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INT 31 - DPMI 0.9 API - protected mode - ALLOCATE MEMORY BLOCK
        AX = 0501h
        BX:CX = size in bytes
Return: CF set on error
        CF clear if successful
            BX:CX = linear address of block
            SI:DI = memory block handle
Notes:  no selectors are allocated
        the memory block is allocated unlocked
        allocations are often page granular
SeeAlso: AX=0000h, AX=0100h, AX=0500h, AX=0502h, AX=0503h