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ASUS P4B266-M motherboard user guide
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South bridge controller. Referred to as the Intel I/O Controller
Hub 2 (ICH2) of the Intel 845D 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.
ASUS ASIC. This chip performs multiple system functions that
include hardware and system voltage monitoring, power
management routing, among others.
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.
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.
CNR slot. This slot is specifically designed for the Communications
and Networking Riser (CNR) card. The CNR supports V.90 analog
modem, HPNA, USB Hub, and the 10BASE-T/100BASE-T Ethernet
networking.
Audio CODEC. This AC ‘97 audio codec provides stereo analog
I/O on the motherboard and peripheral devices to deliver high
quality audio to PC-connected speakers, headphones, and
microphones. The codec includes analog-to-digital and digital-to-
analog sample rate converters, as power amplifiers and
programmable gain blocks.
(on audio models only)
PCI slots. These three 32-bit PCI 2.2 expansion slots support bus
master PCI cards like SCSI or LAN cards with 133MB/s maximum
throughput.
LAN controller. This RealTek 8100 PCI LAN controller fully
supports 100BASE-TX Ethernet networking.
(on LAN models only)
AGP slot. This Accelerated Graphics Port (AGP) slot supports 1.5V
AGP4X mode graphics cards for 3D graphical applications.
Microphone jack. This Mic (pink) jack connects a microphone.
(on audio models only)
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