In case anyone cares, I got PCMCIA working on my tibook. I changed /etc/pcmcia/config.opts from include port 0x1000-0x10ff, port 0x1400-0x14ff include memory 0x80400000-0x807ff000, memory 0xf3000000-0xf33ff000 to include port 0x1000-0x1fff include memory 0x90000000-0x90ffffff
The first set was from the output of lspci -v, which I read about in some old list message. The second set came from http://www.powerbook.org/linux/g4linux.html. My PC card is now correctly identified as an 'ATA/IDE Fixed Disk' and ide-cs sets it up as /dev/hde.