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        Alter page map and jump

        Entry:
          AH = 55h
          AL = subfunction
                00h physical page numbers provided by caller
                01h segment addresses provided by caller
          DX = handle
          DS:SI = pointer to structure containing map and jump address
        Return: (at target address unless error)
          AH = status
            00h successful
            80h internal error
            81h hardware failure
            83h invalid handle
            84h undefined function requested
            8Ah invalid logical page number encountered
            8Bh invalid physical page number encountered
            8Fh invalid subfunction