Personal computing never would have gotten started if not for the invention of microprocessors, which puts a computer’s CPU (central processing unit) on a single chip – sometimes with companion chips. Intel released the first commercial CPU in 1971, and the first 8-bit “home computers” arrived just a few years later.
In November 1983, Tandy entered the world of PC compatibles with one of the most powerful MS-DOS computers to date, the 8 MHz 80186-based Tandy 2000. This was long before IBM released the 6 MHz IBM Personal Computer/AT in August 1994.
In 1977, there were three home computers: The Apple II, the Commodore PET, and the TRS-80, which was sold at 3,500 Radio Shack stores across the United States. Apple and Commodore used the MOS Tech 6502 CPU in their computers, but Radio Shack chose the Zilog Z-80.