Posted By
kopsec
on 2014-05-17
04:18:39
|  Re: When Are The Plus/4 Family Of Computers Considered To Be Dead ?
Most of 8 bit computers are quite easy to repair, just need chip swapping, reseating or deep cleaning.
If you have a difficult fault not solved with this, then it is time consuming to repair, but if you have the knoweledge and the schematic it's only a matter of time. If you are doing as a hobby then you spend all the time you have until fixed. Intermitent faults are the more dificult 
Appart from the odd TED or CPU all the other chips and TTL logic are easy to find and very cheap.
I have now 2 C16 boards not working, but they need 2 CPUs and 1 TED, but I have 2 perfect working ones. When I have time enough I will try to fix this 2 boards, in the meantime they can serve as spares for the 2 working ones.
Imperious have a look to this forum in Spanish, they managed to make the 8501 CPU from a board using 65C02 cpu
http://www.retrowiki.es/fororw/viewtopic.php?f=687&t=28683&sid=4e676b64222a2a2556f25bfa306cdc8b&start=10
I had to buy the 8501 for my C16 on ebay germany, it was the CSG CPU that runs cooler:
http://www.ebay.de/itm/MOS-Commodore-8501-Prozessor-CPU-2MHz-DIP40-/231186294448?pt=Bauteile&hash=item35d3c6e6b0
Ask the seller for shipping cost if the price is OK for you.
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