“The TRS-80 Model I took the world by storm. It had a 70% market share the year it launched, and they sold 100,000 machines in 1978, far outstripping its rivals. Yet by the early 1980s Radio Shack’s line of home computers was becoming irrelevant. How did a company that hadn’t even looked at a computer a year before it launched the TRS-80 create something so highly effective on their first try, and how did it become out of date so quickly?”
Go to Hacky Shack? The TRS-80 Model 1 Story for the description
Go to TRS-80 – Wikipedia, and List of TRS-80 and Tandy-branded computers – Wikipedia to get more info on the TRS 80.