Nice seeing ROM cheats being done for so many different cpus by someone else.
I think there may be a slight bug with the above though as you haven't completely NOPed the 3 byte instruction at FFAF9A which leaves a HALT at FFFAF9C which might cause problems. This may work better and is a little shorter:-
Thanks. I played the entire game with it and it didn't crash despite the halt opcode. I can't believe I forgot to add an NOP to it. Thanks for fixing it. Does Virtua Fighter 2 and 3 even run on MAME?