From ACE to the G-15

The 1946 Turing proposal for a stored-program computer at Britain's National Physical Laboratory is briefly described. The author's participation in the Test Assembly design, NPL's design of the ACE Pilot Model, and the subsequent design of the ACE are presented. The author's return to the United States and his efforts to build a similar computer at the National Bureau of Standards are described. Finally, the design of the Bendix G-15 and how it is related to the other computers is discussed. These computers were characterized by having re-circulating memories and logical designs that permitted the execution of several instructions per memory cycle.