mikeselectricstuff beat me to the punch, but the network OUI is owned by MSC Vertriebs GmbH.
MSC Vertriebs GmbH
00:30:D6
00:03:05
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
BRILLIANT! 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
, I did get a great sense of achievement in debugging that board
.