A device for permitting the individual selection any one of a plurality of control cartridges of the type commonly used in conjunction with cartridge controlled apparatus such as a video computer system. A holder holds the cartridges in a plurality of separate storage trays. Switch means, which may be either mechanical or electrical, are actuatable by a user to electrically connect one of the cartridges stored in the holder to an output cable. The output cable, in turn, connects to an adapter that fits in the receptacle of the computer system where the cartridges are normally plugged individually and directly.
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