Re: Help w/ NEC Multisync 3d and TTL

[scott@alfter.DIESPAMMERSDIE.us (Scott Alfter)]

In article <pu2dnUi-3MUZdlfanZ2dnUVZ_vGinZ2d@giganews.com>,
Steven Hirsch  <snhirsch@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?

r, g, and b would be the low bit for each component in EGA mode.  g should
serve double duty as the intensity signal for CGA mode.

I don't have the CGA/EGA adapter either (haven't needed it as my IIGS uses
the Mac adapter and I've installed a VGA card in my PC/XT to replace the CGA
card and monitor that came with it), but the pinouts listed below should
work:

http://pinouts.ru/Video/CGA_pinout.shtml
http://pinouts.ru/Video/EGA_pinout.shtml

I think some of the front-panel switches on the monitor might also need to
be flipped to enable EGA or CGA usage.  Since I've only used mine for VGA
and analog RGB, I can't confirm this directly.

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