Click above to get retro games delivered to your door ever month!

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
            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
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

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