11ASUS ASIC. This chip performs multiple system functions that include hardware and system voltage monitoring.

12South 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.

13AGP 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.

14Standby power LED. This green LED lights up if there is a standby power on the motherboard. The LED acts as a reminder to turn off the system power before plugging or unplugging devices.

15Audio CODEC. The C-Media CMI9738 is an AC’97 2.1 compliant audio CODEC designed for PC multimedia systems.

(on audio models only)

16PCI slots. These three 32-bit PCI 2.2 expansion slots support bus master PCI cards with 133MB/s maximum throughput.

171394 controller. The TSB43AB21 is an integrated 1394a-2000 controller that is fully compliant with 1394 Open Host Controller Interface (OHCI) specification 1.1. This device allows data transfers between the 33MHz PCI bus and the 1394 bus at 100Mbps, 200Mbps, and 400Mbps through a 1394 port. It also provides PCI bus master bursting, and is capable of transferring a cacheline data at 132MB/s to support digital electronic devices. The TSB43AB21 is fully interoperable with FireWire and i.LINK implementations of IEEE Std 1394. (on 1394 models only)

18AGP slot. This Accelerated Graphics Port (AGP) slot supports 1.5V AGP4X mode graphics cards for 3D graphical applications.

19LAN PHY. This Intel 82562ET LAN PHY works with the integrated MAC in the South Bridge (ICH4) to fully support 10BASE-T/ 100BASE-TX Ethernet networking. (on LAN models only)

20PS/2 mouse port. This green 6-pin connector is for a PS/2 mouse.

ASUS P4B533-M motherboard user guide

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