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

[Mike Pepe]

Yeah, you almost certainly killed those DRAMs by desoldering them.

Have you got ten bucks?

Go to www.jameco.com and put 4164 in the search box. Order 8.

Given how cheap they are, I can't imagine going through the hassle of
desoldering 128 pins!

:)

> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of Ryan Pritchard
> Sent: Thursday, September 25, 2008 7:09 PM
> To: coco at maltedmedia.com
> Subject: [Coco] CoCo 1 64K upgrade failed :(.
> 
> 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
> Fun Extends All Basic Life Expectancies
> 
> 
> 
> 
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