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From: baxter_a@wehi.dn.mu.oz
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Jittery A3000 Video
Message-ID: <1991Apr5.182219.24542@wehi.dn.mu.oz>
Date: 5 Apr 91 18:22:19 GMT
References: <14760@mcdphx.phx.mcd.mot.com> <20144@cbmvax.commodore.com>  <20300@cbmvax.commodore.com>
Organization: Walter & Eliza Hall Institute
Lines: 20

> 
> I would sugest that you FIRST try the fine tuning adjustment in the
> A3000's user manual because I am fairly sure that it is the fine tuning
> adjustment that is just on the hairy edge of being stable and not having
> any pixel jitter.  This is most often seen at power up when the pixels
> coming out of Denise are not exactly where they are being sampled by the
> display enhancer after the system gets warmer.  You should be able to
> fine several "sweet" spots in the full 15 turn range of the fine tuning
> control where you get no pixel jitter, either cold or warmed up. 
> Please try this and see if it helps your problem.
> 
> Regards,
> Scott Hood

What about this one...

I've seen a 3000 that looks okay through deinterlacer on a VGA monitor,
but in productivity, the screen is shimmering.

Regards Alan