Basically what I've read about on gamer forums is that in fact Primal Rage alone is NOT emulated. I dunno wtf the reason is as I dunno what hardware it uses. Perhaps the PS2 (slowest and lowest mem of the lot) couldn't handle being emulated completely short of audio or what. Whatever the reason is, that game is a recoded PORT. Also as a recoded port some of the moves have been redone in the game now copycatting basic Street Fighter 2 patterns for attack (you can get a guide for the game alone at gamefaqs.)

That's what I mean.