I used FlyCast and it .... worked.... One of the emulators crashed on me but I don't recall which one. I'll try ReDream again as it did load but seemed a little goofy but that's probably due to my inexperience with it. Took me a few minutes to realize the mouse was working and had to exit using the commands and not through RetroArch. I'll give it another whirl.
Part of the problem is not really having anything off the top of my head that I would specifically play on Dreamcast. Nearly everything over the years that I had has either aged terribly and not worth the trouble or has been updated or remade on better systems.
PSO has been redone and done better, Skies of Arcadia is on GameCube, etc.
@Swedishkiller12 It has more power and an important software part (GLES compatibility) is solved/improved. The emulators on N64 still could need some work, but the Pi 4 will most probably be a big improvement on N64 games. We can't say more than this.
Though I find it hard to believe I'm the only one wanting to use a x86 machine but with the same user experience as RetroPie on a Rpi.
So no desktop just plain retro gaming, seamingless. I can't find any good tutorial on this. Makes me wanna go back to my Rpi...
Problem with the Rpi is that it isn't powerful enough to Run Dreamcast and GameCube games.