Here are some elementary directions for the use of .4TH files with
your F83 system.
       Many files in the directories of the ECFB contain the extension-.4TH.
These are text files containing Forth code.  They may or may not be com-
pilable by your F83, depending upon whether or not your dictionary contains
all of the words used.  In any event here is a technique which you may use
to convert these 4TH files to BLK files:
      Some of these files contain a lot of blank lines, which will extend
the length of your BLK file unnecessarily.  TRIM.COM can be used to remove
all the blank lines from a text file.  CHOP1.BAT has been designed for this
purpose. The syntax is CHOP1 <filename> with no extension given.  However
the file changed must have the extension .4TH.
      The 4TH files may also have screen headings, which may begin with
FILE:.  These lines would suspend the loading of any source code.  Put the
file in an editor and make a global replacement of FILE: with \ FIL.  While
it's in the editor be sure there are 16 lines prior to any source code and
that there are enough blank lines at the end so that the last part of the
source code won't be truncated. (F83 truncates any lines beyond the multiple
of 16.)
     The most important step in the process is to invoke the elegant
little utility called SCREENS-.COM.  It will convert the text file to a
Forth block file.
     At this point if the text file was written in the F83 vocabularies,
you're home free.  If not, attempting to load it will show you which words
you need to look for.  The load instruction may also need to be changed
slightly to fit the number of screens that you came up with.
     One very fine program you can convert with this technique is LINDLY.4TH.
     Enjoy.