Intel AIMB-744 External speaker CN17, Reset CN18, HDD LED CN19, ATX soft power switch CN21

CN16 is a 5-pin connector for the power on LED. Refer to Appendix B for detailed information on the pin assignments. If a PS/2 or ATX power supply is used, the system's power LED status will be as indicated below:

Table 2.1: PS/2 or ATX power supply LED status

Power mode	LED (PS/2 power)	LED (ATX power)
System On	On	On
System Suspend	Fast flashes	Fast flashes
System Off	Off	Slow flashes

2.11.2 External speaker (CN17)

CN17 is a 4-pin connector for an extenal speaker. If there is no external speaker, the AIMB-744 provides an onboard buzzer as an alternative. To enable the buzzer, set pins 3-4 as closed

2.11.3 Reset (CN18)

Many computer cases offer the convenience of a reset button. Connect the wire from the reset button

1

2.11.4 HDD LED (CN19)

You can connect an LED to connector CN19 to indicate when the HDD is active.

1

2.11.5 ATX soft power switch (CN21)

If your computer case is equipped with an ATX power supply, you should connect the power on/off button on your computer case to CN21. This connection enables you to turn your computer on and off.

23 Chapter2