Asus P4B-LS User Manual

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Chapter 1: Product introduction

South bridge controller. Referred to as the Intel I/O Controller
Hub 2 (ICH2) of the Intel 845 chipset, this controller provides the
I/O subsystem that allows access to the rest of the system. The
ICH2 integrates I/O functions such as system bus interface, Ultra
ATA/100, Low Pin Count (LPC) interface, Universal Serial Bus
(USB) 1.1 interface, PCI interface, and CNR interface.

DIP switches. This 10-switch Dual Inline Package (DIP) allows you
to set the CPU external frequency.

Speech controller. This Winbond speech controller supports
ASUS POST Reporter™ for configurable vocal POST alerts.

Flash EEPROM. This 2Mb firmware contains the programmable
BIOS program.

Super I/O chipset. This Low Pin Count (LPC) interface provides
the commonly used Super I/O functionality. The chipset supports a
high-performance floppy disk controller for a 360K/720K/1.44M/
2.88M floppy disk drive, a multi-mode parallel port, two standard
compatible UARTs, a Standard Infrared (SIR), one MPU-401 UART
mode compatible MIDI/game port, and a Flash ROM interface.

ASUS ASIC. This chip performs multiple system functions that
include hardware and system voltage monitoring, IRQ routing,
among others.

LAN/SCSI slot. This ASUS proprietary slot supports the ASUS
LS99 LAN/SCSI card that allows you to connect up to 30 SCSI
devices, and hook your PC to a network.

CNR slot. This slot is specifically designed for the Communications
and Networking Riser (CNR) card. The CNR supports V.90 analog
modem, six-channel audio, HPNA, USB Hub, and the 10BASE-T/
100BASE-TX Ethernet networking.

Onboard LED. This onboard LED lights up if there is a standby
power on the motherboard. This LED acts as a reminder to turn off
the system power before plugging or unplugging devices.

PCI slots. These five 32-bit PCI 2.2 expansion slots support bus
master PCI cards like SCSI or LAN cards with 133MB/s maximum
throughput.

Audio/Modem CODEC. This AC ’97 compliant audio CODEC
supports SPDIF Out feature.