Tandy Radio Shack TRS 80 Model 4
Photo 1: 4throck, CC BY-SA 2.0 fr, via Wikimedia Commons (Radio Shack TRS-80 Model 4 no background.png) Photo 2: TRS-80_Model_4.jpg: Blake Patterson Minor changes made by Ubcule, CC BY 2.0, via Wikimedia Commons (TRS-80 Model 4 (modified).jpg)
Personal computer, 1983, Tandy. The TRS-80 Model 4 is the last of the Z80-based TRS-80 line, an all-in-one machine in a white case that runs the Model III software in compatibility mode and, in its own mode, offers a faster 4 MHz processor, 64 or 128 KB of RAM and an 80 x 24 display, enough to run CP/M and the TRSDOS 6 operating system with its own BASIC. It was sold until 1991 in desktop and later portable (4P) and gate-array (4D) versions.
| Years | 1983 to 1991 |
|---|---|
| Processor | Zilog Z80A at 4 MHz (2 MHz in Model III mode) |
| RAM | 64 KB, expandable to 128 KB |
| ROM | 14 KB with Model III BASIC |
| Display | built-in 12" monochrome CRT, 80 x 24 or 64 x 16 characters |
| Storage | up to 2 internal 5.25" floppy drives of 180 KB; external hard disk |
| Operating system | TRSDOS 6 (LS-DOS), CP/M, Model III operating systems |
| Ports | RS-232, parallel printer, cassette, expansion |
| Price (1983) | US$1,999 with two drives and 64 KB |
Documentation
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