 During a visit by Prince Philip, Duke of Edinburgh in November 1957, they set up a system with an automotive headlamp connected to a handle that could be steered to move by hand, while the computer attempted to move its own headlamp to lay on the same spot on the wall.Ferranti continued development of the system and during the next year they completed a prototype of a commercial product which they showed publicly for the first time at the Olympia in November 1958.This machine used new circuitry that ran at the much faster rate of 500 kHz.