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Museum of the Game® & International Arcade Museum® Forums
I have a Battlezone with jumpy vectors on the X axis. Here's a video:
This seems to only happen in game, not test. The only problems I see in test are a short edge on the left side, and maybe slightly messed up copyright symbols? In game, most things have bad X coordinates - the moon, horizon, crosshairs, rader, etc. It's like it's missing a bit in the X resolution.
I've tested all the ROMs, RAM, and swapped out the aux board. No errors in test. I've written some short programs to test the vector generator, and can't reproduce it myself.
Any ideas what's causing this, or things to check next? It's strange this is only in game, and the test screen doesn't seem to reproduce it.