VISUAL
TECHNOLOGY
INCORPORATED,
RAILROAD
AVENUE,
DUNDEE
PARK,
ANDOVER,
MA
01810
I n
ADM
3A+
mode this switch enables the
space
over data function rather than the auto
LF
on
CR
function. When
set
ON
the
space
code
is
normally destructive
(erases
any data
at the cursor
location)
until
a carriage return code
is
received: The
CR
code
will
move the
cursor
to
the
left
margin
of
the current line
and
change the
space
function
to
nondestruc-
tive.
Spaces
received
will
move the cursor
to
the right
without
erasing data (effectively a
cursor right function)
until
a line feed character
is
received, at which
point
the line feed
is
executed and the
space
function
is
returned
to
the destructive mode. With this switch
OFF
the
space
will
remain in the destructive mode, carriage return and line feed codes
will
be
performe,.d normally.
3.1.2.10
Auto
Net Line
One switch (2
left
bank) enables the
Auto
New Line function.
When
set, the cursor
will
proceed
to
the first position
of
the next line
after
the
80th
character
is
entered. When
disabled, the cursor
will
remain in the 80th character position, overwriting this location
with
subsequent data
until
it
is
moved by carriage return, line feed,
or
cursor command.
Cursor right, tab and back tab functions wrap when this switch
is
set.
3.1.2.11 Data
Terminal Ready
One switch
(1
left
bank) provides a switchable Data Terminal Ready function when revision
E
or
later
PCB
is
installed. When this switch
is
off,
DTR
will
switch
with
Line/Local. When
this switch
is
on, DTR
will
be true
as
long
as
the terminal
is
powered on, independent
of
Line/Local.
3.2
SLIDE
CONTROLS
3.2.1 General
Two
slide controls
are
located on
the
bottom
of
the terminal
to
the
left
rear. The forward
control adjusts the high intensity brightness. The rear control adjusts the
low
intensity
brightness. Both
controls are
set
such
that
minimum
brightness
is
achieved
with
the con-
trols slid toward the operator. Upon power on, the high intensity brightness
is
set
first
using
data entered
from
the keyboard. El1tering
half
intensity mode and entering data
will
allow
the adjustment
of
low
intensity brightness.
3.3
KEYBOARDS
3.3.1 General
Two
standard keyboards
are
available on the
VISUAL
200. Figure 3-2 details the
layout
for
the keyboard
without
function
keys and the keyboard
with
function
keys. The terminal
is
also functional
as
a
read
only
device.
When
the keyboard
is
not
present the terminal
is
initialized
to
the on line state.
Any
time
any rear panel
is
altered on a
read
only
configura-
tion
it
will
be
necessary
to
power
off
the terminal and power
it
on in order
to
insure
that
the
new switch setting
has
been
recognized.
All
keys except
BRK,
ON, ESC, RST,
CP
and
CL
have
the
type-o-matic feature. This
feature
automatically repeats the selected character
for
the length
of
time
the key remains
depressed after
an
initial delay
of
.75 seconds at a rate
of
10 characters per second (110
baud)
or
15 characters per second (150 baud
or
higher). Figures 3-3
and
3-4 detail
the
codes transmitted
by
each
key in
each
of
the modes
of
operation.
8
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