I have the main unit, disk unit and keyboard.
type computer
country USA
year 1979
os TRS-DOS, Basic
cpu Zilog Z-80A
speed 4 MHz
ram 32 KB
graphic 12″ monochrome monitor 40×24 or 80×24
colors mono
ports two serial ports, parallel
The TRS-80 Model II — The Business TRS-80
Released in 1979, the TRS-80 Model II was Tandy’s professional business computer — a significant step up from the consumer-oriented Model I, designed specifically for small business computing. Using a Z80A processor at 4 MHz with 32 KB of RAM (expandable to 64 KB), an 8-inch floppy disk drive, an 80-column display, and the ability to run CP/M as well as Tandy’s own TRSDOS, the Model II offered genuine business computing capability at a price competitive with dedicated word processors and minicomputers.
8-inch Floppies — Professional Storage
The Model II’s 8-inch floppy drives were a statement of professional intent — 8-inch disks were the standard for business computing in 1979, used in CP/M systems and minicomputer installations worldwide. Each disk stored 500 KB, providing substantial file storage for business applications. The Model II’s disk system was significantly more capable than the Model I’s cassette tape storage, enabling genuine business applications like word processing, accounting, and database management that required fast, reliable access to large amounts of data.
CP/M Compatibility
The Model II’s CP/M compatibility gave it access to the growing library of business software that Digital Research’s operating system supported — making it competitive with dedicated business systems from established companies while selling through Radio Shack’s retail network at prices small businesses could afford. The Model II found particular success in small business environments where its combination of CP/M compatibility, reliable 8-inch drives, and Tandy’s service network made it an attractive alternative to more expensive minicomputer solutions.