[Coco] Multi-Pak 26-3124 Upgrade

[John B]

Thanks Barry. I don't want to piggyback either but I am having a hard time
finding a PCB/perf board small enough.  I am open to any recommendations.

On Fri, Jul 17, 2015 at 12:54 AM, Barry Nelson <
barry.nelson at amobiledevice.com> wrote:

> I did not piggy back, if you do, try to find one that is the same number
> of pins. You will only need to connect the power and ground pins to the
> other chip, so as long as those line up it doesn't matter what chip you
> choose. What I did was I used a small experimenter PC board, ran wires, and
> hot glued it to the inside of the multi-pak, and there it has sat for the
> last several years. Mount it anyway you want, just pay close attention to
> the schematic and the wiring and make sure any wires stay out of the way
> and are fastened down so they don't move. Also make sure you do the test to
> make sure the CoCo 3 issue with the pak has been fixed.
>
> From BASIC's OK prompt, type PRINT PEEK(&HFF90) and press ENTER. If 126 is
> returned then the Multi-Pak has been upgraded. If it returns 255 then it
> has NOT been upgraded successfully.
>
> On Jul 16, 2015, at 11:12 PM, coco-request at maltedmedia.com wrote:
>
> > Date: Thu, 16 Jul 2015 22:14:32 -0400
> > From: John B <trymyz at gmail.com>
> > To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> > Subject: Re: [Coco] Multi-Pak 26-3124 Upgrade
> > Message-ID:
> >       <
> CAC02fFjjcJPB62o+fvOjaTQoDqFyna0AFmB+2vBYErmxJGLvxw at mail.gmail.com>
> > Content-Type: text/plain; charset=UTF-8
> >
> > Barry,
> >
> > When you did you MPI upgrade, did you piggyback off any chip?  If so,
> which
> > one?
>
>
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