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Circuit Obiectives
1. Cycle 1 (energize interposer 0 magnet) :
Close left-zero latch contact.
Energize punch clutch and read-out relay ( 326).
Prevent transfer of information in registers.
Provide a hold on the information in registers.
Provide a special hold for register lA.
Provide a continuous restore to the keyboard.
Energize interposer magnet.
Energize punch-out relay ( 317).
Drop key entry ( 304) and field 1, 2, and 3 relays
( 315, 324, 325).
Energize escape magnet.
Energize escape-interlock relays.
Energize punch clutch.
2. Cycle 2 (punch a 0 and energize interposer 0 mag-
net.
Transfer B-registers to next A-registers.
Hold lA register until 10° next cycle.
Transfer A-registers to B-registers.
Hold B-registers' information until next cycle.
Energize interposer magnets.
Energize escape magnet.
Energize escape-interlock relays.
Energize punch clutch.
3. Cycle 3, 4, 5, 6 and 7:
These cycles are similar to cycle 2.
4. Cycle 8 (punch a 7 in column 16 and energize inter-
poser 8 magnet) :
Transfer B-registers to next A-registers.
Hold register IA information until 10° next cycle.
Energize escape magnet.
Energize escape interlock relays.
Energize punch clutch.
Break starwheel 12 or 4 contact.
5. Cycle 9 (punch an 8 in column 17) :
Drop punch-out relay ( 317).
Drop read-out relay ( 326).
Open circuit to keyboard-restore magnets.
Left-Zero Credit Field
To indicate a credit field, the operator keys in the
information just as in a debit field. To start the read-
out, punch-out operation, the operator presses the
dash (-) key instead of the left-zero key. Pressing the
dash key causes a credit ( 11 punch) in the units col-
umn to be punched above the units digit.
1-11
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