No error messages? Then I'm not sure.
PCMCIA Network Adapter Issues
Problem with Fiberline PCM-FE1500 Fast Ethernet card
Date: 2000, Apr 24
From: David Hinds <firstname.lastname@example.org>
Do you get any error messages in your system log while the card is in
use? Anything like "interrupt(s) dropped"?
You might want to try another interrupt even if you are getting no
errors. You can exclude interrupts in /etc/pcmcia/config.opts.
possible Half/Fullduplex problem by email@example.com, 2000, Apr 25
to: "No error messages? Then I'm not sure."