VISUAL
TECHNOLOGY
INCORPORATED,
RAILROAD
AVENUE,
DUNDEE
PARK,
ANDOVER,
MA
01810
4. OPERATION
4.1
GENERAL
This section contains detailed
information
on the operation
of
each
of
the commands and
functions
of
the Visual 200. I n
each
of
these discussions the remote command code
sequence
has
been
omitted.
Appendix
I details these sequences
for
the standard Visual 200,
and
for
each
of
the emulations.
4.2 CURSOR
COMMANDS
CURSOR HOME:
Places
the cursor
to
the
left
margin
top
line when in
page
mode. In
Scroll
mode,
ADDS
520+ and
ADM
3A+
emulations Home
is
the
left
margin
bottom
line.
CURSOR UP:
Moves
the
cursor vertically up one line. In all modes except
ADDS
520+ mode
the cursor
will
not
move beyond the
top
line. In
ADDS
520+ mode the cursor
will
wrap
from
the
top
line
to
the
bottom
line. In
ADM-3A+
mode
with
scroll enabled, this key trans-
mits
Control
K.
Control
K in scroll mode
will
not
move the cursor up, however
ESC
A
will.
CU
RSO
R DOWN: Moves
the
cursor vertically
down
one line. I n Visual
200
(VT
-52+)
and
1500+ mode the cursor
will
not
wrap beyond
the
bottom
line,
nor
will
the screen scroll. In
ADDS
520+ and
ADM
3A+
mode
the
cursor
will
wrap
from
the
bottom
line
to
the
top
line
in
page
mode,
or
it
will
cause
the screen
to
scroll when in scroll mode.
CURSOR
RIGHT:
In Visual 200
(VT
-52+)
and
ADM
3A+
mode the cursor
will
move one
position at a
time
to
the
right
until
thlmargin
is
encountered where
it
will
remain. In
ADDS
520+ mode the cursor wraps
to
the beginning
of
the
next
line
each
time
the
right
margin
is
encountered. In Hazeltine 1500+ mode cursor
right
moves the cursor
to
the right
one position wrapping
from
the end
of
one line
to
the beginning
of
the
next
line
until
the
last position
of
the
last line
is
reached. The cursor remains at this location ignoring
further
cursor right commands.
See
also paragraph 3.1.2.10. In
ADM-3A
mode
with
scroll enabled,
this key transmits
Control
L. Control L in scroll mode
will
not
move the cursor right, how-
ever
ESC
C
will.
CURSOR
LEFT:
Moves the cursor one position
to
the
left.
In Visual
200
(VT
-52+)
and
ADM
3A
modes the cursor
will
not
wrap beyond the
left
margin
of
any line. In
ADDS
520+ mode the cursor
will
wrap
from
the
left
margin
to
the
right
margin
of
the line above.
I n Hazeltine 1500+ mode the cursor
will
wrap in the
same
manner
as
in the
ADDS
520+
mode, however
it
will
remain in the
first
position
of
the
top
line once this location
is
en-
countered.
See
also paragraph 3.1.2.10.
UP
SCROLL:
This command
will
cause
the cursor
to
move up one line at a
time
until
it
reaches the
top
line.
At
this
point
subsequent commands
will
cause
the screen
to
scroll
down
one line. The
top
line
will
be
erased
and the
former
bottom
line
is
lost.
CURSOR ADDRESS:
This command sequence places
the
cursor
to
a directed location on
the screen.
In Visual
200
(VT
-52+)
mode the sequence
is
ESC
Y
YX
where
YX
are the
location parameters specified in
Appendix
III.
In Hazeltine 1500+ mode the
format
is
~
DC1
XY
where
XY
are the location parameters specified in
Appendix
V. The
format
for
ADM
3A+
mode
is
ESC
=
YX.
Y and X parameters are defined in
Appendix
III.
I n
ADDS
520+ mode the cursor address
format
is
ESC
Y
YX.
See
Appendix
IV
for
the values
of
X
and
Y.
ADDS
520+ mode also
has
a vertical cursor address sequence
(VT
parameter) and a
horizontal cursor address sequence
(DLE
parameter). The parameters
for
vertical and
horizontal position are defined in
Appendix
IV.
13
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