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

[didier derny]

I found the schematics, of the matra alice. Almost a clone of the mc10 except for the video
Where the modulator is effectively replaced by a "forest" of transistors

-  13  transistors...
-  1   buffer or inverter 
-  1   unlabeled chip combining  clk + HS  + FS + another unknown signal (I guess to produce the synchro)



-----Message d'origine-----
De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Luis Antoniosi (CoCoDemus)
Envoyé : jeudi 19 février 2015 21:16
À : CoCoList for Color Computer Enthusiasts
Objet : Re: [Coco] is there any existing 6847 output to RGB ? (for coco2)

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
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> I've just seen the pinout of a RGB video connector
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> But the video in the machine is done by a 6847
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> The schematics are hard to read  and there are a lot of transistors
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> Between the video signal on the 6847 and the connector.
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