Bocaboard MCA 25-pin bi-directional parallel port Microchannel Boca Research IBM

Boca Research 25-pin bi-directional parallel port for Micro channel systems

BMCP01

For IBM PS/2 Micro Channel Computers

https://www.ardent-tool.com/comms/Boca.html

Unused, and untested -- no reason why it shouldn't work, no issues with capacitors as far as I can see.