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| | History of computing hardware - WebArticles.com |
 | | Nomograms, like this Smith chart serve as analog computers for specific classes of problems.Before World War II, mechanical and electrical analog computers were considered the 'state of the art', and many thought they were the future of computing. |
 | | Electronic computers became possible with the advent of the vacuum tube.The era of modern computing began with a flurry of development before and during World War II, as electronic circuits, relays, capacitors and vacuum tubes replaced mechanical equivalents and digital calculations replaced analog calculations. |
 | | This type of hardware limitation was to dominate programming for decades afterward, until the evolution of a programming model which was more sympathetic to software development.) By contrast, the transistorized IBM 1620, which replaced the 650, was the size of an office desk. |
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