Radio Shack TRS-80 Manual page 13

If
optional characters
are desired, please
contact
your
local
Radio Shack
store or
Computer
Center.
Details of Printer
Operation
The
Printer
starts a
Print cycle
under any
of
the following conditions.
(A)
Data buffer
receives
the
132nd
character.
Normal width
characters
and elongated characters can be sent together.
An
elongated character
is
counted
as
two
characters. In
case the
132nd
character
is
of elongated one, the elongated character
corresponding
to
the
132nd
(and 133rd) character
is
printed at
the
start
of
next
line.
In
the con-
densed
mode,
the buffer
will
still fill
and
dump
after
the
132nd
character.
Because the pitch (charac-
ters
per inch)
is
increased,
the
line
length decrease to
about
8.8" (22cm)
long.
(B)
When
print data for
at least
one
character
is
in
the buffer
and
carriage
return or
line
feed
code
is re-
ceived.
(C)
When
print data for at
least
one
character
is
in
the buffer
and the next data
is
not
received
within
approximately
one
second.
(D)
With normal or elongated
mode
specified,
when
condensed
character
command
is
received
(CHR$
(27);CHR$(14)).
•
In this
case after
all
data
in
the buffer
is
printed the carriage will
return to
beginning of the
line
before
printing the
condensed
characters
which
follow.
Without
special care
in
programming
insertion of
a
CON
STR command
in
the middle
of
a line will
cause over-printing of characters.
(E)
With condensed
mode
selected,
when
condensed
mode
cancellation
code
is
received
(CHR$
(27);
CHR$(15)).
•
In this
case
after
all
data
in
the buffer
is
printed,
the
carriage will
return to the beginning of the
line
before continuing to
print
the characters
which
may
follow.
Condensed
characters
should
not be combined
with other
modes
in
the
same
line
without
special
programming
care.
Note: While
in
the elongated character
mode
and
if
an elongated character
mode
code
is
re-
ceived, or
While
in
normal
character
mode
and an elongated character
mode
cancellation
code
is
is
received,
or
While
in
or
condensed character
mode
and condensed character
mode
code
is
received, or
While normal
character
mode
and condensed character cancellation
code
is
received.
When
a
CR
or
LF
code
is
received
and
after
completing operation,
a
second
CR
code
is
again received.
All
of the
above
under-lined (repetition of existing
states)
codes
will
be
ignored.
• Yoihcan
have
your
printer
changed
so that
CR
code
is
not ignored after receiving
CR
or
LF
code.
For
details,
see
your
nearest
Radio Shack
store or
Computer
Center.