Is there a source for these? I picked up a supposedly working Gaplus PCB, but it didn't boot up when I put it in my Galaga cab. Started pulling chips, cleaning legs, and reseating. The GA2-4 chip at 3F had corroded legs, and came out missing a few. Looks like it's just a ROM, though, so it shouldn't be terribly difficult to replace.
The chip at 5F is in similar condition, but I haven't pulled it for fear of destroying what's left. The "preliminary" manual I found in PDF lists this as "15xx custom IC."
The only mention I found of these was on this list of NAMCO part numbers. Looks like these were in Mappy and Super Pac as well.
Are they available somewhere, or am I going to have to luck into a dead Gaplus/Mappy/Super Pac PCB to cannibalize?
The chip at 5F is in similar condition, but I haven't pulled it for fear of destroying what's left. The "preliminary" manual I found in PDF lists this as "15xx custom IC."
The only mention I found of these was on this list of NAMCO part numbers. Looks like these were in Mappy and Super Pac as well.
Are they available somewhere, or am I going to have to luck into a dead Gaplus/Mappy/Super Pac PCB to cannibalize?

