The Free On-line Dictionary of Computing (30 December 2018):

KA9Q

    A popular implementation of TCP/IP and
   associated protocols for amateur packet radio systems and
   personal computers connected via serial lines.  It was
   named after the call-sign of Phil Karn - the radio ham who
   first wrote it for MS-DOS on the IBM PC.

   KA9Q is currently maintained by Anthony Frost
    (call-sign G8UDV) and Adam
   Goodfellow .  It has been ported
   to the Archimedes by Jonathan Naylor (G4KLX).

   [FTP?]

   (1994-11-08)