INT 67 - LIM EMS 4.0 - MOVE/EXCHANGE MEMORY REGION
        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

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