Here are the best places to get cheat codes, besides the cheat devices' official websites.
BSfree is probably one of the largest browsable databases out there. It's a tad bit buggy, though.
If you know of any other good ones, list 'em here.
i'm having trouble adding cheats in not sure if it's just cause i'm on a new version or something but the window that pops up to add cheats just closes the emulator down, not sure what i'm doing wrong any help would be greatly appreciated