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4023
Users
PROGRAMMING
(cont.)
Summary
of
ASCII
Code
Effect
on
the
4023
Code
translation
is
(Refer to
ASCII
Code
Chart):
127
10
(178
8
)
Does
not
write or
space.
0-31 10 (0-36
8
)
Control
characters. Specific control characters
used
by
the
4023
are indicated
in
Table
2-2, as well as
on
the
ASCII
Code
Chart.
32,o
(37
8
)
Non-displayable
SPACE
character.
33-126,0
(40-1
77
8
)
Printing
characters
which occupy
a character
space
in
Terminal
memory.
The
following
table
summarizes
the
ASCII code
effect
on
the
4023.
The
terminal
uses,
or otherwise
acts,
on
only
those
listed.
NOTE
Keying
control characters
from
the
keyboard
requires
two
(and
in
some
cases,
3)
key
closures.
In the
following
table,
a
superscript
C
followed
by
a
letter
character
indicates
that
the
control character
is
formed
by
simultaneously
pressing the
CTRL
and
indicated
letter
key.
A
superscript
C
and
S,
e.g.
cs
O,
indicates the
control character
(in
this
case,
US)
is
formed by
simultaneously
pressing the
CTRL
and
SHIFT
and
O
keys.
TABLE
2-2
ASCII
CODE EFFECT
Single
Character
Commands
ASCII
CONTROL
CHARACTER
KEYBOARD
KEY
COMBINATION
RESPONSE
ETX(3,
>
C
C
(normally
not
keyed
from
keyboard)
END OF
TEXT.
Functions
as a
Message Separator
when
stored
in
the
buffer.
It is
stored
when
the
computer
outputs
the
ETX
to
the
Terminal
as
the
last
character of the
computer
transmission, or
when
the operator types
C
C
or
presses
the
ENTER
key. Storage
is
suppressed
from
the
keyboard
if
there are
any
Field
Attribute
codes
in
memory.
BEL(7
10
)
C
G
Activates the
bell-like
tone
from
the
speaker.
BS(8,
)
Backspace
C
H
Backspace
-
a
format
effector.
Moves
the cursor to the
left
one
character.
If
the cursor
is
already
at
the
left
margin, the
BS
command
has
no
effect.
HT(9,
>
Tab
c
l
or
TAB
key
Horizontal Tabulate
—
a
format
effector.
In
Buffer
mode
with formatted
displays,
HT
tabs the cursor
one
character
space
beyond
the
FAC
that describes an
unprotected
field.
Used
to tab the cursor
from one
field
(any
field)
into
the
next input
field.
If
no
input
field
is
available,
the cursor
returns to the
Home
position.
In
DIRECT,
HT
performs
a
non-destructive
direct space,
i.e.
moves
cursor
right
one
space.
®
2-7
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