Re: Help w/ NEC Multisync 3d and TTL

[Polymorph <polymorph69@hotmail.com>]

On Mar 3, 5:01 am, Steven Hirsch <snhir...@gmail.com> wrote:
> I'm not sure where else to turn for help with this.  I'm trying to use my NEC
> Multisync 3d with a variety of older computers that operate at 15.7khz Horz
> scan frequency - Apple IIgs, Atari ST, Commodore C128, etc.
>
> Unfortunately, I do not have the adapter that NEC offered to convert the
> captive HD15M on the monitor to 9-pin connectors.  I've scratched my head over
> the user manual and a fuzzy copy of the service information and still can't
> make heads or tails out of it.
>
> The service manual lists the following signals as being valid when in TTL
> (EGA/CGA) mode:
>
> RA GND
> r
> R
> g
> V.D
> H.D
> G
> B
> b
>
> So, what is that trying to convey?  The V and H sync are somewhat obvious, as
> are R,G,B.  So, what are the lowercase r,g,b? Inverted polarity?  Different
> levels?
>
> Is "RA GND" just simply ground or is it something else?
>
> Does anyone reading this group have the original adapter?  Are you willing to
> ring out the connections?
>
> If it will help, I can forward PDFs of the pertinent portions of the schematic
> on request.
>

I did a Google search and came up with the following:
http://trs-80.cc/rgb.pdf

At the bottom of this document, it has the pinouts for the Multisync
3D listed.

Hope this helps!

Cheers,
Mike