>I was curious (and a little bored) so I looked it up from history.dat
Awright. I should have checked source code file in MAME source code to see if that info was in there.
The only one revision bug that first comes to mind is Atari Asteroids when a new 9th place or higher score supercedes the 10th place which causes the 10th place score name to be truncated from 3 letters down to 2 letters. Not an easy bug for testing. It took several dollars and a bit of patience to verify that actual hardware bug. If only I had Atari Coinop news letters from 1980s, then I would have already known about that bug since it would have been mentioned along with an upgrade announcement.
I had to revisit an actual Asteroids cab to confirm that was an actual hardware bug back in 2001 in which it became a BTANB entry. Andy Welburn eventually had an Atari revision fix rom that Atari released in order to fix that bug which is now considered the parent Asteroids rom set supported in MAME.