Yeah the RetroArch core is the way to go. It's a lot more advanced than the stand alone 4DO, which has been dormant for years, and in fact that core was recently renamed Opera, to avoid that confusion.Hmm, I'm curious, what is the state of 3DO right now? I never hear of new emulators coming out to support it (and if Immercenary doesn't run well, is that the only known-name game that doesn't work?) or anything like overclocking or polygon render improvement systems or anything fun like that. (I'm reading up now on the 4DO emulation core for RetroArch...)
I do know that M2 emulation got some news in the last two years (the console itself was canceled in production but there were other weird uses of the technology that did come to market) but that's about the extent I have heard about a 3D0 emulation fanbase before this thread.
I have tried it with a handful of games and they worked very well. It seems to have come a long way.