This is a coincidence. I have my Popeye on loan to The Sanctum in CT. It has an opto out that I am pretty sure is going to be an LM339 on the opto board. But before replacing the chip I figured I would pull a board from a different game to test. When I told them I was going to pull it from an IJ I have in storage I got a couple of comments.
Why do you have a Popeye setup and your IJ in storage? You know you will probably be the first person in history to take parts from an IJ to fix a Popeye.
Thanks for the list above. I knew BSD and DW had the exact same board by number. I did not know Corvette, MB and WCS. One of those might be easier to get to, definitely MB since it is setup. I'll have to look to see what you mean be mounting is different. Are the holes the same just position? Are all the keys pins on the headers the same . . .