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Int 21 Fn 4B05 - DOS 5+ - Set Execution State [D]
AX = 4B05h
DS:DX -> execution state structure (see below)
Return: CF clear if successful
AX = 0000h
CF set on error
AX = error code (see AH=59h)
Note: used by programs which intercept AX=4B00h to prepare new programs for
execution (including setting the DOS version number). No DOS, BIOS
or other software interrupt may be called after return from this call
before commencement of the child process. If DOS is running in the
HMA, A20 is turned off on return from this call.
See Also: AH=4Bh
Format of execution state structure:
Offset Size Description
00h WORD reserved (00h)
02h WORD type flags
bit 0: program is an .EXE
bit 1: program is an overlay
04h DWORD pointer to ASCIZ name of program file
08h WORD PSP segment of new program
0Ah DWORD starting CS:IP of new program
0Eh DWORD program size including PSP
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