Once he moved to Nutting, Bushnell took over the majority of the engineering work for the game; Dabney has stated that he advised Bushnell on some of the design. After Dabney joined Bushnell at Nutting, he helped with the creation of the cabinet itself, including the coin slot, control panel, and power supply, and designed a sound system that could make a noise like a rocket engine. By August 1971, an initial prototype of the game—now named "Computer Space" to be similar to "Computer Quiz"—was complete, and Syzygy moved on to location testing. They installed the game at the Dutch Goose bar near Stanford University, where it met with great success. Nutting was heartened by the response and rushed to make several finished cabinets for the Music Operators of America (MOA) Music & Amusement Machines Exposition in October. Further location tests found a less enthusiastic response from customers confused by the game mechanics and controls, and Syzygy hurriedly adjusted the game's instructions to try to be more understandable to players.