Hey all. My Asteroids has developed a horizontal line across the screen over which the objects "jump." This also shows up on the test screen as "stretching" in the cross-hatch pattern. I read on an Asteroids troubleshooting site that this may be related to a D/A converter. Is this an easy fix? Are the parts readily available? Thanks in advance for any help.
It could be a bad DAC, or a bad counter driving it, or a bad op-amp following the DAC. The DAC is by far the most expensive chip, and the hardest to get replacements for. If you're soldering-savvy, you can isolate the problem by desoldering both DACs and swap them. If this "invisible line" changes axes (from X to Y), then you've nailed it. Swapping the op-amp chips works this way, too.
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Received on Mon Nov 29 19:11:16 2004
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