[Coco] MPI 3126 upgrade

[Roger Merchberger]

Rumor has it that Robert Gault may have mentioned these words:
>Chester A Patterson wrote:
>
>>That's the point. For the 3124 C9 needs to have the MPI sent there but
>>for me it is prohibitive, I live in Costa Rica. I have no problem
>>openning, cutting, tracing and soldering, I just need to know WHAT to
>>do!
>
>Have you considered that the 3124 version may not need any changes? You 
>have never seen any problems and after several years of use you certainly 
>ought to have seen something.

I don't have all of the stats, but off the top of my head, there needs to 
be a 74LS10 piggy-backed onto one of the existing TTL chips, which I 
believe is also a 74LS10.

If you open your MPI and see a "dead-bug" with tendrils going to other 
traces/lands on the MPI's mobo, then you have the fix. If not, then no.

Here's more from the archives:

http://five.pairlist.net/pipermail/coco/2006-September/025092.html

One thing I can say: A non-upgraded MPI can work just fine with a CoCo3 if 
you don't do anything that diddles with the bug - I had a non-upgraded MPI 
hooked to mine for... well... forever and worked fine, but all I had was a 
floppy interface in slot 4 & some program paks the kids like... nothing 
hardcore.

HTH,
Roger "Merch" Merchberger

--
Roger "Merch" Merchberger  --  SysAdmin, Iceberg Computers
  _±±_                          zmerch at 30below.com
(©||®)  If at first you don't succeed, nuclear warhead
  _)(_   disarmament should *not* be your first career choice.