Radio Shack TRS-80 Owner's Manual page 63

?S^Si«3
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.
Note:
Files
created
by
DO
sometimes lose characters
if
you
try to
use
more
than
one
BASIC
statement (such
as
RUN, SAVE, LOAD,
etc.) in the
same
DO
file.
DUAL
Duplicate
Output
to
Video
and
Printer
DUAL
\SWiiCh)
switch
is
one
of
two
op/lions.
<.rn
or
off
I''
sirmfel
m?z^
v-
:
ie-$
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
)
fENTER)
47