Writing Device Drivers: JT FAX 4800

[Guy Lemieux]

I'm thinking on writing a device driver for the Hayes (formerly Quadram)
JT FAX 4800 baud fax card.    

Does anybody have a device driver for this already?  If not, is it difficult
to write a device driver for Xenix?  I'm running Xenix/386 2.3.2GT.

Can someone send me some sample device driver code that I may use as a
skeleton?

Thanks in advance,
Guy
guy at contact.uucp