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the codes used for the host port (refer to paragraph
3.15.14).
3.15.15 X-ON, X-OFF Control
The Model 950 automatically transmits X-OFF to the
host, which requests the host to stop sending data when
the terminal's receive buffer is almost full (less than 16
characters). When the data in the buffers is processed
(output to the screen or to the printer buffer), the Model
950 automatically transmits X-ON to the host, which in-
dicates that the host may resume sending data to the ter-
minal (refer to paragraph 3.15.5). The X-ON, X-OFF
feature may be enabled or disabled with the following
Control sequences:
Enable X-ON, X-OFF CTRL 0
Disable X-ON, X-OFF CTRL N
3.15.16 User ROM.
The Model 950 allows the user to install custom pro-
grams contained in ROM (refer to the Model 950 Cus-
tomizing Instructions). To command the terminal to exe-
cute the program, enter
ESC
z
p
where p
=
an optional
parameter
defined in the
user's ROM.
If
the user ROM is not installed, the command will be ig-
nored.
3.15.17 Line Lock.
The Model 950 features a line lock function that locks
the line at the cursor position into screen memory. The
line remains locked until cleared. The line also remains
fixed in position, on the screen regardless of the action of
the remainder of the screen data (such as scrolling).
Multiple lines may be locked in any order or sequence;
however, no more· than 23 of the 24 lines on a page may
be locked. Once the line lock function is cleared, scroll-
ing will cause all lines on the page to scroll normally. The
line lock function may be used to set up a stationary data
field while other screen data scrolls past. It may also be
used to perform block moves of text. To control the line
lock function, use the following code sequences:
Enable Line Lock
ESC ! 1
Disable Line Lock
ESC ! 2
3.15.18 Wraparound Feature
The Model 950 contains a wraparound feature, in which
entered text automatically advances to column 1 of the
next line when column 80 of the previous line is reached.
Because of this feature, the first LF entered after wrap-
ping past column 80 (but before any text is entered) will
be ignored by the terminal. Ignoring this LF prevents a
double linefeed when the terminal receives 80 characters,
CR, LF, 80 characters, CR, LF, and so forth.
3.15.19 Video Display Control
The Model 950 features a video display control function
that turns the screen on or off. The function may be used
to blank the screen while the host is building a form or
writing a long data list. To control the video display in
this manner, use the following codes:
Screen on
ESC n
Screen blank
ESC
0
3.15.20 Reference Tables
Following this paragraph, in order, are Table 3-2, Model
950 US ASCII Chart; Table 3-3, Model 950 Cursor Ad-
dressing Codes; and Table 3-4, Model 950 Control
Codes. Also included are Tables 3-5 through 3-9, which
provide the hex codes associated with each key of the
Model 950.
Tabl e 3-2 US ASCII Chart
~
.
00
00
0,
0 1
1 0
1 0
1 1
1 1
6
•
0
1
0
,
0
1
0
1
B.
b5
.
..
Its
~4~31~;jbt'~
0
1
2
3
4
5
6
7
o
0
o
0
0
NUL
OLE
SP
0
@
p
...
p
o
0
o
1
1
SOH
DC1
!
1
A
Q
a
q
o
0 1 0
2
STX
DC2
II
2
B
R
b
r
o
0 , 1
3
ETX
DC3
#
3
C
S
C
5
o
1
o
0
4
EOT
DC4
S
4
0
T
d
t
o
1
o
1
5
ENQ
NAK
%
5
E
U
e
u
o
1 1 0
6
ACK
SYNt
&
6
F
V
f
v
o
1 1 1
7
BEL
ETB
,
7
G
W
9
w
1 0
o
0
8
BS-- CAN
(
8
H
X
h
x
1 0
o
1
9
SKIP
EM
)
9
I
Y
i
y
HT
1 0 1 0
10
LF
SUB
*
:
J
Z
j
z
1 0 1 1
11
VT+
ESC
+
;
K
[
k
{
1 1
o
0
12
FF--
FS
<
L
\
I
I
,
I
1 1
o
1
13
CR
GS
-
=
M
1
m
}
1 1 1 0
14
SO
HOME
RS
.
>
N
/\
n
, . "
1 1 1 1
15
SI
NEW LINE
/
?
0
DEL
US
-
0
RUB
3-24
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