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You can connect an LED to indicate when the CPU card is on. Pin
1 of CN9 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
1
2
3
4
5
The CPU card has its own buzzer. You can disable the internal
buzzer and connect an external speaker to CN10. Enabling the
external speaker automatically disables the internal buzzer.
Pin
1
2
3
4
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Function
LED Power (+5 V)
No Connector
Ground
Keyboard lock
Ground
Function
Vcc
Speaker output
Buzzer in
Speaker output
Chapter 2 Installation
31
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