Int 2F Fn 122F U - DOS 4.x Internal - Set Dos Version Number To Return [D]
AX = 122Fh
DX = DOS version number (0000h = return true DOS version)
Note: not available under DR-DOS 5.0 or 6.0
See Also: INT 21/AH=30h,INT 21/AX=3306h
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