[Coco] is there any existing 6847 output to RGB ? (for coco2)

[didier derny]

When this machine was sold, it was not so common to find a TV with PAL
Most were only SECAM, PAL+SECAM were really expensive

Later PAL+SECAM TV around 1990 where very common



-----Message d'origine-----
De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Luis Antoniosi (CoCoDemus)
Envoyé : jeudi 19 février 2015 21:43
À : CoCoList for Color Computer Enthusiasts
Objet : Re: [Coco] is there any existing 6847 output to RGB ? (for coco2)

It's flip-flop. It must be used to convert the NTSC sync to PAL sync.


Luis Felipe Antoniosi



On Thu, Feb 19, 2015 at 3:36 PM, didier derny <didier at aida.org> wrote:

> The schematics I discovered:  http://6809.eu/schema_alice4k.png
> The mc10 schematics:          http://6809.eu/schema_mc10.png
>
> --
> didier
>
> -----Message d'origine-----
> De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Zippster 
> Envoyé : jeudi 19 février 2015 21:28 À : CoCoList for Color Computer 
> Enthusiasts Objet : Re: [Coco] is there any existing 6847 output to 
> RGB ? (for coco2)
>
> Yes, if it’s just a bunch of transistors (no comparators or adc) then 
> it must be mixing the component signals to RGB while keeping it all analog.
>
> I’m working on one (Digitize —> RGB —> DAC —> VGA) but have a way to 
> go yet.
>
> - Ed
>
>
> > On Feb 19, 2015, at 2:16 PM, Luis Antoniosi (CoCoDemus) <
> retrocanada76 at gmail.com> wrote:
> >
> > Well I do have a coco2 peritel with a RGB output for SCART TVs. It 
> > does everything on transistors, actually a transistor plantation...
> >
> > I think it does a YCbCr -> RGB conversion. The VDG outputs YCbCr.
> >
> >
> > Luis Felipe Antoniosi
> >
> >
> >
> > On Thu, Feb 19, 2015 at 3:04 PM, didier derny <didier at aida.org> wrote:
> >
> >> Is there any existing 6847 output to  rgb board / schematics
> >>
> >>
> >>
> >> I've just seen the pinout of a RGB video connector
> >>
> >> But the video in the machine is done by a 6847
> >>
> >>
> >>
> >> The schematics are hard to read  and there are a lot of transistors
> >>
> >> Between the video signal on the 6847 and the connector.
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> --
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> >> Coco at maltedmedia.com
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> >>
> >
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