The wireless adapter in this thing is an equally old Realtek PCMCIA card. I suspect WPA2 encryption is beyond it's capabilities. I do, however, have a nearly new Linksys AE1200 USB adapter in my collection of miscellaneous stuff, so I gave it a shot. It's not even detected. My guess is that it requires USB2 (says so on the box), and I believe this old machine only has USB1.
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00:07.2 USB controller: Intel Corporation 82371AB/EB/MB PIIX4 USB (rev 01)