I know the dig dug is fine as it works fine in other systems. Haven't tried those other games, but most 2600 games work fine just cant understand what could be broken on the system to cause the video to be unstable. Its only unstable when I move dig dug around and then the video jerks up and down also the sprites glitch into walls. I know its not the TIA, RIOT, or Ram. Could the Maria chip the issue with a 2600 game? Caps and voltage regulator were replaced too.