Tandy Radio Shack TRS 80 Model 1
Photo 1: Dave Jones, CC BY-SA 4.0, via Wikimedia Commons (Radio Shack Tandy TRS-80 Model I System.JPG) Photo 2: Rama & Musée Bolo, CC BY-SA 2.0 fr, via Wikimedia Commons (Radioshack TRS80-IMG 7206.jpg)
Personal computer, 1977, Tandy. The TRS-80 Model I was launched by Tandy Radio Shack in August 1977, with the Apple II and the Commodore PET, as one of the first mass-market personal computers, and it was the best-selling of the three for the first years thanks to Radio Shack's thousands of shops. The system is a keyboard unit with a Z80 processor and Level I BASIC in ROM, a separate monitor and a cassette recorder, all sold together for US$599; the Expansion Interface added memory, floppy drives and a printer port.
| Years | 1977 to 1981 |
|---|---|
| Processor | Zilog Z80 at 1.77 MHz |
| RAM | 4 KB, expandable to 16 KB in the keyboard and 48 KB with the Expansion Interface |
| ROM | 4 KB with Level I BASIC, 12 KB with Level II BASIC |
| Display | 64 x 16 characters monochrome, 128 x 48 block graphics, on the separate monitor |
| Storage | cassette; 5.25" floppy drives through the Expansion Interface |
| Ports | expansion bus, cassette, video |
| Price (1977) | US$599 with monitor and cassette recorder |
Documentation
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