[Coco] Multi-Pak 26-3124 Upgrade

[Barry Nelson]

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?