[Coco] RGB cable for Samsung SyncMaster 711mp

[mike delyea]

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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