Joust Graphics Glitch

Zud

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I have an issue with my Joust. It has some graphic glitches that appear at times. But if you fly over the glitches they will disappear. Any thoughts before I pull the chips and reseat them??
 

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That is usually an indication of problems with the RAM, even if you're not currently getting RAM errors. Sometimes a simple chip leg cleaning of all 24 RAM chips will fix it. I'd recommend doing the 4164 RAM upgrade to it though.

Also, sometimes you can get stuff like this if you have a problem with the ribbon cable from the ROM board, but that is less common...
 
BTW - not only is your blue drive turned up too high on your monitor, it appears your blue convergence is off, too....
 
+1 on the convergence. I'd try the RAM, but I wouldn't expect it to fix the problems. Pic #2 is a clear example of convergence issues. You probably bumped the nexk or moved the cabinet. A good degaussing might help a liitle alse.

ken
 
I have an issue with my Joust. It has some graphic glitches that appear at times. But if you fly over the glitches they will disappear. Any thoughts before I pull the chips and reseat them??

Pixel's being 'left behind' like that is often, but not exclusively, the SC01's on the ROM board.

Just re-seat the two of them, they're the two socketed 40 pin IC's on the ROM board. It's also worth re-seating the ROM to CPU board connector.

- James
 
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