KEY
OR
CONTROL
CLEAR
ESC
(Escape)
CTRL
(Control)
LF
(Line
Feed)
NEW
LINE
RETURN
Table 2-1. SUPER BEE Computer Terminal Keyboard,
Controls and Indicators (continued)
FUNCTION
CONTROL
AND
FUNCTION
KEY
GROUP (continued)
When the terminal
is
in the Character mode, all
memory
locations are reset
to
space
codes,
fill
t~b~a.cg
clfil!r~_g,
and cursor moves
to
the home position.
In the
Format
mode, all unprotected locations
of
the memory are reset
to
space
codes, and the cursor
is
moved
to
the
first
unprotected location in
the memory.
In the Program
Entry
mode, the code E
is
displayed
as
a reverse video
character and
is
not
acted upon.
Keyboard Operation: Depress
CLEAR
or
ESC,
E.
1/0 Port Operation: Receipt
of
ESC,
E.
Control key
that
generates the initial code in
an
escape
code sequence.
When pressed
with
any alpha key, the code structure
of
the alpha key
is
changed by forcing the seventh
bit
to
0.
This
allows operation
of
the
control codes assigned
to
columns one and
two
of
the ASCII Code Chart.
When the terminal
is
in the Character and
Format
modes, the cursor
is
positioned one line down in the
same
column
and the
SPOW
latch
is
reset
to
a destructive
space
bar.
If
the cursor's position in the
next
descending
line
would
be
beyond the end
of
the memory, then memory overwrite
will
occur, and the
first
line in the
buffer
will
be
lost. Also,
if
the terminal
has
been
configured
for
Automatic
Efficient
Paging, and the command preceding
the Line Feed
is
a
RETURN,
a NEW
LINE
code
will
be
stored and displayed
(strap
option)
at
the location in the memory where the cursor
was
located
when the
RETURN
was
generated.
In the Program
Entry
mode, the Line Feed
control
J symbol
is
displayed
and the cursor moves
to
the
next
descending character location in the buffer.
Keyboard Operation: Depress LF or CTR L-J.
1/0 Port Operation: Receipt
of
CTRL-J.
In
Character,
Format
and Program
Entry
modes, the special character
can
be
displayed
or
not
displayed; however,
it
will
be
stored in memory. The
SPOW
latch
is
reset
so
that
the
space
bar becomes destructive. When the
cursor
is
positioned beyond the NEW
LINE
character
of
a given line,
characters cannot be entered in the memory
nor
will
they
be
displayed.
Keyboard Operation: Depress NEW LI NE
or
CTR L-(underscore).
1/0 Port Operation: Receipt
of
CTR L-(underscore).
When the terminal
is
in Character and 1-ormat mode, the cursor
is
caused
to
reposition on the
first
character location
of
the current line. Return
sets
the
SPOW
latch
to
a non-destructive
space
bar.
In Program
Entry
mode, the code E
is
displayed and the cursor moves
to
the
next
descending character location in memory.
Keyboard Operation: Depress RETURN
or
CTRL-M.
1/0 Port Operation: Receipt
of
CRTL-M.
2-5
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