Heretic,
Here's a product from Actiontec:
11Mbps Wireless PC Card adapter
Minimum System Requirements
Pentium 90 or Faster, Windows 95/98/98SE/ME/NT4/2000/XP, 16MB of RAM, PC Card Slot available (IEEE 802.11B, PCMCIA Spec. 5.1)
Costs about £25.
I'm not recommending it, just quoting it as an example of what's available.
There are several cards that I have seen that have a min. 400MHz CPU requirement, or only support Win 98 and above, but as you can see, it is possible to get cards that support your PC.
Try searching Google for "PCMCIA Wireless Network Adapter"
Over to you.
SD