The Xerox Alto: Conceptually, the First Personal Computer System

In March 1973 the Alto computer system was operational at Xerox PARC. Conceptually the first personal computer system, the Alto eventually featured the first WYSYWG (What You See is What You Get) editor, a graphic user interface (GUI), networking through Ethernet, and a mouse. The Alto, which was conceptually a full ten years ahead of mass-market GUI machines, was priced $32,000.