Yamauchi cut out all extraneous devices to save money, but he told the engineers to include, for a trivial added cost, circuitry and a connector that could send or receive an unmodified signal to the central processor. The connector could pave the way for expansion—the addition of anything from a modem to a keyboard. It was why the machine would later be called Yamauchi’s Trojan Horse: It slipped into living rooms with nothing but a pair of controllers, innocently toylike, yet it included the capability to do far more than play games.