Int E0  R - Real/32 - "mp_map" - Map Physical Memory                       [O]

   CL = B5h
   DS:DX -> Memory Physical Parameter Block (see #3783)

Return: AX = status (0000h successful, FFFFh error)
   may destroy SI,DI,DS

See Also: INT E0/CL=B3h

Format of REAL/32 Memory Physical Parameter Block:
Offset Size    Description (Table 3783)
 00h   WORD    4K page number in first megabyte to be mapped
 02h   WORD    number of page to map into above page, or 0000h to unmap
 04h   WORD    window number (0000h, as only one window currently supported)
 06h   WORD    reserved

Note:  all users of the system share the window, so applications should not
     use it for arguments to system calls, attempt to read/write to/from
     files via the window, etc.