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Coco3 problems


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On 6/21/2022 at 4:29 PM, hhos said:


I'm afraid I remembered incorrectly about that cap, C65.  It is not a decoupling cap, and it is on the RAS/ signal from the GIME.  C66 is not mentioned in the conversion procedure in my tech manual.


<< BIG SNIP >>

This is the Install Manual for the PBJ 512KB Memory Board with 41256-12 DRAMs.  Both C65 and C66 are mentioned and removed when upgrading:
https://colorcomputerarchive.com/repo/Documents/Manuals/Hardware/PBJ 512cc Memory Upgrade Board (PBJ).pdf


The Triad from Cloud-9 and the Boomerang, eventually from me require the removal of C65 and C66.



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On 6/28/2022 at 3:36 PM, jham55 said:

I bought 25 and replaced all of them so not sure 

It is highly unlikely that all of them are bad, so don't throw them away please. If you don't want them send them to me. :)


9 hours ago, MrDave said:

Ram is the hardest working chip in these machines..runs the hottest...wearing out after 35 years in not a big supprise..

I don't agree. The CPU, bus management, and the Video processor frequently run hotter, sometimes requiring heat sinks.  In any case there is probably only one bad chip in the lot unless it's been abused.  Throwing away RAM is a practice reserved for SIMMs, DIMMs, etc. :)


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