NES™, SNES™, Nintendo 64™ N64™, Famicom, Sega Saturn™, Genesis, MegaDrive™, Master System™, NEO-GEO™, ATARI™, Turbo Grafx 16™, 3DO™, Amiga™, Mark III™
We don't make adapters for outdated systems currently, nor do we have immediate plans to make them. Many people are playing these games on their PC via emulation software, and the X-Arcade™ works perfectly with all emulators.
Although we cannot guarantee nor support them, some of our customers have used our Playstation™ or 5in1 adapter with PS2-(insert system here) adapters. Examples here and here. Here is some more info on the Tototek adapters (thanks to Philip Byrd).
Amiga: There is a discussion of some options for Amiga™ here.