zc, kzc, and zipdata are all OS-9/68000 programs.  zc and kzc are 2
versions of ZipCode by Joel Mathew Hegberg (zc for termcap systems and
kzc for K-Windows systems).  Both require the data file zipdata.
zc and kzc allow the user to punch in a 5-digit zip code and it very very
quickly retrieves the city and state information.
 
  -- Joel Mathew Hegberg.