I know that they're making an emulator that's a form of mame (dj station I THINK, search around ) That emulates: All beatmania ORIGINAL mixes, minus final Pop'n stage EX and original I think those are the two series :\ Other people are trying to emulate the bemani [DDR, Pop'n series, Guitar freaks, etc.] and bemani twinkle [iIDX] arcade systems, but there are supposedly complications