Intel DQ57TM Intel Desktop Board DQ57TM Product Guide English - Page 33

Onboard Speaker, Real-Time Clock Subsystem, Wake from Serial Devices

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Desktop Board Features Wake from Serial Devices Serial port activity wakes the computer from an ACPI S1 or S3 state. Wake from PS/2 Devices PS/2 device activity wakes the computer from an ACPI S1 or S3 state. Onboard Speaker A speaker is mounted on the Desktop Board. The speaker provides audible error code (beep code) information during the Power-On Self-Test (POST). Refer to Appendix A for a description of the beep codes that may be generated during the POST. Real-Time Clock Subsystem A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with standby power applied by the power supply. NOTE If the battery and AC power fail, date and time values will be reset and the user will be notified during the POST. When the battery voltage drops below a certain level, the BIOS Setup program settings stored in CMOS RAM (for example, the date and time) might not be accurate. Replace the battery with an equivalent one. Go to page 65 for instructions on how to replace the battery. 33

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Desktop Board Features
33
Wake from Serial Devices
Serial port activity wakes the computer from an ACPI S1 or S3 state.
Wake from PS/2 Devices
PS/2 device activity wakes the computer from an ACPI S1 or S3 state.
Onboard Speaker
A speaker is mounted on the Desktop Board. The speaker provides audible error code
(beep code) information during the Power-On Self-Test (POST).
Refer to Appendix A
for a description of the beep codes that may be generated during the POST.
Real-Time Clock Subsystem
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory.
When
the computer is not plugged into a wall socket, the battery has an estimated life of
three years.
When the computer is plugged in, the standby current from the power
supply extends the life of the battery.
The clock is accurate to
±
13 minutes/year at 25 ºC with standby power applied by the
power supply.
NOTE
If the battery and AC power fail, date and time values will be reset and the user will be
notified during the POST.
When the battery voltage drops below a certain level, the BIOS Setup program
settings stored in CMOS RAM (for example, the date and time) might not be accurate.
Replace the battery with an equivalent one.
Go to page 65 for instructions on how to
replace the battery.