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Colossus was the first electronic digital computer

Nature volume 441, page 25 (04 May 2006) | Download Citation

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Sir

Your timeline (“Milestones in scientific computing” Nature 440, 399–405; 200610.1038/440399a) starts in 1946 with ENIAC, “widely thought of as the first electronic digital computer”. But that title should arguably be held by the British special-purpose computer Colossus (1943), used during the Second World War in the secret code-breaking centre at Bletchley Park.

Modern computing history starts even earlier, in 1941, with the completion of the first working program-controlled computer Z3 by Konrad Zuse in Berlin. Zuse used electrical relays to implement switches, whereas Colossus and ENIAC used tubes. But the nature of the switches is not essential — today's machines use transistors, and the future may belong to optical or other types of switches.

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  1. Dalle Molle Institute for Artificial Intelligence, Galleria 2, 6928 Manno-Lugano, Switzerland, and Institut für Informatik, TUM, Boltzmannstraße 3, D-85748 Garching bei München, Germany

    • Jürgen Schmidhuber

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https://doi.org/10.1038/441025d

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