•
CAPS
LOCK
r;;l
~
VISUAL
TECHNOLOGY
INCORPORATED,
540
MAIN
STREET,
TEWKSBURY,
MA
01876
The
CTRL
key does
not
produce a code
by
itself.
It
is
depressed in
conjunction
with
other
keys
to
produce
the
control
codes
as
described in Section 5.2.
The
SHI
FT
key does
not
produce a code
by
itself. When depressed in conjunc-
tion
with
alpha-numeric keys,
it
causes
transmission
of
the
corre\ponding upper
case
alpha code
or
the
code whose symbol appears
on
the
upper part
of
the key.
Two
SHI
FT
keys are on the keyboard
for
operator convenience.
The CAPS LOCK key does
not
produce a code when depressed. This key enables
the
transmission
of
only
upper
case
alpha characters. The numeric and special
keys are
not
affected
by
the
CAPS LOCK key.
The NO
SCROLL
key alternately transmits
the
XOFF
(DC3) and XON (DC1)
control
codes,
if
the
Auto
XON/XOF
F SET-UP feature
is
enabled. These codes
are
used
to
stop/start transmissions
from
the host computer, provided the host
recognizes these codes.
If
the
Auto
XON/XOFF
feature
is
disabled,
the
NO
SCROLL
key
will
transmit
no codes.
NOTE
When
the
Auto
XON/XOFF
feature
is
enabled, the NO
SCROLL
key
will
be
synchronized
with
the
use
of
XON/XOF
F codes generated
by
the terminal.
Example
TAB
I RETURN I
r;:;;;;i
~
•
•
•
•
Host's transmission
causes
terminal's Fl FO
buffer
to
become almost
full
causing
terminal
to
automatically
transmit
XOF
F.
If
the
operator
now
depresses the NO
SCROLL
key, no
XOF
F code
is
sent .
Buffer
empties, no XON sent .
Operator
depresses
NO
SCROLL,
XON sent .
Depressing the
TAB
key
causes
transmission
of
the
HT
control
code (octal 011),
and
causes
the cursor
to
advance
to
the
next
tab stop.
Depressing
the
BACKSPACE key
causes
transmission
of
the
BS
control
code
(octal 010), and
causes
the
cursor
to
move one position
to
the left.
Depressing the
RETURN
key
causes
transmission
of
the
CR
control
code
(octal 015), and
causes
the cursor
to
move
to
the
first
column
of
the present line.
If
the
New Line'feature
is
enabled, the
RETURN
key
will
transmit
the
CR
and
LF
control
codes, and
will
cause
the cursor
to
move
to
the
first
column
of
the
next
line.
Depressing the
LINEFEED
key
causes
transmission
of
the
LF
control
code
(octal 012) and
causes
the cursor
to
move
down
one line.
22
To Next Page
Loading...
