[Coco] S-Video mod for Coco1

[Ken H.]

Luis, your bet on pin 13 of the LM1889 is right on target!

The ZX Spectrum also has the LM1889 (IC14) and pin 13 is indeed used for
its s-video mod:  http://www.retrowiki.es/fororw/viewtopic.php?f=667&t=29522



On Mon, Sep 30, 2013 at 10:18 PM, Luis Antoniosi (CoCoDemus) <
retrocanada76 at gmail.com> wrote:

> Your answer is on IC39. LM1889: It has several chroma inputs. Need to know
> if one of them is useful. I bet on pin 13 Chroma Subcarrier.
>
>
>
>
> On Mon, Sep 30, 2013 at 3:09 PM, Ken H. <dragon.atv at gmail.com> wrote:
>
> > Looking at the Tano motherboard I can't see an MC1372
> > http://archive.worldofdragon.org/images/4/40/Tano64.png
> >
> >
> >
> > On Mon, Sep 30, 2013 at 9:58 PM, Luis Antoniosi (CoCoDemus) <
> > retrocanada76 at gmail.com> wrote:
> >
> > > Is there a chrominance output on it ?
> > >
> > >
> > > On Mon, Sep 30, 2013 at 2:57 PM, Ken H. <dragon.atv at gmail.com> wrote:
> > >
> > > > This is an amazing video quality for the CoCo1 !
> > > > Do you think a similar mod could be done with the Tano Dragon?
> > > >
> > > >
> > > > On Mon, Sep 30, 2013 at 5:59 AM, Luis Antoniosi (CoCoDemus) <
> > > > retrocanada76 at gmail.com> wrote:
> > > >
> > > > > With a very simple driver you can make a perfect a s-video output
> for
> > > > your
> > > > > coco1
> > > > >
> > > > > http://www.youtube.com/watch?v=47r1S8Sjr20
> > > > > http://www.youtube.com/watch?v=2AYpUA5H5tg
> > > > >
> > > > > https://pbs.twimg.com/media/BVYIpfxCEAAy8kO.jpg:large
> > > > > https://pbs.twimg.com/media/BVYItw_CQAAQupH.jpg:large
> > > > > https://pbs.twimg.com/media/BVYIxdGCcAEMydj.jpg:large
> > > > > https://pbs.twimg.com/media/BVYI0ZaCAAAikiF.jpg:large
> > > > > https://pbs.twimg.com/media/BVYJEVaCQAAJz1z.jpg:large
> > > > > https://pbs.twimg.com/media/BVYJIJQCQAAXWOf.jpg:large
> > > > >
> > > > > Basicaly s-video signal works with 2 signals: Luminance and
> > > chrominance.
> > > > > The luminance you can use the same monochrome driver you are used
> > to, 2
> > > > > transistors tied on Y output from 6847. But the chrominance you get
> > > from
> > > > > 1347 pin 8. A 300 Ohm resistor is needed to reduce the vertical
> > lines.
> > > It
> > > > > worked with 2 monitors an a s-video / vga converter I have here.
> > > > >
> > > > > Check the video how to get artifact colors from it.
> > > > >
> > > > > Didn't test on coco2, dunno if works since the 1372 is connected
> > > > different
> > > > > there.
> > > > >
> > > > >
> > > > > --
> > > > > Long live the CoCo
> > > > >
> > > > > --
> > > > > Coco mailing list
> > > > > Coco at maltedmedia.com
> > > > > http://five.pairlist.net/mailman/listinfo/coco
> > > > >
> > > >
> > > > --
> > > > Coco mailing list
> > > > Coco at maltedmedia.com
> > > > http://five.pairlist.net/mailman/listinfo/coco
> > > >
> > >
> > >
> > >
> > > --
> > > Long live the CoCo
> > >
> > > --
> > > Coco mailing list
> > > Coco at maltedmedia.com
> > > http://five.pairlist.net/mailman/listinfo/coco
> > >
> >
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> >
>
>
>
> --
> Long live the CoCo
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco
>