TRS-80 The TRS-80 Micro Computer System (TRS-80, later renamed 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, Z80 [microprocessor]. It is one of the earliest mass-produced and mass-marketed retail home computers. Tandy Corporation 1977 1977-08-03 August 3, 1977 Computer 3-4 5E6064 233D98 A8AAAE CE2027 0F7C3E Dator