Radio Shack TRS-80 Operation Manual page 18

COPY
Same
function
as the
Copy
key
(see pg.
4).
27 34
(Dec.)
IB
22 (Hex.)
For example, L
PR
I
NT
CHR$(27)i
C H R
$(
3 4
) i
will
produce
a
copy
of
any
information
in the buffer
from
the
starting
point
where
CLEAR
was
pressed.
DOWNLOAD
Download
special drivers.
27 35
(Dec.)
IB 23
(Hex.)
This sequence causes
the
PTC-64
to
wait for a
new
program
to
be
sent
from
the
computer.
The program
sent should be
in
TRSDOS
load
file
format
(see
Appendix
C/
Downloading
Special
Drivers
for details).
IGNORE
Same
function
as pressing the
Copy
and Pause
keys together.
27 36
(Dec.)
IB 24
(Hex.)
This
sequence should be used
before
downloading
carriage positioning and
other special
printer
codes. Otherwise, the
printer
codes might be
misinterpreted
as
PTC-64
Control
Sequences.
All
Keys
on
the Printer Controller
will
still
be operative.
To
re-enable
Control
Sequences, you must
press the
CLEAR
and
COPY
keys
down
together, turn the
power OFF,
or execute the
self-test
(by pressing
the
CLEAR
and
PAUSE
keys
down
together).
For example,
after
sending
L
PR
I
NT
CHR$(27); CHR$
(
3G
)5
all
control
sequences
will simply be ignored
by
the
PTC-64
and
passed
on
to the printer.
Note:
If
you experience any
difficulty
while printing (particularly graphics), disable the
PTC-64
Control
Sequences by sending
the
IGNORE
sequence
or pressing the
COPY
and
PAUSE
keys
together.
PAUSE
Pause output
to printer.
27 37
(Dec.)
IB 25
(Hex.)
This sequence
is
similar
to
the
PAUSE
key
with the exception
that
you
may
only
stop
printing
by
using
this
sequence.
To
resume
printing
you must
press the
PAUSE
key on
the Printer Controller.
For example,
LPRINT CHR$(27)
5
CHR$(37)
»
will interrupt
any
printing
in
progress or stop
the
PTC-64
from
printing until the
PAUSE
key
is
pressed.
10