[Coco] CoCo bus interface project

[Matthew Stock]

On Mon, Apr 15, 2013 at 3:41 PM, Luis Antoniosi (CoCoDemus) <
retrocanada76 at gmail.com> wrote:

> Hi Matthew,
>
> I can see you use a GBS8200 to convert the coco3 rgb. I have one but image
> skips a lot. Seems to be related to grounding. I can see you're using the
> power molex to connect something else,
>
> i could tell you got the ground from PSU and connected to the RGB input
> ground, is that right ?
>
>  Did you do something to fix the freaking bouncing screen ?
>
>
If I did something, it was probably accidental.  :-)

I took a switched 5v wall wart I had lying around, and I attached it to a
barrel connector to provide power to the board.  I also needed power for
the composite sync board, and so followed the path of least resistance and
used the molex connector on the GBS board as an INPUT for that sync board.
The GBS board has a wider input range, but I need to remember to only feed
it 5v for this reason.  You're correct that I tie the power and signal
grounds together (so common ground for coco and GBS).

There are a few different variants of the GBS board.  I can look tonight
and see what specific version I have and let you know.
  -Matt