10 May
2001
10 May
'01
9:40 a.m.
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(a)earthlink.net>
To: <classiccmp(a)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
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