> > No it's Ketsui so it's eprom and the patterns would have been blanked by hand. > > Even with eprom, if they didn't clear the eprom programmers buffer before programming > a chip and just loaded a smaller file then you get this kind of stuff. > > We've seen games that include source code etc because of this.
So it would be easy to test if this content is part of the game or not. Replace differing content with 00s and launch the game to see if it complains.