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    > I am quite certain it is not a Disc Controller Card!

    Full ACK!

    This strange ground screw, the additional capacitors and the type of label on EPROM makes me guess that its a card for some custom made hardware.

    If you are very interested you could check if the EPROM contains firmware and if yes, check out the firmware ID bytes (see…otes/misc/tn.misc.08.html). This way you could at least clarify if the card is supposed to connect some character device ($Cn05 = $38), some mass storage device ($Cn05 = $20) or - what I guess - something completely different and doesn't care at all about firmware ID bytes.