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  1. John Vincent Atanasoff and his assistant Clifford Berry built ABC, the first electronic digital computer (a special purpose machine that was not programmable) from 1936 to 1942. The local newspaper in Ames, Iowa where it was built published an article on it in 1941.
  2. Tommy Flowers and a team in the British Post Office built Colossus, the first programmable electronic digital computer from late 1943 to June 5, 1944 to break the Nazi high command's cyphers, just in time for D-day. Before the end of the war a total of 10 Colossus computers were built in 2 different models. Colossus remained classified until after 1980, so it does not appear in most computer histories.
  3. J. Presper Eckert, John Mauchly, and a team of several hundred engineers, technicians, and assemblers built the ENIAC, the first general purpose programmable electronic digital computer from 1943 to November 1945. Its first real program took 2 months to run (December 1945 to January 1946) and simulated Edward Teller's first hydrogen bomb design (proving it unworkable). ENIAC was declassified and announced to the public in February 1946 (the first computer to receive nationwide publicity).
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9y ago

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