space invaders has horizontal lines through invaders...

learpilot2

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space invaders has horizontal lines through invaders...

When I power on my space invaders, it draws one thin horizontal line through each row of space invaders (7 horizontal lines total). When I fire at them, the bullet hits the lines and not the invader. Some times the bullets knock a hole in the thin horizontal line, and the next shot kills the invader.

I also noticed the invaders advance down 2 levels normally, and then advance straight down quickly and the game ends. Not sure if the problems are related.

I re-seated all roms
I re-seated and cleaned all edge connectors
I beat on it also
no change
 
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