Wikipedia
The TRS-80 Micro Computer System (TRS-80; later known as the Model I to distinguish it from successors) is a desktop microcomputer launched in 1977 and sold by Tandy Corporation through their Radio Shack stores. The name is an abbreviation of Tandy/Radio Shack, Z-80 microprocessor. It was one of the earliest mass-produced personal computers.
By 1979, the TRS-80 had the largest selection of software in the microcomputer market. Until 1982, the TRS-80 was the best-selling PC line, outselling the Apple II series by a factor of 5 according to one analysis.
In mid-1980, the broadly compatible TRS-80 Model III was released. The Model I was discontinued shortly after, primarily due to stricter FCC regulations on the radio-frequency interference it caused in surrounding electronics. In 1983, the Model III was in turn succeeded by the compatible Model 4.
As well as the original Model I and its compatible descendants, the TRS-80 name was later used as a generic brand on other technically unrelated computer lines sold by Tandy, such as the TRS-80 Model II, TRS-80 Color Computer and TRS-80 Pocket Computer.
TRS-80 is an electronic music group formed in Chicago in 1997 and led by founding member, Jay Rajeck.
TRS-80 is the name of Tandy Corporation's original 1977 microcomputer system (also known as the Model I). The TRS-80 brand was also later applied to many different computers sold by Tandy, including several unrelated in design to the Model I.