[Coco] CoCo 2 problem

[Chad H]

True.. Once upon a time I had a CoCo 2 with a  "daughterboard" of some kind
that had the RAM upgrade on it, I forget the catalog number for the CoCo 2,
it was very long ago.  Anywhoo...This unit is already factory set for 64K,
the jumpers are done and everything.  It already has 8 RAM chips and 64K.  I
just gotta replace them and/or the CPU and hope I catch the culprit in the
process.

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of J.P. Samson
Sent: Saturday, August 06, 2011 11:25 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] CoCo 2 problem

I sure am glad that Tandy with their grand finale CoCo 1--the large  
white-cased model with the "melted" keyboard--socketed just about  
every chip on the board.  It makes life a whole bunch easier than  
trying to desolder/clip out all those RAM chips!  (This is the only  
CoCo 1/2 I own.)

You are aware that you also have to solder in a jumper to activate the  
additional RAM? Hopefully your kit came with instructions on this.   
(Probably need to connect pads J1 and 64K, found near IC7.)

-- JP


On Aug. 6, 2011, at 9:58 PM, Arthur Flexser wrote:

> You might want to also (first?) try socketing and replacing the 6809.
> Seems like every time I had a hardware problem, the culprit turned out
> to be the CPU.
>
>
> On Sat, Aug 6, 2011 at 11:28 PM, Chad H <chadbh74 at hotmail.com> wrote:
>> Ok it seems it would be too costly to have someone else repair the  
>> board so
>> I'm going to take my time and take a crack at replacing the RAM  
>> chips myself
>> to start with..unsoldering the existing ones and installing  
>> socketed RAM.  I
>> purchased a "CoCo 64K upgrade kit" off ebay that consists of the 8  
>> x 4164
>> chips I've heard about.  I'm "assuming" that these will work in  
>> place of the
>> 8 identical RAM chips already soldered in.  However, I cannot find  
>> any
>> information on the factory installed chips anywhere.  They are 8 x  
>> 16-pin
>> DIP, labeled "8042665 / FQD8433" with "TC" and Motorola Logos.   
>> Anyone?


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