Int 21/AH=FFh/DH=00h

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

AH = FFh
DH = 00h
DL = ??? (78h seen)

Return:
CF clear EAX = 4734FFFFh (high word is byte-swapped "4G") if DOS/4G installed

Note: Quarterdeck's DESQview/X X Toolkit library uses this call to determine whether the direct-mapped linear 4GB segment's selector is 34h or 38h

See Also: INT 21/AH=FFh/DH=00h"DOS/4GW"

Category: DOS Extenders - Int 21h - R

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