Product Description
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1.8 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 3.3 VSB applied via the power supply 5 V STBY rail.
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 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. Figure 1 on page 15 shows the location of the battery.
1.9 Legacy I/O Controller
The I/O controller provides the following features:
• Two serial port headers
• One parallel port header with output only, bi-directional and Enhanced Parallel Port
(EPP) support
• Serial IRQ interface compatible with serialized IRQ support for PCI systems
• Intelligent power management, including a programmable wake-up event interface
The BIOS Setup program provides configuration options for the I/O controller.
1.9.1 Serial Ports
The serial ports, are implemented as two 10-pin headers on the board. The serial
ports support data transfers at speeds up to 115.2 kbits/sec with BIOS support.
For information about Refer to
The location of the serial port headers Figure 13, page 47
1.9.2 Parallel Port
The parallel port is implemented as a 26-pin header on the board. Use the BIOS Setup
program to set the parallel port mode.
For information about Refer to
The location of the parallel port header Figure 13, page 47
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