This directory contains the files that are needed by the PIC lexical analyser.
The lexical analyser is  table driven based on the scheme outlined in the 
following paper:

  Dedourek J.M, Gujar Uday G., "Scanner Design", Software-Practice and
  Experience, VOL. 10, 959-972 (1980).

The tables are maintained in two forms. The ".TAB" files are human-readable
while the ".CHR" are binary files which is what PIC loads in at the start of
execution. The program CTABLE.EXE can be used to convert the .TAB files to
.CHR files. This will be necessary, for example, if the table entries are 
changed or the .CHR files get corrupted. The program asks for the input (.tab)
and the output (.chr) files. You will need to run it twice, once for 
LEXNEXT.TAB and once for LEXOUT.TAB. 

**NOTE***
PIC loads the tables from the directory pointed to by the logical
"pic$tables". If you change the tables, make sure to move the new .CHR files
to whereever "pic$tables" directory is. 

You can use "LOOK.EXE" to look at the contents of the .chr files. The program
will prompt you for the .chr file and display its contents on sys$output.