Int 67 Fn 57  - LIM EMS 4.0 - Move/exchange Memory Region                  [m]

   AH = 57h
   AL = subfunction
       00h move memory region
       01h exchange memory region
   DS:SI -> structure describing source and destination (see below)

Return: AH = status (see below)

Note:  source and destination may overlap for a move, in which case the copy
     direction is chosen such that the destination receives an intact copy
     of the source region

Values for status:
 00h   successful
 80h   internal error
 81h   hardware failure
 83h   invalid handle
 84h   undefined function requested
 8Ah   invalid logical page number encountered
 8Fh   undefined subfunction
 92h   successful, but a portion of the source region has been overwritten
 93h   length of source or destination region exceeds length of region
     allocated to either source or destination handle
 94h   conventional and expanded memory regions overlap
 95h   offset within logical page exceeds size of logical page
 96h   region length exceeds 1M
 97h   source and destination EMS regions have same handle and overlap
 98h   memory source or destination type undefined
 A2h   attempted to wrap around 1M conventional address space

Format of EMS copy data:
Offset Size    Description
 00h   DWORD   region length in bytes
 04h   BYTE    source memory type
       00h conventional
       01h expanded
 05h   WORD    source handle (0000h if conventional memory)
 07h   WORD    source initial offset (within page if EMS, segment if convent)
 09h   WORD    source initial segment (conv mem) or logical page (EMS)
 0Bh   BYTE    destination memory type
       00h conventional
       01h expanded
 0Ch   WORD    destination handle
 0Eh   WORD    destination initial offset
 10h   WORD    destination initial segment or page