Electronic processing system

摘要

A personal computer has a casing that includes a rear wall formed having an aperture, and a first expansion connector is located in the casing so as to face the aperture. A connector cover for opening and closing the aperture is swingably provided on the rear wall of the casing. An expansion adapter to which the computer is connected includes a carrying surface, on which the casing is detachably mounted, and a first relay connector located adjacent to the carrying surface and connectable with the first expansion connector. Provided on the carrying surface is a pushing projection that engages the connector cover, thereby causing it to swing to an open position, when the casing placed on the carrying surface is moved toward the first relay connector.