description TRS-80 Model I Overview
The TRS-80 Model I, launched by Tandy Corporation through Radio Shack stores in 1977, was one of the three machines—alongside the Apple II and Commodore PET—frequently credited with launching the personal computer era. Built around a Zilog Z80 processor, it shipped initially with 4 KB of RAM and Level I BASIC, with later units offering Level II BASIC and expandable memory. Packaged as a keyboard unit with an optional monitor and cassette storage, it was aimed at hobbyists, students, and home buyers.
help TRS-80 Model I FAQ
What processor does the TRS-80 Model I use?
The TRS-80 Model I is built around the Zilog Z80 processor running at approximately 1.77 MHz. This was one of the most popular 8-bit CPUs of the era, also used in many other early personal computers.
How much did the TRS-80 Model I cost when it launched?
The TRS-80 Model I launched in 1977 through Radio Shack stores, with the base system priced around $600 including a monitor. This was notably cheaper than the Apple II, helping drive early home computer adoption.
What were the '1977 Trinity' of personal computers?
The TRS-80 Model I, Apple II, and Commodore PET are collectively known as the '1977 Trinity,' as all three launched that year and are widely credited with kickstarting the personal computer era. Each targeted a slightly different market segment.
What display did the original TRS-80 Model I use?
The TRS-80 Model I used a modified black-and-white television or a dedicated monochrome monitor displaying 64×16 text characters. It did not support color graphics, unlike its contemporary, the Apple II.
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