The IBM 700/7000 series was a series of large-scale (mainframe) computer systems made by IBM through the 1950s and early 1960s. The series included several different, incompatible processor architectures. The 700s used 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.
Read more about IBM 700/7000 Series: Architectures, First Architecture (701), Scientific Architecture (704/709/7090/7094), Commercial Architecture (702/705/7080), 1400 Series Architecture (7010), Decimal Architecture (7070/7072/7074), Timeline, Performance
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