[Coco] I got another coco2 today. A couple of questions.

[Bob Devries]

Mark,

using the 4464 chips works fine in the coco2. I have done many of these 
upgrades.

The piggy-back chip sounds like an after market mod. I seem to remember 
there was a mod like that described somewhere, maybe in one of the Coco 
magazines?

Regards,
Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "Mark Ormond" <markormond at mtxsystems.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Thursday, July 21, 2011 2:24 AM
Subject: [Coco] I got another coco2 today. A couple of questions.


> It's a 26-3134a model with a 20261044 motherboard.
>
> It's currently at 16k, with socketed 4416 chips. I have 4464's, so is it 
> just a matter of replacing the chips and then jumpering j6?
>
> Also there is a weird piggy back chip on ic 13 (a 74ls02) that has a 
> jumper wire routed from a eclk test point near the cpu and then it has 
> jumper wires going to the 74ls138 located at ic16. Was this there from the 
> factory?
>
> later,
> dabone
>
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