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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: *standard* VGA sync levels ?
Date: Mon, 2 Dec 2002 12:08:41 +0100
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John Jardine a écrit dans le message :
> fred bartoli wrote in message
> > Hello,
> > The fire brigade (I) have to design some protective device (will be a
> > of dongle) that will be insterted between the video output and the
> > cable to prevent a badly designed video output (our nice work) to
> > latchup in fields (about 5% every two weeks... eh eh, not so bad).
> > I'm OK with the RGB lines (levels are low) but the HSYNC and VSYNC
> > are typically 5V levels and I *have* to be ensure clamping under the
> > VCC level (the chip seems pretty sensitive and have no specs) which
> > room at all if taken abruptly.
> > So I need the minimum *standard defined* level a video card has to put
> > sync signals.
> > (didn't manage to find anything useful outof google)
> > Anyone has a pointer or the values on top of his hat ?
> > thanks,
> > Fred.
> Had a bit of trouble figuring the question ;-).
> (thought VGA was -all- logic levels.
> There's little VGA info out there but I found this a few weeks ago from
> epanorama.net. Don't know if it's relevant ...
< Deleted some stuff from epanorama>
Maybe I should have have made it more clear (see my answer to Ian) but I'm
all but a PC related digital stuff design guy. In clear, almost all I knew
is that a VGA (or what ever todays standard is called) plug is a HDE15
(thanks Michael) plug, and now that the video levels are 0.7V nom.
However, the first VGA video cards I remember were 16 colors, so I don't
think the video colors were logicl levels (only 8 colors). I rather think
the all digital was the CGA standard (only 8 colors), but maybe I'm wrong on
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