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AX = 0900h
Return:
CF clear virtual interrupts disabled AL = previous interrupt state (00h disabled, 01h enabled) AH preserved
Notes: The previous state may be restored simply by executing another INT 31. A CLI instruction may be used if the previous state is unimportant, but should be assumed to be very slow due to trapping by the host
Category: DOS Extenders - Int 31h - D
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