[Coco] RGB cable for Samsung SyncMaster 711mp

[Retro Canada]

i think the pin 16 needs a Zener diode.

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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> 
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