[Coco] Pristine image on coco2 and coco3 with GBS8200

[Luis Antoniosi (CoCoDemus)]

Here is the circuit:

pic.twitter.com/nIwx3GeR <http://t.co/nIwx3GeR>

You will need:

4x 2n4401
3x 1K Ohm resistor
1x 4.7K Ohm resistor
1x 150 Ohm resistor
2x 75 Ohm resistor

It drives YCbCr in 480i. So, don't expect your brand new TV will be capable
of handling it. None of my HD Tv weren't.

Again, thanks to Daniel Campos who shared this circuit with me. I modified
it to get the signals direct from the MC6847 instead.

Felipe





On Wed, Feb 6, 2013 at 11:37 AM, Mike Rowen <mike at bcmr3.net> wrote:

> Looks nice! Will you share the Coco2 circuit?
>
> On Feb 6, 2013, at 11:12 AM, "Luis Antoniosi (CoCoDemus)" <
> retrocanada76 at gmail.com> wrote:
>
> > Hi, I just got my GBS8200
> >
> > pic.twitter.com/azoqNt7z <http://t.co/azoqNt7z>
> >
> > For the coco3, i inverted and composed the H and V signals into CSync,
> > unplugged the RGB pin 10 and drove it from there. The result is:
> >
> > pic.twitter.com/LthL95M5 <http://t.co/LthL95M5>
> > pic.twitter.com/rq4KmkA6 <http://t.co/rq4KmkA6>
> > pic.twitter.com/6TmSx5Ro <http://t.co/6TmSx5Ro>
> >
> > Then comes coco2b time. Thanks to Daniel Campos I made a video component
> > driver (on a solderless breadbord, shame on me :P ) and here are the
> > results:
> >
> > pic.twitter.com/52uH4Qy6 <http://t.co/52uH4Qy6>
> > pic.twitter.com/RTXAYsyA <http://t.co/RTXAYsyA>
> > pic.twitter.com/5ICrU770 <http://t.co/5ICrU770>
> > pic.twitter.com/RTmCzo69 <http://t.co/RTmCzo69>
> > pic.twitter.com/RTmCzo69 <http://t.co/RTmCzo69>
> > pic.twitter.com/s2qLqLVG <http://t.co/s2qLqLVG>
> >
> > Quite as good as coco3 rgb :D
> >
> > The only con is this board is jerking the image for video component
> > sometimes. Dunno if it's a problem with the board or my circuit. I need
> to
> > check. But the results are very impressive.
> >
> > I saw in this list people had problem with this board, but since I
> inverted
> > the signals everything works perfect!
> >
> > Felipe.
> >
> > --
> > Long live the CoCo
> >
> >
> >
> > --
> > Long live the CoCo
> >
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> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
>
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Long live the CoCo