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As soon as we finished repairing a printer failure at the Computer History Museum, Murphy's law struck and the card reader started malfunctioning. The printer and card reader were attached to an IBM 1401, a business computer that was announced in 1959 and went on to become the best-selling computer of the mid-1960s. In that era, data records were punched onto 80-column punch cards and then loaded into the computer by the card reader, which read cards at the remarkable speed of 13 cards per secon...