Quoted from mack505:
Isochronic_Frost interesting, toddtuckey took that whole board next to the MPU out it looks like? at 3:34 in
Yes, I’d leave it in, put a sticky note on it marking it as “not used” it’s only useful for location play. It is a tiny watchdog board that will force reset the game if it detects that it’s locked up. They are sensitive and after 30 years they have gone bad and trigger random resets and other bizarre issues. Maybe one day someone will buy it and put it in a museum 50 years from now, you never know.
For your use, it is best unplugged, unless you plan to leave the game on all day unattended. I’ve left mine on for 5-6 hours while I’m playing in the gameroom without issue. You just want to sometimes check to make sure the game didn’t lock up for whatever reason. It happened a lot on location, home use it’s unlikely so the small watchdog reset board is not needed.
Disconnecting it will help eliminate one more possible problem area. Make sure the game is off. Just unplug it and put some electrical tape over the plug.