Hi,yes, melf is right: The nicpak is the best approach. Another way could be to install the pci+agp bus sniffer (@hobbes: http://hobbes.nmsu.edu/pub/os2/util/misc/pci103vka.zip )
I don't know the machine... if it's a vintage model, it might have ISA cards... but if not, the sniffer will detect the type of adapter and show you.
Might be worth having a copy of the sniffer at hand so you'll find out the rest (graphics, sound, usb...) too without opening the case...
Greetings
Thomas