Tandy Radio Shack TRS 80 Model 3
Photo 1: Bilby, CC BY 3.0, via Wikimedia Commons (TRS-80 Model 3 01.jpg)
Personal computer, 1980, Tandy. The TRS-80 Model III replaced the Model I in 1980 as an all-in-one machine: keyboard, 12" monitor and space for two 5.25" floppy drives are in one case, which solved the radio interference problems that had forced the Model I off the market. It runs the Model I software with a faster Z80 at 2 MHz, has lower-case characters as standard and a cassette interface at 1500 baud, and it was sold in schools and small businesses with TRSDOS and later LDOS.
| Years | 1980 to 1983 |
|---|---|
| Processor | Zilog Z80 at 2.03 MHz |
| RAM | 16 KB, expandable to 48 KB |
| ROM | 14 KB with Model III BASIC |
| Display | built-in 12" monochrome CRT, 64 x 16 characters, 128 x 48 block graphics |
| Storage | cassette; up to 2 internal 5.25" floppy drives of 180 KB |
| Operating system | TRSDOS 1.3, LDOS, NEWDOS/80 |
| Ports | RS-232 option, parallel printer, cassette, expansion |
| Price (1980) | US$699 with 4 KB, US$2,495 with two drives and 48 KB |
Documentation
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