Credit Read-In - IBM 29 Instruction Manual

Credit Read-in
• The program card coding indicates a left-zero field.
• The operator keys in the correct digits.
• The information is stored.
Description
The program card is multi-punched with a 7, 8, and 9
(program 2) in the high-order position, for example
column 40 ( see Figure 1-10). The rest of the field is
punched with 4' s defining the field. The operator keys
in the correct number of digits, then. presses the dash
key to start the punch-out including an 11 punch over
the digit in the units position. In our example, we key-
in one digit ( 5), and press the dash key to start
punching.
Read-in Cycle 1: The machine is at a left-zero field,
the program-select relay ( 308) is up. The 7, 8, and 9
starwheels energize the field 1, 2, and 3 relays ( 315,
324, 325), the field-size relays ( 209, 217, 226, 235, 216,
208, 218, 227), and the key-entry relay ( 304). The
P-cam-gate relay ( 309) is up.
The operator presses the correct key, closing a latch
contact. This energizes the correct relays in register 3A
through the field-size relay points, the key-entry relay
points, and the coding diodes. The punch clutch is
energized through the key-entry relay and coding
diodes. At 20° of the punch-clutch cycle, the keyboard
is restored. The correct relays in register 3B are ener-
gized at 86°. This transfers the information from regis-
ter 3A to register 3B. In
our example, we stored a 5 in
register 3B.
Circuit Objectives
1. Cycle 1 ( store a 5) :
Close numeric-5 latch contact.
Enter numeric information into register 3A and
energize the punch clutch.
Restore keyboard.
Transfer register 3A to 3B.
Retain information in register 3B.
11111111 1111111 111111 11111 1111 Ill II 1111111111111111111111111111111111111
~~~;;~~~[.t!~~~~~.tJ~!~~!.?J!!~~~l,!!~ii!~¥l,~!A!;.;;~~~;,;~;!~!!!~!!!!!!!!!~~~!~!~!!~
11111111111111111111111111111li1111&111~
1111111111111111111111111111111111111111
222222222 2222222 222222 2222212222222212222222222222222222222222222222222222222
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 313 3 3 3 3 3 3 3 3 3
I
3 3 3
I
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3;)
3?
3 3 3 3 3
4llllllll4lllllll4llllll4lllll4llll4lll4ll4lllllllllllllllllllllllllllllllllllll
55555555555555555555555555555555555555555515555555555555555555555555555555555555
16
6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
71
7 7
71
7 7
71 71 71
7 7
71 71 71 71 71
7177I7777I7 7 7 I 77 7
71
7
71
7 7 7 7 7 7 7
71
7 7 7
71
7
71 71 71
7
71 71
7
71 71
7
8 8 8 8 8 8 8 8
Bl
8 8 8 8 8 8 8 8 8 8 8 8 8 8
I
8 8 8 8 8
I
8 8 BBB BBB
I
BBB B 8 8 BB 8 BBB BBB BB 8 B 8 BBB B 8 8 BBB 8 8 8 BBB BB 8 BB
99999999999999999l999999l9999999999l999l9999999999999999999999999999999999999999
12345678910ttU~MIBIBD~~w~nnMH~VU~~~llUMH~~~~~~O~«O«~~~~~~~~~~E~~~~~~M~~~~~ronnnHHHnnn~
PM
5081
Figure 1-10. Left-Zero Program Card
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