Cool hack! Thanks for laying out the steps in such detail. One specific comment: >While the board was out, I removed the battery holder from the MPU board. The

Cool hack! Thanks for laying out the steps in such detail. One specific comment: >While the board was out, I removed the battery holder from the MPU board. The board needs 3x AA batteries to keep the CMOS RAM powered to maintain the high score list while the machine is off. I’d read that these batteries could sometimes leak onto the circuit board, causing substantial damage. You can also use Lithium primary AA batteries, not to be confused with rechargable lithium-ion cells. They are better than Alkalines in just about every way, including that they do not leak. The only reason Alkalines are so popular is that they are slightly cheaper. In this application, you probably want the best cells possible.