Asteroids Trailing Lines

ScottSerpa

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Donor 2016
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Ok, I admit, vector boards intimidate me. Maybe it's the way Atari schematics are broken up but I've never really gotten a good understanding of these circuits.

This one works with trailing lines coming from the asteroids. The only thing I have found that doesn't look right is ADMA11 stays low and LOAD11 is low with only occasional pulses. I have changed out J5 and J6 with no difference.

I understand road.runner is the Atari vector guru. I sent him a PM but any help is appreciated.

My camera has a hard time taking pictures of CRT monitors but hopefully these will get the point across.
 

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Last edited:
Fixed

Problem turned out to be a bad 74LS20 at C5. A big thank you to Alex at Elektronforge for your help.
 
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