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The pages on this site contain documentation for very old MS-DOS software,
purely for historical purposes.
If you're looking for up-to-date documentation, particularly for programming,
you should not rely on the information found here, as it will be woefully
out of date.
GetVer
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;* GetVer - Gets DOS version.
;*
;* Shows: DOS Function - 30h (Get MS-DOS Version Number)
;*
;* Params: None
;*
;* Return: Short integer of form (M*100)+m, where M is major
;* version number and m is minor version, or 0 if
;* DOS version earlier than 2.0
GetVer PROC
mov ah, 30h ; DOS Function 30h
int 21h ; Get MS-DOS Version Number
cmp al, 0 ; DOS version 2.0 or later?
jne @F ; Yes? Continue
sub ax, ax ; No? Set AX = 0
jmp SHORT exit ; and exit
@@: sub ch, ch ; Zero CH and move minor
mov cl, ah ; version number into CX
mov bl, 100
mul bl ; Multiply major by 10
add ax, cx ; Add minor to major*10
exit: ret ; Return result in AX
GetVer ENDP
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