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IBM
978
CARD
COUNTING
UNIT
77
Figure 56. Counter Magnet Normal
holes 9 through 2 has been completed, the tube or
tubes in conduction pick the memory relays. Having
picked the memory relays, the tubes are extinguished
to allow them to be conditioned by the next card on
Remove for
230V Input
Alternate Wiring
for 230V Input
131415
16 17 18
the following cycle. Memory of holes read in the card
is thus transferred from a tube to a relay. Tube mem-
ory is not necessary when holes 1, 0, 11, and 12 are
read in the card; in this case the tubes fire and imme-
diately pick the memory relays. The tube and relay
chassis is located under the stackers.
On the second cycle an impulse
to
the counter net-
work through the transferred memory relay points
energizes counter magnets, adding a 1 into the counter
corresponding to the digit read.
CIRCUITS
Power Supply
The power supply is located in the motor compart-
ment. Two transformers are used in the power supply
to provide the necessary voltages for machine operation.
The transformers may be wired for an input of 115,
208, or 230 volts
AC.
Both have two primary windings,
wired in parallel for an input of 115 volts
AC
or wired
in series for 230 volts (Figure 57).
082 Term. 15
082 Term. 16
T·37
T·38
T·39
0--0
T-40
0--0
T-41
~
T-42
Figure 57. Power Supply
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