I'm shocked it took you guys this long to get annoyed. I was done at his 20th post.
Good day.
It's like he needs to take Electronics 101 class first.
That's the thing though. His counters seem to include some knowledge, but maybe from a different type of theory and background of application.
good day.
copy paste responses from another forum?
why does knowing exactly how 2 different types of power supplies regulate the power rails and why they use this that or the other thing going to help you with your system? it doesn't. if your 5 volt is off, adjust, fix, or replace it.
having a game you are trying to fix is one issue... asking question after question after question about the idiosyncrasies of game board engineering is a little ridiculous. I get that some people need to understand how something works to figure out why something doesn't (hell i'm one of those people.) but this is a little overboard. "in general" questions aren't going to help you with your SPECIFIC case. at the time, most game makers custom made all their hardware. A likely fix for one game probably won't translate to another even though they are similar.
things iv'e gotten from your multiple multiple multiple threads.
you have a game board that doesn't boot properly (likely scrambled video image) with a monitor that doesn't quite display as it should.
reseat the socketed chips, replace the power supply, and recap the electrolytic capacitors in the monitor. this machine is damn near 30 years old. it's going to need some work.
also in the future you can just start ONE thread (IE: "having an issues with galaga game - need major help") and post all your questions in there. that way your info isn't scattered all over hell's half acre.
good luck. You'll need it.
as for your original question about 3 CPU's...
why waste gameplay CPU cycles having to deal with video and audio when you can have a separate CPUs deal with it. if there was only 1 CPU the game would have to sacrifice game quality to be maintained centrally or be insanely slow. by separating the systems you can have great gameplay mechanic, fluid video processing, and multi voice sound all happening concurrently, processed separately and being merged together at the end for the user to experience.