Article View: comp.sys.atari.st
Article #32645Re: Standing Waves (interrupts)
From: Fred Brooks
Date: Mon, 23 May 1988 14:16
Date: Mon, 23 May 1988 14:16
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1355 bytes
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 Lines: 19