TODO:

catalog.pl -- mostly working
freemap.pl -- mostly working
dos33read.pl -- mostly working for simple text files
dos33write.pl -- in progress
dos33unlock.pl -- mostly working
dos33lock.pl -- mostly working
dos33rename.pl -- mostly working
dos33delete.pl -- in progress
dos33copy.pl -- started
zap.pl -- partially working
dos33undelete.pl -- started
dos33init.pl -- started