1976, Warner Communications buys Atari from Nolan Bushnell for $28 million. In december 1978, Atari announces theAtari 400and800personal computers, using the 6502 microprocessor. In october 1979, Atari begins shipping theAtari 400and Atari800personal computers. In december of the same year, Sears begins sellingAtarihome 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 8KBAtari 400is being discontinued. .