In April 1964 IBM introduced the Model 360, the first computer that came in a variety of sizes and that was compatible with many different applications. Software and peripheral devices that worked on any one of the versions also worked on the others and were also “backward compatible” with earlier IBM models. Before, users had to start over with entirely new software, printers, and terminals and so on, whenever they switched to a larger computer or added a new application. The Model 360 and its successor, the Model 370, led the company to dominance of both U.S and international markets.
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