I've done thousands of swaps, and i'm well aware of how to do it. I've even used some discs which requre a double swap or a fast swap. As I said, i've been doing this for years. Hell, I can't even remember the last time I screwed up a swap i've done it so much. And i'm not talking about a once off occurance, and this happens on all my disks, even swapping between two originals. If I had screwed up the swap, it would've dropped back to the cd player with a data read error.
I just spent 15 minutes messing around trying to get disks to boot with ones from other groups, with no luck, but they booted with ones of thier own group first time. Here are the groups that some of my games belong to:
Sonic 3D blast
AMOK
HOTD
Lemmings 3D (double swap)
Duke 3D
Hexen
UMK3
Ghen war
Noon
Daytona USA CCE
Sonic R
Mighty hits
Die Hard arcade
Legend of Oasis
Dead or Alive
Sega Rally championship
Virtua cop 1
Virtua cop 2
Panser Dragoon II
I cannot boot Sonic R with Ghen War for example, but it'll boot with Daytona every time. There is not one variation to this rule i've come across at all. I'm using a European saturn MKII, and all the originals I have are European games. I actually live in Australia, but we fall under the European country code. The bios is V1.01. The fuill thing it says is PAL-C-V1.01. Does anyone have any idea what that C means?