>As has been mentioned before, you need a packet "TNC".  Check out any of
>the Amateur Radio suppliers in magazines such as "73", "CQ" or "QST".  Most
>of these mags have book order desks and lists of books on packet radio.
>
Try Tuscon Area Packet Radio website.  I think it is www.tapr.org

Regards,
Robert Wheeldon
'90 V8Q
Principal Engineer
Boeing Commercial Airplane