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The IBM 7700 Data Acquisition System was announced by IBM on December 2, 1963.〔(IBM history page listing the IBM 7700 and its replacement, the IBM 1800 )〕 It was capable of collecting data from as many as 32 sources simultaneously, process the data and transmit results to up to 16 remote printers, display units or plot boards. The IBM 7700 was short-lived, being replaced by the IBM 1800 Data Acquisition and Control System on November 30, 1964. Two IBM 7700 Data Acquisition Systems are known to have existed: one at the University of Rochester〔(Eric Anderson's autobiography, in which he mentions that he programmed the IBM 7700 at the University of Rochester )〕〔(Eric Anderson's résumé )〕 and the other at Stanford University.〔(Description of Stanford computers from 1953 to 1980 )〕〔(A paper from the High Energy Physics Lab at Stanford referencing their IBM 7700 )〕 Both were donated by IBM. The IBM 7700 was an 18-bit system, with instructions occupying two 18-bit words. Arithmetic instructions generally executed in two or three machine cycles, except for multiply, about 8 cycles, and divide, 12 cycles. A machine cycle was two microseconds. Address space was 262,144 words, but the two machines known to have been built had 16,384, 32,768 or 49,152 words. The IBM 7700 was contemporary with the IBM 7000 series but not considered a member of it. ==Notes== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IBM 7700 Data Acquisition System」の詳細全文を読む スポンサード リンク
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