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Chapter 1: Product introduction
2. USB device wake-up (3-pin PS2_USB_PWR)
This jumper allows you to enable or disable the keyboard wake-up feature. Set this
jumper to pins 2-3 (+5VSB) to wake up the computer when you press a key on the
keyboard (the default is the Space Bar). This feature requires an ATX power supply
that can supply at least 500 mA on the +5VSB lead, and a corresponding setting in
the BIOS.