IBM Z50, 48Mb RAM, 1Gb MicroDrive, Lucent WaveLAN Gold PCMCIA 802.11B card.
NetBSD 1.5_BETA2 from 12/2 or so.

The card detects on boot properly:

wi0 at pcmcia0 function 0 port 0x15000400-0x1500043f
wi0: address 00:02:2d:09:2b:fa

...But kernel panics when the card is ifconfig'ed.

# ifconfig wi0 172.16.0.27 netmask 0xffffff00 up
pcmica: card irq 3
trap: address error (load or I-fetch) in kernel mode
status=0x7803, cause=0x510, epc=0x8016c804, vaddr=0xc001622f
pid=185 cmd=ifconfig usp=0x7fffec18 ksp=0xc3cdf6a8
Stopped in ifconfig at  0x8016c804:        lhu      vi,0(s0)
db>