On Mon, Mar 19, 2018 at 12:39 PM, Ethan Dicks via cctalk < cctalk@classiccmp.org> wrote:
> On Mon, Mar 19, 2018 at 2:18 PM, Alan Frisbie <flash...@flying-disk.com> > wrote: > > Ethan Dicks <ethan.di...@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... > > > > 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. > > 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 > 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. Warner