NAME
        IND_SETMTYPE -- Set the current mouse port controller type

   FUNCTION
        This command sets the type of device at the mouse port, so
        the signals at the port may be properly interpreted.

   IO REQUEST
        io_Message      mn_ReplyPort set if quick I/O is not possible
        io_Device       preset by the call to opendevice
        io_Unit         preset by the call to opendevice
        io_Command      IND_SETMTYPE
        io_Flags        IOB_QUICK set if quick I/O is possible
        io_Length       1
        io_Data         the address of the byte variable describing
                        the controller type, as per the equates in
                        the gameport include file