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Communications of the ACM

Historical reflections

Alan Turing's Other Universal Machine


Jim Wilkinson and Donald Davies with the Pilot ACE

Jim Wilkinson (left) and Donald Davies (right) with the Pilot ACE, May 1950.

Credit: Archive for the History of Computing, Manchester University

All computer scientists know about the Universal Turing Machine, one of the foundation stones of theoretical computer science. Much less well known is the practical stored program computer Turing proposed after the war in February 1946.

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