It's really not a serious modification, since the Bios sits in a socket and isn't soldered on. And besides, very few functioning MVS systems haven't had some f

It's really not a serious modification, since the Bios sits in a socket and isn't soldered on. And besides, very few functioning MVS systems haven't had some form of modification; at the very least, the timebomb-of-doom battery has likely been replaced with something that won't eventually leak and dissolve half the board.