types of computer casing

Abstract:
The portable computer has a computer casing provided with a rectangular receiving space accessible from one side thereof, and a socket connector projecting inwardly into the receiving space from an innermost end of the receiving space and being electrically connected to the internal circuitry confined by the computer casing. A detachable cartridge type interface device has a rectangular casing detachably provided in the receiving space of the computer casing, and an interface card confined inside the rectangular casing. The rectangular casing has a rear end provided with a rectangular opening to access one end of the interface card. The socket connector extends into the rectangular opening to engage the interface card so as to electrically connect the same to the internal circuitry. The front end of the rectangular casing is provided with a socket to permit electrical connection of the portable compute with an external device.