I'm building a custom arcade cabinet after helping my friend on his and seeing how well it turned out. I decided on my Raspberry pi as the computer of choice, but I tried uploading some roms to my pi and it didn't seem to work, and I think it's because I might be using the wrong format. What rom formats work for each of the systems emulated? I think I got the Atari ones on all right, but I can't seem to find the emulator on the pi to use them (I'm not very tech savvy)... I was also wondering if I need to do anything special to set up a usb mame kit I ordered on Amazon. It has some buttons, a joystick, and a chip that lets you plug into usb