So … I made some progress.
I couldnt figure out why the 3do core wouldnt run from my 8tb launchbox drive so I downloaded another instance of retroarch to my desktop.
The bios either werent named right or working so found the bios in my launchbox hdd in emulators>4do and copied all those into the new retroarch instances system folder.
It then would run but switchres wasnt working.
So I created a core overide which gave me a folder “opera” and inside a opera config file.
I copied over the known working bios to my 8tb hdd and also moved over the opera config file.
I noticed the opera config was blank so copied the contents of sega cd config to the opera file and saved it.
I then remembered the opera config was inside an opera folder and that the config wasnt just placed inside the config folder on the other instance of retroarch I had running.
So I created an Opera folder inside the retroarch config folder, and put the opera config file in there…
Bam… 3do in 240p goodness!!!
You were right, in RA quickmenu there is option for 240p or 480i.
So all looked great loading up way of the warrior in 240p untill I get into the game and all the gameplay is slow and audio is slow. Any ideas why this could be? It runs great from 4do standalone emulator but seems like half speed in retroarch core.
Another disappointment is… in bigbox I chose to launch from retroarch and it does nothing.
In launchbox if I go to manage emulators and set retroarch for default for 3do…it reports that the core"4do.libretro" is missing.
Now Im not sure if this new “opera” 3do core is really 4do or some other “new”
“opera” emulator… but either way, it seems launchbox is looking for 4do libretro instead of opera for some reason.