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PERQ

Experimental Workstation

The PERQ, also referred to as the Three Rivers PERQ or ICL PERQ, is a pioneering workstation computer produced from the late 1970s through the early 1980s and the first commercially produced personal workstation with a graphical user interface. Its design was heavily influenced by the Xerox Alto, which was never commercially produced, and it was conceived by six former Carnegie Mellon University alumni and employees who formed the startup Three Rivers Computer Corporation in 1974.

Facts
Significance
It is the first commercially produced personal workstation with a graphical user interface. 1
Sources
1. Wikipedia: PERQ
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It is the first commercially produced personal workstation with a graphical user interface (GUI).
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