Compatibility: DPMI 0.9+
Expects: AX    0801H
BX:CX linear address obtained via INT 31H 0800H
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
                                                                  
Info: This frees resources consumed by a previous use of INT 31H 0800H
(physical address mapping).

See Also: DPMI API
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INT 31H 0801H: Free Physical Address Mapping