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Southbridge
Last modified: Wednesday, January 15, 2003 

In Northbridge/Southbridge chipset architecture designs, the Southbridge is the chip that controls all of the computers I/O functions, such as USB, audio, serial, the system BIOS, the ISA bus, the interrupt controller and the IDE channels. In other words, all of the functions of a processor except memory, PCI and AGP.

The Southbridge chip is one of two chips that control the functions of the chipset. The other is the Northbridge. The Northbridge can consist of more than one discrete chips while the Southbridge is typically only one discrete chip that rests on the Northbridge’s PCI bus.

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Hardware Central 
Detailed test reports on the latest desktop and laptop computers. Plus news on trend-setting products just coming into the pipeline.

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If the CPU is the brain of a personal computer, the motherboard is its nervous system.

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