What i cant figure out is how to update individual roms for a newer version of the emulator. So if you have a set of roms like this one, google CLRMAMEPRO, and update them with it (you may want to watch some tutorials on how to update roms with CLRMAMEPRO). The program is not easy to understand and handle, but its the easiest way compared to other ways to update roms (downloading newer versions of every single rom of all the 3500). So if you update the emulator, you will have to update the roms too, and the easiest way to do that is via a program called CLRMAMEPRO. If you have the older version of the emulator, it will be able to read older roms, but if you download a newer version of the emulator, it will be able to read the newer roms, but not the older ones. Its a bit more complicated than you all might think.