Dell Inspiron 4000 laptop. Xircom pcmcia combo card - 10/100 nic - 56k modem. Upgraded to pcmcia-cs-3.1.31-r4 and the tulip module disappeared. This broke my network configuration I had to find another card that was supported - boot with it - unmerge pcmcia-cs-3.1.31-r4, and emerge the old version back onto the system. The tulip driver reappeared - I changed the card - works again.
New revision fixes this.