unfortunately the card doesn't work. i think it is missing this socketed chip, which appears to be some sort of Micro Channel bus interface. rather important. i checked the power and ground pins and they don't match the 82C611/612 parts. it's something else.
i did a little digging and found a photo on a German retrocomputing forum (https://www.dosforum.de/viewtopic.php?t=10607). this is the best photo i can find. i don't think this was a very common card. looks like the chip is a "DI" (?) "HCT CIA-2"