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AH = 5Dh AL = subfunction 00h enable OS Function Set 01h disable OS Function Set 02h return access key (resets memory manager, returns access key at next invocation) BX,CX = access key returned by first invocation
Return:
BX,CX = access key, returned only on first invocation of function AH = status (see also AH=5Ch) 8Fh undefined subfunction A4h operating system denied access
Category: Memory Management - Int 67h - L
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