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Project PX
Work on the project, codenamed Project PX, began towards the end of May 1943. Brainerd took on the role of project supervisor and Eckert was appointed as Chief Engineer. However, Mauchly’s teaching duties meant that he was only able to contribute to the project in an advisory capacity. The other members of the project team included Mauchly’s fellow student on the summer 1941 electronics course, Arthur Burks, plus recent engineering graduates T Kite Sharpless and Robert F Shaw. Joseph Chedaker, who had worked in manufacturing industry before joining the Moore School, was responsible for construction. The team gradually increased in size as other Faculty staff became available and were assigned to the project, eventually numbering approximately 50 people, of which 12 were engineers.
The architectural design of ENIAC was based on the use of multiple decimal accumulators, echoing that of the Harvard Mark I. However, in ENIAC the electromechanical counter wheels were replaced with electronic ring counters. Initial experimentation showed that flip-flops were more capable of operating at higher pulse rates than Thyratron valves so the ring counters were implemented using a set of ten flip-flops plus a carry mechanism which sent a carry pulse to the ring counter representing the next highest digit upon completion of a full cycle. Each accumulator contained ten ring counters, giving a word length of 10 decimal digits, along with an additional circuit for the algebraic sign.
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