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ASUS P4B533-V motherboard user guide
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South bridge controller. The fourth-generation Intel I/O Controller
Hub (ICH4) is a subsystem that integrates various I/O functions
including 2-channel ATA/100 bus master IDE controller, up to six
USB 2.0/1.1 ports, I/O APIC, SMBus 2.0 controller, LPC interface,
AC’97 2.2 interface, PCI 2.2 interface, and integrated LAN
controller. The ICH4 also contains the necessary arbitration and
buffering for efficient utilization of these interfaces.
Super I/O controller. 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), and a Flash ROM
interface.
Standby power LED. This 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.
DIP switches (DSW2). This 4-switch Dual Inline Package (DIP)
allows you to select the CPU frequency multiple.
Flash ROM. This 4Mb firmware contains the programmable BIOS
program.
ASUS ASIC. This chip performs multiple system functions that
include hardware and system voltage monitoring, IRQ routing,
among others.
Audio controller. This C-Media 6-channel PCI audio chip supports
legacy audio and HRTF 3D positional audio functions. The chip
also supports 24-bit S/PDIF In (0.5~5V) and S/PDIF Out (44.1K
and 48K formats) professional digital audio interface, and one
MPU-401 UART mode compatible MIDI/game port.
(on audio models only)
PCI slots. These six 32-bit PCI 2.2 expansion slots support bus
master PCI cards like SCSI or LAN cards with 133MB/s maximum
throughput.
AGP warning LED. Serving as a smart burn-out protection for the
motherboard, this red LED lights up if you plug in any 3.3V AGP
card into the AGP slot. When this LED is lit, there is no way you
can turn on the system power even if you press the power button.
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