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The IBM 700/7000 series is a series of large-scale (mainframe) computer systems that were made by IBM through the 1950s and early 1960s. The series includes several different, incompatible processor architectures. The 700s use vacuum tube logic and were made obsolete by the introduction of the transistorized 7000s. The 7000s, in turn, were eventually replaced by System/360, which was announced in 1964. However the 360/65, the first 360 powerful enough to replace 7000s, did not become available until November 1965. Early problems with OS/360 and the high cost of converting software kept many 7000s in service for years afterward. ==Architectures== The IBM 700/7000 series has six completely different ways of storing data and instructions: *First (36/18-bit words): 701 (Defense Calculator) *Scientific (36-bit words): 704, 709, 7090, 7094, 7040, 7044 *Commercial (variable length character strings): 702, 705, 7080 *1400 series (variable length character strings): 7010 *Decimal (10 digit words): 7070, 7072, 7074 *Supercomputer (64-bit words): 7030 "Stretch" The 700 class used vacuum tubes, the 7000 class was transistorized. All machines (like most other computers of the time) use magnetic core memory; except for early 701 and 702 models, which use CRT memory. 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 700/7000 series」の詳細全文を読む スポンサード リンク
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