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Posted By

DeadTED
on 2000-05-10

How To...

I have come accross this problem many times and the cause is one of two things or both.

1. Faulty 8501 chips very likely
2. Faulty RAM chips also very likely, but less likely than 1.

I would start off by replacing the ram chips first on both machines.

To do this visit
http://skyscraper.fortunecity.com/chaos/736/index.html

and click on the "Instructions for C16-memory-expansion to 64kb" link.

after doing this if both still don't work then you have faulty 8501 CPUs.

I also will be uploading detailed repair / Testing instructions and schematics for the C16 Published by SAMs to the C16 Plus4 Supersite next week.

http://www.geocities.com/claude_nehme

Posted By

PyramidHead
on 2000-05-10

Thanks! I'd like to get at least one of 'em going again...

One of them belonged to my Grandad and was the first computer I ever used, so it would be kind of nice... :)

Posted By

PyramidHead
on 2000-05-09

C16 repair info wanted!

Any idea where I might find C16 repair information? I've got two broken C16s, a set of schematics, and no idea what's wrong (yet)!

One of them has 'black screen death' and the other does semi-random things on power up (almost always a solid screen, but can be black, 'border blue', or orange.

Swapping the CPUs appears swaps the faults, so I suspect that I've got a pair of buggered 8501s...