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IBM Personal Computer/AT
The IBM Personal Computer/AT, more commonly known as the IBM AT and also sometimes called the PC AT or PC/AT, was IBM's second-generation PC, designed around the Intel 80286 microprocessor running at 6 MHz and released in 1984 as model number 5170. Because the AT used various technologies that were rare at the time in personal computers, the name AT originally stood for Advanced Technology, and indeed, the Intel 80286 processor used in the AT supported Protected mode.
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