Real-Time Clock, Cmos Sram, And Battery; I/O Controller; Serial Port; Parallel Port - Intel D845GEBV2 - OCTOBRE 2002 Manual

1.8.4 Real-Time Clock, CMOS SRAM, and Battery

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.
✏
NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS
RAM at power-on.

1.9 I/O Controller

The SMSC LPC47M172 I/O controller provides the following features:
•
One serial port
•
One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port
(EPP) support
•
Serial IRQ interface compatible with serialized IRQ support for PCI systems
•
PS/2-style mouse and keyboard interfaces
•
Interface for one 1.44 MB or 2.88 MB diskette drive
•
Intelligent power management, including a programmable wake-up event interface
•
PCI power management support
The BIOS Setup program provides configuration options for the I/O controller.
For information about
SMSC LPC47M172 I/O controller

1.9.1 Serial Port

The boards have one serial port connector located on the back panel. The serial port supports data
transfers at speeds up to 115.2 kbits/sec with BIOS support.
For information about
The location of the serial port A connector

1.9.2 Parallel Port

The 25-pin D-Sub parallel port connector is located on the back panel. Use the BIOS Setup
program to set the parallel port mode.
For information about
The location of the parallel port connector
Setting the parallel port's mode
Product Description
Refer to
http://www.smsc.com
Refer to
Figure 12, page 60
Refer to
Figure 12, page 60
Table 58, page 101
35