Motorola 68000 based 16-bit computer made by Atari corporation. Also known as the 'Jackintosh'. Ran the TOS operating system with Digital Research's GEM interface. Main competition was the Commodore Amiga (which by all accounts could have been the next Atari computer if you know your history). Although the Amiga had excellent custom graphics and sound chips courtesy Jay Miner (who did Atari 400/800 chip design) it ran at a slower clock speed than the ST.