Chapter
1
Motherboard
Description
1-20
Reset Button
This connector can be attached to a momentary SPST switch. This switch is usually
open and when closed will cause the motherboard to reset and run the POST
(Power On Self Test).
Power LED Connector
This connector can be attached to an LED on the front panel of a computer case.
The LED will illuminate while the computer is powered on.
HDD LED (Hard Drive LED Connector)
This connector can be attached to an LED on the front panel of a computer case.
The LED will flicker during disk activity. This disk activity only applies to those
IDE drives directly attached to the system board.
IrDA (Infrared Connector)
This connector is used to attach to an infrared sensing device. After the IrDA
interface is configured, connectionless data transfer to and from portable devices
such as laptops, PDAs is possible.
Sleep Button (Green Button)
This connector is used to conserve energy by powering down the monitor and the
hard disk when not in use. To configure this option, you need to connect a button
from the front panel to this connector. Depressing the button will power down the
monitor and hard drives until the system is invoked by any keyboard activity,
mouse activity, modem activity or when the sleep button is depressed again. APM
(Advanced Power Management) must be enabled in the system BIOS and the APM
driver must be loaded.
Power Button
This connector can be attached to a front panel power switch. The switch must pull
the Power Button pin to ground for at least 50 ms to signal the power supply to
switch on or off. (The time required is due to internal debounce circuitry on the
system board). At least two seconds must pass before the power supply will
recognize another on/off signal.
