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        Map/unmap multiple handle pages

        Entry:
          AH = 50h
          AL = subfunction
                 00h
                 01h
          DX = handle
          CX = number of entries in array
          DS:SI = pointer to mapping array
        Return:
          AH = status
            00h successful
            80h internal error
            81h hardware malfunction
            83h invalid handle
            84h undefined function requested
            8Ah one or more logical pages are invalid
            8Bh one or more physical pages are invalid
            8Fh invalid subfunction
See Also: Errors 

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