A computer manufacturer specialising in consumer computers, Arcade machines, and of course home video game systems. After the failed Jaguar Atari's coin-op division (Arcade machines) split from Atari proper, and have remained in business.
Atari's entry into the home computer was dominated by designs by Jay Miner. It is to be said the Amiga 1000 follows in the Atari 400 tradition of really powerful custom ICs, such as the RIOT chip.
There are a few emulators for various models of the Atari ST's.