It is with all the other drivers
Xircom PCMCIA Ethernet Adapter Issues
Where can I found Linux driver for CBEM+100BTX ? (Anthony BLONDEL)
Date: 2000, Apr 05
From: David Hinds <email@example.com>
It is included in the Linux PCMCIA package. You don't get the driver
as a separate thing. Check the PCMCIA-HOWTO section on "usage and
features" for how to use Linux PCMCIA.
to: "It is with all the other drivers"