[cchp.README]

This directory contains the source code for driving the HP 7475A plotter with
Y-cable RS-232C interface using Calcomp-style subroutine calls.  The
subroutines create a plot file named 'hp_plot' that can be plotted with
'cat hp_plot'.  See the man page for details.

This works on a DEC VAX 11/750 running 4.3 BSD Unix.  Caveat hacker.

-- Rex Sanders, US Geological Survey
   rex@octopus.wr.usgs.gov
   Wed Mar 31 19:03:56 PST 1993