Radio Shack TRS-80 Model III - Page 35

OPERATION
Text Characters
The
Model III Display can produce
the standard ASCII text characters,
including the
upper and lowercase alphabet.
All text characters
are created on an eight-by-eight matrix for
excellent definition.
The
following BASIC program will display
all 96 text codes and characters:
10 CLS
20 FOR
I
=
32 TO
127
30
PRINT a
(1-32) *
8, I
40
NEXT
I
CHR*(
I)
;
Many
of these characters can
be
keyed
in
directly
from the keyboard; others
can
only
be generated
by
reference to their
ASCII codes.
Note: The
QD
key
is echoed
on
the
display as
[
instead of as an
up-arrow. This is
because Model III
produces standard ASCII characters on its
display. However, if
the program calls
for an up-arrow , the left-bracket will serve the
same purpose.
Graphics Characters
The
Model III Display has
64
graphics
characters, consisting of all
possible on-off
combinations in
a
two-by-three matrix:
The
graphics characters are produced
by
codes 128
through 191 . The following
program will display them all:
10 CLS
20 FOR
I
=
128
TO
191
30 PRINT
a
(1-128) *
8,
40
NEXT
I
CHR*<I)
;
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