Article 6330 of vmsnet.pdp-11:
Look in ftp.std.com/pub/jcomeau/hacking/otherstuff for forth.bld, the build
file for a hacked version of the original FIG-FORTH for the PDP-11. This
is being modified for better flexibility under the RSX11M operating system,
althought it SHOULD build properly for RT-11 or standalone use as well.
Some of the changes:

 * VLIST now works properly in an 8-bit environment
 * ERROR does not clutter the stack when input is from TI:
 * Can use with alternate .DAT files by setting taskname: for example,
   RUN FORTH/TASK=BLAH will open BLAH.DAT for input, if it exists.
 * Can specify initialization in the command line: for example,
   RUN FORTH/CMD="1 LOAD RUNAPP" can run an application compiled as RUNAPP
 * Separate LUNs for terminal input and output, stored as user variables
   to make output to other devices easy. For example, with LP0: assigned to
   LUN 4 using TKB,   : LLIST OUTLUN @ SWAP 4 OUTLUN ! LIST OUTLUN ! ;
 * Various minor code improvements

Changes I'm still working on:

 * Standalone version for RL02 systems (original FIG is for RX01/02)
 * Cleaning up the remainder of the code with "smart" macros
 * Including DAT file in the .BLD module, currently extra file FORTH.DAT
 * Inclusion of 83-standard changes, and ultimately ANS, with conditionals

After downloading, type @FORTH.BLD for more detailed instructions, or better
yet, read the source. Don't be confused by double <''>s, it has to be that
way for RSX's IND substitution to work properly.

-- 
jcomeau@world.std.com aka John Otis Lene Comeau
Home page: http://world.std.com/~jcomeau/
Disclaimer: Don't risk anything of value based on my advice.
"Anybody can do the difficult stuff. Call me when it's impossible."