Defense Calculator

Defense Calculator

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1952 The industry's first tape drive arrives, the IBM 726 Tape Unit for the IBM 701 Defense Calculator. The 701 cost over $1 million, used magnetic core memory that was priced at $1 Per bit, and had to be refrigerated.
Most of the study is organized topically, with individual chapters on magnetic tape, ferrite-core memories, disk storage, programming, and transistors, By far the strongest and most interesting chapters, however, are those focusing on particular machines, such as the Selective Sequence Electronic Calculator of the late 1940s, the Defense Calculator of 1950-51, and the IBM 700 series of computers of the mid-1950s.

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