Copyright(C) 1994,1995,1996,1997 Terumasa KODAKA , Takeshi KONO
■ IO.SYS work area
Explanation o The contents of the IO.SYS work area are not disclosed at all. Therefore,
compatibility of the work area is not guaranteed. Except in special cases,
avoid referencing or manipulating this work area.
o Even when DOS=HIGH is specified in MS-DOS 5.0, the work area segment shown
here remains unchanged at 0060h.
u Depending on the product version of MS-DOS, some work area addresses may
differ from those shown here.
Memory 0060:0020h (WORD)
Applicable MS-DOS 3.3D, MS-DOS 5.0 or later
Contents MS-DOS product number
Explanation INT DCh - Value returned to AX by Function 12h.
Related
Memory 0060:0022h (BYTE)
Applicable to MS-DOS 5.0 or later
Contents Internal revision number
Explanation INT DCh - Function 15h Value returned to AL by Subfunction 0000h.
Related
Memory 0060:0030h (BYTE)
Target EMM.SYS
Contents NEC B0000h bank EMS automatic switching flag
00h = When a process starts, automatically switch the B0000h bank to G-VRAM
01h = When a process starts, do not automatically switch the B0000h bank to G-VRAM
Explanation When software emulation EMS is implemented in EMM.SYS, this setting determines
whether to automatically switch B0000-BFFFFh from the EMS page frame to G-VRAM
when a process starts.
Related
Memory 0060:0031h (BYTE)
Target MS-DOS 3.3, 5.0 or later
Contents Implemented protected mode memory capacity of up to 16MB (unit: 128KB)
Explanation Value read by INT DCh - Function 81h Subfunction 0000h.
Related
Memory 0060:0038h (BYTE)
Target
Contents Logical drive (FD) overlapping allocation status
00h = Physical drive (FD) and logical drive correspond one-to-one
FFh = Two logical drives are assigned to one physical drive (FD)
Explanation When only one drive exists, two logical drives are assigned to one physical drive (FD).
This status is shown. Also valid for PC-98LT/HA. The difference with 0060:013Bh is unknown.
Related INT DCh - Function 13h
INT DCh - Function 73h
Memory 0060:0046h (WORD)
Target PC-98HA
Contents PC-98HA BPRAM access permission flag
0000h = Access prohibited
0001h = Access permitted
Explanation The setting status of INT DCh - Function 74h.
Related
Memory 0060:0052h (WORD)
Target ADDDRV.EXE
Contents Resident segment of ADDDRV.EXE
Explanation
Related
Memory 0060:0068h (WORD)
Target PS98-121 or later (normal), PS98-011 or later (high resolution)
Contents RS-232C channel 0 AUX protocol
bits 15-12: unused
bits 11-8: communication speed
1001b=19200bps ■ 19200bps compatible devices
1000b=9600bps
0111b=4800bps
0110b=2400bps
0101b=1200bps
0100b= 600bps
0011b= 300bps
0010b= 150bps
0001b= 75bps
bit 7-6: stop bit length (01=1 bit, 11=2 bits)
bit 5 : Parity (1=even, 0=odd)
bit 4 : Parity (1=yes, 0=no)
bit 3-2: Data bit length (10=7 bits, 11=8 bits)
bit 1 : Communication method (0=full duplex, 1=half duplex)
bit 0 : X flow control (1=yes, 0=no)
Explanation When MS-DOS starts, the state of memory switch 1 is copied.
INT DCh - Function 0Ah(2/2), INT DCh - Function 0Eh The setting of Subfunction 01h is saved here.
Related 0060:17EEh
Memory 0060:006C-007Bh (16 bytes)
Target All MS-DOS
Contents A:-P: DA/UA
Explanation o Contents of offset +00-+0Fh of the list obtained by INT DCh - Function 13h.
Even in versions that do not support INT DCh - Function 13h, the DA/UA list is
always stored in this area.
o In DB-P1, the following values are stored.
-----------+-------+---------------------------------------------------
Address | Value | Contents
-----------+-------+---------------------------------------------------
0060:006Ch | F0h | DA/UA of A: (FDD: 640KB I/F mode, only 640KB access possible)
0060:006Dh | F1h | DA/UA of B: (RAM drive: 640KB I/F mode, only 640KB access possible)
0060:006Eh | D0h | DA/UA of C: (ROM drive)
0060:006Fh | 00h |
: | 00h |
0060:007Bh | 00h |
-----------+-------+---------------------------------------------------
Related INT DCh - Function 13h
Memory 0060:0082h (BYTE)
Target PC-98LT/HA
Contents Disc change display replacement flag
Explanation INT DCh - Function 12h (2/2) setting status
Related 0060:0090h
Memory 0060:008Ah (BYTE)
Target
Contents Kanji/Graph mode flag
00h = Graphic character display mode
(Set with escape sequence ESC+")3")
01h = Shift JIS kanji display mode
(Set with escape sequence ESC+")0")
Explanation
Related
Memory 0060:008Bh (BYTE)
Target
Contents Graph character mode display character (ASCII code)
Explanation Characters displayed at the bottom left of the screen in graph character display mode.
In kanji mode, ' ' (20h) is stored, and in graph mode, 'g' (67h) is stored.
Related
Memory 0060:008Ch (BYTE)
Target
Contents Shift function display character (ASCII code)
Explanation Characters displayed at the bottom left of the screen when the shift function definition is displayed.
Normally ' ' (20h) is stored, but when the shift function is displayed, '*' (2Ah) is stored.
Related 0060:0111h
Memory 0060:0090h (DWORD)
Target PC-98LT/HA
Contents User routine for displaying disc changes
Explanation Address set by DS:DX in INT DCh - Function 12h (2/2)
Related 0060:0082h
Memory 0060:00A4h (BYTE)
Target
Contents Flag to prevent re-entry of STOP key interrupt
00h = Not processing
01h = Processing
Explanation
Related
Memory 0060:00B3h (BYTE)
Target PS98-XA125
Contents INT DCh processing flag
00h = not processing
01h = processing
Explanation
Related
Memory 0060:00B4h (BYTE)
Target PS98-121 or later
Contents INT DCh processing flag
00h = not processing
01h = processing
Explanation
Related
Memory 0060:0106h (BYTE)
Target
Contents Special input mode
00h = normal input
01h = [CTRL] + [f･5] waits for 1 hexadecimal character input
FFh = [CTRL] + [XFER] waits for hexadecimal kanji input (when FEP is not built in)
Explanation
Related 0060:0109h
0060:010Ah
Memory 0060:0107h (BYTE)
Target
Contents [CTRL]+[P]/[N] mode
00h = Do not output simultaneously to the printer
01h = Output simultaneously to the printer
Explanation Pressing [CTRL]+[P]/[N] toggles the mode.
Related
Memory 0060:0109h (BYTE)
Target
Contents Work area for hexadecimal conversion in special input mode
Explanation
Related 0060:0106h
Memory 0060:010Ah (WORD)
Target
Contents Offset address of subroutine used in special input mode
Explanation
Related 0060:0106h
Memory 0060:010Ch (BYTE)
Target PS98-125 or later
Contents [CTRL]+[XFER]･[NFER]/Function key soft key/cancel flag
bit 1:[CTRL]+[XFER]･[NFER] soft key/cancel status
1 = [CTRL]+[XFER]･[NFER] input can be obtained from application
(Set with INT DCh - Function 0Fh Subfunction 0002h)
0 = [CTRL]+[XFER]･[NFER] input is occupied by MS-DOS (default)
(Set with INT DCh - Function 0Fh Subfunction 0003h)
bit 0: [CTRL] + function key is softkey status
1 = [CTRL] + function key input can be obtained from application
(Set by INT DCh - Function 0Fh Subfunction 0000h)
0 = [CTRL] + function key operation is monopolized by MS-DOS (default)
(Set by INT DCh - Function 0Fh Subfunction 0001h)
Explanation Setting status of INT DCh - Function 0Fh.
Related
Memory 0060:0110h (BYTE)
Target
Content Cursor position Y coordinate
Explanation Row position with the top of the screen as 0.
Related 0060:018Dh
Memory 0060:0111h (BYTE)
Target
Content Function definition display status flag
00h = Do not display function key definition (Set with escape sequence ESC+"[>1h")
01h = Display function key definition (default) (Set with escape sequence ESC+"[>1l")
02h = Display shift function key definition
Explanation
Related 0060:008Ch
Memory 0060:0112h (BYTE)
Target
Content Scroll range lower limit
Explanation Specifies the line position with the top of the screen being 0.
The function key definition is displayed on the line immediately below the scroll range lower limit.
Normally equal to the number of lines displayed on the screen excluding the function key display area - 1.
Related
Memory 0060:0113h (BYTE)
Target
Contents Number of screen lines
00h = 20 normal lines (set with escape sequence ESC+"[>3h")
25 high-resolution lines (set with escape sequence ESC+"[>3l")
01h = 25 normal lines (set with escape sequence ESC+"[>3l")
31 high-resolution lines (set with escape sequence ESC+"[>3n")
Explanation
Related
Memory 0060:0114h (BYTE)
Target
Contents Erase attribute
Explanation Character attribute when escape sequence ESC+"[m" is issued. Normally E1h. 81h when memory switch 3 bit 6=1 (text screen green).
Related 0060:0119h
0060:011Dh
Memory 0060:0115h (BYTE)
Target
Contents Kanji upper byte storage flag
00h = normal state
01h = waiting for lower byte of kanji
Explanation
Related 0060:0116h
Memory 0060:0116h (BYTE)
Target
Contents Kanji upper byte storage work
Explanation When the first byte of kanji is received, the upper byte is stored here and a flag is set at 0060:0115h.
Related
Memory 0060:0117h (BYTE)
Target
Contents Line wrap flag
00h = When a line exceeds 80 characters, move the cursor to the left end of the line below
(Set with escape sequence ESC+"[?7h": Undocumented)
01h = When a line exceeds 80 characters, do not display the excess
(Set with escape sequence ESC+"[?7l": Undocumented)
Explanation
Related
Memory 0060:0118h (BYTE)
Target
Contents Scroll speed
00h = Normal
01h = Slow
Explanation Scroll speed setting status toggled by [CTRL] + [f･9].
Related
Memory 0060:0119h (BYTE)
Target
Contents Erase character (ASCII code)
Explanation Character used when erasing the screen and when filling from the end of a line to the right edge of the screen. Usually ' ' (20h).
Related 0060:0114h
0060:011Dh
Memory 0060:011Bh (BYTE)
Target
Content Cursor display state
00h = No display (set with escape sequence ESC+"[>5h")
01h = Display (set with escape sequence ESC+"[>5l")
Explanation
Related
Memory 0060:011Ch (BYTE)
Target
Content X coordinate of cursor position
Explanation Column position with the left edge of the screen at 0
Related 0060:018Eh
Memory 0060:011Dh (BYTE)
Target
Content Display attribute
Explanation When a character attribute is specified with escape sequence ESC+"["+<character attribute>+"m", the text VRAM attribute is stored.
Related INT DCh - Function 10h Subfunction 02h
0060:013Ch
Memory 0060:011Eh (BYTE)
Target
Contents Upper limit of scroll range
Explanation Specifies the line position with the top of the screen being 0.
Related
Memory 0060:011Fh (WORD)
Target
Contents Wait value when scrolling
0001h = When scroll speed is normal
E000h = When scroll speed is slow
Explanation
Related 0060:0118h
Memory 0060:0126h (BYTE)
Target
Contents Save cursor Y coordinate
Explanation The position of the cursor saved with the escape sequence ESC + "[s". The line position with the top of the screen being 0.
Related
Memory 0060:0127h (BYTE)
Target
Contents Save cursor X coordinate
Explanation The position of the cursor saved with the escape sequence ESC + "[s". The column position with the left edge of the screen being 0.
Related
Memory 0060:012Bh (BYTE)
Target
Contents Save cursor attribute
Explanation Attribute saved with escape sequence ESC+"[s".
Related
Memory 0060:0136h (BYTE)
Target PS98-011 or later
Contents Drive number last accessed by block device driver in IO.SYS
Explanation Contents of offset +50h of list obtained by INT DCh - Function 13h.
Related
Memory 0060:013Bh (BYTE)
Target PS98-011 or later
Contents Logical drive (FD) overlapping allocation status
00h = Physical drive (FD) and logical drive correspond one-to-one
FFh = Two logical drives are assigned to one physical drive (FD)
Explanation Contents of offset + 4Fh of the list obtained by INT DCh - Function 13h.
The difference with 0060:0038h is unknown.
Related
Memory 0060:013Ch(WORD)
Applicable to MS-DOS 3.3C or later
Contents Display attribute in extended attribute mode
Explanation
Related INT DCh - Function 10h Subfunction 02h
0060:011Dh
Memory 0060:013Eh(WORD)
Applicable to MS-DOS 3.3C or later
Contents Erase attribute in extended attribute mode
Explanation
Related INT DCh - Function 10h Subfunction 02h
0060:0114h
Memory 0060:018Dh(BYTE)
Applicable to PS98-XA125
Contents Cursor position Y coordinate
Explanation Row position with the top of the screen as 0.
Related 0060:0110h
Memory 0060:018Eh(BYTE)
Target PS98-XA125
Content X-coordinate of cursor position
Explanation Column position with the left edge of the screen at 0
Related 0060:011Ch
Memory 0060:0253h (BYTE)
Applicable to MS-DOS 5.0 or later
Contents 5"MO connection status
-------------+-------
Bit position | SCSI ID
-------------+-------
bit 7 | 7
bit 6 | 6
bit 5 | 5
bit 4 | 4
bit 3 | 3
bit 2 | 2
bit 1 | 1
bit 0 | 0
-------------+-------
1 = Yes
0 = No
Explanation Indicates the SCSI ID to which the 5"MO is connected.
Related 0060:03E7h
Memory 0060:026A-02A9h (64 BYTEs)
Applicable to MS-DOS 5.0 or later
Contents MO drive information
-----------+------------
Offset | Contents
-----------+------------
026A-0279h | MO drive #1
027A-0289h | MO drive #2
028A-0299h | MO drive #3
029A-02A9h | MO drive #4
-----------+------------
Explanation Stores information for 16 bytes x 4 drives. Details of contents are unknown.
Related INT DCh - Function 09h Subfunction 0001h
0060:9178h
Memory 0060:03E7h (BYTE)
Applicable to MS-DOS 5.0 or later
Contents 3.5"MO connection status
-------------+-------
Bit position | SCSI ID
-------------+-------
bit 7 | 7
bit 6 | 6
bit 5 | 5
bit 4 | 4
bit 3 | 3
bit 2 | 2
bit 1 | 1
bit 0 | 0
-------------+-------
1 = Yes
0 = No
Explanation Indicates the SCSI ID to which the 3.5"MO is connected.
Related 0060:0253h
Memory 0060:03E9-03F0h (8 bytes)
Applicable to MS-DOS 3.3D, 5.0 and later
Content MO drive eject lock counter (SCSI ID 0-7)
-------+-------
Offset | SCSI ID
-------+-------
03E9h | 0
03EAh | 1
03EBh | 2
03ECh | 3
03EDh | 4
03EEh | 5
03EFh | 6
03F0h | 7
-------+-------
00h = Not eject locked
01h or more = Number of times eject locked
Explanation Incremented each time INT DCh - Function 09h Subfunction 0010h is executed, and INT DCh - Function 09h Subfunction It is decremented each time
0011h is executed. When it reaches 00H during decrement, the eject lock is released.
Related
Memory 0060:05D6h (WORD)
Target MS-DOS 3.3C
Contents Extended attribute mode
0000h=PC mode (default)
(Set by INT DCh - Function 14h Subfunction 0001h)
0001h=EGH mode
(Set by INT DCh - Function 14h Subfunction 0000h)
Explanation The value of this word does not match the AX value specified by
INT DCh - Function 14h Subfunction 0000h,0001h.
Related
Memory 0060:05D8h (WORD)
Applicable to MS-DOS 5.0 or later
Contents Text mode
0000h = 25 lines of space between lines
(Set with INT DCh - Function 14h Subfunction 0010h)
0001h = 20/25 lines (default)
(Set with INT DCh - Function 14h Subfunction 0010h)
Explanation
Related
Memory 0060:17EEh (WORD)
Applicable to MS-DOS 3.3 or later
Contents RS-232C channel 1 AUX protocol
Explanation The structure is the same as 0060:0068h. However, the communication speed is not stored.
Related 0060:0068h
INT DCh - Function 0Eh Subfunction n1,n6h
Memory 0060:17F0h (WORD)
Applicable to MS-DOS 3.3 or later
Contents RS-232C channel 2 AUX protocol
Explanation The structure is the same as 0060:0068h. However, the communication speed is not stored.
Related 0060:0068h
INT DCh - Function 0Eh Subfunction n1,n6h
Memory 0060:17FAh (WORD)
Applicable to RSDRV.SYS
Contents RS-232C channel 1, 2 driver segment
Explanation If this value is 0000h, the AUX driver does not support channels 1 and 2.
Related
Memory 0060:1802h (WORD)
Target RSDRV.SYS
Contents RSDRV.SYS segment
Explanation When this value is 0000h, RSDRV.SYS is not installed.
Related
Memory 0060:19FBh (WORD)
Target PS98-011 or later
Contents Presence or absence of BRANCH 4670 virtual drive
00h = None
Other than 00h = Present
Explanation Value returned to AL by INT DCh - Function 80h Subfunction 8000h.
Related
Memory 0060:1A50-1ACFh (128 bytes)
Target MS-DOS 3.3, 5.0 or later
Contents First physical sector number list of SCSI HD/MO active partition
Explanation Contents from offset +50h onwards of the list obtained by INT DCh - Function 80h Subfunction 0000h.
Related
Memory 0060:1B50-1B56h (7 BYTEs)
Applicable to MS-DOS 3.3, 5.0 and later
Contents SCSI HD/MO active partition count list
Explanation Contents of the list obtained by INT DCh - Function 80h Subfunction 0000h after offset +04h.
Related
Memory 0060:1D29h (BYTE)
Applicable to MS-DOS 3.3B, 3.3D
Contents Number of SCSI HD logical drives
Explanation Contents of the list obtained by INT DCh - Function 80h Subfunction 0000h after offset +0Fh.
Related
Memory 0060:1DA9h (BYTE)
Applicable to MS-DOS 5.0 and later
Contents Number of SCSI HD logical drives
Explanation Contents of the list obtained by INT DCh - Function 80h Subfunction 0000h after offset +0Fh.
Related
Memory 0060:1D3B-1D42h (8 bytes)
Target MS-DOS 3.3D
Contents SCSI device type list
-------+-------
Offset | SCSI ID
-------+-------
1D3Bh | 0
1D3Ch | 1
1D3Dh | 2
1D3Eh | 3
1D3Fh | 4
1D40h | 5
1D41h | 6
1D42h | 7
-------+-------
Explanation INT DCh - Function 09h Stores the device type list obtained by Subfunction 0000h.
Related 0060:1DBB-1DC2h
Memory 0060:1D44h(BYTE)
Target MS-DOS 3.3D
Contents Number of 5"MOs connected
Explanation
Related 0060:1DC4h
Memory 0060:1DBB~1DC2h(8 BYTEs)
Target MS-DOS 5.0 or later
Contents SCSI device type list
-------+-------
Offset | SCSI ID
-------+-------
1DBBh | 0
1DBCh | 1
1DBDh | 2
1DBEh | 3
1DBFh | 4
1DC0h | 5
1DC1h | 6
1DC2h | 7
-------+-------
Explanation INT DCh - Function 09h Stores the device type list obtained by Subfunction 0000h.
Related 0060:1D3B~1D42h
Memory 0060:1DC4h(BYTE)
Target MS-DOS 5.0 or later
Contents Total number of 3.5"MO and 5"MO units connected Explanation
Related 0060:1D44h
Memory 0060:1E50h(BYTE)
Target PS98-011 or later
Contents Installation status of Japanese input FEP included with MS-DOS
00h=Not installed
01h=Installed
Explanation INT DCh - Function 80h Value returned to AL by Subfunction 8002h.
Related
Memory 0060:1E57h (BYTE)
Target PS98-127 or later
Contents Printer mode
bit 7
1 = Do not output CR/LF to printer when [CTRL]+[P]/[N] is pressed even number of times
(Set by INT DCh - Function 11h Subfunction 0020h)
0 = Output CR/LF to printer when [CTRL]+[P]/[N] is pressed even number of times (default)
(Set by INT DCh - Function 11h Subfunction 0021h)
bit 1
1 = Print kanji vertically
(Set by INT DCh - Function 11h Subfunction 0010h)
0 = Print kanji horizontally (default)
(Set by INT DCh - Function 11h Subfunction 0011h)
bit 0
1 = Character width ratio of kanji:ANK is 1.5:1
(Set by INT DCh - Function 11h Subfunction 0000h)
0 = Kanji:ANK character width ratio 2:1 (default)
(INT DCh - Function 11h Subfunction 0001h)
Explanation
Related 0060:23F1h
Memory 0060:23F1h(BYTE)
Target PS98-XA125
Content Printer mode
bit 1
1 = Kanji vertical printing
(INT DCh - Function 11h Subfunction 0010h)
0 = Kanji horizontal printing (default)
(INT DCh - Function 11h Subfunction 0011h)
bit 0
1 = Kanji:ANK character width ratio=1.5:1
(INT DCh - Function 11h Subfunction 0000h)
0 = Kanji:ANK character width ratio=2:1 (default)
(INT DCh - Function 11h Subfunction Set with 0001h)
Explanation
Related INT DCh - Function 11h
0060:1E57h
Memory 0060:27D2h(BYTE)
Target PS98-011 or later
Content Unknown
Explanation INT DCh - Function 80h Value returned to AL with Subfunction 8001h.
Related
Memory 0060:2820h(DWORD)
Target PS98-011 or later
Content Pointer to DA/UA list
Explanation Pointer to the area that holds the data from offset + 1Ah onwards of the list obtained with INT DCh - Function 13h(1/2).
Related 0060:2C86h
Memory 0060:2A88 to 2AC7h (64 bytes)
Target PS98-011 or later
Contents List of first physical sector numbers of SASI/ESDI/IDE HD active partitions
Explanation Contents of offset +10 to 4Fh of the list obtained by INT DCh - Function 80h Subfunction 0000h.
Related
Memory 0060:2B48 to 2B4Bh (4 bytes)
Target PS98-011 or later
Contents Number of active partitions on SASI/ESDI/IDE HD
Explanation Contents of offset +00 to 03h of the list obtained by INT DCh - Function 80h Subfunction 0000h.
Related
Memory 0060:2C86-2CB9h (52 bytes)
Target PS98-011 or later
Contents DA/UA from A: to Z:
Explanation INT DCh - Contents of offset +1A to +4Dh of the list obtained by Function 13h.
Related 0060:2820h
Memory 0060:8DEFh (bytes)
Target MS-DOS 3.3D
Contents 5"MO connection status
-------------+-------
Bit position | SCSI ID
-------------+-------
bit 7 | 7
bit 6 | 6
bit 5 | 5
bit 4 | 4
bit 3 | 3
bit 2 | 2
bit 1 | 1
bit 0 | 0
-------------+-------
1 = Yes
0 = No
Explanation Indicates the SCSI ID to which the 5"MO is connected.
Related 0060:0253h
0060:03E7h
Memory 0060:9178-9197h (64 BYTEs)
Applicable to MS-DOS 5.0 or later
Contents MO drive information
-----------+------------
Offset | Contents
-----------+------------
9178-9187h | MO drive #1
9188-9197h | MO drive #2
-----------+------------
Explanation Stores information for 16 bytes x 2 drives. Details of contents are unknown.
Related INT DCh - Function 09h Subfunction 0001h
0060:026Ah