Groundbreaking feature of Xevious is the appearance of the "bakura" or "bacura" looks like the Space Odyssey Monolith 1:4:9 spinning on its Y axis, this was like the first enemy in a game which teased you into shooting at it but turned out to be indestructible so you must dodge.
Home version is nowhere as good, in large part because the screen is turned 90 degrees, but still an ok game. Arcade graphics were hypnotic, almost as good as 16 bit. 25th November 2002: Satoshi Suzuki added another bootleg of Xevious. 0.63: Added clone Xevious (Atari set 2). A fighter pilot flying the Solvalou space ship is the last hope for the Earth. 15th January 2004: Pierpaolo Prazzoli added another version of Xevious. Xevious 3D/G+ is a compilation of four titles: Xevious 3D/G (main game), Xevious (Arcade version), Super Xevious (Arcade version) and Xevious Arrangement. 0.78u5: Added clone Xevious (Atari set 3). The wiki says commercial also had the line "the arcade game you can't play at home". 0.79u1: Added Namco 54XX (1536000 Hz) sound and fixed gfx3 roms loading. The highest score possible is 9,999,990, at which point the game terminates abnormally and resets. These enemies do appear in the game-play of 'Super Xevious' which uses the same graphics data as Xevious. I saw it myself and never forgot the slogan "Are you devious enough to beat Xevious?". The graphics ROMs contain several additional enemies which dont actually appear in game-play including a silver-grey Galaxian flagship. Xevious was the first arcade title to have a TV commercial on the broadcast networks.
The best import was done by "Glenn The 5200 Man" and adds a 128 color title screen plus numerous firing control options. Anyway, I'm not sure there was an 800 version other than imports of the 5200 cart modified to run on 800. As long as there's no dload here, you can find the model 5200 cartridge in the 5200 section.