Int 21/AH=FFh/DH=0Ch

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Rational Systems DOS/4GW - GET/SET ???

AH = FFh
DH = 0Ch
DL = ??? (00h or 01h)

Return:
CF clear if successful AL = previous value of ??? CF set on error (DL out of range) AX = FFFFh

Category: DOS Extenders - Int 21h - R

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