[Coco] CoCo 1 64K upgrade failed :(.

[Ryan Pritchard]

Hi Darren,

Yes I put a jumper on the R83 pins.  Double checked everything I could  
think of.  As mentioned desoldering the chips may have burnt even just  
one of them.  Someone suggested Jameco, the chips are about a buck a  
piece.

Regards,

Ryan Pritchard
Fun Extends All Basic Life Expectancies



On 25-Sep-08, at 10:08 PM, Darren A wrote:

> Did you also make sure that the R83 pins have a jumper or resistor
> connecting them?
>
> Darren
>
> ---------
>
> On 9/25/08, Ryan Pritchard <coconut at pritchard.ca> wrote:
>> Hi all,
>>
>> I followed the instructions for the 32K / 64K upgrade that I was
>> provided.  I compared all 3 to 4 versions including a 32K only one.
>> The nice part was the 32K only upgrade was the same steps for the 64K
>> upgrade sans some extra jumper wires.
>>
>> I only got as far as having desoldered my 64K x 1 DRAM from my extra
>> Apple //e 80 Column Card, and following the steps up to the end of  
>> the
>> 32K upgrade instructions.
>>
>> The CoCo does not boot.  I have cut all eight of the correct
>> capacitors C31, C35, C45, C48, C61, C64, C67, C70, moved all the
>> jumpers to the 32K setting, and tried both the LOW and the HIGH back
>> jumper positions.
>>
>> I think I may have burnt out the 64K x 1 DRAMs.  I don't know what
>> else it could be and since I removed all eight caps breaking a couple
>> in the process I can't return to the 16K system :(.
>>
>> I guess my options are find a good set of 64K x 1 DRAM, or cut my
>> losses and pick up a CoCo 3 from Cloud 9.
>>
>> Currently kinda frustrating because the Extended Color Basic ROM I  
>> got
>> confirmed the FDC works.
>>
>> Regards,
>>
>> Ryan Pritchard
>
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