[Coco] 512k upgrade for coco3

[Walter Miraglia]

Sorry I should have mentioned that, it's 8 chips, I know the sims with three chips do not work well with the CoCo3.   Thank you for your reply...  The gentleman who sold me the upgrade is sending me a replacement to try... Fingers crossed...  

Cheers.


Sent from my iPad

> On Sep 24, 2015, at 10:30 PM, Mark Marlette <mmarlette at frontiernet.net> wrote:
> 
> 
> 3 or 8/9 chip simms?
> 
> 
> Mark
> 
> www.cloud9tech.com 
> 
> Sent from Yahoo Mail on Android
> 
> From:"Walter Miraglia" <walter.miraglia at gmail.com>
> Date:Thu, Sep 24, 2015 at 7:33 PM
> Subject:Re: [Coco] 512k upgrade for coco3
> 
> Ok I thought so,  but i was looking at the schematic and thought, perhaps
> because the ram in my 512k upgrade was dynamic, it too required the little
> caps to remain... i was just looking for a reason as to why the 512k ram up
> grade i have is flakey :)
> 
> ok i will have to pursue other avenues...
> 
> ok i wont have to order 82pf caps unless i give up on 512k :)
> 
> thanks for your reply. :)
> 
>> On Thu, Sep 24, 2015 at 8:26 PM, David Ladd <davidwladd at gmail.com> wrote:
>> 
>> There are two caps that need to be removed for any upgrade to 512K, 1M, 2M,
>> those rare larger boards.
>> 
>> Those two caps are only required if using the base 128K.
>> 
>> On Thursday, September 24, 2015, Walter Miraglia <
>> walter.miraglia at gmail.com>
>> wrote:
>> 
>>> Hi there.  I am wondering,  if I am upgrading my coco3 with an older
>> dual
>>> 30 pin sim based upgrade that uses dynamic ram sims, do I need to remove
>>> the two small caps (82 and 27 pf caps on the RAS and CAS lines)?  Or is
>>> that only for the 512k static ram upgrades triad one?
>>> 
>>> I wonder as I am having issues with an old ram upgrade where basic ram
>>> tests seem to pass but more involved use of ram, running applications
>> like
>>> donkey kong seem to crash.  I did remove those two caps and installed my
>>> 512k dram based ram upgrade.  I'm wondering if I should have left them?
>>> Should I solder in a couple and try it again?  ( I would have to order
>> some
>>> )
>>> 
>>> Please advise.  Any help appreciated.
>>> 
>>> Sent from my iPad Mini
>>> 
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>> 
>> 
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