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, and that some of the construction was done by Steve Bristow, an intern at Ampex.
The final Computer Space design uses no microprocessor or memory; the entire computer system is a state machine made of 74-series TTL chips, with graphic elements held in diode arrays [REF].