[Coco] S-Video mod for Coco1

[Retro Canada]

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
>>>> 
>>>> --
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>>> 
>>> 
>>> 
>>> --
>>> Long live the CoCo
>>> 
>>> --
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>>> Coco at maltedmedia.com
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>> 
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> 
> 
> 
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> 
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