Apple Lisa Personal Computer System, 1984.

UNITED STATES - MARCH 09: Apple�s Lisa was the first computer to use a Graphical User Interface (GUI). Incorporating the powerful Motorola 68000 processor, and a mouse and pull-down menus, Lisa was intended by Apple�s founder, Steve Jobs, to set the technological standard and become the market leader in personal computers. Unfortunately, at just under $10,000 when launched in 1983, the price was too high for most potential buyers, but the innovations of the Lisa led directly to Apple�s successful Macintosh. (Photo by SSPL/Getty Images)