[Coco] RGB cable for Samsung SyncMaster 711mp

[Retro Canada]

your samsung is way better than mine

On Apr 12, 2014, at 2:36 AM, "Ken H." <dragon.atv at gmail.com> wrote:

Here are the pics 'by popular demand'.
https://www.flickr.com/photos/123022373@N05/sets/72157643828503883/
The background pixelation isn't visible to the eye, it's just on camera.

The last two pictures are my "before" pictures, using Roy's VGA adapter on
the same monitor.
Roy's adapter produces nice image, but RGB is better.
The only issue I have is that with RGB the image isn't centered but flushed
to the left.  The monitor doesn't have any position adjustments for RGB.
Is there any way to adjust it?
Ken


> On Sat, Apr 12, 2014 at 4:39 AM, mike delyea <mdelyea at gmail.com> wrote:
> 
> Yes, pics or it didn't happen.  (sorry for that meme)
> 
> 
> On Fri, Apr 11, 2014 at 7:29 PM, Retro Canada <retrocanada76 at gmail.com
>> wrote:
> 
>> congrats, told you need a resistor ;)
>> 
>> could you take a photo or a video to conpare the quality? specially with
>> 80 column modes?
>> 
>> although my 730mw is ok with 80 columns i dont consider it as optimal
>> 
>> On Apr 11, 2014, at 6:30 PM, "Ken H." <dragon.atv at gmail.com> wrote:
>> 
>> It's working!!
>> I now have a perfect RGB image with the Coco3 and Samsung 711mp!
>> Thanks Luis and Steve for your suggestions.
>> My problem was with resistor values or improper grounding.
>> 
>> For anyone else who'd like to do it externally (w/o the internal Coco
> mod),
>> here are my connections:
>> CoCo RGB  ---------->   SCART
>> 1,2 + 12v(-)   --->  4,17,21       Ground
>> 3                           ----> 15        Red
>> 4                           ----> 11        Green
>> 5                           ----> 7          Blue
>> 7                           -----> 2,6      Audio
>> 8 ---> 74ls02 pin 8                    HSync
>> 9 ---> 74ls02 pin 9                    VSync
>> 74ls02 pin 10      ------> 20        CSync
>> 12V(+) ---> LM7805 pin 1 ,  SCART pin 8
>> 12V(-)  ---> LM7805 pin 2, 74ls02 pin 7   Ground
>> LM7805 pin 3 ----> 74ls02 pin 14        VCC 5v
>> 510ohm resistor between SCART pins 8 and 16
>> 
>> Ken
>> 
>> 
>> 
>>>> On Fri, Apr 11, 2014 at 2:49 PM, Steven Hirsch <snhirsch at gmail.com>
>>> wrote:
>>> 
>>> On Thu, 10 Apr 2014, Luis Antoniosi (CoCoDemus) wrote:
>>> 
>>> I have to look my cable but I think I followed this:L
>>>> 
>>>> http://img362.imageshack.us/img362/428/rgbanemoser7.jpg
>>>> 
>>>> Are you sending the CSync on pin 20 ?
>>>> 
>>>> The resistor is needed as well.
>>> 
>>> There are two voltage-controlled pins in the SCART standard:
>>> 
>>> Pin 8 --> 0-2V = TV Mode
>>>         5-8V = Wide screen
>>>         9.5V-12V = AV Mode (aka external input)
>>> 
>>> (You want AV mode)
>>> 
>>> Pin 16 --> 0-0.4V = Composite video
>>>          1-3V = RGB video
>>> 
>>> (You want RGB)
>>> 
>>> Not all displays fully implement this, but several of my units here do
>>> require that both lines be conditioned appropriately.
>>> 
>>> Steve
>>> 
>>> 
>>> --
>>> 
>>> 
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>> 
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