Advantech PCA-6143P User Manual page 18

You can connect an LED to indicate when the CPU card is on. Pin
1 of JP9 supplies power to the LED and Pin 3 is the ground. For
help finding JP9, refer to Chapter 1 (page 5).
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 of JP9. The pin assign-
ments for JP9 appear in the following table:
Pin Function
1LED Power (+5 V)
2No Connection
3Ground
4Keyboard lock
5Ground
You can connect a LED to connector JP1 to indicate when the
HDD is active. The pin on the top is positive.
You can connect a switch across the pins of jumper JP12 to change
the CPU between Turbo and non-Turbo mode. When you close
(short) the pins, the CPU card operates at full speed. When you
leave the pins open, the card operates at slow speed for compatibil-
ity with older software.
You can also switch the CPU back and forth between Turbo mode
and non-Turbo mode using the keyboard, but only when jumper
JP12 is open. When jumper JP12 is closed, the CPU is fixed in
Turbo mode. To switch into Turbo mode from the keyboard
simultaneously press the Ctrl, Alt and keypad plus (+) keys. To
switch into non-Turbo mode press the Ctrl, Alt and keypad minus
(-) keys.
18 PCA-6143P User's Manual