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Does anyone recognise this logo? DD?
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TomS_:
I bought a few random eurocards, just for some reverse engineering practice since they all have parts I am reasonably familiar with.

But I cant find any information about these cards when I search for the model numbers printed on them. Was hoping to potentially track down some datasheets to see how far off I am with my understanding and maybe compare my schematic to the manufacturers if available.

Maybe someone recognises the logo of, presumably, the manufacturer?
Labrat101:
I guess you checked if it was   D&D Electronics, LLC
are there any other clues .
CJay:
Pic of more of the card might be helpful but Eurocard is such an old standard and there are *so* many companies that used it for niche products, in house stuff, custom one off stuff, if you don't know what the card was used for or fitted into then it's going to be a slog.

Schematics are going to be similarly hard to find but it'll be interesting to see what turns up, never know, weird unexpected things happen here, like the designers of ancient test gear turning up to give tips on repair or design choices so who knows...

TomS_:

--- Quote from: Labrat101 on December 02, 2020, 07:56:12 pm ---I guess you checked if it was   D&D Electronics, LLC
are there any other clues .

--- End quote ---

They dont seem to be related.

No real clues, just some model/part numbers which all start with DD.

e.g. the "optoisolated input" card is model DD8019. It has a PAL on it with a label that reads "DD4098".
TomS_:
Bigger photo of the optoisolated input board attached.

The pinout of the bus doesnt seem to match any of the different bus standards I could think of. But as you say, anyone could basically come up with their own for their own applications.

Ive got a load of PRO-LOG datasheets/manuals for a wide variety of cards that include schematics and functional descriptions, and even code examples for working with them. Was kind of hoping to find something similar for these cards, but Im doubting they even exist if I cant even find a reference to the model number of the card itself. :)
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