Int 21/AX=4B05h

DOS 5+ - SET EXECUTION STATE

AX = 4B05h
DS:DX -> execution state structure (see #01625)

Return:
CF clear if successful
AX = 0000h
CF set on error
AX = error code (see #01680 at AH=59h/BX=0000h)

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 (Table 01625) 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

Category: DOS Kernel - Int 21h - D

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