I've got a top metal die shot of Merlin. I'll post the PLAs. I can't find pics with the top metal removed, but I assume I have some somewhere. But I think the PLAs can be verified from the top metal shot.

I'm pretty sure Kevin dumped Maniac (from Ideal); he's got a file on his site that has the same code number that was on the chip I decapped. My game had the PIC1655A version and I was unable to dump it, and I cracked the die when I decapped it. I might be able to match up enough bits to confirm that they are the same, or I can write up the PCB wiring and you can see if Kevin's code works.