Cartridge only!
Atlantis is a fixed shooter video game released by Imagic in July 1982 for the Atari 2600. It was written by Dennis Koble who also wrote Trick Shot, Solar Storm, and Shootin' Gallery for Imagic. Atlantis was ported to the Atari 8-bit computers, VIC-20, Intellivision, and the Magnavox Odyssey