Radio Shack TRS-80 Microcomputer System (Model I)

Source: Radio Shack, ~1978

This roomful of TRS-80s appear to be undergoing some kind of QA testing. Radio Shack, along with Apple and Commodore, was one of the first companies to sell microcomputers at scale in 1977. By 1979, it had sold 100,000 of these Z80-based systems.

Considered ugly and referred to as the “Trash-80” by some, this computer was reliable with a strong, fiercely loyal vendor and user base. Help was only as far away as the nearest Radio Shack store if you needed it.

The Model I was never officially branded as such. Radio Shack sold it as the TRS-80 Microcomputer System. The company followed it with systems branded TRS-80 Model II and Model III, and the original TRS-80 was commonly called the Model I after that, even by many at Radio Shack.

Original Retail Price: $400 to $600
Base Configuration: Z80 CPU, 4K RAM (16K max), 4K ROM (12K max), integral keyboard, Level I BASIC, user manual, AC adapter
Video: 16-line x 64-column uppercase text, 128 x 48 graphics
Size/Weight: 16.5 x 8 x 3.5 inches
Important Options: TRS-80 Expansion Interface, CTR-41 cassette recorder, external 5.25-inch floppy disk drive with TRSDOS, 12-inch monochrome monitor, Level II BASIC, RS-232 interface, Modem I

Published by

Michael Nadeau

I am the author of Collectible Microcomputers (Schiffer Books, 2002) and have been an editor of many technology publications including BYTE, 80 Micro, and HOT CoCo. My interest in the history of information technology is broad. I use my blogs, ClassicTech and Vintage Computer Photos, to build on the work I did for Collectible Microcomputers.

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