INT 31 P - DPMI 1.0+ - GET PAGE ATTRIBUTES
        AX = 0506h
        ESI = memory block handle
        EBX = offset in memory block of first page
        ECX = number of pages
        ES:EDX -> array of WORDs to hold page attributes (see below)
Return: CF clear if successful
            buffer filled
        CF set on error
            AX = error code (8001h,8023h,8025h) (see AX=0000h)
Notes:  only supported by 32-bit DPMI hosts, but may be used by 16-bit clients
        if EBX is not page-aligned, it will be rounded down
SeeAlso: AX=0507h,INT 21/AX=251Dh,INT 21/AX=EB00h

Format of page attribute words:
 bits 0-2       page type
                000 uncommitted
                001 committed
                010 mapped (see AX=0508h,AX=0509h)
                other currently unused
 bit 3          page is read/write rather than read-only
 bit 4          accessed/dirty bits supplied in bits 5 and 6
 bit 5          page has been accessed (only valid if bit 4 set)
 bit 6          page has been written (only valid if bit 4 set)
 bits 7-15      reserved (0)