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INT 31 - DPMI 0.9 API - protected mode - GET DPMI VERSION
        AX = 0400h
Return: CF clear
        AH = major version
        AL = minor version
        BX = flags
            bit 0: running under an 80386 implementation
            bit 1: processor returns to real mode for reflected interrupts
                   instead of V86 mode
            bit 2: virtual memory supported
            bit 3: reserved (undefined)
            others reserved (zero)
        CL = processor type (02h=80286, 03h=80386, 04h=80486)
        DH = curr value of virtual master interrupt controller base interrupt
        DL = curr value of virtual slave interrupt controller base interrupt