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You can connect an external switch to clear the CMOS. This switch
closes J6 and turns on the power, at which time the CMOS setup
will be cleaned.
Protect (default)
You can connect an LED to indicate when the CPU card is on. Pin 1
of J7 supplies power to the LED; 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
1
LED Power (+5 V)
2
No Connector
3
Ground
4
Keyboard lock
5
Ground
Clear CMOS
Chapter 2 Installation
27
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