Int 21/AH=FFh

Rational Systems DOS/4GW - API

AH = FFh
DH = function (00h-17h) (also see separate entries below)
DL = subfunction or argument

Return:
CF clear if valid function number
AX = status???
CF set if invalid function

See Also: INT 15/AX=BFDCh

Category: DOS Extenders - Int 21h - R

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