Before the advent of personal computers such as the Apple II in 1977 and the IBM Personal Computer (IBM PC) in 1981, the computer market was dominated by costly mainframes and minicomputers equipped with dumb terminals that time-shared processing time of the central computer. Through the 1970s, Xerox showed no interest in the work done at PARC. When Xerox finally entered the PC market with the Xerox 820 , they pointedly rejected the Alto design and opted instead for a very conventional model, a CP/M -based machine with the then-standard 80 by 24 character-only monitor and no mouse.
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