Radio Shack TRS-80 model III Owner's Manual page 54

Sample
Uses
Suppose you want
to set
up
the
following
trsdos
functions automatically
on
start-up:
FORMS (WIDTH=80)
CLOCK
(ON)
Then
use
build
to create
such
a
file.
If
you
called
it
begin, then use the
command; AUTO DO BEGIN
to
perform
the
commands
each time
trsdos
starts
up.
DUAL
Duplicate
Output
to
Video
and
Printer
TRSDOS
dual (switch)
'm^'h9MM^0^mf
on
or off.
If
omitted,
trsdos uses
on.
This
command
duplicates
all
video output
to the Printer,
and
vice versa.
It
takes
effect
immediately.
Notes:
1
.
Video and
printer
output
may
be
different
because of
intrinsic
differences
between
output devices
and
output software.
2.
Using
the
dual
command
will
slow
down
the
video output process.
3.
The dual
command
cannot be used during
route
and vice versa.
4.
The
printer
should be ready
when
you
execute the
command.
Sample Use
For a printed
copy
of
all
system/operator dialog, type:
DUAL
(ENTER)
To
turn off the
dual
process, type:
DUAL
(
OFF
)
(ENTER)
47