Also early in his career Silverberg worked in the early 1980s at Apple Computer on the failed Lisa project.
By the fall, Apple had introduced versions 2.0 & 3.0 which allowed MacWorks to run from the Lisa's internal Widget or attached ProFile hard disk.
He was responsible for the decision to use the Motorola MC68000 family of microprocessors for Apple's Lisa and Macintosh computers and was instrumental in the initial design of the Lisa.
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In 1981, Capps started working for Apple on the Lisa project and he continued his work on the Macintosh, principally writing the Finder (along with Bruce Horn) and Macintosh system utilities—such as ResEdit.
In July 1981 Xerox announced the Xerox Star workstation, and by that point it was a well known "secret" that Apple Computer was working on a low-cost version that would later be known as the Lisa.