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4~6
6~8
8~10
10~12
12~14
14~16
You can connect an LED to indicate when the CPU card is on.
Pin 1 of JP12 supplies power to the LED and Pin 3 is the ground.
You can use a switch (or a lock) to disable the keyboard. In this
state the PC will not respond to any input. This is useful if you
don't want anyone to change or stop a running program. Simply
connect the switch between Pins 4 and 5. The pin assignments
appear in the following table:
Pin
Function
5
LED Power (+5 V)
4
No Connector
3
Ground
2
Keyboard lock
1
Ground
The CPU card has its own buzzer. You can disable the internal
buzzer and connect an external speaker to JP13. Enabling the
external speaker automatically disables the internal buzzer.
D
C
B
A
9
8
20~22
22~24
24~26
26~28
28~30
30~32
5
4
3
2
1
0
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