Peripheral with expansion connector attachable to host

A peripheral provided with expansion connector attachable to a host and contains an interface connector (or a plug-socket unit) P1 to be connected to an interface connector (or a plug-socket unit) P0 from the host, a subsidiary I/O interface connector (or plug-socket unit) P2;

• a dedicated interface circuit C100 and an selection switch SL100 to conduct through said interface connector (or plug-socket unit) P1 either to said dedicated interface circuit C100 or the subsidiary I/O interface connector (or the plug-socket unit) P2, essentially comprised of:
• a housing HS100, made of plastic by molding injection, or cast alloy or metallic material or other materials to accommodate the dedicated circuit C100, the interface connector (or the plug-socket unit) P1, one or more than one set of subsidiary I/O interface connector (or the plug-socket unit) P2, and the selection switch SL100 for the interface connector (or the plug-socket unit) P1 to select to connect through the dedicated circuit C100, the interface connector (or the plug-socket unit) P1, or to the subsidiary I/O interface connector (or the plug-socket unit) P2;
• and a tennon, screw or magnet structure for the peripheral to be incorporated to the host;
• an interface connector (or the plug-socket unit) P1, comprised of one that meets the specification of SERIAL, PS2, USB, IEEE1394 or other selected specification for connection to the interface connector (or the plug-socket unit) P0 from the host;
• a dedicated interface C100, solid-state electronic circuit or electromechanical circuit such as a receiving circuit functioning as a receiver or other interface circuit dedicated to the peripheral, depending on the properties of the selected interface device;
• a subsidiary I/O interface connector (or the plug-socket unit) P2, relates to one or more than one set of connector meeting SERIAL, PS2, USB, IEEE1394 or other selected specifications to connect to other wired peripheral;
• and
• a selection switch SL100, relates a distributed type of selection switch comprised of electromechanical or solid-state circuit device to switch the interface connector (or the plug-socket) P1 to connect to the dedicated interface circuit C100 or to the subsidiary I/O interface connector (or the plug-socket unit) P2. Depending on the transmission nature of the type of the interface circuit, such as SERIAL, PS2, USB, IEEE1394 or other type selected, the selection switch SL100 may be or may not be provided.