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Colossus If the question is referring to the first ELECTRONIC computer - Colossus was the first electronic computer developed by the British to crack the LORENZ codes used by the German high command. The existence of Colossus remained a secret long after WWII. Until recently ENIAC was thought to be the first, but the secrecy of Colossus was finally lifted and we find it (and 9 others) were first operational in Jan 1944 while various portions of ENIAC were made operational in the period of June 1944 through October 1945.

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17y ago

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