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Dedicated Switclt Cireuit
The ded icated switche s have the same circuit as the matrix row switche s. The dedicated sw itch
circuit operate s the same as in the switch matr ix circuit . When a ded icated switch is closed the
circuit is driven low . Since the other side of the switch is tied to ground, the microproces sor
recognizes the switch as being closed .
DEDICATED GROUND (example)
CPU Board
CPu
Board
r --- -- -,
I
P lay field
I
J205 I
I J205
I
I
ROW (example)
,---- -----------
+5V
+12V
74LS2 40
c
Switch A
H L Off
L H On
B C
Open H
Closed L
Power Circuit
The power for the
CPU
is supplied by the Power Driver Board . The inputs for +12v and +5V are on
J210 .
3-7
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