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IBM 701
("Defense Calculator") The first of the IBM 700 series of computers.
The IBM 701 was annouced internally on 1952-04-29 as "the most advanced, most flexible high-speed computer in the world". Known as the Defense Calculator while in development at {IBM Poughkeepsie Laboratory}, it went public on 1953-04-07 as the "IBM 701 Electronic Data Processing Machines" (plural because it consisted of eleven connected units).
The 701 was the first IBM large-scale electronic computer manufactured in quantity and their first commercial {scientific computer}. It was the first IBM machine in which programs were stored in an internal, addressable, electronic memory. It was developed and produced in less than two years from "first pencil on paper" to installation. It was key to IBM's transition from punched card machines to electronic computers.
It consisted of four {magnetic tape drives}, a {magnetic drum} memory unit, a {cathode-ray tube storage unit}, an L-shaped {arithmetic and control un
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