Printer and detachable device for setting functions of the printer

The combination of a printer and a function selector device for selecting and varying functions of said printer and detachably mountable on said printer, said printer having stored therein information relating to a plurality of line feed modes, carriage-return modes, and a plurality of internally stored selectable character fonts, said function selector device comprising a casing having an outer surface, a plurality of switch means having manually manipulatable operating knobs mounted on said surface of said casing and operable when installed in said printer to execute changing of a plurality of mechanical and electrical multi-choice printer functions including selecting of one of said line feed modes, one of said carriage-return modes, and one of said internally stored selectable character fonts, a circuit board disposed in said casing and connected to said switch means, and casing interconnect means on said casing connected to said circuit board, said printer having printer interconnect means, said casing interconnect means being operable to be mechanically and electrically connected to said printer interconnect means, said switch means being operable to be manually manipulated to effect setting of said multi-choice printer functions while said function selector device is detached from said printer.