The broadly compatible TRS-80 Model III was released in the middle of 1980. Until 1982, the TRS-80 was the bestselling PC line, outselling the Apple II series by a factor of five according to one analysis. Tandy/Radio Shack provided full-service support including upgrade, repair, and training services in their thousands of stores worldwide.īy 1979, the TRS-80 had the largest selection of software in the microcomputer market. The basic system can be expanded with up to 48 KB of RAM (in 16 KB increments), and up to four floppy disk drives and/or hard disk drives. Initially (until 1981), it lacked support for lowercase characters which may have hampered business adoption.Īn extensive line of upgrades and add-on hardware peripherals for the TRS-80 was developed and marketed by Tandy/Radio Shack. While the software environment was stable, the cassette load/save process combined with keyboard bounce issues and a troublesome Expansion Interface contributed to the Model I's reputation as not well-suited for serious use. A cassette tape drive for program storage was included in the original package. The TRS-80 has a full-stroke QWERTY keyboard, the Zilog Z80 processor, 4 KB dynamic random-access memory (DRAM) standard memory, small size and desk area, floating-point Level I BASIC language interpreter in read-only memory (ROM), 64-character-per-line video monitor, and a starting price of US$600 (equivalent to US$2,900 in 2022). It is one of the earliest mass-produced and mass-marketed retail home computers. The name is an abbreviation of Tandy Radio Shack, Z80. 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. Monochrome 12" CRT, 64 × 16 character semigraphics
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