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

[Louis Ciotti]

If you follow pins 33,37,38 they go right to the transistor "nest" so this
board definitely handling the sync/clock differently.

On Thu, Feb 19, 2015 at 5:23 PM, Zippster <zippster278 at gmail.com> wrote:

> Or Z19 or Z21.  This one apparently doesn’t do the same clock
> manipulations.
>
> Interesting.  Wish there was a schematic for this one.
>
> - Ed
>
> > On Feb 19, 2015, at 3:54 PM, didier derny <didier at aida.org> wrote:
> >
> > I found this photographs.... http://alice.system-cfg.com/alice.php
> > But I don’t see Z20...
> >
> >
> > -----Message d'origine-----
> > De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Zippster
> > Envoyé : jeudi 19 février 2015 22:13
> > À : CoCoList for Color Computer Enthusiasts
> > Objet : Re: [Coco] is there any existing 6847 output to RGB ? (for coco2)
> >
> > Probably "close enough”.  Does it say anywhere in the files you found
> what ic Z20 is?
> > Weird way to run a clock to the 6847.
> >
> > - Ed
> >
> >
> >> On Feb 19, 2015, at 3:02 PM, didier derny <didier at aida.org> wrote:
> >>
> >> Btw apparently on the alice the clock is not 3.5795... but 3.55
> >>
> >> -----Message d'origine-----
> >> De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Zippster
> >> Envoyé : jeudi 19 février 2015 21:54 À : CoCoList for Color Computer
> >> Enthusiasts Objet : Re: [Coco] is there any existing 6847 output to
> >> RGB ? (for coco2)
> >>
> >> Not familiar with the SECAM standard, but the flip-flop is clearly used
> to adjust the sync.
> >>
> >> - Ed
> >>
> >>
> >>> On Feb 19, 2015, at 2:50 PM, didier derny <didier at aida.org> wrote:
> >>>
> >>> 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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> >>>>>>
> >>>>>
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> >>>
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> >>
> >>
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