Transaction Selection Switches; Control Keys - IBM 2790 Manual

Data communication system
Table of Contents

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Character
Card Punch
A
1 2 -1
B
1 2 - 2
C
12-3
D
12-4
E
12-5
F
1 2 - 6
G
12-7
H
1 2 - 8
1
12-9
J
11-1
K
1 1 - 2
L
11-3
M
11-4
N
11-5
O
11-6
P
11-7
Q
11 - 8
11-9
R
S
0 - 2
T
0-3
U
0-4
V
0-5
W
0-6
X
0-7
Y
0 - 8
Z
0-9
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
a
1 2 - 0 - 1
b
1 2 - 0 - 2
c
12-0-3
d
12-0-4
e
12-0-5
f
1 2 - 0 - 6
12-0-7
9
h
1 2 - 0 - 8
i
12-0-9
* Not transmitted
Figure 10.
Acceptable Area Station Character Set and Card Code
Badges are manually inserted (horizontally, face up,
guide-hole first). Badges that are inserted improperly are
not accepted. Properly inserted badges are retained at the
badge-reading station until completion of a correct trans­
mission. Data-transfer rate of the badge reader is approxi­
mately 100 characters per second.

Transaction Selection Switches

The transaction selection switches are ten pushbutton
switches located on the left front of the area station
18
EBCDIC
0123 4567
Hexadecimal
C l
1 1 0 0
000 1
C2
1 1 0 0
0 0 1 0
C3
1 1 0 0
0011
C4
1 1 0 0
0 1 0 0
C5
1 1 0 0
0 1 0 1
C6
1 1 0 0
0 1 1 0
C7
1 1 0 0
011 1
1 1 0 0
1 0 0 0
C 8
C9
1 1 0 0
1001
D1
1101
000 1
D2
1101
0 0 1 0
D3
1101
001 1
D4
1101
0 1 0 0
D5
1101
010 1
D6
1101
0 1 1 0
D7
1101
0111
D8
1101
1 0 0 0
D9
1101
1001
E2
1 1 1 0
0 0 1 0
E3
1 1 1 0
001 1
E4
1 1 1 0
0 1 0 0
E5
1 1 1 0
010 1
E6
1 1 1 0
0 1 1 0
E7
1 1 1 0
0 1 1 1
E8
1 1 1 0
1 0 0 0
E9
1 1 1 0
1001
F0
m
i
o o o o
FI
m i
o o o i
F2
n n
o o i o
F3
n n
o o n
F4
1111
0 1 0 0
F5
1111
0 101
F6
1111
0 1 1 0
F7
1111
0 111
F8
1111
1 0 0 0
F9
1111
1001
81
1 0 0 0
0 001
82
1 0 0 0
0 0 1 0
83
1 0 0 0
0 011
84
1 0 0 0
0 1 0 0
85
1 0 0 0
0 1 0 1
1 0 0 0
0 1 1 0
8 6
87
1 0 0 0
0 111
1 0 0 0
1 0 0 0
8 8
89
1 0 0 0
1001
Character
Card Punch
12-11-1
i
k
12-11-2
1
12-11-3
m
12-11-4
n
12-11-5
o
12-11-6
12-11-7
P
12-11-8
q
r
12-11-9
s
11-0-2
t
11-0-3
u
11-0-4
11-0-5
V
11-0-6
w
11-0-7
X
11-0-8
y
z
11-0-9
12-2-8
9
12-3-8
12-5-8
<
+
12-6-8
1
12-7-8
&
12
!
11-2-8
11-3-8
$
*
11-4-8
11-5-8
)
11-6-8
}
11-7-8
11
-
0-1
/
0-3-6
/
%
0-4-8
0-5-6
>
0-6-8
?
0-7-8
2-8
#
3-8
@
4-6
5-8
=
6-6
"
7-8
* EO C
12-4-8
* Blank
No Punch
(Figure 9). Selecting any of the first nine switches locks
the switches until the last switch (Release) is pressed.
Selection of any one of the first nine switches by the
operator generates an eight-bit character that identifies the
type of transaction chosen. The system controller can
assign (at the user's option) different meanings to each
switch based on the area station address.

Control Keys

The Area Station contains four special purpose control
keys: Enter, Clear, Next Guidance, and Monitor.
EBCDIC
0123 4567
Hexadecimal
1001 0001
91
1001 0010
92
1001 0011
93
1001 0100
94
1001 0101
95
1001 0110
96
1001 0111
97
1001 1000
98
1001
1001
99
1010 0010
A2
1010 0011
A3
1010 0100
A4
1010 0101
A5
1010 0110
A6
1010 0111
A7
1010 1000
A8
1010 1001
A9
0100 1010
4A
0100 1011
4B
0100 1101
4D
0100 1110
4E
0100 1111
4F
0101 0000
50
0101
1010
5A
0101
1011
5B
0101
1100
5C
0101
1101
5D
0101
1110
5E
0101
5F
n n
0110 0000
60
0110 0001
61
0110 1011
6B
0110 1100
6C
0110 1101
6D
0110 1110
6E
0110 1111
6F
0111
1010
7A
0111
1011
7B
0111
1100
7C
0111
1101
7D
0111
1110
7E
0111
1111
7F

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