Think of a computer and your mind might conjure the brushed steel contours of the latest must-have laptop or, for those of a certain age, a room full of whirring cabinets and reel-to-reel tape decks. The era of electronic computing has its roots in the code-breaking exploits of Bletchley Park; but the need for repetitive and reliable number-crunching did not suddenly begin with the wartime threat of Nazi submarines.

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