Re: Help with Overscan

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Article #17864

#17864

From: Van Snyder
Date: Thu, 28 Feb 1991 01:29

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I tried to use pin 2 of the monitor port on an old (rev B) 520 ST, which comes
from pin 10 of the RF modulator, to control Overscan.  It appears not to work.
Is pin 2 not composite sync on old ST's with RF Modulators?  Or is the signal
computed in the Overscan document, by the two diodes and the transistor, not
composite sync?  It seems that the spare NAND in U14 could be used in place of
the two diodes and the transistor (also need to use one of the spare invertors
in U35).  Anybody tried this?  Also, there's ALMOST enough hardware to control
overscan with GPO.  Has anybody tried this?

-- 
vsnyder@jato.Jpl.Nasa.Gov
ames!elroy!jato!vsnyder
vsnyder@jato.uucp

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Message-ID: <1991Feb28.012905.5542@jato.jpl.nasa.gov>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!jato!vsnyder
From: vsnyder@jato.jpl.nasa.gov (Van Snyder)
Newsgroups: comp.sys.atari.st
Subject: Re: Help with Overscan
Message-ID: <1991Feb28.012905.5542@jato.jpl.nasa.gov>
Date: 28 Feb 91 01:29:05 GMT
Reply-To: vsnyder@jato.Jpl.Nasa.Gov (Van Snyder)
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 13