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INT 67h, 5Dh ENABLE/DISABLE OS FUNCTION SET FUNCTIONS . 4.0
On entry:
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
00h successful
80h internal error
81h hardware malfunction
84h undefined function requested
8Fh undefined subfunction
A4h operating system denied access
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