Electronics > Repair
Fluke 8840A Faulty CPU
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essele:
Hello ... I thought I'd summed it up nicely...

"I'm going to get my three 8840A's up and running and then I never want to see another one ;-)"

I got them up and running and then sold them.

... and I've resisted the temptation a few times when some 8840A's and 8842A's came up on eBay .. I'm working on some other things at the moment and don't plan on doing anything further with this, ever, even if my life depended on it. ;-)

Lee.
cheapskate:
Great work essele, I hope your project gets some attention from the vintage computing community as it seems these Z8 microcontrollers were used in all kinds of inconvenient places. I managed to fix my Fluke 8840 by replacing its CPU with the East German equivalent UB8840. I got the idea from http://john.ccac.rwth-aachen.de:8000/patrick/Z8emu.htm I had to design and order a custom PCB but I made it fit and it seems to pass self tests. Now I need to figure out an issue with resistance measurements.
giosif:

--- Quote from: cheapskate on December 24, 2020, 04:10:33 am ---[...]
I had to design and order a custom PCB but I made it fit and it seems to pass self tests.
[...]

--- End quote ---

Would you be so kind to share the PCB design files?
Thank you!
cheapskate:
Sure thing. I added a cutout to left side of the PCB to give better access to some test points. I hope I configured the KiCad project correctly so that you can open it. I may be placing my remaining PCBs on eBay later as I don't really have a use for them.
coromonadalix:
will you share you code to the eevblog community ?   is the ohms measurements problem(s) hard to resolve ?

thks
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