SCSI-II controller designed for use with the MTec 1230/28RTC A1200 accelerator. This card might also work with the MTec 1220, but this is unconfirmed. The main card itself has an internal 50pin SCSI connector, whilst an external connector is attached to the board via ribbon cable and presumably sits at the back of the A1200 where the blanking plate is. This card supports autobooting (mtecscsi.device).
Thanks to Jan Dwornizky