Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!ames!purdue!decwrl!sun!imagen!atari!apratt
From: apratt@atari.UUCP (Allan Pratt)
Newsgroups: comp.sys.atari.st
Subject: Re: Screen Saver
Keywords: Vsync VBL-Queue
Message-ID: <1469@atari.UUCP>
Date: 1 May 89 20:45:36 GMT
References: <1040@gmdzi.UUCP>
Reply-To: apratt@atari.UUCP (Allan Pratt)
Organization: Atari (US) Corporation, Sunnyvale, California
Lines: 25

In article <1040@gmdzi.UUCP> kloppen@gmdzi.UUCP (Jelske Kloppenburg) writes:
> I just wrote a Screen Saver Program for a friend. I used the trick to
> set the Vsync to external Signal. While testing I realized, that with
> Screen off (= no sync signal) the VBL Queue routines are not executed.
> Is that right?
> 
>       Kloppenburg@kmx.gmd.dbp.de
> UUCP: kloppen@gmdzi


I'm not sure I understand your description, but if you're programming
the shifter to take Vsync from an external source, and there is no
external source, you can actually case MORE damage to your monitor
than leaving it on.  Monochrome monitors in particular don't like
being turned on without any synch information: they make a noise
like they're in pain, if your ears can pick it up.

Here's a good chance to say NEVER LEAVE YOUR ATARI MONOCHROME MONITOR ON
(for long) AFTER TURNING OFF YOUR COMPUTER.  A minute or two is fine,
but over the course of hours something gets hot inside and eventually
your monitor dies.

============================================
Opinions expressed above do not necessarily	-- Allan Pratt, Atari Corp.
reflect those of Atari Corp. or anyone else.	  ...ames!atari!apratt