[Coco] RGB cable for Samsung SyncMaster 711mp

[Ken H.]

I've done the conversion externally as you suggested a while ago.   The
ls02 is attached to the scart cable, with a 12v power supply and an LM7805
for 5v. The coco isn't modified.

On Friday, April 11, 2014, Retro Canada <retrocanada76 at gmail.com> wrote:

> did you disable the pin 10 before?
> you need to open two resistors on coco3.
>
> opposite to what the doc says the pin 10 is in use.
>
> i have sent a web page translated from portuguese. search for victor
> trucco coco3. there you will find which resistors to pull.
>
> On Apr 10, 2014, at 5:04 PM, "Ken H." <dragon.atv at gmail.com> wrote:
>
> Just checked again and SCART pin 20 is connected to the 74ls02 pin 10 which
> is the CSYNC.
> If your diagnosis the composite sync issues I'll do more testing there.  I
> was worried that this monitor may not support 15khz after all.
>
>
> On Thu, Apr 10, 2014 at 11:31 PM, Luis Antoniosi (CoCoDemus) <
> retrocanada76 at gmail.com> wrote:
>
> > In your video you are clearly missing composite sync. I bet you wired
> > it to the wrong pin.
> >
> >
> >> On Thu, Apr 10, 2014 at 4:22 PM, Ken H. <dragon.atv at gmail.com> wrote:
> >> I have built a Coco3 RGB to SCART cable for my Samsung SyncMaster 711mp
> >> monitor but the image is jumping around.  You can see it in this short
> >> video here: http://youtu.be/5Jm2T_HyK5E
> >> What's wrong? Is the Sync signal wrong or perhaps this monitor doesn't
> >> support 15khz RGB? (although I believe it should)
> >> I have used a 74ls02 to create the composite sync.  Scart Pin 8 has 12
> > volt
> >> and pin 16 measures about 5v.
> >> Can you tell what's the problem based on how this image looks?
> >> thanks
> >> Ken
> >>
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