VISUAL
TECHNOLOGY
INCORPORATED,
RAILROAD
AVENUE,
DUNDEE
PARK,
ANDOVER,
MA
01810
READ
CURSOR:
Upon
receipt
of
the read cursor command the terminal
will
transmit
a
sequence defining
the
current position
of
the
cursor. In Visual
200
(VT
-52+)
mode,
full
duplex, the terminal sends Y parameter X parameter. In
half
duplex the
YX
will
be
fol-
lowed
by
a carriage return. I n
ADDS
520+ mode,
full
duplex, the
message
is
Y parameter
X parameter carriage return. I n
half
duplex
the
message
is
Y parameter X parameter
followed
by
a character defined
by
switches 5 and 6
of
the
left
bank
of
switches rear panel.
ADM
3A+
mode
uses
the
same
sequences
as
ADDS
520+ mode, however the X and Y
parameters are specified in
Appendix
III.
I n Hazeltine 1500+ mode the
read
cursor
message
is X parameter Y parameter carriage return. X and Y values
are
defined in
Appendix
V.
4.3
TAB
COMMANDS
TAB:
Moves the cursor
to
the
next
tab stop. In
each
emulation mode there are
two
types
of
tab stops, columnar and field. A field tab stop
is
defined
as
the
first
foreground location
following
a background location.
If
both
columnar and field tab stops
are
present the tab
command
will
stop
at
the columnar tab stops
only.
If
there
are
no tab stops on the screen
the tab command
will
be
ignored and the cursor
will
not
move. In Visual
200
(VT
-52+)
mode there are additional fixed preset tab stops
which
are
present on power on and
after
the reset
function.
These stops
are
at column positions
7,15,23,31,39,47,55,63,
and
71
through 79.
See
also paragraph 3.1.2.10.
BACK
TAB:
Moves
the
cursor
to
the
left
and up one tab stop. Back tab
can
be
generated
from
the keyboard
by
using the Tab and
Shift
keys.
See
also paragraph 3.1.2.10.
SET
TAB:
Set tab
sets
a columnar tab stop
0Wach
line in the column in which the cursor
is
located.
CLEAR
TAB:
Resets the columnar tab located in the column specified
by
the current
cursor
location.
All
other
tab stops are unaffected.
CLEAR
ALL
TABS:
This command clears all tab stops including the preset stops in Visual
200
(VT
-52+)
mode. Field tab stops located
after
background data are unaffected.
4.4
CLEAR
COMMANDS
All
clear commands clear all data
both
foreground and background. Foreground
or
back-
ground mode
will
be
retained.
CLEAR
LINE:
Clears all data on the entire line in
which
the cursor
is
located and places
the cursor at the
b!=!ginning
of
that
line. The
area
cleared
will
be
foreground
spaces.
CLEAR
PAGE: Clears all data on the entire screen
to
foreground
spaces
and places the
cursor at the home position.
CLEAR
END OF
PAGE-BACKGROUND:
Clears the
page
from
the cursor location
to
the
end
of
the screen
to
background
spaces.
The background/foreground mode set
prior
to
this
command
is
retained.
CLEAR
END OF
LINE:
Clears all data
from
the cursor position
to
the end
of
the line
to
foreground
spaces.
The cursor does
not
move.
CLEAR
TO
END OF PAGE: Clears all data
from
the cursor position
to
the end
of
the
screen
to
foreground
spaces.
The cursor does
not
move.
14
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