Asteroid Deluxe logic problem

XY4u

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At first I thought that I had a monitor problem until it displayed the same problem on my spare working CT monitor. These pictures are from test screen and of the ship during play mode. It's funny that the letters, numbers, and asteroids are not affected with this problem just the ship when you are playing a game and obviously the test screen.

I have cleaned and reseated all socketed chips and swapped those that I could with a working Asteroids board that has been modified to be a deluxe. The 5v line on the board is at 5.03v

These boards do not have the BIP, or linearity pots just X and Y size.

How would ou know which DAC was bad if it is?? I don't know what to look at next.
 

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