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IBM 700/7000 series
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<p>The IBM 700/7000 series is a series of large-scale (<a href="/facts/Mainframe_computer/nrBR6rWa">mainframe</a>) computer systems that were made by <a href="/facts/IBM/QszA7nwd">IBM</a> through the 1950s and early 1960s. The series includes several different, incompatible processor architectures. The 700s use <a href="/facts/Vacuum-tube/VHd1BNLq">vacuum-tube</a> logic and were made obsolete by the introduction of the <a href="/facts/Transistor_computer/4JXJWsaQ">transistorized</a> 7000s. The 7000s, in turn, were eventually replaced with <a href="/facts/IBM_System%2f360/7znvpy4K">System/360</a>, 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 <a href="/facts/OS%2f360/nQbdNbx6">OS/360</a> and the high cost of converting software kept many 7000s in service for years afterward. </p>