[Coco] 80 column pak prototype

[Luis Antoniosi (CoCoDemus)]

ah ok, thanks for the advice :)

I'll try a shorter ribbon cable too.


On Wed, Oct 23, 2013 at 8:59 AM, Mark Marlette <mmarlette at frontiernet.net>wrote:

> 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
>
>
>
>
>
>
> ________________________________
>  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. :)
>
> --
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>
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