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Int 31 Fn 0801  P - DPMI 1.0+ - Free Physical Address Mapping              [E]

   AX = 0801h
   BX:CX = linear address returned by AX=0800h

Return: CF clear if successful
   CF set on error
       AX = error code (8025h) (see AX=0000h)

Note:  should be called at end of access to device mapped with AX=0800h

See Also: AX=0508h,AX=0509h,AX=0800h,INT 21/AX=EB03h
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