Compatibility: DPMI 0.9+
Expects: AX    0501H
BX:CX size of block, in bytes (must not be 0)
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
BX:CX linear address of allocated block
SI:DI handle used to resize and free this block
                                                                  
Info: Allocates and commits a block of linear memory.

You must allocate and initialize descriptors (e.g., INT 31H 0000H
and INT 31H 0007H) in order to access this memory.

See Also: DPMI API
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INT 31H 0501H: Allocate Memory Block