@jsh139 It’s a Midway 8080 board, which is actually two boards stuck together, that apparently had a bunch of different model numbers that may or may not make a difference, but are all hard to find online anyway. I’m taking it into an arcade repair shop that thankfully still exists, I’m really hoping I’m lucky and it’s just a capacitor that is broken, but I have a feeling it’s just way too corroded.
Tetris is not, strictly speaking, a classic arcade game, and certainly not first wave classic like the others in this poll. It appears that, even when it was in the arcades, it was there in the late 80s – looks like 1988.
I wish I hadn’t sold my Mortal Kombat machine. It was an original 1992 MK1 dedicated 25" cabinet. Had MK2 and Killer Instinct PCBs that I would swap out. It was getting expensive to maintain, and it took up a lot of space. I’m sure it would be worth a pretty penny today.