     1                                  ; ****************************************************************************
     2                                  ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0
     3                                  ; ----------------------------------------------------------------------------
     4                                  ; Last Update: 20/02/2017
     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[12FA]              	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[0EFA]              	mov	[mem_1m_1k], cx
   166 00000017 8916[10FA]              	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[15FA]          <1> 	inc	byte [hdc]	; count of hard disks (EDD present)
    42 0000008A 8816[14FA]          <1>         mov     [last_drv], dl  ; last hard disk number
    43 0000008E BB[98F9]            <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[16FA]            <1> 	mov	si, fd0_type
    61                              <1> L3:
    62                              <1> 	; 14/01/2015
    63 0000009F 8816[13FA]          <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[16FA]          <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[15FA]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[13FA]          <1>         mov     [drv], dl
    94 000000CA 8816[14FA]          <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[15FA]          <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[13FA]          <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[13FA]          <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[13FA]          <1> 	inc	byte [drv]
   148 00000139 BB[98F9]            <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[15FA]            <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[13FA]          <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[13FA]          <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[18FA]          <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[16FA]          <1> 	sub	bx, hd0_type - 2 ; 15/01/2015
   198 00000195 81C3[62FA]          <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[62FA]          <1> 	sub	bx, drv.status
   207 000001A7 C1E302              <1> 	shl	bx, 2
   208 000001AA 81C3[46FA]          <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[18FA]00        <1> 	mov	byte [bx+hd0_type], 0 ; not a valid disk drive !		
   311 00000234 808F[64FA]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[64FA]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[14FA]          <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[13FA]          <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[62FA]          <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[62FA]          <1> 	sub	bx, drv.status
   363 0000028A D0E3                <1> 	shl	bl, 1
   364 0000028C 81C3[1CFA]          <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[1CFA]          <1> 	sub	bx, drv.cylinders
   369 00000298 81C3[2AFA]          <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[2AFA]          <1>         sub     bx, drv.heads
   375 000002A7 81C3[38FA]          <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[38FA]          <1>         sub     bx, drv.spt
   380 000002B6 D1E3                <1> 	shl	bx, 1
   381 000002B8 81C3[46FA]          <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[80F9]                  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 B9BF090000              	mov  ecx, (bss_end - bss_start)/4
   305                                  	;shr  ecx, 2 ; bss section is already aligned for double words
   306 0000033C BF[BA300100]            	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[0EFA0000]        	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[B0330100]          	mov	[free_pages], ecx
   330 0000035D 668B15[10FA0000]        	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[B0330100]          	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[AC330100]            	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[C0330100]          	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[A8330100]          	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[B8330100]            	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[C0330100]        	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[B0330100]          	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[AC330100]          	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[B0330100]          	sub	[free_pages], ecx ; 07/11/2014
   459                                  	;
   460 00000442 8B35[A8330100]          	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[A8330100]          	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[AC330100]          	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[BC330100]            	mov	[first_page], eax
   531 000004B1 A3[B4330100]            	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[A8330100]                    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[B5020100]            	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 E889010000              	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[78FF0000]            	mov	esi, ilist
   623 00000513 8D3D[C0300100]          	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[9B0A0000]            	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[86F90000]        	lidt 	[idtd]
   670                                  	;
   671                                  	; TSS descriptor setup ; 24/03/2015
   672 0000056C B8[40330100]            	mov	eax, task_state_segment
   673 00000571 66A3[7AF90000]          	mov	[gdt_tss0], ax
   674 00000577 C1C010                  	rol	eax, 16
   675 0000057A A2[7CF90000]            	mov	[gdt_tss1], al
   676 0000057F 8825[7FF90000]          	mov	[gdt_tss2], ah
   677 00000585 66C705[A6330100]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[AC330100]          	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[44330100]          	mov	[tss.esp0], esp
   711 000005B3 66C705[48330100]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 E862170000              	call	_set_cpos	; 24/01/2016
   738                                  	;
   739                                  	; 06/11/2014
   740 000005D7 E8692C0000              	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[18FA0000]          	mov	edx, [hd0_type] ; hd0, hd1, hd2, hd3
   747 000005E3 668B1D[16FA0000]        	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[7E020100]            	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 E89B160000              	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[E5060000]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 E8A03B0000              	CALL	DSKETTE_SETUP	; Initialize Floppy Disks
   785                                  	;
   786 00000619 09D2                    	or	edx, edx
   787 0000061B 7407                            jz      short di3
   788                                  di2:
   789 0000061D E8DE3B0000              	call   	DISK_SETUP	; Initialize Fixed Disks
   790 00000622 72CF                            jc      short setup_error
   791                                  di3:
   792 00000624 E8F02B0000              	call	setup_rtc_int	; 22/05/2015 (dsectrpm.s)
   793                                  	;
   794 00000629 E8E6FA0000              	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 7402                    	jz	short sysinit
   826                                  	; 80387 (FPU) is ready
   827 00000635 DBE3                    	fninit ; Initialize Floating-Point Unit
   828                                  sysinit:
   829                                  	; 30/06/2015
   830 00000637 E826550000              	call	sys_init
   831                                  	;
   832                                  	;jmp 	cpu_reset ; 22/02/2015
   833                                  hang:  
   834                                  	; 23/02/2015
   835                                  	;sti			; Enable interrupts
   836 0000063C F4                      	hlt
   837                                  	;
   838                                  	;nop
   839                                  	;; 03/12/2014
   840                                  	;; 28/08/2014
   841                                  	;mov	ah, 11h
   842                                  	;call	getc
   843                                  	;jz      _c8
   844                                  	;
   845                                  	; 23/02/2015
   846                                  	; 06/02/2015
   847                                  	; 07/09/2014
   848 0000063D 31DB                    	xor	ebx, ebx
   849 0000063F 8A1D[D6330100]          	mov	bl, [ptty]	; active_page
   850 00000645 89DE                    	mov	esi, ebx
   851 00000647 66D1E6                  	shl 	si, 1
   852 0000064A 81C6[D8330100]          	add	esi, ttychr
   853 00000650 668B06                  	mov	ax, [esi]
   854 00000653 6621C0                  	and	ax, ax
   855                                  	;jz	short _c8
   856 00000656 74E4                    	jz	short hang
   857 00000658 66C7060000              	mov	word [esi], 0
   858 0000065D 80FB03                  	cmp	bl, 3		; Video page 3
   859                                  	;jb	short _c8
   860 00000660 72DA                    	jb	short hang
   861                                  	;	
   862                                  	; 13/05/2016
   863                                  	; 07/09/2014
   864                                  nxtl:
   865 00000662 6653                    	push	bx
   866 00000664 66BB0E00                	mov	bx, 0Eh 	; Yellow character 
   867                                  				; on black background
   868                                  				; bh = 0 (video page 0)
   869                                  				; Retro UNIX 386 v1 - Video Mode 0
   870                                  				; (PC/AT Video Mode 3 - 80x25 Alpha.)
   871 00000668 6650                    	push	ax
   872 0000066A E834160000              	call 	_write_tty
   873 0000066F 6658                    	pop	ax
   874 00000671 665B                    	pop	bx
   875 00000673 3C0D                    	cmp	al, 0Dh		; carriage return (enter)
   876                                  	;jne	short _c8
   877 00000675 75C5                    	jne	short hang
   878 00000677 B00A                    	mov	al, 0Ah		; next line
   879 00000679 EBE7                    	jmp	short nxtl
   880                                  	
   881                                  ;_c8:
   882                                  ;	; 25/08/2014
   883                                  ;	cli				; Disable interrupts
   884                                  ;	mov	al, [scounter + 1]
   885                                  ;	and	al, al
   886                                  ;	jnz	hang
   887                                  ;	call	rtc_p
   888                                  ;	jmp     hang
   889                                  
   890                                  
   891                                  	; 27/08/2014
   892                                  	; 20/08/2014
   893                                  printk:
   894                                          ;mov    edi, [scr_row]
   895                                  pkl:
   896 0000067B AC                      	lodsb
   897 0000067C 08C0                    	or 	al, al
   898 0000067E 7404                    	jz	short pkr
   899 00000680 66AB                    	stosw
   900 00000682 EBF7                    	jmp	short pkl
   901                                  pkr:
   902 00000684 C3                      	retn
   903                                  
   904                                  ; 22/01/2017
   905                                  ; 15/01/2017
   906                                  ; 14/01/2017
   907                                  ; 02/01/2017
   908                                  ; 25/12/2016
   909                                  ; 19/12/2016
   910                                  ; 10/12/2016 (callback)
   911                                  ; 06/06/2016
   912                                  ; 23/05/2016
   913                                  ; 22/05/2016 - TRDOS 386 (TRDOS v2.0) Timer Event Modifications
   914                                  ; 25/07/2015
   915                                  ; 14/05/2015 (multi tasking -time sharing- 'clock', x_timer)
   916                                  ; 17/02/2015
   917                                  ; 06/02/2015 (unix386.s)
   918                                  ; 11/12/2014 - 22/12/2014 (dsectrm2.s) 
   919                                  ;
   920                                  ; IBM PC-XT Model 286 Source Code - BIOS2.ASM (06/10/85)
   921                                  ;
   922                                  ;-- HARDWARE INT  08 H - ( IRQ LEVEL 0 ) ---------------------------------------
   923                                  ;	THIS ROUTINE HANDLES THE TIMER INTERRUPT FROM FROM CHANNEL 0 OF        :
   924                                  ;	THE 8254 TIMER.  INPUT FREQUENCY IS 1.19318 MHZ AND THE DIVISOR        :
   925                                  ;	IS 65536, RESULTING IN APPROXIMATELY 18.2 INTERRUPTS EVERY SECOND.     :
   926                                  ;									       :
   927                                  ;	THE INTERRUPT HANDLER MAINTAINS A COUNT (40:6C) OF INTERRUPTS SINCE    :
   928                                  ;	POWER ON TIME, WHICH MAY BE USED TO ESTABLISH TIME OF DAY.	       :
   929                                  ;	THE INTERRUPT HANDLER ALSO DECREMENTS THE MOTOR CONTROL COUNT (40:40)  :
   930                                  ;	OF THE DISKETTE, AND WHEN IT EXPIRES, WILL TURN OFF THE 	       :
   931                                  ;	DISKETTE MOTOR(s), AND RESET THE MOTOR RUNNING FLAGS.		       :
   932                                  ;	THE INTERRUPT HANDLER WILL ALSO INVOKE A USER ROUTINE THROUGH	       :
   933                                  ;	INTERRUPT 1CH AT EVERY TIME TICK.  THE USER MUST CODE A 	       :
   934                                  ;	ROUTINE AND PLACE THE CORRECT ADDRESS IN THE VECTOR TABLE.	       :
   935                                  ;-------------------------------------------------------------------------------
   936                                  ;
   937                                  
   938                                  timer_int:	; IRQ 0
   939                                  ;int_08h:	; Timer
   940                                  	; 14/10/2015
   941                                  	; Here, we are simulating system call entry (for task switch)
   942                                  	; (If multitasking is enabled, 
   943                                  	; 'clock' procedure may jump to 'sysrelease')
   944                                  
   945 00000685 1E                      	push	ds
   946 00000686 06                      	push	es
   947 00000687 0FA0                    	push	fs
   948 00000689 0FA8                    	push	gs
   949                                  
   950 0000068B 60                      	pushad	; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
   951 0000068C 66B91000                	mov     cx, KDATA
   952 00000690 8ED9                            mov     ds, cx
   953 00000692 8EC1                            mov     es, cx
   954 00000694 8EE1                            mov     fs, cx
   955 00000696 8EE9                            mov     gs, cx
   956                                  
   957 00000698 0F20D9                  	mov	ecx, cr3
   958 0000069B 890D[784A0100]          	mov	[cr3reg], ecx ; save current cr3 register value/content
   959                                  
   960                                  	; 14/01/2017
   961 000006A1 3B0D[A8330100]          	cmp 	ecx, [k_page_dir]
   962 000006A7 7409                    	je	short T3
   963                                  
   964 000006A9 8B0D[A8330100]          	mov	ecx, [k_page_dir]
   965 000006AF 0F22D9                  	mov	cr3, ecx
   966                                  T3:
   967                                  	;sti				; INTERRUPTS BACK ON
   968 000006B2 66FF05[28340100]        	INC	word [TIMER_LOW]	; INCREMENT TIME
   969 000006B9 7507                    	JNZ	short T4		; GO TO TEST_DAY
   970 000006BB 66FF05[2A340100]        	INC	word [TIMER_HIGH]	; INCREMENT HIGH WORD OF TIME
   971                                  T4:					; TEST_DAY
   972 000006C2 66833D[2A340100]18      	CMP	word [TIMER_HIGH],018H	; TEST FOR COUNT EQUALING 24 HOURS
   973 000006CA 7519                    	JNZ	short T5		; GO TO DISKETTE_CTL
   974 000006CC 66813D[28340100]B0-     	CMP	word [TIMER_LOW],0B0H
   974 000006D4 00                 
   975 000006D5 750E                    	JNZ	short T5		; GO TO DISKETTE_CTL
   976                                  
   977                                  ;-----	TIMER HAS GONE 24 HOURS
   978                                  	;;SUB	AX,AX
   979                                  	;MOV	[TIMER_HIGH],AX
   980                                  	;MOV	[TIMER_LOW],AX
   981 000006D7 29C0                    	sub	eax, eax
   982 000006D9 A3[28340100]            	mov	[TIMER_LH], eax
   983                                  	;	
   984 000006DE C605[2C340100]01        	MOV	byte [TIMER_OFL],1
   985                                  
   986                                  ;-----	TEST FOR DISKETTE TIME OUT
   987                                  
   988                                  T5:
   989                                  	; 23/12/2014
   990 000006E5 EB1D                    	jmp	short T6		; will be replaced with nop, nop
   991                                  					; (9090h) if a floppy disk
   992                                  					; is detected.
   993                                  	;mov	al,[CS:MOTOR_COUNT]
   994 000006E7 A0[2F340100]            	mov	al, [MOTOR_COUNT]
   995 000006EC FEC8                    	dec	al
   996                                  	;mov	[CS:MOTOR_COUNT], al	; DECREMENT DISKETTE MOTOR CONTROL
   997 000006EE A2[2F340100]            	mov	[MOTOR_COUNT], al
   998                                  	;mov	[ORG_MOTOR_COUNT], al
   999 000006F3 750F                    	JNZ	short T6		; RETURN IF COUNT NOT OUT
  1000 000006F5 B0F0                    	mov 	al,0F0h
  1001                                  	;AND	[CS:MOTOR_STATUS],al 	; TURN OFF MOTOR RUNNING BITS
  1002 000006F7 2005[2E340100]          	and	[MOTOR_STATUS], al
  1003                                  	;and	[ORG_MOTOR_STATUS], al
  1004 000006FD B00C                    	MOV	AL,0CH			; bit 3 = enable IRQ & DMA, 
  1005                                  					; bit 2 = enable controller
  1006                                  					;	1 = normal operation
  1007                                  					;	0 = reset	
  1008                                  					; bit 0, 1 = drive select
  1009                                  					; bit 4-7 = motor running bits 
  1010 000006FF 66BAF203                	MOV	DX,03F2H		; FDC CTL PORT
  1011 00000703 EE                      	OUT	DX,AL			; TURN OFF THE MOTOR
  1012                                  T6:	
  1013                                  	;inc	word [CS:wait_count]	; 22/12/2014 (byte -> word)
  1014                                  					; TIMER TICK INTERRUPT
  1015                                  	;;inc	word [wait_count] ;;27/02/2015
  1016                                  	;INT	1CH			; TRANSFER CONTROL TO A USER ROUTINE
  1017                                  	;cli
  1018 00000704 E84E040000              	call 	u_timer			; TRANSFER CONTROL TO A USER ROUTINE
  1019                                  	; 23/05/2016
  1020 00000709 E8CAE30000              	call	clock			; Multi Tasking control procedure
  1021                                  T7:
  1022                                  	; 14/10/2015
  1023 0000070E B020                    	MOV	AL,EOI			; GET END OF INTERRUPT MASK
  1024 00000710 FA                      	CLI				; DISABLE INTERRUPTS TILL STACK CLEARED
  1025 00000711 E620                    	OUT	INTA00,AL		; END OF INTERRUPT TO 8259 - 1	
  1026                                  	;
  1027                                  rtc_int_2:
  1028                                  	; 26/12/2016
  1029                                  	;mov	ecx, [cr3reg]
  1030                                  	; 13/01/2017
  1031 00000713 803D[544A0100]00        	cmp	byte [u.t_lock], 0  	; T_LOCK
  1032 0000071A 7727                    	ja	short timer_int_return  ; Timer Lock : 'sysrele' is needed !
  1033                                  	; 15/01/2017
  1034 0000071C 803D[3C410100]02        	cmp	byte [priority], 2
  1035 00000723 733A                    	jnb	short T8  ; current process has a timer event (15/01/2017)
  1036                                  	; 22/05/2016
  1037 00000725 803D[3D410100]00        	cmp	byte [p_change], 0 ; in 'set_run_sequence', in 'rtc_p'
  1038 0000072C 7615                    	jna	short timer_int_return ; 23/05/2016
  1039                                  
  1040                                  	; 15/01/2017
  1041                                  	
  1042                                  	; present process must be changed with high priority process	
  1043                                  	;xor	al, al
  1044 0000072E 31C0                    	xor	eax, eax ; 26/12/2016
  1045 00000730 A2[3D410100]            	mov	[p_change], al ; 0
  1046                                  	;mov	byte [priority], 2 ; 15/01/2017 (there is a timer event)
  1047                                  
  1048 00000735 803D[DB490100]FF        	cmp     byte [sysflg], 0FFh ; user or system space ?
  1049 0000073C 7416                    	je	short rtc_int_3     ; user space ([sysflg]= 0FFh)
  1050                                  
  1051                                  	; system space, wait for 'sysret'
  1052                                  	; to change running process 	
  1053                                  	; with high priority (event) process
  1054                                  
  1055 0000073E A2[284A0100]            	mov	[u.quant], al ; 0
  1056                                  
  1057                                  timer_int_return: ; 23/05/2016 - jump from 'rtc_int' ('rtc_int_2')
  1058 00000743 8B0D[784A0100]          	mov 	ecx, [cr3reg] 	; previous value/content of cr3 register
  1059 00000749 0F22D9                   	mov	cr3, ecx	; restore cr3 register content
  1060                                  	;
  1061 0000074C 61                      	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
  1062                                  	;
  1063 0000074D 0FA9                    	pop	gs
  1064 0000074F 0FA1                    	pop	fs
  1065 00000751 07                      	pop	es
  1066 00000752 1F                      	pop	ds
  1067                                  	;
  1068 00000753 CF                      	iretd	; return from interrupt
  1069                                  
  1070                                  rtc_int_3:
  1071 00000754 FE05[DB490100]          	inc	byte [sysflg] 	; now, we are in system space
  1072                                  	;
  1073 0000075A E97CB60000                      jmp     sysrelease ; change running process immediatelly 
  1074                                  
  1075                                  T8:
  1076                                  	; 13/01/2017 (eax -> ebx)
  1077                                  	; callback checking... (19/12/2016)
  1078 0000075F 31DB                    	xor	ebx, ebx
  1079 00000761 871D[504A0100]          	xchg	ebx, [u.tcb] ; callback address (0 = normal return)
  1080 00000767 09DB                    	or	ebx, ebx
  1081 00000769 74D8                    	jz	short timer_int_return
  1082                                  
  1083                                  	; Set user's callback routine as return address from this interrupt
  1084                                  	; and set normal return address as return address from callback
  1085                                  	; routine!!! (19/12/2016)
  1086                                  	
  1087                                  	; 14/01/2017
  1088                                  	; 13/01/2017 - Timer Lock (T_LOCK)
  1089 0000076B FE05[544A0100]          	inc	byte [u.t_lock]
  1090 00000771 8A0D[DB490100]          	mov	cl, [sysflg]
  1091 00000777 880D[554A0100]          	mov	[u.t_mode], cl 
  1092                                  
  1093 0000077D 8B2D[44330100]          	mov	ebp, [tss.esp0] ; kernel stack address (for ring 0)
  1094 00000783 83ED14                  	sub	ebp, 20		; eip, cs, eflags, esp, ss
  1095 00000786 892D[DC490100]           	mov	[u.sp], ebp
  1096 0000078C 8925[E0490100]          	mov	[u.usp], esp
  1097                                  
  1098                                  	;or	word [ebp+8], 200h ; 22/01/2017, force enabling interrupts
  1099                                  
  1100 00000792 8B44241C                	mov	eax, [esp+28] ; pushed eax
  1101 00000796 A3[E4490100]            	mov	[u.r0], eax
  1102                                  
  1103 0000079B E8C3D70000              	call	wswap ; save user's registers & status
  1104                                  
  1105                                  	; software int is in ring 0 but timer int must return to ring 3
  1106                                  	; so, ring 3 return address and stack registers
  1107                                  	; (eip, cs, eflags, esp, ss) 
  1108                                  	; must be copied to timer int return
  1109                                  	; eip will be replaced by callback service routine address
  1110                                  
  1111 000007A0 C605[DB490100]FF        	mov	byte [sysflg], 0FFh ; user mode
  1112                                  
  1113                                  	; system mode (system call)
  1114                                  	;mov	ebp, [u.sp] ; EIP (u), CS (UCODE), EFLAGS (u),
  1115                                  			    ; ESP (u), SS (UDATA)
  1116                                  
  1117 000007A7 8B4510                  	mov	eax, [ebp+16]	; SS (UDATA
  1118 000007AA 89E6                    	mov	esi, esp
  1119 000007AC 50                      	push	eax
  1120 000007AD 50                      	push	eax
  1121 000007AE 89E7                    	mov	edi, esp
  1122 000007B0 893D[E0490100]          	mov	[u.usp], edi
  1123 000007B6 B908000000              	mov	ecx, ((ESPACE/4) - 4) ; except DS, ES, FS, GS
  1124 000007BB F3A5                    	rep	movsd
  1125 000007BD B104                    	mov	cl, 4	
  1126 000007BF F3AB                    	rep	stosd
  1127 000007C1 893D[DC490100]          	mov	[u.sp], edi
  1128 000007C7 89EE                    	mov	esi, ebp
  1129 000007C9 B105                    	mov	cl, 5 ; EIP (u), CS (UCODE), EFLAGS (u), ESP (u), SS (UDATA)
  1130 000007CB F3A5                    	rep	movsd
  1131                                  
  1132 000007CD 8B0D[384A0100]          	mov	ecx, [u.pgdir]
  1133 000007D3 890D[784A0100]          	mov	[cr3reg], ecx
  1134                                  
  1135                                  	; 13/01/207 (eax -> ebx)
  1136                                  	; EBX = callback routine address (virtual, not physical address!)
  1137                                  
  1138                                  	; 09/01/2017
  1139                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'sysrele'
  1140                                  	;     system call !!!	
  1141                                  	; 25/12/2016
  1142                                  	; Callback Note: (19/12/2016)
  1143                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'RETN' !!!
  1144                                  	;	pushf ; save flags	
  1145                                  	; 	<callback service code>
  1146                                  	; 	popf  ; restore flags
  1147                                  	; 	retn ; return to normal running address
  1148                                  	;
  1149                                  
  1150                                  	; 15/01/2017
  1151                                  	; 14/01/2017
  1152                                  	; 13/01/207 (eax -> ebx)
  1153                                  	; 10/01/2017
  1154                                  set_callback_addr:
  1155                                  	; 09/01/2017 (**)
  1156                                  	; 02/01/2017 (*)
  1157                                  	; 25/12/2016 (*)
  1158                                  	; 19/12/2016 (TRDOS 386 feature only!)
  1159                                  	;
  1160                                  	; This routine sets return address
  1161                                  	; to start of user's interrupt
  1162                                  	; service (callback) address
  1163                                  	;; and sets callback 'retn' address to normal
  1164                                  	;; return address of user's running code! 
  1165                                  	;
  1166                                  	; INPUT:
  1167                                  	;	EBX = callback routine/service address
  1168                                  	;	      (virtual, not physical address!)	
  1169                                  	;	[u.sp] = kernel stack, points to
  1170                                  	;		 user's EIP,CS,EFLAGS,ESP,SS
  1171                                  	;		 registers.
  1172                                  	; OUTPUT:
  1173                                  	;	EIP (user) = callback (service) address
  1174                                  	;	CS (user) = UCODE
  1175                                  	;	EFLAGS (user) = flags before callback 	 
  1176                                  	;       ESP (user) = ESP-4 (user, before callback) 
  1177                                  	;	[ESP](user) = EIP (user) before callback
  1178                                  	;
  1179                                  	; Note: If CPU was in user mode while entering 
  1180                                  	;	the timer interrupt service routine,
  1181                                  	;	'IRET' will get return to callback routine
  1182                                  	;	immediately. If CPU was in system/kernel mode  
  1183                                  	;	'iret' will get return to system call and
  1184                                  	;	then, callback routine will be return address
  1185                                  	;	from system call. (User's callback/service code
  1186                                  	;	will be able to return to normal return address
  1187                                  	;	via an 'retn' at the end.) 
  1188                                  	;
  1189                                  	; Note(**): User's callback service code must be ended
  1190                                  	;	with a 'sysrele' sytstem call ! (09/01/2017)
  1191                                  	;
  1192                                  	;	For example:
  1193                                  	;
  1194                                  	;	timer_callback:
  1195                                  	;	    ...	 
  1196                                    	;	    inc	dword [time_counter]
  1197                                  	;	    ...
  1198                                  	;	    mov eax, 39 ; 'sysrele'
  1199                                  	;	    int 40h ; TRDOS 386 system call (interrupt)		
  1200                                  	;
  1201                                  	;
  1202                                  	;; Note(*): User's callback service code must preserve cpu 
  1203                                  	;;	flags if it has any instructions which changes
  1204                                  	;;	flags in the service code. (25/12/2016)
  1205                                  	;;
  1206                                  	;;	For example:
  1207                                  	;;
  1208                                  	;;	timer_callback:
  1209                                  	;;	    pushf ; save flags
  1210                                  	;;	    ; this instruction changes zero flag
  1211                                    	;;	    inc	dword [time_counter]
  1212                                  	;;	    popf ; restore flags
  1213                                  	;;	    retn ; return to normal user code
  1214                                  	;;		  (which is interrupted by the 
  1215                                  	;;		   timer interput) 	
  1216                                  	;;
  1217                                  
  1218                                  	; 15/01/2017
  1219 000007D9 8B2D[DC490100]          	mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
  1220 000007DF 895D00                  	mov	[ebp], ebx
  1221 000007E2 E95CFFFFFF              	jmp	timer_int_return
  1222                                  
  1223                                  	; 15/01/2017
  1224                                  	; 13/01/2017
  1225                                  	; 19/12/2016
  1226                                  	; 06/06/2016
  1227                                  	; 23/05/2016
  1228                                  	; 22/05/2016
  1229                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1230                                  	; 26/02/2015
  1231                                  	; 07/09/2014
  1232                                  	; 25/08/2014
  1233                                  rtc_int:       ; Real Time Clock Interrupt (IRQ 8)
  1234                                  	; 22/05/2016
  1235 000007E7 1E                      	push	ds ; ** ; 23/05/2016
  1236 000007E8 50                      	push	eax ; *
  1237 000007E9 66B81000                	mov	ax, KDATA
  1238 000007ED 8ED8                    	mov	ds, ax
  1239                                  	;
  1240 000007EF 8A25[26340100]          	mov	ah, [RTC_2Hz] ;  2 Hz interrupt to 1 Hz function
  1241 000007F5 80F401                  	xor	ah, 1
  1242 000007F8 8825[26340100]          	mov	[RTC_2Hz], ah ; 1 = 0.5 second, 0 = 1 second
  1243 000007FE 753B                    	jnz	short rtc_int_return ; half second
  1244                                  	; 1 second
  1245                                  rtc_int_0:
  1246                                  	; 22/05/2016
  1247 00000800 58                      	pop	eax ; *
  1248                                  	;
  1249                                  	; 14/10/2015 ('timer_int')
  1250                                  	; Here, we are simulating system call entry (for task switch)
  1251                                  	; (If multitasking is enabled, 
  1252                                  	; 'clock' procedure may jump to 'sysrelease')
  1253                                  	;push	ds ; ** ; 23/05/2016
  1254 00000801 06                      	push	es
  1255 00000802 0FA0                    	push	fs
  1256 00000804 0FA8                    	push	gs
  1257 00000806 60                      	pushad  ; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
  1258 00000807 66B91000                	mov     cx, KDATA
  1259                                          ;mov    ds, cx ; 06/06/2016
  1260 0000080B 8EC1                            mov     es, cx
  1261 0000080D 8EE1                            mov     fs, cx
  1262 0000080F 8EE9                            mov     gs, cx
  1263                                  	;
  1264 00000811 0F20D9                  	mov	ecx, cr3
  1265 00000814 890D[784A0100]          	mov	[cr3reg], ecx ; save current cr3 register value/content
  1266                                  	;
  1267 0000081A 803D[544A0100]00        	cmp	byte [u.t_lock], 0 ; timer lock (callback) status ?
  1268 00000821 7711                    	ja	short rtc_int_1	   ; yes
  1269                                  
  1270                                  	; 15/01/2017
  1271 00000823 3B0D[A8330100]          	cmp 	ecx, [k_page_dir]
  1272 00000829 7409                    	je	short rtc_int_1
  1273                                  
  1274 0000082B 8B0D[A8330100]          	mov	ecx, [k_page_dir]
  1275 00000831 0F22D9                  	mov	cr3, ecx
  1276                                  rtc_int_1:
  1277                                  	; Timer event (kernel) functions must be performed with
  1278                                  	; 1 second intervals - TRDOS 386 (TRDOS v2.0) feature ! -
  1279                                   	;	
  1280                                  	; 25/08/2014
  1281 00000834 E81A030000              	call	rtc_p  ; 19/05/2016 - major modification 
  1282                                  	
  1283                                  	; 23/05/2016
  1284 00000839 28E4                    	sub	ah, ah ; 0
  1285                                  	; 22/05/2016 - TRDOS 386 timer event modifications
  1286                                  rtc_int_return: ; 19/05/2016
  1287                                  	; 22/02/2015 - dsectpm.s
  1288                                  	; [ source: http://wiki.osdev.org/RTC ]
  1289                                  	; read status register C to complete procedure
  1290                                  	;(it is needed to get a next IRQ 8) 
  1291 0000083B B00C                    	mov	al, 0Ch ; 
  1292 0000083D E670                    	out	70h, al ; select register C
  1293 0000083F 90                      	nop
  1294 00000840 E471                    	in	al, 71h ; just throw away contents
  1295                                  	; 22/02/2015
  1296 00000842 B020                    	MOV	AL,EOI		; END OF INTERRUPT
  1297                                  	;CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  1298 00000844 E6A0                    	OUT	INTB00,AL	; FOR CONTROLLER #2
  1299                                  
  1300                                  	; 23/05/2016
  1301 00000846 B020                    	MOV	AL,EOI		; GET END OF INTERRUPT MASK
  1302 00000848 FA                      	CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  1303 00000849 E620                    	OUT	INTA00,AL	; END OF INTERRUPT TO 8259 - 1	
  1304                                  	;
  1305                                  	; 23/05/2016
  1306 0000084B 20E4                    	and	ah, ah
  1307 0000084D 0F84C0FEFFFF                    jz      rtc_int_2
  1308                                  	
  1309                                  	; ah = 1 (half second)
  1310 00000853 58                      	pop	eax ; *
  1311 00000854 1F                      	pop	ds  ; **
  1312 00000855 CF                      	iretd
  1313                                  
  1314                                  ; ////////////////
  1315                                  
  1316                                  	; 28/08/2014
  1317                                  irq0:
  1318 00000856 6A00                            push 	dword 0
  1319 00000858 EB48                    	jmp	short which_irq
  1320                                  irq1:
  1321 0000085A 6A01                            push 	dword 1
  1322 0000085C EB44                    	jmp	short which_irq
  1323                                  irq2:
  1324 0000085E 6A02                            push 	dword 2
  1325 00000860 EB40                    	jmp	short which_irq
  1326                                  irq3:
  1327                                  	; 20/11/2015
  1328                                  	; 24/10/2015
  1329 00000862 2EFF15[78ED0000]        	call	dword [cs:com2_irq3]
  1330 00000869 6A03                    	push 	dword 3
  1331 0000086B EB35                    	jmp	short which_irq
  1332                                  irq4:
  1333                                  	; 20/11/2015
  1334                                  	; 24/10/2015
  1335 0000086D 2EFF15[74ED0000]        	call	dword [cs:com1_irq4]
  1336 00000874 6A04                            push 	dword 4
  1337 00000876 EB2A                    	jmp	short which_irq
  1338                                  irq5:
  1339 00000878 6A05                            push 	dword 5
  1340 0000087A EB26                    	jmp	short which_irq
  1341                                  irq6:
  1342 0000087C 6A06                            push 	dword 6
  1343 0000087E EB22                    	jmp	short which_irq
  1344                                  irq7:
  1345 00000880 6A07                            push 	dword 7
  1346 00000882 EB1E                    	jmp	short which_irq
  1347                                  irq8:
  1348 00000884 6A08                            push 	dword 8
  1349 00000886 EB1A                    	jmp	short which_irq
  1350                                  irq9:
  1351 00000888 6A09                            push 	dword 9
  1352 0000088A EB16                    	jmp	short which_irq
  1353                                  irq10:
  1354 0000088C 6A0A                            push 	dword 10
  1355 0000088E EB12                    	jmp	short which_irq
  1356                                  irq11:
  1357 00000890 6A0B                            push 	dword 11
  1358 00000892 EB0E                    	jmp	short which_irq
  1359                                  irq12:
  1360 00000894 6A0C                            push 	dword 12
  1361 00000896 EB0A                    	jmp	short which_irq
  1362                                  irq13:
  1363 00000898 6A0D                            push 	dword 13
  1364 0000089A EB06                    	jmp	short which_irq
  1365                                  irq14:
  1366 0000089C 6A0E                            push 	dword 14
  1367 0000089E EB02                    	jmp	short which_irq
  1368                                  irq15:
  1369 000008A0 6A0F                            push 	dword 15
  1370                                  	;jmp	short which_irq
  1371                                  
  1372                                  	; 22/01/2017
  1373                                  	; 19/10/2015
  1374                                  	; 29/08/2014
  1375                                  	; 21/08/2014
  1376                                  which_irq:
  1377 000008A2 870424                  	xchg	eax, [esp]  ; 28/08/2014
  1378 000008A5 53                      	push	ebx
  1379 000008A6 56                      	push	esi
  1380 000008A7 57                      	push	edi
  1381 000008A8 1E                      	push 	ds
  1382 000008A9 06                      	push 	es
  1383                                  	;
  1384 000008AA 88C3                    	mov	bl, al
  1385                                  	;
  1386 000008AC B810000000              	mov	eax, KDATA
  1387 000008B1 8ED8                    	mov	ds, ax
  1388 000008B3 8EC0                    	mov	es, ax
  1389                                  	; 19/10/2015
  1390 000008B5 FC                      	cld
  1391                                          ; 27/08/2014
  1392 000008B6 8105[6EFF0000]A000-             add     dword [scr_row], 0A0h
  1392 000008BE 0000               
  1393                                  	;
  1394 000008C0 B417                    	mov	ah, 17h	; blue (1) background, 
  1395                                  			; light gray (7) forecolor
  1396 000008C2 8B3D[6EFF0000]                  mov     edi, [scr_row]
  1397 000008C8 B049                    	mov	al, 'I'
  1398 000008CA 66AB                    	stosw
  1399 000008CC B052                    	mov	al, 'R'
  1400 000008CE 66AB                    	stosw
  1401 000008D0 B051                    	mov	al, 'Q'
  1402 000008D2 66AB                    	stosw
  1403 000008D4 B020                    	mov	al, ' '
  1404 000008D6 66AB                    	stosw
  1405 000008D8 88D8                    	mov	al, bl
  1406 000008DA 3C0A                    	cmp	al, 10
  1407 000008DC 7208                    	jb	short ii1
  1408 000008DE B031                    	mov	al, '1'
  1409 000008E0 66AB                    	stosw
  1410 000008E2 88D8                    	mov	al, bl
  1411 000008E4 2C0A                    	sub	al, 10
  1412                                  ii1:
  1413 000008E6 0430                    	add	al, '0'
  1414 000008E8 66AB                    	stosw
  1415 000008EA B020                    	mov	al, ' '
  1416 000008EC 66AB                    	stosw
  1417 000008EE B021                    	mov	al, '!'
  1418 000008F0 66AB                    	stosw
  1419 000008F2 B020                    	mov	al, ' '
  1420 000008F4 66AB                    	stosw
  1421                                  	; 23/02/2015
  1422 000008F6 80FB07                  	cmp	bl, 7 ; check for IRQ 8 to IRQ 15 
  1423 000008F9 7604                    	jna	ii2
  1424                                  	; 22/01/2017
  1425 000008FB B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1426 000008FD E6A0                    	out	0A0h, al ; the 2nd 8259
  1427                                  ii2:
  1428 000008FF B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1429 00000901 E620                    	out	20h, al ; the 2nd 8259
  1430 00000903 E9CD010000              	jmp     iiret
  1431                                  	;
  1432                                  	; 22/08/2014
  1433                                  	;mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  1434                                  	;out	20h, al	; 8259 PORT
  1435                                  	;
  1436                                  	;pop	es
  1437                                  	;pop	ds
  1438                                  	;pop	edi
  1439                                  	;pop	esi
  1440                                  	;pop	ebx
  1441                                  	;pop 	eax
  1442                                  	;iret
  1443                                  
  1444                                  	; 02/04/2015
  1445                                  	; 25/08/2014
  1446                                  exc0:
  1447 00000908 6A00                            push 	dword 0
  1448 0000090A E990000000                      jmp     cpu_except
  1449                                  exc1:
  1450 0000090F 6A01                            push 	dword 1
  1451 00000911 E989000000                      jmp     cpu_except
  1452                                  exc2:
  1453 00000916 6A02                            push 	dword 2
  1454 00000918 E982000000                      jmp     cpu_except
  1455                                  exc3:
  1456 0000091D 6A03                            push 	dword 3
  1457 0000091F EB7E                            jmp     cpu_except
  1458                                  exc4:
  1459 00000921 6A04                            push 	dword 4
  1460 00000923 EB7A                            jmp     cpu_except
  1461                                  exc5:
  1462 00000925 6A05                            push 	dword 5
  1463 00000927 EB76                            jmp     cpu_except
  1464                                  exc6:
  1465 00000929 6A06                            push 	dword 6
  1466 0000092B EB72                            jmp     cpu_except
  1467                                  exc7:
  1468 0000092D 6A07                            push 	dword 7
  1469 0000092F EB6E                            jmp     cpu_except
  1470                                  exc8:
  1471                                  	; [esp] = Error code
  1472 00000931 6A08                            push 	dword 8
  1473 00000933 EB5C                            jmp     cpu_except_en
  1474                                  exc9:
  1475 00000935 6A09                            push 	dword 9
  1476 00000937 EB66                            jmp     cpu_except
  1477                                  exc10:
  1478                                  	; [esp] = Error code
  1479 00000939 6A0A                            push 	dword 10
  1480 0000093B EB54                            jmp     cpu_except_en
  1481                                  exc11:
  1482                                  	; [esp] = Error code
  1483 0000093D 6A0B                            push 	dword 11
  1484 0000093F EB50                            jmp     cpu_except_en
  1485                                  exc12:
  1486                                  	; [esp] = Error code
  1487 00000941 6A0C                            push 	dword 12
  1488 00000943 EB4C                            jmp     cpu_except_en
  1489                                  exc13:
  1490                                  	; [esp] = Error code
  1491 00000945 6A0D                            push 	dword 13
  1492 00000947 EB48                            jmp     cpu_except_en
  1493                                  exc14:
  1494                                  	; [esp] = Error code
  1495 00000949 6A0E                            push 	dword 14
  1496 0000094B EB44                    	jmp	short cpu_except_en
  1497                                  exc15:
  1498 0000094D 6A0F                            push 	dword 15
  1499 0000094F EB4E                            jmp     cpu_except
  1500                                  exc16:
  1501 00000951 6A10                            push 	dword 16
  1502 00000953 EB4A                            jmp     cpu_except
  1503                                  exc17:
  1504                                  	; [esp] = Error code
  1505 00000955 6A11                            push 	dword 17
  1506 00000957 EB38                    	jmp	short cpu_except_en
  1507                                  exc18:
  1508 00000959 6A12                            push 	dword 18
  1509 0000095B EB42                    	jmp	short cpu_except
  1510                                  exc19:
  1511 0000095D 6A13                            push 	dword 19
  1512 0000095F EB3E                    	jmp	short cpu_except
  1513                                  exc20:
  1514 00000961 6A14                            push 	dword 20
  1515 00000963 EB3A                    	jmp	short cpu_except
  1516                                  exc21:
  1517 00000965 6A15                            push 	dword 21
  1518 00000967 EB36                    	jmp	short cpu_except
  1519                                  exc22:
  1520 00000969 6A16                            push 	dword 22
  1521 0000096B EB32                    	jmp	short cpu_except
  1522                                  exc23:
  1523 0000096D 6A17                            push 	dword 23
  1524 0000096F EB2E                    	jmp	short cpu_except
  1525                                  exc24:
  1526 00000971 6A18                            push 	dword 24
  1527 00000973 EB2A                    	jmp	short cpu_except
  1528                                  exc25:
  1529 00000975 6A19                            push 	dword 25
  1530 00000977 EB26                    	jmp	short cpu_except
  1531                                  exc26:
  1532 00000979 6A1A                            push 	dword 26
  1533 0000097B EB22                    	jmp	short cpu_except
  1534                                  exc27:
  1535 0000097D 6A1B                            push 	dword 27
  1536 0000097F EB1E                    	jmp	short cpu_except
  1537                                  exc28:
  1538 00000981 6A1C                            push 	dword 28
  1539 00000983 EB1A                    	jmp	short cpu_except
  1540                                  exc29:
  1541 00000985 6A1D                            push 	dword 29
  1542 00000987 EB16                    	jmp	short cpu_except
  1543                                  exc30:
  1544 00000989 6A1E                            push 	dword 30
  1545 0000098B EB04                    	jmp	short cpu_except_en
  1546                                  exc31:
  1547 0000098D 6A1F                            push 	dword 31
  1548 0000098F EB0E                            jmp     short cpu_except
  1549                                  
  1550                                  	; 19/10/2015
  1551                                  	; 19/09/2015
  1552                                  	; 01/09/2015
  1553                                  	; 28/08/2015
  1554                                  	; 28/08/2014
  1555                                  cpu_except_en:
  1556 00000991 87442404                	xchg	eax, [esp+4] ; Error code
  1557 00000995 36A3[944B0100]          	mov	[ss:error_code], eax
  1558 0000099B 58                      	pop	eax  ; Exception number
  1559 0000099C 870424                  	xchg	eax, [esp]
  1560                                  		; eax = eax before exception
  1561                                  		; [esp] -> exception number
  1562                                  		; [esp+4] -> EIP to return
  1563                                  	; 22/01/2017
  1564                                  	; 19/10/2015
  1565                                  	; 19/09/2015
  1566                                  	; 01/09/2015
  1567                                  	; 28/08/2015
  1568                                  	; 29/08/2014
  1569                                  	; 28/08/2014
  1570                                  	; 25/08/2014
  1571                                  	; 21/08/2014
  1572                                  cpu_except:	; CPU Exceptions
  1573 0000099F FC                      	cld
  1574 000009A0 870424                  	xchg	eax, [esp] 
  1575                                  		; eax = Exception number
  1576                                  		; [esp] = eax (before exception)	
  1577 000009A3 53                      	push	ebx
  1578 000009A4 56                      	push	esi
  1579 000009A5 57                      	push	edi
  1580 000009A6 1E                      	push 	ds
  1581 000009A7 06                      	push 	es
  1582                                  	; 28/08/2015
  1583 000009A8 66BB1000                	mov	bx, KDATA
  1584 000009AC 8EDB                    	mov	ds, bx
  1585 000009AE 8EC3                    	mov	es, bx
  1586 000009B0 0F20DB                  	mov	ebx, cr3
  1587 000009B3 53                      	push	ebx ; (*) page directory
  1588                                  	; 19/10/2015
  1589 000009B4 FC                      	cld
  1590                                  	; 25/03/2015
  1591 000009B5 8B1D[A8330100]          	mov	ebx, [k_page_dir]
  1592 000009BB 0F22DB                  	mov	cr3, ebx
  1593                                  	; 28/08/2015
  1594 000009BE 83F80E                  	cmp	eax, 0Eh ; 14, PAGE FAULT	
  1595 000009C1 750F                    	jne	short cpu_except_nfp
  1596 000009C3 E87B440000              	call	page_fault_handler
  1597 000009C8 21C0                    	and 	eax, eax
  1598 000009CA 0F8401010000                    jz	iiretp ; 01/09/2015
  1599 000009D0 B00E                    	mov	al, 0Eh ; 14
  1600                                  cpu_except_nfp:
  1601                                  	; 23/08/2016
  1602 000009D2 803D[E2FB0000]03        	cmp	byte [CRT_MODE], 3
  1603 000009D9 7409                    	je	short cpu_except_mode_3
  1604 000009DB 50                      	push	eax
  1605 000009DC B003                    	mov	al, 3
  1606 000009DE E8730B0000              	call	_set_mode
  1607 000009E3 58                      	pop	eax
  1608                                  cpu_except_mode_3:
  1609                                  	; 02/04/2015
  1610 000009E4 BB[3C060000]            	mov	ebx, hang
  1611 000009E9 875C241C                	xchg	ebx, [esp+28]
  1612                                  		; EIP (points to instruction which faults)
  1613                                  	  	; New EIP (hang)
  1614 000009ED 891D[984B0100]          	mov	[FaultOffset], ebx
  1615 000009F3 C744242008000000        	mov	dword [esp+32], KCODE ; kernel's code segment
  1616 000009FB 814C242400020000        	or	dword [esp+36], 200h ; enable interrupts (set IF)
  1617                                  	;
  1618 00000A03 88C4                    	mov	ah, al
  1619 00000A05 240F                    	and	al, 0Fh
  1620 00000A07 3C09                    	cmp	al, 9
  1621 00000A09 7602                    	jna	short h1ok
  1622 00000A0B 0407                    	add	al, 'A'-':'
  1623                                  h1ok:
  1624 00000A0D C0EC04                  	shr	ah, 4
  1625 00000A10 80FC09                  	cmp	ah, 9
  1626 00000A13 7603                    	jna	short h2ok
  1627 00000A15 80C407                  	add	ah, 'A'-':'
  1628                                  h2ok:	
  1629 00000A18 86E0                    	xchg 	ah, al	
  1630 00000A1A 66053030                	add	ax, '00'
  1631 00000A1E 66A3[C8010100]          	mov	[excnstr], ax
  1632                                  	;
  1633                                  	; 29/08/2014
  1634 00000A24 A1[984B0100]            	mov	eax, [FaultOffset]
  1635 00000A29 51                      	push	ecx
  1636 00000A2A 52                      	push	edx
  1637 00000A2B 89E3                    	mov	ebx, esp
  1638                                  	; 28/08/2015
  1639 00000A2D B910000000              	mov	ecx, 16	  ; divisor value to convert binary number
  1640                                  			  ; to hexadecimal string
  1641                                  	;mov	ecx, 10	    ; divisor to convert	
  1642                                  			    ; binary number to decimal string
  1643                                  b2d1:
  1644 00000A32 31D2                    	xor	edx, edx
  1645 00000A34 F7F1                    	div	ecx
  1646 00000A36 6652                    	push	dx
  1647 00000A38 39C8                    	cmp	eax, ecx
  1648 00000A3A 73F6                    	jnb	short b2d1
  1649 00000A3C BF[D3010100]            	mov	edi, EIPstr ; EIP value
  1650                                  			    ; points to instruction which faults	
  1651                                  	; 28/08/2015
  1652 00000A41 89C2                    	mov	edx, eax
  1653                                  b2d2:
  1654                                  	;add	al, '0'
  1655 00000A43 8A82[0C330000]          	mov	al, [edx+hexchrs]
  1656 00000A49 AA                      	stosb		    ; write hexadecimal digit to its place	
  1657 00000A4A 39E3                    	cmp	ebx, esp
  1658 00000A4C 7606                    	jna	short b2d3
  1659 00000A4E 6658                    	pop	ax
  1660 00000A50 88C2                    	mov	dl, al
  1661 00000A52 EBEF                    	jmp	short b2d2
  1662                                  b2d3:
  1663 00000A54 B068                    	mov 	al, 'h' ; 28/08/2015
  1664 00000A56 AA                      	stosb
  1665 00000A57 B020                    	mov	al, 20h	    ; space
  1666 00000A59 AA                      	stosb
  1667 00000A5A 30C0                    	xor	al, al	    ; to do it an ASCIIZ string	
  1668 00000A5C AA                      	stosb
  1669                                  	;
  1670 00000A5D 5A                      	pop	edx
  1671 00000A5E 59                      	pop	ecx
  1672                                  	;
  1673 00000A5F B44F                    	mov	ah, 4Fh	; red (4) background, 
  1674                                  			; white (F) forecolor
  1675 00000A61 BE[B8010100]            	mov	esi, exc_msg ; message offset
  1676                                  	;
  1677                                  	; 20/01/2017 (!cpu exception!)
  1678                                  	;
  1679 00000A66 8105[6EFF0000]A000-             add    dword [scr_row], 0A0h
  1679 00000A6E 0000               
  1680 00000A70 8B3D[6EFF0000]                  mov    edi, [scr_row]
  1681                                  	;	
  1682 00000A76 C605[DB490100]00        	mov	byte [sysflg], 0  ; system mode
  1683 00000A7D FB                              sti
  1684                                  	;
  1685 00000A7E E8F8FBFFFF              	call 	printk
  1686                                  	;
  1687 00000A83 B410                    	mov	ah, 10h
  1688 00000A85 E87D010000              	call	int16h ; getc
  1689                                  	;
  1690 00000A8A B003                    	mov	al, 3
  1691 00000A8C E8C50A0000              	call	_set_mode
  1692                                  	;
  1693 00000A91 B801000000              	mov	eax, 1
  1694 00000A96 E91EB40000              	jmp	sysexit ; terminate process !!!
  1695                                  	
  1696                                  	; 22/01/2017
  1697                                  	; 18/04/2016
  1698                                  	; 28/08/2015
  1699                                  	; 23/02/2015
  1700                                  	; 20/08/2014
  1701                                  ignore_int:
  1702 00000A9B 50                      	push	eax
  1703 00000A9C 53                      	push	ebx ; 23/02/2015
  1704 00000A9D 56                      	push	esi
  1705 00000A9E 57                      	push	edi
  1706 00000A9F 1E                      	push 	ds
  1707 00000AA0 06                      	push 	es
  1708                                  	; 18/04/2016
  1709 00000AA1 66B81000                	mov	ax, KDATA
  1710 00000AA5 8ED8                    	mov	ds, ax
  1711 00000AA7 8EC0                    	mov	es, ax
  1712                                  	; 28/08/2015
  1713 00000AA9 0F20D8                  	mov	eax, cr3
  1714 00000AAC 50                      	push	eax ; (*) page directory
  1715                                  	;
  1716 00000AAD B467                    	mov	ah, 67h	; brown (6) background, 
  1717                                  			; light gray (7) forecolor
  1718 00000AAF BE[80000100]            	mov	esi, int_msg ; message offset
  1719                                  piemsg:
  1720                                          ; 27/08/2014
  1721 00000AB4 8105[6EFF0000]A000-             add     dword [scr_row], 0A0h
  1721 00000ABC 0000               
  1722 00000ABE 8B3D[6EFF0000]                  mov     edi, [scr_row]
  1723                                          ;
  1724 00000AC4 E8B2FBFFFF              	call 	printk
  1725                                  	;
  1726                                  	; 23/02/2015
  1727 00000AC9 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1728 00000ACB E6A0                    	out	0A0h, al ; the 2nd 8259
  1729                                  	; 22/08/2014
  1730 00000ACD B020                    	mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  1731 00000ACF E620                    	out	20h, al	; 8259 PORT
  1732                                  iiretp: 
  1733                                  	; 22/01/2017
  1734                                  	; 01/09/2015
  1735                                  	; 28/08/2015
  1736 00000AD1 58                      	pop	eax ; (*) page directory
  1737 00000AD2 0F22D8                  	mov	cr3, eax
  1738                                  iiret:
  1739 00000AD5 07                      	pop	es
  1740 00000AD6 1F                      	pop	ds
  1741 00000AD7 5F                      	pop	edi
  1742 00000AD8 5E                      	pop	esi
  1743 00000AD9 5B                      	pop	ebx ; 29/08/2014
  1744 00000ADA 58                      	pop 	eax
  1745 00000ADB CF                      	iretd
  1746                                  
  1747                                  	; 23/05/2016
  1748                                  	; 22/08/2014
  1749                                  	; IBM PC/AT BIOS source code ----- 10/06/85 (bios.asm)
  1750                                  	; (INT 1Ah)
  1751                                  	;; Linux (v0.12) source code (main.c) by Linus Torvalds (1991)
  1752                                  time_of_day:
  1753 00000ADC E831500000              	call	UPD_IPR			; WAIT TILL UPDATE NOT IN PROGRESS
  1754 00000AE1 726F                            jc      short time_of_day_retn ; 23/05/2016
  1755 00000AE3 B000                    	mov	al, CMOS_SECONDS
  1756 00000AE5 E843500000              	call	CMOS_READ
  1757 00000AEA A2[18340100]            	mov	[time_seconds], al 
  1758 00000AEF B002                    	mov	al, CMOS_MINUTES
  1759 00000AF1 E837500000              	call	CMOS_READ
  1760 00000AF6 A2[19340100]            	mov	[time_minutes], al 
  1761 00000AFB B004                    	mov	al, CMOS_HOURS
  1762 00000AFD E82B500000              	call	CMOS_READ
  1763 00000B02 A2[1A340100]                    mov     [time_hours], al
  1764 00000B07 B006                    	mov	al, CMOS_DAY_WEEK 
  1765 00000B09 E81F500000              	call	CMOS_READ
  1766 00000B0E A2[1B340100]            	mov	[date_wday], al
  1767 00000B13 B007                     	mov	al, CMOS_DAY_MONTH
  1768 00000B15 E813500000              	call	CMOS_READ
  1769 00000B1A A2[1C340100]            	mov	[date_day], al
  1770 00000B1F B008                    	mov	al, CMOS_MONTH
  1771 00000B21 E807500000              	call	CMOS_READ
  1772 00000B26 A2[1D340100]            	mov	[date_month], al
  1773 00000B2B B009                    	mov	al, CMOS_YEAR
  1774 00000B2D E8FB4F0000              	call	CMOS_READ
  1775 00000B32 A2[1E340100]            	mov	[date_year], al
  1776 00000B37 B032                    	mov	al, CMOS_CENTURY
  1777 00000B39 E8EF4F0000              	call	CMOS_READ
  1778 00000B3E A2[1F340100]            	mov	[date_century], al
  1779                                  	;
  1780 00000B43 B000                    	mov	al, CMOS_SECONDS
  1781 00000B45 E8E34F0000              	call 	CMOS_READ
  1782 00000B4A 3A05[18340100]          	cmp	al, [time_seconds]
  1783 00000B50 758A                    	jne	short time_of_day
  1784                                  
  1785                                  time_of_day_retn:
  1786 00000B52 C3                      	retn
  1787                                  
  1788                                  	; 15/01/2017
  1789                                  	; 10/06/2016
  1790                                  	; 07/06/2016
  1791                                  	; 06/06/2016
  1792                                  	; 23/05/2016
  1793                                  rtc_p:
  1794 00000B53 B101                    	mov	cl, 1 ; 15/01/2017
  1795 00000B55 EB02                    	jmp	short rtc_p0
  1796                                  u_timer: 
  1797                                  	; Timer Events with 18.2 Hz Timer Ticks
  1798                                  	; (and also timer events with RTC seconds)
  1799 00000B57 28C9                    	sub	cl, cl ; mov cl, 0 ; 15/01/2017
  1800                                  rtc_p0:
  1801                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1802                                  	; Major Modification:
  1803                                  	; Check and Perform Timer Events (for RTC)
  1804                                  	; 25/08/2014 - 07/09/2014
  1805                                  	; Retro UNIX 386 v1:
  1806                                   	; Print Real Time Clock content
  1807                                  	
  1808                                  	; 15/01/2017
  1809 00000B59 880D[3C410100]          	mov	byte [priority], cl ; 0 or 1 (not 2)
  1810 00000B5F 8A2D[3F410100]          	mov	ch, [timer_events]
  1811 00000B65 20ED                    	and	ch, ch
  1812 00000B67 7420                    	jz	short rtc_p3
  1813                                  
  1814 00000B69 BE[7C4A0100]            	mov	esi, timer_set  ; beginning address of
  1815                                  				; timer events space
  1816                                  rtc_p1:
  1817 00000B6E 8B06                    	mov	eax, [esi]	
  1818 00000B70 20C0                    	and	al, al ; 0 = free, >0 = process no.
  1819 00000B72 7416                    	jz	short rtc_p4
  1820                                  	;
  1821 00000B74 C1C810                  	ror	eax, 16
  1822                                  	; ah = response value, al = interrupt type
  1823                                  	; 15/01/2017
  1824                                  	; cl = interrupt source
  1825                                  	;       1 = RTC, 0 = PIT  	 	
  1826 00000B77 38C8                    	cmp	al, cl 
  1827 00000B79 750A                    	jne	short rtc_p2 ; not as requested or undefined !
  1828 00000B7B 3C01                    	cmp	al, 1 ; 1 ; RTC interrupt ?
  1829 00000B7D 7410                    	je	short rtc_p5 ; yes, check for response
  1830                                  	; 06/06/2016 - 18.2 Hz Timer Ticks
  1831 00000B7F 836E080A                	sub	dword [esi+8], 10 ; 1 tick = 10
  1832 00000B83 7613                    	jna	short rtc_p6  ; continue for responding
  1833                                  rtc_p2:
  1834                                  	; 15/01/2017 (cl -> ch)
  1835                                  	; 07/06/2016
  1836 00000B85 FECD                    	dec	ch    ; remain count of timer events	
  1837 00000B87 7501                    	jnz	short rtc_p4
  1838                                  rtc_p3:	 
  1839 00000B89 C3                      	retn
  1840                                  rtc_p4:	
  1841                                  	;cmp	esi, timer_set + 240 ; 15*16 (last event)
  1842                                  	;jnb	short rtc_p3 ; end of timer event space
  1843 00000B8A 83C610                  	add	esi, 16 ; next timer event
  1844 00000B8D EBDF                    	jmp	short rtc_p1
  1845                                  rtc_p5:	 
  1846                                  	; current timer count ; 06/06/2016 (182)
  1847 00000B8F 816E08B6000000          	sub	dword [esi+8], 182 ; 1 second (10*18.2)
  1848 00000B96 77ED                    	ja	short rtc_p2  ; check for the next 
  1849                                  rtc_p6:	
  1850                                  	; it is the time of response! 
  1851 00000B98 8B5E04                  	mov	ebx, [esi+4] ; set (count limit) value
  1852 00000B9B 895E08                  	mov	[esi+8], ebx ; reset count down value
  1853                                  			     ; to count limit
  1854                                  	; 19/12/2016
  1855                                  	; 10/12/2016 - timer callback modification
  1856 00000B9E 8B7E0C                  	mov	edi, [esi+12] ; response (or callback) address	
  1857 00000BA1 807E0100                	cmp	byte [esi+1], 0 ; >0 = callback
  1858 00000BA5 762A                    	jna	short rtc_p8
  1859                                  
  1860                                  	; timer callback !
  1861 00000BA7 0FB61E                  	movzx	ebx, byte [esi] ; process number (>0)
  1862 00000BAA 89D8                    	mov	eax, ebx
  1863 00000BAC C0E302                  	shl	bl, 2 ; *4
  1864 00000BAF 89BB[8C470100]          	mov	[ebx+p.tcb-4], edi ; user's callback service addr
  1865 00000BB5 3A05[334A0100]          	cmp	al, [u.uno]
  1866 00000BBB 7521                    	jne	short rtc_p9
  1867 00000BBD 893D[504A0100]          	mov	[u.tcb], edi
  1868                                  rtc_p7:
  1869                                  	; 15/01/2017
  1870 00000BC3 B002                    	mov	al, 2
  1871 00000BC5 A2[3C410100]            	mov	[priority], al ; 2
  1872                                  	; 10/01/2017
  1873                                  	;mov	byte [u.pri], 2
  1874 00000BCA A2[294A0100]            	mov	[u.pri], al ; 2
  1875 00000BCF EBB4                    	jmp	short rtc_p2
  1876                                  rtc_p8:
  1877                                  	; response address is physical address of
  1878                                  	; the program's response (signal return) byte
  1879                                  	; 06/06/2016
  1880                                  	;mov	edi, [esi+12] ; response address
  1881 00000BD1 8827                    	mov	[edi], ah     ; response value 
  1882                                  	;
  1883 00000BD3 C1C010                  	rol	eax, 16
  1884                                  	; 15/01/2017
  1885 00000BD6 3A05[334A0100]          	cmp	al, [u.uno] ; running process ?
  1886 00000BDC 74E5                    	je	short rtc_p7
  1887                                  rtc_p9:
  1888                                  	; al = process number  ; 10/06/2016
  1889 00000BDE B202                    	mov	dl, 2 ; priority, 2 = event (high)	
  1890 00000BE0 E8A7DE0000              	call	set_run_sequence ; 19/05/2016
  1891 00000BE5 EB9E                    	jmp	short rtc_p2 ; 10/06/2016
  1892                                  
  1893                                  
  1894                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  1895                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  1896                                  default_irq7:
  1897 00000BE7 6650                    	push	ax
  1898 00000BE9 B00B                    	mov	al, 0Bh  ; In-Service register
  1899 00000BEB E620                    	out	20h, al
  1900 00000BED EB00                            jmp short $+2
  1901 00000BEF EB00                    	jmp short $+2
  1902 00000BF1 E420                    	in	al, 20h
  1903 00000BF3 2480                    	and 	al, 80h ; bit 7 (is it real IRQ 7 or fake?)
  1904 00000BF5 7404                            jz      short irq7_iret ; Fake (spurious) IRQ, do not send EOI 
  1905 00000BF7 B020                            mov     al, 20h ; EOI
  1906 00000BF9 E620                    	out	20h, al 
  1907                                  irq7_iret:
  1908 00000BFB 6658                    	pop	ax
  1909 00000BFD CF                      	iretd
  1910                                  	
  1911                                  bcd_to_ascii:
  1912                                  	; 25/08/2014
  1913                                  	; INPUT ->
  1914                                  	;	al = Packed BCD number
  1915                                  	; OUTPUT ->
  1916                                  	;	ax  = ASCII word/number
  1917                                  	;
  1918                                  	; Erdogan Tan - 1998 (proc_hex) - TRDOS.ASM (2004-2011)
  1919                                  	;
  1920 00000BFE D410                    	db 0D4h,10h                     ; Undocumented inst. AAM
  1921                                  					; AH = AL / 10h
  1922                                  					; AL = AL MOD 10h
  1923 00000C00 660D3030                	or ax,'00'                      ; Make it ASCII based
  1924                                  
  1925 00000C04 86E0                            xchg ah, al 
  1926                                  	
  1927 00000C06 C3                      	retn	
  1928                                  	
  1929                                  
  1930                                  %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 00000C07 9C                  <1> 	pushfd	; 28/08/2014
    40 00000C08 0E                  <1> 	push 	cs
    41 00000C09 E801000000          <1> 	call 	KEYBOARD_IO_1 ; getc_int
    42 00000C0E 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 00000C0F 80642408BE          <1>         and     byte [esp+8], 10111110b ; clear zero flag and cary flag
   146                              <1> 	;
   147 00000C14 1E                  <1> 	push	ds			; SAVE CURRENT DS
   148 00000C15 53                  <1> 	push	ebx			; SAVE BX TEMPORARILY
   149                              <1> 	;push	ecx			; SAVE CX TEMPORARILY
   150 00000C16 66BB1000            <1>         mov     bx, KDATA 
   151 00000C1A 8EDB                <1> 	mov	ds, bx			; PUT SEGMENT VALUE OF DATA AREA INTO DS
   152                              <1> 
   153                              <1> 	; 14/01/2017
   154 00000C1C 8B1C24              <1> 	mov	ebx, [esp]
   155                              <1> 	;; 15/01/2017
   156                              <1> 	; 02/01/2017
   157                              <1> 	;;mov	byte [intflg], 32h	; keyboard interrupt 
   158 00000C1F FB                  <1> 	sti
   159                              <1> 	;
   160                              <1> 
   161 00000C20 08E4                <1> 	or	ah, ah			; CHECK FOR (AH)= 00H
   162 00000C22 743A                <1> 	jz	short _K1		; ASCII_READ
   163 00000C24 FECC                <1> 	dec	ah                      ; CHECK FOR (AH)= 01H
   164 00000C26 7453                <1>         jz      short _K2               ; ASCII_STATUS
   165 00000C28 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 02H
   166 00000C2A 0F8494000000        <1>         jz      _K3                     ; SHIFT STATUS
   167 00000C30 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 03H	
   168 00000C32 0F8493000000        <1>         jz      _K300                   ; SET TYPAMATIC RATE/DELAY
   169 00000C38 80EC02              <1> 	sub	ah, 2			; CHECK FOR (AH)= 05H	
   170 00000C3B 0F84BC000000        <1>         jz      _K500                   ; KEYBOARD WRITE         
   171                              <1> _KIO1:	
   172 00000C41 80EC0B              <1> 	sub	ah, 11			; AH =  10H
   173 00000C44 740C                <1> 	jz	short _K1E		; EXTENDED ASCII READ
   174 00000C46 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 11H
   175 00000C48 7422                <1> 	jz	short _K2E		; EXTENDED_ASCII_STATUS
   176 00000C4A FECC                <1> 	dec	ah			; CHECK FOR (AH)= 12H
   177 00000C4C 7458                <1> 	jz	short _K3E		; EXTENDED_SHIFT_STATUS
   178                              <1> _KIO_EXIT:
   179                              <1> 	; 02/01/2017
   180 00000C4E FA                  <1> 	cli
   181                              <1> 	;;mov	byte [intflg], 0 ;; 15/01/2017
   182                              <1> 	;
   183                              <1> 	;pop	ecx			; RECOVER REGISTER
   184 00000C4F 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   185 00000C50 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   186 00000C51 CF                  <1> 	iretd				; INVALID COMMAND, EXIT
   187                              <1> 
   188                              <1> 	;-----	ASCII CHARACTER
   189                              <1> _K1E:	
   190 00000C52 E8D3000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER (EXTENDED)
   191 00000C57 E848010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   192 00000C5C EBF0                <1> 	jmp	short _KIO_EXIT         ; GIVE IT TO THE CALLER
   193                              <1> _K1:	
   194 00000C5E E8C7000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER
   195 00000C63 E847010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   196 00000C68 72F4                <1> 	jc	short _K1		; CARRY SET MEANS TROW CODE AWAY
   197                              <1> _K1A:
   198 00000C6A EBE2                <1> 	jmp	short _KIO_EXIT         ; RETURN TO CALLER
   199                              <1> 
   200                              <1> 	;-----	ASCII STATUS
   201                              <1> _K2E:	
   202 00000C6C E804010000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER (EXTENDED)
   203 00000C71 7420                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   204 00000C73 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   205 00000C74 E82B010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   206 00000C79 EB17                <1> 	jmp	short _K2A	        ; GIVE IT TO THE CALLER
   207                              <1> _K2:	
   208 00000C7B E8F5000000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER
   209 00000C80 7411                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   210 00000C82 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   211 00000C83 E827010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   212 00000C88 7308                <1> 	jnc	short _K2A	        ; CARRY CLEAR MEANS PASS VALID CODE
   213 00000C8A 9D                  <1> 	popf				; INVALID CODE FOR THIS TYPE OF CALL
   214 00000C8B E89A000000          <1> 	call	_K1S			; THROW THE CHARACTER AWAY
   215 00000C90 EBE9                <1> 	jmp	short _K2		; GO LOOK FOR NEXT CHAR, IF ANY
   216                              <1> _K2A:
   217 00000C92 9D                  <1> 	popf				; RESTORE ZF FROM TEST
   218                              <1> _K2B:
   219                              <1> 	; 02/01/2017
   220 00000C93 FA                  <1> 	cli
   221                              <1> 	;; mov	byte [intflg], 0 ;; 15/01/2017
   222                              <1> 	;
   223                              <1> 	;pop	ecx			; RECOVER REGISTER
   224 00000C94 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   225 00000C95 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   226                              <1> 	; (*) 29/05/2016
   227                              <1> 	; (*) retf 4			; THROW AWAY (e)FLAGS
   228 00000C96 7208                <1> 	jc	short _k2d
   229 00000C98 7505                <1> 	jnz	short _k2c
   230 00000C9A 804C240840          <1> 	or	byte [esp+8], 01000000b	; set zero flag bit of eflags register
   231                              <1> _k2c:
   232 00000C9F 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 00000CA0 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 00000CA5 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 00000CA6 8A25[AEFB0000]      <1> 	mov	ah, [KB_FLAG_1]		; GET SYSTEM SHIFT KEY STATUS
   266 00000CAC 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 00000CAF C0E405              <1>         shl	ah, 5
   270 00000CB2 A0[AEFB0000]        <1> 	mov	al, [KB_FLAG_1]		; GET SYSTEM SHIFT STATES BACK
   271 00000CB7 2473                <1> 	and	al, 01110011b		; ELIMINATE SYS SHIFT, HOLD_STATE AND INS_SHIFT
   272 00000CB9 08C4                <1> 	or	ah, al                  ; MERGE REMAINING BITS INTO AH
   273 00000CBB A0[B0FB0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT CTL AND ALT
   274 00000CC0 240C                <1> 	and	al, 00001100b		; ELIMINATE LC_E0 AND LC_E1
   275 00000CC2 08C4                <1> 	or	ah, al			; OR THE SHIFT FLAGS TOGETHER
   276                              <1> _K3:
   277 00000CC4 A0[ADFB0000]        <1> 	mov	al, [KB_FLAG]		; GET THE SHIFT STATUS FLAGS
   278                              <1> 	;jmp	short _KIO_EXIT		; RETURN TO CALLER
   279 00000CC9 EB83                <1> 	jmp	_KIO_EXIT
   280                              <1> 
   281                              <1> 	;-----	SET TYPAMATIC RATE AND DELAY
   282                              <1> _K300:
   283 00000CCB 3C05                <1> 	cmp	al, 5			; CORRECT FUNCTION CALL?
   284                              <1> 	;jne	short _KIO_EXIT		; NO, RETURN
   285 00000CCD 0F857BFFFFFF        <1>      	jne	_KIO_EXIT
   286 00000CD3 F6C3E0              <1> 	test	bl, 0E0h		; TEST FOR OUT-OF-RANGE RATE
   287 00000CD6 0F8572FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   288 00000CDC F6C7FC              <1> 	test	BH, 0FCh		; TEST FOR OUT-OF-RANGE DELAY
   289 00000CDF 0F8569FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   290 00000CE5 B0F3                <1> 	mov	al, KB_TYPA_RD		; COMMAND FOR TYPAMATIC RATE/DELAY		
   291 00000CE7 E8DA060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   292                              <1> 	;mov	cx, 5			; SHIFT COUNT
   293                              <1> 	;shl	bh, cl			; SHIFT DELAY OVER
   294 00000CEC C0E705              <1> 	shl	bh, 5
   295 00000CEF 88D8                <1> 	mov	al, bl			; PUT IN RATE
   296 00000CF1 08F8                <1> 	or	al, bh			; AND DELAY
   297 00000CF3 E8CE060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   298 00000CF8 E951FFFFFF          <1>         jmp     _KIO_EXIT               ; RETURN TO CALLER
   299                              <1> 
   300                              <1> 	;-----	WRITE TO KEYBOARD BUFFER
   301                              <1> _K500:
   302 00000CFD 56                  <1> 	push	esi			; SAVE SI (esi)
   303 00000CFE FA                  <1> 	cli				; 
   304 00000CFF 8B1D[BEFB0000]      <1>      	mov	ebx, [BUFFER_TAIL]	; GET THE 'IN TO' POINTER TO THE BUFFER
   305 00000D05 89DE                <1> 	mov	esi, ebx		; SAVE A COPY IN CASE BUFFER NOT FULL
   306 00000D07 E8D3000000          <1> 	call	_K4			; BUMP THE POINTER TO SEE IF BUFFER IS FULL
   307 00000D0C 3B1D[BAFB0000]      <1> 	cmp	ebx, [BUFFER_HEAD]	; WILL THE BUFFER OVERRUN IF WE STORE THIS?
   308 00000D12 740D                <1> 	je	short _K502		; YES - INFORM CALLER OF ERROR		
   309 00000D14 66890E              <1> 	mov	[esi], cx		; NO - PUT ASCII/SCAN CODE INTO BUFFER	
   310 00000D17 891D[BEFB0000]      <1> 	mov	[BUFFER_TAIL], ebx	; ADJUST 'IN TO' POINTER TO REFLECT CHANGE
   311 00000D1D 28C0                <1> 	sub	al, al			; TELL CALLER THAT OPERATION WAS SUCCESSFUL
   312 00000D1F EB02                <1> 	jmp	short _K504		; SUB INSTRUCTION ALSO RESETS CARRY FLAG
   313                              <1> _K502:
   314 00000D21 B001                <1> 	mov	al, 01h			; BUFFER FULL INDICATION
   315                              <1> _K504:
   316 00000D23 FB                  <1> 	sti				
   317 00000D24 5E                  <1> 	pop	esi			; RECOVER SI (esi)
   318 00000D25 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 00000D2A FA                  <1> 	cli	; 03/12/2014
   323 00000D2B 8B1D[BAFB0000]      <1>         mov     ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   324 00000D31 3B1D[BEFB0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   325                              <1> 	;jne	short _K1U		; IF ANYTHING IN BUFFER SKIP INTERRUPT
   326 00000D37 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 00000D39 FB                  <1> 	sti				; INTERRUPTS BACK ON DURING LOOP
   335 00000D3A 90                  <1> 	nop				; ALLOW AN INTERRUPT TO OCCUR
   336                              <1> _K1U:	
   337 00000D3B FA                  <1> 	cli				; INTERRUPTS BACK OFF
   338 00000D3C 8B1D[BAFB0000]      <1>         mov    	ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   339 00000D42 3B1D[BEFB0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   340                              <1> _k1x:
   341 00000D48 53                  <1> 	push	ebx			; SAVE ADDRESS		
   342 00000D49 9C                  <1> 	pushf				; SAVE FLAGS
   343 00000D4A E82F070000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   344 00000D4F 8A1D[AFFB0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   345 00000D55 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   346 00000D57 80E307              <1> 	and	bl, 07h	; KB_LEDS	; ISOLATE INDICATOR BITS
   347 00000D5A 7406                <1> 	jz	short _K1V		; IF NO CHANGE BYPASS UPDATE
   348 00000D5C E8C9060000          <1> 	call	SND_LED1
   349 00000D61 FA                  <1> 	cli				; DISABLE INTERRUPTS
   350                              <1> _K1V:
   351 00000D62 9D                  <1> 	popf				; RESTORE FLAGS
   352 00000D63 5B                  <1> 	pop	ebx			; RESTORE ADDRESS
   353 00000D64 74D3                <1>         je      short _K1T              ; LOOP UNTIL SOMETHING IN BUFFER
   354                              <1> 	;
   355 00000D66 668B03              <1> 	mov	ax, [ebx] 		; GET SCAN CODE AND ASCII CODE
   356 00000D69 E871000000          <1>         call    _K4                     ; MOVE POINTER TO NEXT POSITION
   357 00000D6E 891D[BAFB0000]      <1>         mov     [BUFFER_HEAD], ebx      ; STORE VALUE IN VARIABLE
   358 00000D74 C3                  <1> 	retn				; RETURN
   359                              <1> 
   360                              <1> 	;-----	READ THE KEY TO SEE IF ONE IS PRESENT -----
   361                              <1> _K2S:
   362 00000D75 FA                  <1> 	cli				; INTERRUPTS OFF
   363 00000D76 8B1D[BAFB0000]      <1>         mov     ebx, [BUFFER_HEAD]      ; GET HEAD POINTER
   364 00000D7C 3B1D[BEFB0000]      <1>         cmp     ebx, [BUFFER_TAIL]      ; IF EQUAL (Z=1) THEN NOTHING THERE
   365 00000D82 668B03              <1> 	mov	ax, [ebx]
   366 00000D85 9C                  <1> 	pushf				; SAVE FLAGS
   367 00000D86 6650                <1> 	push	ax			; SAVE CODE
   368 00000D88 E8F1060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   369 00000D8D 8A1D[AFFB0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   370 00000D93 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   371 00000D95 80E307              <1> 	and	bl, 07h ; KB_LEDS	; ISOLATE INDICATOR BITS
   372 00000D98 7405                <1> 	jz	short _K2T		; IF NO CHANGE BYPASS UPDATE
   373 00000D9A E874060000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   374                              <1> _K2T:
   375 00000D9F 6658                <1> 	pop	ax			; RESTORE CODE
   376 00000DA1 9D                  <1> 	popf				; RESTORE FLAGS
   377 00000DA2 FB                  <1> 	sti				; INTERRUPTS BACK ON
   378 00000DA3 C3                  <1> 	retn				; RETURN
   379                              <1> 
   380                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR EXTENDED CALLS -----
   381                              <1> _KIO_E_XLAT:
   382 00000DA4 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   383 00000DA6 7506                <1> 	jne	short _KIO_E_RET	; NO, PASS IT ON
   384 00000DA8 08E4                <1>         or 	ah, ah			; AH = 0 IS SPECIAL CASE
   385 00000DAA 7402                <1>         jz	short _KIO_E_RET        ; PASS THIS ON UNCHANGED
   386 00000DAC 30C0                <1> 	xor	al, al			; OTHERWISE SET AL = 0
   387                              <1> _KIO_E_RET:				
   388 00000DAE C3                  <1> 	retn				; GO BACK
   389                              <1> 
   390                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR STANDARD CALLS -----
   391                              <1> _KIO_S_XLAT:
   392 00000DAF 80FCE0              <1> 	cmp	ah, 0E0h		; IS IT KEYPAD ENTER OR / ?
   393 00000DB2 750F                <1> 	jne	short _KIO_S2		; NO, CONTINUE
   394 00000DB4 3C0D                <1> 	cmp	al, 0Dh			; KEYPAD ENTER CODE?
   395 00000DB6 7408                <1>         je	short _KIO_S1		; YES, MASSAGE A BIT
   396 00000DB8 3C0A                <1> 	cmp	al, 0Ah			; CTRL KEYPAD ENTER CODE?
   397 00000DBA 7404                <1>         je	short _KIO_S1		; YES, MASSAGE THE SAME
   398 00000DBC B435                <1> 	mov	ah, 35h			; NO, MUST BE KEYPAD /
   399                              <1> _kio_ret: ; 03/12/2014
   400 00000DBE F8                  <1> 	clc
   401 00000DBF C3                  <1> 	retn
   402                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   403                              <1> _KIO_S1:				
   404 00000DC0 B41C                <1> 	mov	ah, 1Ch			; CONVERT TO COMPATIBLE OUTPUT
   405                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   406 00000DC2 C3                  <1> 	retn
   407                              <1> _KIO_S2:		
   408 00000DC3 80FC84              <1> 	cmp	ah, 84h			; IS IT ONE OF EXTENDED ONES?
   409 00000DC6 7715                <1> 	ja	short _KIO_DIS		; YES, THROW AWAY AND GET ANOTHER CHAR
   410 00000DC8 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   411 00000DCA 7506                <1>         jne	short _KIO_S3		; NO, TRY LAST TEST
   412 00000DCC 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   413 00000DCE 740C                <1>         jz	short _KIO_USE		; PASS THIS ON UNCHANGED
   414 00000DD0 EB0B                <1> 	jmp	short _KIO_DIS		; THROW AWAY THE REST
   415                              <1> _KIO_S3:
   416 00000DD2 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 00000DD4 75E8                <1> 	jne	short _kio_ret
   419 00000DD6 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   420 00000DD8 7402                <1>         jz	short _KIO_USE		; JUMP IF AH = 0
   421 00000DDA 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 00000DDC C3                  <1> 	retn				; RETURN	
   426                              <1> _KIO_DIS:
   427 00000DDD F9                  <1> 	stc				; SET CARRY TO INDICATE DISCARD CODE
   428 00000DDE C3                  <1> 	retn				; RETURN
   429                              <1> 
   430                              <1> 	;-----	INCREMENT BUFFER POINTER ROUTINE -----
   431                              <1> _K4:    
   432 00000DDF 43                  <1> 	inc     ebx
   433 00000DE0 43                  <1> 	inc	ebx			; MOVE TO NEXT WORD IN LIST
   434 00000DE1 3B1D[B6FB0000]      <1>         cmp     ebx, [BUFFER_END] 	; AT END OF BUFFER?
   435                              <1>         ;jne    short _K5               ; NO, CONTINUE
   436 00000DE7 7206                <1> 	jb	short _K5
   437 00000DE9 8B1D[B2FB0000]      <1>         mov     ebx, [BUFFER_START]     ; YES, RESET TO BUFFER BEGINNING
   438                              <1> _K5:
   439 00000DEF 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 00000DF0 FB                  <1> 	sti				; ENABLE INTERRUPTS
   549                              <1> 	;push	ebp
   550 00000DF1 50                  <1> 	push	eax
   551 00000DF2 53                  <1> 	push	ebx
   552 00000DF3 51                  <1> 	push	ecx
   553 00000DF4 52                  <1> 	push	edx
   554 00000DF5 56                  <1> 	push	esi
   555 00000DF6 57                  <1> 	push	edi
   556 00000DF7 1E                  <1> 	push	ds
   557 00000DF8 06                  <1> 	push	es
   558 00000DF9 FC                  <1> 	cld				; FORWARD DIRECTION
   559 00000DFA 66B81000            <1> 	mov	ax, KDATA
   560 00000DFE 8ED8                <1> 	mov	ds, ax
   561 00000E00 8EC0                <1> 	mov	es, ax
   562                              <1> 	;
   563                              <1> 	;-----	WAIT FOR KEYBOARD DISABLE COMMAND TO BE ACCEPTED
   564 00000E02 B0AD                <1> 	mov	al, DIS_KBD		; DISABLE THE KEYBOARD COMMAND
   565 00000E04 E8A9050000          <1> 	call	SHIP_IT			; EXECUTE DISABLE
   566 00000E09 FA                  <1> 	cli				; DISABLE INTERRUPTS
   567 00000E0A B900000100          <1> 	mov	ecx, 10000h		; SET MAXIMUM TIMEOUT
   568                              <1> KB_INT_01:
   569 00000E0F E464                <1> 	in	al, STATUS_PORT		; READ ADAPTER STATUS
   570 00000E11 A802                <1> 	test	al, INPT_BUF_FULL	; CHECK INPUT BUFFER FULL STATUS BIT
   571 00000E13 E0FA                <1> 	loopnz	KB_INT_01		; WAIT FOR COMMAND TO BE ACCEPTED
   572                              <1> 	;
   573                              <1> 	;-----	READ CHARACTER FROM KEYBOARD INTERFACE
   574 00000E15 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 00000E17 FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
   588 00000E18 3CFE                <1> 	cmp	al, KB_RESEND		; IS THE INPUT A RESEND
   589 00000E1A 7411                <1>         je      short KB_INT_4          ; GO IF RESEND
   590                              <1> 	;
   591                              <1> 	;-----	CHECK FOR RESPONSE TO A COMMAND TO KEYBOARD
   592 00000E1C 3CFA                <1> 	cmp	al, KB_ACK		; IS THE INPUT AN ACKNOWLEDGE
   593 00000E1E 751A                <1>         jne     short KB_INT_2          ; GO IF NOT
   594                              <1> 	;
   595                              <1> 	;-----	A COMMAND TO THE KEYBOARD WAS ISSUED
   596 00000E20 FA                  <1> 	cli				; DISABLE INTERRUPTS
   597 00000E21 800D[AFFB0000]10    <1> 	or	byte [KB_FLAG_2], KB_FA ; INDICATE ACK RECEIVED
   598 00000E28 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 00000E2D FA                  <1> 	cli				; DISABLE INTERRUPTS
   603 00000E2E 800D[AFFB0000]20    <1> 	or	byte [KB_FLAG_2], KB_FE ; INDICATE RESEND RECEIVED
   604 00000E35 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 00000E3A 6650                <1> 	push 	ax			; SAVE DATA IN
   609 00000E3C E83D060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   610 00000E41 8A1D[AFFB0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   611 00000E47 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   612 00000E49 80E307              <1> 	and	bl, KB_LEDS		; ISOLATE INDICATOR BITS
   613 00000E4C 7405                <1> 	jz	short UP0		; IF NO CHANGE BYPASS UPDATE
   614 00000E4E E8C0050000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   615                              <1> UP0:
   616 00000E53 6658                <1> 	pop	ax			; RESTORE DATA IN
   617                              <1> ;------------------------------------------------------------------------
   618                              <1> ;	START OF KEY PROCESSING						;
   619                              <1> ;------------------------------------------------------------------------
   620 00000E55 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE IN AH ALSO
   621                              <1> 	;
   622                              <1> 	;-----	TEST FOR OVERRUN SCAN CODE FROM KEYBOARD
   623 00000E57 3CFF                <1> 	cmp	al, KB_OVER_RUN		; IS THIS AN OVERRUN CHAR
   624 00000E59 0F843F050000        <1>         je      K62			; BUFFER_FULL_BEEP
   625                              <1> 	;
   626                              <1> K16:	
   627 00000E5F 8A3D[B0FB0000]      <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 00000E65 F6C7C0              <1> 	test 	bh, RD_ID+LC_AB 	; ARE WE DOING A READ ID?
   631 00000E68 7449                <1> 	jz	short NOT_ID		; CONTINUE IF NOT
   632 00000E6A 7917                <1> 	jns	short TST_ID_2		; IS THE RD_ID FLAG ON?
   633 00000E6C 3CAB                <1> 	cmp	al, ID_1		; IS THIS THE 1ST ID CHARACTER?
   634 00000E6E 7507                <1> 	jne	short RST_RD_ID
   635 00000E70 800D[B0FB0000]40    <1> 	or	byte [KB_FLAG_3], LC_AB ; INDICATE 1ST ID WAS OK
   636                              <1> RST_RD_ID:
   637 00000E77 8025[B0FB0000]7F    <1> 	and	byte [KB_FLAG_3], ~RD_ID ; RESET THE READ ID FLAG
   638                              <1>         ;jmp    short ID_EX		; AND EXIT
   639 00000E7E E924020000          <1> 	jmp	K26
   640                              <1> 	;
   641                              <1> TST_ID_2:
   642 00000E83 8025[B0FB0000]BF    <1> 	and	byte [KB_FLAG_3], ~LC_AB ; RESET FLAG
   643 00000E8A 3C54                <1> 	cmp	al, ID_2A		; IS THIS THE 2ND ID CHARACTER?
   644 00000E8C 7419                <1>         je	short KX_BIT		; JUMP IF SO
   645 00000E8E 3C41                <1> 	cmp	al, ID_2		; IS THIS THE 2ND ID CHARACTER?
   646                              <1>         ;jne	short ID_EX		; LEAVE IF NOT
   647 00000E90 0F8511020000        <1> 	jne	K26
   648                              <1> 	;
   649                              <1> 	;-----	A READ ID SAID THAT IT WAS ENHANCED KEYBOARD
   650 00000E96 F6C720              <1> 	test	bh, SET_NUM_LK 		; SHOULD WE SET NUM LOCK?
   651 00000E99 740C                <1>         jz      short KX_BIT		; EXIT IF NOT
   652 00000E9B 800D[ADFB0000]20    <1> 	or	byte [KB_FLAG], NUM_STATE ; FORCE NUM LOCK ON
   653 00000EA2 E86C050000          <1> 	call	SND_LED			; GO SET THE NUM LOCK INDICATOR
   654                              <1> KX_BIT:
   655 00000EA7 800D[B0FB0000]10    <1> 	or	byte [KB_FLAG_3], KBX	; INDICATE ENHANCED KEYBOARD WAS FOUND
   656 00000EAE E9F4010000          <1> ID_EX:	jmp     K26			; EXIT
   657                              <1> 	;
   658                              <1> NOT_ID:
   659 00000EB3 3CE0                <1> 	cmp	al, MC_E0		; IS THIS THE GENERAL MARKER CODE?
   660 00000EB5 750C                <1> 	jne	short TEST_E1
   661 00000EB7 800D[B0FB0000]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 00000EBE E9EB010000          <1> 	jmp	K26A	
   664                              <1> TEST_E1:	
   665 00000EC3 3CE1                <1> 	cmp	al, MC_E1		; IS THIS THE PAUSE KEY?
   666 00000EC5 750C                <1> 	jne	short NOT_HC
   667 00000EC7 800D[B0FB0000]11    <1> 	or	byte [KB_FLAG_3], LC_E1+KBX ; SET FLAG BIT, SET KBX, AND
   668 00000ECE E9DB010000          <1> EXIT:	jmp	K26A			; THROW AWAY THIS CODE
   669                              <1> 	;
   670                              <1> NOT_HC:
   671 00000ED3 247F                <1> 	and	al, 07Fh		; TURN OFF THE BREAK BIT
   672 00000ED5 F6C702              <1> 	test	bh, LC_E0		; LAST CODE THE E0 MARKER CODE
   673 00000ED8 7414                <1> 	jz	short NOT_LC_E0		; JUMP IF NOT
   674                              <1> 	;
   675 00000EDA BF[9AFA0000]        <1> 	mov	edi, _K6+6		; IS THIS A SHIFT KEY?
   676 00000EDF AE                  <1> 	scasb
   677 00000EE0 0F84C1010000        <1>         je      K26 ; K16B              ; YES, THROW AWAY & RESET FLAG
   678 00000EE6 AE                  <1> 	scasb
   679 00000EE7 757C                <1> 	jne	short K16A		; NO, CONTINUE KEY PROCESSING
   680                              <1> 	;jmp	short K16B		; YES, THROW AWAY & RESET FLAG
   681 00000EE9 E9B9010000          <1> 	jmp	K26
   682                              <1> 	;
   683                              <1> NOT_LC_E0:
   684 00000EEE F6C701              <1> 	test	bh, LC_E1		; LAST CODE THE E1 MARKER CODE?
   685 00000EF1 7435                <1> 	jz	short T_SYS_KEY		; JUMP IF NOT
   686 00000EF3 B904000000          <1> 	mov	ecx, 4			; LENGHT OF SEARCH
   687 00000EF8 BF[98FA0000]        <1> 	mov	edi, _K6+4		; IS THIS AN ALT, CTL, OR SHIFT?
   688 00000EFD F2AE                <1> 	repne	scasb			; CHECK IT
   689                              <1> 	;je	short EXIT		; THROW AWAY IF SO
   690 00000EFF 0F84A9010000        <1> 	je	K26A			
   691                              <1> 	;
   692 00000F05 3C45                <1> 	cmp	al, NUM_KEY		; IS IT THE PAUSE KEY?
   693                              <1> 	;jne	short K16B		; NO, THROW AWAY & RESET FLAG
   694 00000F07 0F859A010000        <1> 	jne	K26
   695 00000F0D F6C480              <1> 	test	ah, 80h			; YES, IS IT THE BREAK OF THE KEY?
   696                              <1> 	;jnz	short K16B		; YES, THROW THIS AWAY, TOO	
   697 00000F10 0F8591010000        <1> 	jnz	K26
   698                              <1>         ; 20/02/2015 
   699 00000F16 F605[AEFB0000]08    <1> 	test	byte [KB_FLAG_1],HOLD_STATE ;  NO, ARE WE PAUSED ALREADY?
   700                              <1> 	;jnz	short K16B		;  YES, THROW AWAY
   701 00000F1D 0F8584010000        <1> 	jnz	K26
   702 00000F23 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 00000F28 3C54                <1> 	cmp	al, SYS_KEY		; IS IT THE SYSTEM KEY?
   707 00000F2A 7539                <1> 	jnz	short K16A		; CONTINUE IF NOT
   708                              <1> 	;
   709 00000F2C F6C480              <1> 	test	ah, 80h			; CHECK IF THIS A BREAK CODE
   710 00000F2F 7524                <1> 	jnz	short K16C		; DO NOT TOUCH SYSTEM INDICATOR IF TRUE
   711                              <1> 	;
   712 00000F31 F605[AEFB0000]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 00000F38 0F8569010000        <1> 	jnz     K26			
   715                              <1> 	;
   716 00000F3E 800D[AEFB0000]04    <1> 	or	byte [KB_FLAG_1], SYS_SHIFT ; INDICATE SYSTEM KEY DEPRESSED
   717 00000F45 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   718 00000F47 E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   719                              <1> 					; INTERRUPT-RETURN-NO-EOI
   720 00000F49 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   721 00000F4B 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 00000F50 E965010000          <1>         jmp     K27A                    ; END PROCESSING
   727                              <1> 	;
   728                              <1> ;K16B:	jmp	K26			; IGNORE SYSTEM KEY
   729                              <1> 	;
   730                              <1> K16C:
   731 00000F55 8025[AEFB0000]FB    <1> 	and	byte [KB_FLAG_1], ~SYS_SHIFT ; TURN OFF SHIFT KEY HELD DOWN
   732 00000F5C B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   733 00000F5E 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 00000F60 E94E010000          <1> 	jmp     K27			; IGNORE SYSTEM KEY
   744                              <1> 	;
   745                              <1> 	;-----	TEST FOR SHIFT KEYS
   746                              <1> K16A:
   747 00000F65 8A1D[ADFB0000]      <1> 	mov	bl, [KB_FLAG]		; PUT STATE FLAGS IN BL
   748 00000F6B BF[94FA0000]        <1> 	mov	edi, _K6		; SHIFT KEY TABLE offset
   749 00000F70 B908000000          <1> 	mov	ecx, _K6L		; LENGTH
   750 00000F75 F2AE                <1> 	repne	scasb			; LOOK THROUGH THE TABLE FOR A MATCH
   751 00000F77 88E0                <1> 	mov	al, ah			; RECOVER SCAN CODE
   752 00000F79 0F8510010000        <1>         jne     K25                     ; IF NO MATCH, THEN SHIFT NOT FOUND
   753                              <1> 	;
   754                              <1> 	;------	SHIFT KEY FOUND
   755                              <1> K17:
   756 00000F7F 81EF[95FA0000]      <1>         sub     edi, _K6+1              ; ADJUST PTR TO SCAN CODE MATCH
   757 00000F85 8AA7[9CFA0000]      <1>        	mov     ah, [edi+_K7]       	; GET MASK INTO AH
   758 00000F8B B102                <1> 	mov	cl, 2			; SETUP COUNT FOR FLAG SHIFTS
   759 00000F8D A880                <1> 	test	al, 80h			; TEST FOR BREAK KEY
   760 00000F8F 0F8596000000        <1>         jnz     K23                     ; JUMP OF BREAK
   761                              <1> 	;
   762                              <1> 	;-----	SHIFT MAKE FOUND, DETERMINE SET OR TOGGLE
   763                              <1> K17C:
   764 00000F95 80FC10              <1> 	cmp	ah, SCROLL_SHIFT
   765 00000F98 732B                <1> 	jae	short K18		; IF SCROLL SHIFT OR ABOVE, TOGGLE KEY
   766                              <1> 	;
   767                              <1> 	;-----	PLAIN SHIFT KEY, SET SHIFT ON
   768 00000F9A 0825[ADFB0000]      <1> 	or	[KB_FLAG], ah		; TURN ON SHIFT BIT
   769 00000FA0 A80C                <1>         test	al, CTL_SHIFT+ALT_SHIFT ; IS IT ALT OR CTRL?
   770                              <1> 	;jnz	short K17D		; YES, MORE FLAGS TO SET
   771 00000FA2 0F84FF000000        <1> 	jz	K26			; NO, INTERRUPT RETURN
   772                              <1> K17D:
   773 00000FA8 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF NEW KEYS?
   774 00000FAB 740B                <1> 	jz 	short K17E		; NO, JUMP
   775 00000FAD 0825[B0FB0000]      <1> 	or	[KB_FLAG_3], ah		; SET BITS FOR RIGHT CTRL, ALT
   776 00000FB3 E9EF000000          <1> 	jmp	K26			; INTERRUPT RETURN
   777                              <1> K17E:
   778 00000FB8 D2EC                <1> 	shr	ah, cl			; MOVE FLAG BITS TWO POSITIONS
   779 00000FBA 0825[AEFB0000]      <1> 	or	[KB_FLAG_1], ah		; SET BITS FOR LEFT CTRL, ALT
   780 00000FC0 E9E2000000          <1> 	jmp	K26
   781                              <1> 	;
   782                              <1> 	;-----	TOGGLED SHIFT KEY, TEST FOR 1ST MAKE OR NOT
   783                              <1> K18:					; SHIFT-TOGGLE
   784 00000FC5 F6C304              <1> 	test	bl, CTL_SHIFT 		; CHECK CTL SHIFT STATE
   785                              <1>         ;jz    	short K18A              ; JUMP IF NOT CTL STATE
   786 00000FC8 0F85C1000000        <1>         jnz     K25                     ; JUMP IF CTL STATE
   787                              <1> K18A:
   788 00000FCE 3C52                <1> 	cmp	al, INS_KEY		; CHECK FOR INSERT KEY
   789 00000FD0 7524                <1> 	jne	short K22		; JUMP IF NOT INSERT KEY
   790 00000FD2 F6C308              <1> 	test	bl, ALT_SHIFT 		; CHECK FOR ALTERNATE SHIFT
   791                              <1>       	;jz	short K18B		; JUMP IF NOT ALTERNATE SHIFT	
   792 00000FD5 0F85B4000000        <1>         jnz     K25                     ; JUMP IF ALTERNATE SHIFT
   793                              <1> K18B:
   794 00000FDB F6C702              <1> 	test	bh, LC_E0 ;20/02/2015	; IS THIS NEW INSERT KEY?
   795 00000FDE 7516                <1> 	jnz	short K22		; YES, THIS ONE'S NEVER A '0'
   796                              <1> K19:	
   797 00000FE0 F6C320              <1> 	test	bl, NUM_STATE 		; CHECK FOR BASE STATE
   798 00000FE3 750C                <1> 	jnz	short K21		; JUMP IF NUM LOCK IS ON
   799 00000FE5 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST FOR SHIFT STATE
   800 00000FE8 740C                <1> 	jz	short K22		; JUMP IF BASE STATE
   801                              <1> K20:					; NUMERIC ZERO, NOT INSERT KEY
   802 00000FEA 88C4                <1> 	mov	ah, al			; PUT SCAN CODE BACK IN AH
   803 00000FEC E99E000000          <1>         jmp     K25                     ; NUMERAL '0', STNDRD. PROCESSING
   804                              <1> K21:					; MIGHT BE NUMERIC
   805 00000FF1 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT
   806 00000FF4 74F4                <1> 	jz	short K20		; IS NUMERIC, STD. PROC.
   807                              <1> 	;
   808                              <1> K22:					; SHIFT TOGGLE KEY HIT; PROCESS IT
   809 00000FF6 8425[AEFB0000]      <1> 	test	ah, [KB_FLAG_1] 	; IS KEY ALREADY DEPRESSED
   810 00000FFC 0F85A5000000        <1>         jnz     K26                     ; JUMP IF KEY ALREADY DEPRESSED
   811                              <1> K22A:
   812 00001002 0825[AEFB0000]      <1>         or      [KB_FLAG_1], ah 	; INDICATE THAT THE KEY IS DEPRESSED
   813 00001008 3025[ADFB0000]      <1> 	xor	[KB_FLAG], ah		; TOGGLE THE SHIFT STATE
   814                              <1> 	;
   815                              <1> 	;-----	TOGGLE LED IF CAPS, NUM  OR SCROLL KEY DEPRESSED
   816 0000100E F6C470              <1> 	test	ah, CAPS_SHIFT+NUM_SHIFT+SCROLL_SHIFT ; SHIFT TOGGLE?
   817 00001011 7409                <1> 	jz	short K22B		; GO IF NOT
   818                              <1> 	;
   819 00001013 6650                <1> 	push	ax			; SAVE SCAN CODE AND SHIFT MASK
   820 00001015 E8F9030000          <1> 	call	SND_LED			; GO TURN MODE INDICATORS ON
   821 0000101A 6658                <1> 	pop	ax			; RESTORE SCAN CODE
   822                              <1> K22B:
   823 0000101C 3C52                <1> 	cmp	al, INS_KEY		; TEST FOR 1ST MAKE OF INSERT KEY
   824 0000101E 0F8583000000        <1>         jne     K26                     ; JUMP IF NOT INSERT KEY
   825 00001024 88C4                <1> 	mov	ah, al		        ; SCAN CODE IN BOTH HALVES OF AX
   826 00001026 E999000000          <1>         jmp     K28                     ; FLAGS UPDATED, PROC. FOR BUFFER
   827                              <1> 	;
   828                              <1> 	;-----	BREAK SHIFT FOUND
   829                              <1> K23:					; BREAK-SHIFT-FOUND
   830 0000102B 80FC10              <1> 	cmp	ah, SCROLL_SHIFT	; IS THIS A TOGGLE KEY
   831 0000102E F6D4                <1> 	not	ah			; INVERT MASK
   832 00001030 7355                <1> 	jae	short K24		; YES, HANDLE BREAK TOGGLE
   833 00001032 2025[ADFB0000]      <1> 	and	[KB_FLAG], ah		; TURN OFF SHIFT BIT
   834 00001038 80FCFB              <1> 	cmp	ah, ~CTL_SHIFT		; IS THIS ALT OR CTL?
   835 0000103B 7730                <1> 	ja	short K23D		; NO, ALL DONE
   836                              <1> 	;
   837 0000103D F6C702              <1> 	test	bh, LC_E0		; 2ND ALT OR CTL?
   838 00001040 7408                <1> 	jz	short K23A		; NO, HANSLE NORMALLY
   839 00001042 2025[B0FB0000]      <1> 	and 	[KB_FLAG_3], ah		; RESET BIT FOR RIGHT ALT OR CTL
   840 00001048 EB08                <1> 	jmp	short K23B		; CONTINUE
   841                              <1> K23A:
   842 0000104A D2FC                <1> 	sar	ah, cl			; MOVE THE MASK BIT TWO POSITIONS
   843 0000104C 2025[AEFB0000]      <1> 	and	[KB_FLAG_1], ah		; RESET BIT FOR LEFT ALT AND CTL
   844                              <1> K23B:
   845 00001052 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE
   846 00001054 A0[B0FB0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT ALT & CTRL FLAGS
   847 00001059 D2E8                <1> 	shr	al, cl			; MOVE TO BITS 1 & 0
   848 0000105B 0A05[AEFB0000]      <1> 	or	al, [KB_FLAG_1]		; PUT IN LEFT ALT & CTL FLAGS
   849 00001061 D2E0                <1> 	shl	al, cl			; MOVE BACK TO BITS 3 & 2
   850 00001063 240C                <1> 	and	al, ALT_SHIFT+CTL_SHIFT ; FILTER OUT OTHER GARBAGE
   851 00001065 0805[ADFB0000]      <1> 	or	[KB_FLAG], al		; PUT RESULT IN THE REAL FLAGS	
   852 0000106B 88E0                <1> 	mov	al, ah
   853                              <1> K23D:
   854 0000106D 3CB8                <1> 	cmp	al, ALT_KEY+80h		; IS THIS ALTERNATE SHIFT RELEASE
   855 0000106F 7536                <1> 	jne	short K26		; INTERRUPT RETURN
   856                              <1> 	;	
   857                              <1> 	;-----	ALTERNATE SHIFT KEY RELEASED, GET THE VALUE INTO BUFFER
   858 00001071 A0[B1FB0000]        <1> 	mov	al, [ALT_INPUT]
   859 00001076 B400                <1> 	mov	ah, 0			; SCAN CODE OF 0
   860 00001078 8825[B1FB0000]      <1> 	mov	[ALT_INPUT], ah 	; ZERO OUT THE FIELD
   861 0000107E 3C00                <1> 	cmp	al, 0			; WAS THE INPUT = 0?
   862 00001080 7425                <1> 	je	short K26		; INTERRUPT_RETURN
   863                              <1>         ; 29/01/2016
   864                              <1> 	;jmp     K61                    ; IT WASN'T, SO PUT IN BUFFER
   865 00001082 E9D0020000          <1> 	jmp	_K60
   866                              <1> 	;
   867                              <1> K24:					; BREAK-TOGGLE
   868 00001087 2025[AEFB0000]      <1> 	and	[KB_FLAG_1], ah 	; INDICATE NO LONGER DEPRESSED
   869 0000108D 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 0000108F 3C80                <1> 	cmp	al, 80h			; TEST FOR BREAK KEY
   875 00001091 7314                <1> 	jae	short K26		; NOTHING FOR BREAK CHARS FROM HERE ON
   876 00001093 F605[AEFB0000]08    <1> 	test	byte [KB_FLAG_1], HOLD_STATE ; ARE WE IN HOLD STATE
   877 0000109A 7428                <1> 	jz	short K28		; BRANCH AROUND TEST IF NOT
   878 0000109C 3C45                <1> 	cmp	al, NUM_KEY
   879 0000109E 7407                <1> 	je	short K26		; CAN'T END HOLD ON NUM_LOCK
   880 000010A0 8025[AEFB0000]F7    <1> 	and	byte [KB_FLAG_1], ~HOLD_STATE ; TURN OFF THE HOLD STATE BIT
   881                              <1> 	;
   882                              <1> K26:
   883 000010A7 8025[B0FB0000]FC    <1> 	and	byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; RESET LAST CHAR H.C. FLAG
   884                              <1> K26A:					; INTERRUPT-RETURN
   885 000010AE FA                  <1> 	cli				; TURN OFF INTERRUPTS
   886 000010AF B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   887 000010B1 E620                <1> 	out	20h, al	;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   888                              <1> K27:					; INTERRUPT-RETURN-NO-EOI
   889 000010B3 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   890 000010B5 E8F8020000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
   891                              <1> K27A:
   892 000010BA FA                  <1> 	cli				; DISABLE INTERRUPTS
   893                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017 ;; 15/01/2017
   894 000010BB 07                  <1> 	pop	es			; RESTORE REGISTERS
   895 000010BC 1F                  <1> 	pop	ds
   896 000010BD 5F                  <1> 	pop	edi
   897 000010BE 5E                  <1> 	pop	esi
   898 000010BF 5A                  <1> 	pop	edx
   899 000010C0 59                  <1> 	pop	ecx
   900 000010C1 5B                  <1> 	pop	ebx
   901 000010C2 58                  <1> 	pop	eax
   902                              <1> 	;pop	ebp
   903 000010C3 CF                  <1> 	iretd				; RETURN
   904                              <1> 
   905                              <1> 	;-----	NOT IN	HOLD STATE
   906                              <1> K28:					; NO-HOLD-STATE
   907 000010C4 3C58                <1> 	cmp	al, 88			; TEST FOR OUT-OF-RANGE SCAN CODES
   908 000010C6 77DF                <1> 	ja	short K26		; IGNORE IF OUT-OF-RANGE	
   909                              <1> 	;
   910 000010C8 F6C308              <1> 	test	bl, ALT_SHIFT 		; ARE WE IN ALTERNATE SHIFT
   911                              <1>         ;jz	short K28A		; IF NOT ALTERNATE
   912 000010CB 0F84F1000000        <1>         jz      K38
   913                              <1> 	;
   914 000010D1 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENCHANCED KEYBOARD?
   915 000010D4 740D                <1> 	jz	short K29		; NO, ALT STATE IS REAL
   916                              <1> 	 ;28/02/2015
   917 000010D6 F605[AEFB0000]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 000010DD 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 000010E3 F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT ALSO?
   926 000010E6 740B                <1> 	jz	short K31		; NO_RESET
   927 000010E8 3C53                <1> 	cmp	al, DEL_KEY		; CTL-ALT STATE, TEST FOR DELETE KEY
   928 000010EA 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 000010EC B0FE                <1> 	mov	al, SHUT_CMD		; SHUTDOWN COMMAND
   936 000010EE E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROL PORT
   937                              <1> khere:
   938 000010F0 F4                  <1> 	hlt				; WAIT FOR 80286 RESET
   939 000010F1 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 000010F3 3C39                <1> 	cmp	al, 57			; TEST FOR SPACE KEY
   945 000010F5 7507                <1> 	jne	short K311		; NOT THERE
   946 000010F7 B020                <1> 	mov	al, ' '			; SET SPACE CHAR
   947 000010F9 E948020000          <1>         jmp     K57                     ; BUFFER_FILL
   948                              <1> K311:
   949 000010FE 3C0F                <1> 	cmp	al, 15			; TEST FOR TAB KEY
   950 00001100 7509                <1> 	jne	short K312		; NOT THERE
   951 00001102 66B800A5            <1> 	mov	ax, 0A500h		; SET SPECIAL CODE FOR ALT-TAB
   952 00001106 E93B020000          <1>         jmp     K57                     ; BUFFER_FILL
   953                              <1> K312:
   954 0000110B 3C4A                <1> 	cmp	al, 74			; TEST FOR KEY PAD -
   955 0000110D 0F84A2000000        <1>         je      K37B                    ; GO PROCESS
   956 00001113 3C4E                <1> 	cmp	al, 78			; TEST FOR KEY PAD +
   957 00001115 0F849A000000        <1>         je      K37B                    ; GO PROCESS
   958                              <1> 	;
   959                              <1> 	;-----	LOOK FOR KEY PAD ENTRY
   960                              <1> K32:					; ALT-KEY-PAD
   961 0000111B BF[70FA0000]        <1> 	mov	edi, K30		; ALT-INPUT-TABLE offset
   962 00001120 B90A000000          <1> 	mov	ecx, 10			; LOOK FOR ENTRY USING KEYPAD
   963 00001125 F2AE                <1> 	repne	scasb			; LOOK FOR MATCH
   964 00001127 7525                <1> 	jne	short K33		; NO_ALT_KEYPAD
   965 00001129 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF THE NEW KEYS?
   966 0000112C 0F858A000000        <1>         jnz     K37C                    ; YES, JUMP, NOT NUMPAD KEY
   967 00001132 81EF[71FA0000]      <1> 	sub	edi, K30+1		; DI NOW HAS ENTRY VALUE
   968 00001138 A0[B1FB0000]        <1> 	mov	al, [ALT_INPUT] 	; GET THE CURRENT BYTE
   969 0000113D B40A                <1> 	mov	ah, 10			; MULTIPLY BY 10
   970 0000113F F6E4                <1> 	mul	ah
   971 00001141 6601F8              <1> 	add	ax, di			; ADD IN THE LATEST ENTRY
   972 00001144 A2[B1FB0000]        <1> 	mov	[ALT_INPUT], al 	; STORE IT AWAY
   973                              <1> ;K32A:
   974 00001149 E959FFFFFF          <1>         jmp     K26                     ; THROW AWAY THAT KEYSTROKE
   975                              <1> 	;
   976                              <1> 	;-----	LOOK FOR SUPERSHIFT ENTRY
   977                              <1> K33:					; NO-ALT-KEYPAD
   978 0000114E C605[B1FB0000]00    <1>         mov     byte [ALT_INPUT], 0     ; ZERO ANY PREVIOUS ENTRY INTO INPUT
   979 00001155 B91A000000          <1> 	mov	ecx, 26			; (DI),(ES) ALREADY POINTING
   980 0000115A F2AE                <1> 	repne	scasb			; LOOK FOR MATCH IN ALPHABET
   981 0000115C 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 0000115E 3C02                <1> 	cmp	al, 2			; KEY WITH '1' ON IT
   986 00001160 7253                <1> 	jb	short K37B		; MUST BE ESCAPE
   987 00001162 3C0D                <1> 	cmp	al, 13			; IS IT IN THE REGION
   988 00001164 7705                <1> 	ja	short K35		; NO, ALT SOMETHING ELSE
   989 00001166 80C476              <1> 	add	ah, 118			; CONVERT PSEUDO SCAN CODE TO RANGE
   990 00001169 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 0000116B 3C57                <1> 	cmp	al, F11_M		; IS IT F11?	
   995 0000116D 7209                <1> 	jb	short K35A ; 20/02/2015	; NO, BRANCH
   996 0000116F 3C58                <1> 	cmp	al, F12_M		; IS IT F12?
   997 00001171 7705                <1> 	ja	short K35A ; 20/02/2015	; NO, BRANCH
   998 00001173 80C434              <1> 	add	ah, 52			; CONVERT TO PSEUDO SCAN CODE
   999 00001176 EB36                <1> 	jmp	short K37A		; GO FILL THE BUFFER
  1000                              <1> K35A:
  1001 00001178 F6C702              <1> 	test	bh, LC_E0		; DO WE HAVE ONE OF THE NEW KEYS?
  1002 0000117B 7422                <1> 	jz	short K37		; NO, JUMP
  1003 0000117D 3C1C                <1> 	cmp	al, 28			; TEST FOR KEYPAD ENTER
  1004 0000117F 7509                <1>         jne     short K35B              ; NOT THERE
  1005 00001181 66B800A6            <1> 	mov	ax, 0A600h		; SPECIAL CODE
  1006 00001185 E9BC010000          <1> 	jmp	K57			; BUFFER FILL
  1007                              <1> K35B:
  1008 0000118A 3C53                <1> 	cmp	al, 83			; TEST FOR DELETE KEY
  1009 0000118C 742E                <1> 	je	short K37C		; HANDLE WITH OTHER EDIT KEYS
  1010 0000118E 3C35                <1> 	cmp	al, 53			; TEST FOR KEYPAD /
  1011                              <1> 	;jne	short K32A		; NOT THERE, NO OTHER E0 SPECIALS	
  1012 00001190 0F8511FFFFFF        <1>         jne     K26
  1013 00001196 66B800A4            <1> 	mov	ax, 0A400h		; SPECIAL CODE
  1014 0000119A E9A7010000          <1> 	jmp	K57			; BUFFER FILL
  1015                              <1> K37:
  1016 0000119F 3C3B                <1> 	cmp	al, 59			; TEST FOR FUNCTION KEYS (F1)
  1017 000011A1 7212                <1>         jb      short K37B		; NO FN, HANDLE W/OTHER EXTENDED
  1018 000011A3 3C44                <1> 	cmp	al, 68			; IN KEYPAD REGION?
  1019                              <1>         ;ja	short K32A		; IF SO, IGNORE
  1020 000011A5 0F87FCFEFFFF        <1>         ja      K26
  1021 000011AB 80C42D              <1> 	add	ah, 45			; CONVERT TO PSEUDO SCAN CODE
  1022                              <1> K37A:
  1023 000011AE B000                <1> 	mov	al, 0			; ASCII CODE OF ZERO
  1024 000011B0 E991010000          <1>         jmp     K57                     ; PUT IT IN THE BUFFER
  1025                              <1> K37B:
  1026 000011B5 B0F0                <1> 	mov	al, 0F0h		; USE SPECIAL ASCII CODE
  1027 000011B7 E98A010000          <1> 	jmp     K57                     ; PUT IT IN THE BUFFER
  1028                              <1> K37C:
  1029 000011BC 0450                <1> 	add	al, 80			; CONVERT SCAN CODE (EDIT KEYS)
  1030 000011BE 88C4                <1> 	mov	ah, al			; (SCAN CODE NOT IN AH FOR INSERT)
  1031 000011C0 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 000011C2 F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT?
  1037                              <1> 	;jnz	short K38A		; YES, START PROCESSING	
  1038 000011C5 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 000011CB 3C46                <1> 	cmp	al, SCROLL_KEY		; TEST FOR BREAK
  1044 000011CD 7531                <1> 	jne	short K39		; JUMP, NO-BREAK
  1045 000011CF F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1046 000011D2 7405                <1> 	jz	short K38B		; NO, BREAK IS VALID	
  1047 000011D4 F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1048 000011D7 7427                <1> 	jz	short K39		; NO-BREAK, TEST FOR PAUSE	
  1049                              <1> K38B:
  1050 000011D9 8B1D[BAFB0000]      <1> 	mov	ebx, [BUFFER_HEAD] 	; RESET BUFFER TO EMPTY
  1051 000011DF 891D[BEFB0000]      <1> 	mov	[BUFFER_TAIL], ebx
  1052 000011E5 C605[ACFB0000]80    <1> 	mov	byte [BIOS_BREAK], 80h  ; TURN ON BIOS_BREAK BIT
  1053                              <1> 	;
  1054                              <1> 	;-----	ENABLE KEYBOARD
  1055 000011EC B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1056 000011EE 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 000011F3 E8F24A0000          <1> 	call	ctrlbrk ; control+break subroutine
  1062                              <1> 	;
  1063 000011F8 6629C0              <1> 	sub	ax, ax			; PUT OUT DUMMY CHARACTER
  1064 000011FB E946010000          <1>         jmp     K57                     ; BUFFER_FILL
  1065                              <1> 	;
  1066                              <1> 	;-----	TEST FOR PAUSE
  1067                              <1> K39:					; NO_BREAK
  1068 00001200 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1069 00001203 7537                <1> 	jnz	short K41		; YES, THEN THIS CAN'T BE PAUSE	
  1070 00001205 3C45                <1> 	cmp	al, NUM_KEY		; LOOK FOR PAUSE KEY
  1071 00001207 7533                <1> 	jne	short K41		; NO-PAUSE
  1072                              <1> K39P:
  1073 00001209 800D[AEFB0000]08    <1> 	or	byte [KB_FLAG_1], HOLD_STATE ; TURN ON THE HOLD FLAG
  1074                              <1> 	;
  1075                              <1> 	;-----	ENABLE KEYBOARD
  1076 00001210 B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1077 00001212 E89B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1078                              <1> K39A:
  1079 00001217 B020                <1> 	mov	al, EOI			; END OF INTERRUPT TO CONTROL PORT
  1080 00001219 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 0000121B 803D[E2FB0000]07    <1>         cmp     byte [CRT_MODE], 7      ; IS THIS BLACK AND WHITE CARD
  1084 00001222 740A                <1>         je      short K40              	; YES, NOTHING TO DO
  1085 00001224 66BAD803            <1> 	mov	dx, 03D8h		; PORT FOR COLOR CARD
  1086 00001228 A0[E3FB0000]        <1>         mov     al, [CRT_MODE_SET] 	; GET THE VALUE OF THE CURRENT MODE
  1087 0000122D EE                  <1> 	out	dx, al			; SET THE CRT MODE, SO THAT CRT IS ON
  1088                              <1> 	;
  1089                              <1> K40:					; PAUSE-LOOP
  1090 0000122E F605[AEFB0000]08    <1>         test    byte [KB_FLAG_1], HOLD_STATE ; CHECK HOLD STATE FLAG
  1091 00001235 75F7                <1> 	jnz	short K40		; LOOP UNTIL FLAG TURNED OFF
  1092                              <1> 	;
  1093 00001237 E977FEFFFF          <1>         jmp     K27                     ; INTERRUPT_RETURN_NO_EOI
  1094                              <1>         ;
  1095                              <1> 	;-----	TEST SPECIAL CASE KEY 55
  1096                              <1> K41:					; NO-PAUSE
  1097 0000123C 3C37                <1> 	cmp	al, 55			; TEST FOR */PRTSC KEY
  1098 0000123E 7513                <1> 	jne	short K42		; NOT-KEY-55
  1099 00001240 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1100 00001243 7405                <1> 	jz	short K41A		; NO, CTL-PRTSC IS VALID	
  1101 00001245 F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1102 00001248 7421                <1> 	jz	short K42B		; NO, TRANSLATE TO A FUNCTION
  1103                              <1> K41A:	
  1104 0000124A 66B80072            <1> 	mov	ax, 114*256		; START/STOP PRINTING SWITCH
  1105 0000124E E9F3000000          <1>         jmp     K57                     ; BUFFER_FILL
  1106                              <1> 	;
  1107                              <1> 	;-----	SET UP TO TRANSLATE CONTROL SHIFT
  1108                              <1> K42:					; NOT-KEY-55
  1109 00001253 3C0F                <1> 	cmp	al, 15			; IS IT THE TAB KEY?
  1110 00001255 7414                <1> 	je	short K42B		; YES, XLATE TO FUNCTION CODE
  1111 00001257 3C35                <1> 	cmp	al, 53			; IS IT THE / KEY?
  1112 00001259 750E                <1> 	jne	short K42A		; NO, NO MORE SPECIAL CASES	
  1113 0000125B F6C702              <1> 	test	bh, LC_E0		; YES, IS IT FROM THE KEY PAD?
  1114 0000125E 7409                <1> 	jz	short K42A		; NO, JUST TRANSLATE
  1115 00001260 66B80095            <1> 	mov	ax, 9500h		; YES, SPECIAL CODE FOR THIS ONE
  1116 00001264 E9DD000000          <1> 	jmp	K57			; BUFFER FILL	
  1117                              <1> K42A: 
  1118                              <1> 	;;mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1119 00001269 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 0000126B BB[A4FA0000]        <1> 	mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1125 00001270 0F82AE000000        <1> 	jb	K56 ;; 20/02/2015	
  1126 00001276 E9B9000000          <1> 	jmp	K64	
  1127                              <1>         ;
  1128                              <1> 	;-----	NOT IN CONTROL SHIFT
  1129                              <1> K44:					; NOT-CTL-SHIFT
  1130 0000127B 3C37                <1> 	cmp	al, 55			; PRINT SCREEN KEY?
  1131 0000127D 7528                <1> 	jne	short K45		; NOT PRINT SCREEN
  1132 0000127F F6C710              <1> 	test	bh, KBX			; IS THIS ENHANCED KEYBOARD?
  1133 00001282 7407                <1> 	jz	short K44A		; NO, TEST FOR SHIFT STATE	
  1134 00001284 F6C702              <1> 	test	bh, LC_E0		; YES, LAST CODE A MARKER?
  1135 00001287 7507                <1> 	jnz	short K44B		; YES, IS PRINT SCREEN
  1136 00001289 EB41                <1> 	jmp	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1137                              <1> K44A:
  1138 0000128B F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; NOT 101 KBD, SHIFT KEY DOWN?
  1139 0000128E 743C                <1> 	jz	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1140                              <1> 	;
  1141                              <1> 	;-----	ISSUE INTERRUPT TO INDICATE PRINT SCREEN FUNCTION
  1142                              <1> K44B:
  1143 00001290 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
  1144 00001292 E81B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1145 00001297 B020                <1> 	mov	al, EOI			; END OF CURRENT INTERRUPT
  1146 00001299 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 0000129B 8025[B0FB0000]FC    <1>         and     byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; ZERO OUT THESE FLAGS
  1152 000012A2 E90CFEFFFF          <1>         jmp     K27                     ; GO BACK WITHOUT EOI OCCURRING
  1153                              <1> 	;
  1154                              <1> 	;-----	HANDLE IN-CORE KEYS
  1155                              <1> K45:					; NOT-PRINT-SCREEN
  1156 000012A7 3C3A                <1> 	cmp	al, 58			; TEST FOR IN-CORE AREA
  1157 000012A9 7734                <1> 	ja	short K46		; JUMP IF NOT
  1158 000012AB 3C35                <1> 	cmp	al, 53			; IS THIS THE '/' KEY?
  1159 000012AD 7505                <1> 	jne	short K45A		; NO, JUMP
  1160 000012AF F6C702              <1> 	test	bh, LC_E0		; WAS THE LAST CODE THE MARKER?
  1161 000012B2 7518                <1> 	jnz	short K45C		; YES, TRANSLATE TO CHARACTER
  1162                              <1> K45A:
  1163 000012B4 B91A000000          <1> 	mov	ecx, 26			; LENGHT OF SEARCH
  1164 000012B9 BF[7AFA0000]        <1> 	mov	edi, K30+10		; POINT TO TABLE OF A-Z CHARS
  1165 000012BE F2AE                <1> 	repne	scasb			; IS THIS A LETTER KEY?
  1166                              <1> 		; 20/02/2015
  1167 000012C0 7505                <1> 	jne	short K45B              ; NO, SYMBOL KEY
  1168                              <1> 	;
  1169 000012C2 F6C340              <1> 	test	bl, CAPS_STATE		; ARE WE IN CAPS_LOCK?
  1170 000012C5 750C                <1> 	jnz	short K45D		; TEST FOR SURE
  1171                              <1> K45B:
  1172 000012C7 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1173 000012CA 750C                <1> 	jnz	short K45E		; YES, UPPERCASE
  1174                              <1> 					; NO, LOWERCASE
  1175                              <1> K45C:
  1176 000012CC BB[FCFA0000]        <1> 	mov	ebx, K10		; TRANSLATE TO LOWERCASE LETTERS
  1177 000012D1 EB51                <1> 	jmp	short K56	
  1178                              <1> K45D:					; ALMOST-CAPS-STATE
  1179 000012D3 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; CL ON. IS SHIFT ON, TOO?
  1180 000012D6 75F4                <1> 	jnz	short K45C		; SHIFTED TEMP OUT OF CAPS STATE
  1181                              <1> K45E:
  1182 000012D8 BB[54FB0000]        <1> 	mov	ebx, K11		; TRANSLATE TO UPPER CASE LETTERS
  1183 000012DD EB45                <1> K45F:	jmp	short K56
  1184                              <1> 	;
  1185                              <1> 	;-----	TEST FOR KEYS F1 - F10
  1186                              <1> K46:					; NOT IN-CORE AREA
  1187 000012DF 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 000012E1 7635                <1> 	jna	short K53		
  1191                              <1> 	;
  1192                              <1> 	;-----	HANDLE THE NUMERIC PAD KEYS
  1193                              <1> K47:					; NOT F1 - F10
  1194 000012E3 3C53                <1> 	cmp	al, 83			; TEST NUMPAD KEYS
  1195 000012E5 772D                <1> 	ja	short K52		; JUMP IF NOT
  1196                              <1> 	;
  1197                              <1> 	;-----	KEYPAD KEYS, MUST TEST NUM LOCK FOR DETERMINATION
  1198                              <1> K48:
  1199 000012E7 3C4A                <1> 	cmp	al , 74			; SPECIAL CASE FOR MINUS
  1200 000012E9 74ED                <1> 	je	short K45E		; GO TRANSLATE
  1201 000012EB 3C4E                <1> 	cmp	al , 78			; SPECIAL CASE FOR PLUS
  1202 000012ED 74E9                <1> 	je	short K45E		; GO TRANSLATE
  1203 000012EF F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OFTHE NEW KEYS?
  1204 000012F2 750A                <1> 	jnz	short K49		; YES, TRANSLATE TO BASE STATE
  1205                              <1> 	;		
  1206 000012F4 F6C320              <1> 	test 	bl, NUM_STATE		; ARE WE IN NUM LOCK
  1207 000012F7 7514                <1> 	jnz	short K50		; TEST FOR SURE
  1208 000012F9 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1209                              <1> 	;jnz	short K51		; IF SHIFTED, REALLY NUM STATE
  1210 000012FC 75DA                <1> 	jnz	short K45E
  1211                              <1> 	;
  1212                              <1> 	;-----	BASE CASE FOR KEYPAD
  1213                              <1> K49:					
  1214 000012FE 3C4C                <1> 	cmp	al, 76			; SPECIAL CASE FOR BASE STATE 5
  1215 00001300 7504                <1> 	jne	short K49A		; CONTINUE IF NOT KEYPAD 5
  1216 00001302 B0F0                <1> 	mov	al, 0F0h		; SPECIAL ASCII CODE	
  1217 00001304 EB40                <1> 	jmp	short K57		; BUFFER FILL
  1218                              <1> K49A:
  1219 00001306 BB[FCFA0000]        <1> 	mov	ebx, K10		; BASE CASE TABLE	
  1220 0000130B 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 0000130D F6C303              <1>         test    bl, LEFT_SHIFT+RIGHT_SHIFT
  1225 00001310 75EC                <1> 	jnz 	short K49		; SHIFTED TEMP OUT OF NUM STATE
  1226 00001312 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 00001314 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 00001316 74AF                <1> 	je	short K45B		
  1234                              <1> 	;
  1235                              <1> 	;-----	MUST BE F11 OR F12 
  1236                              <1> K53:					; F1 - F10 COME HERE, TOO
  1237 00001318 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST SHIFT STATE
  1238 0000131B 74E1                <1> 	jz	short K49		; JUMP, LOWER CASE PSEUDO SC'S
  1239                              <1> 		; 20/02/2015 
  1240 0000131D BB[54FB0000]        <1> 	mov	ebx, K11		; UPPER CASE PSEUDO SCAN CODES
  1241 00001322 EB10                <1> 	jmp	short K64		; TRANSLATE SCAN
  1242                              <1> 	;
  1243                              <1> 	;-----	TRANSLATE THE CHARACTER
  1244                              <1> K56:					; TRANSLATE-CHAR
  1245 00001324 FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1246 00001326 D7                  <1> 	xlat    			; CONVERT THE SCAN CODE TO ASCII
  1247 00001327 F605[B0FB0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1248 0000132E 7416                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1249 00001330 B4E0                <1> 	mov	ah, MC_E0		; YES, PUT SPECIAL MARKER IN AH
  1250 00001332 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 00001334 FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1255 00001336 D7                  <1>        	xlat    	                ; CTL TABLE SCAN
  1256 00001337 88C4                <1> 	mov	ah, al			; PUT VALUE INTO AH
  1257 00001339 B000                <1> 	mov	al, 0			; ZERO ASCII CODE
  1258 0000133B F605[B0FB0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1259 00001342 7402                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1260 00001344 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 00001346 3CFF                <1> 	cmp	al, -1			; IS THIS AN IGNORE CHAR
  1265                              <1>         ;je	short K59		; YES, DO NOTHING WITH IT
  1266 00001348 0F8459FDFFFF        <1> 	je      K26			; YES, DO NOTHING WITH IT
  1267 0000134E 80FCFF              <1> 	cmp	ah, -1			; LOOK FOR -1 PSEUDO SCAN
  1268                              <1>         ;jne	short K61		; NEAR_INTERRUPT_RETURN
  1269 00001351 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 00001357 80FC68              <1> 	cmp	ah, 68h	; ALT + F1 key
  1275 0000135A 721F                <1> 	jb	short K61
  1276 0000135C 80FC6F              <1> 	cmp	ah, 6Fh ; ALT + F8 key	
  1277 0000135F 771A                <1> 	ja	short K61
  1278                              <1> 	;
  1279 00001361 8A1D[D6330100]      <1> 	mov	bl, [ACTIVE_PAGE]
  1280 00001367 80C368              <1> 	add	bl, 68h
  1281 0000136A 38E3                <1> 	cmp	bl, ah
  1282 0000136C 740D                <1> 	je	short K61
  1283 0000136E 6650                <1> 	push	ax
  1284 00001370 88E0                <1> 	mov	al, ah
  1285 00001372 2C68                <1> 	sub	al, 68h
  1286 00001374 E8F4050000          <1> 	call	set_active_page
  1287 00001379 6658                <1> 	pop	ax
  1288                              <1> K61:					; NOT-CAPS-STATE
  1289 0000137B 8B1D[BEFB0000]      <1> 	mov	ebx, [BUFFER_TAIL] 	; GET THE END POINTER TO THE BUFFER
  1290 00001381 89DE                <1> 	mov	esi, ebx		; SAVE THE VALUE
  1291 00001383 E857FAFFFF          <1> 	call	_K4			; ADVANCE THE TAIL
  1292 00001388 3B1D[BAFB0000]      <1> 	cmp	ebx, [BUFFER_HEAD] 	; HAS THE BUFFER WRAPPED AROUND
  1293 0000138E 740E                <1> 	je	short K62		; BUFFER_FULL_BEEP
  1294 00001390 668906              <1> 	mov	[esi], ax		; STORE THE VALUE
  1295 00001393 891D[BEFB0000]      <1> 	mov	[BUFFER_TAIL], ebx 	; MOVE THE POINTER UP
  1296 00001399 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 0000139E B020                <1> 	mov	al, EOI			; ENABLE INTERRUPT CONTROLLER CHIP
  1311 000013A0 E620                <1> 	out	INTA00, al
  1312 000013A2 66B9A602            <1> 	mov	cx, 678			; DIVISOR FOR 1760 HZ
  1313 000013A6 B304                <1> 	mov	bl, 4			; SHORT BEEP COUNT (1/16 + 1/64 DELAY)
  1314 000013A8 E8E5090000          <1> 	call	beep			; GO TO COMMON BEEP HANDLER
  1315 000013AD 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 000013B2 6650                <1> 	push	ax			; SAVE DATA TO SEND
  1325                              <1> 
  1326                              <1> 	;-----	WAIT FOR COMMAND TO ACCEPTED
  1327 000013B4 FA                  <1> 	cli				; DISABLE INTERRUPTS TILL DATA SENT
  1328                              <1> 	; xor	ecx, ecx		; CLEAR TIMEOUT COUNTER
  1329 000013B5 B900000100          <1> 	mov	ecx, 10000h			
  1330                              <1> S10:
  1331 000013BA E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD CONTROLLER STATUS
  1332 000013BC A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ITS INPUT BUFFER BUSY
  1333 000013BE E0FA                <1> 	loopnz	S10			; WAIT FOR COMMAND TO BE ACCEPTED
  1334                              <1> 
  1335 000013C0 6658                <1> 	pop	ax			; GET DATA TO SEND
  1336 000013C2 E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROLLER
  1337 000013C4 FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
  1338 000013C5 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 000013C6 6650                <1> 	push	ax			; SAVE REGISTERS
  1349 000013C8 6653                <1> 	push	bx
  1350 000013CA 51                  <1> 	push	ecx
  1351 000013CB 88C7                <1> 	mov	bh, al			; SAVE TRANSMITTED BYTE FOR RETRIES
  1352 000013CD B303                <1> 	mov	bl, 3			; LOAD RETRY COUNT
  1353                              <1> SD0:
  1354 000013CF FA                  <1> 	cli				; DISABLE INTERRUPTS
  1355 000013D0 8025[AFFB0000]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 000013D7 B900000100          <1> 	mov	ecx, 10000h		; MAXIMUM WAIT COUNT
  1359                              <1> SD5:
  1360 000013DC E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD PROCESSOR STATUS PORT
  1361 000013DE A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ANY PENDING COMMAND
  1362 000013E0 E0FA                <1> 	loopnz	SD5			; WAIT FOR COMMAND TO BE ACCEPTED
  1363                              <1> 	;
  1364 000013E2 88F8                <1> 	mov	al, bh			; REESTABLISH BYTE TO TRANSMIT
  1365 000013E4 E660                <1> 	out	PORT_A, al		; SEND BYTE
  1366 000013E6 FB                  <1> 	sti				; ENABLE INTERRUPTS
  1367                              <1> 	;mov	cx, 01A00h		; LOAD COUNT FOR 10 ms+
  1368 000013E7 B9FFFF0000          <1> 	mov	ecx, 0FFFFh
  1369                              <1> SD1:
  1370 000013EC F605[AFFB0000]30    <1> 	test	byte [KB_FLAG_2], KB_FE+KB_FA ; SEE IF EITHER BIT SET
  1371 000013F3 750F                <1> 	jnz	short SD3		; IF SET, SOMETHING RECEIVED GO PROCESS
  1372 000013F5 E2F5                <1> 	loop	SD1			; OTHERWISE WAIT
  1373                              <1> SD2:
  1374 000013F7 FECB                <1> 	dec	bl			; DECREMENT RETRY COUNT
  1375 000013F9 75D4                <1> 	jnz	short SD0		; RETRY TRANSMISSION
  1376 000013FB 800D[AFFB0000]80    <1> 	or	byte [KB_FLAG_2], KB_ERR ; TURN ON TRANSMIT ERROR FLAG
  1377 00001402 EB09                <1> 	jmp	short SD4		; RETRIES EXHAUSTED FORGET TRANSMISSION
  1378                              <1> SD3:
  1379 00001404 F605[AFFB0000]10    <1> 	test	byte [KB_FLAG_2], KB_FA ; SEE IF THIS IS AN ACKNOWLEDGE
  1380 0000140B 74EA                <1> 	jz	short SD2		; IF NOT, GO RESEND
  1381                              <1> SD4:	
  1382 0000140D 59                  <1> 	pop	ecx			; RESTORE REGISTERS
  1383 0000140E 665B                <1> 	pop	bx
  1384 00001410 6658                <1> 	pop	ax
  1385 00001412 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 00001413 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1395 00001414 F605[AFFB0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1396 0000141B 755F                <1> 	jnz 	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1397                              <1> 	;
  1398 0000141D 800D[AFFB0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1399 00001424 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
  1400 00001426 E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
  1401 00001428 EB11                <1> 	jmp	short SL0		; GO SEND MODE INDICATOR COMMAND
  1402                              <1> SND_LED1:
  1403 0000142A FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1404 0000142B F605[AFFB0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1405 00001432 7548                <1> 	jnz	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1406                              <1> 	;
  1407 00001434 800D[AFFB0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1408                              <1> SL0:
  1409 0000143B B0ED                <1> 	mov	al, LED_CMD		; LED CMD BYTE
  1410 0000143D E884FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1411 00001442 FA                  <1> 	cli
  1412 00001443 E836000000          <1> 	call	MAKE_LED		; GO FORM INDICATOR DATA BYTE
  1413 00001448 8025[AFFB0000]F8    <1> 	and	byte [KB_FLAG_2], 0F8h	; ~KB_LEDS ; CLEAR MODE INDICATOR BITS
  1414 0000144F 0805[AFFB0000]      <1> 	or	[KB_FLAG_2], al 	; SAVE PRESENT INDICATORS FOR NEXT TIME
  1415 00001455 F605[AFFB0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1416 0000145C 750F                <1> 	jnz	short SL2		; IF SO, BYPASS SECOND BYTE TRANSMISSION
  1417                              <1> 	;
  1418 0000145E E863FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1419 00001463 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1420 00001464 F605[AFFB0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1421 0000146B 7408                <1> 	jz	short SL3		; IF NOT, DON'T SEND AN ENABLE COMMAND
  1422                              <1> SL2:
  1423 0000146D B0F4                <1> 	mov	al, KB_ENABLE		; GET KEYBOARD CSA ENABLE COMMAND
  1424 0000146F E852FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1425 00001474 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1426                              <1> SL3:
  1427 00001475 8025[AFFB0000]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 0000147C FB                  <1> 	sti				; ENABLE INTERRUPTS
  1430 0000147D 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 0000147E A0[ADFB0000]        <1> 	mov	al, [KB_FLAG]		; GET CAPS & NUM LOCK INDICATORS
  1441 00001483 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 00001485 C0C004              <1> 	rol	al, 4 ; 20/02/2015
  1445 00001488 2407                <1> 	and	al, 07h			; MAKE SURE ONLY MODE BITS ON
  1446                              <1> 	;pop	cx
  1447 0000148A 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 ///
  1931                                  
  1932                                  %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 0000148B 9C                  <1> 	pushfd
    35 0000148C 0E                  <1> 	push 	cs
    36 0000148D E851000000          <1> 	call 	VIDEO_IO_1
    37 00001492 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 00001493 [40150000]          <1> M1:	dd	SET_MODE	; TABLE OF ROUTINES WITHIN VIDEO I/O
   191 00001497 [A8180000]          <1> 	dd	SET_CTYPE
   192 0000149B [DC180000]          <1> 	dd	SET_CPOS
   193 0000149F [04190000]          <1> 	dd	READ_CURSOR
   194                              <1> 	;dd	VIDEO_RETURN	; READ_LPEN
   195 000014A3 [29150000]          <1> 	dd	set_mode_ncm	; Set mode without clearing video memory
   196 000014A7 [4A190000]          <1> 	dd	ACT_DISP_PAGE
   197 000014AB [E1190000]          <1> 	dd	SCROLL_UP
   198 000014AF [051B0000]          <1> 	dd	SCROLL_DOWN
   199 000014B3 [861B0000]          <1> 	dd	READ_AC_CURRENT
   200 000014B7 [DE1B0000]          <1> 	dd	WRITE_AC_CURRENT
   201 000014BB [041C0000]          <1> 	dd	WRITE_C_CURRENT
   202 000014BF [2A250000]          <1> 	dd	SET_COLOR
   203 000014C3 [95250000]          <1> 	dd	WRITE_DOT
   204 000014C7 [60250000]          <1> 	dd	READ_DOT
   205 000014CB [861C0000]          <1> 	dd	WRITE_TTY
   206 000014CF [11150000]          <1> 	dd	VIDEO_STATE
   207 000014D3 [E02E0000]          <1> 	dd	vga_pal_funcs ; 10/08/2016 (TRDOS 386)
   208 000014D7 [962A0000]          <1> 	dd	font_setup    ; 10/07/2016 (TRDOS 386)
   209 000014DB [45150000]          <1> 	dd	VIDEO_RETURN	; RESERVED
   210 000014DF [F31D0000]          <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 000014E3 FC                  <1> 	cld				; SET DIRECTION FORWARD
   228 000014E4 80FC14              <1> 	cmp	ah, M1L/4		; TEST FOR WITHIN TABLE RANGE
   229 000014E7 7327                <1> 	jnb	short M4		; BRANCH TO EXIT IF NOT A VALID COMMAND
   230                              <1> 
   231 000014E9 06                  <1> 	push	es
   232 000014EA 1E                  <1> 	push	ds			; SAVE WORK AND PARAMETER REGISTERS
   233 000014EB 52                  <1> 	push	edx
   234 000014EC 51                  <1> 	push	ecx
   235 000014ED 53                  <1> 	push	ebx
   236 000014EE 56                  <1> 	push	esi
   237 000014EF 57                  <1> 	push	edi
   238 000014F0 55                  <1> 	push	ebp
   239                              <1> 
   240 000014F1 66BE1000            <1> 	mov	si, KDATA 		; POINT DS: TO DATA SEGMENT
   241 000014F5 8EDE                <1> 	mov	ds, si
   242 000014F7 8EC6                <1> 	mov	es, si
   243 000014F9 BF00800B00          <1> 	mov	edi, 0B8000h		; GET offset FOR COLOR CARD
   244 000014FE A3[34410100]        <1> 	mov	[video_eax], eax ; 12/05/2016 
   245                              <1> 	; 23/03/2016
   246 00001503 C0E402              <1> 	shl	ah, 2  ; dword		; TIMES 2 FOR WORD TABLE LOOKUP
   247 00001506 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 00001509 FB                  <1> 	sti
   255                              <1> 	;
   256                              <1> 
   257 0000150A FFA6[93140000]      <1> 	JMP	dword [esi+M1]		; GO TO SELECTED FUNCTION
   258                              <1> 
   259                              <1> M4:					; COMMAND NOT VALID
   260 00001510 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 00001511 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS]	; GET NUMBER OF COLUMNS
   276 00001517 A0[E2FB0000]        <1> 	mov	al, [CRT_MODE]	; CURRENT MODE
   277                              <1> 	;movzx	esi, al
   278                              <1> 	;mov	ah, [esi+M6] 
   279                              <1> 	; BH = active page
   280 0000151C 8A3D[D6330100]      <1> 	mov	bh, [ACTIVE_PAGE] ; GET CURRENT ACTIVE PAGE
   281 00001522 FA                  <1> 	cli	; 02/01/2017
   282 00001523 5D                  <1> 	pop	ebp		; RECOVER REGISTERS
   283 00001524 5F                  <1> 	pop	edi
   284 00001525 5E                  <1> 	pop	esi
   285 00001526 59                  <1> 	pop	ecx		; DISCARD SAVED BX
   286 00001527 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 00001529 3C07                <1> 	cmp	al, 7 ; IBM PC CGA modes
   293 0000152B 7613                <1> 	jna	short SET_MODE ; normal function (clear)
   294                              <1> 	; do not clear memory
   295 0000152D A2[43410100]        <1> 	mov	[noclearmem], al ; > 0
   296 00001532 E81F000000          <1> 	call	_set_mode
   297 00001537 C605[43410100]00    <1> 	mov	byte [noclearmem], 0
   298 0000153E 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 00001540 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 00001545 A1[34410100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
   339                              <1> _video_return:
   340 0000154A FA                  <1> 	cli ; 02/01/2017
   341 0000154B 5D                  <1> 	pop	ebp
   342 0000154C 5F                  <1> 	pop	edi
   343 0000154D 5E                  <1> 	pop	esi
   344 0000154E 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 0000154F 59                  <1> 	pop	ecx
   351 00001550 5A                  <1> 	pop	edx
   352 00001551 1F                  <1> 	pop	ds
   353 00001552 07                  <1> 	pop	es	; RECOVER SEGMENTS
   354 00001553 CF                  <1> 	iretd		; ALL DONE
   355                              <1> 
   356                              <1> set_txt_mode:
   357                              <1> 	; 29/07/2016
   358                              <1> 	; 27/06/2016
   359 00001554 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 00001556 3805[E2FB0000]      <1> 	cmp	[CRT_MODE], al  ; current mode = requested mode ?
   382 0000155C 750D                <1> 	jne	short _sm_0
   383 0000155E 3C03                <1> 	cmp	al, 3		; text, 80*25 color, default mode
   384                              <1> 				; for TRDOS 386 MainProg
   385 00001560 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 00001562 800D[41410100]80    <1> 	or	byte [p_crt_mode], 80h ; clear page indicator
   393 00001569 EB5B                <1>         jmp     short _sm_3
   394                              <1> _sm_0:  
   395 0000156B 803D[E2FB0000]03    <1> 	cmp	byte [CRT_MODE], 3
   396 00001572 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 00001574 BE00800B00          <1> 	mov	esi, 0B8000h
   407 00001579 BF00800900          <1> 	mov	edi, 98000h ; 30/07/2016
   408 0000157E B900200000          <1> 	mov	ecx, (0B8000h-0B0000h)/4
   409 00001583 F3A5                <1> 	rep	movsd
   410                              <1> 
   411 00001585 C605[41410100]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 0000158C BE[C6330100]        <1> 	mov	esi, CURSOR_POSN
   417 00001591 BF[46410100]        <1> 	mov	edi, cursor_pposn    ; cursor positions backup
   418 00001596 B104                <1> 	mov	cl, 4
   419 00001598 F3A5                <1> 	rep	movsd
   420                              <1> 
   421                              <1> 	; 29/07/2016
   422                              <1> 	;mov	[ACTIVE_PAGE], cl ; 0
   423 0000159A 860D[D6330100]      <1> 	xchg	cl, [ACTIVE_PAGE]
   424 000015A0 880D[42410100]      <1> 	mov	[p_crt_page], cl     ; previous page (for mode 3)	
   425                              <1> 	; [ACTIVE_PAGE] = 0 
   426 000015A6 EB19                <1> 	jmp	short _sm_2
   427                              <1> 
   428                              <1> _sm_1:
   429 000015A8 3C03                <1> 	cmp	al, 3		; text, 80*25 color, default mode
   430                              <1> 				; for TRDOS 386 MainProg
   431 000015AA 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 000015AC 803D[41410100]03    <1> 	cmp	byte [p_crt_mode], 3 ; previous mode, backup sign
   439 000015B3 750C                <1> 	jne	short _sm_2 ; there is no (multiscreen) video pages
   440                              <1> 			 ; to be restored
   441 000015B5 8A0D[42410100]      <1> 	mov	cl, [p_crt_page]
   442 000015BB 880D[D6330100]      <1> 	mov	[ACTIVE_PAGE], cl
   443                              <1> 
   444                              <1> _sm_2:
   445 000015C1 A2[E2FB0000]        <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 000015C6 88C4                <1> 	mov	ah, al
   466 000015C8 B910000000          <1> 	mov	ecx, vga_mode_count 	
   467 000015CD BE[FEFB0000]        <1> 	mov	esi, vga_modes
   468 000015D2 31DB                <1> 	xor	ebx, ebx
   469                              <1> _sm_4:
   470 000015D4 AC                  <1> 	lodsb
   471 000015D5 38C4                <1> 	cmp	ah, al
   472 000015D7 740C                <1> 	je	short _sm_5
   473 000015D9 FEC3                <1> 	inc	bl
   474 000015DB E2F7                <1> 	loop	_sm_4
   475                              <1> 
   476                              <1> 	; UNIMPLEMENTED VIDEO MODE !
   477 000015DD 31C0                <1> 	xor	eax, eax
   478 000015DF A3[34410100]        <1>         mov     [video_eax], eax ; 0 
   479 000015E4 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 000015E5 89DE                <1> 	mov	esi, ebx
   485 000015E7 81C6[4EFC0000]      <1> 	add	esi, vga_memmodel
   486 000015ED 8A06                <1> 	mov	al, [esi]
   487 000015EF A2[5A410100]        <1> 	mov	[VGA_MTYPE], al
   488                              <1> 
   489 000015F4 89DF                <1> 	mov	edi, ebx
   490 000015F6 81C7[5EFC0000]      <1> 	add	edi, vga_dac_s 	
   491 000015FC C0E302              <1> 	shl	bl, 2 ; byte -> dword
   492 000015FF 81C3[0EFC0000]      <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 00001605 8B33                <1> 	mov	esi, [ebx]
   500 00001607 89F3                <1> 	mov	ebx, esi
   501 00001609 83C614              <1> 	add	esi, vga_p_cm_pos ; ebx + 20
   502 0000160C 668B06              <1> 	mov	ax, [esi]       ; get the cursor mode from the table
   503 0000160F 66A3[FBFB0000]      <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 00001615 E83B020000          <1> 	call	cursor_shape_fix
   507                              <1> 	; al = 14, ah = 15  (If [CHAR_HEIGHT] = 16)
   508 0000161A 668906              <1> 	mov	[esi], ax
   509                              <1> 
   510 0000161D 56                  <1> 	push	esi ; *	
   511                              <1> 
   512 0000161E 8A25[E9FB0000]      <1> 	mov	ah, [VGA_MODESET_CTL]
   513 00001624 80E408              <1> 	and	ah, 8 ; default palette loading ?
   514 00001627 7524                <1> 	jnz	short _sm_6
   515 00001629 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK (DAC mask register)
   516 0000162D B0FF                <1> 	mov	al, 0FFh ; PEL mask
   517 0000162F EE                  <1> 	out	dx, al
   518 00001630 8A27                <1> 	mov	ah, [edi] ; DAC model (selection number)
   519 00001632 E8ED0F0000          <1> 	call	load_dac_palette
   520                              <1> 	; ecx = 0
   521 00001637 F605[E9FB0000]02    <1> 	test	byte [VGA_MODESET_CTL], 2 ; gray scale summing
   522 0000163E 740D                <1> 	jz	short _sm_6
   523 00001640 53                  <1> 	push	ebx
   524 00001641 29DB                <1> 	sub	ebx, ebx ; sub bl, bl
   525 00001643 66B90001            <1>         mov     cx, 256 
   526 00001647 E82B100000          <1> 	call	gray_scale_summing
   527 0000164C 5B                  <1> 	pop	ebx	
   528                              <1> _sm_6:
   529                              <1> 	; Reset Attribute Ctl flip-flop
   530 0000164D 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
   531 00001651 EC                  <1>  	in	al, dx
   532                              <1> 	; Set Attribute Ctl
   533 00001652 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   534 00001654 83C623              <1> 	add	esi, 35  ; actl regs
   535 00001657 30E4                <1> 	xor	ah, ah ; 0
   536 00001659 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
   537                              <1> _sm_7:
   538 0000165D 88E0                <1> 	mov	al, ah
   539 0000165F EE                  <1> 	out	dx, al ; index
   540 00001660 AC                  <1> 	lodsb
   541                              <1> 	; DX = 3C0h = VGAREG_ACTL_WRITE_DATA
   542 00001661 EE                  <1> 	out	dx, al ; value
   543 00001662 FEC4                <1> 	inc	ah
   544 00001664 80FC14              <1> 	cmp	ah, 20 ; number of actl registers
   545 00001667 72F4                <1> 	jb	short _sm_7
   546                              <1> 	;
   547 00001669 88E0                <1> 	mov	al, ah ; 20
   548 0000166B EE                  <1> 	out	dx, al ; index
   549 0000166C 28C0                <1> 	sub	al, al ; 0
   550 0000166E EE                  <1> 	out	dx, al ; value
   551                              <1> 	;
   552                              <1> 	; Set Sequencer Ctl
   553 0000166F 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   554 00001671 83C605              <1> 	add	esi, 5 ; sequ regs
   555                              <1> 	;
   556 00001674 66BAC403            <1> 	mov	dx, 3C4h  ; VGAREG_SEQU_ADDRESS
   557 00001678 EE                  <1> 	out	dx, al ; 0
   558 00001679 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
   559 0000167B B003                <1> 	mov	al, 3
   560 0000167D EE                  <1> 	out	dx, al
   561 0000167E B401                <1> 	mov	ah, 1	
   562                              <1> _sm_8:
   563 00001680 88E0                <1> 	mov	al, ah
   564                              <1> 	;mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   565 00001682 664A                <1> 	dec	dx
   566 00001684 EE                  <1> 	out	dx, al ; index
   567 00001685 AC                  <1> 	lodsb
   568 00001686 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
   569 00001688 EE                  <1> 	out	dx, al
   570 00001689 80FC04              <1> 	cmp	ah, 4 ; number of sequ regs
   571 0000168C 7304                <1> 	jnb	short _sm_9		
   572 0000168E FEC4                <1> 	inc	ah 
   573 00001690 EBEE                <1> 	jmp	short _sm_8
   574                              <1> _sm_9:
   575                              <1> 	; Set Grafx Ctl
   576 00001692 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   577 00001694 83C637              <1> 	add	esi, 55 ; grdc regs
   578 00001697 30E4                <1> 	xor	ah, ah ; 0
   579                              <1> _sm_10:
   580 00001699 88E0                <1> 	mov	al, ah
   581 0000169B 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
   582 0000169F EE                  <1> 	out	dx, al	
   583 000016A0 AC                  <1> 	lodsb
   584 000016A1 6642                <1> 	inc	dx ; 3CFh ; VGAREG_GRDC_DATA
   585 000016A3 EE                  <1> 	out	dx, al
   586 000016A4 FEC4                <1> 	inc	ah
   587 000016A6 80FC09              <1> 	cmp	ah, 9 ; number of grdc regs
   588 000016A9 72EE                <1> 	jb	short _sm_10
   589                              <1> 	;
   590                              <1> 	; Disable CRTC write protection
   591 000016AB 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 000016AF 66B81100            <1> 	mov	ax, 11h
   598 000016B3 66EF                <1> 	out	dx, ax
   599 000016B5 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   600 000016B7 83C60A              <1> 	add	esi, 10 ; crtc regs
   601                              <1> 	; ah = 0
   602                              <1> _sm_11:
   603 000016BA 88E0                <1> 	mov	al, ah
   604                              <1> 	; dx = 3D4h = VGAREG_VGA_CRTC_ADDRESS
   605 000016BC EE                  <1> 	out	dx, al ; index
   606 000016BD AC                  <1> 	lodsb
   607 000016BE 6642                <1> 	inc	dx  ; VGAREG_VGA_CRTC_ADDRESS + 1
   608 000016C0 EE                  <1> 	out	dx, al ; value
   609 000016C1 80FC18              <1> 	cmp	ah, 24 ; number of crtc registers - 1
   610 000016C4 7306                <1> 	jnb	short _sm_12
   611 000016C6 FEC4                <1> 	inc	ah
   612 000016C8 664A                <1> 	dec	dx ; 3D4h
   613 000016CA EBEE                <1> 	jmp	short _sm_11
   614                              <1> _sm_12:
   615                              <1> 	; Set the misc register
   616 000016CC 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
   617 000016D0 8A4309              <1> 	mov	al, [ebx+9] ; misc reg
   618 000016D3 EE                  <1> 	out	dx, al
   619                              <1> 	;
   620                              <1> 	; Enable video
   621 000016D4 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
   622 000016D8 B020                <1> 	mov	al, 20h  
   623 000016DA EE                  <1>         out     dx, al   ; set bit 5 to 1
   624 000016DB 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
   625 000016DF EC                  <1> 	in	al, dx
   626                              <1> 	;
   627 000016E0 803D[43410100]00    <1> 	cmp	byte [noclearmem], 0
   628 000016E7 7740                <1>         ja      short _sm_15
   629                              <1> 
   630                              <1> 	; 29/07/2016
   631 000016E9 31C0                <1> 	xor	eax, eax
   632 000016EB B900400000          <1> 	mov	ecx, 4000h ; 16K words (32K)
   633 000016F0 803D[5A410100]02    <1> 	cmp     byte [VGA_MTYPE], 2  ; CTEXT, MTEXT, CGA
   634 000016F7 7715                <1> 	ja	short _sm_14    ; no ? (0A0000h)
   635 000016F9 BF00800B00          <1> 	mov	edi, 0B8000h
   636 000016FE 7409                <1> 	je	short _sm_13	; CGA graphics mode
   637                              <1> 	; 08/08/2016
   638 00001700 A3[56410100]        <1> 	mov	[VGA_INT43H], eax ; 0 ; default font 
   639 00001705 66B82007            <1> 	mov	ax, 0720h	; CGA text mode
   640                              <1> _sm_13:
   641 00001709 F366AB              <1> 	rep	stosw
   642 0000170C EB1B                <1> 	jmp	short _sm_15		
   643                              <1> 
   644                              <1> _sm_14:
   645 0000170E BF00000A00          <1> 	mov	edi, 0A0000h
   646                              <1> 	; ecx = 16384 dwords  (64K)
   647 00001713 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   648 00001717 B002                <1> 	mov	al, 2
   649 00001719 EE                  <1> 	out	dx, al
   650                              <1> 	;mov	dx, 3C5h ; VGAREG_SEQU_DATA
   651 0000171A 6642                <1> 	inc	dx
   652 0000171C EC                  <1> 	in	al, dx ; mmask
   653 0000171D 6650                <1> 	push	ax
   654 0000171F B00F                <1> 	mov	al, 0Fh ; all planes
   655 00001721 EE                  <1> 	out	dx, al
   656 00001722 30C0                <1> 	xor	al, al ; 0
   657 00001724 F3AB                <1> 	rep	stosd	; ecx = 163684 (64K)
   658 00001726 6658                <1> 	pop	ax
   659 00001728 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 00001729 668B03              <1> 	mov	ax, [ebx] ; num of columns, 'twidth'
   664 0000172C A2[E4FB0000]        <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 00001731 FEC4                <1> 	inc	ah ; 09/07/2016
   669 00001733 8825[EAFB0000]      <1> 	mov	[VGA_ROWS], ah
   670                              <1> 	; 10/08/2016
   671 00001739 8A4302              <1> 	mov	al, [ebx+2]
   672 0000173C A2[E6FB0000]        <1> 	mov	[CHAR_HEIGHT], al 
   673                              <1> 	; 29/07/2016
   674                              <1> 	; length of regen buffer in bytes
   675 00001741 668B4B03            <1> 	mov	cx, [ebx+3] ; 'slength_l'
   676 00001745 66890D[44410100]    <1> 	mov	[CRT_LEN], cx
   677                              <1> 	;
   678                              <1> 	; 27/07/2016
   679 0000174C 30E4                <1> 	xor	ah, ah
   680 0000174E A0[D6330100]        <1> 	mov	al, [ACTIVE_PAGE] ; may be > 0 for mode 3
   681                              <1> 	;mul	word [CRT_LEN] ; 4096 for mode 3
   682 00001753 66F7E1              <1> 	mul	cx ; 29/07/2016
   683 00001756 66A3[C4330100]      <1> 	mov	[CRT_START], ax
   684                              <1> 	;
   685 0000175C B060                <1> 	mov	al, 60h
   686 0000175E 803D[43410100]00    <1> 	cmp	byte [noclearmem], 0
   687 00001765 7602                <1> 	jna	short _sm_16
   688 00001767 0480                <1> 	add	al, 80h
   689                              <1> _sm_16:
   690 00001769 A2[E7FB0000]        <1> 	mov	[VGA_VIDEO_CTL], al
   691 0000176E C605[E8FB0000]F9    <1> 	mov	byte [VGA_SWITCHES], 0F9h
   692 00001775 8025[E9FB0000]7F    <1> 	and	byte [VGA_MODESET_CTL], 7Fh
   693                              <1> 
   694 0000177C 5E                  <1> 	pop	esi ; *
   695                              <1> 
   696                              <1> 	; 26/07/2016
   697                              <1> 	; 07/07/2016
   698 0000177D 668B0D[FBFB0000]    <1> 	mov	cx, [CURSOR_MODE] ; restore cursor mode (initial value)
   699 00001784 66870E              <1> 	xchg	cx, [esi] ; cl = start line, ch = end line
   700                              <1> 			  ; reset to initial value
   701 00001787 86E9                <1> 	xchg 	ch, cl  ; ch = start line, cl = end line  
   702 00001789 66890D[FBFB0000]    <1> 	mov	[CURSOR_MODE], cx ; save (fixed) cursor mode
   703                              <1> 
   704                              <1> 	; 27/07/2016
   705 00001790 803D[5A410100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
   706 00001797 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 00001799 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
   714 0000179B E8C4050000          <1> 	call	m16	; output cx register
   715                              <1> 	
   716                              <1> 	; 25/07/2016
   717 000017A0 803D[E2FB0000]03    <1>         cmp     byte [CRT_MODE], 03h
   718 000017A7 7507                <1> 	jne	short _sm_17
   719                              <1> 	; 26/07/2016
   720                              <1> 
   721 000017A9 A0[D6330100]        <1> 	mov	al, [ACTIVE_PAGE]
   722 000017AE EB0C                <1> 	jmp	short _sm_18
   723                              <1> _sm_17:
   724                              <1> 	; Set cursor pos for page 0..7
   725 000017B0 6629C0              <1> 	sub	ax, ax ; eax = 0
   726 000017B3 BF[C6330100]        <1> 	mov	edi, CURSOR_POSN
   727 000017B8 AB                  <1> 	stosd	
   728 000017B9 AB                  <1> 	stosd
   729 000017BA AB                  <1> 	stosd
   730 000017BB 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 000017BC 803D[5A410100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
   736 000017C3 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 000017C9 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 000017CB 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 000017D0 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   756                              <1> 	;mov	ah, bl
   757 000017D4 28E4                <1> 	sub	ah, ah ; 0
   758 000017D6 B003                <1> 	mov	al, 03h
   759 000017D8 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 000017DA 30C0                <1> 	xor	al, al
   768 000017DC 3805[41410100]      <1>         cmp     byte [p_crt_mode], al ; 0 
   769 000017E2 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 000017E4 A2[D6330100]        <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 000017E9 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 000017EB 0FB61D[D6330100]    <1> 	movzx	ebx, byte [ACTIVE_PAGE]
   800 000017F2 D0E3                <1> 	shl	bl, 1 ; * 2
   801 000017F4 81C3[C6330100]      <1> 	add	ebx, CURSOR_POSN
   802                              <1> 
   803                              <1> 	; 29/07/2016
   804 000017FA F605[41410100]7F    <1> 	test    byte [p_crt_mode], 7Fh ; 83h or 3h
   805 00001801 7427                <1> 	jz	short _sm_21	; do not restore video pages
   806                              <1> 
   807                              <1> 	;; restore video pages
   808 00001803 BE00800900          <1> 	mov	esi, 98000h ; 30/07/2016 
   809 00001808 BF00800B00          <1> 	mov	edi, 0B8000h
   810 0000180D 66B90020            <1> 	mov	cx, 2000h ; 8K dwords (32K)
   811 00001811 F3A5                <1> 	rep	movsd
   812                              <1> 
   813                              <1> 	; restore cursor positions
   814 00001813 BE[46410100]        <1> 	mov	esi, cursor_pposn
   815 00001818 BF[C6330100]        <1> 	mov	edi, CURSOR_POSN
   816                              <1> 	;mov	ecx, 4	; restore all cursor positions (16 bytes)
   817 0000181D B104                <1> 	mov	cl, 4
   818 0000181F F3A5                <1> 	rep 	movsd
   819                              <1> 
   820 00001821 F605[41410100]80    <1>         test    byte [p_crt_mode], 80h
   821 00001828 7420                <1> 	jz	short _sm_22 ; do not clear current video pages
   822                              <1> _sm_21:
   823                              <1> 	; clear video page
   824 0000182A 668B0D[44410100]    <1> 	mov	cx, [CRT_LEN] ; 4096 
   825 00001831 66D1E9              <1> 	shr	cx, 1 ; 2072
   826 00001834 66B82007            <1> 	mov	ax, 0720h
   827 00001838 BF00800B00          <1> 	mov	edi, 0B8000h ; [crt_base]
   828 0000183D 66033D[C4330100]    <1> 	add	di, [CRT_START]
   829 00001844 F366AB              <1> 	rep	stosw	; FILL THE REGEN BUFFER WITH BLANKS
   830                              <1> 	;
   831 00001847 66890B              <1> 	mov	[ebx], cx ; reset cursor position
   832                              <1> _sm_22:
   833 0000184A A2[41410100]        <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 0000184F E81E010000          <1> 	call	_set_active_page
   838                              <1> 
   839                              <1> ;-----	NORMAL RETURN FROM ALL VIDEO RETURNS
   840 00001854 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 00001855 803D[E6FB0000]08    <1> 	cmp	byte [CHAR_HEIGHT], 8
   864 0000185C 7649                <1> 	jna	short csf_3
   865 0000185E 80FC08              <1> 	cmp	ah, 8
   866 00001861 7344                <1> 	jnb	short csf_3
   867 00001863 3C20                <1> 	cmp	al, 20h
   868 00001865 7340                <1> 	jnb	short csf_3
   869                              <1> 	;
   870 00001867 6650                <1> 	push	ax
   871                              <1> 	; {
   872                              <1>    	; if(CL!=(CH+1))	
   873 00001869 FEC0                <1> 	inc	al
   874 0000186B 38C4                <1> 	cmp	ah, al   ; ah != al + 1
   875 0000186D 740F                <1>         je      short csf_1
   876                              <1> 	; CH = ((CH+1) * cheight / 8) -1;
   877 0000186F 8A25[E6FB0000]      <1> 	mov	ah, [CHAR_HEIGHT]
   878 00001875 F6E4                <1> 	mul	ah
   879 00001877 C0E803              <1> 	shr	al, 3 ; / 8
   880 0000187A FEC8                <1> 	dec	al ; - 1
   881 0000187C EB0E                <1> 	jmp	short csf_2 
   882                              <1> csf_1: 	
   883                              <1>  	; }
   884                              <1>    	; else		; ah = al + 1
   885                              <1>     	; {
   886 0000187E FEC4                <1> 	inc	ah	; ah = ah + 1   
   887                              <1> 	; CH = ((CL+1) * cheight / 8) - 2;
   888 00001880 A0[E6FB0000]        <1> 	mov	al, [CHAR_HEIGHT]
   889 00001885 F6E4                <1> 	mul	ah
   890 00001887 C0E803              <1> 	shr	al, 3 ; / 8
   891 0000188A 2C02                <1> 	sub	al, 2 ; - 2
   892                              <1> 	; al = 14 (if [CHAR_HEIGHT] = 16)
   893                              <1> csf_2:
   894 0000188C 880424              <1> 	mov	[esp], al
   895 0000188F 8A642401            <1> 	mov	ah, [esp+1]
   896                              <1> 	; CL = ((CL+1) * cheight / 8) - 1;
   897 00001893 FEC4                <1> 	inc	ah 
   898 00001895 A0[E6FB0000]        <1> 	mov	al, [CHAR_HEIGHT]
   899 0000189A F6E4                <1> 	mul	ah
   900 0000189C C0E803              <1> 	shr	al, 3 ; / 8
   901 0000189F FEC8                <1> 	dec	al ; - 1
   902 000018A1 88442401            <1> 	mov	[esp+1], al
   903                              <1> 	; ah = 15 (if [CHAR_HEIGHT] = 16)
   904                              <1> 	;
   905 000018A5 6658                <1> 	pop	ax
   906                              <1> csf_3:
   907 000018A7 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 000018A8 803D[E2FB0000]07    <1> 	cmp	byte [CRT_MODE], 7
   913 000018AF 0F8790FCFFFF        <1> 	ja	VIDEO_RETURN ; 12/09/2016
   914 000018B5 E805000000          <1> 	call	_set_ctype
   915 000018BA 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 000018BF 6689C8              <1> 	mov	ax, cx
   946 000018C2 86C4                <1> 	xchg	al, ah
   947                              <1> 	; AL = start line, AH = stop line
   948 000018C4 E88CFFFFFF          <1> 	call	cursor_shape_fix
   949                              <1> 	; AL = start line (fixed), AH = stop line (fixed)
   950 000018C9 6689C1              <1> 	mov	cx, ax
   951 000018CC 86E9                <1> 	xchg	ch, cl
   952                              <1> 	; CH = start line (fixed), CL = stop line (fixed)
   953                              <1> 	;
   954 000018CE B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
   955 000018D0 66890D[FBFB0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
   956                              <1> 	;call	m16	; output cx register
   957                              <1> 	;retn
   958 000018D7 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 000018DC 80FF07              <1> 	cmp	bh, 7 ; video page > 7 ; 07/07/2016
   965 000018DF 0F8760FCFFFF        <1> 	ja	VIDEO_RETURN
   966                              <1> 	;
   967 000018E5 803D[E2FB0000]07    <1> 	cmp	byte [CRT_MODE], 7
   968 000018EC 770A                <1> 	ja	short vga_set_cpos ; 12/09/2016	
   969 000018EE E846040000          <1> 	call	_set_cpos
   970 000018F3 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 000018F8 668915[C6330100]    <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 000018FF 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 00001904 80FF07              <1> 	cmp	bh, 7 ; video page > 7 (invalid)
  1012 00001907 7606                <1> 	jna	short read_cursor_1
  1013                              <1> 	; invalid video page (input) 
  1014 00001909 31C9                <1> 	xor	ecx, ecx ; 0
  1015 0000190B 31D2                <1> 	xor	edx, edx ; 0
  1016 0000190D EB15                <1> 	jmp	short read_cursor_2
  1017                              <1> read_cursor_1:
  1018                              <1> 	; 12/09/2016
  1019 0000190F 803D[E2FB0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; vga mode
  1020 00001916 7727                <1> 	ja	short vga_get_cpos
  1021                              <1> 	;
  1022 00001918 E815000000          <1> 	call	get_cpos
  1023 0000191D 0FB70D[FBFB0000]    <1> 	movzx	ecx, word [CURSOR_MODE]
  1024                              <1> read_cursor_2:
  1025 00001924 5D                  <1> 	pop	ebp
  1026 00001925 5F                  <1> 	pop	edi
  1027 00001926 5E                  <1> 	pop	esi
  1028 00001927 5B                  <1> 	pop	ebx
  1029 00001928 58                  <1> 	pop	eax  ; DISCARD SAVED CX AND DX
  1030 00001929 58                  <1> 	pop	eax
  1031 0000192A A1[34410100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
  1032                              <1> 	;;15/01/2017
  1033                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017
  1034 0000192F 1F                  <1> 	pop	ds
  1035 00001930 07                  <1> 	pop	es
  1036 00001931 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 00001932 D0E7                <1> 	shl	bh, 1 ; WORD OFFSET
  1044 00001934 0FB6F7              <1> 	movzx	esi, bh 
  1045 00001937 0FB796[C6330100]    <1> 	movzx	edx, word [esi+CURSOR_POSN]
  1046 0000193E C3                  <1> 	retn
  1047                              <1> 
  1048                              <1> vga_get_cpos:
  1049                              <1> 	; 12/09/2016
  1050                              <1> 	; get cursor position (vga)
  1051 0000193F 0FB715[C6330100]    <1> 	movzx	edx, word [CURSOR_POSN] ; cursor pos for pg 0
  1052 00001946 31C9                <1> 	xor	ecx, ecx ; Cursor Mode = 0 (invalid)
  1053 00001948 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 0000194A 3C07                <1> 	cmp	al, 7	; > 7 = invalid video page number
  1073 0000194C 0F87F3FBFFFF        <1> 	ja	VIDEO_RETURN
  1074 00001952 803D[E2FB0000]03    <1>         cmp     byte [CRT_MODE], 3
  1075 00001959 7408                <1> 	je	short adp_1
  1076 0000195B 20C0                <1> 	and 	al, al
  1077 0000195D 0F85E2FBFFFF        <1>         jnz     VIDEO_RETURN
  1078                              <1> 	;sub	al, al ; 0 ; force to page 0
  1079                              <1> adp_1:	
  1080 00001963 E805000000          <1> 	call	set_active_page
  1081 00001968 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 0000196D A2[D6330100]        <1> 	mov	[ACTIVE_PAGE], al ; save active page value ; [ptty]
  1093                              <1> _set_active_page:
  1094                              <1> 	; 27/06/2015
  1095 00001972 0FB6D8              <1> 	movzx	ebx, al
  1096                              <1> 	;
  1097 00001975 6698                <1> 	cbw	; 07/09/2014 (ah=0)
  1098 00001977 66F725[44410100]    <1> 	mul	word [CRT_LEN]  ; get saved length of regen buffer
  1099                              <1> 				; display page times regen length
  1100                              <1> 	; 10/12/2013
  1101 0000197E 66A3[C4330100]      <1> 	mov	[CRT_START], ax ; save start address for later
  1102 00001984 6689C1              <1> 	mov	cx, ax ; start address to cx
  1103                              <1> _M16:
  1104                              <1> 	;sar	cx, 1
  1105 00001987 66D1E9              <1> 	shr	cx, 1	; divide by 2 for 6845 handling
  1106 0000198A B40C                <1> 	mov	ah, 12	; 6845 register for start address
  1107 0000198C E8D3030000          <1> 	call	m16
  1108                              <1> 	;sal	bx, 1
  1109                              <1> 	; 01/09/2014
  1110 00001991 D0E3                <1> 	shl	bl, 1	; *2 for word offset
  1111 00001993 81C3[C6330100]      <1> 	add	ebx, CURSOR_POSN
  1112 00001999 668B13              <1> 	mov	dx, [ebx] ; get cursor for this page
  1113                              <1> 	; 16/01/2016
  1114                              <1> 	;call	m18
  1115                              <1> 	;retn
  1116 0000199C 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 000019A1 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS] ; 24/06/2016
  1140 000019A8 F6E6                <1> 	mul	dh	 ; row value
  1141 000019AA 30F6                <1> 	xor	dh, dh   ; 0	
  1142 000019AC 6601D0              <1> 	add	ax, dx	 ; add column value to the result
  1143 000019AF 66D1E0              <1> 	shl	ax, 1	; * 2 for attribute bytes
  1144                              <1> 		; EAX = AX = OFFSET OF CHAR POSITION IN REGEN BUFFER 
  1145 000019B2 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 000019B3 0FB6CF              <1> 	movzx	ecx, bh ; video page number
  1157 000019B6 89CE                <1> 	mov	esi, ecx
  1158 000019B8 66D1E6              <1> 	shl	si, 1
  1159 000019BB 668B96[C6330100]    <1> 	mov	dx, [esi+CURSOR_POSN]
  1160 000019C2 740C                <1> 	jz	short p21
  1161 000019C4 6631F6              <1> 	xor	si, si
  1162                              <1> p20:
  1163 000019C7 660335[44410100]    <1> 	add	si, [CRT_LEN] ; 24/06/2016
  1164                              <1> 	;add	si, 80*25*2 ; add length of buffer for one page		
  1165 000019CE E2F7                <1> 	loop	p20
  1166                              <1> p21:
  1167 000019D0 6621D2              <1> 	and	dx, dx
  1168 000019D3 7407                <1> 	jz	short p22
  1169 000019D5 E8C7FFFFFF          <1> 	call 	position ; determine location in regen in page
  1170 000019DA 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 000019DC 66BADA03            <1> 	mov	dx, 03DAh ; status port
  1176                              <1> 	; cx = 0
  1177 000019E0 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 000019E1 38F5                <1> 	cmp	ch, dh
  1211 000019E3 0F875CFBFFFF        <1> 	ja	VIDEO_RETURN
  1212 000019E9 38D1                <1> 	cmp	cl, dl
  1213 000019EB 0F8754FBFFFF        <1> 	ja	VIDEO_RETURN
  1214                              <1> 	;
  1215 000019F1 E805000000          <1> 	call	_scroll_up
  1216 000019F6 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 000019FB E896000000          <1> 	call	test_line_count ; 16/01/2016
  1230                              <1> 
  1231 00001A00 8A25[E2FB0000]      <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 00001A06 80FC04              <1>         cmp	ah, 4 ; 07/07/2016
  1236 00001A09 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 00001A0F 80FF07              <1> 	cmp	bh, 7 ; video page number
  1243 00001A12 7606                <1> 	jna	short n1
  1244 00001A14 8A3D[D6330100]      <1> 	mov	bh, [ACTIVE_PAGE]
  1245                              <1> n1:
  1246 00001A1A 88DC                <1> 	mov	ah, bl ; attribute
  1247 00001A1C 6650                <1> 	push	ax ; *
  1248                              <1> 	;mov 	esi, [CRT_BASE]
  1249 00001A1E BE00800B00          <1>         mov     esi, 0B8000h  
  1250 00001A23 3A3D[D6330100]      <1>         cmp     bh, [ACTIVE_PAGE]
  1251 00001A29 750B                <1> 	jne	short n2
  1252                              <1> 	;
  1253 00001A2B 66A1[C4330100]      <1>         mov     ax, [CRT_START]
  1254 00001A31 6601C6              <1>         add     si, ax
  1255 00001A34 EB11                <1>         jmp     short n4
  1256                              <1> n2:
  1257 00001A36 20FF                <1>         and     bh, bh
  1258 00001A38 740D                <1> 	jz	short n4
  1259 00001A3A 88F8                <1> 	mov	al, bh
  1260                              <1> n3:
  1261 00001A3C 660335[44410100]    <1>         add	si, [CRT_LEN]
  1262 00001A43 FEC8                <1>         dec	al
  1263 00001A45 75F5                <1> 	jnz	short n3
  1264                              <1> n4:	
  1265 00001A47 E85D000000          <1> 	call	scroll_position ; 16/01/2016
  1266 00001A4C 7420                <1>         jz      short n6 
  1267                              <1> 
  1268 00001A4E 01CE                <1>         add     esi, ecx ; from address for scroll
  1269 00001A50 88F5                <1> 	mov	ch, dh  ; #rows in block
  1270 00001A52 28C5                <1> 	sub	ch, al	; #rows to be moved
  1271                              <1> n5:
  1272 00001A54 E894000000          <1> 	call	n10 ; 16/01/2016
  1273                              <1> 	
  1274 00001A59 51                  <1>         push	ecx
  1275 00001A5A 0FB60D[E4FB0000]    <1> 	movzx	ecx, byte [CRT_COLS] 
  1276 00001A61 00C9                <1> 	add	cl, cl
  1277 00001A63 01CE                <1>         add	esi, ecx  ; next line
  1278 00001A65 01CF                <1>         add	edi, ecx
  1279 00001A67 59                  <1> 	pop	ecx
  1280                              <1> 
  1281 00001A68 FECD                <1> 	dec	ch	 ; count of lines to move
  1282 00001A6A 75E8                <1> 	jnz	short n5 ; row loop
  1283                              <1> 	; ch = 0
  1284 00001A6C 88C6                <1> 	mov	dh, al	 ; #rows	
  1285                              <1> n6:
  1286                              <1> 	; attribute in ah
  1287 00001A6E B020                <1> 	mov	al, ' '	 ; fill with blanks
  1288                              <1> n7:
  1289 00001A70 E885000000          <1> 	call	n11 ; 16/01/2016
  1290                              <1> 
  1291 00001A75 8A0D[E4FB0000]      <1> 	mov	cl, [CRT_COLS]
  1292 00001A7B 00C9                <1> 	add	cl, cl
  1293 00001A7D 01CF                <1>         add	edi, ecx
  1294                              <1> 
  1295 00001A7F FECE                <1> 	dec	dh
  1296 00001A81 75ED                <1> 	jnz	short n7
  1297                              <1> n16:
  1298 00001A83 3A3D[D6330100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  1299 00001A89 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 00001A8B A0[E3FB0000]        <1> 	mov	al, [CRT_MODE_SET] ; get the value of mode set
  1305 00001A90 66BAD803            <1> 	mov	dx, 03D8h ; always set color card port
  1306 00001A94 EE                  <1> 	out	dx, al
  1307                              <1> n8:
  1308 00001A95 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 00001A96 08C0                <1> 	or	al, al
  1315 00001A98 740E                <1> 	jz	short al_set2
  1316 00001A9A 6652                <1> 	push	dx
  1317 00001A9C 28EE                <1> 	sub	dh, ch  ; subtract upper row from lower row number
  1318 00001A9E FEC6                <1> 	inc	dh	; adjust difference by 1
  1319 00001AA0 38C6                <1> 	cmp	dh, al 	; line count = amount of rows in window?
  1320 00001AA2 7502                <1> 	jne	short al_set1 ; if not the we're all set
  1321 00001AA4 30C0                <1> 	xor	al, al	; otherwise set al to zero
  1322                              <1> al_set1:
  1323 00001AA6 665A                <1> 	pop	dx
  1324                              <1> al_set2:
  1325 00001AA8 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 00001AA9 6652                <1> 	push	dx
  1334 00001AAB 6689CA              <1> 	mov	dx, cx	; now, upper left position in DX
  1335 00001AAE E8EEFEFFFF          <1> 	call	position
  1336 00001AB3 01C6                <1> 	add	esi, eax
  1337 00001AB5 89F7                <1> 	mov	edi, esi
  1338 00001AB7 665A                <1> 	pop	dx	; lower right position in DX
  1339 00001AB9 6629CA              <1> 	sub	dx, cx
  1340 00001ABC FEC6                <1> 	inc	dh	; dh = #rows 
  1341 00001ABE FEC2                <1> 	inc	dl	; dl = #cols in block
  1342 00001AC0 59                  <1> 	pop	ecx 	; return address
  1343 00001AC1 6658                <1> 	pop	ax	; * ; al = line count, ah = attribute
  1344 00001AC3 51                  <1> 	push	ecx	; return address
  1345 00001AC4 0FB7C8              <1> 	movzx	ecx, ax
  1346 00001AC7 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS]
  1347 00001ACD F6E4                <1> 	mul	ah	; determine offset to from address
  1348 00001ACF 6601C0              <1> 	add	ax, ax  ; *2 for attribute byte
  1349                              <1> 	;
  1350 00001AD2 6650                <1> 	push	ax	; offset 
  1351 00001AD4 6652                <1> 	push	dx
  1352                              <1> 	;
  1353                              <1> 	; 04/04/2014
  1354 00001AD6 66BADA03            <1> 	mov	dx, 3DAh ; guaranteed to be color card here	
  1355                              <1> n9:                      ; wait_display_enable
  1356 00001ADA EC                  <1>         in      al, dx   ; get port
  1357 00001ADB A808                <1> 	test	al, RVRT ; wait for vertical retrace	
  1358 00001ADD 74FB                <1> 	jz	short n9 ; wait_display_enable
  1359 00001ADF B025                <1> 	mov	al, 25h
  1360 00001AE1 B2D8                <1> 	mov	dl, 0D8h ; address control port
  1361 00001AE3 EE                  <1> 	out	dx, al	; turn off video during vertical retrace
  1362 00001AE4 665A                <1> 	pop	dx	; #rows, #cols
  1363 00001AE6 6658                <1>        	pop	ax	; offset
  1364 00001AE8 6691                <1> 	xchg	ax, cx	; 
  1365                              <1> 	; ecx = offset, al = line count, ah = attribute
  1366                              <1> 	;
  1367 00001AEA 08C0                <1> 	or	al, al
  1368 00001AEC C3                  <1> 	retn
  1369                              <1> n10:
  1370                              <1> 	; Move rows
  1371 00001AED 88D1                <1> 	mov	cl, dl	; get # of cols to move
  1372 00001AEF 56                  <1> 	push	esi
  1373 00001AF0 57                  <1> 	push	edi	; save start address
  1374                              <1> n10r:
  1375 00001AF1 66A5                <1> 	movsw		; move that line on screen
  1376 00001AF3 FEC9                <1> 	dec	cl
  1377 00001AF5 75FA                <1>         jnz     short n10r
  1378 00001AF7 5F                  <1> 	pop	edi
  1379 00001AF8 5E                  <1> 	pop	esi	; recover addresses
  1380 00001AF9 C3                  <1> 	retn
  1381                              <1> n11:
  1382                              <1> 	; Clear rows
  1383                              <1>                 	; dh =  #rows
  1384 00001AFA 88D1                <1>         mov	cl, dl	; get # of cols to clear
  1385 00001AFC 57                  <1>         push    edi     ; save address
  1386                              <1> n11r:
  1387 00001AFD 66AB                <1>         stosw           ; store fill character
  1388 00001AFF FEC9                <1> 	dec	cl
  1389 00001B01 75FA                <1>         jnz     short n11r
  1390 00001B03 5F                  <1>         pop     edi     ; recover address
  1391 00001B04 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 00001B05 38F5                <1> 	cmp	ch, dh
  1421 00001B07 0F8738FAFFFF        <1> 	ja	VIDEO_RETURN
  1422 00001B0D 38D1                <1> 	cmp	cl, dl
  1423 00001B0F 0F8730FAFFFF        <1> 	ja	VIDEO_RETURN
  1424                              <1> 	;
  1425 00001B15 E805000000          <1> 	call	_scroll_down
  1426 00001B1A 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 00001B1F FD                  <1> 	std		; DIRECTION FOR SCROLL DOWN
  1441                              <1> 	; !!!!
  1442 00001B20 E871FFFFFF          <1> 	call	test_line_count ; 16/01/2016
  1443                              <1> 	
  1444 00001B25 8A25[E2FB0000]      <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 00001B2B 80FC04              <1>         cmp	ah, 4 ; 07/07/2016
  1449 00001B2E 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 00001B34 80FF07              <1> 	cmp	bh, 7 ; video page number
  1456 00001B37 7606                <1> 	jna	short n12
  1457 00001B39 8A3D[D6330100]      <1> 	mov	bh, [ACTIVE_PAGE]
  1458                              <1> 	;
  1459                              <1> n12:			; CONTINUE_DOWN
  1460 00001B3F 88DC                <1> 	mov	ah, bl
  1461 00001B41 6650                <1> 	push	ax	; * ; save attribute in ah
  1462 00001B43 6689D0              <1> 	mov	ax, dx	; LOWER RIGHT CORNER
  1463 00001B46 E85EFFFFFF          <1> 	call	scroll_position	; GET REGEN LOCATION
  1464 00001B4B 741F                <1> 	jz	short n14
  1465 00001B4D 29CE                <1> 	sub	esi, ecx  ; SI IS FROM ADDRESS
  1466 00001B4F 88F5                <1> 	mov	ch, dh  ; #rows in block
  1467 00001B51 28C5                <1> 	sub	ch, al	; #rows to be moved
  1468                              <1> n13:
  1469 00001B53 E895FFFFFF          <1> 	call	n10	; MOVE ONE ROW
  1470                              <1> 
  1471 00001B58 51                  <1> 	push	ecx
  1472 00001B59 8A0D[E4FB0000]      <1> 	mov	cl, [CRT_COLS] 
  1473 00001B5F 00C9                <1> 	add	cl, cl
  1474 00001B61 29CE                <1>         sub	esi, ecx  ; next line
  1475 00001B63 29CF                <1>         sub	edi, ecx
  1476 00001B65 59                  <1>         pop	ecx
  1477                              <1> 	
  1478 00001B66 FECD                <1> 	dec	ch	 ; count of lines to move
  1479 00001B68 75E9                <1> 	jnz	short n13 ; row loop
  1480                              <1> 	; ch = 0
  1481 00001B6A 88C6                <1> 	mov	dh, al	 ; #rows
  1482                              <1> n14:
  1483                              <1> 	; attribute in ah
  1484 00001B6C B020                <1> 	mov	al, ' '	 ; fill with blanks
  1485                              <1> n15:
  1486 00001B6E E887FFFFFF          <1> 	call	n11 ; 16/01/2016
  1487                              <1> 
  1488 00001B73 8A0D[E4FB0000]      <1> 	mov	cl, [CRT_COLS]
  1489 00001B79 00C9                <1> 	add	cl, cl
  1490 00001B7B 29CF                <1>         sub	edi, ecx
  1491                              <1>         
  1492 00001B7D FECE                <1> 	dec	dh
  1493 00001B7F 75ED                <1> 	jnz	short n15
  1494                              <1> 	;
  1495 00001B81 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 00001B86 803D[E2FB0000]07    <1>         cmp     byte [CRT_MODE], 7 ; 6!?
  1523 00001B8D 7607                <1> 	jna	short read_ac_c
  1524 00001B8F 31C0                <1> 	xor	eax, eax
  1525 00001B91 E9B4F9FFFF          <1>         jmp     _video_return 
  1526                              <1> read_ac_c:
  1527 00001B96 E805000000          <1> 	call	_read_ac_current
  1528                              <1> 	; 12/05/2016
  1529                              <1>         ;jmp     VIDEO_RETURN
  1530 00001B9B 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 00001BA0 803D[E2FB0000]04    <1> 	cmp	byte [CRT_MODE], 4
  1555 00001BA7 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 00001BAD 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 00001BB2 8A25[E2FB0000]      <1> 	mov	ah, [CRT_MODE]	
  1566 00001BB8 80EC02              <1> 	sub	ah, 2
  1567 00001BBB D0EC                <1> 	shr	ah, 1
  1568 00001BBD 7515                <1> 	jnz	short p13
  1569                              <1> 
  1570                              <1> 	; WAIT FOR HORIZONTAL RETRACE OR VERTICAL RETRACE IF COLOR 80
  1571                              <1> p11:
  1572 00001BBF FB                  <1> 	sti		; enable interrupts first
  1573 00001BC0 3A3D[D6330100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  1574 00001BC6 750C                <1> 	jne	short p13 
  1575 00001BC8 FA                  <1> 	cli 		; block interrupts for single loop
  1576 00001BC9 EC                  <1> 	in	al, dx	; get status from the adapter
  1577 00001BCA A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  1578 00001BCC 75F1                <1> 	jnz	short p11 ; wait until it is
  1579                              <1> p12:			;  wait for either retrace high
  1580 00001BCE EC                  <1> 	in	al, dx ; get status again
  1581 00001BCF A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  1582 00001BD1 74FB                <1> 	jz	short p12 ; wait until either retrace active
  1583 00001BD3 FB                  <1> 	sti
  1584                              <1> p13:
  1585 00001BD4 81C600800B00        <1> 	add	esi, 0B8000h 
  1586 00001BDA 668B06              <1> 	mov	ax, [esi]
  1587                              <1> 
  1588 00001BDD 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 00001BDE 803D[E2FB0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  1617 00001BE5 760A                <1> 	jna	short write_ac_c
  1618                              <1> 
  1619 00001BE7 E8F20A0000          <1> 	call	vga_write_char_attr
  1620 00001BEC E954F9FFFF          <1> 	jmp     VIDEO_RETURN	
  1621                              <1> 
  1622                              <1> write_ac_c:
  1623 00001BF1 E834000000          <1> 	call	_write_c_current
  1624                              <1> 
  1625 00001BF6 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  1626 00001BF9 889E[EBFB0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  1627                              <1> 
  1628 00001BFF 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 00001C04 803D[E2FB0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  1655 00001C0B 760A                <1> 	jna	short write_c_c
  1656                              <1> 
  1657 00001C0D E8CC0A0000          <1> 	call	vga_write_char_only
  1658 00001C12 E92EF9FFFF          <1> 	jmp     VIDEO_RETURN	
  1659                              <1> 
  1660                              <1> write_c_c:
  1661                              <1> 	;and	bh, 7 ; video page number (<= 7)
  1662 00001C17 0FB6F7              <1> 	movzx	esi, bh	
  1663 00001C1A 8A9E[EBFB0000]      <1> 	mov	bl, [esi+chr_attrib]
  1664                              <1> 
  1665 00001C20 E805000000          <1> 	call	_write_c_current
  1666 00001C25 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 00001C2A 803D[E2FB0000]04    <1> 	cmp	byte [CRT_MODE], 4
  1683 00001C31 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 00001C37 6652                <1> 	push	dx
  1693 00001C39 88DC                <1> 	mov	ah, bl  ; color/attribute (12/05/2016)
  1694 00001C3B 6650                <1> 	push	ax	; save character & attribute/color
  1695 00001C3D 6651                <1> 	push	cx
  1696 00001C3F E86FFDFFFF          <1> 	call 	find_position  ; get regen location and port address
  1697 00001C44 6659                <1> 	pop	cx
  1698                              <1> 	; esi = regen location
  1699                              <1> 	; dx = status port
  1700                              <1> 	;
  1701 00001C46 81C600800B00        <1> 	add	esi, 0B8000h ; 30/08/2014 (crt_base) 
  1702                              <1> 	;
  1703 00001C4C 8A25[E2FB0000]      <1> 	mov	ah, [CRT_MODE]	
  1704 00001C52 80EC02              <1> 	sub	ah, 2
  1705 00001C55 D0EC                <1> 	shr	ah, 1
  1706 00001C57 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 00001C59 FB                  <1> 	sti		; enable interrupts first
  1711 00001C5A 3A3D[D6330100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  1712 00001C60 7510                <1> 	jne	short p44 
  1713 00001C62 FA                  <1> 	cli 		; block interrupts for single loop
  1714 00001C63 EC                  <1> 	in	al, dx	; get status from the adapter
  1715 00001C64 A808                <1> 	test	al, RVRT ; check for vertical retrace first
  1716 00001C66 7509                <1> 	jnz	short p43 ; Do fast write now if vertical retrace
  1717 00001C68 A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  1718 00001C6A 75ED                <1> 	jnz	short p41 ; wait until it is
  1719                              <1> p42:			;  wait for either retrace high
  1720 00001C6C EC                  <1> 	in	al, dx ; get status again
  1721 00001C6D A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  1722 00001C6F 74FB                <1> 	jz	short p42 ; wait until either retrace active
  1723                              <1> p43:	
  1724 00001C71 FB                  <1> 	sti
  1725                              <1> p44:
  1726 00001C72 668B0424            <1> 	mov	ax, [esp] ; restore the character (al) & attribute (ah)
  1727 00001C76 668906              <1> 	mov	[esi], ax
  1728                              <1> 
  1729 00001C79 6649                <1> 	dec	cx
  1730 00001C7B 7404                <1> 	jz	short p45
  1731                              <1> 
  1732 00001C7D 46                  <1> 	inc	esi
  1733 00001C7E 46                  <1> 	inc	esi
  1734 00001C7F EBD8                <1> 	jmp	short p41
  1735                              <1> p45:	
  1736 00001C81 6658                <1> 	pop	ax
  1737 00001C83 665A                <1> 	pop	dx
  1738 00001C85 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 00001C86 803D[E2FB0000]07    <1>         cmp     byte [CRT_MODE], 7
  1777 00001C8D 760A                <1> 	jna 	short write_tty_cga
  1778                              <1> 
  1779 00001C8F E8290D0000          <1> 	call	vga_write_teletype
  1780 00001C94 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 00001C99 E818000000          <1> 	call	_write_tty_m3
  1787 00001C9E 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 00001CA3 FA                  <1> 	cli
  1825                              <1> 	;
  1826                              <1> 	; 01/09/2014
  1827 00001CA4 803D[E2FB0000]03    <1> 	cmp	byte [CRT_MODE], 3
  1828 00001CAB 7409                <1> 	je	short _write_tty_m3
  1829                              <1> 	;
  1830                              <1> set_mode_3:
  1831 00001CAD 53                  <1> 	push	ebx
  1832 00001CAE 50                  <1> 	push	eax
  1833 00001CAF E8A2F8FFFF          <1> 	call	_set_mode
  1834 00001CB4 58                  <1> 	pop	eax
  1835 00001CB5 5B                  <1> 	pop	ebx
  1836                              <1> 	;
  1837                              <1> _write_tty_m3: ; 24/06/2016 (m3 -> _write_tty_m3)
  1838 00001CB6 0FB6F7              <1> 	movzx 	esi, bh ; 12/05/2016
  1839 00001CB9 66D1E6              <1> 	shl	si, 1
  1840 00001CBC 81C6[C6330100]      <1> 	add	esi, CURSOR_POSN
  1841 00001CC2 668B16              <1> 	mov	dx, [esi]
  1842                              <1> 	;
  1843                              <1> 	; dx now has the current cursor position
  1844                              <1> 	;
  1845 00001CC5 3C0D                <1> 	cmp	al, 0Dh	; CR	; is it carriage return or control character
  1846 00001CC7 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 00001CC9 66B90100            <1> 	mov	cx, 1  ; 24/06/2016
  1855                              <1> 	; cx = count of characters to write
  1856                              <1> 	;
  1857 00001CCD E858FFFFFF          <1> 	call	_write_c_current ; 16/01/2015
  1858                              <1> 	;
  1859                              <1> 	; position the cursor for next char
  1860 00001CD2 FEC2                <1> 	inc	dl		; next column
  1861 00001CD4 3A15[E4FB0000]      <1> 	cmp	dl, [CRT_COLS]  ; test for column overflow 
  1862 00001CDA 755D                <1>         jne     _set_cpos
  1863 00001CDC B200                <1> 	mov	dl, 0		; column = 0
  1864                              <1> u10:				; (line feed found)
  1865 00001CDE 80FE18              <1> 	cmp	dh, 25-1 	; check for last row
  1866 00001CE1 7218                <1> 	jb 	short u6
  1867                              <1> 	;
  1868                              <1> 	; scroll required
  1869                              <1> u1:	
  1870                              <1> 	; SET CURSOR POSITION (04/12/2013)
  1871 00001CE3 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 00001CE8 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 00001CED 6629C9              <1> 	sub	cx, cx
  1897 00001CF0 66BA4F18            <1> 	mov	dx, 184Fh ; dl = 79 (column), dh = 24 (row)
  1898                              <1> 	;
  1899 00001CF4 B001                <1> 	mov	al, 1		; scroll 1 line up
  1900                              <1> 		; ah = attribute
  1901                              <1> 	;mov	bl, al ; 12/05/2016
  1902 00001CF6 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 00001CFB 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 00001CFD EB3A                <1> 	jmp     _set_cpos
  1919                              <1> 
  1920                              <1> 	; check for control characters
  1921                              <1> u8:
  1922 00001CFF 7436                <1> 	je	short u9
  1923 00001D01 3C0A                <1> 	cmp	al, 0Ah		; is it a line feed (0Ah)
  1924 00001D03 74D9                <1> 	je	short u10
  1925 00001D05 3C07                <1> 	cmp	al, 07h 	; is it a bell
  1926 00001D07 747A                <1> 	je	short u11
  1927 00001D09 3C08                <1> 	cmp	al, 08h		; is it a backspace
  1928                              <1> 	;jne	short u0
  1929 00001D0B 7422                <1> 	je	short bs	; 12/12/2013
  1930                              <1> 	; 12/12/2013 (tab stop)
  1931 00001D0D 3C09                <1> 	cmp	al, 09h		; is it a tab stop
  1932 00001D0F 75B8                <1> 	jne	short u0
  1933 00001D11 88D0                <1> 	mov	al, dl
  1934 00001D13 6698                <1> 	cbw
  1935 00001D15 B108                <1> 	mov	cl, 8
  1936 00001D17 F6F1                <1> 	div	cl
  1937 00001D19 28E1                <1> 	sub	cl, ah
  1938                              <1> ts:
  1939                              <1> 	; 02/09/2014
  1940                              <1> 	; 01/09/2014
  1941 00001D1B B020                <1> 	mov	al, 20h
  1942                              <1> tsloop:
  1943 00001D1D 6651                <1> 	push	cx
  1944 00001D1F 6650                <1> 	push	ax
  1945                              <1> 	;mov	bh, [ACTIVE_PAGE]
  1946 00001D21 E890FFFFFF          <1> 	call	_write_tty_m3 ; 24/06/2016 (m3 -> _write_tty_m3)
  1947 00001D26 6658                <1> 	pop	ax  ; ah = attribute/color
  1948 00001D28 6659                <1> 	pop	cx
  1949 00001D2A FEC9                <1> 	dec	cl
  1950 00001D2C 75EF                <1> 	jnz	short tsloop
  1951 00001D2E C3                  <1> 	retn
  1952                              <1> bs:	
  1953                              <1> 	; back space found
  1954                              <1> 
  1955 00001D2F 08D2                <1> 	or	dl, dl 		; is it already at start of line
  1956                              <1> 	;je	short u7 	; set_cursor
  1957 00001D31 7406                <1> 	jz	short _set_cpos
  1958 00001D33 664A                <1> 	dec	dx     		; no -- just move it back
  1959                              <1> 	;jmp	short u7
  1960 00001D35 EB02                <1> 	jmp	short _set_cpos
  1961                              <1> 
  1962                              <1> 	; carriage return found
  1963                              <1> u9:
  1964 00001D37 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 00001D39 BE[C6330100]        <1> 	mov	esi, CURSOR_POSN
  1996 00001D3E 0FB6C7              <1>         movzx   eax, bh	; BH = video page number
  1997                              <1> ;	or	al, al
  1998                              <1> ;	jz	short _set_cpos_0
  1999 00001D41 D0E0                <1>         shl     al, 1   ; word offset
  2000 00001D43 01C6                <1>         add     esi, eax
  2001                              <1> ;_set_cpos_0:
  2002 00001D45 668916              <1> 	mov	[esi], dx ; save the pointer
  2003 00001D48 383D[D6330100]      <1> 	cmp	[ACTIVE_PAGE], bh
  2004 00001D4E 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 00001D50 E84CFCFFFF          <1> 	call	position ; determine location in regen buffer	
  2012 00001D55 668B0D[C4330100]    <1> 	mov	cx, [CRT_START]
  2013 00001D5C 6601C1              <1> 	add	cx, ax  ; add char position in regen buffer
  2014                              <1> 			; to the start address (offset) for this page
  2015 00001D5F 66D1E9              <1> 	shr	cx, 1	; divide by 2 for char only count
  2016 00001D62 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 00001D64 FA                  <1> 	cli
  2024                              <1> 	;mov	dx, [addr_6845] ; address register
  2025 00001D65 66BAD403            <1> 	mov 	dx, 03D4h ; I/O address of color card
  2026 00001D69 88E0                <1> 	mov	al, ah	; get value
  2027 00001D6B EE                  <1> 	out	dx, al	; register set
  2028 00001D6C 6642                <1> 	inc	dx	; data register
  2029 00001D6E EB00                <1> 	jmp	$+2	; i/o delay
  2030 00001D70 88E8                <1> 	mov	al, ch	; data
  2031 00001D72 EE                  <1> 	out	dx, al	
  2032 00001D73 664A                <1> 	dec	dx	
  2033 00001D75 88E0                <1> 	mov	al, ah
  2034 00001D77 FEC0                <1> 	inc	al	; point to other data register
  2035 00001D79 EE                  <1> 	out	dx, al	; set for second register
  2036 00001D7A 6642                <1> 	inc	dx
  2037 00001D7C EB00                <1> 	jmp	$+2	; i/o delay
  2038 00001D7E 88C8                <1> 	mov	al, cl	; second data value
  2039 00001D80 EE                  <1> 	out	dx, al
  2040 00001D81 FB                  <1> 	sti
  2041                              <1> m17:
  2042 00001D82 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 00001D83 FB                  <1> 	sti
  2053 00001D84 3A3D[D6330100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  2054 00001D8A 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 00001D8C 66B93305            <1> 	mov	cx, 1331 	; divisor for 896 hz tone
  2058 00001D90 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 00001D92 9C                  <1> 	pushf  ; 18/01/2014	; save interrupt status
  2085 00001D93 FA                  <1> 	cli			; block interrupts during update
  2086 00001D94 B0B6                <1> 	mov	al, 10110110b	; select timer 2, lsb, msb binary
  2087 00001D96 E643                <1> 	out	TIMER+3, al 	; write timer mode register
  2088 00001D98 EB00                <1> 	jmp	$+2		; I/O delay
  2089 00001D9A 88C8                <1> 	mov	al, cl		; divisor for hz (low)
  2090 00001D9C E642                <1> 	out	TIMER+2,AL	; write timer 2 count - lsb
  2091 00001D9E EB00                <1> 	jmp	$+2		; I/O delay
  2092 00001DA0 88E8                <1> 	mov	al, ch		; divisor for hz (high)
  2093 00001DA2 E642                <1> 	out	TIMER+2, al	; write timer 2 count - msb
  2094 00001DA4 E461                <1> 	in	al, PORT_B	; get current setting of port
  2095 00001DA6 88C4                <1> 	mov	ah, al		; save that setting
  2096 00001DA8 0C03                <1> 	or	al, GATE2+SPK2	; gate timer 2 and turn speaker on
  2097 00001DAA E661                <1> 	out	PORT_B, al	; and restore interrupt status
  2098                              <1> 	;popf	; 18/01/2014
  2099 00001DAC FB                  <1> 	sti
  2100                              <1> g7:				; 1/64 second per count (bl)
  2101 00001DAD B90B040000          <1> 	mov	ecx, 1035	; delay count for 1/64 of a second	
  2102 00001DB2 E827000000          <1> 	call	waitf		; go to beep delay 1/64 count
  2103 00001DB7 FECB                <1> 	dec	bl		; (bl) length count expired?
  2104 00001DB9 75F2                <1> 	jnz	short g7	; no - continue beeping speaker
  2105                              <1> 	;
  2106                              <1> 	;pushf			; save interrupt status
  2107 00001DBB FA                  <1> 	cli  	; 18/01/2014	; block interrupts during update
  2108 00001DBC E461                <1> 	in	al, PORT_B	; get current port value
  2109                              <1>         ;or      al, not (GATE2+SPK2) ; isolate current speaker bits in case
  2110 00001DBE 0CFC                <1>         or      al, ~(GATE2+SPK2)
  2111 00001DC0 20C4                <1>         and	ah, al		; someone turned them off during beep
  2112 00001DC2 88E0                <1> 	mov	al, ah		; recover value of port
  2113                              <1>         ;or      al, not (GATE2+SPK2) ; force speaker data off
  2114 00001DC4 0CFC                <1> 	or 	al, ~(GATE2+SPK2) ; isolate current speaker bits in case
  2115 00001DC6 E661                <1> 	out	PORT_B, al	; and stop speaker timer
  2116                              <1> 	;popf			; restore interrupt flag state
  2117 00001DC8 FB                  <1> 	sti
  2118 00001DC9 B90B040000          <1> 	mov	ecx, 1035	; force 1/64 second delay (short)
  2119 00001DCE E80B000000          <1> 	call	waitf		; minimum delay between all beeps
  2120                              <1> 	;pushf			; save interrupt status
  2121 00001DD3 FA                  <1> 	cli			; block interrupts during update
  2122 00001DD4 E461                <1> 	in	al, PORT_B	; get current port value in case	
  2123 00001DD6 2403                <1> 	and	al, GATE2+SPK2	; someone turned them on
  2124 00001DD8 08E0                <1> 	or	al, ah		; recover value of port_b
  2125 00001DDA E661                <1> 	out	PORT_B, al	; restore speaker status
  2126 00001DDC 9D                  <1> 	popf			; restore interrupt flag state
  2127                              <1> u12:	
  2128 00001DDD 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 00001DDE 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 00001DE0 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 00001DE2 E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  2192 00001DE4 A810                <1> 	TEST	AL,010H
  2193 00001DE6 74FA                <1> 	JZ	SHORT WR_STATE_0
  2194                              <1> WR_STATE_1:
  2195 00001DE8 E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  2196 00001DEA A810                <1> 	TEST	AL,010H
  2197 00001DEC 75FA                <1> 	JNZ	SHORT WR_STATE_1
  2198 00001DEE E2F2                <1>         LOOP    WR_STATE_0
  2199                              <1> 	;
  2200 00001DF0 6658                <1> 	POP	AX			; RESTORE (AH)
  2201 00001DF2 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 00001DF3 A2[40410100]        <1> 	mov	[w_str_cmd], al		; save (AL) command
  2234 00001DF8 3C04                <1> 	CMP	AL, 4			; TEST FOR INVALID WRITE STRING OPTION
  2235 00001DFA 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 00001E00 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 00001E03 89EE                <1> 	mov	esi, ebp ; user buffer
  2247 00001E05 BF00000700          <1> 	mov	edi, Cluster_Buffer  ; system buffer
  2248 00001E0A E8DBC20000          <1> 	call	transfer_from_user_buffer
  2249                              <1> 	;pop	ecx
  2250 00001E0F 0F8230F7FFFF        <1> 	jc	VIDEO_RETURN
  2251                              <1> 	; ecx = transfer (byte) count = character count
  2252 00001E15 BD00000700          <1> 	mov	ebp, Cluster_Buffer
  2253                              <1> 	; 12/09/2016
  2254 00001E1A 803D[E2FB0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6?!
  2255 00001E21 0F879F000000        <1> 	ja	vga_write_string
  2256                              <1> 	;
  2257 00001E27 0FB6F7              <1> 	movzx	esi, bh			; GET CURRENT CURSOR PAGE
  2258 00001E2A 66D1E6              <1> 	SAL	SI,1			; CONVERT TO PAGE OFFSET  (SI= PAGE)
  2259                              <1> 	; *****
  2260 00001E2D 66FFB6[C6330100]    <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 00001E34 53                  <1> 	push	ebx ; ****
  2266 00001E35 51                  <1> 	push	ecx ; ***
  2267 00001E36 56                  <1> 	push	esi ; **
  2268 00001E37 52                  <1> 	push	edx ; *
  2269 00001E38 E8FCFEFFFF          <1> 	call	_set_cpos
  2270                              <1> P50:
  2271 00001E3D 8A4500              <1> 	MOV	AL, [eBP]		; GET CHARACTER FROM INPUT STRING
  2272 00001E40 45                  <1> 	INC	eBP			; BUMP POINTER TO CHARACTER
  2273                              <1> 
  2274                              <1> ;-----	TEST FOR SPECIAL CHARACTER'S
  2275                              <1> 
  2276 00001E41 3C08                <1> 	CMP	AL, 08H			; IS IT A BACKSPACE
  2277 00001E43 740C                <1> 	JE	short P51		; BACK_SPACE
  2278 00001E45 3C0D                <1> 	CMP	AL, 0Dh ; CR		; IS IT CARRIAGE RETURN
  2279 00001E47 7408                <1> 	JE	short P51		; CAR_RET
  2280 00001E49 3C0A                <1> 	CMP	AL, 0Ah ; LF		; IS IT A LINE FEED
  2281 00001E4B 7404                <1> 	JE	short P51		; LINE_FEED
  2282 00001E4D 3C07                <1> 	CMP	AL, 07h			; IS IT A BELL
  2283 00001E4F 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 00001E51 E860FEFFFF          <1> 	call	_write_tty_m3
  2289                              <1> 
  2290 00001E56 5A                  <1> 	pop	edx ; *
  2291 00001E57 5E                  <1> 	pop	esi ; **
  2292                              <1> 
  2293 00001E58 668B96[C6330100]    <1> 	MOV	DX, [eSI+CURSOR_POSN]	; GET CURRENT CURSOR POSITION
  2294 00001E5F EB46                <1> 	JMP	SHORT P54		; SET CURSOR POSITION AND CONTINUE
  2295                              <1> P55:
  2296 00001E61 E9DFF6FFFF          <1> 	JMP	VIDEO_RETURN
  2297                              <1> P52:
  2298 00001E66 66B90100            <1> 	MOV	CX, 1			; SET CHARACTER WRITE AMOUNT TO ONE
  2299 00001E6A 803D[40410100]02    <1> 	CMP	byte [w_str_cmd], 2	; IS THE ATTRIBUTE IN THE STRING
  2300 00001E71 7204                <1> 	JB	short P53		; IF NOT THEN SKIP
  2301 00001E73 8A5D00              <1> 	MOV	BL, [eBP]		; ELSE GET NEW ATTRIBUTE
  2302 00001E76 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 00001E77 E8AEFDFFFF          <1> 	call	_write_c_current
  2308                              <1> 	
  2309 00001E7C 5A                  <1> 	pop	edx ; *	
  2310                              <1> 	
  2311 00001E7D 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  2312 00001E80 889E[EBFB0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  2313                              <1> 
  2314 00001E86 FEC2                <1> 	INC	DL			; INCREMENT COLUMN COUNTER
  2315 00001E88 3A15[E4FB0000]      <1> 	CMP	DL, [CRT_COLS]		; IF COLS ARE WITHIN RANGE FOR THIS MODE
  2316 00001E8E 7217                <1> 	JB	short P54		;    THEN GO TO COLUMNS SET
  2317 00001E90 FEC6                <1> 	INC	DH			; BUMP ROW COUNTER BY ONE
  2318 00001E92 28D2                <1> 	SUB	DL, DL			; SET COLUMN COUNTER TO ZERO
  2319 00001E94 80FE19              <1> 	CMP	DH, 25			; IF ROWS ARE LESS THAN 25 THEN
  2320 00001E97 720E                <1> 	JB	short P54		; GO TO ROWS_COLUMNS_SET
  2321                              <1> 
  2322 00001E99 66B80A0E            <1> 	MOV	AX,0E0AH		; ELSE SCROLL SCREEN
  2323                              <1> 	;INT	10H			; RESET ROW COUNTER TO 24
  2324                              <1> 
  2325 00001E9D E814FEFFFF          <1> 	call	_write_tty_m3
  2326                              <1> 	
  2327 00001EA2 66BA0018            <1> 	mov	dx, 1800h		; Column = 0, Row = 24
  2328 00001EA6 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 00001EA7 59                  <1> 	pop	ecx ; ***
  2335 00001EA8 5B                  <1> 	pop	ebx ; ****
  2336                              <1> 
  2337                              <1> 	;LOOP	P50			; DO IT ONCE MORE UNTIL (CX) = ZERO
  2338 00001EA9 6649                <1> 	dec	cx
  2339 00001EAB 7587                <1> 	jnz	short P50next
  2340                              <1> 
  2341 00001EAD 665A                <1> 	POP	DX  ; *****		; RESTORE OLD CURSOR COORDINATES
  2342                              <1> 	
  2343 00001EAF F605[40410100]01    <1> 	test	byte [w_str_cmd], 1	; IF CURSOR WAS NOT TO BE MOVED
  2344 00001EB6 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 00001EBC E878FEFFFF          <1> 	call	_set_cpos
  2350 00001EC1 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 00001EC6 80FEFF              <1> 	cmp	dh, 0FFh
  2393 00001EC9 7407                <1> 	je	short vga_wstr_1 ; user current cursor position
  2394                              <1> vga_wstr_0:
  2395                              <1> 	; set cursor position
  2396 00001ECB 668915[C6330100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  2397                              <1> vga_wstr_1:
  2398 00001ED2 66FF35[C6330100]    <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 00001ED9 F605[40410100]02    <1> 	test	byte [w_str_cmd], 2
  2413 00001EE0 751D                <1> 	jnz	short vga_wstr_3
  2414 00001EE2 881D[D7330100]      <1> 	mov	[ccolor], bl
  2415                              <1> vga_wstr_2:
  2416 00001EE8 51                  <1> 	push	ecx
  2417 00001EE9 8A4500              <1> 	mov	al, [ebp]
  2418 00001EEC E8CC0A0000          <1> 	call	vga_write_teletype
  2419 00001EF1 59                  <1> 	pop	ecx
  2420 00001EF2 6649                <1> 	dec	cx
  2421 00001EF4 741E                <1> 	jz	short vga_wstr_4
  2422 00001EF6 45                  <1> 	inc	ebp
  2423 00001EF7 8A1D[D7330100]      <1> 	mov	bl, [ccolor]
  2424 00001EFD EBE9                <1> 	jmp	short vga_wstr_2
  2425                              <1> vga_wstr_3:
  2426 00001EFF 51                  <1> 	push	ecx
  2427 00001F00 8A4500              <1> 	mov	al, [ebp]
  2428 00001F03 45                  <1> 	inc	ebp
  2429 00001F04 8A5D00              <1> 	mov	bl, [ebp]
  2430 00001F07 E8B10A0000          <1> 	call	vga_write_teletype
  2431 00001F0C 59                  <1> 	pop	ecx
  2432 00001F0D 6649                <1> 	dec	cx
  2433 00001F0F 7403                <1> 	jz	short vga_wstr_4
  2434 00001F11 45                  <1> 	inc	ebp
  2435 00001F12 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 00001F14 665A                <1> 	pop	dx ; word [CURSOR_POSN] ; *
  2443                              <1> 	;test	al, 1
  2444 00001F16 F605[40410100]01    <1> 	test	byte [w_str_cmd], 1
  2445 00001F1D 0F8522F6FFFF        <1> 	jnz	VIDEO_RETURN
  2446 00001F23 668915[C6330100]    <1> 	mov 	[CURSOR_POSN], dx
  2447 00001F2A 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 00001F2F 80FC07              <1> 	cmp	ah, 7
  2480 00001F32 7766                <1> 	ja	short vga_graphics_up
  2481                              <1> 	;je	n0
  2482                              <1> 
  2483 00001F34 88C7                <1> 	MOV	bh, al			; save line count in BH
  2484 00001F36 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 00001F39 E8D9050000          <1> 	CALL	GRAPH_POSN
  2490 00001F3E 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  2491                              <1> 
  2492                              <1> ;-----	DETERMINE SIZE OF WINDOW
  2493                              <1> 
  2494 00001F41 6629CA              <1> 	SUB	DX, CX
  2495 00001F44 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  2496 00001F49 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 00001F4C 803D[E2FB0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  2501 00001F53 7305                <1>         JNC     short _R7_              ; FIND_SOURCE
  2502                              <1> 
  2503                              <1> ;-----	MEDIUM RES UP
  2504 00001F55 D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  2505 00001F57 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 00001F5A 81C700800B00        <1> 	add	edi, 0B8000h
  2510 00001F60 C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  2511 00001F63 7431                <1>         JZ      short _R11              ; IF ZERO, THEN BLANK ENTIRE FIELD
  2512 00001F65 B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  2513 00001F67 F6E7                <1> 	mul	bh			; determine offset to source
  2514 00001F69 0FB7F0              <1> 	movzx	esi, ax			; offset to source
  2515 00001F6C 01FE                <1> 	add	eSI, eDI		; SET UP SOURCE
  2516 00001F6E 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  2517 00001F70 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 00001F72 E812040000          <1>         CALL    _R17                    ; MOVE ONE ROW
  2522 00001F77 6681EEB01F          <1> 	SUB	SI, 2000h-80		; MOVE TO NEXT ROW
  2523 00001F7C 6681EFB01F          <1> 	SUB	DI, 2000h-80
  2524 00001F81 FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  2525 00001F83 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 00001F85 88D8                <1> 	mov	al, bl			; attribute to fill with
  2530                              <1> _R10_:
  2531 00001F87 E819040000          <1>         CALL    _R18                    ; CLEAR THAT ROW
  2532 00001F8C 6681EFB01F          <1> 	SUB	DI, 2000h-80		; POINT TO NEXT LINE
  2533 00001F91 FECF                <1> 	dec	bh			; number of lines to fill
  2534 00001F93 75F2                <1>         JNZ     short _R10_             ; CLEAR LOOP
  2535 00001F95 C3                  <1> 	retn				; EVERYYHING DONE
  2536                              <1> 
  2537                              <1> _R11:                                   ; BLANK_FIELD
  2538 00001F96 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  2539 00001F98 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 00001F9A 88C7                <1> 	mov	bh, al ; 31/07/2016
  2567 00001F9C BE[06FC0000]        <1> 	mov	esi, vga_g_modes
  2568 00001FA1 89F7                <1> 	mov	edi, esi
  2569 00001FA3 83C708              <1> 	add	edi, vga_g_mode_count
  2570                              <1> vga_g_up_0:
  2571 00001FA6 AC                  <1> 	lodsb
  2572 00001FA7 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  2573 00001FA9 7405                <1> 	je	short vga_g_up_1
  2574 00001FAB 39FE                <1> 	cmp	esi, edi
  2575 00001FAD 72F7                <1> 	jb	short vga_g_up_0
  2576                              <1> 	;xor	bh, bh ; 31/07/2016)
  2577 00001FAF C3                  <1> 	retn	; nothing to do
  2578                              <1> vga_g_up_1:
  2579 00001FB0 88F8                <1> 	mov	al, bh ; 31/07/2016
  2580 00001FB2 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 00001FB5 3A35[EAFB0000]      <1> 	cmp	dh, [VGA_ROWS]
  2589 00001FBB 7208                <1> 	jb	short vga_g_up_2
  2590 00001FBD 8A35[EAFB0000]      <1> 	mov	dh, [VGA_ROWS]
  2591 00001FC3 FECE                <1> 	dec	dh
  2592                              <1> vga_g_up_2:
  2593 00001FC5 3A15[E4FB0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  2594 00001FCB 7208                <1> 	jb	short vga_g_up_3
  2595 00001FCD 8A15[E4FB0000]      <1> 	mov	dl, [CRT_COLS]
  2596 00001FD3 FECA                <1> 	dec	dl
  2597                              <1> vga_g_up_3:	
  2598 00001FD5 3A05[EAFB0000]      <1> 	cmp	al, [VGA_ROWS]
  2599 00001FDB 7602                <1> 	jna	short vga_g_up_4
  2600 00001FDD 28C0                <1> 	sub	al, al ; 0
  2601                              <1> vga_g_up_4:
  2602 00001FDF 88D7                <1> 	mov	bh, dl ; clr
  2603 00001FE1 28CF                <1> 	sub	bh, cl ; cul
  2604 00001FE3 FEC7                <1> 	inc	bh ; cols = clr-cul+1
  2605                              <1> 
  2606 00001FE5 20C0                <1> 	and	al, al ; nblines = 0
  2607 00001FE7 755D                <1> 	jnz	short vga_g_up_6
  2608 00001FE9 20ED                <1> 	and	ch, ch ; rul = 0
  2609 00001FEB 7559                <1> 	jnz	short vga_g_up_6
  2610 00001FED 20C9                <1> 	and	cl, cl ; cul = 0
  2611 00001FEF 7555                <1> 	jnz	short vga_g_up_6
  2612                              <1> 
  2613 00001FF1 6650                <1> 	push	ax
  2614 00001FF3 A0[EAFB0000]        <1> 	mov	al, [VGA_ROWS]
  2615 00001FF8 FEC8                <1> 	dec	al  
  2616 00001FFA 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  2617 00001FFC 7546                <1> 	jne	short vga_g_up_5
  2618 00001FFE A0[E4FB0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  2619 00002003 FEC8                <1> 	dec	al 
  2620 00002005 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  2621 00002007 753B                <1> 	jne	short vga_g_up_5
  2622 00002009 6658                <1> 	pop	ax
  2623                              <1> 
  2624 0000200B 66B80502            <1> 	mov	ax, 0205h
  2625 0000200F 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2626 00002013 66EF                <1> 	out	dx, ax
  2627 00002015 A0[EAFB0000]        <1> 	mov	al, [VGA_ROWS]
  2628 0000201A 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  2629 00002020 F6E4                <1> 	mul	ah
  2630 00002022 0FB7D0              <1> 	movzx	edx, ax
  2631                              <1> 	; 08/08/2016
  2632 00002025 0FB605[E6FB0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2633 0000202C F7E2                <1> 	mul	edx
  2634                              <1> 	; eax = byte count	
  2635 0000202E 89C1                <1> 	mov	ecx, eax
  2636                              <1> 	;; 07/08/2016
  2637                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  2638                              <1> 	;mov	ecx, edx
  2639 00002030 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  2640 00002032 BF00000A00          <1> 	mov	edi, 0A0000h
  2641 00002037 F3AA                <1> 	rep	stosb		
  2642                              <1> 	
  2643 00002039 66B80500            <1> 	mov	ax, 5
  2644 0000203D 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2645 00002041 66EF                <1> 	out	dx, ax ; 0005h	
  2646                              <1> 
  2647 00002043 C3                  <1> 	retn
  2648                              <1> 
  2649                              <1> vga_g_up_5:
  2650 00002044 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 00002046 803E04              <1> 	cmp	byte [esi], PLANAR4
  2660 00002049 7424                <1> 	je	short vga_g_up_planar
  2661 0000204B 803E03              <1> 	cmp	byte [esi], PLANAR1
  2662 0000204E 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 00002050 08C0                <1> 	or	al, al
  2675 00002052 7414                <1> 	jz	short vga_g_up_l2
  2676 00002054 88C4                <1> 	mov	ah, al
  2677 00002056 00EC                <1> 	add	ah, ch ; i+nblines
  2678                              <1> 	;jc	short vga_g_up_l2	
  2679 00002058 38F4                <1> 	cmp	ah, dh
  2680 0000205A 770C                <1> 	ja	short vga_g_up_l2
  2681                              <1> 	; else
  2682                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  2683 0000205C E8F2000000          <1> 	call	vgamem_copy_l8
  2684                              <1> vga_g_up_l1:
  2685 00002061 FEC5                <1> 	inc	ch
  2686 00002063 38F5                <1> 	cmp	ch, dh
  2687 00002065 76E9                <1> 	jna	short vga_g_up_l0
  2688 00002067 C3                  <1> 	retn
  2689                              <1> vga_g_up_l2:
  2690                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  2691 00002068 E850010000          <1> 	call	vgamem_fill_l8
  2692 0000206D 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 0000206F 20C0                <1> 	and	al, al
  2703 00002071 7414                <1> 	jz	short vga_g_up_pl2	
  2704 00002073 88C4                <1> 	mov	ah, al
  2705 00002075 00EC                <1> 	add	ah, ch ; i+nblines
  2706                              <1> 	;jc	short vga_g_up_pl2
  2707 00002077 38F4                <1> 	cmp	ah, dh
  2708 00002079 770C                <1> 	ja	short vga_g_up_pl2
  2709                              <1> 	; else
  2710                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  2711 0000207B E80E000000          <1> 	call	vgamem_copy_pl4
  2712                              <1> vga_g_up_pl1:
  2713 00002080 FEC5                <1> 	inc	ch 
  2714 00002082 38F5                <1> 	cmp	ch, dh
  2715 00002084 76E9                <1> 	jna	short vga_g_up_pl0
  2716 00002086 C3                  <1> 	retn
  2717                              <1> vga_g_up_pl2:
  2718                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  2719 00002087 E870000000          <1> 	call	vgamem_fill_pl4
  2720 0000208C 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 0000208E 52                  <1> 	push	edx
  2740 0000208F 50                  <1> 	push	eax
  2741                              <1> 
  2742                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0105)
  2743 00002090 66B80501            <1> 	mov	ax, 0105h
  2744 00002094 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2745 00002098 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 0000209A 0FB6542401          <1> 	movzx	edx, byte [esp+1]
  2751                              <1> 	; 08/08/2016
  2752 0000209F 0FB605[E6FB0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2753 000020A6 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  2754 000020AC 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 000020AE 50                  <1> 	push	eax ; cheight * nbcols
  2759 000020AF F7E2                <1> 	mul	edx ; * ysrc
  2760                              <1> 	; eax = ysrc * cheight * nbcols
  2761                              <1> 	; edx = 0
  2762 000020B1 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2763 000020B3 01D0                <1>  	add	eax, edx
  2764 000020B5 89C6                <1> 	mov	esi, eax ; src
  2765 000020B7 88EA                <1> 	mov	dl, ch ; ydest
  2766 000020B9 58                  <1> 	pop	eax ; cheight * nbcols
  2767 000020BA F7E2                <1> 	mul	edx
  2768                              <1> 	; eax = ydest * cheight * nbcols
  2769 000020BC 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2770 000020BE 01D0                <1>  	add	eax, edx
  2771 000020C0 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 000020C2 51                  <1> 	push	ecx
  2779 000020C3 B900000A00          <1> 	mov	ecx, 0A0000h
  2780 000020C8 01CE                <1> 	add	esi, ecx
  2781 000020CA 01CF                <1> 	add	edi, ecx
  2782                              <1> 	; 08/08/2016
  2783 000020CC 8A35[E6FB0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2784                              <1> 	;; 07/08/2016
  2785                              <1> 	;mov	dh, 8 ; 07/08/2016
  2786 000020D2 28D2                <1> 	sub	dl, dl ; i
  2787                              <1> vgamem_copy_pl4_0:
  2788 000020D4 56                  <1> 	push	esi
  2789 000020D5 57                  <1> 	push	edi
  2790 000020D6 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2791 000020DD F6E2                <1> 	mul	dl
  2792                              <1> 	; eax = i * nbcols
  2793 000020DF 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2794 000020E1 01C6                <1> 	add	esi, eax
  2795 000020E3 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2796 000020E6 F3A4                <1> 	rep	movsb
  2797 000020E8 5F                  <1> 	pop	edi
  2798 000020E9 5E                  <1> 	pop	esi
  2799 000020EA FECE                <1> 	dec	dh
  2800 000020EC 75E6                <1> 	jnz	short vgamem_copy_pl4_0
  2801                              <1> vgamem_copy_pl4_1:
  2802 000020EE 59                  <1> 	pop	ecx
  2803                              <1> 
  2804                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2805 000020EF 66B80500            <1> 	mov	ax, 0005h
  2806 000020F3 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2807 000020F7 66EF                <1> 	out	dx, ax
  2808                              <1> 
  2809 000020F9 58                  <1> 	pop	eax
  2810 000020FA 5A                  <1> 	pop	edx
  2811                              <1> 
  2812 000020FB 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 000020FC 52                  <1> 	push	edx
  2831 000020FD 50                  <1> 	push	eax
  2832                              <1> 
  2833                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205)
  2834 000020FE 66B80502            <1> 	mov	ax, 0205h
  2835 00002102 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2836 00002106 66EF                <1> 	out	dx, ax
  2837                              <1> 
  2838                              <1>       	; 08/08/2016
  2839 00002108 0FB605[E6FB0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  2840 0000210F F6E5                <1> 	mul	ch
  2841                              <1> 	;; 07/08/2016
  2842                              <1> 	;movzx	eax, ch
  2843                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  2844 00002111 0FB615[E4FB0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  2845 00002118 F7E2                <1> 	mul	edx
  2846                              <1> 	; edx  = 0
  2847 0000211A 88CA                <1> 	mov	dl, cl 
  2848 0000211C 01D0                <1> 	add	eax, edx
  2849 0000211E 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 00002120 81C700000A00        <1> 	add	edi, 0A0000h
  2856 00002126 51                  <1> 	push	ecx
  2857                              <1> 	; 08/08/2016
  2858 00002127 8A35[E6FB0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2859                              <1> 	;; 07/08/2016
  2860                              <1> 	;mov	dh, 8 ; 07/08/2016
  2861 0000212D 28D2                <1> 	sub	dl, dl ; i
  2862                              <1> vgamem_fill_pl4_0:
  2863 0000212F 57                  <1> 	push	edi
  2864 00002130 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2865 00002137 F6E2                <1> 	mul	dl
  2866                              <1> 	; eax = i * nbcols
  2867 00002139 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2868 0000213B 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  2869 0000213D 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2870 00002140 F3AA                <1>  	rep	stosb
  2871 00002142 5F                  <1> 	pop	edi
  2872 00002143 75EA                <1> 	jnz	short vgamem_fill_pl4_0
  2873                              <1> vgamem_fill_pl4_1:
  2874 00002145 59                  <1> 	pop	ecx
  2875                              <1> 
  2876                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2877 00002146 66B80500            <1> 	mov	ax, 0005h
  2878 0000214A 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2879 0000214E 66EF                <1> 	out	dx, ax
  2880                              <1> 
  2881 00002150 58                  <1> 	pop	eax
  2882 00002151 5A                  <1> 	pop	edx 
  2883                              <1> 	
  2884 00002152 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 00002153 52                  <1> 	push	edx
  2907 00002154 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 00002155 0FB6D4              <1> 	movzx	edx, ah ; ysrc
  2917                              <1> 	; 08/08/2016
  2918 00002158 0FB605[E6FB0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2919 0000215F 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  2920 00002165 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 00002167 50                  <1> 	push	eax ; cheight * nbcols
  2925 00002168 F7E2                <1> 	mul	edx ; * ysrc
  2926                              <1> 	; eax = ysrc * cheight * nbcols
  2927                              <1> 	; edx = 0
  2928 0000216A 88CA                <1> 	mov	dl, cl ; edx = xstart
  2929 0000216C 01D0                <1>  	add	eax, edx
  2930 0000216E 89C6                <1> 	mov	esi, eax ; src
  2931 00002170 66C1E603            <1> 	shl	si, 3 ; * 8 ; 06/08/2016
  2932 00002174 88EA                <1> 	mov	dl, ch ; ydest
  2933 00002176 58                  <1> 	pop	eax ; cheight * nbcols
  2934 00002177 F7E2                <1> 	mul	edx
  2935                              <1> 	; eax = ydest * cheight * nbcols
  2936 00002179 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2937 0000217B 01D0                <1>  	add	eax, edx
  2938 0000217D 89C7                <1> 	mov	edi, eax ; dest
  2939 0000217F 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 00002183 51                  <1> 	push	ecx
  2947 00002184 B900000A00          <1> 	mov	ecx, 0A0000h
  2948 00002189 01CE                <1> 	add	esi, ecx
  2949 0000218B 01CF                <1> 	add	edi, ecx
  2950                              <1> 	; 08/08/2016
  2951 0000218D 8A35[E6FB0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2952                              <1> 	;; 07/08/2016
  2953                              <1> 	;mov	dh, 8 ; 07/08/2016
  2954 00002193 28D2                <1> 	sub	dl, dl ; i
  2955                              <1> vgamem_copy_l8_0:
  2956 00002195 56                  <1> 	push	esi
  2957 00002196 57                  <1> 	push	edi
  2958 00002197 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2959 0000219E F6E2                <1> 	mul	dl
  2960                              <1> 	; eax = i * nbcols
  2961 000021A0 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  2962 000021A4 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2963 000021A6 01C6                <1> 	add	esi, eax
  2964 000021A8 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2965 000021AB 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  2966 000021AF F3A4                <1> 	rep	movsb
  2967 000021B1 5F                  <1> 	pop	edi
  2968 000021B2 5E                  <1> 	pop	esi
  2969 000021B3 FEC2                <1> 	inc	dl ; 06/08/2016
  2970 000021B5 FECE                <1> 	dec	dh
  2971 000021B7 75DC                <1> 	jnz	short vgamem_copy_l8_0
  2972                              <1> vgamem_copy_l8_1:
  2973 000021B9 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 000021BA 58                  <1> 	pop	eax
  2981 000021BB 5A                  <1> 	pop	edx
  2982                              <1> 
  2983 000021BC 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 000021BD 52                  <1> 	push	edx
  3005 000021BE 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 000021BF 0FB605[E6FB0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  3014 000021C6 F6E5                <1> 	mul	ch
  3015                              <1> 	;; 07/08/2016
  3016                              <1> 	;movzx	eax, ch
  3017                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  3018 000021C8 0FB615[E4FB0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  3019 000021CF F7E2                <1> 	mul	edx
  3020                              <1> 	; edx  = 0
  3021 000021D1 88CA                <1> 	mov	dl, cl 
  3022 000021D3 01D0                <1> 	add	eax, edx
  3023 000021D5 89C7                <1> 	mov	edi, eax
  3024 000021D7 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 000021DB 81C700000A00        <1> 	add	edi, 0A0000h
  3031 000021E1 51                  <1> 	push	ecx
  3032                              <1> 	; 08/08/2016
  3033 000021E2 8A35[E6FB0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  3034                              <1> 	;; 07/08/2016
  3035                              <1> 	;mov	dh, 8 ; 07/08/2016
  3036 000021E8 28D2                <1> 	sub	dl, dl ; i
  3037                              <1> vgamem_fill_l8_0:
  3038 000021EA 57                  <1> 	push	edi
  3039 000021EB 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS]
  3040 000021F2 F6E2                <1> 	mul	dl
  3041                              <1> 	; eax = i * nbcols
  3042 000021F4 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  3043 000021F8 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  3044 000021FA 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  3045 000021FC 0FB6CF              <1> 	movzx	ecx, bh ; cols
  3046 000021FF 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  3047 00002203 F3AA                <1>  	rep	stosb
  3048 00002205 5F                  <1> 	pop	edi
  3049 00002206 FEC2                <1> 	inc	dl ; 06/08/2016
  3050 00002208 FECE                <1> 	dec	dh
  3051 0000220A 75DE                <1> 	jnz	short vgamem_fill_l8_0
  3052                              <1> vgamem_fill_l8_1:
  3053 0000220C 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 0000220D 58                  <1> 	pop	eax
  3061 0000220E 5A                  <1> 	pop	edx 
  3062                              <1> 
  3063 0000220F 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 00002210 FC                  <1>         cld     ; !!! Clear direction flag !!! 
  3089                              <1> 
  3090 00002211 88C7                <1> 	mov	bh, al ; 31/07/2016
  3091                              <1> 
  3092 00002213 BE[FEFB0000]        <1> 	mov	esi, vga_modes
  3093 00002218 89F7                <1> 	mov	edi, esi
  3094 0000221A 83C710              <1> 	add	edi, vga_mode_count
  3095                              <1> vga_g_down_0:
  3096 0000221D AC                  <1> 	lodsb
  3097 0000221E 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  3098 00002220 7405                <1> 	je	short vga_g_down_1
  3099 00002222 39FE                <1> 	cmp	esi, edi
  3100 00002224 72F7                <1> 	jb	short vga_g_down_0
  3101                              <1> 	; xor 	bh, bh	; 31/07/2016
  3102 00002226 C3                  <1> 	retn	; nothing to do
  3103                              <1> vga_g_down_1:
  3104 00002227 88F8                <1> 	mov	al, bh ; 31/07/2016
  3105 00002229 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 0000222C 3A35[EAFB0000]      <1> 	cmp	dh, [VGA_ROWS]
  3114 00002232 7208                <1> 	jb	short vga_g_down_2
  3115 00002234 8A35[EAFB0000]      <1> 	mov	dh, [VGA_ROWS]
  3116 0000223A FECE                <1> 	dec	dh
  3117                              <1> vga_g_down_2:
  3118 0000223C 3A15[E4FB0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  3119 00002242 7208                <1> 	jb	short vga_g_down_3
  3120 00002244 8A15[E4FB0000]      <1> 	mov	dl, [CRT_COLS]
  3121 0000224A FECA                <1> 	dec	dl
  3122                              <1> vga_g_down_3:	
  3123 0000224C 3A05[EAFB0000]      <1> 	cmp	al, [VGA_ROWS]
  3124 00002252 7602                <1> 	jna	short vga_g_down_4
  3125 00002254 28C0                <1> 	sub	al, al ; 0
  3126                              <1> vga_g_down_4:
  3127 00002256 88F7                <1> 	mov	bh, dh ; clr
  3128 00002258 28CF                <1> 	sub	bh, cl ; cul
  3129 0000225A FEC7                <1> 	inc	bh ; cols = clr-cul+1
  3130                              <1> 
  3131 0000225C 20C0                <1> 	and	al, al ; nblines = 0
  3132 0000225E 755B                <1> 	jnz	short vga_g_down_6
  3133 00002260 20ED                <1> 	and	ch, ch ; rul = 0
  3134 00002262 7557                <1> 	jnz	short vga_g_down_6
  3135 00002264 20C9                <1> 	and	cl, cl ; cul = 0
  3136 00002266 7553                <1> 	jnz	short vga_g_down_6
  3137                              <1> 
  3138 00002268 6650                <1> 	push	ax
  3139 0000226A A0[EAFB0000]        <1> 	mov	al, [VGA_ROWS]
  3140 0000226F FEC8                <1> 	dec	al  
  3141 00002271 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  3142 00002273 7544                <1> 	jne	short vga_g_down_5
  3143 00002275 A0[E4FB0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  3144 0000227A FEC8                <1> 	dec	al 
  3145 0000227C 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  3146 0000227E 7539                <1> 	jne	short vga_g_down_5
  3147 00002280 6658                <1> 	pop	ax
  3148                              <1> 
  3149 00002282 66B80502            <1> 	mov	ax, 0205h
  3150 00002286 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3151 0000228A 66EF                <1> 	out	dx, ax
  3152 0000228C A0[EAFB0000]        <1> 	mov	al, [VGA_ROWS]
  3153 00002291 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  3154 00002297 F6E4                <1> 	mul	ah
  3155 00002299 0FB7D0              <1> 	movzx	edx, ax
  3156                              <1> 	; 08/08/2016
  3157 0000229C 0FB605[E6FB0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  3158 000022A3 F7E2                <1> 	mul	edx
  3159                              <1> 	; eax = byte count	
  3160 000022A5 89C1                <1> 	mov	ecx, eax
  3161                              <1> 	;; 07/08/2016
  3162                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  3163                              <1> 	;mov	ecx, edx
  3164 000022A7 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  3165 000022A9 BF00000A00          <1> 	mov	edi, 0A0000h
  3166 000022AE F3AA                <1> 	rep	stosb			
  3167                              <1> 	
  3168 000022B0 B005                <1> 	mov	al, 5
  3169 000022B2 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3170 000022B6 66EF                <1> 	out	dx, ax ; 0005h	
  3171                              <1> 
  3172 000022B8 C3                  <1> 	retn
  3173                              <1> 
  3174                              <1> vga_g_down_5:
  3175 000022B9 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 000022BB 803E04              <1> 	cmp	byte [esi], PLANAR4
  3185 000022BE 742C                <1> 	je	short vga_g_down_planar
  3186 000022C0 803E03              <1> 	cmp	byte [esi], PLANAR1
  3187 000022C3 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 000022C5 08C0                <1> 	or	al, al
  3200 000022C7 741C                <1> 	jz	short vga_g_down_l2
  3201 000022C9 88C4                <1> 	mov	ah, al
  3202 000022CB 00EC                <1> 	add	ah, ch
  3203                              <1> 	;jc	short vga_g_down_l2	
  3204 000022CD 86EE                <1> 	xchg	ch, dh
  3205 000022CF 38E5                <1> 	cmp	ch, ah
  3206 000022D1 7212                <1> 	jb	short vga_g_down_l2
  3207 000022D3 88EC                <1> 	mov	ah, ch
  3208 000022D5 28C4                <1> 	sub	ah, al ; ah = i - nblines
  3209                              <1> 	; else
  3210                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  3211 000022D7 E877FEFFFF          <1> 	call	vgamem_copy_l8
  3212                              <1> vga_g_down_l1:
  3213 000022DC 86F5                <1> 	xchg	dh, ch
  3214 000022DE FECE                <1> 	dec	dh 
  3215 000022E0 38EE                <1> 	cmp	dh, ch
  3216 000022E2 73E1                <1> 	jnb	short vga_g_down_l0
  3217 000022E4 C3                  <1> 	retn
  3218                              <1> 
  3219                              <1> vga_g_down_l2:
  3220                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  3221 000022E5 E8D3FEFFFF          <1> 	call	vgamem_fill_l8
  3222 000022EA 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 000022EC 08C0                <1> 	or	al, al
  3233 000022EE 741C                <1> 	jz	short vga_g_down_pl2
  3234 000022F0 88C4                <1> 	mov	ah, al
  3235 000022F2 00EC                <1> 	add	ah, ch
  3236                              <1> 	;jc	short vga_g_down_pl2	
  3237 000022F4 86EE                <1> 	xchg	ch, dh
  3238 000022F6 38E5                <1> 	cmp	ch, ah
  3239 000022F8 7212                <1> 	jb	short vga_g_down_pl2
  3240 000022FA 88EC                <1> 	mov	ah, ch
  3241 000022FC 28C4                <1> 	sub	ah, al ; ah = i - nblines
  3242                              <1> 	; else
  3243                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  3244 000022FE E88BFDFFFF          <1> 	call	vgamem_copy_pl4
  3245                              <1> vga_g_down_pl1:
  3246 00002303 86F5                <1> 	xchg	dh, ch
  3247 00002305 FECE                <1> 	dec	dh 
  3248 00002307 38EE                <1> 	cmp	dh, ch
  3249 00002309 73E1                <1> 	jnb	short vga_g_down_pl0
  3250 0000230B C3                  <1> 	retn
  3251                              <1> 
  3252                              <1> vga_g_down_pl2:
  3253                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  3254 0000230C E8EBFDFFFF          <1> 	call	vgamem_fill_pl4
  3255 00002311 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 00002313 80FC07              <1> 	cmp	ah, 7
  3289 00002316 0F87F4FEFFFF        <1>         ja      vga_graphics_down
  3290                              <1> 	;je	_n0
  3291                              <1> 
  3292 0000231C 88C7                <1> 	MOV	bh, al			; save line count in BH
  3293 0000231E 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 00002321 E8F1010000          <1> 	CALL	GRAPH_POSN
  3299 00002326 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  3300                              <1> 
  3301                              <1> ;-----	DETERMINE SIZE OF WINDOW
  3302                              <1> 
  3303 00002329 6629CA              <1> 	SUB	DX, CX
  3304 0000232C 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  3305 00002331 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 00002334 803D[E2FB0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  3311 0000233B 7307                <1>         JNC     short _R12              ; FIND_SOURCE_DOWN
  3312                              <1> 
  3313                              <1> ;-----	MEDIUM RES DOWN
  3314 0000233D D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  3315 0000233F 66D1E7              <1> 	SAL	DI, 1			; OFFSET *2 SINCE 2 BYTES/CHAR
  3316 00002342 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 00002344 81C700800B00        <1> 	add	edi, 0B8000h		
  3322 0000234A 6681C7F000          <1> 	ADD	DI, 240			; POINT TO LAST ROW OF PIXELS
  3323 0000234F C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  3324 00002352 74(06)              <1> 	JZ	short 6			; IF ZERO, THEN BLANK ENTIRE FIELD
  3325 00002354 B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  3326 00002356 F6E7                <1> 	mul	bh			; determine offset to source
  3327 00002358 89FE                <1> 	MOV	eSI, eDI		; SET UP SOURCE
  3328 0000235A 6629C6              <1> 	SUB	SI, AX			; SUBTRACT THE OFFSET
  3329 0000235D 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  3330 0000235F 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 00002361 E823000000          <1>         CALL    _R17                    ; MOVE ONE ROW
  3336 00002366 6681EE5020          <1> 	SUB	SI, 2000h+80		; MOVE TO NEXT ROW
  3337 0000236B 6681EF5020          <1> 	SUB	DI, 2000h+80
  3338 00002370 FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  3339 00002372 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 00002374 88D8                <1> 	mov	al, bl			; attribute to fill with
  3344                              <1> _R15_:                                  ; CLEAR_LOOP_DOWN
  3345 00002376 E82A000000          <1> 	CALL	_R18			; CLEAR A ROW
  3346 0000237B 6681EF5020          <1> 	SUB	DI, 2000h+80		; POINT TO NEXT LINE
  3347 00002380 FECF                <1> 	dec	bh			; number of lines to fill
  3348 00002382 75F2                <1>         JNZ     short _R15_             ; CLEAR_LOOP_DOWN
  3349                              <1> 
  3350 00002384 C3                  <1> 	retn				; EVERYYHING DONE
  3351                              <1> 
  3352                              <1> _R16:                                   ; BLANK_FIELD_DOWN
  3353 00002385 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  3354 00002387 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 00002389 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN THE ROW
  3363 0000238C 56                  <1> 	PUSH	eSI
  3364 0000238D 57                  <1> 	PUSH	eDI			; SAVE POINTERS
  3365 0000238E F3A4                <1> 	REP	MOVSB			; MOVE THE EVEN FIELD
  3366 00002390 5F                  <1> 	POP	eDI
  3367 00002391 5E                  <1> 	POP	eSI
  3368 00002392 6681C60020          <1> 	ADD	SI, 2000h
  3369 00002397 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO THE ODD FIELD
  3370 0000239C 56                  <1> 	PUSH	eSI
  3371 0000239D 57                  <1> 	PUSH	eDI			; SAVE THE POINTERS
  3372 0000239E 88D1                <1> 	MOV	CL, DL			; COUNT BACK
  3373 000023A0 F3A4                <1> 	REP	MOVSB			; MOVE THE ODD FIELD
  3374 000023A2 5F                  <1> 	POP	eDI
  3375 000023A3 5E                  <1> 	POP	eSI			; POINTERS BACK
  3376 000023A4 C3                  <1> 	RETn				; RETURN TO CALLER
  3377                              <1> 
  3378                              <1> ;-----	CLEAR A SINGLE ROW
  3379                              <1> 
  3380                              <1> _R18:
  3381 000023A5 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN FIELD
  3382 000023A8 57                  <1> 	PUSH	eDI			; SAVE POINTER
  3383 000023A9 F3AA                <1> 	REP	STOSB			; STORE THE NEW VALUE
  3384 000023AB 5F                  <1> 	POP	eDI			; POINTER BACK
  3385 000023AC 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO ODD FIELD
  3386 000023B1 57                  <1> 	PUSH	eDI
  3387 000023B2 88D1                <1> 	MOV	CL, DL
  3388 000023B4 F3AA                <1> 	REP	STOSB			; FILL THE ODD FIELD
  3389 000023B6 5F                  <1> 	POP	eDI
  3390 000023B7 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 000023B8 25FF000000          <1> 	and 	eax, 0FFh		; ZERO TO HIGH OF CODE POINT
  3429 000023BD 50                  <1> 	PUSH	eAX			; SAVE CODE POINT VALUE
  3430                              <1> 
  3431                              <1> ;-----	DETERMINE POSITION IN REGEN BUFFER TO PUT CODE POINTS
  3432                              <1> 
  3433 000023BE E84D010000          <1> 	CALL	S26			; FIND LOCATION IN REGEN BUFFER
  3434 000023C3 89C7                <1> 	MOV	eDI, eAX		; REGEN POINTER IN DI
  3435                              <1> 
  3436                              <1> ;-----	DETERMINE REGION TO GET CODE POINTS FROM
  3437                              <1> 
  3438 000023C5 58                  <1> 	POP	eAX			; RECOVER CODE POINT
  3439                              <1> 
  3440 000023C6 BE[24080100]        <1> 	MOV	eSI, CRT_CHAR_GEN	; OFFSET OF IMAGES
  3441                              <1> 
  3442                              <1> ;-----	DETERMINE GRAPHICS MODE IN OPERATION
  3443                              <1> 					; DETERMINE_MODE
  3444 000023CB 66C1E003            <1> 	SAL	AX, 3			; MULTIPLY CODE POINT VALUE BY 8
  3445 000023CF 01C6                <1> 	ADD	eSI, eAX		; SI HAS OFFSET OF DESIRED CODES
  3446                              <1> 	
  3447 000023D1 803D[E2FB0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3448 000023D8 7231                <1> 	JC	short S6		; TEST FOR MEDIUM RESOLUTION MODE
  3449                              <1> 
  3450                              <1> ;-----	HIGH RESOLUTION MODE
  3451                              <1> 
  3452 000023DA 81C700800B00        <1> 	add	edi, 0B8000h
  3453                              <1> S1:					; HIGH_CHAR
  3454 000023E0 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  3455 000023E1 56                  <1> 	PUSH	eSI			; SAVE CODE POINTER
  3456 000023E2 B604                <1> 	MOV	DH, 4			; NUMBER OF TIMES THROUGH LOOP
  3457                              <1> S2:
  3458 000023E4 AC                  <1> 	LODSB				; GET BYTE FROM CODE POINTS
  3459 000023E5 F6C380              <1> 	TEST	BL, 80H			; SHOULD WE USE THE FUNCTION
  3460 000023E8 7515                <1> 	JNZ	short S5		; TO PUT CHAR IN
  3461 000023EA AA                  <1> 	STOSB				; STORE IN REGEN BUFFER
  3462 000023EB AC                  <1> 	LODSB
  3463                              <1> S4:
  3464 000023EC 8887FF1F0000        <1> 	MOV	[eDI+2000H-1], AL ; STORE IN SECOND HALF
  3465 000023F2 83C74F              <1> 	ADD	eDI, 79			; MOVE TO NEXT ROW IN REGEN
  3466 000023F5 FECE                <1> 	DEC	DH			; DONE WITH LOOP
  3467 000023F7 75EB                <1> 	JNZ	short S2
  3468 000023F9 5E                  <1> 	POP	eSI
  3469 000023FA 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  3470 000023FB 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  3471 000023FC E2E2                <1> 	LOOP	S1			; MORE CHARS TO WRITE
  3472 000023FE C3                  <1> 	retn
  3473                              <1> 
  3474                              <1> S5:
  3475 000023FF 3207                <1> 	XOR	AL, [eDI]		; EXCLUSIVE OR WITH CURRENT
  3476 00002401 AA                  <1> 	STOSB				; STORE THE CODE POINT
  3477 00002402 AC                  <1> 	LODSB				; AGAIN FOR ODD FIELD
  3478 00002403 3287FF1F0000        <1> 	XOR	AL, [eDI+2000H-1]
  3479 00002409 EBE1                <1> 	JMP	short S4		; BACK TO MAINSTREAM
  3480                              <1> 
  3481                              <1> ;-----	MEDIUM RESOLUTION WRITE
  3482                              <1> S6:					; MED_RES_WRITE
  3483 0000240B 88DA                <1> 	MOV	DL, BL			; SAVE HIGH COLOR BIT
  3484 0000240D 66D1E7              <1> 	SAL	DI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  3485                              <1> 					; EXPAND BL TO FULL WORD OF COLOR
  3486 00002410 80E303              <1> 	AND	BL, 3			; ISOLATE THE COLOR BITS ( LOW 2 BITS )
  3487 00002413 B055                <1> 	MOV	AL, 055H 		; GET BIT CONVERSION MULTIPLIER
  3488 00002415 F6E3                <1> 	MUL	BL			; EXPAND 2 COLOR BITS TO 4 REPLICATIONS
  3489 00002417 88C3                <1> 	MOV	BL, AL			; PLACE BACK IN WORK REGISTER
  3490 00002419 88C7                <1> 	MOV	BH, AL			; EXPAND TO 8 REPLICATIONS OF COLOR BITS
  3491 0000241B 81C700800B00        <1> 	add	edi, 0B8000h
  3492                              <1> S7:                                     ; MED_CHAR
  3493 00002421 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  3494 00002422 56                  <1> 	PUSH	eSI			; SAVE THE CODE POINTER
  3495 00002423 B604                <1> 	MOV	DH, 4			; NUMBER OF LOOPS
  3496                              <1> S8:
  3497 00002425 AC                  <1> 	LODSB				; GET CODE POINT
  3498 00002426 E8B3000000          <1> 	CALL	S21			; DOUBLE UP ALL THE BITS
  3499 0000242B 6621D8              <1> 	AND	AX, BX			; CONVERT TO FOREGROUND COLOR ( 0 BACK )
  3500 0000242E 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  3501 00002430 F6C280              <1> 	TEST	DL, 80H			; IS THIS XOR FUNCTION
  3502 00002433 7403                <1> 	JZ	short S9		; NO, STORE IT IN AS IS
  3503 00002435 663307              <1> 	XOR	AX, [eDI]		; DO FUNCTION WITH LOW/HIGH
  3504                              <1> S9:
  3505 00002438 668907              <1> 	MOV	[eDI], AX		; STORE FIRST BYTE HIGH, SECOND LOW
  3506 0000243B AC                  <1> 	LODSB				; GET CODE POINT
  3507 0000243C E89D000000          <1> 	CALL	S21
  3508 00002441 6621D8              <1> 	AND	AX, BX			; CONVERT TO COLOR
  3509 00002444 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  3510 00002446 F6C280              <1> 	TEST	DL, 80H			; AGAIN, IS THIS XOR FUNCTION
  3511 00002449 7407                <1> 	JZ	short _S10		; NO, JUST STORE THE VALUES
  3512 0000244B 66338700200000      <1> 	XOR	AX, [eDI+2000H]		; FUNCTION WITH FIRST HALF LOW
  3513                              <1> _S10:
  3514 00002452 66898700200000      <1> 	MOV	[eDI+2000H], AX		; STORE SECOND PORTION HIGH
  3515 00002459 6683C750            <1> 	ADD	DI, 80			; POINT TO NEXT LOCATION
  3516 0000245D FECE                <1> 	DEC	DH
  3517 0000245F 75C4                <1> 	JNZ	short S8		; KEEP GOING
  3518 00002461 5E                  <1> 	POP	eSI			; RECOVER CODE POINTER
  3519 00002462 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  3520 00002463 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  3521 00002464 47                  <1> 	INC	eDI
  3522 00002465 E2BA                <1> 	LOOP	S7			; MORE TO WRITE
  3523 00002467 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 00002468 E8A3000000          <1> 	CALL	S26			; CONVERTED TO OFFSET IN REGEN
  3534 0000246D 89C6                <1> 	MOV	eSI, eAX		; SAVE IN SI
  3535 0000246F 81C600800B00        <1> 	add	esi, 0B8000h		; 01/07/2016
  3536 00002475 83EC08              <1> 	SUB	eSP, 8			; ALLOCATE SPACE FOR THE READ CODE POINT
  3537 00002478 89E5                <1> 	MOV	eBP, eSP		; POINTER TO SAVE AREA
  3538                              <1> 
  3539                              <1> ;-----	DETERMINE GRAPHICS MODES
  3540 0000247A B604                <1> 	mov	dh, 4			; number of passes ; 01/07/2016
  3541 0000247C 803D[E2FB0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3542 00002483 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 00002485 8A06                <1> 	MOV	AL, [eSI] 		; GET FIRST BYTE
  3549 00002487 884500              <1> 	MOV	[eBP], AL 		; SAVE IN STORAGE AREA
  3550 0000248A 45                  <1> 	INC	eBP			; NEXT LOCATION
  3551 0000248B 8A8600200000        <1> 	MOV	AL, [eSI+2000H]		; GET LOWER REGION BYTE
  3552 00002491 884500              <1> 	MOV	[eBP], AL 		; ADJUST AND STORE
  3553 00002494 45                  <1> 	INC	eBP
  3554 00002495 83C650              <1> 	ADD	eSI, 80			; POINTER INTO REGEN
  3555 00002498 FECE                <1> 	DEC	DH			; LOOP CONTROL
  3556 0000249A 75E9                <1> 	JNZ	short S11		; DO IT SOME MORE
  3557 0000249C EB1D                <1> 	JMP	SHORT S14		; GO MATCH THE SAVED CODE POINTS
  3558                              <1> 
  3559                              <1> ;-----	MEDIUM RESOLUTION READ
  3560                              <1> S12:	
  3561 0000249E 66D1E6              <1> 	SAL	SI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  3562                              <1> 	;MOV	DH, 4			; NUMBER OF PASSES
  3563                              <1> S13:
  3564 000024A1 E84D000000          <1> 	CALL	S23			; GET BYTES FROM REGEN INTO SINGLE SAVE
  3565 000024A6 81C6FE1F0000        <1> 	ADD	eSI, 2000H-2		; GO TO LOWER REGION
  3566 000024AC E842000000          <1> 	CALL	S23			; GET THIS PAIR INTO SAVE
  3567 000024B1 81EEB21F0000        <1> 	SUB	eSI, 2000H-80+2		; ADJUST POINTER BACK INTO UPPER
  3568 000024B7 FECE                <1> 	DEC	DH
  3569 000024B9 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 000024BB BF[24080100]        <1> 	MOV	eDI, CRT_CHAR_GEN	; ESTABLISH ADDRESSING
  3574 000024C0 83ED08              <1> 	SUB	eBP, 8			; ADJUST POINTER TO START OF SAVE AREA
  3575 000024C3 89EE                <1> 	MOV	eSI, eBP
  3576                              <1> S15:
  3577 000024C5 66B80001            <1> 	mov	ax, 256			; NUMBER TO TEST AGAINST
  3578                              <1> S16:
  3579 000024C9 56                  <1> 	PUSH	eSI			; SAVE SAVE AREA POINTER
  3580 000024CA 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 000024CB A7                  <1> 	cmpsd				; compare first 4 bytes 
  3584 000024CC 7501                <1> 	jne	short S17		; 
  3585 000024CE A7                  <1> 	cmpsd				; compare last 4 bytes
  3586                              <1> S17:
  3587 000024CF 5F                  <1> 	POP	eDI			; RECOVER THE POINTERS
  3588 000024D0 5E                  <1> 	POP	eSI
  3589                              <1> 	;JZ	short S18		; IF ZERO FLAG SET, THEN MATCH OCCURRED
  3590 000024D1 7407                <1> 	je	short S18
  3591                              <1> 	;				; NO MATCH, MOVE ON TO NEXT
  3592 000024D3 83C708              <1> 	ADD	eDI, 8			; NEXT CODE POINT
  3593 000024D6 6648                <1> 	dec	ax			; LOOP CONTROL
  3594 000024D8 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 000024DA 83C408              <1> 	ADD	eSP, 8			; READJUST THE STACK, THROW AWAY SAVE
  3599 000024DD 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 000024DE 6651                <1> 	PUSH	CX			; SAVE REGISTER
  3611                              <1> 	;MOV	CX, 8			; SHIFT COUNT REGISTER FOR ONE BYTE
  3612 000024E0 B108                <1> 	mov	cl, 8
  3613                              <1> S22:
  3614 000024E2 D0C8                <1> 	ROR	AL,1			; SHIFT BITS, LOW BIT INTO CARRY FLAG
  3615 000024E4 66D1DD              <1> 	RCR	BP,1			; MOVE CARRY FLAG (LOW BIT INTO RESULTS
  3616 000024E7 66D1FD              <1> 	SAR	BP,1			; SIGN EXTEND HIGH BIT (DOUBLE IT)
  3617                              <1> 	;LOOP	S22			; REPEAT FOR ALL 8 BITS
  3618 000024EA FEC9                <1> 	dec	cl
  3619 000024EC 75F4                <1> 	jnz	short S22
  3620 000024EE 6695                <1> 	XCHG	AX, BP			; MOVE RESULTS TO PARAMETER REGISTER
  3621 000024F0 6659                <1> 	POP	CX			; RECOVER REGISTER
  3622 000024F2 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 000024F3 66AD                <1> 	LODSW				; GET FIRST BYTE AND SECOND BYTES
  3641 000024F5 86C4                <1> 	XCHG	AL, AH			; SWAP FOR COMPARE
  3642 000024F7 66B900C0            <1> 	MOV	CX, 0C000H		; 2 BIT MASK TO TEST THE ENTRIES
  3643 000024FB B200                <1> 	MOV	DL, 0			; RESULT REGISTER
  3644                              <1> S24:
  3645 000024FD 6685C8              <1> 	TEST	AX, CX			; IS THIS SECTION BACKCROUND?
  3646 00002500 7401                <1>         JZ      short S25               ; IF ZERO, IT IS BACKGROUND (CARRY=0)
  3647 00002502 F9                  <1> 	STC				; WASN'T, SO SET CARRY
  3648                              <1> S25:
  3649 00002503 D0D2                <1> 	RCL	DL, 1			; MOVE THAT BIT INTO THE RESULT
  3650 00002505 66C1E902            <1> 	SHR	CX, 2			; MOVE THE MASK TO THE RIGHT BY 2 BITS
  3651 00002509 73F2                <1> 	JNC	short S24		; DO IT AGAIN IF MASK DIDN'T FALL OUT
  3652 0000250B 885500              <1> 	MOV	[eBP], DL 		; STORE RESULT IN SAVE AREA
  3653 0000250E 45                  <1> 	INC	eBP			; ADJUST POINTER
  3654 0000250F 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 00002510 0FB705[C6330100]    <1> 	movzx	eax, word [CURSOR_POSN]	; GET CURRENT CURSOR
  3671                              <1> GRAPH_POSN:
  3672 00002517 53                  <1> 	PUSH	eBX			; SAVE REGISTER
  3673 00002518 0FB6D8              <1> 	movzx	ebx, al			; SAVE A COPY OF CURRENT CURSOR
  3674 0000251B A0[E4FB0000]        <1> 	MOV	AL, [CRT_COLS]		; GET BYTES PER COLUMN
  3675 00002520 F6E4                <1> 	MUL	AH			; MULTIPLY BY ROWS
  3676 00002522 66C1E002            <1> 	SHL	AX, 2			; MULTIPLY * 4 SINCE 4 ROWS/BYTE
  3677 00002526 01D8                <1> 	ADD	eAX, eBX		; DETERMINE OFFSET
  3678 00002528 5B                  <1> 	POP	eBX			; RECOVER POINTER
  3679 00002529 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 0000252A 803D[E2FB0000]07    <1>         cmp     byte [CRT_MODE], 7      ; 09/07/2016
  3702 00002531 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 00002537 66BAD903            <1> 	mov	dx, 3D9h
  3708 0000253B A0[E5FB0000]        <1> 	MOV	AL, [CRT_PALETTE] 	; GET THE CURRENT PALETTE VALUE
  3709 00002540 08FF                <1> 	OR	BH, BH			; IS THIS COLOR 0?
  3710 00002542 7512                <1> 	JNZ	short M20		; OUTPUT COLOR 1
  3711                              <1> 
  3712                              <1> ;-----	HANDLE COLOR 0 BY SETTING THE BACKGROUND COLOR
  3713                              <1> 
  3714 00002544 24E0                <1> 	AND	AL, 0E0H 		; TURN OFF LOW 5 BITS OF CURRENT
  3715 00002546 80E31F              <1> 	AND	BL, 01FH 		; TURN OFF HIGH 3 BITS OF INPUT VALUE
  3716 00002549 08D8                <1> 	OR	AL, BL			; PUT VALUE INTO REGISTER
  3717                              <1> M19:					; OUTPUT THE PALETTE
  3718 0000254B EE                  <1> 	OUT	DX, AL			; OUTPUT COLOR SELECTION TO 3D9 PORT
  3719 0000254C A2[E5FB0000]        <1> 	MOV	[CRT_PALETTE], AL 	; SAVE THE COLOR VALUE
  3720 00002551 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 00002556 24DF                <1> 	AND	AL, 0DFH 		; TURN OFF PALETTE SELECT BIT
  3726 00002558 D0EB                <1> 	SHR	BL, 1			; TEST THE LOW ORDER BIT OF BL
  3727 0000255A 73EF                <1> 	JNC	short M19		; ALREADY DONE
  3728 0000255C 0C20                <1> 	OR	AL, 20H			; TURN ON PALETTE SELECT BIT
  3729 0000255E 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 00002560 8A25[E2FB0000]      <1> 	mov	ah,  [CRT_MODE]
  3754 00002566 80FC07              <1> 	cmp	ah, 7 ; 6!?
  3755 00002569 760A                <1> 	jna	short read_dot_cga
  3756                              <1> 
  3757 0000256B E8CB030000          <1> 	call	vga_read_pixel
  3758                              <1> 	; al = pixel value
  3759 00002570 E9D5EFFFFF          <1> 	jmp	_video_return
  3760                              <1> 
  3761                              <1> read_dot_cga:
  3762                              <1> 	;je	VIDEO_RETURN ; 7	
  3763 00002575 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  3764 00002578 0F82C7EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  3765                              <1> 
  3766 0000257E E855000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF DOT
  3767 00002583 8A06                <1> 	MOV	AL, [eSI]		; GET THE BYTE
  3768 00002585 20E0                <1> 	AND	AL, AH			; MASK OFF THE OTHER BITS IN THE BYTE
  3769 00002587 D2E0                <1> 	SHL	AL, CL			; LEFT JUSTIFY THE VALUE
  3770 00002589 88F1                <1> 	MOV	CL, DH			; GET NUMBER OF BITS IN RESULT
  3771 0000258B D2C0                <1> 	ROL	AL, CL			; RIGHT JUSTIFY THE RESULT
  3772                              <1> 	;JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  3773 0000258D 0FB6C0              <1> 	movzx	eax, al
  3774 00002590 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 00002595 8A25[E2FB0000]      <1> 	mov	ah, [CRT_MODE]
  3783 0000259B 80FC07              <1> 	cmp	ah, 7 ; 6!?
  3784 0000259E 760A                <1> 	jna	short write_dot_cga
  3785                              <1> 	
  3786 000025A0 E805030000          <1> 	call	vga_write_pixel
  3787 000025A5 E99BEFFFFF          <1> 	jmp	VIDEO_RETURN
  3788                              <1> 
  3789                              <1> write_dot_cga:
  3790                              <1> 	;je	VIDEO_RETURN ; 7	
  3791 000025AA 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  3792 000025AD 0F8292EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  3793                              <1> 
  3794                              <1> 	;PUSH	AX			; SAVE DOT VALUE
  3795 000025B3 6650                <1> 	PUSH	AX			; TWICE
  3796 000025B5 E81E000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF THE DOT
  3797 000025BA D2E8                <1> 	SHR	AL, CL			; SHIFT TO SET UP THE BITS FOR OUTPUT
  3798 000025BC 20E0                <1> 	AND	AL, AH			; STRIP OFF THE OTHER BITS
  3799 000025BE 8A0E                <1> 	MOV	CL, [eSI]		; GET THE CURRENT BYTE
  3800 000025C0 665B                <1> 	POP	BX			; RECOVER XOR FLAG
  3801 000025C2 F6C380              <1> 	TEST	BL, 80H			; IS IT ON
  3802 000025C5 750D                <1> 	JNZ	short R2		; YES, XOR THE DOT
  3803 000025C7 F6D4                <1> 	NOT	AH			; SET MASK TO REMOVE THE INDICATED BITS
  3804 000025C9 20E1                <1> 	AND	CL, AH
  3805 000025CB 08C8                <1> 	OR	AL, CL			; OR IN THE NEW VALUE OF THOSE BITS
  3806                              <1> R1:					; FINISH_DOT
  3807 000025CD 8806                <1> 	MOV	[eSI], AL		; RESTORE THE BYTE IN MEMORY
  3808                              <1> 	;POP	AX
  3809 000025CF E971EFFFFF          <1> 	JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  3810                              <1> R2:					; XOR_DOT
  3811 000025D4 30C8                <1> 	XOR	AL, CL			; EXCLUSIVE OR THE DOTS
  3812 000025D6 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 000025D8 0FB7F0              <1> 	movzx	esi, ax			; WILL SAVE AL AND AH DURING OPERATION
  3836 000025DB B028                <1> 	MOV	AL, 40
  3837 000025DD F6E2                <1> 	MUL	DL			; AX= ADDRESS OF START OF INDICATED ROW
  3838 000025DF A808                <1> 	TEST	AL, 08H 		; TEST FOR EVEN/ODD ROW CALCULATED
  3839 000025E1 7404                <1> 	JZ	short R4		; JUMP IF EVEN ROW
  3840 000025E3 6605D81F            <1> 	ADD	AX, 2000H-40		; OFFSET TO LOCATION OF ODD ROWS ADJUST
  3841                              <1> R4:					; EVEN_ROW
  3842 000025E7 6696                <1> 	XCHG	SI, AX			; MOVE POINTER TO (SI) AND RECOVER (AX)
  3843 000025E9 81C600800B00        <1> 	add	esi, 0B8000h
  3844 000025EF 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 000025F2 66BBC002            <1> 	MOV	BX, 2C0H
  3855 000025F6 66B90203            <1> 	MOV	CX, 302H 		; SET PARMS FOR MED RES
  3856 000025FA 803D[E2FB0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3857 00002601 7208                <1> 	JC	short R5		; HANDLE IF MED RES
  3858 00002603 66BB8001            <1> 	MOV	BX, 180H
  3859 00002607 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 0000260B 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 0000260D 66D3EA              <1> 	SHR	DX, CL			; SHIFT BY CORRECT AMOUNT
  3868 00002610 6601D6              <1> 	ADD	SI, DX			; INCREMENT THE POINTER
  3869 00002613 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 00002615 28C9                <1> 	SUB	CL, CL			; ZERO INTO STORAGE LOCATION
  3874                              <1> R6:
  3875 00002617 D0C8                <1> 	ROR	AL, 1			; LEFT JUSTIFY VALUE IN AL (FOR WRITE)
  3876 00002619 00E9                <1> 	ADD	CL, CH			; ADD IN THE BIT OFFSET VALUE
  3877 0000261B FECF                <1> 	DEC	BH			; LOOP CONTROL
  3878 0000261D 75F8                <1> 	JNZ	short R6		; ON EXIT, CL HAS COUNT TO RESTORE BITS
  3879 0000261F 88DC                <1> 	MOV	AH, BL			;  GET MASK TO AH
  3880 00002621 D2EC                <1> 	SHR	AH, CL			;  MOVE THE MASK TO CORRECT LOCATION
  3881 00002623 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 00002624 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  3901 00002628 28C0                <1> 	sub	al, al ; 0
  3902 0000262A EE                  <1> 	out	dx, al ; 0 ; color index, always 0 at the beginning	
  3903 0000262B 6642                <1> 	inc	dx   ; 3C9h ; VGAREG_DAC_DATA
  3904 0000262D B900010000          <1> 	mov	ecx, 256   ; always 256*3 values
  3905                              <1> 	;push	esi
  3906 00002632 88E0                <1> 	mov	al, ah
  3907 00002634 B43F                <1> 	mov	ah, 3Fh	; 3Fh except DAC selection number 3
  3908 00002636 3C02                <1> 	cmp 	al, 2
  3909 00002638 7414                <1> 	je	short l_dac_p_2
  3910 0000263A 7719                <1> 	ja	short l_dac_p_3
  3911 0000263C 20C0                <1> 	and	al, al
  3912 0000263E 7507                <1> 	jnz	short l_dac_p_1
  3913                              <1> l_dac_p_0:
  3914 00002640 BE[E4020100]        <1> 	mov	esi, palette0
  3915 00002645 EB15                <1> 	jmp	short l_dac_p_4	
  3916                              <1> l_dac_p_1:
  3917 00002647 BE[A4030100]        <1> 	mov	esi, palette1
  3918 0000264C EB0E                <1> 	jmp	short l_dac_p_4
  3919                              <1> l_dac_p_2:
  3920 0000264E BE[64040100]        <1> 	mov	esi, palette2
  3921 00002653 EB07                <1> 	jmp	short l_dac_p_4
  3922                              <1> l_dac_p_3:
  3923 00002655 B4FF                <1> 	mov	ah, 0FFh ; dac registers
  3924 00002657 BE[24050100]        <1> 	mov	esi, palette3
  3925                              <1> l_dac_p_4:
  3926 0000265C AC                  <1> 	lodsb
  3927 0000265D EE                  <1> 	out	dx, al  ; Red
  3928 0000265E AC                  <1> 	lodsb
  3929 0000265F EE                  <1> 	out	dx, al	; Green
  3930 00002660 AC                  <1> 	lodsb
  3931 00002661 EE                  <1> 	out	dx, al	; Blue
  3932 00002662 20E4                <1> 	and	ah, ah
  3933 00002664 7405                <1> 	jz	short l_dac_p_5	
  3934 00002666 FECC                <1> 	dec	ah
  3935 00002668 E2F2                <1> 	loop	l_dac_p_4
  3936                              <1> 	;pop	esi
  3937 0000266A C3                  <1> 	retn
  3938                              <1> l_dac_p_5:
  3939                              <1> 	; 29/07/2016
  3940 0000266B FEC9                <1> 	dec	cl
  3941 0000266D 7407                <1> 	jz	short l_dac_p_7
  3942                              <1> 	;
  3943 0000266F 28C0                <1> 	sub	al, al ; 0
  3944                              <1> l_dac_p_6:
  3945 00002671 EE                  <1> 	out	dx, al ; outb(VGAREG_DAC_DATA,0);
  3946 00002672 EE                  <1> 	out	dx, al
  3947 00002673 EE                  <1> 	out	dx, al
  3948 00002674 E2FB                <1> 	loop	l_dac_p_6
  3949                              <1> l_dac_p_7:
  3950                              <1> 	;pop	esi
  3951 00002676 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 00002677 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  3971 0000267B EC                  <1> 	in	al, dx
  3972 0000267C 30C0                <1> 	xor	al, al ; 0
  3973 0000267E 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  3974 00002682 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 00002683 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  3979 00002687 88D8                <1> 	mov	al, bl
  3980 00002689 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 0000268A 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  3985 0000268E EC                  <1> 	in	al, dx ; red
  3986 0000268F B44D                <1> 	mov	ah, 77 ; 0.3* Red
  3987 00002691 F6E4                <1> 	mul	ah
  3988 00002693 6650                <1> 	push	ax
  3989 00002695 EC                  <1> 	in	al, dx ; green
  3990 00002696 B497                <1> 	mov	ah, 151  ; 0.59 * Green
  3991 00002698 F6E4                <1> 	mul	ah
  3992 0000269A 6650                <1> 	push	ax
  3993 0000269C EC                  <1> 	in	al, dx ; blue
  3994 0000269D B41C                <1> 	mov	ah, 28 ; 0.11 * Blue
  3995 0000269F F6E4                <1> 	mul	ah
  3996 000026A1 665A                <1> 	pop	dx
  3997 000026A3 6601D0              <1> 	add	ax, dx
  3998 000026A6 665A                <1> 	pop	dx
  3999 000026A8 6601D0              <1> 	add	ax, dx
  4000 000026AB 66058000            <1> 	add	ax, 80h  
  4001 000026AF B03F                <1> 	mov	al, 3Fh
  4002 000026B1 38C4                <1> 	cmp	ah, al
  4003 000026B3 7602                <1> 	jna	short g_s_s_2
  4004 000026B5 88C4                <1> 	mov	ah, al
  4005                              <1> g_s_s_2:
  4006 000026B7 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  4007 000026BB 88D8                <1> 	mov	al, bl ; color index
  4008 000026BD EE                  <1> 	out	dx, al
  4009 000026BE 88E0                <1> 	mov	al, ah ; intensity
  4010 000026C0 6642                <1> 	inc	dx ; 3C9h ; VGAREG_DAC_DATA
  4011 000026C2 EE                  <1> 	out	dx, al ; R (R=G=B)
  4012 000026C3 88E0                <1> 	mov	al, ah ; intensity
  4013 000026C5 EE                  <1> 	out	dx, al ; G (R=G=B)
  4014 000026C6 88E0                <1>  	mov	al, ah ; intensity
  4015 000026C8 EE                  <1> 	out	dx, al ; B (R=G=B)
  4016 000026C9 6649                <1> 	dec	cx
  4017 000026CB 7404                <1> 	jz	short g_s_s_3
  4018 000026CD FEC3                <1> 	inc	bl    ; next color index value
  4019 000026CF EBB2                <1> 	jmp	short g_s_s_1
  4020                              <1> g_s_s_3:
  4021 000026D1 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  4022 000026D5 EC                  <1> 	in	al, dx
  4023 000026D6 B020                <1> 	mov	al, 20h
  4024 000026D8 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  4025 000026DC EE                  <1> 	out	dx, al ; 20h -> set bit 5
  4026                              <1> 		        ; (after loading palette regs)	
  4027 000026DD 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 000026DE 8A25[E2FB0000]      <1> 	mov 	ah, [CRT_MODE]
  4048 000026E4 668B15[C6330100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  4049                              <1> 
  4050 000026EB BE[FEFB0000]        <1> 	mov	esi, vga_modes
  4051 000026F0 89F7                <1> 	mov	edi, esi
  4052 000026F2 83C710              <1> 	add	edi, vga_mode_count
  4053                              <1> vga_wca_0:
  4054 000026F5 AC                  <1> 	lodsb
  4055 000026F6 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4056 000026F8 7405                <1> 	je	short vga_wca_2
  4057 000026FA 39FE                <1> 	cmp	esi, edi
  4058 000026FC 72F7                <1> 	jb	short vga_wca_0
  4059                              <1> vga_wca_1:
  4060 000026FE C3                  <1> 	retn	; nothing to do
  4061                              <1> vga_wca_2:
  4062 000026FF 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 00002702 803E04              <1> 	cmp	byte [esi], PLANAR4
  4068 00002705 741D                <1> 	je	short vga_wca_planar
  4069 00002707 803E03              <1> 	cmp	byte [esi], PLANAR1
  4070 0000270A 7418                <1> 	je	short vga_wca_planar
  4071                              <1> vga_wca_linear8:
  4072                              <1> 	; while((count-->0) && (xcurs<nbcols))
  4073                              <1> 	; CX = count
  4074 0000270C 6621C9              <1> 	and	cx, cx
  4075 0000270F 74ED                <1> 	jz	short vga_wca_1
  4076 00002711 3A15[E4FB0000]      <1> 	cmp	dl, [CRT_COLS]
  4077 00002717 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 00002719 E81E000000          <1> 	call	write_gfx_char_lin	 
  4082 0000271E 6649                <1> 	dec	cx ; count
  4083 00002720 FEC2                <1> 	inc	dl ; xcurs
  4084 00002722 EBE8                <1> 	jmp	short vga_wca_linear8
  4085                              <1> vga_wca_planar:
  4086                              <1> 	; while((count-->0) && (xcurs<nbcols))
  4087                              <1> 	; CX = count
  4088 00002724 6621C9              <1> 	and	cx, cx
  4089 00002727 74D5                <1> 	jz	short vga_wca_1
  4090 00002729 3A15[E4FB0000]      <1> 	cmp	dl, [CRT_COLS]
  4091 0000272F 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 00002731 E89D000000          <1> 	call	write_gfx_char_pl4
  4096 00002736 6649                <1> 	dec	cx ; count
  4097 00002738 FEC2                <1> 	inc	dl ; xcurs
  4098 0000273A 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 0000273C 51                  <1> 	push	ecx
  4118 0000273D 53                  <1> 	push	ebx
  4119 0000273E 52                  <1> 	push	edx
  4120 0000273F 50                  <1> 	push	eax
  4121                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  4122                              <1> 	; 08/08/2016
  4123 00002740 0FB6F0              <1> 	movzx	esi, al ; car
  4124 00002743 0FB6C6              <1> 	movzx	eax, dh ; ycurs
  4125 00002746 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4126 0000274C F6E4                <1> 	mul	ah
  4127                              <1> 	;shl	ax, 6 ; * 64
  4128 0000274E 66C1E003            <1>  	shl	ax, 3 ; * 8
  4129                              <1> 	;sub	dh, dh
  4130                              <1> 	;shl	dx, 3 ; xcurs * 8
  4131                              <1> 	;movzx	edi, dx
  4132 00002752 0FB6FA              <1> 	movzx	edi, dl
  4133 00002755 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  4134 00002759 30F6                <1> 	xor	dh, dh
  4135 0000275B 8A15[E6FB0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  4136 00002761 66F7E2              <1> 	mul	dx
  4137                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  4138 00002764 01C7                <1> 	add	edi, eax ; addr
  4139 00002766 81C700000A00        <1> 	add	edi, 0A0000h
  4140                              <1> 	;shl	si, 3 ; car * 8
  4141 0000276C 30E4                <1> 	xor	ah, ah
  4142 0000276E A0[E6FB0000]        <1> 	mov	al, [CHAR_HEIGHT]
  4143 00002773 66F7E6              <1> 	mul	si
  4144 00002776 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 00002779 A1[56410100]        <1> 	mov	eax, [VGA_INT43H]
  4151 0000277E 3D[241E0100]        <1> 	cmp	eax, vgafont16
  4152 00002783 740F                <1>         je      short wgfxl_0
  4153 00002785 3D[24100100]        <1> 	cmp	eax, vgafont14
  4154 0000278A 7408                <1> 	je	short wgfxl_0
  4155 0000278C 81C6[24080100]      <1> 	add	esi, vgafont8
  4156 00002792 EB02                <1> 	jmp	short wgfxl_1
  4157                              <1> wgfxl_0:
  4158 00002794 01C6                <1> 	add	esi, eax
  4159                              <1> wgfxl_1:
  4160 00002796 28FF                <1> 	sub	bh, bh ; i = 0
  4161                              <1> wgfxl_2:
  4162                              <1> 	; for(i=0;i<8;i++)
  4163 00002798 57                  <1> 	push	edi ; addr
  4164 00002799 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  4165 000027A0 F6E7                <1> 	mul	bh ; nbcols*i
  4166 000027A2 66C1E003            <1> 	shl	ax, 3 ; i*nbcols*8
  4167                              <1>  	; dest=addr+i*nbcols*8;
  4168 000027A6 01C7                <1> 	add	edi, eax ; dest + j ; j = 0
  4169 000027A8 B180                <1> 	mov	cl, 80h ; mask = 0x80;
  4170                              <1> 	; esi = fdata + src + i
  4171                              <1> 	; for(j=0;j<8;j++)
  4172 000027AA 29D2                <1> 	sub	edx, edx ; j = 0
  4173                              <1> wgfxl_3:
  4174 000027AC 8A06                <1> 	mov	al, [esi] ; al = fdata[src+i]
  4175 000027AE 20C8                <1> 	and	al, cl ; if (fdata[src+i] & mask)
  4176 000027B0 7402                <1> 	jz	short wgfxl_4  ; data = 0, zf = 1
  4177 000027B2 88D8                <1> 	mov	al, bl ; data = attr;
  4178                              <1> wgfxl_4:
  4179                              <1> 	; write_byte(0xa000,dest+j,data);		
  4180 000027B4 AA                  <1> 	stosb  ; dest + j (+ 0A0000h)
  4181                              <1> 	;inc	dl ; j++
  4182                              <1> 	;cmp	dl, 8
  4183 000027B5 80FA07              <1> 	cmp	dl, 7
  4184 000027B8 720E                <1> 	jb	short wgfxl_5
  4185 000027BA 5F                  <1> 	pop	edi
  4186                              <1> 	; 08/08/2016
  4187                              <1> 	;cmp	bh, 7
  4188                              <1> 	;jnb	short wgfxl_6
  4189 000027BB FEC7                <1> 	inc	bh ; i++
  4190 000027BD 3A3D[E6FB0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  4191 000027C3 7309                <1> 	jnb	short wgfxl_6
  4192 000027C5 46                  <1> 	inc	esi
  4193 000027C6 EBD0                <1> 	jmp	short wgfxl_2
  4194                              <1> wgfxl_5:
  4195 000027C8 D0E9                <1> 	shr	cl, 1 ; mask >>= 1;
  4196 000027CA FEC2                <1> 	inc	dl ; j++
  4197 000027CC EBDE                <1>         jmp     short wgfxl_3
  4198                              <1> wgfxl_6:
  4199 000027CE 58                  <1> 	pop	eax
  4200 000027CF 5A                  <1> 	pop	edx
  4201 000027D0 5B                  <1> 	pop	ebx
  4202 000027D1 59                  <1> 	pop	ecx
  4203 000027D2 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 000027D3 51                  <1> 	push	ecx
  4222 000027D4 53                  <1> 	push	ebx
  4223 000027D5 52                  <1> 	push	edx
  4224 000027D6 50                  <1> 	push	eax
  4225                              <1> wgfxpl_f0:
  4226                              <1> 	; switch(cheight)
  4227 000027D7 8A25[E6FB0000]      <1> 	mov	ah, [CHAR_HEIGHT]
  4228 000027DD 80FC10              <1> 	cmp	ah, 16 ; case 16:
  4229 000027E0 7507                <1> 	jne	short wgfxpl_f1
  4230                              <1> 	; fdata = &vgafont16;
  4231 000027E2 BE[241E0100]        <1> 	mov	esi, vgafont16
  4232 000027E7 EB13                <1> 	jmp	short wgfxpl_f3
  4233                              <1> wgfxpl_f1:
  4234 000027E9 80FC0E              <1> 	cmp	ah, 14 ; case 14:
  4235 000027EC 7507                <1> 	jne	short wgfxpl_f2
  4236 000027EE BE[24100100]        <1> 	mov	esi, vgafont14
  4237 000027F3 EB07                <1> 	jmp	short wgfxpl_f3
  4238                              <1> wgfxpl_f2:
  4239                              <1> 	; default:
  4240                              <1> 	;  fdata = &vgafont8;
  4241 000027F5 BE[24080100]        <1> 	mov	esi, vgafont8
  4242 000027FA B408                <1> 	mov	ah, 8	
  4243                              <1> wgfxpl_f3:
  4244                              <1> 	; al = car
  4245 000027FC F6E4                <1> 	mul	ah ; ah = cheight
  4246 000027FE 25FFFF0000          <1> 	and	eax, 0FFFFh ; car * cheight
  4247                              <1> 	; src = car * cheight;
  4248 00002803 01C6                <1> 	add	esi, eax ; esi = fdata[src+i]
  4249                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  4250 00002805 88F0                <1> 	mov	al, dh ; ycurs
  4251 00002807 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4252 0000280D F6E4                <1> 	mul	ah
  4253                              <1> 	; 08/08/2016
  4254                              <1> 	;shl	ax, 6 ; * 64
  4255 0000280F 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 00002813 0FB6FA              <1> 	movzx	edi, dl
  4260 00002816 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  4261 0000281A 30F6                <1> 	xor	dh, dh
  4262 0000281C 8A15[E6FB0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  4263 00002822 66F7E2              <1> 	mul	dx
  4264                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  4265 00002825 01C7                <1> 	add	edi, eax ; addr
  4266 00002827 81C700000A00        <1> 	add	edi, 0A0000h
  4267                              <1> 	;
  4268                              <1> 	; outw(VGAREG_SEQU_ADDRESS, 0x0f02);
  4269                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  4270 0000282D 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4271 00002831 66B8020F            <1> 	mov	ax, 0F02h
  4272 00002835 66EF                <1> 	out	dx, ax
  4273 00002837 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4274 0000283B 66B80502            <1> 	mov	ax, 0205h
  4275 0000283F 66EF                <1> 	out	dx, ax
  4276                              <1> 	;
  4277 00002841 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4278 00002845 F6C380              <1> 	test	bl, 80h ; if(attr&0x80)
  4279 00002848 7406                <1> 	jz	short wgfxpl_f4 ; else
  4280                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x1803);
  4281 0000284A 66B80318            <1> 	mov	ax, 1803h
  4282 0000284E EB04                <1> 	jmp	short wgfxpl_f5
  4283                              <1> wgfxpl_f4:
  4284                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0003);
  4285 00002850 66B80300            <1> 	mov	ax, 0003h	
  4286                              <1> wgfxpl_f5:
  4287 00002854 66EF                <1> 	out	dx, ax
  4288                              <1> 	;	
  4289 00002856 28FF                <1> 	sub	bh, bh ; i = 0
  4290                              <1> wgfxpl_0:
  4291                              <1> 	; for(i=0;i<cheight;i++)
  4292 00002858 57                  <1> 	push	edi ; addr
  4293 00002859 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  4294 00002860 F6E7                <1> 	mul	bh ; nbcols*i
  4295                              <1> 	; dest=addr+i*nbcols
  4296 00002862 01C7                <1> 	add	edi, eax ; dest
  4297 00002864 B580                <1> 	mov	ch, 80h ; mask = 0x80;
  4298                              <1> 	; for(j=0;j<8;j++)
  4299 00002866 28C9                <1> 	sub	cl, cl ; j = 0
  4300                              <1> wgfxpl_1:
  4301 00002868 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 0000286A 88EC                <1> 	mov	ah, ch
  4307 0000286C B008                <1> 	mov	al, 8
  4308 0000286E 66EF                <1> 	out	dx, ax
  4309 00002870 8A07                <1> 	mov	al, [edi] ; ? (io delay?)
  4310                              <1> 	;
  4311 00002872 28C0                <1> 	sub	al, al ; attr = 0
  4312                              <1> 	; if (fdata[src+i] & mask)
  4313 00002874 842E                <1> 	test	byte [esi], ch
  4314 00002876 7404                <1> 	jz	short wgfxpl_2  ; zf = 1
  4315                              <1> 	; write_byte(0xa000,dest,attr&0x0f);
  4316 00002878 88D8                <1> 	mov	al, bl ; attr;
  4317 0000287A 240F                <1> 	and	al, 0Fh	; attr&0x0f
  4318                              <1> wgfxpl_2:
  4319                              <1> 	; write_byte(0xa000,dest,0x00);		
  4320 0000287C 8807                <1> 	mov	[edi], al ; dest (+ 0A0000h)
  4321 0000287E FEC1                <1> 	inc	cl ; j++
  4322 00002880 80F908              <1> 	cmp	cl, 8
  4323 00002883 72E3                <1> 	jb	short wgfxpl_1
  4324 00002885 5F                  <1> 	pop	edi
  4325                              <1> 	; 08/08/2016
  4326                              <1> 	;cmp	bh, 7
  4327                              <1> 	;jnb	short wgfxpl_3
  4328 00002886 FEC7                <1> 	inc	bh ; i++
  4329 00002888 3A3D[E6FB0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  4330 0000288E 7303                <1> 	jnb	short wgfxpl_3
  4331 00002890 46                  <1> 	inc	esi
  4332 00002891 EBC5                <1> 	jmp	short wgfxpl_0
  4333                              <1> wgfxpl_3:
  4334                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4335 00002893 66B808FF            <1>   	mov	ax, 0FF08h
  4336 00002897 66EF                <1> 	out	dx, ax
  4337 00002899 66B80500            <1> 	mov	ax, 0005h
  4338 0000289D 66EF                <1> 	out	dx, ax
  4339 0000289F 66B80300            <1> 	mov	ax, 0003h
  4340 000028A3 66EF                <1> 	out	dx, ax
  4341                              <1> 	;
  4342 000028A5 58                  <1> 	pop	eax
  4343 000028A6 5A                  <1> 	pop	edx
  4344 000028A7 5B                  <1> 	pop	ebx
  4345 000028A8 59                  <1> 	pop	ecx
  4346 000028A9 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 000028AA 88C3                <1> 	mov	bl, al ; pixel value
  4365                              <1> 	;mov 	ah, [CRT_MODE]
  4366 000028AC BE[FEFB0000]        <1> 	mov	esi, vga_modes
  4367 000028B1 89F7                <1> 	mov	edi, esi
  4368 000028B3 83C710              <1> 	add	edi, vga_mode_count
  4369                              <1> vga_wp_0:
  4370 000028B6 AC                  <1> 	lodsb
  4371 000028B7 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4372 000028B9 7405                <1> 	je	short vga_wp_1
  4373 000028BB 39FE                <1> 	cmp	esi, edi
  4374 000028BD 72F7                <1> 	jb	short vga_wp_0
  4375 000028BF C3                  <1> 	retn	; nothing to do
  4376                              <1> vga_wp_1:
  4377 000028C0 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4378                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4379 000028C3 BF00000A00          <1> 	mov	edi, 0A0000h
  4380                              <1> 	;
  4381 000028C8 803E04              <1> 	cmp	byte [esi], PLANAR4
  4382 000028CB 741D                <1> 	je	short vga_wp_planar
  4383 000028CD 803E03              <1> 	cmp	byte [esi], PLANAR1
  4384 000028D0 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 000028D2 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4388 000028D9 66C1E003            <1>      	shl	ax, 3 ; * 8
  4389 000028DD 66F7E2              <1> 	mul	dx
  4390 000028E0 50                  <1> 	push	eax
  4391                              <1> 	;mov	edi, 0A0000h
  4392 000028E1 6601CF              <1> 	add	di, cx
  4393 000028E4 58                  <1> 	pop	eax
  4394 000028E5 01C7                <1> 	add	edi, eax ; addr
  4395                              <1> 	; write_byte(0xa000,addr,AL);
  4396 000028E7 881F                <1> 	mov	[edi], bl
  4397 000028E9 C3                  <1> 	retn    
  4398                              <1> vga_wp_planar:
  4399                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  4400 000028EA 0FB7C1              <1> 	movzx	eax, cx
  4401 000028ED 66C1E803            <1> 	shr	ax, 3 ; CX/8
  4402 000028F1 50                  <1> 	push	eax
  4403 000028F2 28E4                <1> 	sub	ah, ah ; 0
  4404 000028F4 A0[E4FB0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4405 000028F9 66F7E2              <1> 	mul	dx
  4406                              <1> 	;mov	edi, 0A0000h
  4407 000028FC 6601C7              <1>         add     di, ax
  4408 000028FF 58                  <1> 	pop	eax
  4409 00002900 01C7                <1> 	add	edi, eax ; addr
  4410 00002902 80E107              <1> 	and	cl, 7
  4411 00002905 B580                <1> 	mov	ch, 80h ; mask
  4412 00002907 D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  4413                              <1> 	
  4414                              <1> 	; outw(VGAREG_GRDC_ADDRESS, (mask << 8) | 0x08);
  4415 00002909 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4416 0000290D 88EC                <1> 	mov	ah, ch
  4417 0000290F B008                <1> 	mov	al, 8
  4418 00002911 66EF                <1> 	out	dx, ax
  4419                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  4420 00002913 66B80502            <1> 	mov	ax, 0205h
  4421 00002917 66EF                <1> 	out	dx, ax
  4422                              <1> 	; data = read_byte(0xa000,addr);
  4423 00002919 8A07                <1> 	mov	al, [edi] ; (delay?)	
  4424                              <1> 	; if (AL & 0x80)
  4425                              <1> 	; {
  4426                              <1> 	;  outw(VGAREG_GRDC_ADDRESS, 0x1803);
  4427                              <1> 	; }
  4428 0000291B F6C380              <1> 	test	bl, 80h
  4429 0000291E 7406                <1> 	jz	short vga_wp_2
  4430 00002920 66B80318            <1> 	mov	ax, 1803h
  4431 00002924 66EF                <1> 	out	dx, ax
  4432                              <1> vga_wp_2:	
  4433                              <1> 	; write_byte(0xa000,addr,AL);
  4434 00002926 881F                <1> 	mov	[edi], bl
  4435                              <1> 	;
  4436                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4437 00002928 66B808FF            <1>   	mov	ax, 0FF08h
  4438 0000292C 66EF                <1> 	out	dx, ax
  4439 0000292E 66B80500            <1> 	mov	ax, 0005h
  4440 00002932 66EF                <1> 	out	dx, ax
  4441 00002934 66B80300            <1> 	mov	ax, 0003h
  4442 00002938 66EF                <1> 	out	dx, ax
  4443                              <1> 	;
  4444 0000293A 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 0000293B BE[FEFB0000]        <1> 	mov	esi, vga_modes
  4463 00002940 89F7                <1> 	mov	edi, esi
  4464 00002942 83C710              <1> 	add	edi, vga_mode_count
  4465                              <1> vga_rp_0:
  4466 00002945 AC                  <1> 	lodsb
  4467 00002946 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4468 00002948 7405                <1> 	je	short vga_rp_1
  4469 0000294A 39FE                <1> 	cmp	esi, edi
  4470 0000294C 72F7                <1> 	jb	short vga_rp_0
  4471 0000294E C3                  <1> 	retn	; nothing to do
  4472                              <1> vga_rp_1:
  4473 0000294F 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4474                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4475 00002952 BF00000A00          <1> 	mov	edi, 0A0000h
  4476                              <1> 	;
  4477 00002957 803E04              <1> 	cmp	byte [esi], PLANAR4
  4478 0000295A 741D                <1> 	je	short vga_rp_planar
  4479 0000295C 803E03              <1> 	cmp	byte [esi], PLANAR1
  4480 0000295F 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 00002961 0FB605[E4FB0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4484 00002968 66C1E003            <1>      	shl	ax, 3 ; * 8
  4485 0000296C 66F7E2              <1> 	mul	dx
  4486 0000296F 50                  <1> 	push	eax
  4487                              <1> 	;mov	edi, 0A0000h
  4488 00002970 6601CF              <1> 	add	di, cx
  4489 00002973 58                  <1> 	pop	eax
  4490 00002974 01C7                <1> 	add	edi, eax ; addr
  4491                              <1> 	; attr=read_byte(0xa000,addr);
  4492 00002976 8A07                <1> 	mov	al, [edi] ; pixel value
  4493 00002978 C3                  <1> 	retn    
  4494                              <1> vga_rp_planar:
  4495                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  4496 00002979 0FB7C1              <1> 	movzx	eax, cx
  4497 0000297C 66C1E803            <1> 	shr	ax, 3 ; CX/8
  4498 00002980 50                  <1> 	push	eax
  4499 00002981 28E4                <1> 	sub	ah, ah ; 0
  4500 00002983 A0[E4FB0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4501 00002988 66F7E2              <1> 	mul	dx
  4502                              <1> 	;mov	edi, 0A0000h
  4503 0000298B 6601C7              <1>         add     di, ax
  4504 0000298E 58                  <1> 	pop	eax
  4505 0000298F 01C7                <1> 	add	edi, eax ; addr
  4506 00002991 80E107              <1> 	and	cl, 7
  4507 00002994 B580                <1> 	mov	ch, 80h ; mask
  4508 00002996 D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  4509                              <1> 	; attr = 0x00;
  4510 00002998 30DB                <1> 	xor	bl, bl ; attr = bl = 0, 
  4511 0000299A 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 0000299C 88CC                <1> 	mov	ah, cl ; i << 8
  4520 0000299E B004                <1> 	mov	al, 4  ; | 0x04
  4521 000029A0 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4522 000029A4 66EF                <1> 	out	dx, ax
  4523                              <1> 	; data = read_byte(0xa000,addr) & mask;
  4524 000029A6 8A07                <1> 	mov	al, [edi]
  4525 000029A8 20E8                <1> 	and	al, ch ; & mask
  4526                              <1> 	; if (data > 0) attr |= (0x01 << i);
  4527 000029AA 08C0                <1> 	or	al, al
  4528 000029AC 7408                <1> 	jz	short vga_rp_3 ; al = 0 
  4529 000029AE B701                <1> 	mov	bh, 1
  4530 000029B0 D2E7                <1> 	shl	bh, cl ; (0x01 << i)
  4531 000029B2 08FB                <1> 	or	bl, bh ; attr |= (0x01 << i)
  4532 000029B4 88D8                <1> 	mov	al, bl ; pixel value	
  4533                              <1> vga_rp_3:	
  4534 000029B6 C3                  <1> 	retn
  4535                              <1> 
  4536                              <1> vga_beeper:
  4537                              <1> 	; 04/08/2016  (TRDOS 386 = TRDOS v2.0)
  4538 000029B7 FB                  <1> 	sti
  4539                              <1> 	;mov	bh, [ACTIVE_PAGE]
  4540 000029B8 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 000029BD 8A25[E2FB0000]      <1> 	mov 	ah, [CRT_MODE]
  4569 000029C3 88C7                <1> 	mov	bh, al ; character
  4570 000029C5 668B15[C6330100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  4571                              <1> 
  4572 000029CC BE[06FC0000]        <1> 	mov	esi, vga_g_modes
  4573 000029D1 89F7                <1> 	mov	edi, esi
  4574 000029D3 83C708              <1> 	add	edi, vga_g_mode_count
  4575                              <1> vga_wtty_0:
  4576 000029D6 AC                  <1> 	lodsb
  4577 000029D7 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4578 000029D9 7405                <1> 	je	short vga_wtty_2
  4579 000029DB 39FE                <1> 	cmp	esi, edi
  4580 000029DD 72F7                <1> 	jb	short vga_wtty_0
  4581                              <1> vga_wtty_1:
  4582 000029DF C3                  <1> 	retn	; nothing to do
  4583                              <1> vga_wtty_2:
  4584 000029E0 80FF07              <1> 	cmp	bh, 07h ; bell (beep)
  4585 000029E3 74D2                <1> 	je	short vga_beeper  ; u11
  4586 000029E5 80FF08              <1> 	cmp	bh, 08h ; backspace
  4587 000029E8 7508                <1> 	jne	short vga_wtty_3
  4588                              <1> 	; if(xcurs>0)xcurs--;
  4589 000029EA 08D2                <1> 	or	dl, dl ; xcurs (column)
  4590 000029EC 74F1                <1> 	jz	short vga_wtty_1
  4591 000029EE FECA                <1> 	dec	dl ; xcurs--;
  4592 000029F0 EB59                <1>         jmp     short vga_wtty_12 
  4593                              <1> vga_wtty_3:			
  4594 000029F2 80FF0D              <1> 	cmp	bh, 0Dh ; carriage return (\r)
  4595 000029F5 7504                <1> 	jne	short vga_wtty_4
  4596                              <1> 	; xcurs=0;
  4597 000029F7 28D2                <1> 	sub	dl, dl ; 0
  4598 000029F9 EB50                <1>         jmp     short vga_wtty_12 
  4599                              <1> vga_wtty_4:	
  4600 000029FB 80FF0A              <1> 	cmp	bh, 0Ah ; new line (\n)
  4601 000029FE 7504                <1> 	jne	short vga_wtty_5
  4602                              <1> 	; ycurs++;
  4603 00002A00 FEC6                <1> 	inc	dh ; next row
  4604 00002A02 EB62                <1>         jmp     short vga_wtty_11
  4605                              <1> vga_wtty_5:
  4606 00002A04 80FF09              <1> 	cmp 	bh, 09h ; tab stop
  4607 00002A07 7527                <1> 	jne	short vga_wtty_8
  4608 00002A09 88D0                <1> 	mov	al, dl
  4609 00002A0B 6698                <1> 	cbw
  4610 00002A0D B108                <1> 	mov	cl, 8
  4611 00002A0F F6F1                <1> 	div	cl
  4612 00002A11 28E1                <1> 	sub	cl, ah
  4613                              <1> 	;
  4614 00002A13 B720                <1> 	mov	bh, 20h ; space
  4615                              <1> vga_wtty_6: ; tab stop loop
  4616 00002A15 6651                <1> 	push	cx
  4617 00002A17 6653                <1> 	push	bx
  4618 00002A19 E812000000          <1> 	call	vga_wtty_8
  4619 00002A1E 665B                <1> 	pop	bx  ; bh = character, bl = color
  4620 00002A20 6659                <1> 	pop	cx
  4621 00002A22 FEC9                <1> 	dec	cl
  4622 00002A24 7409                <1> 	jz	short vga_wtty_7
  4623 00002A26 668B15[C6330100]    <1> 	mov	dx, [CURSOR_POSN] ; new cursor position (pg 0)
  4624 00002A2D EBE6                <1> 	jmp	short vga_wtty_6
  4625                              <1> vga_wtty_7:
  4626 00002A2F C3                  <1> 	retn
  4627                              <1> 	;
  4628                              <1> vga_wtty_8:
  4629 00002A30 83C64F              <1> 	add	esi, vga_g_memmodel - (vga_g_modes + 1)  
  4630                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4631 00002A33 BF00000A00          <1> 	mov	edi, 0A0000h
  4632                              <1> 	;
  4633 00002A38 88F8                <1> 	mov	al, bh ; character
  4634                              <1> 	;
  4635 00002A3A 803E04              <1> 	cmp	byte [esi], PLANAR4
  4636 00002A3D 7414                <1> 	je	short vga_wtty_planar
  4637 00002A3F 803E03              <1> 	cmp	byte [esi], PLANAR1
  4638 00002A42 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 00002A44 E8F3FCFFFF          <1> 	call	write_gfx_char_lin
  4644 00002A49 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 00002A4B 668915[C6330100]    <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 00002A52 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 00002A53 E87BFDFFFF          <1> 	call	write_gfx_char_pl4
  4667                              <1> vga_wtty_9:
  4668 00002A58 FEC2                <1> 	inc	dl ; xcurs++;
  4669                              <1> vga_wtty_10:
  4670                              <1> 	; Do we need to wrap ?
  4671                              <1> 	; if(xcurs==nbcols)
  4672 00002A5A 3A15[E4FB0000]      <1> 	cmp	dl, [CRT_COLS] ; [VGA_COLS]
  4673 00002A60 7204                <1> 	jb	short vga_wtty_11 ; no
  4674 00002A62 28D2                <1> 	sub	dl, dl ; xcurs=0;
  4675 00002A64 FEC6                <1> 	inc	dh ;  ycurs++;
  4676                              <1> vga_wtty_11:
  4677                              <1> 	; Do we need to scroll ?
  4678                              <1> 	; if(ycurs==nbrows)
  4679 00002A66 3A35[EAFB0000]      <1> 	cmp	dh, [VGA_ROWS]
  4680 00002A6C 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 00002A6E B001                <1> 	mov	al, 1
  4688 00002A70 28DB                <1> 	sub	bl, bl ; 0 ; blank/black line (attr=0) will be used
  4689 00002A72 6629C9              <1> 	sub	cx, cx ; 0,0
  4690                              <1> 
  4691                              <1> 	; 06/08/2016
  4692 00002A75 8A35[EAFB0000]      <1> 	mov	dh, [VGA_ROWS]
  4693 00002A7B FECE                <1> 	dec	dh ; nbrows -1
  4694                              <1> 
  4695 00002A7D 6652                <1> 	push	dx 	; 04/08/2016
  4696 00002A7F 8A15[E4FB0000]      <1> 	mov	dl, [CRT_COLS]
  4697 00002A85 FECA                <1> 	dec	dl ; nbcols -1
  4698                              <1> 	
  4699 00002A87 8A25[E2FB0000]      <1> 	mov	ah, [CRT_MODE]
  4700                              <1> 	
  4701                              <1> 	; biosfn_scroll(0x01,0x00,0,0,nbrows-1,nbcols-1,page,SCROLL_UP);
  4702 00002A8D E808F5FFFF          <1> 	call	vga_graphics_up
  4703                              <1> 	; 04/08/2016
  4704 00002A92 665A                <1> 	pop	dx
  4705                              <1> 	;dec	dh ; ycurs-=1
  4706 00002A94 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 00002A96 08C0                <1> 	or	al, al ; 0
  4736 00002A98 7404                <1> 	jz	short font_setup_0
  4737 00002A9A 3C10                <1> 	cmp	al, 10h
  4738 00002A9C 7511                <1> 	jne	short font_setup_1	
  4739                              <1> font_setup_0:
  4740 00002A9E E8B7000000          <1> 	call	transfer_user_fonts
  4741 00002AA3 721C                <1> 	jc	short font_setup_error
  4742 00002AA5 E8C2000000          <1> 	call	load_text_user_pat
  4743 00002AAA 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 00002AAF 3C01                <1> 	cmp	al, 1
  4751 00002AB1 7404                <1> 	je	short font_setup_2
  4752 00002AB3 3C11                <1> 	cmp	al, 11h
  4753 00002AB5 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 00002AB7 E8EE010000          <1> 	call	load_text_8_14_pat
  4758 00002ABC E984EAFFFF          <1>         jmp     VIDEO_RETURN
  4759                              <1> font_setup_error:
  4760 00002AC1 29C0                <1> 	sub	eax, eax ; 0 -> fonts could not be loaded
  4761 00002AC3 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 00002AC8 3C02                <1> 	cmp	al, 2
  4769 00002ACA 7404                <1> 	je	short font_setup_4
  4770 00002ACC 3C12                <1> 	cmp	al, 12h
  4771 00002ACE 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 00002AD0 E805020000          <1> 	call	load_text_8_8_pat
  4776 00002AD5 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 00002ADA 3C04                <1> 	cmp	al, 4
  4784 00002ADC 7404                <1> 	je	short font_setup_6
  4785 00002ADE 3C14                <1> 	cmp	al, 14h
  4786 00002AE0 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 00002AE2 E823020000          <1> 	call	load_text_8_16_pat
  4791 00002AE7 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 00002AEC 3C21                <1> 	cmp	al, 21h
  4815 00002AEE 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 00002AF0 20F6                <1> 	and	dh, dh
  4822 00002AF2 7405                <1> 	jz	short font_setup_8 ; 256 characters
  4823 00002AF4 80FE80              <1> 	cmp	dh, 80h ; 128 characters
  4824 00002AF7 75C8                <1> 	jne	short font_setup_error ; invalid !
  4825                              <1> font_setup_8:
  4826 00002AF9 E85C000000          <1> 	call	transfer_user_fonts
  4827 00002AFE 72C1                <1> 	jc	short font_setup_error
  4828                              <1> 	; ebp = user's font data address in system's memory space
  4829 00002B00 E836020000          <1> 	call	load_gfx_user_chars
  4830 00002B05 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 00002B0A 3C22                <1> 	cmp	al, 22h
  4836 00002B0C 750A                <1> 	jne	short font_setup_10
  4837 00002B0E E866020000          <1> 	call	load_gfx_8_14_chars	
  4838 00002B13 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 00002B18 3C23                <1> 	cmp	al, 23h
  4844 00002B1A 750A                <1> 	jne	short font_setup_11
  4845 00002B1C E899020000          <1> 	call	load_gfx_8_8_chars	
  4846 00002B21 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 00002B26 3C24                <1> 	cmp	al, 24h
  4852 00002B28 750A                <1> 	jne	short font_setup_12
  4853 00002B2A E8CC020000          <1> 	call	load_gfx_8_16_chars	
  4854 00002B2F 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 00002B34 3C30                <1> 	cmp	al, 30h
  4860 00002B36 750A                <1> 	jne	short font_setup_13			
  4861 00002B38 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 00002B3D E908EAFFFF          <1>         jmp     _video_return
  4865                              <1> font_setup_13:
  4866 00002B42 3C03                <1> 	cmp	al, 03h ; AX = 1103h	
  4867 00002B44 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 00002B46 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4873                              <1> 	;mov	ah, bl
  4874 00002B4A 28E4                <1> 	sub	ah, ah ; 0
  4875                              <1> 	;mov	al, 03h
  4876 00002B4C 66EF                <1> 	out	dx, ax
  4877 00002B4E E9F2E9FFFF          <1> 	jmp     VIDEO_RETURN 
  4878                              <1> 	
  4879                              <1> font_setup_14:
  4880 00002B53 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  4881 00002B55 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 00002B5A 89EE                <1> 	mov	esi, ebp ; user buffer
  4889 00002B5C BF00000700          <1> 	mov	edi, Cluster_Buffer  ; system buffer
  4890 00002B61 E884B50000          <1> 	call	transfer_from_user_buffer
  4891                              <1> 	;pop	ecx
  4892                              <1> 	; ecx = transfer (byte) count = character count
  4893 00002B66 BD00000700          <1> 	mov	ebp, Cluster_Buffer
  4894                              <1> 	; jc	VIDEO_RETURN -> failed
  4895 00002B6B 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 00002B6C 50                  <1> 	push	eax
  4924 00002B6D E83C000000          <1> 	call	get_font_access
  4925 00002B72 28DB                <1> 	sub	bl, bl ; i = 0	
  4926                              <1> ltup_1:
  4927 00002B74 88D8                <1> 	mov	al, bl
  4928 00002B76 F6E7                <1> 	mul	bh
  4929 00002B78 0FB7F0              <1> 	movzx	esi, ax
  4930 00002B7B 01EE                <1> 	add	esi, ebp
  4931 00002B7D 88D8                <1> 	mov	al, bl
  4932 00002B7F 28E4                <1> 	sub	ah, ah
  4933 00002B81 6601D0              <1> 	add	ax, dx ; (DX + i)
  4934 00002B84 66C1E005            <1> 	shl	ax, 5  ; * 32
  4935 00002B88 0FB7F8              <1> 	movzx	edi, ax
  4936 00002B8B 81C700000A00        <1> 	add	edi, 0A0000h
  4937 00002B91 51                  <1> 	push	ecx
  4938 00002B92 0FB6CF              <1> 	movzx	ecx, bh 		
  4939 00002B95 F3A4                <1> 	rep	movsb
  4940 00002B97 59                  <1> 	pop	ecx	
  4941 00002B98 FEC3                <1> 	inc	bl
  4942 00002B9A 38CB                <1> 	cmp	bl, cl
  4943 00002B9C 75D6                <1> 	jne	short ltup_1	
  4944                              <1> 	;
  4945 00002B9E E840000000          <1> 	call	release_font_access
  4946                              <1> 	;
  4947 00002BA3 58                  <1> 	pop	eax
  4948                              <1> 	; if(AL>=0x10)
  4949 00002BA4 3C10                <1> 	cmp	al, 10h
  4950 00002BA6 7205                <1> 	jb	short ltup_2
  4951                              <1>    	; set_scan_lines(BH);
  4952 00002BA8 E875000000          <1> 	call	set_scan_lines
  4953                              <1> ltup_2:
  4954 00002BAD 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 00002BAE 52                  <1> 	push	edx
  4966 00002BAF 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4967 00002BB3 66B80001            <1> 	mov	ax, 0100h
  4968 00002BB7 66EF                <1> 	out	dx, ax
  4969 00002BB9 66B80204            <1> 	mov	ax, 0402h
  4970 00002BBD 66EF                <1> 	out	dx, ax
  4971 00002BBF 66B80407            <1> 	mov	ax, 0704h
  4972 00002BC3 66EF                <1> 	out	dx, ax
  4973 00002BC5 66B80003            <1> 	mov	ax, 0300h
  4974 00002BC9 66EF                <1> 	out	dx, ax
  4975 00002BCB 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4976 00002BCF 66B80402            <1> 	mov	ax, 0204h
  4977 00002BD3 66EF                <1> 	out	dx, ax
  4978 00002BD5 66B80500            <1> 	mov	ax, 0005h
  4979 00002BD9 66EF                <1> 	out	dx, ax
  4980 00002BDB 66B80604            <1> 	mov	ax, 0406h
  4981 00002BDF 66EF                <1> 	out	dx, ax
  4982 00002BE1 5A                  <1> 	pop	edx
  4983 00002BE2 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 00002BE3 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4995 00002BE7 66B80001            <1> 	mov	ax, 0100h
  4996 00002BEB 66EF                <1> 	out	dx, ax
  4997 00002BED 66B80203            <1> 	mov	ax, 0302h
  4998 00002BF1 66EF                <1> 	out	dx, ax
  4999 00002BF3 66B80403            <1> 	mov	ax, 0304h
  5000 00002BF7 66EF                <1> 	out	dx, ax
  5001 00002BF9 66B80003            <1> 	mov	ax, 0300h
  5002 00002BFD 66EF                <1> 	out	dx, ax
  5003 00002BFF 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
  5004 00002C03 EC                  <1>  	in	al, dx
  5005 00002C04 2401                <1> 	and	al, 01h
  5006 00002C06 C0E002              <1> 	shl	al, 2
  5007 00002C09 0C0A                <1> 	or	al, 0Ah
  5008 00002C0B 88C4                <1> 	mov	ah, al
  5009 00002C0D B006                <1> 	mov	al, 06h
  5010 00002C0F 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5011 00002C13 66EF                <1> 	out	dx, ax
  5012 00002C15 66B80400            <1> 	mov	ax, 0004h
  5013 00002C19 66EF                <1> 	out	dx, ax
  5014 00002C1B 66B80510            <1> 	mov	ax, 1005h
  5015 00002C1F 66EF                <1> 	out	dx, ax
  5016 00002C21 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 00002C22 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS = 3D4h (always)
  5031 00002C26 B009                <1> 	mov	al, 09h
  5032 00002C28 EE                  <1> 	out	dx, al
  5033                              <1> 	; crtc_r9 = inb(crtc_addr+1);
  5034 00002C29 6642                <1> 	inc	dx ; 3D5h
  5035 00002C2B EC                  <1> 	in	al, dx
  5036                              <1> 	; crtc_r9 = (crtc_r9 & 0xe0) | (lines - 1);
  5037 00002C2C 24E0                <1> 	and	al, 0E0h
  5038 00002C2E FECF                <1> 	dec	bh ; lines - 1
  5039 00002C30 08F8                <1> 	or	al, bh
  5040                              <1> 	; outb(crtc_addr+1, crtc_r9);
  5041 00002C32 EE                  <1> 	out	dx, al
  5042                              <1> 	;inc	bh 
  5043                              <1> 	; if(lines==8)
  5044                              <1> 	;cmp	bh, 8
  5045 00002C33 80FF07              <1> 	cmp	bh, 7
  5046 00002C36 7506                <1> 	jne	short ssl_1
  5047                              <1> 	; biosfn_set_cursor_shape(0x06,0x07);
  5048 00002C38 66B90706            <1> 	mov	cx, 0607h
  5049 00002C3C EB06                <1> 	jmp	short ssl_2
  5050                              <1> ssl_1:
  5051                              <1> 	; biosfn_set_cursor_shape(lines-4,lines-3);
  5052 00002C3E 88F9                <1> 	mov	cl, bh ; lines - 1
  5053 00002C40 88CD                <1> 	mov	ch, cl ; lines - 1 (16 -> 15)
  5054 00002C42 FECD                <1> 	dec	ch  ; lines - 2 (16 -> 14)
  5055                              <1> ssl_2:
  5056                              <1> 	; CH = start line, CL = stop line
  5057 00002C44 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
  5058 00002C46 66890D[FBFB0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
  5059 00002C4D E812F1FFFF          <1> 	call	m16	; output cx register
  5060                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT, lines);
  5061 00002C52 FEC7                <1> 	inc	bh ; lines
  5062 00002C54 883D[E6FB0000]      <1> 	mov	[CHAR_HEIGHT], bh
  5063                              <1> 	;  outb(crtc_addr, 0x12);
  5064 00002C5A 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS
  5065 00002C5E B012                <1> 	mov	al, 12h
  5066 00002C60 EE                  <1> 	out	dx, al
  5067                              <1> 	; vde = inb(crtc_addr+1);
  5068 00002C61 6642                <1> 	inc	dx
  5069 00002C63 EC                  <1> 	in	al, dx
  5070 00002C64 88C4                <1> 	mov	ah, al
  5071                              <1> 	; outb(crtc_addr, 0x07);
  5072 00002C66 664A                <1> 	dec	dx
  5073 00002C68 B007                <1> 	mov	al, 07h
  5074 00002C6A EE                  <1> 	out	dx, al
  5075                              <1> 	; ovl = inb(crtc_addr+1);
  5076 00002C6B 6642                <1> 	inc	dx
  5077 00002C6D EC                  <1> 	in	al, dx
  5078                              <1> 	; vde += (((ovl & 0x02) << 7) + ((ovl & 0x40) << 3) + 1);
  5079 00002C6E 88E2                <1> 	mov	dl, ah ; vde
  5080 00002C70 88C6                <1> 	mov	dh, al ; ovl
  5081 00002C72 6683E002            <1> 	and	ax, 02h
  5082 00002C76 66C1E007            <1> 	shl	ax, 7
  5083 00002C7A 6689C1              <1> 	mov	cx, ax ; (ovl & 0x02) << 7)	
  5084 00002C7D 88F0                <1> 	mov	al, dh ; ovl
  5085 00002C7F 6683E040            <1> 	and	ax, 40h			
  5086 00002C83 66C1E003            <1> 	shl	ax, 3  ; (ovl & 0x40) << 3)
  5087 00002C87 6640                <1> 	inc	ax ; + 1 
  5088 00002C89 6601C8              <1> 	add	ax, cx
  5089 00002C8C 30F6                <1> 	xor	dh, dh
  5090 00002C8E 6601D0              <1> 	add	ax, dx ; + vde
  5091                              <1> 	; rows = vde / lines;
  5092 00002C91 F6F7                <1> 	div	bh
  5093                              <1> 	;dec	al ; rows -1
  5094                              <1> 	; write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, rows-1);
  5095 00002C93 A2[EAFB0000]        <1> 	mov	[VGA_ROWS], al ; rows (not 'rows-1' !)
  5096                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE, rows * cols * 2);
  5097 00002C98 8A25[E4FB0000]      <1> 	mov	ah, [CRT_COLS]
  5098 00002C9E F6E4                <1> 	mul	ah
  5099 00002CA0 66D1E0              <1> 	shl	ax, 1
  5100 00002CA3 66A3[44410100]      <1> 	mov 	[CRT_LEN], ax	
  5101 00002CA9 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 00002CAA 50                  <1> 	push	eax
  5132 00002CAB 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 00002CB0 28DB                <1> 	sub	bl, bl ; i = 0
  5147 00002CB2 B70E                <1> 	mov	bh, 14
  5148 00002CB4 BE[24100100]        <1> 	mov	esi, vgafont14
  5149 00002CB9 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 00002CBE 0FB6CF              <1> 	movzx	ecx, bh 		
  5162 00002CC1 F3A4                <1> 	rep	movsb
  5163 00002CC3 83C712              <1> 	add	edi, 18 ; 32 - 14
  5164 00002CC6 FEC3                <1> 	inc	bl
  5165 00002CC8 75F4                <1> 	jnz	short lt8_14_1	
  5166                              <1> 	;
  5167 00002CCA E814FFFFFF          <1> 	call	release_font_access
  5168                              <1> 	;
  5169 00002CCF 58                  <1> 	pop	eax
  5170                              <1> 	; if(AL>=0x10)
  5171 00002CD0 3C10                <1> 	cmp	al, 10h
  5172 00002CD2 7205                <1> 	jb	short lt8_14_4
  5173                              <1> 	; BH = 14
  5174                              <1>    	; set_scan_lines(14);
  5175 00002CD4 E849FFFFFF          <1> 	call	set_scan_lines
  5176                              <1> lt8_14_4:
  5177 00002CD9 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 00002CDA 50                  <1> 	push	eax
  5208 00002CDB 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 00002CE0 28DB                <1> 	sub	bl, bl ; i = 0
  5223 00002CE2 B708                <1> 	mov	bh, 8
  5224 00002CE4 BE[24080100]        <1> 	mov	esi, vgafont8
  5225 00002CE9 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 00002CEE 0FB6CF              <1> 	movzx	ecx, bh 		
  5238 00002CF1 F3A4                <1> 	rep	movsb
  5239 00002CF3 83C718              <1> 	add	edi, 24 ; 32 - 8
  5240 00002CF6 FEC3                <1> 	inc	bl
  5241 00002CF8 75F4                <1> 	jnz	short lt8_8_1	
  5242                              <1> 	;
  5243 00002CFA E8E4FEFFFF          <1> 	call	release_font_access
  5244                              <1> 	;
  5245 00002CFF 58                  <1> 	pop	eax
  5246                              <1> 	; if(AL>=0x10)
  5247 00002D00 3C10                <1> 	cmp	al, 10h
  5248 00002D02 7205                <1> 	jb	short lt8_8_2
  5249                              <1> 	; BH = 8
  5250                              <1>    	; set_scan_lines(8);
  5251 00002D04 E819FFFFFF          <1> 	call	set_scan_lines
  5252                              <1> lt8_8_2:
  5253 00002D09 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 00002D0A 50                  <1> 	push	eax
  5284 00002D0B 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 00002D10 28DB                <1> 	sub	bl, bl ; i = 0
  5299 00002D12 B710                <1> 	mov	bh, 16
  5300 00002D14 BE[241E0100]        <1> 	mov	esi, vgafont16
  5301 00002D19 BF00000A00          <1> 	mov	edi, 0A0000h
  5302 00002D1E 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 00002D21 89C1                <1> 	mov	ecx, eax ; 16	
  5316 00002D23 F3A4                <1> 	rep	movsb
  5317 00002D25 01C7                <1> 	add	edi, eax ; add edi, 16
  5318 00002D27 FEC3                <1> 	inc	bl
  5319 00002D29 75F6                <1> 	jnz	short lt8_16_1
  5320                              <1> 	;
  5321 00002D2B E8B3FEFFFF          <1> 	call	release_font_access
  5322                              <1> 	;
  5323 00002D30 58                  <1> 	pop	eax
  5324                              <1> 	; if(AL>=0x10)
  5325 00002D31 3C10                <1> 	cmp	al, 10h
  5326 00002D33 7205                <1> 	jb	short lt8_16_2
  5327                              <1> 	; BH = 16
  5328                              <1>    	; set_scan_lines(16);
  5329 00002D35 E8E8FEFFFF          <1> 	call	set_scan_lines
  5330                              <1> lt8_16_2:
  5331 00002D3A 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 00002D3B 31C0                <1> 	xor	eax, eax
  5348 00002D3D 48                  <1> 	dec	eax ; 0FFFFFFFFh (user defined fonts)
  5349 00002D3E A3[56410100]        <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 00002D43 20DB                <1> 	and	bl, bl
  5367 00002D45 7508                <1> 	jnz	short l_gfx_uc_1
  5368 00002D47 8815[EAFB0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5369 00002D4D 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 00002D4F FECB                <1> 	dec	bl
  5375 00002D51 7509                <1> 	jnz	short l_gfx_uc_2
  5376                              <1> 	; bl = 1
  5377 00002D53 C605[EAFB0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5378 00002D5A EB16                <1> 	jmp	short l_gfx_uc_4 	
  5379                              <1> l_gfx_uc_2:
  5380 00002D5C FECB                <1> 	dec	bl
  5381 00002D5E 740B                <1> 	jz	short l_gfx_uc_3 ; bl = 2
  5382 00002D60 FECB                <1> 	dec	bl
  5383 00002D62 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 00002D64 C605[EAFB0000]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 00002D6B C605[EAFB0000]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 00002D72 880D[E6FB0000]      <1> 	mov	[CHAR_HEIGHT], cl
  5400                              <1> 	; }
  5401 00002D78 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 00002D79 C705[56410100]-     <1> 	mov	dword [VGA_INT43H], vgafont14
  5417 00002D7F [24100100]          <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 00002D83 20DB                <1> 	and	bl, bl
  5430 00002D85 7508                <1> 	jnz	short l_gfx_8_14c_1
  5431 00002D87 8815[EAFB0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5432 00002D8D 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 00002D8F FECB                <1> 	dec	bl
  5438 00002D91 7509                <1> 	jnz	short l_gfx_8_14c_2
  5439                              <1> 	; bl = 1
  5440 00002D93 C605[EAFB0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5441 00002D9A EB16                <1> 	jmp	short l_gfx_8_14c_4 	
  5442                              <1> l_gfx_8_14c_2:
  5443 00002D9C FECB                <1> 	dec	bl
  5444 00002D9E 740B                <1> 	jz	short l_gfx_8_14c_3 ; bl = 2
  5445 00002DA0 FECB                <1> 	dec	bl
  5446 00002DA2 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 00002DA4 C605[EAFB0000]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 00002DAB C605[EAFB0000]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 00002DB2 C605[E6FB0000]0E    <1>         mov     byte [CHAR_HEIGHT], 14
  5463                              <1> 	; }
  5464 00002DB9 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 00002DBA C705[56410100]-     <1> 	mov	dword [VGA_INT43H], vgafont8
  5480 00002DC0 [24080100]          <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 00002DC4 20DB                <1> 	and	bl, bl
  5493 00002DC6 7508                <1> 	jnz	short l_gfx_8_8c_1
  5494 00002DC8 8815[EAFB0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5495 00002DCE 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 00002DD0 FECB                <1> 	dec	bl
  5501 00002DD2 7509                <1> 	jnz	short l_gfx_8_8c_2
  5502                              <1> 	; bl = 1
  5503 00002DD4 C605[EAFB0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5504 00002DDB EB16                <1> 	jmp	short l_gfx_8_8c_4 	
  5505                              <1> l_gfx_8_8c_2:
  5506 00002DDD FECB                <1> 	dec	bl
  5507 00002DDF 740B                <1> 	jz	short l_gfx_8_8c_3 ; bl = 2
  5508 00002DE1 FECB                <1> 	dec	bl
  5509 00002DE3 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 00002DE5 C605[EAFB0000]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 00002DEC C605[EAFB0000]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 00002DF3 C605[E6FB0000]08    <1>         mov     byte [CHAR_HEIGHT], 8
  5526                              <1> 	; }
  5527 00002DFA 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 00002DFB C705[56410100]-     <1> 	mov	dword [VGA_INT43H], vgafont16
  5543 00002E01 [241E0100]          <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 00002E05 20DB                <1> 	and	bl, bl
  5556 00002E07 7508                <1> 	jnz	short l_gfx_8_16c_1
  5557 00002E09 8815[EAFB0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5558 00002E0F 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 00002E11 FECB                <1> 	dec	bl
  5564 00002E13 7509                <1> 	jnz	short l_gfx_8_16c_2
  5565                              <1> 	; bl = 1
  5566 00002E15 C605[EAFB0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5567 00002E1C EB16                <1> 	jmp	short l_gfx_8_16c_4 	
  5568                              <1> l_gfx_8_16c_2:
  5569 00002E1E FECB                <1> 	dec	bl
  5570 00002E20 740B                <1> 	jz	short l_gfx_8_16c_3 ; bl = 2
  5571 00002E22 FECB                <1> 	dec	bl
  5572 00002E24 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 00002E26 C605[EAFB0000]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 00002E2D C605[EAFB0000]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 00002E34 C605[E6FB0000]10    <1>         mov     byte [CHAR_HEIGHT], 16
  5589                              <1> 	; }
  5590 00002E3B 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 00002E3C 20DB                <1> 	and	bl, bl
  5634 00002E3E 7408                <1> 	jz	short gfi_0
  5635                              <1> 	; invalid function (input)
  5636 00002E40 80FB03              <1> 	cmp	bl, 3
  5637 00002E43 7642                <1> 	jna	short gfi_4
  5638 00002E45 31C0                <1> 	xor	eax, eax ; 0
  5639 00002E47 C3                  <1> 	retn
  5640                              <1> gfi_0:
  5641 00002E48 A0[E6FB0000]        <1> 	mov	al, [CHAR_HEIGHT]
  5642 00002E4D 8A25[EAFB0000]      <1> 	mov	ah, [VGA_ROWS]
  5643 00002E53 C1E010              <1> 	shl	eax, 16
  5644 00002E56 A0[E4FB0000]        <1> 	mov	al, [CRT_COLS]
  5645 00002E5B 8B0D[56410100]      <1> 	mov	ecx, [VGA_INT43H]
  5646 00002E61 21C9                <1> 	and	ecx, ecx
  5647 00002E63 741E                <1> 	jz	short gfi_2 ; 0 = default font
  5648 00002E65 41                  <1> 	inc	ecx ; 0FFFFFFFFh -> 0 (user defined font)
  5649 00002E66 7504                <1> 	jnz	short gfi_1
  5650 00002E68 FECC                <1> 	dec	ah ; 0FFh
  5651 00002E6A EB17                <1> 	jmp	short gfi_2
  5652                              <1> gfi_1:
  5653 00002E6C 49                  <1> 	dec	ecx ; 08/08/2016
  5654 00002E6D B40E                <1> 	mov	ah, 14
  5655 00002E6F 81F9[24100100]      <1> 	cmp	ecx, vgafont14
  5656 00002E75 740C                <1> 	je	short gfi_2
  5657 00002E77 B408                <1> 	mov	ah, 8
  5658 00002E79 81F9[24080100]      <1> 	cmp	ecx, vgafont8
  5659 00002E7F 7402                <1> 	je	short gfi_2
  5660                              <1> 	; vgafont16
  5661 00002E81 D0E4                <1> 	shl	ah, 1 ; ah = 16
  5662                              <1> gfi_2:
  5663 00002E83 C1C010              <1> 	rol	eax, 16
  5664                              <1> gfi_3:
  5665 00002E86 C3                  <1> 	retn
  5666                              <1> gfi_4:
  5667 00002E87 89D7                <1> 	mov	edi, edx ; **
  5668 00002E89 80FB02              <1> 	cmp	bl, 2
  5669 00002E8C 720B                <1> 	jb	short gfi_5
  5670 00002E8E 772F                <1> 	ja	short gfi_7
  5671                              <1> 	;BL = 2 -> vgafont14
  5672 00002E90 BE[24100100]        <1> 	mov	esi, vgafont14 ; *
  5673 00002E95 B30E                <1> 	mov	bl, 14
  5674 00002E97 EB07                <1> 	jmp	short gfi_6 
  5675                              <1> gfi_5:
  5676                              <1> 	;BL = 1 -> vgafont8
  5677 00002E99 BE[24080100]        <1> 	mov	esi, vgafont8 ; *
  5678 00002E9E B308                <1> 	mov	bl, 8
  5679                              <1> gfi_6:
  5680 00002EA0 09C9                <1> 	or	ecx, ecx
  5681 00002EA2 7424                <1> 	jz	short gfi_8 ; all chars from the 00h
  5682 00002EA4 88F8                <1> 	mov	al, bh ; character index
  5683 00002EA6 F6E3                <1> 	mul	bl ; char index * char height/size
  5684 00002EA8 0FB7D0              <1> 	movzx	edx, ax
  5685 00002EAB 01D6                <1> 	add	esi, edx ; *
  5686 00002EAD 66BAFF00            <1> 	mov	dx, 255
  5687 00002EB1 28FA                <1> 	sub	dl, bh
  5688 00002EB3 6642                <1> 	inc	dx	
  5689 00002EB5 39D1                <1> 	cmp	ecx, edx
  5690 00002EB7 770F                <1> 	ja	short gfi_8
  5691 00002EB9 7412                <1> 	je	short gfi_9
  5692 00002EBB 89D1                <1> 	mov	ecx, edx
  5693 00002EBD EB0E                <1> 	jmp	short gfi_9
  5694                              <1> gfi_7:
  5695                              <1> 	;BL = 3 -> vgafont16
  5696 00002EBF BE[241E0100]        <1> 	mov	esi, vgafont16 ; *
  5697 00002EC4 B310                <1> 	mov	bl, 16
  5698 00002EC6 EBD8                <1> 	jmp	short gfi_6
  5699                              <1> gfi_8:
  5700 00002EC8 B900010000          <1> 	mov	ecx, 256
  5701                              <1> gfi_9:
  5702 00002ECD 6689C8              <1> 	mov	ax, cx ; character count
  5703 00002ED0 30FF                <1> 	xor	bh, bh
  5704 00002ED2 66F7E3              <1> 	mul	bx ; char count * char height/size	
  5705 00002ED5 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 00002ED8 E8C3B10000          <1> 	call	transfer_to_user_buffer
  5711 00002EDD 89C8                <1> 	mov	eax, ecx ; actual transfer count
  5712 00002EDF 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 00002EE0 3C00                <1> 	cmp	al, 0
  5724 00002EE2 0F848F000000        <1>         je      set_single_palette_reg
  5725                              <1> vga_palf_1001:
  5726 00002EE8 3C01                <1> 	cmp	al, 1
  5727 00002EEA 0F84B4000000        <1>         je      set_overscan_border_color
  5728                              <1> vga_palf_1002:
  5729 00002EF0 3C02                <1> 	cmp	al, 2
  5730 00002EF2 0F84B0000000        <1>         je      set_all_palette_reg
  5731                              <1> vga_palf_1003:
  5732 00002EF8 3C03                <1> 	cmp	al, 3
  5733 00002EFA 0F84E8000000        <1>         je      toggle_intensity
  5734                              <1> vga_palf_1007:
  5735 00002F00 3C07                <1> 	cmp	al, 7
  5736 00002F02 0F840D010000        <1>         je      get_single_palette_reg
  5737 00002F08 7266                <1> 	jb	short vga_palf_unknown
  5738                              <1> vga_palf_1008:
  5739 00002F0A 3C08                <1> 	cmp	al, 8
  5740 00002F0C 0F8437010000        <1>         je      read_overscan_border_color
  5741                              <1> vga_palf_1009:
  5742 00002F12 3C09                <1> 	cmp	al, 9
  5743 00002F14 0F8433010000        <1> 	je	get_all_palette_reg
  5744                              <1> vga_palf_1010:
  5745 00002F1A 3C10                <1> 	cmp	al, 10h
  5746 00002F1C 0F8487010000        <1> 	je 	set_single_dac_reg
  5747 00002F22 724C                <1> 	jb	short vga_palf_unknown
  5748                              <1> vga_palf_1012:
  5749 00002F24 3C12                <1> 	cmp	al, 12h
  5750 00002F26 0F8498010000        <1>         je      set_all_dac_reg
  5751 00002F2C 7242                <1> 	jb	short vga_palf_unknown
  5752                              <1> vga_palf_1013:
  5753 00002F2E 3C13                <1> 	cmp	al, 13h
  5754 00002F30 0F84CC010000        <1>         je      select_video_dac_color_page
  5755                              <1> vga_palf_1015:
  5756 00002F36 3C15                <1> 	cmp	al, 15h
  5757 00002F38 0F8412020000        <1> 	je	read_single_dac_reg
  5758 00002F3E 7230                <1> 	jb	short vga_palf_unknown
  5759                              <1> vga_palf_1017:
  5760 00002F40 3C17                <1> 	cmp	al, 17h
  5761 00002F42 0F8428020000        <1>         je      read_all_dac_reg
  5762 00002F48 7226                <1> 	jb	short vga_palf_unknown
  5763                              <1> vga_palf_1018:
  5764 00002F4A 3C18                <1> 	cmp	al, 18h
  5765 00002F4C 0F845E020000        <1>         je      set_pel_mask
  5766                              <1> vga_palf_1019:
  5767 00002F52 3C19                <1> 	cmp	al, 19h
  5768 00002F54 0F8462020000        <1>         je      read_pel_mask
  5769                              <1> vga_palf_101A:
  5770 00002F5A 3C1A                <1> 	cmp	al, 1Ah
  5771 00002F5C 0F8468020000        <1>         je      read_video_dac_state
  5772                              <1> vga_palf_101B:
  5773 00002F62 3C1B                <1> 	cmp	al, 1Bh
  5774                              <1> 	;jne	short vga_palf_unknown
  5775 00002F64 770A                <1> 	ja	short vga_palf_unknown
  5776                              <1>  
  5777 00002F66 E80CF7FFFF          <1> 	call	gray_scale_summing
  5778 00002F6B E9D5E5FFFF          <1>         jmp     VIDEO_RETURN 	
  5779                              <1> 
  5780                              <1> vga_palf_unknown:
  5781 00002F70 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  5782 00002F72 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 00002F77 80FB14              <1> 	cmp	bl, 14h
  5793                              <1> 	;ja	short no_actl_reg1
  5794 00002F7A 0F87C5E5FFFF        <1> 	ja	VIDEO_RETURN
  5795 00002F80 6650                <1> 	push	ax
  5796 00002F82 6652                <1> 	push	dx
  5797 00002F84 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5798 00002F88 EC                  <1> 	in	al, dx
  5799 00002F89 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5800 00002F8D 88D8                <1> 	mov	al, bl
  5801 00002F8F EE                  <1> 	out	dx, al
  5802 00002F90 88F8                <1> 	mov	al, bh
  5803 00002F92 EE                  <1> 	out	dx, al
  5804 00002F93 B020                <1> 	mov	al, 20h
  5805 00002F95 EE                  <1> 	out	dx, al
  5806                              <1> 	; ifdef VBOX
  5807 00002F96 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5808 00002F9A EC                  <1> 	in	al, dx
  5809                              <1> 	; endif ; VBOX
  5810 00002F9B 665A                <1> 	pop	dx
  5811 00002F9D 6658                <1> 	pop	ax
  5812                              <1> ;no_actl_reg1:
  5813 00002F9F 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 00002FA4 B311                <1> 	mov	bl, 11h
  5822 00002FA6 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 00002FA8 89D6                <1> 	mov	esi, edx ; user buffer
  5832 00002FAA B911000000          <1> 	mov	ecx, 17
  5833 00002FAF 89E7                <1> 	mov	edi, esp
  5834 00002FB1 83EC14              <1> 	sub	esp, 20	 	 
  5835 00002FB4 E831B10000          <1> 	call	transfer_from_user_buffer
  5836                              <1> 	;jc	VIDEO_RETURN
  5837                              <1> 
  5838 00002FB9 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5839 00002FBD EC                  <1> 	in	al, dx
  5840 00002FBE B100                <1> 	mov	cl, 0
  5841 00002FC0 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5842                              <1> set_palette_loop:
  5843 00002FC4 88C8                <1> 	mov	al, cl
  5844 00002FC6 EE                  <1> 	out	dx, al
  5845 00002FC7 8A07                <1> 	mov	al, [edi]
  5846 00002FC9 EE                  <1> 	out	dx, al
  5847 00002FCA 47                  <1> 	inc	edi
  5848 00002FCB FEC1                <1> 	inc	cl
  5849 00002FCD 80F910              <1> 	cmp	cl, 10h
  5850 00002FD0 75F2                <1> 	jne	short set_palette_loop
  5851 00002FD2 B011                <1> 	mov	al, 11h
  5852 00002FD4 EE                  <1> 	out	dx, al
  5853 00002FD5 8A07                <1> 	mov	al, [edi]
  5854 00002FD7 EE                  <1> 	out	dx, al
  5855 00002FD8 B020                <1> 	mov	al, 20h
  5856 00002FDA EE                  <1> 	out	dx, al
  5857                              <1> 	; ifdef VBOX
  5858 00002FDB 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5859 00002FDF EC                  <1> 	in	al, dx
  5860                              <1> 	; endif ; VBOX
  5861 00002FE0 83C414              <1> 	add	esp, 20
  5862 00002FE3 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 00002FE8 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5873 00002FEC EC                  <1> 	in	al, dx
  5874 00002FED 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5875 00002FF1 B010                <1> 	mov	al, 10h
  5876 00002FF3 EE                  <1> 	out	dx, al
  5877 00002FF4 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5878 00002FF8 EC                  <1> 	in	al, dx
  5879 00002FF9 24F7                <1> 	and	al, 0F7h
  5880 00002FFB 80E301              <1> 	and	bl, 01h
  5881 00002FFE C0E303              <1> 	shl	bl, 3
  5882 00003001 08D8                <1> 	or	al, bl
  5883 00003003 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5884 00003007 EE                  <1> 	out	dx, al
  5885 00003008 B020                <1> 	mov	al, 20h
  5886 0000300A EE                  <1> 	out	dx, al
  5887                              <1> 	; ifdef VBOX
  5888 0000300B 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5889 0000300F EC                  <1> 	in	al, dx
  5890                              <1> 	; endif ; VBOX
  5891 00003010 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 00003015 80FB14              <1> 	cmp	bl, 14h
  5903                              <1> 	;ja	short no_actl_reg2
  5904 00003018 0F8727E5FFFF        <1> 	ja	VIDEO_RETURN
  5905                              <1> 
  5906 0000301E 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5907 00003022 EC                  <1> 	in	al, dx
  5908 00003023 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5909 00003027 88D8                <1> 	mov	al, bl
  5910 00003029 EE                  <1> 	out	dx, al
  5911 0000302A 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5912 0000302E EC                  <1> 	in	al, dx
  5913 0000302F 8844240D            <1> 	mov	[esp+13], al ; bh
  5914 00003033 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5915 00003037 EC                  <1> 	in	al, dx
  5916 00003038 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5917 0000303C B020                <1> 	mov	al, 20h
  5918 0000303E EE                  <1> 	out	dx, al
  5919                              <1> 	; ifdef VBOX
  5920 0000303F 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5921 00003043 EC                  <1> 	in	al, dx
  5922                              <1> 	; endif ; VBOX
  5923 00003044 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 00003049 B311                <1> 	mov	bl, 11h
  5933 0000304B 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 0000304D 89D7                <1> 	mov	edi, edx
  5942 0000304F 89E3                <1> 	mov	ebx, esp
  5943 00003051 89DE                <1> 	mov	esi, ebx
  5944 00003053 83EC14              <1> 	sub	esp, 20	 
  5945                              <1> 
  5946 00003056 B100                <1> 	mov	cl, 0
  5947                              <1> get_palette_loop:
  5948 00003058 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5949 0000305C EC                  <1> 	in	al, dx
  5950 0000305D 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5951 00003061 88C8                <1> 	mov	al, cl
  5952 00003063 EE                  <1> 	out	dx, al
  5953 00003064 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5954 00003068 EC                  <1> 	in	al, dx
  5955 00003069 8803                <1> 	mov	[ebx], al
  5956 0000306B 43                  <1> 	inc	ebx
  5957 0000306C FEC1                <1> 	inc	cl
  5958 0000306E 80F910              <1> 	cmp	cl, 10h
  5959 00003071 75E5                <1> 	jne	short get_palette_loop
  5960 00003073 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5961 00003077 EC                  <1> 	in	al, dx
  5962 00003078 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5963 0000307C B011                <1> 	mov	al, 11h
  5964 0000307E EE                  <1> 	out	dx, al
  5965 0000307F 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5966 00003083 EC                  <1> 	in	al, dx
  5967 00003084 8803                <1> 	mov	[ebx], al
  5968 00003086 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5969 0000308A EC                  <1> 	in	al, dx
  5970 0000308B 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5971 0000308F B020                <1> 	mov	al, 20h
  5972 00003091 EE                  <1> 	out	dx, al
  5973                              <1> 	; ifdef VBOX
  5974 00003092 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5975 00003096 EC                  <1> 	in	al, dx
  5976                              <1> 	; endif ; VBOX
  5977                              <1> 
  5978 00003097 B911000000          <1> 	mov	ecx, 17 ; transfer (byte) count
  5979                              <1> 	; ESI = source address in system space
  5980                              <1> 	; EDI = user's buffer address
  5981 0000309C E8FFAF0000          <1> 	call	transfer_to_user_buffer
  5982                              <1> 
  5983 000030A1 83C414              <1> 	add	esp, 20
  5984 000030A4 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 000030A9 6652                <1> 	push	dx
  5995 000030AB 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  5996 000030AF 88D8                <1> 	mov	al, bl
  5997 000030B1 EE                  <1> 	out	dx, al
  5998                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  5999 000030B2 6642                <1> 	inc	dx
  6000 000030B4 6658                <1> 	pop	ax
  6001 000030B6 88E0                <1> 	mov	al, ah
  6002 000030B8 EE                  <1> 	out	dx, al
  6003 000030B9 88E8                <1> 	mov	al, ch
  6004 000030BB EE                  <1> 	out	dx, al
  6005 000030BC 88C8                <1> 	mov	al, cl
  6006 000030BE EE                  <1> 	out	dx, al
  6007 000030BF 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 000030C4 89D6                <1> 	mov	esi, edx ; user buffer
  6020 000030C6 89CA                <1> 	mov	edx, ecx
  6021 000030C8 66D1E1              <1> 	shl	cx, 1 ; *2
  6022 000030CB 01D1                <1> 	add	ecx, edx ; ecx = 3*ecx
  6023 000030CD 89E5                <1> 	mov	ebp, esp
  6024 000030CF 89EF                <1> 	mov	edi, ebp
  6025 000030D1 29CF                <1> 	sub	edi, ecx
  6026 000030D3 6683E7FC            <1> 	and	di, 0FFFCh ; (dword alignment)
  6027 000030D7 89FC                <1> 	mov	esp, edi
  6028 000030D9 E80CB00000          <1> 	call	transfer_from_user_buffer
  6029                              <1> 	;jc	VIDEO_RETURN
  6030                              <1> 
  6031 000030DE 89D1                <1> 	mov	ecx, edx
  6032 000030E0 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  6033 000030E4 88D8                <1> 	mov	al, bl
  6034 000030E6 EE                  <1> 	out	dx, al
  6035 000030E7 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6036                              <1> set_dac_loop:
  6037 000030EB 8A07                <1> 	mov	al, [edi]
  6038 000030ED EE                  <1> 	out	dx, al
  6039 000030EE 47                  <1> 	inc	edi
  6040 000030EF 8A07                <1> 	mov	al, [edi]
  6041 000030F1 EE                  <1> 	out	dx, al
  6042 000030F2 47                  <1> 	inc	edi
  6043 000030F3 8A07                <1> 	mov	al, [edi]
  6044 000030F5 EE                  <1> 	out	dx, al
  6045 000030F6 47                  <1> 	inc	edi
  6046 000030F7 6649                <1> 	dec	cx
  6047 000030F9 75F0                <1> 	jnz	short set_dac_loop
  6048 000030FB 89EC                <1> 	mov	esp, ebp
  6049 000030FD 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 00003102 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6064 00003106 EC                  <1> 	in	al, dx
  6065 00003107 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6066 0000310B B010                <1> 	mov	al, 10h
  6067 0000310D EE                  <1> 	out	dx, al
  6068 0000310E 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6069 00003112 EC                  <1> 	in	al, dx
  6070 00003113 80E301              <1> 	and	bl, 01h
  6071 00003116 750E                <1> 	jnz	short set_dac_page
  6072 00003118 247F                <1> 	and	al, 07Fh
  6073 0000311A C0E707              <1> 	shl	bh, 7
  6074 0000311D 08F8                <1> 	or	al, bh
  6075 0000311F 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6076 00003123 EE                  <1> 	out	dx, al
  6077 00003124 EB1D                <1> 	jmp	short set_actl_normal
  6078                              <1> set_dac_page:
  6079 00003126 6650                <1> 	push	ax
  6080 00003128 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6081 0000312C EC                  <1> 	in	al, dx
  6082 0000312D 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6083 00003131 B014                <1> 	mov	al, 14h
  6084 00003133 EE                  <1> 	out	dx, al
  6085 00003134 6658                <1> 	pop	ax
  6086 00003136 2480                <1> 	and	al, 80h
  6087 00003138 7503                <1> 	jnz	short set_dac_16_page
  6088 0000313A C0E702              <1> 	shl	bh, 2
  6089                              <1> set_dac_16_page:
  6090 0000313D 80E70F              <1> 	and	bh, 0Fh
  6091 00003140 88F8                <1> 	mov	al, bh
  6092 00003142 EE                  <1> 	out	dx, al
  6093                              <1> set_actl_normal:
  6094 00003143 B020                <1> 	mov	al, 20h
  6095 00003145 EE                  <1> 	out	dx, al
  6096                              <1> 	; ifdef VBOX
  6097 00003146 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6098 0000314A EC                  <1> 	in	al, dx
  6099                              <1> 	; endif ; VBOX
  6100 0000314B 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 00003150 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  6113 00003154 88D8                <1> 	mov	al, bl
  6114 00003156 EE                  <1> 	out	dx, al
  6115 00003157 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6116 0000315B EC                  <1> 	in	al, dx
  6117 0000315C 88442415            <1> 	mov	[esp+21], al ; dh
  6118 00003160 EC                  <1> 	in	al, dx
  6119 00003161 88C5                <1> 	mov	ch, al
  6120 00003163 EC                  <1> 	in	al, dx
  6121 00003164 88C1                <1> 	mov	cl, al
  6122 00003166 66894C2410          <1> 	mov	[esp+16], cx ; cx
  6123 0000316B 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 00003170 89D7                <1> 	mov	edi, edx ; user buffer
  6136 00003172 89CA                <1> 	mov	edx, ecx
  6137 00003174 66D1E2              <1> 	shl	dx, 1 ; *2
  6138 00003177 01CA                <1> 	add	edx, ecx ; edx = 3*ecx
  6139 00003179 89E5                <1> 	mov	ebp, esp
  6140 0000317B 89EE                <1> 	mov	esi, ebp
  6141 0000317D 29D6                <1> 	sub	esi, edx
  6142 0000317F 6683E6FC            <1> 	and	si, 0FFFCh ; (dword alignment)
  6143 00003183 89F4                <1> 	mov	esp, esi
  6144 00003185 52                  <1> 	push	edx ; 3*ecx
  6145 00003186 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  6146 0000318A 88D8                <1> 	mov	al, bl
  6147 0000318C EE                  <1> 	out	dx, al
  6148 0000318D 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6149 00003191 89F3                <1> 	mov	ebx, esi
  6150                              <1> read_dac_loop:
  6151 00003193 EC                  <1> 	in	al, dx
  6152 00003194 8803                <1> 	mov	[ebx], al
  6153 00003196 43                  <1> 	inc	ebx
  6154 00003197 EC                  <1> 	in	al, dx
  6155 00003198 8803                <1> 	mov	[ebx], al
  6156 0000319A 43                  <1> 	inc	ebx
  6157 0000319B EC                  <1> 	in	al, dx
  6158 0000319C 8803                <1> 	mov	[ebx], al
  6159 0000319E 43                  <1> 	inc	ebx
  6160 0000319F 6649                <1> 	dec	cx
  6161 000031A1 75F0                <1> 	jnz	short read_dac_loop
  6162 000031A3 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 000031A4 E8F7AE0000          <1> 	call	transfer_to_user_buffer
  6167 000031A9 89EC                <1> 	mov	esp, ebp
  6168 000031AB E995E3FFFF          <1> 	jmp	VIDEO_RETURN
  6169                              <1> 
  6170                              <1> set_pel_mask:
  6171                              <1> 	; 10/08/2016
  6172                              <1> 	; BL = mask value
  6173 000031B0 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  6174 000031B4 88D8                <1> 	mov	al, bl
  6175 000031B6 EE                  <1> 	out	dx, al
  6176 000031B7 E989E3FFFF          <1> 	jmp	VIDEO_RETURN
  6177                              <1> 
  6178                              <1> read_pel_mask:
  6179                              <1> 	; 10/08/2016
  6180                              <1> 	; Output: BL = mask value 
  6181 000031BC 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  6182 000031C0 EC                  <1> 	in	al, dx
  6183 000031C1 8844240C            <1> 	mov	[esp+12], al ; bl
  6184 000031C5 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 000031CA 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6194 000031CE EC                  <1> 	in	al, dx
  6195 000031CF 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6196 000031D3 B010                <1> 	mov	al, 10h
  6197 000031D5 EE                  <1> 	out	dx, al
  6198 000031D6 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6199 000031DA EC                  <1> 	in	al, dx
  6200 000031DB 88C3                <1> 	mov	bl, al
  6201 000031DD C0EB07              <1> 	shr	bl, 7
  6202 000031E0 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6203 000031E4 EC                  <1> 	in	al, dx
  6204 000031E5 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6205 000031E9 B014                <1> 	mov	al, 14h
  6206 000031EB EE                  <1> 	out	dx, al
  6207 000031EC 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6208 000031F0 EC                  <1> 	in	al, dx
  6209 000031F1 88C7                <1> 	mov	bh, al
  6210 000031F3 80E70F              <1> 	and	bh, 0Fh
  6211 000031F6 F6C301              <1> 	test	bl, 01
  6212 000031F9 7503                <1> 	jnz	short get_dac_16_page
  6213 000031FB C0EF02              <1> 	shr	bh, 2
  6214                              <1> get_dac_16_page:
  6215 000031FE 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6216 00003202 EC                  <1> 	in	al, dx
  6217 00003203 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6218 00003207 B020                <1> 	mov	al, 20h
  6219 00003209 EE                  <1> 	out	dx, al
  6220                              <1> 	; ifdef VBOX
  6221 0000320A 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6222 0000320E EC                  <1> 	in	al, dx
  6223                              <1> 	; endif ; VBOX 
  6224 0000320F 66895C240C          <1> 	mov	[esp+12], bx ; bx
  6225 00003214 E92CE3FFFF          <1> 	jmp	VIDEO_RETURN
  6226                              <1> 
  6227                              <1> ; % include 'vidata.s' ; VIDEO DATA
  6228                              <1> 
  6229                              <1> ; /// End Of VIDEO FUNCTIONS ///
  1933                                  
  1934                                  setup_rtc_int:
  1935                                  ; source: http://wiki.osdev.org/RTC
  1936 00003219 FA                      	cli		; disable interrupts
  1937                                  	; default int frequency is 1024 Hz (Lower 4 bits of register A is 0110b or 6)
  1938                                  	; in order to change this ...
  1939                                  	; frequency  = 32768 >> (rate-1) --> 32768 >> 5 = 1024
  1940                                  	; (rate must be above 2 and not over 15)
  1941                                  	; new rate = 15 --> 32768 >> (15-1) = 2 Hz
  1942 0000321A B08A                    	mov	al, 8Ah 
  1943 0000321C E670                    	out	70h, al ; set index to register A, disable NMI
  1944 0000321E 90                      	nop
  1945 0000321F E471                    	in	al, 71h ; get initial value of register A
  1946 00003221 88C4                    	mov 	ah, al
  1947 00003223 80E4F0                  	and	ah, 0F0h
  1948 00003226 B08A                    	mov	al, 8Ah 
  1949 00003228 E670                    	out	70h, al ; reset index to register A
  1950 0000322A 88E0                    	mov	al, ah
  1951 0000322C 0C0F                    	or	al, 0Fh	; new rate (0Fh -> 15)
  1952 0000322E E671                    	out	71h, al ; write only our rate to A. Note, rate is the bottom 4 bits. 
  1953                                  	; enable RTC interrupt
  1954 00003230 B08B                    	mov	al, 8Bh ;
  1955 00003232 E670                    	out	70h, al ; select register B and disable NMI
  1956 00003234 90                      	nop
  1957 00003235 E471                    	in	al, 71h ; read the current value of register B
  1958 00003237 88C4                    	mov	ah, al  ;
  1959 00003239 B08B                    	mov 	al, 8Bh ;
  1960 0000323B E670                    	out	70h, al ; set the index again (a read will reset the index to register B)	
  1961 0000323D 88E0                    	mov	al, ah  ;
  1962 0000323F 0C40                    	or	al, 40h ;
  1963 00003241 E671                    	out	71h, al ; write the previous value ORed with 0x40. This turns on bit 6 of register B
  1964 00003243 FB                      	sti
  1965 00003244 C3                      	retn
  1966                                  
  1967                                  ; Write memory information
  1968                                  ; 29/01/2016
  1969                                  ; 06/11/2014
  1970                                  ; 14/08/2015 
  1971                                  memory_info:	
  1972 00003245 A1[AC330100]            	mov	eax, [memory_size] ; in pages
  1973 0000324A 50                      	push	eax
  1974 0000324B C1E00C                  	shl	eax, 12		   ; in bytes
  1975 0000324E BB0A000000              	mov	ebx, 10
  1976 00003253 89D9                    	mov	ecx, ebx	   ; 10
  1977 00003255 BE[F1010100]            	mov	esi, mem_total_b_str	
  1978 0000325A E8BD000000              	call	bintdstr
  1979 0000325F 58                      	pop	eax
  1980 00003260 B107                    	mov	cl, 7
  1981 00003262 BE[15020100]            	mov	esi, mem_total_p_str
  1982 00003267 E8B0000000              	call	bintdstr	
  1983                                  	; 14/08/2015
  1984 0000326C E8C8000000              	call	calc_free_mem
  1985                                  	; edx = calculated free pages
  1986                                  	; ecx = 0
  1987 00003271 A1[B0330100]            	mov 	eax, [free_pages]
  1988 00003276 39D0                    	cmp	eax, edx ; calculated free mem value 
  1989                                  		; and initial free mem value are same or not?
  1990 00003278 751D                    	jne 	short pmim ; print mem info with '?' if not
  1991 0000327A 52                      	push 	edx ; free memory in pages	
  1992                                  	;mov 	eax, edx
  1993 0000327B C1E00C                  	shl	eax, 12 ; convert page count
  1994                                  			; to byte count
  1995 0000327E B10A                    	mov	cl, 10
  1996 00003280 BE[35020100]            	mov	esi, free_mem_b_str
  1997 00003285 E892000000              	call	bintdstr
  1998 0000328A 58                      	pop	eax
  1999 0000328B B107                    	mov	cl, 7
  2000 0000328D BE[59020100]            	mov	esi, free_mem_p_str
  2001 00003292 E885000000              	call	bintdstr
  2002                                  pmim:
  2003 00003297 BE[DF010100]            	mov	esi, msg_memory_info
  2004                                  	;
  2005 0000329C B407                    	mov	ah, 07h ; Black background, 
  2006                                  			; light gray forecolor
  2007                                  print_kmsg: ; 29/01/2016
  2008 0000329E 8825[D7330100]          	mov	[ccolor], ah
  2009                                  pkmsg_loop:
  2010 000032A4 AC                      	lodsb
  2011 000032A5 08C0                    	or	al, al
  2012 000032A7 7410                    	jz	short pkmsg_ok
  2013 000032A9 56                      	push	esi
  2014                                  	; 13/05/2016
  2015 000032AA 0FB61D[D7330100]        	movzx	ebx, byte [ccolor]
  2016                                  			; Video page 0 (bh=0)
  2017 000032B1 E8EDE9FFFF              	call	_write_tty
  2018 000032B6 5E                      	pop	esi
  2019 000032B7 EBEB                    	jmp	short pkmsg_loop
  2020                                  pkmsg_ok:
  2021 000032B9 C3                      	retn
  2022                                  
  2023                                  ; Convert binary number to hexadecimal string
  2024                                  ; 10/05/2015  
  2025                                  ; dsectpm.s (28/02/2015)
  2026                                  ; Retro UNIX 386 v1 - Kernel v0.2.0.6  
  2027                                  ; 01/12/2014
  2028                                  ; 25/11/2014
  2029                                  ;
  2030                                  bytetohex:
  2031                                  	; INPUT ->
  2032                                  	; 	AL = byte (binary number)
  2033                                  	; OUTPUT ->
  2034                                  	;	AX = hexadecimal string
  2035                                  	;
  2036 000032BA 53                      	push	ebx
  2037 000032BB 31DB                    	xor	ebx, ebx
  2038 000032BD 88C3                    	mov	bl, al
  2039 000032BF C0EB04                  	shr	bl, 4
  2040 000032C2 8A9B[0C330000]          	mov	bl, [ebx+hexchrs] 	 	
  2041 000032C8 86D8                    	xchg	bl, al
  2042 000032CA 80E30F                  	and	bl, 0Fh
  2043 000032CD 8AA3[0C330000]          	mov	ah, [ebx+hexchrs] 
  2044 000032D3 5B                      	pop	ebx	
  2045 000032D4 C3                      	retn
  2046                                  
  2047                                  wordtohex:
  2048                                  	; INPUT ->
  2049                                  	; 	AX = word (binary number)
  2050                                  	; OUTPUT ->
  2051                                  	;	EAX = hexadecimal string
  2052                                  	;
  2053 000032D5 53                      	push	ebx
  2054 000032D6 31DB                    	xor	ebx, ebx
  2055 000032D8 86E0                    	xchg	ah, al
  2056 000032DA 6650                    	push	ax
  2057 000032DC 88E3                    	mov	bl, ah
  2058 000032DE C0EB04                  	shr	bl, 4
  2059 000032E1 8A83[0C330000]          	mov	al, [ebx+hexchrs] 	 	
  2060 000032E7 88E3                    	mov	bl, ah
  2061 000032E9 80E30F                  	and	bl, 0Fh
  2062 000032EC 8AA3[0C330000]          	mov	ah, [ebx+hexchrs]
  2063 000032F2 C1E010                  	shl	eax, 16
  2064 000032F5 6658                    	pop	ax
  2065 000032F7 5B                      	pop	ebx
  2066 000032F8 EBC0                    	jmp	short bytetohex
  2067                                  	;mov	bl, al
  2068                                  	;shr	bl, 4
  2069                                  	;mov	bl, [ebx+hexchrs] 	 	
  2070                                  	;xchg	bl, al	 	
  2071                                  	;and	bl, 0Fh
  2072                                  	;mov	ah, [ebx+hexchrs] 
  2073                                  	;pop	ebx	
  2074                                  	;retn
  2075                                  
  2076                                  dwordtohex:
  2077                                  	; INPUT ->
  2078                                  	; 	EAX = dword (binary number)
  2079                                  	; OUTPUT ->
  2080                                  	;	EDX:EAX = hexadecimal string
  2081                                  	;
  2082 000032FA 50                      	push	eax
  2083 000032FB C1E810                  	shr	eax, 16
  2084 000032FE E8D2FFFFFF              	call	wordtohex
  2085 00003303 89C2                    	mov	edx, eax
  2086 00003305 58                      	pop	eax
  2087 00003306 E8CAFFFFFF              	call	wordtohex
  2088 0000330B C3                      	retn
  2089                                  
  2090                                  ; 10/05/2015
  2091                                  hex_digits:
  2092                                  hexchrs:
  2093 0000330C 303132333435363738-     	db '0123456789ABCDEF'
  2093 00003315 39414243444546     
  2094                                  
  2095                                  ; Convert binary number to decimal/numeric string
  2096                                  ; 06/11/2014
  2097                                  ; Temporary Code
  2098                                  ;
  2099                                  
  2100                                  bintdstr:
  2101                                  	; EAX = binary number
  2102                                  	; ESI = decimal/numeric string address
  2103                                  	; EBX = divisor (10)
  2104                                  	; ECX = string length (<=10)
  2105 0000331C 01CE                    	add	esi, ecx
  2106                                  btdstr0:
  2107 0000331E 4E                      	dec	esi
  2108 0000331F 31D2                    	xor	edx, edx
  2109 00003321 F7F3                    	div	ebx
  2110 00003323 80C230                  	add	dl, 30h
  2111 00003326 8816                    	mov	[esi], dl
  2112 00003328 FEC9                    	dec	cl
  2113 0000332A 740C                    	jz	short btdstr2 ; 08/09/2016
  2114 0000332C 09C0                    	or	eax, eax
  2115 0000332E 75EE                    	jnz	short btdstr0
  2116                                  btdstr1:
  2117 00003330 4E                      	dec	esi
  2118 00003331 C60620                          mov     byte [esi], 20h ; blank space
  2119 00003334 FEC9                    	dec	cl
  2120 00003336 75F8                    	jnz	short btdstr1
  2121                                  btdstr2:
  2122 00003338 C3                      	retn
  2123                                  
  2124                                  ; Calculate free memory pages on M.A.T.
  2125                                  ; 06/11/2014
  2126                                  ; Temporary Code
  2127                                  ;
  2128                                  
  2129                                  calc_free_mem:
  2130 00003339 31D2                    	xor	edx, edx
  2131                                  	;xor	ecx, ecx
  2132 0000333B 668B0D[C0330100]        	mov	cx, [mat_size] ; in pages
  2133 00003342 C1E10A                  	shl	ecx, 10	; 1024 dwords per page
  2134 00003345 BE00001000              	mov	esi, MEM_ALLOC_TBL
  2135                                  cfm0:
  2136 0000334A AD                      	lodsd
  2137 0000334B 51                      	push	ecx
  2138 0000334C B920000000              	mov	ecx, 32
  2139                                  cfm1:
  2140 00003351 D1E8                    	shr	eax, 1
  2141 00003353 7301                    	jnc	short cfm2
  2142 00003355 42                      	inc	edx
  2143                                  cfm2:
  2144 00003356 E2F9                    	loop	cfm1
  2145 00003358 59                      	pop	ecx
  2146 00003359 E2EF                    	loop	cfm0
  2147 0000335B C3                      	retn
  2148                                  
  2149                                  %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 0000335C 9C                  <1> 	pushfd
    31 0000335D 0E                  <1> 	push 	cs
    32 0000335E E809000000          <1> 	call 	DISKETTE_IO_1
    33 00003363 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 00003364 9C                  <1> 	pushfd
   457 00003365 0E                  <1> 	push 	cs
   458 00003366 E801000000          <1> 	call 	DISKETTE_IO_1
   459 0000336B C3                  <1> 	retn	
   460                              <1> 
   461                              <1> DISKETTE_IO_1:
   462                              <1> 
   463 0000336C FB                  <1> 	STI				; INTERRUPTS BACK ON
   464 0000336D 55                  <1> 	PUSH	eBP			; USER REGISTER
   465 0000336E 57                  <1> 	PUSH	eDI			; USER REGISTER
   466 0000336F 52                  <1> 	PUSH	eDX			; HEAD #, DRIVE # OR USER REGISTER
   467 00003370 53                  <1> 	PUSH	eBX			; BUFFER OFFSET PARAMETER OR REGISTER
   468 00003371 51                  <1> 	PUSH	eCX			; TRACK #-SECTOR # OR USER REGISTER
   469 00003372 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 00003374 06                  <1> 	push	es ; 06/02/2015	
   484 00003375 1E                  <1> 	PUSH	DS			; BUFFER SEGMENT PARM OR USER REGISTER
   485 00003376 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 00003377 66B91000            <1> 	mov	cx, KDATA
   490 0000337B 8ED9                <1>         mov     ds, cx
   491 0000337D 8EC1                <1>         mov     es, cx
   492                              <1> 
   493                              <1> 	;CMP	AH,(FNC_TAE-FNC_TAB)/2	; CHECK FOR > LARGEST FUNCTION
   494 0000337F 80FC19              <1> 	cmp	ah,(FNC_TAE-FNC_TAB)/4  ; 18/02/2015
   495 00003382 7202                <1> 	JB	short OK_FUNC		; FUNCTION OK
   496 00003384 B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   497                              <1> OK_FUNC:
   498 00003386 80FC01              <1> 	CMP	AH,1			; RESET OR STATUS ?
   499 00003389 760C                <1> 	JBE	short OK_DRV		; IF RESET OR STATUS DRIVE ALWAYS OK
   500 0000338B 80FC08              <1> 	CMP	AH,8			; READ DRIVE PARMS ?
   501 0000338E 7407                <1> 	JZ	short OK_DRV		; IF SO DRIVE CHECKED LATER
   502 00003390 80FA01              <1> 	CMP	DL,1			; DRIVES 0 AND 1 OK
   503 00003393 7602                <1> 	JBE	short OK_DRV		; IF 0 OR 1 THEN JUMP
   504 00003395 B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   505                              <1> OK_DRV:
   506 00003397 31C9                <1> 	xor	ecx, ecx
   507                              <1> 	;mov	esi, ecx ; 08/02/2015
   508 00003399 89CF                <1> 	mov	edi, ecx ; 08/02/2015
   509 0000339B 88E1                <1> 	MOV	CL,AH			; CL = FUNCTION
   510                              <1> 	;XOR	CH,CH			; CX = FUNCTION
   511                              <1> 	;SHL	CL, 1			; FUNCTION TIMES 2
   512 0000339D C0E102              <1> 	SHL	CL, 2 ; 20/02/2015	; FUNCTION TIMES 4 (for 32 bit offset)
   513 000033A0 BB[D8330000]        <1> 	MOV	eBX,FNC_TAB		; LOAD START OF FUNCTION TABLE
   514 000033A5 01CB                <1> 	ADD	eBX,eCX			; ADD OFFSET INTO TABLE => ROUTINE
   515 000033A7 88F4                <1> 	MOV	AH,DH			; AX = HEAD #,# OF SECTORS OR DASD TYPE
   516 000033A9 30F6                <1> 	XOR	DH,DH			; DX = DRIVE #
   517 000033AB 6689C6              <1> 	MOV	SI,AX			; SI = HEAD #,# OF SECTORS OR DASD TYPE
   518 000033AE 6689D7              <1> 	MOV     DI,DX                   ; DI = DRIVE #
   519                              <1> 	;
   520                              <1> 	; 11/12/2014
   521 000033B1 8815[05FA0000]      <1>         mov     [cfd], dl               ; current floppy drive (for 'GET_PARM')        
   522                              <1> 	;
   523 000033B7 8A25[30340100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; LOAD STATUS TO AH FOR STATUS FUNCTION
   524 000033BD C605[30340100]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 000033C4 FF13                <1> 	CALL	dWORD [eBX]		; CALL THE REQUESTED FUNCTION
   545 000033C6 5E                  <1> 	POP	eSI			; RESTORE ALL REGISTERS
   546 000033C7 1F                  <1> 	POP	DS
   547 000033C8 07                  <1> 	pop	es	; 06/02/2015
   548 000033C9 59                  <1> 	POP	eCX
   549 000033CA 5B                  <1> 	POP	eBX
   550 000033CB 5A                  <1> 	POP	eDX
   551 000033CC 5F                  <1> 	POP	eDI
   552 000033CD 89E5                <1> 	MOV	eBP, eSP
   553 000033CF 50                  <1> 	PUSH	eAX
   554 000033D0 9C                  <1> 	PUSHFd
   555 000033D1 58                  <1> 	POP	eAX
   556                              <1> 	;MOV	[BP+6], AX
   557 000033D2 89450C              <1> 	mov	[ebp+12], eax  ; 18/02/2015, flags
   558 000033D5 58                  <1> 	POP	eAX
   559 000033D6 5D                  <1> 	POP	eBP
   560 000033D7 CF                  <1> 	IRETd
   561                              <1> 
   562                              <1> ;-------------------------------------------------------------------------------
   563                              <1> ; DW --> dd (06/02/2015)
   564 000033D8 [3C340000]          <1> FNC_TAB	dd	DSK_RESET		; AH = 00H; RESET
   565 000033DC [B5340000]          <1> 	dd	DSK_STATUS		; AH = 01H; STATUS
   566 000033E0 [C6340000]          <1> 	dd	DSK_READ		; AH = 02H; READ
   567 000033E4 [D7340000]          <1> 	dd	DSK_WRITE		; AH = 03H; WRITE
   568 000033E8 [E8340000]          <1> 	dd	DSK_VERF		; AH = 04H; VERIFY
   569 000033EC [F9340000]          <1> 	dd	DSK_FORMAT		; AH = 05H; FORMAT
   570 000033F0 [7E350000]          <1> 	dd	FNC_ERR			; AH = 06H; INVALID
   571 000033F4 [7E350000]          <1> 	dd	FNC_ERR			; AH = 07H; INVALID
   572 000033F8 [8B350000]          <1> 	dd	DSK_PARMS		; AH = 08H; READ DRIVE PARAMETERS
   573 000033FC [7E350000]          <1> 	dd	FNC_ERR			; AH = 09H; INVALID
   574 00003400 [7E350000]          <1> 	dd	FNC_ERR			; AH = 0AH; INVALID
   575 00003404 [7E350000]          <1> 	dd	FNC_ERR			; AH = 0BH; INVALID
   576 00003408 [7E350000]          <1> 	dd	FNC_ERR			; AH = 0CH; INVALID
   577 0000340C [7E350000]          <1> 	dd	FNC_ERR			; AH = 0DH; INVALID
   578 00003410 [7E350000]          <1> 	dd	FNC_ERR			; AH = 0EH; INVALID
   579 00003414 [7E350000]          <1> 	dd	FNC_ERR			; AH = 0FH; INVALID
   580 00003418 [7E350000]          <1> 	dd	FNC_ERR			; AH = 10H; INVALID
   581 0000341C [7E350000]          <1> 	dd	FNC_ERR			; AH = 11H; INVALID
   582 00003420 [7E350000]          <1> 	dd	FNC_ERR			; AH = 12H; INVALID
   583 00003424 [7E350000]          <1> 	dd	FNC_ERR			; AH = 13H; INVALID
   584 00003428 [7E350000]          <1> 	dd	FNC_ERR			; AH = 14H; INVALID
   585 0000342C [63360000]          <1> 	dd	DSK_TYPE		; AH = 15H; READ DASD TYPE
   586 00003430 [8E360000]          <1> 	dd	DSK_CHANGE		; AH = 16H; CHANGE STATUS
   587 00003434 [C8360000]          <1> 	dd	FORMAT_SET		; AH = 17H; SET DASD TYPE
   588 00003438 [4B370000]          <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 0000343C 66BAF203            <1> 	MOV	DX,03F2H		; ADAPTER CONTROL PORT
   599 00003440 FA                  <1> 	CLI				; NO INTERRUPTS
   600 00003441 A0[2E340100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
   601 00003446 243F                <1> 	AND	AL,00111111B		; KEEP SELECTED AND MOTOR ON BITS
   602 00003448 C0C004              <1> 	ROL	AL,4			; MOTOR VALUE TO HIGH NIBBLE
   603                              <1> 					; DRIVE SELECT TO LOW NIBBLE
   604 0000344B 0C08                <1> 	OR	AL,00001000B		; TURN ON INTERRUPT ENABLE
   605 0000344D EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   606 0000344E C605[2D340100]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 00003455 E6EB                <2>  out 0ebh,al
   612                              <1> 
   613                              <1> 	; 17/12/2014 
   614                              <1> 	; AWARD BIOS 1999 - RESETDRIVES (ADISK.ASM)
   615 00003457 B915000000          <1> 	mov	ecx, WAITCPU_RESET_ON	; cx = 21 -- Min. 14 micro seconds !?
   616                              <1> wdw1:
   617                              <1> 	NEWIODELAY   ; 27/02/2015
   617 0000345C E6EB                <2>  out 0ebh,al
   618 0000345E E2FC                <1> 	loop	wdw1
   619                              <1> 	;
   620 00003460 0C04                <1> 	OR	AL,00000100B		; TURN OFF RESET BIT
   621 00003462 EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   622                              <1> 	; 16/12/2014
   623                              <1> 	IODELAY
   623 00003463 EB00                <2>  jmp short $+2
   623 00003465 EB00                <2>  jmp short $+2
   624                              <1> 	;
   625                              <1> 	;STI				; ENABLE THE INTERRUPTS
   626 00003467 E83C0C0000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
   627 0000346C 723E                <1> 	JC	short DR_ERR		; IF ERROR, RETURN IT
   628 0000346E 66B9C000            <1> 	MOV	CX,11000000B		; CL = EXPECTED @NEC_STATUS
   629                              <1> NXT_DRV:
   630 00003472 6651                <1> 	PUSH	CX			; SAVE FOR CALL
   631 00003474 B8[AA340000]        <1> 	MOV	eAX, DR_POP_ERR 	; LOAD NEC_OUTPUT ERROR ADDRESS
   632 00003479 50                  <1> 	PUSH	eAX			; "
   633 0000347A B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
   634 0000347C E81A0B0000          <1> 	CALL	NEC_OUTPUT
   635 00003481 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
   636 00003482 E8510C0000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
   637 00003487 6659                <1> 	POP	CX			; RESTORE AFTER CALL
   638 00003489 7221                <1> 	JC	short DR_ERR		; ERROR RETURN
   639 0000348B 3A0D[31340100]      <1> 	CMP	CL, [NEC_STATUS]	; TEST FOR DRIVE READY TRANSITION
   640 00003491 7519                <1> 	JNZ	short DR_ERR		; EVERYTHING OK
   641 00003493 FEC1                <1> 	INC	CL			; NEXT EXPECTED @NEC_STATUS
   642 00003495 80F9C3              <1> 	CMP	CL,11000011B		; ALL POSSIBLE DRIVES CLEARED
   643 00003498 76D8                <1> 	JBE	short NXT_DRV		; FALL THRU IF 11000100B OR >
   644                              <1> 	;
   645 0000349A E869030000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   646                              <1> RESBAC:
   647 0000349F E81D090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   648 000034A4 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   649 000034A7 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   650 000034A9 C3                  <1> 	RETn		
   651                              <1> DR_POP_ERR:
   652 000034AA 6659                <1> 	POP	CX			; CLEAR STACK
   653                              <1> DR_ERR:
   654 000034AC 800D[30340100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; SET ERROR CODE
   655 000034B3 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 000034B5 8825[30340100]      <1> 	MOV	[DSKETTE_STATUS],AH	; PUT BACK FOR SETUP END
   667 000034BB E801090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   668 000034C0 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   669 000034C3 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   670 000034C5 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 000034C6 8025[2E340100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   691 000034CD 66B846E6            <1> 	MOV	AX,0E646H		; AX = NEC COMMAND, DMA COMMAND
   692 000034D1 E83C040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   693 000034D6 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 000034D7 66B84AC5            <1> 	MOV	AX,0C54AH		; AX = NEC COMMAND, DMA COMMAND
   714 000034DB 800D[2E340100]80    <1>         OR      byte [MOTOR_STATUS],10000000B ; INDICATE WRITE OPERATION
   715 000034E2 E82B040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   716 000034E7 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 000034E8 8025[2E340100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   734 000034EF 66B842E6            <1> 	MOV	AX,0E642H		; AX = NEC COMMAND, DMA COMMAND
   735 000034F3 E81A040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   736 000034F8 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 000034F9 E853030000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
   755 000034FE E84F050000          <1> 	CALL	FMT_INIT		; ESTABLISH STATE IF UNESTABLISHED
   756 00003503 800D[2E340100]80    <1>         OR      byte [MOTOR_STATUS], 10000000B ; INDICATE WRITE OPERATION
   757 0000350A E897050000          <1> 	CALL	MED_CHANGE		; CHECK MEDIA CHANGE AND RESET IF SO
   758 0000350F 725D                <1>         JC      short FM_DON            ; MEDIA CHANGED, SKIP
   759 00003511 E8F2020000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   760 00003516 E8FD050000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMPT RATE IS SAME AS LAST RATE
   761 0000351B 7405                <1>         JZ      short FM_WR             ; YES, SKIP SPECIFY COMMAND
   762 0000351D E8D4050000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO CONTROLLER
   763                              <1> FM_WR:
   764 00003522 E88A060000          <1> 	CALL	FMTDMA_SET		; SET UP THE DMA FOR FORMAT
   765 00003527 7245                <1>         JC      short FM_DON            ; RETURN WITH ERROR
   766 00003529 B44D                <1> 	MOV	AH,04DH			; ESTABLISH THE FORMAT COMMAND
   767 0000352B E8E7060000          <1> 	CALL	NEC_INIT		; INITIALIZE THE NEC
   768 00003530 723C                <1>         JC      short FM_DON            ; ERROR - EXIT
   769 00003532 B8[6E350000]        <1>         MOV     eAX, FM_DON             ; LOAD ERROR ADDRESS
   770 00003537 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
   771 00003538 B203                <1> 	MOV	DL,3			; BYTES/SECTOR VALUE TO NEC
   772 0000353A E856090000          <1> 	CALL	GET_PARM
   773 0000353F E8570A0000          <1> 	CALL	NEC_OUTPUT
   774 00003544 B204                <1> 	MOV	DL,4			; SECTORS/TRACK VALUE TO NEC
   775 00003546 E84A090000          <1> 	CALL	GET_PARM
   776 0000354B E84B0A0000          <1> 	CALL	NEC_OUTPUT
   777 00003550 B207                <1> 	MOV	DL,7			; GAP LENGTH VALUE TO NEC
   778 00003552 E83E090000          <1> 	CALL	GET_PARM
   779 00003557 E83F0A0000          <1> 	CALL	NEC_OUTPUT
   780 0000355C B208                <1> 	MOV	DL,8			; FILLER BYTE TO NEC
   781 0000355E E832090000          <1> 	CALL	GET_PARM
   782 00003563 E8330A0000          <1> 	CALL	NEC_OUTPUT
   783 00003568 58                  <1> 	POP	eAX			; THROW AWAY ERROR
   784 00003569 E827070000          <1> 	CALL	NEC_TERM		; TERMINATE, RECEIVE STATUS, ETC,
   785                              <1> FM_DON:
   786 0000356E E80F030000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   787 00003573 E849080000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   788 00003578 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   789 0000357B 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   790 0000357D 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 0000357E 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   801 00003581 B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   802 00003583 8825[30340100]      <1> 	MOV	[DSKETTE_STATUS],AH	; STORE IN DATA AREA
   803 00003589 F9                  <1> 	STC				; SET CARRY INDICATING ERROR
   804 0000358A 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 0000358B 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 00003590 29D2                <1> 	sub	edx, edx
   849 00003592 66A1[16FA0000]      <1> 	mov     ax, [fd0_type]
   850 00003598 6621C0              <1> 	and     ax, ax
   851 0000359B 0F848A000000        <1>         jz      NON_DRV
   852 000035A1 FEC2                <1> 	inc     dl
   853 000035A3 20E4                <1> 	and     ah, ah
   854 000035A5 7402                <1> 	jz      short STO_DL
   855 000035A7 FEC2                <1> 	inc     dl
   856                              <1> STO_DL:
   857                              <1> 	;MOV	[BP+4],DL		; STORE NUMBER OF DRIVES
   858 000035A9 895508              <1> 	mov	[ebp+8], edx ; 20/02/2015	 	
   859 000035AC 6683FF01            <1> 	CMP	DI,1			; CHECK FOR VALID DRIVE
   860 000035B0 777C                <1> 	JA	short NON_DRV1		; DRIVE INVALID
   861                              <1> 	;MOV	BYTE [BP+5],1		; MAXIMUM HEAD NUMBER =	1
   862 000035B2 C6450901            <1> 	mov	byte [ebp+9], 1  ; 20/02/2015	
   863 000035B6 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 000035BB 740F                <1> 	JZ	short CHK_EST		; JUMP IF SO
   868 000035BD E81B020000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   869 000035C2 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 000035C4 8A4B04              <1> 	MOV     CL, [eBX+MD.SEC_TRK]     ; GET SECTOR/TRACK
   873 000035C7 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]     ; GET MAX. TRACK NUMBER
   874 000035CA EB36                <1> 	JMP	SHORT STO_CX		; CMOS GOOD, USE CMOS
   875                              <1> CHK_EST:
   876 000035CC 8AA7[3D340100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; LOAD STATE FOR THIS DRIVE
   877 000035D2 F6C410              <1> 	TEST	AH,MED_DET		; CHECK FOR ESTABLISHED STATE
   878 000035D5 7457                <1> 	JZ	short NON_DRV1		; CMOS BAD/INVALID OR UNESTABLISHED
   879                              <1> USE_EST:
   880 000035D7 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE STATE
   881 000035DA 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
   882 000035DD 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 000035DF B001                <1> 	MOV	AL,01			; DRIVE TYPE 1 (360KB)
   887 000035E1 E8F7010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   888 000035E6 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   889 000035E9 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   890 000035EC F687[3D340100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; 80 TRACK ?
   891 000035F3 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 000035F5 B004                <1> 	MOV	AL,04			; DRIVE TYPE 4 (1.44MB)
   897 000035F7 E8E1010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   898 000035FC 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   899 000035FF 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   900                              <1> STO_CX:
   901 00003602 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 00003605 57                  <1> 	push	edi
   914 00003606 8B7D04              <1> 	mov	edi, [ebp+4]  		; ebx (input), user's buffer address
   915 00003609 0FB6C0              <1> 	movzx	eax, al
   916 0000360C 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 0000360F A3[38410100]        <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 00003614 89DE                <1> 	mov	esi, ebx 		; floppy disk parameter table (16 bytes)
   922 00003616 B910000000          <1> 	mov	ecx, 16 ; 16 bytes
   923 0000361B E880AA0000          <1>         call    transfer_to_user_buffer ; trdosk6.s (16/05/2016)
   924 00003620 5F                  <1> 	pop	edi	
   925                              <1> DP_OUT:
   926 00003621 E85C020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   927 00003626 6631C0              <1> 	XOR	AX,AX			; CLEAR
   928 00003629 F8                  <1> 	CLC
   929 0000362A 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 0000362B 895508              <1> 	mov	[ebp+8], edx ; 0 ; 20/02/2015
   936                              <1> NON_DRV1:
   937 0000362E 6681FF8000          <1> 	CMP	DI,80H			; CHECK FOR FIXED MEDIA TYPE REQUEST
   938 00003633 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 00003635 E848020000          <1> 	CALL	XLAT_OLD		; ELSE TRANSLATE TO COMPATIBLE MODE
   943 0000363A 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   944 0000363D B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   945 0000363F F9                  <1> 	STC
   946 00003640 C3                  <1> 	RETn
   947                              <1> 
   948                              <1> NON_DRV2:
   949                              <1> 	;XOR	AX,AX			; CLEAR PARMS IF NO DRIVES OR CMOS BAD
   950 00003641 31C0                <1> 	xor	eax, eax	
   951 00003643 66894500            <1> 	MOV	[eBP],AX		; TRACKS, SECTORS/TRACK = 0
   952                              <1> 	;MOV	[BP+5],AH		; HEAD = 0
   953 00003647 886509              <1> 	mov	[ebp+9], ah ; 06/02/2015
   954                              <1> 	;MOV	[BP+6],AX		; OFFSET TO DISK_BASE = 0
   955 0000364A 89450C              <1> 	mov	[ebp+12], eax
   956                              <1> 	;MOV	ES,AX			; ES IS SEGMENT OF TABLE
   957 0000364D 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 0000364F B002                <1> 	MOV	AL,02			; DRIVE TYPE 2 (1.2MB)
   963 00003651 E887010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   964 00003656 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   965 00003659 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   966 0000365C 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
   967 0000365F 74A1                <1> 	JZ	short STO_CX		; MUST BE 1.2MB DRIVE
   968 00003661 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 00003663 E8E9010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
   980 00003668 8A87[3D340100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET PRESENT STATE INFORMATION
   981 0000366E 08C0                <1> 	OR	AL,AL			; CHECK FOR NO DRIVE
   982 00003670 7418                <1> 	JZ	short NO_DRV
   983 00003672 B401                <1> 	MOV	AH,NOCHGLN		; NO CHANGE LINE FOR 40 TRACK DRIVE
   984 00003674 A801                <1> 	TEST	AL,TRK_CAPA		; IS THIS DRIVE AN 80 TRACK DRIVE?
   985 00003676 7402                <1> 	JZ	short DT_BACK			; IF NO JUMP
   986 00003678 B402                <1> 	MOV	AH,CHGLN		; CHANGE LINE FOR 80 TRACK DRIVE
   987                              <1> DT_BACK:
   988 0000367A 6650                <1> 	PUSH	AX			; SAVE RETURN VALUE
   989 0000367C E801020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   990 00003681 6658                <1> 	POP	AX			; RESTORE RETURN VALUE
   991 00003683 F8                  <1> 	CLC				; NO ERROR
   992 00003684 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   993 00003687 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   994 00003689 C3                  <1> 	RETn
   995                              <1> NO_DRV:	
   996 0000368A 30E4                <1> 	XOR	AH,AH			; NO DRIVE PRESENT OR UNKNOWN
   997 0000368C 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 0000368E E8BE010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1011 00003693 8A87[3D340100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET MEDIA STATE INFORMATION
  1012 00003699 08C0                <1> 	OR	AL,AL			; DRIVE PRESENT ?
  1013 0000369B 7422                <1> 	JZ	short DC_NON		; JUMP IF NO DRIVE
  1014 0000369D A801                <1> 	TEST	AL,TRK_CAPA		; 80 TRACK DRIVE ?
  1015 0000369F 7407                <1> 	JZ	short SETIT		; IF SO , CHECK CHANGE LINE
  1016                              <1> DC0:
  1017 000036A1 E88D0A0000          <1>         CALL    READ_DSKCHNG            ; GO CHECK STATE OF DISK CHANGE LINE
  1018 000036A6 7407                <1> 	JZ	short FINIS		; CHANGE LINE NOT ACTIVE
  1019                              <1> 
  1020 000036A8 C605[30340100]06    <1> SETIT:	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; INDICATE MEDIA REMOVED
  1021                              <1> 
  1022 000036AF E8CE010000          <1> FINIS:	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1023 000036B4 E808070000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1024 000036B9 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
  1025 000036BC 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1026 000036BE C3                  <1> 	RETn
  1027                              <1> DC_NON:
  1028 000036BF 800D[30340100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; SET TIMEOUT, NO DRIVE
  1029 000036C6 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 000036C8 E884010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1045 000036CD 6656                <1> 	PUSH	SI			; SAVE DASD TYPE
  1046 000036CF 6689F0              <1> 	MOV	AX,SI			; AH = ? , AL , DASD TYPE
  1047 000036D2 30E4                <1> 	XOR	AH,AH			; AH , 0 , AL , DASD TYPE
  1048 000036D4 6689C6              <1> 	MOV	SI,AX			; SI = DASD TYPE
  1049 000036D7 80A7[3D340100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1050 000036DE 664E                <1> 	DEC	SI			; CHECK FOR 320/360K MEDIA & DRIVE
  1051 000036E0 7509                <1> 	JNZ	short NOT_320		; BYPASS IF NOT
  1052 000036E2 808F[3D340100]90    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_250 ; SET TO 320/360
  1053 000036E9 EB48                <1> 	JMP	SHORT S0
  1054                              <1> 
  1055                              <1> NOT_320:
  1056 000036EB E8B6030000          <1> 	CALL	MED_CHANGE		; CHECK FOR TIME_OUT
  1057 000036F0 803D[30340100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT
  1058 000036F7 743A                <1> 	JZ	short S0		; IF TIME OUT TELL CALLER
  1059                              <1> S3:
  1060 000036F9 664E                <1> 	DEC	SI			; CHECK FOR 320/360K IN 1.2M DRIVE
  1061 000036FB 7509                <1> 	JNZ	short NOT_320_12	; BYPASS IF NOT
  1062 000036FD 808F[3D340100]70    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+DBL_STEP+RATE_300 ; SET STATE
  1063 00003704 EB2D                <1> 	JMP	SHORT S0
  1064                              <1> 
  1065                              <1> NOT_320_12:
  1066 00003706 664E                <1> 	DEC	SI			; CHECK FOR 1.2M MEDIA IN 1.2M DRIVE
  1067 00003708 7509                <1> 	JNZ	short NOT_12		; BYPASS IF NOT
  1068 0000370A 808F[3D340100]10    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_500 ; SET STATE VARIABLE
  1069 00003711 EB20                <1> 	JMP	SHORT S0		; RETURN TO CALLER
  1070                              <1> 
  1071                              <1> NOT_12:	
  1072 00003713 664E                <1> 	DEC	SI			; CHECK FOR SET DASD TYPE 04
  1073 00003715 752B                <1> 	JNZ	short FS_ERR		; BAD COMMAND EXIT IF NOT VALID TYPE
  1074                              <1> 
  1075 00003717 F687[3D340100]04    <1> 	TEST	byte [DSK_STATE+eDI], DRV_DET ; DRIVE DETERMINED ?
  1076 0000371E 740B                <1> 	JZ	short ASSUME		; IF STILL NOT DETERMINED ASSUME
  1077 00003720 B050                <1> 	MOV	AL,MED_DET+RATE_300
  1078 00003722 F687[3D340100]02    <1>         TEST    byte [DSK_STATE+eDI], FMT_CAPA ; MULTIPLE FORMAT CAPABILITY ?
  1079 00003729 7502                <1> 	JNZ	short OR_IT_IN		; IF 1.2 M THEN DATA RATE 300
  1080                              <1> 
  1081                              <1> ASSUME:
  1082 0000372B B090                <1> 	MOV	AL,MED_DET+RATE_250	; SET UP
  1083                              <1> 
  1084                              <1> OR_IT_IN:
  1085 0000372D 0887[3D340100]      <1> 	OR	[DSK_STATE+eDI], AL	; OR IN THE CORRECT STATE
  1086                              <1> S0:
  1087 00003733 E84A010000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1088 00003738 E884060000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1089 0000373D 665B                <1> 	POP	BX			; GET SAVED AL TO BL
  1090 0000373F 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1091 00003741 C3                  <1> 	RETn
  1092                              <1> 
  1093                              <1> FS_ERR:
  1094 00003742 C605[30340100]01    <1> 	MOV	byte [DSKETTE_STATUS], BAD_CMD ; UNKNOWN STATE,BAD COMMAND
  1095 00003749 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 0000374B E801010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1120 00003750 F687[3D340100]01    <1>         TEST    byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR CHANGE LINE AVAILABLE
  1121 00003757 7415                <1> 	JZ	short SM_CMOS		; JUMP IF 40 TRACK DRIVE
  1122 00003759 E848030000          <1> 	CALL	MED_CHANGE		; RESET CHANGE LINE
  1123 0000375E 803D[30340100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT ; IF TIME OUT TELL CALLER
  1124 00003765 746B                <1> 	JE	short SM_RTN
  1125 00003767 C605[30340100]00    <1> 	MOV	byte [DSKETTE_STATUS], 0 ; CLEAR STATUS
  1126                              <1> SM_CMOS:
  1127 0000376E 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 00003773 745D                <1> 	JZ	short SM_RTN		; RETURN IF SO
  1132 00003775 E863000000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
  1133 0000377A 7231                <1> 	JC	short MD_NOT_FND	; TYPE NOT IN TABLE (BAD CMOS)
  1134 0000377C 57                  <1> 	PUSH	eDI			; SAVE REG.
  1135 0000377D 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR. TYPE TABLE
  1136 0000377F B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1137                              <1> DR_SEARCH:
  1138 00003784 8AA3[90F90000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1139 0000378A 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1140 0000378D 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH ?
  1141 0000378F 7516                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT DRIVE TYPE
  1142                              <1> DR_FND:
  1143 00003791 8BBB[91F90000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAM TABLE
  1144                              <1> MD_SEARCH:
  1145 00003797 8A6704              <1>         MOV     AH, [eDI+MD.SEC_TRK]    ; GET SECTOR/TRACK
  1146 0000379A 386500              <1> 	CMP	[eBP],AH		; MATCH?
  1147 0000379D 7508                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT MEDIA
  1148 0000379F 8A670B              <1>         MOV     AH, [eDI+MD.MAX_TRK]    ; GET MAX. TRACK #
  1149 000037A2 386501              <1> 	CMP 	[eBP+1],AH		; MATCH?
  1150 000037A5 740F                <1> 	JE	short MD_FND		; YES, GO GET RATE
  1151                              <1> NXT_MD:
  1152                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1153 000037A7 83C305              <1>         add	ebx, 5 ; 18/02/2015
  1154 000037AA E2D8                <1> 	LOOP    DR_SEARCH
  1155 000037AC 5F                  <1> 	POP	eDI			; RESTORE REG.
  1156                              <1> MD_NOT_FND:
  1157 000037AD C605[30340100]0C    <1> 	MOV	byte [DSKETTE_STATUS], MED_NOT_FND ; ERROR, MEDIA TYPE NOT FOUND
  1158 000037B4 EB1C                <1> 	JMP	SHORT SM_RTN		; RETURN
  1159                              <1> MD_FND:
  1160 000037B6 8A470C              <1>         MOV     AL, [eDI+MD.RATE]       ; GET RATE
  1161 000037B9 3C40                <1> 	CMP	AL,RATE_300		; DOUBLE STEP REQUIRED FOR RATE 300
  1162 000037BB 7502                <1> 	JNE	short MD_SET
  1163 000037BD 0C20                <1> 	OR	AL,DBL_STEP
  1164                              <1> MD_SET:
  1165                              <1> 	;MOV	[BP+6],DI		; SAVE TABLE POINTER IN STACK
  1166 000037BF 897D0C              <1> 	mov	[ebp+12], edi ; 18/02/2015
  1167 000037C2 0C10                <1> 	OR	AL,MED_DET		; SET MEDIA ESTABLISHED
  1168 000037C4 5F                  <1> 	POP	eDI
  1169 000037C5 80A7[3D340100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1170 000037CC 0887[3D340100]      <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 000037D2 E8AB000000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1175 000037D7 E8E5050000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1176 000037DC 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 000037DD 6650                <1> 	PUSH	AX			
  1193 000037DF 51                  <1> 	PUSH	eCX
  1194 000037E0 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1195 000037E2 B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1196                              <1> TYPE_CHK:	
  1197 000037E7 8AA3[90F90000]      <1> 	MOV	AH,[DR_TYPE+eBX]	; GET DRIVE TYPE
  1198 000037ED 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1199 000037EF 740D                <1> 	JE	short DR_TYPE_VALID	; YES, RETURN WITH CARRY RESET
  1200                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1201 000037F1 83C305              <1>         add	ebx, 5	; 16/02/2015 (32 bit address modification)
  1202 000037F4 E2F1                <1> 	LOOP    TYPE_CHK
  1203                              <1> 	;
  1204 000037F6 BB[EFF90000]        <1> 	mov	ebx, MD_TBL6		; 1.44MB fd parameter table
  1205                              <1> 					; Default for GET_PARM (11/12/2014)
  1206                              <1> 	;
  1207 000037FB F9                  <1> 	STC				; DRIVE TYPE NOT FOUND IN TABLE
  1208 000037FC EB06                <1> 	JMP	SHORT TYPE_RTN
  1209                              <1> DR_TYPE_VALID:
  1210 000037FE 8B9B[91F90000]      <1> 	MOV	eBX,[DR_TYPE+eBX+1] 	; BX = MEDIA TABLE
  1211                              <1> TYPE_RTN:
  1212 00003804 59                  <1> 	POP	eCX
  1213 00003805 6658                <1> 	POP	AX
  1214 00003807 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 00003808 50                  <1> 	PUSH	eAX			; SAVE AX
  1226 00003809 B8[2F380000]        <1> 	MOV	eAX, SPECBAC		; LOAD ERROR ADDRESS
  1227 0000380E 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1228 0000380F B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1229 00003811 E885070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1230 00003816 28D2                <1> 	SUB	DL,DL			; FIRST SPECIFY BYTE
  1231 00003818 E878060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1232 0000381D E879070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1233 00003822 B201                <1> 	MOV	DL,1			; SECOND SPECIFY BYTE
  1234 00003824 E86C060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1235 00003829 E86D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1236 0000382E 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1237                              <1> SPECBAC:
  1238 0000382F 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1239 00003830 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 00003831 50                  <1> 	PUSH	eAX			; SAVE RATE DATA
  1251 00003832 B8[4F380000]        <1> 	MOV	eAX, SPEC_ESBAC		; LOAD ERROR ADDRESS
  1252 00003837 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1253 00003838 B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1254 0000383A E85C070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1255 0000383F 8A23                <1>         MOV     AH, [eBX+MD.SPEC1]      ; GET 1ST SPECIFY BYTE
  1256 00003841 E855070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1257 00003846 8A6301              <1>         MOV     AH, [eBX+MD.SPEC2]      ; GET SECOND SPECIFY BYTE
  1258 00003849 E84D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1259 0000384E 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1260                              <1> SPEC_ESBAC:
  1261 0000384F 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1262 00003850 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 00003851 83FF01              <1> 	CMP	eDI,1				; VALID DRIVE
  1273 00003854 7725                <1> 	JA	short XN_OUT			; IF INVALID BACK
  1274 00003856 80BF[3D340100]00    <1> 	CMP	byte [DSK_STATE+eDI], 0		; NO DRIVE ?
  1275 0000385D 741D                <1> 	JZ	short DO_DET			; IF NO DRIVE ATTEMPT DETERMINE
  1276 0000385F 6689F9              <1> 	MOV	CX,DI				; CX = DRIVE NUMBER
  1277 00003862 C0E102              <1> 	SHL	CL,2				; CL = SHIFT COUNT, A=0, B=4
  1278 00003865 A0[3C340100]        <1> 	MOV	AL, [HF_CNTRL]			; DRIVE INFORMATION
  1279 0000386A D2C8                <1> 	ROR	AL,CL				; TO LOW NIBBLE
  1280 0000386C 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA	; KEEP DRIVE BITS
  1281 0000386E 80A7[3D340100]F8    <1>         AND     byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA)
  1282 00003875 0887[3D340100]      <1> 	OR	[DSK_STATE+eDI], AL		; UPDATE DRIVE STATE
  1283                              <1> XN_OUT:
  1284 0000387B C3                  <1> 	RETn
  1285                              <1> DO_DET:
  1286 0000387C E8BF080000          <1> 	CALL	DRIVE_DET			; TRY TO DETERMINE
  1287 00003881 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 00003882 83FF01              <1> 	CMP	eDI,1			; VALID DRIVE ?
  1298                              <1>         ;JA     short XO_OUT            ; IF INVALID BACK
  1299 00003885 0F8786000000        <1>         ja      XO_OUT
  1300 0000388B 80BF[3D340100]00    <1>         CMP	byte [DSK_STATE+eDI],0	; NO DRIVE ?
  1301 00003892 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 00003894 6689F9              <1> 	MOV	CX,DI			; CX = DRIVE NUMBER
  1306 00003897 C0E102              <1> 	SHL	CL,2			; CL = SHIFT COUNT, A=0, B=4
  1307 0000389A B402                <1> 	MOV	AH,FMT_CAPA		; LOAD MULTIPLE DATA RATE BIT MASK
  1308 0000389C D2CC                <1> 	ROR	AH,CL			; ROTATE BY MASK
  1309 0000389E 8425[3C340100]      <1> 	TEST	[HF_CNTRL], AH		; MULTIPLE-DATA RATE DETERMINED ?
  1310 000038A4 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 000038A6 B407                <1> 	MOV	AH,DRV_DET+FMT_CAPA+TRK_CAPA ; MASK TO KEEP
  1315 000038A8 D2CC                <1> 	ROR	AH,CL			; FIX MASK TO KEEP
  1316 000038AA F6D4                <1> 	NOT	AH			; TRANSLATE MASK
  1317 000038AC 2025[3C340100]      <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 000038B2 8A87[3D340100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; ACCESS STATE
  1322 000038B8 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA ; KEEP DRIVE BITS
  1323 000038BA D2C8                <1> 	ROR	AL,CL			; FIX FOR THIS DRIVE
  1324 000038BC 0805[3C340100]      <1> 	OR	[HF_CNTRL], AL		; UPDATE SAVED DRIVE STATE
  1325                              <1> 
  1326                              <1> ;-----	TRANSLATE TO COMPATIBILITY MODE
  1327                              <1> 
  1328                              <1> SAVE_SET:
  1329 000038C2 8AA7[3D340100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  1330 000038C8 88E7                <1> 	MOV	BH,AH			; TO BH FOR LATER
  1331 000038CA 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE
  1332 000038CD 80FC00              <1> 	CMP	AH,RATE_500		; RATE 500 ?
  1333 000038D0 7410                <1> 	JZ	short CHK_144		; YES 1.2/1.2 OR 1.44/1.44
  1334 000038D2 B001                <1> 	MOV	AL,M3D1U		; AL = 360 IN 1.2 UNESTABLISHED
  1335 000038D4 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
  1336 000038D7 7518                <1> 	JNZ	short CHK_250		; NO, 360/360, 720/720 OR 720/1.44
  1337 000038D9 F6C720              <1> 	TEST	BH,DBL_STEP		; CHECK FOR DOUBLE STEP
  1338 000038DC 751F                <1> 	JNZ	short TST_DET		; MUST BE 360 IN 1.2
  1339                              <1> UNKNO:
  1340 000038DE B007                <1> 	MOV	AL,MED_UNK		; NONE OF THE ABOVE
  1341 000038E0 EB22                <1> 	JMP	SHORT AL_SET		; PROCESS COMPLETE
  1342                              <1> CHK_144:
  1343 000038E2 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 000038E7 74F5                <1> 	jz	short UNKNO ;; 20/02/2015
  1347 000038E9 3C02                <1> 	CMP	AL,2			; 1.2MB DRIVE ?
  1348 000038EB 75F1                <1> 	JNE	short UNKNO		; NO, GO SET 'NONE OF ABOVE'
  1349 000038ED B002                <1> 	MOV	AL,M1D1U		; AL = 1.2 IN 1.2 UNESTABLISHED
  1350 000038EF EB0C                <1> 	JMP	SHORT TST_DET
  1351                              <1> CHK_250:
  1352 000038F1 B000                <1> 	MOV	AL,M3D3U		; AL = 360 IN 360 UNESTABLISHED
  1353 000038F3 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
  1354 000038F6 75E6                <1> 	JNZ	short UNKNO		; IF SO FALL IHRU
  1355 000038F8 F6C701              <1> 	TEST	BH,TRK_CAPA		; 80 TRACK CAPABILITY ?
  1356 000038FB 75E1                <1> 	JNZ	short UNKNO		; IF SO JUMP, FALL THRU TEST DET
  1357                              <1> TST_DET:
  1358 000038FD F6C710              <1> 	TEST	BH,MED_DET		; DETERMINED ?
  1359 00003900 7402                <1> 	JZ	short AL_SET		; IF NOT THEN SET
  1360 00003902 0403                <1> 	ADD	AL,3			; MAKE DETERMINED/ESTABLISHED
  1361                              <1> AL_SET:
  1362 00003904 80A7[3D340100]F8    <1> 	AND	byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA) ; CLEAR DRIVE
  1363 0000390B 0887[3D340100]      <1> 	OR	[DSK_STATE+eDI], AL	; REPLACE WITH COMPATIBLE MODE
  1364                              <1> XO_OUT:
  1365 00003911 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 00003912 6650                <1> 	PUSH	AX			; SAVE DMA, NEC PARAMETERS
  1379 00003914 E838FFFFFF          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1380 00003919 E8F3000000          <1> 	CALL	SETUP_STATE		; INITIALIZE START AND END RATE
  1381 0000391E 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1382                              <1> DO_AGAIN:
  1383 00003920 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1384 00003922 E87F010000          <1> 	CALL	MED_CHANGE		; MEDIA CHANGE AND RESET IF CHANGED
  1385 00003927 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1386 00003929 0F82C9000000        <1>         JC      RWV_END                 ; MEDIA CHANGE ERROR OR TIME-OUT
  1387                              <1> RWV:
  1388 0000392F 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1389 00003931 8AB7[3D340100]      <1> 	MOV	DH, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1390 00003937 80E6C0              <1> 	AND	DH,RATE_MSK		; KEEP ONLY RATE
  1391 0000393A 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 0000393F 7451                <1> 	jz	short RWV_ASSUME ; 20/02/2015
  1395 00003941 3C01                <1> 	CMP	AL,1			; 40 TRACK DRIVE?
  1396 00003943 750D                <1> 	JNE	short RWV_1		; NO, BYPASS CMOS VALIDITY CHECK
  1397 00003945 F687[3D340100]01    <1> 	TEST	byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR 40 TRACK DRIVE
  1398 0000394C 7413                <1> 	JZ	short RWV_2		; YES, CMOS IS CORRECT
  1399 0000394E B002                <1> 	MOV	AL,2			; CHANGE TO 1.2M
  1400 00003950 EB0F                <1> 	JMP	SHORT RWV_2
  1401                              <1> RWV_1:
  1402 00003952 720D                <1> 	JB	short RWV_2		; NO DRIVE SPECIFIED, CONTINUE
  1403 00003954 F687[3D340100]01    <1> 	TEST    byte [DSK_STATE+eDI], TRK_CAPA ; IS IT REALLY 40 TRACK?
  1404 0000395B 7504                <1> 	JNZ	short RWV_2		; NO, 80 TRACK
  1405 0000395D B001                <1> 	MOV	AL,1			; IT IS 40 TRACK, FIX CMOS VALUE
  1406 0000395F EB04                <1> 	jmp	short rwv_3
  1407                              <1> RWV_2:
  1408 00003961 08C0                <1> 	OR	AL,AL			; TEST FOR NO DRIVE
  1409 00003963 742D                <1> 	JZ	short RWV_ASSUME	; ASSUME TYPE, USE MAX TRACK
  1410                              <1> rwv_3:
  1411 00003965 E873FEFFFF          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL.
  1412 0000396A 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 0000396C 57                  <1> 	PUSH	eDI			; SAVE DRIVE #
  1417 0000396D 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1418 0000396F B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1419                              <1> RWV_DR_SEARCH:
  1420 00003974 8AA3[90F90000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1421 0000397A 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1422 0000397D 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1423 0000397F 750B                <1> 	JNE	short RWV_NXT_MD	; NO, CHECK NEXT DRIVE TYPE
  1424                              <1> RWV_DR_FND:
  1425 00003981 8BBB[91F90000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAMETER TABLE
  1426                              <1> RWV_MD_SEARH:
  1427 00003987 3A770C              <1>         CMP     DH, [eDI+MD.RATE]       ; MATCH?
  1428 0000398A 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 0000398C 83C305              <1> 	add	eBX, 5
  1432 0000398F E2E3                <1> 	LOOP	RWV_DR_SEARCH
  1433 00003991 5F                  <1> 	POP	eDI			; RESTORE DRIVE #
  1434                              <1> 
  1435                              <1> ;-----	ASSUME PRIMARY DRIVE IS INSTALLED AS SHIPPED
  1436                              <1> 
  1437                              <1> RWV_ASSUME:
  1438 00003992 BB[AEF90000]        <1> 	MOV	eBX, MD_TBL1		; POINT TO 40 TRACK 250 KBS
  1439 00003997 F687[3D340100]01    <1> 	TEST 	byte [DSK_STATE+eDI], TRK_CAPA ; TEST FOR 80 TRACK
  1440 0000399E 740A                <1> 	JZ	short RWV_MD_FND1	; MUST BE 40 TRACK
  1441 000039A0 BB[C8F90000]        <1> 	MOV	eBX, MD_TBL3		; POINT TO 80 TRACK 500 KBS
  1442 000039A5 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 000039A7 89FB                <1> 	MOV	eBX,eDI			; BX = MEDIA/DRIVE PARAMETER TABLE
  1448 000039A9 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 000039AA E882FEFFFF          <1> 	CALL	SEND_SPEC_MD
  1454 000039AF E864010000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMP RATE IS SAME AS LAST RATE
  1455 000039B4 7405                <1> 	JZ	short RWV_DBL		; YES,SKIP SEND RATE COMMAND
  1456 000039B6 E83B010000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO NEC
  1457                              <1> RWV_DBL:
  1458 000039BB 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1459 000039BC E822040000          <1> 	CALL	SETUP_DBL		; CHECK FOR DOUBLE STEP
  1460 000039C1 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1461 000039C2 7226                <1> 	JC	short CHK_RET		; ERROR FROM READ ID, POSSIBLE RETRY
  1462 000039C4 6658                <1> 	POP	AX			; RESTORE NEC, DMA COMMAND
  1463 000039C6 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1464 000039C8 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1465 000039C9 E861010000          <1> 	CALL	DMA_SETUP		; SET UP THE DMA
  1466 000039CE 5B                  <1> 	POP	eBX 
  1467 000039CF 6658                <1> 	POP	AX			; RESTORE NEC COMMAND
  1468 000039D1 722F                <1> 	JC	short RWV_BAC		; CHECK FOR DMA BOUNDARY ERROR
  1469 000039D3 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1470 000039D5 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1471 000039D6 E83C020000          <1> 	CALL	NEC_INIT		; INITIALIZE NEC
  1472 000039DB 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1473 000039DC 720C                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1474 000039DE E866020000          <1> 	CALL	RWV_COM			; OP CODE COMMON TO READ/WRITE/VERIFY
  1475 000039E3 7205                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1476 000039E5 E8AB020000          <1> 	CALL	NEC_TERM		; TERMINATE, GET STATUS, ETC.
  1477                              <1> CHK_RET:
  1478 000039EA E84A030000          <1> 	CALL	RETRY			; CHECK FOR, SETUP RETRY
  1479 000039EF 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY PARAMETER
  1480 000039F1 7305                <1> 	JNC	short RWV_END		; CY = 0 NO RETRY
  1481 000039F3 E928FFFFFF          <1>         JMP     DO_AGAIN                ; CY = 1 MEANS RETRY
  1482                              <1> RWV_END:
  1483 000039F8 E8F4020000          <1> 	CALL	DSTATE			; ESTABLISH STATE IF SUCCESSFUL
  1484 000039FD E887030000          <1> 	CALL	NUM_TRANS		; AL = NUMBER TRANSFERRED
  1485                              <1> RWV_BAC:				; BAD DMA ERROR ENTRY
  1486 00003A02 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  1487 00003A04 E879FEFFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1488 00003A09 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  1489 00003A0B E8B1030000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1490 00003A10 C3                  <1> 	RETn
  1491                              <1> 
  1492                              <1> ;-------------------------------------------------------------------------------
  1493                              <1> ; SETUP_STATE:	INITIALIZES START AND END RATES.
  1494                              <1> ;-------------------------------------------------------------------------------
  1495                              <1> SETUP_STATE:
  1496 00003A11 F687[3D340100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; MEDIA DETERMINED ?
  1497 00003A18 7537                <1> 	JNZ	short J1C		; NO STATES IF DETERMINED
  1498 00003A1A 66B84000            <1>         MOV     AX,(RATE_500*256)+RATE_300  ; AH = START RATE, AL = END RATE
  1499 00003A1E F687[3D340100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE ?
  1500 00003A25 740D                <1> 	JZ	short AX_SET		; DO NOT KNOW DRIVE
  1501 00003A27 F687[3D340100]02    <1> 	TEST	byte [DSK_STATE+eDI], FMT_CAPA ; MULTI-RATE?
  1502 00003A2E 7504                <1> 	JNZ	short AX_SET		; JUMP IF YES
  1503 00003A30 66B88080            <1>         MOV     AX,RATE_250*257         ; START A END RATE 250 FOR 360 DRIVE
  1504                              <1> AX_SET:	
  1505 00003A34 80A7[3D340100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP) ; TURN OFF THE RATE
  1506 00003A3B 08A7[3D340100]      <1> 	OR	[DSK_STATE+eDI], AH	; RATE FIRST TO TRY
  1507 00003A41 8025[38340100]F3    <1> 	AND	byte [LASTRATE], ~STRT_MSK ; ERASE LAST TO TRY RATE BITS
  1508 00003A48 C0C804              <1> 	ROR	AL,4			; TO OPERATION LAST RATE LOCATION
  1509 00003A4B 0805[38340100]      <1> 	OR	[LASTRATE], AL		; LAST RATE
  1510                              <1> J1C:	
  1511 00003A51 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 00003A52 F687[3D340100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; IS MEDIA ESTABLISHED
  1518 00003A59 7546                <1> 	JNZ	short F1_OUT		; IF SO RETURN
  1519 00003A5B 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 00003A60 7440                <1> 	jz	short CL_DRV ;; 20/02/2015
  1523 00003A62 FEC8                <1> 	DEC	AL			; MAKE ZERO ORIGIN
  1524                              <1> 	;;JS	short CL_DRV		; NO DRIVE IF AL 0
  1525 00003A64 8AA7[3D340100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; AH = CURRENT STATE
  1526 00003A6A 80E40F              <1> 	AND	AH, ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR
  1527 00003A6D 08C0                <1> 	OR	AL,AL			; CHECK FOR 360
  1528 00003A6F 7505                <1> 	JNZ	short N_360		; IF 360 WILL BE 0
  1529 00003A71 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; ESTABLISH MEDIA
  1530 00003A74 EB25                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1531                              <1> N_360:	
  1532 00003A76 FEC8                <1> 	DEC	AL			; 1.2 M DRIVE
  1533 00003A78 7505                <1> 	JNZ	short N_12		; JUMP IF NOT
  1534                              <1> F1_RATE:
  1535 00003A7A 80CC10              <1> 	OR	AH,MED_DET+RATE_500	; SET FORMAT RATE
  1536 00003A7D EB1C                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1537                              <1> N_12:	
  1538 00003A7F FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 3
  1539 00003A81 750F                <1> 	JNZ	short N_720		; JUMP IF NOT
  1540 00003A83 F6C404              <1> 	TEST	AH,DRV_DET		; IS DRIVE DETERMINED
  1541 00003A86 7410                <1> 	JZ	short ISNT_12		; TREAT AS NON 1.2 DRIVE
  1542 00003A88 F6C402              <1> 	TEST	AH,FMT_CAPA		; IS 1.2M
  1543 00003A8B 740B                <1> 	JZ	short ISNT_12		; JUMP IF NOT
  1544 00003A8D 80CC50              <1> 	OR	AH,MED_DET+RATE_300	; RATE 300
  1545 00003A90 EB09                <1> 	JMP	SHORT SKP_STATE		; CONTINUE
  1546                              <1> N_720:
  1547 00003A92 FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 4
  1548 00003A94 750C                <1> 	JNZ	short CL_DRV		; NO DRIVE, CMOS BAD
  1549 00003A96 EBE2                <1> 	JMP	SHORT F1_RATE
  1550                              <1> ISNT_12: 
  1551 00003A98 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; MUST BE RATE 250
  1552                              <1> 
  1553                              <1> SKP_STATE:
  1554 00003A9B 88A7[3D340100]      <1> 	MOV	[DSK_STATE+eDI], AH	; STORE AWAY
  1555                              <1> F1_OUT:
  1556 00003AA1 C3                  <1> 	RETn
  1557                              <1> CL_DRV:	
  1558 00003AA2 30E4                <1> 	XOR	AH,AH			; CLEAR STATE
  1559 00003AA4 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 00003AA6 E888060000          <1> 	CALL	READ_DSKCHNG		; READ DISK CHANCE LINE STATE
  1571 00003AAB 7447                <1> 	JZ	short MC_OUT		; BYPASS HANDLING DISK CHANGE LINE
  1572 00003AAD 80A7[3D340100]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 00003AB4 6689F9              <1> 	MOV	CX,DI			; CL = DRIVE 0
  1579 00003AB7 B001                <1> 	MOV	AL,1			; MOTOR ON BIT MASK
  1580 00003AB9 D2E0                <1> 	SHL	AL,CL			; TO APPROPRIATE POSITION
  1581 00003ABB F6D0                <1> 	NOT	AL			; KEEP ALL BUT MOTOR ON
  1582 00003ABD FA                  <1> 	CLI				; NO INTERRUPTS
  1583 00003ABE 2005[2E340100]      <1> 	AND	[MOTOR_STATUS], AL	; TURN MOTOR OFF INDICATOR
  1584 00003AC4 FB                  <1> 	STI				; INTERRUPTS ENABLED
  1585 00003AC5 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 00003ACA E86DF9FFFF          <1> 	CALL	DSK_RESET		; RESET NEC
  1590 00003ACF B501                <1> 	MOV	CH,01H			; MOVE TO CYLINDER 1
  1591 00003AD1 E8FF040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1592 00003AD6 30ED                <1> 	XOR	CH,CH			; MOVE TO CYLINDER 0
  1593 00003AD8 E8F8040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1594 00003ADD C605[30340100]06    <1> 	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; STORE IN STATUS
  1595                              <1> OK1:
  1596 00003AE4 E84A060000          <1> 	CALL	READ_DSKCHNG		; CHECK MEDIA CHANGED AGAIN
  1597 00003AE9 7407                <1> 	JZ	short OK2		; IF ACTIVE, NO DISKETTE, TIMEOUT
  1598                              <1> OK4:
  1599 00003AEB C605[30340100]80    <1> 	MOV	byte [DSKETTE_STATUS], TIME_OUT ; TIMEOUT IF DRIVE EMPTY
  1600                              <1> OK2:		
  1601 00003AF2 F9                  <1> 	STC				; MEDIA CHANGED, SET CY
  1602 00003AF3 C3                  <1> 	RETn
  1603                              <1> MC_OUT:
  1604 00003AF4 F8                  <1> 	CLC				; NO MEDIA CHANGED, CLEAR CY
  1605 00003AF5 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 00003AF6 6650                <1> 	PUSH	AX			; SAVE REG.
  1616 00003AF8 8025[38340100]3F    <1> 	AND	byte [LASTRATE], ~SEND_MSK ; ELSE CLEAR LAST RATE ATTEMPTED
  1617 00003AFF 8A87[3D340100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1618 00003B05 24C0                <1> 	AND	AL,SEND_MSK		; KEEP ONLY RATE BITS
  1619 00003B07 0805[38340100]      <1> 	OR	[LASTRATE], AL		; SAVE NEW RATE FOR NEXT CHECK
  1620 00003B0D C0C002              <1> 	ROL	AL,2			; MOVE TO BIT OUTPUT POSITIONS
  1621 00003B10 66BAF703            <1> 	MOV	DX,03F7H		; OUTPUT NEW DATA RATE
  1622 00003B14 EE                  <1> 	OUT	DX,AL
  1623 00003B15 6658                <1> 	POP	AX			; RESTORE REG.
  1624 00003B17 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 00003B18 6650                <1> 	PUSH	AX			; SAVE REG
  1638 00003B1A 2225[38340100]      <1> 	AND	AH, [LASTRATE]		; GET LAST DATA RATE SELECTED
  1639 00003B20 8A87[3D340100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1640 00003B26 6625C0C0            <1>         AND     AX, SEND_MSK*257        ; KEEP ONLY RATE BITS OF BOTH
  1641 00003B2A 38E0                <1> 	CMP	AL, AH			; COMPARE TO PREVIOUSLY TRIED
  1642                              <1> 					; ZF = 1 RATE IS THE SAME
  1643 00003B2C 6658                <1> 	POP	AX			; RESTORE REG.
  1644 00003B2E 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 00003B2F 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1674 00003B32 F7C2000000FF        <1> 	test	edx, 0FF000000h		; 16 MB limit (22/08/2015, bugfix)
  1675 00003B38 756E                <1> 	jnz	short dma_bnd_err_stc
  1676                              <1> 	;
  1677 00003B3A 6650                <1> 	push	ax			; DMA command
  1678 00003B3C 52                  <1> 	push	edx			; *
  1679 00003B3D B203                <1> 	mov	dl, 3			; GET BYTES/SECTOR PARAMETER
  1680 00003B3F E851030000          <1> 	call	GET_PARM		; 
  1681 00003B44 88E1                <1> 	mov	cl, ah 			; SHIFT COUNT (0=128, 1=256, 2=512 ETC)
  1682 00003B46 6689F0              <1> 	mov	ax, si			; Sector count
  1683 00003B49 88C4                <1> 	mov	ah, al			; AH =  # OF SECTORS
  1684 00003B4B 28C0                <1> 	sub	al, al			; AL = 0, AX = # SECTORS * 256
  1685 00003B4D 66D1E8              <1> 	shr	ax, 1			; AX = # SECTORS * 128
  1686 00003B50 66D3E0              <1> 	shl	ax, cl			; SHIFT BY PARAMETER VALUE
  1687 00003B53 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1688 00003B55 6689C1              <1> 	mov	cx, ax
  1689 00003B58 5A                  <1> 	pop	edx			; *
  1690 00003B59 6658                <1> 	pop	ax
  1691 00003B5B 3C42                <1> 	cmp	al, 42h
  1692 00003B5D 7507                <1>         jne     short NOT_VERF
  1693 00003B5F BA0000FF00          <1> 	mov	edx, 0FF0000h
  1694 00003B64 EB08                <1> 	jmp	short J33
  1695                              <1> NOT_VERF:
  1696 00003B66 6601CA              <1> 	add	dx, cx			; check for overflow
  1697 00003B69 723E                <1> 	jc	short dma_bnd_err
  1698                              <1> 	;
  1699 00003B6B 6629CA              <1> 	sub	dx, cx			; Restore start address
  1700                              <1> J33:
  1701 00003B6E FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1702 00003B6F E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1703                              <1> 	IODELAY				; WAIT FOR I/O
  1703 00003B71 EB00                <2>  jmp short $+2
  1703 00003B73 EB00                <2>  jmp short $+2
  1704 00003B75 E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1705 00003B77 89D0                <1> 	mov	eax, edx		; Buffer address
  1706 00003B79 E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1707                              <1> 	IODELAY				; WAIT FOR I/O
  1707 00003B7B EB00                <2>  jmp short $+2
  1707 00003B7D EB00                <2>  jmp short $+2
  1708 00003B7F 88E0                <1> 	MOV	AL,AH
  1709 00003B81 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1710 00003B83 C1E810              <1> 	shr	eax, 16
  1711                              <1> 	IODELAY				; I/O WAIT STATE
  1711 00003B86 EB00                <2>  jmp short $+2
  1711 00003B88 EB00                <2>  jmp short $+2
  1712 00003B8A E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1713                              <1> 	IODELAY
  1713 00003B8C EB00                <2>  jmp short $+2
  1713 00003B8E EB00                <2>  jmp short $+2
  1714 00003B90 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1715 00003B93 E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1716                              <1> 	IODELAY				; WAIT FOR I/O
  1716 00003B95 EB00                <2>  jmp short $+2
  1716 00003B97 EB00                <2>  jmp short $+2
  1717 00003B99 88E0                <1> 	MOV	AL, AH
  1718 00003B9B E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1719                              <1> 	IODELAY
  1719 00003B9D EB00                <2>  jmp short $+2
  1719 00003B9F EB00                <2>  jmp short $+2
  1720 00003BA1 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1721 00003BA2 B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1722 00003BA4 E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1723                              <1> 
  1724 00003BA6 F8                  <1> 	clc	; 04/02/2016
  1725 00003BA7 C3                  <1> 	retn
  1726                              <1> 
  1727                              <1> dma_bnd_err_stc:
  1728 00003BA8 F9                  <1> 	stc
  1729                              <1> dma_bnd_err:
  1730 00003BA9 C605[30340100]09    <1> 	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1731 00003BB0 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 00003BB1 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1818 00003BB4 F7C20000F0FF        <1> 	test	edx, 0FFF00000h		; 16 MB limit
  1819 00003BBA 75EC                <1> 	jnz	short dma_bnd_err_stc
  1820                              <1> 	;
  1821 00003BBC 6652                <1> 	push	dx			; *
  1822 00003BBE B204                <1> 	mov	DL, 4			; SECTORS/TRACK VALUE IN PARM TABLE
  1823 00003BC0 E8D0020000          <1> 	call	GET_PARM		; "
  1824 00003BC5 88E0                <1> 	mov	al, ah			; AL = SECTORS/TRACK VALUE
  1825 00003BC7 28E4                <1> 	sub	ah, ah			; AX = SECTORS/TRACK VALUE
  1826 00003BC9 66C1E002            <1> 	shl	ax, 2			; AX = SEC/TRK * 4 (OFFSET C,H,R,N)
  1827 00003BCD 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1828 00003BCF 6689C1              <1> 	mov	cx, ax
  1829 00003BD2 665A                <1> 	pop	dx			; *
  1830 00003BD4 6601CA              <1> 	add	dx, cx			; check for overflow
  1831 00003BD7 72D0                <1> 	jc	short dma_bnd_err
  1832                              <1> 	;
  1833 00003BD9 6629CA              <1> 	sub	dx, cx			; Restore start address
  1834                              <1> 	;
  1835 00003BDC B04A                <1> 	MOV	AL, 04AH		; WILL WRITE TO THE DISKETTE
  1836 00003BDE FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1837 00003BDF E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1838                              <1> 	IODELAY				; WAIT FOR I/O
  1838 00003BE1 EB00                <2>  jmp short $+2
  1838 00003BE3 EB00                <2>  jmp short $+2
  1839 00003BE5 E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1840 00003BE7 89D0                <1> 	mov	eax, edx		; Buffer address
  1841 00003BE9 E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1842                              <1> 	IODELAY				; WAIT FOR I/O
  1842 00003BEB EB00                <2>  jmp short $+2
  1842 00003BED EB00                <2>  jmp short $+2
  1843 00003BEF 88E0                <1> 	MOV	AL,AH
  1844 00003BF1 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1845 00003BF3 C1E810              <1> 	shr	eax, 16
  1846                              <1> 	IODELAY				; I/O WAIT STATE
  1846 00003BF6 EB00                <2>  jmp short $+2
  1846 00003BF8 EB00                <2>  jmp short $+2
  1847 00003BFA E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1848                              <1> 	IODELAY
  1848 00003BFC EB00                <2>  jmp short $+2
  1848 00003BFE EB00                <2>  jmp short $+2
  1849 00003C00 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1850 00003C03 E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1851                              <1> 	IODELAY				; WAIT FOR I/O
  1851 00003C05 EB00                <2>  jmp short $+2
  1851 00003C07 EB00                <2>  jmp short $+2
  1852 00003C09 88E0                <1> 	MOV	AL, AH
  1853 00003C0B E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1854                              <1> 	IODELAY
  1854 00003C0D EB00                <2>  jmp short $+2
  1854 00003C0F EB00                <2>  jmp short $+2
  1855 00003C11 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1856 00003C12 B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1857 00003C14 E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1858 00003C16 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 00003C17 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1933 00003C19 E8BC020000          <1> 	CALL	MOTOR_ON		; TURN MOTOR ON FOR SPECIFIC DRIVE
  1934                              <1> 
  1935                              <1> ;-----	DO THE SEEK OPERATION
  1936                              <1> 
  1937 00003C1E 8A6D01              <1> 	MOV	CH,[eBP+1]		; CH = TRACK #
  1938 00003C21 E8AF030000          <1> 	CALL	SEEK			; MOVE TO CORRECT TRACK
  1939 00003C26 6658                <1> 	POP	AX			; RECOVER COMMAND
  1940 00003C28 721E                <1> 	JC	short ER_1		; ERROR ON SEEK
  1941 00003C2A BB[483C0000]        <1> 	MOV	eBX, ER_1		; LOAD ERROR ADDRESS
  1942 00003C2F 53                  <1> 	PUSH	eBX			; PUSH NEC_OUT ERROR RETURN
  1943                              <1> 
  1944                              <1> ;-----	SEND OUT THE PARAMETERS TO THE CONTROLLER
  1945                              <1> 
  1946 00003C30 E866030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE OPERATION COMMAND
  1947 00003C35 6689F0              <1> 	MOV	AX,SI			; AH = HEAD #
  1948 00003C38 89FB                <1> 	MOV	eBX,eDI			; BL = DRIVE #
  1949 00003C3A C0E402              <1> 	SAL	AH,2			; MOVE IT TO BIT 2
  1950 00003C3D 80E404              <1> 	AND	AH,00000100B		; ISOLATE THAT BIT
  1951 00003C40 08DC                <1> 	OR	AH,BL			; OR IN THE DRIVE NUMBER
  1952 00003C42 E854030000          <1> 	CALL	NEC_OUTPUT		; FALL THRU CY SET IF ERROR
  1953 00003C47 5B                  <1> 	POP	eBX			; THROW AWAY ERROR RETURN
  1954                              <1> ER_1:
  1955 00003C48 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 00003C49 B8[943C0000]        <1> 	MOV	eAX, ER_2		; LOAD ERROR ADDRESS
  1967 00003C4E 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1968 00003C4F 8A6501              <1> 	MOV	AH,[eBP+1]		; OUTPUT TRACK #
  1969 00003C52 E844030000          <1> 	CALL	NEC_OUTPUT
  1970 00003C57 6689F0              <1> 	MOV	AX,SI			; OUTPUT HEAD #
  1971 00003C5A E83C030000          <1> 	CALL	NEC_OUTPUT
  1972 00003C5F 8A6500              <1>         MOV     AH,[eBP]                ; OUTPUT SECTOR #
  1973 00003C62 E834030000          <1> 	CALL	NEC_OUTPUT
  1974 00003C67 B203                <1> 	MOV	DL,3			; BYTES/SECTOR PARAMETER FROM BLOCK
  1975 00003C69 E827020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  1976 00003C6E E828030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  1977 00003C73 B204                <1> 	MOV	DL,4			; EOT PARAMETER FROM BLOCK
  1978 00003C75 E81B020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  1979 00003C7A E81C030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  1980 00003C7F 8A6305              <1>         MOV     AH, [eBX+MD.GAP]        ; GET GAP LENGTH
  1981                              <1> _R15:
  1982 00003C82 E814030000          <1> 	CALL	NEC_OUTPUT
  1983 00003C87 B206                <1> 	MOV	DL,6			; DTL PARAMETER PROM BLOCK
  1984 00003C89 E807020000          <1> 	CALL	GET_PARM		;  TO THE NEC
  1985 00003C8E E808030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  1986 00003C93 58                  <1> 	POP	eAX			; THROW AWAY ERROR EXIT
  1987                              <1> ER_2:
  1988 00003C94 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 00003C95 56                  <1> 	PUSH	eSI			; SAVE HEAD #, # OF SECTORS
  2002 00003C96 E80D040000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2003 00003C9B 9C                  <1> 	PUSHF
  2004 00003C9C E837040000          <1> 	CALL	RESULTS			; GET THE NEC STATUS
  2005 00003CA1 724B                <1> 	JC	short SET_END_POP
  2006 00003CA3 9D                  <1> 	POPF
  2007 00003CA4 723E                <1> 	JC	short SET_END		; LOOK FOR ERROR
  2008                              <1> 
  2009                              <1> ;-----	CHECK THE RESULTS RETURNED BY THE CONTROLLER
  2010                              <1> 
  2011 00003CA6 FC                  <1> 	CLD				; SET THE CORRECT DIRECTION
  2012 00003CA7 BE[31340100]        <1> 	MOV	eSI, NEC_STATUS		; POINT TO STATUS FIELD
  2013 00003CAC AC                  <1> 	lodsb				; GET ST0
  2014 00003CAD 24C0                <1> 	AND	AL,11000000B		; TEST FOR NORMAL TERMINATION
  2015 00003CAF 7433                <1> 	JZ	short SET_END
  2016 00003CB1 3C40                <1> 	CMP	AL,01000000B		; TEST FOR ABNORMAL TERMINATION
  2017 00003CB3 7527                <1> 	JNZ	short J18		; NOT ABNORMAL, BAD NEC
  2018                              <1> 
  2019                              <1> ;-----	ABNORMAL TERMINATION, FIND OUT WHY
  2020                              <1> 
  2021 00003CB5 AC                  <1> 	lodsb				; GET ST1
  2022 00003CB6 D0E0                <1> 	SAL	AL,1			; TEST FOR EDT FOUND
  2023 00003CB8 B404                <1> 	MOV	AH,RECORD_NOT_FND
  2024 00003CBA 7222                <1> 	JC	short J19
  2025 00003CBC C0E002              <1> 	SAL	AL,2
  2026 00003CBF B410                <1> 	MOV	AH,BAD_CRC
  2027 00003CC1 721B                <1> 	JC	short J19
  2028 00003CC3 D0E0                <1> 	SAL	AL,1			; TEST FOR DMA OVERRUN
  2029 00003CC5 B408                <1> 	MOV	AH,BAD_DMA
  2030 00003CC7 7215                <1> 	JC	short J19
  2031 00003CC9 C0E002              <1> 	SAL	AL,2			; TEST FOR RECORD NOT FOUND
  2032 00003CCC B404                <1> 	MOV	AH,RECORD_NOT_FND
  2033 00003CCE 720E                <1> 	JC	short J19
  2034 00003CD0 D0E0                <1> 	SAL	AL,1
  2035 00003CD2 B403                <1> 	MOV	AH,WRITE_PROTECT	; TEST FOR WRITE_PROTECT
  2036 00003CD4 7208                <1> 	JC	short J19
  2037 00003CD6 D0E0                <1> 	SAL	AL,1			; TEST MISSING ADDRESS MARK
  2038 00003CD8 B402                <1> 	MOV	AH,BAD_ADDR_MARK
  2039 00003CDA 7202                <1> 	JC	short J19
  2040                              <1> 
  2041                              <1> ;----- 	NEC MUST HAVE FAILED
  2042                              <1> J18:
  2043 00003CDC B420                <1> 	MOV	AH,BAD_NEC
  2044                              <1> J19:
  2045 00003CDE 0825[30340100]      <1> 	OR	[DSKETTE_STATUS], AH
  2046                              <1> SET_END:
  2047 00003CE4 803D[30340100]01    <1> 	CMP	byte [DSKETTE_STATUS], 1 ; SET ERROR CONDITION
  2048 00003CEB F5                  <1> 	CMC
  2049 00003CEC 5E                  <1> 	POP	eSI
  2050 00003CED C3                  <1> 	RETn				; RESTORE HEAD #, # OF SECTORS
  2051                              <1> 
  2052                              <1> SET_END_POP:
  2053 00003CEE 9D                  <1> 	POPF
  2054 00003CEF EBF3                <1> 	JMP	SHORT SET_END
  2055                              <1> 
  2056                              <1> ;-------------------------------------------------------------------------------
  2057                              <1> ; DSTATE:	ESTABLISH STATE UPON SUCCESSFUL OPERATION.
  2058                              <1> ;-------------------------------------------------------------------------------
  2059                              <1> DSTATE:
  2060 00003CF1 803D[30340100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2061 00003CF8 753E                <1> 	JNZ	short SETBAC		    ; IF ERROR JUMP
  2062 00003CFA 808F[3D340100]10    <1> 	OR	byte [DSK_STATE+eDI],MED_DET ; NO ERROR, MARK MEDIA AS DETERMINED
  2063 00003D01 F687[3D340100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE DETERMINED ?
  2064 00003D08 752E                <1> 	JNZ	short SETBAC		; IF DETERMINED NO TRY TO DETERMINE
  2065 00003D0A 8A87[3D340100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2066 00003D10 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2067 00003D12 3C80                <1> 	CMP	AL,RATE_250		; RATE 250 ?
  2068 00003D14 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 00003D16 E871010000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  2073                              <1> 	;;20/02/2015
  2074                              <1> 	;;JC	short M_12		; CMOS BAD
  2075 00003D1B 7414                <1> 	jz	short M_12 ;; 20/02/2015
  2076 00003D1D 3C04                <1> 	CMP	AL, 4			; 1.44MB DRIVE ?
  2077 00003D1F 7410                <1> 	JE	short M_12		; YES
  2078                              <1> M_720:
  2079 00003D21 80A7[3D340100]FD    <1> 	AND	byte [DSK_STATE+eDI], ~FMT_CAPA ; TURN OFF FORMAT CAPABILITY
  2080 00003D28 808F[3D340100]04    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET  ; MARK DRIVE DETERMINED
  2081 00003D2F EB07                <1> 	JMP	SHORT SETBAC		; BACK
  2082                              <1> M_12:	
  2083 00003D31 808F[3D340100]06    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET+FMT_CAPA 
  2084                              <1> 					; TURN ON DETERMINED & FMT CAPA
  2085                              <1> SETBAC:
  2086 00003D38 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 00003D39 803D[30340100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; GET STATUS OF OPERATION
  2097 00003D40 7445                <1> 	JZ	short NO_RETRY		; SUCCESSFUL OPERATION
  2098 00003D42 803D[30340100]80    <1> 	CMP	byte [DSKETTE_STATUS],TIME_OUT ; IF TIME OUT NO RETRY
  2099 00003D49 743C                <1> 	JZ	short NO_RETRY
  2100 00003D4B 8AA7[3D340100]      <1> 	MOV	AH,[DSK_STATE+eDI]	; GET MEDIA STATE OF DRIVE
  2101 00003D51 F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED/DETERMINED ?
  2102 00003D54 7531                <1> 	JNZ	short NO_RETRY		; IF ESTABLISHED STATE THEN TRUE ERROR
  2103 00003D56 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE RATE
  2104 00003D59 8A2D[38340100]      <1> 	MOV	CH,[LASTRATE]		; GET START OPERATION STATE
  2105 00003D5F C0C504              <1> 	ROL	CH,4			; TO CORRESPONDING BITS
  2106 00003D62 80E5C0              <1> 	AND	CH,RATE_MSK		; ISOLATE RATE BITS
  2107 00003D65 38E5                <1> 	CMP	CH,AH			; ALL RATES TRIED
  2108 00003D67 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 00003D69 80FC01              <1> 	CMP	AH,RATE_500+1		; SET CY FOR RATE 500
  2116 00003D6C D0DC                <1> 	RCR	AH,1			; TO NEXT STATE
  2117 00003D6E 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE BITS
  2118 00003D71 80A7[3D340100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP)
  2119                              <1> 					; RATE, DBL STEP OFF
  2120 00003D78 08A7[3D340100]      <1> 	OR	[DSK_STATE+eDI],AH	; TURN ON NEW RATE
  2121 00003D7E C605[30340100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; RESET STATUS FOR RETRY
  2122 00003D85 F9                  <1> 	STC				; SET CARRY FOR RETRY
  2123 00003D86 C3                  <1> 	RETn				; RETRY RETURN
  2124                              <1> 
  2125                              <1> NO_RETRY:
  2126 00003D87 F8                  <1> 	CLC				; CLEAR CARRY NO RETRY
  2127 00003D88 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 00003D89 30C0                <1> 	XOR	AL,AL			; CLEAR FOR ERROR
  2142 00003D8B 803D[30340100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2143 00003D92 752C                <1> 	JNZ	NT_OUT			; IF ERROR 0 TRANSFERRED
  2144 00003D94 B204                <1> 	MOV	DL,4			; SECTORS/TRACK OFFSET TO DL
  2145 00003D96 E8FA000000          <1> 	CALL	GET_PARM		; AH = SECTORS/TRACK
  2146 00003D9B 8A1D[36340100]      <1> 	MOV	BL, [NEC_STATUS+5]	; GET ENDING SECTOR
  2147 00003DA1 6689F1              <1> 	MOV	CX,SI			; CH = HEAD # STARTED
  2148 00003DA4 3A2D[35340100]      <1> 	CMP	CH, [NEC_STATUS+4]	; GET HEAD ENDED UP ON
  2149 00003DAA 750D                <1> 	JNZ	DIF_HD			; IF ON SAME HEAD, THEN NO ADJUST
  2150 00003DAC 8A2D[34340100]      <1> 	MOV	CH, [NEC_STATUS+3]	; GET TRACK ENDED UP ON
  2151 00003DB2 3A6D01              <1> 	CMP	CH,[eBP+1]		; IS IT ASKED FOR TRACK
  2152 00003DB5 7404                <1> 	JZ	short SAME_TRK		; IF SAME TRACK NO INCREASE
  2153 00003DB7 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2154                              <1> DIF_HD:
  2155 00003DB9 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2156                              <1> SAME_TRK:
  2157 00003DBB 2A5D00              <1> 	SUB	BL,[eBP]		; SUBTRACT START FROM END
  2158 00003DBE 88D8                <1> 	MOV	AL,BL			; TO AL
  2159                              <1> NT_OUT:
  2160 00003DC0 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 00003DC1 B202                <1> 	MOV	DL,2			; GET THE MOTOR WAIT PARAMETER
  2172 00003DC3 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  2173 00003DC5 E8CB000000          <1> 	CALL	GET_PARM
  2174 00003DCA 8825[2F340100]      <1> 	MOV	[MOTOR_COUNT],AH	; STORE UPON RETURN
  2175 00003DD0 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  2176 00003DD2 8A25[30340100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; GET STATUS OF OPERATION
  2177 00003DD8 08E4                <1> 	OR	AH,AH			; CHECK FOR ERROR
  2178 00003DDA 7402                <1> 	JZ	short NUN_ERR		; NO ERROR
  2179 00003DDC 30C0                <1> 	XOR	AL,AL			; CLEAR NUMBER RETURNED
  2180                              <1> NUN_ERR: 
  2181 00003DDE 80FC01              <1> 	CMP	AH,1			; SET THE CARRY FLAG TO INDICATE
  2182 00003DE1 F5                  <1> 	CMC				; SUCCESS OR FAILURE
  2183 00003DE2 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 00003DE3 8AA7[3D340100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  2195 00003DE9 F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED STATE ?
  2196 00003DEC 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 00003DEE C605[2D340100]00    <1> 	MOV	byte [SEEK_STATUS],0	; SET RECALIBRATE REQUIRED ON ALL DRIVES
  2201 00003DF5 E8E0000000          <1> 	CALL	MOTOR_ON		; ENSURE MOTOR STAY ON
  2202 00003DFA B500                <1> 	MOV	CH,0			; LOAD TRACK 0
  2203 00003DFC E8D4010000          <1> 	CALL	SEEK			; SEEK TO TRACK 0
  2204 00003E01 E868000000          <1> 	CALL	READ_ID			; READ ID FUNCTION
  2205 00003E06 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 00003E08 66B95004            <1> 	MOV	CX,0450H 		; START, MAX TRACKS
  2210 00003E0C F687[3D340100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; TEST FOR 80 TRACK CAPABILITY
  2211 00003E13 7402                <1> 	JZ	short CNT_OK		; IF NOT COUNT IS SETUP
  2212 00003E15 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 00003E17 C605[2F340100]FF    <1>         MOV     byte [MOTOR_COUNT], 0FFH ; ENSURE MOTOR STAYS ON FOR OPERATION 
  2220 00003E1E 6651                <1> 	PUSH	CX			; SAVE TRACK, COUNT
  2221 00003E20 C605[30340100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR STATUS, EXPECT ERRORS
  2222 00003E27 6631C0              <1> 	XOR	AX,AX			; CLEAR AX
  2223 00003E2A D0ED                <1> 	SHR	CH,1			; HALVE TRACK, CY = HEAD
  2224 00003E2C C0D003              <1> 	RCL	AL,3			; AX = HEAD IN CORRECT BIT
  2225 00003E2F 6650                <1> 	PUSH	AX			; SAVE HEAD
  2226 00003E31 E89F010000          <1> 	CALL	SEEK			; SEEK TO TRACK
  2227 00003E36 6658                <1> 	POP	AX			; RESTORE HEAD
  2228 00003E38 6609C7              <1> 	OR	DI,AX			; DI = HEAD OR'ED DRIVE
  2229 00003E3B E82E000000          <1> 	CALL	READ_ID			; READ ID HEAD 0
  2230 00003E40 9C                  <1> 	PUSHF				; SAVE RETURN FROM READ_ID
  2231 00003E41 6681E7FB00          <1> 	AND	DI,11111011B		; TURN OFF HEAD 1 BIT
  2232 00003E46 9D                  <1> 	POPF				; RESTORE ERROR RETURN
  2233 00003E47 6659                <1> 	POP	CX			; RESTORE COUNT
  2234 00003E49 7308                <1> 	JNC	short DO_CHK		; IF OK, ASKED = RETURNED TRACK ?
  2235 00003E4B FEC5                <1> 	INC	CH			; INC FOR NEXT TRACK
  2236 00003E4D 38CD                <1> 	CMP	CH,CL			; REACHED MAXIMUM YET
  2237 00003E4F 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 00003E51 F9                  <1> 	STC				; SET CARRY FOR ERROR
  2243 00003E52 C3                  <1> 	RETn				; SETUP_DBL ERROR EXIT
  2244                              <1> 
  2245                              <1> DO_CHK:
  2246 00003E53 8A0D[34340100]      <1> 	MOV	CL, [NEC_STATUS+3]	; LOAD RETURNED TRACK
  2247 00003E59 888F[41340100]      <1> 	MOV	[DSK_TRK+eDI], CL	; STORE TRACK NUMBER
  2248 00003E5F D0ED                <1> 	SHR	CH,1			; HALVE TRACK
  2249 00003E61 38CD                <1> 	CMP	CH,CL			; IS IT THE SAME AS ASKED FOR TRACK
  2250 00003E63 7407                <1> 	JZ	short NO_DBL		; IF SAME THEN NO DOUBLE STEP
  2251 00003E65 808F[3D340100]20    <1> 	OR	byte [DSK_STATE+eDI],DBL_STEP ; TURN ON DOUBLE STEP REQUIRED
  2252                              <1> NO_DBL:
  2253 00003E6C F8                  <1> 	CLC				; CLEAR ERROR FLAG
  2254 00003E6D 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 00003E6E B8[8B3E0000]        <1> 	MOV	eAX, ER_3		; MOVE NEC OUTPUT ERROR ADDRESS
  2267 00003E73 50                  <1> 	PUSH	eAX
  2268 00003E74 B44A                <1> 	MOV	AH,4AH			; READ ID COMMAND
  2269 00003E76 E820010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2270 00003E7B 6689F8              <1> 	MOV	AX,DI			; DRIVE # TO AH, HEAD 0
  2271 00003E7E 88C4                <1> 	MOV	AH,AL
  2272 00003E80 E816010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2273 00003E85 E80BFEFFFF          <1> 	CALL	NEC_TERM		; WAIT FOR OPERATION, GET STATUS
  2274 00003E8A 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  2275                              <1> ER_3:
  2276 00003E8B 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 00003E8C 8A87[16FA0000]      <1> mov	al, [eDI+fd0_type]
  2289 00003E92 20C0                <1> and 	al, al ; 18/12/2014
  2290 00003E94 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 00003E95 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 00003E96 87D3                <1> 	XCHG	eDX,eBX			; BL = INDEX
  2329                              <1> 	;SUB	BH,BH			; BX = INDEX
  2330 00003E98 81E3FF000000        <1> 	and	ebx, 0FFh
  2331                              <1>     	;LDS	SI, [DISK_POINTER]	; POINT TO BLOCK
  2332                              <1> 	;
  2333                              <1> 	; 17/12/2014
  2334 00003E9E 66A1[05FA0000]      <1> 	mov	ax, [cfd] ; current (AL) and previous fd (AH)
  2335 00003EA4 38E0                <1> 	cmp	al, ah
  2336 00003EA6 7425                <1> 	je	short gpndc
  2337 00003EA8 A2[06FA0000]        <1> 	mov	[pfd], al ; current drive -> previous drive
  2338 00003EAD 53                  <1> 	push	ebx ; 08/02/2015
  2339 00003EAE 88C3                <1> 	mov	bl, al 
  2340                              <1> 	; 11/12/2014
  2341 00003EB0 8A83[16FA0000]      <1> 	mov	al, [eBX+fd0_type]	; Drive type (0,1,2,3,4)
  2342                              <1> 	; 18/12/2014
  2343 00003EB6 20C0                <1> 	and	al, al
  2344 00003EB8 7507                <1> 	jnz	short gpdtc
  2345 00003EBA BB[EFF90000]        <1> 	mov	ebx, MD_TBL6		; 1.44 MB param. tbl. (default)
  2346 00003EBF EB05                <1>         jmp     short gpdpu
  2347                              <1> gpdtc:	
  2348 00003EC1 E817F9FFFF          <1> 	call	DR_TYPE_CHECK
  2349                              <1> 	; cf = 1 -> eBX points to 1.44MB fd parameter table (default)
  2350                              <1> gpdpu:
  2351 00003EC6 891D[8CF90000]      <1> 	mov	[DISK_POINTER], ebx
  2352 00003ECC 5B                  <1> 	pop	ebx
  2353                              <1> gpndc:
  2354 00003ECD 8B35[8CF90000]      <1> 	mov	esi, [DISK_POINTER] ; 08/02/2015, si -> esi
  2355 00003ED3 8A241E              <1> 	MOV	AH, [eSI+eBX]		; GET THE WORD
  2356 00003ED6 87D3                <1> 	XCHG	eDX,eBX			; RESTORE BX
  2357 00003ED8 5E                  <1> 	POP	eSI
  2358                              <1> 	;POP	DS
  2359 00003ED9 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 00003EDA 53                  <1> 	PUSH	eBX			; SAVE REG.
  2382 00003EDB E82A000000          <1> 	CALL	TURN_ON			; TURN ON MOTOR
  2383 00003EE0 7226                <1> 	JC	short MOT_IS_ON		; IF CY=1 NO WAIT
  2384 00003EE2 E89BF9FFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  2385 00003EE7 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 00003EEC B20A                <1> 	MOV	DL,10			; GET THE MOTOR WAIT PARAMETER
  2390 00003EEE 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 00003EF3 80FC08              <1> 	cmp	ah, 8
  2395                              <1> 	;JAE	short GP2		; IF YES, CONTINUE
  2396 00003EF6 7702                <1> 	ja	short J13
  2397                              <1> 	;MOV	AL,8			; ONE SECOND WAIT FOR MOTOR START UP
  2398 00003EF8 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 00003EFA B95E200000          <1> 	MOV	eCX,8286		; COUNT FOR 1/8 SECOND AT 15.085737 US
  2405 00003EFF E8DADEFFFF          <1> 	CALL	WAITF			; GO TO FIXED WAIT ROUTINE
  2406                              <1> 	;DEC	AL			; DECREMENT TIME VALUE
  2407 00003F04 FECC                <1> 	dec	ah
  2408 00003F06 75F2                <1> 	JNZ	short J13		; ARE WE DONE YET
  2409                              <1> MOT_IS_ON:
  2410 00003F08 5B                  <1> 	POP	eBX			; RESTORE REG.
  2411 00003F09 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 00003F0A 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2425 00003F0C 88D9                <1> 	MOV	CL,BL			; CL = DRIVE #
  2426 00003F0E C0C304              <1> 	ROL	BL,4			; BL = DRIVE SELECT
  2427 00003F11 FA                  <1> 	CLI				; NO INTERRUPTS WHILE DETERMINING STATUS
  2428 00003F12 C605[2F340100]FF    <1> 	MOV	byte [MOTOR_COUNT],0FFH	; ENSURE MOTOR STAYS ON FOR OPERATION
  2429 00003F19 A0[2E340100]        <1> 	MOV	AL, [MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2430 00003F1E 2430                <1> 	AND	AL,00110000B		; KEEP ONLY DRIVE SELECT BITS
  2431 00003F20 B401                <1> 	MOV	AH,1			; MASK FOR DETERMINING MOTOR BIT
  2432 00003F22 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 00003F24 38D8                <1> 	CMP	AL,BL			; REQUESTED DRIVE ALREADY SELECTED ?
  2439 00003F26 7508                <1> 	JNZ	short TURN_IT_ON	; IF NOT SELECTED JUMP
  2440 00003F28 8425[2E340100]      <1> 	TEST	AH, [MOTOR_STATUS]	; TEST MOTOR ON BIT
  2441 00003F2E 7535                <1> 	JNZ	short NO_MOT_WAIT	; JUMP IF MOTOR ON AND SELECTED
  2442                              <1> 
  2443                              <1> TURN_IT_ON:
  2444 00003F30 08DC                <1> 	OR	AH,BL			; AH = DRIVE SELECT AND MOTOR ON
  2445 00003F32 8A3D[2E340100]      <1> 	MOV	BH,[MOTOR_STATUS]	; SAVE COPY OF @MOTOR_STATUS BEFORE
  2446 00003F38 80E70F              <1> 	AND	BH,00001111B		; KEEP ONLY MOTOR BITS
  2447 00003F3B 8025[2E340100]CF    <1> 	AND	byte [MOTOR_STATUS],11001111B ; CLEAR OUT DRIVE SELECT
  2448 00003F42 0825[2E340100]      <1> 	OR	[MOTOR_STATUS],AH	; OR IN DRIVE SELECTED AND MOTOR ON
  2449 00003F48 A0[2E340100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2450 00003F4D 88C3                <1> 	MOV	BL,AL			; BL=@MOTOR_STATUS AFTER, BH=BEFORE
  2451 00003F4F 80E30F              <1> 	AND	BL,00001111B		; KEEP ONLY MOTOR BITS
  2452 00003F52 FB                  <1> 	STI				; ENABLE INTERRUPTS AGAIN
  2453 00003F53 243F                <1> 	AND	AL,00111111B		; STRIP AWAY UNWANTED BITS
  2454 00003F55 C0C004              <1> 	ROL	AL,4			; PUT BITS IN DESIRED POSITIONS
  2455 00003F58 0C0C                <1> 	OR	AL,00001100B		; NO RESET, ENABLE DMA/INTERRUPT
  2456 00003F5A 66BAF203            <1> 	MOV	DX,03F2H		; SELECT DRIVE AND TURN ON MOTOR
  2457 00003F5E EE                  <1> 	OUT	DX,AL
  2458 00003F5F 38FB                <1> 	CMP	BL,BH			; NEW MOTOR TURNED ON ?
  2459                              <1> 	;JZ	short NO_MOT_WAIT	; NO WAIT REQUIRED IF JUST SELECT
  2460 00003F61 7403                <1> 	je	short no_mot_w1 ; 27/02/2015 
  2461 00003F63 F8                  <1> 	CLC				; (re)SET CARRY MEANING WAIT
  2462 00003F64 C3                  <1> 	RETn
  2463                              <1> 
  2464                              <1> NO_MOT_WAIT:
  2465 00003F65 FB                  <1> 	sti
  2466                              <1> no_mot_w1: ; 27/02/2015
  2467 00003F66 F9                  <1> 	STC				; SET NO WAIT REQUIRED
  2468                              <1> 	;STI				; INTERRUPTS BACK ON
  2469 00003F67 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 00003F68 B209                <1> 	MOV	DL,9			; GET HEAD SETTLE PARAMETER
  2481 00003F6A E826FFFFFF          <1> 	CALL	GET_PARM
  2482 00003F6F 08E4                <1> 	or	ah, ah	; 17/12/2014
  2483 00003F71 7519                <1> 	jnz	short DO_WAT
  2484 00003F73 F605[2E340100]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 00003F7A 741E                <1> 	jz	short HW_DONE
  2489 00003F7C B40F                <1> 	MOV	AH,HD12_SETTLE		; LOAD 1.2M HEAD SETTLE MINIMUM
  2490 00003F7E 8A87[3D340100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2491 00003F84 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2492 00003F86 3C80                <1> 	CMP	AL,RATE_250		; 1.2 M DRIVE ?
  2493 00003F88 7502                <1> 	JNZ	short DO_WAT		; DEFAULT HEAD SETTLE LOADED
  2494                              <1> ;GP3:
  2495 00003F8A 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 00003F8C B942000000          <1> 	MOV	eCX,66			; COUNT AT 15.085737 US PER COUNT
  2509 00003F91 E848DEFFFF          <1> 	CALL	WAITF			; DELAY FOR 1 MILLISECOND
  2510                              <1> 	;DEC	AL			; DECREMENT THE COUNT
  2511 00003F96 FECC                <1> 	dec	ah
  2512 00003F98 75F2                <1> 	JNZ	short J29		; DO AL MILLISECOND # OF TIMES
  2513                              <1> HW_DONE:
  2514 00003F9A 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 00003F9B 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 00003F9F 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 00003FA4 EC                  <1> 	IN	AL,DX			; GET STATUS
  2587 00003FA5 24C0                <1> 	AND	AL,11000000B		; KEEP STATUS AND DIRECTION
  2588 00003FA7 3C80                <1> 	CMP	AL,10000000B		; STATUS 1 AND DIRECTION 0 ?
  2589 00003FA9 7418                <1> 	JZ	short J27		; STATUS AND DIRECTION OK
  2590                              <1> WFPS_HI:
  2591 00003FAB E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2592 00003FAD A810                <1> 	TEST	AL,010H			; transition on memory
  2593 00003FAF 75FA                <1> 	JNZ	SHORT WFPS_HI		; refresh.
  2594                              <1> WFPS_LO:
  2595 00003FB1 E461                <1> 	IN	AL, PORT_B		; SYS1
  2596 00003FB3 A810                <1> 	TEST	AL,010H
  2597 00003FB5 74FA                <1> 	JZ	SHORT WFPS_LO
  2598                              <1> 	;LOOP	SHORT WFPS_CHECK_PORT
  2599 00003FB7 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 00003FB9 800D[30340100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2623                              <1> 	;POP	BX			; RESTORE REG.
  2624 00003FC0 58                  <1> 	POP	eAX ; 08/02/2015	; DISCARD THE RETURN ADDRESS
  2625 00003FC1 F9                  <1> 	STC				; INDICATE ERROR TO CALLER
  2626 00003FC2 C3                  <1> 	RETn
  2627                              <1> 
  2628                              <1> ;-----	DIRECTION AND STATUS OK; OUTPUT BYTE
  2629                              <1> 
  2630                              <1> J27:	
  2631 00003FC3 88E0                <1> 	MOV	AL,AH			; GET BYTE TO OUTPUT
  2632 00003FC5 6642                <1> 	INC	DX			; DATA PORT = STATUS PORT + 1
  2633 00003FC7 EE                  <1> 	OUT	DX,AL			; OUTPUT THE BYTE
  2634                              <1> 	;;NEWIODELAY  ;; 27/02/2015
  2635                              <1> 	; 27/02/2015
  2636 00003FC8 9C                  <1> 	PUSHF				; SAVE FLAGS
  2637 00003FC9 B903000000          <1> 	MOV	eCX, 3			; 30 TO 45 MICROSECONDS WAIT FOR
  2638 00003FCE E80BDEFFFF          <1> 	CALL 	WAITF			; NEC FLAGS UPDATE CYCLE
  2639 00003FD3 9D                  <1> 	POPF				; RESTORE FLAGS FOR EXIT
  2640                              <1> 	;POP	BX			; RESTORE REG
  2641 00003FD4 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 00003FD5 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2657 00003FD7 B001                <1> 	MOV	AL,1			; ESTABLISH MASK FOR RECALIBRATE TEST
  2658 00003FD9 86CB                <1> 	XCHG	CL,BL			; SET DRIVE VALULE INTO CL
  2659 00003FDB D2C0                <1> 	ROL	AL,CL			; SHIFT MASK BY THE DRIVE VALUE
  2660 00003FDD 86CB                <1> 	XCHG	CL,BL			; RECOVER TRACK VALUE
  2661 00003FDF 8405[2D340100]      <1> 	TEST	AL,[SEEK_STATUS]	; TEST FOR RECALIBRATE REQUIRED
  2662 00003FE5 7526                <1> 	JNZ	short J28A		; JUMP IF RECALIBRATE NOT REQUIRED
  2663                              <1> 
  2664 00003FE7 0805[2D340100]      <1> 	OR	[SEEK_STATUS],AL	; TURN ON THE NO RECALIBRATE BIT IN FLAG
  2665 00003FED E862000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2666 00003FF2 730E                <1> 	JNC	short AFT_RECAL		; RECALIBRATE DONE
  2667                              <1> 
  2668                              <1> ;-----	ISSUE RECALIBRATE FOR 80 TRACK DISKETTES
  2669                              <1> 
  2670 00003FF4 C605[30340100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR OUT INVALID STATUS
  2671 00003FFB E854000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2672 00004000 7251                <1> 	JC	short RB		; IF RECALIBRATE FAILS TWICE THEN ERROR
  2673                              <1> 
  2674                              <1> AFT_RECAL:
  2675 00004002 C687[41340100]00    <1>         MOV     byte [DSK_TRK+eDI],0    ; SAVE NEW CYLINDER AS PRESENT POSITION
  2676 00004009 08ED                <1> 	OR	CH,CH			; CHECK FOR SEEK TO TRACK 0
  2677 0000400B 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 0000400D F687[3D340100]20    <1> J28A:	TEST	byte [DSK_STATE+eDI],DBL_STEP ; CHECK FOR DOUBLE STEP REQUIRED
  2682 00004014 7402                <1> 	JZ	short _R7		; SINGLE STEP REQUIRED BYPASS DOUBLE
  2683 00004016 D0E5                <1> 	SHL	CH,1			; DOUBLE NUMBER OF STEP TO TAKE
  2684                              <1> 
  2685 00004018 3AAF[41340100]      <1> _R7:	CMP	CH, [DSK_TRK+eDI]	; SEE IF ALREADY AT THE DESIRED TRACK
  2686 0000401E 7433                <1> 	JE	short RB		; IF YES, DO NOT NEED TO SEEK
  2687                              <1> 
  2688 00004020 BA[53400000]        <1> 	MOV	eDX, NEC_ERR		; LOAD RETURN ADDRESS
  2689 00004025 52                  <1> 	PUSH	eDX ; (*)		; ON STACK FOR NEC OUTPUT ERROR
  2690 00004026 88AF[41340100]      <1> 	MOV	[DSK_TRK+eDI],CH	; SAVE NEW CYLINDER AS PRESENT POSITION
  2691 0000402C B40F                <1> 	MOV	AH,0FH			; SEEK COMMAND TO NEC
  2692 0000402E E868FFFFFF          <1> 	CALL	NEC_OUTPUT
  2693 00004033 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2694 00004035 88DC                <1> 	MOV	AH,BL			; OUTPUT DRIVE NUMBER
  2695 00004037 E85FFFFFFF          <1> 	CALL	NEC_OUTPUT
  2696 0000403C 8AA7[41340100]      <1> 	MOV	AH, [DSK_TRK+eDI]	; GET CYLINDER NUMBER
  2697 00004042 E854FFFFFF          <1> 	CALL	NEC_OUTPUT
  2698 00004047 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 0000404C 9C                  <1> 	PUSHF				; SAVE STATUS
  2704 0000404D E816FFFFFF          <1> 	CALL	HD_WAIT			; WAIT FOR HEAD SETTLE TIME
  2705 00004052 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 00004053 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 00004054 6651                <1> 	PUSH	CX
  2722 00004056 B8[72400000]        <1> 	MOV	eAX, RC_BACK		; LOAD NEC_OUTPUT ERROR
  2723 0000405B 50                  <1> 	PUSH	eAX
  2724 0000405C B407                <1> 	MOV	AH,07H			; RECALIBRATE COMMAND
  2725 0000405E E838FFFFFF          <1> 	CALL	NEC_OUTPUT
  2726 00004063 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2727 00004065 88DC                <1> 	MOV	AH,BL
  2728 00004067 E82FFFFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE DRIVE NUMBER
  2729 0000406C E804000000          <1> 	CALL	CHK_STAT_2		; GET THE INTERRUPT AND SENSE INT STATUS
  2730 00004071 58                  <1> 	POP	eAX			; THROW AWAY ERROR
  2731                              <1> RC_BACK:
  2732 00004072 6659                <1> 	POP	CX
  2733 00004074 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 00004075 B8[9D400000]        <1>         MOV     eAX, CS_BACK            ; LOAD NEC_OUTPUT ERROR ADDRESS
  2745 0000407A 50                  <1> 	PUSH	eAX
  2746 0000407B E828000000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2747 00004080 721A                <1> 	JC	short J34		; IF ERROR, RETURN IT
  2748 00004082 B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
  2749 00004084 E812FFFFFF          <1> 	CALL	NEC_OUTPUT
  2750 00004089 E84A000000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
  2751 0000408E 720C                <1> 	JC	short J34
  2752 00004090 A0[31340100]        <1> 	MOV	AL,[NEC_STATUS]		; GET THE FIRST STATUS BYTE
  2753 00004095 2460                <1> 	AND	AL,01100000B		; ISOLATE THE BITS
  2754 00004097 3C60                <1> 	CMP	AL,01100000B		; TEST FOR CORRECT VALUE
  2755 00004099 7403                <1> 	JZ	short J35		; IF ERROR, GO MARK IT
  2756 0000409B F8                  <1> 	CLC				; GOOD RETURN
  2757                              <1> J34:
  2758 0000409C 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
  2759                              <1> CS_BACK:
  2760 0000409D C3                  <1> 	RETn
  2761                              <1> J35:
  2762 0000409E 800D[30340100]40    <1> 	OR	byte [DSKETTE_STATUS], BAD_SEEK
  2763 000040A5 F9                  <1> 	STC				; ERROR RETURN CODE
  2764 000040A6 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 000040A8 FB                  <1> 	STI				; TURN ON INTERRUPTS, JUST IN CASE
  2783 000040A9 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 000040AA B986450100          <1> 	mov 	ecx, WAIT_FDU_INT_LH	; 83334 (2.5 seconds)		
  2804                              <1> WFMS_CHECK_MEM:
  2805 000040AF F605[2D340100]80    <1> 	test	byte [SEEK_STATUS],INT_FLAG ; TEST FOR INTERRUPT OCCURRING
  2806 000040B6 7516                <1>         jnz     short J37
  2807                              <1> WFMS_HI:
  2808 000040B8 E461                <1> 	IN	AL,PORT_B  ; 061h	; SYS1, wait for lo to hi
  2809 000040BA A810                <1> 	TEST	AL,010H			; transition on memory
  2810 000040BC 75FA                <1> 	JNZ	SHORT WFMS_HI		; refresh.
  2811                              <1> WFMS_LO:
  2812 000040BE E461                <1> 	IN	AL,PORT_B		;SYS1
  2813 000040C0 A810                <1> 	TEST	AL,010H
  2814 000040C2 74FA                <1> 	JZ	SHORT WFMS_LO
  2815 000040C4 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 000040C6 800D[30340100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; NOTHING HAPPENED
  2839 000040CD F9                  <1> 	STC				; ERROR RETURN
  2840                              <1> J37:
  2841 000040CE 9C                  <1> 	PUSHF				; SAVE CURRENT CARRY
  2842 000040CF 8025[2D340100]7F    <1> 	AND	byte [SEEK_STATUS], ~INT_FLAG ; TURN OFF INTERRUPT FLAG
  2843 000040D6 9D                  <1> 	POPF				; RECOVER CARRY
  2844 000040D7 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 000040D8 57                  <1> 	PUSH	eDI
  2856 000040D9 BF[31340100]        <1> 	MOV	eDI, NEC_STATUS		; POINTER TO DATA AREA
  2857 000040DE B307                <1> 	MOV	BL,7			; MAX STATUS BYTES
  2858 000040E0 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 000040E4 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 000040E9 EC                  <1> 	IN	AL,DX			; GET STATUS
  2880 000040EA 24C0                <1> 	AND	AL,11000000B		; KEEP ONLY STATUS AND DIRECTION
  2881 000040EC 3CC0                <1> 	CMP	AL,11000000B		; STATUS 1 AND DIRECTION 1 ?
  2882 000040EE 7418                <1> 	JZ	short J42		; STATUS AND DIRECTION OK
  2883                              <1> WFPSR_HI:
  2884 000040F0 E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2885 000040F2 A810                <1> 	TEST	AL,010H			; transition on memory
  2886 000040F4 75FA                <1> 	JNZ	SHORT WFPSR_HI		; refresh.
  2887                              <1> WFPSR_LO:
  2888 000040F6 E461                <1> 	IN	AL, PORT_B		; SYS1
  2889 000040F8 A810                <1> 	TEST	AL,010H
  2890 000040FA 74FA                <1> 	JZ	SHORT WFPSR_LO
  2891 000040FC 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 000040FE 800D[30340100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2912 00004105 F9                  <1> 	STC				; SET ERROR RETURN
  2913 00004106 EB29                <1> 	JMP	SHORT POPRES		; POP REGISTERS AND RETURN
  2914                              <1> 
  2915                              <1> ;-----	READ IN THE STATUS
  2916                              <1> 
  2917                              <1> J42:
  2918 00004108 EB00                <1> 	JMP	$+2			; I/O DELAY
  2919 0000410A 6642                <1> 	INC	DX			; POINT AT DATA PORT
  2920 0000410C EC                  <1> 	IN	AL,DX			; GET THE DATA
  2921                              <1> 	; 16/12/2014
  2922                              <1> 	NEWIODELAY
  2922 0000410D E6EB                <2>  out 0ebh,al
  2923 0000410F 8807                <1>         MOV     [eDI],AL                ; STORE THE BYTE
  2924 00004111 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 00004112 B903000000          <1> 	MOV	eCX,3			; MINIMUM 24 MICROSECONDS FOR NEC
  2934 00004117 E8C2DCFFFF          <1> 	CALL	WAITF			; WAIT 30 TO 45 MICROSECONDS
  2935 0000411C 664A                <1> 	DEC	DX			; POINT AT STATUS PORT
  2936 0000411E EC                  <1> 	IN	AL,DX			; GET STATUS
  2937                              <1> 	; 16/12/2014
  2938                              <1> 	NEWIODELAY
  2938 0000411F E6EB                <2>  out 0ebh,al
  2939                              <1> 	;
  2940 00004121 A810                <1> 	TEST	AL,00010000B		; TEST FOR NEC STILL BUSY
  2941 00004123 740C                <1> 	JZ	short POPRES		; RESULTS DONE ?
  2942                              <1> 
  2943 00004125 FECB                <1> 	DEC	BL			; DECREMENT THE STATUS COUNTER
  2944 00004127 75BB                <1>         JNZ     short _R10              ; GO BACK FOR MORE
  2945 00004129 800D[30340100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; TOO MANY STATUS BYTES
  2946 00004130 F9                  <1> 	STC				; SET ERROR FLAG
  2947                              <1> 
  2948                              <1> ;-----	RESULT OPERATION IS DONE
  2949                              <1> POPRES:
  2950 00004131 5F                  <1> 	POP	eDI
  2951 00004132 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 00004133 E8A2FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON THE MOTOR IF OFF
  2966 00004138 66BAF703            <1> 	MOV	DX,03F7H		; ADDRESS DIGITAL INPUT REGISTER
  2967 0000413C EC                  <1> 	IN	AL,DX			; INPUT DIGITAL INPUT REGISTER
  2968 0000413D A880                <1> 	TEST	AL,DSK_CHG		; CHECK FOR DISK CHANGE LINE ACTIVE
  2969 0000413F 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 00004140 E895FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON MOTOR IF NOT ALREADY ON
  2979 00004145 E80AFFFFFF          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2980 0000414A 7251                <1> 	JC	short DD_BAC		; ASSUME NO DRIVE PRESENT
  2981 0000414C B530                <1> 	MOV	CH,TRK_SLAP		; SEEK TO TRACK 48
  2982 0000414E E882FEFFFF          <1> 	CALL	SEEK
  2983 00004153 7248                <1> 	JC	short DD_BAC		; ERROR NO DRIVE
  2984 00004155 B50B                <1> 	MOV	CH,QUIET_SEEK+1		; SEEK TO TRACK 10
  2985                              <1> SK_GIN:
  2986 00004157 FECD                <1> 	DEC	CH			; DECREMENT TO NEXT TRACK
  2987 00004159 6651                <1> 	PUSH	CX			; SAVE TRACK
  2988 0000415B E875FEFFFF          <1> 	CALL	SEEK
  2989 00004160 723C                <1> 	JC	short POP_BAC		; POP AND RETURN
  2990 00004162 B8[9E410000]        <1> 	MOV	eAX, POP_BAC		; LOAD NEC OUTPUT ERROR ADDRESS
  2991 00004167 50                  <1> 	PUSH	eAX
  2992 00004168 B404                <1> 	MOV	AH,SENSE_DRV_ST		; SENSE DRIVE STATUS COMMAND BYTE
  2993 0000416A E82CFEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  2994 0000416F 6689F8              <1> 	MOV	AX,DI			; AL = DRIVE
  2995 00004172 88C4                <1> 	MOV	AH,AL			; AH = DRIVE
  2996 00004174 E822FEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  2997 00004179 E85AFFFFFF          <1> 	CALL	RESULTS			; GO GET STATUS
  2998 0000417E 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  2999 0000417F 6659                <1> 	POP	CX			; RESTORE TRACK
  3000 00004181 F605[31340100]10    <1> 	TEST	byte [NEC_STATUS], HOME	; TRACK 0 ?
  3001 00004188 74CD                <1> 	JZ	short SK_GIN		; GO TILL TRACK 0
  3002 0000418A 08ED                <1> 	OR	CH,CH			; IS HOME AT TRACK 0
  3003 0000418C 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 0000418E 808F[3D340100]94    <1> 	OR	byte [DSK_STATE+eDI], DRV_DET+MED_DET+RATE_250
  3009 00004195 C3                  <1> 	RETn				; ALL INFORMATION SET
  3010                              <1> IS_80:
  3011 00004196 808F[3D340100]01    <1> 	OR	byte [DSK_STATE+eDI], TRK_CAPA ; SETUP 80 TRACK CAPABILITY
  3012                              <1> DD_BAC:
  3013 0000419D C3                  <1> 	RETn
  3014                              <1> POP_BAC:
  3015 0000419E 6659                <1> 	POP	CX			; THROW AWAY
  3016 000041A0 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 000041A1 6650                <1> 	PUSH	AX			; SAVE WORK REGISTER
  3032 000041A3 1E                  <1> 	push	ds
  3033 000041A4 66B81000            <1> 	mov	ax, KDATA
  3034 000041A8 8ED8                <1> 	mov 	ds, ax
  3035 000041AA 800D[2D340100]80    <1>         OR      byte [SEEK_STATUS], INT_FLAG ; TURN ON INTERRUPT OCCURRED
  3036 000041B1 B020                <1> 	MOV     AL,EOI                  ; END OF INTERRUPT MARKER
  3037 000041B3 E620                <1> 	OUT	INTA00,AL		; INTERRUPT CONTROL PORT
  3038 000041B5 1F                  <1> 	pop	ds
  3039 000041B6 6658                <1> 	POP	AX			; RECOVER REGISTER
  3040 000041B8 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 000041B9 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 000041BA 31FF                <1> 	XOR	eDI,eDI			; INITIALIZE DRIVE POINTER
  3063 000041BC 66C705[3D340100]00- <1> 	MOV	WORD [DSK_STATE],0	; INITIALIZE STATES
  3063 000041C4 00                  <1>
  3064 000041C5 8025[38340100]33    <1> 	AND	byte [LASTRATE],~(STRT_MSK+SEND_MSK) ; CLEAR START & SEND
  3065 000041CC 800D[38340100]C0    <1> 	OR	byte [LASTRATE],SEND_MSK ; INITIALIZE SENT TO IMPOSSIBLE
  3066 000041D3 C605[2D340100]00    <1> 	MOV	byte [SEEK_STATUS],0	; INDICATE RECALIBRATE NEEDED
  3067 000041DA C605[2F340100]00    <1> 	MOV	byte [MOTOR_COUNT],0	; INITIALIZE MOTOR COUNT
  3068 000041E1 C605[2E340100]00    <1> 	MOV	byte [MOTOR_STATUS],0	; INITIALIZE DRIVES TO OFF STATE
  3069 000041E8 C605[30340100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; NO ERRORS
  3070                              <1> 	;
  3071                              <1> 	; 28/02/2015
  3072                              <1> 	;mov	word [cfd], 100h 
  3073 000041EF E848F2FFFF          <1> 	call	DSK_RESET
  3074 000041F4 5A                  <1> 	pop	edx
  3075 000041F5 F8                  <1> 	clc	; 29/05/2016
  3076 000041F6 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 000041F7 9C                  <1> 	pushfd
  3109 000041F8 0E                  <1> 	push 	cs
  3110 000041F9 E844010000          <1> 	call 	DISK_IO
  3111 000041FE 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 000041FF 90                  <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 00004200 C705[48340100]0000- <1> 	mov 	dword [HDPM_TBL_VEC], (DPT_SEGM*16)+HD0_DPT
  3464 00004208 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 0000420A C705[4C340100]2000- <1> 	mov 	dword [HDPS_TBL_VEC], (DPT_SEGM*16)+HD1_DPT
  3467 00004212 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 00004214 C705[50340100]4000- <1> 	mov 	dword [HDSM_TBL_VEC], (DPT_SEGM*16)+HD2_DPT
  3470 0000421C 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 0000421E C705[54340100]6000- <1> 	mov 	dword [HDSS_TBL_VEC], (DPT_SEGM*16)+HD3_DPT
  3473 00004226 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 00004228 BE[18FA0000]        <1> 	mov	esi, hd0_type
  3500                              <1> 	;mov	cx, 4
  3501 0000422D B904000000          <1> 	mov	ecx, 4
  3502                              <1> hde_l:
  3503 00004232 AC                  <1> 	lodsb
  3504 00004233 3C80                <1> 	cmp	al, 80h			; 8?h = existing
  3505 00004235 7206                <1> 	jb	short _L4
  3506 00004237 FE05[44340100]      <1> 	inc	byte [HF_NUM]		; + 1 hard (fixed) disk drives
  3507                              <1> _L4: ; 26/02/2015
  3508 0000423D 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 0000423F 8A0D[44340100]      <1> 	mov	cl, [HF_NUM]
  3531 00004245 20C9                <1> 	and	cl, cl
  3532 00004247 740E                <1> 	jz	short POD_DONE
  3533                              <1> 	;
  3534 00004249 B27F                <1> 	mov	dl, 7Fh
  3535                              <1> hdc_reset1:
  3536 0000424B 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 0000424D B40D                <1> 	mov	ah, 0Dh ; ALTERNATE RESET
  3557                              <1> 	;int	13h
  3558 0000424F E8A3FFFFFF          <1> 	call	int13h
  3559 00004254 E2F5                <1> 	loop	hdc_reset1
  3560 00004256 F8                  <1> 	clc 	; 29/05/2016
  3561                              <1> POD_DONE:
  3562 00004257 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 00004258 80642408FE          <1> 	and	byte [esp+8], 11111110b  ; clear carry bit of eflags register
  3694                              <1> 	; 16/05/2016
  3695 0000425D 1E                  <1> 	push	ds
  3696 0000425E 53                  <1> 	push	ebx ; user's buffer address (virtual)
  3697 0000425F 66BB1000            <1> 	mov	bx, KDATA ; System (Kernel's) data segment
  3698 00004263 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 00004265 8F05[38410100]      <1> 	pop	dword [user_buffer] ; 01/06/2016
  3708                              <1> 
  3709 0000426B C605[6E3A0100]00    <1> 	mov	byte [scount], 0 ; sector count for transfer
  3710 00004272 80FC03              <1> 	cmp	ah, 03h ; chs write
  3711 00004275 7744                <1> 	ja	short int33h_2
  3712 00004277 7407                <1> 	je	short int33h_0
  3713 00004279 80FC02              <1> 	cmp	ah, 02h ; chs read
  3714 0000427C 726A                <1> 	jb	short int33h_5
  3715 0000427E EB63                <1> 	jmp	short int33h_4
  3716                              <1> int33h_0:
  3717                              <1> 	; transfer user's buffer content to sector buffer
  3718 00004280 51                  <1> 	push	ecx
  3719 00004281 0FB6C8              <1> 	movzx	ecx, al
  3720                              <1> int33h_1:
  3721 00004284 56                  <1> 	push	esi
  3722 00004285 8B35[38410100]      <1> 	mov	esi, [user_buffer]
  3723                              <1> 	; esi = user's buffer address (virtual, ebx)
  3724 0000428B 57                  <1> 	push	edi
  3725 0000428C 06                  <1> 	push	es
  3726 0000428D 50                  <1> 	push	eax
  3727 0000428E 66B81000            <1> 	mov	ax, KDATA
  3728 00004292 8EC0                <1> 	mov	es, ax
  3729 00004294 BF00000700          <1> 	mov	edi, Cluster_Buffer
  3730 00004299 C1E109              <1> 	shl	ecx, 9 ; * 512
  3731 0000429C E8499E0000          <1> 	call	transfer_from_user_buffer
  3732 000042A1 58                  <1> 	pop	eax
  3733 000042A2 07                  <1> 	pop	es
  3734 000042A3 5F                  <1> 	pop	edi
  3735 000042A4 5E                  <1> 	pop	esi
  3736 000042A5 59                  <1> 	pop	ecx
  3737 000042A6 7340                <1> 	jnc	short int33h_5
  3738 000042A8 8B1D[38410100]      <1> 	mov	ebx, [user_buffer] ; 01/06/2016
  3739 000042AE 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 000042AF 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 000042B4 B8FF000000          <1> 	mov	eax, 0FFh ; Unknown error !?
  3757                              <1> 	;iretd
  3758 000042B9 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 000042BB 80FC05              <1> 	cmp	ah, 05h ; format track
  3781 000042BE 770A                <1> 	ja	short int33h_3
  3782 000042C0 7226                <1> 	jb	short int33h_5
  3783 000042C2 51                  <1> 	push	ecx
  3784 000042C3 B901000000          <1> 	mov	ecx, 1
  3785 000042C8 EBBA                <1> 	jmp	short int33h_1
  3786                              <1> int33h_3:
  3787 000042CA 80FC1C              <1> 	cmp	ah, 1Ch ; LBA write
  3788 000042CD 7719                <1> 	ja	short int33h_5
  3789 000042CF 74AF                <1> 	je	short int33h_0
  3790 000042D1 80FC1B              <1> 	cmp	ah, 1Bh ; LBA read
  3791 000042D4 740D                <1> 	je	short int33h_4
  3792 000042D6 80FC08              <1> 	cmp	ah, 08h ; get disk parameters
  3793 000042D9 750D                <1> 	jne	short int33h_5
  3794                              <1> 	; 01/06/2016
  3795 000042DB 8B1D[38410100]      <1> 	mov	ebx, [user_buffer] ; user's buffer address
  3796 000042E1 EB0A                <1> 	jmp	short int33h_6
  3797                              <1> int33h_4:
  3798 000042E3 A2[6E3A0100]        <1> 	mov	byte [scount], al ; <= 128 sectors
  3799                              <1> int33h_5:
  3800 000042E8 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 000042ED 1F                  <1> 	pop	ds
  3805 000042EE 9C                  <1> 	pushfd
  3806 000042EF 0E                  <1> 	push 	cs
  3807 000042F0 E84D000000          <1> 	call 	DISK_IO
  3808 000042F5 2E8B1D[38410100]    <1> 	mov	ebx, [CS:user_buffer] ; 01/06/2016
  3809 000042FC 723D                <1> 	jc	short int33h_9
  3810                              <1> 	;
  3811 000042FE 2E803D[6E3A0100]00  <1> 	cmp	byte [CS:scount], 0
  3812 00004306 762C                <1> 	jna	short int33h_7
  3813                              <1> 	; transfer sector buffer content to user's buffer
  3814 00004308 06                  <1> 	push	es
  3815 00004309 1E                  <1> 	push	ds
  3816 0000430A 50                  <1> 	push	eax
  3817 0000430B 66B81000            <1> 	mov	ax, KDATA
  3818 0000430F 8ED8                <1> 	mov	ds, ax
  3819 00004311 8EC0                <1> 	mov	es, ax
  3820 00004313 51                  <1> 	push	ecx
  3821 00004314 56                  <1> 	push	esi
  3822 00004315 57                  <1> 	push	edi
  3823 00004316 0FB60D[6E3A0100]    <1> 	movzx	ecx, byte [scount]
  3824 0000431D C1E109              <1> 	shl	ecx, 9 ; * 512 bytes
  3825 00004320 89DF                <1> 	mov	edi, ebx ; user's buffer address
  3826 00004322 BE00000700          <1> 	mov	esi, Cluster_Buffer
  3827 00004327 E8749D0000          <1> 	call	transfer_to_user_buffer
  3828 0000432C 5F                  <1> 	pop	edi
  3829 0000432D 5E                  <1> 	pop	esi
  3830 0000432E 59                  <1> 	pop	ecx
  3831 0000432F 58                  <1> 	pop	eax
  3832 00004330 1F                  <1> 	pop	ds
  3833 00004331 07                  <1> 	pop	es
  3834 00004332 7202                <1> 	jc	short int33h_8
  3835                              <1> int33h_7:
  3836 00004334 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 00004335 CF                  <1> 	iretd	
  3841                              <1> int33h_8:
  3842 00004336 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 0000433B 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
  3856                              <1> 	;iretd
  3857 00004340 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 00004342 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 00004345 0F8221F0FFFF        <1> 	jb	DISKETTE_IO_1
  3868                              <1> ;RET_2:
  3869                              <1> 	;RETf	2			; BACK TO CALLER
  3870                              <1> ;	retf	4
  3871                              <1> A1:
  3872 0000434B 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 0000434C 80FA83              <1> 	CMP	DL,(80H + S_MAX_FILE - 1)
  3879                              <1> 	;JA	short RET_2
  3880 0000434F 7616                <1> 	jna	short _A0
  3881                              <1> 	; 29/05/2016
  3882 00004351 1E                  <1> 	push	ds
  3883 00004352 6650                <1> 	push	ax
  3884 00004354 66B81000            <1> 	mov	ax, KDATA
  3885 00004358 8ED8                <1> 	mov	ds, ax
  3886 0000435A 6658                <1> 	pop	ax
  3887 0000435C B4AA                <1>         mov     ah, 0AAh        ; Hard disk drive not ready !
  3888                              <1> 				; (Programmer's guide to AMIBIOS, 1992)
  3889 0000435E 8825[43340100]      <1> 	mov     byte [DISK_STATUS1], ah
  3890 00004364 1F                  <1> 	pop	ds
  3891 00004365 EB38                <1> 	jmp	short RET_2
  3892                              <1> _A0:
  3893                              <1> 	; 18/01/2015
  3894 00004367 08E4                <1> 	or	ah,ah
  3895 00004369 743A                <1> 	jz	short A4
  3896 0000436B 80FC0D              <1> 	cmp	ah, 0Dh	; Alternate reset
  3897 0000436E 7504                <1> 	jne	short A2
  3898 00004370 28E4                <1> 	sub	ah,ah	; Reset
  3899 00004372 EB31                <1> 	jmp	short A4
  3900                              <1> A2:
  3901 00004374 80FC08              <1> 	CMP	AH,08H			; GET PARAMETERS IS A SPECIAL CASE
  3902                              <1> 	;JNZ	short A3
  3903                              <1>         ;JMP    GET_PARM_N
  3904 00004377 0F8431030000        <1> 	je	GET_PARM_N
  3905 0000437D 80FC15              <1> A3:	CMP	AH,15H			; READ DASD TYPE IS ALSO
  3906                              <1> 	;JNZ	short A4
  3907                              <1>         ;JMP    READ_DASD_TYPE
  3908 00004380 0F84DA020000        <1>         je      READ_DASD_TYPE
  3909                              <1> 	; 02/02/2015
  3910 00004386 80FC1D              <1> 	cmp	ah, 1Dh			;(Temporary for Retro UNIX 386 v1)
  3911                              <1> 	; 12/01/2015
  3912 00004389 F5                  <1> 	cmc
  3913 0000438A 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 0000438C 1E                  <1> 	push	ds
  3919 0000438D 6650                <1> 	push	ax
  3920 0000438F 66B81000            <1> 	mov	ax, KDATA
  3921 00004393 8ED8                <1> 	mov	ds, ax
  3922 00004395 6658                <1> 	pop	ax
  3923 00004397 B401                <1> 	mov	ah, BAD_CMD
  3924 00004399 8825[43340100]      <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 0000439F 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  3930 000043A4 CF                  <1> 	iretd
  3931                              <1> A4:					; SAVE REGISTERS DURING OPERATION
  3932 000043A5 C8080000            <1> 	ENTER	8,0			; SAVE (BP) AND MAKE ROOM FOR @CMD_BLOCK
  3933 000043A9 53                  <1> 	PUSH	eBX			;  IN THE STACK, THE COMMAND BLOCK IS:
  3934 000043AA 51                  <1> 	PUSH	eCX			;   @CMD_BLOCK == BYTE PTR [BP]-8
  3935 000043AB 52                  <1> 	PUSH	eDX
  3936 000043AC 1E                  <1> 	PUSH	DS
  3937 000043AD 06                  <1> 	PUSH	ES
  3938 000043AE 56                  <1> 	PUSH	eSI
  3939 000043AF 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 000043B0 6650                <1> 	push	ax
  3949 000043B2 66B81000            <1> 	mov	ax, KDATA
  3950 000043B6 8ED8                <1> 	mov	ds, ax
  3951 000043B8 8EC0                <1> 	mov	es, ax	
  3952 000043BA 6658                <1> 	pop	ax
  3953 000043BC E88D000000          <1> 	CALL	DISK_IO_CONT		; PERFORM THE OPERATION
  3954                              <1> 	;;CALL	DDS			; ESTABLISH SEGMENT
  3955 000043C1 8A25[43340100]      <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 000043C7 5F                  <1> 	POP	eDI			; RESTORE REGISTERS
  3959 000043C8 5E                  <1> 	POP	eSI
  3960 000043C9 07                  <1>         POP     ES
  3961 000043CA 1F                  <1>         POP     DS
  3962 000043CB 5A                  <1> 	POP	eDX
  3963 000043CC 59                  <1> 	POP	eCX
  3964 000043CD 5B                  <1> 	POP	eBX
  3965 000043CE 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 000043CF 80FC01              <1> 	cmp	ah, 1
  3970 000043D2 7205                <1> 	jc	short _A5 
  3971 000043D4 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  3972                              <1> _A5:
  3973 000043D9 CF                  <1> 	iretd
  3974                              <1> 
  3975                              <1> ; 21/02/2015
  3976                              <1> ;       dw --> dd
  3977                              <1> D1:					; FUNCTION TRANSFER TABLE
  3978 000043DA [9C450000]          <1> 	dd	DISK_RESET		; 000H
  3979 000043DE [13460000]          <1> 	dd	RETURN_STATUS		; 001H
  3980 000043E2 [20460000]          <1> 	dd	DISK_READ		; 002H
  3981 000043E6 [29460000]          <1> 	dd	DISK_WRITE		; 003H
  3982 000043EA [32460000]          <1> 	dd	DISK_VERF		; 004H
  3983 000043EE [4A460000]          <1> 	dd	FMT_TRK 		; 005H
  3984 000043F2 [92450000]          <1> 	dd	BAD_COMMAND		; 006H	FORMAT BAD SECTORS
  3985 000043F6 [92450000]          <1> 	dd	BAD_COMMAND		; 007H	FORMAT DRIVE
  3986 000043FA [92450000]          <1> 	dd	BAD_COMMAND		; 008H	RETURN PARAMETERS
  3987 000043FE [35470000]          <1> 	dd	INIT_DRV		; 009H
  3988 00004402 [94470000]          <1> 	dd	RD_LONG 		; 00AH
  3989 00004406 [9D470000]          <1> 	dd	WR_LONG 		; 00BH
  3990 0000440A [A6470000]          <1> 	dd	DISK_SEEK		; 00CH
  3991 0000440E [9C450000]          <1> 	dd	DISK_RESET		; 00DH
  3992 00004412 [92450000]          <1> 	dd	BAD_COMMAND		; 00EH	READ BUFFER
  3993 00004416 [92450000]          <1> 	dd	BAD_COMMAND		; 00FH	WRITE BUFFER
  3994 0000441A [CE470000]          <1> 	dd	TST_RDY 		; 010H
  3995 0000441E [F2470000]          <1> 	dd	HDISK_RECAL		; 011H
  3996 00004422 [92450000]          <1> 	dd	BAD_COMMAND		; 012H	MEMORY DIAGNOSTIC
  3997 00004426 [92450000]          <1> 	dd	BAD_COMMAND		; 013H	DRIVE DIAGNOSTIC
  3998 0000442A [28480000]          <1> 	dd	CTLR_DIAGNOSTIC 	; 014H	CONTROLLER DIAGNOSTIC
  3999                              <1> 	; 02/02/2015 (Temporary - Retro UNIX 386 v1 - DISK I/O test)
  4000 0000442E [92450000]          <1> 	dd	BAD_COMMAND		; 015h
  4001 00004432 [92450000]          <1> 	dd	BAD_COMMAND		; 016h
  4002 00004436 [92450000]          <1> 	dd	BAD_COMMAND		; 017h
  4003 0000443A [92450000]          <1> 	dd	BAD_COMMAND		; 018h
  4004 0000443E [92450000]          <1> 	dd	BAD_COMMAND		; 019h
  4005 00004442 [92450000]          <1> 	dd	BAD_COMMAND		; 01Ah
  4006 00004446 [20460000]          <1> 	dd	DISK_READ		; 01Bh ; LBA read
  4007 0000444A [29460000]          <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 0000444E 80FC01              <1> 	CMP	AH,01H			; RETURN STATUS
  4013                              <1> 	;;JNZ	short SU0
  4014                              <1>         ;;JMP    RETURN_STATUS
  4015 00004451 0F84BC010000        <1> 	je	RETURN_STATUS
  4016                              <1> SU0:
  4017 00004457 C605[43340100]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 0000445E 89DE                <1> 	mov	esi, ebx ; 21/02/2015
  4021 00004460 8A1D[44340100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4022                              <1> 	;; 04/01/2015
  4023                              <1> 	;;PUSH	AX
  4024 00004466 80E27F              <1> 	AND	DL,7FH			; GET DRIVE AS 0 OR 1
  4025                              <1> 					; (get drive number as 0 to 3)
  4026 00004469 38D3                <1> 	CMP	BL,DL
  4027                              <1>         ;;JBE   BAD_COMMAND_POP         ; INVALID DRIVE
  4028 0000446B 0F8621010000        <1>         jbe     BAD_COMMAND ;; 14/02/2015
  4029                              <1>         ;
  4030                              <1> 	;;03/01/2015
  4031 00004471 29DB                <1> 	sub	ebx, ebx
  4032 00004473 88D3                <1> 	mov	bl, dl
  4033                              <1> 	;sub	bh, bh
  4034 00004475 883D[58340100]      <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 0000447B 6650                <1> 	push	ax ; ***
  4043                              <1> 	;PUSH	ES ; **
  4044 0000447D 6652                <1> 	PUSH	DX ; *
  4045 0000447F 6650                <1> 	push	ax
  4046 00004481 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 00004486 668B4310            <1> 	mov	ax, [ebx+16]
  4050 0000448A 66A3[08FA0000]      <1> 	mov	[HF_PORT], ax
  4051                              <1> 	;mov	dx, [ES:BX+18] ; control port address (3F6h, 376h)
  4052 00004490 668B5312            <1> 	mov	dx, [ebx+18]
  4053 00004494 668915[0AFA0000]    <1> 	mov	[HF_REG_PORT], dx
  4054                              <1> 	;mov	al, [ES:BX+20] ; head register upper nibble (A0h,B0h,E0h,F0h)
  4055 0000449B 8A4314              <1> 	mov	al, [ebx+20]
  4056                              <1> 	; 23/02/2015
  4057 0000449E A840                <1> 	test	al, 40h	 ; LBA bit (bit 6)
  4058 000044A0 7406                <1> 	jz 	short su1
  4059 000044A2 FE05[58340100]      <1> 	inc	byte [LBAMode] ; 1 
  4060                              <1> su1: 	 
  4061 000044A8 C0E804              <1> 	shr 	al, 4
  4062 000044AB 2401                <1> 	and	al, 1			
  4063 000044AD A2[0CFA0000]        <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 000044B2 8A4308              <1> 	mov	al, [ebx+8]
  4068                              <1> 	;MOV	DX,[HF_REG_PORT]	; Device Control register	
  4069 000044B5 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 000044B6 8A25[45340100]      <1> 	MOV	AH,[CONTROL_BYTE]	; SET EXTRA HEAD OPTION IN
  4079 000044BC 80E4C0              <1> 	AND	AH,0C0H 		; CONTROL BYTE
  4080 000044BF 08C4                <1> 	OR	AH,AL
  4081 000044C1 8825[45340100]      <1> 	MOV	[CONTROL_BYTE],AH	
  4082                              <1> 	; 04/01/2015
  4083 000044C7 6658                <1> 	pop	ax
  4084 000044C9 665A                <1> 	pop	dx ; * ;; 14/02/2015
  4085 000044CB 20E4                <1> 	and	ah, ah	; Reset function ?
  4086 000044CD 7507                <1> 	jnz	short su2
  4087                              <1> 	;;pop	dx ; * ;; 14/02/2015
  4088                              <1> 	;pop	es ; **
  4089 000044CF 6658                <1> 	pop	ax ; ***
  4090                              <1> 	;;pop	bx
  4091 000044D1 E9C6000000          <1>         jmp     DISK_RESET
  4092                              <1> su2:
  4093 000044D6 803D[58340100]00    <1> 	cmp	byte [LBAMode], 0
  4094 000044DD 7661                <1> 	jna	short su3
  4095                              <1> 	;
  4096                              <1> 	; 02/02/2015 (LBA read/write function calls)
  4097 000044DF 80FC1B              <1> 	cmp	ah, 1Bh
  4098 000044E2 720B                <1> 	jb	short lbarw1
  4099 000044E4 80FC1C              <1> 	cmp	ah, 1Ch
  4100 000044E7 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 000044E9 89C8                <1> 	mov	eax, ecx ; LBA address (21/02/2015)
  4104                              <1> 	;; 14/02/2015
  4105 000044EB 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 000044ED 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 000044EF 6652                <1> 	push	dx ; * ;; 14/02/2015
  4118                              <1> 	;xor	dh, dh
  4119 000044F1 31D2                <1> 	xor	edx, edx
  4120                              <1> 	;mov	dl, [ES:BX+14]	; sectors per track (logical)
  4121 000044F3 8A530E              <1> 	mov	dl, [ebx+14]
  4122                              <1> 	;xor	ah, ah
  4123 000044F6 31C0                <1> 	xor	eax, eax
  4124                              <1> 	;mov	al, [ES:BX+2]	; heads (logical) 	
  4125 000044F8 8A4302              <1> 	mov	al, [ebx+2]
  4126 000044FB FEC8                <1> 	dec	al
  4127 000044FD 6640                <1> 	inc	ax		; 0 =  256
  4128 000044FF 66F7E2              <1> 	mul 	dx
  4129                              <1> 		; AX = # of Heads" * Sectors/Track
  4130 00004502 6689CA              <1> 	mov	dx, cx
  4131                              <1> 	;and	cx, 3Fh	 ; sector  (1 to 63)
  4132 00004505 83E13F              <1> 	and	ecx, 3fh
  4133 00004508 86D6                <1> 	xchg	dl, dh
  4134 0000450A 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 0000450D F7E2                <1> 	mul	edx
  4139 0000450F 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 00004511 01C8                <1> 	add	eax, ecx
  4144 00004513 6659                <1> 	pop	cx ; * ; ch = head, cl = drive number (zero based)
  4145                              <1> 	;push	dx
  4146                              <1> 	;push	ax
  4147 00004515 50                  <1> 	push	eax
  4148                              <1> 	;mov	al, [ES:BX+14]	; sectors per track (logical)	
  4149 00004516 8A430E              <1> 	mov	al, [ebx+14]
  4150 00004519 F6E5                <1> 	mul	ch
  4151                              <1> 		;  AX = Head * Sectors/Track
  4152 0000451B 6699                <1>         cwd
  4153                              <1> 	;pop	dx
  4154 0000451D 5A                  <1> 	pop	edx
  4155                              <1> 	;add	ax, dx
  4156                              <1> 	;pop	dx
  4157                              <1> 	;adc	dx, 0 ; add carry bit
  4158 0000451E 01D0                <1> 	add	eax, edx
  4159                              <1> lbarw2:
  4160 00004520 29D2                <1> 	sub	edx, edx ; 21/02/2015
  4161 00004522 88CA                <1> 	mov	dl, cl ; 21/02/2015
  4162 00004524 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 00004528 8A0D[0CFA0000]      <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 0000452E 80C90E              <1> 	or	cl, 0Eh ; 1110b
  4176                              <1> 	;and	dh, 0Fh		; LBA byte 4 (bits 24 to 27)
  4177 00004531 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh
  4178 00004536 C1E11C              <1> 	shl	ecx, 28 ; 21/02/2015
  4179                              <1> 	;or	dh, ch
  4180 00004539 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 0000453B 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 0000453E 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 00004540 80FC14              <1> 	cmp 	ah, 14h
  4200 00004543 7604                <1> 	jna 	short chsfnc
  4201                              <1> invldfnc:
  4202                              <1>         ; 14/02/2015  
  4203                              <1> 	;pop	es ; **
  4204 00004545 6658                <1>         pop     ax ; ***
  4205                              <1>         ;jmp     short BAD_COMMAND_POP
  4206 00004547 EB49                <1>         jmp     short BAD_COMMAND
  4207                              <1> chsfnc:	
  4208                              <1> 	;MOV	AX,[ES:BX+5]		; GET WRITE PRE-COMPENSATION CYLINDER
  4209 00004549 668B4305            <1> 	mov	ax, [ebx+5]
  4210 0000454D 66C1E802            <1> 	SHR	AX,2
  4211 00004551 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 00004554 88C8                <1> 	MOV	AL,CL			; GET SECTOR NUMBER
  4224 00004556 243F                <1> 	AND	AL,3FH
  4225 00004558 8845FA              <1> 	MOV	[CMD_BLOCK+2],AL
  4226 0000455B 886DFB              <1> 	MOV	[CMD_BLOCK+3],CH 	; GET CYLINDER NUMBER
  4227 0000455E 88C8                <1> 	MOV	AL,CL
  4228 00004560 C0E806              <1> 	SHR	AL,6
  4229 00004563 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 00004566 A0[0CFA0000]        <1> 	mov	al, [hf_m_s]
  4233 0000456B C0E004              <1> 	SHL	AL,4
  4234 0000456E 80E60F              <1> 	AND	DH,0FH			; HEAD NUMBER
  4235 00004571 08F0                <1> 	OR	AL,DH
  4236                              <1> 	;OR	AL,80H or 20H
  4237 00004573 0CA0                <1> 	OR	AL,80h+20h		; ECC AND 512 BYTE SECTORS
  4238 00004575 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 00004578 6658                <1>         pop     ax ; ***
  4249 0000457A 8845F9              <1>         mov     [CMD_BLOCK+1], al
  4250 0000457D 29DB                <1>         sub	ebx, ebx
  4251 0000457F 88E3                <1> 	mov     bl, ah
  4252                              <1>         ;xor     bh, bh
  4253                              <1>         ;sal     bx, 1
  4254 00004581 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 00004585 83FB74              <1> 	cmp	ebx, D1L
  4260 00004588 7308                <1> 	jnb	short BAD_COMMAND
  4261                              <1>         ;xchg    bx, si
  4262 0000458A 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 0000458C FFA6[DA430000]      <1> 	jmp	dword [esi+D1]
  4279                              <1> ;;BAD_COMMAND_POP:
  4280                              <1> ;;	POP	AX
  4281                              <1> ;;	POP	BX
  4282                              <1> BAD_COMMAND:
  4283 00004592 C605[43340100]01    <1>         MOV     byte [DISK_STATUS1],BAD_CMD  ; COMMAND ERROR
  4284 00004599 B000                <1> 	MOV	AL,0
  4285 0000459B 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 0000459C FA                  <1> 	CLI
  4295 0000459D E4A1                <1> 	IN	AL,INTB01		; GET THE MASK REGISTER
  4296                              <1> 	;JMP	$+2
  4297                              <1> 	IODELAY
  4297 0000459F EB00                <2>  jmp short $+2
  4297 000045A1 EB00                <2>  jmp short $+2
  4298                              <1> 	;AND	AL,0BFH 		; ENABLE FIXED DISK INTERRUPT
  4299 000045A3 243F                <1> 	and	al,3Fh			; 22/12/2014 (IRQ 14 & IRQ 15)
  4300 000045A5 E6A1                <1> 	OUT	INTB01,AL
  4301 000045A7 FB                  <1> 	STI				; START INTERRUPTS
  4302                              <1> 	; 14/02/2015
  4303 000045A8 6689D7              <1> 	mov	di, dx	
  4304                              <1> 	; 04/01/2015
  4305                              <1> 	;xor	di,di
  4306                              <1> drst0:
  4307 000045AB B004                <1> 	MOV	AL,04H  ; bit 2 - SRST 
  4308                              <1> 	;MOV	DX,HF_REG_PORT
  4309 000045AD 668B15[0AFA0000]    <1> 	MOV	DX,[HF_REG_PORT]
  4310 000045B4 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 000045B5 B902000000          <1>         mov	ecx, 2 ; 21/02/2015
  4316 000045BA E81FD8FFFF          <1> 	call    WAITF                   ; (Award Bios 1999 - WAIT_REFRESH,
  4317                              <1>                                         ; 40 micro seconds)
  4318 000045BF A0[45340100]        <1> 	mov	al,[CONTROL_BYTE]
  4319 000045C4 240F                <1> 	AND	AL,0FH			; SET HEAD OPTION
  4320 000045C6 EE                  <1> 	OUT	DX,AL			; TURN RESET OFF
  4321 000045C7 E838040000          <1> 	CALL	NOT_BUSY
  4322 000045CC 7515                <1> 	JNZ	short DRERR		; TIME OUT ON RESET
  4323 000045CE 668B15[08FA0000]    <1> 	MOV	DX,[HF_PORT]
  4324 000045D5 FEC2                <1> 	inc	dl  ; HF_PORT+1
  4325                              <1> 	; 02/01/2015 - Award BIOS 1999 - AHDSK.ASM
  4326                              <1>         ;mov     cl, 10
  4327 000045D7 B90A000000          <1>         mov     ecx, 10 ; 21/02/2015 
  4328                              <1> drst1:
  4329 000045DC EC                  <1> 	IN	AL,DX			; GET RESET STATUS
  4330 000045DD 3C01                <1> 	CMP	AL,1
  4331                              <1> 	; 04/01/2015
  4332 000045DF 740A                <1> 	jz	short drst2
  4333                              <1> 	;JNZ	short DRERR		; BAD RESET STATUS
  4334                              <1>         	; Drive/Head Register - bit 4
  4335 000045E1 E2F9                <1> 	loop	drst1
  4336                              <1> DRERR:	
  4337 000045E3 C605[43340100]05    <1> 	MOV	byte [DISK_STATUS1],BAD_RESET ; CARD FAILED
  4338 000045EA C3                  <1> 	RETn
  4339                              <1> drst2:
  4340                              <1> 	; 14/02/2015
  4341 000045EB 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 000045EE A0[0CFA0000]        <1> 	mov	al, [hf_m_s] ; 18/01/2015
  4366 000045F3 A801                <1> 	test	al,1
  4367                              <1> ;	jnz	short drst6
  4368 000045F5 7516                <1>         jnz     short drst4
  4369 000045F7 8065FDEF            <1> 	AND     byte [CMD_BLOCK+5],0EFH ; SET TO DRIVE 0
  4370                              <1> ;drst5:
  4371                              <1> drst3:
  4372 000045FB E835010000          <1> 	CALL	INIT_DRV		; SET MAX HEADS
  4373                              <1> 	;mov	dx,di
  4374 00004600 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 00004605 C605[43340100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; IGNORE ANY SET UP ERRORS
  4382 0000460C C3                  <1> 	RETn
  4383                              <1> ;drst6:
  4384                              <1> drst4:		; Drive/Head Register - bit 4
  4385 0000460D 804DFD10            <1> 	OR      byte [CMD_BLOCK+5],010H ; SET TO DRIVE 1     
  4386                              <1>         ;jmp    short drst5
  4387 00004611 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 00004613 A0[43340100]        <1> 	MOV	AL,[DISK_STATUS1]	; OBTAIN PREVIOUS STATUS
  4395 00004618 C605[43340100]00    <1>         MOV     byte [DISK_STATUS1],0   ; RESET STATUS
  4396 0000461F C3                  <1> 	RETn
  4397                              <1> 
  4398                              <1> ;----------------------------------------
  4399                              <1> ;	DISK READ ROUTINE    (AH = 02H) :
  4400                              <1> ;----------------------------------------
  4401                              <1> 
  4402                              <1> DISK_READ:
  4403 00004620 C645FE20            <1> 	MOV	byte [CMD_BLOCK+6],READ_CMD
  4404 00004624 E954020000          <1>         JMP     COMMANDI
  4405                              <1> 
  4406                              <1> ;----------------------------------------
  4407                              <1> ;	DISK WRITE ROUTINE   (AH = 03H) :
  4408                              <1> ;----------------------------------------
  4409                              <1> 
  4410                              <1> DISK_WRITE:
  4411 00004629 C645FE30            <1> 	MOV	byte [CMD_BLOCK+6],WRITE_CMD
  4412 0000462D E9A6020000          <1>         JMP     COMMANDO
  4413                              <1> 
  4414                              <1> ;----------------------------------------
  4415                              <1> ;	DISK VERIFY	     (AH = 04H) :
  4416                              <1> ;----------------------------------------
  4417                              <1> 
  4418                              <1> DISK_VERF:
  4419 00004632 C645FE40            <1> 	MOV	byte [CMD_BLOCK+6],VERIFY_CMD
  4420 00004636 E814030000          <1> 	CALL	COMMAND
  4421 0000463B 750C                <1> 	JNZ	short VERF_EXIT		; CONTROLLER STILL BUSY
  4422 0000463D E886030000          <1> 	CALL	_WAIT			; (Original: CALL WAIT)	
  4423 00004642 7505                <1> 	JNZ	short VERF_EXIT		; TIME OUT
  4424 00004644 E813040000          <1> 	CALL	CHECK_STATUS
  4425                              <1> VERF_EXIT:
  4426 00004649 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 0000464A C645FE50            <1> 	MOV	byte [CMD_BLOCK+6],FMTTRK_CMD
  4434                              <1> 	;PUSH	ES
  4435                              <1> 	;PUSH	BX
  4436 0000464E 53                  <1> 	push	ebx
  4437 0000464F E8BA040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS ADDRESS
  4438                              <1> 	;MOV	AL,[ES:BX+14]		; GET SECTORS/TRACK
  4439 00004654 8A430E              <1> 	mov	al, [ebx+14]
  4440 00004657 8845F9              <1> 	MOV	[CMD_BLOCK+1],AL 	; SET SECTOR COUNT IN COMMAND
  4441 0000465A 5B                  <1> 	pop	ebx
  4442                              <1> 	;POP	BX
  4443                              <1> 	;POP	ES
  4444 0000465B 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 00004660 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4453                              <1> 	;PUSH	ES
  4454 00004661 53                  <1> 	PUSH	eBX
  4455                              <1> 	;CALL	DDS			; ESTABLISH ADDRESSING
  4456                              <1> 	;push	cs
  4457                              <1> 	;pop	ds
  4458 00004662 66BB1000            <1>         mov	bx, KDATA
  4459 00004666 8EDB                <1> 	mov	ds, bx
  4460                              <1> 	;mov	es, bx
  4461 00004668 C605[43340100]00    <1> 	MOV     byte [DISK_STATUS1],0
  4462 0000466F 8A1D[44340100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4463 00004675 80E27F              <1> 	AND	DL,7FH			; GET DRIVE NUMBER
  4464 00004678 38D3                <1> 	CMP	BL,DL
  4465 0000467A 7627                <1> 	JBE	short RDT_NOT_PRESENT 	; RETURN DRIVE NOT PRESENT
  4466 0000467C E88D040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETER ADDRESS
  4467                              <1> 	;MOV	AL,[ES:BX+2]		; HEADS
  4468 00004681 8A4302              <1> 	mov	al, [ebx+2]
  4469                              <1> 	;MOV	CL,[ES:BX+14]
  4470 00004684 8A4B0E              <1> 	mov	cl, [ebx+14]
  4471 00004687 F6E9                <1> 	IMUL	CL			; * NUMBER OF SECTORS
  4472                              <1> 	;MOV	CX,[ES:BX]		; MAX NUMBER OF CYLINDERS
  4473 00004689 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 0000468C 6649                <1> 	DEC	CX			; LEAVE ONE FOR DIAGNOSTICS
  4479                              <1> 	;
  4480 0000468E 66F7E9              <1> 	IMUL	CX			; NUMBER OF SECTORS
  4481 00004691 6689D1              <1> 	MOV	CX,DX			; HIGH ORDER HALF
  4482 00004694 6689C2              <1> 	MOV	DX,AX			; LOW ORDER HALF
  4483                              <1> 	;SUB	AX,AX
  4484 00004697 28C0                <1> 	sub	al, al
  4485 00004699 B403                <1> 	MOV	AH,03H			; INDICATE FIXED DISK
  4486 0000469B 5B                  <1> RDT2:	POP	eBX			; RESTORE REGISTERS
  4487                              <1> 	;POP	ES
  4488 0000469C 1F                  <1> 	POP	DS
  4489                              <1> 	; (*) CLC			; CLEAR CARRY
  4490                              <1> 	;RETf	2
  4491                              <1> 	; (*) 29/05/2016
  4492                              <1> 	; (*) retf 4
  4493 0000469D 80642408FE          <1> 	and	byte [esp+8], 0FEh ; clear carry bit of eflags register
  4494 000046A2 CF                  <1> 	iretd
  4495                              <1> 
  4496                              <1> RDT_NOT_PRESENT:
  4497 000046A3 6629C0              <1> 	SUB	AX,AX			; DRIVE NOT PRESENT RETURN
  4498 000046A6 6689C1              <1> 	MOV	CX,AX			; ZERO BLOCK COUNT
  4499 000046A9 6689C2              <1> 	MOV	DX,AX
  4500 000046AC 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 000046AE 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4513 000046AF 06                  <1> 	PUSH	ES
  4514 000046B0 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 000046B1 66BB1000            <1> 	mov	bx, KDATA
  4528 000046B5 8EDB                <1> 	mov	ds, bx
  4529 000046B7 8EC3                <1> 	mov	es, bx	; 27/05/2016
  4530                              <1> 	;
  4531 000046B9 80EA80              <1> 	SUB	DL,80H
  4532 000046BC 80FA04              <1> 	CMP	DL,MAX_FILE		; TEST WITHIN RANGE
  4533 000046BF 7361                <1> 	JAE	short G4
  4534                              <1> 	;
  4535 000046C1 31DB                <1> 	xor	ebx, ebx ; 21/02/2015
  4536                              <1> 	; 22/12/2014
  4537 000046C3 88D3                <1> 	mov	bl, dl
  4538                              <1> 	;xor	bh, bh  
  4539 000046C5 C0E302              <1> 	shl	bl, 2			; convert index to offset
  4540                              <1> 	;add	bx, HF_TBL_VEC
  4541 000046C8 81C3[48340100]      <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 000046CE 8B1B                <1> 	mov	ebx, [ebx] ; 32 bit offset	
  4546                              <1> 
  4547 000046D0 C605[43340100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4548                              <1>         ;MOV     AX,[ES:BX]             ; MAX NUMBER OF CYLINDERS
  4549 000046D7 668B03              <1> 	mov	ax, [ebx]
  4550                              <1> 	;;SUB	AX,2			; ADJUST FOR 0-N
  4551 000046DA 6648                <1> 	dec	ax			; max. cylinder number
  4552 000046DC 88C5                <1> 	MOV	CH,AL
  4553 000046DE 66250003            <1> 	AND	AX,0300H		; HIGH TWO BITS OF CYLINDER
  4554 000046E2 66D1E8              <1> 	SHR	AX,1
  4555 000046E5 66D1E8              <1> 	SHR	AX,1
  4556                              <1> 	;OR	AL,[ES:BX+14]		; SECTORS
  4557 000046E8 0A430E              <1> 	or	al, [ebx+14]
  4558 000046EB 88C1                <1> 	MOV	CL,AL
  4559                              <1> 	;MOV	DH,[ES:BX+2]		; HEADS
  4560 000046ED 8A7302              <1> 	mov	dh, [ebx+2]
  4561 000046F0 FECE                <1> 	DEC	DH			; 0-N RANGE
  4562 000046F2 8A15[44340100]      <1> 	MOV	DL,[HF_NUM]		; DRIVE COUNT
  4563 000046F8 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 000046FB 873C24              <1> 	xchg	edi, [esp]		; ebx (input)-> edi, edi -> [esp]
  4572 000046FE 56                  <1> 	push	esi
  4573 000046FF 89DE                <1> 	mov	esi, ebx		; hard disk parameter table (32 bytes)	
  4574 00004701 89FB                <1> 	mov	ebx, edi		; ebx = user's buffer address
  4575 00004703 51                  <1> 	push	ecx
  4576 00004704 50                  <1> 	push	eax
  4577 00004705 B920000000          <1> 	mov	ecx, 32 ; 32 bytes
  4578 0000470A E891990000          <1> 	call	transfer_to_user_buffer ; trdosk6.s (16/05/2016)
  4579 0000470F 58                  <1> 	pop	eax
  4580 00004710 59                  <1> 	pop	ecx
  4581 00004711 5E                  <1> 	pop	esi
  4582 00004712 5F                  <1> 	pop	edi
  4583 00004713 730A                <1> 	jnc	short G5
  4584                              <1> 	; 29/05/2016 (*)
  4585 00004715 B8FF000000          <1> 	mov	eax, 0FFh ; unknown error !
  4586                              <1> _G6:
  4587 0000471A 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 0000471F 07                  <1> 	POP	ES
  4592 00004720 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 00004721 CF                  <1> 	iretd
  4598                              <1> G4:
  4599 00004722 C605[43340100]07    <1> 	MOV     byte [DISK_STATUS1],INIT_FAIL ; OPERATION FAILED
  4600 00004729 B407                <1> 	MOV	AH,INIT_FAIL
  4601 0000472B 28C0                <1> 	SUB	AL,AL
  4602 0000472D 6629D2              <1> 	SUB	DX,DX
  4603 00004730 6629C9              <1> 	SUB	CX,CX
  4604                              <1> 	; 29/05/2016 (*)
  4605                              <1> 	;STC				; SET ERROR FLAG
  4606                              <1> 	;JMP	short G5
  4607 00004733 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 00004735 31C0                <1> 	xor	eax, eax ; 21/02/2015
  4650 00004737 B00B                <1> 	mov	al,11 ; Physical heads from translated HDPT
  4651 00004739 3825[58340100]      <1>         cmp     [LBAMode], ah   ; 0
  4652 0000473F 7702                <1> 	ja	short idrv0
  4653 00004741 B002                <1> 	mov	al,2  ; Physical heads from standard HDPT
  4654                              <1> idrv0:
  4655                              <1> 	; DL = drive number (0 based)
  4656 00004743 E8C6030000          <1> 	call	GET_VEC
  4657                              <1> 	;push	bx
  4658 00004748 53                  <1> 	push	ebx ; 21/02/2015
  4659                              <1> 	;add	bx,ax
  4660 00004749 01C3                <1> 	add	ebx, eax
  4661                              <1> 	;; 05/01/2015
  4662 0000474B 8A25[0CFA0000]      <1> 	mov	ah, [hf_m_s] ; drive number (0= master, 1= slave)
  4663                              <1> 	;;and 	ah,1 
  4664 00004751 C0E404              <1> 	shl	ah,4
  4665 00004754 80CCA0              <1> 	or	ah,0A0h  ; Drive/Head register - 10100000b (A0h)	
  4666                              <1> 	;mov	al,[es:bx]
  4667 00004757 8A03                <1> 	mov	al, [ebx] ; 21/02/2015
  4668 00004759 FEC8                <1> 	dec	al	 ; last head number 
  4669                              <1> 	;and	al,0Fh
  4670 0000475B 08E0                <1> 	or	al,ah	 ; lower 4 bits for head number
  4671                              <1> 	;
  4672 0000475D C645FE91            <1> 	mov	byte [CMD_BLOCK+6],SET_PARM_CMD
  4673 00004761 8845FD              <1> 	mov	[CMD_BLOCK+5],al
  4674                              <1> 	;pop	bx
  4675 00004764 5B                  <1> 	pop	ebx
  4676 00004765 29C0                <1> 	sub	eax, eax ; 21/02/2015
  4677 00004767 B004                <1> 	mov	al,4 ; Physical sec per track from translated HDPT
  4678 00004769 803D[58340100]00    <1> 	cmp	byte [LBAMode], 0
  4679 00004770 7702                <1> 	ja	short idrv1
  4680 00004772 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 00004774 01C3                <1> 	add	ebx, eax ; 21/02/2015
  4685                              <1> 	;mov	al,[es:bx]
  4686                              <1> 			; sector number
  4687 00004776 8A03                <1> 	mov	al, [ebx]
  4688 00004778 8845F9              <1> 	mov	[CMD_BLOCK+1],al
  4689 0000477B 28C0                <1> 	sub	al,al
  4690 0000477D 8845FB              <1> 	mov	[CMD_BLOCK+3],al  ; ZERO FLAGS
  4691 00004780 E8CA010000          <1> 	call	COMMAND 	  ; TELL CONTROLLER
  4692 00004785 750C                <1> 	jnz	short INIT_EXIT	  ; CONTROLLER BUSY ERROR
  4693 00004787 E878020000          <1> 	call	NOT_BUSY	  ; WAIT FOR IT TO BE DONE
  4694 0000478C 7505                <1> 	jnz	short INIT_EXIT	  ; TIME OUT
  4695 0000478E E8C9020000          <1> 	call	CHECK_STATUS
  4696                              <1> INIT_EXIT:
  4697 00004793 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 00004794 C645FE22            <1>         mov     byte [CMD_BLOCK+6],READ_CMD + ECC_MODE 
  4706 00004798 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 0000479D C645FE32            <1>         MOV     byte [CMD_BLOCK+6],WRITE_CMD + ECC_MODE
  4715 000047A1 E932010000          <1>         JMP     COMMANDO
  4716                              <1> 
  4717                              <1> ;----------------------------------------
  4718                              <1> ;	SEEK		     (AH = 0CH) :
  4719                              <1> ;----------------------------------------
  4720                              <1> 
  4721                              <1> DISK_SEEK:
  4722 000047A6 C645FE70            <1>         MOV     byte [CMD_BLOCK+6],SEEK_CMD
  4723 000047AA E8A0010000          <1> 	CALL	COMMAND
  4724 000047AF 751C                <1> 	JNZ	short DS_EXIT 		; CONTROLLER BUSY ERROR
  4725 000047B1 E812020000          <1> 	CALL	_WAIT
  4726 000047B6 7515                <1>         JNZ     DS_EXIT                 ; TIME OUT ON SEEK
  4727 000047B8 E89F020000          <1> 	CALL	CHECK_STATUS
  4728 000047BD 803D[43340100]40    <1>         CMP     byte [DISK_STATUS1],BAD_SEEK
  4729 000047C4 7507                <1> 	JNE	short DS_EXIT
  4730 000047C6 C605[43340100]00    <1>         MOV     byte [DISK_STATUS1],0
  4731                              <1> DS_EXIT:
  4732 000047CD 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 000047CE E831020000          <1> 	CALL	NOT_BUSY
  4740 000047D3 751C                <1> 	JNZ	short TR_EX
  4741 000047D5 8A45FD              <1> 	MOV	AL,[CMD_BLOCK+5] 	; SELECT DRIVE
  4742 000047D8 668B15[08FA0000]    <1> 	MOV	DX,[HF_PORT]
  4743 000047DF 80C206              <1> 	add	dl,6
  4744 000047E2 EE                  <1> 	OUT	DX,AL
  4745 000047E3 E88C020000          <1> 	CALL	CHECK_ST		; CHECK STATUS ONLY
  4746 000047E8 7507                <1> 	JNZ	short TR_EX
  4747 000047EA C605[43340100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; WIPE OUT DATA CORRECTED ERROR
  4748                              <1> TR_EX:	
  4749 000047F1 C3                  <1> 	RETn
  4750                              <1> 
  4751                              <1> ;----------------------------------------
  4752                              <1> ;	RECALIBRATE	     (AH = 11H) :
  4753                              <1> ;----------------------------------------
  4754                              <1> 
  4755                              <1> HDISK_RECAL:
  4756 000047F2 C645FE10            <1>         MOV     byte [CMD_BLOCK+6],RECAL_CMD ; 10h, 16
  4757 000047F6 E854010000          <1> 	CALL	COMMAND 		; START THE OPERATION
  4758 000047FB 7523                <1> 	JNZ	short RECAL_EXIT	; ERROR
  4759 000047FD E8C6010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION
  4760 00004802 7407                <1> 	JZ	short RECAL_X 		; TIME OUT ONE OK ?
  4761 00004804 E8BF010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION LONGER
  4762 00004809 7515                <1> 	JNZ	short RECAL_EXIT	; TIME OUT TWO TIMES IS ERROR
  4763                              <1> RECAL_X:
  4764 0000480B E84C020000          <1> 	CALL	CHECK_STATUS
  4765 00004810 803D[43340100]40    <1> 	CMP	byte [DISK_STATUS1],BAD_SEEK ; SEEK NOT COMPLETE
  4766 00004817 7507                <1> 	JNE	short RECAL_EXIT	; IS OK
  4767 00004819 C605[43340100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4768                              <1> RECAL_EXIT:
  4769 00004820 803D[43340100]00    <1>         CMP     byte [DISK_STATUS1],0
  4770 00004827 C3                  <1> 	RETn
  4771                              <1> 
  4772                              <1> ;----------------------------------------
  4773                              <1> ;      CONTROLLER DIAGNOSTIC (AH = 14H) :
  4774                              <1> ;----------------------------------------
  4775                              <1> 
  4776                              <1> CTLR_DIAGNOSTIC:
  4777 00004828 FA                  <1>         CLI                             ; DISABLE INTERRUPTS WHILE CHANGING MASK
  4778 00004829 E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  4779                              <1> 	;AND	AL,0BFH
  4780 0000482B 243F                <1> 	and	al, 3Fh			; enable IRQ 14 & IRQ 15
  4781                              <1> 	;JMP	$+2
  4782                              <1> 	IODELAY
  4782 0000482D EB00                <2>  jmp short $+2
  4782 0000482F EB00                <2>  jmp short $+2
  4783 00004831 E6A1                <1> 	OUT	INTB01,AL
  4784                              <1> 	IODELAY
  4784 00004833 EB00                <2>  jmp short $+2
  4784 00004835 EB00                <2>  jmp short $+2
  4785 00004837 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  4786 00004839 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  4787                              <1> 	;JMP	$+2
  4788                              <1> 	IODELAY
  4788 0000483B EB00                <2>  jmp short $+2
  4788 0000483D EB00                <2>  jmp short $+2
  4789 0000483F E621                <1> 	OUT	INTA01,AL
  4790 00004841 FB                  <1> 	STI
  4791 00004842 E8BD010000          <1> 	CALL	NOT_BUSY		; WAIT FOR CARD
  4792 00004847 752B                <1> 	JNZ	short CD_ERR		; BAD CARD
  4793                              <1> 	;MOV	DX, HF_PORT+7
  4794 00004849 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  4795 00004850 80C207              <1> 	add	dl, 7
  4796 00004853 B090                <1> 	MOV	AL,DIAG_CMD		; START DIAGNOSE
  4797 00004855 EE                  <1> 	OUT	DX,AL
  4798 00004856 E8A9010000          <1> 	CALL	NOT_BUSY		; WAIT FOR IT TO COMPLETE
  4799 0000485B B480                <1> 	MOV	AH,TIME_OUT
  4800 0000485D 7517                <1> 	JNZ	short CD_EXIT 		; TIME OUT ON DIAGNOSTIC
  4801                              <1> 	;MOV	DX,HF_PORT+1		; GET ERROR REGISTER
  4802 0000485F 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  4803 00004866 FEC2                <1> 	inc	dl
  4804 00004868 EC                  <1> 	IN	AL,DX
  4805 00004869 A2[3A340100]        <1> 	MOV	[HF_ERROR],AL		; SAVE IT
  4806 0000486E B400                <1> 	MOV	AH,0
  4807 00004870 3C01                <1> 	CMP	AL,1			; CHECK FOR ALL OK
  4808 00004872 7402                <1> 	JE	SHORT CD_EXIT
  4809 00004874 B420                <1> CD_ERR: MOV	AH,BAD_CNTLR
  4810                              <1> CD_EXIT:
  4811 00004876 8825[43340100]      <1> 	MOV	[DISK_STATUS1],AH
  4812 0000487C 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 0000487D E862020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4821 00004882 7253                <1> 	JC	short CMD_ABORT
  4822                              <1> 	;MOV	DI,BX
  4823 00004884 89DF                <1> 	mov	edi, ebx ; 21/02/2015
  4824 00004886 E8C4000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4825 0000488B 754A                <1> 	JNZ	short CMD_ABORT
  4826                              <1> CMD_I1:
  4827 0000488D E836010000          <1> 	CALL	_WAIT			; WAIT FOR DATA REQUEST INTERRUPT
  4828 00004892 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 00004894 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015	
  4832                              <1> 	;MOV	DX,HF_PORT
  4833 00004899 668B15[08FA0000]    <1> 	mov	dx,[HF_PORT]
  4834 000048A0 FA                  <1> 	CLI
  4835 000048A1 FC                  <1> 	CLD
  4836 000048A2 F3666D              <1> 	REP	INSW			; GET THE SECTOR
  4837 000048A5 FB                  <1> 	STI
  4838 000048A6 F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL INPUT
  4839 000048AA 7419                <1> 	JZ	short CMD_I3
  4840 000048AC E880010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4841 000048B1 7224                <1> 	JC	short TM_OUT
  4842                              <1> 	;MOV	DX,HF_PORT
  4843 000048B3 668B15[08FA0000]    <1> 	mov	dx,[HF_PORT]
  4844                              <1> 	;MOV	CX,4			; GET ECC BYTES
  4845 000048BA B904000000          <1> 	mov 	ecx, 4 ; mov cx, 4 
  4846 000048BF EC                  <1> CMD_I2: IN	AL,DX
  4847                              <1> 	;MOV	[ES:DI],AL		; GO SLOW FOR BOARD
  4848 000048C0 8807                <1> 	mov 	[edi], al ; 21/02/2015
  4849 000048C2 47                  <1> 	INC	eDI
  4850 000048C3 E2FA                <1> 	LOOP	CMD_I2
  4851                              <1> CMD_I3: 
  4852                              <1> 	; wait for 400 ns
  4853 000048C5 80C207              <1> 	add 	dl, 7
  4854 000048C8 EC                  <1> 	in	al, dx
  4855 000048C9 EC                  <1> 	in	al, dx
  4856 000048CA EC                  <1> 	in	al, dx
  4857                              <1> 	;
  4858 000048CB E88C010000          <1> 	CALL	CHECK_STATUS
  4859 000048D0 7505                <1> 	JNZ	short CMD_ABORT		; ERROR RETURNED
  4860 000048D2 FE4DF9              <1> 	DEC	byte [CMD_BLOCK+1]	; CHECK FOR MORE
  4861                              <1> 	;JNZ	SHORT CMD_I1
  4862 000048D5 75BD                <1> 	jnz	short cmd_i1x ; 18/02/2016
  4863                              <1> CMD_ABORT:
  4864 000048D7 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 000048D8 E807020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4873 000048DD 72F8                <1> 	JC	short CMD_ABORT
  4874 000048DF 89DE                <1> CMD_OF: MOV	eSI,eBX ; 21/02/2015
  4875 000048E1 E869000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4876 000048E6 75EF                <1> 	JNZ	short CMD_ABORT
  4877 000048E8 E844010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4878 000048ED 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 000048EF 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  4886                              <1> 	;push	es
  4887                              <1> 	;pop	ds
  4888                              <1> 	;mov	cx, 256
  4889 000048F6 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015
  4890 000048FB FA                  <1> 	CLI
  4891 000048FC FC                  <1> 	CLD
  4892 000048FD F3666F              <1> 	REP	OUTSW
  4893 00004900 FB                  <1> 	STI
  4894                              <1> 	;POP	DS			; RESTORE DS
  4895 00004901 F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL OUTPUT
  4896 00004905 7419                <1> 	JZ	short CMD_O3
  4897 00004907 E825010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4898 0000490C 72C9                <1> 	JC	short TM_OUT
  4899                              <1> 	;MOV	DX,HF_PORT
  4900 0000490E 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  4901                              <1> 	;MOV	CX,4			; OUTPUT THE ECC BYTES
  4902 00004915 B904000000          <1> 	mov	ecx, 4  ; mov cx, 4
  4903                              <1> CMD_O2: ;MOV	AL,[ES:SI]
  4904 0000491A 8A06                <1> 	mov	al, [esi]
  4905 0000491C EE                  <1> 	OUT	DX,AL
  4906 0000491D 46                  <1> 	INC	eSI
  4907 0000491E E2FA                <1> 	LOOP	CMD_O2
  4908                              <1> CMD_O3:
  4909 00004920 E8A3000000          <1> 	CALL	_WAIT			; WAIT FOR SECTOR COMPLETE INTERRUPT
  4910 00004925 75B0                <1> 	JNZ	short TM_OUT		; ERROR RETURNED
  4911 00004927 E830010000          <1> 	CALL	CHECK_STATUS
  4912 0000492C 75A9                <1> 	JNZ	short CMD_ABORT
  4913 0000492E F605[39340100]08    <1> 	TEST	byte [HF_STATUS],ST_DRQ	; CHECK FOR MORE
  4914 00004935 75B8                <1> 	JNZ	SHORT CMD_O1
  4915                              <1> 	;MOV	DX,HF_PORT+2		; CHECK RESIDUAL SECTOR COUNT
  4916 00004937 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  4917                              <1> 	;add	dl, 2
  4918 0000493E FEC2                <1> 	inc	dl
  4919 00004940 FEC2                <1> 	inc	dl
  4920 00004942 EC                  <1> 	IN	AL,DX			;
  4921 00004943 A8FF                <1> 	TEST	AL,0FFH 		;
  4922 00004945 7407                <1> 	JZ	short CMD_O4			; COUNT = 0  OK
  4923 00004947 C605[43340100]BB    <1> 	MOV	byte [DISK_STATUS1],UNDEF_ERR 
  4924                              <1> 					; OPERATION ABORTED - PARTIAL TRANSFER
  4925                              <1> CMD_O4:
  4926 0000494E 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 0000494F 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 00004950 E879FEFFFF          <1> 	CALL	TST_RDY 		; CHECK DRIVE READY
  4942                              <1> 	;;POP	CX
  4943 00004955 7419                <1> 	JZ	short COMMAND2		; DRIVE IS READY
  4944 00004957 803D[43340100]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 0000495E 7507                <1> 	jne	short COMMAND4
  4949                              <1> CMD_TIMEOUT:
  4950 00004960 C605[43340100]20    <1> 	MOV	byte [DISK_STATUS1],BAD_CNTLR
  4951                              <1> COMMAND4:
  4952 00004967 5B                  <1> 	POP	eBX
  4953 00004968 803D[43340100]00    <1>         CMP     byte [DISK_STATUS1],0   ; SET CONDITION CODE FOR CALLER
  4954 0000496F C3                  <1> 	RETn
  4955                              <1> COMMAND2:
  4956 00004970 5B                  <1> 	POP	eBX
  4957 00004971 57                  <1> 	PUSH	eDI
  4958 00004972 C605[3B340100]00    <1> 	MOV	byte [HF_INT_FLAG],0	; RESET INTERRUPT FLAG
  4959 00004979 FA                  <1> 	CLI				; INHIBIT INTERRUPTS WHILE CHANGING MASK
  4960 0000497A E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  4961                              <1> 	;AND	AL,0BFH
  4962 0000497C 243F                <1> 	and	al, 3Fh			; Enable IRQ 14 & 15
  4963                              <1> 	;JMP	$+2
  4964                              <1> 	IODELAY
  4964 0000497E EB00                <2>  jmp short $+2
  4964 00004980 EB00                <2>  jmp short $+2
  4965 00004982 E6A1                <1> 	OUT	INTB01,AL
  4966 00004984 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  4967 00004986 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  4968                              <1> 	;JMP	$+2
  4969                              <1> 	IODELAY
  4969 00004988 EB00                <2>  jmp short $+2
  4969 0000498A EB00                <2>  jmp short $+2
  4970 0000498C E621                <1> 	OUT	INTA01,AL
  4971 0000498E FB                  <1> 	STI
  4972 0000498F 31FF                <1> 	XOR	eDI,eDI			; INDEX THE COMMAND TABLE
  4973                              <1> 	;MOV	DX,HF_PORT+1		; DISK ADDRESS
  4974 00004991 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  4975 00004998 FEC2                <1> 	inc	dl
  4976 0000499A F605[45340100]C0    <1> 	TEST	byte [CONTROL_BYTE],0C0H ; CHECK FOR RETRY SUPPRESSION
  4977 000049A1 7411                <1> 	JZ	short COMMAND3
  4978 000049A3 8A45FE              <1> 	MOV	AL, [CMD_BLOCK+6] 	; YES-GET OPERATION CODE
  4979 000049A6 24F0                <1> 	AND	AL,0F0H 		; GET RID OF MODIFIERS
  4980 000049A8 3C20                <1> 	CMP	AL,20H			; 20H-40H IS READ, WRITE, VERIFY
  4981 000049AA 7208                <1> 	JB	short COMMAND3
  4982 000049AC 3C40                <1> 	CMP	AL,40H
  4983 000049AE 7704                <1> 	JA	short COMMAND3
  4984 000049B0 804DFE01            <1> 	OR	byte [CMD_BLOCK+6],NO_RETRIES 
  4985                              <1> 					; VALID OPERATION FOR RETRY SUPPRESS
  4986                              <1> COMMAND3:
  4987 000049B4 8A443DF8            <1> 	MOV	AL,[CMD_BLOCK+eDI]	; GET THE COMMAND STRING BYTE
  4988 000049B8 EE                  <1> 	OUT	DX,AL			; GIVE IT TO CONTROLLER
  4989                              <1> 	IODELAY
  4989 000049B9 EB00                <2>  jmp short $+2
  4989 000049BB EB00                <2>  jmp short $+2
  4990 000049BD 47                  <1> 	INC	eDI			; NEXT BYTE IN COMMAND BLOCK
  4991 000049BE 6642                <1> 	INC	DX			; NEXT DISK ADAPTER REGISTER
  4992 000049C0 6683FF07            <1> 	cmp	di, 7	; 1/1/2015	; ALL DONE?
  4993 000049C4 75EE                <1> 	JNZ	short COMMAND3		; NO--GO DO NEXT ONE
  4994 000049C6 5F                  <1> 	POP	eDI
  4995 000049C7 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 000049C8 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 000049C9 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 000049CE F605[3B340100]C0    <1> 	test 	byte [HF_INT_FLAG],0C0h
  5028                              <1> 	;LOOPZ	WT1
  5029 000049D5 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 000049D7 E461                <1> 	in	al, SYS1 ; 61h (PORT_B)	; wait for lo to hi
  5035 000049D9 A810                <1> 	test	al, 10h			; transition on memory
  5036 000049DB 75FA                <1> 	jnz	short WT1_hi		; refresh.
  5037                              <1> WT1_lo:
  5038 000049DD E461                <1> 	in	al, SYS1 		; 061h (PORT_B)	
  5039 000049DF A810                <1> 	test	al, 10h			
  5040 000049E1 74FA                <1> 	jz	short WT1_lo
  5041 000049E3 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 000049E5 C605[43340100]80    <1> WT2:	MOV	byte [DISK_STATUS1],TIME_OUT ; REPORT TIME OUT ERROR
  5050 000049EC EB0E                <1> 	JMP	SHORT WT4
  5051 000049EE C605[43340100]00    <1> WT3:	MOV	byte [DISK_STATUS1],0
  5052 000049F5 C605[3B340100]00    <1> 	MOV	byte [HF_INT_FLAG],0
  5053 000049FC 803D[43340100]00    <1> WT4:	CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5054 00004A03 C3                  <1> 	RETn
  5055                              <1> 
  5056                              <1> ;----------------------------------------
  5057                              <1> ;	WAIT FOR CONTROLLER NOT BUSY	:
  5058                              <1> ;----------------------------------------
  5059                              <1> NOT_BUSY:
  5060 00004A04 FB                  <1> 	STI				; MAKE SURE INTERRUPTS ARE ON
  5061                              <1> 	;PUSH	eBX
  5062                              <1> 	;SUB	CX,CX			; SET INITIAL DELAY BEFORE TEST
  5063 00004A05 668B15[08FA0000]    <1> 	mov	DX, [HF_PORT]
  5064 00004A0C 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 00004A0F 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 00004A14 EC                  <1> 	IN	AL,DX			; CHECK STATUS
  5075                              <1> 	;TEST	AL,ST_BUSY
  5076 00004A15 2480                <1> 	and	al, ST_BUSY
  5077                              <1> 	;LOOPNZ	NB1
  5078 00004A17 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 00004A19 E461                <1> NB1_hi: IN	AL,SYS1			; wait for hi to lo
  5083 00004A1B A810                <1> 	TEST	AL,010H			; transition on memory
  5084 00004A1D 75FA                <1> 	JNZ	SHORT NB1_hi		; refresh.
  5085 00004A1F E461                <1> NB1_lo: IN	AL,SYS1
  5086 00004A21 A810                <1> 	TEST	AL,010H
  5087 00004A23 74FA                <1> 	JZ	short NB1_lo
  5088 00004A25 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 00004A27 B080                <1> 	mov	al, TIME_OUT
  5098                              <1> NB2:	
  5099                              <1> 	;MOV	byte [DISK_STATUS1],0
  5100                              <1> ;NB3:	
  5101                              <1> 	;POP	eBX
  5102 00004A29 A2[43340100]        <1> 	mov	[DISK_STATUS1], al	;;; will be set after return
  5103                              <1> 	;CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5104 00004A2E 08C0                <1> 	or	al, al			; (zf = 0 --> timeout)
  5105 00004A30 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 00004A31 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  5114 00004A38 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 00004A3B B9E8030000          <1> 	mov 	ecx, WAIT_HDU_DRQ_LH ; 21/02/2015 
  5121 00004A40 EC                  <1> WQ_1:	IN	AL,DX			; GET STATUS
  5122 00004A41 A808                <1> 	TEST	AL,ST_DRQ		; WAIT FOR DRQ
  5123 00004A43 7516                <1> 	JNZ	short WQ_OK
  5124                              <1> 	;LOOP	WQ_1			; KEEP TRYING FOR A SHORT WHILE
  5125                              <1> WQ_hi:	
  5126 00004A45 E461                <1> 	IN	AL,SYS1			; wait for hi to lo
  5127 00004A47 A810                <1> 	TEST	AL,010H			; transition on memory
  5128 00004A49 75FA                <1> 	JNZ	SHORT WQ_hi		; refresh.
  5129 00004A4B E461                <1> WQ_lo:  IN      AL,SYS1
  5130 00004A4D A810                <1> 	TEST	AL,010H
  5131 00004A4F 74FA                <1> 	JZ	SHORT WQ_lo
  5132 00004A51 E2ED                <1> 	LOOP	WQ_1
  5133                              <1> 
  5134 00004A53 C605[43340100]80    <1>         MOV     byte [DISK_STATUS1],TIME_OUT ; ERROR
  5135 00004A5A F9                  <1> 	STC
  5136                              <1> WQ_OK:
  5137 00004A5B 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 00004A5C E813000000          <1> 	CALL	CHECK_ST		; CHECK THE STATUS BYTE
  5146 00004A61 7509                <1> 	JNZ	short CHECK_S1		; AN ERROR WAS FOUND
  5147 00004A63 A801                <1> 	TEST	AL,ST_ERROR		; WERE THERE ANY OTHER ERRORS
  5148 00004A65 7405                <1> 	JZ	short CHECK_S1		; NO ERROR REPORTED
  5149 00004A67 E849000000          <1> 	CALL	CHECK_ER		; ERROR REPORTED
  5150                              <1> CHECK_S1:
  5151 00004A6C 803D[43340100]00    <1> 	CMP	byte [DISK_STATUS1],0 	; SET STATUS FOR CALLER
  5152 00004A73 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 00004A74 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]
  5160 00004A7B 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 00004A7E 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 00004A7F E6EB                <2>  out 0ebh,al
  5170                              <1> 	;
  5171 00004A81 A2[39340100]        <1> 	MOV	[HF_STATUS],AL
  5172 00004A86 B400                <1> 	MOV	AH,0
  5173 00004A88 A880                <1> 	TEST	AL,ST_BUSY		; IF STILL BUSY
  5174 00004A8A 751A                <1> 	JNZ	short CKST_EXIT		;  REPORT OK
  5175 00004A8C B4CC                <1> 	MOV	AH,WRITE_FAULT
  5176 00004A8E A820                <1> 	TEST	AL,ST_WRT_FLT		; CHECK FOR WRITE FAULT
  5177 00004A90 7514                <1> 	JNZ	short CKST_EXIT
  5178 00004A92 B4AA                <1> 	MOV	AH,NOT_RDY
  5179 00004A94 A840                <1> 	TEST	AL,ST_READY		; CHECK FOR NOT READY
  5180 00004A96 740E                <1> 	JZ	short CKST_EXIT
  5181 00004A98 B440                <1> 	MOV	AH,BAD_SEEK
  5182 00004A9A A810                <1> 	TEST	AL,ST_SEEK_COMPL	; CHECK FOR SEEK NOT COMPLETE
  5183 00004A9C 7408                <1> 	JZ	short CKST_EXIT
  5184 00004A9E B411                <1> 	MOV	AH,DATA_CORRECTED
  5185 00004AA0 A804                <1> 	TEST	AL,ST_CORRCTD		; CHECK FOR CORRECTED ECC
  5186 00004AA2 7502                <1> 	JNZ	short CKST_EXIT
  5187 00004AA4 B400                <1> 	MOV	AH,0
  5188                              <1> CKST_EXIT:
  5189 00004AA6 8825[43340100]      <1> 	MOV	[DISK_STATUS1],AH	; SET ERROR FLAG
  5190 00004AAC 80FC11              <1> 	CMP	AH,DATA_CORRECTED	; KEEP GOING WITH DATA CORRECTED
  5191 00004AAF 7403                <1> 	JZ	short CKST_EX1
  5192 00004AB1 80FC00              <1> 	CMP	AH,0
  5193                              <1> CKST_EX1:
  5194 00004AB4 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 00004AB5 668B15[08FA0000]    <1> 	mov	dx, [HF_PORT]		;
  5202 00004ABC FEC2                <1> 	inc	dl
  5203 00004ABE EC                  <1> 	IN	AL,DX
  5204 00004ABF A2[3A340100]        <1> 	MOV	[HF_ERROR],AL
  5205 00004AC4 53                  <1> 	PUSH	eBX ; 21/02/2015
  5206 00004AC5 B908000000          <1> 	MOV	eCX,8			; TEST ALL 8 BITS
  5207 00004ACA D0E0                <1> CK1:	SHL	AL,1			; MOVE NEXT ERROR BIT TO CARRY
  5208 00004ACC 7202                <1> 	JC	short CK2		; FOUND THE ERROR
  5209 00004ACE E2FA                <1> 	LOOP	CK1			; KEEP TRYING
  5210 00004AD0 BB[FCF90000]        <1> CK2:	MOV	eBX, ERR_TBL		; COMPUTE ADDRESS OF
  5211 00004AD5 01CB                <1> 	ADD	eBX,eCX			; ERROR CODE
  5212                              <1> 	;;MOV	AH,BYTE [CS:BX]		; GET ERROR CODE
  5213                              <1> 	;mov	ah, [bx]
  5214 00004AD7 8A23                <1> 	mov	ah, [ebx] ; 21/02/2015	
  5215 00004AD9 8825[43340100]      <1> CKEX:	MOV	[DISK_STATUS1],AH	; SAVE ERROR CODE
  5216 00004ADF 5B                  <1> 	POP	eBX
  5217 00004AE0 80FC00              <1> 	CMP	AH,0
  5218 00004AE3 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 00004AE4 6650                <1> 	PUSH	AX			; SAVE REGISTERS
  5231 00004AE6 66B80080            <1> 	MOV	AX,8000H		; AH = MAX # SECTORS AL = MAX OFFSET
  5232 00004AEA F645FE02            <1>         TEST    byte [CMD_BLOCK+6],ECC_MODE
  5233 00004AEE 7404                <1> 	JZ	short CKD1
  5234 00004AF0 66B8047F            <1> 	MOV	AX,7F04H		; ECC IS 4 MORE BYTES
  5235 00004AF4 3A65F9              <1> CKD1:	CMP	AH, [CMD_BLOCK+1] 	; NUMBER OF SECTORS
  5236 00004AF7 7706                <1> 	JA	short CKDOK		; IT WILL FIT
  5237 00004AF9 7208                <1> 	JB	short CKDERR		; TOO MANY
  5238 00004AFB 38D8                <1> 	CMP	AL,BL			; CHECK OFFSET ON MAX SECTORS
  5239 00004AFD 7204                <1> 	JB	short CKDERR		; ERROR
  5240 00004AFF F8                  <1> CKDOK:	CLC				; CLEAR CARRY
  5241 00004B00 6658                <1> 	POP	AX
  5242 00004B02 C3                  <1> 	RETn				; NORMAL RETURN
  5243 00004B03 F9                  <1> CKDERR: STC				; INDICATE ERROR
  5244 00004B04 C605[43340100]09    <1>         MOV     byte [DISK_STATUS1],DMA_BOUNDARY
  5245 00004B0B 6658                <1> 	POP	AX
  5246 00004B0D 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 00004B0E 31DB                <1> 	xor	ebx, ebx
  5267 00004B10 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 00004B12 C0E302              <1> 	shl	bl, 2	;;
  5273                              <1> 	;add	bx, HF_TBL_VEC		; Disk parameter table pointer
  5274 00004B15 81C3[48340100]      <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 00004B1B 8B1B                <1> 	mov	ebx, [ebx]		
  5279                              <1> ;GV_EXIT:
  5280 00004B1D 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 00004B1E 6650                <1> 	PUSH	AX
  5298 00004B20 1E                  <1> 	PUSH	DS
  5299                              <1> 	;CALL	DDS
  5300                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5301 00004B21 66B81000            <1> 	mov	ax, KDATA
  5302 00004B25 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 00004B27 C605[3B340100]FF    <1> 	mov	byte [HF_INT_FLAG], 0FFh
  5307                              <1> 	;
  5308 00004B2E 6652                <1> 	push	dx
  5309 00004B30 66BAF701            <1> 	mov	dx, HDC1_BASEPORT+7	; Status Register (1F7h)
  5310                              <1> 					; Clear Controller
  5311                              <1> Clear_IRQ1415:				; (Award BIOS - 1999)
  5312 00004B34 EC                  <1> 	in	al, dx			;
  5313 00004B35 665A                <1> 	pop	dx
  5314                              <1> 	NEWIODELAY
  5314 00004B37 E6EB                <2>  out 0ebh,al
  5315                              <1> 	;
  5316 00004B39 B020                <1> 	MOV	AL,EOI			; NON-SPECIFIC END OF INTERRUPT
  5317 00004B3B E6A0                <1> 	OUT	INTB00,AL		; FOR CONTROLLER #2
  5318                              <1> 	;JMP	$+2			; WAIT
  5319                              <1> 	NEWIODELAY
  5319 00004B3D E6EB                <2>  out 0ebh,al
  5320 00004B3F E620                <1> 	OUT	INTA00,AL		; FOR CONTROLLER #1
  5321 00004B41 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 00004B42 6658                <1> 	POP	AX
  5327 00004B44 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 00004B45 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 00004B47 B00B                <1> 	mov	al, 0Bh  ; In-Service Register
  5342 00004B49 E6A0                <1> 	out	0A0h, al
  5343 00004B4B EB00                <1>         jmp short $+2
  5344 00004B4D EB00                <1> 	jmp short $+2
  5345 00004B4F E4A0                <1> 	in	al, 0A0h
  5346 00004B51 2480                <1> 	and 	al, 80h ; bit 7 (is it real IRQ 15 or fake?)
  5347 00004B53 74ED                <1> 	jz	short irq15_iret ; Fake (spurious)IRQ, do not send EOI)
  5348                              <1> 	;
  5349 00004B55 1E                  <1> 	PUSH	DS
  5350                              <1> 	;CALL	DDS
  5351                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5352 00004B56 66B81000            <1> 	mov	ax, KDATA
  5353 00004B5A 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 00004B5C 800D[3B340100]C0    <1> 	or	byte [HF_INT_FLAG], 0C0h
  5358                              <1> 	;
  5359 00004B63 6652                <1> 	push	dx
  5360 00004B65 66BA7701            <1> 	mov	dx, HDC2_BASEPORT+7	; Status Register (177h)
  5361                              <1> 					; Clear Controller (Award BIOS 1999)
  5362 00004B69 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 ///
  2150                                  %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: 20/02/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; 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 00004B6B A1[B0330100]        <1> 	mov	eax, [free_pages]
   331 00004B70 21C0                <1> 	and	eax, eax
   332 00004B72 7438                <1> 	jz	short out_of_memory
   333                              <1> 	;
   334 00004B74 53                  <1> 	push	ebx
   335 00004B75 51                  <1> 	push	ecx
   336                              <1> 	;
   337 00004B76 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table offset
   338 00004B7B 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 00004B7D 031D[B4330100]      <1> 	add	ebx, [next_page] ; Free page searching starts from here
   346                              <1> 				 ; next_free_page >> 5
   347 00004B83 030D[B8330100]      <1> 	add	ecx, [last_page] ; Free page searching ends here
   348                              <1> 				 ; (total_pages - 1) >> 5
   349                              <1> al_p_scan:
   350 00004B89 39CB                <1> 	cmp	ebx, ecx
   351 00004B8B 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 00004B8D 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 00004B90 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 00004B92 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 00004B95 EBF2                <1>         jmp     short al_p_scan
   385                              <1> 	;
   386                              <1> al_p_notfound:
   387 00004B97 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   388 00004B9D 890D[B4330100]      <1> 	mov	[next_page], ecx ; next/first free page = last page 
   389                              <1> 				 ; (deallocate_page procedure will change it)
   390 00004BA3 31C0                <1> 	xor	eax, eax
   391 00004BA5 A3[B0330100]        <1> 	mov	[free_pages], eax ; 0
   392 00004BAA 59                  <1> 	pop	ecx
   393 00004BAB 5B                  <1> 	pop	ebx
   394                              <1> 	;
   395                              <1> out_of_memory:
   396 00004BAC E85B040000          <1> 	call	swap_out
   397 00004BB1 7325                <1> 	jnc	short al_p_ok  ; [free_pages] = 0, re-allocation by swap_out
   398                              <1> 	;
   399 00004BB3 29C0                <1> 	sub 	eax, eax ; 0
   400 00004BB5 F9                  <1> 	stc
   401 00004BB6 C3                  <1> 	retn
   402                              <1> 
   403                              <1> al_p_found:
   404 00004BB7 89D9                <1> 	mov	ecx, ebx
   405 00004BB9 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   406 00004BBF 890D[B4330100]      <1> 	mov	[next_page], ecx ; Set first free page searching start
   407                              <1> 				 ; address/offset (to the next)
   408 00004BC5 FF0D[B0330100]      <1>         dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
   409                              <1> 	;
   410 00004BCB 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 00004BCE C1E103              <1> 	shl	ecx, 3		 ; (page block offset * 32) + page index
   418 00004BD1 01C8                <1> 	add	eax, ecx	 ; = page number
   419 00004BD3 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 00004BD6 59                  <1> 	pop	ecx
   425 00004BD7 5B                  <1> 	pop	ebx
   426                              <1> al_p_ok:
   427 00004BD8 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 00004BD9 E88DFFFFFF          <1> 	call	allocate_page
   449 00004BDE 7216                <1> 	jc	short mkpd_error
   450                              <1> 	;
   451 00004BE0 A3[384A0100]        <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 00004BE5 57                  <1> 	push	edi
   465 00004BE6 51                  <1> 	push	ecx
   466 00004BE7 50                  <1> 	push	eax
   467 00004BE8 B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
   468 00004BED 89C7                <1> 	mov	edi, eax
   469 00004BEF 31C0                <1> 	xor	eax, eax
   470 00004BF1 F3AB                <1> 	rep	stosd
   471 00004BF3 58                  <1> 	pop	eax
   472 00004BF4 59                  <1> 	pop	ecx
   473 00004BF5 5F                  <1> 	pop	edi
   474                              <1> mkpd_error:
   475                              <1> mkpt_error:
   476 00004BF6 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 00004BF7 E86FFFFFFF          <1> 	call	allocate_page
   500 00004BFC 72F8                <1> 	jc	short mkpt_error
   501 00004BFE E811000000          <1> 	call	set_pde	
   502 00004C03 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 00004C05 E861FFFFFF          <1> 	call	allocate_page
   523 00004C0A 7207                <1> 	jc	short mkp_err
   524 00004C0C E821000000          <1> 	call	set_pte	
   525 00004C11 73D2                <1> 	jnc	short clear_page ; 18/04/2015
   526                              <1> mkp_err:
   527 00004C13 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 00004C14 89DA                <1> 	mov	edx, ebx
   553 00004C16 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22
   554 00004C19 C1E202              <1> 	shl	edx, 2 ; offset to page directory (1024*4)
   555 00004C1C 0315[384A0100]      <1> 	add	edx, [u.pgdir]
   556                              <1> 	;
   557 00004C22 21C0                <1> 	and	eax, eax
   558 00004C24 7506                <1> 	jnz	short spde_1
   559                              <1> 	;
   560 00004C26 8B02                <1> 	mov	eax, [edx]  ; old PDE value
   561                              <1> 	;test	al, 1
   562                              <1> 	;jz	short spde_2
   563 00004C28 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h  ; clear lower 12 bits
   564                              <1> spde_1:
   565                              <1> 	;and	cx, 0FFFh
   566 00004C2C 8902                <1> 	mov	[edx], eax
   567 00004C2E 66090A              <1> 	or	[edx], cx
   568 00004C31 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 00004C32 50                  <1> 	push	eax
   599 00004C33 A1[384A0100]        <1> 	mov	eax, [u.pgdir] ; 20/07/2015
   600 00004C38 E837000000          <1> 	call 	get_pde
   601                              <1> 		; EDX = PDE address
   602                              <1> 		; EAX = PDE value
   603 00004C3D 5A                  <1> 	pop	edx ; physical page address
   604 00004C3E 722A                <1> 	jc	short spte_err ; PDE not present
   605                              <1> 	;
   606 00004C40 53                  <1> 	push	ebx ; 24/07/2015
   607 00004C41 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   608                              <1> 			    ; EDX = PT address (physical)	
   609 00004C45 C1EB0C              <1> 	shr	ebx, PAGE_SHIFT ; 12
   610 00004C48 81E3FF030000        <1> 	and	ebx, PTE_MASK	; 03FFh
   611                              <1> 			 ; clear higher 10 bits (PD bits)
   612 00004C4E C1E302              <1> 	shl	ebx, 2   ; offset to page table (1024*4)
   613 00004C51 01C3                <1> 	add	ebx, eax
   614                              <1> 	;
   615 00004C53 8B03                <1> 	mov	eax, [ebx] ; Old PTE value
   616 00004C55 A801                <1> 	test	al, 1
   617 00004C57 740C                <1> 	jz	short spte_0
   618 00004C59 09D2                <1> 	or	edx, edx
   619 00004C5B 750F                <1> 	jnz	short spte_1
   620 00004C5D 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 bits
   621 00004C61 89C2                <1> 	mov	edx, eax
   622 00004C63 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 00004C65 21C0                <1> 	and	eax, eax
   628 00004C67 7403                <1> 	jz	short spte_1
   629                              <1> 	; 24/07/2015
   630                              <1> 	; swapped page ! (on disk)
   631 00004C69 5B                  <1> 	pop	ebx
   632                              <1> spte_err:
   633 00004C6A F9                  <1> 	stc
   634 00004C6B C3                  <1> 	retn
   635                              <1> spte_1: 
   636 00004C6C 89D0                <1> 	mov	eax, edx
   637                              <1> spte_2:
   638 00004C6E 09CA                <1> 	or	edx, ecx
   639                              <1> 	; 23/06/2015
   640 00004C70 8913                <1> 	mov	[ebx], edx ; PTE value in EDX
   641                              <1> 	; 24/07/2015
   642 00004C72 5B                  <1> 	pop	ebx
   643 00004C73 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 00004C74 89DA                <1> 	mov	edx, ebx
   661 00004C76 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22  (12+10)
   662 00004C79 C1E202              <1> 	shl 	edx, 2 ; offset to page directory (1024*4)
   663 00004C7C 01C2                <1> 	add	edx, eax ; page directory address (physical)
   664 00004C7E 8B02                <1> 	mov	eax, [edx]
   665 00004C80 A801                <1> 	test	al, PDE_A_PRESENT ; page table is present or not !
   666 00004C82 751F                <1> 	jnz	short gpte_retn
   667 00004C84 F9                  <1> 	stc
   668                              <1> gpde_retn:	
   669 00004C85 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 00004C86 E8E9FFFFFF          <1> 	call 	get_pde
   691 00004C8B 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 00004C8D 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   696 00004C91 89DA                <1> 	mov	edx, ebx
   697 00004C93 C1EA0C              <1> 	shr	edx, PAGE_SHIFT ; 12
   698 00004C96 81E2FF030000        <1> 	and	edx, PTE_MASK	; 03FFh
   699                              <1> 			 ; clear higher 10 bits (PD bits)
   700 00004C9C C1E202              <1> 	shl	edx, 2 ; offset from start of page table (1024*4)
   701 00004C9F 01C2                <1> 	add	edx, eax
   702 00004CA1 8B02                <1> 	mov	eax, [edx]
   703                              <1> gpte_retn:
   704 00004CA3 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 00004CA4 56                  <1> 	push	esi
   727 00004CA5 51                  <1> 	push	ecx
   728 00004CA6 50                  <1> 	push	eax
   729 00004CA7 89C6                <1> 	mov	esi, eax 
   730 00004CA9 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 00004CAB 890E                <1> 	mov	[esi], ecx ; 0 ; clear PDE 0
   734                              <1> dapd_0:
   735 00004CAD AD                  <1> 	lodsd
   736 00004CAE A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
   737 00004CB0 7409                <1> 	jz	short dapd_1	
   738 00004CB2 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
   739 00004CB6 E812000000          <1> 	call	deallocate_page_table			
   740                              <1> dapd_1:
   741 00004CBB 41                  <1> 	inc	ecx ; page directory entry index
   742 00004CBC 81F900040000        <1> 	cmp	ecx, PAGE_SIZE / 4 ; 1024
   743 00004CC2 72E9                <1> 	jb	short dapd_0
   744                              <1> dapd_2:
   745 00004CC4 58                  <1> 	pop	eax
   746 00004CC5 E87F000000          <1> 	call	deallocate_page	; deallocate the page dir's itself
   747 00004CCA 59                  <1> 	pop	ecx
   748 00004CCB 5E                  <1> 	pop	esi
   749 00004CCC 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 00004CCD 56                  <1> 	push	esi
   774 00004CCE 57                  <1> 	push	edi
   775 00004CCF 52                  <1> 	push	edx
   776 00004CD0 50                  <1> 	push	eax ; *
   777 00004CD1 89C6                <1> 	mov	esi, eax 
   778 00004CD3 31FF                <1> 	xor	edi, edi ; 0
   779                              <1> dapt_0:
   780 00004CD5 AD                  <1> 	lodsd
   781 00004CD6 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
   782 00004CD8 7441                <1> 	jz	short dapt_1
   783                              <1> 	;
   784 00004CDA A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
   785                              <1> 				  ; (must be 1)
   786 00004CDC 754C                <1> 	jnz	short dapt_3
   787                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
   788 00004CDE 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
   789                              <1> 				   ; as child's page ?
   790 00004CE2 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 00004CE4 53                  <1> 	push	ebx
   794 00004CE5 51                  <1> 	push	ecx
   795 00004CE6 66C1E102            <1> 	shl	cx, 2 ; *4 
   796 00004CEA 01CB                <1> 	add	ebx, ecx ; PDE offset (for the parent)
   797 00004CEC 8B0B                <1> 	mov	ecx, [ebx]
   798 00004CEE F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
   799 00004CF1 7435                <1> 	jz	short dapt_2	; parent process does not use this page
   800 00004CF3 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
   801                              <1> 	; EDI = page table entry index (0-1023)
   802 00004CF8 89FA                <1> 	mov	edx, edi 
   803 00004CFA 66C1E202            <1> 	shl	dx, 2 ; *4 
   804 00004CFE 01CA                <1> 	add	edx, ecx ; PTE offset (for the parent)
   805 00004D00 8B1A                <1> 	mov	ebx, [edx]
   806 00004D02 F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
   807 00004D05 7421                <1> 	jz	short dapt_2	; parent process does not use this page
   808 00004D07 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
   809 00004D0B 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
   810 00004D10 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
   811 00004D12 7514                <1> 	jne	short dapt_2	; not same page
   812                              <1> 				; deallocate the child's page
   813 00004D14 800A02              <1>         or      byte [edx], PTE_A_WRITE ; convert to writable page (parent)
   814 00004D17 59                  <1> 	pop	ecx
   815 00004D18 5B                  <1> 	pop	ebx
   816 00004D19 EB1A                <1> 	jmp	short dapt_4
   817                              <1> dapt_1:
   818 00004D1B 09C0                <1> 	or	eax, eax	; swapped page ?
   819 00004D1D 741D                <1> 	jz	short dapt_5	; no
   820                              <1> 				; yes
   821 00004D1F D1E8                <1> 	shr	eax, 1
   822 00004D21 E8CD040000          <1> 	call	unlink_swap_block ; Deallocate swapped page block
   823                              <1> 				  ; on the swap disk (or in file)
   824 00004D26 EB14                <1> 	jmp	short dapt_5
   825                              <1> dapt_2:
   826 00004D28 59                  <1> 	pop	ecx
   827 00004D29 5B                  <1> 	pop	ebx
   828                              <1> dapt_3:	
   829                              <1> 	; 12/07/2016
   830 00004D2A 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
   831 00004D2E 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 00004D30 E814000000          <1> 	call	deallocate_page ; set the mem allocation bit of this page
   835                              <1> dapt_4:
   836 00004D35 C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
   837                              <1> dapt_5:
   838 00004D3C 47                  <1> 	inc	edi ; page table entry index
   839 00004D3D 81FF00040000        <1> 	cmp	edi, PAGE_SIZE / 4 ; 1024
   840 00004D43 7290                <1> 	jb	short dapt_0
   841                              <1> 	;
   842 00004D45 58                  <1> 	pop	eax ; *
   843 00004D46 5A                  <1> 	pop	edx
   844 00004D47 5F                  <1> 	pop	edi	
   845 00004D48 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 00004D49 53                  <1> 	push	ebx
   868 00004D4A 52                  <1> 	push	edx
   869                              <1> 	;
   870 00004D4B C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; shift physical address to 
   871                              <1> 				     ; 12 bits right
   872                              <1> 				     ; to get page number
   873 00004D4E 89C2                <1> 	mov	edx, eax
   874                              <1> 	; 15/09/2015
   875 00004D50 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 00004D53 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
   879                              <1> 				     ; (to get 32 bit position)			
   880                              <1> 	;
   881 00004D56 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address
   882 00004D5B 01D3                <1> 	add	ebx, edx
   883 00004D5D 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
   884                              <1> 				     ; (allocation bit position)	 
   885 00004D60 3B15[B4330100]      <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 00004D66 7306                <1> 	jnb	short dap_1	     ; no	
   889 00004D68 8915[B4330100]      <1> 	mov	[next_page], edx     ; yes
   890                              <1> dap_1:
   891 00004D6E 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 00004D71 FF05[B0330100]      <1>         inc     dword [free_pages]
   899                              <1> dap_2:
   900 00004D77 5A                  <1> 	pop	edx
   901 00004D78 5B                  <1> 	pop	ebx
   902 00004D79 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 00004D7A E8ECFDFFFF          <1> 	call	allocate_page
   986 00004D7F 723E                <1> 	jc	short dpd_err
   987                              <1> 	;
   988 00004D81 55                  <1> 	push	ebp ; 20/07/2015
   989 00004D82 56                  <1> 	push	esi
   990 00004D83 57                  <1> 	push	edi
   991 00004D84 53                  <1> 	push	ebx
   992 00004D85 51                  <1> 	push	ecx
   993 00004D86 8B35[384A0100]      <1> 	mov	esi, [u.pgdir]
   994 00004D8C 89C7                <1> 	mov	edi, eax
   995 00004D8E 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 00004D8F A5                  <1> 	movsd
  1000 00004D90 BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  1001 00004D95 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  1002                              <1> dpd_0:	
  1003 00004D9A AD                  <1> 	lodsd
  1004                              <1> 	;or	eax, eax
  1005                              <1>         ;jnz     short dpd_1
  1006 00004D9B A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  1007 00004D9D 7508                <1> 	jnz	short dpd_1
  1008                              <1>  	; 20/07/2015 (virtual address at the end of the page table)	
  1009 00004D9F 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  1010 00004DA5 EB0F                <1> 	jmp	short dpd_2
  1011                              <1> dpd_1:	
  1012 00004DA7 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  1013 00004DAB 89C3                <1> 	mov	ebx, eax
  1014                              <1> 	; EBX = Parent's page table address
  1015 00004DAD E81F000000          <1> 	call	duplicate_page_table
  1016 00004DB2 720C                <1> 	jc	short dpd_p_err
  1017                              <1> 	; EAX = Child's page table address
  1018 00004DB4 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 00004DB6 AB                  <1> 	stosd
  1023 00004DB7 E2E1                <1> 	loop	dpd_0
  1024                              <1> 	;
  1025 00004DB9 58                  <1> 	pop	eax  ; restore child's page directory address
  1026                              <1> dpd_3:
  1027 00004DBA 59                  <1> 	pop	ecx
  1028 00004DBB 5B                  <1> 	pop	ebx
  1029 00004DBC 5F                  <1> 	pop	edi
  1030 00004DBD 5E                  <1> 	pop	esi
  1031 00004DBE 5D                  <1> 	pop	ebp ; 20/07/2015
  1032                              <1> dpd_err:
  1033 00004DBF C3                  <1> 	retn
  1034                              <1> dpd_p_err:
  1035                              <1> 	; release the allocated pages missing (recover free space)
  1036 00004DC0 58                  <1> 	pop	eax  ; the new page directory address (physical)
  1037 00004DC1 8B1D[384A0100]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  1038 00004DC7 E8D8FEFFFF          <1> 	call 	deallocate_page_dir
  1039 00004DCC 29C0                <1> 	sub	eax, eax ; 0
  1040 00004DCE F9                  <1> 	stc
  1041 00004DCF 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 00004DD1 E895FDFFFF          <1> 	call	allocate_page
  1070 00004DD6 726A                <1> 	jc	short dpt_err
  1071                              <1> 	;
  1072 00004DD8 50                  <1> 	push	eax ; *
  1073 00004DD9 56                  <1> 	push	esi
  1074 00004DDA 57                  <1> 	push	edi
  1075 00004DDB 52                  <1> 	push	edx
  1076 00004DDC 51                  <1> 	push	ecx
  1077                              <1> 	;
  1078 00004DDD 89DE                <1> 	mov	esi, ebx
  1079 00004DDF 89C7                <1> 	mov	edi, eax
  1080 00004DE1 89C2                <1> 	mov	edx, eax
  1081 00004DE3 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  1082                              <1> dpt_0:
  1083 00004DE9 AD                  <1> 	lodsd
  1084 00004DEA 21C0                <1> 	and	eax, eax
  1085 00004DEC 7444                <1> 	jz	short dpt_3
  1086 00004DEE A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  1087 00004DF0 7507                <1> 	jnz	short dpt_1
  1088                              <1> 	; 20/07/2015
  1089                              <1> 	; ebp = virtual (linear) address of the memory page
  1090 00004DF2 E82A050000          <1> 	call	reload_page ; 28/04/2015
  1091 00004DF7 7244                <1> 	jc	short dpt_p_err
  1092                              <1> dpt_1:
  1093                              <1> 	; 21/09/2015
  1094 00004DF9 89C1                <1> 	mov	ecx, eax
  1095 00004DFB 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1096 00004DFF F6C102              <1> 	test	cl, PTE_A_WRITE ; writable page ?
  1097 00004E02 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 00004E04 E862FDFFFF          <1> 	call	allocate_page
  1102 00004E09 7232                <1> 	jc	short dpt_p_err
  1103 00004E0B 57                  <1> 	push	edi
  1104 00004E0C 56                  <1> 	push	esi
  1105 00004E0D 89CE                <1> 	mov	esi, ecx
  1106 00004E0F 89C7                <1> 	mov	edi, eax
  1107 00004E11 B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  1108 00004E16 F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  1109 00004E18 5E                  <1> 	pop	esi
  1110 00004E19 5F                  <1> 	pop	edi
  1111                              <1> 	; 
  1112 00004E1A 53                  <1> 	push	ebx
  1113 00004E1B 50                  <1> 	push	eax
  1114                              <1> 	; 20/07/2015
  1115 00004E1C 89EB                <1> 	mov	ebx, ebp
  1116                              <1> 	; ebx = virtual (linear) address of the memory page
  1117 00004E1E E88A030000          <1> 	call	add_to_swap_queue
  1118 00004E23 58                  <1> 	pop	eax
  1119 00004E24 5B                  <1> 	pop	ebx
  1120                              <1> 	; 21/09/2015
  1121 00004E25 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  1122                              <1> 		; user + writable + present page
  1123 00004E27 EB09                <1> 	jmp	short dpt_3
  1124                              <1> dpt_2:
  1125                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  1126 00004E29 0C05                <1> 	or	al, PTE_A_USER+PTE_A_PRESENT 
  1127                              <1> 		    ; (read only page!)
  1128 00004E2B 8946FC              <1> 	mov	[esi-4], eax ; update parent's PTE
  1129 00004E2E 660D0002            <1> 	or      ax, PTE_DUPLICATED  ; (read only page & duplicated PTE!)
  1130                              <1> dpt_3:
  1131 00004E32 AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  1132                              <1> 	;
  1133 00004E33 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  1134                              <1> 	;
  1135 00004E39 39D7                <1> 	cmp	edi, edx
  1136 00004E3B 72AC                <1> 	jb	short dpt_0
  1137                              <1> dpt_p_err:
  1138 00004E3D 59                  <1> 	pop	ecx
  1139 00004E3E 5A                  <1> 	pop	edx
  1140 00004E3F 5F                  <1> 	pop	edi
  1141 00004E40 5E                  <1> 	pop	esi
  1142 00004E41 58                  <1> 	pop	eax ; *
  1143                              <1> dpt_err:
  1144 00004E42 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 00004E43 53                  <1> 	push	ebx
  1287 00004E44 52                  <1> 	push	edx
  1288 00004E45 51                  <1> 	push	ecx
  1289                              <1> 	;
  1290                              <1> 	; 21/09/2015 (debugging)
  1291 00004E46 FF05[4C4A0100]      <1> 	inc	dword [u.pfcount] ; page fault count for running process
  1292 00004E4C FF05[9C4B0100]      <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 00004E52 8A15[944B0100]      <1> 	mov	dl, [error_code]
  1296                              <1> 	;
  1297 00004E58 F6C201              <1> 	test	dl, 1	; page fault was caused by a non-present page
  1298                              <1> 			; sign
  1299 00004E5B 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 00004E5D F6C202              <1> 	test	dl, 2	; page fault was caused by a page write
  1322                              <1> 			; sign
  1323 00004E60 0F84AB000000        <1>         jz      pfh_p_err
  1324                              <1> 	; 31/08/2015
  1325 00004E66 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 00004E69 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 00004E6F 0F20D3              <1> 	mov	ebx, cr2 ; CR2 contains the linear address 
  1333                              <1> 			 ; which has caused to page fault
  1334 00004E72 E8A2000000          <1> 	call 	copy_page
  1335 00004E77 0F828D000000        <1>         jc      pfh_im_err ; insufficient memory
  1336                              <1> 	;
  1337 00004E7D EB7D                <1>         jmp     pfh_cpp_ok
  1338                              <1> 	;
  1339                              <1> pfh_alloc_np:
  1340 00004E7F E8E7FCFFFF          <1> 	call	allocate_page	; (allocate a new page)
  1341 00004E84 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 00004E8A 80E204              <1> 	and	dl, 4	; CPL = 3 ?
  1347 00004E8D 7505                <1> 	jnz	short pfh_um
  1348                              <1> 			; Page fault handler for kernel/system mode (CPL=0)		
  1349 00004E8F 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 00004E92 EB06                <1> 	jmp	short pfh_get_pde
  1354                              <1> 	;
  1355                              <1> pfh_um:			; Page fault handler for user/appl. mode (CPL=3)
  1356 00004E94 8B1D[384A0100]      <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 00004E9A 80CA03              <1> 	or	dl, 3	; USER + WRITE + PRESENT or SYSTEM + WRITE + PRESENT
  1361 00004E9D 0F20D1              <1> 	mov	ecx, cr2 ; CR2 contains the virtual address 
  1362                              <1> 			 ; which has been caused to page fault
  1363                              <1> 			 ;
  1364 00004EA0 C1E914              <1> 	shr	ecx, 20	 ; shift 20 bits right
  1365 00004EA3 80E1FC              <1> 	and	cl, 0FCh ; mask lower 2 bits to get PDE offset		
  1366                              <1> 	;
  1367 00004EA6 01CB                <1> 	add	ebx, ecx ; now, EBX points to the relevant page dir entry 
  1368 00004EA8 8B0B                <1> 	mov	ecx, [ebx] ; physical (base) address of the page table 	
  1369 00004EAA F6C101              <1> 	test	cl, 1	 ; check bit 0 is set (1) or not (0).
  1370 00004EAD 740B                <1> 	jz	short pfh_set_pde ; Page directory entry is not valid,
  1371                              <1> 			  	  ; set/validate page directory entry
  1372 00004EAF 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  1373 00004EB4 89CB                <1> 	mov	ebx, ecx ; Physical address of the page table
  1374 00004EB6 89C1                <1> 	mov	ecx, eax ; new page address (physical) 	
  1375 00004EB8 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 00004EBA 08D0                <1> 	or	al, dl	 ; lower 3 bits are used as U/S, R/W, P flags
  1381 00004EBC 8903                <1> 	mov	[ebx], eax ; Let's put the new page directory entry here !
  1382 00004EBE 30C0                <1> 	xor	al, al	 ; clear lower (3..8) bits
  1383 00004EC0 89C3                <1> 	mov	ebx, eax
  1384 00004EC2 E8A4FCFFFF          <1> 	call	allocate_page	 ; (allocate a new page)
  1385 00004EC7 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 00004EC9 89C1                <1> 	mov	ecx, eax
  1389 00004ECB E815FDFFFF          <1> 	call	clear_page ; Clear page content
  1390                              <1> pfh_get_pte:
  1391 00004ED0 0F20D0              <1> 	mov	eax, cr2 ; virtual address
  1392                              <1> 			 ; which has been caused to page fault
  1393 00004ED3 89C7                <1> 	mov	edi, eax ; 20/07/2015
  1394 00004ED5 C1E80C              <1> 	shr	eax, 12	 ; shift 12 bit right to get 
  1395                              <1> 			 ; higher 20 bits of the page fault address 
  1396 00004ED8 25FF030000          <1> 	and	eax, 3FFh ; mask PDE# bits, the result is PTE# (0 to 1023)
  1397 00004EDD C1E002              <1> 	shl	eax, 2	; shift 2 bits left to get PTE offset
  1398 00004EE0 01C3                <1> 	add	ebx, eax ; now, EBX points to the relevant page table entry 
  1399 00004EE2 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 00004EE4 21C0                <1> 	and	eax, eax
  1402 00004EE6 7410                <1> 	jz	short pfh_gpte_1
  1403                              <1> 	; 20/07/2015
  1404 00004EE8 87D9                <1> 	xchg	ebx, ecx ; new page address (physical)
  1405 00004EEA 55                  <1> 	push	ebp ; 20/07/2015
  1406 00004EEB 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 00004EEE E8B7000000          <1> 	call	swap_in
  1412 00004EF3 5D                  <1> 	pop	ebp
  1413 00004EF4 7210                <1> 	jc      short pfh_err_retn
  1414 00004EF6 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 00004EF8 08D1                <1> 	or	cl, dl	; lower 3 bits are used as U/S, R/W, P flags
  1419 00004EFA 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 00004EFC 0F20D3              <1> 	mov	ebx, cr2
  1423 00004EFF E8A9020000          <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 00004F04 31C0                <1> 	xor	eax, eax  ; 0
  1432                              <1> 	;
  1433                              <1> pfh_err_retn:
  1434 00004F06 59                  <1> 	pop	ecx
  1435 00004F07 5A                  <1> 	pop	edx
  1436 00004F08 5B                  <1> 	pop	ebx
  1437 00004F09 C3                  <1> 	retn 
  1438                              <1> 	
  1439                              <1> pfh_im_err:
  1440 00004F0A 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 00004F0F 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 00004F11 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 00004F16 F9                  <1> 	stc
  1453 00004F17 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 00004F19 56                  <1> 	push	esi
  1483 00004F1A 57                  <1> 	push	edi
  1484                              <1> 	;push	ebx
  1485                              <1> 	;push	ecx
  1486 00004F1B 31F6                <1> 	xor 	esi, esi
  1487 00004F1D C1EB0C              <1> 	shr	ebx, 12 ; shift 12 bits right to get PDE & PTE numbers
  1488 00004F20 89D9                <1> 	mov	ecx, ebx ; save page fault address (as 12 bit shifted)
  1489 00004F22 C1EB08              <1> 	shr	ebx, 8	 ; shift 8 bits right and then
  1490 00004F25 80E3FC              <1> 	and	bl, 0FCh ; mask lower 2 bits to get PDE offset	
  1491 00004F28 89DF                <1> 	mov 	edi, ebx ; save it for the parent of current process
  1492 00004F2A 031D[384A0100]      <1> 	add	ebx, [u.pgdir] ; EBX points to the relevant page dir entry 
  1493 00004F30 8B03                <1> 	mov	eax, [ebx] ; physical (base) address of the page table
  1494 00004F32 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits 	
  1495 00004F36 89CB                <1> 	mov	ebx, ecx   ; (restore higher 20 bits of page fault address)
  1496 00004F38 81E3FF030000        <1> 	and	ebx, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1497 00004F3E 66C1E302            <1> 	shl	bx, 2	   ; shift 2 bits left to get PTE offset
  1498 00004F42 01C3                <1> 	add	ebx, eax   ; EBX points to the relevant page table entry 
  1499                              <1> 	; 07/09/2015
  1500 00004F44 66F7030002          <1>         test    word [ebx], PTE_DUPLICATED ; (Does current process share this
  1501                              <1> 				     ; read only page as a child process?)	
  1502 00004F49 7509                <1> 	jnz	short cpp_0 ; yes
  1503 00004F4B 8B0B                <1> 	mov	ecx, [ebx] ; PTE value
  1504 00004F4D 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h  ; clear page attributes
  1505 00004F52 EB32                <1> 	jmp	short cpp_1
  1506                              <1> cpp_0:
  1507 00004F54 89FE                <1> 	mov	esi, edi
  1508 00004F56 0335[3C4A0100]      <1> 	add	esi, [u.ppgdir] ; the parent's page directory entry
  1509 00004F5C 8B06                <1> 	mov	eax, [esi] ; physical (base) address of the page table
  1510 00004F5E 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1511 00004F62 89CE                <1> 	mov	esi, ecx   ; (restore higher 20 bits of page fault address)	
  1512 00004F64 81E6FF030000        <1> 	and	esi, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1513 00004F6A 66C1E602            <1> 	shl	si, 2	   ; shift 2 bits left to get PTE offset
  1514 00004F6E 01C6                <1> 	add	esi, eax   ; EDX points to the relevant page table entry  	
  1515 00004F70 8B0E                <1> 	mov	ecx, [esi] ; PTE value of the parent process
  1516                              <1> 	; 21/09/2015
  1517 00004F72 8B03                <1> 	mov	eax, [ebx] ; PTE value of the child process
  1518 00004F74 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear page attributes	
  1519                              <1> 	;
  1520 00004F78 F6C101              <1> 	test	cl, PTE_A_PRESENT ; is it a present/valid page ?
  1521 00004F7B 7424                <1> 	jz	short cpp_3 ; the parent's page is not same page  	
  1522                              <1> 	;
  1523 00004F7D 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h ; clear page attributes
  1524 00004F82 39C8                <1> 	cmp	eax, ecx   ; Same page?	
  1525 00004F84 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 00004F86 E8E0FBFFFF          <1> 	call	allocate_page
  1529 00004F8B 721A                <1> 	jc	short cpp_4 ; 'insufficient memory' error
  1530 00004F8D 21F6                <1> 	and	esi, esi    ; check ESI is valid or not
  1531 00004F8F 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 00004F91 890E                <1> 	mov	[esi], ecx
  1537 00004F93 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 00004F96 89C7                <1> 	mov	edi, eax ; new page address of the child process
  1541                              <1> 	; 07/09/2015
  1542 00004F98 89CE                <1> 	mov	esi, ecx ; the page address of the parent process
  1543 00004F9A B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
  1544 00004F9F F3A5                <1> 	rep	movsd ; 31/08/2015
  1545                              <1> cpp_3:		
  1546 00004FA1 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER ; 1+2+4 = 7
  1547 00004FA3 8903                <1> 	mov	[ebx], eax ; Update PTE
  1548 00004FA5 28C0                <1> 	sub	al, al ; clear attributes
  1549                              <1> cpp_4:
  1550                              <1> 	;pop	ecx
  1551                              <1> 	;pop	ebx
  1552 00004FA7 5F                  <1> 	pop	edi
  1553 00004FA8 5E                  <1> 	pop	esi
  1554 00004FA9 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 00004FAA 833D[7E4B0100]00    <1>         cmp     dword [swp_drv], 0
  1744 00004FB1 7646                <1> 	jna	short swpin_dnp_err
  1745                              <1> 
  1746 00004FB3 3B05[824B0100]      <1> 	cmp	eax, [swpd_size]
  1747 00004FB9 734A                <1> 	jnb	short swpin_snp_err
  1748                              <1> 
  1749 00004FBB 56                  <1> 	push	esi
  1750 00004FBC 53                  <1> 	push	ebx
  1751 00004FBD 51                  <1> 	push	ecx
  1752 00004FBE 8B35[7E4B0100]      <1> 	mov	esi, [swp_drv]	
  1753 00004FC4 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 00004FC9 50                  <1> 	push	eax
  1764 00004FCA E8B2020000          <1> 	call	logical_disk_read
  1765 00004FCF 58                  <1> 	pop	eax
  1766 00004FD0 730C                <1> 	jnc	short swpin_read_ok
  1767                              <1> 	;
  1768 00004FD2 B828000000          <1> 	mov	eax, SWP_DISK_READ_ERR ; drive not ready or read error
  1769 00004FD7 A3[484A0100]        <1> 	mov	[u.error], eax
  1770 00004FDC EB17                <1> 	jmp	short swpin_retn
  1771                              <1> 	;
  1772                              <1> swpin_read_ok:
  1773                              <1> 	; EAX = Offset address (logical sector number)
  1774 00004FDE E810020000          <1> 	call	unlink_swap_block  ; Deallocate swap block	
  1775                              <1> 	;
  1776                              <1> 	; EBX = Memory page (buffer) address (physical!)
  1777                              <1> 	; 20/07/2015
  1778 00004FE3 89EB                <1> 	mov	ebx, ebp ; virtual address (page fault address)
  1779 00004FE5 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  1780 00004FEA 8A1D[334A0100]      <1> 	mov	bl, [u.uno] ; current process number
  1781                              <1> 	; EBX = Virtual (Linear) address & process number combination
  1782 00004FF0 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 00004FF5 59                  <1> 	pop	ecx
  1788 00004FF6 5B                  <1> 	pop	ebx
  1789 00004FF7 5E                  <1> 	pop	esi
  1790 00004FF8 C3                  <1> 	retn
  1791                              <1> 
  1792                              <1> swpin_dnp_err:
  1793 00004FF9 B829000000          <1> 	mov	eax, SWP_DISK_NOT_PRESENT_ERR
  1794                              <1> swpin_err_retn:
  1795 00004FFE A3[484A0100]        <1> 	mov	[u.error], eax
  1796 00005003 F9                  <1> 	stc
  1797 00005004 C3                  <1> 	retn
  1798                              <1> 
  1799                              <1> swpin_snp_err:
  1800 00005005 B82A000000          <1> 	mov	eax, SWP_SECTOR_NOT_PRESENT_ERR
  1801 0000500A 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 0000500C 66833D[7C4B0100]01  <1> 	cmp 	word [swpq_count], 1
  1826 00005014 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 0000501A 833D[864B0100]01    <1>         cmp     dword [swpd_free], 1
  1832 00005021 0F828F000000        <1>         jc      swpout_nfspc_err ; 'no free space on swap disk'
  1833                              <1> 
  1834 00005027 53                  <1> 	push	ebx ; *
  1835                              <1> swpout_1:
  1836                              <1> 	; 10/06/2016
  1837 00005028 31DB                <1> 	xor	ebx, ebx ; shift the queue and return a PTE value
  1838 0000502A E8A1000000          <1> 	call	swap_queue_shift
  1839 0000502F 21C0                <1> 	and	eax, eax	; 0 = empty queue (improper entries)
  1840 00005031 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 00005037 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 0000503B 52                  <1> 	push	edx ; **
  1852                              <1> 
  1853                              <1> 	; 07/06/2016
  1854 0000503C 803D[3F410100]00    <1> 	cmp	byte [timer_events], 0 
  1855 00005043 762F                <1> 	jna	short swpout_2
  1856                              <1> 	;
  1857 00005045 8A15[3F410100]      <1> 	mov	dl, [timer_events]
  1858                              <1> 
  1859 0000504B 51                  <1> 	push	ecx ; ***
  1860 0000504C 53                  <1> 	push	ebx ; ****
  1861 0000504D BB[7C4A0100]        <1> 	mov	ebx, timer_set ; beginning address of timer event
  1862                              <1> 			       ; structures 
  1863                              <1> swpout_timer_page_1:
  1864 00005052 8A0B                <1> 	mov	cl, [ebx]
  1865 00005054 08C9                <1> 	or	cl, cl ; 0 = free, >0 = process number
  1866 00005056 7415                <1> 	jz	short swpout_timer_page_3
  1867 00005058 8B4B0C              <1> 	mov	ecx, [ebx+12] ; response (signal return) address
  1868 0000505B 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 00005060 39C8                <1> 	cmp	eax, ecx
  1872 00005062 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 00005064 5B                  <1> 	pop	ebx ; ****
  1884 00005065 59                  <1> 	pop	ecx ; ***
  1885 00005066 5A                  <1> 	pop	edx ; **
  1886 00005067 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 00005069 FECA                <1> 	dec	dl
  1891 0000506B 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 0000506D 83C310              <1> 	add	ebx, 16
  1896 00005070 EBE0                <1> 	jmp	short swpout_timer_page_1	
  1897                              <1> 
  1898                              <1> swpout_timer_page_4:
  1899 00005072 5B                  <1> 	pop	ebx ; ****
  1900 00005073 59                  <1> 	pop	ecx ; ***
  1901                              <1> swpout_2:
  1902 00005074 89DA                <1> 	mov	edx, ebx	       ; Page table entry address	
  1903 00005076 89C3                <1> 	mov	ebx, eax	       ; Buffer (Page) Address				
  1904                              <1> 	;
  1905 00005078 E8A9010000          <1> 	call	link_swap_block
  1906 0000507D 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 0000507F 5A                  <1> 	pop	edx ; **
  1910 00005080 5B                  <1> 	pop	ebx ; *
  1911 00005081 EB33                <1> 	jmp	short swpout_nfspc_err 
  1912                              <1> swpout_3:
  1913 00005083 A900000080          <1> 	test	eax, 80000000h ; test bit 31 (this may not be needed!)
  1914 00005088 752C                <1> 	jnz	short swpout_nfspc_err  ; 10/06/2016 (bit 31 = 1 !)
  1915                              <1> 	;	
  1916 0000508A 56                  <1> 	push	esi ; **
  1917 0000508B 51                  <1> 	push	ecx ; ***
  1918 0000508C 50                  <1> 	push	eax ; sector address ; (31 bit !, bit 31 = 0)
  1919 0000508D 8B35[7E4B0100]      <1> 	mov	esi, [swp_drv]	
  1920 00005093 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 00005098 E8E5010000          <1> 	call	logical_disk_write
  1932                              <1> 	; edx = PTE address
  1933 0000509D 59                  <1> 	pop	ecx ; sector address	
  1934 0000509E 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 000050A0 B82C000000          <1> 	mov	eax, SWP_DISK_WRITE_ERR ; drive not ready or write error
  1939 000050A5 A3[484A0100]        <1> 	mov	[u.error], eax
  1940 000050AA 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 000050AC D1E1                <1> 	shl 	ecx, 1  ; 31 bit sector address from bit 1 to bit 31 
  1947 000050AE 890A                <1> 	mov 	[edx], ecx 
  1948                              <1> 		; bit 0 = 0 (swapped page)
  1949 000050B0 89D8                <1> 	mov	eax, ebx
  1950                              <1> swpout_retn:
  1951 000050B2 59                  <1> 	pop	ecx ; ***
  1952 000050B3 5E                  <1> 	pop	esi ; **
  1953 000050B4 5B                  <1> 	pop	ebx ; *
  1954 000050B5 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 000050B6 B82B000000          <1> 	mov	eax, SWP_NO_FREE_SPACE_ERR ; no free space
  1961                              <1> swpout_err_retn:
  1962 000050BB A3[484A0100]        <1> 	mov	[u.error], eax
  1963                              <1> 	;stc
  1964 000050C0 C3                  <1> 	retn
  1965                              <1> swpout_npts_err:
  1966 000050C1 B82D000000          <1> 	mov	eax, SWP_NO_PAGE_TO_SWAP_ERR
  1967 000050C6 5B                  <1> 	pop	ebx
  1968 000050C7 EBF2                <1> 	jmp	short swpout_err_retn
  1969                              <1> swpout_im_err:
  1970 000050C9 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; insufficient (out of) memory
  1971 000050CE EBEB                <1> 	jmp	short swpout_err_retn
  1972                              <1> 
  1973                              <1> swap_queue_shift:
  1974                              <1> 	; 10/06/2016
  1975                              <1> 	; 09/06/2016 - TRDOS 386 (TRDOS v2.0)
  1976                              <1> 	; 23/10/2014 - 20/07/2015 (Retro UNIX 386 v1)
  1977                              <1> 	;
  1978                              <1> 	; INPUT ->
  1979                              <1> 	;	EBX = Virtual (linear) address (bit 12 to 31) 
  1980                              <1> 	;	      and process number combination (bit 0 to 11)
  1981                              <1> 	;	EBX = 0 -> shift/drop from the head (offset 0)
  1982                              <1> 	;	
  1983                              <1> 	; OUTPUT ->
  1984                              <1> 	;	If EBX input > 0 
  1985                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  1986                              <1> 	; 	   from the tail to the head, up to entry offset
  1987                              <1> 	; 	   which points to EBX input value or nothing
  1988                              <1> 	;	   to do if EBX value is not found on the queue.
  1989                              <1> 	;	   (The entry -with EBX value- will be removed
  1990                              <1> 	;	   from the queue if it is found.)
  1991                              <1> 	;
  1992                              <1> 	;	   EAX = 0		
  1993                              <1> 	;
  1994                              <1> 	;	If EBX input = 0
  1995                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  1996                              <1> 	; 	   from the tail to the head, if the PTE address
  1997                              <1> 	;	   which is pointed in head of the queue is marked
  1998                              <1> 	;	   as "accessed" or it is marked as "non present".
  1999                              <1> 	;	   (If "accessed" flag of the PTE -which is pointed
  2000                              <1> 	;	   in the head- is set -to 1-, it will be reset
  2001                              <1> 	;	   -to 0- and then, the queue will be rotated 
  2002                              <1> 	;	   -without dropping pointer of the PTE from 
  2003                              <1> 	;	   the queue- for 4 bytes on head to tail direction.
  2004                              <1> 	;	   Pointer in the head will be moved into the tail,
  2005                              <1> 	;	   other PTEs will be shifted on head direction.)
  2006                              <1> 	;
  2007                              <1> 	;	   Swap queue will be shifted up to the first
  2008                              <1> 	;	   'present' or 'non accessed' page will be found
  2009                              <1> 	;	   (as pointed) on the queue head (then it will be
  2010                              <1>         ;          removed/dropped from the queue).
  2011                              <1> 	;
  2012                              <1> 	;	   EAX (> 0) = PTE value of the page which is
  2013                              <1> 	;		 (it's pointer -virtual address-) dropped
  2014                              <1> 	;		 (removed) from swap queue.
  2015                              <1> 	;	   EBX = PTE address of the page (if EAX > 0)
  2016                              <1> 	;	         which is (it's pointer -virtual address-)
  2017                              <1> 	;		 dropped (removed) from swap queue.
  2018                              <1> 	;
  2019                              <1> 	;	   EAX = 0 -> empty swap queue ! 
  2020                              <1> 	;
  2021                              <1> 	; Modified Registers -> EAX, EBX (if EAX > 0)
  2022                              <1> 	;
  2023 000050D0 0FB705[7C4B0100]    <1> 	movzx   eax, word [swpq_count]  ; Max. 1024
  2024 000050D7 6621C0              <1> 	and	ax, ax
  2025 000050DA 7433                <1> 	jz	short swpqs_retn
  2026 000050DC 57                  <1> 	push	edi
  2027 000050DD 56                  <1> 	push	esi
  2028 000050DE 51                  <1> 	push	ecx
  2029 000050DF 53                  <1> 	push	ebx
  2030 000050E0 BE00E00800          <1> 	mov	esi, swap_queue
  2031 000050E5 89C1                <1> 	mov	ecx, eax
  2032 000050E7 09DB                <1> 	or	ebx, ebx
  2033 000050E9 7425                <1> 	jz	short swpqs_7
  2034                              <1> swpqs_1:
  2035 000050EB AD                  <1> 	lodsd
  2036 000050EC 39D8                <1> 	cmp	eax, ebx
  2037 000050EE 7406                <1> 	je	short swpqs_2
  2038 000050F0 E2F9                <1> 	loop	swpqs_1
  2039                              <1> 	; 10/06/2016
  2040 000050F2 29C0                <1> 	sub	eax, eax 
  2041 000050F4 EB15                <1> 	jmp	short swpqs_6
  2042                              <1> swpqs_2:
  2043 000050F6 89F7                <1> 	mov	edi, esi
  2044 000050F8 83EF04              <1> 	sub 	edi, 4
  2045                              <1> swpqs_3:
  2046 000050FB 66FF0D[7C4B0100]    <1> 	dec	word [swpq_count]
  2047 00005102 7403                <1> 	jz	short swpqs_5
  2048                              <1> swpqs_4:
  2049 00005104 49                  <1> 	dec 	ecx
  2050 00005105 F3A5                <1> 	rep	movsd	; shift up (to the head)
  2051                              <1> swpqs_5:
  2052 00005107 31C0                <1> 	xor	eax, eax
  2053 00005109 8907                <1> 	mov	[edi], eax
  2054                              <1> swpqs_6:
  2055 0000510B 5B                  <1> 	pop	ebx
  2056                              <1> swpqs_14:
  2057 0000510C 59                  <1> 	pop	ecx
  2058 0000510D 5E                  <1> 	pop	esi
  2059 0000510E 5F                  <1> 	pop	edi
  2060                              <1> swpqs_retn:
  2061 0000510F C3                  <1> 	retn		
  2062                              <1> swpqs_7:
  2063 00005110 89F7                <1> 	mov	edi, esi ; head
  2064 00005112 AD                  <1> 	lodsd
  2065                              <1> 	; 20/07/2015
  2066 00005113 89C3                <1> 	mov	ebx, eax
  2067 00005115 81E300F0FFFF        <1> 	and	ebx, ~PAGE_OFF ; ~0FFFh 
  2068                              <1> 		      ; ebx = virtual address (at page boundary)	
  2069 0000511B 25FF0F0000          <1> 	and	eax, PAGE_OFF ; 0FFFh
  2070                              <1> 		      ; ax = process number (1 to 4095)
  2071 00005120 3A05[334A0100]      <1> 	cmp	al, [u.uno]
  2072                              <1> 		; Max. 16 (nproc) processes for Retro UNIX 386 v1
  2073 00005126 7507                <1> 	jne	short swpqs_8
  2074 00005128 A1[384A0100]        <1> 	mov	eax, [u.pgdir]
  2075 0000512D EB28                <1> 	jmp	short swpqs_9
  2076                              <1> swpqs_8:
  2077                              <1> 	; 09/06/2016
  2078 0000512F 80B8[2F470100]00    <1> 	cmp	byte [eax+p.stat-1], 0
  2079 00005136 76C3                <1> 	jna	short swpqs_3     ; free (or terminated) process
  2080 00005138 80B8[2F470100]02    <1> 	cmp	byte [eax+p.stat-1], 2 ; waiting
  2081 0000513F 77BA                <1> 	ja	short swpqs_3 	  ; zombie (3) or undefined ?	
  2082                              <1> 
  2083                              <1> 	;shl	ax, 2
  2084 00005141 C0E002              <1> 	shl	al, 2
  2085 00005144 8B80[3C470100]      <1> 	mov 	eax, [eax+p.upage-4]
  2086 0000514A 09C0                <1> 	or	eax, eax
  2087 0000514C 74AD                <1> 	jz	short swpqs_3 ; invalid upage
  2088 0000514E 83C05C              <1> 	add	eax, u.pgdir - user
  2089                              <1> 			 ; u.pgdir value for the process
  2090                              <1> 			 ; is in [eax]
  2091 00005151 8B00                <1> 	mov	eax, [eax]
  2092 00005153 21C0                <1> 	and	eax, eax
  2093 00005155 74A4                <1> 	jz	short swpqs_3 ; invalid page directory
  2094                              <1> swpqs_9:
  2095 00005157 52                  <1> 	push	edx
  2096                              <1> 	; eax = page directory
  2097                              <1> 	; ebx = virtual address
  2098 00005158 E829FBFFFF          <1> 	call	get_pte
  2099 0000515D 89D3                <1> 	mov	ebx, edx	; PTE address
  2100 0000515F 5A                  <1> 	pop	edx
  2101                              <1> 	; 10/06/2016
  2102 00005160 723B                <1> 	jc	short swpqs_13 ; empty PDE
  2103                              <1> 	; EAX = PTE value
  2104 00005162 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0 = 1
  2105 00005164 7437                <1> 	jz	short swpqs_13  ; Drop non-present page
  2106                              <1> 			        ; from the queue (head)
  2107 00005166 A802                <1> 	test	al, PTE_A_WRITE	; bit 1 = 0 (read only)
  2108 00005168 7433                <1> 	jz	short swpqs_13  ; Drop read only page
  2109                              <1> 			        ; from the queue (head) 	
  2110                              <1> 	;test	al, PTE_A_ACCESS ; bit 5 = 1 (Accessed)
  2111                              <1> 	;jnz	short swpqs_11  ; present
  2112                              <1> 			        ; accessed page
  2113 0000516A 0FBAF005            <1>         btr     eax, PTE_A_ACCESS_BIT ; reset 'accessed' bit
  2114 0000516E 7211                <1> 	jc	short swpqs_11  ; accessed page
  2115                              <1> 
  2116 00005170 49                  <1> 	dec	ecx
  2117 00005171 66890D[7C4B0100]    <1> 	mov	[swpq_count], cx
  2118 00005178 7402                <1>         jz      short swpqs_10
  2119                              <1> 		; esi = head + 4
  2120                              <1> 		; edi = head
  2121 0000517A F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2122                              <1> swpqs_10:
  2123 0000517C 890F                <1> 	mov	[edi], ecx ; 0
  2124 0000517E 59                  <1> 	pop	ecx       	;  EBX (input) in stack
  2125                              <1> 				;  EBX = PTE address	
  2126 0000517F EB8B                <1> 	jmp	short swpqs_14 
  2127                              <1> 
  2128                              <1> swpqs_11:
  2129 00005181 8903                <1> 	mov	[ebx], eax     ; save changed attribute
  2130                              <1> 	; Rotation (head -> tail)
  2131 00005183 49                  <1> 	dec	ecx     ; entry count -> last entry number		
  2132 00005184 74F6                <1> 	jz	short swpqs_10
  2133                              <1> 		; esi = head + 4
  2134                              <1> 		; edi = head
  2135 00005186 8B07                <1> 	mov	eax, [edi] ; 20/07/2015
  2136 00005188 F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2137 0000518A 8907                <1> 	mov	[edi], eax ; head -> tail ; [k] = [1]
  2138                              <1> 
  2139 0000518C 668B0D[7C4B0100]    <1> 	mov	cx, [swpq_count]
  2140                              <1> 
  2141                              <1> swpqs_12:
  2142 00005193 BE00E00800          <1> 	mov	esi, swap_queue ; head
  2143 00005198 E973FFFFFF          <1>         jmp     swpqs_7
  2144                              <1> 
  2145                              <1> swpqs_13:
  2146 0000519D 49                  <1> 	dec	ecx
  2147 0000519E 66890D[7C4B0100]    <1> 	mov	[swpq_count], cx
  2148 000051A5 0F845CFFFFFF        <1>         jz      swpqs_5
  2149 000051AB EBE6                <1> 	jmp	short swpqs_12
  2150                              <1> 
  2151                              <1> add_to_swap_queue:
  2152                              <1> ; temporary - 16/09/2015
  2153 000051AD C3                  <1> retn
  2154                              <1> 	; 20/02/2017
  2155                              <1> 	; 20/07/2015
  2156                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2157                              <1> 	;
  2158                              <1> 	; Adds new page to swap queue
  2159                              <1> 	; (page directories and page tables must not be added
  2160                              <1> 	; to swap queue)	
  2161                              <1> 	;
  2162                              <1> 	; INPUT ->
  2163                              <1> 	;	EBX = Linear (Virtual) addr for current process
  2164                              <1> 	;	[u.uno]
  2165                              <1> 	;	20/02/2017
  2166                              <1> 	;	(Linear address = CORE + user's virtual address)
  2167                              <1> 	;
  2168                              <1> 	; OUTPUT ->
  2169                              <1> 	;	EAX = [swpq_count]
  2170                              <1> 	;	      (after the PTE has been added)
  2171                              <1> 	;	EAX = 0 -> Swap queue is full, (1024 entries)
  2172                              <1> 	;	      the PTE could not be added.
  2173                              <1> 	;
  2174                              <1> 	; Modified Registers -> EAX
  2175                              <1> 	;
  2176 000051AE 53                  <1> 	push	ebx
  2177 000051AF 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2178 000051B4 8A1D[334A0100]      <1> 	mov	bl, [u.uno] ; current process number
  2179 000051BA E811FFFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2180                              <1> 				 ; it is already on the queue
  2181                              <1> 		; then add it to the tail of the queue
  2182 000051BF 0FB705[7C4B0100]    <1> 	movzx	eax, word [swpq_count]
  2183 000051C6 663D0004            <1> 	cmp	ax, 1024
  2184 000051CA 7205                <1> 	jb	short atsq_1
  2185 000051CC 6629C0              <1> 	sub	ax, ax
  2186 000051CF 5B                  <1> 	pop	ebx
  2187 000051D0 C3                  <1> 	retn
  2188                              <1> atsq_1:
  2189 000051D1 56                  <1> 	push	esi
  2190 000051D2 BE00E00800          <1> 	mov	esi, swap_queue
  2191 000051D7 6621C0              <1> 	and	ax, ax
  2192 000051DA 740A                <1> 	jz	short atsq_2
  2193 000051DC 66C1E002            <1> 	shl	ax, 2	; convert to offset
  2194 000051E0 01C6                <1> 	add	esi, eax
  2195 000051E2 66C1E802            <1> 	shr	ax, 2
  2196                              <1> atsq_2:
  2197 000051E6 6640                <1> 	inc	ax
  2198 000051E8 891E                <1> 	mov	[esi], ebx ; Virtual address + [u.uno] combination
  2199 000051EA 66A3[7C4B0100]      <1> 	mov	[swpq_count], ax
  2200 000051F0 5E                  <1> 	pop	esi
  2201 000051F1 5B                  <1> 	pop	ebx
  2202 000051F2 C3                  <1> 	retn
  2203                              <1> 
  2204                              <1> unlink_swap_block:
  2205                              <1> 	; 15/09/2015
  2206                              <1> 	; 30/04/2015
  2207                              <1> 	; 18/04/2015
  2208                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2209                              <1> 	;
  2210                              <1> 	; INPUT -> 
  2211                              <1> 	;	EAX = swap disk/file offset address
  2212                              <1> 	;	      (bit 1 to bit 31)
  2213                              <1> 	; OUTPUT ->
  2214                              <1> 	;	[swpd_free] is increased
  2215                              <1> 	;	(corresponding SWAP DISK ALLOC. TABLE bit is SET)
  2216                              <1> 	;
  2217                              <1> 	; Modified Registers -> EAX
  2218                              <1> 	;
  2219 000051F3 53                  <1> 	push	ebx
  2220 000051F4 52                  <1> 	push	edx
  2221                              <1> 	;
  2222 000051F5 C1E804              <1> 	shr	eax, SECTOR_SHIFT+1  ;3+1 ; shift sector address to 
  2223                              <1> 				     ; 3 bits right
  2224                              <1> 				     ; to get swap block/page number
  2225 000051F8 89C2                <1> 	mov	edx, eax
  2226                              <1> 	; 15/09/2015
  2227 000051FA C1EA03              <1> 	shr	edx, 3		     ; to get offset to S.A.T.
  2228                              <1> 				     ; (1 allocation bit = 1 page)
  2229                              <1> 				     ; (1 allocation bytes = 8 pages)
  2230 000051FD 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2231                              <1> 				     ; (to get 32 bit position)			
  2232                              <1> 	;
  2233 00005200 BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table address
  2234 00005205 01D3                <1> 	add	ebx, edx
  2235 00005207 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
  2236                              <1> 				     ; (allocation bit position)	 
  2237 0000520A 3B05[8A4B0100]      <1> 	cmp 	eax, [swpd_next]     ; is the new free block addr. lower
  2238                              <1> 				     ; than the address in 'swpd_next' ?
  2239                              <1> 				     ; (next/first free block value)		
  2240 00005210 7305                <1> 	jnb	short uswpbl_1	     ; no	
  2241 00005212 A3[8A4B0100]        <1> 	mov	[swpd_next], eax     ; yes	
  2242                              <1> uswpbl_1:
  2243 00005217 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate block
  2244                              <1> 				     ; set relevant bit to 1.
  2245                              <1> 				     ; set CF to the previous bit value	
  2246 0000521A F5                  <1> 	cmc			     ; complement carry flag	
  2247 0000521B 7206                <1> 	jc	short uswpbl_2	     ; do not increase swfd_free count
  2248                              <1> 				     ; if the block is already deallocated
  2249                              <1> 				     ; before.	
  2250 0000521D FF05[864B0100]      <1>         inc     dword [swpd_free]
  2251                              <1> uswpbl_2:
  2252 00005223 5A                  <1> 	pop	edx
  2253 00005224 5B                  <1> 	pop	ebx
  2254 00005225 C3                  <1> 	retn
  2255                              <1> 
  2256                              <1> link_swap_block:
  2257                              <1> 	; 01/07/2015
  2258                              <1> 	; 18/04/2015
  2259                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2260                              <1> 	;
  2261                              <1> 	; INPUT -> none
  2262                              <1> 	;
  2263                              <1> 	; OUTPUT ->
  2264                              <1> 	;	EAX = OFFSET ADDRESS OF THE ALLOCATED BLOCK (4096 bytes)
  2265                              <1> 	;	      in sectors (corresponding 
  2266                              <1> 	;	      SWAP DISK ALLOCATION TABLE bit is RESET)
  2267                              <1> 	;
  2268                              <1> 	;	CF = 1 and EAX = 0 
  2269                              <1> 	; 		   if there is not a free block to be allocated	
  2270                              <1> 	;
  2271                              <1> 	; Modified Registers -> none (except EAX)
  2272                              <1> 	;
  2273                              <1> 
  2274                              <1> 	;mov	eax, [swpd_free]
  2275                              <1> 	;and	eax, eax
  2276                              <1> 	;jz	short out_of_swpspc
  2277                              <1> 	;
  2278 00005226 53                  <1> 	push	ebx
  2279 00005227 51                  <1> 	push	ecx
  2280                              <1> 	;
  2281 00005228 BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table offset
  2282 0000522D 89D9                <1> 	mov	ecx, ebx
  2283 0000522F 031D[8A4B0100]      <1> 	add	ebx, [swpd_next] ; Free block searching starts from here
  2284                              <1> 				 ; next_free_swap_block >> 5
  2285 00005235 030D[8E4B0100]      <1> 	add	ecx, [swpd_last] ; Free block searching ends here
  2286                              <1> 				 ; (total_swap_blocks - 1) >> 5
  2287                              <1> lswbl_scan:
  2288 0000523B 39CB                <1> 	cmp	ebx, ecx
  2289 0000523D 770A                <1> 	ja	short lswbl_notfound
  2290                              <1> 	;
  2291 0000523F 0FBC03              <1> 	bsf	eax, [ebx] ; Scans source operand for first bit set (1).
  2292                              <1> 			   ; Clears ZF if a bit is found set (1) and 
  2293                              <1> 			   ; loads the destination with an index to
  2294                              <1> 			   ; first set bit. (0 -> 31) 
  2295                              <1> 			   ; Sets ZF to 1 if no bits are found set.
  2296                              <1> 	; 01/07/2015
  2297 00005242 751C                <1> 	jnz	short lswbl_found ; ZF = 0 -> a free block has been found
  2298                              <1> 			 ;
  2299                              <1> 			 ; NOTE:  a Swap Disk Allocation Table bit 
  2300                              <1> 			 ;	  with value of 1 means 
  2301                              <1> 			 ;	  the corresponding page is free 
  2302                              <1> 			 ;	  (Retro UNIX 386 v1 feaure only!)
  2303 00005244 83C304              <1> 	add	ebx, 4
  2304                              <1> 			 ; We return back for searching next page block
  2305                              <1> 			 ; NOTE: [swpd_free] is not ZERO; so, 
  2306                              <1> 			 ;	 we always will find at least 1 free block here.
  2307 00005247 EBF2                <1> 	jmp    	short lswbl_scan
  2308                              <1> 	;
  2309                              <1> lswbl_notfound:	
  2310 00005249 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2311 0000524F 890D[8A4B0100]      <1> 	mov	[swpd_next], ecx ; next/first free page = last page 
  2312                              <1> 				 ; (unlink_swap_block procedure will change it)
  2313 00005255 31C0                <1> 	xor	eax, eax
  2314 00005257 A3[864B0100]        <1> 	mov	[swpd_free], eax
  2315 0000525C F9                  <1> 	stc
  2316                              <1> lswbl_ok:
  2317 0000525D 59                  <1> 	pop	ecx
  2318 0000525E 5B                  <1> 	pop	ebx
  2319 0000525F C3                  <1> 	retn
  2320                              <1> 	;
  2321                              <1> ;out_of_swpspc:
  2322                              <1> ;	stc
  2323                              <1> ;	retn
  2324                              <1> 
  2325                              <1> lswbl_found:
  2326 00005260 89D9                <1> 	mov	ecx, ebx
  2327 00005262 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2328 00005268 890D[8A4B0100]      <1> 	mov	[swpd_next], ecx ; Set first free block searching start
  2329                              <1> 				 ; address/offset (to the next)
  2330 0000526E FF0D[864B0100]      <1>         dec     dword [swpd_free] ; 1 block has been allocated (X = X-1) 
  2331                              <1> 	;
  2332 00005274 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2333                              <1> 				 ; is copied into the Carry Flag and then cleared
  2334                              <1> 				 ; in the destination.
  2335                              <1> 				 ;
  2336                              <1> 				 ; Reset the bit which is corresponding to the 
  2337                              <1> 				 ; (just) allocated block.
  2338 00005277 C1E105              <1> 	shl	ecx, 5		 ; (block offset * 32) + block index
  2339 0000527A 01C8                <1> 	add	eax, ecx	 ; = block number
  2340 0000527C C1E003              <1> 	shl	eax, SECTOR_SHIFT ; 3, sector (offset) address of the block
  2341                              <1> 				 ; 1 block =  8 sectors
  2342                              <1> 	;
  2343                              <1> 	; EAX = offset address of swap disk/file sector (beginning of the block)
  2344                              <1> 	;
  2345                              <1> 	; NOTE: The relevant page table entry will be updated
  2346                              <1> 	;       according to this EAX value...
  2347                              <1> 	;
  2348 0000527F EBDC                <1> 	jmp	short lswbl_ok
  2349                              <1> 
  2350                              <1> logical_disk_read:
  2351                              <1> 	; 20/07/2015
  2352                              <1> 	; 09/03/2015 (temporary code here)
  2353                              <1> 	;
  2354                              <1> 	; INPUT ->
  2355                              <1> 	; 	ESI = Logical disk description table address
  2356                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2357                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2358                              <1> 	; 	ECX = Sector count
  2359                              <1> 	;
  2360                              <1> 	;
  2361 00005281 C3                  <1> 	retn
  2362                              <1> 
  2363                              <1> logical_disk_write:
  2364                              <1> 	; 20/07/2015
  2365                              <1> 	; 09/03/2015 (temporary code here)
  2366                              <1> 	;
  2367                              <1> 	; INPUT ->
  2368                              <1> 	; 	ESI = Logical disk description table address
  2369                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2370                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2371                              <1> 	; 	ECX = Sector count
  2372                              <1> 	;
  2373 00005282 C3                  <1> 	retn
  2374                              <1> 
  2375                              <1> get_physical_addr:
  2376                              <1> 	; 20/02/2017
  2377                              <1> 	; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  2378                              <1> 	; 18/10/2015
  2379                              <1> 	; 29/07/2015
  2380                              <1> 	; 20/07/2015
  2381                              <1> 	; 04/06/2015
  2382                              <1> 	; 20/05/2015
  2383                              <1> 	; 28/04/2015
  2384                              <1> 	; 18/04/2015
  2385                              <1> 	; Get physical address
  2386                              <1> 	;     (allocates a new page for user if it is not present)
  2387                              <1> 	;	
  2388                              <1> 	; (This subroutine is needed for mapping user's virtual 
  2389                              <1> 	; (buffer) address to physical address (of the buffer).)
  2390                              <1> 	; ('sys write', 'sys read' system calls...)
  2391                              <1> 	;
  2392                              <1> 	; INPUT ->
  2393                              <1> 	;	EBX = virtual address
  2394                              <1> 	;	u.pgdir = page directory (physical) address
  2395                              <1> 	;
  2396                              <1> 	; OUTPUT ->
  2397                              <1> 	;	EAX = physical address 
  2398                              <1> 	;	EBX = linear address	
  2399                              <1> 	;	EDX = physical address of the page frame
  2400                              <1> 	;	      (with attribute bits)
  2401                              <1> 	;	ECX = byte count within the page frame
  2402                              <1> 	;
  2403                              <1> 	; Modified Registers -> EAX, EBX, ECX, EDX
  2404                              <1> 	;
  2405 00005283 81C300004000        <1> 	add	ebx, CORE ; 18/10/2015
  2406                              <1> get_physical_addr_x: ; 27/05/2016
  2407 00005289 A1[384A0100]        <1> 	mov	eax, [u.pgdir]
  2408 0000528E E8F3F9FFFF          <1> 	call	get_pte
  2409                              <1> 		; EDX = Page table entry address (if CF=0)
  2410                              <1> 	        ;       Page directory entry address (if CF=1)
  2411                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  2412                              <1> 		; EAX = Page table entry value (page address)
  2413                              <1> 		;	CF = 1 -> PDE not present or invalid ? 
  2414 00005293 731C                <1> 	jnc	short gpa_1
  2415                              <1> 	;
  2416 00005295 E8D1F8FFFF          <1> 	call	allocate_page
  2417 0000529A 727F                <1> 	jc	short gpa_im_err  ; 'insufficient memory' error
  2418                              <1> gpa_0:
  2419 0000529C E844F9FFFF          <1> 	call 	clear_page
  2420                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  2421 000052A1 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  2422                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  2423                              <1> 			   ; (user, writable, present page)	
  2424 000052A3 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  2425 000052A5 A1[384A0100]        <1> 	mov	eax, [u.pgdir]	
  2426 000052AA E8D7F9FFFF          <1> 	call	get_pte
  2427 000052AF 726A                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2428                              <1> gpa_1:
  2429                              <1> 	; EAX = PTE value, EDX = PTE address
  2430 000052B1 A801                <1> 	test 	al, PTE_A_PRESENT
  2431 000052B3 753E                <1> 	jnz	short gpa_3
  2432 000052B5 09C0                <1> 	or	eax, eax
  2433 000052B7 7454                <1> 	jz	short gpa_4  ; Allocate a new page
  2434                              <1> 	; 20/07/2015
  2435 000052B9 55                  <1> 	push	ebp
  2436 000052BA 89DD                <1> 	mov	ebp, ebx ; virtual (linear) address
  2437                              <1> 	; reload swapped page
  2438 000052BC E860000000          <1> 	call	reload_page ; 28/04/2015
  2439 000052C1 5D                  <1> 	pop	ebp
  2440 000052C2 7248                <1> 	jc	short gpa_retn
  2441                              <1> gpa_2:
  2442                              <1> 	; 20/02/2017
  2443                              <1> 	; If a page will contain a Signal Response Byte
  2444                              <1> 	; it must not be swapped out, because
  2445                              <1> 	; timer service or irq callback service
  2446                              <1> 	; will write a signal return/response byte 
  2447                              <1> 	; directly by using physical address of Signal
  2448                              <1> 	; Response Byte.(Even if process is not running,
  2449                              <1> 	; or it is running with swapped out pages.)
  2450                              <1> 	;
  2451                              <1> 	; 'no_page_swap' will be set by 'systimer' or
  2452                              <1> 	; 'syscalbac' sistem functions/calls. (*)
  2453                              <1> 	;
  2454 000052C4 803D[7E460100]00    <1> 	cmp	byte [no_page_swap], 0
  2455 000052CB 761B                <1> 	jna	short gpa_5 ; this page can be swapped out
  2456                              <1> 	; this page must not be swapped out
  2457                              <1> 	; but 'no_page_swap' must be reset here
  2458                              <1> 	; imediately for other callers (*)
  2459                              <1> 	; (otherwise, swap queue would not be long enough) 
  2460 000052CD C605[7E460100]00    <1> 	mov	byte [no_page_swap], 0
  2461 000052D4 53                  <1> 	push	ebx
  2462 000052D5 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2463 000052DA 8A1D[334A0100]      <1> 	mov	bl, [u.uno] ; current process number
  2464 000052E0 E8EBFDFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2465                              <1> 				 ; it is already on the queue
  2466 000052E5 5B                  <1> 	pop	ebx
  2467 000052E6 EB07                <1> 	jmp	short gpa_6
  2468                              <1> gpa_5:
  2469                              <1> 	; 20/07/2015
  2470                              <1> 	; 20/05/2015
  2471                              <1> 	; add this page to swap queue
  2472 000052E8 50                  <1> 	push	eax 
  2473                              <1> 	; EBX = Linear (CORE+virtual) address ; 20/02/2017 
  2474 000052E9 E8BFFEFFFF          <1> 	call 	add_to_swap_queue
  2475 000052EE 58                  <1> 	pop	eax
  2476                              <1> gpa_6:
  2477                              <1> 		; PTE address in EDX
  2478                              <1> 		; virtual address in EBX
  2479                              <1> 	; EAX = memory page address
  2480 000052EF 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_USER + PTE_A_WRITE
  2481                              <1> 				  ; present flag, bit 0 = 1
  2482                              <1> 				  ; user flag, bit 2 = 1	
  2483                              <1> 				  ; writable flag, bit 1 = 1
  2484 000052F1 8902                <1> 	mov	[edx], eax  ; Update PTE value
  2485                              <1> gpa_3:
  2486                              <1> 	; 18/10/2015
  2487 000052F3 89D9                <1> 	mov	ecx, ebx
  2488 000052F5 81E1FF0F0000        <1> 	and	ecx, PAGE_OFF
  2489 000052FB 89C2                <1> 	mov 	edx, eax
  2490 000052FD 662500F0            <1> 	and	ax, PTE_A_CLEAR
  2491 00005301 01C8                <1> 	add	eax, ecx
  2492 00005303 F7D9                <1> 	neg	ecx ; 1 -> -1 (0FFFFFFFFh), 4095 (0FFFh) -> -4095
  2493 00005305 81C100100000        <1> 	add	ecx, PAGE_SIZE
  2494 0000530B F8                  <1> 	clc
  2495                              <1> gpa_retn:
  2496 0000530C C3                  <1> 	retn	
  2497                              <1> gpa_4:	
  2498 0000530D E859F8FFFF          <1> 	call	allocate_page
  2499 00005312 7207                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2500 00005314 E8CCF8FFFF          <1> 	call	clear_page
  2501 00005319 EBA9                <1> 	jmp	short gpa_2
  2502                              <1> 
  2503                              <1> gpa_im_err:	
  2504 0000531B B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2505                              <1> 				  ; Major error = 0 (No protection fault)	
  2506 00005320 C3                  <1> 	retn
  2507                              <1> 
  2508                              <1> reload_page:
  2509                              <1> 	; 20/07/2015
  2510                              <1> 	; 28/04/2015 (Retro UNIX 386 v1 - beginning)
  2511                              <1> 	;
  2512                              <1> 	; Reload (Restore) swapped page at memory
  2513                              <1> 	;
  2514                              <1> 	; INPUT -> 
  2515                              <1> 	;	EBP = Virtual (linear) memory address
  2516                              <1> 	;	EAX = PTE value (swap disk sector address)
  2517                              <1> 	;	(Swap disk sector address = bit 1 to bit 31 of EAX)	
  2518                              <1> 	; OUTPUT ->
  2519                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF RELOADED PAGE
  2520                              <1> 	;
  2521                              <1> 	;	CF = 1 and EAX = error code
  2522                              <1> 	;
  2523                              <1> 	; Modified Registers -> none (except EAX)
  2524                              <1> 	;
  2525 00005321 D1E8                <1> 	shr	eax, 1   ; Convert PTE value to swap disk address 
  2526 00005323 53                  <1> 	push	ebx      ;
  2527 00005324 89C3                <1> 	mov	ebx, eax ; Swap disk (offset) address	
  2528 00005326 E840F8FFFF          <1> 	call	allocate_page
  2529 0000532B 720C                <1> 	jc	short rlp_im_err
  2530 0000532D 93                  <1> 	xchg 	eax, ebx	
  2531                              <1> 	; EBX = Physical memory (page) address
  2532                              <1> 	; EAX = Swap disk (offset) address
  2533                              <1> 	; EBP = Virtual (linear) memory address
  2534 0000532E E877FCFFFF          <1> 	call	swap_in
  2535 00005333 720B                <1> 	jc	short rlp_swp_err  ; (swap disk/file read error)
  2536 00005335 89D8                <1> 	mov	eax, ebx	
  2537                              <1> rlp_retn:
  2538 00005337 5B                  <1> 	pop	ebx
  2539 00005338 C3                  <1> 	retn
  2540                              <1> 	
  2541                              <1> rlp_im_err:	
  2542 00005339 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2543                              <1> 				  ; Major error = 0 (No protection fault)	
  2544 0000533E EBF7                <1> 	jmp	short rlp_retn
  2545                              <1> 
  2546                              <1> rlp_swp_err:
  2547 00005340 B828000000          <1> 	mov 	eax, SWP_DISK_READ_ERR ; Swap disk read error !
  2548 00005345 EBF0                <1> 	jmp	short rlp_retn
  2549                              <1> 
  2550                              <1> 
  2551                              <1> copy_page_dir:
  2552                              <1> 	; 19/09/2015
  2553                              <1> 	; temporary - 07/09/2015
  2554                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2555                              <1> 	;
  2556                              <1> 	; INPUT -> 
  2557                              <1> 	;	[u.pgdir] = PHYSICAL (real/flat) ADDRESS of the parent's
  2558                              <1> 	;		    page directory.
  2559                              <1> 	; OUTPUT ->
  2560                              <1> 	;	EAX =  PHYSICAL (real/flat) ADDRESS of the child's
  2561                              <1> 	;	       page directory.
  2562                              <1> 	;	(New page directory with new page table entries.)
  2563                              <1> 	;	(New page tables with read only copies of the parent's
  2564                              <1> 	;	pages.)
  2565                              <1> 	;	EAX = 0 -> Error (CF = 1)
  2566                              <1> 	;
  2567                              <1> 	; Modified Registers -> none (except EAX)
  2568                              <1> 	;
  2569 00005347 E81FF8FFFF          <1> 	call	allocate_page
  2570 0000534C 723E                <1> 	jc	short cpd_err
  2571                              <1> 	;
  2572 0000534E 55                  <1> 	push	ebp ; 20/07/2015
  2573 0000534F 56                  <1> 	push	esi
  2574 00005350 57                  <1> 	push	edi
  2575 00005351 53                  <1> 	push	ebx
  2576 00005352 51                  <1> 	push	ecx
  2577 00005353 8B35[384A0100]      <1> 	mov	esi, [u.pgdir]
  2578 00005359 89C7                <1> 	mov	edi, eax
  2579 0000535B 50                  <1> 	push	eax ; save child's page directory address
  2580                              <1> 	; copy PDE 0 from the parent's page dir to the child's page dir
  2581                              <1> 	; (use same system space for all user page tables) 
  2582 0000535C A5                  <1> 	movsd
  2583 0000535D BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  2584 00005362 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  2585                              <1> cpd_0:	
  2586 00005367 AD                  <1> 	lodsd
  2587                              <1> 	;or	eax, eax
  2588                              <1>         ;jnz     short cpd_1
  2589 00005368 A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  2590 0000536A 7508                <1> 	jnz	short cpd_1
  2591                              <1>  	; (virtual address at the end of the page table)	
  2592 0000536C 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  2593 00005372 EB0F                <1> 	jmp	short cpd_2
  2594                              <1> cpd_1:	
  2595 00005374 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  2596 00005378 89C3                <1> 	mov	ebx, eax
  2597                              <1> 	; EBX = Parent's page table address
  2598 0000537A E81F000000          <1> 	call	copy_page_table
  2599 0000537F 720C                <1> 	jc	short cpd_p_err
  2600                              <1> 	; EAX = Child's page table address
  2601 00005381 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  2602                              <1> 			 ; set bit 0, bit 1 and bit 2 to 1
  2603                              <1> 			 ; (present, writable, user)
  2604                              <1> cpd_2:
  2605 00005383 AB                  <1> 	stosd
  2606 00005384 E2E1                <1> 	loop	cpd_0
  2607                              <1> 	;
  2608 00005386 58                  <1> 	pop	eax  ; restore child's page directory address
  2609                              <1> cpd_3:
  2610 00005387 59                  <1> 	pop	ecx
  2611 00005388 5B                  <1> 	pop	ebx
  2612 00005389 5F                  <1> 	pop	edi
  2613 0000538A 5E                  <1> 	pop	esi
  2614 0000538B 5D                  <1> 	pop	ebp
  2615                              <1> cpd_err:
  2616 0000538C C3                  <1> 	retn
  2617                              <1> cpd_p_err:
  2618                              <1> 	; release the allocated pages missing (recover free space)
  2619 0000538D 58                  <1> 	pop	eax  ; the new page directory address (physical)
  2620 0000538E 8B1D[384A0100]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  2621 00005394 E80BF9FFFF          <1> 	call 	deallocate_page_dir
  2622 00005399 29C0                <1> 	sub	eax, eax ; 0
  2623 0000539B F9                  <1> 	stc
  2624 0000539C EBE9                <1> 	jmp	short cpd_3	
  2625                              <1> 
  2626                              <1> copy_page_table:
  2627                              <1> 	; 19/09/2015
  2628                              <1> 	; temporary - 07/09/2015
  2629                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2630                              <1> 	;
  2631                              <1> 	; INPUT -> 
  2632                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS of the parent's page table.
  2633                              <1> 	;	EBP = page table entry index (from 'copy_page_dir')
  2634                              <1> 	; OUTPUT ->
  2635                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS of the child's page table.
  2636                              <1> 	;	EBP = (recent) page table index (for 'add_to_swap_queue')	
  2637                              <1> 	;	CF = 1 -> error 
  2638                              <1> 	;
  2639                              <1> 	; Modified Registers -> EBP (except EAX)
  2640                              <1> 	;
  2641 0000539E E8C8F7FFFF          <1> 	call	allocate_page
  2642 000053A3 725A                <1> 	jc	short cpt_err
  2643                              <1> 	;
  2644 000053A5 50                  <1> 	push	eax ; *
  2645                              <1> 	;push 	ebx
  2646 000053A6 56                  <1> 	push	esi
  2647 000053A7 57                  <1> 	push	edi
  2648 000053A8 52                  <1> 	push	edx
  2649 000053A9 51                  <1> 	push	ecx
  2650                              <1> 	;
  2651 000053AA 89DE                <1> 	mov	esi, ebx
  2652 000053AC 89C7                <1> 	mov	edi, eax
  2653 000053AE 89C2                <1> 	mov	edx, eax
  2654 000053B0 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  2655                              <1> cpt_0:
  2656 000053B6 AD                  <1> 	lodsd
  2657 000053B7 A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  2658 000053B9 750B                <1> 	jnz	short cpt_1
  2659 000053BB 21C0                <1> 	and	eax, eax
  2660 000053BD 7430                <1> 	jz	short cpt_2
  2661                              <1> 	; ebp = virtual (linear) address of the memory page
  2662 000053BF E85DFFFFFF          <1> 	call	reload_page ; 28/04/2015
  2663 000053C4 7234                <1> 	jc	short cpt_p_err
  2664                              <1> cpt_1:
  2665 000053C6 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  2666 000053CA 89C1                <1> 	mov	ecx, eax
  2667                              <1> 	; Allocate a new page for the child process
  2668 000053CC E89AF7FFFF          <1> 	call	allocate_page
  2669 000053D1 7227                <1> 	jc	short cpt_p_err
  2670 000053D3 57                  <1> 	push	edi
  2671 000053D4 56                  <1> 	push	esi
  2672 000053D5 89CE                <1> 	mov	esi, ecx
  2673 000053D7 89C7                <1> 	mov	edi, eax
  2674 000053D9 B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  2675 000053DE F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  2676 000053E0 5E                  <1> 	pop	esi
  2677 000053E1 5F                  <1> 	pop	edi
  2678                              <1> 	; 
  2679 000053E2 53                  <1> 	push	ebx
  2680 000053E3 50                  <1> 	push	eax
  2681 000053E4 89EB                <1> 	mov	ebx, ebp
  2682                              <1> 	; ebx = virtual address of the memory page
  2683 000053E6 E8C2FDFFFF          <1> 	call	add_to_swap_queue
  2684 000053EB 58                  <1> 	pop	eax
  2685 000053EC 5B                  <1> 	pop	ebx
  2686                              <1> 	;
  2687                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  2688 000053ED 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  2689                              <1> cpt_2:
  2690 000053EF AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  2691                              <1> 	;
  2692 000053F0 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  2693                              <1> 	;
  2694 000053F6 39D7                <1> 	cmp	edi, edx
  2695 000053F8 72BC                <1> 	jb	short cpt_0
  2696                              <1> cpt_p_err:
  2697 000053FA 59                  <1> 	pop	ecx
  2698 000053FB 5A                  <1> 	pop	edx
  2699 000053FC 5F                  <1> 	pop	edi
  2700 000053FD 5E                  <1> 	pop	esi
  2701                              <1> 	;pop	ebx
  2702 000053FE 58                  <1> 	pop	eax ; *
  2703                              <1> cpt_err:
  2704 000053FF C3                  <1> 	retn
  2705                              <1> 
  2706                              <1> 
  2707                              <1> allocate_memory_block:
  2708                              <1> 	; 03/04/2016
  2709                              <1> 	; 02/04/2016
  2710                              <1> 	; 01/04/2016
  2711                              <1> 	; 14/03/2016
  2712                              <1> 	; 13/03/2016
  2713                              <1> 	; 12/03/2016 (TRDOS 386 = TRDOS v2.0)
  2714                              <1> 	; Allocating contiguous memory pages (in the kernel's memory space)
  2715                              <1> 	;
  2716                              <1> 	; INPUT -> 
  2717                              <1> 	;	EAX = Beginning address (physical)
  2718                              <1> 	;	EAX = 0 -> Allocate memory block from the first proper aperture	
  2719                              <1> 	;	ECX = Number of bytes to be allocated
  2720                              <1> 	;
  2721                              <1> 	; OUTPUT ->
  2722                              <1> 	; 	1) cf = 0 -> successful
  2723                              <1> 	;	EAX = Beginning (physical) address of the allocated memory block
  2724                              <1> 	;	ECX = Number of allocated bytes (rounded up to page borders) 
  2725                              <1> 	;	2) cf = 1 -> unsuccessful
  2726                              <1> 	;	 2.1) If EAX > 0 -> 
  2727                              <1> 	;	      (Number of requested pages is more than # of free pages
  2728                              <1> 	;	       but contiguous free pages -the aperture- is not enough!)	   	
  2729                              <1> 	;	      EAX = Beginning address of available aperture
  2730                              <1> 	;		    (one of all aperture with max. aperture size/length)		
  2731                              <1> 	;	      ECX = Size of available aperture (memory block) in bytes
  2732                              <1> 	;	 2.2) If EAX = 0 -> Out of memory error 
  2733                              <1> 	;	            (number of free pages is less than requested number)
  2734                              <1> 	;	      ECX = Total number of free bytes (free pages * 4096) 
  2735                              <1> 	;		    (It is not number of contiguous free bytes)	
  2736                              <1> 	;
  2737                              <1> 	; (Modified Registers -> EAX, ECX)
  2738                              <1> 	;
  2739                              <1> 	; PURPOSE: Loading a file at memory for copying or running etc.
  2740                              <1> 	; If this procedure returns with cf is set, ECX contains maximum
  2741                              <1> 	; available space and EAX contains the beginning address of it.
  2742                              <1> 	; If EAX has zero, ECX contains total number of free bytes.
  2743                              <1> 	; If requested block has been successfully allocated (by rounding up to
  2744                              <1> 	; the last page border), it must be deallocated later by using
  2745                              <1> 	; 'dealloacate_memory_block' procedure.    
  2746                              <1> 
  2747 00005400 52                  <1> 	push	edx ; *
  2748 00005401 BAFF0F0000          <1> 	mov	edx, PAGE_SIZE - 1   ; 4095
  2749 00005406 01D1                <1> 	add	ecx, edx
  2750 00005408 01D0                <1> 	add	eax, edx
  2751 0000540A C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  2752                              <1> 
  2753                              <1> 	; ECX = number of contiguous pages to be allocated
  2754 0000540D 8B15[B0330100]      <1> 	mov	edx, [free_pages]
  2755 00005413 39D1                <1> 	cmp	ecx, edx
  2756 00005415 7775                <1> 	ja	short amb_6
  2757                              <1> 
  2758 00005417 C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; 12
  2759                              <1> 
  2760 0000541A 89C2                <1> 	mov	edx, eax 	     ; page number
  2761 0000541C C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2762                              <1> 				     ; (1 allocation bit = 1 page)
  2763                              <1> 				     ; (1 allocation bytes = 8 pages)
  2764 0000541F 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2765                              <1> 				     ; (to get 32 bit position)	
  2766 00005422 53                  <1> 	push	ebx ; **
  2767                              <1> amb_0:
  2768 00005423 890D[68400100]      <1> 	mov	[mem_ipg_count], ecx ; initial (reset) value of page count
  2769 00005429 890D[6C400100]      <1> 	mov	[mem_pg_count], ecx
  2770 0000542F 31C9                <1> 	xor	ecx, ecx ; 0
  2771 00005431 890D[70400100]      <1> 	mov	[mem_aperture], ecx ; 0
  2772 00005437 890D[74400100]      <1> 	mov	[mem_max_aperture], ecx ; 0
  2773                              <1> 	
  2774 0000543D BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address.
  2775 00005442 3B15[B4330100]      <1> 	cmp	edx, [next_page]     ; Is the beginning page address lower
  2776                              <1> 				     ; than the address in 'next_page' ?
  2777                              <1> 				     ; (the first/next free page of user space)		
  2778 00005448 7208                <1> 	jb	short amb_1
  2779 0000544A 3B15[B8330100]      <1> 	cmp 	edx, [last_page]     ; is the beginning page address higher
  2780                              <1> 				     ; than the address in 'last_page' ?
  2781                              <1> 				     ; (end of the memory)		
  2782 00005450 7606                <1> 	jna	short amb_2	     ; no	
  2783                              <1> amb_1:
  2784 00005452 8B15[B4330100]      <1> 	mov	edx, [next_page]     ; yes (reset to the first page of user space)
  2785                              <1> amb_2:
  2786 00005458 01D3                <1> 	add	ebx, edx
  2787                              <1> 
  2788 0000545A A3[78400100]        <1> 	mov	[mem_pg_pos], eax    ; beginning page no (for curr. mem. aperture)
  2789 0000545F A3[7C400100]        <1>  	mov	[mem_max_pg_pos], eax ; beginning page no for max. mem. aperture
  2790                              <1> 
  2791 00005464 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only (0 to 31)
  2792                              <1> 				     ; (allocation bit position)	 
  2793 00005467 744B                <1> 	jz	short amb_10	     ; 0	
  2794                              <1> amb_3:
  2795 00005469 8B13                <1> 	mov	edx, [ebx]
  2796 0000546B 88C1                <1> 	mov	cl, al ; 1 to 31
  2797 0000546D D3EA                <1> 	shr	edx, cl
  2798 0000546F 89D0                <1> 	mov	eax, edx
  2799                              <1> amb_4:
  2800 00005471 D1E8                <1> 	shr	eax, 1 ; (***)
  2801 00005473 7321                <1> 	jnc	short amb_7
  2802 00005475 FF05[70400100]      <1> 	inc	dword [mem_aperture]
  2803 0000547B FF0D[6C400100]      <1> 	dec	dword [mem_pg_count]
  2804 00005481 747B                <1> 	jz	short amb_15
  2805                              <1> amb_5:
  2806 00005483 80F91F              <1> 	cmp	cl, 31
  2807 00005486 7317                <1> 	jnb	short amb_8
  2808 00005488 FEC1                <1> 	inc	cl
  2809 0000548A EBE5                <1> 	jmp	short amb_4
  2810                              <1> 
  2811                              <1> amb_6:	; out_of_memory
  2812 0000548C 31C0                <1> 	xor	eax, eax ; 0
  2813 0000548E 89D1                <1> 	mov	ecx, edx ; free pages
  2814 00005490 C1E10C              <1> 	shl	ecx, PAGE_SHIFT
  2815 00005493 5A                  <1> 	pop	edx ; *
  2816 00005494 F9                  <1> 	stc
  2817 00005495 C3                  <1> 	retn
  2818                              <1> amb_7:
  2819 00005496 50                  <1> 	push	eax ; (***) allocation bits (in shifted status)
  2820 00005497 E819010000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2821 0000549C 58                  <1> 	pop	eax ; (***)
  2822 0000549D EBE4                <1> 	jmp	short amb_5
  2823                              <1> amb_8:
  2824 0000549F 28C9                <1> 	sub	cl, cl ; 0
  2825                              <1> amb_9:
  2826 000054A1 89DA                <1> 	mov	edx, ebx
  2827 000054A3 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL
  2828 000054A9 3B15[B8330100]      <1> 	cmp	edx, [last_page]
  2829 000054AF 7336                <1> 	jnb	short amb_14 ; contiguous pages not enough
  2830 000054B1 83C304              <1> 	add	ebx, 4
  2831                              <1> amb_10:
  2832 000054B4 8B03                <1> 	mov	eax, [ebx]
  2833 000054B6 21C0                <1> 	and 	eax, eax
  2834 000054B8 7406                <1>         jz      short amb_11 ; there is not a free page bit in this alloc dword
  2835 000054BA 40                  <1> 	inc	eax ; 0FFFFFFFFh -> 0
  2836 000054BB 740A                <1> 	jz	short amb_12 ; all of bits are set (32 free pages)
  2837 000054BD 48                  <1> 	dec	eax
  2838 000054BE EBB1                <1> 	jmp	short amb_4
  2839                              <1> amb_11:
  2840 000054C0 E8F0000000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2841 000054C5 EBDA                <1> 	jmp	short amb_9	
  2842                              <1> amb_12:
  2843 000054C7 B120                <1> 	mov	cl, 32
  2844 000054C9 390D[6C400100]      <1> 	cmp	[mem_pg_count], ecx ; 32
  2845 000054CF 7306                <1> 	jnb	short amb_13
  2846 000054D1 8B0D[6C400100]      <1> 	mov	ecx, [mem_pg_count]
  2847                              <1> amb_13:
  2848 000054D7 010D[70400100]      <1> 	add	[mem_aperture], ecx
  2849 000054DD 290D[6C400100]      <1> 	sub	[mem_pg_count], ecx
  2850 000054E3 7619                <1> 	jna	short amb_15
  2851 000054E5 EBB8                <1> 	jmp	short amb_8
  2852                              <1> amb_14:
  2853 000054E7 A1[7C400100]        <1> 	mov	eax, [mem_max_pg_pos] ; begin address of max. mem aperture	
  2854 000054EC 8B0D[74400100]      <1> 	mov	ecx, [mem_max_aperture] ; max. (largest) memory aperture
  2855 000054F2 C1E00C              <1> 	shl	eax, PAGE_SHIFT	     ; convert to phy. address in bytes
  2856 000054F5 C1E10C              <1> 	shl	ecx, PAGE_SHIFT	     ; convert to byte counts
  2857 000054F8 F9                  <1> 	stc
  2858 000054F9 E9AC000000          <1>         jmp     amb_25
  2859                              <1> 
  2860                              <1> amb_15: ; OK !
  2861 000054FE A1[78400100]        <1> 	mov	eax, [mem_pg_pos]    ; Beginning address as page number
  2862 00005503 8B0D[70400100]      <1> 	mov	ecx, [mem_aperture]  ; Free contiguous page count
  2863                              <1> amb_16:
  2864                              <1> 	; allocate contiguous memory pages (via memory allocation table bits)
  2865 00005509 89C2                <1> 	mov	edx, eax
  2866 0000550B C1EA05              <1> 	shr	edx, 5 ; 32 pages in one allocation dword (32 bits)
  2867 0000550E BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2868 00005513 01D3                <1> 	add	ebx, edx
  2869 00005515 83E01F              <1> 	and	eax, 1Fh ; 31
  2870                              <1> 	; 03/04/2016
  2871 00005518 BA20000000          <1> 	mov	edx, 32
  2872 0000551D 28C2                <1> 	sub	dl, al
  2873 0000551F 39CA                <1> 	cmp	edx, ecx
  2874 00005521 7602                <1> 	jna	short amb_17
  2875 00005523 89CA                <1> 	mov	edx, ecx
  2876                              <1> amb_17:
  2877 00005525 29D1                <1> 	sub	ecx, edx
  2878 00005527 51                  <1> 	push	ecx ; ***
  2879 00005528 89D1                <1> 	mov	ecx, edx
  2880                              <1> amb_18:		
  2881 0000552A 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2882                              <1> 				 ; is copied into the Carry Flag and then cleared
  2883                              <1> 				 ; in the destination.
  2884 0000552D FF0D[B0330100]      <1> 	dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
  2885 00005533 49                  <1> 	dec	ecx
  2886 00005534 7404                <1> 	jz	short amb_19
  2887 00005536 FEC0                <1> 	inc	al
  2888 00005538 EBF0                <1> 	jmp	short amb_18
  2889                              <1> amb_19:	
  2890 0000553A 59                  <1> 	pop	ecx ; ***
  2891 0000553B 21C9                <1> 	and	ecx, ecx ; 0 ?
  2892 0000553D 741E                <1> 	jz	short amb_22	
  2893                              <1> 	; 01/04/2016
  2894 0000553F B020                <1> 	mov	al, 32
  2895                              <1> amb_20:
  2896 00005541 83C304              <1> 	add	ebx, 4
  2897 00005544 39C1                <1> 	cmp	ecx, eax ; 32
  2898 00005546 7305                <1> 	jnb	short amb_21
  2899                              <1> 	; ECX < 32
  2900 00005548 28C0                <1> 	sub	al, al ; 0
  2901 0000554A 50                  <1> 	push	eax ; 0 ***
  2902 0000554B EBDD                <1> 	jmp	short amb_18
  2903                              <1> amb_21:
  2904 0000554D 2905[B0330100]      <1> 	sub	[free_pages], eax ; [free_pages] = [free_pages] - 32
  2905 00005553 C70300000000        <1> 	mov	dword [ebx], 0 ; reset 32 bits
  2906 00005559 29C1                <1> 	sub	ecx, eax ; 32
  2907 0000555B 75E4                <1> 	jnz	short amb_20
  2908                              <1> amb_22:
  2909 0000555D A1[78400100]        <1> 	mov	eax, [mem_pg_pos]   ; Beginning address as page number
  2910 00005562 8B0D[70400100]      <1> 	mov	ecx, [mem_aperture] ; Free contiguous page count
  2911                              <1> 	; [next_page] update
  2912 00005568 89C2                <1> 	mov	edx, eax
  2913                              <1> 	; 03/04/2016
  2914 0000556A C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2915                              <1> 				     ; (1 allocation bit = 1 page)
  2916                              <1> 				     ; (1 allocation bytes = 8 pages)
  2917 0000556D 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2918                              <1> 				     ; (to get 32 bit position)	
  2919 00005570 3B15[B4330100]      <1> 	cmp	edx, [next_page] ; first free page pointer offset
  2920 00005576 7732                <1> 	ja	short amb_25
  2921 00005578 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2922 0000557D 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2923 00005581 7721                <1> 	ja	short amb_24
  2924 00005583 89C2                <1> 	mov	edx, eax
  2925 00005585 01CA                <1> 	add	edx, ecx
  2926 00005587 C1EA03              <1> 	shr	edx, 3
  2927 0000558A 80E2FC              <1> 	and	dl, 0FCh
  2928                              <1> amb_23:
  2929 0000558D 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2930 00005591 7711                <1> 	ja	short amb_24
  2931 00005593 83C204              <1> 	add	edx, 4
  2932 00005596 3B15[B8330100]      <1> 	cmp	edx, [last_page]    ; last page pointer offset
  2933 0000559C 76EF                <1> 	jna	short amb_23
  2934 0000559E 8B15[BC330100]      <1> 	mov	edx, [first_page]   ; (for) beginning of user's space
  2935                              <1> amb_24:
  2936 000055A4 8915[B4330100]      <1> 	mov	[next_page], edx
  2937                              <1> amb_25:
  2938 000055AA 9C                  <1> 	pushf
  2939 000055AB C1E00C              <1> 	shl	eax, PAGE_SHIFT	     ; convert to phy. address in bytes
  2940 000055AE C1E10C              <1> 	shl	ecx, PAGE_SHIFT	     ; convert to byte counts
  2941 000055B1 9D                  <1> 	popf
  2942 000055B2 5B                  <1> 	pop	ebx ; **
  2943 000055B3 5A                  <1> 	pop	edx ; *
  2944 000055B4 C3                  <1> 	retn
  2945                              <1> 
  2946                              <1> amb_26:	; set maximum free memory aperture (free memory block size) 
  2947 000055B5 89DA                <1> 	mov	edx, ebx ; current address
  2948 000055B7 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL ; MAT beginning address
  2949                              <1> 	; 02/04/2016 
  2950 000055BD C1E203              <1> 	shl	edx, 3 ; MAT byte offset * 8 = page number base
  2951 000055C0 01CA                <1> 	add	edx, ecx ; current page number (ecx =  0 to 31)
  2952                              <1> 	;
  2953 000055C2 A1[70400100]        <1> 	mov	eax, [mem_aperture]
  2954 000055C7 21C0                <1> 	and	eax, eax
  2955 000055C9 7424                <1>         jz      short amb_27
  2956 000055CB C705[70400100]0000- <1>         mov     dword [mem_aperture], 0
  2956 000055D3 0000                <1>
  2957 000055D5 3B05[74400100]      <1> 	cmp	eax, [mem_max_aperture]
  2958 000055DB 7612                <1> 	jna	short amb_27
  2959 000055DD A3[74400100]        <1> 	mov	[mem_max_aperture], eax
  2960                              <1> 	;
  2961 000055E2 89D0                <1> 	mov	eax, edx
  2962 000055E4 2B05[74400100]      <1> 	sub	eax, [mem_max_aperture] ; the last aperture size in pages
  2963                              <1> 	; EAX = Beginning page number of the max. aperture 
  2964 000055EA A3[7C400100]        <1> 	mov	[mem_max_pg_pos], eax
  2965                              <1> amb_27: 
  2966 000055EF 42                  <1> 	inc	edx	
  2967 000055F0 8915[78400100]      <1> 	mov	[mem_pg_pos], edx ; next page
  2968                              <1> 
  2969 000055F6 A1[68400100]        <1> 	mov	eax, [mem_ipg_count] ; initial (reset) value of page count
  2970 000055FB A3[6C400100]        <1> 	mov	[mem_pg_count], eax
  2971                              <1> 
  2972 00005600 C3                  <1> 	retn
  2973                              <1> 
  2974                              <1> deallocate_memory_block:
  2975                              <1> 	; 03/04/2016
  2976                              <1> 	; 14/03/2016 (TRDOS 386 = TRDOS v2.0)
  2977                              <1> 	; Deallocating contiguous memory pages (in the kernel's memory space)
  2978                              <1> 	;
  2979                              <1> 	; INPUT -> 
  2980                              <1> 	;	EAX = Beginning address (physical)
  2981                              <1> 	;	ECX = Number of bytes to be deallocated
  2982                              <1> 	;
  2983                              <1> 	; OUTPUT ->
  2984                              <1> 	;	Memory Allocation Table bits will be updated
  2985                              <1> 	;	[free_pages] will be changed (increased)
  2986                              <1> 	;
  2987                              <1> 	; (Modified Registers -> EAX, ECX)
  2988                              <1> 	;
  2989                              <1> 	; PURPOSE: Unloading/Freeing a file -or an allocated memory block- 
  2990                              <1> 	; at memory after copying, running, saving, reading, writing etc.
  2991                              <1> 	;
  2992                              <1> 
  2993 00005601 52                  <1> 	push	edx ; *
  2994 00005602 53                  <1> 	push	ebx ; **
  2995                              <1> 
  2996 00005603 C1E80C              <1> 	shr	eax, PAGE_SHIFT	     ; 12
  2997 00005606 C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  2998                              <1> 
  2999                              <1> 	; EAX = Beginning page number
  3000                              <1> 	; ECX = Number of contiguous pages to be deallocated
  3001                              <1> damb_0:
  3002                              <1> 	; deallocate contiguous memory pages (via memory allocation table bits)
  3003 00005609 89C2                <1> 	mov	edx, eax
  3004 0000560B C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  3005                              <1> 				     ; (1 allocation bit = 1 page)
  3006                              <1> 				     ; (1 allocation bytes = 8 pages)
  3007 0000560E 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  3008                              <1> 				     ; (to get 32 bit position)	
  3009 00005611 3B15[B4330100]      <1> 	cmp	edx, [next_page] ; next free page
  3010 00005617 7306                <1> 	jnb	short damb_1
  3011 00005619 8915[B4330100]      <1> 	mov	[next_page], edx
  3012                              <1> damb_1:
  3013 0000561F BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  3014 00005624 01D3                <1> 	add	ebx, edx
  3015 00005626 83E01F              <1> 	and	eax, 1Fh ; 31
  3016                              <1> 
  3017                              <1> 	; 03/04/2016
  3018 00005629 BA20000000          <1> 	mov	edx, 32
  3019 0000562E 28C2                <1> 	sub	dl, al
  3020 00005630 39CA                <1> 	cmp	edx, ecx
  3021 00005632 7602                <1> 	jna	short damb_2
  3022 00005634 89CA                <1> 	mov	edx, ecx
  3023                              <1> damb_2:
  3024 00005636 29D1                <1> 	sub	ecx, edx
  3025 00005638 51                  <1> 	push	ecx ; ***
  3026 00005639 89D1                <1> 	mov	ecx, edx
  3027                              <1> damb_3:		
  3028 0000563B 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate page
  3029                              <1> 				     ; set relevant bit to 1.
  3030                              <1> 				     ; set CF to the previous bit value	
  3031 0000563E FF05[B0330100]      <1> 	inc     dword [free_pages]   ; 1 page has been deallocated (X = X+1) 
  3032 00005644 49                  <1> 	dec	ecx
  3033 00005645 7404                <1> 	jz	short damb_4
  3034 00005647 FEC0                <1> 	inc	al
  3035 00005649 EBF0                <1> 	jmp	short damb_3
  3036                              <1> damb_4:	
  3037 0000564B 59                  <1> 	pop	ecx ; ***
  3038 0000564C 21C9                <1> 	and	ecx, ecx ; 0 ?
  3039 0000564E 741E                <1> 	jz	short damb_7
  3040                              <1> 	; 03/04/2016
  3041 00005650 B020                <1> 	mov	al, 32
  3042                              <1> damb_5:
  3043 00005652 83C304              <1> 	add	ebx, 4
  3044 00005655 39C1                <1> 	cmp	ecx, eax ; 32
  3045 00005657 7305                <1> 	jnb	short damb_6
  3046                              <1> 	; ECX < 32
  3047 00005659 28C0                <1> 	sub	al, al ; 0
  3048 0000565B 50                  <1> 	push	eax ; 0 ***
  3049 0000565C EBDD                <1> 	jmp	short damb_3
  3050                              <1> damb_6:
  3051 0000565E 0105[B0330100]      <1> 	add	[free_pages], eax ; [free_pages] = [free_pages] + 32
  3052 00005664 C703FFFFFFFF        <1> 	mov	dword [ebx], 0FFFFFFFFh ; set 32 bits
  3053 0000566A 29C1                <1> 	sub	ecx, eax ; 32
  3054 0000566C 75E4                <1> 	jnz	short damb_5
  3055                              <1> damb_7:
  3056 0000566E 5B                  <1> 	pop	ebx ; **
  3057 0000566F 5A                  <1> 	pop	edx ; *
  3058 00005670 C3                  <1> 	retn
  3059                              <1> 
  3060                              <1> direct_memory_access:
  3061                              <1> 	; 16/07/2016
  3062                              <1> 	; 12/07/2016 (TRDOS 386 = TRDOS v2.0)
  3063                              <1> 	; This processure will be called to map
  3064                              <1> 	; user's (ring 3) page tables to access phsical
  3065                              <1> 	; (flat/linear) memory addresses, directly (without
  3066                              <1> 	;  kernel's data transfer functions).
  3067                              <1> 	; 
  3068                              <1> 	; Purpose: Video memory access and shared memory access.
  3069                              <1> 	;
  3070                              <1> 	; INPUT -> 
  3071                              <1> 	;	EAX = Beginning address (physical).
  3072                              <1> 	;	ECX = Number of contiguous pages to be mapped.
  3073                              <1> 	; OUTPUT ->
  3074                              <1> 	;	User's page directory and pages tables
  3075                              <1> 	;	will be updated.
  3076                              <1> 	;	
  3077                              <1> 	;	If an old page table entry has valid page address, 
  3078                              <1> 	;	that page will be deallocated just before PTE will
  3079                              <1> 	;	be changed for direct (1 to 1) memory page access.
  3080                              <1> 	;
  3081                              <1> 	;	If old PTE value points to a swapped page,
  3082                              <1>         ;       that page (block) will be unlinked on swap disk. 
  3083                              <1> 	;
  3084                              <1> 	;	Newly allocated pages (except page tables) will not
  3085                              <1> 	;	be applied to Memory Allocation Table.
  3086                              <1> 	;	AVL bit 1 (PTE bit 10) of page table entry will be
  3087                              <1> 	;	used to indicate shared (direct) memory page; then,
  3088                              <1> 	;	this page will not be deallocated later during
  3089                              <1> 	;	process termination. (Memory Allocation Table and
  3090                              <1> 	;	free memory count will not be affected.
  3091                              <1> 	;	(Except deallocating page table's itself.)
  3092                              <1> 	;	
  3093                              <1> 	;      CF = 1 -> error (EAX = error code)
  3094                              <1> 	;      CF = 0 -> success (EAX = beginning address)
  3095                              <1> 	;
  3096                              <1> 	;; (Modified Registers -> none)
  3097                              <1> 	; Modified registers: ebp, edx, ecx, ebx, esi, edi	
  3098                              <1> 	;
  3099                              <1> 
  3100                              <1> 	;push	ebp
  3101                              <1> 	;push	ebx
  3102                              <1> 	;push	ecx
  3103                              <1> 	;push	edx
  3104 00005671 662500F0            <1> 	and	ax, PTE_A_CLEAR ; clear page offset
  3105 00005675 50                  <1> 	push	eax
  3106 00005676 89C5                <1> 	mov	ebp, eax
  3107                              <1> dmem_acc_0: 
  3108 00005678 89C3                <1> 	mov	ebx, eax
  3109 0000567A 81C300004000        <1> 	add	ebx, CORE
  3110 00005680 A1[384A0100]        <1> 	mov	eax, [u.pgdir] ; page dir address (physical)
  3111 00005685 E8FCF5FFFF          <1> 	call	get_pte
  3112                              <1> 		; EDX = Page table entry address (if CF=0)
  3113                              <1> 	        ;       Page directory entry address (if CF=1)
  3114                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  3115                              <1> 		; EAX = Page table entry value (page address)
  3116                              <1> 		;	CF = 1 -> PDE not present or invalid ? 	
  3117 0000568A 7324                <1> 	jnc	short dmem_acc_1
  3118                              <1> 	;
  3119 0000568C E8DAF4FFFF          <1> 	call	allocate_page
  3120 00005691 0F82A1000000        <1>         jc      dmem_acc_7  ; 'insufficient memory' error
  3121                              <1> 	;
  3122 00005697 E849F5FFFF          <1> 	call 	clear_page
  3123                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  3124 0000569C 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  3125                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  3126                              <1> 			   ; (user, writable, present page)	
  3127 0000569E 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  3128 000056A0 A1[384A0100]        <1> 	mov	eax, [u.pgdir]	
  3129 000056A5 E8DCF5FFFF          <1> 	call	get_pte
  3130 000056AA 0F8288000000        <1>         jc      dmem_acc_7 ; 'insufficient memory' error
  3131                              <1> dmem_acc_1:
  3132                              <1> 	; EAX = PTE value, EDX = PTE address
  3133 000056B0 A801                <1> 	test 	al, PTE_A_PRESENT
  3134 000056B2 750D                <1> 	jnz	short dmem_acc_2
  3135 000056B4 09C0                <1> 	or	eax, eax
  3136 000056B6 7468                <1> 	jz	short dmem_acc_6   ; Change PTE
  3137 000056B8 D1E8                <1> 	shr	eax, 1		; swap disk block (8 sectors) address
  3138                              <1> 	; unlink swap disk block
  3139 000056BA E834FBFFFF          <1> 	call	unlink_swap_block
  3140 000056BF EB5F                <1> 	jmp	short dmem_acc_6
  3141                              <1> 
  3142                              <1> dmem_acc_2:
  3143 000056C1 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3144                              <1> 				  ; (must be 1)
  3145 000056C3 7550                <1> 	jnz	short dmem_acc_4
  3146                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3147 000056C5 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3148                              <1> 				   ; as child's page ?
  3149 000056C9 7455                <1> 	jz	short dmem_acc_5 ; Change PTE but don't deallocate the page!
  3150                              <1> 
  3151                              <1> 	;push	edi
  3152                              <1> 	;push	esi
  3153                              <1> 
  3154 000056CB 51                  <1> 	push	ecx
  3155                              <1> 	;push	ebx
  3156 000056CC 8B1D[3C4A0100]      <1> 	mov	ebx, [u.ppgdir] ; parent's page dir address (physical)
  3157                              <1> 	
  3158                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3159 000056D2 89EF                <1> 	mov	edi, ebp
  3160 000056D4 C1EF16              <1> 	shr	edi, PAGE_D_SHIFT ; 22
  3161                              <1> 	; EDI = page directory entry index (0-1023)
  3162 000056D7 89EE                <1> 	mov	esi, ebp
  3163 000056D9 C1EE0C              <1> 	shr	esi, PAGE_SHIFT ; 12	
  3164 000056DC 81E6FF030000        <1> 	and	esi, PTE_MASK
  3165                              <1> 	; ESI = page table entry index (0-1023)
  3166                              <1> 
  3167 000056E2 66C1E702            <1> 	shl	di, 2 ; * 4
  3168 000056E6 01FB                <1> 	add	ebx, edi ; PDE offset (for the parent)
  3169 000056E8 8B0F                <1> 	mov	ecx, [edi]
  3170 000056EA F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
  3171 000056ED 7425                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3172 000056EF 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3173 000056F4 66C1E602            <1> 	shl	si, 2 ; *4 
  3174 000056F8 01CE                <1> 	add	esi, ecx ; PTE offset (for the parent)
  3175 000056FA 8B1E                <1> 	mov	ebx, [esi]
  3176 000056FC F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3177 000056FF 7413                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3178 00005701 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3179 00005705 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3180 0000570A 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3181 0000570C 7506                <1> 	jne	short dmem_acc_3	; not same page
  3182                              <1> 				; deallocate the child's page
  3183 0000570E 800E02              <1>         or      byte [esi], PTE_A_WRITE ; convert to writable page (parent)
  3184                              <1> 	;pop	ebx
  3185 00005711 59                  <1> 	pop	ecx
  3186 00005712 EB0C                <1> 	jmp	short dmem_acc_5
  3187                              <1> dmem_acc_3:
  3188                              <1> 	;pop	ebx
  3189 00005714 59                  <1> 	pop	ecx
  3190                              <1> dmem_acc_4:	
  3191 00005715 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
  3192 00005719 7505                <1> 	jnz	short dmem_acc_5   ; AVL bit 1 = 1, do not deallocate this page!
  3193                              <1> 	;
  3194                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3195 0000571B E829F6FFFF          <1> 	call	deallocate_page
  3196                              <1> dmem_acc_5:
  3197                              <1> 	;pop	esi
  3198                              <1> 	;pop	edi
  3199                              <1> dmem_acc_6:
  3200 00005720 89E8                <1> 	mov	eax, ebp ; physical page (offset=0) address
  3201                              <1> 	; EAX = memory page address
  3202                              <1> 	; EDX = PTE entry address (physical)
  3203 00005722 660D0704            <1> 	or	ax, PTE_A_PRESENT+PTE_A_USER+PTE_A_WRITE+PTE_SHARED
  3204                              <1> 			; present flag, bit 0 = 1
  3205                              <1> 			; user flag, bit 2 = 1	
  3206                              <1> 			; writable flag, bit 1 = 1
  3207                              <1> 			; direct memory access flag, bit 10 = 1
  3208                              <1> 			; (This page must not be deallocated!)
  3209 00005726 8902                <1> 	mov	[edx], eax  ; Update PTE value
  3210 00005728 49                  <1> 	dec	ecx ; remain count of contiguous pages
  3211 00005729 7414                <1> 	jz	short dmem_acc_8
  3212 0000572B 81C500100000        <1> 	add	ebp, PAGE_SIZE ; next virtual (=pysical) page address
  3213 00005731 89E8                <1> 	mov	eax, ebp
  3214 00005733 E940FFFFFF          <1>         jmp     dmem_acc_0
  3215                              <1> dmem_acc_7:  ; ERROR ! 
  3216 00005738 C7042404000000      <1> 	mov	dword [esp], ERR_MINOR_IM 
  3217                              <1> 		; Insufficient memory (minor) error!
  3218                              <1> 		; Major error = 0 (No protection fault)	
  3219                              <1> 	; cf = 1
  3220                              <1> dmem_acc_8:
  3221 0000573F 58                  <1> 	pop	eax
  3222                              <1> 	;pop	edx
  3223                              <1> 	;pop	ecx
  3224                              <1> 	;pop	ebx
  3225                              <1> 	;pop	ebp
  3226 00005740 C3                  <1> 	retn
  3227                              <1> 
  3228                              <1> deallocate_user_pages:
  3229                              <1> 	; 20/02/2017
  3230                              <1> 	; 19/02/2017 (TRDOS 386 = TRDOS v2.0)
  3231                              <1> 	;
  3232                              <1> 	; Deallocate virtually contiguous user pages (memory block)
  3233                              <1> 	; (caller: 'sysdalloc' system call)
  3234                              <1> 	;
  3235                              <1> 	; INPUT ->
  3236                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3237                              <1> 	;	ECX = byte count
  3238                              <1> 	;	[u.pgdir] = user's page directory
  3239                              <1> 	;	[u.ppdir] = parent's page directory
  3240                              <1> 	;
  3241                              <1> 	; OUTPUT ->
  3242                              <1> 	;    If CF = 0 	
  3243                              <1> 	;	EAX = Deallocated memory bytes
  3244                              <1> 	;	  (Even if shared or read only pages will not be
  3245                              <1> 	;	   deallocated on M.A.T., this byte count will be
  3246                              <1> 	;	   returned as virtually deallocated bytes; in fact
  3247                              <1> 	;	   virtually deallocated user pages * 4096.) 
  3248                              <1> 	;	EBX = Virtual address (as rounded up)
  3249                              <1> 	;    If CF = 1    	
  3250                              <1> 	;	EAX = 0 (there is not any deallocated pages)
  3251                              <1> 	;
  3252                              <1> 	; Note: Empty page tables will not be deallocated!!!
  3253                              <1> 	;     (they will be deallocated at process termination stage)
  3254                              <1> 	;
  3255                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3256                              <1> 	;
  3257 00005741 89DE                <1> 	mov	esi, ebx
  3258 00005743 89F7                <1> 	mov	edi, esi
  3259 00005745 01CF                <1> 	add	edi, ecx
  3260 00005747 81C6FF0F0000        <1> 	add	esi, PAGE_SIZE - 1  ; 4095 (round up)	
  3261 0000574D C1EE0C              <1> 	shr	esi, PAGE_SHIFT
  3262 00005750 C1EF0C              <1> 	shr	edi, PAGE_SHIFT
  3263 00005753 89F8                <1> 	mov	eax, edi ; end page
  3264 00005755 29F0                <1> 	sub	eax, esi ; end page - start page
  3265 00005757 0F86D6000000        <1> 	jna	da_u_pd_err  ; < 1
  3266 0000575D 89F3                <1> 	mov	ebx, esi
  3267 0000575F C1E30C              <1> 	shl	ebx, PAGE_SHIFT ; virtual address (as rounded up)
  3268 00005762 53                  <1> 	push	ebx ; *
  3269 00005763 89C1                <1> 	mov	ecx, eax ; page count
  3270 00005765 C1E00C              <1> 	shl	eax, PAGE_SHIFT ; byte count as adjusted
  3271 00005768 50                  <1> 	push	eax ; **
  3272 00005769 8B1D[384A0100]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3273 0000576F 81C600040000        <1>  	add	esi, CORE/PAGE_SIZE 
  3274 00005775 89F7                <1> 	mov	edi, esi
  3275 00005777 57                  <1> 	push	edi ; *** ; PTE index (of page directory)
  3276 00005778 C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3277 0000577B 89F2                <1> 	mov	edx, esi 
  3278                              <1> 	; EDX = PDE index
  3279 0000577D C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3280 00005780 01DE                <1> 	add	esi, ebx ; add page directory address
  3281                              <1> da_u_pd_1:
  3282 00005782 AD                  <1> 	lodsd
  3283                              <1> 	;
  3284 00005783 89F5                <1> 	mov	ebp, esi ; 20/02/2017
  3285                              <1> 	; EBP = next PDE address
  3286                              <1> 	;
  3287 00005785 A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3288 00005787 0F8493000000        <1> 	jz	da_u_pd_2	
  3289 0000578D 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3290                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3291 00005791 8B3C24              <1> 	mov	edi, [esp] ; ***
  3292                              <1> 	; EDI = PTE index (of complete page directory)
  3293 00005794 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry in the page table
  3294 0000579A C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3295 0000579D 89FE                <1> 	mov	esi, edi ; PTE offset in page table (0-4092)
  3296 0000579F 01C6                <1> 	add	esi, eax ; now, esi points to requested PTE
  3297                              <1> da_u_pt_0:
  3298 000057A1 AD                  <1> 	lodsd
  3299 000057A2 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
  3300 000057A4 743F                <1> 	jz	short da_u_pt_1
  3301                              <1> 	;
  3302 000057A6 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3303                              <1> 				  ; (must be 1)
  3304 000057A8 7549                <1> 	jnz	short da_u_pt_3
  3305                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3306 000057AA 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3307                              <1> 				   ; as child's page ?
  3308 000057AE 744E                <1> 	jz	short da_u_pt_4 ; Clear PTE but don't deallocate the page!
  3309                              <1> 	;
  3310                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3311                              <1> 	; EDX = page directory entry index (0-1023)
  3312 000057B0 52                  <1> 	push	edx ; ****
  3313                              <1> 	; EDI = page table entry offset (0-4092)
  3314 000057B1 8B1D[3C4A0100]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  3315 000057B7 66C1E202            <1> 	shl	dx, 2 ; *4 
  3316 000057BB 01D3                <1> 	add	ebx, edx ; PTE address,0 (for the parent)
  3317 000057BD 8B13                <1> 	mov	edx, [ebx] ; page table address
  3318 000057BF F6C201              <1> 	test	dl, PDE_A_PRESENT ; present (valid) or not ?
  3319 000057C2 742E                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3320 000057C4 6681E200F0          <1> 	and	dx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3321                              <1> 	; EDI = page table entry offset (0-4092)
  3322 000057C9 01D7                <1> 	add	edi, edx	; PTE address (for the parent)
  3323 000057CB 8B1F                <1> 	mov	ebx, [edi]
  3324 000057CD F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3325 000057D0 7420                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3326 000057D2 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3327 000057D6 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3328 000057DB 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3329 000057DD 7513                <1> 	jne	short da_u_pt_2	; not same page
  3330                              <1> 				; deallocate the child's page
  3331 000057DF 800F02              <1>         or      byte [edi], PTE_A_WRITE ; convert to writable page (parent)
  3332 000057E2 5A                  <1> 	pop	edx ; ****
  3333 000057E3 EB19                <1> 	jmp	short da_u_pt_4
  3334                              <1> da_u_pt_1:
  3335 000057E5 09C0                <1> 	or	eax, eax	; swapped page ?
  3336 000057E7 741C                <1> 	jz	short da_u_pt_5	; no
  3337                              <1> 				; yes
  3338 000057E9 D1E8                <1> 	shr	eax, 1
  3339 000057EB E803FAFFFF          <1> 	call	unlink_swap_block ; Deallocate swapped page block
  3340                              <1> 				  ; on the swap disk (or in file)
  3341 000057F0 EB13                <1> 	jmp	short da_u_pt_5
  3342                              <1> da_u_pt_2:
  3343 000057F2 5A                  <1> 	pop	edx ; ****
  3344                              <1> da_u_pt_3:
  3345 000057F3 66A90004            <1> 	test	ax, PTE_SHARED	; shared or direct memory access indicator
  3346 000057F7 7505                <1> 	jnz	short da_u_pt_4	; AVL bit 1 = 1, do not deallocate this page!
  3347                              <1> 	;
  3348                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3349 000057F9 E84BF5FFFF          <1> 	call	deallocate_page ; set the mem allocation bit of this page
  3350                              <1> da_u_pt_4:
  3351 000057FE C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
  3352                              <1> da_u_pt_5:
  3353 00005805 58                  <1> 	pop	eax ; *** PTE index (of page directory)
  3354 00005806 49                  <1> 	dec	ecx ; remain page count
  3355 00005807 7427                <1> 	jz	short da_u_pd_3
  3356 00005809 40                  <1> 	inc	eax ; next PTE
  3357 0000580A 50                  <1> 	push	eax ; *** ; save again
  3358 0000580B 89C7                <1> 	mov	edi, eax
  3359 0000580D 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry index in the page table
  3360 00005813 81FF00040000        <1> 	cmp	edi, PAGE_SIZE / 4 ; 1024
  3361 00005819 7305                <1> 	jnb	short da_u_pd_2
  3362 0000581B C1E702              <1> 	shl	edi, 2 ; convert index to dword offset
  3363 0000581E EB81                <1> 	jmp	short da_u_pt_0
  3364                              <1> da_u_pd_2:
  3365 00005820 42                  <1> 	inc	edx
  3366 00005821 81FA00040000        <1> 	cmp	edx, 1024
  3367 00005827 7307                <1> 	jnb	short da_u_pd_3
  3368 00005829 89EE                <1> 	mov	esi, ebp ; 20/02/2017
  3369 0000582B E952FFFFFF          <1> 	jmp	da_u_pd_1
  3370                              <1> da_u_pd_3:
  3371 00005830 58                  <1> 	pop	eax ; **
  3372 00005831 5B                  <1> 	pop	ebx ; *
  3373 00005832 C3                  <1> 	retn
  3374                              <1> 
  3375                              <1> da_u_pd_err:
  3376 00005833 31C0                <1> 	xor	eax, eax
  3377 00005835 F9                  <1> 	stc	
  3378 00005836 C3                  <1> 	retn
  3379                              <1> 
  3380                              <1> allocate_user_pages:
  3381                              <1> 	; 20/02/2017 (TRDOS 386 = TRDOS v2.0)
  3382                              <1> 	;
  3383                              <1> 	; Allocate physically contiguous user pages (memory block)
  3384                              <1> 	; (caller: 'sysalloc' system call)
  3385                              <1> 	;
  3386                              <1> 	; INPUT ->
  3387                              <1> 	;	EAX = PHYSICAL ADDRESS (beginning address)
  3388                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3389                              <1> 	;	ECX = byte count
  3390                              <1> 	;	[u.pgdir] = user's page directory
  3391                              <1> 	;	
  3392                              <1> 	;	Note: All addresses are (must be) already adjusted
  3393                              <1> 	;	to page	borders, otherwise, lower 12bits of addresses
  3394                              <1> 	;	and byte count would be truncated.
  3395                              <1> 	;
  3396                              <1> 	; OUTPUT ->
  3397                              <1> 	;	none
  3398                              <1> 	;
  3399                              <1> 	;	CF = 1 -> insufficient memory error
  3400                              <1> 	;
  3401                              <1> 	; Note: All pages will be allocated in physical page order 
  3402                              <1> 	;	from the beginning page address. 
  3403                              <1> 	;	* A new page table will be added to the page dir
  3404                              <1> 	;	  when the requested PDE is invalid.
  3405                              <1> 	;	* Those pages will not be added to swap queue
  3406                              <1> 	;	  because main purpose of this allocation is to
  3407                              <1> 	;	  set a direct memory access (DMA controller) buffer.
  3408                              <1> 	;	 (Swapping out a page in a DMA buffer would be wrong!)
  3409                              <1> 	;	* Previous content of page tables (PTEs) would be
  3410                              <1> 	;	  (should be) deallocated before entering this
  3411                              <1> 	;	  procedure. So, new page table entries (PTEs)
  3412                              <1> 	;	  directly will be written without checking
  3413                              <1> 	;	  their previous content.	
  3414                              <1> 	;	* Only solution to increase free memory by removing
  3415                              <1> 	;	  that non-swappable memory block is to terminate
  3416                              <1> 	;	  the process or to wait until the process will 
  3417                              <1> 	;	  deallocate that memory block as itself. ('sysdalloc')
  3418                              <1> 	;	  (No problem, if the process does not grab all of
  3419                              <1> 	;	  -very big amount of- free memory by using
  3420                              <1> 	;	  'sysalloc' system call!?)
  3421                              <1> 	;	  (Even if the process has grabbed all of free memory, 
  3422                              <1> 	;	  no problem if the process is not running in 
  3423                              <1> 	;	  multitasking mode. No problem in multitasking
  3424                              <1> 	;	  mode if there is not another process which is running
  3425                              <1> 	;	  or waiting or sleeping for an event as it's pages
  3426                              <1> 	;	  are swapped-out. But a new process can not start to
  3427                              <1> 	;	  run if all of free memory has beeen allocated 
  3428                              <1> 	;	  by running processes. Deallocation -'sysdalloc'- 
  3429                              <1> 	;	  or terminate a running process is needed 
  3430                              <1> 	;	  in order to run a new process.) 
  3431                              <1> 	;
  3432                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3433                              <1> 	;
  3434 00005837 89C5                <1> 	mov	ebp, eax ; physical address
  3435 00005839 89DE                <1> 	mov	esi, ebx
  3436 0000583B 81C600004000        <1> 	add	esi, CORE ; start of user's memory (4M) 
  3437 00005841 C1EE0C              <1> 	shr	esi, PAGE_SHIFT
  3438 00005844 C1E90C              <1> 	shr	ecx, PAGE_SHIFT
  3439 00005847 8B1D[384A0100]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3440 0000584D 89F7                <1> 	mov	edi, esi
  3441 0000584F 57                  <1> 	push	edi  ; * ; PTE index (in page directory)
  3442 00005850 C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3443 00005853 89F2                <1> 	mov	edx, esi 
  3444                              <1> 	; EDX = PDE index
  3445 00005855 C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3446 00005858 01DE                <1> 	add	esi, ebx ; add page directory address
  3447                              <1> a_u_pd_0:
  3448 0000585A AD                  <1> 	lodsd
  3449                              <1> 	;
  3450 0000585B 89F3                <1> 	mov	ebx, esi ; next PDE address
  3451                              <1> 	;
  3452 0000585D A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3453 0000585F 7515                <1> 	jnz	short a_u_pd_2
  3454                              <1> 	;
  3455                              <1> 	; empty PDE (it does not point to valid page table address)
  3456 00005861 E805F3FFFF          <1> 	call	allocate_page  ; (allocate a new page table)
  3457 00005866 7302                <1> 	jnc	short a_u_pd_1 ; OK... now, we have a new page table.
  3458                              <1> 	; cf = 1
  3459                              <1> 	; There is not a free memory page to allocate a new page table !!!
  3460 00005868 5E                  <1> 	pop	esi ; *
  3461 00005869 C3                  <1> 	retn	; return to 'sysalloc' with 'insufficient memory' error
  3462                              <1> 	;
  3463                              <1> a_u_pd_1: ; clear the new page table content 
  3464                              <1> 	; EAX = Physical (base) address of the new page table
  3465 0000586A 89C1                <1> 	mov	ecx, eax
  3466 0000586C E874F3FFFF          <1> 	call	clear_page ; Clear page content
  3467                              <1> 	;
  3468 00005871 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  3469                              <1> 		 ; set bit 0, bit 1 and bit 2 to 1
  3470                              <1> 		 ; (present, writable, user)
  3471 00005873 8946FC              <1> 	mov	[esi-4], eax
  3472                              <1> a_u_pd_2:
  3473 00005876 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3474                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3475 0000587A 8B3C24              <1> 	mov	edi, [esp] ; ***
  3476                              <1> 	; EDI = PTE index (of page directory)
  3477 0000587D 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry index in the page table	
  3478                              <1> 	; EBX = next PDE address
  3479 00005883 89FE                <1> 	mov	esi, edi ; PTE index in page table (0-1023)
  3480 00005885 C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3481 00005888 01C7                <1> 	add	edi, eax ; now, edi points to requested PTE
  3482                              <1> a_u_pt_0:
  3483 0000588A 89E8                <1> 	mov	eax, ebp ; physical address
  3484 0000588C AB                  <1> 	stosd
  3485 0000588D 49                  <1> 	dec	ecx ; remain page count
  3486 0000588E 741C                <1> 	jz	short a_u_pd_4
  3487 00005890 81C500100000        <1> 	add	ebp, PAGE_SIZE
  3488 00005896 46                  <1> 	inc	esi ; next PTE (index)
  3489 00005897 81FE00040000        <1> 	cmp	esi, PAGE_SIZE/4 ; 1024
  3490 0000589D 72EB                <1> 	jb	short a_u_pt_0
  3491                              <1> a_u_pd_3:
  3492 0000589F 42                  <1> 	inc	edx
  3493 000058A0 81FA00040000        <1> 	cmp	edx, 1024
  3494 000058A6 7304                <1> 	jnb	short a_u_pd_4
  3495 000058A8 89DE                <1> 	mov	esi, ebx ; the next PDE address
  3496 000058AA EBAE                <1> 	jmp	short a_u_pd_0
  3497                              <1> a_u_pd_4:
  3498 000058AC 5F                  <1> 	pop	edi ; *
  3499 000058AD C3                  <1> 	retn
  3500                              <1> 
  3501                              <1> ; /// End Of MEMORY MANAGEMENT FUNCTIONS ///
  3502                              <1> 
  3503                              <1> ;; Data:
  3504                              <1> 
  3505                              <1> ; 09/03/2015
  3506                              <1> ;swpq_count: dw 0 ; count of pages on the swap que
  3507                              <1> ;swp_drv:    dd 0 ; logical drive description table address of the swap drive/disk
  3508                              <1> ;swpd_size:  dd 0 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  3509                              <1> ;swpd_free:  dd 0 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  3510                              <1> ;swpd_next:  dd 0 ; next free page block
  3511                              <1> ;swpd_last:  dd 0 ; last swap page block
  2151                                  %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 000058AE 9C                  <1> 	pushfd
    30 000058AF 0E                  <1> 	push 	cs
    31 000058B0 E801000000          <1> 	call 	TIME_OF_DAY_1
    32 000058B5 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 000058B6 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   113                              <1> 	;
   114 000058BB 80FC08              <1> 	cmp	ah, (RTC_TBE-RTC_TB)/4	; CHECK IF COMMAND IN VALID RANGE (0-7)
   115 000058BE F5                  <1> 	cmc				; COMPLEMENT CARRY FOR ERROR EXIT
   116                              <1> 	; (*) jc short TIME_9		; EXIT WITH CARRY = 1 IF NOT VALID
   117 000058BF 721A                <1> 	jc	short _TIME_9 ; 29/05/2016
   118                              <1> 
   119 000058C1 1E                  <1> 	push	ds
   120 000058C2 56                  <1> 	push	esi
   121 000058C3 66BE1000            <1> 	mov	si, KDATA		; kernel data segment
   122 000058C7 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 000058C9 C0E402              <1> 	shl	ah, 2			; convert function to dword offset
   131 000058CC 0FB6F4              <1> 	movzx	esi, ah			; PLACE INTO ADDRESSING REGISTER
   132                              <1> 	;cli				; NO INTERRUPTS DURING TIME FUNCTIONS
   133 000058CF FF96[E1580000]      <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 000058D5 B400                <1> 	mov	ah, 0			; CLEAR (AH) TO ZERO
   137 000058D7 5E                  <1> 	pop	esi			; RECOVER USERS REGISTER
   138 000058D8 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 000058D9 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 000058DB 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 000058E0 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 000058E1 [01590000]          <1> 	dd	RTC_00			; 0 = READ CURRENT CLOCK COUNT
   181 000058E5 [14590000]          <1> 	dd	RTC_10			; 1 = SET CLOCK COUNT
   182 000058E9 [22590000]          <1> 	dd	RTC_20			; 2 = READ THE REAL TIME CLOCK TIME
   183 000058ED [51590000]          <1> 	dd	RTC_30			; 3 = SET REAL TIME CLOCK TIME
   184 000058F1 [93590000]          <1> 	dd	RTC_40			; 4 = READ THE REAL TIME CLOCK DATE
   185 000058F5 [C0590000]          <1> 	dd	RTC_50			; 5 = SET REAL TIME CLOCK DATE
   186 000058F9 [0D5A0000]          <1> 	dd	RTC_60			; 6 = SET THE REAL TIME CLOCK ALARM
   187 000058FD [605A0000]          <1> 	dd	RTC_70			; 7 = RESET ALARM
   188                              <1> 
   189                              <1> RTC_TBE	equ	$
   190                              <1> 
   191                              <1> RTC_00:				; READ TIME COUNT
   192 00005901 A0[2C340100]        <1> 	mov	al, [TIMER_OFL]		; GET THE OVERFLOW FLAG
   193 00005906 C605[2C340100]00    <1> 	mov	byte [TIMER_OFL], 0	; AND THEN RESET THE OVERFLOW FLAG
   194 0000590D 8B0D[28340100]      <1>         mov     ecx, [TIMER_LH]         ; GET COUNT OF TIME
   195 00005913 C3                  <1> 	retn
   196                              <1> 
   197                              <1> RTC_10:				; SET TIME COUNT
   198 00005914 890D[28340100]      <1>         mov     [TIMER_LH], ecx         ; SET TIME COUNT
   199 0000591A C605[2C340100]00    <1> 	mov	byte [TIMER_OFL], 0	; RESET OVERFLOW FLAG
   200 00005921 C3                  <1> 	retn				; RETURN WITH NO CARRY
   201                              <1> 
   202                              <1> RTC_20:				; GET RTC TIME
   203 00005922 E8EB010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   204 00005927 7227                <1> 	jc	short RTC_29		; EXIT IF ERROR (CY= 1)
   205                              <1> 
   206 00005929 B000                <1> 	mov	al, CMOS_SECONDS	; SET ADDRESS OF SECONDS
   207 0000592B E8FD010000          <1> 	call	CMOS_READ		; GET SECONDS
   208 00005930 88C6                <1> 	mov	dh, al			; SAVE
   209 00005932 B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   210 00005934 E8F4010000          <1> 	call	CMOS_READ		; READ CURRENT VALUE OF DSE BIT
   211 00005939 2401                <1> 	and	al, 00000001b		; MASK FOR VALID DSE BIT
   212 0000593B 88C2                <1> 	mov	dl, al			; SET [DL] TO ZERO FOR NO DSE BIT
   213 0000593D B002                <1> 	mov	al, CMOS_MINUTES	; SET ADDRESS OF MINUTES
   214 0000593F E8E9010000          <1> 	call	CMOS_READ		; GET MINUTES
   215 00005944 88C1                <1> 	mov	cl, al			; SAVE
   216 00005946 B004                <1>         mov     al, CMOS_HOURS          ; SET ADDRESS OF HOURS
   217 00005948 E8E0010000          <1> 	call	CMOS_READ		; GET HOURS
   218 0000594D 88C5                <1> 	mov	ch, al			; SAVE
   219 0000594F F8                  <1> 	clc				; SET CY= 0
   220                              <1> RTC_29:
   221 00005950 C3                  <1> 	retn				; RETURN WITH RESULT IN CARRY FLAG
   222                              <1> 
   223                              <1> RTC_30:				; SET RTC TIME
   224 00005951 E8BC010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   225 00005956 7305                <1> 	jnc	short RTC_35		; GO AROUND IF CLOCK OPERATING
   226 00005958 E817010000          <1> 	call	RTC_STA			; ELSE TRY INITIALIZING CLOCK
   227                              <1> RTC_35:
   228 0000595D 88F4                <1> 	mov	ah, dh			; GET TIME BYTE - SECONDS
   229 0000595F B000                <1> 	mov	al, CMOS_SECONDS	; ADDRESS SECONDS
   230 00005961 E8E0010000          <1> 	call	CMOS_WRITE		; UPDATE SECONDS
   231 00005966 88CC                <1> 	mov	ah, cl			; GET TIME BYTE - MINUTES
   232 00005968 B002                <1> 	mov	al, CMOS_MINUTES	; ADDRESS MINUTES
   233 0000596A E8D7010000          <1> 	call	CMOS_WRITE		; UPDATE MINUTES
   234 0000596F 88EC                <1> 	mov	ah, ch			; GET TIME BYTE - HOURS
   235 00005971 B004                <1> 	mov	al, CMOS_HOURS		; ADDRESS HOURS
   236 00005973 E8CE010000          <1> 	call	CMOS_WRITE		; UPDATE ADDRESS
   237                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   238                              <1> 	;mov	ah, al
   239 00005978 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   240 0000597C E8AC010000          <1> 	call	CMOS_READ		; READ CURRENT TIME
   241 00005981 2462                <1> 	and	al, 01100010b		; MASK FOR VALID BIT POSITIONS
   242 00005983 0C02                <1> 	or	al, 00000010b		; TURN ON 24 HOUR MODE
   243 00005985 80E201              <1> 	and	dl, 00000001b		; USE ONLY THE DSE BIT
   244 00005988 08D0                <1> 	or	al, dl			; GET DAY LIGHT SAVINGS TIME BIT (OSE)
   245 0000598A 86E0                <1> 	xchg	ah, al			; PLACE IN WORK REGISTER AND GET ADDRESS
   246 0000598C E8B5010000          <1> 	call	CMOS_WRITE		; SET NEW ALARM SITS
   247 00005991 F8                  <1> 	clc				; SET CY= 0
   248 00005992 C3                  <1> 	retn				; RETURN WITH CY= 0
   249                              <1> 
   250                              <1> RTC_40:				; GET RTC DATE
   251 00005993 E87A010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   252 00005998 7225                <1> 	jc	short RTC_49		; EXIT IF ERROR (CY= 1)
   253                              <1> 
   254 0000599A B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH
   255 0000599C E88C010000          <1> 	call	CMOS_READ		; READ DAY OF MONTH
   256 000059A1 88C2                <1> 	mov	dl, al			; SAVE
   257 000059A3 B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH
   258 000059A5 E883010000          <1> 	call	CMOS_READ		; READ MONTH
   259 000059AA 88C6                <1> 	mov	dh, al			; SAVE
   260 000059AC B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR
   261 000059AE E87A010000          <1> 	call	CMOS_READ		; READ YEAR
   262 000059B3 88C1                <1> 	mov	cl, al			; SAVE
   263 000059B5 B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY LOCATION
   264 000059B7 E871010000          <1> 	call	CMOS_READ		; GET CENTURY BYTE
   265 000059BC 88C5                <1> 	mov	ch, al			; SAVE
   266 000059BE F8                  <1> 	clc				; SET CY=0
   267                              <1> RTC_49:
   268 000059BF C3                  <1> 	retn				; RETURN WITH RESULTS IN CARRY FLAG
   269                              <1> 
   270                              <1> RTC_50:				; SET RTC DATE
   271 000059C0 E84D010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   272 000059C5 7305                <1> 	jnc	short RTC_55		; GO AROUND IF NO ERROR
   273 000059C7 E8A8000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   274                              <1> RTC_55:
   275 000059CC 66B80600            <1> 	mov	ax, CMOS_DAY_WEEK	; ADDRESS OF DAY OF WEEK BYTE
   276 000059D0 E871010000          <1> 	call	CMOS_WRITE		; LOAD ZEROS TO DAY OF WEEK
   277 000059D5 88D4                <1> 	mov	ah, dl			; GET DAY OF MONTH BYTE
   278 000059D7 B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH BYTE
   279 000059D9 E868010000          <1> 	call	CMOS_WRITE		; WRITE OF DAY OF MONTH REGISTER
   280 000059DE 88F4                <1> 	mov	ah, dh			; GET MONTH
   281 000059E0 B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH BYTE
   282 000059E2 E85F010000          <1> 	call	CMOS_WRITE		; WRITE MONTH REGISTER
   283 000059E7 88CC                <1> 	mov	ah, cl			; GET YEAR BYTE
   284 000059E9 B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR REGISTER
   285 000059EB E856010000          <1> 	call	CMOS_WRITE		; WRITE YEAR REGISTER
   286 000059F0 88EC                <1> 	mov	ah, ch			; GET CENTURY BYTE
   287 000059F2 B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY BYTE
   288 000059F4 E84D010000          <1> 	call	CMOS_WRITE		; WRITE CENTURY LOCATION
   289                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   290                              <1> 	;mov	ah, al
   291 000059F9 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   292 000059FD E82B010000          <1> 	call	CMOS_READ		; READ WIRRENT SETTINGS
   293 00005A02 247F                <1> 	and	al, 07Fh		; CLEAR 'SET BIT'
   294 00005A04 86E0                <1> 	xchg	ah, al			; MOVE TO WORK REGISTER
   295 00005A06 E83B010000          <1> 	call	CMOS_WRITE		; AND START CLOCK UPDATING
   296 00005A0B F8                  <1> 	clc				; SET CY= 0
   297 00005A0C C3                  <1> 	retn				; RETURN CY=0
   298                              <1> 
   299                              <1> RTC_60:				; SET RTC ALARM
   300 00005A0D B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM
   301 00005A0F E819010000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   302 00005A14 A820                <1> 	test	al, 20h			; CHECK FOR ALARM ALREADY ENABLED
   303 00005A16 F9                  <1> 	stc				; SET CARRY IN CASE OF ERROR
   304 00005A17 7542                <1> 	jnz	short RTC_69		; ERROR EXIT IF ALARM SET
   305 00005A19 E8F4000000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   306 00005A1E 7305                <1> 	jnc	short RTC_65		; SKIP INITIALIZATION IF NO ERROR
   307 00005A20 E84F000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   308                              <1> RTC_65:	
   309 00005A25 88F4                <1> 	mov	ah, dh			; GET SECONDS BYTE
   310 00005A27 B001                <1> 	mov	al, CMOS_SEC_ALARM	; ADDRESS THE SECONDS ALARM REGISTER
   311 00005A29 E818010000          <1> 	call	CMOS_WRITE		; INSERT SECONDS
   312 00005A2E 88CC                <1> 	mov	ah, cl			; GET MINUTES PARAMETER
   313 00005A30 B003                <1> 	mov	al, CMOS_MIN_ALARM	; ADDRESS MINUTES ALARM REGISTER
   314 00005A32 E80F010000          <1> 	call	CMOS_WRITE		; INSERT MINUTES
   315 00005A37 88EC                <1> 	mov	ah, ch			; GET HOURS PARAMETER
   316 00005A39 B005                <1> 	mov	al, CMOS_HR_ALARM	; ADDRESS HOUR ALARM REGISTER
   317 00005A3B E806010000          <1> 	call	CMOS_WRITE		; INSERT HOURS
   318 00005A40 E4A1                <1> 	in	al, INTB01		; READ SECOND INTERRUPT MASK REGISTER
   319 00005A42 24FE                <1> 	and	al, 0FEh		; ENABLE ALARM TIMER BIT (CY= 0)
   320 00005A44 E6A1                <1> 	out	INTB01, al		; WRITE UPDATED MASK
   321                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   322                              <1> 	;mov	ah, al
   323 00005A46 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   324 00005A4A E8DE000000          <1> 	call	CMOS_READ		; READ CURRENT ALARM REGISTER
   325 00005A4F 247F                <1> 	and	al, 07Fh		; ENSURE SET BIT TURNED OFF
   326 00005A51 0C20                <1> 	or	al, 20h			; TURN ON ALARM ENABLE
   327 00005A53 86E0                <1> 	xchg	ah, al			; MOVE MASK TO OUTPUT REGISTER
   328 00005A55 E8EC000000          <1> 	call	CMOS_WRITE		; WRITE NEW ALARM MASK
   329 00005A5A F8                  <1> 	clc				; SET CY= 0
   330                              <1> RTC_69:
   331 00005A5B 66B80000            <1> 	mov	ax, 0			; CLEAR AX REGISTER
   332 00005A5F 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 00005A60 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257	; ADDRESS ALARM REGISTER (TO BOTH AH,AL)
   338 00005A64 E8C4000000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   339 00005A69 2457                <1> 	and	al, 57h			; TURN OFF ALARM ENABLE
   340 00005A6B 86E0                <1> 	xchg	ah, al			; SAVE DATA AND RECOVER ADDRESS
   341 00005A6D E8D4000000          <1> 	call	CMOS_WRITE		; RESTORE NEW VALUE
   342 00005A72 F8                  <1> 	clc				; SET CY= 0
   343 00005A73 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 00005A74 66B80A26            <1> 	mov	ax, (26h*100h)+CMOS_REG_A
   349 00005A78 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 00005A7D 66B80B82            <1> 	mov	ax, (82h*100h)+CMOS_REG_B
   353 00005A81 E8C0000000          <1> 	call	CMOS_WRITE		; AND 24 HOUR MODE TO REGISTER B
   354 00005A86 B00C                <1> 	mov	al, CMOS_REG_C		; ADDRESS REGISTER C
   355 00005A88 E8A0000000          <1> 	call	CMOS_READ		; READ REGISTER C TO INITIALIZE
   356 00005A8D B00D                <1> 	mov	al, CMOS_REG_D		; ADDRESS REGISTER D
   357 00005A8F E899000000          <1> 	call	CMOS_READ		; READ REGISTER D TO INITIALIZE
   358 00005A94 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 00005A95 1E                  <1> 	push	ds			; LEAVE INTERRUPTS DISABLED
   380 00005A96 50                  <1> 	push	eax			; SAVE REGISTERS
   381 00005A97 57                  <1> 	push	edi
   382                              <1> RTC_I_1:				; CHECK FOR SECOND INTERRUPT
   383 00005A98 66B88C8B            <1> 	mov	ax, 256*(CMOS_REG_B+NMI)+CMOS_REG_C+NMI ; ALARM AND STATUS
   384 00005A9C E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM FLAG MASK ADDRESS
   385 00005A9E 90                  <1> 	nop				; I/O DELAY
   386 00005A9F EB00                <1> 	jmp	short $+2
   387 00005AA1 E471                <1> 	in	al, CMOS_DATA		; READ AND RESET INTERRUPT REQUEST FLAGS
   388 00005AA3 A860                <1> 	test	al, 01100000b		; CHECK FOR EITHER INTERRUPT PENDING
   389 00005AA5 745D                <1> 	jz	short	RTC_I_9		; EXIT IF NOT A VALID RTC INTERRUPT
   390                              <1> 
   391 00005AA7 86E0                <1> 	xchg	ah, al			; SAVE FLAGS AND GET ENABLE ADDRESS
   392 00005AA9 E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM ENABLE MASK ADDRESS
   393 00005AAB 90                  <1> 	nop				; I/O DELAY
   394 00005AAC EB00                <1> 	jmp	short $+2	
   395 00005AAE E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ALARM ENABLE MASK
   396 00005AB0 20E0                <1> 	and	al, ah			; ALLOW ONLY SOURCES THAT ARE ENABLED
   397 00005AB2 A840                <1> 	test	al, 01000000b		; CHECK FOR PERIODIC INTERRUPT
   398 00005AB4 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 00005AB6 66BF1000            <1> 	mov	di, KDATA		; kernel data segment
   403 00005ABA 8EDF                <1> 	mov	ds, di
   404                              <1> 	
   405 00005ABC 812D[20340100]D003- <1> 	sub	dword [RTC_LH], 976	; DECREMENT COUNT BY 1/1024
   405 00005AC4 0000                <1>
   406 00005AC6 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 00005AC8 6650                <1> 	push	ax			; SAVE INTERRUPT FLAG MASK
   411 00005ACA 66B88B8B            <1> 	mov	ax, 257*(CMOS_REG_B+NMI) ; INTERRUPT ENABLE REGISTER
   412 00005ACE E670                <1> 	out	CMOS_PORT, al		; WRITE ADDRESS TO CMOS CLOCK
   413 00005AD0 90                  <1> 	nop				; I/O DELAY
   414 00005AD1 EB00                <1> 	jmp	short $+2
   415 00005AD3 E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ENABLES
   416 00005AD5 24BF                <1> 	and	al, 0BFh		; TURN OFF PIE
   417 00005AD7 86C4                <1> 	xchg	al, ah			; GET CMOS ADDRESS AND SAVE VALUE
   418 00005AD9 E670                <1> 	out	CMOS_PORT, al		; ADDRESS REGISTER B
   419 00005ADB 86C4                <1> 	xchg	al, ah			; GET NEW INTERRUPT ENABLE MASK
   420 00005ADD E671                <1> 	out	CMOS_DATA, al		; SET MASK IN INTERRUPT ENABLE REGISTER
   421 00005ADF C605[24340100]00    <1> 	mov	byte [RTC_WAIT_FLAG], 0	; SET FUNCTION ACTIVE FLAG OFF
   422 00005AE6 8B3D[25340100]      <1> 	mov	edi, [USER_FLAG]	; SET UP (DS:DI) TO POINT TO USER FLAG
   423 00005AEC C60780              <1> 	mov	byte [edi], 80h		; TURN ON USERS FLAG
   424 00005AEF 6658                <1> 	pop	ax			; GET INTERRUPT SOURCE BACK
   425                              <1> RTC_I_5:
   426 00005AF1 A820                <1> 	test	al, 00100000b		; TEST FOR ALARM INTERRUPT
   427 00005AF3 740D                <1> 	jz	short RTC_I_7		; SKIP USER INTERRUPT CALL IF NOT ALARM
   428                              <1> 
   429 00005AF5 B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   430 00005AF7 E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   431 00005AF9 FB                  <1> 	sti				; INTERRUPTS BACK ON NOW
   432 00005AFA 52                  <1> 	push	edx
   433 00005AFB E858900000          <1> 	call	INT4Ah			; TRANSFER TO USER ROUTINE
   434 00005B00 5A                  <1> 	pop	edx
   435 00005B01 FA                  <1> 	cli				; BLOCK INTERRUPT FOR RETRY
   436                              <1> RTC_I_7:				; RESTART ROUTINE TO HANDLE DELAYED
   437 00005B02 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 00005B04 B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   441 00005B06 E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   442 00005B08 B020                <1> 	mov	al, EOI			; END OF INTERRUPT MASK TO 8259 - 2
   443 00005B0A E6A0                <1> 	out	INTB00, al		; TO 8259 - 2
   444 00005B0C E620                <1> 	out	INTA00,	al		; TO 8259 - 1
   445 00005B0E 5F                  <1> 	pop	edi			; RESTORE REGISTERS
   446 00005B0F 58                  <1> 	pop	eax
   447 00005B10 1F                  <1> 	pop	ds
   448 00005B11 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 00005B12 51                  <1> 	push	ecx
   456                              <1> 
   457                              <1> 	; 29/05/2016
   458 00005B13 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 00005B18 B00A                <1> 	mov	al, CMOS_REG_A		; ADDRESS STATUS REGISTER A
   467 00005B1A FA                  <1> 	cli				; NO TIMER INTERRUPTS DURING UPDATES
   468 00005B1B E80D000000          <1> 	call	CMOS_READ		; READ UPDATE IN PROCESS FLAG
   469 00005B20 A880                <1> 	test	al, 80h			; IF UIP BIT IS ON ( CANNOT READ TIME )
   470 00005B22 7406                <1> 	jz	short UPD_90		; EXIT WITH CY= 0 IF CAN READ CLOCK NOW
   471 00005B24 FB                  <1> 	sti				; ALLOW INTERRUPTS WHILE WAITING
   472 00005B25 E2F1                <1> 	loop	UPD_10			; LOOP TILL READY OR TIMEOUT
   473 00005B27 31C0                <1> 	xor	eax, eax		; CLEAR RESULTS IF ERROR
   474                              <1> 		; xor ax, ax
   475 00005B29 F9                  <1> 	stc				; SET CARRY FOR ERROR
   476                              <1> UPD_90:
   477 00005B2A 59                  <1> 	pop	ecx			; RESTORE CALLERS REGISTER
   478 00005B2B FA                  <1> 	cli				; INTERRUPTS OFF DURING SET
   479 00005B2C 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 00005B2D 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   503 00005B2E D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   504 00005B30 F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   505 00005B31 D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   506 00005B33 FA                  <1> 	cli				; DISABLE INTERRUPTS
   507 00005B34 E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   508                              <1> 	; 29/05/2016
   509                              <1> 	;nop				; I/O DELAY
   510 00005B36 E6EB                <1> 	out	0ebh,al	; NEWIODELAY ; AWARD BIOS 1999, ATIME.ASM
   511                              <1> 	;
   512 00005B38 E471                <1> 	in	al, CMOS_DATA		; READ THE REQUESTED CMOS LOCATION
   513 00005B3A 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 00005B3C 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 00005B3E D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   519 00005B40 E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   520 00005B42 6658                <1> 	pop	ax			; RESTORE (AH) AND (AL), CMOS BYTE
   521 00005B44 9D                  <1> 	popf	
   522 00005B45 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 00005B46 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   544 00005B47 6650                <1> 	push	ax			; SAVE WORK REGISTER VALUES
   545 00005B49 D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   546 00005B4B F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   547 00005B4C D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   548 00005B4E FA                  <1> 	cli				; DISABLE INTERRUPTS
   549 00005B4F E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   550 00005B51 88E0                <1> 	mov	al, ah			; GET THE DATA BYTE TO WRITE
   551 00005B53 E671                <1> 	out	CMOS_DATA, al		; PLACE IN REQUESTED CMOS LOCATION
   552 00005B55 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 00005B57 D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   555 00005B59 E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   556 00005B5B 90                  <1> 	nop				; I/O DELAY
   557 00005B5C E471                <1> 	in	al, CMOS_DATA		; OPEN STANDBY LATCH
   558 00005B5E 6658                <1> 	pop	ax			; RESTORE WORK REGISTERS
   559 00005B60 9D                  <1> 	popf
   560 00005B61 C3                  <1> 	retn
   561                              <1> 
   562                              <1> ; /// End Of TIMER FUNCTIONS ///
  2152                                  %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: 19/02/2017
     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> ; 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> _reserved1 equ 37 ;; TRDOS 386 (19/05/2016)
   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> 			  ; 'insfufficient 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> ; 18/05/2016
   213                              <1> ERR_MISC	   equ 27 ; miscellaneous/other errors
   214                              <1> ; 15/10/2016
   215                              <1> ; TRDOS 8086 -> TRDOS 386 (0Bh -> 28)
   216                              <1> ERR_INV_FORMAT	   equ 28 ; 'invalid format !' error
   217                              <1> ; TRDOS 8086 -> TRDOS 386 (0Dh -> 29)
   218                              <1> ERR_INV_DATA	   equ 29 ; 'invalid data !' error
   219                              <1> ; TRDOS 8086 -> TRDOS 386 (0Eh -> 20)
   220                              <1> ERR_ZERO_LENGTH	   equ 20  ; 'zero length !' error 	
   221                              <1> ; TRDOS 8086 -> TRDOS 386 (15h -> 17, 1Dh -> 18, 1Eh -> 17) 	
   222                              <1> ERR_DRV_NR_READ	   equ 17 ; 'drive not ready or read error !'
   223                              <1> ERR_DRV_NR_WRITE   equ 18 ; 'drive not ready or write error !'		
   224                              <1> ; 15/10/2016
   225                              <1> ERR_INV_PATH_NAME  equ 19 ; 'bad path name !' error
   226                              <1> ERR_BAD_CMD_ARG	   equ  1 ; 'bad command argument !' ; TRDOS 8086
   227                              <1> ERR_INV_FNUMBER	   equ  1 ; 'invalid function number !' ; TRDOS 8086
   228                              <1> ERR_BIG_FILE	   equ  8 ; 'big file & out of memory ! ; TRDOS 8086 	
   229                              <1> ERR_BIG_DATA	   equ  8 ; 'big data & out of memory ! ; TRDOS 8086
   230                              <1> ERR_CLUSTER	   equ 35 ; 'cluster not available !' ; TRDOS 8086
   231                              <1> ERR_OUT_OF_MEMORY  equ  4 ; 'out of memory !'
   232                              <1> 			  ; 'insufficient memory !'
   233                              <1> ERR_P_VIOLATION	   equ	6 ; 'protection violation !'
   234                              <1> ERR_PAGE_FAULT	   equ 224 ;'page fault !' ;0E0h						 
   235                              <1> ERR_SWP_DISK_READ  	   equ 40
   236                              <1> ERR_SWP_DISK_NOT_PRESENT   equ 41
   237                              <1> ERR_SWP_SECTOR_NOT_PRESENT equ 42
   238                              <1> ERR_SWP_NO_FREE_SPACE      equ 43
   239                              <1> ERR_SWP_DISK_WRITE         equ 44
   240                              <1> ERR_SWP_NO_PAGE_TO_SWAP    equ 45
   241                              <1> 
   242                              <1> ; 26/08/2015
   243                              <1> ; 24/07/2015
   244                              <1> ; 24/06/2015
   245                              <1> MAX_ARG_LEN	   equ 256 ; max. length of sys exec arguments
   246                              <1> ; 01/07/2015
   247                              <1> MAX_MSG_LEN	   equ 255 ; max. msg length for 'sysmsg'
   248                              <1> ;	
   249                              <1> ; 06/10/2016
   250                              <1> OPENFILES	   equ 10  ; max. number of open files (system)
   251                              <1> ; 07/10/2016
   252                              <1> ;NUMOFDEVICES	   equ 20  ; max. num of available devices (sys)
   253                              <1> 			 		
  2153                                  %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
  2154                                  %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 00005B62 B036                <1> 	mov	al, 00110110b ; 36h
    30 00005B64 E643                <1>  	out	43h, al
    31 00005B66 31C0                <1> 	xor	eax, eax  ; sub	al, al ; 0
    32 00005B68 E640                <1> 	out	40h, al ; LB
    33 00005B6A 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 00005B6C BF00010900          <1> 	mov	edi, Logical_DOSDisks
    39 00005B71 B980060000          <1> 	mov	ecx, 6656/4 ; 26*256 = 6656 bytes
    40 00005B76 F3AB                <1> 	rep	stosd ; 1664 times 4 bytes
    41                              <1> 
    42 00005B78 B83F3A2F00          <1> 	mov	eax, '?:/'
    43 00005B7D A3[6F340100]        <1> 	mov	[Current_Dir_Drv], eax
    44                              <1> 
    45                              <1> 	; Logical DRV INIT (only for hard disks)
    46 00005B82 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 00005B87 BE00010900          <1> 	mov 	esi, Logical_DOSDisks
    53 00005B8C B001                <1> 	mov 	al, 1 ; Initialization sign (invalid_fd_parameter)
    54 00005B8E 83C67E              <1> 	add 	esi, LD_MediaChanged ; Media Change Status = 1 (init needed)
    55 00005B91 8806                <1> 	mov 	[esi], al ; A:
    56 00005B93 81C600010000        <1> 	add 	esi, 100h 
    57 00005B99 8806                <1> 	mov 	[esi], al ; B: 
    58                              <1>            
    59                              <1> _current_drive_bootdisk:
    60 00005B9B 8A15[12FA0000]      <1> 	mov 	dl, [boot_drv] ; physical drive number
    61 00005BA1 80FAFF              <1> 	cmp 	dl, 0FFh
    62 00005BA4 740A                <1> 	je 	short _last_dos_diskno_check
    63                              <1> _boot_drive_check:
    64 00005BA6 80FA80              <1> 	cmp 	dl, 80h
    65 00005BA9 7218                <1> 	jb 	short _current_drive_a
    66 00005BAB 80EA7E              <1> 	sub 	dl, 7Eh ; C = 2 , D = 3
    67 00005BAE EB13                <1> 	jmp 	short _current_drive_a 
    68                              <1> 
    69                              <1> _last_dos_diskno_check:
    70 00005BB0 8A15[14F00000]      <1> 	mov 	dl, [Last_DOS_DiskNo]
    71 00005BB6 80FA02              <1> 	cmp 	dl, 2
    72 00005BB9 7706                <1> 	ja 	short _current_drive_c
    73 00005BBB 7406                <1> 	je 	short _current_drive_a
    74 00005BBD 30D2                <1> 	xor 	dl, dl ; A:
    75 00005BBF EB02                <1> 	jmp 	short _current_drive_a
    76                              <1> 
    77                              <1> _current_drive_c:
    78 00005BC1 B202                <1> 	mov 	dl, 2 ; C:
    79                              <1> 
    80                              <1> _current_drive_a:
    81 00005BC3 8815[13FA0000]      <1> 	mov	[drv], dl
    82 00005BC9 BE[16F00000]        <1>         mov     esi, msg_CRLF_temp
    83 00005BCE E89E000000          <1> 	call 	print_msg
    84                              <1> 
    85 00005BD3 8A15[13FA0000]      <1> 	mov	dl, [drv]
    86 00005BD9 E893090000          <1> 	call 	change_current_drive
    87 00005BDE 730C                <1> 	jnc 	short _start_mainprog
    88                              <1> 
    89                              <1> _drv_not_ready_error: 
    90 00005BE0 BE[D1F20000]        <1> 	mov 	esi, msgl_drv_not_ready
    91 00005BE5 E887000000          <1> 	call 	print_msg
    92 00005BEA 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 00005BEC 66B80100            <1> 	mov	ax, 1
   105 00005BF0 A2[334A0100]        <1> 	mov	[u.uno], al
   106 00005BF5 66A3[CE490100]      <1> 	mov	[mpid], ax
   107 00005BFB 66A3[A0460100]      <1> 	mov	[p.pid], ax
   108 00005C01 A2[30470100]        <1> 	mov	[p.stat], al
   109 00005C06 C605[284A0100]04    <1> 	mov	byte [u.quant], time_count  ; 07/01/2017
   110                              <1> 	;
   111 00005C0D A1[A8330100]        <1> 	mov	eax, [k_page_dir]
   112 00005C12 A3[384A0100]        <1> 	mov	[u.pgdir], eax ; reset
   113                              <1> 	;
   114 00005C17 E84FEFFFFF          <1> 	call	allocate_page
   115 00005C1C 0F82A3000000        <1> 	jc	panic
   116 00005C22 A3[344A0100]        <1> 	mov	[u.upage], eax ; user structure page	
   117 00005C27 A3[40470100]        <1> 	mov	[p.upage], eax
   118 00005C2C E8B4EFFFFF          <1> 	call	clear_page
   119                              <1> 	;
   120                              <1> 	; 24/08/2015
   121 00005C31 FE0D[DB490100]      <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 00005C37 BF00300900          <1> 	mov	edi, Env_Page ; 93000h
   126 00005C3C B980000000          <1> 	mov	ecx, Env_Page_Size / 4 	; 512/4  (4096/4)				 	  		 	  
   127 00005C41 31C0                <1> 	xor	eax, eax
   128 00005C43 F3AB                <1> 	rep	stosd
   129                              <1> 
   130                              <1> 	; 14/04/2016
   131 00005C45 E8C3320000          <1>  	call	mainprog_startup_configuration
   132                              <1> 
   133 00005C4A E8630A0000          <1>         call    dos_prompt
   134                              <1>               
   135                              <1> _end_of_mainprog:
   136 00005C4F BE[16F00000]        <1>         mov     esi, msg_CRLF_temp
   137 00005C54 E818000000          <1> 	call 	print_msg
   138 00005C59 BE[1CF00000]        <1> 	mov 	esi, mainprog_Version
   139 00005C5E E80E000000          <1> 	call 	print_msg
   140                              <1> 	; 24/01/2016
   141 00005C63 28E4                <1> 	sub	ah, ah
   142 00005C65 E89DAFFFFF          <1> 	call	int16h ; call getch
   143 00005C6A E97DB4FFFF          <1> 	jmp	cpu_reset
   144                              <1> 
   145 00005C6F 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 00005C71 8A3D[D6330100]      <1> 	mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   156                              <1> 	;mov	bl, 07h ; Black background, light gray forecolor
   157                              <1> 
   158 00005C77 AC                  <1> 	lodsb
   159                              <1> pmsg1:
   160 00005C78 56                  <1> 	push 	esi
   161                              <1> 	;mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   162 00005C79 B307                <1> 	mov	bl, 07h ; Black background, light gray forecolor
   163 00005C7B E823C0FFFF          <1> 	call 	_write_tty
   164 00005C80 5E                  <1> 	pop	esi
   165 00005C81 AC                  <1> 	lodsb
   166 00005C82 20C0                <1> 	and 	al, al
   167 00005C84 75F2                <1> 	jnz 	short pmsg1
   168 00005C86 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 00005C87 0FB61D[D6330100]    <1> 	movzx	ebx, byte [ACTIVE_PAGE] ; video page number (0 to 7)
   176 00005C8E 8AA3[F3FB0000]      <1> 	mov 	ah, [ebx+vmode] ; default = 03h (80x25 text)
   177 00005C94 80FC04              <1> 	cmp	ah, 4
   178 00005C97 7205                <1> 	jb	short cls1
   179 00005C99 80FC07              <1> 	cmp	ah, 7
   180 00005C9C 7526                <1> 	jne	short vga_clear
   181                              <1> cls1:
   182                              <1> 	;mov	bh, bl
   183                              <1> 	;mov	bl, 7
   184 00005C9E 3A25[E2FB0000]      <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 00005CA4 0F8503C0FFFF        <1> 	jne	set_mode_3
   190                              <1> cls2:
   191 00005CAA 88DF                <1> 	mov	bh, bl ; video page (0 to 7)
   192 00005CAC B307                <1> 	mov	bl, 07h ; attribute to be used on blanked line
   193 00005CAE 28C0                <1> 	sub 	al, al ; 0 =  entire window
   194 00005CB0 6631C9              <1> 	xor 	cx, cx
   195 00005CB3 66BA4F18            <1> 	mov 	dx, 184Fh
   196 00005CB7 E83FBDFFFF          <1> 	call	_scroll_up ; 24/01/2016
   197                              <1> 	;
   198                              <1> 	;mov	bh, [ACTIVE_PAGE] ; video page number (0 to 7)
   199 00005CBC 6631D2              <1> 	xor 	dx, dx
   200 00005CBF E875C0FFFF          <1> 	call	_set_cpos ; 24/01/2016 
   201                              <1> 	;retn
   202                              <1> vga_clear:
   203 00005CC4 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 00005CC5 BE[9A020100]        <1> 	mov 	esi, panic_msg
   210 00005CCA E8A2FFFFFF          <1> 	call 	print_msg
   211                              <1> key_to_reboot:
   212                              <1>         ; 24/01/2016
   213 00005CCF 28E4                <1>         sub     ah, ah
   214 00005CD1 E831AFFFFF          <1>         call    int16h ; call   getch
   215                              <1>         ; wait for a character from the current tty
   216                              <1> 	;
   217 00005CD6 B00A                <1> 	mov	al, 0Ah
   218 00005CD8 8A3D[D6330100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
   219 00005CDE B307                <1> 	mov	bl, 07h ; Black background, 
   220                              <1> 			; light gray forecolor
   221 00005CE0 E8BEBFFFFF          <1> 	call 	_write_tty
   222 00005CE5 E902B4FFFF          <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 00005CEA 66833D[2A4A0100]00  <1> 	cmp 	word [u.intr], 0
   234 00005CF2 7645                <1> 	jna 	short cbrk4
   235                              <1> cbrk0:
   236                              <1> 	; 12/11/2015
   237                              <1> 	; 06/12/2013
   238 00005CF4 66833D[2C4A0100]00  <1> 	cmp 	word [u.quit], 0
   239 00005CFC 743B                <1> 	jz	short cbrk4
   240                              <1> 	;
   241                              <1> 	; 20/09/2013	
   242 00005CFE 6650                <1> 	push 	ax
   243 00005D00 A0[D6330100]        <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 00005D05 3C08                <1> 	cmp	al, 8 ; serial port tty nums > 7
   252 00005D07 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 00005D09 52                  <1> 	push	edx
   264 00005D0A 0FB615[334A0100]    <1> 	movzx	edx, byte [u.uno]
   265 00005D11 3A82[FF460100]      <1> 	cmp     al, [edx+p.ttyc-1] ; console tty (rw)
   266 00005D17 5A                  <1> 	pop	edx
   267 00005D18 7412                <1> 	je	short cbrk2
   268                              <1> cbrk1:
   269 00005D1A FEC0                <1> 	inc 	al  ; [u.ttyp] : 1 based tty number
   270                              <1> 	; 06/12/2013
   271 00005D1C 3A05[144A0100]      <1> 	cmp	al, [u.ttyp] ; recent open tty (r)
   272 00005D22 7408                <1> 	je	short cbrk2	
   273 00005D24 3A05[154A0100]      <1>         cmp     al, [u.ttyp+1] ; recent open tty (w)
   274 00005D2A 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 00005D2C 6631C0              <1> 	xor	ax, ax ; 0
   282 00005D2F 6648                <1> 	dec	ax
   283                              <1> 	; 0FFFFh = 'ctrl+brk' keystroke
   284 00005D31 66A3[2C4A0100]      <1> 	mov	[u.quit], ax
   285                              <1> cbrk3:
   286 00005D37 6658                <1> 	pop	ax
   287                              <1> cbrk4:
   288 00005D39 C3                  <1> 	retn
  2155                                  %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 00005D3A 0FB60D[44340100]    <1> 	movzx	ecx, byte [HF_NUM] ; number of fixed disks
    25 00005D41 80F901              <1> 	cmp	cl, 1
    26 00005D44 7301                <1> 	jnb	short load_hd_partition_tables
    27                              <1> 	; No hard disks
    28 00005D46 C3                  <1> 	retn
    29                              <1> load_hd_partition_tables:
    30 00005D47 8B35[48340100]      <1> 	mov	esi, [HDPM_TBL_VEC] ; primary master disk FDPT
    31 00005D4D BF[6E380100]        <1> 	mov 	edi, PTable_hd0
    32 00005D52 B280                <1> 	mov 	dl, 80h
    33                              <1> load_next_hd_partition_table:
    34 00005D54 51                  <1> 	push	ecx
    35 00005D55 57                  <1> 	push	edi
    36 00005D56 56                  <1> 	push	esi ; FDPT (+ DPTE) address
    37 00005D57 8A4614              <1> 	mov	al, [esi+20] ; DPTE offset 4
    38 00005D5A 2440                <1> 	and	al, 40h ;  LBA bit (bit 6)
    39                              <1> 	;shr	al, 6
    40 00005D5C A2[6F3A0100]        <1> 	mov 	[HD_LBA_yes], al
    41 00005D61 E81C040000          <1> 	call	load_masterboot
    42 00005D66 7275                <1> 	jc	short pass_pt_this_hard_disk
    43                              <1> 
    44 00005D68 BE[2C380100]        <1> 	mov	esi, PartitionTable
    45 00005D6D 89F3                <1> 	mov	ebx, esi
    46                              <1> 	;mov	ecx, 16
    47 00005D6F B110                <1> 	mov	cl, 16
    48 00005D71 F3A5                <1> 	rep 	movsd
    49 00005D73 89DE                <1> 	mov 	esi, ebx 
    50 00005D75 C605[15FA0000]04    <1> 	mov 	byte [hdc], 4 ; 4 - partition index
    51                              <1> loc_validate_hdp_partition:
    52 00005D7C 807E0400            <1> 	cmp 	byte [esi+ptFileSystemID], 0
    53 00005D80 7641                <1> 	jna	short loc_validate_next_hdp_partition2
    54 00005D82 56                  <1> 	push	esi ; Masterboot partition table offset
    55 00005D83 52                  <1> 	push	edx ; dl = Physical drive number 
    56 00005D84 FE05[703A0100]      <1> 	inc	byte [PP_Counter]
    57 00005D8A 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 00005D8C E879010000          <1> 	call 	validate_hd_fat_partition
    63 00005D91 730A                <1> 	jnc 	short loc_set_valid_hdp_partition_entry
    64                              <1> 	;pop	edx
    65                              <1> 	;push	edx
    66 00005D93 8B1424              <1> 	mov	edx, [esp] 
    67 00005D96 E8C5020000          <1> 	call	validate_hd_fs_partition
    68 00005D9B 7224                <1> 	jc	short loc_validate_next_hdp_partition1
    69                              <1> loc_set_valid_hdp_partition_entry:
    70 00005D9D 8A0D[14F00000]      <1> 	mov 	cl, [Last_DOS_DiskNo] 
    71 00005DA3 80C141              <1> 	add 	cl, 'A'
    72                              <1> 	; ESI = Logical dos drive description table address
    73 00005DA6 880E                <1> 	mov	[esi+LD_Name], cl
    74 00005DA8 8A6602              <1> 	mov	ah, [esi+LD_PhyDrvNo]
    75 00005DAB 88E0                <1> 	mov	al, ah ; Physical drive number
    76 00005DAD 2C80                <1> 	sub	al, 80h
    77 00005DAF C0E002              <1> 	shl	al, 2
    78 00005DB2 0404                <1> 	add	al, 4 ; 0 Based
    79 00005DB4 2A05[15FA0000]      <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 00005DBA 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 00005DBD 6689467C            <1> 	mov 	[esi+LD_PartitionEntry], ax
    89                              <1> loc_validate_next_hdp_partition1:
    90 00005DC1 5A                  <1> 	pop 	edx ; dl = Physical drive number 
    91 00005DC2 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 00005DC3 FE0D[15FA0000]      <1> 	dec	byte [hdc] ; 4 - partition index
    96 00005DC9 7412                <1> 	jz	short pass_pt_this_hard_disk
    97 00005DCB 83C610              <1> 	add	esi, 16 ; 10h
    98 00005DCE EBAC                <1> 	jmp	short loc_validate_hdp_partition
    99                              <1> loc_next_hd_partition_table:
   100 00005DD0 FEC2                <1> 	inc	dl
   101 00005DD2 83C620              <1> 	add	esi, 32 ; next FDPT address
   102 00005DD5 83C740              <1> 	add	edi, 64 ; next partition table destination
   103 00005DD8 E977FFFFFF          <1>         jmp     load_next_hd_partition_table
   104                              <1> pass_pt_this_hard_disk:
   105 00005DDD 5E                  <1> 	pop	esi ; FDPT (+ DPTE) address
   106 00005DDE 5F                  <1> 	pop	edi ; Ptable_hd?
   107 00005DDF 59                  <1> 	pop	ecx
   108 00005DE0 E2EE                <1> 	loop	loc_next_hd_partition_table
   109 00005DE2 803D[703A0100]01    <1> 	cmp	byte [PP_Counter], 1
   110 00005DE9 7301                <1> 	jnb	short load_extended_dos_partitions
   111                              <1> 	; Empty partition table
   112 00005DEB C3                  <1> 	retn 
   113                              <1> load_extended_dos_partitions:
   114 00005DEC BE[6E380100]        <1> 	mov	esi, PTable_hd0
   115 00005DF1 BF[6E390100]        <1> 	mov	edi, PTable_ep0
   116 00005DF6 C605[15FA0000]80    <1> 	mov	byte [hdc], 80h
   117                              <1> next_hd_extd_partition:
   118 00005DFD 56                  <1> 	push	esi ; PTable_hd? offset
   119 00005DFE 57                  <1> 	push	edi ; PTable_ep?
   120                              <1> 	;mov	ecx, 4
   121 00005DFF B104                <1> 	mov	cl, 4
   122 00005E01 8A15[15FA0000]      <1> 	mov	dl, byte [hdc]
   123                              <1> hd_check_fs_id_05h:
   124 00005E07 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
   125 00005E0A 3C05                <1> 	cmp	al, 05h ; Is it an extended dos partition ?
   126 00005E0C 7404                <1> 	je	short loc_set_ep_start_sector
   127 00005E0E 3C0F                <1> 	cmp	al, 0Fh ; Is it an extended win4 (LBA mode) partition ?
   128 00005E10 7546                <1> 	jne	short continue_to_check_ep
   129                              <1> loc_set_ep_start_sector:
   130 00005E12 FE05[713A0100]      <1> 	inc	byte [EP_Counter]
   131 00005E18 88D4                <1> 	mov	ah, dl ; byte [hdc]
   132 00005E1A 86E0                <1> 	xchg	ah, al ; al = Drv Number, ah = Partition Identifier
   133 00005E1C 50                  <1> 	push	eax 
   134 00005E1D 30E4                <1> 	xor	ah, ah  
   135 00005E1F 2C80                <1> 	sub	al, 80h
   136 00005E21 50                  <1> 	push	eax
   137 00005E22 C0E002              <1> 	shl	al, 2 ; al = al * 4
   138 00005E25 0FB6D8              <1> 	movzx	ebx, al
   139 00005E28 81C3[723A0100]      <1> 	add	ebx, EP_StartSector
   140 00005E2E 8B4608              <1> 	mov	eax, [esi+ptStartSector]
   141                              <1>         ; EAX = Extended partition's start sector
   142 00005E31 8903                <1>         mov	[ebx], eax
   143 00005E33 58                  <1> 	pop	eax ; AL = Drv number - 80h, AH = 0 
   144 00005E34 5A                  <1> 	pop	edx ; DL = Drv number, DH = Partition ID
   145 00005E35 BB[6E360100]        <1> 	mov	ebx, MasterBootBuff
   146 00005E3A 803D[6F3A0100]01    <1> 	cmp	byte [HD_LBA_yes], 1 ; LBA ready = Yes
   147 00005E41 7240                <1> 	jb	short loc_hd_load_ep_05h
   148 00005E43 80FE05              <1> 	cmp	dh, 05h
   149 00005E46 743B                <1> 	je	short loc_hd_load_ep_05h
   150                              <1> loc_hd_load_ep_0Fh:
   151                              <1> 	; 04/01/2016
   152 00005E48 51                  <1> 	push	ecx
   153 00005E49 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 00005E4C B41B                <1> 	mov	ah, 1Bh ; LBA read
   159 00005E4E B001                <1> 	mov	al, 1 ; sector count
   160 00005E50 E8A2E3FFFF          <1> 	call	int13h
   161 00005E55 59                  <1> 	pop	ecx
   162 00005E56 733F                <1> 	jnc	short loc_hd_move_ep_table
   163                              <1> continue_to_check_ep:
   164 00005E58 83C610              <1> 	add	esi, 16
   165 00005E5B E2AA                <1> 	loop	hd_check_fs_id_05h
   166                              <1> continue_check_ep_next_disk:
   167 00005E5D 5F                  <1> 	pop	edi ; PTable_ep?
   168 00005E5E 5E                  <1> 	pop	esi ; PTable_hd?
   169 00005E5F A0[44340100]        <1> 	mov	al, [HF_NUM] ; number of hard disks
   170 00005E64 047F                <1> 	add	al, 7Fh
   171 00005E66 3805[15FA0000]      <1> 	cmp	[hdc], al
   172 00005E6C 0F8392000000        <1> 	jnb	loc_validating_hd_partitions_ok
   173 00005E72 83C640              <1> 	add	esi, 64
   174 00005E75 83C740              <1> 	add	edi, 64
   175 00005E78 FE05[15FA0000]      <1> 	inc	byte [hdc]
   176 00005E7E E97AFFFFFF          <1> 	jmp	next_hd_extd_partition
   177                              <1> loc_hd_load_ep_05h:
   178 00005E83 51                  <1> 	push	ecx 
   179 00005E84 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   180 00005E87 668B4E02            <1>         mov     cx, word [esi+ptBeginSector]
   181 00005E8B 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   182                              <1> 	;mov	ebx, MasterBootBuff
   183 00005E8F E863E3FFFF          <1> 	call	int13h
   184 00005E94 59                  <1> 	pop	ecx  
   185 00005E95 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 00005E97 8B3C24              <1> 	mov	edi, [esp]        
   190 00005E9A BE[2C380100]        <1>         mov	esi, PartitionTable ; Extended
   191 00005E9F 89F3                <1> 	mov	ebx, esi
   192                              <1> 	;mov	ecx, 16
   193 00005EA1 B110                <1> 	mov	cl, 16
   194 00005EA3 F3A5                <1>        	rep	movsd
   195 00005EA5 89DE                <1> 	mov	esi, ebx 
   196                              <1> loc_set_hde_sub_partition_count:
   197 00005EA7 C605[703A0100]04    <1> 	mov	byte [PP_Counter], 4
   198                              <1> loc_validate_hde_partition:
   199 00005EAE 807E0400            <1> 	cmp	byte [esi+ptFileSystemID], 0
   200 00005EB2 763F                <1> 	jna	short loc_validate_next_hde_partition2
   201 00005EB4 56                  <1> 	push	esi ; Extended partition table offset
   202 00005EB5 8A15[15FA0000]      <1> 	mov	dl, byte [hdc]
   203 00005EBB 0FB6C2              <1> 	movzx	eax, dl
   204 00005EBE 2C80                <1> 	sub	al, 80h
   205 00005EC0 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 00005EC3 88C1                <1> 	mov	cl, al
   211 00005EC5 80C104              <1> 	add	cl, 4
   212 00005EC8 2A0D[703A0100]      <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 00005ECE 88D5                <1>       	mov	ch, dl   
   217 00005ED0 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 00005ED3 51                  <1> 	push	ecx ; *
   222 00005ED4 BF[723A0100]        <1> 	mov	edi, EP_StartSector
   223 00005ED9 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 00005EDB E82A000000          <1> 	call	validate_hd_fat_partition
   228 00005EE0 59                  <1> 	pop	ecx ; *
   229 00005EE1 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 00005EE3 66894E7C            <1> 	mov	[esi+LD_PartitionEntry], cx 
   236                              <1> 	;
   237 00005EE7 8A0D[14F00000]      <1> 	mov	cl, [Last_DOS_DiskNo] 
   238 00005EED 80C141              <1> 	add	cl, 'A'
   239 00005EF0 880E                <1> 	mov	[esi+LD_Name], cl
   240                              <1> loc_validate_next_hde_partition1:
   241 00005EF2 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 00005EF3 FE0D[703A0100]      <1> 	dec	byte [PP_Counter]
   246 00005EF9 0F845EFFFFFF        <1> 	jz	continue_check_ep_next_disk
   247 00005EFF 83C610              <1> 	add 	esi, 16 ; 10h
   248 00005F02 EBAA                <1> 	jmp	short loc_validate_hde_partition
   249                              <1> loc_validating_hd_partitions_ok:
   250 00005F04 A0[14F00000]        <1> 	mov	al, [Last_DOS_DiskNo]
   251                              <1> loc_drv_init_retn:
   252 00005F09 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 00005F0A 8A6604              <1> 	mov 	ah, [esi+ptFileSystemID]
   275 00005F0D 80FC06              <1> 	cmp 	ah, 06h ; FAT16 CHS partition
   276                              <1> 	; 12/02/2016
   277                              <1> 	;jb	short loc_not_a_valid_fat_partition2
   278 00005F10 7305                <1>  	jnb	short vhdp_FAT16_32
   279                              <1> 	;
   280 00005F12 80FC04              <1> 	cmp	ah, 04h ; FAT16 CHS partition (< 32MB)		
   281 00005F15 7519                <1> 	jne	short loc_not_a_valid_fat_partition1
   282                              <1> vhdp_FAT16_32:
   283 00005F17 B002                <1> 	mov	al, 2
   284 00005F19 7417                <1> 	je	short loc_set_valid_hd_partition_params
   285 00005F1B 80FC0E              <1> 	cmp	ah, 0Eh ; FAT16 LBA partition
   286 00005F1E 7710                <1> 	ja	short loc_not_a_valid_fat_partition1
   287 00005F20 7410                <1> 	je	short loc_set_valid_hd_partition_params
   288                              <1> 
   289 00005F22 FEC0                <1> 	inc	al ; 3
   290 00005F24 80FC0B              <1> 	cmp	ah, 0Bh ; FAT32 CHS partition 
   291 00005F27 7409                <1> 	je	short loc_set_valid_hd_partition_params
   292 00005F29 7206                <1> 	jb	short loc_not_a_valid_fat_partition2
   293 00005F2B 80FC0C              <1> 	cmp	ah, 0Ch ; FAT32 LBA partition
   294 00005F2E 7402                <1> 	je	short loc_set_valid_hd_partition_params
   295                              <1> loc_not_a_valid_fat_partition1:
   296 00005F30 F9                  <1> 	stc
   297                              <1> loc_not_a_valid_fat_partition2:
   298 00005F31 C3                  <1> 	retn
   299                              <1> 
   300                              <1> loc_set_valid_hd_partition_params:
   301 00005F32 FE05[14F00000]      <1> 	inc 	byte [Last_DOS_DiskNo] ; > 1
   302                              <1> 	;
   303 00005F38 31DB                <1> 	xor	ebx, ebx
   304 00005F3A 8A3D[14F00000]      <1> 	mov	bh, [Last_DOS_DiskNo] ; * 256	
   305 00005F40 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   306                              <1> 	;
   307 00005F46 C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   308 00005F4A 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 00005F4D 66894303            <1> 	mov	word [ebx+LD_FATType], ax
   312                              <1> 	;
   313 00005F51 8B4E08              <1> 	mov	ecx, [esi+ptStartSector]
   314 00005F54 09FF                <1> 	or	edi, edi 
   315 00005F56 7402                <1> 	jz	short pass_hd_FAT_ep_start_sector_adding
   316                              <1> loc_add_hd_FAT_ep_start_sector:
   317 00005F58 030F                <1> 	add	ecx, [edi]
   318                              <1> pass_hd_FAT_ep_start_sector_adding:
   319 00005F5A 894B6C              <1> 	mov	[ebx+LD_StartSector], ecx
   320                              <1> loc_hd_FAT_logical_drv_init:
   321 00005F5D 89DD                <1> 	mov	ebp, ebx
   322                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   323 00005F5F A0[6F3A0100]        <1> 	mov	al, [HD_LBA_yes] ; 07/01/2016
   324 00005F64 884305              <1> 	mov	[ebx+LD_LBAYes], al
   325 00005F67 BB[823A0100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   326 00005F6C 08C0                <1> 	or	al, al
   327 00005F6E 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 00005F70 B41B                <1> 	mov	ah, 1Bh ; LBA read
   336 00005F72 B001                <1> 	mov	al, 1 ; sector count
   337 00005F74 E87EE2FFFF          <1> 	call	int13h
   338 00005F79 7313                <1> 	jnc	short loc_hd_drv_FAT_boot_validation
   339                              <1> loc_not_a_valid_fat_partition3:
   340 00005F7B C3                  <1> 	retn
   341                              <1> loc_hd_FAT_drv_init_load_bs_chs:
   342 00005F7C 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   343 00005F7F 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   344 00005F83 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   345                              <1> 	;mov	ebx, DOSBootSectorBuff
   346 00005F87 E86BE2FFFF          <1> 	call	int13h
   347 00005F8C 72ED                <1> 	jc	short loc_not_a_valid_fat_partition3
   348                              <1> loc_hd_drv_FAT_boot_validation:
   349                              <1> 	;mov	esi, DOSBootSectorBuff
   350 00005F8E 89DE                <1> 	mov	esi, ebx
   351 00005F90 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   352 00005F99 751A                <1> 	jne	short loc_not_a_valid_fat_partition4
   353 00005F9B 807E15F8            <1> 	cmp	byte [esi+BPB_Media], 0F8h
   354 00005F9F 7514                <1> 	jne	short loc_not_a_valid_fat_partition4
   355 00005FA1 66837E1600          <1> 	cmp	word [esi+BPB_FATSz16], 0
   356 00005FA6 770F                <1> 	ja	short loc_hd_FAT16_BPB
   357 00005FA8 807E4229            <1> 	cmp	byte [esi+BS_FAT32_BootSig], 29h
   358 00005FAC 7507                <1> 	jne	short loc_not_a_valid_fat_partition4
   359                              <1> loc_hd_FAT32_BPB:
   360 00005FAE B92D000000          <1> 	mov	ecx, 45
   361 00005FB3 EB0D                <1> 	jmp	short loc_hd_move_FAT_BPB
   362                              <1> 	;
   363                              <1> loc_not_a_valid_fat_partition4:
   364 00005FB5 F9                  <1> 	stc
   365 00005FB6 C3                  <1> 	retn
   366                              <1> 	;
   367                              <1> loc_hd_FAT16_BPB:
   368 00005FB7 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
   369 00005FBB 75F8                <1> 	jne	short loc_not_a_valid_fat_partition4
   370 00005FBD B920000000          <1> 	mov	ecx, 32
   371                              <1> loc_hd_move_FAT_BPB:
   372 00005FC2 89EF                <1> 	mov 	edi, ebp
   373                              <1> 	;mov	esi, ebx ; Boot sector
   374 00005FC4 57                  <1> 	push	edi
   375 00005FC5 83C706              <1> 	add	edi, LD_BPB
   376 00005FC8 F366A5              <1> 	rep	movsw 
   377 00005FCB 5E                  <1> 	pop	esi
   378 00005FCC 0FB74614            <1> 	movzx	eax, word [esi+LD_BPB+BPB_RsvdSecCnt]
   379 00005FD0 03466C              <1> 	add	eax, [esi+LD_StartSector]
   380 00005FD3 894660              <1> 	mov	[esi+LD_FATBegin], eax
   381 00005FD6 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
   382 00005FDA 7224                <1> 	jb	short loc_set_FAT16_RootDirLoc
   383                              <1> loc_set_FAT32_RootDirLoc:
   384 00005FDC 8B462A              <1> 	mov	eax, [esi+LD_BPB+BPB_FATSz32]
   385 00005FDF 0FB65E16            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_NumFATs]
   386 00005FE3 F7E3                <1> 	mul	ebx
   387 00005FE5 034660              <1> 	add	eax, [esi+LD_FATBegin]
   388                              <1> loc_set_FAT32_data_begin:
   389 00005FE8 894668              <1> 	mov	[esi+LD_DATABegin], eax
   390 00005FEB 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 00005FEE 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
   395 00005FF1 83E802              <1> 	sub	eax, 2
   396 00005FF4 7442                <1> 	jz	short short loc_set_32bit_FAT_total_sectors  
   397                              <1> 	;movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
   398 00005FF6 8A5E13              <1> 	mov	bl, byte [esi+LD_BPB+BPB_SecPerClust] 
   399 00005FF9 F7E3                <1> 	mul	ebx
   400 00005FFB 014664              <1> 	add	[esi+LD_ROOTBegin], eax
   401 00005FFE EB38                <1> 	jmp	short loc_set_32bit_FAT_total_sectors
   402                              <1> 	;
   403                              <1> loc_set_FAT16_RootDirLoc:
   404 00006000 0FB64616            <1> 	movzx	eax, byte [esi+LD_BPB+BPB_NumFATs]
   405 00006004 0FB7561C            <1> 	movzx	edx, word [esi+LD_BPB+BPB_FATSz16]
   406 00006008 F7E2                <1> 	mul	edx
   407 0000600A 034660              <1> 	add	eax, [esi+LD_FATBegin]  
   408 0000600D 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   409                              <1> loc_set_FAT16_data_begin:
   410 00006010 894668              <1> 	mov	[esi+LD_DATABegin], eax 
   411 00006013 B820000000          <1> 	mov	eax, 20h  ; Size of a directory entry
   412                              <1> 	;movzx	edx, word [esi+LD_BPB+BPB_RootEntCnt]
   413 00006018 668B5617            <1>         mov     dx, [esi+LD_BPB+BPB_RootEntCnt]
   414 0000601C F7E2                <1>         mul	edx
   415                              <1> 	;mov	ecx, 511
   416 0000601E 66B9FF01            <1> 	mov	cx, 511
   417 00006022 01C8                <1> 	add	eax, ecx
   418 00006024 41                  <1> 	inc	ecx ; 512
   419 00006025 F7F1                <1> 	div	ecx
   420 00006027 014668              <1> 	add	[esi+LD_DATABegin], eax
   421 0000602A 0FB74619            <1> 	movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
   422 0000602E 6685C0              <1> 	test	ax, ax
   423 00006031 7405                <1> 	jz	short loc_set_32bit_FAT_total_sectors
   424                              <1> loc_set_16bit_FAT_total_sectors:
   425 00006033 894670              <1> 	mov	[esi+LD_TotalSectors], eax
   426 00006036 EB06                <1> 	jmp	short loc_set_hd_FAT_cluster_count
   427                              <1> loc_set_32bit_FAT_total_sectors:
   428 00006038 8B4626              <1> 	mov	eax, [esi+LD_BPB+BPB_TotalSec32]
   429 0000603B 894670              <1> 	mov	[esi+LD_TotalSectors], eax
   430                              <1> loc_set_hd_FAT_cluster_count:
   431 0000603E 8B5668              <1> 	mov	edx, [esi+LD_DATABegin]
   432 00006041 2B566C              <1> 	sub	edx, [esi+LD_StartSector]
   433 00006044 29D0                <1> 	sub	eax, edx
   434 00006046 31D2                <1> 	xor	edx, edx ; 0
   435 00006048 0FB64E13            <1>         movzx   ecx, byte [esi+LD_BPB+BPB_SecPerClust]
   436 0000604C F7F1                <1>         div	ecx 
   437 0000604E 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 00006051 E859010000          <1> 	call	get_free_FAT_sectors
   443 00006056 7207                <1> 	jc	short loc_validate_hd_FAT_partition_retn
   444 00006058 894674              <1> 	mov	[esi+LD_FreeSectors], eax
   445 0000605B 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 0000605F 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 00006060 8A6604              <1> 	mov	ah, [esi+ptFileSystemID]
   472 00006063 80FCA1              <1> 	cmp	ah, 0A1h ; SINGLIX FS1 (trfs1) partition
   473 00006066 7549                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   474                              <1> loc_set_valid_hd_fs_partition_params:
   475 00006068 FE05[14F00000]      <1> 	inc	byte [Last_DOS_DiskNo] ; > 1
   476 0000606E 30C0                <1> 	xor	al, al ; mov al, 0
   477                              <1> 	;mov	[drv], dl
   478 00006070 29DB                <1> 	sub	ebx, ebx ; 0
   479 00006072 8A3D[14F00000]      <1> 	mov	bh, [Last_DOS_DiskNo] 
   480 00006078 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   481 0000607E C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   482 00006082 885302              <1> 	mov	[ebx+LD_PhyDrvNo], dl
   483                              <1> 	;mov	[ebx+LD_FATType], al ; 0
   484                              <1> 	;mov	[ebx+LD_FSType], ah
   485 00006085 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 00006089 89DD                <1> 	mov	ebp, ebx ; 10/01/2016
   490                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   491 0000608B A0[6F3A0100]        <1> 	mov	al, [HD_LBA_yes] ; 10/01/2016
   492 00006090 884305              <1> 	mov	[ebx+LD_LBAYes], al
   493 00006093 89DE                <1> 	mov	esi, ebx
   494 00006095 BB[823A0100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   495 0000609A 08C0                <1> 	or	al, al
   496 0000609C 7515                <1> 	jnz	short loc_hd_fs_drv_init_load_bs_lba
   497                              <1> loc_hd_fs_drv_init_load_bs_chs:
   498 0000609E 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   499 000060A1 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   500 000060A5 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   501                              <1> 	;mov	ebx, DOSBootSectorBuff
   502 000060A9 E849E1FFFF          <1> 	call	int13h
   503 000060AE 7311                <1> 	jnc	short loc_hd_drv_fs_boot_validation
   504                              <1> loc_validate_hd_fs_partition_err_retn:
   505 000060B0 C3                  <1> 	retn
   506                              <1> loc_validate_hd_fs_partition_stc_retn:
   507 000060B1 F9                  <1> 	stc
   508 000060B2 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 000060B3 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 000060B6 B41B                <1> 	mov	ah, 1Bh ; LBA read
   518 000060B8 B001                <1> 	mov	al, 1 ; sector count
   519 000060BA E838E1FFFF          <1> 	call	int13h
   520 000060BF 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 000060C1 89DE                <1> 	mov	esi, ebx ; Boot sector buffer
   524 000060C3 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   525 000060CC 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 000060CE 66817E035346        <1> 	cmp	word [esi+bs_FS_Identifier], 'SF'
   529 000060D4 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 000060D6 807E09A1            <1> 	cmp	byte [esi+bs_FS_PartitionID], 0A1h
   533 000060DA 75D5                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   534                              <1> 	;
   535 000060DC 89EF                <1> 	mov	edi, ebp ; 10/01/2016
   536                              <1> 	;
   537 000060DE 8A462D              <1> 	mov	al, byte [esi+bs_FS_LBA_Ready]
   538 000060E1 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
   539                              <1> 	;
   540                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
   541 000060E4 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
   542 000060E7 884706              <1> 	mov	byte [edi+LD_FS_MediaAttrib], al
   543                              <1> 	;
   544 000060EA 8A460A              <1> 	mov	al, [esi+bs_FS_VersionMaj]
   545 000060ED 884707              <1> 	mov	[edi+LD_FS_VersionMajor], al
   546                              <1> 	;
   547 000060F0 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
   548 000060F4 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
   549 000060F8 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
   550 000060FB 6698                <1> 	cbw
   551 000060FD 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
   552 00006101 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
   553                              <1> 	;cbw
   554 00006104 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
   555                              <1> 	;
   556 00006108 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
   557 0000610B 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
   558 0000610E 8B5618              <1> 	mov	edx, [esi+bs_FS_MATLocation]
   559 00006111 89570C              <1> 	mov	[edi+LD_FS_MATLocation], edx
   560 00006114 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
   561 00006117 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
   562 0000611A 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
   563 0000611D 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
   564 00006120 8B4710              <1> 	mov	eax, [edi+bs_FS_VolumeSize]
   565 00006123 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
   566                              <1> 	;
   567 00006126 89D0                <1> 	mov	eax, edx ; [edi+LD_FS_MATLocation]
   568 00006128 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   569 0000612B 89FE                <1> 	mov	esi, edi
   570                              <1> mread_hd_fs_MAT_sector:
   571                              <1>        ;mov	ebx, DOSBootSectorBuff
   572 0000612D B901000000          <1> 	mov	ecx, 1
   573 00006132 E842880000          <1> 	call	disk_read
   574 00006137 7248                <1> 	jc	short loc_validate_hd_fs_partition_retn
   575                              <1> 	; EDI will not be changed
   576 00006139 89DE                <1> 	mov	esi, ebx
   577                              <1> use_hdfs_mat_sector_params:
   578 0000613B 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
   579 0000613E 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
   580 00006141 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
   581 00006144 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
   582 00006147 8B4614              <1> 	mov	eax, [esi+FS_MAT_FreeSectors]
   583 0000614A 894774              <1>         mov     [edi+LD_FS_FreeSectors], eax
   584 0000614D 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
   585 00006150 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
   586 00006153 8B4708              <1> 	mov	eax, [edi+LD_FS_RootDirD]
   587 00006156 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   588 00006159 89FE                <1> 	mov	esi, edi   
   589                              <1> read_hd_fs_RDT_sector:
   590 0000615B BB[823A0100]        <1> 	mov	ebx, DOSBootSectorBuff
   591                              <1> 	;mov	ecx, 1
   592 00006160 B101                <1> 	mov	cl, 1
   593 00006162 E812880000          <1> 	call	disk_read
   594 00006167 7218                <1> 	jc	short loc_validate_hd_fs_partition_retn
   595                              <1> 	; EDI will not be changed
   596 00006169 89DE                <1> 	mov	esi, ebx
   597                              <1> use_hdfs_RDT_sector_params:
   598 0000616B 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
   599 0000616E 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
   600 00006171 57                  <1> 	push	edi
   601                              <1> 	;mov	ecx, 16
   602 00006172 B110                <1> 	mov	cl, 16
   603 00006174 83C640              <1> 	add	esi, FS_RDT_VolumeName
   604 00006177 83C72C              <1> 	add	edi, LD_FS_VolumeName
   605 0000617A F3A5                <1> 	rep	movsd ; 64 bytes
   606 0000617C 5E                  <1> 	pop	esi
   607                              <1> 		; Volume Name Reset
   608 0000617D 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 00006181 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 00006182 B40D                <1> 	mov	ah, 0Dh ; Alternate disk reset
   622 00006184 E86EE0FFFF          <1> 	call	int13h
   623 00006189 7301                <1> 	jnc	short pass_reset_error
   624                              <1> harddisk_error:
   625 0000618B C3                  <1>   	retn
   626                              <1> pass_reset_error:
   627 0000618C BB[6E360100]        <1> 	mov	ebx, MasterBootBuff
   628 00006191 66B80102            <1> 	mov	ax, 0201h
   629 00006195 66B90100            <1> 	mov	cx, 1
   630 00006199 30F6                <1> 	xor	dh, dh
   631 0000619B E857E0FFFF          <1>  	call	int13h
   632 000061A0 72E9                <1> 	jc	short harddisk_error
   633                              <1> 	;
   634 000061A2 66813D[6C380100]55- <1> 	cmp	word [MBIDCode], 0AA55h
   634 000061AA AA                  <1>
   635 000061AB 7401                <1> 	je	short load_masterboot_ok
   636 000061AD F9                  <1> 	stc
   637                              <1> load_masterboot_ok:
   638 000061AE 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 000061AF 31C0                <1> 	xor	eax, eax
   653                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Reset
   654                              <1> 	
   655 000061B1 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
   656 000061B5 7650                <1> 	jna	short loc_gfc_get_fat_free_clusters
   657                              <1> 
   658                              <1> 	; 29/02/2016
   659 000061B7 48                  <1> 	dec	eax ; 0FFFFFFFFh
   660 000061B8 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count (reset)
   661 000061BB 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster (reset)
   662 000061BE 40                  <1> 	inc	eax ; 0
   663                              <1> 	;
   664 000061BF 668B4636            <1> 	mov	ax, [esi+LD_BPB+BPB_FSInfo]
   665 000061C3 03466C              <1> 	add	eax, [esi+LD_StartSector]
   666                              <1> 
   667 000061C6 BB[823A0100]        <1> 	mov	ebx, DOSBootSectorBuff
   668 000061CB B901000000          <1> 	mov	ecx, 1
   669 000061D0 E8A4870000          <1>  	call	disk_read
   670 000061D5 7301                <1> 	jnc	short loc_gfc_check_fsinfo_signs
   671                              <1> retn_gfc_get_fsinfo_sec:
   672 000061D7 C3                  <1> 	retn
   673                              <1> 
   674                              <1> loc_gfc_check_fsinfo_signs:
   675 000061D8 BB[823A0100]        <1> 	mov 	ebx, DOSBootSectorBuff ; 13/02/2016
   676 000061DD 813B52526141        <1>         cmp     dword [ebx], 41615252h
   677 000061E3 7520                <1> 	jne	short retn_gfc_get_fsinfo_stc
   678                              <1> 	;add	ebx, 484
   679                              <1> 	;cmp	dword [ebx], 61417272h
   680 000061E5 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
   680 000061EE 61                  <1>
   681 000061EF 7514                <1> 	jne	short retn_gfc_get_fsinfo_stc
   682                              <1> 	;add	ebx, 4
   683                              <1> 	;mov	eax, [ebx]
   684 000061F1 8B83E8010000        <1> 	mov	eax, [ebx+488]
   685                              <1> 	; 29/02/2016
   686 000061F7 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
   687 000061FA 8B93EC010000        <1> 	mov	edx,  [ebx+492] 
   688 00006200 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster
   689                              <1> 	;
   690 00006203 EB12                <1> 	jmp	short retn_from_get_free_fat32_clusters
   691                              <1> 
   692                              <1> retn_gfc_get_fsinfo_stc:
   693 00006205 F9                  <1> 	stc
   694 00006206 C3                  <1> 	retn
   695                              <1> 
   696                              <1> loc_gfc_get_fat_free_clusters:
   697                              <1> 	;mov	eax, 2
   698 00006207 B002                <1> 	mov	al, 2
   699                              <1> 	;mov	[FAT_CurrentCluster], eax
   700                              <1> loc_gfc_loop_get_next_cluster:
   701 00006209 E823500000          <1> 	call	get_next_cluster
   702 0000620E 730E                <1> 	jnc	short loc_gfc_free_fat_clusters_cont
   703 00006210 21C0                <1> 	and	eax, eax
   704 00006212 7411                <1> 	jz	short loc_gfc_pass_inc_free_cluster_count
   705                              <1>  
   706                              <1> retn_from_get_free_fat_clusters:
   707 00006214 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors] ; Free clusters !
   708                              <1> retn_from_get_free_fat32_clusters:
   709 00006217 0FB65E13            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
   710 0000621B F7E3                <1>       	mul	ebx
   711                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Free sectors
   712                              <1> retn_get_free_sectors_calc:
   713 0000621D C3                  <1> 	retn
   714                              <1> 
   715                              <1> loc_gfc_free_fat_clusters_cont:
   716 0000621E 09C0                <1> 	or	eax, eax
   717 00006220 7503                <1> 	jnz	short loc_gfc_pass_inc_free_cluster_count
   718 00006222 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 00006225 89C8                <1> 	mov	eax, ecx ; [FAT_CurrentCluster]
   723 00006227 3B4678              <1> 	cmp	eax, [esi+LD_Clusters]
   724 0000622A 77E8                <1> 	ja	short retn_from_get_free_fat_clusters
   725 0000622C 40                  <1> 	inc	eax
   726                              <1> 	;mov	[FAT_CurrentCluster], eax
   727 0000622D 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 0000622F BE[16FA0000]        <1> 	mov	esi, fd0_type ; 10/01/2016
   743 00006234 BF00010900          <1> 	mov	edi, Logical_DOSDisks
   744 00006239 08D2                <1> 	or	dl, dl
   745 0000623B 7407                <1> 	jz	short loc_drv_init_fd0_fd1
   746 0000623D 81C700010000        <1> 	add	edi, 100h
   747 00006243 46                  <1> 	inc	esi ; fd1_type ; 10/01/2016
   748                              <1> loc_drv_init_fd0_fd1:
   749 00006244 C6477E00            <1> 	mov	byte [edi+LD_MediaChanged], 0
   750 00006248 803E01              <1> 	cmp	byte [esi], 1 ; type (>0 if it is existing) 
   751                              <1> 		; 4 = 1.44 MB, 80 track, 3 1/2"
   752 0000624B 7221                <1> 	jb	short read_fd_boot_sector_retn
   753 0000624D 885702              <1> 	mov	[edi+LD_PhyDrvNo], dl
   754                              <1> read_fd_boot_sector:
   755 00006250 30F6                <1> 	xor	dh, dh
   756 00006252 B904000000          <1> 	mov	ecx, 4 ; Retry Count
   757                              <1> read_fd_boot_sector_again:
   758 00006257 51                  <1> 	push 	ecx
   759                              <1> 	;mov	cx, 1
   760 00006258 B101                <1> 	mov	cl, 1
   761 0000625A 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   762 0000625E BB[823A0100]        <1> 	mov	ebx, DOSBootSectorBuff
   763 00006263 E88FDFFFFF          <1> 	call	int13h
   764 00006268 59                  <1> 	pop	ecx
   765 00006269 7304                <1> 	jnc	short use_fd_boot_sector_params
   766 0000626B E2EA                <1> 	loop	read_fd_boot_sector_again
   767                              <1> 
   768                              <1> read_fd_boot_sector_stc_retn:
   769 0000626D F9                  <1> 	stc
   770                              <1> read_fd_boot_sector_retn:
   771 0000626E C3                  <1> 	retn
   772                              <1> 
   773                              <1> use_fd_boot_sector_params:
   774                              <1> 	;mov	esi, DOSBootSectorBuff
   775 0000626F 89DE                <1> 	mov	esi, ebx
   776 00006271 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   777 0000627A 75F1                <1> 	jne	short read_fd_boot_sector_stc_retn
   778 0000627C 66817E035346        <1>         cmp     word [esi+bs_FS_Identifier], 'SF'
   779 00006282 0F85A2000000        <1>         jne     use_fd_fatfs_boot_sector_params
   780                              <1> 	;
   781 00006288 8A462D              <1> 	mov	al, [esi+bs_FS_LBA_Ready]
   782 0000628B 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
   783                              <1> 	;
   784                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
   785 0000628E 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
   786 00006291 884706              <1> 	mov	[edi+LD_FS_MediaAttrib], al
   787                              <1> 	;
   788 00006294 8A460A              <1>         mov	al, [esi+bs_FS_VersionMaj]
   789 00006297 884707              <1> 	mov	byte [edi+LD_FS_VersionMajor], al
   790 0000629A 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
   791 0000629E 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
   792 000062A2 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
   793 000062A5 6698                <1> 	cbw
   794 000062A7 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
   795 000062AB 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
   796                              <1> 	;cbw
   797 000062AE 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
   798                              <1> 	;
   799 000062B2 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
   800 000062B5 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
   801 000062B8 8B4618              <1> 	mov	eax, [esi+bs_FS_MATLocation]
   802 000062BB 89470C              <1> 	mov	[edi+LD_FS_MATLocation], eax
   803 000062BE 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
   804 000062C1 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
   805 000062C4 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
   806 000062C7 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
   807 000062CA 8B4610              <1> 	mov	eax, [esi+bs_FS_VolumeSize]
   808 000062CD 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
   809                              <1> 	;		
   810 000062D0 89FE                <1> 	mov	esi, edi
   811 000062D2 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 000062D5 B101                <1> 	mov	cl, 1
   817 000062D7 E8A3860000          <1> 	call	chs_read
   818 000062DC 89DE                <1> 	mov	esi, ebx
   819 000062DE 7301                <1> 	jnc	short use_fdfs_mat_sector_params
   820                              <1> 	;jmp	short read_fd_boot_sector_retn
   821 000062E0 C3                  <1> 	retn
   822                              <1> use_fdfs_mat_sector_params:
   823 000062E1 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
   824 000062E4 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
   825 000062E7 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
   826 000062EA 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
   827 000062ED 8B4714              <1> 	mov	eax, [edi+FS_MAT_FreeSectors]
   828 000062F0 894774              <1> 	mov	[edi+LD_FS_FreeSectors], eax
   829 000062F3 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
   830 000062F6 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
   831                              <1> 	;
   832 000062F9 89FE                <1> 	mov	esi, edi
   833 000062FB 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 000062FE B101                <1> 	mov	cl, 1
   838 00006300 E87A860000          <1> 	call	chs_read
   839 00006305 89DE                <1> 	mov	esi, ebx
   840 00006307 7220                <1> 	jc	short read_fd_RDT_sector_retn
   841                              <1> use_fdfs_RDT_sector_params:
   842 00006309 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
   843 0000630C 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
   844 0000630F 57                  <1> 	push	edi
   845                              <1> 	;mov	ecx, 16
   846 00006310 B110                <1> 	mov	cl, 16	
   847 00006312 83C640              <1> 	add	esi, FS_RDT_VolumeName
   848 00006315 83C72C              <1> 	add	edi, LD_FS_VolumeName
   849 00006318 F3A5                <1> 	rep	movsd ; 64 bytes
   850 0000631A 5E                  <1> 	pop	esi
   851 0000631B C6460300            <1> 	mov	byte [esi+LD_FATType], 0
   852 0000631F C64604A1            <1> 	mov	byte [esi+LD_FSType], 0A1h  
   853 00006323 E9A5000000          <1>         jmp     loc_cont_use_fd_boot_sector_params
   854                              <1> 
   855                              <1> read_fd_RDT_sector_stc_retn:
   856 00006328 F9                  <1> 	stc
   857                              <1> read_fd_RDT_sector_retn:
   858 00006329 C3                  <1> 	retn
   859                              <1> 
   860                              <1> use_fd_fatfs_boot_sector_params:
   861 0000632A 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
   862 0000632E 75F8                <1> 	jne	short read_fd_RDT_sector_stc_retn
   863 00006330 807E15F0            <1> 	cmp	byte [esi+BPB_Media], 0F0h
   864 00006334 72F3                <1> 	jb	short read_fd_RDT_sector_retn
   865 00006336 57                  <1> 	push	edi
   866 00006337 83C706              <1> 	add	edi, LD_BPB
   867                              <1> 	;mov	ecx, 16
   868 0000633A B110                <1> 	mov	cl, 16
   869 0000633C F3A5                <1> 	rep	movsd ; 64 bytes 
   870 0000633E 5E                  <1> 	pop	esi
   871 0000633F 31C0                <1> 	xor	eax, eax
   872 00006341 89466C              <1> 	mov	[esi+LD_StartSector], eax ; 0
   873 00006344 668B461C            <1> 	mov	ax, [esi+LD_BPB+BPB_FATSz16]
   874 00006348 8A4E16              <1> 	mov	cl, [esi+LD_BPB+BPB_NumFATs] 
   875 0000634B F7E1                <1>   	mul	ecx
   876                              <1> 	; edx = 0 !
   877 0000634D 668B5614            <1> 	mov	dx, [esi+LD_BPB+BPB_RsvdSecCnt]
   878 00006351 66895660            <1> 	mov	[esi+LD_FATBegin], dx
   879                              <1> 	;add	eax, edx
   880 00006355 6601D0              <1> 	add	ax, dx
   881 00006358 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   882 0000635B 894668              <1> 	mov	[esi+LD_DATABegin], eax 
   883 0000635E 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 00006362 6683C20F            <1> 	add	dx, 15 ; 06/07/2016 (+(512/32)-1)
   891 00006366 66C1EA04            <1> 	shr	dx, 4 ; / 16 (==16 entries per sector)
   892 0000636A 015668              <1> 	add 	[esi+LD_DATABegin], edx ; + rd sectors
   893                              <1> 	;movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
   894 0000636D 668B4619            <1> 	mov	ax, [esi+LD_BPB+BPB_TotalSec16]
   895 00006371 894670              <1> 	mov	[esi+LD_TotalSectors], eax
   896 00006374 2B4668              <1> 	sub	eax, [esi+LD_DATABegin]
   897                              <1>   	;movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust]
   898 00006377 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]  
   899 0000637A 80F901              <1> 	cmp	cl, 1
   900 0000637D 7605                <1> 	jna	short save_fd_fatfs_cluster_count
   901                              <1> 	;sub	edx, edx
   902 0000637F 6629D2              <1> 	sub	dx, dx ; 0
   903                              <1> 	;sub	dl, dl ; 06/07/2016
   904 00006382 F7F1                <1> 	div	ecx
   905                              <1> save_fd_fatfs_cluster_count:
   906 00006384 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 00006387 29C0                <1> 	sub	eax, eax ; 0  
   913 00006389 A2[863C0100]        <1> 	mov	[FAT_BuffValidData], al ; 0
   914 0000638E A2[873C0100]        <1> 	mov	[FAT_BuffDrvName], al ; 0
   915 00006393 A3[8A3C0100]        <1> 	mov	[FAT_BuffSector], eax ; 0
   916                              <1> 
   917                              <1> read_fd_FAT_sectors:
   918 00006398 BB001C0900          <1>   	mov	ebx, FAT_Buffer
   919 0000639D 668B4614            <1> 	mov	ax, [esi+LD_BPB+BPB_RsvdSecCnt]
   920                              <1> 	;mov	ecx, 3
   921 000063A1 B103                <1> 	mov	cl, 3 ; 3 sectors
   922 000063A3 E8D7850000          <1> 	call	chs_read
   923 000063A8 7240                <1> 	jc	short read_fd_FAT_sectors_retn
   924                              <1> use_fd_FAT_sectors:
   925 000063AA 8A4602              <1> 	mov	al, [esi+LD_PhyDrvNo]
   926 000063AD 0441                <1> 	add	al, 'A' 
   927 000063AF A2[873C0100]        <1> 	mov	[FAT_BuffDrvName], al 
   928 000063B4 C605[863C0100]01    <1>  	mov	byte [FAT_BuffValidData], 1
   929 000063BB E82B000000          <1> 	call	fd_init_calculate_free_clusters
   930 000063C0 7228                <1> 	jc	short read_fd_FAT_sectors_retn
   931                              <1>   
   932                              <1> loc_use_fd_boot_sector_params_FAT:
   933 000063C2 C6460301            <1> 	mov	byte [esi+LD_FATType], 1 ; FAT 12
   934 000063C6 C6460401            <1> 	mov	byte [esi+LD_FSType], 1
   935 000063CA 8B462D              <1>         mov     eax, [esi+LD_BPB+VolumeID]
   936                              <1> loc_cont_use_fd_boot_sector_params:
   937 000063CD 8A7E02              <1> 	mov	bh, [esi+LD_PhyDrvNo]
   938 000063D0 887E7D              <1> 	mov	[esi+LD_DParamEntry], bh
   939 000063D3 88FB                <1> 	mov	bl, bh
   940 000063D5 80C341              <1> 	add	bl, 'A'
   941 000063D8 881E                <1> 	mov	byte [esi+LD_Name], bl
   942 000063DA C6460101            <1> 	mov	byte [esi+LD_DiskType], 1
   943 000063DE C6460500            <1> 	mov	byte [esi+LD_LBAYes], 0
   944 000063E2 C6467C00            <1> 	mov	byte [esi+LD_PartitionEntry], 0
   945 000063E6 C6467E06            <1> 	mov	byte [esi+LD_MediaChanged], 6 ; Volume Name Reset
   946                              <1> 
   947                              <1> read_fd_FAT_sectors_retn:
   948 000063EA 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 000063EB 29C0                <1> 	sub	eax, eax
   959 000063ED 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; 0
   960 000063F0 B002                <1> 	mov	al, 2 ; eax = 2
   961                              <1> 
   962                              <1> fd_init_loop_get_next_cluster:
   963 000063F2 E830000000          <1> 	call	fd_init_get_next_cluster
   964 000063F7 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 000063F9 6621C0              <1> 	and	ax, ax
   972 000063FC 7504                <1> 	jnz	short fd_init_pass_inc_free_cluster_count
   973                              <1> 	;inc	dword [esi+LD_FreeSectors]
   974 000063FE 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 00006402 66A1[823C0100]      <1> 	mov	ax, [FAT_CurrentCluster]
   979                              <1> 	;cmp	eax, [esi+LD_Clusters]
   980 00006408 663B4678            <1> 	cmp	ax, [esi+LD_Clusters]
   981 0000640C 7704                <1> 	ja	short short retn_from_fd_init_calculate_free_clusters
   982                              <1> 	;inc	eax
   983 0000640E 6640                <1> 	inc	ax
   984 00006410 EBE0                <1> 	jmp	short fd_init_loop_get_next_cluster
   985                              <1> 
   986                              <1> retn_from_fd_init_calculate_free_clusters:
   987 00006412 8A4613              <1>   	mov	al, [esi+LD_BPB+BPB_SecPerClust]
   988 00006415 3C01                <1>   	cmp	al, 1
   989 00006417 760D                <1> 	jna	short fd_init_calculate_free_clusters_retn
   990                              <1> 	;movzx	eax, al
   991 00006419 6698                <1> 	cbw
   992                              <1> 	;mov	ecx, [esi+LD_FreeSectors]
   993 0000641B 668B4E74            <1> 	mov	cx, [esi+LD_FreeSectors] ; Count of free clusters
   994                              <1>   	;mul	ecx
   995 0000641F 66F7E1              <1> 	mul	cx
   996                              <1> 	;mov	[esi+LD_FreeSectors], eax
   997 00006422 66894674            <1> 	mov	[esi+LD_FreeSectors], ax
   998                              <1> fd_init_calculate_free_clusters_retn:
   999 00006426 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 00006427 A3[823C0100]        <1> 	mov	[FAT_CurrentCluster], eax
  1014                              <1> fd_init_get_next_cluster_readnext:
  1015 0000642C 29D2                <1> 	sub	edx, edx ; 0
  1016 0000642E BB00040000          <1>   	mov	ebx, 1024 ; 400h
  1017 00006433 F7F3                <1>   	div	ebx
  1018                              <1>   	; EAX = Count of 3 FAT sectors
  1019                              <1>   	; EDX = Buffer entry index
  1020 00006435 89C1                <1> 	mov	ecx, eax
  1021                              <1> 	;mov	eax, 3
  1022 00006437 B003                <1> 	mov	al, 3
  1023 00006439 F7E2                <1> 	mul	edx ; Multiply by 3
  1024 0000643B 66D1E8              <1> 	shr	ax, 1 ; Divide by 2
  1025 0000643E 89C3                <1> 	mov	ebx, eax ; Buffer byte offset
  1026 00006440 81C3001C0900        <1> 	add	ebx, FAT_Buffer
  1027 00006446 89C8                <1> 	mov	eax, ecx
  1028                              <1> 	;mov	edx, 3
  1029 00006448 66BA0300            <1> 	mov	dx, 3
  1030 0000644C F7E2                <1> 	mul	edx 
  1031                              <1>   	; EAX = FAT Beginning Sector
  1032                              <1> 	; EDX = 0
  1033 0000644E 8A0E                <1> 	mov	cl, [esi+LD_Name]
  1034                              <1> 	;cmp	byte [FAT_BuffValidData], 0
  1035                              <1> 	;jna	short fd_init_load_FAT_sectors0
  1036 00006450 3A0D[873C0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
  1037 00006456 751E                <1> 	jne	short fd_init_load_FAT_sectors0
  1038 00006458 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
  1039 0000645E 751C                <1> 	jne	short fd_init_load_FAT_sectors1
  1040                              <1> 	;mov	eax, [FAT_CurrentCluster]
  1041 00006460 A0[823C0100]        <1> 	mov	al, [FAT_CurrentCluster]
  1042                              <1> 	;shr	eax, 1
  1043 00006465 D0E8                <1> 	shr	al, 1
  1044 00006467 668B03              <1> 	mov	ax, [ebx]
  1045 0000646A 7306                <1>   	jnc	short fd_init_gnc_even
  1046 0000646C 66C1E804            <1> 	shr	ax, 4
  1047                              <1> fd_init_gnc_clc_retn:
  1048 00006470 F8                  <1> 	clc
  1049 00006471 C3                  <1> 	retn
  1050                              <1> 
  1051                              <1> fd_init_gnc_even:
  1052 00006472 80E40F              <1> 	and	ah, 0Fh
  1053 00006475 C3                  <1> 	retn
  1054                              <1> 
  1055                              <1> fd_init_load_FAT_sectors0:
  1056 00006476 880D[873C0100]      <1> 	mov 	[FAT_BuffDrvName], cl
  1057                              <1> fd_init_load_FAT_sectors1:
  1058 0000647C C605[863C0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1059 00006483 A3[8A3C0100]        <1> 	mov	[FAT_BuffSector], eax
  1060 00006488 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1061 0000648B BB001C0900          <1>  	mov	ebx, FAT_Buffer
  1062                              <1> 	;movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
  1063 00006490 668B4E1C            <1> 	mov	cx, [esi+LD_BPB+BPB_FATSz16]
  1064 00006494 662B0D[8A3C0100]    <1> 	sub	cx, [FAT_BuffSector]
  1065                              <1>         ;cmp	ecx, 3
  1066 0000649B 6683F903            <1> 	cmp	cx, 3
  1067 0000649F 7605                <1> 	jna	short fdinit_pass_fix_sector_count_3
  1068                              <1> 	;mov	ecx, 3
  1069 000064A1 B903000000          <1> 	mov	ecx, 3
  1070                              <1> fdinit_pass_fix_sector_count_3:  
  1071 000064A6 E8D4840000          <1> 	call	chs_read
  1072 000064AB 730D                <1> 	jnc	short fd_init_FAT_sectors_no_load_error
  1073 000064AD C605[863C0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1074                              <1> 		; Drv not ready or read Error !
  1075 000064B4 B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; 15
  1076                              <1> 	;xor	edx, edx
  1077 000064B9 C3                  <1> 	retn
  1078                              <1> 
  1079                              <1> fd_init_FAT_sectors_no_load_error:
  1080 000064BA C605[863C0100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1081 000064C1 A1[823C0100]        <1> 	mov	eax, [FAT_CurrentCluster]
  1082 000064C6 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 000064CB 89DE                <1> 	mov	esi, ebx
  1100 000064CD 81E600FF0000        <1> 	and	esi, 0FF00h ; esi = bh
  1101 000064D3 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1102 000064D9 8A06                <1> 	mov     al, [esi+LD_Name]
  1103 000064DB 8A6603              <1> 	mov     ah, [esi+LD_FATType]
  1104 000064DE 80FC01              <1> 	cmp     ah, 1
  1105 000064E1 7210                <1> 	jb    	short loc_gfvn_dir_load_err
  1106 000064E3 3C41                <1> 	cmp 	al, 'A'
  1107 000064E5 720C                <1> 	jb      short loc_gfvn_dir_load_err
  1108 000064E7 80FC02              <1> 	cmp 	ah, 2 
  1109 000064EA 7708                <1> 	ja      short get_FAT32_root_cluster
  1110                              <1> 	
  1111 000064EC E89B4E0000          <1> 	call    load_FAT_root_directory
  1112 000064F1 730B                <1> 	jnc     short loc_get_volume_name
  1113                              <1> 
  1114                              <1> loc_gfvn_dir_load_err:
  1115 000064F3 C3                  <1> 	retn
  1116                              <1> 
  1117                              <1> get_FAT32_root_cluster:
  1118 000064F4 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
  1119 000064F7 E81B4F0000          <1> 	call    load_FAT_sub_directory
  1120 000064FC 7224                <1> 	jc	short loc_get_volume_name_retn
  1121                              <1> 
  1122                              <1> loc_get_volume_name:
  1123 000064FE BE00000800          <1>         mov     esi, Directory_Buffer
  1124 00006503 6631C9              <1> 	xor	cx, cx ; 0
  1125                              <1> check_root_volume_name:
  1126 00006506 8A06                <1> 	mov	al, [esi]
  1127 00006508 08C0                <1> 	or      al, al
  1128 0000650A 7416                <1> 	jz      short loc_get_volume_name_retn
  1129 0000650C 807E0B08            <1> 	cmp     byte [esi+0Bh], 08h
  1130 00006510 7410                <1> 	je      short loc_get_volume_name_retn
  1131 00006512 663B0D[9B3C0100]    <1> 	cmp     cx, [DirBuff_LastEntry]
  1132 00006519 7308                <1> 	jnb     short pass_check_root_volume_name
  1133 0000651B 6641                <1> 	inc     cx
  1134 0000651D 83C620              <1> 	add     esi, 32
  1135 00006520 EBE4                <1> 	jmp     short check_root_volume_name
  1136                              <1> 
  1137                              <1> loc_get_volume_name_retn:
  1138 00006522 C3                  <1> 	retn
  1139                              <1>     
  1140                              <1> pass_check_root_volume_name:
  1141 00006523 803D[973C0100]03    <1> 	cmp	byte [DirBuff_FATType], 3
  1142 0000652A 7230                <1> 	jb	short loc_get_volume_name_retn_xor
  1143                              <1> 
  1144 0000652C BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1145 00006531 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1146 00006536 31C0                <1> 	xor	eax, eax
  1147 00006538 8A25[963C0100]      <1> 	mov	ah, [DirBuff_DRV]
  1148 0000653E 80EC41              <1> 	sub	ah, 'A' 
  1149 00006541 01C6                <1> 	add	esi, eax
  1150 00006543 A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
  1151 00006548 E8E44C0000          <1> 	call	get_next_cluster
  1152 0000654D 7305                <1> 	jnc 	short loc_gfvn_load_FAT32_dir_cluster
  1153                              <1>   	
  1154 0000654F 83F801              <1> 	cmp     eax, 1
  1155 00006552 F5                  <1> 	cmc
  1156 00006553 C3                  <1> 	retn
  1157                              <1>   
  1158                              <1> loc_gfvn_load_FAT32_dir_cluster:
  1159 00006554 E8BE4E0000          <1> 	call	load_FAT_sub_directory
  1160 00006559 73A3                <1> 	jnc	short loc_get_volume_name
  1161 0000655B C3                  <1> 	retn
  1162                              <1> 
  1163                              <1> loc_get_volume_name_retn_xor:
  1164 0000655C 31C0                <1> 	xor 	eax, eax
  1165 0000655E 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 0000655F B416                <1> 	mov	ah, 16h
  1177 00006561 E891DCFFFF          <1>   	call	int13h
  1178 00006566 80FC06              <1> 	cmp	ah, 06h
  1179 00006569 7405                <1> 	je	short loc_gmc_status_retn
  1180 0000656B 08E4                <1> 	or	ah, ah
  1181 0000656D 7401                <1> 	jz	short loc_gmc_status_retn
  1182                              <1> loc_gmc_status_stc_retn:    
  1183 0000656F F9                  <1> 	stc
  1184                              <1> loc_gmc_status_retn:
  1185 00006570 C3                  <1> 	retn
  2156                                  %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 00006571 31DB                <1> 	xor	ebx, ebx
    34 00006573 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 00006575 BE00010900          <1> 	mov	esi, Logical_DOSDisks
    43 0000657A 01DE                <1> 	add	esi, ebx
    44                              <1> loc_ccdrv_dos_drive_name_check:
    45 0000657C 80FA02              <1> 	cmp	dl, 2
    46 0000657F 720F                <1> 	jb	short loc_ccdrv_dos_drive_name_check_ok
    47                              <1> 
    48 00006581 8A06                <1> 	mov	al, [esi+LD_Name]
    49 00006583 2C41                <1> 	sub	al, 'A'
    50 00006585 38D0                <1> 	cmp	al, dl
    51 00006587 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 00006589 B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    56                              <1> loc_change_current_drive_stc_retn:
    57 0000658E F9                  <1> 	stc
    58 0000658F C3                  <1> 	retn  
    59                              <1> 
    60                              <1> loc_ccdrv_dos_drive_name_check_ok:
    61 00006590 8A667E              <1> 	mov	ah, [esi+LD_MediaChanged]
    62 00006593 80FC06              <1> 	cmp	ah, 6  ; VOLUME NAME CHECK/MOVE SIGN
    63 00006596 7455                <1> 	je	short loc_ccdrv_get_FAT_volume_name_0
    64                              <1> 
    65 00006598 80FA01              <1> 	cmp	dl, 1
    66 0000659B 777D                <1> 	ja	short loc_gmcs_init_drv_hd
    67                              <1> 
    68                              <1> loc_gmcs_init_drv_fd:
    69 0000659D 08E4                <1> 	or	ah, ah 
    70                              <1> 	; AH = 1 is initialization sign (invalid_fd_parameter)
    71 0000659F 7517                <1> 	jnz	short loc_ccdrv_call_fd_init
    72                              <1> 
    73 000065A1 E8B9FFFFFF          <1> 	call	get_media_change_status
    74 000065A6 72E1                <1> 	jc	short loc_ccdrv_drive_not_ready_err
    75                              <1> 
    76 000065A8 20E4                <1> 	and	ah, ah
    77 000065AA 7476                <1> 	jz	short loc_change_current_drv3
    78                              <1> 
    79 000065AC 80F406              <1> 	xor	ah, 6
    80 000065AF 75D8                <1> 	jnz	short loc_ccdrv_drive_not_ready_err
    81                              <1> 
    82                              <1> loc_ccdrv_call_fd_init_check_vol_id:
    83 000065B1 E8490A0000          <1> 	call	get_volume_serial_number
    84 000065B6 730D                <1> 	jnc	short loc_ccdrv_check_vol_serial
    85                              <1> 
    86                              <1> loc_ccdrv_call_fd_init:
    87 000065B8 E872FCFFFF          <1> 	call	floppy_drv_init
    88 000065BD 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 000065BF B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    93 000065C4 C3                  <1> 	retn
    94                              <1> 
    95                              <1> loc_ccdrv_check_vol_serial:
    96 000065C5 A3[64340100]        <1> 	mov	[Current_VolSerial], eax
    97                              <1> 	;mov	dl, bh
    98 000065CA E860FCFFFF          <1> 	call	floppy_drv_init
    99 000065CF 72EE                <1> 	jc	short loc_ccdrv_fdinit_fail_retn
   100                              <1> 
   101 000065D1 3B05[64340100]      <1> 	cmp	eax, [Current_VolSerial]
   102 000065D7 7445                <1> 	je	short loc_change_current_drv2
   103                              <1> 
   104                              <1> loc_reset_drv_fd_current_dir:
   105 000065D9 31C0                <1> 	xor	eax, eax              
   106 000065DB 88467F              <1>         mov	[esi+LD_CDirLevel], al
   107 000065DE 89F7                <1> 	mov	edi, esi
   108 000065E0 81C780000000        <1> 	add	edi, LD_CurrentDirectory
   109 000065E6 B920000000          <1> 	mov	ecx, 32
   110 000065EB F3AB                <1> 	rep	stosd   
   111                              <1>  
   112                              <1> loc_ccdrv_get_FAT_volume_name_0:
   113 000065ED 8A4603              <1> 	mov	al, [esi+LD_FATType]
   114 000065F0 08C0                <1> 	or	al, al
   115 000065F2 742A                <1> 	jz	short loc_change_current_drv2
   116                              <1> 
   117 000065F4 56                  <1> 	push	esi 
   118 000065F5 3C02                <1> 	cmp	al, 2
   119 000065F7 7705                <1> 	ja	short loc_ccdrv_get_FAT32_vol_name
   120                              <1>              
   121                              <1> loc_ccdrv_get_FAT2_16_vol_name:
   122 000065F9 83C631              <1> 	add	esi, LD_BPB + VolumeLabel
   123 000065FC EB03                <1> 	jmp	short loc_ccdrv_get_FAT_volume_name_1
   124                              <1> 
   125                              <1> loc_ccdrv_get_FAT32_vol_name:
   126 000065FE 83C64D              <1> 	add	esi, LD_BPB + FAT32_VolLab
   127                              <1> loc_ccdrv_get_FAT_volume_name_1:
   128 00006601 53                  <1> 	push	ebx
   129 00006602 56                  <1> 	push	esi
   130 00006603 E8C3FEFFFF          <1> 	call	get_FAT_volume_name
   131 00006608 5F                  <1> 	pop	edi
   132 00006609 5B                  <1> 	pop	ebx
   133                              <1> 	; BL = 0
   134 0000660A 720B                <1> 	jc	short loc_change_current_drv1
   135 0000660C 20C0                <1> 	and	al, al
   136 0000660E 7407                <1> 	jz	short loc_change_current_drv1
   137                              <1> 
   138                              <1> loc_ccdrv_move_FAT_volume_name:
   139 00006610 B90B000000          <1> 	mov	ecx, 11
   140 00006615 F3A4                <1> 	rep	movsb
   141                              <1> 
   142                              <1> loc_change_current_drv1:
   143 00006617 5E                  <1> 	pop	esi
   144 00006618 EB04                <1> 	jmp	short loc_change_current_drv2
   145                              <1> 
   146                              <1> loc_gmcs_init_drv_hd:
   147 0000661A 08E4                <1> 	or	ah, ah
   148 0000661C 7404                <1> 	jz	short loc_change_current_drv3
   149                              <1> 	; BL = 0, BH = Logical DOS drive number
   150                              <1> loc_change_current_drv2:
   151 0000661E C6467E00            <1> 	mov	byte [esi+LD_MediaChanged], 0
   152                              <1> loc_change_current_drv3:
   153 00006622 883D[6E340100]      <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 00006628 8A4603              <1> 	mov	al, [esi+LD_FATType]
   172 0000662B A2[6D340100]        <1> 	mov	[Current_FATType], al
   173                              <1> 
   174 00006630 8A26                <1> 	mov	ah, [esi+LD_Name] 
   175 00006632 8825[6F340100]      <1> 	mov	[Current_Dir_Drv], ah
   176                              <1> 
   177 00006638 20C0                <1> 	and	al, al
   178 0000663A 741D                <1> 	jz	short loc_restore_FS_current_directory
   179                              <1> 
   180                              <1> loc_restore_FAT_current_directory:
   181 0000663C 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   182 0000663F 8825[6C340100]      <1> 	mov	[Current_Dir_Level], ah
   183 00006645 08E4                <1> 	or	ah, ah
   184 00006647 7416                <1>         jz	short loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster
   185                              <1> 
   186 00006649 0FB6D4              <1> 	movzx	edx, ah
   187 0000664C C0E204              <1> 	shl	dl, 4 ; * 16
   188 0000664F 01F2                <1>         add	edx, esi
   189 00006651 8B828C000000        <1> 	mov	eax, [edx+LD_CurrentDirectory+12]
   190 00006657 EB2C                <1> 	jmp	short loc_ccdrv_reset_cdir_FAT_fcluster
   191                              <1> 
   192                              <1> loc_restore_FS_current_directory:
   193 00006659 E8F44D0000          <1> 	call	load_current_FS_directory 
   194 0000665E C3                  <1> 	retn 
   195                              <1> 
   196                              <1> loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster:
   197 0000665F 3C03                <1> 	cmp	al, 3
   198 00006661 7205                <1> 	jb	short loc_ccdrv_reset_cdir_FAT_12_16_fcluster
   199                              <1> loc_ccdrv_reset_cdir_FAT32_fcluster:
   200 00006663 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   201 00006666 EB04                <1> 	jmp	short loc_ccdrv_check_rootdir_sign
   202                              <1> loc_ccdrv_reset_cdir_FAT_12_16_fcluster:   
   203 00006668 30C0                <1> 	xor	al, al  ; xor eax, eax
   204 0000666A 31D2                <1> 	xor	edx, edx
   205                              <1> loc_ccdrv_check_rootdir_sign:
   206 0000666C 80BE8000000000      <1> 	cmp	byte [esi+LD_CurrentDirectory], 0
   207 00006673 7510                <1> 	jne	short loc_ccdrv_reset_cdir_FAT_fcluster
   208                              <1> loc_ccdrv_set_rootdir_FAT_fcluster:
   209 00006675 89868C000000        <1>         mov     [esi+LD_CurrentDirectory+12], eax
   210 0000667B C78680000000524F4F- <1> 	mov	dword [esi+LD_CurrentDirectory], 'ROOT'
   210 00006684 54                  <1>
   211                              <1> 
   212                              <1> loc_ccdrv_reset_cdir_FAT_fcluster:
   213 00006685 A3[68340100]        <1> 	mov	[Current_Dir_FCluster], eax
   214                              <1> 
   215 0000668A BF[CF3C0100]        <1> 	mov	edi, PATH_Array
   216 0000668F 89F2                <1> 	mov	edx, esi
   217 00006691 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   218 00006697 B920000000          <1> 	mov	ecx, 32
   219 0000669C F3A5                <1> 	rep	movsd
   220                              <1> 
   221 0000669E E8832D0000          <1> 	call	change_prompt_dir_string
   222                              <1> 	
   223 000066A3 89D6                <1> 	mov	esi, edx
   224                              <1> 	
   225 000066A5 29C0                <1>         sub	eax, eax
   226                              <1>        ;sub	edx, edx
   227 000066A7 BF[6F340100]        <1> 	mov	edi, Current_Dir_Drv
   228                              <1> 
   229 000066AC A2[15F00000]        <1> 	mov	[Restore_CDIR], al ; 0
   230 000066B1 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 000066B2 C705[2C410100]-     <1> 	mov	dword [mainprog_return_addr], return_from_cmd_interpreter
   242 000066B8 [66670000]          <1>
   243                              <1> 
   244                              <1> loc_TRDOS_prompt:
   245 000066BC BF[6E350100]        <1> 	mov	edi, TextBuffer
   246 000066C1 C6075B              <1> 	mov	byte [edi], "["
   247 000066C4 47                  <1> 	inc	edi
   248 000066C5 BE[68F00000]        <1> 	mov	esi, TRDOSPromptLabel
   249                              <1> get_next_prompt_label_char:
   250 000066CA 803E20              <1> 	cmp	byte [esi], 20h
   251 000066CD 7203                <1> 	jb	short pass_prompt_label
   252 000066CF A4                  <1> 	movsb
   253 000066D0 EBF8                <1> 	jmp	short get_next_prompt_label_char
   254                              <1> pass_prompt_label:
   255 000066D2 C6075D              <1> 	mov	byte [edi], "]"
   256 000066D5 47                  <1> 	inc	edi
   257 000066D6 C60720              <1> 	mov	byte [edi], 20h
   258 000066D9 47                  <1> 	inc	edi
   259 000066DA BE[6F340100]        <1> 	mov	esi, Current_Dir_Drv
   260 000066DF 66A5                <1> 	movsw
   261 000066E1 A4                  <1> 	movsb 
   262                              <1> loc_prompt_current_directory:
   263 000066E2 803E20              <1> 	cmp	byte [esi], 20h
   264 000066E5 7203                <1> 	jb	short pass_prompt_current_directory
   265 000066E7 A4                  <1> 	movsb
   266 000066E8 EBF8                <1> 	jmp	short loc_prompt_current_directory  
   267                              <1> pass_prompt_current_directory:
   268 000066EA C6073E              <1> 	mov	byte [edi], '>'
   269 000066ED 47                  <1> 	inc	edi
   270 000066EE C60700              <1> 	mov	byte [edi], 0  
   271 000066F1 BE[6E350100]        <1> 	mov	esi, TextBuffer
   272 000066F6 E876F5FFFF          <1> 	call	print_msg
   273                              <1>         
   274                              <1> 	;sub	bh, bh ; video page = 0
   275                              <1> 	;call	get_cpos ; get cursor position
   276 000066FB 668B15[C6330100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   277 00006702 8815[CE340100]      <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 00006708 E899000000          <1> 	call	rw_char
   297                              <1> loc_move_command:
   298 0000670D BE[1E350100]        <1> 	mov	esi, CommandBuffer
   299 00006712 89F7                <1> 	mov	edi, esi
   300 00006714 31C9                <1> 	xor	ecx, ecx
   301                              <1> first_command_char:
   302 00006716 AC                  <1> 	lodsb
   303 00006717 3C20                <1> 	cmp	al, 20h
   304 00006719 772E                <1> 	ja	short pass_space_control
   305 0000671B 7241                <1> 	jb	short loc_move_cmd_arguments_ok
   306 0000671D 81FE[6D350100]      <1> 	cmp	esi, CommandBuffer + 79
   307 00006723 72F1                <1> 	jb	short first_command_char
   308 00006725 EB37                <1> 	jmp	short loc_move_cmd_arguments_ok
   309                              <1> 
   310                              <1> next_command_char:
   311 00006727 AC                  <1> 	lodsb
   312 00006728 3C20                <1> 	cmp	al, 20h
   313 0000672A 771D                <1> 	ja	short pass_space_control
   314 0000672C 7230                <1> 	jb	short loc_move_cmd_arguments_ok
   315                              <1> 
   316                              <1> loc_1st_cmd_arg: ; 30/01/2016
   317 0000672E AC                  <1> 	lodsb
   318 0000672F 3C20                <1> 	cmp	al, 20h
   319 00006731 74FB                <1> 	je	short loc_1st_cmd_arg
   320 00006733 7229                <1> 	jb	short loc_move_cmd_arguments_ok
   321                              <1> 	
   322 00006735 C60700              <1>         mov     byte [edi], 0
   323 00006738 47                  <1> 	inc	edi
   324                              <1> 
   325                              <1> loc_move_cmd_arguments:
   326 00006739 AA                  <1> 	stosb
   327 0000673A 81FE[6D350100]      <1> 	cmp	esi, CommandBuffer + 79
   328 00006740 731C                <1> 	jnb	short loc_move_cmd_arguments_ok
   329 00006742 AC                  <1>         lodsb
   330 00006743 3C20                <1> 	cmp	al, 20h
   331 00006745 73F2                <1> 	jnb	short loc_move_cmd_arguments
   332 00006747 EB15                <1> 	jmp	short loc_move_cmd_arguments_ok
   333                              <1> 
   334                              <1> pass_space_control:
   335 00006749 3C61                <1> 	cmp	al, 61h
   336 0000674B 7206                <1> 	jb	short pass_capitalize
   337 0000674D 3C7A                <1> 	cmp	al, 7Ah
   338 0000674F 7702                <1> 	ja	short pass_capitalize
   339 00006751 24DF                <1> 	and	al, 0DFh
   340                              <1> pass_capitalize:
   341 00006753 AA                  <1> 	stosb   
   342 00006754 FEC1                <1> 	inc     cl
   343 00006756 81FE[6D350100]      <1>         cmp     esi, CommandBuffer + 79
   344 0000675C 72C9                <1> 	jb      short next_command_char 
   345                              <1> 
   346                              <1> loc_move_cmd_arguments_ok:
   347 0000675E C60700              <1>         mov     byte [edi], 0
   348                              <1> 
   349                              <1> call_command_interpreter:
   350 00006761 E8D4080000          <1> 	call    command_interpreter
   351                              <1> 
   352                              <1> return_from_cmd_interpreter:
   353 00006766 B950000000          <1>         mov	ecx, 80
   354                              <1> 	;mov	cx, 80
   355 0000676B BF[1E350100]        <1> 	mov	edi, CommandBuffer
   356 00006770 30C0                <1> 	xor	al, al
   357 00006772 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 00006774 803D[E2FB0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80*25 color
   363 0000677B 741D                <1> 	je	short pass_set_txt_mode
   364                              <1> 
   365 0000677D E8D2ADFFFF          <1> 	call	set_txt_mode ; set vide mode to 03h
   366                              <1> 	; 07/01/2017
   367 00006782 30C0                <1> 	xor	al, al
   368                              <1> 
   369                              <1> loc_check_active_page:
   370                              <1> 	;xor	al, al
   371 00006784 3805[D6330100]      <1> 	cmp	[ACTIVE_PAGE], al ; 0
   372 0000678A 0F842CFFFFFF        <1>         je      loc_TRDOS_prompt 
   373                              <1> 	; AL = 0 = video page 0
   374 00006790 E8D8B1FFFF          <1> 	call	set_active_page
   375 00006795 E922FFFFFF          <1>         jmp     loc_TRDOS_prompt ; infinitive loop
   376                              <1> 
   377                              <1> pass_set_txt_mode: 
   378 0000679A BE[97020100]        <1> 	mov	esi, nextline
   379 0000679F E8CDF4FFFF          <1> 	call	print_msg
   380 000067A4 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 000067A6 30E4                <1> 	xor     ah, ah
   396 000067A8 E85AA4FFFF          <1> 	call	int16h
   397 000067AD 20C0                <1> 	and	al, al
   398 000067AF 7434                <1> 	jz	short loc_arrow    
   399 000067B1 3CE0                <1> 	cmp	al, 0E0h          
   400 000067B3 7430                <1> 	je	short loc_arrow
   401 000067B5 3C08                <1> 	cmp	al, 08h             
   402 000067B7 7544                <1> 	jne	short char_return
   403                              <1> loc_back:
   404 000067B9 3A15[CE340100]      <1> 	cmp	dl, [CursorColumn]
   405 000067BF 76E5                <1> 	jna     short readnextchar
   406                              <1> prev_column:
   407 000067C1 FECA                <1> 	dec	dl
   408                              <1> set_cursor_pos:
   409 000067C3 6652                <1> 	push	dx
   410                              <1> 	;xor	bh, bh ; 0 = video page 0
   411                              <1> 	; DH = Row, DL = Column
   412 000067C5 E86FB5FFFF          <1> 	call	_set_cpos ; 17/01/2016
   413 000067CA 665A                <1>         pop	dx
   414                              <1> 	;movzx	ebx, dl
   415 000067CC 88D3                <1> 	mov	bl, dl
   416 000067CE 2A1D[CE340100]      <1> 	sub	bl, [CursorColumn] 
   417 000067D4 B020                <1> 	mov	al, 20h
   418 000067D6 8883[1E350100]      <1> 	mov	[CommandBuffer+ebx], al
   419                              <1> 	;sub	bh, bh ; video page 0
   420                              <1> 	;mov	cx, 1
   421 000067DC B307                <1> 	mov	bl, 7 ; color attribute
   422 000067DE E847B4FFFF          <1> 	call	_write_c_current ; 17/01/2016
   423                              <1> 	;mov	dx, [CURSOR_POSN]
   424 000067E3 EBC1                <1> 	jmp	short readnextchar
   425                              <1> loc_arrow:    
   426 000067E5 80FC4B              <1> 	cmp	ah, 4Bh
   427 000067E8 74CF                <1> 	je	short loc_back
   428 000067EA 80FC53              <1> 	cmp	ah, 53h
   429 000067ED 74CA                <1> 	je      short loc_back
   430 000067EF 80FC4D              <1> 	cmp	ah, 4Dh
   431 000067F2 75B2                <1> 	jne	short readnextchar
   432 000067F4 80FA4F              <1> 	cmp	dl, 79
   433 000067F7 73AD                <1> 	jnb	short readnextchar
   434 000067F9 FEC2                <1> 	inc	dl
   435 000067FB EBC6                <1> 	jmp	short set_cursor_pos
   436                              <1> char_return:
   437 000067FD 0FB6DA              <1> 	movzx	ebx, dl
   438 00006800 2A1D[CE340100]      <1> 	sub	bl, [CursorColumn] 
   439 00006806 3C20                <1> 	cmp	al, 20h
   440 00006808 7220                <1> 	jb	short loc_escape
   441 0000680A 8883[1E350100]      <1> 	mov	[CommandBuffer+ebx], al
   442 00006810 80FA4F              <1> 	cmp	dl, 79
   443 00006813 7391                <1> 	jnb	short readnextchar
   444 00006815 66BB0700            <1> 	mov	bx, 7 ; color attribute
   445 00006819 E885B4FFFF          <1> 	call	_write_tty
   446 0000681E 668B15[C6330100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   447 00006825 E97CFFFFFF          <1>         jmp     readnextchar
   448                              <1> loc_escape:
   449 0000682A 3C1B                <1> 	cmp	al, 1Bh
   450 0000682C 7418                <1> 	je	short rw_char_retn
   451                              <1> 	;
   452 0000682E 3C0D                <1> 	cmp	al, 0Dh ; CR
   453 00006830 0F8570FFFFFF        <1>         jne     readnextchar
   454                              <1> 	; 13/05/2016
   455 00006836 66BB0700            <1> 	mov	bx, 7 ; attribute/color (bl)
   456                              <1> 		      ; video page 0 (bh=0)	
   457 0000683A E864B4FFFF          <1> 	call	_write_tty
   458                              <1> 	;mov	bx, 7  ; attribute/color
   459                              <1> 		      ; video page 0 (bh=0)
   460 0000683F B00A                <1> 	mov	al, 0Ah ; LF
   461 00006841 E85DB4FFFF          <1> 	call	_write_tty
   462                              <1> rw_char_retn:
   463 00006846 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 00006847 E847F1FFFF          <1> 	call	RTC_40	; GET RTC DATE
   472                              <1> 
   473 0000684C 88D0                <1> 	mov	al, dl
   474 0000684E E8ABA3FFFF          <1>   	call	bcd_to_ascii
   475 00006853 66A3[54F10000]      <1> 	mov	[Day], ax
   476                              <1> 
   477 00006859 88F0                <1> 	mov	al, dh
   478 0000685B E89EA3FFFF          <1>   	call	bcd_to_ascii
   479 00006860 66A3[57F10000]      <1> 	mov	[Month], ax
   480                              <1> 
   481 00006866 88E8                <1> 	mov	al, ch
   482 00006868 E891A3FFFF          <1>   	call	bcd_to_ascii
   483 0000686D 66A3[5AF10000]      <1> 	mov	[Century], ax
   484                              <1> 
   485 00006873 88C8                <1> 	mov	al, cl
   486 00006875 E884A3FFFF          <1>   	call	bcd_to_ascii
   487 0000687A 66A3[5CF10000]      <1> 	mov	word [Year], ax
   488                              <1> 
   489 00006880 BE[44F10000]        <1> 	mov	esi, Msg_Show_Date
   490 00006885 E8E7F3FFFF          <1> 	call	print_msg
   491                              <1> 
   492 0000688A 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 0000688B BE[28F10000]        <1> 	mov	esi, Msg_Enter_Date
   500 00006890 E8DCF3FFFF          <1> 	call	print_msg
   501                              <1> 
   502                              <1> loc_enter_day_1:
   503 00006895 30E4                <1> 	xor     ah, ah
   504 00006897 E86BA3FFFF          <1> 	call	int16h
   505                              <1> 	; AL = ASCII Code of the Character
   506 0000689C 3C0D                <1> 	cmp	al, 13
   507 0000689E 0F84B7010000        <1> 	je	loc_set_date_retn
   508 000068A4 3C1B                <1> 	cmp	al, 27
   509 000068A6 0F84AF010000        <1> 	je	loc_set_date_retn
   510 000068AC A2[54F10000]        <1> 	mov	[Day], al
   511 000068B1 3C30                <1> 	cmp	al, '0'
   512 000068B3 0F82AD010000        <1> 	jb	loc_set_date_stc_0
   513 000068B9 3C33                <1> 	cmp	al, '3'
   514 000068BB 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 000068C1 B307                <1> 	mov	bl, 7
   519 000068C3 E8DBB3FFFF          <1> 	call	_write_tty
   520                              <1> loc_enter_day_2:
   521 000068C8 30E4                <1> 	xor     ah, ah
   522 000068CA E838A3FFFF          <1> 	call	int16h
   523                              <1> 	; AL = ASCII Code of the Character
   524 000068CF 3C1B                <1> 	cmp	al, 27
   525 000068D1 0F8484010000        <1>         je      loc_set_date_retn
   526 000068D7 A2[55F10000]        <1> 	mov	[Day+1], al
   527 000068DC 3C30                <1> 	cmp	al, '0'
   528 000068DE 0F828C010000        <1>         jb      loc_set_date_stc_1
   529 000068E4 3C39                <1> 	cmp	al, '9'
   530 000068E6 0F8784010000        <1>         ja      loc_set_date_stc_1
   531 000068EC 803D[54F10000]33    <1> 	cmp	byte [Day], '3'
   532 000068F3 7208                <1> 	jb	short pass_set_day_31
   533 000068F5 3C31                <1> 	cmp	al, '1'
   534 000068F7 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 000068FD B307                <1> 	mov	bl, 7
   540 000068FF E89FB3FFFF          <1> 	call	_write_tty
   541                              <1> loc_enter_separator_1:
   542 00006904 28E4                <1> 	sub     ah, ah ; 0
   543 00006906 E8FCA2FFFF          <1> 	call	int16h
   544                              <1> 	; AL = ASCII Code of the Character
   545 0000690B 3C1B                <1> 	cmp	al, 27
   546 0000690D 0F8448010000        <1>         je      loc_set_date_retn
   547 00006913 3C2D                <1> 	cmp	al, '-'
   548 00006915 7408                <1> 	je	short pass_set_date_separator_1
   549 00006917 3C2F                <1> 	cmp	al, '/'
   550 00006919 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 0000691F B307                <1> 	mov	bl, 7	
   556 00006921 E87DB3FFFF          <1> 	call	_write_tty
   557                              <1> loc_enter_month_1:
   558 00006926 30E4                <1> 	xor     ah, ah ; 0
   559 00006928 E8DAA2FFFF          <1> 	call	int16h
   560                              <1> 	; AL = ASCII Code of the Character
   561 0000692D 3C1B                <1> 	cmp	al, 27
   562 0000692F 0F8426010000        <1>         je      loc_set_date_retn
   563 00006935 A2[57F10000]        <1> 	mov	[Month], al
   564 0000693A 3C30                <1> 	cmp	al, '0'
   565 0000693C 0F8264010000        <1>         jb      loc_set_date_stc_3
   566 00006942 3C31                <1> 	cmp	al, '1'
   567 00006944 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 0000694A B307                <1> 	mov	bl, 7
   572 0000694C E852B3FFFF          <1> 	call	_write_tty
   573                              <1> loc_enter_month_2:
   574 00006951 30E4                <1> 	xor     ah, ah
   575 00006953 E8AFA2FFFF          <1> 	call	int16h
   576                              <1> 	; AL = ASCII Code of the Character
   577 00006958 3C1B                <1> 	cmp	al, 27
   578 0000695A 0F84FB000000        <1>         je      loc_set_date_retn
   579 00006960 A2[58F10000]        <1> 	mov	[Month+1], al
   580 00006965 3C30                <1> 	cmp	al, '0'
   581 00006967 0F8254010000        <1>         jb      loc_set_date_stc_4
   582 0000696D 3C39                <1> 	cmp	al, '9'
   583 0000696F 0F874C010000        <1>         ja      loc_set_date_stc_4
   584 00006975 803D[57F10000]31    <1> 	cmp	byte [Month], '1'
   585 0000697C 7208                <1> 	jb	short pass_set_month_12
   586 0000697E 3C32                <1> 	cmp	al, '2'
   587 00006980 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 00006986 B307                <1> 	mov	bl, 7	
   593 00006988 E816B3FFFF          <1> 	call	_write_tty
   594                              <1> loc_enter_separator_2:
   595 0000698D 28E4                <1> 	sub     ah, ah
   596 0000698F E873A2FFFF          <1> 	call	int16h
   597                              <1> 	; AL = ASCII Code of the Character
   598 00006994 3C1B                <1> 	cmp	al, 27
   599 00006996 0F84BF000000        <1>         je      loc_set_date_retn
   600 0000699C 3C2D                <1> 	cmp	al, '-'
   601 0000699E 7408                <1> 	je	short pass_set_date_separator_2
   602 000069A0 3C2F                <1> 	cmp	al, '/'
   603 000069A2 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 000069A8 B307                <1> 	mov	bl, 7
   609 000069AA E8F4B2FFFF          <1> 	call	_write_tty
   610                              <1> loc_enter_year_1:
   611 000069AF 30E4                <1> 	xor    ah, ah
   612 000069B1 E851A2FFFF          <1> 	call	int16h
   613                              <1> 	; AL = ASCII Code of the Character
   614 000069B6 3C1B                <1> 	cmp	al, 27
   615 000069B8 0F849D000000        <1>         je      loc_set_date_retn
   616 000069BE A2[5CF10000]        <1> 	mov	[Year], al
   617 000069C3 3C30                <1> 	cmp	al, '0'
   618 000069C5 0F822C010000        <1>         jb      loc_set_date_stc_6
   619 000069CB 3C39                <1> 	cmp	al, '9'
   620 000069CD 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 000069D3 B307                <1> 	mov	bl, 7	
   625 000069D5 E8C9B2FFFF          <1> 	call	_write_tty
   626                              <1> loc_enter_year_2:
   627 000069DA 30E4                <1> 	xor	ah, ah
   628 000069DC E826A2FFFF          <1> 	call	int16h
   629                              <1> 	; AL = ASCII Code of the Character
   630 000069E1 3C1B                <1> 	cmp	al, 27
   631 000069E3 7476                <1> 	je	short loc_set_date_retn
   632 000069E5 A2[5DF10000]        <1> 	mov	byte [Year+1], al
   633 000069EA 3C30                <1> 	cmp	al, '0'
   634 000069EC 0F8220010000        <1>         jb      loc_set_date_stc_7
   635 000069F2 3C39                <1> 	cmp	al, '9'
   636 000069F4 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 000069FA B307                <1> 	mov	bl, 7	
   641 000069FC E8A2B2FFFF          <1> 	call	_write_tty
   642                              <1> loc_set_date_get_lchar_again:
   643 00006A01 28E4                <1> 	sub	ah, ah ; 0
   644 00006A03 E8FFA1FFFF          <1> 	call	int16h
   645                              <1> 	; AL = ASCII Code of the Character
   646 00006A08 3C0D                <1> 	cmp	al, 13 ; ENTER key
   647 00006A0A 7412                <1> 	je	short loc_set_date_progress
   648 00006A0C 3C1B                <1> 	cmp	al, 27 ; ESC key
   649 00006A0E 744B                <1> 	je	short loc_set_date_retn
   650                              <1> 	;
   651 00006A10 E82A010000          <1> 	call	check_for_backspace
   652 00006A15 75EA                <1> 	jne	short loc_set_date_get_lchar_again
   653                              <1> 
   654                              <1> loc_set_date_bs_8:
   655 00006A17 E811010000          <1> 	call	write_backspace
   656 00006A1C 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 00006A1E E870EFFFFF          <1> 	call	RTC_40	; GET RTC DATE
   663                              <1> 	; CH = century (in BCD)
   664                              <1> 
   665 00006A23 66A1[5CF10000]      <1> 	mov	ax, [Year]
   666 00006A29 662D3030            <1> 	sub	ax, '00'
   667 00006A2D C0E004              <1> 	shl	al, 4 ; * 16
   668 00006A30 88C1                <1> 	mov	cl, al
   669 00006A32 00E1                <1> 	add	cl, ah
   670 00006A34 66A1[57F10000]      <1> 	mov	ax, [Month]
   671 00006A3A 662D3030            <1> 	sub	ax, '00'
   672 00006A3E C0E004              <1> 	shl	al, 4 ; * 16
   673 00006A41 88C6                <1> 	mov	dh, al
   674 00006A43 00E6                <1> 	add	dh, ah
   675 00006A45 66A1[54F10000]      <1> 	mov	ax, [Day]
   676 00006A4B 662D3030            <1> 	sub	ax, '00'
   677 00006A4F C0E004              <1> 	shl	al, 4 ; * 16
   678 00006A52 88C2                <1> 	mov	dl, al
   679 00006A54 00E2                <1> 	add	dl, ah
   680                              <1> 
   681                              <1> 	;mov	ah, 05h
   682                              <1> 	;call	int1Ah
   683 00006A56 E865EFFFFF          <1> 	call	RTC_50	; SET RTC DATE
   684                              <1> 
   685                              <1> loc_set_date_retn:
   686 00006A5B BE[97020100]        <1> 	mov	esi, nextline
   687 00006A60 E80CF2FFFF          <1> 	call	print_msg
   688 00006A65 C3                  <1> 	retn
   689                              <1> 
   690                              <1> loc_set_date_stc_0:
   691                              <1> 	;xor	bh, bh ; video page 0
   692 00006A66 E818B3FFFF          <1> 	call	beeper ; BEEP !
   693 00006A6B E925FEFFFF          <1>         jmp     loc_enter_day_1
   694                              <1> loc_set_date_stc_1:
   695 00006A70 E8CA000000          <1> 	call	check_for_backspace
   696 00006A75 740A                <1> 	je	short loc_set_date_bs_1
   697                              <1> 	;xor	bh, bh ; video page 0
   698 00006A77 E807B3FFFF          <1> 	call	beeper ; BEEP !
   699 00006A7C E947FEFFFF          <1>         jmp     loc_enter_day_2
   700                              <1> loc_set_date_bs_1:
   701 00006A81 E8A7000000          <1> 	call	write_backspace
   702 00006A86 E90AFEFFFF          <1>         jmp     loc_enter_day_1
   703                              <1> loc_set_date_stc_2:
   704 00006A8B E8AF000000          <1> 	call	check_for_backspace
   705 00006A90 740A                <1> 	je	short loc_set_date_bs_2
   706                              <1> 	;xor	bh, bh ; video page 0
   707 00006A92 E8ECB2FFFF          <1> 	call	beeper ; BEEP !
   708 00006A97 E968FEFFFF          <1>         jmp     loc_enter_separator_1
   709                              <1> loc_set_date_bs_2:
   710 00006A9C E88C000000          <1> 	call	write_backspace
   711 00006AA1 E922FEFFFF          <1>         jmp     loc_enter_day_2
   712                              <1> loc_set_date_stc_3:
   713 00006AA6 E894000000          <1> 	call	check_for_backspace	
   714 00006AAB 740A                <1> 	je short loc_set_date_bs_3
   715                              <1> 	;xor	bh, bh ; video page 0
   716 00006AAD E8D1B2FFFF          <1> 	call	beeper ; BEEP !
   717 00006AB2 E96FFEFFFF          <1>         jmp     loc_enter_month_1
   718                              <1> loc_set_date_bs_3:
   719 00006AB7 E871000000          <1> 	call	write_backspace
   720 00006ABC E943FEFFFF          <1>         jmp     loc_enter_separator_1
   721                              <1> loc_set_date_stc_4:
   722 00006AC1 E879000000          <1> 	call	check_for_backspace	
   723 00006AC6 740A                <1> 	je	short loc_set_date_bs_4
   724                              <1> 	;xor	bh, bh ; video page 0
   725 00006AC8 E8B6B2FFFF          <1> 	call	beeper ; BEEP !
   726 00006ACD E97FFEFFFF          <1>         jmp     loc_enter_month_2
   727                              <1> loc_set_date_bs_4:
   728 00006AD2 E856000000          <1> 	call	write_backspace
   729 00006AD7 E94AFEFFFF          <1>         jmp     loc_enter_month_1
   730                              <1> loc_set_date_stc_5:
   731 00006ADC E85E000000          <1> 	call	check_for_backspace
   732 00006AE1 740A                <1> 	je	short loc_set_date_bs_5
   733                              <1> 	;xor	bh, bh ; video page 0
   734 00006AE3 E89BB2FFFF          <1> 	call	beeper ; BEEP !
   735 00006AE8 E9A0FEFFFF          <1>         jmp     loc_enter_separator_2
   736                              <1> loc_set_date_bs_5:
   737 00006AED E83B000000          <1> 	call	write_backspace
   738 00006AF2 E95AFEFFFF          <1>         jmp     loc_enter_month_2
   739                              <1> loc_set_date_stc_6:
   740 00006AF7 E843000000          <1> 	call	check_for_backspace
   741 00006AFC 740A                <1>         je      short  loc_set_date_bs_6
   742                              <1> 	;xor	bh, bh ; video page 0
   743 00006AFE E880B2FFFF          <1> 	call	beeper ; BEEP !
   744 00006B03 E9A7FEFFFF          <1>         jmp     loc_enter_year_1
   745                              <1> loc_set_date_bs_6:
   746 00006B08 E820000000          <1> 	call	write_backspace
   747 00006B0D E97BFEFFFF          <1>         jmp     loc_enter_separator_2
   748                              <1> loc_set_date_stc_7:
   749 00006B12 E828000000          <1> 	call	check_for_backspace
   750 00006B17 740A                <1> 	je	short loc_set_date_bs_7
   751                              <1> 	;xor	bh, bh ; video page 0
   752 00006B19 E865B2FFFF          <1> 	call	beeper ; BEEP !
   753 00006B1E E9B7FEFFFF          <1>         jmp     loc_enter_year_2
   754                              <1> loc_set_date_bs_7:
   755 00006B23 E805000000          <1> 	call	write_backspace
   756 00006B28 E982FEFFFF          <1>         jmp     loc_enter_year_1
   757                              <1> 
   758                              <1> write_backspace:
   759                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   760 00006B2D B008                <1> 	mov	al, 08h ; BACKSPACE
   761                              <1> 	; 13/05/2016
   762 00006B2F 66BB0700            <1> 	mov	bx, 7 ; bl = attribute/color
   763                              <1> 		      ; bh = video page = 0	
   764 00006B33 E86BB1FFFF          <1> 	call	_write_tty
   765 00006B38 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 00006B3A E9EBB0FFFF          <1> 	jmp	_write_c_current
   770                              <1> 
   771                              <1> check_for_backspace:
   772                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   773 00006B3F 663D080E            <1> 	cmp	ax, 0E08h
   774 00006B43 7410                <1> 	je	short cfbs_retn
   775 00006B45 663DE04B            <1> 	cmp	ax, 4BE0h
   776 00006B49 740A                <1> 	je	short cfbs_retn
   777 00006B4B 663D004B            <1> 	cmp	ax, 4B00h
   778 00006B4F 7404                <1> 	je	short cfbs_retn
   779 00006B51 663DE053            <1> 	cmp	ax, 53E0h
   780                              <1> cfbs_retn:
   781 00006B55 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 00006B56 E8C7EDFFFF          <1> 	call	RTC_20	; GET RTC TIME
   790                              <1> 	
   791 00006B5B 88E8                <1> 	mov	al, ch
   792 00006B5D E89CA0FFFF          <1> 	call	bcd_to_ascii
   793 00006B62 66A3[82F10000]      <1> 	mov	[Hour], ax
   794                              <1> 
   795 00006B68 88C8                <1> 	mov	al, cl
   796 00006B6A E88FA0FFFF          <1> 	call	bcd_to_ascii
   797 00006B6F 66A3[85F10000]      <1> 	mov	[Minute], ax
   798                              <1> 
   799 00006B75 88F0                <1> 	mov	al, dh
   800 00006B77 E882A0FFFF          <1> 	call	bcd_to_ascii
   801 00006B7C 66A3[88F10000]      <1> 	mov	[Second], ax
   802                              <1> 
   803 00006B82 BE[72F10000]        <1> 	mov	esi, Msg_Show_Time
   804 00006B87 E8E5F0FFFF          <1> 	call	print_msg
   805 00006B8C 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 00006B8D BE[61F10000]        <1> 	mov 	esi, Msg_Enter_Time
   813 00006B92 E8DAF0FFFF          <1> 	call	print_msg
   814                              <1> 
   815                              <1> loc_enter_hour_1:
   816 00006B97 30E4                <1> 	xor     ah, ah
   817 00006B99 E869A0FFFF          <1> 	call	int16h
   818                              <1> 	; AL = ASCII Code of the Character
   819 00006B9E 3C0D                <1> 	cmp	al, 13 ; ENTER key
   820 00006BA0 0F84AE010000        <1>         je      loc_set_time_retn
   821 00006BA6 3C1B                <1> 	cmp	al, 27 ; ESC key
   822 00006BA8 0F84A6010000        <1>         je      loc_set_time_retn
   823 00006BAE A2[82F10000]        <1> 	mov	[Hour], al
   824 00006BB3 3C30                <1> 	cmp	al, '0'
   825 00006BB5 0F82A4010000        <1>         jb      loc_set_time_stc_0
   826 00006BBB 3C32                <1> 	cmp	al, '2'
   827 00006BBD 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 00006BC3 B307                <1> 	mov	bl, 7	
   832 00006BC5 E8D9B0FFFF          <1> 	call	_write_tty
   833                              <1> loc_enter_hour_2:
   834 00006BCA 30E4                <1> 	xor     ah, ah
   835 00006BCC E836A0FFFF          <1> 	call	int16h
   836                              <1> 	; AL = ASCII Code of the Character
   837 00006BD1 3C1B                <1> 	cmp	al, 27
   838 00006BD3 0F847B010000        <1>         je      loc_set_time_retn
   839 00006BD9 A2[83F10000]        <1> 	mov	[Hour+1], al
   840 00006BDE 3C30                <1> 	cmp	al, '0'
   841 00006BE0 0F8283010000        <1>         jb      loc_set_time_stc_1
   842 00006BE6 3C39                <1> 	cmp	al, '9'
   843 00006BE8 0F877B010000        <1> 	ja	loc_set_time_stc_1
   844 00006BEE 803D[82F10000]32    <1>         cmp     byte [Hour], '2'
   845 00006BF5 7208                <1> 	jb	short pass_set_time_24
   846 00006BF7 3C34                <1> 	cmp	al, '4'
   847 00006BF9 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 00006BFF B307                <1> 	mov	bl, 7	
   853 00006C01 E89DB0FFFF          <1> 	call	_write_tty
   854                              <1> loc_enter_time_separator_1:
   855 00006C06 28E4                <1> 	sub    ah, ah ; 0
   856 00006C08 E8FA9FFFFF          <1> 	call	int16h
   857                              <1> 	; AL = ASCII Code of the Character
   858 00006C0D 3C1B                <1> 	cmp	al, 27
   859 00006C0F 0F843F010000        <1>         je      loc_set_time_retn
   860 00006C15 3C3A                <1> 	cmp	al, ':'
   861 00006C17 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 00006C1D B307                <1> 	mov	bl, 7	
   866 00006C1F E87FB0FFFF          <1> 	call	_write_tty
   867                              <1> loc_enter_minute_1:
   868 00006C24 30E4                <1> 	xor     ah, ah
   869 00006C26 E8DC9FFFFF          <1> 	call	int16h
   870                              <1> 	; AL = ASCII Code of the Character
   871 00006C2B 3C1B                <1> 	cmp	al, 27
   872 00006C2D 0F8421010000        <1>         je      loc_set_time_retn
   873 00006C33 A2[85F10000]        <1> 	mov	[Minute], al
   874 00006C38 3C30                <1> 	cmp	al, '0'
   875 00006C3A 0F825F010000        <1>         jb      loc_set_time_stc_3
   876 00006C40 3C35                <1> 	cmp	al, '5'
   877 00006C42 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 00006C48 B307                <1> 	mov	bl, 7	
   882 00006C4A E854B0FFFF          <1> 	call	_write_tty
   883                              <1> loc_enter_minute_2:
   884 00006C4F 30E4                <1> 	xor     ah, ah
   885 00006C51 E8B19FFFFF          <1> 	call	int16h
   886                              <1> 	; AL = ASCII Code of the Character
   887 00006C56 3C1B                <1> 	cmp	al, 27
   888 00006C58 0F84F6000000        <1>         je      loc_set_time_retn
   889 00006C5E A2[86F10000]        <1> 	mov	[Minute+1], al
   890 00006C63 3C30                <1> 	cmp	al, '0'
   891 00006C65 0F824F010000        <1>         jb      loc_set_time_stc_4
   892 00006C6B 3C39                <1> 	cmp	al, '9'
   893 00006C6D 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 00006C73 B307                <1> 	mov	bl, 7	
   898 00006C75 E829B0FFFF          <1> 	call	_write_tty
   899                              <1> loc_enter_time_separator_2:
   900 00006C7A 66C705[88F10000]30- <1> 	mov	word [Second], 3030h
   900 00006C82 30                  <1>
   901 00006C83 28E4                <1> 	sub     ah, ah
   902 00006C85 E87D9FFFFF          <1> 	call	int16h
   903                              <1> 	; AL = ASCII Code of the Character
   904 00006C8A 3C0D                <1> 	cmp	al, 13
   905 00006C8C 0F8485000000        <1>         je      loc_set_time_progress
   906 00006C92 3C1B                <1> 	cmp	al, 27
   907 00006C94 0F84BA000000        <1>         je      loc_set_time_retn
   908 00006C9A 3C3A                <1> 	cmp	al, ':'
   909 00006C9C 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 00006CA2 B307                <1> 	mov	bl, 7	
   914 00006CA4 E8FAAFFFFF          <1> 	call	_write_tty
   915                              <1> loc_enter_second_1:
   916 00006CA9 30E4                <1> 	xor     ah, ah
   917 00006CAB E8579FFFFF          <1> 	call	int16h
   918                              <1> 	; AL = ASCII Code of the Character
   919 00006CB0 3C0D                <1> 	cmp	al, 13
   920 00006CB2 7463                <1> 	je	short loc_set_time_progress
   921 00006CB4 3C1B                <1> 	cmp	al, 27
   922 00006CB6 0F8498000000        <1>         je      loc_set_time_retn
   923 00006CBC A2[88F10000]        <1> 	mov	[Second], al
   924 00006CC1 3C30                <1> 	cmp	al, '0'
   925 00006CC3 0F8227010000        <1>         jb      loc_set_time_stc_6
   926 00006CC9 3C35                <1> 	cmp	al, '5'
   927 00006CCB 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 00006CD1 B307                <1> 	mov	bl, 7	
   932 00006CD3 E8CBAFFFFF          <1> 	call	_write_tty
   933                              <1> loc_enter_second_2:
   934 00006CD8 30E4                <1> 	xor     ah, ah
   935 00006CDA E8289FFFFF          <1> 	call	int16h
   936                              <1> 	; AL = ASCII Code of the Character
   937 00006CDF 3C1B                <1> 	cmp	al, 27
   938 00006CE1 7471                <1> 	je	short loc_set_time_retn
   939 00006CE3 3C30                <1> 	cmp	al, '0'
   940 00006CE5 0F8229010000        <1>         jb      loc_set_time_stc_7
   941 00006CEB 3C39                <1> 	cmp	al, '9'
   942 00006CED 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 00006CF3 B307                <1> 	mov	bl, 7	
   947 00006CF5 E8A9AFFFFF          <1> 	call	_write_tty
   948                              <1> loc_set_time_get_lchar_again:
   949 00006CFA 28E4                <1> 	sub	ah, ah ; 0
   950 00006CFC E8069FFFFF          <1> 	call	int16h
   951                              <1> 	; AL = ASCII Code of the Character
   952 00006D01 3C0D                <1> 	cmp	al, 13
   953 00006D03 7412                <1> 	je	short loc_set_time_progress
   954 00006D05 3C1B                <1> 	cmp	al, 27
   955 00006D07 744B                <1> 	je	short loc_set_time_retn
   956                              <1> 	;
   957 00006D09 E831FEFFFF          <1> 	call	check_for_backspace
   958 00006D0E 75EA                <1> 	jne	short loc_set_time_get_lchar_again
   959                              <1> 
   960                              <1> loc_set_time_bs_8:
   961 00006D10 E818FEFFFF          <1> 	call	write_backspace
   962 00006D15 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 00006D17 E806ECFFFF          <1> 	call	RTC_20	; GET RTC TIME
   969                              <1> 	;DL = Daylight Savings Enable option (0-1)	
   970                              <1> 
   971 00006D1C 66A1[82F10000]      <1> 	mov	ax, [Hour]
   972 00006D22 662D3030            <1> 	sub	ax, '00'
   973 00006D26 C0E004              <1> 	shl	al, 4 ; * 16
   974 00006D29 88C5                <1> 	mov	ch, al
   975 00006D2B 00E5                <1> 	add	ch, ah
   976 00006D2D 66A1[85F10000]      <1> 	mov	ax, [Minute]
   977 00006D33 662D3030            <1> 	sub	ax, '00'
   978 00006D37 C0E004              <1> 	shl	al, 4 ; * 16
   979 00006D3A 88C1                <1> 	mov	cl, al
   980 00006D3C 00E1                <1> 	add	cl, ah
   981 00006D3E 66A1[88F10000]      <1> 	mov	ax, [Second]
   982 00006D44 662D3030            <1> 	sub	ax, '00'
   983 00006D48 C0E004              <1> 	shl	al, 4 ; * 16
   984 00006D4B 88C6                <1> 	mov	dh, al
   985 00006D4D 00E6                <1> 	add	dh, ah
   986                              <1> 	
   987                              <1> 	;mov	ah, 03h
   988                              <1> 	;call	int1Ah
   989 00006D4F E8FDEBFFFF          <1> 	call	RTC_30	; SET RTC TIME
   990                              <1> 
   991                              <1> loc_set_time_retn:
   992 00006D54 BE[97020100]        <1> 	mov 	esi, nextline
   993 00006D59 E813EFFFFF          <1> 	call	print_msg
   994 00006D5E C3                  <1> 	retn
   995                              <1> 
   996                              <1> loc_set_time_stc_0:
   997                              <1> 	;xor	bh, bh ; video page 0
   998 00006D5F E81FB0FFFF          <1> 	call	beeper ; BEEP !
   999 00006D64 E92EFEFFFF          <1>         jmp     loc_enter_hour_1
  1000                              <1> loc_set_time_stc_1:
  1001 00006D69 E8D1FDFFFF          <1> 	call	check_for_backspace
  1002 00006D6E 740A                <1> 	je	short loc_set_time_bs_1
  1003                              <1> 	;xor	bh, bh ; video page 0
  1004 00006D70 E80EB0FFFF          <1> 	call	beeper ; BEEP !
  1005 00006D75 E950FEFFFF          <1>         jmp     loc_enter_hour_2
  1006                              <1> loc_set_time_bs_1:
  1007 00006D7A E8AEFDFFFF          <1> 	call	write_backspace
  1008 00006D7F E913FEFFFF          <1>         jmp     loc_enter_hour_1
  1009                              <1> loc_set_time_stc_2:
  1010 00006D84 E8B6FDFFFF          <1> 	call	check_for_backspace
  1011 00006D89 740A                <1> 	je	short loc_set_time_bs_2
  1012                              <1> 	;xor	bh, bh ; video page 0
  1013 00006D8B E8F3AFFFFF          <1> 	call	beeper ; BEEP !
  1014 00006D90 E971FEFFFF          <1>         jmp     loc_enter_time_separator_1
  1015                              <1> loc_set_time_bs_2:
  1016 00006D95 E893FDFFFF          <1> 	call	write_backspace
  1017 00006D9A E92BFEFFFF          <1>         jmp     loc_enter_hour_2
  1018                              <1> loc_set_time_stc_3:
  1019 00006D9F E89BFDFFFF          <1> 	call	check_for_backspace
  1020 00006DA4 740A                <1> 	je	short loc_set_time_bs_3
  1021                              <1> 	;xor	bh, bh ; video page 0
  1022 00006DA6 E8D8AFFFFF          <1> 	call	beeper ; BEEP !6
  1023 00006DAB E974FEFFFF          <1>         jmp     loc_enter_minute_1
  1024                              <1> loc_set_time_bs_3:
  1025 00006DB0 E878FDFFFF          <1> 	call	write_backspace
  1026 00006DB5 E94CFEFFFF          <1>         jmp     loc_enter_time_separator_1
  1027                              <1> loc_set_time_stc_4:
  1028 00006DBA E880FDFFFF          <1> 	call	check_for_backspace
  1029 00006DBF 740A                <1> 	je	short loc_set_time_bs_4
  1030                              <1> 	;xor	bh, bh ; video page 0
  1031 00006DC1 E8BDAFFFFF          <1> 	call	beeper ; BEEP !
  1032 00006DC6 E984FEFFFF          <1>         jmp     loc_enter_minute_2
  1033                              <1> loc_set_time_bs_4:
  1034 00006DCB E85DFDFFFF          <1> 	call	write_backspace
  1035 00006DD0 E94FFEFFFF          <1>         jmp     loc_enter_minute_1
  1036                              <1> loc_set_time_stc_5:
  1037 00006DD5 E865FDFFFF          <1> 	call	check_for_backspace
  1038 00006DDA 740A                <1> 	je	short loc_set_time_bs_5
  1039                              <1> 	;xor	bh, bh ; video page 0
  1040 00006DDC E8A2AFFFFF          <1> 	call	beeper ; BEEP !
  1041 00006DE1 E994FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1042                              <1> loc_set_time_bs_5:
  1043 00006DE6 E842FDFFFF          <1> 	call	write_backspace
  1044 00006DEB E95FFEFFFF          <1>         jmp     loc_enter_minute_2
  1045                              <1> loc_set_time_stc_6:
  1046 00006DF0 E84AFDFFFF          <1> 	call	check_for_backspace
  1047 00006DF5 7413                <1> 	je	short loc_set_time_bs_6
  1048                              <1> 	;xor	bh, bh ; video page 0
  1049 00006DF7 E887AFFFFF          <1> 	call	beeper ; BEEP !
  1050 00006DFC 66C705[88F10000]30- <1> 	mov	word [Second], 3030h
  1050 00006E04 30                  <1>
  1051 00006E05 E99FFEFFFF          <1>         jmp     loc_enter_second_1
  1052                              <1> loc_set_time_bs_6:
  1053 00006E0A E81EFDFFFF          <1> 	call	write_backspace
  1054 00006E0F E966FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1055                              <1> loc_set_time_stc_7:
  1056 00006E14 E826FDFFFF          <1> 	call	check_for_backspace
  1057 00006E19 740A                <1> 	je	short loc_set_time_bs_7
  1058                              <1> 	;xor	bh, bh ; video page 0
  1059 00006E1B E863AFFFFF          <1> 	call	beeper ; BEEP !
  1060 00006E20 E9B3FEFFFF          <1>         jmp     loc_enter_second_2
  1061                              <1> loc_set_time_bs_7:
  1062 00006E25 E803FDFFFF          <1> 	call	write_backspace
  1063 00006E2A 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 00006E2F 88C4                <1> 	mov	ah, al
  1082 00006E31 28C0                <1> 	sub	al, al
  1083 00006E33 0FB7F0              <1> 	movzx	esi, ax	
  1084 00006E36 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1085 00006E3C 8A06                <1> 	mov	al, [esi]
  1086 00006E3E 3C41                <1> 	cmp	al, 'A'  
  1087 00006E40 7304                <1> 	jnb	short loc_pvi_set_vol_name
  1088 00006E42 8A6604              <1> 	mov	ah, [esi+LD_FSType]
  1089 00006E45 C3                  <1> 	retn
  1090                              <1> 
  1091                              <1> loc_pvi_set_vol_name:
  1092 00006E46 A2[BCF10000]        <1> 	mov	[Vol_Drv_Name], al
  1093 00006E4B 56                  <1> 	push	esi
  1094 00006E4C E858010000          <1> 	call	move_volume_name_and_serial_no ;;;
  1095 00006E51 7302                <1> 	jnc	short loc_pvi_mvn_ok
  1096 00006E53 5E                  <1> 	pop	esi
  1097 00006E54 C3                  <1> 	retn
  1098                              <1> 
  1099                              <1> loc_pvi_mvn_ok:
  1100 00006E55 8B3424              <1> 	mov	esi, [esp]
  1101 00006E58 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1102 00006E5C 7509                <1> 	jne	short loc_pvi_fat_vol_size
  1103 00006E5E 8B4670              <1> 	mov	eax, [esi+LD_FS_VolumeSize]
  1104 00006E61 0FB75E11            <1> 	movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1105 00006E65 EB07                <1> 	jmp	short loc_vol_size_mul32
  1106                              <1> loc_pvi_fat_vol_size:
  1107 00006E67 8B4670              <1> 	mov	eax, [esi+LD_TotalSectors]
  1108 00006E6A 0FB75E11            <1> 	movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1109                              <1> loc_vol_size_mul32:
  1110 00006E6E F7E3                <1> 	mul	ebx
  1111 00006E70 09D2                <1> 	or	edx, edx
  1112 00006E72 7507                <1> 	jnz	short loc_vol_size_in_kbytes
  1113                              <1> loc_vol_size_in_bytes:
  1114 00006E74 B9[9AF10000]        <1> 	mov	ecx, VolSize_Bytes
  1115 00006E79 EB0D                <1> 	jmp	short loc_write_vol_size_str
  1116                              <1> loc_vol_size_in_kbytes:
  1117 00006E7B 66BB0004            <1> 	mov	bx, 1024
  1118 00006E7F F7F3                <1> 	div	ebx
  1119 00006E81 B9[8DF10000]        <1> 	mov 	ecx, VolSize_KiloBytes
  1120 00006E86 31D2                <1> 	xor	edx, edx ; 0
  1121                              <1> loc_write_vol_size_str:
  1122 00006E88 890D[A73C0100]      <1> 	mov	[VolSize_Unit1], ecx
  1123                              <1> 	; 
  1124 00006E8E BF[BD3C0100]        <1> 	mov	edi, Vol_Tot_Sec_Str_End
  1125                              <1>         ;mov	byte [edi], 0
  1126 00006E93 B90A000000          <1> 	mov	ecx, 10
  1127                              <1> loc_write_vol_size_chr:
  1128 00006E98 F7F1                <1> 	div	ecx
  1129 00006E9A 80C230              <1> 	add	dl, '0'
  1130 00006E9D 4F                  <1> 	dec	edi	
  1131 00006E9E 8817                <1> 	mov	[edi], dl
  1132 00006EA0 85C0                <1> 	test	eax, eax
  1133 00006EA2 7404                <1> 	jz	short loc_write_vol_size_str_ok
  1134 00006EA4 28D2                <1> 	sub	dl, dl ; 0
  1135 00006EA6 EBF0                <1> 	jmp	short loc_write_vol_size_chr
  1136                              <1> 
  1137                              <1> loc_write_vol_size_str_ok:
  1138 00006EA8 893D[AF3C0100]      <1> 	mov	[Vol_Tot_Sec_Str_Start], edi
  1139                              <1> 	;
  1140 00006EAE BF[A5F10000]        <1> 	mov	edi, Vol_FS_Name
  1141 00006EB3 8A4E03              <1> 	mov	cl, [esi+LD_FATType]
  1142 00006EB6 20C9                <1> 	and	cl, cl ; 0 ?
  1143 00006EB8 7515                <1> 	jnz	short loc_write_vol_FAT_str_1
  1144 00006EBA 66C7075452          <1> 	mov	word [edi], 'TR'
  1145 00006EBF C7470420465331      <1> 	mov	dword [edi+4], ' FS1'
  1146                              <1> 	;movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1147 00006EC6 668B5E11            <1> 	mov	bx, [esi+LD_FS_BytesPerSec]
  1148 00006ECA 8B4674              <1> 	mov	eax, [esi+LD_FS_FreeSectors]
  1149 00006ECD EB36                <1> 	jmp	short loc_vol_freespace_mul32
  1150                              <1> 
  1151                              <1> loc_write_vol_FAT_str_1:
  1152 00006ECF 66B83332            <1> 	mov	ax, '32' ; FAT32
  1153 00006ED3 80F902              <1> 	cmp	cl, 2 ; [esi+LD_FATType]
  1154 00006ED6 7708                <1> 	ja	short loc_write_vol_FAT_str_2
  1155 00006ED8 66B83132            <1> 	mov	ax, '12' ; FAT12
  1156 00006EDC 7202                <1> 	jb	short loc_write_vol_FAT_str_2
  1157 00006EDE B436                <1> 	mov	ah, '6'  ; FAT16
  1158                              <1> loc_write_vol_FAT_str_2:
  1159 00006EE0 C70746415420        <1> 	mov	dword [edi], 'FAT '
  1160 00006EE6 66894704            <1> 	mov	word [edi+4], ax
  1161                              <1> 	;
  1162                              <1> 	;movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1163 00006EEA 668B5E11            <1> 	mov	bx, [esi+LD_BPB+BPB_BytsPerSec]
  1164 00006EEE 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors]
  1165                              <1> 
  1166                              <1> loc_vol_freespace_recalc0:
  1167                              <1> 	; 01/03/2016
  1168 00006EF1 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  1169 00006EF4 720F                <1> 	jb	short loc_vol_freespace_mul32
  1170                              <1> 	;inc	eax ; 0
  1171 00006EF6 20C9                <1> 	and	cl, cl ; byte [esi+LD_FATType]
  1172 00006EF8 740B                <1> 	jz	short loc_vol_freespace_mul32 	
  1173 00006EFA 53                  <1> 	push	ebx
  1174 00006EFB 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free sectors
  1175 00006EFF E8A9490000          <1> 	call	calculate_fat_freespace
  1176 00006F04 5B                  <1> 	pop	ebx
  1177                              <1> 
  1178                              <1> loc_vol_freespace_mul32:
  1179 00006F05 F7E3                <1> 	mul	ebx
  1180 00006F07 09D2                <1> 	or	edx, edx
  1181 00006F09 7507                <1> 	jnz	short loc_vol_fspace_in_kbytes
  1182                              <1> loc_vol_fspace_in_bytes:
  1183 00006F0B B9[9AF10000]        <1> 	mov	ecx, VolSize_Bytes
  1184 00006F10 EB0D                <1> 	jmp	short loc_write_vol_fspace_str
  1185                              <1> loc_vol_fspace_in_kbytes:
  1186 00006F12 66BB0004            <1> 	mov	bx, 1024
  1187 00006F16 F7F3                <1> 	div	ebx
  1188 00006F18 B9[8DF10000]        <1> 	mov 	ecx, VolSize_KiloBytes
  1189 00006F1D 31D2                <1> 	xor	edx, edx ; 0
  1190                              <1> loc_write_vol_fspace_str:
  1191 00006F1F 890D[AB3C0100]      <1> 	mov	[VolSize_Unit2], ecx
  1192                              <1> 	;	
  1193 00006F25 BF[CD3C0100]        <1> 	mov	edi, Vol_Free_Sectors_Str_End
  1194                              <1>         ;mov	byte [edi], 0
  1195 00006F2A B90A000000          <1> 	mov	ecx, 10
  1196                              <1> loc_write_vol_fspace_chr:
  1197 00006F2F F7F1                <1> 	div	ecx
  1198 00006F31 80C230              <1> 	add	dl, '0'
  1199 00006F34 4F                  <1> 	dec	edi	
  1200 00006F35 8817                <1> 	mov	[edi], dl
  1201 00006F37 85C0                <1> 	test	eax, eax
  1202 00006F39 7404                <1> 	jz	short loc_write_vol_fspace_str_ok
  1203 00006F3B 28D2                <1> 	sub	dl, dl ; 0
  1204 00006F3D EBF0                <1> 	jmp	short loc_write_vol_fspace_chr
  1205                              <1> 
  1206                              <1> loc_write_vol_fspace_str_ok:
  1207 00006F3F 893D[BF3C0100]      <1> 	mov	[Vol_Free_Sectors_Str_Start], edi
  1208                              <1> 	;
  1209 00006F45 BE[A3F10000]        <1> 	mov	esi, Volume_in_drive
  1210 00006F4A E822EDFFFF          <1> 	call	print_msg
  1211 00006F4F BE[E3F10000]        <1> 	mov	esi, Vol_Name
  1212 00006F54 E818EDFFFF          <1> 	call	print_msg
  1213 00006F59 BE[97020100]        <1> 	mov	esi, nextline
  1214 00006F5E E80EEDFFFF          <1> 	call	print_msg
  1215                              <1> 	;
  1216 00006F63 BE[44F20000]        <1> 	mov	esi, Vol_Total_Sector_Header
  1217 00006F68 E804EDFFFF          <1> 	call	print_msg
  1218 00006F6D 8B35[AF3C0100]      <1> 	mov	esi, [Vol_Tot_Sec_Str_Start]
  1219 00006F73 E8F9ECFFFF          <1> 	call	print_msg
  1220 00006F78 8B35[A73C0100]      <1> 	mov	esi, [VolSize_Unit1]
  1221 00006F7E E8EEECFFFF          <1> 	call	print_msg
  1222                              <1> 	;
  1223 00006F83 BE[55F20000]        <1> 	mov	esi, Vol_Free_Sectors_Header
  1224 00006F88 E8E4ECFFFF          <1> 	call	print_msg
  1225 00006F8D 8B35[BF3C0100]      <1> 	mov	esi, [Vol_Free_Sectors_Str_Start]
  1226 00006F93 E8D9ECFFFF          <1> 	call	print_msg
  1227 00006F98 8B35[AB3C0100]      <1> 	mov	esi, [VolSize_Unit2]
  1228 00006F9E E8CEECFFFF          <1> 	call	print_msg
  1229                              <1> 	;
  1230 00006FA3 5E                  <1> 	pop	esi
  1231                              <1> 	
  1232                              <1> 	;mov	ah, [esi+LD_FSType]
  1233                              <1> 	;mov	al, [esi+LD_FATType]
  1234 00006FA4 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1235                              <1> 
  1236 00006FA8 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 00006FA9 BF[E3F10000]        <1> 	mov 	edi, Vol_Name
  1254                              <1> 
  1255                              <1> 	;mov	ah, [esi+LD_FSType]
  1256                              <1> 	;mov	al, [esi+LD_FATType]
  1257 00006FAE 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1258 00006FB2 80FCA1              <1> 	cmp	ah, 0A1h
  1259 00006FB5 7418                <1> 	je	short mvn_2
  1260 00006FB7 08E4                <1> 	or	ah, ah
  1261 00006FB9 7404                <1> 	jz	short mvn_0
  1262 00006FBB 08C0                <1> 	or	al, al
  1263 00006FBD 7504                <1> 	jnz	short mvn_1
  1264                              <1> mvn_0:
  1265 00006FBF 8A06                <1> 	mov	al, [esi]
  1266 00006FC1 F9                  <1> 	stc
  1267 00006FC2 C3                  <1> 	retn
  1268                              <1> mvn_1:
  1269 00006FC3 3C02                <1> 	cmp	al, 2
  1270 00006FC5 7717                <1> 	ja	short mvn_3 
  1271                              <1> 	;or	al, al
  1272                              <1> 	;jz	short mvn_2
  1273 00006FC7 8B462D              <1> 	mov	eax, [esi+LD_BPB+VolumeID]
  1274 00006FCA 83C631              <1> 	add	esi, LD_BPB+VolumeLabel
  1275 00006FCD EB15                <1> 	jmp	short mvn_4
  1276                              <1> mvn_2:
  1277 00006FCF 8B4628              <1> 	mov	eax, [esi+LD_FS_VolumeSerial]
  1278 00006FD2 83C62C              <1> 	add	esi, LD_FS_VolumeName
  1279 00006FD5 B910000000          <1> 	mov	ecx, 16
  1280 00006FDA F3A5                <1> 	rep	movsd
  1281 00006FDC EB10                <1> 	jmp	short mvn_5
  1282                              <1> mvn_3:
  1283 00006FDE 8B4649              <1> 	mov	eax, [esi+LD_BPB+FAT32_VolID]
  1284 00006FE1 83C64D              <1> 	add	esi, LD_BPB+FAT32_VolLab
  1285                              <1> mvn_4:
  1286 00006FE4 B90B000000          <1> 	mov	ecx, 11
  1287 00006FE9 F3A4                <1> 	rep	movsb
  1288 00006FEB C60700              <1> 	mov	byte [edi], 0
  1289                              <1> mvn_5:
  1290                              <1> 	;mov	[Current_VolSerial], eax  
  1291 00006FEE E807C3FFFF          <1> 	call	dwordtohex
  1292 00006FF3 8915[38F20000]      <1> 	mov	[Vol_Serial1], edx
  1293 00006FF9 A3[3DF20000]        <1> 	mov	[Vol_Serial2], eax
  1294                              <1> 	; ecx = 0
  1295 00006FFE 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 00006FFF 31DB                <1> 	xor	ebx, ebx
  1308 00007001 88D7                <1> 	mov	bh, dl
  1309 00007003 3815[14F00000]      <1> 	cmp	[Last_DOS_DiskNo], dl
  1310 00007009 7304                <1> 	jnb	short loc_gvsn_start
  1311                              <1> loc_gvsn_stc_retn:
  1312 0000700B 31C0                <1> 	xor	eax, eax
  1313 0000700D F9                  <1> 	stc 
  1314 0000700E C3                  <1>         retn 
  1315                              <1> loc_gvsn_start:
  1316 0000700F 56                  <1> 	push	esi
  1317 00007010 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1318 00007015 01DE                <1> 	add	esi, ebx
  1319 00007017 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
  1320 0000701A 20DB                <1> 	and	bl, bl
  1321 0000701C 740F                <1> 	jz	short loc_gvsn_fs
  1322 0000701E 80FB02              <1> 	cmp	bl, 2
  1323 00007021 7705                <1> 	ja	short loc_gvsn_fat32
  1324                              <1> loc_gvsn_fat:
  1325 00007023 83C62D              <1> 	add	esi, LD_BPB + VolumeID
  1326 00007026 EB0E                <1> 	jmp	short loc_gvsn_return
  1327                              <1> loc_gvsn_fat32: 
  1328 00007028 83C649              <1> 	add	esi, LD_BPB + FAT32_VolID
  1329 0000702B EB09                <1> 	jmp	short loc_gvsn_return 
  1330                              <1> loc_gvsn_fs:
  1331 0000702D 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1332 00007031 75D8                <1> 	jne	short loc_gvsn_stc_retn 
  1333 00007033 83C628              <1> 	add	esi, LD_FS_VolumeSerial
  1334                              <1> loc_gvsn_return:
  1335 00007036 8B06                <1> 	mov	eax, [esi]
  1336 00007038 5E                  <1> 	pop	esi
  1337 00007039 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 0000703A C605[603D0100]00    <1> 	mov	byte [Program_Exit],0
  1360 00007041 80F904              <1> 	cmp	cl, 4
  1361 00007044 0F87AE020000        <1>         ja      c_6
  1362 0000704A 0F822E010000        <1>         jb      c_2
  1363                              <1> c_4:
  1364                              <1> 
  1365                              <1> cmp_cmd_exit:
  1366 00007050 BF[82F00000]        <1> 	mov	edi, Cmd_Exit
  1367 00007055 E8BA030000          <1> 	call	cmp_cmd	
  1368 0000705A 7208                <1> 	jc	short cmp_cmd_date
  1369                              <1> 
  1370 0000705C C605[603D0100]01    <1>         mov     byte [Program_Exit], 1
  1371 00007063 C3                  <1>         retn
  1372                              <1> 
  1373                              <1> cmp_cmd_date:
  1374 00007064 B104                <1> 	mov	cl, 4
  1375 00007066 BF[9EF00000]        <1> 	mov	edi, Cmd_Date
  1376 0000706B E8A4030000          <1> 	call	cmp_cmd	
  1377 00007070 720B                <1>         jc	short cmp_cmd_time
  1378                              <1> 	
  1379 00007072 E8D0F7FFFF          <1> 	call	show_date
  1380 00007077 E80FF8FFFF          <1> 	call	set_date
  1381 0000707C C3                  <1> 	retn
  1382                              <1> 
  1383                              <1> cmp_cmd_time:
  1384 0000707D B104                <1> 	mov	cl, 4
  1385 0000707F BF[A3F00000]        <1> 	mov	edi, Cmd_Time
  1386 00007084 E88B030000          <1>    	call	cmp_cmd	
  1387 00007089 720B                <1> 	jc	short cmp_cmd_show
  1388                              <1> 
  1389 0000708B E8C6FAFFFF          <1> 	call	show_time
  1390 00007090 E8F8FAFFFF          <1> 	call	set_time
  1391 00007095 C3                  <1> 	retn
  1392                              <1> 
  1393                              <1> cmp_cmd_show:
  1394 00007096 B104                <1> 	mov	cl, 4
  1395 00007098 BF[B4F00000]        <1> 	mov	edi, Cmd_Show
  1396 0000709D E872030000          <1>    	call	cmp_cmd	
  1397 000070A2 0F83EF090000        <1>         jnc     show_file
  1398                              <1> 
  1399                              <1> cmp_cmd_echo:
  1400 000070A8 B104                <1> 	mov	cl, 4
  1401 000070AA BF[F0F00000]        <1> 	mov	edi, Cmd_Echo
  1402 000070AF E860030000          <1>    	call	cmp_cmd	
  1403 000070B4 721B                <1> 	jc	short cmp_cmd_copy
  1404                              <1> 
  1405                              <1> 	; 14/04/2016
  1406 000070B6 56                  <1> 	push	esi
  1407                              <1> cmd_echo_asciiz:
  1408 000070B7 46                  <1>         inc	esi
  1409 000070B8 8A06                <1> 	mov	al, [esi]
  1410 000070BA 3C20                <1> 	cmp	al, 20h
  1411 000070BC 73F9                <1> 	jnb	short cmd_echo_asciiz
  1412 000070BE C60600              <1> 	mov	byte [esi], 0                 
  1413 000070C1 5E                  <1> 	pop	esi  
  1414 000070C2 E8AAEBFFFF          <1> 	call	print_msg
  1415 000070C7 BE[E0020100]        <1> 	mov	esi, NextLine
  1416                              <1> 	;call	print_msg   
  1417                              <1> 	;retn
  1418 000070CC E9A0EBFFFF          <1> 	jmp	print_msg
  1419                              <1> 
  1420                              <1> cmp_cmd_copy:
  1421 000070D1 B104                <1> 	mov	cl, 4
  1422 000070D3 BF[D7F00000]        <1> 	mov	edi, Cmd_Copy
  1423 000070D8 E837030000          <1>    	call	cmp_cmd	
  1424 000070DD 0F8305180000        <1> 	jnc	copy_file
  1425                              <1> 
  1426                              <1> cmp_cmd_move:
  1427 000070E3 B104                <1> 	mov	cl, 4
  1428 000070E5 BF[DCF00000]        <1> 	mov	edi, Cmd_Move
  1429 000070EA E825030000          <1>    	call	cmp_cmd	
  1430 000070EF 0F8399160000        <1> 	jnc	move_file
  1431                              <1> 
  1432                              <1> cmp_cmd_path:
  1433 000070F5 B104                <1> 	mov	cl, 4
  1434 000070F7 BF[E1F00000]        <1> 	mov	edi, Cmd_Path
  1435 000070FC E813030000          <1>    	call	cmp_cmd	
  1436 00007101 0F83391A0000        <1> 	jnc	set_get_path
  1437                              <1> 
  1438                              <1> cmp_cmd_beep:
  1439 00007107 B104                <1> 	mov	cl, 4
  1440 00007109 BF[0EF10000]        <1> 	mov	edi, Cmd_Beep
  1441 0000710E E801030000          <1>    	call	cmp_cmd	
  1442 00007113 720B                <1> 	jc	short cmp_cmd_find
  1443                              <1> 	; 13/05/2016
  1444 00007115 8A3D[D6330100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  1445 0000711B E963ACFFFF          <1> 	jmp	beeper
  1446                              <1> 
  1447                              <1> cmp_cmd_find:
  1448 00007120 B104                <1> 	mov	cl, 4
  1449 00007122 BF[EBF00000]        <1> 	mov	edi, Cmd_Find
  1450 00007127 E8E8020000          <1>    	call	cmp_cmd	
  1451 0000712C 0F82C5020000        <1>         jc      cmp_cmd_external
  1452                              <1> 
  1453                              <1> 	;call	find_and_list_files
  1454 00007132 E9EA220000          <1> 	jmp	find_and_list_files
  1455                              <1> 	;retn
  1456                              <1> 
  1457                              <1> c_1:
  1458 00007137 AD                  <1> 	lodsd
  1459                              <1> cmp_cmd_help:
  1460 00007138 3C3F                <1> 	cmp	al, '?'
  1461 0000713A 751D                <1>         jne     short cmp_cmd_remark
  1462                              <1> 
  1463 0000713C BE[74F00000]        <1> 	mov	esi, Command_List
  1464                              <1> cmd_help_next_w:
  1465 00007141 E82BEBFFFF          <1> 	call	print_msg
  1466                              <1> 
  1467 00007146 803E20              <1> 	cmp	byte [esi], 20h ; 0
  1468 00007149 7232                <1> 	jb	short cmd_help_retn
  1469                              <1> 	
  1470 0000714B 56                  <1> 	push	esi
  1471 0000714C BE[97020100]        <1> 	mov	esi, nextline
  1472 00007151 E81BEBFFFF          <1> 	call	print_msg
  1473 00007156 5E                  <1> 	pop	esi
  1474 00007157 EBE8                <1> 	jmp	short cmd_help_next_w	
  1475                              <1> 
  1476                              <1> cmp_cmd_remark:
  1477 00007159 3C2A                <1> 	cmp	al, '*'
  1478 0000715B 0F8596020000        <1>         jne     cmp_cmd_external
  1479 00007161 46                  <1> 	inc	esi
  1480 00007162 BF[D0340100]        <1> 	mov	edi, Remark
  1481 00007167 8A06                <1> 	mov	al, [esi]
  1482 00007169 3C20                <1> 	cmp	al, 20h
  1483 0000716B 7707                <1> 	ja	short cmd_remark_write
  1484 0000716D 89FE                <1> 	mov	esi, edi ; Remark
  1485 0000716F E9FDEAFFFF          <1> 	jmp	print_msg
  1486                              <1> 
  1487                              <1> cmd_remark_write:
  1488 00007174 AA                  <1> 	stosb
  1489 00007175 AC                  <1> 	lodsb
  1490 00007176 3C20                <1> 	cmp	al, 20h
  1491 00007178 73FA                <1> 	jnb	short cmd_remark_write
  1492 0000717A C60700              <1> 	mov	byte [edi], 0
  1493                              <1> 
  1494                              <1> cmd_help_retn:
  1495                              <1> cmd_remark_retn:
  1496                              <1> cd_retn:
  1497 0000717D C3                  <1> 	retn
  1498                              <1> 
  1499                              <1> c_2:
  1500 0000717E 80F902              <1> 	cmp	cl, 2
  1501 00007181 0F87B1000000        <1>         ja      c_3
  1502 00007187 BE[1E350100]        <1> 	mov	esi, CommandBuffer
  1503 0000718C 72A9                <1> 	jb	short c_1
  1504                              <1> 
  1505                              <1> cmp_cmd_cd:
  1506 0000718E 66AD                <1> 	lodsw
  1507 00007190 663D4344            <1> 	cmp	ax, 'CD'
  1508 00007194 7553                <1> 	jne	short cmp_cmd_drive
  1509 00007196 46                  <1>         inc	esi
  1510                              <1> cd_0:
  1511 00007197 668B06              <1> 	mov	ax, [esi]	
  1512 0000719A 3C20                <1> 	cmp	al, 20h
  1513 0000719C 76DF                <1> 	jna	short cd_retn
  1514                              <1> 	; 10/02/2016
  1515 0000719E 80FC3A              <1> 	cmp	ah, ':'
  1516 000071A1 7504                <1> 	jne	short cd_1
  1517 000071A3 46                  <1> 	inc	esi
  1518 000071A4 46                  <1> 	inc	esi
  1519 000071A5 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 000071A7 B4CD                <1> 	mov	ah, 0CDh ; mov byte [CD_COMMAND], 0CDh 
  1529                              <1> 
  1530 000071A9 E858230000          <1> 	call	change_current_directory
  1531 000071AE 0F8372220000        <1>         jnc     change_prompt_dir_string
  1532                              <1> 
  1533                              <1> cd_error_messages:
  1534 000071B4 3C03                <1> 	cmp	al, 3
  1535 000071B6 740C                <1> 	je	short cd_path_not_found
  1536                              <1> 	; 16/10/2016 (15h -> 15)
  1537 000071B8 3C0F                <1> 	cmp	al, 15 ; drive not ready error 
  1538 000071BA 745B                <1> 	je	short cd_drive_not_ready
  1539 000071BC 3C11                <1> 	cmp	al, 17 ; read error
  1540 000071BE 7457                <1> 	je	short cd_drive_not_ready	
  1541 000071C0 3C13                <1> 	cmp	al, 19 ; ; Bad directory/path name 
  1542 000071C2 7468                <1> 	je	short cd_command_failed
  1543                              <1> 
  1544                              <1> cd_path_not_found:
  1545 000071C4 6650                <1> 	push	ax	
  1546 000071C6 BE[17F30000]        <1> 	mov	esi, Msg_Dir_Not_Found
  1547 000071CB E8A1EAFFFF          <1> 	call	print_msg
  1548 000071D0 6658                <1> 	pop	ax
  1549 000071D2 3A25[6C340100]      <1> 	cmp	ah, [Current_Dir_Level]
  1550 000071D8 0F8348220000        <1>         jnb     change_prompt_dir_string
  1551 000071DE 8825[6C340100]      <1> 	mov	[Current_Dir_Level], ah
  1552 000071E4 E93D220000          <1>         jmp     change_prompt_dir_string   
  1553                              <1> 
  1554                              <1> cmp_cmd_drive: ; change current drive
  1555                              <1> 	; C:, D:, E: etc.
  1556 000071E9 80FC3A              <1> 	cmp	ah, ':'
  1557 000071EC 0F8505020000        <1>         jne     cmp_cmd_external
  1558                              <1> 
  1559                              <1> cd_2:	; 'CD C:', 'CD D:' ...
  1560 000071F2 803E20              <1> 	cmp	byte [esi], 20h
  1561 000071F5 0F8706020000        <1>         ja      loc_cmd_failed
  1562                              <1> 
  1563 000071FB 24DF                <1> 	and	al, 0DFh
  1564 000071FD 2C41                <1> 	sub	al, 'A'
  1565 000071FF 0F82FC010000        <1>         jc      loc_cmd_failed
  1566                              <1> 
  1567 00007205 3A05[14F00000]      <1>         cmp     al, [Last_DOS_DiskNo]
  1568 0000720B 770A                <1>         ja	short cd_drive_not_ready
  1569                              <1> 	
  1570 0000720D 88C2                <1> 	mov	dl, al
  1571 0000720F E85DF3FFFF          <1> 	call 	change_current_drive
  1572 00007214 7201                <1> 	jc	short cd_drive_not_ready	
  1573 00007216 C3                  <1> 	retn
  1574                              <1> 
  1575                              <1> cd_drive_not_ready:
  1576 00007217 BE[D4F20000]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1577 0000721C E850EAFFFF          <1> 	call	print_msg
  1578                              <1> 
  1579                              <1> cd_fail_drive_restart:
  1580 00007221 8A15[6E340100]      <1> 	mov	dl, [Current_Drv]
  1581                              <1> 	;call 	change_current_drive
  1582 00007227 E945F3FFFF          <1>         jmp     change_current_drive
  1583                              <1> 	;retn
  1584                              <1> 
  1585                              <1> cd_command_failed:
  1586 0000722C BE[B5F20000]        <1> 	mov	esi, Msg_Bad_Command
  1587 00007231 E83BEAFFFF          <1> 	call	print_msg
  1588 00007236 EBE9                <1> 	jmp	short cd_fail_drive_restart
  1589                              <1> 
  1590                              <1> c_3:
  1591                              <1> cmp_cmd_dir:
  1592 00007238 BF[74F00000]        <1> 	mov	edi, Cmd_Dir
  1593 0000723D E8D2010000          <1> 	call	cmp_cmd	
  1594 00007242 0F8371020000        <1> 	jnc	print_directory_list
  1595                              <1> 
  1596                              <1> cmp_cmd_cls:
  1597 00007248 B103                <1> 	mov	cl, 3
  1598 0000724A BF[B0F00000]        <1> 	mov	edi, Cmd_Cls
  1599 0000724F E8C0010000          <1> 	call	cmp_cmd	
  1600 00007254 0F832DEAFFFF        <1>         jnc	clear_screen
  1601                              <1> 
  1602                              <1> cmp_cmd_ver:
  1603 0000725A B103                <1> 	mov	cl, 3
  1604 0000725C BF[7EF00000]        <1> 	mov	edi, Cmd_Ver
  1605 00007261 E8AE010000          <1> 	call	cmp_cmd	
  1606 00007266 720A                <1> 	jc	short cmp_cmd_mem
  1607                              <1> 
  1608 00007268 BE[1CF00000]        <1> 	mov	esi, mainprog_Version
  1609                              <1> 	;call	print_msg
  1610 0000726D E9FFE9FFFF          <1> 	jmp	print_msg
  1611                              <1> 	;retn
  1612                              <1> 
  1613                              <1> cmp_cmd_mem:
  1614 00007272 B103                <1> 	mov	cl, 3
  1615 00007274 BF[E6F00000]        <1> 	mov	edi, Cmd_Mem
  1616 00007279 E896010000          <1> 	call	cmp_cmd	
  1617 0000727E 0F83C1BFFFFF        <1> 	jnc	memory_info
  1618                              <1> 
  1619                              <1> cmp_cmd_del:
  1620 00007284 B103                <1> 	mov	cl, 3
  1621 00007286 BF[B9F00000]        <1> 	mov	edi, Cmd_Del
  1622 0000728B E884010000          <1> 	call	cmp_cmd	
  1623 00007290 0F832D0F0000        <1>         jnc     delete_file
  1624                              <1> 
  1625                              <1> cmp_cmd_set:
  1626 00007296 B103                <1> 	mov	cl, 3
  1627 00007298 BF[ACF00000]        <1> 	mov	edi, Cmd_Set
  1628 0000729D E872010000          <1> 	call	cmp_cmd	
  1629 000072A2 0F8310180000        <1>         jnc     set_get_env
  1630                              <1> 
  1631                              <1> cmp_cmd_run:
  1632 000072A8 B103                <1> 	mov	cl, 3
  1633 000072AA BF[A8F00000]        <1> 	mov	edi, Cmd_Run
  1634 000072AF E860010000          <1> 	call	cmp_cmd	
  1635                              <1> 	; 07/05/2016
  1636 000072B4 0F823D010000        <1>         jc      cmp_cmd_external
  1637 000072BA E9471E0000          <1> 	jmp	load_and_execute_file
  1638                              <1> c_5:
  1639                              <1> cmp_cmd_mkdir:
  1640 000072BF BF[D1F00000]        <1> 	mov	edi, Cmd_Mkdir
  1641 000072C4 E84B010000          <1> 	call	cmp_cmd	
  1642 000072C9 0F838C0A0000        <1>         jnc     make_directory
  1643                              <1> 
  1644                              <1> cmp_cmd_rmdir:
  1645 000072CF B105                <1> 	mov	cl, 5
  1646 000072D1 BF[CBF00000]        <1> 	mov	edi, Cmd_Rmdir
  1647 000072D6 E839010000          <1> 	call	cmp_cmd	
  1648 000072DB 0F83990B0000        <1>         jnc     delete_directory
  1649                              <1> 
  1650                              <1> cmp_cmd_chdir:
  1651 000072E1 B105                <1> 	mov	cl, 5
  1652 000072E3 BF[08F10000]        <1> 	mov	edi, Cmd_Chdir
  1653 000072E8 E827010000          <1> 	call	cmp_cmd	
  1654 000072ED 0F8204010000        <1>         jc      cmp_cmd_external
  1655                              <1> 
  1656 000072F3 E99FFEFFFF          <1> 	jmp	cd_0
  1657                              <1> 
  1658                              <1> c_6:
  1659 000072F8 80F906              <1> 	cmp	cl, 6
  1660 000072FB 0F87DF000000        <1>         ja      c_8
  1661 00007301 72BC                <1> 	jb	short c_5
  1662                              <1> cmp_cmd_prompt:
  1663 00007303 BF[87F00000]        <1> 	mov	edi, Cmd_Prompt
  1664 00007308 E807010000          <1> 	call	cmp_cmd	
  1665 0000730D 722E                <1>         jc	short cmp_cmd_volume
  1666                              <1> get_prompt_name_fchar:
  1667 0000730F AC                  <1> 	lodsb
  1668 00007310 3C20                <1> 	cmp	al, 20h
  1669 00007312 74FB                <1> 	je	short get_prompt_name_fchar
  1670 00007314 7712                <1> 	ja	short loc_change_prompt_label
  1671 00007316 BE[68F00000]        <1> 	mov	esi, TRDOSPromptLabel
  1672 0000731B C7065452444F        <1> 	mov	dword [esi], "TRDO"
  1673 00007321 66C746045300        <1>        	mov	word [esi+4], "S" 
  1674                              <1> loc_cmd_prompt_return:
  1675 00007327 C3                  <1> 	retn
  1676                              <1> loc_change_prompt_label:
  1677 00007328 66B90B00            <1> 	mov	cx, 11
  1678 0000732C BF[68F00000]        <1> 	mov	edi, TRDOSPromptLabel
  1679                              <1> put_char_new_prompt_label:
  1680 00007331 AA                  <1> 	stosb
  1681 00007332 AC                  <1> 	lodsb
  1682 00007333 3C20                <1> 	cmp	al, 20h
  1683 00007335 7202                <1> 	jb	short pass_put_new_prompt_label
  1684 00007337 E2F8                <1> 	loop	put_char_new_prompt_label
  1685                              <1> pass_put_new_prompt_label:
  1686 00007339 C60700              <1> 	mov	byte [edi], 0
  1687 0000733C C3                  <1> 	retn
  1688                              <1> 
  1689                              <1> cmp_cmd_volume:
  1690 0000733D B106                <1> 	mov	cl, 6
  1691 0000733F BF[8EF00000]        <1> 	mov	edi, Cmd_Volume
  1692 00007344 E8CB000000          <1> 	call	cmp_cmd	
  1693 00007349 7255                <1>         jc	short cmp_cmd_attrib
  1694                              <1> 
  1695                              <1> cmd_vol1:
  1696 0000734B AC                  <1> 	lodsb
  1697 0000734C 3C20                <1> 	cmp	al, 20h
  1698 0000734E 7707                <1> 	ja	short cmd_vol2
  1699 00007350 A0[6E340100]        <1> 	mov	al, [Current_Drv]
  1700 00007355 EB3D                <1> 	jmp	short cmd_vol4
  1701                              <1> cmd_vol2:
  1702 00007357 3C41                <1> 	cmp	al, 'A'
  1703 00007359 0F82A2000000        <1>         jb      loc_cmd_failed
  1704 0000735F 3C7A                <1> 	cmp	al, 'z'
  1705 00007361 0F879A000000        <1>         ja      loc_cmd_failed
  1706 00007367 3C5A                <1> 	cmp	al, 'Z'
  1707 00007369 760A                <1> 	jna	short cmd_vol3
  1708 0000736B 3C61                <1> 	cmp	al, 'a'
  1709 0000736D 0F828E000000        <1>         jb      loc_cmd_failed
  1710 00007373 24DF                <1> 	and	al, 0DFh
  1711                              <1> cmd_vol3:
  1712 00007375 8A26                <1> 	mov	ah, [esi]
  1713 00007377 80FC3A              <1> 	cmp	ah, ':'
  1714 0000737A 0F8581000000        <1>         jne     loc_cmd_failed
  1715 00007380 2C41                <1> 	sub	al, 'A'
  1716 00007382 3A05[14F00000]      <1>         cmp     al, [Last_DOS_DiskNo]
  1717 00007388 760A                <1> 	jna	short cmd_vol4
  1718                              <1> 
  1719 0000738A BE[D4F20000]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1720 0000738F E9DDE8FFFF          <1> 	jmp	print_msg
  1721                              <1> 	
  1722                              <1> cmd_vol4:
  1723 00007394 E896FAFFFF          <1> 	call	print_volume_info
  1724 00007399 0F8278FEFFFF        <1>         jc      cd_drive_not_ready
  1725 0000739F C3                  <1> 	retn
  1726                              <1> 
  1727                              <1> cmp_cmd_attrib:
  1728 000073A0 B106                <1> 	mov	cl, 6
  1729 000073A2 BF[BDF00000]        <1> 	mov	edi, Cmd_Attrib
  1730 000073A7 E868000000          <1> 	call	cmp_cmd	
  1731 000073AC 0F83310F0000        <1>         jnc     set_file_attributes
  1732                              <1> 
  1733                              <1> cmp_cmd_rename:
  1734 000073B2 B106                <1> 	mov	cl, 6
  1735 000073B4 BF[C4F00000]        <1> 	mov	edi, Cmd_Rename
  1736 000073B9 E856000000          <1> 	call	cmp_cmd	
  1737 000073BE 0F8367110000        <1>         jnc     rename_file
  1738                              <1> 
  1739                              <1> cmp_cmd_device:
  1740 000073C4 B106                <1> 	mov	cl, 6
  1741 000073C6 BF[F9F00000]        <1> 	mov	edi, Cmd_Device
  1742 000073CB E844000000          <1> 	call	cmp_cmd	
  1743 000073D0 7225                <1>         jc	short cmp_cmd_external
  1744                              <1> 
  1745 000073D2 C3                  <1> 	retn
  1746                              <1> 
  1747                              <1> c_7:
  1748                              <1> cmp_cmd_devlist:
  1749 000073D3 BF[00F10000]        <1> 	mov	edi, Cmd_DevList
  1750 000073D8 E837000000          <1> 	call	cmp_cmd	
  1751 000073DD 7218                <1>         jc	short cmp_cmd_external
  1752                              <1> 
  1753                              <1> loc_cmd_return:
  1754 000073DF C3                  <1> 	retn
  1755                              <1> 
  1756                              <1> c_8:
  1757 000073E0 80F908              <1>         cmp	cl, 8
  1758 000073E3 7712                <1> 	ja	short cmp_cmd_external
  1759 000073E5 72EC                <1> 	jb	short c_7
  1760                              <1> 
  1761                              <1> cmp_cmd_longname:
  1762 000073E7 BF[95F00000]        <1> 	mov	edi, Cmd_LongName
  1763 000073EC E823000000          <1> 	call	cmp_cmd	
  1764 000073F1 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 000073F7 BE[1E350100]        <1> 	mov	esi, CommandBuffer
  1770 000073FC E9051D0000          <1> 	jmp	loc_run_check_filename 
  1771                              <1> 
  1772                              <1> loc_cmd_failed:
  1773 00007401 803D[1E350100]20    <1> 	cmp	byte [CommandBuffer], 20h
  1774 00007408 76D5                <1> 	jna	short loc_cmd_return
  1775 0000740A BE[B5F20000]        <1> 	mov	esi, Msg_Bad_Command
  1776                              <1> ;	call	print_msg
  1777                              <1> ;loc_cmd_return:
  1778                              <1> ;	retn
  1779 0000740F E95DE8FFFF          <1> 	jmp	print_msg
  1780                              <1> 
  1781                              <1> cmp_cmd:
  1782                              <1> 	 ; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
  1783 00007414 BE[1E350100]        <1>          mov	esi, CommandBuffer
  1784                              <1>          ; edi = internal command word (ASCIIZ)
  1785                              <1> 	 ; ecx = command length (<=8)
  1786                              <1> cmp_cmd_1:
  1787 00007419 AC                  <1> 	lodsb
  1788 0000741A AE                  <1> 	scasb
  1789 0000741B 750D                <1> 	jne	short cmp_cmd_3
  1790 0000741D E2FA                <1> 	loop	cmp_cmd_1
  1791 0000741F AC                  <1>  	lodsb
  1792 00007420 3C20                <1> 	cmp	al, 20h
  1793 00007422 7703                <1> 	ja	short cmp_cmd_2
  1794 00007424 30C0                <1> 	xor	al, al
  1795                              <1> 	; ZF = 1 -> internal command word matches
  1796 00007426 C3                  <1> 	retn
  1797                              <1> cmp_cmd_2:
  1798                              <1> 	; ZF = 0 (CF = 0) -> external command word 	
  1799 00007427 58                  <1> 	pop	eax ; no return to the caller from here 
  1800 00007428 EBCD                <1> 	jmp	cmp_cmd_external	
  1801                              <1> cmp_cmd_3:
  1802 0000742A F9                  <1> 	stc
  1803                              <1> 	; CF = 1 -> internal command word does not match
  1804 0000742B 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 0000742C 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 00007431 3C01                <1> 	cmp	al, 1 ; Bad command or file name
  1818 00007433 74CC                <1> 	je	loc_cmd_failed
  1819                              <1> loc_run_dir_not_found:
  1820 00007435 3C03                <1> 	cmp	al, 3
  1821 00007437 750A                <1> 	jne	short loc_run_file_notfound_msg
  1822                              <1> 	; Path not found (MS-DOS Error Code = 3)
  1823 00007439 BE[17F30000]        <1> 	mov	esi, Msg_Dir_Not_Found
  1824 0000743E E92EE8FFFF          <1> 	jmp	print_msg
  1825                              <1> 
  1826                              <1> loc_run_file_notfound_msg:
  1827 00007443 3C02                <1> 	cmp	al, 2 ; File not found
  1828 00007445 750A                <1> 	jne	short loc_run_file_drv_read_err
  1829                              <1> 
  1830                              <1> loc_print_file_notfound_msg: 
  1831 00007447 BE[2EF30000]        <1>         mov     esi, Msg_File_Not_Found
  1832                              <1> 	;call	proc_printmsg
  1833                              <1> 	;retn
  1834 0000744C E920E8FFFF          <1> 	jmp	print_msg
  1835                              <1> 
  1836                              <1> loc_run_file_drv_read_err:
  1837                              <1> 	; Err: 17 (Read fault)
  1838 00007451 3C11                <1> 	cmp	al, 17 ; Drive not ready or read error
  1839 00007453 7404                <1> 	je	short loc_run_file_print_drv_read_err
  1840                              <1> 	;
  1841 00007455 3C0F                <1> 	cmp	al, 15 ; Drive not ready (or read error)
  1842 00007457 750A                <1> 	jne	short loc_run_file_toobig
  1843                              <1> 
  1844                              <1> loc_run_file_print_drv_read_err:
  1845 00007459 BE[D4F20000]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1846 0000745E E90EE8FFFF          <1> 	jmp	print_msg
  1847                              <1> 
  1848                              <1> loc_run_file_toobig:
  1849 00007463 3C08                <1> 	cmp	al, 8 ; Not enough free memory to load&run file
  1850 00007465 750A                <1> 	jne	short loc_run_misc_error
  1851 00007467 BE[79F30000]        <1> 	mov	esi, Msg_Insufficient_Memory
  1852 0000746C 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 00007471 E844BEFFFF          <1> 	call	bytetohex
  1859 00007476 66A3[ADF30000]      <1>         mov     [error_code_hex], ax
  1860                              <1> 	
  1861 0000747C BE[90F30000]        <1> 	mov	esi, Msg_Error_Code 
  1862                              <1> 	;call	print_msg 
  1863                              <1> 	;retn
  1864                              <1> 
  1865 00007481 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 00007486 50                  <1> 	push	eax
  1870 00007487 8A3D[CE3C0100]      <1> 	mov	bh, [RUN_CDRV] ; it is set at the beginning
  1871                              <1> 				; of the 'run' command.
  1872 0000748D 3A3D[6E340100]      <1> 	cmp	bh, [Current_Drv]
  1873 00007493 7409                <1> 	je	short loc_run_restore_cdir
  1874 00007495 88FA                <1> 	mov	dl, bh
  1875 00007497 E8D5F0FFFF          <1> 	call	change_current_drive 
  1876 0000749C EB19                <1> 	jmp	short loc_run_err_pass_restore_cdir
  1877                              <1> 
  1878                              <1> loc_run_restore_cdir:
  1879 0000749E 803D[15F00000]00    <1> 	cmp	byte [Restore_CDIR], 0
  1880 000074A5 7610                <1> 	jna	short loc_run_err_pass_restore_cdir
  1881 000074A7 30DB                <1> 	xor	bl, bl
  1882 000074A9 0FB7F3              <1> 	movzx	esi, bx
  1883 000074AC 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1884 000074B2 E871F1FFFF          <1> 	call	restore_current_directory
  1885                              <1> 
  1886                              <1> loc_run_err_pass_restore_cdir:
  1887 000074B7 58                  <1> 	pop	eax
  1888 000074B8 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 000074B9 66C705[103E0100]00- <1> 	mov	word [AttributesMask], 0800h ; ..except volume names..
  1895 000074C1 08                  <1>
  1896 000074C2 A0[6E340100]        <1> 	mov	al, [Current_Drv]
  1897 000074C7 A2[CE3C0100]        <1> 	mov	[RUN_CDRV], al
  1898                              <1> get_dfname_fchar:
  1899 000074CC AC                  <1> 	lodsb
  1900 000074CD 3C20                <1> 	cmp	al, 20h
  1901 000074CF 74FB                <1> 	je	short get_dfname_fchar
  1902 000074D1 0F82A4000000        <1>         jb      loc_print_dir_call_all
  1903 000074D7 3C2D                <1> 	cmp	al, '-'
  1904 000074D9 7542                <1> 	jne	short loc_print_dir_call_flt
  1905                              <1> get_next_attr_char:
  1906 000074DB AC                  <1> 	lodsb
  1907 000074DC 3C20                <1> 	cmp	al, 20h
  1908 000074DE 74FB                <1> 	je	short get_next_attr_char
  1909 000074E0 0F821BFFFFFF        <1>         jb      loc_cmd_failed
  1910 000074E6 24DF                <1> 	and	al, 0DFh
  1911 000074E8 3C44                <1> 	cmp	al, 'D' ; directories only ?
  1912 000074EA 7512                <1> 	jne	short pass_only_directories
  1913 000074EC AC                  <1> 	lodsb
  1914 000074ED 3C20                <1> 	cmp	al, 20h
  1915 000074EF 0F870CFFFFFF        <1>         ja      loc_cmd_failed
  1916 000074F5 800D[103E0100]10    <1> 	or	byte [AttributesMask], 10h ; ..directory..
  1917 000074FC EB18                <1> 	jmp	short get_dfname_fchar_attr
  1918                              <1> pass_only_directories:
  1919 000074FE 3C46                <1> 	cmp	al, 'F'	; files only ?
  1920 00007500 0F85B0000000        <1>         jne     check_attr_s
  1921 00007506 AC                  <1> 	lodsb
  1922 00007507 3C20                <1> 	cmp	al, 20h
  1923 00007509 0F87F2FEFFFF        <1>         ja      loc_cmd_failed
  1924 0000750F 800D[113E0100]10    <1> 	or	byte [AttributesMask+1], 10h ; ..except directories..
  1925                              <1> get_dfname_fchar_attr:
  1926 00007516 AC                  <1> 	lodsb
  1927 00007517 3C20                <1> 	cmp	al, 20h
  1928 00007519 74FB                <1> 	je	short get_dfname_fchar_attr
  1929 0000751B 725E                <1> 	jb	short loc_print_dir_call_all
  1930                              <1> 
  1931                              <1> loc_print_dir_call_flt:
  1932 0000751D 4E                  <1> 	dec	esi
  1933 0000751E BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  1934 00007523 E8F2250000          <1> 	call	parse_path_name
  1935 00007528 7308                <1>  	jnc	short loc_print_dir_change_drv_1
  1936 0000752A 3C01                <1> 	cmp	al, 1
  1937 0000752C 0F87FAFEFFFF        <1>         ja      loc_run_cmd_failed
  1938                              <1> 
  1939                              <1> loc_print_dir_change_drv_1:
  1940 00007532 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  1941                              <1> loc_print_dir_change_drv_2:
  1942 00007538 3A15[CE3C0100]      <1> 	cmp	dl, [RUN_CDRV]
  1943 0000753E 740B                <1> 	je	short loc_print_dir_change_directory 
  1944 00007540 E82CF0FFFF          <1> 	call	change_current_drive
  1945 00007545 0F82E1FEFFFF        <1>         jc      loc_run_cmd_failed
  1946                              <1> loc_print_dir_change_directory:
  1947 0000754B 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h ; 0 or 20h ?
  1948 00007552 761D                <1> 	jna	short pass_print_dir_change_directory
  1949                              <1> 
  1950 00007554 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  1951 0000755A BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  1952 0000755F 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  1953 00007561 E8A01F0000          <1> 	call	change_current_directory
  1954 00007566 0F82C0FEFFFF        <1>         jc      loc_run_cmd_failed
  1955                              <1> 
  1956                              <1> loc_print_dir_change_prompt_dir_string:
  1957 0000756C E8B51E0000          <1> 	call	change_prompt_dir_string
  1958                              <1> 
  1959                              <1> pass_print_dir_change_directory:
  1960 00007571 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  1961 00007576 803E20              <1> 	cmp	byte [esi], 20h ; ; 0 or 20h ?
  1962 00007579 7706                <1> 	ja	short loc_print_dir_call
  1963                              <1> 
  1964                              <1> loc_print_dir_call_all:
  1965 0000757B C7062A2E2A00        <1> 	mov	dword [esi], '*.*'
  1966                              <1> loc_print_dir_call:
  1967 00007581 E87E000000          <1> 	call	print_directory
  1968                              <1> 
  1969 00007586 8A15[CE3C0100]      <1> 	mov	dl, [RUN_CDRV]  ; it is set at the beginning
  1970 0000758C 3A15[6E340100]      <1> 	cmp	dl, [Current_Drv]
  1971 00007592 7406                <1> 	je	short loc_print_dir_call_restore_cdir_retn
  1972 00007594 E8D8EFFFFF          <1> 	call	change_current_drive 
  1973 00007599 C3                  <1> 	retn
  1974                              <1> 
  1975                              <1> loc_print_dir_call_restore_cdir_retn:
  1976 0000759A 803D[15F00000]00    <1> 	cmp	byte [Restore_CDIR], 0
  1977 000075A1 7610                <1> 	jna	short pass_print_dir_call_restore_cdir_retn
  1978                              <1> 
  1979 000075A3 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1980 000075A8 31C0                <1> 	xor	eax, eax
  1981 000075AA 88D4                <1> 	mov	ah, dl
  1982 000075AC 01C6                <1> 	add	esi, eax
  1983                              <1> 
  1984 000075AE E875F0FFFF          <1> 	call	restore_current_directory
  1985                              <1> 
  1986                              <1> pass_print_dir_call_restore_cdir_retn:
  1987 000075B3 C3                  <1> 	retn
  1988                              <1> 
  1989                              <1> check_attr_s_cap:
  1990 000075B4 24DF                <1> 	and	al, 0DFh
  1991                              <1> check_attr_s:
  1992 000075B6 3C53                <1> 	cmp	al, 'S'
  1993 000075B8 7514                <1> 	jne	short pass_attr_s
  1994 000075BA 800D[103E0100]04    <1> 	or	byte [AttributesMask], 4 ; system
  1995 000075C1 AC                  <1> 	lodsb
  1996 000075C2 3C20                <1> 	cmp	al, 20h
  1997 000075C4 0F844CFFFFFF        <1>         je      get_dfname_fchar_attr
  1998 000075CA 72AF                <1> 	jb	short loc_print_dir_call_all
  1999 000075CC 24DF                <1> 	and	al, 0DFh
  2000                              <1> pass_attr_s:
  2001 000075CE 3C48                <1> 	cmp	al, 'H'
  2002 000075D0 7514                <1> 	jne	short pass_attr_h
  2003 000075D2 800D[103E0100]02    <1> 	or	byte [AttributesMask], 2 ; hidden
  2004                              <1> pass_attr_shr:
  2005 000075D9 AC                  <1> 	lodsb
  2006 000075DA 3C20                <1> 	cmp	al, 20h
  2007 000075DC 0F8434FFFFFF        <1>         je      get_dfname_fchar_attr
  2008 000075E2 7297                <1> 	jb	short loc_print_dir_call_all
  2009 000075E4 EBCE                <1> 	jmp	short check_attr_s_cap
  2010                              <1> 
  2011                              <1> pass_attr_h:
  2012 000075E6 3C52                <1> 	cmp	al, 'R'
  2013 000075E8 7509                <1> 	jne	short pass_attr_r
  2014 000075EA 800D[103E0100]01    <1> 	or	byte [AttributesMask], 1 ; read only
  2015 000075F1 EBE6                <1> 	jmp	short pass_attr_shr
  2016                              <1> 
  2017                              <1> pass_attr_r:
  2018 000075F3 3C41                <1> 	cmp	al, 'A'
  2019 000075F5 0F8506FEFFFF        <1>         jne     loc_cmd_failed
  2020 000075FB 800D[103E0100]20    <1> 	or	byte [AttributesMask], 20h ; archive
  2021 00007602 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 00007604 56                  <1> 	push	esi
  2035                              <1> 
  2036 00007605 29C0                <1> 	sub	eax, eax
  2037                              <1> 
  2038 00007607 66A3[9C3E0100]      <1> 	mov	word [Dir_Count], ax ; 0
  2039 0000760D 66A3[9A3E0100]      <1> 	mov 	word [File_Count], ax ; 0
  2040 00007613 A3[9E3E0100]        <1> 	mov 	dword [Total_FSize], eax ; 0
  2041                              <1> 
  2042 00007618 E86AE6FFFF          <1> 	call    clear_screen
  2043                              <1> 	
  2044 0000761D 31C9                <1> 	xor	ecx, ecx	
  2045 0000761F 8A2D[6E340100]      <1> 	mov     ch, [Current_Drv] ; DirBuff_Drv - 'A'
  2046 00007625 A0[6F340100]        <1> 	mov     al, [Current_Dir_Drv] 
  2047 0000762A A2[D2F10000]        <1> 	mov     [Dir_Drive_Name], al
  2048 0000762F BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2049 00007634 01CE                <1> 	add	esi, ecx
  2050                              <1> 
  2051 00007636 E86EF9FFFF          <1> 	call	move_volume_name_and_serial_no
  2052 0000763B 730C                <1> 	jnc	short print_dir_strlen_check
  2053                              <1> 
  2054 0000763D 5E                  <1> 	pop	esi
  2055 0000763E 8A3D[D6330100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  2056                              <1> 	;call	beeper
  2057                              <1> 	;retn
  2058 00007644 E93AA7FFFF          <1> 	jmp	beeper  ; beep ! and return
  2059                              <1> 
  2060                              <1> print_dir_strlen_check:
  2061 00007649 BE[71340100]        <1> 	mov	esi, Current_Dir_Root
  2062 0000764E BF[6FF20000]        <1> 	mov	edi, Dir_Str_Root
  2063                              <1> 	
  2064                              <1> 	;xor	ecx, ecx
  2065 00007653 8A0D[CD340100]      <1>         mov     cl, [Current_Dir_StrLen]
  2066 00007659 FEC1                <1> 	inc	cl
  2067 0000765B 80F940              <1> 	cmp	cl, 64
  2068 0000765E 760D                <1> 	jna	short pass_print_dir_strlen_shorting
  2069 00007660 46                  <1> 	inc	esi
  2070 00007661 01CE                <1> 	add	esi, ecx
  2071 00007663 83EE40              <1> 	sub	esi, 64 
  2072 00007666 47                  <1> 	inc	edi
  2073 00007667 B82E2E2E20          <1> 	mov	eax, '... ' 
  2074 0000766C AB                  <1> 	stosd
  2075                              <1>  
  2076                              <1> pass_print_dir_strlen_shorting:
  2077 0000766D F3A4                <1> 	rep	movsb
  2078                              <1> 
  2079 0000766F BE[C5F10000]        <1> 	mov	esi, Dir_Drive_Str
  2080 00007674 E8F8E5FFFF          <1> 	call	print_msg
  2081                              <1> 
  2082 00007679 BE[24F20000]        <1> 	mov	esi, Vol_Serial_Header
  2083 0000767E E8EEE5FFFF          <1> 	call	print_msg
  2084                              <1> 
  2085 00007683 BE[64F20000]        <1> 	mov	esi, Dir_Str_Header
  2086 00007688 E8E4E5FFFF          <1> 	call	print_msg
  2087                              <1> 	
  2088 0000768D BE[95020100]        <1> 	mov	esi, next2line
  2089 00007692 E8DAE5FFFF          <1> 	call	print_msg
  2090                              <1> 
  2091                              <1> loc_print_dir_first_file:
  2092 00007697 C605[B13E0100]10    <1> 	mov	byte [PrintDir_RowCounter], 16
  2093 0000769E 66A1[103E0100]      <1> 	mov	ax, [AttributesMask]
  2094 000076A4 5E                  <1> 	pop	esi
  2095                              <1> 
  2096 000076A5 E859020000          <1> 	call	find_first_file
  2097 000076AA 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 000076B0 F6C310              <1> 	test	bl, 10h  ; Is it a directory?
  2102 000076B3 741B                <1> 	jz	short loc_not_dir
  2103                              <1> 
  2104 000076B5 66FF05[9C3E0100]    <1> 	inc	word [Dir_Count]
  2105 000076BC 89F2                <1> 	mov	edx, esi 	; FindFile_DirEntry address
  2106 000076BE BE[B4F30000]        <1>  	mov	esi, Type_Dir	; '<DIR>     '
  2107 000076C3 BF[CBF30000]        <1> 	mov	edi, Dir_Or_FileSize
  2108                              <1> 	; move 10 bytes
  2109 000076C8 A5                  <1> 	movsd
  2110 000076C9 A5                  <1> 	movsd
  2111 000076CA 66A5                <1> 	movsw	    	
  2112 000076CC 89D6                <1> 	mov	esi, edx
  2113 000076CE EB36                <1> 	jmp     short loc_dir_attribute
  2114                              <1> 
  2115                              <1> loc_not_dir:
  2116 000076D0 66FF05[9A3E0100]    <1> 	inc	word [File_Count]
  2117 000076D7 0105[9E3E0100]      <1> 	add	[Total_FSize], eax
  2118                              <1> 
  2119 000076DD B90A000000          <1> 	mov	ecx, 10  ; 32 bit divisor
  2120 000076E2 89CF                <1> 	mov	edi, ecx
  2121 000076E4 81C7[CBF30000]      <1> 	add	edi, Dir_Or_FileSize
  2122                              <1> loc_dir_rdivide:
  2123 000076EA 29D2                <1> 	sub	edx, edx
  2124 000076EC F7F1                <1> 	div	ecx 	 ; remainder in dl (< 10)
  2125 000076EE 80C230              <1> 	add     dl, '0'	 ; to make visible (ascii)
  2126 000076F1 4F                  <1> 	dec	edi
  2127 000076F2 8817                <1> 	mov     [edi], dl
  2128 000076F4 21C0                <1> 	and	eax, eax
  2129 000076F6 75F2                <1> 	jnz	short loc_dir_rdivide
  2130                              <1> 
  2131                              <1> loc_dir_fill_space:
  2132 000076F8 81FF[CBF30000]      <1> 	cmp     edi, Dir_Or_FileSize
  2133 000076FE 7606                <1> 	jna     short loc_dir_attribute
  2134 00007700 4F                  <1> 	dec     edi
  2135 00007701 C60720              <1> 	mov     byte [edi], 20h
  2136 00007704 EBF2                <1> 	jmp     short loc_dir_fill_space
  2137                              <1> 
  2138                              <1> loc_dir_attribute:
  2139 00007706 C705[D6F30000]2020- <1> 	mov	dword [File_Attribute], 20202020h
  2139 0000770E 2020                <1>
  2140                              <1> 
  2141 00007710 80FB20              <1> 	cmp	bl, 20h  ; Is it an archive file?
  2142 00007713 7207                <1> 	jb	short loc_dir_pass_arch
  2143 00007715 C605[D9F30000]41    <1> 	mov	byte [File_Attribute+3], 'A'
  2144                              <1> 
  2145                              <1> loc_dir_pass_arch:
  2146 0000771C 80E307              <1> 	and	bl, 7
  2147 0000771F 7428                <1> 	jz	short loc_dir_file_name
  2148 00007721 88DF                <1> 	mov	bh, bl
  2149 00007723 80E303              <1> 	and	bl, 3
  2150 00007726 38DF                <1> 	cmp	bh, bl
  2151 00007728 7607                <1> 	jna	short loc_dir_pass_s
  2152 0000772A C605[D6F30000]53    <1> 	mov	byte [File_Attribute], 'S'
  2153                              <1> 
  2154                              <1> loc_dir_pass_s:
  2155 00007731 80E302              <1> 	and     bl,2
  2156 00007734 7407                <1> 	jz      short loc_dir_pass_h
  2157 00007736 C605[D7F30000]48    <1> 	mov     byte [File_Attribute+1], 'H'
  2158                              <1> loc_dir_pass_h:
  2159 0000773D 80E701              <1> 	and     bh,1
  2160 00007740 7407                <1> 	jz      short loc_dir_file_name
  2161 00007742 C605[D8F30000]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 00007749 8B5E16              <1> 	mov	ebx, [esi+16h]
  2166 0000774C 89F1                <1> 	mov	ecx, esi ; FindFile_DirEntry address
  2167 0000774E BF[BEF30000]        <1> 	mov     edi, File_Name
  2168                              <1> 	; move 8 bytes
  2169 00007753 A5                  <1> 	movsd
  2170 00007754 A5                  <1> 	movsd
  2171 00007755 C60720              <1> 	mov	byte [edi], 20h
  2172 00007758 47                  <1> 	inc	edi
  2173                              <1> 	; move 3 bytes
  2174 00007759 66A5                <1> 	movsw
  2175 0000775B A4                  <1> 	movsb
  2176 0000775C 89CE                <1> 	mov	esi, ecx
  2177                              <1> 
  2178                              <1> Dir_Time_start:
  2179                              <1> 	;mov	ax, dx		; Time
  2180 0000775E 6689D8              <1> 	mov	ax, bx
  2181 00007761 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2182 00007765 6683E03F            <1> 	and	ax, 0000111111b	; Minute Mask
  2183 00007769 D40A                <1> 	aam			; Q([AL]/10)->AH
  2184                              <1> 				; R([AL]/10)->AL
  2185                              <1> 				; [AL]+[AH]= Minute as BCD
  2186 0000776B 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2187 0000776F 86E0                <1> 	xchg	ah, al
  2188 00007771 66A3[E9F30000]      <1> 	mov	[File_Minute], ax
  2189                              <1> 
  2190                              <1> 	;mov	al, dh
  2191 00007777 88F8                <1> 	mov	al, bh
  2192 00007779 C0E803              <1> 	shr	al, 3		; shift right 3 times
  2193 0000777C D40A                <1> 	aam			; [AL]+[AH]= Hours as BCD
  2194 0000777E 660D3030            <1> 	or	ax, '00'
  2195 00007782 86E0                <1> 	xchg	ah, al
  2196 00007784 66A3[E6F30000]      <1> 	mov     [File_Hour], ax
  2197                              <1> 
  2198 0000778A C1EB10              <1> 	shr	ebx, 16		; BX = Date
  2199                              <1> 	
  2200                              <1> Dir_Date_start:
  2201 0000778D 6689D8              <1> 	mov	ax, bx		; Date
  2202 00007790 6683E01F            <1> 	and	ax, 00011111b	; Day Mask
  2203 00007794 D40A                <1> 	aam			; Q([AL]/10)->AH
  2204                              <1> 				; R([AL]/10)->AL
  2205                              <1> 				; [AL]+[AH]= Day as BCD
  2206 00007796 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2207 0000779A 86C4                <1> 	xchg	al, ah
  2208                              <1> 
  2209 0000779C 66A3[DBF30000]      <1> 	mov	[File_Day], ax
  2210                              <1> 
  2211 000077A2 6689D8              <1> 	mov	ax, bx
  2212 000077A5 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2213 000077A9 6683E00F            <1> 	and	ax, 00001111b	; Month Mask
  2214 000077AD D40A                <1> 	aam
  2215 000077AF 660D3030            <1> 	or	ax, '00'
  2216 000077B3 86E0                <1> 	xchg	ah, al
  2217 000077B5 66A3[DEF30000]      <1> 	mov	[File_Month], ax
  2218                              <1> 
  2219 000077BB 6689D8              <1> 	mov	ax, bx
  2220 000077BE 66C1E809            <1> 	shr     ax, 9
  2221 000077C2 6683E07F            <1> 	and	ax, 01111111b	; Result = Year - 1980
  2222 000077C6 6605BC07            <1> 	add	ax, 1980
  2223                              <1> 
  2224 000077CA B10A                <1> 	mov	cl, 10
  2225 000077CC F6F1                <1> 	div	cl		; Q -> AL, R -> AH 
  2226 000077CE 80CC30              <1> 	or	ah, '0'
  2227 000077D1 8825[E4F30000]      <1> 	mov	[File_Year+3], ah
  2228 000077D7 D40A                <1> 	aam
  2229 000077D9 86E0                <1> 	xchg	ah, al
  2230 000077DB 80CC30              <1> 	or	ah, '0'	  ; Convert to ASCII
  2231 000077DE 8825[E3F30000]      <1> 	mov	[File_Year+2], ah
  2232 000077E4 D40A                <1> 	aam
  2233 000077E6 86C4                <1> 	xchg	al, ah
  2234 000077E8 660D3030            <1> 	or	ax, '00'
  2235 000077EC 66A3[E1F30000]      <1> 	mov	[File_Year], ax
  2236                              <1> 
  2237                              <1> loc_show_line:
  2238 000077F2 56                  <1> 	push	esi
  2239 000077F3 BE[BEF30000]        <1> 	mov     esi, File_Name
  2240 000077F8 E874E4FFFF          <1> 	call	print_msg
  2241 000077FD BE[97020100]        <1> 	mov	esi, nextline
  2242 00007802 E86AE4FFFF          <1> 	call	print_msg
  2243 00007807 5E                  <1> 	pop	esi
  2244                              <1> 
  2245 00007808 FE0D[B13E0100]      <1> 	dec	byte [PrintDir_RowCounter]
  2246 0000780E 0F84D4000000        <1>         jz      pause_dir_scroll
  2247                              <1> 
  2248                              <1> loc_next_entry:
  2249 00007814 E899010000          <1> 	call	find_next_file
  2250 00007819 0F8391FEFFFF        <1>         jnc     loc_dfname_use_this
  2251                              <1> 
  2252                              <1> loc_dir_ok:
  2253 0000781F B90A000000          <1> 	mov     ecx, 10
  2254 00007824 66A1[9C3E0100]      <1> 	mov	ax, [Dir_Count]
  2255 0000782A BF[FFF30000]        <1> 	mov	edi, Decimal_Dir_Count
  2256 0000782F 6639C8              <1> 	cmp	ax, cx ; 10
  2257 00007832 7216                <1> 	jb	short pass_ddc
  2258 00007834 47                  <1> 	inc	edi
  2259 00007835 6683F864            <1> 	cmp	ax, 100
  2260 00007839 720F                <1> 	jb	short pass_ddc
  2261 0000783B 47                  <1> 	inc	edi
  2262 0000783C 663DE803            <1> 	cmp	ax, 1000
  2263 00007840 7208                <1> 	jb	short pass_ddc
  2264 00007842 47                  <1> 	inc	edi
  2265 00007843 663D1027            <1> 	cmp	ax, 10000
  2266 00007847 7201                <1> 	jb	short pass_ddc
  2267 00007849 47                  <1> 	inc	edi
  2268                              <1> pass_ddc:
  2269 0000784A 886F01              <1> 	mov     [edi+1], ch ; 0
  2270                              <1> loc_ddc_rediv:
  2271 0000784D 31D2                <1> 	xor     edx, edx
  2272 0000784F 66F7F1              <1> 	div     cx	; 10
  2273 00007852 80C230              <1> 	add     dl, '0'
  2274 00007855 8817                <1> 	mov     [edi], dl
  2275 00007857 4F                  <1> 	dec     edi
  2276 00007858 6609C0              <1> 	or	ax, ax
  2277 0000785B 75F0                <1> 	jnz	short loc_ddc_rediv
  2278                              <1> 
  2279 0000785D 66A1[9A3E0100]      <1> 	mov     ax, [File_Count]
  2280 00007863 BF[EEF30000]        <1> 	mov     edi, Decimal_File_Count
  2281 00007868 6639C8              <1> 	cmp     ax, cx ; 10
  2282 0000786B 7216                <1> 	jb      short pass_dfc
  2283 0000786D 47                  <1> 	inc     edi
  2284 0000786E 6683F864            <1> 	cmp     ax, 100
  2285 00007872 720F                <1> 	jb      short pass_dfc
  2286 00007874 47                  <1> 	inc     edi
  2287 00007875 663DE803            <1> 	cmp     ax, 1000
  2288 00007879 7208                <1> 	jb      short pass_dfc
  2289 0000787B 47                  <1> 	inc     edi
  2290 0000787C 663D1027            <1> 	cmp     ax, 10000
  2291 00007880 7201                <1> 	jb      short pass_dfc
  2292 00007882 47                  <1> 	inc     edi
  2293                              <1> pass_dfc:
  2294                              <1> 	;mov    cx, 10
  2295 00007883 886F01              <1> 	mov     [edi+1], ch ; 00
  2296                              <1> loc_dfc_rediv:
  2297                              <1> 	;xor	dx, dx
  2298 00007886 30D2                <1> 	xor	dl, dl
  2299 00007888 66F7F1              <1> 	div	cx
  2300 0000788B 80C230              <1> 	add	dl, '0'
  2301 0000788E 8817                <1> 	mov	[edi], dl
  2302 00007890 4F                  <1> 	dec	edi
  2303 00007891 6609C0              <1> 	or	ax, ax
  2304 00007894 75F0                <1> 	jnz	short loc_dfc_rediv
  2305                              <1> 
  2306 00007896 BF[B03E0100]        <1> 	mov     edi, TFS_Dec_End
  2307                              <1>         ;mov    byte [edi], 0
  2308 0000789B A1[9E3E0100]        <1> 	mov     eax, [Total_FSize]
  2309                              <1> 	;mov    ecx, 10
  2310                              <1> rediv_tfs_hex:
  2311                              <1> 	;sub	edx, edx
  2312 000078A0 28D2                <1> 	sub	dl, dl
  2313 000078A2 F7F1                <1> 	div	ecx
  2314 000078A4 80C230              <1> 	add	dl, '0'
  2315 000078A7 4F                  <1> 	dec     edi
  2316 000078A8 8817                <1> 	mov     [edi], dl
  2317 000078AA 21C0                <1> 	and	eax, eax
  2318 000078AC 75F2                <1> 	jnz	short rediv_tfs_hex
  2319                              <1> 	
  2320 000078AE 893D[A23E0100]      <1> 	mov	[TFS_Dec_Begin], edi
  2321 000078B4 BE[ECF30000]        <1> 	mov	esi, Decimal_File_Count_Header
  2322 000078B9 E8B3E3FFFF          <1> 	call	print_msg
  2323 000078BE BE[F4F30000]        <1> 	mov	esi, str_files
  2324 000078C3 E8A9E3FFFF          <1> 	call	print_msg
  2325 000078C8 BE[05F40000]        <1> 	mov	esi, str_dirs
  2326 000078CD E89FE3FFFF          <1> 	call	print_msg
  2327 000078D2 8B35[A23E0100]      <1> 	mov	esi, [TFS_Dec_Begin]
  2328 000078D8 E894E3FFFF          <1> 	call	print_msg
  2329 000078DD BE[16F40000]        <1> 	mov	esi, str_bytes
  2330 000078E2 E88AE3FFFF          <1> 	call	print_msg
  2331                              <1> 
  2332 000078E7 C3                  <1> 	retn
  2333                              <1> 
  2334                              <1> pause_dir_scroll:
  2335 000078E8 28E4                <1> 	sub	ah, ah           
  2336 000078EA E81893FFFF          <1> 	call	int16h
  2337 000078EF 3C1B                <1> 	cmp	al, 1Bh
  2338 000078F1 0F8428FFFFFF        <1>         je      loc_dir_ok
  2339 000078F7 C605[B13E0100]10    <1> 	mov	byte [PrintDir_RowCounter], 16 ; Reset counter
  2340 000078FE 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 00007903 66A3[623E0100]      <1> 	mov	[FindFile_AttributesMask], ax
  2375 00007909 BF[643E0100]        <1> 	mov	edi, FindFile_DirEntry ; TR-DOS Fullfilename formatted buffer
  2376 0000790E 31C0                <1> 	xor	eax, eax
  2377 00007910 B90B000000          <1> 	mov	ecx, 11
  2378 00007915 F3AB                <1> 	rep	stosd	; 44 bytes
  2379                              <1> 	;stosw		; +2 bytes 
  2380                              <1> 	    
  2381 00007917 BF[543E0100]        <1> 	mov	edi, FindFile_Name ; FFF structure, offset 66
  2382 0000791C 39FE                <1> 	cmp	esi, edi
  2383 0000791E 7408                <1> 	je	short loc_fff_mfn_ok
  2384 00007920 89FA                <1> 	mov	edx, edi 
  2385                              <1> 	 ; move 13 bytes
  2386 00007922 A5                  <1> 	movsd
  2387 00007923 A5                  <1> 	movsd
  2388 00007924 A5                  <1> 	movsd
  2389 00007925 AA                  <1> 	stosb
  2390 00007926 89D6                <1> 	mov	esi, edx
  2391                              <1> loc_fff_mfn_ok:
  2392 00007928 BF[033E0100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2393 0000792D E81D210000          <1> 	call	convert_file_name
  2394 00007932 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2395                              <1> 
  2396 00007934 66A1[623E0100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2397                              <1> 	;xor	ecx, ecx
  2398 0000793A 30C9                <1> 	xor	cl, cl  
  2399 0000793C E8191E0000          <1> 	call	locate_current_dir_file
  2400 00007941 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 00007943 30ED                <1> 	xor	ch, ch 
  2406 00007945 80F60F              <1> 	xor	dh, 0Fh
  2407 00007948 7408                <1> 	jz	short loc_fff_longname_yes
  2408 0000794A 882D[613E0100]      <1> 	mov	[FindFile_LongNameYes], ch ; 0
  2409 00007950 EB0C                <1> 	jmp	short loc_fff_longname_no
  2410                              <1> 
  2411                              <1> loc_fff_longname_yes:
  2412                              <1> 	;inc	byte [FindFile_LongNameYes]
  2413 00007952 8A0D[6E3D0100]      <1> 	mov	cl, [LFN_EntryLength]  
  2414 00007958 880D[613E0100]      <1> 	mov	[FindFile_LongNameEntryLength], cl ; FindFile_LongNameYes
  2415                              <1> 
  2416                              <1> loc_fff_longname_no:
  2417                              <1> 	;mov	bx, [DirBuff_CurrentEntry]
  2418 0000795E 66891D[8C3E0100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2419 00007965 6689C2              <1> 	mov	dx, ax ; Ambigouos Filename chars used sign > 0
  2420                              <1> 
  2421 00007968 A0[6E340100]        <1> 	mov	al, [Current_Drv]
  2422 0000796D A2[123E0100]        <1> 	mov	[FindFile_Drv], al 
  2423                              <1> 
  2424 00007972 A1[68340100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2425 00007977 A3[843E0100]        <1> 	mov	[FindFile_DirFirstCluster], eax
  2426                              <1> 
  2427 0000797C A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2428 00007981 A3[883E0100]        <1> 	mov	[FindFile_DirCluster], eax
  2429                              <1> 
  2430 00007986 66FF05[8E3E0100]    <1> 	inc	word [FindFile_MatchCounter]
  2431                              <1> 
  2432 0000798D 89FB                <1> 	mov	ebx, edi
  2433 0000798F 89FE                <1> 	mov	esi, edi
  2434 00007991 BF[643E0100]        <1> 	mov	edi, FindFile_DirEntry
  2435 00007996 89F8                <1> 	mov	eax, edi
  2436 00007998 B108                <1> 	mov	cl, 8
  2437 0000799A F3A5                <1> 	rep	movsd
  2438 0000799C 89C6                <1> 	mov	esi, eax
  2439 0000799E 89DF                <1> 	mov	edi, ebx
  2440                              <1> 
  2441 000079A0 A1[803E0100]        <1> 	mov	eax, [FindFile_DirEntry+28] ; File Size
  2442                              <1> 
  2443 000079A5 8A1D[6F3E0100]      <1> 	mov	bl, [FindFile_DirEntry+11] ; File Attributes 
  2444 000079AB 8A3D[613E0100]      <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 000079B1 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 000079B2 66833D[8E3E0100]00  <1> 	cmp	word [FindFile_MatchCounter], 0
  2476 000079BA 7707                <1> 	ja	short loc_start_search_next_file
  2477                              <1> 
  2478                              <1> loc_fnf_stc_retn:
  2479 000079BC F9                  <1> 	stc
  2480                              <1> loc_fnf_ax12h_retn:
  2481 000079BD B80C000000          <1> 	mov	eax, 12 ; No More files
  2482                              <1> ;loc_fnf_retn:
  2483 000079C2 C3                  <1> 	retn
  2484                              <1> 
  2485                              <1> loc_start_search_next_file:
  2486 000079C3 668B1D[8C3E0100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  2487 000079CA 6643                <1> 	inc	bx
  2488 000079CC 663B1D[9B3C0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2489 000079D3 7719                <1> 	ja	short loc_cont_search_next_file
  2490                              <1> 
  2491                              <1> loc_fnf_search:
  2492 000079D5 BE[033E0100]        <1> 	mov	esi, Dir_Entry_Name
  2493 000079DA 66A1[623E0100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2494 000079E0 6631C9              <1> 	xor	cx, cx
  2495 000079E3 E8741E0000          <1> 	call	find_directory_entry
  2496 000079E8 0F8355FFFFFF        <1>         jnc     loc_fff_fnf_ln_check
  2497                              <1> 
  2498                              <1> loc_cont_search_next_file:
  2499 000079EE 31DB                <1> 	xor	ebx, ebx
  2500 000079F0 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  2501 000079F6 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2502 000079FB 01DE                <1> 	add	esi, ebx
  2503                              <1> 
  2504 000079FD 803D[6C340100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2505 00007A04 7608                <1> 	jna	short loc_fnf_check_FAT_type
  2506 00007A06 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2507 00007A0A 72B1                <1> 	jb	short loc_fnf_ax12h_retn
  2508 00007A0C EB06                <1> 	jmp	short loc_fnf_check_next_cluster
  2509                              <1>  
  2510                              <1> loc_fnf_check_FAT_type:
  2511 00007A0E 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
  2512 00007A12 72A9                <1> 	jb	short loc_fnf_ax12h_retn
  2513                              <1> 
  2514                              <1> loc_fnf_check_next_cluster:
  2515 00007A14 A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2516 00007A19 E813380000          <1> 	call	get_next_cluster
  2517 00007A1E 7306                <1> 	jnc	short loc_fnf_load_next_dir_cluster
  2518 00007A20 09C0                <1> 	or	eax, eax
  2519 00007A22 7498                <1> 	jz	short loc_fnf_stc_retn
  2520                              <1> 	;mov	eax, 17 ;Drive not ready or read error
  2521 00007A24 F5                  <1>  	cmc	;stc
  2522                              <1> loc_fnf_retn:
  2523 00007A25 C3                  <1> 	retn
  2524                              <1> 
  2525                              <1> loc_fnf_load_next_dir_cluster:
  2526 00007A26 E8EC390000          <1> 	call	load_FAT_sub_directory
  2527 00007A2B 72F8                <1> 	jc	short loc_fnf_retn
  2528 00007A2D 6631DB              <1> 	xor	bx, bx
  2529 00007A30 66891D[8C3E0100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2530 00007A37 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 00007A39 803E20              <1> 	cmp	byte [esi], 20h
  2539 00007A3C 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 00007A3E C3                  <1> 	retn
  2545                              <1> loc_find_longname:
  2546 00007A3F E87F210000          <1> 	call	find_longname
  2547 00007A44 7328                <1> 	jnc	short loc_print_longname
  2548                              <1> 	
  2549 00007A46 08C0                <1> 	or	al, al
  2550 00007A48 741A                <1> 	jz	short loc_longname_not_found
  2551                              <1> 	  
  2552                              <1> 	; 16/10/2016 (15h -> 15, 17)
  2553 00007A4A 3C0F                <1> 	cmp	al, 15
  2554 00007A4C 0F84C5F7FFFF        <1> 	je	cd_drive_not_ready ; drive not ready
  2555                              <1> 				   ; or
  2556 00007A52 3C11                <1> 	cmp	al, 17		   ; read error	
  2557 00007A54 0F84BDF7FFFF        <1> 	je	cd_drive_not_ready 
  2558                              <1> 
  2559                              <1> loc_ln_file_dir_not_found:
  2560 00007A5A BE[40F30000]        <1> 	mov	esi, Msg_File_Directory_Not_Found
  2561                              <1> 	;call	print_msg	
  2562                              <1>         ;retn
  2563 00007A5F E90DE2FFFF          <1> 	jmp	print_msg
  2564                              <1> 
  2565                              <1> loc_longname_not_found:
  2566 00007A64 BE[5FF30000]        <1>         mov     esi, Msg_LongName_Not_Found
  2567                              <1> 	;call	print_msg	
  2568                              <1>         ;retn
  2569 00007A69 E903E2FFFF          <1> 	jmp	print_msg
  2570                              <1> 
  2571                              <1> loc_print_longname:
  2572                              <1> 	;mov	esi, LongFileName
  2573 00007A6E BF[6E350100]        <1> 	mov	edi, TextBuffer
  2574 00007A73 57                  <1> 	push	edi 
  2575 00007A74 3C00                <1> 	cmp	al, 0
  2576 00007A76 7708                <1> 	ja	short loc_print_longname_1
  2577                              <1> loc_print_FS_longname: ; Singlix FS (64 byte ASCIIZ file name)
  2578 00007A78 AC                  <1> 	lodsb
  2579 00007A79 AA                  <1> 	stosb  
  2580 00007A7A 08C0                <1> 	or	al, al
  2581 00007A7C 75FA                <1> 	jnz	short loc_print_FS_longname
  2582 00007A7E EB07                <1> 	jmp	short loc_print_longname_2
  2583                              <1> 	;
  2584                              <1> loc_print_longname_1: ; MS Windows long name (UNICODE chars)
  2585 00007A80 66AD                <1> 	lodsw
  2586 00007A82 AA                  <1> 	stosb  
  2587 00007A83 08C0                <1> 	or	al, al
  2588 00007A85 75F9                <1> 	jnz	short loc_print_longname_1
  2589                              <1> 	;
  2590                              <1> loc_print_longname_2:	
  2591 00007A87 5E                  <1> 	pop	esi
  2592 00007A88 E8E4E1FFFF          <1> 	call	print_msg
  2593 00007A8D BE[97020100]        <1>   	mov	esi, nextline
  2594                              <1> 	;call	print_msg
  2595                              <1> 	;retn
  2596 00007A92 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 00007A97 BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  2607 00007A9C E879200000          <1> 	call	parse_path_name
  2608 00007AA1 0F825AF9FFFF        <1> 	jc	loc_cmd_failed
  2609                              <1> 
  2610                              <1> loc_show_check_filename_exists:
  2611 00007AA7 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  2612 00007AAC 803E20              <1> 	cmp	byte [esi], 20h
  2613 00007AAF 0F864CF9FFFF        <1> 	jna	loc_cmd_failed
  2614                              <1> 
  2615                              <1> 	; 15/02/2016 (invalid file name check)
  2616 00007AB5 E809020000          <1> 	call	check_filename 	
  2617 00007ABA 730A                <1> 	jnc	short loc_show_change_drv
  2618                              <1> 
  2619 00007ABC BE[2CF40000]        <1> 	mov	esi, Msg_invalid_name_chars
  2620 00007AC1 E9ABE1FFFF          <1> 	jmp	print_msg
  2621                              <1>    
  2622                              <1> loc_show_change_drv:
  2623 00007AC6 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  2624 00007ACC 8835[CE3C0100]      <1> 	mov	[RUN_CDRV], dh
  2625 00007AD2 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  2626 00007AD8 38F2                <1> 	cmp	dl, dh
  2627 00007ADA 740B                <1> 	je	short loc_show_change_directory
  2628 00007ADC E890EAFFFF          <1> 	call	change_current_drive
  2629                              <1> 	;jc	loc_file_rw_cmd_failed
  2630 00007AE1 0F8245F9FFFF        <1> 	jc	loc_run_cmd_failed
  2631                              <1> 
  2632                              <1> loc_show_change_directory:
  2633 00007AE7 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  2634 00007AEE 7618                <1> 	jna	short loc_findload_showfile
  2635                              <1> 
  2636 00007AF0 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  2637 00007AF6 BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  2638 00007AFB 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2639 00007AFD E8041A0000          <1> 	call	change_current_directory
  2640                              <1> 	;jc	loc_file_rw_cmd_failed
  2641 00007B02 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 00007B08 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  2649 00007B0D BF[033E0100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2650 00007B12 E8381F0000          <1> 	call	convert_file_name
  2651 00007B17 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2652                              <1> 
  2653 00007B19 28C0                <1> 	sub	al, al	; Attrib AND mask = 0
  2654                              <1> 	; Directory attribute : 10h
  2655                              <1> 	; Volume name attribute: 8h
  2656 00007B1B B418                <1> 	mov	ah, 00011000b ; 18h (Attrib NAND, AND --> zero mask)
  2657                              <1> 	;
  2658 00007B1D 6631C9              <1> 	xor	cx, cx  
  2659 00007B20 E8351C0000          <1> 	call	locate_current_dir_file
  2660                              <1> 	;jc	loc_file_rw_cmd_failed
  2661 00007B25 0F8201F9FFFF        <1> 	jc	loc_run_cmd_failed
  2662                              <1> 
  2663                              <1> loc_show_load_file:
  2664                              <1> 	; EDI = Directory Entry
  2665 00007B2B 668B4714            <1> 	mov	ax, [edi+DirEntry_FstClusHI] ; First Cluster High Word
  2666 00007B2F C1E010              <1> 	shl	eax, 16
  2667 00007B32 668B471A            <1> 	mov	ax, [edi+DirEntry_FstClusLO] ; First Cluster Low Word
  2668 00007B36 A3[BC3E0100]        <1> 	mov	[Show_Cluster], eax
  2669 00007B3B 8B471C              <1> 	mov	eax, [edi+DirEntry_FileSize] ; File Size
  2670 00007B3E 21C0                <1> 	and	eax, eax ; Empty file !
  2671 00007B40 0F8491000000        <1>         jz      end_of_show_file 
  2672 00007B46 A3[C03E0100]        <1> 	mov	[Show_FileSize], eax
  2673 00007B4B 31C0                <1> 	xor	eax, eax
  2674 00007B4D A3[C43E0100]        <1> 	mov	[Show_FilePointer], eax ; 0
  2675 00007B52 66A3[C83E0100]      <1> 	mov	[Show_ClusterPointer], ax ; 0
  2676 00007B58 29DB                <1> 	sub	ebx, ebx
  2677 00007B5A 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  2678 00007B60 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2679 00007B65 01DE                <1> 	add	esi, ebx
  2680 00007B67 8935[B83E0100]      <1> 	mov	[Show_LDDDT], esi ; Logical DOS Drv Description Table addr
  2681                              <1> 
  2682 00007B6D 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0	
  2683 00007B71 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 00007B73 8B15[BC3E0100]      <1> 	mov	edx, [Show_Cluster] ; Compatibility dir. buffer value (FDT)	
  2687 00007B79 8915[B43E0100]      <1> 	mov	[Show_FDT], edx
  2688 00007B7F 31C0                <1> 	xor	eax, eax
  2689 00007B81 A3[BC3E0100]        <1> 	mov	[Show_Cluster], eax ; Sector index  = 0
  2690                              <1> 				    ; (next time it will be 1)			
  2691                              <1> loc_show_calculate_cluster_size:
  2692 00007B86 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 00007B8A 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 00007B8D 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 00007B8F 66A3[CA3E0100]      <1> 	mov	[Show_ClusterSize], ax
  2701                              <1> 
  2702                              <1> loc_start_show_file:
  2703 00007B95 BE[97020100]        <1> 	mov	esi, nextline
  2704 00007B9A E8D2E0FFFF          <1> 	call	print_msg
  2705                              <1> 
  2706 00007B9F A1[BC3E0100]        <1> 	mov	eax, [Show_Cluster]
  2707 00007BA4 C605[CC3E0100]17    <1> 	mov	byte [Show_RowCount], 23
  2708                              <1> 
  2709                              <1> 	; 17/02/2016
  2710 00007BAB 8B35[B83E0100]      <1> 	mov	esi, [Show_LDDDT]
  2711                              <1> 
  2712                              <1> loc_show_next_cluster:
  2713                              <1> 	; 15/02/2016
  2714 00007BB1 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  2715                              <1> 	; ESI = Logical DOS drv description table address
  2716 00007BB6 E89A380000          <1> 	call	read_cluster
  2717                              <1> 	;jc	loc_file_rw_cmd_failed
  2718 00007BBB 0F826BF8FFFF        <1> 	jc	loc_run_cmd_failed
  2719                              <1> 
  2720 00007BC1 31DB                <1> 	xor 	ebx, ebx
  2721                              <1> loc_show_next_byte:
  2722 00007BC3 803D[CC3E0100]00    <1> 	cmp	byte [Show_RowCount], 0
  2723 00007BCA 7521                <1> 	jne	short pass_show_wait_for_key
  2724 00007BCC 30E4                <1> 	xor	ah, ah
  2725 00007BCE E83490FFFF          <1> 	call	int16h
  2726 00007BD3 3C1B                <1> 	cmp	al, 1Bh
  2727 00007BD5 750F                <1> 	jne	short pass_exit_show
  2728                              <1> end_of_show_file:
  2729                              <1> pass_show_file:
  2730 00007BD7 BE[97020100]        <1> 	mov	esi, nextline
  2731 00007BDC E890E0FFFF          <1> 	call	print_msg
  2732 00007BE1 E94D010000          <1> 	jmp	loc_file_rw_restore_retn
  2733                              <1> 
  2734                              <1> pass_exit_show:
  2735 00007BE6 C605[CC3E0100]14    <1> 	mov	byte [Show_RowCount], 20
  2736                              <1> pass_show_wait_for_key:
  2737 00007BED 81C300000700        <1> 	add	ebx, Cluster_Buffer
  2738 00007BF3 8A03                <1> 	mov	al, [ebx]
  2739 00007BF5 3C0D                <1> 	cmp	al, 0Dh
  2740 00007BF7 0F8590000000        <1>         jne     loc_show_check_tab_space
  2741 00007BFD FE0D[CC3E0100]      <1> 	dec	byte [Show_RowCount]
  2742                              <1> pass_show_dec_rowcount:
  2743 00007C03 B307                <1> 	mov	bl, 7 ; (light gray character color, black background)
  2744 00007C05 8A3D[D6330100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2745 00007C0B E893A0FFFF          <1> 	call	_write_tty
  2746                              <1> loc_show_check_eof:
  2747 00007C10 FF05[C43E0100]      <1> 	inc	dword [Show_FilePointer]
  2748 00007C16 A1[C43E0100]        <1> 	mov	eax, [Show_FilePointer]
  2749 00007C1B 3B05[C03E0100]      <1> 	cmp	eax, [Show_FileSize]
  2750 00007C21 73B4                <1> 	jnb	short end_of_show_file
  2751 00007C23 66FF05[C83E0100]    <1> 	inc	word [Show_ClusterPointer]
  2752 00007C2A 0FB71D[C83E0100]    <1> 	movzx	ebx, word [Show_ClusterPointer]
  2753                              <1> 
  2754                              <1> 	; 17/02/2016
  2755                              <1> 	; (sector boundary -9 bits- check, 512 = 0)
  2756 00007C31 66F7C3FF01          <1>         test    bx, 1FFh ;  1 to 511
  2757 00007C36 758B                <1> 	jnz	short loc_show_next_byte
  2758                              <1> 
  2759                              <1> 	; 16/02/2016
  2760 00007C38 8B35[B83E0100]      <1> 	mov	esi, [Show_LDDDT]
  2761                              <1> 	;
  2762 00007C3E 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2763 00007C42 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 00007C44 A1[BC3E0100]        <1> 	mov	eax, [Show_Cluster]
  2768 00007C49 40                  <1> 	inc	eax
  2769 00007C4A A3[BC3E0100]        <1> 	mov	[Show_Cluster], eax
  2770                              <1> 
  2771 00007C4F 6621DB              <1> 	and	bx, bx ; 65536 -> 0
  2772 00007C52 0F856BFFFFFF        <1>         jnz	loc_show_next_byte
  2773 00007C58 E954FFFFFF          <1> 	jmp     loc_show_next_cluster
  2774                              <1> 	 
  2775                              <1> loc_show_check_fat_cluster_size:
  2776                              <1> 	; 17/02/2016
  2777 00007C5D 663B1D[CA3E0100]    <1> 	cmp	bx, [Show_ClusterSize] ; cluster size in bytes
  2778 00007C64 0F8259FFFFFF        <1>         jb	loc_show_next_byte
  2779 00007C6A 66C705[C83E0100]00- <1> 	mov	word [Show_ClusterPointer], 0
  2779 00007C72 00                  <1>
  2780                              <1> 
  2781 00007C73 A1[BC3E0100]        <1> 	mov	eax, [Show_Cluster]
  2782                              <1> 	;mov	esi, [Show_LDDDT]
  2783                              <1> loc_show_get_next_cluster:
  2784 00007C78 E8B4350000          <1> 	call	get_next_cluster
  2785                              <1> 	;jc	loc_file_rw_cmd_failed
  2786 00007C7D 0F82A9F7FFFF        <1> 	jc	loc_run_cmd_failed
  2787                              <1> loc_show_update_ccluster:
  2788 00007C83 A3[BC3E0100]        <1> 	mov	[Show_Cluster], eax			
  2789 00007C88 E924FFFFFF          <1>         jmp     loc_show_next_cluster
  2790                              <1> 
  2791                              <1> loc_show_check_tab_space:
  2792 00007C8D 3C09                <1> 	cmp	al, 09h
  2793 00007C8F 0F856EFFFFFF        <1>         jne     pass_show_dec_rowcount
  2794                              <1> loc_show_put_tab_space:
  2795 00007C95 8A3D[D6330100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2796 00007C9B E8929CFFFF          <1> 	call	get_cpos
  2797                              <1> 	; dl = cursor column
  2798 00007CA0 80E207              <1> 	and	dl, 7 ; 18/02/2016
  2799                              <1> 	;shr	bh, 1 ; [ACTIVE_PAGE]
  2800 00007CA3 8A3D[D6330100]      <1> 	mov	bh, [ACTIVE_PAGE]
  2801 00007CA9 B307                <1> 	mov	bl, 7 ; color attribute
  2802                              <1> loc_show_put_space_chars:
  2803 00007CAB B020                <1> 	mov	al, 20h ; space
  2804                              <1> 	;mov	bh, [ACTIVE_PAGE] ; [ptty]
  2805                              <1> 	;mov	bl, 7 ; color attribute
  2806 00007CAD 6652                <1> 	push	dx
  2807 00007CAF E8EF9FFFFF          <1> 	call	_write_tty
  2808 00007CB4 665A                <1> 	pop	dx
  2809                              <1> 	; 18/02/2016
  2810 00007CB6 80FA07              <1> 	cmp	dl, 7
  2811 00007CB9 0F8351FFFFFF        <1> 	jnb	loc_show_check_eof
  2812 00007CBF FEC2                <1> 	inc	dl
  2813 00007CC1 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 00007CC3 56                  <1> 	push	esi
  2849                              <1> 
  2850 00007CC4 BF[14F10000]        <1>         mov     edi, invalid_fname_chars
  2851 00007CC9 AC                  <1> 	lodsb
  2852                              <1> check_filename_next_char:
  2853 00007CCA B914000000          <1> 	mov	ecx, sizeInvFnChars
  2854 00007CCF BF[14F10000]        <1> 	mov	edi, invalid_fname_chars
  2855                              <1> loc_scan_invalid_filename_char:
  2856 00007CD4 AE                  <1> 	scasb 
  2857 00007CD5 741F                <1> 	je	short loc_invalid_filename_stc 
  2858 00007CD7 E2FB                <1> 	loop	loc_scan_invalid_filename_char
  2859 00007CD9 AC                  <1> 	lodsb
  2860 00007CDA 3C1F                <1> 	cmp	al, 1Fh  ; 20h and above 
  2861 00007CDC 77EC                <1> 	ja	short check_filename_next_char
  2862                              <1> 
  2863                              <1> check_filename_dot:
  2864 00007CDE 8B3424              <1> 	mov	esi, [esp]
  2865                              <1> 
  2866 00007CE1 B421                <1> 	mov	ah, 21h
  2867 00007CE3 B908000000          <1> 	mov	ecx, 8
  2868                              <1> loc_check_filename_next_char:
  2869 00007CE8 AC                  <1> 	lodsb
  2870 00007CE9 3C2E                <1> 	cmp	al, 2Eh
  2871 00007CEB 7511                <1> 	jne	short pass_check_fn_dot_check
  2872                              <1> loc_check_filename_ext_0:
  2873 00007CED AC                  <1> 	lodsb
  2874 00007CEE 38E0                <1> 	cmp	al, ah ; 21h
  2875 00007CF0 7205                <1> 	jb	short loc_invalid_filename
  2876 00007CF2 3C2E                <1> 	cmp	al, 2Eh
  2877 00007CF4 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 00007CF6 F9                  <1> 	stc
  2882                              <1> loc_invalid_filename:
  2883                              <1> 	; 10/10/2016 (0Bh -> 26)
  2884 00007CF7 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; (=26)
  2885                              <1> 	; Invalid file name chars
  2886                              <1> loc_check_fn_rtn:
  2887 00007CFC 5E                  <1> 	pop	esi
  2888 00007CFD C3                  <1> 	retn
  2889                              <1> 
  2890                              <1> pass_check_fn_dot_check:
  2891 00007CFE 38E0                <1> 	cmp	al, ah ; 21h
  2892 00007D00 7224                <1> 	jb	short loc_check_fn_clc_rtn
  2893 00007D02 E2E4                <1> 	loop	loc_check_filename_next_char
  2894 00007D04 AC                  <1> 	lodsb
  2895 00007D05 38E0                <1> 	cmp	al, ah ; 21h
  2896 00007D07 721D                <1> 	jb	short loc_check_fn_clc_rtn
  2897 00007D09 3C2E                <1> 	cmp	al, 2Eh
  2898 00007D0B 75E9                <1> 	jne	short loc_check_fn_stc_rtn
  2899 00007D0D EBDE                <1> 	jmp	short loc_check_filename_ext_0
  2900                              <1> 
  2901                              <1> loc_check_filename_ext_1:
  2902 00007D0F AC                  <1> 	lodsb
  2903 00007D10 38E0                <1> 	cmp	al, ah ; 21h
  2904 00007D12 7212                <1> 	jb	short loc_check_fn_clc_rtn
  2905 00007D14 3C2E                <1> 	cmp	al, 2Eh
  2906 00007D16 74DE                <1> 	je	short loc_check_fn_stc_rtn
  2907 00007D18 AC                  <1> 	lodsb
  2908 00007D19 38E0                <1> 	cmp	al, ah ; 21h
  2909 00007D1B 7209                <1> 	jb	short loc_check_fn_clc_rtn
  2910 00007D1D 3C2E                <1> 	cmp	al, 2Eh
  2911 00007D1F 74D5                <1> 	je	short loc_check_fn_stc_rtn
  2912 00007D21 AC                  <1> 	lodsb
  2913 00007D22 38E0                <1> 	cmp	al, ah ; 21h
  2914 00007D24 73D0                <1> 	jnb	short loc_check_fn_stc_rtn
  2915                              <1> 
  2916                              <1> loc_check_fn_clc_rtn:
  2917 00007D26 5E                  <1> 	pop	esi
  2918 00007D27 F8                  <1> 	clc
  2919 00007D28 C3                  <1> 	retn
  2920                              <1> 
  2921                              <1> loc_print_deleted_message:
  2922 00007D29 BE[01F50000]        <1> 	mov	esi, Msg_Deleted
  2923 00007D2E 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 00007D33 9C                  <1> 	pushf 
  2932 00007D34 E84DF7FFFF          <1> 	call	restore_cdir_after_cmd_fail	
  2933 00007D39 9D                  <1> 	popf
  2934 00007D3A 720D                <1> 	jc	short loc_file_rw_check_write_fault
  2935 00007D3C C3                  <1> 	retn
  2936                              <1> 
  2937                              <1> loc_permission_denied:
  2938                              <1> 	; 27/02/2016
  2939 00007D3D BE[0EF50000]        <1> 	mov	esi, Msg_Permission_Denied
  2940 00007D42 E82ADFFFFF          <1> 	call	print_msg
  2941 00007D47 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 00007D49 3C12                <1>         cmp	al, 18 ; 05/11/2016
  2946 00007D4B 0F85E0F6FFFF        <1> 	jne     loc_run_cmd_failed_cmp_al
  2947 00007D51 BE[F5F20000]        <1> 	mov	esi, Msg_Not_Ready_Write_Err
  2948                              <1> 	;call	print_msg
  2949                              <1> 	;retn
  2950 00007D56 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 00007D5B 803E20              <1> 	cmp	byte [esi], 20h
  2962 00007D5E 7701                <1>         ja	short loc_mkdir_parse_path_name
  2963                              <1> 
  2964                              <1> loc_mkdir_nodirname_retn:
  2965 00007D60 C3                  <1> 	retn
  2966                              <1> 
  2967                              <1> loc_mkdir_parse_path_name:
  2968 00007D61 BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  2969 00007D66 E8AF1D0000          <1>         call    parse_path_name
  2970 00007D6B 0F8290F6FFFF        <1> 	jc	loc_cmd_failed
  2971                              <1> 
  2972                              <1> loc_mkdir_check_dirname_exists:
  2973 00007D71 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  2974 00007D76 803E20              <1> 	cmp	byte [esi], 20h
  2975 00007D79 0F8682F6FFFF        <1> 	jna	loc_cmd_failed
  2976 00007D7F 8935[D03E0100]      <1> 	mov	[DelFile_FNPointer], esi
  2977 00007D85 E839FFFFFF          <1> 	call	check_filename
  2978 00007D8A 7259                <1> 	jc	short loc_mkdir_invalid_dir_name_chars
  2979                              <1> 
  2980                              <1> loc_mkdir_drv:
  2981 00007D8C 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  2982 00007D92 8835[CE3C0100]      <1> 	mov	[RUN_CDRV], dh
  2983                              <1> 	
  2984 00007D98 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  2985 00007D9E 38F2                <1> 	cmp	dl, dh
  2986 00007DA0 7407                <1> 	je	short loc_mkdir_change_directory
  2987                              <1> 
  2988 00007DA2 E8CAE7FFFF          <1> 	call	change_current_drive
  2989 00007DA7 728A                <1> 	jc	loc_file_rw_cmd_failed
  2990                              <1> 
  2991                              <1> loc_mkdir_change_directory:
  2992 00007DA9 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  2993 00007DB0 7614                <1> 	jna	short loc_mkdir_find_directory
  2994                              <1> 
  2995 00007DB2 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  2996 00007DB8 BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  2997 00007DBD 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2998 00007DBF E842170000          <1> 	call	change_current_directory
  2999 00007DC4 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 00007DC6 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3007                              <1> 	;xor	eax, eax
  3008 00007DCC 6631C0              <1> 	xor	ax, ax ; any name (dir, file, volume)
  3009 00007DCF E82FFBFFFF          <1> 	call	find_first_file
  3010 00007DD4 721E                <1> 	jc	short loc_mkdir_check_error_code
  3011                              <1> 
  3012                              <1> loc_mkdir_directory_found:
  3013 00007DD6 BE[59F40000]        <1> 	mov	esi, Msg_Name_Exists
  3014 00007DDB E891DEFFFF          <1> 	call	print_msg
  3015                              <1> 
  3016 00007DE0 E94EFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3017                              <1> 
  3018                              <1> loc_mkdir_invalid_dir_name_chars:
  3019 00007DE5 BE[2CF40000]        <1> 	mov	esi, Msg_invalid_name_chars
  3020 00007DEA E882DEFFFF          <1> 	call	print_msg
  3021                              <1> 
  3022 00007DEF E93FFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3023                              <1> 
  3024                              <1> loc_mkdir_check_error_code:
  3025 00007DF4 3C02                <1> 	cmp	al, 2
  3026                              <1> 	;je	short loc_mkdir_directory_not_found
  3027 00007DF6 7406                <1> 	je	short loc_mkdir_ask_for_yes_no
  3028 00007DF8 F9                  <1> 	stc
  3029 00007DF9 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 00007DFE BE[7AF40000]        <1> 	mov	esi, Msg_DoYouWantMkdir
  3034 00007E03 E869DEFFFF          <1> 	call	print_msg
  3035 00007E08 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3036 00007E0E E85EDEFFFF          <1> 	call	print_msg
  3037 00007E13 BE[99F40000]        <1> 	mov	esi, Msg_YesNo
  3038 00007E18 E854DEFFFF          <1> 	call	print_msg
  3039                              <1> 
  3040 00007E1D C605[A3F40000]20    <1> 	mov	byte [Y_N_nextline], 20h
  3041                              <1> 
  3042                              <1> loc_mkdir_ask_again:
  3043 00007E24 30E4                <1> 	xor	ah, ah
  3044 00007E26 E8DC8DFFFF          <1> 	call	int16h
  3045 00007E2B 3C1B                <1> 	cmp	al, 1Bh
  3046                              <1> 	;je	short loc_do_not_make_directory
  3047 00007E2D 7447                <1> 	je	short loc_mkdir_y_n_escape
  3048 00007E2F 24DF                <1> 	and	al, 0DFh ; y -> Y, n -> N
  3049 00007E31 3C59                <1> 	cmp	al, 'Y' ; 'yes'
  3050 00007E33 7404                <1> 	je	short loc_mkdir_yes_make_directory
  3051 00007E35 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3052 00007E37 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 00007E39 A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  3057 00007E3E 6650                <1> 	push	ax
  3058 00007E40 BE[A3F40000]        <1> 	mov	esi, Y_N_nextline
  3059 00007E45 E827DEFFFF          <1> 	call	print_msg
  3060 00007E4A 6658                <1> 	pop	ax
  3061                              <1> 	;cmp	al, 'Y' ; 'yes'
  3062                              <1> 	;cmc
  3063                              <1>         ;jnc	loc_file_rw_restore_retn
  3064 00007E4C 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3065 00007E4E 0F84DFFEFFFF        <1>         je	loc_file_rw_restore_retn  
  3066                              <1> 
  3067                              <1> loc_mkdir_call_make_sub_directory:
  3068 00007E54 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3069 00007E5A B110                <1> 	mov	cl, 10h ; Directory attributes 
  3070 00007E5C E8B81D0000          <1> 	call	make_sub_directory
  3071                              <1> loc_rename_file_ok: ; 06/03/2016
  3072 00007E61 0F82CCFEFFFF        <1>         jc	loc_file_rw_cmd_failed
  3073                              <1> move_source_file_to_destination_OK:
  3074 00007E67 BE[A7F40000]        <1> 	mov	esi, Msg_OK
  3075 00007E6C E800DEFFFF          <1> 	call	print_msg
  3076 00007E71 E9BDFEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3077                              <1> 
  3078                              <1> loc_mkdir_y_n_escape:
  3079 00007E76 B04E                <1> 	mov	al, 'N' ; 'no'
  3080 00007E78 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 00007E7A 803E20              <1> 	cmp	byte [esi], 20h
  3096 00007E7D 7701                <1>         ja	short loc_rmdir_parse_path_name
  3097                              <1> 
  3098                              <1> loc_rmdir_nodirname_retn:
  3099 00007E7F C3                  <1> 	retn
  3100                              <1> 
  3101                              <1> loc_rmdir_parse_path_name:
  3102 00007E80 BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  3103 00007E85 E8901C0000          <1> 	call	parse_path_name
  3104 00007E8A 0F8271F5FFFF        <1> 	jc	loc_cmd_failed
  3105                              <1> 
  3106                              <1> loc_rmdir_check_dirname_exists:
  3107 00007E90 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  3108 00007E95 803E20              <1> 	cmp	byte [esi], 20h
  3109 00007E98 0F8663F5FFFF        <1> 	jna	loc_cmd_failed
  3110 00007E9E 8935[D03E0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3111                              <1> 
  3112                              <1> loc_rmdir_drv:
  3113 00007EA4 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  3114 00007EAA 8835[CE3C0100]      <1> 	mov	[RUN_CDRV], dh
  3115                              <1> 
  3116 00007EB0 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  3117 00007EB6 38F2                <1> 	cmp	dl, dh
  3118 00007EB8 740B                <1> 	je	short loc_rmdir_change_directory
  3119                              <1> 
  3120 00007EBA E8B2E6FFFF          <1> 	call	change_current_drive
  3121 00007EBF 0F826EFEFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3122                              <1> 
  3123                              <1> loc_rmdir_change_directory:
  3124 00007EC5 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3125 00007ECC 7614                <1> 	jna	short loc_rmdir_find_directory
  3126                              <1> 
  3127 00007ECE FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  3128 00007ED4 BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  3129 00007ED9 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3130 00007EDB E826160000          <1> 	call	change_current_directory
  3131 00007EE0 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 00007EE2 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3139 00007EE8 66B81008            <1> 	mov	ax, 0810h ; Only directories
  3140 00007EEC E812FAFFFF          <1> 	call	find_first_file
  3141 00007EF1 730A                <1> 	jnc	short loc_rmdir_ambgfn_check
  3142                              <1> 
  3143                              <1> loc_rmdir_check_error_code:
  3144 00007EF3 3C02                <1> 	cmp	al, 2
  3145 00007EF5 740B                <1> 	je	short loc_rmdir_directory_not_found
  3146 00007EF7 F9                  <1> 	stc
  3147 00007EF8 E936FEFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3148                              <1> 
  3149                              <1> loc_rmdir_ambgfn_check:
  3150 00007EFD 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3151 00007F00 740F                <1> 	jz	short loc_rmdir_directory_found
  3152                              <1> 
  3153                              <1> loc_rmdir_directory_not_found:
  3154 00007F02 BE[17F30000]        <1> 	mov	esi, Msg_Dir_Not_Found
  3155 00007F07 E865DDFFFF          <1> 	call	print_msg
  3156                              <1> 
  3157 00007F0C E922FEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3158                              <1> 
  3159                              <1> loc_rmdir_directory_found:
  3160 00007F11 80E307              <1> 	and	bl, 07h ; Attributes
  3161 00007F14 0F8523FEFFFF        <1> 	jnz	loc_permission_denied
  3162                              <1> 
  3163                              <1> loc_rmdir_save_lnel: ; 28/02/2016
  3164                              <1>        ;mov	bh, [LongName_EntryLength]
  3165 00007F1A 883D[DA3E0100]      <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 00007F20 57                  <1> 	push	edi ; * (29/02/2016)
  3178                              <1> 
  3179 00007F21 BE[ADF40000]        <1> 	mov	esi, Msg_DoYouWantRmDir
  3180 00007F26 E846DDFFFF          <1> 	call	print_msg
  3181 00007F2B 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3182 00007F31 E83BDDFFFF          <1> 	call	print_msg
  3183 00007F36 BE[99F40000]        <1> 	mov	esi, Msg_YesNo
  3184 00007F3B E831DDFFFF          <1> 	call	print_msg
  3185                              <1> 
  3186                              <1> loc_rmdir_ask_again:
  3187 00007F40 30E4                <1> 	xor	ah, ah
  3188 00007F42 E8C08CFFFF          <1> 	call	int16h
  3189 00007F47 3C1B                <1> 	cmp	al, 1Bh
  3190                              <1> 	;je	short loc_do_not_delete_directory
  3191 00007F49 0F8498000000        <1>         je      loc_rmdir_y_n_escape ; 06/03/2016
  3192 00007F4F 24DF                <1> 	and	al, 0DFh
  3193 00007F51 A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  3194 00007F56 3C59                <1> 	cmp	al, 'Y'
  3195 00007F58 7404                <1> 	je	short loc_rmdir_yes_delete_directory
  3196 00007F5A 3C4E                <1> 	cmp	al, 'N'
  3197 00007F5C 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 00007F5E A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  3202 00007F63 6650                <1> 	push	ax
  3203 00007F65 BE[A3F40000]        <1> 	mov	esi, Y_N_nextline
  3204 00007F6A E802DDFFFF          <1> 	call	print_msg
  3205 00007F6F 6658                <1> 	pop	ax
  3206 00007F71 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 00007F72 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3211 00007F74 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 00007F7A 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3216 00007F7E C1E010              <1>         shl	eax, 16
  3217 00007F81 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3218                              <1> 
  3219 00007F85 A3[D43E0100]        <1> 	mov 	[DelFile_FCluster], eax
  3220                              <1> 
  3221                              <1> 	;mov	bx, [DirBuff_EntryCounter]
  3222 00007F8A 668B1D[8C3E0100]    <1> 	mov	bx, [FindFile_DirEntryNumber] ; 27/02/2016
  3223 00007F91 66891D[D83E0100]    <1> 	mov	[DelFile_EntryCounter], bx
  3224                              <1> 
  3225 00007F98 29DB                <1>     	sub	ebx, ebx
  3226 00007F9A 8A3D[123E0100]      <1> 	mov	bh, [FindFile_Drv]
  3227 00007FA0 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3228 00007FA5 01DE                <1> 	add	esi, ebx
  3229                              <1> 
  3230 00007FA7 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h
  3231 00007FAD 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 00007FAF 8B15[9D3C0100]      <1> 	mov	edx, [DirBuff_Cluster]
  3240 00007FB5 8915[043F0100]      <1> 	mov	[RmDir_ParentDirCluster], edx
  3241                              <1> 
  3242 00007FBB 893D[003F0100]      <1> 	mov	[RmDir_DirEntryOffset], edi
  3243                              <1> 
  3244                              <1> 	; 01/03/2016
  3245 00007FC1 C705[8E3C0100]0000- <1> 	mov	dword [FAT_ClusterCounter], 0 ; Reset
  3245 00007FC9 0000                <1>
  3246                              <1> 
  3247                              <1> loc_rmdir_get_last_cluster:
  3248 00007FCB E85C3A0000          <1> 	call	get_last_cluster
  3249 00007FD0 0F82B8000000        <1>         jc      loc_rmdir_cmd_failed
  3250                              <1> 	
  3251 00007FD6 3B05[D43E0100]      <1> 	cmp	eax, [DelFile_FCluster]
  3252 00007FDC 752F                <1> 	jne	short loc_rmdir_multi_dir_clusters
  3253                              <1> 
  3254 00007FDE C605[FF3E0100]00    <1> 	mov	byte [RmDir_MultiClusters], 0
  3255 00007FE5 EB2D                <1> 	jmp	short pass_rmdir_multi_dir_clusters
  3256                              <1> 
  3257                              <1> loc_rmdir_y_n_escape:
  3258 00007FE7 B04E                <1> 	mov	al, 'N' ; 'no'
  3259 00007FE9 E970FFFFFF          <1>         jmp     loc_do_not_delete_directory
  3260                              <1> 
  3261                              <1> loc_rmdir_delete_fs_directory:
  3262 00007FEE 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  3263 00007FF2 0F8545FDFFFF        <1> 	jne	loc_permission_denied
  3264                              <1> 
  3265 00007FF8 E826140000          <1> 	call	delete_fs_directory
  3266 00007FFD 0F8326FDFFFF        <1> 	jnc	loc_print_deleted_message
  3267                              <1> 
  3268 00008003 09C0                <1> 	or	eax, eax
  3269 00008005 745D                <1> 	jz	loc_rmdir_directory_not_empty_2         
  3270 00008007 F9                  <1> 	stc
  3271 00008008 E926FDFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3272                              <1>  
  3273                              <1> loc_rmdir_multi_dir_clusters:
  3274 0000800D C605[FF3E0100]01    <1> 	mov	byte [RmDir_MultiClusters], 1
  3275                              <1> 
  3276                              <1> pass_rmdir_multi_dir_clusters:
  3277 00008014 A3[083F0100]        <1> 	mov 	[RmDir_DirLastCluster], eax
  3278 00008019 890D[0C3F0100]      <1> 	mov	[RmDir_PreviousCluster], ecx
  3279                              <1> 
  3280                              <1> loc_rmdir_load_fat_sub_directory:
  3281 0000801F E8F3330000          <1> 	call	load_FAT_sub_directory
  3282 00008024 7268                <1> 	jc	loc_rmdir_cmd_failed
  3283                              <1> 
  3284                              <1> loc_rmdir_find_last_dir_entry:
  3285 00008026 56                  <1> 	push	esi
  3286 00008027 BE[F63D0100]        <1> 	mov	esi, Dir_File_Name
  3287 0000802C C6062A              <1> 	mov	byte [esi], '*'
  3288 0000802F C646082A            <1> 	mov	byte [esi+8], '*'
  3289 00008033 31DB                <1> 	xor	ebx, ebx ; Entry offset  = 0
  3290                              <1> loc_rmdir_find_last_dir_entry_next:
  3291 00008035 66B80008            <1> 	mov	ax, 0800h ; Except volume/long names
  3292 00008039 6631C9              <1> 	xor	cx, cx ; 0 = Find a valid file or dir name
  3293 0000803C E81B180000          <1> 	call	find_directory_entry
  3294 00008041 7271                <1> 	jc	short loc_rmdir_empty_dir_cluster
  3295 00008043 83FB01              <1> 	cmp	ebx, 1
  3296 00008046 771B                <1> 	ja	short loc_rmdir_directory_not_empty_1
  3297                              <1> loc_rmdir_dot_entry_check:
  3298 00008048 80FD2E              <1> 	cmp	ch, '.' ; The first char of the dir entry
  3299 0000804B 7516                <1> 	jne	short loc_rmdir_directory_not_empty_1
  3300 0000804D 08DB                <1> 	or	bl, bl
  3301 0000804F 7506                <1> 	jnz	short loc_rmdir_dotdot_entry_check
  3302 00008051 807F0120            <1> 	cmp	byte [edi+1], 20h
  3303 00008055 EB06                <1> 	jmp	short pass_rmdir_dot_entry_check
  3304                              <1> 
  3305                              <1> loc_rmdir_dotdot_entry_check:
  3306 00008057 66817F012E20        <1> 	cmp	word [edi+1], '. '
  3307                              <1> pass_rmdir_dot_entry_check:	
  3308 0000805D 7504                <1> 	jne	short loc_rmdir_directory_not_empty_1 
  3309 0000805F FEC3                <1> 	inc	bl
  3310 00008061 EBD2                <1> 	jmp	short loc_rmdir_find_last_dir_entry_next 
  3311                              <1> 
  3312                              <1> 
  3313                              <1> loc_rmdir_directory_not_empty_1:
  3314 00008063 58                  <1> 	pop	eax ; pushed esi 
  3315                              <1> 
  3316                              <1> loc_rmdir_directory_not_empty_2:
  3317 00008064 BE[CEF40000]        <1> 	mov	esi, Msg_Dir_Not_Empty
  3318 00008069 E803DCFFFF          <1> 	call	print_msg
  3319                              <1> 	; 01/03/2016
  3320 0000806E A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  3321 00008073 09C0                <1> 	or	eax, eax ; 0 ?
  3322 00008075 0F84B8FCFFFF        <1> 	jz	loc_file_rw_restore_retn
  3323                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3324                              <1> 
  3325 0000807B 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> use ESI for Drive parameters
  3326                              <1> 	           ; BL = 1 -> add free clusters
  3327 0000807F E829380000          <1> 	call	calculate_fat_freespace
  3328 00008084 09C9                <1> 	or	ecx, ecx
  3329 00008086 0F84A7FCFFFF        <1>         jz      loc_file_rw_restore_retn ; ecx = 0 -> OK
  3330                              <1> 	; ecx > 0 -> Error (Recalculation is neeeded)
  3331 0000808C EB0E                <1> 	jmp	short loc_rmdir_cmd_return
  3332                              <1> 
  3333                              <1> 
  3334                              <1> loc_rmdir_cmd_failed:
  3335 0000808E 833D[8E3C0100]01    <1> 	cmp	dword [FAT_ClusterCounter], 1
  3336 00008095 0F8298FCFFFF        <1> 	jb	loc_file_rw_cmd_failed	
  3337 0000809B F9                  <1> 	stc
  3338                              <1> loc_rmdir_cmd_return:
  3339                              <1> 	; 01/03/2016
  3340 0000809C 9C                  <1> 	pushf
  3341                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3342 0000809D 66BB00FF            <1> 	mov	bx, 0FF00h ; BH = FFh -> use ESI for Drive parameters
  3343                              <1> 	           ; BL = 0 -> Recalculate free cluster count
  3344 000080A1 50                  <1> 	push	eax
  3345 000080A2 E806380000          <1> 	call	calculate_fat_freespace	
  3346 000080A7 58                  <1> 	pop	eax
  3347 000080A8 9D                  <1> 	popf
  3348 000080A9 0F8284FCFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3349 000080AF E97FFCFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3350                              <1> 
  3351                              <1> 
  3352                              <1> loc_rmdir_empty_dir_cluster:
  3353 000080B4 5E                  <1> 	pop	esi
  3354                              <1> 
  3355                              <1> loc_rmdir_set_prev_cluster_dir_last_cluster:
  3356 000080B5 803D[FF3E0100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3357 000080BC 761D                <1> 	jna	short loc_rmdir_unlink_dir_last_cluster
  3358                              <1> 
  3359 000080BE A1[0C3F0100]        <1> 	mov	eax, [RmDir_PreviousCluster]
  3360                              <1> 	;xor	ecx, ecx
  3361 000080C3 49                  <1> 	dec	ecx ; FFFFFFFFh
  3362 000080C4 E892340000          <1> 	call	update_cluster
  3363 000080C9 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 000080CB 83F801              <1> 	cmp	eax, 1  ; eax = 0 -> end of cluster chain
  3368 000080CE F5                  <1> 	cmc 
  3369 000080CF 72BD                <1> 	jc	short loc_rmdir_cmd_failed
  3370 000080D1 EB1D                <1> 	jmp	short loc_rmdir_save_fat_buffer 
  3371                              <1> 	
  3372                              <1> loc_rmdir_unlink_stc_retn_0Bh:
  3373 000080D3 B81C000000          <1> 	mov	eax, 28 ; Invalid format ; 15/10/2016
  3374 000080D8 F9                  <1> 	stc
  3375 000080D9 EBB3                <1> 	jmp	short loc_rmdir_cmd_failed
  3376                              <1>  
  3377                              <1> loc_rmdir_unlink_dir_last_cluster:
  3378 000080DB A1[083F0100]        <1> 	mov	eax, [RmDir_DirLastCluster]
  3379 000080E0 31C9                <1> 	xor	ecx, ecx ; 0
  3380 000080E2 E874340000          <1> 	call	update_cluster
  3381 000080E7 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 000080E9 09C0                <1> 	or	eax, eax
  3385 000080EB 7403                <1> 	jz	short loc_rmdir_save_fat_buffer ; eocc	
  3386 000080ED F9                  <1> 	stc
  3387 000080EE EB9E                <1>         jmp     short loc_rmdir_cmd_failed
  3388                              <1> 	 
  3389                              <1> loc_rmdir_save_fat_buffer:
  3390 000080F0 803D[863C0100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  3391 000080F7 7525                <1> 	jne	short loc_rmdir_calculate_FAT_freespace
  3392 000080F9 E81A370000          <1> 	call	save_fat_buffer
  3393 000080FE 728E                <1> 	jc	short loc_rmdir_cmd_failed
  3394                              <1> 
  3395                              <1> 	; 01/03/2016
  3396 00008100 803D[FF3E0100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3397 00008107 7615                <1> 	jna	short loc_rmdir_calculate_FAT_freespace
  3398                              <1> 
  3399 00008109 A1[D43E0100]        <1> 	mov	eax, [DelFile_FCluster]
  3400 0000810E E9B8FEFFFF          <1>         jmp     loc_rmdir_get_last_cluster
  3401                              <1> 
  3402                              <1> loc_rmdir_delete_short_name_invalid_data:
  3403 00008113 B81D000000          <1> 	mov	eax, 29 ; Invalid data (15/10/2016)
  3404 00008118 F9                  <1> 	stc
  3405 00008119 E970FFFFFF          <1>         jmp     loc_rmdir_cmd_failed
  3406                              <1> 
  3407                              <1> loc_rmdir_calculate_FAT_freespace:
  3408 0000811E A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  3409 00008123 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 00008127 E881370000          <1> 	call	calculate_fat_freespace
  3414                              <1> 
  3415 0000812C 21C9                <1> 	and	ecx, ecx ; ecx = 0 -> valid free sector count
  3416 0000812E 7409                <1> 	jz 	short loc_rmdir_delete_short_name_continue
  3417                              <1> 
  3418                              <1> loc_rmdir_recalculate_FAT_freespace:
  3419 00008130 66BB00FF            <1>         mov     bx, 0FF00h ; BL = 0 -> Recalculate free space
  3420 00008134 E874370000          <1> 	call	calculate_fat_freespace
  3421                              <1> 	          
  3422                              <1> loc_rmdir_delete_short_name_continue:
  3423 00008139 A1[043F0100]        <1> 	mov	eax, [RmDir_ParentDirCluster]
  3424 0000813E 83F802              <1> 	cmp	eax, 2
  3425 00008141 730D                <1> 	jnb	short loc_rmdir_del_short_name_load_sub_dir
  3426 00008143 E844320000          <1> 	call	load_FAT_root_directory
  3427 00008148 0F82E5FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3428 0000814E 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 00008150 E8C2320000          <1> 	call	load_FAT_sub_directory
  3432 00008155 0F82D8FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3433                              <1> 
  3434                              <1> loc_rmdir_del_short_name_ld_chk_fclust:
  3435 0000815B 0FB73D[003F0100]    <1> 	movzx	edi, word [RmDir_DirEntryOffset]
  3436 00008162 81C700000800        <1> 	add	edi, Directory_Buffer
  3437                              <1> 
  3438 00008168 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3439 0000816C C1E010              <1> 	shl	eax, 16
  3440 0000816F 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3441                              <1>         ; Not necessary... 
  3442 00008173 3B05[D43E0100]      <1> 	cmp	eax, [DelFile_FCluster]
  3443 00008179 7598                <1> 	jne	short loc_rmdir_delete_short_name_invalid_data
  3444                              <1> 	;
  3445 0000817B 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 0000817E C605[983C0100]02    <1>   	mov	byte [DirBuff_ValidData], 2 ; change sign
  3451                              <1> 	;
  3452 00008185 E8F41D0000          <1> 	call	save_directory_buffer
  3453 0000818A 0F82A3FBFFFF        <1> 	jc	loc_file_rw_cmd_failed 
  3454                              <1> 
  3455                              <1> loc_rmdir_del_long_name:
  3456 00008190 0FB615[DA3E0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  3457 00008197 08D2                <1> 	or	dl, dl
  3458 00008199 7414                <1> 	jz	short loc_rmdir_update_parent_dir_lmdt
  3459                              <1>              
  3460 0000819B 0FB705[D83E0100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  3461 000081A2 29D0                <1> 	sub	eax, edx
  3462 000081A4 0F8289FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3463                              <1>  
  3464                              <1>  	; EAX = Directory Entry Number of the long name last entry
  3465 000081AA 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 000081AF E8651E0000          <1> 	call	update_parent_dir_lmdt
  3470                              <1> 	;jc	short loc_file_rw_cmd_failed
  3471                              <1> 
  3472                              <1> loc_rmdir_ok:
  3473 000081B4 BE[A7F40000]        <1> 	mov	esi, Msg_OK
  3474 000081B9 E8B3DAFFFF          <1> 	call	print_msg
  3475 000081BE 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 000081C3 803E20              <1> 	cmp	byte [esi], 20h
  3487 000081C6 7701                <1>         ja	short loc_delfile_parse_path_name
  3488                              <1> 
  3489                              <1> loc_delfile_nofilename_retn:
  3490 000081C8 C3                  <1> 	retn
  3491                              <1> 
  3492                              <1> loc_delfile_parse_path_name:
  3493 000081C9 BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  3494 000081CE E847190000          <1> 	call	parse_path_name
  3495 000081D3 0F8228F2FFFF        <1> 	jc	loc_cmd_failed
  3496                              <1> 
  3497                              <1> loc_delfile_check_filename_exists:
  3498 000081D9 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  3499 000081DE 803E20              <1> 	cmp	byte [esi], 20h
  3500 000081E1 0F861AF2FFFF        <1> 	jna	loc_cmd_failed
  3501 000081E7 8935[D03E0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3502                              <1> 
  3503                              <1> loc_delfile_drv:
  3504 000081ED 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  3505 000081F3 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  3506 000081F9 8835[CE3C0100]      <1> 	mov	[RUN_CDRV], dh
  3507 000081FF 38F2                <1> 	cmp	dl, dh
  3508 00008201 740B                <1> 	je	short loc_delfile_change_directory
  3509                              <1> 
  3510 00008203 E869E3FFFF          <1> 	call	change_current_drive
  3511 00008208 0F8225FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3512                              <1> 
  3513                              <1> loc_delfile_change_directory:
  3514 0000820E 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3515 00008215 7618                <1> 	jna	short loc_delfile_find
  3516                              <1> 
  3517 00008217 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  3518 0000821D BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  3519 00008222 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3520 00008224 E8DD120000          <1> 	call	change_current_directory
  3521 00008229 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 0000822F 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3529 00008235 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3530 00008239 E8C5F6FFFF          <1> 	call	find_first_file
  3531 0000823E 0F82EFFAFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3532                              <1> 
  3533                              <1> loc_delfile_ambgfn_check:
  3534 00008244 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3535 00008247 740B                <1> 	jz	short loc_delfile_found
  3536                              <1> 
  3537                              <1> loc_file_not_found:
  3538 00008249 B802000000          <1> 	mov	eax, 2 ; File not found sign
  3539 0000824E F9                  <1> 	stc
  3540 0000824F E9DFFAFFFF          <1> 	jmp	loc_file_rw_cmd_failed   
  3541                              <1> 
  3542                              <1> loc_delfile_found:
  3543 00008254 80E307              <1> 	and	bl, 07h ; Attributes
  3544 00008257 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 0000825D 57                  <1> 	push	edi ; * (29/02/2016)
  3551                              <1> 
  3552 0000825E BE[E5F40000]        <1> 	mov	esi, Msg_DoYouWantDelete
  3553 00008263 E809DAFFFF          <1> 	call	print_msg
  3554 00008268 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3555 0000826E E8FED9FFFF          <1> 	call	print_msg
  3556 00008273 BE[99F40000]        <1> 	mov	esi, Msg_YesNo
  3557 00008278 E8F4D9FFFF          <1> 	call	print_msg
  3558                              <1> 
  3559                              <1> loc_delfile_ask_again:
  3560 0000827D 30E4                <1> 	xor	ah, ah
  3561 0000827F E88389FFFF          <1> 	call	int16h
  3562 00008284 3C1B                <1> 	cmp	al, 1Bh
  3563                              <1> 	;je	short loc_do_not_delete_file
  3564 00008286 7457                <1> 	je	short loc_delfile_y_n_escape ; 06/03/2016
  3565 00008288 24DF                <1> 	and	al, 0DFh
  3566 0000828A A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  3567 0000828F 3C59                <1> 	cmp	al, 'Y'
  3568 00008291 7404                <1> 	je	short loc_yes_delete_file
  3569 00008293 3C4E                <1> 	cmp	al, 'N'
  3570 00008295 75E6                <1> 	jne	short loc_delfile_ask_again
  3571                              <1> 
  3572                              <1> loc_do_not_delete_file:
  3573                              <1> loc_yes_delete_file:
  3574 00008297 A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  3575 0000829C 6650                <1> 	push	ax
  3576 0000829E BE[A3F40000]        <1> 	mov	esi, Y_N_nextline
  3577 000082A3 E8C9D9FFFF          <1> 	call	print_msg
  3578 000082A8 6658                <1> 	pop	ax
  3579 000082AA 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 000082AB 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3584 000082AD 0F8480FAFFFF        <1>         je	loc_file_rw_restore_retn  
  3585                              <1> 
  3586                              <1> loc_delete_file:
  3587 000082B3 8A3D[123E0100]      <1> 	mov	bh, [FindFile_Drv]
  3588                              <1> 	;mov	bl, [DelFile_LNEL]
  3589 000082B9 8A1D[613E0100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  3590                              <1> 	;mov	cx, [DirBuff_EntryCounter]
  3591 000082BF 668B0D[8C3E0100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  3592                              <1> 	; (*) EDI = Directory buffer entry offset/address 
  3593 000082C6 E8FD1F0000          <1> 	call	remove_file ; (FILE.ASM, 'proc_delete_file')
  3594 000082CB 0F8358FAFFFF        <1> 	jnc	loc_print_deleted_message
  3595                              <1> 
  3596 000082D1 3C05                <1> 	cmp	al, 05h
  3597 000082D3 0F8464FAFFFF        <1> 	je	loc_permission_denied
  3598 000082D9 F9                  <1> 	stc
  3599 000082DA E954FAFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3600                              <1> 
  3601                              <1> loc_delfile_y_n_escape:
  3602 000082DF B04E                <1> 	mov	al, 'N' ; 'no'
  3603 000082E1 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 000082E3 6631C0              <1> 	xor	ax, ax
  3614 000082E6 66A3[36F50000]      <1> 	mov	[Attr_Chars], ax
  3615 000082EC A2[283F0100]        <1> 	mov	[Attributes], al
  3616                              <1> 
  3617                              <1> get_attrib_fchar:
  3618                              <1> 	; esi = file name
  3619 000082F1 8A06                <1> 	mov	al, [esi]
  3620 000082F3 3C20                <1> 	cmp	al, 20h
  3621 000082F5 7623                <1> 	jna	short loc_attr_file_nofilename_retn
  3622                              <1> 
  3623                              <1> loc_scan_attrib_params:
  3624 000082F7 3C2D                <1> 	cmp	al, '-'
  3625 000082F9 0F871C010000        <1> 	ja	loc_attr_file_parse_path_name
  3626 000082FF 7408                <1> 	je	short loc_attr_space
  3627                              <1> 
  3628 00008301 3C2B                <1> 	cmp	al, '+'
  3629 00008303 0F85F8F0FFFF        <1> 	jne	loc_cmd_failed
  3630                              <1> 
  3631                              <1> loc_attr_space:
  3632 00008309 8A6601              <1> 	mov	ah, [esi+1]
  3633 0000830C 80FC20              <1>  	cmp	ah, 20h
  3634 0000830F 770A                <1> 	ja	short pass_attr_space
  3635 00008311 0F82EAF0FFFF        <1> 	jb	loc_cmd_failed
  3636 00008317 46                  <1> 	inc	esi
  3637 00008318 EBEF                <1> 	jmp	short loc_attr_space
  3638                              <1> 
  3639                              <1> loc_attr_file_nofilename_retn:
  3640 0000831A C3                  <1> 	retn
  3641                              <1> 
  3642                              <1> pass_attr_space:
  3643 0000831B 80E4DF              <1> 	and	ah, 0DFh
  3644 0000831E 80FC53              <1> 	cmp	ah, 'S'
  3645 00008321 0F87DAF0FFFF        <1> 	ja	loc_cmd_failed
  3646 00008327 7204                <1> 	jb	short pass_attr_system
  3647 00008329 B404                <1> 	mov	ah, 04h   ; System
  3648 0000832B EB21                <1> 	jmp	short pass_attr_archive
  3649                              <1> 
  3650                              <1> pass_attr_system:
  3651 0000832D 80FC48              <1> 	cmp	ah, 'H'
  3652 00008330 7706                <1> 	ja	short pass_attr_hidden
  3653 00008332 7213                <1> 	jb	short pass_attr_read_only
  3654 00008334 B402                <1> 	mov	ah, 02h    ; Hidden
  3655 00008336 EB16                <1> 	jmp	short pass_attr_archive
  3656                              <1> 
  3657                              <1> pass_attr_hidden:
  3658 00008338 80FC52              <1> 	cmp	ah, 'R'
  3659 0000833B 0F87C0F0FFFF        <1> 	ja	loc_cmd_failed
  3660 00008341 7204                <1> 	jb	short pass_attr_read_only ; Read only
  3661 00008343 B401                <1> 	mov	ah, 01h
  3662 00008345 EB07                <1> 	jmp	short pass_attr_archive
  3663                              <1> 
  3664                              <1> pass_attr_read_only:
  3665 00008347 80FC41              <1> 	cmp	ah, 'A'
  3666 0000834A 753B                <1> 	jne	short loc_chk_attr_enter
  3667 0000834C B420                <1> 	mov	ah, 20h    ; Archive
  3668                              <1> 
  3669                              <1> pass_attr_archive:
  3670 0000834E 3C2D                <1> 	cmp	al, '-'
  3671 00008350 7508                <1> 	jne	short pass_reducing_attributes
  3672 00008352 0825[36F50000]      <1> 	or	[Attr_Chars], ah
  3673 00008358 EB06                <1> 	jmp	short loc_change_attributes_inc
  3674                              <1> 
  3675                              <1> pass_reducing_attributes:
  3676 0000835A 0825[37F50000]      <1> 	or	[Attr_Chars+1], ah
  3677                              <1> 
  3678                              <1> loc_change_attributes_inc:
  3679 00008360 46                  <1> 	inc	esi
  3680 00008361 8A6601              <1> 	mov	ah, [esi+1]
  3681 00008364 80FC20              <1> 	cmp	ah, 20h
  3682 00008367 7227                <1> 	jb	short pass_change_attr
  3683 00008369 74F5                <1> 	je	short loc_change_attributes_inc
  3684 0000836B 80FC2D              <1> 	cmp	ah, '-'
  3685 0000836E 770D                <1> 	ja	short loc_chk_next_attr_char1
  3686 00008370 7405                <1> 	je	short loc_chk_next_attr_char0
  3687 00008372 80FC2B              <1> 	cmp	ah, '+'
  3688 00008375 7506                <1> 	jne	short loc_chk_next_attr_char1
  3689                              <1> 
  3690                              <1> loc_chk_next_attr_char0:
  3691 00008377 46                  <1> 	inc	esi
  3692 00008378 668B06              <1> 	mov	ax, [esi]
  3693 0000837B EB9E                <1> 	jmp	short pass_attr_space
  3694                              <1> 
  3695                              <1> loc_chk_next_attr_char1:
  3696 0000837D 803E2D              <1> 	cmp	byte [esi], '-'
  3697 00008380 7799                <1> 	ja	short pass_attr_space
  3698 00008382 E988000000          <1>         jmp     loc_attr_file_check_fname_fchar
  3699                              <1> 
  3700                              <1> loc_chk_attr_enter:
  3701 00008387 80FC0D              <1> 	cmp	ah, 0Dh
  3702 0000838A 0F8571F0FFFF        <1> 	jne	loc_cmd_failed
  3703                              <1> 
  3704                              <1> pass_change_attr:
  3705 00008390 A0[36F50000]        <1> 	mov	al, [Attr_Chars]
  3706 00008395 F6D0                <1> 	not	al
  3707 00008397 2005[283F0100]      <1> 	and	[Attributes], al
  3708 0000839D A0[37F50000]        <1> 	mov	al, [Attr_Chars+1]
  3709 000083A2 0805[283F0100]      <1> 	or	[Attributes], al
  3710                              <1> 
  3711                              <1> loc_show_attributes:
  3712 000083A8 BE[97020100]        <1> 	mov	esi, nextline
  3713 000083AD E8BFD8FFFF          <1> 	call	print_msg
  3714                              <1> 
  3715                              <1> loc_show_attributes_no_nextline:
  3716 000083B2 C705[36F50000]4E4F- <1> 	mov	dword [Attr_Chars], 'NORM'
  3716 000083BA 524D                <1>
  3717 000083BC 66C705[3AF50000]41- <1> 	mov	word [Attr_Chars+4], 'AL'
  3717 000083C4 4C                  <1>
  3718 000083C5 BE[36F50000]        <1> 	mov	esi, Attr_Chars
  3719 000083CA A0[283F0100]        <1> 	mov	al, [Attributes]
  3720 000083CF A804                <1> 	test	al, 04h
  3721 000083D1 7406                <1> 	jz	short pass_put_attr_s
  3722 000083D3 66C7065300          <1> 	mov	word [esi], 0053h     ; S
  3723 000083D8 46                  <1> 	inc	esi
  3724                              <1> 
  3725                              <1> pass_put_attr_s:
  3726 000083D9 A802                <1> 	test	al, 02h
  3727 000083DB 7406                <1> 	jz	short pass_put_attr_h
  3728 000083DD 66C7064800          <1> 	mov	word [esi], 0048h     ; H
  3729 000083E2 46                  <1> 	inc	esi
  3730                              <1> 
  3731                              <1> pass_put_attr_h:
  3732 000083E3 A801                <1> 	test	al, 01h
  3733 000083E5 7406                <1> 	jz	short pass_put_attr_r
  3734 000083E7 66C7065200          <1> 	mov	word [esi], 0052h     ; R
  3735 000083EC 46                  <1> 	inc	esi
  3736                              <1> 
  3737                              <1> pass_put_attr_r:
  3738 000083ED 3C20                <1> 	cmp	al, 20h
  3739 000083EF 7205                <1> 	jb	short pass_put_attr_a
  3740 000083F1 66C7064100          <1> 	mov	word [esi], 0041h     ; A
  3741                              <1> 
  3742                              <1> pass_put_attr_a:
  3743 000083F6 BE[29F50000]        <1> 	mov	esi, Str_Attributes
  3744 000083FB E871D8FFFF          <1> 	call	print_msg
  3745 00008400 BE[97020100]        <1> 	mov	esi, nextline
  3746 00008405 E867D8FFFF          <1> 	call	print_msg
  3747 0000840A E924F9FFFF          <1> 	jmp	loc_file_rw_restore_retn 
  3748                              <1> 
  3749                              <1> loc_attr_file_check_fname_fchar:
  3750 0000840F 46                  <1> 	inc	esi
  3751 00008410 803E20              <1> 	cmp	byte [esi], 20h
  3752 00008413 74FA                <1> 	je	short loc_attr_file_check_fname_fchar
  3753 00008415 0F8275FFFFFF        <1>         jb      pass_change_attr
  3754                              <1> 		   
  3755                              <1> loc_attr_file_parse_path_name:
  3756 0000841B BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  3757 00008420 E8F5160000          <1> 	call	parse_path_name
  3758 00008425 0F82D6EFFFFF        <1> 	jc	loc_cmd_failed
  3759                              <1> 
  3760                              <1> loc_attr_file_check_filename_exists:
  3761 0000842B BE[543E0100]        <1> 	mov	esi, FindFile_Name
  3762 00008430 803E20              <1> 	cmp	byte [esi], 20h
  3763 00008433 0F86C8EFFFFF        <1> 	jna	loc_cmd_failed
  3764 00008439 8935[D03E0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3765                              <1> 
  3766                              <1> loc_attr_file_drv:
  3767 0000843F 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  3768 00008445 8835[CE3C0100]      <1> 	mov	[RUN_CDRV], dh
  3769                              <1> 
  3770 0000844B 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  3771 00008451 38F2                <1> 	cmp	dl, dh
  3772 00008453 740B                <1> 	je	short loc_attr_file_change_directory
  3773                              <1> 
  3774 00008455 E817E1FFFF          <1> 	call	change_current_drive
  3775 0000845A 0F82D3F8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3776                              <1> 
  3777                              <1> loc_attr_file_change_directory:
  3778 00008460 803D[133E0100]20    <1>         cmp     byte [FindFile_Directory], 20h
  3779 00008467 7618                <1> 	jna	short loc_attr_file_find
  3780                              <1> 
  3781 00008469 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  3782                              <1> 	
  3783 0000846F BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  3784 00008474 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3785 00008476 E88B100000          <1> 	call	change_current_directory
  3786 0000847B 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 00008481 8B35[D03E0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3794 00008487 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  3795 0000848B E873F4FFFF          <1> 	call	find_first_file
  3796 00008490 0F829DF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3797                              <1> 
  3798                              <1> loc_attr_file_ambgfn_check:
  3799 00008496 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 00008499 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 0000849F 66833D[36F50000]00  <1> 	cmp	word [Attr_Chars], 0
  3815 000084A7 770B                <1> 	ja	short loc_attr_file_change_attributes
  3816 000084A9 881D[283F0100]      <1> 	mov	[Attributes], bl
  3817 000084AF E9F4FEFFFF          <1> 	jmp	loc_show_attributes
  3818                              <1> 
  3819                              <1> loc_attr_file_change_attributes:
  3820 000084B4 A0[36F50000]        <1> 	mov	al, [Attr_Chars]
  3821 000084B9 F6D0                <1> 	not	al
  3822 000084BB 20C3                <1> 	and	bl, al
  3823 000084BD A0[37F50000]        <1> 	mov	al, [Attr_Chars+1]
  3824 000084C2 08C3                <1> 	or	bl, al
  3825                              <1> 
  3826 000084C4 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
  3827 000084CA 741D                <1> 	je	short loc_attr_file_fs_check
  3828                              <1> 
  3829 000084CC 881D[283F0100]      <1> 	mov	[Attributes], bl
  3830 000084D2 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 000084D5 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  3838                              <1> 
  3839 000084DC E89D1A0000          <1> 	call 	save_directory_buffer
  3840 000084E1 0F824CF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3841                              <1> 
  3842 000084E7 EB33                <1> 	jmp	short loc_print_attr_changed_message
  3843                              <1> 
  3844                              <1> loc_attr_file_fs_check:
  3845 000084E9 29C0                <1> 	sub	eax, eax
  3846 000084EB 8A25[963C0100]      <1>         mov     ah, [DirBuff_DRV]
  3847 000084F1 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3848 000084F6 01C6                <1>         add     esi, eax
  3849 000084F8 807E04A1            <1>         cmp     byte [esi+LD_FSType], 0A1h
  3850 000084FC 7309                <1> 	jnc	short loc_attr_file_change_fs_file_attributes
  3851 000084FE 66B80D00            <1> 	mov	ax, 0Dh ; Invalid Data
  3852 00008502 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 00008507 88D8                <1> 	mov	al, bl ; File/Directory Attributes
  3857 00008509 30E4                <1> 	xor	ah, ah ; Attributes in MS-DOS format sign	  
  3858 0000850B E8A7050000          <1> 	call	change_fs_file_attributes
  3859 00008510 0F821DF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3860                              <1> 
  3861 00008516 881D[283F0100]      <1> 	mov	[Attributes], bl 
  3862                              <1> 
  3863                              <1> loc_print_attr_changed_message:
  3864 0000851C BE[24F50000]        <1> 	mov	esi, Msg_New
  3865 00008521 E84BD7FFFF          <1> 	call	print_msg
  3866 00008526 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 0000852B 803E20              <1> 	cmp	byte [esi], 20h
  3880 0000852E 7614                <1>         jna	short loc_rename_nofilename_retn
  3881                              <1> 
  3882 00008530 8935[503F0100]      <1> 	mov	[SourceFilePath], esi
  3883                              <1> 
  3884                              <1> rename_scan_source_file:
  3885 00008536 46                  <1> 	inc	esi
  3886 00008537 803E20              <1> 	cmp	byte [esi], 20h
  3887 0000853A 7409                <1> 	je	short rename_scan_destination_file_1
  3888                              <1> 	;jb	short loc_rename_nofilename_retn
  3889 0000853C 0F82BFEEFFFF        <1> 	jb	loc_cmd_failed
  3890 00008542 EBF2                <1> 	jmp	short rename_scan_source_file
  3891                              <1> 
  3892                              <1> loc_rename_nofilename_retn: ; 08/03/2016
  3893 00008544 C3                  <1> 	retn
  3894                              <1> 
  3895                              <1> rename_scan_destination_file_1:
  3896 00008545 C60600              <1> 	mov	byte [esi], 0
  3897                              <1> 
  3898                              <1> rename_scan_destination_file_2:
  3899 00008548 46                  <1> 	inc	esi  
  3900 00008549 803E20              <1> 	cmp	byte [esi], 20h
  3901 0000854C 74FA                <1> 	je	short rename_scan_destination_file_2
  3902                              <1> 	;jb	short loc_rename_nofilename_retn
  3903 0000854E 0F82ADEEFFFF        <1> 	jb	loc_cmd_failed
  3904                              <1> 
  3905 00008554 8935[543F0100]      <1> 	mov	[DestinationFilePath], esi
  3906                              <1> 
  3907                              <1> rename_scan_destination_file_3:
  3908 0000855A 46                  <1> 	inc	esi  
  3909 0000855B 803E20              <1> 	cmp	byte [esi], 20h
  3910 0000855E 77FA                <1> 	ja	short rename_scan_destination_file_3
  3911                              <1> 
  3912 00008560 C60600              <1> 	mov	byte [esi], 0
  3913                              <1> 
  3914                              <1> loc_rename_save_current_drive:
  3915 00008563 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  3916 00008569 8835[CE3C0100]      <1> 	mov	byte [RUN_CDRV], dh
  3917                              <1> 
  3918                              <1> loc_rename_sf_parse_path_name:
  3919 0000856F 8B35[503F0100]      <1> 	mov	esi, [SourceFilePath] 
  3920 00008575 BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  3921 0000857A E89B150000          <1> 	call	parse_path_name
  3922 0000857F 0F827CEEFFFF        <1> 	jc	loc_cmd_failed
  3923                              <1> 
  3924                              <1> loc_rename_sf_check_filename_exists:
  3925 00008585 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  3926 0000858A 803E20              <1> 	cmp	byte [esi], 20h
  3927 0000858D 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 00008593 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  3936 00008599 38F2                <1> 	cmp	dl, dh ; dh = [Current_Drv]
  3937 0000859B 740B                <1> 	je	short rename_sf_change_directory
  3938                              <1> 
  3939 0000859D E8CFDFFFFF          <1> 	call	change_current_drive
  3940 000085A2 0F828BF7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3941                              <1> 
  3942                              <1> rename_sf_change_directory:
  3943 000085A8 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3944 000085AF 7618                <1> 	jna	short rename_sf_find
  3945                              <1> 
  3946 000085B1 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  3947 000085B7 BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  3948 000085BC 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3949 000085BE E8430F0000          <1> 	call	change_current_directory
  3950 000085C3 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 000085C9 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  3958                              <1> 
  3959 000085CE 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  3960 000085D2 E82CF3FFFF          <1> 	call	find_first_file
  3961 000085D7 0F8256F7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3962                              <1> 
  3963                              <1> loc_rename_sf_ambgfn_check:
  3964 000085DD 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 000085E0 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 000085E6 F6C307              <1> 	test	bl, 07h ; Attributes, S-H-R
  3980 000085E9 0F854EF7FFFF        <1> 	jnz	loc_permission_denied
  3981                              <1> 	
  3982 000085EF BE[123E0100]        <1>         mov     esi, FindFile_Drv
  3983 000085F4 BF[583F0100]        <1>         mov     edi, SourceFile_Drv
  3984 000085F9 B920000000          <1> 	mov	ecx, 32
  3985 000085FE F3A5                <1> 	rep	movsd
  3986                              <1> 
  3987                              <1> loc_rename_df_parse_path_name:
  3988 00008600 8B35[543F0100]      <1> 	mov	esi, [DestinationFilePath]
  3989 00008606 BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  3990 0000860B E80A150000          <1> 	call	parse_path_name
  3991 00008610 7219                <1> 	jc	short loc_rename_df_cmd_failed
  3992                              <1> 
  3993                              <1> 	;mov	dh, [RUN_CDRV]
  3994 00008612 8A35[6E340100]      <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 00008618 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  4000 0000861E 38F2                <1> 	cmp	dl, dh ; are source and destination drives different ?!
  4001 00008620 7509                <1> 	jne	short loc_rename_df_cmd_failed ; yes! 
  4002                              <1> 
  4003                              <1> rename_df_check_dirname_exists:
  4004 00008622 803D[133E0100]00    <1> 	cmp	byte [FindFile_Directory], 0
  4005 00008629 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 0000862B B801000000          <1> 	mov	eax, 1 ; TRDOS 'Bad command or file name' error
  4010 00008630 F9                  <1> 	stc
  4011 00008631 E9FDF6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4012                              <1> 	  
  4013                              <1> rename_df_check_filename_exists:
  4014 00008636 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  4015 0000863B E883F6FFFF          <1> 	call	check_filename
  4016 00008640 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 00008646 0FB6F6              <1> 	movzx	esi, dh
  4026                              <1> 	;movzx	esi, byte [Current_Drv]
  4027 00008649 81C600010900        <1> 	add	esi, Logical_DOSDisks
  4028                              <1> 
  4029 0000864F 88F2                <1> 	mov	dl, dh ; dl = [Current_Drv]
  4030 00008651 8A7601              <1> 	mov	dh, [esi+LD_DiskType]
  4031                              <1> 
  4032 00008654 80FE01              <1> 	cmp	dh, 1 ; 0 = Invalid
  4033 00008657 7310                <1> 	jnb	short rename_df_compare_sf_df_name
  4034                              <1> 
  4035                              <1> 	; 16/10/2016 (13h -> 30)
  4036 00008659 B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  4037 0000865E 8B1D[543F0100]      <1> 	mov	ebx, [DestinationFilePath] 
  4038 00008664 E9CAF6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4039                              <1> 
  4040                              <1> rename_df_compare_sf_df_name:
  4041 00008669 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  4042 0000866E BF[9A3F0100]        <1> 	mov	edi, SourceFile_Name
  4043 00008673 B90C000000          <1> 	mov	ecx, 12
  4044                              <1> rename_df_compare_sf_df_name_next: 
  4045 00008678 AC                  <1> 	lodsb
  4046 00008679 AE                  <1> 	scasb
  4047 0000867A 7506                <1> 	jne	short loc_rename_df_find
  4048 0000867C 08C0                <1> 	or	al, al
  4049 0000867E 74AB                <1> 	jz	short loc_rename_df_cmd_failed
  4050 00008680 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 00008682 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  4055                              <1> 
  4056 00008687 6631C0              <1> 	xor	ax, ax ; Any
  4057 0000868A E874F2FFFF          <1> 	call	find_first_file
  4058 0000868F 730A                <1> 	jnc	short loc_rename_df_found
  4059                              <1> 
  4060                              <1> loc_rename_df_check_error_code:
  4061                              <1> 	;cmp	eax, 2
  4062 00008691 3C02                <1> 	cmp	al, 2 ; Not found error
  4063 00008693 7411                <1> 	je	short rename_df_move_find_struct_to_dest
  4064 00008695 F9                  <1> 	stc
  4065 00008696 E998F6FFFF          <1> 	jmp loc_file_rw_cmd_failed
  4066                              <1> 
  4067                              <1> loc_rename_df_found:
  4068                              <1> 	; 05/11/2016
  4069 0000869B B805000000          <1> 	mov	eax, 05h ; permission denied error
  4070 000086A0 F9                  <1> 	stc
  4071 000086A1 E997F6FFFF          <1> 	jmp	loc_permission_denied  ; 06/11/2016
  4072                              <1> 
  4073                              <1> rename_df_move_find_struct_to_dest:
  4074 000086A6 BE[123E0100]        <1>         mov     esi, FindFile_Drv
  4075 000086AB BF[D83F0100]        <1>         mov     edi, DestinationFile_Drv
  4076 000086B0 B920000000          <1> 	mov	ecx, 32
  4077 000086B5 F3A5                <1> 	rep	movsd
  4078                              <1> 
  4079                              <1> loc_rename_df_process_q_sf:
  4080                              <1> 	;mov	ecx, 12
  4081 000086B7 B10C                <1> 	mov	cl, 12
  4082 000086B9 BE[9A3F0100]        <1>  	mov	esi, SourceFile_Name
  4083 000086BE BF[65F50000]        <1> 	mov	edi, Rename_OldName
  4084                              <1> rename_df_process_q_nml_1_sf:
  4085 000086C3 AC                  <1> 	lodsb
  4086 000086C4 3C20                <1>         cmp	al, 20h
  4087 000086C6 7603                <1>         jna	short rename_df_process_q_nml_2_sf
  4088 000086C8 AA                  <1> 	stosb
  4089 000086C9 E2F8                <1> 	loop	rename_df_process_q_nml_1_sf
  4090                              <1> 
  4091                              <1> rename_df_process_q_nml_2_sf:
  4092 000086CB C60700              <1> 	mov	byte [edi], 0
  4093                              <1> 
  4094                              <1> loc_rename_df_process_q_df:
  4095                              <1> 	;mov	ecx, 12
  4096 000086CE B10C                <1> 	mov	cl, 12
  4097 000086D0 BE[1A400100]        <1> 	mov	esi, DestinationFile_Name
  4098 000086D5 BF[76F50000]        <1> 	mov	edi, Rename_NewName
  4099                              <1> rename_df_process_q_nml_1_df:
  4100 000086DA AC                  <1> 	lodsb
  4101 000086DB 3C20                <1> 	cmp	al, 20h
  4102 000086DD 7603                <1> 	jna	short loc_rename_df_process_q_nml_2_df
  4103 000086DF AA                  <1> 	stosb
  4104 000086E0 E2F8                <1> 	loop	rename_df_process_q_nml_1_df
  4105                              <1> 
  4106                              <1> loc_rename_df_process_q_nml_2_df:
  4107 000086E2 C60700              <1> 	mov	byte [edi], 0
  4108                              <1> 
  4109                              <1> loc_rename_confirmation_question:
  4110 000086E5 BE[3DF50000]        <1> 	mov	esi, Msg_DoYouWantRename
  4111 000086EA E882D5FFFF          <1> 	call	print_msg
  4112                              <1> 
  4113 000086EF A0[B53F0100]        <1> 	mov	al, [SourceFile_DirEntry+11] ; Attributes
  4114 000086F4 2410                <1> 	and	al, 10h
  4115 000086F6 750C                <1> 	jnz	short rename_confirmation_question_dir
  4116                              <1> 
  4117                              <1> rename_confirmation_question_file:
  4118 000086F8 BE[54F50000]        <1> 	mov	esi, Rename_File
  4119 000086FD E86FD5FFFF          <1> 	call	print_msg 
  4120 00008702 EB0A                <1> 	jmp	short rename_confirmation_question_as 
  4121                              <1> 
  4122                              <1> rename_confirmation_question_dir:
  4123 00008704 BE[5AF50000]        <1> 	mov	esi, Rename_Directory
  4124 00008709 E863D5FFFF          <1> 	call	print_msg
  4125                              <1> 
  4126                              <1> rename_confirmation_question_as:
  4127 0000870E BE[65F50000]        <1> 	mov	esi, Rename_OldName
  4128 00008713 E859D5FFFF          <1> 	call	print_msg
  4129 00008718 BE[72F50000]        <1> 	mov	esi, Msg_File_rename_as
  4130 0000871D E84FD5FFFF          <1> 	call	print_msg
  4131 00008722 BE[99F40000]        <1> 	mov	esi, Msg_YesNo
  4132 00008727 E845D5FFFF          <1> 	call	print_msg
  4133                              <1> 
  4134                              <1> loc_rename_ask_again:
  4135 0000872C 30E4                <1> 	xor	ah, ah
  4136 0000872E E8D484FFFF          <1> 	call	int16h
  4137 00008733 3C1B                <1> 	cmp	al, 1Bh
  4138 00008735 740F                <1> 	je	short loc_do_not_rename_file
  4139 00008737 24DF                <1> 	and	al, 0DFh
  4140 00008739 A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  4141 0000873E 3C59                <1> 	cmp	al, 'Y'
  4142 00008740 7404                <1> 	je	short loc_yes_rename_file
  4143 00008742 3C4E                <1> 	cmp	al, 'N'
  4144 00008744 75E6                <1> 	jne	short loc_rename_ask_again
  4145                              <1> 
  4146                              <1> loc_do_not_rename_file:
  4147                              <1> loc_yes_rename_file:
  4148 00008746 A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  4149 0000874B 6650                <1> 	push	ax
  4150 0000874D BE[A3F40000]        <1> 	mov	esi, Y_N_nextline
  4151 00008752 E81AD5FFFF          <1> 	call	print_msg
  4152 00008757 6658                <1> 	pop	ax
  4153                              <1> 	;cmp	al, 'Y' ; 'yes'
  4154                              <1> 	;cmc
  4155                              <1>         ;jnc	loc_file_rw_restore_retn
  4156 00008759 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4157 0000875B 0F84D2F5FFFF        <1>         je	loc_file_rw_restore_retn  
  4158                              <1> 
  4159 00008761 BE[76F50000]        <1> 	mov	esi, Rename_NewName
  4160 00008766 668B0D[D23F0100]    <1> 	mov	cx, [SourceFile_DirEntryNumber] 
  4161 0000876D 66A1[BE3F0100]      <1> 	mov	ax, [SourceFile_DirEntry+20] ; First Cluster, HW 
  4162 00008773 66C1E010            <1> 	shl	ax, 16
  4163 00008777 66A1[C43F0100]      <1> 	mov	ax, [SourceFile_DirEntry+26] ; First Cluster, LW 
  4164                              <1> 
  4165 0000877D 0FB61D[A73F0100]    <1>   	movzx	ebx, byte [SourceFile_LongNameEntryLength]  
  4166 00008784 E8DB1B0000          <1>    	call	rename_directory_entry
  4167 00008789 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 0000878E 803E20              <1> 	cmp	byte [esi], 20h
  4184 00008791 7614                <1>         jna	short loc_move_nofilename_retn
  4185                              <1> 
  4186 00008793 8935[503F0100]      <1> 	mov	[SourceFilePath], esi
  4187                              <1> 
  4188                              <1> move_scan_source_file:
  4189 00008799 46                  <1> 	inc	esi
  4190 0000879A 803E20              <1> 	cmp	byte [esi], 20h
  4191 0000879D 7409                <1>         je      short move_scan_destination_1
  4192                              <1> 	;jb	short loc_move_nofilename_retn
  4193 0000879F 0F825CECFFFF        <1> 	jb	loc_cmd_failed
  4194 000087A5 EBF2                <1> 	jmp	short move_scan_source_file
  4195                              <1> 
  4196                              <1> loc_move_nofilename_retn:
  4197 000087A7 C3                  <1> 	retn
  4198                              <1> 
  4199                              <1> move_scan_destination_1:
  4200 000087A8 C60600              <1> 	mov	byte [esi], 0
  4201                              <1> 
  4202                              <1> move_scan_destination_2:
  4203 000087AB 46                  <1> 	inc	esi  
  4204 000087AC 803E20              <1> 	cmp	byte [esi], 20h
  4205 000087AF 74FA                <1> 	je	short move_scan_destination_2
  4206                              <1> 	;jb	short loc_move_nofilename_retn
  4207 000087B1 0F824AECFFFF        <1> 	jb	loc_cmd_failed
  4208                              <1> 
  4209 000087B7 8935[543F0100]      <1> 	mov	[DestinationFilePath], esi
  4210                              <1> 
  4211                              <1> move_scan_destination_3:
  4212 000087BD 46                  <1> 	inc	esi  
  4213 000087BE 803E20              <1> 	cmp	byte [esi], 20h
  4214 000087C1 77FA                <1> 	ja	short move_scan_destination_3
  4215 000087C3 C60600              <1> 	mov	byte [esi], 0
  4216                              <1> 
  4217                              <1> loc_move_scan_destination_OK:
  4218 000087C6 8B35[503F0100]      <1> 	mov	esi, [SourceFilePath]
  4219 000087CC 8B3D[543F0100]      <1> 	mov	edi, [DestinationFilePath]
  4220                              <1> 
  4221 000087D2 B001                <1> 	mov	al, 1  ; move procedure Phase 1
  4222 000087D4 E8081C0000          <1> 	call	move_source_file_to_destination_file
  4223 000087D9 7328                <1> 	jnc	short move_source_file_to_destination_question
  4224                              <1> 
  4225                              <1> loc_move_cmd_failed_1:
  4226 000087DB 08C0                <1> 	or	al, al
  4227 000087DD 0F841EECFFFF        <1> 	jz	loc_cmd_failed 
  4228 000087E3 3C11                <1> 	cmp	al, 11h
  4229 000087E5 740D                <1> 	je	short loc_msg_not_same_device   
  4230 000087E7 3C05                <1> 	cmp	al, 05h
  4231 000087E9 0F853DECFFFF        <1> 	jne	loc_run_cmd_failed
  4232                              <1> 
  4233 000087EF 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 000087F4 BE[83F50000]        <1> 	mov	esi, msg_not_same_drv 
  4241 000087F9 E873D4FFFF          <1> 	call	print_msg
  4242 000087FE E930F5FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4243                              <1> 
  4244                              <1> move_source_file_to_destination_question:
  4245 00008803 A0[583F0100]        <1>         mov     al, [SourceFile_Drv]
  4246 00008808 0441                <1> 	add	al, 'A'
  4247 0000880A A2[E5F50000]        <1> 	mov	[msg_source_file_drv], al
  4248 0000880F A0[D83F0100]        <1>         mov     al, [DestinationFile_Drv]
  4249 00008814 0441                <1> 	add	al, 'A'
  4250 00008816 A2[04F60000]        <1> 	mov	[msg_destination_file_drv], al
  4251                              <1> 
  4252 0000881B 57                  <1> 	push	edi ; *
  4253                              <1> 
  4254 0000881C BE[C9F50000]        <1> 	mov	esi, msg_source_file
  4255 00008821 E84BD4FFFF          <1> 	call	print_msg
  4256 00008826 BE[593F0100]        <1> 	mov	esi, SourceFile_Directory
  4257 0000882B 803E20              <1> 	cmp	byte [esi], 20h
  4258 0000882E 7605                <1> 	jna	short msftdfq_sfn
  4259 00008830 E83CD4FFFF          <1> 	call	print_msg
  4260                              <1> msftdfq_sfn:
  4261 00008835 BE[9A3F0100]        <1> 	mov	esi, SourceFile_Name
  4262 0000883A E832D4FFFF          <1> 	call	print_msg
  4263 0000883F BE[E8F50000]        <1> 	mov	esi, msg_destination_file
  4264 00008844 E828D4FFFF          <1> 	call	print_msg
  4265 00008849 BE[D93F0100]        <1> 	mov	esi, DestinationFile_Directory
  4266 0000884E 803E20              <1> 	cmp	byte [esi], 20h
  4267 00008851 7605                <1> 	jna	short msftdfq_dfn
  4268 00008853 E819D4FFFF          <1> 	call	print_msg
  4269                              <1> msftdfq_dfn:
  4270 00008858 BE[1A400100]        <1> 	mov	esi, DestinationFile_Name
  4271 0000885D E80FD4FFFF          <1> 	call	print_msg
  4272 00008862 BE[07F60000]        <1> 	mov	esi, msg_copy_nextline
  4273 00008867 E805D4FFFF          <1> 	call	print_msg
  4274 0000886C BE[07F60000]        <1> 	mov	esi, msg_copy_nextline
  4275 00008871 E8FBD3FFFF          <1> 	call	print_msg
  4276                              <1> 
  4277                              <1> loc_move_ask_for_new_file_yes_no:
  4278 00008876 BE[95F50000]        <1> 	mov	esi, Msg_DoYouWantMoveFile
  4279 0000887B E8F1D3FFFF          <1> 	call	print_msg
  4280 00008880 BE[99F40000]        <1> 	mov	esi, Msg_YesNo
  4281 00008885 E8E7D3FFFF          <1> 	call	print_msg
  4282                              <1> loc_move_ask_for_new_file_again:
  4283 0000888A 30E4                <1> 	xor	ah, ah
  4284 0000888C E87683FFFF          <1> 	call	int16h
  4285 00008891 3C1B                <1> 	cmp	al, 1Bh
  4286                              <1> 	;je	short loc_do_not_move_file
  4287 00008893 744F                <1> 	je	short loc_move_y_n_escape
  4288 00008895 24DF                <1> 	and	al, 0DFh
  4289 00008897 A2[A3F40000]        <1>         mov     [Y_N_nextline], al
  4290 0000889C 3C59                <1> 	cmp	al, 'Y'
  4291 0000889E 7404                <1> 	je	short loc_yes_move_file
  4292 000088A0 3C4E                <1> 	cmp	al, 'N'
  4293 000088A2 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 000088A4 A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  4298 000088A9 6650                <1> 	push	ax
  4299 000088AB BE[A3F40000]        <1> 	mov	esi, Y_N_nextline
  4300 000088B0 E8BCD3FFFF          <1> 	call	print_msg
  4301 000088B5 6658                <1> 	pop	ax
  4302 000088B7 5F                  <1> 	pop	edi ; *
  4303                              <1> 	;cmp	al, 'Y' ; 'yes'
  4304                              <1> 	;cmc
  4305                              <1>         ;jnc	loc_file_rw_restore_retn
  4306 000088B8 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4307 000088BA 0F8473F4FFFF        <1>         je	loc_file_rw_restore_retn
  4308                              <1> 
  4309                              <1> loc_move_yes_move_file:
  4310 000088C0 B002                <1> 	mov	al, 2 ; move procedure Phase 2
  4311 000088C2 E81A1B0000          <1> 	call	move_source_file_to_destination_file
  4312                              <1> 	;jc	short loc_move_cmd_failed_2
  4313 000088C7 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 000088CD 3C27                <1> 	cmp	al, 27h
  4322 000088CF 0F8557EBFFFF        <1> 	jne	loc_run_cmd_failed
  4323                              <1> 
  4324 000088D5 BE[AEF50000]        <1> 	mov	esi, msg_insufficient_disk_space
  4325 000088DA E892D3FFFF          <1> 	call	print_msg
  4326                              <1> 
  4327 000088DF E94FF4FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4328                              <1> 
  4329                              <1> loc_move_y_n_escape:
  4330 000088E4 B04E                <1> 	mov	al, 'N' ; 'no'
  4331 000088E6 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 000088E8 803E20              <1> 	cmp	byte [esi], 20h
  4344 000088EB 7614                <1>         jna     short loc_copy_nofilename_retn
  4345                              <1> 
  4346 000088ED 8935[503F0100]      <1> 	mov	[SourceFilePath], esi
  4347                              <1> 
  4348                              <1> copy_scan_source_file:
  4349 000088F3 46                  <1> 	inc	esi  
  4350 000088F4 803E20              <1> 	cmp	byte [esi], 20h
  4351 000088F7 7409                <1> 	je	short copy_scan_destination_1
  4352                              <1> 	;jb	short loc_copy_nofilename_retn
  4353 000088F9 0F8202EBFFFF        <1> 	jb	loc_cmd_failed
  4354 000088FF EBF2                <1> 	jmp	short copy_scan_source_file
  4355                              <1> 
  4356                              <1> loc_copy_nofilename_retn:
  4357 00008901 C3                  <1> 	retn
  4358                              <1> 
  4359                              <1> copy_scan_destination_1:
  4360 00008902 C60600              <1> 	mov	byte [esi], 0
  4361                              <1> 
  4362                              <1> copy_scan_destination_2:
  4363 00008905 46                  <1> 	inc	esi  
  4364 00008906 803E20              <1> 	cmp	byte [esi], 20h
  4365 00008909 74FA                <1> 	je	short copy_scan_destination_2
  4366                              <1> 	;jb	short loc_copy_nofilename_retn
  4367 0000890B 0F82F0EAFFFF        <1> 	jb	loc_cmd_failed
  4368                              <1> 
  4369 00008911 8935[543F0100]      <1> 	mov	[DestinationFilePath], esi
  4370                              <1> 
  4371                              <1> copy_scan_destination_3:
  4372 00008917 46                  <1> 	inc	esi  
  4373 00008918 803E20              <1> 	cmp	byte [esi], 20h
  4374 0000891B 77FA                <1> 	ja	short copy_scan_destination_3
  4375 0000891D C60600              <1> 	mov	byte [esi], 0
  4376                              <1> 
  4377                              <1> loc_copy_save_current_drive:
  4378 00008920 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  4379 00008926 8835[CE3C0100]      <1> 	mov	[RUN_CDRV], dh
  4380                              <1> 
  4381                              <1> copy_source_file_to_destination_phase_1:
  4382 0000892C 8B35[503F0100]      <1> 	mov	esi, [SourceFilePath]
  4383 00008932 8B3D[543F0100]      <1> 	mov	edi, [DestinationFilePath]
  4384                              <1> 
  4385 00008938 B001                <1> 	mov	al, 1  ; copy procedure Phase 1
  4386 0000893A E83F1D0000          <1> 	call	copy_source_file_to_destination_file
  4387 0000893F 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 00008941 08C0                <1> 	or	al, al
  4392 00008943 7507                <1> 	jnz	short loc_copy_cmd_failed_2
  4393                              <1> 
  4394 00008945 FEC0                <1>         inc     al ; mov al, 1 ; Bad command or file name !
  4395 00008947 E9E0EAFFFF          <1> 	jmp	loc_run_cmd_failed
  4396                              <1> 
  4397                              <1> loc_copy_cmd_failed_2:
  4398 0000894C 3C27                <1> 	cmp	al, 27h ; Insufficient disk space 
  4399 0000894E 740D                <1> 	je	short loc_file_write_insuff_disk_space_msg
  4400                              <1>  
  4401 00008950 3C05                <1> 	cmp	al, 05h
  4402 00008952 0F85D4EAFFFF        <1> 	jne	loc_run_cmd_failed
  4403                              <1> 	
  4404 00008958 E9E0F3FFFF          <1> 	jmp	loc_permission_denied
  4405                              <1> 
  4406                              <1> loc_file_write_insuff_disk_space_msg:
  4407 0000895D BE[AEF50000]        <1> 	mov	esi, msg_insufficient_disk_space
  4408 00008962 E80AD3FFFF          <1> 	call	print_msg
  4409 00008967 E9C7F3FFFF          <1>         jmp     loc_file_rw_restore_retn 
  4410                              <1> 
  4411                              <1> copy_source_file_to_destination_question:
  4412 0000896C 57                  <1> 	push	edi ; *
  4413                              <1> 
  4414                              <1> 	; dh = source file attributes
  4415                              <1> 	; dl > 0 -> destination file found
  4416 0000896D 20D2                <1> 	and	dl, dl            
  4417 0000896F 7449                <1> 	jz	short copy_source_file_to_destination_pass_owrq
  4418                              <1> 
  4419                              <1> loc_copy_ask_for_owr_yes_no:
  4420 00008971 BE[0AF60000]        <1> 	mov	esi, Msg_DoYouWantOverWriteFile
  4421 00008976 E8F6D2FFFF          <1> 	call	print_msg
  4422 0000897B BE[1A400100]        <1> 	mov	esi, DestinationFile_Name
  4423 00008980 E8ECD2FFFF          <1> 	call	print_msg
  4424 00008985 BE[99F40000]        <1> 	mov	esi, Msg_YesNo
  4425 0000898A E8E2D2FFFF          <1> 	call	print_msg
  4426                              <1> 
  4427                              <1> loc_copy_ask_for_owr_again:
  4428 0000898F 30E4                <1> 	xor	ah, ah
  4429 00008991 E87182FFFF          <1> 	call	int16h
  4430 00008996 3C1B                <1> 	cmp	al, 1Bh
  4431                              <1>         ;je     loc_do_not_copy_file
  4432 00008998 7419                <1>         je      short loc_copy_y_n_escape
  4433 0000899A 24DF                <1> 	and	al, 0DFh
  4434 0000899C A2[A3F40000]        <1>         mov     [Y_N_nextline], al
  4435 000089A1 3C59                <1> 	cmp	al, 'Y'
  4436 000089A3 0F84B1000000        <1>         je      loc_yes_copy_file
  4437 000089A9 3C4E                <1> 	cmp	al, 'N'
  4438 000089AB 0F84A9000000        <1>         je      loc_do_not_copy_file
  4439 000089B1 EBDC                <1> 	jmp	short loc_copy_ask_for_owr_again
  4440                              <1> 
  4441                              <1> loc_copy_y_n_escape:
  4442 000089B3 B04E                <1> 	mov	al, 'N' ; 'no'
  4443 000089B5 E9A0000000          <1>         jmp     loc_do_not_copy_file
  4444                              <1> 
  4445                              <1> copy_source_file_to_destination_pass_owrq:
  4446 000089BA A0[583F0100]        <1> 	mov     al, [SourceFile_Drv]
  4447 000089BF 0441                <1> 	add	al, 'A'
  4448 000089C1 A2[E5F50000]        <1> 	mov	[msg_source_file_drv], al
  4449 000089C6 A0[D83F0100]        <1>         mov     al, [DestinationFile_Drv]
  4450 000089CB 0441                <1> 	add	al, 'A'
  4451 000089CD A2[04F60000]        <1> 	mov	[msg_destination_file_drv], al
  4452                              <1> 
  4453 000089D2 BE[C9F50000]        <1> 	mov	esi, msg_source_file
  4454 000089D7 E895D2FFFF          <1> 	call	print_msg
  4455 000089DC BE[593F0100]        <1> 	mov	esi, SourceFile_Directory
  4456 000089E1 803E20              <1> 	cmp	byte [esi], 20h
  4457 000089E4 7605                <1> 	jna	short csftdfq_sfn
  4458 000089E6 E886D2FFFF          <1> 	call	print_msg
  4459                              <1> csftdfq_sfn:
  4460 000089EB BE[9A3F0100]        <1> 	mov	esi, SourceFile_Name
  4461 000089F0 E87CD2FFFF          <1> 	call	print_msg
  4462 000089F5 BE[E8F50000]        <1> 	mov	esi, msg_destination_file
  4463 000089FA E872D2FFFF          <1> 	call	print_msg
  4464 000089FF BE[D93F0100]        <1> 	mov	esi, DestinationFile_Directory
  4465 00008A04 803E20              <1> 	cmp	byte [esi], 20h
  4466 00008A07 7605                <1> 	jna	short csftdfq_dfn
  4467 00008A09 E863D2FFFF          <1> 	call	print_msg
  4468                              <1> csftdfq_dfn:
  4469 00008A0E BE[1A400100]        <1> 	mov	esi, DestinationFile_Name
  4470 00008A13 E859D2FFFF          <1> 	call	print_msg
  4471 00008A18 BE[07F60000]        <1> 	mov	esi, msg_copy_nextline
  4472 00008A1D E84FD2FFFF          <1> 	call	print_msg
  4473 00008A22 BE[07F60000]        <1> 	mov	esi, msg_copy_nextline
  4474 00008A27 E845D2FFFF          <1> 	call	print_msg
  4475                              <1> 
  4476                              <1> loc_copy_ask_for_new_file_yes_no:
  4477 00008A2C BE[29F60000]        <1> 	mov	esi, Msg_DoYouWantCopyFile
  4478 00008A31 E83BD2FFFF          <1> 	call	print_msg
  4479 00008A36 BE[99F40000]        <1> 	mov	esi, Msg_YesNo
  4480 00008A3B E831D2FFFF          <1> 	call	print_msg
  4481                              <1> 
  4482                              <1> loc_copy_ask_for_new_file_again:
  4483 00008A40 30E4                <1> 	xor	ah, ah
  4484 00008A42 E8C081FFFF          <1> 	call	int16h
  4485 00008A47 3C1B                <1> 	cmp	al, 1Bh
  4486 00008A49 740F                <1> 	je	short loc_do_not_copy_file
  4487 00008A4B 24DF                <1> 	and	al, 0DFh
  4488 00008A4D A2[A3F40000]        <1>         mov     [Y_N_nextline], al
  4489 00008A52 3C59                <1> 	cmp	al, 'Y'
  4490 00008A54 7404                <1> 	je	short loc_yes_copy_file
  4491 00008A56 3C4E                <1> 	cmp	al, 'N'
  4492 00008A58 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 00008A5A A2[A3F40000]        <1> 	mov	[Y_N_nextline], al
  4497 00008A5F 6650                <1> 	push	ax
  4498 00008A61 BE[A3F40000]        <1> 	mov	esi, Y_N_nextline
  4499 00008A66 E806D2FFFF          <1> 	call	print_msg
  4500 00008A6B 6658                <1> 	pop	ax
  4501 00008A6D 5F                  <1> 	pop	edi ; *
  4502                              <1> 	;cmp	al, 'Y' ; 'yes'
  4503                              <1> 	;cmc
  4504                              <1>         ;jnc	loc_file_rw_restore_retn
  4505 00008A6E 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4506 00008A70 0F84BDF2FFFF        <1>         je	loc_file_rw_restore_retn
  4507                              <1> 
  4508                              <1> copy_source_file_to_destination_pass_q:
  4509 00008A76 B002                <1> 	mov	al, 2  ; copy procedure Phase 2
  4510 00008A78 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 00008A7D 6651                <1> 	push	cx
  4515 00008A7F BE[07F60000]        <1> 	mov	esi, msg_copy_nextline
  4516 00008A84 E8E8D1FFFF          <1> 	call	print_msg
  4517                              <1> 	;pop	cx
  4518 00008A89 6658                <1> 	pop	ax
  4519                              <1> 
  4520                              <1> 	;or	cl, cl
  4521 00008A8B 08C0                <1> 	or	al, al
  4522 00008A8D 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 00008A8F 3C12                <1> 	cmp	al, 18
  4528 00008A91 7506                <1> 	jne	short copy_source_file_to_destination_not_OK
  4529                              <1> 	;
  4530                              <1> 	;mov	al, cl ; error number (write fault!)
  4531 00008A93 F9                  <1> 	stc
  4532 00008A94 E99AF2FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4533                              <1> 
  4534                              <1> copy_source_file_to_destination_not_OK:
  4535 00008A99 BE[42F60000]        <1> 	mov	esi, Msg_read_file_error_before_EOF
  4536 00008A9E E8CED1FFFF          <1> 	call	print_msg
  4537 00008AA3 E98BF2FFFF          <1> 	jmp	loc_file_rw_restore_retn	      
  4538                              <1>  
  4539                              <1> copy_source_file_to_destination_OK:
  4540 00008AA8 BE[A7F40000]        <1> 	mov	esi, Msg_OK
  4541 00008AAD E8BFD1FFFF          <1> 	call	print_msg
  4542                              <1> 
  4543 00008AB2 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 00008AB7 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 00008AB8 8A06                <1> 	mov	al, [esi]
  4571 00008ABA 3C20                <1> 	cmp	al, 20h
  4572 00008ABC 771E                <1> 	ja	short loc_find_env
  4573                              <1> 
  4574 00008ABE BE00300900          <1> 	mov	esi, Env_Page
  4575                              <1> loc_print_setline:
  4576 00008AC3 803E00              <1> 	cmp	byte [esi], 0
  4577 00008AC6 7613                <1> 	jna	short loc_setenv_retn
  4578 00008AC8 E8A4D1FFFF          <1> 	call	print_msg
  4579 00008ACD 56                  <1> 	push	esi
  4580 00008ACE BE[97020100]        <1> 	mov	esi, nextline
  4581 00008AD3 E899D1FFFF          <1> 	call	print_msg 
  4582 00008AD8 5E                  <1> 	pop	esi
  4583 00008AD9 EBE8                <1> 	jmp	short loc_print_setline   
  4584                              <1> 
  4585                              <1> loc_setenv_retn: 
  4586 00008ADB C3                  <1> 	retn
  4587                              <1> 
  4588                              <1> loc_find_env:
  4589 00008ADC 3C3D                <1> 	cmp	al, '='
  4590 00008ADE 0F841DE9FFFF        <1> 	je	loc_cmd_failed
  4591                              <1> 
  4592 00008AE4 56                  <1> 	push	esi
  4593                              <1> loc_repeat_env_equal_check:
  4594 00008AE5 46                  <1> 	inc	esi
  4595 00008AE6 803E3D              <1> 	cmp	byte [esi], '='
  4596 00008AE9 7431                <1> 	je	short pass_env_equal_check
  4597 00008AEB 803E20              <1> 	cmp	byte [esi], 20h
  4598 00008AEE 73F5                <1> 	jnb	short loc_repeat_env_equal_check
  4599 00008AF0 C60600              <1> 	mov	byte [esi], 0 
  4600 00008AF3 5E                  <1> 	pop	esi
  4601 00008AF4 BF[6E350100]        <1> 	mov	edi, TextBuffer ; out buffer
  4602 00008AF9 B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4603 00008AFE 30C0                <1> 	xor	al, al ; 0 -> use [ESI]
  4604 00008B00 E89E000000          <1> 	call	get_environment_string
  4605 00008B05 72D4                <1> 	jc	short loc_setenv_retn
  4606                              <1> 
  4607 00008B07 BE[6E350100]        <1> 	mov	esi, TextBuffer
  4608 00008B0C E860D1FFFF          <1> 	call	print_msg
  4609 00008B11 BE[97020100]        <1> 	mov	esi, nextline
  4610 00008B16 E856D1FFFF          <1> 	call	print_msg
  4611                              <1> 
  4612 00008B1B C3                  <1> 	retn 
  4613                              <1>               
  4614                              <1> pass_env_equal_check:
  4615 00008B1C 46                  <1> 	inc	esi
  4616 00008B1D 803E20              <1> 	cmp	byte [esi], 20h
  4617 00008B20 73FA                <1> 	jnb	short pass_env_equal_check
  4618 00008B22 C60600              <1> 	mov	byte [esi], 0	
  4619                              <1> 
  4620                              <1> loc_call_set_env_string:
  4621 00008B25 5E                  <1> 	pop	esi
  4622 00008B26 E83B010000          <1> 	call	set_environment_string
  4623 00008B2B 73AE                <1> 	jnc	short loc_setenv_retn
  4624                              <1> 
  4625                              <1> loc_set_cmd_failed:
  4626 00008B2D 3C08                <1> 	cmp	al, 08h
  4627 00008B2F 0F85CCE8FFFF        <1> 	jne	loc_cmd_failed
  4628                              <1> 
  4629 00008B35 BE[82F60000]        <1> 	mov	esi, Msg_No_Set_Space
  4630 00008B3A E832D1FFFF          <1> 	call	print_msg
  4631                              <1> 
  4632 00008B3F 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 00008B40 803E20              <1> 	cmp	byte [esi], 20h
  4641 00008B43 7737                <1> 	ja	short loc_set_path
  4642                              <1> 
  4643 00008B45 BE00300900          <1> 	mov	esi, Env_Page
  4644                              <1> loc_print_path:
  4645 00008B4A 803E00              <1> 	cmp	byte [esi], 0
  4646 00008B4D 762C                <1> 	jna	short loc_path_retn
  4647                              <1> 
  4648 00008B4F BE[E1F00000]        <1> 	mov	esi, Cmd_Path ; 'PATH' address
  4649 00008B54 BF[6E350100]        <1> 	mov	edi, TextBuffer ; oout buffer
  4650 00008B59 30C0                <1> 	xor	al, al  ; use [ESI]
  4651 00008B5B B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4652 00008B60 E83E000000          <1> 	call	get_environment_string
  4653 00008B65 7214                <1> 	jc	short loc_path_retn
  4654                              <1> 
  4655 00008B67 BE[6E350100]        <1> 	mov	esi, TextBuffer
  4656 00008B6C E800D1FFFF          <1> 	call	print_msg
  4657 00008B71 BE[97020100]        <1> 	mov	esi, nextline
  4658 00008B76 E8F6D0FFFF          <1> 	call	print_msg   
  4659                              <1> 
  4660                              <1> loc_path_retn: 
  4661 00008B7B C3                  <1> 	retn
  4662                              <1> 
  4663                              <1> loc_set_path:
  4664 00008B7C 56                  <1> 	push	esi 
  4665                              <1> loc_set_path_find_end:
  4666 00008B7D 46                  <1> 	inc	esi
  4667 00008B7E 803E20              <1> 	cmp	byte [esi], 20h
  4668 00008B81 73FA                <1> 	jnb	short loc_set_path_find_end
  4669 00008B83 C60600              <1> 	mov	byte [esi], 0 
  4670                              <1> loc_set_path_header: 
  4671 00008B86 5E                  <1> 	pop	esi	  
  4672 00008B87 4E                  <1> 	dec	esi
  4673 00008B88 C6063D              <1> 	mov	byte [esi], '='
  4674 00008B8B 4E                  <1> 	dec	esi
  4675 00008B8C C60648              <1> 	mov	byte [esi], 'H'
  4676 00008B8F 4E                  <1> 	dec	esi
  4677 00008B90 C60654              <1> 	mov	byte [esi], 'T'
  4678 00008B93 4E                  <1> 	dec	esi
  4679 00008B94 C60641              <1> 	mov	byte [esi], 'A'
  4680 00008B97 4E                  <1> 	dec	esi
  4681 00008B98 C60650              <1> 	mov	byte [esi], 'P'   
  4682                              <1> 
  4683                              <1> loc_path_call_set_env_string:
  4684 00008B9B E8C6000000          <1> 	call	set_environment_string
  4685 00008BA0 728B                <1>         jc	short loc_set_cmd_failed
  4686                              <1> 
  4687 00008BA2 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 00008BA3 BA00300900          <1> 	mov	edx, Env_Page
  4712 00008BA8 803A00              <1> 	cmp	byte [edx], 0
  4713 00008BAB 7474                <1> 	jz	short get_env_string_with_word_stc_retn
  4714                              <1> 
  4715 00008BAD 66890D[DC400100]    <1> 	mov	[env_var_length], cx
  4716                              <1> 
  4717 00008BB4 51                  <1> 	push	ecx ; *
  4718 00008BB5 56                  <1> 	push	esi ; **
  4719                              <1> 
  4720 00008BB6 08C0                <1> 	or	al, al
  4721 00008BB8 7449                <1> 	jz	short get_env_string_with_word
  4722                              <1> 
  4723                              <1> get_env_string_with_seq_number:
  4724 00008BBA B101                <1> 	mov	cl, 1
  4725 00008BBC 88C5                <1> 	mov	ch, al
  4726 00008BBE 31C0                <1> 	xor	eax, eax
  4727 00008BC0 89D6                <1> 	mov	esi, edx ; Env_Page
  4728                              <1> 
  4729                              <1> get_env_string_seq_number_check:
  4730 00008BC2 38CD                <1> 	cmp	ch, cl
  4731 00008BC4 7726                <1> 	ja	short get_env_string_seq_number_next
  4732                              <1> 
  4733                              <1> get_env_string_move_to_buff:
  4734 00008BC6 57                  <1> 	push	edi ; ***
  4735                              <1> 
  4736 00008BC7 29D2                <1> 	sub	edx, edx
  4737                              <1> 
  4738                              <1> get_env_string_seq_number_repeat1:
  4739 00008BC9 42                  <1> 	inc	edx
  4740 00008BCA AC                  <1> 	lodsb
  4741 00008BCB AA                  <1> 	stosb
  4742                              <1> 
  4743 00008BCC 66FF0D[DC400100]    <1> 	dec	word [env_var_length]
  4744 00008BD3 7508                <1> 	jnz	short get_env_string_seq_number_repeat3
  4745                              <1> 
  4746                              <1> get_env_string_seq_number_repeat2:
  4747 00008BD5 20C0                <1> 	and	al, al
  4748 00008BD7 7408                <1> 	jz	short get_env_string_seq_number_ok
  4749 00008BD9 42                  <1> 	inc	edx
  4750 00008BDA AC                  <1> 	lodsb
  4751 00008BDB EBF8                <1> 	jmp	short get_env_string_seq_number_repeat2
  4752                              <1> 
  4753                              <1> get_env_string_seq_number_repeat3:
  4754 00008BDD 08C0                <1> 	or	al, al
  4755 00008BDF 75E8                <1> 	jnz	short get_env_string_seq_number_repeat1
  4756                              <1> 
  4757                              <1> get_env_string_seq_number_ok:
  4758 00008BE1 5F                  <1> 	pop	edi ; ***
  4759 00008BE2 89D0                <1> 	mov	eax, edx ; Length of the environment string
  4760                              <1> 			 ; (ASCIIZ, includes ZERO tail)
  4761 00008BE4 BA00300900          <1> 	mov	edx, Env_Page
  4762                              <1> 
  4763                              <1> get_env_string_stc_retn:
  4764 00008BE9 5E                  <1> 	pop	esi ; **
  4765 00008BEA 59                  <1> 	pop	ecx ; *
  4766 00008BEB C3                  <1> 	retn   
  4767                              <1> 	
  4768                              <1> get_env_string_seq_number_next:
  4769 00008BEC AC                  <1> 	lodsb
  4770 00008BED 08C0                <1> 	or	al, al
  4771 00008BEF 75FB                <1> 	jnz	short get_env_string_seq_number_next
  4772                              <1> 
  4773 00008BF1 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; +512 (+4096)
  4774 00008BF7 F5                  <1> 	cmc
  4775 00008BF8 72EF                <1> 	jc	short get_env_string_stc_retn
  4776                              <1> 
  4777 00008BFA AC                  <1> 	lodsb
  4778 00008BFB 3C01                <1> 	cmp	al, 1
  4779 00008BFD 72EA                <1> 	jb	short get_env_string_stc_retn
  4780 00008BFF FEC1                <1> 	inc	cl
  4781 00008C01 EBBF                <1> 	jmp	short get_env_string_seq_number_check
  4782                              <1> 
  4783                              <1> get_env_string_with_word:
  4784 00008C03 31C9                <1> 	xor	ecx, ecx
  4785                              <1> 
  4786                              <1> get_env_string_calc_word_length:
  4787 00008C05 AC                  <1> 	lodsb 
  4788 00008C06 3C20                <1> 	cmp	al, 20h
  4789 00008C08 7211                <1> 	jb	short get_env_string_calc_word_length_ok
  4790                              <1> 	;inc	cx
  4791 00008C0A FEC1                <1> 	inc	cl
  4792                              <1> 
  4793 00008C0C 3C61                <1> 	cmp	al, 'a'
  4794 00008C0E 72F5                <1> 	jb	short get_env_string_calc_word_length
  4795 00008C10 3C7A                <1> 	cmp	al, 'z'
  4796 00008C12 77F1                <1> 	ja	short get_env_string_calc_word_length
  4797 00008C14 24DF                <1> 	and	al, 0DFh
  4798 00008C16 8846FF              <1> 	mov	[esi-1], al
  4799 00008C19 EBEA                <1> 	jmp	short get_env_string_calc_word_length
  4800                              <1> 	
  4801                              <1> get_env_string_calc_word_length_ok:
  4802 00008C1B 08C9                <1> 	or	cl, cl
  4803 00008C1D 7506                <1> 	jnz	short get_env_string_calc_word_length_save
  4804                              <1>      
  4805 00008C1F 5E                  <1> 	pop	esi ; **
  4806                              <1> 
  4807                              <1> get_env_string_stc_retn1:
  4808 00008C20 59                  <1> 	pop	ecx ; *
  4809                              <1>         
  4810                              <1> get_env_string_with_word_stc_retn:
  4811 00008C21 31C0                <1> 	xor	eax, eax  
  4812 00008C23 F9                  <1> 	stc
  4813 00008C24 C3                  <1> 	retn
  4814                              <1>   
  4815                              <1> get_env_string_calc_word_length_save:
  4816 00008C25 871C24              <1> 	xchg	ebx, [esp] ; **
  4817 00008C28 89DE                <1> 	mov	esi, ebx 
  4818                              <1> 		; Start of the env string (to be searched)
  4819                              <1> 
  4820 00008C2A 57                  <1> 	push	edi ; ***
  4821 00008C2B 89D7                <1> 	mov	edi, edx ; Env_Page
  4822                              <1> 
  4823                              <1> get_env_string_compare:
  4824 00008C2D 57                  <1> 	push	edi ; ****
  4825 00008C2E 51                  <1> 	push	ecx ; ***** ; Variable name length
  4826                              <1> 
  4827                              <1> get_env_string_compare_rep:
  4828 00008C2F AC                  <1> 	lodsb
  4829 00008C30 AE                  <1> 	scasb
  4830 00008C31 7511                <1> 	jne	short get_env_string_compare_next1
  4831 00008C33 E2FA                <1> 	loop	get_env_string_compare_rep
  4832                              <1> 	
  4833 00008C35 803F3D              <1> 	cmp	byte [edi], '='
  4834 00008C38 750A                <1> 	jne	short get_env_string_compare_next1
  4835                              <1>  
  4836 00008C3A 59                  <1> 	pop	ecx ; *****
  4837 00008C3B 5F                  <1> 	pop	edi ; ****
  4838 00008C3C 89FE                <1> 	mov	esi, edi
  4839 00008C3E 5F                  <1> 	pop	edi ; ***
  4840 00008C3F 871C24              <1> 	xchg	ebx, [esp] ; **
  4841 00008C42 EB82                <1> 	jmp	short get_env_string_move_to_buff
  4842                              <1> 
  4843                              <1> get_env_string_compare_next1:
  4844 00008C44 89FE                <1> 	mov	esi, edi
  4845 00008C46 59                  <1> 	pop	ecx ; *****
  4846 00008C47 5F                  <1> 	pop	edi ; ****
  4847                              <1> get_env_string_compare_next2:
  4848 00008C48 81FEFF310900        <1> 	cmp	esi, Env_Page + Env_Page_Size - 1 ; +511 (+4095)
  4849 00008C4E 7310                <1> 	jnb	short get_env_string_compare_not_ok
  4850 00008C50 20C0                <1> 	and	al, al
  4851 00008C52 AC                  <1> 	lodsb
  4852 00008C53 75F3                <1> 	jnz	short get_env_string_compare_next2
  4853 00008C55 08C0                <1> 	or	al, al
  4854 00008C57 7407                <1> 	jz	short get_env_string_compare_not_ok
  4855 00008C59 4E                  <1> 	dec	esi ; 12/04/2016
  4856 00008C5A 89F7                <1> 	mov	edi, esi
  4857 00008C5C 89DE                <1> 	mov	esi, ebx
  4858 00008C5E EBCD                <1> 	jmp	short get_env_string_compare
  4859                              <1> 
  4860                              <1> get_env_string_compare_not_ok:
  4861 00008C60 5F                  <1> 	pop	edi ; ***
  4862 00008C61 89DE                <1> 	mov	esi, ebx
  4863 00008C63 5B                  <1> 	pop	ebx ; **
  4864 00008C64 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 00008C66 56                  <1> 	push 	esi ; *
  4888                              <1> 
  4889 00008C67 31C0                <1> 	xor	eax, eax
  4890                              <1> 
  4891                              <1> set_env_chk_validation1:
  4892 00008C69 FEC4                <1> 	inc	ah ; variable (string) length
  4893 00008C6B AC                  <1> 	lodsb
  4894 00008C6C 3C3D                <1> 	cmp	al, '='
  4895 00008C6E 7415                <1> 	je	short set_env_chk_validation2
  4896 00008C70 3C20                <1> 	cmp	al, 20h
  4897 00008C72 720F                <1> 	jb	short set_env_string_stc
  4898                              <1> 
  4899                              <1> 	; 06/04/2016
  4900 00008C74 3C61                <1> 	cmp	al, 'a'
  4901 00008C76 72F1                <1> 	jb	short set_env_chk_validation1
  4902 00008C78 3C7A                <1> 	cmp	al, 'z'
  4903 00008C7A 77ED                <1> 	ja	short set_env_chk_validation1
  4904 00008C7C 2C20                <1> 	sub	al, 'a'-'A'
  4905 00008C7E 8846FF              <1> 	mov	[esi-1], al
  4906 00008C81 EBE6                <1> 	jmp	short set_env_chk_validation1
  4907                              <1> 
  4908                              <1> set_env_string_stc:
  4909 00008C83 5E                  <1> 	pop	esi ; *
  4910                              <1> 	;stc
  4911 00008C84 C3                  <1> 	retn 
  4912                              <1> 	   
  4913                              <1> set_env_chk_validation2:
  4914 00008C85 51                  <1> 	push	ecx ; **
  4915 00008C86 53                  <1> 	push	ebx ; *** 
  4916 00008C87 57                  <1> 	push	edi ; ****
  4917                              <1> 
  4918                              <1> 	; 12/04/2016
  4919 00008C88 8B5C240C            <1> 	mov	ebx, [esp+12]
  4920                              <1> 
  4921                              <1> set_env_chk_validation2w:
  4922 00008C8C 89F7                <1> 	mov	edi, esi
  4923 00008C8E 4F                  <1> 	dec	edi
  4924                              <1> 
  4925 00008C8F 807FFF20            <1> 	cmp	byte [edi-1], 20h
  4926 00008C93 771A                <1> 	ja	short set_env_chk_validation2z
  4927                              <1> 	
  4928 00008C95 56                  <1> 	push	esi
  4929 00008C96 89FE                <1> 	mov	esi, edi
  4930 00008C98 4E                  <1> 	dec	esi
  4931                              <1> 
  4932                              <1> set_env_chk_validation2x:
  4933 00008C99 4E                  <1> 	dec	esi
  4934                              <1> 
  4935 00008C9A 39DE                <1> 	cmp	esi, ebx
  4936 00008C9C 7207                <1> 	jb	short set_env_chk_validation2y
  4937                              <1> 
  4938 00008C9E 4F                  <1> 	dec	edi
  4939                              <1> 
  4940 00008C9F 8A06                <1> 	mov	al, [esi]
  4941 00008CA1 8807                <1> 	mov	[edi], al
  4942                              <1> 
  4943 00008CA3 EBF4                <1> 	jmp	short set_env_chk_validation2x
  4944                              <1> 
  4945                              <1> set_env_chk_validation2y:
  4946 00008CA5 5E                  <1> 	pop	esi
  4947                              <1> 
  4948                              <1> 	;mov	byte [ebx], 20h
  4949                              <1> 	
  4950 00008CA6 43                  <1> 	inc 	ebx
  4951 00008CA7 895C240C            <1> 	mov	[esp+12], ebx
  4952                              <1> 
  4953 00008CAB FECC                <1> 	dec 	ah ; 13/04/2016
  4954                              <1> 
  4955 00008CAD EBDD                <1> 	jmp	short set_env_chk_validation2w
  4956                              <1> 	
  4957                              <1> set_env_chk_validation2z:	
  4958 00008CAF BA00300900          <1> 	mov	edx, Env_Page
  4959 00008CB4 89D7                <1> 	mov	edi, edx
  4960                              <1> 
  4961                              <1> set_env_chk_validation3:
  4962 00008CB6 AC                  <1> 	lodsb
  4963 00008CB7 3C20                <1> 	cmp	al, 20h
  4964 00008CB9 74FB                <1> 	je	short set_env_chk_validation3
  4965                              <1> 
  4966 00008CBB 9C                  <1> 	pushf
  4967                              <1> 
  4968                              <1> 	; 12/04/2016
  4969                              <1> set_env_chk_validation3n:
  4970 00008CBC 3C61                <1> 	cmp	al, 'a'
  4971 00008CBE 720C                <1> 	jb	short set_env_chk_validation3c
  4972 00008CC0 3C7A                <1> 	cmp	al, 'z'
  4973 00008CC2 7705                <1> 	ja	short set_env_chk_validation3x
  4974 00008CC4 2C20                <1> 	sub	al, 'a'-'A'
  4975 00008CC6 8846FF              <1> 	mov	[esi-1], al
  4976                              <1> 
  4977                              <1> set_env_chk_validation3x:
  4978 00008CC9 AC                  <1> 	lodsb
  4979 00008CCA EBF0                <1> 	jmp	short set_env_chk_validation3n
  4980                              <1> 
  4981                              <1> set_env_chk_validation3c:
  4982 00008CCC 3C20                <1> 	cmp	al, 20h
  4983 00008CCE 73F9                <1> 	jnb	short set_env_chk_validation3x
  4984                              <1> 		
  4985 00008CD0 803F00              <1> 	cmp	byte [edi], 0
  4986 00008CD3 7731                <1> 	ja	short set_env_chk_validation4
  4987                              <1> 
  4988 00008CD5 9D                  <1> 	popf
  4989 00008CD6 7228                <1> 	jb	short set_env_string_nothing
  4990                              <1> 
  4991 00008CD8 B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)
  4992                              <1> 
  4993 00008CDD 89DE                <1> 	mov	esi, ebx ; 12/04/2016
  4994                              <1> 
  4995                              <1> set_env_string_copy_to_envb:
  4996 00008CDF AC                  <1> 	lodsb
  4997 00008CE0 3C20                <1> 	cmp	al, 20h
  4998 00008CE2 720A                <1> 	jb	short set_env_string_copy_to_envb_z
  4999 00008CE4 AA                  <1> 	stosb
  5000 00008CE5 E2F8                <1> 	loop	set_env_string_copy_to_envb
  5001                              <1> 
  5002                              <1> 	; 11/04/2016
  5003 00008CE7 89D7                <1> 	mov	edi, edx ; Env_Page
  5004 00008CE9 B900020000          <1> 	mov	ecx, Env_Page_Size 
  5005                              <1> 
  5006                              <1> set_env_string_copy_to_envb_z:
  5007 00008CEE 52                  <1> 	push	edx  ; Start address of the variable
  5008 00008CEF BA00020000          <1> 	mov	edx, Env_Page_Size
  5009 00008CF4 29CA                <1> 	sub	edx, ecx ; variable (string) length
  5010                              <1> 
  5011 00008CF6 28C0                <1> 	sub	al, al ; 0
  5012 00008CF8 F3AA                <1>  	rep	stosb ; clear remain bytes of the env page
  5013                              <1> 
  5014 00008CFA 58                  <1> 	pop	eax  ; Start address of the variable
  5015                              <1> 
  5016                              <1> set_env_string_allocate_envb_retn:  ; stc or clc return
  5017 00008CFB 5F                  <1> 	pop	edi ; ****
  5018 00008CFC 5B                  <1> 	pop	ebx ; ***
  5019 00008CFD 59                  <1> 	pop	ecx ; **
  5020 00008CFE 5E                  <1> 	pop	esi ; *	
  5021 00008CFF C3                  <1> 	retn
  5022                              <1> 
  5023                              <1> set_env_string_nothing:
  5024 00008D00 31C0                <1> 	xor	eax, eax
  5025 00008D02 31D2                <1> 	xor	edx, edx ; 11/04/2016
  5026 00008D04 EBF5                <1> 	jmp	short set_env_string_allocate_envb_retn
  5027                              <1> 
  5028                              <1> set_env_chk_validation4:
  5029                              <1> 	; 11/04/2016
  5030 00008D06 9D                  <1> 	popf
  5031                              <1> 
  5032 00008D07 89D6                <1> 	mov	esi, edx  ; Env_Page
  5033                              <1> 
  5034                              <1> set_env_chk_validation5:	
  5035 00008D09 89DF                <1> 	mov	edi, ebx  ; ASCIIZ environment string address	
  5036 00008D0B 0FB6CC              <1> 	movzx	ecx, ah ; Variable (string) length (with '=')
  5037                              <1> 
  5038                              <1> set_env_chk_validation5_loop:
  5039 00008D0E AC                  <1> 	lodsb
  5040 00008D0F AE                  <1> 	scasb
  5041 00008D10 750A                <1> 	jne	short set_env_chk_validation6
  5042 00008D12 E2FA                <1> 	loop	set_env_chk_validation5_loop
  5043                              <1> 
  5044 00008D14 3C3D                <1> 	cmp	al, '='
  5045 00008D16 0F8483000000        <1>         je      set_env_change_variable
  5046                              <1> 
  5047                              <1> set_env_chk_validation6:
  5048 00008D1C 08C0                <1> 	or	al, al ; 0
  5049 00008D1E 7403                <1> 	jz	short set_env_chk_validation7
  5050                              <1> 
  5051 00008D20 AC                  <1> 	lodsb
  5052 00008D21 EBF9                <1> 	jmp	short set_env_chk_validation6
  5053                              <1> 
  5054                              <1> set_env_chk_validation7:
  5055 00008D23 88E1                <1> 	mov	cl, ah
  5056 00008D25 01F1                <1> 	add	ecx, esi
  5057 00008D27 81F9FF310900        <1> 	cmp	ecx, Env_Page + Env_Page_Size - 1 
  5058                              <1> 		; 511 (4095) 
  5059                              <1> 		; strlen + '=' + 0
  5060 00008D2D 72DA                <1> 	jb	short set_env_chk_validation5
  5061                              <1> 
  5062                              <1> set_env_chk_validation8: ; variable not found
  5063 00008D2F 0FB6F4              <1> 	movzx	esi, ah  ; variable name length (with '=') 
  5064 00008D32 01DE                <1> 	add	esi, ebx ; position just after of the '='
  5065                              <1> 
  5066                              <1> set_env_chk_validation8_loop:
  5067 00008D34 AC                  <1> 	lodsb
  5068 00008D35 3C20                <1> 	cmp	al, 20h
  5069 00008D37 74FB                <1> 	je	short set_env_chk_validation8_loop	
  5070 00008D39 72C5                <1> 	jb	short set_env_string_nothing
  5071                              <1> 
  5072                              <1> set_env_chk_validation9:
  5073 00008D3B AC                  <1> 	lodsb
  5074 00008D3C 3C20                <1> 	cmp	al, 20h
  5075 00008D3E 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 00008D40 29DE                <1> 	sub	esi, ebx ; variable+definition length
  5081                              <1> 	
  5082 00008D42 56                  <1> 	push	esi ; *****
  5083                              <1> 
  5084 00008D43 89D6                <1> 	mov	esi, edx ; Environment page address
  5085                              <1> 
  5086 00008D45 B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)	
  5087                              <1> 
  5088                              <1> set_env_add_variable_loop:
  5089 00008D4A AC                  <1> 	lodsb
  5090 00008D4B 20C0                <1> 	and	al, al		
  5091 00008D4D 7406                <1> 	jz	short set_env_add_variable_chk1 ; 0
  5092 00008D4F E2F9                <1> 	loop	set_env_add_variable_loop
  5093                              <1> 
  5094                              <1> 	; 11/04/2016
  5095 00008D51 884EFF              <1> 	mov	[esi-1], cl ; 0
  5096 00008D54 41                  <1> 	inc	ecx
  5097                              <1> 	
  5098                              <1> set_env_add_variable_chk1: 
  5099 00008D55 49                  <1> 	dec	ecx
  5100 00008D56 7408                <1> 	jz	short set_env_add_variable_nspc
  5101 00008D58 AC                  <1> 	lodsb
  5102 00008D59 08C0                <1> 	or 	al, al
  5103 00008D5B 740C                <1> 	jz	short set_env_add_variable_chk2 ; 00
  5104 00008D5D 49                  <1> 	dec	ecx
  5105 00008D5E 75EA                <1> 	jnz	short set_env_add_variable_loop
  5106                              <1> 
  5107                              <1> set_env_add_variable_nspc: ; no space on environment page
  5108 00008D60 58                  <1> 	pop	eax ; *****
  5109 00008D61 B808000000          <1> 	mov	eax, 8 ; No space for new environment string
  5110 00008D66 F9                  <1> 	stc
  5111 00008D67 EB92                <1>         jmp     short set_env_string_allocate_envb_retn
  5112                              <1> 
  5113                              <1> set_env_add_variable_chk2:
  5114 00008D69 8B0C24              <1> 	mov	ecx, [esp] ; *****
  5115 00008D6C 4E                  <1> 	dec	esi ; beginning address of the new variable
  5116 00008D6D 89F0                <1> 	mov	eax, esi
  5117 00008D6F 01C8                <1> 	add	eax, ecx ; string length (with CR)
  5118 00008D71 81C200020000        <1> 	add	edx, Env_Page_Size ; 512 (4096)
  5119 00008D77 39D0                <1> 	cmp	eax, edx 
  5120 00008D79 77E5                <1> 	ja	short set_env_add_variable_nspc
  5121 00008D7B 49                  <1> 	dec	ecx ; except CR at the end
  5122 00008D7C 89CA                <1> 	mov	edx, ecx ; 12/04/2016
  5123 00008D7E 89F7                <1> 	mov	edi, esi
  5124 00008D80 893C24              <1> 	mov	[esp], edi ; ***** ; Start address of new variable
  5125 00008D83 89DE                <1> 	mov	esi, ebx ; ASCIIZ environment string address
  5126 00008D85 F3A4                <1> 	rep	movsb
  5127 00008D87 28C0                <1> 	sub	al, al
  5128 00008D89 AA                  <1> 	stosb
  5129 00008D8A 58                  <1> 	pop	eax ; ***** ; Beginning address of new variable			
  5130 00008D8B 81FF00320900        <1>         cmp     edi, Env_Page + Env_Page_Size ; 12/04/2016
  5131 00008D91 0F8364FFFFFF        <1>         jnb     set_env_string_allocate_envb_retn ; OK !
  5132 00008D97 880F                <1> 	mov	[edi], cl ; 0
  5133 00008D99 F8                  <1> 	clc	; 13/04/2016
  5134 00008D9A 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 00008D9F 8825[DC400100]      <1> 	mov	[env_var_length], ah
  5143                              <1> 
  5144 00008DA5 28C9                <1> 	sub	cl, cl ; ecx = 0
  5145                              <1> 
  5146 00008DA7 57                  <1> 	push	edi ; *****
  5147                              <1> 
  5148 00008DA8 89F7                <1> 	mov	edi, esi ; 11/04/2016
  5149                              <1> 
  5150                              <1> set_env_change_variable_calc1:
  5151 00008DAA AC                  <1> 	lodsb
  5152 00008DAB 08C0                <1> 	or	al, al
  5153 00008DAD 7403                <1> 	jz	short set_env_change_variable_calc2
  5154                              <1> 
  5155 00008DAF 41                  <1> 	inc	ecx ; length of environment string (after the '=')
  5156                              <1> 
  5157 00008DB0 EBF8                <1> 	jmp	short set_env_change_variable_calc1	
  5158                              <1> 
  5159                              <1> set_env_change_variable_calc2:
  5160 00008DB2 8B3424              <1> 	mov	esi, [esp] ; ASCIIZ environment string address
  5161                              <1> 	
  5162 00008DB5 29D2                <1> 	sub	edx, edx
  5163                              <1> 
  5164                              <1> set_env_change_variable_calc3:
  5165 00008DB7 AC                  <1> 	lodsb
  5166 00008DB8 3C20                <1> 	cmp	al, 20h
  5167 00008DBA 7203                <1> 	jb	short set_env_change_variable_calc4
  5168                              <1> 
  5169 00008DBC 42                  <1> 	inc	edx ; length of ASCIIZ string (after the '=')
  5170                              <1> 	
  5171 00008DBD EBF8                <1> 	jmp	short set_env_change_variable_calc3
  5172                              <1> 	
  5173                              <1> set_env_change_variable_calc4:
  5174 00008DBF C646FF00            <1> 	mov	byte [esi-1], 0  ; put ZERO instead of CR
  5175                              <1> 	
  5176 00008DC3 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 00008DC4 39CA                <1> 	cmp	edx, ecx
  5182 00008DC6 7717                <1> 	ja	short set_env_change_variable_calc5 ; longer
  5183 00008DC8 0F828F000000        <1>         jb      set_env_change_variable_calc9 ; shorter
  5184                              <1> 	
  5185                              <1> 	;same length (simple copy)
  5186 00008DCE 0FB6C4              <1> 	movzx	eax, ah
  5187 00008DD1 01C2                <1> 	add	edx, eax
  5188 00008DD3 F7D8                <1> 	neg	eax
  5189 00008DD5 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 00008DD7 F3A4                <1> 	rep	movsb
  5194 00008DD9 F8                  <1> 	clc	; 13/04/2016
  5195 00008DDA 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 00008DDF 52                  <1> 	push	edx ; *****
  5200 00008DE0 29CA                <1> 	sub	edx, ecx ; difference ; (the new string is longer)
  5201 00008DE2 89F3                <1> 	mov 	ebx, esi
  5202 00008DE4 89FE                <1> 	mov	esi, edi
  5203                              <1> 
  5204                              <1> set_env_change_variable_calc6:
  5205 00008DE6 AC                  <1> 	lodsb 
  5206 00008DE7 20C0                <1> 	and	al, al
  5207 00008DE9 75FB                <1> 	jnz	short set_env_change_variable_calc6
  5208                              <1> 
  5209 00008DEB 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5210 00008DF1 0F8369FFFFFF        <1>         jnb     set_env_add_variable_nspc
  5211                              <1> 
  5212 00008DF7 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5213 00008DF9 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5214                              <1> 
  5215 00008DFB AC                  <1> 	lodsb
  5216 00008DFC 08C0                <1> 	or	al, al
  5217 00008DFE 7416                <1> 	jz	short set_env_change_variable_calc8 ; 00
  5218                              <1> 
  5219                              <1> set_env_change_variable_calc7:
  5220 00008E00 AC                  <1> 	lodsb
  5221 00008E01 20C0                <1> 	and	al, al
  5222 00008E03 75FB                <1> 	jnz	short set_env_change_variable_calc7
  5223                              <1> 
  5224 00008E05 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5225 00008E0B 0F834FFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5226                              <1> 
  5227 00008E11 AC                  <1> 	lodsb
  5228 00008E12 08C0                <1> 	or	al, al
  5229 00008E14 75EA                <1> 	jnz	short set_env_change_variable_calc7
  5230                              <1> 
  5231                              <1> set_env_change_variable_calc8:
  5232 00008E16 4E                  <1> 	dec	esi ; address of the second (last) 0 of the 00
  5233                              <1> 
  5234 00008E17 01F2                <1> 	add	edx, esi ; final position of the last 0
  5235                              <1> 
  5236 00008E19 81FA00320900        <1> 	cmp	edx, Env_Page + Env_Page_Size ; 512 (4096)
  5237 00008E1F 0F833BFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5238                              <1> 
  5239 00008E25 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5240                              <1> 
  5241 00008E27 89F1                <1> 	mov	ecx, esi 
  5242 00008E29 29F9                <1> 	sub	ecx, edi ; count of bytes to move forward
  5243                              <1> 
  5244                              <1> 	; 13/04/2016
  5245 00008E2B C60200              <1> 	mov	byte [edx], 0
  5246 00008E2E 89D7                <1> 	mov	edi, edx
  5247 00008E30 29F2                <1> 	sub	edx, esi ; difference (additional byte count)
  5248 00008E32 4F                  <1> 	dec	edi ; the last zero address (first byte of the 00)
  5249 00008E33 89FE                <1> 	mov	esi, edi
  5250 00008E35 29D6                <1> 	sub	esi, edx ; - displacement
  5251                              <1> 	
  5252 00008E37 FA                  <1> 	cli	; disable interrupts
  5253 00008E38 FD                  <1> 	std	; backward
  5254                              <1> 
  5255 00008E39 F3A4                <1> 	rep	movsb ; move ECX bytes from DS:ESI to ES:EDI
  5256                              <1> 
  5257 00008E3B FC                  <1> 	cld	; forward (default)
  5258 00008E3C FB                  <1> 	sti	; enable interrupts
  5259                              <1> 	
  5260 00008E3D 89C7                <1> 	mov	edi, eax
  5261 00008E3F 59                  <1> 	pop	ecx ; ***** ; byte count (after '=')
  5262 00008E40 89CA                <1> 	mov	edx, ecx
  5263 00008E42 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5264 00008E44 89FB                <1> 	mov	ebx, edi
  5265                              <1> 
  5266 00008E46 F3A4                <1> 	rep	movsb
  5267                              <1> 
  5268 00008E48 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5269                              <1> 
  5270 00008E4A 0FB605[DC400100]    <1> 	movzx	eax, byte [env_var_length]
  5271 00008E51 01C2                <1> 	add	edx, eax ; variable length (total)
  5272 00008E53 F7D8                <1> 	neg	eax
  5273 00008E55 01D8                <1> 	add	eax, ebx ; start address of the variable
  5274 00008E57 F8                  <1> 	clc	; 13/04/2016
  5275 00008E58 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 00008E5D 21D2                <1> 	and	edx, edx ; is empty ?
  5280 00008E5F 753B                <1> 	jnz	short set_env_change_variable_calc15
  5281                              <1> 	
  5282 00008E61 0FB6DC              <1> 	movzx	ebx, ah
  5283 00008E64 F7DB                <1> 	neg	ebx
  5284 00008E66 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 00008E68 89FE                <1> 	mov	esi, edi
  5290                              <1> 
  5291                              <1> set_env_change_variable_calc10:
  5292 00008E6A AC                  <1> 	lodsb
  5293 00008E6B 08C0                <1> 	or	al, al
  5294 00008E6D 75FB                <1> 	jnz	short set_env_change_variable_calc10
  5295                              <1> 
  5296 00008E6F B9FF310900          <1> 	mov	ecx, Env_Page + Env_Page_Size - 1
  5297                              <1> 
  5298 00008E74 39CE                <1> 	cmp	esi, ecx ; +511 (+4095)
  5299 00008E76 7604                <1> 	jna	short set_env_change_variable_calc11
  5300                              <1> 
  5301 00008E78 89CE                <1> 	mov	esi, ecx
  5302 00008E7A 8806                <1> 	mov	[esi], al ; 0
  5303                              <1> 
  5304                              <1> set_env_change_variable_calc11:
  5305 00008E7C 89DF                <1> 	mov	edi, ebx ; old variable's start address
  5306                              <1> 
  5307                              <1> set_env_change_variable_calc12:
  5308 00008E7E AC                  <1> 	lodsb
  5309 00008E7F AA                  <1> 	stosb
  5310 00008E80 20C0                <1> 	and	al, al
  5311 00008E82 75FA                <1> 	jnz	short set_env_change_variable_calc12
  5312 00008E84 39CE                <1> 	cmp	esi, ecx
  5313 00008E86 7706                <1> 	ja	short set_env_change_variable_calc13
  5314 00008E88 AC                  <1> 	lodsb
  5315 00008E89 AA                  <1> 	stosb
  5316 00008E8A 20C0                <1> 	and	al, al
  5317 00008E8C 75F0                <1> 	jnz	short set_env_change_variable_calc12	
  5318                              <1> 
  5319                              <1> set_env_change_variable_calc13:
  5320 00008E8E 29F9                <1> 	sub	ecx, edi
  5321 00008E90 7203                <1> 	jb	short set_env_change_variable_calc14
  5322 00008E92 41                  <1> 	inc	ecx ; 1-512 (1-4096)
  5323 00008E93 F3AA                <1> 	rep	stosb ; al = 0	
  5324                              <1> 
  5325                              <1> set_env_change_variable_calc14:
  5326 00008E95 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 00008E97 E95FFEFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5331                              <1> 	    
  5332                              <1> set_env_change_variable_calc15:	
  5333 00008E9C 52                  <1> 	push	edx ; *****
  5334 00008E9D F7DA                <1> 	neg	edx
  5335 00008E9F 01CA                <1> 	add	edx, ecx ; difference (the old string is longer)
  5336 00008EA1 89F3                <1> 	mov 	ebx, esi
  5337 00008EA3 89FE                <1> 	mov	esi, edi
  5338                              <1> 
  5339                              <1> set_env_change_variable_calc16:
  5340 00008EA5 AC                  <1> 	lodsb 
  5341 00008EA6 20C0                <1> 	and	al, al
  5342 00008EA8 75FB                <1> 	jnz	short set_env_change_variable_calc16
  5343                              <1> 
  5344 00008EAA B900320900          <1> 	mov	ecx, Env_Page + Env_Page_Size
  5345                              <1> 
  5346 00008EAF 39CE                <1> 	cmp	esi, ecx ; +512 (+4096)
  5347 00008EB1 7605                <1> 	jna	short set_env_change_variable_calc17
  5348                              <1> 
  5349 00008EB3 89CE                <1> 	mov	esi, ecx
  5350 00008EB5 8846FF              <1> 	mov	[esi-1], al ; 0
  5351                              <1> 
  5352                              <1> set_env_change_variable_calc17:
  5353 00008EB8 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5354 00008EBA 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5355                              <1> 
  5356 00008EBC AC                  <1> 	lodsb
  5357 00008EBD 08C0                <1> 	or	al, al
  5358 00008EBF 741D                <1> 	jz	short set_env_change_variable_calc20
  5359                              <1> 
  5360                              <1> set_env_change_variable_calc18:
  5361 00008EC1 AC                  <1> 	lodsb
  5362 00008EC2 20C0                <1> 	and	al, al
  5363 00008EC4 75FB                <1> 	jnz	short set_env_change_variable_calc18
  5364                              <1> 
  5365 00008EC6 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size
  5366 00008ECC 720B                <1> 	jb	short set_env_change_variable_calc19
  5367 00008ECE 740E                <1> 	je	short set_env_change_variable_calc20
  5368                              <1> 
  5369 00008ED0 BEFF310900          <1> 	mov	esi, Env_Page + Env_Page_Size - 1
  5370 00008ED5 8806                <1> 	mov	[esi], al ; 0
  5371 00008ED7 EB06                <1> 	jmp	short set_env_change_variable_calc21
  5372                              <1> 
  5373                              <1> set_env_change_variable_calc19:
  5374 00008ED9 AC                  <1> 	lodsb
  5375 00008EDA 08C0                <1> 	or	al, al
  5376 00008EDC 75E3                <1> 	jnz	short set_env_change_variable_calc18
  5377                              <1> 
  5378                              <1> set_env_change_variable_calc20:
  5379 00008EDE 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 00008EDF 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5385                              <1> 
  5386 00008EE1 89F1                <1> 	mov	ecx, esi 
  5387 00008EE3 29F9                <1> 	sub	ecx, edi ; count of bytes to move backward
  5388                              <1> 
  5389 00008EE5 89FE                <1> 	mov	esi, edi ; next variable's address
  5390 00008EE7 29D7                <1> 	sub	edi, edx ; (displacement)
  5391                              <1> 	
  5392 00008EE9 F3A4                <1> 	rep	movsb
  5393                              <1> 
  5394 00008EEB 880F                <1> 	mov	[edi], cl ; 0 ; 00 ; end of environment variables
  5395                              <1> 
  5396 00008EED 89C7                <1> 	mov	edi, eax
  5397 00008EEF 5A                  <1> 	pop	edx ; ***** ; byte count (after '=')
  5398 00008EF0 89D1                <1> 	mov	ecx, edx
  5399 00008EF2 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5400 00008EF4 89FB                <1> 	mov	ebx, edi
  5401                              <1> 	
  5402 00008EF6 F3A4                <1> 	rep	movsb
  5403                              <1> 
  5404 00008EF8 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5405                              <1> 
  5406 00008EFA 0FB605[DC400100]    <1> 	movzx	eax, byte [env_var_length]
  5407 00008F01 01C2                <1> 	add	edx, eax ; variable length (total)
  5408 00008F03 F7D8                <1> 	neg	eax
  5409 00008F05 01D8                <1> 	add	eax, ebx ; start address of the variable
  5410 00008F07 F8                  <1> 	clc	; 13/04/2016
  5411 00008F08 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 00008F0D BE[5BF00000]        <1> 	mov	esi, MainProgCfgFile
  5420 00008F12 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5421 00008F16 E8E8E9FFFF          <1> 	call	find_first_file
  5422 00008F1B 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 00008F1D A3[5C340100]        <1> 	mov	[MainProgCfg_FileSize], eax
  5432                              <1> 
  5433 00008F22 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  5434 00008F26 C1E210              <1> 	shl	edx, 16
  5435 00008F29 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  5436 00008F2D 8915[90400100]      <1> 	mov	[csftdf_sf_cluster], edx
  5437                              <1> 
  5438 00008F33 89C1                <1> 	mov	ecx, eax
  5439 00008F35 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 00008F37 E8C4C4FFFF          <1> 	call	allocate_memory_block
  5448 00008F3C 7235                <1> 	jc	short loc_load_mainprog_cfg_exit
  5449                              <1> 
  5450 00008F3E A3[88400100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  5451 00008F43 890D[8C400100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  5452                              <1> 
  5453 00008F49 31DB                <1> 	xor	ebx, ebx
  5454                              <1> 	;mov	[csftdf_sf_rbytes], ebx ; 0, reset
  5455                              <1> 
  5456 00008F4B 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv] ; [FindFile_Drv]
  5457 00008F51 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  5458 00008F56 01DE                <1> 	add	esi, ebx
  5459                              <1> 
  5460 00008F58 8B1D[88400100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  5461                              <1> 
  5462 00008F5E 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5463 00008F62 7710                <1>         ja	short loc_mcfg_load_fat_file
  5464                              <1> 
  5465 00008F64 C705[98400100]0000- <1> 	mov	dword [csftdf_r_size], 65536
  5465 00008F6C 0100                <1>
  5466 00008F6E E992010000          <1>         jmp     loc_mcfg_load_fs_file
  5467                              <1> 
  5468                              <1> loc_load_mainprog_cfg_exit:
  5469 00008F73 C3                  <1> 	retn 
  5470                              <1> 
  5471                              <1> loc_mcfg_load_fat_file:
  5472 00008F74 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
  5473 00008F78 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  5474 00008F7C F7E1                <1> 	mul	ecx
  5475 00008F7E A3[98400100]        <1> 	mov	[csftdf_r_size], eax
  5476                              <1> 
  5477                              <1> loc_mcfg_load_fat_file_next:
  5478 00008F83 E813010000          <1> 	call	mcfg_read_fat_file_sectors
  5479 00008F88 0F82F7000000        <1>         jc      mcfg_deallocate_mem
  5480                              <1> 
  5481 00008F8E 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  5482 00008F90 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 00008F92 C705[2C410100]-     <1> 	mov	dword [mainprog_return_addr], loc_mcfg_ci_return_addr 
  5486 00008F98 [46900000]          <1>
  5487                              <1> 	;
  5488 00008F9C 8B35[88400100]      <1> 	mov	esi, [csftdf_sf_mem_addr]
  5489 00008FA2 8935[60340100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5490                              <1> 	
  5491 00008FA8 A1[5C340100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5492 00008FAD 89C2                <1> 	mov	edx, eax
  5493 00008FAF 01F2                <1> 	add	edx, esi
  5494                              <1> 
  5495                              <1> loc_mcfg_process_next_line_check:
  5496 00008FB1 89C1                <1> 	mov	ecx, eax
  5497                              <1> 
  5498 00008FB3 803E2A              <1> 	cmp	byte [esi], "*" ; Remark sign
  5499 00008FB6 7503                <1> 	jne	short loc_mcfg_process_next_line
  5500 00008FB8 46                  <1> 	inc	esi
  5501 00008FB9 EB17                <1> 	jmp	short loc_move_mainprog_cfg_nl1
  5502                              <1> 
  5503                              <1> loc_mcfg_process_next_line:
  5504 00008FBB 83F94F              <1> 	cmp	ecx, 79
  5505 00008FBE 7605                <1> 	jna	short loc_start_mainprog_cfg_process
  5506                              <1> 	
  5507 00008FC0 B94F000000          <1> 	mov	ecx, 79 
  5508                              <1> 
  5509                              <1> loc_start_mainprog_cfg_process:
  5510 00008FC5 BF[1E350100]        <1> 	mov	edi, CommandBuffer
  5511                              <1> 
  5512                              <1> loc_move_mainprog_cfg_line:
  5513 00008FCA AC                  <1> 	lodsb
  5514 00008FCB 3C20                <1> 	cmp	al, 20h
  5515 00008FCD 720C                <1> 	jb	short loc_move_mainprog_cfg_nl2
  5516 00008FCF AA                  <1> 	stosb
  5517 00008FD0 E2F8                <1> 	loop	loc_move_mainprog_cfg_line
  5518                              <1> 
  5519                              <1> loc_move_mainprog_cfg_nl1:
  5520 00008FD2 39D6                <1> 	cmp	esi, edx ; + configuration file size
  5521 00008FD4 7312                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5522 00008FD6 AC                  <1> 	lodsb
  5523 00008FD7 3C20                <1> 	cmp	al, 20h
  5524 00008FD9 73F7                <1> 	jnb	short loc_move_mainprog_cfg_nl1
  5525                              <1> 
  5526                              <1> loc_move_mainprog_cfg_nl2:
  5527 00008FDB 39D6                <1> 	cmp	esi, edx
  5528 00008FDD 7309                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5529 00008FDF 8A06                <1> 	mov	al, [esi]
  5530 00008FE1 3C20                <1> 	cmp	al, 20h
  5531 00008FE3 7703                <1>  	ja	short loc_end_of_mainprog_cfg_line
  5532 00008FE5 46                  <1> 	inc	esi
  5533 00008FE6 EBF3                <1> 	jmp	short loc_move_mainprog_cfg_nl2	               
  5534                              <1> 
  5535                              <1> loc_end_of_mainprog_cfg_line:
  5536 00008FE8 C60700              <1> 	mov	byte [edi], 0
  5537                              <1> 
  5538 00008FEB 8935[60340100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5539                              <1> 	
  5540                              <1> loc_move_mainprog_cfg_command:
  5541 00008FF1 BE[1E350100]        <1> 	mov	esi, CommandBuffer
  5542 00008FF6 89F7                <1> 	mov	edi, esi
  5543 00008FF8 31DB                <1> 	xor	ebx, ebx
  5544                              <1> 	;xor	ecx, ecx
  5545 00008FFA 30C9                <1> 	xor	cl, cl
  5546                              <1> 
  5547                              <1> loc_move_mcfg_first_cmd_char:
  5548 00008FFC 8A041E              <1> 	mov	al, [esi+ebx]
  5549 00008FFF FEC3                <1> 	inc	bl 
  5550 00009001 3C20                <1> 	cmp	al, 20h
  5551 00009003 7712                <1> 	ja	short loc_move_mcfg_cmd_capitalizing
  5552 00009005 7237                <1> 	jb	short loc_move_mcfg_cmd_arguments_ok
  5553 00009007 80FB4F              <1> 	cmp	bl, 79
  5554 0000900A 72F0                <1> 	jb	short loc_move_mcfg_first_cmd_char
  5555 0000900C EB30                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5556                              <1> 
  5557                              <1> loc_move_mcfg_next_cmd_char:
  5558 0000900E 8A041E              <1> 	mov	al, [esi+ebx]
  5559 00009011 FEC3                <1> 	inc	bl
  5560 00009013 3C20                <1> 	cmp	al, 20h
  5561 00009015 7614                <1> 	jna	short loc_move_mcfg_cmd_ok
  5562                              <1> 
  5563                              <1> loc_move_mcfg_cmd_capitalizing:
  5564 00009017 3C61                <1> 	cmp	al, 61h ; 'a'
  5565 00009019 7206                <1> 	jb	short loc_move_mcfg_cmd_caps_ok
  5566 0000901B 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  5567 0000901D 7702                <1> 	ja	short loc_move_mcfg_cmd_caps_ok
  5568 0000901F 24DF                <1> 	and	al, 0DFh ; sub	al, 'a'-'A'
  5569                              <1> 
  5570                              <1> loc_move_mcfg_cmd_caps_ok:
  5571 00009021 AA                  <1> 	stosb 
  5572 00009022 FEC1                <1> 	inc	cl
  5573 00009024 80FB4F              <1> 	cmp	bl, 79
  5574 00009027 72E5                <1> 	jb	short loc_move_mcfg_next_cmd_char
  5575 00009029 EB13                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5576                              <1> 
  5577                              <1> loc_move_mcfg_cmd_ok:
  5578 0000902B 30C0                <1> 	xor	al, al ; 0
  5579                              <1> 
  5580                              <1> loc_move_mcfg_cmd_arguments:
  5581 0000902D 8807                <1> 	mov	[edi], al
  5582 0000902F 47                  <1> 	inc	edi
  5583 00009030 80FB4F              <1> 	cmp	bl, 79
  5584 00009033 7309                <1> 	jnb	short loc_move_mcfg_cmd_arguments_ok
  5585 00009035 8A041E              <1> 	mov	al, [esi+ebx]
  5586 00009038 FEC3                <1> 	inc	bl
  5587 0000903A 3C20                <1> 	cmp	al, 20h
  5588 0000903C 73EF                <1> 	jnb	short loc_move_mcfg_cmd_arguments
  5589                              <1> 	
  5590                              <1> loc_move_mcfg_cmd_arguments_ok:
  5591 0000903E C60700              <1> 	mov	byte [edi], 0
  5592                              <1>        
  5593                              <1> loc_mcfg_process_cmd_interpreter:
  5594 00009041 E8F4DFFFFF          <1> 	call    command_interpreter
  5595                              <1> 
  5596                              <1> loc_mcfg_ci_return_addr: 
  5597 00009046 A1[5C340100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5598 0000904B 89C2                <1> 	mov	edx, eax
  5599 0000904D 8B35[60340100]      <1> 	mov	esi, [MainProgCfg_LineOffset]
  5600 00009053 01F2                <1> 	add	edx, esi
  5601 00009055 0305[88400100]      <1> 	add	eax, [csftdf_sf_mem_addr]
  5602 0000905B 29F0                <1> 	sub	eax, esi
  5603 0000905D 0F874EFFFFFF        <1>         ja      loc_mcfg_process_next_line_check
  5604                              <1> 
  5605 00009063 E81D000000          <1> 	call	mcfg_deallocate_mem
  5606                              <1>  
  5607 00009068 B94F000000          <1>  	mov	ecx, 79 ; 80 ?
  5608 0000906D BF[1E350100]        <1> 	mov	edi, CommandBuffer
  5609 00009072 30C0                <1> 	xor	al, al
  5610 00009074 F3AA                <1> 	rep	stosb
  5611                              <1> 
  5612                              <1> 	; 06/05/2016
  5613 00009076 BE[97020100]        <1> 	mov	esi, nextline
  5614 0000907B E8F1CBFFFF          <1> 	call	print_msg
  5615 00009080 E92DD6FFFF          <1> 	jmp	dos_prompt
  5616                              <1> 
  5617                              <1> mcfg_deallocate_mem:
  5618 00009085 A1[88400100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  5619 0000908A 8B0D[8C400100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  5620                              <1> 	;call	deallocate_memory_block
  5621                              <1> 	;retn
  5622 00009090 E96CC5FFFF          <1> 	jmp	deallocate_memory_block
  5623                              <1> 
  5624                              <1> mcfg_read_file_sectors:
  5625                              <1> 	; 14/04/2016
  5626 00009095 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5627 00009099 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 0000909B 8B15[5C340100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5637 000090A1 2B15[A0400100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  5638 000090A7 3B15[98400100]      <1> 	cmp	edx, [csftdf_r_size]	
  5639 000090AD 7306                <1> 	jnb	short mcfg_read_fat_file_secs_1
  5640 000090AF 8915[98400100]      <1> 	mov	[csftdf_r_size], edx
  5641                              <1> 		
  5642                              <1> mcfg_read_fat_file_secs_1:
  5643 000090B5 A1[98400100]        <1> 	mov	eax, [csftdf_r_size]
  5644 000090BA 29D2                <1> 	sub	edx, edx
  5645 000090BC 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  5646 000090C0 01C8                <1> 	add	eax, ecx
  5647 000090C2 48                  <1> 	dec	eax
  5648 000090C3 F7F1                <1> 	div	ecx
  5649 000090C5 89C1                <1> 	mov	ecx, eax ; sector count
  5650 000090C7 A1[90400100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5651                              <1> 
  5652                              <1> 	; EBX = memory block address (current)
  5653                              <1> 	
  5654 000090CC E88E230000          <1> 	call	read_fat_file_sectors
  5655 000090D1 7230                <1> 	jc	short mcfg_read_fat_file_secs_3
  5656                              <1> 
  5657                              <1> 	; EBX = next memory address
  5658                              <1> 
  5659 000090D3 A1[A0400100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  5660 000090D8 0305[98400100]      <1> 	add	eax, [csftdf_r_size]
  5661 000090DE 8B15[5C340100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5662 000090E4 39D0                <1> 	cmp	eax, edx
  5663 000090E6 731B                <1> 	jnb	short mcfg_read_fat_file_secs_3 ; edx > 0
  5664 000090E8 A3[A0400100]        <1> 	mov	[csftdf_sf_rbytes], eax
  5665                              <1> 
  5666 000090ED 53                  <1> 	push	ebx ; *
  5667                              <1> 	; get next cluster (csftdf_r_size! bytes)
  5668 000090EE A1[90400100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5669 000090F3 E839210000          <1> 	call	get_next_cluster
  5670 000090F8 5B                  <1> 	pop	ebx ; *
  5671 000090F9 7301                <1> 	jnc	short mcfg_read_fat_file_secs_2
  5672                              <1> 
  5673                              <1> 	;mov	eax, 17; Read error !
  5674 000090FB C3                  <1> 	retn
  5675                              <1> 
  5676                              <1> mcfg_read_fat_file_secs_2:
  5677 000090FC 29D2                <1> 	sub	edx, edx ; 0
  5678 000090FE A3[90400100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  5679                              <1> 
  5680                              <1> mcfg_read_fat_file_secs_3:
  5681 00009103 C3                  <1> 	retn
  5682                              <1> 
  5683                              <1> mcfg_read_fs_file_sectors:
  5684 00009104 C3                  <1> 	retn
  5685                              <1> 
  5686                              <1> loc_mcfg_load_fs_file:
  5687 00009105 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 00009106 803E20              <1> 	cmp	byte [esi], 20h
  5708 00009109 0F82F2E2FFFF        <1> 	jb	loc_cmd_failed
  5709 0000910F 7703                <1> 	ja	short loc_run_check_filename_ok
  5710 00009111 46                  <1> 	inc	esi
  5711 00009112 EBF2                <1> 	jmp	short loc_run_check_filename
  5712                              <1> 
  5713                              <1> loc_run_check_filename_ok:
  5714 00009114 C605[CF340100]00    <1> 	mov	byte [CmdArgStart], 0 ; reset
  5715 0000911B 56                  <1> 	push	esi ; *
  5716                              <1> loc_run_get_first_arg_pos:
  5717 0000911C 46                  <1> 	inc	esi
  5718 0000911D 8A06                <1> 	mov	al, [esi]
  5719 0000911F 3C20                <1> 	cmp	al, 20h
  5720 00009121 77F9                <1> 	ja	short loc_run_get_first_arg_pos
  5721 00009123 C60600              <1> 	mov	byte [esi], 0
  5722                              <1> loc_run_get_external_arg_pos:
  5723                              <1> 	; 11/05/2016
  5724 00009126 46                  <1> 	inc	esi
  5725 00009127 8A06                <1> 	mov	al, [esi]
  5726 00009129 3C20                <1> 	cmp	al, 20h
  5727 0000912B 760C                <1> 	jna	short loc_run_parse_path_name
  5728 0000912D 89F0                <1> 	mov	eax, esi
  5729 0000912F 2D[1E350100]        <1> 	sub	eax, CommandBuffer
  5730 00009134 A2[CF340100]        <1> 	mov	byte [CmdArgStart], al
  5731                              <1> loc_run_parse_path_name:
  5732 00009139 5E                  <1> 	pop	esi ; *
  5733 0000913A BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  5734 0000913F E8D6090000          <1> 	call	parse_path_name
  5735 00009144 0F82B7E2FFFF        <1> 	jc	loc_cmd_failed
  5736                              <1> 
  5737                              <1> loc_run_check_filename_exists:
  5738 0000914A BE[543E0100]        <1> 	mov	esi, FindFile_Name
  5739 0000914F 803E20              <1> 	cmp	byte [esi], 20h
  5740 00009152 0F86A9E2FFFF        <1> 	jna	loc_cmd_failed
  5741                              <1> 
  5742                              <1> loc_run_check_exe_filename_ext:
  5743 00009158 E891020000          <1> 	call	check_prg_filename_ext
  5744 0000915D 0F829EE2FFFF        <1> 	jc	loc_cmd_failed
  5745                              <1> 	
  5746                              <1> loc_run_check_exe_filename_ext_ok:
  5747 00009163 66A3[2A410100]      <1> 	mov	word [EXE_ID], ax
  5748                              <1> 
  5749                              <1> loc_run_drv:
  5750 00009169 C605[29410100]00    <1> 	mov	byte [Run_Manual_Path], 0
  5751 00009170 A1[68340100]        <1> 	mov	eax, [Current_Dir_FCluster]
  5752 00009175 A3[24410100]        <1>         mov     [Run_CDirFC], eax
  5753                              <1> 	;
  5754 0000917A 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  5755 00009180 8835[CE3C0100]      <1> 	mov	[RUN_CDRV], dh
  5756                              <1> 
  5757 00009186 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  5758 0000918C 38F2                <1> 	cmp	dl, dh
  5759 0000918E 7412                <1> 	je	short loc_run_change_directory
  5760                              <1>                
  5761 00009190 8005[29410100]02    <1> 	add	byte [Run_Manual_Path], 2
  5762                              <1> 
  5763 00009197 E8D5D3FFFF          <1> 	call	change_current_drive
  5764 0000919C 0F828AE2FFFF        <1> 	jc	loc_run_cmd_failed
  5765                              <1> 
  5766                              <1> loc_run_change_directory:
  5767 000091A2 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  5768 000091A9 7623                <1> 	jna	short loc_run_find_executable_file
  5769                              <1> 
  5770 000091AB FE05[29410100]      <1> 	inc	byte [Run_Manual_Path]
  5771                              <1>      
  5772 000091B1 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  5773                              <1> 
  5774 000091B7 BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  5775 000091BC 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  5776 000091BE E843030000          <1> 	call	change_current_directory
  5777 000091C3 0F8263E2FFFF        <1> 	jc	loc_run_cmd_failed
  5778                              <1> 
  5779                              <1> loc_run_change_prompt_dir_string:
  5780 000091C9 E858020000          <1> 	call	change_prompt_dir_string
  5781                              <1> 
  5782                              <1> loc_run_find_executable_file:
  5783 000091CE 66C705[28410100]00- <1> 	mov	word [Run_Auto_Path], 0
  5783 000091D6 00                  <1>
  5784                              <1> 
  5785                              <1> loc_run_find_executable_file_next:
  5786 000091D7 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  5787                              <1> loc_run_find_program_file_next:
  5788 000091DC 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5789 000091E0 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 000091E5 0F835C010000        <1> 	jnc	loc_load_and_run_file
  5794                              <1> 	 
  5795 000091EB 3C02                <1> 	cmp	al, 2 ; file not found
  5796 000091ED 0F8539E2FFFF        <1> 	jne	loc_run_cmd_failed
  5797                              <1> 
  5798 000091F3 66A1[2A410100]      <1> 	mov	ax, word [EXE_ID]
  5799 000091F9 80FC2E              <1> 	cmp	ah, '.' ; File name has extension sign
  5800 000091FC 7424                <1> 	je	short loc_run_check_auto_path
  5801                              <1> 
  5802 000091FE 08C0                <1> 	or	al, al
  5803 00009200 7520                <1> 	jnz	short loc_run_check_auto_path
  5804                              <1> 
  5805 00009202 80FC08              <1> 	cmp	ah, 8 ; count of file name chars
  5806 00009205 771B                <1> 	ja	short loc_run_check_auto_path
  5807                              <1> 
  5808                              <1> loc_run_change_file_ext_to_prg:
  5809 00009207 0FB6DC              <1> 	movzx	ebx, ah ; count of file name chars
  5810 0000920A BE[543E0100]        <1> 	mov	esi, FindFile_Name
  5811 0000920F 01F3                <1> 	add	ebx, esi	
  5812                              <1> 	; 07/05/2016
  5813 00009211 C7032E505247        <1> 	mov	dword [ebx],  '.PRG'
  5814 00009217 66C705[2A410100]50- <1> 	mov	word [EXE_ID], 'P.'
  5814 0000921F 2E                  <1>
  5815 00009220 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 00009222 A0[29410100]        <1> 	mov	al, [Run_Manual_Path]
  5826 00009227 08C0                <1> 	or	al, al
  5827 00009229 0F85D2E1FFFF        <1> 	jnz	loc_cmd_failed
  5828                              <1> 
  5829                              <1> loc_run_check_auto_path_again:
  5830 0000922F 66833D[28410100]FF  <1> 	cmp	word [Run_Auto_Path], 0FFFFh		 
  5831                              <1> 		; 0FFFFh = Not a valid run path (in ENV block) 
  5832 00009237 0F83C4E1FFFF        <1> 	jnb	loc_cmd_failed
  5833                              <1> 	; xor	al, al 
  5834 0000923D BE[E1F00000]        <1> 	mov	esi, Cmd_Path ; 'PATH'
  5835 00009242 BF[6E350100]        <1> 	mov	edi, TextBuffer
  5836 00009247 E857F9FFFF          <1> 	call	get_environment_string
  5837 0000924C 730E                <1> 	jnc	short loc_run_chk_filename_ext_again
  5838 0000924E 66C705[28410100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; invalid
  5838 00009256 FF                  <1>
  5839 00009257 E9A5E1FFFF          <1> 	jmp	loc_cmd_failed
  5840                              <1> 
  5841                              <1> loc_run_chk_filename_ext_again:
  5842 0000925C 89C1                <1> 	mov	ecx, eax ; string length (with zero tail)
  5843 0000925E 49                  <1> 	dec	ecx ; without zero tail
  5844 0000925F 66A1[2A410100]      <1> 	mov	ax, [EXE_ID]
  5845 00009265 80FC2E              <1> 	cmp	ah, '.'
  5846 00009268 740E                <1> 	je	short loc_run_chk_auto_path_pos
  5847                              <1> 	 
  5848                              <1> loc_run_change_file_ext_to_noext_again:
  5849 0000926A 0FB6DC              <1> 	movzx	ebx, ah
  5850 0000926D BE[543E0100]        <1> 	mov	esi, FindFile_Name
  5851 00009272 01F3                <1> 	add 	ebx, esi
  5852 00009274 29C0                <1> 	sub	eax, eax
  5853 00009276 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 00009278 66A1[28410100]      <1> 	mov	ax, [Run_Auto_Path]
  5858 0000927E 39C8                <1> 	cmp	eax, ecx ; ecx = string length (except zero tail)
  5859 00009280 0F837BE1FFFF        <1> 	jnb	loc_cmd_failed
  5860                              <1> 	;or	eax, eax
  5861 00009286 6609C0              <1> 	or	ax, ax
  5862 00009289 7502                <1> 	jnz	short loc_run_auto_path_pos_move
  5863 0000928B B005                <1> 	mov	al, 5
  5864                              <1> 
  5865                              <1> loc_run_auto_path_pos_move:
  5866 0000928D 89FE                <1> 	mov	esi, edi ; offset TextBuffer
  5867 0000928F 01C6                <1> 	add	esi, eax
  5868                              <1> 
  5869                              <1> loc_run_auto_path_pos_space_loop:
  5870 00009291 AC                  <1> 	lodsb
  5871 00009292 3C20                <1> 	cmp	al, 20h 
  5872 00009294 74FB                <1> 	je	short loc_run_auto_path_pos_space_loop
  5873 00009296 0F8265E1FFFF        <1> 	jb	loc_cmd_failed 
  5874 0000929C AA                  <1> 	stosb
  5875                              <1> loc_run_auto_path_pos_move_next: 
  5876 0000929D AC                  <1> 	lodsb
  5877 0000929E 3C3B                <1> 	cmp	al, ';'
  5878 000092A0 7414                <1> 	je	short loc_run_auto_path_pos_move_last_byte
  5879 000092A2 3C20                <1> 	cmp	al, 20h
  5880 000092A4 74F7                <1> 	je	short loc_run_auto_path_pos_move_next
  5881 000092A6 7203                <1> 	jb	short loc_byte_ptr_end_of_path
  5882 000092A8 AA                  <1> 	stosb
  5883 000092A9 EBF2                <1> 	jmp	short loc_run_auto_path_pos_move_next 
  5884                              <1> 
  5885                              <1> loc_byte_ptr_end_of_path: 
  5886 000092AB 66C705[28410100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; end of path
  5886 000092B3 FF                  <1>
  5887 000092B4 EB0D                <1> 	jmp	short loc_run_auto_path_move_ok 
  5888                              <1> 
  5889                              <1> loc_run_auto_path_pos_move_last_byte:
  5890 000092B6 89F0                <1> 	mov	eax, esi
  5891 000092B8 2D[6E350100]        <1> 	sub	eax, TextBuffer 
  5892 000092BD 66A3[28410100]      <1> 	mov	[Run_Auto_Path], ax ; next path position
  5893                              <1> 
  5894                              <1> loc_run_auto_path_move_ok:
  5895 000092C3 4F                  <1> 	dec	edi
  5896 000092C4 B02F                <1> 	mov	al, '/'
  5897 000092C6 3807                <1> 	cmp	[edi], al
  5898 000092C8 7403                <1> 	je	short loc_run_auto_path_move_file_name
  5899 000092CA 47                  <1> 	inc	edi
  5900 000092CB 8807                <1> 	mov	[edi], al
  5901                              <1> 
  5902                              <1> loc_run_auto_path_move_file_name:
  5903 000092CD 47                  <1> 	inc	edi   
  5904 000092CE BE[543E0100]        <1> 	mov	esi, FindFile_Name
  5905                              <1> 
  5906                              <1> loc_run_auto_path_move_fn_loop:
  5907 000092D3 AC                  <1> 	lodsb
  5908 000092D4 AA                  <1> 	stosb
  5909 000092D5 08C0                <1> 	or	al, al
  5910 000092D7 75FA                <1> 	jnz	short loc_run_auto_path_move_fn_loop
  5911                              <1> 
  5912 000092D9 BE[6E350100]        <1> 	mov	esi, TextBuffer
  5913 000092DE BF[123E0100]        <1> 	mov	edi, FindFile_Drv
  5914 000092E3 E832080000          <1> 	call	parse_path_name
  5915 000092E8 0F8213E1FFFF        <1> 	jc	loc_cmd_failed
  5916                              <1> 
  5917 000092EE 8A35[6E340100]      <1> 	mov	dh, [Current_Drv]
  5918 000092F4 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  5919 000092FA 38F2                <1> 	cmp	dl, dh
  5920 000092FC 740B                <1> 	je	short loc_run_change_directory_again
  5921                              <1>                
  5922 000092FE E86ED2FFFF          <1> 	call	change_current_drive
  5923 00009303 0F8223E1FFFF        <1> 	jc	loc_run_cmd_failed
  5924                              <1> 
  5925                              <1> loc_run_change_directory_again:
  5926 00009309 803D[133E0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  5927 00009310 761D                <1> 	jna	short loc_load_executable_cdir_chk_again
  5928                              <1> 
  5929 00009312 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  5930 00009318 BE[133E0100]        <1> 	mov	esi, FindFile_Directory
  5931 0000931D 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  5932 0000931F E8E2010000          <1> 	call	change_current_directory
  5933 00009324 0F8202E1FFFF        <1> 	jc	loc_run_cmd_failed
  5934                              <1> 
  5935                              <1> loc_run_chg_prompt_dir_str_again:
  5936 0000932A E8F7000000          <1> 	call	change_prompt_dir_string
  5937                              <1> 
  5938                              <1> loc_load_executable_cdir_chk_again:
  5939 0000932F A1[68340100]        <1> 	mov	eax, [Current_Dir_FCluster]
  5940 00009334 3B05[24410100]      <1> 	cmp	eax, [Run_CDirFC]
  5941 0000933A 0F8597FEFFFF        <1> 	jne	loc_run_find_executable_file_next
  5942 00009340 30C0                <1> 	xor	al, al ; 0
  5943 00009342 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 00009347 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  5949 0000934C BF[6E350100]        <1> 	mov	edi, TextBuffer
  5950                              <1> 
  5951                              <1>  	; 24/04/2016
  5952 00009351 31D2                <1> 	xor	edx, edx
  5953 00009353 668915[664A0100]    <1> 	mov	word [argc], dx ; 0
  5954 0000935A 8915[0C4A0100]      <1> 	mov	dword [u.nread], edx ; 0
  5955                              <1> 
  5956                              <1> loc_load_and_run_file_1:
  5957 00009360 AC                  <1> 	lodsb	
  5958 00009361 AA                  <1> 	stosb
  5959 00009362 FF05[0C4A0100]      <1> 	inc	dword [u.nread]
  5960 00009368 20C0                <1> 	and	al, al
  5961 0000936A 75F4                <1> 	jnz 	short loc_load_and_run_file_1
  5962                              <1> 	
  5963 0000936C A0[CF340100]        <1> 	mov	al, [CmdArgStart]
  5964 00009371 20C0                <1> 	and	al, al
  5965 00009373 7445                <1> 	jz	short loc_load_and_run_file_7
  5966                              <1> 
  5967 00009375 0FB6F0              <1> 	movzx	esi, al ; 11/05/2016
  5968 00009378 B950000000          <1> 	mov	ecx, 80
  5969 0000937D 29F1                <1> 	sub	ecx, esi
  5970 0000937F 81C6[1E350100]      <1> 	add	esi, CommandBuffer
  5971                              <1> 
  5972 00009385 66FF05[664A0100]    <1> 	inc	word [argc] ; 11/05/2016
  5973                              <1> 
  5974                              <1> loc_load_and_run_file_2:
  5975 0000938C AC                  <1> 	lodsb
  5976 0000938D 3C20                <1> 	cmp	al, 20h
  5977 0000938F 7717                <1> 	ja	short loc_load_and_run_file_5	
  5978 00009391 721E                <1> 	jb	short loc_load_and_run_file_6
  5979                              <1> 
  5980                              <1> loc_load_and_run_file_3:
  5981 00009393 803E20              <1> 	cmp	byte [esi], 20h
  5982 00009396 7707                <1> 	ja	short loc_load_and_run_file_4
  5983 00009398 7217                <1> 	jb	short loc_load_and_run_file_6
  5984 0000939A 46                  <1> 	inc	esi
  5985 0000939B E2F6                <1> 	loop	loc_load_and_run_file_3
  5986 0000939D EB12                <1> 	jmp	short loc_load_and_run_file_6
  5987                              <1> 
  5988                              <1> loc_load_and_run_file_4:
  5989 0000939F 28C0                <1> 	sub	al, al ; 0
  5990 000093A1 66FF05[664A0100]    <1> 	inc	word [argc]
  5991                              <1> loc_load_and_run_file_5:
  5992 000093A8 AA                  <1> 	stosb
  5993 000093A9 FF05[0C4A0100]      <1> 	inc	dword [u.nread]
  5994 000093AF E2DB                <1> 	loop	loc_load_and_run_file_2
  5995                              <1> 			
  5996                              <1> loc_load_and_run_file_6:
  5997 000093B1 30C0                <1> 	xor	al, al ; 0
  5998 000093B3 AA                  <1> 	stosb
  5999 000093B4 FF05[0C4A0100]      <1> 	inc	dword [u.nread]
  6000                              <1> loc_load_and_run_file_7:
  6001 000093BA 8807                <1> 	mov 	[edi], al ; 0
  6002 000093BC 66FF05[664A0100]    <1> 	inc	word [argc] ; 24/04/2016
  6003 000093C3 FF05[0C4A0100]      <1> 	inc	dword [u.nread] ; 24/04/2016
  6004 000093C9 BE[6E350100]        <1> 	mov	esi, TextBuffer
  6005 000093CE 8B15[803E0100]      <1> 	mov	edx, [FindFile_DirEntry+DirEntry_FileSize]
  6006 000093D4 66A1[783E0100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusHI]
  6007 000093DA 66C1E010            <1> 	shl	ax, 16
  6008 000093DE 66A1[7E3E0100]      <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 000093E4 E8D2440000          <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 000093E9 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 000093EE 30E4                <1> 	xor	ah, ah
  6037                              <1> loc_run_check_filename_ext:	
  6038 000093F0 AC                  <1> 	lodsb
  6039 000093F1 3C21                <1> 	cmp	al, 21h
  6040 000093F3 7229                <1> 	jb	short loc_check_exe_fn_retn 
  6041 000093F5 FEC4                <1> 	inc	ah
  6042 000093F7 3C2E                <1> 	cmp	al, '.'
  6043 000093F9 75F5                <1> 	jne	short loc_run_check_filename_ext	
  6044                              <1> 		 
  6045                              <1> loc_run_check_filename_ext_dot:
  6046 000093FB 80FC02              <1> 	cmp	ah, 2 ; .??? is not valid
  6047 000093FE 88C4                <1> 	mov	ah, al ; '.' 
  6048 00009400 7219                <1> 	jb	short loc_check_prg_fn_retn
  6049                              <1> 
  6050                              <1> loc_run_check_filename_ext_dot_ok:
  6051 00009402 AC                  <1> 	lodsb
  6052 00009403 24DF                <1> 	and	al, 0DFh 
  6053                              <1> 
  6054                              <1> loc_run_check_filename_ext_prg:
  6055 00009405 3C50                <1> 	cmp	al, 'P'
  6056 00009407 7212                <1> 	jb	short loc_check_prg_fn_retn
  6057 00009409 7711                <1> 	ja	short loc_check_prg_fn_stc
  6058 0000940B AC                  <1> 	lodsb
  6059 0000940C 24DF                <1> 	and	al, 0DFh 
  6060 0000940E 3C52                <1> 	cmp	al, 'R'
  6061 00009410 750A                <1> 	jne	short loc_check_prg_fn_stc
  6062 00009412 AC                  <1> 	lodsb
  6063 00009413 24DF                <1> 	and	al, 0DFh
  6064 00009415 3C47                <1> 	cmp	al, 'G'
  6065 00009417 7503                <1> 	jne	short loc_check_prg_fn_stc
  6066                              <1> 
  6067 00009419 B050                <1> 	mov	al, 'P'
  6068                              <1> loc_check_prg_fn_retn:
  6069 0000941B C3                  <1> 	retn
  6070                              <1> 
  6071                              <1> loc_check_prg_fn_stc:
  6072 0000941C F9                  <1> 	stc
  6073 0000941D C3                  <1> 	retn
  6074                              <1>  
  6075                              <1> loc_check_exe_fn_retn:
  6076 0000941E 28C0                <1> 	sub	al, al ; 0
  6077 00009420 C3                  <1> 	retn
  6078                              <1>               
  6079                              <1> find_and_list_files:
  6080 00009421 C3                  <1> 	retn
  6081                              <1> set_exec_arguments:
  6082 00009422 C3                  <1> 	retn
  6083                              <1> delete_fs_directory:
  6084 00009423 31C0                <1> 	xor eax, eax
  6085 00009425 C3                  <1> 	retn
  2157                                  %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 00009426 BE[CF3C0100]        <1> 	mov	esi, PATH_Array
    28                              <1> change_prompt_dir_str: ; 05/10/2016 (call from 'set_working_path')
    29 0000942B BF[72340100]        <1> 	mov	edi, Current_Directory
    30 00009430 8A25[6C340100]      <1> 	mov	ah, [Current_Dir_Level]
    31 00009436 E807000000          <1> 	call	set_current_directory_string
    32 0000943B 880D[CD340100]      <1> 	mov	[Current_Dir_StrLen], cl
    33                              <1> 
    34 00009441 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 00009442 57                  <1> 	push    edi
    49 00009443 80FC00              <1> 	cmp     ah, 0
    50 00009446 7652                <1> 	jna	short pass_write_path
    51 00009448 83C610              <1> 	add	esi, 16
    52 0000944B 89F3                <1> 	mov	ebx, esi
    53                              <1> loc_write_path:
    54 0000944D B908000000          <1> 	mov	ecx, 8
    55                              <1> path_write_dirname1:
    56 00009452 AC                  <1> 	lodsb
    57 00009453 3C20                <1> 	cmp	al, 20h
    58 00009455 7612                <1> 	jna	short pass_write_dirname1
    59 00009457 AA                  <1> 	stosb
    60 00009458 81FF[CC340100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    61 0000945E 733A                <1> 	jnb	short pass_write_path
    62 00009460 E2F0                <1> 	loop	path_write_dirname1
    63 00009462 803E20              <1> 	cmp	byte [esi], 20h
    64 00009465 7624                <1> 	jna	short pass_write_dirname2
    65 00009467 EB0A                <1> 	jmp     short loc_put_dot_cont_ext
    66                              <1> pass_write_dirname1:
    67 00009469 89DE                <1> 	mov	esi, ebx
    68 0000946B 83C608              <1> 	add	esi, 8
    69 0000946E 803E20              <1> 	cmp	byte [esi], 20h
    70 00009471 7618                <1> 	jna	short pass_write_dirname2
    71                              <1> loc_put_dot_cont_ext:
    72 00009473 C6072E              <1> 	mov	byte [edi], "."
    73                              <1> 	;mov	ecx, 3
    74 00009476 B103                <1> 	mov	cl, 3
    75                              <1> loc_check_dir_name_ext:
    76 00009478 AC                  <1> 	lodsb
    77 00009479 47                  <1> 	inc	edi
    78 0000947A 3C20                <1> 	cmp	al, 20h
    79 0000947C 760D                <1> 	jna	short pass_write_dirname2
    80 0000947E 8807                <1> 	mov	[edi], al
    81 00009480 81FF[CC340100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    82 00009486 7312                <1> 	jnb	short pass_write_path
    83 00009488 E2EE                <1> 	loop    loc_check_dir_name_ext
    84 0000948A 47                  <1> 	inc	edi
    85                              <1> pass_write_dirname2:
    86 0000948B FECC                <1> 	dec	ah
    87 0000948D 740B                <1> 	jz      short pass_write_path
    88 0000948F 83C310              <1> 	add	ebx, 16
    89 00009492 89DE                <1> 	mov	esi, ebx
    90 00009494 C6072F              <1> 	mov	byte [edi],"/"
    91 00009497 47                  <1> 	inc	edi
    92 00009498 EBB3                <1> 	jmp	short loc_write_path
    93                              <1> pass_write_path:
    94 0000949A C60700              <1> 	mov	byte [edi], 0
    95 0000949D 47                  <1> 	inc	edi
    96 0000949E 89F9                <1> 	mov	ecx, edi
    97 000094A0 5F                  <1> 	pop	edi
    98 000094A1 29F9                <1> 	sub	ecx, edi
    99                              <1> 	; ECX = Current Directory String Length
   100 000094A3 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 000094A4 80FA00              <1> 	cmp	dl, 0
   125 000094A7 7708                <1> 	ja	short loc_get_current_drive_1
   126 000094A9 8A15[6E340100]      <1> 	mov	dl, [Current_Drv]
   127 000094AF EB17                <1> 	jmp	short loc_get_current_drive_2
   128                              <1> loc_get_current_drive_1:
   129 000094B1 FECA                <1> 	dec 	dl
   130 000094B3 3A15[14F00000]      <1> 	cmp	dl, [Last_DOS_DiskNo]
   131 000094B9 760D                <1> 	jna	short loc_get_current_drive_2
   132 000094BB B80F000000          <1> 	mov	eax, 0Fh ; Invalid drive (Drive not ready!)
   133 000094C0 F5                  <1> 	cmc 	; stc
   134 000094C1 C3                  <1> 	retn
   135                              <1> 
   136                              <1> loc_get_current_drive_not_ready_retn:
   137 000094C2 5E                  <1> 	pop	esi
   138                              <1> 	;mov	eax, 15
   139 000094C3 66B80F00            <1> 	mov	ax, 15 ; Drive not ready
   140 000094C7 C3                  <1> 	retn  
   141                              <1>  
   142                              <1> loc_get_current_drive_2:
   143 000094C8 31C0                <1> 	xor	eax, eax
   144 000094CA 88D4                <1> 	mov	ah, dl
   145 000094CC 56                  <1> 	push	esi
   146 000094CD BE00010900          <1> 	mov	esi, Logical_DOSDisks
   147 000094D2 01C6                <1> 	add	esi, eax
   148 000094D4 8A06                <1> 	mov	al, [esi+LD_Name] 
   149 000094D6 3C41                <1> 	cmp	al, 'A'
   150 000094D8 72E8                <1> 	jb	short loc_get_current_drive_not_ready_retn
   151                              <1> 
   152 000094DA 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   153 000094DD 08E4                <1> 	or	ah, ah
   154 000094DF 7506                <1> 	jnz	short loc_get_current_drive_3
   155                              <1> 
   156                              <1> 	;xor	ah, ah ; mov ah, 0
   157 000094E1 8826                <1> 	mov	[esi], ah
   158 000094E3 31C9                <1> 	xor	ecx, ecx
   159 000094E5 EB1C                <1> 	jmp	short loc_get_current_drive_4
   160                              <1> 
   161                              <1> loc_get_current_drive_3:
   162 000094E7 BF[CF3C0100]        <1>         mov     edi, PATH_Array
   163 000094EC 57                  <1> 	push	edi
   164 000094ED 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   165 000094F3 B920000000          <1> 	mov	ecx, 32
   166 000094F8 F3A5                <1> 	rep	movsd
   167 000094FA 5E                  <1> 	pop	esi ; Path Array Address
   168 000094FB 5F                  <1> 	pop	edi ; pushed esi (current dir buffer offset) 
   169                              <1> 	;
   170 000094FC E841FFFFFF          <1> 	call	set_current_directory_string
   171 00009501 89FE                <1> 	mov	esi, edi
   172                              <1> 
   173                              <1> loc_get_current_drive_4:
   174 00009503 30C0                <1> 	xor	al, al
   175 00009505 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 00009506 8825[5D3D0100]      <1> 	mov	[CD_COMMAND], ah
   200 0000950C 803E2F              <1> 	cmp	byte [esi], '/'
   201 0000950F 7505                <1> 	jne	short loc_ccd_cdir_level
   202 00009511 46                  <1> 	inc	esi
   203 00009512 30C0                <1> 	xor	al, al
   204 00009514 EB05                <1> 	jmp	short loc_ccd_parse_path_name
   205                              <1> loc_ccd_cdir_level:
   206 00009516 A0[6C340100]        <1> 	mov	al, [Current_Dir_Level]
   207                              <1> loc_ccd_parse_path_name:
   208 0000951B 88C4                <1> 	mov	ah, al
   209 0000951D BF[CF3C0100]        <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 00009522 0FB6C8              <1> 	movzx	ecx, al
   221 00009525 FEC1                <1> 	inc	cl
   222 00009527 C0E104              <1> 	shl	cl, 4
   223 0000952A 01CF                <1> 	add	edi, ecx
   224 0000952C B107                <1> 	mov	cl, 7
   225 0000952E 28C1                <1> 	sub	cl, al
   226 00009530 C0E102              <1> 	shl	cl, 2
   227 00009533 89C3                <1> 	mov	ebx, eax
   228 00009535 31C0                <1> 	xor	eax, eax ; 0
   229 00009537 F3AB                <1> 	rep	stosd
   230 00009539 89D8                <1> 	mov	eax, ebx
   231                              <1> 
   232 0000953B BF[CF3C0100]        <1> 	mov	edi, PATH_Array
   233                              <1> 
   234 00009540 803E20              <1> 	cmp	byte [esi], 20h
   235 00009543 F5                  <1> 	cmc
   236 00009544 7305                <1> 	jnc	short pass_ccd_parse_dir_name
   237                              <1> 
   238                              <1> 		; ESI = Path name
   239                              <1> 		; AL = CCD_Level
   240 00009546 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 0000954B 9C                  <1> 	pushf
   247                              <1> 
   248                              <1> 	;mov	[CCD_Level], al
   249                              <1>         ;mov	[Last_Dir_Level], ah
   250 0000954C 66A3[533D0100]      <1> 	mov	[CCD_Level], ax
   251                              <1> 
   252 00009552 31DB                <1> 	xor	ebx, ebx
   253 00009554 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
   254 0000955A BE00010900          <1> 	mov	esi, Logical_DOSDisks
   255 0000955F 01DE                <1> 	add	esi, ebx
   256                              <1> 
   257 00009561 9D                  <1> 	popf 
   258 00009562 720A                <1> 	jc	short loc_ccd_bad_path_name_retn
   259                              <1> 
   260 00009564 8935[4F3D0100]      <1> 	mov	[CCD_DriveDT], esi
   261                              <1> 
   262 0000956A 3C07                <1> 	cmp	al, 7
   263 0000956C 7209                <1> 	jb	short loc_ccd_load_child_dir
   264                              <1> 
   265                              <1> loc_ccd_bad_path_name_retn:
   266 0000956E 87F7                <1> 	xchg	esi, edi
   267 00009570 B813000000          <1> 	mov	eax, 19 ; Bad directory/path name 
   268 00009575 F9                  <1> 	stc
   269                              <1> loc_ccd_retn_p:
   270 00009576 C3                  <1> 	retn
   271                              <1> 
   272                              <1> loc_ccd_load_child_dir:
   273                              <1> 	; AL = CCD_Level
   274 00009577 08C0                <1> 	or	al, al
   275 00009579 7468                <1> 	jz	short loc_ccd_load_root_dir
   276                              <1> 
   277 0000957B 6689C1              <1> 	mov	cx, ax
   278 0000957E C0E004              <1> 	shl	al, 4
   279 00009581 0FB6F0              <1> 	movzx	esi, al
   280 00009584 01FE                <1>      	add	esi, edi  ; offset PATH_Array
   281                              <1> 
   282 00009586 8B460C              <1> 	mov	eax, [esi+12]
   283 00009589 38E9                <1> 	cmp	cl, ch
   284 0000958B 0F84FA000000        <1>         je      loc_ccd_load_sub_directory
   285 00009591 A3[68340100]        <1> 	mov	[Current_Dir_FCluster], eax
   286                              <1> 
   287                              <1> loc_ccd_load_child_dir_next:
   288 00009596 83C610              <1> 	add	esi, 16 ; DOS DirEntry Format FileName Address
   289                              <1> 
   290                              <1>  	; Directory attribute : 10h
   291 00009599 B010                <1> 	mov	al, 00010000b ; 10h (Attrib AND mask)
   292                              <1> 	;mov	ah, 11001000b ; C8h
   293                              <1> 	; Volume name attribute: 8h
   294 0000959B B408                <1> 	mov	ah, 00001000b ; 08h (Attrib NAND, AND --> zero mask)
   295                              <1> 
   296 0000959D 6631C9              <1> 	xor	cx, cx  
   297 000095A0 E8B5010000          <1> 	call	locate_current_dir_file
   298 000095A5 7353                <1> 	jnc	short loc_ccd_set_dir_cluster_ptr
   299                              <1> 
   300                              <1> 	 ; 19/02/2016
   301                              <1> 	;mov	edi, [CCD_DriveDT]
   302 000095A7 8A25[533D0100]      <1> 	mov	ah, [CCD_Level]
   303 000095AD 803D[5D3D0100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   304 000095B4 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 000095B6 88E1                <1> 	mov	cl, ah
   310 000095B8 50                  <1> 	push	eax
   311 000095B9 E8E3000000          <1> 	call	loc_ccd_save_current_dir
   312 000095BE 58                  <1> 	pop	eax
   313                              <1> loc_ccd_load_child_dir_err:            
   314 000095BF 3C03                <1> 	cmp	al, 3	; AL = 2 => File not found error
   315 000095C1 7202                <1> 	jb	short loc_ccd_path_not_found_retn
   316 000095C3 F9                  <1> 	stc
   317 000095C4 C3                  <1> 	retn
   318                              <1> 
   319                              <1> loc_ccd_path_not_found_retn:
   320 000095C5 B003                <1> 	mov	al, 3	; Path not found
   321 000095C7 C3                  <1> 	retn
   322                              <1> 
   323                              <1> loc_ccd_load_FAT_root_dir:
   324 000095C8 803D[6D340100]02    <1> 	cmp	byte [Current_FATType], 2
   325 000095CF 776B                <1> 	ja	short loc_ccd_load_FAT32_root_dir
   326                              <1> 
   327                              <1> 	;mov	esi, [CCD_DriveDT]
   328                              <1> 	;push	esi
   329 000095D1 E8B61D0000          <1> 	call	load_FAT_root_directory
   330                              <1> 	;pop	edi ; Dos Drv Description Table
   331                              <1> 
   332 000095D6 89F7                <1> 	mov	edi, esi
   333 000095D8 BE[CF3C0100]        <1> 	mov	esi, PATH_Array
   334 000095DD 7297                <1> 	jc	short loc_ccd_retn_p
   335                              <1> 
   336 000095DF 31C0                <1> 	xor	eax, eax
   337 000095E1 EB78                <1>         jmp	short loc_ccd_set_cdfc
   338                              <1> 
   339                              <1> loc_ccd_load_root_dir:
   340 000095E3 803D[6D340100]01    <1> 	cmp	byte [Current_FATType], 1
   341 000095EA 73DC                <1> 	jnb	short loc_ccd_load_FAT_root_dir
   342                              <1> 
   343                              <1> loc_ccd_load_FS_root_dir:
   344 000095EC E8621E0000          <1> 	call	load_FS_root_directory
   345 000095F1 EB5C                <1> 	jmp	short pass_ccd_load_FAT_sub_directory
   346                              <1> 
   347                              <1> loc_ccd_load_FS_sub_directory_next:
   348 000095F3 E85C1E0000          <1> 	call	load_FS_sub_directory
   349 000095F8 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 000095FA 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
   354 000095FE C1E010              <1> 	shl	eax, 16
   355 00009601 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
   356                              <1> 
   357 00009605 8B35[4F3D0100]      <1> 	mov	esi, [CCD_DriveDT]
   358 0000960B 803D[6D340100]01    <1> 	cmp	byte [Current_FATType], 1
   359 00009612 72DF                <1> 	jb	short loc_ccd_load_FS_sub_directory_next
   360                              <1> 	;push	esi
   361 00009614 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 00009619 BE[CF3C0100]        <1> 	mov	esi, PATH_Array
   367 0000961E 7264                <1> 	jc	short loc_ccd_retn_c
   368                              <1> 
   369 00009620 A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
   370                              <1> 
   371 00009625 FE05[533D0100]      <1> 	inc	byte [CCD_Level]
   372 0000962B 0FB61D[533D0100]    <1> 	movzx	ebx, byte [CCD_Level]
   373 00009632 C0E304              <1> 	shl	bl, 4 ; * 16 (<= 128)   
   374 00009635 01DE                <1> 	add	esi, ebx ; 19/02/2016
   375 00009637 89460C              <1> 	mov	[esi+12], eax
   376 0000963A EB1F                <1> 	jmp	short loc_ccd_set_cdfc
   377                              <1> 
   378                              <1> loc_ccd_load_FAT32_root_dir:
   379 0000963C BE[CF3C0100]        <1> 	mov	esi, PATH_Array
   380 00009641 8B460C              <1> 	mov	eax, [esi+12]
   381 00009644 8B35[4F3D0100]      <1> 	mov	esi, [CCD_DriveDT]
   382                              <1>  
   383                              <1> loc_ccd_load_FAT_sub_directory:
   384                              <1> 	;push	esi
   385 0000964A 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 0000964F BE[CF3C0100]        <1> 	mov	esi, PATH_Array
   391 00009654 722E                <1> 	jc	short loc_ccd_retn_c
   392                              <1> 
   393 00009656 A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
   394                              <1> 
   395                              <1> loc_ccd_set_cdfc:
   396 0000965B 8A0D[533D0100]      <1> 	mov	cl, [CCD_Level]
   397 00009661 880D[6C340100]      <1> 	mov	[Current_Dir_Level], cl
   398 00009667 A3[68340100]        <1> 	mov	[Current_Dir_FCluster], eax
   399                              <1> 
   400 0000966C 8A2D[543D0100]      <1> 	mov	ch, [Last_Dir_Level]
   401 00009672 38E9                <1> 	cmp	cl, ch 
   402 00009674 0F821CFFFFFF        <1> 	jb	loc_ccd_load_child_dir_next
   403                              <1> 	
   404 0000967A 803D[5D3D0100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   405 00009681 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 00009683 F8                  <1> 	clc
   411                              <1> 
   412                              <1> loc_ccd_retn_c:
   413 00009684 8B3D[4F3D0100]      <1> 	mov	edi, [CCD_DriveDT]
   414 0000968A C3                  <1> 	retn
   415                              <1> 
   416                              <1> loc_ccd_load_sub_directory:
   417 0000968B 8B35[4F3D0100]      <1> 	mov	esi, [CCD_DriveDT]
   418 00009691 803D[6D340100]01    <1> 	cmp	byte [Current_FATType], 1
   419 00009698 73B0                <1> 	jnb	short loc_ccd_load_FAT_sub_directory 
   420 0000969A E8B51D0000          <1> 	call	load_FS_sub_directory
   421 0000969F EBAE                <1> 	jmp	short pass_ccd_load_FAT_sub_directory 
   422                              <1> 
   423                              <1> loc_ccd_save_current_dir:
   424 000096A1 BE[CF3C0100]        <1> 	mov	esi, PATH_Array ; 19/02/2016
   425 000096A6 8B3D[4F3D0100]      <1> 	mov	edi, [CCD_DriveDT]
   426 000096AC 57                  <1> 	push	edi
   427 000096AD 83C77F              <1>         add     edi, LD_CDirLevel
   428 000096B0 880F                <1> 	mov	[edi], cl
   429 000096B2 47                  <1> 	inc	edi ; LD_CurrentDirectory 
   430 000096B3 56                  <1> 	push	esi
   431                              <1> 	;mov	ecx, 32  ; always < 65536 (in this procedure)
   432 000096B4 66B92000            <1> 	mov	cx, 32
   433 000096B8 F3A5                <1> 	rep	movsd
   434                              <1> 	; Current directory has been saved to 
   435                              <1> 	; the DOS drive description table, cdir area !
   436 000096BA 5E                  <1> 	pop	esi  ; PATH_Array
   437 000096BB 5F                  <1> 	pop	edi  ; Dos Drv Description Table
   438                              <1> 
   439 000096BC 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 000096BD 88C4                <1> 	mov	ah, al
   462 000096BF 66A3[F43D0100]      <1> 	mov	[PATH_CDLevel], ax
   463                              <1> repeat_ppdn_check_slash:
   464 000096C5 AC                  <1> 	lodsb
   465 000096C6 3C2F                <1> 	cmp	al, '/'
   466 000096C8 74FB                <1> 	je	short repeat_ppdn_check_slash
   467 000096CA 3C21                <1> 	cmp	al, 21h
   468 000096CC 7219                <1> 	jb	short loc_ppdn_retn
   469 000096CE 57                  <1> 	push	edi
   470                              <1> loc_ppdn_get_dir_name:
   471 000096CF B90C000000          <1> 	mov	ecx, 12
   472 000096D4 BF[F63D0100]        <1> 	mov	edi, Dir_File_Name
   473                              <1> repeat_ppdn_get_dir_name:
   474 000096D9 AA                  <1> 	stosb
   475 000096DA AC                  <1> 	lodsb
   476 000096DB 3C2F                <1> 	cmp	al, '/'
   477 000096DD 740A                <1> 	je	short loc_check_level_dot_conv_dir_name
   478 000096DF 3C20                <1> 	cmp	al, 20h
   479 000096E1 7605                <1> 	jna	short loc_ppdn_end_of_path_scan
   480 000096E3 E2F4                <1> 	loop	repeat_ppdn_get_dir_name
   481 000096E5 5F                  <1> 	pop	edi
   482 000096E6 F9                  <1> 	stc
   483                              <1> loc_ppdn_retn:
   484 000096E7 C3                  <1> 	retn
   485                              <1> 
   486                              <1> loc_ppdn_end_of_path_scan:
   487 000096E8 4E                  <1> 	dec	esi
   488                              <1> loc_check_level_dot_conv_dir_name:
   489 000096E9 31C0                <1> 	xor	eax, eax
   490 000096EB AA                  <1> 	stosb
   491 000096EC 89F3                <1> 	mov	ebx, esi
   492 000096EE BE[F63D0100]        <1> 	mov	esi, Dir_File_Name
   493 000096F3 AC                  <1> 	lodsb
   494                              <1> repeat_ppdn_name_check_dot:
   495 000096F4 3C2E                <1> 	cmp	al, '.'
   496 000096F6 7509                <1> 	jne	short loc_ppdn_convert_sub_dir_name
   497                              <1> repeat_ppdn_name_dot_dot:
   498 000096F8 AC                  <1> 	lodsb
   499 000096F9 3C2E                <1> 	cmp	al, '.'
   500 000096FB 743E                <1> 	je	short loc_ppdn_dot_dot
   501 000096FD 3C21                <1> 	cmp	al, 21h
   502 000096FF 7226                <1> 	jb	short pass_ppdn_convert_sub_dir_name
   503                              <1> loc_ppdn_convert_sub_dir_name:
   504 00009701 8A25[F53D0100]      <1> 	mov	ah, [PATH_Level]
   505 00009707 80FC07              <1> 	cmp	ah, 7
   506 0000970A 731B                <1> 	jnb	short pass_ppdn_convert_sub_dir_name
   507 0000970C FEC4                <1> 	inc	ah  
   508 0000970E 8825[F53D0100]      <1> 	mov	[PATH_Level], ah
   509 00009714 BE[F63D0100]        <1> 	mov	esi, Dir_File_Name
   510                              <1> 	;mov	edi, [PATH_Array_Ptr]
   511 00009719 B010                <1> 	mov	al, 16
   512 0000971B F6E4                <1> 	mul	ah
   513 0000971D 8B3C24              <1> 	mov	edi, [esp]
   514                              <1> 	;push	edi 
   515 00009720 01C7                <1> 	add	edi, eax
   516 00009722 E828030000          <1> 	call	convert_file_name
   517                              <1> 	;pop	edi
   518                              <1> pass_ppdn_convert_sub_dir_name:
   519 00009727 89DE                <1> 	mov	esi, ebx
   520                              <1> repeat_ppdn_check_last_slash:
   521 00009729 AC                  <1> 	lodsb
   522 0000972A 3C2F                <1> 	cmp	al, '/'
   523 0000972C 74FB                <1> 	je	short repeat_ppdn_check_last_slash
   524 0000972E 3C21                <1> 	cmp	al, 21h
   525 00009730 739D                <1> 	jnb	short loc_ppdn_get_dir_name
   526                              <1> end_of_parse_dir_name:
   527 00009732 5F                  <1> 	pop	edi
   528 00009733 F5                  <1> 	cmc  
   529                              <1> 	;mov	al, [PATH_CDLevel]
   530                              <1> 	;mov	ah, [PATH_Level]
   531 00009734 66A1[F43D0100]      <1> 	mov	ax, [PATH_CDLevel]
   532 0000973A C3                  <1> 	retn
   533                              <1> 
   534                              <1> loc_ppdn_dot_dot:
   535 0000973B AC                  <1> 	lodsb
   536 0000973C 3C21                <1> 	cmp	al, 21h
   537 0000973E 73F2                <1> 	jnb	short end_of_parse_dir_name 
   538                              <1> loc_ppdn_dot_dot_prev_level:
   539 00009740 66A1[F43D0100]      <1> 	mov	ax, [PATH_CDLevel]
   540 00009746 80EC01              <1> 	sub	ah, 1
   541 00009749 80D400              <1> 	adc	ah, 0
   542 0000974C 38E0                <1> 	cmp	al, ah
   543 0000974E 7602                <1> 	jna	short pass_ppdn_set_al_to_ah
   544 00009750 88E0                <1> 	mov	al, ah
   545                              <1> pass_ppdn_set_al_to_ah:
   546 00009752 66A3[F43D0100]      <1> 	mov	[PATH_CDLevel], ax
   547 00009758 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 0000975A 8935[573D0100]      <1> 	mov	[CDLF_FNAddress], esi
   592 00009760 66A3[553D0100]      <1> 	mov	[CDLF_AttributesMask], ax
   593 00009766 66890D[5B3D0100]    <1> 	mov	[CDLF_DEType], cx
   594                              <1> 
   595 0000976D 31DB                <1> 	xor	ebx, ebx
   596 0000976F 881D[6C3D0100]      <1> 	mov	[PreviousAttr], bl ; 0  ; 13/02/2016
   597                              <1> 
   598 00009775 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
   599 0000977B 381D[983C0100]      <1> 	cmp	byte [DirBuff_ValidData], bl ; 0
   600 00009781 761D                <1> 	jna	short loc_lcdf_reload_current_dir2
   601 00009783 8A1D[963C0100]      <1>         mov     bl, [DirBuff_DRV]
   602 00009789 80EB41              <1> 	sub	bl, 'A'
   603 0000978C 38DF                <1> 	cmp	bh, bl
   604 0000978E 750E                <1> 	jne	short loc_lcdf_reload_current_dir1
   605 00009790 8B15[9D3C0100]      <1> 	mov	edx, [DirBuff_Cluster]
   606 00009796 3B15[68340100]      <1> 	cmp	edx, [Current_Dir_FCluster]
   607 0000979C 7412                <1> 	je	short loc_cdir_locatefile_search
   608                              <1> 
   609                              <1> loc_lcdf_reload_current_dir1:
   610 0000979E 30DB                <1> 	xor	bl, bl
   611                              <1> loc_lcdf_reload_current_dir2:
   612 000097A0 89DE                <1> 	mov	esi, ebx
   613 000097A2 81C600010900        <1>         add     esi, Logical_DOSDisks
   614 000097A8 E872000000          <1> 	call	reload_current_directory 
   615 000097AD 735B                <1> 	jnc	short loc_locatefile_search_again 
   616 000097AF C3                  <1> 	retn  
   617                              <1> 
   618                              <1> loc_cdir_locatefile_search:
   619 000097B0 31DB                <1> 	xor	ebx, ebx
   620 000097B2 E8A5000000          <1> 	call	find_directory_entry
   621 000097B7 7349                <1> 	jnc	short loc_cdir_locate_file_retn
   622                              <1> 
   623                              <1> loc_locatefile_check_stc_reason:
   624 000097B9 08ED                <1> 	or	ch, ch
   625 000097BB 7444                <1> 	jz	short loc_cdir_locate_file_stc_retn
   626                              <1> 
   627                              <1> loc_locatefile_check_next_entryblock:
   628 000097BD 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
   629 000097C3 28DB                <1> 	sub	bl, bl
   630 000097C5 0FB7F3              <1> 	movzx	esi, bx
   631 000097C8 81C600010900        <1>         add     esi, Logical_DOSDisks
   632                              <1> 
   633 000097CE 803D[6C340100]00    <1> 	cmp	byte [Current_Dir_Level], 0
   634 000097D5 760A                <1> 	jna	short loc_locatefile_check_FAT_type
   635                              <1>             
   636 000097D7 803D[6D340100]01    <1> 	cmp	byte [Current_FATType], 1
   637 000097DE 730A                <1> 	jnb	short loc_locatefile_load_subdir_cluster
   638 000097E0 C3                  <1> 	retn  
   639                              <1> 
   640                              <1> loc_locatefile_check_FAT_type:
   641 000097E1 803D[6D340100]03    <1> 	cmp	byte [Current_FATType], 3
   642 000097E8 7218                <1> 	jb	short loc_cdir_locate_file_retn
   643                              <1> 
   644                              <1> loc_locatefile_load_subdir_cluster:
   645 000097EA A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
   646 000097EF E83D1A0000          <1> 	call	get_next_cluster
   647 000097F4 730D                <1> 	jnc	short loc_locatefile_next_cluster
   648 000097F6 09C0                <1> 	or	eax, eax
   649 000097F8 7507                <1> 	jnz	short loc_locatefile_drive_not_ready_read_err
   650 000097FA F9                  <1> 	stc
   651                              <1> loc_locatefile_file_notfound:
   652 000097FB B802000000          <1> 	mov	eax, 2 ; File/Directory/VolName not found
   653 00009800 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 00009801 F5                  <1> 	cmc ;stc
   659                              <1> loc_cdir_locate_file_retn:
   660 00009802 C3                  <1> 	retn
   661                              <1> 
   662                              <1> loc_locatefile_next_cluster:
   663 00009803 E80F1C0000          <1> 	call	load_FAT_sub_directory
   664                              <1> 	;jc	short loc_locatefile_drive_not_ready_read_err
   665 00009808 72F8                <1> 	jc	short loc_cdir_locate_file_retn 
   666                              <1> 
   667                              <1> loc_locatefile_search_again:
   668 0000980A 8B35[573D0100]      <1> 	mov	esi, [CDLF_FNAddress] 
   669 00009810 66A1[553D0100]      <1> 	mov	ax, [CDLF_AttributesMask]
   670 00009816 668B0D[5B3D0100]    <1> 	mov	cx, [CDLF_DEType] 
   671 0000981D 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 0000981F A0[6D340100]        <1> 	mov	al, [Current_FATType]
   683 00009824 3C02                <1> 	cmp	al, 2
   684 00009826 7729                <1> 	ja	short loc_reload_FAT_sub_directory
   685 00009828 8A25[6C340100]      <1> 	mov	ah, [Current_Dir_Level]
   686 0000982E 08C0                <1> 	or	al, al
   687 00009830 740A                <1> 	jz	short loc_reload_FS_directory
   688 00009832 08E4                <1> 	or	ah, ah
   689 00009834 751B                <1> 	jnz	short loc_reload_FAT_sub_directory
   690                              <1> loc_reload_FAT_12_16_root_directory:
   691 00009836 E8511B0000          <1> 	call	load_FAT_root_directory
   692 0000983B C3                  <1> 	retn
   693                              <1> loc_reload_FS_directory:
   694 0000983C 20E4                <1> 	and	ah, ah
   695 0000983E 7506                <1> 	jnz	short loc_reload_FS_sub_directory 
   696                              <1> loc_reload_FS_root_directory: 
   697 00009840 E80E1C0000          <1> 	call	load_FS_root_directory
   698 00009845 C3                  <1> 	retn
   699                              <1> loc_reload_FS_sub_directory:
   700 00009846 A1[68340100]        <1> 	mov	eax, [Current_Dir_FCluster]
   701 0000984B E8041C0000          <1> 	call	load_FS_sub_directory
   702 00009850 C3                  <1> 	retn 
   703                              <1> loc_reload_FAT_sub_directory:
   704 00009851 A1[68340100]        <1> 	mov	eax, [Current_Dir_FCluster]
   705 00009856 E8BC1B0000          <1> 	call	load_FAT_sub_directory
   706 0000985B 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 0000985C 663B1D[9B3C0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   752 00009863 0F8739010000        <1>         ja      loc_ffde_stc_retn_255
   753                              <1> 
   754                              <1> 	;mov    [DirBuff_CurrentEntry], bx  
   755                              <1> 
   756 00009869 BF00000800          <1>   	mov	edi, Directory_Buffer
   757 0000986E 66A3[683D0100]      <1> 	mov	[FDE_AttrMask], ax
   758                              <1> 
   759 00009874 29C0                <1> 	sub	eax, eax
   760                              <1>             
   761                              <1> 	;;mov	[PreviousAttr], al ; 0 ;; 13/02/2016
   762 00009876 66A3[6A3D0100]      <1> 	mov	[AmbiguousFileName], ax ; 0
   763                              <1> 
   764 0000987C 6689D8              <1> 	mov	ax, bx
   765 0000987F 66C1E005            <1> 	shl	ax, 5 ; ; * 32 ; Directory entry size
   766 00009883 01C7                <1> 	add     edi, eax
   767                              <1> 
   768 00009885 08ED                <1> 	or	ch, ch
   769 00009887 0F852C010000        <1>         jnz     loc_find_free_deleted_entry_0
   770                              <1> 
   771 0000988D 08C9                <1> 	or      cl, cl
   772 0000988F 0F850D010000        <1>         jnz     loc_ffde_stc_retn_255
   773                              <1>  
   774                              <1> check_find_dir_entry:
   775 00009895 66A1[683D0100]      <1> 	mov	ax, [FDE_AttrMask]
   776 0000989B 8A2F                <1> 	mov	ch, [edi]
   777 0000989D 80FD00              <1> 	cmp     ch, 0 ; Is it never used entry?
   778 000098A0 0F86FF000000        <1> 	jna	loc_find_direntry_stc_retn 
   779 000098A6 56                  <1> 	push	esi
   780 000098A7 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   781 000098AA 80FDE5              <1> 	cmp	ch, 0E5h ; Is it a deleted file?
   782 000098AD 746D                <1> 	je	short loc_find_dir_next_entry_prevdeleted
   783                              <1> 
   784 000098AF 80FA0F              <1> 	cmp     dl, 0Fh ; longname sub component check
   785 000098B2 7505                <1> 	jne     short loc_check_attributes_mask
   786 000098B4 E8ED010000          <1> 	call	save_longname_sub_component
   787                              <1> 
   788                              <1> loc_check_attributes_mask:
   789 000098B9 88C6                <1> 	mov	dh, al
   790 000098BB 20D6                <1> 	and	dh, dl    
   791 000098BD 38F0                <1> 	cmp	al, dh
   792 000098BF 0F85BA000000        <1>         jne     loc_find_dir_next_entry
   793 000098C5 20D4                <1> 	and	ah, dl
   794 000098C7 0F85B2000000        <1>         jnz     loc_find_dir_next_entry
   795 000098CD 80FA0F              <1> 	cmp	dl, 0Fh
   796 000098D0 751A                <1> 	jne	short pass_direntry_attr_check
   797                              <1> 
   798 000098D2 3C0F                <1> 	cmp	al, 0Fh ; AL = 0Fh -> find long name
   799 000098D4 0F85A5000000        <1>         jne     loc_find_dir_next_entry
   800                              <1> 
   801 000098DA 5E                  <1> 	pop	esi
   802 000098DB 6631C0              <1> 	xor	ax, ax
   803 000098DE 8A35[6C3D0100]      <1> 	mov	dh, [PreviousAttr]
   804 000098E4 66891D[993C0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   805 000098EB C3                  <1> 	retn
   806                              <1> 
   807                              <1> pass_direntry_attr_check:
   808 000098EC 89FD                <1> 	mov	ebp, edi ; 14/02/2016
   809 000098EE B908000000          <1> 	mov	ecx, 8
   810                              <1> loc_lodsb_find_dir:
   811 000098F3 AC                  <1> 	lodsb
   812 000098F4 3C2A                <1> 	cmp	al, '*'
   813 000098F6 7508                <1> 	jne	short pass_fde_ambiguous1_check
   814 000098F8 FE05[6B3D0100]      <1>         inc     byte [AmbiguousFileName+1]
   815 000098FE EB28                <1> 	jmp	short loc_check_direntry_extension
   816                              <1> 
   817                              <1> pass_fde_ambiguous1_check:
   818 00009900 3C3F                <1> 	cmp	al, '?'
   819 00009902 750D                <1> 	jne	short pass_fde_ambiguous2_check
   820 00009904 FE05[6A3D0100]      <1> 	inc	byte [AmbiguousFileName]
   821 0000990A 803F20              <1> 	cmp	byte [edi], 20h
   822 0000990D 764E                <1> 	jna	short loc_find_dir_next_entry_ebp
   823 0000990F EB14                <1> 	jmp	short loc_scasb_find_dir_inc_di
   824                              <1> 
   825                              <1> pass_fde_ambiguous2_check:
   826 00009911 3C20                <1> 	cmp	al, 20h
   827 00009913 750C                <1> 	jne	short loc_scasb_find_dir
   828 00009915 803F20              <1> 	cmp	byte [edi], 20h
   829 00009918 7543                <1> 	jne	short loc_find_dir_next_entry_ebp
   830 0000991A EB0C                <1> 	jmp	short loc_check_direntry_extension
   831                              <1> 
   832                              <1> loc_find_dir_next_entry_prevdeleted:
   833 0000991C 80CA80              <1> 	or	dl, 80h  ; Bit 7 -> deleted entry sign
   834 0000991F EB5E                <1> 	jmp	short loc_find_dir_next_entry
   835                              <1> 
   836                              <1> loc_scasb_find_dir:
   837 00009921 3A07                <1> 	cmp	al, [edi]
   838 00009923 7538                <1> 	jne	short loc_find_dir_next_entry_ebp
   839                              <1> loc_scasb_find_dir_inc_di:
   840 00009925 47                  <1> 	inc	edi
   841 00009926 E2CB                <1> 	loop	loc_lodsb_find_dir
   842                              <1> 
   843                              <1> loc_check_direntry_extension:
   844 00009928 BE08000000          <1> 	mov	esi, 8
   845 0000992D 89F7                <1> 	mov	edi, esi ; 8
   846 0000992F 033424              <1> 	add	esi, [esp] ; Sub Dir or File Name Address
   847 00009932 01EF                <1> 	add	edi, ebp
   848 00009934 B103                <1> 	mov	cl, 3
   849                              <1> loc_lodsb_find_dir_ext:
   850 00009936 AC                  <1> 	lodsb
   851 00009937 3C2A                <1> 	cmp	al, '*'
   852 00009939 7508                <1> 	jne	short pass_fde_ambiguous3_check
   853 0000993B FE05[6B3D0100]      <1> 	inc	byte [AmbiguousFileName+1]
   854 00009941 EB1E                <1> 	jmp	short loc_find_dir_proper_direntry
   855                              <1> 
   856                              <1> pass_fde_ambiguous3_check:
   857 00009943 3C3F                <1> 	cmp	al, '?'
   858 00009945 750D                <1> 	jne	short pass_fde_ambiguous4_check
   859 00009947 FE05[6A3D0100]      <1> 	inc	byte [AmbiguousFileName]
   860 0000994D 803F20              <1> 	cmp	byte [edi], 20h
   861 00009950 760B                <1> 	jna	short loc_find_dir_next_entry_ebp
   862 00009952 EB49                <1> 	jmp	short loc_scasb_find_dir_ext_inc_di
   863                              <1> 
   864                              <1> pass_fde_ambiguous4_check:
   865 00009954 3C20                <1> 	cmp	al, 20h
   866 00009956 7541                <1> 	jne	short loc_scasb_find_dir_ext
   867 00009958 803F20              <1> 	cmp	byte [edi], 20h
   868 0000995B 7404                <1> 	je	short loc_find_dir_proper_direntry
   869                              <1> 
   870                              <1> loc_find_dir_next_entry_ebp:
   871 0000995D 89EF                <1> 	mov	edi, ebp ; 14/02/2016
   872 0000995F EB1E                <1> 	jmp	short loc_find_dir_next_entry
   873                              <1> 
   874                              <1> loc_find_dir_proper_direntry:
   875 00009961 30C9                <1> 	xor	cl, cl
   876                              <1> loc_find_dir_proper_direntry_1:
   877 00009963 5E                  <1> 	pop	esi
   878 00009964 89EF                <1>         mov     edi, ebp
   879 00009966 8A2F                <1> 	mov	ch, [edi]
   880 00009968 8A570B              <1> 	mov     dl, [edi+0Bh] ; Dir entry attributes
   881 0000996B 66A1[6A3D0100]      <1> 	mov	ax, [AmbiguousFileName]
   882                              <1> loc_find_dir_proper_direntry_2:
   883 00009971 8A35[6C3D0100]      <1> 	mov     dh, [PreviousAttr]
   884 00009977 66891D[993C0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   885 0000997E C3                  <1> 	retn
   886                              <1> 
   887                              <1> loc_find_dir_next_entry:
   888 0000997F 8815[6C3D0100]      <1> 	mov	byte [PreviousAttr], dl ; LongName check
   889                              <1> loc_find_dir_next_entry_1:
   890 00009985 5E                  <1> 	pop	esi
   891 00009986 83C720              <1> 	add	edi, 32
   892                              <1> 	;inc	word [DirBuff_EntryCounter]
   893 00009989 6643                <1> 	inc	bx
   894 0000998B 663B1D[9B3C0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   895 00009992 770E                <1> 	ja	short loc_ffde_stc_retn_255
   896 00009994 E9FCFEFFFF          <1>         jmp     check_find_dir_entry 
   897                              <1> 
   898                              <1> loc_scasb_find_dir_ext:
   899 00009999 3A07                <1> 	cmp	al, [edi]
   900 0000999B 75C0                <1> 	jne	short loc_find_dir_next_entry_ebp
   901                              <1> loc_scasb_find_dir_ext_inc_di:
   902 0000999D 47                  <1> 	inc	edi
   903 0000999E E296                <1> 	loop    loc_lodsb_find_dir_ext
   904 000099A0 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 000099A2 31C9                <1> 	xor	ecx, ecx
   909 000099A4 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 000099A5 B802000000          <1> 	mov	eax, 2 ; File Not Found
   915 000099AA 8A35[6C3D0100]      <1> 	mov	dh, [PreviousAttr]
   916 000099B0 66891D[993C0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   917 000099B7 F9                  <1> 	stc
   918 000099B8 C3                  <1> 	retn
   919                              <1> 
   920                              <1> loc_find_free_deleted_entry_0:
   921 000099B9 66A1[683D0100]      <1> 	mov	ax, [FDE_AttrMask]
   922 000099BF 8A2F                <1> 	mov	ch, [edi]
   923 000099C1 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   924 000099C4 08C9                <1> 	or	cl, cl 
   925 000099C6 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 000099C8 80F9FF              <1> 	cmp	cl, 0FFh
   929 000099CB 7432                <1> 	je	short loc_find_free_deleted_entry_1
   930 000099CD EB4D                <1> 	jmp	short pass_loc_check_ffde_0_err
   931                              <1> 
   932                              <1> loc_check_ffde_0_repeat:
   933 000099CF 08ED                <1> 	or	ch, ch
   934 000099D1 7511                <1> 	jnz	short loc_check_ffde_0_next
   935                              <1> 
   936                              <1> loc_check_ffde_retn_2:
   937 000099D3 6629C0              <1> 	sub	ax, ax
   938 000099D6 8A35[6C3D0100]      <1> 	mov	dh, [PreviousAttr]
   939 000099DC 66891D[993C0100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   940 000099E3 C3                  <1> 	retn
   941                              <1>  
   942                              <1> loc_check_ffde_0_next:
   943 000099E4 6643                <1> 	inc	bx
   944 000099E6 83C720              <1> 	add	edi, 32
   945                              <1> 	;inc	word [DirBuff_EntryCounter]
   946                              <1> 	 
   947 000099E9 663B1D[9B3C0100]    <1>         cmp	bx, [DirBuff_LastEntry]
   948 000099F0 77B0                <1> 	ja	short loc_ffde_stc_retn_255
   949 000099F2 8815[6C3D0100]      <1> 	mov	[PreviousAttr], dl
   950 000099F8 8A2F                <1> 	mov	ch, [edi]
   951 000099FA 8A570B              <1> 	mov	dl, [edi+0Bh] ; file attributes
   952 000099FD EBD0                <1> 	jmp	short loc_check_ffde_0_repeat
   953                              <1> 
   954                              <1> loc_find_free_deleted_entry_1:
   955 000099FF 28D2                <1> 	sub	dl, dl      
   956                              <1> loc_find_free_deleted_entry_2:
   957 00009A01 20ED                <1> 	and	ch, ch  
   958 00009A03 74CE                <1> 	jz	short loc_check_ffde_retn_2
   959 00009A05 80FDE5              <1> 	cmp	ch, 0E5h
   960 00009A08 74C9                <1> 	je	short loc_check_ffde_retn_2
   961 00009A0A 6643                <1> 	inc	bx
   962 00009A0C 83C720              <1> 	add	edi, 32
   963 00009A0F 663B1D[9B3C0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   964 00009A16 778A                <1> 	ja	short loc_ffde_stc_retn_255
   965 00009A18 8A2F                <1> 	mov	ch, [edi]
   966 00009A1A EBE5                <1> 	jmp	short loc_find_free_deleted_entry_2
   967                              <1> 
   968                              <1> pass_loc_check_ffde_0_err:
   969 00009A1C 38CD                <1> 	cmp	ch, cl
   970 00009A1E 741F                <1> 	je	short loc_check_ffde_attrib 
   971                              <1> 
   972 00009A20 6643                <1> 	inc	bx
   973 00009A22 83C720              <1> 	add	edi, 32
   974 00009A25 663B1D[9B3C0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   975 00009A2C 0F8770FFFFFF        <1>         ja      loc_ffde_stc_retn_255
   976 00009A32 8815[6C3D0100]      <1> 	mov	[PreviousAttr], dl
   977 00009A38 8A2F                <1> 	mov	ch, [edi]
   978 00009A3A 8A570B              <1> 	mov	dl, [edi+0Bh]
   979 00009A3D EBDD                <1> 	jmp	short pass_loc_check_ffde_0_err
   980                              <1> 
   981                              <1> loc_check_ffde_attrib:
   982 00009A3F 88C6                <1> 	mov	dh, al
   983 00009A41 20D6                <1> 	and	dh, dl    
   984 00009A43 38F0                <1> 	cmp	al, dh
   985 00009A45 759D                <1> 	jne	short loc_check_ffde_0_next
   986 00009A47 20D4                <1> 	and	ah, dl
   987 00009A49 7599                <1> 	jnz	short loc_check_ffde_0_next
   988 00009A4B 30C9                <1> 	xor	cl, cl 
   989 00009A4D 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 00009A4F 56                  <1> 	push	esi  
  1008 00009A50 57                  <1> 	push	edi
  1009                              <1> 
  1010 00009A51 B90B000000          <1> 	mov	ecx, 11
  1011 00009A56 B020                <1> 	mov	al, 20h
  1012 00009A58 F3AA                <1> 	rep	stosb
  1013                              <1> 
  1014 00009A5A 8B3C24              <1> 	mov	edi, [esp]
  1015                              <1> 
  1016 00009A5D 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 00009A5F B50B                <1> 	mov	ch, 11 ; directory entry's name length
  1026                              <1> loc_check_first_dot:
  1027 00009A61 8A06                <1> 	mov	al, [esi]
  1028 00009A63 3C2E                <1> 	cmp	al, 2Eh
  1029 00009A65 750C                <1> 	jne	short pass_check_first_dot
  1030 00009A67 8807                <1> 	mov	[edi], al
  1031 00009A69 47                  <1> 	inc	edi
  1032 00009A6A 46                  <1> 	inc	esi
  1033 00009A6B FEC9                <1> 	dec	cl
  1034 00009A6D 75F2                <1> 	jnz	short loc_check_first_dot
  1035                              <1> 	;;(ecx <= 12)
  1036                              <1> 	;;loop	loc_check_first_dot 
  1037 00009A6F EB30                <1> 	jmp	short stop_convert_file
  1038                              <1> 
  1039                              <1> loc_get_fchar:
  1040 00009A71 8A06                <1> 	mov	al, [esi]
  1041                              <1> pass_check_first_dot:
  1042 00009A73 3C61                <1> 	cmp	al, 61h ; 'a'
  1043 00009A75 7208                <1> 	jb	short pass_name_capitalize
  1044 00009A77 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  1045 00009A79 7704                <1> 	ja	short pass_name_capitalize
  1046 00009A7B 24DF                <1> 	and	al, 0DFh
  1047 00009A7D 8806                <1> 	mov	[esi], al
  1048                              <1> pass_name_capitalize:
  1049 00009A7F 3C21                <1> 	cmp	al, 21h
  1050 00009A81 721E                <1> 	jb	short stop_convert_file
  1051 00009A83 3C2E                <1> 	cmp	al, 2Eh ; '.'
  1052 00009A85 750C                <1> 	jne	short pass_dot_space
  1053                              <1> add_dot_space: 
  1054 00009A87 80F904              <1> 	cmp	cl, 4
  1055 00009A8A 760E                <1> 	jna	short inc_and_loop
  1056 00009A8C 47                  <1> 	inc	edi
  1057 00009A8D FECD                <1> 	dec	ch ; 06/03/2016
  1058 00009A8F FEC9                <1> 	dec	cl
  1059 00009A91 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 00009A93 8807                <1> 	mov	[edi], al
  1071                              <1> loc_after_double_dot:
  1072                              <1> 	; 06/03/2016
  1073 00009A95 FECD                <1> 	dec	ch ; count down for 11 bytes dir entry limit
  1074 00009A97 740A                <1> 	jz	short stop_convert_file_x
  1075 00009A99 47                  <1> 	inc	edi
  1076                              <1> inc_and_loop:
  1077 00009A9A FEC9                <1> 	dec	cl ; count down for 12 bytes filename limit 
  1078 00009A9C 7403                <1> 	jz	short stop_convert_file	
  1079 00009A9E 46                  <1> 	inc	esi
  1080                              <1> 	;;(ecx <= 12)
  1081                              <1> 	;;loop	loc_get_fchar
  1082 00009A9F EBD0                <1> 	jmp	short loc_get_fchar
  1083                              <1> 
  1084                              <1> stop_convert_file:
  1085                              <1> 	; 06/03/2016
  1086 00009AA1 30ED                <1> 	xor	ch, ch
  1087                              <1> 	; ECX < 256 ; 'find_first_file' -> xor cl, cl
  1088                              <1> stop_convert_file_x:
  1089 00009AA3 5F                  <1> 	pop	edi
  1090 00009AA4 5E                  <1> 	pop	esi
  1091 00009AA5 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 00009AA6 57                  <1> 	push	edi
  1111 00009AA7 56                  <1> 	push	esi
  1112                              <1> 	;push	ebx
  1113                              <1> 	;push	ecx
  1114                              <1> 	;push	edx
  1115 00009AA8 50                  <1> 	push	eax
  1116                              <1>            
  1117 00009AA9 29C9                <1> 	sub	ecx, ecx
  1118                              <1> 	;sub	eax, eax
  1119 00009AAB B11A                <1> 	mov	cl, 26
  1120                              <1> 
  1121 00009AAD 0FB607              <1> 	movzx	eax, byte [edi] ; LDIR_Order
  1122 00009AB0 3C41                <1> 	cmp	al, 41h  ; 40h (last long entry sign) + 1
  1123 00009AB2 722B                <1> 	jb	short pass_pslnsc_last_long_entry
  1124                              <1> 
  1125 00009AB4 88C4                <1> 	mov	ah, al
  1126 00009AB6 80EC40              <1> 	sub	ah, 40h
  1127 00009AB9 8825[6E3D0100]      <1> 	mov	[LFN_EntryLength], ah
  1128                              <1> 	
  1129 00009ABF 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 00009AC1 7753                <1> 	ja	short loc_pslnsc_retn
  1133                              <1> 
  1134 00009AC3 2407                <1> 	and	al, 07h ; 0Fh
  1135 00009AC5 A2[6D3D0100]        <1> 	mov	[LongNameFound], al
  1136                              <1> 
  1137 00009ACA FEC8                <1> 	dec	al
  1138                              <1> 	;mov	cl, 26
  1139 00009ACC F6E1                <1> 	mul	cl
  1140                              <1> 
  1141 00009ACE 89C6                <1> 	mov	esi, eax
  1142 00009AD0 01CE                <1> 	add	esi, ecx
  1143                              <1> 		; to make is an ASCIZZ string
  1144                              <1> 		; with ax+26 bytes length
  1145 00009AD2 81C6[703D0100]      <1> 	add	esi, LongFileName
  1146 00009AD8 66C7060000          <1> 	mov	word [esi], 0   
  1147 00009ADD EB16                <1> 	jmp	short loc_pslsc_move_ldir_name2 
  1148                              <1> 
  1149                              <1> pass_pslnsc_last_long_entry:
  1150 00009ADF 3C04                <1> 	cmp	al, 04h
  1151 00009AE1 7733                <1> 	ja	short loc_pslnsc_retn
  1152 00009AE3 FE0D[6D3D0100]      <1> 	dec	byte [LongNameFound]
  1153 00009AE9 3A05[6D3D0100]      <1> 	cmp	al, [LongNameFound]
  1154 00009AEF 7525                <1> 	jne	short loc_pslnsc_retn
  1155                              <1> 
  1156                              <1> loc_pslsc_move_ldir_name1:
  1157 00009AF1 FEC8                <1> 	dec	al
  1158                              <1> 	;mov	cl, 26
  1159 00009AF3 F6E1                <1> 	mul	cl
  1160                              <1> 
  1161                              <1> loc_pslsc_move_ldir_name2:
  1162 00009AF5 8A4F0D              <1> 	mov	cl, [edi+0Dh] ; long name checksum
  1163 00009AF8 880D[6F3D0100]      <1> 	mov	[LFN_CheckSum], cl 
  1164 00009AFE 89FE                <1> 	mov	esi, edi ; LDIR_Order
  1165 00009B00 BF[703D0100]        <1> 	mov	edi, LongFileName
  1166 00009B05 01C7                <1> 	add	edi, eax
  1167 00009B07 46                  <1> 	inc	esi
  1168 00009B08 B105                <1> 	mov	cl, 5 ; chars 1 to 5
  1169 00009B0A F366A5              <1> 	rep	movsw
  1170 00009B0D 83C603              <1> 	add	esi, 3
  1171 00009B10 A5                  <1> 	movsd	; char 6 & 7 
  1172 00009B11 A5                  <1> 	movsd	; char 8 & 9
  1173 00009B12 A5                  <1> 	movsd	; char 10 & 11
  1174 00009B13 46                  <1> 	inc	esi
  1175 00009B14 46                  <1> 	inc	esi 
  1176 00009B15 A5                  <1> 	movsd   ; char 12 & 13 
  1177                              <1> 
  1178                              <1> loc_pslnsc_retn:
  1179 00009B16 58                  <1>  	pop	eax
  1180                              <1> 	;pop	edx
  1181                              <1> 	;pop	ecx
  1182                              <1> 	;pop	ebx
  1183 00009B17 5E                  <1> 	pop	esi  
  1184 00009B18 5F                  <1> 	pop	edi
  1185                              <1>  
  1186 00009B19 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 00009B1A 57                  <1> 	push	edi
  1207 00009B1B B914000000          <1> 	mov	ecx, 20  ; 80 bytes
  1208 00009B20 31C0                <1> 	xor	eax, eax
  1209 00009B22 F3AB                <1> 	rep	stosd 
  1210 00009B24 5F                  <1> 	pop	edi
  1211                              <1> 
  1212 00009B25 668B06              <1> 	mov	ax, [esi]
  1213 00009B28 80FC3A              <1> 	cmp	ah, ':'
  1214 00009B2B 741C                <1> 	je	short loc_ppn_change_drive
  1215 00009B2D A0[6E340100]        <1> 	mov	al, [Current_Drv]
  1216 00009B32 EB33                <1> 	jmp	short pass_ppn_change_drive
  1217                              <1> 
  1218                              <1> pass_ppn_cdir:
  1219 00009B34 8B35[923E0100]      <1> 	mov	esi, [First_Path_Pos]
  1220 00009B3A AC                  <1> 	lodsb
  1221                              <1> loc_ppn_get_filename:
  1222 00009B3B 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 00009B3E B10C                <1> 	mov	cl, 12
  1226                              <1> loc_ppn_get_fnchar_next:
  1227 00009B40 AA                  <1> 	stosb
  1228 00009B41 AC                  <1> 	lodsb
  1229 00009B42 3C21                <1> 	cmp	al, 21h
  1230 00009B44 7274                <1> 	jb	short loc_ppn_clc_return 
  1231 00009B46 E2F8                <1>         loop    loc_ppn_get_fnchar_next
  1232                              <1> loc_ppn_return:
  1233 00009B48 C3                  <1> 	retn
  1234                              <1> 
  1235                              <1> loc_ppn_change_drive:
  1236 00009B49 24DF                <1> 	and	al, 0DFh
  1237 00009B4B 2C41                <1> 	sub	al, 'A'; A:
  1238 00009B4D 726F                <1> 	jc	short loc_ppn_invalid_drive
  1239 00009B4F 3805[14F00000]      <1> 	cmp	[Last_DOS_DiskNo], al
  1240 00009B55 7267                <1> 	jb	short loc_ppn_invalid_drive
  1241                              <1> 
  1242 00009B57 46                  <1> 	inc	esi
  1243 00009B58 46                  <1> 	inc	esi
  1244 00009B59 8A26                <1> 	mov	ah, [esi]
  1245 00009B5B 80FC21              <1> 	cmp	ah, 21h
  1246 00009B5E 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 00009B60 8807                <1> 	mov	[edi], al ; Drv 
  1251 00009B62 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 00009B66 C3                  <1> 	retn
  1257                              <1> 
  1258                              <1> pass_ppn_change_drive:
  1259 00009B67 8935[923E0100]      <1> 	mov	[First_Path_Pos], esi
  1260 00009B6D C705[963E0100]0000- <1> 	mov	dword [Last_Slash_Pos], 0
  1260 00009B75 0000                <1>
  1261 00009B77 AA                  <1> 	stosb
  1262 00009B78 8A06                <1> 	mov	al, [esi]
  1263                              <1> loc_scan_ppn_dslash:
  1264 00009B7A 3C2F                <1> 	cmp	al, '/'
  1265 00009B7C 7506                <1>   	jne	short loc_scan_next_slash_pos
  1266 00009B7E 8935[963E0100]      <1> 	mov	[Last_Slash_Pos], esi
  1267                              <1> loc_scan_next_slash_pos:
  1268 00009B84 46                  <1> 	inc	esi
  1269 00009B85 8A06                <1> 	mov	al, [esi]
  1270 00009B87 3C20                <1> 	cmp	al, 20h
  1271 00009B89 77EF                <1> 	ja	short loc_scan_ppn_dslash
  1272 00009B8B 833D[963E0100]00    <1> 	cmp	dword [Last_Slash_Pos], 0
  1273 00009B92 76A0                <1> 	jna	short pass_ppn_cdir
  1274                              <1> 	
  1275 00009B94 8B0D[963E0100]      <1> 	mov	ecx, [Last_Slash_Pos]
  1276 00009B9A 8B35[923E0100]      <1> 	mov	esi, [First_Path_Pos]
  1277 00009BA0 29F1                <1> 	sub	ecx, esi
  1278 00009BA2 41                  <1> 	inc	ecx
  1279                              <1> 	;cmp	ecx, 64
  1280 00009BA3 80F940              <1> 	cmp	cl, 64
  1281 00009BA6 7715                <1> 	ja	short loc_ppn_invalid_drive_stc
  1282                              <1> 
  1283 00009BA8 89F8                <1> 	mov	eax, edi ; Dest Dir String Location (65 byte)
  1284 00009BAA F3A4                <1> 	rep	movsb
  1285                              <1> 	;mov	[edi], cl ; 0, End of Dir String
  1286 00009BAC 8B35[963E0100]      <1> 	mov	esi, [Last_Slash_Pos]
  1287 00009BB2 46                  <1> 	inc	esi
  1288 00009BB3 89C7                <1> 	mov	edi, eax
  1289 00009BB5 AC                  <1> 	lodsb
  1290 00009BB6 3C21                <1> 	cmp	al, 21h
  1291 00009BB8 7381                <1> 	jnb	short loc_ppn_get_filename
  1292                              <1> loc_ppn_clc_return:
  1293                              <1> 	;clc
  1294 00009BBA 31C0                <1> 	xor	eax, eax
  1295 00009BBC C3                  <1> 	retn
  1296                              <1> 
  1297                              <1> loc_ppn_invalid_drive_stc:
  1298 00009BBD F5                  <1> 	cmc	 ; stc
  1299                              <1> loc_ppn_invalid_drive:
  1300                              <1> 	; cf = 1
  1301                              <1> 	; The Drive Letter/Char < "A" or > "Z"
  1302 00009BBE 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 00009BC2 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 00009BC3 66B80008            <1> 	mov	ax, 0800h 
  1340                              <1> 		; it must not be volume name or longname
  1341 00009BC7 E837DDFFFF          <1> 	call	find_first_file
  1342 00009BCC 7216                <1> 	jc	short loc_fln_retn
  1343                              <1>  
  1344                              <1> loc_fln_check_FAT_Type:
  1345 00009BCE 803D[6D340100]01    <1> 	cmp	byte [Current_FATType], 1
  1346 00009BD5 7306                <1> 	jnb	short loc_fln_check_longname_yes_sign
  1347                              <1> 
  1348 00009BD7 E839000000          <1> 	call	get_fs_longname
  1349 00009BDC C3                  <1> 	retn
  1350                              <1> 
  1351                              <1> loc_fln_check_longname_yes_sign:
  1352 00009BDD 08FF                <1> 	or	bh, bh
  1353 00009BDF 7504                <1> 	jnz	short loc_fln_check_longnamefound_number
  1354                              <1> loc_fln_longname_not_found_retn:
  1355 00009BE1 31C0                <1> 	xor	eax, eax 
  1356                              <1> 	; cf = 1 & al = 0 -> longname not found
  1357 00009BE3 F9                  <1> 	stc
  1358                              <1> loc_fln_retn:
  1359 00009BE4 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 00009BE5 803D[6D3D0100]01    <1>         cmp     byte [LongNameFound], 1
  1370 00009BEC 75F3                <1> 	jne	short loc_fln_longname_not_found_retn
  1371                              <1>              
  1372                              <1> loc_fln_calculate_checksum: 
  1373 00009BEE 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 00009BF3 3805[6F3D0100]      <1> 	cmp	[LFN_CheckSum], al
  1384 00009BF9 75E6                <1> 	jne	short loc_fln_longname_not_found_retn
  1385                              <1> 
  1386 00009BFB BE[703D0100]        <1> 	mov	esi, LongFileName
  1387 00009C00 A0[6D340100]        <1> 	mov	al, [Current_FATType]
  1388 00009C05 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 00009C06 30C0                <1> 	xor	al, al
  1413 00009C08 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 00009C0D D0C8                <1> 	ror	al, 1 ; 17/10/2009  
  1422 00009C0F 0206                <1> 	add	al, [esi]
  1423 00009C11 46                  <1> 	inc	esi
  1424                              <1> 	;add	al, ah
  1425 00009C12 E2F9                <1> 	loop	loc_next_sum
  1426 00009C14 C3                  <1> 	retn
  1427                              <1> 
  1428                              <1> get_fs_longname:
  1429                              <1> 	; temporary (13/02/2016)
  1430 00009C15 31C0                <1> 	xor eax, eax
  1431 00009C17 F9                  <1> 	stc
  1432 00009C18 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 00009C19 80E107              <1> 	and	cl, 07h
  1455 00009C1C 880D[EC3E0100]      <1> 	mov	byte [mkdir_attrib], cl
  1456                              <1> 
  1457 00009C22 56                  <1> 	push	esi
  1458 00009C23 31DB                <1> 	xor	ebx, ebx
  1459 00009C25 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  1460 00009C2B BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1461 00009C30 01DE                <1> 	add	esi, ebx
  1462 00009C32 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 00009C33 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  1467 00009C37 730B                <1> 	jnb	short loc_mkdir_check_file_sytem
  1468                              <1> 	; 16/10/2016 (13h -> 30)
  1469 00009C39 B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  1470 00009C3E 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 00009C43 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 00009C44 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1482 00009C48 730B                <1> 	jnb	short loc_mkdir_check_free_sectors
  1483                              <1> 
  1484                              <1> loc_make_fs_directory:
  1485 00009C4A A1[68340100]        <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 00009C4F E8D8150000          <1> 	call	make_fs_directory
  1490 00009C54 C3                  <1> 	retn
  1491                              <1> 
  1492                              <1> loc_mkdir_check_free_sectors:
  1493 00009C55 0FB64613            <1>         movzx   eax, byte [esi+LD_BPB+SecPerClust]
  1494 00009C59 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1495 00009C5C 39C1                <1> 	cmp	ecx, eax
  1496 00009C5E 7255                <1> 	jb	short loc_mkdir_insufficient_disk_space
  1497                              <1> 
  1498                              <1> loc_make_fat_directory:
  1499 00009C60 891D[DC3E0100]      <1> 	mov	[mkdir_DirName_Offset], ebx
  1500 00009C66 890D[E83E0100]      <1> 	mov	[mkdir_FreeSectors], ecx
  1501                              <1> 
  1502                              <1> 	;mov	al, [esi+LD_BPB+SecPerClust]
  1503 00009C6C A2[EE3E0100]        <1> 	mov	byte [mkdir_SecPerClust], al
  1504                              <1> 
  1505                              <1> loc_mkdir_gffc_1:
  1506 00009C71 E812180000          <1> 	call	get_first_free_cluster
  1507 00009C76 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 00009C78 A3[E03E0100]        <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 00009C7D 31C0                <1> 	xor	eax, eax
  1524 00009C7F 89C1                <1>         mov	ecx, eax
  1525 00009C81 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 00009C83 E8D2FAFFFF          <1> 	call	locate_current_dir_file
  1530 00009C88 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 00009C8A 83F802              <1> 	cmp	eax, 2  ; cmp al, 2 ; File/Dir not found !
  1534 00009C8D 752B                <1> 	jne	short loc_mkdir_stc_return
  1535                              <1> 
  1536                              <1> loc_mkdir_add_new_cluster:
  1537 00009C8F 3805[6D340100]      <1> 	cmp	byte [Current_FATType], al ; 2
  1538                              <1> 	;cmp	byte ptr [esi+LD_FATType], 2
  1539 00009C95 770C                <1> 	ja	short loc_mkdir_add_new_cluster_check_fsc
  1540 00009C97 803D[6C340100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  1541                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  1542 00009C9E 7303                <1> 	jnb	short loc_mkdir_add_new_cluster_check_fsc
  1543                              <1> 
  1544 00009CA0 B00C                <1> 	mov	al, 12 ; No more files 
  1545                              <1> loc_mkdir_gffc_retn:
  1546 00009CA2 C3                  <1> 	retn
  1547                              <1> 
  1548                              <1> loc_mkdir_add_new_cluster_check_fsc:
  1549 00009CA3 8B0D[E83E0100]      <1> 	mov	ecx, [mkdir_FreeSectors]
  1550                              <1> 	;movzx	eax, byte [mkdir_SecPerClust]
  1551 00009CA9 A0[EE3E0100]        <1> 	mov	al, [mkdir_SecPerClust]
  1552 00009CAE 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  1553 00009CB1 39C1                <1> 	cmp	ecx, eax
  1554 00009CB3 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 00009CB5 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 00009CB9 C3                  <1> 	retn
  1565                              <1> 
  1566                              <1> loc_mkdir_stc_return:
  1567 00009CBA F9                  <1> 	stc
  1568 00009CBB C3                  <1> 	retn 
  1569                              <1> 
  1570                              <1> loc_mkdir_gffc_2:
  1571 00009CBC E8C7170000          <1> 	call	get_first_free_cluster
  1572 00009CC1 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 00009CC3 A3[E03E0100]        <1> 	mov	[mkdir_FFCluster], eax
  1580                              <1> 
  1581 00009CC8 A1[E43E0100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1582                              <1> 
  1583 00009CCD E845170000          <1> 	call	load_FAT_sub_directory 
  1584 00009CD2 72CE                <1> 	jc	short loc_mkdir_gffc_retn
  1585                              <1> 
  1586 00009CD4 31FF                <1> 	xor	edi, edi
  1587                              <1> loc_mkdir_set_ff_dir_entry_1:
  1588                              <1> 	; 27/02/2016
  1589 00009CD6 56                  <1> 	push	esi ; Logical DOS Drv Desc. Tbl. address
  1590                              <1> 	; EDI = Directory Entry Address
  1591 00009CD7 8B35[DC3E0100]      <1> 	mov	esi, [mkdir_DirName_Offset]
  1592 00009CDD A1[E03E0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1593                              <1> 
  1594 00009CE2 66B91000            <1> 	mov	cx, 10h	; CL = Directory attribute
  1595                              <1> 			; CH = 0 -> File size is 0
  1596 00009CE6 0A0D[EC3E0100]      <1> 	or	cl, [mkdir_attrib] ; S, H, R  
  1597 00009CEC E8B0010000          <1> 	call	make_directory_entry
  1598                              <1> 
  1599 00009CF1 5E                  <1> 	pop	esi
  1600                              <1> 
  1601 00009CF2 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1602 00009CF9 E880020000          <1> 	call	save_directory_buffer
  1603 00009CFE 0F83DA000000        <1>         jnc     loc_mkdir_set_ff_dir_entry_2
  1604                              <1> 
  1605                              <1> loc_mkdir_return:
  1606 00009D04 C3                  <1> 	retn
  1607                              <1> 
  1608                              <1> loc_mkdir_add_new_subdir_cluster:
  1609 00009D05 8B15[9D3C0100]      <1> 	mov	edx, [DirBuff_Cluster]
  1610 00009D0B 8915[E43E0100]      <1> 	mov	[mkdir_LastDirCluster], edx       
  1611                              <1> 
  1612 00009D11 A1[E03E0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1613 00009D16 E8FC160000          <1> 	call	load_FAT_sub_directory 
  1614 00009D1B 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 00009D1D 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 00009D1F 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1625 00009D23 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1626 00009D27 66F7E1              <1> 	mul	cx ; max = 128*(512/4) -> 16384 (stosd)
  1627 00009D2A 6689C1              <1> 	mov	cx, ax
  1628 00009D2D 6629C0              <1> 	sub	ax, ax ; 0
  1629 00009D30 F3AB                <1> 	rep	stosd ; clear directory buffer
  1630                              <1> 
  1631 00009D32 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1632 00009D39 E840020000          <1> 	call	save_directory_buffer 
  1633 00009D3E 72C4                <1> 	jc	short loc_mkdir_return
  1634                              <1> 
  1635                              <1> loc_mkdir_save_added_cluster:
  1636 00009D40 A1[E43E0100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1637 00009D45 8B0D[E03E0100]      <1> 	mov	ecx, [mkdir_FFCluster]
  1638                              <1> 	; 01/03/2016
  1639 00009D4B 31D2                <1> 	xor	edx, edx
  1640 00009D4D 8915[8E3C0100]      <1> 	mov	[FAT_ClusterCounter], edx ; 0 ; reset
  1641 00009D53 E803180000          <1> 	call	update_cluster
  1642 00009D58 7304                <1> 	jnc	short loc_mkdir_save_fat_buffer_0
  1643 00009D5A 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1644 00009D5C 7518                <1> 	jnz	short loc_mkdir_save_fat_buffer_stc_retn
  1645                              <1> 
  1646                              <1> loc_mkdir_save_fat_buffer_0:
  1647 00009D5E A1[E03E0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1648 00009D63 A3[E43E0100]        <1> 	mov	[mkdir_LastDirCluster], eax
  1649                              <1> 
  1650 00009D68 31C9                <1> 	xor	ecx, ecx
  1651 00009D6A 49                  <1> 	dec	ecx ; FFFFFFFFh
  1652                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1653 00009D6B E8EB170000          <1> 	call	update_cluster
  1654 00009D70 731A                <1> 	jnc	short loc_mkdir_save_fat_buffer_1
  1655 00009D72 09C0                <1> 	or	eax, eax
  1656 00009D74 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 00009D76 803D[8E3C0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1661 00009D7D 720C                <1> 	jb	short loc_mkdir_save_fat_buffer_retn
  1662                              <1> 
  1663 00009D7F 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1664                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1665 00009D83 50                  <1> 	push	eax
  1666 00009D84 E8241B0000          <1> 	call	calculate_fat_freespace
  1667 00009D89 58                  <1> 	pop	eax
  1668 00009D8A F9                  <1> 	stc
  1669                              <1> loc_mkdir_save_fat_buffer_retn:
  1670 00009D8B C3                  <1> 	retn
  1671                              <1> 
  1672                              <1> loc_mkdir_save_fat_buffer_1:
  1673                              <1> 	; byte [FAT_BuffValidData] = 2 
  1674 00009D8C E8871A0000          <1> 	call	save_fat_buffer
  1675 00009D91 72E3                <1> 	jc	short loc_mkdir_save_fat_buffer_stc_retn
  1676                              <1> 
  1677                              <1> 	; 01/03/2016
  1678 00009D93 803D[8E3C0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1679 00009D9A 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_2
  1680                              <1> 
  1681                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1682 00009D9C A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1683 00009DA1 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1684 00009DA5 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 00009DAA 09C9                <1> 	or	ecx, ecx 
  1691 00009DAC 7409                <1> 	jz	short loc_mkdir_save_fat_buffer_2
  1692                              <1> 
  1693 00009DAE 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  1694 00009DB2 E8F61A0000          <1> 	call	calculate_fat_freespace
  1695                              <1> 
  1696                              <1> loc_mkdir_save_fat_buffer_2:
  1697 00009DB7 C605[EF3E0100]01    <1> 	mov	byte [mkdir_add_new_cluster], 1
  1698 00009DBE E9C4000000          <1> 	jmp	loc_mkdir_upd_parent_dir_lmdt
  1699                              <1> 
  1700                              <1> loc_mkdir_update_sub_dir_cluster:
  1701 00009DC3 A1[E03E0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1702 00009DC8 29C9                <1> 	sub	ecx, ecx ; 0
  1703                              <1> 	; 01/03/2016
  1704 00009DCA 890D[8E3C0100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; Reset
  1705 00009DD0 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1706                              <1> 
  1707                              <1> 	; ESI = Logical DOS Drive Descisption Table address  
  1708 00009DD1 E885170000          <1> 	call	update_cluster
  1709 00009DD6 7379                <1> 	jnc	short loc_mkdir_save_fat_buffer_3
  1710 00009DD8 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1711 00009DDA 7475                <1> 	jz	short loc_mkdir_save_fat_buffer_3
  1712                              <1> 	; 01/03/2016
  1713 00009DDC 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 00009DDE A1[E03E0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1718                              <1> 	; Load disk sectors as a directory cluster
  1719 00009DE3 E82F160000          <1> 	call	load_FAT_sub_directory 
  1720 00009DE8 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 00009DEA BF40000800          <1> 	mov	edi, Directory_Buffer + 64 ; 26/02/2016
  1726                              <1> 
  1727                              <1> 	; 02/03/2016
  1728 00009DEF 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1729 00009DF3 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1730 00009DF7 F7E1                <1> 	mul 	ecx
  1731 00009DF9 89C1                <1> 	mov	ecx, eax
  1732 00009DFB 6629C0              <1> 	sub	ax, ax
  1733 00009DFE 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 00009E00 BF00000800          <1> 	mov	edi, Directory_Buffer ; 26/02/2016
  1744                              <1> 	
  1745 00009E05 56                  <1> 	push	esi
  1746                              <1> 
  1747 00009E06 BE[F03E0100]        <1> 	mov	esi, mkdir_Name
  1748 00009E0B 66C7062E00          <1> 	mov	word [esi], 2Eh ; db '.', '0'
  1749                              <1> 
  1750 00009E10 A1[E03E0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1751 00009E15 66B91000            <1> 	mov	cx, 10h ; CL = Directory attribute
  1752                              <1> 			; CH = 0 -> File size is 0
  1753 00009E19 E883000000          <1> 	call	make_directory_entry
  1754                              <1> 
  1755 00009E1E 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 00009E23 29C0                <1> 	sub	eax, eax
  1771 00009E25 3805[6C340100]      <1> 	cmp	byte [Current_Dir_Level], al ; 0
  1772 00009E2B 7605                <1> 	jna	short loc_mkdir_set_ff_dir_entry_3
  1773 00009E2D A1[68340100]        <1> 	mov	eax, [Current_Dir_FCluster] ; parent dir
  1774                              <1> loc_mkdir_set_ff_dir_entry_3:
  1775 00009E32 66C746012E00        <1> 	mov	word [esi+1], 2Eh ; db '.', '0'
  1776                              <1> 
  1777                              <1> 	;mov	cx, 10h
  1778 00009E38 E864000000          <1> 	call	make_directory_entry
  1779                              <1> 
  1780 00009E3D 5E                  <1> 	pop	esi
  1781                              <1> 
  1782 00009E3E C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1783 00009E45 E834010000          <1> 	call	save_directory_buffer
  1784 00009E4A 0F8373FFFFFF        <1>         jnc     loc_mkdir_update_sub_dir_cluster
  1785                              <1>  
  1786                              <1> retn_make_fat_directory:
  1787 00009E50 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 00009E51 E8C2190000          <1> 	call	save_fat_buffer
  1793 00009E56 0F821AFFFFFF        <1>         jc      loc_mkdir_save_fat_buffer_stc_retn
  1794                              <1> 
  1795 00009E5C 803D[8E3C0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1796 00009E63 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_4
  1797                              <1> 
  1798                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1799 00009E65 A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1800 00009E6A 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1801 00009E6E 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 00009E73 09C9                <1> 	or	ecx, ecx 
  1808 00009E75 7409                <1>         jz      short loc_mkdir_save_fat_buffer_4
  1809                              <1> 
  1810 00009E77 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space
  1811 00009E7B E82D1A0000          <1> 	call	calculate_fat_freespace
  1812                              <1> 
  1813                              <1> loc_mkdir_save_fat_buffer_4:	
  1814 00009E80 C605[EF3E0100]00    <1> 	mov	byte [mkdir_add_new_cluster], 0
  1815                              <1> 
  1816                              <1> loc_mkdir_upd_parent_dir_lmdt:
  1817 00009E87 E88D010000          <1> 	call	update_parent_dir_lmdt
  1818                              <1> 
  1819                              <1> 	; 01/03/2016
  1820 00009E8C 803D[EF3E0100]00    <1> 	cmp	byte [mkdir_add_new_cluster], 0
  1821 00009E93 0F8723FEFFFF        <1>         ja      loc_mkdir_gffc_2
  1822                              <1> 
  1823                              <1> loc_mkdir_retn_new_dir_cluster:
  1824 00009E99 A1[E03E0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1825 00009E9E 31D2                <1> 	xor	edx, edx
  1826                              <1> loc_mkdir_retn:
  1827 00009EA0 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 00009EA1 51                  <1> 	push	ecx
  1852                              <1> 
  1853 00009EA2 884F0B              <1> 	mov	[edi+11], cl ; Attributes
  1854 00009EA5 6689471A            <1> 	mov	[edi+26], ax ; FClusterLw, 26
  1855 00009EA9 C1E810              <1> 	shr	eax, 16
  1856 00009EAC 66894714            <1> 	mov	[edi+20], ax ; FClusterHw, 20
  1857 00009EB0 6631C0              <1> 	xor	ax, ax 
  1858 00009EB3 6689470C            <1> 	mov	[edi+12], ax ; NTReserved, 12
  1859                              <1> 			     ; CrtTimeTenth, 13
  1860 00009EB7 08ED                <1> 	or	ch, ch
  1861 00009EB9 7402                <1> 	jz	short loc_make_direntry_set_filesize
  1862                              <1> 
  1863 00009EBB 8B03                <1> 	mov	eax, [ebx]
  1864                              <1>         
  1865                              <1> loc_make_direntry_set_filesize:
  1866 00009EBD 89471C              <1> 	mov	[edi+28], eax ; FileSize, 28
  1867                              <1> 	
  1868 00009EC0 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 00009EC5 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 00009ECA 6689470E            <1> 	mov	[edi+14], ax ; CrtTime, 14
  1876 00009ECE 66895710            <1> 	mov	[edi+16], dx ; CrtDate, 16
  1877 00009ED2 66895712            <1> 	mov	[edi+18], dx ; LastAccDate, 18
  1878 00009ED6 66894716            <1> 	mov	[edi+22], ax ; WrtTime, 14
  1879 00009EDA 66895718            <1> 	mov	[edi+24], dx ; WrtDate, 16
  1880 00009EDE 59                  <1> 	pop	ecx
  1881                              <1> 
  1882 00009EDF 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 00009EE0 B404                <1> 	mov	ah, 04h ; Return Current Date
  1893 00009EE2 E8C7B9FFFF          <1> 	call	int1Ah 
  1894                              <1> 
  1895 00009EE7 88E8                <1> 	mov	al, ch ; <- century BCD
  1896 00009EE9 240F                <1> 	and	al, 0Fh
  1897 00009EEB 88EC                <1> 	mov	ah, ch
  1898 00009EED C0EC04              <1> 	shr	ah, 4
  1899 00009EF0 D50A                <1> 	aad
  1900 00009EF2 88C5                <1> 	mov	ch, al ; -> century 
  1901                              <1> 
  1902 00009EF4 88C8                <1> 	mov	al, cl ; <- year BCD
  1903 00009EF6 240F                <1> 	and	al, 0Fh
  1904 00009EF8 88CC                <1> 	mov	ah, cl
  1905 00009EFA C0EC04              <1> 	shr	ah, 4
  1906 00009EFD D50A                <1> 	aad
  1907 00009EFF 88C1                <1> 	mov	cl, al ; -> year
  1908                              <1> 
  1909 00009F01 88E8                <1> 	mov	al, ch
  1910 00009F03 B464                <1> 	mov	ah, 100
  1911 00009F05 F6E4                <1> 	mul	ah
  1912 00009F07 30ED                <1> 	xor	ch, ch
  1913 00009F09 6601C8              <1> 	add	ax, cx
  1914 00009F0C 662DBC07            <1> 	sub	ax, 1980 ; ms-dos epoch
  1915 00009F10 6689C1              <1> 	mov	cx, ax
  1916                              <1> 
  1917 00009F13 88F0                <1> 	mov	al, dh ; <- month in bcd
  1918 00009F15 240F                <1> 	and	al, 0Fh
  1919 00009F17 88F4                <1> 	mov	ah, dh
  1920 00009F19 C0EC04              <1> 	shr	ah, 4
  1921 00009F1C D50A                <1> 	aad
  1922 00009F1E 88C6                <1> 	mov	dh, al ; -> month
  1923                              <1> 
  1924 00009F20 88D0                <1> 	mov	al, dl ; <- day BCD
  1925 00009F22 240F                <1> 	and	al, 0Fh
  1926 00009F24 88D4                <1> 	mov	ah, dl
  1927 00009F26 C0EC04              <1> 	shr	ah, 4
  1928 00009F29 D50A                <1> 	aad
  1929 00009F2B 88C2                <1> 	mov	dl, al ; -> day
  1930                              <1> 
  1931 00009F2D 88C8                <1> 	mov	al, cl ; count of years from 1980
  1932 00009F2F 66C1E004            <1> 	shl	ax, 4
  1933 00009F33 08F0                <1> 	or	al, dh ; month of year, 1 to 12
  1934 00009F35 66C1E005            <1> 	shl	ax, 5
  1935 00009F39 08D0                <1> 	or	al, dl ; day of year, 1 to 31
  1936                              <1> 	
  1937 00009F3B 6650                <1> 	push	ax ; push date
  1938                              <1> 
  1939 00009F3D B402                <1> 	mov	ah, 02h ; Return Current Time
  1940 00009F3F E86AB9FFFF          <1> 	call	int1Ah
  1941                              <1> 
  1942 00009F44 88E8                <1> 	mov	al, ch ; <- hours BCD
  1943 00009F46 240F                <1> 	and	al, 0Fh
  1944 00009F48 88EC                <1> 	mov	ah, ch
  1945 00009F4A C0EC04              <1> 	shr	ah, 4
  1946 00009F4D D50A                <1> 	aad
  1947 00009F4F 88C5                <1> 	mov	ch, al ; -> hours
  1948                              <1> 
  1949 00009F51 88C8                <1> 	mov	al, cl ; <- minutes BCD
  1950 00009F53 240F                <1> 	and	al, 0Fh
  1951 00009F55 88CC                <1> 	mov	ah, cl
  1952 00009F57 C0EC04              <1> 	shr	ah, 4
  1953 00009F5A D50A                <1> 	aad
  1954 00009F5C 88C1                <1> 	mov	cl, al ; -> minutes
  1955                              <1> 
  1956 00009F5E 88F0                <1> 	mov	al, dh ; <- seconds BCD
  1957 00009F60 240F                <1> 	and	al, 0Fh
  1958 00009F62 88F4                <1> 	mov	ah, dh
  1959 00009F64 C0EC04              <1> 	shr	ah, 4
  1960 00009F67 D50A                <1> 	aad
  1961 00009F69 88C6                <1> 	mov	dh, al ; -> seconds
  1962                              <1> 
  1963 00009F6B 88E8                <1> 	mov	al, ch ; hours
  1964 00009F6D 66C1E006            <1> 	shl	ax, 6
  1965 00009F71 08C8                <1> 	or	al, cl ; minutes
  1966 00009F73 66C1E005            <1> 	shl	ax, 5
  1967 00009F77 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 00009F79 08F0                <1> 	or	al, dh ; seconds
  1971                              <1> 
  1972 00009F7B 665A                <1> 	pop	dx ; pop date
  1973                              <1> 	
  1974 00009F7D 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 00009F7E BB00000800          <1> 	mov	ebx, Directory_Buffer
  1994 00009F83 803D[983C0100]02    <1> 	cmp	byte [DirBuff_ValidData], 2
  1995 00009F8A 7403                <1> 	je	short loc_save_dir_buffer
  1996 00009F8C 31C0                <1> 	xor	eax, eax
  1997 00009F8E C3                  <1> 	retn            
  1998                              <1> 
  1999                              <1> loc_save_dir_buffer:
  2000 00009F8F 56                  <1> 	push	esi
  2001 00009F90 31DB                <1> 	xor	ebx, ebx 
  2002 00009F92 8A3D[963C0100]      <1>         mov     bh, [DirBuff_DRV]
  2003 00009F98 80EF41              <1> 	sub	bh, 'A'
  2004 00009F9B BE00010900          <1>         mov     esi, Logical_DOSDisks
  2005 00009FA0 01DE                <1> 	add	esi, ebx
  2006 00009FA2 668B4E03            <1>         mov     cx, [esi+LD_FATType]
  2007                              <1> 	; CH = FS Type (A1h for FS)
  2008                              <1> 	; CL = FAT Type (0 for FS)
  2009 00009FA6 08C9                <1> 	or	cl, cl
  2010 00009FA8 7433                <1> 	jz	short loc_save_dir_buff_stc_retn
  2011                              <1> 
  2012                              <1> loc_save_dir_buffer_check_cluster_no:    
  2013 00009FAA A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2014 00009FAF 28FF                <1> 	sub	bh, bh ; ebx = 0
  2015 00009FB1 09C0                <1> 	or	eax, eax
  2016 00009FB3 7540                <1> 	jnz	short loc_save_sub_dir_buffer
  2017 00009FB5 8A25[973C0100]      <1> 	mov	ah, [DirBuff_FATType]
  2018 00009FBB FEC3                <1> 	inc	bl ;  bl = 1
  2019 00009FBD 38DC                <1> 	cmp	ah, bl
  2020 00009FBF 721D                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2021 00009FC1 FEC3                <1> 	inc	bl ; bl = 2
  2022 00009FC3 38E3                <1> 	cmp	bl, ah
  2023 00009FC5 7217                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2024                              <1> 
  2025                              <1> loc_save_root_dir_buffer:
  2026 00009FC7 668B5E17            <1> 	mov	bx, [esi+LD_BPB+RootDirEnts]
  2027 00009FCB 6683C30F            <1> 	add	bx, 15
  2028 00009FCF 66C1EB04            <1> 	shr	bx, 4 ; 16 dir entries per sector
  2029 00009FD3 6609DB              <1> 	or	bx, bx
  2030 00009FD6 7405                <1> 	jz	short loc_save_dir_buff_stc_retn
  2031                              <1> 	;mov	ecx, ebx 
  2032 00009FD8 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin] ; 26/02/2016
  2033 00009FDB EB23                <1> 	jmp	short loc_write_directory_to_disk
  2034                              <1> 
  2035                              <1> loc_save_dir_buff_stc_retn:
  2036 00009FDD F9                  <1> 	stc
  2037                              <1> loc_save_dir_buff_inv_data_retn:
  2038                              <1> 	; 15/10/2016 (0Dh -> 29)
  2039 00009FDE B01D                <1> 	mov	al, 29 ; Invalid data !
  2040 00009FE0 C605[983C0100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2041 00009FE7 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 00009FE9 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error 
  2046                              <1> 
  2047                              <1> loc_save_dir_buff_retn:
  2048 00009FEE BB00000800          <1> 	mov	ebx, Directory_Buffer
  2049 00009FF3 5E                  <1> 	pop	esi
  2050 00009FF4 C3                  <1> 	retn
  2051                              <1>  
  2052                              <1> loc_save_sub_dir_buffer:
  2053                              <1> 	; ebx  = 0
  2054 00009FF5 83E802              <1> 	sub	eax, 2
  2055 00009FF8 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2056 00009FFB F7E3                <1> 	mul	ebx
  2057 00009FFD 034668              <1>         add     eax, [esi+LD_DATABegin]
  2058                              <1>  	;mov	ecx, ebx
  2059                              <1> 
  2060                              <1> loc_write_directory_to_disk:
  2061 0000A000 89D9                <1>  	mov	ecx, ebx
  2062 0000A002 BB00000800          <1> 	mov	ebx, Directory_Buffer
  2063 0000A007 E85E490000          <1> 	call	disk_write
  2064 0000A00C 72DB                <1> 	jc	short loc_write_directory_to_disk_err
  2065                              <1> 
  2066                              <1> loc_save_dir_buff_validate_retn:
  2067 0000A00E C605[983C0100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2068 0000A015 31C0                <1> 	xor	eax, eax
  2069                              <1> 	; 26/02/2016
  2070 0000A017 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 0000A019 29C0                <1> 	sub	eax, eax
  2086 0000A01B 8A25[6C340100]      <1> 	mov	ah, [Current_Dir_Level]
  2087 0000A021 A0[6D340100]        <1> 	mov	al, [Current_FATType]
  2088 0000A026 3C01                <1> 	cmp	al, 1
  2089 0000A028 723A                <1> 	jb	short loc_UPDLMDT_proc_retn
  2090                              <1>     
  2091                              <1> loc_update_parent_dir_lm_date_time:
  2092 0000A02A 08E4                <1> 	or	ah, ah
  2093 0000A02C 7436                <1> 	jz	short loc_UPDLMDT_proc_retn
  2094                              <1> 
  2095 0000A02E 56                  <1> 	push	esi ; *
  2096 0000A02F 8825[103F0100]      <1> 	mov	[UPDLMDT_CDirLevel], ah
  2097 0000A035 8B15[68340100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2098 0000A03B 8915[113F0100]      <1> 	mov	[UPDLMDT_CDirFCluster], edx
  2099                              <1> 
  2100 0000A041 FECC                <1> 	dec	ah
  2101 0000A043 B90C000000          <1> 	mov	ecx, 12
  2102 0000A048 BE[CF3C0100]        <1>         mov     esi, PATH_Array
  2103                              <1> 
  2104 0000A04D 8825[6C340100]      <1> 	mov	[Current_Dir_Level], ah
  2105 0000A053 08E4                <1> 	or	ah, ah
  2106 0000A055 750E                <1> 	jnz	short loc_update_parent_dir_lmdt_load_sub_dir_1
  2107 0000A057 803D[6D340100]02    <1> 	cmp	byte [Current_FATType], 2
  2108 0000A05E 770B                <1> 	ja	short loc_update_parent_dir_lmdt_load_sub_dir_2
  2109 0000A060 28C0                <1> 	sub	al, al ; eax = 0
  2110 0000A062 EB0A                <1> 	jmp	short loc_update_parent_dir_lmdt_load_sub_dir_3
  2111                              <1> 
  2112                              <1> loc_UPDLMDT_proc_retn:
  2113 0000A064 C3                  <1> 	retn
  2114                              <1>          
  2115                              <1> loc_update_parent_dir_lmdt_load_sub_dir_1:
  2116 0000A065 B010                <1> 	mov	al, 16
  2117 0000A067 F6E4                <1> 	mul	ah 
  2118 0000A069 01C6                <1> 	add	esi, eax
  2119                              <1> 
  2120                              <1> loc_update_parent_dir_lmdt_load_sub_dir_2:  
  2121 0000A06B 8B460C              <1> 	mov	eax, [esi+12] ; Parent Dir First Cluster
  2122                              <1> 
  2123                              <1> loc_update_parent_dir_lmdt_load_sub_dir_3:
  2124 0000A06E A3[68340100]        <1> 	mov	[Current_Dir_FCluster], eax
  2125                              <1> 
  2126 0000A073 83C610              <1> 	add	esi, 16
  2127 0000A076 66BF[F63D]          <1> 	mov	di, Dir_File_Name  
  2128 0000A07A F3A4                <1> 	rep	movsb
  2129                              <1> 	
  2130 0000A07C BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2131 0000A081 29DB                <1> 	sub	ebx, ebx
  2132 0000A083 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  2133 0000A089 01DE                <1> 	add	esi, ebx
  2134 0000A08B E88FF7FFFF          <1> 	call	reload_current_directory
  2135 0000A090 7232                <1> 	jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2136                              <1> 
  2137                              <1> loc_update_parent_dir_lmdt_locate_dir: 
  2138 0000A092 BE[F63D0100]        <1> 	mov	esi, Dir_File_Name        
  2139 0000A097 6631C9              <1> 	xor	cx, cx
  2140 0000A09A 66B81008            <1> 	mov	ax, 0810h ; Only directories
  2141 0000A09E E8B7F6FFFF          <1>         call    locate_current_dir_file
  2142                              <1> 	; EDI = DirBuff Directory Entry Address
  2143 0000A0A3 721F                <1> 	jc short loc_update_parent_dir_lmdt_restore_cdirlevel
  2144                              <1> 
  2145 0000A0A5 E836FEFFFF          <1> 	call	convert_current_date_time
  2146 0000A0AA 66895712            <1> 	mov	[edi+18], dx ; Last Access Date
  2147 0000A0AE 66895718            <1> 	mov	[edi+24], dx ; Last Write Date
  2148 0000A0B2 66894716            <1> 	mov	[edi+22], ax ; Last Write Time
  2149                              <1> 
  2150 0000A0B6 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2151 0000A0BD E8BCFEFFFF          <1> 	call	save_directory_buffer
  2152 0000A0C2 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 0000A0C4 8A25[103F0100]      <1> 	mov	ah, [UPDLMDT_CDirLevel]
  2157 0000A0CA 8825[6C340100]      <1> 	mov	[Current_Dir_Level], ah
  2158 0000A0D0 8B15[113F0100]      <1>         mov     edx, [UPDLMDT_CDirFCluster]
  2159 0000A0D6 8915[68340100]      <1> 	mov	[Current_Dir_FCluster], edx
  2160                              <1> 
  2161 0000A0DC 5E                  <1> 	pop	esi ; *
  2162 0000A0DD 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 0000A0DE 66A3[403F0100]      <1> 	mov	[DLN_EntryNumber], ax
  2177 0000A0E4 C605[423F0100]40    <1>         mov     byte [DLN_40h], 40h
  2178                              <1> 
  2179 0000A0EB E858000000          <1> 	call	locate_current_dir_entry
  2180 0000A0F0 7308                <1> 	jnc	short loc_dln_check_attributes
  2181 0000A0F2 C3                  <1> 	retn
  2182                              <1> 
  2183                              <1> loc_dln_longname_not_found:
  2184 0000A0F3 B802000000          <1> 	mov	eax, 2
  2185 0000A0F8 F9                  <1> 	stc
  2186 0000A0F9 C3                  <1> 	retn
  2187                              <1> 
  2188                              <1> loc_dln_check_attributes:
  2189 0000A0FA B00F                <1> 	mov	al, 0Fh  ; long name
  2190 0000A0FC 8A670B              <1> 	mov	ah, [edi+0Bh] ; dir entry attributes
  2191 0000A0FF 38C4                <1> 	cmp	ah, al
  2192 0000A101 75F0                <1> 	jne	short loc_dln_longname_not_found
  2193 0000A103 8A27                <1> 	mov	ah, [edi]
  2194 0000A105 2A25[423F0100]      <1> 	sub	ah, [DLN_40h]
  2195 0000A10B 76E6                <1> 	jna	short loc_dln_longname_not_found         
  2196 0000A10D 80FC14              <1> 	cmp	ah, 14h ; 84-64=20 -> 20*13=260 bytes
  2197 0000A110 77E1                <1> 	ja	short loc_dln_longname_not_found
  2198                              <1>              
  2199 0000A112 C607E5              <1> 	mov	byte [edi], 0E5h  ; deleted sign
  2200 0000A115 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; changed/write sign
  2201 0000A11C C605[423F0100]00    <1> 	mov	byte [DLN_40h], 0 ; 40h -> 0
  2202                              <1> 	  
  2203                              <1> loc_dln_delete_next_ln_entry:
  2204 0000A123 80FC01              <1> 	cmp	ah, 1
  2205 0000A126 7616                <1> 	jna	short loc_dln_longname_retn
  2206                              <1> loc_dln_delete_next_ln_entry_0:
  2207 0000A128 66FF05[403F0100]    <1> 	inc	word [DLN_EntryNumber]
  2208 0000A12F 0FB705[403F0100]    <1> 	movzx	eax, word [DLN_EntryNumber] 
  2209 0000A136 E80D000000          <1> 	call	locate_current_dir_entry
  2210 0000A13B 73BD                <1> 	jnc	short loc_dln_check_attributes
  2211                              <1> 
  2212                              <1> loc_dln_longname_stc_retn:
  2213 0000A13D 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 0000A13E E83BFEFFFF          <1> 	call	save_directory_buffer
  2219 0000A143 72F8                <1> 	jc	short loc_dln_longname_stc_retn
  2220                              <1> 
  2221                              <1> loc_dln_longname_retn_xor_eax:
  2222 0000A145 31C0                <1> 	xor	eax, eax
  2223 0000A147 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 0000A148 56                  <1> 	push	esi
  2250 0000A149 89C1                <1> 	mov	ecx, eax
  2251 0000A14B BA20000000          <1> 	mov	edx, 32
  2252 0000A150 F7E2                <1> 	mul	edx 
  2253 0000A152 A3[4C3F0100]        <1> 	mov	[LCDE_ByteOffset], eax
  2254 0000A157 31DB                <1> 	xor	ebx, ebx
  2255 0000A159 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  2256 0000A15F A0[963C0100]        <1>         mov     al, [DirBuff_DRV]
  2257 0000A164 2C41                <1> 	sub	al, 'A'
  2258 0000A166 BE00010900          <1>         mov     esi, Logical_DOSDisks
  2259 0000A16B 01DE                <1> 	add	esi, ebx
  2260 0000A16D 38C7                <1> 	cmp	bh, al
  2261 0000A16F 0F8592000000        <1>         jne     loc_lcde_reload_current_directory
  2262                              <1> loc_lcde_cdl_check:
  2263 0000A175 803D[6C340100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2264 0000A17C 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 0000A17E 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2269 0000A182 7324                <1> 	jnb	short loc_lcde_calc_dirbuff_cluster_offset
  2270                              <1> 
  2271                              <1> loc_lcde_cdl_check_FAT12_16:
  2272 0000A184 668B4617            <1> 	mov	ax, [esi+LD_BPB+RootDirEnts]
  2273 0000A188 6648                <1> 	dec	ax
  2274                              <1> 	;xor	dx, dx  
  2275 0000A18A 6639C8              <1> 	cmp	ax, cx ; cx = Directory Entry (Index) Number
  2276 0000A18D 720E                <1> 	jb	short loc_lcde_stc_12h_retn
  2277 0000A18F 66890D[443F0100]    <1> 	mov	[LCDE_EntryIndex], cx
  2278 0000A196 31C0                <1> 	xor	eax, eax
  2279 0000A198 E993000000          <1>         jmp     loc_lcde_check_dir_buffer_cluster
  2280                              <1> 
  2281                              <1> loc_lcde_stc_12h_retn:
  2282 0000A19D 5E                  <1> 	pop	esi
  2283 0000A19E 89CB                <1> 	mov	ebx, ecx
  2284 0000A1A0 89D1                <1> 	mov	ecx, edx
  2285                              <1> 	; 16/10/2016 (12h -> 12)
  2286 0000A1A2 B80C000000          <1> 	mov	eax, 12 ; No more files
  2287 0000A1A7 C3                  <1> 	retn 
  2288                              <1> 
  2289                              <1> loc_lcde_calc_dirbuff_cluster_offset:
  2290 0000A1A8 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2291 0000A1AB 30FF                <1> 	xor	bh, bh
  2292 0000A1AD 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  2293 0000A1B1 66F7E3              <1> 	mul	bx
  2294 0000A1B4 6609D2              <1>  	or	dx, dx ; If bytes per cluster > 32KB it is invalid
  2295 0000A1B7 755D                <1> 	jnz	short loc_lcde_invalid_format
  2296                              <1> 	;mov	ecx, eax
  2297 0000A1B9 6689C1              <1> 	mov	cx, ax ; BYTES PER CLUSTER
  2298 0000A1BC A1[4C3F0100]        <1> 	mov	eax, [LCDE_ByteOffset]
  2299                              <1> 	;sub	edx, edx
  2300 0000A1C1 F7F1                <1> 	div	ecx
  2301 0000A1C3 3DFFFF0000          <1> 	cmp	eax, 65535
  2302 0000A1C8 774C                <1> 	ja	short loc_lcde_invalid_format
  2303                              <1> 
  2304                              <1> 	; cluster sequence number of directory (< 65536)
  2305 0000A1CA 66A3[463F0100]      <1> 	mov	[LCDE_ClusterSN], ax 
  2306                              <1> 
  2307 0000A1D0 6689D0              <1> 	mov	ax, dx ; byte offset in cluster (directory buffer)
  2308 0000A1D3 66BB2000            <1> 	mov	bx, 32 ; ; 1 dir entry = 32 bytes
  2309 0000A1D7 6629D2              <1>         sub     dx, dx  ; 0
  2310 0000A1DA 66F7F3              <1> 	div	bx 
  2311 0000A1DD 66A3[443F0100]      <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 0000A1E3 A1[68340100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2315                              <1> 
  2316                              <1> loc_lcde_get_next_cluster:
  2317 0000A1E8 66833D[463F0100]00  <1> 	cmp	word [LCDE_ClusterSN], 0
  2318 0000A1F0 763E                <1> 	jna	short loc_lcde_check_dir_buffer_cluster
  2319 0000A1F2 A3[483F0100]        <1> 	mov	[LCDE_Cluster], eax
  2320 0000A1F7 E835100000          <1> 	call	get_next_cluster
  2321 0000A1FC 7220                <1> 	jc	short loc_lcde_check_gnc_error
  2322 0000A1FE 66FF0D[463F0100]    <1>   	dec	word [LCDE_ClusterSN]
  2323 0000A205 EBE1                <1> 	jmp	short loc_lcde_get_next_cluster
  2324                              <1> 
  2325                              <1> loc_lcde_reload_current_directory:
  2326 0000A207 51                  <1> 	push	ecx
  2327 0000A208 E812F6FFFF          <1> 	call	reload_current_directory
  2328 0000A20D 59                  <1> 	pop	ecx
  2329 0000A20E 0F8361FFFFFF        <1>         jnc     loc_lcde_cdl_check
  2330 0000A214 5E                  <1> 	pop	esi
  2331 0000A215 C3                  <1> 	retn
  2332                              <1> 
  2333                              <1> loc_lcde_invalid_format:
  2334                              <1> 	; 15/10/2016 (0Bh -> 28)
  2335 0000A216 B81C000000          <1> 	mov	eax, 28 ; Invalid Format !
  2336                              <1> loc_lcde_drive_not_ready_read_err:
  2337 0000A21B F9                  <1> 	stc
  2338 0000A21C 5E                  <1> 	pop	esi 
  2339 0000A21D C3                  <1> 	retn  
  2340                              <1> 
  2341                              <1> loc_lcde_check_gnc_error:
  2342 0000A21E 09C0                <1> 	or	eax, eax
  2343 0000A220 75F9                <1> 	jnz	short loc_lcde_drive_not_ready_read_err
  2344 0000A222 66FF0D[463F0100]    <1> 	dec	word [LCDE_ClusterSN]
  2345 0000A229 75EB                <1> 	jnz	short loc_lcde_invalid_format 
  2346 0000A22B A1[483F0100]        <1> 	mov	eax, [LCDE_Cluster]
  2347                              <1> 
  2348                              <1> loc_lcde_check_dir_buffer_cluster:
  2349 0000A230 3B05[9D3C0100]      <1> 	cmp	eax, [DirBuff_Cluster]
  2350 0000A236 755C                <1> 	jne	short loc_lcde_load_dir_cluster
  2351 0000A238 803D[983C0100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
  2352 0000A23F 7727                <1> 	ja	short lcde_check_dir_buffer_cluster_next
  2353 0000A241 803D[6C340100]00    <1> 	cmp	byte [Current_Dir_Level], 0    
  2354 0000A248 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 0000A24A 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2358 0000A24E 7359                <1> 	jnb	short loc_lcde_load_dir_cluster_0
  2359                              <1> 	;
  2360 0000A250 0FB74E17            <1> 	movzx	ecx, word [esi+LD_BPB+RootDirEnts]
  2361 0000A254 6683C10F            <1> 	add	cx, 15 ; round up (16 entries per sector)
  2362 0000A258 66C1E904            <1> 	shr	cx, 4 ; 1 sector contains 16 dir entries	
  2363                              <1> 
  2364 0000A25C 8B4664              <1>         mov     eax, [esi+LD_ROOTBegin]
  2365 0000A25F EB54                <1> 	jmp	short loc_lcde_load_dir_cluster_1 
  2366                              <1> 
  2367                              <1> loc_lcde_validate_dirBuff:
  2368 0000A261 C605[983C0100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2369                              <1> 
  2370                              <1> lcde_check_dir_buffer_cluster_next:
  2371 0000A268 0FB71D[443F0100]    <1> 	movzx	ebx, word [LCDE_EntryIndex]
  2372 0000A26F 663B1D[9B3C0100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2373 0000A276 779E                <1> 	ja	short loc_lcde_invalid_format 
  2374 0000A278 B820000000          <1> 	mov	eax, 32
  2375 0000A27D F7E3                <1> 	mul	ebx
  2376                              <1> 	;or	edx, edx
  2377                              <1> 	;jnz	short loc_lcde_invalid_format
  2378                              <1> 
  2379 0000A27F BF00000800          <1> 	mov	edi, Directory_Buffer  
  2380 0000A284 01C7                <1> 	add	edi, eax ; add entry offset to buffer address
  2381                              <1> 
  2382                              <1> loc_lcde_dir_buffer_last_check:
  2383 0000A286 A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
  2384 0000A28B 0FB60D[983C0100]    <1> 	movzx	ecx, byte [DirBuff_ValidData]
  2385                              <1> 
  2386                              <1> loc_lcde_retn:
  2387 0000A292 5E                  <1> 	pop	esi
  2388 0000A293 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 0000A294 50                  <1> 	push	eax
  2394 0000A295 E8E4FCFFFF          <1> 	call	save_directory_buffer
  2395 0000A29A 58                  <1> 	pop	eax
  2396 0000A29B 72F5                <1> 	jc	short loc_lcde_retn
  2397                              <1> 
  2398                              <1> loc_lcde_load_dir_cluster_n2:
  2399 0000A29D C605[983C0100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2400 0000A2A4 A3[9D3C0100]        <1> 	mov	[DirBuff_Cluster], eax
  2401                              <1> 
  2402                              <1> loc_lcde_load_dir_cluster_0:
  2403 0000A2A9 83E802              <1> 	sub	eax, 2
  2404 0000A2AC 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  2405 0000A2B0 F7E1                <1> 	mul	ecx
  2406 0000A2B2 034668              <1>         add     eax, [esi+LD_DATABegin]
  2407                              <1> 
  2408                              <1> loc_lcde_load_dir_cluster_1:
  2409 0000A2B5 BB00000800          <1> 	mov	ebx, Directory_Buffer
  2410                              <1> 	; ecx = sector count
  2411 0000A2BA E8BA460000          <1> 	call	disk_read
  2412 0000A2BF 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 0000A2C1 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
  2417 0000A2C6 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 0000A2C8 29C0                <1> 	sub	eax, eax
  2432 0000A2CA 88FC                <1> 	mov	ah, bh
  2433 0000A2CC BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2434 0000A2D1 01C6                <1> 	add	esi, eax
  2435                              <1> 
  2436 0000A2D3 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2437 0000A2D7 7312                <1> 	jnb	short loc_del_fat_file 
  2438                              <1>               
  2439 0000A2D9 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  2440 0000A2DD 7406                <1> 	je	short loc_del_fs_file
  2441                              <1> 
  2442                              <1> loc_del_file_invalid_format:
  2443 0000A2DF 30E4                <1> 	xor	ah, ah
  2444                              <1> 	; 15/10/2016 (0Bh -> 28)
  2445 0000A2E1 B01C                <1> 	mov	al, 28  ; Invalid Format
  2446 0000A2E3 F9                  <1> 	stc 
  2447 0000A2E4 C3                  <1> 	retn
  2448                              <1> 
  2449                              <1> loc_del_fs_file:
  2450 0000A2E5 E8400F0000          <1> 	call	delete_fs_file
  2451 0000A2EA C3                  <1> 	retn
  2452                              <1> 
  2453                              <1> loc_del_fat_file:
  2454 0000A2EB E808000000          <1> 	call	delete_directory_entry
  2455 0000A2F0 7205                <1> 	jc	short loc_del_file_err_retn 
  2456                              <1> 
  2457                              <1> loc_delfile_unlink_cluster_chain:
  2458 0000A2F2 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 0000A2F7 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 0000A2F8 881D[DA3E0100]      <1> 	mov	[DelFile_LNEL], bl
  2485 0000A2FE 66890D[D83E0100]    <1> 	mov	[DelFile_EntryCounter], cx
  2486                              <1> 
  2487 0000A305 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  2488 0000A309 C1E010              <1> 	shl	eax, 16
  2489 0000A30C 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  2490                              <1> 
  2491 0000A310 A3[D43E0100]        <1> 	mov	[DelFile_FCluster], eax
  2492                              <1> 
  2493                              <1> loc_del_short_name:
  2494 0000A315 C607E5              <1> 	mov	byte [edi], 0E5h  ; Deleted sign
  2495                              <1> 
  2496 0000A318 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2497 0000A31F E85AFCFFFF          <1> 	call	save_directory_buffer
  2498 0000A324 723D                <1> 	jc	short loc_delete_direntry_err_return
  2499                              <1>  
  2500                              <1> loc_del_long_name:
  2501 0000A326 0FB615[DA3E0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2502 0000A32D 08D2                <1> 	or	dl, dl
  2503 0000A32F 7416                <1> 	jz	short loc_del_dir_entry_update_parent_dir_lm_date
  2504                              <1> 
  2505 0000A331 8835[DA3E0100]      <1> 	mov	byte [DelFile_LNEL], dh ; 0              
  2506                              <1>   
  2507 0000A337 0FB705[D83E0100]    <1> 	movzx	eax,  word [DelFile_EntryCounter]
  2508 0000A33E 29D0                <1> 	sub	eax, edx
  2509                              <1> 	;jnc	short loc_del_long_name_continue
  2510 0000A340 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 0000A342 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 0000A347 801D[DA3E0100]00    <1> 	sbb	byte [DelFile_LNEL], 0 ; 0FFh if cf = 1
  2523                              <1> 
  2524 0000A34E E8C6FCFFFF          <1> 	call	update_parent_dir_lmdt
  2525 0000A353 B700                <1> 	mov	bh, 0
  2526 0000A355 80D700              <1> 	adc	bh, 0
  2527                              <1> 
  2528 0000A358 8A1D[DA3E0100]      <1> 	mov	bl, byte [DelFile_LNEL]
  2529                              <1>  
  2530                              <1> loc_delete_direntry_return:
  2531 0000A35E A1[D43E0100]        <1> 	mov	eax, [DelFile_FCluster]
  2532                              <1> loc_delete_direntry_err_return:
  2533 0000A363 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 0000A364 803D[6D340100]00    <1> 	cmp	byte [Current_FATType], 0
  2553 0000A36B 7706                <1> 	ja	short loc_rename_directory_entry
  2554                              <1> 
  2555 0000A36D E8B90E0000          <1> 	call	rename_fs_file_or_directory
  2556 0000A372 C3                  <1> 	retn 
  2557                              <1> 	
  2558                              <1> loc_rename_directory_entry:
  2559 0000A373 881D[DA3E0100]      <1> 	mov	[DelFile_LNEL], bl
  2560 0000A379 66890D[D83E0100]    <1> 	mov	[DelFile_EntryCounter], cx
  2561 0000A380 A3[D43E0100]        <1> 	mov	[DelFile_FCluster], eax
  2562                              <1> 
  2563 0000A385 0FB7C1              <1> 	movzx	eax, cx
  2564 0000A388 E8BBFDFFFF          <1> 	call	locate_current_dir_entry
  2565 0000A38D 7308                <1> 	jnc	short loc_rename_direntry_check_fcluster
  2566                              <1> 
  2567                              <1> loc_rename_direntry_pop_retn:
  2568 0000A38F C3                  <1> 	retn
  2569                              <1> 
  2570                              <1> loc_rename_direntry_pop_invd_retn:
  2571 0000A390 F9                  <1> 	stc
  2572                              <1> loc_rename_direntry_invd_retn:
  2573                              <1> 	; 15/10/2016 (0Dh -> 29)
  2574 0000A391 B81D000000          <1> 	mov	eax, 29 ; Invalid data
  2575                              <1> loc_rename_retn:
  2576 0000A396 C3                  <1> 	retn 
  2577                              <1> 
  2578                              <1> loc_rename_direntry_check_fcluster:
  2579 0000A397 668B5714            <1> 	mov	dx, [edi+20] ; First Cluster HW
  2580 0000A39B 66C1E210            <1> 	shl	dx, 16
  2581 0000A39F 668B571A            <1> 	mov	dx, [edi+26] ; First Cluster LW
  2582 0000A3A3 3B15[D43E0100]      <1> 	cmp	edx, [DelFile_FCluster]
  2583 0000A3A9 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 0000A3AB E89FF6FFFF          <1> 	call	convert_file_name
  2594                              <1> 
  2595 0000A3B0 C605[983C0100]02    <1>         mov     byte [DirBuff_ValidData], 2
  2596 0000A3B7 E8C2FBFFFF          <1> 	call	save_directory_buffer
  2597 0000A3BC 72D8                <1> 	jc	short loc_rename_retn
  2598                              <1> 
  2599                              <1> loc_rename_direntry_del_ln:
  2600 0000A3BE 0FB615[DA3E0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2601 0000A3C5 08D2                <1> 	or	dl, dl
  2602 0000A3C7 7410                <1> 	jz	short loc_rename_direntry_update_parent_dir_lm_date
  2603                              <1> 
  2604 0000A3C9 0FB705[D83E0100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  2605 0000A3D0 29D0                <1> 	sub	eax, edx
  2606 0000A3D2 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 0000A3D4 E805FDFFFF          <1> 	call	delete_longname
  2611                              <1> 
  2612                              <1> loc_rename_direntry_update_parent_dir_lm_date:
  2613 0000A3D9 E83BFCFFFF          <1> 	call	update_parent_dir_lmdt
  2614 0000A3DE 31C0                <1> 	xor	eax, eax 
  2615 0000A3E0 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 0000A3E1 3C02                <1> 	cmp	al, 2
  2657 0000A3E3 0F847F010000        <1> 	je	msftdf_df2_check_directory
  2658 0000A3E9 A2[5A400100]        <1> 	mov	[move_cmd_phase], al
  2659                              <1> 
  2660                              <1> msftdf_parse_sf_path:
  2661                              <1> 	; ESI = ASCIIZ pathname (Source)
  2662 0000A3EE 57                  <1> 	push	edi 
  2663 0000A3EF BF[583F0100]        <1> 	mov	edi, SourceFile_Drv
  2664 0000A3F4 E821F7FFFF          <1> 	call	parse_path_name
  2665 0000A3F9 5E                  <1> 	pop	esi
  2666 0000A3FA 7211                <1> 	jc	short msftdf_psf_retn
  2667                              <1> 
  2668                              <1> msftdf_parse_df_path:
  2669                              <1> 	; ESI = ASCIIZ pathname	(Destination)
  2670 0000A3FC BF[D83F0100]        <1> 	mov	edi, DestinationFile_Drv
  2671 0000A401 E814F7FFFF          <1> 	call	parse_path_name
  2672 0000A406 7306                <1> 	jnc	short msftdf_check_sf_drv
  2673                              <1> 
  2674 0000A408 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  2675 0000A40A 7602                <1> 	jna	short msftdf_check_sf_drv
  2676                              <1> 
  2677                              <1> msftdf_stc_retn:
  2678 0000A40C F9                  <1> 	stc
  2679                              <1> msftdf_psf_retn:
  2680 0000A40D C3                  <1> 	retn 
  2681                              <1> 
  2682                              <1> msftdf_check_sf_drv:
  2683 0000A40E A0[583F0100]        <1> 	mov	al, [SourceFile_Drv]
  2684                              <1> 
  2685                              <1> msftdf_check_df_drv:
  2686 0000A413 8A15[D83F0100]      <1> 	mov	dl, [DestinationFile_Drv]
  2687                              <1> 
  2688                              <1> msftdf_compare_sf_df_drv:
  2689 0000A419 29DB                <1> 	sub	ebx, ebx
  2690 0000A41B 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  2691 0000A421 38C2                <1> 	cmp	dl, al
  2692 0000A423 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 0000A425 88C6                <1> 	mov	dh, al ; destination file's drive number
  2697                              <1> 	; 15/10/2016 (11h -> 21)
  2698 0000A427 B815000000          <1> 	mov	eax, 21 ; Not the same drive
  2699 0000A42C F9                  <1> 	stc
  2700 0000A42D C3                  <1> 	retn 
  2701                              <1> 
  2702                              <1> msftdf_check_sf_df_drv_ok:
  2703 0000A42E 8815[5B400100]      <1> 	mov	[msftdf_sf_df_drv], dl
  2704                              <1> 
  2705 0000A434 29C0                <1>         sub	eax, eax
  2706 0000A436 88D4                <1> 	mov	ah, dl
  2707 0000A438 0500010900          <1> 	add	eax, Logical_DOSDisks
  2708 0000A43D A3[5C400100]        <1> 	mov	[msftdf_drv_offset], eax
  2709                              <1> 
  2710 0000A442 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  2711 0000A444 7407                <1> 	je	short msftdf_df_check_directory
  2712                              <1> 
  2713                              <1> msftdf_change_drv:
  2714 0000A446 E826C1FFFF          <1> 	call 	change_current_drive
  2715 0000A44B 726D                <1> 	jc	short msftdf_df_error_retn
  2716                              <1> 	  
  2717                              <1> msftdf_check_destination_file:
  2718                              <1> msftdf_df_check_directory:
  2719 0000A44D BE[D93F0100]        <1> 	mov	esi, DestinationFile_Directory
  2720 0000A452 803E20              <1> 	cmp	byte [esi], 20h
  2721 0000A455 760F                <1> 	jna	short msftdf_df_find_1
  2722                              <1> 
  2723                              <1> msftdf_df_change_directory:
  2724 0000A457 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  2725 0000A45D 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2726 0000A45F E8A2F0FFFF          <1> 	call	change_current_directory
  2727 0000A464 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 0000A466 BE[1A400100]        <1>         mov     esi, DestinationFile_Name
  2734 0000A46B 803E20              <1> 	cmp	byte [esi], 20h
  2735 0000A46E 7631                <1> 	jna	short msftdf_df_copy_sf_name
  2736                              <1> 
  2737                              <1> msftdf_df_find_2:
  2738 0000A470 6631C0              <1> 	xor	ax, ax ; DestinationFile_AttributesMask -> any/zero
  2739 0000A473 E88BD4FFFF          <1> 	call	find_first_file
  2740 0000A478 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 0000A47E 3C02                <1> 	cmp	al, 2
  2745 0000A480 7537                <1> 	jne	short msftdf_df_stc_retn
  2746                              <1>               
  2747                              <1> msftdf_df_check_fname:
  2748                              <1> 	; 15/10/2016
  2749 0000A482 BE[1A400100]        <1> 	mov	esi, DestinationFile_Name ; *
  2750 0000A487 E837D8FFFF          <1> 	call	check_filename
  2751 0000A48C 7307                <1> 	jnc	short msftdf_convert_df_direntry_name
  2752                              <1> 	; invalid file name chars !
  2753 0000A48E B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26
  2754 0000A493 EB24                <1> 	jmp	short msftdf_df_stc_retn
  2755                              <1> 
  2756                              <1> msftdf_convert_df_direntry_name:
  2757                              <1> 	; mov	esi, DestinationFile_Name ; *
  2758 0000A495 BF[2A400100]        <1> 	mov	edi, DestinationFile_DirEntry
  2759 0000A49A E8B0F5FFFF          <1> 	call	convert_file_name
  2760 0000A49F EB1A                <1>   	jmp	short msftdf_restore_current_dir_1
  2761                              <1> 
  2762                              <1> msftdf_df_copy_sf_name:
  2763 0000A4A1 89F7                <1> 	mov	edi, esi
  2764 0000A4A3 57                  <1> 	push	edi 
  2765 0000A4A4 BE[9A3F0100]        <1>         mov     esi, SourceFile_Name
  2766 0000A4A9 B90C000000          <1> 	mov	ecx, 12
  2767                              <1> msftdf_df_copy_sf_name_loop:
  2768 0000A4AE AC                  <1> 	lodsb
  2769 0000A4AF AA                  <1>         stosb
  2770 0000A4B0 08C0                <1> 	or	al, al
  2771 0000A4B2 7402                <1> 	jz	short msftdf_df_copy_sf_name_ok	
  2772 0000A4B4 E2F8                <1>         loop    msftdf_df_copy_sf_name_loop
  2773                              <1> msftdf_df_copy_sf_name_ok:	
  2774 0000A4B6 5E                  <1> 	pop	esi  
  2775 0000A4B7 EBB7                <1> 	jmp	short msftdf_df_find_2
  2776                              <1> 
  2777                              <1> msftdf_df_stc_retn:
  2778 0000A4B9 F9                  <1> 	stc
  2779                              <1> msftdf_restore_cdir_failed:
  2780                              <1> msftdf_df_error_retn:
  2781 0000A4BA C3                  <1> 	retn
  2782                              <1> 
  2783                              <1> msftdf_restore_current_dir_1:
  2784 0000A4BB 803D[15F00000]00    <1> 	cmp	byte [Restore_CDIR], 0
  2785 0000A4C2 760D                <1> 	jna	short msftdf_sf_check_directory
  2786 0000A4C4 8B35[5C400100]      <1> 	mov	esi, [msftdf_drv_offset] 
  2787 0000A4CA E859C1FFFF          <1> 	call	restore_current_directory
  2788 0000A4CF 72E9                <1> 	jc	short msftdf_restore_cdir_failed
  2789                              <1> 
  2790                              <1> msftdf_sf_check_directory:
  2791 0000A4D1 BE[593F0100]        <1> 	mov	esi, SourceFile_Directory
  2792 0000A4D6 803E20              <1> 	cmp	byte [esi], 20h
  2793 0000A4D9 760F                <1> 	jna	short msftdf_sf_find
  2794                              <1> msftdf_sf_change_directory:
  2795 0000A4DB FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  2796 0000A4E1 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2797 0000A4E3 E81EF0FFFF          <1> 	call	change_current_directory
  2798 0000A4E8 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 0000A4EA BE[9A3F0100]        <1>         mov     esi, SourceFile_Name  ; Offset 66
  2805 0000A4EF 66B80018            <1> 	mov	ax, 1800h ; Only files
  2806 0000A4F3 E80BD4FFFF          <1> 	call	find_first_file
  2807 0000A4F8 7217                <1> 	jc	short msftdf_return
  2808                              <1> 
  2809                              <1> msftdf_sf_ambgfn_check:
  2810 0000A4FA 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  2811 0000A4FD 7407                <1> 	jz	short msftdf_sf_found
  2812                              <1> 
  2813                              <1> msftdf_ambiguous_file_name_error:
  2814 0000A4FF B802000000          <1> 	mov	eax, 2 ; File not found error
  2815 0000A504 F9                  <1> 	stc
  2816 0000A505 C3                  <1> 	retn
  2817                              <1> 
  2818                              <1> msftdf_sf_found:
  2819 0000A506 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  2820 0000A509 7416                <1> 	jz	short msftdf_save_sf_structure
  2821                              <1> 
  2822                              <1> msftdf_permission_denied_retn:
  2823 0000A50B B805000000          <1> 	mov	eax, 05h ; Access (Permission) denied !
  2824 0000A510 F9                  <1> 	stc
  2825                              <1> msftdf_rest_cdir_err_retn:
  2826                              <1> msftdf_return:
  2827 0000A511 C3                  <1> 	retn
  2828                              <1> 
  2829                              <1> msftdf_phase_1_return:
  2830 0000A512 31C0                <1> 	xor	eax, eax
  2831 0000A514 A2[5A400100]        <1> 	mov	[move_cmd_phase], al ; 0
  2832 0000A519 FEC0                <1> 	inc	al ; mov al, 1
  2833 0000A51B BB[68A50000]        <1> 	mov	ebx, msftdf_df2_check_directory
  2834                              <1> 	;mov	edx, 0FFFFFFFFh 
  2835 0000A520 C3                  <1> 	retn
  2836                              <1> 
  2837                              <1> msftdf_save_sf_structure:
  2838 0000A521 BE[643E0100]        <1> 	mov	esi, FindFile_DirEntry
  2839 0000A526 BF[AA3F0100]        <1> 	mov	edi, SourceFile_DirEntry
  2840 0000A52B B908000000          <1> 	mov	ecx, 8
  2841 0000A530 F3A5                <1> 	rep	movsd
  2842                              <1> 
  2843                              <1> msftdf_df_copy_sf_parameters:
  2844 0000A532 BE0B000000          <1> 	mov	esi, 11
  2845 0000A537 89F7                <1> 	mov	edi, esi
  2846 0000A539 81C6[AA3F0100]      <1> 	add	esi, SourceFile_DirEntry
  2847 0000A53F 81C7[2A400100]      <1> 	add	edi, DestinationFile_DirEntry
  2848                              <1> 	;mov	ecx, 21
  2849 0000A545 B115                <1> 	mov	cl, 21
  2850 0000A547 F3A4                <1> 	rep	movsb
  2851                              <1> 
  2852                              <1> msftdf_restore_current_dir_2:
  2853 0000A549 803D[15F00000]00    <1> 	cmp	byte [Restore_CDIR], 0
  2854 0000A550 760D                <1> 	jna	short msftdf_df2_check_move_cmd_phase
  2855 0000A552 8B35[5C400100]      <1>  	mov	esi, [msftdf_drv_offset]
  2856 0000A558 E8CBC0FFFF          <1> 	call	restore_current_directory
  2857 0000A55D 72B2                <1> 	jc	short msftdf_rest_cdir_err_retn
  2858                              <1> 
  2859                              <1> msftdf_df2_check_move_cmd_phase:
  2860 0000A55F 803D[5A400100]01    <1> 	cmp	byte [move_cmd_phase], 1
  2861 0000A566 74AA                <1> 	je	short msftdf_phase_1_return
  2862                              <1> 
  2863                              <1> msftdf_df2_check_directory:
  2864 0000A568 BE[D93F0100]        <1> 	mov	esi, DestinationFile_Directory
  2865 0000A56D 803E20              <1> 	cmp	byte [esi], 20h
  2866 0000A570 760F                <1> 	jna	short msftdf_make_dfde_locate_ffe_on_directory
  2867                              <1> msftdf_df2_change_directory:
  2868 0000A572 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  2869 0000A578 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2870 0000A57A E887EFFFFF          <1> 	call	change_current_directory
  2871 0000A57F 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 0000A581 31C0                <1> 	xor	eax, eax
  2883 0000A583 89C1                <1> 	mov	ecx, eax
  2884 0000A585 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 0000A587 E8CEF1FFFF          <1> 	call	locate_current_dir_file
  2889 0000A58C 733F                <1> 	jnc	msftdf_make_dfde_set_ff_dir_entry
  2890                              <1> 	
  2891                              <1> 	;cmp	eax, 2
  2892 0000A58E 3C02                <1>         cmp	al, 2
  2893 0000A590 7537                <1> 	jne	short msftdf_error_retn
  2894                              <1> 
  2895                              <1> msftdf_add_new_dir_entry_check_fs:
  2896 0000A592 8B35[5C400100]      <1> 	mov	esi, [msftdf_drv_offset]
  2897 0000A598 A1[9D3C0100]        <1> 	mov 	eax, [DirBuff_Cluster]
  2898 0000A59D 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2899 0000A5A1 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 0000A5A3 30ED                <1> 	xor	ch, ch ; cx = 0 --> add a new subdir section
  2905 0000A5A5 E8830C0000          <1> 	call	add_new_fs_section
  2906 0000A5AA 721E                <1>         jc	short msftdf_dsfde_error_retn
  2907                              <1> 	;mov	[createfile_LastDirCluster], eax
  2908                              <1> 
  2909 0000A5AC E8A30E0000          <1> 	call	load_FS_sub_directory 
  2910                              <1> 	;mov	ebx, Directory_Buffer 
  2911 0000A5B1 7318                <1> 	jnc	short msftdf_add_new_fs_subdir_section_ok
  2912 0000A5B3 C3                  <1> 	retn	 
  2913                              <1> 
  2914                              <1> msftdf_add_new_subdir_cluster:
  2915 0000A5B4 E881150000          <1> 	call	add_new_cluster
  2916 0000A5B9 720F                <1> 	jc	short msftdf_dsfde_error_retn
  2917                              <1> 	
  2918                              <1> 	;mov	[createfile_LastDirCluster], eax
  2919                              <1> 
  2920 0000A5BB E8570E0000          <1> 	call	load_FAT_sub_directory
  2921 0000A5C0 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 0000A5C2 50                  <1> 	push	eax
  2927 0000A5C3 E851FAFFFF          <1> 	call	update_parent_dir_lmdt
  2928 0000A5C8 58                  <1> 	pop	eax
  2929                              <1> 
  2930                              <1> msftdf_error_retn:
  2931 0000A5C9 F9                  <1> 	stc
  2932                              <1> msftdf_dsfde_restore_cdir_failed:
  2933                              <1> msftdf_dsfde_error_retn:
  2934 0000A5CA C3                  <1> 	retn
  2935                              <1> 
  2936                              <1> msftdf_add_new_fs_subdir_section_ok:
  2937                              <1> msftdf_add_new_subdir_cluster_ok:
  2938 0000A5CB 89DF                <1> 	mov	edi, ebx ; Directory buffer address
  2939                              <1> 
  2940                              <1> msftdf_make_dfde_set_ff_dir_entry:
  2941 0000A5CD 8B15[68340100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2942 0000A5D3 8915[C0400100]      <1> 	mov	[createfile_FFCluster], edx
  2943                              <1> 	; EDI = Directory entry offset
  2944 0000A5D9 BE[2A400100]        <1> 	mov	esi, DestinationFile_DirEntry
  2945 0000A5DE B908000000          <1> 	mov	ecx, 8
  2946 0000A5E3 F3A5                <1> 	rep	movsd
  2947                              <1> 
  2948 0000A5E5 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  2949 0000A5EC E88DF9FFFF          <1> 	call	save_directory_buffer
  2950 0000A5F1 72CF                <1> 	jc	short msftdf_make_dfde_err_upd_pdir_lmdt
  2951                              <1> 
  2952                              <1> msftdf_make_dfde_update_pdir_lmdt:
  2953 0000A5F3 E821FAFFFF          <1> 	call	update_parent_dir_lmdt
  2954                              <1> 
  2955                              <1> msftdf_dsfde_restore_current_dir_1:
  2956 0000A5F8 803D[15F00000]00    <1> 	cmp	byte [Restore_CDIR], 0
  2957 0000A5FF 760D                <1> 	jna	short msftdf_dsfde_check_directory
  2958 0000A601 8B35[5C400100]      <1>  	mov	esi, [msftdf_drv_offset]
  2959 0000A607 E81CC0FFFF          <1> 	call	restore_current_directory
  2960 0000A60C 72BC                <1> 	jc	short msftdf_dsfde_restore_cdir_failed
  2961                              <1> 
  2962                              <1> msftdf_dsfde_check_directory:
  2963 0000A60E BE[593F0100]        <1> 	mov	esi, SourceFile_Directory
  2964 0000A613 803E20              <1> 	cmp	byte [esi], 20h
  2965 0000A616 760F                <1> 	jna	short msftdf_dsfde_find_file
  2966                              <1> 
  2967                              <1> msftdf_dsfde_change_directory:
  2968 0000A618 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  2969 0000A61E 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  2970 0000A620 E8E1EEFFFF          <1> 	call	change_current_directory
  2971 0000A625 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 0000A627 BE[9A3F0100]        <1> 	mov	esi, SourceFile_Name  ; Offset 66
  2978 0000A62C 668B460E            <1> 	mov	ax, [esi+14] ; 80 -> SourceFile_AttributesMask
  2979 0000A630 E8CED2FFFF          <1> 	call	find_first_file
  2980 0000A635 7293                <1> 	jc	short msftdf_dsfde_error_retn
  2981                              <1> 
  2982                              <1> msftdf_dsfde_delete_direntry:
  2983 0000A637 8B35[5C400100]      <1> 	mov	esi, [msftdf_drv_offset]
  2984                              <1> 	
  2985 0000A63D 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2986 0000A641 770A                <1> 	ja	short msftdf_delete_FAT_direntry
  2987                              <1> 	
  2988 0000A643 30DB                <1> 	xor	bl, bl
  2989                              <1> 	; BL = 0 -> File
  2990                              <1> 	; EDI -> Directory buffer entry offset/address 
  2991 0000A645 E8E40B0000          <1> 	call	delete_fs_directory_entry
  2992 0000A64A 7315                <1> 	jnc	short msftdf_dsfde_restore_current_dir_2
  2993 0000A64C C3                  <1> 	retn
  2994                              <1> 
  2995                              <1> msftdf_delete_FAT_direntry:	
  2996 0000A64D 8A1D[613E0100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  2997 0000A653 668B0D[8C3E0100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  2998                              <1> 	; ESI = Logical DOS drive description table address
  2999                              <1> 	; EDI = Directory buffer entry offset/address 
  3000 0000A65A E899FCFFFF          <1> 	call	delete_directory_entry
  3001 0000A65F 721C                <1> 	jc	short msftdf_retn
  3002                              <1> 
  3003                              <1> msftdf_dsfde_restore_current_dir_2:
  3004 0000A661 803D[15F00000]00    <1> 	cmp	byte [Restore_CDIR], 0
  3005 0000A668 7607                <1> 	jna	short msftdf_new_dir_fcluster_retn
  3006                              <1> 	;mov	esi, [msftdf_drv_offset]
  3007 0000A66A E8B9BFFFFF          <1> 	call	restore_current_directory
  3008 0000A66F 720C                <1> 	jc	short msftdf_retn
  3009                              <1> 
  3010                              <1> msftdf_new_dir_fcluster_retn:
  3011 0000A671 31C9                <1> 	xor	ecx, ecx 
  3012 0000A673 A1[C0400100]        <1> 	mov	eax, [createfile_FFCluster]
  3013 0000A678 BB[D83F0100]        <1> 	mov	ebx, DestinationFile_Drv
  3014                              <1> 
  3015                              <1> msftdf_retn:
  3016 0000A67D 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 0000A67E 3C02                <1> 	cmp	al, 2
  3079 0000A680 0F845A020000        <1> 	je	csftdf2_check_cdrv
  3080                              <1> 
  3081                              <1> ; Phase 1
  3082                              <1> 
  3083 0000A686 A2[80400100]        <1> 	mov	byte [copy_cmd_phase], al
  3084                              <1> 
  3085 0000A68B 57                  <1> 	push	edi ; *
  3086                              <1> 
  3087                              <1> csftdf_parse_sf_path:
  3088 0000A68C BF[583F0100]        <1> 	mov	edi, SourceFile_Drv
  3089 0000A691 E884F4FFFF          <1> 	call	parse_path_name
  3090 0000A696 721C                <1> 	jc	short csftdf_parse_sf_path_failed
  3091                              <1> 
  3092                              <1> csftdf_parse_df_path:	
  3093 0000A698 5E                  <1> 	pop	esi ; * (pushed edi) 
  3094                              <1> 
  3095                              <1> csftdf_sf_check_filename_exists:
  3096 0000A699 803D[9A3F0100]21    <1> 	cmp	byte [SourceFile_Name], 21h
  3097 0000A6A0 7215                <1> 	jb	short csftdf_sf_file_not_found_error
  3098                              <1> 
  3099 0000A6A2 BF[D83F0100]        <1> 	mov	edi, DestinationFile_Drv
  3100 0000A6A7 E86EF4FFFF          <1> 	call	parse_path_name
  3101 0000A6AC 7310                <1> 	jnc	short csftdf_check_sf_cdrv
  3102                              <1> 	
  3103 0000A6AE 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  3104 0000A6B0 760C                <1> 	jna	short csftdf_check_sf_cdrv
  3105                              <1> 
  3106                              <1> csftdf_parse_df_path_failed:
  3107 0000A6B2 F9                  <1> 	stc 
  3108                              <1> csftdf_sf_error_retn: 
  3109 0000A6B3 C3                  <1> 	retn
  3110                              <1> 
  3111                              <1> csftdf_parse_sf_path_failed:	
  3112 0000A6B4 5F                  <1> 	pop	edi ; *
  3113 0000A6B5 EBFC                <1> 	jmp	short csftdf_sf_error_retn
  3114                              <1> 
  3115                              <1> csftdf_sf_file_not_found_error:
  3116 0000A6B7 B802000000          <1> 	mov	eax, 2 ; File not found 
  3117 0000A6BC EBF5                <1> 	jmp	short csftdf_sf_error_retn
  3118                              <1> 
  3119                              <1> csftdf_check_sf_cdrv:
  3120 0000A6BE 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  3121                              <1> 
  3122 0000A6C4 883D[83400100]      <1> 	mov	[csftdf_cdrv], bh ; 23/03/2016
  3123                              <1> 
  3124 0000A6CA 8A15[583F0100]      <1> 	mov	dl, [SourceFile_Drv]
  3125 0000A6D0 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  3126 0000A6D2 7407                <1> 	je	short csftdf_sf_check_directory
  3127                              <1> 
  3128 0000A6D4 E898BEFFFF          <1> 	call	change_current_drive
  3129 0000A6D9 72D8                <1> 	jc	short csftdf_sf_error_retn
  3130                              <1> 
  3131                              <1> csftdf_sf_check_directory:
  3132 0000A6DB BE[593F0100]        <1> 	mov	esi, SourceFile_Directory
  3133 0000A6E0 803E20              <1> 	cmp	byte [esi], 20h
  3134 0000A6E3 760F                <1> 	jna	short csftdf_find_sf
  3135                              <1> 
  3136                              <1> csftdf_sf_change_directory:
  3137 0000A6E5 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  3138 0000A6EB 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3139 0000A6ED E814EEFFFF          <1> 	call	change_current_directory
  3140 0000A6F2 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 0000A6F4 BE[9A3F0100]        <1> 	mov	esi, SourceFile_Name
  3147 0000A6F9 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3148 0000A6FD E801D2FFFF          <1> 	call	find_first_file
  3149 0000A702 72AF                <1> 	jc	short csftdf_sf_error_retn
  3150                              <1> 
  3151                              <1> csftdf_sf_ambgfn_check:
  3152 0000A704 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3153 0000A707 7407                <1> 	jz	short csftdf_sf_found
  3154                              <1> 
  3155                              <1> csftdf_ambiguous_file_name_error:
  3156 0000A709 B802000000          <1> 	mov	eax, 2 ; File not found error
  3157 0000A70E F9                  <1> 	stc
  3158 0000A70F C3                  <1> 	retn
  3159                              <1> 
  3160                              <1> csftdf_sf_found:
  3161 0000A710 A3[84400100]        <1> 	mov	[csftdf_filesize], eax
  3162                              <1> 
  3163 0000A715 09C0                <1> 	or	eax, eax
  3164 0000A717 7507                <1> 	jnz	short csftdf_set_source_file_direntry
  3165                              <1> 
  3166                              <1> csftdf_sf_file_size_zero:
  3167 0000A719 B814000000          <1> 	mov	eax, 20 ; TRDOS zero length (file size) error
  3168 0000A71E F9                  <1> 	stc
  3169 0000A71F C3                  <1> 	retn
  3170                              <1> 
  3171                              <1> csftdf_set_source_file_direntry:
  3172 0000A720 BE[643E0100]        <1> 	mov	esi, FindFile_DirEntry
  3173 0000A725 BF[AA3F0100]        <1> 	mov	edi, SourceFile_DirEntry
  3174 0000A72A B908000000          <1> 	mov	ecx, 8
  3175 0000A72F F3A5                <1> 	rep	movsd
  3176                              <1> 
  3177                              <1> csftdf_sf_restore_cdrv:
  3178                              <1> 	; 22/03/2016
  3179 0000A731 8A15[83400100]      <1> 	mov	dl, [csftdf_cdrv]
  3180 0000A737 3A15[6E340100]      <1> 	cmp	dl, [Current_Drv]
  3181 0000A73D 7407                <1> 	je	short csftdf_sf_restore_cdir
  3182 0000A73F E82DBEFFFF          <1> 	call	change_current_drive 
  3183 0000A744 724F                <1> 	jc	short csftdf_df_error_retn ; 30/03/2016
  3184                              <1> 
  3185                              <1> csftdf_sf_restore_cdir:
  3186 0000A746 803D[15F00000]00    <1> 	cmp	byte [Restore_CDIR], 0
  3187 0000A74D 7612                <1> 	jna	short csftdf_df_check_filename_exists
  3188 0000A74F 29C0                <1> 	sub	eax, eax
  3189 0000A751 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3190 0000A756 88D4                <1> 	mov	ah, dl ; byte [csftdf_cdrv]
  3191 0000A758 01C6                <1> 	add	esi, eax
  3192 0000A75A E8C9BEFFFF          <1> 	call	restore_current_directory
  3193 0000A75F 7234                <1> 	jc	short csftdf_df_error_retn
  3194                              <1>   
  3195                              <1> csftdf_df_check_filename_exists:
  3196 0000A761 803D[1A400100]20    <1> 	cmp	byte [DestinationFile_Name], 20h
  3197 0000A768 7716                <1> 	ja	short csftdf_check_df_cdrv
  3198                              <1> 
  3199                              <1> csftdf_copy_sf_name:
  3200 0000A76A BF[1A400100]        <1> 	mov	edi, DestinationFile_Name
  3201 0000A76F BE[9A3F0100]        <1> 	mov	esi, SourceFile_Name
  3202 0000A774 B10C                <1> 	mov	cl, 12
  3203                              <1> 
  3204                              <1> csftdf_df_copy_sf_name_loop:
  3205 0000A776 AC                  <1> 	lodsb
  3206 0000A777 AA                  <1> 	stosb
  3207 0000A778 08C0                <1> 	or	al, al
  3208 0000A77A 7404                <1> 	jz	short csftdf_check_df_cdrv             
  3209 0000A77C FEC9                <1> 	dec	cl
  3210 0000A77E 75F6                <1> 	jnz	csftdf_df_copy_sf_name_loop
  3211                              <1> 
  3212                              <1> csftdf_check_df_cdrv:
  3213 0000A780 8A15[D83F0100]      <1> 	mov	dl, [DestinationFile_Drv]
  3214 0000A786 3A15[6E340100]      <1> 	cmp	dl, [Current_Drv]
  3215 0000A78C 7408                <1> 	je	short csftdf_df_check_directory
  3216                              <1> 
  3217 0000A78E E8DEBDFFFF          <1> 	call	change_current_drive
  3218 0000A793 7301                <1> 	jnc	short csftdf_df_check_directory
  3219                              <1> 
  3220                              <1> csftdf_df_error_retn:
  3221 0000A795 C3                  <1> 	retn
  3222                              <1> 
  3223                              <1> csftdf_df_check_directory:
  3224 0000A796 BE[D93F0100]        <1> 	mov	esi, DestinationFile_Directory
  3225 0000A79B 803E20              <1>         cmp     byte [esi], 20h
  3226 0000A79E 760F                <1> 	jna	short csftdf_find_df
  3227                              <1> 
  3228                              <1> csftdf_df_change_directory:
  3229 0000A7A0 FE05[15F00000]      <1> 	inc	byte [Restore_CDIR]
  3230 0000A7A6 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  3231 0000A7A8 E859EDFFFF          <1> 	call	change_current_directory
  3232 0000A7AD 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 0000A7AF 29DB                <1> 	sub	ebx, ebx
  3240 0000A7B1 8A3D[D83F0100]      <1> 	mov	bh,  [DestinationFile_Drv]
  3241 0000A7B7 81C300010900        <1> 	add	ebx, Logical_DOSDisks
  3242 0000A7BD 891D[B0400100]      <1> 	mov	[csftdf_df_drv_dt], ebx
  3243                              <1> 
  3244 0000A7C3 BE[1A400100]        <1> 	mov	esi, DestinationFile_Name
  3245 0000A7C8 6631C0              <1> 	xor	ax, ax 
  3246                              <1> 		; DestinationFile_AttributesMask -> any/zero
  3247 0000A7CB E833D1FFFF          <1> 	call	find_first_file
  3248 0000A7D0 7218                <1> 	jc	short csftdf_df_check_error_code
  3249                              <1> 
  3250                              <1> csftdf_df_ambgfn_check:
  3251 0000A7D2 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3252 0000A7D5 752A                <1> 	jnz	short csftdf_df_error_inv_fname
  3253                              <1> 	
  3254                              <1> csftdf_df_found:
  3255 0000A7D7 C605[82400100]01    <1> 	mov	byte [DestinationFileFound], 1
  3256                              <1> 	; 17/10/2016 (cl -> bl)
  3257 0000A7DE 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  3258 0000A7E1 745F                <1> 	jz	short csftdf_df_save_first_cluster
  3259                              <1> 
  3260                              <1> csftdf_df_permission_denied_retn:	 
  3261 0000A7E3 B805000000          <1> 	mov	eax, 05h ; Access/Permisson denied.
  3262                              <1> csftdf_df_error_stc_retn:
  3263 0000A7E8 F9                  <1> 	stc
  3264 0000A7E9 C3                  <1> 	retn
  3265                              <1> 
  3266                              <1> csftdf_df_check_error_code:
  3267                              <1> 	;cmp	eax, 2
  3268 0000A7EA 3C02                <1> 	cmp	al, 2
  3269 0000A7EC 75FA                <1> 	jne	short csftdf_df_error_stc_retn
  3270                              <1> 
  3271 0000A7EE C605[82400100]00    <1> 	mov	byte [DestinationFileFound], 0
  3272                              <1> 
  3273                              <1> 	; 15/10/2016
  3274 0000A7F5 BE[543E0100]        <1> 	mov	esi, FindFile_Name ; *
  3275 0000A7FA E8C4D4FFFF          <1> 	call	check_filename
  3276 0000A7FF 7307                <1> 	jnc	short csftdf_df_valid_fname
  3277                              <1> csftdf_df_error_inv_fname: ; 'invalid file name !'
  3278 0000A801 B81A000000          <1> 	mov 	eax, ERR_INV_FILE_NAME  ; 26
  3279 0000A806 F9                  <1> 	stc	
  3280 0000A807 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 0000A808 BF[1A400100]        <1> 	mov	edi, DestinationFile_Name
  3287 0000A80D A5                  <1> 	movsd
  3288 0000A80E A5                  <1> 	movsd	
  3289 0000A80F A5                  <1> 	movsd
  3290                              <1> 	;movsb
  3291                              <1> 
  3292                              <1> csftdf_check_disk_free_size_0:
  3293 0000A810 A1[C63F0100]        <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 0000A815 8B35[B0400100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3302                              <1> 
  3303 0000A81B 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3304 0000A81F 01C8                <1> 	add	eax, ecx
  3305 0000A821 48                  <1> 	dec	eax  ; file size (additional bytes) + 511 (round up)
  3306                              <1> csftdf_check_disk_free_size_3: ; 16/03/2016
  3307 0000A822 29D2                <1> 	sub	edx, edx
  3308 0000A824 F7F1                <1> 	div	ecx ; bytes per sector
  3309                              <1> 
  3310                              <1> csftdf_check_disk_free_size:
  3311 0000A826 3B4674              <1> 	cmp	eax, [esi+LD_FreeSectors]
  3312 0000A829 0F8294000000        <1>         jb      csftdf_check_disk_free_size_ok
  3313 0000A82F 770A                <1> 	ja	short csftdf_df_insufficient_disk_space
  3314                              <1> 
  3315 0000A831 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0 ; FS needs FDT sector also.
  3316 0000A835 0F8788000000        <1>         ja      csftdf_check_disk_free_size_ok 
  3317                              <1> 
  3318                              <1> csftdf_df_insufficient_disk_space:
  3319 0000A83B B827000000          <1> 	mov	eax, 27h ; insufficient disk space
  3320 0000A840 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 0000A842 81EF00000800        <1> 	sub	edi, Directory_Buffer  ; (<65536)
  3328 0000A848 66C1EF05            <1> 	shr	di, 5 ; Convert entry offset to entry index/number
  3329 0000A84C 66893D[52400100]    <1> 	mov	[DestinationFile_DirEntryNumber], di ; (<2048)
  3330                              <1> 
  3331                              <1> csftdf_df_check_sf_df_fcluster:
  3332 0000A853 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  3333 0000A857 C1E210              <1> 	shl	edx, 16
  3334 0000A85A 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  3335 0000A85E 8915[94400100]      <1> 	mov	[csftdf_df_cluster], edx
  3336                              <1> csftdf_df_check_sf_df_fcluster_1:
  3337 0000A864 668B15[BE3F0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3338 0000A86B C1E210              <1> 	shl	edx, 16
  3339 0000A86E 668B15[C43F0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3340 0000A875 3B15[94400100]      <1> 	cmp	edx, [csftdf_df_cluster]
  3341 0000A87B 7512                <1> 	jne	short csftdf_df_check_sf_df_fcluster_ok
  3342                              <1> csftdf_df_check_sf_df_drv:
  3343 0000A87D 8A15[583F0100]      <1> 	mov	dl, [SourceFile_Drv]
  3344 0000A883 3A15[D83F0100]      <1> 	cmp	dl, [DestinationFile_Drv]
  3345 0000A889 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 0000A88B 31C0                <1> 	xor	eax, eax ; mov eax, 0 -> Bad command or file name !
  3351 0000A88D F9                  <1> 	stc
  3352 0000A88E 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 0000A88F BF[2A400100]        <1> 	mov	edi, DestinationFile_DirEntry
  3358 0000A894 B908000000          <1> 	mov	ecx, 8
  3359 0000A899 F3A5                <1> 	rep	movsd
  3360                              <1> 	
  3361                              <1> csftdf_check_disk_free_size_2:
  3362 0000A89B 89C2                <1> 	mov	edx, eax ; Old destination file size
  3363                              <1> 
  3364                              <1> 	;mov	eax, [SourceFile_DirEntry+DirEntry_FileSize]
  3365 0000A89D A1[84400100]        <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 0000A8A2 8B35[B0400100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3375                              <1> 
  3376 0000A8A8 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3377 0000A8AC 01CA                <1> 	add	edx, ecx ; + 512
  3378 0000A8AE 01C8                <1> 	add	eax, ecx ; + 512
  3379 0000A8B0 4A                  <1> 	dec	edx ; old file size + 511 (round up)
  3380 0000A8B1 48                  <1> 	dec	eax ; new file size + 511 (round up)
  3381 0000A8B2 F7D9                <1> 	neg	ecx ; -512 ; 0FFFFFE00h
  3382 0000A8B4 21CA                <1> 	and	edx, ecx ; = old sector count * 512 
  3383 0000A8B6 21C8                <1> 	and	eax, ecx ; = new sector count * 512 
  3384                              <1> 
  3385 0000A8B8 29D0                <1> 	sub	eax, edx ; new file size - old file size (on disk)
  3386 0000A8BA 7607                <1> 	jna	short csftdf_check_disk_free_size_ok
  3387                              <1> 
  3388 0000A8BC 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 0000A8BE 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 0000A8C3 A0[80400100]        <1> 	mov	al, [copy_cmd_phase]
  3398 0000A8C8 3C01                <1> 	cmp	al, 1
  3399 0000A8CA 7514                <1> 	jne	short csftdf2_check_cdrv
  3400                              <1> 	
  3401 0000A8CC 31C0                <1> 	xor	eax, eax
  3402 0000A8CE A2[80400100]        <1> 	mov	[copy_cmd_phase], al ; 0
  3403                              <1> 
  3404 0000A8D3 8A15[82400100]      <1> 	mov	dl, [DestinationFileFound]            
  3405 0000A8D9 8A35[B53F0100]      <1> 	mov	dh, [SourceFile_DirEntry+11] ; Attributes
  3406                              <1>  
  3407                              <1> csftdf_return:	
  3408 0000A8DF 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 0000A8E0 803D[82400100]00    <1> 	cmp	byte [DestinationFileFound], 0 
  3442 0000A8E7 7739                <1> 	ja	short csftdf2_set_sf_percentage
  3443                              <1> 
  3444                              <1> csftdf2_create_file:
  3445 0000A8E9 BE[1A400100]        <1> 	mov	esi, DestinationFile_Name
  3446 0000A8EE A1[84400100]        <1> 	mov	eax, [csftdf_filesize]
  3447 0000A8F3 30C9                <1> 	xor	cl, cl ; 0
  3448                              <1> 
  3449 0000A8F5 31DB                <1> 	xor	ebx, ebx ; 0
  3450 0000A8F7 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 0000A8F8 E8EC050000          <1> 	call	create_file
  3469                              <1> 	;pop	esi
  3470 0000A8FD 0F82A3050000        <1>         jc      csftdf2_rw_error
  3471                              <1> 
  3472                              <1> csftdf2_create_file_OK:
  3473 0000A903 A3[94400100]        <1> 	mov	[csftdf_df_cluster], eax
  3474                              <1> 	
  3475                              <1> 	; 24/03/2016
  3476 0000A908 668915[52400100]    <1> 	mov	[DestinationFile_DirEntryNumber], dx 
  3477                              <1> 
  3478                              <1> 	; 21/03/2016
  3479 0000A90F BE00000800          <1> 	mov	esi, Directory_Buffer
  3480 0000A914 C1E205              <1> 	shl	edx, 5 ; 32 * index number
  3481 0000A917 01D6                <1> 	add	esi, edx
  3482 0000A919 BF[2A400100]        <1> 	mov	edi, DestinationFile_DirEntry	
  3483 0000A91E B108                <1> 	mov	cl, 8 ; 32 bytes
  3484 0000A920 F3A5                <1> 	rep	movsd
  3485                              <1> 
  3486                              <1> csftdf2_set_sf_percentage:
  3487                              <1> 	; 17/03/2016
  3488 0000A922 31C0                <1> 	xor	eax, eax	
  3489 0000A924 A2[A8400100]        <1> 	mov 	[csftdf_percentage], al ; 0, reset
  3490                              <1> 
  3491 0000A929 A3[A0400100]        <1> 	mov	[csftdf_sf_rbytes], eax ; 0, reset
  3492 0000A92E A3[A4400100]        <1> 	mov	[csftdf_df_wbytes], eax ; 0, reset
  3493                              <1> 
  3494 0000A933 8A25[583F0100]      <1> 	mov	ah, [SourceFile_Drv]	
  3495 0000A939 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3496 0000A93E 01C6                <1> 	add	esi, eax
  3497                              <1> 	
  3498 0000A940 8935[AC400100]      <1> 	mov	[csftdf_sf_drv_dt], esi ; 23/03/2016
  3499                              <1> 
  3500 0000A946 668B15[BE3F0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3501 0000A94D C1E210              <1> 	shl	edx, 16
  3502 0000A950 668B15[C43F0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3503 0000A957 8915[90400100]      <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 0000A95D 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  3512 0000A961 880D[D63F0100]      <1> 	mov	[SourceFile_SecPerClust], cl
  3513                              <1> 
  3514                              <1> 	; 17/03/2016
  3515 0000A967 386E03              <1> 	cmp	[esi+LD_FATType], ch ; 0
  3516 0000A96A 7707                <1> 	ja	short csftdf2_set_sf_percent_rsize1
  3517                              <1> 
  3518 0000A96C B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3519 0000A971 EB06                <1> 	jmp	short csftdf2_set_sf_percent_rsize2	
  3520                              <1>  
  3521                              <1> csftdf2_set_sf_percent_rsize1:
  3522 0000A973 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  3523 0000A977 F7E1                <1> 	mul	ecx
  3524                              <1> 	;sub	edx, edx
  3525                              <1> csftdf2_set_sf_percent_rsize2:
  3526 0000A979 A3[98400100]        <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 0000A97E 8B3D[B0400100]      <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 0000A984 8A4F13              <1> 	mov	cl, [edi+LD_BPB+SecPerClust]
  3545 0000A987 880D[56400100]      <1> 	mov	[DestinationFile_SecPerClust], cl
  3546                              <1> 
  3547                              <1> 	; 17/03/2016
  3548 0000A98D 386F03              <1> 	cmp	[edi+LD_FATType], ch ; 0
  3549 0000A990 7707                <1> 	ja	short csftdf2_set_df_percent_wsize1
  3550                              <1> 	
  3551 0000A992 B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3552 0000A997 EB06                <1> 	jmp	short csftdf2_set_df_percent_wsize2	
  3553                              <1> 
  3554                              <1> csftdf2_set_df_percent_wsize1:
  3555 0000A999 0FB74711            <1> 	movzx	eax, word [edi+LD_BPB+BytesPerSec]
  3556 0000A99D F7E1                <1> 	mul	ecx
  3557                              <1> 	;sub	edx, edx
  3558                              <1> csftdf2_set_df_percent_wsize2:
  3559 0000A99F A3[9C400100]        <1> 	mov	[csftdf_w_size], eax
  3560                              <1> 
  3561 0000A9A4 A1[84400100]        <1> 	mov	eax, [csftdf_filesize]
  3562                              <1> 
  3563 0000A9A9 3D00000100          <1> 	cmp	eax, 65536 ; 64KB	; small file
  3564 0000A9AE 721F                <1> 	jb	short csftdf2_load_file ; do not display percentage
  3565                              <1> 	
  3566                              <1> csftdf2_reset_wf_percent_ptr_chk_64k:
  3567 0000A9B0 B201                <1> 	mov	dl, 1 ; 25/03/2016
  3568                              <1> 
  3569 0000A9B2 3D00000400          <1> 	cmp	eax, 65536*4 ; 256KB
  3570 0000A9B7 7310                <1> 	jnb	short csftdf2_enable_percentage_display ; big file
  3571                              <1> 
  3572                              <1> 	; 64-128KB file size for floppy disks
  3573 0000A9B9 3815[583F0100]      <1> 	cmp	byte [SourceFile_Drv], dl ; 1 ; read from floppy disk ?
  3574 0000A9BF 7608                <1> 	jna	short csftdf2_enable_percentage_display
  3575                              <1> 
  3576 0000A9C1 3815[D83F0100]      <1> 	cmp	byte [DestinationFile_Drv], dl ; 1 ; write to floppy disk ?
  3577 0000A9C7 7706                <1> 	ja	short csftdf2_load_file
  3578                              <1> 
  3579                              <1> csftdf2_enable_percentage_display:	
  3580 0000A9C9 8815[A8400100]      <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 0000A9CF B40F                <1> 	mov	ah, 0Fh
  3588 0000A9D1 E8B56AFFFF          <1> 	call	_int10h
  3589                              <1> 	; 13/05/2016
  3590 0000A9D6 883D[A9400100]      <1> 	mov	[csftdf_videopage], bh ; active video page
  3591 0000A9DC B403                <1> 	mov	ah, 03h
  3592 0000A9DE E8A86AFFFF          <1> 	call	_int10h
  3593 0000A9E3 668915[AA400100]    <1> 	mov	[csftdf_cursorpos], dx
  3594                              <1> 
  3595 0000A9EA 29C0                <1> 	sub	eax, eax
  3596 0000A9EC A2[81400100]        <1> 	mov	[csftdf_rw_err], al ; 0 
  3597                              <1> 
  3598                              <1> ; ///
  3599                              <1> csftdf_sf_amb: ; 15/03/2016
  3600 0000A9F1 8B0D[84400100]      <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 0000A9F7 E804AAFFFF          <1> 	call	allocate_memory_block
  3613 0000A9FC 7304                <1> 	jnc	short loc_check_sf_save_loading_parms
  3614                              <1> 
  3615 0000A9FE 29C0                <1> 	sub	eax, eax
  3616 0000AA00 29C9                <1> 	sub	ecx, ecx
  3617                              <1> 	
  3618                              <1> loc_check_sf_save_loading_parms:
  3619 0000AA02 A3[88400100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  3620 0000AA07 890D[8C400100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  3621                              <1> ; ///   
  3622                              <1> 	; 19/03/2016
  3623 0000AA0D 8B35[AC400100]      <1> 	mov	esi, [csftdf_sf_drv_dt] ; logical dos drv desc. tbl.
  3624                              <1> 
  3625                              <1> 	; 17/03/2016
  3626 0000AA13 09C0                <1> 	or	eax, eax ; contiguous free memory block address 
  3627 0000AA15 0F845B010000        <1>         jz      csftdf2_read_sf_cluster
  3628                              <1> 
  3629                              <1> 	; 18/03/2016
  3630 0000AA1B 8B1D[88400100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3631                              <1> 
  3632 0000AA21 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3633 0000AA25 0F8605020000        <1>         jna     csftdf2_load_fs_file
  3634                              <1> 
  3635                              <1> csftdf2_load_fat_file:
  3636 0000AA2B 53                  <1> 	push	ebx ; *
  3637                              <1> 
  3638                              <1> csftdf2_load_fat_file_next:
  3639 0000AA2C BE[65F60000]        <1> 	mov	esi, msg_reading
  3640 0000AA31 E83BB2FFFF          <1> 	call	print_msg
  3641                              <1> 
  3642 0000AA36 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3643 0000AA3D 7605                <1> 	jna	short csftdf2_load_fat_file_1
  3644                              <1> 	
  3645 0000AA3F E87C000000          <1> 	call	csftdf2_print_percentage ; 19/03/2016
  3646                              <1> 
  3647                              <1> csftdf2_load_fat_file_1:
  3648 0000AA44 8B35[AC400100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3649 0000AA4A 5B                  <1> 	pop	ebx ; *
  3650                              <1> 
  3651                              <1> csftdf2_load_fat_file_2:
  3652 0000AA4B E8B8000000          <1> 	call	csftdf2_read_fat_file_sectors ; 19/03/2016
  3653 0000AA50 0F8250040000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  3654                              <1> 
  3655 0000AA56 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3656 0000AA58 7520                <1> 	jnz	short csftdf2_load_fat_file_ok
  3657                              <1> 
  3658 0000AA5A 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3659 0000AA61 76E8                <1> 	jna	short csftdf2_load_fat_file_2
  3660                              <1> 
  3661 0000AA63 53                  <1> 	push	ebx ; *	
  3662                              <1> 
  3663                              <1> 	; Set cursor position
  3664                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3665 0000AA64 8A3D[A9400100]      <1> 	mov	bh, [csftdf_videopage]
  3666 0000AA6A 668B15[AA400100]    <1> 	mov	dx, [csftdf_cursorpos]
  3667 0000AA71 B402                <1> 	mov	ah, 2
  3668 0000AA73 E8136AFFFF          <1> 	call	_int10h
  3669 0000AA78 EBB2                <1> 	jmp	short csftdf2_load_fat_file_next
  3670                              <1> 	
  3671                              <1> csftdf2_load_fat_file_ok:
  3672 0000AA7A 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3673 0000AA81 0F8651020000        <1>         jna     csftdf2_save_file ; 25/03/2016
  3674                              <1> 	
  3675                              <1> 	; "Reading... 100%"
  3676 0000AA87 BF[7DF60000]        <1> 	mov	edi, percentagestr
  3677 0000AA8C B031                <1> 	mov	al, '1'
  3678 0000AA8E AA                  <1> 	stosb
  3679 0000AA8F B030                <1> 	mov	al, '0'
  3680 0000AA91 AA                  <1> 	stosb
  3681 0000AA92 AA                  <1> 	stosb
  3682                              <1> 
  3683 0000AA93 8A3D[A9400100]      <1> 	mov	bh, [csftdf_videopage]
  3684 0000AA99 668B15[AA400100]    <1> 	mov	dx, [csftdf_cursorpos]
  3685 0000AAA0 B402                <1> 	mov	ah, 2
  3686 0000AAA2 E8E469FFFF          <1> 	call	_int10h
  3687                              <1> 
  3688 0000AAA7 BE[65F60000]        <1> 	mov	esi, msg_reading
  3689 0000AAAC E8C0B1FFFF          <1> 	call	print_msg
  3690                              <1> 	
  3691 0000AAB1 BE[7DF60000]        <1> 	mov	esi, percentagestr
  3692 0000AAB6 E8B6B1FFFF          <1> 	call	print_msg
  3693                              <1> 
  3694 0000AABB 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 0000AAC0 B020                <1> 	mov	al, 20h
  3700 0000AAC2 BF[7DF60000]        <1> 	mov	edi, percentagestr
  3701 0000AAC7 AA                  <1> 	stosb
  3702 0000AAC8 AA                  <1> 	stosb
  3703 0000AAC9 A1[A0400100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3704 0000AACE BA64000000          <1> 	mov	edx, 100
  3705 0000AAD3 F7E2                <1> 	mul	edx
  3706 0000AAD5 8B0D[84400100]      <1> 	mov	ecx, [csftdf_filesize]	
  3707 0000AADB F7F1                <1> 	div	ecx
  3708 0000AADD B10A                <1> 	mov	cl, 10
  3709 0000AADF F6F1                <1> 	div	cl
  3710 0000AAE1 80C430              <1> 	add	ah, '0'
  3711 0000AAE4 8827                <1> 	mov	[edi], ah
  3712 0000AAE6 20C0                <1> 	and	al, al
  3713 0000AAE8 740A                <1> 	jz	short csftdf2_print_percent_1
  3714 0000AAEA 4F                  <1> 	dec	edi
  3715 0000AAEB 6698                <1> 	cbw
  3716 0000AAED F6F1                <1> 	div	cl
  3717 0000AAEF 80C430              <1> 	add	ah, '0'
  3718 0000AAF2 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 0000AAF4 BE[7DF60000]        <1> 	mov	esi, percentagestr
  3726                              <1> 	;call	print_msg
  3727                              <1> 	;retn
  3728 0000AAF9 E973B1FFFF          <1> 	jmp	print_msg
  3729                              <1> 
  3730                              <1> csftdf2_read_file_sectors:
  3731                              <1> 	; 19/03/2016
  3732 0000AAFE 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3733 0000AB02 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 0000AB08 8B15[84400100]      <1> 	mov	edx, [csftdf_filesize]
  3745 0000AB0E 2B15[A0400100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  3746 0000AB14 3B15[98400100]      <1> 	cmp	edx, [csftdf_r_size]	
  3747 0000AB1A 7306                <1> 	jnb	short csftdf2_read_fat_file_secs_1
  3748 0000AB1C 8915[98400100]      <1> 	mov	[csftdf_r_size], edx
  3749                              <1> 		
  3750                              <1> csftdf2_read_fat_file_secs_1:
  3751 0000AB22 A1[98400100]        <1> 	mov	eax, [csftdf_r_size]
  3752 0000AB27 29D2                <1> 	sub	edx, edx
  3753 0000AB29 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3754 0000AB2D 01C8                <1> 	add	eax, ecx
  3755 0000AB2F 48                  <1> 	dec	eax
  3756 0000AB30 F7F1                <1> 	div	ecx
  3757 0000AB32 89C1                <1> 	mov	ecx, eax ; sector count
  3758 0000AB34 A1[90400100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3759                              <1> 
  3760                              <1> 	; EBX = memory block address (current)
  3761                              <1> 	
  3762 0000AB39 E821090000          <1> 	call	read_fat_file_sectors
  3763 0000AB3E 7235                <1> 	jc	short csftdf2_read_fat_file_secs_3
  3764                              <1> 
  3765                              <1> 	; EBX = next memory address
  3766                              <1> 
  3767 0000AB40 A1[A0400100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3768 0000AB45 0305[98400100]      <1> 	add	eax, [csftdf_r_size]
  3769 0000AB4B 8B15[84400100]      <1> 	mov	edx, [csftdf_filesize]
  3770 0000AB51 39D0                <1> 	cmp	eax, edx
  3771 0000AB53 7320                <1> 	jnb	short csftdf2_read_fat_file_secs_3 ; edx > 0
  3772 0000AB55 A3[A0400100]        <1> 	mov	[csftdf_sf_rbytes], eax
  3773                              <1> 
  3774 0000AB5A 53                  <1> 	push	ebx ; *
  3775                              <1> 	; get next cluster (csftdf_r_size! bytes)
  3776 0000AB5B A1[90400100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3777 0000AB60 E8CC060000          <1> 	call	get_next_cluster
  3778 0000AB65 5B                  <1> 	pop	ebx ; *
  3779 0000AB66 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 0000AB68 B811000000          <1> 	mov	eax, 17 ; Read error !
  3784 0000AB6D C3                  <1> 	retn
  3785                              <1> 
  3786                              <1> csftdf2_read_fat_file_secs_2:
  3787 0000AB6E 29D2                <1> 	sub	edx, edx ; 0
  3788 0000AB70 A3[90400100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  3789                              <1> 
  3790                              <1> csftdf2_read_fat_file_secs_3:
  3791 0000AB75 C3                  <1> 	retn
  3792                              <1> 
  3793                              <1> csftdf2_read_sf_cluster:
  3794                              <1> 	; 19/03/2016
  3795 0000AB76 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3796                              <1> 
  3797 0000AB7B 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3798 0000AB82 760D                <1> 	jna	short csftdf2_read_sf_clust_2
  3799                              <1> 
  3800 0000AB84 53                  <1> 	push	ebx ; *	
  3801                              <1> 
  3802                              <1> csftdf2_read_sf_clust_next:
  3803 0000AB85 E836FFFFFF          <1> 	call	csftdf2_print_percentage
  3804                              <1> 
  3805                              <1> csftdf2_read_sf_clust_0:
  3806 0000AB8A 8B35[AC400100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3807                              <1> csftdf2_read_sf_clust_1:
  3808 0000AB90 5B                  <1> 	pop	ebx ; *
  3809                              <1> 
  3810                              <1> csftdf2_read_sf_clust_2:
  3811 0000AB91 89DA                <1> 	mov	edx, ebx
  3812 0000AB93 0315[98400100]      <1> 	add	edx, [csftdf_r_size]
  3813 0000AB99 81FA00000800        <1> 	cmp	edx, Cluster_Buffer + 65536
  3814 0000AB9F 772F                <1> 	ja	short csftdf2_write_df_cluster
  3815                              <1> 
  3816 0000ABA1 E858FFFFFF          <1> 	call	csftdf2_read_file_sectors ; 19/03/2016
  3817 0000ABA6 0F8280020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3818                              <1> 
  3819 0000ABAC 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3820 0000ABAE 7520                <1> 	jnz	short csftdf2_write_df_cluster
  3821                              <1> 
  3822 0000ABB0 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3823 0000ABB7 76D8                <1> 	jna	short csftdf2_read_sf_clust_2
  3824                              <1> 
  3825 0000ABB9 53                  <1> 	push	ebx ; *	
  3826                              <1> 
  3827                              <1> 	; Set cursor position
  3828                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3829 0000ABBA 8A3D[A9400100]      <1> 	mov	bh, [csftdf_videopage]
  3830 0000ABC0 668B15[AA400100]    <1> 	mov	dx, [csftdf_cursorpos]
  3831 0000ABC7 B402                <1> 	mov	ah, 2
  3832 0000ABC9 E8BD68FFFF          <1> 	call	_int10h
  3833 0000ABCE EBB5                <1> 	jmp	short csftdf2_read_sf_clust_next
  3834                              <1> 
  3835                              <1> csftdf2_write_df_cluster:
  3836                              <1> 	; 19/03/2016
  3837 0000ABD0 8B35[B0400100]      <1> 	mov	esi, [csftdf_df_drv_dt]	
  3838 0000ABD6 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3839                              <1> 
  3840                              <1> csftdf2_write_df_clust_next:
  3841 0000ABDB E855000000          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016
  3842 0000ABE0 0F8246020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3843                              <1> 
  3844 0000ABE6 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3845 0000ABE8 750A                <1> 	jnz	short csftdf2_rw_f_clust_ok
  3846                              <1> 
  3847 0000ABEA 81FB00000800        <1> 	cmp	ebx, Cluster_Buffer + 65536
  3848 0000ABF0 72E9                <1> 	jb	short csftdf2_write_df_clust_next
  3849                              <1> 	
  3850 0000ABF2 EB82                <1> 	jmp	short csftdf2_read_sf_cluster
  3851                              <1>  
  3852                              <1> csftdf2_rw_f_clust_ok:
  3853 0000ABF4 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3854 0000ABFB 0F86B2010000        <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  3855                              <1> 
  3856                              <1> 	; "100%"
  3857 0000AC01 BF[7DF60000]        <1> 	mov	edi, percentagestr
  3858 0000AC06 B031                <1> 	mov	al, '1'
  3859 0000AC08 AA                  <1> 	stosb
  3860 0000AC09 B030                <1> 	mov	al, '0'
  3861 0000AC0B AA                  <1> 	stosb
  3862 0000AC0C AA                  <1> 	stosb
  3863                              <1> 
  3864 0000AC0D 8A3D[A9400100]      <1> 	mov	bh, [csftdf_videopage]
  3865 0000AC13 668B15[AA400100]    <1> 	mov	dx, [csftdf_cursorpos]
  3866 0000AC1A B402                <1> 	mov	ah, 2
  3867 0000AC1C E86A68FFFF          <1> 	call	_int10h
  3868                              <1> 
  3869 0000AC21 BE[7DF60000]        <1> 	mov	esi, percentagestr
  3870 0000AC26 E846B0FFFF          <1> 	call	print_msg
  3871                              <1> 
  3872 0000AC2B E983010000          <1>         jmp     csftdf2_save_fat_file_4
  3873                              <1> 
  3874                              <1> csftdf2_load_fs_file:
  3875                              <1> 	; temporary - 18/03/2016
  3876 0000AC30 E96F020000          <1>         jmp     csftdf2_read_error
  3877                              <1> 
  3878                              <1> csftdf2_write_file_sectors:
  3879                              <1> 	; 19/03/2016
  3880 0000AC35 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3881 0000AC39 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 0000AC3F 8B15[84400100]      <1> 	mov	edx, [csftdf_filesize]
  3893 0000AC45 2B15[A4400100]      <1> 	sub	edx, [csftdf_df_wbytes]
  3894 0000AC4B 3B15[9C400100]      <1> 	cmp	edx, [csftdf_w_size]	
  3895 0000AC51 7306                <1> 	jnb	short csftdf2_write_fat_file_secs_1
  3896 0000AC53 8915[9C400100]      <1> 	mov	[csftdf_w_size], edx		
  3897                              <1> 
  3898                              <1> csftdf2_write_fat_file_secs_1:
  3899 0000AC59 A1[9C400100]        <1> 	mov	eax, [csftdf_w_size]
  3900 0000AC5E 29D2                <1> 	sub	edx, edx
  3901 0000AC60 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3902 0000AC64 01C8                <1> 	add	eax, ecx
  3903 0000AC66 48                  <1> 	dec	eax
  3904 0000AC67 F7F1                <1> 	div	ecx
  3905 0000AC69 89C1                <1> 	mov	ecx, eax ; sector count
  3906 0000AC6B A1[94400100]        <1> 	mov	eax, [csftdf_df_cluster]
  3907                              <1> 
  3908                              <1> 	; EBX = memory block address (current)	
  3909                              <1> 
  3910 0000AC70 E8A20F0000          <1> 	call	write_fat_file_sectors
  3911 0000AC75 7259                <1> 	jc	short csftdf2_write_fat_file_secs_4
  3912                              <1> 
  3913                              <1> 	; EBX = next memory address
  3914                              <1> 
  3915 0000AC77 A1[A4400100]        <1> 	mov	eax, [csftdf_df_wbytes]
  3916 0000AC7C 0305[9C400100]      <1> 	add	eax, [csftdf_w_size]
  3917 0000AC82 8B15[84400100]      <1> 	mov	edx, [csftdf_filesize]
  3918 0000AC88 39D0                <1> 	cmp	eax, edx
  3919 0000AC8A 7344                <1> 	jnb	short csftdf2_write_fat_file_secs_4
  3920 0000AC8C A3[A4400100]        <1> 	mov	[csftdf_df_wbytes], eax
  3921                              <1> 	;
  3922 0000AC91 A3[46400100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  3923                              <1> 
  3924 0000AC96 53                  <1> 	push	ebx ; *
  3925                              <1> 
  3926 0000AC97 803D[82400100]01    <1> 	cmp	byte [DestinationFileFound], 1
  3927 0000AC9E 7210                <1> 	jb	short csftdf2_write_fat_file_secs_2
  3928                              <1> 
  3929                              <1> 	; get next cluster (csftdf_w_size! bytes)
  3930 0000ACA0 A1[94400100]        <1> 	mov	eax, [csftdf_df_cluster]
  3931 0000ACA5 E887050000          <1> 	call	get_next_cluster
  3932 0000ACAA 731C                <1> 	jnc	short csftdf2_write_fat_file_secs_3
  3933                              <1> 
  3934 0000ACAC 21C0                <1> 	and	eax, eax ; end of cluster chain!?
  3935 0000ACAE 7521                <1> 	jnz	short csftdf2_write_fat_file_secs_5 ; disk error !
  3936                              <1> 
  3937                              <1> csftdf2_write_fat_file_secs_2:
  3938 0000ACB0 A1[94400100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  3939 0000ACB5 E8800E0000          <1> 	call	add_new_cluster		
  3940 0000ACBA 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 0000ACBC 8B15[9C400100]      <1> 	mov	edx, [csftdf_w_size] ; bytes per cluster
  3948 0000ACC2 0115[46400100]      <1> 	add	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  3949                              <1> 
  3950                              <1> csftdf2_write_fat_file_secs_3:
  3951 0000ACC8 5B                  <1> 	pop	ebx ; *
  3952 0000ACC9 29D2                <1> 	sub	edx, edx ; 0
  3953 0000ACCB A3[94400100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  3954                              <1> 
  3955                              <1> csftdf2_write_fat_file_secs_4:
  3956 0000ACD0 C3                  <1> 	retn
  3957                              <1> 
  3958                              <1> csftdf2_write_fat_file_secs_5:
  3959 0000ACD1 5B                  <1> 	pop	ebx ; *
  3960                              <1> 	; 16/10/2016 (1Dh -> 18)
  3961 0000ACD2 B812000000          <1> 	mov	eax, 18 ; Write error !
  3962 0000ACD7 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 0000ACD8 8B35[B0400100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; logical dos drv desc. tbl.
  3969                              <1> 
  3970 0000ACDE 8B1D[88400100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3971                              <1> 
  3972 0000ACE4 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3973 0000ACE8 0F86F4010000        <1>         jna     csftdf2_save_fs_file
  3974                              <1> 
  3975                              <1> csftdf2_save_fat_file:
  3976 0000ACEE 53                  <1> 	push	ebx; *
  3977                              <1> 
  3978 0000ACEF 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3979 0000ACF6 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 0000ACF8 8A3D[A9400100]      <1> 	mov	bh, [csftdf_videopage]
  3984 0000ACFE 668B15[AA400100]    <1> 	mov	dx, [csftdf_cursorpos]
  3985 0000AD05 B402                <1> 	mov	ah, 2
  3986 0000AD07 E87F67FFFF          <1> 	call	_int10h
  3987                              <1> 	
  3988 0000AD0C BE[71F60000]        <1> 	mov	esi, msg_writing
  3989 0000AD11 E85BAFFFFF          <1> 	call	print_msg
  3990                              <1> 
  3991                              <1> csftdf2_save_fat_file_next:
  3992 0000AD16 8B35[B0400100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 25/03/2016
  3993                              <1> 
  3994                              <1> csftdf2_save_fat_file_0:
  3995 0000AD1C 5B                  <1> 	pop	ebx ; *
  3996                              <1> 
  3997                              <1> csftdf2_save_fat_file_1:
  3998 0000AD1D E813FFFFFF          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016	
  3999 0000AD22 0F827E010000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  4000                              <1> 
  4001 0000AD28 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  4002 0000AD2A 756D                <1>         jnz     short csftdf2_save_fat_file_3 ; 25/03/2016
  4003                              <1> 
  4004 0000AD2C 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4005 0000AD33 76E8                <1> 	jna	short csftdf2_save_fat_file_1
  4006                              <1> 
  4007 0000AD35 B020                <1> 	mov	al, 20h
  4008 0000AD37 BF[7DF60000]        <1> 	mov	edi, percentagestr
  4009 0000AD3C AA                  <1> 	stosb
  4010 0000AD3D AA                  <1> 	stosb
  4011 0000AD3E A1[A4400100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4012 0000AD43 BA64000000          <1> 	mov	edx, 100
  4013 0000AD48 F7E2                <1> 	mul	edx
  4014 0000AD4A 8B0D[84400100]      <1> 	mov	ecx, [csftdf_filesize]	
  4015 0000AD50 F7F1                <1> 	div	ecx
  4016 0000AD52 B10A                <1> 	mov	cl, 10
  4017 0000AD54 F6F1                <1> 	div	cl
  4018 0000AD56 80C430              <1> 	add	ah, '0'
  4019 0000AD59 8827                <1> 	mov	[edi], ah
  4020 0000AD5B 20C0                <1> 	and	al, al
  4021 0000AD5D 740A                <1> 	jz	short csftdf2_save_fat_file_2
  4022 0000AD5F 4F                  <1> 	dec	edi
  4023 0000AD60 6698                <1> 	cbw
  4024 0000AD62 F6F1                <1> 	div	cl
  4025 0000AD64 80C430              <1> 	add	ah, '0'
  4026 0000AD67 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 0000AD69 53                  <1> 	push	ebx ; *
  4034                              <1> 
  4035 0000AD6A E802000000          <1> 	call	csftdf2_print_wr_percentage ; 25/03/2016
  4036                              <1> 
  4037 0000AD6F 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 0000AD71 8A3D[A9400100]      <1> 	mov	bh, [csftdf_videopage]
  4043 0000AD77 668B15[AA400100]    <1> 	mov	dx, [csftdf_cursorpos]
  4044 0000AD7E B402                <1> 	mov	ah, 2
  4045 0000AD80 E80667FFFF          <1> 	call	_int10h
  4046                              <1> 
  4047 0000AD85 BE[71F60000]        <1> 	mov	esi, msg_writing
  4048 0000AD8A E8E2AEFFFF          <1> 	call	print_msg
  4049                              <1> 
  4050 0000AD8F BE[7DF60000]        <1> 	mov	esi, percentagestr
  4051                              <1> 	;call	print_msg
  4052                              <1> 	;retn
  4053 0000AD94 E9D8AEFFFF          <1> 	jmp	print_msg
  4054                              <1> 
  4055                              <1> csftdf2_save_fat_file_3:
  4056 0000AD99 803D[A8400100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4057 0000ADA0 7611                <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  4058                              <1> 
  4059                              <1> 	; "100%"
  4060 0000ADA2 BF[7DF60000]        <1> 	mov	edi, percentagestr
  4061 0000ADA7 B031                <1> 	mov	al, '1'
  4062 0000ADA9 AA                  <1> 	stosb
  4063 0000ADAA B030                <1> 	mov	al, '0'
  4064 0000ADAC AA                  <1> 	stosb
  4065 0000ADAD AA                  <1> 	stosb
  4066                              <1> 
  4067 0000ADAE E8BEFFFFFF          <1> 	call	csftdf2_print_wr_percentage
  4068                              <1> 
  4069                              <1> csftdf2_save_fat_file_4:
  4070 0000ADB3 803D[82400100]00    <1> 	cmp	byte [DestinationFileFound], 0
  4071 0000ADBA 7647                <1> 	jna	short csftdf2_save_fat_file_6
  4072                              <1> 
  4073 0000ADBC 8B35[B0400100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 31/03/2016	
  4074                              <1> 
  4075 0000ADC2 A1[94400100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  4076 0000ADC7 E865040000          <1> 	call	get_next_cluster
  4077 0000ADCC 7235                <1> 	jc	short csftdf2_save_fat_file_6 ; eocc! or disk error!
  4078                              <1> 
  4079 0000ADCE A1[94400100]        <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 0000ADD3 B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4085 0000ADD8 E87E070000          <1> 	call	update_cluster
  4086 0000ADDD 7224                <1> 	jc	short csftdf2_save_fat_file_6 ; really last cluster!?
  4087                              <1> 
  4088 0000ADDF A3[94400100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  4089                              <1> 	
  4090                              <1> 	; byte [FAT_BuffValidData] = 2 
  4091 0000ADE4 E82F0A0000          <1> 	call	save_fat_buffer
  4092 0000ADE9 730E                <1> 	jnc	short csftdf2_save_fat_file_5
  4093                              <1> 	
  4094 0000ADEB 8B15[84400100]      <1> 	mov	edx, [csftdf_filesize]
  4095 0000ADF1 8915[46400100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4096 0000ADF7 EB58                <1> 	jmp	short csftdf2_save_fat_file_err3
  4097                              <1> 
  4098                              <1> csftdf2_save_fat_file_5:
  4099 0000ADF9 A1[94400100]        <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 0000ADFE E8580C0000          <1> 	call	truncate_cluster_chain
  4104                              <1> 
  4105                              <1> csftdf2_save_fat_file_6:
  4106                              <1> 	; 28/03/2016
  4107 0000AE03 BE[B53F0100]        <1> 	mov	esi, SourceFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4108 0000AE08 BF[35400100]        <1> 	mov	edi, DestinationFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4109 0000AE0D A4                  <1> 	movsb ; +11
  4110 0000AE0E A5                  <1> 	movsd ; +12 .. +15
  4111 0000AE0F 66A5                <1> 	movsw ; +16 .. +17
  4112                              <1> 		; + 18
  4113 0000AE11 83C604              <1> 	add	esi, 4
  4114 0000AE14 83C704              <1> 	add	edi, 4
  4115 0000AE17 A5                  <1> 	movsd	; DirEntry_WrtTime ; +22 .. +25
  4116                              <1> 
  4117 0000AE18 8B15[84400100]      <1> 	mov	edx, [csftdf_filesize]
  4118 0000AE1E 8915[46400100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4119                              <1> 
  4120 0000AE24 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 0000AE29 EB4D                <1> 	jmp	short csftdf2_save_fat_file_7
  4124                              <1> 
  4125                              <1> csftdf2_save_fat_file_err1:
  4126 0000AE2B 5B                  <1> 	pop	ebx ; *	
  4127                              <1> csftdf2_save_fat_file_err2:
  4128 0000AE2C A1[A4400100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4129 0000AE31 8B15[46400100]      <1> 	mov	edx, [DestinationFile_DirEntry+DirEntry_FileSize]
  4130 0000AE37 39C2                <1> 	cmp	edx, eax
  4131 0000AE39 7616                <1> 	jna	short csftdf2_save_fat_file_err3
  4132 0000AE3B A1[94400100]        <1> 	mov	eax, [csftdf_df_cluster] ; last (empty) cluster
  4133                              <1> 	; ESI = Logical dos drive description table address
  4134 0000AE40 E8160C0000          <1> 	call	truncate_cluster_chain
  4135 0000AE45 720A                <1> 	jc	short csftdf2_save_fat_file_err3
  4136 0000AE47 A1[A4400100]        <1> 	mov	eax, [csftdf_df_wbytes]	
  4137 0000AE4C A3[46400100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  4138                              <1> csftdf2_save_fat_file_err3:
  4139 0000AE51 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 0000AE56 C605[37400100]00    <1> 	mov	byte [DestinationFile_DirEntry+DirEntry_CrtTimeTenth], 0
  4143 0000AE5D 66A3[38400100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtTime], ax
  4144 0000AE63 668915[3A400100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtDate], dx		
  4145 0000AE6A 66A3[40400100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtTime], ax
  4146 0000AE70 668915[42400100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtDate], dx
  4147 0000AE77 F9                  <1> 	stc
  4148                              <1> csftdf2_save_fat_file_7:
  4149 0000AE78 9C                  <1> 	pushf
  4150 0000AE79 668915[3C400100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_LastAccDate], dx
  4151 0000AE80 BE[2A400100]        <1> 	mov	esi, DestinationFile_DirEntry
  4152 0000AE85 BF00000800          <1> 	mov	edi, Directory_Buffer
  4153 0000AE8A 0FB70D[52400100]    <1> 	movzx	ecx, word [DestinationFile_DirEntryNumber] ; (<2048)
  4154 0000AE91 66C1E105            <1> 	shl	cx, 5 ; 32 * directory entry number
  4155 0000AE95 01CF                <1> 	add	edi, ecx
  4156                              <1> 	;mov	ecx, 8
  4157 0000AE97 66B90800            <1> 	mov	cx, 8
  4158 0000AE9B F3A5                <1> 	rep	movsd
  4159 0000AE9D 9D                  <1> 	popf
  4160 0000AE9E 730B                <1> 	jnc	short csftdf2_write_file_OK
  4161                              <1> 	 		
  4162                              <1> csftdf2_write_error:
  4163                              <1> 	; 18/03/2016
  4164 0000AEA0 B01D                <1> 	mov	al, 1Dh ; write error
  4165 0000AEA2 EB02                <1> 	jmp	short csftdf2_rw_error
  4166                              <1> 
  4167                              <1> 	; 16/03/2016
  4168                              <1> csftdf2_read_error:
  4169 0000AEA4 B011                <1> 	mov	al, 17 ; ; Drive not ready or read error!
  4170                              <1> csftdf2_rw_error:
  4171 0000AEA6 A2[81400100]        <1> 	mov	[csftdf_rw_err], al 
  4172                              <1> 
  4173                              <1> csftdf2_write_file_OK:
  4174                              <1> 	; 18/03/2016
  4175 0000AEAB C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  4176 0000AEB2 E8C7F0FFFF          <1> 	call	save_directory_buffer
  4177                              <1> 
  4178                              <1>  	; Update last modification date&time of destination
  4179                              <1> 	; file's (parent) directory
  4180 0000AEB7 E85DF1FFFF          <1> 	call	update_parent_dir_lmdt
  4181                              <1> 	;
  4182 0000AEBC A1[88400100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  4183                              <1> 
  4184 0000AEC1 21C0                <1> 	and	eax, eax
  4185 0000AEC3 750E                <1> 	jnz	short csftdf2_dealloc_mblock
  4186                              <1> 
  4187 0000AEC5 88C5                <1> 	mov	ch, al ; 0 (Cluster r/w, not full loading)
  4188                              <1> csftdf2_dealloc_retn:
  4189 0000AEC7 8A0D[81400100]      <1> 	mov	cl, [csftdf_rw_err]
  4190 0000AECD A1[94400100]        <1> 	mov	eax, [csftdf_df_cluster]
  4191 0000AED2 C3                  <1> 	retn
  4192                              <1> 
  4193                              <1> csftdf2_dealloc_mblock:
  4194 0000AED3 8B0D[8C400100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  4195 0000AED9 E823A7FFFF          <1> 	call	deallocate_memory_block
  4196 0000AEDE B5FF                <1>         mov     ch, 0FFh ; (File was full loaded at memory)
  4197 0000AEE0 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 0000AEE2 B812000000          <1> 	mov	eax, 18 ; write error
  4203 0000AEE7 F9                  <1> 	stc
  4204 0000AEE8 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 0000AEE9 80E107              <1> 	and	cl, 07h ; S, H, R
  4232 0000AEEC 880D[D0400100]      <1>         mov     [createfile_attrib], cl 
  4233                              <1> 
  4234 0000AEF2 89D9                <1> 	mov	ecx, ebx
  4235 0000AEF4 89F3                <1> 	mov	ebx, esi ; ASCIIZ File Name address
  4236 0000AEF6 29D2                <1> 	sub	edx, edx
  4237 0000AEF8 8A35[6E340100]      <1>         mov     dh, [Current_Drv]
  4238 0000AEFE BE00010900          <1>         mov     esi, Logical_DOSDisks
  4239 0000AF03 01D6                <1> 	add	esi, edx
  4240                              <1> 
  4241 0000AF05 8815[DB400100]      <1> 	mov	[createfile_UpdatePDir], dl ; 0 ; 31/03/2016 
  4242                              <1> 
  4243                              <1> 	; LD_DiskType = 0 for write protection (read only) 
  4244 0000AF0B 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  4245 0000AF0F 730A                <1> 	jnb	short loc_createfile_check_file_sytem
  4246                              <1> 	; 16/10/2016 (TRDOS Error code: 30, disk write protected) 
  4247 0000AF11 B81E000000          <1> 	mov	eax, 30 ; 13h, MSDOS err : Disk write-protected 
  4248 0000AF16 66BA0000            <1> 	mov	dx, 0
  4249                              <1> 	; err retn: EDX = 0, EBX = File name offset
  4250                              <1> 	; ESI -> Dos drive description table address	
  4251 0000AF1A 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 0000AF1B 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  4260 0000AF1F 730A                <1> 	jnb	short loc_createfile_chk_empty_FAT_file_sign1
  4261                              <1> 
  4262 0000AF21 A3[BC400100]        <1> 	mov	[createfile_size], eax
  4263                              <1> 	; ESI = Logical Dos Drive Description Table address
  4264                              <1> 	; EBX = ASCIIZ File Name address
  4265 0000AF26 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 0000AF2B 41                  <1> 	inc	ecx
  4270 0000AF2C 7506                <1> 	jnz	short loc_createfile_chk_empty_FAT_file_sign2
  4271 0000AF2E 890D[BC400100]      <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 0000AF34 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec]
  4276 0000AF38 66890D[D8400100]    <1> 	mov	[createfile_BytesPerSec], cx
  4277                              <1> 	
  4278                              <1> 	; EBX = ASCIIZ File Name address
  4279 0000AF3F 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  4280 0000AF43 8815[D1400100]      <1> 	mov	[createfile_SecPerClust], dl
  4281 0000AF49 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  4282 0000AF4C 39D1                <1> 	cmp	ecx, edx ; byte [createfile_SecPerClust]
  4283 0000AF4E 7306                <1> 	jnb	short loc_create_fat_file
  4284                              <1> 	  
  4285                              <1> loc_createfile_insufficient_disk_space:
  4286 0000AF50 B827000000          <1> 	mov	eax, 27h
  4287                              <1> loc_createfile_gffc_retn:
  4288 0000AF55 C3                  <1> 	retn
  4289                              <1> 
  4290                              <1> loc_create_fat_file:
  4291 0000AF56 891D[B4400100]      <1> 	mov	[createfile_Name_Offset], ebx
  4292 0000AF5C 890D[B8400100]      <1> 	mov	[createfile_FreeSectors], ecx
  4293                              <1> 
  4294                              <1> loc_createfile_gffc_1:
  4295 0000AF62 E821050000          <1> 	call	get_first_free_cluster
  4296 0000AF67 72EC                <1> 	jc	short loc_createfile_gffc_retn
  4297                              <1> 
  4298 0000AF69 A3[C0400100]        <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 0000AF6E 56                  <1> 	push	esi ; *
  4307 0000AF6F 31C0                <1> 	xor	eax, eax
  4308                              <1> 
  4309 0000AF71 A3[8E3C0100]        <1> 	mov	dword [FAT_ClusterCounter], eax ; 0
  4310                              <1> 	; 21/03/2016
  4311 0000AF76 A2[DA400100]        <1> 	mov	byte [createfile_wfc], al ; 0 
  4312                              <1> 
  4313 0000AF7B 89C1                <1>  	mov	ecx, eax
  4314 0000AF7D 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 0000AF7F E8D6E7FFFF          <1> 	call	locate_current_dir_file
  4319 0000AF84 0F83EE000000        <1> 	jnc	loc_createfile_set_ff_dir_entry
  4320 0000AF8A 5E                  <1> 	pop	esi ; *
  4321                              <1> 	 ; ESI = Logical DOS Drv. Description Table Address 
  4322 0000AF8B 83F802              <1> 	cmp	eax, 2
  4323 0000AF8E 7402                <1> 	je	short loc_createfile_add_new_cluster
  4324                              <1> loc_createfile_locate_file_stc_retn:
  4325 0000AF90 F9                  <1> 	stc
  4326 0000AF91 C3                  <1> 	retn
  4327                              <1> 
  4328                              <1> loc_createfile_add_new_cluster:
  4329 0000AF92 803D[6D340100]02    <1> 	cmp	byte [Current_FATType], 2
  4330                              <1> 	;cmp	byte [esi+LD_FATType], 2
  4331 0000AF99 770C                <1> 	ja	short loc_createfile_add_new_cluster_check_fsc
  4332 0000AF9B 803D[6C340100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  4333                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  4334 0000AFA2 7303                <1> 	jnb	short loc_createfile_add_new_cluster_check_fsc
  4335                              <1> 	
  4336                              <1> 	;mov	eax, 12
  4337 0000AFA4 B00C                <1> 	mov	al, 12 ; No more files 
  4338                              <1> 
  4339                              <1> loc_createfile_anc_retn:
  4340 0000AFA6 C3                  <1> 	retn
  4341                              <1> 
  4342                              <1> loc_createfile_add_new_cluster_check_fsc:
  4343 0000AFA7 8B0D[B8400100]      <1> 	mov	ecx, [createfile_FreeSectors]
  4344 0000AFAD 0FB605[D1400100]    <1> 	movzx	eax, byte [createfile_SecPerClust]
  4345 0000AFB4 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  4346 0000AFB7 39C1                <1> 	cmp	ecx, eax
  4347 0000AFB9 7295                <1>         jb	short loc_createfile_insufficient_disk_space
  4348                              <1> 
  4349                              <1> loc_createfile_add_new_subdir_cluster:
  4350 0000AFBB 8B15[9D3C0100]      <1> 	mov	edx, [DirBuff_Cluster]
  4351 0000AFC1 8915[C4400100]      <1> 	mov	[createfile_LastDirCluster], edx	
  4352                              <1> 
  4353 0000AFC7 A1[C0400100]        <1> 	mov	eax, [createfile_FFCluster]
  4354 0000AFCC E846040000          <1> 	call	load_FAT_sub_directory 
  4355 0000AFD1 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 0000AFD3 0FB705[D8400100]    <1> 	movzx	eax, word [createfile_BytesPerSec] ; 23/03/2016
  4360 0000AFDA F7E1                <1> 	mul	ecx ; ecx = directory buffer sector count
  4361 0000AFDC 89C1                <1> 	mov	ecx, eax
  4362 0000AFDE C1E902              <1> 	shr	ecx, 2 ; dword count
  4363 0000AFE1 29C0                <1> 	sub	eax, eax ; 0
  4364 0000AFE3 F3AB                <1> 	rep	stosd 
  4365                              <1> 	;
  4366 0000AFE5 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4367 0000AFEC E88DEFFFFF          <1> 	call	save_directory_buffer
  4368 0000AFF1 72B3                <1> 	jc	short loc_createfile_anc_retn
  4369                              <1> 
  4370                              <1> loc_createfile_save_added_subdir_cluster:
  4371 0000AFF3 A1[C4400100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4372 0000AFF8 8B0D[C0400100]      <1> 	mov	ecx, [createfile_FFCluster]
  4373 0000AFFE E858050000          <1> 	call	update_cluster
  4374 0000B003 7304                <1> 	jnc	short loc_createfile_save_fat_buffer_0
  4375 0000B005 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4376 0000B007 751A                <1> 	jnz	short loc_createfile_save_fat_buffer_stc_retn
  4377                              <1> 
  4378                              <1> loc_createfile_save_fat_buffer_0:
  4379 0000B009 A1[C0400100]        <1> 	mov	eax, [createfile_FFCluster]
  4380 0000B00E A3[C4400100]        <1> 	mov	[createfile_LastDirCluster], eax
  4381 0000B013 B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh ; 28 bit
  4382 0000B018 E83E050000          <1> 	call	update_cluster
  4383 0000B01D 7306                <1> 	jnc	short loc_createfile_save_fat_buffer_1
  4384 0000B01F 09C0                <1> 	or	eax, eax ; Was it free cluster
  4385 0000B021 7402                <1> 	jz	short loc_createfile_save_fat_buffer_1
  4386                              <1> 
  4387                              <1> loc_createfile_save_fat_buffer_stc_retn:
  4388 0000B023 F9                  <1> 	stc
  4389                              <1> loc_createfile_save_fat_buffer_retn:
  4390                              <1> loc_createfile_gffc_2_stc_retn:
  4391 0000B024 C3                  <1> 	retn
  4392                              <1> 
  4393                              <1> loc_createfile_save_fat_buffer_1:
  4394                              <1> 	; byte [FAT_BuffValidData] = 2 
  4395 0000B025 E8EE070000          <1> 	call	save_fat_buffer
  4396 0000B02A 72F8                <1> 	jc	short loc_createfile_save_fat_buffer_retn
  4397                              <1> 
  4398 0000B02C 803D[8E3C0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4399 0000B033 7222                <1> 	jb	short loc_createfile_save_fat_buffer_2
  4400                              <1> 
  4401                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4402 0000B035 A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4403                              <1> 
  4404 0000B03A C605[8E3C0100]00    <1> 	mov	byte [FAT_ClusterCounter], 0 ; 21/03/2016
  4405                              <1> 
  4406 0000B041 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4407 0000B045 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 0000B04A 09C9                <1> 	or	ecx, ecx 
  4414 0000B04C 7409                <1> 	jz	short loc_createfile_save_fat_buffer_2
  4415                              <1> 
  4416 0000B04E 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4417 0000B052 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 0000B057 E82C040000          <1> 	call	get_first_free_cluster
  4424 0000B05C 72C6                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4425                              <1> 
  4426 0000B05E A3[C0400100]        <1> 	mov	[createfile_FFCluster], eax
  4427                              <1> 
  4428 0000B063 A1[C4400100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4429                              <1> 	
  4430 0000B068 E8AA030000          <1> 	call	load_FAT_sub_directory 
  4431 0000B06D 72B5                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4432                              <1> 
  4433 0000B06F BF00000800          <1> 	mov	edi, Directory_Buffer
  4434                              <1> 
  4435 0000B074 6629DB              <1> 	sub	bx, bx ; directory entry index/number = 0
  4436                              <1> 
  4437 0000B077 56                  <1> 	push	esi ; * ; 23/03/2016
  4438                              <1> 
  4439                              <1> loc_createfile_set_ff_dir_entry:
  4440 0000B078 66891D[D2400100]    <1> 	mov	[createfile_DirIndex], bx
  4441                              <1> 
  4442                              <1>         ; EDI = Directory entry address
  4443 0000B07F 8B35[B4400100]      <1> 	mov	esi, [createfile_Name_Offset]
  4444 0000B085 A1[C0400100]        <1> 	mov	eax, [createfile_FFCluster]
  4445 0000B08A A3[C8400100]        <1> 	mov	[createfile_Cluster], eax ; 24/03/2016
  4446 0000B08F B5FF                <1> 	mov	ch, 0FFh
  4447 0000B091 8A0D[D0400100]      <1>         mov	cl, [createfile_attrib] ; file attributes
  4448                              <1> 	; CH > 0 -> File size is in [EBX]
  4449 0000B097 BB[BC400100]        <1> 	mov	ebx, createfile_size
  4450                              <1>   
  4451 0000B09C E800EEFFFF          <1> 	call	make_directory_entry
  4452                              <1> 	
  4453 0000B0A1 5E                  <1> 	pop	esi ; * ; ESI = Logical Dos Drv Desc. Table address
  4454                              <1> 
  4455 0000B0A2 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4456 0000B0A9 E8D0EEFFFF          <1> 	call	save_directory_buffer
  4457 0000B0AE 7221                <1> 	jc	short loc_createfile_set_ff_dir_entry_retn
  4458                              <1> 
  4459 0000B0B0 C605[DB400100]01    <1> 	mov	byte [createfile_UpdatePDir], 1 ; 31/03/2016 
  4460                              <1> 
  4461                              <1> loc_createfile_get_set_write_file_cluster:
  4462 0000B0B7 A1[BC400100]        <1> 	mov	eax, [createfile_size]
  4463 0000B0BC 09C0                <1> 	or	eax, eax
  4464 0000B0BE 7570                <1> 	jnz	short loc_createfile_get_set_wfc_cont
  4465 0000B0C0 40                  <1> 	inc	eax
  4466                              <1> 	; 23/03/2016
  4467 0000B0C1 0FB61D[D1400100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4468                              <1> 	;movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 512
  4469 0000B0C8 0FB70D[D8400100]    <1>         movzx   ecx, word [createfile_BytesPerSec] ; 512
  4470 0000B0CF EB7C                <1> 	jmp	loc_createfile_set_cluster_count 
  4471                              <1> 
  4472                              <1> loc_createfile_set_ff_dir_entry_retn:
  4473 0000B0D1 C3                  <1> 	retn
  4474                              <1> 
  4475                              <1> loc_createfile_write_fcluster_to_disk:
  4476 0000B0D2 034668              <1> 	add	eax, [esi+LD_DATABegin] ; convert to physical address
  4477 0000B0D5 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 0000B0DA E88B380000          <1> 	call	disk_write
  4483 0000B0DF 7211                <1> 	jc	short loc_createfile_dsk_wr_err
  4484                              <1> 
  4485                              <1> loc_createfile_update_fat_cluster:
  4486                              <1> 	; 21/03/2016	
  4487 0000B0E1 803D[DA400100]00    <1> 	cmp	byte [createfile_wfc], 0 
  4488 0000B0E8 7712                <1> 	ja	short loc_createfile_update_fat_cluster_n1
  4489                              <1> 
  4490 0000B0EA FE05[DA400100]      <1> 	inc	byte [createfile_wfc] ; 1
  4491 0000B0F0 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 0000B0F2 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  4497 0000B0F7 E9BD000000          <1> 	jmp	loc_createfile_stc_retn
  4498                              <1> 
  4499                              <1> loc_createfile_update_fat_cluster_n1:
  4500 0000B0FC A1[CC400100]        <1> 	mov	eax, [createfile_PCluster]
  4501 0000B101 8B0D[C8400100]      <1> 	mov	ecx, [createfile_Cluster]
  4502 0000B107 E84F040000          <1> 	call	update_cluster
  4503 0000B10C 7308                <1> 	jnc	short loc_createfile_update_fat_cluster_n2
  4504 0000B10E 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4505 0000B110 0F85A3000000        <1> 	jnz	loc_createfile_stc_retn
  4506                              <1> 
  4507                              <1> loc_createfile_update_fat_cluster_n2:
  4508 0000B116 A1[C8400100]        <1>         mov	eax, [createfile_Cluster]
  4509 0000B11B B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4510 0000B120 E836040000          <1> 	call	update_cluster
  4511 0000B125 734E                <1> 	jnc	short loc_createfile_save_fat_buffer_3
  4512 0000B127 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4513 0000B129 744A                <1> 	jz	short loc_createfile_save_fat_buffer_3
  4514                              <1> 
  4515                              <1> loc_createfile_upd_fat_fcluster_stc_retn:
  4516 0000B12B 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 0000B130 0FB70D[D8400100]    <1> 	movzx	ecx, word [createfile_BytesPerSec] ; 512
  4521 0000B137 01C8                <1> 	add	eax, ecx
  4522 0000B139 48                  <1> 	dec	eax  ; add eax, 511
  4523 0000B13A 29D2                <1> 	sub	edx, edx
  4524 0000B13C F7F1                <1> 	div	ecx
  4525 0000B13E 0FB61D[D1400100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4526 0000B145 01D8                <1> 	add	eax, ebx
  4527 0000B147 48                  <1> 	dec	eax  ; add eax, SecPerClust - 1
  4528 0000B148 6631D2              <1> 	xor	dx, dx
  4529 0000B14B F7F3                <1> 	div	ebx
  4530                              <1> 
  4531                              <1> loc_createfile_set_cluster_count:
  4532 0000B14D A3[D4400100]        <1> 	mov 	[createfile_CCount], eax
  4533                              <1> 	
  4534 0000B152 BF00000700          <1> 	mov	edi, Cluster_Buffer
  4535 0000B157 89C8                <1> 	mov	eax, ecx ; Bytes per Sector
  4536 0000B159 F7E3                <1> 	mul	ebx ; Sectors per Cluster 
  4537                              <1> 	; EAX = Bytes per Cluster
  4538 0000B15B 89C1                <1> 	mov	ecx, eax
  4539 0000B15D C1E902              <1> 	shr	ecx, 2 ; dword count
  4540 0000B160 31C0                <1> 	xor	eax, eax
  4541 0000B162 F3AB                <1> 	rep	stosd ; clear cluster buffer
  4542                              <1> 
  4543 0000B164 A1[C8400100]        <1> 	mov	eax, [createfile_Cluster] ; 24/03/2016
  4544                              <1> 
  4545 0000B169 89D9                <1> 	mov	ecx, ebx
  4546                              <1> 
  4547                              <1> loc_createfile_get_set_wf_fclust_cont:
  4548 0000B16B 83E802              <1> 	sub	eax, 2
  4549 0000B16E F7E1                <1> 	mul	ecx
  4550                              <1> 	; EAX = Logical DOS disk address (offset)
  4551 0000B170 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 0000B175 E89E060000          <1> 	call	save_fat_buffer
  4556 0000B17A 723D                <1> 	jc	loc_createfile_stc_retn
  4557                              <1> 
  4558                              <1> 	; 21/03/2016
  4559 0000B17C 803D[8E3C0100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4560 0000B183 721B                <1> 	jb	short loc_createfile_save_fat_buffer_4
  4561                              <1> 
  4562                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4563 0000B185 A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4564 0000B18A 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4565 0000B18E 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 0000B193 09C9                <1> 	or	ecx, ecx 
  4572 0000B195 7409                <1> 	jz	short loc_createfile_save_fat_buffer_4
  4573                              <1> 
  4574 0000B197 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4575 0000B19B E80D070000          <1> 	call	calculate_fat_freespace
  4576                              <1> 
  4577                              <1> loc_createfile_save_fat_buffer_4:
  4578 0000B1A0 FF0D[D4400100]      <1> 	dec	dword [createfile_CCount]
  4579                              <1> 	;jz	short loc_createfile_upd_dir_modif_date_time
  4580 0000B1A6 743F                <1> 	jz	short loc_createfile_stc_retn_cc ; 31/03/2016
  4581                              <1> 
  4582                              <1> loc_createfile_get_set_write_next_cluster:
  4583 0000B1A8 E8DB020000          <1> 	call	get_first_free_cluster
  4584 0000B1AD 720A                <1> 	jc	short loc_createfile_stc_retn
  4585                              <1> 
  4586                              <1> loc_createfile_get_set_write_next_cluster_1:
  4587 0000B1AF 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  4588 0000B1B2 7213                <1> 	jb	short loc_createfile_get_set_write_next_cluster_2
  4589                              <1> 
  4590                              <1> loc_createfile_wnc_insufficient_disk_space:	
  4591 0000B1B4 B827000000          <1> 	mov	eax, 27h ; Insufficient disk space
  4592                              <1> 
  4593                              <1> loc_createfile_stc_retn:
  4594 0000B1B9 803D[DA400100]01    <1> 	cmp	byte [createfile_wfc], 1
  4595 0000B1C0 7324                <1> 	jnb	short loc_createfile_err_retn
  4596 0000B1C2 C3                  <1> 	retn
  4597                              <1> 
  4598                              <1> loc_createfile_wnc_inv_format_retn:
  4599                              <1> 	;mov	eax, 28
  4600 0000B1C3 B01C                <1> 	mov	al, 28 ; Invalid format
  4601 0000B1C5 EBF2                <1> 	jmp	short loc_createfile_stc_retn
  4602                              <1> 	         
  4603                              <1> loc_createfile_get_set_write_next_cluster_2:
  4604 0000B1C7 83F802              <1> 	cmp	eax, 2
  4605 0000B1CA 72F7                <1> 	jb	short loc_createfile_wnc_inv_format_retn
  4606                              <1> 
  4607                              <1> loc_createfile_get_set_write_next_cluster_3:
  4608 0000B1CC 8B0D[C8400100]      <1> 	mov	ecx, [createfile_Cluster]
  4609 0000B1D2 A3[C8400100]        <1> 	mov	[createfile_Cluster], eax
  4610 0000B1D7 890D[CC400100]      <1> 	mov	[createfile_PCluster], ecx
  4611 0000B1DD 0FB60D[D1400100]    <1> 	movzx	ecx, byte [createfile_SecPerClust]
  4612 0000B1E4 EB85                <1> 	jmp	short loc_createfile_get_set_wf_fclust_cont
  4613                              <1> 
  4614                              <1> loc_createfile_err_retn:
  4615 0000B1E6 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 0000B1E7 9C                  <1> 	pushf	; cpu is here for an error return or completion 
  4620 0000B1E8 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 0000B1E9 A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4626 0000B1EE 09C0                <1> 	or	eax, eax
  4627 0000B1F0 741A                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4628 0000B1F2 8A3D[6E340100]      <1> 	mov	bh, [Current_Drv]
  4629 0000B1F8 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 0000B1FA 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 0000B1FF 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  4636 0000B201 7409                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4637                              <1> 
  4638                              <1> loc_createfile_stc_retn_recalc_FAT_freespace:
  4639 0000B203 66BB00FF            <1> 	mov	bx, 0FF00h ; bh = 0FFh -> 
  4640                              <1> 	; ESI = Logical DOS Drv DT Addr
  4641                              <1> 	; BL = 0 -> Recalculate 
  4642 0000B207 E8A1060000          <1> 	call	calculate_fat_freespace
  4643                              <1> 
  4644                              <1> loc_createfile_stc_retn_pop_eax:
  4645 0000B20C 58                  <1> 	pop	eax
  4646 0000B20D 9D                  <1> 	popf
  4647 0000B20E 7218                <1> 	jc	short loc_createfile_retn
  4648                              <1> 
  4649                              <1> loc_createfile_retn_fcluster:
  4650 0000B210 A1[C0400100]        <1> 	mov	eax, [createfile_FFCluster]
  4651 0000B215 BB[BC400100]        <1> 	mov	ebx, createfile_size
  4652                              <1> 	;movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  4653 0000B21A 0FB60D[D1400100]    <1> 	movzx	ecx, byte [createfile_SecPerClust] ; 23/03/2016
  4654 0000B221 0FB715[D2400100]    <1> 	movzx	edx, word [createfile_DirIndex]
  4655                              <1> 
  4656                              <1> loc_createfile_retn:
  4657 0000B228 C3                  <1> 	retn
  4658                              <1> 
  4659                              <1> create_fs_file:
  4660                              <1> 	; temporary (21/03/2016)
  4661 0000B229 C3                  <1> 	retn
  4662                              <1> 
  4663                              <1> delete_fs_file:
  4664                              <1> 	; temporary (28/02/2016)
  4665 0000B22A C3                  <1> 	retn
  4666                              <1> 
  4667                              <1> rename_fs_file_or_directory:
  4668 0000B22B C3                  <1> 	retn
  4669                              <1> 
  4670                              <1> make_fs_directory:
  4671                              <1> 	; temporary (21/02/2016)
  4672 0000B22C C3                  <1> 	retn
  4673                              <1> 
  4674                              <1> add_new_fs_section:
  4675                              <1> 	; temporary (11/03/2016)
  4676 0000B22D C3                  <1> 	retn
  4677                              <1> 
  4678                              <1> delete_fs_directory_entry:
  4679                              <1> 	; temporary (11/03/2016)
  4680 0000B22E C3                  <1> 	retn
  4681                              <1> 
  4682                              <1> csftdf2_read_fs_file_sectors:
  4683                              <1> 	; temporary (19/03/2016)
  4684 0000B22F C3                  <1> 	retn
  4685                              <1> 
  4686                              <1> csftdf2_write_fs_file_sectors:
  4687                              <1> 	; temporary (19/03/2016)
  4688 0000B230 C3                  <1> 	retn
  2158                                  %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 0000B231 A3[823C0100]        <1> 	mov	[FAT_CurrentCluster], eax
    35                              <1> check_next_cluster_fat_type:
    36 0000B236 29D2                <1> 	sub	edx, edx ; 0
    37 0000B238 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
    38 0000B23C 7250                <1> 	jb	short get_FAT12_next_cluster
    39 0000B23E 0F87AF000000        <1>         ja      get_FAT32_next_cluster
    40                              <1> get_FAT16_next_cluster:
    41 0000B244 BB00030000          <1> 	mov	ebx, 300h ;768
    42 0000B249 F7F3                <1> 	div	ebx
    43                              <1> 	; EAX = Count of 3 FAT sectors
    44                              <1> 	; EDX = Cluster Offset (< 768)
    45 0000B24B 66D1E2              <1> 	shl	dx, 1 ; Multiply by 2
    46 0000B24E 89D3                <1> 	mov	ebx, edx ; Byte Offset
    47 0000B250 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    48 0000B256 66BA0300            <1> 	mov	dx, 3
    49 0000B25A F7E2                <1> 	mul	edx  
    50                              <1> 	; EAX = FAT Sector (<= 256)
    51                              <1> 	; EDX = 0
    52 0000B25C 8A0E                <1> 	mov	cl, [esi+LD_Name]
    53 0000B25E 803D[863C0100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    54 0000B265 0F86CC000000        <1>         jna     load_FAT_sectors0
    55 0000B26B 3A0D[873C0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    56 0000B271 0F85C0000000        <1>         jne     load_FAT_sectors0
    57 0000B277 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
    58 0000B27D 0F85BA000000        <1>         jne     load_FAT_sectors1
    59                              <1> 	;movzx	eax, word [ebx]
    60 0000B283 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 0000B286 6683F8F7            <1> 	cmp	ax, 0FFF7h
    70 0000B28A 725A                <1> 	jb	short loc_pass_gnc_FAT16_eoc_check
    71                              <1> 	; ax >= FFF7h (cluster 0002h to FFF6h is valid, in use)
    72 0000B28C EB56                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
    73                              <1> 
    74                              <1> get_FAT12_next_cluster:
    75 0000B28E BB00040000          <1> 	mov	ebx, 400h ;1024
    76 0000B293 F7F3                <1> 	div	ebx
    77                              <1> 	; EAX = Count of 3 FAT sectors
    78                              <1> 	; EDX = Cluster Offset (< 1024)
    79 0000B295 6650                <1> 	push	ax
    80 0000B297 66B80300            <1> 	mov	ax, 3	
    81 0000B29B 66F7E2              <1> 	mul	dx    	; Multiply by 3
    82 0000B29E 66D1E8              <1> 	shr	ax, 1	; Divide by 2
    83 0000B2A1 6689C3              <1>         mov	bx, ax 	; Byte Offset
    84 0000B2A4 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    85 0000B2AA 6658                <1> 	pop	ax
    86 0000B2AC 66BA0300            <1> 	mov	dx, 3
    87 0000B2B0 F7E2                <1> 	mul	edx 
    88                              <1> 	; EAX = FAT Sector (<= 12)
    89                              <1> 	; EDX = 0
    90 0000B2B2 8A0E                <1> 	mov	cl, [esi+LD_Name]
    91 0000B2B4 803D[863C0100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    92 0000B2BB 767A                <1> 	jna	short load_FAT_sectors0
    93 0000B2BD 3A0D[873C0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    94 0000B2C3 7572                <1> 	jne	short load_FAT_sectors0
    95 0000B2C5 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
    96 0000B2CB 7570                <1> 	jne	short load_FAT_sectors1
    97 0000B2CD A1[823C0100]        <1> 	mov	eax, [FAT_CurrentCluster]
    98 0000B2D2 66D1E8              <1> 	shr	ax, 1
    99                              <1> 	;movzx	eax, word [ebx]
   100 0000B2D5 668B03              <1> 	mov	ax, [ebx]
   101 0000B2D8 7314                <1> 	jnc	short get_FAT12_nc_even
   102 0000B2DA 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 0000B2DE 663DF70F            <1> 	cmp	ax, 0FF7h
   109 0000B2E2 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 0000B2E4 31C0                <1> 	xor	eax, eax ; 0
   114                              <1> loc_pass_gnc_FAT16_eoc_check:
   115                              <1> loc_pass_gnc_FAT32_eoc_check:
   116 0000B2E6 8B0D[823C0100]      <1> 	mov	ecx, [FAT_CurrentCluster]
   117 0000B2EC F5                  <1> 	cmc
   118 0000B2ED C3                  <1> 	retn
   119                              <1> 
   120                              <1> get_FAT12_nc_even:
   121 0000B2EE 80E40F              <1> 	and	ah, 0Fh
   122 0000B2F1 EBEB                <1> 	jmp	short loc_gnc_fat12_eoc_check
   123                              <1> 
   124                              <1> get_FAT32_next_cluster:
   125 0000B2F3 BB80010000          <1> 	mov	ebx, 180h ;384
   126 0000B2F8 F7F3                <1> 	div	ebx
   127                              <1> 	; EAX = Count of 3 FAT sectors
   128                              <1> 	; EDX = Cluster Offset (< 384)
   129 0000B2FA 66C1E202            <1> 	shl	dx, 2	; Multiply by 4
   130 0000B2FE 89D3                <1> 	mov	ebx, edx ; Byte Offset
   131 0000B300 81C3001C0900        <1> 	add	ebx, FAT_Buffer
   132 0000B306 66BA0300            <1> 	mov	dx, 3
   133 0000B30A 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 0000B30C 8A0E                <1> 	mov	cl, [esi+LD_Name]
   139 0000B30E 803D[863C0100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
   140 0000B315 7620                <1> 	jna	short load_FAT_sectors0
   141 0000B317 3A0D[873C0100]      <1> 	cmp	cl, [FAT_BuffDrvName]
   142 0000B31D 7518                <1> 	jne	short load_FAT_sectors0
   143 0000B31F 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector] ; 0, 3, 6, 9 ...
   144 0000B325 7516                <1> 	jne	short load_FAT_sectors1
   145 0000B327 8B03                <1> 	mov	eax, [ebx]
   146 0000B329 25FFFFFF0F          <1>  	and	eax, 0FFFFFFFh ; 28 bit Cluster
   147 0000B32E 3DF7FFFF0F          <1> 	cmp	eax, 0FFFFFF7h
   148 0000B333 72B1                <1> 	jb	short loc_pass_gnc_FAT32_eoc_check
   149                              <1> 	; eax >= FFFFFF7h (cluster 0002h to FFFFFF6h is valid)
   150 0000B335 EBAD                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
   151                              <1> 
   152                              <1> load_FAT_sectors0:
   153 0000B337 880D[873C0100]      <1> 	mov	[FAT_BuffDrvName], cl
   154                              <1> load_FAT_sectors1:
   155 0000B33D A3[8A3C0100]        <1> 	mov	[FAT_BuffSector], eax
   156 0000B342 89C3                <1> 	mov	ebx, eax
   157 0000B344 034660              <1>         add     eax, [esi+LD_FATBegin]
   158 0000B347 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   159 0000B34B 7706                <1>         ja      short load_FAT_sectors3
   160 0000B34D 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
   161 0000B351 EB03                <1> 	jmp	short load_FAT_sectors4
   162                              <1> load_FAT_sectors3:
   163 0000B353 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+BPB_FATSz32]
   164                              <1> load_FAT_sectors4:
   165 0000B356 29D9                <1> 	sub	ecx, ebx ; [FAT_BuffSector]
   166 0000B358 83F903              <1>         cmp     ecx, 3
   167 0000B35B 7605                <1>         jna     short load_FAT_sectors5
   168 0000B35D B903000000          <1> 	mov	ecx, 3
   169                              <1> load_FAT_sectors5:
   170 0000B362 BB001C0900          <1> 	mov	ebx, FAT_Buffer
   171 0000B367 E80D360000          <1> 	call	disk_read
   172 0000B36C 730D                <1> 	jnc	short load_FAT_sectors_ok
   173                              <1> 	; 15/10/2016 (15h -> 17)
   174                              <1> 	; 23/03/2016 (15h)
   175 0000B36E B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   176 0000B373 C605[863C0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   177 0000B37A C3                  <1> 	retn
   178                              <1> load_FAT_sectors_ok:
   179 0000B37B C605[863C0100]01    <1> 	mov	byte [FAT_BuffValidData], 1
   180 0000B382 A1[823C0100]        <1> 	mov	eax, [FAT_CurrentCluster]
   181 0000B387 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 0000B38C 8A1E                <1> 	mov	bl, [esi+LD_Name]
   208 0000B38E 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   209                              <1> 
   210                              <1> 	;mov	[DirBuff_DRV], bl
   211                              <1> 	;mov	[DirBuff_FATType], bh
   212 0000B391 66891D[963C0100]    <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 0000B398 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 0000B39C 6681FA0002          <1> 	cmp	dx, 512 ; Number of Root Dir Entries
   224 0000B3A1 7414                <1> 	je	short lrd_mov_ecx_32
   225 0000B3A3 89D0                <1> 	mov	eax, edx
   226                              <1> 	; 23/10/2016
   227 0000B3A5 89C1                <1> 	mov	ecx, eax
   228 0000B3A7 6683C10F            <1> 	add	cx, 15 ; round up 
   229 0000B3AB 66C1E904            <1> 	shr	cx, 4  ; 16 entries per sector (512/32)
   230                              <1> 	; ecx = Root directory size in sectors
   231 0000B3AF 66C1E005            <1> 	shl	ax, 5 ; Root directory size in bytes
   232 0000B3B3 664A                <1> 	dec	dx    ; Last entry number of root dir
   233                              <1> 	; cx = Dir Buffer sector count             
   234 0000B3B5 EB0B                <1> 	jmp	short lrd_check_dir_buffer
   235                              <1> 
   236                              <1> lrd_mov_ecx_32:
   237 0000B3B7 B920000000          <1> 	mov	ecx, 32
   238 0000B3BC 664A                <1> 	dec	dx ; 511
   239 0000B3BE 66B80040            <1> 	mov	ax, 32*512 
   240                              <1>  
   241                              <1> lrd_check_dir_buffer:
   242 0000B3C2 29DB                <1> 	sub	ebx, ebx ; 0
   243 0000B3C4 881D[983C0100]      <1> 	mov	[DirBuff_ValidData], bl ; 0
   244 0000B3CA 668915[9B3C0100]    <1> 	mov	[DirBuff_LastEntry], dx
   245 0000B3D1 891D[9D3C0100]      <1> 	mov	[DirBuff_Cluster], ebx ; 0
   246 0000B3D7 66A3[A13C0100]      <1> 	mov	[DirBuffer_Size], ax
   247                              <1> 
   248 0000B3DD 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin]
   249                              <1> read_directory:
   250 0000B3E0 BB00000800          <1> 	mov	ebx, Directory_Buffer
   251 0000B3E5 51                  <1> 	push	ecx ; Directory buffer sector count
   252 0000B3E6 53                  <1> 	push	ebx
   253 0000B3E7 E88D350000          <1> 	call	disk_read
   254 0000B3EC 5B                  <1> 	pop	ebx
   255 0000B3ED 720B                <1> 	jc	short load_DirBuff_error
   256                              <1> 
   257                              <1> validate_DirBuff_and_return:
   258 0000B3EF 59                  <1> 	pop	ecx ; Number of loaded sectors
   259 0000B3F0 C605[983C0100]01    <1> 	mov	byte [DirBuff_ValidData], 1
   260 0000B3F7 31C0                <1> 	xor	eax, eax ; 0 = no error
   261 0000B3F9 C3                  <1> 	retn
   262                              <1> 
   263                              <1> load_DirBuff_error:
   264 0000B3FA 89C8                <1> 	mov	eax, ecx ; remaining sectors
   265 0000B3FC 59                  <1> 	pop	ecx ; sector count
   266 0000B3FD 29C1                <1> 	sub	ecx, eax ; Number of loaded sectors
   267                              <1> 	; 15/10/2016 (15h -> 17)
   268 0000B3FF B811000000          <1> 	mov	eax, 17 ; DRV NOT READY OR READ ERROR !
   269 0000B404 F9                  <1> 	stc
   270 0000B405 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 0000B406 8A1E                <1> 	mov	bl, [esi+LD_Name]
   289 0000B408 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   290                              <1> 
   291                              <1> 	;mov	[DirBuff_DRV], bl
   292                              <1> 	;mov	[DirBuff_FATType], bh
   293 0000B40B 66891D[963C0100]    <1> 	mov	[DirBuff_DRV], bx
   294                              <1> 
   295                              <1> load_FAT32_root_dir0:
   296 0000B412 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   297 0000B415 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 0000B417 8A1E                <1> 	mov	bl, [esi+LD_Name]
   319 0000B419 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   320                              <1> 
   321                              <1> 	;mov	[DirBuff_DRV], bl
   322                              <1> 	;mov	[DirBuff_FATType], bh
   323 0000B41C 66891D[963C0100]    <1> 	mov	[DirBuff_DRV], bx
   324                              <1> 
   325                              <1> load_FAT_sub_dir0:
   326 0000B423 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
   327                              <1> 
   328 0000B427 882D[983C0100]      <1> 	mov	[DirBuff_ValidData], ch ; 0
   329 0000B42D A3[9D3C0100]        <1> 	mov	[DirBuff_Cluster], eax
   330                              <1> 
   331 0000B432 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
   332 0000B436 F7E1                <1> 	mul	ecx
   333 0000B438 C1E805              <1> 	shr	eax, 5 ; directory entry count (dir size / 32)
   334 0000B43B 6648                <1> 	dec	ax ; last entry
   335 0000B43D 66A3[9B3C0100]      <1> 	mov	[DirBuff_LastEntry], ax
   336                              <1> 
   337 0000B443 A1[9D3C0100]        <1> 	mov	eax, [DirBuff_Cluster]
   338 0000B448 83E802              <1> 	sub	eax, 2
   339 0000B44B F7E1                <1> 	mul	ecx
   340 0000B44D 034668              <1> 	add	eax, [esi+LD_DATABegin]
   341                              <1> 	; ecx = sector per cluster (dir buffer size = 32 sectors)
   342 0000B450 EB8E                <1> 	jmp	short read_directory
   343                              <1> 
   344                              <1> ; DRV_FS.ASM
   345                              <1> 
   346                              <1> load_current_FS_directory:
   347 0000B452 C3                  <1> 	retn
   348                              <1> load_FS_root_directory:
   349 0000B453 C3                  <1> 	retn
   350                              <1> load_FS_sub_directory:
   351 0000B454 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 0000B455 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 0000B459 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
   378 0000B45D 761C                <1> 	jna	short read_fs_cluster
   379                              <1> 
   380                              <1> read_fat_file_sectors: ; 18/03/2016
   381 0000B45F 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
   382 0000B462 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
   383 0000B466 F7E2                <1> 	mul	edx
   384 0000B468 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 0000B46B E809350000          <1> 	call	disk_read
   393 0000B470 7306                <1> 	jnc	short rclust_retn
   394                              <1> 	
   395                              <1> 	; 15/10/2016 (15h -> 17)
   396 0000B472 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
   397 0000B477 C3                  <1> 	retn
   398                              <1> 
   399                              <1> rclust_retn:
   400 0000B478 29C0                <1> 	sub	eax, eax ; 0
   401 0000B47A 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 0000B47B B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
   416 0000B480 E801000000          <1> 	call	read_fs_sectors
   417 0000B485 C3                  <1> 	retn
   418                              <1> 
   419                              <1> read_fs_sectors:
   420                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   421 0000B486 F9                  <1> 	stc
   422 0000B487 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 0000B488 8B4678              <1> 	mov	eax, [esi+LD_Clusters]
   440 0000B48B 40                  <1> 	inc	eax ; add eax, 1
   441 0000B48C A3[203F0100]        <1> 	mov	[gffc_last_free_cluster], eax
   442                              <1> 
   443 0000B491 31DB                <1> 	xor	ebx, ebx ; 0 ; 02/03/2016
   444                              <1> 
   445 0000B493 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   446 0000B497 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 0000B499 E844060000          <1> 	call	get_fat32_fsinfo_sector_parms
   451 0000B49E 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 0000B4A0 89D0                <1> 	mov	eax, edx ; FSI_Next_Free (First Free Cluster)
   463 0000B4A2 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh ; invalid (unknown) !
   464 0000B4A5 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 0000B4A7 B802000000          <1> 	mov	eax, 2
   469                              <1> 	;xor	edx, edx
   470                              <1> 
   471                              <1> loc_gffc_get_first_fat_free_cluster1:
   472 0000B4AC 53                  <1> 	push	ebx ; 02/03/2016 
   473                              <1> 
   474                              <1> loc_gffc_get_first_fat_free_cluster2:   
   475 0000B4AD A3[1C3F0100]        <1> 	mov	[gffc_first_free_cluster], eax
   476 0000B4B2 A3[183F0100]        <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 0000B4B7 E875FDFFFF          <1> 	call	get_next_cluster
   484 0000B4BC 7307                <1> 	jnc	short loc_gffc_get_first_fat_free_cluster4
   485 0000B4BE 09C0                <1> 	or	eax, eax
   486 0000B4C0 740B                <1> 	jz	short loc_gffc_first_free_fat_cluster_next
   487 0000B4C2 5B                  <1> 	pop	ebx ; 02/03/2016
   488 0000B4C3 F5                  <1> 	cmc 	; stc
   489 0000B4C4 C3                  <1> 	retn
   490                              <1> 
   491                              <1> loc_gffc_get_first_fat_free_cluster4:
   492 0000B4C5 21C0                <1> 	and	eax, eax ; next cluster value
   493 0000B4C7 7504                <1> 	jnz	short loc_gffc_first_free_fat_cluster_next
   494 0000B4C9 89C8                <1> 	mov	eax, ecx ; current (previous cluster) value
   495 0000B4CB EB22                <1> 	jmp	short loc_gffc_check_for_set
   496                              <1>  
   497                              <1> loc_gffc_first_free_fat_cluster_next:
   498 0000B4CD A1[183F0100]        <1> 	mov	eax, [gffc_next_free_cluster]
   499 0000B4D2 3B05[203F0100]      <1> 	cmp	eax, [gffc_last_free_cluster]
   500 0000B4D8 7308                <1> 	jnb	short retn_stc_from_get_first_free_cluster
   501                              <1> pass_gffc_last_cluster_eax_check:
   502 0000B4DA 40                  <1> 	inc	eax ; add eax, 1
   503 0000B4DB A3[183F0100]        <1> 	mov	[gffc_next_free_cluster], eax
   504 0000B4E0 EBD5                <1> 	jmp	short loc_gffc_get_first_fat_free_cluster3
   505                              <1> 
   506                              <1> retn_stc_from_get_first_free_cluster:
   507 0000B4E2 A1[1C3F0100]        <1> 	mov	eax, [gffc_first_free_cluster]
   508 0000B4E7 83F802              <1> 	cmp	eax, 2
   509 0000B4EA 7709                <1> 	ja	short loc_gffc_check_previous_clusters
   510 0000B4EC 29C0                <1> 	sub	eax, eax
   511 0000B4EE 48                  <1> 	dec	eax ; FFFFFFFFh
   512                              <1> 
   513                              <1> loc_gffc_check_for_set:
   514                              <1> 	; 02/03/2016
   515 0000B4EF 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 0000B4F0 09DB                <1> 	or	ebx, ebx
   522 0000B4F2 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 0000B4F4 C3                  <1> 	retn
   531                              <1> 
   532                              <1> loc_gffc_check_previous_clusters:
   533 0000B4F5 48                  <1> 	dec	eax ; sub eax, 1
   534 0000B4F6 A3[203F0100]        <1> 	mov	[gffc_last_free_cluster], eax 
   535 0000B4FB B802000000          <1> 	mov	eax, 2
   536                              <1> 	;xor	edx, edx
   537 0000B500 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 0000B502 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 0000B505 813B52526141        <1> 	cmp     dword [ebx], 41615252h
   576 0000B50B 7540                <1> 	jne	short loc_sffc_read_fsinfo_sector
   577 0000B50D 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
   577 0000B516 61                  <1>
   578 0000B517 7534                <1> 	jne	short loc_sffc_read_fsinfo_sector
   579                              <1> 
   580 0000B519 3B83EC010000        <1> 	cmp	eax, [ebx+492]  ; FSI_Next_Free
   581 0000B51F 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 0000B521 8983EC010000        <1> 	mov	[ebx+492], eax
   587 0000B527 A1[303F0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC] 
   588 0000B52C B901000000          <1> 	mov	ecx, 1
   589 0000B531 53                  <1> 	push	ebx
   590 0000B532 E833340000          <1> 	call	disk_write
   591 0000B537 7208                <1> 	jc      short loc_sffc_read_fsinfo_sector_err1
   592 0000B539 5B                  <1> 	pop	ebx
   593                              <1> 
   594 0000B53A 8B83EC010000        <1> 	mov	eax, [ebx+492] ; First (Next) Free Cluster
   595                              <1> 
   596                              <1> loc_sffc_retn:
   597 0000B540 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 0000B541 BB00000000          <1> 	mov	ebx, 0
   605                              <1> 	; 15/10/2016 (1Dh -> 18)
   606                              <1> 	; 23/03/2016 (1Dh)
   607 0000B546 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
   608                              <1> 
   609                              <1> loc_sffc_read_fsinfo_sector_err2:
   610 0000B54B 5A                  <1> 	pop	edx
   611 0000B54C C3                  <1> 	retn
   612                              <1> 	
   613                              <1> loc_sffc_read_fsinfo_sector:
   614 0000B54D 50                  <1> 	push	eax
   615                              <1> 
   616 0000B54E E88F050000          <1> 	call	get_fat32_fsinfo_sector_parms
   617 0000B553 72F6                <1> 	jc	short loc_sffc_read_fsinfo_sector_err2
   618                              <1> 
   619 0000B555 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 0000B556 39D0                <1> 	cmp	eax, edx ; First free Cluster (eax = new value) 
   624 0000B558 75C7                <1> 	jne	short loc_sffc_write_fsinfo_sector
   625                              <1> 
   626 0000B55A 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 0000B55B A3[823C0100]        <1> 	mov	[FAT_CurrentCluster], eax
   662 0000B560 890D[243F0100]      <1> 	mov	[ClusterValue], ecx
   663                              <1> 
   664                              <1> loc_update_cluster_check_fat_buffer:
   665 0000B566 8A1E                <1> 	mov	bl, [esi+LD_Name]
   666 0000B568 381D[873C0100]      <1> 	cmp	[FAT_BuffDrvName], bl
   667 0000B56E 741A                <1> 	je	short loc_update_cluster_check_fat_type
   668 0000B570 803D[863C0100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
   669 0000B577 0F84C2000000        <1>         je      loc_uc_save_fat_buffer
   670                              <1> 
   671                              <1> loc_uc_reset_fat_buffer_validation:
   672 0000B57D C605[863C0100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   673                              <1> 
   674                              <1> loc_uc_check_fat_type_reset_drvname:
   675 0000B584 881D[873C0100]      <1> 	mov	[FAT_BuffDrvName], bl
   676                              <1> 
   677                              <1> loc_update_cluster_check_fat_type:
   678 0000B58A 29D2                <1> 	sub	edx, edx ; 26/02/2016
   679 0000B58C 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
   680 0000B58F 83F802              <1> 	cmp	eax, 2
   681 0000B592 0F82BE000000        <1>         jb      update_cluster_inv_data
   682 0000B598 80FB02              <1> 	cmp	bl, 2 
   683 0000B59B 0F877A010000        <1>         ja      update_fat32_cluster
   684                              <1> 	;cmp	bl, 1
   685                              <1> 	;jb	short update_cluster_inv_data
   686 0000B5A1 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   687 0000B5A4 41                  <1> 	inc	ecx  
   688 0000B5A5 890D[923C0100]      <1> 	mov	[LastCluster], ecx
   689 0000B5AB 39C8                <1> 	cmp	eax, ecx ; dword [LastCluster]
   690 0000B5AD 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 0000B5B3 80FB01              <1> 	cmp	bl, 1 ; correct comparison is this !
   699 0000B5B6 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 0000B5BC BB00030000          <1> 	mov	ebx, 300h ;768
   705 0000B5C1 F7F3                <1> 	div	ebx
   706                              <1> 	; EAX = Count of 3 FAT sectors
   707                              <1> 	; DX = Cluster offset in FAT buffer
   708 0000B5C3 6689D3              <1> 	mov	bx, dx  
   709 0000B5C6 66D1E3              <1> 	shl	bx, 1 ; Multiply by 2
   710 0000B5C9 66BA0300            <1> 	mov	dx, 3
   711 0000B5CD F7E2                <1> 	mul	edx  
   712                              <1> 	; EAX = FAT Sector
   713                              <1> 	; EDX = 0
   714                              <1> 	; EBX = Byte offset in FAT buffer
   715 0000B5CF 8A0D[863C0100]      <1> 	mov	cl, [FAT_BuffValidData]
   716 0000B5D5 80F902              <1> 	cmp	cl, 2
   717 0000B5D8 750A                <1> 	jne	short loc_uc_check_fat16_buff_sector_load
   718                              <1> 
   719                              <1> loc_uc_check_fat16_buff_sector_save:
   720 0000B5DA 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
   721 0000B5E0 755D                <1> 	jne	short loc_uc_save_fat_buffer
   722 0000B5E2 EB15                <1> 	jmp	short loc_update_fat16_cell
   723                              <1> 
   724                              <1> loc_uc_check_fat16_buff_sector_load:
   725 0000B5E4 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   726 0000B5E7 0F85FB010000        <1>         jne     loc_uc_load_fat_sectors
   727 0000B5ED 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
   728 0000B5F3 0F85EF010000        <1>         jne     loc_uc_load_fat_sectors
   729                              <1> 
   730                              <1> loc_update_fat16_cell:
   731                              <1> loc_update_fat16_buffer:
   732 0000B5F9 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   733                              <1> 	;movzx	eax, word [ebx]
   734 0000B5FF 668B03              <1> 	mov	ax, [ebx]
   735                              <1> 	; 01/03/2016
   736 0000B602 89C2                <1> 	mov	edx, eax ; old value of the cluster
   737 0000B604 A3[823C0100]        <1> 	mov	[FAT_CurrentCluster], eax
   738 0000B609 8B0D[243F0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   739 0000B60F 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   740                              <1> 
   741 0000B612 C605[863C0100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   742                              <1> 	
   743 0000B619 6683F802            <1> 	cmp	ax, 2
   744 0000B61D 723A                <1> 	jb	short return_uc_fat_stc
   745 0000B61F 3B05[923C0100]      <1> 	cmp	eax, [LastCluster]
   746 0000B625 7732                <1> 	ja	short return_uc_fat_stc
   747                              <1> 
   748                              <1> loc_fat_buffer_updated:
   749                              <1> 	; 01/03/2016
   750 0000B627 F8                  <1> 	clc
   751                              <1> loc_fat_buffer_stc_1:
   752 0000B628 9C                  <1> 	pushf
   753 0000B629 21C9                <1> 	and	ecx, ecx
   754 0000B62B 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 0000B62D FF05[8E3C0100]      <1> 	inc	dword [FAT_ClusterCounter]
   760                              <1> 
   761                              <1> loc_fat_buffer_updated_1: ; new value of the cluster > 0
   762 0000B633 09D2                <1> 	or	edx, edx ; 02/03/2016
   763 0000B635 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 0000B637 FF0D[8E3C0100]      <1> 	dec	dword [FAT_ClusterCounter] ; it may be negative number
   767                              <1> 
   768                              <1> loc_fat_buffer_updated_2:
   769 0000B63D 9D                  <1> 	popf
   770 0000B63E C3                  <1> 	retn
   771                              <1> 
   772                              <1> loc_uc_save_fat_buffer:
   773                              <1> 	; byte [FAT_BuffValidData] = 2 
   774 0000B63F E8D4010000          <1> 	call	save_fat_buffer
   775 0000B644 0F8297010000        <1>         jc      loc_fat_sectors_rw_error2
   776                              <1> 	;mov	byte [FAT_BuffValidData], 1
   777 0000B64A A1[823C0100]        <1> 	mov	eax, [FAT_CurrentCluster]
   778                              <1> 	;mov	ecx, [ClusterValue]
   779                              <1> 	;jmp	short loc_update_cluster_check_fat_buffer
   780 0000B64F 8A1E                <1> 	mov	bl, [esi+LD_Name] ; 01/03/2016
   781 0000B651 E927FFFFFF          <1>         jmp     loc_uc_reset_fat_buffer_validation
   782                              <1> 
   783                              <1> update_cluster_inv_data:
   784                              <1> 	;mov	eax, 0Dh
   785 0000B656 B00D                <1> 	mov	al, 0Dh  ; Invalid Data
   786 0000B658 C3                  <1> 	retn 
   787                              <1> 
   788                              <1> return_uc_fat_stc:
   789                              <1> 	; 01/03/2016
   790 0000B659 31C0                <1> 	xor	eax, eax
   791 0000B65B F9                  <1> 	stc
   792 0000B65C 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 0000B65E BB00040000          <1> 	mov	ebx, 400h ;1024
   798 0000B663 F7F3                <1> 	div	ebx
   799                              <1> 	; EAX = Count of 3 FAT sectors
   800                              <1> 	; DX = Cluster offset in FAT buffer
   801 0000B665 66B90300            <1> 	mov	cx, 3
   802 0000B669 6689C3              <1> 	mov	bx, ax
   803 0000B66C 6689C8              <1> 	mov	ax, cx ; 3
   804 0000B66F 66F7E2              <1> 	mul	dx     ; Multiply by 3
   805 0000B672 66D1E8              <1> 	shr	ax, 1  ; Divide by 2
   806 0000B675 6693                <1> 	xchg	bx, ax
   807                              <1> 	; EAX = Count of 3 FAT sectors
   808                              <1> 	; EBX = Byte Offset in FAT buffer   
   809 0000B677 66F7E1              <1> 	mul	cx  ; 3 * AX
   810                              <1> 	; EAX = FAT Beginning Sector
   811                              <1> 	; EDX = 0
   812 0000B67A 8A0D[863C0100]      <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 0000B680 80F902              <1> 	cmp	cl, 2 ; 2 = dirty buffer (must be written to disk)
   817 0000B683 750A                <1> 	jne	short loc_uc_check_fat12_buff_sector_load
   818                              <1> 
   819                              <1> loc_uc_check_fat12_buff_sector_save:
   820 0000B685 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
   821 0000B68B 75B2                <1>         jne     short loc_uc_save_fat_buffer
   822 0000B68D EB15                <1> 	jmp	short loc_update_fat12_cell
   823                              <1> 
   824                              <1> loc_uc_check_fat12_buff_sector_load:
   825 0000B68F 80F901              <1> 	cmp	cl, 1 ; byte ptr [FAT_BuffValidData]
   826 0000B692 0F8550010000        <1>         jne     loc_uc_load_fat_sectors
   827 0000B698 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
   828 0000B69E 0F8544010000        <1>         jne     loc_uc_load_fat_sectors
   829                              <1> 
   830                              <1> loc_update_fat12_cell:
   831 0000B6A4 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   832 0000B6AA 668B0D[823C0100]    <1> 	mov	cx, [FAT_CurrentCluster]
   833 0000B6B1 66D1E9              <1> 	shr	cx, 1
   834 0000B6B4 668B03              <1> 	mov	ax, [ebx]
   835 0000B6B7 6689C2              <1> 	mov	dx, ax
   836 0000B6BA 7344                <1> 	jnc	short uc_fat12_nc_even
   837                              <1> 
   838 0000B6BC 6683E00F            <1> 	and	ax, 0Fh
   839 0000B6C0 8B0D[243F0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   840 0000B6C6 66C1E104            <1> 	shl	cx, 4
   841 0000B6CA 6609C1              <1> 	or	cx, ax
   842 0000B6CD 6689D0              <1> 	mov	ax, dx
   843 0000B6D0 66890B              <1> 	mov	[ebx], cx  ; 16 bits !
   844 0000B6D3 66C1E804            <1> 	shr	ax, 4 ; al(bit4..7)+ah(bit0..7)
   845                              <1> 
   846                              <1> update_fat12_buffer:
   847 0000B6D7 A3[823C0100]        <1> 	mov	[FAT_CurrentCluster], eax
   848 0000B6DC 89C2                <1> 	mov	edx, eax ; 01/03/2016
   849 0000B6DE C605[863C0100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   850 0000B6E5 6683F802            <1> 	cmp	ax, 2
   851 0000B6E9 0F826AFFFFFF        <1>         jb      return_uc_fat_stc
   852 0000B6EF 3B05[923C0100]      <1> 	cmp	eax, [LastCluster]
   853 0000B6F5 0F875EFFFFFF        <1>         ja      return_uc_fat_stc
   854 0000B6FB E927FFFFFF          <1>         jmp     loc_fat_buffer_updated
   855                              <1> 
   856                              <1> uc_fat12_nc_even:
   857 0000B700 662500F0            <1> 	and	ax, 0F000h
   858 0000B704 8B0D[243F0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   859 0000B70A 80E50F              <1> 	and	ch, 0Fh
   860 0000B70D 6609C1              <1> 	or	cx, ax
   861 0000B710 6689D0              <1> 	mov	ax, dx
   862 0000B713 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   863 0000B716 80E40F              <1> 	and	ah, 0Fh ; al(bit0..7)+ah(bit0..3)
   864 0000B719 EBBC                <1> 	jmp	short update_fat12_buffer
   865                              <1> 
   866                              <1> update_fat32_cluster:
   867 0000B71B 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   868 0000B71E 41                  <1> 	inc	ecx
   869 0000B71F 890D[923C0100]      <1> 	mov	[LastCluster], ecx
   870                              <1> 
   871 0000B725 39C8                <1> 	cmp	eax, ecx
   872 0000B727 0F872CFFFFFF        <1>         ja      return_uc_fat_stc
   873                              <1> 
   874                              <1> pass_uc_fat32_errc:
   875                              <1> 	;sub	edx, edx
   876 0000B72D BB80010000          <1> 	mov	ebx, 180h ;384
   877 0000B732 F7F3                <1> 	div	ebx
   878                              <1> 	; EAX = Count of 3 FAT sectors
   879                              <1> 	; DX = Cluster offset in FAT buffer
   880 0000B734 89D3                <1> 	mov	ebx, edx
   881 0000B736 C1E302              <1> 	shl	ebx, 2 ; Multiply by 4
   882 0000B739 BA03000000          <1> 	mov	edx, 3	
   883 0000B73E F7E2                <1> 	mul	edx
   884                              <1> 	; EBX = Cluster Offset in FAT buffer
   885                              <1> 	; EAX = FAT Sector
   886                              <1> 	; EDX = 0
   887 0000B740 8A0D[863C0100]      <1> 	mov	cl, [FAT_BuffValidData]
   888 0000B746 80F902              <1> 	cmp	cl, 2
   889 0000B749 750E                <1> 	jne	short loc_uc_check_fat32_buff_sector_load
   890                              <1> 
   891                              <1> loc_uc_check_fat32_buff_sector_save:
   892 0000B74B 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
   893 0000B751 0F85E8FEFFFF        <1>         jne     loc_uc_save_fat_buffer
   894 0000B757 EB11                <1> 	jmp	short loc_update_fat32_cell
   895                              <1> 
   896                              <1> loc_uc_check_fat32_buff_sector_load:
   897 0000B759 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   898 0000B75C 0F8586000000        <1>         jne     loc_uc_load_fat_sectors
   899 0000B762 3B05[8A3C0100]      <1> 	cmp	eax, [FAT_BuffSector]
   900 0000B768 757E                <1>         jne     loc_uc_load_fat_sectors
   901                              <1> 
   902                              <1> loc_update_fat32_cell:
   903                              <1> loc_update_fat32_buffer:
   904 0000B76A 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   905 0000B770 8B03                <1> 	mov	eax, [ebx]
   906 0000B772 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh ; 28 bit cluster value
   907                              <1> 	
   908 0000B777 8B15[823C0100]      <1> 	mov	edx, [FAT_CurrentCluster] ; 01/03/2016
   909                              <1> 
   910 0000B77D A3[823C0100]        <1> 	mov 	[FAT_CurrentCluster], eax
   911 0000B782 8B0D[243F0100]      <1> 	mov	ecx, [ClusterValue]
   912 0000B788 890B                <1> 	mov	[ebx], ecx ; 29/02/2016 
   913                              <1> 
   914 0000B78A C605[863C0100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   915                              <1> 
   916                              <1> 	; 01/03/2016
   917 0000B791 21C0                <1> 	and	eax, eax ; was it free cluster ?
   918 0000B793 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 0000B795 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   924 0000B798 7520                <1> 	jne	short loc_upd_fat32_c3
   925                              <1> 
   926 0000B79A 3B15[923C0100]      <1> 	cmp	edx, [LastCluster]
   927 0000B7A0 7207                <1> 	jb	short loc_upd_fat32_c0
   928                              <1> 
   929 0000B7A2 BA02000000          <1> 	mov	edx, 2 ; rewind !
   930 0000B7A7 EB0E                <1> 	jmp	short loc_upd_fat32_c2
   931                              <1> 
   932                              <1> loc_upd_fat32_c0:
   933 0000B7A9 FF463E              <1> 	inc	dword [esi+LD_BPB+BPB_Reserved+4] ; set it to next cluster		
   934 0000B7AC EB0C                <1> 	jmp	short loc_upd_fat32_c3
   935                              <1> 
   936                              <1> loc_upd_fat32_c1:
   937 0000B7AE 09C9                <1> 	or	ecx, ecx ; will it be free cluster ?
   938 0000B7B0 7508                <1> 	jnz	short loc_upd_fat32_c3
   939                              <1> 
   940 0000B7B2 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   941 0000B7B5 7303                <1> 	jnb	short loc_upd_fat32_c3
   942                              <1> 
   943                              <1> loc_upd_fat32_c2:	
   944 0000B7B7 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx			
   945                              <1> 
   946                              <1> loc_upd_fat32_c3:
   947 0000B7BA 89C2                <1> 	mov	edx, eax
   948                              <1> 
   949                              <1> loc_upd_fat32_c4:
   950 0000B7BC 83F802              <1> 	cmp	eax, 2
   951 0000B7BF 0F8294FEFFFF        <1>         jb      return_uc_fat_stc
   952                              <1> 
   953                              <1> pass_uc_fat32_c_zero_check_2:
   954 0000B7C5 3B05[923C0100]      <1> 	cmp	eax, [LastCluster]
   955 0000B7CB 0F8788FEFFFF        <1>         ja      return_uc_fat_stc
   956                              <1> 	
   957 0000B7D1 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 0000B7D6 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   964 0000B7DB 8825[863C0100]      <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 0000B7E1 8B0D[243F0100]      <1> 	mov	ecx, [ClusterValue]
   970 0000B7E7 C3                  <1> 	retn
   971                              <1> 
   972                              <1> loc_uc_load_fat_sectors:
   973 0000B7E8 A3[8A3C0100]        <1> 	mov	[FAT_BuffSector], eax
   974                              <1> 
   975                              <1> load_uc_fat_sectors_zero:
   976 0000B7ED 034660              <1> 	add	eax, [esi+LD_FATBegin]
   977 0000B7F0 BB001C0900          <1> 	mov	ebx, FAT_Buffer
   978 0000B7F5 B903000000          <1> 	mov	ecx, 3
   979 0000B7FA E87A310000          <1> 	call	disk_read
   980 0000B7FF 72D5                <1> 	jc	short loc_fat_sectors_rw_error1
   981                              <1> 
   982 0000B801 C605[863C0100]01    <1>         mov     byte [FAT_BuffValidData], 1
   983 0000B808 A1[823C0100]        <1> 	mov 	eax, [FAT_CurrentCluster]
   984 0000B80D 8B0D[243F0100]      <1> 	mov	ecx, [ClusterValue]
   985 0000B813 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 0000B818 31D2                <1> 	xor	edx, edx
  1012 0000B81A 8A35[873C0100]      <1> 	mov	dh, [FAT_BuffDrvName]
  1013 0000B820 80FE41              <1> 	cmp	dh, 'A'
  1014 0000B823 722E                <1> 	jb	short loc_save_fat_buffer_inv_data_retn
  1015 0000B825 80EE41              <1> 	sub	dh, 'A'
  1016 0000B828 56                  <1> 	push	esi ; *
  1017 0000B829 BE00010900          <1>         mov     esi, Logical_DOSDisks
  1018 0000B82E 01D6                <1> 	add	esi, edx
  1019                              <1> 	
  1020 0000B830 8A5603              <1> 	mov	dl, [esi+LD_FATType]
  1021 0000B833 20D2                <1> 	and	dl, dl
  1022 0000B835 741B                <1> 	jz	short loc_save_fat_buffer_inv_data_pop_retn 
  1023                              <1> 
  1024 0000B837 A1[8A3C0100]        <1> 	mov	eax, [FAT_BuffSector]
  1025 0000B83C 80FA02              <1> 	cmp	dl, 2
  1026 0000B83F 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 0000B841 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+FATSecs] 
  1035 0000B845 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 0000B847 7609                <1> 	jna	short loc_save_fat_buffer_inv_data_pop_retn ; correct addr.
  1039 0000B849 EB15                <1> 	jmp	short loc_save_fat_buffer_check_rs3
  1040                              <1> 
  1041                              <1> loc_save_fat32_buff:
  1042 0000B84B 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+FAT32_FAT_Size]
  1043 0000B84E 29C1                <1> 	sub	ecx, eax
  1044 0000B850 770E                <1> 	ja	short loc_save_fat_buffer_check_rs3
  1045                              <1> 
  1046                              <1> loc_save_fat_buffer_inv_data_pop_retn:
  1047 0000B852 5E                  <1> 	pop	esi ; *
  1048                              <1> loc_save_fat_buffer_inv_data_retn:
  1049 0000B853 B80D000000          <1> 	mov	eax, 0Dh ; Invalid DATA
  1050 0000B858 C3                  <1> 	retn
  1051                              <1> 
  1052                              <1> loc_save_fat_buff_remain_sectors_3:
  1053 0000B859 B903000000          <1> 	mov	ecx, 3
  1054 0000B85E EB05                <1> 	jmp	short loc_save_fat_buff_continue
  1055                              <1> 
  1056                              <1> loc_save_fat_buffer_check_rs3:
  1057 0000B860 83F903              <1> 	cmp	ecx, 3
  1058 0000B863 77F4                <1> 	ja	short loc_save_fat_buff_remain_sectors_3
  1059                              <1> 
  1060                              <1> loc_save_fat_buff_continue:
  1061 0000B865 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1062 0000B86A 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1063 0000B86D 51                  <1> 	push	ecx
  1064 0000B86E E8F7300000          <1> 	call	disk_write
  1065 0000B873 59                  <1> 	pop	ecx
  1066 0000B874 722B                <1> 	jc	short loc_save_FAT_buff_write_err
  1067                              <1> 	
  1068 0000B876 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1069 0000B87A 7605                <1> 	jna	short loc_calc_2nd_fat12_16_addr
  1070                              <1> 
  1071                              <1> loc_calc_2nd_fat32_addr:
  1072 0000B87C 8B462A              <1> 	mov	eax, [esi+LD_BPB+FAT32_FAT_Size]
  1073 0000B87F EB04                <1> 	jmp	short loc_calc_2nd_fat_addr
  1074                              <1> 
  1075                              <1> loc_calc_2nd_fat12_16_addr:
  1076 0000B881 0FB7461C            <1> 	movzx	eax, word [esi+LD_BPB+FATSecs]
  1077                              <1> 
  1078                              <1> loc_calc_2nd_fat_addr:
  1079 0000B885 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1080 0000B888 0305[8A3C0100]      <1> 	add	eax, [FAT_BuffSector]
  1081 0000B88E BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1082                              <1> 	; ecx = 1 to 3
  1083 0000B893 E8D2300000          <1> 	call	disk_write
  1084 0000B898 7207                <1> 	jc	short loc_save_FAT_buff_write_err
  1085                              <1>  	; Valid  buffer (1 = valid but do not save)
  1086 0000B89A C605[863C0100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1087                              <1> 
  1088                              <1> loc_save_FAT_buff_write_err:
  1089 0000B8A1 5E                  <1> 	pop	esi ; *
  1090 0000B8A2 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1091                              <1> 	; 15/10/2016 (1Dh -> 18)
  1092                              <1> 	; 23/03/2016 (1Dh)
  1093 0000B8A7 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
  1094 0000B8AC 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 0000B8AD 66891D[2A3F0100]    <1> 	mov	[CFS_OPType], bx
  1122 0000B8B4 A3[2C3F0100]        <1> 	mov	[CFS_CC], eax
  1123                              <1> 	
  1124 0000B8B9 80FFFF              <1> 	cmp	bh, 0FFh
  1125 0000B8BC 740B                <1> 	je	short pass_calculate_freespace_get_drive_dt_offset
  1126                              <1> 
  1127                              <1> loc_calculate_freespace_get_drive_dt_offset:     
  1128 0000B8BE 31C0                <1> 	xor	eax, eax
  1129 0000B8C0 88FC                <1>         mov     ah, bh
  1130 0000B8C2 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1131 0000B8C7 01C6                <1>         add     esi, eax
  1132                              <1> 
  1133                              <1> pass_calculate_freespace_get_drive_dt_offset:
  1134 0000B8C9 08DB                <1> 	or	bl, bl
  1135 0000B8CB 7435                <1> 	jz	short loc_reset_fcc
  1136                              <1> 	
  1137                              <1> loc_get_free_sectors:
  1138 0000B8CD 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 0000B8D0 8B4E70              <1> 	mov	ecx, [esi+LD_TotalSectors]
  1147 0000B8D3 39C1                <1> 	cmp	ecx, eax ; Total sectors must be greater than Free sectors !
  1148 0000B8D5 7707                <1> 	ja	short loc_get_free_sectors_check_optype
  1149                              <1> 	
  1150 0000B8D7 31C0                <1> 	xor	eax, eax
  1151 0000B8D9 48                  <1> 	dec	eax ; 0FFFFFFFFh  ; recalculation is needed!
  1152 0000B8DA 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; reset (for recalculation)
  1153                              <1> 		
  1154                              <1> loc_get_free_sectors_retn:
  1155 0000B8DD C3                  <1> 	retn
  1156                              <1> 	
  1157                              <1> loc_get_free_sectors_check_optype:
  1158 0000B8DE 80FB03              <1> 	cmp	bl, 3
  1159 0000B8E1 7203                <1> 	jb	short loc_set_fcc
  1160                              <1> 
  1161 0000B8E3 29C9                <1> 	sub	ecx, ecx ; 0
  1162                              <1> 
  1163 0000B8E5 C3                  <1> 	retn	
  1164                              <1> 
  1165                              <1> loc_set_fcc:
  1166 0000B8E6 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1167 0000B8EA 0F87DF000000        <1>         ja      loc_update_FAT32_fs_info_fcc
  1168                              <1> 
  1169                              <1> 	;mov	eax, [esi+LD_FreeSectors]
  1170 0000B8F0 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  1171 0000B8F4 29D2                <1> 	sub	edx, edx
  1172 0000B8F6 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 0000B8F8 A3[A33C0100]        <1> 	mov	[FreeClusterCount], eax
  1180 0000B8FD E988000000          <1>         jmp     loc_set_free_sectors_FAT12_FAT16
  1181                              <1> 
  1182                              <1> loc_reset_fcc:
  1183 0000B902 31C0                <1> 	xor	eax, eax
  1184 0000B904 A3[A33C0100]        <1> 	mov	[FreeClusterCount], eax ; 0
  1185 0000B909 8B5678              <1> 	mov	edx, [esi+LD_Clusters]
  1186 0000B90C 42                  <1> 	inc	edx
  1187 0000B90D 8915[923C0100]      <1> 	mov	[LastCluster], edx
  1188                              <1> 
  1189 0000B913 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1190 0000B917 7647                <1> 	jna	short loc_count_free_fat_clusters_0  
  1191                              <1> 
  1192 0000B919 48                  <1> 	dec	eax ; FFFFFFFFh
  1193 0000B91A A3[343F0100]        <1> 	mov	[CFS_FAT32FC], eax
  1194                              <1> 
  1195                              <1> 	; 29/02/2016
  1196 0000B91F 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; reset
  1197 0000B922 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; reset
  1198                              <1> 	
  1199 0000B925 B802000000          <1> 	mov 	eax, 2
  1200                              <1> 
  1201                              <1> loc_count_fc_next_cluster_0:
  1202 0000B92A 50                  <1> 	push	eax
  1203 0000B92B E801F9FFFF          <1> 	call	get_next_cluster
  1204 0000B930 7310                <1> 	jnc	short loc_check_fat32_ff_cluster
  1205 0000B932 09C0                <1> 	or	eax, eax
  1206 0000B934 741E                <1> 	jz	short pass_inc_cfs_fcc_0
  1207                              <1> 
  1208                              <1> loc_put_fcc_unknown_sign:
  1209 0000B936 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 0000B937 8B15[343F0100]      <1> 	mov	edx, [CFS_FAT32FC] ; First Free Cluster
  1217                              <1> 	; Save First Free Cluster value in FAT32 'BPB_Reserved+4' area
  1218 0000B93D 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx
  1219                              <1> 	
  1220 0000B940 EB7D                <1>         jmp     loc_put_fcc_invalid_sign
  1221                              <1> 
  1222                              <1> loc_check_fat32_ff_cluster:
  1223 0000B942 09C0                <1> 	or	eax, eax
  1224 0000B944 750E                <1> 	jnz	short pass_inc_cfs_fcc_0
  1225 0000B946 58                  <1> 	pop	eax
  1226 0000B947 A3[343F0100]        <1> 	mov	[CFS_FAT32FC], eax
  1227                              <1> 	;mov	dword [FreeClusterCount], 1
  1228 0000B94C FF05[A33C0100]      <1> 	inc	dword [FreeClusterCount]
  1229 0000B952 EB27                <1> 	jmp	short pass_inc_cfs_fcc_1
  1230                              <1> 
  1231                              <1> pass_inc_cfs_fcc_0:
  1232 0000B954 58                  <1> 	pop	eax
  1233                              <1> 
  1234                              <1> pass_inc_cfs_fcc_0c:
  1235 0000B955 40                  <1> 	inc	eax ; add eax, 1
  1236 0000B956 3B05[923C0100]      <1> 	cmp	eax, [LastCluster]
  1237 0000B95C 76CC                <1> 	jna 	short loc_count_fc_next_cluster_0
  1238 0000B95E 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 0000B960 B002                <1> 	mov	al, 2
  1243                              <1> 
  1244                              <1> loc_count_fc_next_cluster:
  1245 0000B962 50                  <1> 	push	eax
  1246 0000B963 E8C9F8FFFF          <1> 	call	get_next_cluster
  1247 0000B968 720C                <1> 	jc	short loc_count_fcc_stc
  1248                              <1> 
  1249                              <1> loc_count_free_clusters_1:
  1250 0000B96A 21C0                <1> 	and	eax, eax
  1251 0000B96C 750C                <1> 	jnz	short pass_inc_cfs_fcc
  1252                              <1> 
  1253 0000B96E FF05[A33C0100]      <1> 	inc	dword [FreeClusterCount]
  1254 0000B974 EB04                <1> 	jmp	short pass_inc_cfs_fcc
  1255                              <1> 
  1256                              <1> loc_count_fcc_stc:
  1257 0000B976 09C0                <1> 	or	eax, eax
  1258 0000B978 75BC                <1> 	jnz	short loc_put_fcc_unknown_sign ; 29/02/2016
  1259                              <1> 
  1260                              <1> pass_inc_cfs_fcc:
  1261 0000B97A 58                  <1> 	pop	eax
  1262                              <1> 
  1263                              <1> pass_inc_cfs_fcc_1:
  1264 0000B97B 40                  <1> 	inc	eax ; add eax, 1
  1265 0000B97C 3B05[923C0100]      <1> 	cmp	eax, [LastCluster]
  1266 0000B982 76DE                <1> 	jna	short loc_count_fc_next_cluster
  1267                              <1> 
  1268                              <1> loc_set_free_sectors:
  1269 0000B984 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1270 0000B988 7745                <1> 	ja	short loc_update_FAT32_fs_info_fcc
  1271                              <1> 
  1272                              <1> loc_set_free_sectors_FAT12_FAT16:
  1273 0000B98A 803D[2A3F0100]00    <1> 	cmp	byte [CFS_OPType], 0
  1274 0000B991 761C                <1> 	jna	short pass_FAT_add_sub_fcc
  1275 0000B993 A1[2C3F0100]        <1> 	mov	eax, [CFS_CC]
  1276 0000B998 803D[2A3F0100]01    <1> 	cmp	byte [CFS_OPType], 1
  1277 0000B99F 7708                <1> 	ja	short pass_FAT_add_fcc
  1278 0000B9A1 0105[A33C0100]      <1> 	add 	[FreeClusterCount], eax
  1279 0000B9A7 EB06                <1> 	jmp	short pass_FAT_add_sub_fcc
  1280                              <1> 
  1281                              <1> pass_FAT_add_fcc:
  1282 0000B9A9 2905[A33C0100]      <1> 	sub	[FreeClusterCount], eax
  1283                              <1> 
  1284                              <1> pass_FAT_add_sub_fcc:
  1285 0000B9AF 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1286 0000B9B3 8B15[A33C0100]      <1> 	mov	edx, [FreeClusterCount]
  1287 0000B9B9 F7E2                <1> 	mul	edx
  1288                              <1> 
  1289 0000B9BB 31C9                <1> 	xor	ecx, ecx 
  1290 0000B9BD EB05                <1> 	jmp	short loc_cfs_retn_params
  1291                              <1> 
  1292                              <1> loc_put_fcc_invalid_sign:
  1293 0000B9BF 29C0                <1>        	sub	eax, eax ; 0
  1294 0000B9C1 48                  <1> 	dec	eax ; FFFFFFFFh
  1295                              <1> loc_fat32_ffc_recalc_needed:
  1296 0000B9C2 89C1                <1> 	mov	ecx, eax
  1297                              <1> 
  1298                              <1> loc_cfs_retn_params:
  1299 0000B9C4 894674              <1> 	mov 	[esi+LD_FreeSectors], eax
  1300 0000B9C7 0FB71D[2A3F0100]    <1> 	movzx	ebx, word [CFS_OPType]
  1301 0000B9CE 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 0000B9CF 803D[2A3F0100]01    <1> 	cmp	byte [CFS_OPType], 1
  1309 0000B9D6 7221                <1> 	jb	short loc_cfs_FAT32_get_rcalc_parms ; 0 = recalculated
  1310 0000B9D8 7406                <1> 	je	short loc_check_fcc_FSINFO_op1 ; 1 = add
  1311                              <1> loc_check_fcc_FSINFO_op2: ; subtract
  1312 0000B9DA F71D[2C3F0100]      <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 0000B9E0 31D2                <1> 	xor	edx, edx ; 0
  1316 0000B9E2 4A                  <1> 	dec	edx ; 0FFFFFFFFh
  1317 0000B9E3 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved]
  1318 0000B9E6 39D0                <1> 	cmp	eax, edx
  1319 0000B9E8 73D5                <1> 	jnb	short loc_put_fcc_invalid_sign
  1320 0000B9EA 0305[2C3F0100]      <1>         add     eax, [CFS_CC] ; free cluster count on disk + current count
  1321 0000B9F0 72CD                <1> 	jc	short loc_put_fcc_invalid_sign
  1322                              <1> 	
  1323 0000B9F2 A3[A33C0100]        <1> 	mov	[FreeClusterCount], eax
  1324 0000B9F7 EB0E                <1> 	jmp	short loc_cfs_write_FSINFO_sector
  1325                              <1> 
  1326                              <1> loc_cfs_FAT32_get_rcalc_parms:
  1327 0000B9F9 8B15[343F0100]      <1> 	mov	edx, [CFS_FAT32FC]
  1328 0000B9FF A1[A33C0100]        <1> 	mov	eax, [FreeClusterCount]
  1329 0000BA04 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx ; First Free Cluster
  1330                              <1> loc_cfs_write_FSINFO_sector:
  1331 0000BA07 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
  1332                              <1> 	; 01/03/2016
  1333 0000BA0A E8AA000000          <1> 	call	set_fat32_fsinfo_sector_parms
  1334 0000BA0F 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 0000BA11 8B0D[A33C0100]      <1> 	mov	ecx, [FreeClusterCount]
  1344 0000BA17 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1345 0000BA1B F7E1                <1> 	mul	ecx
  1346                              <1> 	; 29/02/2016
  1347 0000BA1D 31C9                <1> 	xor	ecx, ecx ; 0
  1348 0000BA1F 09D2                <1> 	or	edx, edx ; 0 ?
  1349 0000BA21 759C                <1>         jnz     loc_put_fcc_invalid_sign
  1350 0000BA23 394670              <1> 	cmp	[esi+LD_TotalSectors], eax ; Volume size in sectors
  1351 0000BA26 7697                <1>         jna     short loc_put_fcc_invalid_sign
  1352                              <1> 	;
  1353                              <1> loc_set_FAT32_free_sectors_ok:
  1354 0000BA28 31D2                <1> 	xor	edx, edx ; 0
  1355 0000BA2A 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 0000BA2C 89C1                <1> 	mov	ecx, eax
  1377                              <1> 
  1378 0000BA2E C705[3C3F0100]FFFF- <1> 	mov	dword [glc_index], 0FFFFFFFFh ; 22/10/2016	
  1378 0000BA36 FFFF                <1>
  1379                              <1> 
  1380                              <1> loc_glc_get_next_cluster_1:
  1381 0000BA38 890D[383F0100]      <1> 	mov	[glc_prevcluster], ecx
  1382                              <1>  	; 22/10/2016
  1383 0000BA3E FF05[3C3F0100]      <1> 	inc	dword [glc_index]
  1384                              <1> 
  1385                              <1> loc_glc_get_next_cluster_2:
  1386 0000BA44 E8E8F7FFFF          <1> 	call	get_next_cluster
  1387                              <1> 	; ecx = current/previous cluster 
  1388                              <1> 	; eax = next/last cluster
  1389 0000BA49 73ED                <1> 	jnc	short loc_glc_get_next_cluster_1
  1390                              <1> 
  1391 0000BA4B 09C0                <1> 	or	eax, eax
  1392 0000BA4D 7509                <1> 	jnz	short loc_glc_stc_retn
  1393                              <1> 
  1394                              <1> 	; ecx = previous cluster
  1395 0000BA4F 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 0000BA51 8B0D[383F0100]      <1> 	mov	ecx, [glc_prevcluster] 
  1402 0000BA57 C3                  <1> 	retn
  1403                              <1> 
  1404                              <1> loc_glc_stc_retn:
  1405 0000BA58 F5                  <1> 	cmc	;stc
  1406 0000BA59 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 0000BA5B 31C9                <1> 	xor	ecx, ecx ; mov ecx, 0
  1426                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1427 0000BA5D 890D[8E3C0100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1428                              <1> 
  1429                              <1> loc_tcc_unlink_clusters:
  1430 0000BA63 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 0000BA68 73F9                <1> 	jnc short loc_tcc_unlink_clusters
  1437                              <1> 
  1438                              <1> pass_tcc_unlink_clusters:
  1439 0000BA6A A2[433F0100]        <1> 	mov	byte [TCC_FATErr], al
  1440 0000BA6F 803D[863C0100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  1441 0000BA76 750E                <1> 	jne	short loc_tcc_calculate_FAT_freespace
  1442 0000BA78 E89BFDFFFF          <1> 	call	save_fat_buffer
  1443 0000BA7D 7307                <1> 	jnc	short loc_tcc_calculate_FAT_freespace
  1444 0000BA7F A2[433F0100]        <1> 	mov	byte [TCC_FATErr], al ; Error
  1445                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1446                              <1> 
  1447                              <1> 	; 01/03/2016
  1448 0000BA84 EB12                <1> 	jmp	short loc_tcc_recalculate_FAT_freespace
  1449                              <1> 
  1450                              <1> loc_tcc_calculate_FAT_freespace:
  1451 0000BA86 A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter] ; signed (+-) number
  1452 0000BA8B 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI = Dos drv desc. table
  1453                              <1> 			   ; BL = 1 -> add cluster
  1454 0000BA8F E819FEFFFF          <1> 	call	calculate_fat_freespace
  1455 0000BA94 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  1456 0000BA96 7409                <1> 	jz	short pass_truncate_cc_recalc_FAT_freespace
  1457                              <1> 
  1458                              <1> loc_tcc_recalculate_FAT_freespace:
  1459 0000BA98 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate !
  1460 0000BA9C 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 0000BAA1 8B0D[8E3C0100]      <1> 	mov	ecx, [FAT_ClusterCounter]
  1465                              <1> 
  1466 0000BAA7 803D[433F0100]00    <1> 	cmp	byte [TCC_FATErr], 0
  1467 0000BAAE 7608                <1> 	jna	short loc_tcc_unlink_clusters_retn
  1468                              <1> 
  1469                              <1> loc_tcc_unlink_clusters_error:
  1470 0000BAB0 0FB605[433F0100]    <1> 	movzx	eax, byte [TCC_FATErr]
  1471 0000BAB7 F9                  <1> 	stc
  1472                              <1> loc_tcc_unlink_clusters_retn:
  1473 0000BAB8 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 0000BAB9 E824000000          <1> 	call	get_fat32_fsinfo_sector_parms
  1491 0000BABE 7221                <1> 	jc	short update_fat32_fsinfo_sector_retn
  1492                              <1> 
  1493 0000BAC0 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved] ; Free Cluster Count
  1494 0000BAC3 8B563E              <1> 	mov	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free Cluster	
  1495                              <1> 
  1496                              <1>         ;mov	ebx, DOSBootSectorBuff
  1497 0000BAC6 8983E8010000        <1> 	mov	[ebx+488], eax
  1498 0000BACC 8993EC010000        <1> 	mov	[ebx+492], edx	
  1499                              <1> 
  1500 0000BAD2 A1[303F0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1501 0000BAD7 B901000000          <1> 	mov	ecx, 1
  1502 0000BADC E8892E0000          <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 0000BAE1 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 0000BAE2 0FB74636            <1> 	movzx	eax, word [esi+LD_BPB+FAT32_FSInfoSec]
  1534 0000BAE6 03466C              <1> 	add	eax, [esi+LD_StartSector]
  1535 0000BAE9 A3[303F0100]        <1> 	mov	[CFS_FAT32FSINFOSEC], eax
  1536                              <1> 	
  1537 0000BAEE BB[823A0100]        <1>         mov     ebx, DOSBootSectorBuff
  1538 0000BAF3 B901000000          <1> 	mov	ecx, 1
  1539 0000BAF8 E87C2E0000          <1> 	call	disk_read
  1540 0000BAFD 7232                <1> 	jc	short loc_read_FAT32_fsinfo_sec_err
  1541                              <1> 
  1542 0000BAFF BB[823A0100]        <1> 	mov	ebx, DOSBootSectorBuff
  1543                              <1> 
  1544 0000BB04 813B52526141        <1> 	cmp	dword [ebx], 41615252h
  1545 0000BB0A 751E                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1546                              <1> 
  1547 0000BB0C 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
  1547 0000BB15 61                  <1>
  1548 0000BB16 7512                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1549                              <1> 
  1550 0000BB18 A1[303F0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1551 0000BB1D 8B8BE8010000        <1> 	mov	ecx, [ebx+488] ; free cluster count
  1552 0000BB23 8B93EC010000        <1> 	mov	edx, [ebx+492] ; first (next) free cluster	
  1553                              <1> 
  1554 0000BB29 C3                  <1> 	retn
  1555                              <1> 
  1556                              <1> loc_read_FAT32_fsinfo_sec_stc: 
  1557                              <1> 	; 15/10/2016 (0Bh -> 28)
  1558 0000BB2A B81C000000          <1> 	mov	eax, 28 ; Invalid format!
  1559 0000BB2F 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 0000BB31 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
  1565                              <1> 
  1566                              <1> loc_read_FAT32_fsinfo_sec_stc_retn:
  1567 0000BB36 29DB                <1> 	sub	ebx, ebx ; 0
  1568 0000BB38 F9                  <1> 	stc
  1569 0000BB39 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 0000BB3A A3[60400100]        <1> 	mov	[FAT_anc_LCluster], eax
  1594                              <1> 	
  1595 0000BB3F E844F9FFFF          <1> 	call	get_first_free_cluster
  1596 0000BB44 720B                <1> 	jc	short loc_add_new_cluster_retn
  1597                              <1> 	; EAX >= 2 and EAX < FFFFFFFFh is valid
  1598                              <1> 
  1599 0000BB46 89C2                <1> 	mov	edx, eax
  1600                              <1> 
  1601 0000BB48 42                  <1> 	inc	edx
  1602                              <1> 	;jnz	short loc_add_new_cluster_check_ffc_eax
  1603 0000BB49 7516                <1> 	jnz	short loc_add_new_cluster_save_fcc
  1604                              <1> 
  1605                              <1> loc_add_new_cluster_no_disk_space_retn:
  1606 0000BB4B B827000000          <1> 	mov	eax, 27h ; MSDOS err => insufficient disk space
  1607                              <1> loc_add_new_cluster_stc_retn:
  1608 0000BB50 F9                  <1> 	stc
  1609                              <1> loc_add_new_cluster_retn:
  1610 0000BB51 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1611 0000BB55 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1612                              <1> 	;xor	edx, edx
  1613                              <1> 	;stc
  1614 0000BB58 C3                  <1> 	retn
  1615                              <1> 
  1616                              <1> loc_anc_invalid_format_stc_retn:
  1617 0000BB59 F9                  <1> 	stc
  1618                              <1> loc_add_new_cluster_invalid_format_retn:
  1619                              <1> 	; 15/10/2016 (0Bh -> 28)
  1620 0000BB5A B81C000000          <1> 	mov	eax, 28 ; Invalid format
  1621 0000BB5F 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 0000BB61 A3[64400100]        <1> 	mov	[FAT_anc_FFCluster], eax
  1629                              <1> 
  1630 0000BB66 83E802              <1> 	sub	eax, 2
  1631 0000BB69 0FB65E13            <1>         movzx   ebx, byte [esi+LD_BPB+SecPerClust]
  1632 0000BB6D F7E3                <1> 	mul	ebx
  1633 0000BB6F 09D2                <1> 	or	edx, edx
  1634 0000BB71 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 0000BB73 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 0000BB74 BF00000700          <1> 	mov	edi, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  1651 0000BB79 89D9                <1> 	mov	ecx, ebx ; sector count
  1652 0000BB7B C1E107              <1> 	shl	ecx, 7 ; 1 sector = 512 bytes -> 128 double words
  1653                              <1> 	;xor	eax, eax ; 0
  1654 0000BB7E 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 0000BB80 89D0                <1> 	mov	eax, edx
  1660 0000BB82 034668              <1>         add     eax, [esi+LD_DATABegin]
  1661 0000BB85 72D3                <1> 	jc	short loc_add_new_cluster_invalid_format_retn 
  1662                              <1> 		
  1663 0000BB87 89D9                <1> 	mov	ecx, ebx ; ECX = sectors per cluster (<256)
  1664 0000BB89 BB00000700          <1> 	mov	ebx, Cluster_Buffer
  1665 0000BB8E E8D72D0000          <1> 	call	disk_write
  1666 0000BB93 7307                <1> 	jnc	short loc_add_new_cluster_update_fat_nlc
  1667                              <1> 	
  1668                              <1> 	; 15/10/2016 (1Dh -> 18)
  1669 0000BB95 B812000000          <1> 	mov	eax, 18 ; Write Error
  1670 0000BB9A EBB4                <1> 	jmp	short loc_add_new_cluster_stc_retn
  1671                              <1> 
  1672                              <1> loc_add_new_cluster_update_fat_nlc:
  1673 0000BB9C A1[64400100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1674 0000BBA1 31C9                <1> 	xor	ecx, ecx
  1675 0000BBA3 890D[8E3C0100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1676 0000BBA9 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1677 0000BBAA E8ACF9FFFF          <1> 	call	update_cluster
  1678 0000BBAF 7304                <1> 	jnc	short loc_add_new_cluster_update_fat_plc
  1679 0000BBB1 09C0                <1> 	or	eax, eax ;EAX = 0 -> cluster value is 0 or eocc
  1680 0000BBB3 759B                <1> 	jnz	short loc_add_new_cluster_stc_retn
  1681                              <1> 
  1682                              <1> loc_add_new_cluster_update_fat_plc:
  1683 0000BBB5 A1[60400100]        <1> 	mov	eax, [FAT_anc_LCluster]
  1684 0000BBBA 8B0D[64400100]      <1> 	mov	ecx, [FAT_anc_FFCluster]
  1685 0000BBC0 E896F9FFFF          <1> 	call	update_cluster
  1686 0000BBC5 7314                <1> 	jnc	short loc_add_new_cluster_save_fat_buffer
  1687 0000BBC7 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1688 0000BBC9 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 0000BBCB 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1695                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1696 0000BBCF 50                  <1> 	push	eax
  1697 0000BBD0 E8D8FCFFFF          <1> 	call	calculate_fat_freespace
  1698 0000BBD5 58                  <1> 	pop	eax
  1699 0000BBD6 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 0000BBDB E838FCFFFF          <1> 	call	save_fat_buffer
  1706 0000BBE0 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 0000BBE2 A1[8E3C0100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1711 0000BBE7 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI -> Dos drv desc. table
  1712                              <1> 		; BL = 1 -> add cluster
  1713 0000BBEB 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 0000BBED E8BBFCFFFF          <1>         call    calculate_fat_freespace
  1717                              <1> 	;ECX = 0 -> no error, ECX > 0 -> error or invalid return
  1718 0000BBF2 21C9                <1> 	and	ecx, ecx ; ECX = 0 -> valid free sector count
  1719 0000BBF4 7409                <1> 	jz	short loc_add_new_cluster_return_cluster_number
  1720                              <1> 
  1721                              <1> loc_add_new_cluster_recalc_FAT_freespace:
  1722 0000BBF6 66BB00FF            <1> 	mov	bx, 0FF00h  ; recalculate free space
  1723 0000BBFA E8AEFCFFFF          <1>         call    calculate_fat_freespace
  1724                              <1> 	; cf = 0
  1725                              <1> loc_add_new_cluster_return_cluster_number:
  1726 0000BBFF 89C1                <1> 	mov	ecx, eax ; Free sector count
  1727 0000BC01 A1[64400100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1728 0000BC06 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1729                              <1> 	;mov	edi, Cluster_Buffer
  1730 0000BC0A 31D2                <1> 	xor	edx, edx
  1731 0000BC0C 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 0000BC0D 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 0000BC11 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  1755 0000BC15 761C                <1> 	jna	short write_fs_cluster
  1756                              <1> 
  1757                              <1> write_fat_file_sectors: 
  1758 0000BC17 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
  1759 0000BC1A 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
  1760 0000BC1E F7E2                <1> 	mul	edx
  1761 0000BC20 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 0000BC23 E8422D0000          <1> 	call	disk_write
  1770 0000BC28 7306                <1> 	jnc	short wclust_retn
  1771                              <1> 	
  1772                              <1> 	; 15/10/2016 (1Dh -> 18)
  1773 0000BC2A B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  1774 0000BC2F C3                  <1> 	retn
  1775                              <1> 
  1776                              <1> wclust_retn:
  1777 0000BC30 29C0                <1> 	sub	eax, eax ; 0
  1778 0000BC32 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 0000BC33 B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
  1793 0000BC38 E801000000          <1> 	call	write_fs_sectors
  1794 0000BC3D C3                  <1> 	retn
  1795                              <1> 
  1796                              <1> write_fs_sectors:
  1797                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1798 0000BC3E F9                  <1> 	stc
  1799 0000BC3F 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 0000BC40 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1816 0000BC44 721E                <1>         jb      short get_fs_section_by_index 
  1817                              <1> 
  1818 0000BC46 3B4E78              <1> 	cmp	ecx, [esi+LD_Clusters]
  1819 0000BC49 7207                <1> 	jb	short gcbi_1
  1820                              <1> gcbi_0:
  1821 0000BC4B F9                  <1> 	stc
  1822 0000BC4C B823000000          <1> 	mov	eax, 23h ; Cluster not available ! 
  1823                              <1> 			 ; MSDOS error code: FCB unavailable
  1824 0000BC51 C3                  <1> 	retn
  1825                              <1> gcbi_1:
  1826 0000BC52 51                  <1> 	push	ecx
  1827 0000BC53 E8D9F5FFFF          <1> 	call	get_next_cluster
  1828 0000BC58 59                  <1> 	pop	ecx
  1829 0000BC59 7203                <1> 	jc	short gcbi_3
  1830 0000BC5B E2F5                <1> 	loop	gcbi_1
  1831                              <1> gcbi_2:
  1832 0000BC5D C3                  <1> 	retn
  1833                              <1> gcbi_3:
  1834 0000BC5E 09C0                <1> 	or	eax, eax
  1835 0000BC60 74E9                <1> 	jz	short gcbi_0
  1836 0000BC62 F5                  <1> 	cmc 	; stc
  1837 0000BC63 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 0000BC64 B8FFFFFFFF          <1> 	mov	eax, 0FFFFFFFFh
  1854 0000BC69 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 0000BC6A B800000000          <1> 	mov	eax, 0
  1872 0000BC6F BA00000000          <1> 	mov	edx, 0
  1873 0000BC74 C3                  <1> 	retn
  2159                                  %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: 20/02/2017
     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> ; 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> 	; 13/01/2017
    20                              <1> 	; 06/06/2016
    21                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
    22                              <1> 	; 16/04/2015 - 19/10/2015 (Retro UNIX 386 v1)
    23                              <1> 	; 10/04/2013 - 18/01/2014 (Retro UNIX 8086 v1)
    24                              <1> 	;
    25                              <1> 	; 'unkni' or 'sysent' is sytem entry from various traps. 
    26                              <1> 	; The trap type is determined and an indirect jump is made to 
    27                              <1> 	; the appropriate system call handler. If there is a trap inside
    28                              <1> 	; the system a jump to panic is made. All user registers are saved 
    29                              <1> 	; and u.sp points to the end of the users stack. The sys (trap)
    30                              <1> 	; instructor is decoded to get the the system code part (see
    31                              <1> 	; trap instruction in the PDP-11 handbook) and from this 
    32                              <1> 	; the indirect jump address is calculated. If a bad system call is
    33                              <1> 	; made, i.e., the limits of the jump table are exceeded, 'badsys'
    34                              <1> 	; is called. If the call is legitimate control passes to the
    35                              <1> 	; appropriate system routine.
    36                              <1> 	;
    37                              <1> 	; Calling sequence:
    38                              <1> 	;	Through a trap caused by any sys call outside the system.
    39                              <1> 	; Arguments:
    40                              <1> 	;	Arguments of particular system call.	
    41                              <1> 	; ...............................................................
    42                              <1> 	;	
    43                              <1> 	; Retro UNIX 8086 v1 modification: 
    44                              <1> 	;       System call number is in EAX register.
    45                              <1> 	;
    46                              <1> 	;       Other parameters are in EDX, EBX, ECX, ESI, EDI, EBP
    47                              <1> 	;	registers depending of function details.
    48                              <1>   	;
    49                              <1> 	; 16/04/2015
    50 0000BC75 368925[DC490100]    <1>         mov     [ss:u.sp], esp ; Kernel stack points to return address
    51                              <1> 
    52                              <1> 	; save user registers
    53 0000BC7C 1E                  <1> 	push	ds
    54 0000BC7D 06                  <1> 	push	es
    55 0000BC7E 0FA0                <1> 	push	fs
    56 0000BC80 0FA8                <1> 	push	gs
    57 0000BC82 60                  <1> 	pushad  ; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
    58                              <1> 	;
    59                              <1> 	; ESPACE = [ss:u.sp] - esp ; 4*12 = 48 ; 17/09/2015 ; 06/06/2016
    60                              <1> 	; 	(ESPACE is size of space in kernel stack 
    61                              <1> 	;	for saving/restoring user registers.)
    62                              <1> 	;
    63 0000BC83 50                  <1> 	push	eax ; 01/07/2015
    64 0000BC84 66B81000            <1> 	mov     ax, KDATA
    65 0000BC88 8ED8                <1>         mov     ds, ax
    66 0000BC8A 8EC0                <1>         mov     es, ax
    67 0000BC8C 8EE0                <1>         mov     fs, ax
    68 0000BC8E 8EE8                <1>         mov     gs, ax
    69 0000BC90 A1[A8330100]        <1> 	mov	eax, [k_page_dir]
    70 0000BC95 0F22D8              <1> 	mov	cr3, eax
    71 0000BC98 58                  <1> 	pop	eax ; 01/07/2015
    72                              <1> 	; 19/10/2015
    73 0000BC99 FC                  <1> 	cld
    74                              <1> 	;
    75 0000BC9A FE05[DB490100]      <1> 	inc	byte [sysflg]
    76                              <1> 		; incb sysflg / indicate a system routine is in progress
    77 0000BCA0 FB                  <1>         sti 	; 18/01/2014
    78 0000BCA1 0F851EA0FFFF        <1> 	jnz     panic ; 24/05/2013
    79                              <1> 		; beq 1f
    80                              <1> 		; jmp panic ; / called if trap inside system
    81                              <1> ;1:
    82                              <1> 	; 16/04/2015
    83 0000BCA7 A3[E4490100]        <1> 	mov	[u.r0], eax
    84 0000BCAC 8925[E0490100]      <1> 	mov	[u.usp], esp ; kernel stack points to user's registers
    85                              <1> 
    86                              <1> 	; 13/01/2017 (TRDOS 386 Feaure only !)
    87 0000BCB2 803D[544A0100]00    <1> 	cmp	byte [u.t_lock], 0 ; timer interrupt lock ?
    88 0000BCB9 0F8749010000        <1> 	ja	sysrele		   ; yes, sys release only !!!
    89                              <1> 
    90                              <1> 		; mov $s.syst+2,clockp
    91                              <1> 		; mov r0,-(sp) / save user registers 
    92                              <1> 		; mov sp,u.r0 / pointer to bottom of users stack 
    93                              <1> 			   ; / in u.r0
    94                              <1> 		; mov r1,-(sp)
    95                              <1> 		; mov r2,-(sp)
    96                              <1> 		; mov r3,-(sp)
    97                              <1> 		; mov r4,-(sp)
    98                              <1> 		; mov r5,-(sp)
    99                              <1> 		; mov ac,-(sp) / "accumulator" register for extended
   100                              <1> 		             ; / arithmetic unit
   101                              <1> 		; mov mq,-(sp) / "multiplier quotient" register for the
   102                              <1> 		             ; / extended arithmetic unit
   103                              <1> 		; mov sc,-(sp) / "step count" register for the extended
   104                              <1> 		             ; / arithmetic unit
   105                              <1> 		; mov sp,u.sp / u.sp points to top of users stack
   106                              <1> 		; mov 18.(sp),r0 / store pc in r0
   107                              <1> 		; mov -(r0),r0 / sys inst in r0      10400xxx
   108                              <1> 		; sub $sys,r0 / get xxx code
   109 0000BCBF C1E002              <1> 	shl	eax, 2
   110                              <1> 		; asl r0 / multiply by 2 to jump indirect in bytes
   111 0000BCC2 3DB0000000          <1> 	cmp	eax, end_of_syscalls - syscalls
   112                              <1> 		; cmp r0,$2f-1f / limit of table (35) exceeded
   113                              <1> 	;jnb	short badsys
   114                              <1> 		; bhis badsys / yes, bad system call
   115 0000BCC7 F5                  <1> 	cmc
   116 0000BCC8 9C                  <1> 	pushf	
   117 0000BCC9 50                  <1> 	push	eax
   118 0000BCCA 8B2D[DC490100]      <1>  	mov 	ebp, [u.sp] ; Kernel stack at the beginning of sys call
   119 0000BCD0 B0FE                <1> 	mov	al, 0FEh ; 11111110b
   120 0000BCD2 1400                <1> 	adc	al, 0 ; al = al + cf
   121 0000BCD4 204508              <1> 	and	[ebp+8], al ; flags (reset carry flag)
   122                              <1> 		; bic $341,20.(sp) / set users processor priority to 0 
   123                              <1> 				 ; / and clear carry bit
   124 0000BCD7 5D                  <1> 	pop	ebp ; eax
   125 0000BCD8 9D                  <1> 	popf
   126 0000BCD9 0F8278010000        <1>         jc      badsys
   127 0000BCDF A1[E4490100]        <1> 	mov	eax, [u.r0]
   128                              <1> 	; system call registers: EAX, EDX, ECX, EBX, ESI, EDI
   129 0000BCE4 FFA5[EABC0000]      <1> 	jmp	dword [ebp+syscalls]
   130                              <1> 		; jmp *1f(r0) / jump indirect thru table of addresses
   131                              <1> 		            ; / to proper system routine.
   132                              <1> syscalls: ; 1:
   133                              <1> 	; 19/02/2017
   134                              <1> 	; 15/10/2016
   135                              <1> 	; 20/05/2016
   136                              <1> 	; 19/05/2016
   137                              <1> 	; 16/05/2016
   138                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   139                              <1> 	; 21/09/2015
   140                              <1> 	; 01/07/2015
   141                              <1> 	; 16/04/2015 (32 bit address modification) 
   142                              <1> 	;dd sysrele	; / 0
   143 0000BCEA [D5DF0000]          <1> 	dd sysver	; 0 ; Get TRDOS 386 version number (v2.0)	
   144 0000BCEE [B9BE0000]          <1> 	dd sysexit 	; / 1
   145 0000BCF2 [3AC00000]          <1> 	dd sysfork 	; / 2
   146 0000BCF6 [6EC40000]          <1> 	dd sysread 	; / 3
   147 0000BCFA [8DC40000]          <1> 	dd syswrite 	; / 4
   148 0000BCFE [24C20000]          <1> 	dd sysopen 	; / 5
   149 0000BD02 [45C40000]          <1> 	dd sysclose 	; / 6
   150 0000BD06 [BCBF0000]          <1> 	dd syswait 	; / 7
   151 0000BD0A [52C10000]          <1> 	dd syscreat 	; / 8
   152 0000BD0E [4AD00000]          <1> 	dd syslink 	; / 9
   153 0000BD12 [95D00000]          <1> 	dd sysunlink 	; / 10
   154 0000BD16 [22D10000]          <1> 	dd sysexec 	; / 11
   155 0000BD1A [19D50000]          <1> 	dd syschdir 	; / 12
   156 0000BD1E [F8D50000]          <1> 	dd systime 	; / 13
   157 0000BD22 [07C40000]          <1> 	dd sysmkdir 	; / 14
   158 0000BD26 [6BD50000]          <1> 	dd syschmod 	; / 15
   159 0000BD2A [C8D50000]          <1> 	dd syschown 	; / 16
   160 0000BD2E [2BD60000]          <1> 	dd sysbreak 	; / 17
   161 0000BD32 [C9D20000]          <1> 	dd sysstat 	; / 18
   162 0000BD36 [70D60000]          <1> 	dd sysseek 	; / 19
   163 0000BD3A [82D60000]          <1> 	dd systell 	; / 20
   164 0000BD3E [6BD70000]          <1> 	dd sysmount 	; / 21
   165 0000BD42 [7FD70000]          <1> 	dd sysumount 	; / 22
   166 0000BD46 [F4D60000]          <1> 	dd syssetuid 	; / 23
   167 0000BD4A [25D70000]          <1> 	dd sysgetuid 	; / 24
   168 0000BD4E [07D60000]          <1> 	dd sysstime 	; / 25
   169 0000BD52 [E8D60000]          <1> 	dd sysquit 	; / 26
   170 0000BD56 [DCD60000]          <1> 	dd sysintr 	; / 27
   171 0000BD5A [DDD20000]          <1> 	dd sysfstat 	; / 28
   172 0000BD5E [24C50000]          <1> 	dd sysemt 	; / 29
   173 0000BD62 [D5C60000]          <1> 	dd sysmdate 	; / 30
   174                              <1> 	;dd sysstty	; / 31
   175 0000BD66 [E9C60000]          <1> 	dd sysvideo 	; 31 ; TRDOS 386 Video Functions (16/05/2016)
   176                              <1> 	;dd sysgtty	; / 32
   177 0000BD6A [38D00000]          <1> 	dd sysaudio 	; 32 ; TRDOS 386 Audio Functions (16/05/2016)
   178                              <1> 	;dd sysilgins	; / 33
   179 0000BD6E [3DC50000]          <1> 	dd systimer 	; 33 ; TRDOS 386 Timer Functions (18/05/2016)
   180 0000BD72 [93D70000]          <1> 	dd syssleep 	; 34 ; Retro UNIX 8086 v1 feature only !
   181                              <1> 			     ; 11/06/2014
   182 0000BD76 [C2D70000]          <1> 	dd sysmsg	; 35 ; Retro UNIX 386 v1 feature only !
   183                              <1> 			     ; 01/07/2015
   184 0000BD7A [98D80000]          <1> 	dd sysgeterr	; 36 ; Retro UNIX 386 v1 feature only !
   185                              <1> 			     ; 21/09/2015 - get last error number
   186 0000BD7E [E4DF0000]          <1> 	dd sysreserved1 ; 37 ;; TRDOS 386 (19/05/2016)
   187 0000BD82 [F3DF0000]          <1> 	dd syspri 	; 38 ; change priority - TRDOS 386 (20/05/2016)
   188 0000BD86 [08BE0000]          <1> 	dd sysrele	; 39 ; TRDOS 386 (19/05/2016) (0 -> 39)
   189 0000BD8A [26E10000]          <1> 	dd sysfff	; 40 ; Find First File - TRDOS 386 (15/10/2016)
   190 0000BD8E [05E20000]          <1> 	dd sysfnf	; 41 ; Find Next File - TRDOS 386 (15/10/2016)
   191 0000BD92 [75E80000]          <1> 	dd sysalloc	; 42 ; Allocate contiguous memory block/pages
   192                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions		
   193 0000BD96 [25E90000]          <1> 	dd sysdalloc	; 43 ; Deallocate contiguous memory block/pages
   194                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions
   195                              <1> 	;dd syscalbac	; 44 ; IRQ Callback and Signal Response Byte
   196                              <1> 			     ; service setup - TRDOS 386 (20/02/2017)
   197                              <1> 			     ; Not ready yet !!!		 	
   198                              <1> 
   199                              <1> end_of_syscalls:
   200                              <1> 
   201                              <1> error:
   202                              <1> 	; 18/05/2016
   203                              <1> 	; 13/05/2016
   204                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   205                              <1> 	; 16/04/2015 - 17/09/2015 (Retro UNIX 386 v1)
   206                              <1> 	; 10/04/2013 - 07/08/2013 (Retro UNIX 8086 v1)
   207                              <1> 	;
   208                              <1> 	; 'error' merely sets the error bit off the processor status (c-bit)
   209                              <1> 	; then falls right into the 'sysret', 'sysrele' return sequence.
   210                              <1> 	;
   211                              <1> 	; INPUTS -> none
   212                              <1> 	; OUTPUTS ->
   213                              <1> 	;	processor status - carry (c) bit is set (means error)
   214                              <1> 	;
   215                              <1> 	; 26/05/2013 (Stack pointer must be reset here! 
   216                              <1> 	; 	      Because, jumps to error procedure
   217                              <1> 	;	      disrupts push-pop nesting balance)
   218                              <1> 	;
   219 0000BD9A 8B2D[DC490100]      <1> 	mov	ebp, [u.sp] ; interrupt (system call) return (iretd) address
   220 0000BDA0 804D0801            <1> 	or	byte [ebp+8], 1  ; set carry bit of flags register
   221                              <1> 				 ; (system call will return with cf = 1)
   222                              <1> 		; bis $1,20.(r1) / set c bit in processor status word below
   223                              <1> 		               ; / users stack
   224                              <1> 	; 17/09/2015
   225 0000BDA4 83ED30              <1> 	sub	ebp, ESPACE ; 48 ; total size of stack frame ('sysdefs.inc')
   226                              <1> 				 ; for saving/restoring user registers	
   227                              <1> 	;cmp	ebp, [u.usp]
   228                              <1> 	;je	short err0	
   229 0000BDA7 892D[E0490100]      <1> 	mov	[u.usp], ebp
   230                              <1> ;err0:
   231                              <1> 	; 01/09/2015
   232 0000BDAD 8B25[E0490100]      <1> 	mov	esp, [u.usp] 	    ; Retro Unix 8086 v1 modification!
   233                              <1> 				    ; 10/04/2013
   234                              <1> 				    ; (If an I/O error occurs during disk I/O,
   235                              <1> 				    ; related procedures will jump to 'error'
   236                              <1> 				    ; procedure directly without returning to 
   237                              <1> 				    ; the caller procedure. So, stack pointer
   238                              <1>                                     ; must be restored here.)
   239                              <1> 	; 13/05/2016
   240                              <1> 	; NOTE: (The last) error code is in 'u.error', it can be retrieved by
   241                              <1> 	;	'get last error' system call later. 	
   242                              <1> 
   243                              <1> 	; 03/09/2015 - 09/06/2015 - 07/08/2013
   244 0000BDB3 C605[464A0100]00    <1> 	mov 	byte [u.kcall], 0 ; namei_r, mkdir_w reset
   245                              <1> 
   246                              <1> sysret: ; < return from system call>
   247                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   248                              <1> 	; 16/04/2015 - 10/09/2015 (Retro UNIX 386 v1)
   249                              <1> 	; 10/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
   250                              <1> 	;
   251                              <1> 	; 'sysret' first checks to see if process is about to be 
   252                              <1> 	; terminated (u.bsys). If it is, 'sysexit' is called.
   253                              <1> 	; If not, following happens:	 
   254                              <1> 	; 	1) The user's stack pointer is restored.
   255                              <1> 	;	2) r1=0 and 'iget' is called to see if last mentioned
   256                              <1> 	;	   i-node has been modified. If it has, it is written out
   257                              <1> 	;	   via 'ppoke'.
   258                              <1> 	;	3) If the super block has been modified, it is written out
   259                              <1> 	;	   via 'ppoke'.				
   260                              <1> 	;	4) If the dismountable file system's super block has been
   261                              <1> 	;	   modified, it is written out to the specified device
   262                              <1> 	;	   via 'ppoke'.
   263                              <1> 	;	5) A check is made if user's time quantum (uquant) ran out
   264                              <1> 	;	   during his execution. If so, 'tswap' is called to give
   265                              <1> 	;	   another user a chance to run.
   266                              <1> 	;	6) 'sysret' now goes into 'sysrele'. 
   267                              <1> 	;	    (See 'sysrele' for conclusion.)		
   268                              <1> 	;
   269                              <1> 	; Calling sequence:
   270                              <1> 	;	jump table or 'br sysret'
   271                              <1> 	; Arguments: 
   272                              <1> 	;	-	
   273                              <1> 	; ...............................................................
   274                              <1> 	;	
   275                              <1> 	; ((AX=r1 for 'iget' input))
   276                              <1> 	;	
   277 0000BDBA 6631C0              <1> 	xor	ax, ax ; 04/05/2013
   278                              <1> sysret0: ; 29/07/2015 (eax = 0, jump from sysexec)
   279 0000BDBD FEC0                <1> 	inc	al ; 04/05/2013
   280 0000BDBF 3805[324A0100]      <1> 	cmp	[u.bsys], al ; 1
   281                              <1> 		; tstb u.bsys / is a process about to be terminated because
   282 0000BDC5 0F83EE000000        <1>         jnb     sysexit ; 04/05/2013
   283                              <1> 		; bne sysexit / of an error? yes, go to sysexit
   284                              <1> 	;mov	esp, [u.usp] ; 24/05/2013 (that is not needed here)
   285                              <1> 		; mov u.sp,sp / no point stack to users stack
   286 0000BDCB FEC8                <1> 	dec 	al ; mov ax, 0
   287                              <1> 		; clr r1 / zero r1 to check last mentioned i-node
   288 0000BDCD E88E2B0000          <1> 	call	iget
   289                              <1> 		; jsr r0,iget / if last mentioned i-node has been modified
   290                              <1> 		            ; / it is written out
   291                              <1> 	; 10/01/2017
   292                              <1> 	; 09/01/2017
   293                              <1> ;sysrele: ; < release >
   294                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   295                              <1> 	; 16/04/2015 - 14/10/2015 (Retro UNIX 386 v1)
   296                              <1> 	; 10/04/2013 - 07/03/2014 (Retro UNIX 8086 v1)
   297                              <1> 	;
   298                              <1> 	; 'sysrele' first calls 'tswap' if the time quantum for a user is
   299                              <1> 	;  zero (see 'sysret'). It then restores the user's registers and
   300                              <1> 	; turns off the system flag. It then checked to see if there is
   301                              <1> 	; an interrupt from the user by calling 'isintr'. If there is, 
   302                              <1> 	; the output gets flashed (see isintr) and interrupt action is
   303                              <1> 	; taken by a branch to 'intract'. If there is no interrupt from
   304                              <1> 	; the user, a rti is made.
   305                              <1> 	;
   306                              <1> 	; Calling sequence:
   307                              <1> 	;	Fall through a 'bne' in 'sysret' & ?
   308                              <1> 	; Arguments:
   309                              <1> 	;	-	
   310                              <1> 	; ...............................................................
   311                              <1> 	;	
   312                              <1> 	; 23/02/2014 (swapret)
   313                              <1> 	; 22/09/2013
   314                              <1> sysrel0: ;1:
   315 0000BDD2 803D[284A0100]00    <1> 	cmp	byte [u.quant], 0 ; 16/05/2013
   316                              <1> 		; tstb uquant / is the time quantum 0?
   317 0000BDD9 7705                <1>         ja      short swapret
   318                              <1> 		; bne 1f / no, don't swap it out
   319                              <1> sysrelease: ; 07/12/2013 (jump from 'clock')
   320 0000BDDB E8DB200000          <1> 	call	tswap
   321                              <1> 		; jsr r0,tswap / yes, swap it out
   322                              <1> 	
   323                              <1> ; Retro Unix 8086 v1 feature: return from 'swap' to 'swapret' address.
   324                              <1> swapret: ;1:
   325                              <1> 	; 10/09/2015
   326                              <1> 	; 01/09/2015
   327                              <1> 	; 14/05/2015
   328                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - 32 bit, pm modifications)
   329                              <1> 	; 26/05/2013 (Retro UNIX 8086 v1)
   330                              <1> 	; cli
   331                              <1> 	; 24/07/2015
   332                              <1> 	;
   333                              <1> 	;; 'esp' must be already equal to '[u.usp]' here ! 
   334                              <1> 	;; mov	esp, [u.usp]
   335                              <1> 
   336                              <1> 	; 22/09/2013
   337 0000BDE0 E87C2B0000          <1> 	call	isintr
   338                              <1> 	; 20/10/2013
   339 0000BDE5 7405                <1> 	jz	short sysrel1
   340 0000BDE7 E8B6000000          <1> 	call	intract
   341                              <1> 		; jsr r0,isintr / is there an interrupt from the user
   342                              <1> 		;     br intract / yes, output gets flushed, take interrupt
   343                              <1> 		               ; / action
   344                              <1> sysrel1:
   345 0000BDEC FA                  <1> 	cli	; 14/10/2015
   346                              <1> sysrel2:
   347 0000BDED FE0D[DB490100]      <1> 	dec	byte [sysflg]
   348                              <1> 		; decb sysflg / turn system flag off
   349                              <1> 	
   350 0000BDF3 A1[384A0100]        <1> 	mov	eax, [u.pgdir]	
   351 0000BDF8 0F22D8              <1> 	mov	cr3, eax  ; 1st PDE points to Kernel Page Table 0 (1st 4 MB)
   352                              <1> 			  ; (others are different than kernel page tables) 
   353                              <1> 	; 10/09/2015
   354 0000BDFB 61                  <1> 	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
   355                              <1> 		; mov (sp)+,sc / restore user registers
   356                              <1> 		; mov (sp)+,mq
   357                              <1> 		; mov (sp)+,ac
   358                              <1> 		; mov (sp)+,r5
   359                              <1> 		; mov (sp)+,r4
   360                              <1> 		; mov (sp)+,r3
   361                              <1> 		; mov (sp)+,r2
   362                              <1> 	;
   363 0000BDFC A1[E4490100]        <1> 	mov	eax, [u.r0]  ; ((return value in EAX))
   364 0000BE01 0FA9                <1> 	pop	gs
   365 0000BE03 0FA1                <1> 	pop	fs
   366 0000BE05 07                  <1> 	pop	es
   367 0000BE06 1F                  <1> 	pop	ds
   368                              <1> 	;or	word [esp+8], 200h ; 22/01/2017 ; force enabling interrupts
   369 0000BE07 CF                  <1> 	iretd	
   370                              <1> 		; rti / no, return from interrupt
   371                              <1> 
   372                              <1> sysrele:
   373                              <1> 	; 29/01/2017
   374                              <1> 	; 14/01/2017
   375                              <1> 	; 13/01/2017
   376                              <1> 	; 09/01/2017, 10/01/2017, 12/01/2017
   377                              <1> 	; Major modification for TRDOS 386 (CallBack return)
   378                              <1> 	;
   379                              <1> 	; 'sysrele' system call restores previously saved
   380                              <1> 	; registers and addresses of the process
   381                              <1> 	; (Main purpose -in TRDOS 386- is to return from
   382                              <1> 	; timer callback service routine in ring 3 -user mode-.)
   383                              <1> 	;
   384                              <1> 	; check if the process is in timer callback phase
   385 0000BE08 803D[544A0100]00    <1> 	cmp	byte [u.t_lock], 0 ; TIMER INT LOCK
   386 0000BE0F 74C1                <1> 	je	short sysrel0 ; classic (Retro UNIX 386 type) sysrele
   387                              <1> 	;xor	eax, eax
   388                              <1> 	;mov	byte [u.t_lock], al ; 0 ; reset
   389 0000BE11 0FB61D[334A0100]    <1> 	movzx	ebx, byte [u.uno] ; current process number
   390 0000BE18 66C1E302            <1> 	shl	bx, 2
   391                              <1> 	;cmp	[ebx+p.tcb-4], eax ; 0 ; is there callback address ?
   392                              <1> 	;jna	short sysrel0 
   393                              <1> 	; yes, reset callback address then restore process registers 
   394                              <1> 	;mov	[ebx+p.tcb-4], eax ; 0 ; reset
   395 0000BE1C 8B83[3C470100]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address
   396 0000BE22 FA                  <1> 	cli	; disable interrupts till 'iretd'
   397 0000BE23 E864210000          <1> 	call	rswap ; restore process 'u' structure
   398                              <1> 	; 14/01/2017
   399 0000BE28 28C0                <1> 	sub	al, al
   400 0000BE2A 3805[544A0100]      <1> 	cmp	[u.t_lock], al ; 0 ; TIMER INT LOCK
   401 0000BE30 770B                <1> 	ja	short sysrel4 ; yes
   402                              <1> sysrel3:
   403                              <1> 	; 29/01/2017
   404 0000BE32 8B44241C            <1> 	mov	eax, [esp+28]
   405 0000BE36 A3[E4490100]        <1> 	mov	[u.r0], eax
   406 0000BE3B EBB0                <1> 	jmp	short sysrel2
   407                              <1> sysrel4:
   408 0000BE3D A2[544A0100]        <1> 	mov	[u.t_lock], al ; 0 ; reset
   409 0000BE42 A0[554A0100]        <1> 	mov	al, [u.t_mode]
   410 0000BE47 20C0                <1> 	and	al, al
   411                              <1> 	;jnz	short sysrel2 ; 0FFh ; user mode
   412 0000BE49 75E7                <1> 	jnz	short sysrel3 ; 29/01/2017
   413 0000BE4B FEC8                <1> 	dec	al
   414 0000BE4D A2[554A0100]        <1> 	mov	[u.t_mode], al ; 0FFh ; not necessary !?
   415                              <1> 	; cpu will continue from the interrupted sytem call addr
   416 0000BE52 61                  <1> 	popad		; edi, esi, ebp, esp, ebx, edx, ecx, eax
   417 0000BE53 83C410              <1> 	add	esp, 16	; pass segment segisters: ds, es, fs, gs		
   418 0000BE56 CF                  <1> 	iretd		; eip, cs, eflags	
   419                              <1>  
   420                              <1> badsys:
   421                              <1> 	; 25/12/2016
   422                              <1> 	; 18/04/2016 (TRDOS 386 = TRDOS v2.0)
   423                              <1> 	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
   424                              <1> 	; 03/02/2011 ('trdos_ifc_routine')
   425                              <1> 	;
   426                              <1> 	; 16/04/2015 (Retro UNIX 386 v1, 'badsys')
   427                              <1> 	; (EIP, EAX values will be shown on screen with error message)
   428                              <1> 	; (EIP = 'CD 40h' instruction address -INT 40h-)
   429                              <1> 	; (EAX = Function number)  
   430                              <1> 	;
   431 0000BE57 FE05[324A0100]      <1> 	inc	byte [u.bsys]
   432                              <1> 	;
   433 0000BE5D 8B1D[DC490100]      <1> 	mov	ebx, [u.sp] ; esp at the beginning of 'sysent'
   434 0000BE63 8B03                <1> 	mov	eax, [ebx] ; EIP (return address, not 'INT 30h' address)
   435 0000BE65 83E802              <1> 	sub	eax, 2 ; CDh, ##h
   436 0000BE68 E88D74FFFF          <1> 	call	dwordtohex
   437 0000BE6D 8915[23F70000]      <1> 	mov	[eip_str], edx
   438 0000BE73 A3[27F70000]        <1> 	mov	[eip_str+4], eax
   439 0000BE78 A1[E4490100]        <1> 	mov	eax, [u.r0]
   440 0000BE7D E87874FFFF          <1> 	call	dwordtohex
   441 0000BE82 8915[12F70000]      <1> 	mov	[eax_str], edx
   442 0000BE88 A3[16F70000]        <1> 	mov	[eax_str+4], eax
   443                              <1> 
   444 0000BE8D 66C705[07F70000]34- <1> 	mov	word [int_num_str], SYSCALL_INT_NUM ; 25/12/2016
   444 0000BE95 30                  <1>
   445                              <1> 
   446 0000BE96 BE[D9F60000]        <1> 	mov	esi, ifc_msg ; "invalid funtion call !" msg (trdosk9.s)
   447 0000BE9B E8D19DFFFF          <1> 	call	print_msg
   448                              <1> 
   449 0000BEA0 EB17                <1> 	jmp	sysexit
   450                              <1> 
   451                              <1> intract: ; / interrupt action
   452                              <1> 	; 14/10/2015
   453                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   454                              <1> 	; 09/05/2013 - 07/12/2013 (Retro UNIX 8086 v1)
   455                              <1> 	;
   456                              <1> 	; Retro UNIX 8086 v1 modification !
   457                              <1> 	; (Process/task switching and quit routine by using
   458                              <1> 	; Retro UNIX 8086 v1 keyboard interrupt output.))
   459                              <1> 	;
   460                              <1> 	; input -> 'u.quit'  (also value of 'u.intr' > 0)
   461                              <1> 	; output -> If value of 'u.quit' = FFFFh ('ctrl+brk' sign)
   462                              <1> 	;		'intract' will jump to 'sysexit'.
   463                              <1> 	;	    Intract will return to the caller 
   464                              <1> 	;		if value of 'u.quit' <> FFFFh. 	 
   465                              <1> 	; 14/10/2015
   466 0000BEA2 FB                  <1> 	sti
   467                              <1> 	; 07/12/2013	
   468 0000BEA3 66FF05[2C4A0100]    <1> 	inc 	word [u.quit]
   469 0000BEAA 7408                <1> 	jz	short intrct0 ; FFFFh -> 0
   470 0000BEAC 66FF0D[2C4A0100]    <1> 	dec	word [u.quit]
   471                              <1> 	; 16/04/2015
   472 0000BEB3 C3                  <1> 	retn
   473                              <1> intrct0:	
   474 0000BEB4 58                  <1> 	pop	eax ; call intract -> retn
   475                              <1> 	;
   476 0000BEB5 31C0                <1> 	xor 	eax, eax
   477 0000BEB7 FEC0                <1> 	inc	al  ; mov ax, 1
   478                              <1> ;;;
   479                              <1> 	; UNIX v1 original 'intract' routine... 
   480                              <1> 	; / interrupt action
   481                              <1> 		;cmp *(sp),$rti / are you in a clock interrupt?
   482                              <1> 		; bne 1f / no, 1f
   483                              <1> 		; cmp (sp)+,(sp)+ / pop clock pointer
   484                              <1> 	; 1: / now in user area
   485                              <1> 		; mov r1,-(sp) / save r1
   486                              <1> 		; mov u.ttyp,r1 
   487                              <1> 			; / pointer to tty buffer in control-to r1
   488                              <1> 		; cmpb 6(r1),$177
   489                              <1> 			; / is the interrupt char equal to "del"
   490                              <1> 		; beq 1f / yes, 1f
   491                              <1> 		; clrb 6(r1) 
   492                              <1> 		        ; / no, clear the byte 
   493                              <1> 			; / (must be a quit character)
   494                              <1> 		; mov (sp)+,r1 / restore r1
   495                              <1> 		; clr u.quit / clear quit flag
   496                              <1> 		; bis $20,2(sp) 
   497                              <1> 		    	; / set trace for quit (sets t bit of 
   498                              <1> 			; / ps-trace trap)
   499                              <1> 		; rti   ;  / return from interrupt
   500                              <1> 	; 1: / interrupt char = del
   501                              <1> 		; clrb 6(r1) / clear the interrupt byte 
   502                              <1> 			   ; / in the buffer
   503                              <1> 		; mov (sp)+,r1 / restore r1
   504                              <1> 		; cmp u.intr,$core / should control be 
   505                              <1> 				; / transferred to loc core?
   506                              <1> 		; blo 1f
   507                              <1> 		; jmp *u.intr / user to do rti yes, 
   508                              <1> 				; / transfer to loc core
   509                              <1> 	; 1:
   510                              <1> 		; sys 1 / exit
   511                              <1> 
   512                              <1> sysexit: ; <terminate process>
   513                              <1> 	; 23/01/2017
   514                              <1> 	; 02/01/2017
   515                              <1> 	; 10/06/2016
   516                              <1> 	; 06/06/2016
   517                              <1> 	; 23/05/2016
   518                              <1> 	; 19/05/2016
   519                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   520                              <1> 	; 16/04/2015 - 01/09/2015 (Retro UNIX 386 v1)
   521                              <1> 	; 19/04/2013 - 14/02/2014 (Retro UNIX 8086 v1)
   522                              <1> 	;
   523                              <1> 	; 'sysexit' terminates a process. First each file that
   524                              <1> 	; the process has opened is closed by 'flose'. The process
   525                              <1> 	; status is then set to unused. The 'p.pid' table is then
   526                              <1> 	; searched to find children of the dying process. If any of
   527                              <1> 	; children are zombies (died by not waited for), they are
   528                              <1> 	; set free. The 'p.pid' table is then searched to find the
   529                              <1> 	; dying process's parent. When the parent is found, it is
   530                              <1> 	; checked to see if it is free or it is a zombie. If it is
   531                              <1> 	; one of these, the dying process just dies. If it is waiting
   532                              <1> 	; for a child process to die, it notified that it doesn't 
   533                              <1> 	; have to wait anymore by setting it's status from 2 to 1
   534                              <1> 	; (waiting to active). It is awakened and put on runq by
   535                              <1> 	; 'putlu'. The dying process enters a zombie state in which
   536                              <1> 	; it will never be run again but stays around until a 'wait'
   537                              <1> 	; is completed by it's parent process. If the parent is not
   538                              <1> 	; found, process just dies. This means 'swap' is called with
   539                              <1> 	; 'u.uno=0'. What this does is the 'wswap' is not called
   540                              <1> 	; to write out the process and 'rswap' reads the new process
   541                              <1> 	; over the one that dies..i.e., the dying process is 
   542                              <1> 	; overwritten and destroyed.	
   543                              <1>  	;
   544                              <1> 	; Calling sequence:
   545                              <1> 	;	sysexit or conditional branch.
   546                              <1> 	; Arguments:
   547                              <1> 	;	-	
   548                              <1> 	; ...............................................................
   549                              <1> 	;	
   550                              <1> 	; Retro UNIX 8086 v1 modification: 
   551                              <1> 	;       System call number (=1) is in EAX register.
   552                              <1> 	;
   553                              <1> 	;       Other parameters are in EDX, EBX, ECX, ESI, EDI, EBP
   554                              <1> 	;       registers depending of function details.
   555                              <1> 	;
   556                              <1> 	; ('swap' procedure is mostly different than original UNIX v1.)
   557                              <1> 	;
   558                              <1> ; / terminate process
   559                              <1> 	; AX = 1
   560 0000BEB9 6648                <1> 	dec 	ax ; 0
   561 0000BEBB 66A3[2A4A0100]      <1> 	mov	[u.intr], ax ; 0
   562                              <1> 		; clr u.intr / clear interrupt control word
   563                              <1> 		; clr r1 / clear r1
   564                              <1> sysexit_0:
   565                              <1> 	; 23/01/2017
   566                              <1> 	; 02/01/2017
   567                              <1> 	; 10/06/2016
   568                              <1> 	; 06/06/2016
   569                              <1> 	; 23/05/2016
   570                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
   571                              <1> 	; Check and stop/clear timer event(s) of this (dying) process
   572                              <1> 	; if there is.
   573                              <1> 
   574                              <1> 	; 02/01/2017 
   575 0000BEC1 FA                  <1> 	cli	; disable interrupts
   576                              <1> 	; 23/01/2017 - reset timer frequency (to 18.2Hz)
   577 0000BEC2 B036                <1> 	mov	al, 00110110b ; 36h
   578 0000BEC4 E643                <1>  	out	43h, al
   579 0000BEC6 28C0                <1> 	sub	al, al ; 0
   580 0000BEC8 E640                <1> 	out	40h, al ; LB
   581 0000BECA E640                <1> 	out	40h, al ; HB
   582                              <1>  	; 
   583 0000BECC 0FB61D[334A0100]    <1> 	movzx	ebx, byte [u.uno]
   584                              <1> 	;mov	bl, [u.uno] ; process number of dying process
   585 0000BED3 8A83[7F470100]      <1> 	mov 	al, [ebx+p.timer-1]
   586 0000BED9 20C0                <1> 	and	al, al
   587 0000BEDB 743B                <1> 	jz	short sysexit_12 ; no timer events for this process
   588 0000BEDD C683[7F470100]00    <1> 	mov	byte [ebx+p.timer-1], 0 ; reset
   589 0000BEE4 A0[3F410100]        <1> 	mov	al, [timer_events]
   590                              <1> 	;or	al, al
   591                              <1>  	;jz	short sysexit_12 ; no timer events
   592 0000BEE9 88C1                <1> 	mov	cl, al
   593                              <1> 	;cli	; disable interrupts 
   594 0000BEEB B410                <1> 	mov	ah, 16 ; number of available timer events
   595 0000BEED BE[7C4A0100]        <1> 	mov	esi, timer_set ; beginning address of timer events
   596                              <1> sysexit_7:
   597 0000BEF2 8A06                <1> 	mov	al, [esi] ; process number (of timer event)
   598 0000BEF4 38D8                <1> 	cmp	al, bl ; process number comparison
   599 0000BEF6 7411                <1> 	je	short sysexit_10
   600 0000BEF8 20C0                <1> 	and	al, al
   601 0000BEFA 7404                <1> 	jz	short sysexit_9
   602                              <1> sysexit_8:
   603 0000BEFC FEC9                <1> 	dec	cl
   604 0000BEFE 7416                <1> 	jz	short sysexit_11
   605                              <1> sysexit_9:
   606 0000BF00 FECC                <1> 	dec	ah
   607 0000BF02 7412                <1> 	jz	short sysexit_11
   608 0000BF04 83C610              <1> 	add	esi, 16
   609 0000BF07 EBE9                <1> 	jmp	short sysexit_7
   610                              <1> 
   611                              <1> sysexit_10:
   612                              <1> 	;mov	byte [esi], 0
   613 0000BF09 66C7060000          <1> 	mov	word [esi], 0
   614                              <1> 	;mov	dword [esi+12], 0
   615                              <1> 	;
   616 0000BF0E FE0D[3F410100]      <1> 	dec	byte [timer_events] ; 02/01/2017
   617                              <1> 	;
   618 0000BF14 EBE6                <1> 	jmp	short sysexit_8
   619                              <1> 
   620                              <1> sysexit_11:
   621 0000BF16 30C0                <1> 	xor	al, al
   622                              <1> sysexit_12: ; 2:
   623 0000BF18 FB                  <1> 	sti	; enable interrupts 
   624                              <1> 	;
   625                              <1> 	; AX = 0
   626                              <1> sysexit_1: ; 1:
   627                              <1> 	; AX = File descriptor
   628                              <1> 		; / r1 has file descriptor (index to u.fp list)
   629                              <1> 		; / Search the whole list
   630 0000BF19 E8D3130000          <1> 	call	fclose
   631                              <1> 		; jsr r0,fclose / close all files the process opened
   632                              <1> 	;; ignore error return
   633                              <1> 		; br .+2 / ignore error return
   634                              <1> 	;inc	ax
   635 0000BF1E FEC0                <1> 	inc	al
   636                              <1> 		; inc r1 / increment file descriptor
   637                              <1> 	;cmp	ax, 10
   638 0000BF20 3C0A                <1> 	cmp	al, 10
   639                              <1> 		; cmp r1,$10. / end of u.fp list?
   640 0000BF22 72F5                <1> 	jb	short sysexit_1
   641                              <1> 		; blt 1b / no, go back
   642                              <1> 	;movzx	ebx, byte [u.uno]
   643 0000BF24 8A1D[334A0100]      <1> 	mov	bl, [u.uno] ; 02/01/2017
   644                              <1> 		; movb	u.uno,r1 / yes, move dying process's number to r1
   645 0000BF2A 88A3[2F470100]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   646                              <1> 		; clrb p.stat-1(r1) / free the process
   647                              <1> 	;shl	bx, 1
   648 0000BF30 D0E3                <1> 	shl	bl, 1
   649                              <1> 		; asl r1 / use r1 for index into the below tables
   650 0000BF32 668B8B[9E460100]    <1> 	mov	cx, [ebx+p.pid-2]
   651                              <1> 		; mov p.pid-2(r1),r3 / move dying process's name to r3
   652 0000BF39 668B93[BE460100]    <1> 	mov	dx, [ebx+p.ppid-2]
   653                              <1> 		; mov p.ppid-2(r1),r4 / move its parents name to r4
   654                              <1> 	; xor 	bx, bx ; 0
   655 0000BF40 30DB                <1> 	xor	bl, bl ; 0
   656                              <1> 		; clr r2
   657 0000BF42 31F6                <1> 	xor	esi, esi ; 0
   658                              <1> 		; clr r5 / initialize reg
   659                              <1> sysexit_2: ; 1:
   660                              <1> 	        ; / find children of this dying process, 
   661                              <1> 		; / if they are zombies, free them
   662                              <1> 	;add	bx, 2
   663 0000BF44 80C302              <1> 	add	bl, 2
   664                              <1> 		; add $2,r2 / search parent process table 
   665                              <1> 		          ; / for dying process's name
   666 0000BF47 66398B[BE460100]    <1> 	cmp	[ebx+p.ppid-2], cx
   667                              <1> 		; cmp p.ppid-2(r2),r3 / found it?
   668 0000BF4E 7513                <1> 	jne	short sysexit_4
   669                              <1> 		; bne 3f / no
   670                              <1> 	;shr	bx, 1
   671 0000BF50 D0EB                <1> 	shr	bl, 1
   672                              <1> 		; asr r2 / yes, it is a parent
   673 0000BF52 80BB[2F470100]03    <1> 	cmp	byte [ebx+p.stat-1], 3 ; SZOMB
   674                              <1> 		; cmpb p.stat-1(r2),$3 / is the child of this 
   675                              <1> 				     ; / dying process a zombie
   676 0000BF59 7506                <1> 	jne	short sysexit_3 
   677                              <1> 		; bne 2f / no
   678 0000BF5B 88A3[2F470100]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   679                              <1> 		; clrb p.stat-1(r2) / yes, free the child process
   680                              <1> sysexit_3: ; 2:
   681                              <1> 	;shr	bx, 1
   682 0000BF61 D0E3                <1> 	shl	bl, 1
   683                              <1> 		; asl r2
   684                              <1> sysexit_4: ; 3:
   685                              <1> 		; / search the process name table 
   686                              <1> 		; / for the dying process's parent
   687 0000BF63 663993[9E460100]    <1> 	cmp	[ebx+p.pid-2], dx
   688                              <1> 		; cmp p.pid-2(r2),r4 / found it?
   689 0000BF6A 7502                <1> 	jne	short sysexit_5
   690                              <1> 		; bne 3f / no
   691 0000BF6C 89DE                <1> 	mov	esi, ebx
   692                              <1> 		; mov r2,r5 / yes, put index to p.pid table (parents
   693                              <1> 		          ; / process # x2) in r5
   694                              <1> sysexit_5: ; 3:
   695                              <1> 	;cmp	bx, nproc + nproc
   696 0000BF6E 80FB20              <1> 	cmp	bl, nproc + nproc
   697                              <1> 		; cmp r2,$nproc+nproc / has whole table been searched?
   698 0000BF71 72D1                <1> 	jb	short sysexit_2
   699                              <1> 		; blt 1b / no, go back
   700                              <1> 		; mov r5,r1 / yes, r1 now has parents process # x2
   701 0000BF73 21F6                <1> 	and	esi, esi ; r5=r1
   702 0000BF75 7436                <1> 	jz	short sysexit_6
   703                              <1> 		; beq 2f / no parent has been found. 
   704                              <1> 		       ; / The process just dies
   705 0000BF77 66D1EE              <1> 	shr	si, 1
   706                              <1> 		; asr r1 / set up index to p.stat
   707 0000BF7A 8A86[2F470100]      <1> 	mov	al, [esi+p.stat-1]
   708                              <1> 		; movb p.stat-1(r1),r2 / move status of parent to r2
   709 0000BF80 20C0                <1> 	and	al, al
   710 0000BF82 7429                <1> 	jz	short sysexit_6
   711                              <1> 		; beq 2f / if its been freed, 2f
   712 0000BF84 3C03                <1> 	cmp	al, 3
   713                              <1> 		; cmp r2,$3 / is parent a zombie?
   714 0000BF86 7425                <1> 	je	short sysexit_6
   715                              <1> 		; beq 2f / yes, 2f
   716                              <1> 	; BH = 0
   717 0000BF88 8A1D[334A0100]      <1> 	mov	bl, [u.uno]
   718                              <1> 		; movb u.uno,r3 / move dying process's number to r3
   719 0000BF8E C683[2F470100]03    <1> 	mov	byte [ebx+p.stat-1], 3  ; SZOMB
   720                              <1> 		; movb $3,p.stat-1(r3) / make the process a zombie
   721 0000BF95 3C01                <1> 	cmp	al, 1 ; SRUN
   722 0000BF97 7414                <1> 	je	short sysexit_6
   723                              <1> 	;cmp	al, 2
   724                              <1> 		; cmp r2,$2 / is the parent waiting for 
   725                              <1> 			  ; / this child to die
   726                              <1> 	;jne	short sysexit_6	
   727                              <1> 		; bne 2f / yes, notify parent not to wait any more
   728                              <1> 	; p.stat = 2 --> waiting
   729                              <1> 	; p.stat = 4 --> sleeping
   730 0000BF99 C686[2F470100]01    <1> 	mov	byte [esi+p.stat-1], 1 ; SRUN
   731                              <1> 	;dec	byte [esi+p.stat-1]
   732                              <1> 		; decb	p.stat-1(r1) / awaken it by putting it (parent)
   733 0000BFA0 6689F0              <1> 	mov	ax, si ; r1  (process number in AL)
   734                              <1> 	; 
   735                              <1> 	;mov	ebx, runq + 4
   736                              <1> 		; mov $runq+4,r2 / on the runq
   737 0000BFA3 BB[D4490100]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017
   738 0000BFA8 E808200000          <1> 	call	putlu
   739                              <1> 		; jsr r0, putlu
   740                              <1> sysexit_6: 
   741                              <1> 		; / the process dies
   742 0000BFAD C605[334A0100]00    <1> 	mov	byte [u.uno], 0
   743                              <1> 		; clrb u.uno / put zero as the process number, 
   744                              <1> 	           ; / so "swap" will
   745 0000BFB4 E81C1F0000          <1> 	call	swap
   746                              <1> 		; jsr r0,swap / overwrite process with another process
   747                              <1> 
   748                              <1> hlt_sys:
   749                              <1> 	;sti
   750                              <1> hlts0:
   751 0000BFB9 F4                  <1> 	hlt
   752 0000BFBA EBFD                <1> 	jmp	short hlts0
   753                              <1> 		; 0 / and thereby kill it; halt?
   754                              <1> 
   755                              <1> syswait: ; < wait for a processs to die >
   756                              <1> 	; 17/09/2015
   757                              <1> 	; 02/09/2015
   758                              <1> 	; 01/09/2015
   759                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   760                              <1> 	; 24/05/2013 - 05/02/2014 (Retro UNIX 8086 v1)
   761                              <1> 	;
   762                              <1> 	; 'syswait' waits for a process die. 
   763                              <1> 	; It works in following way:
   764                              <1> 	;    1) From the parent process number, the parent's 
   765                              <1> 	; 	process name is found. The p.ppid table of parent
   766                              <1> 	;	names is then searched for this process name.
   767                              <1> 	;	If a match occurs, r2 contains child's process
   768                              <1> 	;	number. The child status is checked to see if it is
   769                              <1> 	;	a zombie, i.e; dead but not waited for (p.stat=3)
   770                              <1> 	;	If it is, the child process is freed and it's name
   771                              <1> 	;	is put in (u.r0). A return is then made via 'sysret'.
   772                              <1> 	;	If the child is not a zombie, nothing happens and
   773                              <1> 	;	the search goes on through the p.ppid table until
   774                              <1> 	;	all processes are checked or a zombie is found.
   775                              <1> 	;    2) If no zombies are found, a check is made to see if
   776                              <1> 	;	there are any children at all. If there are none,
   777                              <1> 	;	an error return is made. If there are, the parent's
   778                              <1> 	;	status is set to 2 (waiting for child to die),
   779                              <1> 	;	the parent is swapped out, and a branch to 'syswait'
   780                              <1> 	;	is made to wait on the next process.
   781                              <1> 	;
   782                              <1> 	; Calling sequence:
   783                              <1> 	;	?
   784                              <1> 	; Arguments:
   785                              <1> 	;	-
   786                              <1> 	; Inputs: - 
   787                              <1> 	; Outputs: if zombie found, it's name put in u.r0.	
   788                              <1> 	; ...............................................................
   789                              <1> 	;				
   790                              <1> 	
   791                              <1> ; / wait for a process to die
   792                              <1> 
   793                              <1> syswait_0:
   794 0000BFBC 0FB61D[334A0100]    <1> 	movzx	ebx, byte [u.uno] ; 01/09/2015
   795                              <1> 		; movb u.uno,r1 / put parents process number in r1
   796 0000BFC3 D0E3                <1> 	shl	bl, 1
   797                              <1> 	;shl	bx, 1
   798                              <1> 		; asl r1 / x2 to get index into p.pid table
   799 0000BFC5 668B83[9E460100]    <1> 	mov	ax, [ebx+p.pid-2]
   800                              <1> 		; mov p.pid-2(r1),r1 / get the name of this process
   801 0000BFCC 31F6                <1> 	xor	esi, esi
   802                              <1> 		; clr r2
   803 0000BFCE 31C9                <1> 	xor	ecx, ecx ; 30/10/2013
   804                              <1> 	;xor 	cl, cl
   805                              <1> 		; clr r3 / initialize reg 3
   806                              <1> syswait_1: ; 1:
   807 0000BFD0 6683C602            <1> 	add	si, 2
   808                              <1> 		; add $2,r2 / use r2 for index into p.ppid table
   809                              <1> 			  ; / search table of parent processes 
   810                              <1> 			  ; / for this process name
   811 0000BFD4 663B86[BE460100]    <1> 	cmp	ax, [esi+p.ppid-2]
   812                              <1> 		; cmp p.ppid-2(r2),r1 / r2 will contain the childs 
   813                              <1> 			            ; / process number
   814 0000BFDB 7535                <1> 	jne	short syswait_3
   815                              <1> 		;bne 3f / branch if no match of parent process name
   816                              <1> 	;inc	cx
   817 0000BFDD FEC1                <1> 	inc	cl
   818                              <1> 		;inc r3 / yes, a match, r3 indicates number of children
   819 0000BFDF 66D1EE              <1> 	shr	si, 1
   820                              <1> 		; asr r2 / r2/2 to get index to p.stat table
   821                              <1> 	; The possible states ('p.stat' values) of a process are:
   822                              <1> 	;	0 = free or unused
   823                              <1> 	;	1 = active
   824                              <1> 	;	2 = waiting for a child process to die
   825                              <1> 	;	3 = terminated, but not yet waited for (zombie).	
   826 0000BFE2 80BE[2F470100]03    <1> 	cmp	byte [esi+p.stat-1], 3 ; SZOMB, 05/02/2014
   827                              <1> 		; cmpb p.stat-1(r2),$3 / is the child process a zombie?
   828 0000BFE9 7524                <1> 	jne	short syswait_2
   829                              <1> 		; bne 2f / no, skip it
   830 0000BFEB 88BE[2F470100]      <1> 	mov	[esi+p.stat-1], bh ; 0
   831                              <1> 		; clrb p.stat-1(r2) / yes, free it
   832 0000BFF1 66D1E6              <1> 	shl	si, 1
   833                              <1> 		; asl r2 / r2x2 to get index into p.pid table
   834 0000BFF4 0FB786[9E460100]    <1> 	movzx	eax, word [esi+p.pid-2]
   835 0000BFFB A3[E4490100]        <1> 	mov	[u.r0], eax
   836                              <1> 		; mov p.pid-2(r2),*u.r0 
   837                              <1> 			      ; / put childs process name in (u.r0)
   838                              <1> 	;
   839                              <1> 	; Retro UNIX 386 v1 modification ! (17/09/2015)
   840                              <1> 	;
   841                              <1> 	; Parent process ID -p.ppid- field (of the child process)
   842                              <1> 	; must be cleared in order to prevent infinitive 'syswait'
   843                              <1> 	; system call loop from the application/program if it calls
   844                              <1> 	; 'syswait' again (mistakenly) while there is not a zombie
   845                              <1> 	; or running child process to wait. ('forktest.s', 17/09/2015)
   846                              <1> 	;
   847                              <1> 	; Note: syswait will return with error if there is not a
   848                              <1> 	;       zombie or running process to wait.	
   849                              <1> 	;
   850 0000C000 6629C0              <1> 	sub	ax, ax
   851 0000C003 668986[BE460100]    <1> 	mov 	[esi+p.ppid-2], ax ; 0 ; 17/09/2015
   852 0000C00A E9AEFDFFFF          <1> 	jmp	sysret0 ; ax = 0
   853                              <1> 	;
   854                              <1> 	;jmp	sysret
   855                              <1> 		; br sysret1 / return cause child is dead
   856                              <1> syswait_2: ; 2:
   857 0000C00F 66D1E6              <1> 	shl	si, 1
   858                              <1> 		; asl r2 / r2x2 to get index into p.ppid table
   859                              <1> syswait_3: ; 3:
   860 0000C012 6683FE20            <1> 	cmp	si, nproc+nproc
   861                              <1> 		; cmp r2,$nproc+nproc / have all processes been checked?
   862 0000C016 72B8                <1> 	jb	short syswait_1
   863                              <1> 		; blt 1b / no, continue search
   864                              <1> 	;and	cx, cx
   865 0000C018 20C9                <1> 	and	cl, cl
   866                              <1> 		; tst r3 / one gets here if there are no children 
   867                              <1> 		       ; / or children that are still active
   868                              <1> 	; 30/10/2013
   869 0000C01A 750B                <1> 	jnz	short syswait_4
   870                              <1> 	;jz	error
   871                              <1> 		; beq error1 / there are no children, error
   872 0000C01C 890D[E4490100]      <1> 	mov	[u.r0], ecx ; 0
   873 0000C022 E973FDFFFF          <1> 	jmp	error
   874                              <1> syswait_4:
   875 0000C027 8A1D[334A0100]      <1> 	mov	bl, [u.uno]
   876                              <1> 		; movb u.uno,r1 / there are children so put 
   877                              <1> 			      ; / parent process number in r1
   878 0000C02D FE83[2F470100]      <1> 	inc	byte [ebx+p.stat-1] ; 2, SWAIT, 05/02/2014
   879                              <1> 		; incb p.stat-1(r1) / it is waiting for 
   880                              <1> 				  ; / other children to die
   881                              <1> 	; 04/11/2013
   882 0000C033 E89D1E0000          <1> 	call	swap
   883                              <1> 		; jsr r0,swap / swap it out, because it's waiting
   884 0000C038 EB82                <1> 	jmp	syswait_0
   885                              <1> 		; br syswait / wait on next process
   886                              <1> 
   887                              <1> sysfork: ; < create a new process >
   888                              <1> 	; 02/01/2017 (TRDOS 386 modification)
   889                              <1> 	; 04/09/2015, 18/05/2015
   890                              <1> 	; 28/08/2015, 01/09/2015, 02/09/2015
   891                              <1> 	; 09/05/2015, 10/05/2015, 14/05/2015
   892                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 - Beginning)
   893                              <1> 	; 24/05/2013 - 14/02/2014 (Retro UNIX 8086 v1)
   894                              <1> 	;
   895                              <1> 	; 'sysfork' creates a new process. This process is referred
   896                              <1> 	; to as the child process. This new process core image is
   897                              <1> 	; a copy of that of the caller of 'sysfork'. The only
   898                              <1> 	; distinction is the return location and the fact that (u.r0)
   899                              <1> 	; in the old process (parent) contains the process id (p.pid)
   900                              <1> 	; of the new process (child). This id is used by 'syswait'.
   901                              <1> 	; 'sysfork' works in the following manner: 	
   902                              <1> 	;    1) The process status table (p.stat) is searched to find
   903                              <1> 	;	a process number that is unused. If none are found
   904                              <1> 	;	an error occurs.
   905                              <1> 	;    2) when one is found, it becomes the child process number
   906                              <1> 	;	and it's status (p.stat) is set to active.
   907                              <1> 	;    3) If the parent had a control tty, the interrupt 
   908                              <1> 	;	character in that tty buffer is cleared.
   909                              <1> 	;    4) The child process is put on the lowest priority run 
   910                              <1> 	;	queue via 'putlu'.
   911                              <1> 	;    5) A new process name is gotten from 'mpid' (actually 
   912                              <1> 	;	it is a unique number) and is put in the child's unique
   913                              <1> 	;	identifier; process id (p.pid).
   914                              <1> 	;    6) The process name of the parent is then obtained and
   915                              <1> 	;	placed in the unique identifier of the parent process
   916                              <1> 	;	name is then put in 'u.r0'.	
   917                              <1> 	;    7) The child process is then written out on disk by
   918                              <1> 	;	'wswap',i.e., the parent process is copied onto disk
   919                              <1> 	;	and the child is born. (The child process is written 
   920                              <1> 	;	out on disk/drum with 'u.uno' being the child process
   921                              <1> 	;	number.)
   922                              <1> 	;    8) The parent process number is then restored to 'u.uno'.
   923                              <1> 	;    9) The child process name is put in 'u.r0'.
   924                              <1> 	;   10) The pc on the stack sp + 18 is incremented by 2 to
   925                              <1> 	;	create the return address for the parent process.
   926                              <1> 	;   11) The 'u.fp' list as then searched to see what files
   927                              <1> 	;	the parent has opened. For each file the parent has
   928                              <1> 	;	opened, the corresponding 'fsp' entry must be updated
   929                              <1> 	;	to indicate that the child process also has opened
   930                              <1> 	;	the file. A branch to 'sysret' is then made.	 			 				
   931                              <1> 	;
   932                              <1> 	; Calling sequence:
   933                              <1> 	;	from shell ?
   934                              <1> 	; Arguments:
   935                              <1> 	;	-
   936                              <1> 	; Inputs: -
   937                              <1> 	; Outputs: *u.r0 - child process name
   938                              <1> 	; ...............................................................
   939                              <1> 	;	
   940                              <1> 	; Retro UNIX 8086 v1 modification: 
   941                              <1> 	;	AX = r0 = PID (>0) (at the return of 'sysfork')
   942                              <1> 	;	= process id of child a parent process returns
   943                              <1> 	;	= process id of parent when a child process returns
   944                              <1> 	;
   945                              <1> 	;       In original UNIX v1, sysfork is called and returns as
   946                              <1> 	;	in following manner: (with an example: c library, fork)
   947                              <1> 	;	
   948                              <1> 	;	1:
   949                              <1> 	;		sys	fork
   950                              <1> 	;			br 1f  / child process returns here
   951                              <1> 	;		bes	2f     / parent process returns here
   952                              <1> 	;		/ pid of new process in r0
   953                              <1> 	;		rts	pc
   954                              <1> 	;	2: / parent process condionally branches here
   955                              <1> 	;		mov	$-1,r0 / pid = -1 means error return
   956                              <1> 	;		rts	pc
   957                              <1> 	;
   958                              <1> 	;	1: / child process brances here
   959                              <1> 	;		clr	r0   / pid = 0 in child process
   960                              <1> 	;		rts	pc
   961                              <1> 	;
   962                              <1> 	;	In UNIX v7x86 (386) by Robert Nordier (1999)
   963                              <1> 	;		// pid = fork();
   964                              <1> 	;		//
   965                              <1> 	;		// pid == 0 in child process; 
   966                              <1> 	;		// pid == -1 means error return
   967                              <1> 	;		// in child, 
   968                              <1> 	;		//	parents id is in par_uid if needed
   969                              <1> 	;		
   970                              <1> 	;		_fork:
   971                              <1> 	;			mov	$.fork,eax
   972                              <1> 	;			int	$0x30
   973                              <1> 	;			jmp	1f
   974                              <1> 	;			jnc	2f
   975                              <1> 	;			jmp	cerror
   976                              <1> 	;		1:
   977                              <1> 	;			mov	eax,_par_uid
   978                              <1> 	;			xor	eax,eax
   979                              <1> 	;		2:
   980                              <1> 	;			ret
   981                              <1> 	;
   982                              <1> 	;	In Retro UNIX 8086 v1,
   983                              <1> 	;	'sysfork' returns in following manner:
   984                              <1> 	;	
   985                              <1> 	;		mov	ax, sys_fork
   986                              <1> 	;		mov	bx, offset @f ; routine for child
   987                              <1> 	;		int	20h
   988                              <1> 	;		jc	error
   989                              <1> 	;		
   990                              <1> 	;	; Routine for parent process here (just after 'jc')
   991                              <1> 	;		mov	word ptr [pid_of_child], ax
   992                              <1> 	;		jmp	next_routine_for_parent	
   993                              <1> 	;
   994                              <1> 	;	@@: ; routine for child process here				
   995                              <1> 	;		....	
   996                              <1> 	;	NOTE: 'sysfork' returns to specified offset
   997                              <1> 	;	       for child process by using BX input.
   998                              <1> 	;	      (at first, parent process will return then 
   999                              <1> 	;	      child process will return -after swapped in-
  1000                              <1> 	;	      'syswait' is needed in parent process
  1001                              <1> 	;	      if return from child process will be waited for.)
  1002                              <1> 	;	  				
  1003                              <1> 	
  1004                              <1> ; / create a new process
  1005                              <1> 	; EBX = return address for child process 
  1006                              <1> 	     ; (Retro UNIX 8086 v1 modification !)
  1007 0000C03A 31F6                <1> 	xor 	esi, esi
  1008                              <1> 		; clr r1
  1009                              <1> sysfork_1: ; 1: / search p.stat table for unused process number
  1010 0000C03C 46                  <1> 	inc	esi
  1011                              <1> 		; inc r1
  1012 0000C03D 80BE[2F470100]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE, 05/02/2014
  1013                              <1> 		; tstb p.stat-1(r1) / is process active, unused, dead
  1014 0000C044 760B                <1> 	jna	short sysfork_2	
  1015                              <1> 		; beq 1f / it's unused so branch
  1016 0000C046 6683FE10            <1> 	cmp	si, nproc
  1017                              <1> 		; cmp r1,$nproc / all processes checked
  1018 0000C04A 72F0                <1> 	jb	short sysfork_1
  1019                              <1> 		; blt 1b / no, branch back
  1020                              <1> 	;
  1021                              <1> 	; Retro UNIX 8086 v1. modification:
  1022                              <1> 	;	Parent process returns from 'sysfork' to address 
  1023                              <1> 	;	which is just after 'sysfork' system call in parent
  1024                              <1> 	;	process. Child process returns to address which is put
  1025                              <1> 	;	in BX register by parent process for 'sysfork'. 
  1026                              <1> 	;
  1027                              <1> 		;add $2,18.(sp) / add 2 to pc when trap occured, points
  1028                              <1> 		             ; / to old process return
  1029                              <1> 		; br error1 / no room for a new process
  1030 0000C04C E949FDFFFF          <1> 	jmp	error
  1031                              <1> sysfork_2: ; 1:
  1032 0000C051 E8158BFFFF          <1> 	call	allocate_page
  1033 0000C056 0F823EFDFFFF        <1> 	jc	error
  1034 0000C05C 50                  <1> 	push	eax   ; UPAGE (user structure page) address
  1035                              <1> 	; Retro UNIX 386 v1 modification!
  1036 0000C05D E8188DFFFF          <1> 	call	duplicate_page_dir
  1037                              <1> 		; EAX = New page directory 
  1038 0000C062 730B                <1> 	jnc	short sysfork_3
  1039 0000C064 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1040 0000C065 E8DF8CFFFF          <1> 	call 	deallocate_page
  1041 0000C06A E92BFDFFFF          <1> 	jmp	error
  1042                              <1> sysfork_3:
  1043                              <1> 	; Retro UNIX 386 v1 modification !
  1044 0000C06F 56                  <1> 	push	esi
  1045 0000C070 E8EE1E0000          <1> 	call	wswap ; save current user (u) structure, user registers
  1046                              <1> 		      ; and interrupt return components (for IRET)
  1047 0000C075 8705[384A0100]      <1> 	xchg	eax, [u.pgdir] ; page directory of the child process
  1048 0000C07B A3[3C4A0100]        <1> 	mov	[u.ppgdir], eax ; page directory of the parent process
  1049 0000C080 5E                  <1> 	pop	esi
  1050 0000C081 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1051                              <1> 		; [u.usp] = esp
  1052 0000C082 89F7                <1> 	mov	edi, esi
  1053 0000C084 66C1E702            <1> 	shl	di, 2
  1054 0000C088 8987[3C470100]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
  1055 0000C08E A3[344A0100]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
  1056                              <1> 	; 28/08/2015
  1057 0000C093 0FB605[334A0100]    <1> 	movzx	eax, byte [u.uno] ; parent process number
  1058                              <1> 		; movb u.uno,-(sp) / save parent process number
  1059 0000C09A 89C7                <1> 	mov	edi, eax
  1060 0000C09C 50                  <1>         push	eax ; ** 
  1061 0000C09D 8A87[FF460100]      <1> 	mov     al, [edi+p.ttyc-1] ; console tty (parent)
  1062                              <1> 	; 18/09/2015
  1063                              <1> 	;mov     [esi+p.ttyc-1], al ; set child's console tty
  1064                              <1> 	;mov     [esi+p.waitc-1], ah ; 0 ; reset child's wait channel
  1065 0000C0A3 668986[FF460100]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
  1066                              <1> 				   ; ah - reset child's wait channel	
  1067 0000C0AA 89F0                <1> 	mov	eax, esi
  1068 0000C0AC A2[334A0100]        <1> 	mov	[u.uno], al ; child process number
  1069                              <1> 		;movb r1,u.uno / set child process number to r1
  1070 0000C0B1 FE86[2F470100]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN, 05/02/2014
  1071                              <1> 		; incb p.stat-1(r1) / set p.stat entry for child 
  1072                              <1> 				; / process to active status
  1073                              <1> 		; mov u.ttyp,r2 / put pointer to parent process' 
  1074                              <1> 			      ; / control tty buffer in r2
  1075                              <1>                 ; beq 2f / branch, if no such tty assigned
  1076                              <1> 		; clrb 6(r2) / clear interrupt character in tty buffer
  1077                              <1> 	; 2:
  1078 0000C0B7 53                  <1> 	push	ebx  ; * return address for the child process
  1079                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1080                              <1> 	; (Retro UNIX 8086 v1 modification!)
  1081                              <1> 		; mov $runq+4,r2
  1082 0000C0B8 BB[D4490100]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017  
  1083 0000C0BD E8F31E0000          <1> 	call	putlu
  1084                              <1>  		; jsr r0,putlu / put child process on lowest priority 
  1085                              <1> 			   ; / run queue
  1086 0000C0C2 66D1E6              <1> 	shl	si, 1
  1087                              <1> 		; asl r1 / multiply r1 by 2 to get index 
  1088                              <1> 		       ; / into p.pid table
  1089 0000C0C5 66FF05[CE490100]    <1> 	inc	word [mpid]
  1090                              <1> 		; inc mpid / increment m.pid; get a new process name
  1091 0000C0CC 66A1[CE490100]      <1> 	mov	ax, [mpid]
  1092 0000C0D2 668986[9E460100]    <1> 	mov	[esi+p.pid-2], ax
  1093                              <1> 		;mov mpid,p.pid-2(r1) / put new process name 
  1094                              <1> 				    ; / in child process' name slot
  1095 0000C0D9 5A                  <1> 	pop	edx  ; * return address for the child process
  1096                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1097 0000C0DA 5B                  <1>   	pop	ebx  ; **
  1098                              <1> 	;mov	ebx, [esp] ; ** parent process number
  1099                              <1> 		; movb (sp),r2 / put parent process number in r2
  1100 0000C0DB 66D1E3              <1> 	shl 	bx, 1
  1101                              <1> 		;asl r2 / multiply by 2 to get index into below tables
  1102                              <1> 	;movzx eax, word [ebx+p.pid-2]
  1103 0000C0DE 668B83[9E460100]    <1> 	mov	ax, [ebx+p.pid-2]
  1104                              <1> 		; mov p.pid-2(r2),r2 / get process name of parent
  1105                              <1> 				   ; / process
  1106 0000C0E5 668986[BE460100]    <1> 	mov	[esi+p.ppid-2], ax
  1107                              <1> 		; mov r2,p.ppid-2(r1) / put parent process name 
  1108                              <1> 			  ; / in parent process slot for child
  1109 0000C0EC A3[E4490100]        <1> 	mov	[u.r0], eax	
  1110                              <1> 		; mov r2,*u.r0 / put parent process name on stack 
  1111                              <1> 			     ; / at location where r0 was saved
  1112 0000C0F1 8B2D[DC490100]      <1> 	mov 	ebp, [u.sp] ; points to return address (EIP for IRET)
  1113 0000C0F7 895500              <1> 	mov	[ebp], edx ; *, CS:EIP -> EIP
  1114                              <1> 			   ; * return address for the child process
  1115                              <1> 		; mov $sysret1,-(sp) /
  1116                              <1> 		; mov sp,u.usp / contents of sp at the time when 
  1117                              <1> 			      ; / user is swapped out
  1118                              <1> 		; mov $sstack,sp / point sp to swapping stack space
  1119                              <1> 	; 04/09/2015 - 01/09/2015
  1120                              <1> 	; [u.usp] = esp
  1121 0000C0FA 68[BABD0000]        <1> 	push	sysret ; ***
  1122 0000C0FF 8925[E0490100]      <1> 	mov	[u.usp], esp ; points to 'sysret' address (***)
  1123                              <1> 			     ; (for child process)	
  1124 0000C105 31C0                <1> 	xor 	eax, eax
  1125 0000C107 66A3[144A0100]      <1> 	mov 	[u.ttyp], ax ; 0
  1126                              <1> 	;
  1127 0000C10D E8511E0000          <1> 	call	wswap ; Retro UNIX 8086 v1 modification !
  1128                              <1> 		;jsr r0,wswap / put child process out on drum
  1129                              <1> 		;jsr r0,unpack / unpack user stack
  1130                              <1> 		;mov u.usp,sp / restore user stack pointer
  1131                              <1> 		; tst (sp)+ / bump stack pointer
  1132                              <1> 	; Retro UNIX 386 v1 modification !
  1133 0000C112 58                  <1> 	pop	eax ; ***
  1134 0000C113 66D1E3              <1> 	shl	bx, 1
  1135 0000C116 8B83[3C470100]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address ; 14/05/2015
  1136 0000C11C E86B1E0000          <1> 	call	rswap ; restore parent process 'u' structure, 
  1137                              <1> 		      ; registers and return address (for IRET)
  1138                              <1> 		;movb (sp)+,u.uno / put parent process number in u.uno
  1139 0000C121 0FB705[CE490100]    <1>         movzx   eax, word [mpid]
  1140 0000C128 A3[E4490100]        <1> 	mov	[u.r0], eax
  1141                              <1> 		; mov mpid,*u.r0 / put child process name on stack 
  1142                              <1> 			       ; / where r0 was saved
  1143                              <1> 		; add $2,18.(sp) / add 2 to pc on stack; gives parent
  1144                              <1> 			          ; / process return
  1145                              <1> 	;xor	ebx, ebx
  1146 0000C12D 31F6                <1> 	xor     esi, esi
  1147                              <1> 		;clr r1
  1148                              <1> sysfork_4: ; 1: / search u.fp list to find the files 
  1149                              <1> 	      ; / opened by the parent process
  1150                              <1> 	; 01/09/2015
  1151                              <1> 	;xor	bh, bh
  1152                              <1> 	;mov 	bl, [esi+u.fp]
  1153 0000C12F 8A86[EA490100]      <1> 	mov 	al, [esi+u.fp]
  1154                              <1> 		; movb u.fp(r1),r2 / get an open file for this process
  1155                              <1>         ;or      bl, bl
  1156 0000C135 08C0                <1> 	or	al, al
  1157 0000C137 740D                <1> 	jz	short sysfork_5	
  1158                              <1> 		; beq 2f / file has not been opened by parent, 
  1159                              <1> 		       ; / so branch
  1160 0000C139 B40A                <1> 	mov	ah, 10 ; Retro UNIX 386 v1 fsp structure size = 10 bytes
  1161 0000C13B F6E4                <1> 	mul	ah
  1162                              <1> 	;movzx	ebx, ax
  1163 0000C13D 6689C3              <1> 	mov	bx, ax
  1164                              <1> 	;shl     bx, 3
  1165                              <1> 		; asl r2 / multiply by 8
  1166                              <1>        		; asl r2 / to get index into fsp table
  1167                              <1>        		; asl r2
  1168 0000C140 FE83[CE470100]      <1>   	inc     byte [ebx+fsp-2]
  1169                              <1> 		; incb fsp-2(r2) / increment number of processes
  1170                              <1> 			     ; / using file, because child will now be
  1171                              <1> 			     ; / using this file
  1172                              <1> sysfork_5: ; 2:
  1173 0000C146 46                  <1>         inc     esi
  1174                              <1> 		; inc r1 / get next open file
  1175 0000C147 6683FE0A            <1>         cmp     si, 10
  1176                              <1> 		; cmp r1,$10. / 10. files is the maximum number which
  1177                              <1> 			  ; / can be opened
  1178 0000C14B 72E2                <1> 	jb	short sysfork_4	
  1179                              <1> 		; blt 1b / check next entry
  1180 0000C14D E968FCFFFF          <1> 	jmp	sysret
  1181                              <1> 		; br sysret1
  1182                              <1> 
  1183                              <1> syscreat: ; < create file >
  1184                              <1> 	; 27/10/2016
  1185                              <1> 	; 25/10/2016, 26/10/2016
  1186                              <1> 	; 15/10/2016, 16/10/2016, 17/10/2016
  1187                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1188                              <1> 	;	     -derived from INT_21H.ASM-
  1189                              <1> 	;            ("loc_INT21h_create_file")
  1190                              <1>         ; 	10/07/2011 (12/03/2011)
  1191                              <1>         ;	INT 21h Function AH = 3Ch
  1192                              <1>         ;	Create File
  1193                              <1>         ;	INPUT
  1194                              <1>         ;	   CX = Attributes
  1195                              <1>         ;          DS:DX= Address of zero terminaned path name
  1196                              <1>         ;
  1197                              <1> 	; 27/12/2015 (Retro UNIX 386 v1.1)
  1198                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1199                              <1> 	; 27/05/2013 (Retro UNIX 8086 v1)
  1200                              <1> 	;
  1201                              <1> 	; 'syscreat' called with two arguments; name and mode.
  1202                              <1> 	; u.namep points to name of the file and mode is put
  1203                              <1> 	; on the stack. 'namei' is called to get i-number of the file.		
  1204                              <1> 	; If the file aready exists, it's mode and owner remain 
  1205                              <1> 	; unchanged, but it is truncated to zero length. If the file
  1206                              <1> 	; did not exist, an i-node is created with the new mode via
  1207                              <1> 	; 'maknod' whether or not the file already existed, it is
  1208                              <1> 	; open for writing. The fsp table is then searched for a free
  1209                              <1> 	; entry. When a free entry is found, proper data is placed
  1210                              <1> 	; in it and the number of this entry is put in the u.fp list.
  1211                              <1> 	; The index to the u.fp (also know as the file descriptor)
  1212                              <1> 	; is put in the user's r0. 			
  1213                              <1> 	;
  1214                              <1> 	; Calling sequence:
  1215                              <1> 	;	syscreate; name; mode
  1216                              <1> 	; Arguments:
  1217                              <1> 	;	name - name of the file to be created
  1218                              <1> 	;	mode - mode of the file to be created
  1219                              <1> 	; Inputs: (arguments)
  1220                              <1> 	; Outputs: *u.r0 - index to u.fp list 
  1221                              <1> 	;		   (the file descriptor of new file)
  1222                              <1> 	; ...............................................................
  1223                              <1> 	;				
  1224                              <1> 	; Retro UNIX 8086 v1 modification: 
  1225                              <1> 	;       'syscreate' system call has two arguments; so,
  1226                              <1> 	;	* 1st argument, name is pointed to by BX register
  1227                              <1> 	;	* 2nd argument, mode is in CX register
  1228                              <1> 	;
  1229                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1230                              <1> 	;	to the user with the file descriptor/number 
  1231                              <1> 	;	(index to u.fp list).
  1232                              <1> 	;
  1233                              <1> 	;call	arg2
  1234                              <1> 	; * name - 'u.namep' points to address of file/path name
  1235                              <1> 	;          in the user's program segment ('u.segmnt')
  1236                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1237                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1238                              <1> 	;          which is on top of stack.
  1239                              <1> 	;
  1240                              <1> 	; TRDOS 386 (10/10/2016)
  1241                              <1> 	;	
  1242                              <1>         ; INPUT ->
  1243                              <1>         ;	   CL = File Attributes
  1244                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1245                              <1> 	;             bit 1 (1) - Hidden file (H)
  1246                              <1>         ;             bit 2 (1) - System file (R)
  1247                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1248                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1249                              <1> 	;	      bit 5 (1) - File has been archived (A)	 	
  1250                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
  1251                              <1> 	;	
  1252                              <1> 	; OUTPUT ->
  1253                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1254                              <1> 	;          cf = 1 -> Error code in AL
  1255                              <1> 	;
  1256                              <1> 	; Modified Registers: EAX (at the return of system call)
  1257                              <1> 	;  
  1258                              <1> 	; Note: If the file is existing and it has not any one
  1259                              <1> 	;	of S,H,R,V,D attributes, it will be truncated 
  1260                              <1> 	;	to zero length; otherwise, access error will be 
  1261                              <1> 	;	returned. 
  1262                              <1> 
  1263                              <1> sysmkdir_0:
  1264 0000C152 F6C108              <1> 	test	cl, 08h ; Volume name 
  1265 0000C155 740A                <1> 	jz	short syscreat_0
  1266                              <1> 
  1267                              <1> 	; Volume name or long name creation
  1268                              <1> 	; is not permitted (in TRDOS 386)!
  1269 0000C157 B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1270 0000C15C E927020000          <1>         jmp	sysopen_dev_err
  1271                              <1> 
  1272                              <1> syscreat_0:
  1273                              <1>         ;mov	[u.namep], ebx
  1274 0000C161 51                  <1> 	push	ecx
  1275 0000C162 89DE                <1> 	mov	esi, ebx
  1276                              <1> 	; file name is forced, change directory as temporary
  1277                              <1> 	;mov	ax, 1
  1278                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1279                              <1> 	;call	set_working_path 
  1280 0000C164 E8152C0000          <1> 	call	set_working_path_x ; 17/10/2016	
  1281 0000C169 0F82D8000000        <1> 	jc	syscreat_err
  1282                              <1> 
  1283                              <1> 	; 16/10/2016
  1284 0000C16F 803D[63410100]00    <1> 	cmp	byte [SWP_inv_fname], 0
  1285 0000C176 776D                <1> 	ja	short  syscreat_inv_fname ; invalid file name !
  1286                              <1> 
  1287                              <1> 	; Here, we have a valid path and also a valid file name
  1288                              <1> 	; (Working dir has been changed if the path
  1289                              <1> 	;  -file name string- had contained a dir name.)
  1290                              <1> 
  1291 0000C178 6631C0              <1> 	xor	ax, ax 
  1292                              <1> 	;mov	esi, FindFile_Name
  1293 0000C17B E883B7FFFF          <1> 	call	find_first_file
  1294 0000C180 59                  <1> 	pop	ecx
  1295                              <1> 		; ESI = Directory Entry (FindFile_DirEntry) Location
  1296                              <1> 		; EDI = Directory Buffer Directory Entry Location
  1297                              <1> 		; EAX = File Size
  1298                              <1> 		;  BL = Attributes of The File/Directory
  1299                              <1> 		;  BH = Long Name Yes/No Status (>0 is YES)
  1300                              <1> 		;  DX > 0 : Ambiguous filename chars are used
  1301 0000C181 726A                <1> 	jc	short syscreat_1 ; file not found (the good!) 
  1302                              <1> 				 ; or another error (the bad') 
  1303                              <1> 
  1304                              <1> 	; (& the uggly!) truncate file to zero length before open
  1305                              <1> 
  1306                              <1> 	;'*' and '?' already checked at 'set_working_path' stage
  1307                              <1> 	;and	dx, dx
  1308                              <1> 	;jnz	short sysmkdir_err ; permission denied 
  1309                              <1> 				   ; invalid filename chars
  1310                              <1> 
  1311                              <1> 	;test	cl, 10h ; subdirectory ?
  1312                              <1> 	;jnz	short sysmkdir_err	
  1313                              <1> 
  1314                              <1> 	; BL = File Attributes:	
  1315                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1316                              <1> 	;             bit 1 (1) - Hidden file (H)
  1317                              <1>         ;             bit 2 (1) - System file (R)
  1318                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1319                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1320                              <1> 	;	      bit 5 (1) - File has been archived	 	
  1321                              <1> 
  1322                              <1> 	; * existing directory must not be truncated
  1323                              <1> 	;   (we don't know it is empty or not, at this stage) 
  1324                              <1> 	; * existing volume name (or a long name) can not be
  1325                              <1> 	;   re-created or truncated by 'syscreat' 	
  1326                              <1> 	; * A file with S, H, R attributes must not be truncated
  1327                              <1> 	;   (change attributes to normal, if you need truncate it)
  1328                              <1> 
  1329 0000C183 F6C31F              <1> 	test	bl, 00011111b  ; check attributes of existing file
  1330 0000C186 754F                <1> 	jnz	short sysmkdir_err
  1331                              <1> 
  1332                              <1> 	;; normal file, OK to continue...
  1333                              <1> 
  1334                              <1> 	; ESI = FindFile_DirEntry
  1335 0000C188 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
  1336 0000C18C 66C1E010            <1> 	shl	ax, 16
  1337 0000C190 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
  1338                              <1> 	; EAX = First cluster to be truncated/unlinked
  1339 0000C194 57                  <1> 	push	edi
  1340 0000C195 51                  <1> 	push	ecx
  1341 0000C196 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1342 0000C19B 29C9                <1> 	sub	ecx, ecx
  1343 0000C19D 8A2D[6E340100]      <1> 	mov	ch, [Current_Drv]
  1344 0000C1A3 01CE                <1> 	add	esi, ecx
  1345                              <1> 	; ESI = Logical dos drive description table address
  1346 0000C1A5 E8B1F8FFFF          <1> 	call	truncate_cluster_chain
  1347 0000C1AA 59                  <1> 	pop	ecx
  1348 0000C1AB 5F                  <1> 	pop	edi
  1349 0000C1AC 7230                <1> 	jc	short syscreate_truncate_err
  1350                              <1> 
  1351                              <1> 	; 26/10/2016
  1352                              <1> 	; EDI = Directory entry address in directory buffer
  1353                              <1> 	; Update directory entry
  1354 0000C1AE E82DDDFFFF          <1> 	call	convert_current_date_time
  1355                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1356                              <1>         ; 	    AX = Time in dos dir entry format	
  1357 0000C1B3 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
  1358 0000C1B7 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
  1359 0000C1BB 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
  1360 0000C1BF 31C0                <1> 	xor	eax, eax ; file size = 0 
  1361 0000C1C1 89471C              <1> 	mov	[edi+DirEntry_FileSize], eax ; 0
  1362 0000C1C4 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; data changed sign	
  1363 0000C1CB BE[643E0100]        <1> 	mov	esi, FindFile_DirEntry
  1364 0000C1D0 B201                <1> 	mov	dl, 1 ; open file for writing
  1365 0000C1D2 E9AA000000          <1> 	jmp	sysopen_2
  1366                              <1> 
  1367                              <1> sysmkdir_err:
  1368                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1369 0000C1D7 B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1370 0000C1DC EB73                <1>         jmp	short sysopen_err
  1371                              <1> 
  1372                              <1> syscreate_truncate_err:
  1373 0000C1DE B812000000          <1> 	mov	eax, ERR_DRV_WRITE ; 18 ; 'disk write error !'
  1374 0000C1E3 EB6C                <1>         jmp	short sysopen_err
  1375                              <1> 
  1376                              <1> syscreat_inv_fname:  ; invalid file name chars 
  1377                              <1> 	; 16/10/2016
  1378 0000C1E5 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26 ; invalid file name chars 
  1379 0000C1EA 59                  <1> 	pop	ecx
  1380 0000C1EB EB64                <1> 	jmp	sysopen_err
  1381                              <1> 
  1382                              <1> syscreat_1:
  1383                              <1> 	; Error code in EAX
  1384 0000C1ED 3C02                <1>         cmp	al, 02h ; 'File not found' error
  1385 0000C1EF 7560                <1>         jne	sysopen_err
  1386                              <1> 
  1387 0000C1F1 F6C110              <1> 	test	cl, 10h ; Directory
  1388 0000C1F4 0F852C020000        <1> 	jnz	sysmkdir_2
  1389                              <1> 
  1390                              <1> syscreat_2:
  1391 0000C1FA BE[543E0100]        <1> 	mov	esi, FindFile_Name 
  1392                              <1>         ;xor	edx, edx
  1393 0000C1FF 31C0                <1>         xor	eax, eax ; File Size  = 0
  1394 0000C201 31DB                <1> 	xor	ebx, ebx
  1395 0000C203 4B                  <1> 	dec 	ebx ; FFFFFFFFh -> create empty file 
  1396                              <1> 	            ;              (only for FAT fs) 
  1397                              <1> 	; CL = File Attributes
  1398 0000C204 E8E0ECFFFF          <1> 	call	create_file
  1399 0000C209 7246                <1> 	jc	sysopen_err
  1400                              <1> 		; EAX = New file's first cluster
  1401                              <1> 		; ESI = Logical Dos Drv Descr. Table Addr.
  1402                              <1> 		; EBX = offset CreateFile_Size
  1403                              <1> 		; ECX = Sectors per cluster (<256) 
  1404                              <1> 		; EDX = Directory entry index/number (<65536)
  1405                              <1> 	; 26/10/2016
  1406                              <1> 	;mov	esi, Directory_Buffer
  1407                              <1> 	;shl	dx, 5 ; *32
  1408                              <1> 	;add	esi, edx
  1409                              <1> 	;; esi = directory entry address in directory buffer
  1410                              <1> 
  1411                              <1> 	; Here, directory entry has been created but last
  1412                              <1> 	; modification date & time of the parent dir has not
  1413                              <1> 	; been updated, yet! 
  1414                              <1> 	; (Note: Directory and FAT buffers have been updated...)
  1415                              <1>  	
  1416 0000C20B E809DEFFFF          <1> 	call	update_parent_dir_lmdt ; now, it is OK too!
  1417                              <1> 
  1418                              <1> 	; 25/10/2016
  1419 0000C210 66B80018            <1> 	mov	ax, 1800h
  1420 0000C214 BE[543E0100]        <1> 	mov	esi, FindFile_Name
  1421 0000C219 E8E5B6FFFF          <1> 	call	find_first_file
  1422 0000C21E 7231                <1> 	jc	short sysopen_err
  1423                              <1> 
  1424                              <1> 	; Only possible error after here is 
  1425                              <1> 	; "too many open files !" error.
  1426                              <1> 	;
  1427                              <1> 	; If "syscreat" will return with that error,
  1428                              <1> 	; (the file has been created but it could not be opened)
  1429                              <1> 	; the user must retry to open this file again
  1430                              <1> 	; or must close another file before using 
  1431                              <1> 	; "sysopen" system call.
  1432                              <1> 
  1433 0000C220 B201                <1> 	mov	dl, 1 ; open file for writing
  1434                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  1435                              <1> 	; EAX = File Size (= 0)
  1436 0000C222 EB5D                <1> 	jmp	short sysopen_2
  1437                              <1> 
  1438                              <1> sysopen: ;<open file>
  1439                              <1> 	; 26/10/2016
  1440                              <1> 	; 24/10/2016
  1441                              <1> 	; 17/10/2016
  1442                              <1> 	; 15/10/2016
  1443                              <1> 	; 06/10/2016, 07/10/2016, 08/10/2016
  1444                              <1> 	; 05/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1445                              <1> 	;	     -derived from INT_21H.ASM-
  1446                              <1> 	;            ("loc_INT21h_open_file")
  1447                              <1>         ; 	26/02/2011 
  1448                              <1>         ;	INT 21h Function AH = 3Dh
  1449                              <1>         ;	Open File
  1450                              <1>         ;	INPUT
  1451                              <1>         ;	   AL= File Access Value
  1452                              <1> 	;     	     0- Open for reading
  1453                              <1> 	;            1- Open for writing
  1454                              <1>         ;            2- Open for reading and writing
  1455                              <1>         ;          DS:DX= Pointer to filename (ASCIIZ)
  1456                              <1>         ;
  1457                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1458                              <1> 	; 22/05/2013 - 27/05/2013 (Retro UNIX 8086 v1)
  1459                              <1> 	;
  1460                              <1> 	; 'sysopen' opens a file in following manner:
  1461                              <1> 	;    1) The second argument in a sysopen says whether to
  1462                              <1> 	;	open the file ro read (0) or write (>0).
  1463                              <1> 	;    2) I-node of the particular file is obtained via 'namei'.
  1464                              <1> 	;    3) The file is opened by 'iopen'.
  1465                              <1> 	;    4) Next housekeeping is performed on the fsp table
  1466                              <1> 	;	and the user's open file list - u.fp.
  1467                              <1> 	;	a) u.fp and fsp are scanned for the next available slot.
  1468                              <1> 	;	b) An entry for the file is created in the fsp table.
  1469                              <1> 	;	c) The number of this entry is put on u.fp list.
  1470                              <1> 	;	d) The file descriptor index to u.fp list is pointed
  1471                              <1> 	;	   to by u.r0.
  1472                              <1> 	;
  1473                              <1> 	; Calling sequence:
  1474                              <1> 	;	sysopen; name; mode
  1475                              <1> 	; Arguments:
  1476                              <1> 	;	name - file name or path name
  1477                              <1> 	;	mode - 0 to open for reading
  1478                              <1> 	;	       1 to open for writing
  1479                              <1> 	; Inputs: (arguments)
  1480                              <1> 	; Outputs: *u.r0 - index to u.fp list (the file descriptor)
  1481                              <1> 	;		  is put into r0's location on the stack.	
  1482                              <1> 	; ...............................................................
  1483                              <1> 	;				
  1484                              <1> 	; Retro UNIX 8086 v1 modification: 
  1485                              <1> 	;       'sysopen' system call has two arguments; so,
  1486                              <1> 	;	* 1st argument, name is pointed to by BX register
  1487                              <1> 	;	* 2nd argument, mode is in CX register
  1488                              <1> 	;
  1489                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1490                              <1> 	;	to the user with the file descriptor/number 
  1491                              <1> 	;	(index to u.fp list).
  1492                              <1> 	;
  1493                              <1> 	;call	arg2
  1494                              <1> 	; * name - 'u.namep' points to address of file/path name
  1495                              <1> 	;          in the user's program segment ('u.segmnt')
  1496                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1497                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1498                              <1> 	;          which is on top of stack.
  1499                              <1> 	;
  1500                              <1> 	; jsr r0,arg2 / get sys args into u.namep and on stack
  1501                              <1> 	;
  1502                              <1>        	; system call registers: ebx, ecx (through 'sysenter')
  1503                              <1> 	;
  1504                              <1> 	; TRDOS 386 (05/10/2016)
  1505                              <1> 	;	
  1506                              <1>         ; INPUT ->
  1507                              <1>         ;	   CL = File Access Value (Open Mode)
  1508                              <1> 	;     	      0 - Open file for reading
  1509                              <1> 	;             1 - Open file for writing
  1510                              <1>         ;             2 - Open device for reading
  1511                              <1> 	;	      3 - Open device for writing
  1512                              <1>         ;          EBX = Pointer to filename/devicename (ASCIIZ)
  1513                              <1> 	; OUTPUT ->
  1514                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1515                              <1> 	;          cf = 1 -> Error code in AL
  1516                              <1> 	;
  1517                              <1> 	; Modified Registers: EAX (at the return of system call)
  1518                              <1> 	;  
  1519                              <1> 
  1520 0000C224 80F901              <1> 	cmp	cl, 1 ; read file (0), write file (1)
  1521 0000C227 7614                <1> 	jna	short sysopen_0
  1522                              <1> 
  1523 0000C229 80F903              <1> 	cmp	cl, 3
  1524 0000C22C 0F8640010000        <1> 	jna	sysopen_device
  1525                              <1> 
  1526                              <1> 	; Invalid access code
  1527 0000C232 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER
  1528 0000C237 0F874B010000        <1> 	ja	sysopen_dev_err
  1529                              <1> 
  1530                              <1> sysopen_0:
  1531                              <1> 	;mov	[u.namep], ebx
  1532 0000C23D 51                  <1> 	push	ecx
  1533 0000C23E 89DE                <1> 	mov	esi, ebx
  1534                              <1> 	; file name is forced, change directory as temporary
  1535                              <1> 	;mov	ax, 1
  1536                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1537                              <1> 	;call	set_working_path 
  1538 0000C240 E8392B0000          <1> 	call	set_working_path_x ; 17/10/2016	
  1539 0000C245 731E                <1> 	jnc	short sysopen_1
  1540                              <1> 
  1541                              <1> syscreat_err: ; ecx = file attributes (for 'syscreat')
  1542 0000C247 59                  <1> 	pop	ecx ; open mode  
  1543 0000C248 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  1544 0000C24A 7505                <1> 	jnz	short sysopen_err
  1545                              <1> 	; eax = 0
  1546 0000C24C B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  1547                              <1> sysopen_err:
  1548 0000C251 A3[E4490100]        <1> 	mov	[u.r0], eax
  1549 0000C256 A3[484A0100]        <1> 	mov	[u.error], eax
  1550 0000C25B E8F32B0000          <1> 	call 	reset_working_path
  1551 0000C260 E935FBFFFF          <1> 	jmp	error
  1552                              <1> 
  1553                              <1> sysopen_1:
  1554                              <1> 	;mov	esi, FindFile_Name
  1555 0000C265 66B80018            <1>         mov	ax, 1800h ; Only files 
  1556 0000C269 E895B6FFFF          <1> 	call	find_first_file
  1557 0000C26E 5A                  <1> 	pop	edx
  1558 0000C26F 72E0                <1> 	jc	short sysopen_err ; eax = 2 (File not found !)
  1559                              <1> 
  1560                              <1> 	; check_open_file_attr_access_code
  1561                              <1> 
  1562 0000C271 F6C307              <1>         test	bl, 7  ; system, hidden, readonly 
  1563 0000C274 740B                <1>         jz	short sysopen_2
  1564                              <1> 
  1565 0000C276 20D2                <1> 	and	dl, dl ; 0 = read mode
  1566 0000C278 7407                <1> 	jz	short sysopen_2
  1567                              <1> 
  1568                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1569 0000C27A B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11  = 'permission denied !'
  1570 0000C27F EBD0                <1>         jmp	short sysopen_err
  1571                              <1> 
  1572                              <1> sysopen_2:
  1573                              <1> 	; esi = Directory Entry (FindFile_DirEntry) Location
  1574 0000C281 89F3                <1> 	mov	ebx, esi
  1575 0000C283 31F6                <1>         xor     esi, esi ; 0
  1576 0000C285 31FF                <1>         xor     edi, edi ; 0
  1577                              <1> sysopen_3: ; scan the list of entries in fsp table
  1578 0000C287 80BE[EA490100]00    <1>         cmp     byte [esi+u.fp], 0
  1579 0000C28E 760F                <1>         jna     short sysopen_4 ; empty slot
  1580 0000C290 6646                <1>         inc     si
  1581 0000C292 6683FE0A            <1>         cmp     si, 10
  1582 0000C296 72EF                <1> 	jb	short sysopen_3
  1583                              <1> toomanyf:
  1584 0000C298 B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1585 0000C29D EBB2                <1> 	jmp	short sysopen_err
  1586                              <1> 
  1587                              <1> sysopen_4: 
  1588 0000C29F 80BF[D2440100]00    <1>         cmp     byte [edi+OF_MODE], 0 ; Scan open files table 
  1589 0000C2A6 760A                <1> 	jna     short sysopen_5
  1590 0000C2A8 6647                <1> 	inc	di
  1591 0000C2AA 6683FF0A            <1> 	cmp     di, OPENFILES ; max. number of open files (=10)
  1592 0000C2AE 72EF                <1> 	jb	short sysopen_4
  1593 0000C2B0 EBE6                <1> 	jmp	short toomanyf
  1594                              <1> 
  1595                              <1> sysopen_5:
  1596 0000C2B2 FEC2                <1> 	inc	dl
  1597 0000C2B4 8897[D2440100]      <1>         mov     [edi+OF_MODE], dl
  1598 0000C2BA 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  1599 0000C2C0 8897[C8440100]      <1>         mov     [edi+OF_DRIVE], dl ; Logical DOS drive number
  1600 0000C2C6 66C1E702            <1> 	shl	di, 2 ; *4 (dword offset)
  1601                              <1> 
  1602 0000C2CA 8987[18450100]      <1> 	mov	[edi+OF_SIZE], eax ; File size in bytes
  1603                              <1> 
  1604 0000C2D0 668B4314            <1>         mov 	ax, [ebx+DirEntry_FstClusHI]
  1605 0000C2D4 C1E010              <1> 	shl	eax, 16
  1606 0000C2D7 668B431A            <1> 	mov 	ax, [ebx+DirEntry_FstClusLO]
  1607 0000C2DB 8987[A0440100]      <1> 	mov     [edi+OF_FCLUSTER], eax ; First cluster
  1608 0000C2E1 8987[B8450100]      <1> 	mov     [edi+OF_CCLUSTER], eax ; Current cluster
  1609                              <1> 
  1610 0000C2E7 31DB                <1>         xor	ebx, ebx
  1611 0000C2E9 899F[F0440100]      <1>         mov     [edi+OF_POINTER], ebx ; offset pointer (0)
  1612 0000C2EF 899F[E0450100]      <1>         mov     [edi+OF_CCINDEX], ebx ; cluster index (0)
  1613                              <1> 
  1614 0000C2F5 A1[843E0100]        <1> 	mov	eax, [FindFile_DirFirstCluster]
  1615 0000C2FA 8987[40450100]      <1> 	mov	[edi+OF_DIRFCLUSTER], eax
  1616                              <1> 
  1617 0000C300 A1[883E0100]        <1> 	mov	eax, [FindFile_DirCluster]
  1618 0000C305 8987[68450100]      <1> 	mov	[edi+OF_DIRCLUSTER], eax
  1619                              <1> 
  1620                              <1> 	; Get (& Save) Volume ID 
  1621                              <1> 	; Important for files of removable drives
  1622                              <1> 	; (In order to check the drive has same volume/disk)
  1623 0000C30B 88D7                <1> 	mov	bh, dl
  1624 0000C30D 81C300010900        <1>         add	ebx, Logical_DOSDisks
  1625 0000C313 8A4303              <1>         mov	al, [ebx+LD_FATType]
  1626 0000C316 3C01                <1>         cmp	al, 1
  1627 0000C318 7209                <1>         jb	short sysopen_6_fs
  1628 0000C31A 3C02                <1>         cmp	al, 2
  1629 0000C31C 770A                <1>         ja	short sysopen_6_fat32
  1630                              <1> sysopen_6_fat:
  1631 0000C31E 8B432D              <1>         mov	eax, [ebx+LD_BPB+VolumeID]
  1632 0000C321 EB08                <1>         jmp	short sysopen_7
  1633                              <1> sysopen_6_fs:
  1634 0000C323 8B4328              <1>         mov	eax, [ebx+LD_FS_VolumeSerial]
  1635 0000C326 EB03                <1>         jmp	short sysopen_7
  1636                              <1> sysopen_6_fat32:
  1637 0000C328 8B4349              <1>         mov	eax, [ebx+LD_BPB+FAT32_VolID]
  1638                              <1> sysopen_7:
  1639 0000C32B A3[64340100]        <1>         mov	[Current_VolSerial], eax
  1640                              <1> 
  1641 0000C330 8987[90450100]      <1> 	mov	[edi+OF_VOLUMEID], eax
  1642                              <1> 
  1643                              <1> 	; 24/10/2016
  1644 0000C336 66D1EF              <1> 	shr	di, 1 ; 4/2, word offset
  1645 0000C339 668B1D[8C3E0100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  1646 0000C340 66899F[08460100]    <1> 	mov	[edi+OF_DIRENTRY], bx
  1647                              <1> 
  1648 0000C347 31D2                <1> 	xor	edx, edx
  1649                              <1> 	;shr	di, 2 ; /4 (byte offset)
  1650 0000C349 66D1EF              <1> 	shr	di, 1 ; 2/2, byte offset
  1651 0000C34C 8897[E6440100]      <1> 	mov	byte [edi+OF_OPENCOUNT], dl ; 0
  1652 0000C352 8897[DC440100]      <1> 	mov	byte [edi+OF_STATUS], dl ; 0
  1653                              <1> 
  1654 0000C358 89FB                <1> 	mov	ebx, edi
  1655 0000C35A FEC3                <1> 	inc	bl
  1656                              <1> 
  1657 0000C35C 889E[EA490100]      <1>         mov     [esi+u.fp], bl ; Open File Entry Number
  1658 0000C362 8935[E4490100]      <1> 	mov     [u.r0], esi ; move index to u.fp list 
  1659                              <1> 			    ; into eax on stack
  1660                              <1> 
  1661 0000C368 E8E62A0000          <1>         call 	reset_working_path
  1662                              <1>         
  1663 0000C36D E948FAFFFF          <1> 	jmp	sysret
  1664                              <1> 
  1665                              <1> 	; (Retro UNIX 386 v1.0)
  1666                              <1> 	; 'fsp' table (10 bytes/entry)
  1667                              <1> 	; bit 15				   bit 0
  1668                              <1> 	; ---|-------------------------------------------
  1669                              <1> 	; r/w|		i-number of open file
  1670                              <1> 	; ---|-------------------------------------------
  1671                              <1> 	;		   device number
  1672                              <1> 	; -----------------------------------------------
  1673                              <1> 	; offset pointer, r/w pointer to file (bit 0-15)
  1674                              <1> 	; -----------------------------------------------
  1675                              <1> 	; offset pointer, r/w pointer to file (bit 16-31)
  1676                              <1> 	; ----------------------|------------------------
  1677                              <1> 	;  flag that says file 	| number of processes
  1678                              <1> 	;   has been deleted	| that have file open 
  1679                              <1> 	; ----------------------|------------------------
  1680                              <1> 
  1681                              <1> sysopen_device:
  1682                              <1> 	; 15/10/2016
  1683                              <1> 	; 08/10/2016
  1684                              <1> 	; 07/10/2016 (TRDOS 386 = TRDOS v2.0)
  1685 0000C372 51                  <1> 	push	ecx ; open mode
  1686 0000C373 89E5                <1> 	mov	ebp, esp
  1687 0000C375 B910000000          <1> 	mov	ecx, 16 ; transfer length = 16 bytes 
  1688 0000C37A 29CC                <1> 	sub	esp, ecx
  1689 0000C37C 89E7                <1> 	mov	edi, esp ; destination address 
  1690 0000C37E 89DE                <1> 	mov 	esi, ebx ; dev name in user's memory space
  1691 0000C380 E8651D0000          <1> 	call	transfer_from_user_buffer
  1692 0000C385 7310                <1> 	jnc	short sysopen_dev_0
  1693                              <1> 	; eax = ERR_OUT_OF_MEMORY = 4 = ERR_MINOR_IM
  1694 0000C387 59                  <1> 	pop	ecx
  1695                              <1> sysopen_dev_err:
  1696 0000C388 A3[E4490100]        <1> 	mov	[u.r0], eax
  1697 0000C38D A3[484A0100]        <1> 	mov	[u.error], eax
  1698 0000C392 E903FAFFFF          <1> 	jmp	error
  1699                              <1> sysopen_dev_0:
  1700 0000C397 89FE                <1> 	mov	esi, edi ; Device name addr (max. 16 bytes, ASCIIZ) 
  1701                              <1> 			 ; for example: "tty, TTY, /dev/tty"
  1702 0000C399 E8292B0000          <1> 	call	get_device_number
  1703 0000C39E 89EC                <1> 	mov	esp, ebp
  1704 0000C3A0 59                  <1> 	pop	ecx
  1705 0000C3A1 7307                <1> 	jnc	short sysopen_dev_1
  1706 0000C3A3 B818000000          <1> 	mov	eax, ERR_INV_DEV_NAME ; 24 ; 'invalid device name !'
  1707 0000C3A8 EBDE                <1> 	jmp	short sysopen_dev_err
  1708                              <1> sysopen_dev_1:
  1709                              <1> 	; eax = Device Number (AL)
  1710                              <1> 	;  cl = Open mode (2 = device read, 3 = device write)
  1711 0000C3AA 31DB                <1>         xor     ebx, ebx ; 0
  1712                              <1> sysopen_dev_2: ; scan the list of entries
  1713 0000C3AC 389B[EA490100]      <1>         cmp     [ebx+u.fp], bl ; 0
  1714 0000C3B2 760E                <1>         jna     short sysopen_dev_3 ; empty slot
  1715 0000C3B4 FEC3                <1>         inc     bl
  1716 0000C3B6 80FB0A              <1>         cmp     bl, 10
  1717 0000C3B9 72F1                <1> 	jb	short sysopen_dev_2
  1718                              <1> 	;
  1719 0000C3BB B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1720 0000C3C0 EBC6                <1> 	jmp	short sysopen_dev_err
  1721                              <1> sysopen_dev_3:
  1722 0000C3C2 891D[E4490100]      <1> 	mov 	[u.r0], ebx ; File/Device index/handle/descriptor
  1723                              <1> 	; eax = device number (entry offset)
  1724 0000C3C8 8AA8[64420100]      <1> 	mov	ch, [eax+DEV_ACCESS] ; bit 0 = accessable by users
  1725                              <1> 				     ; bit 1 = read access perm
  1726                              <1> 				     ; bit 2 = write access perm
  1727                              <1> 				     ; bit 3 = IOCTL permit to users
  1728                              <1> 				     ; bit 4 = block device if set
  1729                              <1> 				     ; bit 5 = 16 bit or 1024 byte
  1730                              <1> 				     ; bit 6 = 32 bit or 2048 byte
  1731                              <1> 				     ; bit 7 = installable device drv
  1732 0000C3CE F6C501              <1> 	test 	ch, 1 ; accessable by normal users (except root)
  1733 0000C3D1 7510                <1> 	jnz	short sysopen_dev_4 ; yes, permission has been given
  1734 0000C3D3 803D[304A0100]00    <1> 	cmp	byte [u.uid], 0 ; root?
  1735 0000C3DA 7607                <1> 	jna	short sysopen_dev_4 ; superuser can open all devices
  1736                              <1> sysopen_dev_perm_err:
  1737 0000C3DC B80B000000          <1> 	mov	eax, ERR_DEV_ACCESS  ; 11  = 'permission denied !'
  1738 0000C3E1 EBA5                <1> 	jmp	short sysopen_dev_err
  1739                              <1> sysopen_dev_4:
  1740 0000C3E3 D0ED                <1> 	shr	ch, 1 ; result: 1 = read, 2 = write, 3 = r & w 
  1741 0000C3E5 FEC9                <1> 	dec	cl  ; result: 1 = read, 2 = write
  1742 0000C3E7 84E9                <1> 	test	cl, ch
  1743 0000C3E9 74F1                <1> 	jz	short sysopen_dev_perm_err 
  1744                              <1> 
  1745 0000C3EB D0E5                <1> 	shl	ch, 1 ; bit 0 = 0
  1746                              <1> 	; eax = device number (entry offset)
  1747 0000C3ED E8F12B0000          <1> 	call	device_open
  1748 0000C3F2 72E8                <1> 	jc	short sysopen_dev_perm_err 
  1749                              <1> 
  1750                              <1> 	; eax = device number (entry offset)
  1751 0000C3F4 0C80                <1> 	or	al, 80h ; set device bit (set bit 7 to 1)
  1752 0000C3F6 8B1D[E4490100]      <1> 	mov	ebx, [u.r0]
  1753 0000C3FC 8883[EA490100]      <1> 	mov	[ebx+u.fp], al	; bit 7 (=1) points to device	
  1754                              <1> 	
  1755 0000C402 E9B3F9FFFF          <1> 	jmp	sysret
  1756                              <1> 
  1757                              <1> sysmkdir: ; < make directory >
  1758                              <1> 	; 15/10/2016
  1759                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1760                              <1> 	;	     -derived from INT_21H.ASM-
  1761                              <1> 	;            ("loc_INT21h_create_file")
  1762                              <1>         ; 	10/07/2011 (12/03/2011)
  1763                              <1>         ;	INT 21h Function AH = 3Ch
  1764                              <1>         ;	Create File
  1765                              <1>         ;	INPUT
  1766                              <1>         ;	   CX = Attributes
  1767                              <1>         ;          DS:DX= Address of zero terminaned path name
  1768                              <1>         ;
  1769                              <1>         ;
  1770                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1771                              <1> 	; 27/05/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  1772                              <1> 	;
  1773                              <1> 	; 'sysmkdir' creates an empty directory whose name is
  1774                              <1> 	; pointed to by arg 1. The mode of the directory is arg 2.	
  1775                              <1> 	; The special entries '.' and '..' are not present.
  1776                              <1> 	; Errors are indicated if the directory already exists or		
  1777                              <1> 	; user is not the super user. 
  1778                              <1> 	;
  1779                              <1> 	; Calling sequence:
  1780                              <1> 	;	sysmkdir; name; mode
  1781                              <1> 	; Arguments:
  1782                              <1> 	;	name - points to the name of the directory
  1783                              <1> 	;	mode - mode of the directory
  1784                              <1> 	; Inputs: (arguments)
  1785                              <1> 	; Outputs: -
  1786                              <1> 	;    (sets 'directory' flag to 1; 
  1787                              <1> 	;    'set user id on execution' and 'executable' flags to 0)
  1788                              <1> 	; ...............................................................
  1789                              <1> 	;				
  1790                              <1> 	; Retro UNIX 8086 v1 modification: 
  1791                              <1> 	;       'sysmkdir' system call has two arguments; so,
  1792                              <1> 	;	* 1st argument, name is pointed to by BX register
  1793                              <1> 	;	* 2nd argument, mode is in CX register
  1794                              <1> 	;
  1795                              <1> 	; TRDOS 386 (10/10/2016)
  1796                              <1> 	;	
  1797                              <1>         ; INPUT ->
  1798                              <1>         ;	   CL = Directory Attributes
  1799                              <1> 	;     	      bit 0 (1) - Read only file/dir (R)
  1800                              <1> 	;             bit 1 (1) - Hidden file/dir (H)
  1801                              <1>         ;             bit 2 (1) - System file/dir (R)
  1802                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1803                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1804                              <1> 	;	      bit 5 (1) - File/Dir has been archived (A)
  1805                              <1> 	;	   CX = 0 -> create normal directory	 	
  1806                              <1>         ;          EBX = Pointer to directory name (ASCIIZ) -path-
  1807                              <1> 	;	
  1808                              <1> 	; OUTPUT ->
  1809                              <1> 	;          eax = First cluster of the new directory
  1810                              <1> 	;          cf = 1 -> Error code in AL
  1811                              <1> 	;
  1812                              <1> 	; Modified Registers: EAX (at the return of system call)
  1813                              <1> 	;  
  1814                              <1> 	; Note: If the file or directory is existing
  1815                              <1> 	;	an access error will be returned. 
  1816                              <1> 
  1817 0000C407 6621C9              <1> 	and	cx, cx ; if cx = 0 -> create a normal subdir
  1818 0000C40A 7413                <1> 	jz	short sysmkdir_1
  1819                              <1> 
  1820 0000C40C F6C110              <1> 	test	cl, 10h ; if dir flags set, also use other flags
  1821 0000C40F 0F853DFDFFFF        <1> 	jnz	sysmkdir_0 ; jump to head of 'syscreat'
  1822                              <1> 
  1823                              <1> 	; CX has wrong flags
  1824 0000C415 B817000000          <1> 	mov 	eax, ERR_INV_FLAGS
  1825 0000C41A E969FFFFFF          <1> 	jmp	sysopen_dev_err
  1826                              <1> 
  1827                              <1> sysmkdir_1:
  1828 0000C41F B110                <1> 	mov	cl, 10h ; set subdir flag and reset other flags
  1829 0000C421 E92CFDFFFF          <1> 	jmp	sysmkdir_0 ; jump to head of 'syscreat'
  1830                              <1> sysmkdir_2: 
  1831                              <1> 	; jump from 'syscreat' ; from 'syscreat_1'
  1832                              <1> 	;  CL = Directory attributes/flags  
  1833 0000C426 BE[543E0100]        <1> 	mov	esi, FindFile_Name 
  1834 0000C42B E8E9D7FFFF          <1> 	call	make_sub_directory
  1835 0000C430 0F821BFEFFFF        <1> 	jc	sysopen_err       ; NOTE: Old type (TRDOS 8086)
  1836                              <1> 				  ; error codes must be modified
  1837                              <1> 				  ; for next TRDOS 386 versions
  1838                              <1> 				  ; (10/10/2016)
  1839                              <1> 				  ; Old (MSDOS type)
  1840                              <1> 				  ; error codes (2011):
  1841                              <1> 				  ;  2 = file not found
  1842                              <1> 				  ;  3 = directory not found
  1843                              <1> 				  ;  5 = access denied
  1844                              <1> 				  ; 12 = no more files
  1845                              <1> 			          ; 19 = disk write protected   
  1846                              <1> 				  ; 39 = insufficient disk space
  1847                              <1> 				  ; 'sysdefs.s' ; 10/10/2016  	
  1848                              <1> 	
  1849 0000C436 A3[E4490100]        <1> 	mov	[u.r0], eax ; New sub dir's first cluster
  1850                              <1> 
  1851 0000C43B E8132A0000          <1>         call 	reset_working_path
  1852                              <1> 
  1853 0000C440 E975F9FFFF          <1> 	jmp	sysret	
  1854                              <1> 
  1855                              <1> sysclose: ;<close file>
  1856                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1857                              <1> 	;
  1858                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1859                              <1> 	; 22/05/2013 - 26/05/2013 (Retro UNIX 8086 v1)
  1860                              <1> 	;
  1861                              <1> 	; 'sysclose', given a file descriptor in 'u.r0', closes the
  1862                              <1> 	; associated file. The file descriptor (index to 'u.fp' list)
  1863                              <1> 	; is put in r1 and 'fclose' is called.
  1864                              <1> 	;
  1865                              <1> 	; Calling sequence:
  1866                              <1> 	;	sysclose
  1867                              <1> 	; Arguments:
  1868                              <1> 	;	-  
  1869                              <1> 	; Inputs: *u.r0 - file descriptor
  1870                              <1> 	; Outputs: -
  1871                              <1> 	; ...............................................................
  1872                              <1> 	;				
  1873                              <1> 	; Retro UNIX 8086 v1 modification:
  1874                              <1> 	;	 The user/application program puts file descriptor
  1875                              <1> 	;        in BX register as 'sysclose' system call argument.
  1876                              <1> 	; 	 (argument transfer method 1)
  1877                              <1> 
  1878                              <1> 	; TRDOS 386 (06/10/2016)
  1879                              <1> 	;	
  1880                              <1>         ; INPUT ->
  1881                              <1>         ;	   EBX = File Handle/Number (file index) (AL)
  1882                              <1> 	; OUTPUT ->
  1883                              <1> 	;          cf = 0 -> EAX = 0
  1884                              <1> 	;          cf = 1 -> Error code in EAX (ERR_FILE_NOT_OPEN)
  1885                              <1> 	;
  1886                              <1> 	; Modified Registers: EAX (at the return of system call)
  1887                              <1> 	;  
  1888                              <1> 
  1889 0000C445 89D8                <1> 	mov 	eax, ebx
  1890 0000C447 31DB                <1> 	xor	ebx, ebx	
  1891 0000C449 891D[E4490100]      <1> 	mov	[u.r0], ebx ; 0  ; return value of EAX
  1892 0000C44F E89D0E0000          <1> 	call 	fclose
  1893 0000C454 0F8360F9FFFF        <1> 	jnc	sysret
  1894 0000C45A B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  1895 0000C45F A3[484A0100]        <1> 	mov	[u.error], eax ;
  1896 0000C464 A3[E4490100]        <1> 	mov	[u.r0], eax ; ! invalid handle !
  1897 0000C469 E92CF9FFFF          <1> 	jmp	error
  1898                              <1> 
  1899                              <1> sysread: ; < read from file >
  1900                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1901                              <1> 	;	     -derived from INT_21H.ASM-
  1902                              <1> 	;            ("loc_INT21h_read_file")
  1903                              <1>         ; 	13/03/2011 (05/03/2011)
  1904                              <1>         ;	INT 21h Function AH = 3Fh
  1905                              <1>         ;	Read from a File
  1906                              <1>         ;	INPUT
  1907                              <1> 	;	   BX = File Handle
  1908                              <1>         ;	   CX = Number of bytes to read
  1909                              <1>         ;          DS:DX= Buffer address
  1910                              <1>         ;
  1911                              <1> 	; Note: TRDOS 386 'sysread' has been derived from 
  1912                              <1> 	;	Retro UNIX 386 v1 'sysread', except a few 
  1913                              <1> 	;	code modifications.
  1914                              <1> 	;
  1915                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  1916                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  1917                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  1918                              <1> 	;
  1919                              <1> 	; 'sysread' is given a buffer to read into and the number of
  1920                              <1> 	; characters to be read. If finds the file from the file
  1921                              <1> 	; descriptor located in *u.r0 (r0). This file descriptor
  1922                              <1> 	; is returned from a successful open call (sysopen).
  1923                              <1> 	; The i-number of file is obtained via 'rw1' and the data
  1924                              <1> 	; is read into core via 'readi'.
  1925                              <1> 	;
  1926                              <1> 	; Calling sequence:
  1927                              <1> 	;	sysread; buffer; nchars
  1928                              <1> 	; Arguments:
  1929                              <1> 	;	buffer - location of contiguous bytes where 
  1930                              <1> 	;		 input will be placed.
  1931                              <1> 	;	nchars - number of bytes or characters to be read.
  1932                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  1933                              <1> 	; Outputs: *u.r0 - number of bytes read.	
  1934                              <1> 	; ...............................................................
  1935                              <1> 	;				
  1936                              <1> 	; Retro UNIX 8086 v1 modification: 
  1937                              <1> 	;       'sysread' system call has three arguments; so,
  1938                              <1> 	;	* 1st argument, file descriptor is in BX register
  1939                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  1940                              <1> 	;	* 3rd argument, number of bytes is in DX register
  1941                              <1> 	;
  1942                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1943                              <1> 	;	to the user with number of bytes read. 
  1944                              <1> 	;
  1945                              <1> 	; TRDOS 386 (05/10/2016)
  1946                              <1> 	;	
  1947                              <1>         ; INPUT ->
  1948                              <1>         ;	   EBX = File handle (descriptor/index)
  1949                              <1> 	;	   ECX = Buffer address		
  1950                              <1>         ;          EDX = Number of bytes
  1951                              <1> 	; OUTPUT ->
  1952                              <1> 	;          EAX = Number of bytes have been read
  1953                              <1> 	;          cf = 1 -> Error code in AL
  1954                              <1> 	;
  1955                              <1> 	; Modified Registers: EAX (at the return of system call)
  1956                              <1> 	; 
  1957                              <1> 
  1958                              <1> 	; EBX = File descriptor
  1959 0000C46E E8CC0E0000          <1> 	call	getf1 
  1960 0000C473 7277                <1> 	jc	short device_read ; read data from device
  1961                              <1> 	; EAX = First cluster of the file
  1962                              <1> 
  1963 0000C475 E83F000000          <1> 	call	rw1
  1964 0000C47A 730A                <1> 	jnc	short sysread_0
  1965                              <1> 
  1966 0000C47C A3[E4490100]        <1> 	mov	[u.r0], eax ; error code
  1967 0000C481 E914F9FFFF          <1> 	jmp	error
  1968                              <1> 	 
  1969                              <1> sysread_0:
  1970 0000C486 E85A170000          <1> 	call	readi
  1971 0000C48B EB1D                <1> 	jmp	short rw0
  1972                              <1> 
  1973                              <1> syswrite: ; < write to file >
  1974                              <1> 	; 23/10/2016
  1975                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1976                              <1> 	;	     -derived from INT_21H.ASM-
  1977                              <1> 	;            ("loc_INT21h_write_file")
  1978                              <1>         ; 	13/03/2011 (05/03/2011)
  1979                              <1>         ;	INT 21h Function AH = 40h
  1980                              <1>         ;	Write to a File
  1981                              <1>         ;	INPUT
  1982                              <1> 	;	   BX = File Handle
  1983                              <1>         ;	   CX = Number of bytes to write
  1984                              <1>         ;          DS:DX= Buffer address
  1985                              <1>         ;
  1986                              <1> 	; Note: TRDOS 386 'sysrwrite' has been derived from 
  1987                              <1> 	;	Retro UNIX 386 v1 'syswrite', except a few 
  1988                              <1> 	;	code modifications.
  1989                              <1> 	;
  1990                              <1> 
  1991                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  1992                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  1993                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  1994                              <1> 	;
  1995                              <1> 	; 'syswrite' is given a buffer to write onto an output file
  1996                              <1> 	; and the number of characters to write. If finds the file
  1997                              <1> 	; from the file descriptor located in *u.r0 (r0). This file 
  1998                              <1> 	; descriptor is returned from a successful open or create call
  1999                              <1> 	; (sysopen or syscreat). The i-number of file is obtained via
  2000                              <1> 	; 'rw1' and buffer is written on the output file via 'write'.
  2001                              <1> 	;
  2002                              <1> 	; Calling sequence:
  2003                              <1> 	;	syswrite; buffer; nchars
  2004                              <1> 	; Arguments:
  2005                              <1> 	;	buffer - location of contiguous bytes to be writtten.
  2006                              <1> 	;	nchars - number of characters to be written.
  2007                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  2008                              <1> 	; Outputs: *u.r0 - number of bytes written.	
  2009                              <1> 	; ...............................................................
  2010                              <1> 	;				
  2011                              <1> 	; Retro UNIX 8086 v1 modification: 
  2012                              <1> 	;       'syswrite' system call has three arguments; so,
  2013                              <1> 	;	* 1st argument, file descriptor is in BX register
  2014                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  2015                              <1> 	;	* 3rd argument, number of bytes is in DX register
  2016                              <1> 	;
  2017                              <1> 	;	AX register (will be restored via 'u.r0') will return
  2018                              <1> 	;	to the user with number of bytes written. 
  2019                              <1> 	;
  2020                              <1> 	; INPUT ->
  2021                              <1>         ;	   EBX = File handle (descriptor/index)
  2022                              <1> 	;	   ECX = Buffer address		
  2023                              <1>         ;          EDX = Number of bytes
  2024                              <1> 	; OUTPUT ->
  2025                              <1> 	;          EAX = Number of bytes have been written
  2026                              <1> 	;          cf = 1 -> Error code in AL
  2027                              <1> 	;
  2028                              <1> 	; Modified Registers: EAX (at the return of system call)
  2029                              <1> 	;  
  2030                              <1> 
  2031                              <1> 	; EBX = File descriptor
  2032 0000C48D E8AD0E0000          <1> 	call	getf1 
  2033 0000C492 7274                <1> 	jc	short device_write ; write data to device
  2034                              <1> 	; EAX = First cluster of the file
  2035                              <1> 	; EBX = File number  (Open file number) ; 23/10/2016
  2036                              <1> 
  2037 0000C494 E820000000          <1> 	call	rw1
  2038 0000C499 730A                <1> 	jnc	short syswrite_0
  2039 0000C49B A3[E4490100]        <1> 	mov	[u.r0], eax ; error code
  2040 0000C4A0 E9F5F8FFFF          <1> 	jmp	error
  2041                              <1> 	 
  2042                              <1> syswrite_0:
  2043 0000C4A5 E8581E0000          <1> 	call	writei
  2044                              <1> rw0: ; 1:
  2045 0000C4AA A1[0C4A0100]        <1>         mov	eax, [u.nread]
  2046 0000C4AF A3[E4490100]        <1> 	mov	[u.r0], eax
  2047 0000C4B4 E901F9FFFF          <1> 	jmp	sysret
  2048                              <1> 
  2049                              <1> rw1:	
  2050                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2051                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2052                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2053                              <1> 	; 23/05/2013 - 24/05/2013 (Retro UNIX 8086 v1)
  2054                              <1> 	; System call registers: ebx, ecx, edx (through 'sysenter')
  2055                              <1> 	;
  2056                              <1> 	; EBX = File descriptor
  2057                              <1> 	;call	getf1 ; calling point in 'getf' from 'rw1'
  2058                              <1> 	;jc	short device_rw ; read/write data from/to device
  2059                              <1> 	; EAX = First cluster of the file
  2060                              <1> 
  2061 0000C4B9 83F802              <1> 	cmp 	eax, 2
  2062 0000C4BC 7217                <1> 	jb	short rw2
  2063                              <1> 	;
  2064 0000C4BE 890D[044A0100]      <1> 	mov	[u.base], ecx 	; buffer address/offset 
  2065                              <1> 				;(in the user's virtual memory space)
  2066 0000C4C4 8915[084A0100]      <1> 	mov	[u.count], edx 
  2067                              <1> 
  2068 0000C4CA C705[484A0100]0000- <1>         mov     dword [u.error], 0 ; reset the last error code
  2068 0000C4D2 0000                <1>
  2069 0000C4D4 C3                  <1> 	retn
  2070                              <1> 
  2071                              <1> rw2:
  2072 0000C4D5 B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  2073 0000C4DA A3[484A0100]        <1> 	mov	dword [u.error], eax
  2074 0000C4DF C3                  <1> 	retn
  2075                              <1> rw3: 
  2076 0000C4E0 B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS ; permission denied !
  2077 0000C4E5 A3[484A0100]        <1> 	mov	dword [u.error], eax
  2078 0000C4EA F9                  <1> 	stc
  2079 0000C4EB C3                  <1> 	retn
  2080                              <1> 
  2081                              <1> device_read:
  2082                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2083                              <1> 	; cl = DEV_OPENMODE ; open mode
  2084                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2085                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2086                              <1> 
  2087 0000C4EC F6C101              <1> 	test	cl, 1 ; 1 = read, 2 = write, 3 = read&write
  2088 0000C4EF 74EF                <1> 	jz	short rw3
  2089                              <1> 
  2090 0000C4F1 89C3                <1> 	mov	ebx, eax
  2091 0000C4F3 66C1E302            <1> 	shl	bx, 2 ; *4
  2092                              <1> 
  2093 0000C4F7 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2094 0000C4FA 7406                <1> 	jz	short d_read_2 ; Kernel device
  2095                              <1> 	; installable device
  2096                              <1> d_read_1:
  2097 0000C4FC FFA3[20420100]      <1>         jmp	dword [ebx+IDEV_RADDR-4]
  2098                              <1> d_read_2:
  2099 0000C502 FFA3[92F80000]      <1> 	jmp	dword [ebx+KDEV_RADDR-4]
  2100                              <1> 
  2101                              <1> device_write:
  2102                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2103                              <1> 	; cl = DEV_OPENMODE ; open mode
  2104                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2105                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2106                              <1> 
  2107 0000C508 F6C102              <1> 	test	cl, 2 ; 1 = read, 2 = write, 3 = read&write
  2108 0000C50B 74D3                <1> 	jz	short rw3	
  2109                              <1> 
  2110 0000C50D 89C3                <1> 	mov	ebx, eax
  2111 0000C50F 66C1E302            <1> 	shl	bx, 2 ; *4
  2112                              <1> 
  2113 0000C513 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2114 0000C516 7406                <1> 	jz	short d_write_2 ; Kernel device
  2115                              <1> 	; installable device
  2116                              <1> d_write_1:
  2117 0000C518 FFA3[40420100]      <1>         jmp	dword [ebx+IDEV_WADDR-4]
  2118                              <1> d_write_2:
  2119 0000C51E FFA3[E2F80000]      <1> 	jmp	dword [ebx+KDEV_WADDR-4]
  2120                              <1> 
  2121                              <1> 
  2122                              <1> sysemt: ; enable (or disable) multi tasking -time sharing-
  2123                              <1> 	;
  2124                              <1> 	; 23/05/2016 - TRDOS 386 (TRDOS v2.0)
  2125                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2126                              <1> 	; 10/12/2013 - 20/04/2014 (Retro UNIX 8086 v1)
  2127                              <1> 	;
  2128                              <1> 	; Retro UNIX 8086 v1 modification: 
  2129                              <1> 	;	'Enable Multi Tasking'  system call instead 
  2130                              <1> 	;	of 'Emulator Trap' in original UNIX v1 for PDP-11.
  2131                              <1> 	;
  2132                              <1> 	; Retro UNIX 8086 v1 feature only!
  2133                              <1> 	;	Using purpose: Kernel will start without time-out
  2134                              <1> 	;	(internal clock/timer) functionality.
  2135                              <1> 	;	Then etc/init will enable clock/timer for
  2136                              <1> 	;	multi tasking. 
  2137                              <1> 	;
  2138                              <1> 	; INPUT ->
  2139                              <1> 	;	BL = 0 -> disable multi tasking
  2140                              <1> 	;	BL > 1 -> enable multi tasking (time sharing) 
  2141                              <1> 	; OUTPUT ->
  2142                              <1> 	;	none	
  2143                              <1> 	;
  2144                              <1> 	;  Note: Multi tasking is disabled during system
  2145                              <1> 	;	 initialization, it must be enabled by using
  2146                              <1> 	;	 this system call. (Otherwise, running proces 
  2147                              <1> 	;	 will not be changed by another process within
  2148                              <1> 	;	 run time sequence/schedule, if running process
  2149                              <1> 	;	 will not 'release' itself. Only 'wakeup' procedure
  2150                              <1> 	;	 for waiting processes and programmed timer events
  2151                              <1> 	;	 for other processes can change running process 
  2152                              <1> 	;	 while multi tasking is disabled.) ** 23/05/2016 **
  2153                              <1> 
  2154 0000C524 803D[304A0100]00    <1> 	cmp	byte [u.uid], 0 ; root ?
  2155                              <1> 	;ja	error
  2156 0000C52B 0F8726F9FFFF        <1> 	ja	badsys ; 14/05/2015
  2157                              <1> 	;
  2158 0000C531 FA                  <1> 	cli
  2159 0000C532 881D[3E410100]      <1> 	mov	[multi_tasking], bl ; 0 to disable, >0 to enable
  2160 0000C538 E97DF8FFFF          <1> 	jmp	sysret
  2161                              <1> 
  2162                              <1> systimer:
  2163                              <1> 	; 02/01/2017
  2164                              <1> 	; 21/12/2016
  2165                              <1> 	; 19/12/2016
  2166                              <1> 	; 10/12/2016 (callback)
  2167                              <1> 	; 10/06/2016
  2168                              <1> 	; 07/06/2016
  2169                              <1> 	; 06/06/2016
  2170                              <1> 	; 21/05/2016
  2171                              <1> 	; 19/05/2016
  2172                              <1> 	; 18/05/2016 - TRDOS 386 (TRDOS v2.0)
  2173                              <1> 	; (TRDOS 386 feature only!)
  2174                              <1> 	;
  2175                              <1> 	; (start or stop timer event(s))	
  2176                              <1> 	;
  2177                              <1> 	; INPUT ->
  2178                              <1> 	;	BL = Signal return byte (response byte)
  2179                              <1> 	;	     (Any requested value between 0 and 255)
  2180                              <1> 	;	     (Kernel will put it at the requested address)    	
  2181                              <1> 	;	BH = Time count unit
  2182                              <1> 	;	     0 = Stop timer event
  2183                              <1> 	;	     1 = 18.2 ticks per second
  2184                              <1> 	;	     2 = 10 milliseconds  		
  2185                              <1> 	;	     3 = 1 second (for real time clock interrupt) 	 
  2186                              <1> 	;	     4 = time/tick count in current time count unit
  2187                              <1> 	;	    // 10/12/2016			
  2188                              <1> 	;	    80h = Stop timer event (callback method)
  2189                              <1> 	;	    81h = 18.2 ticks per second, callback method
  2190                              <1> 	;	    82h = 10 milliseconds, callback method 	
  2191                              <1> 	;	    83h = 1 second (for RTC int), callback method 	
  2192                              <1> 	;	    84h = current time count unit, callback method
  2193                              <1> 	;
  2194                              <1> 	;	    Note: Only 03h or 83h will set real time clock
  2195                              <1> 	;		  (RTC) events (Others are for PIT events)! 	
  2196                              <1> 	;	
  2197                              <1> 	;	NOTE: If callback (user service) method is used,
  2198                              <1> 	;	    EDX will point to the return address (of service
  2199                              <1> 	;	    procedure) in user's space instead of signal 
  2200                              <1> 	;	    response byte address. (TRDOS 386 kernel will
  2201                              <1> 	;	    direct the cpu to that address -in user's space-
  2202                              <1> 	;	    at the return of system call or interrupt 
  2203                              <1> 	;	    just after the adjusted count/time is elapsed.)
  2204                              <1> 	;	    User's sevice routine must be ended with a
  2205                              <1> 	;	    'iret'. Normal return addresses from system 
  2206                              <1> 	;	    calls or and interrupts will be kept same except
  2207                              <1> 	;	    the timer returns. 			
  2208                              <1>      	;
  2209                              <1> 	;	BH = 0 -> Stop timer event
  2210                              <1> 	;	BL = Timer event number (1 to 255) if BH = 0     	
  2211                              <1> 	;	     If BL = 0, all timer events (which are belongs
  2212                              <1> 	;	      to running process) will be stopped 		    
  2213                              <1> 	;	ECX = Time/Tick count (depending on time count unit)
  2214                              <1> 	;	EDX = Signal return (Response) byte address
  2215                              <1> 	;	      (virtual address in user's memory space)
  2216                              <1> 	; OUTPUT ->
  2217                              <1> 	;	AL = Timer event number	(1 to 255) (max. value = 16)
  2218                              <1> 	;	IF BH Input = 0 & CF = 0 & AL = 0 -> 
  2219                              <1> 	;	     timer event(s) has/have been stopped/finished
  2220                              <1> 	;	CF = 1 & AL = 0 -> no timer setting space to set
  2221                              <1> 	;	CF = 1 & AL > 0 -> timer count unit is not usable
  2222                              <1> 	;
  2223                              <1> 	;	NOTE: To modify a time count for a user function,
  2224                              <1> 	;	      at first, current timer event must be stopped
  2225                              <1> 	;	      then a new timer event (which is related with
  2226                              <1> 	;	      same user function) must be started.
  2227                              <1> 	;		
  2228                              <1> 	;	      Signal return (response) byte may be used for 
  2229                              <1> 	;	      several purposes. Kernel will put this value 
  2230                              <1> 	;	      to requested address during timer interrupt,
  2231                              <1> 	;	      program/user can check this value to understand
  2232                              <1> 	;	      which event has been occurred and what is changed.
  2233                              <1> 	;	      (Multi timer events can share same signal address)
  2234                              <1> 	;	
  2235                              <1> 	;	NOTE: If the process is running while the time count
  2236                              <1> 	;	      is reached, kernel will put signal return (response)
  2237                              <1> 	;	      byte value at requested address during timer
  2238                              <1> 	;	      interrupt and the process will continue to run.
  2239                              <1> 	;	      Program/process must call (jump to) it's timer event
  2240                              <1> 	;	      function as required, for checking the timer event
  2241                              <1> 	;	      status via signal return (response) byte address. 
  2242                              <1> 	;
  2243                              <1> 	;	      If the process is not running (waiting or sleeping
  2244                              <1> 	;	      or released) while the time count is reached,
  2245                              <1> 	;	      it is restarted from where it left, to ensure
  2246                              <1> 	;	      proper multi media (video, audio, clock, timer)
  2247                              <1> 	;	      functionality.
  2248                              <1> 	;
  2249                              <1> 	;	      (It is better to use 'syswait' or 'syssleep',
  2250                              <1> 	;	      or 'sysrele' system call just after the timer
  2251                              <1> 	;	      function. Otherwise, timer events may block other
  2252                              <1> 	;	      processes which are not using timer events.)  	 		 			 		 	
  2253                              <1> 	;	     	      		 			
  2254                              <1> 	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  2255                              <1> 	;       Owner:	        resb 1 ; 0 = free
  2256                              <1> 	;		  	       ;>0 = process number (u.uno)
  2257                              <1> 	;	Calback:	resb 1 ; 1 = callback, 0 = response byte
  2258                              <1> 	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  2259                              <1> 	;		   	       ; 1 = Real Time Clock interrupt 
  2260                              <1> 	;	Response:       resb 1 ; 0 to 255, signal return value
  2261                              <1> 	;	Count Limit:	resd 1 ; count of ticks (total/set)
  2262                              <1> 	;	Current Count: 	resd 1 ; count of ticks (current)
  2263                              <1> 	;	Response Addr:  resd 1 ; response byte (pointer) address
  2264                              <1> 	;
  2265                              <1> 
  2266                              <1> 	; 19/12/2016 (timer callback)
  2267 0000C53D C605[7C460100]00    <1> 	mov	byte [tcallback], 0 
  2268 0000C544 C605[7D460100]00    <1> 	mov	byte [trtc], 0
  2269 0000C54B C705[504A0100]0000- <1> 	mov	dword [u.tcb], 0 ; this is not necessary...
  2269 0000C553 0000                <1>
  2270                              <1> 
  2271 0000C555 80FF80              <1> 	cmp	bh, 80h
  2272 0000C558 7225                <1> 	jb	short systimer_cb2
  2273 0000C55A 7704                <1> 	ja	short systimer_cb0
  2274                              <1> 
  2275 0000C55C 31D2                <1> 	xor	edx, edx ; 0, reset callback address
  2276 0000C55E EB0B                <1> 	jmp	short systimer_cb1
  2277                              <1> 
  2278                              <1> systimer_cb0:
  2279 0000C560 80FF84              <1> 	cmp	bh, 84h	
  2280 0000C563 7764                <1> 	ja	short systimer_5 ;  undefined, error
  2281                              <1> 
  2282                              <1> 	;mov	byte [tcallback], 1 ; 19/12/2016
  2283 0000C565 FE05[7C460100]      <1> 	inc	byte [tcallback]
  2284                              <1> 
  2285                              <1> systimer_cb1:
  2286 0000C56B 0FB635[334A0100]    <1> 	movzx	esi, byte [u.uno] ; process number
  2287 0000C572 66C1E602            <1> 	shl	si, 2	
  2288 0000C576 8996[8C470100]      <1> 	mov	[esi+p.tcb-4], edx ; set process timer callback address
  2289                              <1> 				   ; (overwrite prev value if it is set!)
  2290 0000C57C 80E77F              <1> 	and	bh, 7Fh
  2291                              <1> 
  2292                              <1> systimer_cb2:
  2293 0000C57F 80FF02              <1> 	cmp	bh, 2
  2294 0000C582 7445                <1>         je      short systimer_5  ; only 18.2 ticks per second is usable
  2295                              <1> 				  ; 10 milliseconds (100 Hertz) timer 
  2296                              <1> 				  ; will be set later (18/05/2016)
  2297 0000C584 774B                <1>         ja      short systimer_6 
  2298                              <1> 
  2299 0000C586 20FF                <1> 	and	bh, bh
  2300 0000C588 0F84BA000000        <1>         jz      systimer_9        ; stop timer event(s)
  2301                              <1> 
  2302                              <1> 	; bh = 1 (timer interrupt, 18.2 Hz, IBM PC/AT ROMBIOS default)
  2303                              <1> 
  2304                              <1> systimer_19:
  2305 0000C58E B00A                <1> 	mov	al, 10 ; (*)
  2306                              <1> 
  2307                              <1> systimer_0:
  2308 0000C590 B710                <1> 	mov	bh, 16
  2309                              <1> 	;
  2310 0000C592 383D[3F410100]      <1> 	cmp	[timer_events], bh ; 16 ; 07/06/2016
  2311 0000C598 7319                <1> 	jnb 	short systimer_3  ; max. 16 timer events
  2312                              <1> 	;
  2313 0000C59A 50                  <1> 	push	eax ; (*)
  2314                              <1> 
  2315 0000C59B BF[7C4A0100]        <1> 	mov	edi, timer_set  ; beginning address of timer events
  2316                              <1> 				; setting space
  2317 0000C5A0 30C0                <1> 	xor	al, al ; 0
  2318                              <1> systimer_1:
  2319 0000C5A2 FEC0                <1> 	inc	al
  2320 0000C5A4 803F00              <1> 	cmp	byte [edi], 0 	; is it free space ?
  2321 0000C5A7 7639                <1> 	jna	short systimer_7 ; yes
  2322 0000C5A9 FECF                <1> 	dec	bh
  2323 0000C5AB 7405                <1> 	jz	short systimer_2
  2324 0000C5AD 83C710              <1> 	add	edi, 16
  2325 0000C5B0 EBF0                <1> 	jmp	short  systimer_1 ; next event space
  2326                              <1> 
  2327                              <1> systimer_2:
  2328 0000C5B2 58                  <1> 	pop	eax ; (*) discard
  2329                              <1> systimer_3:
  2330 0000C5B3 C605[E4490100]00    <1> 	mov	byte [u.r0], 0
  2331                              <1> systimer_4:
  2332 0000C5BA C705[484A0100]1B00- <1>         mov     dword [u.error], ERR_MISC
  2332 0000C5C2 0000                <1>
  2333                              <1>                                 ; one of miscellaneous/other errors
  2334 0000C5C4 E9D1F7FFFF          <1> 	jmp	error ; cf -> 1
  2335                              <1> 
  2336                              <1> systimer_5:
  2337 0000C5C9 883D[E4490100]      <1> 	mov	[u.r0], bh ; Time count unit (=2 or >3)
  2338 0000C5CF EBE9                <1> 	jmp	short systimer_4 ; 07/06/2016
  2339                              <1> 
  2340                              <1> systimer_6:
  2341 0000C5D1 80FF04              <1> 	cmp	bh, 4
  2342 0000C5D4 77F3                <1>         ja      short systimer_5  ; undefined time count unit
  2343                              <1> 	;jb	short systimer_16	
  2344                              <1> 
  2345                              <1> 	;mov	al, 1	; default (use current timer unit)
  2346                              <1> 			; countdown value is in ECX ! 
  2347                              <1> 			; max. value of ecx = 4294967296/10
  2348                              <1>         ;jmp    short systimer_0
  2349                              <1> 	;jmp	short systimer_19	
  2350 0000C5D6 74B6                <1> 	je	short systimer_19
  2351                              <1> 
  2352                              <1> systimer_16:
  2353                              <1> 	; bh = 3
  2354                              <1> 	; timer event via real time clock interrupt
  2355                              <1> 	; interrupt/update frequency: 1 Hz (1 tick per second)
  2356                              <1> 	
  2357 0000C5D8 B0B6                <1> 	mov	al, 182 ; (*) ; 18.2 * 10
  2358 0000C5DA FE05[7D460100]      <1> 	inc	byte [trtc] ; timer event via real time clock
  2359 0000C5E0 EBAE                <1>         jmp     short systimer_0
  2360                              <1> 
  2361                              <1> systimer_7:
  2362 0000C5E2 A2[E4490100]        <1> 	mov	[u.r0], al ; timer event number
  2363                              <1> 	;
  2364                              <1> 	; edi = address of empty timer event area
  2365 0000C5E7 A0[334A0100]        <1> 	mov	al, [u.uno]
  2366 0000C5EC FA                  <1> 	cli 	; disable interrupts 
  2367 0000C5ED AA                  <1> 	stosb	; process number
  2368 0000C5EE A0[7C460100]        <1> 	mov	al, [tcallback] ; timer callback flag
  2369 0000C5F3 AA                  <1> 	stosb 	; 1= callback method, 0= signal response byte method
  2370 0000C5F4 A0[7D460100]        <1> 	mov	al, [trtc] ; timer interrupt type
  2371 0000C5F9 AA                  <1> 	stosb	; 1= real time clock, 0= programmable interval timer
  2372 0000C5FA 88D8                <1> 	mov	al, bl ; Signal return (Response) value
  2373 0000C5FC AA                  <1> 	stosb   ; response byte
  2374 0000C5FD 58                  <1> 	pop	eax ; (*) ; 10 or 182
  2375 0000C5FE 89D3                <1> 	mov	ebx, edx ; virtual address for response/signal byte
  2376 0000C600 F7E1                <1> 	mul	ecx
  2377                              <1> 	; (eax = 10 * count of 18.2 Hz timer ticks)
  2378                              <1> 	; (count down step = 10)
  2379 0000C602 AB                  <1> 	stosd  ; count limit (reset value)
  2380 0000C603 AB                  <1> 	stosd  ; current count value
  2381                              <1> 
  2382                              <1> 	; 19/12/2016
  2383 0000C604 803D[7C460100]00    <1> 	cmp	byte [tcallback], 0 ; timer callback method ?
  2384 0000C60B 7604                <1> 	jna	short systimer_17 ; no	
  2385 0000C60D 89D8                <1> 	mov	eax, ebx ; virtual address for callback routine 
  2386 0000C60F EB0D                <1> 	jmp	short systimer_18
  2387                              <1> 
  2388                              <1> systimer_17: ; signal response byte method
  2389                              <1> 	; ebx = virtual address
  2390                              <1> 	; [u.pgdir] = page directory's physical address
  2391                              <1> 	; 20/02/2017
  2392 0000C611 FE05[7E460100]      <1> 	inc	 byte [no_page_swap] ; 1 
  2393                              <1> 			; Do not add this page to swap queue
  2394                              <1> 			; and remove it from swap queue if it is
  2395                              <1> 			; on the queue.
  2396 0000C617 E8678CFFFF          <1> 	call	get_physical_addr
  2397 0000C61C 721A                <1> 	jc	short systimer_8 ; 07/06/2016
  2398                              <1> 	; eax = physical address of the virtual address in user's space
  2399                              <1> systimer_18:
  2400 0000C61E AB                  <1> 	stosd	; response addr (physical) or callback addr (virtual)
  2401 0000C61F FE05[3F410100]      <1> 	inc	byte [timer_events] ; 07/06/201
  2402                              <1> 	; 02/01/2017
  2403 0000C625 0FB605[334A0100]    <1> 	movzx	eax, byte [u.uno]
  2404 0000C62C FE80[7F470100]      <1> 	inc	byte [eax+p.timer-1]	
  2405                              <1> 	;
  2406 0000C632 FB                  <1> 	sti 	; enable interrupts
  2407 0000C633 E982F7FFFF          <1> 	jmp	sysret
  2408                              <1> 
  2409                              <1> systimer_8:
  2410                              <1> 	; 10/06/2016
  2411                              <1> 	; 07/06/2016
  2412 0000C638 28C0                <1> 	sub	al, al ; 0
  2413 0000C63A 8847F4              <1> 	mov	[edi-12], al ; clear process number (free timer event)
  2414                              <1> 	;mov	dword [edi], eax ; 0
  2415 0000C63D FB                  <1> 	sti
  2416 0000C63E A2[E4490100]        <1> 	mov	[u.r0], al ; 0
  2417 0000C643 E952F7FFFF          <1> 	jmp	error
  2418                              <1> 
  2419                              <1> systimer_9:
  2420                              <1> 	; 10/06/2016
  2421                              <1> 	; 07/06/2016
  2422 0000C648 28C0                <1> 	sub	al, al
  2423 0000C64A A2[E4490100]        <1> 	mov	byte [u.r0], al ; 0
  2424 0000C64F 3805[3F410100]      <1> 	cmp     byte [timer_events], al ;  0
  2425 0000C655 7631                <1> 	jna	short systimer_12
  2426                              <1> 
  2427                              <1> 	; Note: ecx and edx are undefined here
  2428                              <1> 	;	(for stop timer function)
  2429                              <1> 
  2430 0000C657 BE[7C4A0100]        <1> 	mov	esi, timer_set  ; beginning address of timer events
  2431                              <1> 				; setting space	 
  2432 0000C65C A0[334A0100]        <1> 	mov	al, [u.uno]
  2433                              <1> 	
  2434 0000C661 B710                <1> 	mov	bh, 16
  2435                              <1> 
  2436 0000C663 08DB                <1> 	or	bl, bl
  2437 0000C665 7544                <1> 	jnz	short systimer_15
  2438                              <1> 
  2439                              <1> 	; clear timer event areas belong to current process
  2440                              <1> 	; (for stopping all timer events belong to current process) 
  2441 0000C667 FA                  <1> 	cli 	; disable interrupts
  2442                              <1> systimer_10:
  2443                              <1> 	; 10/06/2016
  2444                              <1> 	; 07/06/2016 	
  2445 0000C668 8A26                <1> 	mov	ah, [esi]
  2446 0000C66A 08E4                <1> 	or	ah, ah ; 0 ?
  2447 0000C66C 7411                <1> 	jz	short systimer_11
  2448 0000C66E 38C4                <1> 	cmp	ah, al ; is the process number (owner) same ?
  2449 0000C670 750D                <1>         jne     short systimer_11 ; no
  2450                              <1> 
  2451                              <1> 	;mov	byte [esi], 0
  2452 0000C672 66C7060000          <1> 	mov	word [esi], 0 ; clear
  2453                              <1> 	;mov	dword [esi+12], 0 ; clear
  2454                              <1> 
  2455 0000C677 FE0D[3F410100]      <1> 	dec	byte [timer_events]
  2456 0000C67D 7409                <1> 	jz	short systimer_12
  2457                              <1> 
  2458                              <1> systimer_11:
  2459 0000C67F FECF                <1> 	dec	bh
  2460 0000C681 7405                <1> 	jz	short systimer_12
  2461 0000C683 83C610              <1> 	add	esi, 16
  2462 0000C686 EBE0                <1> 	jmp	short systimer_10
  2463                              <1> 
  2464                              <1> systimer_12:
  2465 0000C688 0FB635[334A0100]    <1> 	movzx	esi, byte [u.uno]
  2466 0000C68F 08DB                <1> 	or	bl, bl ; all timer events or one timer event ?
  2467 0000C691 740C                <1> 	jz	short systimer_13
  2468 0000C693 8A9E[7F470100]      <1> 	mov	bl, [esi+p.timer-1]
  2469 0000C699 20DB                <1> 	and	bl, bl	; previous number of timer events for the process
  2470 0000C69B 7408                <1> 	jz	short systimer_14
  2471 0000C69D FECB                <1> 	dec	bl  ; previous number of timer events for the process - 1
  2472                              <1> systimer_13:
  2473 0000C69F 889E[7F470100]      <1> 	mov	[esi+p.timer-1], bl ; 0 ; no timer events for process
  2474                              <1> systimer_14:
  2475 0000C6A5 FB                  <1> 	sti	; enable interrupts
  2476 0000C6A6 E90FF7FFFF          <1> 	jmp	sysret
  2477                              <1> 
  2478                              <1> systimer_15:
  2479 0000C6AB 38FB                <1> 	cmp	bl, bh ; 16
  2480 0000C6AD 0F8707FFFFFF        <1>         ja      systimer_4      ; max. 16 timer events !
  2481                              <1> 	;
  2482 0000C6B3 88DA                <1> 	mov	dl, bl
  2483 0000C6B5 FECA                <1> 	dec	dl  ; 16 -> 15 ... 1 -> 0 
  2484 0000C6B7 C0E204              <1> 	shl	dl, 4 ; * 16
  2485 0000C6BA 0FB6FA              <1> 	movzx	edi, dl
  2486 0000C6BD 01F7                <1> 	add	edi, esi ; timer_set 
  2487                              <1> 	
  2488 0000C6BF 3A07                <1> 	cmp	al, [edi] ; process number
  2489 0000C6C1 0F85F3FEFFFF        <1>         jne     systimer_4
  2490                              <1> 	
  2491                              <1> 	; same process ID
  2492 0000C6C7 FA                  <1> 	cli	; disable interrupts
  2493                              <1>  	; 10/06/2016 ; 02/01/2017
  2494                              <1> 	;mov	byte [edi], 0 
  2495 0000C6C8 66C7070000          <1> 	mov	word [edi], 0 ; clear
  2496                              <1> 	;mov	dword [edi+12], 0 ; clear
  2497 0000C6CD FE0D[3F410100]      <1> 	dec	byte [timer_events]
  2498 0000C6D3 EBB3                <1> 	jmp	short systimer_12
  2499                              <1> 
  2500                              <1> sysmdate: ; < change the modification time of a file >
  2501                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  2502                              <1> 	; temporary !
  2503 0000C6D5 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  2504 0000C6DA A3[484A0100]        <1>         mov     [u.error], eax
  2505 0000C6DF A3[E4490100]        <1>         mov     [u.r0], eax 
  2506 0000C6E4 E9B1F6FFFF          <1> 	jmp	error
  2507                              <1> 
  2508                              <1> sysvideo: ; VIDEO DATA TRANSFER FUNCTIONS
  2509                              <1> 	; 11/07/2016
  2510                              <1> 	; 13/06/2016
  2511                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  2512                              <1> 	;
  2513                              <1> 	;
  2514                              <1> 	; VIDEO DATA TRANSFER FUNCTIONS:
  2515                              <1> 	;
  2516                              <1> 	; Inputs:
  2517                              <1> 	;	BH = 0 = VIDEO BIOS Mode 3, tty/text mode data transfers
  2518                              <1> 	;	     BL = 
  2519                              <1> 	;		Bits 0&1, Transfer direction
  2520                              <1> 	;	     	 	0 - System to system
  2521                              <1> 	;			1 - User to system
  2522                              <1> 	;			2 - System to user
  2523                              <1> 	;			3 - User to user
  2524                              <1> 	;		Bits 2&3, Transfer Type
  2525                              <1> 	;			0 - Display page transfer	
  2526                              <1> 	;	     		1 - Display page window transfer
  2527                              <1> 	;	     		2 - Frame/Viewport/Window address transfer
  2528                              <1> 	;			3 - Window handle transfer		
  2529                              <1> 	;
  2530                              <1> 	;	     /// BL = 0 -> System to system (display page) transfer
  2531                              <1> 	;		 CL = Source page 
  2532                              <1> 	;		 DL = Destination page
  2533                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2534                              <1> 	;		 ECX = User buffer
  2535                              <1> 	;		 DL = Video page
  2536                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2537                              <1> 	;		(window in current display page and in current mode)	 	 		
  2538                              <1> 	;		 ESI = User's buffer address
  2539                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2540                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2541                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2542                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2543                              <1>         ;                If BL = 5 ->
  2544                              <1> 	;		 EDI = Swap address (in user's memory space)
  2545                              <1> 	;		 (If swap address > 0, previous content of the window
  2546                              <1> 	;		 will be saved into swap area in user's memory space)		
  2547                              <1> 	;	     /// BL = 4 -> system to system transfer 
  2548                              <1> 	;		 ESI = System's source buffer (video page) address
  2549                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2550                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2551                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2552                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2553                              <1> 	;		 EDI = System's destination buffer (video page) address
  2554                              <1> 	;
  2555                              <1> 	;	BH = 1 = CGA Graphics (0B8000h) data transfers
  2556                              <1> 	;	     BL = 
  2557                              <1> 	;	     	0 = Fill color (color in CL] (32K)
  2558                              <1> 	;		1 = User to system display page transfer
  2559                              <1> 	;		2 = System to user display page transfer
  2560                              <1> 	;		3 = NOT bits in window (ECX, EDX)
  2561                              <1> 	;		4 = Window copy (system to system)	
  2562                              <1> 	;	     	5 = User to system window transfer
  2563                              <1> 	;	     	6 = System to user window transfer
  2564                              <1> 	;		7 = AND display page bytes with CL
  2565                              <1> 	;		8 = OR display page bytes with CL
  2566                              <1> 	;		9 = XOR display page bytes with CL
  2567                              <1> 	;
  2568                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2569                              <1> 	;		 CL = Color value 
  2570                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2571                              <1> 	;		 ECX = User buffer
  2572                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2573                              <1> 	;		(window in current display page and in current mode)	 	 		
  2574                              <1> 	;		 ESI = User's buffer address
  2575                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2576                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2577                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2578                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2579                              <1>         ;	     /// BL = 4 -> system to system (window) transfer 
  2580                              <1> 	;		 ESI = System's source buffer (video page) address
  2581                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2582                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2583                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2584                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2585                              <1> 	;		 EDI = System's destination buffer (video page) address
  2586                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2587                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2588                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2589                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2590                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2591                              <1> 	;
  2592                              <1> 	;	BH = 2 = VGA Graphics (0A0000h) data transfers
  2593                              <1> 	;	     BL = 
  2594                              <1> 	;	     	x0h = Fill color (color in CL] (64K)
  2595                              <1> 	;		x1h = User to system display page transfer
  2596                              <1> 	;		x2h = System to user display page transfer
  2597                              <1> 	;		x3h = NOT bits in window (ECX, EDX)
  2598                              <1> 	;		x4h = Window copy (system to system)	
  2599                              <1> 	;	     	x5h = User to system window transfer
  2600                              <1> 	;	     	x6h = System to user window transfer
  2601                              <1> 	;		x7h = AND display page bytes with CL
  2602                              <1> 	;		x8h = OR display page bytes with CL
  2603                              <1> 	;		x9h = XOR display page bytes with CL
  2604                              <1> 	;		x = 0 -> screen width = 320
  2605                              <1> 	;		x = 1 -> screen width = 640
  2606                              <1> 	;		x = 2 -> screen width = 800
  2607                              <1> 	;
  2608                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2609                              <1> 	;		 CL = Color value 
  2610                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2611                              <1> 	;		 ECX = User buffer
  2612                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2613                              <1> 	;		(window in current display page and in current mode)	 	 		
  2614                              <1> 	;		 ESI = User's buffer address
  2615                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2616                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2617                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2618                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2619                              <1>        	;	     /// BL = 4 -> system to system (window) transfer 
  2620                              <1> 	;		 ESI = System's source buffer (video page) address
  2621                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2622                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2623                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2624                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2625                              <1> 	;		 EDI = System's destination buffer (video page) address
  2626                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2627                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2628                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2629                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2630                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2631                              <1> 	;
  2632                              <1> 	;	BH = 3 = Super VGA, LINEAR FRAME BUFFER data transfers
  2633                              <1> 	;	     BL = 
  2634                              <1> 	;	     	0 = Fill color (color in ECX] (Frame buffer size)
  2635                              <1> 	;		1 = User to system display page transfer
  2636                              <1> 	;		2 = System to user display page transfer
  2637                              <1> 	;		3 = NOT bits in window (ECX, EDX)
  2638                              <1> 	;		4 = Window copy (system to system)	
  2639                              <1> 	;	     	5 = User to system window transfer
  2640                              <1> 	;	     	6 = System to user window transfer
  2641                              <1> 	;		7 = AND display page bytes with ECX
  2642                              <1> 	;		8 = OR display page bytes with ECX
  2643                              <1> 	;		9 = XOR display page bytes with ECX
  2644                              <1> 	;
  2645                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2646                              <1> 	;		 CL = Color value 
  2647                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2648                              <1> 	;		 ECX = User buffer
  2649                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2650                              <1> 	;		(window in current display page and in current mode)	 	 		
  2651                              <1> 	;		 ESI = User's buffer address
  2652                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2653                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2654                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2655                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2656                              <1> 	;	     /// BL = 4 -> system to system (window) transfer 
  2657                              <1> 	;		 ESI = System's source buffer (video page) address
  2658                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2659                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2660                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2661                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2662                              <1> 	;		 EDI = System's destination buffer (video page) address
  2663                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2664                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2665                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2666                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2667                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2668                              <1> 	;
  2669                              <1> 	; Outputs:
  2670                              <1> 	;	EAX = transfer/byte count
  2671                              <1> 	;
  2672                              <1> 	;	NOTE: If the source or destination address passes out of
  2673                              <1> 	;	video pages (display memory limits), data will not be transferred
  2674                              <1> 	;	and EAX will return as 0.
  2675                              <1> 	;
  2676                              <1> 	;
  2677                              <1> 	; DIRECT (STANDARD VGA/CGA) DISPLAY MEMORY ACCESS FUNCTIONS:
  2678                              <1> 	;
  2679                              <1> 	;	BH = 4 = CGA direct video memory (0B8000h, 32K) access
  2680                              <1> 	;		Page directory & page tables of the user's
  2681                              <1> 	;		program will be updated to direct access to
  2682                              <1> 	;		0B8000h (32K) video (CGA, color) memory; if
  2683                              <1> 	;		there is not a permission  conflict or lock!  
  2684                              <1> 	;	        (User's program/process will have permision to
  2685                              <1> 	;		access locked display memory if the owner is
  2686                              <1> 	;		it's parent.)
  2687                              <1>         ;
  2688                              <1> 	;	    Screen width = 320	
  2689                              <1> 	;
  2690                              <1> 	;	BH = 5 = VGA direct video memory (0A0000h, 64K) access
  2691                              <1> 	;		Page directory & page tables of the user's
  2692                              <1> 	;		program will be updated to direct access to
  2693                              <1> 	;		0A0000h (64K) video (VGA) memory; if there is not
  2694                              <1> 	;		a permission conflict or lock!  
  2695                              <1> 	;	        (User's program/process will have permision to
  2696                              <1> 	;		access locked display memory if the owner is
  2697                              <1> 	;		it's parent.)
  2698                              <1> 	;		
  2699                              <1> 	;	    BL = Screen width (320, 640, 800) 
  2700                              <1> 	;			
  2701                              <1> 	; Outputs:
  2702                              <1> 	;	EAX = Display mmory address for direct access
  2703                              <1> 	;	      0A0000h for VGA, 0B8000h for CGA	
  2704                              <1> 	;	(Display memory size: 32K for CGA, 64K for VGA)
  2705                              <1> 	; 	EAX = 0 if display page access permission has been denied. 
  2706                              <1> 	;	      (Locked!) 	
  2707                              <1> 	;	      	 	
  2708                              <1> 	; LINEAR FRAME BUFFER ACCESS FUNCTIONS:
  2709                              <1> 	;
  2710                              <1> 	;	BH = 6 = Linear Frame Buffer direct video memory access
  2711                              <1> 	;
  2712                              <1> 	;		Page directory & page tables of the user's
  2713                              <1> 	;		program will be updated to direct access to
  2714                              <1> 	;		the configured LFB (Linear Frame Buffer) address,
  2715                              <1> 	;		if there is not a permission conflict or lock!  
  2716                              <1> 	;	        (User's program/process will have permision to
  2717                              <1> 	;		access locked display memory if the owner is
  2718                              <1> 	;		it's parent.)
  2719                              <1> 	;			
  2720                              <1> 	;		Return: EAX = Linear Frame Buffer address
  2721                              <1> 	;			EDX = Frame Buffer Size in bytes	
  2722                              <1> 	;	
  2723                              <1> 	;	BH = 7 = Get Linear Frame Buffer info (for current mode)
  2724                              <1> 	;		
  2725                              <1> 	;		Return:
  2726                              <1> 	;		EAX = Frame Buffer Address (0 = is not in use)
  2727                              <1> 	;		EDX = Frame Buffer Size in bytes
  2728                              <1> 	;		BL = Current Video Mode
  2729                              <1> 	;		     BL = 0FFh -> Super VGA (Extended VGA)
  2730                              <1> 	;		     If BL = 0FFh, 
  2731                              <1>         ;                       BH = 0 = 16 colors
  2732                              <1> 	;			BH = 1 = 256 colors
  2733                              <1> 	;			BH = 2 = 66536 colors
  2734                              <1> 	;			BH = 3 = 24 bits TRUE (16M) colors
  2735                              <1> 	;			BH = 4 = 32 bits TRUE (16M) colors
  2736                              <1> 	;		ECX = Pixel resolution
  2737                              <1> 	;		      CX = Width (640, 800, 1024, 1366, 1920)
  2738                              <1> 	;		      High 16 bits of ECX = Height  
  2739                              <1> 	;
  2740                              <1> 	;	NOTE: Each process will have it's own frame buffer
  2741                              <1> 	;	      address and resolution parameters in 'u' area.
  2742                              <1> 	;	      Then, if the current frame buffer & resolution
  2743                              <1> 	;	      is different, frame buffer r/w functions
  2744                              <1> 	;	      will use scale factor to convert process's
  2745                              <1>         ;             pixel coordinates to actual screen coordinates.                            
  2746                              <1> 	;	      resolution -> dimensional scale
  2747                              <1> 	;	      color size -> color scale
  2748                              <1> 	;	     * RGB (TRUE) colors to 256 colors conversion:	
  2749                              <1>         ;             TRUE Colors -> 8,8,8 (R,G,B; byte 0 is R)            
  2750                              <1> 	;	      256 colors -> 2,2,2,2 (R,G,B,L; bit 0&1 is R)
  2751                              <1> 	; 		  bit 6&7 -> luminosity base level (0,1,2,3)
  2752                              <1> 	;		  bit 4&5 -> blue level (0,1,2,3)
  2753                              <1> 	;		  bit 2%3 -> green level (0,1,2,3)
  2754                              <1> 	;		  bit 0&1 -> red level (0,1,2,3)
  2755                              <1> 	;	      Example: total red level : luminosity + red level   				
  2756                              <1> 	;	      Luminosity base level: 0 -> 16
  2757                              <1> 	;		 		     1 -> 32
  2758                              <1> 	;				     2 -> 64
  2759                              <1> 	;				     3 -> 128
  2760                              <1> 	;	      Color level:	
  2761                              <1> 	;				    0 -> 0
  2762                              <1> 	;				    1 -> luminosity level
  2763                              <1> 	;				    2 -> luminosity level + 64
  2764                              <1> 	;				    3 -> 255
  2765                              <1> 	;	     Luminosity base level = min (R,G,B)
  2766                              <1> 	;			if it is <16, it will be set to 16
  2767                              <1> 	;	     Color levels: Color values are fixed to (nearest) 
  2768                              <1> 	;		   one of all possible set level (step) values
  2769                              <1> 	;		   (according to luminosity base level); then
  2770                              <1> 	;		   color levels are set to R-L, G-L, B-L.
  2771                              <1> 	;	 For example: If luminosity base level is 32
  2772                              <1> 	;		  all possible set values are 0, 32, 96, 255. 	 			
  2773                              <1> 	;
  2774                              <1> 	;	    * RGB (TRUE) colors to 16 colors conversion:
  2775                              <1> 	;	    16 colors: R, B,G, L bits (4 bits)
  2776                              <1> 	;	    	   If any one of R,G,B >= 128 L = 1 		     	
  2777                              <1>  	;		   If max. value of (R,G,B) >= 32, it is 1
  2778                              <1> 	;		      else all color bits (R&G&B&L) are 0
  2779                              <1> 	;		   If the second value >= max. value / 2
  2780                              <1> 	;		      it is 1
  2781                              <1> 	;		   If third value value >= max. value / 2
  2782                              <1> 	;		      it is 1
  2783                              <1> 	;	    Example: R = 132, G = 64, B = 78
  2784                              <1> 	;		     L = 1, R = 1
  2785                              <1> 	;		     G < 66 --> G = 0
  2786                              <1> 	;		     B >= 66 --> B = 1	 		 	  								 	 					
  2787                              <1> 
  2788                              <1> 	; 16/05/2016
  2789 0000C6E9 31C0                <1> 	xor	eax, eax
  2790 0000C6EB A3[E4490100]        <1> 	mov	[u.r0], eax
  2791                              <1> 
  2792 0000C6F0 20FF                <1> 	and	bh, bh
  2793 0000C6F2 0F8572020000        <1> 	jnz	sysvideo_13 ; 11/07/2016
  2794                              <1> 	
  2795                              <1> 	; Video mode 0, 80*25 text mode, CGA 16 colors  ; [CRT_MODE] = 3
  2796 0000C6F8 88DF                <1> 	mov	bh, bl
  2797 0000C6FA C0EF02              <1> 	shr	bh, 2
  2798 0000C6FD 20FF                <1> 	and	bh, bh
  2799 0000C6FF 0F8598000000        <1>         jnz     sysvideo_4
  2800 0000C705 BF00800B00          <1> 	mov	edi, 0B8000h
  2801 0000C70A 20D2                <1> 	and	dl, dl
  2802 0000C70C 7413                <1> 	jz	short sysvideo_1
  2803 0000C70E 80FA07              <1> 	cmp	dl, 7
  2804 0000C711 0F87A3F6FFFF        <1> 	ja	sysret
  2805                              <1> sysvideo_0:
  2806 0000C717 81C7A00F0000        <1> 	add	edi, 80*25*2
  2807 0000C71D FECA                <1> 	dec	dl
  2808 0000C71F 75F6                <1> 	jnz	short sysvideo_0	
  2809                              <1> sysvideo_1:	
  2810 0000C721 80E303              <1> 	and	bl, 3
  2811 0000C724 7530                <1> 	jnz	short sysvideo_2
  2812 0000C726 80F907              <1> 	cmp	cl, 7
  2813 0000C729 0F878BF6FFFF        <1> 	ja	sysret
  2814                              <1> 	; system to system video/display page transfer (mode 0)
  2815 0000C72F BE00800B00          <1> 	mov	esi, 0B8000h
  2816 0000C734 0FB6C1              <1> 	movzx	eax, cl
  2817 0000C737 BAA00F0000          <1> 	mov	edx, 80*25*2
  2818 0000C73C F7E2                <1> 	mul	edx
  2819 0000C73E 01C6                <1> 	add	esi, eax
  2820 0000C740 B9A00F0000          <1> 	mov	ecx, (80*25*2)
  2821 0000C745 890D[E4490100]      <1> 	mov	[u.r0], ecx
  2822 0000C74B 66C1E902            <1> 	shr	cx, 2 ; /4
  2823 0000C74F F3A5                <1> 	rep	movsd
  2824 0000C751 E964F6FFFF          <1> 	jmp	sysret	
  2825                              <1> sysvideo_2:  
  2826 0000C756 80FB02              <1> 	cmp	bl, 2
  2827 0000C759 0F875BF6FFFF        <1>         ja      sysret
  2828 0000C75F 721F                <1> 	jb	short sysvideo_3
  2829                              <1> 	; system to user video/display page transfer (mode 0)
  2830 0000C761 89FE                <1> 	mov	esi, edi
  2831 0000C763 89CF                <1> 	mov	edi, ecx ; user buffer
  2832 0000C765 B9A00F0000          <1> 	mov	ecx, 80*25*2
  2833 0000C76A E831190000          <1> 	call	transfer_to_user_buffer ; fast transfer
  2834 0000C76F 0F8245F6FFFF        <1> 	jc	sysret
  2835 0000C775 890D[E4490100]      <1> 	mov	[u.r0], ecx
  2836 0000C77B E93AF6FFFF          <1> 	jmp	sysret 	
  2837                              <1> sysvideo_3: 
  2838                              <1> 	; user to system video/display page transfer (mode 0)	
  2839 0000C780 89CE                <1> 	mov	esi, ecx ; user buffer
  2840                              <1> 	; edi = video page address
  2841 0000C782 B9A00F0000          <1> 	mov	ecx, 80*25*2
  2842 0000C787 E85E190000          <1> 	call	transfer_from_user_buffer ; fast transfer
  2843 0000C78C 0F8228F6FFFF        <1> 	jc	sysret
  2844 0000C792 890D[E4490100]      <1> 	mov	[u.r0], ecx		
  2845 0000C798 E91DF6FFFF          <1> 	jmp	sysret
  2846                              <1> sysvideo_4:
  2847 0000C79D 80E303              <1> 	and	bl, 3
  2848 0000C7A0 0F85F6000000        <1>         jnz     sysvideo_9
  2849 0000C7A6 80F907              <1> 	cmp	cl, 7
  2850 0000C7A9 0F870BF6FFFF        <1> 	ja	sysret
  2851                              <1> 	; system to system video/display page window transfer (mode 0)
  2852 0000C7AF 81FE00800B00        <1> 	cmp	esi, 0B8000h
  2853 0000C7B5 0F82FFF5FFFF        <1> 	jb	sysret
  2854 0000C7BB 81FE00FD0B00        <1> 	cmp	esi, 0B8000h+(80*25*2*8)
  2855 0000C7C1 0F83F3F5FFFF        <1> 	jnb	sysret
  2856 0000C7C7 81FF00800B00        <1> 	cmp	edi, 0B8000h
  2857 0000C7CD 0F82E7F5FFFF        <1> 	jb	sysret
  2858 0000C7D3 81FF00FD0B00        <1>         cmp     edi, 0B8000h+(80*25*2*8)
  2859 0000C7D9 0F83DBF5FFFF        <1> 	jnb	sysret
  2860                              <1> 	;
  2861 0000C7DF 51                  <1> 	push	ecx
  2862 0000C7E0 52                  <1> 	push	edx
  2863 0000C7E1 0FB7C1              <1> 	movzx	eax, cx ; top left column
  2864 0000C7E4 50                  <1> 	push	eax
  2865 0000C7E5 C1E910              <1> 	shr	ecx, 16 ; top row
  2866 0000C7E8 66B8A000            <1> 	mov	ax, 80*2 ; 80 colums, 160 bytes per row
  2867 0000C7EC F7E1                <1> 	mul	ecx
  2868 0000C7EE 01C6                <1> 	add	esi, eax
  2869 0000C7F0 01C7                <1> 	add	edi, eax
  2870 0000C7F2 58                  <1> 	pop	eax
  2871 0000C7F3 66D1E0              <1> 	shl	ax, 1 ; *2 	
  2872 0000C7F6 01C6                <1> 	add	esi, eax
  2873 0000C7F8 01C7                <1> 	add	edi, eax
  2874 0000C7FA 5A                  <1> 	pop	edx
  2875 0000C7FB 59                  <1> 	pop	ecx
  2876 0000C7FC B800FD0B00          <1> 	mov	eax, 0B8000h+(80*25*2*8)
  2877 0000C801 39C6                <1> 	cmp	esi, eax
  2878 0000C803 0F83B1F5FFFF        <1> 	jnb	sysret
  2879 0000C809 39C6                <1> 	cmp	esi, eax
  2880 0000C80B 0F83A9F5FFFF        <1> 	jnb	sysret	
  2881                              <1> 
  2882 0000C811 56                  <1> 	push	esi ; ****
  2883 0000C812 57                  <1> 	push	edi ; ***
  2884 0000C813 52                  <1> 	push	edx ; **
  2885 0000C814 51                  <1> 	push	ecx ; *
  2886 0000C815 C1E910              <1> 	shr	ecx, 16 ; top row
  2887 0000C818 C1EA10              <1> 	shr	edx, 16 ; bottom row
  2888 0000C81B 83F918              <1> 	cmp	ecx, 24 ; max. 25 rows
  2889 0000C81E 7773                <1> 	ja	short sysvideo_6
  2890 0000C820 83FA18              <1> 	cmp	edx, 24 ; max. 25 rows
  2891 0000C823 776E                <1> 	ja	short sysvideo_6		
  2892 0000C825 28CA                <1> 	sub	dl, cl
  2893 0000C827 726A                <1> 	jc	short sysvideo_6
  2894 0000C829 50                  <1> 	push	eax ; *****
  2895 0000C82A 89D3                <1> 	mov	ebx, edx ; row count - 1
  2896 0000C82C B8A0000000          <1> 	mov	eax, 80*2
  2897 0000C831 F7E0                <1> 	mul	eax
  2898 0000C833 01C6                <1> 	add	esi, eax
  2899 0000C835 01C7                <1> 	add	edi, eax
  2900 0000C837 58                  <1> 	pop	eax ; *****
  2901 0000C838 39C6                <1> 	cmp	esi, eax
  2902 0000C83A 7757                <1> 	ja	short sysvideo_6
  2903 0000C83C 39C7                <1> 	cmp	edi, eax
  2904 0000C83E 7753                <1> 	ja	short sysvideo_6
  2905 0000C840 59                  <1> 	pop	ecx ; *
  2906 0000C841 5A                  <1> 	pop	edx ; **
  2907 0000C842 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  2908 0000C848 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  2909 0000C84E 83F94F              <1> 	cmp	ecx, 79 ; max. 80 columns
  2910 0000C851 7742                <1> 	ja	short sysvideo_7
  2911 0000C853 83FA4F              <1> 	cmp	edx, 79 ; max. 80 columns
  2912 0000C856 773D                <1> 	ja	short sysvideo_7
  2913 0000C858 28CA                <1> 	sub	dl, cl
  2914 0000C85A 7639                <1> 	jna	short sysvideo_7
  2915                              <1> 	; edx = column count (width) - 1
  2916 0000C85C D0E2                <1> 	shl	dl, 1
  2917 0000C85E 01D6                <1> 	add	esi, edx
  2918 0000C860 01D7                <1> 	add	edi, edx
  2919 0000C862 39C6                <1> 	cmp	esi, eax
  2920 0000C864 772F                <1> 	ja	short sysvideo_7
  2921 0000C866 39C7                <1> 	cmp	edi, eax
  2922 0000C868 772B                <1> 	ja	short sysvideo_7
  2923 0000C86A 5F                  <1> 	pop	edi ; ***
  2924 0000C86B 5E                  <1> 	pop	esi ; ****
  2925 0000C86C FEC3                <1> 	inc	bl
  2926 0000C86E FEC2                <1> 	inc	dl ; column count
  2927 0000C870 88D7                <1> 	mov	bh, dl
  2928 0000C872 D0E2                <1> 	shl	dl, 1
  2929 0000C874 B8A0000000          <1> 	mov	eax, 80*2
  2930 0000C879 28D0                <1> 	sub	al, dl ; (80 - columns) * 2
  2931                              <1> sysvideo_5:	
  2932 0000C87B 88F9                <1> 	mov	cl, bh
  2933 0000C87D 0115[E4490100]      <1> 	add	[u.r0], edx
  2934 0000C883 F366A5              <1> 	rep	movsw
  2935 0000C886 01C6                <1> 	add	esi, eax ; next row
  2936 0000C888 01C7                <1> 	add	edi, eax ; next row
  2937 0000C88A FECB                <1> 	dec	bl
  2938 0000C88C 75ED                <1> 	jnz	short sysvideo_5
  2939 0000C88E E927F5FFFF          <1> 	jmp	sysret
  2940                              <1> 
  2941                              <1> sysvideo_6:
  2942 0000C893 59                  <1> 	pop	ecx ; *
  2943 0000C894 5A                  <1> 	pop	edx ; **
  2944                              <1> sysvideo_7:	
  2945 0000C895 5F                  <1> 	pop	edi ; ***
  2946 0000C896 5E                  <1> 	pop	esi ; ****
  2947 0000C897 E91EF5FFFF          <1> 	jmp	sysret
  2948                              <1> 
  2949                              <1> sysvideo_9:  
  2950 0000C89C 80FB02              <1> 	cmp	bl, 2
  2951 0000C89F 0F8715F5FFFF        <1>         ja      sysret
  2952                              <1> 
  2953 0000C8A5 56                  <1> 	push	esi ; ****
  2954 0000C8A6 57                  <1> 	push	edi ; ***
  2955 0000C8A7 52                  <1> 	push	edx ; **
  2956 0000C8A8 51                  <1> 	push	ecx ; *
  2957                              <1> 
  2958 0000C8A9 C1E910              <1> 	shr	ecx, 16 ; top row
  2959 0000C8AC C1EA10              <1> 	shr	edx, 16 ; bottom row
  2960 0000C8AF 83F918              <1> 	cmp	ecx, 24 ; max. 25 rows
  2961 0000C8B2 77DF                <1> 	ja	short sysvideo_6
  2962 0000C8B4 83FA18              <1> 	cmp	edx, 24 ; max. 25 rows
  2963 0000C8B7 77DA                <1> 	ja	short sysvideo_6		
  2964 0000C8B9 28CA                <1> 	sub	dl, cl
  2965 0000C8BB 72D6                <1> 	jc	short sysvideo_6
  2966                              <1> 
  2967 0000C8BD 88CD                <1> 	mov	ch, cl ; top row
  2968 0000C8BF 8A0D[D6330100]      <1> 	mov	cl, [ACTIVE_PAGE]
  2969 0000C8C5 BFA00F0000          <1> 	mov	edi, 80*25*2
  2970 0000C8CA D3E7                <1> 	shl	edi, cl 
  2971 0000C8CC 81C760700B00        <1> 	add	edi, 0B8000h - 80*25*2
  2972                              <1> 
  2973 0000C8D2 88D7                <1> 	mov	bh, dl ; row count - 1
  2974 0000C8D4 88EA                <1> 	mov	dl, ch ; top row
  2975 0000C8D6 B8A0000000          <1> 	mov	eax, 80*2
  2976 0000C8DB F7E2                <1> 	mul	edx
  2977 0000C8DD 01C7                <1> 	add	edi, eax
  2978                              <1> 
  2979 0000C8DF 59                  <1> 	pop	ecx ; *
  2980 0000C8E0 5A                  <1> 	pop	edx ; **
  2981 0000C8E1 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  2982 0000C8E7 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  2983 0000C8ED 83F94F              <1> 	cmp	ecx, 79 ; max. 80 columns
  2984 0000C8F0 77A3                <1> 	ja	short sysvideo_7
  2985 0000C8F2 83FA4F              <1> 	cmp	edx, 79 ; max. 80 columns
  2986 0000C8F5 779E                <1> 	ja	short sysvideo_7
  2987                              <1> 	
  2988 0000C8F7 28CA                <1> 	sub	dl, cl
  2989 0000C8F9 769A                <1> 	jna	short sysvideo_7
  2990                              <1> 	
  2991 0000C8FB 0FB6C1              <1> 	movzx	eax, cl ; left column
  2992 0000C8FE D0E0                <1> 	shl	al, 1  ; column * 2
  2993 0000C900 01C7                <1> 	add	edi, eax
  2994                              <1> 
  2995 0000C902 FEC2                <1> 	inc	dl ; column count
  2996 0000C904 D0E2                <1> 	shl	dl, 1
  2997 0000C906 88D1                <1> 	mov	cl, dl ; column count * 2
  2998 0000C908 B2A0                <1> 	mov	dl, 80*2
  2999 0000C90A 58                  <1> 	pop	eax ; *** (swap address)
  3000 0000C90B 5E                  <1> 	pop	esi ; ****
  3001 0000C90C FEC7                <1> 	inc	bh
  3002                              <1> 	
  3003                              <1> 	;mov	edx, 80*2
  3004 0000C90E B2A0                <1> 	mov	dl, 80*2
  3005                              <1> 	;
  3006 0000C910 80FB01              <1> 	cmp	bl, 1
  3007 0000C913 7735                <1> 	ja	short sysvideo_11
  3008                              <1> 
  3009                              <1> 	; user to system video/display page window transfer (mode 0)	
  3010 0000C915 21C0                <1> 	and	eax, eax ; swap address
  3011 0000C917 7413                <1> 	jz	short sysvideo_10 ; no window swap
  3012                              <1> 	; save previous window content in user's buffer (swap address)
  3013 0000C919 56                  <1> 	push	esi ; user buffer
  3014 0000C91A 57                  <1> 	push	edi ; beginning address of the window
  3015 0000C91B 89FE                <1> 	mov	esi, edi
  3016 0000C91D 89C7                <1> 	mov	edi, eax
  3017 0000C91F E87C170000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3018 0000C924 5F                  <1> 	pop	edi
  3019 0000C925 5E                  <1> 	pop	esi
  3020 0000C926 0F828EF4FFFF        <1> 	jc	sysret
  3021                              <1> sysvideo_10: 
  3022                              <1> 	; user to system video/display page window transfer (mode 0)	
  3023                              <1> 	; esi =	user buffer
  3024 0000C92C E8B9170000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3025 0000C931 0F8283F4FFFF        <1> 	jc	sysret
  3026 0000C937 010D[E4490100]      <1> 	add	[u.r0], ecx
  3027 0000C93D 01D7                <1> 	add	edi, edx ; next row
  3028 0000C93F 01CE                <1> 	add	esi, ecx
  3029 0000C941 FECF                <1> 	dec	bh
  3030 0000C943 75E7                <1> 	jnz	short sysvideo_10
  3031 0000C945 E970F4FFFF          <1> 	jmp	sysret
  3032                              <1> 	
  3033                              <1> sysvideo_11:
  3034                              <1> 	; system to user video/display page window transfer (mode 0)
  3035 0000C94A 87FE                <1> 	xchg	edi, esi
  3036                              <1> sysvideo_12:
  3037                              <1> 	; esi = beginning address of the window
  3038                              <1> 	; edi =	user buffer	
  3039 0000C94C E84F170000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3040 0000C951 0F8263F4FFFF        <1> 	jc	sysret
  3041 0000C957 010D[E4490100]      <1> 	add	[u.r0], ecx
  3042 0000C95D 01D6                <1> 	add	esi, edx ; next row
  3043 0000C95F 01CF                <1> 	add	edi, ecx
  3044 0000C961 FECF                <1> 	dec	bh
  3045 0000C963 75E7                <1> 	jnz	short sysvideo_12
  3046 0000C965 E950F4FFFF          <1> 	jmp	sysret
  3047                              <1> 
  3048                              <1> sysvideo_13:
  3049 0000C96A 80FF01              <1> 	cmp	bh, 1
  3050 0000C96D 0F871F030000        <1>         ja      sysvideo_38
  3051                              <1> 	; BH = 1 = CGA Graphics (0B8000h) data transfers
  3052                              <1> 
  3053 0000C973 20DB                <1> 	and	bl, bl
  3054 0000C975 751A                <1> 	jnz	short sysvideo_14
  3055                              <1> 
  3056                              <1> 	; BL =	0 = Fill color (color in CL] (32K)
  3057                              <1> 
  3058 0000C977 88C8                <1> 	mov	al, cl
  3059 0000C979 B900800000          <1> 	mov	ecx, 32768
  3060 0000C97E 66890D[E4490100]    <1> 	mov	[u.r0], cx
  3061 0000C985 BF00800B00          <1> 	mov	edi, 0B8000h
  3062 0000C98A F3AB                <1> 	rep	stosd
  3063 0000C98C E929F4FFFF          <1> 	jmp	sysret
  3064                              <1> 
  3065                              <1> sysvideo_14:
  3066 0000C991 80FB01              <1> 	cmp	bl, 1
  3067 0000C994 7723                <1> 	ja	short sysvideo_16
  3068                              <1> 
  3069 0000C996 89CE                <1> 	mov	esi, ecx ; user buffer
  3070                              <1> 	; BL = 1 = user to system video/display page transfer
  3071                              <1> sysvideo_15:	
  3072 0000C998 BF00800B00          <1> 	mov	edi, 0B8000h
  3073                              <1> 	; edi = video page address
  3074 0000C99D B900800000          <1> 	mov	ecx, 32768
  3075 0000C9A2 E843170000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3076 0000C9A7 0F820DF4FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3077 0000C9AD 66890D[E4490100]    <1> 	mov	[u.r0], cx		
  3078 0000C9B4 E901F4FFFF          <1> 	jmp	sysret
  3079                              <1> 
  3080                              <1> sysvideo_16:
  3081 0000C9B9 80FB02              <1> 	cmp	bl, 2	
  3082 0000C9BC 7723                <1> 	ja	short sysvideo_18
  3083                              <1> 
  3084 0000C9BE 89CF                <1> 	mov	edi, ecx ; user buffer
  3085                              <1> 	; BL = 2 = system to user video/display page transfer
  3086                              <1> sysvideo_17:	
  3087 0000C9C0 BE00800B00          <1> 	mov	esi, 0B8000h
  3088 0000C9C5 B900800000          <1> 	mov	ecx, 32768
  3089 0000C9CA E8D1160000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3090 0000C9CF 0F82E5F3FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3091 0000C9D5 66890D[E4490100]    <1> 	mov	[u.r0], cx
  3092 0000C9DC E9D9F3FFFF          <1> 	jmp	sysret 	
  3093                              <1> 
  3094                              <1> sysvideo_18:
  3095 0000C9E1 80FB03              <1> 	cmp	bl, 3
  3096 0000C9E4 777E                <1> 	ja	short sysvideo_23
  3097                              <1> 
  3098                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  3099                              <1> 
  3100 0000C9E6 BF00800B00          <1> 	mov	edi, 0B8000h
  3101 0000C9EB 89FE                <1> 	mov	esi, edi
  3102                              <1> 	
  3103 0000C9ED 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3104 0000C9EF 7716                <1> 	ja	short sysvideo_20 ; window
  3105                              <1> 	; full screen (update)
  3106 0000C9F1 B900800000          <1> 	mov	ecx, 32768
  3107 0000C9F6 66890D[E4490100]    <1> 	mov	[u.r0], cx
  3108                              <1> sysvideo_19:
  3109 0000C9FD F616                <1> 	not	byte [esi] ; NOT operation
  3110 0000C9FF 46                  <1> 	inc	esi
  3111 0000CA00 E2FB                <1> 	loop	sysvideo_19
  3112 0000CA02 E9B3F3FFFF          <1> 	jmp	sysret
  3113                              <1> sysvideo_20:
  3114 0000CA07 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3115 0000CA0A 6629C8              <1> 	sub	ax, cx  ; - top left column
  3116 0000CA0D 0F82A7F3FFFF        <1>         jb      sysret ; invalid
  3117 0000CA13 6640                <1> 	inc	ax ; same column no == 1 column	 
  3118 0000CA15 50                  <1> 	push	eax ; byte count per window row
  3119 0000CA16 52                  <1> 	push	edx
  3120 0000CA17 BB40010000          <1> 	mov	ebx, 320 ; screen width
  3121 0000CA1C 89C8                <1> 	mov	eax, ecx
  3122 0000CA1E C1E810              <1> 	shr	eax, 16  ; top row
  3123 0000CA21 F7E3                <1> 	mul	ebx
  3124 0000CA23 6689CA              <1> 	mov	dx, cx ; top left column
  3125 0000CA26 01D0                <1> 	add	eax, edx
  3126 0000CA28 01C6                <1> 	add	esi, eax ; start address 
  3127 0000CA2A 59                  <1> 	pop	ecx ; edx
  3128 0000CA2B 89C8                <1> 	mov	eax, ecx
  3129 0000CA2D C1E810              <1> 	shr	eax, 16 ; bottom row
  3130 0000CA30 F7E3                <1> 	mul	ebx
  3131 0000CA32 6689CA              <1> 	mov	dx, cx ; bottom right column
  3132 0000CA35 01D0                <1> 	add	eax, edx
  3133 0000CA37 01C7                <1> 	add	edi, eax ; stop address (included)
  3134 0000CA39 5A                  <1> 	pop	edx ; byte count per window row
  3135 0000CA3A 81FFFFFF0B00        <1> 	cmp	edi, 0BFFFFh
  3136 0000CA40 0F8774F3FFFF        <1> 	ja	sysret	
  3137 0000CA46 56                  <1> 	push	esi
  3138 0000CA47 4E                  <1> 	dec	esi
  3139                              <1> sysvideo_21:
  3140 0000CA48 89D1                <1> 	mov	ecx, edx
  3141                              <1> sysvideo_22:
  3142 0000CA4A 46                  <1> 	inc	esi
  3143 0000CA4B F616                <1> 	not	byte [esi]
  3144 0000CA4D E2FB                <1> 	loop	sysvideo_22
  3145 0000CA4F 01DE                <1> 	add	esi, ebx ; bytes per screen row
  3146                              <1> 	;
  3147 0000CA51 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  3148 0000CA53 76F3                <1> 	jna	short sysvideo_21
  3149 0000CA55 5E                  <1> 	pop	esi
  3150 0000CA56 29F7                <1> 	sub	edi, esi
  3151 0000CA58 66893D[E4490100]    <1> 	mov	[u.r0], di
  3152 0000CA5F E956F3FFFF          <1> 	jmp	sysret
  3153                              <1> 
  3154                              <1> sysvideo_23:
  3155 0000CA64 80FB04              <1> 	cmp	bl, 4
  3156 0000CA67 0F87A7000000        <1>         ja      sysvideo_26
  3157                              <1> 
  3158                              <1> 	; BL = 4 = window copy (system to system)
  3159                              <1> 
  3160 0000CA6D B800800B00          <1> 	mov	eax, 0B8000h
  3161 0000CA72 39C6                <1> 	cmp	esi, eax
  3162 0000CA74 0F8240F3FFFF        <1> 	jb	sysret
  3163 0000CA7A 39C7                <1> 	cmp	edi, eax
  3164 0000CA7C 0F8238F3FFFF        <1> 	jb	sysret
  3165 0000CA82 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3166 0000CA86 39C6                <1> 	cmp	esi, eax
  3167 0000CA88 0F872CF3FFFF        <1> 	ja	sysret
  3168 0000CA8E 39C7                <1> 	cmp	edi, eax
  3169 0000CA90 0F8724F3FFFF        <1> 	ja	sysret
  3170                              <1> 	
  3171 0000CA96 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3172 0000CA98 7714                <1> 	ja	short sysvideo_24 ; window
  3173                              <1> 	; full screen copy
  3174 0000CA9A 89C1                <1> 	mov	ecx, eax
  3175 0000CA9C 29F9                <1> 	sub	ecx, edi
  3176 0000CA9E 6641                <1> 	inc	cx
  3177 0000CAA0 66890D[E4490100]    <1> 	mov	[u.r0], cx
  3178 0000CAA7 F3A4                <1> 	rep	movsb
  3179 0000CAA9 E90CF3FFFF          <1> 	jmp	sysret
  3180                              <1> sysvideo_24:
  3181 0000CAAE 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3182 0000CAB1 6629C8              <1> 	sub	ax, cx  ; - top left column
  3183 0000CAB4 0F8200F3FFFF        <1>         jb      sysret ; invalid
  3184 0000CABA 6640                <1> 	inc	ax ; same column no == 1 column	 
  3185 0000CABC 50                  <1> 	push	eax ; byte count per window row
  3186                              <1> 	;
  3187 0000CABD 52                  <1> 	push	edx
  3188 0000CABE BB40010000          <1> 	mov	ebx, 320 ; screen width
  3189 0000CAC3 89C8                <1> 	mov	eax, ecx
  3190 0000CAC5 C1E810              <1> 	shr	eax, 16	; top row
  3191 0000CAC8 F7E3                <1> 	mul	ebx
  3192 0000CACA 6689CA              <1> 	mov	dx, cx ; top left column
  3193 0000CACD 01D0                <1> 	add	eax, edx
  3194 0000CACF 01C7                <1> 	add	edi, eax ; start address 
  3195 0000CAD1 01C6                <1> 	add	esi, eax
  3196 0000CAD3 59                  <1> 	pop	ecx ; edx
  3197 0000CAD4 89C8                <1> 	mov	eax, ecx
  3198 0000CAD6 C1E810              <1> 	shr	eax, 16 ; bottom row
  3199 0000CAD9 F7E3                <1> 	mul	ebx
  3200 0000CADB 6689CA              <1> 	mov	dx, cx ; bottom right column
  3201 0000CADE 01D0                <1> 	add	eax, edx
  3202 0000CAE0 5A                  <1> 	pop	edx ; byte count per window row
  3203 0000CAE1 0500800B00          <1> 	add	eax, 0B8000h
  3204 0000CAE6 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3205 0000CAEB 0F87C9F2FFFF        <1> 	ja	sysret
  3206 0000CAF1 57                  <1> 	push	edi ; start address 
  3207 0000CAF2 50                  <1> 	push	eax ; stop address (included)
  3208                              <1> sysvideo_25:
  3209 0000CAF3 89D1                <1> 	mov	ecx, edx
  3210 0000CAF5 F3A4                <1> 	rep	movsb
  3211 0000CAF7 4F                  <1> 	dec	edi
  3212 0000CAF8 4E                  <1> 	dec	esi
  3213 0000CAF9 01DF                <1> 	add	edi, ebx ; bytes per screen row
  3214 0000CAFB 01DE                <1> 	add	esi, ebx
  3215                              <1> 	;
  3216 0000CAFD 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3217 0000CB00 76F1                <1> 	jna	short sysvideo_25
  3218 0000CB02 5B                  <1> 	pop	ebx ; stop address
  3219 0000CB03 5F                  <1> 	pop	edi ; start address
  3220 0000CB04 29FB                <1> 	sub	ebx, edi
  3221 0000CB06 6643                <1> 	inc	bx
  3222 0000CB08 66891D[E4490100]    <1> 	mov	[u.r0], bx	
  3223 0000CB0F E9A6F2FFFF          <1> 	jmp	sysret
  3224                              <1> 
  3225                              <1> sysvideo_26:
  3226 0000CB14 80FB05              <1> 	cmp	bl, 5
  3227 0000CB17 0F8795000000        <1>         ja      sysvideo_29
  3228                              <1> 
  3229                              <1> 	; BL = 5 = window copy (user to system)
  3230                              <1> 
  3231 0000CB1D B800800B00          <1> 	mov	eax, 0B8000h
  3232 0000CB22 39C7                <1> 	cmp	edi, eax
  3233 0000CB24 0F8290F2FFFF        <1> 	jb	sysret
  3234 0000CB2A 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3235 0000CB2E 39C7                <1> 	cmp	edi, eax
  3236 0000CB30 0F8784F2FFFF        <1> 	ja	sysret
  3237                              <1> 
  3238                              <1> 	; esi = user buffer (in user's memory space)
  3239 0000CB36 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3240 0000CB38 0F865AFEFFFF        <1>         jna     sysvideo_15 ; full screen copy
  3241                              <1> 
  3242 0000CB3E 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3243 0000CB41 6629C8              <1> 	sub	ax, cx  ; - top left column
  3244 0000CB44 0F8270F2FFFF        <1>         jb      sysret ; invalid
  3245 0000CB4A 6640                <1> 	inc	ax ; same column no == 1 column	 
  3246 0000CB4C 50                  <1> 	push	eax ; byte count per window row
  3247                              <1> 
  3248 0000CB4D 52                  <1> 	push	edx
  3249 0000CB4E BB40010000          <1> 	mov	ebx, 320 ; screen width
  3250 0000CB53 89C8                <1> 	mov	eax, ecx
  3251 0000CB55 C1E810              <1> 	shr	eax, 16	; top row
  3252 0000CB58 F7E3                <1> 	mul	ebx
  3253 0000CB5A 6689CA              <1> 	mov	dx, cx ; top left column
  3254 0000CB5D 01D0                <1> 	add	eax, edx
  3255 0000CB5F 01C7                <1> 	add	edi, eax ; start address 
  3256 0000CB61 59                  <1> 	pop	ecx ; edx
  3257 0000CB62 89C8                <1> 	mov	eax, ecx
  3258 0000CB64 C1E810              <1> 	shr	eax, 16 ; bottom row
  3259 0000CB67 F7E3                <1> 	mul	ebx
  3260 0000CB69 6689CA              <1> 	mov	dx, cx ; bottom right column
  3261 0000CB6C 01D0                <1> 	add	eax, edx
  3262 0000CB6E 5A                  <1> 	pop	edx ; byte count per window row
  3263 0000CB6F 0500800B00          <1> 	add	eax, 0B8000h
  3264 0000CB74 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3265 0000CB79 0F873BF2FFFF        <1> 	ja	sysret
  3266 0000CB7F 57                  <1> 	push	edi ; start address 
  3267 0000CB80 50                  <1> 	push	eax ; stop address (included)
  3268                              <1> sysvideo_27:
  3269 0000CB81 89D1                <1> 	mov	ecx, edx ; byte count
  3270                              <1> 	; user to system video/display page window transfer
  3271                              <1> 	; esi =	user buffer
  3272 0000CB83 E862150000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3273 0000CB88 7221                <1> 	jc	short sysvideo_28
  3274 0000CB8A 010D[E4490100]      <1> 	add	[u.r0], ecx
  3275 0000CB90 01DF                <1> 	add	edi, ebx ; next row
  3276 0000CB92 01CE                <1> 	add	esi, ecx
  3277 0000CB94 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3278 0000CB97 76E8                <1> 	jna	short sysvideo_27
  3279 0000CB99 5B                  <1> 	pop	ebx ; stop address
  3280 0000CB9A 5F                  <1> 	pop	edi ; start address
  3281 0000CB9B 29FB                <1> 	sub	ebx, edi
  3282 0000CB9D 6643                <1> 	inc	bx
  3283 0000CB9F 66891D[E4490100]    <1> 	mov	[u.r0], bx	
  3284 0000CBA6 E90FF2FFFF          <1> 	jmp	sysret
  3285                              <1> sysvideo_28:
  3286 0000CBAB 58                  <1> 	pop	eax
  3287 0000CBAC 5A                  <1> 	pop	edx
  3288 0000CBAD E908F2FFFF          <1> 	jmp	sysret
  3289                              <1> 
  3290                              <1> sysvideo_29:
  3291 0000CBB2 80FB06              <1> 	cmp	bl, 6
  3292 0000CBB5 0F8797000000        <1>         ja      sysvideo_32
  3293                              <1> 
  3294                              <1> 	; BL = 6 = window copy (system to user)
  3295                              <1> 
  3296 0000CBBB 89F7                <1> 	mov	edi, esi ; user buffer
  3297                              <1> 
  3298 0000CBBD B800800B00          <1> 	mov	eax, 0B8000h
  3299 0000CBC2 39C6                <1> 	cmp	esi, eax
  3300 0000CBC4 0F82F0F1FFFF        <1> 	jb	sysret
  3301 0000CBCA 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3302 0000CBCE 39C6                <1> 	cmp	esi, eax
  3303 0000CBD0 0F87E4F1FFFF        <1> 	ja	sysret
  3304                              <1> 
  3305                              <1> 	; edi = user buffer (in user's memory space)
  3306 0000CBD6 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3307 0000CBD8 0F86E2FDFFFF        <1>         jna     sysvideo_17 ; full screen copy
  3308                              <1> 
  3309 0000CBDE 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3310 0000CBE1 6629C8              <1> 	sub	ax, cx  ; - top left column
  3311 0000CBE4 0F82D0F1FFFF        <1>         jb      sysret ; invalid
  3312 0000CBEA 6640                <1> 	inc	ax ; same column no == 1 column	 
  3313 0000CBEC 50                  <1> 	push	eax ; byte count per window row
  3314                              <1> 
  3315 0000CBED 52                  <1> 	push	edx
  3316 0000CBEE BB40010000          <1> 	mov	ebx, 320 ; screen width
  3317 0000CBF3 89C8                <1> 	mov	eax, ecx
  3318 0000CBF5 C1E810              <1> 	shr	eax, 16	; top row
  3319 0000CBF8 F7E3                <1> 	mul	ebx
  3320 0000CBFA 6689CA              <1> 	mov	dx, cx ; top left column
  3321 0000CBFD 01D0                <1> 	add	eax, edx
  3322 0000CBFF 01C6                <1> 	add	esi, eax ; start address 
  3323 0000CC01 59                  <1> 	pop	ecx ; edx
  3324 0000CC02 89C8                <1> 	mov	eax, ecx
  3325 0000CC04 C1E810              <1> 	shr	eax, 16 ; bottom row
  3326 0000CC07 F7E3                <1> 	mul	ebx
  3327 0000CC09 6689CA              <1> 	mov	dx, cx ; bottom right column
  3328 0000CC0C 01D0                <1> 	add	eax, edx
  3329 0000CC0E 5A                  <1> 	pop	edx ; byte count per window row
  3330 0000CC0F 0500800B00          <1> 	add	eax, 0B8000h
  3331 0000CC14 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3332 0000CC19 0F879BF1FFFF        <1> 	ja	sysret
  3333 0000CC1F 56                  <1> 	push	esi ; start address 
  3334 0000CC20 50                  <1> 	push	eax ; stop address (included)
  3335                              <1> sysvideo_30:
  3336 0000CC21 89D1                <1> 	mov	ecx, edx ; byte count
  3337                              <1> 	; user to system video/display page window transfer
  3338                              <1> 	; esi =	user buffer
  3339 0000CC23 E878140000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3340 0000CC28 7221                <1> 	jc	short sysvideo_31
  3341 0000CC2A 010D[E4490100]      <1> 	add	[u.r0], ecx
  3342 0000CC30 01DF                <1> 	add	edi, ebx ; next row
  3343 0000CC32 01CE                <1> 	add	esi, ecx
  3344 0000CC34 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3345 0000CC37 76E8                <1> 	jna	short sysvideo_30
  3346 0000CC39 5B                  <1> 	pop	ebx ; stop address
  3347 0000CC3A 5F                  <1> 	pop	edi ; start address
  3348 0000CC3B 29FB                <1> 	sub	ebx, edi
  3349 0000CC3D 6643                <1> 	inc	bx
  3350 0000CC3F 66891D[E4490100]    <1> 	mov	[u.r0], bx	
  3351 0000CC46 E96FF1FFFF          <1> 	jmp	sysret
  3352                              <1> sysvideo_31:
  3353 0000CC4B 58                  <1> 	pop	eax
  3354 0000CC4C 5A                  <1> 	pop	edx
  3355 0000CC4D E968F1FFFF          <1> 	jmp	sysret
  3356                              <1> 
  3357                              <1> sysvideo_32:
  3358 0000CC52 80FB07              <1> 	cmp	bl, 7
  3359 0000CC55 770F                <1> 	ja	short sysvideo_34
  3360                              <1> 
  3361                              <1> 	; BL = 7 = AND display page bytes with CL
  3362                              <1> 
  3363 0000CC57 BE00800B00          <1> 	mov	esi, 0B8000h
  3364 0000CC5C B900800000          <1> 	mov	ecx, 32768
  3365                              <1> sysvideo_33:
  3366 0000CC61 200E                <1> 	and	byte [esi], cl
  3367 0000CC63 46                  <1> 	inc	esi
  3368 0000CC64 E2FB                <1> 	loop	sysvideo_33
  3369                              <1> 
  3370                              <1> sysvideo_34:
  3371 0000CC66 80FB08              <1> 	cmp	bl, 8
  3372 0000CC69 770F                <1> 	ja	short sysvideo_36
  3373                              <1> 
  3374                              <1> 	; BL = 8 = OR display page bytes with CL
  3375                              <1> 
  3376 0000CC6B BE00800B00          <1> 	mov	esi, 0B8000h
  3377 0000CC70 B900800000          <1> 	mov	ecx, 32768
  3378                              <1> sysvideo_35:
  3379 0000CC75 080E                <1> 	or	byte [esi], cl
  3380 0000CC77 46                  <1> 	inc	esi
  3381 0000CC78 E2FB                <1> 	loop	sysvideo_35	
  3382                              <1> 
  3383                              <1> sysvideo_36:
  3384 0000CC7A 80FB09              <1> 	cmp	bl, 9
  3385 0000CC7D 0F8737F1FFFF        <1>         ja      sysret ; nothing to do
  3386                              <1> 
  3387                              <1> 	; BL = 9 = XOR display page bytes with CL
  3388                              <1> 
  3389 0000CC83 BE00800B00          <1> 	mov	esi, 0B8000h
  3390 0000CC88 B900800000          <1> 	mov	ecx, 32768
  3391                              <1> sysvideo_37:
  3392 0000CC8D 300E                <1> 	xor	byte [esi], cl
  3393 0000CC8F 46                  <1> 	inc	esi
  3394 0000CC90 E2FB                <1> 	loop	sysvideo_37
  3395                              <1> 
  3396                              <1> sysvideo_38:
  3397 0000CC92 80FF02              <1> 	cmp	bh, 2
  3398 0000CC95 0F8733030000        <1>         ja      sysvideo_64
  3399                              <1> 	; BH = 2 = VGA Graphics (0A0000h) data transfers
  3400                              <1> 
  3401 0000CC9B 88DC                <1> 	mov	ah, bl
  3402 0000CC9D 80E30F              <1> 	and	bl, 0Fh	
  3403 0000CCA0 C0EC04              <1> 	shr	ah, 4
  3404 0000CCA3 C1E310              <1> 	shl	ebx, 16
  3405 0000CCA6 66BB4001            <1> 	mov	bx, 320 ; 320*200, 320*240
  3406 0000CCAA 20E4                <1> 	and	ah, ah
  3407 0000CCAC 7413                <1> 	jz	short sysvideo_39
  3408 0000CCAE 66D1E3              <1> 	shl	bx, 1 ; 640*200, 640 * 400, 640*480
  3409 0000CCB1 80FC02              <1> 	cmp	ah, 2
  3410 0000CCB4 720B                <1> 	jb	short sysvideo_39 		
  3411 0000CCB6 0F87FEF0FFFF        <1> 	ja	sysret ; invalid
  3412                              <1> 	; 800*600
  3413 0000CCBC 6681C3A000          <1> 	add	bx, 160 ; 800
  3414                              <1> sysvideo_39:
  3415 0000CCC1 C1CB10              <1> 	ror	ebx, 16
  3416                              <1> 		
  3417 0000CCC4 20DB                <1>  	and	bl, bl
  3418 0000CCC6 7519                <1> 	jnz	short sysvideo_40
  3419                              <1> 
  3420                              <1> 	; BL =	0 = Fill color (color in CL] (64K)
  3421                              <1> 
  3422 0000CCC8 88C8                <1> 	mov	al, cl
  3423 0000CCCA B900000100          <1> 	mov	ecx, 65536
  3424 0000CCCF 890D[E4490100]      <1> 	mov	[u.r0], ecx
  3425 0000CCD5 BF00000A00          <1> 	mov	edi, 0A0000h
  3426 0000CCDA F3AB                <1> 	rep	stosd
  3427 0000CCDC E9D9F0FFFF          <1> 	jmp	sysret
  3428                              <1> 
  3429                              <1> sysvideo_40:
  3430 0000CCE1 80FB01              <1> 	cmp	bl, 1
  3431 0000CCE4 7722                <1> 	ja	short sysvideo_42
  3432                              <1> 
  3433 0000CCE6 89CE                <1> 	mov	esi, ecx ; user buffer
  3434                              <1> 	; BL = 1 = user to system video/display page transfer
  3435                              <1> sysvideo_41:	
  3436 0000CCE8 BF00000A00          <1> 	mov	edi, 0A0000h
  3437                              <1> 	; edi = video page address
  3438 0000CCED B900000100          <1> 	mov	ecx, 65536
  3439 0000CCF2 E8F3130000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3440 0000CCF7 0F82BDF0FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3441 0000CCFD 890D[E4490100]      <1> 	mov	[u.r0], ecx		
  3442 0000CD03 E9B2F0FFFF          <1> 	jmp	sysret
  3443                              <1> 
  3444                              <1> sysvideo_42:
  3445 0000CD08 80FB02              <1> 	cmp	bl, 2	
  3446 0000CD0B 7722                <1> 	ja	short sysvideo_44
  3447                              <1> 
  3448 0000CD0D 89CF                <1> 	mov	edi, ecx ; user buffer
  3449                              <1> 	; BL = 2 = system to user video/display page transfer
  3450                              <1> sysvideo_43:	
  3451 0000CD0F BE00000A00          <1> 	mov	esi, 0A0000h
  3452 0000CD14 B900000100          <1> 	mov	ecx, 65536
  3453 0000CD19 E882130000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3454 0000CD1E 0F8296F0FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3455 0000CD24 890D[E4490100]      <1> 	mov	[u.r0], ecx
  3456 0000CD2A E98BF0FFFF          <1> 	jmp	sysret 	
  3457                              <1> 
  3458                              <1> sysvideo_44:
  3459 0000CD2F 80FB03              <1> 	cmp	bl, 3
  3460 0000CD32 777A                <1> 	ja	short sysvideo_49
  3461                              <1> 
  3462                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  3463                              <1> 
  3464 0000CD34 BF00000A00          <1> 	mov	edi, 0A0000h
  3465 0000CD39 89FE                <1> 	mov	esi, edi
  3466                              <1> 	
  3467 0000CD3B 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3468 0000CD3D 770B                <1> 	ja	short sysvideo_45 ; window
  3469                              <1> 	; full screen (update)
  3470 0000CD3F B900000100          <1> 	mov	ecx, 65536
  3471 0000CD44 890D[E4490100]      <1> 	mov	[u.r0], ecx
  3472                              <1> sysvideo_45:
  3473 0000CD4A F616                <1> 	not	byte [esi] ; NOT operation
  3474 0000CD4C 46                  <1> 	inc	esi
  3475 0000CD4D E2FB                <1> 	loop	sysvideo_45
  3476 0000CD4F E966F0FFFF          <1> 	jmp	sysret
  3477                              <1> sysvideo_46:
  3478 0000CD54 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3479 0000CD57 6629C8              <1> 	sub	ax, cx  ; - top left column
  3480 0000CD5A 0F825AF0FFFF        <1>         jb      sysret ; invalid
  3481 0000CD60 6640                <1> 	inc	ax ; same column no == 1 column	 
  3482 0000CD62 50                  <1> 	push	eax ; byte count per window row
  3483 0000CD63 52                  <1> 	push	edx
  3484 0000CD64 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3485 0000CD67 89C8                <1> 	mov	eax, ecx
  3486 0000CD69 C1E810              <1> 	shr	eax, 16  ; top row
  3487 0000CD6C F7E3                <1> 	mul	ebx
  3488 0000CD6E 6689CA              <1> 	mov	dx, cx ; top left column
  3489 0000CD71 01D0                <1> 	add	eax, edx
  3490 0000CD73 01C6                <1> 	add	esi, eax ; start address 
  3491 0000CD75 59                  <1> 	pop	ecx ; edx
  3492 0000CD76 89C8                <1> 	mov	eax, ecx
  3493 0000CD78 C1E810              <1> 	shr	eax, 16 ; bottom row
  3494 0000CD7B F7E3                <1> 	mul	ebx
  3495 0000CD7D 6689CA              <1> 	mov	dx, cx ; bottom right column
  3496 0000CD80 01D0                <1> 	add	eax, edx
  3497 0000CD82 01C7                <1> 	add	edi, eax ; stop address (included)
  3498 0000CD84 5A                  <1> 	pop	edx ; byte count per window row
  3499 0000CD85 81FFFFFF0A00        <1> 	cmp	edi, 0AFFFFh
  3500 0000CD8B 0F8729F0FFFF        <1> 	ja	sysret	
  3501 0000CD91 56                  <1> 	push	esi
  3502 0000CD92 4E                  <1> 	dec	esi
  3503                              <1> sysvideo_47:
  3504 0000CD93 89D1                <1> 	mov	ecx, edx
  3505                              <1> sysvideo_48:
  3506 0000CD95 46                  <1> 	inc	esi
  3507 0000CD96 F616                <1> 	not	byte [esi]
  3508 0000CD98 E2FB                <1> 	loop	sysvideo_48
  3509 0000CD9A 01DE                <1> 	add	esi, ebx ; bytes per screen row
  3510                              <1> 	;
  3511 0000CD9C 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  3512 0000CD9E 76F3                <1> 	jna	short sysvideo_47
  3513 0000CDA0 5E                  <1> 	pop	esi
  3514 0000CDA1 29F7                <1> 	sub	edi, esi
  3515 0000CDA3 893D[E4490100]      <1> 	mov	[u.r0], edi
  3516 0000CDA9 E90CF0FFFF          <1> 	jmp	sysret
  3517                              <1> 
  3518                              <1> sysvideo_49:
  3519 0000CDAE 80FB04              <1> 	cmp	bl, 4
  3520 0000CDB1 0F87A1000000        <1>         ja      sysvideo_52
  3521                              <1> 
  3522                              <1> 	; BL = 4 = window copy (system to system)
  3523                              <1> 
  3524 0000CDB7 B800000A00          <1> 	mov	eax, 0A0000h
  3525 0000CDBC 39C6                <1> 	cmp	esi, eax
  3526 0000CDBE 0F82F6EFFFFF        <1> 	jb	sysret
  3527 0000CDC4 39C7                <1> 	cmp	edi, eax
  3528 0000CDC6 0F82EEEFFFFF        <1> 	jb	sysret
  3529 0000CDCC 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3530 0000CDD0 39C6                <1> 	cmp	esi, eax
  3531 0000CDD2 0F87E2EFFFFF        <1> 	ja	sysret
  3532 0000CDD8 39C7                <1> 	cmp	edi, eax
  3533 0000CDDA 0F87DAEFFFFF        <1> 	ja	sysret
  3534                              <1> 	
  3535 0000CDE0 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3536 0000CDE2 7712                <1> 	ja	short sysvideo_50 ; window
  3537                              <1> 	; full screen copy
  3538 0000CDE4 89C1                <1> 	mov	ecx, eax
  3539 0000CDE6 29F9                <1> 	sub	ecx, edi
  3540 0000CDE8 41                  <1> 	inc	ecx
  3541 0000CDE9 890D[E4490100]      <1> 	mov	[u.r0], ecx
  3542 0000CDEF F3A4                <1> 	rep	movsb
  3543 0000CDF1 E9C4EFFFFF          <1> 	jmp	sysret
  3544                              <1> sysvideo_50:
  3545 0000CDF6 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3546 0000CDF9 6629C8              <1> 	sub	ax, cx  ; - top left column
  3547 0000CDFC 0F82B8EFFFFF        <1>         jb      sysret ; invalid
  3548 0000CE02 6640                <1> 	inc	ax ; same column no == 1 column	 
  3549 0000CE04 50                  <1> 	push	eax ; byte count per window row
  3550                              <1> 	;
  3551 0000CE05 52                  <1> 	push	edx
  3552 0000CE06 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3553 0000CE09 89C8                <1> 	mov	eax, ecx
  3554 0000CE0B C1E810              <1> 	shr	eax, 16	; top row
  3555 0000CE0E F7E3                <1> 	mul	ebx
  3556 0000CE10 6689CA              <1> 	mov	dx, cx ; top left column
  3557 0000CE13 01D0                <1> 	add	eax, edx
  3558 0000CE15 01C7                <1> 	add	edi, eax ; start address 
  3559 0000CE17 01C6                <1> 	add	esi, eax
  3560 0000CE19 59                  <1> 	pop	ecx ; edx
  3561 0000CE1A 89C8                <1> 	mov	eax, ecx
  3562 0000CE1C C1E810              <1> 	shr	eax, 16 ; bottom row
  3563 0000CE1F F7E3                <1> 	mul	ebx
  3564 0000CE21 6689CA              <1> 	mov	dx, cx ; bottom right column
  3565 0000CE24 01D0                <1> 	add	eax, edx
  3566 0000CE26 5A                  <1> 	pop	edx ; byte count per window row
  3567 0000CE27 0500000A00          <1> 	add	eax, 0A0000h
  3568 0000CE2C 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3569 0000CE31 0F8783EFFFFF        <1> 	ja	sysret
  3570 0000CE37 57                  <1> 	push	edi ; start address 
  3571 0000CE38 50                  <1> 	push	eax ; stop address (included)
  3572                              <1> sysvideo_51:
  3573 0000CE39 89D1                <1> 	mov	ecx, edx
  3574 0000CE3B F3A4                <1> 	rep	movsb
  3575 0000CE3D 4F                  <1> 	dec	edi
  3576 0000CE3E 4E                  <1> 	dec	esi
  3577 0000CE3F 01DF                <1> 	add	edi, ebx ; bytes per screen row
  3578 0000CE41 01DE                <1> 	add	esi, ebx
  3579                              <1> 	;
  3580 0000CE43 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3581 0000CE46 76F1                <1> 	jna	short sysvideo_51
  3582 0000CE48 5B                  <1> 	pop	ebx ; stop address
  3583 0000CE49 5F                  <1> 	pop	edi ; start address
  3584 0000CE4A 29FB                <1> 	sub	ebx, edi
  3585 0000CE4C 43                  <1> 	inc	ebx
  3586 0000CE4D 891D[E4490100]      <1> 	mov	[u.r0], ebx	
  3587 0000CE53 E962EFFFFF          <1> 	jmp	sysret
  3588                              <1> 
  3589                              <1> sysvideo_52:
  3590 0000CE58 80FB05              <1> 	cmp	bl, 5
  3591 0000CE5B 0F8791000000        <1>         ja      sysvideo_55
  3592                              <1> 
  3593                              <1> 	; BL = 5 = window copy (user to system)
  3594                              <1> 
  3595 0000CE61 B800000A00          <1> 	mov	eax, 0A0000h
  3596 0000CE66 39C7                <1> 	cmp	edi, eax
  3597 0000CE68 0F824CEFFFFF        <1> 	jb	sysret
  3598 0000CE6E 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3599 0000CE72 39C7                <1> 	cmp	edi, eax
  3600 0000CE74 0F8740EFFFFF        <1> 	ja	sysret
  3601                              <1> 
  3602                              <1> 	; esi = user buffer (in user's memory space)
  3603 0000CE7A 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3604 0000CE7C 0F8666FEFFFF        <1>         jna     sysvideo_41 ; full screen copy
  3605                              <1> 
  3606 0000CE82 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3607 0000CE85 6629C8              <1> 	sub	ax, cx  ; - top left column
  3608 0000CE88 0F822CEFFFFF        <1>         jb      sysret ; invalid
  3609 0000CE8E 6640                <1> 	inc	ax ; same column no == 1 column	 
  3610 0000CE90 50                  <1> 	push	eax ; byte count per window row
  3611                              <1> 
  3612 0000CE91 52                  <1> 	push	edx
  3613 0000CE92 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3614 0000CE95 89C8                <1> 	mov	eax, ecx
  3615 0000CE97 C1E810              <1> 	shr	eax, 16	; top row
  3616 0000CE9A F7E3                <1> 	mul	ebx
  3617 0000CE9C 6689CA              <1> 	mov	dx, cx ; top left column
  3618 0000CE9F 01D0                <1> 	add	eax, edx
  3619 0000CEA1 01C7                <1> 	add	edi, eax ; start address 
  3620 0000CEA3 59                  <1> 	pop	ecx ; edx
  3621 0000CEA4 89C8                <1> 	mov	eax, ecx
  3622 0000CEA6 C1E810              <1> 	shr	eax, 16 ; bottom row
  3623 0000CEA9 F7E3                <1> 	mul	ebx
  3624 0000CEAB 6689CA              <1> 	mov	dx, cx ; bottom right column
  3625 0000CEAE 01D0                <1> 	add	eax, edx
  3626 0000CEB0 5A                  <1> 	pop	edx ; byte count per window row
  3627 0000CEB1 0500000A00          <1> 	add	eax, 0A0000h
  3628 0000CEB6 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3629 0000CEBB 0F87F9EEFFFF        <1> 	ja	sysret
  3630 0000CEC1 57                  <1> 	push	edi ; start address 
  3631 0000CEC2 50                  <1> 	push	eax ; stop address (included)
  3632                              <1> sysvideo_53:
  3633 0000CEC3 89D1                <1> 	mov	ecx, edx ; byte count
  3634                              <1> 	; user to system video/display page window transfer
  3635                              <1> 	; esi =	user buffer
  3636 0000CEC5 E820120000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3637 0000CECA 721F                <1> 	jc	short sysvideo_54
  3638 0000CECC 010D[E4490100]      <1> 	add	[u.r0], ecx
  3639 0000CED2 01DF                <1> 	add	edi, ebx ; next row
  3640 0000CED4 01CE                <1> 	add	esi, ecx
  3641 0000CED6 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3642 0000CED9 76E8                <1> 	jna	short sysvideo_53
  3643 0000CEDB 5B                  <1> 	pop	ebx ; stop address
  3644 0000CEDC 5F                  <1> 	pop	edi ; start address
  3645 0000CEDD 29FB                <1> 	sub	ebx, edi
  3646 0000CEDF 43                  <1> 	inc	ebx
  3647 0000CEE0 891D[E4490100]      <1> 	mov	[u.r0], ebx	
  3648 0000CEE6 E9CFEEFFFF          <1> 	jmp	sysret
  3649                              <1> sysvideo_54:
  3650 0000CEEB 58                  <1> 	pop	eax
  3651 0000CEEC 5A                  <1> 	pop	edx
  3652 0000CEED E9C8EEFFFF          <1> 	jmp	sysret
  3653                              <1> 
  3654                              <1> sysvideo_55:
  3655 0000CEF2 80FB06              <1> 	cmp	bl, 6
  3656 0000CEF5 0F8793000000        <1>         ja      sysvideo_58
  3657                              <1> 
  3658                              <1> 	; BL = 6 = window copy (system to user)
  3659                              <1> 
  3660 0000CEFB 89F7                <1> 	mov	edi, esi ; user buffer
  3661                              <1> 
  3662 0000CEFD B800000A00          <1> 	mov	eax, 0A0000h
  3663 0000CF02 39C6                <1> 	cmp	esi, eax
  3664 0000CF04 0F82B0EEFFFF        <1> 	jb	sysret
  3665 0000CF0A 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3666 0000CF0E 39C6                <1> 	cmp	esi, eax
  3667 0000CF10 0F87A4EEFFFF        <1> 	ja	sysret
  3668                              <1> 
  3669                              <1> 	; edi = user buffer (in user's memory space)
  3670 0000CF16 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3671 0000CF18 0F86A2FAFFFF        <1>         jna     sysvideo_17 ; full screen copy
  3672                              <1> 
  3673 0000CF1E 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3674 0000CF21 6629C8              <1> 	sub	ax, cx  ; - top left column
  3675 0000CF24 0F8290EEFFFF        <1>         jb      sysret ; invalid
  3676 0000CF2A 6640                <1> 	inc	ax ; same column no == 1 column	 
  3677 0000CF2C 50                  <1> 	push	eax ; byte count per window row
  3678                              <1> 
  3679 0000CF2D 52                  <1> 	push	edx
  3680 0000CF2E C1EB10              <1> 	shr	ebx, 16 ; 320, 640,800 ; screen width
  3681 0000CF31 89C8                <1> 	mov	eax, ecx
  3682 0000CF33 C1E810              <1> 	shr	eax, 16	; top row
  3683 0000CF36 F7E3                <1> 	mul	ebx
  3684 0000CF38 6689CA              <1> 	mov	dx, cx ; top left column
  3685 0000CF3B 01D0                <1> 	add	eax, edx
  3686 0000CF3D 01C6                <1> 	add	esi, eax ; start address 
  3687 0000CF3F 59                  <1> 	pop	ecx ; edx
  3688 0000CF40 89C8                <1> 	mov	eax, ecx
  3689 0000CF42 C1E810              <1> 	shr	eax, 16 ; bottom row
  3690 0000CF45 F7E3                <1> 	mul	ebx
  3691 0000CF47 6689CA              <1> 	mov	dx, cx ; bottom right column
  3692 0000CF4A 01D0                <1> 	add	eax, edx
  3693 0000CF4C 5A                  <1> 	pop	edx ; byte count per window row
  3694 0000CF4D 0500000A00          <1> 	add	eax, 0A0000h
  3695 0000CF52 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3696 0000CF57 0F875DEEFFFF        <1> 	ja	sysret
  3697 0000CF5D 56                  <1> 	push	esi ; start address 
  3698 0000CF5E 50                  <1> 	push	eax ; stop address (included)
  3699                              <1> sysvideo_56:
  3700 0000CF5F 89D1                <1> 	mov	ecx, edx ; byte count
  3701                              <1> 	; user to system video/display page window transfer
  3702                              <1> 	; esi =	user buffer
  3703 0000CF61 E83A110000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3704 0000CF66 721F                <1> 	jc	short sysvideo_57
  3705 0000CF68 010D[E4490100]      <1> 	add	[u.r0], ecx
  3706 0000CF6E 01DF                <1> 	add	edi, ebx ; next row
  3707 0000CF70 01CE                <1> 	add	esi, ecx
  3708 0000CF72 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3709 0000CF75 76E8                <1> 	jna	short sysvideo_56
  3710 0000CF77 5B                  <1> 	pop	ebx ; stop address
  3711 0000CF78 5F                  <1> 	pop	edi ; start address
  3712 0000CF79 29FB                <1> 	sub	ebx, edi
  3713 0000CF7B 43                  <1> 	inc	ebx
  3714 0000CF7C 891D[E4490100]      <1> 	mov	[u.r0], ebx	
  3715 0000CF82 E933EEFFFF          <1> 	jmp	sysret
  3716                              <1> sysvideo_57:
  3717 0000CF87 58                  <1> 	pop	eax
  3718 0000CF88 5A                  <1> 	pop	edx
  3719 0000CF89 E92CEEFFFF          <1> 	jmp	sysret
  3720                              <1> 
  3721                              <1> sysvideo_58:
  3722 0000CF8E 80FB07              <1> 	cmp	bl, 7
  3723 0000CF91 770F                <1> 	ja	short sysvideo_60
  3724                              <1> 
  3725                              <1> 	; BL = 7 = AND display page bytes with CL
  3726                              <1> 
  3727 0000CF93 BE00000A00          <1> 	mov	esi, 0A0000h
  3728 0000CF98 B900000100          <1> 	mov	ecx, 65536
  3729                              <1> sysvideo_59:
  3730 0000CF9D 200E                <1> 	and	byte [esi], cl
  3731 0000CF9F 46                  <1> 	inc	esi
  3732 0000CFA0 E2FB                <1> 	loop	sysvideo_59
  3733                              <1> 
  3734                              <1> sysvideo_60:
  3735 0000CFA2 80FB08              <1> 	cmp	bl, 8
  3736 0000CFA5 770F                <1> 	ja	short sysvideo_62
  3737                              <1> 
  3738                              <1> 	; BL = 8 = OR display page bytes with CL
  3739                              <1> 
  3740 0000CFA7 BE00000A00          <1> 	mov	esi, 0A0000h
  3741 0000CFAC B900000100          <1> 	mov	ecx, 65536
  3742                              <1> sysvideo_61:
  3743 0000CFB1 080E                <1> 	or	byte [esi], cl
  3744 0000CFB3 46                  <1> 	inc	esi
  3745 0000CFB4 E2FB                <1> 	loop	sysvideo_61	
  3746                              <1> 
  3747                              <1> sysvideo_62:
  3748 0000CFB6 80FB09              <1> 	cmp	bl, 9
  3749 0000CFB9 0F87FBEDFFFF        <1>         ja      sysret ; nothing to do
  3750                              <1> 
  3751                              <1> 	; BL = 9 = XOR display page bytes with CL
  3752                              <1> 
  3753 0000CFBF BE00000A00          <1> 	mov	esi, 0A0000h
  3754 0000CFC4 B900000100          <1> 	mov	ecx, 65536
  3755                              <1> sysvideo_63:
  3756 0000CFC9 300E                <1> 	xor	byte [esi], cl
  3757 0000CFCB 46                  <1> 	inc	esi
  3758 0000CFCC E2FB                <1> 	loop	sysvideo_63
  3759                              <1> 
  3760                              <1> sysvideo_64:
  3761 0000CFCE 80FF03              <1> 	cmp	bh, 3
  3762 0000CFD1 7460                <1> 	je	short sysvideo_68
  3763 0000CFD3 80FF04              <1> 	cmp	bh, 4
  3764 0000CFD6 771F                <1> 	ja	short sysvideo_65
  3765                              <1> 	
  3766                              <1> 	; BH = 4
  3767                              <1> 	; Direct User Access for CGA video memory.
  3768                              <1> 	; Setup user's page tables for direct access to 0B8000h.
  3769                              <1> 	;
  3770                              <1> 	; Permission checks are not implemented yet !
  3771                              <1> 	; (11/07/2016)
  3772                              <1> 
  3773 0000CFD8 B800800B00          <1> 	mov	eax, 0B8000h
  3774 0000CFDD B908000000          <1> 	mov	ecx, 8 ; 8 pages (8*4K=32K)
  3775 0000CFE2 E88A86FFFF          <1> 	call	direct_memory_access	
  3776 0000CFE7 0F82CDEDFFFF        <1> 	jc	sysret
  3777                              <1> 	; eax = 0B8000h if there is not an error
  3778 0000CFED A3[E4490100]        <1> 	mov	[u.r0], eax
  3779 0000CFF2 E9C3EDFFFF          <1> 	jmp	sysret
  3780                              <1> 
  3781                              <1> sysvideo_65:
  3782 0000CFF7 80FF05              <1> 	cmp	bh, 5
  3783 0000CFFA 771F                <1> 	ja	short sysvideo_66
  3784                              <1> 
  3785                              <1> 	; BH = 5
  3786                              <1> 	; Direct User Access for VGA video memory.
  3787                              <1> 	; Setup user's page tables for direct access to 0A0000h.
  3788                              <1> 	;
  3789                              <1> 	; Permission checks are not implemented yet !
  3790                              <1> 	; (11/07/2016)
  3791                              <1> 
  3792 0000CFFC B800000A00          <1> 	mov	eax, 0A0000h
  3793 0000D001 B910000000          <1> 	mov	ecx, 16 ; 16 pages (16*4K=64K)
  3794 0000D006 E86686FFFF          <1> 	call	direct_memory_access	
  3795 0000D00B 0F82A9EDFFFF        <1> 	jc	sysret
  3796                              <1> 	; eax = 0A0000h if there is not an error
  3797 0000D011 A3[E4490100]        <1> 	mov	[u.r0], eax
  3798 0000D016 E99FEDFFFF          <1> 	jmp	sysret
  3799                              <1> 
  3800                              <1> sysvideo_66:
  3801 0000D01B 80FF06              <1> 	cmp	bh, 6
  3802 0000D01E 7705                <1> 	ja	short sysvideo_67
  3803                              <1> 	; BH = 6
  3804                              <1> 	; Direct User Access for (Super VGA) Linear Frame Buffer.
  3805                              <1> 	; Setup user's page tables for direct access to LFB.
  3806                              <1> 	;
  3807                              <1> 	; Not implemented yet !
  3808                              <1> 	; (11/07/2016)
  3809 0000D020 E995EDFFFF          <1> 	jmp	sysret
  3810                              <1> 
  3811                              <1> sysvideo_67:
  3812 0000D025 80FF07              <1> 	cmp	bh, 7
  3813 0000D028 0F878CEDFFFF        <1> 	ja	sysret ; invalid !
  3814                              <1> 
  3815                              <1> 	; BH = 7
  3816                              <1> 	; Get (Super/Extended VGA) Linear Frame Buffer info.
  3817                              <1> 	;
  3818                              <1> 	; Not implemented yet !
  3819                              <1> 	; (11/07/2016)
  3820 0000D02E E987EDFFFF          <1> 	jmp	sysret
  3821                              <1> 
  3822                              <1> sysvideo_68:
  3823                              <1> 	; BH = 3
  3824                              <1> 	; Super VGA, LINEAR FRAME BUFFER data transfers
  3825                              <1> 	; Not implemented for yet ! (11/07/2016)
  3826 0000D033 E982EDFFFF          <1> 	jmp	sysret
  3827                              <1> 
  3828                              <1> sysaudio: ; AUDIO FUNCTIONS
  3829                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  3830                              <1> 	;
  3831                              <1> 	; Inputs:
  3832                              <1> 	;	BH = 0 -> Beep (PC Speaker)
  3833                              <1> 	;	     BL = Duration Counter (1 for 1/64 second)
  3834                              <1> 	;	     CX = Frequency Divisor (1193180/Frequency)
  3835                              <1> 	;		 (1331 for 886 Hz)			
  3836                              <1> 	;
  3837                              <1> 	; Outputs:
  3838                              <1> 	;	none
  3839                              <1> 	;
  3840 0000D038 20FF                <1> 	and	bh, bh
  3841 0000D03A 0F857AEDFFFF        <1> 	jnz	sysret
  3842 0000D040 E84D4DFFFF          <1> 	call	beep
  3843 0000D045 E970EDFFFF          <1> 	jmp	sysret
  3844                              <1>  
  3845                              <1> syslink:
  3846                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  3847                              <1> 	; temporary !
  3848 0000D04A B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  3849 0000D04F A3[484A0100]        <1>         mov     [u.error], eax
  3850 0000D054 A3[E4490100]        <1>         mov     [u.r0], eax 
  3851 0000D059 E93CEDFFFF          <1> 	jmp	error
  3852                              <1> 
  3853                              <1> isdir:
  3854                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  3855                              <1> 	; 04/05/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  3856                              <1> 	;
  3857                              <1> 	; 'isdir' check to see if the i-node whose i-number is in r1
  3858                              <1> 	;  is a directory. If it is, an error occurs, because 'isdir'
  3859                              <1> 	;  called by syslink and sysunlink to make sure directories
  3860                              <1> 	;  are not linked. If the user is the super user (u.uid=0),
  3861                              <1> 	; 'isdir' does not bother checking. The current i-node
  3862                              <1> 	;  is not disturbed.			
  3863                              <1> 	;		
  3864                              <1> 	; INPUTS ->
  3865                              <1> 	;    r1 - contains the i-number whose i-node is being checked.
  3866                              <1> 	;    u.uid - user id
  3867                              <1> 	; OUTPUTS ->
  3868                              <1> 	;    r1 - contains current i-number upon exit
  3869                              <1> 	;    	 (current i-node back in core) 
  3870                              <1> 	;	
  3871                              <1> 	; ((AX = R1))
  3872                              <1> 	;
  3873                              <1>         ; ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
  3874                              <1> 	;
  3875                              <1> 
  3876                              <1> 	; / if the i-node whose i-number is in r1 is a directory 
  3877                              <1> 	; / there is an error unless super user made the call
  3878                              <1> 	
  3879 0000D05E 803D[304A0100]00    <1> 	cmp	byte [u.uid], 0 
  3880                              <1> 		; tstb u.uid / super user
  3881 0000D065 762D                <1> 	jna	short isdir1
  3882                              <1> 		; beq 1f / yes, don't care
  3883 0000D067 66FF35[6D4A0100]    <1> 	push	word [ii]
  3884                              <1> 		; mov ii,-(sp) / put current i-number on stack
  3885 0000D06E E8ED180000          <1> 	call	iget
  3886                              <1> 		; jsr r0,iget / get i-node into core (i-number in r1)
  3887 0000D073 66F705[80460100]00- <1> 	test 	word [i.flgs], 4000h ; Bit 14 : Directory flag
  3887 0000D07B 40                  <1>
  3888                              <1> 		; bit $40000,i.flgs / is it a directory
  3889                              <1> 	;jnz	error
  3890                              <1> 		; bne error9 / yes, error
  3891 0000D07C 740F                <1> 	jz	short isdir0
  3892 0000D07E C705[484A0100]0B00- <1> 	mov 	dword [u.error], ERR_NOT_FILE  ; 11 ; ERR_DIR_ACCESS 
  3892 0000D086 0000                <1>
  3893                              <1> 				; 'permission denied !' error
  3894                              <1> 	; pop	ax
  3895 0000D088 E90DEDFFFF          <1> 	jmp	error	
  3896                              <1> isdir0:	
  3897 0000D08D 6658                <1> 	pop	ax
  3898                              <1> 		; mov (sp)+,r1 / no, put current i-number in r1 (ii)
  3899 0000D08F E8CC180000          <1> 	call	iget
  3900                              <1> 		; jsr r0,iget / get it back in
  3901                              <1> isdir1: ; 1:
  3902 0000D094 C3                  <1> 	retn
  3903                              <1> 		; rts r0
  3904                              <1> 
  3905                              <1> sysunlink:
  3906                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  3907                              <1> 	; temporary !
  3908 0000D095 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  3909 0000D09A A3[484A0100]        <1>         mov     [u.error], eax
  3910 0000D09F A3[E4490100]        <1>         mov     [u.r0], eax 
  3911 0000D0A4 E9F1ECFFFF          <1> 	jmp	error
  3912                              <1> mkdir:
  3913                              <1> 	; 04/12/2015 (14 byte directory names)
  3914                              <1> 	; 12/10/2015
  3915                              <1> 	; 17/06/2015 (Retro UNIX 386 v1 - Beginning)
  3916                              <1> 	; 29/04/2013 - 01/08/2013 (Retro UNIX 8086 v1)
  3917                              <1> 	;
  3918                              <1> 	; 'mkdir' makes a directory entry from the name pointed to
  3919                              <1> 	; by u.namep into the current directory.
  3920                              <1> 	;
  3921                              <1> 	; INPUTS ->
  3922                              <1> 	;    u.namep - points to a file name 
  3923                              <1> 	;	           that is about to be a directory entry.
  3924                              <1> 	;    ii - current directory's i-number.	
  3925                              <1> 	; OUTPUTS ->
  3926                              <1> 	;    u.dirbuf+2 - u.dirbuf+10 - contains file name. 
  3927                              <1> 	;    u.off - points to entry to be filled 
  3928                              <1> 	;	     in the current directory		
  3929                              <1> 	;    u.base - points to start of u.dirbuf.
  3930                              <1> 	;    r1 - contains i-number of current directory 
  3931                              <1> 	;	
  3932                              <1> 	; ((AX = R1)) output
  3933                              <1> 	;
  3934                              <1> 	;    (Retro UNIX Prototype : 11/11/2012, UNIXCOPY.ASM)
  3935                              <1>         ;    ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
  3936                              <1> 	;
  3937                              <1> 
  3938                              <1> 	; 17/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
  3939 0000D0A9 31C0                <1> 	xor 	eax, eax
  3940 0000D0AB BF[1A4A0100]        <1> 	mov     edi, u.dirbuf+2
  3941 0000D0B0 89FE                <1> 	mov	esi, edi
  3942 0000D0B2 AB                  <1> 	stosd
  3943 0000D0B3 AB                  <1> 	stosd
  3944                              <1> 	; 04/12/2015 (14 byte directory names)
  3945 0000D0B4 AB                  <1> 	stosd
  3946 0000D0B5 66AB                <1> 	stosw
  3947                              <1> 		; jsr r0,copyz; u.dirbuf+2; u.dirbuf+10. / clear this
  3948 0000D0B7 89F7                <1> 	mov	edi, esi ; offset to u.dirbuf
  3949                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
  3950                              <1> 	;mov 	ebp, [u.namep]
  3951 0000D0B9 E829040000          <1> 	call	trans_addr_nmbp ; convert virtual address to physical
  3952                              <1> 		; esi = physical address (page start + offset)
  3953                              <1> 		; ecx = byte count in the page (1 - 4096)
  3954                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
  3955                              <1> 		; mov u.namep,r2 / r2 points to name of directory entry
  3956                              <1> 		; mov $u.dirbuf+2,r3 / r3 points to u.dirbuf+2
  3957                              <1> mkdir_1: ; 1: 
  3958 0000D0BE 45                  <1> 	inc	ebp ; 12/10/2015
  3959                              <1> 	;
  3960                              <1> 	; / put characters in the directory name in u.dirbuf+2 - u.dirbuf+10
  3961                              <1> 	 ; 01/08/2013
  3962 0000D0BF AC                  <1> 	lodsb
  3963                              <1> 		; movb (r2)+,r1 / move character in name to r1
  3964 0000D0C0 20C0                <1> 	and 	al, al
  3965 0000D0C2 7427                <1> 	jz 	short mkdir_3 	  
  3966                              <1> 		; beq 1f / if null, done
  3967 0000D0C4 3C2F                <1> 	cmp	al, '/'
  3968                              <1> 		; cmp r1,$'/ / is it a "/"?
  3969 0000D0C6 7414                <1> 	je	short mkdir_err
  3970                              <1> 	;je	error
  3971                              <1> 		; beq error9 / yes, error
  3972                              <1> 	; 12/10/2015
  3973 0000D0C8 6649                <1> 	dec	cx
  3974 0000D0CA 7505                <1> 	jnz	short mkdir_2
  3975                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
  3976 0000D0CC E81C040000          <1> 	call	trans_addr_nm ; convert virtual address to physical
  3977                              <1> 		; esi = physical address (page start + offset)
  3978                              <1> 		; ecx = byte count in the page
  3979                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
  3980                              <1> mkdir_2:
  3981 0000D0D1 81FF[284A0100]      <1> 	cmp     edi, u.dirbuf+16 ; ; 04/12/2015 (10 -> 16) 
  3982                              <1> 		; cmp r3,$u.dirbuf+10. / have we reached the last slot for
  3983                              <1> 				     ; / a char?
  3984 0000D0D7 74E5                <1> 	je	short mkdir_1
  3985                              <1> 		; beq 1b / yes, go back
  3986 0000D0D9 AA                  <1> 	stosb
  3987                              <1> 		; movb r1,(r3)+ / no, put the char in the u.dirbuf
  3988 0000D0DA EBE2                <1> 	jmp 	short mkdir_1
  3989                              <1> 		; br 1b / get next char
  3990                              <1> mkdir_err:
  3991                              <1> 	; 17/06/2015
  3992 0000D0DC C705[484A0100]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a valid directory !'
  3992 0000D0E4 0000                <1>
  3993 0000D0E6 E9AFECFFFF          <1> 	jmp	error
  3994                              <1> 
  3995                              <1> mkdir_3: ; 1:
  3996 0000D0EB A1[F8490100]        <1> 	mov	eax, [u.dirp]
  3997 0000D0F0 A3[004A0100]        <1> 	mov	[u.off], eax
  3998                              <1> 		; mov u.dirp,u.off / pointer to empty current directory
  3999                              <1> 				 ; / slot to u.off
  4000                              <1> wdir: ; 29/04/2013
  4001 0000D0F5 C705[044A0100]-     <1>         mov     dword [u.base], u.dirbuf
  4001 0000D0FB [184A0100]          <1>
  4002                              <1> 		; mov $u.dirbuf,u.base / u.base points to created file name
  4003 0000D0FF C705[084A0100]1000- <1>         mov     dword [u.count], 16 ; 04/12/2015 (10 -> 16) 
  4003 0000D107 0000                <1>
  4004                              <1> 		; mov $10.,u.count / u.count = 10
  4005 0000D109 66A1[6D4A0100]      <1> 	mov	ax, [ii] 
  4006                              <1> 		; mov ii,r1 / r1 has i-number of current directory
  4007 0000D10F B201                <1> 	mov	dl, 1 ; owner flag mask ; RETRO UNIX 8086 v1 modification !
  4008 0000D111 E850180000          <1> 	call 	access
  4009                              <1> 		; jsr r0,access; 1 / get i-node and set its file up 
  4010                              <1> 				 ; / for writing
  4011                              <1> 	; AX = i-number of current directory
  4012                              <1> 	; 01/08/2013
  4013 0000D116 FE05[464A0100]      <1> 	inc     byte [u.kcall] ; the caller is 'mkdir' sign	
  4014 0000D11C E8E1110000          <1> 	call	writei
  4015                              <1> 		; jsr r0,writei / write into directory
  4016 0000D121 C3                  <1> 	retn	
  4017                              <1> 		; rts r0
  4018                              <1> 
  4019                              <1> sysexec:
  4020                              <1> 	; 04/01/2017
  4021                              <1> 	; 24/10/2016
  4022                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
  4023                              <1> 	; 23/06/2015 - 23/10/2015 (Retro UNIX 386 v1)
  4024                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
  4025                              <1> 	;
  4026                              <1> 	; 'sysexec' initiates execution of a file whose path name if
  4027                              <1> 	; pointed to by 'name' in the sysexec call. 
  4028                              <1> 	; 'sysexec' performs the following operations:
  4029                              <1> 	;    1. obtains i-number of file to be executed via 'namei'.
  4030                              <1> 	;    2. obtains i-node of file to be exceuted via 'iget'.
  4031                              <1> 	;    3. sets trap vectors to system routines.
  4032                              <1> 	;    4. loads arguments to be passed to executing file into
  4033                              <1> 	;	highest locations of user's core
  4034                              <1> 	;    5. puts pointers to arguments in locations immediately
  4035                              <1> 	;	following arguments.
  4036                              <1> 	;    6.	saves number of arguments in next location.
  4037                              <1> 	;    7. intializes user's stack area so that all registers
  4038                              <1> 	;	will be zeroed and the PS is cleared and the PC set
  4039                              <1> 	;	to core when 'sysret' restores registers 
  4040                              <1> 	;	and does an rti.
  4041                              <1> 	;    8. inializes u.r0 and u.sp
  4042                              <1> 	;    9. zeros user's core down to u.r0
  4043                              <1> 	;   10.	reads executable file from storage device into core
  4044                              <1> 	;	starting at location 'core'.
  4045                              <1> 	;   11.	sets u.break to point to end of user's code with
  4046                              <1> 	;	data area appended.
  4047                              <1> 	;   12.	calls 'sysret' which returns control at location
  4048                              <1> 	;	'core' via 'rti' instruction. 		  		
  4049                              <1> 	;
  4050                              <1> 	; Calling sequence:
  4051                              <1> 	;	sysexec; namep; argp
  4052                              <1> 	; Arguments:
  4053                              <1> 	;	namep - points to pathname of file to be executed
  4054                              <1> 	;	argp  - address of table of argument pointers
  4055                              <1> 	;	argp1... argpn - table of argument pointers
  4056                              <1> 	;	argp1:<...0> ... argpn:<...0> - argument strings
  4057                              <1> 	; Inputs: (arguments)
  4058                              <1> 	; Outputs: -	
  4059                              <1> 	; ...............................................................
  4060                              <1> 	;
  4061                              <1> 	; Retro UNIX 386 v1 modification: 
  4062                              <1> 	;	User application runs in it's own virtual space 
  4063                              <1> 	;	which is izolated from kernel memory (and other
  4064                              <1> 	;	memory pages) via 80386	paging in ring 3 
  4065                              <1> 	;	privilige mode. Virtual start address is always 0.
  4066                              <1> 	;	User's core memory starts at linear address 400000h
  4067                              <1> 	;	(the end of the 1st 4MB).
  4068                              <1> 	;
  4069                              <1> 	; Retro UNIX 8086 v1 modification: 
  4070                              <1> 	;	user/application segment and system/kernel segment
  4071                              <1> 	;	are different and sysenter/sysret/sysrele routines
  4072                              <1> 	;	are different (user's registers are saved to 
  4073                              <1> 	;	and then restored from system's stack.)
  4074                              <1> 	;
  4075                              <1> 	;	NOTE: Retro UNIX 8086 v1 'arg2' routine gets these
  4076                              <1> 	;	      arguments which were in these registers;
  4077                              <1> 	;	      but, it returns by putting the 1st argument
  4078                              <1> 	;	      in 'u.namep' and the 2nd argument
  4079                              <1> 	;	      on top of stack. (1st argument is offset of the
  4080                              <1> 	;	      file/path name in the user's program segment.)		 	
  4081                              <1> 	
  4082                              <1> 	;call	arg2
  4083                              <1> 	; * name - 'u.namep' points to address of file/path name
  4084                              <1> 	;          in the user's program segment ('u.segmnt')
  4085                              <1> 	;          with offset in BX register (as sysopen argument 1).
  4086                              <1> 	; * argp - sysexec argument 2 is in CX register 
  4087                              <1> 	;          which is on top of stack.
  4088                              <1> 	;
  4089                              <1> 		; jsr r0,arg2 / arg0 in u.namep,arg1 on top of stack
  4090                              <1> 
  4091                              <1> 	; 23/06/2015 (32 bit modifications)
  4092                              <1> 
  4093 0000D122 891D[FC490100]      <1> 	mov	[u.namep], ebx ; argument 1
  4094                              <1>         ; 18/10/2015
  4095 0000D128 890D[684A0100]      <1> 	mov     [argv], ecx  ; * ; argument 2
  4096 0000D12E E86F020000          <1> 	call	namei
  4097                              <1> 		; jsr r0,namei / namei returns i-number of file 
  4098                              <1> 			     ; / named in sysexec call in r1
  4099                              <1> 	;jc	error
  4100                              <1> 		; br error9
  4101 0000D133 731E                <1> 	jnc	short sysexec_0
  4102                              <1> 	;
  4103                              <1> 	; 'file not found !' error
  4104 0000D135 C705[484A0100]0C00- <1> 	mov	dword [u.error], ERR_FILE_NOT_FOUND
  4104 0000D13D 0000                <1>
  4105 0000D13F E956ECFFFF          <1> 	jmp	error 
  4106                              <1> sysexec_not_exf:
  4107                              <1> 	; 'not executable file !' error
  4108 0000D144 C705[484A0100]1600- <1> 	mov	dword [u.error], ERR_NOT_EXECUTABLE
  4108 0000D14C 0000                <1>
  4109 0000D14E E947ECFFFF          <1> 	jmp	error 
  4110                              <1> sysexec_0:
  4111 0000D153 E808180000          <1> 	call	iget
  4112                              <1> 		; jsr r0,iget / get i-node for file to be executed
  4113 0000D158 66F705[80460100]10- <1>         test    word [i.flgs], 10h
  4113 0000D160 00                  <1>
  4114                              <1> 		; bit $20,i.flgs / is file executable
  4115 0000D161 74E1                <1> 	jz	short sysexec_not_exf
  4116                              <1> 	;jz	error
  4117                              <1> 		; beq error9
  4118                              <1> 	;;
  4119 0000D163 E8FA170000          <1> 	call	iopen
  4120                              <1> 		; jsr r0,iopen / gets i-node for file with i-number
  4121                              <1> 			     ; / given in r1 (opens file)
  4122                              <1> 	; AX = i-number of the file
  4123 0000D168 66F705[80460100]20- <1> 	test	word [i.flgs], 20h
  4123 0000D170 00                  <1>
  4124                              <1> 		; bit $40,i.flgs / test user id on execution bit
  4125 0000D171 7415                <1> 	jz	short sysexec_1
  4126                              <1> 		; beq 1f
  4127 0000D173 803D[304A0100]00    <1> 	cmp 	byte [u.uid], 0 ; 02/08/2013
  4128                              <1> 		; tstb u.uid / test user id
  4129 0000D17A 760C                <1> 	jna	short sysexec_1
  4130                              <1> 		; beq 1f / super user
  4131 0000D17C 8A0D[83460100]      <1> 	mov	cl, [i.uid]
  4132 0000D182 880D[304A0100]      <1> 	mov	[u.uid], cl ; 02/08/2013
  4133                              <1> 		; movb i.uid,u.uid / put user id of owner of file
  4134                              <1> 				 ; / as process user id
  4135                              <1> sysexec_1:
  4136                              <1> 	; 18/10/2215
  4137                              <1> 	; 10/10/2015
  4138                              <1> 	; 24/07/2015
  4139                              <1> 	; 21/07/2015
  4140                              <1> 	; 25/06/2015
  4141                              <1> 	; 24/06/2015
  4142                              <1>         ; Moving arguments to the end of [u.upage]
  4143                              <1> 	; (by regarding page borders in user's memory space)
  4144                              <1> 	;
  4145                              <1> 	; 10/10/2015
  4146                              <1> 	; 21/07/2015
  4147 0000D188 89E5                <1> 	mov	ebp, esp ; (**)
  4148                              <1> 	; 18/10/2015
  4149 0000D18A 89EF                <1> 	mov 	edi, ebp
  4150 0000D18C B900010000          <1> 	mov 	ecx, MAX_ARG_LEN ; 256
  4151                              <1> 	;sub	edi, MAX_ARG_LEN ; 256
  4152 0000D191 29CF                <1> 	sub	edi, ecx
  4153 0000D193 89FC                <1> 	mov	esp, edi
  4154 0000D195 31C0                <1> 	xor	eax, eax
  4155 0000D197 A3[0C4A0100]        <1> 	mov 	[u.nread], eax ; 0
  4156 0000D19C 49                  <1> 	dec	ecx ; 256 - 1
  4157 0000D19D 890D[084A0100]      <1> 	mov 	[u.count], ecx ; MAX_ARG_LEN - 1 ; 255
  4158                              <1> 	;mov 	dword [u.count], MAX_ARG_LEN - 1 ; 255
  4159                              <1> sysexec_2:
  4160 0000D1A3 8B35[684A0100]      <1> 	mov	esi, [argv] ; 18/10/2015 
  4161 0000D1A9 E866000000          <1> 	call	get_argp
  4162 0000D1AE B904000000          <1> 	mov	ecx, 4 ; mov ecx, 4
  4163                              <1> sysexec_3:
  4164 0000D1B3 21C0                <1> 	and	eax, eax
  4165 0000D1B5 0F84E3070000        <1>         jz      sysexec_6
  4166                              <1> 	; 18/10/2015
  4167 0000D1BB 010D[684A0100]      <1> 	add	[argv], ecx ; 4
  4168 0000D1C1 66FF05[664A0100]    <1> 	inc	word [argc]
  4169                              <1> 	;
  4170 0000D1C8 A3[044A0100]        <1> 	mov	[u.base], eax
  4171                              <1>  	; 23/10/2015
  4172 0000D1CD 66C705[444A0100]00- <1> 	mov	word [u.pcount], 0
  4172 0000D1D5 00                  <1>
  4173                              <1> sysexec_4:
  4174 0000D1D6 E8650E0000          <1> 	call	cpass ; get a character from user's core memory
  4175 0000D1DB 750E                <1>         jnz      short sysexec_5
  4176                              <1> 		; (max. 255 chars + null)
  4177                              <1> 	; 18/10/2015
  4178 0000D1DD 28C0                <1> 	sub 	al, al
  4179 0000D1DF AA                  <1> 	stosb
  4180 0000D1E0 FF05[0C4A0100]      <1> 	inc	dword [u.nread]
  4181 0000D1E6 E9B3070000          <1> 	jmp	sysexec_6 ; 24/04/2016
  4182                              <1> sysexec_5:
  4183 0000D1EB AA                  <1> 	stosb
  4184 0000D1EC 20C0                <1> 	and 	al, al
  4185 0000D1EE 75E6                <1> 	jnz	short sysexec_4
  4186 0000D1F0 B904000000          <1> 	mov	ecx, 4
  4187 0000D1F5 390D[644A0100]      <1> 	cmp	[ncount], ecx ; 4
  4188 0000D1FB 72A6                <1> 	jb	short sysexec_2
  4189 0000D1FD 8B35[604A0100]      <1> 	mov	esi, [nbase]
  4190 0000D203 010D[604A0100]      <1> 	add	[nbase], ecx ; 4	
  4191 0000D209 66290D[644A0100]    <1> 	sub	[ncount], cx 
  4192 0000D210 8B06                <1> 	mov	eax, [esi]
  4193 0000D212 EB9F                <1> 	jmp	short sysexec_3
  4194                              <1> 
  4195                              <1> get_argp:
  4196                              <1> 	; 18/10/2015 (nbase, ncount)
  4197                              <1> 	; 21/07/2015
  4198                              <1> 	; 24/06/2015 (Retro UNIX 386 v1)
  4199                              <1> 	; Get (virtual) address of argument from user's core memory
  4200                              <1> 	;
  4201                              <1> 	; INPUT:
  4202                              <1> 	;	esi = virtual address of argument pointer
  4203                              <1> 	; OUTPUT:
  4204                              <1> 	;	eax = virtual address of argument
  4205                              <1> 	;
  4206                              <1> 	; Modified registers: EAX, EBX, ECX, EDX, ESI 
  4207                              <1> 	;
  4208 0000D214 833D[3C4A0100]00    <1>  	cmp     dword [u.ppgdir], 0 ; /etc/init ?
  4209                              <1> 				    ; (the caller is kernel)
  4210 0000D21B 7667                <1>         jna     short get_argpk 
  4211                              <1> 	;
  4212 0000D21D 89F3                <1>      	mov	ebx, esi
  4213 0000D21F E85F80FFFF          <1> 	call	get_physical_addr ; get physical address
  4214 0000D224 0F8289000000        <1>         jc      get_argp_err
  4215 0000D22A A3[604A0100]        <1> 	mov 	[nbase], eax ; physical address	
  4216 0000D22F 66890D[644A0100]    <1> 	mov	[ncount], cx ; remain byte count in page (1-4096)
  4217 0000D236 B804000000          <1> 	mov	eax, 4 ; 21/07/2015
  4218 0000D23B 6639C1              <1> 	cmp	cx, ax ; 4
  4219 0000D23E 735D                <1> 	jnb	short get_argp2
  4220 0000D240 89F3                <1> 	mov	ebx, esi
  4221 0000D242 01CB                <1> 	add	ebx, ecx
  4222 0000D244 E83A80FFFF          <1> 	call	get_physical_addr ; get physical address
  4223 0000D249 7268                <1> 	jc	short get_argp_err
  4224                              <1> 	;push	esi
  4225 0000D24B 89C6                <1> 	mov	esi, eax
  4226 0000D24D 66870D[644A0100]    <1> 	xchg	cx, [ncount]
  4227 0000D254 8735[604A0100]      <1> 	xchg	esi, [nbase]
  4228 0000D25A B504                <1> 	mov	ch, 4
  4229 0000D25C 28CD                <1> 	sub	ch, cl
  4230                              <1> get_argp0:
  4231 0000D25E AC                  <1> 	lodsb
  4232 0000D25F 6650                <1> 	push	ax
  4233 0000D261 FEC9                <1> 	dec	cl
  4234 0000D263 75F9                <1>         jnz     short get_argp0
  4235 0000D265 8B35[604A0100]      <1> 	mov	esi, [nbase]
  4236                              <1> 	; 21/07/2015
  4237 0000D26B 0FB6C5              <1> 	movzx	eax, ch
  4238 0000D26E 0105[604A0100]      <1> 	add	[nbase], eax
  4239 0000D274 662905[644A0100]    <1> 	sub	[ncount], ax
  4240                              <1> get_argp1:
  4241 0000D27B AC                  <1> 	lodsb
  4242 0000D27C FECD                <1> 	dec	ch
  4243 0000D27E 743D                <1>         jz      short get_argp3
  4244 0000D280 6650                <1>         push	ax
  4245 0000D282 EBF7                <1> 	jmp     short get_argp1
  4246                              <1> get_argpk:
  4247                              <1> 	; Argument is in kernel's memory space
  4248 0000D284 66C705[644A0100]00- <1> 	mov	word [ncount], PAGE_SIZE ; 4096
  4248 0000D28C 10                  <1>
  4249 0000D28D 8935[604A0100]      <1> 	mov	[nbase], esi
  4250 0000D293 8305[604A0100]04    <1> 	add	dword [nbase], 4
  4251 0000D29A 8B06                <1> 	mov	eax, [esi] ; virtual addr. = physcal addr.
  4252 0000D29C C3                  <1> 	retn
  4253                              <1> get_argp2:
  4254                              <1> 	; 21/07/2015
  4255                              <1> 	;mov	eax, 4
  4256 0000D29D 8B15[604A0100]      <1> 	mov 	edx, [nbase] ; 18/10/2015
  4257 0000D2A3 0105[604A0100]      <1> 	add	[nbase], eax
  4258 0000D2A9 662905[644A0100]    <1> 	sub	[ncount], ax
  4259                              <1> 	;
  4260 0000D2B0 8B02                <1> 	mov	eax, [edx]
  4261 0000D2B2 C3                  <1> 	retn
  4262                              <1> get_argp_err:
  4263 0000D2B3 A3[484A0100]        <1> 	mov	[u.error], eax
  4264 0000D2B8 E9DDEAFFFF          <1> 	jmp	error
  4265                              <1> get_argp3:
  4266 0000D2BD B103                <1> 	mov	cl, 3
  4267                              <1> get_argp4:
  4268 0000D2BF C1E008              <1> 	shl	eax, 8
  4269 0000D2C2 665A                <1> 	pop	dx
  4270 0000D2C4 88D0                <1> 	mov 	al, dl
  4271 0000D2C6 E2F7                <1>         loop    get_argp4
  4272                              <1> 	;pop	esi
  4273 0000D2C8 C3                  <1> 	retn	
  4274                              <1> 
  4275                              <1> sysstat: 
  4276                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4277                              <1> 	; temporary !
  4278 0000D2C9 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4279 0000D2CE A3[484A0100]        <1>         mov     [u.error], eax
  4280 0000D2D3 A3[E4490100]        <1>         mov     [u.r0], eax 
  4281 0000D2D8 E9BDEAFFFF          <1> 	jmp	error
  4282                              <1> 
  4283                              <1> sysfstat: 
  4284                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4285                              <1> 	; temporary !
  4286 0000D2DD B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4287 0000D2E2 A3[484A0100]        <1>         mov     [u.error], eax
  4288 0000D2E7 A3[E4490100]        <1>         mov     [u.r0], eax 
  4289 0000D2EC E9A9EAFFFF          <1> 	jmp	error
  4290                              <1> 
  4291                              <1> fclose:
  4292                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  4293                              <1> 	;
  4294                              <1> 	; 18/06/2015 (Retro UNIX 386 v1 - Beginning)
  4295                              <1> 	;            (32 bit offset pointer modification)
  4296                              <1> 	; 19/04/2013 - 12/01/2014 (Retro UNIX 8086 v1)
  4297                              <1> 	;
  4298                              <1> 	; Given the file descriptor (index to the u.fp list)
  4299                              <1> 	; 'fclose' first gets the i-number of the file via 'getf'.
  4300                              <1> 	; If i-node is active (i-number > 0) the entry in 
  4301                              <1> 	; u.fp list is cleared. If all the processes that opened
  4302                              <1> 	; that file close it, then fsp etry is freed and the file
  4303                              <1> 	; is closed. If not a return is taken. 
  4304                              <1> 	; If the file has been deleted while open, 'anyi' is called
  4305                              <1> 	; to see anyone else has it open, i.e., see if it is appears
  4306                              <1> 	; in another entry in the fsp table. Upon return from 'anyi'
  4307                              <1> 	; a check is made to see if the file is special.	
  4308                              <1> 	;
  4309                              <1> 	; INPUTS ->
  4310                              <1> 	;    r1 - contains the file descriptor (value=0,1,2...)
  4311                              <1> 	;    u.fp - list of entries in the fsp table
  4312                              <1> 	;    fsp - table of entries (4 words/entry) of open files.	 
  4313                              <1> 	; OUTPUTS ->
  4314                              <1> 	;    r1 - contains the same file descriptor
  4315                              <1> 	;    r2 - contains i-number
  4316                              <1> 	;
  4317                              <1> 	; ((AX = R1))
  4318                              <1> 	; ((Modified registers: eDX, eBX, eCX, eSI, eDI, eBP))
  4319                              <1> 	;
  4320                              <1> 	; Retro UNIX 8086 v1 modification : CF = 1
  4321                              <1> 	;              if i-number of the file is 0. (error)  	
  4322                              <1> 	;
  4323                              <1> 	; TRDOS 386 (06/10/2016)
  4324                              <1> 	; 
  4325                              <1> 	; INPUT:
  4326                              <1> 	;	EAX = File Handle (File Descriptor, File Index)
  4327                              <1> 	;
  4328                              <1> 	; OUTPUT:
  4329                              <1> 	;	CF = 1 -> File not open !
  4330                              <1> 	;	CF = 0 -> OK!
  4331                              <1> 	;	     EBX = File Number (System)
  4332                              <1> 	;	     [cdev] = Logical DOS Drive Number
  4333                              <1> 	;	     EAX = File Handle/Number (user) 	
  4334                              <1> 	;
  4335                              <1> 	; Modified Registers: EBX
  4336                              <1> 
  4337 0000D2F1 50                  <1> 	push	eax ; File handle
  4338                              <1> 	
  4339 0000D2F2 E846000000          <1> 	call	getf
  4340 0000D2F7 0F82FD1C0000        <1> 	jc	device_close ; eax = device number
  4341                              <1> 
  4342 0000D2FD 80BB[D2440100]01    <1> 	cmp	byte [ebx+OF_MODE], 1 ; open mode ; 0 = empty entry
  4343 0000D304 722E                <1> 	jb	short fclose_1	      ; 1 = read, 2 = write
  4344                              <1> 	
  4345 0000D306 83F801              <1> 	cmp	eax, 1 ; is the first cluster number > 0
  4346 0000D309 7229                <1> 	jb	short fclose_1 ; no, this is empty entry
  4347                              <1> 
  4348                              <1> fclose_0:
  4349 0000D30B FE8B[E6440100]      <1> 	dec	byte [ebx+OF_OPENCOUNT] ; decrement the number of processes 
  4350                              <1> 			                ; that have opened the file
  4351 0000D311 7921                <1> 	jns	short fclose_1 ; jump if not negative (jump if bit 7 is 0)	 
  4352                              <1> 			; if all processes haven't closed the file, return
  4353                              <1> 	;
  4354                              <1> 	; eax ; First cluster
  4355 0000D313 31C0                <1> 	xor	eax, eax ; 0
  4356 0000D315 8883[D2440100]      <1> 	mov	[ebx+OF_MODE], al ; 0 = empty entry
  4357                              <1> 	;mov	[ebx+OF_STATUS], al ; 0 = empty entry
  4358 0000D31B 66C1E302            <1> 	shl	bx, 2 
  4359 0000D31F 8983[A0440100]      <1> 	mov	[ebx+OF_FCLUSTER], eax ; 0
  4360 0000D325 8983[B8450100]      <1> 	mov	[ebx+OF_CCLUSTER], eax ; 0
  4361                              <1> 	;mov	[ebx+OF_CCINDEX], eax ; 0
  4362 0000D32B A3[F4490100]        <1> 	mov	[u.fofp], eax ; 0
  4363 0000D330 66C1EB02            <1> 	shr	bx, 2
  4364                              <1> fclose_1: ; 1:
  4365 0000D334 58                  <1> 	pop	eax ; File handle (File Descriptor, File Index)
  4366 0000D335 C680[EA490100]00    <1> 	mov	byte [eax+u.fp], 0 ; clear that entry in the u.fp list
  4367 0000D33C C3                  <1> 	retn
  4368                              <1> 
  4369                              <1> getf:
  4370                              <1> 	; 12/10/2016
  4371                              <1> 	; 11/10/2016
  4372                              <1> 	; 08/10/2016
  4373                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  4374                              <1> 	; / get the device number and the i-number of an open file
  4375                              <1> 	; 13/05/2015
  4376                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  4377                              <1> 	; 19/04/2013 - 18/11/2013 (Retro UNIX 8086 v1)
  4378                              <1> 	;
  4379 0000D33D 89C3                <1> 	mov	ebx, eax
  4380                              <1> getf1: 
  4381 0000D33F 83FB0A              <1> 	cmp	ebx, 10
  4382 0000D342 730A                <1>         jnb	short getf2
  4383 0000D344 8A9B[EA490100]      <1> 	mov	bl, [ebx+u.fp]
  4384 0000D34A 08DB                <1> 	or	bl, bl
  4385 0000D34C 7503                <1> 	jnz	short getf3
  4386                              <1> getf2:
  4387                              <1> 	; 'File not open !' error (ax=0)
  4388 0000D34E 29C0                <1> 	sub	eax, eax
  4389 0000D350 C3                  <1> 	retn
  4390                              <1> getf3:	
  4391 0000D351 F6C380              <1> 	test	bl, 80h
  4392 0000D354 7530                <1> 	jnz	short getf5 ; device
  4393 0000D356 FECB                <1> 	dec	bl ; 0 based
  4394 0000D358 8A83[C8440100]      <1> 	mov	al, [ebx+OF_DRIVE]
  4395 0000D35E A2[C6490100]        <1> 	mov	[cdev], al
  4396 0000D363 C0E302              <1> 	shl	bl, 2 ; *4 (dword offset)
  4397 0000D366 8B83[18450100]      <1> 	mov	eax, [ebx+OF_SIZE]
  4398 0000D36C A3[714A0100]        <1> 	mov	[i.size], eax ; file size
  4399 0000D371 8D83[F0440100]      <1> 	lea	eax, [ebx+OF_POINTER] ;12/10/2016
  4400 0000D377 A3[F4490100]        <1> 	mov	[u.fofp], eax
  4401 0000D37C 8B83[A0440100]      <1> 	mov	eax, [ebx+OF_FCLUSTER]
  4402 0000D382 C0EB02              <1> 	shr	bl, 2 ; /4 (byte offset) 
  4403                              <1> getf4:
  4404 0000D385 C3                  <1> 	retn
  4405                              <1> getf5: 
  4406                              <1> 	; get device number
  4407 0000D386 80E37F              <1> 	and	bl, 7Fh ; 1 to 7Fh
  4408 0000D389 FECB                <1> 	dec	bl ; 0 based (0 to 7Eh)
  4409 0000D38B 8A83[FA420100]      <1> 	mov	al, [ebx+DEV_DRIVER]
  4410 0000D391 8AAB[64420100]      <1> 	mov	ch, [ebx+DEV_ACCESS]
  4411 0000D397 8A8B[18430100]      <1> 	mov	cl, [ebx+DEV_OPENMODE]
  4412 0000D39D 80E5FE              <1> 	and	ch, 0FEh ; reset bit 0 ; dev_close
  4413 0000D3A0 F9                  <1> 	stc ; cf = 1 
  4414 0000D3A1 C3                  <1> 	retn	
  4415                              <1> 
  4416                              <1> namei:
  4417                              <1> 	; 04/12/2015 (14 byte file names)
  4418                              <1> 	; 18/10/2015 (nbase, ncount)
  4419                              <1> 	; 12/10/2015
  4420                              <1> 	; 21/08/2015
  4421                              <1> 	; 18/07/2015
  4422                              <1> 	; 02/07/2015
  4423                              <1> 	; 17/06/2015
  4424                              <1> 	; 16/06/2015 (Retro UNIX 386 v1 - Beginning)
  4425                              <1> 	; 24/04/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  4426                              <1> 	;
  4427                              <1> 	; 'namei' takes a file path name and returns i-number of
  4428                              <1> 	; the file in the current directory or the root directory
  4429                              <1> 	; (if the first character of the pathname is '/').	
  4430                              <1> 	;
  4431                              <1> 	; INPUTS ->
  4432                              <1> 	;    u.namep - points to a file path name
  4433                              <1> 	;    u.cdir - i-number of users directory
  4434                              <1> 	;    u.cdev - device number on which user directory resides	
  4435                              <1> 	; OUTPUTS ->
  4436                              <1> 	;    r1 - i-number of file
  4437                              <1> 	;    cdev
  4438                              <1> 	;    u.dirbuf - points to directory entry where a match 
  4439                              <1> 	;               occurs in the search for file path name.
  4440                              <1> 	;	        If no match u.dirb points to the end of 
  4441                              <1> 	;               the directory and r1 = i-number of the current
  4442                              <1> 	;	        directory.	
  4443                              <1> 	; ((AX = R1))
  4444                              <1> 	;
  4445                              <1> 	; (Retro UNIX Prototype : 07/10/2012 - 05/01/2013, UNIXCOPY.ASM)
  4446                              <1>         ; ((Modified registers: eDX, eBX, eCX, eSI, eDI, eBP))  
  4447                              <1> 	;
  4448                              <1> 
  4449 0000D3A2 66A1[E8490100]      <1> 	mov	ax, [u.cdir]
  4450                              <1> 		; mov u.cdir,r1 / put the i-number of current directory
  4451                              <1> 			      ; / in r1
  4452 0000D3A8 668B15[2E4A0100]    <1> 	mov	dx, [u.cdrv]
  4453 0000D3AF 668915[C6490100]    <1> 	mov	[cdev], dx 	    ; NOTE: Retro UNIX 8086 v1 
  4454                              <1> 				    ; device/drive number is in 1 byte, 
  4455                              <1> 				    ; not in 1 word!
  4456                              <1> 		; mov u.cdev,cdev / device number for users directory 
  4457                              <1> 				; / into cdev
  4458                              <1> 	; 12/10/2015
  4459                              <1> 	; 16/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
  4460                              <1>       	 ; convert virtual (pathname) addr to physical address
  4461 0000D3B6 E82C010000          <1> 	call    trans_addr_nmbp ; 12/10/2015
  4462                              <1> 		; esi = physical address of [u.namep]
  4463                              <1> 		; ecx = byte count in the page
  4464 0000D3BB 803E2F              <1> 	cmp	byte [esi], '/'
  4465                              <1> 		; cmpb *u.namep,$'/ / is first char in file name a /
  4466 0000D3BE 751E                <1> 	jne	short namei_1
  4467                              <1> 		; bne 1f
  4468 0000D3C0 FF05[FC490100]      <1> 	inc	dword [u.namep]
  4469                              <1> 		; inc u.namep / go to next char
  4470 0000D3C6 6649                <1> 	dec	cx ; remain byte count in the page
  4471 0000D3C8 7506                <1> 	jnz	short namei_0
  4472                              <1> 	; 12/10/2015
  4473 0000D3CA E818010000          <1> 	call	trans_addr_nmbp ; convert virtual address to physical
  4474                              <1> 		; esi = physical address (page start + offset)
  4475                              <1> 		; ecx = byte count in the page
  4476 0000D3CF 4E                  <1> 	dec	esi
  4477                              <1> namei_0:
  4478 0000D3D0 46                  <1> 	inc 	esi  ; go to next char
  4479 0000D3D1 66A1[D0490100]      <1> 	mov	ax, [rootdir] ; 09/07/2013
  4480                              <1> 		; mov rootdir,r1 / put i-number of rootdirectory in r1
  4481 0000D3D7 C605[C6490100]00    <1> 	mov	byte [cdev], 0
  4482                              <1> 		; clr cdev / clear device number
  4483                              <1> namei_1: ; 1:
  4484 0000D3DE F606FF              <1> 	test	byte [esi], 0FFh
  4485 0000D3E1 74A2                <1> 	jz	short getf4
  4486                              <1> 	;jz      nig
  4487                              <1> 		; tstb *u.namep / is the character in file name a nul
  4488                              <1> 		; beq nig / yes, end of file name reached; 
  4489                              <1> 			; / branch to "nig"
  4490                              <1> namei_2: ; 1:
  4491                              <1> 	; 18/10/2015
  4492 0000D3E3 8935[604A0100]      <1> 	mov 	[nbase], esi
  4493 0000D3E9 66890D[644A0100]    <1> 	mov 	[ncount], cx
  4494                              <1> 	;
  4495                              <1> 	;mov	dx, 2
  4496 0000D3F0 B202                <1> 	mov	dl, 2 ; user flag (read, non-owner)
  4497 0000D3F2 E86F150000          <1> 	call	access
  4498                              <1> 		; jsr r0,access; 2 / get i-node with i-number r1
  4499                              <1> 	; 'access' will not return here if user has not "r" permission !
  4500 0000D3F7 66F705[80460100]00- <1> 	test 	word [i.flgs], 4000h
  4500 0000D3FF 40                  <1>
  4501                              <1> 		; bit $40000,i.flgs / directory i-node?
  4502 0000D400 746A                <1>         jz      short namei_err
  4503                              <1> 		; beq error3 / no, got an error
  4504                              <1> 	; 16/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
  4505 0000D402 31C0                <1> 	xor	eax, eax
  4506 0000D404 A3[004A0100]        <1> 	mov	[u.off], eax ; 0
  4507 0000D409 66A1[714A0100]      <1> 	mov	ax, [i.size]
  4508 0000D40F A3[F8490100]        <1> 	mov	[u.dirp], eax
  4509                              <1> 		; mov i.size,u.dirp / put size of directory in u.dirp
  4510                              <1> 		; clr u.off / u.off is file offset used by user
  4511 0000D414 C705[F4490100]-     <1> 	mov	dword [u.fofp], u.off
  4511 0000D41A [004A0100]          <1>
  4512                              <1> 		; mov $u.off,u.fofp / u.fofp is a pointer to 
  4513                              <1> 				  ; / the offset portion of fsp entry
  4514                              <1> namei_3: ; 2:
  4515 0000D41E C705[044A0100]-     <1> 	mov	dword [u.base], u.dirbuf
  4515 0000D424 [184A0100]          <1>
  4516                              <1> 		; mov $u.dirbuf,u.base / u.dirbuf holds a file name 
  4517                              <1> 				    ; / copied from a directory
  4518 0000D428 C705[084A0100]1000- <1> 	mov 	dword [u.count], 16 ; 04/12/2015 (10 -> 16) 	
  4518 0000D430 0000                <1>
  4519                              <1>  		; mov $10.,u.count / u.count is byte count 
  4520                              <1> 				 ; / for reads and writes
  4521 0000D432 66A1[6D4A0100]      <1> 	mov 	ax, [ii]
  4522                              <1> 	; 31/07/2013 ('namei_r') - 16/06/2015 ('u.kcall')
  4523 0000D438 FE05[464A0100]      <1>  	inc     byte [u.kcall] ; the caller is 'namei' sign	
  4524 0000D43E E8A2070000          <1>     	call	readi
  4525                              <1> 		; jsr r0,readi / read 10. bytes of file 
  4526                              <1> 		      ; with i-number (r1); i.e. read a directory entry
  4527 0000D443 8B0D[0C4A0100]      <1> 	mov 	ecx, [u.nread]
  4528 0000D449 09C9                <1> 	or 	ecx, ecx
  4529                              <1> 		; tst u.nread
  4530 0000D44B 741B                <1> 	jz	short nib
  4531                              <1> 		; ble nib / gives error return
  4532                              <1> 	;
  4533 0000D44D 668B1D[184A0100]    <1> 	mov 	bx, [u.dirbuf]
  4534 0000D454 6621DB              <1> 	and 	bx, bx       
  4535                              <1> 		; tst u.dirbuf /
  4536 0000D457 7522                <1> 	jnz	short namei_4
  4537                              <1> 		; bne 3f / branch when active directory entry 
  4538                              <1> 		       ; / (i-node word in entry non zero)
  4539 0000D459 A1[004A0100]        <1> 	mov	eax, [u.off]
  4540 0000D45E 83E810              <1> 	sub	eax, 16 ; 04/12/2015 (10 -> 16) 
  4541 0000D461 A3[F8490100]        <1> 	mov	[u.dirp], eax
  4542                              <1> 		; mov u.off,u.dirp
  4543                              <1> 		; sub $10.,u.dirp
  4544 0000D466 EBB6                <1> 	jmp	short namei_3
  4545                              <1> 		; br 2b
  4546                              <1> 
  4547                              <1> 	; 18/07/2013
  4548                              <1> nib: 
  4549 0000D468 31C0                <1> 	xor	eax, eax  ; xor ax, ax ; ax = 0 -> file not found 
  4550 0000D46A F9                  <1> 	stc
  4551                              <1> nig:
  4552 0000D46B C3                  <1> 	retn
  4553                              <1> 
  4554                              <1> namei_err:
  4555                              <1> 	; 16/06/2015
  4556 0000D46C C705[484A0100]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a directory !' error
  4556 0000D474 0000                <1>
  4557 0000D476 E91FE9FFFF          <1> 	jmp	error
  4558                              <1> 
  4559                              <1> namei_4: ; 3:
  4560                              <1> 	; 18/10/2015
  4561                              <1> 	; 12/10/2015
  4562                              <1> 	; 21/08/2015
  4563                              <1> 	; 18/07/2015
  4564 0000D47B 8B2D[FC490100]      <1> 	mov	ebp, [u.namep]
  4565                              <1> 		; mov u.namep,r2 / u.namep points into a file name string
  4566 0000D481 BF[1A4A0100]        <1> 	mov 	edi, u.dirbuf + 2
  4567                              <1> 		; mov $u.dirbuf+2,r3 / points to file name of directory entry
  4568                              <1> 	; 18/10/2015
  4569 0000D486 8B35[604A0100]      <1> 	mov	esi, [nbase]	
  4570 0000D48C 668B0D[644A0100]    <1> 	mov	cx, [ncount]
  4571                              <1> 	;
  4572 0000D493 6621C9              <1> 	and	cx, cx
  4573 0000D496 7505                <1> 	jnz	short namei_5	
  4574                              <1> 	;
  4575 0000D498 E850000000          <1> 	call	trans_addr_nm ; convert virtual address to physical
  4576                              <1> 		; esi = physical address (page start + offset)
  4577                              <1> 		; ecx = byte count in the page
  4578                              <1> namei_5: ; 3:
  4579 0000D49D 45                  <1> 	inc	ebp ; 18/07/2015
  4580 0000D49E AC                  <1> 	lodsb   ; mov al, [esi] ; inc esi (al = r4)
  4581                              <1> 		; movb (r2)+,r4 / move a character from u.namep string into r4
  4582 0000D49F 08C0                <1> 	or 	al, al
  4583 0000D4A1 741D                <1> 	jz 	short namei_7
  4584                              <1> 		; beq 3f / if char is nul, then the last char in string
  4585                              <1> 			; / has been moved
  4586 0000D4A3 3C2F                <1> 	cmp	al, '/'
  4587                              <1> 		; cmp r4,$'/ / is char a </>
  4588 0000D4A5 7419                <1> 	je 	short namei_7
  4589                              <1> 		; beq 3f	
  4590                              <1> 	; 12/10/2015
  4591 0000D4A7 6649                <1> 	dec	cx ; remain byte count in the page
  4592 0000D4A9 7505                <1> 	jnz	short namei_6
  4593 0000D4AB E83D000000          <1> 	call	trans_addr_nm ; convert virtual address to physical
  4594                              <1> 		; esi = physical address (page start + offset)
  4595                              <1> 		; ecx = byte count in the page
  4596                              <1> namei_6:
  4597 0000D4B0 81FF[284A0100]      <1>         cmp     edi, u.dirbuf + 16 ; 04/12/2015 (10 -> 16) 
  4598                              <1> 		; cmp r3,$u.dirbuf+10. / have I checked
  4599                              <1> 				     ; / all 8 bytes of file name
  4600 0000D4B6 74E5                <1> 	je	short namei_5
  4601                              <1> 		; beq 3b
  4602 0000D4B8 AE                  <1> 	scasb	
  4603                              <1> 		; cmpb (r3)+,r4 / compare char in u.namep string to file name 
  4604                              <1> 			      ; / char read from directory
  4605 0000D4B9 74E2                <1> 	je 	short namei_5
  4606                              <1> 		; beq 3b / branch if chars match
  4607                              <1> 
  4608 0000D4BB E95EFFFFFF          <1>         jmp    namei_3 ; 2b
  4609                              <1> 		; br 2b / file names do not match go to next directory entry
  4610                              <1> namei_7: ; 3:
  4611 0000D4C0 81FF[284A0100]      <1> 	cmp	edi, u.dirbuf + 16 ; 04/12/2015 (10 -> 16) 
  4612                              <1> 		; cmp r3,$u.dirbuf+10. / if equal all 8 bytes were matched
  4613 0000D4C6 740A                <1> 	je	short namei_8
  4614                              <1> 		; beq 3f
  4615 0000D4C8 8A27                <1> 	mov 	ah, [edi]
  4616                              <1> 	;inc 	edi 
  4617 0000D4CA 20E4                <1> 	and 	ah, ah
  4618                              <1> 		; tstb (r3)+ /
  4619 0000D4CC 0F854CFFFFFF        <1>         jnz     namei_3
  4620                              <1> 		; bne 2b
  4621                              <1> namei_8: ; 3
  4622 0000D4D2 892D[FC490100]      <1> 	mov	[u.namep], ebp ; 18/07/2015
  4623                              <1> 		; mov r2,u.namep / u.namep points to char 
  4624                              <1> 			       ; / following a / or nul
  4625                              <1> 	;mov	bx, [u.dirbuf]
  4626                              <1> 		; mov u.dirbuf,r1 / move i-node number in directory 
  4627                              <1> 				; / entry to r1
  4628 0000D4D8 20C0                <1> 	and 	al, al
  4629                              <1> 		; tst r4 / if r4 = 0 the end of file name reached,
  4630                              <1> 		      ;  / if r4 = </> then go to next directory
  4631                              <1> 	; mov	ax, bx
  4632 0000D4DA 66A1[184A0100]      <1> 	mov 	ax, [u.dirbuf] ; 17/06/2015
  4633 0000D4E0 0F85FDFEFFFF        <1>         jnz     namei_2 
  4634                              <1> 		; bne 1b
  4635                              <1> 	; AX = i-number of the file
  4636                              <1> ;;nig:
  4637 0000D4E6 C3                  <1> 	retn
  4638                              <1> 		; tst (r0)+ / gives non-error return
  4639                              <1> ;;nib:
  4640                              <1> ;;	xor	ax, ax ; Retro UNIX 8086 v1 modification !
  4641                              <1> 		       ; ax = 0 -> file not found 
  4642                              <1> ;;	stc	; 27/05/2013
  4643                              <1> ;;	retn
  4644                              <1> 		; rts r0
  4645                              <1> 
  4646                              <1> trans_addr_nmbp:
  4647                              <1> 	; 18/10/2015
  4648                              <1> 	; 12/10/2015
  4649 0000D4E7 8B2D[FC490100]      <1> 	mov 	ebp, [u.namep]
  4650                              <1> trans_addr_nm: 
  4651                              <1> 	; Convert virtual (pathname) address to physical address
  4652                              <1> 	; (Retro UNIX 386 v1 feature only !)
  4653                              <1> 	; 18/10/2015
  4654                              <1> 	; 12/10/2015 (u.pnbase & u.pncount has been removed from code)
  4655                              <1> 	; 02/07/2015
  4656                              <1> 	; 17/06/2015
  4657                              <1> 	; 16/06/2015
  4658                              <1> 	;
  4659                              <1> 	; INPUTS: 
  4660                              <1> 	;	ebp = pathname address (virtual) ; [u.namep]
  4661                              <1> 	;	[u.pgdir] = user's page directory
  4662                              <1> 	; OUTPUT:
  4663                              <1> 	;       esi = physical address of the pathname
  4664                              <1> 	;	ecx = remain byte count in the page
  4665                              <1> 	;
  4666                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI)
  4667                              <1> 	;
  4668 0000D4ED 833D[3C4A0100]00    <1>         cmp     dword [u.ppgdir], 0  ; /etc/init ? (sysexec)
  4669 0000D4F4 7618                <1> 	jna	short trans_addr_nmk ; the caller is os kernel;
  4670                              <1> 				     ; it is already physical address
  4671 0000D4F6 50                  <1>    	push	eax	
  4672 0000D4F7 89EB                <1> 	mov	ebx, ebp ; [u.namep] ; pathname address (virtual)
  4673 0000D4F9 E8857DFFFF          <1>        	call	get_physical_addr ; get physical address
  4674 0000D4FE 7204                <1> 	jc	short tr_addr_nm_err
  4675                              <1> 	; 18/10/2015
  4676                              <1> 	; eax = physical address 
  4677                              <1> 	; cx = remain byte count in page (1-4096) 
  4678                              <1> 		; 12/10/2015 (cx = [u.pncount])
  4679 0000D500 89C6                <1> 	mov	esi, eax ; 12/10/2015 (esi=[u.pnbase])
  4680 0000D502 58                  <1> 	pop	eax 
  4681 0000D503 C3                  <1> 	retn
  4682                              <1> 
  4683                              <1> tr_addr_nm_err:
  4684 0000D504 A3[484A0100]        <1> 	mov	[u.error], eax
  4685                              <1> 	;pop 	eax
  4686 0000D509 E98CE8FFFF          <1> 	jmp	error
  4687                              <1> 
  4688                              <1> trans_addr_nmk:
  4689                              <1> 	; 12/10/2015
  4690                              <1> 	; 02/07/2015
  4691 0000D50E 8B35[FC490100]      <1> 	mov	esi, [u.namep]  ; [u.pnbase]
  4692 0000D514 66B90010            <1> 	mov	cx, PAGE_SIZE ; 4096 ; [u.pncount]
  4693 0000D518 C3                  <1> 	retn
  4694                              <1> 
  4695                              <1> syschdir:
  4696                              <1> 	; / makes the directory specified in the argument
  4697                              <1> 	; / the current directory
  4698                              <1> 	;
  4699                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  4700                              <1> 	; 19/06/2013 (Retro UNIX 8086 v1)
  4701                              <1> 	;
  4702                              <1> 	; 'syschdir' makes the directory specified in its argument
  4703                              <1> 	; the current working directory.
  4704                              <1> 	;
  4705                              <1> 	; Calling sequence:
  4706                              <1> 	;	syschdir; name
  4707                              <1> 	; Arguments:
  4708                              <1> 	;	name - address of the path name of a directory
  4709                              <1> 	;	       terminated by nul byte.	
  4710                              <1> 	; Inputs: -
  4711                              <1> 	; Outputs: -
  4712                              <1> 	; ...............................................................
  4713                              <1> 	;				
  4714                              <1> 	; Retro UNIX 8086 v1 modification:
  4715                              <1> 	;	 The user/application program puts address of 
  4716                              <1> 	;	 the path name in BX register as 'syschdir' 
  4717                              <1> 	; 	 system call argument.
  4718                              <1> 
  4719 0000D519 891D[FC490100]      <1> 	mov	[u.namep], ebx
  4720                              <1> 		;jsr r0,arg; u.namep / u.namep points to path name
  4721 0000D51F E87EFEFFFF          <1> 	call	namei
  4722                              <1> 		; jsr r0,namei / find its i-number
  4723                              <1> 	;jc	error
  4724                              <1> 		; br error3
  4725 0000D524 730F                <1> 	jnc	short syschdir0
  4726                              <1> 	; 'directory not found !' error
  4727 0000D526 C705[484A0100]0C00- <1> 	mov	dword [u.error], ERR_DIR_NOT_FOUND ; 12
  4727 0000D52E 0000                <1>
  4728 0000D530 E965E8FFFF          <1> 	jmp	error
  4729                              <1> syschdir0:
  4730 0000D535 E82C140000          <1> 	call	access
  4731                              <1> 		; jsr r0,access; 2 / get i-node into core
  4732 0000D53A 66F705[80460100]00- <1> 	test	word [i.flgs], 4000h
  4732 0000D542 40                  <1>
  4733                              <1> 		; bit $40000,i.flgs / is it a directory?
  4734                              <1> 	;jz	error 
  4735                              <1> 		; beq error3 / no error
  4736 0000D543 750F                <1> 	jnz	short syschdir1
  4737 0000D545 C705[484A0100]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a valid directory !'
  4737 0000D54D 0000                <1>
  4738 0000D54F E946E8FFFF          <1> 	jmp	error
  4739                              <1> syschdir1:
  4740 0000D554 66A3[E8490100]      <1> 	mov	[u.cdir], ax
  4741                              <1> 		; mov r1,u.cdir / move i-number to users 
  4742                              <1> 			      ; / current directory
  4743 0000D55A 66A1[C6490100]      <1> 	mov	ax, [cdev]
  4744 0000D560 66A3[2E4A0100]      <1> 	mov	[u.cdrv], ax
  4745                              <1> 		; mov cdev,u.cdev / move its device to users 
  4746                              <1> 			        ; / current device
  4747 0000D566 E94FE8FFFF          <1> 	jmp	sysret
  4748                              <1> 		; br sysret3
  4749                              <1> 	
  4750                              <1> syschmod: ; < change mode of file >
  4751                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4752                              <1> 	; temporary !
  4753 0000D56B B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4754 0000D570 A3[484A0100]        <1>         mov     [u.error], eax
  4755 0000D575 A3[E4490100]        <1>         mov     [u.r0], eax 
  4756 0000D57A E91BE8FFFF          <1> 	jmp	error
  4757                              <1> 
  4758                              <1> isown:
  4759                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4760                              <1> 	; 04/05/2013 - 07/07/2013 (Retro UNIX 8086 v1)
  4761                              <1> 	;
  4762                              <1> 	; 'isown' is given a file name (the 1st argument).
  4763                              <1> 	;  It find the i-number of that file via 'namei' 
  4764                              <1> 	;  then gets the i-node into core via 'iget'.
  4765                              <1> 	;  It then tests to see if the user is super user. 
  4766                              <1> 	;  If not, it cheks to see if the user is owner of 
  4767                              <1> 	;  the file. If he is not an error occurs.
  4768                              <1> 	;  If user is the owner 'setimod' is called to indicate
  4769                              <1> 	;  the inode has been modificed and the 2nd argument of
  4770                              <1> 	;  the call is put in r2.
  4771                              <1> 	;
  4772                              <1> 	; INPUTS ->
  4773                              <1> 	;    arguments of syschmod and syschown calls
  4774                              <1> 	; OUTPUTS ->
  4775                              <1> 	;    u.uid - id of user
  4776                              <1> 	;    imod - set to a 1
  4777                              <1> 	;    r2 - contains second argument of the system call				 	
  4778                              <1> 	;
  4779                              <1> 	;   ((AX=R2) output as 2nd argument)
  4780                              <1> 	;
  4781                              <1>         ; ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
  4782                              <1> 	;
  4783                              <1> 		; jsr r0,arg2 / u.namep points to file name
  4784                              <1> 	;; ! 2nd argument on top of stack !
  4785                              <1> 	;; 22/06/2015 - 32 bit modifications
  4786                              <1> 	;; 07/07/2013
  4787 0000D57F 891D[FC490100]      <1> 	mov	[u.namep], ebx ;; 1st argument
  4788 0000D585 51                  <1> 	push 	ecx ;; 2nd argument
  4789                              <1> 	;;
  4790 0000D586 E817FEFFFF          <1> 	call	namei
  4791                              <1> 		; jsr r0,namei / get its i-number
  4792                              <1>        ; Retro UNIX 8086 v1 modification !
  4793                              <1>        ; ax = 0 -> file not found 
  4794                              <1> 	;and	ax, ax
  4795                              <1> 	;jz	error
  4796                              <1> 	;jc	error ; 27/05/2013
  4797                              <1> 		; br error3
  4798 0000D58B 730F                <1> 	jnc	short isown0
  4799                              <1> 	; 'file not found !' error
  4800 0000D58D C705[484A0100]0C00- <1> 	mov	dword [u.error], ERR_FILE_NOT_FOUND ; 12
  4800 0000D595 0000                <1>
  4801 0000D597 E9FEE7FFFF          <1> 	jmp	error
  4802                              <1> isown0:
  4803 0000D59C E8BF130000          <1> 	call	iget
  4804                              <1> 		; jsr r0,iget / get i-node into core
  4805 0000D5A1 A0[304A0100]        <1> 	mov	al, [u.uid] ; 02/08/2013
  4806 0000D5A6 08C0                <1> 	or	al, al
  4807                              <1> 		; tstb u.uid / super user?
  4808 0000D5A8 7417                <1> 	jz	short isown1
  4809                              <1> 		; beq 1f / yes, branch
  4810 0000D5AA 3A05[83460100]      <1> 	cmp	al, [i.uid]
  4811                              <1> 		; cmpb i.uid,u.uid / no, is this the owner of
  4812                              <1> 				 ; / the file
  4813                              <1> 	;jne	error
  4814                              <1> 		; beq 1f / yes
  4815                              <1> 		; jmp error3 / no, error
  4816 0000D5B0 740F                <1> 	je	short isown1
  4817                              <1> 
  4818 0000D5B2 C705[484A0100]0B00- <1> 	mov	dword [u.error], ERR_NOT_OWNER  ; 11
  4818 0000D5BA 0000                <1>
  4819                              <1> 			;  'permission denied !' error
  4820 0000D5BC E9D9E7FFFF          <1> 	jmp	error
  4821                              <1> isown1: ; 1:
  4822 0000D5C1 E89E130000          <1> 	call	setimod
  4823                              <1> 		; jsr r0,setimod / indicates 
  4824                              <1> 		;	       ; / i-node has been modified
  4825 0000D5C6 58                  <1> 	pop	eax ; 2nd argument
  4826                              <1> 		; mov (sp)+,r2 / mode is put in r2 
  4827                              <1> 		       ; / (u.off put on stack with 2nd arg)
  4828 0000D5C7 C3                  <1> 	retn
  4829                              <1> 		; rts r0
  4830                              <1> 
  4831                              <1> ;;arg:  ; < get system call arguments >
  4832                              <1> 	; 'arg' extracts an argument for a routine whose call is 
  4833                              <1> 	; of form:
  4834                              <1> 	;	sys 'routine' ; arg1
  4835                              <1> 	;		or
  4836                              <1> 	;	sys 'routine' ; arg1 ; arg2
  4837                              <1> 	;		or
  4838                              <1> 	;	sys 'routine' ; arg1;...;arg10 (sys exec) 
  4839                              <1> 	;	
  4840                              <1> 	; INPUTS ->
  4841                              <1> 	;    u.sp+18 - contains a pointer to one of arg1..argn
  4842                              <1> 	;	This pointers's value is actually the value of
  4843                              <1> 	;	update pc at the the trap to sysent (unkni) is
  4844                              <1> 	;	made to process the sys instruction
  4845                              <1> 	;    r0 - contains the return address for the routine
  4846                              <1> 	;	that called arg. The data in the word pointer 
  4847                              <1> 	;	to by the return address is used as address
  4848                              <1> 	;	in which the extracted argument is stored   		
  4849                              <1> 	;    	
  4850                              <1> 	; OUTPUTS ->
  4851                              <1> 	;    'address' - contains the extracted argument 
  4852                              <1> 	;    u.sp+18 - is incremented by 2 
  4853                              <1> 	;    r1 - contains the extracted argument
  4854                              <1> 	;    r0 - points to the next instruction to be
  4855                              <1> 	;	 executed in the calling routine.
  4856                              <1> 	;
  4857                              <1>   
  4858                              <1> 	; mov u.sp,r1
  4859                              <1> 	; mov *18.(r1),*(r0)+ / put argument of system call
  4860                              <1> 			; / into argument of arg2
  4861                              <1> 	; add $2,18.(r1) / point pc on stack 
  4862                              <1> 			      ; / to next system argument
  4863                              <1> 	; rts r0
  4864                              <1> 
  4865                              <1> ;;arg2: ; < get system calls arguments - with file name pointer>
  4866                              <1> 	; 'arg2' takes first argument in system call
  4867                              <1> 	;  (pointer to name of the file) and puts it in location
  4868                              <1> 	;  u.namep; takes second argument and puts it in u.off
  4869                              <1> 	;  and on top of the stack
  4870                              <1> 	;	
  4871                              <1> 	; INPUTS ->
  4872                              <1> 	;    u.sp, r0
  4873                              <1> 	;    	
  4874                              <1> 	; OUTPUTS ->
  4875                              <1> 	;    u.namep
  4876                              <1> 	;    u.off 
  4877                              <1> 	;    u.off pushed on stack
  4878                              <1> 	;    r1
  4879                              <1> 	;
  4880                              <1> 
  4881                              <1> 	; jsr	r0,arg; u.namep / u.namep contains value of
  4882                              <1> 				; / first arg in sys call
  4883                              <1> 	; jsr r0,arg; u.off / u.off contains value of 
  4884                              <1> 				; / second arg in sys call
  4885                              <1> 	; mov r0,r1 / r0 points to calling routine
  4886                              <1> 	; mov (sp),r0 / put operation code back in r0
  4887                              <1> 	; mov u.off,(sp) / put pointer to second argument 
  4888                              <1> 			; / on stack
  4889                              <1> 	; jmp (r1) / return to calling routine
  4890                              <1> 
  4891                              <1> syschown: ; < change owner of file >
  4892                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  4893                              <1> 	; 20/06/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  4894                              <1> 	;
  4895                              <1> 	; 'syschown' changes the owner of the file whose name is given
  4896                              <1> 	; as null terminated string pointed to by 'name' has it's owner
  4897                              <1> 	; changed to 'owner'
  4898                              <1> 	;
  4899                              <1> 	; Calling sequence:
  4900                              <1> 	;	syschown; name; owner
  4901                              <1> 	; Arguments:
  4902                              <1> 	;	name - address of the file name
  4903                              <1> 	;	       terminated by null byte.
  4904                              <1> 	;	owner - (new) owner (number/ID)
  4905                              <1> 	;	
  4906                              <1> 	; Inputs: -
  4907                              <1> 	; Outputs: -
  4908                              <1> 	; ...............................................................
  4909                              <1> 	;				
  4910                              <1> 	; Retro UNIX 8086 v1 modification: 
  4911                              <1> 	;       'syschown' system call has two arguments; so,
  4912                              <1> 	;	* 1st argument, name is pointed to by BX register
  4913                              <1> 	;	* 2nd argument, owner number is in CX register
  4914                              <1> 	;
  4915                              <1> 	; / name; owner
  4916 0000D5C8 E8B2FFFFFF          <1> 	call	isown
  4917                              <1> 		; jsr r0,isown / get the i-node and check user status
  4918 0000D5CD 803D[304A0100]00    <1> 	cmp 	byte [u.uid], 0 ; 02/08/2013 
  4919                              <1> 		; tstb u.uid / super user
  4920 0000D5D4 7418                <1> 	jz	short syschown1
  4921                              <1> 		; beq 2f / yes, 2f
  4922 0000D5D6 F605[80460100]20    <1>         test    byte [i.flgs], 20h ; 32
  4923                              <1> 		; bit $40,i.flgs / no, set userid on execution?
  4924                              <1> 	;jnz	error
  4925                              <1> 		; bne 3f / yes error, could create Trojan Horses
  4926 0000D5DD 740F                <1> 	jz	short syschown1
  4927                              <1> 	; 'permission denied !'
  4928 0000D5DF C705[484A0100]0B00- <1> 	mov	dword [u.error], ERR_FILE_ACCESS  ; 11
  4928 0000D5E7 0000                <1>
  4929 0000D5E9 E9ACE7FFFF          <1> 	jmp	error
  4930                              <1> syschown1: ; 2:
  4931                              <1> 	; AL = owner (number/ID)
  4932 0000D5EE A2[83460100]        <1> 	mov	[i.uid], al ; 23/06/2015
  4933                              <1> 		;  movb	r2,i.uid / no, put the new owners id 
  4934                              <1> 			       ; / in the i-node
  4935 0000D5F3 E9C2E7FFFF          <1> 	jmp	sysret
  4936                              <1> 	; 1: 
  4937                              <1> 		; jmp sysret4
  4938                              <1> 	; 3:
  4939                              <1> 		; jmp	error
  4940                              <1> 
  4941                              <1> systime: ; / get time of year
  4942                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  4943                              <1> 	; 20/06/2013 (Retro UNIX 8086 v1)
  4944                              <1> 	;
  4945                              <1> 	; 20/06/2013
  4946                              <1> 	; 'systime' gets the time of the year.
  4947                              <1> 	; The present time is put on the stack.
  4948                              <1> 	;
  4949                              <1> 	; Calling sequence:
  4950                              <1> 	;	systime
  4951                              <1> 	; Arguments: -
  4952                              <1> 	;	
  4953                              <1> 	; Inputs: -
  4954                              <1> 	; Outputs: sp+2, sp+4 - present time
  4955                              <1> 	; ...............................................................
  4956                              <1> 	;	
  4957                              <1> 	; Retro UNIX 8086 v1 modification: 
  4958                              <1> 	;       'systime' system call will return to the user
  4959                              <1> 	;	with unix time (epoch) in DX:AX register pair
  4960                              <1> 	;
  4961                              <1> 	; 	!! Major modification on original Unix v1 'systime' 
  4962                              <1> 	;	system call for PC compatibility !!		 	
  4963                              <1> 
  4964 0000D5F8 E86A130000          <1> 	call 	epoch
  4965 0000D5FD A3[E4490100]        <1> 	mov 	[u.r0], eax
  4966                              <1> 		; mov s.time,4(sp)
  4967                              <1> 		; mov s.time+2,2(sp) / put the present time 
  4968                              <1> 				   ; / on the stack
  4969                              <1> 		; br sysret4
  4970 0000D602 E9B3E7FFFF          <1> 	jmp	sysret 
  4971                              <1> 
  4972                              <1> sysstime: ; / set time
  4973                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  4974                              <1> 	; 20/06/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  4975                              <1> 	;
  4976                              <1> 	; 'sysstime' sets the time. Only super user can use this call.
  4977                              <1> 	;
  4978                              <1> 	; Calling sequence:
  4979                              <1> 	;	sysstime
  4980                              <1> 	; Arguments: -
  4981                              <1> 	;	
  4982                              <1> 	; Inputs: sp+2, sp+4 - time system is to be set to.
  4983                              <1> 	; Outputs: -
  4984                              <1> 	; ...............................................................
  4985                              <1> 	;	
  4986                              <1> 	; Retro UNIX 8086 v1 modification: 
  4987                              <1> 	;	the user calls 'sysstime' with unix (epoch) time
  4988                              <1> 	;	(to be set) is in CX:BX register pair as two arguments.
  4989                              <1> 	; 
  4990                              <1> 	;	Retro UNIX 8086 v1 argument transfer method 2 is used
  4991                              <1> 	;	to get sysstime system call arguments from the user;
  4992                              <1> 	;	* 1st argument, lowword of unix time is in BX register
  4993                              <1> 	;	* 2nd argument, highword of unix time is in CX register		 	
  4994                              <1> 	;
  4995                              <1> 	; 	!! Major modification on original Unix v1 'sysstime' 
  4996                              <1> 	;	system call for PC compatibility !!	
  4997                              <1> 
  4998 0000D607 803D[304A0100]00    <1> 	cmp	byte [u.uid], 0
  4999                              <1> 		; tstb u.uid / is user the super user
  5000                              <1> 	;ja	error
  5001                              <1> 		; bne error4 / no, error
  5002 0000D60E 760F                <1> 	jna	short systime1
  5003                              <1> 	; 'permission denied !'
  5004 0000D610 C705[484A0100]0B00- <1> 	mov	dword [u.error], ERR_NOT_SUPERUSER  ; 11 
  5004 0000D618 0000                <1>
  5005 0000D61A E97BE7FFFF          <1> 	jmp	error
  5006                              <1> systime1:
  5007                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - 32 bit version)
  5008                              <1> 	; EBX = unix (epoch) time (from user)
  5009 0000D61F 89D8                <1> 	mov	eax, ebx
  5010 0000D621 E843130000          <1> 	call 	set_date_time
  5011                              <1> 		; mov 4(sp),s.time
  5012                              <1> 		; mov 2(sp),s.time+2 / set the system time
  5013 0000D626 E98FE7FFFF          <1> 	jmp	sysret
  5014                              <1> 		; br sysret4
  5015                              <1> 
  5016                              <1> sysbreak:
  5017                              <1> 	; 18/10/2015
  5018                              <1> 	; 07/10/2015
  5019                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  5020                              <1> 	; 20/06/2013 - 24/03/2014 (Retro UNIX 8086 v1)
  5021                              <1> 	;
  5022                              <1> 	; 'sysbreak' sets the programs break points. 
  5023                              <1> 	; It checks the current break point (u.break) to see if it is
  5024                              <1> 	; between "core" and the stack (sp). If it is, it is made an
  5025                              <1> 	; even address (if it was odd) and the area between u.break
  5026                              <1> 	; and the stack is cleared. The new breakpoint is then put
  5027                              <1> 	; in u.break and control is passed to 'sysret'.
  5028                              <1> 	;
  5029                              <1> 	; Calling sequence:
  5030                              <1> 	;	sysbreak; addr
  5031                              <1> 	; Arguments: -
  5032                              <1> 	;	
  5033                              <1> 	; Inputs: u.break - current breakpoint
  5034                              <1> 	; Outputs: u.break - new breakpoint 
  5035                              <1> 	;	area between old u.break and the stack (sp) is cleared.
  5036                              <1> 	; ...............................................................
  5037                              <1> 	;	
  5038                              <1> 	; Retro UNIX 8086 v1 modification:
  5039                              <1> 	;	The user/application program puts breakpoint address
  5040                              <1> 	;       in BX register as 'sysbreak' system call argument.
  5041                              <1> 	; 	(argument transfer method 1)
  5042                              <1> 	;
  5043                              <1> 	;  NOTE: Beginning of core is 0 in Retro UNIX 8086 v1 !
  5044                              <1> 	; 	((!'sysbreak' is not needed in Retro UNIX 8086 v1!))
  5045                              <1> 	;  NOTE:
  5046                              <1> 	; 	'sysbreak' clears extended part (beyond of previous
  5047                              <1> 	;	'u.break' address) of user's memory for original unix's
  5048                              <1> 	;	'bss' compatibility with Retro UNIX 8086 v1 (19/11/2013)
  5049                              <1> 
  5050                              <1> 		; mov u.break,r1 / move users break point to r1
  5051                              <1> 		; cmp r1,$core / is it the same or lower than core?
  5052                              <1> 		; blos 1f / yes, 1f
  5053                              <1> 	; 23/06/2015
  5054 0000D62B 8B2D[104A0100]      <1> 	mov	ebp, [u.break] ; virtual address (offset)
  5055                              <1> 	;and	ebp, ebp
  5056                              <1> 	;jz	short sysbreak_3 
  5057                              <1> 	; Retro UNIX 386 v1 NOTE: u.break points to virtual address !!!
  5058                              <1> 	; (Even break point address is not needed for Retro UNIX 386 v1)
  5059 0000D631 8B15[DC490100]      <1> 	mov	edx, [u.sp] ; kernel stack at the beginning of sys call
  5060 0000D637 83C20C              <1> 	add	edx, 12 ; EIP -4-> CS -4-> EFLAGS -4-> ESP (user) 
  5061                              <1> 	; 07/10/2015
  5062 0000D63A 891D[104A0100]      <1> 	mov	[u.break], ebx ; virtual address !!!
  5063                              <1> 	;
  5064 0000D640 3B1A                <1> 	cmp	ebx, [edx] ; compare new break point with 
  5065                              <1> 			   ; with top of user's stack (virtual!)
  5066 0000D642 7327                <1> 	jnb	short sysbreak_3
  5067                              <1> 		; cmp r1,sp / is it the same or higher 
  5068                              <1> 			  ; / than the stack?
  5069                              <1> 		; bhis 1f / yes, 1f
  5070 0000D644 89DE                <1> 	mov	esi, ebx
  5071 0000D646 29EE                <1> 	sub	esi, ebp ; new break point - old break point
  5072 0000D648 7621                <1> 	jna	short sysbreak_3 
  5073                              <1> 	;push	ebx
  5074                              <1> sysbreak_1:
  5075 0000D64A 89EB                <1> 	mov	ebx, ebp  
  5076 0000D64C E8327CFFFF          <1> 	call	get_physical_addr ; get physical address
  5077 0000D651 0F82ADFEFFFF        <1> 	jc	tr_addr_nm_err
  5078                              <1> 	; 18/10/2015
  5079 0000D657 89C7                <1> 	mov	edi, eax 
  5080 0000D659 29C0                <1> 	sub	eax, eax ; 0
  5081                              <1> 		 ; ECX = remain byte count in page (1-4096)
  5082 0000D65B 39CE                <1> 	cmp	esi, ecx
  5083 0000D65D 7302                <1> 	jnb	short sysbreak_2
  5084 0000D65F 89F1                <1> 	mov	ecx, esi
  5085                              <1> sysbreak_2:
  5086 0000D661 29CE                <1> 	sub	esi, ecx
  5087 0000D663 01CD                <1> 	add	ebp, ecx
  5088 0000D665 F3AA                <1> 	rep 	stosb
  5089 0000D667 09F6                <1> 	or	esi, esi
  5090 0000D669 75DF                <1> 	jnz	short sysbreak_1
  5091                              <1> 	;
  5092                              <1> 		; bit $1,r1 / is it an odd address
  5093                              <1> 		; beq 2f / no, its even
  5094                              <1> 		; clrb (r1)+ / yes, make it even
  5095                              <1> 	; 2: / clear area between the break point and the stack
  5096                              <1> 		; cmp r1,sp / is it higher or same than the stack
  5097                              <1> 		; bhis 1f / yes, quit
  5098                              <1> 		; clr (r1)+ / clear word
  5099                              <1> 		; br 2b / go back
  5100                              <1> 	;pop	ebx
  5101                              <1> sysbreak_3: ; 1:
  5102                              <1> 	;mov	[u.break], ebx ; virtual address !!!
  5103                              <1> 		; jsr r0,arg; u.break / put the "address" 
  5104                              <1> 			; / in u.break (set new break point)
  5105                              <1> 		; br sysret4 / br sysret
  5106 0000D66B E94AE7FFFF          <1> 	jmp	sysret
  5107                              <1> 
  5108                              <1> sysseek: ; / moves read write pointer in an fsp entry
  5109                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
  5110                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5111                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  5112                              <1> 	;
  5113                              <1> 	; 'sysseek' changes the r/w pointer of (3rd word of in an
  5114                              <1> 	; fsp entry) of an open file whose file descriptor is in u.r0.
  5115                              <1> 	; The file descriptor refers to a file open for reading or
  5116                              <1> 	; writing. The read (or write) pointer is set as follows:
  5117                              <1> 	;	* if 'ptrname' is 0, the pointer is set to offset.
  5118                              <1> 	;	* if 'ptrname' is 1, the pointer is set to its
  5119                              <1> 	;	  current location plus offset.
  5120                              <1> 	;	* if 'ptrname' is 2, the pointer is set to the
  5121                              <1> 	;	  size of file plus offset.
  5122                              <1> 	; The error bit (e-bit) is set for an undefined descriptor.
  5123                              <1> 	;
  5124                              <1> 	; Calling sequence:
  5125                              <1> 	;	sysseek; offset; ptrname
  5126                              <1> 	; Arguments:
  5127                              <1> 	;	offset - number of bytes desired to move 
  5128                              <1> 	;		 the r/w pointer
  5129                              <1> 	;	ptrname - a switch indicated above
  5130                              <1> 	;
  5131                              <1> 	; Inputs: r0 - file descriptor 
  5132                              <1> 	; Outputs: -
  5133                              <1> 	; ...............................................................
  5134                              <1> 	;	
  5135                              <1> 	; Retro UNIX 8086 v1 modification: 
  5136                              <1> 	;       'sysseek' system call has three arguments; so,
  5137                              <1> 	;	* 1st argument, file descriptor is in BX (BL) register
  5138                              <1> 	;	* 2nd argument, offset is in CX register
  5139                              <1> 	;	* 3rd argument, ptrname/switch is in DX (DL) register	
  5140                              <1> 
  5141 0000D670 E821000000          <1> 	call	seektell
  5142                              <1> 	; EAX = Current R/W pointer of the file
  5143                              <1> 	; EBX = [u.fofp]
  5144                              <1> 	; [u.base] = offset (ECX input)
  5145                              <1> 
  5146 0000D675 0305[044A0100]      <1> 	add	eax, [u.base]
  5147 0000D67B 8903                <1> 	mov	[ebx], eax
  5148 0000D67D E938E7FFFF          <1> 	jmp	sysret
  5149                              <1> 
  5150                              <1> systell: ; / get the r/w pointer
  5151                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0) - temporary !-
  5152                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5153                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  5154                              <1> 	;
  5155                              <1> 	; Retro UNIX 8086 v1 modification:
  5156                              <1> 	; ! 'systell' does not work in original UNIX v1,
  5157                              <1> 	; 	    it returns with error !
  5158                              <1> 	; Inputs: r0 - file descriptor 
  5159                              <1> 	; Outputs: r0 - file r/w pointer
  5160                              <1> 
  5161                              <1> 	;xor	ecx, ecx ; 0
  5162 0000D682 BA01000000          <1> 	mov	edx, 1 ; 05/08/2013
  5163                              <1> 	;call 	seektell
  5164 0000D687 E810000000          <1> 	call 	seektell0 ; 05/08/2013
  5165                              <1> 	;; 06/11/2016
  5166                              <1> 	;; mov	eax, [ebx]
  5167 0000D68C A3[E4490100]        <1> 	mov	[u.r0], eax
  5168 0000D691 E924E7FFFF          <1> 	jmp	sysret
  5169                              <1> 
  5170                              <1> ; Original unix v1 'systell' system call:
  5171                              <1> 		; jsr r0,seektell
  5172                              <1> 		; br error4
  5173                              <1> 
  5174                              <1> seektell:
  5175                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
  5176                              <1> 	; 03/01/2016
  5177                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5178                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  5179                              <1> 	;
  5180                              <1> 	; 'seektell' puts the arguments from sysseek and systell
  5181                              <1> 	; call in u.base and u.count. It then gets the i-number of
  5182                              <1> 	; the file from the file descriptor in u.r0 and by calling
  5183                              <1> 	; getf. The i-node is brought into core and then u.count
  5184                              <1> 	; is checked to see it is a 0, 1, or 2.
  5185                              <1> 	; If it is 0 - u.count stays the same
  5186                              <1> 	;          1 - u.count = offset (u.fofp)
  5187                              <1> 	;	   2 - u.count = i.size (size of file)
  5188                              <1> 	; 	 		
  5189                              <1> 	; !! Retro UNIX 8086 v1 modification:
  5190                              <1> 	;	Argument 1, file descriptor is in BX;
  5191                              <1> 	;	Argument 2, offset is in CX;
  5192                              <1> 	;	Argument 3, ptrname/switch is in DX register.	
  5193                              <1> 	;
  5194                              <1> 	; ((Return -> eax = base for offset (position= base+offset))
  5195                              <1> 	;
  5196 0000D696 890D[044A0100]      <1> 	mov 	[u.base], ecx ; offset
  5197                              <1> seektell0:
  5198 0000D69C 8915[084A0100]      <1> 	mov 	[u.count], edx
  5199                              <1> 	; EBX = file descriptor (file number)
  5200 0000D6A2 E898FCFFFF          <1> 	call	getf1
  5201                              <1> 	; EAX = First cluster of the file
  5202                              <1> 	; EBX = File number (Open file number)
  5203                              <1> 	; [u.fofp] = Pointer to File pointer
  5204                              <1> 	; [i.size] = File size
  5205                              <1> 
  5206 0000D6A7 09C0                <1> 	or	eax, eax
  5207 0000D6A9 7514                <1> 	jnz	short seektell1
  5208                              <1> 
  5209 0000D6AB B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN
  5210 0000D6B0 A3[E4490100]        <1> 	mov	[u.r0], eax 
  5211 0000D6B5 A3[484A0100]        <1> 	mov	dword [u.error], eax ; 'file not open !'
  5212 0000D6BA E9DBE6FFFF          <1> 	jmp	error
  5213                              <1> 
  5214                              <1> seektell1:
  5215 0000D6BF 8B1D[F4490100]      <1>         mov     ebx, [u.fofp]
  5216 0000D6C5 803D[084A0100]01    <1> 	cmp	byte [u.count], 1
  5217 0000D6CC 7705                <1> 	ja	short seektell2
  5218 0000D6CE 7409                <1> 	je	short seektell3
  5219 0000D6D0 31C0                <1> 	xor	eax, eax
  5220 0000D6D2 C3                  <1> 	retn
  5221                              <1> 
  5222                              <1> seektell2:
  5223 0000D6D3 A1[714A0100]        <1>         mov   	eax, [i.size]
  5224 0000D6D8 C3                  <1> 	retn
  5225                              <1> 
  5226                              <1> seektell3:
  5227 0000D6D9 8B03                <1> 	mov	eax, [ebx]
  5228 0000D6DB C3                  <1> 	retn
  5229                              <1> 
  5230                              <1> sysintr: ; / set interrupt handling
  5231                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5232                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  5233                              <1> 	;
  5234                              <1> 	; 'sysintr' sets the interrupt handling value. It puts
  5235                              <1> 	; argument of its call in u.intr then branches into 'sysquit'
  5236                              <1> 	; routine. u.tty is checked if to see if a control tty exists.
  5237                              <1> 	; If one does the interrupt character in the tty buffer is
  5238                              <1> 	; cleared and 'sysret'is called. If one does not exits
  5239                              <1> 	; 'sysret' is just called.	
  5240                              <1> 	;
  5241                              <1> 	; Calling sequence:
  5242                              <1> 	;	sysintr; arg
  5243                              <1> 	; Argument:
  5244                              <1> 	;	arg - if 0, interrupts (ASCII DELETE) are ignored.
  5245                              <1> 	;	    - if 1, intterupts cause their normal result
  5246                              <1> 	;		 i.e force an exit.
  5247                              <1> 	;	    - if arg is a location within the program,
  5248                              <1> 	;		control is passed to that location when
  5249                              <1> 	;		an interrupt occurs.	
  5250                              <1> 	; Inputs: -
  5251                              <1> 	; Outputs: -
  5252                              <1> 	; ...............................................................
  5253                              <1> 	;	
  5254                              <1> 	; Retro UNIX 8086 v1 modification: 
  5255                              <1> 	;       'sysintr' system call sets u.intr to value of BX
  5256                              <1> 	;	then branches into sysquit.
  5257                              <1> 	;
  5258 0000D6DC 66891D[2A4A0100]    <1> 	mov	[u.intr], bx
  5259                              <1> 		; jsr r0,arg; u.intr / put the argument in u.intr
  5260                              <1> 		; br 1f / go into quit routine
  5261 0000D6E3 E9D2E6FFFF          <1> 	jmp	sysret
  5262                              <1> 
  5263                              <1> sysquit:
  5264                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5265                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  5266                              <1> 	;
  5267                              <1> 	; 'sysquit' turns off the quit signal. it puts the argument of
  5268                              <1> 	; the call in u.quit. u.tty is checked if to see if a control 
  5269                              <1> 	; tty exists. If one does the interrupt character in the tty
  5270                              <1> 	; buffer is cleared and 'sysret'is called. If one does not exits
  5271                              <1> 	; 'sysret' is just called.	
  5272                              <1> 	;
  5273                              <1> 	; Calling sequence:
  5274                              <1> 	;	sysquit; arg
  5275                              <1> 	; Argument:
  5276                              <1> 	;	arg - if 0, this call diables quit signals from the
  5277                              <1> 	;		typewriter (ASCII FS)
  5278                              <1> 	;	    - if 1, quits are re-enabled and cause execution to
  5279                              <1> 	;		cease and a core image to be produced.
  5280                              <1> 	;		 i.e force an exit.
  5281                              <1> 	;	    - if arg is an addres in the program,
  5282                              <1> 	;		a quit causes control to sent to that
  5283                              <1> 	;		location.	
  5284                              <1> 	; Inputs: -
  5285                              <1> 	; Outputs: -
  5286                              <1> 	; ...............................................................
  5287                              <1> 	;	
  5288                              <1> 	; Retro UNIX 8086 v1 modification: 
  5289                              <1> 	;       'sysquit' system call sets u.quit to value of BX
  5290                              <1> 	;	then branches into 'sysret'.
  5291                              <1> 	;
  5292 0000D6E8 66891D[2C4A0100]    <1> 	mov	[u.quit], bx
  5293 0000D6EF E9C6E6FFFF          <1> 	jmp	sysret
  5294                              <1> 		; jsr r0,arg; u.quit / put argument in u.quit
  5295                              <1> 	;1:
  5296                              <1> 		; mov u.ttyp,r1 / move pointer to control tty buffer
  5297                              <1> 			      ; / to r1
  5298                              <1> 		; beq sysret4 / return to user
  5299                              <1> 		; clrb 6(r1) / clear the interrupt character 
  5300                              <1> 			   ; / in the tty buffer
  5301                              <1> 		; br sysret4 / return to user
  5302                              <1> 
  5303                              <1> syssetuid: ; / set process id
  5304                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5305                              <1> 	; 07/07/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  5306                              <1> 	;
  5307                              <1> 	; 'syssetuid' sets the user id (u.uid) of the current process
  5308                              <1> 	; to the process id in (u.r0). Both the effective user and 
  5309                              <1> 	; u.uid and the real user u.ruid are set to this. 
  5310                              <1> 	; Only the super user can make this call.	
  5311                              <1> 	;
  5312                              <1> 	; Calling sequence:
  5313                              <1> 	;	syssetuid
  5314                              <1> 	; Arguments: -
  5315                              <1> 	;
  5316                              <1> 	; Inputs: (u.r0) - contains the process id.
  5317                              <1> 	; Outputs: -
  5318                              <1> 	; ...............................................................
  5319                              <1> 	;	
  5320                              <1> 	; Retro UNIX 8086 v1 modification: 
  5321                              <1> 	;       BL contains the (new) user ID of the current process
  5322                              <1> 
  5323                              <1> 		; movb *u.r0,r1 / move process id (number) to r1
  5324 0000D6F4 3A1D[314A0100]      <1> 	cmp	bl, [u.ruid] 
  5325                              <1> 		; cmpb r1,u.ruid / is it equal to the real user 
  5326                              <1> 			       ; / id number
  5327 0000D6FA 741E                <1> 	je	short setuid1
  5328                              <1> 		; beq 1f / yes
  5329 0000D6FC 803D[304A0100]00    <1> 	cmp	byte [u.uid], 0 ; 02/08/2013
  5330                              <1> 		; tstb u.uid / no, is current user the super user?
  5331                              <1> 	;ja	error
  5332                              <1> 		; bne error4 / no, error
  5333 0000D703 760F                <1> 	jna	short setuid0
  5334 0000D705 C705[484A0100]0B00- <1> 	mov	dword [u.error], ERR_NOT_SUPERUSER  ; 11
  5334 0000D70D 0000                <1>
  5335                              <1> 				;  'permission denied !' error
  5336 0000D70F E986E6FFFF          <1> 	jmp	error
  5337                              <1> setuid0:
  5338 0000D714 881D[314A0100]      <1> 	mov	[u.ruid], bl
  5339                              <1> setuid1: ; 1:
  5340 0000D71A 881D[304A0100]      <1> 	mov	[u.uid], bl ; 02/08/2013
  5341                              <1> 		; movb r1,u.uid / put process id in u.uid
  5342                              <1> 		; movb r1,u.ruid / put process id in u.ruid
  5343 0000D720 E995E6FFFF          <1> 	jmp	sysret
  5344                              <1> 		; br sysret4 / system return
  5345                              <1> 
  5346                              <1> sysgetuid: ; < get user id >
  5347                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5348                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  5349                              <1> 	;
  5350                              <1> 	; 'sysgetuid' returns the real user ID of the current process.
  5351                              <1> 	; The real user ID identifies the person who is logged in,
  5352                              <1> 	; in contradistinction to the effective user ID, which
  5353                              <1> 	; determines his access permission at each moment. It is thus
  5354                              <1> 	; useful to programs which operate using the 'set user ID'
  5355                              <1> 	; mode, to find out who invoked them.	
  5356                              <1> 	;
  5357                              <1> 	; Calling sequence:
  5358                              <1> 	;	syssetuid
  5359                              <1> 	; Arguments: -
  5360                              <1> 	;
  5361                              <1> 	; Inputs: -
  5362                              <1> 	; Outputs: (u.r0) - contains the real user's id.
  5363                              <1> 	; ...............................................................
  5364                              <1> 	;	
  5365                              <1> 	; Retro UNIX 8086 v1 modification: 
  5366                              <1> 	;       AL contains the real user ID at return.
  5367                              <1> 	;
  5368 0000D725 0FB605[314A0100]    <1> 	movzx 	eax, byte [u.ruid]
  5369 0000D72C A3[E4490100]        <1> 	mov	[u.r0], eax
  5370                              <1> 		; movb	u.ruid,*u.r0 / move the real user id to (u.r0)
  5371 0000D731 E984E6FFFF          <1> 	jmp	sysret
  5372                              <1> 		; br sysret4 / systerm return, sysret
  5373                              <1> 
  5374                              <1> anyi: 
  5375                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  5376                              <1> 	; Major Modification!
  5377                              <1> 	; TRDOS 386 does not permit to delete a file while it is open 
  5378                              <1> 	; The role of 'anyi' procedure has beeen changed to ensure that.
  5379                              <1> 	; 	
  5380                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  5381                              <1> 	; 25/04/2013 (Retro UNIX 8086 v1)
  5382                              <1> 	;
  5383                              <1> 	; 'anyi' is called if a file deleted while open.
  5384                              <1> 	; "anyi" checks to see if someone else has opened this file.
  5385                              <1> 	;
  5386                              <1> 	; INPUTS ->
  5387                              <1> 	;    r1 - contains an i-number
  5388                              <1> 	;    fsp - start of table containing open files
  5389                              <1> 	;
  5390                              <1> 	; OUTPUTS ->
  5391                              <1> 	;    "deleted" flag set in fsp entry of another occurrence of
  5392                              <1> 	;	   this file and r2 points 1st word of this fsp entry.
  5393                              <1> 	;    if file not found - bit in i-node map is cleared
  5394                              <1> 	;    			 (i-node is freed)
  5395                              <1> 	;               all blocks related to i-node are freed
  5396                              <1> 	;	        all flags in i-node are cleared
  5397                              <1> 	; ((AX = R1)) input
  5398                              <1> 	;
  5399                              <1> 	;    (Retro UNIX Prototype : 02/12/2012, UNIXCOPY.ASM)
  5400                              <1>         ;    ((Modified registers: eDX, eCX, eBX, eSI, eDI, eBP))  
  5401                              <1> 	;
  5402                              <1> 	; / r1 contains an i-number
  5403                              <1> 
  5404                              <1> 	; TRDOS 386 (06/10/2016)
  5405                              <1> 	; 
  5406                              <1> 	; INPUT:
  5407                              <1> 	;	EAX = First Cluster
  5408                              <1> 	;	 DL = Logical DOS Drive Number
  5409                              <1> 	;
  5410                              <1> 	; OUTPUT:
  5411                              <1> 	;	CF = 1 -> EBX = File Handle/Number/Index
  5412                              <1> 	;	CF = 0 -> EBX = 0
  5413                              <1> 	;
  5414                              <1> 	; Modified Registers: EBX
  5415                              <1> 
  5416 0000D736 31DB                <1> 	xor	ebx, ebx
  5417                              <1> anyi_0: 
  5418 0000D738 80BB[D2440100]00    <1> 	cmp	byte [ebx+OF_MODE], 0 ; 0 = empty entry
  5419 0000D73F 770A                <1> 	ja	short anyi_2 ; 1 (r), 2 (w) or 3 (r&w)
  5420                              <1> anyi_1:
  5421 0000D741 FEC3                <1> 	inc	bl
  5422 0000D743 80FB0A              <1> 	cmp	bl, OPENFILES ; max. count of open files
  5423 0000D746 72F0                <1> 	jb	short anyi_0
  5424 0000D748 31C0                <1> 	xor	eax, eax
  5425 0000D74A C3                  <1> 	retn 
  5426                              <1> anyi_2:
  5427 0000D74B 3A93[C8440100]      <1> 	cmp	dl, [ebx+OF_DRIVE]
  5428 0000D751 75EE                <1> 	jne	short anyi_1
  5429 0000D753 66C1E302            <1> 	shl	bx, 2 ; *4 (dword offset)
  5430 0000D757 3B83[A0440100]      <1> 	cmp	eax, [ebx+OF_FCLUSTER]
  5431 0000D75D 7406                <1> 	je	short anyi_3
  5432 0000D75F 66C1EB02            <1> 	shr	bx, 2 ; /4 (byte offset)
  5433 0000D763 EBDC                <1> 	jmp	short anyi_1 	
  5434                              <1> anyi_3:
  5435 0000D765 66C1EB02            <1> 	shr	bx, 2 ; /4 (bytes offset) (index)
  5436 0000D769 F9                  <1> 	stc
  5437 0000D76A C3                  <1> 	retn
  5438                              <1> 
  5439                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - u7.s
  5440                              <1> ; Last Modification: 14/11/2015
  5441                              <1> 
  5442                              <1> sysmount: ; / mount file system
  5443                              <1> 	; 24/10/2016 - TRDOS 386 (TRDOS v2.0)
  5444                              <1> 	; temporary !
  5445 0000D76B B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; drive not ready !
  5446 0000D770 A3[484A0100]        <1>         mov     [u.error], eax
  5447 0000D775 A3[E4490100]        <1>         mov     [u.r0], eax 
  5448 0000D77A E91BE6FFFF          <1> 	jmp	error
  5449                              <1> 
  5450                              <1> sysumount: ; / special dismount file system
  5451                              <1> 	; 24/10/2016 - TRDOS 386 (TRDOS v2.0)
  5452                              <1> 	; temporary !
  5453 0000D77F B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; drive not ready !
  5454 0000D784 A3[484A0100]        <1>         mov     [u.error], eax
  5455 0000D789 A3[E4490100]        <1>         mov     [u.r0], eax 
  5456 0000D78E E907E6FFFF          <1> 	jmp	error
  5457                              <1> 
  5458                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - SYS9.INC
  5459                              <1> ; Last Modification: 09/12/2015
  5460                              <1> 
  5461                              <1> syssleep:
  5462                              <1> 	; 29/06/2015 - (Retro UNIX 386 v1)
  5463                              <1> 	; 11/06/2014 - (Retro UNIX 8086 v1)
  5464                              <1> 	;
  5465                              <1> 	; Retro UNIX 8086 v1 feature only
  5466                              <1> 	; (INPUT -> none)
  5467                              <1> 	;
  5468 0000D793 0FB61D[334A0100]    <1> 	movzx	ebx, byte [u.uno] ; process number
  5469 0000D79A 8AA3[FF460100]      <1> 	mov	ah, [ebx+p.ttyc-1] ; current/console tty
  5470 0000D7A0 E8C3110000          <1> 	call	sleep
  5471 0000D7A5 E910E6FFFF          <1> 	jmp	sysret
  5472                              <1> 
  5473                              <1> _vp_clr:
  5474                              <1> 	; Reset/Clear Video Page
  5475                              <1> 	;
  5476                              <1> 	; 30/06/2015 - (Retro UNIX 386 v1)
  5477                              <1> 	; 21/05/2013 - 30/10/2013(Retro UNIX 8086 v1) (U0.ASM)
  5478                              <1> 	;
  5479                              <1> 	; Retro UNIX 8086 v1 feature only !
  5480                              <1> 	;
  5481                              <1> 	; INPUTS -> 
  5482                              <1> 	;   BH = video page number	 
  5483                              <1> 	;
  5484                              <1> 	; OUTPUT ->
  5485                              <1> 	;   none
  5486                              <1> 	; ((Modified registers: eAX, BH, eCX, eDX, eSI, eDI))
  5487                              <1> 	;
  5488                              <1> 	; 04/12/2013
  5489 0000D7AA 28C0                <1> 	sub	al, al
  5490                              <1> 	; al = 0 (clear video page)
  5491                              <1> 	; bh = video page ; 13/05/2016
  5492 0000D7AC B407                <1> 	mov	ah, 07h
  5493                              <1> 	; ah = 7 (attribute/color)
  5494 0000D7AE 6631C9              <1> 	xor 	cx, cx ; 0, left upper column (cl) & row (cl)
  5495 0000D7B1 66BA4F18            <1> 	mov	dx, 184Fh ; right lower column & row (dl=24, dh=79)
  5496 0000D7B5 E84142FFFF          <1> 	call	_scroll_up
  5497                              <1> 	; bh = video page
  5498 0000D7BA 6631D2              <1> 	xor	dx, dx ; 0 (cursor position) 
  5499 0000D7BD E97745FFFF          <1> 	jmp 	_set_cpos
  5500                              <1> 
  5501                              <1> sysmsg:
  5502                              <1> 	; 13/05/2016
  5503                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  5504                              <1> 	; 01/07/2015 - 11/11/2015 (Retro UNIX 386 v1)
  5505                              <1> 	; Print user-application message on user's console tty
  5506                              <1> 	;
  5507                              <1> 	; Input -> EBX = Message address
  5508                              <1> 	;	   ECX = Message length (max. 255)
  5509                              <1> 	;	   DL = Color (IBM PC Rombios color attributes)
  5510                              <1> 	;
  5511 0000D7C2 81F9FF000000        <1> 	cmp	ecx, MAX_MSG_LEN ; 255
  5512 0000D7C8 0F87ECE5FFFF        <1> 	ja	sysret ; nothing to do with big message size
  5513 0000D7CE 08C9                <1> 	or	cl, cl
  5514 0000D7D0 0F84E4E5FFFF        <1> 	jz	sysret
  5515 0000D7D6 20D2                <1> 	and	dl, dl
  5516 0000D7D8 7502                <1> 	jnz	short sysmsg0
  5517 0000D7DA B207                <1> 	mov	dl, 07h ; default color
  5518                              <1> 		; (black background, light gray character) 
  5519                              <1> sysmsg0:
  5520 0000D7DC 891D[044A0100]      <1> 	mov	[u.base], ebx
  5521 0000D7E2 8815[D7330100]      <1> 	mov	[ccolor], dl ; color attributes
  5522 0000D7E8 89E5                <1> 	mov	ebp, esp
  5523 0000D7EA 31DB                <1> 	xor	ebx, ebx ; 0
  5524 0000D7EC 891D[0C4A0100]      <1> 	mov	[u.nread], ebx ; 0
  5525                              <1> 	;
  5526 0000D7F2 381D[464A0100]      <1> 	cmp	[u.kcall], bl ; 0
  5527 0000D7F8 7769                <1> 	ja	short sysmsgk ; Temporary (01/07/2015)
  5528                              <1> 	;
  5529 0000D7FA 890D[084A0100]      <1> 	mov	[u.count], ecx
  5530 0000D800 41                  <1> 	inc	ecx ; + 00h ; ASCIIZ
  5531 0000D801 29CC                <1> 	sub	esp, ecx
  5532 0000D803 89E7                <1> 	mov	edi, esp
  5533 0000D805 89E6                <1> 	mov	esi, esp
  5534 0000D807 66891D[444A0100]    <1> 	mov	[u.pcount], bx ; reset page (phy. addr.) counter
  5535                              <1> 	; 11/11/2015
  5536 0000D80E 8A25[144A0100]      <1> 	mov 	ah, [u.ttyp] ; recent open tty
  5537                              <1> 	; 0 = none
  5538 0000D814 FECC                <1> 	dec	ah
  5539 0000D816 790C                <1> 	jns	short sysmsg1 
  5540 0000D818 8A1D[334A0100]      <1> 	mov	bl, [u.uno] ; process number	
  5541 0000D81E 8AA3[FF460100]      <1> 	mov	ah, [ebx+p.ttyc-1] ; user's (process's) console tty
  5542                              <1> sysmsg1:
  5543 0000D824 8825[164A0100]      <1> 	mov	[u.ttyn], ah
  5544                              <1> sysmsg2:
  5545 0000D82A E811080000          <1> 	call	cpass
  5546 0000D82F 7416                <1> 	jz	short sysmsg5
  5547 0000D831 AA                  <1> 	stosb
  5548 0000D832 20C0                <1> 	and	al, al
  5549 0000D834 75F4                <1> 	jnz	short sysmsg2
  5550                              <1> sysmsg3:
  5551 0000D836 80FC07              <1> 	cmp	ah, 7 ; tty number
  5552 0000D839 7711                <1> 	ja	short sysmsg6 ; serial port
  5553 0000D83B E83E000000          <1> 	call	print_cmsg
  5554                              <1> sysmsg4:
  5555 0000D840 89EC                <1> 	mov	esp, ebp	
  5556 0000D842 E973E5FFFF          <1> 	jmp	sysret
  5557                              <1> sysmsg5:
  5558 0000D847 C60700              <1> 	mov	byte [edi], 0
  5559 0000D84A EBEA                <1> 	jmp	short sysmsg3
  5560                              <1> sysmsg6:
  5561 0000D84C 8A06                <1> 	mov	al, [esi]
  5562 0000D84E E812110000          <1> 	call	sndc
  5563 0000D853 72EB                <1> 	jc	short sysmsg4
  5564 0000D855 803E00              <1> 	cmp	byte [esi], 0  ; 0 is stop character
  5565 0000D858 76E6                <1> 	jna	short sysmsg4
  5566 0000D85A 46                  <1> 	inc 	esi
  5567 0000D85B 8A25[164A0100]      <1> 	mov	ah, [u.ttyn]
  5568 0000D861 EBE9                <1> 	jmp	short sysmsg6
  5569                              <1> 
  5570                              <1> sysmsgk: ; Temporary (01/07/2015)
  5571                              <1> 	; The message has been sent by Kernel (ASCIIZ string)
  5572                              <1> 	; (ECX -character count- will not be considered)
  5573 0000D863 8B35[044A0100]      <1> 	mov	esi, [u.base]
  5574 0000D869 8A25[D6330100]      <1> 	mov	ah, [ptty] ; present/current screen (video page)
  5575 0000D86F 8825[164A0100]      <1> 	mov	[u.ttyn], ah
  5576 0000D875 C605[464A0100]00    <1> 	mov	byte [u.kcall], 0
  5577 0000D87C EBB8                <1> 	jmp	short sysmsg3
  5578                              <1> 	
  5579                              <1> print_cmsg: 
  5580                              <1> 	; 13/05/2016 - TRDOS 386 (TRDOS v2.0)
  5581                              <1> 	; 01/07/2015 (Retro UNIX 386 v1)
  5582                              <1> 	;
  5583                              <1> 	; print message (on user's console tty) 
  5584                              <1> 	;	with requested color
  5585                              <1> 	;
  5586                              <1> 	; INPUTS:
  5587                              <1> 	;	esi = message address
  5588                              <1> 	;	[u.ttyn] = tty number (0 to 7)
  5589                              <1> 	;	[ccolor] = color attributes (IBM PC BIOS colors)
  5590                              <1> 	
  5591 0000D87E 8A3D[164A0100]      <1> 	mov	bh, [u.ttyn]
  5592                              <1> 	;mov	bh, ah
  5593                              <1> 
  5594 0000D884 AC                  <1> 	lodsb
  5595                              <1> pcmsg1:
  5596 0000D885 56                  <1> 	push 	esi
  5597 0000D886 8A1D[D7330100]      <1> 	mov	bl, [ccolor]
  5598                              <1> 	;mov	bh, [u.ttyn]
  5599 0000D88C E81244FFFF          <1> 	call 	_write_tty
  5600 0000D891 5E                  <1> 	pop	esi
  5601 0000D892 AC                  <1> 	lodsb
  5602 0000D893 20C0                <1> 	and 	al, al  ; 0
  5603 0000D895 75EE                <1> 	jnz 	short pcmsg1
  5604 0000D897 C3                  <1> 	retn
  5605                              <1> 
  5606                              <1> sysgeterr:
  5607                              <1> 	; 09/12/2015
  5608                              <1> 	; 21/09/2015 - (Retro UNIX 386 v1 feature only!)
  5609                              <1> 	; Get last error number or page fault count
  5610                              <1> 	; (for debugging)
  5611                              <1> 	;
  5612                              <1> 	; Input -> EBX = return type
  5613                              <1> 	;	   0 = last error code (which is in 'u.error')	
  5614                              <1> 	;	   FFFFFFFFh = page fault count for running process
  5615                              <1> 	;	   FFFFFFFEh = total page fault count
  5616                              <1> 	;	   1 .. FFFFFFFDh = undefined 
  5617                              <1> 	;
  5618                              <1> 	; Output -> EAX = last error number or page fault count
  5619                              <1> 	;	   (depending on EBX input)
  5620                              <1> 	; 	
  5621 0000D898 21DB                <1> 	and 	ebx, ebx
  5622 0000D89A 750B                <1> 	jnz	short glerr_2
  5623                              <1> glerr_0:
  5624 0000D89C A1[484A0100]        <1> 	mov	eax, [u.error]
  5625                              <1> glerr_1:
  5626 0000D8A1 A3[E4490100]        <1> 	mov	[u.r0], eax
  5627 0000D8A6 C3                  <1>  	retn
  5628                              <1> glerr_2:
  5629 0000D8A7 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0, FFFFFFFEh -> FFFFFFFFh
  5630 0000D8A8 74FD                <1> 	jz	short glerr_2 ; page fault count for process
  5631 0000D8AA 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0	
  5632 0000D8AB 75EF                <1> 	jnz	short glerr_0
  5633 0000D8AD A1[9C4B0100]        <1> 	mov	eax, [PF_Count] ; total page fault count
  5634 0000D8B2 EBED                <1>         jmp     short glerr_1
  5635                              <1> glerr_3:
  5636 0000D8B4 A1[4C4A0100]        <1> 	mov 	eax, [u.pfcount]
  5637 0000D8B9 EBE6                <1> 	jmp	short glerr_1
  5638                              <1> 
  5639                              <1> load_and_run_file:
  5640                              <1> 	; 22/01/2017
  5641                              <1> 	; 07/01/2017
  5642                              <1> 	; 04/01/2017
  5643                              <1> 	; 24/10/2016
  5644                              <1> 	; 24/04/2016, 02/05/2016, 03/05/2016, 06/05/2016
  5645                              <1> 	; 23/04/2016 (TRDOS 386 = TRDOS v2.0)
  5646                              <1> 	; 23/10/2015 (Retro UNIX 386 v1, 'sysexec')
  5647                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  5648                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
  5649                              <1> 	; EAX = First Cluster number
  5650                              <1> 	; EDX = File Size
  5651                              <1> 	; ESI = Argument list address
  5652                              <1> 	; [argc] = argument count
  5653                              <1> 	; [u.nread] = argument list length
  5654                              <1> 	; [esp] = return address to the caller (*)
  5655                              <1> 	;
  5656 0000D8BB 8935[684A0100]      <1> 	mov	[argv], esi
  5657 0000D8C1 8915[714A0100]      <1> 	mov	[i.size], edx
  5658 0000D8C7 A3[6D4A0100]        <1> 	mov	[ii], eax
  5659                              <1> 
  5660                              <1> 	;sti	; 07/01/2017
  5661                              <1> 	;mov	eax, [k_page_dir]
  5662                              <1> 	;mov	[u.pgdir], eax
  5663 0000D8CC 31C0                <1> 	xor 	eax, eax ; clc ; *** ; 04/01/2017
  5664                              <1> 	;mov	[u.r0], eax ; 0 ; 07/01/2017
  5665                              <1> 
  5666                              <1> 	; 06/05/2016
  5667                              <1> 	; Set 'sysexit' return order to MainProg
  5668                              <1> 	;
  5669 0000D8CE 58                  <1> 	pop	eax ; * 'loc_load_and_run_file_8:' address
  5670                              <1> 	;; 22/01/2017
  5671                              <1> 	;;cli ; 07/01/2017
  5672 0000D8CF 8B25[44330100]      <1> 	mov	esp, [tss.esp0]
  5673                              <1> 	;
  5674                              <1> 	; 'loc_load_run_file_8' address has 
  5675                              <1> 	; 'jmp loc_file_rw_restore_retn' instruction
  5676                              <1> 	; 'loc_file_rw_restore_retn:' will return to
  5677                              <1> 	; [mainprog_return_addr] 
  5678                              <1> 	; just after 'call command_interpreter'
  5679                              <1> 	;
  5680 0000D8D5 68[4F5C0000]        <1> 	push	_end_of_mainprog ; we must not return to here !
  5681 0000D8DA FF35[2C410100]      <1> 	push	dword [mainprog_return_addr]
  5682 0000D8E0 89E5                <1> 	mov	ebp, esp ; **
  5683                              <1> 	;	
  5684 0000D8E2 9C                  <1> 	pushfd  ; EFLAGS      ; IRETD ; ***
  5685 0000D8E3 6A08                <1> 	push	KCODE ; cs    ; IRETD
  5686 0000D8E5 50                  <1> 	push	eax ; * (eip) ; IRETD
  5687 0000D8E6 8925[DC490100]      <1> 	mov	[u.sp], esp
  5688                              <1> 	;mov	byte [u.quant], time_count
  5689 0000D8EC 1E                  <1> 	push	ds
  5690 0000D8ED 06                  <1> 	push	es
  5691 0000D8EE 0FA0                <1> 	push	fs
  5692 0000D8F0 0FA8                <1> 	push	gs	
  5693                              <1> 	;mov	eax, [u.r0]
  5694 0000D8F2 29C0                <1> 	sub	eax, eax
  5695 0000D8F4 60                  <1> 	pushad
  5696 0000D8F5 68[BABD0000]        <1> 	push	sysret
  5697                              <1> 	;push	sysrel1 ; 07/01/2017
  5698 0000D8FA 8925[E0490100]      <1> 	mov	[u.usp], esp
  5699                              <1> 	;
  5700 0000D900 E85E060000          <1> 	call	wswap ; Save MainProg (process 1) 'u' structure
  5701                              <1> 		      ; and registers for return (from program)	
  5702 0000D905 89EC                <1> 	mov	esp, ebp ; **
  5703                              <1> 	;;22/01/2017
  5704                              <1> 	;;sti ; 07/01/2017
  5705 0000D907 50                  <1> 	push	eax  ; * 'loc_load_and_run_file_8:' address
  5706                              <1> 	;
  5707                              <1> 	;;; 02/05/2016
  5708                              <1> 	;;; Create a new process (parent: MainProg)	
  5709 0000D908 31F6                <1> 	xor 	esi, esi
  5710                              <1> cnpm_1: ; search p.stat table for unused process number
  5711 0000D90A 46                  <1> 	inc	esi
  5712 0000D90B 80BE[2F470100]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE
  5713                              <1> 				; is process active, unused, dead
  5714 0000D912 760B                <1> 	jna	short cnpm_2	; it's unused so branch
  5715 0000D914 6683FE10            <1> 	cmp	si, nproc 	; all processes checked
  5716 0000D918 72F0                <1> 	jb	short cnpm_1    ; no, branch back
  5717 0000D91A E9A683FFFF          <1> 	jmp	panic 
  5718                              <1> cnpm_2:
  5719 0000D91F A1[384A0100]        <1> 	mov	eax, [u.pgdir] ; page directory of MainProg
  5720 0000D924 A3[3C4A0100]        <1> 	mov	[u.ppgdir], eax ; parent's page directory
  5721 0000D929 E83D72FFFF          <1> 	call	allocate_page
  5722 0000D92E 0F829183FFFF        <1> 	jc	panic
  5723                              <1> 	; EAX = UPAGE (user structure page) address
  5724 0000D934 A3[344A0100]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
  5725 0000D939 89F7                <1> 	mov	edi, esi
  5726 0000D93B 66C1E702            <1> 	shl	di, 2
  5727 0000D93F 8987[3C470100]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
  5728 0000D945 E89B72FFFF          <1> 	call	clear_page ; 03/05/2016
  5729                              <1> 	;movzx	eax, byte [p.ttyc] ; console tty (for MainProg)
  5730 0000D94A 6629C0              <1> 	sub	ax, ax ; 0
  5731 0000D94D 668986[FF460100]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
  5732                              <1> 				   ; ah - reset child's wait channel	
  5733 0000D954 89F0                <1> 	mov	eax, esi
  5734 0000D956 A2[334A0100]        <1> 	mov	[u.uno], al ; child process number
  5735 0000D95B FE86[2F470100]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN
  5736 0000D961 66D1E6              <1> 	shl	si, 1 ; multiply si by 2 to get index into p.pid table
  5737 0000D964 66FF05[CE490100]    <1> 	inc	word [mpid] ; increment m.pid; get a new process name
  5738 0000D96B 66A1[CE490100]      <1> 	mov	ax, [mpid]
  5739 0000D971 668986[9E460100]    <1> 	mov	[esi+p.pid-2], ax ; put new process name 
  5740                              <1> 				  ; in child process' name slot
  5741                              <1> 	;mov	ax, [p.pid]  ; get process name of MainProg
  5742 0000D978 66B80100            <1> 	mov	ax, 1
  5743 0000D97C 668986[BE460100]    <1> 	mov	[esi+p.ppid-2], ax ; put parent process name 
  5744                              <1> 			           ; in parent process slot for child
  5745 0000D983 6648                <1> 	dec	ax ; 0
  5746 0000D985 66A3[144A0100]      <1> 	mov 	[u.ttyp], ax ; 0
  5747                              <1> 	;;;
  5748 0000D98B A1[6D4A0100]        <1> 	mov 	eax,  [ii]
  5749                              <1> 	; Retro UNIX 386 v1, 'sysexec' (u2.s)
  5750 0000D990 E8CD0F0000          <1> 	call	iopen
  5751                              <1> 	; 06/06/2016
  5752 0000D995 C605[294A0100]01    <1> 	mov	byte [u.pri], 1 ; normal priority
  5753                              <1> 	;
  5754 0000D99C EB0A                <1> 	jmp	short sysexec_7 ; 02/05/2016
  5755                              <1> 
  5756                              <1> sysexec_6:
  5757                              <1> 	; 04/01/2017
  5758                              <1> 	; 24/10/2016
  5759                              <1> 	;;02/05/2016
  5760                              <1> 	; 23/04/2016
  5761                              <1> 	; 18/10/2015 ('sysexec_6')
  5762                              <1> 	; 23/06/2015
  5763 0000D99E A1[384A0100]        <1> 	mov	eax, [u.pgdir] ; physical address of page directory
  5764                              <1> 	;;cmp 	eax, [k_page_dir] ; TRDOS MainProg ? 
  5765                              <1> 	;;je	short sysexec_7
  5766 0000D9A3 E8FC72FFFF          <1> 	call	deallocate_page_dir
  5767                              <1> sysexec_7:
  5768 0000D9A8 E82C72FFFF          <1> 	call	make_page_dir
  5769 0000D9AD 0F821283FFFF        <1> 	jc	panic  ; allocation error 
  5770                              <1> 		       ; after a deallocation would be nonsence !?
  5771                              <1> 	; 24/07/2015
  5772                              <1> 	; map kernel pages (1st 4MB) to PDE 0
  5773                              <1> 	;     of the user's page directory
  5774                              <1> 	;     (It is needed for interrupts!)
  5775                              <1> 	; 18/10/2015
  5776 0000D9B3 8B15[A8330100]      <1> 	mov	edx, [k_page_dir] ; Kernel's page directory
  5777 0000D9B9 8B02                <1> 	mov	eax, [edx] ; physical address of
  5778                              <1> 			   ; kernel's first page table (1st 4 MB)
  5779                              <1> 			   ; (PDE 0 of kernel's page directory)
  5780 0000D9BB 8B15[384A0100]      <1> 	mov 	edx, [u.pgdir]
  5781 0000D9C1 8902                <1> 	mov	[edx], eax ; PDE 0 (1st 4MB)
  5782                              <1> 	;
  5783                              <1> 	; 20/07/2015
  5784 0000D9C3 BB00004000          <1> 	mov	ebx, CORE ; start address = 0 (virtual) + CORE
  5785                              <1> 	; 18/10/2015
  5786 0000D9C8 BE[584A0100]        <1> 	mov	esi, pcore ; physical start address
  5787                              <1> sysexec_8:	
  5788 0000D9CD B907000000          <1> 	mov	ecx, PDE_A_USER + PDE_A_WRITE + PDE_A_PRESENT
  5789 0000D9D2 E82072FFFF          <1> 	call	make_page_table
  5790 0000D9D7 0F82E882FFFF        <1> 	jc	panic
  5791                              <1> 	;mov	ecx, PTE_A_USER + PTE_A_WRITE + PTE_A_PRESENT
  5792 0000D9DD E82372FFFF          <1> 	call	make_page ; make new page, clear and set the pte 
  5793 0000D9E2 0F82DD82FFFF        <1> 	jc	panic
  5794                              <1> 	;
  5795 0000D9E8 8906                <1> 	mov	[esi], eax ; 24/06/2015
  5796                              <1> 	; ebx = virtual address (24/07/2015)
  5797 0000D9EA E8BE77FFFF          <1> 	call 	add_to_swap_queue
  5798                              <1> 	; 18/10/2015
  5799 0000D9EF 81FE[5C4A0100]      <1> 	cmp	esi, ecore ; user's stack (last) page ?
  5800 0000D9F5 740C                <1> 	je	short sysexec_9 ; yes
  5801 0000D9F7 BE[5C4A0100]        <1> 	mov	esi, ecore  ; physical address of the last page 
  5802                              <1> 	; 20/07/2015
  5803 0000D9FC BB00F0FFFF          <1> 	mov	ebx, (ECORE - PAGE_SIZE) + CORE
  5804                              <1> 	; ebx = virtual end address + segment base address - 4K
  5805 0000DA01 EBCA                <1>         jmp     short sysexec_8
  5806                              <1> sysexec_9:
  5807                              <1> 	; 24/04/2016
  5808                              <1> 	; 18/10/2015
  5809                              <1> 	; 26/08/2015
  5810                              <1> 	; 25/06/2015
  5811                              <1> 	; move arguments from kernel stack to [ecore]
  5812                              <1> 	; (argument list/line will be copied from kernel stack
  5813                              <1> 	; frame to the last (stack) page of user's core memory)
  5814                              <1> 	; 18/10/2015
  5815 0000DA03 8B3D[5C4A0100]      <1> 	mov	edi, [ecore]
  5816 0000DA09 81C700100000        <1> 	add	edi, PAGE_SIZE
  5817 0000DA0F 0FB705[664A0100]    <1> 	movzx	eax, word [argc]
  5818 0000DA16 09C0                <1> 	or	eax, eax
  5819 0000DA18 7509                <1> 	jnz	short sysexec_10
  5820 0000DA1A 89FB                <1> 	mov 	ebx, edi
  5821 0000DA1C 83EB04              <1> 	sub	ebx, 4 
  5822 0000DA1F 8903                <1> 	mov	[ebx], eax ; 0
  5823 0000DA21 EB44                <1> 	jmp 	short sysexec_13
  5824                              <1> sysexec_10:
  5825 0000DA23 8B0D[0C4A0100]      <1> 	mov	ecx, [u.nread]
  5826                              <1> 	;mov	esi, TextBuffer
  5827 0000DA29 8B35[684A0100]      <1> 	mov	esi, [argv] ; 24/04/2016 (TRDOS 386  = TRDOS v2.0)
  5828 0000DA2F 29CF                <1> 	sub	edi, ecx ; page end address - argument list length
  5829 0000DA31 89C2                <1> 	mov	edx, eax
  5830 0000DA33 FEC2                <1> 	inc	dl ; argument count + 1 for argc value  
  5831 0000DA35 C0E202              <1> 	shl 	dl, 2  ; 4 * (argument count + 1)
  5832 0000DA38 89FB                <1> 	mov	ebx, edi
  5833 0000DA3A 80E3FC              <1> 	and	bl, 0FCh ; 32 bit (dword) alignment
  5834 0000DA3D 29D3                <1> 	sub 	ebx, edx
  5835 0000DA3F 89FA                <1> 	mov	edx, edi
  5836 0000DA41 F3A4                <1> 	rep	movsb
  5837 0000DA43 89D6                <1> 	mov 	esi, edx
  5838 0000DA45 89DF                <1> 	mov 	edi, ebx
  5839 0000DA47 BA00F0BFFF          <1> 	mov	edx, ECORE - PAGE_SIZE ; virtual addr. of the last page
  5840 0000DA4C 2B15[5C4A0100]      <1> 	sub 	edx, [ecore] ; difference (virtual - physical) 
  5841 0000DA52 AB                  <1> 	stosd	; eax = argument count	
  5842                              <1> sysexec_11:
  5843 0000DA53 89F0                <1> 	mov	eax, esi
  5844 0000DA55 01D0                <1> 	add	eax, edx
  5845 0000DA57 AB                  <1> 	stosd  ; eax = virtual address
  5846 0000DA58 FE0D[664A0100]      <1> 	dec	byte [argc]
  5847 0000DA5E 7407                <1> 	jz	short sysexec_13
  5848                              <1> sysexec_12:
  5849 0000DA60 AC                  <1> 	lodsb
  5850 0000DA61 20C0                <1> 	and	al, al
  5851 0000DA63 75FB                <1> 	jnz	short sysexec_12
  5852 0000DA65 EBEC                <1> 	jmp	short sysexec_11
  5853                              <1> sysexec_13:
  5854                              <1> 	; 24/10/2016
  5855                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
  5856                              <1> 	; 23/06/2015 - 19/10/2015 (Retro UNIX 386 v1, 'sysexec_13')
  5857                              <1> 	;
  5858                              <1> 	; moving arguments to [ecore] is OK here..
  5859                              <1> 	;
  5860                              <1> 	; ebx = beginning addres of argument list pointers
  5861                              <1> 		;	in user's stack
  5862 0000DA67 2B1D[5C4A0100]      <1> 	sub 	ebx, [ecore]
  5863 0000DA6D 81C300F0BFFF        <1> 	add     ebx, (ECORE - PAGE_SIZE)
  5864                              <1> 			; end of core - 4096 (last page)
  5865                              <1> 			; (virtual address)
  5866 0000DA73 891D[684A0100]      <1> 	mov	[argv], ebx
  5867 0000DA79 891D[104A0100]      <1> 	mov	[u.break], ebx ; available user memory
  5868                              <1> 	;
  5869 0000DA7F 29C0                <1> 	sub	eax, eax
  5870 0000DA81 C705[084A0100]2000- <1> 	mov	dword [u.count], 32 ; Executable file header size
  5870 0000DA89 0000                <1>
  5871 0000DA8B C705[F4490100]-     <1> 	mov	dword [u.fofp], u.off
  5871 0000DA91 [004A0100]          <1>
  5872 0000DA95 A3[004A0100]        <1> 	mov	[u.off], eax ; 0
  5873 0000DA9A A3[044A0100]        <1> 	mov	[u.base], eax ; 0, start of user's core (virtual)
  5874                              <1> 	; 24/10/2016
  5875 0000DA9F A0[6E340100]        <1> 	mov	al, [Current_Drv]
  5876 0000DAA4 A2[C6490100]        <1> 	mov	[cdev], al
  5877                              <1> 	;
  5878 0000DAA9 A1[6D4A0100]        <1> 	mov	eax, [ii] ; Fist Cluster of the Program (PRG) file
  5879                              <1> 	; EAX = First cluster of the executable file
  5880 0000DAAE E832010000          <1> 	call	readi
  5881                              <1> 
  5882 0000DAB3 8B0D[104A0100]      <1> 	mov	ecx, [u.break] ; top of user's stack (physical addr.)
  5883 0000DAB9 890D[084A0100]      <1> 	mov	[u.count], ecx ; save for overrun check
  5884                              <1> 	;
  5885 0000DABF 8B0D[0C4A0100]      <1> 	mov	ecx, [u.nread]
  5886 0000DAC5 890D[104A0100]      <1> 	mov	[u.break], ecx ; virtual address (offset from start)
  5887 0000DACB 80F920              <1> 	cmp	cl, 32
  5888 0000DACE 7540                <1>         jne     short sysexec_15
  5889                              <1> 	;:
  5890                              <1> 	; Retro UNIX 386 v1 (32 bit) executable file header format
  5891 0000DAD0 8B35[584A0100]      <1> 	mov	esi, [pcore] ; start address of user's core memory 
  5892                              <1> 		             ; (phys. start addr. of the exec. file)
  5893 0000DAD6 AD                  <1> 	lodsd
  5894 0000DAD7 663DEB1E            <1> 	cmp	ax, 1EEBh ; EBH, 1Eh -> jump to +32
  5895 0000DADB 7533                <1> 	jne	short sysexec_15
  5896 0000DADD AD                  <1> 	lodsd
  5897 0000DADE 89C1                <1> 	mov	ecx, eax ; text (code) section size
  5898 0000DAE0 AD                  <1> 	lodsd
  5899 0000DAE1 01C1                <1> 	add	ecx, eax ; + data section size (initialized data)
  5900 0000DAE3 89CB                <1> 	mov	ebx, ecx
  5901 0000DAE5 AD                  <1> 	lodsd	
  5902 0000DAE6 01C3                <1> 	add	ebx, eax ; + bss section size (for overrun checking)
  5903 0000DAE8 3B1D[084A0100]      <1> 	cmp	ebx, [u.count]
  5904 0000DAEE 7711                <1> 	ja	short sysexec_14  ; program overruns stack !
  5905                              <1> 	;
  5906                              <1> 	; add bss section size to [u.break]
  5907 0000DAF0 0105[104A0100]      <1> 	add 	[u.break], eax
  5908                              <1> 	;
  5909 0000DAF6 83E920              <1> 	sub	ecx, 32  ; header size (already loaded)
  5910                              <1> 	;cmp	ecx, [u.count]
  5911                              <1> 	;jnb	short sysexec_16
  5912 0000DAF9 890D[084A0100]      <1> 	mov	[u.count], ecx ; required read count
  5913 0000DAFF EB29                <1> 	jmp	short sysexec_16
  5914                              <1> sysexec_14:
  5915                              <1> 	; insufficient (out of) memory
  5916 0000DB01 C705[484A0100]0400- <1> 	mov	dword [u.error], ERR_MINOR_IM ; 1
  5916 0000DB09 0000                <1>
  5917 0000DB0B E98AE2FFFF          <1> 	jmp	error
  5918                              <1> sysexec_15:
  5919 0000DB10 8B15[714A0100]      <1>         mov	edx, [i.size] ; file size
  5920 0000DB16 29CA                <1> 	sub	edx, ecx ; file size - loaded bytes
  5921 0000DB18 7626                <1> 	jna	short sysexec_17 ; no need to next read
  5922 0000DB1A 01D1                <1> 	add	ecx, edx ; [i.size]
  5923 0000DB1C 3B0D[084A0100]      <1> 	cmp	ecx, [u.count] ; overrun check (!)
  5924 0000DB22 77DD                <1> 	ja	short sysexec_14
  5925 0000DB24 8915[084A0100]      <1> 	mov	[u.count], edx
  5926                              <1> sysexec_16:
  5927 0000DB2A A1[6D4A0100]        <1> 	mov	eax, [ii] ; first cluster
  5928 0000DB2F E8B1000000          <1> 	call	readi
  5929 0000DB34 8B0D[0C4A0100]      <1> 	mov	ecx, [u.nread]
  5930 0000DB3A 010D[104A0100]      <1> 	add	[u.break], ecx
  5931                              <1> sysexec_17:
  5932 0000DB40 A1[6D4A0100]        <1> 	mov	eax, [ii] ; first cluster
  5933 0000DB45 E8190E0000          <1> 	call	iclose
  5934 0000DB4A 31C0                <1> 	xor     eax, eax
  5935 0000DB4C FEC0                <1> 	inc	al
  5936 0000DB4E 66A3[2A4A0100]      <1> 	mov	[u.intr], ax ; 1 (interrupt/time-out is enabled)
  5937 0000DB54 66A3[2C4A0100]      <1> 	mov	[u.quit], ax ; 1 ('crtl+brk' signal is enabled) 
  5938 0000DB5A 833D[3C4A0100]00    <1>         cmp	dword [u.ppgdir], 0  ; is the caller MainProg (kernel) ?
  5939 0000DB61 770C                <1> 	ja	short sysexec_18 ; no, the caller is user process
  5940                              <1> 	; If the caller is kernel (MainProg), 'sysexec' will come here
  5941 0000DB63 8B15[A8330100]      <1> 	mov	edx, [k_page_dir] ; kernel's page directory
  5942 0000DB69 8915[3C4A0100]      <1> 	mov	[u.ppgdir], edx ; next time 'sysexec' must not come here 
  5943                              <1> sysexec_18:
  5944                              <1> 	; 02/05/2016
  5945                              <1> 	; 24/04/2016 (TRDOS 386 = TRDOS v2.0)
  5946                              <1> 	; 18/10/2015 (Retro UNIX 386 v1)
  5947                              <1> 	; 05/08/2015
  5948                              <1> 	; 29/07/2015
  5949 0000DB6F 8B2D[684A0100]      <1> 	mov	ebp, [argv] ; user's stack pointer must point to argument
  5950                              <1> 			    ; list pointers (argument count)
  5951 0000DB75 FA                  <1> 	cli
  5952 0000DB76 8B25[44330100]      <1>         mov     esp, [tss.esp0]  ; ring 0 (kernel) stack pointer
  5953                              <1> 	;mov   	esp, [u.sp] ; Restore Kernel stack
  5954                              <1> 			    ; for this process	 
  5955                              <1> 	;add	esp, 20 ; --> EIP, CS, EFLAGS, ESP, SS
  5956                              <1> 	;xor	eax, eax ; 0
  5957 0000DB7C FEC8                <1> 	dec	al ; eax = 0
  5958 0000DB7E 66BA2300            <1> 	mov	dx, UDATA
  5959 0000DB82 6652                <1> 	push	dx  ; user's stack segment
  5960 0000DB84 55                  <1> 	push	ebp ; user's stack pointer
  5961                              <1> 		    ; (points to number of arguments)
  5962                              <1> 	
  5963                              <1> 	; 04/01/2017
  5964                              <1> 	; MainProg comes here while [sysflg]= 0FFh
  5965                              <1> 	; (but sysexec comes here while [sysflg]= 0)
  5966 0000DB85 C605[DB490100]00    <1> 	mov	byte [sysflg], 0 ; 04/01/2017
  5967                              <1> 				 ; (timer_int sysflg control)
  5968 0000DB8C FB                  <1> 	sti
  5969 0000DB8D 9C                  <1> 	pushfd	; EFLAGS
  5970                              <1> 		; Set IF for enabling interrupts in user mode	
  5971                              <1> 	;or	dword [esp], 200h 
  5972                              <1> 	;
  5973                              <1> 	;mov	bx, UCODE
  5974                              <1> 	;push	bx ; user's code segment
  5975 0000DB8E 6A1B                <1> 	push	UCODE
  5976                              <1> 	;push	0
  5977 0000DB90 50                  <1> 	push	eax ; EIP (=0) - start address -	
  5978 0000DB91 8925[DC490100]      <1> 	mov	[u.sp], esp ; 29/07/2015
  5979                              <1> 	; 05/08/2015
  5980                              <1> 	; Remedy of a General Protection Fault during 'iretd' is here !
  5981                              <1> 	; ('push dx' would cause to general protection fault, 
  5982                              <1> 	; after 'pop ds' etc.)
  5983                              <1> 	;
  5984                              <1> 	;; push dx ; ds (UDATA)
  5985                              <1> 	;; push dx ; es (UDATA)
  5986                              <1> 	;; push dx ; fs (UDATA)
  5987                              <1> 	;; push dx ; gs (UDATA)
  5988                              <1> 	;
  5989                              <1> 	; This is a trick to prevent general protection fault
  5990                              <1> 	; during 'iretd' intruction at the end of 'sysrele' (in u1.s):
  5991 0000DB97 8EC2                <1> 	mov 	es, dx ; UDATA
  5992 0000DB99 06                  <1> 	push 	es ; ds (UDATA)
  5993 0000DB9A 06                  <1> 	push 	es ; es (UDATA)
  5994 0000DB9B 06                  <1> 	push 	es ; fs (UDATA)
  5995 0000DB9C 06                  <1> 	push	es ; gs (UDATA)
  5996 0000DB9D 66BA1000            <1> 	mov	dx, KDATA
  5997 0000DBA1 8EC2                <1> 	mov	es, dx
  5998                              <1> 	;
  5999                              <1> 	;; pushad simulation
  6000 0000DBA3 89E5                <1> 	mov	ebp, esp ; esp before pushad
  6001 0000DBA5 50                  <1> 	push	eax ; eax (0)
  6002 0000DBA6 50                  <1> 	push	eax ; ecx (0)
  6003 0000DBA7 50                  <1> 	push	eax ; edx (0)
  6004 0000DBA8 50                  <1> 	push	eax ; ebx (0)
  6005 0000DBA9 55                  <1> 	push	ebp ; esp before pushad
  6006 0000DBAA 50                  <1> 	push	eax ; ebp (0)
  6007 0000DBAB 50                  <1> 	push	eax ; esi (0)		
  6008 0000DBAC 50                  <1> 	push	eax ; edi (0)	
  6009                              <1> 	;
  6010 0000DBAD A3[E4490100]        <1> 	mov	[u.r0], eax ; eax = 0
  6011 0000DBB2 8925[E0490100]      <1> 	mov	[u.usp], esp
  6012                              <1> 
  6013                              <1> 	; 02/05/2016
  6014                              <1> 	;inc	byte [sysflg] ; 0FFh -> 0
  6015                              <1> 	;mov	byte [sysflg], 0 ; 04/01/2017
  6016 0000DBB8 0FB61D[334A0100]    <1> 	movzx	ebx, byte [u.uno]	
  6017 0000DBBF 6683BB[BE460100]01  <1> 	cmp	word [ebx+p.ppid-2], 1 ; MainProg
  6018 0000DBC7 0F87F0E1FFFF        <1> 	ja	sysret0 ; 03/05/2016
  6019 0000DBCD 68[BABD0000]        <1> 	push	sysret ; * 
  6020 0000DBD2 8925[E0490100]      <1> 	mov	[u.usp], esp
  6021 0000DBD8 E886030000          <1> 	call	wswap ; save child process 'u' structure and
  6022                              <1> 		      ; registers
  6023 0000DBDD 8305[E0490100]04    <1> 	add	dword [u.usp], 4 ; 03/05/2016 
  6024                              <1> sysexec_19: ; 02/05/2016
  6025 0000DBE4 C3                  <1> 	retn ; * 'sysret' ; byte [sysflg] -> 0FFh
  6026                              <1> 
  6027                              <1> readi:
  6028                              <1> 	; 01/05/2016
  6029                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  6030                              <1> 	; 20/05/2015 - Retro UNIX 386 v1
  6031                              <1> 	; 11/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  6032                              <1> 	;
  6033                              <1> 	; Reads from a file whose the first cluster number in EAX
  6034                              <1> 	; 
  6035                              <1> 	; INPUTS ->
  6036                              <1> 	;    EAX - First cluster number of the file
  6037                              <1> 	;    u.count - byte count user desires
  6038                              <1> 	;    u.base - points to user buffer
  6039                              <1> 	;    u.fofp - points to dword with current file offset
  6040                              <1> 	;    i.size - file size
  6041                              <1> 	;    cdev - logical dos drive number of the file
  6042                              <1> 	; OUTPUTS ->
  6043                              <1> 	;    u.count - cleared
  6044                              <1> 	;    u.nread - accumulates total bytes passed back
  6045                              <1> 	;
  6046                              <1> 	; ((EAX)) input/output
  6047                              <1> 	; (Retro UNIX Prototype : 14/12/2012 - 01/03/2013, UNIXCOPY.ASM)
  6048                              <1>         ; ((Modified registers: edx, ebx, ecx, esi, edi))  
  6049                              <1> 
  6050 0000DBE5 31D2                <1> 	xor	edx, edx ; 0
  6051 0000DBE7 8915[0C4A0100]      <1> 	mov 	[u.nread], edx ; 0
  6052 0000DBED 668915[444A0100]    <1> 	mov	[u.pcount], dx ; 19/05/2015
  6053 0000DBF4 3915[084A0100]      <1> 	cmp 	[u.count], edx ; 0
  6054 0000DBFA 7701                <1> 	ja 	short readi_1
  6055 0000DBFC C3                  <1> 	retn
  6056                              <1> readi_1:
  6057                              <1> dskr:
  6058                              <1> 	; 01/05/2016
  6059                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  6060                              <1> 	; 24/05/2015 - 12/10/2015 (Retro UNIX 386 v1)
  6061                              <1> 	; 26/04/2013 - 03/08/2013 (Retro UNIX 8086 v1)
  6062                              <1> dskr_0:
  6063 0000DBFD 8B15[714A0100]      <1>         mov	edx, [i.size]
  6064 0000DC03 8B1D[F4490100]      <1> 	mov	ebx, [u.fofp]
  6065 0000DC09 2B13                <1> 	sub	edx, [ebx]
  6066 0000DC0B 7647                <1> 	jna	short dskr_4
  6067                              <1> 	;
  6068 0000DC0D 50                  <1> 	push	eax ; 01/05/2016
  6069 0000DC0E 3B15[084A0100]      <1> 	cmp     edx, [u.count] 
  6070 0000DC14 7306                <1> 	jnb	short dskr_1
  6071 0000DC16 8915[084A0100]      <1> 	mov	[u.count], edx
  6072                              <1> dskr_1:
  6073                              <1> 	; EAX = First Cluster
  6074                              <1> 	; [Current_Drv] = Physical drive number 
  6075 0000DC1C E83B000000          <1> 	call	mget_r
  6076                              <1> 	; NOTE: in 'mget_r', relevant sector will be read in buffer
  6077                              <1> 	; if it is not already in buffer !
  6078 0000DC21 BB[A84B0100]        <1> 	mov	ebx, readi_buffer
  6079 0000DC26 803D[464A0100]00    <1> 	cmp	byte [u.kcall], 0 ; the caller is 'namei' sign (=1)
  6080 0000DC2D 770F                <1> 	ja	short dskr_3	  ; zf=0 -> the caller is 'namei'
  6081 0000DC2F 66833D[444A0100]00  <1> 	cmp	word [u.pcount], 0
  6082 0000DC37 7705                <1> 	ja	short dskr_3
  6083                              <1> dskr_2:
  6084                              <1> 	; [u.base] = virtual address to transfer (as destination address)
  6085 0000DC39 E894010000          <1> 	call	trans_addr_w ; translate virtual address to physical (w)
  6086                              <1> dskr_3:
  6087                              <1> 	; EBX (r5) = system (I/O) buffer address -physical-
  6088 0000DC3E E8F7010000          <1> 	call	sioreg
  6089 0000DC43 87F7                <1> 	xchg	esi, edi
  6090                              <1> 	; EDI = file (user data) offset
  6091                              <1> 	; ESI = sector (I/O) buffer offset
  6092                              <1> 	; ECX = byte count
  6093 0000DC45 F3A4                <1> 	rep	movsb
  6094                              <1> 	; eax = remain bytes in buffer
  6095                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
  6096 0000DC47 09C0                <1> 	or	eax, eax
  6097 0000DC49 75EE                <1> 	jnz	short dskr_2 ; (page end before system buffer end!)		
  6098 0000DC4B 58                  <1> 	pop	eax  ; (first cluster number)
  6099 0000DC4C 390D[084A0100]      <1> 	cmp	[u.count], ecx ; 0
  6100 0000DC52 77A9                <1> 	ja	short dskr_0
  6101                              <1> dskr_4:
  6102 0000DC54 C605[464A0100]00    <1> 	mov	byte [u.kcall], 0
  6103 0000DC5B C3                  <1> 	retn
  6104                              <1> 
  6105                              <1> mget_r:
  6106                              <1> 	; 24/10/2016
  6107                              <1> 	; 22/10/2016
  6108                              <1> 	; 12/10/2016
  6109                              <1> 	; 29/04/2016
  6110                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  6111                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
  6112                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  6113                              <1> 	;
  6114                              <1> 	; Get existing or (allocate) a new disk block for file
  6115                              <1> 	; 
  6116                              <1> 	; INPUTS ->
  6117                              <1> 	;    [u.fofp] = file offset pointer
  6118                              <1> 	;    EAX = First Cluster
  6119                              <1> 	;    [cdev] = Logical dos drive number 	  
  6120                              <1> 	;    ([u.off] = file offset)
  6121                              <1> 	; OUTPUTS ->
  6122                              <1> 	;    EAX = logical sector number
  6123                              <1> 	;    ESI = Logical Dos Drive Description Table address	
  6124                              <1> 	;
  6125                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI
  6126                              <1> 
  6127 0000DC5C 8B35[F4490100]      <1> 	mov     esi, [u.fofp]
  6128 0000DC62 8B1E                <1> 	mov	ebx, [esi] ; (u.off)
  6129                              <1> 
  6130 0000DC64 29C9                <1> 	sub	ecx, ecx
  6131 0000DC66 8A2D[C6490100]      <1> 	mov	ch, [cdev]
  6132                              <1> 
  6133 0000DC6C BE00010900          <1> 	mov	esi, Logical_DOSDisks
  6134 0000DC71 01CE                <1> 	add	esi, ecx
  6135                              <1> 
  6136 0000DC73 380D[E0400100]      <1> 	cmp	[readi.valid], cl ; 0
  6137 0000DC79 7649                <1> 	jna	short mget_r_0
  6138                              <1> 	
  6139 0000DC7B 3A2D[E1400100]      <1> 	cmp	ch, [readi.drv]
  6140 0000DC81 7541                <1> 	jne	short mget_r_0
  6141                              <1> 
  6142 0000DC83 3B05[F4400100]      <1> 	cmp	eax, [readi.fclust]
  6143 0000DC89 7565                <1> 	jne	short mget_r_3
  6144                              <1> 	
  6145 0000DC8B 89D8                <1> 	mov	eax, ebx ; file offset
  6146 0000DC8D 668B0D[E8400100]    <1> 	mov	cx, [readi.bpc]
  6147 0000DC94 41                  <1> 	inc	ecx ; <= 65536
  6148 0000DC95 29D2                <1> 	sub	edx, edx
  6149 0000DC97 F7F1                <1> 	div	ecx
  6150                              <1> 
  6151 0000DC99 8B3D[F0400100]      <1> 	mov	edi, [readi.c_index] ; cluster index
  6152                              <1> 
  6153 0000DC9F 39F8                <1> 	cmp	eax, edi
  6154 0000DCA1 757A                <1>         jne     short mget_r_4  ; (*)
  6155                              <1> 
  6156                              <1> 	; edx = byte offset in cluster (<= 65535)
  6157 0000DCA3 668915[EA400100]    <1> 	mov	[readi.offset], dx
  6158 0000DCAA 66C1EA09            <1> 	shr	dx, 9 ; / 512
  6159 0000DCAE 8815[E3400100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
  6160                              <1> 	
  6161 0000DCB4 A1[EC400100]        <1> 	mov	eax, [readi.cluster]  ; > 0 if [readi.valid] = 1
  6162 0000DCB9 8B15[F8400100]      <1> 	mov	edx, [readi.fs_index]
  6163 0000DCBF E99A000000          <1>         jmp     mget_r_7
  6164                              <1> 	
  6165                              <1> mget_r_0:
  6166 0000DCC4 882D[E1400100]      <1> 	mov	[readi.drv], ch ; physical drive number
  6167 0000DCCA 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  6168 0000DCCE 7707                <1> 	ja	short mget_r_1
  6169 0000DCD0 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
  6170 0000DCD3 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
  6171 0000DCD5 EB03                <1> 	jmp	short mget_r_2	
  6172                              <1> mget_r_1:
  6173 0000DCD7 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]
  6174                              <1> mget_r_2:
  6175 0000DCDA 880D[E2400100]      <1> 	mov	[readi.spc], cl  ; sectors per cluster
  6176                              <1> 	; NOTE: readi bytes per sector value is always 512 ! 
  6177 0000DCE0 66C1E109            <1> 	shl	cx, 9 ; * 512
  6178 0000DCE4 6649                <1> 	dec	cx ; bytes per cluster - 1
  6179 0000DCE6 66890D[E8400100]    <1> 	mov	[readi.bpc], cx
  6180 0000DCED 6629C9              <1> 	sub	cx, cx
  6181                              <1> mget_r_3:
  6182 0000DCF0 A3[F4400100]        <1> 	mov	[readi.fclust], eax ; first cluster (or FDT address)
  6183 0000DCF5 880D[E0400100]      <1> 	mov	[readi.valid], cl ; 0 
  6184                              <1> 	;mov	[readi.s_index], cl ; 0
  6185                              <1> 	;mov	[readi.offset], cx ; 0
  6186 0000DCFB 890D[F0400100]      <1> 	mov	[readi.c_index], ecx ; 0
  6187 0000DD01 890D[EC400100]      <1> 	mov	[readi.cluster], ecx ; 0
  6188 0000DD07 890D[E4400100]      <1> 	mov	[readi.sector], ecx ; 0
  6189                              <1> 	
  6190 0000DD0D 89D8                <1> 	mov	eax, ebx ; file offset
  6191 0000DD0F 668B0D[E8400100]    <1> 	mov	cx, [readi.bpc]
  6192 0000DD16 41                  <1> 	inc	ecx ; <= 65536
  6193 0000DD17 29D2                <1> 	sub	edx, edx
  6194 0000DD19 F7F1                <1> 	div	ecx
  6195                              <1> 	;mov	edi, [readi.c_index] ; previous cluster index
  6196 0000DD1B 29FF                <1> 	sub	edi, edi
  6197                              <1> mget_r_4:
  6198 0000DD1D A3[F0400100]        <1> 	mov	[readi.c_index], eax ; cluster index
  6199                              <1> 	; edx = byte offset in cluster (<= 65535)
  6200 0000DD22 668915[EA400100]    <1> 	mov	[readi.offset], dx
  6201 0000DD29 66C1EA09            <1> 	shr	dx, 9 ; / 512
  6202 0000DD2D 8815[E3400100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
  6203                              <1> 
  6204 0000DD33 89C1                <1> 	mov	ecx, eax ; current cluster index
  6205 0000DD35 A1[F4400100]        <1> 	mov	eax, [readi.fclust]
  6206 0000DD3A 09C9                <1> 	or	ecx, ecx ; cluster index
  6207 0000DD3C 741B                <1> 	jz	short mget_r_6
  6208                              <1> 
  6209 0000DD3E 39CF                <1> 	cmp	edi, ecx
  6210 0000DD40 7710                <1> 	ja	short mget_r_5 ; old cluster index is higher
  6211 0000DD42 8B15[EC400100]      <1> 	mov	edx, [readi.cluster]
  6212 0000DD48 21D2                <1> 	and	edx, edx
  6213 0000DD4A 7406                <1> 	jz	short mget_r_5
  6214                              <1> 	; valid 'readi' parameters (*)
  6215 0000DD4C 89D0                <1> 	mov	eax, edx
  6216 0000DD4E 29F9                <1> 	sub	ecx, edi
  6217 0000DD50 740C                <1> 	jz	short mget_r_7
  6218                              <1> mget_r_5:
  6219                              <1> 	; EAX = Beginning cluster
  6220                              <1> 	; EDX = Sector index in disk/file section
  6221                              <1> 	;	(Only for SINGLIX file system!)
  6222                              <1> 	; ECX = Cluster sequence number after the beginning cluster
  6223                              <1> 	; ESI = Logical DOS Drive Description Table address
  6224 0000DD52 E8E9DEFFFF          <1> 	call	get_cluster_by_index
  6225 0000DD57 724E                <1> 	jc	short mget_r_err
  6226                              <1> 	; EAX = Cluster number		
  6227                              <1> mget_r_6:
  6228 0000DD59 A3[EC400100]        <1> 	mov	[readi.cluster], eax ; FDT number for Singlix File System
  6229                              <1> mget_r_7:
  6230 0000DD5E 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  6231 0000DD62 765F                <1> 	jna	short mget_r_12
  6232                              <1> 
  6233 0000DD64 83E802              <1> 	sub	eax, 2
  6234 0000DD67 0FB615[E2400100]    <1> 	movzx	edx, byte [readi.spc]
  6235 0000DD6E F7E2                <1> 	mul	edx
  6236                              <1> 
  6237 0000DD70 034668              <1> 	add	eax, [esi+LD_DATABegin]
  6238 0000DD73 8A15[E3400100]      <1> 	mov	dl, [readi.s_index]
  6239 0000DD79 01D0                <1> 	add	eax, edx
  6240                              <1> mget_r_8:
  6241                              <1> 	; eax = logical sector number
  6242 0000DD7B 803D[E0400100]00    <1> 	cmp	byte [readi.valid], 0
  6243 0000DD82 7608                <1> 	jna	short mget_r_9
  6244 0000DD84 3B05[E4400100]      <1> 	cmp	eax, [readi.sector]
  6245 0000DD8A 7436                <1> 	je	short mget_r_11 ; sector is already in 'readi' buffer
  6246                              <1> mget_r_9:
  6247 0000DD8C A3[E4400100]        <1> 	mov	[readi.sector], eax
  6248 0000DD91 BB[A84B0100]        <1> 	mov	ebx, readi_buffer ; buffer address
  6249 0000DD96 B901000000          <1> 	mov	ecx, 1
  6250                              <1> 	; 29/04/2016
  6251                              <1> 	;xor	dl, dl
  6252                              <1> 
  6253                              <1> 	; EAX = Logical sector number
  6254                              <1> 	; ECX = Sector count
  6255                              <1> 	; EBX = Buffer address
  6256                              <1> 	; (EDX = 0)
  6257                              <1> 	; ESI = Logical DOS drive description table address	
  6258                              <1> 
  6259 0000DD9B E8D90B0000          <1> 	call	disk_read
  6260 0000DDA0 7314                <1> 	jnc	short mget_r_10
  6261                              <1> 
  6262                              <1> 	; 22/10/2016 (15h -> 17)
  6263 0000DDA2 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
  6264                              <1> mget_r_err:
  6265 0000DDA7 A3[484A0100]        <1> 	mov	[u.error], eax
  6266                              <1> 	; 12/10/2016
  6267 0000DDAC A3[E4490100]        <1> 	mov	[u.r0], eax
  6268 0000DDB1 E9E4DFFFFF          <1> 	jmp	error
  6269                              <1> mget_r_10:
  6270 0000DDB6 C605[E0400100]01    <1> 	mov	byte [readi.valid], 1 ; 24/10/2016
  6271 0000DDBD A1[E4400100]        <1> 	mov	eax, [readi.sector]
  6272                              <1> mget_r_11:
  6273 0000DDC2 C3                  <1> 	retn
  6274                              <1> mget_r_12:
  6275                              <1> 	; EAX = FDT number
  6276                              <1> 	; EDX = Sector index from FDT sector (0,1,2,3,4...)
  6277 0000DDC3 40                  <1> 	inc	eax ; the first data sector in FS disk section	
  6278 0000DDC4 8915[F8400100]      <1> 	mov	[readi.fs_index], edx
  6279 0000DDCA 01D0                <1> 	add	eax, edx
  6280 0000DDCC EBAD                <1> 	jmp	short mget_r_8
  6281                              <1> 
  6282                              <1> trans_addr_r:
  6283                              <1> 	; 12/10/2016
  6284                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
  6285                              <1> 	; Translate virtual address to physical address 
  6286                              <1> 	; for reading from user's memory space
  6287                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
  6288                              <1> 
  6289 0000DDCE 31D2                <1> 	xor	edx, edx ; 0 (read access sign)
  6290 0000DDD0 EB04                <1> 	jmp 	short trans_addr_rw
  6291                              <1> 
  6292                              <1> trans_addr_w:
  6293                              <1> 	; 12/10/2016
  6294                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6295                              <1> 	; Translate virtual address to physical address 
  6296                              <1> 	; for writing to user's memory space
  6297                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
  6298                              <1> 	
  6299 0000DDD2 29D2                <1> 	sub	edx, edx
  6300 0000DDD4 FEC2                <1> 	inc	dl ; 1 (write access sign)
  6301                              <1> trans_addr_rw:
  6302 0000DDD6 50                  <1> 	push	eax
  6303 0000DDD7 53                  <1> 	push	ebx
  6304 0000DDD8 52                  <1> 	push 	edx ; r/w sign (in DL)
  6305                              <1> 	;
  6306 0000DDD9 8B1D[044A0100]      <1> 	mov	ebx, [u.base]
  6307 0000DDDF E89F74FFFF          <1> 	call	get_physical_addr ; get physical address
  6308 0000DDE4 730F                <1> 	jnc	short passc_0
  6309 0000DDE6 A3[484A0100]        <1> 	mov	[u.error], eax
  6310 0000DDEB A3[E4490100]        <1> 	mov	[u.r0], eax ; 12/10/2016
  6311                              <1> 	;pop	edx
  6312                              <1> 	;pop 	ebx
  6313                              <1> 	;pop	eax
  6314 0000DDF0 E9A5DFFFFF          <1> 	jmp	error
  6315                              <1> passc_0:
  6316 0000DDF5 F6C202              <1> 	test	dl, PTE_A_WRITE ; writable page
  6317 0000DDF8 5A                  <1> 	pop	edx
  6318 0000DDF9 751C                <1> 	jnz	short passc_1
  6319                              <1> 	
  6320 0000DDFB 20D2                <1> 	and 	dl, dl
  6321 0000DDFD 7418                <1> 	jz	short passc_1
  6322                              <1> 	; read only (duplicated) page -must be copied to a new page-
  6323                              <1> 	; EBX = linear address
  6324 0000DDFF 51                  <1> 	push 	ecx
  6325 0000DE00 E81471FFFF          <1> 	call 	copy_page
  6326 0000DE05 59                  <1> 	pop	ecx
  6327 0000DE06 721E                <1> 	jc	short passc_2
  6328 0000DE08 50                  <1> 	push	eax ; physical address of the new/allocated page
  6329 0000DE09 E89F73FFFF          <1> 	call	add_to_swap_queue	
  6330 0000DE0E 58                  <1> 	pop	eax
  6331 0000DE0F 81E3FF0F0000        <1> 	and 	ebx, PAGE_OFF ; 0FFFh
  6332                              <1> 	;mov 	ecx, PAGE_SIZE
  6333                              <1> 	;sub	ecx, ebx 
  6334 0000DE15 01D8                <1> 	add	eax, ebx  
  6335                              <1> passc_1: 
  6336 0000DE17 A3[404A0100]        <1> 	mov 	[u.pbase], eax ; physical address	
  6337 0000DE1C 66890D[444A0100]    <1> 	mov	[u.pcount], cx ; remain byte count in page (1-4096)
  6338 0000DE23 5B                  <1> 	pop	ebx
  6339 0000DE24 58                  <1> 	pop	eax
  6340 0000DE25 C3                  <1> 	retn
  6341                              <1> passc_2:
  6342 0000DE26 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; "Insufficient memory !" error
  6343 0000DE2B A3[E4490100]        <1> 	mov	[u.r0], eax ; 12/10/2016
  6344 0000DE30 A3[484A0100]        <1> 	mov	dword [u.error], eax
  6345                              <1> 	;pop 	ebx
  6346                              <1> 	;pop	eax
  6347 0000DE35 E960DFFFFF          <1> 	jmp	error
  6348                              <1> 
  6349                              <1> sioreg: 
  6350                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6351                              <1> 	; 19/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
  6352                              <1> 	; 12/03/2013 - 22/07/2013 (Retro UNIX 8086 v1)
  6353                              <1> 	; INPUTS -> 
  6354                              <1> 	;     EBX = system buffer (data) address (r5)
  6355                              <1> 	;     [u.fofp] = pointer to file offset pointer
  6356                              <1> 	;     [u.base] = virtual address of the user buffer
  6357                              <1> 	;     [u.pbase] = physical address of the user buffer
  6358                              <1> 	;     [u.count] = byte count
  6359                              <1> 	;     [u.pcount] = byte count within page frame 			
  6360                              <1> 	; OUTPUTS -> 
  6361                              <1> 	;     ESI = user data offset (r1)
  6362                              <1> 	;     EDI = system (I/O) buffer offset (r2)
  6363                              <1> 	;     ECX = byte count (r3)
  6364                              <1> 	;     EAX = remain bytes after byte count within page frame
  6365                              <1> 	;	(If EAX > 0, transfer will continue from the next page)
  6366                              <1>         ;
  6367                              <1> 	; ((Modified registers:  EDX))
  6368                              <1>  
  6369 0000DE3A 8B35[F4490100]      <1>         mov     esi, [u.fofp]
  6370 0000DE40 8B3E                <1>         mov     edi, [esi]
  6371 0000DE42 89F9                <1> 	mov	ecx, edi
  6372 0000DE44 81C900FEFFFF        <1> 	or	ecx, 0FFFFFE00h
  6373 0000DE4A 81E7FF010000        <1> 	and	edi, 1FFh
  6374 0000DE50 01DF                <1> 	add	edi, ebx ; EBX = system buffer (data) address
  6375 0000DE52 F7D9                <1> 	neg	ecx
  6376 0000DE54 3B0D[084A0100]      <1> 	cmp	ecx, [u.count]
  6377 0000DE5A 7606                <1> 	jna	short sioreg_0
  6378 0000DE5C 8B0D[084A0100]      <1> 	mov	ecx, [u.count]
  6379                              <1> sioreg_0:
  6380 0000DE62 803D[464A0100]00    <1> 	cmp	byte [u.kcall], 0 
  6381 0000DE69 7613                <1> 	jna	short sioreg_1
  6382                              <1> 	 ; the caller is 'mkdir' or 'namei'
  6383 0000DE6B A1[044A0100]        <1> 	mov	eax, [u.base]
  6384 0000DE70 A3[404A0100]        <1> 	mov 	[u.pbase], eax ; physical address = virtual address
  6385 0000DE75 66890D[444A0100]    <1> 	mov	word [u.pcount], cx ; remain bytes in buffer (1 sector)
  6386 0000DE7C EB0B                <1> 	jmp	short sioreg_2
  6387                              <1> sioreg_1:
  6388 0000DE7E 0FB715[444A0100]    <1> 	movzx	edx, word [u.pcount]
  6389 0000DE85 39D1                <1> 	cmp	ecx, edx	
  6390 0000DE87 772A                <1> 	ja	short sioreg_4 ; transfer count > [u.pcount]
  6391                              <1> sioreg_2: ; 2:
  6392 0000DE89 31C0                <1> 	xor 	eax, eax
  6393                              <1> sioreg_3:
  6394 0000DE8B 010D[0C4A0100]      <1> 	add 	[u.nread], ecx
  6395 0000DE91 290D[084A0100]      <1> 	sub 	[u.count], ecx
  6396 0000DE97 010D[044A0100]      <1> 	add 	[u.base], ecx
  6397 0000DE9D 010E                <1>         add 	[esi], ecx 
  6398 0000DE9F 8B35[404A0100]      <1> 	mov	esi, [u.pbase]
  6399 0000DEA5 66290D[444A0100]    <1> 	sub	[u.pcount], cx
  6400 0000DEAC 010D[404A0100]      <1> 	add	[u.pbase], ecx
  6401 0000DEB2 C3                  <1>         retn
  6402                              <1> sioreg_4:
  6403                              <1> 	; transfer count > [u.pcount] 
  6404                              <1> 	; (ecx > edx)
  6405 0000DEB3 89C8                <1> 	mov	eax, ecx
  6406 0000DEB5 29D0                <1> 	sub	eax, edx ; remain bytes for 1 sector (block) transfer 
  6407 0000DEB7 89D1                <1> 	mov	ecx, edx ; current transfer count = [u.pcount]
  6408 0000DEB9 EBD0                <1> 	jmp	short sioreg_3
  6409                              <1> 
  6410                              <1> tswitch: ; Retro UNIX 386 v1
  6411                              <1> tswap:
  6412                              <1> 	; 16/01/2017
  6413                              <1> 	; 21/05/2016 - TRDOS 386 (TRDOS v2.0)
  6414                              <1> 	; 10/05/2015 - 01/09/2015 (Retro UNIX 386 v1)
  6415                              <1> 	; 14/04/2013 - 14/02/2014 (Retro UNIX 8086 v1)
  6416                              <1> 	; time out swap, called when a user times out.
  6417                              <1> 	; the user is put on the low priority queue.
  6418                              <1> 	; This is done by making a link from the last user
  6419                              <1> 	; on the low priority queue to him via a call to 'putlu'.
  6420                              <1> 	; then he is swapped out.
  6421                              <1> 
  6422                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 21/05/2016 **
  6423                              <1> 	;     * when a high priority (event) process will be stopped
  6424                              <1> 	;	(swapped out, swithched out/off), 'tswap/tswitch' will
  6425                              <1> 	;	not add it to a run queue. 
  6426                              <1> 	;	/// What for: Process may be already in a run queue, 
  6427                              <1> 	;	it is unspeficied state because process might be started
  6428                              <1> 	;	by a timer event which does not regard previous priority
  6429                              <1> 	;	level and run queue of the process (for fast executing!).
  6430                              <1> 	;	After the 'run for event', process will be sequenced
  6431                              <1> 	;	to run by it's actual run queue. ///
  6432                              <1> 	;
  6433                              <1> 	; Retro UNIX 386 v1 modification ->
  6434                              <1> 	;       swap (software task switch) is performed by changing
  6435                              <1> 	;	user's page directory (u.pgdir) instead of segment change
  6436                              <1> 	;	as in Retro UNIX 8086 v1.
  6437                              <1> 	;
  6438                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6439                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6440                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6441                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6442                              <1> 	;	compatibles was using 1MB segmented memory 
  6443                              <1> 	;	in 8086/8088 times.
  6444                              <1> 	;
  6445                              <1> 	; INPUTS ->
  6446                              <1> 	;    u.uno - users process number
  6447                              <1> 	;    runq+4 - lowest priority queue
  6448                              <1> 	; OUTPUTS ->
  6449                              <1> 	;    r0 - users process number
  6450                              <1> 	;    r2 - lowest priority queue address
  6451                              <1> 	;
  6452                              <1> 	; ((AX = R0, BX = R2)) output
  6453                              <1> 	; ((Modified registers: EDX, EBX, ECX, ESI, EDI))  	
  6454                              <1> 	;
  6455                              <1> 
  6456                              <1> 	NOTE:
  6457                              <1> 	;* [u.pri] priority level is specified by run queue which is process 
  6458                              <1> 	;  comes to run from.
  6459                              <1> 	;* Initial [u.pri] is 1 ('normal/regular') for programs 
  6460                              <1> 	;  (which are launched by MainProg or 'sysexec'), it is changed
  6461                              <1> 	;  to 2 ('high') by timer event, if program uses 'systimer' system call.
  6462                              <1> 	;* Program (Process) also can change it's running priority 
  6463                              <1> 	;  from 1 to 0 or up to 2 by using 'syspri' system call; but,
  6464                              <1> 	;  if program selects priority level 2 (high) for running, next time 
  6465                              <1> 	;  it is reduced to 1 (normal/regular) because 'syspri' adds this
  6466                              <1> 	;  program to 'run for normal' queue while running duration is a bit
  6467                              <1> 	;  protected from swap/switch out immediate, behalf of other high 
  6468                              <1> 	;  priority process in sequence. Program (with high priority) will not 
  6469                              <1> 	;  be swapped/switched out (by timer event) before it's time quantum 
  6470                              <1> 	;  will be elapsed, but, this will be temporary if program is not using 
  6471                              <1> 	;  timer event function.	  			 	
  6472                              <1> 
  6473                              <1> 	;For example:
  6474                              <1> 	;If a process frequently gets a timer event, it runs at high priority
  6475                              <1> 	;level but when it returns from running it returns to actual run queue,
  6476                              <1> 	;not to 'run for event' queue again.
  6477                              <1> 	;'tswap' will not change the sequence at return/stop(swap out) stage.
  6478                              <1> 	;But if priority level not high (=2, 'run for event'), 'tswap/tswitch'
  6479                              <1> 	;will add the stopping process to relevant run queue according to
  6480                              <1> 	;[u.pri] priority level.
  6481                              <1> 
  6482                              <1> 	; 16/01/2017
  6483 0000DEBB BB[D4490100]        <1> 	mov	ebx, runq+2 	; 'runq_normal' ; normal/regular priority
  6484                              <1> 	; 21/05/2016
  6485                              <1> 	;cmp	byte [u.pri], 2	; high priority (run for event) ?
  6486                              <1> 	;jnb	short swap
  6487                              <1> 	; 16/01/2017
  6488                              <1> 	; (Normal and also high/event priority processes will be added to
  6489                              <1> 	; normal priority run queue for ensuring circular running sequence!)
  6490                              <1> 	; (Timer interrupt or 'syspri' system call may change priority and run
  6491                              <1> 	; queue to high/event level.)
  6492 0000DEC0 803D[294A0100]00    <1> 	cmp	byte [u.pri], 0
  6493 0000DEC7 7702                <1> 	ja	short tswap_1	; normal priority run queue
  6494                              <1> 	;
  6495 0000DEC9 43                  <1> 	inc	ebx
  6496 0000DECA 43                  <1> 	inc	ebx		; runq+4, 'runq_background', low priority
  6497                              <1> tswap_1:
  6498 0000DECB A0[334A0100]        <1> 	mov 	al, [u.uno]
  6499                              <1> 	       	; movb u.uno,r1 / move users process number to r1
  6500                              <1> 		; mov  $runq+4,r2 
  6501                              <1> 			; / move lowest priority queue address to r2
  6502                              <1>       	; ebx = run queue
  6503 0000DED0 E8E0000000          <1> 	call 	putlu
  6504                              <1> 		; jsr r0,putlu / create link from last user on Q to 
  6505                              <1> 		             ; / u.uno's user
  6506                              <1> 
  6507                              <1> switch: ; Retro UNIX 386 v1
  6508                              <1> swap:
  6509                              <1> 	; 02/01/2017
  6510                              <1> 	; 21/05/2016
  6511                              <1> 	; 20/05/2016
  6512                              <1> 	; 02/05/2016
  6513                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6514                              <1> 	; 10/05/2015 - 02/09/2015 (Retro UNIX 386 v1)
  6515                              <1> 	; 14/04/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6516                              <1> 	;
  6517                              <1> 	; 'swap' is routine that controls the swapping of processes
  6518                              <1> 	; in and out of core.
  6519                              <1> 	;
  6520                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 20/05/2016 **
  6521                              <1> 	;     * 3 different priority level is applied 
  6522                              <1> 	;	(just as original unix v1)
  6523                              <1> 	;	1) high priority (event) run queue, 'runq_event'
  6524                              <1> 	;	2) normal priority (regular) run queue, 'runq_normal'
  6525                              <1> 	;	3) low priority (background) run queue, 'runq_backgroud'
  6526                              <1> 	;	'swap' code will run a process which has max. priority
  6527                              <1>         ;       (for earliest event at first)
  6528                              <1> 	;
  6529                              <1> 	; Retro UNIX 386 v1 modification ->
  6530                              <1> 	;       swap (software task switch) is performed by changing
  6531                              <1> 	;	user's page directory (u.pgdir) instead of segment change
  6532                              <1> 	;	as in Retro UNIX 8086 v1.
  6533                              <1> 	;
  6534                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6535                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6536                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6537                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6538                              <1> 	;	compatibles was using 1MB segmented memory 
  6539                              <1> 	;	in 8086/8088 times.
  6540                              <1> 	;
  6541                              <1> 	; INPUTS ->
  6542                              <1> 	;    runq table - contains processes to run.
  6543                              <1> 	;    p.link - contains next process in line to be run.
  6544                              <1> 	;    u.uno - process number of process in core	
  6545                              <1> 	;    s.stack - swap stack used as an internal stack for swapping.	
  6546                              <1> 	; OUTPUTS ->
  6547                              <1> 	;    (original unix v1 -> present process to its disk block)
  6548                              <1> 	;    (original unix v1 -> new process into core -> 
  6549                              <1> 	;	   Retro Unix 8086 v1 -> segment registers changed 
  6550                              <1> 	;	   for new process)
  6551                              <1> 	;    u.quant = 3 (Time quantum for a process)
  6552                              <1> 	; 	((INT 1Ch count down speed -> 18.2 times per second)	 	
  6553                              <1> 	;    RETRO UNIX 8086 v1 will use INT 1Ch (18.2 times per second)
  6554                              <1> 	;	 for now, it will swap the process if there is not
  6555                              <1> 	;	 a keyboard event (keystroke) (Int 15h, function 4Fh)
  6556                              <1> 	;	 or will count down from 3 to 0 even if there is a
  6557                              <1> 	;        keyboard event locking due to repetitive key strokes.
  6558                              <1> 	;	 u.quant will be reset to 3 for RETRO UNIX 8086 v1.
  6559                              <1> 	;
  6560                              <1> 	; ((Modified registers: EAX, EDX, EBX, ECX, ESI, EDI))  	
  6561                              <1> 
  6562                              <1> 	;NOTE:
  6563                              <1> 	;High priority queue is the first for selecting a process to run.
  6564                              <1> 	;If there is not a process in high priority level run queue,
  6565                              <1> 	;a process in normal priority run queue will be selected
  6566                              <1> 	;or a proces in low priority run queue will be selected if normal
  6567                              <1> 	;priority level run queue is empty.
  6568                              <1> 	
  6569                              <1> 	; 21/05/2016 -(3 priority levels, 3 run queues)
  6570 0000DED5 BE[D2490100]        <1> 	mov	esi, runq ; 'runq_event' ; high priority, 'run for event'
  6571 0000DEDA C605[3C410100]03    <1> 	mov	byte [priority], 3 ; high priority + 1
  6572 0000DEE1 31DB                <1> 	xor	ebx, ebx ; 02/01/2017
  6573                              <1> swap_0: ; 1: / search runq table for highest priority process
  6574 0000DEE3 66AD                <1> 	lodsw  ; mov ax, [esi], add esi+2
  6575                              <1> 	;xor	ebx, ebx ; 02/05/2016
  6576 0000DEE5 6621C0              <1> 	and 	ax, ax ; are there any processes to run in this Q entry
  6577 0000DEE8 750E                <1> 	jnz	short swap_2 
  6578                              <1> 	; 21/05/2026
  6579                              <1> 	; runq_normal = runq+2, runq_background = runq+4
  6580 0000DEEA FE0D[3C410100]      <1> 	dec	byte [priority] ; 3 -> 3, 2 -> 1, 1-> 0
  6581 0000DEF0 75F1                <1> 	jnz	short swap_0	
  6582                              <1> 	;cmp	esi, runq+6  ; if zero compare address to end of table
  6583                              <1> 	;jb	short swap_0 ; if not at end, go back
  6584                              <1> swap_1:
  6585                              <1> 	; 02/05/2016
  6586                              <1> 	; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
  6587                              <1> 	; No user process to run...
  6588                              <1> 	; Run the kernel process... MainProg: Internal Command Interpreter  
  6589 0000DEF2 FEC0                <1> 	inc	al ; mov al, 1  ; process number of MainProg
  6590 0000DEF4 FEC3                <1> 	inc	bl ; mov bl, al ; 1
  6591 0000DEF6 EB1E                <1> 	jmp	short swap_4
  6592                              <1> swap_2:
  6593                              <1> 	; 21/05/2016
  6594 0000DEF8 FE0D[3C410100]      <1> 	dec	byte [priority] ; priority level of present user/process
  6595                              <1> 			        ; 0, 1, 2	   
  6596 0000DEFE 4E                  <1> 	dec	esi
  6597 0000DEFF 4E                  <1>         dec     esi
  6598                              <1> 	;
  6599 0000DF00 88C3                <1> 	mov	bl, al
  6600 0000DF02 38E0                <1> 	cmp	al, ah ; is there only 1 process in the queue to be run
  6601 0000DF04 740A                <1> 	je	short swap_3 ; yes
  6602 0000DF06 8AA3[1F470100]      <1> 	mov	ah, [ebx+p.link-1] 
  6603 0000DF0C 8826                <1>        	mov	[esi], ah ; move next process in line into run queue
  6604 0000DF0E EB06                <1> 	jmp	short swap_4
  6605                              <1> swap_3: 
  6606 0000DF10 6631D2              <1> 	xor	dx, dx
  6607 0000DF13 668916              <1> 	mov	[esi], dx ; zero the entry; no processes on the Q
  6608                              <1> swap_4: 
  6609 0000DF16 8A25[334A0100]      <1> 	mov 	ah, [u.uno]
  6610 0000DF1C 38C4                <1> 	cmp	ah, al ;is this process the same as the process in core?
  6611 0000DF1E 743B                <1>        	je	short swap_8 ; yes, don't have to swap
  6612 0000DF20 08E4                <1> 	or	ah, ah  ; is the process # = 0
  6613 0000DF22 740D                <1>        	jz	short swap_6 ; 'sysexit'
  6614                              <1> 	;cmp	ah, al ;is this process the same as the process in core?
  6615                              <1>        	;je	short swap_8 ; yes, don't have to swap
  6616 0000DF24 8925[E0490100]      <1> 	mov	[u.usp], esp ; return  address for 'syswait' & 'sleep'
  6617 0000DF2A E834000000          <1> 	call	wswap   ; write out core to disk
  6618 0000DF2F EB1C                <1> 	jmp 	short swap_7
  6619                              <1> swap_6:
  6620                              <1> 	; Deallocate memory pages belong to the process
  6621                              <1> 	; which is being terminated.
  6622                              <1> 	; (Retro UNIX 386 v1 modification !)
  6623                              <1> 	;
  6624 0000DF31 53                  <1> 	push	ebx
  6625 0000DF32 A1[384A0100]        <1> 	mov 	eax, [u.pgdir]  ; page directory of the process
  6626 0000DF37 8B1D[3C4A0100]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  6627 0000DF3D E8626DFFFF          <1> 	call	deallocate_page_dir
  6628 0000DF42 A1[344A0100]        <1> 	mov	eax, [u.upage] ; 'user' structure page of the process
  6629 0000DF47 E8FD6DFFFF          <1> 	call	deallocate_page
  6630 0000DF4C 5B                  <1> 	pop	ebx
  6631                              <1> swap_7: 
  6632 0000DF4D C0E302              <1> 	shl	bl, 2 ; * 4 
  6633 0000DF50 8B83[3C470100]      <1> 	mov	eax, [ebx+p.upage-4] ; the 'u' page of the new process
  6634 0000DF56 E831000000          <1> 	call	rswap ; read new process into core
  6635                              <1> swap_8: 
  6636                              <1> 	; Retro UNIX  8086 v1 modification !
  6637 0000DF5B C605[284A0100]04    <1> 	mov	byte [u.quant], time_count 
  6638 0000DF62 C3                  <1> 	retn
  6639                              <1> 
  6640                              <1> wswap:  ; < swap out, swap to disk >
  6641                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6642                              <1> 	; 09/05/2015 (Retro UNIX 386 v1)
  6643                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6644                              <1> 	; 'wswap' writes out the process that is in core onto its 
  6645                              <1> 	; appropriate disk area.
  6646                              <1> 	;
  6647                              <1> 	; Retro UNIX 386 v1 modification ->
  6648                              <1> 	;       User (u) structure content and the user's register content
  6649                              <1> 	;	will be copied to the process's/user's UPAGE (a page for
  6650                              <1> 	;	saving 'u' structure and user registers for task switching).
  6651                              <1> 	;	u.usp - points to kernel stack address which contains
  6652                              <1> 	;		user's registers while entering system call.  
  6653                              <1> 	;	u.sp  - points to kernel stack address 
  6654                              <1> 	;		to return from system call -for IRET-.
  6655                              <1> 	;	[u.usp]+32+16 = [u.sp] 
  6656                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
  6657                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
  6658                              <1> 	;
  6659                              <1> 	; Retro UNIX 8086 v1 modification ->
  6660                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6661                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6662                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6663                              <1> 	;	compatibles was using 1MB segmented memory 
  6664                              <1> 	;	in 8086/8088 times.
  6665                              <1> 	;
  6666                              <1> 	; INPUTS ->
  6667                              <1> 	;    u.break - points to end of program
  6668                              <1> 	;    u.usp - stack pointer at the moment of swap
  6669                              <1> 	;    core - beginning of process program		
  6670                              <1> 	;    ecore - end of core 	
  6671                              <1> 	;    user - start of user parameter area		
  6672                              <1> 	;    u.uno - user process number	
  6673                              <1> 	;    p.dska - holds block number of process	
  6674                              <1> 	; OUTPUTS ->
  6675                              <1> 	;    swp I/O queue
  6676                              <1> 	;    p.break - negative word count of process 
  6677                              <1> 	;    r1 - process disk address	
  6678                              <1> 	;    r2 - negative word count
  6679                              <1> 	;
  6680                              <1> 	; RETRO UNIX 8086 v1 input/output:
  6681                              <1> 	;
  6682                              <1> 	; INPUTS ->
  6683                              <1> 	;    u.uno - process number (to be swapped out)
  6684                              <1> 	; OUTPUTS ->
  6685                              <1> 	;    none
  6686                              <1> 	;
  6687                              <1> 	;   ((Modified registers: ECX, ESI, EDI))  
  6688                              <1> 	;
  6689 0000DF63 8B3D[344A0100]      <1> 	mov	edi, [u.upage] ; process's user (u) structure page addr
  6690 0000DF69 B91F000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
  6691 0000DF6E BE[DC490100]        <1> 	mov	esi, user ; active user (u) structure	
  6692 0000DF73 F3A5                <1> 	rep	movsd
  6693                              <1> 	;
  6694 0000DF75 8B35[E0490100]      <1> 	mov	esi, [u.usp] ; esp (system stack pointer, 
  6695                              <1> 			     ;      points to user registers)
  6696 0000DF7B 8B0D[DC490100]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
  6697                              <1> 			     ; (for IRET)
  6698                              <1> 			     ; [u.sp] -> EIP (user)
  6699                              <1> 			     ; [u.sp+4]-> CS (user)
  6700                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
  6701                              <1> 			     ; [u.sp+12] -> ESP (user)
  6702                              <1> 			     ; [u.sp+16] -> SS (user)	
  6703 0000DF81 29F1                <1> 	sub	ecx, esi     ; required space for user registers
  6704 0000DF83 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
  6705                              <1> 			     ; (for IRET) 	
  6706 0000DF86 C1E902              <1> 	shr	ecx, 2	     		
  6707 0000DF89 F3A5                <1> 	rep	movsd
  6708 0000DF8B C3                  <1> 	retn
  6709                              <1> 
  6710                              <1> rswap:  ; < swap in, swap from disk >
  6711                              <1> 	; 15/01/2017
  6712                              <1> 	; 14/01/2017
  6713                              <1> 	; 21/05/2016
  6714                              <1> 	; 03/05/2016
  6715                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6716                              <1> 	; 09/05/2015 - 15/09/2015 (Retro UNIX 386 v1)
  6717                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6718                              <1> 	; 'rswap' reads a process whose number is in r1, 
  6719                              <1> 	; from disk into core.
  6720                              <1> 	;
  6721                              <1> 	; Retro UNIX 386 v1 modification ->
  6722                              <1> 	;       User (u) structure content and the user's register content
  6723                              <1> 	;	will be restored from process's/user's UPAGE (a page for
  6724                              <1> 	;	saving 'u' structure and user registers for task switching).
  6725                              <1> 	;	u.usp - points to kernel stack address which contains
  6726                              <1> 	;		user's registers while entering system call.  
  6727                              <1> 	;	u.sp  - points to kernel stack address 
  6728                              <1> 	;		to return from system call -for IRET-.
  6729                              <1> 	;	[u.usp]+32+16 = [u.sp] 
  6730                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
  6731                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
  6732                              <1> 	;
  6733                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6734                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6735                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6736                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6737                              <1> 	;	compatibles was using 1MB segmented memory 
  6738                              <1> 	;	in 8086/8088 times.
  6739                              <1> 	;
  6740                              <1> 	; INPUTS ->
  6741                              <1> 	;    r1 - process number of process to be read in
  6742                              <1> 	;    p.break - negative of word count of process 
  6743                              <1> 	;    p.dska - disk address of the process		
  6744                              <1> 	;    u.emt - determines handling of emt's 	
  6745                              <1> 	;    u.ilgins - determines handling of illegal instructions		
  6746                              <1> 	; OUTPUTS ->
  6747                              <1> 	;    8 = (u.ilgins)
  6748                              <1> 	;    24 = (u.emt)
  6749                              <1> 	;    swp - bit 10 is set to indicate read 
  6750                              <1> 	;		(bit 15=0 when reading is done)	
  6751                              <1> 	;    swp+2 - disk block address
  6752                              <1> 	;    swp+4 - negative word count 	
  6753                              <1> 	;      ((swp+6 - address of user structure)) 
  6754                              <1> 	;
  6755                              <1> 	; RETRO UNIX 8086 v1 input/output:
  6756                              <1> 	;
  6757                              <1> 	; INPUTS ->
  6758                              <1> 	;    AL	- new process number (to be swapped in)	 
  6759                              <1> 	; OUTPUTS ->
  6760                              <1> 	;    none
  6761                              <1> 	;
  6762                              <1> 	;   ((Modified registers: EAX, ECX, ESI, EDI, ESP)) 
  6763                              <1> 	;
  6764                              <1> 	; Retro UNIX 386 v1 - modification ! 14/05/2015
  6765 0000DF8C 89C6                <1> 	mov	esi, eax  ; process's user (u) structure page addr
  6766 0000DF8E B91F000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
  6767 0000DF93 BF[DC490100]        <1> 	mov	edi, user ; active user (u) structure	
  6768 0000DF98 F3A5                <1> 	rep	movsd
  6769 0000DF9A 58                  <1> 	pop	eax	; 'rswap' return address
  6770                              <1> 	; 
  6771                              <1> 	;cli
  6772 0000DF9B 8B3D[E0490100]      <1> 	mov	edi, [u.usp] ; esp (system stack pointer, 
  6773                              <1> 			     ;     points to user registers)
  6774 0000DFA1 89FC                <1> 	mov	esp, edi     ; 14/01/2017
  6775 0000DFA3 8B0D[DC490100]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
  6776                              <1> 			     ; (for IRET)
  6777                              <1> 			     ; [u.sp] -> EIP (user)
  6778                              <1> 			     ; [u.sp+4]-> CS (user)
  6779                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
  6780                              <1> 			     ; [u.sp+12] -> ESP (user)
  6781                              <1> 			     ; [u.sp+16] -> SS (user)		
  6782 0000DFA9 29F9                <1> 	sub	ecx, edi     ; required space for user registers
  6783 0000DFAB 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
  6784                              <1> 			     ; (for IRET) 	
  6785 0000DFAE C1E902              <1> 	shr	ecx, 2	       		
  6786 0000DFB1 F3A5                <1> 	rep	movsd
  6787                              <1> 	;mov	esp, [u.usp] ; 15/09/2015
  6788                              <1> 	;sti
  6789 0000DFB3 50                  <1> 	push	eax	; 'rswap' return address
  6790 0000DFB4 C3                  <1> 	retn
  6791                              <1> 
  6792                              <1> putlu: 
  6793                              <1> 	; 20/05/2016
  6794                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6795                              <1> 	; 10/05/2015 - 12/09/2015 (Retro UNIX 386 v1)
  6796                              <1> 	; 15/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
  6797                              <1> 	; 'putlu' is called with a process number in r1 and a pointer
  6798                              <1> 	; to lowest priority Q (runq+4) in r2. A link is created from
  6799                              <1> 	; the last process on the queue to process in r1 by putting
  6800                              <1> 	; the process number in r1 into the last process's link.
  6801                              <1> 	;
  6802                              <1> 	; INPUTS ->
  6803                              <1> 	;    r1 - user process number
  6804                              <1> 	;    r2 - points to lowest priority queue 
  6805                              <1> 	;    p.dska - disk address of the process		
  6806                              <1> 	;    u.emt - determines handling of emt's 	
  6807                              <1> 	;    u.ilgins - determines handling of illegal instructions		
  6808                              <1> 	; OUTPUTS ->
  6809                              <1> 	;    r3 - process number of last process on the queue upon
  6810                              <1> 	;	  entering putlu
  6811                              <1> 	;    p.link-1 + r3 - process number in r1
  6812                              <1> 	;    r2 - points to lowest priority queue
  6813                              <1> 	;
  6814                              <1> 	; ((Modified registers: EDX, EBX)) 
  6815                              <1> 	;
  6816                              <1> 	; / r1 = user process no.; r2 points to lowest priority queue
  6817                              <1> 
  6818                              <1> 	; EBX = r2
  6819                              <1> 	; EAX = r1 (AL=r1b)
  6820                              <1> 
  6821                              <1> 	; 20/05/2016
  6822                              <1> 	; AL = process number (1 to 16) // Retro UNIX 8086, 386 v1 // 
  6823                              <1> 	;     (max. 16 processes available for current kernel version) 
  6824                              <1> 	; EBX = run queue address ; 20/05/2016 (TRDOS 386)
  6825                              <1> 		; which is one of following addresses:
  6826                              <1> 		;  1) 'runq_event' high priority run queue	 	
  6827                              <1> 		;  2) 'runq_normal' normal/regular priority run queue
  6828                              <1> 		;  3) 'runq_background' low priority run queue
  6829                              <1> 
  6830                              <1> 	;mov	ebx, runq
  6831 0000DFB5 0FB613              <1> 	movzx  	edx, byte [ebx]
  6832 0000DFB8 43                  <1> 	inc	ebx
  6833 0000DFB9 20D2                <1> 	and	dl, dl
  6834                              <1> 		; tstb (r2)+ / is queue empty?
  6835 0000DFBB 740A                <1>        	jz	short putlu_1
  6836                              <1> 		; beq 1f / yes, branch
  6837 0000DFBD 8A13                <1> 	mov 	dl, [ebx] ; 12/09/2015
  6838                              <1> 		; movb (r2),r3 / no, save the "last user" process number
  6839                              <1> 			     ; / in r3
  6840 0000DFBF 8882[1F470100]      <1>        	mov	[edx+p.link-1], al
  6841                              <1> 		; movb r1,p.link-1(r3) / put pointer to user on 
  6842                              <1> 			     ; / "last users" link
  6843 0000DFC5 EB03                <1> 	jmp	short putlu_2
  6844                              <1> 		; br 2f /
  6845                              <1> putlu_1: ; 1:
  6846 0000DFC7 8843FF              <1> 	mov	[ebx-1], al
  6847                              <1>        		; movb r1,-1(r2) / user is only user; 
  6848                              <1> 			    ; / put process no. at beginning and at end
  6849                              <1> putlu_2: ; 2: 
  6850 0000DFCA 8803                <1> 	mov	[ebx], al
  6851                              <1>        		; movb r1,(r2) / user process in r1 is now the last entry
  6852                              <1> 			     ; / on the queue
  6853 0000DFCC 88C2                <1> 	mov	dl, al
  6854 0000DFCE 88B2[1F470100]      <1>         mov     [edx+p.link-1], dh ; 0
  6855                              <1> 		; dec r2 / restore r2
  6856 0000DFD4 C3                  <1>         retn
  6857                              <1> 		; rts r0
  6858                              <1> sysver:
  6859                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6860 0000DFD5 C705[E4490100]0002- <1> 	mov	dword [u.r0], 200h ; AH = major version, AL = minor version 
  6860 0000DFDD 0000                <1>
  6861 0000DFDF E9D6DDFFFF          <1> 	jmp	sysret
  6862                              <1> 
  6863                              <1> sysreserved1:
  6864                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  6865                              <1> 	; // name and content will be changed later //
  6866 0000DFE4 C705[E4490100]E007- <1> 	mov	dword [u.r0], 2016
  6866 0000DFEC 0000                <1>
  6867 0000DFEE E9C7DDFFFF          <1> 	jmp	sysret
  6868                              <1> 
  6869                              <1> syspri: ; change running priority (of the process)
  6870                              <1> 	; 21/05/2016
  6871                              <1> 	; 20/05/2026 - TRDOS 386 (TRDOS v2.0)
  6872                              <1> 	; INPUT ->
  6873                              <1> 	;	BL = priority level
  6874                              <1> 	;	   0 = low running priority (running on background)
  6875                              <1> 	;	   1 = normal/regular priority (running as regular)
  6876                              <1> 	;	   2 = high/event priority (running for event)
  6877                              <1> 	;	   >2 = invalid, it will accepted as 2 (event)
  6878                              <1> 	;	   0FFh = get/return current running priority only	
  6879                              <1> 	; OUTPUT -> 	
  6880                              <1> 	;	* if current [u.pri] < 2
  6881                              <1> 	;	  if BL input < 0FFh ->
  6882                              <1> 	;	     [u.pri] is updated as in BL input (0,1,2)
  6883                              <1> 	;	  if BL input = 0FFh -> AL = [u.pri] (current)
  6884                              <1> 	;	      
  6885                              <1> 	;	* if current [u.pri] = 2
  6886                              <1> 	;	  if BL input < 0FFh -> cf = 1 & AL = 2
  6887                              <1> 	;	  if BL input = 0FFh -> cf = 0 & AL = 2  
  6888                              <1> 	;	
  6889                              <1> 	;	NOTE: 	
  6890                              <1> 	;	If [u.pri] = 2, it can not be changed to 1 or 0;
  6891                              <1> 	;	because, run queue of the running process is unspecified
  6892                              <1> 	;	at this	stage. Process might be started by a timer event
  6893                              <1> 	;	or priority might be changed to high by previous
  6894                              <1> 	;	'syspri' system	call. In both cases, the process is in
  6895                              <1> 	;	'runq_normal' or 'runq_background' queue.
  6896                              <1> 	;	As result of this fact, when the [u.quant] time quantum
  6897                              <1> 	;	of the process is elapsed or 'sysrele' system call is
  6898                              <1> 	;	instructed by the process, 'tswap' ('tswitch') procedure
  6899                              <1> 	;	will be called (to 'swap' or 'switch' out the procedure)
  6900                              <1> 	;	and it will not call 'putlu' to add the (stopping)
  6901                              <1> 	;	process to relevant run queue when [u.pri] = 2.
  6902                              <1> 	;	(Otherwise, it would be possible to add process to
  6903                              <1> 	;	a run queue while it is already in a run queue, wrongly.)
  6904                              <1>   	;
  6905                              <1> 	;	If [u.pri]< 2, 'tswap/tswitch' procedure will call 
  6906                              <1> 	;	'putlu' to add process to relevant run queue
  6907                              <1> 	;	according to [u.pri] value. ('runq_normal' for 1, 
  6908                              <1> 	;	'runq_background' for 0).
  6909                              <1> 	;
  6910                              <1> 	;	If BL input >= 2 and < 0FFh while [u.pri] < 2,
  6911                              <1> 	;	process will be added to 'runq_normal' queue and
  6912                              <1> 	;	[u.pri] will be set to 2. (in 'syspri' system call)
  6913                              <1> 	;
  6914                              <1> 
  6915 0000DFF3 29C0                <1> 	sub	eax, eax ; 0
  6916 0000DFF5 A3[484A0100]        <1> 	mov	[u.error], eax
  6917                              <1> 
  6918 0000DFFA A0[294A0100]        <1> 	mov	al, [u.pri]
  6919 0000DFFF A3[E4490100]        <1> 	mov	[u.r0], eax
  6920                              <1> 
  6921 0000E004 FEC3                <1> 	inc	bl
  6922 0000E006 0F84AEDDFFFF        <1> 	jz	sysret ; 0FFh -> 0, get priority level
  6923                              <1> 	
  6924 0000E00C 3C02                <1> 	cmp	al, 2
  6925 0000E00E 0F8386DDFFFF        <1> 	jnb	error ; CF = 1 & AL = 2 (& last error = 0)
  6926                              <1> 
  6927 0000E014 FECB                <1> 	dec	bl
  6928 0000E016 80FB02              <1> 	cmp	bl, 2
  6929 0000E019 7602                <1> 	jna	short syspri_1
  6930 0000E01B B302                <1> 	mov	bl, 2
  6931                              <1> syspri_1:
  6932 0000E01D 881D[294A0100]      <1> 	mov	[u.pri], bl
  6933 0000E023 80FB02              <1> 	cmp	bl, 2
  6934 0000E026 0F828EDDFFFF        <1>         jb      sysret
  6935                              <1> 
  6936                              <1> 	; here...
  6937                              <1> 	; Priority of current process has been changed to high
  6938                              <1> 	; ('run for event') but current process will be added to
  6939                              <1> 	; 'run as normal' queue. ('run for event' high priority
  6940                              <1> 	; queue is under control of timer -& RTC- interrupt only!) 
  6941                              <1> 	;
  6942                              <1> 	; (Otherwise, process can fall into black hole!
  6943                              <1> 	; e.g. if it is not in waiting list and it has not got 
  6944                              <1> 	; a timer event and it is not in a run queue!
  6945                              <1> 	; Because, when [u.pri] is 2, 'tswap/tswitch' will not 
  6946                              <1> 	; add the stopping process to a run queue.)
  6947                              <1> 
  6948 0000E02C A0[334A0100]        <1> 	mov	al, [u.uno]
  6949 0000E031 BB[D4490100]        <1> 	mov	ebx, runq_normal ; normal priority !
  6950                              <1> 				 ; [u.pri] is set to high
  6951                              <1> 				 ; but 'runq_event' queue is set
  6952                              <1> 				 ; only by the kernel's timer
  6953                              <1> 				 ; event function (timer interrupt). 
  6954 0000E036 E87AFFFFFF          <1> 	call	putlu
  6955 0000E03B E97ADDFFFF          <1> 	jmp	sysret
  6956                              <1> 
  6957                              <1> cpass: ; / get next character from user area of core and put it in AL (r1)
  6958                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
  6959                              <1> 	; 19/05/2015 - 18/10/2015 (Retro UNIX 386 v1)
  6960                              <1> 	; 14/08/2013 - 20/09/2013 (Retro UNIX 8086 v1)
  6961                              <1> 	; INPUTS -> 
  6962                              <1> 	;     [u.base] = virtual address in user area
  6963                              <1> 	;     [u.count] = byte count (max.)
  6964                              <1> 	;     [u.pcount] = byte count in page (0 = reset)		
  6965                              <1> 	; OUTPUTS -> 
  6966                              <1> 	;     AL = the character which is pointed by [u.base]
  6967                              <1> 	;     zf = 1 -> transfer count has been completed	
  6968                              <1>         ;
  6969                              <1> 	; ((Modified registers:  EAX, EDX, ECX))
  6970                              <1> 	;
  6971 0000E040 833D[084A0100]00    <1> 	cmp 	dword [u.count], 0  ; have all the characters been transferred
  6972                              <1> 			    	    ; i.e., u.count, # of chars. left
  6973 0000E047 763F                <1> 	jna	short cpass_3	    ; to be transferred = 0?) yes, branch
  6974 0000E049 FF0D[084A0100]      <1> 	dec	dword [u.count]	    ; no, decrement u.count
  6975                              <1>         ; 19/05/2015 
  6976                              <1> 	;(Retro UNIX 386 v1 - translation from user's virtual address
  6977                              <1> 	;		      to physical address
  6978 0000E04F 66833D[444A0100]00  <1> 	cmp	word [u.pcount], 0 ; byte count in page = 0 (initial value)
  6979                              <1> 			     ; 1-4095 --> use previous physical base address
  6980                              <1> 			     ; in [u.pbase]
  6981 0000E057 770E                <1> 	ja	short cpass_1
  6982 0000E059 833D[3C4A0100]00    <1> 	cmp     dword [u.ppgdir], 0  ; is the caller os kernel
  6983 0000E060 7427                <1>         je      short cpass_k       ; (sysexec, '/etc/init') ?  (MainProg)
  6984 0000E062 E867FDFFFF          <1> 	call	trans_addr_r
  6985                              <1> cpass_1:
  6986 0000E067 66FF0D[444A0100]    <1> 	dec	word [u.pcount]
  6987                              <1> cpass_2: 
  6988 0000E06E 8B15[404A0100]      <1> 	mov	edx, [u.pbase]
  6989 0000E074 8A02                <1> 	mov	al, [edx]	; take the character pointed to 
  6990                              <1> 				; by u.base and put it in r1
  6991 0000E076 FF05[0C4A0100]      <1> 	inc	dword [u.nread] ; increment no. of bytes transferred
  6992 0000E07C FF05[044A0100]      <1> 	inc	dword [u.base]  ; increment the buffer address to point to the
  6993                              <1> 			        ; next byte
  6994 0000E082 FF05[404A0100]      <1> 	inc	dword [u.pbase]
  6995                              <1> cpass_3:
  6996 0000E088 C3                  <1> 	retn
  6997                              <1> cpass_k:
  6998                              <1> 	; 02/07/2015
  6999                              <1> 	; The caller is os kernel 
  7000                              <1> 	; (get sysexec arguments from kernel's memory space)
  7001 0000E089 8B1D[044A0100]      <1> 	mov	ebx, [u.base]
  7002 0000E08F 66C705[444A0100]00- <1>         mov     word [u.pcount], PAGE_SIZE ; 4096
  7002 0000E097 10                  <1>
  7003 0000E098 891D[404A0100]      <1> 	mov	[u.pbase], ebx
  7004 0000E09E EBCE                <1> 	jmp	short cpass_2
  7005                              <1> 
  7006                              <1> transfer_to_user_buffer: ; fast transfer
  7007                              <1> 	; 27/05/2016
  7008                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  7009                              <1> 	;
  7010                              <1> 	; INPUT ->
  7011                              <1> 	;	ESI = source address in system space
  7012                              <1> 	;	EDI = user's buffer address
  7013                              <1> 	;	ECX = transfer (byte) count
  7014                              <1> 	;	[u.pgdir] = user's page directory
  7015                              <1> 	; OUTPUT ->
  7016                              <1> 	;	ECX = actual transfer count
  7017                              <1> 	;	cf = 1 -> error
  7018                              <1> 	;	[u.count] = remain byte count
  7019                              <1> 	;
  7020                              <1> 	; Modified registers: eax, ecx
  7021                              <1> 	;
  7022                              <1> 
  7023 0000E0A0 21C9                <1> 	and	ecx, ecx
  7024 0000E0A2 743B                <1> 	jz	short ttub_4
  7025                              <1> 
  7026 0000E0A4 890D[084A0100]      <1> 	mov	[u.count], ecx
  7027                              <1> 	
  7028 0000E0AA 57                  <1> 	push	edi
  7029 0000E0AB 56                  <1> 	push	esi
  7030 0000E0AC 53                  <1> 	push	ebx
  7031 0000E0AD 52                  <1> 	push	edx
  7032 0000E0AE 51                  <1> 	push	ecx
  7033                              <1> 
  7034 0000E0AF 89FB                <1> 	mov	ebx, edi
  7035 0000E0B1 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
  7036                              <1> ttub_1:
  7037                              <1> 	; ebx = virtual (linear) address
  7038                              <1> 	; [u.pgdir] = user's page directory
  7039 0000E0B7 E8CD71FFFF          <1>        	call	get_physical_addr_x ; get physical address
  7040 0000E0BC 7222                <1> 	jc	short ttub_5
  7041                              <1> 	; eax = physical address 
  7042                              <1> 	; ecx = remain byte count in page (1-4096)
  7043 0000E0BE 89C7                <1> 	mov	edi, eax
  7044 0000E0C0 A1[084A0100]        <1> 	mov	eax, [u.count]
  7045 0000E0C5 39C1                <1> 	cmp	ecx, eax
  7046 0000E0C7 7602                <1> 	jna	short ttub_2
  7047 0000E0C9 89C1                <1> 	mov	ecx, eax
  7048                              <1> ttub_2:	
  7049 0000E0CB 29C8                <1> 	sub	eax, ecx
  7050 0000E0CD 01CB                <1> 	add	ebx, ecx
  7051 0000E0CF F3A4                <1> 	rep	movsb
  7052 0000E0D1 A3[084A0100]        <1> 	mov	[u.count], eax
  7053 0000E0D6 09C0                <1> 	or	eax, eax
  7054 0000E0D8 75DD                <1> 	jnz	short ttub_1
  7055                              <1> ttub_retn:
  7056                              <1> tfub_retn:
  7057 0000E0DA 59                  <1> 	pop	ecx ; transfer count = actual transfer count
  7058                              <1> ttub_3:
  7059 0000E0DB 5A                  <1> 	pop	edx
  7060 0000E0DC 5B                  <1> 	pop	ebx
  7061 0000E0DD 5E                  <1> 	pop	esi
  7062 0000E0DE 5F                  <1> 	pop	edi
  7063                              <1> ttub_4:
  7064 0000E0DF C3                  <1> 	retn
  7065                              <1> ttub_5:
  7066 0000E0E0 59                  <1> 	pop	ecx
  7067 0000E0E1 2B0D[084A0100]      <1> 	sub	ecx, [u.count] ; actual transfer count
  7068 0000E0E7 F9                  <1> 	stc
  7069 0000E0E8 EBF1                <1> 	jmp	short ttub_3
  7070                              <1> 
  7071                              <1> transfer_from_user_buffer: ; fast transfer
  7072                              <1> 	; 27/05/2016
  7073                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  7074                              <1> 	;
  7075                              <1> 	; INPUT ->
  7076                              <1> 	;	ESI = user's buffer address
  7077                              <1> 	;	EDI = destination address in system space
  7078                              <1> 	;	ECX = transfer (byte) count
  7079                              <1> 	;	[u.pgdir] = user's page directory
  7080                              <1> 	; OUTPUT ->
  7081                              <1> 	;	ecx = actual transfer count
  7082                              <1> 	;	cf = 1 -> error
  7083                              <1> 	;	[u.count] = remain byte count
  7084                              <1> 	;
  7085                              <1> 	; Modified registers: eax, ecx
  7086                              <1> 	;
  7087                              <1> 
  7088 0000E0EA 21C9                <1> 	and	ecx, ecx
  7089                              <1> 	;jz	short tfub_4
  7090 0000E0EC 74F1                <1> 	jz	short ttub_4
  7091                              <1> 
  7092 0000E0EE 890D[084A0100]      <1> 	mov	[u.count], ecx
  7093                              <1> 	
  7094 0000E0F4 57                  <1> 	push	edi
  7095 0000E0F5 56                  <1> 	push	esi
  7096 0000E0F6 53                  <1> 	push	ebx
  7097 0000E0F7 52                  <1> 	push	edx
  7098 0000E0F8 51                  <1> 	push	ecx
  7099                              <1> 
  7100 0000E0F9 89F3                <1> 	mov	ebx, esi
  7101 0000E0FB 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
  7102                              <1> tfub_1:
  7103                              <1> 	; ebx = virtual (linear) address
  7104                              <1> 	; [u.pgdir] = user's page directory
  7105 0000E101 E88371FFFF          <1>        	call	get_physical_addr_x ; get physical address
  7106                              <1> 	;jc	short tfub_5
  7107 0000E106 72D8                <1> 	jc	short ttub_5
  7108                              <1> 	; eax = physical address 
  7109                              <1> 	; ecx = remain byte count in page (1-4096)
  7110 0000E108 89C6                <1> 	mov	esi, eax
  7111 0000E10A A1[084A0100]        <1> 	mov	eax, [u.count]
  7112 0000E10F 39C1                <1> 	cmp	ecx, eax
  7113 0000E111 7602                <1> 	jna	short tfub_2
  7114 0000E113 89C1                <1> 	mov	ecx, eax
  7115                              <1> tfub_2:	
  7116 0000E115 29C8                <1> 	sub	eax, ecx
  7117 0000E117 01CB                <1> 	add	ebx, ecx
  7118 0000E119 F3A4                <1> 	rep	movsb
  7119 0000E11B A3[084A0100]        <1> 	mov	[u.count], eax
  7120 0000E120 09C0                <1> 	or	eax, eax
  7121 0000E122 75DD                <1> 	jnz	short tfub_1
  7122                              <1> 
  7123 0000E124 EBB4                <1> 	jmp	short tfub_retn
  7124                              <1> 
  7125                              <1> ;tfub_retn:
  7126                              <1> ;	pop	ecx ; transfer count = actual transfer count
  7127                              <1> ;tfub_3:
  7128                              <1> ;	pop	edx
  7129                              <1> ;	pop	ebx
  7130                              <1> ;	pop	esi
  7131                              <1> ;	pop	edi
  7132                              <1> ;tfub_4:
  7133                              <1> ;	retn
  7134                              <1> ;tfub_5:
  7135                              <1> ;	pop	ecx
  7136                              <1> ;	sub	ecx, [u.count] ; actual transfer count
  7137                              <1> ;	stc
  7138                              <1> ;	jmp	short tfub_3
  7139                              <1> 
  7140                              <1> sysfff: ; <Find First File>
  7141                              <1> 	; 17/10/2016
  7142                              <1> 	; 16/10/2016
  7143                              <1> 	; 15/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
  7144                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
  7145                              <1> 	;            ("loc_INT21h_find_first_file")
  7146                              <1> 	; TRDOS 8086 (v1.0)
  7147                              <1>         ; 	07/08/2011 
  7148                              <1>         ;	Find First File
  7149                              <1> 	;	INPUT:
  7150                              <1>         ;	    CX= Attributes
  7151                              <1>         ;	    DS:DX= Pointer to filename
  7152                              <1> 	;	MSDOS OUTPUT:
  7153                              <1> 	;	    DTA: (Default address: PSP offset 80h)
  7154                              <1> 	;	    Offset  Descrription
  7155                              <1> 	;	    0	    Reserved for use find next file
  7156                              <1> 	;	    21	    Attribute of file found
  7157                              <1> 	;	    22	    Time stamp of file
  7158                              <1> 	;	    24	    Date stamp of file
  7159                              <1> 	;	    26	    File size in bytes
  7160                              <1> 	;	    30	    Filename and extension (zero terminated)
  7161                              <1> 	;	If cf = 1:
  7162                              <1> 	;	    Error Codes: (in AX)
  7163                              <1> 	;	    	2 - File not found
  7164                              <1> 	;	       18 - No more files  			
  7165                              <1>         ;
  7166                              <1> 	; TRDOS 386 (v2.0) 
  7167                              <1> 	; 15/10/2016
  7168                              <1> 	;	
  7169                              <1>         ; INPUT ->
  7170                              <1>         ;	   CL = File attributes
  7171                              <1> 	;     	      bit 0 (1) - Read only file (R)
  7172                              <1> 	;             bit 1 (1) - Hidden file (H)
  7173                              <1>         ;             bit 2 (1) - System file (R)
  7174                              <1> 	;             bit 3 (1) - Volume label/name (V)
  7175                              <1>         ;             bit 4 (1) - Subdirectory (D)
  7176                              <1> 	;	      bit 5 (1) - File has been archived (A)
  7177                              <1> 	;	   CH = 0 -> Return basic parameters (24 bytes)
  7178                              <1> 	;	   CH > 0 -> Return FindFile structure/table (128 bytes)
  7179                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
  7180                              <1> 	;	   EDX = File parameters buffer address
  7181                              <1> 	;		(buffer size = 24 bytes if CH input = 0)
  7182                              <1> 	;		(buffer size = 128 bytes if CH input > 0)
  7183                              <1> 	;		 
  7184                              <1> 	; OUTPUT ->
  7185                              <1> 	;	   EAX = 0 if CH input > 0
  7186                              <1> 	;	   EAX = First cluster number of file if CH input = 0	
  7187                              <1> 	;	   EDX = File parameters table/structure address
  7188                              <1> 	;	   Basic Parameters:
  7189                              <1> 	;		Offset  Description
  7190                              <1> 	;		------	---------------
  7191                              <1> 	;		0	File Attributes
  7192                              <1> 	;		1	Ambiguous filename chars are used sign
  7193                              <1> 	;			(0 = filename fits exactly with request)
  7194                              <1> 	;			(>0 = ambiguous filename chars are used)
  7195                              <1> 	;	      	2	Time stamp of file
  7196                              <1> 	;		4	Date stamp of file
  7197                              <1> 	;		6	File size in bytes
  7198                              <1> 	;		10	Short Filename (ASCIIZ, max. 13 bytes)
  7199                              <1> 	;		23	Longname Length (1-255) if existing 
  7200                              <1> 	;  
  7201                              <1> 	;          cf = 1 -> Error code in AL
  7202                              <1> 	;
  7203                              <1> 	; Modified Registers: EAX (at the return of system call)
  7204                              <1> 	;  
  7205                              <1> 	; TR-DOS FindFile (FFF) Structure (128 bytes):
  7206                              <1> 	; 09/10/2011 (DIR.ASM) - 10/02/2016 (trdoskx.s)
  7207                              <1> 	;	
  7208                              <1> 	; Offset	Parameter		Size
  7209                              <1> 	; ------	------------------	-------- 
  7210                              <1> 	; 0		FindFile_Drv		1 byte
  7211                              <1> 	; 1		FindFile_Directory	65 bytes
  7212                              <1> 	; 66		FindFile_Name		13 bytes
  7213                              <1> 	; 79		FindFile_LongNameEntryLength 1 byte
  7214                              <1> 	;Above 80 bytes form
  7215                              <1> 	;TR-DOS Source/Destination File FullName Format/Structure
  7216                              <1> 	; 80		FindFile_AttributesMask 1 word
  7217                              <1> 	; 82		FindFile_DirEntry	32 bytes (*)
  7218                              <1> 	; 114		FindFile_DirFirstCluster 1 double word
  7219                              <1> 	; 118		FindFile_DirCluster	1 double word
  7220                              <1> 	; 122		FindFile_DirEntryNumber 1 word
  7221                              <1> 	; 124		FindFile_MatchCounter	1 word
  7222                              <1> 	; 126		FindFile_Reserved	1 word
  7223                              <1>    	; (*) MS-DOS, FAT 12-16-32 classic directory entry (32 bytes)
  7224                              <1> 
  7225                              <1> 	;mov	[u.namep], ebx
  7226                              <1> 	; 16/10/2016
  7227 0000E126 8915[5C410100]      <1> 	mov	[FFF_UBuffer], edx
  7228 0000E12C 66890D[61410100]    <1> 	mov	[FFF_Attrib], cx ; [FFF_RType] = ch
  7229                              <1> 		    ; Attributes in CL, return data type in CH
  7230 0000E133 89DE                <1> 	mov	esi, ebx
  7231                              <1> 	; file name is forced, change directory as temporary
  7232                              <1> 	;mov	ax, 1
  7233                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  7234                              <1> 	;call	set_working_path 
  7235 0000E135 E8440C0000          <1> 	call	set_working_path_x ; 17/10/2016	
  7236 0000E13A 731D                <1> 	jnc	short sysfff_0
  7237                              <1>  
  7238 0000E13C 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  7239 0000E13E 7505                <1> 	jnz	short sysfff_err
  7240                              <1> 
  7241                              <1> 	; eax = 0
  7242 0000E140 B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  7243                              <1> sysfff_err:
  7244 0000E145 A3[E4490100]        <1> 	mov	[u.r0], eax
  7245 0000E14A A3[484A0100]        <1> 	mov	[u.error], eax
  7246 0000E14F E8FF0C0000          <1>         call 	reset_working_path
  7247 0000E154 E941DCFFFF          <1> 	jmp	error
  7248                              <1> 
  7249                              <1> sysfff_0:
  7250                              <1> 	;sub	ah, ah ; ah = 0
  7251 0000E159 8A0424              <1> 	mov	al, [esp]
  7252 0000E15C 08C0                <1> 	or	al, al
  7253 0000E15E 7412                <1> 	jz	short sysfff_2
  7254 0000E160 B410                <1> 	mov	ah, 10h
  7255 0000E162 A808                <1> 	test	al, 08h
  7256 0000E164 7503                <1> 	jnz	short sysfff_1
  7257 0000E166 80CC08              <1> 	or	ah, 08h
  7258                              <1> sysfff_1:
  7259 0000E169 2410                <1> 	and	al, 10h ; Directory
  7260 0000E16B 7405                <1> 	jz	short sysfff_2
  7261 0000E16D 80E408              <1> 	and	ah, 08h
  7262 0000E170 30C0                <1> 	xor	al, al ; When a directory is searched,
  7263                              <1> 		       ; filename will be returned even if
  7264                              <1> 		       ; it is not a directory!
  7265                              <1> 		       ; Because: (in order to prevent
  7266                              <1> 		       ; creating a dir with existing file name)
  7267                              <1> 		       ; Dir and file names must not be same!
  7268                              <1> 		       ; (return attribute must be checked)  	  	 	
  7269                              <1> sysfff_2:
  7270                              <1> 	; AX = Attributes mask 
  7271                              <1> 		; AL = AND mask (result must be equal to AL)
  7272                              <1> 		; AH = Negative AND mask (result must be ZERO)			
  7273                              <1>  	; ESI = FindFile_Name address
  7274                              <1> 
  7275 0000E172 E88C97FFFF          <1> 	call	find_first_file
  7276 0000E177 72CC                <1> 	jc	short sysfff_err ; eax = 2 (File not found !)
  7277                              <1> 
  7278                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  7279                              <1> 	; EDI = Directory Buffer Directory Entry Location
  7280                              <1> 	; EAX = File Size
  7281                              <1> 	;  BL = Attributes of The File/Directory
  7282                              <1> 	;  BH = Long Name Yes/No Status (>0 is YES)
  7283                              <1> 	;  DX > 0 : Ambiguous filename chars are used
  7284                              <1> 
  7285                              <1> sysfff_3:
  7286                              <1> 	; 16/10/2016
  7287 0000E179 668B0D[61410100]    <1> 	mov	cx, [FFF_Attrib]
  7288                              <1> 	; Attribs in CL, return data type in CH
  7289                              <1> 
  7290                              <1> 	;or	cl, cl
  7291                              <1> 	;jz	short sysfff_4 ; 0 = No filter
  7292 0000E180 80F1FF              <1> 	xor	cl, 0FFh
  7293 0000E183 20D9                <1> 	and	cl, bl
  7294 0000E185 7409                <1> 	jz	short sysfff_4
  7295                              <1> 
  7296                              <1> 	;mov	eax, 2 ; 'file not found !' error
  7297                              <1> 	;jmp	short sysfff_err_1
  7298                              <1> 
  7299                              <1> 	; 16/10/2016
  7300 0000E187 E82698FFFF          <1> 	call	find_next_file
  7301 0000E18C 72B7                <1> 	jc	short sysfff_err ; eax = 12 (no more files !)
  7302 0000E18E EBE9                <1> 	jmp	short sysfff_3
  7303                              <1> 
  7304                              <1> sysfff_4:
  7305 0000E190 20ED                <1> 	and	ch, ch ; [FFF_RType]
  7306 0000E192 7412                <1> 	jz	short sysfff_5
  7307 0000E194 B980000000          <1> 	mov	ecx, 128 ; ; transfer length
  7308 0000E199 880D[60410100]      <1> 	mov	[FFF_Valid], cl
  7309                              <1> sysfnf_11:
  7310 0000E19F BE[123E0100]        <1> 	mov	esi, FindFile_Drv
  7311 0000E1A4 EB44                <1> 	jmp	short sysfff_6	
  7312                              <1> sysfff_5:
  7313                              <1> 	;mov	esi, FindFile_DirEntry
  7314 0000E1A6 B918000000          <1> 	mov	ecx, 24  ; transfer length
  7315 0000E1AB 880D[60410100]      <1> 	mov	[FFF_Valid], cl
  7316                              <1> sysfnf_12:
  7317 0000E1B1 BF[1C460100]        <1> 	mov	edi, DTA ; FFF data transfer address
  7318                              <1> 	;mov	al, [esi+DirEntry_Attr] ; 11
  7319 0000E1B6 88D8                <1> 	mov	al, bl ; File/Dir Attributes
  7320 0000E1B8 887F17              <1> 	mov	[edi+23], bh ; Longname length (0= none)
  7321 0000E1BB AA                  <1> 	stosb
  7322 0000E1BC 88D0                <1> 	mov	al, dl ; DL is for '?'
  7323 0000E1BE 00F0                <1> 	add	al, dh ; DH is for '*'
  7324                              <1> 	; AL > 0 if ambiguous file name wildcards are used
  7325 0000E1C0 AA                  <1> 	stosb
  7326 0000E1C1 8B4616              <1> 	mov	eax, [esi+DirEntry_WrtTime] ; 22	
  7327 0000E1C4 AB                  <1>         stosd	; DirEntry_WrtTime & DirEntry_WrtDate
  7328 0000E1C5 8B461C              <1>         mov	eax, [esi+DirEntry_FileSize] ; 28
  7329 0000E1C8 AB                  <1>         stosd
  7330 0000E1C9 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
  7331 0000E1CD 66C1E010            <1> 	shl	ax, 16
  7332 0000E1D1 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
  7333 0000E1D5 A3[E4490100]        <1> 	mov	[u.r0], eax ; First Cluster
  7334                              <1> 
  7335                              <1>         ;mov	esi, FindFile_DirEntry
  7336 0000E1DA E8B10C0000          <1> 	call	get_file_name
  7337                              <1> 
  7338 0000E1DF 8A0D[60410100]      <1> 	mov	cl, [FFF_Valid]
  7339 0000E1E5 BE[1C460100]        <1>        	mov	esi, DTA ; FFF data transfer address
  7340                              <1> sysfff_6:
  7341 0000E1EA 8B3D[5C410100]      <1> 	mov	edi, [FFF_UBuffer] ; user's buffer address (edx)
  7342 0000E1F0 E8ABFEFFFF          <1> 	call	transfer_to_user_buffer
  7343                              <1> 
  7344 0000E1F5 890D[E4490100]      <1> 	mov	[u.r0], ecx ; actual transfer count
  7345 0000E1FB E8530C0000          <1>         call 	reset_working_path
  7346 0000E200 E9B5DBFFFF          <1> 	jmp	sysret
  7347                              <1> 
  7348                              <1> sysfnf: ; <Find Next File>
  7349                              <1> 	; 16/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
  7350                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
  7351                              <1> 	;            ("loc_INT21h_find_next_file")
  7352                              <1> 	; TRDOS 8086 (v1.0)
  7353                              <1>         ; 	07/08/2011 
  7354                              <1>         ;	Find First File
  7355                              <1> 	;	INPUT:
  7356                              <1>         ;	    none
  7357                              <1> 	;	MSDOS OUTPUT:
  7358                              <1> 	;	    DTA: (Default address: PSP offset 80h)
  7359                              <1> 	;	    Offset  Descrription
  7360                              <1> 	;	    0	    Reserved for use find next file
  7361                              <1> 	;	    21	    Attribute of file found
  7362                              <1> 	;	    22	    Time stamp of file
  7363                              <1> 	;	    24	    Date stamp of file
  7364                              <1> 	;	    26	    File size in bytes
  7365                              <1> 	;	    30	    Filename and extension (zero terminated)
  7366                              <1> 	;	If cf = 1:
  7367                              <1> 	;	    Error Codes: (in AX)
  7368                              <1> 	;	       18 - No more files  			
  7369                              <1>         ;
  7370                              <1> 	; TRDOS 386 (v2.0) 
  7371                              <1> 	; 16/10/2016
  7372                              <1> 	;	
  7373                              <1>         ; INPUT ->
  7374                              <1>        	; 	   none
  7375                              <1> 	; OUTPUT ->
  7376                              <1> 	;	   EAX = 0 if CH input of 'Find First File' > 0
  7377                              <1> 	;	   EAX = First cluster number of file
  7378                              <1> 	;		 if CH input of 'Find First File' = 0	
  7379                              <1> 	;	   EDX = File parameters table/structure address
  7380                              <1> 	;
  7381                              <1> 	;          cf = 1 -> Error code in AL
  7382                              <1> 	;
  7383                              <1>  	; Modified Registers: EAX (at the return of system call)	
  7384                              <1> 
  7385                              <1> 	;	
  7386                              <1> 	; Note: If byte [FFF_Valid] = 0
  7387                              <1> 	;	'sysfnf' will return with 'no more files' error.
  7388                              <1> 	;	If byte [FFF_Valid] = 24
  7389                              <1> 	;	'sysfnf' will return with 32 bytes basic parameters
  7390                              <1> 	;	at the address which is in EDX.
  7391                              <1> 	;	If byte [FFF_Valid] = 128
  7392                              <1> 	;	'sysfnf' will return with 128 bytes Find File 
  7393                              <1> 	;	Structure/Table at the address which is in EDX.
  7394                              <1> 	
  7395 0000E205 803D[60410100]00    <1> 	cmp	byte [FFF_Valid], 0
  7396 0000E20C 7714                <1> 	ja	short stsfnf_0
  7397                              <1>  	; 'no more files !' error 
  7398 0000E20E B80C000000          <1> 	mov	eax, ERR_NO_MORE_FILES ; 12
  7399 0000E213 A3[E4490100]        <1> 	mov	[u.r0], eax
  7400 0000E218 A3[484A0100]        <1> 	mov	[u.error], eax
  7401 0000E21D E978DBFFFF          <1> 	jmp	error
  7402                              <1> stsfnf_0:
  7403                              <1> 	;cmp	byte [FFF_Valid], 128
  7404                              <1> 	;je	short stsfnf_1
  7405                              <1> 	;cmp	byte [FFF_Valid], 24
  7406                              <1> 	;je	short stsfnf_1
  7407                              <1> 	;mov	[FFF_Valid], 24 ; Default
  7408                              <1> stsfnf_1:
  7409 0000E222 0FB61D[6E340100]    <1> 	movzx	ebx, byte [Current_Drv]
  7410 0000E229 66891D[66410100]    <1> 	mov	[SWP_DRV], bx
  7411 0000E230 8A15[123E0100]      <1> 	mov	dl, [FindFile_Drv]
  7412 0000E236 38DA                <1> 	cmp	dl, bl
  7413 0000E238 750B                <1> 	jne	short stsfnf_2
  7414 0000E23A 86FB                <1> 	xchg	bh, bl
  7415 0000E23C BE00010900          <1> 	mov	esi, Logical_DOSDisks
  7416 0000E241 01DE                <1> 	add	esi, ebx
  7417 0000E243 EB0D                <1> 	jmp	short sysfnf_3
  7418                              <1> 
  7419                              <1> stsfnf_2:
  7420 0000E245 FE05[67410100]      <1> 	inc	byte [SWP_DRV_chg]
  7421                              <1> 
  7422 0000E24B E82183FFFF          <1> 	call	change_current_drive
  7423 0000E250 7245                <1> 	jc	short sysfnf_err_1 ; read error ! 
  7424                              <1> 				   ; (do not stop, because
  7425                              <1> 				   ; we don't have a
  7426                              <1> 				   ; 'no more files'
  7427                              <1> 				   ; -file not found- error,	
  7428                              <1> 				   ; next sysfnf system call
  7429                              <1> 				   ; may solve the problem,
  7430                              <1> 				   ; after re-placing the disk)				
  7431                              <1> sysfnf_3:
  7432 0000E252 A1[883E0100]        <1> 	mov	eax, [FindFile_DirCluster]
  7433 0000E257 21C0                <1> 	and	eax, eax
  7434 0000E259 7550                <1> 	jnz	short sysfnf_6
  7435                              <1>         
  7436 0000E25B 803D[6D340100]02    <1> 	cmp	byte [Current_FATType], 2
  7437 0000E262 772C                <1> 	ja	short sysfnf_err_0 ; invalid, we neeed to stop !?
  7438 0000E264 803D[6D340100]01    <1> 	cmp	byte [Current_FATType], 1
  7439 0000E26B 7223                <1> 	jb	short sysfnf_err_0 ; invalid, we neeed to stop !?
  7440                              <1> 
  7441 0000E26D 3805[983C0100]      <1> 	cmp	byte [DirBuff_ValidData], al ; 0
  7442 0000E273 7608                <1> 	jna	short sysfnf_4 
  7443                              <1> 
  7444 0000E275 3B05[9D3C0100]      <1> 	cmp	eax, [DirBuff_Cluster] ; 0 ?
  7445 0000E27B 745E                <1> 	je	short sysfnf_9
  7446                              <1> 
  7447                              <1> 	;cmp	byte [Current_Dir_Level], 0
  7448                              <1>         ;ja	short sysfnf_4  
  7449                              <1>         ;jna	short sysfnf_9 
  7450                              <1> 
  7451                              <1> sysfnf_4:
  7452 0000E27D FE05[67410100]      <1> 	inc	byte [SWP_DRV_chg]
  7453 0000E283 E804D1FFFF          <1> 	call 	load_FAT_root_directory
  7454 0000E288 7351                <1> 	jnc	short sysfnf_9
  7455                              <1> 	; eax = error code (17, 'drv not ready or read error')
  7456 0000E28A EB0B                <1> 	jmp	short sysfnf_err_1 ; read error ! (no FNF stop)
  7457                              <1> 				   ; (if you want, try again, 
  7458                              <1> 				   ;  after re-placing the disk)
  7459                              <1> sysfnf_5:	
  7460 0000E28C 3C0C                <1> 	cmp	al, 12 ; 'no more files' error
  7461 0000E28E 7507                <1> 	jne	short sysfnf_err_1 ; (no FNF stop -sysfnf will try
  7462                              <1> 				   ;  to read the directory again,
  7463                              <1> 				   ;  if the user calls sysfnf
  7464                              <1> 				   ;  just after this error return-)
  7465                              <1> 	; (FNF stop -sysfnf will not try
  7466                              <1> 	;  to read the directory again-)	
  7467                              <1> 
  7468                              <1> sysfnf_err_0:
  7469 0000E290 C605[60410100]00    <1> 	mov	byte [FFF_Valid], 0 ; FNF stop sign
  7470                              <1> sysfnf_err_1:
  7471 0000E297 A3[E4490100]        <1> 	mov	[u.r0], eax
  7472 0000E29C A3[484A0100]        <1> 	mov	[u.error], eax
  7473 0000E2A1 E8AD0B0000          <1> 	call	reset_working_path
  7474 0000E2A6 E9EFDAFFFF          <1> 	jmp	error
  7475                              <1> 	  
  7476                              <1> sysfnf_6:
  7477 0000E2AB 803D[983C0100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
  7478 0000E2B2 7608                <1> 	jna	short sysfnf_7
  7479                              <1> 
  7480 0000E2B4 3B05[9D3C0100]      <1> 	cmp	eax, [DirBuff_Cluster]
  7481 0000E2BA 741F                <1> 	je	short sysfnf_9
  7482                              <1> 
  7483                              <1> sysfnf_7:
  7484 0000E2BC FE05[67410100]      <1> 	inc	byte [SWP_DRV_chg]
  7485 0000E2C2 803D[6D340100]01    <1> 	cmp	byte [Current_FATType], 1
  7486 0000E2C9 7309                <1> 	jnb	short sysfnf_8
  7487                              <1> 
  7488                              <1> 	; Singlix (TRFS) File System 
  7489                              <1> 	; (access via compatibility buffer)
  7490 0000E2CB E884D1FFFF          <1> 	call	load_FS_sub_directory
  7491 0000E2D0 7309                <1> 	jnc	short sysfnf_9
  7492                              <1> 
  7493 0000E2D2 EBC3                <1> 	jmp	short sysfnf_err_1 ; read error (no FNF stop)
  7494                              <1> 
  7495                              <1> sysfnf_8:
  7496 0000E2D4 E83ED1FFFF          <1> 	call	load_FAT_sub_directory	 
  7497 0000E2D9 72BC                <1> 	jc	short sysfnf_err_1 ; read error (no FNF stop)
  7498                              <1> 
  7499                              <1> sysfnf_9:
  7500 0000E2DB E8D296FFFF          <1> 	call	find_next_file
  7501 0000E2E0 72AA                <1> 	jc	short sysfnf_5
  7502                              <1> 
  7503 0000E2E2 A0[61410100]        <1> 	mov	al, [FFF_Attrib]
  7504                              <1> 	;or	al, al
  7505                              <1> 	;jz	short sysfnf_10 ; 0 = No filter
  7506 0000E2E7 34FF                <1> 	xor	al, 0FFh
  7507 0000E2E9 20D8                <1> 	and	al, bl
  7508 0000E2EB 75EE                <1> 	jnz	short sysfnf_9 ; search for next file until
  7509                              <1> 			       ; an error return from
  7510                              <1> 			       ; find_next_file procedure	
  7511                              <1> sysfnf_10:
  7512 0000E2ED 0FB60D[60410100]    <1>         movzx	ecx, byte [FFF_Valid]
  7513 0000E2F4 80F980              <1> 	cmp	cl, 128 ; complete FindFile structure/table 
  7514 0000E2F7 0F84A2FEFFFF        <1> 	je	sysfnf_11
  7515                              <1> 	;cmp	cl, 24  ; basic parameters
  7516                              <1> 	;je	sysfnf_12       
  7517 0000E2FD E9AFFEFFFF          <1> 	jmp	sysfnf_12
  7518                              <1> 
  7519                              <1> writei:
  7520                              <1> 	; 26/10/2016
  7521                              <1> 	; 25/10/2016
  7522                              <1> 	; 23/10/2016
  7523                              <1> 	; 22/10/2016
  7524                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
  7525                              <1> 	; 19/05/2015 - 20/05/2015 (Retro UNIX 386 v1)
  7526                              <1> 	; 12/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  7527                              <1> 	;
  7528                              <1> 	; Write data to file with first cluster number in EAX
  7529                              <1> 	; 
  7530                              <1> 	; INPUTS ->
  7531                              <1> 	;    EAX - First cluster number of the file
  7532                              <1> 	;    EBX - File number (Open file index number)
  7533                              <1> 	;    u.count - byte count to be written
  7534                              <1> 	;    u.base - points to user buffer
  7535                              <1> 	;    u.fofp - points to dword with current file offset
  7536                              <1> 	;    i.size - file size
  7537                              <1> 	;    cdev - logical dos drive number of the file
  7538                              <1> 	; OUTPUTS ->
  7539                              <1> 	;    u.count - cleared
  7540                              <1> 	;    u.nread - accumulates total bytes passed back
  7541                              <1> 	;    i.size - new file size (if file byte offset overs file size)
  7542                              <1> 	;    u.fofp - points to u.off (with new offset value)	
  7543                              <1> 	;
  7544                              <1> 	; (Retro UNIX Prototype : 11/11/2012 - 18/11/2012, UNIXCOPY.ASM)
  7545                              <1> 	; ((Modified registers: eax, edx, ebx, ecx, esi, edi, ebp)) 	
  7546                              <1> 
  7547 0000E302 31C9                <1> 	xor	ecx, ecx
  7548 0000E304 890D[0C4A0100]      <1> 	mov 	[u.nread], ecx  ; 0
  7549 0000E30A 66890D[444A0100]    <1> 	mov	[u.pcount], cx ; 19/05/2015
  7550 0000E311 390D[084A0100]      <1> 	cmp 	[u.count], ecx
  7551 0000E317 7701                <1> 	ja 	short writei_1 
  7552 0000E319 C3                  <1> 	retn
  7553                              <1> writei_1:
  7554 0000E31A 881D[20410100]      <1> 	mov	[writei.ofn], bl ; Open file number
  7555 0000E320 880D[5B410100]      <1> 	mov	[setfmod], cl ; 0 ; reset 'update lm date&time' sign
  7556                              <1> dskw_0: 
  7557                              <1> 	; 26/10/2016
  7558                              <1> 	; 22/10/2016, 23/10/2016, 25/10/2016
  7559                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
  7560                              <1> 	; 31/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
  7561                              <1> 	; 26/04/2013 - 20/09/2013 (Retro UNIX 8086 v1)
  7562                              <1> 	;
  7563                              <1> 	; 01/08/2013 (mkdir_w check)
  7564 0000E326 E8D7000000          <1>  	call	mget_w
  7565                              <1> 	; eax = sector/block number
  7566                              <1> 
  7567 0000E32B 8B1D[F4490100]      <1> 	mov     ebx, [u.fofp]
  7568 0000E331 8B13                <1> 	mov	edx, [ebx]
  7569 0000E333 81E2FF010000        <1> 	and	edx, 1FFh  ; / test the lower 9 bits of the file offset
  7570 0000E339 750C                <1> 	jnz	short dskw_1 ; / if its non-zero, branch
  7571                              <1> 			     ; if zero, file offset = 0,
  7572                              <1> 		       	     ; / 512, 1024,...(i.e., start of new block)
  7573 0000E33B 813D[084A0100]0002- <1> 	cmp	dword [u.count], 512
  7573 0000E343 0000                <1>
  7574                              <1> 				; / if zero, is there enough data to fill
  7575                              <1> 				; / an entire block? (i.e., no. of
  7576 0000E345 7337                <1> 	jnb	short dskw_2 ; / bytes to be written greater than 512.? 
  7577                              <1> 			     ; / Yes, branch. Don't have to read block
  7578                              <1> dskw_1: ; in as no past info. is to be saved 
  7579                              <1> 	; (the entire block will be overwritten).
  7580                              <1> 	; 23/10/2016
  7581                              <1> 
  7582 0000E347 BB[B04D0100]        <1> 	mov	ebx, writei_buffer
  7583                              <1> 	; esi = logical dos drive description table address
  7584                              <1> 	; eax = sector number
  7585                              <1> 	; ebx = buffer address (in kernel's memory space)
  7586                              <1> 	; ecx = sector count
  7587 0000E34C B901000000          <1> 	mov	ecx, 1
  7588 0000E351 E823060000          <1> 	call	disk_read
  7589                              <1> 	;call	dskrd 	; / no, must retain old info.. 
  7590                              <1> 		       	; / Hence, read block 'r1' into an I/O buffer
  7591 0000E356 7326                <1> 	jnc	short dskw_2
  7592                              <1> 
  7593                              <1> 	; disk read error
  7594 0000E358 B811000000          <1> 	mov	eax, 17 ; drive not ready or READ ERROR !
  7595                              <1> dskw_err: ; jump from disk write error
  7596 0000E35D A3[E4490100]        <1> 	mov	[u.r0], eax
  7597 0000E362 A3[484A0100]        <1> 	mov	[u.error], eax
  7598                              <1> 
  7599 0000E367 803D[5B410100]00    <1> 	cmp	byte [setfmod], 0
  7600 0000E36E 0F8626DAFFFF        <1> 	jna	error
  7601                              <1> 
  7602 0000E374 E8AF030000          <1> 	call	update_file_lmdt ; update last modif. date&time of the file
  7603                              <1> 	;mov	byte [setfmod], 0	
  7604                              <1> 
  7605 0000E379 E91CDAFFFF          <1> 	jmp	error
  7606                              <1> 
  7607                              <1> dskw_2: ; 3:
  7608                              <1> 	; 23/10/2016
  7609 0000E37E C605[FC400100]01    <1> 	mov	byte [writei.valid], 1 ; writei buffer contains valid data
  7610 0000E385 56                  <1> 	push	esi ; logical dos drive description table address
  7611                              <1> 	; EAX (r1) = block/sector number
  7612                              <1> 	;call	wslot
  7613                              <1> 		; jsr r0,wslot / set write and inhibit bits in I/O queue, 
  7614                              <1> 			   ; / proc. status=0, r5 points to 1st word of data
  7615 0000E386 803D[464A0100]00    <1> 	cmp	byte [u.kcall], 0
  7616 0000E38D 770F                <1> 	ja	short dskw_4 ; zf=0 -> the caller is 'mkdir'
  7617                              <1> 	;
  7618 0000E38F 66833D[444A0100]00  <1> 	cmp	word [u.pcount], 0
  7619 0000E397 7705                <1> 	ja	short dskw_4
  7620                              <1> dskw_3:
  7621                              <1> 	; [u.base] = virtual address to transfer (as source address)
  7622 0000E399 E830FAFFFF          <1> 	call	trans_addr_r ; translate virtual address to physical (r)
  7623                              <1> dskw_4:
  7624 0000E39E BB[B04D0100]        <1> 	mov	ebx, writei_buffer
  7625                              <1> 	; EBX (r5) = system (I/O) buffer address
  7626 0000E3A3 E892FAFFFF          <1> 	call	sioreg
  7627                              <1> 	; ESI = file (user data) offset
  7628                              <1> 	; EDI = sector (I/O) buffer offset
  7629                              <1> 	; ECX = byte count
  7630                              <1> 	;
  7631 0000E3A8 F3A4                <1>   	rep	movsb
  7632                              <1> 	; 25/07/2015
  7633                              <1> 	; eax = remain bytes in buffer
  7634                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
  7635 0000E3AA 09C0                <1> 	or	eax, eax
  7636 0000E3AC 75EB                <1> 	jnz	short dskw_3 ; (page end before system buffer end!)	
  7637                              <1> 
  7638                              <1> 	; 23/10/2016
  7639 0000E3AE B101                <1> 	mov	cl, 1
  7640 0000E3B0 5E                  <1> 	pop	esi
  7641 0000E3B1 A1[00410100]        <1> 	mov	eax, [writei.sector]
  7642                              <1> 	; esi = logical dos drive description table address
  7643                              <1> 	; eax = sector number
  7644                              <1> 	; ebx = writei buffer address
  7645                              <1> 	; ecx = sector count
  7646 0000E3B6 E8AF050000          <1> 	call	disk_write ; / yes, write the block
  7647 0000E3BB 7307                <1> 	jnc	short dskw_5
  7648                              <1> 
  7649 0000E3BD B812000000          <1> 	mov	eax, 18 ; drive not ready or WRITE ERROR !
  7650 0000E3C2 EB99                <1> 	jmp	short dskw_err
  7651                              <1> 
  7652                              <1> dskw_5:
  7653                              <1> 	; 26/10/2016
  7654 0000E3C4 0FB61D[20410100]    <1> 	movzx	ebx, byte [writei.ofn] ; open file number
  7655 0000E3CB C0E302              <1> 	shl	bl, 2 ; *4
  7656 0000E3CE 8B83[F0440100]      <1> 	mov	eax, [ebx+OF_POINTER]
  7657 0000E3D4 3B83[18450100]      <1> 	cmp	eax, [ebx+OF_SIZE]
  7658 0000E3DA 7606                <1> 	jna	short dskw_6
  7659 0000E3DC 8983[18450100]      <1> 	mov	[ebx+OF_SIZE], eax
  7660                              <1> dskw_6:
  7661                              <1> 	;shr	bl, 2
  7662 0000E3E2 833D[084A0100]00    <1>         cmp     dword [u.count], 0 ; / any more data to write?
  7663 0000E3E9 760A                <1> 	jna	short dskw_7
  7664 0000E3EB A1[10410100]        <1> 	mov	eax, [writei.fclust]
  7665 0000E3F0 E931FFFFFF          <1> 	jmp	dskw_0 ; / yes, branch
  7666                              <1> dskw_7:
  7667                              <1>  	; update last modif. date&time of the file
  7668                              <1> 	; (also updates file size as OF_SIZE)
  7669 0000E3F5 E82E030000          <1> 	call	update_file_lmdt
  7670                              <1> 	;mov	byte [setfmod], 0	
  7671                              <1> 
  7672                              <1> 	; 03/08/2013
  7673 0000E3FA C605[464A0100]00    <1> 	mov	byte [u.kcall], 0
  7674                              <1> 	; 23/10/2016
  7675                              <1> 	;mov	eax, [writei.fclust]
  7676 0000E401 C3                  <1> 	retn
  7677                              <1> 
  7678                              <1> mget_w:
  7679                              <1> 	; 02/11/2016
  7680                              <1> 	; 01/11/2016
  7681                              <1> 	; 23/10/2016, 31/10/2016
  7682                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
  7683                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
  7684                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  7685                              <1> 	;
  7686                              <1> 	; Get existing or (allocate) a new disk block for file
  7687                              <1> 	; 
  7688                              <1> 	; INPUTS ->
  7689                              <1> 	;    [u.fofp] = file offset pointer
  7690                              <1> 	;    [i.size] = file size
  7691                              <1> 	;    [u.count] = byte count	 
  7692                              <1> 	;    EAX = First cluster
  7693                              <1> 	;    [cdev] = Logical dos drive number 	  
  7694                              <1> 	;    [writei.ofn] = File Number
  7695                              <1> 	;		   (Open file index, 0 based)
  7696                              <1> 	;    ([u.off] = file offset)
  7697                              <1> 	; OUTPUTS ->
  7698                              <1> 	;    EAX = logical sector number
  7699                              <1> 	;    ESI = Logical Dos Drive Description Table address
  7700                              <1> 	;
  7701                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI, EBP  
  7702                              <1> 
  7703 0000E402 8B35[F4490100]      <1>         mov     esi, [u.fofp]
  7704 0000E408 8B2E                <1> 	mov	ebp, [esi] ; u.off (or EBX*4+OF_POINTER)
  7705                              <1> 
  7706 0000E40A 29C9                <1> 	sub	ecx, ecx
  7707 0000E40C 8A2D[C6490100]      <1> 	mov	ch, [cdev]
  7708                              <1> 
  7709 0000E412 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  7710 0000E417 01CE                <1> 	add	esi, ecx
  7711                              <1> 
  7712                              <1> 	; 31/10/2016
  7713 0000E419 89C3                <1> 	mov	ebx, eax ; First Cluster or FDT address
  7714                              <1> 
  7715 0000E41B 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  7716 0000E41F 0F86DD010000        <1> 	jna	mget_w_14 ; Singlix FS
  7717                              <1> 
  7718 0000E425 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
  7719 0000E429 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  7720 0000E42D 8815[FE400100]      <1> 	mov	[writei.spc], dl  ; sectors per cluster
  7721 0000E433 F7E2                <1> 	mul	edx
  7722                              <1> 	; edx = 0
  7723                              <1> 	; eax = bytes per cluster (<= 65536)
  7724                              <1> 
  7725                              <1> 	; 02/11/2016
  7726 0000E435 89C1                <1> 	mov	ecx, eax
  7727 0000E437 48                  <1> 	dec	eax
  7728 0000E438 66A3[04410100]      <1> 	mov	[writei.bpc], ax	
  7729                              <1> 	
  7730 0000E43E 89E8                <1> 	mov	eax, ebp
  7731 0000E440 0305[084A0100]      <1> 	add	eax, [u.count] ; next file position
  7732 0000E446 3B05[714A0100]      <1> 	cmp	eax, [i.size] ; <= file size ?
  7733 0000E44C 0F86FC000000        <1> 	jna	mget_w_4 ; no
  7734                              <1> 
  7735 0000E452 F7F1                <1> 	div	ecx
  7736 0000E454 A3[0C410100]        <1> 	mov	[writei.c_index], eax ; cluster index
  7737                              <1> 	; edx = byte offset in cluster (<= 65535)
  7738                              <1> 	;mov	[writei.offset], dx
  7739                              <1> 	;shr	dx, 9 ; / 512
  7740                              <1> 	;mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7741                              <1> 
  7742 0000E459 29D2                <1> 	sub	edx, edx ; 01/11/2016
  7743 0000E45B 8915[00410100]      <1> 	mov 	[writei.sector], edx ; 0
  7744 0000E461 668915[06410100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
  7745 0000E468 8815[FF400100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7746                              <1> 
  7747 0000E46E 89D8                <1> 	mov	eax, ebx ; First Cluster
  7748                              <1> 
  7749                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
  7750 0000E470 3815[FC400100]      <1> 	cmp	byte [writei.valid], dl ; 0 
  7751 0000E476 7624                <1> 	jna	short mget_w_0
  7752                              <1> 
  7753 0000E478 8815[FC400100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
  7754                              <1> 
  7755 0000E47E 3B05[10410100]      <1> 	cmp	eax, [writei.fclust]
  7756 0000E484 7516                <1> 	jne	short mget_w_0
  7757                              <1> 
  7758 0000E486 8A0D[C6490100]      <1> 	mov	cl, [cdev]
  7759 0000E48C 3A0D[FD400100]      <1> 	cmp	cl, [writei.drv]
  7760 0000E492 7508                <1> 	jne	short mget_w_0
  7761                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
  7762                              <1> 	;  we don't need to get last cluster & last cluster index
  7763 0000E494 8B0D[1C410100]      <1> 	mov	ecx, [writei.l_index]
  7764 0000E49A EB64                <1> 	jmp	short mget_w_2
  7765                              <1> mget_w_0:
  7766 0000E49C A3[10410100]        <1> 	mov	[writei.fclust], eax ; first cluster
  7767                              <1> 	; edx = 0
  7768 0000E4A1 A3[08410100]        <1> 	mov	[writei.cluster], eax ; first cluster ; 01/11/2016
  7769 0000E4A6 8915[14410100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret cluster index
  7770                              <1> 
  7771                              <1> 	; FAT file system (FAT12, FAT16, FAT32)
  7772 0000E4AC E87BD5FFFF          <1> 	call	get_last_cluster
  7773 0000E4B1 0F822B010000        <1> 	jc	mget_w_err ; eax = error code
  7774                              <1> 		
  7775 0000E4B7 A3[18410100]        <1> 	mov	[writei.lclust], eax ; last cluster
  7776                              <1> 
  7777 0000E4BC 8B0D[3C3F0100]      <1> 	mov	ecx, [glc_index] ; last cluster index
  7778 0000E4C2 890D[1C410100]      <1> 	mov	[writei.l_index], ecx
  7779                              <1> 
  7780 0000E4C8 A0[20410100]        <1> 	mov	al, [writei.ofn]
  7781 0000E4CD FEC0                <1> 	inc	al
  7782 0000E4CF A2[5B410100]        <1> 	mov	[setfmod], al ; update lm date&time sign
  7783                              <1> 
  7784                              <1> mget_w_1:
  7785 0000E4D4 3B0D[0C410100]      <1> 	cmp	ecx, [writei.c_index]  ; last cluster index
  7786 0000E4DA 7324                <1> 	jnb	short mget_w_2 ; 01/11/2016
  7787                              <1> 
  7788 0000E4DC A1[18410100]        <1> 	mov	eax, [writei.lclust]
  7789                              <1> 	; EAX = Last cluster
  7790 0000E4E1 E854D6FFFF          <1> 	call	add_new_cluster
  7791 0000E4E6 0F82F6000000        <1> 	jc	mget_w_err ; eax = error code
  7792                              <1> 	; edx = 0
  7793 0000E4EC A3[18410100]        <1> 	mov	[writei.lclust], eax ; (new) last cluster
  7794 0000E4F1 8B0D[1C410100]      <1> 	mov	ecx, [writei.l_index]
  7795 0000E4F7 41                  <1> 	inc	ecx ; add 1 to last cluster index
  7796 0000E4F8 890D[1C410100]      <1> 	mov	[writei.l_index], ecx ; current last cluster index
  7797                              <1> 
  7798 0000E4FE EBD4                <1> 	jmp	short mget_w_1
  7799                              <1> 
  7800                              <1> mget_w_2:
  7801 0000E500 89E9                <1> 	mov	ecx, ebp
  7802 0000E502 030D[084A0100]      <1> 	add	ecx, [u.count]
  7803 0000E508 890D[714A0100]      <1> 	mov	[i.size], ecx ; save new file size
  7804                              <1> 	;sub	edx, edx ; 0
  7805                              <1> 
  7806 0000E50E A0[C6490100]        <1> 	mov	al, [cdev]
  7807 0000E513 A2[FD400100]        <1> 	mov	[writei.drv], al ; physical drive number
  7808                              <1> 	; edx = 0
  7809 0000E518 89E8                <1> 	mov	eax, ebp ; file offset
  7810 0000E51A 0FB70D[04410100]    <1> 	movzx	ecx, word [writei.bpc] ; bytes per cluster - 1
  7811 0000E521 41                  <1> 	inc	ecx ; bytes per cluster
  7812 0000E522 F7F1                <1> 	div	ecx
  7813                              <1> 	; edx = byte offset in cluster (<= 65535)
  7814                              <1> 	; eax = cluster index
  7815 0000E524 A3[0C410100]        <1> 	mov	[writei.c_index], eax
  7816 0000E529 668915[06410100]    <1> 	mov	[writei.offset], dx
  7817 0000E530 66C1EA09            <1> 	shr	dx, 9 ; / 512
  7818 0000E534 8815[FF400100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7819                              <1> 
  7820                              <1> mget_w_3:
  7821 0000E53A 3B05[1C410100]      <1> 	cmp	eax, [writei.l_index] ; last cluster index
  7822 0000E540 752A                <1> 	jne	short mget_w_5
  7823                              <1> 
  7824 0000E542 A3[14410100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
  7825 0000E547 A1[18410100]        <1> 	mov	eax, [writei.lclust] ; last cluster
  7826 0000E54C EB60                <1> 	jmp	short mget_w_10
  7827                              <1> 
  7828                              <1> mget_w_4: ; 02/11/2016
  7829                              <1> 	; eax = next file position
  7830 0000E54E 2B05[084A0100]      <1> 	sub	eax, [u.count] ; current file position
  7831                              <1> 	; edx = 0
  7832                              <1> 	; ecx = bytes per cluster
  7833 0000E554 F7F1                <1> 	div	ecx
  7834 0000E556 A3[0C410100]        <1> 	mov	[writei.c_index], eax ; cluster index
  7835 0000E55B 668915[06410100]    <1> 	mov	[writei.offset], dx
  7836 0000E562 66C1EA09            <1> 	shr	dx, 9 ; / 512
  7837 0000E566 8815[FF400100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7838                              <1> 
  7839                              <1> mget_w_5:
  7840 0000E56C 21C0                <1> 	and	eax, eax ; 0 = First Cluster's index number
  7841 0000E56E 750C                <1> 	jnz	short mget_w_6
  7842                              <1> 
  7843 0000E570 A3[14410100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
  7844 0000E575 A1[10410100]        <1> 	mov	eax, [writei.fclust] ; first cluster
  7845 0000E57A EB32                <1> 	jmp	short mget_w_10
  7846                              <1> 
  7847                              <1> mget_w_6:
  7848 0000E57C 3B05[14410100]      <1> 	cmp	eax, [writei.fs_index] ; current cluster index (>0)
  7849 0000E582 7507                <1> 	jne	short mget_w_7
  7850 0000E584 A1[08410100]        <1> 	mov	eax, [writei.cluster] ; current cluster 
  7851 0000E589 EB3A                <1> 	jmp	short mget_w_11
  7852                              <1> 
  7853                              <1> mget_w_7:
  7854 0000E58B 89C1                <1> 	mov	ecx, eax
  7855 0000E58D 2B0D[14410100]      <1> 	sub	ecx, [writei.fs_index]
  7856 0000E593 730D                <1> 	jnc	short mget_w_8
  7857                              <1> 	; get cluster by index from the first cluster
  7858 0000E595 A1[10410100]        <1> 	mov	eax, [writei.fclust]
  7859 0000E59A 8B0D[0C410100]      <1> 	mov	ecx, [writei.c_index]
  7860 0000E5A0 EB05                <1> 	jmp	short mget_w_9
  7861                              <1> 
  7862                              <1> mget_w_8:
  7863 0000E5A2 A1[08410100]        <1> 	mov	eax, [writei.cluster] ; beginning cluster
  7864                              <1> 	; ecx = cluster sequence number after the beginning cluster
  7865                              <1> 	; sub	edx, edx ; 0
  7866                              <1> 
  7867                              <1> mget_w_9:
  7868                              <1> 	; EAX = Beginning cluster
  7869                              <1> 	; EDX = Sector index in disk/file section
  7870                              <1> 	;	(Only for SINGLIX file system!)
  7871                              <1> 	; ECX = Cluster sequence number after the beginning cluster
  7872                              <1> 	; ESI = Logical DOS Drive Description Table address
  7873 0000E5A7 E894D6FFFF          <1> 	call	get_cluster_by_index
  7874 0000E5AC 7234                <1> 	jc	short mget_w_err ; error code in EAX
  7875                              <1> 	; EAX = Cluster number		
  7876                              <1> mget_w_10:
  7877 0000E5AE A3[08410100]        <1> 	mov	[writei.cluster], eax ; FDT number for Singlix File System
  7878                              <1> 
  7879 0000E5B3 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  7880 0000E5B7 7638                <1> 	jna	short mget_w_13
  7881                              <1> 	; 01/11/2016
  7882 0000E5B9 8B15[0C410100]      <1> 	mov	edx, [writei.c_index]
  7883 0000E5BF 8915[14410100]      <1> 	mov	[writei.fs_index], edx
  7884                              <1> mget_w_11:
  7885 0000E5C5 83E802              <1> 	sub	eax, 2
  7886 0000E5C8 0FB615[FE400100]    <1> 	movzx	edx, byte [writei.spc]
  7887 0000E5CF F7E2                <1> 	mul	edx
  7888                              <1> 
  7889 0000E5D1 034668              <1> 	add	eax, [esi+LD_DATABegin]
  7890 0000E5D4 8A15[FF400100]      <1> 	mov	dl, [writei.s_index]
  7891 0000E5DA 01D0                <1> 	add	eax, edx
  7892                              <1> mget_w_12:
  7893 0000E5DC A3[00410100]        <1> 	mov	[writei.sector], eax
  7894                              <1> 	;; buffer validation must be done in writei
  7895                              <1> 	;;mov	byte [writei.valid], 1 
  7896 0000E5E1 C3                  <1> 	retn
  7897                              <1> 
  7898                              <1> mget_w_err:
  7899 0000E5E2 A3[484A0100]        <1> 	mov	[u.error], eax
  7900 0000E5E7 A3[E4490100]        <1> 	mov	[u.r0], eax
  7901 0000E5EC E9A9D7FFFF          <1> 	jmp	error
  7902                              <1> 
  7903                              <1> mget_w_13:
  7904                              <1> 	; EAX = FDT number (Current Section)
  7905                              <1> 	; EDX = Sector index from the first section (0,1,2,3,4...)
  7906 0000E5F1 2B15[14410100]      <1> 	sub	edx, [writei.fs_index]	
  7907                              <1> 	; EDX = Sector index from current section
  7908 0000E5F7 8915[14410100]      <1> 	mov	[writei.fs_index], edx
  7909 0000E5FD 40                  <1> 	inc	eax ; the first data sector in FS disk section	
  7910 0000E5FE 01D0                <1> 	add	eax, edx
  7911 0000E600 EBDA                <1> 	jmp	short mget_w_12
  7912                              <1> 
  7913                              <1> mget_w_14:
  7914 0000E602 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
  7915 0000E605 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
  7916 0000E607 880D[FE400100]      <1> 	mov	[writei.spc], cl  ; sectors per cluster
  7917                              <1> 	; NOTE: writei bytes per sector value is always 512 ! 
  7918 0000E60D 66C705[04410100]00- <1> 	mov	word [writei.bpc], 512
  7918 0000E615 02                  <1>
  7919                              <1> 
  7920 0000E616 89E9                <1> 	mov	ecx, ebp
  7921 0000E618 030D[084A0100]      <1> 	add	ecx, [u.count] ; next file position
  7922 0000E61E 3B0D[714A0100]      <1> 	cmp	ecx, [i.size] ; <= file size ?
  7923 0000E624 0F86C8000000        <1> 	jna	mget_w_19 ; no
  7924                              <1> 
  7925 0000E62A 29D2                <1> 	sub	edx, edx ; 0
  7926 0000E62C 8915[00410100]      <1> 	mov 	[writei.sector], edx ; 0
  7927 0000E632 668915[06410100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
  7928 0000E639 8815[FF400100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7929                              <1> 
  7930 0000E63F C1E909              <1> 	shr	ecx, 9 ; 1 cluster = 512 bytes
  7931 0000E642 890D[0C410100]      <1> 	mov	[writei.c_index], ecx ; section/cluster index
  7932                              <1> 	
  7933 0000E648 89D8                <1> 	mov	eax, ebx ; FDT number (First FDT address)
  7934                              <1> 
  7935                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
  7936 0000E64A 3815[FC400100]      <1> 	cmp	byte [writei.valid], dl ; 0 
  7937 0000E650 7624                <1> 	jna	short mget_w_15
  7938                              <1> 
  7939 0000E652 8815[FC400100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
  7940                              <1> 
  7941 0000E658 3B05[10410100]      <1> 	cmp	eax, [writei.fclust]
  7942 0000E65E 7516                <1> 	jne	short mget_w_15
  7943                              <1> 
  7944 0000E660 8A0D[C6490100]      <1> 	mov	cl, [cdev]
  7945 0000E666 3A0D[FD400100]      <1> 	cmp	cl, [writei.drv]
  7946 0000E66C 7508                <1> 	jne	short mget_w_15
  7947                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
  7948                              <1> 	;  we don't need to get last cluster & last cluster index
  7949 0000E66E 8B0D[1C410100]      <1> 	mov	ecx, [writei.l_index]
  7950 0000E674 EB49                <1> 	jmp	short mget_w_17
  7951                              <1> mget_w_15:
  7952 0000E676 A3[10410100]        <1> 	mov	[writei.fclust], eax ; first section (FDT number)
  7953                              <1> 	; edx = 0
  7954 0000E67B 8915[08410100]      <1> 	mov	[writei.cluster], edx ; 0 ; current section
  7955 0000E681 8915[14410100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret section index
  7956                              <1> 
  7957                              <1> 	; eax = FDT number (section 0 header address)
  7958 0000E687 E8DED5FFFF          <1> 	call	get_last_section
  7959 0000E68C 0F8250FFFFFF        <1> 	jc	mget_w_err ; eax = error code
  7960                              <1> 
  7961 0000E692 8915[14410100]      <1> 	mov 	[writei.fs_index], edx ; sector index in last section
  7962                              <1> 		
  7963 0000E698 A3[18410100]        <1> 	mov	[writei.lclust], eax ; last section address
  7964                              <1> 
  7965 0000E69D 8B0D[3C3F0100]      <1> 	mov	ecx, [glc_index] ; last section index
  7966 0000E6A3 890D[1C410100]      <1> 	mov	[writei.l_index], ecx
  7967                              <1> 
  7968 0000E6A9 A0[20410100]        <1> 	mov	al, [writei.ofn]
  7969 0000E6AE FEC0                <1> 	inc	al
  7970 0000E6B0 A2[5B410100]        <1> 	mov	[setfmod], al ; update lm date&time sign
  7971                              <1> 
  7972                              <1> mget_w_16:
  7973                              <1> 	; edx = (existing) last section (sector) index
  7974 0000E6B5 8B0D[0C410100]      <1> 	mov	ecx, [writei.c_index] ; final section (sector) index
  7975 0000E6BB 29D1                <1> 	sub	ecx, edx
  7976 0000E6BD 7633                <1> 	jna	short mget_w_19
  7977                              <1> 	 ; ecx = sector count
  7978                              <1> mget_w_17:
  7979 0000E6BF A1[18410100]        <1> 	mov	eax, [writei.lclust]
  7980                              <1> 	; ESI = Logical dos drv desc. table address
  7981                              <1>         ; EAX = Last section
  7982                              <1>         ; (ECX = 0 for directory) 
  7983                              <1>         ; ECX = sector count (except FDT)
  7984 0000E6C4 E864CBFFFF          <1> 	call	add_new_fs_section
  7985 0000E6C9 7312                <1> 	jnc	short mget_w_18
  7986                              <1> 
  7987                              <1> 	; If error number = 27h (insufficient disk space)
  7988                              <1> 	; it is needed to check free consequent sectors
  7989                              <1> 	; (1 data sector at least and +1 section header sector) 
  7990                              <1> 
  7991 0000E6CB 83F827              <1> 	cmp	eax, 27h
  7992 0000E6CE 0F850EFFFFFF        <1> 	jne	mget_w_err ; eax = error code
  7993                              <1> 
  7994                              <1> 	; ecx = count of free consequent sectors
  7995                              <1> 	; ecx must be > 1 (1 data + 1 header sector)
  7996 0000E6D4 49                  <1> 	dec	ecx
  7997 0000E6D5 0F8407FFFFFF        <1> 	jz	mget_w_err
  7998 0000E6DB EBE2                <1> 	jmp	short mget_w_17
  7999                              <1> 
  8000                              <1> mget_w_18:
  8001 0000E6DD A3[18410100]        <1> 	mov	[writei.lclust], eax ; (new) last section
  8002                              <1> 	; ecx = sector count (except section header)
  8003 0000E6E2 8B15[1C410100]      <1> 	mov	edx, [writei.l_index]
  8004 0000E6E8 01CA                <1> 	add	edx, ecx ; add sector count to index
  8005 0000E6EA 8915[1C410100]      <1> 	mov	[writei.l_index], edx
  8006 0000E6F0 EBC3                <1> 	jmp	short mget_w_16
  8007                              <1> 
  8008                              <1> mget_w_19:
  8009 0000E6F2 89E9                <1> 	mov	ecx, ebp
  8010 0000E6F4 030D[084A0100]      <1> 	add	ecx, [u.count]
  8011 0000E6FA 890D[714A0100]      <1> 	mov	[i.size], ecx ; save new file size
  8012                              <1> 	;sub	edx, edx ; 0
  8013                              <1> 
  8014 0000E700 A0[C6490100]        <1> 	mov	al, [cdev]
  8015 0000E705 A2[FD400100]        <1> 	mov	[writei.drv], al ; physical drive number
  8016                              <1> 	; edx = 0
  8017 0000E70A 89E8                <1> 	mov	eax, ebp ; file offset
  8018 0000E70C 89C2                <1> 	mov	edx, eax
  8019                              <1> 	; 1 cluster = 512 bytes (for Singlix FS)
  8020 0000E70E C1E809              <1> 	shr	eax, 9  ; / 512
  8021 0000E711 81E2FF010000        <1> 	and	edx, 1FFh
  8022                              <1> 	; edx = byte offset in cluster/sector (<= 511)
  8023                              <1> 	; eax = section (sector/cluster) index
  8024 0000E717 A3[0C410100]        <1> 	mov	[writei.c_index], eax
  8025 0000E71C 668915[06410100]    <1> 	mov	[writei.offset], dx
  8026                              <1> 	;mov	byte [writei.s_index], 0 ; sector index in cluster
  8027 0000E723 E912FEFFFF          <1> 	jmp	mget_w_3
  8028                              <1> 
  8029                              <1> update_file_lmdt: ; & update file size
  8030                              <1> 	; 26/10/2016
  8031                              <1> 	; 24/10/2016
  8032                              <1> 	; 23/10/2016
  8033                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
  8034                              <1> 	;
  8035                              <1> 	; Update last modification date&time of file
  8036                              <1> 	; (call from syswrite -> writei)
  8037                              <1> 	; ((also updates file size)) // 26/10/2016
  8038                              <1> 	; 
  8039                              <1> 	; INPUT:
  8040                              <1> 	;      byte [setfmod] = open file number
  8041                              <1> 	; OUTPUT:
  8042                              <1> 	;      cf = 0 -> success !
  8043                              <1> 	;      cf = 1 -> lmdt update has been failed! 	 
  8044                              <1> 	;
  8045                              <1> 	; Modified registers: eax, ebx, ecx, edx, esi, edi       				
  8046                              <1> 	;
  8047                              <1> 
  8048                              <1> 	;cmp	byte [setfmod], 0
  8049                              <1> 	;jna	short uflmdt_2 ; nothing to do
  8050                              <1> 
  8051 0000E728 31C0                <1> 	xor	eax, eax
  8052                              <1> 
  8053 0000E72A 0FB61D[5B410100]    <1> 	movzx	ebx, byte [setfmod]
  8054 0000E731 FECB                <1> 	dec	bl ; open file index number (0 based)
  8055                              <1> 
  8056 0000E733 8AA3[C8440100]      <1> 	mov	ah, [ebx+OF_DRIVE]
  8057 0000E739 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  8058 0000E73E 01C6                <1> 	add	esi, eax
  8059 0000E740 C0E302              <1> 	shl	bl, 2 ; *4	
  8060 0000E743 8B8B[A0440100]      <1> 	mov	ecx, [ebx+OF_FCLUSTER] ; first cluster
  8061 0000E749 8B93[68450100]      <1> 	mov	edx, [ebx+OF_DIRCLUSTER] ; dir cluster
  8062                              <1> 
  8063 0000E74F D0EB                <1> 	shr	bl, 1 ; /2
  8064 0000E751 0FB7BB[08460100]    <1> 	movzx	edi, word [ebx+OF_DIRENTRY]
  8065                              <1> 	
  8066 0000E758 803D[983C0100]01    <1> 	cmp	byte [DirBuff_ValidData], 1
  8067 0000E75F 726E                <1> 	jb	short uflmdt_4
  8068                              <1> 
  8069 0000E761 A0[963C0100]        <1> 	mov	al, [DirBuff_DRV]
  8070 0000E766 2C41                <1> 	sub	al, 'A'	
  8071 0000E768 38E0                <1> 	cmp	al, ah
  8072 0000E76A 7563                <1> 	jne	short uflmdt_4 ; different drive
  8073 0000E76C 8A4603              <1> 	mov	al, [esi+LD_FATType] 
  8074 0000E76F 3A05[973C0100]      <1> 	cmp	al, [DirBuff_FATType]
  8075 0000E775 755B                <1> 	jne	short uflmdt_5 ; different FS type
  8076 0000E777 3B15[9D3C0100]      <1> 	cmp	edx, [DirBuff_Cluster]
  8077 0000E77D 7553                <1> 	jne	short uflmdt_5 ; different cluster
  8078                              <1> 
  8079                              <1> uflmdt_1:
  8080                              <1> 	; Directory buffer is ready here!
  8081                              <1> 	; OF_FCLUSTER must be compared/verified
  8082 0000E77F BE00000800          <1> 	mov	esi, Directory_Buffer
  8083 0000E784 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
  8084 0000E788 01FE                <1> 	add	esi, edi ; offset
  8085                              <1> 	;
  8086 0000E78A F6460B18            <1> 	test	byte [esi+DirEntry_Attr], 18h ; Vol & Dir
  8087 0000E78E 750F                <1> 	jnz	short uflmdt_2 ; not a valid file !
  8088 0000E790 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI]
  8089 0000E794 C1E010              <1> 	shl	eax, 16
  8090 0000E797 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO]
  8091 0000E79B 39C8                <1> 	cmp	eax, ecx ; same first cluster ?
  8092 0000E79D 7407                <1> 	je	short uflmdt_3 ; yes, it is OK !!!	
  8093                              <1> 
  8094                              <1> uflmdt_2:	
  8095                              <1> 	; save directory buffer if has modified/changed sign
  8096                              <1> 	; (It is good to save dir buff even if the searched
  8097                              <1> 	; directory entry is not found !?)
  8098 0000E79F E8DAB7FFFF          <1> 	call	save_directory_buffer
  8099 0000E7A4 F9                  <1> 	stc	; update failed
  8100 0000E7A5 C3                  <1> 	retn
  8101                              <1> 	
  8102                              <1> uflmdt_3:
  8103                              <1> 	; Update directory entry
  8104                              <1> 	; 26/10/2016
  8105 0000E7A6 D0E3                <1> 	shl	bl, 1 ; *2 
  8106 0000E7A8 8B83[18450100]      <1> 	mov	eax, [ebx+OF_SIZE] ; file size
  8107 0000E7AE 89461C              <1> 	mov	[esi+DirEntry_FileSize], eax
  8108                              <1> 	;
  8109 0000E7B1 E82AB7FFFF          <1> 	call	convert_current_date_time
  8110                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  8111                              <1>         ; 	    AX = Time in dos dir entry format	
  8112 0000E7B6 66894616            <1> 	mov	[esi+DirEntry_WrtTime], ax
  8113 0000E7BA 66895618            <1> 	mov	[esi+DirEntry_WrtDate], dx	
  8114 0000E7BE 66895612            <1> 	mov	[esi+DirEntry_LastAccDate], dx
  8115 0000E7C2 C605[983C0100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  8116 0000E7C9 E8B0B7FFFF          <1> 	call	save_directory_buffer
  8117 0000E7CE C3                  <1> 	retn
  8118                              <1> 
  8119                              <1> uflmdt_4:
  8120                              <1> 	; Directory buffer sector read&write
  8121                              <1> 	; 23/10/2016
  8122                              <1> 	;
  8123 0000E7CF 8A4603              <1> 	mov	al, [esi+LD_FATType]
  8124                              <1> uflmdt_5:
  8125 0000E7D2 BB[B84F0100]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
  8126                              <1> 		
  8127 0000E7D7 20C0                <1> 	and	al, al ; 0 = Singlix FS
  8128 0000E7D9 0F8492000000        <1> 	jz	uflmdt_11
  8129                              <1> 
  8130 0000E7DF 21D2                <1> 	and	edx, edx
  8131 0000E7E1 7521                <1> 	jnz	short uflmdt_9
  8132                              <1> 
  8133 0000E7E3 3C02                <1> 	cmp	al, 2  ; 3 = FAT32
  8134 0000E7E5 771A                <1> 	ja	short uflmdt_8
  8135                              <1> 
  8136 0000E7E7 89F8                <1> 	mov	eax, edi ; directory entry index number
  8137 0000E7E9 66C1E804            <1> 	shr	ax, 4 ; 16 entries per sector	 
  8138 0000E7ED 034664              <1> 	add	eax, [esi+LD_ROOTBegin]
  8139                              <1> 	; eax = root directory sector
  8140                              <1> uflmdt_6:
  8141 0000E7F0 50                  <1> 	push	eax ; * ; disk sector address
  8142 0000E7F1 51                  <1> 	push	ecx ; first cluster	
  8143 0000E7F2 B901000000          <1> 	mov	ecx, 1
  8144                              <1> 	; ecx = sector count
  8145 0000E7F7 E87D010000          <1> 	call	disk_read
  8146 0000E7FC 59                  <1> 	pop	ecx
  8147 0000E7FD 731A                <1> 	jnc	short uflmdt_10
  8148 0000E7FF 58                  <1> 	pop	eax ; *
  8149                              <1> uflmdt_7:
  8150 0000E800 C3                  <1> 	retn	
  8151                              <1> 
  8152                              <1> uflmdt_8:
  8153 0000E801 8B5632              <1> 	mov	edx, [esi+LD_BPB+FAT32_RootFClust]
  8154                              <1> uflmdt_9:
  8155 0000E804 83FA02              <1> 	cmp	edx, 2
  8156 0000E807 72F7                <1> 	jb	short uflmdt_7 ; invalid, nothing to do
  8157                              <1> 
  8158 0000E809 83EA02              <1> 	sub	edx, 2
  8159 0000E80C 89D0                <1> 	mov	eax, edx
  8160 0000E80E 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  8161 0000E812 F7E2                <1> 	mul	edx
  8162 0000E814 034668              <1> 	add	eax, [esi+LD_DATABegin]
  8163                              <1> 	; eax = sub directory (data) sector 
  8164 0000E817 EBD7                <1> 	jmp	short uflmdt_6
  8165                              <1> 
  8166                              <1> uflmdt_10:
  8167                              <1> 	; Directory sector buffer is ready here!
  8168                              <1> 	; OF_FCLUSTER must be compared/verified
  8169                              <1> 	; edi = dir entry index number (<= 2047)
  8170 0000E819 6683E70F            <1> 	and	di, 0Fh ; 16 entries per sector
  8171 0000E81D 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
  8172 0000E821 81C7[B84F0100]      <1> 	add	edi, rw_buffer
  8173                              <1> 	;
  8174 0000E827 F6470B18            <1> 	test	byte [edi+DirEntry_Attr], 18h ; Vol & Dir
  8175 0000E82B 0F856EFFFFFF        <1> 	jnz	uflmdt_2 ; not a valid file !
  8176 0000E831 668B5714            <1> 	mov	dx, [edi+DirEntry_FstClusHI]
  8177 0000E835 C1E210              <1> 	shl	edx, 16
  8178 0000E838 668B571A            <1> 	mov	dx, [edi+DirEntry_FstClusLO]
  8179 0000E83C 39CA                <1> 	cmp	edx, ecx ; same first cluster ?
  8180 0000E83E 0F855BFFFFFF        <1> 	jne	uflmdt_2 ; no !?
  8181                              <1> 
  8182                              <1> 	; Update directory entry
  8183 0000E844 E897B6FFFF          <1> 	call	convert_current_date_time
  8184                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  8185                              <1>         ; 	    AX = Time in dos dir entry format	
  8186 0000E849 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
  8187 0000E84D 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
  8188 0000E851 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
  8189                              <1> 	
  8190 0000E855 58                  <1> 	pop	eax ; *
  8191                              <1> 
  8192 0000E856 BB[B84F0100]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
  8193 0000E85B B901000000          <1> 	mov	ecx, 1
  8194                              <1> 	; esi = logical dos description table address
  8195                              <1> 	; eax = disk sector number/address (LBA)
  8196                              <1> 	; ecx = sector count
  8197                              <1> 	; ebx = buffer address
  8198 0000E860 E805010000          <1> 	call	disk_write
  8199 0000E865 0F8234FFFFFF        <1> 	jc	uflmdt_2
  8200                              <1> 	
  8201                              <1> 	; save directory buffer if has modified/changed sign
  8202 0000E86B E80EB7FFFF          <1> 	call	save_directory_buffer
  8203 0000E870 C3                  <1> 	retn
  8204                              <1> 
  8205                              <1> uflmdt_11:
  8206                              <1> 	; 24/10/2016
  8207                              <1> 	; Update last modification date & time of a file
  8208                              <1> 	; on a disk with Singlix File System.
  8209                              <1> 	;
  8210                              <1> 	; (Method: Read the FDT -File Description Table-
  8211                              <1> 	; sector of the file and update the lmdt data fields,
  8212                              <1> 	; then write FDT sector to the disk.
  8213                              <1> 	; /// It is easy but there is compatibility buffer
  8214                              <1> 	; method also for changing directory entry data and
  8215                              <1> 	; also there are some programming issues for Singlix
  8216                              <1> 	; file system (TRFS), which are not completed yet!)
  8217                              <1> 	;
  8218                              <1> 	; Not ready yet ! (24/10/2016)
  8219                              <1> 	; /// Temporary code for error return ! ///
  8220 0000E871 31C0                <1> 	xor	eax, eax
  8221 0000E873 F9                  <1> 	stc
  8222 0000E874 C3                  <1> 	retn
  8223                              <1> 
  8224                              <1> sysalloc:
  8225                              <1> 	; 20/02/2017
  8226                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
  8227                              <1> 	; (TRDOS 386 feature only!)
  8228                              <1> 	;
  8229                              <1> 	; Allocate Contiguous Memory Block/Pages (for user)
  8230                              <1> 	; (System call for DMA Buffer allocation etc.)	
  8231                              <1> 	;
  8232                              <1> 	; INPUT ->
  8233                              <1> 	;	EBX = Virtual address (for user)
  8234                              <1> 	;	     (Physical memory block/aperture
  8235                              <1> 	;	     will be mapped to this virtual address) 
  8236                              <1> 	;	ECX = Byte Count
  8237                              <1> 	;	     (will be rounded up to page border)
  8238                              <1> 	;	If ECX = 0
  8239                              <1> 	;	    System call will return with an error (cf=1)
  8240                              <1> 	;	    but ECX will contain maximum size of
  8241                              <1> 	;	    available memory aperture and physical
  8242                              <1> 	;	    (beginning) address of that aperture
  8243                              <1> 	;	    (which have maximum size) will be in EAX.
  8244                              <1> 	;	EDX = Upper limit of the requested physical memory
  8245                              <1> 	;	      block/pages.
  8246                              <1> 	;	     (The last byte address of the memory aperture 
  8247                              <1> 	;	      must not be equal to or above this limit.)	
  8248                              <1> 	;	If EDX = 0
  8249                              <1> 	; 	   there is NOLIMIT !
  8250                              <1> 	;	If EDX = 0FFFFFFFFh (-1) 
  8251                              <1> 	;	   ESI = Lower Limit !
  8252                              <1> 	;		(Beginning of the block must not be 'less'
  8253                              <1> 	;		than this.) (Must be equal to or above...)
  8254                              <1> 	;	   EDI = Upper Limit !
  8255                              <1> 	;		(End of the block must be !less! than this)
  8256                              <1> 	;		(The last byte addr of the memory aperture 
  8257                              <1> 	;		must not be equal to or above this limit.)
  8258                              <1> 	;
  8259                              <1> 	; OUTPUT ->
  8260                              <1> 	;	If CF = 0
  8261                              <1> 	;	EAX = Physical address of the allocated memory block
  8262                              <1> 	;	ECX = Allocated bytes (as rounded up to page borders)
  8263                              <1> 	;	EBX = Virtual address (as rounded up)
  8264                              <1> 	;	IF CF = 1
  8265                              <1> 	;	    Requested (size of) Memory block could not be 
  8266                              <1> 	;	    allocated to the user!	
  8267                              <1> 	;	IF CF = 1 & EAX = 0 (Insufficient memory error!)
  8268                              <1> 	;	   ECX = Total number of free bytes
  8269                              <1> 	;	         (not size of available contiguous bytes!)		 	
  8270                              <1> 	;	If CF = 1 & EAX > 0
  8271                              <1> 	;	   there is not a memory aperture with requested size
  8272                              <1> 	;	   but total free mem is not less than requested size.
  8273                              <1> 	;	   EAX = Physical addr of available memory aperture
  8274                              <1> 	;	   	 with max size 
  8275                              <1> 	;	        (but it doesn't fit to the conditions!) 	
  8276                              <1> 	;	   ECX = Size of available memory aperture in bytes.
  8277                              <1> 	;	If CF = 1 -> EAX = 0FFFFFFFFh	
  8278                              <1> 	;	   Conditions/Parameters are wrong !		 		
  8279                              <1> 	;	   ECX is same with input value.
  8280                              <1> 	;
  8281                              <1> 	; Note:	Previously allocated pages will be deallocated if
  8282                              <1> 	;       new allocation conditions are met.
  8283                              <1> 	;
  8284                              <1> 	; Note: u.break control may be included in future versions	
  8285                              <1> 	;
  8286                              <1> 
  8287 0000E875 31C0                <1> 	xor	eax, eax ; 0
  8288 0000E877 09D2                <1> 	or	edx, edx
  8289 0000E879 7418                <1> 	jz	short sysalloc_2 ; NOLIMIT
  8290 0000E87B 48                  <1> 	dec	eax ; 0FFFFFFFFh  (-1)
  8291 0000E87C 39D1                <1> 	cmp	ecx, edx
  8292 0000E87E 7744                <1> 	ja	short sysalloc_wrong
  8293 0000E880 39C2                <1> 	cmp	edx, eax ; 0FFFFFFFFh (-1)
  8294 0000E882 750E                <1> 	jne	short sysalloc_1
  8295 0000E884 89FA                <1> 	mov	edx, edi ; upper limit
  8296 0000E886 29F7                <1> 	sub	edi, esi
  8297 0000E888 763A                <1> 	jna	short sysalloc_wrong
  8298 0000E88A 39CF                <1> 	cmp	edi, ecx ; byte count
  8299 0000E88C 7236                <1> 	jb	short sysalloc_wrong
  8300 0000E88E 89F0                <1> 	mov	eax, esi ; lower limit, beginning address
  8301 0000E890 EB01                <1> 	jmp	short sysalloc_2
  8302                              <1> sysalloc_1:
  8303 0000E892 40                  <1> 	inc	eax ; 0
  8304                              <1> sysalloc_2:
  8305                              <1> 	; EAX = Beginning address (physical)
  8306                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  8307                              <1> 	; ECX = Number of bytes to be allocated		
  8308 0000E893 E8686BFFFF          <1> 	call	allocate_memory_block
  8309 0000E898 7221                <1> 	jc	short sysalloc_err
  8310                              <1> 	; EAX = Beginning (physical) addr of the allocated mem block
  8311                              <1> 	; ECX = Num of allocated bytes (rounded up to page borders) 	
  8312 0000E89A 09D2                <1> 	or	edx, edx ; is there a limit ?
  8313 0000E89C 7516                <1> 	jnz	short sysalloc_7 ; yes
  8314                              <1> sysalloc_3:
  8315                              <1> 	; Here, requested contiquous memory pages have been allocated
  8316                              <1> 	; on Memory Allocation Table but user's page directory 
  8317                              <1> 	; and page tables have not been updated yet!
  8318 0000E89E 50                  <1> 	push	eax ; *
  8319                              <1> sysalloc_6:
  8320 0000E89F 51                  <1> 	push	ecx ; **
  8321                              <1> 	; ebx = virtual address (will be rounded up to page border)
  8322                              <1> 	; ecx = number of bytes to be allocated
  8323                              <1> 	;	will be adjusted to ebx+ecx round down - ebx round up
  8324 0000E8A0 E89C6EFFFF          <1> 	call	deallocate_user_pages 
  8325 0000E8A5 7327                <1> 	jnc	short sysalloc_4
  8326 0000E8A7 59                  <1> 	pop	ecx ; **
  8327 0000E8A8 58                  <1> 	pop	eax ; *
  8328                              <1> 	; error
  8329                              <1> 	; restore Memory Allocation Table Content
  8330 0000E8A9 E8536DFFFF          <1> 	call	deallocate_memory_block
  8331 0000E8AE 31C0                <1> 	xor	eax, eax ; 0
  8332 0000E8B0 6648                <1> 	dec	ax ; 0FFFFFFFFh
  8333 0000E8B2 EB10                <1> 	jmp	short sysalloc_wrong
  8334                              <1> 
  8335                              <1> sysalloc_7:
  8336                              <1> 	; check upper limit overlap
  8337 0000E8B4 50                  <1> 	push	eax ; *
  8338                              <1> 	; ecx = byte count
  8339                              <1> 	; eax = beginning address (physical)	
  8340 0000E8B5 01C8                <1> 	add	eax, ecx
  8341 0000E8B7 39D0                <1> 	cmp	eax, edx
  8342                              <1> 	;pop	eax ; * 
  8343                              <1> 	;jb	short sysalloc_3
  8344 0000E8B9 72E4                <1> 	jb	short sysalloc_6		
  8345                              <1> sysalloc_err:
  8346 0000E8BB 8B2D[E0490100]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  8347 0000E8C1 894D18              <1> 	mov	[ebp+24], ecx ; return to user with ecx value 
  8348                              <1> sysalloc_wrong:
  8349                              <1> 	; eax = 0FFFFFFFFh
  8350 0000E8C4 A3[E4490100]        <1> 	mov	[u.r0], eax
  8351 0000E8C9 E9CCD4FFFF          <1> 	jmp	error
  8352                              <1> 	
  8353                              <1> sysalloc_4:
  8354 0000E8CE 8B2D[E0490100]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  8355 0000E8D4 894518              <1> 	mov	[ebp+24], eax ; return to user with ecx value 
  8356 0000E8D7 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx
  8357 0000E8DA 89C1                <1> 	mov	ecx, eax ; byte count (from 'deallocate_user_pages')
  8358 0000E8DC 5A                  <1> 	pop	edx ; ** ; discard (another) byte count
  8359 0000E8DD 58                  <1> 	pop	eax ; *
  8360 0000E8DE A3[E4490100]        <1> 	mov	[u.r0], eax ; physical address
  8361                              <1> 	;
  8362                              <1> 	; Write newly allocated contiguous (physical) pages
  8363                              <1> 	; on page dir and page tables of current user/process	
  8364                              <1> 	; as PRESENT, USER, WRITABLE
  8365                              <1> 	; (then clear allocated pages)
  8366 0000E8E3 E84F6FFFFF          <1> 	call	allocate_user_pages
  8367 0000E8E8 0F83CCD4FFFF        <1> 	jnc	sysret ; OK! return to process with success...
  8368                              <1> 	;
  8369                              <1> 	; unexpected error ! insufficient memory !? conflict !?
  8370                              <1> 	; (!!?there is not a free page for a new page table?!!)
  8371                              <1> 	; We need to terminate process with error message !!!  
  8372                              <1> 	;
  8373 0000E8EE 8B2D[E0490100]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  8374 0000E8F4 8B4D18              <1> 	mov	ecx, [ebp+24] ; byte count
  8375 0000E8F7 A1[E4490100]        <1> 	mov	eax, [u.r0]   ; physical address
  8376                              <1> 	;
  8377                              <1> 	; restore Memory Allocation Table Content
  8378 0000E8FC E8006DFFFF          <1> 	call	deallocate_memory_block
  8379                              <1> 	;
  8380 0000E901 803D[E2FB0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80x25 text mode?
  8381 0000E908 7407                <1> 	je	short sysalloc_5 ; yes
  8382                              <1> 	; Current mode is VGA (or CGA graphics) mode,
  8383                              <1> 	; We need to return to text mode for displaying
  8384                              <1> 	; error message just before 'sysexit'.  
  8385 0000E90A B003                <1> 	mov	al, 3
  8386 0000E90C E8452CFFFF          <1> 	call	_set_mode
  8387                              <1> sysalloc_5:
  8388 0000E911 BE[76F30000]        <1> 	mov	esi, beep_Insufficient_Memory ; error message
  8389 0000E916 E85673FFFF          <1> 	call	print_msg ; print/display the message
  8390 0000E91B B801000000          <1> 	mov	eax, 1 ; ax=1 is needed for 'sysexit' procedure
  8391 0000E920 E994D5FFFF          <1> 	jmp	sysexit ; and terminate the process !
  8392                              <1> 
  8393                              <1> sysdalloc:
  8394                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
  8395                              <1> 	; (TRDOS 386 feature only!)
  8396                              <1> 	;
  8397                              <1> 	; Deallocate Memory Block/Pages (for user)
  8398                              <1> 	; (Complementary call for sysalloc.)	
  8399                              <1> 	;
  8400                              <1> 	; INPUT ->
  8401                              <1> 	;	EBX = Virtual address (for user)
  8402                              <1> 	;	      (will be rounded up to page border)
  8403                              <1> 	;	ECX = Byte Count
  8404                              <1> 	;	     (will be adjusted to page borders)
  8405                              <1> 	;	If ICX = 0
  8406                              <1> 	;	   nothing to do
  8407                              <1> 	;	If EBX + ECX > User's ESP
  8408                              <1> 	;	   nothing to do		
  8409                              <1> 	; 
  8410                              <1> 	; Note: u.break control may be included in future versions	
  8411                              <1> 	;
  8412                              <1> 	; OUTPUT ->
  8413                              <1> 	;	If CF = 0
  8414                              <1> 	;	   EAX = Deallocated memory bytes
  8415                              <1> 	;	   EBX = Virtual address (as rounded up)	
  8416                              <1> 	;	IF CF = 1
  8417                              <1> 	;	   EAX = 0
  8418                              <1> 	;
  8419                              <1> 	; Note:	Main purpose of this call is to deallocate/release
  8420                              <1> 	;	previously allocated (physically) contiguous memory
  8421                              <1> 	;	pages but beginning (virtual) address may not be
  8422                              <1> 	;	followed by physically contiguous pages. So, this
  8423                              <1> 	;	system call will deallocate user's virtually
  8424                              <1> 	;	contiguous memory pages. Also, there is not any
  8425                              <1> 	;	objections to use this system call without sysalloc
  8426                              <1> 	;	system call; only possible objection is to lost data
  8427                              <1> 	;	within user's memory space, if the beginning address
  8428                              <1> 	;	and size is not proper.
  8429                              <1> 	;
  8430                              <1> 	; Note: Empty page tables will not be deallocated!!!
  8431                              <1> 	;       (they will be deallocated at process termination)
  8432                              <1> 	;
  8433                              <1> 	; Note: When the program terminates itself or when it is 
  8434                              <1> 	;	terminated by operating system kernel, all allocated
  8435                              <1> 	;	memory pages will be deallocated during termination
  8436                              <1> 	;	stage. So, 'sysdalloc' is not necessary except 
  8437                              <1> 	;	forgiving memory block to other programs/processes.
  8438                              <1> 	;	
  8439 0000E925 8B15[DC490100]      <1> 	mov	edx, [u.sp]
  8440 0000E92B 8B420C              <1> 	mov	eax, [edx+12] ; user's stack pointer
  8441 0000E92E 29C8                <1> 	sub	eax, ecx ; esp - byte count
  8442 0000E930 24FC                <1> 	and	al, 0FCh ; dword alignment
  8443 0000E932 39D8                <1> 	cmp	eax, ebx
  8444 0000E934 7220                <1> 	jb	short sysdalloc_err ; deallocation overlaps with stack 	
  8445                              <1> 
  8446 0000E936 31C0                <1> 	xor	eax, eax
  8447 0000E938 21C9                <1> 	and	ecx, ecx
  8448 0000E93A 7407                <1> 	jz	short sysdalloc_2
  8449                              <1> 	
  8450 0000E93C E8006EFFFF          <1> 	call	deallocate_user_pages
  8451 0000E941 7213                <1> 	jc	short sysdalloc_err
  8452                              <1> 
  8453                              <1> sysdalloc_2:
  8454 0000E943 A3[E4490100]        <1> 	mov	[u.r0], eax
  8455 0000E948 8B2D[E0490100]      <1> 	mov	ebp, [u.usp]
  8456 0000E94E 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx
  8457 0000E951 E964D4FFFF          <1> 	jmp	sysret
  8458                              <1> 
  8459                              <1> sysdalloc_err:
  8460 0000E956 A3[E4490100]        <1> 	mov	[u.r0], eax ; 0
  8461 0000E95B E93AD4FFFF          <1> 	jmp	error
  8462                              <1> 
  8463                              <1> ;maknod: 
  8464                              <1> 	; 26/10/2016
  8465                              <1> 	; temporary
  8466                              <1> ;	retn
  8467                              <1> 	
  8468                              <1> ; temporary - 24/01/2016
  8469                              <1> 
  8470                              <1> iget:
  8471 0000E960 C3                  <1> 	retn
  8472                              <1> isintr:
  8473 0000E961 C3                  <1> 	retn
  8474                              <1> iopen:
  8475 0000E962 C3                  <1> 	retn
  8476                              <1> iclose:
  8477 0000E963 C3                  <1> 	retn
  8478                              <1> setimod:
  8479 0000E964 C3                  <1> 	retn
  8480                              <1> sndc:
  8481 0000E965 C3                  <1> 	retn
  8482                              <1> access:
  8483 0000E966 C3                  <1> 	retn
  8484                              <1> epoch:
  8485 0000E967 C3                  <1> 	retn
  8486                              <1> sleep:
  8487 0000E968 C3                  <1> 	retn
  8488                              <1> set_date_time:
  8489 0000E969 C3                  <1> 	retn
  2160                                  %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 0000E96A 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    20 0000E96E 777B                <1>         ja      short lba_write
    21                              <1> 
    22                              <1> chs_write:
    23                              <1> 	; 25/02/2016
    24                              <1> 	; 23/02/2016
    25 0000E970 C605[613D0100]03    <1> 	mov	byte [disk_rw_op], 3 ; CHS write
    26 0000E977 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 0000E979 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    47 0000E97D 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 0000E97F C605[613D0100]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 0000E986 C605[623D0100]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 0000E98D 50                  <1> 	push	eax			; Linear sector #
    80 0000E98E 51                  <1> 	push	ecx			; # of FAT/FILE/DIR sectors
    81                              <1>                 
    82 0000E98F 0FB74E1E            <1> 	movzx	ecx, word [esi+LD_BPB+SecPerTrack]
    83                              <1> 	;movzx	ecx, byte [disk_rw_spt] ; 23/02/2016
    84 0000E993 29D2                <1> 	sub	edx, edx
    85 0000E995 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 0000E997 6689D1              <1> 	mov	cx, dx			; Sector (zero based)
    90 0000E99A 6641                <1> 	inc	cx			; To make it 1 based
    91 0000E99C 6651                <1> 	push	cx
    92 0000E99E 668B4E20            <1> 	mov	cx, [esi+LD_BPB+Heads]
    93 0000E9A2 6629D2              <1> 	sub	dx, dx
    94 0000E9A5 F7F1                <1> 	div	ecx			; Convert track to head & cyl
    95                              <1> 	; eax (ax) = cylinder, dx (dl) = head (max. FFh)
    96 0000E9A7 88D6                <1> 	mov	dh, dl
    97 0000E9A9 6659                <1> 	pop	cx			; AX=Cyl, DH=Head, CX=Sector
    98 0000E9AB 8A5602              <1> 	mov	dl, [esi+LD_PhyDrvNo]
    99                              <1> 
   100 0000E9AE 88C5                <1> 	mov	ch, al			; NOTE: max. 1023 cylinders !                   
   101 0000E9B0 C0CC02              <1> 	ror	ah, 2			; Rotate 2 bits right
   102 0000E9B3 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 0000E9B5 B001                <1> 	mov	al, 1 ; 25/02/2016
   113 0000E9B7 8A25[613D0100]      <1> 	mov	ah, [disk_rw_op]  ; 02h = chs read, 03h = chs write 
   114                              <1> 	;
   115 0000E9BD E83558FFFF          <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 0000E9C2 8825[633D0100]      <1> 	mov	[disk_rw_err], ah
   122                              <1> 	
   123 0000E9C8 59                  <1> 	pop	ecx
   124 0000E9C9 58                  <1> 	pop	eax
   125 0000E9CA 7314                <1> 	jnc	short chs_read_ok
   126                              <1> 
   127 0000E9CC 803D[633D0100]09    <1> 	cmp	byte [disk_rw_err], 09h ; DMA crossed 64K segment boundary
   128 0000E9D3 7408                <1> 	je	short chs_read_error_retn
   129                              <1>              
   130 0000E9D5 FE0D[623D0100]      <1> 	dec	byte [retry_count]
   131 0000E9DB 75B0                <1> 	jnz	short chs_read_retry
   132                              <1> 
   133                              <1> chs_read_error_retn:
   134 0000E9DD F9                  <1> 	stc
   135                              <1> 	;retn
   136 0000E9DE 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 0000E9E0 40                  <1> 	inc	eax ; next sector
   154 0000E9E1 81C300020000        <1> 	add	ebx, 512
   155 0000E9E7 E29D                <1> 	loop	chs_read_next_sector
   156 0000E9E9 EB5E                <1> 	jmp	short update_drv_error_byte
   157                              <1> 
   158                              <1> lba_write:
   159                              <1> 	; 23/02/2016
   160 0000E9EB C605[613D0100]1C    <1> 	mov	byte [disk_rw_op], 1Ch ; LBA write
   161 0000E9F2 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 0000E9F4 C605[613D0100]1B    <1> 	mov	byte [disk_rw_op], 1Bh ; LBA read
   185                              <1> 
   186                              <1> lba_rw:
   187                              <1> 	; 17/02/2016
   188 0000E9FB 57                  <1> 	push	edi
   189                              <1> 
   190 0000E9FC 890D[643D0100]      <1> 	mov	[sector_count], ecx ; total sector (read) count
   191                              <1> 
   192 0000EA02 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 0000EA05 81F900010000        <1> 	cmp	ecx, 256
   197 0000EA0B 7605                <1> 	jna	short lba_read_rsc
   198 0000EA0D B900010000          <1> 	mov	ecx, 256 ; 17/02/2016
   199                              <1> lba_read_rsc:
   200 0000EA12 290D[643D0100]      <1> 	sub	[sector_count], ecx ; remain sectors
   201                              <1> 
   202 0000EA18 89CF                <1> 	mov	edi, ecx 
   203 0000EA1A 89C1                <1> 	mov	ecx, eax ; sector number/address
   204                              <1> 
   205 0000EA1C C605[623D0100]04    <1> 	mov	byte [retry_count], 4
   206                              <1> lba_read_retry:
   207 0000EA23 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 0000EA25 8A25[613D0100]      <1> 	mov	ah, [disk_rw_op] ; 1Bh = LBA read, 1Ch = LBA write
   217 0000EA2B E8C757FFFF          <1> 	call	int13h
   218                              <1> 	; al = ? (changed)
   219                              <1> 	; ah = error code
   220 0000EA30 8825[633D0100]      <1> 	mov	[disk_rw_err], ah
   221 0000EA36 7334                <1> 	jnc	short lba_read_ok
   222 0000EA38 80FC80              <1> 	cmp	ah, 80h ; time out?
   223 0000EA3B 740A                <1>         je      short lba_read_stc_retn
   224 0000EA3D FE0D[623D0100]      <1> 	dec	byte [retry_count]
   225 0000EA43 7FDE                <1> 	jg	short lba_read_retry
   226 0000EA45 743A                <1> 	jz	short lba_read_reset
   227                              <1> 	; sf =  1
   228                              <1> 
   229                              <1> lba_read_stc_retn:
   230 0000EA47 F9                  <1> 	stc
   231                              <1> lba_read_retn:
   232 0000EA48 5F                  <1> 	pop	edi
   233                              <1> 
   234                              <1> update_drv_error_byte:
   235 0000EA49 9C                  <1> 	pushf
   236 0000EA4A 53                  <1> 	push	ebx
   237 0000EA4B 6651                <1> 	push	cx
   238                              <1> 	;or	ecx, ecx
   239                              <1> 	;jz	short udrv_errb0
   240 0000EA4D 8A0D[633D0100]      <1> 	mov	cl, [disk_rw_err]
   241                              <1> udrv_errb0:
   242 0000EA53 0FB65E02            <1> 	movzx	ebx, byte [esi+LD_PhyDrvNo]
   243 0000EA57 80FB02              <1> 	cmp	bl, 2
   244 0000EA5A 7203                <1>         jb      short udrv_errb1
   245 0000EA5C 80EB7E              <1> 	sub	bl, 7Eh
   246                              <1> 	;cmp	bl, 5
   247                              <1> 	;ja	short udrv_errb2	
   248                              <1> udrv_errb1:
   249 0000EA5F 81C3[69FA0000]      <1>         add     ebx, drv.error ; 13/02/2016
   250 0000EA65 880B                <1> 	mov	[ebx], cl ; error code
   251                              <1> udrv_errb2:
   252 0000EA67 6659                <1> 	pop	cx
   253 0000EA69 5B                  <1> 	pop	ebx
   254 0000EA6A 9D                  <1> 	popf
   255 0000EA6B C3                  <1> 	retn
   256                              <1> 
   257                              <1> lba_read_ok:
   258 0000EA6C 89C8                <1> 	mov	eax, ecx ; sector number
   259 0000EA6E 01F8                <1> 	add	eax, edi ; sector number (next)
   260 0000EA70 C1E709              <1> 	shl	edi, 9 ; sector count * 512
   261 0000EA73 01FB                <1> 	add	ebx, edi ; next buffer offset
   262                              <1> 
   263 0000EA75 8B0D[643D0100]      <1> 	mov	ecx, [sector_count] ; remaining sectors
   264 0000EA7B 09C9                <1> 	or	ecx, ecx
   265 0000EA7D 7586                <1> 	jnz	short lba_read_next
   266 0000EA7F EBC7                <1> 	jmp	short lba_read_retn
   267                              <1> 
   268                              <1> lba_read_reset:
   269 0000EA81 B40D                <1> 	mov	ah, 0Dh ; Alternate reset
   270 0000EA83 E86F57FFFF          <1>         call	int13h
   271                              <1> 	; al = ? (changed)
   272                              <1> 	; ah = error code
   273 0000EA88 7399                <1> 	jnc	short lba_read_retry
   274 0000EA8A EBBC                <1> 	jmp	short lba_read_retn
  2161                                  %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: 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> ; 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 0000EA8C 3A05[334A0100]      <1>         cmp     al, [u.uno]     ; same process ?
   114 0000EA92 750C                <1> 	jne	short srunseq_2 ; no
   115                              <1> 
   116 0000EA94 8A25[294A0100]      <1> 	mov	ah, [u.pri] 	; present/current priority
   117 0000EA9A 80FC02              <1> 	cmp	ah, 2       	; 'run for event' priority level
   118 0000EA9D 7221                <1> 	jb	short srunseq_6 ; no
   119                              <1> 
   120                              <1> srunseq_1:
   121                              <1> 	; there is nothing to do!
   122 0000EA9F 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 0000EAA0 80FA02              <1> 	cmp	dl, 2 		; event queue
   131 0000EAA3 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 0000EAA5 3A15[294A0100]      <1> 	cmp	dl, [u.pri] 	; priority of present process
   139 0000EAAB 7606                <1> 	jna	short srunseq_3 ; is high, also
   140                              <1> 	;
   141                              <1> 	; present process will be swapped/switched out
   142 0000EAAD FE05[3D410100]      <1> 	inc	byte [p_change] ; 1
   143                              <1> 
   144                              <1> srunseq_3:
   145                              <1> 	; add process to 'runq_event' queue for new event
   146 0000EAB3 BB[D2490100]        <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 0000EAB8 E8F8F4FFFF          <1> 	call	putlu
   152 0000EABD C3                  <1> 	retn
   153                              <1> 
   154                              <1> srunseq_5:
   155 0000EABE F5                  <1> 	cmc
   156 0000EABF C3                  <1> 	retn
   157                              <1> 
   158                              <1> srunseq_6:
   159                              <1> 	; present priority of the process is not high
   160                              <1> 	
   161 0000EAC0 8815[294A0100]      <1> 	mov	[u.pri], dl ; new priority 
   162                              <1> 			    ; (will be used by 'tswap')
   163                              <1> 
   164 0000EAC6 80FA02              <1> 	cmp	dl, 2 		; high priority ?
   165 0000EAC9 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 0000EACB BB[D4490100]        <1> 	mov	ebx, runq_normal ; 'run as regular' queue
   173                              <1> 
   174 0000EAD0 20E4                <1> 	and	ah, ah  ;  previous value of [u.pri]
   175 0000EAD2 75E4                <1> 	jnz	short srunseq_4
   176                              <1> 
   177 0000EAD4 43                  <1> 	inc	ebx
   178 0000EAD5 43                  <1> 	inc	ebx
   179                              <1> 	; ebx = runq_background ; 'run on backgroud' queue 
   180                              <1> 
   181 0000EAD6 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 0000EAD8 803D[284A0100]00    <1> 	cmp	byte [u.quant], 0
   191 0000EADF 772C                <1> 	ja	short clk_1
   192                              <1> 	;
   193 0000EAE1 803D[334A0100]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 0000EAE8 7623                <1> 	jna	short clk_1 ; yes, do not swap out
   197                              <1> 	;
   198 0000EAEA 803D[DB490100]FF    <1> 	cmp     byte [sysflg], 0FFh ; user or system space ?
   199 0000EAF1 7520                <1> 	jne	short clk_2 	    ; system space (sysflg <> 0FFh)
   200                              <1> 	;
   201 0000EAF3 66833D[2A4A0100]00  <1> 	cmp	word [u.intr], 0
   202 0000EAFB 7616                <1> 	jna	short clk_2
   203                              <1> 	;
   204                              <1> 	; 23/05/2016
   205 0000EAFD 803D[3E410100]00    <1> 	cmp	byte [multi_tasking], 0
   206 0000EB04 760D                <1> 	jna	short clk_2
   207                              <1> 	;
   208 0000EB06 FE05[3D410100]      <1> 	inc	byte [p_change] ; it is time to change running process	
   209 0000EB0C C3                  <1> 	retn
   210                              <1> clk_1:
   211 0000EB0D FE0D[284A0100]      <1> 	dec	byte [u.quant]
   212                              <1> clk_2:
   213 0000EB13 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 0000EB14 80FC05              <1> 	cmp	ah, 5
   251 0000EB17 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 0000EB19 FB                  <1> 	sti
   258                              <1> 	
   259                              <1> 	;sti	; enable interrupts
   260 0000EB1A 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   261                              <1> 
   262 0000EB1F 80FC01              <1> 	cmp	ah, 1
   263 0000EB22 7205                <1> 	jb	short int34h_0
   264 0000EB24 7705                <1> 	ja	short int34h_1
   265                              <1> 
   266 0000EB26 EE                  <1> 	out	dx, al
   267                              <1> 	;iretd
   268 0000EB27 EB01                <1> 	jmp short int34h_iret
   269                              <1> 
   270                              <1> int34h_0:
   271 0000EB29 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 0000EB2A CF                  <1> 	iretd 
   278                              <1> 
   279                              <1> int34h_1:
   280 0000EB2B F6C401              <1> 	test	ah, 1
   281 0000EB2E 7511                <1> 	jnz	short int34h_3 ; out
   282                              <1> 
   283                              <1> 	; in
   284 0000EB30 80FC02              <1> 	cmp	ah, 2
   285 0000EB33 7707                <1> 	ja	short int34h_2
   286                              <1> 
   287 0000EB35 6689D8              <1> 	mov	ax, bx
   288 0000EB38 66ED                <1> 	in	ax, dx
   289                              <1> 	;iretd
   290 0000EB3A EBEE                <1> 	jmp	short int34h_iret
   291                              <1> 
   292                              <1> int34h_2:
   293                              <1> 	; ah = 4
   294 0000EB3C 89D8                <1> 	mov	eax, ebx
   295 0000EB3E ED                  <1> 	in	eax, dx
   296                              <1> 	;iretd
   297 0000EB3F EBE9                <1> 	jmp	short int34h_iret
   298                              <1> 
   299                              <1> int34h_3:
   300 0000EB41 80FC03              <1> 	cmp	ah, 3
   301 0000EB44 7707                <1> 	ja	short int34h_4
   302                              <1> 
   303 0000EB46 6689D8              <1> 	mov	ax, bx
   304 0000EB49 66EF                <1> 	out	dx, ax
   305                              <1> 	;iretd
   306 0000EB4B EBDD                <1> 	jmp	short int34h_iret
   307                              <1> 
   308                              <1> int34h_4:
   309                              <1> 	; ah = 5
   310 0000EB4D 89D8                <1> 	mov	eax, ebx
   311 0000EB4F EF                  <1> 	out	dx, eax
   312                              <1> 	;iretd
   313 0000EB50 EBD8                <1> 	jmp	short int34h_iret
   314                              <1> 
   315                              <1> int34h_5:
   316 0000EB52 804C240801          <1> 	or	byte [esp+8], 1	; set carry bit of eflags register
   317 0000EB57 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 0000EB58 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 0000EB59 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   337                              <1> 	;push	eax
   338 0000EB5C 66B80900            <1> 	mov	ax, 9
   339 0000EB60 EB07                <1> 	jmp	short comm_int
   340                              <1> com1_int:
   341                              <1> 	; 07/11/2015
   342                              <1> 	; 24/10/2015
   343 0000EB62 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   344                              <1> 	; 23/10/2015
   345                              <1> 	;push	eax
   346 0000EB65 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 0000EB69 53                  <1> 	push	ebx
   360 0000EB6A 56                  <1> 	push	esi
   361 0000EB6B 57                  <1> 	push	edi
   362 0000EB6C 1E                  <1> 	push 	ds
   363 0000EB6D 06                  <1> 	push 	es
   364                              <1> 	; 18/11/2015
   365 0000EB6E 0F20DB              <1> 	mov	ebx, cr3
   366 0000EB71 53                  <1> 	push	ebx ; ****
   367                              <1> 	;
   368 0000EB72 51                  <1> 	push	ecx ; ***
   369 0000EB73 52                  <1> 	push	edx ; **
   370                              <1> 	;
   371 0000EB74 BB10000000          <1> 	mov	ebx, KDATA
   372 0000EB79 8EDB                <1> 	mov	ds, bx
   373 0000EB7B 8EC3                <1> 	mov	es, bx
   374                              <1> 	;
   375 0000EB7D 8B0D[A8330100]      <1> 	mov	ecx, [k_page_dir]
   376 0000EB83 0F22D9              <1> 	mov	cr3, ecx
   377                              <1> 	; 20/11/2015
   378                              <1> 	; Interrupt identification register
   379 0000EB86 66BAFA02            <1> 	mov	dx, 2FAh ; COM2
   380                              <1> 	;
   381 0000EB8A 3C08                <1> 	cmp 	al, 8 
   382 0000EB8C 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 0000EB8E FEC6                <1> 	inc	dh ; 3FAh ; COM1 Interrupt id. register
   394                              <1> com_i0:
   395                              <1> 	;push	eax ; *
   396                              <1> 	; 07/11/2015
   397 0000EB90 A2[12340100]        <1> 	mov 	byte [ccomport], al
   398                              <1> 	; 09/11/2015
   399 0000EB95 0FB7D8              <1> 	movzx	ebx, ax ; 8 or 9
   400                              <1> 	; 17/11/2015
   401                              <1>  	; reset request for response status
   402 0000EB98 88A3[08340100]      <1> 	mov	[ebx+req_resp-8], ah ; 0
   403                              <1> 	;
   404                              <1> 	; 20/11/2015
   405 0000EB9E EC                  <1> 	in	al, dx		; read interrupt id. register
   406 0000EB9F EB00                <1> 	JMP	$+2	   	; I/O DELAY
   407 0000EBA1 2404                <1> 	and	al, 4		; received data available?	
   408 0000EBA3 7470                <1> 	jz	short com_eoi	; (transmit. holding reg. empty)
   409                              <1> 	;
   410                              <1> 	; 20/11/2015
   411 0000EBA5 80EA02              <1> 	sub	dl, 3FAh-3F8h	; data register (3F8h, 2F8h)
   412 0000EBA8 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 0000EBA9 89DE                <1> 	mov	esi, ebx 
   417 0000EBAB 89DF                <1> 	mov	edi, ebx
   418 0000EBAD 81C6[0C340100]      <1> 	add 	esi, rchar - 8 ; points to last received char
   419 0000EBB3 81C7[0E340100]      <1> 	add	edi, schar - 8 ; points to last sent char
   420 0000EBB9 8806                <1> 	mov	[esi], al ; received char (current char)
   421                              <1> 	; query
   422 0000EBBB 20C0                <1> 	and	al, al
   423 0000EBBD 7527                <1> 	jnz	short com_i2
   424                              <1>    	; response
   425                              <1> 	; 17/11/2015
   426                              <1> 	; set request for response status
   427 0000EBBF FE83[08340100]      <1>         inc     byte [ebx+req_resp-8] ; 1 
   428                              <1> 	;
   429 0000EBC5 6683C205            <1> 	add	dx, 3FDh-3F8h	; (3FDh, 2FDh)
   430 0000EBC9 EC                  <1> 	in	al, dx	   	; read line status register 
   431 0000EBCA EB00                <1> 	JMP	$+2	   	; I/O DELAY
   432 0000EBCC 2420                <1> 	and	al, 20h	   	; transmitter holding reg. empty?
   433 0000EBCE 7445                <1> 	jz	short com_eoi 	; no
   434 0000EBD0 B0FF                <1> 	mov 	al, 0FFh   	; response			
   435 0000EBD2 6683EA05            <1> 	sub	dx, 3FDh-3F8h 	; data port (3F8h, 2F8h)
   436 0000EBD6 EE                  <1> 	out	dx, al	   	; send on serial port
   437                              <1> 	; 17/11/2015
   438 0000EBD7 803F00              <1> 	cmp 	byte [edi], 0   ; query ? (schar)
   439 0000EBDA 7502                <1> 	jne 	short com_i1    ; no
   440 0000EBDC 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 0000EBDE FE8B[08340100]      <1>         dec     byte [ebx+req_resp-8] ; 0 
   445 0000EBE4 EB2F                <1> 	jmp	short com_eoi
   446                              <1> com_i2:	
   447                              <1> 	; 08/11/2015
   448 0000EBE6 3CFF                <1> 	cmp 	al, 0FFh	; (response ?)
   449 0000EBE8 7417                <1> 	je	short com_i3	; (check for response signal)
   450                              <1> 	; 07/11/2015
   451 0000EBEA 3C04                <1> 	cmp	al, 04h	; EOT
   452 0000EBEC 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 0000EBEE 861D[D6330100]      <1> 	xchg	bl, [ptty]  ; tty number (8 or 9)
   458 0000EBF4 E8F170FFFF          <1> 	call 	ctrlbrk
   459 0000EBF9 861D[D6330100]      <1> 	xchg	[ptty], bl ; (restore ptty value and BL value)
   460                              <1> 	;mov	al, 04h ; EOT
   461                              <1> 	; 08/11/2015
   462 0000EBFF 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 0000EC01 803F00              <1>         cmp     byte [edi], 0 ; query ? (schar)
   469 0000EC04 7704                <1> 	ja	short com_i4 ; no
   470                              <1> 	; reset query status (schar)
   471 0000EC06 8807                <1> 	mov	[edi], al ; 0FFh
   472 0000EC08 FEC0                <1> 	inc	al ; 0
   473                              <1> com_i4:
   474                              <1> 	; 27/07/2014
   475                              <1> 	; 09/07/2014
   476 0000EC0A D0E3                <1> 	shl	bl, 1	
   477 0000EC0C 81C3[D8330100]      <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 0000EC12 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 0000EC15 A0[12340100]        <1> 	mov	al, byte [ccomport] ; current COM port
   491                              <1> 	 ; al = tty number (8 or 9)
   492 0000EC1A E85E010000          <1>         call	wakeup
   493                              <1> com_iret:
   494                              <1> 	; 23/10/2015
   495 0000EC1F 5A                  <1> 	pop	edx ; **
   496 0000EC20 59                  <1> 	pop	ecx ; ***
   497                              <1> 	; 18/11/2015
   498                              <1> 	;pop	eax ; ****
   499                              <1> 	;mov	cr3, eax
   500                              <1> 	;jmp	iiret
   501 0000EC21 E9AB1EFFFF          <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 0000EC26 BB[0E340100]        <1> 	mov	ebx, com1p		; COM1 parameters  
   567 0000EC2B 66BAF803            <1> 	mov	dx, 3F8h		; COM1
   568                              <1> 	 ; 29/10/2015
   569 0000EC2F 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   570 0000EC33 E86F000000          <1> 	call	sp_i3	; call A4	
   571 0000EC38 A880                <1> 	test	al, 80h
   572 0000EC3A 7410                <1> 	jz	short sp_i0 ; OK..
   573                              <1> 		; Error !
   574                              <1> 	;mov	dx, 3F8h
   575 0000EC3C 80EA05              <1> 	sub	dl, 5 ; 3FDh -> 3F8h
   576 0000EC3F 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   577 0000EC43 E85F000000          <1> 	call	sp_i3	; call A4	
   578 0000EC48 A880                <1> 	test	al, 80h
   579 0000EC4A 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 0000EC4C C603E3              <1> 	mov	byte [ebx], 0E3h ; 11100011b
   585 0000EC4F E8DC000000          <1> 	call	sp_i5 ; 29/06/2015
   586                              <1> sp_i1:
   587 0000EC54 43                  <1> 	inc	ebx
   588 0000EC55 66BAF802            <1> 	mov	dx, 2F8h		; COM2
   589                              <1> 	 ; 29/10/2015
   590 0000EC59 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   591 0000EC5D E845000000          <1> 	call	sp_i3	; call A4	
   592 0000EC62 A880                <1> 	test	al, 80h
   593 0000EC64 7410                <1> 	jz	short sp_i2 ; OK..
   594                              <1> 		; Error !
   595                              <1> 	;mov	dx, 2F8h
   596 0000EC66 80EA05              <1> 	sub	dl, 5 ; 2FDh -> 2F8h
   597 0000EC69 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   598 0000EC6D E835000000          <1> 	call	sp_i3	; call A4	
   599 0000EC72 A880                <1> 	test	al, 80h
   600 0000EC74 7530                <1> 	jnz	short sp_i7
   601                              <1> sp_i2:
   602 0000EC76 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 0000EC79 9C                  <1> 	pushf
   608 0000EC7A FA                  <1> 	cli
   609                              <1> 	;
   610 0000EC7B 66BAFC02            <1> 	mov	dx, 2FCh   		; modem control register
   611 0000EC7F EC                  <1> 	in	al, dx 	   		; read register
   612 0000EC80 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   613 0000EC82 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   614 0000EC84 EE                  <1> 	out	dx, al     		; write back to register
   615 0000EC85 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   616 0000EC87 66BAF902            <1> 	mov	dx, 2F9h   		; interrupt enable register
   617 0000EC8B EC                  <1> 	in	al, dx     		; read register
   618 0000EC8C EB00                <1> 	JMP	$+2	   		; I/O DELAY
   619                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   620 0000EC8E 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   621 0000EC90 EE                  <1> 	out	dx, al 	   		; write back to register
   622 0000EC91 EB00                <1> 	JMP	$+2        		; I/O DELAY
   623 0000EC93 E421                <1> 	in	al, 21h    		; read interrupt mask register
   624 0000EC95 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   625 0000EC97 24F7                <1> 	and	al, 0F7h   		; enable IRQ 3 (COM2)
   626 0000EC99 E621                <1> 	out	21h, al    		; write back to register
   627                              <1> 	;
   628                              <1> 	; 23/10/2015
   629 0000EC9B B8[59EB0000]        <1> 	mov 	eax, com2_int
   630 0000ECA0 A3[78ED0000]        <1> 	mov	[com2_irq3], eax
   631                              <1> 	; 26/10/2015
   632 0000ECA5 9D                  <1> 	popf	
   633                              <1> sp_i7:
   634 0000ECA6 C3                  <1> 	retn
   635                              <1> 
   636                              <1> sp_i3:
   637                              <1> ;A4:  	;-----	INITIALIZE THE COMMUNICATIONS PORT
   638                              <1> 	; 28/10/2015
   639 0000ECA7 FEC2                <1> 	inc	dl	; 3F9h (2F9h)	; 3F9h, COM1 Interrupt enable register 
   640 0000ECA9 B000                <1> 	mov	al, 0
   641 0000ECAB EE                  <1> 	out	dx, al			; disable serial port interrupt
   642 0000ECAC EB00                <1> 	JMP	$+2			; I/O DELAY
   643 0000ECAE 80C202              <1> 	add	dl, 2 	; 3FBh (2FBh)	; COM1 Line control register (3FBh)
   644 0000ECB1 B080                <1> 	mov	al, 80h			
   645 0000ECB3 EE                  <1> 	out	dx, al			; SET DLAB=1 ; divisor latch access bit
   646                              <1> 	;-----	SET BAUD RATE DIVISOR
   647                              <1> 	; 26/10/2015
   648 0000ECB4 80EA03              <1> 	sub 	dl, 3   ; 3F8h (2F8h)	; register for least significant byte
   649                              <1> 					; of the divisor value
   650 0000ECB7 88C8                <1> 	mov	al, cl	; 1
   651 0000ECB9 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 0000ECBA EB00                <1> 	JMP	$+2			; I/O DELAY
   657 0000ECBC 28C0                <1> 	sub	al, al
   658 0000ECBE FEC2                <1> 	inc	dl      ; 3F9h (2F9h)	; register for most significant byte
   659                              <1> 					; of the divisor value
   660 0000ECC0 EE                  <1> 	out	dx, al ; 0
   661 0000ECC1 EB00                <1> 	JMP	$+2			; I/O DELAY
   662                              <1> 	;	
   663 0000ECC3 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 0000ECC5 80C202              <1> 	add	dl, 2	; 3FBh (2FBh)	; Line control register
   666 0000ECC8 EE                  <1> 	out	dx, al			
   667 0000ECC9 EB00                <1> 	JMP	$+2			; I/O DELAY
   668                              <1> 	; 29/10/2015
   669 0000ECCB FECA                <1> 	dec 	dl 	; 3FAh (2FAh)	; FIFO Control register (16550/16750)
   670 0000ECCD 30C0                <1> 	xor	al, al			; 0
   671 0000ECCF EE                  <1> 	out	dx, al			; Disable FIFOs (reset to 8250 mode)
   672 0000ECD0 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 0000ECD2 80C204              <1> 	add	dl, 4	; 3FEh (2FEh)	; Modem status register
   677                              <1> sp_i4s:
   678 0000ECD5 EC                  <1> 	in	al, dx			; GET MODEM CONTROL STATUS
   679 0000ECD6 EB00                <1> 	JMP	$+2			; I/O DELAY
   680 0000ECD8 88C4                <1> 	mov	ah, al			; PUT IN (AH) FOR RETURN
   681 0000ECDA FECA                <1> 	dec	dl	; 3FDh (2FDh)	; POINT TO LINE STATUS REGISTER
   682                              <1> 					; dx = 3FDh for COM1, 2FDh for COM2
   683 0000ECDC EC                  <1> 	in	al, dx			; GET LINE CONTROL STATUS
   684                              <1> 	; AL = Line status, AH = Modem status
   685 0000ECDD 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 0000ECDE 66BAFE03            <1> 	mov	dx, 3FEh		; Modem status register (COM1)
   692 0000ECE2 28C6                <1> 	sub	dh, al			; dh = 2 for COM2 (al = 1)
   693                              <1> 					; dx = 2FEh for COM2
   694 0000ECE4 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 0000ECE6 66BAF803            <1> 	mov	dx, 3F8h
   739 0000ECEA BB[0E340100]        <1> 	mov	ebx, com1p ; COM1 control byte offset
   740 0000ECEF 3C01                <1> 	cmp	al, 1
   741 0000ECF1 776B                <1> 	ja 	short sp_invp_err
   742 0000ECF3 7203                <1> 	jb	short sp_setp1 ;  COM1 (AL = 0)
   743 0000ECF5 FECE                <1> 	dec	dh ; 2F8h
   744 0000ECF7 43                  <1> 	inc	ebx ; COM2 control byte offset
   745                              <1> sp_setp1:
   746                              <1> 	; 29/10/2015
   747 0000ECF8 8823                <1> 	mov	[ebx], ah
   748 0000ECFA 0FB6CC              <1> 	movzx 	ecx, ah
   749 0000ECFD C0E905              <1> 	shr	cl, 5 ; -> baud rate index
   750 0000ED00 80E41F              <1> 	and	ah, 1Fh ; communication parameters except baud rate
   751 0000ED03 8A81[6DED0000]      <1> 	mov	al, [ecx+b_div_tbl]
   752 0000ED09 6689C1              <1> 	mov	cx, ax
   753 0000ED0C E896FFFFFF          <1> 	call	sp_i3
   754 0000ED11 6689C1              <1> 	mov	cx, ax ; CL = Line status, CH = Modem status
   755 0000ED14 A880                <1> 	test	al, 80h
   756 0000ED16 740F                <1> 	jz	short sp_setp2
   757 0000ED18 C603E3              <1>         mov     byte [ebx], 0E3h ; Reset to initial value (11100011b)
   758                              <1> stp_dnr_err:
   759 0000ED1B C705[484A0100]0F00- <1> 	mov	dword [u.error], ERR_DEV_NOT_RDY ; 'device not ready !'
   759 0000ED23 0000                <1>
   760                              <1> 	; CL = Line status, CH = Modem status
   761 0000ED25 F9                  <1> 	stc
   762 0000ED26 C3                  <1> 	retn
   763                              <1> sp_setp2:
   764 0000ED27 80FE02              <1> 	cmp	dh, 2 ; COM2 (2F?h)
   765 0000ED2A 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 0000ED30 9C                  <1> 	pushf
   774 0000ED31 FA                  <1> 	cli
   775 0000ED32 66BAFC03            <1> 	mov	dx, 3FCh   		; modem control register
   776 0000ED36 EC                  <1> 	in	al, dx 	   		; read register
   777 0000ED37 EB00                <1> 	JMP	$+2			; I/O DELAY
   778 0000ED39 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   779 0000ED3B EE                  <1> 	out	dx, al     		; write back to register
   780 0000ED3C EB00                <1> 	JMP	$+2			; I/O DELAY
   781 0000ED3E 66BAF903            <1> 	mov	dx, 3F9h   		; interrupt enable register
   782 0000ED42 EC                  <1> 	in	al, dx     		; read register
   783 0000ED43 EB00                <1> 	JMP	$+2			; I/O DELAY
   784                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   785 0000ED45 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   786 0000ED47 EE                  <1> 	out	dx, al 	   		; write back to register
   787 0000ED48 EB00                <1> 	JMP	$+2        		; I/O DELAY
   788 0000ED4A E421                <1> 	in	al, 21h    		; read interrupt mask register
   789 0000ED4C EB00                <1> 	JMP	$+2			; I/O DELAY
   790 0000ED4E 24EF                <1> 	and	al, 0EFh   		; enable IRQ 4 (COM1)
   791 0000ED50 E621                <1> 	out	21h, al    		; write back to register
   792                              <1> 	;
   793                              <1> 	; 23/10/2015
   794 0000ED52 B8[62EB0000]        <1> 	mov 	eax, com1_int
   795 0000ED57 A3[74ED0000]        <1> 	mov	[com1_irq4], eax
   796                              <1> 	; 26/10/2015
   797 0000ED5C 9D                  <1> 	popf
   798 0000ED5D C3                  <1> 	retn
   799                              <1> 
   800                              <1> sp_invp_err:
   801 0000ED5E C705[484A0100]1700- <1> 	mov	dword [u.error], ERR_INV_PARAMETER ; 'invalid parameter !' 
   801 0000ED66 0000                <1>
   802 0000ED68 31C9                <1> 	xor	ecx, ecx
   803 0000ED6A 49                  <1> 	dec	ecx ; 0FFFFh
   804 0000ED6B F9                  <1> 	stc
   805 0000ED6C C3                  <1> 	retn
   806                              <1> 
   807                              <1> ; 29/10/2015
   808                              <1> b_div_tbl: ; Baud rate divisor table (115200/divisor)
   809 0000ED6D 010C0603080401      <1> 	db 1, 12, 6, 3, 8, 4, 1
   810                              <1> 
   811                              <1> 
   812                              <1> ; 23/10/2015
   813                              <1> com1_irq4:
   814 0000ED74 [7CED0000]          <1> 	dd dummy_retn
   815                              <1> com2_irq3:
   816 0000ED78 [7CED0000]          <1> 	dd dummy_retn
   817                              <1> 
   818                              <1> dummy_retn:
   819 0000ED7C C3                  <1> 	retn
   820                              <1> 
   821                              <1> wakeup:
   822                              <1> 	; 24/01/2016
   823 0000ED7D C3                  <1> 	retn
   824                              <1> 
   825                              <1> set_working_path_x:
   826                              <1> 		; 17/10/2016 (TRDOS 386 - FFF & FNF)
   827 0000ED7E 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 0000ED82 8825[60410100]      <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 0000ED88 66A3[64410100]      <1> 		mov	[SWP_Mode], ax
   887 0000ED8E A0[6E340100]        <1> 		mov	al, [Current_Drv]
   888 0000ED93 30E4                <1> 		xor	ah, ah
   889 0000ED95 66A3[66410100]      <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 0000ED9B 55                  <1> 		push	ebp
   896 0000ED9C 89E5                <1> 		mov	ebp, esp
   897                              <1> 		
   898 0000ED9E B980000000          <1> 		mov	ecx, 128 ; maximum path length = 128 bytes
   899 0000EDA3 29CC                <1> 		sub	esp, ecx ; reserve 128 bytes (buffer) on stack
   900 0000EDA5 89E7                <1> 		mov	edi, esp ; destination address (kernel space)
   901                              <1> 		; esi = source address (virtual, in user's memory space)
   902 0000EDA7 E83EF3FFFF          <1> 		call	transfer_from_user_buffer
   903 0000EDAC 720A                <1> 		jc	short loc_swp_xor_retn 
   904                              <1> 		
   905 0000EDAE 89E6                <1> 		mov	esi, esp ; temporary buffer (the path) on stack
   906                              <1> loc_swp_fchar:
   907 0000EDB0 8A06                <1> 		mov	al, [esi]
   908 0000EDB2 3C20                <1> 		cmp	al, 20h
   909 0000EDB4 7711                <1> 		ja	short loc_swp_parse_path_name
   910 0000EDB6 740C                <1> 		je	short loc_swp_fchar_next
   911                              <1> 
   912                              <1> loc_swp_xor_retn:
   913 0000EDB8 31C0                <1> 		xor	eax, eax
   914 0000EDBA F9                  <1> 		stc
   915                              <1> loc_swp_retn:
   916 0000EDBB 89EC                <1> 		mov	esp, ebp
   917 0000EDBD 5D                  <1> 		pop	ebp
   918                              <1> 
   919                              <1> 		;mov	esi, FindFile_Drv
   920 0000EDBE BE[543E0100]        <1> 		mov	esi, FindFile_Name ; 12/10/2016
   921 0000EDC3 C3                  <1> 		retn 
   922                              <1> 
   923                              <1> loc_swp_fchar_next:
   924 0000EDC4 46                  <1> 		inc	esi
   925 0000EDC5 EBE9                <1> 		jmp	short loc_swp_fchar  
   926                              <1> 
   927                              <1> loc_swp_parse_path_name:
   928 0000EDC7 BF[123E0100]        <1> 		mov	edi, FindFile_Drv
   929 0000EDCC E849ADFFFF          <1> 		call	parse_path_name
   930 0000EDD1 72E8                <1> 		jc	short loc_swp_retn
   931                              <1> 
   932                              <1> loc_swp_checkfile_name:
   933 0000EDD3 803D[64410100]00    <1> 		cmp	byte [SWP_Mode], 0
   934 0000EDDA 761E                <1> 		jna	short loc_swp_drv
   935                              <1> 
   936                              <1> 		; 10/10/2016 (valid file name checking)
   937 0000EDDC BE[543E0100]        <1> 		mov	esi, FindFile_Name
   938 0000EDE1 803E20              <1> 		cmp	byte [esi], 20h
   939 0000EDE4 76D2                <1> 		jna	short loc_swp_xor_retn
   940                              <1> 
   941                              <1> 		; 16/10/2016
   942 0000EDE6 C605[63410100]00    <1> 		mov	byte [SWP_inv_fname], 0 ; reset 
   943                              <1> 		; esi = file name address (ASCIIZ)
   944 0000EDED E8D18EFFFF          <1> 		call	check_filename
   945 0000EDF2 7306                <1> 		jnc	short loc_swp_drv
   946                              <1> 
   947 0000EDF4 FE05[63410100]      <1> 		inc	byte [SWP_inv_fname] ; set 	
   948                              <1> loc_swp_drv:
   949 0000EDFA 8A35[6E340100]      <1> 		mov	dh, [Current_Drv]
   950                              <1>                ;mov	[RUN_CDRV], dh
   951                              <1> 
   952 0000EE00 8A15[123E0100]      <1> 		mov	dl, [FindFile_Drv]
   953                              <1>                ;cmp	dl, dh
   954 0000EE06 3A15[6E340100]      <1> 		cmp	dl, [Current_Drv]
   955 0000EE0C 740D                <1> 		je	short loc_swp_change_directory
   956                              <1> 
   957 0000EE0E FE05[67410100]      <1> 		inc	byte [SWP_DRV_chg]
   958 0000EE14 E85877FFFF          <1> 		call	change_current_drive
   959 0000EE19 72A0                <1> 		jc	short loc_swp_retn ; eax = error code
   960                              <1> 		; eax = 0
   961                              <1> 
   962                              <1> loc_swp_change_directory:
   963 0000EE1B 803D[133E0100]21    <1> 		cmp	byte [FindFile_Directory], 21h
   964 0000EE22 F5                  <1> 		cmc
   965 0000EE23 7396                <1> 		jnc	short loc_swp_retn
   966                              <1> 
   967 0000EE25 FE05[67410100]      <1> 		inc	byte [SWP_DRV_chg]
   968 0000EE2B FE05[15F00000]      <1> 		inc	byte [Restore_CDIR]
   969 0000EE31 BE[133E0100]        <1> 		mov	esi, FindFile_Directory
   970 0000EE36 8A25[65410100]      <1> 		mov	ah, [SWP_Mode+1] 
   971 0000EE3C E8C5A6FFFF          <1> 		call	change_current_directory
   972 0000EE41 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 0000EE47 E8DFA5FFFF          <1> 		call	change_prompt_dir_str 
   979 0000EE4C 29C0                <1> 		sub	eax, eax ; 0
   980 0000EE4E 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 0000EE53 31C0                <1> 		xor	eax, eax
  1000 0000EE55 48                  <1> 		dec	eax 
  1001                              <1> 
  1002 0000EE56 668B15[66410100]    <1> 		mov	dx, [SWP_DRV]
  1003 0000EE5D 08F6                <1> 		or	dh, dh
  1004 0000EE5F 742E                <1> 		jz	short loc_rwp_return
  1005                              <1> 
  1006 0000EE61 3A15[6E340100]      <1> 		cmp	dl, [Current_Drv]
  1007 0000EE67 7407                <1> 		je	short loc_rwp_restore_cdir
  1008                              <1> loc_rwp_restore_cdrv:
  1009 0000EE69 E80377FFFF          <1> 		call	change_current_drive 
  1010 0000EE6E EB10                <1> 		jmp	short loc_rwp_restore_ok
  1011                              <1> loc_rwp_restore_cdir:
  1012 0000EE70 31DB                <1> 		xor	ebx, ebx
  1013 0000EE72 88D7                <1> 		mov	bh, dl
  1014 0000EE74 BE00010900          <1> 		mov	esi, Logical_DOSDisks
  1015 0000EE79 01DE                <1> 		add	esi, ebx
  1016                              <1> 
  1017 0000EE7B E8A877FFFF          <1> 		call	restore_current_directory
  1018                              <1> 
  1019                              <1> loc_rwp_restore_ok:
  1020 0000EE80 668B15[66410100]    <1> 		mov	dx, [SWP_DRV]
  1021 0000EE87 31C0                <1> 		xor	eax, eax  
  1022 0000EE89 66A3[67410100]      <1> 		mov	[SWP_DRV_chg], ax
  1023                              <1> loc_rwp_return:
  1024 0000EE8F 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 0000EE90 57                  <1> 		push	edi
  1054 0000EE91 56                  <1> 		push	esi
  1055 0000EE92 AC                  <1> 		lodsb
  1056 0000EE93 3C20                <1> 		cmp	al, 20h
  1057 0000EE95 762A                <1> 		jna	short pass_gfn_ext
  1058 0000EE97 56                  <1> 		push	esi
  1059 0000EE98 AA                  <1> 		stosb
  1060 0000EE99 B907000000          <1> 		mov	ecx, 7
  1061                              <1> loc_gfn_next_char:
  1062 0000EE9E AC                  <1> 		lodsb
  1063 0000EE9F 3C20                <1> 		cmp	al, 20h
  1064 0000EEA1 7603                <1> 		jna	short pass_gfn_fn
  1065 0000EEA3 AA                  <1> 		stosb
  1066 0000EEA4 E2F8                <1> 		loop	loc_gfn_next_char
  1067                              <1> pass_gfn_fn:
  1068 0000EEA6 5E                  <1> 		pop	esi
  1069 0000EEA7 83C607              <1> 		add	esi, 7
  1070 0000EEAA AC                  <1> 		lodsb
  1071 0000EEAB 3C20                <1> 		cmp	al, 20h
  1072 0000EEAD 7612                <1> 		jna	short pass_gfn_ext
  1073 0000EEAF B42E                <1> 		mov	ah, '.'
  1074 0000EEB1 86E0                <1> 		xchg	ah, al
  1075 0000EEB3 66AB                <1> 		stosw
  1076 0000EEB5 AC                  <1> 		lodsb
  1077 0000EEB6 3C20                <1> 		cmp	al, 20h
  1078 0000EEB8 7607                <1> 		jna	short pass_gfn_ext
  1079 0000EEBA AA                  <1> 		stosb
  1080 0000EEBB AC                  <1> 		lodsb
  1081 0000EEBC 3C20                <1> 		cmp	al, 20h
  1082 0000EEBE 7601                <1> 		jna	short pass_gfn_ext
  1083 0000EEC0 AA                  <1> 		stosb
  1084                              <1> pass_gfn_ext:		
  1085 0000EEC1 30C0                <1> 		xor	al, al
  1086 0000EEC3 AA                  <1> 		stosb
  1087 0000EEC4 5E                  <1> 		pop	esi
  1088 0000EEC5 5F                  <1> 		pop	edi
  1089 0000EEC6 C3                  <1> 		retn
  1090                              <1> 
  1091                              <1> get_device_number:
  1092                              <1> 		; 08/10/2016
  1093                              <1> 		; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1094                              <1> 		;
  1095                              <1> 		; This procedure compares name of requested
  1096                              <1> 		; device with kernel device names and
  1097                              <1> 		; installable device names. If names match, 
  1098                              <1> 		; the relevant device index (entry) number 
  1099                              <1> 		; will be returned the caller (sysopen) 
  1100                              <1> 		; for the requested device.
  1101                              <1> 		;
  1102                              <1> 		; NOTE: Installable device drivers must
  1103                              <1> 		; be loaded before using 'sysopen'
  1104                              <1> 		; (opendev) system call.
  1105                              <1> 		;
  1106                              <1> 		; INPUT:
  1107                              <1> 		;    ESI = device name address (ASCIIZ)
  1108                              <1> 		;         (in kernel's memory space)  
  1109                              <1>    		;    max name length = 8 without '/dev/')
  1110                              <1> 		;    Device name will be capitalized 
  1111                              <1> 		;    and if there is, '/dev/' will be
  1112                              <1> 		;    removed from name before comparising)
  1113                              <1> 		;
  1114                              <1> 		; OUTPUT:
  1115                              <1> 		;    cf = 0 -> 
  1116                              <1> 		;      EAX (AL) = device entry/index number 	 	
  1117                              <1> 		;    cf = 1 -> device not found (installed)
  1118                              <1> 		;	       or invalid device name
  1119                              <1> 		;	       (AL=0)
  1120                              <1> 		;    device_name = device name address (asciiz)
  1121                              <1> 			;
  1122                              <1> 		; Modified registers: EAX, EBX, ESI, EDI
  1123                              <1> 
  1124 0000EEC7 BF[68410100]        <1> 		mov	edi, device_name
  1125 0000EECC E805010000          <1> 		call 	lodsb_capitalize
  1126 0000EED1 88C4                <1> 		mov	ah, al
  1127 0000EED3 3C2F                <1> 		cmp	al, '/'
  1128 0000EED5 750E                <1> 		jne	short gdn_1
  1129 0000EED7 BF[68410100]        <1> 		mov	edi, device_name
  1130 0000EEDC E8F5000000          <1> 		call 	lodsb_capitalize
  1131                              <1> gdn_0:
  1132 0000EEE1 20C0                <1> 		and	al, al ; 0 ?
  1133 0000EEE3 7420                <1> 		jz	short gdn_err ; null name after '/'
  1134                              <1> gdn_1:
  1135 0000EEE5 3C44                <1> 		cmp	al, 'D'
  1136 0000EEE7 7517                <1> 		jne	short gdn_2
  1137 0000EEE9 E8E8000000          <1> 		call 	lodsb_capitalize
  1138 0000EEEE 3C45                <1> 		cmp	al, 'E'
  1139 0000EEF0 750E                <1> 		jne	short gdn_2
  1140 0000EEF2 E8DF000000          <1> 		call 	lodsb_capitalize
  1141 0000EEF7 3C56                <1> 		cmp	al, 'V'
  1142 0000EEF9 7505                <1> 		jne	short gdn_2			
  1143 0000EEFB AC                  <1> 		lodsb
  1144 0000EEFC 3C2F                <1> 		cmp	al, '/'
  1145 0000EEFE 740D                <1> 		je	short gdn_4
  1146                              <1> gdn_2:
  1147 0000EF00 80FC2F              <1> 		cmp	ah, '/'
  1148 0000EF03 750F                <1> 		jne	short gdn_5
  1149                              <1> gdn_err:		
  1150                              <1> 		; invalid device name or device not found
  1151 0000EF05 31C0                <1> 		xor	eax, eax ; 0
  1152 0000EF07 F9                  <1> 		stc
  1153 0000EF08 C3                  <1> 		retn
  1154                              <1> gdn_3:
  1155 0000EF09 3C2F                <1> 		cmp	al, '/'
  1156 0000EF0B 7507                <1> 		jne	short gdn_5
  1157                              <1> gdn_4:
  1158 0000EF0D BF[68410100]        <1> 		mov	edi, device_name
  1159 0000EF12 EB04                <1> 		jmp	short gdn_6
  1160                              <1> gdn_5:
  1161 0000EF14 3C00                <1> 		cmp	al, 0
  1162 0000EF16 7419                <1> 		je	short gdn_7
  1163                              <1> gdn_6:
  1164 0000EF18 E8B9000000          <1> 		call lodsb_capitalize
  1165 0000EF1D 81FF[70410100]      <1> 		cmp	edi, device_name + 8
  1166 0000EF23 72E4                <1> 		jb	short gdn_3
  1167 0000EF25 3C00                <1> 		cmp	al, 0
  1168 0000EF27 75DC                <1> 		jne	short gdn_err
  1169 0000EF29 81FF[69410100]      <1> 		cmp	edi, device_name + 1
  1170 0000EF2F 76D4                <1> 		jna	short gdn_err ; null name after '/'
  1171                              <1> gdn_7:
  1172 0000EF31 AA                  <1> 		stosb
  1173                              <1> 		; zero padding ("NAME",0,0,0,0)
  1174 0000EF32 81FF[70410100]      <1> 		cmp	edi, device_name + 8
  1175 0000EF38 72F7                <1> 		jb	short gdn_7
  1176                              <1> gdn_8:
  1177                              <1> 		; search for kernel device names
  1178 0000EF3A BE[68410100]        <1> 		mov	esi, device_name 
  1179 0000EF3F BF[30F70000]        <1> 		mov	edi, KDEV_NAME
  1180 0000EF44 31C0                <1> 		xor	eax, eax
  1181                              <1> gdn_9:
  1182 0000EF46 A7                  <1> 		cmpsd	
  1183 0000EF47 7505                <1> 		jne	short gdn_10
  1184 0000EF49 A7                  <1> 		cmpsd
  1185 0000EF4A 7503                <1> 		jne	short gdn_11
  1186 0000EF4C EB2B                <1> 		jmp	short gdn_17 ; match
  1187                              <1> gdn_10:
  1188 0000EF4E A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1189                              <1> gdn_11:
  1190 0000EF4F BE[68410100]        <1> 		mov	esi, device_name
  1191 0000EF54 FEC0                <1> 		inc	al
  1192 0000EF56 3C16                <1> 		cmp	al, NumOfKernelDevNames
  1193 0000EF58 72EC                <1> 		jb	short gdn_9
  1194                              <1> gdn_12:
  1195                              <1> 		; search for installable device names
  1196                              <1> 		; esi = offset device_name 
  1197 0000EF5A BF[94410100]        <1> 		mov	edi, IDEV_NAME
  1198 0000EF5F 28C0                <1> 		sub	al, al ; 0
  1199                              <1> gdn_13:
  1200 0000EF61 A7                  <1> 		cmpsd	
  1201 0000EF62 7505                <1> 		jne	short gdn_14
  1202 0000EF64 A7                  <1> 		cmpsd
  1203 0000EF65 7503                <1> 		jne	short gdn_15
  1204 0000EF67 EB3F                <1> 		jmp	short gdn_19 ; match
  1205                              <1> gdn_14:
  1206 0000EF69 A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1207                              <1> gdn_15:
  1208 0000EF6A BE[68410100]        <1> 		mov	esi, device_name
  1209 0000EF6F FEC0                <1> 		inc	al
  1210 0000EF71 3C08                <1> 		cmp	al, NumOfInstallableDevices
  1211 0000EF73 72EC                <1> 		jb	short gdn_13
  1212                              <1> 
  1213                              <1> gdn_16: 	; error: invalid device name (not found) !
  1214 0000EF75 30C0                <1> 		xor	al, al
  1215 0000EF77 F9                  <1> 		stc
  1216 0000EF78 C3                  <1> 		retn
  1217                              <1> 
  1218                              <1> gdn_17:		; name match (with one of kernel device names)
  1219                              <1> 		;
  1220                              <1> 		; convert KDEV_NAME index to 
  1221                              <1> 		; KDEV_NUMBER index
  1222                              <1> 		; (different names are used for same devices)
  1223                              <1> 		; (example: "COM1" & "TTY8" = device number 18) 
  1224 0000EF79 89C3                <1> 		mov	ebx, eax ; < 256
  1225 0000EF7B 8A83[E0F70000]      <1> 		mov	al, [KDEV_NUMBER+ebx]
  1226                              <1> 
  1227                              <1> 		; check if empty dev entry in the list
  1228 0000EF81 80B8[18430100]00    <1> 		cmp	byte [DEV_OPENMODE+eax], 0
  1229 0000EF88 771B                <1> 		ja	short gdn_18 ; it must be already set
  1230                              <1> 
  1231                              <1> 		; (re)set device name and access flags
  1232                              <1> 		; (remain open work will be easy after that)
  1233                              <1> 		; (NOTE: here, data will be copied to bss section)
  1234 0000EF8A 88C3                <1> 		mov	bl, al
  1235 0000EF8C 83EF08              <1> 		sub	edi, 8 ; kernel device name address (data)
  1236 0000EF8F 66C1E302            <1> 		shl	bx, 2 
  1237 0000EF93 89BB[36430100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1238 0000EF99 8A98[36F90000]      <1> 		mov	bl, [KDEV_ACCESS+eax] ; kernel dev list (data)
  1239 0000EF9F 8898[64420100]      <1> 		mov	[DEV_ACCESS+eax], bl ; (all) device list (bss)
  1240                              <1> gdn_18:
  1241 0000EFA5 FEC0                <1> 		inc	al ; 1 to NumOfKernelDevNames (<=7Fh)
  1242                              <1> 		; eax = device index/entry number
  1243 0000EFA7 C3                  <1> 		retn		
  1244                              <1> 
  1245                              <1> gdn_19:		; name match (with one of installable device names)
  1246                              <1> 		;
  1247                              <1> 		; al = 0 to NumOfInstallableDevices - 1 (<=7Fh)
  1248                              <1> 
  1249 0000EFA8 89C3                <1> 		mov	ebx, eax
  1250 0000EFAA 80C316              <1> 		add	bl, NumOfKernelDevices 	; < NUMOFDEVICES	
  1251                              <1> 
  1252                              <1> 		; check if empty dev entry in the list
  1253 0000EFAD 80BB[18430100]00    <1> 		cmp	byte [DEV_OPENMODE+ebx], 0
  1254 0000EFB4 771D                <1> 		ja	short gdn_20 ; it must be already set
  1255                              <1> 
  1256                              <1> 		; (re)set device name and access flags
  1257                              <1> 		; (remain open work will be easy after that)
  1258 0000EFB6 83EF08              <1> 		sub	edi, 8 ; installable device name address
  1259 0000EFB9 66C1E302            <1> 		shl	bx, 2 ;*4
  1260 0000EFBD 89BB[36430100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1261 0000EFC3 66C1EB02            <1> 		shr	bx, 2
  1262 0000EFC7 8A80[DC410100]      <1> 		mov	al, [IDEV_FLAGS+eax] ; installable dev list
  1263 0000EFCD 8883[64420100]      <1> 		mov	[DEV_ACCESS+ebx], al ; (all) device list
  1264                              <1> gdn_20:	
  1265 0000EFD3 88D8                <1> 		mov	al, bl
  1266                              <1> 		; eax = device index/entry number ; < NUMOFDEVICES  
  1267 0000EFD5 C3                  <1> 		retn
  1268                              <1> 
  1269                              <1> lodsb_capitalize:
  1270                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1271                              <1> 	; INPUT -> [esi] = character
  1272                              <1> 	;          edi = destination
  1273                              <1> 	; OUTPUT -> AL contains capitalized character
  1274                              <1> 	;	   esi = esi+1
  1275                              <1> 	;	   edi = edi+1	
  1276                              <1> 	; 
  1277 0000EFD6 AC                  <1> 	lodsb	
  1278 0000EFD7 3C61                <1> 	cmp al, 61h
  1279 0000EFD9 7206                <1>      	jb  short lodsb_cap_retn
  1280 0000EFDB 3C7A                <1>      	cmp al, 7Ah
  1281 0000EFDD 7702                <1>      	ja  short lodsb_cap_retn
  1282 0000EFDF 24DF                <1>      	and al, 0DFh
  1283                              <1> lodsb_cap_retn:
  1284 0000EFE1 AA                  <1> 	stosb
  1285 0000EFE2 C3                  <1> 	retn
  1286                              <1> 
  1287                              <1> device_open:
  1288                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1289                              <1> 	; Complete device opening work for sysopen (device)
  1290                              <1> 	;
  1291                              <1> 	; INPUT -> 
  1292                              <1> 	;	EAX = Device Number (AL)
  1293                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1294                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1295                              <1> 	; OUTPUT ->
  1296                              <1> 	;	EAX = Device Number	
  1297                              <1> 	;	CF = 0 -> device has been opened
  1298                              <1> 	;	CF = 1 -> device could not be opened
  1299                              <1> 	;
  1300                              <1> 	;  Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1301                              <1> 	;
  1302                              <1> 
  1303 0000EFE3 89C3                <1> 	mov	ebx, eax
  1304 0000EFE5 66C1E302            <1> 	shl	bx, 2 ; *4
  1305                              <1> 
  1306 0000EFE9 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1307 0000EFEC 7406                <1> 	jz	short d_open_2 ; Kernel device
  1308                              <1> 	; installable device
  1309                              <1> d_open_1:
  1310 0000EFEE FFA3[E0410100]      <1>         jmp	dword [ebx+IDEV_OADDR-4]
  1311                              <1> d_open_2:
  1312 0000EFF4 FFA3[F2F70000]      <1> 	jmp	dword [ebx+KDEV_OADDR-4]
  1313                              <1> 
  1314                              <1> device_close:
  1315                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1316                              <1> 	; Complete device closing work for sysclose (device)
  1317                              <1> 	;
  1318                              <1> 	; INPUT -> 
  1319                              <1> 	;	EAX = Device Number (AL)
  1320                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1321                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1322                              <1> 	; OUTPUT ->
  1323                              <1> 	;	EAX = Device Number	
  1324                              <1> 	;	CF = 0 -> device has been closed
  1325                              <1> 	;	CF = 1 -> device could not be closed
  1326                              <1> 	;
  1327                              <1> 	; Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1328                              <1> 	;
  1329                              <1> 
  1330 0000EFFA 89C3                <1> 	mov	ebx, eax
  1331 0000EFFC 66C1E302            <1> 	shl	bx, 2 ; *4
  1332                              <1> 
  1333 0000F000 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1334 0000F003 7406                <1> 	jz	short d_close_2 ; Kernel device
  1335                              <1> 	; installable device
  1336                              <1> d_close_1:
  1337 0000F005 FFA3[00420100]      <1>         jmp	dword [ebx+IDEV_CADDR-4]
  1338                              <1> d_close_2:
  1339 0000F00B FFA3[42F80000]      <1> 	jmp	dword [ebx+KDEV_CADDR-4]	
  1340                              <1> 
  1341                              <1> rnull:
  1342                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1343                              <1> 	; read null (read from null device)
  1344 0000F011 C3                  <1> 	retn
  1345                              <1> 
  1346                              <1> wnull:
  1347                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1348                              <1> 	; write null (write to null device)
  1349 0000F012 C3                  <1> 	retn
  1350                              <1> 
  1351                              <1> otty:
  1352                              <1> sret:
  1353                              <1> ocvt:
  1354                              <1> ctty:
  1355                              <1> cret:
  1356                              <1> ccvt:
  1357                              <1> rtty:
  1358                              <1> wtty:
  1359                              <1> rmem:
  1360                              <1> wmem:
  1361                              <1> rfd:
  1362                              <1> rhd:
  1363                              <1> wfd:
  1364                              <1> whd:
  1365                              <1> rlpt:
  1366                              <1> wlpt:
  1367                              <1> rcvt:
  1368                              <1> xmtt:
  1369 0000F013 C3                  <1> 	retn
  2162                                  %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: 20/02/2017
     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 0000F014 01                  <1> 		db 1 ; A: = 0 & B: = 1
    22                              <1> 
    23                              <1> Restore_CDIR:	
    24 0000F015 FF                  <1> 		db 0FFh ; Initial value -> any number except 0
    25                              <1> 
    26                              <1> msg_CRLF_temp:  
    27 0000F016 070D0A00            <1> 		db  07h, 0Dh, 0Ah, 0
    28                              <1> 
    29                              <1> Magic_Bytes:
    30 0000F01A 04                  <1> 		db 4
    31 0000F01B 01                  <1> 		db 1
    32                              <1> mainprog_Version:
    33 0000F01C 07                  <1> 		db 7
    34 0000F01D 5B5452444F535D204D- <1> 		db "[TRDOS] Main Program v2.0.200217"
    34 0000F026 61696E2050726F6772- <1>
    34 0000F02F 616D2076322E302E32- <1>
    34 0000F038 3030323137          <1>
    35 0000F03D 0D0A                <1> 		db 0Dh, 0Ah
    36 0000F03F 286329204572646F67- <1> 		db "(c) Erdogan Tan 2005-2017"
    36 0000F048 616E2054616E203230- <1>
    36 0000F051 30352D32303137      <1>
    37 0000F058 0D0A00              <1> 		db 0Dh, 0Ah, 0
    38                              <1> 
    39                              <1> MainProgCfgFile: ; 14/04/2016
    40 0000F05B 4D41494E50524F472E- <1> 		db "MAINPROG.CFG", 0
    40 0000F064 43464700            <1>
    41                              <1> 
    42                              <1> TRDOSPromptLabel:
    43 0000F068 5452444F53          <1> 		db "TRDOS"
    44 0000F06D 00                  <1> 		db 0
    45 0000F06E 00<rept>            <1>                 times 5 db 0
    46 0000F073 00                  <1> 		db 0
    47                              <1> 
    48                              <1> ; INTERNAL COMMANDS
    49                              <1> Command_List:
    50 0000F074 44495200            <1> Cmd_Dir:	db "DIR", 0
    51 0000F078 434400              <1> Cmd_Cd:		db "CD", 0
    52 0000F07B 433A00              <1> Cmd_Drive:	db "C:", 0
    53 0000F07E 56455200            <1> Cmd_Ver:	db "VER", 0
    54 0000F082 4558495400          <1> Cmd_Exit:	db "EXIT", 0
    55 0000F087 50524F4D505400      <1> Cmd_Prompt:	db "PROMPT", 0
    56 0000F08E 564F4C554D4500      <1> Cmd_Volume:	db "VOLUME", 0
    57 0000F095 4C4F4E474E414D4500  <1> Cmd_LongName:	db "LONGNAME", 0
    58 0000F09E 4441544500          <1> Cmd_Date:	db "DATE", 0
    59 0000F0A3 54494D4500          <1> Cmd_Time:	db "TIME", 0
    60 0000F0A8 52554E00            <1> Cmd_Run:	db "RUN", 0
    61 0000F0AC 53455400            <1> Cmd_Set:	db "SET", 0 
    62 0000F0B0 434C5300            <1> Cmd_Cls:	db "CLS", 0
    63 0000F0B4 53484F5700          <1> Cmd_Show:	db "SHOW", 0
    64 0000F0B9 44454C00            <1> Cmd_Del:	db "DEL", 0
    65 0000F0BD 41545452494200      <1> Cmd_Attrib:	db "ATTRIB", 0
    66 0000F0C4 52454E414D4500      <1> Cmd_Rename:	db "RENAME", 0
    67 0000F0CB 524D44495200        <1> Cmd_Rmdir:	db "RMDIR", 0
    68 0000F0D1 4D4B44495200        <1> Cmd_Mkdir:	db "MKDIR", 0
    69 0000F0D7 434F505900          <1> Cmd_Copy:	db "COPY", 0
    70 0000F0DC 4D4F564500          <1> Cmd_Move:	db "MOVE", 0
    71 0000F0E1 5041544800          <1> Cmd_Path:	db "PATH", 0
    72 0000F0E6 4D454D00            <1> Cmd_Mem:	db "MEM", 0
    73 0000F0EA 00                  <1> 		db 0
    74 0000F0EB 46494E4400          <1> Cmd_Find:	db "FIND", 0
    75 0000F0F0 4543484F00          <1> Cmd_Echo:	db "ECHO", 0
    76 0000F0F5 2A00                <1> Cmd_Remark:	db "*", 0
    77 0000F0F7 3F00                <1> Cmd_Help:	db "?", 0
    78 0000F0F9 44455649434500      <1> Cmd_Device:	db "DEVICE", 0
    79 0000F100 4445564C49535400    <1> Cmd_DevList:	db "DEVLIST", 0
    80 0000F108 434844495200        <1> Cmd_Chdir:	db "CHDIR", 0
    81 0000F10E 4245455000          <1> Cmd_Beep:	db "BEEP", 0
    82                              <1> 		
    83 0000F113 00                  <1> 		db 0
    84                              <1> 
    85                              <1> ; 15/02/2016 (FILE.ASM, 09/10/2011)
    86                              <1> invalid_fname_chars:
    87 0000F114 222728292A2B2C2F    <1> 		db 22h, 27h, 28h, 29h, 2Ah, 2Bh, 2Ch, 2Fh
    88 0000F11C 3A3B3C3D3E3F40      <1> 		db 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh, 40h
    89 0000F123 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 0000F128 456E746572206E6577- <1>                 db 'Enter new date (dd-mm-yy): '
    94 0000F131 206461746520286464- <1>
    94 0000F13A 2D6D6D2D7979293A20  <1>
    95 0000F143 00                  <1>                 db 0
    96                              <1> Msg_Show_Date:
    97 0000F144 43757272656E742064- <1>                 db   'Current date is '
    97 0000F14D 61746520697320      <1>
    98 0000F154 30                  <1> Day:            db   '0'
    99 0000F155 30                  <1> 		db   '0'
   100 0000F156 2F                  <1>                 db   '/'
   101 0000F157 30                  <1> Month:          db   '0'
   102 0000F158 30                  <1> 		db   '0'
   103 0000F159 2F                  <1>                 db   '/'
   104 0000F15A 30                  <1> Century:        db   '0'
   105 0000F15B 30                  <1>                 db   '0'
   106 0000F15C 30                  <1> Year:           db   '0'
   107 0000F15D 30                  <1> 		db   '0'
   108 0000F15E 0D0A00              <1>                 db   0Dh, 0Ah, 0
   109                              <1> 
   110                              <1> Msg_Enter_Time:
   111 0000F161 456E746572206E6577- <1> 		db 'Enter new time: '
   111 0000F16A 2074696D653A20      <1>
   112 0000F171 00                  <1> 		db 0
   113                              <1> Msg_Show_Time:
   114 0000F172 43757272656E742074- <1> 		db   'Current time is '
   114 0000F17B 696D6520697320      <1>
   115 0000F182 30                  <1> Hour:           db   '0'
   116 0000F183 30                  <1> 		db   '0'
   117 0000F184 3A                  <1> 		db   ':'
   118 0000F185 30                  <1> Minute:         db   '0'
   119 0000F186 30                  <1> 		db   '0'
   120 0000F187 3A                  <1> 		db   ':'
   121 0000F188 30                  <1> Second:         db   '0'
   122 0000F189 30                  <1> 		db   '0'
   123 0000F18A 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 0000F18D 206B696C6F62797465- <1> 		db " kilobytes", 0Dh, 0Ah, 0
   129 0000F196 730D0A00            <1>
   130                              <1> VolSize_Bytes:
   131 0000F19A 2062797465730D0A00  <1> 		db " bytes", 0Dh, 0Ah, 0
   132                              <1> Volume_in_drive:
   133 0000F1A3 0D0A                <1> 		db 0Dh, 0Ah
   134                              <1> Vol_FS_Name:
   135 0000F1A5 54522046533120      <1> 		db "TR FS1 "
   136 0000F1AC 566F6C756D6520696E- <1> 		db "Volume in drive "
   136 0000F1B5 20647269766520      <1>
   137 0000F1BC 30                  <1> Vol_Drv_Name:   db 30h
   138 0000F1BD 3A                  <1> 		db ":"
   139 0000F1BE 20697320            <1> 		db " is "
   140 0000F1C2 0D0A00              <1> 		db 0Dh, 0Ah, 0
   141                              <1> Dir_Drive_Str:
   142 0000F1C5 54522D444F53204472- <1>                 db "TR-DOS Drive "
   142 0000F1CE 69766520            <1>
   143                              <1> Dir_Drive_Name:
   144 0000F1D2 303A                <1>                 db "0:"
   145 0000F1D4 0D0A                <1>                 db  0Dh, 0Ah
   146                              <1> Vol_Str_Header:
   147 0000F1D6 566F6C756D65204E61- <1>                 db "Volume Name: "
   147 0000F1DF 6D653A20            <1>
   148                              <1> Vol_Name:
   149 0000F1E3 00<rept>            <1> 		times 64 db 0
   150 0000F223 00                  <1> 		db 0
   151                              <1> Vol_Serial_Header:
   152 0000F224 0D0A                <1> 		db 0Dh, 0Ah
   153 0000F226 566F6C756D65205365- <1> 		db "Volume Serial No: "
   153 0000F22F 7269616C204E6F3A20  <1>
   154                              <1> Vol_Serial1:
   155 0000F238 30303030            <1> 		db "0000"
   156 0000F23C 2D                  <1> 		db "-"
   157                              <1> Vol_Serial2:
   158 0000F23D 30303030            <1> 		db "0000"
   159 0000F241 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 0000F244 0D0A                <1> 		db 0Dh, 0Ah
   165 0000F246 566F6C756D65205369- <1> 		db "Volume Size : ", 0
   165 0000F24F 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 0000F255 467265652053706163- <1> 		db "Free Space  : ", 0
   173 0000F25E 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 0000F264 4469726563746F7279- <1>                 db "Directory: "
   180 0000F26D 3A20                <1>
   181 0000F26F 2F                  <1> Dir_Str_Root:   db "/"
   182 0000F270 00<rept>            <1> Dir_Str:        times 64 db 0
   183 0000F2B0 00000000            <1>                 dd 0
   184 0000F2B4 00                  <1>                 db 0
   185                              <1> 
   186                              <1> Msg_Bad_Command:
   187 0000F2B5 42616420636F6D6D61- <1>                 db "Bad command or file name!"
   187 0000F2BE 6E64206F722066696C- <1>
   187 0000F2C7 65206E616D6521      <1>
   188 0000F2CE 0D0A00              <1>                 db 0Dh, 0Ah, 0
   189                              <1> 
   190                              <1> msgl_drv_not_ready: 
   191 0000F2D1 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 0000F2D4 4472697665206E6F74- <1>                 db "Drive not ready or read error!"
   196 0000F2DD 207265616479206F72- <1>
   196 0000F2E6 207265616420657272- <1>
   196 0000F2EF 6F7221              <1>
   197 0000F2F2 0D0A00              <1>                 db 0Dh, 0Ah, 0
   198                              <1> 
   199                              <1> Msg_Not_Ready_Write_Err:
   200 0000F2F5 4472697665206E6F74- <1>                 db "Drive not ready or write error!"
   200 0000F2FE 207265616479206F72- <1>
   200 0000F307 207772697465206572- <1>
   200 0000F310 726F7221            <1>
   201 0000F314 0D0A00              <1>                 db 0Dh, 0Ah, 0
   202                              <1> 
   203                              <1> Msg_Dir_Not_Found:
   204 0000F317 4469726563746F7279- <1>                 db "Directory not found!"
   204 0000F320 206E6F7420666F756E- <1>
   204 0000F329 6421                <1>
   205 0000F32B 0D0A00              <1>                 db 0Dh, 0Ah, 0
   206                              <1> 
   207                              <1> Msg_File_Not_Found:
   208 0000F32E 46696C65206E6F7420- <1>                 db "File not found!"
   208 0000F337 666F756E6421        <1>
   209 0000F33D 0D0A00              <1>                 db 0Dh, 0Ah, 0
   210                              <1> 
   211                              <1> Msg_File_Directory_Not_Found:
   212 0000F340 46696C65206F722064- <1>                 db "File or directory not found!"
   212 0000F349 69726563746F727920- <1>
   212 0000F352 6E6F7420666F756E64- <1>
   212 0000F35B 21                  <1>
   213 0000F35C 0D0A00              <1>                 db 0Dh, 0Ah, 0
   214                              <1> 
   215                              <1> Msg_LongName_Not_Found:
   216 0000F35F 4C6F6E67206E616D65- <1>                 db "Long name not found!"
   216 0000F368 206E6F7420666F756E- <1>
   216 0000F371 6421                <1>
   217 0000F373 0D0A00              <1>                 db 0Dh, 0Ah, 0
   218                              <1> 
   219                              <1> beep_Insufficient_Memory: ; 20/02/2017
   220 0000F376 0D0A                <1> 		db 0Dh, 0Ah
   221 0000F378 07                  <1> 		db 07h
   222                              <1> Msg_Insufficient_Memory:
   223 0000F379 496E73756666696369- <1>                 db "Insufficient memory!"
   223 0000F382 656E74206D656D6F72- <1>
   223 0000F38B 7921                <1>
   224 0000F38D 0D0A00              <1>                 db 0Dh, 0Ah, 0
   225                              <1> 
   226                              <1> Msg_Error_Code:
   227 0000F390 436F6D6D616E642066- <1>                 db 'Command failed! Error code : '
   227 0000F399 61696C656421204572- <1>
   227 0000F3A2 726F7220636F646520- <1>
   227 0000F3AB 3A20                <1>
   228 0000F3AD 303068              <1> error_code_hex: db '00h'
   229 0000F3B0 0A0A00              <1>                 db 0Ah, 0Ah, 0
   230                              <1> 
   231 0000F3B3 90                  <1> align 2
   232                              <1> 
   233                              <1> ; 10/02/2016
   234                              <1> ; DIR.ASM - 09/10/2011
   235                              <1> 
   236 0000F3B4 3C4449523E20202020- <1> Type_Dir:       db '<DIR>     ' ; 10 bytes
   236 0000F3BD 20                  <1>
   237                              <1> 
   238                              <1> File_Name:
   239 0000F3BE 20<rept>            <1>                 times 12 db 20h
   240 0000F3CA 20                  <1> 		db 20h
   241                              <1> Dir_Or_FileSize:
   242 0000F3CB 20<rept>            <1>                 times 10 db 20h
   243 0000F3D5 20                  <1> 		db 20h
   244                              <1> File_Attribute:
   245 0000F3D6 20202020            <1> 		dd 20202020h
   246 0000F3DA 20                  <1> 		db 20h
   247                              <1> File_Day:
   248 0000F3DB 3030                <1>                 db '0','0'
   249 0000F3DD 2F                  <1> 		db '/'
   250                              <1> File_Month:
   251 0000F3DE 3030                <1>                 db '0','0'
   252 0000F3E0 2F                  <1> 		db '/'
   253                              <1> File_Year:
   254 0000F3E1 30303030            <1>                 db '0','0','0','0'
   255 0000F3E5 20                  <1> 		db 20h
   256                              <1> File_Hour:
   257 0000F3E6 3030                <1>                 db '0','0'
   258 0000F3E8 3A                  <1> 		db ':'
   259                              <1> File_Minute:
   260 0000F3E9 3030                <1>                 db '0','0'
   261 0000F3EB 00                  <1> 		db 0
   262                              <1> 
   263                              <1> Decimal_File_Count_Header:
   264 0000F3EC 0D0A                <1> 		db 0Dh, 0Ah
   265                              <1> Decimal_File_Count:
   266 0000F3EE 00<rept>            <1> 		times 6 db 0
   267                              <1> 
   268 0000F3F4 2066696C6528732920- <1> str_files:	db " file(s) & "
   268 0000F3FD 2620                <1>
   269                              <1> Decimal_Dir_Count: 
   270 0000F3FF 00<rept>            <1> 		times 6 db 0
   271                              <1> str_dirs:       
   272 0000F405 206469726563746F72- <1> 		db " directory(s) "
   272 0000F40E 7928732920          <1>
   273 0000F413 0D0A00              <1> 		db 0Dh, 0Ah, 0
   274                              <1> 
   275 0000F416 206279746528732920- <1> str_bytes:	db " byte(s) in file(s)"
   275 0000F41F 696E2066696C652873- <1>
   275 0000F428 29                  <1>
   276 0000F429 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 0000F42C 496E76616C69642066- <1>                 db "Invalid file or directory name characters!"
   281 0000F435 696C65206F72206469- <1>
   281 0000F43E 726563746F7279206E- <1>
   281 0000F447 616D65206368617261- <1>
   281 0000F450 637465727321        <1>
   282 0000F456 0D0A00              <1>         	db 0Dh, 0Ah, 0
   283                              <1> ; 21/02/2016
   284 0000F459 46696C65206F722064- <1> Msg_Name_Exists: db "File or directory name exists!"
   284 0000F462 69726563746F727920- <1>
   284 0000F46B 6E616D652065786973- <1>
   284 0000F474 747321              <1>
   285 0000F477 0D0A00              <1>                 db 0Dh, 0Ah, 0
   286                              <1> Msg_DoYouWantMkdir:
   287 0000F47A 446F20796F75207761- <1>                 db "Do you want to make directory ", 0
   287 0000F483 6E7420746F206D616B- <1>
   287 0000F48C 65206469726563746F- <1>
   287 0000F495 72792000            <1>
   288 0000F499 2028592F4E29203F20- <1> Msg_YesNo:      db " (Y/N) ? ", 0  
   288 0000F4A2 00                  <1>
   289 0000F4A3 000D0A00            <1> Y_N_nextline:	db 0, 0Dh, 0Ah, 0 
   290 0000F4A7 4F4B2E0D0A00        <1> Msg_OK:		db "OK.", 0Dh, 0Ah, 0
   291                              <1> 
   292                              <1> ; 27/02/2016
   293                              <1> Msg_DoYouWantRmDir:
   294 0000F4AD 446F20796F75207761- <1>                 db "Do you want to delete directory ", 0
   294 0000F4B6 6E7420746F2064656C- <1>
   294 0000F4BF 657465206469726563- <1>
   294 0000F4C8 746F72792000        <1>
   295                              <1> Msg_Dir_Not_Empty:
   296 0000F4CE 4469726563746F7279- <1>                 db "Directory not empty!"
   296 0000F4D7 206E6F7420656D7074- <1>
   296 0000F4E0 7921                <1>
   297 0000F4E2 0D0A00              <1>                 db 0Dh, 0Ah, 0
   298                              <1> 
   299                              <1> Msg_DoYouWantDelete:
   300 0000F4E5 446F20796F75207761- <1>                 db "Do you want to delete file ",0
   300 0000F4EE 6E7420746F2064656C- <1>
   300 0000F4F7 6574652066696C6520- <1>
   300 0000F500 00                  <1>
   301                              <1> 
   302 0000F501 44656C657465642E2E- <1> Msg_Deleted:    db "Deleted...", 0Dh, 0Ah, 0
   302 0000F50A 2E0D0A00            <1>
   303                              <1> 
   304                              <1> Msg_Permission_Denied:
   305 0000F50E 07                  <1>                 db 7
   306 0000F50F 5065726D697373696F- <1>                 db "Permission denied!", 0Dh, 0Ah, 0
   306 0000F518 6E2064656E69656421- <1>
   306 0000F521 0D0A00              <1>
   307                              <1> 
   308                              <1> ; 04/03/2016
   309 0000F524 4E657720            <1> Msg_New:        db "New "
   310 0000F528 00                  <1>                 db 0
   311                              <1> Str_Attributes:
   312 0000F529 417474726962757465- <1>                 db "Attributes : "
   312 0000F532 73203A20            <1>
   313 0000F536 4E4F524D414C        <1> Attr_Chars:     db "NORMAL"
   314 0000F53C 00                  <1>                 db 0
   315                              <1> 
   316                              <1> ; 06/03/2016
   317                              <1> ; CMD_INTR.ASM - 16/11/2010 
   318                              <1> Msg_DoYouWantRename:
   319 0000F53D 446F20796F75207761- <1>                 db "Do you want to rename ", 0
   319 0000F546 6E7420746F2072656E- <1>
   319 0000F54F 616D652000          <1>
   320 0000F554 66696C652000        <1> Rename_File:    db "file ", 0
   321 0000F55A 6469726563746F7279- <1> Rename_Directory: db "directory ", 0
   321 0000F563 2000                <1>
   322 0000F565 00<rept>            <1> Rename_OldName: times 13 db 0
   323 0000F572 20617320            <1> Msg_File_rename_as: db " as "
   324 0000F576 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 0000F583 4E6F742073616D6520- <1>                 db "Not same drive!" 
   329 0000F58C 647269766521        <1>
   330 0000F592 0D0A00              <1>                 db 0Dh, 0Ah, 0 
   331                              <1> 
   332                              <1> Msg_DoYouWantMoveFile:
   333 0000F595 446F20796F75207761- <1>                 db "Do you want to move file", 0
   333 0000F59E 6E7420746F206D6F76- <1>
   333 0000F5A7 652066696C6500      <1>
   334                              <1> 
   335                              <1> msg_insufficient_disk_space:
   336 0000F5AE 496E73756666696369- <1>                 db "Insufficient disk space!" 
   336 0000F5B7 656E74206469736B20- <1>
   336 0000F5C0 737061636521        <1>
   337 0000F5C6 0D0A00              <1>                 db 0Dh, 0Ah, 0
   338                              <1> 
   339                              <1> ; 01/08/2010
   340                              <1> msg_source_file: 
   341 0000F5C9 0D0A536F7572636520- <1> 		db 0Dh, 0Ah, "Source file name      :   "
   341 0000F5D2 66696C65206E616D65- <1>
   341 0000F5DB 2020202020203A2020- <1>
   341 0000F5E4 20                  <1>
   342                              <1> msg_source_file_drv: 
   343 0000F5E5 203A00              <1> 		db " :", 0
   344                              <1> msg_destination_file: 
   345 0000F5E8 0D0A44657374696E61- <1> 		db 0Dh, 0Ah, "Destination file name :   "
   345 0000F5F1 74696F6E2066696C65- <1>
   345 0000F5FA 206E616D65203A2020- <1>
   345 0000F603 20                  <1>
   346                              <1> msg_destination_file_drv: 
   347 0000F604 203A00              <1> 		db " :", 0
   348                              <1> msg_copy_nextline: 
   349 0000F607 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 0000F60A 446F20796F75207761- <1>                 db "Do you want to overwrite file ",0
   355 0000F613 6E7420746F206F7665- <1>
   355 0000F61C 727772697465206669- <1>
   355 0000F625 6C652000            <1>
   356                              <1>   
   357                              <1> Msg_DoYouWantCopyFile:
   358 0000F629 446F20796F75207761- <1>                 db "Do you want to copy file",0
   358 0000F632 6E7420746F20636F70- <1>
   358 0000F63B 792066696C6500      <1>
   359                              <1> 
   360                              <1> Msg_read_file_error_before_EOF:
   361 0000F642 46696C652072656164- <1> 		db "File reading error! (before EOF)"
   361 0000F64B 696E67206572726F72- <1>
   361 0000F654 2120286265666F7265- <1>
   361 0000F65D 20454F4629          <1>
   362 0000F662 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 0000F665 52656164696E672E2E- <1> 		db "Reading... ", 0
   367 0000F66E 2E2000              <1>
   368                              <1> msg_writing:
   369 0000F671 57726974696E672E2E- <1> 		db "Writing... ", 0
   369 0000F67A 2E2000              <1>
   370                              <1> percentagestr:
   371 0000F67D 2020202500          <1> 		db "   %", 0  ; "  0%" .. "100%"
   372                              <1> ; 11/04/2016
   373                              <1> Msg_No_Set_Space:
   374 0000F682 496E73756666696369- <1>                 db "Insufficient environment space!"
   374 0000F68B 656E7420656E766972- <1>
   374 0000F694 6F6E6D656E74207370- <1>
   374 0000F69D 61636521            <1>
   375 0000F6A1 0D0A00              <1>                 db 0Dh, 0Ah, 0
   376                              <1> ; 18/04/2016
   377                              <1> isc_msg:	
   378 0000F6A4 0D0A                <1> 		db 0Dh, 0Ah
   379 0000F6A6 494E56414C49442053- <1> 		db "INVALID SYSTEM CALL", 0
   379 0000F6AF 595354454D2043414C- <1>
   379 0000F6B8 4C00                <1>
   380                              <1> usi_msg:
   381 0000F6BA 0D0A                <1> 		db 0Dh, 0Ah
   382 0000F6BC 554E444546494E4544- <1> 		db "UNDEFINED SOFTWARE INTERRUPT", 0
   382 0000F6C5 20534F465457415245- <1>
   382 0000F6CE 20494E544552525550- <1>
   382 0000F6D7 5400                <1>
   383                              <1> ifc_msg:
   384 0000F6D9 0D0A                <1> 		db 0Dh, 0Ah
   385 0000F6DB 494E56414C49442046- <1> 		db "INVALID FUNCTION CALL"
   385 0000F6E4 554E4354494F4E2043- <1>
   385 0000F6ED 414C4C              <1>
   386                              <1> inv_msg_for_trdos_v2:
   387 0000F6F0 20                  <1> 		db 20h
   388 0000F6F1 666F72205452444F53- <1> 		db "for TRDOS v2!"
   388 0000F6FA 20763221            <1>
   389 0000F6FE 07                  <1> 		db 07h
   390 0000F6FF 0D0A                <1> 		db 0Dh, 0Ah
   391 0000F701 0D0A                <1> 		db 0Dh, 0Ah
   392 0000F703 494E5420            <1> 		db "INT "
   393 0000F707 303068              <1> int_num_str:	db "00h"
   394 0000F70A 0D0A                <1> 		db 0Dh, 0Ah
   395 0000F70C 454158203A20        <1> 		db "EAX : "
   396 0000F712 303030303030303068- <1> eax_str:	db "00000000h", 0Dh, 0Ah
   396 0000F71B 0D0A                <1>
   397 0000F71D 454950203A20        <1> 		db "EIP : "
   398 0000F723 303030303030303068- <1> eip_str:	db "00000000h", 0Dh, 0Ah, 0
   398 0000F72C 0D0A00              <1>
   399                              <1> 
   400                              <1> ; 07/10/2016
   401                              <1> ; Device names & parameters (for kernel devices)
   402                              <1> 
   403 0000F72F 90                  <1> align 2
   404                              <1> KDEV_NAME:
   405 0000F730 5454590000000000    <1> 		db 'TTY',0,0,0,0,0 ; 1
   406 0000F738 4D454D0000000000    <1> 		db 'MEM',0,0,0,0,0 ; 2
   407 0000F740 4644300000000000    <1> 		db 'FD0',0,0,0,0,0 ; 3
   408 0000F748 4644310000000000    <1> 		db 'FD1',0,0,0,0,0 ; 4
   409 0000F750 4844300000000000    <1> 		db 'HD0',0,0,0,0,0 ; 5
   410 0000F758 4844310000000000    <1> 		db 'HD1',0,0,0,0,0 ; 6
   411 0000F760 4844320000000000    <1> 		db 'HD2',0,0,0,0,0 ; 7
   412 0000F768 4844330000000000    <1> 		db 'HD3',0,0,0,0,0 ; 8
   413 0000F770 4C50540000000000    <1> 		db 'LPT',0,0,0,0,0 ; 9
   414 0000F778 5454593000000000    <1> 		db 'TTY0',0,0,0,0 ; 10
   415 0000F780 5454593100000000    <1> 		db 'TTY1',0,0,0,0 ; 11
   416 0000F788 5454593200000000    <1> 		db 'TTY2',0,0,0,0 ; 12
   417 0000F790 5454593300000000    <1> 		db 'TTY3',0,0,0,0 ; 13
   418 0000F798 5454593400000000    <1> 		db 'TTY4',0,0,0,0 ; 14
   419 0000F7A0 5454593500000000    <1> 		db 'TTY5',0,0,0,0 ; 15
   420 0000F7A8 5454593600000000    <1> 		db 'TTY6',0,0,0,0 ; 16
   421 0000F7B0 5454593700000000    <1> 		db 'TTY7',0,0,0,0 ; 17
   422 0000F7B8 5454593800000000    <1> 		db 'TTY8',0,0,0,0 ; 18
   423 0000F7C0 5454593900000000    <1> 		db 'TTY9',0,0,0,0 ; 19
   424 0000F7C8 434F4D3100000000    <1> 		db 'COM1',0,0,0,0 ; 18
   425 0000F7D0 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 0000F7D8 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 0000F7E0 010203040506070809  <1> 		db 1,2,3,4,5,6,7,8,9
   468 0000F7E9 0A0B0C0D0E0F101112- <1> 		db 10,11,12,13,14,15,16,17,18,19
   468 0000F7F2 13                  <1>
   469 0000F7F3 121300              <1> 		db 18,19,0
   470                              <1> 
   471                              <1> NumOfKernelDevices equ $ - KDEV_NUMBER
   472                              <1> 
   473                              <1> KDEV_OADDR:
   474 0000F7F6 [13F00000]          <1> 		dd otty ;tty  ; 1
   475 0000F7FA [13F00000]          <1> 		dd sret ;mem  ; 2
   476 0000F7FE [13F00000]          <1>  		dd sret ;fd0  ; 3
   477 0000F802 [13F00000]          <1>  		dd sret ;fd1  ; 4
   478 0000F806 [13F00000]          <1>  		dd sret ;hd0  ; 5
   479 0000F80A [13F00000]          <1>  		dd sret ;hd1  ; 6
   480 0000F80E [13F00000]          <1>  		dd sret ;hd2  ; 7
   481 0000F812 [13F00000]          <1>  		dd sret ;hd3  ; 8
   482 0000F816 [13F00000]          <1>  		dd sret ;lpt  ; 9
   483 0000F81A [13F00000]          <1>  		dd ocvt ;tty0 ; 10
   484 0000F81E [13F00000]          <1> 		dd ocvt ;tty1 ; 11
   485 0000F822 [13F00000]          <1>  		dd ocvt ;tty2 ; 12
   486 0000F826 [13F00000]          <1>  		dd ocvt ;tty3 ; 13
   487 0000F82A [13F00000]          <1>  		dd ocvt ;tty4 ; 14
   488 0000F82E [13F00000]          <1>  		dd ocvt ;tty5 ; 15
   489 0000F832 [13F00000]          <1>  		dd ocvt ;tty6 ; 16
   490 0000F836 [13F00000]          <1>  		dd ocvt ;tty7 ; 17
   491 0000F83A [13F00000]          <1>  		dd ocvt ;tty8 ; 18
   492 0000F83E [13F00000]          <1>  		dd ocvt ;tty9 ; 19
   493                              <1>  		;dd ocvt ;com1 ; 18
   494                              <1>  		;dd ocvt ;com2 ; 19
   495 0000F842 [13F00000]          <1> 		dd sret ;null ; 20  
   496                              <1> KDEV_CADDR:
   497 0000F846 [13F00000]          <1> 		dd ctty ;tty  ; 1
   498 0000F84A [13F00000]          <1> 		dd cret ;mem  ; 2
   499 0000F84E [13F00000]          <1>  		dd cret ;fd0  ; 3
   500 0000F852 [13F00000]          <1>  		dd cret ;fd1  ; 4
   501 0000F856 [13F00000]          <1>  		dd cret ;hd0  ; 5
   502 0000F85A [13F00000]          <1>  		dd cret ;hd1  ; 6
   503 0000F85E [13F00000]          <1>  		dd cret ;hd2  ; 7
   504 0000F862 [13F00000]          <1>  		dd cret ;hd3  ; 8
   505 0000F866 [13F00000]          <1>  		dd cret ;lpt  ; 9
   506 0000F86A [13F00000]          <1>  		dd ocvt ;tty0 ; 10
   507 0000F86E [13F00000]          <1> 		dd ccvt ;tty1 ; 11
   508 0000F872 [13F00000]          <1>  		dd ccvt ;tty2 ; 12
   509 0000F876 [13F00000]          <1>  		dd ccvt ;tty3 ; 13
   510 0000F87A [13F00000]          <1>  		dd ccvt ;tty4 ; 14
   511 0000F87E [13F00000]          <1>  		dd ccvt ;tty5 ; 15
   512 0000F882 [13F00000]          <1>  		dd ccvt ;tty6 ; 16
   513 0000F886 [13F00000]          <1>  		dd ccvt ;tty7 ; 17
   514 0000F88A [13F00000]          <1>  		dd ccvt ;tty8 ; 18
   515 0000F88E [13F00000]          <1>  		dd ccvt ;tty9 ; 19
   516                              <1>  		;dd ccvt ;com1 ; 18
   517                              <1>  		;dd ccvt ;com2 ; 19
   518 0000F892 [13F00000]          <1> 		dd cret ;null ; 20
   519                              <1> 
   520                              <1> KDEV_RADDR:
   521 0000F896 [13F00000]          <1> 		dd rtty ;tty  ; 1
   522 0000F89A [13F00000]          <1> 		dd rmem ;mem  ; 2
   523 0000F89E [13F00000]          <1>  		dd rfd  ;fd0  ; 3
   524 0000F8A2 [13F00000]          <1>  		dd rfd  ;fd1  ; 4
   525 0000F8A6 [13F00000]          <1>  		dd rhd  ;hd0  ; 5
   526 0000F8AA [13F00000]          <1>  		dd rhd  ;hd1  ; 6
   527 0000F8AE [13F00000]          <1>  		dd rhd  ;hd2  ; 7
   528 0000F8B2 [13F00000]          <1>  		dd rhd  ;hd3  ; 8
   529 0000F8B6 [13F00000]          <1>  		dd rlpt ;lpt  ; 9
   530 0000F8BA [13F00000]          <1>  		dd rcvt ;tty0 ; 10
   531 0000F8BE [13F00000]          <1> 		dd rcvt ;tty1 ; 11
   532 0000F8C2 [13F00000]          <1>  		dd rcvt ;tty2 ; 12
   533 0000F8C6 [13F00000]          <1>  		dd rcvt ;tty3 ; 13
   534 0000F8CA [13F00000]          <1>  		dd rcvt ;tty4 ; 14
   535 0000F8CE [13F00000]          <1>  		dd rcvt ;tty5 ; 15
   536 0000F8D2 [13F00000]          <1>  		dd rcvt ;tty6 ; 16
   537 0000F8D6 [13F00000]          <1>  		dd rcvt ;tty7 ; 17
   538 0000F8DA [13F00000]          <1>  		dd rcvt ;tty8 ; 18
   539 0000F8DE [13F00000]          <1>  		dd rcvt ;tty9 ; 19
   540                              <1>  		;dd rcvt ;com1 ; 18
   541                              <1>  		;dd rcvt ;com2 ; 19
   542 0000F8E2 [11F00000]          <1> 		dd rnull ;null ; 20  
   543                              <1> KDEV_WADDR:
   544 0000F8E6 [13F00000]          <1> 		dd wtty ;tty  ; 1
   545 0000F8EA [13F00000]          <1> 		dd wmem ;mem  ; 2
   546 0000F8EE [13F00000]          <1>  		dd wfd  ;fd0  ; 3
   547 0000F8F2 [13F00000]          <1>  		dd wfd  ;fd1  ; 4
   548 0000F8F6 [13F00000]          <1>  		dd whd  ;hd0  ; 5
   549 0000F8FA [13F00000]          <1>  		dd whd  ;hd1  ; 6
   550 0000F8FE [13F00000]          <1>  		dd whd  ;hd2  ; 7
   551 0000F902 [13F00000]          <1>  		dd whd  ;hd3  ; 8
   552 0000F906 [13F00000]          <1>  		dd wlpt ;lpt  ; 9
   553 0000F90A [13F00000]          <1>  		dd xmtt ;tty0 ; 10
   554 0000F90E [13F00000]          <1> 		dd xmtt ;tty1 ; 11
   555 0000F912 [13F00000]          <1>  		dd xmtt ;tty2 ; 12
   556 0000F916 [13F00000]          <1>  		dd xmtt ;tty3 ; 13
   557 0000F91A [13F00000]          <1>  		dd xmtt ;tty4 ; 14
   558 0000F91E [13F00000]          <1>  		dd xmtt ;tty5 ; 15
   559 0000F922 [13F00000]          <1>  		dd xmtt ;tty6 ; 16
   560 0000F926 [13F00000]          <1>  		dd xmtt ;tty7 ; 17
   561 0000F92A [13F00000]          <1>  		dd xmtt ;tty8 ; 18
   562 0000F92E [13F00000]          <1>  		dd xmtt ;tty9 ; 19
   563                              <1>  		;dd xmtt ;com1 ; 18
   564                              <1>  		;dd xmtt ;com2 ; 19
   565 0000F932 [12F00000]          <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 0000F936 07                  <1> 		db  00000111b	; tty, 1
   579 0000F937 07                  <1> 		db  00000111b	; mem, 2	
   580 0000F938 8F                  <1> 		db  10001111b	; fd0, 3	
   581 0000F939 8F                  <1> 		db  10001111b	; fd1, 4
   582 0000F93A 8F                  <1> 		db  10001111b	; hd0, 5
   583 0000F93B 8F                  <1> 		db  10001111b	; hd1, 6
   584 0000F93C 8F                  <1> 		db  10001111b	; hd2, 7
   585 0000F93D 8F                  <1> 		db  10001111b	; hd3, 8
   586 0000F93E 07                  <1> 		db  00000111b   ; lpt, 9
   587 0000F93F 07                  <1> 		db  00000111b	; tty0, 10
   588 0000F940 07                  <1> 		db  00000111b	; tty1, 11
   589 0000F941 07                  <1> 		db  00000111b	; tty2, 12
   590 0000F942 07                  <1> 		db  00000111b	; tty3, 13
   591 0000F943 07                  <1> 		db  00000111b	; tty4, 14
   592 0000F944 07                  <1> 		db  00000111b	; tty5, 15
   593 0000F945 07                  <1> 		db  00000111b	; tty6, 16
   594 0000F946 07                  <1> 		db  00000111b	; tty7, 17
   595 0000F947 07                  <1> 		db  00000111b	; tty8, 18
   596 0000F948 07                  <1> 		db  00000111b	; tty9, 19
   597                              <1> 		;db 00000111b	; com1, 18
   598                              <1> 		;db 00000111b	; com2, 19
   599 0000F949 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		
  2163                                  
  2164 0000F94A 90<rept>                align 16
  2165                                  
  2166                                  gdt:	; Global Descriptor Table
  2167                                  	; (30/07/2015, conforming cs)
  2168                                  	; (26/03/2015)
  2169                                  	; (24/03/2015, tss)
  2170                                  	; (19/03/2015)
  2171                                  	; (29/12/2013)
  2172                                  	;
  2173 0000F950 0000000000000000        	dw 0, 0, 0, 0		; NULL descriptor
  2174                                  	; 18/08/2014
  2175                                  			; 8h kernel code segment, base = 00000000h		
  2176                                  	;dw 0FFFFh, 0, 9E00h, 00CFh	; KCODE  ; 30/12/2016	 
  2177 0000F958 FFFF0000009ACF00        	dw 0FFFFh, 0, 9A00h, 00CFh	; KCODE
  2178                                  			; 10h kernel data segment, base = 00000000h	
  2179 0000F960 FFFF00000092CF00        	dw 0FFFFh, 0, 9200h, 00CFh	; KDATA
  2180                                  			; 1Bh user code segment, base address = 400000h ; CORE
  2181                                  	;dw 0FBFFh, 0, 0FE40h, 00CFh	; UCODE  ; 30/12/2016	
  2182 0000F968 FFFB000040FACF00        	dw 0FBFFh, 0, 0FA40h, 00CFh	; UCODE 
  2183                                  			; 23h user data segment, base address = 400000h ; CORE
  2184 0000F970 FFFB000040F2CF00        	dw 0FBFFh, 0, 0F240h, 00CFh	; UDATA
  2185                                  			; Task State Segment
  2186 0000F978 6700                    	dw 0067h ; Limit = 103 ; (104-1, tss size = 104 byte, 
  2187                                  			       ;  no IO permission in ring 3)
  2188                                  gdt_tss0:
  2189 0000F97A 0000                    	dw 0  ; TSS base address, bits 0-15 
  2190                                  gdt_tss1:
  2191 0000F97C 00                      	db 0  ; TSS base address, bits 16-23 
  2192                                  	      		; 49h	
  2193 0000F97D E9                      	db 11101001b ; E9h => P=1/DPL=11/0/1/0/B/1 --> B = Task is busy (1)
  2194 0000F97E 00                      	db 0 ; G/0/0/AVL/LIMIT=0000 ; (Limit bits 16-19 = 0000) (G=0, 1 byte)
  2195                                  gdt_tss2:
  2196 0000F97F 00                      	db 0  ; TSS base address, bits 24-31 
  2197                                  
  2198                                  gdt_end:
  2199                                  	;; 9Eh = 1001 1110b (GDT byte 5) P=1/DPL=00/1/TYPE=1110, 
  2200                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2201                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2202                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2203                                  
  2204                                  	;; 9Ah = 1001 1010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2205                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2206                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2207                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2208                                  
  2209                                  	;; 92h = 1001 0010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2210                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2211                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2212                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  2213                                  		; W= Writeable, A= Accessed
  2214                                  
  2215                                  	;; FEh = 1111 1110b (GDT byte 5) P=1/DPL=11/1/TYPE=1110, 
  2216                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2217                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2218                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2219                                  	
  2220                                  	;; FAh = 1111 1010b (GDT byte 5) P=1/DPL=11/1/TYPE=1010, 
  2221                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2222                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2223                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2224                                  
  2225                                  	;; F2h = 1111 0010b (GDT byte 5) P=1/DPL=11/1/TYPE=0010, 
  2226                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2227                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2228                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  2229                                  	
  2230                                  	;; CFh = 1100 1111b (GDT byte 6) G=1/B=1/0/AVL=0, Limit=1111b (3)
  2231                                  
  2232                                  		;; Limit = FFFFFh (=> FFFFFh+1= 100000h) // bits 0-15, 48-51 //
  2233                                  		;	 = 100000h * 1000h (G=1) = 4GB
  2234                                  		;; Limit = FFBFFh (=> FFBFFh+1= FFC00h) // bits 0-15, 48-51 //
  2235                                  		;	 = FFC00h * 1000h (G=1) = 4GB - 4MB
  2236                                  		; G= Granularity (1= 4KB), B= Big (32 bit), 
  2237                                  		; AVL= Available to programmers	
  2238                                  
  2239                                  gdtd:
  2240 0000F980 2F00                            dw gdt_end - gdt - 1    ; Limit (size)
  2241 0000F982 [50F90000]                      dd gdt			; Address of the GDT
  2242                                  
  2243                                  	; 20/08/2014
  2244                                  idtd:
  2245 0000F986 7F02                            dw idt_end - idt - 1    ; Limit (size)
  2246 0000F988 [C0300100]                      dd idt			; Address of the IDT
  2247                                  
  2248                                  ; 20/02/2017
  2249                                  ;;; 11/03/2015
  2250                                  %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 0000F98C [EFF90000]          <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 0000F990 01                  <1> 		DB	01		;DRIVE TYPE, MEDIA TABLE
   113                              <1>                 ;DW      MD_TBL1
   114 0000F991 [AEF90000]          <1> 		dd	MD_TBL1
   115 0000F995 82                  <1> 		DB	02+BIT7ON
   116                              <1> 		;DW      MD_TBL2
   117 0000F996 [BBF90000]          <1>                 dd      MD_TBL2
   118 0000F99A 02                  <1> DR_DEFAULT:	DB	02
   119                              <1>                 ;DW      MD_TBL3
   120 0000F99B [C8F90000]          <1> 		dd      MD_TBL3
   121 0000F99F 03                  <1> 		DB	03
   122                              <1>                 ;DW      MD_TBL4
   123 0000F9A0 [D5F90000]          <1> 		dd      MD_TBL4
   124 0000F9A4 84                  <1> 		DB	04+BIT7ON
   125                              <1>                 ;DW      MD_TBL5
   126 0000F9A5 [E2F90000]          <1> 		dd      MD_TBL5
   127 0000F9A9 04                  <1> 		DB	04
   128                              <1>                 ;DW      MD_TBL6
   129 0000F9AA [EFF90000]          <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 0000F9AE DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   141 0000F9AF 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   142 0000F9B0 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   143 0000F9B1 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   144 0000F9B2 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   145 0000F9B3 2A                  <1> 	DB	02AH		; GAP LENGTH
   146 0000F9B4 FF                  <1> 	DB	0FFH		; DTL
   147 0000F9B5 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   148 0000F9B6 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   149 0000F9B7 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   150 0000F9B8 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   151 0000F9B9 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   152 0000F9BA 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 0000F9BB DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   158 0000F9BC 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   159 0000F9BD 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   160 0000F9BE 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   161 0000F9BF 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   162 0000F9C0 2A                  <1> 	DB	02AH		; GAP LENGTH
   163 0000F9C1 FF                  <1> 	DB	0FFH		; DTL
   164 0000F9C2 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   165 0000F9C3 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   166 0000F9C4 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   167 0000F9C5 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   168 0000F9C6 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   169 0000F9C7 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 0000F9C8 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   175 0000F9C9 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   176 0000F9CA 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   177 0000F9CB 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   178 0000F9CC 0F                  <1> 	DB	15		; EOT (LAST SECTOR ON TRACK)
   179 0000F9CD 1B                  <1> 	DB	01BH		; GAP LENGTH
   180 0000F9CE FF                  <1> 	DB	0FFH		; DTL
   181 0000F9CF 54                  <1> 	DB	054H		; GAP LENGTH FOR FORMAT
   182 0000F9D0 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   183 0000F9D1 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   184 0000F9D2 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   185 0000F9D3 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   186 0000F9D4 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 0000F9D5 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   192 0000F9D6 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   193 0000F9D7 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   194 0000F9D8 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   195 0000F9D9 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   196 0000F9DA 2A                  <1> 	DB	02AH		; GAP LENGTH
   197 0000F9DB FF                  <1> 	DB	0FFH		; DTL
   198 0000F9DC 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   199 0000F9DD F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   200 0000F9DE 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   201 0000F9DF 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   202 0000F9E0 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   203 0000F9E1 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 0000F9E2 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   209 0000F9E3 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   210 0000F9E4 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   211 0000F9E5 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   212 0000F9E6 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   213 0000F9E7 2A                  <1> 	DB	02AH		; GAP LENGTH
   214 0000F9E8 FF                  <1> 	DB	0FFH		; DTL
   215 0000F9E9 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   216 0000F9EA F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   217 0000F9EB 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   218 0000F9EC 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   219 0000F9ED 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   220 0000F9EE 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 0000F9EF AF                  <1> 	DB	10101111B	; SRT=A, HD UNLOAD=0F - 1ST SPECIFY BYTE
   226 0000F9F0 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   227 0000F9F1 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   228 0000F9F2 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   229 0000F9F3 12                  <1> 	DB	18		; EOT (LAST SECTOR ON TRACK)
   230 0000F9F4 1B                  <1> 	DB	01BH		; GAP LENGTH
   231 0000F9F5 FF                  <1> 	DB	0FFH		; DTL
   232 0000F9F6 6C                  <1> 	DB	06CH		; GAP LENGTH FOR FORMAT
   233 0000F9F7 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   234 0000F9F8 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   235 0000F9F9 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   236 0000F9FA 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   237 0000F9FB 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 0000F9FC E0                  <1> 	db	NO_ERR
   280 0000F9FD 024001BB            <1> 	db	BAD_ADDR_MARK,BAD_SEEK,BAD_CMD,UNDEF_ERR
   281 0000FA01 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 0000FA05 00                  <1> cfd:		db 0			; current floppy drive (for GET_PARM)
   286                              <1> ; 17/12/2014				; instead of 'DISK_POINTER'
   287 0000FA06 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 0000FA07 90                  <1> align 2
   293                              <1> 
   294 0000FA08 F001                <1> HF_PORT:	dw 	1F0h  ; Default = 1F0h
   295                              <1> 			      ; (170h)
   296 0000FA0A F603                <1> HF_REG_PORT:	dw	3F6h  ; HF_PORT + 206h
   297                              <1> 
   298                              <1> ; 05/01/2015 
   299 0000FA0C 00                  <1> hf_m_s:         db      0     ; (0 = Master, 1 = Slave)
   300                              <1> 
   301                              <1> ; *****************************************************************************
  2251                                  
  2252 0000FA0D 90                      Align 2
  2253                                  
  2254                                  ; 04/11/2014 (Retro UNIX 386 v1)
  2255 0000FA0E 0000                    mem_1m_1k:   dw 0  ; Number of contiguous KB between
  2256                                                       ; 1 and 16 MB, max. 3C00h = 15 MB.
  2257 0000FA10 0000                    mem_16m_64k: dw 0  ; Number of contiguous 64 KB blocks
  2258                                  		   ; between 16 MB and 4 GB.
  2259                                  
  2260                                  ; 12/11/2014 (Retro UNIX 386 v1)
  2261 0000FA12 00                      boot_drv:    db 0 ; boot drive number (physical)
  2262                                  ; 24/11/2014
  2263 0000FA13 00                      drv:	     db 0 
  2264 0000FA14 00                      last_drv:    db 0 ; last hdd
  2265 0000FA15 00                      hdc:         db 0  ; number of hard disk drives
  2266                                  		     ; (present/detected)
  2267                                  
  2268                                  ; 24/11/2014 (Retro UNIX 386 v1)
  2269                                  ; Physical drive type & flags
  2270 0000FA16 00                      fd0_type:    db 0  ; floppy drive type
  2271 0000FA17 00                      fd1_type:    db 0  ; 4 = 1.44 Mb, 80 track, 3.5" (18 spt)
  2272                                  		     ; 6 = 2.88 Mb, 80 track, 3.5" (36 spt)
  2273                                  		     ; 3 = 720 Kb, 80 track, 3.5" (9 spt)
  2274                                  		     ; 2 = 1.2 Mb, 80 track, 5.25" (15 spt)
  2275                                  		     ; 1 = 360 Kb, 40 track, 5.25" (9 spt)		
  2276 0000FA18 00                      hd0_type:    db 0  ; EDD status for hd0 (bit 7 = present flag)
  2277 0000FA19 00                      hd1_type:    db 0  ; EDD status for hd1 (bit 7 = present flag)
  2278 0000FA1A 00                      hd2_type:    db 0  ; EDD status for hd2 (bit 7 = present flag)
  2279 0000FA1B 00                      hd3_type:    db 0  ; EDD status for hd3 (bit 7 = present flag)
  2280                                  		     ; bit 0 - Fixed disk access subset supported
  2281                                  		     ; bit 1 - Drive locking and ejecting
  2282                                  		     ; bit 2 - Enhanced disk drive support
  2283                                  		     ; bit 3 = Reserved (64 bit EDD support)
  2284                                  		     ; (If bit 0 is '1' Retro UNIX 386 v1
  2285                                  		     ; will interpret it as 'LBA ready'!)
  2286                                  
  2287                                  ; 11/03/2015 - 10/07/2015
  2288 0000FA1C 000000000000000000-     drv.cylinders: dw 0,0,0,0,0,0,0
  2288 0000FA25 0000000000         
  2289 0000FA2A 000000000000000000-     drv.heads:     dw 0,0,0,0,0,0,0
  2289 0000FA33 0000000000         
  2290 0000FA38 000000000000000000-     drv.spt:       dw 0,0,0,0,0,0,0
  2290 0000FA41 0000000000         
  2291 0000FA46 000000000000000000-     drv.size:      dd 0,0,0,0,0,0,0
  2291 0000FA4F 000000000000000000-
  2291 0000FA58 000000000000000000-
  2291 0000FA61 00                 
  2292 0000FA62 00000000000000          drv.status:    db 0,0,0,0,0,0,0
  2293 0000FA69 00000000000000          drv.error:     db 0,0,0,0,0,0,0	
  2294                                  
  2295                                  Align 2
  2296                                  
  2297                                  ;;; 11/03/2015
  2298                                  %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 0000FA70 524F50514B          <1> K30:	db	82,79,80,81,75
    36 0000FA75 4C4D474849          <1> 	db	76,77,71,72,73		; 10 NUMBER ON KEYPAD
    37                              <1> ;-----	SUPER-SHIFT-TABLE 
    38 0000FA7A 101112131415        <1> 	db	16,17,18,19,20,21	; A-Z TYPEWRITER CHARS
    39 0000FA80 161718191E1F        <1> 	db	22,23,24,25,30,31
    40 0000FA86 202122232425        <1> 	db	32,33,34,35,36,37
    41 0000FA8C 262C2D2E2F30        <1> 	db	38,44,45,46,47,48
    42 0000FA92 3132                <1> 	db	49,50
    43                              <1> 
    44                              <1> ;-----	TABLE OF SHIFT KEYS AND MASK VALUES
    45                              <1> ;-----	KEY_TABLE 
    46 0000FA94 52                  <1> _K6:    db      INS_KEY                 ; INSERT KEY
    47 0000FA95 3A4546381D          <1> 	db	CAPS_KEY,NUM_KEY,SCROLL_KEY,ALT_KEY,CTL_KEY
    48 0000FA9A 2A36                <1>         db      LEFT_KEY,RIGHT_KEY
    49                              <1> _K6L    equ     $-_K6
    50                              <1> 
    51                              <1> ;-----	MASK_TABLE
    52 0000FA9C 80                  <1> _K7:    db      INS_SHIFT               ; INSERT MODE SHIFT
    53 0000FA9D 4020100804          <1> 	db	CAPS_SHIFT,NUM_SHIFT,SCROLL_SHIFT,ALT_SHIFT,CTL_SHIFT
    54 0000FAA2 0201                <1> 	db	LEFT_SHIFT,RIGHT_SHIFT
    55                              <1> 
    56                              <1> ;-----	TABLES FOR CTRL CASE		;---- CHARACTERS ------
    57 0000FAA4 1BFF00FFFFFF        <1> _K8:	db	27,-1,0,-1,-1,-1	; Esc, 1, 2, 3, 4, 5
    58 0000FAAA 1EFFFFFFFF1F        <1> 	db 	30,-1,-1,-1,-1,31	; 6, 7, 8, 9, 0, -
    59 0000FAB0 FF7FFF111705        <1> 	db	-1,127,-1,17,23,5	; =, Bksp, Tab, Q, W, E
    60 0000FAB6 12141915090F        <1> 	db	18,20,25,21,9,15	; R, T, Y, U, I, O
    61 0000FABC 101B1D0AFF01        <1> 	db	16,27,29,10,-1,1	; P, [, ], Enter, Ctrl, A
    62 0000FAC2 13040607080A        <1> 	db	19,4,6,7,8,10		; S, D, F, G, H, J
    63 0000FAC8 0B0CFFFFFFFF        <1> 	db	11,12,-1,-1,-1,-1	; K, L, :, ', `, LShift
    64 0000FACE 1C1A18031602        <1> 	db	28,26,24,3,22,2		; Bkslash, Z, X, C, V, B
    65 0000FAD4 0E0DFFFFFFFF        <1> 	db	14,13,-1,-1,-1,-1	; N, M, ,, ., /, RShift
    66 0000FADA 96FF20FF            <1> 	db	150,-1,' ',-1		; *, ALT, Spc, CL
    67                              <1> 	;				;----- FUNCTIONS ------		
    68 0000FADE 5E5F60616263        <1> 	db 	94,95,96,97,98,99	; F1 - F6
    69 0000FAE4 64656667FFFF        <1> 	db	100,101,102,103,-1,-1	; F7 - F10, NL, SL
    70 0000FAEA 778D848E738F        <1> 	db	119,141,132,142,115,143	; Home, Up, PgUp, -, Left, Pad5
    71 0000FAF0 749075917692        <1> 	db 	116,144,117,145,118,146 ; Right, +, End, Down, PgDn, Ins
    72 0000FAF6 93FFFFFF898A        <1> 	db	147,-1,-1,-1,137,138	; Del, SysReq, Undef, WT, F11, F12
    73                              <1> 
    74                              <1> ;-----	TABLES FOR LOWER CASE ----------
    75 0000FAFC 1B3132333435363738- <1> K10:	db 	27,'1234567890-=',8,9
    75 0000FB05 39302D3D0809        <1>
    76 0000FB0B 71776572747975696F- <1> 	db 	'qwertyuiop[]',13,-1,'asdfghjkl;',39
    76 0000FB14 705B5D0DFF61736466- <1>
    76 0000FB1D 67686A6B6C3B27      <1>
    77 0000FB24 60FF5C7A786376626E- <1> 	db	96,-1,92,'zxcvbnm,./',-1,'*',-1,' ',-1
    77 0000FB2D 6D2C2E2FFF2AFF20FF  <1>
    78                              <1> ;-----	LC TABLE SCAN
    79 0000FB36 3B3C3D3E3F          <1> 	db	59,60,61,62,63		; BASE STATE OF F1 - F10
    80 0000FB3B 4041424344          <1> 	db	64,65,66,67,68
    81 0000FB40 FFFF                <1> 	db	-1,-1			; NL, SL
    82                              <1> 
    83                              <1> ;-----	KEYPAD TABLE
    84 0000FB42 474849FF4BFF        <1> K15:	db	71,72,73,-1,75,-1	; BASE STATE OF KEYPAD KEYS
    85 0000FB48 4DFF4F50515253      <1> 	db	77,-1,79,80,81,82,83
    86 0000FB4F FFFF5C8586          <1> 	db	-1,-1,92,133,134	; SysRq, Undef, WT, F11, F12
    87                              <1> 
    88                              <1> ;-----	TABLES FOR UPPER CASE ----------
    89 0000FB54 1B21402324255E262A- <1> K11:	db 	27,'!@#$%',94,'&*()_+',8,0
    89 0000FB5D 28295F2B0800        <1>
    90 0000FB63 51574552545955494F- <1> 	db 	'QWERTYUIOP{}',13,-1,'ASDFGHJKL:"'
    90 0000FB6C 507B7D0DFF41534446- <1>
    90 0000FB75 47484A4B4C3A22      <1>
    91 0000FB7C 7EFF7C5A584356424E- <1> 	db	126,-1,'|ZXCVBNM<>?',-1,'*',-1,' ',-1
    91 0000FB85 4D3C3E3FFF2AFF20FF  <1>
    92                              <1> ;-----	UC TABLE SCAN
    93 0000FB8E 5455565758          <1> K12:	db	84,85,86,87,88		; SHIFTED STATE OF F1 - F10
    94 0000FB93 595A5B5C5D          <1> 	db	89,90,91,92,93
    95 0000FB98 FFFF                <1> 	db	-1,-1			; NL, SL
    96                              <1> 
    97                              <1> ;-----	NUM STATE TABLE
    98 0000FB9A 3738392D3435362B31- <1> K14:	db 	'789-456+1230.'		; NUMLOCK STATE OF KEYPAD KEYS
    98 0000FBA3 3233302E            <1>
    99                              <1> 	;
   100 0000FBA7 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 0000FBAC 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 0000FBAD 00                  <1> KB_FLAG		db	0		; KEYBOARD SHIFT STATE AND STATUS FLAGS
   118 0000FBAE 00                  <1> KB_FLAG_1	db	0		; SECOND BYTE OF KEYBOARD STATUS
   119 0000FBAF 00                  <1> KB_FLAG_2	db	0		; KEYBOARD LED FLAGS
   120 0000FBB0 00                  <1> KB_FLAG_3	db	0		; KEYBOARD MODE STATE AND TYPE FLAGS
   121 0000FBB1 00                  <1> ALT_INPUT	db	0		; STORAGE FOR ALTERNATE KEY PAD ENTRY
   122 0000FBB2 [C2FB0000]          <1> BUFFER_START	dd	KB_BUFFER 	; OFFSET OF KEYBOARD BUFFER START
   123 0000FBB6 [E2FB0000]          <1> BUFFER_END	dd	KB_BUFFER + 32	; OFFSET OF END OF BUFFER
   124 0000FBBA [C2FB0000]          <1> BUFFER_HEAD	dd	KB_BUFFER 	; POINTER TO HEAD OF KEYBOARD BUFFER
   125 0000FBBE [C2FB0000]          <1> BUFFER_TAIL	dd	KB_BUFFER 	; POINTER TO TAIL OF KEYBOARD BUFFER
   126                              <1> ; ------	HEAD = TAIL	INDICATES THAT THE BUFFER IS EMPTY
   127 0000FBC2 0000<rept>          <1> KB_BUFFER	times	16 dw 0		; ROOM FOR 16 SCAN CODE ENTRIES
   128                              <1> 
   129                              <1> ; /// End Of KEYBOARD DATA ///
  2299                                  %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 0000FBE2 03                  <1> CRT_MODE:	db	3	; CURRENT DISPLAY MODE (TYPE)
    29 0000FBE3 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 0000FBE4 50                  <1> CRT_COLS:	db	80	; Number of columns
    52                              <1> 
    53                              <1> ; 01/07/2016
    54 0000FBE5 00                  <1> CRT_PALETTE:	db 	0	; Current palette setting
    55                              <1> 
    56                              <1> ; 03/07/2016
    57 0000FBE6 10                  <1> CHAR_HEIGHT:	db	16	; Default character height
    58 0000FBE7 60                  <1> VGA_VIDEO_CTL:	db	60h	; ROM BIOS DATA AREA Offset 87h
    59 0000FBE8 F9                  <1> VGA_SWITCHES:	db 	0F9h	; Feature Bit Switches (the basic screen)
    60 0000FBE9 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 0000FBEA 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 0000FBEB 0707070707070707    <1> 	db	07h, 07h, 07h, 07h, 07h, 07h, 07h, 07h
    77                              <1> ; 30/01/2016
    78                              <1> vmode:
    79 0000FBF3 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 0000FBFB 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 0000FBFD 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 0000FBFE 0302010007040506    <1> 	db 	03h, 02h, 01h, 00h, 07h, 04h, 05h, 06h
    96                              <1> vga_g_modes: ; 31/07/2016
    97 0000FC06 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 0000FC0E [6EFC0000]          <1> 	dd	vga_mode_03h
   104 0000FC12 [6EFC0000]          <1> 	dd	vga_mode_03h ; mode 02h -> mode 03h 
   105 0000FC16 [AEFC0000]          <1> 	dd	vga_mode_01h
   106 0000FC1A [AEFC0000]          <1> 	dd	vga_mode_01h ; mode 00h -> mode 01h
   107                              <1> 	;dd	vga_mode_07h
   108 0000FC1E [6EFC0000]          <1> 	dd	vga_mode_03h ; mode 07h -> mode 03h
   109 0000FC22 [EEFC0000]          <1> 	dd	vga_mode_04h
   110 0000FC26 [EEFC0000]          <1> 	dd	vga_mode_04h ; mode 05h -> mode 04h	
   111 0000FC2A [2EFD0000]          <1> 	dd	vga_mode_06h
   112 0000FC2E [6EFD0000]          <1> 	dd	vga_mode_13h
   113 0000FC32 [AEFD0000]          <1> 	dd	vga_mode_F0h
   114 0000FC36 [EEFD0000]          <1> 	dd	vga_mode_12h
   115 0000FC3A [2EFE0000]          <1> 	dd	vga_mode_6Ah
   116 0000FC3E [6EFE0000]          <1> 	dd	vga_mode_0Dh
   117 0000FC42 [AEFE0000]          <1> 	dd	vga_mode_0Eh
   118 0000FC46 [EEFE0000]          <1> 	dd	vga_mode_10h
   119 0000FC4A [2EFF0000]          <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 0000FC4E 0000000000020202    <1> 	db	CTEXT, CTEXT, CTEXT, CTEXT, MTEXT, CGA, CGA, CGA
   132                              <1> vga_g_memmodel: ; 31/07/2016
   133 0000FC56 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 0000FC5E 020202020001010103- <1> 	db	2, 2, 2, 2, 0, 1, 1, 1, 3, 3, 2, 2, 1, 1, 2, 2
   139 0000FC67 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 0000FC6E 5018100010          <1>  	db	80, 24, 16, 00h, 10h ; tw, th-1, ch, slength (5)
   154 0000FC73 00030002            <1>  	db	00h, 03h, 00h, 02h ; sequ regs (4)
   155 0000FC77 67                  <1>  	db	67h	; misc reg (1)
   156 0000FC78 5F4F50825581BF1F    <1>  	db	5Fh, 4Fh, 50h, 82h, 55h, 81h, 0BFh, 1Fh
   157 0000FC80 004F                <1>  	db	00h, 4Fh
   158                              <1> vga_p_cm_pos equ $ - vga_mode_03h
   159 0000FC82 0D0E00000000        <1> 	db	0Dh, 0Eh, 00h, 00h, 00h, 00h
   160 0000FC88 9C8E8F281F96B9A3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 1Fh, 96h, 0B9h, 0A3h
   161 0000FC90 FF                  <1> 	db	0FFh	; crtc_regs (25)
   162 0000FC91 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   163 0000FC99 38393A3B3C3D3E3F    <1>  	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   164 0000FCA1 0C000F08            <1>  	db	0Ch, 00h, 0Fh, 08h  ; actl regs (20)
   165 0000FCA5 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 0000FCAE 2818100008          <1> 	db	40, 24, 16, 00h, 08h ; tw, th-1, ch, slength
   168 0000FCB3 08030002            <1> 	db	08h, 03h, 00h, 02h  ; sequ regs
   169 0000FCB7 67                  <1> 	db	67h	; misc reg
   170 0000FCB8 2D2728902BA0BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 0A0h, 0BFh, 1Fh
   171 0000FCC0 004F0D0E00000000    <1> 	db	00h, 4Fh, 0Dh, 0Eh, 00h, 00h, 00h, 00h
   172 0000FCC8 9C8E8F141F96B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 1Fh, 96h, 0B9h, 0A3h
   173 0000FCD0 FF                  <1> 	db	0FFh	; crtc_regs
   174 0000FCD1 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   175 0000FCD9 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   176 0000FCE1 0C000F08            <1> 	db	0Ch, 00h, 0Fh, 08h  ; actl regs
   177 0000FCE5 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 0000FCEE 2818080008          <1> 	db	40, 24, 8, 00h, 08h   ; tw, th-1, ch, slength
   192 0000FCF3 09030002            <1> 	db	09h, 03h, 00h, 02h ; sequ regs
   193 0000FCF7 63                  <1> 	db	63h	; misc reg
   194 0000FCF8 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   195 0000FD00 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   196 0000FD08 9C8E8F140096B9A2    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0A2h
   197 0000FD10 FF                  <1> 	db	0FFh	; crtc_regs
   198 0000FD11 0013151702040607    <1> 	db	00h, 13h, 15h, 17h, 02h, 04h, 06h, 07h
   199 0000FD19 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   200 0000FD21 01000300            <1> 	db	01h, 00h, 03h, 00h ; actl regs
   201 0000FD25 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 0000FD2E 5018080010          <1> 	db	80, 24, 8, 00h, 10h   ;	tw, th-1, ch, slength
   204 0000FD33 01010006            <1> 	db	01h, 01h, 00h, 06h ; sequ regs
   205 0000FD37 63                  <1> 	db	63h	; misc reg
   206 0000FD38 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   207 0000FD40 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   208 0000FD48 9C8E8F280096B9C2    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0C2h
   209 0000FD50 FF                  <1> 	db	0FFh	; crtc regs
   210 0000FD51 0017171717171717    <1> 	db	00h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   211 0000FD59 1717171717171717    <1> 	db	17h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   212 0000FD61 01000100            <1> 	db	01h, 00h, 01, 00h  ; actl regs
   213 0000FD65 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 0000FD6E 2818080000          <1> 	db 	40, 24, 8, 0, 0	; tw, th-1, ch, slength (5)
   216 0000FD73 010F000E            <1> 	db	01h, 0Fh, 00h, 0Eh ; sequ regs (4)
   217 0000FD77 63                  <1> 	db	63h	; misc reg (1)
   218 0000FD78 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh 
   219 0000FD80 0041000000000000    <1>  	db 	00h, 41h, 00h, 00h, 00h, 00h, 00h, 00h
   220 0000FD88 9C8E8F284096B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 40h, 96h, 0B9h, 0A3h
   221 0000FD90 FF                  <1> 	db	0FFh	; crtc regs (25)
   222 0000FD91 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   223 0000FD99 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   224 0000FDA1 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs (20)
   225 0000FDA5 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 0000FDAE 2818080000          <1> 	db 	40, 24, 8, 0, 0	; tw, th-1, ch, slength
   229 0000FDB3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   230 0000FDB7 E3                  <1> 	db	0E3h	; misc reg
   231 0000FDB8 5F4F508254800D3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Dh, 3Eh 
   232 0000FDC0 0041000000000000    <1>  	db 	00h, 41h, 00h, 00h, 00h, 00h, 00h, 00h
   233 0000FDC8 EAACDF2800E706E3    <1> 	db	0EAh, 0ACh, 0DFh, 28h, 00h, 0E7h, 06h, 0E3h
   234 0000FDD0 FF                  <1> 	db	0FFh	; crtc regs (25)
   235 0000FDD1 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   236 0000FDD9 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   237 0000FDE1 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs
   238 0000FDE5 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 0000FDEE 501D100000          <1>  	db 	80, 29, 16, 0, 0 ; tw, th-1, ch, slength
   241 0000FDF3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   242 0000FDF7 E3                  <1> 	db 	0E3h	; misc reg
   243 0000FDF8 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   244 0000FE00 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   245 0000FE08 EA8CDF2800E704E3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   246 0000FE10 FF                  <1> 	db	0FFh	; crtc regs
   247 0000FE11 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   248 0000FE19 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   249 0000FE21 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   250 0000FE25 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 0000FE2E 6424100000          <1>  	db 	100, 36, 16, 0, 0 ; tw, th-1, ch, slength
   253 0000FE33 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   254 0000FE37 E3                  <1> 	db 	0E3h	; misc reg
   255 0000FE38 7F6363836B1B72F0    <1> 	db	7Fh, 63h, 63h, 83h, 6Bh, 1Bh, 72h, 0F0h
   256 0000FE40 0060000000000000    <1> 	db	00h, 60h, 00h, 00h, 00h, 00h, 00h, 00h
   257 0000FE48 598D5732005773E3    <1>  	db	59h, 8Dh, 57h, 32h, 00h, 57h, 73h, 0E3h
   258 0000FE50 FF                  <1> 	db	0FFh	; crtc regs
   259 0000FE51 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   260 0000FE59 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   261 0000FE61 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   262 0000FE65 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 0000FE6E 2818080020          <1>  	db 	40, 24, 8, 0, 20h ; tw, th-1, ch, slength
   265 0000FE73 090F0006            <1> 	db	09h, 0Fh, 00h, 06h ; sequ regs
   266 0000FE77 63                  <1> 	db 	63h	; misc reg
   267 0000FE78 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   268 0000FE80 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   269 0000FE88 9C8E8F140096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0E3h
   270 0000FE90 FF                  <1> 	db	0FFh	; crtc regs
   271 0000FE91 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   272 0000FE99 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   273 0000FEA1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   274 0000FEA5 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 0000FEAE 5018080040          <1>  	db 	80, 24, 8, 0, 40h ; tw, th-1, ch, slength
   277 0000FEB3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   278 0000FEB7 63                  <1> 	db 	63h	; misc reg
   279 0000FEB8 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   280 0000FEC0 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   281 0000FEC8 9C8E8F280096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0E3h
   282 0000FED0 FF                  <1> 	db	0FFh	; crtc regs
   283 0000FED1 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   284 0000FED9 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   285 0000FEE1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   286 0000FEE5 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 0000FEEE 50180E0080          <1>  	db 	80, 24, 14, 0, 80h ; tw, th-1, ch, slength
   289 0000FEF3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   290 0000FEF7 A3                  <1> 	db 	0A3h	; misc reg
   291 0000FEF8 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   292 0000FF00 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   293 0000FF08 83855D280F63BAE3    <1>  	db	83h, 85h, 5Dh, 28h, 0Fh, 63h, 0BAh, 0E3h
   294 0000FF10 FF                  <1> 	db	0FFh	; crtc regs
   295 0000FF11 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   296 0000FF19 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   297 0000FF21 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   298 0000FF25 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 0000FF2E 501D100000          <1>  	db 	80, 29, 16, 0, 0   ; tw, th-1, ch, slength
   301 0000FF33 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   302 0000FF37 E3                  <1> 	db 	0E3h	; misc reg
   303 0000FF38 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   304 0000FF40 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   305 0000FF48 EA8CDF2800E704E3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   306 0000FF50 FF                  <1> 	db	0FFh	; crtc regs
   307 0000FF51 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   308 0000FF59 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   309 0000FF61 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   310 0000FF65 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 ///
  2300                                  ;%include 'diskdata.s'	; DISK (BIOS) DATA (initialized)
  2301                                  ;;;
  2302                                  
  2303                                  ; 27/08/2014
  2304                                  scr_row:
  2305 0000FF6E E0810B00                	dd 0B8000h + 0A0h + 0A0h + 0A0h ; Row 3
  2306                                  scr_col:
  2307 0000FF72 00000000                	dd 0
  2308                                  
  2309 0000FF76 90<rept>                Align 4
  2310                                  	; 15/04/2016
  2311                                  	; TRDOS 386 (TRDOS v2.0)
  2312                                  
  2313                                  	; 21/08/2014
  2314                                  ilist:
  2315                                  	;times 	32 dd cpu_except ; INT 0 to INT 1Fh
  2316                                  	;
  2317                                  	; Exception list
  2318                                  	; 25/08/2014	
  2319 0000FF78 [08090000]              	dd	exc0	; 0h,  Divide-by-zero Error
  2320 0000FF7C [0F090000]              	dd	exc1	
  2321 0000FF80 [16090000]              	dd 	exc2	
  2322 0000FF84 [1D090000]              	dd	exc3	
  2323 0000FF88 [21090000]              	dd	exc4	
  2324 0000FF8C [25090000]              	dd	exc5	
  2325 0000FF90 [29090000]              	dd 	exc6	; 06h,  Invalid Opcode
  2326 0000FF94 [2D090000]              	dd	exc7	
  2327 0000FF98 [31090000]              	dd	exc8	
  2328 0000FF9C [35090000]              	dd	exc9	
  2329 0000FFA0 [39090000]              	dd 	exc10	
  2330 0000FFA4 [3D090000]              	dd	exc11
  2331 0000FFA8 [41090000]              	dd	exc12
  2332 0000FFAC [45090000]              	dd	exc13	; 0Dh, General Protection Fault
  2333 0000FFB0 [49090000]              	dd 	exc14	; 0Eh, Page Fault
  2334 0000FFB4 [4D090000]              	dd	exc15
  2335 0000FFB8 [51090000]              	dd	exc16
  2336 0000FFBC [55090000]              	dd	exc17
  2337 0000FFC0 [59090000]              	dd 	exc18
  2338 0000FFC4 [5D090000]              	dd	exc19
  2339 0000FFC8 [61090000]              	dd 	exc20
  2340 0000FFCC [65090000]              	dd	exc21
  2341 0000FFD0 [69090000]              	dd	exc22
  2342 0000FFD4 [6D090000]              	dd	exc23
  2343 0000FFD8 [71090000]              	dd 	exc24
  2344 0000FFDC [75090000]              	dd	exc25
  2345 0000FFE0 [79090000]              	dd	exc26
  2346 0000FFE4 [7D090000]              	dd	exc27
  2347 0000FFE8 [81090000]              	dd 	exc28
  2348 0000FFEC [85090000]              	dd	exc29
  2349 0000FFF0 [89090000]              	dd 	exc30
  2350 0000FFF4 [8D090000]              	dd	exc31
  2351                                  	; Interrupt list
  2352 0000FFF8 [85060000]              	dd	timer_int	; INT 20h
  2353                                  		;dd	irq0	
  2354 0000FFFC [F00D0000]              	dd	kb_int		; 24/01/2016
  2355                                  		;dd	irq1
  2356 00010000 [5E080000]              	dd	irq2
  2357                                  		; COM2 int
  2358 00010004 [62080000]              	dd	irq3
  2359                                  		; COM1 int
  2360 00010008 [6D080000]              	dd	irq4
  2361 0001000C [78080000]              	dd	irq5
  2362                                  ;DISKETTE_INT: ;06/02/2015
  2363 00010010 [A1410000]              	dd	fdc_int		; 16/02/2015, IRQ 6 handler	
  2364                                  		;dd	irq6
  2365                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  2366                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  2367 00010014 [E70B0000]              	dd	default_irq7	; 25/02/2015
  2368                                  		;dd	irq7
  2369                                  ; Real Time Clock Interrupt
  2370 00010018 [E7070000]              	dd	rtc_int		; 23/02/2015, IRQ 8 handler
  2371                                  		;dd	irq8	; INT 28h
  2372 0001001C [88080000]              	dd	irq9
  2373 00010020 [8C080000]              	dd	irq10
  2374 00010024 [90080000]              	dd	irq11
  2375 00010028 [94080000]              	dd	irq12
  2376 0001002C [98080000]              	dd	irq13
  2377                                  ;HDISK_INT1:  ;06/02/2015 	
  2378 00010030 [1E4B0000]              	dd	hdc1_int 	; 21/02/2015, IRQ 14 handler		
  2379                                  		;dd	irq14
  2380                                  ;HDISK_INT2:  ;06/02/2015
  2381 00010034 [454B0000]              	dd	hdc2_int 	; 21/02/2015, IRQ 15 handler		
  2382                                  		;dd	irq15	; INT 2Fh
  2383                                  		; 14/08/2015
  2384                                  	;dd	sysent		; INT 30h (system calls)
  2385                                  
  2386                                  	; 15/04/2016
  2387                                  	; TRDOS 386(TRDOS v2.0) Software Interrupts
  2388                                  
  2389 00010038 [95000100]              	dd	int30h		; Reserved for
  2390                                  				; !!! Retro UNIX (RUNIX) !!!
  2391                                  				; !!! SINGLIX !!! System Calls
  2392 0001003C [E3140000]              	dd	int31h		; Video BIOS (IBM PC/AT, Int 10h)
  2393 00010040 [0F0C0000]              	dd	int32h		; Keyboard Functions (IBM PC/AT, Int 16h)
  2394 00010044 [58420000]              	dd	int33h		; DISK I/O (IBM PC/AT, Int 13h)
  2395 00010048 [14EB0000]              	dd	int34h		; #IOCTL# (I/O port access support for ring 3)
  2396 0001004C [B6580000]              	dd	int35h		; Time/Date Functions (IBM PC/AT, Int 1Ah)
  2397 00010050 [9B0A0000]              	dd	ignore_int	; INT 36h : Timer Functions	
  2398 00010054 [9B0A0000]              	dd	ignore_int	; INT 37h	
  2399 00010058 [9B0A0000]              	dd	ignore_int	; INT 38h
  2400 0001005C [9B0A0000]              	dd	ignore_int	; INT 39h
  2401 00010060 [9B0A0000]              	dd	ignore_int	; INT 3Ah	
  2402 00010064 [9B0A0000]              	dd	ignore_int	; INT 3Bh
  2403 00010068 [9B0A0000]              	dd	ignore_int	; INT 3Ch
  2404 0001006C [9B0A0000]              	dd	ignore_int	; INT 3Dh	
  2405 00010070 [9B0A0000]              	dd	ignore_int	; INT 3Eh
  2406 00010074 [9B0A0000]              	dd	ignore_int	; INT 3Fh
  2407 00010078 [75BC0000]              	dd	sysent		; INT 40h : !!! TRDOS 386 System Calls !!!
  2408                                  	;dd	ignore_int
  2409 0001007C 00000000                	dd	0
  2410                                  
  2411                                  ; 20/08/2014
  2412                                    ; /* This is the default interrupt "handler" :-) */ 
  2413                                    ; Linux v0.12 (head.s)
  2414                                  int_msg:
  2415 00010080 556E6B6E6F776E2069-     	db "Unknown interrupt ! ", 0
  2415 00010089 6E7465727275707420-
  2415 00010092 212000             
  2416                                  
  2417                                  ; 15/04/2016
  2418                                  ; TRDOS 386 (TRDOS v2.0)
  2419                                  
  2420                                  ; 29/04/2016
  2421                                  int30h:
  2422                                  trdos_isc_routine:
  2423                                  	; 02/05/2016
  2424                                  	; 01/05/2016
  2425                                  	; 29/04/2016
  2426                                  	; 18/04/2016
  2427                                  	; 15/04/2016 (TRDOS 386 = TRDOS v2.0)
  2428                                  	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
  2429                                  	; 03/02/2011 ('trdos_ifc_routine')
  2430                                  	;
  2431 00010095 8B1C24                  	mov	ebx, [esp] ; EIP (next)
  2432 00010098 83EB02                  	sub	ebx, 2 ; EIP (CD ##h)
  2433                                  
  2434 0001009B 89C1                    	mov	ecx, eax
  2435 0001009D 8A4301                  	mov	al, [ebx+1] ; CDh ##h
  2436                                  
  2437 000100A0 66BA1000                	mov	dx, KDATA
  2438 000100A4 8EDA                    	mov	ds, dx
  2439 000100A6 8EC2                    	mov	es, dx
  2440                                  
  2441 000100A8 FC                      	cld
  2442 000100A9 8B15[A8330100]          	mov	edx, [k_page_dir]
  2443 000100AF 0F22DA                  	mov	cr3, edx
  2444                                  
  2445 000100B2 E80332FFFF              	call	bytetohex
  2446 000100B7 66A3[07F70000]          	mov	[int_num_str], ax
  2447                                  
  2448 000100BD 89D8                    	mov	eax, ebx ; EIP
  2449 000100BF E83632FFFF              	call	dwordtohex
  2450 000100C4 8915[23F70000]          	mov	[eip_str], edx
  2451 000100CA A3[27F70000]            	mov	[eip_str+4], eax
  2452                                  
  2453 000100CF 89C8                    	mov	eax, ecx
  2454 000100D1 E82432FFFF              	call	dwordtohex
  2455 000100D6 8915[12F70000]          	mov	[eax_str], edx
  2456 000100DC A3[16F70000]            	mov	[eax_str+4], eax 	
  2457                                  
  2458 000100E1 43                      	inc	ebx
  2459 000100E2 8A03                    	mov	al, [ebx] ; Interrupt number
  2460                                  
  2461                                  trdos_isc_handler:
  2462 000100E4 80FE30                  	cmp	dh, 30h ; Retro UNIX, SINGLIX System calls
  2463 000100E7 7507                    	jne	short trdos_usi_handler
  2464 000100E9 BE[A4F60000]            	mov	esi, isc_msg
  2465 000100EE EB05                    	jmp	short loc_write_inv_system_call_msg
  2466                                  
  2467                                  trdos_usi_handler:
  2468 000100F0 BE[BAF60000]            	mov	esi, usi_msg
  2469                                  
  2470                                  loc_write_inv_system_call_msg:
  2471 000100F5 E8775BFFFF              	call	print_msg
  2472                                  	; 29/04/2016
  2473 000100FA BE[F0F60000]            	mov	esi, inv_msg_for_trdos_v2
  2474 000100FF E86D5BFFFF              	call	print_msg
  2475                                  
  2476                                  loc_ifc_terminate_process:
  2477                                  	; u.uno = process number
  2478                                  	; 29/04/2016
  2479                                  
  2480                                  	; 02/05/2016
  2481 00010104 FE05[DB490100]          	inc	byte [sysflg] ; 0FFh -> 0
  2482                                  
  2483 0001010A B801000000              	mov	eax, 1
  2484 0001010F E9A5BDFFFF              	jmp	sysexit
  2485                                  
  2486                                  ; 07/03/2015
  2487                                  ; Temporary Code
  2488                                  display_disks:
  2489 00010114 803D[16FA0000]00        	cmp 	byte [fd0_type], 0
  2490 0001011B 7605                    	jna 	short ddsks1
  2491 0001011D E87D000000              	call	pdskm
  2492                                  ddsks1:
  2493 00010122 803D[17FA0000]00        	cmp	byte [fd1_type], 0
  2494 00010129 760C                    	jna	short ddsks2
  2495 0001012B C605[6F020100]31        	mov	byte [dskx], '1'
  2496 00010132 E868000000              	call	pdskm
  2497                                  ddsks2:
  2498 00010137 803D[18FA0000]00        	cmp	byte [hd0_type], 0
  2499 0001013E 7654                    	jna	short ddsk6
  2500 00010140 66C705[6D020100]68-     	mov	word [dsktype], 'hd'
  2500 00010148 64                 
  2501 00010149 C605[6F020100]30        	mov	byte [dskx], '0'
  2502 00010150 E84A000000              	call	pdskm
  2503                                  ddsks3:
  2504 00010155 803D[19FA0000]00        	cmp	byte [hd1_type], 0
  2505 0001015C 7636                    	jna	short ddsk6
  2506 0001015E C605[6F020100]31        	mov	byte [dskx], '1'
  2507 00010165 E835000000              	call	pdskm
  2508                                  ddsks4:
  2509 0001016A 803D[1AFA0000]00        	cmp	byte [hd2_type], 0
  2510 00010171 7621                    	jna	short ddsk6
  2511 00010173 C605[6F020100]32        	mov	byte [dskx], '2'
  2512 0001017A E820000000              	call	pdskm
  2513                                  ddsks5:
  2514 0001017F 803D[1BFA0000]00        	cmp	byte [hd3_type], 0
  2515 00010186 760C                    	jna	short ddsk6
  2516 00010188 C605[6F020100]33        	mov	byte [dskx], '3'
  2517 0001018F E80B000000              	call	pdskm
  2518                                  ddsk6:
  2519 00010194 BE[97020100]            	mov	esi, nextline
  2520 00010199 E806000000              	call	pdskml
  2521                                  pdskm_ok:
  2522 0001019E C3                      	retn
  2523                                  pdskm:
  2524 0001019F BE[6B020100]            	mov	esi, dsk_ready_msg
  2525                                  pdskml:	
  2526 000101A4 AC                      	lodsb
  2527 000101A5 08C0                    	or	al, al
  2528 000101A7 74F5                    	jz	short pdskm_ok
  2529 000101A9 56                      	push	esi
  2530                                  	; 13/05/2016
  2531 000101AA BB07000000                      mov     ebx, 7  ; Black background, 
  2532                                  			; light gray forecolor
  2533                                  			; Video page 0 (bh=0)
  2534 000101AF E8EF1AFFFF              	call	_write_tty
  2535 000101B4 5E                      	pop	esi
  2536 000101B5 EBED                    	jmp	short pdskml
  2537                                  
  2538 000101B7 90                      Align 2
  2539                                  	; 21/08/2014
  2540                                  exc_msg:
  2541 000101B8 435055206578636570-     	db "CPU exception ! "
  2541 000101C1 74696F6E202120     
  2542                                  excnstr: 		; 25/08/2014
  2543 000101C8 3F3F68202045495020-     	db "??h", "  EIP : "
  2543 000101D1 3A20               
  2544                                  EIPstr: ; 29/08/2014
  2545 000101D3 00<rept>                	times 12 db 0
  2546                                  
  2547                                  	; 23/02/2015
  2548                                  	; 25/08/2014
  2549                                  ;scounter:
  2550                                  ;	db 5
  2551                                  ;	db 19
  2552                                  
  2553                                  ; 06/11/2014
  2554                                  ; Memory Information message
  2555                                  ; 14/08/2015
  2556                                  msg_memory_info:
  2557 000101DF 07                      	db	07h
  2558 000101E0 0D0A                    	db	0Dh, 0Ah
  2559                                  	;db 	"MEMORY ALLOCATION INFO", 0Dh, 0Ah, 0Dh, 0Ah
  2560 000101E2 546F74616C206D656D-     	db	"Total memory : "
  2560 000101EB 6F7279203A20       
  2561                                  mem_total_b_str: ; 10 digits
  2562 000101F1 303030303030303030-     	db	"0000000000 bytes", 0Dh, 0Ah
  2562 000101FA 302062797465730D0A 
  2563 00010203 202020202020202020-     	db	"               ", 20h, 20h, 20h
  2563 0001020C 202020202020202020 
  2564                                  mem_total_p_str: ; 7 digits
  2565 00010215 303030303030302070-     	db	"0000000 pages", 0Dh, 0Ah
  2565 0001021E 616765730D0A       
  2566 00010224 0D0A                    	db 	0Dh, 0Ah
  2567 00010226 46726565206D656D6F-     	db	"Free memory  : "
  2567 0001022F 727920203A20       
  2568                                  free_mem_b_str:  ; 10 digits
  2569 00010235 3F3F3F3F3F3F3F3F3F-     	db	"?????????? bytes", 0Dh, 0Ah
  2569 0001023E 3F2062797465730D0A 
  2570 00010247 202020202020202020-     	db	"               ", 20h, 20h, 20h
  2570 00010250 202020202020202020 
  2571                                  free_mem_p_str:  ; 7 digits
  2572 00010259 3F3F3F3F3F3F3F2070-     	db	"??????? pages", 0Dh, 0Ah
  2572 00010262 616765730D0A       
  2573 00010268 0D0A00                  	db	0Dh, 0Ah, 0
  2574                                  
  2575                                  dsk_ready_msg:
  2576 0001026B 0D0A                    	db 	0Dh, 0Ah
  2577                                  dsktype:
  2578 0001026D 6664                    	db	'fd'
  2579                                  dskx:
  2580 0001026F 30                      	db	'0'
  2581 00010270 20                      	db	20h
  2582 00010271 697320524541445920-     	db 	'is READY ...'
  2582 0001027A 2E2E2E             
  2583 0001027D 00                      	db 	0
  2584                                  
  2585                                  setup_error_msg:
  2586 0001027E 0D0A                    	db 0Dh, 0Ah
  2587 00010280 4469736B2053657475-     	db 'Disk Setup Error !' 
  2587 00010289 70204572726F722021 
  2588 00010292 0D0A00                  	db 0Dh, 0Ah,0
  2589                                  
  2590                                  next2line: ; 08/02/2016
  2591 00010295 0D0A                    	db	0Dh, 0Ah
  2592                                  nextline:
  2593 00010297 0D0A00                  	db 	0Dh, 0Ah, 0
  2594                                  
  2595                                  ; KERNEL - SYSINIT Messages
  2596                                  ; 24/08/2015
  2597                                  ; 13/04/2015 - (Retro UNIX 386 v1 Beginning)
  2598                                  ; 14/07/2013
  2599                                  ;kernel_init_err_msg:
  2600                                  ;	db 0Dh, 0Ah
  2601                                  ;	db 07h
  2602                                  ;	db 'Kernel initialization ERROR !'
  2603                                  ;	db 0Dh, 0Ah, 0 
  2604                                  
  2605                                  ;welcome_msg: 
  2606                                  ;	db 0Dh, 0Ah
  2607                                  ;	db 07h
  2608                                  ;	db 'Welcome to TRDOS 386 Operating System !'
  2609                                  ;	db 0Dh, 0Ah
  2610                                  ;	db 'by Erdogan Tan - 20/02/2017 (v2.0.0)'
  2611                                  ;	db 0Dh, 0Ah, 0
  2612                                  
  2613                                  panic_msg:
  2614 0001029A 0D0A07                  	db 0Dh, 0Ah, 07h
  2615 0001029D 4552524F523A204B65-     	db 'ERROR: Kernel Panic !'
  2615 000102A6 726E656C2050616E69-
  2615 000102AF 632021             
  2616 000102B2 0D0A00                  	db 0Dh, 0Ah, 0
  2617                                  
  2618                                  ;msgl_drv_not_ready: 
  2619                                  ;	db 07h, 0Dh, 0Ah
  2620                                  ;       db 'Drive not ready or read error !'
  2621                                  ;       db 0Dh, 0Ah, 0
  2622                                  
  2623                                  starting_msg:
  2624 000102B5 5475726B6973682052-     	db "Turkish Rational DOS v2.0 [20/02/2017] ...", 0
  2624 000102BE 6174696F6E616C2044-
  2624 000102C7 4F532076322E30205B-
  2624 000102D0 32302F30322F323031-
  2624 000102D9 375D202E2E2E00     
  2625                                  NextLine:
  2626 000102E0 0D0A00                  	db 0Dh, 0Ah, 0
  2627                                  
  2628 000102E3 90                      align 4
  2629                                  
  2630                                  %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 000102E4 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    28 000102ED 00000000000000      <1>
    29 000102F4 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    29 000102FD 2A2A2A2A2A2A2A      <1>
    30 00010304 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    30 0001030D 2A2A2A2A2A2A2A      <1>
    31 00010314 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    31 0001031D 2A2A2A2A2A2A2A      <1>
    32 00010324 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    32 0001032D 3F3F3F3F3F3F3F      <1>
    33 00010334 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    33 0001033D 3F3F3F3F3F3F3F      <1>
    34 00010344 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    34 0001034D 00000000000000      <1>
    35 00010354 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    35 0001035D 2A2A2A2A2A2A2A      <1>
    36 00010364 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    36 0001036D 2A2A2A2A2A2A2A      <1>
    37 00010374 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    37 0001037D 2A2A2A2A2A2A2A      <1>
    38 00010384 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    38 0001038D 3F3F3F3F3F3F3F      <1>
    39 00010394 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    39 0001039D 3F3F3F3F3F3F3F      <1>
    40                              <1> palette1:
    41 000103A4 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    41 000103AD 002A2A2A00002A      <1>
    42 000103B4 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    42 000103BD 000000002A002A      <1>
    43 000103C4 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    43 000103CD 2A2A15002A2A2A      <1>
    44 000103D4 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    44 000103DD 153F3F3F15153F      <1>
    45 000103E4 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    45 000103ED 151515153F153F      <1>
    46 000103F4 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    46 000103FD 3F3F3F153F3F3F      <1>
    47 00010404 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    47 0001040D 002A2A2A00002A      <1>
    48 00010414 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    48 0001041D 000000002A002A      <1>
    49 00010424 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    49 0001042D 2A2A15002A2A2A      <1>
    50 00010434 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    50 0001043D 153F3F3F15153F      <1>
    51 00010444 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    51 0001044D 151515153F153F      <1>
    52 00010454 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    52 0001045D 3F3F3F153F3F3F      <1>
    53                              <1> palette2:
    54 00010464 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    54 0001046D 002A2A2A00002A      <1>
    55 00010474 002A2A2A002A2A2A00- <1>     db  000h, 02ah, 02ah, 02ah, 000h, 02ah, 02ah, 02ah, 000h, 000h, 015h, 000h, 000h, 03fh, 000h, 02ah
    55 0001047D 001500003F002A      <1>
    56 00010484 15002A3F2A00152A00- <1>     db  015h, 000h, 02ah, 03fh, 02ah, 000h, 015h, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 02ah, 02ah, 03fh
    56 0001048D 3F2A2A152A2A3F      <1>
    57 00010494 00150000152A003F00- <1>     db  000h, 015h, 000h, 000h, 015h, 02ah, 000h, 03fh, 000h, 000h, 03fh, 02ah, 02ah, 015h, 000h, 02ah
    57 0001049D 003F2A2A15002A      <1>
    58 000104A4 152A2A3F002A3F2A00- <1>     db  015h, 02ah, 02ah, 03fh, 000h, 02ah, 03fh, 02ah, 000h, 015h, 015h, 000h, 015h, 03fh, 000h, 03fh
    58 000104AD 151500153F003F      <1>
    59 000104B4 15003F3F2A15152A15- <1>     db  015h, 000h, 03fh, 03fh, 02ah, 015h, 015h, 02ah, 015h, 03fh, 02ah, 03fh, 015h, 02ah, 03fh, 03fh
    59 000104BD 3F2A3F152A3F3F      <1>
    60 000104C4 15000015002A152A00- <1>     db  015h, 000h, 000h, 015h, 000h, 02ah, 015h, 02ah, 000h, 015h, 02ah, 02ah, 03fh, 000h, 000h, 03fh
    60 000104CD 152A2A3F00003F      <1>
    61 000104D4 002A3F2A003F2A2A15- <1>     db  000h, 02ah, 03fh, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 000h, 015h, 015h, 000h, 03fh, 015h, 02ah
    61 000104DD 001515003F152A      <1>
    62 000104E4 15152A3F3F00153F00- <1>     db  015h, 015h, 02ah, 03fh, 03fh, 000h, 015h, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 03fh, 02ah, 03fh
    62 000104ED 3F3F2A153F2A3F      <1>
    63 000104F4 15150015152A153F00- <1>     db  015h, 015h, 000h, 015h, 015h, 02ah, 015h, 03fh, 000h, 015h, 03fh, 02ah, 03fh, 015h, 000h, 03fh
    63 000104FD 153F2A3F15003F      <1>
    64 00010504 152A3F3F003F3F2A15- <1>     db  015h, 02ah, 03fh, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    64 0001050D 151515153F153F      <1>
    65 00010514 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    65 0001051D 3F3F3F153F3F3F      <1>
    66                              <1> palette3:
    67 00010524 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    67 0001052D 002A2A2A00002A      <1>
    68 00010534 002A2A15002A2A2A15- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    68 0001053D 151515153F153F      <1>
    69 00010544 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    69 0001054D 3F3F3F153F3F3F      <1>
    70 00010554 000000050505080808- <1>     db  000h, 000h, 000h, 005h, 005h, 005h, 008h, 008h, 008h, 00bh, 00bh, 00bh, 00eh, 00eh, 00eh, 011h
    70 0001055D 0B0B0B0E0E0E11      <1>
    71 00010564 11111414141818181C- <1>     db  011h, 011h, 014h, 014h, 014h, 018h, 018h, 018h, 01ch, 01ch, 01ch, 020h, 020h, 020h, 024h, 024h
    71 0001056D 1C1C2020202424      <1>
    72 00010574 242828282D2D2D3232- <1>     db  024h, 028h, 028h, 028h, 02dh, 02dh, 02dh, 032h, 032h, 032h, 038h, 038h, 038h, 03fh, 03fh, 03fh
    72 0001057D 323838383F3F3F      <1>
    73 00010584 00003F10003F1F003F- <1>     db  000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 03fh, 03fh
    73 0001058D 2F003F3F003F3F      <1>
    74 00010594 002F3F001F3F00103F- <1>     db  000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh
    74 0001059D 00003F10003F1F      <1>
    75 000105A4 003F2F003F3F002F3F- <1>     db  000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h
    75 000105AD 001F3F00103F00      <1>
    76 000105B4 003F00003F10003F1F- <1>     db  000h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h
    76 000105BD 003F2F003F3F00      <1>
    77 000105C4 2F3F001F3F00103F1F- <1>     db  02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh
    77 000105CD 1F3F271F3F2F1F      <1>
    78 000105D4 3F371F3F3F1F3F3F1F- <1>     db  03fh, 037h, 01fh, 03fh, 03fh, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h
    78 000105DD 373F1F2F3F1F27      <1>
    79 000105E4 3F1F1F3F271F3F2F1F- <1>     db  03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h
    79 000105ED 3F371F3F3F1F37      <1>
    80 000105F4 3F1F2F3F1F273F1F1F- <1>     db  03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh, 01fh, 01fh, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh
    80 000105FD 3F1F1F3F271F3F      <1>
    81 00010604 2F1F3F371F3F3F1F37- <1>     db  02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh
    81 0001060D 3F1F2F3F1F273F      <1>
    82 00010614 2D2D3F312D3F362D3F- <1>     db  02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03fh, 03fh
    82 0001061D 3A2D3F3F2D3F3F      <1>
    83 00010624 2D3A3F2D363F2D313F- <1>     db  02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h
    83 0001062D 2D2D3F312D3F36      <1>
    84 00010634 2D3F3A2D3F3F2D3A3F- <1>     db  02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh
    84 0001063D 2D363F2D313F2D      <1>
    85 00010644 2D3F2D2D3F312D3F36- <1>     db  02dh, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh
    85 0001064D 2D3F3A2D3F3F2D      <1>
    86 00010654 3A3F2D363F2D313F00- <1>     db  03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h
    86 0001065D 001C07001C0E00      <1>
    87 00010664 1C15001C1C001C1C00- <1>     db  01ch, 015h, 000h, 01ch, 01ch, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h
    87 0001066D 151C000E1C0007      <1>
    88 00010674 1C00001C07001C0E00- <1>     db  01ch, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h
    88 0001067D 1C15001C1C0015      <1>
    89 00010684 1C000E1C00071C0000- <1>     db  01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch, 000h, 000h, 01ch, 000h, 000h, 01ch, 007h, 000h, 01ch
    89 0001068D 1C00001C07001C      <1>
    90 00010694 0E001C15001C1C0015- <1>     db  00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch
    90 0001069D 1C000E1C00071C      <1>
    91 000106A4 0E0E1C110E1C150E1C- <1>     db  00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 01ch, 01ch
    91 000106AD 180E1C1C0E1C1C      <1>
    92 000106B4 0E181C0E151C0E111C- <1>     db  00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h
    92 000106BD 0E0E1C110E1C15      <1>
    93 000106C4 0E1C180E1C1C0E181C- <1>     db  00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh
    93 000106CD 0E151C0E111C0E      <1>
    94 000106D4 0E1C0E0E1C110E1C15- <1>     db  00eh, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh
    94 000106DD 0E1C180E1C1C0E      <1>
    95 000106E4 181C0E151C0E111C14- <1>     db  018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h
    95 000106ED 141C16141C1814      <1>
    96 000106F4 1C1A141C1C141C1C14- <1>     db  01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h
    96 000106FD 1A1C14181C1416      <1>
    97 00010704 1C14141C16141C1814- <1>     db  01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah
    97 0001070D 1C1A141C1C141A      <1>
    98 00010714 1C14181C14161C1414- <1>     db  01ch, 014h, 018h, 01ch, 014h, 016h, 01ch, 014h, 014h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch
    98 0001071D 1C14141C16141C      <1>
    99 00010724 18141C1A141C1C141A- <1>     db  018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h, 01ch
    99 0001072D 1C14181C14161C      <1>
   100 00010734 000010040010080010- <1>     db  000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h, 010h, 010h
   100 0001073D 0C001010001010      <1>
   101 00010744 000C10000810000410- <1>     db  000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h
   101 0001074D 00001004001008      <1>
   102 00010754 00100C001010000C10- <1>     db  000h, 010h, 00ch, 000h, 010h, 010h, 000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h
   102 0001075D 00081000041000      <1>
   103 00010764 001000001004001008- <1>     db  000h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h
   103 0001076D 00100C00101000      <1>
   104 00010774 0C1000081000041008- <1>     db  00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h
   104 0001077D 08100A08100C08      <1>
   105 00010784 100E08101008101008- <1>     db  010h, 00eh, 008h, 010h, 010h, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah
   105 0001078D 0E10080C10080A      <1>
   106 00010794 100808100A08100C08- <1>     db  010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh
   106 0001079D 100E081010080E      <1>
   107 000107A4 10080C10080A100808- <1>     db  010h, 008h, 00ch, 010h, 008h, 00ah, 010h, 008h, 008h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h
   107 000107AD 100808100A0810      <1>
   108 000107B4 0C08100E081010080E- <1>     db  00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah, 010h
   108 000107BD 10080C10080A10      <1>
   109 000107C4 0B0B100C0B100D0B10- <1>     db  00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 010h, 010h
   109 000107CD 0F0B10100B1010      <1>
   110 000107D4 0B0F100B0D100B0C10- <1>     db  00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh
   110 000107DD 0B0B100C0B100D      <1>
   111 000107E4 0B100F0B10100B0F10- <1>     db  00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh
   111 000107ED 0B0D100B0C100B      <1>
   112 000107F4 0B100B0B100C0B100D- <1>     db  00bh, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh
   112 000107FD 0B100F0B10100B      <1>
   113 00010804 0F100B0D100B0C1000- <1>     db  00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   113 0001080D 00000000000000      <1>
   114 00010814 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   114 0001081D 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 00010824 00000000000000007E- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 07eh, 081h, 0a5h, 081h, 0bdh, 099h, 081h, 07eh
   122 0001082D 81A581BD99817E      <1>
   123 00010834 7EFFDBFFC3E7FF7E6C- <1>     db  07eh, 0ffh, 0dbh, 0ffh, 0c3h, 0e7h, 0ffh, 07eh, 06ch, 0feh, 0feh, 0feh, 07ch, 038h, 010h, 000h
   123 0001083D FEFEFE7C381000      <1>
   124 00010844 10387CFE7C38100038- <1>     db  010h, 038h, 07ch, 0feh, 07ch, 038h, 010h, 000h, 038h, 07ch, 038h, 0feh, 0feh, 07ch, 038h, 07ch
   124 0001084D 7C38FEFE7C387C      <1>
   125 00010854 1010387CFE7C387C00- <1>     db  010h, 010h, 038h, 07ch, 0feh, 07ch, 038h, 07ch, 000h, 000h, 018h, 03ch, 03ch, 018h, 000h, 000h
   125 0001085D 00183C3C180000      <1>
   126 00010864 FFFFE7C3C3E7FFFF00- <1>     db  0ffh, 0ffh, 0e7h, 0c3h, 0c3h, 0e7h, 0ffh, 0ffh, 000h, 03ch, 066h, 042h, 042h, 066h, 03ch, 000h
   126 0001086D 3C664242663C00      <1>
   127 00010874 FFC399BDBD99C3FF0F- <1>     db  0ffh, 0c3h, 099h, 0bdh, 0bdh, 099h, 0c3h, 0ffh, 00fh, 007h, 00fh, 07dh, 0cch, 0cch, 0cch, 078h
   127 0001087D 070F7DCCCCCC78      <1>
   128 00010884 3C6666663C187E183F- <1>     db  03ch, 066h, 066h, 066h, 03ch, 018h, 07eh, 018h, 03fh, 033h, 03fh, 030h, 030h, 070h, 0f0h, 0e0h
   128 0001088D 333F303070F0E0      <1>
   129 00010894 7F637F636367E6C099- <1>     db  07fh, 063h, 07fh, 063h, 063h, 067h, 0e6h, 0c0h, 099h, 05ah, 03ch, 0e7h, 0e7h, 03ch, 05ah, 099h
   129 0001089D 5A3CE7E73C5A99      <1>
   130 000108A4 80E0F8FEF8E0800002- <1>     db  080h, 0e0h, 0f8h, 0feh, 0f8h, 0e0h, 080h, 000h, 002h, 00eh, 03eh, 0feh, 03eh, 00eh, 002h, 000h
   130 000108AD 0E3EFE3E0E0200      <1>
   131 000108B4 183C7E18187E3C1866- <1>     db  018h, 03ch, 07eh, 018h, 018h, 07eh, 03ch, 018h, 066h, 066h, 066h, 066h, 066h, 000h, 066h, 000h
   131 000108BD 66666666006600      <1>
   132 000108C4 7FDBDB7B1B1B1B003E- <1>     db  07fh, 0dbh, 0dbh, 07bh, 01bh, 01bh, 01bh, 000h, 03eh, 063h, 038h, 06ch, 06ch, 038h, 0cch, 078h
   132 000108CD 63386C6C38CC78      <1>
   133 000108D4 000000007E7E7E0018- <1>     db  000h, 000h, 000h, 000h, 07eh, 07eh, 07eh, 000h, 018h, 03ch, 07eh, 018h, 07eh, 03ch, 018h, 0ffh
   133 000108DD 3C7E187E3C18FF      <1>
   134 000108E4 183C7E181818180018- <1>     db  018h, 03ch, 07eh, 018h, 018h, 018h, 018h, 000h, 018h, 018h, 018h, 018h, 07eh, 03ch, 018h, 000h
   134 000108ED 1818187E3C1800      <1>
   135 000108F4 00180CFE0C18000000- <1>     db  000h, 018h, 00ch, 0feh, 00ch, 018h, 000h, 000h, 000h, 030h, 060h, 0feh, 060h, 030h, 000h, 000h
   135 000108FD 3060FE60300000      <1>
   136 00010904 0000C0C0C0FE000000- <1>     db  000h, 000h, 0c0h, 0c0h, 0c0h, 0feh, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h
   136 0001090D 2466FF66240000      <1>
   137 00010914 00183C7EFFFF000000- <1>     db  000h, 018h, 03ch, 07eh, 0ffh, 0ffh, 000h, 000h, 000h, 0ffh, 0ffh, 07eh, 03ch, 018h, 000h, 000h
   137 0001091D FFFF7E3C180000      <1>
   138 00010924 000000000000000030- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 030h, 078h, 078h, 030h, 030h, 000h, 030h, 000h
   138 0001092D 78783030003000      <1>
   139 00010934 6C6C6C00000000006C- <1>     db  06ch, 06ch, 06ch, 000h, 000h, 000h, 000h, 000h, 06ch, 06ch, 0feh, 06ch, 0feh, 06ch, 06ch, 000h
   139 0001093D 6CFE6CFE6C6C00      <1>
   140 00010944 307CC0780CF8300000- <1>     db  030h, 07ch, 0c0h, 078h, 00ch, 0f8h, 030h, 000h, 000h, 0c6h, 0cch, 018h, 030h, 066h, 0c6h, 000h
   140 0001094D C6CC183066C600      <1>
   141 00010954 386C3876DCCC760060- <1>     db  038h, 06ch, 038h, 076h, 0dch, 0cch, 076h, 000h, 060h, 060h, 0c0h, 000h, 000h, 000h, 000h, 000h
   141 0001095D 60C00000000000      <1>
   142 00010964 183060606030180060- <1>     db  018h, 030h, 060h, 060h, 060h, 030h, 018h, 000h, 060h, 030h, 018h, 018h, 018h, 030h, 060h, 000h
   142 0001096D 30181818306000      <1>
   143 00010974 00663CFF3C66000000- <1>     db  000h, 066h, 03ch, 0ffh, 03ch, 066h, 000h, 000h, 000h, 030h, 030h, 0fch, 030h, 030h, 000h, 000h
   143 0001097D 3030FC30300000      <1>
   144 00010984 000000000030306000- <1>     db  000h, 000h, 000h, 000h, 000h, 030h, 030h, 060h, 000h, 000h, 000h, 0fch, 000h, 000h, 000h, 000h
   144 0001098D 0000FC00000000      <1>
   145 00010994 000000000030300006- <1>     db  000h, 000h, 000h, 000h, 000h, 030h, 030h, 000h, 006h, 00ch, 018h, 030h, 060h, 0c0h, 080h, 000h
   145 0001099D 0C183060C08000      <1>
   146 000109A4 7CC6CEDEF6E67C0030- <1>     db  07ch, 0c6h, 0ceh, 0deh, 0f6h, 0e6h, 07ch, 000h, 030h, 070h, 030h, 030h, 030h, 030h, 0fch, 000h
   146 000109AD 7030303030FC00      <1>
   147 000109B4 78CC0C3860CCFC0078- <1>     db  078h, 0cch, 00ch, 038h, 060h, 0cch, 0fch, 000h, 078h, 0cch, 00ch, 038h, 00ch, 0cch, 078h, 000h
   147 000109BD CC0C380CCC7800      <1>
   148 000109C4 1C3C6CCCFE0C1E00FC- <1>     db  01ch, 03ch, 06ch, 0cch, 0feh, 00ch, 01eh, 000h, 0fch, 0c0h, 0f8h, 00ch, 00ch, 0cch, 078h, 000h
   148 000109CD C0F80C0CCC7800      <1>
   149 000109D4 3860C0F8CCCC7800FC- <1>     db  038h, 060h, 0c0h, 0f8h, 0cch, 0cch, 078h, 000h, 0fch, 0cch, 00ch, 018h, 030h, 030h, 030h, 000h
   149 000109DD CC0C1830303000      <1>
   150 000109E4 78CCCC78CCCC780078- <1>     db  078h, 0cch, 0cch, 078h, 0cch, 0cch, 078h, 000h, 078h, 0cch, 0cch, 07ch, 00ch, 018h, 070h, 000h
   150 000109ED CCCC7C0C187000      <1>
   151 000109F4 003030000030300000- <1>     db  000h, 030h, 030h, 000h, 000h, 030h, 030h, 000h, 000h, 030h, 030h, 000h, 000h, 030h, 030h, 060h
   151 000109FD 30300000303060      <1>
   152 00010A04 183060C06030180000- <1>     db  018h, 030h, 060h, 0c0h, 060h, 030h, 018h, 000h, 000h, 000h, 0fch, 000h, 000h, 0fch, 000h, 000h
   152 00010A0D 00FC0000FC0000      <1>
   153 00010A14 6030180C1830600078- <1>     db  060h, 030h, 018h, 00ch, 018h, 030h, 060h, 000h, 078h, 0cch, 00ch, 018h, 030h, 000h, 030h, 000h
   153 00010A1D CC0C1830003000      <1>
   154 00010A24 7CC6DEDEDEC0780030- <1>     db  07ch, 0c6h, 0deh, 0deh, 0deh, 0c0h, 078h, 000h, 030h, 078h, 0cch, 0cch, 0fch, 0cch, 0cch, 000h
   154 00010A2D 78CCCCFCCCCC00      <1>
   155 00010A34 FC66667C6666FC003C- <1>     db  0fch, 066h, 066h, 07ch, 066h, 066h, 0fch, 000h, 03ch, 066h, 0c0h, 0c0h, 0c0h, 066h, 03ch, 000h
   155 00010A3D 66C0C0C0663C00      <1>
   156 00010A44 F86C6666666CF800FE- <1>     db  0f8h, 06ch, 066h, 066h, 066h, 06ch, 0f8h, 000h, 0feh, 062h, 068h, 078h, 068h, 062h, 0feh, 000h
   156 00010A4D 6268786862FE00      <1>
   157 00010A54 FE6268786860F0003C- <1>     db  0feh, 062h, 068h, 078h, 068h, 060h, 0f0h, 000h, 03ch, 066h, 0c0h, 0c0h, 0ceh, 066h, 03eh, 000h
   157 00010A5D 66C0C0CE663E00      <1>
   158 00010A64 CCCCCCFCCCCCCC0078- <1>     db  0cch, 0cch, 0cch, 0fch, 0cch, 0cch, 0cch, 000h, 078h, 030h, 030h, 030h, 030h, 030h, 078h, 000h
   158 00010A6D 30303030307800      <1>
   159 00010A74 1E0C0C0CCCCC7800E6- <1>     db  01eh, 00ch, 00ch, 00ch, 0cch, 0cch, 078h, 000h, 0e6h, 066h, 06ch, 078h, 06ch, 066h, 0e6h, 000h
   159 00010A7D 666C786C66E600      <1>
   160 00010A84 F06060606266FE00C6- <1>     db  0f0h, 060h, 060h, 060h, 062h, 066h, 0feh, 000h, 0c6h, 0eeh, 0feh, 0feh, 0d6h, 0c6h, 0c6h, 000h
   160 00010A8D EEFEFED6C6C600      <1>
   161 00010A94 C6E6F6DECEC6C60038- <1>     db  0c6h, 0e6h, 0f6h, 0deh, 0ceh, 0c6h, 0c6h, 000h, 038h, 06ch, 0c6h, 0c6h, 0c6h, 06ch, 038h, 000h
   161 00010A9D 6CC6C6C66C3800      <1>
   162 00010AA4 FC66667C6060F00078- <1>     db  0fch, 066h, 066h, 07ch, 060h, 060h, 0f0h, 000h, 078h, 0cch, 0cch, 0cch, 0dch, 078h, 01ch, 000h
   162 00010AAD CCCCCCDC781C00      <1>
   163 00010AB4 FC66667C6C66E60078- <1>     db  0fch, 066h, 066h, 07ch, 06ch, 066h, 0e6h, 000h, 078h, 0cch, 0e0h, 070h, 01ch, 0cch, 078h, 000h
   163 00010ABD CCE0701CCC7800      <1>
   164 00010AC4 FCB4303030307800CC- <1>     db  0fch, 0b4h, 030h, 030h, 030h, 030h, 078h, 000h, 0cch, 0cch, 0cch, 0cch, 0cch, 0cch, 0fch, 000h
   164 00010ACD CCCCCCCCCCFC00      <1>
   165 00010AD4 CCCCCCCCCC783000C6- <1>     db  0cch, 0cch, 0cch, 0cch, 0cch, 078h, 030h, 000h, 0c6h, 0c6h, 0c6h, 0d6h, 0feh, 0eeh, 0c6h, 000h
   165 00010ADD C6C6D6FEEEC600      <1>
   166 00010AE4 C6C66C38386CC600CC- <1>     db  0c6h, 0c6h, 06ch, 038h, 038h, 06ch, 0c6h, 000h, 0cch, 0cch, 0cch, 078h, 030h, 030h, 078h, 000h
   166 00010AED CCCC7830307800      <1>
   167 00010AF4 FEC68C183266FE0078- <1>     db  0feh, 0c6h, 08ch, 018h, 032h, 066h, 0feh, 000h, 078h, 060h, 060h, 060h, 060h, 060h, 078h, 000h
   167 00010AFD 60606060607800      <1>
   168 00010B04 C06030180C06020078- <1>     db  0c0h, 060h, 030h, 018h, 00ch, 006h, 002h, 000h, 078h, 018h, 018h, 018h, 018h, 018h, 078h, 000h
   168 00010B0D 18181818187800      <1>
   169 00010B14 10386CC60000000000- <1>     db  010h, 038h, 06ch, 0c6h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 0ffh
   169 00010B1D 000000000000FF      <1>
   170 00010B24 303018000000000000- <1>     db  030h, 030h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 078h, 00ch, 07ch, 0cch, 076h, 000h
   170 00010B2D 00780C7CCC7600      <1>
   171 00010B34 E060607C6666DC0000- <1>     db  0e0h, 060h, 060h, 07ch, 066h, 066h, 0dch, 000h, 000h, 000h, 078h, 0cch, 0c0h, 0cch, 078h, 000h
   171 00010B3D 0078CCC0CC7800      <1>
   172 00010B44 1C0C0C7CCCCC760000- <1>     db  01ch, 00ch, 00ch, 07ch, 0cch, 0cch, 076h, 000h, 000h, 000h, 078h, 0cch, 0fch, 0c0h, 078h, 000h
   172 00010B4D 0078CCFCC07800      <1>
   173 00010B54 386C60F06060F00000- <1>     db  038h, 06ch, 060h, 0f0h, 060h, 060h, 0f0h, 000h, 000h, 000h, 076h, 0cch, 0cch, 07ch, 00ch, 0f8h
   173 00010B5D 0076CCCC7C0CF8      <1>
   174 00010B64 E0606C766666E60030- <1>     db  0e0h, 060h, 06ch, 076h, 066h, 066h, 0e6h, 000h, 030h, 000h, 070h, 030h, 030h, 030h, 078h, 000h
   174 00010B6D 00703030307800      <1>
   175 00010B74 0C000C0C0CCCCC78E0- <1>     db  00ch, 000h, 00ch, 00ch, 00ch, 0cch, 0cch, 078h, 0e0h, 060h, 066h, 06ch, 078h, 06ch, 0e6h, 000h
   175 00010B7D 60666C786CE600      <1>
   176 00010B84 703030303030780000- <1>     db  070h, 030h, 030h, 030h, 030h, 030h, 078h, 000h, 000h, 000h, 0cch, 0feh, 0feh, 0d6h, 0c6h, 000h
   176 00010B8D 00CCFEFED6C600      <1>
   177 00010B94 0000F8CCCCCCCC0000- <1>     db  000h, 000h, 0f8h, 0cch, 0cch, 0cch, 0cch, 000h, 000h, 000h, 078h, 0cch, 0cch, 0cch, 078h, 000h
   177 00010B9D 0078CCCCCC7800      <1>
   178 00010BA4 0000DC66667C60F000- <1>     db  000h, 000h, 0dch, 066h, 066h, 07ch, 060h, 0f0h, 000h, 000h, 076h, 0cch, 0cch, 07ch, 00ch, 01eh
   178 00010BAD 0076CCCC7C0C1E      <1>
   179 00010BB4 0000DC766660F00000- <1>     db  000h, 000h, 0dch, 076h, 066h, 060h, 0f0h, 000h, 000h, 000h, 07ch, 0c0h, 078h, 00ch, 0f8h, 000h
   179 00010BBD 007CC0780CF800      <1>
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   180 00010BCD 00CCCCCCCC7600      <1>
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   181 00010BDD 00C6D6FEFE6C00      <1>
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   182 00010BED 00CCCCCC7C0CF8      <1>
   183 00010BF4 0000FC983064FC001C- <1>     db  000h, 000h, 0fch, 098h, 030h, 064h, 0fch, 000h, 01ch, 030h, 030h, 0e0h, 030h, 030h, 01ch, 000h
   183 00010BFD 3030E030301C00      <1>
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   184 00010C0D 30301C3030E000      <1>
   185 00010C14 76DC00000000000000- <1>     db  076h, 0dch, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 010h, 038h, 06ch, 0c6h, 0c6h, 0feh, 000h
   185 00010C1D 10386CC6C6FE00      <1>
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   186 00010C2D CC00CCCCCC7E00      <1>
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   187 00010C3D C33C063E663F00      <1>
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   188 00010C4D 00780C7CCC7E00      <1>
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   189 00010C5D 0078C0C0780C38      <1>
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   190 00010C6D 0078CCFCC07800      <1>
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   191 00010C7D 00703030307800      <1>
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   192 00010C8D 00703030307800      <1>
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   193 00010C9D 300078CCFCCC00      <1>
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   194 00010CAD 007F0C7FCC7F00      <1>
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   198 00010CED 183C66663C1800      <1>
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   199 00010CFD 187EC0C07E1818      <1>
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   200 00010D0D CC78FC30FC3030      <1>
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   201 00010D1D 1B183C1818D870      <1>
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   202 00010D2D 00703030307800      <1>
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   203 00010D3D 1C00CCCCCC7E00      <1>
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   204 00010D4D 00CCECFCDCCC00      <1>
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   205 00010D5D 6C6C38007C0000      <1>
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   206 00010D6D 0000FCC0C00000      <1>
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   207 00010D7D C6CCDE3366CC0F      <1>
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   208 00010D8D 18001818181800      <1>
   209 00010D94 003366CC6633000000- <1>     db  000h, 033h, 066h, 0cch, 066h, 033h, 000h, 000h, 000h, 0cch, 066h, 033h, 066h, 0cch, 000h, 000h
   209 00010D9D CC663366CC0000      <1>
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   210 00010DAD AA55AA55AA55AA      <1>
   211 00010DB4 DB77DBEEDB77DBEE18- <1>     db  0dbh, 077h, 0dbh, 0eeh, 0dbh, 077h, 0dbh, 0eeh, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h
   211 00010DBD 18181818181818      <1>
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   212 00010DCD 18F818F8181818      <1>
   213 00010DD4 36363636F636363600- <1>     db  036h, 036h, 036h, 036h, 0f6h, 036h, 036h, 036h, 000h, 000h, 000h, 000h, 0feh, 036h, 036h, 036h
   213 00010DDD 000000FE363636      <1>
   214 00010DE4 0000F818F818181836- <1>     db  000h, 000h, 0f8h, 018h, 0f8h, 018h, 018h, 018h, 036h, 036h, 0f6h, 006h, 0f6h, 036h, 036h, 036h
   214 00010DED 36F606F6363636      <1>
   215 00010DF4 363636363636363600- <1>     db  036h, 036h, 036h, 036h, 036h, 036h, 036h, 036h, 000h, 000h, 0feh, 006h, 0f6h, 036h, 036h, 036h
   215 00010DFD 00FE06F6363636      <1>
   216 00010E04 3636F606FE00000036- <1>     db  036h, 036h, 0f6h, 006h, 0feh, 000h, 000h, 000h, 036h, 036h, 036h, 036h, 0feh, 000h, 000h, 000h
   216 00010E0D 363636FE000000      <1>
   217 00010E14 1818F818F800000000- <1>     db  018h, 018h, 0f8h, 018h, 0f8h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 0f8h, 018h, 018h, 018h
   217 00010E1D 000000F8181818      <1>
   218 00010E24 181818181F00000018- <1>     db  018h, 018h, 018h, 018h, 01fh, 000h, 000h, 000h, 018h, 018h, 018h, 018h, 0ffh, 000h, 000h, 000h
   218 00010E2D 181818FF000000      <1>
   219 00010E34 00000000FF18181818- <1>     db  000h, 000h, 000h, 000h, 0ffh, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 01fh, 018h, 018h, 018h
   219 00010E3D 1818181F181818      <1>
   220 00010E44 00000000FF00000018- <1>     db  000h, 000h, 000h, 000h, 0ffh, 000h, 000h, 000h, 018h, 018h, 018h, 018h, 0ffh, 018h, 018h, 018h
   220 00010E4D 181818FF181818      <1>
   221 00010E54 18181F181F18181836- <1>     db  018h, 018h, 01fh, 018h, 01fh, 018h, 018h, 018h, 036h, 036h, 036h, 036h, 037h, 036h, 036h, 036h
   221 00010E5D 36363637363636      <1>
   222 00010E64 363637303F00000000- <1>     db  036h, 036h, 037h, 030h, 03fh, 000h, 000h, 000h, 000h, 000h, 03fh, 030h, 037h, 036h, 036h, 036h
   222 00010E6D 003F3037363636      <1>
   223 00010E74 3636F700FF00000000- <1>     db  036h, 036h, 0f7h, 000h, 0ffh, 000h, 000h, 000h, 000h, 000h, 0ffh, 000h, 0f7h, 036h, 036h, 036h
   223 00010E7D 00FF00F7363636      <1>
   224 00010E84 363637303736363600- <1>     db  036h, 036h, 037h, 030h, 037h, 036h, 036h, 036h, 000h, 000h, 0ffh, 000h, 0ffh, 000h, 000h, 000h
   224 00010E8D 00FF00FF000000      <1>
   225 00010E94 3636F700F736363618- <1>     db  036h, 036h, 0f7h, 000h, 0f7h, 036h, 036h, 036h, 018h, 018h, 0ffh, 000h, 0ffh, 000h, 000h, 000h
   225 00010E9D 18FF00FF000000      <1>
   226 00010EA4 36363636FF00000000- <1>     db  036h, 036h, 036h, 036h, 0ffh, 000h, 000h, 000h, 000h, 000h, 0ffh, 000h, 0ffh, 018h, 018h, 018h
   226 00010EAD 00FF00FF181818      <1>
   227 00010EB4 00000000FF36363636- <1>     db  000h, 000h, 000h, 000h, 0ffh, 036h, 036h, 036h, 036h, 036h, 036h, 036h, 03fh, 000h, 000h, 000h
   227 00010EBD 3636363F000000      <1>
   228 00010EC4 18181F181F00000000- <1>     db  018h, 018h, 01fh, 018h, 01fh, 000h, 000h, 000h, 000h, 000h, 01fh, 018h, 01fh, 018h, 018h, 018h
   228 00010ECD 001F181F181818      <1>
   229 00010ED4 000000003F36363636- <1>     db  000h, 000h, 000h, 000h, 03fh, 036h, 036h, 036h, 036h, 036h, 036h, 036h, 0ffh, 036h, 036h, 036h
   229 00010EDD 363636FF363636      <1>
   230 00010EE4 1818FF18FF18181818- <1>     db  018h, 018h, 0ffh, 018h, 0ffh, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 0f8h, 000h, 000h, 000h
   230 00010EED 181818F8000000      <1>
   231 00010EF4 000000001F181818FF- <1>     db  000h, 000h, 000h, 000h, 01fh, 018h, 018h, 018h, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh
   231 00010EFD FFFFFFFFFFFFFF      <1>
   232 00010F04 00000000FFFFFFFFF0- <1>     db  000h, 000h, 000h, 000h, 0ffh, 0ffh, 0ffh, 0ffh, 0f0h, 0f0h, 0f0h, 0f0h, 0f0h, 0f0h, 0f0h, 0f0h
   232 00010F0D F0F0F0F0F0F0F0      <1>
   233 00010F14 0F0F0F0F0F0F0F0FFF- <1>     db  00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 0ffh, 0ffh, 0ffh, 0ffh, 000h, 000h, 000h, 000h
   233 00010F1D FFFFFF00000000      <1>
   234 00010F24 000076DCC8DC760000- <1>     db  000h, 000h, 076h, 0dch, 0c8h, 0dch, 076h, 000h, 000h, 078h, 0cch, 0f8h, 0cch, 0f8h, 0c0h, 0c0h
   234 00010F2D 78CCF8CCF8C0C0      <1>
   235 00010F34 00FCCCC0C0C0C00000- <1>     db  000h, 0fch, 0cch, 0c0h, 0c0h, 0c0h, 0c0h, 000h, 000h, 0feh, 06ch, 06ch, 06ch, 06ch, 06ch, 000h
   235 00010F3D FE6C6C6C6C6C00      <1>
   236 00010F44 FCCC603060CCFC0000- <1>     db  0fch, 0cch, 060h, 030h, 060h, 0cch, 0fch, 000h, 000h, 000h, 07eh, 0d8h, 0d8h, 0d8h, 070h, 000h
   236 00010F4D 007ED8D8D87000      <1>
   237 00010F54 00666666667C60C000- <1>     db  000h, 066h, 066h, 066h, 066h, 07ch, 060h, 0c0h, 000h, 076h, 0dch, 018h, 018h, 018h, 018h, 000h
   237 00010F5D 76DC1818181800      <1>
   238 00010F64 FC3078CCCC7830FC38- <1>     db  0fch, 030h, 078h, 0cch, 0cch, 078h, 030h, 0fch, 038h, 06ch, 0c6h, 0feh, 0c6h, 06ch, 038h, 000h
   238 00010F6D 6CC6FEC66C3800      <1>
   239 00010F74 386CC6C66C6CEE001C- <1>     db  038h, 06ch, 0c6h, 0c6h, 06ch, 06ch, 0eeh, 000h, 01ch, 030h, 018h, 07ch, 0cch, 0cch, 078h, 000h
   239 00010F7D 30187CCCCC7800      <1>
   240 00010F84 00007EDBDB7E000006- <1>     db  000h, 000h, 07eh, 0dbh, 0dbh, 07eh, 000h, 000h, 006h, 00ch, 07eh, 0dbh, 0dbh, 07eh, 060h, 0c0h
   240 00010F8D 0C7EDBDB7E60C0      <1>
   241 00010F94 3860C0F8C060380078- <1>     db  038h, 060h, 0c0h, 0f8h, 0c0h, 060h, 038h, 000h, 078h, 0cch, 0cch, 0cch, 0cch, 0cch, 0cch, 000h
   241 00010F9D CCCCCCCCCCCC00      <1>
   242 00010FA4 00FC00FC00FC000030- <1>     db  000h, 0fch, 000h, 0fch, 000h, 0fch, 000h, 000h, 030h, 030h, 0fch, 030h, 030h, 000h, 0fch, 000h
   242 00010FAD 30FC303000FC00      <1>
   243 00010FB4 603018306000FC0018- <1>     db  060h, 030h, 018h, 030h, 060h, 000h, 0fch, 000h, 018h, 030h, 060h, 030h, 018h, 000h, 0fch, 000h
   243 00010FBD 3060301800FC00      <1>
   244 00010FC4 0E1B1B181818181818- <1>     db  00eh, 01bh, 01bh, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 0d8h, 0d8h, 070h
   244 00010FCD 18181818D8D870      <1>
   245 00010FD4 303000FC0030300000- <1>     db  030h, 030h, 000h, 0fch, 000h, 030h, 030h, 000h, 000h, 076h, 0dch, 000h, 076h, 0dch, 000h, 000h
   245 00010FDD 76DC0076DC0000      <1>
   246 00010FE4 386C6C380000000000- <1>     db  038h, 06ch, 06ch, 038h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 018h, 000h, 000h, 000h
   246 00010FED 00001818000000      <1>
   247 00010FF4 00000000180000000F- <1>     db  000h, 000h, 000h, 000h, 018h, 000h, 000h, 000h, 00fh, 00ch, 00ch, 00ch, 0ech, 06ch, 03ch, 01ch
   247 00010FFD 0C0C0CEC6C3C1C      <1>
   248 00011004 786C6C6C6C00000070- <1>     db  078h, 06ch, 06ch, 06ch, 06ch, 000h, 000h, 000h, 070h, 018h, 030h, 060h, 078h, 000h, 000h, 000h
   248 0001100D 18306078000000      <1>
   249 00011014 00003C3C3C3C000000- <1>     db  000h, 000h, 03ch, 03ch, 03ch, 03ch, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   249 0001101D 00000000000000      <1>
   250                              <1> vgafont14:
   251 00011024 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   251 0001102D 00000000000000      <1>
   252 00011034 7E81A58181BD99817E- <1>     db  07eh, 081h, 0a5h, 081h, 081h, 0bdh, 099h, 081h, 07eh, 000h, 000h, 000h, 000h, 000h, 07eh, 0ffh
   252 0001103D 00000000007EFF      <1>
   253 00011044 DBFFFFC3E7FF7E0000- <1>     db  0dbh, 0ffh, 0ffh, 0c3h, 0e7h, 0ffh, 07eh, 000h, 000h, 000h, 000h, 000h, 000h, 06ch, 0feh, 0feh
   253 0001104D 000000006CFEFE      <1>
   254 00011054 FEFE7C381000000000- <1>     db  0feh, 0feh, 07ch, 038h, 010h, 000h, 000h, 000h, 000h, 000h, 000h, 010h, 038h, 07ch, 0feh, 07ch
   254 0001105D 000010387CFE7C      <1>
   255 00011064 381000000000000018- <1>     db  038h, 010h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 03ch, 03ch, 0e7h, 0e7h, 0e7h, 018h, 018h
   255 0001106D 3C3CE7E7E71818      <1>
   256 00011074 3C0000000000183C7E- <1>     db  03ch, 000h, 000h, 000h, 000h, 000h, 018h, 03ch, 07eh, 0ffh, 0ffh, 07eh, 018h, 018h, 03ch, 000h
   256 0001107D FFFF7E18183C00      <1>
   257 00011084 00000000000000183C- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 03ch, 03ch, 018h, 000h, 000h, 000h, 000h, 000h
   257 0001108D 3C180000000000      <1>
   258 00011094 FFFFFFFFFFE7C3C3E7- <1>     db  0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0e7h, 0c3h, 0c3h, 0e7h, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 000h, 000h
   258 0001109D FFFFFFFFFF0000      <1>
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   259 000110AD 000000FFFFFFFF      <1>
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   308 000113BD 0000000000FC66      <1>
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   319 0001146D FEDECEC6C6C600      <1>
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   329 0001150D 0000000000FEC6      <1>
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   330 0001151D 0000003C303030      <1>
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   336 0001157D 0000000000E060      <1>
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   337 0001158D 0000000000007C      <1>
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   339 000115AD 00007CC6FEC0C6      <1>
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   340 000115BD 60F0606060F000      <1>
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   474 00011E1D 00000000000000      <1>
   475                              <1> vgafont16:
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   496 00011F6D 1B1B1B00000000      <1>
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   501 00011FBD 7E3C1800000000      <1>
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   504 00011FED FE000000000000      <1>
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   506 0001200D FEFE0000000000      <1>
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   576 0001246D CCCC7600000000      <1>
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   577 0001247D C0C67C00000000      <1>
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   578 0001248D 6060F000000000      <1>
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   587 0001251D C6C67C00000000      <1>
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   588 0001252D 66667C6060F000      <1>
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   589 0001253D CCCC7C0C0C1E00      <1>
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   676 00012AAD 00000000000000      <1>
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   689 00012B74 00000000001F181F18- <1>     db  000h, 000h, 000h, 000h, 000h, 01fh, 018h, 01fh, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h
   689 00012B7D 18181818181818      <1>
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   690 00012B8D 36363636363636      <1>
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   691 00012B9D 36363636363636      <1>
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   692 00012BAD 18181818181818      <1>
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   693 00012BBD 00000000000000      <1>
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   694 00012BCD 18181818181818      <1>
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   695 00012BDD FFFFFFFFFFFFFF      <1>
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   696 00012BED FFFFFFFFFFFFFF      <1>
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   697 00012BFD F0F0F0F0F0F0F0      <1>
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   699 00012C1D 00000000000000      <1>
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   701 00012C3D C6C6CC00000000      <1>
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   702 00012C4D C0C0C000000000      <1>
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   704 00012C6D 60C6FE00000000      <1>
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   705 00012C7D D8D87000000000      <1>
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   706 00012C8D 7C6060C0000000      <1>
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   710 00012CCD 6C6CEE00000000      <1>
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   711 00012CDD 66663C00000000      <1>
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   712 00012CED 7E000000000000      <1>
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   713 00012CFD 7E60C000000000      <1>
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   714 00012D0D 60301C00000000      <1>
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   715 00012D1D C6C6C600000000      <1>
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   716 00012D2D 00FE0000000000      <1>
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   717 00012D3D 0000FF00000000      <1>
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   718 00012D4D 30007E00000000      <1>
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   719 00012D5D 0C007E00000000      <1>
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   720 00012D6D 18181818181818      <1>
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   721 00012D7D D8D87000000000      <1>
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   722 00012D8D 18180000000000      <1>
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   723 00012D9D DC000000000000      <1>
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   724 00012DAD 00000000000000      <1>
   725 00012DB4 000000000000001818- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   725 00012DBD 00000000000000      <1>
   726 00012DC4 000000000000000018- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   726 00012DCD 00000000000000      <1>
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   727 00012DDD 6C3C1C00000000      <1>
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   728 00012DED 00000000000000      <1>
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   729 00012DFD 00000000000000      <1>
   730 00012E04 000000007C7C7C7C7C- <1>     db  000h, 000h, 000h, 000h, 07ch, 07ch, 07ch, 07ch, 07ch, 07ch, 07ch, 000h, 000h, 000h, 000h, 000h
   730 00012E0D 7C7C0000000000      <1>
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   731 00012E1D 00000000000000      <1>
   732                              <1> vgafont14alt:
   733 00012E24 1D000000002466FF66- <1>     db  01dh, 000h, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h, 000h, 000h, 000h, 022h
   733 00012E2D 24000000000022      <1>
   734 00012E34 006363632200000000- <1>     db  000h, 063h, 063h, 063h, 022h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02bh, 000h
   734 00012E3D 00000000002B00      <1>
   735 00012E44 0000181818FF181818- <1>     db  000h, 000h, 018h, 018h, 018h, 0ffh, 018h, 018h, 018h, 000h, 000h, 000h, 000h, 02dh, 000h, 000h
   735 00012E4D 000000002D0000      <1>
   736 00012E54 00000000FF00000000- <1>     db  000h, 000h, 000h, 000h, 0ffh, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 04dh, 000h, 000h, 0c3h
   736 00012E5D 0000004D0000C3      <1>
   737 00012E64 E7FFDBC3C3C3C3C300- <1>     db  0e7h, 0ffh, 0dbh, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 000h, 000h, 000h, 054h, 000h, 000h, 0ffh, 0dbh
   737 00012E6D 0000540000FFDB      <1>
   738 00012E74 9918181818183C0000- <1>     db  099h, 018h, 018h, 018h, 018h, 018h, 03ch, 000h, 000h, 000h, 056h, 000h, 000h, 0c3h, 0c3h, 0c3h
   738 00012E7D 00560000C3C3C3      <1>
   739 00012E84 C3C3C3663C18000000- <1>     db  0c3h, 0c3h, 0c3h, 066h, 03ch, 018h, 000h, 000h, 000h, 057h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h
   739 00012E8D 570000C3C3C3C3      <1>
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   740 00012E9D 0000C3C3663C18      <1>
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   741 00012EAD 00C3C3C3663C18      <1>
   742 00012EB4 18183C0000005A0000- <1>     db  018h, 018h, 03ch, 000h, 000h, 000h, 05ah, 000h, 000h, 0ffh, 0c3h, 086h, 00ch, 018h, 030h, 061h
   742 00012EBD FFC3860C183061      <1>
   743 00012EC4 C3FF0000006D000000- <1>     db  0c3h, 0ffh, 000h, 000h, 000h, 06dh, 000h, 000h, 000h, 000h, 000h, 0e6h, 0ffh, 0dbh, 0dbh, 0dbh
   743 00012ECD 0000E6FFDBDBDB      <1>
   744 00012ED4 DB0000007600000000- <1>     db  0dbh, 000h, 000h, 000h, 076h, 000h, 000h, 000h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   744 00012EDD 00C3C3C3663C18      <1>
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   745 00012EED C3C3DBDBFF6600      <1>
   746 00012EF4 000091000000006E3B- <1>     db  000h, 000h, 091h, 000h, 000h, 000h, 000h, 06eh, 03bh, 01bh, 07eh, 0d8h, 0dch, 077h, 000h, 000h
   746 00012EFD 1B7ED8DC770000      <1>
   747 00012F04 009B0018187EC3C0C0- <1>     db  000h, 09bh, 000h, 018h, 018h, 07eh, 0c3h, 0c0h, 0c0h, 0c3h, 07eh, 018h, 018h, 000h, 000h, 000h
   747 00012F0D C37E1818000000      <1>
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   748 00012F1D FF18180000009E      <1>
   749 00012F24 00FC66667C62666F66- <1>     db  000h, 0fch, 066h, 066h, 07ch, 062h, 066h, 06fh, 066h, 066h, 0f3h, 000h, 000h, 000h, 0f1h, 000h
   749 00012F2D 66F3000000F100      <1>
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   750 00012F3D FF000000F60000      <1>
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   751 00012F4D 00000000            <1>
   752                              <1> vgafont16alt:
   753 00012F51 1D00000000002466FF- <1>     db  01dh, 000h, 000h, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h, 000h, 000h, 000h
   753 00012F5A 66240000000000      <1>
   754 00012F61 003000003C66C3C3DB- <1>     db  000h, 030h, 000h, 000h, 03ch, 066h, 0c3h, 0c3h, 0dbh, 0dbh, 0c3h, 0c3h, 066h, 03ch, 000h, 000h
   754 00012F6A DBC3C3663C0000      <1>
   755 00012F71 00004D0000C3E7FFFF- <1>     db  000h, 000h, 04dh, 000h, 000h, 0c3h, 0e7h, 0ffh, 0ffh, 0dbh, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 000h
   755 00012F7A DBC3C3C3C3C300      <1>
   756 00012F81 000000540000FFDB99- <1>     db  000h, 000h, 000h, 054h, 000h, 000h, 0ffh, 0dbh, 099h, 018h, 018h, 018h, 018h, 018h, 018h, 03ch
   756 00012F8A 1818181818183C      <1>
   757 00012F91 00000000560000C3C3- <1>     db  000h, 000h, 000h, 000h, 056h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch
   757 00012F9A C3C3C3C3C3663C      <1>
   758 00012FA1 1800000000570000C3- <1>     db  018h, 000h, 000h, 000h, 000h, 057h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh
   758 00012FAA C3C3C3C3DBDBFF      <1>
   759 00012FB1 666600000000580000- <1>     db  066h, 066h, 000h, 000h, 000h, 000h, 058h, 000h, 000h, 0c3h, 0c3h, 066h, 03ch, 018h, 018h, 03ch
   759 00012FBA C3C3663C18183C      <1>
   760 00012FC1 66C3C3000000005900- <1>     db  066h, 0c3h, 0c3h, 000h, 000h, 000h, 000h, 059h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   760 00012FCA 00C3C3C3663C18      <1>
   761 00012FD1 1818183C000000005A- <1>     db  018h, 018h, 018h, 03ch, 000h, 000h, 000h, 000h, 05ah, 000h, 000h, 0ffh, 0c3h, 086h, 00ch, 018h
   761 00012FDA 0000FFC3860C18      <1>
   762 00012FE1 3060C1C3FF00000000- <1>     db  030h, 060h, 0c1h, 0c3h, 0ffh, 000h, 000h, 000h, 000h, 06dh, 000h, 000h, 000h, 000h, 000h, 0e6h
   762 00012FEA 6D0000000000E6      <1>
   763 00012FF1 FFDBDBDBDBDB000000- <1>     db  0ffh, 0dbh, 0dbh, 0dbh, 0dbh, 0dbh, 000h, 000h, 000h, 000h, 076h, 000h, 000h, 000h, 000h, 000h
   763 00012FFA 00760000000000      <1>
   764 00013001 C3C3C3C3663C180000- <1>     db  0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h, 000h, 000h, 000h, 000h, 077h, 000h, 000h, 000h, 000h
   764 0001300A 00007700000000      <1>
   765 00013011 00C3C3C3DBDBFF6600- <1>     db  000h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh, 066h, 000h, 000h, 000h, 000h, 078h, 000h, 000h, 000h
   765 0001301A 00000078000000      <1>
   766 00013021 0000C3663C183C66C3- <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 03ch, 066h, 0c3h, 000h, 000h, 000h, 000h, 091h, 000h, 000h
   766 0001302A 00000000910000      <1>
   767 00013031 0000006E3B1B7ED8DC- <1>     db  000h, 000h, 000h, 06eh, 03bh, 01bh, 07eh, 0d8h, 0dch, 077h, 000h, 000h, 000h, 000h, 09bh, 000h
   767 0001303A 77000000009B00      <1>
   768 00013041 18187EC3C0C0C0C37E- <1>     db  018h, 018h, 07eh, 0c3h, 0c0h, 0c0h, 0c0h, 0c3h, 07eh, 018h, 018h, 000h, 000h, 000h, 000h, 09dh
   768 0001304A 1818000000009D      <1>
   769 00013051 0000C3663C18FF18FF- <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 0ffh, 018h, 0ffh, 018h, 018h, 018h, 000h, 000h, 000h, 000h
   769 0001305A 18181800000000      <1>
   770 00013061 9E00FC66667C62666F- <1>     db  09eh, 000h, 0fch, 066h, 066h, 07ch, 062h, 066h, 06fh, 066h, 066h, 066h, 0f3h, 000h, 000h, 000h
   770 0001306A 666666F3000000      <1>
   771 00013071 00AB00C0C0C2C6CC18- <1>     db  000h, 0abh, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 060h, 0ceh, 09bh, 006h, 00ch, 01fh
   771 0001307A 3060CE9B060C1F      <1>
   772 00013081 0000AC00C0C0C2C6CC- <1>     db  000h, 000h, 0ach, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 066h, 0ceh, 096h, 03eh, 006h
   772 0001308A 183066CE963E06      <1>
   773 00013091 06000000            <1>     db  006h, 000h, 000h, 000h
  2631                                  
  2632 00013095 90                      align 2
  2633                                  
  2634                                  ; EPOCH Variables
  2635                                  ; 13/04/2015 - Retro UNIX 386 v1 Beginning
  2636                                  ; 09/04/2013 epoch variables
  2637                                  ; Retro UNIX 8086 v1 Prototype: UNIXCOPY.ASM, 10/03/2013
  2638                                  ;
  2639 00013096 B207                    year: 	dw 1970
  2640 00013098 0100                    month: 	dw 1
  2641 0001309A 0100                    day: 	dw 1
  2642 0001309C 0000                    hour: 	dw 0
  2643 0001309E 0000                    minute: dw 0
  2644 000130A0 0000                    second: dw 0
  2645                                  
  2646                                  DMonth:
  2647 000130A2 0000                    	dw 0
  2648 000130A4 1F00                    	dw 31
  2649 000130A6 3B00                    	dw 59
  2650 000130A8 5A00                    	dw 90
  2651 000130AA 7800                    	dw 120
  2652 000130AC 9700                    	dw 151
  2653 000130AE B500                    	dw 181
  2654 000130B0 D400                    	dw 212
  2655 000130B2 F300                    	dw 243
  2656 000130B4 1101                    	dw 273
  2657 000130B6 3001                    	dw 304
  2658 000130B8 4E01                    	dw 334
  2659                                  
  2660                                  ; 20/02/2017
  2661                                  KERNELFSIZE  equ $  ; 04/07/2016
  2662                                  
  2663                                  bss_start:
  2664                                  
  2665                                  ABSOLUTE bss_start
  2666                                  
  2667 000130BA <res 00000006>          alignb 8 ; 25/12/2016
  2668                                  
  2669                                  	; 15/04/2016
  2670                                  	; TRDOS 386 (TRDOS v2.0)
  2671                                  	; 	80 interrupts 	
  2672                                  	; 11/03/2015
  2673                                  	; Interrupt Descriptor Table (20/08/2014)
  2674                                  idt:
  2675                                  	;resb	64*8 ; INT 0 to INT 3Fh
  2676                                  	; 15/04/2016
  2677 000130C0 <res 00000280>          	resb	80*8 ; INT 0 to INT 4Fh
  2678                                  
  2679                                  idt_end:
  2680                                  
  2681                                  ;alignb 4
  2682                                  
  2683                                  task_state_segment:
  2684                                  	; 24/03/2015
  2685 00013340 <res 00000002>          tss.link:   resw 1
  2686 00013342 <res 00000002>          	    resw 1
  2687                                  ; tss offset 4	
  2688 00013344 <res 00000004>          tss.esp0:   resd 1
  2689 00013348 <res 00000002>          tss.ss0:    resw 1
  2690 0001334A <res 00000002>          	    resw 1	
  2691 0001334C <res 00000004>          tss.esp1:   resd 1
  2692 00013350 <res 00000002>          tss.ss1:    resw 1
  2693 00013352 <res 00000002>          	    resw 1 	
  2694 00013354 <res 00000004>          tss.esp2:   resd 1
  2695 00013358 <res 00000002>          tss.ss2:    resw 1
  2696 0001335A <res 00000002>          	    resw 1
  2697                                  ; tss offset 28
  2698 0001335C <res 00000004>          tss.CR3:    resd 1
  2699 00013360 <res 00000004>          tss.eip:    resd 1
  2700 00013364 <res 00000004>          tss.eflags: resd 1
  2701                                  ; tss offset 40
  2702 00013368 <res 00000004>          tss.eax:    resd 1		 		
  2703 0001336C <res 00000004>          tss.ecx:    resd 1
  2704 00013370 <res 00000004>          tss.edx:    resd 1
  2705 00013374 <res 00000004>          tss.ebx:    resd 1
  2706 00013378 <res 00000004>          tss.esp:    resd 1
  2707 0001337C <res 00000004>          tss.ebp:    resd 1
  2708 00013380 <res 00000004>          tss.esi:    resd 1
  2709 00013384 <res 00000004>          tss.edi:    resd 1
  2710                                  ; tss offset 72
  2711 00013388 <res 00000002>          tss.ES:     resw 1
  2712 0001338A <res 00000002>          	    resw 1	
  2713 0001338C <res 00000002>          tss.CS:	    resw 1
  2714 0001338E <res 00000002>          	    resw 1
  2715 00013390 <res 00000002>          tss.SS:	    resw 1
  2716 00013392 <res 00000002>          	    resw 1
  2717 00013394 <res 00000002>          tss.DS:	    resw 1
  2718 00013396 <res 00000002>          	    resw 1
  2719 00013398 <res 00000002>          tss.FS:	    resw 1
  2720 0001339A <res 00000002>          	    resw 1
  2721 0001339C <res 00000002>          tss.GS:	    resw 1
  2722 0001339E <res 00000002>          	    resw 1		
  2723 000133A0 <res 00000002>          tss.LDTR:   resw 1
  2724 000133A2 <res 00000002>          	    resw 1
  2725                                  ; tss offset 100		
  2726 000133A4 <res 00000002>          	    resw 1		
  2727 000133A6 <res 00000002>          tss.IOPB:   resw 1
  2728                                  ; tss offset 104 
  2729                                  tss_end:
  2730                                  
  2731 000133A8 <res 00000004>          k_page_dir:  resd 1 ; Kernel's (System) Page Directory address
  2732                                  		    ; (Physical address = Virtual address)	 	
  2733 000133AC <res 00000004>          memory_size: resd 1 ; memory size in pages
  2734 000133B0 <res 00000004>          free_pages:  resd 1 ; number of free pages		
  2735 000133B4 <res 00000004>          next_page:   resd 1 ; offset value in M.A.T. for
  2736                                  		    ; first free page search
  2737 000133B8 <res 00000004>          last_page:   resd 1 ; offset value in M.A.T. which
  2738                                  		    ; next free page search will be
  2739                                  		    ; stopped after it. (end of M.A.T.)
  2740 000133BC <res 00000004>          first_page:  resd 1 ; offset value in M.A.T. which
  2741                                  		    ; first free page search
  2742                                  		    ; will be started on it. (for user)
  2743 000133C0 <res 00000004>          mat_size:    resd 1 ; Memory Allocation Table size in pages		
  2744                                  
  2745                                  ; 02/09/2014 (Retro UNIX 386 v1)
  2746                                  ; 04/12/2013 (Retro UNIX 8086 v1)
  2747 000133C4 <res 00000002>          CRT_START:   resw 1 	  ; starting address in regen buffer
  2748                                  			  ; NOTE: active page only	
  2749 000133C6 <res 00000010>          CURSOR_POSN: resw 8 ; cursor positions for video pages
  2750                                  ACTIVE_PAGE: 
  2751 000133D6 <res 00000001>          ptty: 	     resb 1 ; current tty
  2752                                  ; 01/07/2015 - 29/01/2016
  2753 000133D7 <res 00000001>          ccolor:	     resb 1 ; current color attribute
  2754                                  ; 26/10/2015
  2755                                  ; 07/09/2014
  2756 000133D8 <res 00000014>          ttychr:      resw ntty+2 ; Character buffer (multiscreen)
  2757                                  
  2758                                  ; 18/05/2015 (03/06/2013 - Retro UNIX 8086 v1 feature only!)
  2759 000133EC <res 00000004>          p_time:      resd 1     ; present time (for systime & sysmdate)
  2760                                  
  2761                                  ; 18/05/2015 (16/08/2013 - Retro UNIX 8086 v1 feature only !)
  2762                                  ; (open mode locks for pseudo TTYs)
  2763                                  ; [ major tty locks (return error in any conflicts) ]
  2764 000133F0 <res 00000014>          ttyl:        resw ntty+2 ; opening locks for TTYs.
  2765                                  
  2766                                  ; 15/04/2015 (Retro UNIX 386 v1)
  2767                                  ; 22/09/2013 (Retro UNIX 8086 v1)
  2768 00013404 <res 0000000A>          wlist:       resb ntty+2 ; wait channel list (0 to 9 for TTYs)
  2769                                  ; 15/04/2015 (Retro UNIX 386 v1)
  2770                                  ;; 12/07/2014 -> sp_init set comm. parameters as 0E3h
  2771                                  ;; 0 means serial port is not available 
  2772                                  ;;comprm: ; 25/06/2014
  2773 0001340E <res 00000001>          com1p:       resb 1  ;;0E3h
  2774 0001340F <res 00000001>          com2p:       resb 1  ;;0E3h
  2775                                  
  2776                                  ; 17/11/2015
  2777                                  ; request for response (from the terminal)	
  2778 00013410 <res 00000002>          req_resp:    resw 1 			
  2779                                  ; 07/11/2015
  2780 00013412 <res 00000001>          ccomport:    resb 1 ; current COM (serial) port
  2781                                  		    ; (0= COM1, 1= COM2)
  2782                                  ; 09/11/2015
  2783 00013413 <res 00000001>          comqr:	     resb 1 ; 'query or response' sign (u9.s, 'sndc')
  2784                                  ; 07/11/2015
  2785 00013414 <res 00000002>          rchar:	     resw 1 ; last received char for COM 1 and COM 2		
  2786 00013416 <res 00000002>          schar:	     resw 1 ; last sent char for COM 1 and COM 2
  2787                                  
  2788                                  ; 22/08/2014 (RTC)
  2789                                  ; (Packed BCD)
  2790 00013418 <res 00000001>          time_seconds: resb 1
  2791 00013419 <res 00000001>          time_minutes: resb 1
  2792 0001341A <res 00000001>          time_hours:   resb 1
  2793 0001341B <res 00000001>          date_wday:    resb 1
  2794 0001341C <res 00000001>          date_day:     resb 1
  2795 0001341D <res 00000001>          date_month:   resb 1			
  2796 0001341E <res 00000001>          date_year:    resb 1
  2797 0001341F <res 00000001>          date_century: resb 1
  2798                                  
  2799                                  ; 24/01/2016
  2800 00013420 <res 00000004>          RTC_LH:	       resd 1
  2801 00013424 <res 00000001>          RTC_WAIT_FLAG: resb 1
  2802 00013425 <res 00000001>          USER_FLAG:     resb 1
  2803                                  ; 19/05/2016
  2804                                  ;RTC_second:
  2805 00013426 <res 00000001>          RTC_2Hz:       resb 1 ;  from 2Hz interrupt to 1Hz timer event function	
  2806                                  
  2807                                  %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 00013427 <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 00013428 <res 00000002>      <1> TIMER_LOW:      resw	1               ; LOW WORD OF TIMER COUNT
    31 0001342A <res 00000002>      <1> TIMER_HIGH:     resw	1               ; HIGH WORD OF TIMER COUNT
    32 0001342C <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 0001342D <res 00000001>      <1> SEEK_STATUS:	resb	1
    39 0001342E <res 00000001>      <1> MOTOR_STATUS:	resb	1
    40 0001342F <res 00000001>      <1> MOTOR_COUNT:	resb	1
    41 00013430 <res 00000001>      <1> DSKETTE_STATUS:	resb	1
    42 00013431 <res 00000007>      <1> NEC_STATUS:	resb	7
    43                              <1> 
    44                              <1> ;----------------------------------------
    45                              <1> ;	ADDITIONAL MEDIA DATA		:
    46                              <1> ;----------------------------------------
    47                              <1> 
    48 00013438 <res 00000001>      <1> LASTRATE:	resb 	1
    49 00013439 <res 00000001>      <1> HF_STATUS:	resb 	1
    50 0001343A <res 00000001>      <1> HF_ERROR:	resb 	1
    51 0001343B <res 00000001>      <1> HF_INT_FLAG:	resb 	1
    52 0001343C <res 00000001>      <1> HF_CNTRL:	resb 	1
    53 0001343D <res 00000004>      <1> DSK_STATE:	resb 	4
    54 00013441 <res 00000002>      <1> DSK_TRK:	resb 	2
    55                              <1> 
    56                              <1> ;----------------------------------------
    57                              <1> ;	FIXED DISK DATA AREAS		:
    58                              <1> ;----------------------------------------
    59                              <1> 
    60 00013443 <res 00000001>      <1> DISK_STATUS1:	resb 	1		; FIXED DISK STATUS
    61 00013444 <res 00000001>      <1> HF_NUM:		resb 	1		; COUNT OF FIXED DISK DRIVES
    62 00013445 <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 00013446 <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 00013448 <res 00000004>      <1> HDPM_TBL_VEC:	resd	1 		; Primary master disk param. tbl. pointer
    73 0001344C <res 00000004>      <1> HDPS_TBL_VEC:	resd	1		; Primary slave disk param. tbl. pointer
    74 00013450 <res 00000004>      <1> HDSM_TBL_VEC:	resd	1 		; Secondary master disk param. tbl. pointer
    75 00013454 <res 00000004>      <1> HDSS_TBL_VEC:	resd	1		; Secondary slave disk param. tbl. pointer
    76                              <1> 
    77                              <1> ; 03/01/2015
    78 00013458 <res 00000001>      <1> LBAMode:     	resb	1
    79                              <1> 
    80                              <1> ; *****************************************************************************
  2808                                  
  2809                                  ;;; Real Mode Data (10/07/2015 - BSS)
  2810                                  
  2811                                  ;alignb 2
  2812                                  
  2813                                  ; 10/01/2016
  2814                                  %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: 20/02/2017
     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 00013459 <res 00000003>      <1> alignb 4
    20                              <1> 
    21                              <1> ; MAINPROG.ASM
    22 0001345C <res 00000004>      <1> MainProgCfg_FileSize:   resd 1 ; 14/04/2016
    23 00013460 <res 00000004>      <1> MainProgCfg_LineOffset: resd 1 ; 14/04/2016
    24                              <1> 
    25 00013464 <res 00000004>      <1> Current_VolSerial: resd 1
    26                              <1> 
    27 00013468 <res 00000004>      <1> Current_Dir_FCluster: resd 1
    28                              <1> 
    29 0001346C <res 00000001>      <1> Current_Dir_Level: resb 1
    30 0001346D <res 00000001>      <1> Current_FATType: resb 1
    31 0001346E <res 00000001>      <1> Current_Drv: resb 1
    32 0001346F <res 00000001>      <1> Current_Dir_Drv:   resb 1 ; '?'
    33 00013470 <res 00000001>      <1>                    resb 1 ; ':'
    34 00013471 <res 00000001>      <1> Current_Dir_Root:  resb 1 ; '/' 
    35 00013472 <res 0000005A>      <1> Current_Directory: resb 90
    36 000134CC <res 00000001>      <1> End_Of_Current_Dir_Str: resb 1
    37 000134CD <res 00000001>      <1> Current_Dir_StrLen: resb 1   
    38                              <1> 
    39 000134CE <res 00000001>      <1> CursorColumn: 	resb 1
    40 000134CF <res 00000001>      <1> CmdArgStart:    resb 1
    41                              <1> 
    42                              <1> ; 03/02/2016
    43 000134D0 <res 0000004E>      <1> Remark:		resb 78
    44                              <1> 
    45 0001351E <res 00000050>      <1> CommandBuffer: 	resb 80
    46                              <1> 
    47 0001356E <res 00000100>      <1> TextBuffer:	resb 256
    48                              <1> 
    49                              <1> MasterBootBuff:
    50 0001366E <res 000001BE>      <1> MasterBootCode: resb 1BEh
    51 0001382C <res 00000040>      <1> PartitionTable: resb 64
    52 0001386C <res 00000002>      <1> MBIDCode: resw 1
    53                              <1> 
    54                              <1> PTable_Buffer:
    55 0001386E <res 00000040>      <1> PTable_hd0: resb 64
    56 000138AE <res 00000040>      <1> PTable_hd1: resb 64
    57 000138EE <res 00000040>      <1> PTable_hd2: resb 64
    58 0001392E <res 00000040>      <1> PTable_hd3: resb 64
    59 0001396E <res 00000040>      <1> PTable_ep0: resb 64
    60 000139AE <res 00000040>      <1> PTable_ep1: resb 64
    61 000139EE <res 00000040>      <1> PTable_ep2: resb 64
    62 00013A2E <res 00000040>      <1> PTable_ep3: resb 64
    63                              <1> 
    64 00013A6E <res 00000001>      <1> scount:	resb 1 ; 16/05/2016 (diskio.s, 'int33h:')	
    65 00013A6F <res 00000001>      <1> HD_LBA_yes: resb 1
    66 00013A70 <res 00000001>      <1> PP_Counter: resb 1
    67 00013A71 <res 00000001>      <1> EP_Counter: resb 1
    68                              <1> 
    69 00013A72 <res 00000004>      <1> EP_StartSector: resd 1
    70 00013A76 <res 00000004>      <1>                 resd 1
    71 00013A7A <res 00000004>      <1>                 resd 1
    72 00013A7E <res 00000004>      <1>                 resd 1
    73                              <1> 
    74 00013A82 <res 00000200>      <1> DOSBootSectorBuff: resb 512
    75                              <1> 
    76                              <1> FAT_BuffDescriptor:
    77 00013C82 <res 00000004>      <1> FAT_CurrentCluster: resd 1
    78 00013C86 <res 00000001>      <1> FAT_BuffValidData: resb 1
    79 00013C87 <res 00000001>      <1> FAT_BuffDrvName: resb 1
    80 00013C88 <res 00000002>      <1> FAT_BuffOffset: resw 1
    81 00013C8A <res 00000004>      <1> FAT_BuffSector: resd 1
    82                              <1> 
    83 00013C8E <res 00000004>      <1> FAT_ClusterCounter: resd 1
    84 00013C92 <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 00013C96 <res 00000001>      <1> DirBuff_DRV: resb 1
    92 00013C97 <res 00000001>      <1> DirBuff_FATType: resb 1
    93 00013C98 <res 00000001>      <1> DirBuff_ValidData: resb 1
    94 00013C99 <res 00000002>      <1> DirBuff_CurrentEntry: resw 1
    95 00013C9B <res 00000002>      <1> DirBuff_LastEntry: resw 1
    96 00013C9D <res 00000004>      <1> DirBuff_Cluster: resd 1 
    97 00013CA1 <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 00013CA3 <res 00000004>      <1> FreeClusterCount: resd 1
   109                              <1> 
   110 00013CA7 <res 00000004>      <1> VolSize_Unit1:   resd 1
   111 00013CAB <res 00000004>      <1> VolSize_Unit2:   resd 1
   112                              <1> 
   113 00013CAF <res 00000004>      <1> Vol_Tot_Sec_Str_Start:	    resd 1
   114 00013CB3 <res 0000000A>      <1> Vol_Tot_Sec_Str: 	    resb 10
   115 00013CBD <res 00000001>      <1> Vol_Tot_Sec_Str_End:	    resb 1
   116 00013CBE <res 00000001>      <1> resb 1
   117 00013CBF <res 00000004>      <1> Vol_Free_Sectors_Str_Start: resd 1
   118 00013CC3 <res 0000000A>      <1> Vol_Free_Sectors_Str:	    resb 10				
   119 00013CCD <res 00000001>      <1> Vol_Free_Sectors_Str_End:   resb 1
   120                              <1> 
   121                              <1> ; 10/02/2016
   122 00013CCE <res 00000001>      <1> RUN_CDRV: resb 1 ; CMD_INTR.ASM  ; 09/11/2011
   123                              <1> 
   124                              <1> ; 24/01/2016
   125 00013CCF <res 00000080>      <1> PATH_Array:     resb 128 ; DIR.ASM ; 09/10/2011
   126                              <1> ; 06/02/2016
   127 00013D4F <res 00000004>      <1> CCD_DriveDT:	resd 1 ; DIR.ASM ; (word)
   128 00013D53 <res 00000001>      <1> CCD_Level:	resb 1 ; DIR.ASM
   129 00013D54 <res 00000001>      <1> Last_Dir_Level:	resb 1 ; DIR.ASM
   130                              <1> ;
   131 00013D55 <res 00000002>      <1> CDLF_AttributesMask: resw 1 ; DIR.ASM
   132 00013D57 <res 00000004>      <1> CDLF_FNAddress:	resd 1 ; DIR.ASM (word)
   133 00013D5B <res 00000002>      <1> CDLF_DEType:	resw 1 ; DIR.ASM
   134                              <1> ;
   135 00013D5D <res 00000001>      <1> CD_COMMAND:	resb 1 ; DIR.ASM
   136                              <1> 
   137 00013D5E <res 00000002>      <1> alignb 4
   138                              <1> 
   139                              <1> ; 29/01/2016
   140 00013D60 <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 00013D61 <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 00013D62 <res 00000001>      <1> retry_count: 	resb 1 ; DISK_IO.ASM ; 20/07/2011 (CHS_RetryCount)
   148 00013D63 <res 00000001>      <1> disk_rw_err: 	resb 1 ; DISK_IO.ASM ; (Disk_IO_err_code)
   149 00013D64 <res 00000004>      <1> sector_count:	resd 1 ; DISK_IO.ASM ; (Disk_RW_SectorCount)
   150                              <1> 
   151                              <1> ; 06/02/2016 (long name)
   152 00013D68 <res 00000002>      <1> FDE_AttrMask:	   resw 1 ; DIR.ASM
   153 00013D6A <res 00000002>      <1> AmbiguousFileName: resw 1 ; DIR.ASM
   154 00013D6C <res 00000001>      <1> PreviousAttr:	   resb 1 ; DIR.ASM
   155                              <1> ;	
   156 00013D6D <res 00000001>      <1> LongNameFound:   resb 1	  ; DIR.ASM
   157 00013D6E <res 00000001>      <1> LFN_EntryLength: resb 1   ; DIR.ASM
   158 00013D6F <res 00000001>      <1> LFN_CheckSum:    resb 1   ; DIR.ASM
   159 00013D70 <res 00000084>      <1> LongFileName:    resb 132 ; DIR.ASM
   160                              <1> 
   161                              <1> ;PATH_Array_Ptr: resw 1 ; DIR.ASM
   162 00013DF4 <res 00000001>      <1> PATH_CDLevel:	 resb 1 ; DIR.ASM
   163 00013DF5 <res 00000001>      <1> PATH_Level:	 resb 1 ; DIR.ASM
   164                              <1> 
   165                              <1> ; 07/02/2016
   166 00013DF6 <res 0000000D>      <1> Dir_File_Name:	resb 13 ; DIR.ASM ; 09/10/2011
   167                              <1> 
   168                              <1> ; 10/02/2016
   169 00013E03 <res 0000000D>      <1> Dir_Entry_Name:	resb 13 ; DIR.ASM
   170                              <1> 
   171                              <1> alignb 2
   172                              <1> 
   173 00013E10 <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 00013E12 <res 00000001>      <1> FindFile_Drv:		  resb 1
   179 00013E13 <res 00000041>      <1> FindFile_Directory:	  resb 65
   180 00013E54 <res 0000000D>      <1> FindFile_Name:		  resb 13
   181                              <1> FindFile_LongNameEntryLength:
   182 00013E61 <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 00013E62 <res 00000002>      <1> FindFile_AttributesMask:  resw 1
   186 00013E64 <res 00000020>      <1> FindFile_DirEntry:	  resb 32
   187 00013E84 <res 00000004>      <1> FindFile_DirFirstCluster: resd 1
   188 00013E88 <res 00000004>      <1> FindFile_DirCluster:	  resd 1
   189 00013E8C <res 00000002>      <1> FindFile_DirEntryNumber:  resw 1
   190 00013E8E <res 00000002>      <1> FindFile_MatchCounter:	  resw 1
   191 00013E90 <res 00000002>      <1> FindFile_Reserved:	  resw 1 ; 06/03/2016
   192                              <1> 
   193 00013E92 <res 00000004>      <1> First_Path_Pos: resd 1	; DIR.ASM ; 09/10/2011
   194 00013E96 <res 00000004>      <1> Last_Slash_Pos: resd 1	; DIR.ASM 
   195                              <1> 
   196                              <1> ; 10/02/2016
   197 00013E9A <res 00000002>      <1> File_Count:     resw 1 	; DIR.ASM ; 09/10/2011
   198 00013E9C <res 00000002>      <1> Dir_Count:      resw 1
   199 00013E9E <res 00000004>      <1> Total_FSize:    resd 1
   200 00013EA2 <res 00000004>      <1> TFS_Dec_Begin:  resd 1
   201 00013EA6 <res 0000000A>      <1>                 resb 10
   202 00013EB0 <res 00000001>      <1> TFS_Dec_End:    resb 1
   203                              <1> 
   204 00013EB1 <res 00000001>      <1> PrintDir_RowCounter: resb 1
   205                              <1> 
   206 00013EB2 <res 00000002>      <1> alignb 4
   207                              <1> ; 15/02/2015 ('show' command variables)
   208 00013EB4 <res 00000004>      <1> Show_FDT:	resd 1
   209 00013EB8 <res 00000004>      <1> Show_LDDDT:	resd 1
   210 00013EBC <res 00000004>      <1> Show_Cluster:	resd 1
   211 00013EC0 <res 00000004>      <1> Show_FileSize:	resd 1
   212 00013EC4 <res 00000004>      <1> Show_FilePointer: resd 1
   213 00013EC8 <res 00000002>      <1> Show_ClusterPointer: resw 1
   214 00013ECA <res 00000002>      <1> Show_ClusterSize: resw 1
   215 00013ECC <res 00000001>      <1> Show_RowCount:	resb 1
   216                              <1> 
   217 00013ECD <res 00000003>      <1> alignb 4
   218                              <1> ; 21/02/2016
   219 00013ED0 <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 00013ED4 <res 00000004>      <1> DelFile_FCluster:	resd 1
   223 00013ED8 <res 00000002>      <1> DelFile_EntryCounter:	resw 1
   224 00013EDA <res 00000001>      <1> DelFile_LNEL:		resb 1
   225 00013EDB <res 00000001>      <1> resb 1
   226                              <1> 
   227                              <1> ; DIR.ASM
   228 00013EDC <res 00000004>      <1> mkdir_DirName_Offset: 	resd 1
   229 00013EE0 <res 00000004>      <1> mkdir_FFCluster:	resd 1
   230 00013EE4 <res 00000004>      <1> mkdir_LastDirCluster:	resd 1
   231 00013EE8 <res 00000004>      <1> mkdir_FreeSectors:	resd 1
   232 00013EEC <res 00000002>      <1> mkdir_attrib:		resw 1 
   233 00013EEE <res 00000001>      <1> mkdir_SecPerClust:	resb 1
   234 00013EEF <res 00000001>      <1> mkdir_add_new_cluster:	resb 1
   235 00013EF0 <res 0000000D>      <1> mkdir_Name:		resb 13
   236 00013EFD <res 00000002>      <1> resw 1 ; 01/03/2016
   237                              <1> ; 27/02/2016
   238 00013EFF <res 00000001>      <1> RmDir_MultiClusters:	resb 1  
   239 00013F00 <res 00000004>      <1> RmDir_DirEntryOffset:	resd 1 ; 01/03/2016 (word -> dword)
   240 00013F04 <res 00000004>      <1> RmDir_ParentDirCluster: resd 1
   241 00013F08 <res 00000004>      <1> RmDir_DirLastCluster:   resd 1
   242 00013F0C <res 00000004>      <1> RmDir_PreviousCluster:  resd 1
   243                              <1> ; 22/02/2016
   244 00013F10 <res 00000001>      <1> UPDLMDT_CDirLevel:	resb 1
   245 00013F11 <res 00000004>      <1> UPDLMDT_CDirFCluster:	resd 1
   246                              <1> 	
   247 00013F15 <res 00000003>      <1> alignb 4
   248                              <1> ; DRV_FAT.ASM ; 21/08/2011
   249 00013F18 <res 00000004>      <1> gffc_next_free_cluster:  resd 1
   250 00013F1C <res 00000004>      <1> gffc_first_free_cluster: resd 1
   251 00013F20 <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 00013F24 <res 00000004>      <1> ClusterValue:	resd 1
   257                              <1> ; 04/03/2016
   258 00013F28 <res 00000001>      <1> Attributes:	resb 1 
   259                              <1> ;;CFS_error:  resb 1 ;; 01/03/2016
   260 00013F29 <res 00000001>      <1> resb 1
   261 00013F2A <res 00000001>      <1> CFS_OPType: resb 1
   262 00013F2B <res 00000001>      <1> CFS_Drv:    resb 1
   263 00013F2C <res 00000004>      <1> CFS_CC:	    resd 1
   264 00013F30 <res 00000004>      <1> CFS_FAT32FSINFOSEC: resd 1
   265 00013F34 <res 00000004>      <1> CFS_FAT32FC: resd 1
   266                              <1> 
   267                              <1> ; 27/02/2016
   268                              <1> ;alignb 4
   269 00013F38 <res 00000004>      <1> glc_prevcluster: resd 1 ; DRV_FAT.ASM (21/08/2011)
   270                              <1> ; 22/10/2016
   271 00013F3C <res 00000004>      <1> glc_index:	 resd 1 ;  Last Cluster Index (22/10/2016)	
   272                              <1> 
   273                              <1> ; DIR.ASM
   274 00013F40 <res 00000002>      <1> DLN_EntryNumber: resw 1
   275 00013F42 <res 00000001>      <1> DLN_40h:	 resb 1
   276                              <1> ; 28/02/2016
   277 00013F43 <res 00000001>      <1> TCC_FATErr:	 resb 1 ; DRV_FAT.ASM
   278                              <1> 
   279                              <1> alignb 4
   280                              <1> ; DIR.ASM (09/10/2011)
   281 00013F44 <res 00000002>      <1> LCDE_EntryIndex: resw 1 ; LCDE_EntryOffset
   282 00013F46 <res 00000002>      <1> LCDE_ClusterSN:  resw 1
   283 00013F48 <res 00000004>      <1> LCDE_Cluster: 	 resd 1
   284 00013F4C <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 00013F50 <res 00000004>      <1> SourceFilePath:	     resd 1
   290 00013F54 <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 00013F58 <res 00000001>      <1> SourceFile_Drv:			resb 1
   297 00013F59 <res 00000041>      <1> SourceFile_Directory:		resb 65
   298 00013F9A <res 0000000D>      <1> SourceFile_Name:		resb 13
   299                              <1> SourceFile_LongNameEntryLength: 
   300 00013FA7 <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 00013FA8 <res 00000002>      <1> SourceFile_AttributesMask:	resw 1
   304 00013FAA <res 00000020>      <1> SourceFile_DirEntry:		resb 32
   305 00013FCA <res 00000004>      <1> SourceFile_DirFirstCluster:	resd 1
   306 00013FCE <res 00000004>      <1> SourceFile_DirCluster:		resd 1
   307 00013FD2 <res 00000002>      <1> SourceFile_DirEntryNumber:	resw 1
   308 00013FD4 <res 00000002>      <1> SourceFile_MatchCounter:	resw 1
   309                              <1> ; 16/03/2016
   310 00013FD6 <res 00000001>      <1> SourceFile_SecPerClust:		resb 1
   311 00013FD7 <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 00013FD8 <res 00000001>      <1> DestinationFile_Drv:		resb 1
   316 00013FD9 <res 00000041>      <1> DestinationFile_Directory: 	resb 65
   317 0001401A <res 0000000D>      <1> DestinationFile_Name:		resb 13
   318                              <1> DestinationFile_LongNameEntryLength:
   319 00014027 <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 00014028 <res 00000002>      <1> DestinationFile_AttributesMask: resw 1
   323 0001402A <res 00000020>      <1> DestinationFile_DirEntry:	resb 32
   324 0001404A <res 00000004>      <1> DestinationFile_DirFirstCluster: resd 1
   325 0001404E <res 00000004>      <1> DestinationFile_DirCluster:	resd 1
   326 00014052 <res 00000002>      <1> DestinationFile_DirEntryNumber: resw 1
   327 00014054 <res 00000002>      <1> DestinationFile_MatchCounter:	resw 1
   328                              <1> ; 16/03/2016
   329 00014056 <res 00000001>      <1> DestinationFile_SecPerClust:	resb 1
   330 00014057 <res 00000001>      <1> DestinationFile_Reserved:	resb 1
   331                              <1> ; Above is 128 bytes
   332                              <1> 
   333                              <1> ; 24/04/2016
   334 00014058 <res 00000002>      <1> resw 1
   335                              <1> 
   336                              <1> ; 10/03/2016
   337                              <1> ; FILE.ASM
   338 0001405A <res 00000001>      <1> move_cmd_phase:	   resb 1
   339 0001405B <res 00000001>      <1> msftdf_sf_df_drv:  resb 1
   340 0001405C <res 00000004>      <1> msftdf_drv_offset: resd 1
   341                              <1> 
   342                              <1> ; 11/03/2016
   343                              <1> ; DRV_FAT.ASM (21/08/2011)
   344 00014060 <res 00000004>      <1> FAT_anc_LCluster:  resd 1
   345 00014064 <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 00014068 <res 00000004>      <1> mem_ipg_count:	resd 1 ; page count (for contiguous allocation)
   353 0001406C <res 00000004>      <1> mem_pg_count:	resd 1 ; page count (for count down)
   354 00014070 <res 00000004>      <1> mem_aperture:	resd 1 ; contiguous free pages (current)
   355 00014074 <res 00000004>      <1> mem_max_aperture: resd 1 ; maximum value of contiguous free pages
   356 00014078 <res 00000004>      <1> mem_pg_pos:	resd 1 ; mem. position (page #) of current aperture
   357 0001407C <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 00014080 <res 00000001>      <1> copy_cmd_phase:       resb 1
   362 00014081 <res 00000001>      <1> csftdf_rw_err:	      resb 1
   363 00014082 <res 00000001>      <1> DestinationFileFound: resb 1
   364 00014083 <res 00000001>      <1> csftdf_cdrv: 	      resb 1
   365 00014084 <res 00000004>      <1> csftdf_filesize:      resd 1
   366                              <1> ; TRDOS386 (TRDOS v2.0)
   367 00014088 <res 00000004>      <1> csftdf_sf_mem_addr:   resd 1
   368 0001408C <res 00000004>      <1> csftdf_sf_mem_bsize:  resd 1
   369                              <1> ;
   370                              <1> 
   371 00014090 <res 00000004>      <1> csftdf_sf_cluster:    resd 1 ; 16/03/2016
   372 00014094 <res 00000004>      <1> csftdf_df_cluster:    resd 1
   373                              <1> ; 16/03/2016
   374 00014098 <res 00000004>      <1> csftdf_r_size:        resd 1
   375 0001409C <res 00000004>      <1> csftdf_w_size:        resd 1
   376 000140A0 <res 00000004>      <1> csftdf_sf_rbytes:     resd 1
   377 000140A4 <res 00000004>      <1> csftdf_df_wbytes:     resd 1
   378 000140A8 <res 00000001>      <1> csftdf_percentage:    resb 1
   379                              <1> ; 17/03/2016
   380 000140A9 <res 00000001>      <1> csftdf_videopage:     resb 1
   381 000140AA <res 00000002>      <1> csftdf_cursorpos:     resw 1
   382 000140AC <res 00000004>      <1> csftdf_sf_drv_dt:     resd 1
   383 000140B0 <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 000140B4 <res 00000004>      <1> createfile_Name_Offset:  resd 1
   389 000140B8 <res 00000004>      <1> createfile_FreeSectors:  resd 1 
   390 000140BC <res 00000004>      <1> createfile_size:         resd 1
   391 000140C0 <res 00000004>      <1> createfile_FFCluster:    resd 1 ; 11/03/2016
   392 000140C4 <res 00000004>      <1> createfile_LastDirCluster: resd 1
   393 000140C8 <res 00000004>      <1> createfile_Cluster:      resd 1
   394 000140CC <res 00000004>      <1> createfile_PCluster:     resd 1
   395 000140D0 <res 00000001>      <1> createfile_attrib:	 resb 1
   396 000140D1 <res 00000001>      <1> createfile_SecPerClust:  resb 1
   397 000140D2 <res 00000002>      <1> createfile_DirIndex:     resw 1
   398 000140D4 <res 00000004>      <1> createfile_CCount:	 resd 1
   399 000140D8 <res 00000002>      <1> createfile_BytesPerSec:	 resw 1 ; 23/03/2016
   400 000140DA <res 00000001>      <1> createfile_wfc:	         resb 1
   401 000140DB <res 00000001>      <1> createfile_UpdatePDir:	 resb 1 ; 31/03/2016
   402                              <1> 
   403                              <1> ;alignb 4
   404                              <1> 
   405                              <1> ; 11/04/2016
   406 000140DC <res 00000002>      <1> env_var_length:	   resw 1
   407                              <1> 
   408 000140DE <res 00000002>      <1> alignb 4
   409                              <1> 
   410                              <1> ; 25/04/2016
   411 000140E0 <res 00000001>      <1> readi.valid:	resb 1 ; valid data (>0 = valid for readi)
   412 000140E1 <res 00000001>      <1> readi.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   413 000140E2 <res 00000001>      <1> readi.spc:	resb 1 ; sectors per cluster for 'readi' drive
   414 000140E3 <res 00000001>      <1> readi.s_index:  resb 1 ; sector index in current cluster (buffer)
   415 000140E4 <res 00000004>      <1> readi.sector:	resd 1 ; current disk sector
   416 000140E8 <res 00000002>      <1> readi.bpc:	resw 1 ; bytes per cluster - 1
   417 000140EA <res 00000002>      <1> readi.offset:	resw 1 ; byte offset in cluster buffer
   418 000140EC <res 00000004>      <1> readi.cluster:  resd 1 ; current cluster number
   419 000140F0 <res 00000004>      <1> readi.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   420 000140F4 <res 00000004>      <1> readi.fclust:	resd 1 ; first cluster of the current cluster
   421 000140F8 <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 000140FC <res 00000001>      <1> writei.valid:	resb 1 ; valid data (>0 = valid for writei)
   427 000140FD <res 00000001>      <1> writei.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   428 000140FE <res 00000001>      <1> writei.spc:	resb 1 ; sectors per cluster for 'writei' drive
   429 000140FF <res 00000001>      <1> writei.s_index: resb 1 ; sector index in current cluster (buffer)
   430 00014100 <res 00000004>      <1> writei.sector:	resd 1 ; current disk sector
   431 00014104 <res 00000002>      <1> writei.bpc:	resw 1 ; bytes per cluster - 1
   432 00014106 <res 00000002>      <1> writei.offset:	resw 1 ; byte offset in cluster buffer
   433 00014108 <res 00000004>      <1> writei.cluster: resd 1 ; current cluster number
   434 0001410C <res 00000004>      <1> writei.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   435 00014110 <res 00000004>      <1> writei.fclust:  resd 1 ; first cluster of the current cluster
   436 00014114 <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 00014118 <res 00000004>      <1> writei.lclust:	resd 1 ; writei last cluster (mget_w) ; 23/10/2016
   439 0001411C <res 00000004>      <1> writei.l_index:	resd 1 ; writei last cluster index (mget_w) ; 23/10/2016
   440 00014120 <res 00000001>      <1> writei.ofn:	resb 1 ; open file number (to be written) ; 23/10/2016
   441                              <1> 
   442 00014121 <res 00000003>      <1> alignb 4
   443                              <1> 
   444                              <1> ; 29/04/2016
   445 00014124 <res 00000004>      <1> Run_CDirFC:	resd 1
   446 00014128 <res 00000001>      <1> Run_Auto_Path:	resb 1
   447 00014129 <res 00000001>      <1> Run_Manual_Path: resb 1 ; 0 -> auto path sequence needed
   448 0001412A <res 00000001>      <1> EXE_ID:		resb 1	
   449 0001412B <res 00000001>      <1> EXE_dot:	resb 1
   450                              <1> 
   451                              <1> ; 06/05/2016
   452 0001412C <res 00000004>      <1> mainprog_return_addr: resd 1
   453 00014130 <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 00014134 <res 00000004>      <1> video_eax:	resd 1  ; eax return value of video function
   458                              <1> 
   459                              <1> ; 01/06/2016
   460 00014138 <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 0001413C <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 0001413D <res 00000001>      <1> p_change:	resb 1  ; process change status (for timer events)
   467                              <1> ; 23/05/2016 - TRDOS 386 ('clock')
   468 0001413E <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 0001413F <res 00000001>      <1> timer_events:	resb 1  ; number of (active) timer events, <= 16		
   472                              <1> 
   473                              <1> ; 24/06/2016
   474 00014140 <res 00000001>      <1> w_str_cmd:	resb 1	; WRITE_STRING command (0,1,2,3) ; video.s
   475 00014141 <res 00000001>      <1> p_crt_mode:	resb 1  ; previous video mode (=3 or 0), backup mark/sign
   476                              <1> ; 26/06/2016
   477 00014142 <res 00000001>      <1> p_crt_page:	resb 1  ; previous active page (for 'set_mode')
   478                              <1> ; 04/07/2016
   479 00014143 <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 00014144 <res 00000002>      <1> CRT_LEN:	resw 1  ; length of regen buffer in bytes
   484 00014146 <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 00014156 <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 0001415A <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 0001415B <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 0001415C <res 00000004>      <1> FFF_UBuffer:	resd 1  ; User's buffer address for FFF & FNF system calls 
   504                              <1> ; 15/10/2016
   505 00014160 <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 00014161 <res 00000001>      <1> FFF_Attrib:	resb 1	; Find First File attributes for Find Next File (LB)
   512 00014162 <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 00014163 <res 00000001>      <1> SWP_inv_fname:	resb 1	; Set Working Path - Invalid File Name
   515 00014164 <res 00000002>      <1> SWP_Mode:	resw 1	; Set Working Path - Mode
   516 00014166 <res 00000001>      <1> SWP_DRV:	resb 1	; Set Working Path - Drive	
   517 00014167 <res 00000001>      <1> SWP_DRV_chg:	resb 1	; Set Working Path - Drive Change
   518                              <1> 
   519                              <1> ; 08/10/2016
   520 00014168 <res 00000009>      <1> device_name:    resb 9  ; capitalized (and zero padded) device canem 
   521                              <1> 			; (example: "TTY0",0,0,0,0,0")
   522                              <1> 
   523 00014171 <res 00000003>      <1> alignb 4
   524                              <1> 
   525                              <1> ; 08/10/2016
   526                              <1> ; 07/10/2016
   527                              <1> ; Table of kernel devices (which do not use installable device drivers)
   528                              <1> ; has been coded into KERNEL (trdosk9.s) 
   529                              <1> ; 07/10/2016
   530                              <1> ; 8 installable device drivers available to install (NUMIDEV)
   531 00014174 <res 00000020>      <1> IDEV_PGDIR: resd NUMIDEV
   532                              <1> 			; Page directories of installable device drivers
   533                              <1> 			;
   534                              <1> 			; Note: Virtual start address is always 400000h
   535                              <1> 			; (end of the 1st 4MB). [org 400000h]
   536                              <1> 			; Segments: KCODE, KDATA
   537                              <1> 			; Method: call 400000h (after changing page dir) 	
   538                              <1> 			; Query code located at the start (400000h).
   539                              <1> 			; Query code returns with
   540                              <1> 			;   eax = device type and driver version
   541                              <1> 			;         AL = Device Type minor
   542                              <1> 			;         AH = Device Type major
   543                              <1> 			;         Byte 16-23 : Version minor
   544                              <1> 			;	  Byte 24-31 : Version major - 1
   545                              <1> 			;		       (0:0 -> 1.0)
   546                              <1> 			;   ebx = initialization code address
   547                              <1> 			;   ecx = configuration table address
   548                              <1> 			;   edx = description table address
   549                              <1> 			;   esi = device (default) name address (ASCIIZ)
   550                              <1> 			;	 (name has "/DEV/" prefix)		
   551                              <1> 			;   edi = dispatch table address
   552                              <1> 			;        (for calling kernel-device functions)
   553                              <1> 			;   ebp = address table address
   554                              <1> 			; Initialization code returns with
   555                              <1> 			;   eax = open code address
   556                              <1> 			;   ecx = close code address 
   557                              <1> 			;   ebx = read code address
   558                              <1> 			;   edx = write code address 	
   559                              <1> 			;   esi = IOCTL code address
   560                              <1> 			;   edi = dispatch table address
   561                              <1> 			;   ebp = address table address
   562                              <1> 			; Address Table:
   563                              <1> 			;    Offset 0  : open code address
   564                              <1> 			;    Offset 4  : read code address
   565                              <1> 			;    Offset 8  : write code address
   566                              <1> 			;    Offset 12 : close code address
   567                              <1> 			;    Offset 16 : IOCTL code address
   568                              <1> 			;    Offset 20 : initialization code address
   569                              <1> 			;    Offset 24 : description table address
   570                              <1> 			;    Offset 28 : configuration table address
   571                              <1> 			;    Offset 32 : device name address
   572                              <1> 			;    Offset 36 : dispatch table address
   573                              <1> 			;          (for calling kernel-device functions)
   574                              <1> 
   575 00014194 <res 00000040>      <1> IDEV_NAME:  resb 8*NUMIDEV 
   576                              <1> 			; 8 byte names of installable device drivers
   577                              <1> 
   578 000141D4 <res 00000008>      <1> IDEV_TYPE:  resb NUMIDEV ; Driver type of installable device drivers
   579 000141DC <res 00000008>      <1> IDEV_FLAGS: resb NUMIDEV ; Device access parameters for installable
   580                              <1>                          ; device drivers (These values are set while
   581                              <1> 			 ; the device driver is being loaded.)
   582 000141E4 <res 00000020>      <1> IDEV_OADDR: resd NUMIDEV ; open function addr for installable dev driver
   583 00014204 <res 00000020>      <1> IDEV_CADDR: resd NUMIDEV ; close function addr for installable dev driver
   584 00014224 <res 00000020>      <1> IDEV_RADDR: resd NUMIDEV ; read function addr for installable dev driver
   585 00014244 <res 00000020>      <1> IDEV_WADDR: resd NUMIDEV ; write function addr for installable dev driver
   586                              <1> 	
   587                              <1> ; 08/10/2016	
   588                              <1> ; 07/10/2016
   589                              <1> ; Device Open and Access parameters
   590 00014264 <res 0000001E>      <1> DEV_ACCESS:	 resb NUMOFDEVICES   ; bit 0 = accessable by normal users
   591                              <1> 				     ; bit 1 = read access permission
   592                              <1> 				     ; bit 2 = write access permission
   593                              <1> 				     ; bit 3 = IOCTL permission to users
   594                              <1> 				     ; bit 4 = block device if it is set	
   595                              <1> 				     ; bit 5 = 16 bit or 1024 byte data
   596                              <1> 				     ; bit 6 = 32 bit or 2048 byte data
   597                              <1> 				     ; bit 7 = installable device driver
   598 00014282 <res 0000001E>      <1> DEV_R_OWNER:	 resb NUMOFDEVICES   ; Reading owner no (u.uid) of devices		
   599 000142A0 <res 0000001E>      <1> DEV_R_OPENCOUNT: resb NUMOFDEVICES   ; Reading open count 
   600 000142BE <res 0000001E>      <1> DEV_W_OWNER:	 resb NUMOFDEVICES   ; Writing owner no (u.uid) of devices		
   601 000142DC <res 0000001E>      <1> DEV_W_OPENCOUNT: resb NUMOFDEVICES   ; Writing open count
   602 000142FA <res 0000001E>      <1> DEV_DRIVER:	 resb NUMOFDEVICES   ; device driver number (1 to 7Fh)
   603                              <1> 				     ; *if bit 7 is set (80 to FFh)
   604                              <1> 				     ; *if it is installable device driver
   605                              <1> 				     ; *index (0 to 7Fh)
   606                              <1> 				     ; otherwise it is kernel device index
   607 00014318 <res 0000001E>      <1> DEV_OPENMODE:	 resb NUMOFDEVICES   ; 1 = read mode
   608                              <1> 				     ; 2 = write mode
   609                              <1> 				     ; 3 = read & write 	  
   610                              <1> 				     ; 0 = not open (free)		
   611 00014336 <res 00000078>      <1> DEV_NAME_PTR:    resd NUMOFDEVICES   ; pointers to name addresses of drivers
   612                              <1> 				     ; Address base: KDEV_NAME+		
   613                              <1> 				     ; or IDEV_NAME+
   614 000143AE <res 00000078>      <1> DEV_R_POINTER:	 resd NUMOFDEVICES   ; reading pointer, writing pointer	
   615 00014426 <res 00000078>      <1> DEV_W_POINTER:	 resd NUMOFDEVICES   ; sector number if block device
   616                              <1> 				     ; character offset if char device
   617 0001449E <res 00000002>      <1> alignb 4
   618                              <1> 
   619                              <1> ; 06/10/2016
   620                              <1> ; Open File Parameters
   621 000144A0 <res 00000028>      <1> OF_FCLUSTER:	resd OPENFILES  ; First clusters of open files
   622 000144C8 <res 0000000A>      <1> OF_DRIVE:	resb OPENFILES  ; Logical DOS drive numbers of open files 
   623 000144D2 <res 0000000A>      <1> OF_MODE:	resb OPENFILES  ; Open mode (1 = read, 2 = write, 3 = r&w) 
   624 000144DC <res 0000000A>      <1> OF_STATUS:	resb OPENFILES  ; (bit 0 = read, bit 1 = write)
   625 000144E6 <res 0000000A>      <1> OF_OPENCOUNT:	resb OPENFILES  ; Open counts of open files
   626 000144F0 <res 00000028>      <1> OF_POINTER:	resd OPENFILES	; File seek/read/write pointer
   627 00014518 <res 00000028>      <1> OF_SIZE:	resd OPENFILES	; File sizes of open files (in bytes)
   628 00014540 <res 00000028>      <1> OF_DIRFCLUSTER:	resd OPENFILES  ; Directory First Clusters of open files
   629 00014568 <res 00000028>      <1> OF_DIRCLUSTER:	resd OPENFILES  ; Directory (Entry) Clusters of open files
   630 00014590 <res 00000028>      <1> OF_VOLUMEID:	resd OPENFILES  ; Vol ID for removable drives of open files
   631 000145B8 <res 00000028>      <1> OF_CCLUSTER:	resd OPENFILES  ; Current clusters of open files
   632 000145E0 <res 00000028>      <1> OF_CCINDEX:	resd OPENFILES  ; Cluster index numbers of current clusters
   633                              <1> ; 24/10/2016
   634 00014608 <res 00000014>      <1> OF_DIRENTRY:	resw OPENFILES  ; Directory entry index no. in dir cluster 
   635                              <1> 				; Sector index = entry index / 16
   636                              <1> ;alignb 2
   637                              <1> 
   638 0001461C <res 00000060>      <1> DTA:		resd 24		; Find First File data transfer area
   639                              <1> 
   640                              <1> ; 19/12/2016
   641 0001467C <res 00000001>      <1> tcallback:	resb 1		; Timer callback method flag for 'systimer'
   642 0001467D <res 00000001>      <1> trtc:		resb 1		; Timer interrupt type flag for 'systimer'
   643                              <1> ; 20/02/2017
   644 0001467E <res 00000001>      <1> no_page_swap:	resb 1		; Swap lock for Signal Response Byte pages 
   645                              <1> ;;15/01/2017
   646                              <1> ; 02/01/2017
   647                              <1> ;;intflg:	resb 1		; software interrupt in progress signal
   648                              <1> 				; (for timer interrupt)
  2815                                  ; 24/01/2016
  2816                                  %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: 13/01/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; 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 0001467F <res 00000001>      <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 00014680 <res 00000002>      <1> 	i.flgs:	 resw 1
    37 00014682 <res 00000001>      <1> 	i.nlks:	 resb 1
    38 00014683 <res 00000001>      <1> 	i.uid:	 resb 1
    39                              <1>         ;i.size:  resw 1 ; size
    40 00014684 <res 00000002>      <1> 	resw 1 ; 29/04/2016
    41 00014686 <res 00000010>      <1> 	i.dskp:	 resw 8 ; 16 bytes
    42 00014696 <res 00000004>      <1> 	i.ctim:	 resd 1
    43 0001469A <res 00000004>      <1> 	i.mtim:	 resd 1
    44 0001469E <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 000146A0 <res 00000020>      <1>         p.pid:   resw nproc
    58 000146C0 <res 00000020>      <1>         p.ppid:  resw nproc
    59 000146E0 <res 00000020>      <1>         p.break: resw nproc
    60 00014700 <res 00000010>      <1>         p.ttyc:  resb nproc ; console tty in Retro UNIX 8086 v1.
    61 00014710 <res 00000010>      <1> 	p.waitc: resb nproc ; waiting channel in Retro UNIX 8086 v1.
    62 00014720 <res 00000010>      <1> 	p.link:	 resb nproc
    63 00014730 <res 00000010>      <1> 	p.stat:	 resb nproc
    64                              <1> 
    65                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 feature only !) 
    66 00014740 <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 00014780 <res 00000010>      <1> 	p.timer: resb nproc ; number of timer events of the processs
    71                              <1> 
    72                              <1> 	; 19/12/2016
    73 00014790 <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 000147D0 <res 000001F4>      <1> fsp:	 resb nfiles * 10 ; 11/05/2015 (8 -> 10)
   107 000149C4 <res 00000002>      <1> idev:	 resw 1 ; device number is 1 byte in Retro UNIX 8086 v1 !
   108 000149C6 <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 000149C8 <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 000149C9 <res 00000001>      <1> mdev:	 resb 1 ; mounted device number ; Retro UNIX 8086 v1 feature only!
   124                              <1> ; 15/04/2015
   125 000149CA <res 00000001>      <1> active:	 resb 1 
   126 000149CB <res 00000001>      <1> 	 resb 1 ; 09/06/2015
   127 000149CC <res 00000002>      <1> mnti:	 resw 1
   128 000149CE <res 00000002>      <1> mpid:	 resw 1
   129 000149D0 <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 000149D2 <res 00000002>      <1> runq_event:	 resw 1 ; high priority, 'run for event'            ; 2
   134 000149D4 <res 00000002>      <1> runq_normal:	 resw 1 ; normal/regular priority, 'run as reqular' ; 1
   135 000149D6 <res 00000002>      <1> runq_background: resw 1 ; low priority, 'run on background'         ; 0
   136                              <1> ;
   137 000149D8 <res 00000001>      <1> imod:	 resb 1
   138 000149D9 <res 00000001>      <1> smod:	 resb 1
   139 000149DA <res 00000001>      <1> mmod:	 resb 1
   140 000149DB <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 000149DC <res 00000004>      <1> 	u.sp:	  resd 1 ; esp (kernel stack at the beginning of 'sysent')
   164 000149E0 <res 00000004>      <1> 	u.usp:	  resd 1 ; esp (kernel stack points to user's registers)
   165 000149E4 <res 00000004>      <1> 	u.r0:	  resd 1 ; eax
   166 000149E8 <res 00000002>      <1> 	u.cdir:	  resw 1
   167 000149EA <res 0000000A>      <1> 	u.fp:	  resb 10
   168 000149F4 <res 00000004>      <1> 	u.fofp:	  resd 1
   169 000149F8 <res 00000004>      <1> 	u.dirp:	  resd 1
   170 000149FC <res 00000004>      <1> 	u.namep:  resd 1
   171 00014A00 <res 00000004>      <1> 	u.off:	  resd 1
   172 00014A04 <res 00000004>      <1> 	u.base:	  resd 1
   173 00014A08 <res 00000004>      <1> 	u.count:  resd 1
   174 00014A0C <res 00000004>      <1> 	u.nread:  resd 1
   175 00014A10 <res 00000004>      <1> 	u.break:  resd 1 ; break
   176 00014A14 <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 00014A16 <res 00000001>      <1> 	u.ttyn:	  resb 1 ; 28/07/2013 - Retro Unix 8086 v1 feature only !
   180 00014A17 <res 00000001>      <1> 	u.resb:   resb 1 ; 10/01/2017 (TRDOS 386, temporary)
   181 00014A18 <res 00000010>      <1> 	u.dirbuf: resb 16 ; 04/12/2015 (10 -> 16) 
   182                              <1> 	;u.pri:	  resw 1 ; 14/02/2014
   183 00014A28 <res 00000001>      <1> 	u.quant:  resb 1 ; Retro UNIX 8086 v1 Feature only ! (uquant)
   184 00014A29 <res 00000001>      <1> 	u.pri:	  resb 1 ; Modification: 21/05/2016 (priority levels: 0, 1, 2)
   185 00014A2A <res 00000002>      <1> 	u.intr:	  resw 1
   186 00014A2C <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 00014A2E <res 00000002>      <1> 	u.cdrv:	  resw 1 ; cdev
   190 00014A30 <res 00000001>      <1> 	u.uid:	  resb 1 ; uid
   191 00014A31 <res 00000001>      <1> 	u.ruid:	  resb 1
   192 00014A32 <res 00000001>      <1> 	u.bsys:	  resb 1
   193 00014A33 <res 00000001>      <1> 	u.uno:	  resb 1
   194 00014A34 <res 00000004>      <1>         u.upage:  resd 1 ; 16/04/2015 - Retro Unix 386 v1 feature only !
   195 00014A38 <res 00000004>      <1> 	u.pgdir:  resd 1 ; 09/03/2015 (page dir addr of process)
   196 00014A3C <res 00000004>      <1> 	u.ppgdir: resd 1 ; 06/05/2015 (page dir addr of the parent process)
   197 00014A40 <res 00000004>      <1> 	u.pbase:  resd 1 ; 20/05/2015 (physical base/transfer address)
   198 00014A44 <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 00014A46 <res 00000001>      <1> 	u.kcall:  resb 1 ; The caller is 'namei' (dskr) or 'mkdir' (dskw) sign		
   205 00014A47 <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 00014A48 <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 00014A4C <res 00000004>      <1> 	u.pfcount: resd 1 ; page fault count for (this) process (for sys geterr)
   218                              <1> 		; 19/12/2016 (TRDOS 386)	
   219 00014A50 <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 00014A54 <res 00000001>      <1> 	u.t_lock: resb 1 ; Timer interrupt (callback) lock (unlocked by 'sysrele')
   222 00014A55 <res 00000001>      <1> 	u.t_mode: resb 1 ; running mode during timer interrupt (0= system, 0FFh= user) 
   223                              <1> 
   224 00014A56 <res 00000002>      <1> alignb 4
   225                              <1> 
   226                              <1> U_SIZE	equ $ - user
   227                              <1> 
   228                              <1> ; 18/10/2015 - Retro UNIX 386 v1 (local variables for 'namei' and 'sysexec')
   229 00014A58 <res 00000004>      <1> pcore:  resd 1 ; physical start address of user's memory space (for sys exec)
   230 00014A5C <res 00000004>      <1> ecore:  resd 1 ; physical start address of user's memory space (for sys exec)
   231 00014A60 <res 00000004>      <1> nbase:	resd 1	; physical base address for 'namei' & 'sysexec'
   232 00014A64 <res 00000002>      <1> ncount: resw 1	; remain byte count in page for 'namei' & 'sysexec'
   233 00014A66 <res 00000002>      <1> argc:	resw 1	; argument count for 'sysexec'
   234 00014A68 <res 00000004>      <1> argv:	resd 1	; argument list (recent) address for 'sysexec'
   235                              <1> 
   236                              <1> ; 03/06/2015 - Retro UNIX 386 v1 Beginning
   237                              <1> ; 07/04/2013 - 31/07/2013 - Retro UNIX 8086 v1
   238 00014A6C <res 00000001>      <1> rw: 	 resb 1 ;; Read/Write sign (iget)
   239                              <1> 
   240                              <1> ;alignb 4
   241                              <1> 
   242                              <1> ; 24/04/2016
   243 00014A6D <res 00000004>      <1> ii:		resd 1 ; first cluster of the program file
   244 00014A71 <res 00000004>      <1> i.size:		resd 1 ; size of the program file
  2817                                  
  2818 00014A75 <res 00000003>          alignb 4
  2819                                  
  2820                                  ; 23/05/2016 (TRDOS 386)
  2821                                  ; 14/10/2015 (Retro UNIX 386 v1, 'unix386.s')
  2822 00014A78 <res 00000004>          cr3reg:	 resd 1  ; cr3 register content at the beginning of the timer
  2823                                  		 ; (or RTC) interrupt handler.
  2824                                  
  2825                                  ; 10/12/2016 (callback)
  2826                                  ; 10/06/2016
  2827                                  ; 19/05/2016
  2828                                  ; 18/05/2016 - TRDOS 386 feature only !
  2829 00014A7C <res 00000100>          timer_set: resd 16*4   ; 256 bytes memory space for 16 timer events
  2830                                  	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  2831                                  	;       Owner:	        resb 1 ; 0 = free
  2832                                  	;		  	       ;>0 = process number (u.uno)
  2833                                  	;	Callback:	resb 1 ; 0 = response byte address (phy)
  2834                                  	;				 1 = callback address (virtual)				
  2835                                  	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  2836                                  	;		   	       ; 1 = Real Time Clock interrupt 
  2837                                  	;	Response:       resb 1 ; 0 to 255, signal return value
  2838                                  	;	Count Limit:	resd 1 ; count of ticks (total/set)
  2839                                  	;	Current Count: 	resd 1 ; count of ticks (current)
  2840                                  	;	Response Addr:  resd 1 ; response byte (pointer) address
  2841                                  	;			       ; (or callback -user service- address)	
  2842                                  
  2843                                  ;; Memory (swap) Data (11/03/2015)
  2844                                  ; 09/03/2015
  2845 00014B7C <res 00000002>          swpq_count: resw 1 ; count of pages on the swap queue
  2846 00014B7E <res 00000004>          swp_drv:    resd 1 ; logical drive description table address of the swap drive/disk
  2847 00014B82 <res 00000004>          swpd_size:  resd 1 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  2848 00014B86 <res 00000004>          swpd_free:  resd 1 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  2849 00014B8A <res 00000004>          swpd_next:  resd 1 ; next free page block
  2850 00014B8E <res 00000004>          swpd_last:  resd 1 ; last swap page block	
  2851                                  
  2852 00014B92 <res 00000002>          alignb 4
  2853                                  
  2854                                  ; 10/07/2015
  2855                                  ; 28/08/2014
  2856 00014B94 <res 00000004>          error_code:	resd 1
  2857                                  ; 29/08/2014
  2858 00014B98 <res 00000004>          FaultOffset: 	resd 1
  2859                                  ; 21/09/2015
  2860 00014B9C <res 00000004>          PF_Count:	resd 1	; total page fault count
  2861                                  		       	; (for debugging - page fault analyze)
  2862                                  		 	; 'page_fault_handler' (memory.inc)
  2863                                  			; 'sysgeterr' (u9.s)
  2864                                  
  2865                                  ; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
  2866                                  ; 22/08/2015 (Retro UNIX 386 v1)
  2867                                  buffer: 
  2868 00014BA0 <res 00000008>          	resb	8 
  2869                                  readi_buffer:
  2870 00014BA8 <res 00000200>          	resb 	512
  2871 00014DA8 <res 00000008>          	resb	8
  2872                                  writei_buffer:
  2873 00014DB0 <res 00000200>          	resb	512	
  2874                                  ; 24/10/2016
  2875 00014FB0 <res 00000008>          	resb	8 
  2876                                  rw_buffer:
  2877 00014FB8 <res 00000800>          	resb 	2048  ; general purposed, r/w sector buffer
  2878                                  
  2879                                  bss_end:
  2880                                  
  2881                                  ; 27/12/2013
  2882                                  _end:  ; end of kernel code
