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        Get mappable physical address array

        Entry:
          AH = 58h
          AL = subfunction
                00h get mappable physical address array
                    ES:DI = pointer to buffer to be filled with array
                01h get number of entries in m.p.a. array
        Return:
          CX = number of entries in array
          AH = status
            00h successful
            80h internal error
            81h hardware failure
            84h undefined function requested
            8Fh undefined subfunction