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IBM 7950 Harvest
The IBM 7950, also known as Harvest, was a one-of-a-kind adjunct to the Stretch computer which was installed at the United States National Security Agency (NSA). Built by IBM, it was delivered in 1962 and operated until 1976, when it was decommissioned. Harvest was designed to be used for cryptanalysis.
==Development==
In April 1958, the final design for the NSA-customized version of IBM's Stretch computer had been approved, and the machine was installed in February 1962.〔Bamford, 2001, p. 586〕 The design engineer was James H. Pomerene,〔J.A.N. Lee, March in computing history, looking.back, ''Computer'', 29(3), March 1996 ((online) )〕 and it was built by IBM in Poughkeepsie, New York. Its electronics (fabricated of the same kind of discrete transistors used for Stretch) were physically about twice as big as the Stretch to which it was attached. Harvest added a small number of instructions to Stretch, and could not operate independently.
An NSA-conducted evaluation found that Harvest was more powerful than the best commercially available machine by a factor of 50 to 200, depending on the task.〔Bamford, 2001, p. 587〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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