VISUAL
TECHNOLOGY
INCORPORATED,
540
MAIN
STREET,
TEWKSBURY,
MA
01876
Enter Graphics Mode,
ESC
F
This sequence causes
the
terminal
to
enter Graphics mode. When Graphics mode
is
entered,
all
received lower-case ASCII codes (octals 137-172) and
the
ASCII codes for {,:,}and,....,
(octals 173-176) are displayed as graphic characters. Table 5-2 shows
the
graphic character
associated with each ASCII code.
Exit
Graphics Mode,
ESC
G
This sequence causes
the
terminal
to
exit
Graphics mode.
Cursor Home,
ESCH
This sequence causes
the
cursor
to
move
to
the
home position (upper left-hand corner of
the
screen).
Reverse
Line
Feed,
ESC
I
This sequence causes
the
cursor
to
move up one line
..
If
the
cursor
is
positioned on
the
top
line,
the
contents
of
the
screen
will
scroll down one line.
Erase
to
End
of
Screen,
ESC
J
This sequence causes erasure
of
all
data from
the
cursor position
to
the
end
of
the
screen.
Erase
to
End
of
Line,
ESC
K
This sequence causes erasure
of
all
data from
the
cursor position
to
the
end
of
the
line.
Cursor Addressing,
ESC
Y
This sequence
is
used for positioning
the
cursor on an absolute basis. The next
two
codes
following this sequence
will
be interpreted
as
the
new line and column positions respec-
tively. Table 5-3 shows
the
codes used for cursor addressina.
Identify,
ESC
Z
This sequence requests
the
terminal
to
verify
that
it
is
a VT-52 and
is
switched on and ready
for communication.
If
this
is
the
case,
the
terminal
will
respond with ESC/Z.
If
the
terminal
has
the
Printer Option installed, it will respond with ESC/M.
Enter
Alternate
Keypad Mode,
ESC
=
This sequence causes
the
terminal
to
enter Alternate Keypad mode. When entered, this
mode causes keys on
the
numeric keypad
to
transmit special escape sequences as opposed
to
their regular codes. The code sequence
generate~
by
each Key
is
summarized
in
Table 4-3.
Exit
Alternate
Keypad Mode,
ESC
>
This sequence causes
the
terminal
to
exit Alternate Keypad mode.
Enter
ANSI
Mode
ESC
<
This sequence causes
the
terminal
to
enter ANSI mode.
29
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