19 Jan
2019
19 Jan
'19
1:57 p.m.
Greetings,
I'm trying to find a way to get my DEC Rainbow's monochrome output onto a
newer monitor than my aging VR201 (especially since I zapped something in
it and my diagnostic efforts to date haven't fixed it).
So, I found the bit in the Rainbow docs that said the output was DC Coupled
RS-170 signals and to convert to RS-170 (NTSC black and white) I needed to
put a 10uF cap inline to make it RS-170. So I did this, and fed it into a
generic NTSC composite video to VGA thing, and got only a little joy. The
first few lines seem to be missing, then the next few are OK and then
nothing else.
I tried to google this, but found nothing. My google foo has failed me.
Does anybody else have a working setup?
Warner
19 Jan
19 Jan
4:38 p.m.
On Jan 19, 2019, at 1:57 PM, Warner Losh via cctalk
<cctalk at classiccmp.org> wrote:
Greetings,
I'm trying to find a way to get my DEC Rainbow's monochrome output onto a
newer monitor than my aging VR201 (especially since I zapped something in
it and my diagnostic efforts to date haven't fixed it).
So, I found the bit in the Rainbow docs that said the output was DC Coupled
RS-170 signals and to convert to RS-170 (NTSC black and white) I needed to
put a 10uF cap inline to make it RS-170. So I did this, and fed it into a
generic NTSC composite video to VGA thing, and got only a little joy. The
first few lines seem to be missing, then the next few are OK and then
nothing else.
I'd be interested in the answer also, for my Pro.
What device do you use for NTSC to VGA conversion?
paul
6:51 p.m.
On Sat, Jan 19, 2019 at 2:38 PM Paul Koning <paulkoning at comcast.net> wrote:
I'm using
https://www.amazon.com/gp/product/B00M4JY722/ref=oh_aui_search_asin_title?i…
and it's the one that's not working. Look to be dozens of clones of this
though.. My NTSC camera works with it..
Warner
On Jan 19, 2019, at 1:57 PM, Warner Losh via
cctalk <
cctalk at classiccmp.org> wrote:
Greetings,
I'm trying to find a way to get my DEC Rainbow's monochrome output onto a
newer monitor than my aging VR201 (especially since I zapped something in
it and my diagnostic efforts to date haven't fixed it).
So, I found the bit in the Rainbow docs that said the output was DC
Coupled
RS-170 signals and to convert to RS-170 (NTSC
black and white) I needed
to
put a 10uF cap inline to make it RS-170. So I did
this, and fed it into a
generic NTSC composite video to VGA thing, and got only a little joy. The
first few lines seem to be missing, then the next few are OK and then
nothing else.
I'd be interested in the answer also, for my Pro.
What device do you use for NTSC to VGA conversion?
28 Dec
28 Dec
2:57 p.m.
On Jan 19, 2019, at 4:38 PM, Paul Koning
<paulkoning at comcast.net> wrote:
Digging in old email...
I've looked at this some more the other day. Two observations.
1. The "mono" video output from the Pro is a valid composite video signal, no
surprise there.
2. For color signals, the approach I'm going to try in the near future is to convert
to "component video". That's a trivial analog process, see
https://www.analog.com/en/design-center/reference-designs/circuit-collectio…
for example.
The reason this seems like a good approach is that component video inputs of typical TV
sets support "480i" signals, which is what the Pro produces. Contrast that with
VGA, which is effectively 480p (no interlace, 2x the horizontal frequency) so producing
that is a much harder job.
If you can change the color mapping, you could even just feed an RGB signal directly to a
component video input, with G going to Y (assuming you have sync on green) and R/B going
to Pr/Pb with a bias in the color map entries to make the result right. Haven't tried
that either.
paul
On Jan 19, 2019, at 1:57 PM, Warner Losh via
cctalk <cctalk at classiccmp.org> wrote:
Greetings,
I'm trying to find a way to get my DEC Rainbow's monochrome output onto a
newer monitor than my aging VR201 (especially since I zapped something in
it and my diagnostic efforts to date haven't fixed it).
...
I'd be interested in the answer also, for my Pro. 
20 Jan
20 Jan
8:43 p.m.
I have a few VR201 boards I might let loose. I don't want to sell any
monitors until I fell off the DECMATES , Rainbows, and Pros.
Paul
On Sat, Jan 19, 2019 at 12:57 PM Warner Losh via cctalk <
cctalk at classiccmp.org> wrote:
Greetings,
I'm trying to find a way to get my DEC Rainbow's monochrome output onto a
newer monitor than my aging VR201 (especially since I zapped something in
it and my diagnostic efforts to date haven't fixed it).
So, I found the bit in the Rainbow docs that said the output was DC Coupled
RS-170 signals and to convert to RS-170 (NTSC black and white) I needed to
put a 10uF cap inline to make it RS-170. So I did this, and fed it into a
generic NTSC composite video to VGA thing, and got only a little joy. The
first few lines seem to be missing, then the next few are OK and then
nothing else.
I tried to google this, but found nothing. My google foo has failed me.
Does anybody else have a working setup?
Warner
1741
days inactive
2084
days old
4 comments
3 participants
participants (3)
-
imp＠bsdimp.com -
paulkoning＠comcast.net -
useddec＠gmail.com