Claim: Steve Jobs worked on the Apple Lisa.

Apple Lisa is a desktop computer developed by Apple , released on January 19 , 1983 . It was one of the first personal computers to offer a graphical user interface -LRB- GUI -RRB- in a machine aimed at individual business users . Development of the Lisa began in 1978 , and it underwent many changes during the development period before shipping at the very high price of US$ 9,995 with a 5 MB hard drive . The high price , relatively low performance and unreliable `` Twiggy '' floppy disks led to poor sales , with only 100,000 units sold .   In 1982 , after Steve Jobs was forced out of the Lisa project , he joined the Macintosh project , at that time developing a much more limited machine with a task-switching interface . Jobs redirected the Macintosh team to build a cheaper and better Lisa , releasing it in January 1984 and quickly outstripping Lisa sales . Newer versions of the Lisa were introduced that addressed its faults and lowered its price considerably , but it failed to achieve favorable sales compared to the much less expensive Mac . The final revision of the Lisa , the Lisa 2/10 , was modified and sold as the Macintosh XL .   Generally considered a failure , the Lisa nevertheless introduced a number of advanced features that would not re-appear on the Macintosh for a number of years . Among these was an operating system which featured protected memory and preemptive multitasking , and a more document-oriented workflow . The hardware itself was also much more advanced than the Macintosh , with a hard drive and support for up to 2 megabytes -LRB- MB -RRB- of RAM , expansion slots and a larger higher-resolution display . The main exception being that while the Macintosh also used the 68000 processor , the Macintosh initially used a version clocked at 7.89 Mhz , compared to the 5Mhz version used in the Lisa . The complexity of the Lisa operating system and its associated programs overtaxed the slower processor enough that users perceived it to be sluggish , particularly when scrolling in documents .