3 . 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) 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 1A on the +5VSB lead, and a corresponding setting in the BIOS.
KBPWR1
+5V +5VSB (Default)
P5P800-MX Keyboard power setting
1.10Connectors
1.10.1 Rear panel connectors
4
5
6
1 . PS/2 mouse port (green). This port is for a PS/2 mouse.
2 . Parallel port. This 25-pin port connects a parallel printer, a scanner, or other devices.