1976, Warner Communications buys Atari from Nolan Bushnell for
$28 million. In december 1978, Atari announces the Atari 400 and
computers, using the 6502 microprocessor. In october 1979, Atari
begins shipping the Atari 400 and Atari 800 personal computers.
In december of the same year, Sears begins selling
Atari home computers.
These computers used cartridges for software media and also had a cassette
program recorder to save the program you created using the basic computing
language cartridge. In may 1981, Atari announces the 8KB Atari 400
is being discontinued.