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CPU
Flash ROM(BIOS)
Super I/O
Serial PortParallel PortFloppy DiskKeyboardMouse
Northbridge
(memorycontroller hub)
Southbridge
(I/O controllerhub)
IDESATAUSBEthernetAudio CodecCMOS Memory
ClockGenerator
Graphicscard slot
High-speedgraphics bus(AGP or PCIExpress)
Chipset
Front-sidebus
Memorybus
Memory Slots
PCIBus
PCI Slots
LPCBus
InternalBus
Cables andports leadingoff-board