Asteroids display problem

I've got an Asteroids board with a really bizarre problem:

http://www.synthcom.com/~nb/asteroids.jpg

What you're seeing is the standard test pattern. From what I can gather,
the "Y" stepping is completely OK. However, it looks like every 8 or 16
"pixels" or so, are rounded down, like it has a bit in one of the X
coordinate counters stuck low. When I play the game, all objects look
really strange - like every 8 or 16 "pixels" they're looped back around to
the current 8 or 16 pixel set rather than extending to the adjacent
pixels. This looks to be a "chain link fence" style of problem. Could it
be one of the DACs or ....?

BTW, Does anyone know of a source for these DACs?

I'm curious if A: Anyone has seen this type of problem before, and B: if
I'm looking in the right area for the root problem. Thanks!

-->Neil

-------------------------------------------------------------------------------
Neil Bradley "Why does not knowing Jack require you to know Dick?"
Synthcom Systems, Inc. "One idiot programmer will negate the work of at least
ICQ #29402898 two competent programmers."

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Received on Sat Jun 15 11:23:10 2002