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

[didier derny]

The schematics I discovered:  http://6809.eu/schema_alice4k.png
The mc10 schematics:          http://6809.eu/schema_mc10.png

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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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>> 
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>> 
>> 
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