📄 interrupn.txt
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Offset Size Description (Table 03101)
00h BYTE flags
bit 7: process slot is valid
01h WORD offset into DESQVIEW.DVO of program's record if started from
Open Windows menu, else undefined
03h WORD Switch Windows window number
05h WORD segment of process handle
07h WORD number of tasks owned by process
09h WORD mapping context of process (see #00416 at INT 15/AX=1016h)
0Bh DWORD hook for other programs
Format of DVSIXDI v1.10-v2.00 information for one process:
Offset Size Description (Table 03102)
00h BYTE process flags (see #03103)
01h WORD Open Window keys
03h WORD Switch Windows number
05h WORD segment of process handle
07h WORD number of tasks for process
09h WORD process mapping context
0Bh DWORD time process started (relative to start of DESQview)
0Fh DWORD time process last got CPU (relative to start of DESQview)
13h DWORD time process last gave up CPU (relative to start of DESQview)
17h DWORD total CPU time since process started
1Bh DWORD CPU time at start of current instantaneous interval
1Fh DWORD CPU time in current instantaneous interval
23h DWORD hook for other programs
Note: all times are in 1/100s for v1.10, in 1/18s for v1.11+
Bitfields for DVSIXDI process flags:
Bit(s) Description (Table 03103)
7 valid record
6 (v2.00+) record is allocated; if bit 7 clear, process is "(starting)"
and only offsets 01h and 09h are valid
5 (v2.00+) this app currently owns the CPU
4 reserved (0)
3 DESQview system task
2 reserved (0)
1 task has keyboard (currently unused)
0 task swapped out (currently unused)
--------Q-2FDE01BXFFFE-----------------------
INT 2F U - DESQview v2.26+ XDI - DVXMS.DVR - ???
AX = DE01h
BX = FFFEh
CX = 4D47h ("MG")
DX = 0052h (0,"R")
Return: AL = FFh
DX = 584Dh
--------Q-2FDE02-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DV INITIALIZATION COMPLETE
AX = DE02h
BX = mapping context of DESQview
DX = handle of DESQview system task
Note: driver should pass this call to previous handler after doing its work
SeeAlso: AX=DE03h,AX=DE0Fh,INT 15/AX=5400h
--------Q-2FDE03-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DV TERMINATION
AX = DE03h
BX = mapping context of DESQview
DX = handle of DESQview system task
Notes: driver should pass this call to previous handler before doing its work
DESQview makes this call when it is exiting, but before unhooking any
interrupt vectors
SeeAlso: AX=DE02h,AX=DE0Fh,INT 15/AX=5407h
--------Q-2FDE04-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - ADD PROCESS
AX = DE04h
BX = mapping context of new process (see #00416 at INT 15/AX=1016h)
DX = handle of process
Return: nothing
Notes: XMS XDI handler (installed by default) allocates a 22-byte record
(see #03104) from "common" memory to control access to XMS memory
all DOS, BIOS, and DV API calls are valid in handler
driver should pass this call to previous handler after processing it
SeeAlso: AX=DE05h,AX=DE06h,INT 15/AX=5401h
Format of XMS XDI structure:
Offset Size Description (Table 03104)
00h DWORD pointer to 10-byte record???
04h DWORD pointer to next XMS XDI structure
08h WORD mapping context
0Ah BYTE ???
0Bh 5 BYTEs XMS entry point to return for INT 2F/AX=4310h"XMS"
(FAR jump to next field)
10h 6 BYTEs FAR handler for XMS driver entry point
(consists of a FAR CALL followed by RETF)
--------Q-2FDE05-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - REMOVE PROCESS
AX = DE05h
BX = mapping context of process (see #00416 at INT 15/AX=1016h)
DX = handle of last task in process
Return: nothing
Notes: XMS XDI handler releases the structure allocated by AX=DE04h
driver should pass this call to previous handler before processing it
all DOS, BIOS, and DV API calls except those generating a task switch
are valid in handler
SeeAlso: AX=DE04h,AX=DE07h,INT 15/AX=5402h
--------Q-2FDE06-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - CREATE TASK
AX = DE06h
BX = mapping context of process containing task
DX = handle of new task
Notes: driver should pass this call to previous handler after processing it
all DOS, BIOS, and DV API calls are valid in handler
--------Q-2FDE07-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - TERMINATE TASK
AX = DE07h
BX = mapping context of process containing task
DX = handle of task
Notes: driver should pass this call to previous handler before processing it
all DOS, BIOS, and DV API calls except those generating a task switch
are valid in handler
SeeAlso: AX=DE04h,AX=DE06h,AX=DE10h
--------Q-2FDE08-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SAVE STATE
AX = DE08h
BX = mapping context of task being switched from
(see #00416 at INT 15/AX=1016h)
DX = handle of task being switched from
Notes: invoked prior to task swap, interrupts, etc
driver should pass this call to previous handler after processing it
SeeAlso: AX=DE09h,INT 15/AX=5403h,INT 15/AX=DE27h
--------Q-2FDE09-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - RESTORE STATE
AX = DE09h
BX = mapping context of task being switched to
(see #00416 at INT 15/AX=1016h)
DX = handle of task being switched to
Notes: state is restored except for interrupts
driver should pass this call to previous handler before processing it
SeeAlso: AX=DE08h,INT 15/AX=5404h,INT 15/AX=DE27h
--------Q-2FDE0A-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - CHANGE KEYBOARD FOCUS
AX = DE0Ah
BX = mapping context of task receiving focus
DX = handle of running task
Notes: driver should pass this call to previous handler before processing it
this call often occurs inside a keyboard interrupt
DV 2.42 does not provide this call to XDI handlers running inside a
window; instead, it directly calls the INT 2F handler which was
active at the time DV started
SeeAlso: INT 15/AX=DE26h,INT 15/AX=DE2Fh
--------Q-2FDE0B-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DVP PROCESSING COMPLETE
AX = DE0Bh
BX = mapping context of DESQview system task
CX = number of system memory paragraphs required for the use of all
XDI drivers (DV will add this to system memory in DVP buffer)
DX = handle of DESQview system task
SI = mapping context of new process if it starts
ES:DI -> DVP buffer
Return: CX incremented as needed
Notes: once DV invokes this function, the DVP buffer contents may be changed
driver should pass this call to previous handler before processing it
--------Q-2FDE0C-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SWAP OUT PROCESS
AX = DE0Ch
BX = mapping context of task being swapped out
(see #00416 at INT 15/AX=1016h)
DX = handle of DESQview system task
Note: driver should pass this call to previous handler after processing it
--------Q-2FDE0D-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SWAP IN PROCESS
AX = DE0Dh
BX = mapping context of process just swapped in
(see #00416 at INT 15/AX=1016h)
DX = handle of DESQview system task
Note: driver should pass this call to previous handler before processing it
--------Q-2FDE0E-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DVP START FAILED
AX = DE0Eh
BX = mapping context of DESQview system task
DX = handle of DESQview system task
SI = mapping context of failed process (same as for call to AX=DE0Bh)
Note: driver should pass this call to previous handler after processing it
--------Q-2FDE0F-----------------------------
INT 2F C - DESQview v2.50+ External Dev Interface - INITIALIZE DV
AX = DE0Fh
Note: DESQview 2.50+ calls this function just before it completes its
initialization. At the time of the call, DESQview has not yet
changed any interrupt vectors
SeeAlso: AX=DE02h
--------Q-2FDE10-----------------------------
INT 2F C - DESQview v2.50+ External Dev Interface - FREE TASK
AX = DE10h
BX = mapping context of process (see #00416 at INT 15/AX=1016h)
DX = task handle of process
Note: DESQview 2.50+ calls this function before it frees the task; it is
similar to AX=DE07h but allows the XDI handler to make calls which
cause context switches
SeeAlso: AX=DE06h,AX=DE07h
--------c-2FDF00-----------------------------
INT 2F - HyperWare programs - INSTALLATION CHECK
AX = DF00h
BX = product code (see #03105)
CX = 0000h
DX = 0000h
Return: AL = status
00h not installed
FFh multiplex number in use
CX = 5948h ('YH') if selected product installed
---HyperDisk---
BX = code segment of resident portion
DX = HyperDisk local data version
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
Range: AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: INT 13/AX=8EEDh
Index: installation check;HyperDisk|installation check;HyperStb
Index: installation check;HyperKey|installation check;HyperScreen
Index: HyperDisk;installation check|HyperStb;installation check
Index: HyperKey;installation check|HyperScreen;installation check
(Table 03105)
Values for HyperWare product code:
4248h ('BH') HyperStb
4448h ('DH') HyperDisk v4.20+
4B48h ('KH') HyperKey
5348h ('SH') HyperScreen
--------Q-2FDF00BX5445-----------------------
INT 2F U - Quarterdeck TELTSR.COM - INSTALLATION CHECK
AX = DF00h
BX = 5445h ('TE')
CX = 4C54h ('LT')
DX = 5352h ('SR')
Return: BX = 5454h ('TT') if installed
CX = 494Eh ('IN') if installed
DX = 5454h ('ST') if installed
Program: TELTSR is a Telnet TSR included with Quarterdeck's DESQview/X v2.00
which provides an INT 14h interface to the network
Range: AH=DEh to AH=FFh and AH=C0h to AH=DDh, selected by scanning
SeeAlso: AX=DF01h"TELTSR",AX=DF02h"TELTSR",INT 14/AH=56h
--------N-2FDF01BX0000-----------------------
INT 2F U - MSG.COM - INSTALLATION CHECK
AX = DF01h
BX = 0000h
Return: AX = FDFFh if installed
BX = segment of resident code
Program: MSG.COM is a TSR for intercepting incoming Novell broadcast
messages written by Gary Dobbins (Dobbins@Arizona.Edu)
--------c-2FDF01BX4448-----------------------
INT 2F - HyperDisk v4.50+ - GET CURRENT CACHE STATE
AX = DF01h
BX = 4448h ('DH')
Return: AX = 0000h if function supported
BX = number of cache buffers in use
CX = number of cache buffers which have been modified
DL = caching flags (see #03106)
Range: AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: AX=DF00h,AX=DF02h
Bitfields for HyperDisk caching flags:
Bit(s) Description (Table 03106)
0 staged writes enabled for floppy disks
1 staged writes enabled for hard disks
2 writes verified on floppy disks
3 writes verified on hard disks
4 reserved (0)
5 reserved (0)
6 floppy caching enabled
7 all caching functions enabled
--------Q-2FDF01-----------------------------
INT 2F U - Quarterdeck TELTSR.COM - CLOSE CONNECTION
AX = DF01h
Return: nothing???
Note: invokes the DESQview/X socket API (see INT 15/AX=DE2Eh) function 0006h
to close the socket corresponding to the file handle set with
AX=DF02h; NOP if no file handle was ever set
SeeAlso: AX=DF00h"TELTSR",AX=DF02h"TELTSR"
--------c-2FDF02BX4448-----------------------
INT 2F - HyperDisk v4.50+ - SET CACHE STATE
AX = DF02h
BX = 4448h ('DH')
DL = new caching flags (see #03106)
Return: AX = 0000h if supported
BX = number of cache buffers in use
CX = number of cache buffers which have been modified
DL = previous caching flags (see #03106)
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
Range: AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: AX=DF00h,AX=DF01h
--------Q-2FDF02-----------------------------
INT 2F U - Quarterdeck TELTSR.COM - OPEN CONNECTION
AX = DF02h
BX = file handle for connection's socket
Return: AX = status
0000h successful
FFFFh no more room in TELTSR's JFT
Program: TELTSR is a Telnet TSR included with Quarterdeck's DESQview/X v2.00
Notes: the indicated file handle becomes owned by TELTSR, and is closed in
the caller's JFT
multiple calls to this function will override the previous assignment
without closing the previous file; use AX=DF01h before further calls
SeeAlso: AX=DF00h"TELTSR",AX=DF01h"TELTSR"
--------U-2FE000-----------------------------
INT 2F - SETDRVER.COM v2.10+ - INSTALLATION CHECK
AX = E000h
Return: AX = 4A52h ("JR") if present
Program: SETDRVER is a public domain TSR by Jacob Rieper which sets the
apparent DOS version analogously to MS-DOS SETVER
Notes: this installation check differs from the usual one of returning AL=FFh
the SETDRVER API is fully emulated by Matthias Paul's FREEVER
SeeAlso: AX=E000h/DX=4D50h,AX=E001h,INT 21/AH=52h
--------j-2FE000-----------------------------
INT 2F - KAOSHIDE - INSTALLATION CHECK
AX = E000h
Return: AL = FFh if installed
Program: KAOSHIDE ('Hidden Kaos') is a PD joke TSR which randomly capitalizes
alphabetic keys, written by Philip Maland. Although not a virus,
v2.0 uses some viral-like techniques to hide itself from
memory-reports by reducing DOS memory size.
--------U-2FE000DX4D50-----------------------
INT 2F - FREEVER v1.0+ - INSTALLATION CHECK
AX = E000h
DX = 4D50h ('MP')
Return: AL = FFh if installed
AH = AMIS INT 2Dh multiplex ID
CX = FREEVER version (CH=major, CL=minor)
DX:DI -> AMIS-compliant signature (see #02569)
(vendor ID is "M. Paul ", program name is "FREEVER ")
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
to SETVER for any DOS-compatible OS, written by Matthias Paul
Note: FREEVER emulates INT 21/AH=30h, INT 21/AX=3306h, INT 21/AX=4412h,
INT 21/AX=4452h, and SETDRVER's API on INT 2F/AX=E00xh, as well as
providing an AMIS API on INT 2Dh
SeeAlso: AX=E000h"SETDRVER",INT 21/AH=30h,INT 21/AX=3306h,INT 21/AX=4452h
--------K-2FE000DX5354-----------------------
INT 2F - StuffIt v3.21+ - INSTALLATION CHECK
AX = E000h
DX = 5354h ("ST")
Return: AL = FFh if installed
BX = version (BH = major, BL = BCD minor)
DX = segment of resident code
Program: StuffIt is a freeware delayed keyboard stuffer by Terje Mathisen
--------U-2FE001-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET SETDRVER VERSION
AX = E001h
Return: AH = major version
AL = minor version
Note: the SETDRVER API is fully emulated by Matthias Paul's FREEVER, which
returns version 2.10 for this call; use AX=E000h/DX=45D0h to get
FREEVER's version number
SeeAlso: AX=E000h,AX=E000h/DX=45D0h
--------U-2FE002-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET ORIGINAL DOS VERSION INFO
AX = E002h
Return: AL = FFh if successful
BH = major DOS version
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