Galaga graphics issues

mikeatsparkys

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Just scooped a Galaga to swap into my Mappy cocktail. Put it in and seemed to work fine except for some graphics issues on the moving bits. See pics. Any obvious reasons why this would occur?

Mappy plays perfect. Sorry for such a seemingly basic Q.
 

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There's a ground lead that connects to the Mappy board but I don't see a place for it on Galaga. Maybe I'm missing something?
 
There's a ground lead that connects to the Mappy board but I don't see a place for it on Galaga. Maybe I'm missing something?

clean the edge connector and maybe bump up the voltage to 5.15, other than than might be ram chip going bad. Re seat the ribbon cable a time or two might clear it up.
 
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