I searched the threads here and noted a few references to wifi not working on the unsupported machine above.
This is interesting Stuart… It appears (as far as I can tell from what info you've provided) that you have the G4 867Mhz "Titanium" Powerbook there. What's interesting about that is, that machine is
not unsupported. It originally shipped with OS 9.2.2 and 10.1 - 10.3. Which 9.2.2 image did you use? (Not that it matters so much, but I'm curious to know if you booted the special "unsupported" image and it worked)
Second, assuming the machine identity is correct, then it originally had the wi-fi slot open and Airport was optional (extra $$). That would be original Airport 802.11b - not Extreme. So now, this is also interesting. You have an Extreme card that doesn't seem to work in OS9 but does in OSX. If so, then you're just lacking a proper Airport extension in OS9. The Airport software from OS9 may not be able to configure an Extreme card, or maybe it will - who knows? All you can do is try. If you can't make it work for lack of software, we've got another hack to think about…
Any Airport experts lurking around here?
AND…is your machine a Powerbook3,5 A1025 or something else?