no idea really.. but some advice, you might want to check your kernel, and whether the support pcmcia networking is compiled/ modulised. If you haven't got the kernel source installed (this doesn't come with slack by standard) um... google for what kernel module you need for this card, and see if you have it with a modinfo [name of module] as root. Sorry, google's timing out for me right now, so i can't check myself.
Who says its unsupported, and who says it's supported in 2.4? It's possible that it's 2.4.22 you need, in which case you'll need to install the source from kernel.org and compile it. (see sig
Still, if it's said it's possible, it probably is.