 That is plugged into the host adapter that handles the SASI signals and protocol with a controller that plugs directly into the 44-pin ROM cartridge expansion slot in the form of a physical edge connector that mates the controller board to the system bus of the host computer.The connection between the computer host adapter (DB-25F) and the hard drive unit consists of a cable with two DB-25 connectors.A key feature of the Lt. Kernal is its sophisticated disk operating system, which behaves much like that of the Point 4 minicomputers that Fiscal was reselling in the 1980s.