Just exactly how does this damage occur? While it's not impossible, multisync
types have a PLL that either captures the sync signal and uses it or substitutes
its own if it can't acquire. It's own is well within a safe range, however.
Moreover, the sync rate has nothing at all to do with the question of whether a
monitor's video input is "digital" or not.
The current generation flat-panel displays are clearly out of scope for this
thread, since we're discussing old technology and the context is the question of
whether an EGA/VGA monitor is digital or analog and how one might make it work
with an existing VGA-type card with analog outputs. There are flat panel
displays that take the DE-15 connection ordinarily intended for CRT displays.
Dick
----- Original Message -----
From: "Jeff Hellige" <jhellige_at_earthlink.net>
To: <classiccmp_at_classiccmp.org>
Sent: Thursday, May 10, 2001 2:35 PM
Subject: Re: Converting TTL monitor to Analog
> >What I meant with my remark that it's difficult to do, is that it's
> >difficult to
> >damage a monitor by driving it "all over the map" as you put it. There are
> >monitors that can be damaged by the absence of an appropriate sync signal.
> >Those are fixed-frequency types, however, and they've mostly been damaged
> >already, or they have a home where they are fed the correct signals.
>
> I've certainly seen VGA-type multisync monitors damaged due
> to people trying to push the resolutions up beyond what the monitor
> was meant to do. Today with all the PnP stuff it's not seen as often
> as it was with DOS and the tweaking manually though.
>
>
> >it. I agree, that IF there were such a thing as a digital-input
> >monitor, which
> >may exist, it might take a video signal that's digital in nature. I've said,
> >however, that I've never seen one, and I've had, not hundreds, but, over a
>
> Looking at to references I have here, I see two monitors
> right off the bat that take a TTL signal as input: both the Tandy
> CM-1 and VM-1 monitors, not to mention the current crop of DVI LCD's
> out there.
>
> Jeff
> --
> Collector of Classic Microcomputers and Video Game Systems:
> Home of the TRS-80 Model 2000 FAQ File
> http://www.geocities.com/siliconvalley/lakes/6757
>
>
Received on Thu May 10 2001 - 16:40:04 BST