[Coco] 26-3124 M.P.I. Upgrade #2

[Mark Marlette]

Ah, bulk will drive the $$$ down. :)


----- Original Message -----
From: sales at gimechip.com
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Tue, 29 Jun 2010 19:30:23 -0000 (UTC)
Subject: Re: [Coco] 26-3124 M.P.I. Upgrade #2

no - only install one :-)
I bought the 16v8 in bulk - still have hundreds :-)
It's just easier for me to install the gal than to prepare the 74LS10 for 
piggybacking. I never do trace cuts on anything - In fact, when I would do 
the 74LS10 Mod, I would snip pin 19 and do it that way. I don't know why :-)

----- Original Message ----- 
From: "Mark Marlette" <mmarlette at frontiernet.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, June 29, 2010 1:28 PM
Subject: Re: [Coco] 26-3124 M.P.I. Upgrade #2


> John,
>
> I have done a few of these mods.... :)
>
> A few observations on your procedure.
>
> 1. 16v8 is ~1.00, 74LS10 is ~$0.50.
> 2. Difference between cut trace & cut pin? I have never reversed the mod 
> after it was installed.
> 3. 100% compatible with the Tandy Satellite Board Upgrade, install both?
>
> A good training exercise.
>
> Regards,
>
> Mark
>
>
>
> ----- Original Message -----
> From: sales at gimechip.com
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Tue, 29 Jun 2010 11:49:57 -0000 (UTC)
> Subject: [Coco] 26-3124 M.P.I. Upgrade #2
>
> I've just posted my method of using a 16v8 GAL chip to upgrade the 26-3124 
> M.P.I. to CoCo 3 compatibility here:
> http://www.coco3.com/community/2010/06/26-3124-mpi-coco-3-upgrade-2
> Normally, this is done with a 74LS10, a trace cut, and some jumper wires. 
> My method DOES NOT require a trace cut and is 100% compatible with the 
> Tandy Satellite Board Upgrade. The caveat? You have to program a 16v8.
> -John
>
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