[Coco] Unreliable Coco3

[Bill Pierce]

Hi guys,
I had similar problems with my Coco 3 back in the 80s. Luckily, I had a friend who was a tech at a local shop and was also a Coco enthusiast. He pointed out a smaller chip (looking down into an open Coco) on the lower left hand side of the 2 large chips left of the GIMI. He said these go out on a regular basis, so he pulled the chip, put in a socket, and put in a new chip. He told me if I had any old broken Cocos around (I did), that if the chip went out again, to just pull the same chip and replace with one from the old Cocos. This chip is in both Coco 3s and 2s. There are 2 large & 2 smaller chips on that side of the GIMI and I'm not at home with my Coco, so I cannot check to see which of the smaller chips it is, as it is now socketed on my old Coco. I had to replace this same chip again in the late 90s (same coco) and was glad he put in the socket. The one thing I do remember about the 2 smaller chips (ic6 & ic7 in the sevice man), one is only in Coco 3 (I think) and the other is in the 2 & 3. The chip that is in both is the one I kept having to replace. I will check the number on these when I return home on friday.

I'm not saying this your problem, just a possibility
Bill P

Music from the Tandy/Radio Shack Color Computer 2 & 3
https://sites.google.com/site/dabarnstudio/
Bill Pierce
ooogalapasooo at aol.com




-----Original Message-----
From: Brian Blake <random.rodder at gmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Mon, Oct 22, 2012 9:11 am
Subject: Re: [Coco] Unreliable Coco3



Hey David,

The problems with mine started out being intermittent. Then it got to a 
point where and attempt at drive access would trigger the drive LED and 
that was it; shortly thereafter was nothing - this all happened very 
quickly. If you go to the Maltedmedia archives around January of 2010, 
you'll see two threads: