Asteroids Deluxe video issue

Mr Do

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Replaced M6 74LS175N Quad D flip flop

Did not help.

Test switch causes screen to go blank.

Any thought?
 

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Did you ever find a fix on this? I have the same thing happening with one of my asteroids boards. Images are doubled and test switch makes screen go blank. I get three tones with the test switch on then nothing.

EDIT: doh! manual says I have a failing M4 RAM as the 3rd tone is lower than the others
 
Last edited:
I'll go ahead and replace the known faulty ram (which under visual inspection actually looks like it is damaged) and go from there. If I hit a roadblock, I'll shoot road.runner a msg

Thanks
 
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