B.13 Power LED and Keylock Connector (CN16)
You can use an LED to indicate when the CPU card is on. Pin 1 of CN16 supplies the LED's power, and Pin 3 is the ground.
You can use a switch (or a lock) to disable the keyboard so that the PC will not respond to any input. This is useful if you do not want anyone to change or stop a program which is running. Simply connect the switch from Pin 4 to Pin 5 of CN16.
Table
Pin | Function |
1 | LED power (+5 V) |
|
|
2 | NC |
|
|
3 | GND |
4 | Keyboard lock |
5 | GND |
B.14 External Speaker Connector (CN17)
The CPU card has its own buzzer. You can also connect it to the external speaker on your computer chassis.
Table
Pin | Function |
1 | +5 VCC |
2 | GND |
3 | Internal buzzer |
4 | Speaker out |
|
|
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