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Anyone know what PCB this is?
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VK3DRB:

--- Quote from: helius on March 10, 2021, 02:08:37 am ---mikeselectricstuff beat me to the punch, but the network OUI is owned by MSC Vertriebs GmbH.

--- Quote ---MSC Vertriebs GmbH
00:30:D6
00:03:05
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MSC is an Avnet subsidiary (so it is under the same corporate umbrella as Newark and Farnell). They no longer list EISA modules in their brochure, but you could try contacting them. They also trade as "Avnet Integrated".

A little searching for "MSC Vertriebs" + "EISA" turns up this: PISA-PIII-TwisterT All-In-One Socket 370 CPU Card

--- End quote ---

BRILLIANT!  :clap: I downloaded the manual which is clearly for this CPU board. It tells me heaps. Like a lot of German products, it is well documented. Surprisingly, board was designed in 2002. That CPU is quite leading edge for its day. I will see if I can get a replacement. Another reason I don't want to debug this is because the machine is in a clean room where the industrial PC enclosure/backplane cannot be removed, and I have to put on or remove protective clothing, shoe covering, beard covering, head covering every time I go from the electronics lab to the clean room, and you cannot solder in the clean room - it would drive me nuts.

This reminds me of in the 90's, IBM had a $750K solder paste screening machine made by New Long in Japan with scant documentation available and no schematic diagram. Murphy's law: It died an a couple of hours before the family Christmas party was to start. So everyone headed off to the party except myself and another guy who had to fix the machine as priority. The machine had 12 large PCB's in it. VERY difficult to debug as there was no schematic and PCB's removed, circuits traced, wires soldered, system powered up each time etc. I traced the fault to a faulty small signal transistor and replaced it with an equivalent I had in the junk box at home. Got the machine fully up and running at 2am the next morning. Although management at IBM did not consider bringing us a beer or snags from the Christmas party BBQ :-- or even checking to see how things were going  :palm:, I did get a great sense of achievement in debugging that board  :-+.


mikeselectricstuff:

--- Quote from: VK3DRB on March 10, 2021, 03:47:30 am ---. I traced the fault to a faulty small signal transistor and replaced it with an equivalent I had in the junk box at home.

--- End quote ---
Hope you sent them a big fat invoice for that transistor, considering how much it would have saved them....
VK3DRB:

--- Quote from: mikeselectricstuff on March 10, 2021, 10:10:56 am ---
--- Quote from: VK3DRB on March 10, 2021, 03:47:30 am ---. I traced the fault to a faulty small signal transistor and replaced it with an equivalent I had in the junk box at home.

--- End quote ---
Hope you sent them a big fat invoice for that transistor, considering how much it would have saved them....

--- End quote ---

I was an IBM professional employee, so not even any overtime pay. In this solder screen printer case, not even a thank you, let alone a beer. It was my big mistake working 50 to 60 hour weeks for years for IBM. Finally when they sold us off to a startup, IBM confiscated about $40K of my retirement funds, but they did offer a 30% discount on a new IBM Aptiva PC to recognise my 18 years of service. However, I did get a great sense of satisfaction fixing that challenging machine and a few other machines in the plant over the years even though it was not my primary job to do so.

Now I run my own consultancy, I am much happier doing PCB design work (and some manufacturing) and getting paid for my efforts. Clients just get an invoice for the actual hours spent to which I pay my fair share of taxes. I like to sleep at night.
coppice:
Interesting. I didn't realise anyone ever put this kind of industrial PC on an EISA bus card. It must date from quite a small window in time. EISA took quite a while to get some momentum, then died quite abruptly when PCI finally started to work.
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