[Coco] S-Video mod for Coco1

[Luis Antoniosi (CoCoDemus)]

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