I've got the 4-1/high score save adapter and I want to convert my ms pac to use it. However, it doesn't have a ms pac daughterboard (I am only now learning that mine is not a "true" ms pac). What exactly do I have to do to convert to the 4-1? I'm guessing it's a rom change only (aside from installing the adapter board)? Which roms do I need to change?
