I just did a fresh install of 7.1 on an IBM Thinkpad 700 (9548-30U) and I have tried two PCMCIA network cards.
It doesn't detect wither of them as it is booting and checking for new hardware.
Both of the NICs are known-good. One is a 3Com 3c589c and the other is an IBM EtherJet card (FRU 72H5163, p/n 72H4041).
Is there is something special I need to do to get PCMCIA cards to be detected?