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From: schuch@efes.physik.uni-kl.de (Andreas Schuch)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: *** HELP!  Annoying Verticle line screen garbage! ***
Keywords: atari-st monitor
Message-ID: <1991Apr29.163055.7126@rhrk.uni-kl.de>
Date: 29 Apr 91 16:30:55 GMT
References: <1970@ahds.UUCP> <47867@ut-emx.uucp>
Sender: news@rhrk.uni-kl.de
Reply-To: schuch@efes.physik.uni-kl.de (Andreas Schuch)
Organization: University of Kaiserslautern (Germany)
Lines: 50


sean@ccwf.cc.utexas.edu (Sean Sterling Foiles) writes:
>OK, here's the story so far:
>
>Occasionally my ST Color Monitor SC1224 fills up with vericle lines along
>the left side of every other character column.  In lo rez that means 20
>verticle lines, in med rez it's 40. 
>...

I have similiar problems with my ST 520+ (TOS 1.4, but also with 1.0)
and mono  monitor SM124 with any configuration of auto-prgs or accs.

From time to time 8 black vertical black stripes appear on the screen
hiding  parts of the display. The stripes go from top to bottom. Each
stripe has a width  of 2 characters (16 pixels), the space between is 8
chars, the first stripe is  after 6 (sometimes after 2 chars) and the
last one is at the right border of the screen. The missing chars of the
right border appear at the left border of the screen with one pixel
shifted vertically down. Quite strange, isn't it?

For example


   This is at the left border ....     This is at the right border


displays like:

           ||        ||        ||           ||        ||        ||
   erThis i||at the l||t border||...     Thi||is at th||right bo||
           ||        ||        ||           ||        ||        ||



This effect occasionally comes out when:
 - starting or finishing TEMPUS,
 - ViewGIF displays a picture,
 - SysMon is invoked,
 - tracing over certain TRAPs with MonST debugger (couldn't find out
which in special).

I have never seen these stripes when connecting my TV as color monitor
to my ST, but I
don't use color mode often.
Normally only rebooting helps to get rid of the stripes. Sometimes the
responsible programs restore a stripped screen again, but in this case,
sometimes the chars from right remain at the left side.

Any suggestions?
Thanks in advance.