Utilising the XE Light Gun (as the 7800 never had a dedicated light gun) the aim of the game is to protect four different worlds from alien attack. The Atari 7800 is backwards compatible with Atari 2600 games, but not Atari 5200 games. As far as I can tell, there was one single European-only 7800 release in 1991 (and none in 1992), and that was Sentinel by Imagineering. What I’m surer about, however, is the final European release. Release dates for Alien Brigade (Atari 7800) database containing game description & game shots, cover art, credits, groups, press, forums, reviews and more. It is almost fully backward-compatible with the Atari 2600, the first console to have backward compatibility without the use of additional modules.It was considered affordable at a price of US$140. The Atari 7800 ProSystem, or simply the Atari 7800, is a home video game console officially released by Atari Corporation in 1986. It had instant backwards compatibility with the Atari 2600, its predecessor model.Three games from the Mario series have been released for this system: Donkey Kong, Donkey Kong Jr., and Mario Bros. The Atari 7800 is backwards compatible with Atari 2600 games, but not Atari 5200 games. The Atari 7800 (also known as the Atari 7800 Pro System) is a video game console released by Atari in 1986.It was one of the Nintendo Entertainment System's greatest competitors. The Atari 7800 is a 8-bit video game console.It was competing with the Nintendo Entertainment System and the Sega Master System.It was Atari's third-to-last attempt to create another video game system that would be a successor to the Atari 2600.It was a short-lived success. The Atari 7800 is a 8-bit video game console.It was competing with the Nintendo Entertainment System and the Sega Master System.It was Atari's third-to-last attempt to create another video game system that would be a successor to the Atari 2600.It was a short-lived success.