[Coco] MPI mod for coco3

[Ken H.]

On Thursday, March 13, 2014, Kip Koon <computerdoc at sc.rr.com> wrote:

> Hi Luis & All!
> I have an old gray MPI that I thought I'd upgrade to be Coco 3 compatible
> with the Coco 3 version pal chip in case I ever needed to run two Coco 3s
> simultaneously.  Before the upgrade, it worked great with my Coco 1, but it
> will not let the Coco1 boot anymore.  Do I need to pull the new pal chip
> out
> and put the old one back in?  I have the Coco 3 white MPI for one coco 3
> already.  Thank you in advance for any help with this situation.  Take care
> my friends.
> Kip
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com <javascript:;> [mailto:
> coco-bounces at maltedmedia.com <javascript:;>] On
> Behalf Of Luis Fernández
> Sent: Thursday, March 13, 2014 1:40 PM
> To: COCO
> Subject: [Coco] MPI mod for coco3
>
> Hello friends
> I'm trying to sort cocopedia information about the modification of MPI for
> use in coco3, and have some doubts There are 4 models Multipak interface
>
> Exist the Following models:
> 26-3024 Grey
> 26-3024 White
> 26-3124 White
> 26-3124A White
>
>
> The latter does not require modification (that's right?) The first two have
> the same internal circuit. and would like to revise my outline, not a lot
> of
> electronics.
>
> Apparently there are two methods, one changing the PAL / GAL chip, not that
> this is not where (or number) in the two boards And the other placing a
> 74LS10 to restrict the addresses and stuff.
> Is this true or both at once are needed?
> thanks
>
>
>
>
> ----------------------------------------------------------------------------
> -----
> Making  CoCoDskUtil V 1.X.X, Scan magazines and organize maltedmedia
> http://cococoding.com/cocodskutil/ Thank Aaron Wolfe
> http://www.tandycoco.com Thank Brian Blake and Stephen Fischer
> My personal blog: http://www.luis45ccs.blogspot.com,
> Excuse my English, I use google translator, my language is Spanish, I'm
> Spanish but I live in Venezuela
>
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