Well, problem sorta solved. I wasn't satisfied with the picture quality of the 7800 I had, so I bought an S-Video modded one of E-Bay (yes, I know it's apparently not that hard to do the mod myself, but I have more money than time right now...), and the harmony cart works great with it, Supercharger games and all. So I guess it'll be a while before I mess around with the one that doesn't work with Harmony and Supercharger games. Thanks for the help/advice anyway, everyone....