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+There are two filters in this package which are based on the Roland
+plotter command set.
+
+1. DXY: A simple command set which is used with all DXY plotters
+
+2. RD-GL: This command set is a superset of the HP (Hewlet Packard)
+   graphics language.
+
+Not all the commands of DXY or RD-GL (HPGL) are implemented (approx 95%
+are) and those commands that are not are skipped and a warning given.
+It is very easy to add to this filter if a particular unimplemented
+command is desired.
+
+If you wish to implement a command go to the relevant portion in the
+command switch "dxycom.c" or "hpglcom.c" and call an appropriate user
+written procedure.  (You will need a good knowledge of writing
+PostScript programs)
+
+The filters use the the procedure "getopt" which is used to interpret
+command line options and arguments and is normally available on 4.3 bsd
+and Sys V Unix. For those sites running 4.1 or 4.2 it may be available
+as a local library and must be written into the Makefile.
+
+IF YOU DONT HAVE GETOPT YOU WILL HAVE REWRITE THE CODE THAT INTERPRETS
+COMMAND LINE OPTIONS AND ARGUMENTS.
+
+NOTE 1: The method of writing text is not fully compatible with HPGL
+and will be changed at a later date.
+
+NOTE 2: The PostScript macros are written into a C procedure to allow
+each filter to be a single stand alone program. These macros can easily
+be incorporated into other filter programs.
+
+I have written some test procedures for the testing of each filter they
+are "test1.hpgl" for hpgl2ps and "test1.dxy" for dxy2ps.
+
+Don McCormick.
+