[Coco] MPI mod for coco3

[Kip Koon]

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 [mailto:coco-bounces at maltedmedia.com] 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



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Making  CoCoDskUtil V 1.X.X, Scan magazines and organize maltedmedia
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Excuse my English, I use google translator, my language is Spanish, I'm
Spanish but I live in Venezuela
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