[Coco] 512 Upgrade

[Mark Marlette]

Stan brings up a good point about the length of the pins. On the CC3 
motherboard, some traces are under the connectors. So if the pins are 
long enough to make it to the MB, the two signals will short out and 
not function properly.

As far as not cutting the caps from other posts. You are lucky and not 
the technical type to understand the logic behind, why you **should**.

I just clip the long lead of the cap in both cases. That way if you 
want to reinstall the 128k, a simple solder connection is all that is 
needed.

Mark
Cloud-9

Quoting Stan Blazejewski <stanblaz at netspace.net.au>:

> G'day Rick,
>
> I remember when I upgraded to 512k many years ago that if I pushed the memory
> board 'all the way home', it wouldn't work.  Whether the pins were 
> going to far
> & shorting something, I don't know, but I made small spacers over a 
> few pins  so
> that the pins would only go 3/4 way into the headers & it worked reliably for
> many years afterwards  (& still is).
>
> On Tue, 8 Aug 2006 12:22:43 -0400, you wrote:
>
>> Anyone who could help me I would be grateful :-)
>>
>>
>>
>> I have had a new Tandy 512 upgrade lying around and a perfectly good cc3
>> with 128k. so I figured why not make a 512 that doesn't work!
>>
>>
>>
>> I removed the existing chips and snipped c65 and c66 dropped the new 512
>> in....
>>
>>
>>
>> Turn it on and get green with no text. Removed 512 and put the old chips
>> in - same thing a green with no text.
>>
>>
>>
>> I am quite sure this has been seen before, if so can you give me a clue?
>>
>>
>>
>> Thanks!
>>
>> Rick
>>
>>
>>
>>
> --
>
> Australia isn't "down under", it's "off to one side"!
>
> stanblaz at netspace.net.au
> www.cobracat.com (home of the Australian Cobra Catamaran)
> http://groups.yahoo.com/group/cobra-cat/
>
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