Okay, I've been sitting on this one hoping to have more than just the one ROM for this update, but I haven't gotten around to digging more out of my shed.
So! This is the ROM from what I thought was a weird back-plane-mounted full-length NIC,
but it's actually a Serial-interface card from a KVM, used to control Terminals remotely.
Made by Cybex (later acquired by Black Box) it was used in the 'BLACK BOX KV150A-R2 MULTI SERVSWITCH SYSTEM 156385' KVM.
The cards sold by Black Box even still have the Cybex silkscreen on them! (as seen in the included pictures, grabbed from ebay)
I've also included the manual for that KVM, along with the pictures of the CPU-card, power-supply, Serial-interface card, and the back-plane.
Plus a listing of all the significant chips on the board. Two 40-pin chips that I can't currently dump.
Possibly the Programmable Watchdog Supervisory E2PROM chip could be dumped, but it's not socketed.
62-pin ISA-style card-edge, four RJ-45 ports, and eight config-switches that I couldn't find mention of in the manual.
Not sure if there's anything I could do with this aside from selling it, untested, as-is, or break it down for parts.
For now, I'll preserve it as-is, maybe compare its pin-out to an ordinary ISA slot later down the line, on the off-chance they just copied that for their back-plane.
(the CPU-card uses a PCI-style interface, as can be seen in the pictures, while the power-supply uses pin-headers, odd mix of connectors/standards)
Have fun out there and see you next time!