Well, I got RetroPie set up and added a couple of Roms. I noticed when setting up the game pad that it seemed to be jumping to the next or previous input option, but I though that maybe it was supposed to do this. I started a game and noticed that, at about every six or eight seconds, my character would turn or move just a little bit.
Well, it turns out that this particular game pad has been known to have ghost pressing issues with the D-pad. That's the problem, and there's no way to fix it, so I have to look for another game pad to buy.
Unfortunately, I went to Amazon to set up the return, but this is a non returnable item, as it's one of those "Fulfilled by Amazon" items, but sold by someone else through them, and this seller doesn't allow item returns. With that said, I called Amazon, and they were nice enough to give me a refund, so that's good.
For the time being I'm going to use my keyboard, but I'm looking at a cheap two pack of USB SNES controllers. They're probably not the greatest, but what can you expect for $17? LOL. I just want to play Zelda and Final Fantasy IV (or II, as it was originally released in the US). Plus, I'm looking at some old Arcade games like Donkey Kong and Galaga. This should be fun!!!
I also found out that my wireless Logitech keyboard and mouse work with the Pi, so that's great. The less cables laying around, the better. I know that they work with Raspbian, as that's what I tried it with first, and I just wrote Ubuntu MATE to one of the new sd cards I bought, so I'll try them with that, too. I expect that they'll work with the Ubuntu MATE, too. :) The RetroPie? I don't know. I'll try it, though.