Centipede Issue

hockeyman44

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What causes the missing pixels in the shooter, points(for killing spider) and spider in the attached pics. Also cause the centipede to have a line in the middle of it, but only on certain lines on the bottom half of the screen.

I have tried reseating all the socketed chips
I have tried swapping all the socketed chips
I have tried piggybacking all of the 2101 and 2114 RAMs

Any other ideas?

Thanks,
Todd
 

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What causes the missing pixels in the shooter, points(for killing spider) and spider in the attached pics. Also cause the centipede to have a line in the middle of it, but only on certain lines on the bottom half of the screen.

Purely guessing here, but maybe a line stuck low (or high) on any of the stuff on Sheet 2 (motion object or picture data ROM) sections of the schematic... Your ROM and RAM are probably fine, but the circuitry that turns them into pixels into video RAM is zeroing out all the pixels on some of the various sprites/MOBs.
 
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