Raz. vous propose son kit « dev toi meme ton xor pour progear » (copyright DjLc).
It’s now been quite a while since any games have been released on CPS2 hardware so I feel the time is right to throw data out there for anyone who wants to try and understand the algorithm used. I have spent the last few months gathering information up together including ROM space fills and all possible values for one address, you can download from here.