215 0000DD83 0305[205D0100]      <1> 	add	eax, [u.base]
  5216 0000DD89 8903                <1> 	mov	[ebx], eax
  5217 0000DD8B E97FE6FFFF          <1> 	jmp	sysret
  5218                              <1> 
  5219                              <1> systell: ; / get the r/w pointer
  5220                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0) - temporary !-
  5221                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5222                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  5223                              <1> 	;
  5224                              <1> 	; Retro UNIX 8086 v1 modification:
  5225                              <1> 	; ! 'systell' does not work in original UNIX v1,
  5226                              <1> 	; 	    it returns with error !
  5227                              <1> 	; Inputs: r0 - file descriptor 
  5228                              <1> 	; Outputs: r0 - file r/w pointer
  5229                              <1> 
  5230                              <1> 	;xor	ecx, ecx ; 0
  5231 0000DD90 BA01000000          <1> 	mov	edx, 1 ; 05/08/2013
  5232                              <1> 	;call 	seektell
  5233 0000DD95 E810000000          <1> 	call 	seektell0 ; 05/08/2013
  5234                              <1> 	;; 06/11/2016
  5235                              <1> 	;; mov	eax, [ebx]
  5236 0000DD9A A3[005D0100]        <1> 	mov	[u.r0], eax
  5237 0000DD9F E96BE6FFFF          <1> 	jmp	sysret
  5238                              <1> 
  5239                              <1> ; Original unix v1 'systell' system call:
  5240                              <1> 		; jsr r0,seektell
  5241                              <1> 		; br error4
  5242                              <1> 
  5243                              <1> seektell:
  5244                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
  5245                              <1> 	; 03/01/2016
  5246                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5247                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  5248                              <1> 	;
  5249                              <1> 	; 'seektell' puts the arguments from sysseek and systell
  5250                              <1> 	; call in u.base and u.count. It then gets the i-number of
  5251                              <1> 	; the file from the file descriptor in u.r0 and by calling
  5252                              <1> 	; getf. The i-node is brought into core and then u.count
  5253                              <1> 	; is checked to see it is a 0, 1, or 2.
  5254                              <1> 	; If it is 0 - u.count stays the same
  5255                              <1> 	;          1 - u.count = offset (u.fofp)
  5256                              <1> 	;	   2 - u.count = i.size (size of file)
  5257                              <1> 	; 	 		
  5258                              <1> 	; !! Retro UNIX 8086 v1 modification:
  5259                              <1> 	;	Argument 1, file descriptor is in BX;
  5260                              <1> 	;	Argument 2, offset is in CX;
  5261                              <1> 	;	Argument 3, ptrname/switch is in DX register.	
  5262                              <1> 	;
  5263                              <1> 	; ((Return -> eax = base for offset (position= base+offset))
  5264                              <1> 	;
  5265 0000DDA4 890D[205D0100]      <1> 	mov 	[u.base], ecx ; offset
  5266                              <1> seektell0:
  5267 0000DDAA 8915[245D0100]      <1> 	mov 	[u.count], edx
  5268                              <1> 	; EBX = file descriptor (file number)
  5269 0000DDB0 E898FCFFFF          <1> 	call	getf1
  5270                              <1> 	; EAX = First cluster of the file
  5271                              <1> 	; EBX = File number (Open file number)
  5272                              <1> 	; [u.fofp] = Pointer to File pointer
  5273                              <1> 	; [i.size] = File size
  5274                              <1> 
  5275 0000DDB5 09C0                <1> 	or	eax, eax
  5276 0000DDB7 7514                <1> 	jnz	short seektell1
  5277                              <1> 
  5278 0000DDB9 B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN
  5279 0000DDBE A3[005D0100]        <1> 	mov	[u.r0], eax 
  5280 0000DDC3 A3[645D0100]        <1> 	mov	dword [u.error], eax ; 'file not open !'
  5281 0000DDC8 E922E6FFFF          <1> 	jmp	error
  5282                              <1> 
  5283                              <1> seektell1:
  5284 0000DDCD 8B1D[105D0100]      <1>         mov     ebx, [u.fofp]
  5285 0000DDD3 803D[245D0100]01    <1> 	cmp	byte [u.count], 1
  5286 0000DDDA 7705                <1> 	ja	short seektell2
  5287 0000DDDC 7409                <1> 	je	short seektell3
  5288 0000DDDE 31C0                <1> 	xor	eax, eax
  5289 0000DDE0 C3                  <1> 	retn
  5290                              <1> 
  5291                              <1> seektell2:
  5292 0000DDE1 A1[F15D0100]        <1>         mov   	eax, [i.size]
  5293 0000DDE6 C3                  <1> 	retn
  5294                              <1> 
  5295                              <1> seektell3:
  5296 0000DDE7 8B03                <1> 	mov	eax, [ebx]
  5297 0000DDE9 C3                  <1> 	retn
  5298                              <1> 
  5299                              <1> sysintr: ; / set interrupt handling
  5300                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5301                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  5302                              <1> 	;
  5303                              <1> 	; 'sysintr' sets the interrupt handling value. It puts
  5304                              <1> 	; argument of its call in u.intr then branches into 'sysquit'
  5305                              <1> 	; routine. u.tty is checked if to see if a control tty exists.
  5306                              <1> 	; If one does the interrupt character in the tty buffer is
  5307                              <1> 	; cleared and 'sysret'is called. If one does not exits
  5308                              <1> 	; 'sysret' is just called.	
  5309                              <1> 	;
  5310                              <1> 	; Calling sequence:
  5311                              <1> 	;	sysintr; arg
  5312                              <1> 	; Argument:
  5313                              <1> 	;	arg - if 0, interrupts (ASCII DELETE) are ignored.
  5314                              <1> 	;	    - if 1, intterupts cause their normal result
  5315                              <1> 	;		 i.e force an exit.
  5316                              <1> 	;	    - if arg is a location within the program,
  5317                              <1> 	;		control is passed to that location when
  5318                              <1> 	;		an interrupt occurs.	
  5319                              <1> 	; Inputs: -
  5320                              <1> 	; Outputs: -
  5321                              <1> 	; ...............................................................
  5322                              <1> 	;	
  5323                              <1> 	; Retro UNIX 8086 v1 modification: 
  5324                              <1> 	;       'sysintr' system call sets u.intr to value of BX
  5325                              <1> 	;	then branches into sysquit.
  5326                              <1> 	;
  5327 0000DDEA 66891D[465D0100]    <1> 	mov	[u.intr], bx
  5328                              <1> 		; jsr r0,arg; u.intr / put the argument in u.intr
  5329                              <1> 		; br 1f / go into quit routine
  5330 0000DDF1 E919E6FFFF          <1> 	jmp	sysret
  5331                              <1> 
  5332                              <1> sysquit:
  5333                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5334                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  5335                              <1> 	;
  5336                              <1> 	; 'sysquit' turns off the quit signal. it puts the argument of
  5337                              <1> 	; the call in u.quit. u.tty is checked if to see if a control 
  5338                              <1> 	; tty exists. If one does the interrupt character in the tty
  5339                              <1> 	; buffer is cleared and 'sysret'is called. If one does not exits
  5340                              <1> 	; 'sysret' is just called.	
  5341                              <1> 	;
  5342                              <1> 	; Calling sequence:
  5343                              <1> 	;	sysquit; arg
  5344                              <1> 	; Argument:
  5345                              <1> 	;	arg - if 0, this call diables quit signals from the
  5346                              <1> 	;		typewriter (ASCII FS)
  5347                              <1> 	;	    - if 1, quits are re-enabled and cause execution to
  5348                              <1> 	;		cease and a core image to be produced.
  5349                              <1> 	;		 i.e force an exit.
  5350                              <1> 	;	    - if arg is an addres in the program,
  5351                              <1> 	;		a quit causes control to sent to that
  5352                              <1> 	;		location.	
  5353                              <1> 	; Inputs: -
  5354                              <1> 	; Outputs: -
  5355                              <1> 	; ...............................................................
  5356                              <1> 	;	
  5357                              <1> 	; Retro UNIX 8086 v1 modification: 
  5358                              <1> 	;       'sysquit' system call sets u.quit to value of BX
  5359                              <1> 	;	then branches into 'sysret'.
  5360                              <1> 	;
  5361 0000DDF6 66891D[485D0100]    <1> 	mov	[u.quit], bx
  5362 0000DDFD E90DE6FFFF          <1> 	jmp	sysret
  5363                              <1> 		; jsr r0,arg; u.quit / put argument in u.quit
  5364                              <1> 	;1:
  5365                              <1> 		; mov u.ttyp,r1 / move pointer to control tty buffer
  5366                              <1> 			      ; / to r1
  5367                              <1> 		; beq sysret4 / return to user
  5368                              <1> 		; clrb 6(r1) / clear the interrupt character 
  5369                              <1> 			   ; / in the tty buffer
  5370                              <1> 		; br sysret4 / return to user
  5371                              <1> 
  5372                              <1> syssetuid: ; / set process id
  5373                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5374                              <1> 	; 07/07/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  5375                              <1> 	;
  5376                              <1> 	; 'syssetuid' sets the user id (u.uid) of the current process
  5377                              <1> 	; to the process id in (u.r0). Both the effective user and 
  5378                              <1> 	; u.uid and the real user u.ruid are set to this. 
  5379                              <1> 	; Only the super user can make this call.	
  5380                              <1> 	;
  5381                              <1> 	; Calling sequence:
  5382                              <1> 	;	syssetuid
  5383                              <1> 	; Arguments: -
  5384                              <1> 	;
  5385                              <1> 	; Inputs: (u.r0) - contains the process id.
  5386                              <1> 	; Outputs: -
  5387                              <1> 	; ...............................................................
  5388                              <1> 	;	
  5389                              <1> 	; Retro UNIX 8086 v1 modification: 
  5390                              <1> 	;       BL contains the (new) user ID of the current process
  5391                              <1> 
  5392                              <1> 		; movb *u.r0,r1 / move process id (number) to r1
  5393 0000DE02 3A1D[4D5D0100]      <1> 	cmp	bl, [u.ruid] 
  5394                              <1> 		; cmpb r1,u.ruid / is it equal to the real user 
  5395                              <1> 			       ; / id number
  5396 0000DE08 741E                <1> 	je	short setuid1
  5397                              <1> 		; beq 1f / yes
  5398 0000DE0A 803D[4C5D0100]00    <1> 	cmp	byte [u.uid], 0 ; 02/08/2013
  5399                              <1> 		; tstb u.uid / no, is current user the super user?
  5400                              <1> 	;ja	error
  5401                              <1> 		; bne error4 / no, error
  5402 0000DE11 760F                <1> 	jna	short setuid0
  5403 0000DE13 C705[645D0100]0B00- <1> 	mov	dword [u.error], ERR_NOT_SUPERUSER  ; 11
  5403 0000DE1B 0000                <1>
  5404                              <1> 				;  'permission denied !' error
  5405 0000DE1D E9CDE5FFFF          <1> 	jmp	error
  5406                              <1> setuid0:
  5407 0000DE22 881D[4D5D0100]      <1> 	mov	[u.ruid], bl
  5408                              <1> setuid1: ; 1:
  5409 0000DE28 881D[4C5D0100]      <1> 	mov	[u.uid], bl ; 02/08/2013
  5410                              <1> 		; movb r1,u.uid / put process id in u.uid
  5411                              <1> 		; movb r1,u.ruid / put process id in u.ruid
  5412 0000DE2E E9DCE5FFFF          <1> 	jmp	sysret
  5413                              <1> 		; br sysret4 / system return
  5414                              <1> 
  5415                              <1> sysgetuid: ; < get user id >
  5416                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5417                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  5418                              <1> 	;
  5419                              <1> 	; 'sysgetuid' returns the real user ID of the current process.
  5420                              <1> 	; The real user ID identifies the person who is logged in,
  5421                              <1> 	; in contradistinction to the effective user ID, which
  5422                              <1> 	; determines his access permission at each moment. It is thus
  5423                              <1> 	; useful to programs which operate using the 'set user ID'
  5424                              <1> 	; mode, to find out who invoked them.	
  5425                              <1> 	;
  5426                              <1> 	; Calling sequence:
  5427                              <1> 	;	syssetuid
  5428                              <1> 	; Arguments: -
  5429                              <1> 	;
  5430                              <1> 	; Inputs: -
  5431                              <1> 	; Outputs: (u.r0) - contains the real user's id.
  5432                              <1> 	; ...............................................................
  5433                              <1> 	;	
  5434                              <1> 	; Retro UNIX 8086 v1 modification: 
  5435                              <1> 	;       AL contains the real user ID at return.
  5436                              <1> 	;
  5437 0000DE33 0FB605[4D5D0100]    <1> 	movzx 	eax, byte [u.ruid]
  5438 0000DE3A A3[005D0100]        <1> 	mov	[u.r0], eax
  5439                              <1> 		; movb	u.ruid,*u.r0 / move the real user id to (u.r0)
  5440 0000DE3F E9CBE5FFFF          <1> 	jmp	sysret
  5441                              <1> 		; br sysret4 / systerm return, sysret
  5442                              <1> 
  5443                              <1> anyi: 
  5444                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  5445                              <1> 	; Major Modification!
  5446                              <1> 	; TRDOS 386 does not permit to delete a file while it is open 
  5447                              <1> 	; The role of 'anyi' procedure has beeen changed to ensure that.
  5448                              <1> 	; 	
  5449                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5450                              <1> 	; 25/04/2013 (Retro UNIX 8086 v1)
  5451                              <1> 	;
  5452                              <1> 	; 'anyi' is called if a file deleted while open.
  5453                              <1> 	; "anyi" checks to see if someone else has opened this file.
  5454                              <1> 	;
  5455                              <1> 	; INPUTS ->
  5456                              <1> 	;    r1 - contains an i-number
  5457                              <1> 	;    fsp - start of table containing open files
  5458                              <1> 	;
  5459                              <1> 	; OUTPUTS ->
  5460                              <1> 	;    "deleted" flag set in fsp entry of another occurrence of
  5461                              <1> 	;	   this file and r2 points 1st word of this fsp entry.
  5462                              <1> 	;    if file not found - bit in i-node map is cleared
  5463                              <1> 	;    			 (i-node is freed)
  5464                              <1> 	;               all blocks related to i-node are freed
  5465                              <1> 	;	        all flags in i-node are cleared
  5466                              <1> 	; ((AX = R1)) input
  5467                              <1> 	;
  5468                              <1> 	;    (Retro UNIX Prototype : 02/12/2012, UNIXCOPY.ASM)
  5469                              <1>         ;    ((Modified registers: eDX, eCX, eBX, eSI, eDI, eBP))  
  5470                              <1> 	;
  5471                              <1> 	; / r1 contains an i-number
  5472                              <1> 
  5473                              <1> 	; TRDOS 386 (06/10/2016)
  5474                              <1> 	; 
  5475                              <1> 	; INPUT:
  5476                              <1> 	;	EAX = First Cluster
  5477                              <1> 	;	 DL = Logical DOS Drive Number
  5478                              <1> 	;
  5479                              <1> 	; OUTPUT:
  5480                              <1> 	;	CF = 1 -> EBX = File Handle/Number/Index
  5481                              <1> 	;	CF = 0 -> EBX = 0
  5482                              <1> 	;
  5483                              <1> 	; Modified Registers: EBX
  5484                              <1> 
  5485 0000DE44 31DB                <1> 	xor	ebx, ebx
  5486                              <1> anyi_0: 
  5487 0000DE46 80BB[0A530100]00    <1> 	cmp	byte [ebx+OF_MODE], 0 ; 0 = empty entry
  5488 0000DE4D 770A                <1> 	ja	short anyi_2 ; 1 (r), 2 (w) or 3 (r&w)
  5489                              <1> anyi_1:
  5490 0000DE4F FEC3                <1> 	inc	bl
  5491 0000DE51 80FB0A              <1> 	cmp	bl, OPENFILES ; max. count of open files
  5492 0000DE54 72F0                <1> 	jb	short anyi_0
  5493 0000DE56 31C0                <1> 	xor	eax, eax
  5494 0000DE58 C3                  <1> 	retn 
  5495                              <1> anyi_2:
  5496 0000DE59 3A93[00530100]      <1> 	cmp	dl, [ebx+OF_DRIVE]
  5497 0000DE5F 75EE                <1> 	jne	short anyi_1
  5498 0000DE61 66C1E302            <1> 	shl	bx, 2 ; *4 (dword offset)
  5499 0000DE65 3B83[D8520100]      <1> 	cmp	eax, [ebx+OF_FCLUSTER]
  5500 0000DE6B 7406                <1> 	je	short anyi_3
  5501 0000DE6D 66C1EB02            <1> 	shr	bx, 2 ; /4 (byte offset)
  5502 0000DE71 EBDC                <1> 	jmp	short anyi_1 	
  5503                              <1> anyi_3:
  5504 0000DE73 66C1EB02            <1> 	shr	bx, 2 ; /4 (bytes offset) (index)
  5505 0000DE77 F9                  <1> 	stc
  5506 0000DE78 C3                  <1> 	retn
  5507                              <1> 
  5508                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - u7.s
  5509                              <1> ; Last Modification: 14/11/2015
  5510                              <1> 
  5511                              <1> sysmount: ; / mount file system
  5512                              <1> 	; 24/10/2016 - TRDOS 386 (TRDOS v2.0)
  5513                              <1> 	; temporary !
  5514 0000DE79 B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; drive not ready !
  5515 0000DE7E A3[645D0100]        <1>         mov     [u.error], eax
  5516 0000DE83 A3[005D0100]        <1>         mov     [u.r0], eax 
  5517 0000DE88 E962E5FFFF          <1> 	jmp	error
  5518                              <1> 
  5519                              <1> sysumount: ; / special dismount file system
  5520                              <1> 	; 24/10/2016 - TRDOS 386 (TRDOS v2.0)
  5521                              <1> 	; temporary !
  5522 0000DE8D B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; drive not ready !
  5523 0000DE92 A3[645D0100]        <1>         mov     [u.error], eax
  5524 0000DE97 A3[005D0100]        <1>         mov     [u.r0], eax 
  5525 0000DE9C E94EE5FFFF          <1> 	jmp	error
  5526                              <1> 
  5527                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - SYS9.INC
  5528                              <1> ; Last Modification: 09/12/2015
  5529                              <1> 
  5530                              <1> syssleep:
  5531                              <1> 	; 29/06/2015 - (Retro UNIX 386 v1)
  5532                              <1> 	; 11/06/2014 - (Retro UNIX 8086 v1)
  5533                              <1> 	;
  5534                              <1> 	; Retro UNIX 8086 v1 feature only
  5535                              <1> 	; (INPUT -> none)
  5536                              <1> 	;
  5537 0000DEA1 0FB61D[4F5D0100]    <1> 	movzx	ebx, byte [u.uno] ; process number
  5538 0000DEA8 8AA3[1B5A0100]      <1> 	mov	ah, [ebx+p.ttyc-1] ; current/console tty
  5539 0000DEAE E825120000          <1> 	call	sleep
  5540 0000DEB3 E957E5FFFF          <1> 	jmp	sysret
  5541                              <1> 
  5542                              <1> _vp_clr:
  5543                              <1> 	; Reset/Clear Video Page
  5544                              <1> 	;
  5545                              <1> 	; 30/06/2015 - (Retro UNIX 386 v1)
  5546                              <1> 	; 21/05/2013 - 30/10/2013(Retro UNIX 8086 v1) (U0.ASM)
  5547                              <1> 	;
  5548                              <1> 	; Retro UNIX 8086 v1 feature only !
  5549                              <1> 	;
  5550                              <1> 	; INPUTS -> 
  5551                              <1> 	;   BH = video page number	 
  5552                              <1> 	;
  5553                              <1> 	; OUTPUT ->
  5554                              <1> 	;   none
  5555                              <1> 	; ((Modified registers: eAX, BH, eCX, eDX, eSI, eDI))
  5556                              <1> 	;
  5557                              <1> 	; 04/12/2013
  5558 0000DEB8 28C0                <1> 	sub	al, al
  5559                              <1> 	; al = 0 (clear video page)
  5560                              <1> 	; bh = video page ; 13/05/2016
  5561 0000DEBA B407                <1> 	mov	ah, 07h
  5562                              <1> 	; ah = 7 (attribute/color)
  5563 0000DEBC 6631C9              <1> 	xor 	cx, cx ; 0, left upper column (cl) & row (cl)
  5564 0000DEBF 66BA4F18            <1> 	mov	dx, 184Fh ; right lower column & row (dl=24, dh=79)
  5565 0000DEC3 E8423BFFFF          <1> 	call	_scroll_up
  5566                              <1> 	; bh = video page
  5567 0000DEC8 6631D2              <1> 	xor	dx, dx ; 0 (cursor position) 
  5568 0000DECB E9783EFFFF          <1> 	jmp 	_set_cpos
  5569                              <1> 
  5570                              <1> sysmsg:
  5571                              <1> 	; 13/05/2016
  5572                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  5573                              <1> 	; 01/07/2015 - 11/11/2015 (Retro UNIX 386 v1)
  5574                              <1> 	; Print user-application message on user's console tty
  5575                              <1> 	;
  5576                              <1> 	; Input -> EBX = Message address
  5577                              <1> 	;	   ECX = Message length (max. 255)
  5578                              <1> 	;	   DL = Color (IBM PC Rombios color attributes)
  5579                              <1> 	;
  5580 0000DED0 81F9FF000000        <1> 	cmp	ecx, MAX_MSG_LEN ; 255
  5581 0000DED6 0F8733E5FFFF        <1> 	ja	sysret ; nothing to do with big message size
  5582 0000DEDC 08C9                <1> 	or	cl, cl
  5583 0000DEDE 0F842BE5FFFF        <1> 	jz	sysret
  5584 0000DEE4 20D2                <1> 	and	dl, dl
  5585 0000DEE6 7502                <1> 	jnz	short sysmsg0
  5586 0000DEE8 B207                <1> 	mov	dl, 07h ; default color
  5587                              <1> 		; (black background, light gray character) 
  5588                              <1> sysmsg0:
  5589 0000DEEA 891D[205D0100]      <1> 	mov	[u.base], ebx
  5590 0000DEF0 8815[0F420100]      <1> 	mov	[ccolor], dl ; color attributes
  5591 0000DEF6 89E5                <1> 	mov	ebp, esp
  5592 0000DEF8 31DB                <1> 	xor	ebx, ebx ; 0
  5593 0000DEFA 891D[285D0100]      <1> 	mov	[u.nread], ebx ; 0
  5594                              <1> 	;
  5595 0000DF00 381D[625D0100]      <1> 	cmp	[u.kcall], bl ; 0
  5596 0000DF06 7769                <1> 	ja	short sysmsgk ; Temporary (01/07/2015)
  5597                              <1> 	;
  5598 0000DF08 890D[245D0100]      <1> 	mov	[u.count], ecx
  5599 0000DF0E 41                  <1> 	inc	ecx ; + 00h ; ASCIIZ
  5600 0000DF0F 29CC                <1> 	sub	esp, ecx
  5601 0000DF11 89E7                <1> 	mov	edi, esp
  5602 0000DF13 89E6                <1> 	mov	esi, esp
  5603 0000DF15 66891D[605D0100]    <1> 	mov	[u.pcount], bx ; reset page (phy. addr.) counter
  5604                              <1> 	; 11/11/2015
  5605 0000DF1C 8A25[305D0100]      <1> 	mov 	ah, [u.ttyp] ; recent open tty
  5606                              <1> 	; 0 = none
  5607 0000DF22 FECC                <1> 	dec	ah
  5608 0000DF24 790C                <1> 	jns	short sysmsg1 
  5609 0000DF26 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno] ; process number	
  5610 0000DF2C 8AA3[1B5A0100]      <1> 	mov	ah, [ebx+p.ttyc-1] ; user's (process's) console tty
  5611                              <1> sysmsg1:
  5612 0000DF32 8825[325D0100]      <1> 	mov	[u.ttyn], ah
  5613                              <1> sysmsg2:
  5614 0000DF38 E82F080000          <1> 	call	cpass
  5615 0000DF3D 7416                <1> 	jz	short sysmsg5
  5616 0000DF3F AA                  <1> 	stosb
  5617 0000DF40 20C0                <1> 	and	al, al
  5618 0000DF42 75F4                <1> 	jnz	short sysmsg2
  5619                              <1> sysmsg3:
  5620 0000DF44 80FC07              <1> 	cmp	ah, 7 ; tty number
  5621 0000DF47 7711                <1> 	ja	short sysmsg6 ; serial port
  5622 0000DF49 E83E000000          <1> 	call	print_cmsg
  5623                              <1> sysmsg4:
  5624 0000DF4E 89EC                <1> 	mov	esp, ebp	
  5625 0000DF50 E9BAE4FFFF          <1> 	jmp	sysret
  5626                              <1> sysmsg5:
  5627 0000DF55 C60700              <1> 	mov	byte [edi], 0
  5628 0000DF58 EBEA                <1> 	jmp	short sysmsg3
  5629                              <1> sysmsg6:
  5630 0000DF5A 8A06                <1> 	mov	al, [esi]
  5631 0000DF5C E874110000          <1> 	call	sndc
  5632 0000DF61 72EB                <1> 	jc	short sysmsg4
  5633 0000DF63 803E00              <1> 	cmp	byte [esi], 0  ; 0 is stop character
  5634 0000DF66 76E6                <1> 	jna	short sysmsg4
  5635 0000DF68 46                  <1> 	inc 	esi
  5636 0000DF69 8A25[325D0100]      <1> 	mov	ah, [u.ttyn]
  5637 0000DF6F EBE9                <1> 	jmp	short sysmsg6
  5638                              <1> 
  5639                              <1> sysmsgk: ; Temporary (01/07/2015)
  5640                              <1> 	; The message has been sent by Kernel (ASCIIZ string)
  5641                              <1> 	; (ECX -character count- will not be considered)
  5642 0000DF71 8B35[205D0100]      <1> 	mov	esi, [u.base]
  5643 0000DF77 8A25[0E420100]      <1> 	mov	ah, [ptty] ; present/current screen (video page)
  5644 0000DF7D 8825[325D0100]      <1> 	mov	[u.ttyn], ah
  5645 0000DF83 C605[625D0100]00    <1> 	mov	byte [u.kcall], 0
  5646 0000DF8A EBB8                <1> 	jmp	short sysmsg3
  5647                              <1> 	
  5648                              <1> print_cmsg: 
  5649                              <1> 	; 13/05/2016 - TRDOS 386 (TRDOS v2.0)
  5650                              <1> 	; 01/07/2015 (Retro UNIX 386 v1)
  5651                              <1> 	;
  5652                              <1> 	; print message (on user's console tty) 
  5653                              <1> 	;	with requested color
  5654                              <1> 	;
  5655                              <1> 	; INPUTS:
  5656                              <1> 	;	esi = message address
  5657                              <1> 	;	[u.ttyn] = tty number (0 to 7)
  5658                              <1> 	;	[ccolor] = color attributes (IBM PC BIOS colors)
  5659                              <1> 	
  5660 0000DF8C 8A3D[325D0100]      <1> 	mov	bh, [u.ttyn]
  5661                              <1> 	;mov	bh, ah
  5662                              <1> 
  5663 0000DF92 AC                  <1> 	lodsb
  5664                              <1> pcmsg1:
  5665 0000DF93 56                  <1> 	push 	esi
  5666 0000DF94 8A1D[0F420100]      <1> 	mov	bl, [ccolor]
  5667                              <1> 	;mov	bh, [u.ttyn]
  5668 0000DF9A E8133DFFFF          <1> 	call 	_write_tty
  5669 0000DF9F 5E                  <1> 	pop	esi
  5670 0000DFA0 AC                  <1> 	lodsb
  5671 0000DFA1 20C0                <1> 	and 	al, al  ; 0
  5672 0000DFA3 75EE                <1> 	jnz 	short pcmsg1
  5673 0000DFA5 C3                  <1> 	retn
  5674                              <1> 
  5675                              <1> sysgeterr:
  5676                              <1> 	; 09/12/2015
  5677                              <1> 	; 21/09/2015 - (Retro UNIX 386 v1 feature only!)
  5678                              <1> 	; Get last error number or page fault count
  5679                              <1> 	; (for debugging)
  5680                              <1> 	;
  5681                              <1> 	; Input -> EBX = return type
  5682                              <1> 	;	   0 = last error code (which is in 'u.error')	
  5683                              <1> 	;	   FFFFFFFFh = page fault count for running process
  5684                              <1> 	;	   FFFFFFFEh = total page fault count
  5685                              <1> 	;	   1 .. FFFFFFFDh = undefined 
  5686                              <1> 	;
  5687                              <1> 	; Output -> EAX = last error number or page fault count
  5688                              <1> 	;	   (depending on EBX input)
  5689                              <1> 	; 	
  5690 0000DFA6 21DB                <1> 	and 	ebx, ebx
  5691 0000DFA8 750B                <1> 	jnz	short glerr_2
  5692                              <1> glerr_0:
  5693 0000DFAA A1[645D0100]        <1> 	mov	eax, [u.error]
  5694                              <1> glerr_1:
  5695 0000DFAF A3[005D0100]        <1> 	mov	[u.r0], eax
  5696 0000DFB4 C3                  <1>  	retn
  5697                              <1> glerr_2:
  5698 0000DFB5 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0, FFFFFFFEh -> FFFFFFFFh
  5699 0000DFB6 74FD                <1> 	jz	short glerr_2 ; page fault count for process
  5700 0000DFB8 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0	
  5701 0000DFB9 75EF                <1> 	jnz	short glerr_0
  5702 0000DFBB A1[1C5F0100]        <1> 	mov	eax, [PF_Count] ; total page fault count
  5703 0000DFC0 EBED                <1>         jmp     short glerr_1
  5704                              <1> glerr_3:
  5705 0000DFC2 A1[685D0100]        <1> 	mov 	eax, [u.pfcount]
  5706 0000DFC7 EBE6                <1> 	jmp	short glerr_1
  5707                              <1> 
  5708                              <1> load_and_run_file:
  5709                              <1> 	; 22/01/2017
  5710                              <1> 	; 07/01/2017
  5711                              <1> 	; 04/01/2017
  5712                              <1> 	; 24/10/2016
  5713                              <1> 	; 24/04/2016, 02/05/2016, 03/05/2016, 06/05/2016
  5714                              <1> 	; 23/04/2016 (TRDOS 386 = TRDOS v2.0)
  5715                              <1> 	; 23/10/2015 (Retro UNIX 386 v1, 'sysexec')
  5716                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  5717                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
  5718                              <1> 	; EAX = First Cluster number
  5719                              <1> 	; EDX = File Size
  5720                              <1> 	; ESI = Argument list address
  5721                              <1> 	; [argc] = argument count
  5722                              <1> 	; [u.nread] = argument list length
  5723                              <1> 	; [esp] = return address to the caller (*)
  5724                              <1> 	;
  5725 0000DFC9 8935[E85D0100]      <1> 	mov	[argv], esi
  5726 0000DFCF 8915[F15D0100]      <1> 	mov	[i.size], edx
  5727 0000DFD5 A3[ED5D0100]        <1> 	mov	[ii], eax
  5728                              <1> 
  5729                              <1> 	;sti	; 07/01/2017
  5730                              <1> 	;mov	eax, [k_page_dir]
  5731                              <1> 	;mov	[u.pgdir], eax
  5732 0000DFDA 31C0                <1> 	xor 	eax, eax ; clc ; *** ; 04/01/2017
  5733                              <1> 	;mov	[u.r0], eax ; 0 ; 07/01/2017
  5734                              <1> 
  5735                              <1> 	; 06/05/2016
  5736                              <1> 	; Set 'sysexit' return order to MainProg
  5737                              <1> 	;
  5738 0000DFDC 58                  <1> 	pop	eax ; * 'loc_load_and_run_file_8:' address
  5739                              <1> 	;; 22/01/2017
  5740                              <1> 	;;cli ; 07/01/2017
  5741 0000DFDD 8B25[7C410100]      <1> 	mov	esp, [tss.esp0]
  5742                              <1> 	;
  5743                              <1> 	; 'loc_load_run_file_8' address has 
  5744                              <1> 	; 'jmp loc_file_rw_restore_retn' instruction
  5745                              <1> 	; 'loc_file_rw_restore_retn:' will return to
  5746                              <1> 	; [mainprog_return_addr] 
  5747                              <1> 	; just after 'call command_interpreter'
  5748                              <1> 	;
  5749 0000DFE3 68[9B620000]        <1> 	push	_end_of_mainprog ; we must not return to here !
  5750 0000DFE8 FF35[644F0100]      <1> 	push	dword [mainprog_return_addr]
  5751 0000DFEE 89E5                <1> 	mov	ebp, esp ; **
  5752                              <1> 	;	
  5753 0000DFF0 9C                  <1> 	pushfd  ; EFLAGS      ; IRETD ; ***
  5754 0000DFF1 6A08                <1> 	push	KCODE ; cs    ; IRETD
  5755 0000DFF3 50                  <1> 	push	eax ; * (eip) ; IRETD
  5756 0000DFF4 8925[F85C0100]      <1> 	mov	[u.sp], esp
  5757                              <1> 	;mov	byte [u.quant], time_count
  5758 0000DFFA 1E                  <1> 	push	ds
  5759 0000DFFB 06                  <1> 	push	es
  5760 0000DFFC 0FA0                <1> 	push	fs
  5761 0000DFFE 0FA8                <1> 	push	gs	
  5762                              <1> 	;mov	eax, [u.r0]
  5763 0000E000 29C0                <1> 	sub	eax, eax
  5764 0000E002 60                  <1> 	pushad
  5765 0000E003 68[0FC40000]        <1> 	push	sysret
  5766                              <1> 	;push	sysrel1 ; 07/01/2017
  5767 0000E008 8925[FC5C0100]      <1> 	mov	[u.usp], esp
  5768                              <1> 	;
  5769 0000E00E E85E060000          <1> 	call	wswap ; Save MainProg (process 1) 'u' structure
  5770                              <1> 		      ; and registers for return (from program)	
  5771 0000E013 89EC                <1> 	mov	esp, ebp ; **
  5772                              <1> 	;;22/01/2017
  5773                              <1> 	;;sti ; 07/01/2017
  5774 0000E015 50                  <1> 	push	eax  ; * 'loc_load_and_run_file_8:' address
  5775                              <1> 	;
  5776                              <1> 	;;; 02/05/2016
  5777                              <1> 	;;; Create a new process (parent: MainProg)	
  5778 0000E016 31F6                <1> 	xor 	esi, esi
  5779                              <1> cnpm_1: ; search p.stat table for unused process number
  5780 0000E018 46                  <1> 	inc	esi
  5781 0000E019 80BE[4B5A0100]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE
  5782                              <1> 				; is process active, unused, dead
  5783 0000E020 760B                <1> 	jna	short cnpm_2	; it's unused so branch
  5784 0000E022 6683FE10            <1> 	cmp	si, nproc 	; all processes checked
  5785 0000E026 72F0                <1> 	jb	short cnpm_1    ; no, branch back
  5786 0000E028 E9E482FFFF          <1> 	jmp	panic 
  5787                              <1> cnpm_2:
  5788 0000E02D A1[545D0100]        <1> 	mov	eax, [u.pgdir] ; page directory of MainProg
  5789 0000E032 A3[585D0100]        <1> 	mov	[u.ppgdir], eax ; parent's page directory
  5790 0000E037 E83D6BFFFF          <1> 	call	allocate_page
  5791 0000E03C 0F82CF82FFFF        <1> 	jc	panic
  5792                              <1> 	; EAX = UPAGE (user structure page) address
  5793 0000E042 A3[505D0100]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
  5794 0000E047 89F7                <1> 	mov	edi, esi
  5795 0000E049 66C1E702            <1> 	shl	di, 2
  5796 0000E04D 8987[585A0100]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
  5797 0000E053 E89B6BFFFF          <1> 	call	clear_page ; 03/05/2016
  5798                              <1> 	;movzx	eax, byte [p.ttyc] ; console tty (for MainProg)
  5799 0000E058 6629C0              <1> 	sub	ax, ax ; 0
  5800 0000E05B 668986[1B5A0100]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
  5801                              <1> 				   ; ah - reset child's wait channel	
  5802 0000E062 89F0                <1> 	mov	eax, esi
  5803 0000E064 A2[4F5D0100]        <1> 	mov	[u.uno], al ; child process number
  5804 0000E069 FE86[4B5A0100]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN
  5805 0000E06F 66D1E6              <1> 	shl	si, 1 ; multiply si by 2 to get index into p.pid table
  5806 0000E072 66FF05[EA5C0100]    <1> 	inc	word [mpid] ; increment m.pid; get a new process name
  5807 0000E079 66A1[EA5C0100]      <1> 	mov	ax, [mpid]
  5808 0000E07F 668986[BA590100]    <1> 	mov	[esi+p.pid-2], ax ; put new process name 
  5809                              <1> 				  ; in child process' name slot
  5810                              <1> 	;mov	ax, [p.pid]  ; get process name of MainProg
  5811 0000E086 66B80100            <1> 	mov	ax, 1
  5812 0000E08A 668986[DA590100]    <1> 	mov	[esi+p.ppid-2], ax ; put parent process name 
  5813                              <1> 			           ; in parent process slot for child
  5814 0000E091 6648                <1> 	dec	ax ; 0
  5815 0000E093 66A3[305D0100]      <1> 	mov 	[u.ttyp], ax ; 0
  5816                              <1> 	;;;
  5817 0000E099 A1[ED5D0100]        <1> 	mov 	eax,  [ii]
  5818                              <1> 	; Retro UNIX 386 v1, 'sysexec' (u2.s)
  5819 0000E09E E82F100000          <1> 	call	iopen
  5820                              <1> 	; 06/06/2016
  5821 0000E0A3 C605[455D0100]01    <1> 	mov	byte [u.pri], 1 ; normal priority
  5822                              <1> 	;
  5823 0000E0AA EB0A                <1> 	jmp	short sysexec_7 ; 02/05/2016
  5824                              <1> 
  5825                              <1> sysexec_6:
  5826                              <1> 	; 04/01/2017
  5827                              <1> 	; 24/10/2016
  5828                              <1> 	;;02/05/2016
  5829                              <1> 	; 23/04/2016
  5830                              <1> 	; 18/10/2015 ('sysexec_6')
  5831                              <1> 	; 23/06/2015
  5832 0000E0AC A1[545D0100]        <1> 	mov	eax, [u.pgdir] ; physical address of page directory
  5833                              <1> 	;;cmp 	eax, [k_page_dir] ; TRDOS MainProg ? 
  5834                              <1> 	;;je	short sysexec_7
  5835 0000E0B1 E8FC6BFFFF          <1> 	call	deallocate_page_dir
  5836                              <1> sysexec_7:
  5837 0000E0B6 E82C6BFFFF          <1> 	call	make_page_dir
  5838 0000E0BB 0F825082FFFF        <1> 	jc	panic  ; allocation error 
  5839                              <1> 		       ; after a deallocation would be nonsence !?
  5840                              <1> 	; 24/07/2015
  5841                              <1> 	; map kernel pages (1st 4MB) to PDE 0
  5842                              <1> 	;     of the user's page directory
  5843                              <1> 	;     (It is needed for interrupts!)
  5844                              <1> 	; 18/10/2015
  5845 0000E0C1 8B15[E0410100]      <1> 	mov	edx, [k_page_dir] ; Kernel's page directory
  5846 0000E0C7 8B02                <1> 	mov	eax, [edx] ; physical address of
  5847                              <1> 			   ; kernel's first page table (1st 4 MB)
  5848                              <1> 			   ; (PDE 0 of kernel's page directory)
  5849 0000E0C9 8B15[545D0100]      <1> 	mov 	edx, [u.pgdir]
  5850 0000E0CF 8902                <1> 	mov	[edx], eax ; PDE 0 (1st 4MB)
  5851                              <1> 	;
  5852                              <1> 	; 20/07/2015
  5853 0000E0D1 BB00004000          <1> 	mov	ebx, CORE ; start address = 0 (virtual) + CORE
  5854                              <1> 	; 18/10/2015
  5855 0000E0D6 BE[D85D0100]        <1> 	mov	esi, pcore ; physical start address
  5856                              <1> sysexec_8:	
  5857 0000E0DB B907000000          <1> 	mov	ecx, PDE_A_USER + PDE_A_WRITE + PDE_A_PRESENT
  5858 0000E0E0 E8206BFFFF          <1> 	call	make_page_table
  5859 0000E0E5 0F822682FFFF        <1> 	jc	panic
  5860                              <1> 	;mov	ecx, PTE_A_USER + PTE_A_WRITE + PTE_A_PRESENT
  5861 0000E0EB E8236BFFFF          <1> 	call	make_page ; make new page, clear and set the pte 
  5862 0000E0F0 0F821B82FFFF        <1> 	jc	panic
  5863                              <1> 	;
  5864 0000E0F6 8906                <1> 	mov	[esi], eax ; 24/06/2015
  5865                              <1> 	; ebx = virtual address (24/07/2015)
  5866 0000E0F8 E8BB70FFFF          <1> 	call 	add_to_swap_queue
  5867                              <1> 	; 18/10/2015
  5868 0000E0FD 81FE[DC5D0100]      <1> 	cmp	esi, ecore ; user's stack (last) page ?
  5869 0000E103 740C                <1> 	je	short sysexec_9 ; yes
  5870 0000E105 BE[DC5D0100]        <1> 	mov	esi, ecore  ; physical address of the last page 
  5871                              <1> 	; 20/07/2015
  5872 0000E10A BB00F0FFFF          <1> 	mov	ebx, (ECORE - PAGE_SIZE) + CORE
  5873                              <1> 	; ebx = virtual end address + segment base address - 4K
  5874 0000E10F EBCA                <1>         jmp     short sysexec_8
  5875                              <1> sysexec_9:
  5876                              <1> 	; 24/04/2016
  5877                              <1> 	; 18/10/2015
  5878                              <1> 	; 26/08/2015
  5879                              <1> 	; 25/06/2015
  5880                              <1> 	; move arguments from kernel stack to [ecore]
  5881                              <1> 	; (argument list/line will be copied from kernel stack
  5882                              <1> 	; frame to the last (stack) page of user's core memory)
  5883                              <1> 	; 18/10/2015
  5884 0000E111 8B3D[DC5D0100]      <1> 	mov	edi, [ecore]
  5885 0000E117 81C700100000        <1> 	add	edi, PAGE_SIZE
  5886 0000E11D 0FB705[E65D0100]    <1> 	movzx	eax, word [argc]
  5887 0000E124 09C0                <1> 	or	eax, eax
  5888 0000E126 7509                <1> 	jnz	short sysexec_10
  5889 0000E128 89FB                <1> 	mov 	ebx, edi
  5890 0000E12A 83EB04              <1> 	sub	ebx, 4 
  5891 0000E12D 8903                <1> 	mov	[ebx], eax ; 0
  5892 0000E12F EB44                <1> 	jmp 	short sysexec_13
  5893                              <1> sysexec_10:
  5894 0000E131 8B0D[285D0100]      <1> 	mov	ecx, [u.nread]
  5895                              <1> 	;mov	esi, TextBuffer
  5896 0000E137 8B35[E85D0100]      <1> 	mov	esi, [argv] ; 24/04/2016 (TRDOS 386  = TRDOS v2.0)
  5897 0000E13D 29CF                <1> 	sub	edi, ecx ; page end address - argument list length
  5898 0000E13F 89C2                <1> 	mov	edx, eax
  5899 0000E141 FEC2                <1> 	inc	dl ; argument count + 1 for argc value  
  5900 0000E143 C0E202              <1> 	shl 	dl, 2  ; 4 * (argument count + 1)
  5901 0000E146 89FB                <1> 	mov	ebx, edi
  5902 0000E148 80E3FC              <1> 	and	bl, 0FCh ; 32 bit (dword) alignment
  5903 0000E14B 29D3                <1> 	sub 	ebx, edx
  5904 0000E14D 89FA                <1> 	mov	edx, edi
  5905 0000E14F F3A4                <1> 	rep	movsb
  5906 0000E151 89D6                <1> 	mov 	esi, edx
  5907 0000E153 89DF                <1> 	mov 	edi, ebx
  5908 0000E155 BA00F0BFFF          <1> 	mov	edx, ECORE - PAGE_SIZE ; virtual addr. of the last page
  5909 0000E15A 2B15[DC5D0100]      <1> 	sub 	edx, [ecore] ; difference (virtual - physical) 
  5910 0000E160 AB                  <1> 	stosd	; eax = argument count	
  5911                              <1> sysexec_11:
  5912 0000E161 89F0                <1> 	mov	eax, esi
  5913 0000E163 01D0                <1> 	add	eax, edx
  5914 0000E165 AB                  <1> 	stosd  ; eax = virtual address
  5915 0000E166 FE0D[E65D0100]      <1> 	dec	byte [argc]
  5916 0000E16C 7407                <1> 	jz	short sysexec_13
  5917                              <1> sysexec_12:
  5918 0000E16E AC                  <1> 	lodsb
  5919 0000E16F 20C0                <1> 	and	al, al
  5920 0000E171 75FB                <1> 	jnz	short sysexec_12
  5921 0000E173 EBEC                <1> 	jmp	short sysexec_11
  5922                              <1> sysexec_13:
  5923                              <1> 	; 24/10/2016
  5924                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
  5925                              <1> 	; 23/06/2015 - 19/10/2015 (Retro UNIX 386 v1, 'sysexec_13')
  5926                              <1> 	;
  5927                              <1> 	; moving arguments to [ecore] is OK here..
  5928                              <1> 	;
  5929                              <1> 	; ebx = beginning addres of argument list pointers
  5930                              <1> 		;	in user's stack
  5931 0000E175 2B1D[DC5D0100]      <1> 	sub 	ebx, [ecore]
  5932 0000E17B 81C300F0BFFF        <1> 	add     ebx, (ECORE - PAGE_SIZE)
  5933                              <1> 			; end of core - 4096 (last page)
  5934                              <1> 			; (virtual address)
  5935 0000E181 891D[E85D0100]      <1> 	mov	[argv], ebx
  5936 0000E187 891D[2C5D0100]      <1> 	mov	[u.break], ebx ; available user memory
  5937                              <1> 	;
  5938 0000E18D 29C0                <1> 	sub	eax, eax
  5939 0000E18F C705[245D0100]2000- <1> 	mov	dword [u.count], 32 ; Executable file header size
  5939 0000E197 0000                <1>
  5940 0000E199 C705[105D0100]-     <1> 	mov	dword [u.fofp], u.off
  5940 0000E19F [1C5D0100]          <1>
  5941 0000E1A3 A3[1C5D0100]        <1> 	mov	[u.off], eax ; 0
  5942 0000E1A8 A3[205D0100]        <1> 	mov	[u.base], eax ; 0, start of user's core (virtual)
  5943                              <1> 	; 24/10/2016
  5944 0000E1AD A0[A6420100]        <1> 	mov	al, [Current_Drv]
  5945 0000E1B2 A2[E25C0100]        <1> 	mov	[cdev], al
  5946                              <1> 	;
  5947 0000E1B7 A1[ED5D0100]        <1> 	mov	eax, [ii] ; Fist Cluster of the Program (PRG) file
  5948                              <1> 	; EAX = First cluster of the executable file
  5949 0000E1BC E832010000          <1> 	call	readi
  5950                              <1> 
  5951 0000E1C1 8B0D[2C5D0100]      <1> 	mov	ecx, [u.break] ; top of user's stack (physical addr.)
  5952 0000E1C7 890D[245D0100]      <1> 	mov	[u.count], ecx ; save for overrun check
  5953                              <1> 	;
  5954 0000E1CD 8B0D[285D0100]      <1> 	mov	ecx, [u.nread]
  5955 0000E1D3 890D[2C5D0100]      <1> 	mov	[u.break], ecx ; virtual address (offset from start)
  5956 0000E1D9 80F920              <1> 	cmp	cl, 32
  5957 0000E1DC 7540                <1>         jne     short sysexec_15
  5958                              <1> 	;:
  5959                              <1> 	; Retro UNIX 386 v1 (32 bit) executable file header format
  5960 0000E1DE 8B35[D85D0100]      <1> 	mov	esi, [pcore] ; start address of user's core memory 
  5961                              <1> 		             ; (phys. start addr. of the exec. file)
  5962 0000E1E4 AD                  <1> 	lodsd
  5963 0000E1E5 663DEB1E            <1> 	cmp	ax, 1EEBh ; EBH, 1Eh -> jump to +32
  5964 0000E1E9 7533                <1> 	jne	short sysexec_15
  5965 0000E1EB AD                  <1> 	lodsd
  5966 0000E1EC 89C1                <1> 	mov	ecx, eax ; text (code) section size
  5967 0000E1EE AD                  <1> 	lodsd
  5968 0000E1EF 01C1                <1> 	add	ecx, eax ; + data section size (initialized data)
  5969 0000E1F1 89CB                <1> 	mov	ebx, ecx
  5970 0000E1F3 AD                  <1> 	lodsd	
  5971 0000E1F4 01C3                <1> 	add	ebx, eax ; + bss section size (for overrun checking)
  5972 0000E1F6 3B1D[245D0100]      <1> 	cmp	ebx, [u.count]
  5973 0000E1FC 7711                <1> 	ja	short sysexec_14  ; program overruns stack !
  5974                              <1> 	;
  5975                              <1> 	; add bss section size to [u.break]
  5976 0000E1FE 0105[2C5D0100]      <1> 	add 	[u.break], eax
  5977                              <1> 	;
  5978 0000E204 83E920              <1> 	sub	ecx, 32  ; header size (already loaded)
  5979                              <1> 	;cmp	ecx, [u.count]
  5980                              <1> 	;jnb	short sysexec_16
  5981 0000E207 890D[245D0100]      <1> 	mov	[u.count], ecx ; required read count
  5982 0000E20D EB29                <1> 	jmp	short sysexec_16
  5983                              <1> sysexec_14:
  5984                              <1> 	; insufficient (out of) memory
  5985 0000E20F C705[645D0100]0400- <1> 	mov	dword [u.error], ERR_MINOR_IM ; 1
  5985 0000E217 0000                <1>
  5986 0000E219 E9D1E1FFFF          <1> 	jmp	error
  5987                              <1> sysexec_15:
  5988 0000E21E 8B15[F15D0100]      <1>         mov	edx, [i.size] ; file size
  5989 0000E224 29CA                <1> 	sub	edx, ecx ; file size - loaded bytes
  5990 0000E226 7626                <1> 	jna	short sysexec_17 ; no need to next read
  5991 0000E228 01D1                <1> 	add	ecx, edx ; [i.size]
  5992 0000E22A 3B0D[245D0100]      <1> 	cmp	ecx, [u.count] ; overrun check (!)
  5993 0000E230 77DD                <1> 	ja	short sysexec_14
  5994 0000E232 8915[245D0100]      <1> 	mov	[u.count], edx
  5995                              <1> sysexec_16:
  5996 0000E238 A1[ED5D0100]        <1> 	mov	eax, [ii] ; first cluster
  5997 0000E23D E8B1000000          <1> 	call	readi
  5998 0000E242 8B0D[285D0100]      <1> 	mov	ecx, [u.nread]
  5999 0000E248 010D[2C5D0100]      <1> 	add	[u.break], ecx
  6000                              <1> sysexec_17:
  6001 0000E24E A1[ED5D0100]        <1> 	mov	eax, [ii] ; first cluster
  6002 0000E253 E87B0E0000          <1> 	call	iclose
  6003 0000E258 31C0                <1> 	xor     eax, eax
  6004 0000E25A FEC0                <1> 	inc	al
  6005 0000E25C 66A3[465D0100]      <1> 	mov	[u.intr], ax ; 1 (interrupt/time-out is enabled)
  6006 0000E262 66A3[485D0100]      <1> 	mov	[u.quit], ax ; 1 ('crtl+brk' signal is enabled) 
  6007 0000E268 833D[585D0100]00    <1>         cmp	dword [u.ppgdir], 0  ; is the caller MainProg (kernel) ?
  6008 0000E26F 770C                <1> 	ja	short sysexec_18 ; no, the caller is user process
  6009                              <1> 	; If the caller is kernel (MainProg), 'sysexec' will come here
  6010 0000E271 8B15[E0410100]      <1> 	mov	edx, [k_page_dir] ; kernel's page directory
  6011 0000E277 8915[585D0100]      <1> 	mov	[u.ppgdir], edx ; next time 'sysexec' must not come here 
  6012                              <1> sysexec_18:
  6013                              <1> 	; 02/05/2016
  6014                              <1> 	; 24/04/2016 (TRDOS 386 = TRDOS v2.0)
  6015                              <1> 	; 18/10/2015 (Retro UNIX 386 v1)
  6016                              <1> 	; 05/08/2015
  6017                              <1> 	; 29/07/2015
  6018 0000E27D 8B2D[E85D0100]      <1> 	mov	ebp, [argv] ; user's stack pointer must point to argument
  6019                              <1> 			    ; list pointers (argument count)
  6020 0000E283 FA                  <1> 	cli
  6021 0000E284 8B25[7C410100]      <1>         mov     esp, [tss.esp0]  ; ring 0 (kernel) stack pointer
  6022                              <1> 	;mov   	esp, [u.sp] ; Restore Kernel stack
  6023                              <1> 			    ; for this process	 
  6024                              <1> 	;add	esp, 20 ; --> EIP, CS, EFLAGS, ESP, SS
  6025                              <1> 	;xor	eax, eax ; 0
  6026 0000E28A FEC8                <1> 	dec	al ; eax = 0
  6027 0000E28C 66BA2300            <1> 	mov	dx, UDATA
  6028 0000E290 6652                <1> 	push	dx  ; user's stack segment
  6029 0000E292 55                  <1> 	push	ebp ; user's stack pointer
  6030                              <1> 		    ; (points to number of arguments)
  6031                              <1> 	
  6032                              <1> 	; 04/01/2017
  6033                              <1> 	; MainProg comes here while [sysflg]= 0FFh
  6034                              <1> 	; (but sysexec comes here while [sysflg]= 0)
  6035 0000E293 C605[F75C0100]00    <1> 	mov	byte [sysflg], 0 ; 04/01/2017
  6036                              <1> 				 ; (timer_int sysflg control)
  6037 0000E29A FB                  <1> 	sti
  6038 0000E29B 9C                  <1> 	pushfd	; EFLAGS
  6039                              <1> 		; Set IF for enabling interrupts in user mode	
  6040                              <1> 	;or	dword [esp], 200h 
  6041                              <1> 	;
  6042                              <1> 	;mov	bx, UCODE
  6043                              <1> 	;push	bx ; user's code segment
  6044 0000E29C 6A1B                <1> 	push	UCODE
  6045                              <1> 	;push	0
  6046 0000E29E 50                  <1> 	push	eax ; EIP (=0) - start address -	
  6047 0000E29F 8925[F85C0100]      <1> 	mov	[u.sp], esp ; 29/07/2015
  6048                              <1> 	; 05/08/2015
  6049                              <1> 	; Remedy of a General Protection Fault during 'iretd' is here !
  6050                              <1> 	; ('push dx' would cause to general protection fault, 
  6051                              <1> 	; after 'pop ds' etc.)
  6052                              <1> 	;
  6053                              <1> 	;; push dx ; ds (UDATA)
  6054                              <1> 	;; push dx ; es (UDATA)
  6055                              <1> 	;; push dx ; fs (UDATA)
  6056                              <1> 	;; push dx ; gs (UDATA)
  6057                              <1> 	;
  6058                              <1> 	; This is a trick to prevent general protection fault
  6059                              <1> 	; during 'iretd' intruction at the end of 'sysrele' (in u1.s):
  6060 0000E2A5 8EC2                <1> 	mov 	es, dx ; UDATA
  6061 0000E2A7 06                  <1> 	push 	es ; ds (UDATA)
  6062 0000E2A8 06                  <1> 	push 	es ; es (UDATA)
  6063 0000E2A9 06                  <1> 	push 	es ; fs (UDATA)
  6064 0000E2AA 06                  <1> 	push	es ; gs (UDATA)
  6065 0000E2AB 66BA1000            <1> 	mov	dx, KDATA
  6066 0000E2AF 8EC2                <1> 	mov	es, dx
  6067                              <1> 	;
  6068                              <1> 	;; pushad simulation
  6069 0000E2B1 89E5                <1> 	mov	ebp, esp ; esp before pushad
  6070 0000E2B3 50                  <1> 	push	eax ; eax (0)
  6071 0000E2B4 50                  <1> 	push	eax ; ecx (0)
  6072 0000E2B5 50                  <1> 	push	eax ; edx (0)
  6073 0000E2B6 50                  <1> 	push	eax ; ebx (0)
  6074 0000E2B7 55                  <1> 	push	ebp ; esp before pushad
  6075 0000E2B8 50                  <1> 	push	eax ; ebp (0)
  6076 0000E2B9 50                  <1> 	push	eax ; esi (0)		
  6077 0000E2BA 50                  <1> 	push	eax ; edi (0)	
  6078                              <1> 	;
  6079 0000E2BB A3[005D0100]        <1> 	mov	[u.r0], eax ; eax = 0
  6080 0000E2C0 8925[FC5C0100]      <1> 	mov	[u.usp], esp
  6081                              <1> 
  6082                              <1> 	; 02/05/2016
  6083                              <1> 	;inc	byte [sysflg] ; 0FFh -> 0
  6084                              <1> 	;mov	byte [sysflg], 0 ; 04/01/2017
  6085 0000E2C6 0FB61D[4F5D0100]    <1> 	movzx	ebx, byte [u.uno]	
  6086 0000E2CD 6683BB[DA590100]01  <1> 	cmp	word [ebx+p.ppid-2], 1 ; MainProg
  6087 0000E2D5 0F8736E1FFFF        <1> 	ja	sysret0 ; 03/05/2016
  6088 0000E2DB 68[0FC40000]        <1> 	push	sysret ; * 
  6089 0000E2E0 8925[FC5C0100]      <1> 	mov	[u.usp], esp
  6090 0000E2E6 E886030000          <1> 	call	wswap ; save child process 'u' structure and
  6091                              <1> 		      ; registers
  6092 0000E2EB 8305[FC5C0100]04    <1> 	add	dword [u.usp], 4 ; 03/05/2016 
  6093                              <1> sysexec_19: ; 02/05/2016
  6094 0000E2F2 C3                  <1> 	retn ; * 'sysret' ; byte [sysflg] -> 0FFh
  6095                              <1> 
  6096                              <1> readi:
  6097                              <1> 	; 01/05/2016
  6098                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  6099                              <1> 	; 20/05/2015 - Retro UNIX 386 v1
  6100                              <1> 	; 11/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  6101                              <1> 	;
  6102                              <1> 	; Reads from a file whose the first cluster number in EAX
  6103                              <1> 	; 
  6104                              <1> 	; INPUTS ->
  6105                              <1> 	;    EAX - First cluster number of the file
  6106                              <1> 	;    u.count - byte count user desires
  6107                              <1> 	;    u.base - points to user buffer
  6108                              <1> 	;    u.fofp - points to dword with current file offset
  6109                              <1> 	;    i.size - file size
  6110                              <1> 	;    cdev - logical dos drive number of the file
  6111                              <1> 	; OUTPUTS ->
  6112                              <1> 	;    u.count - cleared
  6113                              <1> 	;    u.nread - accumulates total bytes passed back
  6114                              <1> 	;
  6115                              <1> 	; ((EAX)) input/output
  6116                              <1> 	; (Retro UNIX Prototype : 14/12/2012 - 01/03/2013, UNIXCOPY.ASM)
  6117                              <1>         ; ((Modified registers: edx, ebx, ecx, esi, edi))  
  6118                              <1> 
  6119 0000E2F3 31D2                <1> 	xor	edx, edx ; 0
  6120 0000E2F5 8915[285D0100]      <1> 	mov 	[u.nread], edx ; 0
  6121 0000E2FB 668915[605D0100]    <1> 	mov	[u.pcount], dx ; 19/05/2015
  6122 0000E302 3915[245D0100]      <1> 	cmp 	[u.count], edx ; 0
  6123 0000E308 7701                <1> 	ja 	short readi_1
  6124 0000E30A C3                  <1> 	retn
  6125                              <1> readi_1:
  6126                              <1> dskr:
  6127                              <1> 	; 01/05/2016
  6128                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  6129                              <1> 	; 24/05/2015 - 12/10/2015 (Retro UNIX 386 v1)
  6130                              <1> 	; 26/04/2013 - 03/08/2013 (Retro UNIX 8086 v1)
  6131                              <1> dskr_0:
  6132 0000E30B 8B15[F15D0100]      <1>         mov	edx, [i.size]
  6133 0000E311 8B1D[105D0100]      <1> 	mov	ebx, [u.fofp]
  6134 0000E317 2B13                <1> 	sub	edx, [ebx]
  6135 0000E319 7647                <1> 	jna	short dskr_4
  6136                              <1> 	;
  6137 0000E31B 50                  <1> 	push	eax ; 01/05/2016
  6138 0000E31C 3B15[245D0100]      <1> 	cmp     edx, [u.count] 
  6139 0000E322 7306                <1> 	jnb	short dskr_1
  6140 0000E324 8915[245D0100]      <1> 	mov	[u.count], edx
  6141                              <1> dskr_1:
  6142                              <1> 	; EAX = First Cluster
  6143                              <1> 	; [Current_Drv] = Physical drive number 
  6144 0000E32A E83B000000          <1> 	call	mget_r
  6145                              <1> 	; NOTE: in 'mget_r', relevant sector will be read in buffer
  6146                              <1> 	; if it is not already in buffer !
  6147 0000E32F BB[285F0100]        <1> 	mov	ebx, readi_buffer
  6148 0000E334 803D[625D0100]00    <1> 	cmp	byte [u.kcall], 0 ; the caller is 'namei' sign (=1)
  6149 0000E33B 770F                <1> 	ja	short dskr_3	  ; zf=0 -> the caller is 'namei'
  6150 0000E33D 66833D[605D0100]00  <1> 	cmp	word [u.pcount], 0
  6151 0000E345 7705                <1> 	ja	short dskr_3
  6152                              <1> dskr_2:
  6153                              <1> 	; [u.base] = virtual address to transfer (as destination address)
  6154 0000E347 E894010000          <1> 	call	trans_addr_w ; translate virtual address to physical (w)
  6155                              <1> dskr_3:
  6156                              <1> 	; EBX (r5) = system (I/O) buffer address -physical-
  6157 0000E34C E8F7010000          <1> 	call	sioreg
  6158 0000E351 87F7                <1> 	xchg	esi, edi
  6159                              <1> 	; EDI = file (user data) offset
  6160                              <1> 	; ESI = sector (I/O) buffer offset
  6161                              <1> 	; ECX = byte count
  6162 0000E353 F3A4                <1> 	rep	movsb
  6163                              <1> 	; eax = remain bytes in buffer
  6164                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
  6165 0000E355 09C0                <1> 	or	eax, eax
  6166 0000E357 75EE                <1> 	jnz	short dskr_2 ; (page end before system buffer end!)		
  6167 0000E359 58                  <1> 	pop	eax  ; (first cluster number)
  6168 0000E35A 390D[245D0100]      <1> 	cmp	[u.count], ecx ; 0
  6169 0000E360 77A9                <1> 	ja	short dskr_0
  6170                              <1> dskr_4:
  6171 0000E362 C605[625D0100]00    <1> 	mov	byte [u.kcall], 0
  6172 0000E369 C3                  <1> 	retn
  6173                              <1> 
  6174                              <1> mget_r:
  6175                              <1> 	; 24/10/2016
  6176                              <1> 	; 22/10/2016
  6177                              <1> 	; 12/10/2016
  6178                              <1> 	; 29/04/2016
  6179                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  6180                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
  6181                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  6182                              <1> 	;
  6183                              <1> 	; Get existing or (allocate) a new disk block for file
  6184                              <1> 	; 
  6185                              <1> 	; INPUTS ->
  6186                              <1> 	;    [u.fofp] = file offset pointer
  6187                              <1> 	;    EAX = First Cluster
  6188                              <1> 	;    [cdev] = Logical dos drive number 	  
  6189                              <1> 	;    ([u.off] = file offset)
  6190                              <1> 	; OUTPUTS ->
  6191                              <1> 	;    EAX = logical sector number
  6192                              <1> 	;    ESI = Logical Dos Drive Description Table address	
  6193                              <1> 	;
  6194                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI
  6195                              <1> 
  6196 0000E36A 8B35[105D0100]      <1> 	mov     esi, [u.fofp]
  6197 0000E370 8B1E                <1> 	mov	ebx, [esi] ; (u.off)
  6198                              <1> 
  6199 0000E372 29C9                <1> 	sub	ecx, ecx
  6200 0000E374 8A2D[E25C0100]      <1> 	mov	ch, [cdev]
  6201                              <1> 
  6202 0000E37A BE00010900          <1> 	mov	esi, Logical_DOSDisks
  6203 0000E37F 01CE                <1> 	add	esi, ecx
  6204                              <1> 
  6205 0000E381 380D[184F0100]      <1> 	cmp	[readi.valid], cl ; 0
  6206 0000E387 7649                <1> 	jna	short mget_r_0
  6207                              <1> 	
  6208 0000E389 3A2D[194F0100]      <1> 	cmp	ch, [readi.drv]
  6209 0000E38F 7541                <1> 	jne	short mget_r_0
  6210                              <1> 
  6211 0000E391 3B05[2C4F0100]      <1> 	cmp	eax, [readi.fclust]
  6212 0000E397 7565                <1> 	jne	short mget_r_3
  6213                              <1> 	
  6214 0000E399 89D8                <1> 	mov	eax, ebx ; file offset
  6215 0000E39B 668B0D[204F0100]    <1> 	mov	cx, [readi.bpc]
  6216 0000E3A2 41                  <1> 	inc	ecx ; <= 65536
  6217 0000E3A3 29D2                <1> 	sub	edx, edx
  6218 0000E3A5 F7F1                <1> 	div	ecx
  6219                              <1> 
  6220 0000E3A7 8B3D[284F0100]      <1> 	mov	edi, [readi.c_index] ; cluster index
  6221                              <1> 
  6222 0000E3AD 39F8                <1> 	cmp	eax, edi
  6223 0000E3AF 757A                <1>         jne     short mget_r_4  ; (*)
  6224                              <1> 
  6225                              <1> 	; edx = byte offset in cluster (<= 65535)
  6226 0000E3B1 668915[224F0100]    <1> 	mov	[readi.offset], dx
  6227 0000E3B8 66C1EA09            <1> 	shr	dx, 9 ; / 512
  6228 0000E3BC 8815[1B4F0100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
  6229                              <1> 	
  6230 0000E3C2 A1[244F0100]        <1> 	mov	eax, [readi.cluster]  ; > 0 if [readi.valid] = 1
  6231 0000E3C7 8B15[304F0100]      <1> 	mov	edx, [readi.fs_index]
  6232 0000E3CD E99A000000          <1>         jmp     mget_r_7
  6233                              <1> 	
  6234                              <1> mget_r_0:
  6235 0000E3D2 882D[194F0100]      <1> 	mov	[readi.drv], ch ; physical drive number
  6236 0000E3D8 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  6237 0000E3DC 7707                <1> 	ja	short mget_r_1
  6238 0000E3DE 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
  6239 0000E3E1 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
  6240 0000E3E3 EB03                <1> 	jmp	short mget_r_2	
  6241                              <1> mget_r_1:
  6242 0000E3E5 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]
  6243                              <1> mget_r_2:
  6244 0000E3E8 880D[1A4F0100]      <1> 	mov	[readi.spc], cl  ; sectors per cluster
  6245                              <1> 	; NOTE: readi bytes per sector value is always 512 ! 
  6246 0000E3EE 66C1E109            <1> 	shl	cx, 9 ; * 512
  6247 0000E3F2 6649                <1> 	dec	cx ; bytes per cluster - 1
  6248 0000E3F4 66890D[204F0100]    <1> 	mov	[readi.bpc], cx
  6249 0000E3FB 6629C9              <1> 	sub	cx, cx
  6250                              <1> mget_r_3:
  6251 0000E3FE A3[2C4F0100]        <1> 	mov	[readi.fclust], eax ; first cluster (or FDT address)
  6252 0000E403 880D[184F0100]      <1> 	mov	[readi.valid], cl ; 0 
  6253                              <1> 	;mov	[readi.s_index], cl ; 0
  6254                              <1> 	;mov	[readi.offset], cx ; 0
  6255 0000E409 890D[284F0100]      <1> 	mov	[readi.c_index], ecx ; 0
  6256 0000E40F 890D[244F0100]      <1> 	mov	[readi.cluster], ecx ; 0
  6257 0000E415 890D[1C4F0100]      <1> 	mov	[readi.sector], ecx ; 0
  6258                              <1> 	
  6259 0000E41B 89D8                <1> 	mov	eax, ebx ; file offset
  6260 0000E41D 668B0D[204F0100]    <1> 	mov	cx, [readi.bpc]
  6261 0000E424 41                  <1> 	inc	ecx ; <= 65536
  6262 0000E425 29D2                <1> 	sub	edx, edx
  6263 0000E427 F7F1                <1> 	div	ecx
  6264                              <1> 	;mov	edi, [readi.c_index] ; previous cluster index
  6265 0000E429 29FF                <1> 	sub	edi, edi
  6266                              <1> mget_r_4:
  6267 0000E42B A3[284F0100]        <1> 	mov	[readi.c_index], eax ; cluster index
  6268                              <1> 	; edx = byte offset in cluster (<= 65535)
  6269 0000E430 668915[224F0100]    <1> 	mov	[readi.offset], dx
  6270 0000E437 66C1EA09            <1> 	shr	dx, 9 ; / 512
  6271 0000E43B 8815[1B4F0100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
  6272                              <1> 
  6273 0000E441 89C1                <1> 	mov	ecx, eax ; current cluster index
  6274 0000E443 A1[2C4F0100]        <1> 	mov	eax, [readi.fclust]
  6275 0000E448 09C9                <1> 	or	ecx, ecx ; cluster index
  6276 0000E44A 741B                <1> 	jz	short mget_r_6
  6277                              <1> 
  6278 0000E44C 39CF                <1> 	cmp	edi, ecx
  6279 0000E44E 7710                <1> 	ja	short mget_r_5 ; old cluster index is higher
  6280 0000E450 8B15[244F0100]      <1> 	mov	edx, [readi.cluster]
  6281 0000E456 21D2                <1> 	and	edx, edx
  6282 0000E458 7406                <1> 	jz	short mget_r_5
  6283                              <1> 	; valid 'readi' parameters (*)
  6284 0000E45A 89D0                <1> 	mov	eax, edx
  6285 0000E45C 29F9                <1> 	sub	ecx, edi
  6286 0000E45E 740C                <1> 	jz	short mget_r_7
  6287                              <1> mget_r_5:
  6288                              <1> 	; EAX = Beginning cluster
  6289                              <1> 	; EDX = Sector index in disk/file section
  6290                              <1> 	;	(Only for SINGLIX file system!)
  6291                              <1> 	; ECX = Cluster sequence number after the beginning cluster
  6292                              <1> 	; ESI = Logical DOS Drive Description Table address
  6293 0000E460 E827DEFFFF          <1> 	call	get_cluster_by_index
  6294 0000E465 724E                <1> 	jc	short mget_r_err
  6295                              <1> 	; EAX = Cluster number		
  6296                              <1> mget_r_6:
  6297 0000E467 A3[244F0100]        <1> 	mov	[readi.cluster], eax ; FDT number for Singlix File System
  6298                              <1> mget_r_7:
  6299 0000E46C 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  6300 0000E470 765F                <1> 	jna	short mget_r_12
  6301                              <1> 
  6302 0000E472 83E802              <1> 	sub	eax, 2
  6303 0000E475 0FB615[1A4F0100]    <1> 	movzx	edx, byte [readi.spc]
  6304 0000E47C F7E2                <1> 	mul	edx
  6305                              <1> 
  6306 0000E47E 034668              <1> 	add	eax, [esi+LD_DATABegin]
  6307 0000E481 8A15[1B4F0100]      <1> 	mov	dl, [readi.s_index]
  6308 0000E487 01D0                <1> 	add	eax, edx
  6309                              <1> mget_r_8:
  6310                              <1> 	; eax = logical sector number
  6311 0000E489 803D[184F0100]00    <1> 	cmp	byte [readi.valid], 0
  6312 0000E490 7608                <1> 	jna	short mget_r_9
  6313 0000E492 3B05[1C4F0100]      <1> 	cmp	eax, [readi.sector]
  6314 0000E498 7436                <1> 	je	short mget_r_11 ; sector is already in 'readi' buffer
  6315                              <1> mget_r_9:
  6316 0000E49A A3[1C4F0100]        <1> 	mov	[readi.sector], eax
  6317 0000E49F BB[285F0100]        <1> 	mov	ebx, readi_buffer ; buffer address
  6318 0000E4A4 B901000000          <1> 	mov	ecx, 1
  6319                              <1> 	; 29/04/2016
  6320                              <1> 	;xor	dl, dl
  6321                              <1> 
  6322                              <1> 	; EAX = Logical sector number
  6323                              <1> 	; ECX = Sector count
  6324                              <1> 	; EBX = Buffer address
  6325                              <1> 	; (EDX = 0)
  6326                              <1> 	; ESI = Logical DOS drive description table address	
  6327                              <1> 
  6328 0000E4A9 E83B0C0000          <1> 	call	disk_read
  6329 0000E4AE 7314                <1> 	jnc	short mget_r_10
  6330                              <1> 
  6331                              <1> 	; 22/10/2016 (15h -> 17)
  6332 0000E4B0 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
  6333                              <1> mget_r_err:
  6334 0000E4B5 A3[645D0100]        <1> 	mov	[u.error], eax
  6335                              <1> 	; 12/10/2016
  6336 0000E4BA A3[005D0100]        <1> 	mov	[u.r0], eax
  6337 0000E4BF E92BDFFFFF          <1> 	jmp	error
  6338                              <1> mget_r_10:
  6339 0000E4C4 C605[184F0100]01    <1> 	mov	byte [readi.valid], 1 ; 24/10/2016
  6340 0000E4CB A1[1C4F0100]        <1> 	mov	eax, [readi.sector]
  6341                              <1> mget_r_11:
  6342 0000E4D0 C3                  <1> 	retn
  6343                              <1> mget_r_12:
  6344                              <1> 	; EAX = FDT number
  6345                              <1> 	; EDX = Sector index from FDT sector (0,1,2,3,4...)
  6346 0000E4D1 40                  <1> 	inc	eax ; the first data sector in FS disk section	
  6347 0000E4D2 8915[304F0100]      <1> 	mov	[readi.fs_index], edx
  6348 0000E4D8 01D0                <1> 	add	eax, edx
  6349 0000E4DA EBAD                <1> 	jmp	short mget_r_8
  6350                              <1> 
  6351                              <1> trans_addr_r:
  6352                              <1> 	; 12/10/2016
  6353                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
  6354                              <1> 	; Translate virtual address to physical address 
  6355                              <1> 	; for reading from user's memory space
  6356                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
  6357                              <1> 
  6358 0000E4DC 31D2                <1> 	xor	edx, edx ; 0 (read access sign)
  6359 0000E4DE EB04                <1> 	jmp 	short trans_addr_rw
  6360                              <1> 
  6361                              <1> trans_addr_w:
  6362                              <1> 	; 12/10/2016
  6363                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6364                              <1> 	; Translate virtual address to physical address 
  6365                              <1> 	; for writing to user's memory space
  6366                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
  6367                              <1> 	
  6368 0000E4E0 29D2                <1> 	sub	edx, edx
  6369 0000E4E2 FEC2                <1> 	inc	dl ; 1 (write access sign)
  6370                              <1> trans_addr_rw:
  6371 0000E4E4 50                  <1> 	push	eax
  6372 0000E4E5 53                  <1> 	push	ebx
  6373 0000E4E6 52                  <1> 	push 	edx ; r/w sign (in DL)
  6374                              <1> 	;
  6375 0000E4E7 8B1D[205D0100]      <1> 	mov	ebx, [u.base]
  6376 0000E4ED E89C6DFFFF          <1> 	call	get_physical_addr ; get physical address
  6377 0000E4F2 730F                <1> 	jnc	short passc_0
  6378 0000E4F4 A3[645D0100]        <1> 	mov	[u.error], eax
  6379 0000E4F9 A3[005D0100]        <1> 	mov	[u.r0], eax ; 12/10/2016
  6380                              <1> 	;pop	edx
  6381                              <1> 	;pop 	ebx
  6382                              <1> 	;pop	eax
  6383 0000E4FE E9ECDEFFFF          <1> 	jmp	error
  6384                              <1> passc_0:
  6385 0000E503 F6C202              <1> 	test	dl, PTE_A_WRITE ; writable page
  6386 0000E506 5A                  <1> 	pop	edx
  6387 0000E507 751C                <1> 	jnz	short passc_1
  6388                              <1> 	
  6389 0000E509 20D2                <1> 	and 	dl, dl
  6390 0000E50B 7418                <1> 	jz	short passc_1
  6391                              <1> 	; read only (duplicated) page -must be copied to a new page-
  6392                              <1> 	; EBX = linear address
  6393 0000E50D 51                  <1> 	push 	ecx
  6394 0000E50E E8146AFFFF          <1> 	call 	copy_page
  6395 0000E513 59                  <1> 	pop	ecx
  6396 0000E514 721E                <1> 	jc	short passc_2
  6397 0000E516 50                  <1> 	push	eax ; physical address of the new/allocated page
  6398 0000E517 E89C6CFFFF          <1> 	call	add_to_swap_queue	
  6399 0000E51C 58                  <1> 	pop	eax
  6400 0000E51D 81E3FF0F0000        <1> 	and 	ebx, PAGE_OFF ; 0FFFh
  6401                              <1> 	;mov 	ecx, PAGE_SIZE
  6402                              <1> 	;sub	ecx, ebx 
  6403 0000E523 01D8                <1> 	add	eax, ebx  
  6404                              <1> passc_1: 
  6405 0000E525 A3[5C5D0100]        <1> 	mov 	[u.pbase], eax ; physical address	
  6406 0000E52A 66890D[605D0100]    <1> 	mov	[u.pcount], cx ; remain byte count in page (1-4096)
  6407 0000E531 5B                  <1> 	pop	ebx
  6408 0000E532 58                  <1> 	pop	eax
  6409 0000E533 C3                  <1> 	retn
  6410                              <1> passc_2:
  6411 0000E534 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; "Insufficient memory !" error
  6412 0000E539 A3[005D0100]        <1> 	mov	[u.r0], eax ; 12/10/2016
  6413 0000E53E A3[645D0100]        <1> 	mov	dword [u.error], eax
  6414                              <1> 	;pop 	ebx
  6415                              <1> 	;pop	eax
  6416 0000E543 E9A7DEFFFF          <1> 	jmp	error
  6417                              <1> 
  6418                              <1> sioreg: 
  6419                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6420                              <1> 	; 19/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
  6421                              <1> 	; 12/03/2013 - 22/07/2013 (Retro UNIX 8086 v1)
  6422                              <1> 	; INPUTS -> 
  6423                              <1> 	;     EBX = system buffer (data) address (r5)
  6424                              <1> 	;     [u.fofp] = pointer to file offset pointer
  6425                              <1> 	;     [u.base] = virtual address of the user buffer
  6426                              <1> 	;     [u.pbase] = physical address of the user buffer
  6427                              <1> 	;     [u.count] = byte count
  6428                              <1> 	;     [u.pcount] = byte count within page frame 			
  6429                              <1> 	; OUTPUTS -> 
  6430                              <1> 	;     ESI = user data offset (r1)
  6431                              <1> 	;     EDI = system (I/O) buffer offset (r2)
  6432                              <1> 	;     ECX = byte count (r3)
  6433                              <1> 	;     EAX = remain bytes after byte count within page frame
  6434                              <1> 	;	(If EAX > 0, transfer will continue from the next page)
  6435                              <1>         ;
  6436                              <1> 	; ((Modified registers:  EDX))
  6437                              <1>  
  6438 0000E548 8B35[105D0100]      <1>         mov     esi, [u.fofp]
  6439 0000E54E 8B3E                <1>         mov     edi, [esi]
  6440 0000E550 89F9                <1> 	mov	ecx, edi
  6441 0000E552 81C900FEFFFF        <1> 	or	ecx, 0FFFFFE00h
  6442 0000E558 81E7FF010000        <1> 	and	edi, 1FFh
  6443 0000E55E 01DF                <1> 	add	edi, ebx ; EBX = system buffer (data) address
  6444 0000E560 F7D9                <1> 	neg	ecx
  6445 0000E562 3B0D[245D0100]      <1> 	cmp	ecx, [u.count]
  6446 0000E568 7606                <1> 	jna	short sioreg_0
  6447 0000E56A 8B0D[245D0100]      <1> 	mov	ecx, [u.count]
  6448                              <1> sioreg_0:
  6449 0000E570 803D[625D0100]00    <1> 	cmp	byte [u.kcall], 0 
  6450 0000E577 7613                <1> 	jna	short sioreg_1
  6451                              <1> 	 ; the caller is 'mkdir' or 'namei'
  6452 0000E579 A1[205D0100]        <1> 	mov	eax, [u.base]
  6453 0000E57E A3[5C5D0100]        <1> 	mov 	[u.pbase], eax ; physical address = virtual address
  6454 0000E583 66890D[605D0100]    <1> 	mov	word [u.pcount], cx ; remain bytes in buffer (1 sector)
  6455 0000E58A EB0B                <1> 	jmp	short sioreg_2
  6456                              <1> sioreg_1:
  6457 0000E58C 0FB715[605D0100]    <1> 	movzx	edx, word [u.pcount]
  6458 0000E593 39D1                <1> 	cmp	ecx, edx	
  6459 0000E595 772A                <1> 	ja	short sioreg_4 ; transfer count > [u.pcount]
  6460                              <1> sioreg_2: ; 2:
  6461 0000E597 31C0                <1> 	xor 	eax, eax
  6462                              <1> sioreg_3:
  6463 0000E599 010D[285D0100]      <1> 	add 	[u.nread], ecx
  6464 0000E59F 290D[245D0100]      <1> 	sub 	[u.count], ecx
  6465 0000E5A5 010D[205D0100]      <1> 	add 	[u.base], ecx
  6466 0000E5AB 010E                <1>         add 	[esi], ecx 
  6467 0000E5AD 8B35[5C5D0100]      <1> 	mov	esi, [u.pbase]
  6468 0000E5B3 66290D[605D0100]    <1> 	sub	[u.pcount], cx
  6469 0000E5BA 010D[5C5D0100]      <1> 	add	[u.pbase], ecx
  6470 0000E5C0 C3                  <1>         retn
  6471                              <1> sioreg_4:
  6472                              <1> 	; transfer count > [u.pcount] 
  6473                              <1> 	; (ecx > edx)
  6474 0000E5C1 89C8                <1> 	mov	eax, ecx
  6475 0000E5C3 29D0                <1> 	sub	eax, edx ; remain bytes for 1 sector (block) transfer 
  6476 0000E5C5 89D1                <1> 	mov	ecx, edx ; current transfer count = [u.pcount]
  6477 0000E5C7 EBD0                <1> 	jmp	short sioreg_3
  6478                              <1> 
  6479                              <1> tswitch: ; Retro UNIX 386 v1
  6480                              <1> tswap:
  6481                              <1> 	; 16/01/2017
  6482                              <1> 	; 21/05/2016 - TRDOS 386 (TRDOS v2.0)
  6483                              <1> 	; 10/05/2015 - 01/09/2015 (Retro UNIX 386 v1)
  6484                              <1> 	; 14/04/2013 - 14/02/2014 (Retro UNIX 8086 v1)
  6485                              <1> 	; time out swap, called when a user times out.
  6486                              <1> 	; the user is put on the low priority queue.
  6487                              <1> 	; This is done by making a link from the last user
  6488                              <1> 	; on the low priority queue to him via a call to 'putlu'.
  6489                              <1> 	; then he is swapped out.
  6490                              <1> 
  6491                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 21/05/2016 **
  6492                              <1> 	;     * when a high priority (event) process will be stopped
  6493                              <1> 	;	(swapped out, swithched out/off), 'tswap/tswitch' will
  6494                              <1> 	;	not add it to a run queue. 
  6495                              <1> 	;	/// What for: Process may be already in a run queue, 
  6496                              <1> 	;	it is unspeficied state because process might be started
  6497                              <1> 	;	by a timer event which does not regard previous priority
  6498                              <1> 	;	level and run queue of the process (for fast executing!).
  6499                              <1> 	;	After the 'run for event', process will be sequenced
  6500                              <1> 	;	to run by it's actual run queue. ///
  6501                              <1> 	;
  6502                              <1> 	; Retro UNIX 386 v1 modification ->
  6503                              <1> 	;       swap (software task switch) is performed by changing
  6504                              <1> 	;	user's page directory (u.pgdir) instead of segment change
  6505                              <1> 	;	as in Retro UNIX 8086 v1.
  6506                              <1> 	;
  6507                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6508                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6509                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6510                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6511                              <1> 	;	compatibles was using 1MB segmented memory 
  6512                              <1> 	;	in 8086/8088 times.
  6513                              <1> 	;
  6514                              <1> 	; INPUTS ->
  6515                              <1> 	;    u.uno - users process number
  6516                              <1> 	;    runq+4 - lowest priority queue
  6517                              <1> 	; OUTPUTS ->
  6518                              <1> 	;    r0 - users process number
  6519                              <1> 	;    r2 - lowest priority queue address
  6520                              <1> 	;
  6521                              <1> 	; ((AX = R0, BX = R2)) output
  6522                              <1> 	; ((Modified registers: EDX, EBX, ECX, ESI, EDI))  	
  6523                              <1> 	;
  6524                              <1> 
  6525                              <1> 	NOTE:
  6526                              <1> 	;* [u.pri] priority level is specified by run queue which is process 
  6527                              <1> 	;  comes to run from.
  6528                              <1> 	;* Initial [u.pri] is 1 ('normal/regular') for programs 
  6529                              <1> 	;  (which are launched by MainProg or 'sysexec'), it is changed
  6530                              <1> 	;  to 2 ('high') by timer event, if program uses 'systimer' system call.
  6531                              <1> 	;* Program (Process) also can change it's running priority 
  6532                              <1> 	;  from 1 to 0 or up to 2 by using 'syspri' system call; but,
  6533                              <1> 	;  if program selects priority level 2 (high) for running, next time 
  6534                              <1> 	;  it is reduced to 1 (normal/regular) because 'syspri' adds this
  6535                              <1> 	;  program to 'run for normal' queue while running duration is a bit
  6536                              <1> 	;  protected from swap/switch out immediate, behalf of other high 
  6537                              <1> 	;  priority process in sequence. Program (with high priority) will not 
  6538                              <1> 	;  be swapped/switched out (by timer event) before it's time quantum 
  6539                              <1> 	;  will be elapsed, but, this will be temporary if program is not using 
  6540                              <1> 	;  timer event function.	  			 	
  6541                              <1> 
  6542                              <1> 	;For example:
  6543                              <1> 	;If a process frequently gets a timer event, it runs at high priority
  6544                              <1> 	;level but when it returns from running it returns to actual run queue,
  6545                              <1> 	;not to 'run for event' queue again.
  6546                              <1> 	;'tswap' will not change the sequence at return/stop(swap out) stage.
  6547                              <1> 	;But if priority level not high (=2, 'run for event'), 'tswap/tswitch'
  6548                              <1> 	;will add the stopping process to relevant run queue according to
  6549                              <1> 	;[u.pri] priority level.
  6550                              <1> 
  6551                              <1> 	; 16/01/2017
  6552 0000E5C9 BB[F05C0100]        <1> 	mov	ebx, runq+2 	; 'runq_normal' ; normal/regular priority
  6553                              <1> 	; 21/05/2016
  6554                              <1> 	;cmp	byte [u.pri], 2	; high priority (run for event) ?
  6555                              <1> 	;jnb	short swap
  6556                              <1> 	; 16/01/2017
  6557                              <1> 	; (Normal and also high/event priority processes will be added to
  6558                              <1> 	; normal priority run queue for ensuring circular running sequence!)
  6559                              <1> 	; (Timer interrupt or 'syspri' system call may change priority and run
  6560                              <1> 	; queue to high/event level.)
  6561 0000E5CE 803D[455D0100]00    <1> 	cmp	byte [u.pri], 0
  6562 0000E5D5 7702                <1> 	ja	short tswap_1	; normal priority run queue
  6563                              <1> 	;
  6564 0000E5D7 43                  <1> 	inc	ebx
  6565 0000E5D8 43                  <1> 	inc	ebx		; runq+4, 'runq_background', low priority
  6566                              <1> tswap_1:
  6567 0000E5D9 A0[4F5D0100]        <1> 	mov 	al, [u.uno]
  6568                              <1> 	       	; movb u.uno,r1 / move users process number to r1
  6569                              <1> 		; mov  $runq+4,r2 
  6570                              <1> 			; / move lowest priority queue address to r2
  6571                              <1>       	; ebx = run queue
  6572 0000E5DE E8FE000000          <1> 	call 	putlu
  6573                              <1> 		; jsr r0,putlu / create link from last user on Q to 
  6574                              <1> 		             ; / u.uno's user
  6575                              <1> 
  6576                              <1> switch: ; Retro UNIX 386 v1
  6577                              <1> swap:
  6578                              <1> 	; 02/01/2017
  6579                              <1> 	; 21/05/2016
  6580                              <1> 	; 20/05/2016
  6581                              <1> 	; 02/05/2016
  6582                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6583                              <1> 	; 10/05/2015 - 02/09/2015 (Retro UNIX 386 v1)
  6584                              <1> 	; 14/04/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6585                              <1> 	;
  6586                              <1> 	; 'swap' is routine that controls the swapping of processes
  6587                              <1> 	; in and out of core.
  6588                              <1> 	;
  6589                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 20/05/2016 **
  6590                              <1> 	;     * 3 different priority level is applied 
  6591                              <1> 	;	(just as original unix v1)
  6592                              <1> 	;	1) high priority (event) run queue, 'runq_event'
  6593                              <1> 	;	2) normal priority (regular) run queue, 'runq_normal'
  6594                              <1> 	;	3) low priority (background) run queue, 'runq_backgroud'
  6595                              <1> 	;	'swap' code will run a process which has max. priority
  6596                              <1>         ;       (for earliest event at first)
  6597                              <1> 	;
  6598                              <1> 	; Retro UNIX 386 v1 modification ->
  6599                              <1> 	;       swap (software task switch) is performed by changing
  6600                              <1> 	;	user's page directory (u.pgdir) instead of segment change
  6601                              <1> 	;	as in Retro UNIX 8086 v1.
  6602                              <1> 	;
  6603                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6604                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6605                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6606                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6607                              <1> 	;	compatibles was using 1MB segmented memory 
  6608                              <1> 	;	in 8086/8088 times.
  6609                              <1> 	;
  6610                              <1> 	; INPUTS ->
  6611                              <1> 	;    runq table - contains processes to run.
  6612                              <1> 	;    p.link - contains next process in line to be run.
  6613                              <1> 	;    u.uno - process number of process in core	
  6614                              <1> 	;    s.stack - swap stack used as an internal stack for swapping.	
  6615                              <1> 	; OUTPUTS ->
  6616                              <1> 	;    (original unix v1 -> present process to its disk block)
  6617                              <1> 	;    (original unix v1 -> new process into core -> 
  6618                              <1> 	;	   Retro Unix 8086 v1 -> segment registers changed 
  6619                              <1> 	;	   for new process)
  6620                              <1> 	;    u.quant = 3 (Time quantum for a process)
  6621                              <1> 	; 	((INT 1Ch count down speed -> 18.2 times per second)	 	
  6622                              <1> 	;    RETRO UNIX 8086 v1 will use INT 1Ch (18.2 times per second)
  6623                              <1> 	;	 for now, it will swap the process if there is not
  6624                              <1> 	;	 a keyboard event (keystroke) (Int 15h, function 4Fh)
  6625                              <1> 	;	 or will count down from 3 to 0 even if there is a
  6626                              <1> 	;        keyboard event locking due to repetitive key strokes.
  6627                              <1> 	;	 u.quant will be reset to 3 for RETRO UNIX 8086 v1.
  6628                              <1> 	;
  6629                              <1> 	; ((Modified registers: EAX, EDX, EBX, ECX, ESI, EDI))  	
  6630                              <1> 
  6631                              <1> 	;NOTE:
  6632                              <1> 	;High priority queue is the first for selecting a process to run.
  6633                              <1> 	;If there is not a process in high priority level run queue,
  6634                              <1> 	;a process in normal priority run queue will be selected
  6635                              <1> 	;or a proces in low priority run queue will be selected if normal
  6636                              <1> 	;priority level run queue is empty.
  6637                              <1> 	
  6638                              <1> 	; 21/05/2016 -(3 priority levels, 3 run queues)
  6639 0000E5E3 BE[EE5C0100]        <1> 	mov	esi, runq ; 'runq_event' ; high priority, 'run for event'
  6640 0000E5E8 C605[744F0100]03    <1> 	mov	byte [priority], 3 ; high priority + 1
  6641 0000E5EF 31DB                <1> 	xor	ebx, ebx ; 02/01/2017
  6642                              <1> swap_0: ; 1: / search runq table for highest priority process
  6643 0000E5F1 66AD                <1> 	lodsw  ; mov ax, [esi], add esi+2
  6644                              <1> 	;xor	ebx, ebx ; 02/05/2016
  6645 0000E5F3 6621C0              <1> 	and 	ax, ax ; are there any processes to run in this Q entry
  6646 0000E5F6 750E                <1> 	jnz	short swap_2 
  6647                              <1> 	; 21/05/2026
  6648                              <1> 	; runq_normal = runq+2, runq_background = runq+4
  6649 0000E5F8 FE0D[744F0100]      <1> 	dec	byte [priority] ; 3 -> 3, 2 -> 1, 1-> 0
  6650 0000E5FE 75F1                <1> 	jnz	short swap_0	
  6651                              <1> 	;cmp	esi, runq+6  ; if zero compare address to end of table
  6652                              <1> 	;jb	short swap_0 ; if not at end, go back
  6653                              <1> swap_1:
  6654                              <1> 	; 02/05/2016
  6655                              <1> 	; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
  6656                              <1> 	; No user process to run...
  6657                              <1> 	; Run the kernel process... MainProg: Internal Command Interpreter  
  6658 0000E600 FEC0                <1> 	inc	al ; mov al, 1  ; process number of MainProg
  6659 0000E602 FEC3                <1> 	inc	bl ; mov bl, al ; 1
  6660 0000E604 EB1E                <1> 	jmp	short swap_4
  6661                              <1> swap_2:
  6662                              <1> 	; 21/05/2016
  6663 0000E606 FE0D[744F0100]      <1> 	dec	byte [priority] ; priority level of present user/process
  6664                              <1> 			        ; 0, 1, 2	   
  6665 0000E60C 4E                  <1> 	dec	esi
  6666 0000E60D 4E                  <1>         dec     esi
  6667                              <1> 	;
  6668 0000E60E 88C3                <1> 	mov	bl, al
  6669 0000E610 38E0                <1> 	cmp	al, ah ; is there only 1 process in the queue to be run
  6670 0000E612 740A                <1> 	je	short swap_3 ; yes
  6671 0000E614 8AA3[3B5A0100]      <1> 	mov	ah, [ebx+p.link-1] 
  6672 0000E61A 8826                <1>        	mov	[esi], ah ; move next process in line into run queue
  6673 0000E61C EB06                <1> 	jmp	short swap_4
  6674                              <1> swap_3: 
  6675 0000E61E 6631D2              <1> 	xor	dx, dx
  6676 0000E621 668916              <1> 	mov	[esi], dx ; zero the entry; no processes on the Q
  6677                              <1> swap_4: 
  6678 0000E624 8A25[4F5D0100]      <1> 	mov 	ah, [u.uno]
  6679 0000E62A 38C4                <1> 	cmp	ah, al ;is this process the same as the process in core?
  6680 0000E62C 743B                <1>        	je	short swap_8 ; yes, don't have to swap
  6681 0000E62E 08E4                <1> 	or	ah, ah  ; is the process # = 0
  6682 0000E630 740D                <1>        	jz	short swap_6 ; 'sysexit'
  6683                              <1> 	;cmp	ah, al ;is this process the same as the process in core?
  6684                              <1>        	;je	short swap_8 ; yes, don't have to swap
  6685 0000E632 8925[FC5C0100]      <1> 	mov	[u.usp], esp ; return  address for 'syswait' & 'sleep'
  6686 0000E638 E834000000          <1> 	call	wswap   ; write out core to disk
  6687 0000E63D EB1C                <1> 	jmp 	short swap_7
  6688                              <1> swap_6:
  6689                              <1> 	; Deallocate memory pages belong to the process
  6690                              <1> 	; which is being terminated.
  6691                              <1> 	; (Retro UNIX 386 v1 modification !)
  6692                              <1> 	;
  6693 0000E63F 53                  <1> 	push	ebx
  6694 0000E640 A1[545D0100]        <1> 	mov 	eax, [u.pgdir]  ; page directory of the process
  6695 0000E645 8B1D[585D0100]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  6696 0000E64B E86266FFFF          <1> 	call	deallocate_page_dir
  6697 0000E650 A1[505D0100]        <1> 	mov	eax, [u.upage] ; 'user' structure page of the process
  6698 0000E655 E8FD66FFFF          <1> 	call	deallocate_page
  6699 0000E65A 5B                  <1> 	pop	ebx
  6700                              <1> swap_7: 
  6701 0000E65B C0E302              <1> 	shl	bl, 2 ; * 4 
  6702 0000E65E 8B83[585A0100]      <1> 	mov	eax, [ebx+p.upage-4] ; the 'u' page of the new process
  6703 0000E664 E840000000          <1> 	call	rswap ; read new process into core
  6704                              <1> swap_8: 
  6705                              <1> 	; Retro UNIX  8086 v1 modification !
  6706 0000E669 C605[445D0100]04    <1> 	mov	byte [u.quant], time_count 
  6707 0000E670 C3                  <1> 	retn
  6708                              <1> 
  6709                              <1> wswap:  ; < swap out, swap to disk >
  6710                              <1> 	; 28/02/2017 (fnsave)
  6711                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6712                              <1> 	; 09/05/2015 (Retro UNIX 386 v1)
  6713                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6714                              <1> 	; 'wswap' writes out the process that is in core onto its 
  6715                              <1> 	; appropriate disk area.
  6716                              <1> 	;
  6717                              <1> 	; Retro UNIX 386 v1 modification ->
  6718                              <1> 	;       User (u) structure content and the user's register content
  6719                              <1> 	;	will be copied to the process's/user's UPAGE (a page for
  6720                              <1> 	;	saving 'u' structure and user registers for task switching).
  6721                              <1> 	;	u.usp - points to kernel stack address which contains
  6722                              <1> 	;		user's registers while entering system call.  
  6723                              <1> 	;	u.sp  - points to kernel stack address 
  6724                              <1> 	;		to return from system call -for IRET-.
  6725                              <1> 	;	[u.usp]+32+16 = [u.sp] 
  6726                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
  6727                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
  6728                              <1> 	;
  6729                              <1> 	; Retro UNIX 8086 v1 modification ->
  6730                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6731                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6732                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6733                              <1> 	;	compatibles was using 1MB segmented memory 
  6734                              <1> 	;	in 8086/8088 times.
  6735                              <1> 	;
  6736                              <1> 	; INPUTS ->
  6737                              <1> 	;    u.break - points to end of program
  6738                              <1> 	;    u.usp - stack pointer at the moment of swap
  6739                              <1> 	;    core - beginning of process program		
  6740                              <1> 	;    ecore - end of core 	
  6741                              <1> 	;    user - start of user parameter area		
  6742                              <1> 	;    u.uno - user process number	
  6743                              <1> 	;    p.dska - holds block number of process	
  6744                              <1> 	; OUTPUTS ->
  6745                              <1> 	;    swp I/O queue
  6746                              <1> 	;    p.break - negative word count of process 
  6747                              <1> 	;    r1 - process disk address	
  6748                              <1> 	;    r2 - negative word count
  6749                              <1> 	;
  6750                              <1> 	; RETRO UNIX 8086 v1 input/output:
  6751                              <1> 	;
  6752                              <1> 	; INPUTS ->
  6753                              <1> 	;    u.uno - process number (to be swapped out)
  6754                              <1> 	; OUTPUTS ->
  6755                              <1> 	;    none
  6756                              <1> 	;
  6757                              <1> 	;   ((Modified registers: ECX, ESI, EDI))  
  6758                              <1> 	;
  6759                              <1> 
  6760                              <1> 	; 28/02/2017
  6761                              <1> 	;cmp	byte [multi_tasking], 0  ; Musti tasking mode ?
  6762                              <1> 	;jna	short wswp
  6763 0000E671 803D[765D0100]00    <1> 	cmp	byte [u.fpsave], 0 ; 28/02/2017
  6764 0000E678 7606                <1> 	jna	short wswp
  6765 0000E67A DD35[785D0100]      <1> 	fnsave	[u.fpregs] ; save floating point registers (94 bytes)
  6766                              <1> wswp:
  6767 0000E680 8B3D[505D0100]      <1> 	mov	edi, [u.upage] ; process's user (u) structure page addr
  6768 0000E686 B938000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
  6769 0000E68B BE[F85C0100]        <1> 	mov	esi, user ; active user (u) structure	
  6770 0000E690 F3A5                <1> 	rep	movsd
  6771                              <1> 	;
  6772 0000E692 8B35[FC5C0100]      <1> 	mov	esi, [u.usp] ; esp (system stack pointer, 
  6773                              <1> 			     ;      points to user registers)
  6774 0000E698 8B0D[F85C0100]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
  6775                              <1> 			     ; (for IRET)
  6776                              <1> 			     ; [u.sp] -> EIP (user)
  6777                              <1> 			     ; [u.sp+4]-> CS (user)
  6778                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
  6779                              <1> 			     ; [u.sp+12] -> ESP (user)
  6780                              <1> 			     ; [u.sp+16] -> SS (user)	
  6781 0000E69E 29F1                <1> 	sub	ecx, esi     ; required space for user registers
  6782 0000E6A0 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
  6783                              <1> 			     ; (for IRET) 	
  6784 0000E6A3 C1E902              <1> 	shr	ecx, 2	     		
  6785 0000E6A6 F3A5                <1> 	rep	movsd
  6786 0000E6A8 C3                  <1> 	retn
  6787                              <1> 
  6788                              <1> rswap:  ; < swap in, swap from disk >
  6789                              <1> 	; 28/02/2017 (frstor)
  6790                              <1> 	; 15/01/2017
  6791                              <1> 	; 14/01/2017
  6792                              <1> 	; 21/05/2016
  6793                              <1> 	; 03/05/2016
  6794                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6795                              <1> 	; 09/05/2015 - 15/09/2015 (Retro UNIX 386 v1)
  6796                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6797                              <1> 	; 'rswap' reads a process whose number is in r1, 
  6798                              <1> 	; from disk into core.
  6799                              <1> 	;
  6800                              <1> 	; Retro UNIX 386 v1 modification ->
  6801                              <1> 	;       User (u) structure content and the user's register content
  6802                              <1> 	;	will be restored from process's/user's UPAGE (a page for
  6803                              <1> 	;	saving 'u' structure and user registers for task switching).
  6804                              <1> 	;	u.usp - points to kernel stack address which contains
  6805                              <1> 	;		user's registers while entering system call.  
  6806                              <1> 	;	u.sp  - points to kernel stack address 
  6807                              <1> 	;		to return from system call -for IRET-.
  6808                              <1> 	;	[u.usp]+32+16 = [u.sp] 
  6809                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
  6810                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
  6811                              <1> 	;
  6812                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6813                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6814                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6815                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6816                              <1> 	;	compatibles was using 1MB segmented memory 
  6817                              <1> 	;	in 8086/8088 times.
  6818                              <1> 	;
  6819                              <1> 	; INPUTS ->
  6820                              <1> 	;    r1 - process number of process to be read in
  6821                              <1> 	;    p.break - negative of word count of process 
  6822                              <1> 	;    p.dska - disk address of the process		
  6823                              <1> 	;    u.emt - determines handling of emt's 	
  6824                              <1> 	;    u.ilgins - determines handling of illegal instructions		
  6825                              <1> 	; OUTPUTS ->
  6826                              <1> 	;    8 = (u.ilgins)
  6827                              <1> 	;    24 = (u.emt)
  6828                              <1> 	;    swp - bit 10 is set to indicate read 
  6829                              <1> 	;		(bit 15=0 when reading is done)	
  6830                              <1> 	;    swp+2 - disk block address
  6831                              <1> 	;    swp+4 - negative word count 	
  6832                              <1> 	;      ((swp+6 - address of user structure)) 
  6833                              <1> 	;
  6834                              <1> 	; RETRO UNIX 8086 v1 input/output:
  6835                              <1> 	;
  6836                              <1> 	; INPUTS ->
  6837                              <1> 	;    AL	- new process number (to be swapped in)	 
  6838                              <1> 	; OUTPUTS ->
  6839                              <1> 	;    none
  6840                              <1> 	;
  6841                              <1> 	;   ((Modified registers: EAX, ECX, ESI, EDI, ESP)) 
  6842                              <1> 	;
  6843                              <1> 	; Retro UNIX 386 v1 - modification ! 14/05/2015
  6844 0000E6A9 89C6                <1> 	mov	esi, eax  ; process's user (u) structure page addr
  6845 0000E6AB B938000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
  6846 0000E6B0 BF[F85C0100]        <1> 	mov	edi, user ; active user (u) structure	
  6847 0000E6B5 F3A5                <1> 	rep	movsd
  6848 0000E6B7 58                  <1> 	pop	eax	; 'rswap' return address
  6849                              <1> 	; 
  6850                              <1> 	;cli
  6851 0000E6B8 8B3D[FC5C0100]      <1> 	mov	edi, [u.usp] ; esp (system stack pointer, 
  6852                              <1> 			     ;     points to user registers)
  6853 0000E6BE 89FC                <1> 	mov	esp, edi     ; 14/01/2017
  6854 0000E6C0 8B0D[F85C0100]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
  6855                              <1> 			     ; (for IRET)
  6856                              <1> 			     ; [u.sp] -> EIP (user)
  6857                              <1> 			     ; [u.sp+4]-> CS (user)
  6858                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
  6859                              <1> 			     ; [u.sp+12] -> ESP (user)
  6860                              <1> 			     ; [u.sp+16] -> SS (user)		
  6861 0000E6C6 29F9                <1> 	sub	ecx, edi     ; required space for user registers
  6862 0000E6C8 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
  6863                              <1> 			     ; (for IRET) 	
  6864 0000E6CB C1E902              <1> 	shr	ecx, 2	       		
  6865 0000E6CE F3A5                <1> 	rep	movsd
  6866                              <1> 	;mov	esp, [u.usp] ; 15/09/2015
  6867                              <1> 	;sti
  6868                              <1> 	; 28/02/2017
  6869                              <1> 	;cmp	byte [multi_tasking], 0  ; Musti tasking mode ?
  6870                              <1> 	;jna	short rswp_retn
  6871 0000E6D0 803D[765D0100]00    <1> 	cmp	byte [u.fpsave], 0
  6872 0000E6D7 7606                <1> 	jna	short rswp_retn
  6873 0000E6D9 DD25[785D0100]      <1> 	frstor	[u.fpregs] ; restore floating point regs (94 bytes)
  6874                              <1> rswp_retn:
  6875 0000E6DF 50                  <1> 	push	eax	; 'rswap' return address
  6876 0000E6E0 C3                  <1> 	retn
  6877                              <1> 
  6878                              <1> putlu: 
  6879                              <1> 	; 20/05/2016
  6880                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6881                              <1> 	; 10/05/2015 - 12/09/2015 (Retro UNIX 386 v1)
  6882                              <1> 	; 15/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
  6883                              <1> 	; 'putlu' is called with a process number in r1 and a pointer
  6884                              <1> 	; to lowest priority Q (runq+4) in r2. A link is created from
  6885                              <1> 	; the last process on the queue to process in r1 by putting
  6886                              <1> 	; the process number in r1 into the last process's link.
  6887                              <1> 	;
  6888                              <1> 	; INPUTS ->
  6889                              <1> 	;    r1 - user process number
  6890                              <1> 	;    r2 - points to lowest priority queue 
  6891                              <1> 	;    p.dska - disk address of the process		
  6892                              <1> 	;    u.emt - determines handling of emt's 	
  6893                              <1> 	;    u.ilgins - determines handling of illegal instructions		
  6894                              <1> 	; OUTPUTS ->
  6895                              <1> 	;    r3 - process number of last process on the queue upon
  6896                              <1> 	;	  entering putlu
  6897                              <1> 	;    p.link-1 + r3 - process number in r1
  6898                              <1> 	;    r2 - points to lowest priority queue
  6899                              <1> 	;
  6900                              <1> 	; ((Modified registers: EDX, EBX)) 
  6901                              <1> 	;
  6902                              <1> 	; / r1 = user process no.; r2 points to lowest priority queue
  6903                              <1> 
  6904                              <1> 	; EBX = r2
  6905                              <1> 	; EAX = r1 (AL=r1b)
  6906                              <1> 
  6907                              <1> 	; 20/05/2016
  6908                              <1> 	; AL = process number (1 to 16) // Retro UNIX 8086, 386 v1 // 
  6909                              <1> 	;     (max. 16 processes available for current kernel version) 
  6910                              <1> 	; EBX = run queue address ; 20/05/2016 (TRDOS 386)
  6911                              <1> 		; which is one of following addresses:
  6912                              <1> 		;  1) 'runq_event' high priority run queue	 	
  6913                              <1> 		;  2) 'runq_normal' normal/regular priority run queue
  6914                              <1> 		;  3) 'runq_background' low priority run queue
  6915                              <1> 
  6916                              <1> 	;mov	ebx, runq
  6917 0000E6E1 0FB613              <1> 	movzx  	edx, byte [ebx]
  6918 0000E6E4 43                  <1> 	inc	ebx
  6919 0000E6E5 20D2                <1> 	and	dl, dl
  6920                              <1> 		; tstb (r2)+ / is queue empty?
  6921 0000E6E7 740A                <1>        	jz	short putlu_1
  6922                              <1> 		; beq 1f / yes, branch
  6923 0000E6E9 8A13                <1> 	mov 	dl, [ebx] ; 12/09/2015
  6924                              <1> 		; movb (r2),r3 / no, save the "last user" process number
  6925                              <1> 			     ; / in r3
  6926 0000E6EB 8882[3B5A0100]      <1>        	mov	[edx+p.link-1], al
  6927                              <1> 		; movb r1,p.link-1(r3) / put pointer to user on 
  6928                              <1> 			     ; / "last users" link
  6929 0000E6F1 EB03                <1> 	jmp	short putlu_2
  6930                              <1> 		; br 2f /
  6931                              <1> putlu_1: ; 1:
  6932 0000E6F3 8843FF              <1> 	mov	[ebx-1], al
  6933                              <1>        		; movb r1,-1(r2) / user is only user; 
  6934                              <1> 			    ; / put process no. at beginning and at end
  6935                              <1> putlu_2: ; 2: 
  6936 0000E6F6 8803                <1> 	mov	[ebx], al
  6937                              <1>        		; movb r1,(r2) / user process in r1 is now the last entry
  6938                              <1> 			     ; / on the queue
  6939 0000E6F8 88C2                <1> 	mov	dl, al
  6940 0000E6FA 88B2[3B5A0100]      <1>         mov     [edx+p.link-1], dh ; 0
  6941                              <1> 		; dec r2 / restore r2
  6942 0000E700 C3                  <1>         retn
  6943                              <1> 		; rts r0
  6944                              <1> sysver:
  6945                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6946 0000E701 C705[005D0100]0002- <1> 	mov	dword [u.r0], 200h ; AH = major version, AL = minor version 
  6946 0000E709 0000                <1>
  6947 0000E70B E9FFDCFFFF          <1> 	jmp	sysret
  6948                              <1> 
  6949                              <1> sysreserved1:
  6950                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  6951                              <1> 	; // name and content will be changed later //
  6952 0000E710 C705[005D0100]E007- <1> 	mov	dword [u.r0], 2016
  6952 0000E718 0000                <1>
  6953 0000E71A E9F0DCFFFF          <1> 	jmp	sysret
  6954                              <1> 
  6955                              <1> syspri: ; change running priority (of the process)
  6956                              <1> 	; 21/05/2016
  6957                              <1> 	; 20/05/2026 - TRDOS 386 (TRDOS v2.0)
  6958                              <1> 	; INPUT ->
  6959                              <1> 	;	BL = priority level
  6960                              <1> 	;	   0 = low running priority (running on background)
  6961                              <1> 	;	   1 = normal/regular priority (running as regular)
  6962                              <1> 	;	   2 = high/event priority (running for event)
  6963                              <1> 	;	   >2 = invalid, it will accepted as 2 (event)
  6964                              <1> 	;	   0FFh = get/return current running priority only	
  6965                              <1> 	; OUTPUT -> 	
  6966                              <1> 	;	* if current [u.pri] < 2
  6967                              <1> 	;	  if BL input < 0FFh ->
  6968                              <1> 	;	     [u.pri] is updated as in BL input (0,1,2)
  6969                              <1> 	;	  if BL input = 0FFh -> AL = [u.pri] (current)
  6970                              <1> 	;	      
  6971                              <1> 	;	* if current [u.pri] = 2
  6972                              <1> 	;	  if BL input < 0FFh -> cf = 1 & AL = 2
  6973                              <1> 	;	  if BL input = 0FFh -> cf = 0 & AL = 2  
  6974                              <1> 	;	
  6975                              <1> 	;	NOTE: 	
  6976                              <1> 	;	If [u.pri] = 2, it can not be changed to 1 or 0;
  6977                              <1> 	;	because, run queue of the running process is unspecified
  6978                              <1> 	;	at this	stage. Process might be started by a timer event
  6979                              <1> 	;	or priority might be changed to high by previous
  6980                              <1> 	;	'syspri' system	call. In both cases, the process is in
  6981                              <1> 	;	'runq_normal' or 'runq_background' queue.
  6982                              <1> 	;	As result of this fact, when the [u.quant] time quantum
  6983                              <1> 	;	of the process is elapsed or 'sysrele' system call is
  6984                              <1> 	;	instructed by the process, 'tswap' ('tswitch') procedure
  6985                              <1> 	;	will be called (to 'swap' or 'switch' out the procedure)
  6986                              <1> 	;	and it will not call 'putlu' to add the (stopping)
  6987                              <1> 	;	process to relevant run queue when [u.pri] = 2.
  6988                              <1> 	;	(Otherwise, it would be possible to add process to
  6989                              <1> 	;	a run queue while it is already in a run queue, wrongly.)
  6990                              <1>   	;
  6991                              <1> 	;	If [u.pri]< 2, 'tswap/tswitch' procedure will call 
  6992                              <1> 	;	'putlu' to add process to relevant run queue
  6993                              <1> 	;	according to [u.pri] value. ('runq_normal' for 1, 
  6994                              <1> 	;	'runq_background' for 0).
  6995                              <1> 	;
  6996                              <1> 	;	If BL input >= 2 and < 0FFh while [u.pri] < 2,
  6997                              <1> 	;	process will be added to 'runq_normal' queue and
  6998                              <1> 	;	[u.pri] will be set to 2. (in 'syspri' system call)
  6999                              <1> 	;
  7000                              <1> 
  7001 0000E71F 29C0                <1> 	sub	eax, eax ; 0
  7002 0000E721 A3[645D0100]        <1> 	mov	[u.error], eax
  7003                              <1> 
  7004 0000E726 A0[455D0100]        <1> 	mov	al, [u.pri]
  7005 0000E72B A3[005D0100]        <1> 	mov	[u.r0], eax
  7006                              <1> 
  7007 0000E730 FEC3                <1> 	inc	bl
  7008 0000E732 0F84D7DCFFFF        <1> 	jz	sysret ; 0FFh -> 0, get priority level
  7009                              <1> 	
  7010 0000E738 3C02                <1> 	cmp	al, 2
  7011 0000E73A 0F83AFDCFFFF        <1> 	jnb	error ; CF = 1 & AL = 2 (& last error = 0)
  7012                              <1> 
  7013 0000E740 FECB                <1> 	dec	bl
  7014 0000E742 80FB02              <1> 	cmp	bl, 2
  7015 0000E745 7602                <1> 	jna	short syspri_1
  7016 0000E747 B302                <1> 	mov	bl, 2
  7017                              <1> syspri_1:
  7018 0000E749 881D[455D0100]      <1> 	mov	[u.pri], bl
  7019 0000E74F 80FB02              <1> 	cmp	bl, 2
  7020 0000E752 0F82B7DCFFFF        <1>         jb      sysret
  7021                              <1> 
  7022                              <1> 	; here...
  7023                              <1> 	; Priority of current process has been changed to high
  7024                              <1> 	; ('run for event') but current process will be added to
  7025                              <1> 	; 'run as normal' queue. ('run for event' high priority
  7026                              <1> 	; queue is under control of timer -& RTC- interrupt only!) 
  7027                              <1> 	;
  7028                              <1> 	; (Otherwise, process can fall into black hole!
  7029                              <1> 	; e.g. if it is not in waiting list and it has not got 
  7030                              <1> 	; a timer event and it is not in a run queue!
  7031                              <1> 	; Because, when [u.pri] is 2, 'tswap/tswitch' will not 
  7032                              <1> 	; add the stopping process to a run queue.)
  7033                              <1> 
  7034 0000E758 A0[4F5D0100]        <1> 	mov	al, [u.uno]
  7035 0000E75D BB[F05C0100]        <1> 	mov	ebx, runq_normal ; normal priority !
  7036                              <1> 				 ; [u.pri] is set to high
  7037                              <1> 				 ; but 'runq_event' queue is set
  7038                              <1> 				 ; only by the kernel's timer
  7039                              <1> 				 ; event function (timer interrupt). 
  7040 0000E762 E87AFFFFFF          <1> 	call	putlu
  7041 0000E767 E9A3DCFFFF          <1> 	jmp	sysret
  7042                              <1> 
  7043                              <1> cpass: ; / get next character from user area of core and put it in AL (r1)
  7044                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
  7045                              <1> 	; 19/05/2015 - 18/10/2015 (Retro UNIX 386 v1)
  7046                              <1> 	; 14/08/2013 - 20/09/2013 (Retro UNIX 8086 v1)
  7047                              <1> 	; INPUTS -> 
  7048                              <1> 	;     [u.base] = virtual address in user area
  7049                              <1> 	;     [u.count] = byte count (max.)
  7050                              <1> 	;     [u.pcount] = byte count in page (0 = reset)		
  7051                              <1> 	; OUTPUTS -> 
  7052                              <1> 	;     AL = the character which is pointed by [u.base]
  7053                              <1> 	;     zf = 1 -> transfer count has been completed	
  7054                              <1>         ;
  7055                              <1> 	; ((Modified registers:  EAX, EDX, ECX))
  7056                              <1> 	;
  7057 0000E76C 833D[245D0100]00    <1> 	cmp 	dword [u.count], 0  ; have all the characters been transferred
  7058                              <1> 			    	    ; i.e., u.count, # of chars. left
  7059 0000E773 763F                <1> 	jna	short cpass_3	    ; to be transferred = 0?) yes, branch
  7060 0000E775 FF0D[245D0100]      <1> 	dec	dword [u.count]	    ; no, decrement u.count
  7061                              <1>         ; 19/05/2015 
  7062                              <1> 	;(Retro UNIX 386 v1 - translation from user's virtual address
  7063                              <1> 	;		      to physical address
  7064 0000E77B 66833D[605D0100]00  <1> 	cmp	word [u.pcount], 0 ; byte count in page = 0 (initial value)
  7065                              <1> 			     ; 1-4095 --> use previous physical base address
  7066                              <1> 			     ; in [u.pbase]
  7067 0000E783 770E                <1> 	ja	short cpass_1
  7068 0000E785 833D[585D0100]00    <1> 	cmp     dword [u.ppgdir], 0  ; is the caller os kernel
  7069 0000E78C 7427                <1>         je      short cpass_k       ; (sysexec, '/etc/init') ?  (MainProg)
  7070 0000E78E E849FDFFFF          <1> 	call	trans_addr_r
  7071                              <1> cpass_1:
  7072 0000E793 66FF0D[605D0100]    <1> 	dec	word [u.pcount]
  7073                              <1> cpass_2: 
  7074 0000E79A 8B15[5C5D0100]      <1> 	mov	edx, [u.pbase]
  7075 0000E7A0 8A02                <1> 	mov	al, [edx]	; take the character pointed to 
  7076                              <1> 				; by u.base and put it in r1
  7077 0000E7A2 FF05[285D0100]      <1> 	inc	dword [u.nread] ; increment no. of bytes transferred
  7078 0000E7A8 FF05[205D0100]      <1> 	inc	dword [u.base]  ; increment the buffer address to point to the
  7079                              <1> 			        ; next byte
  7080 0000E7AE FF05[5C5D0100]      <1> 	inc	dword [u.pbase]
  7081                              <1> cpass_3:
  7082 0000E7B4 C3                  <1> 	retn
  7083                              <1> cpass_k:
  7084                              <1> 	; 02/07/2015
  7085                              <1> 	; The caller is os kernel 
  7086                              <1> 	; (get sysexec arguments from kernel's memory space)
  7087 0000E7B5 8B1D[205D0100]      <1> 	mov	ebx, [u.base]
  7088 0000E7BB 66C705[605D0100]00- <1>         mov     word [u.pcount], PAGE_SIZE ; 4096
  7088 0000E7C3 10                  <1>
  7089 0000E7C4 891D[5C5D0100]      <1> 	mov	[u.pbase], ebx
  7090 0000E7CA EBCE                <1> 	jmp	short cpass_2
  7091                              <1> 
  7092                              <1> transfer_to_user_buffer: ; fast transfer
  7093                              <1> 	; 27/05/2016
  7094                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  7095                              <1> 	;
  7096                              <1> 	; INPUT ->
  7097                              <1> 	;	ESI = source address in system space
  7098                              <1> 	;	EDI = user's buffer address
  7099                              <1> 	;	ECX = transfer (byte) count
  7100                              <1> 	;	[u.pgdir] = user's page directory
  7101                              <1> 	; OUTPUT ->
  7102                              <1> 	;	ECX = actual transfer count
  7103                              <1> 	;	cf = 1 -> error
  7104                              <1> 	;	[u.count] = remain byte count
  7105                              <1> 	;
  7106                              <1> 	; Modified registers: eax, ecx
  7107                              <1> 	;
  7108                              <1> 
  7109 0000E7CC 21C9                <1> 	and	ecx, ecx
  7110 0000E7CE 743B                <1> 	jz	short ttub_4
  7111                              <1> 
  7112 0000E7D0 890D[245D0100]      <1> 	mov	[u.count], ecx
  7113                              <1> 	
  7114 0000E7D6 57                  <1> 	push	edi
  7115 0000E7D7 56                  <1> 	push	esi
  7116 0000E7D8 53                  <1> 	push	ebx
  7117 0000E7D9 52                  <1> 	push	edx
  7118 0000E7DA 51                  <1> 	push	ecx
  7119                              <1> 
  7120 0000E7DB 89FB                <1> 	mov	ebx, edi
  7121 0000E7DD 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
  7122                              <1> ttub_1:
  7123                              <1> 	; ebx = virtual (linear) address
  7124                              <1> 	; [u.pgdir] = user's page directory
  7125 0000E7E3 E8AC6AFFFF          <1>        	call	get_physical_addr_x ; get physical address
  7126 0000E7E8 7222                <1> 	jc	short ttub_5
  7127                              <1> 	; eax = physical address 
  7128                              <1> 	; ecx = remain byte count in page (1-4096)
  7129 0000E7EA 89C7                <1> 	mov	edi, eax
  7130 0000E7EC A1[245D0100]        <1> 	mov	eax, [u.count]
  7131 0000E7F1 39C1                <1> 	cmp	ecx, eax
  7132 0000E7F3 7602                <1> 	jna	short ttub_2
  7133 0000E7F5 89C1                <1> 	mov	ecx, eax
  7134                              <1> ttub_2:	
  7135 0000E7F7 29C8                <1> 	sub	eax, ecx
  7136 0000E7F9 01CB                <1> 	add	ebx, ecx
  7137 0000E7FB F3A4                <1> 	rep	movsb
  7138 0000E7FD A3[245D0100]        <1> 	mov	[u.count], eax
  7139 0000E802 09C0                <1> 	or	eax, eax
  7140 0000E804 75DD                <1> 	jnz	short ttub_1
  7141                              <1> ttub_retn:
  7142                              <1> tfub_retn:
  7143 0000E806 59                  <1> 	pop	ecx ; transfer count = actual transfer count
  7144                              <1> ttub_3:
  7145 0000E807 5A                  <1> 	pop	edx
  7146 0000E808 5B                  <1> 	pop	ebx
  7147 0000E809 5E                  <1> 	pop	esi
  7148 0000E80A 5F                  <1> 	pop	edi
  7149                              <1> ttub_4:
  7150 0000E80B C3                  <1> 	retn
  7151                              <1> ttub_5:
  7152 0000E80C 59                  <1> 	pop	ecx
  7153 0000E80D 2B0D[245D0100]      <1> 	sub	ecx, [u.count] ; actual transfer count
  7154 0000E813 F9                  <1> 	stc
  7155 0000E814 EBF1                <1> 	jmp	short ttub_3
  7156                              <1> 
  7157                              <1> transfer_from_user_buffer: ; fast transfer
  7158                              <1> 	; 27/05/2016
  7159                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  7160                              <1> 	;
  7161                              <1> 	; INPUT ->
  7162                              <1> 	;	ESI = user's buffer address
  7163                              <1> 	;	EDI = destination address in system space
  7164                              <1> 	;	ECX = transfer (byte) count
  7165                              <1> 	;	[u.pgdir] = user's page directory
  7166                              <1> 	; OUTPUT ->
  7167                              <1> 	;	ecx = actual transfer count
  7168                              <1> 	;	cf = 1 -> error
  7169                              <1> 	;	[u.count] = remain byte count
  7170                              <1> 	;
  7171                              <1> 	; Modified registers: eax, ecx
  7172                              <1> 	;
  7173                              <1> 
  7174 0000E816 21C9                <1> 	and	ecx, ecx
  7175                              <1> 	;jz	short tfub_4
  7176 0000E818 74F1                <1> 	jz	short ttub_4
  7177                              <1> 
  7178 0000E81A 890D[245D0100]      <1> 	mov	[u.count], ecx
  7179                              <1> 	
  7180 0000E820 57                  <1> 	push	edi
  7181 0000E821 56                  <1> 	push	esi
  7182 0000E822 53                  <1> 	push	ebx
  7183 0000E823 52                  <1> 	push	edx
  7184 0000E824 51                  <1> 	push	ecx
  7185                              <1> 
  7186 0000E825 89F3                <1> 	mov	ebx, esi
  7187 0000E827 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
  7188                              <1> tfub_1:
  7189                              <1> 	; ebx = virtual (linear) address
  7190                              <1> 	; [u.pgdir] = user's page directory
  7191 0000E82D E8626AFFFF          <1>        	call	get_physical_addr_x ; get physical address
  7192                              <1> 	;jc	short tfub_5
  7193 0000E832 72D8                <1> 	jc	short ttub_5
  7194                              <1> 	; eax = physical address 
  7195                              <1> 	; ecx = remain byte count in page (1-4096)
  7196 0000E834 89C6                <1> 	mov	esi, eax
  7197 0000E836 A1[245D0100]        <1> 	mov	eax, [u.count]
  7198 0000E83B 39C1                <1> 	cmp	ecx, eax
  7199 0000E83D 7602                <1> 	jna	short tfub_2
  7200 0000E83F 89C1                <1> 	mov	ecx, eax
  7201                              <1> tfub_2:	
  7202 0000E841 29C8                <1> 	sub	eax, ecx
  7203 0000E843 01CB                <1> 	add	ebx, ecx
  7204 0000E845 F3A4                <1> 	rep	movsb
  7205 0000E847 A3[245D0100]        <1> 	mov	[u.count], eax
  7206 0000E84C 09C0                <1> 	or	eax, eax
  7207 0000E84E 75DD                <1> 	jnz	short tfub_1
  7208                              <1> 
  7209 0000E850 EBB4                <1> 	jmp	short tfub_retn
  7210                              <1> 
  7211                              <1> ;tfub_retn:
  7212                              <1> ;	pop	ecx ; transfer count = actual transfer count
  7213                              <1> ;tfub_3:
  7214                              <1> ;	pop	edx
  7215                              <1> ;	pop	ebx
  7216                              <1> ;	pop	esi
  7217                              <1> ;	pop	edi
  7218                              <1> ;tfub_4:
  7219                              <1> ;	retn
  7220                              <1> ;tfub_5:
  7221                              <1> ;	pop	ecx
  7222                              <1> ;	sub	ecx, [u.count] ; actual transfer count
  7223                              <1> ;	stc
  7224                              <1> ;	jmp	short tfub_3
  7225                              <1> 
  7226                              <1> sysfff: ; <Find First File>
  7227                              <1> 	; 17/10/2016
  7228                              <1> 	; 16/10/2016
  7229                              <1> 	; 15/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
  7230                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
  7231                              <1> 	;            ("loc_INT21h_find_first_file")
  7232                              <1> 	; TRDOS 8086 (v1.0)
  7233                              <1>         ; 	07/08/2011 
  7234                              <1>         ;	Find First File
  7235                              <1> 	;	INPUT:
  7236                              <1>         ;	    CX= Attributes
  7237                              <1>         ;	    DS:DX= Pointer to filename
  7238                              <1> 	;	MSDOS OUTPUT:
  7239                              <1> 	;	    DTA: (Default address: PSP offset 80h)
  7240                              <1> 	;	    Offset  Descrription
  7241                              <1> 	;	    0	    Reserved for use find next file
  7242                              <1> 	;	    21	    Attribute of file found
  7243                              <1> 	;	    22	    Time stamp of file
  7244                              <1> 	;	    24	    Date stamp of file
  7245                              <1> 	;	    26	    File size in bytes
  7246                              <1> 	;	    30	    Filename and extension (zero terminated)
  7247                              <1> 	;	If cf = 1:
  7248                              <1> 	;	    Error Codes: (in AX)
  7249                              <1> 	;	    	2 - File not found
  7250                              <1> 	;	       18 - No more files  			
  7251                              <1>         ;
  7252                              <1> 	; TRDOS 386 (v2.0) 
  7253                              <1> 	; 15/10/2016
  7254                              <1> 	;	
  7255                              <1>         ; INPUT ->
  7256                              <1>         ;	   CL = File attributes
  7257                              <1> 	;     	      bit 0 (1) - Read only file (R)
  7258                              <1> 	;             bit 1 (1) - Hidden file (H)
  7259                              <1>         ;             bit 2 (1) - System file (R)
  7260                              <1> 	;             bit 3 (1) - Volume label/name (V)
  7261                              <1>         ;             bit 4 (1) - Subdirectory (D)
  7262                              <1> 	;	      bit 5 (1) - File has been archived (A)
  7263                              <1> 	;	   CH = 0 -> Return basic parameters (24 bytes)
  7264                              <1> 	;	   CH > 0 -> Return FindFile structure/table (128 bytes)
  7265                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
  7266                              <1> 	;	   EDX = File parameters buffer address
  7267                              <1> 	;		(buffer size = 24 bytes if CH input = 0)
  7268                              <1> 	;		(buffer size = 128 bytes if CH input > 0)
  7269                              <1> 	;		 
  7270                              <1> 	; OUTPUT ->
  7271                              <1> 	;	   EAX = 0 if CH input > 0
  7272                              <1> 	;	   EAX = First cluster number of file if CH input = 0	
  7273                              <1> 	;	   EDX = File parameters table/structure address
  7274                              <1> 	;	   Basic Parameters:
  7275                              <1> 	;		Offset  Description
  7276                              <1> 	;		------	---------------
  7277                              <1> 	;		0	File Attributes
  7278                              <1> 	;		1	Ambiguous filename chars are used sign
  7279                              <1> 	;			(0 = filename fits exactly with request)
  7280                              <1> 	;			(>0 = ambiguous filename chars are used)
  7281                              <1> 	;	      	2	Time stamp of file
  7282                              <1> 	;		4	Date stamp of file
  7283                              <1> 	;		6	File size in bytes
  7284                              <1> 	;		10	Short Filename (ASCIIZ, max. 13 bytes)
  7285                              <1> 	;		23	Longname Length (1-255) if existing 
  7286                              <1> 	;  
  7287                              <1> 	;          cf = 1 -> Error code in AL
  7288                              <1> 	;
  7289                              <1> 	; Modified Registers: EAX (at the return of system call)
  7290                              <1> 	;  
  7291                              <1> 	; TR-DOS FindFile (FFF) Structure (128 bytes):
  7292                              <1> 	; 09/10/2011 (DIR.ASM) - 10/02/2016 (trdoskx.s)
  7293                              <1> 	;	
  7294                              <1> 	; Offset	Parameter		Size
  7295                              <1> 	; ------	------------------	-------- 
  7296                              <1> 	; 0		FindFile_Drv		1 byte
  7297                              <1> 	; 1		FindFile_Directory	65 bytes
  7298                              <1> 	; 66		FindFile_Name		13 bytes
  7299                              <1> 	; 79		FindFile_LongNameEntryLength 1 byte
  7300                              <1> 	;Above 80 bytes form
  7301                              <1> 	;TR-DOS Source/Destination File FullName Format/Structure
  7302                              <1> 	; 80		FindFile_AttributesMask 1 word
  7303                              <1> 	; 82		FindFile_DirEntry	32 bytes (*)
  7304                              <1> 	; 114		FindFile_DirFirstCluster 1 double word
  7305                              <1> 	; 118		FindFile_DirCluster	1 double word
  7306                              <1> 	; 122		FindFile_DirEntryNumber 1 word
  7307                              <1> 	; 124		FindFile_MatchCounter	1 word
  7308                              <1> 	; 126		FindFile_Reserved	1 word
  7309                              <1>    	; (*) MS-DOS, FAT 12-16-32 classic directory entry (32 bytes)
  7310                              <1> 
  7311                              <1> 	;mov	[u.namep], ebx
  7312                              <1> 	; 16/10/2016
  7313 0000E852 8915[944F0100]      <1> 	mov	[FFF_UBuffer], edx
  7314 0000E858 66890D[994F0100]    <1> 	mov	[FFF_Attrib], cx ; [FFF_RType] = ch
  7315                              <1> 		    ; Attributes in CL, return data type in CH
  7316 0000E85F 89DE                <1> 	mov	esi, ebx
  7317                              <1> 	; file name is forced, change directory as temporary
  7318                              <1> 	;mov	ax, 1
  7319                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  7320                              <1> 	;call	set_working_path 
  7321 0000E861 E8880C0000          <1> 	call	set_working_path_x ; 17/10/2016	
  7322 0000E866 731D                <1> 	jnc	short sysfff_0
  7323                              <1>  
  7324 0000E868 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  7325 0000E86A 7505                <1> 	jnz	short sysfff_err
  7326                              <1> 
  7327                              <1> 	; eax = 0
  7328 0000E86C B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  7329                              <1> sysfff_err:
  7330 0000E871 A3[005D0100]        <1> 	mov	[u.r0], eax
  7331 0000E876 A3[645D0100]        <1> 	mov	[u.error], eax
  7332 0000E87B E8430D0000          <1>         call 	reset_working_path
  7333 0000E880 E96ADBFFFF          <1> 	jmp	error
  7334                              <1> 
  7335                              <1> sysfff_0:
  7336                              <1> 	;sub	ah, ah ; ah = 0
  7337 0000E885 8A0424              <1> 	mov	al, [esp]
  7338 0000E888 08C0                <1> 	or	al, al
  7339 0000E88A 7412                <1> 	jz	short sysfff_2
  7340 0000E88C B410                <1> 	mov	ah, 10h
  7341 0000E88E A808                <1> 	test	al, 08h
  7342 0000E890 7503                <1> 	jnz	short sysfff_1
  7343 0000E892 80CC08              <1> 	or	ah, 08h
  7344                              <1> sysfff_1:
  7345 0000E895 2410                <1> 	and	al, 10h ; Directory
  7346 0000E897 7405                <1> 	jz	short sysfff_2
  7347 0000E899 80E408              <1> 	and	ah, 08h
  7348 0000E89C 30C0                <1> 	xor	al, al ; When a directory is searched,
  7349                              <1> 		       ; filename will be returned even if
  7350                              <1> 		       ; it is not a directory!
  7351                              <1> 		       ; Because: (in order to prevent
  7352                              <1> 		       ; creating a dir with existing file name)
  7353                              <1> 		       ; Dir and file names must not be same!
  7354                              <1> 		       ; (return attribute must be checked)  	  	 	
  7355                              <1> sysfff_2:
  7356                              <1> 	; AX = Attributes mask 
  7357                              <1> 		; AL = AND mask (result must be equal to AL)
  7358                              <1> 		; AH = Negative AND mask (result must be ZERO)			
  7359                              <1>  	; ESI = FindFile_Name address
  7360                              <1> 
  7361 0000E89E E8AC96FFFF          <1> 	call	find_first_file
  7362 0000E8A3 72CC                <1> 	jc	short sysfff_err ; eax = 2 (File not found !)
  7363                              <1> 
  7364                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  7365                              <1> 	; EDI = Directory Buffer Directory Entry Location
  7366                              <1> 	; EAX = File Size
  7367                              <1> 	;  BL = Attributes of The File/Directory
  7368                              <1> 	;  BH = Long Name Yes/No Status (>0 is YES)
  7369                              <1> 	;  DX > 0 : Ambiguous filename chars are used
  7370                              <1> 
  7371                              <1> sysfff_3:
  7372                              <1> 	; 16/10/2016
  7373 0000E8A5 668B0D[994F0100]    <1> 	mov	cx, [FFF_Attrib]
  7374                              <1> 	; Attribs in CL, return data type in CH
  7375                              <1> 
  7376                              <1> 	;or	cl, cl
  7377                              <1> 	;jz	short sysfff_4 ; 0 = No filter
  7378 0000E8AC 80F1FF              <1> 	xor	cl, 0FFh
  7379 0000E8AF 20D9                <1> 	and	cl, bl
  7380 0000E8B1 7409                <1> 	jz	short sysfff_4
  7381                              <1> 
  7382                              <1> 	;mov	eax, 2 ; 'file not found !' error
  7383                              <1> 	;jmp	short sysfff_err_1
  7384                              <1> 
  7385                              <1> 	; 16/10/2016
  7386 0000E8B3 E84697FFFF          <1> 	call	find_next_file
  7387 0000E8B8 72B7                <1> 	jc	short sysfff_err ; eax = 12 (no more files !)
  7388 0000E8BA EBE9                <1> 	jmp	short sysfff_3
  7389                              <1> 
  7390                              <1> sysfff_4:
  7391 0000E8BC 20ED                <1> 	and	ch, ch ; [FFF_RType]
  7392 0000E8BE 7412                <1> 	jz	short sysfff_5
  7393 0000E8C0 B980000000          <1> 	mov	ecx, 128 ; ; transfer length
  7394 0000E8C5 880D[984F0100]      <1> 	mov	[FFF_Valid], cl
  7395                              <1> sysfnf_11:
  7396 0000E8CB BE[4A4C0100]        <1> 	mov	esi, FindFile_Drv
  7397 0000E8D0 EB44                <1> 	jmp	short sysfff_6	
  7398                              <1> sysfff_5:
  7399                              <1> 	;mov	esi, FindFile_DirEntry
  7400 0000E8D2 B918000000          <1> 	mov	ecx, 24  ; transfer length
  7401 0000E8D7 880D[984F0100]      <1> 	mov	[FFF_Valid], cl
  7402                              <1> sysfnf_12:
  7403 0000E8DD BF[54540100]        <1> 	mov	edi, DTA ; FFF data transfer address
  7404                              <1> 	;mov	al, [esi+DirEntry_Attr] ; 11
  7405 0000E8E2 88D8                <1> 	mov	al, bl ; File/Dir Attributes
  7406 0000E8E4 887F17              <1> 	mov	[edi+23], bh ; Longname length (0= none)
  7407 0000E8E7 AA                  <1> 	stosb
  7408 0000E8E8 88D0                <1> 	mov	al, dl ; DL is for '?'
  7409 0000E8EA 00F0                <1> 	add	al, dh ; DH is for '*'
  7410                              <1> 	; AL > 0 if ambiguous file name wildcards are used
  7411 0000E8EC AA                  <1> 	stosb
  7412 0000E8ED 8B4616              <1> 	mov	eax, [esi+DirEntry_WrtTime] ; 22	
  7413 0000E8F0 AB                  <1>         stosd	; DirEntry_WrtTime & DirEntry_WrtDate
  7414 0000E8F1 8B461C              <1>         mov	eax, [esi+DirEntry_FileSize] ; 28
  7415 0000E8F4 AB                  <1>         stosd
  7416 0000E8F5 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
  7417 0000E8F9 66C1E010            <1> 	shl	ax, 16
  7418 0000E8FD 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
  7419 0000E901 A3[005D0100]        <1> 	mov	[u.r0], eax ; First Cluster
  7420                              <1> 
  7421                              <1>         ;mov	esi, FindFile_DirEntry
  7422 0000E906 E8F50C0000          <1> 	call	get_file_name
  7423                              <1> 
  7424 0000E90B 8A0D[984F0100]      <1> 	mov	cl, [FFF_Valid]
  7425 0000E911 BE[54540100]        <1>        	mov	esi, DTA ; FFF data transfer address
  7426                              <1> sysfff_6:
  7427 0000E916 8B3D[944F0100]      <1> 	mov	edi, [FFF_UBuffer] ; user's buffer address (edx)
  7428 0000E91C E8ABFEFFFF          <1> 	call	transfer_to_user_buffer
  7429                              <1> 
  7430 0000E921 890D[005D0100]      <1> 	mov	[u.r0], ecx ; actual transfer count
  7431 0000E927 E8970C0000          <1>         call 	reset_working_path
  7432 0000E92C E9DEDAFFFF          <1> 	jmp	sysret
  7433                              <1> 
  7434                              <1> sysfnf: ; <Find Next File>
  7435                              <1> 	; 16/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
  7436                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
  7437                              <1> 	;            ("loc_INT21h_find_next_file")
  7438                              <1> 	; TRDOS 8086 (v1.0)
  7439                              <1>         ; 	07/08/2011 
  7440                              <1>         ;	Find First File
  7441                              <1> 	;	INPUT:
  7442                              <1>         ;	    none
  7443                              <1> 	;	MSDOS OUTPUT:
  7444                              <1> 	;	    DTA: (Default address: PSP offset 80h)
  7445                              <1> 	;	    Offset  Descrription
  7446                              <1> 	;	    0	    Reserved for use find next file
  7447                              <1> 	;	    21	    Attribute of file found
  7448                              <1> 	;	    22	    Time stamp of file
  7449                              <1> 	;	    24	    Date stamp of file
  7450                              <1> 	;	    26	    File size in bytes
  7451                              <1> 	;	    30	    Filename and extension (zero terminated)
  7452                              <1> 	;	If cf = 1:
  7453                              <1> 	;	    Error Codes: (in AX)
  7454                              <1> 	;	       18 - No more files  			
  7455                              <1>         ;
  7456                              <1> 	; TRDOS 386 (v2.0) 
  7457                              <1> 	; 16/10/2016
  7458                              <1> 	;	
  7459                              <1>         ; INPUT ->
  7460                              <1>        	; 	   none
  7461                              <1> 	; OUTPUT ->
  7462                              <1> 	;	   EAX = 0 if CH input of 'Find First File' > 0
  7463                              <1> 	;	   EAX = First cluster number of file
  7464                              <1> 	;		 if CH input of 'Find First File' = 0	
  7465                              <1> 	;	   EDX = File parameters table/structure address
  7466                              <1> 	;
  7467                              <1> 	;          cf = 1 -> Error code in AL
  7468                              <1> 	;
  7469                              <1>  	; Modified Registers: EAX (at the return of system call)	
  7470                              <1> 
  7471                              <1> 	;	
  7472                              <1> 	; Note: If byte [FFF_Valid] = 0
  7473                              <1> 	;	'sysfnf' will return with 'no more files' error.
  7474                              <1> 	;	If byte [FFF_Valid] = 24
  7475                              <1> 	;	'sysfnf' will return with 32 bytes basic parameters
  7476                              <1> 	;	at the address which is in EDX.
  7477                              <1> 	;	If byte [FFF_Valid] = 128
  7478                              <1> 	;	'sysfnf' will return with 128 bytes Find File 
  7479                              <1> 	;	Structure/Table at the address which is in EDX.
  7480                              <1> 	
  7481 0000E931 803D[984F0100]00    <1> 	cmp	byte [FFF_Valid], 0
  7482 0000E938 7714                <1> 	ja	short stsfnf_0
  7483                              <1>  	; 'no more files !' error 
  7484 0000E93A B80C000000          <1> 	mov	eax, ERR_NO_MORE_FILES ; 12
  7485 0000E93F A3[005D0100]        <1> 	mov	[u.r0], eax
  7486 0000E944 A3[645D0100]        <1> 	mov	[u.error], eax
  7487 0000E949 E9A1DAFFFF          <1> 	jmp	error
  7488                              <1> stsfnf_0:
  7489                              <1> 	;cmp	byte [FFF_Valid], 128
  7490                              <1> 	;je	short stsfnf_1
  7491                              <1> 	;cmp	byte [FFF_Valid], 24
  7492                              <1> 	;je	short stsfnf_1
  7493                              <1> 	;mov	[FFF_Valid], 24 ; Default
  7494                              <1> stsfnf_1:
  7495 0000E94E 0FB61D[A6420100]    <1> 	movzx	ebx, byte [Current_Drv]
  7496 0000E955 66891D[9E4F0100]    <1> 	mov	[SWP_DRV], bx
  7497 0000E95C 8A15[4A4C0100]      <1> 	mov	dl, [FindFile_Drv]
  7498 0000E962 38DA                <1> 	cmp	dl, bl
  7499 0000E964 750B                <1> 	jne	short stsfnf_2
  7500 0000E966 86FB                <1> 	xchg	bh, bl
  7501 0000E968 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  7502 0000E96D 01DE                <1> 	add	esi, ebx
  7503 0000E96F EB0D                <1> 	jmp	short sysfnf_3
  7504                              <1> 
  7505                              <1> stsfnf_2:
  7506 0000E971 FE05[9F4F0100]      <1> 	inc	byte [SWP_DRV_chg]
  7507                              <1> 
  7508 0000E977 E84182FFFF          <1> 	call	change_current_drive
  7509 0000E97C 7245                <1> 	jc	short sysfnf_err_1 ; read error ! 
  7510                              <1> 				   ; (do not stop, because
  7511                              <1> 				   ; we don't have a
  7512                              <1> 				   ; 'no more files'
  7513                              <1> 				   ; -file not found- error,	
  7514                              <1> 				   ; next sysfnf system call
  7515                              <1> 				   ; may solve the problem,
  7516                              <1> 				   ; after re-placing the disk)				
  7517                              <1> sysfnf_3:
  7518 0000E97E A1[C04C0100]        <1> 	mov	eax, [FindFile_DirCluster]
  7519 0000E983 21C0                <1> 	and	eax, eax
  7520 0000E985 7550                <1> 	jnz	short sysfnf_6
  7521                              <1>         
  7522 0000E987 803D[A5420100]02    <1> 	cmp	byte [Current_FATType], 2
  7523 0000E98E 772C                <1> 	ja	short sysfnf_err_0 ; invalid, we neeed to stop !?
  7524 0000E990 803D[A5420100]01    <1> 	cmp	byte [Current_FATType], 1
  7525 0000E997 7223                <1> 	jb	short sysfnf_err_0 ; invalid, we neeed to stop !?
  7526                              <1> 
  7527 0000E999 3805[D04A0100]      <1> 	cmp	byte [DirBuff_ValidData], al ; 0
  7528 0000E99F 7608                <1> 	jna	short sysfnf_4 
  7529                              <1> 
  7530 0000E9A1 3B05[D54A0100]      <1> 	cmp	eax, [DirBuff_Cluster] ; 0 ?
  7531 0000E9A7 745E                <1> 	je	short sysfnf_9
  7532                              <1> 
  7533                              <1> 	;cmp	byte [Current_Dir_Level], 0
  7534                              <1>         ;ja	short sysfnf_4  
  7535                              <1>         ;jna	short sysfnf_9 
  7536                              <1> 
  7537                              <1> sysfnf_4:
  7538 0000E9A9 FE05[9F4F0100]      <1> 	inc	byte [SWP_DRV_chg]
  7539 0000E9AF E824D0FFFF          <1> 	call 	load_FAT_root_directory
  7540 0000E9B4 7351                <1> 	jnc	short sysfnf_9
  7541                              <1> 	; eax = error code (17, 'drv not ready or read error')
  7542 0000E9B6 EB0B                <1> 	jmp	short sysfnf_err_1 ; read error ! (no FNF stop)
  7543                              <1> 				   ; (if you want, try again, 
  7544                              <1> 				   ;  after re-placing the disk)
  7545                              <1> sysfnf_5:	
  7546 0000E9B8 3C0C                <1> 	cmp	al, 12 ; 'no more files' error
  7547 0000E9BA 7507                <1> 	jne	short sysfnf_err_1 ; (no FNF stop -sysfnf will try
  7548                              <1> 				   ;  to read the directory again,
  7549                              <1> 				   ;  if the user calls sysfnf
  7550                              <1> 				   ;  just after this error return-)
  7551                              <1> 	; (FNF stop -sysfnf will not try
  7552                              <1> 	;  to read the directory again-)	
  7553                              <1> 
  7554                              <1> sysfnf_err_0:
  7555 0000E9BC C605[984F0100]00    <1> 	mov	byte [FFF_Valid], 0 ; FNF stop sign
  7556                              <1> sysfnf_err_1:
  7557 0000E9C3 A3[005D0100]        <1> 	mov	[u.r0], eax
  7558 0000E9C8 A3[645D0100]        <1> 	mov	[u.error], eax
  7559 0000E9CD E8F10B0000          <1> 	call	reset_working_path
  7560 0000E9D2 E918DAFFFF          <1> 	jmp	error
  7561                              <1> 	  
  7562                              <1> sysfnf_6:
  7563 0000E9D7 803D[D04A0100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
  7564 0000E9DE 7608                <1> 	jna	short sysfnf_7
  7565                              <1> 
  7566 0000E9E0 3B05[D54A0100]      <1> 	cmp	eax, [DirBuff_Cluster]
  7567 0000E9E6 741F                <1> 	je	short sysfnf_9
  7568                              <1> 
  7569                              <1> sysfnf_7:
  7570 0000E9E8 FE05[9F4F0100]      <1> 	inc	byte [SWP_DRV_chg]
  7571 0000E9EE 803D[A5420100]01    <1> 	cmp	byte [Current_FATType], 1
  7572 0000E9F5 7309                <1> 	jnb	short sysfnf_8
  7573                              <1> 
  7574                              <1> 	; Singlix (TRFS) File System 
  7575                              <1> 	; (access via compatibility buffer)
  7576 0000E9F7 E8A4D0FFFF          <1> 	call	load_FS_sub_directory
  7577 0000E9FC 7309                <1> 	jnc	short sysfnf_9
  7578                              <1> 
  7579 0000E9FE EBC3                <1> 	jmp	short sysfnf_err_1 ; read error (no FNF stop)
  7580                              <1> 
  7581                              <1> sysfnf_8:
  7582 0000EA00 E85ED0FFFF          <1> 	call	load_FAT_sub_directory	 
  7583 0000EA05 72BC                <1> 	jc	short sysfnf_err_1 ; read error (no FNF stop)
  7584                              <1> 
  7585                              <1> sysfnf_9:
  7586 0000EA07 E8F295FFFF          <1> 	call	find_next_file
  7587 0000EA0C 72AA                <1> 	jc	short sysfnf_5
  7588                              <1> 
  7589 0000EA0E A0[994F0100]        <1> 	mov	al, [FFF_Attrib]
  7590                              <1> 	;or	al, al
  7591                              <1> 	;jz	short sysfnf_10 ; 0 = No filter
  7592 0000EA13 34FF                <1> 	xor	al, 0FFh
  7593 0000EA15 20D8                <1> 	and	al, bl
  7594 0000EA17 75EE                <1> 	jnz	short sysfnf_9 ; search for next file until
  7595                              <1> 			       ; an error return from
  7596                              <1> 			       ; find_next_file procedure	
  7597                              <1> sysfnf_10:
  7598 0000EA19 0FB60D[984F0100]    <1>         movzx	ecx, byte [FFF_Valid]
  7599 0000EA20 80F980              <1> 	cmp	cl, 128 ; complete FindFile structure/table 
  7600 0000EA23 0F84A2FEFFFF        <1> 	je	sysfnf_11
  7601                              <1> 	;cmp	cl, 24  ; basic parameters
  7602                              <1> 	;je	sysfnf_12       
  7603 0000EA29 E9AFFEFFFF          <1> 	jmp	sysfnf_12
  7604                              <1> 
  7605                              <1> writei:
  7606                              <1> 	; 26/10/2016
  7607                              <1> 	; 25/10/2016
  7608                              <1> 	; 23/10/2016
  7609                              <1> 	; 22/10/2016
  7610                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
  7611                              <1> 	; 19/05/2015 - 20/05/2015 (Retro UNIX 386 v1)
  7612                              <1> 	; 12/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  7613                              <1> 	;
  7614                              <1> 	; Write data to file with first cluster number in EAX
  7615                              <1> 	; 
  7616                              <1> 	; INPUTS ->
  7617                              <1> 	;    EAX - First cluster number of the file
  7618                              <1> 	;    EBX - File number (Open file index number)
  7619                              <1> 	;    u.count - byte count to be written
  7620                              <1> 	;    u.base - points to user buffer
  7621                              <1> 	;    u.fofp - points to dword with current file offset
  7622                              <1> 	;    i.size - file size
  7623                              <1> 	;    cdev - logical dos drive number of the file
  7624                              <1> 	; OUTPUTS ->
  7625                              <1> 	;    u.count - cleared
  7626                              <1> 	;    u.nread - accumulates total bytes passed back
  7627                              <1> 	;    i.size - new file size (if file byte offset overs file size)
  7628                              <1> 	;    u.fofp - points to u.off (with new offset value)	
  7629                              <1> 	;
  7630                              <1> 	; (Retro UNIX Prototype : 11/11/2012 - 18/11/2012, UNIXCOPY.ASM)
  7631                              <1> 	; ((Modified registers: eax, edx, ebx, ecx, esi, edi, ebp)) 	
  7632                              <1> 
  7633 0000EA2E 31C9                <1> 	xor	ecx, ecx
  7634 0000EA30 890D[285D0100]      <1> 	mov 	[u.nread], ecx  ; 0
  7635 0000EA36 66890D[605D0100]    <1> 	mov	[u.pcount], cx ; 19/05/2015
  7636 0000EA3D 390D[245D0100]      <1> 	cmp 	[u.count], ecx
  7637 0000EA43 7701                <1> 	ja 	short writei_1 
  7638 0000EA45 C3                  <1> 	retn
  7639                              <1> writei_1:
  7640 0000EA46 881D[584F0100]      <1> 	mov	[writei.ofn], bl ; Open file number
  7641 0000EA4C 880D[934F0100]      <1> 	mov	[setfmod], cl ; 0 ; reset 'update lm date&time' sign
  7642                              <1> dskw_0: 
  7643                              <1> 	; 26/10/2016
  7644                              <1> 	; 22/10/2016, 23/10/2016, 25/10/2016
  7645                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
  7646                              <1> 	; 31/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
  7647                              <1> 	; 26/04/2013 - 20/09/2013 (Retro UNIX 8086 v1)
  7648                              <1> 	;
  7649                              <1> 	; 01/08/2013 (mkdir_w check)
  7650 0000EA52 E8D7000000          <1>  	call	mget_w
  7651                              <1> 	; eax = sector/block number
  7652                              <1> 
  7653 0000EA57 8B1D[105D0100]      <1> 	mov     ebx, [u.fofp]
  7654 0000EA5D 8B13                <1> 	mov	edx, [ebx]
  7655 0000EA5F 81E2FF010000        <1> 	and	edx, 1FFh  ; / test the lower 9 bits of the file offset
  7656 0000EA65 750C                <1> 	jnz	short dskw_1 ; / if its non-zero, branch
  7657                              <1> 			     ; if zero, file offset = 0,
  7658                              <1> 		       	     ; / 512, 1024,...(i.e., start of new block)
  7659 0000EA67 813D[245D0100]0002- <1> 	cmp	dword [u.count], 512
  7659 0000EA6F 0000                <1>
  7660                              <1> 				; / if zero, is there enough data to fill
  7661                              <1> 				; / an entire block? (i.e., no. of
  7662 0000EA71 7337                <1> 	jnb	short dskw_2 ; / bytes to be written greater than 512.? 
  7663                              <1> 			     ; / Yes, branch. Don't have to read block
  7664                              <1> dskw_1: ; in as no past info. is to be saved 
  7665                              <1> 	; (the entire block will be overwritten).
  7666                              <1> 	; 23/10/2016
  7667                              <1> 
  7668 0000EA73 BB[30610100]        <1> 	mov	ebx, writei_buffer
  7669                              <1> 	; esi = logical dos drive description table address
  7670                              <1> 	; eax = sector number
  7671                              <1> 	; ebx = buffer address (in kernel's memory space)
  7672                              <1> 	; ecx = sector count
  7673 0000EA78 B901000000          <1> 	mov	ecx, 1
  7674 0000EA7D E867060000          <1> 	call	disk_read
  7675                              <1> 	;call	dskrd 	; / no, must retain old info.. 
  7676                              <1> 		       	; / Hence, read block 'r1' into an I/O buffer
  7677 0000EA82 7326                <1> 	jnc	short dskw_2
  7678                              <1> 
  7679                              <1> 	; disk read error
  7680 0000EA84 B811000000          <1> 	mov	eax, 17 ; drive not ready or READ ERROR !
  7681                              <1> dskw_err: ; jump from disk write error
  7682 0000EA89 A3[005D0100]        <1> 	mov	[u.r0], eax
  7683 0000EA8E A3[645D0100]        <1> 	mov	[u.error], eax
  7684                              <1> 
  7685 0000EA93 803D[934F0100]00    <1> 	cmp	byte [setfmod], 0
  7686 0000EA9A 0F864FD9FFFF        <1> 	jna	error
  7687                              <1> 
  7688 0000EAA0 E8AF030000          <1> 	call	update_file_lmdt ; update last modif. date&time of the file
  7689                              <1> 	;mov	byte [setfmod], 0	
  7690                              <1> 
  7691 0000EAA5 E945D9FFFF          <1> 	jmp	error
  7692                              <1> 
  7693                              <1> dskw_2: ; 3:
  7694                              <1> 	; 23/10/2016
  7695 0000EAAA C605[344F0100]01    <1> 	mov	byte [writei.valid], 1 ; writei buffer contains valid data
  7696 0000EAB1 56                  <1> 	push	esi ; logical dos drive description table address
  7697                              <1> 	; EAX (r1) = block/sector number
  7698                              <1> 	;call	wslot
  7699                              <1> 		; jsr r0,wslot / set write and inhibit bits in I/O queue, 
  7700                              <1> 			   ; / proc. status=0, r5 points to 1st word of data
  7701 0000EAB2 803D[625D0100]00    <1> 	cmp	byte [u.kcall], 0
  7702 0000EAB9 770F                <1> 	ja	short dskw_4 ; zf=0 -> the caller is 'mkdir'
  7703                              <1> 	;
  7704 0000EABB 66833D[605D0100]00  <1> 	cmp	word [u.pcount], 0
  7705 0000EAC3 7705                <1> 	ja	short dskw_4
  7706                              <1> dskw_3:
  7707                              <1> 	; [u.base] = virtual address to transfer (as source address)
  7708 0000EAC5 E812FAFFFF          <1> 	call	trans_addr_r ; translate virtual address to physical (r)
  7709                              <1> dskw_4:
  7710 0000EACA BB[30610100]        <1> 	mov	ebx, writei_buffer
  7711                              <1> 	; EBX (r5) = system (I/O) buffer address
  7712 0000EACF E874FAFFFF          <1> 	call	sioreg
  7713                              <1> 	; ESI = file (user data) offset
  7714                              <1> 	; EDI = sector (I/O) buffer offset
  7715                              <1> 	; ECX = byte count
  7716                              <1> 	;
  7717 0000EAD4 F3A4                <1>   	rep	movsb
  7718                              <1> 	; 25/07/2015
  7719                              <1> 	; eax = remain bytes in buffer
  7720                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
  7721 0000EAD6 09C0                <1> 	or	eax, eax
  7722 0000EAD8 75EB                <1> 	jnz	short dskw_3 ; (page end before system buffer end!)	
  7723                              <1> 
  7724                              <1> 	; 23/10/2016
  7725 0000EADA B101                <1> 	mov	cl, 1
  7726 0000EADC 5E                  <1> 	pop	esi
  7727 0000EADD A1[384F0100]        <1> 	mov	eax, [writei.sector]
  7728                              <1> 	; esi = logical dos drive description table address
  7729                              <1> 	; eax = sector number
  7730                              <1> 	; ebx = writei buffer address
  7731                              <1> 	; ecx = sector count
  7732 0000EAE2 E8F3050000          <1> 	call	disk_write ; / yes, write the block
  7733 0000EAE7 7307                <1> 	jnc	short dskw_5
  7734                              <1> 
  7735 0000EAE9 B812000000          <1> 	mov	eax, 18 ; drive not ready or WRITE ERROR !
  7736 0000EAEE EB99                <1> 	jmp	short dskw_err
  7737                              <1> 
  7738                              <1> dskw_5:
  7739                              <1> 	; 26/10/2016
  7740 0000EAF0 0FB61D[584F0100]    <1> 	movzx	ebx, byte [writei.ofn] ; open file number
  7741 0000EAF7 C0E302              <1> 	shl	bl, 2 ; *4
  7742 0000EAFA 8B83[28530100]      <1> 	mov	eax, [ebx+OF_POINTER]
  7743 0000EB00 3B83[50530100]      <1> 	cmp	eax, [ebx+OF_SIZE]
  7744 0000EB06 7606                <1> 	jna	short dskw_6
  7745 0000EB08 8983[50530100]      <1> 	mov	[ebx+OF_SIZE], eax
  7746                              <1> dskw_6:
  7747                              <1> 	;shr	bl, 2
  7748 0000EB0E 833D[245D0100]00    <1>         cmp     dword [u.count], 0 ; / any more data to write?
  7749 0000EB15 760A                <1> 	jna	short dskw_7
  7750 0000EB17 A1[484F0100]        <1> 	mov	eax, [writei.fclust]
  7751 0000EB1C E931FFFFFF          <1> 	jmp	dskw_0 ; / yes, branch
  7752                              <1> dskw_7:
  7753                              <1>  	; update last modif. date&time of the file
  7754                              <1> 	; (also updates file size as OF_SIZE)
  7755 0000EB21 E82E030000          <1> 	call	update_file_lmdt
  7756                              <1> 	;mov	byte [setfmod], 0	
  7757                              <1> 
  7758                              <1> 	; 03/08/2013
  7759 0000EB26 C605[625D0100]00    <1> 	mov	byte [u.kcall], 0
  7760                              <1> 	; 23/10/2016
  7761                              <1> 	;mov	eax, [writei.fclust]
  7762 0000EB2D C3                  <1> 	retn
  7763                              <1> 
  7764                              <1> mget_w:
  7765                              <1> 	; 02/11/2016
  7766                              <1> 	; 01/11/2016
  7767                              <1> 	; 23/10/2016, 31/10/2016
  7768                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
  7769                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
  7770                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  7771                              <1> 	;
  7772                              <1> 	; Get existing or (allocate) a new disk block for file
  7773                              <1> 	; 
  7774                              <1> 	; INPUTS ->
  7775                              <1> 	;    [u.fofp] = file offset pointer
  7776                              <1> 	;    [i.size] = file size
  7777                              <1> 	;    [u.count] = byte count	 
  7778                              <1> 	;    EAX = First cluster
  7779                              <1> 	;    [cdev] = Logical dos drive number 	  
  7780                              <1> 	;    [writei.ofn] = File Number
  7781                              <1> 	;		   (Open file index, 0 based)
  7782                              <1> 	;    ([u.off] = file offset)
  7783                              <1> 	; OUTPUTS ->
  7784                              <1> 	;    EAX = logical sector number
  7785                              <1> 	;    ESI = Logical Dos Drive Description Table address
  7786                              <1> 	;
  7787                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI, EBP  
  7788                              <1> 
  7789 0000EB2E 8B35[105D0100]      <1>         mov     esi, [u.fofp]
  7790 0000EB34 8B2E                <1> 	mov	ebp, [esi] ; u.off (or EBX*4+OF_POINTER)
  7791                              <1> 
  7792 0000EB36 29C9                <1> 	sub	ecx, ecx
  7793 0000EB38 8A2D[E25C0100]      <1> 	mov	ch, [cdev]
  7794                              <1> 
  7795 0000EB3E BE00010900          <1> 	mov	esi, Logical_DOSDisks
  7796 0000EB43 01CE                <1> 	add	esi, ecx
  7797                              <1> 
  7798                              <1> 	; 31/10/2016
  7799 0000EB45 89C3                <1> 	mov	ebx, eax ; First Cluster or FDT address
  7800                              <1> 
  7801 0000EB47 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  7802 0000EB4B 0F86DD010000        <1> 	jna	mget_w_14 ; Singlix FS
  7803                              <1> 
  7804 0000EB51 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
  7805 0000EB55 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  7806 0000EB59 8815[364F0100]      <1> 	mov	[writei.spc], dl  ; sectors per cluster
  7807 0000EB5F F7E2                <1> 	mul	edx
  7808                              <1> 	; edx = 0
  7809                              <1> 	; eax = bytes per cluster (<= 65536)
  7810                              <1> 
  7811                              <1> 	; 02/11/2016
  7812 0000EB61 89C1                <1> 	mov	ecx, eax
  7813 0000EB63 48                  <1> 	dec	eax
  7814 0000EB64 66A3[3C4F0100]      <1> 	mov	[writei.bpc], ax	
  7815                              <1> 	
  7816 0000EB6A 89E8                <1> 	mov	eax, ebp
  7817 0000EB6C 0305[245D0100]      <1> 	add	eax, [u.count] ; next file position
  7818 0000EB72 3B05[F15D0100]      <1> 	cmp	eax, [i.size] ; <= file size ?
  7819 0000EB78 0F86FC000000        <1> 	jna	mget_w_4 ; no
  7820                              <1> 
  7821 0000EB7E F7F1                <1> 	div	ecx
  7822 0000EB80 A3[444F0100]        <1> 	mov	[writei.c_index], eax ; cluster index
  7823                              <1> 	; edx = byte offset in cluster (<= 65535)
  7824                              <1> 	;mov	[writei.offset], dx
  7825                              <1> 	;shr	dx, 9 ; / 512
  7826                              <1> 	;mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7827                              <1> 
  7828 0000EB85 29D2                <1> 	sub	edx, edx ; 01/11/2016
  7829 0000EB87 8915[384F0100]      <1> 	mov 	[writei.sector], edx ; 0
  7830 0000EB8D 668915[3E4F0100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
  7831 0000EB94 8815[374F0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7832                              <1> 
  7833 0000EB9A 89D8                <1> 	mov	eax, ebx ; First Cluster
  7834                              <1> 
  7835                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
  7836 0000EB9C 3815[344F0100]      <1> 	cmp	byte [writei.valid], dl ; 0 
  7837 0000EBA2 7624                <1> 	jna	short mget_w_0
  7838                              <1> 
  7839 0000EBA4 8815[344F0100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
  7840                              <1> 
  7841 0000EBAA 3B05[484F0100]      <1> 	cmp	eax, [writei.fclust]
  7842 0000EBB0 7516                <1> 	jne	short mget_w_0
  7843                              <1> 
  7844 0000EBB2 8A0D[E25C0100]      <1> 	mov	cl, [cdev]
  7845 0000EBB8 3A0D[354F0100]      <1> 	cmp	cl, [writei.drv]
  7846 0000EBBE 7508                <1> 	jne	short mget_w_0
  7847                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
  7848                              <1> 	;  we don't need to get last cluster & last cluster index
  7849 0000EBC0 8B0D[544F0100]      <1> 	mov	ecx, [writei.l_index]
  7850 0000EBC6 EB64                <1> 	jmp	short mget_w_2
  7851                              <1> mget_w_0:
  7852 0000EBC8 A3[484F0100]        <1> 	mov	[writei.fclust], eax ; first cluster
  7853                              <1> 	; edx = 0
  7854 0000EBCD A3[404F0100]        <1> 	mov	[writei.cluster], eax ; first cluster ; 01/11/2016
  7855 0000EBD2 8915[4C4F0100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret cluster index
  7856                              <1> 
  7857                              <1> 	; FAT file system (FAT12, FAT16, FAT32)
  7858 0000EBD8 E89BD4FFFF          <1> 	call	get_last_cluster
  7859 0000EBDD 0F822B010000        <1> 	jc	mget_w_err ; eax = error code
  7860                              <1> 		
  7861 0000EBE3 A3[504F0100]        <1> 	mov	[writei.lclust], eax ; last cluster
  7862                              <1> 
  7863 0000EBE8 8B0D[744D0100]      <1> 	mov	ecx, [glc_index] ; last cluster index
  7864 0000EBEE 890D[544F0100]      <1> 	mov	[writei.l_index], ecx
  7865                              <1> 
  7866 0000EBF4 A0[584F0100]        <1> 	mov	al, [writei.ofn]
  7867 0000EBF9 FEC0                <1> 	inc	al
  7868 0000EBFB A2[934F0100]        <1> 	mov	[setfmod], al ; update lm date&time sign
  7869                              <1> 
  7870                              <1> mget_w_1:
  7871 0000EC00 3B0D[444F0100]      <1> 	cmp	ecx, [writei.c_index]  ; last cluster index
  7872 0000EC06 7324                <1> 	jnb	short mget_w_2 ; 01/11/2016
  7873                              <1> 
  7874 0000EC08 A1[504F0100]        <1> 	mov	eax, [writei.lclust]
  7875                              <1> 	; EAX = Last cluster
  7876 0000EC0D E874D5FFFF          <1> 	call	add_new_cluster
  7877 0000EC12 0F82F6000000        <1> 	jc	mget_w_err ; eax = error code
  7878                              <1> 	; edx = 0
  7879 0000EC18 A3[504F0100]        <1> 	mov	[writei.lclust], eax ; (new) last cluster
  7880 0000EC1D 8B0D[544F0100]      <1> 	mov	ecx, [writei.l_index]
  7881 0000EC23 41                  <1> 	inc	ecx ; add 1 to last cluster index
  7882 0000EC24 890D[544F0100]      <1> 	mov	[writei.l_index], ecx ; current last cluster index
  7883                              <1> 
  7884 0000EC2A EBD4                <1> 	jmp	short mget_w_1
  7885                              <1> 
  7886                              <1> mget_w_2:
  7887 0000EC2C 89E9                <1> 	mov	ecx, ebp
  7888 0000EC2E 030D[245D0100]      <1> 	add	ecx, [u.count]
  7889 0000EC34 890D[F15D0100]      <1> 	mov	[i.size], ecx ; save new file size
  7890                              <1> 	;sub	edx, edx ; 0
  7891                              <1> 
  7892 0000EC3A A0[E25C0100]        <1> 	mov	al, [cdev]
  7893 0000EC3F A2[354F0100]        <1> 	mov	[writei.drv], al ; physical drive number
  7894                              <1> 	; edx = 0
  7895 0000EC44 89E8                <1> 	mov	eax, ebp ; file offset
  7896 0000EC46 0FB70D[3C4F0100]    <1> 	movzx	ecx, word [writei.bpc] ; bytes per cluster - 1
  7897 0000EC4D 41                  <1> 	inc	ecx ; bytes per cluster
  7898 0000EC4E F7F1                <1> 	div	ecx
  7899                              <1> 	; edx = byte offset in cluster (<= 65535)
  7900                              <1> 	; eax = cluster index
  7901 0000EC50 A3[444F0100]        <1> 	mov	[writei.c_index], eax
  7902 0000EC55 668915[3E4F0100]    <1> 	mov	[writei.offset], dx
  7903 0000EC5C 66C1EA09            <1> 	shr	dx, 9 ; / 512
  7904 0000EC60 8815[374F0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7905                              <1> 
  7906                              <1> mget_w_3:
  7907 0000EC66 3B05[544F0100]      <1> 	cmp	eax, [writei.l_index] ; last cluster index
  7908 0000EC6C 752A                <1> 	jne	short mget_w_5
  7909                              <1> 
  7910 0000EC6E A3[4C4F0100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
  7911 0000EC73 A1[504F0100]        <1> 	mov	eax, [writei.lclust] ; last cluster
  7912 0000EC78 EB60                <1> 	jmp	short mget_w_10
  7913                              <1> 
  7914                              <1> mget_w_4: ; 02/11/2016
  7915                              <1> 	; eax = next file position
  7916 0000EC7A 2B05[245D0100]      <1> 	sub	eax, [u.count] ; current file position
  7917                              <1> 	; edx = 0
  7918                              <1> 	; ecx = bytes per cluster
  7919 0000EC80 F7F1                <1> 	div	ecx
  7920 0000EC82 A3[444F0100]        <1> 	mov	[writei.c_index], eax ; cluster index
  7921 0000EC87 668915[3E4F0100]    <1> 	mov	[writei.offset], dx
  7922 0000EC8E 66C1EA09            <1> 	shr	dx, 9 ; / 512
  7923 0000EC92 8815[374F0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7924                              <1> 
  7925                              <1> mget_w_5:
  7926 0000EC98 21C0                <1> 	and	eax, eax ; 0 = First Cluster's index number
  7927 0000EC9A 750C                <1> 	jnz	short mget_w_6
  7928                              <1> 
  7929 0000EC9C A3[4C4F0100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
  7930 0000ECA1 A1[484F0100]        <1> 	mov	eax, [writei.fclust] ; first cluster
  7931 0000ECA6 EB32                <1> 	jmp	short mget_w_10
  7932                              <1> 
  7933                              <1> mget_w_6:
  7934 0000ECA8 3B05[4C4F0100]      <1> 	cmp	eax, [writei.fs_index] ; current cluster index (>0)
  7935 0000ECAE 7507                <1> 	jne	short mget_w_7
  7936 0000ECB0 A1[404F0100]        <1> 	mov	eax, [writei.cluster] ; current cluster 
  7937 0000ECB5 EB3A                <1> 	jmp	short mget_w_11
  7938                              <1> 
  7939                              <1> mget_w_7:
  7940 0000ECB7 89C1                <1> 	mov	ecx, eax
  7941 0000ECB9 2B0D[4C4F0100]      <1> 	sub	ecx, [writei.fs_index]
  7942 0000ECBF 730D                <1> 	jnc	short mget_w_8
  7943                              <1> 	; get cluster by index from the first cluster
  7944 0000ECC1 A1[484F0100]        <1> 	mov	eax, [writei.fclust]
  7945 0000ECC6 8B0D[444F0100]      <1> 	mov	ecx, [writei.c_index]
  7946 0000ECCC EB05                <1> 	jmp	short mget_w_9
  7947                              <1> 
  7948                              <1> mget_w_8:
  7949 0000ECCE A1[404F0100]        <1> 	mov	eax, [writei.cluster] ; beginning cluster
  7950                              <1> 	; ecx = cluster sequence number after the beginning cluster
  7951                              <1> 	; sub	edx, edx ; 0
  7952                              <1> 
  7953                              <1> mget_w_9:
  7954                              <1> 	; EAX = Beginning cluster
  7955                              <1> 	; EDX = Sector index in disk/file section
  7956                              <1> 	;	(Only for SINGLIX file system!)
  7957                              <1> 	; ECX = Cluster sequence number after the beginning cluster
  7958                              <1> 	; ESI = Logical DOS Drive Description Table address
  7959 0000ECD3 E8B4D5FFFF          <1> 	call	get_cluster_by_index
  7960 0000ECD8 7234                <1> 	jc	short mget_w_err ; error code in EAX
  7961                              <1> 	; EAX = Cluster number		
  7962                              <1> mget_w_10:
  7963 0000ECDA A3[404F0100]        <1> 	mov	[writei.cluster], eax ; FDT number for Singlix File System
  7964                              <1> 
  7965 0000ECDF 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  7966 0000ECE3 7638                <1> 	jna	short mget_w_13
  7967                              <1> 	; 01/11/2016
  7968 0000ECE5 8B15[444F0100]      <1> 	mov	edx, [writei.c_index]
  7969 0000ECEB 8915[4C4F0100]      <1> 	mov	[writei.fs_index], edx
  7970                              <1> mget_w_11:
  7971 0000ECF1 83E802              <1> 	sub	eax, 2
  7972 0000ECF4 0FB615[364F0100]    <1> 	movzx	edx, byte [writei.spc]
  7973 0000ECFB F7E2                <1> 	mul	edx
  7974                              <1> 
  7975 0000ECFD 034668              <1> 	add	eax, [esi+LD_DATABegin]
  7976 0000ED00 8A15[374F0100]      <1> 	mov	dl, [writei.s_index]
  7977 0000ED06 01D0                <1> 	add	eax, edx
  7978                              <1> mget_w_12:
  7979 0000ED08 A3[384F0100]        <1> 	mov	[writei.sector], eax
  7980                              <1> 	;; buffer validation must be done in writei
  7981                              <1> 	;;mov	byte [writei.valid], 1 
  7982 0000ED0D C3                  <1> 	retn
  7983                              <1> 
  7984                              <1> mget_w_err:
  7985 0000ED0E A3[645D0100]        <1> 	mov	[u.error], eax
  7986 0000ED13 A3[005D0100]        <1> 	mov	[u.r0], eax
  7987 0000ED18 E9D2D6FFFF          <1> 	jmp	error
  7988                              <1> 
  7989                              <1> mget_w_13:
  7990                              <1> 	; EAX = FDT number (Current Section)
  7991                              <1> 	; EDX = Sector index from the first section (0,1,2,3,4...)
  7992 0000ED1D 2B15[4C4F0100]      <1> 	sub	edx, [writei.fs_index]	
  7993                              <1> 	; EDX = Sector index from current section
  7994 0000ED23 8915[4C4F0100]      <1> 	mov	[writei.fs_index], edx
  7995 0000ED29 40                  <1> 	inc	eax ; the first data sector in FS disk section	
  7996 0000ED2A 01D0                <1> 	add	eax, edx
  7997 0000ED2C EBDA                <1> 	jmp	short mget_w_12
  7998                              <1> 
  7999                              <1> mget_w_14:
  8000 0000ED2E 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
  8001 0000ED31 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
  8002 0000ED33 880D[364F0100]      <1> 	mov	[writei.spc], cl  ; sectors per cluster
  8003                              <1> 	; NOTE: writei bytes per sector value is always 512 ! 
  8004 0000ED39 66C705[3C4F0100]00- <1> 	mov	word [writei.bpc], 512
  8004 0000ED41 02                  <1>
  8005                              <1> 
  8006 0000ED42 89E9                <1> 	mov	ecx, ebp
  8007 0000ED44 030D[245D0100]      <1> 	add	ecx, [u.count] ; next file position
  8008 0000ED4A 3B0D[F15D0100]      <1> 	cmp	ecx, [i.size] ; <= file size ?
  8009 0000ED50 0F86C8000000        <1> 	jna	mget_w_19 ; no
  8010                              <1> 
  8011 0000ED56 29D2                <1> 	sub	edx, edx ; 0
  8012 0000ED58 8915[384F0100]      <1> 	mov 	[writei.sector], edx ; 0
  8013 0000ED5E 668915[3E4F0100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
  8014 0000ED65 8815[374F0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  8015                              <1> 
  8016 0000ED6B C1E909              <1> 	shr	ecx, 9 ; 1 cluster = 512 bytes
  8017 0000ED6E 890D[444F0100]      <1> 	mov	[writei.c_index], ecx ; section/cluster index
  8018                              <1> 	
  8019 0000ED74 89D8                <1> 	mov	eax, ebx ; FDT number (First FDT address)
  8020                              <1> 
  8021                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
  8022 0000ED76 3815[344F0100]      <1> 	cmp	byte [writei.valid], dl ; 0 
  8023 0000ED7C 7624                <1> 	jna	short mget_w_15
  8024                              <1> 
  8025 0000ED7E 8815[344F0100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
  8026                              <1> 
  8027 0000ED84 3B05[484F0100]      <1> 	cmp	eax, [writei.fclust]
  8028 0000ED8A 7516                <1> 	jne	short mget_w_15
  8029                              <1> 
  8030 0000ED8C 8A0D[E25C0100]      <1> 	mov	cl, [cdev]
  8031 0000ED92 3A0D[354F0100]      <1> 	cmp	cl, [writei.drv]
  8032 0000ED98 7508                <1> 	jne	short mget_w_15
  8033                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
  8034                              <1> 	;  we don't need to get last cluster & last cluster index
  8035 0000ED9A 8B0D[544F0100]      <1> 	mov	ecx, [writei.l_index]
  8036 0000EDA0 EB49                <1> 	jmp	short mget_w_17
  8037                              <1> mget_w_15:
  8038 0000EDA2 A3[484F0100]        <1> 	mov	[writei.fclust], eax ; first section (FDT number)
  8039                              <1> 	; edx = 0
  8040 0000EDA7 8915[404F0100]      <1> 	mov	[writei.cluster], edx ; 0 ; current section
  8041 0000EDAD 8915[4C4F0100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret section index
  8042                              <1> 
  8043                              <1> 	; eax = FDT number (section 0 header address)
  8044 0000EDB3 E8FED4FFFF          <1> 	call	get_last_section
  8045 0000EDB8 0F8250FFFFFF        <1> 	jc	mget_w_err ; eax = error code
  8046                              <1> 
  8047 0000EDBE 8915[4C4F0100]      <1> 	mov 	[writei.fs_index], edx ; sector index in last section
  8048                              <1> 		
  8049 0000EDC4 A3[504F0100]        <1> 	mov	[writei.lclust], eax ; last section address
  8050                              <1> 
  8051 0000EDC9 8B0D[744D0100]      <1> 	mov	ecx, [glc_index] ; last section index
  8052 0000EDCF 890D[544F0100]      <1> 	mov	[writei.l_index], ecx
  8053                              <1> 
  8054 0000EDD5 A0[584F0100]        <1> 	mov	al, [writei.ofn]
  8055 0000EDDA FEC0                <1> 	inc	al
  8056 0000EDDC A2[934F0100]        <1> 	mov	[setfmod], al ; update lm date&time sign
  8057                              <1> 
  8058                              <1> mget_w_16:
  8059                              <1> 	; edx = (existing) last section (sector) index
  8060 0000EDE1 8B0D[444F0100]      <1> 	mov	ecx, [writei.c_index] ; final section (sector) index
  8061 0000EDE7 29D1                <1> 	sub	ecx, edx
  8062 0000EDE9 7633                <1> 	jna	short mget_w_19
  8063                              <1> 	 ; ecx = sector count
  8064                              <1> mget_w_17:
  8065 0000EDEB A1[504F0100]        <1> 	mov	eax, [writei.lclust]
  8066                              <1> 	; ESI = Logical dos drv desc. table address
  8067                              <1>         ; EAX = Last section
  8068                              <1>         ; (ECX = 0 for directory) 
  8069                              <1>         ; ECX = sector count (except FDT)
  8070 0000EDF0 E884CAFFFF          <1> 	call	add_new_fs_section
  8071 0000EDF5 7312                <1> 	jnc	short mget_w_18
  8072                              <1> 
  8073                              <1> 	; If error number = 27h (insufficient disk space)
  8074                              <1> 	; it is needed to check free consequent sectors
  8075                              <1> 	; (1 data sector at least and +1 section header sector) 
  8076                              <1> 
  8077 0000EDF7 83F827              <1> 	cmp	eax, 27h
  8078 0000EDFA 0F850EFFFFFF        <1> 	jne	mget_w_err ; eax = error code
  8079                              <1> 
  8080                              <1> 	; ecx = count of free consequent sectors
  8081                              <1> 	; ecx must be > 1 (1 data + 1 header sector)
  8082 0000EE00 49                  <1> 	dec	ecx
  8083 0000EE01 0F8407FFFFFF        <1> 	jz	mget_w_err
  8084 0000EE07 EBE2                <1> 	jmp	short mget_w_17
  8085                              <1> 
  8086                              <1> mget_w_18:
  8087 0000EE09 A3[504F0100]        <1> 	mov	[writei.lclust], eax ; (new) last section
  8088                              <1> 	; ecx = sector count (except section header)
  8089 0000EE0E 8B15[544F0100]      <1> 	mov	edx, [writei.l_index]
  8090 0000EE14 01CA                <1> 	add	edx, ecx ; add sector count to index
  8091 0000EE16 8915[544F0100]      <1> 	mov	[writei.l_index], edx
  8092 0000EE1C EBC3                <1> 	jmp	short mget_w_16
  8093                              <1> 
  8094                              <1> mget_w_19:
  8095 0000EE1E 89E9                <1> 	mov	ecx, ebp
  8096 0000EE20 030D[245D0100]      <1> 	add	ecx, [u.count]
  8097 0000EE26 890D[F15D0100]      <1> 	mov	[i.size], ecx ; save new file size
  8098                              <1> 	;sub	edx, edx ; 0
  8099                              <1> 
  8100 0000EE2C A0[E25C0100]        <1> 	mov	al, [cdev]
  8101 0000EE31 A2[354F0100]        <1> 	mov	[writei.drv], al ; physical drive number
  8102                              <1> 	; edx = 0
  8103 0000EE36 89E8                <1> 	mov	eax, ebp ; file offset
  8104 0000EE38 89C2                <1> 	mov	edx, eax
  8105                              <1> 	; 1 cluster = 512 bytes (for Singlix FS)
  8106 0000EE3A C1E809              <1> 	shr	eax, 9  ; / 512
  8107 0000EE3D 81E2FF010000        <1> 	and	edx, 1FFh
  8108                              <1> 	; edx = byte offset in cluster/sector (<= 511)
  8109                              <1> 	; eax = section (sector/cluster) index
  8110 0000EE43 A3[444F0100]        <1> 	mov	[writei.c_index], eax
  8111 0000EE48 668915[3E4F0100]    <1> 	mov	[writei.offset], dx
  8112                              <1> 	;mov	byte [writei.s_index], 0 ; sector index in cluster
  8113 0000EE4F E912FEFFFF          <1> 	jmp	mget_w_3
  8114                              <1> 
  8115                              <1> update_file_lmdt: ; & update file size
  8116                              <1> 	; 26/10/2016
  8117                              <1> 	; 24/10/2016
  8118                              <1> 	; 23/10/2016
  8119                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
  8120                              <1> 	;
  8121                              <1> 	; Update last modification date&time of file
  8122                              <1> 	; (call from syswrite -> writei)
  8123                              <1> 	; ((also updates file size)) // 26/10/2016
  8124                              <1> 	; 
  8125                              <1> 	; INPUT:
  8126                              <1> 	;      byte [setfmod] = open file number
  8127                              <1> 	; OUTPUT:
  8128                              <1> 	;      cf = 0 -> success !
  8129                              <1> 	;      cf = 1 -> lmdt update has been failed! 	 
  8130                              <1> 	;
  8131                              <1> 	; Modified registers: eax, ebx, ecx, edx, esi, edi       				
  8132                              <1> 	;
  8133                              <1> 
  8134                              <1> 	;cmp	byte [setfmod], 0
  8135                              <1> 	;jna	short uflmdt_2 ; nothing to do
  8136                              <1> 
  8137 0000EE54 31C0                <1> 	xor	eax, eax
  8138                              <1> 
  8139 0000EE56 0FB61D[934F0100]    <1> 	movzx	ebx, byte [setfmod]
  8140 0000EE5D FECB                <1> 	dec	bl ; open file index number (0 based)
  8141                              <1> 
  8142 0000EE5F 8AA3[00530100]      <1> 	mov	ah, [ebx+OF_DRIVE]
  8143 0000EE65 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  8144 0000EE6A 01C6                <1> 	add	esi, eax
  8145 0000EE6C C0E302              <1> 	shl	bl, 2 ; *4	
  8146 0000EE6F 8B8B[D8520100]      <1> 	mov	ecx, [ebx+OF_FCLUSTER] ; first cluster
  8147 0000EE75 8B93[A0530100]      <1> 	mov	edx, [ebx+OF_DIRCLUSTER] ; dir cluster
  8148                              <1> 
  8149 0000EE7B D0EB                <1> 	shr	bl, 1 ; /2
  8150 0000EE7D 0FB7BB[40540100]    <1> 	movzx	edi, word [ebx+OF_DIRENTRY]
  8151                              <1> 	
  8152 0000EE84 803D[D04A0100]01    <1> 	cmp	byte [DirBuff_ValidData], 1
  8153 0000EE8B 726E                <1> 	jb	short uflmdt_4
  8154                              <1> 
  8155 0000EE8D A0[CE4A0100]        <1> 	mov	al, [DirBuff_DRV]
  8156 0000EE92 2C41                <1> 	sub	al, 'A'	
  8157 0000EE94 38E0                <1> 	cmp	al, ah
  8158 0000EE96 7563                <1> 	jne	short uflmdt_4 ; different drive
  8159 0000EE98 8A4603              <1> 	mov	al, [esi+LD_FATType] 
  8160 0000EE9B 3A05[CF4A0100]      <1> 	cmp	al, [DirBuff_FATType]
  8161 0000EEA1 755B                <1> 	jne	short uflmdt_5 ; different FS type
  8162 0000EEA3 3B15[D54A0100]      <1> 	cmp	edx, [DirBuff_Cluster]
  8163 0000EEA9 7553                <1> 	jne	short uflmdt_5 ; different cluster
  8164                              <1> 
  8165                              <1> uflmdt_1:
  8166                              <1> 	; Directory buffer is ready here!
  8167                              <1> 	; OF_FCLUSTER must be compared/verified
  8168 0000EEAB BE00000800          <1> 	mov	esi, Directory_Buffer
  8169 0000EEB0 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
  8170 0000EEB4 01FE                <1> 	add	esi, edi ; offset
  8171                              <1> 	;
  8172 0000EEB6 F6460B18            <1> 	test	byte [esi+DirEntry_Attr], 18h ; Vol & Dir
  8173 0000EEBA 750F                <1> 	jnz	short uflmdt_2 ; not a valid file !
  8174 0000EEBC 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI]
  8175 0000EEC0 C1E010              <1> 	shl	eax, 16
  8176 0000EEC3 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO]
  8177 0000EEC7 39C8                <1> 	cmp	eax, ecx ; same first cluster ?
  8178 0000EEC9 7407                <1> 	je	short uflmdt_3 ; yes, it is OK !!!	
  8179                              <1> 
  8180                              <1> uflmdt_2:	
  8181                              <1> 	; save directory buffer if has modified/changed sign
  8182                              <1> 	; (It is good to save dir buff even if the searched
  8183                              <1> 	; directory entry is not found !?)
  8184 0000EECB E8FAB6FFFF          <1> 	call	save_directory_buffer
  8185 0000EED0 F9                  <1> 	stc	; update failed
  8186 0000EED1 C3                  <1> 	retn
  8187                              <1> 	
  8188                              <1> uflmdt_3:
  8189                              <1> 	; Update directory entry
  8190                              <1> 	; 26/10/2016
  8191 0000EED2 D0E3                <1> 	shl	bl, 1 ; *2 
  8192 0000EED4 8B83[50530100]      <1> 	mov	eax, [ebx+OF_SIZE] ; file size
  8193 0000EEDA 89461C              <1> 	mov	[esi+DirEntry_FileSize], eax
  8194                              <1> 	;
  8195 0000EEDD E84AB6FFFF          <1> 	call	convert_current_date_time
  8196                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  8197                              <1>         ; 	    AX = Time in dos dir entry format	
  8198 0000EEE2 66894616            <1> 	mov	[esi+DirEntry_WrtTime], ax
  8199 0000EEE6 66895618            <1> 	mov	[esi+DirEntry_WrtDate], dx	
  8200 0000EEEA 66895612            <1> 	mov	[esi+DirEntry_LastAccDate], dx
  8201 0000EEEE C605[D04A0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  8202 0000EEF5 E8D0B6FFFF          <1> 	call	save_directory_buffer
  8203 0000EEFA C3                  <1> 	retn
  8204                              <1> 
  8205                              <1> uflmdt_4:
  8206                              <1> 	; Directory buffer sector read&write
  8207                              <1> 	; 23/10/2016
  8208                              <1> 	;
  8209 0000EEFB 8A4603              <1> 	mov	al, [esi+LD_FATType]
  8210                              <1> uflmdt_5:
  8211 0000EEFE BB[38630100]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
  8212                              <1> 		
  8213 0000EF03 20C0                <1> 	and	al, al ; 0 = Singlix FS
  8214 0000EF05 0F8492000000        <1> 	jz	uflmdt_11
  8215                              <1> 
  8216 0000EF0B 21D2                <1> 	and	edx, edx
  8217 0000EF0D 7521                <1> 	jnz	short uflmdt_9
  8218                              <1> 
  8219 0000EF0F 3C02                <1> 	cmp	al, 2  ; 3 = FAT32
  8220 0000EF11 771A                <1> 	ja	short uflmdt_8
  8221                              <1> 
  8222 0000EF13 89F8                <1> 	mov	eax, edi ; directory entry index number
  8223 0000EF15 66C1E804            <1> 	shr	ax, 4 ; 16 entries per sector	 
  8224 0000EF19 034664              <1> 	add	eax, [esi+LD_ROOTBegin]
  8225                              <1> 	; eax = root directory sector
  8226                              <1> uflmdt_6:
  8227 0000EF1C 50                  <1> 	push	eax ; * ; disk sector address
  8228 0000EF1D 51                  <1> 	push	ecx ; first cluster	
  8229 0000EF1E B901000000          <1> 	mov	ecx, 1
  8230                              <1> 	; ecx = sector count
  8231 0000EF23 E8C1010000          <1> 	call	disk_read
  8232 0000EF28 59                  <1> 	pop	ecx
  8233 0000EF29 731A                <1> 	jnc	short uflmdt_10
  8234 0000EF2B 58                  <1> 	pop	eax ; *
  8235                              <1> uflmdt_7:
  8236 0000EF2C C3                  <1> 	retn	
  8237                              <1> 
  8238                              <1> uflmdt_8:
  8239 0000EF2D 8B5632              <1> 	mov	edx, [esi+LD_BPB+FAT32_RootFClust]
  8240                              <1> uflmdt_9:
  8241 0000EF30 83FA02              <1> 	cmp	edx, 2
  8242 0000EF33 72F7                <1> 	jb	short uflmdt_7 ; invalid, nothing to do
  8243                              <1> 
  8244 0000EF35 83EA02              <1> 	sub	edx, 2
  8245 0000EF38 89D0                <1> 	mov	eax, edx
  8246 0000EF3A 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  8247 0000EF3E F7E2                <1> 	mul	edx
  8248 0000EF40 034668              <1> 	add	eax, [esi+LD_DATABegin]
  8249                              <1> 	; eax = sub directory (data) sector 
  8250 0000EF43 EBD7                <1> 	jmp	short uflmdt_6
  8251                              <1> 
  8252                              <1> uflmdt_10:
  8253                              <1> 	; Directory sector buffer is ready here!
  8254                              <1> 	; OF_FCLUSTER must be compared/verified
  8255                              <1> 	; edi = dir entry index number (<= 2047)
  8256 0000EF45 6683E70F            <1> 	and	di, 0Fh ; 16 entries per sector
  8257 0000EF49 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
  8258 0000EF4D 81C7[38630100]      <1> 	add	edi, rw_buffer
  8259                              <1> 	;
  8260 0000EF53 F6470B18            <1> 	test	byte [edi+DirEntry_Attr], 18h ; Vol & Dir
  8261 0000EF57 0F856EFFFFFF        <1> 	jnz	uflmdt_2 ; not a valid file !
  8262 0000EF5D 668B5714            <1> 	mov	dx, [edi+DirEntry_FstClusHI]
  8263 0000EF61 C1E210              <1> 	shl	edx, 16
  8264 0000EF64 668B571A            <1> 	mov	dx, [edi+DirEntry_FstClusLO]
  8265 0000EF68 39CA                <1> 	cmp	edx, ecx ; same first cluster ?
  8266 0000EF6A 0F855BFFFFFF        <1> 	jne	uflmdt_2 ; no !?
  8267                              <1> 
  8268                              <1> 	; Update directory entry
  8269 0000EF70 E8B7B5FFFF          <1> 	call	convert_current_date_time
  8270                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  8271                              <1>         ; 	    AX = Time in dos dir entry format	
  8272 0000EF75 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
  8273 0000EF79 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
  8274 0000EF7D 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
  8275                              <1> 	
  8276 0000EF81 58                  <1> 	pop	eax ; *
  8277                              <1> 
  8278 0000EF82 BB[38630100]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
  8279 0000EF87 B901000000          <1> 	mov	ecx, 1
  8280                              <1> 	; esi = logical dos description table address
  8281                              <1> 	; eax = disk sector number/address (LBA)
  8282                              <1> 	; ecx = sector count
  8283                              <1> 	; ebx = buffer address
  8284 0000EF8C E849010000          <1> 	call	disk_write
  8285 0000EF91 0F8234FFFFFF        <1> 	jc	uflmdt_2
  8286                              <1> 	
  8287                              <1> 	; save directory buffer if has modified/changed sign
  8288 0000EF97 E82EB6FFFF          <1> 	call	save_directory_buffer
  8289 0000EF9C C3                  <1> 	retn
  8290                              <1> 
  8291                              <1> uflmdt_11:
  8292                              <1> 	; 24/10/2016
  8293                              <1> 	; Update last modification date & time of a file
  8294                              <1> 	; on a disk with Singlix File System.
  8295                              <1> 	;
  8296                              <1> 	; (Method: Read the FDT -File Description Table-
  8297                              <1> 	; sector of the file and update the lmdt data fields,
  8298                              <1> 	; then write FDT sector to the disk.
  8299                              <1> 	; /// It is easy but there is compatibility buffer
  8300                              <1> 	; method also for changing directory entry data and
  8301                              <1> 	; also there are some programming issues for Singlix
  8302                              <1> 	; file system (TRFS), which are not completed yet!)
  8303                              <1> 	;
  8304                              <1> 	; Not ready yet ! (24/10/2016)
  8305                              <1> 	; /// Temporary code for error return ! ///
  8306 0000EF9D 31C0                <1> 	xor	eax, eax
  8307 0000EF9F F9                  <1> 	stc
  8308 0000EFA0 C3                  <1> 	retn
  8309                              <1> 
  8310                              <1> sysalloc:
  8311                              <1> 	; 04/03/2017
  8312                              <1> 	; 20/02/2017
  8313                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
  8314                              <1> 	; (TRDOS 386 feature only!)
  8315                              <1> 	;
  8316                              <1> 	; Allocate Contiguous Memory Block/Pages (for user)
  8317                              <1> 	; (System call for DMA Buffer allocation etc.)	
  8318                              <1> 	;
  8319                              <1> 	; INPUT ->
  8320                              <1> 	;	EBX = Virtual address (for user)
  8321                              <1> 	;	     (Physical memory block/aperture
  8322                              <1> 	;	     will be mapped to this virtual address) 
  8323                              <1> 	;	ECX = Byte Count
  8324                              <1> 	;	     (will be rounded up to page border)
  8325                              <1> 	;	If ECX = 0
  8326                              <1> 	;	    System call will return with an error (cf=1)
  8327                              <1> 	;	    but ECX will contain maximum size of
  8328                              <1> 	;	    available memory aperture and physical
  8329                              <1> 	;	    (beginning) address of that aperture
  8330                              <1> 	;	    (which have maximum size) will be in EAX.
  8331                              <1> 	;	EDX = Upper limit of the requested physical memory
  8332                              <1> 	;	      block/pages.
  8333                              <1> 	;	     (The last byte address of the memory aperture 
  8334                              <1> 	;	      must not be equal to or above this limit.)	
  8335                              <1> 	;	If EDX = 0
  8336                              <1> 	; 	   there is NOLIMIT !
  8337                              <1> 	;	If EDX = 0FFFFFFFFh (-1) 
  8338                              <1> 	;	   ESI = Lower Limit !
  8339                              <1> 	;		(Beginning of the block must not be 'less'
  8340                              <1> 	;		than this.) (Must be equal to or above...)
  8341                              <1> 	;	   EDI = Upper Limit !
  8342                              <1> 	;		(End of the block must be !less! than this)
  8343                              <1> 	;		(The last byte addr of the memory aperture 
  8344                              <1> 	;		must not be equal to or above this limit.)
  8345                              <1> 	;
  8346                              <1> 	; OUTPUT ->
  8347                              <1> 	;	If CF = 0
  8348                              <1> 	;	EAX = Physical address of the allocated memory block
  8349                              <1> 	;	ECX = Allocated bytes (as rounded up to page borders)
  8350                              <1> 	;	EBX = Virtual address (as rounded up)
  8351                              <1> 	;	IF CF = 1
  8352                              <1> 	;	    Requested (size of) Memory block could not be 
  8353                              <1> 	;	    allocated to the user!	
  8354                              <1> 	;	IF CF = 1 & EAX = 0 (Insufficient memory error!)
  8355                              <1> 	;	   ECX = Total number of free bytes
  8356                              <1> 	;	         (not size of available contiguous bytes!)		 	
  8357                              <1> 	;	If CF = 1 & EAX > 0
  8358                              <1> 	;	   there is not a memory aperture with requested size
  8359                              <1> 	;	   but total free mem is not less than requested size.
  8360                              <1> 	;	   EAX = Physical addr of available memory aperture
  8361                              <1> 	;	   	 with max size 
  8362                              <1> 	;	        (but it doesn't fit to the conditions!) 	
  8363                              <1> 	;	   ECX = Size of available memory aperture in bytes.
  8364                              <1> 	;	If CF = 1 -> EAX = 0FFFFFFFFh	
  8365                              <1> 	;	   Conditions/Parameters are wrong !		 		
  8366                              <1> 	;	   ECX is same with input value.
  8367                              <1> 	;
  8368                              <1> 	; Note:	Previously allocated pages will be deallocated if
  8369                              <1> 	;       new allocation conditions are met.
  8370                              <1> 	;
  8371                              <1> 	; Note: u.break control may be included in future versions	
  8372                              <1> 	;
  8373                              <1> 
  8374 0000EFA1 31C0                <1> 	xor	eax, eax ; 0
  8375 0000EFA3 09D2                <1> 	or	edx, edx
  8376 0000EFA5 7418                <1> 	jz	short sysalloc_2 ; NOLIMIT
  8377 0000EFA7 48                  <1> 	dec	eax ; 0FFFFFFFFh  (-1)
  8378 0000EFA8 39D1                <1> 	cmp	ecx, edx
  8379 0000EFAA 7743                <1> 	ja	short sysalloc_wrong
  8380 0000EFAC 39C2                <1> 	cmp	edx, eax ; 0FFFFFFFFh (-1)
  8381 0000EFAE 750E                <1> 	jne	short sysalloc_1
  8382 0000EFB0 89FA                <1> 	mov	edx, edi ; upper limit
  8383 0000EFB2 29F7                <1> 	sub	edi, esi
  8384 0000EFB4 7639                <1> 	jna	short sysalloc_wrong
  8385 0000EFB6 39CF                <1> 	cmp	edi, ecx ; byte count
  8386 0000EFB8 7235                <1> 	jb	short sysalloc_wrong
  8387 0000EFBA 89F0                <1> 	mov	eax, esi ; lower limit, beginning address
  8388 0000EFBC EB01                <1> 	jmp	short sysalloc_2
  8389                              <1> sysalloc_1:
  8390 0000EFBE 40                  <1> 	inc	eax ; 0
  8391                              <1> sysalloc_2:
  8392                              <1> 	; EAX = Beginning address (physical)
  8393                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  8394                              <1> 	; ECX = Number of bytes to be allocated		
  8395 0000EFBF E85F64FFFF          <1> 	call	allocate_memory_block
  8396 0000EFC4 7220                <1> 	jc	short sysalloc_err
  8397                              <1> 	; EAX = Beginning (physical) addr of the allocated mem block
  8398                              <1> 	; ECX = Num of allocated bytes (rounded up to page borders) 
  8399 0000EFC6 50                  <1> 	push	eax ; * ; 04/03/2017	
  8400 0000EFC7 09D2                <1> 	or	edx, edx ; is there a limit ?
  8401 0000EFC9 7515                <1> 	jnz	short sysalloc_4 ; yes
  8402                              <1> sysalloc_3:
  8403                              <1> 	; Here, requested contiquous memory pages have been allocated
  8404                              <1> 	; on Memory Allocation Table but user's page directory 
  8405                              <1> 	; and page tables have not been updated yet!
  8406 0000EFCB 51                  <1> 	push	ecx ; **
  8407                              <1> 	; ebx = virtual address (will be rounded up to page border)
  8408                              <1> 	; ecx = number of bytes to be allocated
  8409                              <1> 	;	will be adjusted to ebx+ecx round down - ebx round up
  8410 0000EFCC E89367FFFF          <1> 	call	deallocate_user_pages 
  8411 0000EFD1 7326                <1> 	jnc	short sysalloc_5
  8412 0000EFD3 59                  <1> 	pop	ecx ; **
  8413 0000EFD4 58                  <1> 	pop	eax ; *
  8414                              <1> 	; error
  8415                              <1> 	; restore Memory Allocation Table Content
  8416 0000EFD5 E84A66FFFF          <1> 	call	deallocate_memory_block
  8417 0000EFDA 31C0                <1> 	xor	eax, eax ; 0
  8418 0000EFDC 6648                <1> 	dec	ax ; 0FFFFFFFFh
  8419 0000EFDE EB0F                <1> 	jmp	short sysalloc_wrong
  8420                              <1> sysalloc_4:
  8421                              <1> 	; check upper limit (edx) overlap
  8422                              <1> 	; ecx = byte count
  8423                              <1> 	; eax = beginning address (physical)	
  8424 0000EFE0 01C8                <1> 	add	eax, ecx
  8425 0000EFE2 39D0                <1> 	cmp	eax, edx
  8426 0000EFE4 72E5                <1> 	jb	short sysalloc_3		
  8427                              <1> sysalloc_err:
  8428 0000EFE6 8B2D[FC5C0100]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  8429 0000EFEC 894D18              <1> 	mov	[ebp+24], ecx ; return to user with ecx value 
  8430                              <1> sysalloc_wrong:
  8431                              <1> 	; eax = 0FFFFFFFFh
  8432 0000EFEF A3[005D0100]        <1> 	mov	[u.r0], eax
  8433 0000EFF4 E9F6D3FFFF          <1> 	jmp	error
  8434                              <1> sysalloc_5:
  8435 0000EFF9 8B2D[FC5C0100]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  8436 0000EFFF 894518              <1> 	mov	[ebp+24], eax ; return to user with ecx value 
  8437 0000F002 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx
  8438 0000F005 89C1                <1> 	mov	ecx, eax ; byte count (from 'deallocate_user_pages')
  8439 0000F007 5A                  <1> 	pop	edx ; ** ; discard (another) byte count
  8440 0000F008 58                  <1> 	pop	eax ; *
  8441 0000F009 A3[005D0100]        <1> 	mov	[u.r0], eax ; physical address
  8442                              <1> 	;
  8443                              <1> 	; Write newly allocated contiguous (physical) pages
  8444                              <1> 	; on page dir and page tables of current user/process	
  8445                              <1> 	; as PRESENT, USER, WRITABLE
  8446                              <1> 	; (then clear allocated pages)
  8447 0000F00E E84768FFFF          <1> 	call	allocate_user_pages
  8448 0000F013 0F83F6D3FFFF        <1> 	jnc	sysret ; OK! return to process with success...
  8449                              <1> 	;
  8450                              <1> 	; unexpected error ! insufficient memory !? conflict !?
  8451                              <1> 	; (!!?there is not a free page for a new page table?!!)
  8452                              <1> 	; We need to terminate process with error message !!!  
  8453                              <1> 	;
  8454 0000F019 8B2D[FC5C0100]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  8455 0000F01F 8B4D18              <1> 	mov	ecx, [ebp+24] ; byte count
  8456 0000F022 A1[005D0100]        <1> 	mov	eax, [u.r0]   ; physical address
  8457                              <1> 	;
  8458                              <1> 	; restore Memory Allocation Table Content
  8459 0000F027 E8F865FFFF          <1> 	call	deallocate_memory_block
  8460                              <1> 	;
  8461 0000F02C 803D[225E0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80x25 text mode?
  8462 0000F033 7407                <1> 	je	short sysalloc_6 ; yes
  8463                              <1> 	; Current mode is VGA (or CGA graphics) mode,
  8464                              <1> 	; We need to return to text mode for displaying
  8465                              <1> 	; error message just before 'sysexit'.  
  8466 0000F035 B003                <1> 	mov	al, 3
  8467 0000F037 E82925FFFF          <1> 	call	_set_mode
  8468                              <1> sysalloc_6:
  8469 0000F03C BE[44020100]        <1> 	mov	esi, beep_Insufficient_Memory ; error message
  8470 0000F041 E87772FFFF          <1> 	call	print_msg ; print/display the message
  8471 0000F046 B801000000          <1> 	mov	eax, 1 ; ax=1 is needed for 'sysexit' procedure
  8472 0000F04B E946D5FFFF          <1> 	jmp	sysexit ; and terminate the process !
  8473                              <1> 
  8474                              <1> sysdalloc:
  8475                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
  8476                              <1> 	; (TRDOS 386 feature only!)
  8477                              <1> 	;
  8478                              <1> 	; Deallocate Memory Block/Pages (for user)
  8479                              <1> 	; (Complementary call for sysalloc.)	
  8480                              <1> 	;
  8481                              <1> 	; INPUT ->
  8482                              <1> 	;	EBX = Virtual address (for user)
  8483                              <1> 	;	      (will be rounded up to page border)
  8484                              <1> 	;	ECX = Byte Count
  8485                              <1> 	;	     (will be adjusted to page borders)
  8486                              <1> 	;	If ICX = 0
  8487                              <1> 	;	   nothing to do
  8488                              <1> 	;	If EBX + ECX > User's ESP
  8489                              <1> 	;	   nothing to do		
  8490                              <1> 	; 
  8491                              <1> 	; Note: u.break control may be included in future versions	
  8492                              <1> 	;
  8493                              <1> 	; OUTPUT ->
  8494                              <1> 	;	If CF = 0
  8495                              <1> 	;	   EAX = Deallocated memory bytes
  8496                              <1> 	;	   EBX = Virtual address (as rounded up)	
  8497                              <1> 	;	IF CF = 1
  8498                              <1> 	;	   EAX = 0
  8499                              <1> 	;
  8500                              <1> 	; Note:	Main purpose of this call is to deallocate/release
  8501                              <1> 	;	previously allocated (physically) contiguous memory
  8502                              <1> 	;	pages but beginning (virtual) address may not be
  8503                              <1> 	;	followed by physically contiguous pages. So, this
  8504                              <1> 	;	system call will deallocate user's virtually
  8505                              <1> 	;	contiguous memory pages. Also, there is not any
  8506                              <1> 	;	objections to use this system call without sysalloc
  8507                              <1> 	;	system call; only possible objection is to lost data
  8508                              <1> 	;	within user's memory space, if the beginning address
  8509                              <1> 	;	and size is not proper.
  8510                              <1> 	;
  8511                              <1> 	; Note: Empty page tables will not be deallocated!!!
  8512                              <1> 	;       (they will be deallocated at process termination)
  8513                              <1> 	;
  8514                              <1> 	; Note: When the program terminates itself or when it is 
  8515                              <1> 	;	terminated by operating system kernel, all allocated
  8516                              <1> 	;	memory pages will be deallocated during termination
  8517                              <1> 	;	stage. So, 'sysdalloc' is not necessary except 
  8518                              <1> 	;	forgiving memory block to other programs/processes.
  8519                              <1> 	;	
  8520 0000F050 8B15[F85C0100]      <1> 	mov	edx, [u.sp]
  8521 0000F056 8B420C              <1> 	mov	eax, [edx+12] ; user's stack pointer
  8522 0000F059 29C8                <1> 	sub	eax, ecx ; esp - byte count
  8523 0000F05B 24FC                <1> 	and	al, 0FCh ; dword alignment
  8524 0000F05D 39D8                <1> 	cmp	eax, ebx
  8525 0000F05F 7220                <1> 	jb	short sysdalloc_err ; deallocation overlaps with stack 	
  8526                              <1> 
  8527 0000F061 31C0                <1> 	xor	eax, eax
  8528 0000F063 21C9                <1> 	and	ecx, ecx
  8529 0000F065 7407                <1> 	jz	short sysdalloc_2
  8530                              <1> 	
  8531 0000F067 E8F866FFFF          <1> 	call	deallocate_user_pages
  8532 0000F06C 7213                <1> 	jc	short sysdalloc_err
  8533                              <1> 
  8534                              <1> sysdalloc_2:
  8535 0000F06E A3[005D0100]        <1> 	mov	[u.r0], eax
  8536 0000F073 8B2D[FC5C0100]      <1> 	mov	ebp, [u.usp]
  8537 0000F079 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx
  8538 0000F07C E98ED3FFFF          <1> 	jmp	sysret
  8539                              <1> 
  8540                              <1> sysdalloc_err:
  8541 0000F081 A3[005D0100]        <1> 	mov	[u.r0], eax ; 0
  8542 0000F086 E964D3FFFF          <1> 	jmp	error
  8543                              <1> 
  8544                              <1> syscalbac:
  8545                              <1> 	; SYS CALLBACK
  8546                              <1> 	; 16/04/2017
  8547                              <1> 	; 14/04/2017
  8548                              <1> 	; 13/04/2017
  8549                              <1> 	; 28/02/2017
  8550                              <1> 	; 26/02/2017
  8551                              <1> 	; 24/02/2017
  8552                              <1> 	; 21/02/2017 - TRDOS 386 (TRDOS v2.0)
  8553                              <1> 	; (TRDOS 386 feature only!)
  8554                              <1> 	;
  8555                              <1> 	; Link or unlink IRQ callback service to/from user (ring 3)	
  8556                              <1> 	;
  8557                              <1> 	; INPUT ->
  8558                              <1> 	;	BL = IRQ number (Hardware interrupt request number)
  8559                              <1> 	;	     (0 t0 15 but IRQ 0,1,2,6,8,14,15 are prohibited)
  8560                              <1> 	;	     IRQ numbers 3,4,5,7,9,10,11,12,13 are valid
  8561                              <1> 	;	     (numbers >15 are invalid)
  8562                              <1> 	;
  8563                              <1> 	;	BH = 0 = Unlink IRQ (in BL) from user (ring 3) service
  8564                              <1> 	;	     1 = Link IRQ by using Signal Response Byte method
  8565                              <1> 	;	     2 = Link IRQ by using Callback service method 		
  8566                              <1> 	;	     3 = Link IRQ by using Auto Increment S.R.B. method 	
  8567                              <1> 	;	    >3 = invalid 
  8568                              <1> 	;	
  8569                              <1> 	;	CL = Signal Return/Response Byte value 
  8570                              <1> 	;
  8571                              <1> 	;	If BH = 2, kernel will put a counter value 
  8572                              <1> 	;	          (into the S.R.B. addr)
  8573                              <1> 	;		  between 0 to 255. (start value = CL+1)
  8574                              <1> 	;	
  8575                              <1> 	;	NOTE: counter value, for example: even and odd numbers
  8576                              <1> 	;	      may be used for -audio- DMA buffer switch 
  8577                              <1> 	;	      within double buffer method, etc. 		
  8578                              <1> 	;
  8579                              <1> 	;	EDX = Signal return (Response) byte address
  8580                              <1> 	;	       		  - or -
  8581                              <1> 	;	      Interrupt/Callback service/routine address
  8582                              <1> 	; 	
  8583                              <1> 	;	      (virtual address in user's memory space)
  8584                              <1> 	;
  8585                              <1> 	; OUTPUT ->
  8586                              <1> 	;	CF = 0 & EAX = 0 -> Successful setting
  8587                              <1> 	;	CF = 1 & EAX > 0 -> IRQ is prohibited or locked 
  8588                              <1> 	;			by another process
  8589                              <1> 	;		 eax = ERR_PERM_DENIED -> prohibited or locked
  8590                              <1> 	;		 eax = ERR_INV_PARAMETER -> 
  8591                              <1> 	;		       invalid parameter/option or bad address
  8592                              <1> 	;
  8593                              <1> 	;	NOTE: Timer callbacks are set by using 'systimer'
  8594                              <1> 	;	      system call (IRQ 0, PIT and IRQ 8, RTC)
  8595                              <1> 	;
  8596                              <1> 	;	      Direct keyboard access is performed by using
  8597                              <1> 	;	      Keyboard Interrupt (INT 32h)	 	
  8598                              <1> 	;	
  8599                              <1> 	;	      It is prohibited here because:
  8600                              <1> 	;		1) Signal Response Byte method has not advantage
  8601                              <1> 	;		   against INT 32h, function AH = 1. Also,
  8602                              <1> 	;		   keyboard service interrupt will return with
  8603                              <1> 	;		   ascii and scan codes (AL, AH) while
  8604                              <1> 	;		   SRB method has only 1 byte space for ascii code
  8605                              <1> 	;		   or scan code. One byte signal response is used 
  8606                              <1> 	;		   for ensuring very simple and very fast
  8607                              <1> 	;		   virtual to physical memory address conversion
  8608                              <1> 	;		   without any memory page crossover risk. 
  8609                              <1> 	;		   (Otherwise double page conversion or word 
  8610                              <1> 	;		   alignment would be needed.)
  8611                              <1> 	;		2) Badly written user code (callback code)
  8612                              <1> 	;		   can prevent keyboard and timesharing functions
  8613                              <1> 	;		   of the operating system via continuous and long
  8614                              <1> 	;		   keyboard event handling by callback service.
  8615                              <1> 	;		   (It can cause to lose immediate keystroke 
  8616                              <1> 	;		   response from hardware to user.)
  8617                              <1> 	;		3) If user will check any keyboard events, 'getkey'
  8618                              <1> 	;		   (or 'getchar') must have more priority than other
  8619                              <1> 	;		   (video etc.) events because only control ability
  8620                              <1> 	;		   on a procedural infinite loop is a keyboard or
  8621                              <1> 	;		   mouse event. So user can use keyboard function
  8622                              <1> 	;		   at the end or at the beginning of a loop.
  8623                              <1> 	;		   In this case, INT 32h is used for that purpose
  8624                              <1> 	;		   and timer interrupt etc. callbacks can be used
  8625                              <1> 	;		   for dynamic and synchronized data refresh/transfer
  8626                              <1> 	;		   while cpu is in a static loop (without polling).
  8627                              <1> 	;		   Keyboard Int callback is not more useful because 
  8628                              <1> 	;		   already a manual check (a key is pressed or not)
  8629                              <1> 	;		   can be performed (via INT 32h, AH = 1) efficiently
  8630                              <1> 	;		   in a loop to prevent a locked infinitive loop.
  8631                              <1> 	;
  8632                              <1> 	;	    Disk IRQs (6,14,15) have been phohibited from ring 3 
  8633                              <1> 	;	    callback because, disk operations (file system services
  8634                              <1> 	;	    etc.) are independent from user program, for fast disk r/w.
  8635                              <1> 	;	    They are not more useful at ring 3 while they are in use
  8636                              <1> 	;	    by standard diskio functions which are mandatory part of 
  8637                              <1> 	;	    (monolithic) OS kernel and mainprog command interpreter.
  8638                              <1> 	;	    INT 33h diskio functions are enough for user level disk
  8639                              <1> 	;	    r/w.				
  8640                              <1> 	;
  8641                              <1> 	; TRDOS 386 - IRQ CALLBACK structures (parameters):
  8642                              <1> 	;	
  8643                              <1> 	;	   [u.irqlock] = 1 word, IRQ flags (0-15) that indicates
  8644                              <1> 	;			which IRQs are locked by (that) user.
  8645                              <1> 	;		        Lock and unlock (by user) will change
  8646                              <1> 	;			these flags or 'terminate process' (sysexit)
  8647                              <1> 	;			will clear these flags and unlock those IRQs.
  8648                              <1> 	;			               
  8649                              <1> 	;		   	Bit 0 is for IRQ 0 and Bit 15 is for IRQ 15
  8650                              <1> 	;
  8651                              <1> 	;	   IRQ(x).owner	 : 1 byte, user, [u.uno], 0 = free (unlocked)	
  8652                              <1> 	;
  8653                              <1> 	;	   IRQ(x).method : 1 byte for callback method & status
  8654                              <1> 	;			   0 = Signal Response Byte method
  8655                              <1> 	;			   1 = Callback service method
  8656                              <1> 	;			   >1 = invalid for current 'syscalback'.
  8657                              <1> 	;			or(+) 80h = IRQ is in use by system (ring 0)
  8658                              <1> 	;			            function (audio etc.) or
  8659                              <1> 	;			   	    a device driver.	   	
  8660                              <1> 	;			(system function will ignore the lock/owner)
  8661                              <1> 	;
  8662                              <1> 	;	   IRQ(x).srb	: 1 byte, Signal Return/Response byte value
  8663                              <1> 	;			  (a fixed value by user or a counter value
  8664                              <1> 	;			 from 0 to 255, which is increased by every
  8665                              <1> 	;			 interrupt just before putting it into 
  8666                              <1> 	;			 the Signal Response byte address
  8667                              <1> 	;			 (This is not used in callback serv method)
  8668                              <1> 	;	    	  
  8669                              <1> 	;	   IRQ(x).addr	: 1 dword
  8670                              <1> 	;			  Signal Response Byte address (physical)
  8671                              <1> 	;			  		-or-
  8672                              <1> 	;			  Callback service address (virtual)
  8673                              <1> 	;
  8674                              <1> 	;	   IRQ(x).dev	: 1 byte
  8675                              <1> 	;			  0 = Default device or kernel function
  8676                              <1> 	;			  		-or-
  8677                              <1> 	;			  1-255 = Assigned device driver number
  8678                              <1> 	;
  8679                              <1> 	;	   (x) = 3,4,5,7,9,10,11,12,13
  8680                              <1> 	;
  8681                              <1> 	;	
  8682                              <1> 	;	NOTE: If user's process/program calls the kernel (INT 40h)
  8683                              <1> 	;	      while it is already running in a (ring 3) callback
  8684                              <1> 	;	      service, kernel will force (convert) system call to
  8685                              <1> 	;	      'sysrele' (sys release). So, this feature provides
  8686                              <1> 	;	      easy and simple usage of callback services without
  8687                              <1> 	;	      falling into deepless <please 'callback me' then 
  8688                              <1> 	;	      let me 'callback you'> cycles! (User must return
  8689                              <1> 	;	      from callback service by using 'sysrele' system
  8690                              <1> 	;	      call, without a significant delay. Otherwise user
  8691                              <1> 	;	      process/program may be late to catch the next event
  8692                              <1> 	;	      within same callback purpose.	    		 	
  8693                              <1> 	;
  8694                              <1> 
  8695 0000F08B 30C0                <1> 	xor	al, al ; the caller is 'syscalbac' sign/flag
  8696 0000F08D E8830D0000          <1>  	call	set_irq_callback_service
  8697                              <1> 	; 16/04/2017
  8698 0000F092 A3[005D0100]        <1> 	mov	[u.r0], eax
  8699 0000F097 0F8372D3FFFF        <1> 	jnc	sysret
  8700 0000F09D A3[645D0100]        <1> 	mov	dword [u.error], eax
  8701 0000F0A2 E948D3FFFF          <1> 	jmp	error
  8702                              <1> 
  8703                              <1> sysfpstat:
  8704                              <1> 	; 28/02/2017 - TRDOS 386 (TRDOS v2.0)
  8705                              <1> 	; (TRDOS 386 feature only!)
  8706                              <1> 	;
  8707                              <1> 	; Set or reset FPU registers save/restore option (for user)
  8708                              <1> 	;	       (during software task switching, wswap-rswap)
  8709                              <1> 	;
  8710                              <1> 	; INPUT ->
  8711                              <1> 	;	BL = 0 -> reset
  8712                              <1> 	;	BL = 1 -> set (FPU register will be saved and restored)
  8713                              <1> 	;	
  8714                              <1> 	; OUTPUT ->
  8715                              <1> 	;	cf = 0 -> no error, FPU is ready... 
  8716                              <1> 	;		  (EAX = 0)
  8717                              <1> 	;	Cf = 1 -> error, 80387 FPU is not ready !
  8718                              <1> 	;		  (EAX = 0FFFFFFFFh)
  8719                              <1> 
  8720 0000F0A7 31C0                <1> 	xor	eax, eax
  8721 0000F0A9 803D[A04F0100]00    <1> 	cmp	byte [fpready], 0
  8722 0000F0B0 7613                <1> 	jna	short sysfpstat_err	
  8723                              <1> 
  8724 0000F0B2 80E301              <1> 	and	bl, 1 ; use BIT 0 only !
  8725 0000F0B5 881D[765D0100]      <1> 	mov	[u.fpsave], bl
  8726 0000F0BB A3[005D0100]        <1> 	mov	[u.r0], eax ; 0
  8727 0000F0C0 E94AD3FFFF          <1> 	jmp	sysret	 	
  8728                              <1> 
  8729                              <1> sysfpstat_err:
  8730 0000F0C5 48                  <1> 	dec 	eax ; 0FFFFFFFFh
  8731 0000F0C6 A3[005D0100]        <1> 	mov 	[u.r0], eax ; -1
  8732 0000F0CB E91FD3FFFF          <1> 	jmp 	error
  8733                              <1> 
  8734                              <1> ;maknod: 
  8735                              <1> 	; 26/10/2016
  8736                              <1> 	; temporary
  8737                              <1> ;	retn
  8738                              <1> 	
  8739                              <1> ; temporary - 24/01/2016
  8740                              <1> 
  8741                              <1> iget:
  8742 0000F0D0 C3                  <1> 	retn
  8743                              <1> isintr:
  8744 0000F0D1 C3                  <1> 	retn
  8745                              <1> iopen:
  8746 0000F0D2 C3                  <1> 	retn
  8747                              <1> iclose:
  8748 0000F0D3 C3                  <1> 	retn
  8749                              <1> setimod:
  8750 0000F0D4 C3                  <1> 	retn
  8751                              <1> sndc:
  8752 0000F0D5 C3                  <1> 	retn
  8753                              <1> access:
  8754 0000F0D6 C3                  <1> 	retn
  8755                              <1> epoch:
  8756 0000F0D7 C3                  <1> 	retn
  8757                              <1> sleep:
  8758 0000F0D8 C3                  <1> 	retn
  8759                              <1> set_date_time:
  8760 0000F0D9 C3                  <1> 	retn
  2310                                  %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 0000F0DA 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    20 0000F0DE 777B                <1>         ja      short lba_write
    21                              <1> 
    22                              <1> chs_write:
    23                              <1> 	; 25/02/2016
    24                              <1> 	; 23/02/2016
    25 0000F0E0 C605[994B0100]03    <1> 	mov	byte [disk_rw_op], 3 ; CHS write
    26 0000F0E7 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 0000F0E9 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    47 0000F0ED 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 0000F0EF C605[994B0100]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 0000F0F6 C605[9A4B0100]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 0000F0FD 50                  <1> 	push	eax			; Linear sector #
    80 0000F0FE 51                  <1> 	push	ecx			; # of FAT/FILE/DIR sectors
    81                              <1>                 
    82 0000F0FF 0FB74E1E            <1> 	movzx	ecx, word [esi+LD_BPB+SecPerTrack]
    83                              <1> 	;movzx	ecx, byte [disk_rw_spt] ; 23/02/2016
    84 0000F103 29D2                <1> 	sub	edx, edx
    85 0000F105 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 0000F107 6689D1              <1> 	mov	cx, dx			; Sector (zero based)
    90 0000F10A 6641                <1> 	inc	cx			; To make it 1 based
    91 0000F10C 6651                <1> 	push	cx
    92 0000F10E 668B4E20            <1> 	mov	cx, [esi+LD_BPB+Heads]
    93 0000F112 6629D2              <1> 	sub	dx, dx
    94 0000F115 F7F1                <1> 	div	ecx			; Convert track to head & cyl
    95                              <1> 	; eax (ax) = cylinder, dx (dl) = head (max. FFh)
    96 0000F117 88D6                <1> 	mov	dh, dl
    97 0000F119 6659                <1> 	pop	cx			; AX=Cyl, DH=Head, CX=Sector
    98 0000F11B 8A5602              <1> 	mov	dl, [esi+LD_PhyDrvNo]
    99                              <1> 
   100 0000F11E 88C5                <1> 	mov	ch, al			; NOTE: max. 1023 cylinders !                   
   101 0000F120 C0CC02              <1> 	ror	ah, 2			; Rotate 2 bits right
   102 0000F123 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 0000F125 B001                <1> 	mov	al, 1 ; 25/02/2016
   113 0000F127 8A25[994B0100]      <1> 	mov	ah, [disk_rw_op]  ; 02h = chs read, 03h = chs write 
   114                              <1> 	;
   115 0000F12D E8D450FFFF          <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 0000F132 8825[9B4B0100]      <1> 	mov	[disk_rw_err], ah
   122                              <1> 	
   123 0000F138 59                  <1> 	pop	ecx
   124 0000F139 58                  <1> 	pop	eax
   125 0000F13A 7314                <1> 	jnc	short chs_read_ok
   126                              <1> 
   127 0000F13C 803D[9B4B0100]09    <1> 	cmp	byte [disk_rw_err], 09h ; DMA crossed 64K segment boundary
   128 0000F143 7408                <1> 	je	short chs_read_error_retn
   129                              <1>              
   130 0000F145 FE0D[9A4B0100]      <1> 	dec	byte [retry_count]
   131 0000F14B 75B0                <1> 	jnz	short chs_read_retry
   132                              <1> 
   133                              <1> chs_read_error_retn:
   134 0000F14D F9                  <1> 	stc
   135                              <1> 	;retn
   136 0000F14E 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 0000F150 40                  <1> 	inc	eax ; next sector
   154 0000F151 81C300020000        <1> 	add	ebx, 512
   155 0000F157 E29D                <1> 	loop	chs_read_next_sector
   156 0000F159 EB5E                <1> 	jmp	short update_drv_error_byte
   157                              <1> 
   158                              <1> lba_write:
   159                              <1> 	; 23/02/2016
   160 0000F15B C605[994B0100]1C    <1> 	mov	byte [disk_rw_op], 1Ch ; LBA write
   161 0000F162 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 0000F164 C605[994B0100]1B    <1> 	mov	byte [disk_rw_op], 1Bh ; LBA read
   185                              <1> 
   186                              <1> lba_rw:
   187                              <1> 	; 17/02/2016
   188 0000F16B 57                  <1> 	push	edi
   189                              <1> 
   190 0000F16C 890D[9C4B0100]      <1> 	mov	[sector_count], ecx ; total sector (read) count
   191                              <1> 
   192 0000F172 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 0000F175 81F900010000        <1> 	cmp	ecx, 256
   197 0000F17B 7605                <1> 	jna	short lba_read_rsc
   198 0000F17D B900010000          <1> 	mov	ecx, 256 ; 17/02/2016
   199                              <1> lba_read_rsc:
   200 0000F182 290D[9C4B0100]      <1> 	sub	[sector_count], ecx ; remain sectors
   201                              <1> 
   202 0000F188 89CF                <1> 	mov	edi, ecx 
   203 0000F18A 89C1                <1> 	mov	ecx, eax ; sector number/address
   204                              <1> 
   205 0000F18C C605[9A4B0100]04    <1> 	mov	byte [retry_count], 4
   206                              <1> lba_read_retry:
   207 0000F193 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 0000F195 8A25[994B0100]      <1> 	mov	ah, [disk_rw_op] ; 1Bh = LBA read, 1Ch = LBA write
   217 0000F19B E86650FFFF          <1> 	call	int13h
   218                              <1> 	; al = ? (changed)
   219                              <1> 	; ah = error code
   220 0000F1A0 8825[9B4B0100]      <1> 	mov	[disk_rw_err], ah
   221 0000F1A6 7334                <1> 	jnc	short lba_read_ok
   222 0000F1A8 80FC80              <1> 	cmp	ah, 80h ; time out?
   223 0000F1AB 740A                <1>         je      short lba_read_stc_retn
   224 0000F1AD FE0D[9A4B0100]      <1> 	dec	byte [retry_count]
   225 0000F1B3 7FDE                <1> 	jg	short lba_read_retry
   226 0000F1B5 743A                <1> 	jz	short lba_read_reset
   227                              <1> 	; sf =  1
   228                              <1> 
   229                              <1> lba_read_stc_retn:
   230 0000F1B7 F9                  <1> 	stc
   231                              <1> lba_read_retn:
   232 0000F1B8 5F                  <1> 	pop	edi
   233                              <1> 
   234                              <1> update_drv_error_byte:
   235 0000F1B9 9C                  <1> 	pushf
   236 0000F1BA 53                  <1> 	push	ebx
   237 0000F1BB 6651                <1> 	push	cx
   238                              <1> 	;or	ecx, ecx
   239                              <1> 	;jz	short udrv_errb0
   240 0000F1BD 8A0D[9B4B0100]      <1> 	mov	cl, [disk_rw_err]
   241                              <1> udrv_errb0:
   242 0000F1C3 0FB65E02            <1> 	movzx	ebx, byte [esi+LD_PhyDrvNo]
   243 0000F1C7 80FB02              <1> 	cmp	bl, 2
   244 0000F1CA 7203                <1>         jb      short udrv_errb1
   245 0000F1CC 80EB7E              <1> 	sub	bl, 7Eh
   246                              <1> 	;cmp	bl, 5
   247                              <1> 	;ja	short udrv_errb2	
   248                              <1> udrv_errb1:
   249 0000F1CF 81C3[A95C0000]      <1>         add     ebx, drv.error ; 13/02/2016
   250 0000F1D5 880B                <1> 	mov	[ebx], cl ; error code
   251                              <1> udrv_errb2:
   252 0000F1D7 6659                <1> 	pop	cx
   253 0000F1D9 5B                  <1> 	pop	ebx
   254 0000F1DA 9D                  <1> 	popf
   255 0000F1DB C3                  <1> 	retn
   256                              <1> 
   257                              <1> lba_read_ok:
   258 0000F1DC 89C8                <1> 	mov	eax, ecx ; sector number
   259 0000F1DE 01F8                <1> 	add	eax, edi ; sector number (next)
   260 0000F1E0 C1E709              <1> 	shl	edi, 9 ; sector count * 512
   261 0000F1E3 01FB                <1> 	add	ebx, edi ; next buffer offset
   262                              <1> 
   263 0000F1E5 8B0D[9C4B0100]      <1> 	mov	ecx, [sector_count] ; remaining sectors
   264 0000F1EB 09C9                <1> 	or	ecx, ecx
   265 0000F1ED 7586                <1> 	jnz	short lba_read_next
   266 0000F1EF EBC7                <1> 	jmp	short lba_read_retn
   267                              <1> 
   268                              <1> lba_read_reset:
   269 0000F1F1 B40D                <1> 	mov	ah, 0Dh ; Alternate reset
   270 0000F1F3 E80E50FFFF          <1>         call	int13h
   271                              <1> 	; al = ? (changed)
   272                              <1> 	; ah = error code
   273 0000F1F8 7399                <1> 	jnc	short lba_read_retry
   274 0000F1FA EBBC                <1> 	jmp	short lba_read_retn
  2311                                  %include 'trdosk8.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - MAIN PROGRAM : trdosk8.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 23/04/2017
     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> ; 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 0000F1FC 3A05[4F5D0100]      <1>         cmp     al, [u.uno]     ; same process ?
   114 0000F202 750C                <1> 	jne	short srunseq_2 ; no
   115                              <1> 
   116 0000F204 8A25[455D0100]      <1> 	mov	ah, [u.pri] 	; present/current priority
   117 0000F20A 80FC02              <1> 	cmp	ah, 2       	; 'run for event' priority level
   118 0000F20D 7221                <1> 	jb	short srunseq_6 ; no
   119                              <1> 
   120                              <1> srunseq_1:
   121                              <1> 	; there is nothing to do!
   122 0000F20F 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 0000F210 80FA02              <1> 	cmp	dl, 2 		; event queue
   131 0000F213 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 0000F215 3A15[455D0100]      <1> 	cmp	dl, [u.pri] 	; priority of present process
   139 0000F21B 7606                <1> 	jna	short srunseq_3 ; is high, also
   140                              <1> 	;
   141                              <1> 	; present process will be swapped/switched out
   142 0000F21D FE05[754F0100]      <1> 	inc	byte [p_change] ; 1
   143                              <1> 
   144                              <1> srunseq_3:
   145                              <1> 	; add process to 'runq_event' queue for new event
   146 0000F223 BB[EE5C0100]        <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 0000F228 E8B4F4FFFF          <1> 	call	putlu
   152 0000F22D C3                  <1> 	retn
   153                              <1> 
   154                              <1> srunseq_5:
   155 0000F22E F5                  <1> 	cmc
   156 0000F22F C3                  <1> 	retn
   157                              <1> 
   158                              <1> srunseq_6:
   159                              <1> 	; present priority of the process is not high
   160                              <1> 	
   161 0000F230 8815[455D0100]      <1> 	mov	[u.pri], dl ; new priority 
   162                              <1> 			    ; (will be used by 'tswap')
   163                              <1> 
   164 0000F236 80FA02              <1> 	cmp	dl, 2 		; high priority ?
   165 0000F239 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 0000F23B BB[F05C0100]        <1> 	mov	ebx, runq_normal ; 'run as regular' queue
   173                              <1> 
   174 0000F240 20E4                <1> 	and	ah, ah  ;  previous value of [u.pri]
   175 0000F242 75E4                <1> 	jnz	short srunseq_4
   176                              <1> 
   177 0000F244 43                  <1> 	inc	ebx
   178 0000F245 43                  <1> 	inc	ebx
   179                              <1> 	; ebx = runq_background ; 'run on backgroud' queue 
   180                              <1> 
   181 0000F246 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 0000F248 803D[445D0100]00    <1> 	cmp	byte [u.quant], 0
   191 0000F24F 772C                <1> 	ja	short clk_1
   192                              <1> 	;
   193 0000F251 803D[4F5D0100]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 0000F258 7623                <1> 	jna	short clk_1 ; yes, do not swap out
   197                              <1> 	;
   198 0000F25A 803D[F75C0100]FF    <1> 	cmp     byte [sysflg], 0FFh ; user or system space ?
   199 0000F261 7520                <1> 	jne	short clk_2 	    ; system space (sysflg <> 0FFh)
   200                              <1> 	;
   201 0000F263 66833D[465D0100]00  <1> 	cmp	word [u.intr], 0
   202 0000F26B 7616                <1> 	jna	short clk_2
   203                              <1> 	;
   204                              <1> 	; 23/05/2016
   205 0000F26D 803D[764F0100]00    <1> 	cmp	byte [multi_tasking], 0
   206 0000F274 760D                <1> 	jna	short clk_2
   207                              <1> 	;
   208 0000F276 FE05[754F0100]      <1> 	inc	byte [p_change] ; it is time to change running process	
   209 0000F27C C3                  <1> 	retn
   210                              <1> clk_1:
   211 0000F27D FE0D[445D0100]      <1> 	dec	byte [u.quant]
   212                              <1> clk_2:
   213 0000F283 C3                  <1> 	retn   ; return to (hardware) timer interrupt routine
   214                              <1> 
   215                              <1> ; 15/01/2017
   216                              <1> ; 14/01/2017
   217                              <1> ; 07/01/2017
   218                              <1> ; 02/01/2017
   219                              <1> ; 17/08/2016
   220                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   221                              <1> int34h:  ; #IOCTL# (I/O port access support for ring 3)
   222                              <1> ; 23/05/2016
   223                              <1> 	; 20/06/2016
   224                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   225                              <1> 	;
   226                              <1> 	; INPUT ->
   227                              <1> 	;	AH = 0 -> read port  (physical IO port) -byte-
   228                              <1> 	;	AH = 1 -> write port (physical IO port) -byte-
   229                              <1> 	;		AL = data byte
   230                              <1> 	;	AH = 2 -> read port  (physical IO port) -word-
   231                              <1> 	;	AH = 3 -> write port (physical IO port) -word-
   232                              <1> 	;		BX = data word
   233                              <1> 	;	AH = 4 -> read port  (physical IO port) -dword-
   234                              <1> 	;	AH = 5 -> write port (physical IO port) -dword-
   235                              <1> 	;		EBX = data dword
   236                              <1> 	;
   237                              <1> 	;	DX = Port number (<= 0FFFFh)
   238                              <1> 	;
   239                              <1> 	; OUTPUT ->
   240                              <1> 	;	AL = data byte (in al, dx)
   241                              <1> 	;	AX = data word (in ax, dx)
   242                              <1> 	;	EAX = data dword (in eax, dx)
   243                              <1> 	;
   244                              <1> 	;	(ECX = actual TRANSFER COUNT for string functions)
   245                              <1> 	;
   246                              <1> 	;
   247                              <1> 	; Modified registers: EAX
   248                              <1> 	;
   249                              <1> 
   250 0000F284 80FC05              <1> 	cmp	ah, 5
   251 0000F287 7739                <1> 	ja	short int34h_5 ; invalid function !
   252                              <1> 
   253                              <1> 	;; 15/01/2017
   254                              <1> 	; 14/01/2017
   255                              <1> 	; 02/01/2017
   256                              <1> 	;;mov	byte [ss:intflg], 34h	; IOCTL interrupt 
   257 0000F289 FB                  <1> 	sti
   258                              <1> 	
   259                              <1> 	;sti	; enable interrupts
   260 0000F28A 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   261                              <1> 
   262 0000F28F 80FC01              <1> 	cmp	ah, 1
   263 0000F292 7205                <1> 	jb	short int34h_0
   264 0000F294 7705                <1> 	ja	short int34h_1
   265                              <1> 
   266 0000F296 EE                  <1> 	out	dx, al
   267                              <1> 	;iretd
   268 0000F297 EB01                <1> 	jmp short int34h_iret
   269                              <1> 
   270                              <1> int34h_0:
   271 0000F299 EC                  <1> 	in	al, dx
   272                              <1> 	;iretd
   273                              <1> int34h_iret:
   274                              <1> 	;cli	; 07/01/2017
   275                              <1> 	;; 15/01/2017
   276                              <1> 	;;mov	byte [ss:intflg], 0 ; reset
   277 0000F29A CF                  <1> 	iretd 
   278                              <1> 
   279                              <1> int34h_1:
   280 0000F29B F6C401              <1> 	test	ah, 1
   281 0000F29E 7511                <1> 	jnz	short int34h_3 ; out
   282                              <1> 
   283                              <1> 	; in
   284 0000F2A0 80FC02              <1> 	cmp	ah, 2
   285 0000F2A3 7707                <1> 	ja	short int34h_2
   286                              <1> 
   287 0000F2A5 6689D8              <1> 	mov	ax, bx
   288 0000F2A8 66ED                <1> 	in	ax, dx
   289                              <1> 	;iretd
   290 0000F2AA EBEE                <1> 	jmp	short int34h_iret
   291                              <1> 
   292                              <1> int34h_2:
   293                              <1> 	; ah = 4
   294 0000F2AC 89D8                <1> 	mov	eax, ebx
   295 0000F2AE ED                  <1> 	in	eax, dx
   296                              <1> 	;iretd
   297 0000F2AF EBE9                <1> 	jmp	short int34h_iret
   298                              <1> 
   299                              <1> int34h_3:
   300 0000F2B1 80FC03              <1> 	cmp	ah, 3
   301 0000F2B4 7707                <1> 	ja	short int34h_4
   302                              <1> 
   303 0000F2B6 6689D8              <1> 	mov	ax, bx
   304 0000F2B9 66EF                <1> 	out	dx, ax
   305                              <1> 	;iretd
   306 0000F2BB EBDD                <1> 	jmp	short int34h_iret
   307                              <1> 
   308                              <1> int34h_4:
   309                              <1> 	; ah = 5
   310 0000F2BD 89D8                <1> 	mov	eax, ebx
   311 0000F2BF EF                  <1> 	out	dx, eax
   312                              <1> 	;iretd
   313 0000F2C0 EBD8                <1> 	jmp	short int34h_iret
   314                              <1> 
   315                              <1> int34h_5:
   316 0000F2C2 804C240801          <1> 	or	byte [esp+8], 1	; set carry bit of eflags register
   317 0000F2C7 CF                  <1> 	iretd
   318                              <1> 
   319                              <1> INT4Ah:
   320                              <1> 	; 24/01/2016
   321                              <1> 	; this procedure will be called by 'RTC_INT' (in 'timer.s')
   322 0000F2C8 C3                  <1> 	retn
   323                              <1> 
   324                              <1> ; u0.s
   325                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - SYS0.INC
   326                              <1> ; Last Modification: 20/11/2015
   327                              <1> 
   328                              <1> com2_int:
   329                              <1> 	; 07/11/2015 
   330                              <1> 	; 24/10/2015
   331                              <1> 	; 23/10/2015
   332                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - Beginning)
   333                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1)
   334                              <1> 	; < serial port 2 interrupt handler >
   335                              <1> 	;
   336 0000F2C9 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   337                              <1> 	;push	eax
   338 0000F2CC 66B80900            <1> 	mov	ax, 9
   339 0000F2D0 EB07                <1> 	jmp	short comm_int
   340                              <1> com1_int:
   341                              <1> 	; 07/11/2015
   342                              <1> 	; 24/10/2015
   343 0000F2D2 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   344                              <1> 	; 23/10/2015
   345                              <1> 	;push	eax
   346 0000F2D5 66B80800            <1> 	mov	ax, 8
   347                              <1> comm_int:
   348                              <1> 	; 20/11/2015
   349                              <1> 	; 18/11/2015
   350                              <1> 	; 17/11/2015
   351                              <1> 	; 16/11/2015
   352                              <1> 	; 09/11/2015
   353                              <1> 	; 08/11/2015
   354                              <1> 	; 07/11/2015
   355                              <1> 	; 06/11/2015 (serial4.asm, 'serial')	
   356                              <1> 	; 01/11/2015
   357                              <1> 	; 26/10/2015
   358                              <1> 	; 23/10/2015
   359 0000F2D9 53                  <1> 	push	ebx
   360 0000F2DA 56                  <1> 	push	esi
   361 0000F2DB 57                  <1> 	push	edi
   362 0000F2DC 1E                  <1> 	push 	ds
   363 0000F2DD 06                  <1> 	push 	es
   364                              <1> 	; 18/11/2015
   365 0000F2DE 0F20DB              <1> 	mov	ebx, cr3
   366 0000F2E1 53                  <1> 	push	ebx ; ****
   367                              <1> 	;
   368 0000F2E2 51                  <1> 	push	ecx ; ***
   369 0000F2E3 52                  <1> 	push	edx ; **
   370                              <1> 	;
   371 0000F2E4 BB10000000          <1> 	mov	ebx, KDATA
   372 0000F2E9 8EDB                <1> 	mov	ds, bx
   373 0000F2EB 8EC3                <1> 	mov	es, bx
   374                              <1> 	;
   375 0000F2ED 8B0D[E0410100]      <1> 	mov	ecx, [k_page_dir]
   376 0000F2F3 0F22D9              <1> 	mov	cr3, ecx
   377                              <1> 	; 20/11/2015
   378                              <1> 	; Interrupt identification register
   379 0000F2F6 66BAFA02            <1> 	mov	dx, 2FAh ; COM2
   380                              <1> 	;
   381 0000F2FA 3C08                <1> 	cmp 	al, 8 
   382 0000F2FC 7702                <1> 	ja 	short com_i0
   383                              <1> 	;
   384                              <1> 	; 20/11/2015
   385                              <1> 	; 17/11/2015
   386                              <1> 	; 16/11/2015
   387                              <1> 	; 15/11/2015
   388                              <1> 	; 24/10/2015
   389                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - Beginning)
   390                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1)
   391                              <1> 	; < serial port 1 interrupt handler >
   392                              <1> 	;
   393 0000F2FE FEC6                <1> 	inc	dh ; 3FAh ; COM1 Interrupt id. register
   394                              <1> com_i0:
   395                              <1> 	;push	eax ; *
   396                              <1> 	; 07/11/2015
   397 0000F300 A2[4A420100]        <1> 	mov 	byte [ccomport], al
   398                              <1> 	; 09/11/2015
   399 0000F305 0FB7D8              <1> 	movzx	ebx, ax ; 8 or 9
   400                              <1> 	; 17/11/2015
   401                              <1>  	; reset request for response status
   402 0000F308 88A3[40420100]      <1> 	mov	[ebx+req_resp-8], ah ; 0
   403                              <1> 	;
   404                              <1> 	; 20/11/2015
   405 0000F30E EC                  <1> 	in	al, dx		; read interrupt id. register
   406 0000F30F EB00                <1> 	JMP	$+2	   	; I/O DELAY
   407 0000F311 2404                <1> 	and	al, 4		; received data available?	
   408 0000F313 7470                <1> 	jz	short com_eoi	; (transmit. holding reg. empty)
   409                              <1> 	;
   410                              <1> 	; 20/11/2015
   411 0000F315 80EA02              <1> 	sub	dl, 3FAh-3F8h	; data register (3F8h, 2F8h)
   412 0000F318 EC                  <1> 	in	al, dx     	; read character
   413                              <1> 	;JMP	$+2	   	; I/O DELAY
   414                              <1> 	; 08/11/2015
   415                              <1> 	; 07/11/2015
   416 0000F319 89DE                <1> 	mov	esi, ebx 
   417 0000F31B 89DF                <1> 	mov	edi, ebx
   418 0000F31D 81C6[44420100]      <1> 	add 	esi, rchar - 8 ; points to last received char
   419 0000F323 81C7[46420100]      <1> 	add	edi, schar - 8 ; points to last sent char
   420 0000F329 8806                <1> 	mov	[esi], al ; received char (current char)
   421                              <1> 	; query
   422 0000F32B 20C0                <1> 	and	al, al
   423 0000F32D 7527                <1> 	jnz	short com_i2
   424                              <1>    	; response
   425                              <1> 	; 17/11/2015
   426                              <1> 	; set request for response status
   427 0000F32F FE83[40420100]      <1>         inc     byte [ebx+req_resp-8] ; 1 
   428                              <1> 	;
   429 0000F335 6683C205            <1> 	add	dx, 3FDh-3F8h	; (3FDh, 2FDh)
   430 0000F339 EC                  <1> 	in	al, dx	   	; read line status register 
   431 0000F33A EB00                <1> 	JMP	$+2	   	; I/O DELAY
   432 0000F33C 2420                <1> 	and	al, 20h	   	; transmitter holding reg. empty?
   433 0000F33E 7445                <1> 	jz	short com_eoi 	; no
   434 0000F340 B0FF                <1> 	mov 	al, 0FFh   	; response			
   435 0000F342 6683EA05            <1> 	sub	dx, 3FDh-3F8h 	; data port (3F8h, 2F8h)
   436 0000F346 EE                  <1> 	out	dx, al	   	; send on serial port
   437                              <1> 	; 17/11/2015
   438 0000F347 803F00              <1> 	cmp 	byte [edi], 0   ; query ? (schar)
   439 0000F34A 7502                <1> 	jne 	short com_i1    ; no
   440 0000F34C 8807                <1> 	mov	[edi], al 	; 0FFh (responded)
   441                              <1> com_i1:
   442                              <1> 	; 17/11/2015
   443                              <1> 	; reset request for response status (again)
   444 0000F34E FE8B[40420100]      <1>         dec     byte [ebx+req_resp-8] ; 0 
   445 0000F354 EB2F                <1> 	jmp	short com_eoi
   446                              <1> com_i2:	
   447                              <1> 	; 08/11/2015
   448 0000F356 3CFF                <1> 	cmp 	al, 0FFh	; (response ?)
   449 0000F358 7417                <1> 	je	short com_i3	; (check for response signal)
   450                              <1> 	; 07/11/2015
   451 0000F35A 3C04                <1> 	cmp	al, 04h	; EOT
   452 0000F35C 751C                <1> 	jne	short com_i4	
   453                              <1> 	; EOT = 04h (End of Transmit) - 'CTRL + D'
   454                              <1> 	;(an EOT char is supposed as a ctrl+brk from the terminal)
   455                              <1> 	; 08/11/2015
   456                              <1> 		; ptty -> tty 0 to 7 (pseudo screens)
   457 0000F35E 861D[0E420100]      <1> 	xchg	bl, [ptty]  ; tty number (8 or 9)
   458 0000F364 E8CD6FFFFF          <1> 	call 	ctrlbrk
   459 0000F369 861D[0E420100]      <1> 	xchg	[ptty], bl ; (restore ptty value and BL value)
   460                              <1> 	;mov	al, 04h ; EOT
   461                              <1> 	; 08/11/2015
   462 0000F36F EB09                <1> 	jmp	short com_i4	
   463                              <1> com_i3:
   464                              <1> 	; 08/11/2015
   465                              <1> 	; If 0FFh has been received just after a query
   466                              <1> 	; (schar, ZERO), it is a response signal.
   467                              <1> 	; 17/11/2015
   468 0000F371 803F00              <1>         cmp     byte [edi], 0 ; query ? (schar)
   469 0000F374 7704                <1> 	ja	short com_i4 ; no
   470                              <1> 	; reset query status (schar)
   471 0000F376 8807                <1> 	mov	[edi], al ; 0FFh
   472 0000F378 FEC0                <1> 	inc	al ; 0
   473                              <1> com_i4:
   474                              <1> 	; 27/07/2014
   475                              <1> 	; 09/07/2014
   476 0000F37A D0E3                <1> 	shl	bl, 1	
   477 0000F37C 81C3[10420100]      <1> 	add	ebx, ttychr
   478                              <1> 	; 23/07/2014 (always overwrite)
   479                              <1> 	;;cmp	word [ebx], 0
   480                              <1> 	;;ja	short com_eoi
   481                              <1> 	;
   482 0000F382 668903              <1> 	mov	[ebx], ax   ; Save ascii code
   483                              <1> 			    ; scan code = 0
   484                              <1> com_eoi:
   485                              <1> 	;mov	al, 20h
   486                              <1> 	;out	20h, al	   ; end of interrupt
   487                              <1> 	;
   488                              <1> 	; 07/11/2015
   489                              <1>       	;pop	eax ; *
   490 0000F385 A0[4A420100]        <1> 	mov	al, byte [ccomport] ; current COM port
   491                              <1> 	 ; al = tty number (8 or 9)
   492 0000F38A E85E010000          <1>         call	wakeup
   493                              <1> com_iret:
   494                              <1> 	; 23/10/2015
   495 0000F38F 5A                  <1> 	pop	edx ; **
   496 0000F390 59                  <1> 	pop	ecx ; ***
   497                              <1> 	; 18/11/2015
   498                              <1> 	;pop	eax ; ****
   499                              <1> 	;mov	cr3, eax
   500                              <1> 	;jmp	iiret
   501 0000F391 E94A17FFFF          <1> 	jmp	iiretp
   502                              <1> 
   503                              <1> ;iiretp: ; 01/09/2015
   504                              <1> ;	; 28/08/2015
   505                              <1> ;	pop	eax ; (*) page directory
   506                              <1> ;	mov	cr3, eax
   507                              <1> ;iiret:
   508                              <1> ;	; 22/08/2014
   509                              <1> ;	mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
   510                              <1> ;	out	20h, al	; 8259 PORT
   511                              <1> ;	;
   512                              <1> ;	pop	es
   513                              <1> ;	pop	ds
   514                              <1> ;	pop	edi
   515                              <1> ;	pop	esi
   516                              <1> ;	pop	ebx ; 29/08/2014
   517                              <1> ;	pop 	eax
   518                              <1> ;	iretd
   519                              <1> 
   520                              <1> sp_init:
   521                              <1> 	; 07/11/2015
   522                              <1> 	; 29/10/2015
   523                              <1> 	; 26/10/2015
   524                              <1> 	; 23/10/2015
   525                              <1> 	; 29/06/2015
   526                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - 115200 baud)
   527                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1 - 9600 baud)
   528                              <1> 	; Initialization of Serial Port Communication Parameters
   529                              <1> 	; (COM1 base port address = 3F8h, COM1 Interrupt = IRQ 4)
   530                              <1> 	; (COM2 base port address = 2F8h, COM1 Interrupt = IRQ 3)
   531                              <1> 	;
   532                              <1> 	; ((Modified registers: EAX, ECX, EDX, EBX))
   533                              <1> 	;
   534                              <1> 	; INPUT:  (29/06/2015)
   535                              <1> 	;	AL = 0 for COM1
   536                              <1> 	;	     1 for COM2
   537                              <1> 	;	AH = Communication parameters	
   538                              <1> 	;
   539                              <1> 	;  (*) Communication parameters (except BAUD RATE):
   540                              <1> 	;	Bit	4	3	2	1	0
   541                              <1> 	;		-PARITY--   STOP BIT  -WORD LENGTH-	 		 
   542                              <1> 	;  this one -->	00 = none    0 = 1 bit  11 = 8 bits
   543                              <1> 	;		01 = odd     1 = 2 bits	10 = 7 bits
   544                              <1> 	;		11 = even
   545                              <1> 	;  Baud rate setting bits: (29/06/2015)
   546                              <1> 	;		Retro UNIX 386 v1 feature only !
   547                              <1> 	;	Bit	7    6    5  | Baud rate
   548                              <1> 	;		------------------------
   549                              <1> 	;	value	0    0    0  | Default (Divisor = 1)
   550                              <1> 	;		0    0    1  | 9600 (12)
   551                              <1> 	;		0    1    0  | 19200 (6) 
   552                              <1> 	;		0    1	  1  | 38400 (3) 
   553                              <1> 	;		1    0	  0  | 14400 (8)
   554                              <1> 	;		1    0	  1  | 28800 (4)
   555                              <1> 	;		1    1    0  | 57600 (2)
   556                              <1> 	;		1    1    1  | 115200 (1) 	
   557                              <1> 	
   558                              <1> 	; References:	
   559                              <1> 	; (1) IBM PC-XT Model 286 BIOS Source Code
   560                              <1> 	;     RS232.ASM --- 10/06/1985 COMMUNICATIONS BIOS (RS232)
   561                              <1> 	; (2) Award BIOS 1999 - ATORGS.ASM
   562                              <1> 	; (3) http://wiki.osdev.org/Serial_Ports
   563                              <1> 	;
   564                              <1> 	; Set communication parameters for COM1 (= 03h)	
   565                              <1> 	;
   566 0000F396 BB[46420100]        <1> 	mov	ebx, com1p		; COM1 parameters  
   567 0000F39B 66BAF803            <1> 	mov	dx, 3F8h		; COM1
   568                              <1> 	 ; 29/10/2015
   569 0000F39F 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   570 0000F3A3 E86F000000          <1> 	call	sp_i3	; call A4	
   571 0000F3A8 A880                <1> 	test	al, 80h
   572 0000F3AA 7410                <1> 	jz	short sp_i0 ; OK..
   573                              <1> 		; Error !
   574                              <1> 	;mov	dx, 3F8h
   575 0000F3AC 80EA05              <1> 	sub	dl, 5 ; 3FDh -> 3F8h
   576 0000F3AF 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   577 0000F3B3 E85F000000          <1> 	call	sp_i3	; call A4	
   578 0000F3B8 A880                <1> 	test	al, 80h
   579 0000F3BA 7508                <1> 	jnz	short sp_i1
   580                              <1> sp_i0:
   581                              <1>         ; (Note: Serial port interrupts will be disabled here...)	
   582                              <1>         ; (INT 14h initialization code disables interrupts.)
   583                              <1> 	;
   584 0000F3BC C603E3              <1> 	mov	byte [ebx], 0E3h ; 11100011b
   585 0000F3BF E8DC000000          <1> 	call	sp_i5 ; 29/06/2015
   586                              <1> sp_i1:
   587 0000F3C4 43                  <1> 	inc	ebx
   588 0000F3C5 66BAF802            <1> 	mov	dx, 2F8h		; COM2
   589                              <1> 	 ; 29/10/2015
   590 0000F3C9 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   591 0000F3CD E845000000          <1> 	call	sp_i3	; call A4	
   592 0000F3D2 A880                <1> 	test	al, 80h
   593 0000F3D4 7410                <1> 	jz	short sp_i2 ; OK..
   594                              <1> 		; Error !
   595                              <1> 	;mov	dx, 2F8h
   596 0000F3D6 80EA05              <1> 	sub	dl, 5 ; 2FDh -> 2F8h
   597 0000F3D9 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   598 0000F3DD E835000000          <1> 	call	sp_i3	; call A4	
   599 0000F3E2 A880                <1> 	test	al, 80h
   600 0000F3E4 7530                <1> 	jnz	short sp_i7
   601                              <1> sp_i2:
   602 0000F3E6 C603E3              <1> 	mov	byte [ebx], 0E3h ; 11100011b
   603                              <1> sp_i6:
   604                              <1> 	;; COM2 - enabling IRQ 3
   605                              <1> 	; 07/11/2015
   606                              <1> 	; 26/10/2015
   607 0000F3E9 9C                  <1> 	pushf
   608 0000F3EA FA                  <1> 	cli
   609                              <1> 	;
   610 0000F3EB 66BAFC02            <1> 	mov	dx, 2FCh   		; modem control register
   611 0000F3EF EC                  <1> 	in	al, dx 	   		; read register
   612 0000F3F0 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   613 0000F3F2 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   614 0000F3F4 EE                  <1> 	out	dx, al     		; write back to register
   615 0000F3F5 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   616 0000F3F7 66BAF902            <1> 	mov	dx, 2F9h   		; interrupt enable register
   617 0000F3FB EC                  <1> 	in	al, dx     		; read register
   618 0000F3FC EB00                <1> 	JMP	$+2	   		; I/O DELAY
   619                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   620 0000F3FE 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   621 0000F400 EE                  <1> 	out	dx, al 	   		; write back to register
   622 0000F401 EB00                <1> 	JMP	$+2        		; I/O DELAY
   623 0000F403 E421                <1> 	in	al, 21h    		; read interrupt mask register
   624 0000F405 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   625 0000F407 24F7                <1> 	and	al, 0F7h   		; enable IRQ 3 (COM2)
   626 0000F409 E621                <1> 	out	21h, al    		; write back to register
   627                              <1> 	;
   628                              <1> 	; 23/10/2015
   629 0000F40B B8[C9F20000]        <1> 	mov 	eax, com2_int
   630 0000F410 A3[E8F40000]        <1> 	mov	[com2_irq3], eax
   631                              <1> 	; 26/10/2015
   632 0000F415 9D                  <1> 	popf	
   633                              <1> sp_i7:
   634 0000F416 C3                  <1> 	retn
   635                              <1> 
   636                              <1> sp_i3:
   637                              <1> ;A4:  	;-----	INITIALIZE THE COMMUNICATIONS PORT
   638                              <1> 	; 28/10/2015
   639 0000F417 FEC2                <1> 	inc	dl	; 3F9h (2F9h)	; 3F9h, COM1 Interrupt enable register 
   640 0000F419 B000                <1> 	mov	al, 0
   641 0000F41B EE                  <1> 	out	dx, al			; disable serial port interrupt
   642 0000F41C EB00                <1> 	JMP	$+2			; I/O DELAY
   643 0000F41E 80C202              <1> 	add	dl, 2 	; 3FBh (2FBh)	; COM1 Line control register (3FBh)
   644 0000F421 B080                <1> 	mov	al, 80h			
   645 0000F423 EE                  <1> 	out	dx, al			; SET DLAB=1 ; divisor latch access bit
   646                              <1> 	;-----	SET BAUD RATE DIVISOR
   647                              <1> 	; 26/10/2015
   648 0000F424 80EA03              <1> 	sub 	dl, 3   ; 3F8h (2F8h)	; register for least significant byte
   649                              <1> 					; of the divisor value
   650 0000F427 88C8                <1> 	mov	al, cl	; 1
   651 0000F429 EE                  <1> 	out	dx, al			; 1 = 115200 baud (Retro UNIX 386 v1)
   652                              <1> 					; 2 = 57600 baud
   653                              <1> 					; 3 = 38400 baud
   654                              <1> 					; 6 = 19200 baud
   655                              <1> 					; 12 = 9600 baud (Retro UNIX 8086 v1)
   656 0000F42A EB00                <1> 	JMP	$+2			; I/O DELAY
   657 0000F42C 28C0                <1> 	sub	al, al
   658 0000F42E FEC2                <1> 	inc	dl      ; 3F9h (2F9h)	; register for most significant byte
   659                              <1> 					; of the divisor value
   660 0000F430 EE                  <1> 	out	dx, al ; 0
   661 0000F431 EB00                <1> 	JMP	$+2			; I/O DELAY
   662                              <1> 	;	
   663 0000F433 88E8                <1> 	mov	al, ch ; 3		; 8 data bits, 1 stop bit, no parity
   664                              <1> 	;and	al, 1Fh ; Bits 0,1,2,3,4	
   665 0000F435 80C202              <1> 	add	dl, 2	; 3FBh (2FBh)	; Line control register
   666 0000F438 EE                  <1> 	out	dx, al			
   667 0000F439 EB00                <1> 	JMP	$+2			; I/O DELAY
   668                              <1> 	; 29/10/2015
   669 0000F43B FECA                <1> 	dec 	dl 	; 3FAh (2FAh)	; FIFO Control register (16550/16750)
   670 0000F43D 30C0                <1> 	xor	al, al			; 0
   671 0000F43F EE                  <1> 	out	dx, al			; Disable FIFOs (reset to 8250 mode)
   672 0000F440 EB00                <1> 	JMP	$+2	
   673                              <1> sp_i4:
   674                              <1> ;A18:	;-----	COMM PORT STATUS ROUTINE
   675                              <1> 	; 29/06/2015 (line status after modem status)
   676 0000F442 80C204              <1> 	add	dl, 4	; 3FEh (2FEh)	; Modem status register
   677                              <1> sp_i4s:
   678 0000F445 EC                  <1> 	in	al, dx			; GET MODEM CONTROL STATUS
   679 0000F446 EB00                <1> 	JMP	$+2			; I/O DELAY
   680 0000F448 88C4                <1> 	mov	ah, al			; PUT IN (AH) FOR RETURN
   681 0000F44A FECA                <1> 	dec	dl	; 3FDh (2FDh)	; POINT TO LINE STATUS REGISTER
   682                              <1> 					; dx = 3FDh for COM1, 2FDh for COM2
   683 0000F44C EC                  <1> 	in	al, dx			; GET LINE CONTROL STATUS
   684                              <1> 	; AL = Line status, AH = Modem status
   685 0000F44D C3                  <1> 	retn
   686                              <1> 
   687                              <1> sp_status:
   688                              <1> 	; 29/06/2015
   689                              <1> 	; 27/06/2015 (Retro UNIX 386 v1)
   690                              <1> 	; Get serial port status
   691 0000F44E 66BAFE03            <1> 	mov	dx, 3FEh		; Modem status register (COM1)
   692 0000F452 28C6                <1> 	sub	dh, al			; dh = 2 for COM2 (al = 1)
   693                              <1> 					; dx = 2FEh for COM2
   694 0000F454 EBEF                <1> 	jmp	short sp_i4s
   695                              <1> 
   696                              <1> sp_setp: ; Set serial port communication parameters
   697                              <1> 	; 07/11/2015
   698                              <1> 	; 29/10/2015
   699                              <1> 	; 29/06/2015
   700                              <1> 	; Retro UNIX 386 v1 feature only !	
   701                              <1> 	;
   702                              <1> 	; INPUT:
   703                              <1> 	;	AL = 0 for COM1
   704                              <1> 	;	     1 for COM2
   705                              <1> 	;	AH = Communication parameters (*)
   706                              <1> 	; OUTPUT:
   707                              <1> 	;	CL = Line status
   708                              <1> 	;	CH = Modem status
   709                              <1> 	;   If cf = 1 -> Error code in [u.error]
   710                              <1> 	;		 'invalid parameter !' 
   711                              <1> 	;		 	 or
   712                              <1> 	;		 'device not ready !' error
   713                              <1> 	;	
   714                              <1> 	;  (*) Communication parameters (except BAUD RATE):
   715                              <1> 	;	Bit	4	3	2	1	0
   716                              <1> 	;		-PARITY--   STOP BIT  -WORD LENGTH-	 		 
   717                              <1> 	;  this one -->	00 = none    0 = 1 bit  11 = 8 bits
   718                              <1> 	;		01 = odd     1 = 2 bits	10 = 7 bits
   719                              <1> 	;		11 = even
   720                              <1> 	;  Baud rate setting bits: (29/06/2015)
   721                              <1> 	;		Retro UNIX 386 v1 feature only !
   722                              <1> 	;	Bit	7    6    5  | Baud rate
   723                              <1> 	;		------------------------
   724                              <1> 	;	value	0    0    0  | Default (Divisor = 1)
   725                              <1> 	;		0    0    1  | 9600 (12)
   726                              <1> 	;		0    1    0  | 19200 (6) 
   727                              <1> 	;		0    1	  1  | 38400 (3) 
   728                              <1> 	;		1    0	  0  | 14400 (8)
   729                              <1> 	;		1    0	  1  | 28800 (4)
   730                              <1> 	;		1    1    0  | 57600 (2)
   731                              <1> 	;		1    1    1  | 115200 (1) 
   732                              <1> 	;
   733                              <1> 	; (COM1 base port address = 3F8h, COM1 Interrupt = IRQ 4)
   734                              <1> 	; (COM2 base port address = 2F8h, COM1 Interrupt = IRQ 3)
   735                              <1> 	;
   736                              <1> 	; ((Modified registers: EAX, ECX, EDX, EBX))
   737                              <1> 	;
   738 0000F456 66BAF803            <1> 	mov	dx, 3F8h
   739 0000F45A BB[46420100]        <1> 	mov	ebx, com1p ; COM1 control byte offset
   740 0000F45F 3C01                <1> 	cmp	al, 1
   741 0000F461 776B                <1> 	ja 	short sp_invp_err
   742 0000F463 7203                <1> 	jb	short sp_setp1 ;  COM1 (AL = 0)
   743 0000F465 FECE                <1> 	dec	dh ; 2F8h
   744 0000F467 43                  <1> 	inc	ebx ; COM2 control byte offset
   745                              <1> sp_setp1:
   746                              <1> 	; 29/10/2015
   747 0000F468 8823                <1> 	mov	[ebx], ah
   748 0000F46A 0FB6CC              <1> 	movzx 	ecx, ah
   749 0000F46D C0E905              <1> 	shr	cl, 5 ; -> baud rate index
   750 0000F470 80E41F              <1> 	and	ah, 1Fh ; communication parameters except baud rate
   751 0000F473 8A81[DDF40000]      <1> 	mov	al, [ecx+b_div_tbl]
   752 0000F479 6689C1              <1> 	mov	cx, ax
   753 0000F47C E896FFFFFF          <1> 	call	sp_i3
   754 0000F481 6689C1              <1> 	mov	cx, ax ; CL = Line status, CH = Modem status
   755 0000F484 A880                <1> 	test	al, 80h
   756 0000F486 740F                <1> 	jz	short sp_setp2
   757 0000F488 C603E3              <1>         mov     byte [ebx], 0E3h ; Reset to initial value (11100011b)
   758                              <1> stp_dnr_err:
   759 0000F48B C705[645D0100]0F00- <1> 	mov	dword [u.error], ERR_DEV_NOT_RDY ; 'device not ready !'
   759 0000F493 0000                <1>
   760                              <1> 	; CL = Line status, CH = Modem status
   761 0000F495 F9                  <1> 	stc
   762 0000F496 C3                  <1> 	retn
   763                              <1> sp_setp2:
   764 0000F497 80FE02              <1> 	cmp	dh, 2 ; COM2 (2F?h)
   765 0000F49A 0F8649FFFFFF        <1>         jna     sp_i6 
   766                              <1> 		      ; COM1 (3F?h)
   767                              <1> sp_i5: 
   768                              <1> 	; 07/11/2015
   769                              <1> 	; 26/10/2015
   770                              <1> 	; 29/06/2015
   771                              <1> 	;
   772                              <1> 	;; COM1 - enabling IRQ 4
   773 0000F4A0 9C                  <1> 	pushf
   774 0000F4A1 FA                  <1> 	cli
   775 0000F4A2 66BAFC03            <1> 	mov	dx, 3FCh   		; modem control register
   776 0000F4A6 EC                  <1> 	in	al, dx 	   		; read register
   777 0000F4A7 EB00                <1> 	JMP	$+2			; I/O DELAY
   778 0000F4A9 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   779 0000F4AB EE                  <1> 	out	dx, al     		; write back to register
   780 0000F4AC EB00                <1> 	JMP	$+2			; I/O DELAY
   781 0000F4AE 66BAF903            <1> 	mov	dx, 3F9h   		; interrupt enable register
   782 0000F4B2 EC                  <1> 	in	al, dx     		; read register
   783 0000F4B3 EB00                <1> 	JMP	$+2			; I/O DELAY
   784                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   785 0000F4B5 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   786 0000F4B7 EE                  <1> 	out	dx, al 	   		; write back to register
   787 0000F4B8 EB00                <1> 	JMP	$+2        		; I/O DELAY
   788 0000F4BA E421                <1> 	in	al, 21h    		; read interrupt mask register
   789 0000F4BC EB00                <1> 	JMP	$+2			; I/O DELAY
   790 0000F4BE 24EF                <1> 	and	al, 0EFh   		; enable IRQ 4 (COM1)
   791 0000F4C0 E621                <1> 	out	21h, al    		; write back to register
   792                              <1> 	;
   793                              <1> 	; 23/10/2015
   794 0000F4C2 B8[D2F20000]        <1> 	mov 	eax, com1_int
   795 0000F4C7 A3[E4F40000]        <1> 	mov	[com1_irq4], eax
   796                              <1> 	; 26/10/2015
   797 0000F4CC 9D                  <1> 	popf
   798 0000F4CD C3                  <1> 	retn
   799                              <1> 
   800                              <1> sp_invp_err:
   801 0000F4CE C705[645D0100]1700- <1> 	mov	dword [u.error], ERR_INV_PARAMETER ; 'invalid parameter !' 
   801 0000F4D6 0000                <1>
   802 0000F4D8 31C9                <1> 	xor	ecx, ecx
   803 0000F4DA 49                  <1> 	dec	ecx ; 0FFFFh
   804 0000F4DB F9                  <1> 	stc
   805 0000F4DC C3                  <1> 	retn
   806                              <1> 
   807                              <1> ; 29/10/2015
   808                              <1> b_div_tbl: ; Baud rate divisor table (115200/divisor)
   809 0000F4DD 010C0603080401      <1> 	db 1, 12, 6, 3, 8, 4, 1
   810                              <1> 
   811                              <1> 
   812                              <1> ; 23/10/2015
   813                              <1> com1_irq4:
   814 0000F4E4 [ECF40000]          <1> 	dd dummy_retn
   815                              <1> com2_irq3:
   816 0000F4E8 [ECF40000]          <1> 	dd dummy_retn
   817                              <1> 
   818                              <1> dummy_retn:
   819 0000F4EC C3                  <1> 	retn
   820                              <1> 
   821                              <1> wakeup:
   822                              <1> 	; 24/01/2016
   823 0000F4ED C3                  <1> 	retn
   824                              <1> 
   825                              <1> set_working_path_x:
   826                              <1> 		; 17/10/2016 (TRDOS 386 - FFF & FNF)
   827 0000F4EE 66B80100            <1> 		mov	ax, 1 
   828                              <1> 			; File name is needed/forced (AL=1)
   829                              <1> 			; Change directory as temprorary (AH=0)	
   830                              <1> 
   831                              <1> 		; This is needed for preventing wrong Find Next File
   832                              <1> 		; system call after sysopen, syscreate, sysmkdir etc. 
   833                              <1> 		; Find Next File must immmediate follow Find First file)
   834                              <1> 
   835 0000F4F2 8825[984F0100]      <1> 		mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
   836                              <1> 
   837                              <1> set_working_path:
   838                              <1> 		; 16/10/2016
   839                              <1> 		; 12/10/2016
   840                              <1> 		; 10/10/2016
   841                              <1> 		; 05/10/2016 - TRDOS 386 (TRDOS v2.0)
   842                              <1> 		;
   843                              <1> 		; TRDOS v1.0 (DIR.ASM, "proc_set_working_path")
   844                              <1>                 ; 27/01/2011 - 08/02/2011 
   845                              <1> 		; Set/Changes current drive, directory and file
   846                              <1> 		; depending on command tail
   847                              <1> 		; (procedure is derivated from CMD_INTR.ASM 
   848                              <1> 		; file or dir locating code of internal commands)
   849                              <1> 		; (This procedure is prepared for INT 21H file/dir 
   850                              <1> 		; functions and also to get compact code for 
   851                              <1> 		; internal mainprog -command interpreter- commands)
   852                              <1> 		; 
   853                              <1> 		; INPUT: DS:SI -> Command tail (ASCIIZ string)
   854                              <1> 		; AL= 0 -> any, AL > 0 -> file name is forced
   855                              <1> 		; AH= CD -> Change directory permanently 
   856                              <1> 		; AH <> CD -> Change directory as temporary    
   857                              <1> 		; 
   858                              <1> 		; OUTPUT: ES=DS, FindFile structure has been set
   859                              <1> 		;        RUN_CDRV points previous current drive  
   860                              <1> 		;        DS:SI = FindFile structure address
   861                              <1> 		;        (DS=CS)       
   862                              <1> 		;        AX, BX, CX, DX, DI will be changed
   863                              <1> 		;   cf = 1 -> Error code in AX (AL)
   864                              <1> 		;        stc & AX = 0 -> Bad command or path name 
   865                              <1> 		; -----------------------------------------------
   866                              <1> 		;
   867                              <1> 		; TRDOS 386 (05/10/2016)
   868                              <1> 		; INPUT:
   869                              <1> 		;	ESI = File/Directory Path (ASCIIZ string)
   870                              <1> 		;             address in user's memory space
   871                              <1> 		;       Al = 0 -> any
   872                              <1> 		;       AL > 0 -> file name is forced
   873                              <1> 		;       AH = CD -> change directory as permanent
   874                              <1> 		;       AH <> CD -> change directory as temporary
   875                              <1> 		; 
   876                              <1> 		; OUTPUT:
   877                              <1> 		;	FindFile structure has been set
   878                              <1> 		;       RUN_CDRV points previous current drive  
   879                              <1> 		;       ESI = FindFile_Name address ; 12/10/2016
   880                              <1> 		;
   881                              <1> 		;       cf = 1 -> Error code in EAX (AL)
   882                              <1> 		;       stc & EAX = 0 -> Bad command or path name
   883                              <1> 		;  
   884                              <1> 		; Modified registers: EAX, EBX, ECX, EDX, ESI, EDI
   885                              <1> 
   886 0000F4F8 66A3[9C4F0100]      <1> 		mov	[SWP_Mode], ax
   887 0000F4FE A0[A6420100]        <1> 		mov	al, [Current_Drv]
   888 0000F503 30E4                <1> 		xor	ah, ah
   889 0000F505 66A3[9E4F0100]      <1> 		mov	word [SWP_DRV], ax
   890                              <1> 
   891                              <1> 		; TRDOS 386 ring 3 (user's page directory)
   892                              <1> 		; to ring 0 (kernel's page directory) 
   893                              <1> 		; transfer modifications (05/10/2016).
   894                              <1> 
   895 0000F50B 55                  <1> 		push	ebp
   896 0000F50C 89E5                <1> 		mov	ebp, esp
   897                              <1> 		
   898 0000F50E B980000000          <1> 		mov	ecx, 128 ; maximum path length = 128 bytes
   899 0000F513 29CC                <1> 		sub	esp, ecx ; reserve 128 bytes (buffer) on stack
   900 0000F515 89E7                <1> 		mov	edi, esp ; destination address (kernel space)
   901                              <1> 		; esi = source address (virtual, in user's memory space)
   902 0000F517 E8FAF2FFFF          <1> 		call	transfer_from_user_buffer
   903 0000F51C 720A                <1> 		jc	short loc_swp_xor_retn 
   904                              <1> 		
   905 0000F51E 89E6                <1> 		mov	esi, esp ; temporary buffer (the path) on stack
   906                              <1> loc_swp_fchar:
   907 0000F520 8A06                <1> 		mov	al, [esi]
   908 0000F522 3C20                <1> 		cmp	al, 20h
   909 0000F524 7711                <1> 		ja	short loc_swp_parse_path_name
   910 0000F526 740C                <1> 		je	short loc_swp_fchar_next
   911                              <1> 
   912                              <1> loc_swp_xor_retn:
   913 0000F528 31C0                <1> 		xor	eax, eax
   914 0000F52A F9                  <1> 		stc
   915                              <1> loc_swp_retn:
   916 0000F52B 89EC                <1> 		mov	esp, ebp
   917 0000F52D 5D                  <1> 		pop	ebp
   918                              <1> 
   919                              <1> 		;mov	esi, FindFile_Drv
   920 0000F52E BE[8C4C0100]        <1> 		mov	esi, FindFile_Name ; 12/10/2016
   921 0000F533 C3                  <1> 		retn 
   922                              <1> 
   923                              <1> loc_swp_fchar_next:
   924 0000F534 46                  <1> 		inc	esi
   925 0000F535 EBE9                <1> 		jmp	short loc_swp_fchar  
   926                              <1> 
   927                              <1> loc_swp_parse_path_name:
   928 0000F537 BF[4A4C0100]        <1> 		mov	edi, FindFile_Drv
   929 0000F53C E825ACFFFF          <1> 		call	parse_path_name
   930 0000F541 72E8                <1> 		jc	short loc_swp_retn
   931                              <1> 
   932                              <1> loc_swp_checkfile_name:
   933 0000F543 803D[9C4F0100]00    <1> 		cmp	byte [SWP_Mode], 0
   934 0000F54A 761E                <1> 		jna	short loc_swp_drv
   935                              <1> 
   936                              <1> 		; 10/10/2016 (valid file name checking)
   937 0000F54C BE[8C4C0100]        <1> 		mov	esi, FindFile_Name
   938 0000F551 803E20              <1> 		cmp	byte [esi], 20h
   939 0000F554 76D2                <1> 		jna	short loc_swp_xor_retn
   940                              <1> 
   941                              <1> 		; 16/10/2016
   942 0000F556 C605[9B4F0100]00    <1> 		mov	byte [SWP_inv_fname], 0 ; reset 
   943                              <1> 		; esi = file name address (ASCIIZ)
   944 0000F55D E8AD8DFFFF          <1> 		call	check_filename
   945 0000F562 7306                <1> 		jnc	short loc_swp_drv
   946                              <1> 
   947 0000F564 FE05[9B4F0100]      <1> 		inc	byte [SWP_inv_fname] ; set 	
   948                              <1> loc_swp_drv:
   949 0000F56A 8A35[A6420100]      <1> 		mov	dh, [Current_Drv]
   950                              <1>                ;mov	[RUN_CDRV], dh
   951                              <1> 
   952 0000F570 8A15[4A4C0100]      <1> 		mov	dl, [FindFile_Drv]
   953                              <1>                ;cmp	dl, dh
   954 0000F576 3A15[A6420100]      <1> 		cmp	dl, [Current_Drv]
   955 0000F57C 740D                <1> 		je	short loc_swp_change_directory
   956                              <1> 
   957 0000F57E FE05[9F4F0100]      <1> 		inc	byte [SWP_DRV_chg]
   958 0000F584 E83476FFFF          <1> 		call	change_current_drive
   959 0000F589 72A0                <1> 		jc	short loc_swp_retn ; eax = error code
   960                              <1> 		; eax = 0
   961                              <1> 
   962                              <1> loc_swp_change_directory:
   963 0000F58B 803D[4B4C0100]21    <1> 		cmp	byte [FindFile_Directory], 21h
   964 0000F592 F5                  <1> 		cmc
   965 0000F593 7396                <1> 		jnc	short loc_swp_retn
   966                              <1> 
   967 0000F595 FE05[9F4F0100]      <1> 		inc	byte [SWP_DRV_chg]
   968 0000F59B FE05[E3FE0000]      <1> 		inc	byte [Restore_CDIR]
   969 0000F5A1 BE[4B4C0100]        <1> 		mov	esi, FindFile_Directory
   970 0000F5A6 8A25[9D4F0100]      <1> 		mov	ah, [SWP_Mode+1] 
   971 0000F5AC E8A1A5FFFF          <1> 		call	change_current_directory
   972 0000F5B1 0F8274FFFFFF        <1> 		jc	loc_swp_retn ; eax = error code
   973                              <1> 
   974                              <1> loc_swp_change_prompt_dir_string:
   975                              <1> 		; esi = PATH_Array
   976                              <1> 		; eax = Current Directory First Cluster
   977                              <1> 		; edi = Logical DOS Drive Description Table	
   978 0000F5B7 E8BBA4FFFF          <1> 		call	change_prompt_dir_str 
   979 0000F5BC 29C0                <1> 		sub	eax, eax ; 0
   980 0000F5BE E968FFFFFF          <1> 		jmp	loc_swp_retn 
   981                              <1> 
   982                              <1> reset_working_path:
   983                              <1> 		; 06/10/2016 - TRDOS 386 (TRDOS v2.0)
   984                              <1> 		;
   985                              <1> 		; TRDOS v1.0 (DIR.ASM, "proc_reset_working_path")
   986                              <1> 		; 05/02/2011 - 08/02/2011 
   987                              <1> 		;
   988                              <1> 		; Restores current drive and directory 
   989                              <1> 		; 
   990                              <1> 		; INPUT: none
   991                              <1> 		; OUTPUT: DL = SWP_DRV, EAX = 0 -> OK
   992                              <1> 		;
   993                              <1> 		;    AX = 0 -> ESI = Logical Dos Drv Desc. Table
   994                              <1> 		;
   995                              <1> 		;    EAX, EBX, ECX, EDX, ESI, EDI will be changed
   996                              <1> 		;
   997                              <1> 
   998                              <1>   
   999 0000F5C3 31C0                <1> 		xor	eax, eax
  1000 0000F5C5 48                  <1> 		dec	eax 
  1001                              <1> 
  1002 0000F5C6 668B15[9E4F0100]    <1> 		mov	dx, [SWP_DRV]
  1003 0000F5CD 08F6                <1> 		or	dh, dh
  1004 0000F5CF 742E                <1> 		jz	short loc_rwp_return
  1005                              <1> 
  1006 0000F5D1 3A15[A6420100]      <1> 		cmp	dl, [Current_Drv]
  1007 0000F5D7 7407                <1> 		je	short loc_rwp_restore_cdir
  1008                              <1> loc_rwp_restore_cdrv:
  1009 0000F5D9 E8DF75FFFF          <1> 		call	change_current_drive 
  1010 0000F5DE EB10                <1> 		jmp	short loc_rwp_restore_ok
  1011                              <1> loc_rwp_restore_cdir:
  1012 0000F5E0 31DB                <1> 		xor	ebx, ebx
  1013 0000F5E2 88D7                <1> 		mov	bh, dl
  1014 0000F5E4 BE00010900          <1> 		mov	esi, Logical_DOSDisks
  1015 0000F5E9 01DE                <1> 		add	esi, ebx
  1016                              <1> 
  1017 0000F5EB E88476FFFF          <1> 		call	restore_current_directory
  1018                              <1> 
  1019                              <1> loc_rwp_restore_ok:
  1020 0000F5F0 668B15[9E4F0100]    <1> 		mov	dx, [SWP_DRV]
  1021 0000F5F7 31C0                <1> 		xor	eax, eax  
  1022 0000F5F9 66A3[9F4F0100]      <1> 		mov	[SWP_DRV_chg], ax
  1023                              <1> loc_rwp_return:
  1024 0000F5FF C3                  <1> 		retn
  1025                              <1> 
  1026                              <1> get_file_name:
  1027                              <1> 		; 15/10/2016 - TRDOS 386 (TRDOS v2.0)
  1028                              <1> 		; Convert file name 
  1029                              <1> 		;	from directory entry format
  1030                              <1>                 ; 	to (8.3) dot file name format 
  1031                              <1> 		;
  1032                              <1> 		; TRDOS v1.0 (DIR.ASM, "get_file_name")
  1033                              <1>                 ; 2005 - 09/10/2011 	
  1034                              <1> 		; INPUT: 
  1035                              <1> 		;	DS:SI -> Directory Entry Format File Name
  1036                              <1> 		;       ES:DI -> DOS Dot File Name Address
  1037                              <1> 		; OUTPUT:
  1038                              <1> 		;	DS:SI -> DOS Dot File Name Address
  1039                              <1>                 ;	ES:DI -> Directory Entry Format File Name
  1040                              <1> 		;	
  1041                              <1> 		; TRDOS 386 (15/10/2016)
  1042                              <1> 		; INPUT:
  1043                              <1> 		;	ESI = File name addr in dir entry format
  1044                              <1> 		;	EDI = Dot file name address (destination)
  1045                              <1> 		; OUTPUT: 
  1046                              <1> 		;	File name is converted and moved
  1047                              <1> 		;	to destination (as 8.3 dot filename)
  1048                              <1> 		;  
  1049                              <1> 		; Modified registers: EAX, ECX
  1050                              <1> 
  1051                              <1>                 ; 2005 (TRDOS 8086) - 2016 (TRDOS 386)
  1052                              <1>                             
  1053 0000F600 57                  <1> 		push	edi
  1054 0000F601 56                  <1> 		push	esi
  1055 0000F602 AC                  <1> 		lodsb
  1056 0000F603 3C20                <1> 		cmp	al, 20h
  1057 0000F605 762A                <1> 		jna	short pass_gfn_ext
  1058 0000F607 56                  <1> 		push	esi
  1059 0000F608 AA                  <1> 		stosb
  1060 0000F609 B907000000          <1> 		mov	ecx, 7
  1061                              <1> loc_gfn_next_char:
  1062 0000F60E AC                  <1> 		lodsb
  1063 0000F60F 3C20                <1> 		cmp	al, 20h
  1064 0000F611 7603                <1> 		jna	short pass_gfn_fn
  1065 0000F613 AA                  <1> 		stosb
  1066 0000F614 E2F8                <1> 		loop	loc_gfn_next_char
  1067                              <1> pass_gfn_fn:
  1068 0000F616 5E                  <1> 		pop	esi
  1069 0000F617 83C607              <1> 		add	esi, 7
  1070 0000F61A AC                  <1> 		lodsb
  1071 0000F61B 3C20                <1> 		cmp	al, 20h
  1072 0000F61D 7612                <1> 		jna	short pass_gfn_ext
  1073 0000F61F B42E                <1> 		mov	ah, '.'
  1074 0000F621 86E0                <1> 		xchg	ah, al
  1075 0000F623 66AB                <1> 		stosw
  1076 0000F625 AC                  <1> 		lodsb
  1077 0000F626 3C20                <1> 		cmp	al, 20h
  1078 0000F628 7607                <1> 		jna	short pass_gfn_ext
  1079 0000F62A AA                  <1> 		stosb
  1080 0000F62B AC                  <1> 		lodsb
  1081 0000F62C 3C20                <1> 		cmp	al, 20h
  1082 0000F62E 7601                <1> 		jna	short pass_gfn_ext
  1083 0000F630 AA                  <1> 		stosb
  1084                              <1> pass_gfn_ext:		
  1085 0000F631 30C0                <1> 		xor	al, al
  1086 0000F633 AA                  <1> 		stosb
  1087 0000F634 5E                  <1> 		pop	esi
  1088 0000F635 5F                  <1> 		pop	edi
  1089 0000F636 C3                  <1> 		retn
  1090                              <1> 
  1091                              <1> 
  1092                              <1> set_hardware_int_vector:
  1093                              <1> 		; 18/03/2017
  1094                              <1> 		; 03/03/2017
  1095                              <1> 		; 28/02/2017 - TRDOS 386 (TRDOS v2.0)
  1096                              <1> 		;
  1097                              <1> 		; SET/RESET HARDWARE INTERRUPT GATE
  1098                              <1> 		;
  1099                              <1> 		; Changes interrupt gate descriptor table
  1100                              <1> 		; (without changing default interrupt list)
  1101                              <1> 		;
  1102                              <1> 		; INPUT:
  1103                              <1> 		;	AL = IRQ number (0 to 15)
  1104                              <1> 		;	AH > 0 -> set
  1105                              <1> 		;	AH = 0 -> reset
  1106                              <1> 		;	
  1107                              <1> 		; Modified registers: eax, ebx, edx, edi 
  1108                              <1> 		;
  1109                              <1> 		
  1110 0000F637 C0E002              <1> 		shl	al, 2 ; IRQ number * 4
  1111 0000F63A 0FB6D8              <1> 		movzx	ebx, al
  1112                              <1> 
  1113 0000F63D 08E4                <1> 		or	ah, ah
  1114 0000F63F 7508                <1> 		jnz	short shintv_1 ; set (for user call service)
  1115                              <1> 		
  1116                              <1> 		; 18/03/2017
  1117 0000F641 81C3[B0080100]      <1> 		add	ebx, IRQ_list ; reset to default interrupt list
  1118 0000F647 EB06                <1> 		jmp	short shintv_2
  1119                              <1> shintv_1:
  1120 0000F649 81C3[70F60000]      <1> 		add	ebx, IRQ_u_list
  1121                              <1> shintv_2:	
  1122 0000F64F 8B13                <1> 		mov	edx, [ebx] ; IRQ handler address
  1123                              <1> 		
  1124                              <1> 		; 03/03/2017
  1125 0000F651 D0E0                <1> 		shl	al, 1 ; IRQ number * 8 
  1126                              <1> 		; 18/03/2017
  1127 0000F653 0FB6F8              <1> 		movzx	edi, al 
  1128 0000F656 81C7[F83F0100]      <1> 		add	edi, idt + (8*32) ; IRQ 0 offset = idt + 128 
  1129                              <1> 		
  1130 0000F65C 89D0                <1> 		mov	eax, edx ; IRQ handler address
  1131 0000F65E BB00000800          <1> 		mov	ebx, 80000h
  1132                              <1> 
  1133                              <1> 		;mov	edx, eax
  1134 0000F663 66BA008E            <1> 		mov	dx, 8E00h
  1135 0000F667 6689C3              <1> 		mov	bx, ax
  1136 0000F66A 89D8                <1> 		mov	eax, ebx ; /* selector = 0x0008 = cs */
  1137                              <1>        			         ; /* interrupt gate - dpl=0, present */
  1138 0000F66C AB                  <1> 		stosd	; selector & offset bits 0-15 	
  1139 0000F66D 8917                <1> 		mov	[edi], edx ; attributes & offset bits 16-23
  1140                              <1> 
  1141 0000F66F C3                  <1> 		retn
  1142                              <1> IRQ_u_list:
  1143                              <1> 		; 28/02/2017
  1144 0000F670 [8B060000]          <1> 		dd	timer_int
  1145 0000F674 [FF0D0000]          <1> 		dd	kb_int
  1146 0000F678 [6D080000]          <1> 		dd	irq2
  1147 0000F67C [B0F60000]          <1> 		dd	IRQ_service3
  1148 0000F680 [BAF60000]          <1> 		dd	IRQ_service4
  1149 0000F684 [C4F60000]          <1> 		dd	IRQ_service5
  1150 0000F688 [B0410000]          <1> 		dd	fdc_int	
  1151 0000F68C [CEF60000]          <1> 		dd	IRQ_service7
  1152 0000F690 [F6070000]          <1> 		dd	rtc_int
  1153 0000F694 [D8F60000]          <1> 		dd	IRQ_service9
  1154 0000F698 [E2F60000]          <1> 		dd	IRQ_service10
  1155 0000F69C [ECF60000]          <1> 		dd	IRQ_service11
  1156 0000F6A0 [F6F60000]          <1> 		dd	IRQ_service12
  1157 0000F6A4 [00F70000]          <1> 		dd	IRQ_service13
  1158 0000F6A8 [2C4B0000]          <1> 		dd	hdc1_int
  1159 0000F6AC [534B0000]          <1> 		dd	hdc2_int
  1160                              <1> 
  1161                              <1> 		; 03/03/2017
  1162                              <1> 		; 27/02/2017
  1163                              <1> IRQ_service3:
  1164 0000F6B0 36C605[62550100]03  <1> 		mov	byte [ss:IRQnum], 3
  1165 0000F6B8 EB4E                <1> 		jmp	short IRQ_service
  1166                              <1> IRQ_service4:
  1167 0000F6BA 36C605[62550100]04  <1> 		mov	byte [ss:IRQnum], 4
  1168 0000F6C2 EB44                <1> 		jmp	short IRQ_service
  1169                              <1> IRQ_service5:
  1170 0000F6C4 36C605[62550100]05  <1> 		mov	byte [ss:IRQnum], 5
  1171 0000F6CC EB3A                <1> 		jmp	short IRQ_service
  1172                              <1> IRQ_service7:
  1173 0000F6CE 36C605[62550100]07  <1> 		mov	byte [ss:IRQnum], 7
  1174 0000F6D6 EB30                <1> 		jmp	short IRQ_service
  1175                              <1> IRQ_service9:
  1176 0000F6D8 36C605[62550100]09  <1> 		mov	byte [ss:IRQnum], 9
  1177 0000F6E0 EB26                <1> 		jmp	short IRQ_service
  1178                              <1> IRQ_service10:
  1179 0000F6E2 36C605[62550100]0A  <1> 		mov	byte [ss:IRQnum], 10
  1180 0000F6EA EB1C                <1> 		jmp	short IRQ_service
  1181                              <1> IRQ_service11:
  1182 0000F6EC 36C605[62550100]0B  <1> 		mov	byte [ss:IRQnum], 11
  1183 0000F6F4 EB12                <1> 		jmp	short IRQ_service
  1184                              <1> IRQ_service12:
  1185 0000F6F6 36C605[62550100]0C  <1> 		mov	byte [ss:IRQnum], 12
  1186 0000F6FE EB08                <1> 		jmp	short IRQ_service
  1187                              <1> IRQ_service13:
  1188 0000F700 36C605[62550100]0D  <1> 		mov	byte [ss:IRQnum], 13
  1189                              <1> 		;jmp	short IRQ_service
  1190                              <1> IRQ_service:
  1191                              <1> 		; 04/03/2017
  1192                              <1> 		; 01/03/2017
  1193                              <1> 		; 28/02/2017
  1194                              <1> 		; 27/02/2017
  1195 0000F708 1E                  <1> 		push	ds
  1196 0000F709 06                  <1> 		push	es
  1197 0000F70A 0FA0                <1> 		push	fs
  1198 0000F70C 0FA8                <1> 		push	gs
  1199                              <1> 
  1200 0000F70E 60                  <1> 		pushad	; eax,ecx,edx,ebx,esp,ebp,esi,edi
  1201 0000F70F 66B91000            <1> 		mov     cx, KDATA
  1202 0000F713 8ED9                <1>         	mov     ds, cx
  1203 0000F715 8EC1                <1>         	mov     es, cx
  1204 0000F717 8EE1                <1>         	mov     fs, cx
  1205 0000F719 8EE9                <1>         	mov     gs, cx
  1206                              <1> 
  1207 0000F71B 0F20D8              <1> 		mov	eax, cr3
  1208 0000F71E A3[5E550100]        <1> 		mov	[IRQ_cr3], eax
  1209                              <1> 
  1210 0000F723 A1[E0410100]        <1> 		mov	eax, [k_page_dir]
  1211 0000F728 0F22D8              <1> 		mov	cr3, eax 
  1212                              <1> 
  1213 0000F72B A0[62550100]        <1> 		mov	al, [IRQnum]
  1214                              <1> 
  1215                              <1> 		;mov	cl, [sysflg]
  1216                              <1> 		;mov	[u.r_mode], cl  ; system (0) or user mode (FFh) 
  1217                              <1> IRQsrv_0:
  1218 0000F730 0FB6D8              <1> 		movzx	ebx, al
  1219 0000F733 8A9B[18080100]      <1> 		mov	bl, [ebx+IRQenum] ; IRQ (available) index number + 1
  1220                              <1> 		; 01/03/2017
  1221 0000F739 FECB                <1> 		dec	bl  ; IRQ index number, 0 to 8
  1222 0000F73B 0F8807010000        <1> 		js	IRQsrv_5 ; not available to use here!?
  1223                              <1> 		;		 
  1224 0000F741 80BB[28550100]80    <1> 		cmp	byte [ebx+IRQ.method], 80h ; using by a dev or kernel? 
  1225 0000F748 7205                <1> 		jb	short IRQsrv_1 ; no
  1226                              <1> 
  1227                              <1> 		; If the IRQ service is already owned by TRDOS 386 kernel
  1228                              <1> 		;	 or a Device driver
  1229                              <1> 		; we need to call 'dev_IRQ_service'
  1230                              <1> 
  1231                              <1> 		; IRQ number in AL
  1232 0000F74A E868020000          <1> 		call	dev_IRQ_service	 ; IRQ service for device drivers	
  1233                              <1> 		; IRQ number in AL
  1234                              <1> IRQsrv_1:		
  1235                              <1> 		; check user callback service status
  1236                              <1> 		; AL = IRQ number
  1237                              <1> 		; EBX = IRQ (Available) Index number
  1238                              <1> 
  1239 0000F74F A2[735D0100]        <1> 		mov	[u.irqwait], al ; set waiting IRQ flag
  1240                              <1> 
  1241 0000F754 8A83[16550100]      <1> 		mov	al, [ebx+IRQ.owner]
  1242 0000F75A 20C0                <1> 		and	al, al
  1243 0000F75C 0F84E6000000        <1> 		jz	IRQsrv_5 ; it is not owned by a user/proc
  1244                              <1> 
  1245                              <1> 		; 03/03/2017
  1246 0000F762 89DA                <1> 		mov	edx, ebx
  1247 0000F764 C0E202              <1> 		shl	dl,2
  1248 0000F767 8B92[3A550100]      <1> 		mov	edx, [edx+IRQ.addr] ; S.R.B. or Callback service addr
  1249                              <1> 		
  1250 0000F76D 8AA3[28550100]      <1> 		mov	ah, [ebx+IRQ.method]
  1251 0000F773 F6C401              <1> 		test	ah, 1
  1252 0000F776 7534                <1> 		jnz	short IRQsrv_4 ; Callback service method
  1253                              <1> 
  1254                              <1> 		; Signal Response Byte method
  1255                              <1> 		;mov	edx, [edx+IRQ.addr] ; Signal Response Byte address
  1256                              <1> 		;			    ; (Physical address, non-swappable) 	
  1257 0000F778 80E402              <1> 		and	ah, 2 ; bit 1, (S.R.B.) counter (auto increment) method
  1258 0000F77B 8AA3[31550100]      <1> 		mov	ah, [ebx+IRQ.srb] ; Signal Response Byte value
  1259 0000F781 7408                <1> 		jz	short IRQsrv_2 ; fixed S.R.B. value
  1260                              <1> 		; counter method (auto increment)
  1261 0000F783 FEC4                <1> 		inc	ah
  1262 0000F785 88A3[31550100]      <1> 		mov	[ebx+IRQ.srb], ah ; next (count) number
  1263                              <1> IRQsrv_2:
  1264 0000F78B 8822                <1> 		mov	[edx], ah ; put S.R.B. val to the user's S.R.B. addr
  1265 0000F78D C605[735D0100]00    <1> 		mov	byte [u.irqwait], 0 ; clear waiting IRQ flag
  1266                              <1> 
  1267 0000F794 3A05[4F5D0100]      <1> 		cmp	al, [u.uno]
  1268 0000F79A 0F84A8000000        <1> 		je	IRQsrv_5 ; the owner is current user/process
  1269                              <1> IRQsrv_3:
  1270                              <1> 		; the owner is not current user/process
  1271                              <1> 		; AL = process number
  1272 0000F7A0 B202                <1> 		mov	dl, 2 ; priority, 2 = event (high)	
  1273 0000F7A2 E855FAFFFF          <1> 		call	set_run_sequence
  1274                              <1> 
  1275                              <1> 		; [u.irqwait] = waiting IRQ number for callback service
  1276                              <1> 
  1277 0000F7A7 E99C000000          <1> 		jmp	IRQsrv_5
  1278                              <1> IRQsrv_4:
  1279 0000F7AC 3A05[4F5D0100]      <1> 		cmp	al, [u.uno]
  1280 0000F7B2 75EC                <1> 		jne	short IRQsrv_3 ; the owner is current user/process
  1281                              <1> 
  1282                              <1> 		; Check if an IRQ callback service already in progress
  1283 0000F7B4 803D[745D0100]00    <1> 		cmp	byte [u.r_lock], 0
  1284 0000F7BB 0F8787000000        <1> 		ja	IRQsrv_5 ; nothing to do !  
  1285                              <1> 				     ; (we need to complete prev callback)
  1286                              <1> 
  1287 0000F7C1 803D[705D0100]00    <1> 		cmp	byte [u.t_lock], 0
  1288 0000F7C8 777E                <1> 		ja	short IRQsrv_5 ; nothing to do !  
  1289                              <1> 				     ; (we need to complete timer callback)
  1290                              <1> 
  1291                              <1> 		; 04/03/2017
  1292 0000F7CA C605[735D0100]00    <1> 		mov	byte [u.irqwait], 0 ; reset/clear waiting IRQ flag
  1293                              <1> 
  1294 0000F7D1 FE05[745D0100]      <1> 		inc	byte [u.r_lock] ; 'IRQ callback service in progress' flag
  1295                              <1> 
  1296 0000F7D7 8A0D[F75C0100]      <1> 		mov	cl, [sysflg]   ; (system call) mode flag (kernel/user)
  1297 0000F7DD 880D[755D0100]      <1> 		mov	[u.r_mode], cl ; system mode (0) or user mode (FFh)
  1298                              <1> 
  1299                              <1> 		; 
  1300 0000F7E3 8B2D[7C410100]      <1> 		mov	ebp, [tss.esp0] ; kernel stack address (for ring 0)
  1301 0000F7E9 83ED14              <1> 		sub	ebp, 20		; eip, cs, eflags, esp, ss
  1302 0000F7EC 892D[F85C0100]      <1> 	 	mov	[u.sp], ebp
  1303 0000F7F2 8925[FC5C0100]      <1> 		mov	[u.usp], esp
  1304                              <1> 
  1305                              <1> 		;or	word [ebp+8], 200h ; 22/01/2017, force enabling interrupts
  1306                              <1> 
  1307 0000F7F8 8B44241C            <1> 		mov	eax, [esp+28] ; pushed eax
  1308 0000F7FC A3[005D0100]        <1> 		mov	[u.r0], eax
  1309                              <1> 
  1310 0000F801 E86BEEFFFF          <1> 		call	wswap ; save user's registers & status
  1311                              <1> 
  1312                              <1> 		; software int is in ring 0 but IRQ handler must return to ring 3
  1313                              <1> 		; so, ring 3 return address and stack registers
  1314                              <1> 		; (eip, cs, eflags, esp, ss) 
  1315                              <1> 		; must be copied to IRQ handler return
  1316                              <1> 		; eip will be replaced by callback service routine address
  1317                              <1> 
  1318 0000F806 C605[F75C0100]FF    <1> 		mov	byte [sysflg], 0FFh ; user mode
  1319                              <1> 
  1320                              <1> 		; system mode (system call)
  1321                              <1> 		;mov	ebp, [u.sp] ; EIP (u), CS (UCODE), EFLAGS (u),
  1322                              <1> 				    ; ESP (u), SS (UDATA)
  1323                              <1> 
  1324 0000F80D 8B4510              <1> 		mov	eax, [ebp+16]	; SS (UDATA)
  1325 0000F810 89E6                <1> 		mov	esi, esp
  1326 0000F812 50                  <1> 		push	eax
  1327 0000F813 50                  <1> 		push	eax
  1328 0000F814 89E7                <1> 		mov	edi, esp
  1329 0000F816 893D[FC5C0100]      <1> 		mov	[u.usp], edi
  1330 0000F81C B908000000          <1> 		mov	ecx, ((ESPACE/4) - 4) ; except DS, ES, FS, GS
  1331 0000F821 F3A5                <1> 		rep	movsd
  1332 0000F823 B104                <1> 		mov	cl, 4	
  1333 0000F825 F3AB                <1> 		rep	stosd
  1334 0000F827 893D[F85C0100]      <1> 		mov	[u.sp], edi
  1335 0000F82D 89EE                <1> 		mov	esi, ebp
  1336 0000F82F B105                <1> 		mov	cl, 5 ; EIP (u), CS (UCODE), EFLAGS (u), ESP (u), SS (UDATA)
  1337 0000F831 F3A5                <1> 		rep	movsd
  1338                              <1> 		;
  1339                              <1> 
  1340 0000F833 8B0D[545D0100]      <1> 		mov	ecx, [u.pgdir]
  1341 0000F839 890D[5E550100]      <1> 		mov	[IRQ_cr3], ecx
  1342                              <1> 
  1343                              <1> set_IRQ_callback_addr:
  1344                              <1> 		;
  1345                              <1> 		; This routine sets return address
  1346                              <1> 		; to start of user's interrupt
  1347                              <1> 		; service (callback) address
  1348                              <1> 		;
  1349                              <1> 		; INPUT:
  1350                              <1> 		;	EDX = callback routine/service address
  1351                              <1> 		;	      (virtual, not physical address!)	
  1352                              <1> 		;	[u.sp] = kernel stack, points to
  1353                              <1> 		;		 user's EIP,CS,EFLAGS,ESP,SS
  1354                              <1> 		;		 registers.
  1355                              <1> 		; OUTPUT:
  1356                              <1> 		;	EIP (user) = callback (service) address
  1357                              <1> 		;	CS (user) = UCODE
  1358                              <1> 		;	EFLAGS (user) = flags before callback 	 
  1359                              <1> 		;       ESP (user) = ESP-4 (user, before callback) 
  1360                              <1> 		;	[ESP](user) = EIP (user) before callback
  1361                              <1> 		;
  1362                              <1> 		; Note: If CPU was in user mode while entering 
  1363                              <1> 		;	the timer interrupt service routine,
  1364                              <1> 		;	'IRET' will get return to callback routine
  1365                              <1> 		;	immediately. If CPU was in system/kernel mode  
  1366                              <1> 		;	'iret' will get return to system call and
  1367                              <1> 		;	then, callback routine will be return address
  1368                              <1> 		;	from system call. (User's callback/service code
  1369                              <1> 		;	will be able to return to normal return address
  1370                              <1> 		;	via a 'sysrele' system call at the end.) 
  1371                              <1> 		;
  1372                              <1> 		; Note: User's IRQ callback service code must be ended
  1373                              <1> 		;	with a 'sysrele' system call !
  1374                              <1> 		;
  1375                              <1> 		;	For example:
  1376                              <1> 		;
  1377                              <1> 		;	audio_IRQ_callback:
  1378                              <1> 		;	    ...	 
  1379                              <1> 		;	    <load DMA buffer with audio data>
  1380                              <1> 		;	    ...
  1381                              <1> 		;	    mov eax, 39 ; 'sysrele'
  1382                              <1> 		;	    int 40h ; TRDOS 386 system call (interrupt)		
  1383                              <1> 		;
  1384                              <1> 		
  1385                              <1> 		;mov	edx, [edx+IRQ.addr] ; Callback service address
  1386                              <1> 		;			    ; (Virtual address)
  1387                              <1> 		
  1388 0000F83F 8B2D[F85C0100]      <1> 		mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
  1389 0000F845 895500              <1> 		mov	[ebp], edx
  1390                              <1> IRQsrv_5:
  1391                              <1> 		; EOI & return
  1392 0000F848 803D[62550100]07    <1> 		cmp	byte [IRQnum], 7	
  1393 0000F84F 7604                <1> 		jna	short IRQsrv_6
  1394                              <1> 		;	
  1395 0000F851 B020                <1> 		mov	al, EOI	; end of interrupt
  1396                              <1> 		;cli		; disable interrupts till stack cleared
  1397 0000F853 E6A0                <1> 		out	INTB00, al ; For controll2 #2
  1398                              <1> IRQsrv_6:
  1399                              <1> 		;mov	byte [IRQnum], 0 ; reset
  1400 0000F855 B020                <1> 		mov	al, EOI	; end of interrupt
  1401 0000F857 FA                  <1> 		cli		; disable interrupts till stack cleared
  1402 0000F858 E620                <1> 		out	INTA00, al ; end of interrupt to 8259 - 1	
  1403                              <1> IRQsrv_7:	
  1404 0000F85A 8B0D[5E550100]      <1> 		mov 	ecx, [IRQ_cr3]	; previous content of cr3 register
  1405 0000F860 0F22D9              <1>  		mov	cr3, ecx	; restore cr3 register content
  1406                              <1> 		;
  1407 0000F863 61                  <1> 		popad ; edi,esi,ebp,(icrement esp by 4), ebx,edx,ecx,eax
  1408                              <1> 		;
  1409 0000F864 0FA9                <1> 		pop	gs
  1410 0000F866 0FA1                <1> 		pop	fs
  1411 0000F868 07                  <1> 		pop	es
  1412 0000F869 1F                  <1> 		pop	ds
  1413                              <1> 		;
  1414 0000F86A CF                  <1> 		iretd	; return from interrupt
  1415                              <1> 
  1416                              <1> get_device_number:
  1417                              <1> 		; 08/10/2016
  1418                              <1> 		; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1419                              <1> 		;
  1420                              <1> 		; This procedure compares name of requested
  1421                              <1> 		; device with kernel device names and
  1422                              <1> 		; installable device names. If names match, 
  1423                              <1> 		; the relevant device index (entry) number 
  1424                              <1> 		; will be returned the caller (sysopen) 
  1425                              <1> 		; for the requested device.
  1426                              <1> 		;
  1427                              <1> 		; NOTE: Installable device drivers must
  1428                              <1> 		; be loaded before using 'sysopen'
  1429                              <1> 		; (opendev) system call.
  1430                              <1> 		;
  1431                              <1> 		; INPUT:
  1432                              <1> 		;    ESI = device name address (ASCIIZ)
  1433                              <1> 		;         (in kernel's memory space)  
  1434                              <1>    		;    max name length = 8 without '/dev/')
  1435                              <1> 		;    Device name will be capitalized 
  1436                              <1> 		;    and if there is, '/dev/' will be
  1437                              <1> 		;    removed from name before comparising)
  1438                              <1> 		;
  1439                              <1> 		; OUTPUT:
  1440                              <1> 		;    cf = 0 -> 
  1441                              <1> 		;      EAX (AL) = device entry/index number 	 	
  1442                              <1> 		;    cf = 1 -> device not found (installed)
  1443                              <1> 		;	       or invalid device name
  1444                              <1> 		;	       (AL=0)
  1445                              <1> 		;    device_name = device name address (asciiz)
  1446                              <1> 			;
  1447                              <1> 		; Modified registers: EAX, EBX, ESI, EDI
  1448                              <1> 
  1449 0000F86B BF[A14F0100]        <1> 		mov	edi, device_name
  1450 0000F870 E805010000          <1> 		call 	lodsb_capitalize
  1451 0000F875 88C4                <1> 		mov	ah, al
  1452 0000F877 3C2F                <1> 		cmp	al, '/'
  1453 0000F879 750E                <1> 		jne	short gdn_1
  1454 0000F87B BF[A14F0100]        <1> 		mov	edi, device_name
  1455 0000F880 E8F5000000          <1> 		call 	lodsb_capitalize
  1456                              <1> gdn_0:
  1457 0000F885 20C0                <1> 		and	al, al ; 0 ?
  1458 0000F887 7420                <1> 		jz	short gdn_err ; null name after '/'
  1459                              <1> gdn_1:
  1460 0000F889 3C44                <1> 		cmp	al, 'D'
  1461 0000F88B 7517                <1> 		jne	short gdn_2
  1462 0000F88D E8E8000000          <1> 		call 	lodsb_capitalize
  1463 0000F892 3C45                <1> 		cmp	al, 'E'
  1464 0000F894 750E                <1> 		jne	short gdn_2
  1465 0000F896 E8DF000000          <1> 		call 	lodsb_capitalize
  1466 0000F89B 3C56                <1> 		cmp	al, 'V'
  1467 0000F89D 7505                <1> 		jne	short gdn_2			
  1468 0000F89F AC                  <1> 		lodsb
  1469 0000F8A0 3C2F                <1> 		cmp	al, '/'
  1470 0000F8A2 740D                <1> 		je	short gdn_4
  1471                              <1> gdn_2:
  1472 0000F8A4 80FC2F              <1> 		cmp	ah, '/'
  1473 0000F8A7 750F                <1> 		jne	short gdn_5
  1474                              <1> gdn_err:		
  1475                              <1> 		; invalid device name or device not found
  1476 0000F8A9 31C0                <1> 		xor	eax, eax ; 0
  1477 0000F8AB F9                  <1> 		stc
  1478 0000F8AC C3                  <1> 		retn
  1479                              <1> gdn_3:
  1480 0000F8AD 3C2F                <1> 		cmp	al, '/'
  1481 0000F8AF 7507                <1> 		jne	short gdn_5
  1482                              <1> gdn_4:
  1483 0000F8B1 BF[A14F0100]        <1> 		mov	edi, device_name
  1484 0000F8B6 EB04                <1> 		jmp	short gdn_6
  1485                              <1> gdn_5:
  1486 0000F8B8 3C00                <1> 		cmp	al, 0
  1487 0000F8BA 7419                <1> 		je	short gdn_7
  1488                              <1> gdn_6:
  1489 0000F8BC E8B9000000          <1> 		call lodsb_capitalize
  1490 0000F8C1 81FF[A94F0100]      <1> 		cmp	edi, device_name + 8
  1491 0000F8C7 72E4                <1> 		jb	short gdn_3
  1492 0000F8C9 3C00                <1> 		cmp	al, 0
  1493 0000F8CB 75DC                <1> 		jne	short gdn_err
  1494 0000F8CD 81FF[A24F0100]      <1> 		cmp	edi, device_name + 1
  1495 0000F8D3 76D4                <1> 		jna	short gdn_err ; null name after '/'
  1496                              <1> gdn_7:
  1497 0000F8D5 AA                  <1> 		stosb
  1498                              <1> 		; zero padding ("NAME",0,0,0,0)
  1499 0000F8D6 81FF[A94F0100]      <1> 		cmp	edi, device_name + 8
  1500 0000F8DC 72F7                <1> 		jb	short gdn_7
  1501                              <1> gdn_8:
  1502                              <1> 		; search for kernel device names
  1503 0000F8DE BE[A14F0100]        <1> 		mov	esi, device_name 
  1504 0000F8E3 BF[FE050100]        <1> 		mov	edi, KDEV_NAME
  1505 0000F8E8 31C0                <1> 		xor	eax, eax
  1506                              <1> gdn_9:
  1507 0000F8EA A7                  <1> 		cmpsd	
  1508 0000F8EB 7505                <1> 		jne	short gdn_10
  1509 0000F8ED A7                  <1> 		cmpsd
  1510 0000F8EE 7503                <1> 		jne	short gdn_11
  1511 0000F8F0 EB2B                <1> 		jmp	short gdn_17 ; match
  1512                              <1> gdn_10:
  1513 0000F8F2 A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1514                              <1> gdn_11:
  1515 0000F8F3 BE[A14F0100]        <1> 		mov	esi, device_name
  1516 0000F8F8 FEC0                <1> 		inc	al
  1517 0000F8FA 3C16                <1> 		cmp	al, NumOfKernelDevNames
  1518 0000F8FC 72EC                <1> 		jb	short gdn_9
  1519                              <1> gdn_12:
  1520                              <1> 		; search for installable device names
  1521                              <1> 		; esi = offset device_name 
  1522 0000F8FE BF[CC4F0100]        <1> 		mov	edi, IDEV_NAME
  1523 0000F903 28C0                <1> 		sub	al, al ; 0
  1524                              <1> gdn_13:
  1525 0000F905 A7                  <1> 		cmpsd	
  1526 0000F906 7505                <1> 		jne	short gdn_14
  1527 0000F908 A7                  <1> 		cmpsd
  1528 0000F909 7503                <1> 		jne	short gdn_15
  1529 0000F90B EB3F                <1> 		jmp	short gdn_19 ; match
  1530                              <1> gdn_14:
  1531 0000F90D A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1532                              <1> gdn_15:
  1533 0000F90E BE[A14F0100]        <1> 		mov	esi, device_name
  1534 0000F913 FEC0                <1> 		inc	al
  1535 0000F915 3C08                <1> 		cmp	al, NumOfInstallableDevices
  1536 0000F917 72EC                <1> 		jb	short gdn_13
  1537                              <1> 
  1538                              <1> gdn_16: 	; error: invalid device name (not found) !
  1539 0000F919 30C0                <1> 		xor	al, al
  1540 0000F91B F9                  <1> 		stc
  1541 0000F91C C3                  <1> 		retn
  1542                              <1> 
  1543                              <1> gdn_17:		; name match (with one of kernel device names)
  1544                              <1> 		;
  1545                              <1> 		; convert KDEV_NAME index to 
  1546                              <1> 		; KDEV_NUMBER index
  1547                              <1> 		; (different names are used for same devices)
  1548                              <1> 		; (example: "COM1" & "TTY8" = device number 18) 
  1549 0000F91D 89C3                <1> 		mov	ebx, eax ; < 256
  1550 0000F91F 8A83[AE060100]      <1> 		mov	al, [KDEV_NUMBER+ebx]
  1551                              <1> 
  1552                              <1> 		; check if empty dev entry in the list
  1553 0000F925 80B8[50510100]00    <1> 		cmp	byte [DEV_OPENMODE+eax], 0
  1554 0000F92C 771B                <1> 		ja	short gdn_18 ; it must be already set
  1555                              <1> 
  1556                              <1> 		; (re)set device name and access flags
  1557                              <1> 		; (remain open work will be easy after that)
  1558                              <1> 		; (NOTE: here, data will be copied to bss section)
  1559 0000F92E 88C3                <1> 		mov	bl, al
  1560 0000F930 83EF08              <1> 		sub	edi, 8 ; kernel device name address (data)
  1561 0000F933 66C1E302            <1> 		shl	bx, 2 
  1562 0000F937 89BB[6E510100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1563 0000F93D 8A98[04080100]      <1> 		mov	bl, [KDEV_ACCESS+eax] ; kernel dev list (data)
  1564 0000F943 8898[9C500100]      <1> 		mov	[DEV_ACCESS+eax], bl ; (all) device list (bss)
  1565                              <1> gdn_18:
  1566 0000F949 FEC0                <1> 		inc	al ; 1 to NumOfKernelDevNames (<=7Fh)
  1567                              <1> 		; eax = device index/entry number
  1568 0000F94B C3                  <1> 		retn		
  1569                              <1> 
  1570                              <1> gdn_19:		; name match (with one of installable device names)
  1571                              <1> 		;
  1572                              <1> 		; al = 0 to NumOfInstallableDevices - 1 (<=7Fh)
  1573                              <1> 
  1574 0000F94C 89C3                <1> 		mov	ebx, eax
  1575 0000F94E 80C316              <1> 		add	bl, NumOfKernelDevices 	; < NUMOFDEVICES	
  1576                              <1> 
  1577                              <1> 		; check if empty dev entry in the list
  1578 0000F951 80BB[50510100]00    <1> 		cmp	byte [DEV_OPENMODE+ebx], 0
  1579 0000F958 771D                <1> 		ja	short gdn_20 ; it must be already set
  1580                              <1> 
  1581                              <1> 		; (re)set device name and access flags
  1582                              <1> 		; (remain open work will be easy after that)
  1583 0000F95A 83EF08              <1> 		sub	edi, 8 ; installable device name address
  1584 0000F95D 66C1E302            <1> 		shl	bx, 2 ;*4
  1585 0000F961 89BB[6E510100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1586 0000F967 66C1EB02            <1> 		shr	bx, 2
  1587 0000F96B 8A80[14500100]      <1> 		mov	al, [IDEV_FLAGS+eax] ; installable dev list
  1588 0000F971 8883[9C500100]      <1> 		mov	[DEV_ACCESS+ebx], al ; (all) device list
  1589                              <1> gdn_20:	
  1590 0000F977 88D8                <1> 		mov	al, bl
  1591                              <1> 		; eax = device index/entry number ; < NUMOFDEVICES  
  1592 0000F979 C3                  <1> 		retn
  1593                              <1> 
  1594                              <1> lodsb_capitalize:
  1595                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1596                              <1> 	; INPUT -> [esi] = character
  1597                              <1> 	;          edi = destination
  1598                              <1> 	; OUTPUT -> AL contains capitalized character
  1599                              <1> 	;	   esi = esi+1
  1600                              <1> 	;	   edi = edi+1	
  1601                              <1> 	; 
  1602 0000F97A AC                  <1> 	lodsb	
  1603 0000F97B 3C61                <1> 	cmp al, 61h
  1604 0000F97D 7206                <1>      	jb  short lodsb_cap_retn
  1605 0000F97F 3C7A                <1>      	cmp al, 7Ah
  1606 0000F981 7702                <1>      	ja  short lodsb_cap_retn
  1607 0000F983 24DF                <1>      	and al, 0DFh
  1608                              <1> lodsb_cap_retn:
  1609 0000F985 AA                  <1> 	stosb
  1610 0000F986 C3                  <1> 	retn
  1611                              <1> 
  1612                              <1> device_open:
  1613                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1614                              <1> 	; Complete device opening work for sysopen (device)
  1615                              <1> 	;
  1616                              <1> 	; INPUT -> 
  1617                              <1> 	;	EAX = Device Number (AL)
  1618                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1619                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1620                              <1> 	; OUTPUT ->
  1621                              <1> 	;	EAX = Device Number	
  1622                              <1> 	;	CF = 0 -> device has been opened
  1623                              <1> 	;	CF = 1 -> device could not be opened
  1624                              <1> 	;
  1625                              <1> 	;  Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1626                              <1> 	;
  1627                              <1> 
  1628 0000F987 89C3                <1> 	mov	ebx, eax
  1629 0000F989 66C1E302            <1> 	shl	bx, 2 ; *4
  1630                              <1> 
  1631 0000F98D F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1632 0000F990 7406                <1> 	jz	short d_open_2 ; Kernel device
  1633                              <1> 	; installable device
  1634                              <1> d_open_1:
  1635 0000F992 FFA3[18500100]      <1>         jmp	dword [ebx+IDEV_OADDR-4]
  1636                              <1> d_open_2:
  1637 0000F998 FFA3[C0060100]      <1> 	jmp	dword [ebx+KDEV_OADDR-4]
  1638                              <1> 
  1639                              <1> device_close:
  1640                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1641                              <1> 	; Complete device closing work for sysclose (device)
  1642                              <1> 	;
  1643                              <1> 	; INPUT -> 
  1644                              <1> 	;	EAX = Device Number (AL)
  1645                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1646                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1647                              <1> 	; OUTPUT ->
  1648                              <1> 	;	EAX = Device Number	
  1649                              <1> 	;	CF = 0 -> device has been closed
  1650                              <1> 	;	CF = 1 -> device could not be closed
  1651                              <1> 	;
  1652                              <1> 	; Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1653                              <1> 	;
  1654                              <1> 
  1655 0000F99E 89C3                <1> 	mov	ebx, eax
  1656 0000F9A0 66C1E302            <1> 	shl	bx, 2 ; *4
  1657                              <1> 
  1658 0000F9A4 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1659 0000F9A7 7406                <1> 	jz	short d_close_2 ; Kernel device
  1660                              <1> 	; installable device
  1661                              <1> d_close_1:
  1662 0000F9A9 FFA3[38500100]      <1>         jmp	dword [ebx+IDEV_CADDR-4]
  1663                              <1> d_close_2:
  1664 0000F9AF FFA3[10070100]      <1> 	jmp	dword [ebx+KDEV_CADDR-4]	
  1665                              <1> 
  1666                              <1> rnull:
  1667                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1668                              <1> 	; read null (read from null device)
  1669 0000F9B5 C3                  <1> 	retn
  1670                              <1> 
  1671                              <1> wnull:
  1672                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1673                              <1> 	; write null (write to null device)
  1674 0000F9B6 C3                  <1> 	retn
  1675                              <1> 
  1676                              <1> dev_IRQ_service:
  1677                              <1> 	; 13/04/2017
  1678                              <1> 	; 27/02/2017 - TRDOS 386 (TRDOS v2.0)
  1679                              <1> 	; INPUT ->
  1680                              <1> 	;	AL = IRQ Number (0 to 15)
  1681                              <1> 	;	
  1682 0000F9B7 53                  <1> 	push	ebx
  1683                              <1> 	;push	eax
  1684 0000F9B8 0FB6D8              <1> 	movzx	ebx, al
  1685 0000F9BB C0E302              <1> 	shl	bl, 2 ; * 4	
  1686 0000F9BE 8B9B[D6540100]      <1> 	mov	ebx, [ebx+DEV_INT_HNDLR]
  1687 0000F9C4 21DB                <1> 	and 	ebx, ebx
  1688 0000F9C6 7402                <1>         jz	short dIRQ_s_retn
  1689 0000F9C8 FFD3                <1> 	call	ebx
  1690                              <1> dIRQ_s_retn:
  1691                              <1> 	;pop	eax
  1692 0000F9CA 5B                  <1> 	pop	ebx
  1693 0000F9CB C3                  <1> 	retn		
  1694                              <1> 
  1695                              <1> 
  1696                              <1> set_dev_IRQ_service:
  1697                              <1> 	; 13/04/2017 - TRDOS 386 (TRDOS v2.0)
  1698                              <1> 	;
  1699                              <1> 	; Set Device Interrupt Service
  1700                              <1> 	;
  1701                              <1> 	; INPUT ->
  1702                              <1> 	;	AL = IRQ Number
  1703                              <1> 	;	EBX = Hardware Interrupt Service Address
  1704                              <1> 	;
  1705                              <1> 	; Note: There is not a validation check here
  1706                              <1> 	;	because this procedure is called by
  1707                              <1> 	;	TRDOS 386 kernel !
  1708                              <1> 	;       (Even if a device driver does not exist
  1709                              <1> 	;	this setting may be used by sysaudio
  1710                              <1> 	;	and other system calls for hardware
  1711                              <1> 	;	components which use IRQ method for I/O.)
  1712                              <1> 	;
  1713                              <1> 	;push	esi
  1714 0000F9CC 0FB6F0              <1> 	movzx	esi, al
  1715 0000F9CF 66C1E602            <1> 	shl	si, 2 ; * 4	
  1716 0000F9D3 899E[D6540100]      <1> 	mov	[esi+DEV_INT_HNDLR], ebx
  1717                              <1> 	;pop	esi
  1718 0000F9D9 C3                  <1> 	retn		
  1719                              <1> 	
  1720                              <1> 
  1721                              <1> sysaudio: ; AUDIO FUNCTIONS
  1722                              <1> 	; 23/04/2017
  1723                              <1> 	; 22/04/2017
  1724                              <1> 	; 21/04/2017
  1725                              <1> 	; 16/04/2017
  1726                              <1> 	; 10/04/2017, 13/04/2017, 14/04/2017
  1727                              <1> 	; 03/04/2017 (VIA VT8237R)
  1728                              <1> 	; 01/04/2016 (trdosk6.s -> tdosk8.s)
  1729                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  1730                              <1> 	;
  1731                              <1> 	; Inputs:
  1732                              <1> 	;
  1733                              <1> 	;	BH = 0 -> Beep (PC Speaker)
  1734                              <1> 	;	     BL = Duration Counter (1 for 1/64 second)
  1735                              <1> 	;	     CX = Frequency Divisor (1193180/Frequency)
  1736                              <1> 	;		 (1331 for 886 Hz)
  1737                              <1> 	;
  1738                              <1> 	;	01/04/2017	
  1739                              <1> 	;
  1740                              <1> 	; 	BH = 1 -> DETECT (& ENABLE) AUDIO DEVICE
  1741                              <1> 	;	     BL = 0 : PC SPEAKER
  1742                              <1> 	;		  1 : SOUND BLASTER 16
  1743                              <1> 	;		  2 : INTEL AC'97
  1744                              <1> 	;		  3 : VIA VT8237R (VT8233)			 				
  1745                              <1> 	;		  4 : INTEL HDA
  1746                              <1> 	;	      5-FEh : unknown/invalid
  1747                              <1> 	;		FFh : Any
  1748                              <1> 	;
  1749                              <1> 	; 	BH = 2 -> ALLOCATE AUDIO BUFFER (for user)
  1750                              <1> 	;		ECX = Audio Buffer Size (must be equal to
  1751                              <1> 	;		      the half of DMA buffer size) 
  1752                              <1> 	;		EDX = Virtual Address of the buffer
  1753                              <1> 	;		      (This is not DMA buffer!)
  1754                              <1> 	;
  1755                              <1> 	;	BH = 3 -> INITIALIZE AUDIO DEVICE
  1756                              <1> 	;	     BL = 0,2 -> for Signal Response Byte	 	
  1757                              <1> 	;	     	CL = Signal Response Byte Value (fixed)
  1758                              <1> 	;				if BL = 0
  1759                              <1> 	;	             auto increment of S.R.B. value
  1760                              <1> 	;			 	if BL = 2
  1761                              <1> 	;	        EDX = Signal Response (Return) Byte Address
  1762                              <1> 	;	     	   			
  1763                              <1> 	;	     BL = 1 for CallBack Method	 	
  1764                              <1> 	;	    	EDX = CallBack Service Address (Virtual)
  1765                              <1> 	;
  1766                              <1> 	;	     BL > 2 -> invalid function	
  1767                              <1> 	;
  1768                              <1> 	;	    (Audio buffer must be allocated before
  1769                              <1> 	;	     initialization.) 		
  1770                              <1> 	;
  1771                              <1> 	;	BH = 4 -> START TO PLAY
  1772                              <1> 	;	     BL = Mode
  1773                              <1> 	;		  Bit 0 = mono/stereo (1 = stereo)		
  1774                              <1> 	;		  Bit 1 = 8 bit / 16 bit (1 = 16 bit)
  1775                              <1> 	;	     CX = Sampling Rate (Hz)
  1776                              <1> 	;
  1777                              <1> 	;	BH = 5 -> PAUSE
  1778                              <1> 	;	     BL = Any
  1779                              <1> 	;
  1780                              <1> 	;	BH = 6 -> CONTINUE TO PLAY
  1781                              <1> 	;	     BL = Any
  1782                              <1> 	;
  1783                              <1> 	;	BH = 7 -> STOP
  1784                              <1> 	;	     BL = Any
  1785                              <1> 	;
  1786                              <1> 	;	BH = 8 -> RESET 
  1787                              <1> 	;	     BL = Any
  1788                              <1> 	;
  1789                              <1> 	;	BH = 9 -> CANCEL (CALLBACK or S.R.B. SERVICE)
  1790                              <1> 	;	     BL = Any	
  1791                              <1> 	;	
  1792                              <1> 	;	BH = 10 -> DEALLOCATE AUDIO BUFFER (for user)
  1793                              <1> 	;	     BL = Any
  1794                              <1> 	;
  1795                              <1> 	;	BH = 11 -> SET VOLUME LEVEL
  1796                              <1> 	;	     BL:
  1797                              <1> 	;		  0 = Master (Playback, Lineout) volume
  1798                              <1> 	;	     CL = Left Channel Volume
  1799                              <1> 	;	     CH = Right Channel Volume
  1800                              <1> 	;
  1801                              <1> 	;	BH = 12 -> DISABLE AUDIO DEVICE
  1802                              <1> 	;	     (reset audio device and unlink dma buffer)	
  1803                              <1> 	;	     BL = Any	  		  	  	
  1804                              <1> 	;	 	
  1805                              <1> 	;
  1806                              <1> 	; Outputs:
  1807                              <1> 	;
  1808                              <1> 	;	For BH = 0 -> Beep
  1809                              <1> 	;	    None
  1810                              <1> 	;
  1811                              <1> 	;	01/04/2017
  1812                              <1> 	;
  1813                              <1> 	; 	For BH = 1 -> DETECT (& ENABLE) AUDIO DEVICE
  1814                              <1> 	;	    AH = 0 : PC SPEAKER
  1815                              <1> 	;		 1 : SOUND BLASTER 16
  1816                              <1> 	;		 2 : INTEL AC'97
  1817                              <1> 	;		 3 : VIA VT8237R (VT8233)			 				
  1818                              <1> 	;		 4 : INTEL HDA
  1819                              <1> 	;	      5-FFh : unknown/invalid
  1820                              <1> 	;	    AL = mode status
  1821                              <1> 	;		 bit 0 = mono /stereo (1 = stereo)
  1822                              <1> 	;		 bit 1 = 8 bit / 16 bit ( 1 = 16 bit)
  1823                              <1> 	;	    EBX = PCI DEVICE ID (if >0)	(BUS/DEV/FN)
  1824                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1825                              <1> 	;
  1826                              <1> 	; 	For BH = 2 -> ALLOCATE AUDIO BUFFER (for user)
  1827                              <1> 	;	    EAX = Physical Address of the buffer
  1828                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1829                              <1> 	;
  1830                              <1> 	;	For BH = 3 -> INITIALIZE AUDIO DEVICE
  1831                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1832                              <1> 	;
  1833                              <1> 	;	For BH = 4 -> START TO PLAY
  1834                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1835                              <1> 	;
  1836                              <1> 	;	For BH = 5 -> PAUSE
  1837                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1838                              <1> 	;
  1839                              <1> 	;	For BH = 6 -> CONTINUE TO PLAY
  1840                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1841                              <1> 	;
  1842                              <1> 	;	For BH = 7 -> STOP
  1843                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1844                              <1> 	;
  1845                              <1> 	;	For BH = 8 -> RESET 
  1846                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1847                              <1> 	;
  1848                              <1> 	;	For BH = 9 -> CANCEL (CALLBACK or S.R.B. SERVICE)
  1849                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1850                              <1> 	;	
  1851                              <1> 	;	For BH = 10 -> DEALLOCATE AUDIO BUFFER (for user)
  1852                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1853                              <1> 	;
  1854                              <1> 	;	For BH = 11 -> SET VOLUME LEVEL
  1855                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1856                              <1> 	;
  1857                              <1> 	;	For BH = 12 -> DISABLE AUDIO DEVICE
  1858                              <1> 	;	    none (if CF = 1 -> Error code in EAX) 	
  1859                              <1> 	;
  1860                              <1> 
  1861 0000F9DA 80FF0D              <1> 	cmp	bh, AUDIO1L/4
  1862 0000F9DD 0F832CCAFFFF        <1> 	jnb	sysret
  1863                              <1> 
  1864 0000F9E3 C0E702              <1> 	shl	bh, 2 ; *4	
  1865 0000F9E6 0FB6F7              <1> 	movzx	esi, bh
  1866                              <1> 
  1867                              <1> 	; 22/04/2017
  1868 0000F9E9 31C0                <1> 	xor	eax, eax
  1869 0000F9EB A3[005D0100]        <1> 	mov	[u.r0], eax  ; 0
  1870                              <1> 		
  1871 0000F9F0 FF96[FBF90000]      <1> 	call	dword [esi+AUDIO1]
  1872                              <1> 	;jc	error
  1873 0000F9F6 E914CAFFFF          <1> 	jmp	sysret	
  1874                              <1> 
  1875 0000F9FB [A11D0000]          <1> AUDIO1:	dd	beep ; FUNCTION = 0 (bl = Duration Counter
  1876                              <1> 		     ; 		     cx = Frequency Divisor
  1877 0000F9FF [2FFA0000]          <1> 	dd	soundc_detect
  1878 0000FA03 [A2FA0000]          <1> 	dd	sound_alloc
  1879 0000FA07 [14FB0000]          <1> 	dd	soundc_init
  1880 0000FA0B [79FC0000]          <1> 	dd	sound_play
  1881 0000FA0F [F2FC0000]          <1> 	dd	sound_pause
  1882 0000FA13 [05FD0000]          <1> 	dd	sound_continue
  1883 0000FA17 [18FD0000]          <1> 	dd	sound_stop
  1884 0000FA1B [2BFD0000]          <1> 	dd	soundc_reset
  1885 0000FA1F [3EFD0000]          <1> 	dd	soundc_cancel
  1886 0000FA23 [64FD0000]          <1> 	dd	sound_dalloc
  1887 0000FA27 [8FFD0000]          <1> 	dd	sound_volume
  1888 0000FA2B [A2FD0000]          <1> 	dd	soundc_disable
  1889                              <1> 	
  1890                              <1> AUDIO1L	EQU	$ - AUDIO1
  1891                              <1> 
  1892                              <1> soundc_detect:
  1893                              <1> 	; FUNCTION = 1
  1894                              <1> 	; bl = Audio device type number 
  1895                              <1> 	; (0= pc speaker, 1 = sound blaster 16, 2 = intel ac97
  1896                              <1> 	;  3= via vt823x, 4 = intel HDA, 0FFh= any)
  1897 0000FA2F 8A25[65550100]      <1> 	mov	ah, [audio_device]
  1898 0000FA35 20E4                <1> 	and	ah, ah
  1899 0000FA37 741E                <1> 	jz	short soundc_get_dev
  1900                              <1> 
  1901 0000FA39 38DC                <1> 	cmp	ah, bl
  1902 0000FA3B 7543                <1> 	jne	short soundc_dev_err
  1903                              <1> 	
  1904 0000FA3D A0[66550100]        <1> 	mov	al, [audio_mode]
  1905                              <1> sysaudio1:
  1906 0000FA42 A3[005D0100]        <1> 	mov	[u.r0], eax
  1907 0000FA47 8B1D[6C550100]      <1> 	mov	ebx, [audio_dev_id] ; (BUS/DEV/FN)
  1908 0000FA4D 8B2D[FC5C0100]      <1> 	mov	ebp, [u.usp]
  1909 0000FA53 895D10              <1> 	mov	[ebp+16], ebx  ; ebx
  1910 0000FA56 C3                  <1> 	retn
  1911                              <1> 
  1912                              <1> soundc_get_dev:
  1913                              <1> 	; 03/04/2017
  1914 0000FA57 C605[64550100]00    <1> 	mov	byte [audio_pci], 0
  1915 0000FA5E 80FB03              <1> 	cmp	bl, 3 ; VIA VT8233 (VT8237R) Audio Controller & AC97 Codec
  1916 0000FA61 751D                <1> 	jne	short soundc_dev_err ; Temporary  (03/04/2017)
  1917                              <1> 				     ; (Here will be modified just after
  1918                              <1> 	;			     ; new sound card code will be ready!)  		
  1919 0000FA63 E833110000          <1> 	call	DetectVT8233
  1920 0000FA68 7216                <1> 	jc	short soundc_dev_err
  1921                              <1> 	; eax = 0
  1922                              <1> 
  1923 0000FA6A FE05[64550100]      <1> 	inc	byte [audio_pci] ; = 1
  1924                              <1> 
  1925                              <1> 	;mov	ebx, [audio_dev_id]
  1926                              <1> 	; ebx = BUS/DEV/FN
  1927                              <1> 	;	00000000BBBBBBBBDDDDDFFF00000000
  1928                              <1> 
  1929 0000FA70 B003                <1> 	mov	al, 3
  1930 0000FA72 A2[65550100]        <1> 	mov	[audio_device], al ; VIA VT8237R (VT3233) Audio Controller
  1931 0000FA77 A2[66550100]        <1> 	mov	[audio_mode], al ; stereo (bit0), 16 bit (bit1) capability	
  1932 0000FA7C 88C4                <1> 	mov	ah, al
  1933 0000FA7E EBC2                <1> 	jmp	short sysaudio1
  1934                              <1> 
  1935                              <1> soundc_dev_err:
  1936 0000FA80 B80F000000          <1> 	mov	eax, ERR_DEV_NOT_RDY ; Device not ready !
  1937 0000FA85 EB0C                <1> 	jmp	short sysaudio_err
  1938                              <1> 
  1939                              <1> sound_buff_error:
  1940 0000FA87 B82E000000          <1> 	mov	eax, ERR_BUFFER ; Buffer error !
  1941 0000FA8C EB05                <1> 	jmp	short sysaudio_err
  1942                              <1> 
  1943                              <1> soundc_respond_err:
  1944                              <1> 	; ERR_TIME_OUT ; 'time out !' error	
  1945 0000FA8E B819000000          <1> 	mov	eax, ERR_DEV_NOT_RESP ; 'device not responding !' error
  1946                              <1> sysaudio_err:
  1947 0000FA93 A3[005D0100]        <1> 	mov	[u.r0], eax
  1948 0000FA98 A3[645D0100]        <1> 	mov	[u.error], eax
  1949 0000FA9D E94DC9FFFF          <1> 	jmp	error
  1950                              <1> 
  1951                              <1> sound_alloc:
  1952                              <1> 	; FUNCTION =  2
  1953                              <1> 	; ecx = audio buffer size (in bytes)
  1954                              <1> 	; edx = audio buffer address (virtual)
  1955                              <1> 	; 21/04/2017
  1956 0000FAA2 A1[78550100]        <1> 	mov	eax, [audio_buffer] ; audio buffer address (current)
  1957 0000FAA7 09C0                <1> 	or	eax, eax
  1958 0000FAA9 743D                <1> 	jz	short  snd_alloc_1
  1959                              <1> 	; audio buffer exists !
  1960 0000FAAB 8A1D[4F5D0100]      <1> 	mov	bl, [u.uno]
  1961 0000FAB1 3A1D[8D550100]      <1> 	cmp	bl, [audio_user]
  1962 0000FAB7 0F85AA000000        <1> 	jne	sndc_owner_error ; not owner !
  1963 0000FABD 39D0                <1> 	cmp	eax, edx ; same virtual buffer address ?
  1964 0000FABF 7452                <1> 	je	short snd_alloc_2 ; Nothing to do !
  1965                              <1> 				  ; Buffer has been set already!
  1966 0000FAC1 51                  <1> 	push	ecx
  1967 0000FAC2 52                  <1> 	push	edx
  1968 0000FAC3 89C3                <1> 	mov	ebx, eax ; audio buffer address (current)
  1969 0000FAC5 8B0D[80550100]      <1> 	mov	ecx, [audio_buff_size]
  1970 0000FACB E8945CFFFF          <1> 	call	deallocate_user_pages
  1971 0000FAD0 5A                  <1> 	pop	edx
  1972 0000FAD1 59                  <1> 	pop	ecx
  1973 0000FAD2 31C0                <1> 	xor	eax, eax ; 0
  1974 0000FAD4 A3[78550100]        <1> 	mov	[audio_buffer], eax  ; 0
  1975 0000FAD9 A3[7C550100]        <1>  	mov	[audio_p_buffer], eax  ; 0
  1976 0000FADE A3[80550100]        <1>  	mov	[audio_buff_size], eax
  1977 0000FAE3 A2[8D550100]        <1> 	mov	[audio_user], al ; 0
  1978                              <1> snd_alloc_1:
  1979 0000FAE8 89D3                <1> 	mov	ebx, edx
  1980 0000FAEA E86B5DFFFF          <1> 	call	allocate_user_pages
  1981 0000FAEF 7296                <1> 	jc	short sound_buff_error  ; insuffient memory, buff error
  1982                              <1> 	; eax = physical address of the user's audio buffer
  1983                              <1> 	; ebx = virtual address of the user's audio buffer
  1984                              <1> 	; ecx = buffer size (in bytes)
  1985 0000FAF1 A3[7C550100]        <1> 	mov	[audio_p_buffer], eax
  1986 0000FAF6 891D[78550100]      <1> 	mov	[audio_buffer], ebx
  1987 0000FAFC 890D[80550100]      <1>  	mov	[audio_buff_size], ecx
  1988 0000FB02 8A15[4F5D0100]      <1> 	mov	dl, [u.uno]
  1989 0000FB08 8815[8D550100]      <1> 	mov	[audio_user], dl
  1990 0000FB0E A3[005D0100]        <1> 	mov	[u.r0], eax
  1991                              <1> snd_alloc_2:
  1992 0000FB13 C3                  <1> 	retn
  1993                              <1> 
  1994                              <1> soundc_init:
  1995                              <1> 	; FUNCTION = 3 
  1996                              <1> 	; bl = method (0= s.r.b., 1= callback, 2= auto incr s.r.b.)
  1997                              <1> 	; cl = signal response byte (initial or fixed) value
  1998                              <1> 	; edx = signal response byte or callback address
  1999                              <1> 	; 23/04/2017
  2000                              <1> 	; 22/04/2017
  2001                              <1> 	; 13/04/2017, 14/04/2017, 16/04/2017, 21/04/2017
  2002                              <1> 	; 03/04/2017, 10/04/2017
  2003 0000FB14 A0[65550100]        <1> 	mov	al, [audio_device]
  2004 0000FB19 20C0                <1> 	and	al, al
  2005 0000FB1B 752A                <1> 	jnz	short sndc_init_6
  2006                              <1> 	;
  2007 0000FB1D C605[64550100]00    <1> 	mov	byte [audio_pci], 0
  2008 0000FB24 52                  <1> 	push	edx
  2009 0000FB25 53                  <1> 	push	ebx
  2010 0000FB26 51                  <1> 	push	ecx
  2011 0000FB27 E86F100000          <1> 	call	DetectVT8233
  2012 0000FB2C 59                  <1> 	pop	ecx
  2013 0000FB2D 5B                  <1> 	pop	ebx
  2014 0000FB2E 5A                  <1> 	pop	edx
  2015 0000FB2F 0F824BFFFFFF        <1> 	jc	soundc_dev_err
  2016                              <1> 	; eax = 0
  2017 0000FB35 FE05[64550100]      <1> 	inc	byte [audio_pci] ; = 1
  2018                              <1> 	;mov	ebx, [audio_dev_id]
  2019                              <1> 	; ebx = BUS/DEV/FN
  2020                              <1> 	;	00000000BBBBBBBBDDDDDFFF00000000
  2021 0000FB3B B003                <1> 	mov	al, 3
  2022 0000FB3D A2[65550100]        <1> 	mov	[audio_device], al ; VIA VT8237R (VT3233) Audio Controller
  2023 0000FB42 A2[66550100]        <1> 	mov	[audio_mode], al ; stereo (bit0), 16 bit (bit1) capability	
  2024                              <1> sndc_init_6:
  2025 0000FB47 833D[78550100]00    <1> 	cmp	dword [audio_buffer], 0
  2026 0000FB4E 0F8633FFFFFF        <1> 	jna	sound_buff_error
  2027 0000FB54 A0[4F5D0100]        <1> 	mov	al, [u.uno]
  2028 0000FB59 8A25[8D550100]      <1> 	mov	ah, [audio_user]
  2029 0000FB5F 08E4                <1> 	or	ah, ah
  2030 0000FB61 7418                <1> 	jz	short sndc_init0
  2031 0000FB63 38E0                <1> 	cmp	al, ah
  2032 0000FB65 7419                <1> 	je	short sndc_init1
  2033                              <1> sndc_owner_error:
  2034 0000FB67 B80B000000          <1> 	mov	eax, ERR_NOT_OWNER ; 'permission denied !' error
  2035                              <1> sndc_perm_error:
  2036 0000FB6C A3[005D0100]        <1> 	mov	[u.r0], eax
  2037 0000FB71 A3[645D0100]        <1> 	mov	[u.error], eax
  2038 0000FB76 E974C8FFFF          <1> 	jmp	error
  2039                              <1> sndc_init0:
  2040 0000FB7B A2[8D550100]        <1> 	mov	[audio_user], al
  2041                              <1> sndc_init1:
  2042 0000FB80 8915[90550100]      <1> 	mov	[audio_cb_addr], edx
  2043 0000FB86 881D[8E550100]      <1> 	mov	[audio_cb_mode], bl
  2044 0000FB8C 880D[8F550100]      <1> 	mov	[audio_srb], cl
  2045                              <1> 
  2046 0000FB92 E87A110000          <1> 	call	reset_codec
  2047 0000FB97 0F82F1FEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2048                              <1> 
  2049                              <1> 	; eax = 1
  2050 0000FB9D E8ED110000          <1> 	call	codec_io_w16 ; w32
  2051                              <1> 
  2052 0000FBA2 E89C120000          <1> 	call	channel_reset
  2053                              <1> 
  2054                              <1> 	; setup the Codec (actually mixer registers) 
  2055 0000FBA7 E8CF120000          <1>         call    codec_config  ; unmute codec, set rates.
  2056 0000FBAC 0F82DCFEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2057                              <1> 
  2058                              <1> 	; 13/04/2017
  2059 0000FBB2 A0[67550100]        <1> 	mov	al, [audio_intr] ; IRQ number	
  2060 0000FBB7 BB[140F0100]        <1> 	mov	ebx, vt8233_int_handler
  2061 0000FBBC E80BFEFFFF          <1> 	call	set_dev_IRQ_service
  2062                              <1> 
  2063                              <1> 	; SETUP (audio) INTERRUPT CALLBACK SERVICE
  2064 0000FBC1 8A1D[67550100]      <1> 	mov	bl, [audio_intr] ; IRQ number
  2065 0000FBC7 8A3D[8E550100]      <1> 	mov	bh, [audio_cb_mode]
  2066 0000FBCD FEC7                <1> 	inc	bh  ; 1 = Signal Response Byte method (fixed value)
  2067                              <1> 		    ; 2 = Callback service method
  2068                              <1> 		    ; 3 = Auto Increment S.R.B. method 	
  2069 0000FBCF 8A0D[8F550100]      <1> 	mov	cl, [audio_srb]
  2070 0000FBD5 8B15[90550100]      <1> 	mov	edx, [audio_cb_addr]
  2071 0000FBDB A0[8D550100]        <1> 	mov	al, [audio_user]
  2072                              <1> 	; 14/04/2017
  2073 0000FBE0 E830020000          <1>  	call	set_irq_callback_service
  2074                              <1> 	; 16/04/2017
  2075 0000FBE5 A3[005D0100]        <1> 	mov	[u.r0], eax
  2076                              <1> 	;jnc	sysret
  2077 0000FBEA 7316                <1> 	jnc	short sndc_init2 ; 21/04/2017
  2078                              <1> 	;
  2079 0000FBEC A3[645D0100]        <1> 	mov	dword [u.error], eax
  2080                              <1> 
  2081 0000FBF1 A0[67550100]        <1> 	mov	al, [audio_intr] ; IRQ number	
  2082 0000FBF6 31DB                <1> 	xor	ebx, ebx ; reset IRQ handler address
  2083 0000FBF8 E8CFFDFFFF          <1> 	call	set_dev_IRQ_service
  2084                              <1> 
  2085 0000FBFD E9EDC7FFFF          <1> 	jmp	error
  2086                              <1> 
  2087                              <1> sndc_init2:
  2088                              <1> 	; 21/04/2017
  2089 0000FC02 8B0D[80550100]      <1> 	mov	ecx, [audio_buff_size] ; audio buffer size
  2090 0000FC08 D1E1                <1> 	shl	ecx, 1
  2091 0000FC0A A1[84550100]        <1> 	mov	eax, [audio_dma_buff]
  2092 0000FC0F 21C0                <1> 	and	eax, eax
  2093 0000FC11 7415                <1> 	jz	short sndc_init3
  2094 0000FC13 8B15[88550100]      <1> 	mov	edx, [audio_dmabuff_size] ; dma buffer size
  2095 0000FC19 39D1                <1> 	cmp	ecx, edx
  2096 0000FC1B 745B                <1> 	je	short sndc_init5
  2097 0000FC1D 87CA                <1> 	xchg	ecx, edx
  2098 0000FC1F E8005AFFFF          <1> 	call	deallocate_memory_block
  2099 0000FC24 87D1                <1> 	xchg	edx, ecx
  2100 0000FC26 31C0                <1> 	xor	eax, eax
  2101                              <1> sndc_init3:
  2102                              <1> 	; EAX = Beginning address (physical)
  2103                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  2104                              <1> 	; ECX = Number of bytes to be allocated		
  2105 0000FC28 E8F657FFFF          <1> 	call	allocate_memory_block
  2106 0000FC2D 0F8254FEFFFF        <1> 	jc	sound_buff_error
  2107                              <1> 	; set dma buffer address and size parameters
  2108 0000FC33 A3[84550100]        <1> 	mov	[audio_dma_buff], eax ; dma buffer address
  2109 0000FC38 890D[88550100]      <1> 	mov	[audio_dmabuff_size], ecx ; dma buffer size
  2110                              <1> 	; EAX = Beginning (physical) addr of the allocated mem block
  2111                              <1> 	; ECX = Num of allocated bytes (rounded up to page borders)
  2112 0000FC3E 803D[64550100]00    <1> 	cmp	byte [audio_pci], 0 ; AC97 audio controller ?
  2113 0000FC45 7723                <1> 	ja	short sndc_init4
  2114                              <1> 	; Sound Blaster 16 uses classic DMA
  2115 0000FC47 89C2                <1> 	mov	edx, eax
  2116 0000FC49 01CA                <1> 	add	edx, ecx
  2117 0000FC4B 81FA00000001        <1> 	cmp	edx, 1000000h ; 1st 16 MB
  2118 0000FC51 7617                <1> 	jna	short sndc_init4
  2119                              <1> 	; error !
  2120                              <1> 	; restore Memory Allocation Table Content
  2121                              <1> 	; EAX = Beginning address (physical)
  2122                              <1> 	; ECX = Number of bytes to be deallocated
  2123 0000FC53 E8CC59FFFF          <1> 	call	deallocate_memory_block
  2124                              <1> 	; reset dma buffer address and size parameters
  2125 0000FC58 31C0                <1> 	xor	eax, eax ; 0
  2126 0000FC5A A3[84550100]        <1> 	mov	[audio_dma_buff], eax ; 0
  2127 0000FC5F 890D[88550100]      <1> 	mov	[audio_dmabuff_size], ecx ; 0
  2128 0000FC65 E91DFEFFFF          <1> 	jmp	sound_buff_error				
  2129                              <1> 
  2130                              <1> sndc_init4:
  2131 0000FC6A 803D[65550100]03    <1> 	cmp	byte [audio_device], 3
  2132 0000FC71 7505                <1> 	jne	short sndc_init5 ; temporary ; 21/04/2017
  2133 0000FC73 E87C130000          <1> 	call	set_vt8233_bdl	
  2134                              <1> sndc_init5:
  2135                              <1> 	;sub	eax, eax ; 0
  2136                              <1> 	;mov	[u.r0], eax ; 0 = no error, successful
  2137 0000FC78 C3                  <1> 	retn
  2138                              <1> 
  2139                              <1> sound_play:
  2140                              <1> 	; FUNCTION = 4 
  2141                              <1> 	; bl = Mode 
  2142                              <1> 	;      bit 0 = mono/stereo (1 = stereo)		
  2143                              <1> 	;      bit 1 = 8 bit / 16 bit (1 = 16 bit)
  2144                              <1> 	; cx = Sampling Rate (Hz)
  2145                              <1> 
  2146                              <1> 	; 21/04/2017	
  2147                              <1> 	; ... device check at first
  2148 0000FC79 A0[65550100]        <1> 	mov	al, [audio_device]
  2149 0000FC7E 08C0                <1> 	or	al, al ; 0 ; pc speaker or invalid 
  2150 0000FC80 0F841521FFFF        <1> 	jz	beeper_gfx ; 'video.s' ; temporary !
  2151 0000FC86 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2152 0000FC88 0F85F2FDFFFF        <1> 	jne	soundc_dev_err ; temporary ! 
  2153                              <1> 
  2154                              <1> 	; ... buffer & (buffer) owner check at second
  2155 0000FC8E 833D[78550100]00    <1> 	cmp	dword [audio_buffer], 0
  2156 0000FC95 0F86ECFDFFFF        <1> 	jna	sound_buff_error
  2157 0000FC9B A0[4F5D0100]        <1> 	mov	al, [u.uno]
  2158 0000FCA0 3A05[8D550100]      <1> 	cmp	al, [audio_user]
  2159 0000FCA6 0F85BBFEFFFF        <1> 	jne	sndc_owner_error
  2160                              <1> 
  2161 0000FCAC 66890D[96550100]    <1> 	mov	[audio_freq], cx ; sample frequency (Hertz)
  2162 0000FCB3 88D8                <1> 	mov	al, bl
  2163 0000FCB5 2401                <1> 	and	al, 1 ; mono/stereo (1= stereo)
  2164 0000FCB7 FEC0                <1> 	inc	al ; channels
  2165 0000FCB9 A2[95550100]        <1> 	mov	[audio_stmo], al ; sound channels (1 or 2)
  2166 0000FCBE B008                <1> 	mov	al, 8
  2167 0000FCC0 F6C302              <1> 	test	bl, 2 ; bits per sample (1= 16 bit)
  2168 0000FCC3 7402                <1> 	jz	short snd_play_bps
  2169 0000FCC5 D0E0                <1> 	shl	al, 1  
  2170                              <1> snd_play_bps:	
  2171 0000FCC7 A2[94550100]        <1> 	mov	[audio_bps], al
  2172                              <1> 	; Transfer ring 3 (user's) audio buffer content to dma buffer
  2173 0000FCCC 8B3D[84550100]      <1> 	mov	edi, [audio_dma_buff] ; dma buffer (ring 0)
  2174 0000FCD2 09FF                <1> 	or	edi, edi
  2175 0000FCD4 0F84ADFDFFFF        <1> 	jz	sound_buff_error
  2176 0000FCDA 8B35[7C550100]      <1> 	mov	esi, [audio_p_buffer] ; physical address (ring 3)
  2177 0000FCE0 8B0D[88550100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2178                              <1> 	;rep	movsb
  2179 0000FCE6 C1E902              <1> 	shr	ecx, 2
  2180 0000FCE9 F3A5                <1> 	rep	movsd
  2181                              <1> 	
  2182 0000FCEB E835130000          <1> 	call	vt8233_start_play
  2183                              <1> 	
  2184 0000FCF0 EB86                <1> 	jmp	sndc_init5
  2185                              <1> 
  2186                              <1> sound_pause:
  2187                              <1> 	; FUNCTION = 5
  2188                              <1> 	; Pause
  2189                              <1> 	; 22/04/2017
  2190 0000FCF2 E8F7000000          <1> 	call	snd_dev_check
  2191 0000FCF7 7231                <1> 	jc	short snd_nothing ; temporary.
  2192 0000FCF9 E8FE000000          <1> 	call	snd_buf_check
  2193 0000FCFE 722A                <1> 	jc	short snd_nothing ; temporary.
  2194                              <1> 	;mov	al, [audio_device]
  2195                              <1> 	;cmp	al, 3 ; VIA VT 8237R (vt8233)
  2196                              <1> 	;jne	short snd_nothing ; temporary.
  2197                              <1> 	;call	vt8233_pause
  2198                              <1> 	;retn
  2199 0000FD00 E9C7130000          <1> 	jmp	vt8233_pause
  2200                              <1> 
  2201                              <1> sound_continue:
  2202                              <1> 	; FUNCTION = 6
  2203                              <1> 	; Continue to play
  2204                              <1> 	; 22/04/2017
  2205 0000FD05 E8E4000000          <1> 	call	snd_dev_check
  2206 0000FD0A 721E                <1> 	jc	short snd_nothing ; temporary.
  2207 0000FD0C E8EB000000          <1> 	call	snd_buf_check
  2208 0000FD11 7217                <1> 	jc	short snd_nothing ; temporary.
  2209                              <1> 	;mov	al, [audio_device]
  2210                              <1> 	;cmp	al, 3 ; VIA VT 8237R (vt8233)
  2211                              <1> 	;jne	short snd_nothing ; temporary.
  2212                              <1> 	;call	vt8233_play
  2213                              <1> 	;retn
  2214 0000FD13 E958130000          <1> 	jmp	vt8233_play
  2215                              <1> 
  2216                              <1> sound_stop:
  2217                              <1> 	; FUNCTION = 7
  2218                              <1> 	; Stop playing
  2219                              <1> 	; 22/04/2017
  2220                              <1> 	; 21/04/2017
  2221 0000FD18 E8D1000000          <1> 	call	snd_dev_check
  2222 0000FD1D 720B                <1> 	jc	short snd_nothing ; temporary.
  2223 0000FD1F E8D8000000          <1> 	call	snd_buf_check
  2224                              <1> 	;jc	short snd_nothing ; temporary.	
  2225                              <1> 	
  2226                              <1> 	;mov	al, [audio_device]
  2227                              <1> 	;cmp	al, 3 ; VIA VT 8237R (vt8233)
  2228                              <1> 	;jne	short snd_nothing ; temporary.
  2229                              <1> 	;call	vt8233_stop
  2230                              <1> 	;retn
  2231                              <1> 	;jmp	vt8233_stop
  2232 0000FD24 0F83B1120000        <1> 	jnc	vt8233_stop
  2233                              <1> 
  2234                              <1> snd_nothing:
  2235                              <1> 	; 21/04/2017
  2236 0000FD2A C3                  <1> 	retn
  2237                              <1> 
  2238                              <1> soundc_reset:
  2239                              <1> 	; FUNCTION = 8
  2240                              <1> 	; Reset Audio Controller
  2241                              <1> 	; 22/04/2017
  2242 0000FD2B E8BE000000          <1> 	call	snd_dev_check
  2243 0000FD30 72F8                <1> 	jc	short snd_nothing ; temporary.
  2244 0000FD32 E8C5000000          <1> 	call	snd_buf_check
  2245 0000FD37 72F1                <1> 	jc	short snd_nothing ; temporary.	
  2246                              <1> 	
  2247                              <1> 	;mov	al, [audio_device]
  2248                              <1> 	;cmp	al, 3 ; VIA VT 8237R (vt8233)
  2249                              <1> 	;jne	short snd_nothing ; temporary.
  2250                              <1> 	;call	vt8233_reset
  2251                              <1> 	;retn
  2252 0000FD39 E9A0130000          <1> 	jmp	vt8233_reset
  2253                              <1> 
  2254                              <1> soundc_cancel:
  2255                              <1> 	; FUNCTION = 9
  2256                              <1> 	; Cancel audio callback service
  2257                              <1> 	; 22/04/2017
  2258 0000FD3E A0[8D550100]        <1> 	mov	al, [audio_user]	
  2259 0000FD43 3A05[4F5D0100]      <1> 	cmp	al, [u.uno]
  2260 0000FD49 75DF                <1> 	jne	short snd_nothing
  2261                              <1> 	; RESET (audio) INTERRUPT CALLBACK SERVICE
  2262 0000FD4B 8A1D[67550100]      <1> 	mov	bl, [audio_intr] ; IRQ number
  2263 0000FD51 A0[4F5D0100]        <1> 	mov	al, [u.uno]
  2264 0000FD56 28FF                <1> 	sub	bh, bh ; 0 ; unlink IRQ from user service
  2265 0000FD58 E8B8000000          <1>  	call	set_irq_callback_service
  2266 0000FD5D 0F8209FEFFFF        <1> 	jc	sndc_perm_error ; 'permission denied' error
  2267 0000FD63 C3                  <1> 	retn
  2268                              <1> 
  2269                              <1> sound_dalloc:
  2270                              <1> 	; FUNCTION = 10
  2271                              <1> 	; Deallocate (ring 3) audio buffer
  2272                              <1> 	; 22/04/2017
  2273 0000FD64 A0[8D550100]        <1> 	mov	al, [audio_user]	
  2274 0000FD69 3A05[4F5D0100]      <1> 	cmp	al, [u.uno]
  2275 0000FD6F 75B9                <1> 	jne	short snd_nothing
  2276 0000FD71 8B1D[78550100]      <1> 	mov	ebx, [audio_buffer]
  2277                              <1> 	;or	ebx, ebx
  2278                              <1> 	;jz	short snd_nothing
  2279 0000FD77 8B0D[80550100]      <1> 	mov	ecx, [audio_buff_size]
  2280 0000FD7D E8E259FFFF          <1> 	call	deallocate_user_pages
  2281 0000FD82 31C0                <1> 	xor	eax, eax
  2282 0000FD84 A3[78550100]        <1> 	mov	[audio_buffer], eax ; 0
  2283 0000FD89 A2[8D550100]        <1> 	mov	[audio_user], al ; 0
  2284 0000FD8E C3                  <1> 	retn
  2285                              <1> 
  2286                              <1> sound_volume:
  2287                              <1> 	; FUNCTION = 11
  2288                              <1> 	; Deallocate (ring 3) audio buffer
  2289                              <1> 	; 22/04/2017
  2290                              <1> 	; bl = component (0 = master/playback/lineout volume)
  2291                              <1> 	; cl = left channel volume level (0 to 31)
  2292                              <1> 	; ch = right channel volume level (0 to 31)
  2293                              <1> 
  2294 0000FD8F E85A000000          <1> 	call	snd_dev_check
  2295 0000FD94 7294                <1> 	jc	short snd_nothing ; temporary.
  2296 0000FD96 E861000000          <1> 	call	snd_buf_check
  2297 0000FD9B 728D                <1> 	jc	short snd_nothing ; temporary.	
  2298                              <1> 
  2299                              <1> 	;mov	al, [audio_device]
  2300                              <1> 	;cmp	al, 3 ; VIA VT 8237R (vt8233)
  2301                              <1> 	;jne	short snd_nothing ; temporary.
  2302                              <1> 	;call	vt8233_volume
  2303                              <1> 	;retn
  2304 0000FD9D E955130000          <1> 	jmp	vt8233_volume
  2305                              <1> 
  2306                              <1> soundc_disable:
  2307                              <1> 	; FUNCTION = 12 
  2308                              <1> 	; Disable audio device (and unlink DMA memory)
  2309                              <1> 	; 22/04/2017
  2310 0000FDA2 E847000000          <1> 	call	snd_dev_check
  2311 0000FDA7 0F82D3FCFFFF        <1> 	jc	soundc_dev_err ; temporary.
  2312 0000FDAD E84A000000          <1> 	call	snd_buf_check
  2313 0000FDB2 0F82AFFDFFFF        <1> 	jc	sndc_owner_error ; temporary.
  2314                              <1> 
  2315                              <1> 	;mov	al, [audio_device]
  2316                              <1> 	;cmp	al, 3 ; VIA VT 8237R (vt8233)
  2317                              <1> 	;jne	short snd_nothing ; temporary.
  2318 0000FDB8 E81E120000          <1> 	call	vt8233_stop
  2319                              <1> 
  2320 0000FDBD A0[67550100]        <1> 	mov	al, [audio_intr]
  2321 0000FDC2 29DB                <1> 	sub	ebx, ebx ; 0 = reset
  2322 0000FDC4 E803FCFFFF          <1> 	call	set_dev_IRQ_service
  2323                              <1> 
  2324                              <1> 	;mov	al, [audio_intr]
  2325 0000FDC9 28E4                <1> 	sub	ah, ah ; 0 = reset
  2326 0000FDCB E867F8FFFF          <1> 	call	set_hardware_int_vector
  2327                              <1> 
  2328 0000FDD0 31C0                <1> 	xor	eax, eax
  2329 0000FDD2 A2[65550100]        <1> 	mov	byte [audio_device], al
  2330 0000FDD7 A2[67550100]        <1> 	mov	byte [audio_intr], al
  2331 0000FDDC 8705[84550100]      <1> 	xchg	eax, [audio_dma_buff]
  2332                              <1> 	;or	eax, eax
  2333                              <1> 	;jz	short snd_disable_1
  2334                              <1> 	;sub	ecx, ecx
  2335                              <1> 	;xchg	ecx, [audio_dmabuff_size]
  2336 0000FDE2 8B0D[88550100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2337 0000FDE8 E83758FFFF          <1> 	call	deallocate_memory_block
  2338                              <1> ;snd_disable_1:
  2339 0000FDED C3                  <1> 	retn
  2340                              <1> 
  2341                              <1> snd_dev_check:
  2342                              <1> 	; 22/04/2017
  2343                              <1> 	; 21/04/2017
  2344                              <1> 	; ... device check at first
  2345 0000FDEE A0[65550100]        <1> 	mov	al, [audio_device]
  2346 0000FDF3 08C0                <1> 	or	al, al ; 0 ; pc speaker or invalid 
  2347 0000FDF5 741C                <1> 	jz	short snd_dbchk_stc ; nothing to do ! ; temporary !
  2348 0000FDF7 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2349 0000FDF9 7518                <1> 	jne	short snd_dbchk_stc
  2350 0000FDFB C3                  <1> 	retn
  2351                              <1> 
  2352                              <1> snd_buf_check:
  2353                              <1> 	; 22/04/2017
  2354                              <1> 	; 21/04/2017
  2355                              <1> 	; ... buffer & (buffer) owner check at second
  2356 0000FDFC 833D[78550100]00    <1> 	cmp	dword [audio_buffer], 0
  2357 0000FE03 760E                <1> 	jna	short snd_dbchk_stc
  2358                              <1> snd_user_check:
  2359 0000FE05 A0[4F5D0100]        <1> 	mov	al, [u.uno]
  2360 0000FE0A 3A05[8D550100]      <1> 	cmp	al, [audio_user]
  2361 0000FE10 7501                <1> 	jne	short snd_dbchk_stc
  2362 0000FE12 C3                  <1> 	retn
  2363                              <1> 
  2364                              <1> snd_dbchk_stc:
  2365 0000FE13 F9                  <1> 	stc
  2366 0000FE14 C3                  <1> 	retn
  2367                              <1> 
  2368                              <1> set_irq_callback_service:
  2369                              <1> 	; 22/04/2017
  2370                              <1> 	; caller: 'syscalbac' or 'sysaudio' or ...
  2371                              <1> 	; 17/04/2017
  2372                              <1> 	; 14/04/2017
  2373                              <1> 	; 13/04/2017
  2374                              <1> 	; 28/02/2017
  2375                              <1> 	; 26/02/2017
  2376                              <1> 	; 24/02/2017
  2377                              <1> 	; 21/02/2017 - TRDOS 386 (TRDOS v2.0)
  2378                              <1> 	;
  2379                              <1> 	; Link or unlink IRQ callback service to/from user (ring 3)	
  2380                              <1> 	;
  2381                              <1> 	; INPUT ->
  2382                              <1> 	;	If AL = 0, the caller is 'syscalbac';
  2383                              <1> 	;	   otherwise, the caller is 'sysaudio' or ...
  2384                              <1> 	;	   (AL = user number) 
  2385                              <1> 	; 	 
  2386                              <1> 	;	BL = IRQ number (Hardware interrupt request number)
  2387                              <1> 	;	     (0 t0 15 but IRQ 0,1,2,6,8,14,15 are prohibited)
  2388                              <1> 	;	     IRQ numbers 3,4,5,7,9,10,11,12,13 are valid
  2389                              <1> 	;	     (numbers >15 are invalid)
  2390                              <1> 	;
  2391                              <1> 	;	BH = 0 = Unlink IRQ (in BL) from user (ring 3) service
  2392                              <1> 	;	     1 = Link IRQ by using Signal Response Byte method
  2393                              <1> 	;	     2 = Link IRQ by using Callback service method 		
  2394                              <1> 	;	     3 = Link IRQ by using Auto Increment S.R.B. method 	
  2395                              <1> 	;	    >3 = invalid 
  2396                              <1> 	;		 (syscallback version will return to user) 	
  2397                              <1> 	;	
  2398                              <1> 	;	CL = Signal Return/Response Byte value 
  2399                              <1> 	;
  2400                              <1> 	;	If BH = 2, kernel will put a counter value 
  2401                              <1> 	;	          (into the S.R.B. addr)
  2402                              <1> 	;		  between 0 to 255. (start value = CL+1)
  2403                              <1> 	;	
  2404                              <1> 	;	NOTE: counter value, for example: even and odd numbers
  2405                              <1> 	;	      may be used for -audio- DMA buffer switch 
  2406                              <1> 	;	      within double buffer method, etc. 		
  2407                              <1> 	;
  2408                              <1> 	;	EDX = Signal return (Response) byte address
  2409                              <1> 	;	       		  - or -
  2410                              <1> 	;	      Interrupt/Callback service/routine address
  2411                              <1> 	; 	
  2412                              <1> 	;	      (virtual address in user's memory space)
  2413                              <1> 	;
  2414                              <1> 	; OUTPUT ->
  2415                              <1> 	;	CF = 0 & EAX = 0 -> Successful setting
  2416                              <1> 	;	CF = 1 & EAX > 0 -> IRQ is prohibited or locked 
  2417                              <1> 	;			by another process
  2418                              <1> 	;		 eax = ERR_PERM_DENIED -> prohibited or locked
  2419                              <1> 	;		 eax = ERR_INV_PARAMETER -> 
  2420                              <1> 	;		       invalid parameter/option or bad address
  2421                              <1> 	;
  2422                              <1> 	; TRDOS 386 - IRQ CALLBACK structures (parameters):
  2423                              <1> 	;	
  2424                              <1> 	;	   [u.irqlock] = 1 word, IRQ flags (0-15) that indicates
  2425                              <1> 	;			which IRQs are locked by (that) user.
  2426                              <1> 	;		        Lock and unlock (by user) will change
  2427                              <1> 	;			these flags or 'terminate process' (sysexit)
  2428                              <1> 	;			will clear these flags and unlock those IRQs.
  2429                              <1> 	;			               
  2430                              <1> 	;		   	Bit 0 is for IRQ 0 and Bit 15 is for IRQ 15
  2431                              <1> 	;
  2432                              <1> 	;	   IRQ(x).owner	 : 1 byte, user, [u.uno], 0 = free (unlocked)	
  2433                              <1> 	;
  2434                              <1> 	;	   IRQ(x).method : 1 byte for callback method & status
  2435                              <1> 	;			   0 = Signal Response Byte method
  2436                              <1> 	;			   1 = Callback service method
  2437                              <1> 	;			   >1 = invalid for current 'syscalback'.
  2438                              <1> 	;			or(+) 80h = IRQ is in use by system (ring 0)
  2439                              <1> 	;			            function (audio etc.) or
  2440                              <1> 	;			   	    a device driver.	   	
  2441                              <1> 	;			(system function will ignore the lock/owner)
  2442                              <1> 	;
  2443                              <1> 	;	   IRQ(x).srb	: 1 byte, Signal Return/Response byte value
  2444                              <1> 	;			  (a fixed value by user or a counter value
  2445                              <1> 	;			 from 0 to 255, which is increased by every
  2446                              <1> 	;			 interrupt just before putting it into 
  2447                              <1> 	;			 the Signal Response byte address
  2448                              <1> 	;			 (This is not used in callback serv method)
  2449                              <1> 	;	    	  
  2450                              <1> 	;	   IRQ(x).addr	: 1 dword
  2451                              <1> 	;			  Signal Response Byte address (physical)
  2452                              <1> 	;			  		-or-
  2453                              <1> 	;			  Callback service address (virtual)
  2454                              <1> 	;
  2455                              <1> 	;	   IRQ(x).dev	: 1 byte
  2456                              <1> 	;			  0 = Default device or kernel function
  2457                              <1> 	;			  		-or-
  2458                              <1> 	;			  1-255 = Assigned device driver number
  2459                              <1> 	;
  2460                              <1> 	;	   (x) = 3,4,5,7,9,10,11,12,13
  2461                              <1> 	;
  2462                              <1> 	
  2463 0000FE15 80FB0F              <1> 	cmp	bl, 15
  2464 0000FE18 7729                <1> 	ja	short scbs_2
  2465                              <1> 	
  2466 0000FE1A 80FF03              <1> 	cmp	bh, 3
  2467 0000FE1D 7724                <1> 	ja	short scbs_2  ; invalid parameter
  2468                              <1> 
  2469 0000FE1F 0FB6FB              <1> 	movzx	edi, bl ; save IRQ number
  2470                              <1> 
  2471                              <1> 		;  IRQ 0,1,2,6,8,14,15 are prohibited
  2472                              <1> 	;IRQenum: ; 'trdosk9.s'
  2473                              <1> 	;	db  0,0,0,1,2,3,0,4,0,5,6,7,8,9,0,0
  2474                              <1> 
  2475 0000FE22 0FB6B7[18080100]    <1> 	movzx	esi, byte [edi+IRQenum] ; IRQ avaibility 
  2476                              <1> 					; enumeration/index
  2477 0000FE29 08FF                <1> 	or	bh, bh
  2478 0000FE2B 741D                <1> 	jz	short scbs_4 ; unlink the IRQ (in BL)
  2479                              <1> 
  2480 0000FE2D FECF                <1> 	dec	bh
  2481                              <1> 	; bh = method (0 = signal response byte, 1 = callback)
  2482                              <1> 	;	      (2 = auto increment of signal response byte) 
  2483                              <1> 
  2484                              <1> 	;dec	esi
  2485 0000FE2F 664E                <1> 	dec	si
  2486 0000FE31 7809                <1> 	js	short scbs_1 ;  0 -> 0FFFFh  
  2487                              <1> 			
  2488                              <1> 	; ESI = IRQ callback parameters index number (0 to 8)
  2489                              <1> 
  2490 0000FE33 80BE[16550100]00    <1> 	cmp	byte [esi+IRQ.owner], 0 ; locked ?
  2491 0000FE3A 7632                <1> 	jna	short scbs_6	; no... OK...	
  2492                              <1> 
  2493                              <1> scbs_1:
  2494                              <1> 	; permission denied (prohibited IRQ)
  2495 0000FE3C B80B000000          <1> 	mov	eax, ERR_PERM_DENIED
  2496 0000FE41 F9                  <1> 	stc
  2497 0000FE42 C3                  <1> 	retn
  2498                              <1> scbs_2:
  2499 0000FE43 F9                  <1> 	stc
  2500                              <1> scbs_3:
  2501 0000FE44 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER
  2502 0000FE49 C3                  <1> 	retn
  2503                              <1> 
  2504                              <1> scbs_4: ; unlink the requested IRQ (if it belongs to current user)
  2505                              <1> 	; 22/04/2017
  2506                              <1> 	; 14/04/2017
  2507                              <1> 	; If AL = 0 -> The caller is 'syscalbac'
  2508 0000FE4A 8AA6[16550100]      <1> 	mov	ah, [esi+IRQ.owner]
  2509 0000FE50 3A25[4F5D0100]      <1> 	cmp	ah, [u.uno]
  2510 0000FE56 75E4                <1> 	jne	short scbs_1
  2511                              <1> 
  2512 0000FE58 FE0D[725D0100]      <1> 	dec	byte [u.irqc] ; decrease IRQ count (in use)
  2513                              <1> 
  2514                              <1> 	;sub	ah, ah
  2515                              <1> 	;mov	[esi+IRQ.owner], ah ; 0 ; free !!!
  2516                              <1> 	;and	byte [esi+IRQ.method], 80h
  2517                              <1> 	;mov	[esi+IRQ.srb], ah ; 0
  2518                              <1> 	;mov	[esi+IRQ.dev], ah ; 0
  2519                              <1> 	;mov	dword [esi+IRQ.addr], 0
  2520                              <1> 	;mov	dword [u.r0], 0
  2521                              <1> 
  2522                              <1> 	;mov	byte [esi+IRQ.owner], 0
  2523                              <1> 
  2524                              <1> 	; 22/04/2017
  2525 0000FE5E 29C0                <1> 	sub	eax, eax
  2526 0000FE60 8886[16550100]      <1> 	mov	[esi+IRQ.owner], al ; 0
  2527 0000FE66 80A6[28550100]80    <1> 	and	byte [esi+IRQ.method], 80h
  2528                              <1> 
  2529                              <1> ;	cmp	byte [esi+IRQ.method], 80h ; device drv or kernel extension ?
  2530                              <1> ;	jb	short scbs_12 ; bh = 0 reset to default IRQ handler
  2531                              <1> ;
  2532                              <1> ;	and	al, al
  2533                              <1> ;	jz	short  scbs_5  ; the caller is 'syscalbac'
  2534                              <1> ;	; The caller is 'sysaudio' or ...
  2535                              <1> ;	sub	al, al
  2536                              <1> ;	mov	[esi+IRQ.method], al ; 0 ; reset kernel extension flag
  2537                              <1> ;scbs_5:
  2538                              <1> ;	sub	ah, ah
  2539                              <1> 	;mov	[u.r0], eax ; 0
  2540 0000FE6D C3                  <1> 	retn	
  2541                              <1> 
  2542                              <1> scbs_6:
  2543                              <1> 	; 14/04/2017
  2544 0000FE6E 20C0                <1> 	and	al, al
  2545 0000FE70 7405                <1> 	jz	short scbs_7  ; the caller is 'syscalbac'
  2546                              <1> 	; AL = user number ([u.uno] or [audio.user] or ...)
  2547                              <1> 	; The caller is 'sysaudio' or ...
  2548                              <1> 	;	
  2549                              <1> 	; bh = method (0 = signal response byte, 1 = callback)
  2550                              <1> 	;	      (2 = auto increment of signal response byte) 
  2551                              <1> 
  2552 0000FE72 80CF80              <1> 	or	bh, 80h		; Kernel extension flag !
  2553 0000FE75 EB0A                <1> 	jmp	short scbs_8
  2554                              <1> scbs_7:	
  2555 0000FE77 8A86[28550100]      <1> 	mov	al, [esi+IRQ.method] ; >= 80h = kernel is using this IRQ
  2556 0000FE7D 2480                <1> 	and	al, 80h ; use only bit 7 (kernel function flag)
  2557 0000FE7F 08C7                <1> 	or	bh, al		 ; method 
  2558                              <1> 				 ; 0 = signal response byte, 1 = callback
  2559                              <1> 				 ; 2 = auto increment of s.r.b.
  2560                              <1> scbs_8:
  2561 0000FE81 A0[4F5D0100]        <1> 	mov	al, [u.uno] ; user (process) number (1 to 16)
  2562 0000FE86 8886[16550100]      <1> 	mov	[esi+IRQ.owner], al ; lock the IRQ for user
  2563 0000FE8C 88BE[28550100]      <1> 	mov	[esi+IRQ.method], bh
  2564                              <1> 
  2565 0000FE92 F6C701              <1> 	test	bh, 1
  2566 0000FE95 7505                <1> 	jnz	short scbs_9 	 ; Callback method, CX will not be used 
  2567                              <1> 			
  2568 0000FE97 F6C702              <1> 	test	bh, 2		 ; use auto increment (counter) method
  2569 0000FE9A 7402                <1> 	jz	short scbs_10	 ; (count can be used for buffer switch)
  2570                              <1> scbs_9:
  2571 0000FE9C 31C9                <1> 	xor	ecx, ecx ; 0
  2572                              <1> scbs_10:			      	
  2573                              <1> 	;mov	[esi+IRQ.method], bh
  2574 0000FE9E 888E[31550100]      <1> 	mov	[esi+IRQ.srb], cl
  2575 0000FEA4 C686[1F550100]00    <1> 	mov	byte [esi+IRQ.dev], 0 ; device number is always 0 
  2576                              <1> 				 ; for this system call
  2577                              <1> 	;test	bh, 1
  2578 0000FEAB 80E701              <1> 	and	bh, 1 ; 17/04/2017
  2579 0000FEAE 7513                <1> 	jnz	short scbs_11	 ; callback method, use virtual address 
  2580                              <1> 
  2581 0000FEB0 53                  <1> 	push	ebx ; IRQ number (in BL)
  2582 0000FEB1 89D3                <1> 	mov	ebx, edx
  2583                              <1> 	; ebx = virtual address
  2584                              <1> 	; [u.pgdir] = page directory's physical address
  2585 0000FEB3 FE05[B6540100]      <1> 	inc	 byte [no_page_swap] ; 1 
  2586                              <1> 			; Do not add this page to swap queue
  2587                              <1> 			; and remove it from swap queue if it is
  2588                              <1> 			; on the queue.
  2589 0000FEB9 E8D053FFFF          <1> 	call	get_physical_addr
  2590 0000FEBE 5B                  <1> 	pop	ebx
  2591 0000FEBF 7283                <1> 	jc	scbs_3 ; invalid address !
  2592                              <1> 	; eax = physical address of the virtual address in user's space
  2593 0000FEC1 89C2                <1> 	mov	edx, eax
  2594                              <1> scbs_11:
  2595 0000FEC3 66C1E602            <1> 	shl	si, 2		; byte (index) to dword (offset)
  2596 0000FEC7 8996[3A550100]      <1> 	mov	[esi+IRQ.addr], edx
  2597                              <1> 
  2598 0000FECD FE05[725D0100]      <1> 	inc	byte [u.irqc]	; increase IRQ (in use) count
  2599                              <1> 
  2600 0000FED3 FEC7                <1> 	inc	 bh ; 17/04/2017
  2601                              <1> 	; bh > 0 -> set to requested IRQ handler (IRQ_u_list)
  2602                              <1> scbs_12:
  2603 0000FED5 88D8                <1> 	mov	al, bl ; IRQ number
  2604 0000FED7 88FC                <1> 	mov	ah, bh ; 0 = reset, >0 = set
  2605 0000FED9 E859F7FFFF          <1> 	call	set_hardware_int_vector
  2606                              <1> 
  2607 0000FEDE 31C0                <1> 	xor	eax, eax
  2608                              <1> 	;mov 	[u.r0], eax ; 0	
  2609                              <1> 
  2610 0000FEE0 C3                  <1> 	retn	; return with success (cf=0, eax=0)
  2611                              <1> 
  2612                              <1> otty:
  2613                              <1> sret:
  2614                              <1> ocvt:
  2615                              <1> ctty:
  2616                              <1> cret:
  2617                              <1> ccvt:
  2618                              <1> rtty:
  2619                              <1> wtty:
  2620                              <1> rmem:
  2621                              <1> wmem:
  2622                              <1> rfd:
  2623                              <1> rhd:
  2624                              <1> wfd:
  2625                              <1> whd:
  2626                              <1> rlpt:
  2627                              <1> wlpt:
  2628                              <1> rcvt:
  2629                              <1> xmtt:
  2630 0000FEE1 C3                  <1> 	retn
  2312                                  %include 'trdosk9.s' ; 04/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - INITIALIZED DATA : trdosk9.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 23/04/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; ----------------------------------------------------------------------------
     9                              <1> ; Assembler: NASM version 2.11 (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 0000FEE2 01                  <1> 		db 1 ; A: = 0 & B: = 1
    22                              <1> 
    23                              <1> Restore_CDIR:	
    24 0000FEE3 FF                  <1> 		db 0FFh ; Initial value -> any number except 0
    25                              <1> 
    26                              <1> msg_CRLF_temp:  
    27 0000FEE4 070D0A00            <1> 		db  07h, 0Dh, 0Ah, 0
    28                              <1> 
    29                              <1> Magic_Bytes:
    30 0000FEE8 04                  <1> 		db 4
    31 0000FEE9 01                  <1> 		db 1
    32                              <1> mainprog_Version:
    33 0000FEEA 07                  <1> 		db 7
    34 0000FEEB 5B5452444F535D204D- <1> 		db "[TRDOS] Main Program v2.0.230417"
    34 0000FEF4 61696E2050726F6772- <1>
    34 0000FEFD 616D2076322E302E32- <1>
    34 0000FF06 3330343137          <1>
    35 0000FF0B 0D0A                <1> 		db 0Dh, 0Ah
    36 0000FF0D 286329204572646F67- <1> 		db "(c) Erdogan Tan 2005-2017"
    36 0000FF16 616E2054616E203230- <1>
    36 0000FF1F 30352D32303137      <1>
    37 0000FF26 0D0A00              <1> 		db 0Dh, 0Ah, 0
    38                              <1> 
    39                              <1> MainProgCfgFile: ; 14/04/2016
    40 0000FF29 4D41494E50524F472E- <1> 		db "MAINPROG.CFG", 0
    40 0000FF32 43464700            <1>
    41                              <1> 
    42                              <1> TRDOSPromptLabel:
    43 0000FF36 5452444F53          <1> 		db "TRDOS"
    44 0000FF3B 00                  <1> 		db 0
    45 0000FF3C 00<rept>            <1>                 times 5 db 0
    46 0000FF41 00                  <1> 		db 0
    47                              <1> 
    48                              <1> ; INTERNAL COMMANDS
    49                              <1> Command_List:
    50 0000FF42 44495200            <1> Cmd_Dir:	db "DIR", 0
    51 0000FF46 434400              <1> Cmd_Cd:		db "CD", 0
    52 0000FF49 433A00              <1> Cmd_Drive:	db "C:", 0
    53 0000FF4C 56455200            <1> Cmd_Ver:	db "VER", 0
    54 0000FF50 4558495400          <1> Cmd_Exit:	db "EXIT", 0
    55 0000FF55 50524F4D505400      <1> Cmd_Prompt:	db "PROMPT", 0
    56 0000FF5C 564F4C554D4500      <1> Cmd_Volume:	db "VOLUME", 0
    57 0000FF63 4C4F4E474E414D4500  <1> Cmd_LongName:	db "LONGNAME", 0
    58 0000FF6C 4441544500          <1> Cmd_Date:	db "DATE", 0
    59 0000FF71 54494D4500          <1> Cmd_Time:	db "TIME", 0
    60 0000FF76 52554E00            <1> Cmd_Run:	db "RUN", 0
    61 0000FF7A 53455400            <1> Cmd_Set:	db "SET", 0 
    62 0000FF7E 434C5300            <1> Cmd_Cls:	db "CLS", 0
    63 0000FF82 53484F5700          <1> Cmd_Show:	db "SHOW", 0
    64 0000FF87 44454C00            <1> Cmd_Del:	db "DEL", 0
    65 0000FF8B 41545452494200      <1> Cmd_Attrib:	db "ATTRIB", 0
    66 0000FF92 52454E414D4500      <1> Cmd_Rename:	db "RENAME", 0
    67 0000FF99 524D44495200        <1> Cmd_Rmdir:	db "RMDIR", 0
    68 0000FF9F 4D4B44495200        <1> Cmd_Mkdir:	db "MKDIR", 0
    69 0000FFA5 434F505900          <1> Cmd_Copy:	db "COPY", 0
    70 0000FFAA 4D4F564500          <1> Cmd_Move:	db "MOVE", 0
    71 0000FFAF 5041544800          <1> Cmd_Path:	db "PATH", 0
    72 0000FFB4 4D454D00            <1> Cmd_Mem:	db "MEM", 0
    73 0000FFB8 00                  <1> 		db 0
    74 0000FFB9 46494E4400          <1> Cmd_Find:	db "FIND", 0
    75 0000FFBE 4543484F00          <1> Cmd_Echo:	db "ECHO", 0
    76 0000FFC3 2A00                <1> Cmd_Remark:	db "*", 0
    77 0000FFC5 3F00                <1> Cmd_Help:	db "?", 0
    78 0000FFC7 44455649434500      <1> Cmd_Device:	db "DEVICE", 0
    79 0000FFCE 4445564C49535400    <1> Cmd_DevList:	db "DEVLIST", 0
    80 0000FFD6 434844495200        <1> Cmd_Chdir:	db "CHDIR", 0
    81 0000FFDC 4245455000          <1> Cmd_Beep:	db "BEEP", 0
    82                              <1> 		
    83 0000FFE1 00                  <1> 		db 0
    84                              <1> 
    85                              <1> ; 15/02/2016 (FILE.ASM, 09/10/2011)
    86                              <1> invalid_fname_chars:
    87 0000FFE2 222728292A2B2C2F    <1> 		db 22h, 27h, 28h, 29h, 2Ah, 2Bh, 2Ch, 2Fh
    88 0000FFEA 3A3B3C3D3E3F40      <1> 		db 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh, 40h
    89 0000FFF1 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 0000FFF6 456E746572206E6577- <1>                 db 'Enter new date (dd-mm-yy): '
    94 0000FFFF 206461746520286464- <1>
    94 00010008 2D6D6D2D7979293A20  <1>
    95 00010011 00                  <1>                 db 0
    96                              <1> Msg_Show_Date:
    97 00010012 43757272656E742064- <1>                 db   'Current date is '
    97 0001001B 61746520697320      <1>
    98 00010022 30                  <1> Day:            db   '0'
    99 00010023 30                  <1> 		db   '0'
   100 00010024 2F                  <1>                 db   '/'
   101 00010025 30                  <1> Month:          db   '0'
   102 00010026 30                  <1> 		db   '0'
   103 00010027 2F                  <1>                 db   '/'
   104 00010028 30                  <1> Century:        db   '0'
   105 00010029 30                  <1>                 db   '0'
   106 0001002A 30                  <1> Year:           db   '0'
   107 0001002B 30                  <1> 		db   '0'
   108 0001002C 0D0A00              <1>                 db   0Dh, 0Ah, 0
   109                              <1> 
   110                              <1> Msg_Enter_Time:
   111 0001002F 456E746572206E6577- <1> 		db 'Enter new time: '
   111 00010038 2074696D653A20      <1>
   112 0001003F 00                  <1> 		db 0
   113                              <1> Msg_Show_Time:
   114 00010040 43757272656E742074- <1> 		db   'Current time is '
   114 00010049 696D6520697320      <1>
   115 00010050 30                  <1> Hour:           db   '0'
   116 00010051 30                  <1> 		db   '0'
   117 00010052 3A                  <1> 		db   ':'
   118 00010053 30                  <1> Minute:         db   '0'
   119 00010054 30                  <1> 		db   '0'
   120 00010055 3A                  <1> 		db   ':'
   121 00010056 30                  <1> Second:         db   '0'
   122 00010057 30                  <1> 		db   '0'
   123 00010058 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 0001005B 206B696C6F62797465- <1> 		db " kilobytes", 0Dh, 0Ah, 0
   129 00010064 730D0A00            <1>
   130                              <1> VolSize_Bytes:
   131 00010068 2062797465730D0A00  <1> 		db " bytes", 0Dh, 0Ah, 0
   132                              <1> Volume_in_drive:
   133 00010071 0D0A                <1> 		db 0Dh, 0Ah
   134                              <1> Vol_FS_Name:
   135 00010073 54522046533120      <1> 		db "TR FS1 "
   136 0001007A 566F6C756D6520696E- <1> 		db "Volume in drive "
   136 00010083 20647269766520      <1>
   137 0001008A 30                  <1> Vol_Drv_Name:   db 30h
   138 0001008B 3A                  <1> 		db ":"
   139 0001008C 20697320            <1> 		db " is "
   140 00010090 0D0A00              <1> 		db 0Dh, 0Ah, 0
   141                              <1> Dir_Drive_Str:
   142 00010093 54522D444F53204472- <1>                 db "TR-DOS Drive "
   142 0001009C 69766520            <1>
   143                              <1> Dir_Drive_Name:
   144 000100A0 303A                <1>                 db "0:"
   145 000100A2 0D0A                <1>                 db  0Dh, 0Ah
   146                              <1> Vol_Str_Header:
   147 000100A4 566F6C756D65204E61- <1>                 db "Volume Name: "
   147 000100AD 6D653A20            <1>
   148                              <1> Vol_Name:
   149 000100B1 00<rept>            <1> 		times 64 db 0
   150 000100F1 00                  <1> 		db 0
   151                              <1> Vol_Serial_Header:
   152 000100F2 0D0A                <1> 		db 0Dh, 0Ah
   153 000100F4 566F6C756D65205365- <1> 		db "Volume Serial No: "
   153 000100FD 7269616C204E6F3A20  <1>
   154                              <1> Vol_Serial1:
   155 00010106 30303030            <1> 		db "0000"
   156 0001010A 2D                  <1> 		db "-"
   157                              <1> Vol_Serial2:
   158 0001010B 30303030            <1> 		db "0000"
   159 0001010F 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 00010112 0D0A                <1> 		db 0Dh, 0Ah
   165 00010114 566F6C756D65205369- <1> 		db "Volume Size : ", 0
   165 0001011D 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 00010123 467265652053706163- <1> 		db "Free Space  : ", 0
   173 0001012C 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 00010132 4469726563746F7279- <1>                 db "Directory: "
   180 0001013B 3A20                <1>
   181 0001013D 2F                  <1> Dir_Str_Root:   db "/"
   182 0001013E 00<rept>            <1> Dir_Str:        times 64 db 0
   183 0001017E 00000000            <1>                 dd 0
   184 00010182 00                  <1>                 db 0
   185                              <1> 
   186                              <1> Msg_Bad_Command:
   187 00010183 42616420636F6D6D61- <1>                 db "Bad command or file name!"
   187 0001018C 6E64206F722066696C- <1>
   187 00010195 65206E616D6521      <1>
   188 0001019C 0D0A00              <1>                 db 0Dh, 0Ah, 0
   189                              <1> 
   190                              <1> msgl_drv_not_ready: 
   191 0001019F 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 000101A2 4472697665206E6F74- <1>                 db "Drive not ready or read error!"
   196 000101AB 207265616479206F72- <1>
   196 000101B4 207265616420657272- <1>
   196 000101BD 6F7221              <1>
   197 000101C0 0D0A00              <1>                 db 0Dh, 0Ah, 0
   198                              <1> 
   199                              <1> Msg_Not_Ready_Write_Err:
   200 000101C3 4472697665206E6F74- <1>                 db "Drive not ready or write error!"
   200 000101CC 207265616479206F72- <1>
   200 000101D5 207772697465206572- <1>
   200 000101DE 726F7221            <1>
   201 000101E2 0D0A00              <1>                 db 0Dh, 0Ah, 0
   202                              <1> 
   203                              <1> Msg_Dir_Not_Found:
   204 000101E5 4469726563746F7279- <1>                 db "Directory not found!"
   204 000101EE 206E6F7420666F756E- <1>
   204 000101F7 6421                <1>
   205 000101F9 0D0A00              <1>                 db 0Dh, 0Ah, 0
   206                              <1> 
   207                              <1> Msg_File_Not_Found:
   208 000101FC 46696C65206E6F7420- <1>                 db "File not found!"
   208 00010205 666F756E6421        <1>
   209 0001020B 0D0A00              <1>                 db 0Dh, 0Ah, 0
   210                              <1> 
   211                              <1> Msg_File_Directory_Not_Found:
   212 0001020E 46696C65206F722064- <1>                 db "File or directory not found!"
   212 00010217 69726563746F727920- <1>
   212 00010220 6E6F7420666F756E64- <1>
   212 00010229 21                  <1>
   213 0001022A 0D0A00              <1>                 db 0Dh, 0Ah, 0
   214                              <1> 
   215                              <1> Msg_LongName_Not_Found:
   216 0001022D 4C6F6E67206E616D65- <1>                 db "Long name not found!"
   216 00010236 206E6F7420666F756E- <1>
   216 0001023F 6421                <1>
   217 00010241 0D0A00              <1>                 db 0Dh, 0Ah, 0
   218                              <1> 
   219                              <1> beep_Insufficient_Memory: ; 20/02/2017
   220 00010244 0D0A                <1> 		db 0Dh, 0Ah
   221 00010246 07                  <1> 		db 07h
   222                              <1> Msg_Insufficient_Memory:
   223 00010247 496E73756666696369- <1>                 db "Insufficient memory!"
   223 00010250 656E74206D656D6F72- <1>
   223 00010259 7921                <1>
   224 0001025B 0D0A00              <1>                 db 0Dh, 0Ah, 0
   225                              <1> 
   226                              <1> Msg_Error_Code:
   227 0001025E 436F6D6D616E642066- <1>                 db 'Command failed! Error code : '
   227 00010267 61696C656421204572- <1>
   227 00010270 726F7220636F646520- <1>
   227 00010279 3A20                <1>
   228 0001027B 303068              <1> error_code_hex: db '00h'
   229 0001027E 0A0A00              <1>                 db 0Ah, 0Ah, 0
   230                              <1> 
   231 00010281 90                  <1> align 2
   232                              <1> 
   233                              <1> ; 10/02/2016
   234                              <1> ; DIR.ASM - 09/10/2011
   235                              <1> 
   236 00010282 3C4449523E20202020- <1> Type_Dir:       db '<DIR>     ' ; 10 bytes
   236 0001028B 20                  <1>
   237                              <1> 
   238                              <1> File_Name:
   239 0001028C 20<rept>            <1>                 times 12 db 20h
   240 00010298 20                  <1> 		db 20h
   241                              <1> Dir_Or_FileSize:
   242 00010299 20<rept>            <1>                 times 10 db 20h
   243 000102A3 20                  <1> 		db 20h
   244                              <1> File_Attribute:
   245 000102A4 20202020            <1> 		dd 20202020h
   246 000102A8 20                  <1> 		db 20h
   247                              <1> File_Day:
   248 000102A9 3030                <1>                 db '0','0'
   249 000102AB 2F                  <1> 		db '/'
   250                              <1> File_Month:
   251 000102AC 3030                <1>                 db '0','0'
   252 000102AE 2F                  <1> 		db '/'
   253                              <1> File_Year:
   254 000102AF 30303030            <1>                 db '0','0','0','0'
   255 000102B3 20                  <1> 		db 20h
   256                              <1> File_Hour:
   257 000102B4 3030                <1>                 db '0','0'
   258 000102B6 3A                  <1> 		db ':'
   259                              <1> File_Minute:
   260 000102B7 3030                <1>                 db '0','0'
   261 000102B9 00                  <1> 		db 0
   262                              <1> 
   263                              <1> Decimal_File_Count_Header:
   264 000102BA 0D0A                <1> 		db 0Dh, 0Ah
   265                              <1> Decimal_File_Count:
   266 000102BC 00<rept>            <1> 		times 6 db 0
   267                              <1> 
   268 000102C2 2066696C6528732920- <1> str_files:	db " file(s) & "
   268 000102CB 2620                <1>
   269                              <1> Decimal_Dir_Count: 
   270 000102CD 00<rept>            <1> 		times 6 db 0
   271                              <1> str_dirs:       
   272 000102D3 206469726563746F72- <1> 		db " directory(s) "
   272 000102DC 7928732920          <1>
   273 000102E1 0D0A00              <1> 		db 0Dh, 0Ah, 0
   274                              <1> 
   275 000102E4 206279746528732920- <1> str_bytes:	db " byte(s) in file(s)"
   275 000102ED 696E2066696C652873- <1>
   275 000102F6 29                  <1>
   276 000102F7 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 000102FA 496E76616C69642066- <1>                 db "Invalid file or directory name characters!"
   281 00010303 696C65206F72206469- <1>
   281 0001030C 726563746F7279206E- <1>
   281 00010315 616D65206368617261- <1>
   281 0001031E 637465727321        <1>
   282 00010324 0D0A00              <1>         	db 0Dh, 0Ah, 0
   283                              <1> ; 21/02/2016
   284 00010327 46696C65206F722064- <1> Msg_Name_Exists: db "File or directory name exists!"
   284 00010330 69726563746F727920- <1>
   284 00010339 6E616D652065786973- <1>
   284 00010342 747321              <1>
   285 00010345 0D0A00              <1>                 db 0Dh, 0Ah, 0
   286                              <1> Msg_DoYouWantMkdir:
   287 00010348 446F20796F75207761- <1>                 db "Do you want to make directory ", 0
   287 00010351 6E7420746F206D616B- <1>
   287 0001035A 65206469726563746F- <1>
   287 00010363 72792000            <1>
   288 00010367 2028592F4E29203F20- <1> Msg_YesNo:      db " (Y/N) ? ", 0  
   288 00010370 00                  <1>
   289 00010371 000D0A00            <1> Y_N_nextline:	db 0, 0Dh, 0Ah, 0 
   290 00010375 4F4B2E0D0A00        <1> Msg_OK:		db "OK.", 0Dh, 0Ah, 0
   291                              <1> 
   292                              <1> ; 27/02/2016
   293                              <1> Msg_DoYouWantRmDir:
   294 0001037B 446F20796F75207761- <1>                 db "Do you want to delete directory ", 0
   294 00010384 6E7420746F2064656C- <1>
   294 0001038D 657465206469726563- <1>
   294 00010396 746F72792000        <1>
   295                              <1> Msg_Dir_Not_Empty:
   296 0001039C 4469726563746F7279- <1>                 db "Directory not empty!"
   296 000103A5 206E6F7420656D7074- <1>
   296 000103AE 7921                <1>
   297 000103B0 0D0A00              <1>                 db 0Dh, 0Ah, 0
   298                              <1> 
   299                              <1> Msg_DoYouWantDelete:
   300 000103B3 446F20796F75207761- <1>                 db "Do you want to delete file ",0
   300 000103BC 6E7420746F2064656C- <1>
   300 000103C5 6574652066696C6520- <1>
   300 000103CE 00                  <1>
   301                              <1> 
   302 000103CF 44656C657465642E2E- <1> Msg_Deleted:    db "Deleted...", 0Dh, 0Ah, 0
   302 000103D8 2E0D0A00            <1>
   303                              <1> 
   304                              <1> Msg_Permission_Denied:
   305 000103DC 07                  <1>                 db 7
   306 000103DD 5065726D697373696F- <1>                 db "Permission denied!", 0Dh, 0Ah, 0
   306 000103E6 6E2064656E69656421- <1>
   306 000103EF 0D0A00              <1>
   307                              <1> 
   308                              <1> ; 04/03/2016
   309 000103F2 4E657720            <1> Msg_New:        db "New "
   310 000103F6 00                  <1>                 db 0
   311                              <1> Str_Attributes:
   312 000103F7 417474726962757465- <1>                 db "Attributes : "
   312 00010400 73203A20            <1>
   313 00010404 4E4F524D414C        <1> Attr_Chars:     db "NORMAL"
   314 0001040A 00                  <1>                 db 0
   315                              <1> 
   316                              <1> ; 06/03/2016
   317                              <1> ; CMD_INTR.ASM - 16/11/2010 
   318                              <1> Msg_DoYouWantRename:
   319 0001040B 446F20796F75207761- <1>                 db "Do you want to rename ", 0
   319 00010414 6E7420746F2072656E- <1>
   319 0001041D 616D652000          <1>
   320 00010422 66696C652000        <1> Rename_File:    db "file ", 0
   321 00010428 6469726563746F7279- <1> Rename_Directory: db "directory ", 0
   321 00010431 2000                <1>
   322 00010433 00<rept>            <1> Rename_OldName: times 13 db 0
   323 00010440 20617320            <1> Msg_File_rename_as: db " as "
   324 00010444 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 00010451 4E6F742073616D6520- <1>                 db "Not same drive!" 
   329 0001045A 647269766521        <1>
   330 00010460 0D0A00              <1>                 db 0Dh, 0Ah, 0 
   331                              <1> 
   332                              <1> Msg_DoYouWantMoveFile:
   333 00010463 446F20796F75207761- <1>                 db "Do you want to move file", 0
   333 0001046C 6E7420746F206D6F76- <1>
   333 00010475 652066696C6500      <1>
   334                              <1> 
   335                              <1> msg_insufficient_disk_space:
   336 0001047C 496E73756666696369- <1>                 db "Insufficient disk space!" 
   336 00010485 656E74206469736B20- <1>
   336 0001048E 737061636521        <1>
   337 00010494 0D0A00              <1>                 db 0Dh, 0Ah, 0
   338                              <1> 
   339                              <1> ; 01/08/2010
   340                              <1> msg_source_file: 
   341 00010497 0D0A536F7572636520- <1> 		db 0Dh, 0Ah, "Source file name      :   "
   341 000104A0 66696C65206E616D65- <1>
   341 000104A9 2020202020203A2020- <1>
   341 000104B2 20                  <1>
   342                              <1> msg_source_file_drv: 
   343 000104B3 203A00              <1> 		db " :", 0
   344                              <1> msg_destination_file: 
   345 000104B6 0D0A44657374696E61- <1> 		db 0Dh, 0Ah, "Destination file name :   "
   345 000104BF 74696F6E2066696C65- <1>
   345 000104C8 206E616D65203A2020- <1>
   345 000104D1 20                  <1>
   346                              <1> msg_destination_file_drv: 
   347 000104D2 203A00              <1> 		db " :", 0
   348                              <1> msg_copy_nextline: 
   349 000104D5 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 000104D8 446F20796F75207761- <1>                 db "Do you want to overwrite file ",0
   355 000104E1 6E7420746F206F7665- <1>
   355 000104EA 727772697465206669- <1>
   355 000104F3 6C652000            <1>
   356                              <1>   
   357                              <1> Msg_DoYouWantCopyFile:
   358 000104F7 446F20796F75207761- <1>                 db "Do you want to copy file",0
   358 00010500 6E7420746F20636F70- <1>
   358 00010509 792066696C6500      <1>
   359                              <1> 
   360                              <1> Msg_read_file_error_before_EOF:
   361 00010510 46696C652072656164- <1> 		db "File reading error! (before EOF)"
   361 00010519 696E67206572726F72- <1>
   361 00010522 2120286265666F7265- <1>
   361 0001052B 20454F4629          <1>
   362 00010530 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 00010533 52656164696E672E2E- <1> 		db "Reading... ", 0
   367 0001053C 2E2000              <1>
   368                              <1> msg_writing:
   369 0001053F 57726974696E672E2E- <1> 		db "Writing... ", 0
   369 00010548 2E2000              <1>
   370                              <1> percentagestr:
   371 0001054B 2020202500          <1> 		db "   %", 0  ; "  0%" .. "100%"
   372                              <1> ; 11/04/2016
   373                              <1> Msg_No_Set_Space:
   374 00010550 496E73756666696369- <1>                 db "Insufficient environment space!"
   374 00010559 656E7420656E766972- <1>
   374 00010562 6F6E6D656E74207370- <1>
   374 0001056B 61636521            <1>
   375 0001056F 0D0A00              <1>                 db 0Dh, 0Ah, 0
   376                              <1> ; 18/04/2016
   377                              <1> isc_msg:	
   378 00010572 0D0A                <1> 		db 0Dh, 0Ah
   379 00010574 494E56414C49442053- <1> 		db "INVALID SYSTEM CALL", 0
   379 0001057D 595354454D2043414C- <1>
   379 00010586 4C00                <1>
   380                              <1> usi_msg:
   381 00010588 0D0A                <1> 		db 0Dh, 0Ah
   382 0001058A 554E444546494E4544- <1> 		db "UNDEFINED SOFTWARE INTERRUPT", 0
   382 00010593 20534F465457415245- <1>
   382 0001059C 20494E544552525550- <1>
   382 000105A5 5400                <1>
   383                              <1> ifc_msg:
   384 000105A7 0D0A                <1> 		db 0Dh, 0Ah
   385 000105A9 494E56414C49442046- <1> 		db "INVALID FUNCTION CALL"
   385 000105B2 554E4354494F4E2043- <1>
   385 000105BB 414C4C              <1>
   386                              <1> inv_msg_for_trdos_v2:
   387 000105BE 20                  <1> 		db 20h
   388 000105BF 666F72205452444F53- <1> 		db "for TRDOS v2!"
   388 000105C8 20763221            <1>
   389 000105CC 07                  <1> 		db 07h
   390 000105CD 0D0A                <1> 		db 0Dh, 0Ah
   391 000105CF 0D0A                <1> 		db 0Dh, 0Ah
   392 000105D1 494E5420            <1> 		db "INT "
   393 000105D5 303068              <1> int_num_str:	db "00h"
   394 000105D8 0D0A                <1> 		db 0Dh, 0Ah
   395 000105DA 454158203A20        <1> 		db "EAX : "
   396 000105E0 303030303030303068- <1> eax_str:	db "00000000h", 0Dh, 0Ah
   396 000105E9 0D0A                <1>
   397 000105EB 454950203A20        <1> 		db "EIP : "
   398 000105F1 303030303030303068- <1> eip_str:	db "00000000h", 0Dh, 0Ah, 0
   398 000105FA 0D0A00              <1>
   399                              <1> 
   400                              <1> ; 07/10/2016
   401                              <1> ; Device names & parameters (for kernel devices)
   402                              <1> 
   403 000105FD 90                  <1> align 2
   404                              <1> KDEV_NAME:
   405 000105FE 5454590000000000    <1> 		db 'TTY',0,0,0,0,0 ; 1
   406 00010606 4D454D0000000000    <1> 		db 'MEM',0,0,0,0,0 ; 2
   407 0001060E 4644300000000000    <1> 		db 'FD0',0,0,0,0,0 ; 3
   408 00010616 4644310000000000    <1> 		db 'FD1',0,0,0,0,0 ; 4
   409 0001061E 4844300000000000    <1> 		db 'HD0',0,0,0,0,0 ; 5
   410 00010626 4844310000000000    <1> 		db 'HD1',0,0,0,0,0 ; 6
   411 0001062E 4844320000000000    <1> 		db 'HD2',0,0,0,0,0 ; 7
   412 00010636 4844330000000000    <1> 		db 'HD3',0,0,0,0,0 ; 8
   413 0001063E 4C50540000000000    <1> 		db 'LPT',0,0,0,0,0 ; 9
   414 00010646 5454593000000000    <1> 		db 'TTY0',0,0,0,0 ; 10
   415 0001064E 5454593100000000    <1> 		db 'TTY1',0,0,0,0 ; 11
   416 00010656 5454593200000000    <1> 		db 'TTY2',0,0,0,0 ; 12
   417 0001065E 5454593300000000    <1> 		db 'TTY3',0,0,0,0 ; 13
   418 00010666 5454593400000000    <1> 		db 'TTY4',0,0,0,0 ; 14
   419 0001066E 5454593500000000    <1> 		db 'TTY5',0,0,0,0 ; 15
   420 00010676 5454593600000000    <1> 		db 'TTY6',0,0,0,0 ; 16
   421 0001067E 5454593700000000    <1> 		db 'TTY7',0,0,0,0 ; 17
   422 00010686 5454593800000000    <1> 		db 'TTY8',0,0,0,0 ; 18
   423 0001068E 5454593900000000    <1> 		db 'TTY9',0,0,0,0 ; 19
   424 00010696 434F4D3100000000    <1> 		db 'COM1',0,0,0,0 ; 18
   425 0001069E 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 000106A6 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 000106AE 010203040506070809  <1> 		db 1,2,3,4,5,6,7,8,9
   468 000106B7 0A0B0C0D0E0F101112- <1> 		db 10,11,12,13,14,15,16,17,18,19
   468 000106C0 13                  <1>
   469 000106C1 121300              <1> 		db 18,19,0
   470                              <1> 
   471                              <1> NumOfKernelDevices equ $ - KDEV_NUMBER
   472                              <1> 
   473                              <1> KDEV_OADDR:
   474 000106C4 [E1FE0000]          <1> 		dd otty ;tty  ; 1
   475 000106C8 [E1FE0000]          <1> 		dd sret ;mem  ; 2
   476 000106CC [E1FE0000]          <1>  		dd sret ;fd0  ; 3
   477 000106D0 [E1FE0000]          <1>  		dd sret ;fd1  ; 4
   478 000106D4 [E1FE0000]          <1>  		dd sret ;hd0  ; 5
   479 000106D8 [E1FE0000]          <1>  		dd sret ;hd1  ; 6
   480 000106DC [E1FE0000]          <1>  		dd sret ;hd2  ; 7
   481 000106E0 [E1FE0000]          <1>  		dd sret ;hd3  ; 8
   482 000106E4 [E1FE0000]          <1>  		dd sret ;lpt  ; 9
   483 000106E8 [E1FE0000]          <1>  		dd ocvt ;tty0 ; 10
   484 000106EC [E1FE0000]          <1> 		dd ocvt ;tty1 ; 11
   485 000106F0 [E1FE0000]          <1>  		dd ocvt ;tty2 ; 12
   486 000106F4 [E1FE0000]          <1>  		dd ocvt ;tty3 ; 13
   487 000106F8 [E1FE0000]          <1>  		dd ocvt ;tty4 ; 14
   488 000106FC [E1FE0000]          <1>  		dd ocvt ;tty5 ; 15
   489 00010700 [E1FE0000]          <1>  		dd ocvt ;tty6 ; 16
   490 00010704 [E1FE0000]          <1>  		dd ocvt ;tty7 ; 17
   491 00010708 [E1FE0000]          <1>  		dd ocvt ;tty8 ; 18
   492 0001070C [E1FE0000]          <1>  		dd ocvt ;tty9 ; 19
   493                              <1>  		;dd ocvt ;com1 ; 18
   494                              <1>  		;dd ocvt ;com2 ; 19
   495 00010710 [E1FE0000]          <1> 		dd sret ;null ; 20  
   496                              <1> KDEV_CADDR:
   497 00010714 [E1FE0000]          <1> 		dd ctty ;tty  ; 1
   498 00010718 [E1FE0000]          <1> 		dd cret ;mem  ; 2
   499 0001071C [E1FE0000]          <1>  		dd cret ;fd0  ; 3
   500 00010720 [E1FE0000]          <1>  		dd cret ;fd1  ; 4
   501 00010724 [E1FE0000]          <1>  		dd cret ;hd0  ; 5
   502 00010728 [E1FE0000]          <1>  		dd cret ;hd1  ; 6
   503 0001072C [E1FE0000]          <1>  		dd cret ;hd2  ; 7
   504 00010730 [E1FE0000]          <1>  		dd cret ;hd3  ; 8
   505 00010734 [E1FE0000]          <1>  		dd cret ;lpt  ; 9
   506 00010738 [E1FE0000]          <1>  		dd ocvt ;tty0 ; 10
   507 0001073C [E1FE0000]          <1> 		dd ccvt ;tty1 ; 11
   508 00010740 [E1FE0000]          <1>  		dd ccvt ;tty2 ; 12
   509 00010744 [E1FE0000]          <1>  		dd ccvt ;tty3 ; 13
   510 00010748 [E1FE0000]          <1>  		dd ccvt ;tty4 ; 14
   511 0001074C [E1FE0000]          <1>  		dd ccvt ;tty5 ; 15
   512 00010750 [E1FE0000]          <1>  		dd ccvt ;tty6 ; 16
   513 00010754 [E1FE0000]          <1>  		dd ccvt ;tty7 ; 17
   514 00010758 [E1FE0000]          <1>  		dd ccvt ;tty8 ; 18
   515 0001075C [E1FE0000]          <1>  		dd ccvt ;tty9 ; 19
   516                              <1>  		;dd ccvt ;com1 ; 18
   517                              <1>  		;dd ccvt ;com2 ; 19
   518 00010760 [E1FE0000]          <1> 		dd cret ;null ; 20
   519                              <1> 
   520                              <1> KDEV_RADDR:
   521 00010764 [E1FE0000]          <1> 		dd rtty ;tty  ; 1
   522 00010768 [E1FE0000]          <1> 		dd rmem ;mem  ; 2
   523 0001076C [E1FE0000]          <1>  		dd rfd  ;fd0  ; 3
   524 00010770 [E1FE0000]          <1>  		dd rfd  ;fd1  ; 4
   525 00010774 [E1FE0000]          <1>  		dd rhd  ;hd0  ; 5
   526 00010778 [E1FE0000]          <1>  		dd rhd  ;hd1  ; 6
   527 0001077C [E1FE0000]          <1>  		dd rhd  ;hd2  ; 7
   528 00010780 [E1FE0000]          <1>  		dd rhd  ;hd3  ; 8
   529 00010784 [E1FE0000]          <1>  		dd rlpt ;lpt  ; 9
   530 00010788 [E1FE0000]          <1>  		dd rcvt ;tty0 ; 10
   531 0001078C [E1FE0000]          <1> 		dd rcvt ;tty1 ; 11
   532 00010790 [E1FE0000]          <1>  		dd rcvt ;tty2 ; 12
   533 00010794 [E1FE0000]          <1>  		dd rcvt ;tty3 ; 13
   534 00010798 [E1FE0000]          <1>  		dd rcvt ;tty4 ; 14
   535 0001079C [E1FE0000]          <1>  		dd rcvt ;tty5 ; 15
   536 000107A0 [E1FE0000]          <1>  		dd rcvt ;tty6 ; 16
   537 000107A4 [E1FE0000]          <1>  		dd rcvt ;tty7 ; 17
   538 000107A8 [E1FE0000]          <1>  		dd rcvt ;tty8 ; 18
   539 000107AC [E1FE0000]          <1>  		dd rcvt ;tty9 ; 19
   540                              <1>  		;dd rcvt ;com1 ; 18
   541                              <1>  		;dd rcvt ;com2 ; 19
   542 000107B0 [B5F90000]          <1> 		dd rnull ;null ; 20  
   543                              <1> KDEV_WADDR:
   544 000107B4 [E1FE0000]          <1> 		dd wtty ;tty  ; 1
   545 000107B8 [E1FE0000]          <1> 		dd wmem ;mem  ; 2
   546 000107BC [E1FE0000]          <1>  		dd wfd  ;fd0  ; 3
   547 000107C0 [E1FE0000]          <1>  		dd wfd  ;fd1  ; 4
   548 000107C4 [E1FE0000]          <1>  		dd whd  ;hd0  ; 5
   549 000107C8 [E1FE0000]          <1>  		dd whd  ;hd1  ; 6
   550 000107CC [E1FE0000]          <1>  		dd whd  ;hd2  ; 7
   551 000107D0 [E1FE0000]          <1>  		dd whd  ;hd3  ; 8
   552 000107D4 [E1FE0000]          <1>  		dd wlpt ;lpt  ; 9
   553 000107D8 [E1FE0000]          <1>  		dd xmtt ;tty0 ; 10
   554 000107DC [E1FE0000]          <1> 		dd xmtt ;tty1 ; 11
   555 000107E0 [E1FE0000]          <1>  		dd xmtt ;tty2 ; 12
   556 000107E4 [E1FE0000]          <1>  		dd xmtt ;tty3 ; 13
   557 000107E8 [E1FE0000]          <1>  		dd xmtt ;tty4 ; 14
   558 000107EC [E1FE0000]          <1>  		dd xmtt ;tty5 ; 15
   559 000107F0 [E1FE0000]          <1>  		dd xmtt ;tty6 ; 16
   560 000107F4 [E1FE0000]          <1>  		dd xmtt ;tty7 ; 17
   561 000107F8 [E1FE0000]          <1>  		dd xmtt ;tty8 ; 18
   562 000107FC [E1FE0000]          <1>  		dd xmtt ;tty9 ; 19
   563                              <1>  		;dd xmtt ;com1 ; 18
   564                              <1>  		;dd xmtt ;com2 ; 19
   565 00010800 [B6F90000]          <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 00010804 07                  <1> 		db  00000111b	; tty, 1
   579 00010805 07                  <1> 		db  00000111b	; mem, 2	
   580 00010806 8F                  <1> 		db  10001111b	; fd0, 3	
   581 00010807 8F                  <1> 		db  10001111b	; fd1, 4
   582 00010808 8F                  <1> 		db  10001111b	; hd0, 5
   583 00010809 8F                  <1> 		db  10001111b	; hd1, 6
   584 0001080A 8F                  <1> 		db  10001111b	; hd2, 7
   585 0001080B 8F                  <1> 		db  10001111b	; hd3, 8
   586 0001080C 07                  <1> 		db  00000111b   ; lpt, 9
   587 0001080D 07                  <1> 		db  00000111b	; tty0, 10
   588 0001080E 07                  <1> 		db  00000111b	; tty1, 11
   589 0001080F 07                  <1> 		db  00000111b	; tty2, 12
   590 00010810 07                  <1> 		db  00000111b	; tty3, 13
   591 00010811 07                  <1> 		db  00000111b	; tty4, 14
   592 00010812 07                  <1> 		db  00000111b	; tty5, 15
   593 00010813 07                  <1> 		db  00000111b	; tty6, 16
   594 00010814 07                  <1> 		db  00000111b	; tty7, 17
   595 00010815 07                  <1> 		db  00000111b	; tty8, 18
   596 00010816 07                  <1> 		db  00000111b	; tty9, 19
   597                              <1> 		;db 00000111b	; com1, 18
   598                              <1> 		;db 00000111b	; com2, 19
   599 00010817 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 00010818 000000010203000400- <1> 	db  0,0,0,1,2,3,0,4,0,5,6,7,8,9,0,0	
   615 00010821 05060708090000      <1>
  2313                                  
  2314                                  ; 27/08/2014
  2315                                  scr_row:
  2316 00010828 E0810B00                	dd 0B8000h + 0A0h + 0A0h + 0A0h ; Row 3
  2317                                  scr_col:
  2318 0001082C 00000000                	dd 0
  2319                                  
  2320                                  Align 4
  2321                                  	; 15/04/2016
  2322                                  	; TRDOS 386 (TRDOS v2.0)
  2323                                  
  2324                                  	; 21/08/2014
  2325                                  ilist:
  2326                                  	;times 	32 dd cpu_except ; INT 0 to INT 1Fh
  2327                                  	;
  2328                                  	; Exception list
  2329                                  	; 25/08/2014	
  2330 00010830 [17090000]              	dd	exc0	; 0h,  Divide-by-zero Error
  2331 00010834 [1E090000]              	dd	exc1	
  2332 00010838 [25090000]              	dd 	exc2	
  2333 0001083C [2C090000]              	dd	exc3	
  2334 00010840 [30090000]              	dd	exc4	
  2335 00010844 [34090000]              	dd	exc5	
  2336 00010848 [38090000]              	dd 	exc6	; 06h,  Invalid Opcode
  2337 0001084C [3C090000]              	dd	exc7	
  2338 00010850 [40090000]              	dd	exc8	
  2339 00010854 [44090000]              	dd	exc9	
  2340 00010858 [48090000]              	dd 	exc10	
  2341 0001085C [4C090000]              	dd	exc11
  2342 00010860 [50090000]              	dd	exc12
  2343 00010864 [54090000]              	dd	exc13	; 0Dh, General Protection Fault
  2344 00010868 [58090000]              	dd 	exc14	; 0Eh, Page Fault
  2345 0001086C [5C090000]              	dd	exc15
  2346 00010870 [60090000]              	dd	exc16
  2347 00010874 [64090000]              	dd	exc17
  2348 00010878 [68090000]              	dd 	exc18
  2349 0001087C [6C090000]              	dd	exc19
  2350 00010880 [70090000]              	dd 	exc20
  2351 00010884 [74090000]              	dd	exc21
  2352 00010888 [78090000]              	dd	exc22
  2353 0001088C [7C090000]              	dd	exc23
  2354 00010890 [80090000]              	dd 	exc24
  2355 00010894 [84090000]              	dd	exc25
  2356 00010898 [88090000]              	dd	exc26
  2357 0001089C [8C090000]              	dd	exc27
  2358 000108A0 [90090000]              	dd 	exc28
  2359 000108A4 [94090000]              	dd	exc29
  2360 000108A8 [98090000]              	dd 	exc30
  2361 000108AC [9C090000]              	dd	exc31
  2362                                  IRQ_list: ; 28/02/2017 ('syscalbac')
  2363                                  	; Interrupt list
  2364 000108B0 [8B060000]              	dd	timer_int	; INT 20h
  2365                                  		;dd	irq0	
  2366 000108B4 [FF0D0000]              	dd	kb_int		; 24/01/2016
  2367                                  		;dd	irq1
  2368 000108B8 [6D080000]              	dd	irq2
  2369                                  		; COM2 int
  2370 000108BC [71080000]              	dd	irq3
  2371                                  		; COM1 int
  2372 000108C0 [7C080000]              	dd	irq4
  2373 000108C4 [87080000]              	dd	irq5
  2374                                  ;DISKETTE_INT: ;06/02/2015
  2375 000108C8 [B0410000]              	dd	fdc_int		; 16/02/2015, IRQ 6 handler	
  2376                                  		;dd	irq6
  2377                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  2378                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  2379 000108CC [F60B0000]              	dd	default_irq7	; 25/02/2015
  2380                                  		;dd	irq7
  2381                                  ; Real Time Clock Interrupt
  2382 000108D0 [F6070000]              	dd	rtc_int		; 23/02/2015, IRQ 8 handler
  2383                                  		;dd	irq8	; INT 28h
  2384 000108D4 [97080000]              	dd	irq9
  2385 000108D8 [9B080000]              	dd	irq10
  2386 000108DC [9F080000]              	dd	irq11
  2387 000108E0 [A3080000]              	dd	irq12
  2388 000108E4 [A7080000]              	dd	irq13
  2389                                  ;HDISK_INT1:  ;06/02/2015 	
  2390 000108E8 [2C4B0000]              	dd	hdc1_int 	; 21/02/2015, IRQ 14 handler		
  2391                                  		;dd	irq14
  2392                                  ;HDISK_INT2:  ;06/02/2015
  2393 000108EC [534B0000]              	dd	hdc2_int 	; 21/02/2015, IRQ 15 handler		
  2394                                  		;dd	irq15	; INT 2Fh
  2395                                  		; 14/08/2015
  2396                                  	;dd	sysent		; INT 30h (system calls)
  2397                                  
  2398                                  	; 15/04/2016
  2399                                  	; TRDOS 386(TRDOS v2.0) Software Interrupts
  2400                                  
  2401 000108F0 [4D090100]              	dd	int30h		; Reserved for
  2402                                  				; !!! Retro UNIX (RUNIX) !!!
  2403                                  				; !!! SINGLIX !!! System Calls
  2404 000108F4 [F2140000]              	dd	int31h		; Video BIOS (IBM PC/AT, Int 10h)
  2405 000108F8 [1E0C0000]              	dd	int32h		; Keyboard Functions (IBM PC/AT, Int 16h)
  2406 000108FC [66420000]              	dd	int33h		; DISK I/O (IBM PC/AT, Int 13h)
  2407 00010900 [84F20000]              	dd	int34h		; #IOCTL# (I/O port access support for ring 3)
  2408 00010904 [DB580000]              	dd	int35h		; Time/Date Functions (IBM PC/AT, Int 1Ah)
  2409 00010908 [AA0A0000]              	dd	ignore_int	; INT 36h : Timer Functions	
  2410 0001090C [AA0A0000]              	dd	ignore_int	; INT 37h	
  2411 00010910 [AA0A0000]              	dd	ignore_int	; INT 38h
  2412 00010914 [AA0A0000]              	dd	ignore_int	; INT 39h
  2413 00010918 [AA0A0000]              	dd	ignore_int	; INT 3Ah	
  2414 0001091C [AA0A0000]              	dd	ignore_int	; INT 3Bh
  2415 00010920 [AA0A0000]              	dd	ignore_int	; INT 3Ch
  2416 00010924 [AA0A0000]              	dd	ignore_int	; INT 3Dh	
  2417 00010928 [AA0A0000]              	dd	ignore_int	; INT 3Eh
  2418 0001092C [AA0A0000]              	dd	ignore_int	; INT 3Fh
  2419 00010930 [C1C20000]              	dd	sysent		; INT 40h : !!! TRDOS 386 System Calls !!!
  2420                                  	;dd	ignore_int
  2421 00010934 00000000                	dd	0
  2422                                  
  2423                                  ; 20/08/2014
  2424                                    ; /* This is the default interrupt "handler" :-) */ 
  2425                                    ; Linux v0.12 (head.s)
  2426                                  int_msg:
  2427 00010938 556E6B6E6F776E2069-     	db "Unknown interrupt ! ", 0
  2427 00010941 6E7465727275707420-
  2427 0001094A 212000             
  2428                                  
  2429                                  ; 15/04/2016
  2430                                  ; TRDOS 386 (TRDOS v2.0)
  2431                                  
  2432                                  ; 29/04/2016
  2433                                  int30h:
  2434                                  trdos_isc_routine:
  2435                                  	; 02/05/2016
  2436                                  	; 01/05/2016
  2437                                  	; 29/04/2016
  2438                                  	; 18/04/2016
  2439                                  	; 15/04/2016 (TRDOS 386 = TRDOS v2.0)
  2440                                  	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
  2441                                  	; 03/02/2011 ('trdos_ifc_routine')
  2442                                  	;
  2443 0001094D 8B1C24                  	mov	ebx, [esp] ; EIP (next)
  2444 00010950 83EB02                  	sub	ebx, 2 ; EIP (CD ##h)
  2445                                  
  2446 00010953 89C1                    	mov	ecx, eax
  2447 00010955 8A4301                  	mov	al, [ebx+1] ; CDh ##h
  2448                                  
  2449 00010958 66BA1000                	mov	dx, KDATA
  2450 0001095C 8EDA                    	mov	ds, dx
  2451 0001095E 8EC2                    	mov	es, dx
  2452                                  
  2453 00010960 FC                      	cld
  2454 00010961 8B15[E0410100]          	mov	edx, [k_page_dir]
  2455 00010967 0F22DA                  	mov	cr3, edx
  2456                                  
  2457 0001096A E85A29FFFF              	call	bytetohex
  2458 0001096F 66A3[D5050100]          	mov	[int_num_str], ax
  2459                                  
  2460 00010975 89D8                    	mov	eax, ebx ; EIP
  2461 00010977 E88D29FFFF              	call	dwordtohex
  2462 0001097C 8915[F1050100]          	mov	[eip_str], edx
  2463 00010982 A3[F5050100]            	mov	[eip_str+4], eax
  2464                                  
  2465 00010987 89C8                    	mov	eax, ecx
  2466 00010989 E87B29FFFF              	call	dwordtohex
  2467 0001098E 8915[E0050100]          	mov	[eax_str], edx
  2468 00010994 A3[E4050100]            	mov	[eax_str+4], eax 	
  2469                                  
  2470 00010999 43                      	inc	ebx
  2471 0001099A 8A03                    	mov	al, [ebx] ; Interrupt number
  2472                                  
  2473                                  trdos_isc_handler:
  2474 0001099C 80FE30                  	cmp	dh, 30h ; Retro UNIX, SINGLIX System calls
  2475 0001099F 7507                    	jne	short trdos_usi_handler
  2476 000109A1 BE[72050100]            	mov	esi, isc_msg
  2477 000109A6 EB05                    	jmp	short loc_write_inv_system_call_msg
  2478                                  
  2479                                  trdos_usi_handler:
  2480 000109A8 BE[88050100]            	mov	esi, usi_msg
  2481                                  
  2482                                  loc_write_inv_system_call_msg:
  2483 000109AD E80B59FFFF              	call	print_msg
  2484                                  	; 29/04/2016
  2485 000109B2 BE[BE050100]            	mov	esi, inv_msg_for_trdos_v2
  2486 000109B7 E80159FFFF              	call	print_msg
  2487                                  
  2488                                  loc_ifc_terminate_process:
  2489                                  	; u.uno = process number
  2490                                  	; 29/04/2016
  2491                                  
  2492                                  	; 02/05/2016
  2493 000109BC FE05[F75C0100]          	inc	byte [sysflg] ; 0FFh -> 0
  2494                                  
  2495 000109C2 B801000000              	mov	eax, 1
  2496 000109C7 E9CABBFFFF              	jmp	sysexit
  2497                                  
  2498                                  ; 07/03/2015
  2499                                  ; Temporary Code
  2500                                  display_disks:
  2501 000109CC 803D[565C0000]00        	cmp 	byte [fd0_type], 0
  2502 000109D3 7605                    	jna 	short ddsks1
  2503 000109D5 E87D000000              	call	pdskm
  2504                                  ddsks1:
  2505 000109DA 803D[575C0000]00        	cmp	byte [fd1_type], 0
  2506 000109E1 760C                    	jna	short ddsks2
  2507 000109E3 C605[270B0100]31        	mov	byte [dskx], '1'
  2508 000109EA E868000000              	call	pdskm
  2509                                  ddsks2:
  2510 000109EF 803D[585C0000]00        	cmp	byte [hd0_type], 0
  2511 000109F6 7654                    	jna	short ddsk6
  2512 000109F8 66C705[250B0100]68-     	mov	word [dsktype], 'hd'
  2512 00010A00 64                 
  2513 00010A01 C605[270B0100]30        	mov	byte [dskx], '0'
  2514 00010A08 E84A000000              	call	pdskm
  2515                                  ddsks3:
  2516 00010A0D 803D[595C0000]00        	cmp	byte [hd1_type], 0
  2517 00010A14 7636                    	jna	short ddsk6
  2518 00010A16 C605[270B0100]31        	mov	byte [dskx], '1'
  2519 00010A1D E835000000              	call	pdskm
  2520                                  ddsks4:
  2521 00010A22 803D[5A5C0000]00        	cmp	byte [hd2_type], 0
  2522 00010A29 7621                    	jna	short ddsk6
  2523 00010A2B C605[270B0100]32        	mov	byte [dskx], '2'
  2524 00010A32 E820000000              	call	pdskm
  2525                                  ddsks5:
  2526 00010A37 803D[5B5C0000]00        	cmp	byte [hd3_type], 0
  2527 00010A3E 760C                    	jna	short ddsk6
  2528 00010A40 C605[270B0100]33        	mov	byte [dskx], '3'
  2529 00010A47 E80B000000              	call	pdskm
  2530                                  ddsk6:
  2531 00010A4C BE[4F0B0100]            	mov	esi, nextline
  2532 00010A51 E806000000              	call	pdskml
  2533                                  pdskm_ok:
  2534 00010A56 C3                      	retn
  2535                                  pdskm:
  2536 00010A57 BE[230B0100]            	mov	esi, dsk_ready_msg
  2537                                  pdskml:	
  2538 00010A5C AC                      	lodsb
  2539 00010A5D 08C0                    	or	al, al
  2540 00010A5F 74F5                    	jz	short pdskm_ok
  2541 00010A61 56                      	push	esi
  2542                                  	; 13/05/2016
  2543 00010A62 BB07000000                      mov     ebx, 7  ; Black background, 
  2544                                  			; light gray forecolor
  2545                                  			; Video page 0 (bh=0)
  2546 00010A67 E84612FFFF              	call	_write_tty
  2547 00010A6C 5E                      	pop	esi
  2548 00010A6D EBED                    	jmp	short pdskml
  2549                                  
  2550 00010A6F 90                      Align 2
  2551                                  	; 21/08/2014
  2552                                  exc_msg:
  2553 00010A70 435055206578636570-     	db "CPU exception ! "
  2553 00010A79 74696F6E202120     
  2554                                  excnstr: 		; 25/08/2014
  2555 00010A80 3F3F68202045495020-     	db "??h", "  EIP : "
  2555 00010A89 3A20               
  2556                                  EIPstr: ; 29/08/2014
  2557 00010A8B 00<rept>                	times 12 db 0
  2558                                  
  2559                                  	; 23/02/2015
  2560                                  	; 25/08/2014
  2561                                  ;scounter:
  2562                                  ;	db 5
  2563                                  ;	db 19
  2564                                  
  2565                                  ; 06/11/2014
  2566                                  ; Memory Information message
  2567                                  ; 14/08/2015
  2568                                  msg_memory_info:
  2569 00010A97 07                      	db	07h
  2570 00010A98 0D0A                    	db	0Dh, 0Ah
  2571                                  	;db 	"MEMORY ALLOCATION INFO", 0Dh, 0Ah, 0Dh, 0Ah
  2572 00010A9A 546F74616C206D656D-     	db	"Total memory : "
  2572 00010AA3 6F7279203A20       
  2573                                  mem_total_b_str: ; 10 digits
  2574 00010AA9 303030303030303030-     	db	"0000000000 bytes", 0Dh, 0Ah
  2574 00010AB2 302062797465730D0A 
  2575 00010ABB 202020202020202020-     	db	"               ", 20h, 20h, 20h
  2575 00010AC4 202020202020202020 
  2576                                  mem_total_p_str: ; 7 digits
  2577 00010ACD 303030303030302070-     	db	"0000000 pages", 0Dh, 0Ah
  2577 00010AD6 616765730D0A       
  2578 00010ADC 0D0A                    	db 	0Dh, 0Ah
  2579 00010ADE 46726565206D656D6F-     	db	"Free memory  : "
  2579 00010AE7 727920203A20       
  2580                                  free_mem_b_str:  ; 10 digits
  2581 00010AED 3F3F3F3F3F3F3F3F3F-     	db	"?????????? bytes", 0Dh, 0Ah
  2581 00010AF6 3F2062797465730D0A 
  2582 00010AFF 202020202020202020-     	db	"               ", 20h, 20h, 20h
  2582 00010B08 202020202020202020 
  2583                                  free_mem_p_str:  ; 7 digits
  2584 00010B11 3F3F3F3F3F3F3F2070-     	db	"??????? pages", 0Dh, 0Ah
  2584 00010B1A 616765730D0A       
  2585 00010B20 0D0A00                  	db	0Dh, 0Ah, 0
  2586                                  
  2587                                  dsk_ready_msg:
  2588 00010B23 0D0A                    	db 	0Dh, 0Ah
  2589                                  dsktype:
  2590 00010B25 6664                    	db	'fd'
  2591                                  dskx:
  2592 00010B27 30                      	db	'0'
  2593 00010B28 20                      	db	20h
  2594 00010B29 697320524541445920-     	db 	'is READY ...'
  2594 00010B32 2E2E2E             
  2595 00010B35 00                      	db 	0
  2596                                  
  2597                                  setup_error_msg:
  2598 00010B36 0D0A                    	db 0Dh, 0Ah
  2599 00010B38 4469736B2053657475-     	db 'Disk Setup Error !' 
  2599 00010B41 70204572726F722021 
  2600 00010B4A 0D0A00                  	db 0Dh, 0Ah,0
  2601                                  
  2602                                  next2line: ; 08/02/2016
  2603 00010B4D 0D0A                    	db	0Dh, 0Ah
  2604                                  nextline:
  2605 00010B4F 0D0A00                  	db 	0Dh, 0Ah, 0
  2606                                  
  2607                                  ; KERNEL - SYSINIT Messages
  2608                                  ; 24/08/2015
  2609                                  ; 13/04/2015 - (Retro UNIX 386 v1 Beginning)
  2610                                  ; 14/07/2013
  2611                                  ;kernel_init_err_msg:
  2612                                  ;	db 0Dh, 0Ah
  2613                                  ;	db 07h
  2614                                  ;	db 'Kernel initialization ERROR !'
  2615                                  ;	db 0Dh, 0Ah, 0 
  2616                                  
  2617                                  ;welcome_msg: 
  2618                                  ;	db 0Dh, 0Ah
  2619                                  ;	db 07h
  2620                                  ;	db 'Welcome to TRDOS 386 Operating System !'
  2621                                  ;	db 0Dh, 0Ah
  2622                                  ;	db 'by Erdogan Tan - 23/04/2017 (v2.0.0)'
  2623                                  ;	db 0Dh, 0Ah, 0
  2624                                  
  2625                                  panic_msg:
  2626 00010B52 0D0A07                  	db 0Dh, 0Ah, 07h
  2627 00010B55 4552524F523A204B65-     	db 'ERROR: Kernel Panic !'
  2627 00010B5E 726E656C2050616E69-
  2627 00010B67 632021             
  2628 00010B6A 0D0A00                  	db 0Dh, 0Ah, 0
  2629                                  
  2630                                  ;msgl_drv_not_ready: 
  2631                                  ;	db 07h, 0Dh, 0Ah
  2632                                  ;       db 'Drive not ready or read error !'
  2633                                  ;       db 0Dh, 0Ah, 0
  2634                                  
  2635                                  starting_msg:
  2636 00010B6D 5475726B6973682052-     	db "Turkish Rational DOS v2.0 [23/04/2017] ...", 0
  2636 00010B76 6174696F6E616C2044-
  2636 00010B7F 4F532076322E30205B-
  2636 00010B88 32332F30342F323031-
  2636 00010B91 375D202E2E2E00     
  2637                                  NextLine:
  2638 00010B98 0D0A00                  	db 0Dh, 0Ah, 0
  2639                                  
  2640                                  %include 'audio.s' ; 03/04/2017
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - audio.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 23/04/2017
     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
   103                              <1> VIA_ACLINK_CTRL_INIT	equ  (VIA_ACLINK_CTRL_ENABLE +                               VIA_ACLINK_CTRL_RESET +                               VIA_ACLINK_CTRL_PCM +                               VIA_ACLINK_CTRL_VRA)
   104                              <1> 
   105                              <1> CODEC_AUX_VOL		equ   04h
   106                              <1> VIA_REG_AC97_BUSY	equ   01000000h ;(1<<24) 
   107                              <1> VIA_REG_AC97_CMD_SHIFT	equ   10h ; 16
   108                              <1> VIA_REG_AC97_PRIMARY_VALID equ 02000000h ;(1<<25)
   109                              <1> VIA_REG_AC97_READ	equ   00800000h ;(1<<23)
   110                              <1> VIA_REG_AC97_CODEC_ID_SHIFT   equ  1Eh ; 30
   111                              <1> VIA_REG_AC97_CODEC_ID_PRIMARY equ  0
   112                              <1> VIA_REG_AC97_DATA_SHIFT equ   0
   113                              <1> VIADEV_PLAYBACK         equ   0
   114                              <1> VIA_REG_OFFSET_STATUS   equ   0    ;; byte - channel status
   115                              <1> VIA_REG_OFFSET_CONTROL  equ   01h  ;; byte - channel control
   116                              <1> VIA_REG_CTRL_START	equ   80h  ;; WO
   117                              <1> VIA_REG_CTRL_TERMINATE  equ   40h  ;; WO
   118                              <1> VIA_REG_CTRL_PAUSE      equ   08h  ;; RW
   119                              <1> VIA_REG_CTRL_RESET      equ   01h  ;; RW - probably reset? undocumented
   120                              <1> VIA_REG_OFFSET_STOP_IDX equ   08h  ;; dword - stop index, channel type, sample rate
   121                              <1> VIA8233_REG_TYPE_16BIT  equ   200000h ;; RW
   122                              <1> VIA8233_REG_TYPE_STEREO equ   100000h ;; RW
   123                              <1> VIA_REG_OFFSET_CURR_INDEX equ 0Fh ;; byte - channel current index (for via8233 only)
   124                              <1> VIA_REG_OFFSET_TABLE_PTR equ  04h  ;; dword - channel table pointer
   125                              <1> VIA_REG_OFFSET_CURR_PTR equ   04h  ;; dword - channel current pointer
   126                              <1> VIA_REG_OFS_PLAYBACK_VOLUME_L equ  02h ;; byte
   127                              <1> VIA_REG_OFS_PLAYBACK_VOLUME_R equ  03h ;; byte
   128                              <1> VIA_REG_CTRL_AUTOSTART	equ   20h
   129                              <1> VIA_REG_CTRL_INT_EOL	equ   02h
   130                              <1> VIA_REG_CTRL_INT_FLAG	equ   01h
   133                              <1> VIA_REG_CTRL_INT	equ  (VIA_REG_CTRL_INT_FLAG +                               VIA_REG_CTRL_INT_EOL +                               VIA_REG_CTRL_AUTOSTART)
   134                              <1> 
   135                              <1> VIA_REG_STAT_STOPPED	equ   04h    ;; RWC
   136                              <1> VIA_REG_STAT_EOL	equ   02h    ;; RWC
   137                              <1> VIA_REG_STAT_FLAG	equ   01h    ;; RWC
   138                              <1> VIA_REG_STAT_ACTIVE	equ   80h    ;; RO
   139                              <1> ; 28/11/2016
   140                              <1> VIA_REG_STAT_LAST	equ   40h    ;; RO
   141                              <1> VIA_REG_STAT_TRIGGER_QUEUED equ 08h  ;; RO
   142                              <1> VIA_REF_CTRL_INT_STOP	equ   04h  ; Interrupt on Current Index = Stop Index
   143                              <1> 		   		   ; and End of Block
   144                              <1> 
   145                              <1> VIA_REG_OFFSET_CURR_COUNT equ 0Ch ;; dword - channel current count, index
   146                              <1> 
   147                              <1> PORTB		EQU	061h
   148                              <1> REFRESH_STATUS	EQU	010h	; Refresh signal status
   149                              <1> 
   150                              <1> ; AC97 Codec registers.
   151                              <1> 
   152                              <1> ; each codec/mixer register is 16bits
   153                              <1> 
   154                              <1> CODEC_RESET_REG                 equ     00      ; reset codec
   155                              <1> CODEC_MASTER_VOL_REG            equ     02      ; master volume
   156                              <1> CODEC_HP_VOL_REG                equ     04      ; headphone volume
   157                              <1> CODEC_MASTER_MONO_VOL_REG       equ     06      ; master mono volume
   158                              <1> CODEC_MASTER_TONE_REG           equ     08      ; master tone (R+L)
   159                              <1> CODEC_PCBEEP_VOL_REG            equ     0ah     ; PC beep volume
   160                              <1> CODEC_PHONE_VOL_REG             equ     0bh     ; phone volume
   161                              <1> CODEC_MIC_VOL_REG               equ     0eh     ; MIC volume
   162                              <1> CODEC_LINE_IN_VOL_REG           equ     10h     ; line input volume
   163                              <1> CODEC_CD_VOL_REG                equ     12h     ; CD volume
   164                              <1> CODEC_VID_VOL_REG               equ     14h     ; video volume
   165                              <1> CODEC_AUX_VOL_REG               equ     16h     ; aux volume
   166                              <1> CODEC_PCM_OUT_REG               equ     18h     ; PCM output volume
   167                              <1> CODEC_RECORD_SELECT_REG         equ     1ah     ; record select input
   168                              <1> CODEC_RECORD_VOL_REG            equ     1ch     ; record volume
   169                              <1> CODEC_RECORD_MIC_VOL_REG        equ     1eh     ; record mic volume
   170                              <1> CODEC_GP_REG                    equ     20h     ; general purpose
   171                              <1> CODEC_3D_CONTROL_REG            equ     22h     ; 3D control
   172                              <1> ; 24h is reserved
   173                              <1> CODEC_POWER_CTRL_REG            equ     26h     ; powerdown control
   174                              <1> CODEC_EXT_AUDIO_REG             equ     28h     ; extended audio
   175                              <1> CODEC_EXT_AUDIO_CTRL_REG        equ     2ah     ; extended audio control
   176                              <1> CODEC_PCM_FRONT_DACRATE_REG     equ     2ch     ; PCM out sample rate
   177                              <1> CODEC_PCM_SURND_DACRATE_REG     equ     2eh     ; surround sound sample rate
   178                              <1> CODEC_PCM_LFE_DACRATE_REG       equ     30h     ; LFE sample rate
   179                              <1> CODEC_LR_ADCRATE_REG            equ     32h     ; PCM in sample rate
   180                              <1> CODEC_MIC_ADCRATE_REG           equ     34h     ; mic in sample rate
   181                              <1> 
   182                              <1> ; VT8233 SGD bits (21/04/2017)
   183                              <1> FLAG	EQU BIT30
   184                              <1> EOL	EQU BIT31
   185                              <1> 
   186                              <1> ;=============================================================================
   187                              <1> ;               CODE
   188                              <1> ;=============================================================================
   189                              <1> 
   190                              <1> ; CODE for VIA VT8233 AUDIO CONTROLLER
   191                              <1> 
   192                              <1> DetectVT8233:
   193                              <1> 	; 03/04/2017
   194 00010B9B B806115930          <1> 	mov     eax, (VT8233_DID << 16) + VIA_VID
   195 00010BA0 E868000000          <1>         call    pciFindDevice
   196 00010BA5 7301                <1>         jnc     short d_vt8233_0
   197                              <1> ; couldn't find the audio device!
   198 00010BA7 C3                  <1> 	retn
   199                              <1> d_vt8233_0:
   200                              <1> 	; 24/03/2017 ('player.asm')
   201                              <1> 	; 12/11/2016 
   202                              <1> 	; Erdogan Tan - 8/11/2016
   203                              <1> 	; References: Kolibrios - vt823x.asm (2016)
   204                              <1> 	;	      VIA VT8235 V-Link South Bridge (VT8235-VIA.PDF)(2002)
   205                              <1> 	;	      lowlevel.eu - AC97 (2016)
   206                              <1> 	;	      .wav player for DOS by Jeff Leyda (2002) -this file-
   207                              <1> 	;	      Linux kernel - via82xx.c (2016)
   208                              <1> 
   209                              <1> 	; eax = BUS/DEV/FN
   210                              <1> 	;	00000000BBBBBBBBDDDDDFFF00000000
   211                              <1> 	; edx = DEV/VENDOR
   212                              <1> 	;	DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV
   213                              <1> 
   214 00010BA8 A3[6C550100]        <1> 	mov	[audio_dev_id], eax
   215 00010BAD 8915[70550100]      <1> 	mov	[audio_vendor], edx
   216                              <1> 
   217                              <1> 	; init controller
   218 00010BB3 B004                <1> 	mov	al, PCI_CMD_REG ; command register (04h)
   219 00010BB5 E8E0000000          <1> 	call	pciRegRead32
   220                              <1> 
   221                              <1> 	; eax = BUS/DEV/FN/REG
   222                              <1> 	; edx = STATUS/COMMAND
   223                              <1> 	; 	SSSSSSSSSSSSSSSSCCCCCCCCCCCCCCCC
   224 00010BBA 8915[74550100]      <1> 	mov	[audio_stats_cmd], edx
   225                              <1> 
   226 00010BC0 B010                <1> 	mov	al, PCI_IO_BASE ; IO base address register (10h)
   227 00010BC2 E8D3000000          <1> 	call	pciRegRead32
   228                              <1> 
   229 00010BC7 6683E2C0            <1> 	and     dx, 0FFC0h	; IO_ADDR_MASK (0FFFE) ?
   230 00010BCB 668915[6A550100]    <1>         mov     [audio_io_base], dx
   231                              <1> 
   232 00010BD2 B03C                <1> 	mov	al, AC97_INT_LINE ; Interrupt line register (3Ch)
   233 00010BD4 E8C1000000          <1> 	call	pciRegRead32
   234                              <1> 
   235 00010BD9 81E2FF000000        <1> 	and 	edx, 0FFh
   236 00010BDF 8815[67550100]      <1>   	mov     [audio_intr], dl
   237                              <1> 
   238                              <1> 	; (Note: Interrupts are already enabled by TRDOS 386 kernel!)
   239 00010BE5 6689D1              <1> 	mov	cx, dx
   240                              <1> 	
   241 00010BE8 E4A1                <1> 	in	al, 0A1h ; irq 8-15
   242 00010BEA 88C4                <1> 	mov	ah, al
   243 00010BEC E421                <1> 	in	al, 21h  ; irq 0-7 
   244 00010BEE 660FB3D0            <1> 	btr	ax, dx	 ; unmask ; 17/03/2017
   245 00010BF2 E621                <1> 	out	21h, al  ; enable interrupt (if irq <= 7)
   246 00010BF4 88E0                <1> 	mov	al, ah
   247 00010BF6 E6A1                <1> 	out	0A1h, al ; enable interrupt (if irq > 7)
   248                              <1> 
   249 00010BF8 66BAD104            <1> 	mov	dx, 4D1h	; 8259 ELCR1
   250 00010BFC EC                  <1>     	in	al, dx
   251 00010BFD 88C4                <1> 	mov	ah, al
   252                              <1> 	;mov	dx, 4D0h 
   253 00010BFF FECA                <1> 	dec	dl
   254 00010C01 EC                  <1> 	in	al, dx
   255 00010C02 660FABC8            <1> 	bts	ax, cx
   256                              <1> 	;mov	dx, 4D0h
   257 00010C06 EE                  <1> 	out	dx, al		; set level-triggered mode
   258                              <1> 	;mov	dx, 4D1h
   259 00010C07 FEC2                <1> 	inc	dl
   260 00010C09 EE                  <1> 	out	dx, al		; set level-triggered mode
   261                              <1> 
   262 00010C0A 31C0                <1> 	xor	eax, eax ; 0
   263                              <1> 
   264 00010C0C C3                  <1> 	retn
   265                              <1> 
   266                              <1> ; CODE for PCI
   267                              <1> 
   268                              <1> pciFindDevice:
   269                              <1> 	; 03/04/2017 ('pci.asm', 20/03/2017)
   270                              <1> 	;
   271                              <1> 	; scan through PCI space looking for a device+vendor ID
   272                              <1> 	;
   273                              <1> 	; Entry: EAX=Device+Vendor ID
   274                              <1> 	;
   275                              <1> 	; Exit: EAX=PCI address if device found
   276                              <1> 	;	 EDX=Device+Vendor ID
   277                              <1> 	;        CY clear if found, set if not found. EAX invalid if CY set.
   278                              <1> 	;
   279                              <1> 	; Destroys: ebx, esi, edi, cl
   280                              <1> 	;
   281                              <1> 
   282                              <1> 	;push	ecx
   283 00010C0D 50                  <1> 	push	eax
   284                              <1> 	;push	esi
   285                              <1> 	;push	edi
   286                              <1> 
   287 00010C0E 89C6                <1>         mov     esi, eax                ; save off vend+device ID
   288 00010C10 BF00FFFF7F          <1>         mov     edi, (80000000h - 100h) ; start with bus 0, dev 0 func 0
   289                              <1> 
   290                              <1> nextPCIdevice:
   291 00010C15 81C700010000        <1>         add     edi, 100h
   292 00010C1B 81FF00F8FF80        <1>         cmp     edi, 80FFF800h		; scanned all devices?
   293 00010C21 F9                  <1>         stc
   294 00010C22 740C                <1>         je      short PCIScanExit       ; not found
   295                              <1> 
   296 00010C24 89F8                <1>         mov     eax, edi                ; read PCI registers
   297 00010C26 E86F000000          <1>         call    pciRegRead32
   298 00010C2B 39F2                <1>         cmp     edx, esi                ; found device?
   299 00010C2D 75E6                <1>         jne     short nextPCIdevice
   300 00010C2F F8                  <1>         clc
   301                              <1> 
   302                              <1> PCIScanExit:
   303 00010C30 9C                  <1> 	pushf
   304 00010C31 B8FFFFFF7F          <1> 	mov	eax, NOT_BIT31 	; 19/03/2017
   305 00010C36 21F8                <1> 	and	eax, edi	; return only bus/dev/fn #
   306 00010C38 9D                  <1> 	popf
   307                              <1> 
   308                              <1> 	;pop	edi
   309                              <1> 	;pop	esi
   310 00010C39 5A                  <1> 	pop	edx
   311                              <1> 	;pop	ecx
   312 00010C3A C3                  <1> 	retn
   313                              <1> 
   314                              <1> pciRegRead:
   315                              <1> 	; 03/04/2017 ('pci.asm', 20/03/2017)
   316                              <1> 	;
   317                              <1> 	; 8/16/32bit PCI reader
   318                              <1> 	;
   319                              <1> 	; Entry: EAX=PCI Bus/Device/fn/register number
   320                              <1> 	;           BIT30 set if 32 bit access requested
   321                              <1> 	;           BIT29 set if 16 bit access requested
   322                              <1> 	;           otherwise defaults to 8 bit read
   323                              <1> 	;
   324                              <1> 	; Exit:  DL,DX,EDX register data depending on requested read size
   325                              <1> 	;
   326                              <1> 	; Note1: this routine is meant to be called via pciRegRead8,
   327                              <1> 	;	 pciRegread16 or pciRegRead32, listed below.
   328                              <1> 	;
   329                              <1> 	; Note2: don't attempt to read 32 bits of data from a non dword
   330                              <1> 	;	 aligned reg number.  Likewise, don't do 16 bit reads from
   331                              <1> 	;	 non word aligned reg #
   332                              <1> 	
   333 00010C3B 53                  <1> 	push	ebx
   334 00010C3C 51                  <1> 	push	ecx
   335 00010C3D 89C3                <1>         mov     ebx, eax		; save eax, dh
   336 00010C3F 88F1                <1>         mov     cl, dh
   337                              <1> 
   338 00010C41 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   339 00010C46 0D00000080          <1>         or      eax, BIT31		; make a PCI access request
   340 00010C4B 24FC                <1>         and     al, ~3 ; NOT 3		; force index to be dword
   341                              <1> 
   342 00010C4D 66BAF80C            <1>         mov     dx, PCI_INDEX_PORT
   343 00010C51 EF                  <1>         out	dx, eax			; write PCI selector
   344                              <1> 	
   345 00010C52 66BAFC0C            <1>         mov     dx, PCI_DATA_PORT
   346 00010C56 88D8                <1>         mov     al, bl
   347 00010C58 2403                <1>         and     al, 3			; figure out which port to
   348 00010C5A 00C2                <1>         add     dl, al			; read to
   349                              <1> 
   350 00010C5C F7C3000000C0        <1> 	test    ebx, PCI32+PCI16
   351 00010C62 7507                <1>         jnz     short _pregr0
   352 00010C64 EC                  <1> 	in	al, dx			; return 8 bits of data
   353 00010C65 88C2                <1>         mov	dl, al
   354 00010C67 88CE                <1> 	mov     dh, cl			; restore dh for 8 bit read
   355 00010C69 EB12                <1> 	jmp	short _pregr2
   356                              <1> _pregr0:	
   357 00010C6B F7C300000080        <1> 	test    ebx, PCI32
   358 00010C71 7507                <1>         jnz	short _pregr1
   359 00010C73 66ED                <1> 	in	ax, dx
   360 00010C75 6689C2              <1>         mov     dx, ax			; return 16 bits of data
   361 00010C78 EB03                <1> 	jmp	short _pregr2
   362                              <1> _pregr1:
   363 00010C7A ED                  <1> 	in	eax, dx			; return 32 bits of data
   364 00010C7B 89C2                <1> 	mov	edx, eax
   365                              <1> _pregr2:
   366 00010C7D 89D8                <1> 	mov     eax, ebx		; restore eax
   367 00010C7F 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   368 00010C84 59                  <1> 	pop	ecx
   369 00010C85 5B                  <1> 	pop	ebx
   370 00010C86 C3                  <1> 	retn
   371                              <1> 
   372                              <1> pciRegRead8:
   373 00010C87 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 8 bit read size
   374 00010C8C EBAD                <1>         jmp     short pciRegRead	; call generic PCI access
   375                              <1> 
   376                              <1> pciRegRead16:
   377 00010C8E 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 16 bit read size
   378 00010C93 0D00000040          <1>         or      eax, PCI16		; call generic PCI access
   379 00010C98 EBA1                <1>         jmp     short pciRegRead
   380                              <1> 
   381                              <1> pciRegRead32:
   382 00010C9A 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 32 bit read size
   383 00010C9F 0D00000080          <1>         or      eax, PCI32		; call generic PCI access
   384 00010CA4 EB95                <1>         jmp     pciRegRead
   385                              <1> 
   386                              <1> pciRegWrite:
   387                              <1> 	; 03/04/2017 ('pci.asm', 29/11/2016)
   388                              <1> 	;
   389                              <1> 	; 8/16/32bit PCI writer
   390                              <1> 	;
   391                              <1> 	; Entry: EAX=PCI Bus/Device/fn/register number
   392                              <1> 	;           BIT31 set if 32 bit access requested
   393                              <1> 	;           BIT30 set if 16 bit access requested
   394                              <1> 	;           otherwise defaults to 8bit read
   395                              <1> 	;        DL/DX/EDX data to write depending on size
   396                              <1> 	;
   397                              <1> 	; Note1: this routine is meant to be called via pciRegWrite8, 
   398                              <1> 	;	 pciRegWrite16 or pciRegWrite32 as detailed below.
   399                              <1> 	;
   400                              <1> 	; Note2: don't attempt to write 32bits of data from a non dword
   401                              <1> 	;	 aligned reg number.  Likewise, don't do 16 bit writes from
   402                              <1> 	;	 non word aligned reg #
   403                              <1> 
   404 00010CA6 53                  <1> 	push	ebx
   405 00010CA7 51                  <1> 	push	ecx
   406 00010CA8 89C3                <1>         mov     ebx, eax		; save eax, edx
   407 00010CAA 89D1                <1>         mov     ecx, edx
   408 00010CAC 25FFFFFF3F          <1> 	and     eax, NOT_PCI32_PCI16	; clear out data size request
   409 00010CB1 0D00000080          <1>         or      eax, BIT31		; make a PCI access request
   410 00010CB6 24FC                <1>         and     al, ~3 ; NOT 3		; force index to be dword
   411                              <1> 
   412 00010CB8 66BAF80C            <1>         mov     dx, PCI_INDEX_PORT
   413 00010CBC EF                  <1>         out	dx, eax			; write PCI selector
   414                              <1> 	
   415 00010CBD 66BAFC0C            <1>         mov     dx, PCI_DATA_PORT
   416 00010CC1 88D8                <1>         mov     al, bl
   417 00010CC3 2403                <1>         and     al, 3			; figure out which port to
   418 00010CC5 00C2                <1>         add     dl, al			; write to
   419                              <1> 
   420 00010CC7 F7C3000000C0        <1> 	test    ebx, PCI32+PCI16
   421 00010CCD 7505                <1>         jnz     short _pregw0
   422 00010CCF 88C8                <1> 	mov	al, cl 			; put data into al
   423 00010CD1 EE                  <1> 	out	dx, al
   424 00010CD2 EB12                <1> 	jmp	short _pregw2
   425                              <1> _pregw0:
   426 00010CD4 F7C300000080        <1> 	test    ebx, PCI32
   427 00010CDA 7507                <1>         jnz     short _pregw1
   428 00010CDC 6689C8              <1> 	mov	ax, cx			; put data into ax
   429 00010CDF 66EF                <1> 	out	dx, ax
   430 00010CE1 EB03                <1> 	jmp	short _pregw2
   431                              <1> _pregw1:
   432 00010CE3 89C8                <1> 	mov	eax, ecx		; put data into eax 		
   433 00010CE5 EF                  <1> 	out	dx, eax
   434                              <1> _pregw2:
   435 00010CE6 89D8                <1>         mov     eax, ebx		; restore eax
   436 00010CE8 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   437 00010CED 89CA                <1>         mov     edx, ecx		; restore dx
   438 00010CEF 59                  <1> 	pop	ecx
   439 00010CF0 5B                  <1> 	pop	ebx
   440 00010CF1 C3                  <1> 	retn
   441                              <1> 
   442                              <1> pciRegWrite8:
   443 00010CF2 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 8 bit write size
   444 00010CF7 EBAD                <1>         jmp	short pciRegWrite	; call generic PCI access
   445                              <1> 
   446                              <1> pciRegWrite16:
   447 00010CF9 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 16 bit write size
   448 00010CFE 0D00000040          <1>         or      eax, PCI16		; call generic PCI access
   449 00010D03 EBA1                <1>         jmp	short pciRegWrite
   450                              <1> 
   451                              <1> pciRegWrite32:
   452 00010D05 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 32 bit write size
   453 00010D0A 0D00000080          <1>         or      eax, PCI32		; call generic PCI access
   454 00010D0F EB95                <1>         jmp	pciRegWrite
   455                              <1> 
   456                              <1> reset_codec:
   457                              <1> 	; 16/04/2017
   458                              <1> 	; 23/03/2017 
   459                              <1> 	; ('codec.asm')
   460                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   461 00010D11 A1[6C550100]        <1> 	mov	eax, [audio_dev_id]
   462 00010D16 B041                <1>  	mov	al, VIA_ACLINK_CTRL
   463 00010D18 B2E0                <1>        	mov	dl, VIA_ACLINK_CTRL_ENABLE + VIA_ACLINK_CTRL_RESET + VIA_ACLINK_CTRL_SYNC
   464 00010D1A E8D3FFFFFF          <1> 	call	pciRegWrite8
   465                              <1> 
   466 00010D1F E83D000000          <1> 	call	delay_100ms 	; wait 100 ms
   467                              <1> _rc_cold:
   468 00010D24 E808000000          <1>         call    cold_reset
   469 00010D29 7301                <1>         jnc     short _reset_codec_ok
   470                              <1> 	
   471                              <1> 	; 16/04/2017
   472                              <1>         ;xor     eax, eax         ; timeout error
   473                              <1>        	;stc
   474 00010D2B C3                  <1> 	retn
   475                              <1> 
   476                              <1> _reset_codec_ok:
   477 00010D2C 31C0                <1>         xor     eax, eax
   478                              <1>         ;mov	al, VIA_ACLINK_C00_READY ; 1
   479 00010D2E FEC0                <1>         inc	al
   480 00010D30 C3                  <1> 	retn
   481                              <1> 
   482                              <1> cold_reset:
   483                              <1> 	; 16/04/2017
   484                              <1> 	; 23/03/2017
   485                              <1> 	; ('codec.asm')
   486                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   487                              <1> 	;mov	eax, [audio_dev_id]
   488                              <1> 	;mov	al, VIA_ACLINK_CTRL
   489 00010D31 30D2                <1> 	xor	dl, dl ; 0
   490 00010D33 E8BAFFFFFF          <1> 	call	pciRegWrite8
   491                              <1> 
   492 00010D38 E824000000          <1> 	call	delay_100ms 	; wait 100 ms
   493                              <1> 
   494                              <1> 	;; ACLink on, deassert ACLink reset, VSR, SGD data out
   495                              <1>         ;; note - FM data out has trouble with non VRA codecs !!
   496                              <1>         
   497                              <1> 	;mov	eax, [audio_dev_id]
   498                              <1> 	;mov	al, VIA_ACLINK_CTRL
   499 00010D3D B2CC                <1> 	mov	dl, VIA_ACLINK_CTRL_INIT
   500 00010D3F E8AEFFFFFF          <1> 	call	pciRegWrite8
   501                              <1> 
   502 00010D44 B910000000          <1> 	mov	ecx, 16	; total 2s
   503                              <1> 
   504                              <1> _crst_wait:
   505                              <1> 	;mov	eax, [audio_dev_id]
   506 00010D49 B040                <1> 	mov	al, VIA_ACLINK_STAT
   507 00010D4B E837FFFFFF          <1> 	call	pciRegRead8	
   508                              <1> 
   509 00010D50 F6C201              <1>         test    dl, VIA_ACLINK_C00_READY
   510 00010D53 750B                <1>         jnz     short _crst_ok
   511                              <1> 
   512 00010D55 51                  <1> 	push	ecx
   513 00010D56 E806000000          <1> 	call	delay_100ms
   514 00010D5B 59                  <1> 	pop	ecx
   515                              <1> 
   516 00010D5C 49                  <1>         dec     ecx
   517 00010D5D 75EA                <1>         jnz     short _crst_wait
   518                              <1> 
   519                              <1> _crst_fail:
   520 00010D5F F9                  <1>         stc
   521                              <1> _crst_ok:
   522 00010D60 C3                  <1> 	retn
   523                              <1> 
   524                              <1> delay_100ms:
   525                              <1> 	; 24/03/2017 ('codec.asm')
   526                              <1> 	; wait 100 ms
   527 00010D61 B919000000          <1> 	mov	ecx, 25
   528                              <1> _delay_x_ms:
   529 00010D66 E803000000          <1> 	call	delay1_4ms
   530 00010D6B E2F9                <1>         loop	_delay_x_ms
   531 00010D6D C3                  <1> 	retn
   532                              <1> 
   533                              <1> ;       delay1_4ms - Delay for 1/4 millisecond.
   534                              <1> ;	    1mS = 1000us
   535                              <1> ;       Entry:
   536                              <1> ;         None
   537                              <1> ;       Exit:
   538                              <1> ;	  None
   539                              <1> ;
   540                              <1> ;       Modified:
   541                              <1> ;         None
   542                              <1> ;
   543                              <1> 
   544                              <1> 	; 23/04/2017
   545                              <1> 	; 05/03/2017 (TRDOS 386)
   546                              <1> 	; ('UTILS.ASM')
   547                              <1> delay1_4ms:
   548 00010D6E 50                  <1>         push    eax 
   549 00010D6F 51                  <1>         push    ecx
   550 00010D70 B110                <1>         mov	cl, 16		; close enough.
   551                              <1> 
   552 00010D72 E461                <1> 	in	al, PORTB
   553                              <1> 		
   554 00010D74 2410                <1> 	and	al, REFRESH_STATUS
   555 00010D76 88C5                <1> 	mov	ch, al		; Start toggle state
   556 00010D78 08C9                <1> 	or	cl, cl
   557 00010D7A 7402                <1> 	jz	short _d4ms1
   558 00010D7C FEC1                <1> 	inc	cl		; Throwaway first toggle
   559                              <1> _d4ms1:	
   560 00010D7E E461                <1> 	in	al, PORTB	; Read system control port
   561                              <1> 	
   562 00010D80 2410                <1> 	and	al, REFRESH_STATUS ; Refresh toggles 15.085 microseconds
   563 00010D82 38C5                <1> 	cmp	ch, al
   564 00010D84 74F8                <1> 	je	short _d4ms1	; Wait for state change
   565                              <1> 
   566 00010D86 88C5                <1> 	mov	ch, al		; Update with new state
   567 00010D88 FEC9                <1> 	dec	cl
   568 00010D8A 75F2                <1> 	jnz	short _d4ms1
   569                              <1> 
   570 00010D8C 59                  <1>         pop     ecx
   571 00010D8D 58                  <1>         pop     eax
   572 00010D8E C3                  <1>         retn
   573                              <1> 
   574                              <1> ; 10/04/2017 (TRDOS 386)
   575                              <1> ; 12/11/2016
   576                              <1> 
   577                              <1> codec_io_w16: ;w32
   578                              <1> 	; ('codec.asm')
   579 00010D8F 668B15[6A550100]    <1>         mov	dx, [audio_io_base]
   580 00010D96 6681C28000          <1>         add     dx, VIA_REG_AC97
   581 00010D9B EF                  <1> 	out	dx, eax
   582 00010D9C C3                  <1>         retn
   583                              <1> 
   584                              <1> codec_io_r16: ;r32
   585                              <1> 	; ('codec.asm')
   586 00010D9D 668B15[6A550100]    <1>         mov     dx, [audio_io_base]
   587 00010DA4 6681C28000          <1>         add     dx, VIA_REG_AC97
   588 00010DA9 ED                  <1>         in	eax, dx
   589 00010DAA C3                  <1>         retn
   590                              <1> 
   591                              <1> ctrl_io_w8:
   592                              <1> 	; ('codec.asm')
   593 00010DAB 660315[6A550100]    <1>         add     dx, [audio_io_base]
   594 00010DB2 EE                  <1>         out	dx, al
   595 00010DB3 C3                  <1>         retn
   596                              <1> 
   597                              <1> ctrl_io_r8:
   598                              <1> 	; ('codec.asm')
   599 00010DB4 660315[6A550100]    <1>         add     dx, [audio_io_base]
   600 00010DBB EC                  <1>         in	al, dx
   601 00010DBC C3                  <1>         retn
   602                              <1> 
   603                              <1> ctrl_io_w32:
   604                              <1> 	; ('codec.asm')
   605 00010DBD 660315[6A550100]    <1>         add     dx, [audio_io_base]
   606 00010DC4 EF                  <1>         out	dx, eax
   607 00010DC5 C3                  <1>         retn
   608                              <1> 
   609                              <1> ctrl_io_r32:
   610                              <1> 	; ('codec.asm')
   611 00010DC6 660315[6A550100]    <1>         add	dx, [audio_io_base]
   612 00010DCD ED                  <1> 	in	eax, dx
   613 00010DCE C3                  <1>         retn
   614                              <1> 
   615                              <1> codec_read:
   616                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   617                              <1>         ; Use only primary codec.
   618                              <1>         ; eax = register
   619 00010DCF C1E010              <1>         shl     eax, VIA_REG_AC97_CMD_SHIFT
   620 00010DD2 0D00008002          <1>         or      eax, VIA_REG_AC97_PRIMARY_VALID + VIA_REG_AC97_READ
   621                              <1> 
   622 00010DD7 E8B3FFFFFF          <1> 	call    codec_io_w16
   623                              <1> 
   624                              <1>       	; codec_valid
   625 00010DDC E83E000000          <1> 	call	codec_check_ready
   626 00010DE1 7301                <1>         jnc	short _cr_ok
   627                              <1> 
   628 00010DE3 C3                  <1> 	retn
   629                              <1> 
   630                              <1> _cr_ok:
   631                              <1> 	; wait 25 ms
   632 00010DE4 E885FFFFFF          <1> 	call	delay1_4ms
   633 00010DE9 E880FFFFFF          <1> 	call	delay1_4ms
   634 00010DEE E87BFFFFFF          <1> 	call	delay1_4ms
   635 00010DF3 E876FFFFFF          <1> 	call	delay1_4ms
   636 00010DF8 E871FFFFFF          <1> 	call	delay1_4ms
   637                              <1> 
   638 00010DFD E89BFFFFFF          <1>         call    codec_io_r16
   639 00010E02 25FFFF0000          <1>         and     eax, 0FFFFh
   640 00010E07 C3                  <1>         retn
   641                              <1> 
   642                              <1> codec_write:
   643                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   644                              <1>         ; Use only primary codec.
   645                              <1>         
   646                              <1> 	; eax = data (volume)
   647                              <1> 	; edx = register (mixer register)
   648                              <1> 	
   649 00010E08 C1E210              <1> 	shl     edx, VIA_REG_AC97_CMD_SHIFT
   650                              <1> 
   651 00010E0B C1E000              <1>         shl     eax, VIA_REG_AC97_DATA_SHIFT ; shl eax, 0
   652 00010E0E 09C2                <1>         or      edx, eax
   653                              <1> 
   654 00010E10 B800000000          <1>         mov     eax, VIA_REG_AC97_CODEC_ID_PRIMARY
   655 00010E15 C1E01E              <1>         shl     eax, VIA_REG_AC97_CODEC_ID_SHIFT
   656 00010E18 09D0                <1>         or      eax, edx
   657                              <1> 
   658 00010E1A E870FFFFFF          <1>         call    codec_io_w16
   659                              <1>         ;mov    [codec.regs+esi], ax
   660                              <1> 
   661                              <1>         ;call	codec_check_ready
   662                              <1>        	;retn
   663                              <1> 	;jmp	short _codec_check_ready	
   664                              <1> 
   665                              <1> codec_check_ready:
   666                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   667                              <1> 
   668                              <1> _codec_check_ready:
   669 00010E1F B914000000          <1> 	mov	ecx, 20	; total 2s
   670                              <1> _ccr_wait:
   671 00010E24 51                  <1> 	push	ecx
   672                              <1> 
   673 00010E25 E873FFFFFF          <1>         call    codec_io_r16
   674 00010E2A A900000001          <1>         test    eax, VIA_REG_AC97_BUSY
   675 00010E2F 740B                <1>         jz      short _ccr_ok
   676                              <1> 
   677 00010E31 E82BFFFFFF          <1> 	call	delay_100ms
   678                              <1> 
   679 00010E36 59                  <1> 	pop	ecx
   680                              <1> 
   681 00010E37 49                  <1> 	dec     ecx
   682 00010E38 75EA                <1>         jnz     short _ccr_wait
   683                              <1> 
   684 00010E3A F9                  <1>         stc
   685 00010E3B C3                  <1>         retn
   686                              <1> 
   687                              <1> _ccr_ok:
   688 00010E3C 59                  <1> 	pop	ecx
   689 00010E3D 25FFFF0000          <1> 	and     eax, 0FFFFh
   690 00010E42 C3                  <1>         retn
   691                              <1> 
   692                              <1> channel_reset:
   693                              <1> 	; 23/03/2017
   694                              <1> 	; 14/11/2016 - Erdogan Tan
   695                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   696 00010E43 BA01000000          <1>         mov	edx, VIA_REG_OFFSET_CONTROL
   697 00010E48 B849000000          <1>         mov     eax, VIA_REG_CTRL_PAUSE + VIA_REG_CTRL_TERMINATE + VIA_REG_CTRL_RESET
   698 00010E4D E859FFFFFF          <1>         call    ctrl_io_w8
   699                              <1> 
   700                              <1>         ;mov	edx, VIA_REG_OFFSET_CONTROL
   701                              <1>         ;call   ctrl_io_r8
   702                              <1> 
   703 00010E52 B90C000000          <1> 	mov	ecx, 12 ; 50 ms	
   704                              <1> _ch_rst_wait:
   705 00010E57 E812FFFFFF          <1> 	call	delay1_4ms
   706 00010E5C 49                  <1> 	dec	ecx
   707 00010E5D 75F8                <1> 	jnz	short _ch_rst_wait     
   708                              <1> 
   709                              <1>         ; disable interrupts
   710 00010E5F BA01000000          <1>         mov	edx, VIA_REG_OFFSET_CONTROL
   711 00010E64 31C0                <1>         xor     eax, eax
   712 00010E66 E840FFFFFF          <1>         call    ctrl_io_w8
   713                              <1> 
   714                              <1>         ; clear interrupts
   715 00010E6B BA00000000          <1>         mov	edx, VIA_REG_OFFSET_STATUS
   716 00010E70 B803000000          <1> 	mov	eax, 3
   717 00010E75 E831FFFFFF          <1>         call	ctrl_io_w8
   718                              <1> 
   719                              <1> 	;mov	edx, VIA_REG_OFFSET_CURR_PTR
   720                              <1> 	;xor	eax, eax
   721                              <1> 	;call	ctrl_io_w32
   722                              <1> 
   723 00010E7A C3                  <1>         retn
   724                              <1> 
   725                              <1> codec_config:
   726                              <1> 	; 21/04/2017
   727                              <1> 	; 16/04/2017 (TRDOS 386 Kernel) 
   728                              <1> 	; 15/11/2016 ('codec.asm', 'player.com')
   729                              <1> 	; 14/11/2016
   730                              <1> 	; 12/11/2016 - Erdogan Tan
   731                              <1> 	;	     (Ref: KolibriOS, 'setup_codec', codec.inc)
   732                              <1> 
   733 00010E7B B802020000          <1> 	mov     eax, 0202h
   734                              <1> 	; 21/04/2017
   735 00010E80 66A3[9A550100]      <1> 	mov	[audio_master_volume], ax
   736 00010E86 66B83131            <1> 	mov	ax, 3131h
   737 00010E8A BA02000000          <1> 	mov	edx, CODEC_MASTER_VOL_REG ; 02h ; Line Out
   738 00010E8F E874FFFFFF          <1> 	call	codec_write
   739                              <1> 	;jc	short cconfig_error
   740                              <1> 
   741                              <1>  	;mov    eax, 0202h
   742 00010E94 66B80202            <1> 	mov     ax, 0202h
   743 00010E98 BA18000000          <1> 	mov	edx, CODEC_PCM_OUT_REG ; 18h ; Wave Output (Stereo)
   744 00010E9D E866FFFFFF          <1> 	call	codec_write
   745                              <1> 	;jc	short cconfig_error
   746                              <1>       
   747                              <1>  	;mov    eax, 0202h
   748 00010EA2 66B80202            <1> 	mov	ax, 0202h
   749 00010EA6 BA04000000          <1> 	mov	edx, CODEC_AUX_VOL ; 04h ; CODEC_HP_VOL_REG ; HeadPhone
   750 00010EAB E858FFFFFF          <1> 	call	codec_write
   751                              <1> 	;jc	short cconfig_error
   752                              <1> 
   753                              <1>  	;mov    eax, 08h
   754 00010EB0 66B80800            <1>         mov     ax,  08h
   755 00010EB4 BA0C000000          <1>         mov	edx, 0Ch  ; AC97_PHONE_VOL ; TAD Input (Mono)
   756 00010EB9 E84AFFFFFF          <1> 	call	codec_write
   757                              <1> 	;jc	short cconfig_error
   758                              <1> 
   759                              <1>  	;mov    eax, 0808h
   760 00010EBE 66B80808            <1>         mov     ax,  0808h
   761 00010EC2 BA10000000          <1>         mov	edx, CODEC_LINE_IN_VOL_REG ; 10h ; Line Input (Stereo)	
   762 00010EC7 E83CFFFFFF          <1> 	call	codec_write
   763                              <1> 	;jc	short cconfig_error
   764                              <1> 
   765                              <1>  	;mov    eax, 0808h
   766 00010ECC 66B80808            <1> 	mov     ax,  0808h
   767 00010ED0 BA12000000          <1>         mov	edx, CODEC_CD_VOL_REG ; 12h ; CR Input (Stereo)
   768 00010ED5 E82EFFFFFF          <1> 	call	codec_write
   769                              <1> 	;jc	short cconfig_error
   770                              <1> 
   771                              <1>  	;mov    eax, 0808h
   772 00010EDA 66B80808            <1> 	mov     ax,  0808h
   773 00010EDE BA16000000          <1>         mov	edx, CODEC_AUX_VOL_REG ; 16h ; Aux Input (Stereo)
   774 00010EE3 E820FFFFFF          <1> 	call	codec_write
   775                              <1> 	;jc	short cconfig_error
   776                              <1> 
   777                              <1> 	; Extended Audio Status (2Ah)
   778 00010EE8 B82A000000          <1> 	mov	eax, CODEC_EXT_AUDIO_CTRL_REG ; 2Ah 
   779 00010EED E8DDFEFFFF          <1> 	call	codec_read
   780 00010EF2 25FDFF0000          <1>         and     eax, 0FFFFh - 2		; clear DRA (BIT1)
   781                              <1>         ;or     eax, 1			; set VRA (BIT0)
   782 00010EF7 83C805              <1> 	or	eax, 5  	; VRA (BIT0) & S/PDIF (BIT2) ; 14/11/2016
   783 00010EFA BA2A000000          <1> 	mov	edx, CODEC_EXT_AUDIO_CTRL_REG
   784 00010EFF E804FFFFFF          <1> 	call	codec_write
   785                              <1> 	;jc	short cconfig_error
   786                              <1> 
   787                              <1> set_sample_rate:
   788                              <1> 	;movzx	eax, word [audio_freq]
   789 00010F04 66A1[96550100]      <1> 	mov	ax, [audio_freq]
   790 00010F0A BA2C000000          <1> 	mov	edx, CODEC_PCM_FRONT_DACRATE_REG ; 2Ch ; PCM Front DAC Rate
   791                              <1>         ;call	codec_write
   792                              <1>         ;retn
   793 00010F0F E9F4FEFFFF          <1> 	jmp	codec_write
   794                              <1> 	
   795                              <1> ;cconfig_error:
   796                              <1> ;	retn
   797                              <1> 
   798                              <1> vt8233_int_handler:
   799                              <1> 	; Interrupt Handler for VIA VT8237R Audio Controller
   800                              <1> 	; Note: called by 'dev_irq_service' 
   801                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
   802                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('player.asm') 
   803                              <1> 
   804 00010F14 50                  <1> 	push	eax
   805 00010F15 52                  <1> 	push	edx
   806 00010F16 51                  <1> 	push	ecx
   807                              <1> 	;push	ebx
   808 00010F17 56                  <1> 	push	esi
   809 00010F18 57                  <1> 	push	edi
   810                              <1> 
   811 00010F19 803D[68550100]01    <1> 	cmp	byte [audio_busy], 1
   812 00010F20 7336                <1> 	jnb	short _ih_busy  ; busy !
   813                              <1> 
   814 00010F22 C605[68550100]01    <1> 	mov	byte [audio_busy], 1
   815                              <1> 
   816 00010F29 C605[99550100]00    <1> 	mov	byte [audio_flag_eol], 0
   817                              <1> 
   818 00010F30 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
   819 00010F34 E87BFEFFFF          <1>         call    ctrl_io_r8
   820                              <1> 
   821 00010F39 A880                <1> 	test    al, VIA_REG_STAT_ACTIVE
   822 00010F3B 740E                <1>         jz      short _ih0
   823                              <1> 
   824 00010F3D 2407                <1>         and     al, VIA_REG_STAT_EOL + VIA_REG_STAT_FLAG + VIA_REG_STAT_STOPPED
   825 00010F3F A2[99550100]        <1> 	mov	[audio_flag_eol], al
   826 00010F44 7405                <1>         jz	short _ih0
   827                              <1> 
   828 00010F46 E82E000000          <1> 	call	vt8233_tuneLoop
   829                              <1> _ih0:
   830 00010F4B C605[68550100]00    <1> 	mov	byte [audio_busy], 0
   831                              <1> ;_p_i_retn:
   832                              <1> ;	mov	al, 20h
   833                              <1> ;	test	byte [audio_intr], 8
   834                              <1> ;	jz	short _ih_1
   835                              <1> ;	out 	0A0h, al ; 20h ; EOI
   836                              <1> ;_ih_1:
   837                              <1> ;	out	20h, al  ; 20h ; EOI
   838                              <1> ;_ih_2:
   839 00010F52 5F                  <1> 	pop	edi
   840 00010F53 5E                  <1> 	pop	esi
   841                              <1> 	;pop	ebx
   842 00010F54 59                  <1> 	pop	ecx
   843 00010F55 5A                  <1> 	pop	edx
   844 00010F56 58                  <1> 	pop	eax
   845                              <1> ;	iretd
   846 00010F57 C3                  <1> 	retn
   847                              <1> 
   848                              <1> _ih_busy:
   849 00010F58 A0[99550100]        <1>         mov     al, [audio_flag_eol]   ;; ack ;;
   850 00010F5D 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
   851 00010F61 E845FEFFFF          <1>         call    ctrl_io_w8
   852                              <1> 
   853                              <1> 	;test	byte [audio_flag_eol], VIA_REG_STAT_FLAG 
   854 00010F66 A801                <1> 	test	al,  VIA_REG_STAT_FLAG 
   855 00010F68 74E1                <1> 	jz	short _ih0
   856                              <1> 
   857 00010F6A B023                <1> 	mov	al, VIA_REG_CTRL_INT
   858 00010F6C 0C80                <1>        	or	al, VIA_REG_CTRL_START
   859 00010F6E 66BA0100            <1>        	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
   860 00010F72 E834FEFFFF          <1>         call    ctrl_io_w8
   861                              <1> 
   862 00010F77 EBD2                <1> 	jmp	short _ih0
   863                              <1> 
   864                              <1> vt8233_tuneLoop:
   865                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
   866                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
   867                              <1> 	; 08/12/2016
   868                              <1> 	; 28/11/2016 - Erdogan Tan
   869                              <1> 	
   870 00010F79 803D[98550100]01    <1> 	cmp	byte [audio_play_cmd], 1
   871 00010F80 7460                <1> 	jz	short _tlp4 ; stop command !
   872                              <1> 
   873 00010F82 8B3D[84550100]      <1> 	mov	edi, [audio_dma_buff]
   874 00010F88 8B0D[88550100]      <1> 	mov	ecx, [audio_dmabuff_size]
   875                              <1> 
   876 00010F8E C605[8C550100]00    <1> 	mov	byte [audio_flag], 0 ; Buffer 1 (next buffer)
   877                              <1> 
   878 00010F95 F605[99550100]02    <1> 	test	byte [audio_flag_eol], VIA_REG_STAT_EOL 
   879 00010F9C 7408                <1> 	jz	short _tlp1 ; FLAG
   880                              <1> 	
   881                              <1> 	; EOL
   882 00010F9E FE05[8C550100]      <1> 	inc	byte [audio_flag] ; 1 ; Buffer 2 (next buffer)
   883 00010FA4 01CF                <1> 	add	edi, ecx
   884                              <1> _tlp1: 
   885 00010FA6 8B35[7C550100]      <1> 	mov	esi, [audio_p_buffer]
   886                              <1> 	;rep	movsb
   887 00010FAC C1E902              <1> 	shr	ecx, 2
   888 00010FAF F3A5                <1> 	rep	movsd 
   889                              <1> 
   890 00010FB1 A0[99550100]        <1>         mov     al, [audio_flag_eol]   ;; ack ;;
   891 00010FB6 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
   892 00010FBA E8ECFDFFFF          <1>         call    ctrl_io_w8
   893                              <1> 
   894 00010FBF F605[99550100]01    <1> 	test	byte [audio_flag_eol], VIA_REG_STAT_FLAG 
   895 00010FC6 7412                <1> 	jz	short _tlp2
   896                              <1> 
   897 00010FC8 B023                <1> 	mov	al, VIA_REG_CTRL_INT
   898 00010FCA 0C80                <1>        	or	al, VIA_REG_CTRL_START
   899 00010FCC 66BA0100            <1>        	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
   900 00010FD0 E8D6FDFFFF          <1>         call    ctrl_io_w8
   901                              <1> 
   902 00010FD5 E845FEFFFF          <1> 	call	codec_check_ready
   903                              <1> _tlp2:	
   904 00010FDA C3                  <1> 	retn
   905                              <1> vt8233_stop: ; 22/04/2017
   906 00010FDB C605[98550100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
   907                              <1> _tlp4:
   908                              <1>         ; finished with song, stop everything
   909 00010FE2 B023                <1> 	mov     al, VIA_REG_CTRL_INT
   910 00010FE4 0C40                <1>         or      al, VIA_REG_CTRL_TERMINATE
   911 00010FE6 66BA0100            <1> 	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
   912 00010FEA E8BCFDFFFF          <1>         call    ctrl_io_w8
   913                              <1> 
   914                              <1>         ;call	channel_reset
   915                              <1> 	;retn
   916 00010FEF E94FFEFFFF          <1> 	jmp	channel_reset
   917                              <1> 
   918                              <1> set_vt8233_bdl: ; Set VT8237R Buffer Descriptor List
   919                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
   920                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
   921                              <1> 	
   922                              <1> 	; eax = dma buffer address = [audio_DMA_buff]
   923                              <1> 	; ecx = dma buffer buffer size = [audio_dmabuff_size]
   924                              <1> 
   925 00010FF4 D1E9                <1> 	shr	ecx, 1 ; dma half buffer size
   926 00010FF6 89CE                <1> 	mov	esi, ecx
   927                              <1> 
   928 00010FF8 8B3D[9C550100]      <1>         mov     edi, [audio_bdl_buff]	; get BDL address
   929 00010FFE B910000000          <1>         mov     ecx, 32 / 2		; make 32 entries in BDL
   930                              <1> 
   931 00011003 EB05                <1> 	jmp	short s_vt8233_bdl1 
   932                              <1> 
   933                              <1> s_vt8233_bdl0:
   934                              <1> 	; set buffer descriptor 0 to start of data file in memory
   935                              <1> 
   936 00011005 A1[84550100]        <1>  	mov	eax, [audio_dma_buff]	; Physical address of DMA buffer
   937                              <1>  
   938                              <1> s_vt8233_bdl1:
   939 0001100A AB                  <1> 	stosd				; store dmabuffer1 address
   940                              <1> 
   941 0001100B 89C2                <1> 	mov	edx, eax
   942                              <1> 
   943                              <1> ; VIA VT8235.PDF: (Page 110) (Erdogan Tan, 29/11/2016)
   944                              <1> 	;
   945                              <1> 	; 	Audio SGD Table Format
   946                              <1> 	;	-------------------------------
   947                              <1> 	;	63   62    61-56    55-32  31-0
   948                              <1> 	;	--   --   --------  -----  ----
   949                              <1> 	;	EOL FLAG -reserved- Base   Base
   950                              <1> 	;		    	    Count  Address
   951                              <1> 	;		            [23:0] [31:0]
   952                              <1> 	;	EOL: End Of Link. 
   953                              <1> 	;	     1 indicates this block is the last of the link.
   954                              <1> 	;	     If the channel Interrupt on EOL bit is set, then
   955                              <1> 	;	     an interrupt is generated at the end of the transfer.
   956                              <1> 	;
   957                              <1> 	;	FLAG: Block Flag. If set, transfer pauses at the end of this
   958                              <1> 	;	      block. If the channel Interrupt on FLAG bit is set,
   959                              <1> 	;	      then an interrupt is generated at the end of this block.
   960                              <1> 
   961 0001100D 89F0                <1> 	mov	eax, esi ; DMA half buffer size
   962 0001100F 01C2                <1> 	add	edx, eax
   963 00011011 0D00000040          <1> 	or	eax, FLAG
   964                              <1> 	;or	eax, EOL
   965 00011016 AB                  <1> 	stosd
   966                              <1> 
   967                              <1> ; 2nd buffer:
   968                              <1> 
   969 00011017 89D0                <1>         mov	eax, edx ; Physical address of the 2nd half of DMA buffer	
   970 00011019 AB                  <1> 	stosd		 ; store dmabuffer2 address
   971                              <1> 
   972                              <1> ; set length to [audio_dmabuff_size]/2
   973                              <1> ; Set control (bits 31:16) to BUP, bits 15:0=number of samples
   974                              <1> ; 
   975 0001101A 89F0                <1> 	mov	eax, esi ; DMA half buffer size
   976 0001101C 0D00000080          <1> 	or	eax, EOL
   977                              <1> 	;or	eax, FLAG
   978 00011021 AB                  <1> 	stosd
   979                              <1> 
   980 00011022 E2E1                <1> 	loop    s_vt8233_bdl0
   981                              <1> 	
   982 00011024 C3                  <1> 	retn
   983                              <1> 
   984                              <1> 
   985                              <1> vt8233_start_play:  
   986                              <1> 	; start to play audio data via VT8233 audio controller 
   987                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
   988                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
   989                              <1> 	; write buffer descriptor list address
   990                              <1> 	;
   991 00011025 B8[9C550100]        <1>         mov	eax, audio_bdl_buff
   992 0001102A C1E004              <1> 	shl	eax, 4
   993                              <1>   
   994                              <1> 	; 12/11/2016 - Erdogan Tan 
   995                              <1> 	; (Ref: KolibriOS, vt823x.asm, 'create_primary_buff')
   996 0001102D BA04000000          <1> 	mov	edx, VIADEV_PLAYBACK + VIA_REG_OFFSET_TABLE_PTR
   997 00011032 E886FDFFFF          <1>         call	ctrl_io_w32
   998                              <1> 
   999 00011037 E8E3FDFFFF          <1> 	call	codec_check_ready
  1000                              <1> 
  1001 0001103C 66BA0200            <1>   	mov	dx, VIADEV_PLAYBACK + VIA_REG_OFS_PLAYBACK_VOLUME_L
  1002                              <1>         ;mov	eax, 2   ;31
  1003 00011040 A0[9A550100]        <1>         mov	al, [audio_master_volume_l] ; 21/04/2017
  1004 00011045 E861FDFFFF          <1> 	call	ctrl_io_w8
  1005                              <1> 
  1006 0001104A E8D0FDFFFF          <1> 	call	codec_check_ready
  1007                              <1> 
  1008 0001104F 66BA0300            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFS_PLAYBACK_VOLUME_R
  1009                              <1>         ;mov	ax, 2   ;31
  1010 00011053 A0[9B550100]        <1>         mov	al, [audio_master_volume_r] ; 21/04/2017
  1011 00011058 E84EFDFFFF          <1> 	call    ctrl_io_w8
  1012                              <1> 
  1013 0001105D E8BDFDFFFF          <1> 	call	codec_check_ready
  1014                              <1> ;
  1015                              <1> ;
  1016                              <1> ; All set.  Let's play some music.
  1017                              <1> ;
  1018                              <1> ;
  1019                              <1>        	;mov    dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STOP_IDX
  1020                              <1>         ;mov    ax, VIA8233_REG_TYPE_16BIT or VIA8233_REG_TYPE_STEREO or 0xfffff or 0xff000000
  1021                              <1>         ;call   ctrl_io_w32
  1022                              <1> 
  1023                              <1> 	;call	codec_check_ready
  1024                              <1> 
  1025                              <1> 	; 08/12/2016
  1026                              <1> 	; 07/10/2016
  1027                              <1>         ;mov    al, 1
  1028 00011062 B01F                <1>         mov	al, 31
  1029 00011064 E819000000          <1> 	call    set_VT8233_LastValidIndex
  1030                              <1> 
  1031 00011069 C605[98550100]01    <1> 	mov	byte [audio_play_cmd], 1 ; play command (do not stop) !
  1032                              <1> 
  1033                              <1> vt8233_play: ; continue to play
  1034                              <1> 	; 22/04/2017
  1035 00011070 B023                <1>         mov	al, VIA_REG_CTRL_INT
  1036 00011072 0C80                <1>        	or	al, VIA_REG_CTRL_START
  1037                              <1>         ;mov	al, VIA_REG_CTRL_AUTOSTART + VIA_REG_CTRL_START
  1038                              <1> 	;mov	al, VIA_REG_CTRL_AUTOSTART + VIA_REG_CTRL_START + VIA_REG_CTRL_INT_FLAG
  1039 00011074 66BA0100            <1> 	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1040 00011078 E82EFDFFFF          <1>         call    ctrl_io_w8
  1041                              <1> 	;call	codec_check_ready
  1042                              <1> 	;retn
  1043 0001107D E99DFDFFFF          <1> 	jmp	codec_check_ready
  1044                              <1> 
  1045                              <1> 
  1046                              <1> ;input AL = index # to stop on
  1047                              <1> set_VT8233_LastValidIndex:
  1048                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
  1049                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
  1050                              <1> 	; 19/11/2016
  1051                              <1> 	; 14/11/2016 - Erdogan Tan (Ref: VIA VT8235.PDF, Page 110)
  1052                              <1> 	; 12/11/2016 - Erdogan Tan
  1053                              <1> 	; (Ref: KolibriOS, vt823x.asm, 'create_primary_buff')
  1054                              <1> 	;push	edx
  1055 00011082 6650                <1> 	push	ax
  1056                              <1> 	;push	ecx
  1057 00011084 0FB705[96550100]    <1> 	movzx	eax, word [audio_freq] ; Hertz
  1058 0001108B BA00001000          <1> 	mov	edx, 100000h ; 2^20 = 1048576
  1059 00011090 F7E2                <1> 	mul	edx
  1060 00011092 B980BB0000          <1> 	mov	ecx, 48000	
  1061 00011097 F7F1                <1> 	div	ecx
  1062                              <1> 	;and	eax, 0FFFFFh
  1063                              <1> 	;pop	ecx
  1064 00011099 665A                <1> 	pop	dx 
  1065 0001109B C1E218              <1> 	shl	edx, 24  ; STOP Index Setting: Bit 24 to 31
  1066 0001109E 09D0                <1> 	or	eax, edx
  1067                              <1> 	; 19/11/2016
  1068 000110A0 803D[94550100]10    <1> 	cmp	byte [audio_bps], 16
  1069 000110A7 7505                <1> 	jne	short sLVI_1
  1070 000110A9 0D00002000          <1> 	or	eax, VIA8233_REG_TYPE_16BIT
  1071                              <1> sLVI_1:
  1072 000110AE 803D[95550100]02    <1> 	cmp	byte [audio_stmo], 2
  1073 000110B5 7505                <1> 	jne	short sLVI_2
  1074 000110B7 0D00001000          <1> 	or	eax, VIA8233_REG_TYPE_STEREO
  1075                              <1> sLVI_2:
  1076 000110BC BA08000000          <1> 	mov     edx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STOP_IDX
  1077 000110C1 E8F7FCFFFF          <1>         call    ctrl_io_w32
  1078 000110C6 E854FDFFFF          <1> 	call	codec_check_ready
  1079                              <1> 	;pop	edx
  1080 000110CB C3                  <1> 	retn
  1081                              <1> 
  1082                              <1> vt8233_pause: ; pause
  1083                              <1> 	; 22/04/2017
  1084 000110CC B023                <1> 	mov     al, VIA_REG_CTRL_INT
  1085 000110CE 0C08                <1>         or      al, VIA_REG_CTRL_PAUSE
  1086 000110D0 66BA0100            <1> 	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1087 000110D4 E8D2FCFFFF          <1>         call    ctrl_io_w8
  1088                              <1> 	;call	codec_check_ready
  1089                              <1> 	;retn
  1090 000110D9 E941FDFFFF          <1> 	jmp	codec_check_ready
  1091                              <1> 
  1092                              <1> vt8233_reset: 
  1093                              <1> 	; 22/04/2017
  1094                              <1> 	; reset VT8237R (vt8233) Audio Controller
  1095                              <1> 	;cmp	byte [audio_play_cmd], 1
  1096                              <1> 	;jna	short vt8233_rst_0
  1097 000110DE C605[98550100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  1098                              <1> vt8233_rst_0:
  1099 000110E5 E827FCFFFF          <1> 	call	reset_codec
  1100 000110EA 720A                <1> 	jc	short vt8233_rst_1 ; codec error !
  1101                              <1> 	; eax = 1
  1102 000110EC E89EFCFFFF          <1> 	call	codec_io_w16 ; w32
  1103 000110F1 E84DFDFFFF          <1> 	call	channel_reset
  1104                              <1> vt8233_rst_1:
  1105 000110F6 C3                  <1> 	retn
  1106                              <1> 
  1107                              <1> vt8233_volume:
  1108                              <1> 	; set VT8237R (vt8233) sound volume level
  1109                              <1> 	; 22/04/2017
  1110                              <1> 	; bl = component (0 = master/playback/lineout volume)
  1111                              <1> 	; cl = left channel volume level (0 to 31)
  1112                              <1> 	; ch = right channel volume level (0 to 31)
  1113                              <1> 
  1114 000110F7 08DB                <1> 	or	bl, bl
  1115 000110F9 7520                <1> 	jnz	short vt8233_vol_1 ; temporary !
  1116 000110FB 66B83131            <1> 	mov	ax, 3131h
  1117 000110FF 38C1                <1> 	cmp	cl, al
  1118 00011101 7718                <1> 	ja	short vt8233_vol_1 ; temporary !
  1119 00011103 38E5                <1> 	cmp	ch, ah
  1120 00011105 7714                <1> 	ja	short vt8233_vol_1 ; temporary !
  1121 00011107 66890D[9A550100]    <1> 	mov	[audio_master_volume], cx
  1122 0001110E 6629C8              <1> 	sub	ax, cx
  1123 00011111 BA02000000          <1> 	mov	edx, CODEC_MASTER_VOL_REG ; 02h ; Line Out
  1124 00011116 E8EDFCFFFF          <1> 	call	codec_write
  1125                              <1> vt8233_vol_1:
  1126 0001111B C3                  <1> 	retn
  2641                                  
  2642                                  align 4
  2643                                  
  2644                                  %include 'vgadata.s' ; 04/07/2016
     1                              <1> ; ****************************************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - vgadata.s  (palette and fond data)
     3                              <1> ; -----------------------------------------------------------------------------
     4                              <1> ; Last Update: 04/07/2016
     5                              <1> ; -----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     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 '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> ; 04/07/2016
    25                              <1> ; COLOR DATA
    26                              <1> 
    27                              <1> palette0:
    28 0001111C 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    28 00011125 00000000000000      <1>
    29 0001112C 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    29 00011135 2A2A2A2A2A2A2A      <1>
    30 0001113C 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    30 00011145 2A2A2A2A2A2A2A      <1>
    31 0001114C 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    31 00011155 2A2A2A2A2A2A2A      <1>
    32 0001115C 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    32 00011165 3F3F3F3F3F3F3F      <1>
    33 0001116C 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    33 00011175 3F3F3F3F3F3F3F      <1>
    34 0001117C 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    34 00011185 00000000000000      <1>
    35 0001118C 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    35 00011195 2A2A2A2A2A2A2A      <1>
    36 0001119C 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    36 000111A5 2A2A2A2A2A2A2A      <1>
    37 000111AC 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    37 000111B5 2A2A2A2A2A2A2A      <1>
    38 000111BC 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    38 000111C5 3F3F3F3F3F3F3F      <1>
    39 000111CC 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    39 000111D5 3F3F3F3F3F3F3F      <1>
    40                              <1> palette1:
    41 000111DC 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    41 000111E5 002A2A2A00002A      <1>
    42 000111EC 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    42 000111F5 000000002A002A      <1>
    43 000111FC 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    43 00011205 2A2A15002A2A2A      <1>
    44 0001120C 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    44 00011215 153F3F3F15153F      <1>
    45 0001121C 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    45 00011225 151515153F153F      <1>
    46 0001122C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    46 00011235 3F3F3F153F3F3F      <1>
    47 0001123C 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    47 00011245 002A2A2A00002A      <1>
    48 0001124C 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    48 00011255 000000002A002A      <1>
    49 0001125C 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    49 00011265 2A2A15002A2A2A      <1>
    50 0001126C 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    50 00011275 153F3F3F15153F      <1>
    51 0001127C 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    51 00011285 151515153F153F      <1>
    52 0001128C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    52 00011295 3F3F3F153F3F3F      <1>
    53                              <1> palette2:
    54 0001129C 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    54 000112A5 002A2A2A00002A      <1>
    55 000112AC 002A2A2A002A2A2A00- <1>     db  000h, 02ah, 02ah, 02ah, 000h, 02ah, 02ah, 02ah, 000h, 000h, 015h, 000h, 000h, 03fh, 000h, 02ah
    55 000112B5 001500003F002A      <1>
    56 000112BC 15002A3F2A00152A00- <1>     db  015h, 000h, 02ah, 03fh, 02ah, 000h, 015h, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 02ah, 02ah, 03fh
    56 000112C5 3F2A2A152A2A3F      <1>
    57 000112CC 00150000152A003F00- <1>     db  000h, 015h, 000h, 000h, 015h, 02ah, 000h, 03fh, 000h, 000h, 03fh, 02ah, 02ah, 015h, 000h, 02ah
    57 000112D5 003F2A2A15002A      <1>
    58 000112DC 152A2A3F002A3F2A00- <1>     db  015h, 02ah, 02ah, 03fh, 000h, 02ah, 03fh, 02ah, 000h, 015h, 015h, 000h, 015h, 03fh, 000h, 03fh
    58 000112E5 151500153F003F      <1>
    59 000112EC 15003F3F2A15152A15- <1>     db  015h, 000h, 03fh, 03fh, 02ah, 015h, 015h, 02ah, 015h, 03fh, 02ah, 03fh, 015h, 02ah, 03fh, 03fh
    59 000112F5 3F2A3F152A3F3F      <1>
    60 000112FC 15000015002A152A00- <1>     db  015h, 000h, 000h, 015h, 000h, 02ah, 015h, 02ah, 000h, 015h, 02ah, 02ah, 03fh, 000h, 000h, 03fh
    60 00011305 152A2A3F00003F      <1>
    61 0001130C 002A3F2A003F2A2A15- <1>     db  000h, 02ah, 03fh, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 000h, 015h, 015h, 000h, 03fh, 015h, 02ah
    61 00011315 001515003F152A      <1>
    62 0001131C 15152A3F3F00153F00- <1>     db  015h, 015h, 02ah, 03fh, 03fh, 000h, 015h, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 03fh, 02ah, 03fh
    62 00011325 3F3F2A153F2A3F      <1>
    63 0001132C 15150015152A153F00- <1>     db  015h, 015h, 000h, 015h, 015h, 02ah, 015h, 03fh, 000h, 015h, 03fh, 02ah, 03fh, 015h, 000h, 03fh
    63 00011335 153F2A3F15003F      <1>
    64 0001133C 152A3F3F003F3F2A15- <1>     db  015h, 02ah, 03fh, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    64 00011345 151515153F153F      <1>
    65 0001134C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    65 00011355 3F3F3F153F3F3F      <1>
    66                              <1> palette3:
    67 0001135C 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    67 00011365 002A2A2A00002A      <1>
    68 0001136C 002A2A15002A2A2A15- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    68 00011375 151515153F153F      <1>
    69 0001137C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    69 00011385 3F3F3F153F3F3F      <1>
    70 0001138C 000000050505080808- <1>     db  000h, 000h, 000h, 005h, 005h, 005h, 008h, 008h, 008h, 00bh, 00bh, 00bh, 00eh, 00eh, 00eh, 011h
    70 00011395 0B0B0B0E0E0E11      <1>
    71 0001139C 11111414141818181C- <1>     db  011h, 011h, 014h, 014h, 014h, 018h, 018h, 018h, 01ch, 01ch, 01ch, 020h, 020h, 020h, 024h, 024h
    71 000113A5 1C1C2020202424      <1>
    72 000113AC 242828282D2D2D3232- <1>     db  024h, 028h, 028h, 028h, 02dh, 02dh, 02dh, 032h, 032h, 032h, 038h, 038h, 038h, 03fh, 03fh, 03fh
    72 000113B5 323838383F3F3F      <1>
    73 000113BC 00003F10003F1F003F- <1>     db  000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 03fh, 03fh
    73 000113C5 2F003F3F003F3F      <1>
    74 000113CC 002F3F001F3F00103F- <1>     db  000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh
    74 000113D5 00003F10003F1F      <1>
    75 000113DC 003F2F003F3F002F3F- <1>     db  000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h
    75 000113E5 001F3F00103F00      <1>
    76 000113EC 003F00003F10003F1F- <1>     db  000h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h
    76 000113F5 003F2F003F3F00      <1>
    77 000113FC 2F3F001F3F00103F1F- <1>     db  02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh
    77 00011405 1F3F271F3F2F1F      <1>
    78 0001140C 3F371F3F3F1F3F3F1F- <1>     db  03fh, 037h, 01fh, 03fh, 03fh, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h
    78 00011415 373F1F2F3F1F27      <1>
    79 0001141C 3F1F1F3F271F3F2F1F- <1>     db  03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h
    79 00011425 3F371F3F3F1F37      <1>
    80 0001142C 3F1F2F3F1F273F1F1F- <1>     db  03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh, 01fh, 01fh, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh
    80 00011435 3F1F1F3F271F3F      <1>
    81 0001143C 2F1F3F371F3F3F1F37- <1>     db  02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh
    81 00011445 3F1F2F3F1F273F      <1>
    82 0001144C 2D2D3F312D3F362D3F- <1>     db  02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03fh, 03fh
    82 00011455 3A2D3F3F2D3F3F      <1>
    83 0001145C 2D3A3F2D363F2D313F- <1>     db  02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h
    83 00011465 2D2D3F312D3F36      <1>
    84 0001146C 2D3F3A2D3F3F2D3A3F- <1>     db  02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh
    84 00011475 2D363F2D313F2D      <1>
    85 0001147C 2D3F2D2D3F312D3F36- <1>     db  02dh, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh
    85 00011485 2D3F3A2D3F3F2D      <1>
    86 0001148C 3A3F2D363F2D313F00- <1>     db  03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h
    86 00011495 001C07001C0E00      <1>
    87 0001149C 1C15001C1C001C1C00- <1>     db  01ch, 015h, 000h, 01ch, 01ch, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h
    87 000114A5 151C000E1C0007      <1>
    88 000114AC 1C00001C07001C0E00- <1>     db  01ch, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h
    88 000114B5 1C15001C1C0015      <1>
    89 000114BC 1C000E1C00071C0000- <1>     db  01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch, 000h, 000h, 01ch, 000h, 000h, 01ch, 007h, 000h, 01ch
    89 000114C5 1C00001C07001C      <1>
    90 000114CC 0E001C15001C1C0015- <1>     db  00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch
    90 000114D5 1C000E1C00071C      <1>
    91 000114DC 0E0E1C110E1C150E1C- <1>     db  00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 01ch, 01ch
    91 000114E5 180E1C1C0E1C1C      <1>
    92 000114EC 0E181C0E151C0E111C- <1>     db  00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h
    92 000114F5 0E0E1C110E1C15      <1>
    93 000114FC 0E1C180E1C1C0E181C- <1>     db  00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh
    93 00011505 0E151C0E111C0E      <1>
    94 0001150C 0E1C0E0E1C110E1C15- <1>     db  00eh, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh
    94 00011515 0E1C180E1C1C0E      <1>
    95 0001151C 181C0E151C0E111C14- <1>     db  018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h
    95 00011525 141C16141C1814      <1>
    96 0001152C 1C1A141C1C141C1C14- <1>     db  01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h
    96 00011535 1A1C14181C1416      <1>
    97 0001153C 1C14141C16141C1814- <1>     db  01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah
    97 00011545 1C1A141C1C141A      <1>
    98 0001154C 1C14181C14161C1414- <1>     db  01ch, 014h, 018h, 01ch, 014h, 016h, 01ch, 014h, 014h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch
    98 00011555 1C14141C16141C      <1>
    99 0001155C 18141C1A141C1C141A- <1>     db  018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h, 01ch
    99 00011565 1C14181C14161C      <1>
   100 0001156C 000010040010080010- <1>     db  000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h, 010h, 010h
   100 00011575 0C001010001010      <1>
   101 0001157C 000C10000810000410- <1>     db  000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h
   101 00011585 00001004001008      <1>
   102 0001158C 00100C001010000C10- <1>     db  000h, 010h, 00ch, 000h, 010h, 010h, 000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h
   102 00011595 00081000041000      <1>
   103 0001159C 001000001004001008- <1>     db  000h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h
   103 000115A5 00100C00101000      <1>
   104 000115AC 0C1000081000041008- <1>     db  00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h
   104 000115B5 08100A08100C08      <1>
   105 000115BC 100E08101008101008- <1>     db  010h, 00eh, 008h, 010h, 010h, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah
   105 000115C5 0E10080C10080A      <1>
   106 000115CC 100808100A08100C08- <1>     db  010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh
   106 000115D5 100E081010080E      <1>
   107 000115DC 10080C10080A100808- <1>     db  010h, 008h, 00ch, 010h, 008h, 00ah, 010h, 008h, 008h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h
   107 000115E5 100808100A0810      <1>
   108 000115EC 0C08100E081010080E- <1>     db  00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah, 010h
   108 000115F5 10080C10080A10      <1>
   109 000115FC 0B0B100C0B100D0B10- <1>     db  00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 010h, 010h
   109 00011605 0F0B10100B1010      <1>
   110 0001160C 0B0F100B0D100B0C10- <1>     db  00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh
   110 00011615 0B0B100C0B100D      <1>
   111 0001161C 0B100F0B10100B0F10- <1>     db  00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh
   111 00011625 0B0D100B0C100B      <1>
   112 0001162C 0B100B0B100C0B100D- <1>     db  00bh, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh
   112 00011635 0B100F0B10100B      <1>
   113 0001163C 0F100B0D100B0C1000- <1>     db  00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   113 00011645 00000000000000      <1>
   114 0001164C 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   114 00011655 00000000000000      <1>
   115                              <1> 
   116                              <1> 
   117                              <1> ; 04/07/2016
   118                              <1> ; FONT DATA
   119                              <1> 
   120                              <1> CRT_CHAR_GEN:
   121                              <1> vgafont8: 
   122 0001165C 00000000000000007E- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 07eh, 081h, 0a5h, 081h, 0bdh, 099h, 081h, 07eh
   122 00011665 81A581BD99817E      <1>
   123 0001166C 7EFFDBFFC3E7FF7E6C- <1>     db  07eh, 0ffh, 0dbh, 0ffh, 0c3h, 0e7h, 0ffh, 07eh, 06ch, 0feh, 0feh, 0feh, 07ch, 038h, 010h, 000h
   123 00011675 FEFEFE7C381000      <1>
   124 0001167C 10387CFE7C38100038- <1>     db  010h, 038h, 07ch, 0feh, 07ch, 038h, 010h, 000h, 038h, 07ch, 038h, 0feh, 0feh, 07ch, 038h, 07ch
   124 00011685 7C38FEFE7C387C      <1>
   125 0001168C 1010387CFE7C387C00- <1>     db  010h, 010h, 038h, 07ch, 0feh, 07ch, 038h, 07ch, 000h, 000h, 018h, 03ch, 03ch, 018h, 000h, 000h
   125 00011695 00183C3C180000      <1>
   126 0001169C FFFFE7C3C3E7FFFF00- <1>     db  0ffh, 0ffh, 0e7h, 0c3h, 0c3h, 0e7h, 0ffh, 0ffh, 000h, 03ch, 066h, 042h, 042h, 066h, 03ch, 000h
   126 000116A5 3C664242663C00      <1>
   127 000116AC FFC399BDBD99C3FF0F- <1>     db  0ffh, 0c3h, 099h, 0bdh, 0bdh, 099h, 0c3h, 0ffh, 00fh, 007h, 00fh, 07dh, 0cch, 0cch, 0cch, 078h
   127 000116B5 070F7DCCCCCC78      <1>
   128 000116BC 3C6666663C187E183F- <1>     db  03ch, 066h, 066h, 066h, 03ch, 018h, 07eh, 018h, 03fh, 033h, 03fh, 030h, 030h, 070h, 0f0h, 0e0h
   128 000116C5 333F303070F0E0      <1>
   129 000116CC 7F637F636367E6C099- <1>     db  07fh, 063h, 07fh, 063h, 063h, 067h, 0e6h, 0c0h, 099h, 05ah, 03ch, 0e7h, 0e7h, 03ch, 05ah, 099h
   129 000116D5 5A3CE7E73C5A99      <1>
   130 000116DC 80E0F8FEF8E0800002- <1>     db  080h, 0e0h, 0f8h, 0feh, 0f8h, 0e0h, 080h, 000h, 002h, 00eh, 03eh, 0feh, 03eh, 00eh, 002h, 000h
   130 000116E5 0E3EFE3E0E0200      <1>
   131 000116EC 183C7E18187E3C1866- <1>     db  018h, 03ch, 07eh, 018h, 018h, 07eh, 03ch, 018h, 066h, 066h, 066h, 066h, 066h, 000h, 066h, 000h
   131 000116F5 66666666006600      <1>
   132 000116FC 7FDBDB7B1B1B1B003E- <1>     db  07fh, 0dbh, 0dbh, 07bh, 01bh, 01bh, 01bh, 000h, 03eh, 063h, 038h, 06ch, 06ch, 038h, 0cch, 078h
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   250                              <1> vgafont14:
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   263 00011F25 63636367E7E6C0      <1>
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   273 00011FC5 00000000000000      <1>
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   275 00011FE5 00000000C0C0C0      <1>
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   276 00011FF5 00286CFE6C2800      <1>
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   281 00012045 0000006C6CFE6C      <1>
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   289 000120C5 00000000000000      <1>
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   291 000120E5 00000000181800      <1>
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   444 00012A75 F0F0F0F0F0F0F0      <1>
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   445 00012A85 0F0F0F0F0F0F0F      <1>
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   452 00012AF5 6666667C6060C0      <1>
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   454 00012B15 187E0000000000      <1>
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   455 00012B25 0000000000386C      <1>
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   456 00012B35 0000001E30180C      <1>
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   574 00013285 66667C00000000      <1>
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   577 000132B5 C0C67C00000000      <1>
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   578 000132C5 6060F000000000      <1>
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   579 000132D5 CCCC7C0CCC7800      <1>
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   580 000132E5 6666E600000000      <1>
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   581 000132F5 18183C00000000      <1>
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   582 00013305 06060666663C00      <1>
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   583 00013315 6C66E600000000      <1>
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   584 00013325 18183C00000000      <1>
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   585 00013335 DBDBDB00000000      <1>
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   586 00013345 66666600000000      <1>
   587 0001334C 00000000007CC6C6C6- <1>     db  000h, 000h, 000h, 000h, 000h, 07ch, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 07ch, 000h, 000h, 000h, 000h
   587 00013355 C6C67C00000000      <1>
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   588 00013365 66667C6060F000      <1>
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   589 00013375 CCCC7C0C0C1E00      <1>
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   590 00013385 6060F000000000      <1>
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   591 00013395 0CC67C00000000      <1>
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   592 000133A5 30361C00000000      <1>
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   593 000133B5 CCCC7600000000      <1>
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   594 000133C5 663C1800000000      <1>
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   595 000133D5 DBFF6600000000      <1>
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   596 000133E5 3C66C300000000      <1>
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   597 000133F5 C6C67E060CF800      <1>
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   599 00013415 18180E00000000      <1>
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   600 00013425 18181800000000      <1>
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   602 00013445 00000000000000      <1>
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   605 00013475 CCCC7600000000      <1>
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   606 00013485 C0C67C00000000      <1>
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   607 00013495 CCCC7600000000      <1>
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   608 000134A5 CCCC7600000000      <1>
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   609 000134B5 CCCC7600000000      <1>
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   610 000134C5 CCCC7600000000      <1>
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   611 000134D5 3C0C063C000000      <1>
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   612 000134E5 C0C67C00000000      <1>
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   613 000134F5 C0C67C00000000      <1>
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   614 00013505 C0C67C00000000      <1>
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   615 00013515 18183C00000000      <1>
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   616 00013525 18183C00000000      <1>
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   617 00013535 18183C00000000      <1>
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   618 00013545 C6C6C600000000      <1>
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   619 00013555 C6C6C600000000      <1>
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   620 00013565 6066FE00000000      <1>
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   621 00013575 D8DC7700000000      <1>
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   622 00013585 CCCCCE00000000      <1>
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   623 00013595 C6C67C00000000      <1>
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   705 00013AAC 00000000007ED8D8D8- <1>     db  000h, 000h, 000h, 000h, 000h, 07eh, 0d8h, 0d8h, 0d8h, 0d8h, 0d8h, 070h, 000h, 000h, 000h, 000h
   705 00013AB5 D8D87000000000      <1>
   706 00013ABC 000000006666666666- <1>     db  000h, 000h, 000h, 000h, 066h, 066h, 066h, 066h, 066h, 07ch, 060h, 060h, 0c0h, 000h, 000h, 000h
   706 00013AC5 7C6060C0000000      <1>
   707 00013ACC 0000000076DC181818- <1>     db  000h, 000h, 000h, 000h, 076h, 0dch, 018h, 018h, 018h, 018h, 018h, 018h, 000h, 000h, 000h, 000h
   707 00013AD5 18181800000000      <1>
   708 00013ADC 0000007E183C666666- <1>     db  000h, 000h, 000h, 07eh, 018h, 03ch, 066h, 066h, 066h, 03ch, 018h, 07eh, 000h, 000h, 000h, 000h
   708 00013AE5 3C187E00000000      <1>
   709 00013AEC 000000386CC6C6FEC6- <1>     db  000h, 000h, 000h, 038h, 06ch, 0c6h, 0c6h, 0feh, 0c6h, 0c6h, 06ch, 038h, 000h, 000h, 000h, 000h
   709 00013AF5 C66C3800000000      <1>
   710 00013AFC 0000386CC6C6C66C6C- <1>     db  000h, 000h, 038h, 06ch, 0c6h, 0c6h, 0c6h, 06ch, 06ch, 06ch, 06ch, 0eeh, 000h, 000h, 000h, 000h
   710 00013B05 6C6CEE00000000      <1>
   711 00013B0C 00001E30180C3E6666- <1>     db  000h, 000h, 01eh, 030h, 018h, 00ch, 03eh, 066h, 066h, 066h, 066h, 03ch, 000h, 000h, 000h, 000h
   711 00013B15 66663C00000000      <1>
   712 00013B1C 00000000007EDBDBDB- <1>     db  000h, 000h, 000h, 000h, 000h, 07eh, 0dbh, 0dbh, 0dbh, 07eh, 000h, 000h, 000h, 000h, 000h, 000h
   712 00013B25 7E000000000000      <1>
   713 00013B2C 00000003067EDBDBF3- <1>     db  000h, 000h, 000h, 003h, 006h, 07eh, 0dbh, 0dbh, 0f3h, 07eh, 060h, 0c0h, 000h, 000h, 000h, 000h
   713 00013B35 7E60C000000000      <1>
   714 00013B3C 00001C3060607C6060- <1>     db  000h, 000h, 01ch, 030h, 060h, 060h, 07ch, 060h, 060h, 060h, 030h, 01ch, 000h, 000h, 000h, 000h
   714 00013B45 60301C00000000      <1>
   715 00013B4C 0000007CC6C6C6C6C6- <1>     db  000h, 000h, 000h, 07ch, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 000h, 000h, 000h, 000h
   715 00013B55 C6C6C600000000      <1>
   716 00013B5C 00000000FE0000FE00- <1>     db  000h, 000h, 000h, 000h, 0feh, 000h, 000h, 0feh, 000h, 000h, 0feh, 000h, 000h, 000h, 000h, 000h
   716 00013B65 00FE0000000000      <1>
   717 00013B6C 0000000018187E1818- <1>     db  000h, 000h, 000h, 000h, 018h, 018h, 07eh, 018h, 018h, 000h, 000h, 0ffh, 000h, 000h, 000h, 000h
   717 00013B75 0000FF00000000      <1>
   718 00013B7C 00000030180C060C18- <1>     db  000h, 000h, 000h, 030h, 018h, 00ch, 006h, 00ch, 018h, 030h, 000h, 07eh, 000h, 000h, 000h, 000h
   718 00013B85 30007E00000000      <1>
   719 00013B8C 0000000C1830603018- <1>     db  000h, 000h, 000h, 00ch, 018h, 030h, 060h, 030h, 018h, 00ch, 000h, 07eh, 000h, 000h, 000h, 000h
   719 00013B95 0C007E00000000      <1>
   720 00013B9C 00000E1B1B18181818- <1>     db  000h, 000h, 00eh, 01bh, 01bh, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h
   720 00013BA5 18181818181818      <1>
   721 00013BAC 1818181818181818D8- <1>     db  018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 0d8h, 0d8h, 0d8h, 070h, 000h, 000h, 000h, 000h
   721 00013BB5 D8D87000000000      <1>
   722 00013BBC 000000001818007E00- <1>     db  000h, 000h, 000h, 000h, 018h, 018h, 000h, 07eh, 000h, 018h, 018h, 000h, 000h, 000h, 000h, 000h
   722 00013BC5 18180000000000      <1>
   723 00013BCC 000000000076DC0076- <1>     db  000h, 000h, 000h, 000h, 000h, 076h, 0dch, 000h, 076h, 0dch, 000h, 000h, 000h, 000h, 000h, 000h
   723 00013BD5 DC000000000000      <1>
   724 00013BDC 00386C6C3800000000- <1>     db  000h, 038h, 06ch, 06ch, 038h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   724 00013BE5 00000000000000      <1>
   725 00013BEC 000000000000001818- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   725 00013BF5 00000000000000      <1>
   726 00013BFC 000000000000000018- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   726 00013C05 00000000000000      <1>
   727 00013C0C 000F0C0C0C0C0CEC6C- <1>     db  000h, 00fh, 00ch, 00ch, 00ch, 00ch, 00ch, 0ech, 06ch, 06ch, 03ch, 01ch, 000h, 000h, 000h, 000h
   727 00013C15 6C3C1C00000000      <1>
   728 00013C1C 00D86C6C6C6C6C0000- <1>     db  000h, 0d8h, 06ch, 06ch, 06ch, 06ch, 06ch, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   728 00013C25 00000000000000      <1>
   729 00013C2C 0070D83060C8F80000- <1>     db  000h, 070h, 0d8h, 030h, 060h, 0c8h, 0f8h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   729 00013C35 00000000000000      <1>
   730 00013C3C 000000007C7C7C7C7C- <1>     db  000h, 000h, 000h, 000h, 07ch, 07ch, 07ch, 07ch, 07ch, 07ch, 07ch, 000h, 000h, 000h, 000h, 000h
   730 00013C45 7C7C0000000000      <1>
   731 00013C4C 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   731 00013C55 00000000000000      <1>
   732                              <1> vgafont14alt:
   733 00013C5C 1D000000002466FF66- <1>     db  01dh, 000h, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h, 000h, 000h, 000h, 022h
   733 00013C65 24000000000022      <1>
   734 00013C6C 006363632200000000- <1>     db  000h, 063h, 063h, 063h, 022h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02bh, 000h
   734 00013C75 00000000002B00      <1>
   735 00013C7C 0000181818FF181818- <1>     db  000h, 000h, 018h, 018h, 018h, 0ffh, 018h, 018h, 018h, 000h, 000h, 000h, 000h, 02dh, 000h, 000h
   735 00013C85 000000002D0000      <1>
   736 00013C8C 00000000FF00000000- <1>     db  000h, 000h, 000h, 000h, 0ffh, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 04dh, 000h, 000h, 0c3h
   736 00013C95 0000004D0000C3      <1>
   737 00013C9C E7FFDBC3C3C3C3C300- <1>     db  0e7h, 0ffh, 0dbh, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 000h, 000h, 000h, 054h, 000h, 000h, 0ffh, 0dbh
   737 00013CA5 0000540000FFDB      <1>
   738 00013CAC 9918181818183C0000- <1>     db  099h, 018h, 018h, 018h, 018h, 018h, 03ch, 000h, 000h, 000h, 056h, 000h, 000h, 0c3h, 0c3h, 0c3h
   738 00013CB5 00560000C3C3C3      <1>
   739 00013CBC C3C3C3663C18000000- <1>     db  0c3h, 0c3h, 0c3h, 066h, 03ch, 018h, 000h, 000h, 000h, 057h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h
   739 00013CC5 570000C3C3C3C3      <1>
   740 00013CCC DBDBFF666600000058- <1>     db  0dbh, 0dbh, 0ffh, 066h, 066h, 000h, 000h, 000h, 058h, 000h, 000h, 0c3h, 0c3h, 066h, 03ch, 018h
   740 00013CD5 0000C3C3663C18      <1>
   741 00013CDC 3C66C3C30000005900- <1>     db  03ch, 066h, 0c3h, 0c3h, 000h, 000h, 000h, 059h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   741 00013CE5 00C3C3C3663C18      <1>
   742 00013CEC 18183C0000005A0000- <1>     db  018h, 018h, 03ch, 000h, 000h, 000h, 05ah, 000h, 000h, 0ffh, 0c3h, 086h, 00ch, 018h, 030h, 061h
   742 00013CF5 FFC3860C183061      <1>
   743 00013CFC C3FF0000006D000000- <1>     db  0c3h, 0ffh, 000h, 000h, 000h, 06dh, 000h, 000h, 000h, 000h, 000h, 0e6h, 0ffh, 0dbh, 0dbh, 0dbh
   743 00013D05 0000E6FFDBDBDB      <1>
   744 00013D0C DB0000007600000000- <1>     db  0dbh, 000h, 000h, 000h, 076h, 000h, 000h, 000h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   744 00013D15 00C3C3C3663C18      <1>
   745 00013D1C 000000770000000000- <1>     db  000h, 000h, 000h, 077h, 000h, 000h, 000h, 000h, 000h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh, 066h, 000h
   745 00013D25 C3C3DBDBFF6600      <1>
   746 00013D2C 000091000000006E3B- <1>     db  000h, 000h, 091h, 000h, 000h, 000h, 000h, 06eh, 03bh, 01bh, 07eh, 0d8h, 0dch, 077h, 000h, 000h
   746 00013D35 1B7ED8DC770000      <1>
   747 00013D3C 009B0018187EC3C0C0- <1>     db  000h, 09bh, 000h, 018h, 018h, 07eh, 0c3h, 0c0h, 0c0h, 0c3h, 07eh, 018h, 018h, 000h, 000h, 000h
   747 00013D45 C37E1818000000      <1>
   748 00013D4C 9D0000C3663C18FF18- <1>     db  09dh, 000h, 000h, 0c3h, 066h, 03ch, 018h, 0ffh, 018h, 0ffh, 018h, 018h, 000h, 000h, 000h, 09eh
   748 00013D55 FF18180000009E      <1>
   749 00013D5C 00FC66667C62666F66- <1>     db  000h, 0fch, 066h, 066h, 07ch, 062h, 066h, 06fh, 066h, 066h, 0f3h, 000h, 000h, 000h, 0f1h, 000h
   749 00013D65 66F3000000F100      <1>
   750 00013D6C 00181818FF18181800- <1>     db  000h, 018h, 018h, 018h, 0ffh, 018h, 018h, 018h, 000h, 0ffh, 000h, 000h, 000h, 0f6h, 000h, 000h
   750 00013D75 FF000000F60000      <1>
   751 00013D7C 18180000FF00001818- <1>     db  018h, 018h, 000h, 000h, 0ffh, 000h, 000h, 018h, 018h, 000h, 000h, 000h, 000h
   751 00013D85 00000000            <1>
   752                              <1> vgafont16alt:
   753 00013D89 1D00000000002466FF- <1>     db  01dh, 000h, 000h, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h, 000h, 000h, 000h
   753 00013D92 66240000000000      <1>
   754 00013D99 003000003C66C3C3DB- <1>     db  000h, 030h, 000h, 000h, 03ch, 066h, 0c3h, 0c3h, 0dbh, 0dbh, 0c3h, 0c3h, 066h, 03ch, 000h, 000h
   754 00013DA2 DBC3C3663C0000      <1>
   755 00013DA9 00004D0000C3E7FFFF- <1>     db  000h, 000h, 04dh, 000h, 000h, 0c3h, 0e7h, 0ffh, 0ffh, 0dbh, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 000h
   755 00013DB2 DBC3C3C3C3C300      <1>
   756 00013DB9 000000540000FFDB99- <1>     db  000h, 000h, 000h, 054h, 000h, 000h, 0ffh, 0dbh, 099h, 018h, 018h, 018h, 018h, 018h, 018h, 03ch
   756 00013DC2 1818181818183C      <1>
   757 00013DC9 00000000560000C3C3- <1>     db  000h, 000h, 000h, 000h, 056h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch
   757 00013DD2 C3C3C3C3C3663C      <1>
   758 00013DD9 1800000000570000C3- <1>     db  018h, 000h, 000h, 000h, 000h, 057h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh
   758 00013DE2 C3C3C3C3DBDBFF      <1>
   759 00013DE9 666600000000580000- <1>     db  066h, 066h, 000h, 000h, 000h, 000h, 058h, 000h, 000h, 0c3h, 0c3h, 066h, 03ch, 018h, 018h, 03ch
   759 00013DF2 C3C3663C18183C      <1>
   760 00013DF9 66C3C3000000005900- <1>     db  066h, 0c3h, 0c3h, 000h, 000h, 000h, 000h, 059h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   760 00013E02 00C3C3C3663C18      <1>
   761 00013E09 1818183C000000005A- <1>     db  018h, 018h, 018h, 03ch, 000h, 000h, 000h, 000h, 05ah, 000h, 000h, 0ffh, 0c3h, 086h, 00ch, 018h
   761 00013E12 0000FFC3860C18      <1>
   762 00013E19 3060C1C3FF00000000- <1>     db  030h, 060h, 0c1h, 0c3h, 0ffh, 000h, 000h, 000h, 000h, 06dh, 000h, 000h, 000h, 000h, 000h, 0e6h
   762 00013E22 6D0000000000E6      <1>
   763 00013E29 FFDBDBDBDBDB000000- <1>     db  0ffh, 0dbh, 0dbh, 0dbh, 0dbh, 0dbh, 000h, 000h, 000h, 000h, 076h, 000h, 000h, 000h, 000h, 000h
   763 00013E32 00760000000000      <1>
   764 00013E39 C3C3C3C3663C180000- <1>     db  0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h, 000h, 000h, 000h, 000h, 077h, 000h, 000h, 000h, 000h
   764 00013E42 00007700000000      <1>
   765 00013E49 00C3C3C3DBDBFF6600- <1>     db  000h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh, 066h, 000h, 000h, 000h, 000h, 078h, 000h, 000h, 000h
   765 00013E52 00000078000000      <1>
   766 00013E59 0000C3663C183C66C3- <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 03ch, 066h, 0c3h, 000h, 000h, 000h, 000h, 091h, 000h, 000h
   766 00013E62 00000000910000      <1>
   767 00013E69 0000006E3B1B7ED8DC- <1>     db  000h, 000h, 000h, 06eh, 03bh, 01bh, 07eh, 0d8h, 0dch, 077h, 000h, 000h, 000h, 000h, 09bh, 000h
   767 00013E72 77000000009B00      <1>
   768 00013E79 18187EC3C0C0C0C37E- <1>     db  018h, 018h, 07eh, 0c3h, 0c0h, 0c0h, 0c0h, 0c3h, 07eh, 018h, 018h, 000h, 000h, 000h, 000h, 09dh
   768 00013E82 1818000000009D      <1>
   769 00013E89 0000C3663C18FF18FF- <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 0ffh, 018h, 0ffh, 018h, 018h, 018h, 000h, 000h, 000h, 000h
   769 00013E92 18181800000000      <1>
   770 00013E99 9E00FC66667C62666F- <1>     db  09eh, 000h, 0fch, 066h, 066h, 07ch, 062h, 066h, 06fh, 066h, 066h, 066h, 0f3h, 000h, 000h, 000h
   770 00013EA2 666666F3000000      <1>
   771 00013EA9 00AB00C0C0C2C6CC18- <1>     db  000h, 0abh, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 060h, 0ceh, 09bh, 006h, 00ch, 01fh
   771 00013EB2 3060CE9B060C1F      <1>
   772 00013EB9 0000AC00C0C0C2C6CC- <1>     db  000h, 000h, 0ach, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 066h, 0ceh, 096h, 03eh, 006h
   772 00013EC2 183066CE963E06      <1>
   773 00013EC9 06000000            <1>     db  006h, 000h, 000h, 000h
  2645                                  
  2646 00013ECD 90                      align 2
  2647                                  
  2648                                  ; EPOCH Variables
  2649                                  ; 13/04/2015 - Retro UNIX 386 v1 Beginning
  2650                                  ; 09/04/2013 epoch variables
  2651                                  ; Retro UNIX 8086 v1 Prototype: UNIXCOPY.ASM, 10/03/2013
  2652                                  ;
  2653 00013ECE B207                    year: 	dw 1970
  2654 00013ED0 0100                    month: 	dw 1
  2655 00013ED2 0100                    day: 	dw 1
  2656 00013ED4 0000                    hour: 	dw 0
  2657 00013ED6 0000                    minute: dw 0
  2658 00013ED8 0000                    second: dw 0
  2659                                  
  2660                                  DMonth:
  2661 00013EDA 0000                    	dw 0
  2662 00013EDC 1F00                    	dw 31
  2663 00013EDE 3B00                    	dw 59
  2664 00013EE0 5A00                    	dw 90
  2665 00013EE2 7800                    	dw 120
  2666 00013EE4 9700                    	dw 151
  2667 00013EE6 B500                    	dw 181
  2668 00013EE8 D400                    	dw 212
  2669 00013EEA F300                    	dw 243
  2670 00013EEC 1101                    	dw 273
  2671 00013EEE 3001                    	dw 304
  2672 00013EF0 4E01                    	dw 334
  2673                                  
  2674                                  ; 20/02/2017
  2675                                  KERNELFSIZE  equ $  ; 04/07/2016
  2676                                  
  2677                                  bss_start:
  2678                                  
  2679                                  ABSOLUTE bss_start
  2680                                  
  2681 00013EF2 <res 00000006>          alignb 8 ; 25/12/2016
  2682                                  
  2683                                  	; 15/04/2016
  2684                                  	; TRDOS 386 (TRDOS v2.0)
  2685                                  	; 	80 interrupts 	
  2686                                  	; 11/03/2015
  2687                                  	; Interrupt Descriptor Table (20/08/2014)
  2688                                  idt:
  2689                                  	;resb	64*8 ; INT 0 to INT 3Fh
  2690                                  	; 15/04/2016
  2691 00013EF8 <res 00000280>          	resb	80*8 ; INT 0 to INT 4Fh
  2692                                  
  2693                                  idt_end:
  2694                                  
  2695                                  ;alignb 4
  2696                                  
  2697                                  task_state_segment:
  2698                                  	; 24/03/2015
  2699 00014178 <res 00000002>          tss.link:   resw 1
  2700 0001417A <res 00000002>          	    resw 1
  2701                                  ; tss offset 4	
  2702 0001417C <res 00000004>          tss.esp0:   resd 1
  2703 00014180 <res 00000002>          tss.ss0:    resw 1
  2704 00014182 <res 00000002>          	    resw 1	
  2705 00014184 <res 00000004>          tss.esp1:   resd 1
  2706 00014188 <res 00000002>          tss.ss1:    resw 1
  2707 0001418A <res 00000002>          	    resw 1 	
  2708 0001418C <res 00000004>          tss.esp2:   resd 1
  2709 00014190 <res 00000002>          tss.ss2:    resw 1
  2710 00014192 <res 00000002>          	    resw 1
  2711                                  ; tss offset 28
  2712 00014194 <res 00000004>          tss.CR3:    resd 1
  2713 00014198 <res 00000004>          tss.eip:    resd 1
  2714 0001419C <res 00000004>          tss.eflags: resd 1
  2715                                  ; tss offset 40
  2716 000141A0 <res 00000004>          tss.eax:    resd 1		 		
  2717 000141A4 <res 00000004>          tss.ecx:    resd 1
  2718 000141A8 <res 00000004>          tss.edx:    resd 1
  2719 000141AC <res 00000004>          tss.ebx:    resd 1
  2720 000141B0 <res 00000004>          tss.esp:    resd 1
  2721 000141B4 <res 00000004>          tss.ebp:    resd 1
  2722 000141B8 <res 00000004>          tss.esi:    resd 1
  2723 000141BC <res 00000004>          tss.edi:    resd 1
  2724                                  ; tss offset 72
  2725 000141C0 <res 00000002>          tss.ES:     resw 1
  2726 000141C2 <res 00000002>          	    resw 1	
  2727 000141C4 <res 00000002>          tss.CS:	    resw 1
  2728 000141C6 <res 00000002>          	    resw 1
  2729 000141C8 <res 00000002>          tss.SS:	    resw 1
  2730 000141CA <res 00000002>          	    resw 1
  2731 000141CC <res 00000002>          tss.DS:	    resw 1
  2732 000141CE <res 00000002>          	    resw 1
  2733 000141D0 <res 00000002>          tss.FS:	    resw 1
  2734 000141D2 <res 00000002>          	    resw 1
  2735 000141D4 <res 00000002>          tss.GS:	    resw 1
  2736 000141D6 <res 00000002>          	    resw 1		
  2737 000141D8 <res 00000002>          tss.LDTR:   resw 1
  2738 000141DA <res 00000002>          	    resw 1
  2739                                  ; tss offset 100		
  2740 000141DC <res 00000002>          	    resw 1		
  2741 000141DE <res 00000002>          tss.IOPB:   resw 1
  2742                                  ; tss offset 104 
  2743                                  tss_end:
  2744                                  
  2745 000141E0 <res 00000004>          k_page_dir:  resd 1 ; Kernel's (System) Page Directory address
  2746                                  		    ; (Physical address = Virtual address)	 	
  2747 000141E4 <res 00000004>          memory_size: resd 1 ; memory size in pages
  2748 000141E8 <res 00000004>          free_pages:  resd 1 ; number of free pages		
  2749 000141EC <res 00000004>          next_page:   resd 1 ; offset value in M.A.T. for
  2750                                  		    ; first free page search
  2751 000141F0 <res 00000004>          last_page:   resd 1 ; offset value in M.A.T. which
  2752                                  		    ; next free page search will be
  2753                                  		    ; stopped after it. (end of M.A.T.)
  2754 000141F4 <res 00000004>          first_page:  resd 1 ; offset value in M.A.T. which
  2755                                  		    ; first free page search
  2756                                  		    ; will be started on it. (for user)
  2757 000141F8 <res 00000004>          mat_size:    resd 1 ; Memory Allocation Table size in pages		
  2758                                  
  2759                                  ; 02/09/2014 (Retro UNIX 386 v1)
  2760                                  ; 04/12/2013 (Retro UNIX 8086 v1)
  2761 000141FC <res 00000002>          CRT_START:   resw 1 	  ; starting address in regen buffer
  2762                                  			  ; NOTE: active page only	
  2763 000141FE <res 00000010>          CURSOR_POSN: resw 8 ; cursor positions for video pages
  2764                                  ACTIVE_PAGE: 
  2765 0001420E <res 00000001>          ptty: 	     resb 1 ; current tty
  2766                                  ; 01/07/2015 - 29/01/2016
  2767 0001420F <res 00000001>          ccolor:	     resb 1 ; current color attribute
  2768                                  ; 26/10/2015
  2769                                  ; 07/09/2014
  2770 00014210 <res 00000014>          ttychr:      resw ntty+2 ; Character buffer (multiscreen)
  2771                                  
  2772                                  ; 18/05/2015 (03/06/2013 - Retro UNIX 8086 v1 feature only!)
  2773 00014224 <res 00000004>          p_time:      resd 1     ; present time (for systime & sysmdate)
  2774                                  
  2775                                  ; 18/05/2015 (16/08/2013 - Retro UNIX 8086 v1 feature only !)
  2776                                  ; (open mode locks for pseudo TTYs)
  2777                                  ; [ major tty locks (return error in any conflicts) ]
  2778 00014228 <res 00000014>          ttyl:        resw ntty+2 ; opening locks for TTYs.
  2779                                  
  2780                                  ; 15/04/2015 (Retro UNIX 386 v1)
  2781                                  ; 22/09/2013 (Retro UNIX 8086 v1)
  2782 0001423C <res 0000000A>          wlist:       resb ntty+2 ; wait channel list (0 to 9 for TTYs)
  2783                                  ; 15/04/2015 (Retro UNIX 386 v1)
  2784                                  ;; 12/07/2014 -> sp_init set comm. parameters as 0E3h
  2785                                  ;; 0 means serial port is not available 
  2786                                  ;;comprm: ; 25/06/2014
  2787 00014246 <res 00000001>          com1p:       resb 1  ;;0E3h
  2788 00014247 <res 00000001>          com2p:       resb 1  ;;0E3h
  2789                                  
  2790                                  ; 17/11/2015
  2791                                  ; request for response (from the terminal)	
  2792 00014248 <res 00000002>          req_resp:    resw 1 			
  2793                                  ; 07/11/2015
  2794 0001424A <res 00000001>          ccomport:    resb 1 ; current COM (serial) port
  2795                                  		    ; (0= COM1, 1= COM2)
  2796                                  ; 09/11/2015
  2797 0001424B <res 00000001>          comqr:	     resb 1 ; 'query or response' sign (u9.s, 'sndc')
  2798                                  ; 07/11/2015
  2799 0001424C <res 00000002>          rchar:	     resw 1 ; last received char for COM 1 and COM 2		
  2800 0001424E <res 00000002>          schar:	     resw 1 ; last sent char for COM 1 and COM 2
  2801                                  
  2802                                  ; 22/08/2014 (RTC)
  2803                                  ; (Packed BCD)
  2804 00014250 <res 00000001>          time_seconds: resb 1
  2805 00014251 <res 00000001>          time_minutes: resb 1
  2806 00014252 <res 00000001>          time_hours:   resb 1
  2807 00014253 <res 00000001>          date_wday:    resb 1
  2808 00014254 <res 00000001>          date_day:     resb 1
  2809 00014255 <res 00000001>          date_month:   resb 1			
  2810 00014256 <res 00000001>          date_year:    resb 1
  2811 00014257 <res 00000001>          date_century: resb 1
  2812                                  
  2813                                  ; 24/01/2016
  2814 00014258 <res 00000004>          RTC_LH:	       resd 1
  2815 0001425C <res 00000001>          RTC_WAIT_FLAG: resb 1
  2816 0001425D <res 00000001>          USER_FLAG:     resb 1
  2817                                  ; 19/05/2016
  2818                                  ;RTC_second:
  2819 0001425E <res 00000001>          RTC_2Hz:       resb 1 ;  from 2Hz interrupt to 1Hz timer event function	
  2820                                  
  2821                                  %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 0001425F <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 00014260 <res 00000002>      <1> TIMER_LOW:      resw	1               ; LOW WORD OF TIMER COUNT
    31 00014262 <res 00000002>      <1> TIMER_HIGH:     resw	1               ; HIGH WORD OF TIMER COUNT
    32 00014264 <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 00014265 <res 00000001>      <1> SEEK_STATUS:	resb	1
    39 00014266 <res 00000001>      <1> MOTOR_STATUS:	resb	1
    40 00014267 <res 00000001>      <1> MOTOR_COUNT:	resb	1
    41 00014268 <res 00000001>      <1> DSKETTE_STATUS:	resb	1
    42 00014269 <res 00000007>      <1> NEC_STATUS:	resb	7
    43                              <1> 
    44                              <1> ;----------------------------------------
    45                              <1> ;	ADDITIONAL MEDIA DATA		:
    46                              <1> ;----------------------------------------
    47                              <1> 
    48 00014270 <res 00000001>      <1> LASTRATE:	resb 	1
    49 00014271 <res 00000001>      <1> HF_STATUS:	resb 	1
    50 00014272 <res 00000001>      <1> HF_ERROR:	resb 	1
    51 00014273 <res 00000001>      <1> HF_INT_FLAG:	resb 	1
    52 00014274 <res 00000001>      <1> HF_CNTRL:	resb 	1
    53 00014275 <res 00000004>      <1> DSK_STATE:	resb 	4
    54 00014279 <res 00000002>      <1> DSK_TRK:	resb 	2
    55                              <1> 
    56                              <1> ;----------------------------------------
    57                              <1> ;	FIXED DISK DATA AREAS		:
    58                              <1> ;----------------------------------------
    59                              <1> 
    60 0001427B <res 00000001>      <1> DISK_STATUS1:	resb 	1		; FIXED DISK STATUS
    61 0001427C <res 00000001>      <1> HF_NUM:		resb 	1		; COUNT OF FIXED DISK DRIVES
    62 0001427D <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 0001427E <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 00014280 <res 00000004>      <1> HDPM_TBL_VEC:	resd	1 		; Primary master disk param. tbl. pointer
    73 00014284 <res 00000004>      <1> HDPS_TBL_VEC:	resd	1		; Primary slave disk param. tbl. pointer
    74 00014288 <res 00000004>      <1> HDSM_TBL_VEC:	resd	1 		; Secondary master disk param. tbl. pointer
    75 0001428C <res 00000004>      <1> HDSS_TBL_VEC:	resd	1		; Secondary slave disk param. tbl. pointer
    76                              <1> 
    77                              <1> ; 03/01/2015
    78 00014290 <res 00000001>      <1> LBAMode:     	resb	1
    79                              <1> 
    80                              <1> ; *****************************************************************************
  2822                                  
  2823                                  ;;; Real Mode Data (10/07/2015 - BSS)
  2824                                  
  2825                                  ;alignb 2
  2826                                  
  2827                                  ; 10/01/2016
  2828                                  %include 'trdoskx.s'	; UNINITIALIZED KERNEL (Logical Drive & FS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - UNINITIALIZED DATA : trdoskx.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 21/04/2017
     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 00014291 <res 00000003>      <1> alignb 4
    20                              <1> 
    21                              <1> ; MAINPROG.ASM
    22 00014294 <res 00000004>      <1> MainProgCfg_FileSize:   resd 1 ; 14/04/2016
    23 00014298 <res 00000004>      <1> MainProgCfg_LineOffset: resd 1 ; 14/04/2016
    24                              <1> 
    25 0001429C <res 00000004>      <1> Current_VolSerial: resd 1
    26                              <1> 
    27 000142A0 <res 00000004>      <1> Current_Dir_FCluster: resd 1
    28                              <1> 
    29 000142A4 <res 00000001>      <1> Current_Dir_Level: resb 1
    30 000142A5 <res 00000001>      <1> Current_FATType: resb 1
    31 000142A6 <res 00000001>      <1> Current_Drv: resb 1
    32 000142A7 <res 00000001>      <1> Current_Dir_Drv:   resb 1 ; '?'
    33 000142A8 <res 00000001>      <1>                    resb 1 ; ':'
    34 000142A9 <res 00000001>      <1> Current_Dir_Root:  resb 1 ; '/' 
    35 000142AA <res 0000005A>      <1> Current_Directory: resb 90
    36 00014304 <res 00000001>      <1> End_Of_Current_Dir_Str: resb 1
    37 00014305 <res 00000001>      <1> Current_Dir_StrLen: resb 1   
    38                              <1> 
    39 00014306 <res 00000001>      <1> CursorColumn: 	resb 1
    40 00014307 <res 00000001>      <1> CmdArgStart:    resb 1
    41                              <1> 
    42                              <1> ; 03/02/2016
    43 00014308 <res 0000004E>      <1> Remark:		resb 78
    44                              <1> 
    45 00014356 <res 00000050>      <1> CommandBuffer: 	resb 80
    46                              <1> 
    47 000143A6 <res 00000100>      <1> TextBuffer:	resb 256
    48                              <1> 
    49                              <1> MasterBootBuff:
    50 000144A6 <res 000001BE>      <1> MasterBootCode: resb 1BEh
    51 00014664 <res 00000040>      <1> PartitionTable: resb 64
    52 000146A4 <res 00000002>      <1> MBIDCode: resw 1
    53                              <1> 
    54                              <1> PTable_Buffer:
    55 000146A6 <res 00000040>      <1> PTable_hd0: resb 64
    56 000146E6 <res 00000040>      <1> PTable_hd1: resb 64
    57 00014726 <res 00000040>      <1> PTable_hd2: resb 64
    58 00014766 <res 00000040>      <1> PTable_hd3: resb 64
    59 000147A6 <res 00000040>      <1> PTable_ep0: resb 64
    60 000147E6 <res 00000040>      <1> PTable_ep1: resb 64
    61 00014826 <res 00000040>      <1> PTable_ep2: resb 64
    62 00014866 <res 00000040>      <1> PTable_ep3: resb 64
    63                              <1> 
    64 000148A6 <res 00000001>      <1> scount:	resb 1 ; 16/05/2016 (diskio.s, 'int33h:')	
    65 000148A7 <res 00000001>      <1> HD_LBA_yes: resb 1
    66 000148A8 <res 00000001>      <1> PP_Counter: resb 1
    67 000148A9 <res 00000001>      <1> EP_Counter: resb 1
    68                              <1> 
    69 000148AA <res 00000004>      <1> EP_StartSector: resd 1
    70 000148AE <res 00000004>      <1>                 resd 1
    71 000148B2 <res 00000004>      <1>                 resd 1
    72 000148B6 <res 00000004>      <1>                 resd 1
    73                              <1> 
    74 000148BA <res 00000200>      <1> DOSBootSectorBuff: resb 512
    75                              <1> 
    76                              <1> FAT_BuffDescriptor:
    77 00014ABA <res 00000004>      <1> FAT_CurrentCluster: resd 1
    78 00014ABE <res 00000001>      <1> FAT_BuffValidData: resb 1
    79 00014ABF <res 00000001>      <1> FAT_BuffDrvName: resb 1
    80 00014AC0 <res 00000002>      <1> FAT_BuffOffset: resw 1
    81 00014AC2 <res 00000004>      <1> FAT_BuffSector: resd 1
    82                              <1> 
    83 00014AC6 <res 00000004>      <1> FAT_ClusterCounter: resd 1
    84 00014ACA <res 00000004>      <1> LastCluster: resd 1
    85                              <1> 
    86                              <1> ; 16/05/2016
    87                              <1> ;; 18/03/2016 (TRDOS v2.0)
    88                              <1> ;ClusterBuffer_Valid: resb 1
    89                              <1> 
    90                              <1> Dir_BuffDescriptor:
    91 00014ACE <res 00000001>      <1> DirBuff_DRV: resb 1
    92 00014ACF <res 00000001>      <1> DirBuff_FATType: resb 1
    93 00014AD0 <res 00000001>      <1> DirBuff_ValidData: resb 1
    94 00014AD1 <res 00000002>      <1> DirBuff_CurrentEntry: resw 1
    95 00014AD3 <res 00000002>      <1> DirBuff_LastEntry: resw 1
    96 00014AD5 <res 00000004>      <1> DirBuff_Cluster: resd 1 
    97 00014AD9 <res 00000002>      <1> DirBuffer_Size: resw 1
    98                              <1> ;DirBuff_EntryCounter: resw 1
    99                              <1> 
   100                              <1> ; 01/02/2016
   101                              <1> ; these are on (real mode) segment 8000h and later
   102                              <1> ; FAT_Buffer:	resb 1536 ; 3 sectors
   103                              <1> ; Dir_Buffer:	resb 512*32
   104                              <1> ; Logical_DOSDisks:  resb 6656 ; 26 * 256 bytes
   105                              <1> 
   106                              <1> ; 18/01/2016
   107                              <1> 
   108 00014ADB <res 00000004>      <1> FreeClusterCount: resd 1
   109                              <1> 
   110 00014ADF <res 00000004>      <1> VolSize_Unit1:   resd 1
   111 00014AE3 <res 00000004>      <1> VolSize_Unit2:   resd 1
   112                              <1> 
   113 00014AE7 <res 00000004>      <1> Vol_Tot_Sec_Str_Start:	    resd 1
   114 00014AEB <res 0000000A>      <1> Vol_Tot_Sec_Str: 	    resb 10
   115 00014AF5 <res 00000001>      <1> Vol_Tot_Sec_Str_End:	    resb 1
   116 00014AF6 <res 00000001>      <1> resb 1
   117 00014AF7 <res 00000004>      <1> Vol_Free_Sectors_Str_Start: resd 1
   118 00014AFB <res 0000000A>      <1> Vol_Free_Sectors_Str:	    resb 10				
   119 00014B05 <res 00000001>      <1> Vol_Free_Sectors_Str_End:   resb 1
   120                              <1> 
   121                              <1> ; 10/02/2016
   122 00014B06 <res 00000001>      <1> RUN_CDRV: resb 1 ; CMD_INTR.ASM  ; 09/11/2011
   123                              <1> 
   124                              <1> ; 24/01/2016
   125 00014B07 <res 00000080>      <1> PATH_Array:     resb 128 ; DIR.ASM ; 09/10/2011
   126                              <1> ; 06/02/2016
   127 00014B87 <res 00000004>      <1> CCD_DriveDT:	resd 1 ; DIR.ASM ; (word)
   128 00014B8B <res 00000001>      <1> CCD_Level:	resb 1 ; DIR.ASM
   129 00014B8C <res 00000001>      <1> Last_Dir_Level:	resb 1 ; DIR.ASM
   130                              <1> ;
   131 00014B8D <res 00000002>      <1> CDLF_AttributesMask: resw 1 ; DIR.ASM
   132 00014B8F <res 00000004>      <1> CDLF_FNAddress:	resd 1 ; DIR.ASM (word)
   133 00014B93 <res 00000002>      <1> CDLF_DEType:	resw 1 ; DIR.ASM
   134                              <1> ;
   135 00014B95 <res 00000001>      <1> CD_COMMAND:	resb 1 ; DIR.ASM
   136                              <1> 
   137 00014B96 <res 00000002>      <1> alignb 4
   138                              <1> 
   139                              <1> ; 29/01/2016
   140 00014B98 <res 00000001>      <1> Program_Exit:	resb 1 ; CMD_INTR.ASM  ; 09/11/2011
   141                              <1> 
   142                              <1> ;alignb 4
   143                              <1> ; 23/02/2016
   144 00014B99 <res 00000001>      <1> disk_rw_op:	resb 1 ;  0 = disk read, 1 = disk write
   145                              <1> ;disk_rw_spt:	resb 1 ; sectors per track (<= 63) /// (<256)
   146                              <1> ; 31/01/2016
   147 00014B9A <res 00000001>      <1> retry_count: 	resb 1 ; DISK_IO.ASM ; 20/07/2011 (CHS_RetryCount)
   148 00014B9B <res 00000001>      <1> disk_rw_err: 	resb 1 ; DISK_IO.ASM ; (Disk_IO_err_code)
   149 00014B9C <res 00000004>      <1> sector_count:	resd 1 ; DISK_IO.ASM ; (Disk_RW_SectorCount)
   150                              <1> 
   151                              <1> ; 06/02/2016 (long name)
   152 00014BA0 <res 00000002>      <1> FDE_AttrMask:	   resw 1 ; DIR.ASM
   153 00014BA2 <res 00000002>      <1> AmbiguousFileName: resw 1 ; DIR.ASM
   154 00014BA4 <res 00000001>      <1> PreviousAttr:	   resb 1 ; DIR.ASM
   155                              <1> ;	
   156 00014BA5 <res 00000001>      <1> LongNameFound:   resb 1	  ; DIR.ASM
   157 00014BA6 <res 00000001>      <1> LFN_EntryLength: resb 1   ; DIR.ASM
   158 00014BA7 <res 00000001>      <1> LFN_CheckSum:    resb 1   ; DIR.ASM
   159 00014BA8 <res 00000084>      <1> LongFileName:    resb 132 ; DIR.ASM
   160                              <1> 
   161                              <1> ;PATH_Array_Ptr: resw 1 ; DIR.ASM
   162 00014C2C <res 00000001>      <1> PATH_CDLevel:	 resb 1 ; DIR.ASM
   163 00014C2D <res 00000001>      <1> PATH_Level:	 resb 1 ; DIR.ASM
   164                              <1> 
   165                              <1> ; 07/02/2016
   166 00014C2E <res 0000000D>      <1> Dir_File_Name:	resb 13 ; DIR.ASM ; 09/10/2011
   167                              <1> 
   168                              <1> ; 10/02/2016
   169 00014C3B <res 0000000D>      <1> Dir_Entry_Name:	resb 13 ; DIR.ASM
   170                              <1> 
   171                              <1> alignb 2
   172                              <1> 
   173 00014C48 <res 00000002>      <1> AttributesMask: resw 1 ; CMD_INTR.ASM ; 09/11/2011
   174                              <1> 
   175                              <1> ; 10/02/2016 (128 bytes -> 126 bytes)
   176                              <1> ; 08/02/2016
   177                              <1> ;FFF Structure (128 bytes) ; DIR.ASM ; 09/10/2011
   178 00014C4A <res 00000001>      <1> FindFile_Drv:		  resb 1
   179 00014C4B <res 00000041>      <1> FindFile_Directory:	  resb 65
   180 00014C8C <res 0000000D>      <1> FindFile_Name:		  resb 13
   181                              <1> FindFile_LongNameEntryLength:
   182 00014C99 <res 00000001>      <1> FindFile_LongNameYes: 	  resb 1 ; Sign for longname procedures
   183                              <1> ;Above 80 bytes form
   184                              <1> ;TR-DOS Source/Destination File FullName Format/Structure
   185 00014C9A <res 00000002>      <1> FindFile_AttributesMask:  resw 1
   186 00014C9C <res 00000020>      <1> FindFile_DirEntry:	  resb 32
   187 00014CBC <res 00000004>      <1> FindFile_DirFirstCluster: resd 1
   188 00014CC0 <res 00000004>      <1> FindFile_DirCluster:	  resd 1
   189 00014CC4 <res 00000002>      <1> FindFile_DirEntryNumber:  resw 1
   190 00014CC6 <res 00000002>      <1> FindFile_MatchCounter:	  resw 1
   191 00014CC8 <res 00000002>      <1> FindFile_Reserved:	  resw 1 ; 06/03/2016
   192                              <1> 
   193 00014CCA <res 00000004>      <1> First_Path_Pos: resd 1	; DIR.ASM ; 09/10/2011
   194 00014CCE <res 00000004>      <1> Last_Slash_Pos: resd 1	; DIR.ASM 
   195                              <1> 
   196                              <1> ; 10/02/2016
   197 00014CD2 <res 00000002>      <1> File_Count:     resw 1 	; DIR.ASM ; 09/10/2011
   198 00014CD4 <res 00000002>      <1> Dir_Count:      resw 1
   199 00014CD6 <res 00000004>      <1> Total_FSize:    resd 1
   200 00014CDA <res 00000004>      <1> TFS_Dec_Begin:  resd 1
   201 00014CDE <res 0000000A>      <1>                 resb 10
   202 00014CE8 <res 00000001>      <1> TFS_Dec_End:    resb 1
   203                              <1> 
   204 00014CE9 <res 00000001>      <1> PrintDir_RowCounter: resb 1
   205                              <1> 
   206 00014CEA <res 00000002>      <1> alignb 4
   207                              <1> ; 15/02/2015 ('show' command variables)
   208 00014CEC <res 00000004>      <1> Show_FDT:	resd 1
   209 00014CF0 <res 00000004>      <1> Show_LDDDT:	resd 1
   210 00014CF4 <res 00000004>      <1> Show_Cluster:	resd 1
   211 00014CF8 <res 00000004>      <1> Show_FileSize:	resd 1
   212 00014CFC <res 00000004>      <1> Show_FilePointer: resd 1
   213 00014D00 <res 00000002>      <1> Show_ClusterPointer: resw 1
   214 00014D02 <res 00000002>      <1> Show_ClusterSize: resw 1
   215 00014D04 <res 00000001>      <1> Show_RowCount:	resb 1
   216                              <1> 
   217 00014D05 <res 00000003>      <1> alignb 4
   218                              <1> ; 21/02/2016
   219 00014D08 <res 00000004>      <1> DelFile_FNPointer:	resd 1 ; ; CMD_INTR.ASM (word) ; 09/11/2011
   220                              <1> ; 27/02/2016
   221                              <1> ; DIR.ASM (09/10/2011)
   222 00014D0C <res 00000004>      <1> DelFile_FCluster:	resd 1
   223 00014D10 <res 00000002>      <1> DelFile_EntryCounter:	resw 1
   224 00014D12 <res 00000001>      <1> DelFile_LNEL:		resb 1
   225 00014D13 <res 00000001>      <1> resb 1
   226                              <1> 
   227                              <1> ; DIR.ASM
   228 00014D14 <res 00000004>      <1> mkdir_DirName_Offset: 	resd 1
   229 00014D18 <res 00000004>      <1> mkdir_FFCluster:	resd 1
   230 00014D1C <res 00000004>      <1> mkdir_LastDirCluster:	resd 1
   231 00014D20 <res 00000004>      <1> mkdir_FreeSectors:	resd 1
   232 00014D24 <res 00000002>      <1> mkdir_attrib:		resw 1 
   233 00014D26 <res 00000001>      <1> mkdir_SecPerClust:	resb 1
   234 00014D27 <res 00000001>      <1> mkdir_add_new_cluster:	resb 1
   235 00014D28 <res 0000000D>      <1> mkdir_Name:		resb 13
   236 00014D35 <res 00000002>      <1> resw 1 ; 01/03/2016
   237                              <1> ; 27/02/2016
   238 00014D37 <res 00000001>      <1> RmDir_MultiClusters:	resb 1  
   239 00014D38 <res 00000004>      <1> RmDir_DirEntryOffset:	resd 1 ; 01/03/2016 (word -> dword)
   240 00014D3C <res 00000004>      <1> RmDir_ParentDirCluster: resd 1
   241 00014D40 <res 00000004>      <1> RmDir_DirLastCluster:   resd 1
   242 00014D44 <res 00000004>      <1> RmDir_PreviousCluster:  resd 1
   243                              <1> ; 22/02/2016
   244 00014D48 <res 00000001>      <1> UPDLMDT_CDirLevel:	resb 1
   245 00014D49 <res 00000004>      <1> UPDLMDT_CDirFCluster:	resd 1
   246                              <1> 	
   247 00014D4D <res 00000003>      <1> alignb 4
   248                              <1> ; DRV_FAT.ASM ; 21/08/2011
   249 00014D50 <res 00000004>      <1> gffc_next_free_cluster:  resd 1
   250 00014D54 <res 00000004>      <1> gffc_first_free_cluster: resd 1
   251 00014D58 <res 00000004>      <1> gffc_last_free_cluster:  resd 1
   252                              <1> 
   253                              <1> ;29/04/2016
   254                              <1> Cluster_Index: ; resd 1
   255                              <1> ; 22/02/2016
   256 00014D5C <res 00000004>      <1> ClusterValue:	resd 1
   257                              <1> ; 04/03/2016
   258 00014D60 <res 00000001>      <1> Attributes:	resb 1 
   259                              <1> ;;CFS_error:  resb 1 ;; 01/03/2016
   260 00014D61 <res 00000001>      <1> resb 1
   261 00014D62 <res 00000001>      <1> CFS_OPType: resb 1
   262 00014D63 <res 00000001>      <1> CFS_Drv:    resb 1
   263 00014D64 <res 00000004>      <1> CFS_CC:	    resd 1
   264 00014D68 <res 00000004>      <1> CFS_FAT32FSINFOSEC: resd 1
   265 00014D6C <res 00000004>      <1> CFS_FAT32FC: resd 1
   266                              <1> 
   267                              <1> ; 27/02/2016
   268                              <1> ;alignb 4
   269 00014D70 <res 00000004>      <1> glc_prevcluster: resd 1 ; DRV_FAT.ASM (21/08/2011)
   270                              <1> ; 22/10/2016
   271 00014D74 <res 00000004>      <1> glc_index:	 resd 1 ;  Last Cluster Index (22/10/2016)	
   272                              <1> 
   273                              <1> ; DIR.ASM
   274 00014D78 <res 00000002>      <1> DLN_EntryNumber: resw 1
   275 00014D7A <res 00000001>      <1> DLN_40h:	 resb 1
   276                              <1> ; 28/02/2016
   277 00014D7B <res 00000001>      <1> TCC_FATErr:	 resb 1 ; DRV_FAT.ASM
   278                              <1> 
   279                              <1> alignb 4
   280                              <1> ; DIR.ASM (09/10/2011)
   281 00014D7C <res 00000002>      <1> LCDE_EntryIndex: resw 1 ; LCDE_EntryOffset
   282 00014D7E <res 00000002>      <1> LCDE_ClusterSN:  resw 1
   283 00014D80 <res 00000004>      <1> LCDE_Cluster: 	 resd 1
   284 00014D84 <res 00000004>      <1> LCDE_ByteOffset: resd 1
   285                              <1> 
   286                              <1> ;alignb4
   287                              <1> ; 06/03/2016 (word -> dword)
   288                              <1> ; CMD_INTR.ASM (01/08/2010)
   289 00014D88 <res 00000004>      <1> SourceFilePath:	     resd 1
   290 00014D8C <res 00000004>      <1> DestinationFilePath: resd 1
   291                              <1> 
   292                              <1> ;alignb 4
   293                              <1> ; 06/03/2016
   294                              <1> ; FILE.ASM (09/10/2011)
   295                              <1> ;Source File Structure (same with 'Find File' Structure)
   296 00014D90 <res 00000001>      <1> SourceFile_Drv:			resb 1
   297 00014D91 <res 00000041>      <1> SourceFile_Directory:		resb 65
   298 00014DD2 <res 0000000D>      <1> SourceFile_Name:		resb 13
   299                              <1> SourceFile_LongNameEntryLength: 
   300 00014DDF <res 00000001>      <1> SourceFile_LongNameYes:		resb 1 ; Sign for longname procedures
   301                              <1> ;Above 80 bytes
   302                              <1> ;is TR-DOS Source File FullName Format/Structure
   303 00014DE0 <res 00000002>      <1> SourceFile_AttributesMask:	resw 1
   304 00014DE2 <res 00000020>      <1> SourceFile_DirEntry:		resb 32
   305 00014E02 <res 00000004>      <1> SourceFile_DirFirstCluster:	resd 1
   306 00014E06 <res 00000004>      <1> SourceFile_DirCluster:		resd 1
   307 00014E0A <res 00000002>      <1> SourceFile_DirEntryNumber:	resw 1
   308 00014E0C <res 00000002>      <1> SourceFile_MatchCounter:	resw 1
   309                              <1> ; 16/03/2016
   310 00014E0E <res 00000001>      <1> SourceFile_SecPerClust:		resb 1
   311 00014E0F <res 00000001>      <1> SourceFile_Reserved:		resb 1
   312                              <1> ; Above is 128 bytes
   313                              <1> 
   314                              <1> ;Destination File Structure (same with 'Find File' Structure)
   315 00014E10 <res 00000001>      <1> DestinationFile_Drv:		resb 1
   316 00014E11 <res 00000041>      <1> DestinationFile_Directory: 	resb 65
   317 00014E52 <res 0000000D>      <1> DestinationFile_Name:		resb 13
   318                              <1> DestinationFile_LongNameEntryLength:
   319 00014E5F <res 00000001>      <1> DestinationFile_LongNameYes:	resb 1 ; Sign for longname procedures
   320                              <1> ;Above 80 bytes
   321                              <1> ;is TR-DOS Destination File FullName Format/Structure
   322 00014E60 <res 00000002>      <1> DestinationFile_AttributesMask: resw 1
   323 00014E62 <res 00000020>      <1> DestinationFile_DirEntry:	resb 32
   324 00014E82 <res 00000004>      <1> DestinationFile_DirFirstCluster: resd 1
   325 00014E86 <res 00000004>      <1> DestinationFile_DirCluster:	resd 1
   326 00014E8A <res 00000002>      <1> DestinationFile_DirEntryNumber: resw 1
   327 00014E8C <res 00000002>      <1> DestinationFile_MatchCounter:	resw 1
   328                              <1> ; 16/03/2016
   329 00014E8E <res 00000001>      <1> DestinationFile_SecPerClust:	resb 1
   330 00014E8F <res 00000001>      <1> DestinationFile_Reserved:	resb 1
   331                              <1> ; Above is 128 bytes
   332                              <1> 
   333                              <1> ; 24/04/2016
   334 00014E90 <res 00000002>      <1> resw 1
   335                              <1> 
   336                              <1> ; 10/03/2016
   337                              <1> ; FILE.ASM
   338 00014E92 <res 00000001>      <1> move_cmd_phase:	   resb 1
   339 00014E93 <res 00000001>      <1> msftdf_sf_df_drv:  resb 1
   340 00014E94 <res 00000004>      <1> msftdf_drv_offset: resd 1
   341                              <1> 
   342                              <1> ; 11/03/2016
   343                              <1> ; DRV_FAT.ASM (21/08/2011)
   344 00014E98 <res 00000004>      <1> FAT_anc_LCluster:  resd 1
   345 00014E9C <res 00000004>      <1> FAT_anc_FFCluster: resd 1
   346                              <1> 
   347                              <1> ;alignb 4
   348                              <1> 
   349                              <1> ; 14/03/2016
   350                              <1> ; TRDOS 386 = TRDOS v2.0 feature only !
   351                              <1> ; 'allocate_memory_block' in 'memory.s'
   352 00014EA0 <res 00000004>      <1> mem_ipg_count:	resd 1 ; page count (for contiguous allocation)
   353 00014EA4 <res 00000004>      <1> mem_pg_count:	resd 1 ; page count (for count down)
   354 00014EA8 <res 00000004>      <1> mem_aperture:	resd 1 ; contiguous free pages (current)
   355 00014EAC <res 00000004>      <1> mem_max_aperture: resd 1 ; maximum value of contiguous free pages
   356 00014EB0 <res 00000004>      <1> mem_pg_pos:	resd 1 ; mem. position (page #) of current aperture
   357 00014EB4 <res 00000004>      <1> mem_max_pg_pos: resd 1 ; mem. position (page #) of max. aperture
   358                              <1> 
   359                              <1> ; 15/03/2016
   360                              <1> ; FILE.ASM ('copy_source_file_to_destination_file')
   361 00014EB8 <res 00000001>      <1> copy_cmd_phase:       resb 1
   362 00014EB9 <res 00000001>      <1> csftdf_rw_err:	      resb 1
   363 00014EBA <res 00000001>      <1> DestinationFileFound: resb 1
   364 00014EBB <res 00000001>      <1> csftdf_cdrv: 	      resb 1
   365 00014EBC <res 00000004>      <1> csftdf_filesize:      resd 1
   366                              <1> ; TRDOS386 (TRDOS v2.0)
   367 00014EC0 <res 00000004>      <1> csftdf_sf_mem_addr:   resd 1
   368 00014EC4 <res 00000004>      <1> csftdf_sf_mem_bsize:  resd 1
   369                              <1> ;
   370                              <1> 
   371 00014EC8 <res 00000004>      <1> csftdf_sf_cluster:    resd 1 ; 16/03/2016
   372 00014ECC <res 00000004>      <1> csftdf_df_cluster:    resd 1
   373                              <1> ; 16/03/2016
   374 00014ED0 <res 00000004>      <1> csftdf_r_size:        resd 1
   375 00014ED4 <res 00000004>      <1> csftdf_w_size:        resd 1
   376 00014ED8 <res 00000004>      <1> csftdf_sf_rbytes:     resd 1
   377 00014EDC <res 00000004>      <1> csftdf_df_wbytes:     resd 1
   378 00014EE0 <res 00000001>      <1> csftdf_percentage:    resb 1
   379                              <1> ; 17/03/2016
   380 00014EE1 <res 00000001>      <1> csftdf_videopage:     resb 1
   381 00014EE2 <res 00000002>      <1> csftdf_cursorpos:     resw 1
   382 00014EE4 <res 00000004>      <1> csftdf_sf_drv_dt:     resd 1
   383 00014EE8 <res 00000004>      <1> csftdf_df_drv_dt:     resd 1
   384                              <1> 
   385                              <1> ; 21/03/2016
   386                              <1> ; 20/03/2016
   387                              <1> ; FILE.ASM
   388 00014EEC <res 00000004>      <1> createfile_Name_Offset:  resd 1
   389 00014EF0 <res 00000004>      <1> createfile_FreeSectors:  resd 1 
   390 00014EF4 <res 00000004>      <1> createfile_size:         resd 1
   391 00014EF8 <res 00000004>      <1> createfile_FFCluster:    resd 1 ; 11/03/2016
   392 00014EFC <res 00000004>      <1> createfile_LastDirCluster: resd 1
   393 00014F00 <res 00000004>      <1> createfile_Cluster:      resd 1
   394 00014F04 <res 00000004>      <1> createfile_PCluster:     resd 1
   395 00014F08 <res 00000001>      <1> createfile_attrib:	 resb 1
   396 00014F09 <res 00000001>      <1> createfile_SecPerClust:  resb 1
   397 00014F0A <res 00000002>      <1> createfile_DirIndex:     resw 1
   398 00014F0C <res 00000004>      <1> createfile_CCount:	 resd 1
   399 00014F10 <res 00000002>      <1> createfile_BytesPerSec:	 resw 1 ; 23/03/2016
   400 00014F12 <res 00000001>      <1> createfile_wfc:	         resb 1
   401 00014F13 <res 00000001>      <1> createfile_UpdatePDir:	 resb 1 ; 31/03/2016
   402                              <1> 
   403                              <1> ;alignb 4
   404                              <1> 
   405                              <1> ; 11/04/2016
   406 00014F14 <res 00000002>      <1> env_var_length:	   resw 1
   407                              <1> 
   408 00014F16 <res 00000002>      <1> alignb 4
   409                              <1> 
   410                              <1> ; 25/04/2016
   411 00014F18 <res 00000001>      <1> readi.valid:	resb 1 ; valid data (>0 = valid for readi)
   412 00014F19 <res 00000001>      <1> readi.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   413 00014F1A <res 00000001>      <1> readi.spc:	resb 1 ; sectors per cluster for 'readi' drive
   414 00014F1B <res 00000001>      <1> readi.s_index:  resb 1 ; sector index in current cluster (buffer)
   415 00014F1C <res 00000004>      <1> readi.sector:	resd 1 ; current disk sector
   416 00014F20 <res 00000002>      <1> readi.bpc:	resw 1 ; bytes per cluster - 1
   417 00014F22 <res 00000002>      <1> readi.offset:	resw 1 ; byte offset in cluster buffer
   418 00014F24 <res 00000004>      <1> readi.cluster:  resd 1 ; current cluster number
   419 00014F28 <res 00000004>      <1> readi.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   420 00014F2C <res 00000004>      <1> readi.fclust:	resd 1 ; first cluster of the current cluster
   421 00014F30 <res 00000004>      <1> readi.fs_index: resd 1 ; sector index in disk/file section (for Singlix FS)
   422                              <1> ;readi.buffer:	resd 1 ; readi sector buffer address
   423                              <1> 
   424                              <1> ;alignb 4
   425                              <1> 
   426 00014F34 <res 00000001>      <1> writei.valid:	resb 1 ; valid data (>0 = valid for writei)
   427 00014F35 <res 00000001>      <1> writei.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   428 00014F36 <res 00000001>      <1> writei.spc:	resb 1 ; sectors per cluster for 'writei' drive
   429 00014F37 <res 00000001>      <1> writei.s_index: resb 1 ; sector index in current cluster (buffer)
   430 00014F38 <res 00000004>      <1> writei.sector:	resd 1 ; current disk sector
   431 00014F3C <res 00000002>      <1> writei.bpc:	resw 1 ; bytes per cluster - 1
   432 00014F3E <res 00000002>      <1> writei.offset:	resw 1 ; byte offset in cluster buffer
   433 00014F40 <res 00000004>      <1> writei.cluster: resd 1 ; current cluster number
   434 00014F44 <res 00000004>      <1> writei.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   435 00014F48 <res 00000004>      <1> writei.fclust:  resd 1 ; first cluster of the current cluster
   436 00014F4C <res 00000004>      <1> writei.fs_index: resd 1 ; sector index in disk/file section (for Singlix FS)
   437                              <1> ;writei.buffer:	resd 1 ; writei sector buffer address
   438 00014F50 <res 00000004>      <1> writei.lclust:	resd 1 ; writei last cluster (mget_w) ; 23/10/2016
   439 00014F54 <res 00000004>      <1> writei.l_index:	resd 1 ; writei last cluster index (mget_w) ; 23/10/2016
   440 00014F58 <res 00000001>      <1> writei.ofn:	resb 1 ; open file number (to be written) ; 23/10/2016
   441                              <1> 
   442 00014F59 <res 00000003>      <1> alignb 4
   443                              <1> 
   444                              <1> ; 29/04/2016
   445 00014F5C <res 00000004>      <1> Run_CDirFC:	resd 1
   446 00014F60 <res 00000001>      <1> Run_Auto_Path:	resb 1
   447 00014F61 <res 00000001>      <1> Run_Manual_Path: resb 1 ; 0 -> auto path sequence needed
   448 00014F62 <res 00000001>      <1> EXE_ID:		resb 1	
   449 00014F63 <res 00000001>      <1> EXE_dot:	resb 1
   450                              <1> 
   451                              <1> ; 06/05/2016
   452 00014F64 <res 00000004>      <1> mainprog_return_addr: resd 1
   453 00014F68 <res 00000004>      <1> last_error:	resd 1  ; this will be used to return error code to MainProg
   454                              <1> 			; 'lasterror' keyword will be used later to get the
   455                              <1> 			; last error code/number/status.
   456                              <1> ; 12/05/2016
   457 00014F6C <res 00000004>      <1> video_eax:	resd 1  ; eax return value of video function
   458                              <1> 
   459                              <1> ; 01/06/2016
   460 00014F70 <res 00000004>      <1> user_buffer:	resd 1  ; 'diskio.s' (INT 33h, Function 08h, floppy disk type)
   461                              <1> 
   462                              <1> ; 21/05/2016 - TRDOS 386 ('swap/switch', 'rswap', [u.pri])
   463 00014F74 <res 00000001>      <1> priority:	resb 1  ; running priority level of process (0,1,2)
   464                              <1> 			; (run queue which is process comes from)
   465                              <1> ; 22/05/2016 - TRDOS 386 ('set_run_sequence', 'rtc_int', 'u_timer')
   466 00014F75 <res 00000001>      <1> p_change:	resb 1  ; process change status (for timer events)
   467                              <1> ; 23/05/2016 - TRDOS 386 ('clock')
   468 00014F76 <res 00000001>      <1> multi_tasking:	resb 1   ; Multi Tasking status (0 = disabled, >0 = enabled)
   469                              <1> 			; (EBX will return with user buffer addr or disk type)
   470                              <1> ; 07/06/2016
   471 00014F77 <res 00000001>      <1> timer_events:	resb 1  ; number of (active) timer events, <= 16		
   472                              <1> 
   473                              <1> ; 24/06/2016
   474 00014F78 <res 00000001>      <1> w_str_cmd:	resb 1	; WRITE_STRING command (0,1,2,3) ; video.s
   475 00014F79 <res 00000001>      <1> p_crt_mode:	resb 1  ; previous video mode (=3 or 0), backup mark/sign
   476                              <1> ; 26/06/2016
   477 00014F7A <res 00000001>      <1> p_crt_page:	resb 1  ; previous active page (for 'set_mode')
   478                              <1> ; 04/07/2016
   479 00014F7B <res 00000001>      <1> noclearmem:	resb 1  ; if set, 'SET MODE' (INT 31h) function (AH = 4)
   480                              <1> 			; will not clear the video memory
   481                              <1> 			; (usable for graphics modes only)
   482                              <1> alignb 2
   483 00014F7C <res 00000002>      <1> CRT_LEN:	resw 1  ; length of regen buffer in bytes
   484 00014F7E <res 00000010>      <1> cursor_pposn:	resw 8  ; cursor positions backup
   485                              <1> 
   486                              <1> ; 10/07/2016 ('VGA_FONT_SETUP', INT 43H address for x86 real mode bios)
   487 00014F8E <res 00000004>      <1> VGA_INT43H:	resd 1	; 0 = default (not configured by user)
   488                              <1> 			; 0FFFFFFFFh = user defined fonts
   489                              <1> 			; address:
   490                              <1> 			; 	vgafont8
   491                              <1> 			; 	vgafont16
   492                              <1> 			; 	vgafont14
   493                              <1> 
   494                              <1> ; 25/07/2016
   495 00014F92 <res 00000001>      <1> VGA_MTYPE:	resb 1  ; 0=CTEXT,1=MTEXT,2=CGA,3=PLANAR1,4=PLANAR4,5=LINEAR 
   496                              <1> 
   497                              <1> ; 23/10/2016
   498 00014F93 <res 00000001>      <1> setfmod		resb 1	; update last modification date&time sign (if >0)
   499                              <1> 			; (it is Open File Number + 1, if > 0)
   500                              <1> alignb 4
   501                              <1> 
   502                              <1> ; 16/10/2016
   503 00014F94 <res 00000004>      <1> FFF_UBuffer:	resd 1  ; User's buffer address for FFF & FNF system calls 
   504                              <1> ; 15/10/2016
   505 00014F98 <res 00000001>      <1> FFF_Valid:	resb 1  ; Find First File Structure validation byte
   506                              <1> 			; 0  = invalid (Find Next File can't use FFF struct)
   507                              <1> 			; >0 = valid, return type for FFF and Find Next File
   508                              <1> 			; 24 = basic parameters, 24 bytes
   509                              <1> 			; 128 = entire FFF structure/table, 128 bytes
   510                              <1> ; 16/10/2016 (FFF_Attrib: resw 1)
   511 00014F99 <res 00000001>      <1> FFF_Attrib:	resb 1	; Find First File attributes for Find Next File (LB)
   512 00014F9A <res 00000001>      <1> FFF_RType:	resb 1  ; FFF return type (0 = Basic, >0 = complete) (HB)
   513                              <1> ; 16/10/2016 - 05/10/2016 (Set Working Path)
   514 00014F9B <res 00000001>      <1> SWP_inv_fname:	resb 1	; Set Working Path - Invalid File Name
   515 00014F9C <res 00000002>      <1> SWP_Mode:	resw 1	; Set Working Path - Mode
   516 00014F9E <res 00000001>      <1> SWP_DRV:	resb 1	; Set Working Path - Drive	
   517 00014F9F <res 00000001>      <1> SWP_DRV_chg:	resb 1	; Set Working Path - Drive Change
   518                              <1> 
   519                              <1> ; 27/02/2017
   520 00014FA0 <res 00000001>      <1> fpready:	resb 1	; '80387 fpu is ready' flag	
   521                              <1> 
   522                              <1> ; 08/10/2016
   523 00014FA1 <res 00000009>      <1> device_name:    resb 9  ; capitalized (and zero padded) device canem 
   524                              <1> 			; (example: "TTY0",0,0,0,0,0")
   525                              <1> 
   526 00014FAA <res 00000002>      <1> alignb 4
   527                              <1> 
   528                              <1> ; 08/10/2016
   529                              <1> ; 07/10/2016
   530                              <1> ; Table of kernel devices (which do not use installable device drivers)
   531                              <1> ; has been coded into KERNEL (trdosk9.s) 
   532                              <1> ; 07/10/2016
   533                              <1> ; 8 installable device drivers available to install (NUMIDEV)
   534 00014FAC <res 00000020>      <1> IDEV_PGDIR: resd NUMIDEV
   535                              <1> 			; Page directories of installable device drivers
   536                              <1> 			;
   537                              <1> 			; Note: Virtual start address is always 400000h
   538                              <1> 			; (end of the 1st 4MB). [org 400000h]
   539                              <1> 			; Segments: KCODE, KDATA
   540                              <1> 			; Method: call 400000h (after changing page dir) 	
   541                              <1> 			; Query code located at the start (400000h).
   542                              <1> 			; Query code returns with
   543                              <1> 			;   eax = device type and driver version
   544                              <1> 			;         AL = Device Type minor
   545                              <1> 			;         AH = Device Type major
   546                              <1> 			;         Byte 16-23 : Version minor
   547                              <1> 			;	  Byte 24-31 : Version major - 1
   548                              <1> 			;		       (0:0 -> 1.0)
   549                              <1> 			;   ebx = initialization code address
   550                              <1> 			;   ecx = configuration table address
   551                              <1> 			;   edx = description table address
   552                              <1> 			;   esi = device (default) name address (ASCIIZ)
   553                              <1> 			;	 (name has "/DEV/" prefix)		
   554                              <1> 			;   edi = dispatch table address
   555                              <1> 			;        (for calling kernel-device functions)
   556                              <1> 			;   ebp = address table address
   557                              <1> 			; Initialization code returns with
   558                              <1> 			;   eax = open code address
   559                              <1> 			;   ecx = close code address 
   560                              <1> 			;   ebx = read code address
   561                              <1> 			;   edx = write code address 	
   562                              <1> 			;   esi = IOCTL code address
   563                              <1> 			;   edi = dispatch table address
   564                              <1> 			;   ebp = address table address
   565                              <1> 			; Address Table:
   566                              <1> 			;    Offset 0  : open code address
   567                              <1> 			;    Offset 4  : read code address
   568                              <1> 			;    Offset 8  : write code address
   569                              <1> 			;    Offset 12 : close code address
   570                              <1> 			;    Offset 16 : IOCTL code address
   571                              <1> 			;    Offset 20 : initialization code address
   572                              <1> 			;    Offset 24 : description table address
   573                              <1> 			;    Offset 28 : configuration table address
   574                              <1> 			;    Offset 32 : device name address
   575                              <1> 			;    Offset 36 : dispatch table address
   576                              <1> 			;          (for calling kernel-device functions)
   577                              <1> 
   578 00014FCC <res 00000040>      <1> IDEV_NAME:  resb 8*NUMIDEV 
   579                              <1> 			; 8 byte names of installable device drivers
   580                              <1> 
   581 0001500C <res 00000008>      <1> IDEV_TYPE:  resb NUMIDEV ; Driver type of installable device drivers
   582 00015014 <res 00000008>      <1> IDEV_FLAGS: resb NUMIDEV ; Device access parameters for installable
   583                              <1>                          ; device drivers (These values are set while
   584                              <1> 			 ; the device driver is being loaded.)
   585 0001501C <res 00000020>      <1> IDEV_OADDR: resd NUMIDEV ; open function addr for installable dev driver
   586 0001503C <res 00000020>      <1> IDEV_CADDR: resd NUMIDEV ; close function addr for installable dev driver
   587 0001505C <res 00000020>      <1> IDEV_RADDR: resd NUMIDEV ; read function addr for installable dev driver
   588 0001507C <res 00000020>      <1> IDEV_WADDR: resd NUMIDEV ; write function addr for installable dev driver
   589                              <1> 	
   590                              <1> ; 08/10/2016	
   591                              <1> ; 07/10/2016
   592                              <1> ; Device Open and Access parameters
   593 0001509C <res 0000001E>      <1> DEV_ACCESS:	 resb NUMOFDEVICES   ; bit 0 = accessable by normal users
   594                              <1> 				     ; bit 1 = read access permission
   595                              <1> 				     ; bit 2 = write access permission
   596                              <1> 				     ; bit 3 = IOCTL permission to users
   597                              <1> 				     ; bit 4 = block device if it is set	
   598                              <1> 				     ; bit 5 = 16 bit or 1024 byte data
   599                              <1> 				     ; bit 6 = 32 bit or 2048 byte data
   600                              <1> 				     ; bit 7 = installable device driver
   601 000150BA <res 0000001E>      <1> DEV_R_OWNER:	 resb NUMOFDEVICES   ; Reading owner no (u.uid) of devices		
   602 000150D8 <res 0000001E>      <1> DEV_R_OPENCOUNT: resb NUMOFDEVICES   ; Reading open count 
   603 000150F6 <res 0000001E>      <1> DEV_W_OWNER:	 resb NUMOFDEVICES   ; Writing owner no (u.uid) of devices		
   604 00015114 <res 0000001E>      <1> DEV_W_OPENCOUNT: resb NUMOFDEVICES   ; Writing open count
   605 00015132 <res 0000001E>      <1> DEV_DRIVER:	 resb NUMOFDEVICES   ; device driver number (1 to 7Fh)
   606                              <1> 				     ; *if bit 7 is set (80 to FFh)
   607                              <1> 				     ; *if it is installable device driver
   608                              <1> 				     ; *index (0 to 7Fh)
   609                              <1> 				     ; otherwise it is kernel device index
   610 00015150 <res 0000001E>      <1> DEV_OPENMODE:	 resb NUMOFDEVICES   ; 1 = read mode
   611                              <1> 				     ; 2 = write mode
   612                              <1> 				     ; 3 = read & write 	  
   613                              <1> 				     ; 0 = not open (free)		
   614 0001516E <res 00000078>      <1> DEV_NAME_PTR:    resd NUMOFDEVICES   ; pointers to name addresses of drivers
   615                              <1> 				     ; Address base: KDEV_NAME+		
   616                              <1> 				     ; or IDEV_NAME+
   617 000151E6 <res 00000078>      <1> DEV_R_POINTER:	 resd NUMOFDEVICES   ; reading pointer, writing pointer	
   618 0001525E <res 00000078>      <1> DEV_W_POINTER:	 resd NUMOFDEVICES   ; sector number if block device
   619                              <1> 				     ; character offset if char device
   620 000152D6 <res 00000002>      <1> alignb 4
   621                              <1> 
   622                              <1> ; 06/10/2016
   623                              <1> ; Open File Parameters
   624 000152D8 <res 00000028>      <1> OF_FCLUSTER:	resd OPENFILES  ; First clusters of open files
   625 00015300 <res 0000000A>      <1> OF_DRIVE:	resb OPENFILES  ; Logical DOS drive numbers of open files 
   626 0001530A <res 0000000A>      <1> OF_MODE:	resb OPENFILES  ; Open mode (1 = read, 2 = write, 3 = r&w) 
   627 00015314 <res 0000000A>      <1> OF_STATUS:	resb OPENFILES  ; (bit 0 = read, bit 1 = write)
   628 0001531E <res 0000000A>      <1> OF_OPENCOUNT:	resb OPENFILES  ; Open counts of open files
   629 00015328 <res 00000028>      <1> OF_POINTER:	resd OPENFILES	; File seek/read/write pointer
   630 00015350 <res 00000028>      <1> OF_SIZE:	resd OPENFILES	; File sizes of open files (in bytes)
   631 00015378 <res 00000028>      <1> OF_DIRFCLUSTER:	resd OPENFILES  ; Directory First Clusters of open files
   632 000153A0 <res 00000028>      <1> OF_DIRCLUSTER:	resd OPENFILES  ; Directory (Entry) Clusters of open files
   633 000153C8 <res 00000028>      <1> OF_VOLUMEID:	resd OPENFILES  ; Vol ID for removable drives of open files
   634 000153F0 <res 00000028>      <1> OF_CCLUSTER:	resd OPENFILES  ; Current clusters of open files
   635 00015418 <res 00000028>      <1> OF_CCINDEX:	resd OPENFILES  ; Cluster index numbers of current clusters
   636                              <1> ; 24/10/2016
   637 00015440 <res 00000014>      <1> OF_DIRENTRY:	resw OPENFILES  ; Directory entry index no. in dir cluster 
   638                              <1> 				; Sector index = entry index / 16
   639                              <1> ;alignb 2
   640                              <1> 
   641 00015454 <res 00000060>      <1> DTA:		resd 24		; Find First File data transfer area
   642                              <1> 
   643                              <1> ; 19/12/2016
   644 000154B4 <res 00000001>      <1> tcallback:	resb 1		; Timer callback method flag for 'systimer'
   645 000154B5 <res 00000001>      <1> trtc:		resb 1		; Timer interrupt type flag for 'systimer'
   646                              <1> ; 20/02/2017
   647 000154B6 <res 00000001>      <1> no_page_swap:	resb 1		; Swap lock for Signal Response Byte pages 
   648                              <1> ;;15/01/2017
   649                              <1> ; 02/01/2017
   650                              <1> ;;intflg:	resb 1		; software interrupt in progress signal
   651                              <1> 				; (for timer interrupt)
   652                              <1> 
   653 000154B7 <res 00000001>      <1> alignb 4
   654                              <1> ; 13/04/2017
   655 000154B8 <res 0000001E>      <1> DEV_INTR:	resb NUMOFDEVICES ; Device Interrupt (IRQ) number + 1	
   656                              <1> 				; (0= not available, 1= IRQ 0, 16= IRQ 15)
   657 000154D6 <res 00000040>      <1> DEV_INT_HNDLR:	resd 16		; Device Interrupt Handler addr, if > 0 	
   658                              <1> 
   659                              <1> 
   660                              <1> ;alignb 4
   661                              <1> 
   662                              <1> ; 26/02/2017 ; IRQ Callback parameters ('syscalbac')
   663                              <1> ;Index: ; 0 to 8
   664                              <1> ;	0 = IRQ3, 1 = IRQ4, 2 = IRQ5, 3 = IRQ7
   665                              <1> ;	4 = IRQ9, 5 = IRQ10, 6 = IRQ11, 7 = IRQ12, 8 = IRQ13  
   666 00015516 <res 00000009>      <1> IRQ.owner:	resb 9		; owner, 0 = free, >0 = [u.uno]
   667 0001551F <res 00000009>      <1> IRQ.dev:	resb 9		; 0 = default/kernel, >0 = device number
   668 00015528 <res 00000009>      <1> IRQ.method:	resb 9 		; 0 = Signal Response Byte, 1 = Callback
   669 00015531 <res 00000009>      <1> IRQ.srb:	resb 9 		; Signal Response/Return Byte value
   670 0001553A <res 00000024>      <1> IRQ.addr:	resd 9		; Rignal Response Byte address (physical)
   671                              <1> 				; or Callback service address (virtual)
   672                              <1> ; 28/02/2017
   673 0001555E <res 00000004>      <1> IRQ_cr3:	resd 1		; for saving cr3 register in IRQ handler
   674 00015562 <res 00000001>      <1> IRQnum:		resb 1		; IRQ number for IRQ handler (trdosk8.s)
   675                              <1> 
   676                              <1> 
   677                              <1> ; 10/04/2017
   678                              <1> ; 03/04/2017
   679                              <1> ; UNINITIALIZED AUDIO DATA
   680 00015563 <res 00000001>      <1> alignb 4
   681 00015564 <res 00000001>      <1> audio_pci:	resb 1
   682 00015565 <res 00000001>      <1> audio_device:	resb 1
   683 00015566 <res 00000001>      <1> audio_mode:	resb 1
   684 00015567 <res 00000001>      <1> audio_intr:	resb 1
   685 00015568 <res 00000001>      <1> audio_busy:	resb 1  ; Busy flag for audio irq ; 21/04/2017
   686 00015569 <res 00000001>      <1> audio_reserved: resb 1
   687 0001556A <res 00000002>      <1> audio_io_base:	resw 1 	; Base I/O address of audio device
   688 0001556C <res 00000004>      <1> audio_dev_id:	resd 1	; BUS/DEV/FN ; 00000000BBBBBBBBDDDDDFFF00000000
   689 00015570 <res 00000004>      <1> audio_vendor:	resd 1
   690 00015574 <res 00000004>      <1> audio_stats_cmd: resd 1
   691                              <1> ;
   692 00015578 <res 00000004>      <1> audio_buffer:	resd 1	; virtual address of user's audio buffer
   693                              <1> 			; (buffer size
   694 0001557C <res 00000004>      <1> audio_p_buffer:	resd 1	; Physical address of user's audio buffer
   695 00015580 <res 00000004>      <1> audio_buff_size: resd 1 ; dma buffer size (2*half buffer size) 
   696 00015584 <res 00000004>      <1> audio_dma_buff:	resd 1  ; dma buffer address
   697 00015588 <res 00000004>      <1> audio_dmabuff_size: resd 1 ; dma buffer size (2 * half buffer size)
   698 0001558C <res 00000001>      <1> audio_flag:	resb 1  ; dma buffer flag (1st half = 0, 2nd half = 1)
   699 0001558D <res 00000001>      <1> audio_user:	resb 1	; user number of the owner
   700 0001558E <res 00000001>      <1> audio_cb_mode:	resb 1	; 0 = signal response byte method
   701                              <1> 			; 1 = callback method
   702                              <1> 			; 2 = s.r.b. method with auto increment
   703 0001558F <res 00000001>      <1> audio_srb:	resb 1	; signal response byte value
   704 00015590 <res 00000004>      <1> audio_cb_addr:	resd 1  ; callback service address or s.r.b. address
   705                              <1> 			; (s.r.b. addr is physical, cbs addr is virtual)
   706                              <1> 
   707 00015594 <res 00000001>      <1> audio_bps:	resb 1  ; selected mode: 8 bit, 16 bit
   708 00015595 <res 00000001>      <1> audio_stmo:	resb 1	; selected mode: mono /stereo
   709 00015596 <res 00000002>      <1> audio_freq: 	resw 1	; sampling rate
   710                              <1> 
   711                              <1> 
   712                              <1> ; 21/04/2017
   713 00015598 <res 00000001>      <1> audio_play_cmd: resb 1  ; Play/Stop command (1 = play, 0 = stop)
   714 00015599 <res 00000001>      <1> audio_flag_eol:	resb 1  ; End of Link status (vt8233, EOL/FLAG)
   715                              <1> 
   716                              <1> audio_master_volume:
   717 0001559A <res 00000001>      <1> audio_master_volume_l: resb 1 ; sound volume (lineout) left channel
   718 0001559B <res 00000001>      <1> audio_master_volume_r: resb 1 ; sound volume (lineout) right channel
   719                              <1> 
   720                              <1> alignb 4
   721                              <1> ; 21/04/2017
   722 0001559C <res 00000400>      <1> audio_bdl_buff:	resd 32*8  ; VT8233 (AC97) BDL Buffer Size
  2829                                  ; 24/01/2016
  2830                                  %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 0001599C <res 00000002>      <1> 	i.flgs:	 resw 1
    37 0001599E <res 00000001>      <1> 	i.nlks:	 resb 1
    38 0001599F <res 00000001>      <1> 	i.uid:	 resb 1
    39                              <1>         ;i.size:  resw 1 ; size
    40 000159A0 <res 00000002>      <1> 	resw 1 ; 29/04/2016
    41 000159A2 <res 00000010>      <1> 	i.dskp:	 resw 8 ; 16 bytes
    42 000159B2 <res 00000004>      <1> 	i.ctim:	 resd 1
    43 000159B6 <res 00000004>      <1> 	i.mtim:	 resd 1
    44 000159BA <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 000159BC <res 00000020>      <1>         p.pid:   resw nproc
    58 000159DC <res 00000020>      <1>         p.ppid:  resw nproc
    59 000159FC <res 00000020>      <1>         p.break: resw nproc
    60 00015A1C <res 00000010>      <1>         p.ttyc:  resb nproc ; console tty in Retro UNIX 8086 v1.
    61 00015A2C <res 00000010>      <1> 	p.waitc: resb nproc ; waiting channel in Retro UNIX 8086 v1.
    62 00015A3C <res 00000010>      <1> 	p.link:	 resb nproc
    63 00015A4C <res 00000010>      <1> 	p.stat:	 resb nproc
    64                              <1> 
    65                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 feature only !) 
    66 00015A5C <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 00015A9C <res 00000010>      <1> 	p.timer: resb nproc ; number of timer events of the processs
    71                              <1> 
    72                              <1> 	; 19/12/2016
    73 00015AAC <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 00015AEC <res 000001F4>      <1> fsp:	 resb nfiles * 10 ; 11/05/2015 (8 -> 10)
   107 00015CE0 <res 00000002>      <1> idev:	 resw 1 ; device number is 1 byte in Retro UNIX 8086 v1 !
   108 00015CE2 <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 00015CE4 <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 00015CE5 <res 00000001>      <1> mdev:	 resb 1 ; mounted device number ; Retro UNIX 8086 v1 feature only!
   124                              <1> ; 15/04/2015
   125 00015CE6 <res 00000001>      <1> active:	 resb 1 
   126 00015CE7 <res 00000001>      <1> 	 resb 1 ; 09/06/2015
   127 00015CE8 <res 00000002>      <1> mnti:	 resw 1
   128 00015CEA <res 00000002>      <1> mpid:	 resw 1
   129 00015CEC <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 00015CEE <res 00000002>      <1> runq_event:	 resw 1 ; high priority, 'run for event'            ; 2
   134 00015CF0 <res 00000002>      <1> runq_normal:	 resw 1 ; normal/regular priority, 'run as reqular' ; 1
   135 00015CF2 <res 00000002>      <1> runq_background: resw 1 ; low priority, 'run on background'         ; 0
   136                              <1> ;
   137 00015CF4 <res 00000001>      <1> imod:	 resb 1
   138 00015CF5 <res 00000001>      <1> smod:	 resb 1
   139 00015CF6 <res 00000001>      <1> mmod:	 resb 1
   140 00015CF7 <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 00015CF8 <res 00000004>      <1> 	u.sp:	  resd 1 ; esp (kernel stack at the beginning of 'sysent')
   164 00015CFC <res 00000004>      <1> 	u.usp:	  resd 1 ; esp (kernel stack points to user's registers)
   165 00015D00 <res 00000004>      <1> 	u.r0:	  resd 1 ; eax
   166 00015D04 <res 00000002>      <1> 	u.cdir:	  resw 1
   167 00015D06 <res 0000000A>      <1> 	u.fp:	  resb 10
   168 00015D10 <res 00000004>      <1> 	u.fofp:	  resd 1
   169 00015D14 <res 00000004>      <1> 	u.dirp:	  resd 1
   170 00015D18 <res 00000004>      <1> 	u.namep:  resd 1
   171 00015D1C <res 00000004>      <1> 	u.off:	  resd 1
   172 00015D20 <res 00000004>      <1> 	u.base:	  resd 1
   173 00015D24 <res 00000004>      <1> 	u.count:  resd 1
   174 00015D28 <res 00000004>      <1> 	u.nread:  resd 1
   175 00015D2C <res 00000004>      <1> 	u.break:  resd 1 ; break
   176 00015D30 <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 00015D32 <res 00000001>      <1> 	u.ttyn:	  resb 1 ; 28/07/2013 - Retro Unix 8086 v1 feature only !
   180 00015D33 <res 00000001>      <1> 	u.resb:   resb 1 ; 10/01/2017 (TRDOS 386, temporary)
   181 00015D34 <res 00000010>      <1> 	u.dirbuf: resb 16 ; 04/12/2015 (10 -> 16) 
   182                              <1> 	;u.pri:	  resw 1 ; 14/02/2014
   183 00015D44 <res 00000001>      <1> 	u.quant:  resb 1 ; Retro UNIX 8086 v1 Feature only ! (uquant)
   184 00015D45 <res 00000001>      <1> 	u.pri:	  resb 1 ; Modification: 21/05/2016 (priority levels: 0, 1, 2)
   185 00015D46 <res 00000002>      <1> 	u.intr:	  resw 1
   186 00015D48 <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 00015D4A <res 00000002>      <1> 	u.cdrv:	  resw 1 ; cdev
   190 00015D4C <res 00000001>      <1> 	u.uid:	  resb 1 ; uid
   191 00015D4D <res 00000001>      <1> 	u.ruid:	  resb 1
   192 00015D4E <res 00000001>      <1> 	u.bsys:	  resb 1
   193 00015D4F <res 00000001>      <1> 	u.uno:	  resb 1
   194 00015D50 <res 00000004>      <1>         u.upage:  resd 1 ; 16/04/2015 - Retro Unix 386 v1 feature only !
   195 00015D54 <res 00000004>      <1> 	u.pgdir:  resd 1 ; 09/03/2015 (page dir addr of process)
   196 00015D58 <res 00000004>      <1> 	u.ppgdir: resd 1 ; 06/05/2015 (page dir addr of the parent process)
   197 00015D5C <res 00000004>      <1> 	u.pbase:  resd 1 ; 20/05/2015 (physical base/transfer address)
   198 00015D60 <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 00015D62 <res 00000001>      <1> 	u.kcall:  resb 1 ; The caller is 'namei' (dskr) or 'mkdir' (dskw) sign		
   205 00015D63 <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 00015D64 <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 00015D68 <res 00000004>      <1> 	u.pfcount: resd 1 ; page fault count for (this) process (for sys geterr)
   218                              <1> 		; 19/12/2016 (TRDOS 386)	
   219 00015D6C <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 00015D70 <res 00000001>      <1> 	u.t_lock: resb 1 ; Timer interrupt (callback) lock (unlocked by 'sysrele')
   222 00015D71 <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 00015D72 <res 00000001>      <1> 	u.irqc:	  resb 1  ; Count of IRQ callback services (IRQs in use)
   225                              <1> 		; 28/02/2017 (TRDOS 386) 
   226 00015D73 <res 00000001>      <1> 	u.irqwait: resb 1 ; IRQ waiting for callback service flag (IRQ number, If > 0)
   227 00015D74 <res 00000001>      <1> 	u.r_lock:  resb 1 ; 'IRQ callback service is in progress' flag (IRQ lock)
   228 00015D75 <res 00000001>      <1> 	u.r_mode:  resb 1 ; running mode during hadware interrupt	
   229                              <1> 		; 27/02/2017 (TRDOS 386) 
   230 00015D76 <res 00000001>      <1> 	u.fpsave: resb 1  ; TRDOS 386, 'save/restore FPU registers' flag
   231 00015D77 <res 00000001>      <1> alignb 4
   232 00015D78 <res 0000005E>      <1> 	u.fpregs: resb 94 ; 94 byte area for saving and restoring FPU registers	
   233                              <1> 
   234 00015DD6 <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 00015DD8 <res 00000004>      <1> pcore:  resd 1 ; physical start address of user's memory space (for sys exec)
   240 00015DDC <res 00000004>      <1> ecore:  resd 1 ; physical start address of user's memory space (for sys exec)
   241 00015DE0 <res 00000004>      <1> nbase:	resd 1	; physical base address for 'namei' & 'sysexec'
   242 00015DE4 <res 00000002>      <1> ncount: resw 1	; remain byte count in page for 'namei' & 'sysexec'
   243 00015DE6 <res 00000002>      <1> argc:	resw 1	; argument count for 'sysexec'
   244 00015DE8 <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 00015DEC <res 00000001>      <1> rw: 	 resb 1 ;; Read/Write sign (iget)
   249                              <1> 
   250                              <1> ;alignb 4
   251                              <1> 
   252                              <1> ; 24/04/2016
   253 00015DED <res 00000004>      <1> ii:		resd 1 ; first cluster of the program file
   254 00015DF1 <res 00000004>      <1> i.size:		resd 1 ; size of the program file
  2831                                  
  2832 00015DF5 <res 00000003>          alignb 4
  2833                                  
  2834                                  ; 23/05/2016 (TRDOS 386)
  2835                                  ; 14/10/2015 (Retro UNIX 386 v1, 'unix386.s')
  2836 00015DF8 <res 00000004>          cr3reg:	 resd 1  ; cr3 register content at the beginning of the timer
  2837                                  		 ; (or RTC) interrupt handler.
  2838                                  
  2839                                  ; 10/12/2016 (callback)
  2840                                  ; 10/06/2016
  2841                                  ; 19/05/2016
  2842                                  ; 18/05/2016 - TRDOS 386 feature only !
  2843 00015DFC <res 00000100>          timer_set: resd 16*4   ; 256 bytes memory space for 16 timer events
  2844                                  	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  2845                                  	;       Owner:	        resb 1 ; 0 = free
  2846                                  	;		  	       ;>0 = process number (u.uno)
  2847                                  	;	Callback:	resb 1 ; 0 = response byte address (phy)
  2848                                  	;				 1 = callback address (virtual)				
  2849                                  	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  2850                                  	;		   	       ; 1 = Real Time Clock interrupt 
  2851                                  	;	Response:       resb 1 ; 0 to 255, signal return value
  2852                                  	;	Count Limit:	resd 1 ; count of ticks (total/set)
  2853                                  	;	Current Count: 	resd 1 ; count of ticks (current)
  2854                                  	;	Response Addr:  resd 1 ; response byte (pointer) address
  2855                                  	;			       ; (or callback -user service- address)	
  2856                                  
  2857                                  ;; Memory (swap) Data (11/03/2015)
  2858                                  ; 09/03/2015
  2859 00015EFC <res 00000002>          swpq_count: resw 1 ; count of pages on the swap queue
  2860 00015EFE <res 00000004>          swp_drv:    resd 1 ; logical drive description table address of the swap drive/disk
  2861 00015F02 <res 00000004>          swpd_size:  resd 1 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  2862 00015F06 <res 00000004>          swpd_free:  resd 1 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  2863 00015F0A <res 00000004>          swpd_next:  resd 1 ; next free page block
  2864 00015F0E <res 00000004>          swpd_last:  resd 1 ; last swap page block	
  2865                                  
  2866 00015F12 <res 00000002>          alignb 4
  2867                                  
  2868                                  ; 10/07/2015
  2869                                  ; 28/08/2014
  2870 00015F14 <res 00000004>          error_code:	resd 1
  2871                                  ; 29/08/2014
  2872 00015F18 <res 00000004>          FaultOffset: 	resd 1
  2873                                  ; 21/09/2015
  2874 00015F1C <res 00000004>          PF_Count:	resd 1	; total page fault count
  2875                                  		       	; (for debugging - page fault analyze)
  2876                                  		 	; 'page_fault_handler' (memory.inc)
  2877                                  			; 'sysgeterr' (u9.s)
  2878                                  
  2879                                  ; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
  2880                                  ; 22/08/2015 (Retro UNIX 386 v1)
  2881                                  buffer: 
  2882 00015F20 <res 00000008>          	resb	8 
  2883                                  readi_buffer:
  2884 00015F28 <res 00000200>          	resb 	512
  2885 00016128 <res 00000008>          	resb	8
  2886                                  writei_buffer:
  2887 00016130 <res 00000200>          	resb	512	
  2888                                  ; 24/10/2016
  2889 00016330 <res 00000008>          	resb	8 
  2890                                  rw_buffer:
  2891 00016338 <res 00000800>          	resb 	2048  ; general purposed, r/w sector buffer
  2892                                  
  2893                                  bss_end:
  2894                                  
  2895                                  ; 27/12/2013
  2896                                  _end:  ; end of kernel code
