Hi!
Drop me a mail and I'll send you a howto by Bill Unruh that should get you up and going with the external modem. Serial interface, right? Then you actually don't need drivers - as far as I'm aware.
If you wan, mail me at spamnot@<removethis>polard.com and I'll mail it to you. Most Linux distros will already have what you need to use the modem with it.
Regards,
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