IIRC, Saturn really isn't much different than Dreamcast in the VGA support department - i.e. you need to have the appropriate cable to get the signals into a VGA monitor, and the game needs to set up the video processor/RAMDAC to generate a VGA signal. I'm not aware of any Saturn games that do this, and presumably the big difference between Saturn and DC in this regard is that Dreamcast actually allows detecting what kind of cable is attached (speaking of which, I need to find a way to put a VGA/RGB switch on my VGA cable...). Without being able to do that, there's really no way to negotiate an appropriate signal since TVs can't generally display at VGA scan rates, and VGA monitors generally can't display at TV scan rates. There are exceptions to this, of course, but not enough for it to really be that useful.