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INT 31 - DPMI 0.9 API - protected mode - ALLOCATE DOS MEMORY BLOCK
        AX = 0100h
        BX = number of paragraphs to allocate
Return: CF set on error
            AX = DOS error code (07h,08h) (see INT 21/AH=59h)
            BX = size (in paragraphs) of largest available block
        CF clear if successful
            AX = real mode segment of allocated block
            DX = first selector for allocated block
Notes:  multiple contiguous selectors are allocated for blocks of more than 64K
        never modify or deallocate returned descriptors
SeeAlso: AX=0101h,AX=0501h