As far as I know there is no Nes emulator as of yet, there may be a patch, To get the gameboy roms to work all you have to do is make sure the player is set to view supported files (or all) by going to the "files" section of the main menu and holding down a certian button, I don't know which it is as I don't have an IPOD but, once you can see supported files, or all, you just click on the romfile which should show up whereever you put it!