I recently had someone who was convinced their U5 chip on their MOVFR board was the reason their detector edge wasn’t working. I went to the job and it ended up being a bad traveler wire, but I did bring a chip with me just incase. I noticed GAL files off the actual component number before they sell you the chip, and just boxes it with their part # (DDPC-0001N). I called GAL to ask them if they could give me a component schematic for the chip, so I can test them to confirm if they are bad or not. The tech I spoke to says he doesn’t know and has no documentation on it. I know it’s a long shot, but does anyone know what the actual manufacturers number is? I have no interest in getting it cheaper from a different company, I just like being able to confirm whether a component is bad or not.