User blog:RadSpyro/Dreamcast Cheats not working?

So I FINALLY got my Dreamcast working again - Woot! And shortly after switching it on, I was hit with nostalgia. And I also remembered something.

I could never get the 'defeat/revisit boss' cheats to work - Has anyone managed to get them working on their copy at all? I'm really interested in seeing the 3D cheat in action (Esmerelda).