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From: hyc@math.lsa.umich.edu (Howard Chu)
Newsgroups: comp.sys.atari.st,comp.sys.atari.st.tech
Subject: Re: STe troubles, video weirdness
Message-ID: <1990Nov25.005225.20937@math.lsa.umich.edu>
Date: 25 Nov 90 00:52:25 GMT
References: <1990Nov20.085041.25605@math.lsa.umich.edu> <1751@mwca.UUCP>
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Organization: University of Michigan Math Dept., Ann Arbor
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In article <1751@mwca.UUCP> bill@mwca.UUCP (Bill Sheppard) writes:
>I've seen the same thing (with the double mono screen - a cheap two-page
>monitor!) This happened when I was using a multisync in mono mode - overnight
>I turn off the monitor but leave the ST on - when I came in the next morning
>and turned on the monitor I saw what you describe. I suspect it has something
>to do with the synchronizing circuitry in the monitor becoming confused (in
>my case, when I turned on the monitor with the ST already on). Perhaps your
>ICD driver/STe is pulsing the horizontal sync in such a way that the monitor
>gets confused...

Well, I've seen it in low-rez mode now, too. In mono, what happens is the
video shifter gets set to medium rez, but lineA, VDI, AES, etc., aren't
notified of any change. From low-rez mode, you get the same vertical
division of the screen, only this time, the right half is black. It's really
strange, I didn't think the way memory was mapped would allow something
coherent to be displayed when modes shifted like this, but there's no
scrambling at all.
--
  -- Howard Chu @ University of Michigan

Mac// - adv., q.v. MacToo, e.g.  McHave a McHappy McDay!
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