INT 67 - LIM EMS 4.0 - GET MAPPABLE PHYSICAL ADDRESS ARRAY
        AH = 58h
        AL = subfunction
            00h get mappable physical address array
                ES:DI -> 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
Note:   the returned array for subfunction 00h is filled in physical segment
          address order

Format of mappable physical address entry:
Offset  Size    Description
 00h    WORD    physical page segment
 02h    WORD    physical page number