[Coco] Help with RGB cable

[coco at yourdvd.net]

No problem - I joined this list seeking help finding documentation, and
if I can provide any help to anyone (you fine folks really came through
for me), then I shall do so. I would definately trust Robert Gaults
advice over mine though. About the 1084 - If I remember correctly,
commodore monitors were made by Magnavox. I have repaired several in
the past that had cold solder joints due to heat build up, so it is
important to use the stand under the front of the monitor to lift it up
and allow circulation. If a mag/commodore monitor exibits flaky
behavior, such as sometimes the screen just goes black, then it may be
suffering from cold solder joints. However, attempting the repair can
be dangerous, as there are lethal voltages inside. -r

> -------- Original Message --------
> Subject: Re: [Coco] Help with RGB cable
> From: "Marcus Vinicius Garrett Chiado" <marcus.chiado at gmail.com>
> Date: Mon, March 26, 2007 5:59 am
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> 
> Thank you very much, Rob. I recently bought a *real* 1084S (a D-II
> model) and will try to use my actual cable with it for it has
> composite sync already. As soon as I pick the monitor up, I will let
> you know.
> 
> :-D
> 
> 
> 
> 2007/3/26, coco at yourdvd.net :
> > Unless I am mistaken, The Apple II GS monitor requires a composite sync
> > while the coco 3 outputs individual horizontal and vertical sync. You
> > can generate this by using a 74LS02. Connect the CoCo's H and V syncs
> > to the inputs of one of the NOR gates. The output of that gate becomes
> > negative composite sync. Run that into both inputs of another NOR gate
> > and the output of that gate becomes postive composite sync. Connect the
> > inputs of the other two unused gates to ground and leave their outputs
> > open. You can draw power for the NOR gates from the joystick port, or a
> > battery with a 5v regulator or a 5v wal-wart, etc.
> >
> > IF YOU NEED A SCHEMATIC, LET ME KNOW, I CAN EMAIL IT TO YOU.
> >
> > ROB
> 
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