Int 21/AH=20h

S/DOS 1.0+ & PTS-DOS 6.51+ - GET OEM REVISION

AH = 20h
AL = which OEM code to retrieve
00h get PTS OEM code
Return:
CF cleared
AL = OEM code (currently always 00h)
01h get PTS OEM revision code
Return:
CF cleared
AL = revision code (default is 00h, but may vary)

Desc: S/DOS is a reduced and modified PTS-DOS 6.51 release with source code on CD

Note: This function is provided by S/DOS 1.0 (and is most probably also supported with PTS-DOS 6.51+, maybe even earlier). It clears the CF flag for all other AL arguments, too. However, AL = 00h and 01h are handled separately. The revision code can be individually defined in the MAKEFILE at compilation time.. The PTS OEM code does not correlate with the DOS OEM code returned by INT 21/AH=30h, likewise the PTS OEM revision does not correlate with the DOS revision returned by INT 21/AX=3306h.

See Also: INT 21/AH=30h - INT 21/AX=3306h

Category: Other Operating Systems - Int 21h - S

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