19 Mar
2018
19 Mar
'18
2:18 p.m.
Ethan Dicks <ethan.dicks at gmail.com> wrote:
I don't happen to have a VR201 here right now to
measure directly (or
I would just do that), but IIRC, there's a threaded mounting insert on
the bottom (for the "E.T. Stand", if nothing else), I want to
fabricate a shelf clip for a VR201 and am seeking the diameter/thread
pitch for the insert. Does anyone have that info handy? It's likely
larger than 1/4-20 from what I remember.
There are four brass inserts in a trapezoidal pattern, each threaded
1/4-20 (National Coarse). The trapezoid is 7.0" center-to-center
for the two nearest the screen, and the rear ones are 5.0" center-to-center.
It is 5.0" between the front (screen) pair and the rear pair.
This is for a VR201-B -- other dash-variants may be different.
If there is a base with a single large threaded insert, it may be
an adapter that goes between the VR201 and the stand.
Now, could someone please tell me the pinouts for the 15-pin connector?
I would like to use it to view RS-170 video, if possible.
Alan Frisbie
19 Mar
19 Mar
2:33 p.m.
On Mar 19, 2018, at 2:18 PM, Alan Frisbie via cctalk
<cctalk at classiccmp.org> wrote:
...
Now, could someone please tell me the pinouts for the 15-pin connector?
I would like to use it to view RS-170 video, if possible.
It's spelled out in fair detail in the Pro 300 Technical Manual, on Bitsavers. Look
at volume 1, page 383 (8-5). There are also VT201 engineering drawings on Bitsavers.
One complication is that you have to supply +12v power; the VT201 is powered from the
system box. The video is standard monochrome composite video "compatible with EIA
RS170 standards". So yes, that should work for what you want to do.
paul
2:39 p.m.
On Mon, Mar 19, 2018 at 2:18 PM, Alan Frisbie <Flash688 at flying-disk.com> wrote:
Ethan Dicks <ethan.dicks at gmail.com> wrote:
Perfect. Thanks, Alan!
I don't happen to have a VR201 here right now
to measure directly (or
I would just do that), but IIRC, there's a threaded mounting insert on
the bottom...
There are four brass inserts in a trapezoidal pattern, each threaded
1/4-20 (National Coarse). The trapezoid is 7.0" center-to-center
for the two nearest the screen, and the rear ones are 5.0" center-to-center.
It is 5.0" between the front (screen) pair and the rear pair. Now, could someone please tell me the pinouts for the
15-pin connector?
I would like to use it to view RS-170 video, if possible.
From the Rainbow pinout...
http://www.larosse.net/pc100/dec100-vr201-cable.html
... I think the VR201 certainly matches the subset of that. I don't
know if the color pins are N.C. on thje VR201 (but I would hope so),
but I have wired up a DA15 cable to tap +12V from an Amiga 2000 and
display mono video from its mono composite output...
4 | Mono shield ground | Shield ground for composite video
coaxial cable
5,6 | Ground | Video, data, and power ground
7,8 | +12 V | + 12 V power to monitor and keyboard
12 | Mono video | Composite B/W video from the
video processor on the system module
13 | No Connection | Not used
14 | Keyboard received data | KBD RXD Serial data transmitted
(output) to keyboard
15 | Keyboard transmitted | KBD TXD Serial data received data
(input) from keyboard
-ethan
3:05 p.m.
On Mon, Mar 19, 2018 at 12:39 PM, Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:
On Mon, Mar 19, 2018 at 2:18 PM, Alan Frisbie
<Flash688 at flying-disk.com>
wrote:
For the Rainbow (and I think the Pro to), there's a DC coupling that's not
normal that needs to be removed with a series capacitor:
Ethan Dicks <ethan.dicks at gmail.com>
wrote:
center-to-center.
I don't happen to have a VR201 here right now
to measure directly (or
I would just do that), but IIRC, there's a threaded mounting insert on
the bottom...
There are four brass inserts in a trapezoidal pattern, each threaded
1/4-20 (National Coarse). The trapezoid is 7.0" center-to-center
for the two nearest the screen, and the rear ones are 5.0" It is 5.0" between the front (screen) pair
and the rear pair.
Perfect. Thanks, Alan!
Now, could someone please tell me the pinouts for
the 15-pin connector?
I would like to use it to view RS-170 video, if possible.
From the Rainbow pinout...
http://www.larosse.net/pc100/dec100-vr201-cable.html
... I think the VR201 certainly matches the subset of that. I don't
know if the color pins are N.C. on thje VR201 (but I would hope so),
but I have wired up a DA15 cable to tap +12V from an Amiga 2000 and
display mono video from its mono composite output...
4 | Mono shield ground | Shield ground for composite video
coaxial cable
5,6 | Ground | Video, data, and power ground
7,8 | +12 V | + 12 V power to monitor and
keyboard
12 | Mono video | Composite B/W video from the
video processor on the system module
13 | No Connection | Not used
14 | Keyboard received data | KBD RXD Serial data transmitted
(output) to keyboard
15 | Keyboard transmitted | KBD TXD Serial data received data
(input) from keyboard
From 3.5.3 Keyboard/Monitor Connector (J3) Signals of
The Rainbow 100
Technical Manual (EK-PC100-TM):
Video signals - Similar to EIA RS-170
*NOTE*
*The composite video (Mono Video) signal on pin 12 is dc coupled and
therefore not in strict agreement with RS-170. To agree with RS-170, the
composite video signal would require a 10 microfarad capacitor in series
with the output. *
I have all the parts needed to drive a modern LCD monitor using the Video
Camera to VGA adapter things, but haven't yet had the time to try it out.
Warner
4:34 p.m.
On Mar 19, 2018, at 3:05 PM, Warner Losh via cctalk
<cctalk at classiccmp.org> wrote:
...
For the Rainbow (and I think the Pro to), there's a DC coupling that's not
normal that needs to be removed with a series capacitor:
From 3.5.3 Keyboard/Monitor Connector (J3) Signals of The Rainbow 100
Technical Manual (EK-PC100-TM):
Video signals - Similar to EIA RS-170
*NOTE*
*The composite video (Mono Video) signal on pin 12 is dc coupled and
therefore not in strict agreement with RS-170. To agree with RS-170, the
composite video signal would require a 10 microfarad capacitor in series
with the output. *
I have all the parts needed to drive a modern LCD monitor using the Video
Camera to VGA adapter things, but haven't yet had the time to try it out.
Yes, the Pro manual also mentions that it's DC coupled.
That probably makes sense, given that computer graphics are likely to have long stretches
of constant output, unlike TV type video. Unless the DC coupling causes problems it would
make sense to leave it alone.
paul
2282
days inactive
2282
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4 comments
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participants (4)
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ethan.dicks＠gmail.com -
Flash688＠flying-disk.com -
imp＠bsdimp.com -
paulkoning＠comcast.net