Appendix A/ Special Characters - Radio Shack TRS-80 Operation Manual

Appendix
A/
Special
Characters
The PTC-64
provides 16
special characters
upon power-up.
To
use them,
you must
first
send
the
TRANSLATE
control sequence (27
38).
This sequence
is
used
initially to
enable the special characters.
Any
time
after
this,
you
can
specify
any
number
in the
144
to
159 range
for selecting a
particular special character.
When
using the special characters,
it
is
necessary
to
use
a printer
with
Bit
Image
capabilities.
You
can use any of
the
following
TRS-80
printers:
LP7,
or
8,
DMP
100,
110, 120,
200, 400, 420, 500, or 2100, and
the
CGP-220.
(If
you do
not
have
a graphics
printer, special characters will print as
X X X X
X.)
The
following
is
a
list
of
the default special characters:
Decimal
Hex.
Value Value
Special
Character
144 90
a
145
91
y
146 92
n
(double width)
147
93
'"
148 94
£•
149
95
150
96
M-
151 97
TT
152
98
P
153 99
TT
154
9A T
155
9B
T
156
9C
i
157
9D
;C
158
9E
iVs
159 9F
7
li
£
(double width)
For example,
LPR
I
NT CHR$
<
27
) i
CHR$
(
38
) i
enables
the
16
special characters.
Later on,
if
you
specify
CHR$(
144),
<* will be printed.
But
if
you
specify
L P R
I
N T
CHR$(
157),
x
will
be
printed.
You may
specify
any
other
number
for selecting the
desired special character.
It is
only necessary
to
send
the
TRANSLATE
sequence
once.
From
that
point on, any of
the special characters
may
be chosen.
Note: Double
width
characters
occupy
the
space of two normal
special characters.
Redefining
Special
Characters
The PTC-64
offers the option
of
redefining special characters to
let
you
create
your
own
symbols.
You may
redefine
any
of the default special characters
—
those
in the
144
to
159 range.
When
you do
so,
the old character(s) will
be
erased.
However,
if
you
turn the
power
OFF,
or perform
the
self-test,
the original 16 special characters will be
re-established.
The
general
format
for character redefinition
from
BASIC
is:
LPRINT CHR$(27)5 CHR$<39)5 CHR$(n/)»
CHR$(»2)
, .
,CHR*(nX)
5
13