11 May
2001
11 May
'01
3:58 p.m.
well, the boxes with intended for multidrop or high-bandwidth serialized
compressed digital video are not on topic for this thread. We're trying to
establish whether there really are digital interfaces to the old (get
it...classic computers... over 10-years old ... using interfaces of that era)
monitors associated with the PC's and MAC's of the EGA era. The use of
sufficient logic or intelligence to manage lossless compression at the monitor
end was not a reality back in the '80's.
I suspect that there's a significant mismatch between this technology and the
PC's of the '80's, with which these TTL or analog monitors under discussion
go.
See below, plz.
Dick
----- Original Message -----
From: "Davison, Lee" <Lee.Davison(a)merlincommunications.com>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, May 11, 2001 9:51 AM
Subject: RE: Converting TTL monitor to Analog
If it's serialized then it's really moving along! if you've got 1K
pixels at a
nominally 65 MHz pixel rate with 24 bits per pixel ... I assume the
designers at
least use three channels, one for each color, so as to reduce that
to 8 bits per
pixel, right?
Use lossless compression, then even hires displays rarely get over 20Mb/s
For most applications, the distance from the "box" to the display
isn't far at
all, but I can see the benefit where a large display might be
desirable, as in a
classroom or demonstration environment.
Or multi drop.
Nevertheless, aside from relatively small signal losses, there isn't
a big
advantage, aside from the fact that every display manufacturer can
process the
signal however he prefers.
Cheaper connectors, cheaper cable, no mismatch artifacts...
yes, but not in the market where that price difference would show up next to the
$10k per monitor for the intelligence required to manage the compression and the
DAC's to handle the bandwidth, plus the support logic.
What sort of connector is used for the serialized digital
arrangement?
BNC mostly.
So you'be suggesting 5 bnc's? three for video and two for sync signals?
Lee.
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