Radio Shack 26-1145 - Page 25

Keys pressed
Code
at Address
Default
Code
shifH
,
A
shift
J
,
B
shift!
,C
shift!
,
D
50B9H
50
BAH
50BBH
50BCH
03H
=
EOT
1BH
=
ESC
FCH=
1
FFH
=
DEL
TABLE
8.
KEYBOARD
OUTPUT CODES
To
generate
any
of these
codes
it is necessary
to:
(1)
hold down
the 'shift'
key,
(2)
hold
down
the
"
I
"
key..
(3)
press
A, B,
C or D.
The
keys
may
be released
in any
order.
Other standard
control
codes
can be
generated
in the
same
way,
with
E through
O generating
05H
through
0FH
and P
through
Z
generating
10H
through
1SH
(you can
test
this by
generating
08H
shift
!
,H for
a back
space).
If the default
special
codes are
not appropriate,
load
TBUG
LEVEL
II
via the SYSTEM
command
in BASIC
(use the
Reset push
button)
and
enter the desired codes
into 50B9 through
50BCH.
Use TBUG
to re-enter
TERM
by a jump to 5000H. Note
that TERM
is located
at 5000H
through 50BC
so
that
it can be resident in
RAM
along
with
TBUG.
HINTS and NOTES
1
.
Shorting
pins
2 and 3 of the RS-232-C
connector
is a
good way
to test
programs
and
hardware.
2.
In
data
communications,
problems will readily
occur
if you
have
incorrectly
set
the
even/odd
parity, parity
enable,
baud
rate, terminal/data set,
(input/output
correspondence
with
pins 2 and
3,
etc.).
3. The TERM
program
does not check
for the various
error
status flags
provided with
the RS-232-C
hardware
such
as
parity error,
overflow, etc. If
you are
a skilled
programmer,
you will
be pleased
to know
it is
possible to use TBUG
to
make use
of this
ignored information
in various
applications.
22