VECTOR: Aseroids tech question

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Newsgroups gmane.games.arcade.vector
Message-ID <[email protected]> 
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.  
 
Matt Fisher
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