Don't worry Juan, I ve wasted two weeks! Going crazy trying to understand by myself.. I wiil wait for your answers without hurry. And you are very kind Ok I've just tested bubble bobble 1 and works fine with core B. I have downloaded other roms about this game, like bubble bobble symphony and I think lost cave...they don't work! Is symphony the same of bubble bobble 2 ? Then I want to play for now to final fight, Cadillac and dinosaurs, all the sunset riders (the first works perfect in one of your cores, don't remember which ) Other doubt are about sega and snes emulators...because I knew that super Nintendo did a port for final fight, but I ve readed that they did a lot of cuts and that the snes wasn't powerful enough to emulate fight, so I just wanted to know if this game is better in arcade emulation, with mame 2003..