In my experiments with DFORTH (see Adventures in Forth) I created some extensions and ported some of the TANFORTH extensions to work with DFORTH. They are published below in case they are of use to anybody.
CHUNKS is a word in TANFORTH used to access the chunky graphics. A version in DFORTH assembler is below as a text file.
CLS is another TANFORTH word that clears the screen and is missing from DFORTH This version by Alan Maunder
Screens 1 and 2 of TANFORTH contain useful graphics and random number routines. These versions have been tested with DFORTH.
Breakout was a game provided with TANFORTH it requires CHUNKS, CLS, Grpahics and random number extensions to load. This version has been modified for DFORTH