On August 3, 1977, Tandy announced its TRS-80 Model 1 PC via its Radio Shack stores, which helped to begin the personal computer technology revolution. Tandy later lost ground to other PC makers.
Trs-80 RSS
Released before Microsoft Flight Simulator, Microsoft Adventure was a version of a mainframe PC game that the company first released in 1979 for the TRS-80, and was ported to the IBM PC in 1981