r9421 /src/mame/ (machine/snes.c video/snes.c): [SNES]: Fixed regressed PPU open bus behaviour, fixes background graphics in Super Kick Boxing

http://www.bannister.org/forums/ubbthreads.php?ubb=showflat&Number=52384#Post52384

Deja-vu ... (yes, there are PPU registers that returns MDR instead of PPU Open Bus)