IBM 405 Alphabetical Accounting Machine introduced
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1934 The IBM 405 Alphabetical Accounting Machine was launched in 1934. The IBM 405 was a combined adding, subtracting, and printing machine. It printed reports, consisting of both alphabetic and numerical information, from data on punched cards. The IBM 405, commonly known as the 405 tabulator, was IBM's flagship product until it was retired in May 1949. The machine was programmed using a plugboard, similar to a telephone switchboard. It could tabulate at a rate of 150 cards per minute, or tabulate and print at a rate of 80 cards per minute. During World War II, the IBM 405 formed part of a system developed by IBM for the US Army Signal Corps to decrypt coded messages. Related information:
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