Asus AP1720-E1 - Manual (Page 44)

2-18 Chapter 2: Hardware information
2.7 Jumpers
1. Keyboard power (3-pin KBPWR1)
This jumper allows you to enable or disable the keyboard wake-up
feature. Set this jumper to pins 2-3 (+5VSB) if you wish to wake up the
computer when you press a key on the keyboard (the default is the
Space Bar).
2. CPU external frequency selection (3-pin J1)
These jumpers allow you to select your desired CPU external
frequency (or bus clock).
PC-DL
PC-DL Keyboard Power Setting
KBPWR1
(Default)
+5V +5VSB
1 2 2 3
PC-DL
PC-DL CPU External Frequency Selection
J1
CPU select
frequency
1 2
100MHz
3 4 3 4
5 6
(Default)
This feature requires a power supply that can provide 500mA on the
+5VSB lead. Otherwise the system does not power up.