INT 31H 0801H: Free Physical Address Mapping

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

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions
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