[Coco] S-Video mod for Coco1

[Ken H.]

The input for the LM1889 is 12V.

But I think that the chroma subcarrier output on pin 13 is not, if we can
trust the Spectrum service manual
http://www.1000bit.it/support/manuali/sinclair/zxspectrum/sm/sec4_4.html#ic14



On Tue, Oct 1, 2013 at 2:45 PM, Retro Canada <retrocanada76 at gmail.com>wrote:

> but is 12v right ?
>
> On 2013-10-01, at 3:40 AM, "Ken H." <dragon.atv at gmail.com> wrote:
>
> 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
>
> --
> 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
>