DEBUG DUMPVAR <varname> - Prints the value of the specified variable. All array values are dumped.
DEBUG TRACEON - Dumps all source lines as they are executed.
DEBUG TRACEOFF - Switches Off the above.
DEBUG BAS9KON - Switches ON internal debugging output.
DEBUG BAS9KOFF - Switches OFF the above.
DEBUG WORDS - Prints a list of reserved words. Brackets indicates keyboard shortcuts ie type CTRL+L for LOAD.