An other MegaPlay motherboard, missing IC33 (PAL16L8, ref. 315-5654) | Arcade-Projects Forums (arcade-projects.com)
I'd like to know at least what the motherboard does when IC33 is pulled.
Since it's a L PAL you should even be able to dump it easily using the 256KB EPROM method.
You know it makes no difference for me. I can dump it no issue.Sadly it's not easy as you may think.This PLD, altough it's a PAL16L8, uses internal latches (also combinatorial devices can have this configuration) hence every attempt of dumping it as a 27020 will EPROM fail (like it happened to other people me including).A deep analysis/observation of the device is needed in order to figure out the internal logics.I hope it's clear now.
Hope it's not too far away. Spring cleaning is coming