I don't use Slackware and I have a different wireless card but I think you might like to know what I did.
My kernel configuration (relevant parts only):
# CONFIG_PCMCIA is not set
Then you install pcmcia_cs and wireless-tools.
Now you set your options on /etc/pcmcia/wireless.opts and /etc/conf.d/net (at least in Gentoo these are the files you have to edit).
Just start the pcmcia service and see if it works. I can't give you more specific help, I'm afraid.