The south bridge is an integrated circuit on the Motherboard that is responsible for the hard-drive controller I/O controller and integrated hardware such as sound card video card if present on the motherboard USB PCI IDE BIOS and Ethernet. The south bridge gets its name for common being south of the PCI bus.
Although the south bridge handles a lot of the I/O devices, slower and less prominent input/output devices, such ass the serial port keyboard, and Non USB Mouse are handed by the super Input/Output.
Note: Some newer chip set are combing the south bridge and super I/O chip in o a single chip and reffering to this chip as the super south bridge chip. some manufacturers such as Nvida and SIS have ever combined the north bridge south bridge and super Input/Output in to a single chip.
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