[Coco] 80 column pak prototype

[Luis Antoniosi (CoCoDemus)]

I'm taking both grounds top/bottom through a via. Ain't this enough ?




On Wed, Oct 23, 2013 at 2:12 PM, Gene Heskett <gheskett at wdtv.com> wrote:

> On Wednesday 23 October 2013 14:06:56 Mark Marlette did opine:
>
> > Luis,
> >
> > Fun stuff!
> >
> > On the note of strange characters. As it appears that these proto-boards
> > are a good thing, they are not good for digital design at MHZ rates.
> >
> > The CoCo's address bus is not buffered, unless you have a Pro-Tector+,
> > so just driving through the ribbon cable to your board will be
> > degraded. My tests shown ~3-4" was max, YMMV.
> >
> > The proto-board adds capacitance to every point, some cases that is
> > good, most cases it is not.
> >
> > So your circuit can be wired electrically correct and it still will not
> > work just by how you physically built it. That is not to say you don't
> > have a wiring issue. :)
> >
> > Generally it is cheaper and will yeild better results to have a board
> > made.
> >
> > My $0.02.
> >
> > Any case, enjoy and continue your great work on the software and
> > hardware!
> >
> > Regards,
> >
> > Mark
> > http://www.cloud9tech.com
>
> And I'll throw in another 2 cents, Mark.  This board is dependent on the
> single ground pin in the socket connector.  It is not a very good ground.
>
> I'd at least try adding another wire from the ground bus on the board back
> to one of the clips that grab the grounding ears of most boards, one on
> each side of the socket proper.
>
> > ________________________________
> >  From: Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com>
> > To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> > Sent: Wednesday, October 23, 2013 6:52 AM
> > Subject: [Coco] 80 column pak prototype
> >
> >
> > Hi all,
> >
> > Having all the components at hand I started prototyping yesterday:
> >
> > pic.twitter.com/aAnpm39NwL <http://t.co/aAnpm39NwL>
> >
> > One hour later:
> >
> > pic.twitter.com/dOEpz5Y91K <http://t.co/dOEpz5Y91K>
> >
> > And turning this thing on:
> >
> > pic.twitter.com/rl4fNtssfa <http://t.co/rl4fNtssfa>
> >
> > You can see some characters are strange, I must have swapped a bit in
> > the data bus or something. It was too late yesterday to troubeshooting
> > but HEY IT WORKS!
> >
> > Those protoboard jumpers are really helpful. :)
>
>
> Cheers, Gene
> --
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-- 
Long live the CoCo