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AH = 04h BX = task ID or FFFFh for calling task
Return:
CF clear if successful ES = segment of Task Control Block (TCB) (see #04006) CF set on error AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
Note: Superseded by AH=27h
See Also:
AH=02h - AH=27h - AH=28h - AH=29h -
Format of PC-MOS/386 Task Control Block:
Offset Size Description (Table 04006)
00h BYTE signature byte "H" if allocated from system memory pool
01h BYTE header block ID, "T" = TCB
02h WORD length of block in paragraphs
04h WORD segment address of next header block (0000h if last)
06h WORD segment address of previous header block (0000h if first)
08h WORD pointer to next TCB
0Ah WORD pointer to previous TCB
0Ch WORD pointer to associated TCB (if applicable)
0Eh WORD reserved
---TCB---
10h WORD TCB task ID
12h WORD native context save area
14h WORD start address of task
16h WORD end address of task
18h BYTE task priority
19h BYTE task time slice
1Ah BYTE "TCBWAIT" run status of task
1Bh BYTE "TCBSTAT" what the task is waiting for
1Ch DWORD address of polling routine
20h BYTE error code from last function call
21h 11 BYTEs name of currently executing task
2Ch 4 BYTEs ???
30h BYTE keyboard disabled if bit 1 set
31h BYTE current shift state and toggles
32h 2 BYTEs ???
34h BYTE current video mode
35h BYTE current video page
36h BYTE number of text columns per screen
37h BYTE number of text rows per screen
38h WORD length of video buffer
3Ah WORD video page length
3Ch WORD apge start address in video RAM
3Eh 4 WORDs current cursor positions for four screen pages
46h 8 BYTEs ???
4Eh WORD current cursor type
50h BYTE current palette setting
51h BYTE original video mode
52h BYTE start CRT row (00h or 01h)
53h BYTE video RAM in task active
54h WORD handle of video save area
56h WORD page count of video save area
58h WORD segment address of video save area
5Ah WORD poitner to first Task File Block (see #04009)
5Ch WORD pointer to first Current Directory Block (see #04012)
5Eh WORD pointer to active Current Directory Block (see #04012)
60h BYTE number of drives
61h BYTE current drive (0=A:, etc.)
62h DWORD disk transfer address
66h 4 BYTEs ???
6Ah BYTE verify flag (nonzero = on)
6Bh BYTE break flag (nonzero = on)
6Ch WORD share/lock retry count
6Eh WORD ticks between share/lock retries
70h BYTE remote printer flags (see #04007)
71h BYTE ETX/ACK delay count
72h WORD spooler segment address
74h 2 BYTEs ???
76h 3 BYTEs remote printer redirection for LPT1 through LPT3 (see #04008)
79h 2 BYTEs ???
7Bh DWORD offset of username in TCB
7Fh BYTE current output class
80h 7 BYTEs protection access rights, 2 bits per class (writeable!)
87h 122 BYTEs ???
101h BYTE TCB sleep downcounter value
102h 20 BYTEs ???
116h BYTE last scan code.
...
5D0h DWORD far pointer to Device Driver Terminal's entry point
5D4h WORD offset of logical screen
5D6h WORD segment of logical screen
5D8h WORD cursor offset within page
5DAh BYTE screen columns
5DBh WORD async port number (0000h = none)
5DDh DWORD physical baudrate
5E1h 19 BYTEs reserved for Device Driver Terminal (DDT).
...
7A6h DWORD far pointer to unregister calling chain
Bitfields for PC-MOS/386 remote printer flags:
Bit(s) Description (Table 04007)
0 LPT1 to terminal
1 LPT2 to terminal
2 LPT3 to terminal
3 escape to printer pending
4 use XON/XOFF
5 use ETX/ACK
6 waiting for ACK or XON
7 transparent printing on
(Table 04008)
Values for PC-MOS/386 remote printer redirection:
00h not redirected
01h redirected to COM1
...
18h redirected to COM24
51h redirected to LPT1
52h redirected to LPT2
53h redirected to LPT3
Format of PC-MOS/386 Task File Block:
Offset Size Description (Table 04009)
00h BYTE signature byte "H" if allocated from system memory pool
01h BYTE header block ID, "F" = task file block
02h WORD length of block in paragraphs
04h WORD segment address of next header block (0000h if last)
06h WORD segment address of previous header block (0000h if first)
08h WORD pointer to next TCB
0Ah WORD pointer to previous TCB
0Ch WORD pointer to associated TCB (if applicable)
0Eh WORD reserved
---TFB---
10h WORD segment address of next TFB
12h WORD segment address of previous TFB
14h WORD segment address of TFB's Global File Block (see #04011)
16h WORD segment address of owner's PSP
18h WORD file handle
1Ah 3 BYTEs ???
1Dh DWORD file position
21h 4 BYTEs ???
25h BYTE IOCTL flags (see #04010)
26h 2 BYTEs ???
Bitfields for PC-MOS/386 IOCTL flags:
Bit(s) Description (Table 04010)
0 stdin
1 stdout
2 null device
3 clock device
4 reserved
5 ASCII mode instead of binary
6 EOF encountered on input
7 device rather than file
Format of PC-MOS/386 Global File Block:
Offset Size Description (Table 04011)
00h BYTE signature byte "H" if allocated from system memory pool
01h BYTE header block ID, "G" = global file block
02h WORD length of block in paragraphs
04h WORD segment address of next header block (0000h if last)
06h WORD segment address of previous header block (0000h if first)
08h WORD pointer to next TCB
0Ah WORD pointer to previous TCB
0Ch WORD pointer to associated TCB (if applicable)
0Eh WORD reserved
---GFB---
10h 10 BYTEs ???
1Ah WORD file attribute
1Ch BYTE ???
1Dh DWORD address of device driver
21h WORD first cluster
23h WORD time of last modification
25h WORD date of last modification
27h DWORD size of file in bytes
2Bh 11 BYTEs ???
36h 11 BYTEs device name or FCB-format filename
41h WORD segment address of TFB list
43h WORD segment address of first RLB (see #04014) (0000h = none)
45h BYTE flag:
Format of PC-MOS/386 Current Directory Block:
Offset Size Description (Table 04012)
00h BYTE signature byte "H" if allocated from system memory pool
01h BYTE header block ID, "C" = current directory block
02h WORD length of block in paragraphs
04h WORD segment address of next header block (0000h if last)
06h WORD segment address of previous header block (0000h if first)
08h WORD pointer to next TCB
0Ah WORD pointer to previous TCB
0Ch WORD pointer to associated TCB (if applicable)
0Eh WORD reserved
---CDB---
10h BYTE drive number
11h BYTE ???
12h 64 BYTEs directory name
52h WORD first directory cluster (0000h = root)
Format of PC-MOS/386 Block Device Block:
Offset Size Description (Table 04013)
00h BYTE signature byte "H" if allocated from system memory pool
01h BYTE header block ID, "B" = block device block
02h WORD length of block in paragraphs
04h WORD segment address of next header block (0000h if last)
06h WORD segment address of previous header block (0000h if first)
08h WORD pointer to next TCB
0Ah WORD pointer to previous TCB
0Ch WORD pointer to associated TCB (if applicable)
0Eh WORD reserved
---BDB---
10h BYTE logical drive
11h BYTE unit passed to driver
12h WORD sector size
14h BYTE cluster mask
15h BYTE cluster shift count
16h WORD starting sector of first FAT
18h BYTE number of FATs
19h WORD number of root directories
1Bh WORD sector number of first data sector (cluster 0002h)
1Dh WORD number of clusters + 1 (number of highest data cluster)
1Fh BYTE number of sectors in FAT
20h WORD beginning root directory sector number
22h DWORD device driver address
26h BYTE media descriptor byte
27h 5 BYTEs ???
2Ch BYTE flag:
Format of PC-MOS/386 Record Lock Block:
Offset Size Description (Table 04014)
00h BYTE signature byte "H" if allocated from system memory pool
01h BYTE header block ID, "R" = record lock block
02h WORD length of block in paragraphs
04h WORD segment address of next header block (0000h if last)
06h WORD segment address of previous header block (0000h if first)
08h WORD pointer to next TCB
0Ah WORD pointer to previous TCB
0Ch WORD pointer to associated TCB (if applicable)
0Eh WORD reserved
---RLB---
10h WORD segment address of owner's PSP
12h WORD segment address of Global File Block (see #04011)
14h WORD segment address of owner's Task File Block (see #04009)
16h DWORD file offset of locked region start
1Ah DWORD length of locked region
1Eh WORD owner's handle for file
Category:
Other Operating Systems
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Int D4h
-
P
Nonzero if GFB refers to character device
46h WORD address of Block Device Block (see #04013)
48h WORD sector of file's directory entry (see #01352)
4Ah WORD high word of file's directory entry
4Ch WORD ofsset of directory entry within sector
Volume > 32MB
2Dh BYTE ???
2Eh BYTE number of sectors per cluster
2Fh WORD number of clusters on device
31h WORD number of free clusters (FFFFh = unknown)
33h WORD root directory cluster number
35h WORD pointer to alias/subst string
37h WORD TCB segment address of owner (0000h = none)
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