Jobs co-founded Apple in 1976 to sell Wozniak's Apple I personal computer. The duo gained fame and wealth a year later for the Apple II, one of the first highly successful mass-produced personal computers. In 1979, after a tour of Xerox PARC, Jobs saw the commercial potential of the Xerox Alto, which was mouse-driven and had a graphical user interface (GUI). This led to development of the failed Apple Lisa in 1983, followed by the successful