TRSDOS
Operating system
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TRSDOS is the operating system for the Tandy TRS-80 line of eight-bit Zilog Z80 microcomputers that were sold through Radio Shack from 1977 through 1991. Tandy's manuals recommended that it be pronounced triss-doss. Wikipedia
Initial release: Model I in 1977; 47 years ago
Latest release: Model 4 Version 6.2 / 1984; 40 years ago
Source model: Closed source