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Article View: comp.sys.atari.st
Article #32645

Re: Standing Waves (interrupts)

#32645
From: Fred Brooks
Date: Mon, 23 May 1988 14:16
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tran@orion.arc.nasa.gov (Andy-Cuong Tran) writes:
>I have a 1040ST.  I notice that whenever I LOAD up a file from the internal
>disk drive or from a ramdisk, diagonal standing waves would appear on my
>Atari SC1224 RGB monitor for a few seconds and then disappear.  Is this the
>norm?  Can this be fixed?  I also notice that certain program causes other
>interference to appear on my monitor.  Whenever I use Dcformat, for example,
>to format diskettes, horizontal standing waves would be visible on the screen
>during the process but would disappear afterwords.  Any comments on the 
>subject matter will be gratefully accepted.  Thank you.


I believe it's caused by the IPL being set to 7 for long periods of time
and not being in sync with H blanking. It looks like something in the video
is not being updated during this time causing the lines. This is just a
guess.

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!bbn!uwmcsd1!marque!gryphon!crash!pnet01!fred
From: fred@pnet01.cts.com (Fred Brooks)
Newsgroups: comp.sys.atari.st
Subject: Re: Standing Waves (interrupts)
Message-ID: <3000@crash.cts.com>
Date: 23 May 88 14:16:11 GMT
Sender: news@crash.cts.com
Organization: People-Net [pnet01], El Cajon CA
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