19 Mar
2018
19 Mar
'18
12:05 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