X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 31 - dpmi 0.9 api - protected mode

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INT 31 - DPMI 0.9 API - protected mode - GET AND DISABLE VIRTUAL INTERRPT STATE
        AX = 0900h
Return: CF clear
        virtual interrupts disabled
        AL = 00h if previously disabled
           = 01h if previously enabled
        AH preserved
Note:   the previous state may be restored simply by executing an INT 31
SeeAlso: AX=0901h,AX=0902h

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