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Okay, Let's say I DID want to try replacing one or more of my Z80s. Are they or something equivalent still manufactured or do I need to try to find a vintage part? Also, now that I think about it, my Z80s actually say "NEC" on them and not "Zilog" or for that matter "Z80". Does this mean...

"The Z80's should all be the same type, so you might want to try swapping the order that they're in to make sure there's not a problem with one of them." Yeah, That was the problem alright. Either one of my Z80s was bad or was not making a good connection. I switched two of them (4J and 4M)...

Nope, no luck. The connector was pretty dirty, but after cleaning it and making sure that none of the socketed ICs were loose I am still having the same problem. Is there anything else obvious I should try? If not could someone direct me to some literature that might give me a better idea of...

I am a novice trying to work on an 1981 upright Galaga that has been sitting in my mother's basement for years. It HAS worked in the not too distant past. Initially it just gave me a white screen and occasionally some video garbage and unpleasant noises. After cleaning the pins and re-setting...