ICH - I/O Controller Hub
Short for I/O Controller Hub, ICH is an implementation of the Accelerated Hub Architecture (ACHA), often referred to as the Southbridge, a reference to the older, three-tier chipset design. It is the slower end of the ACHA, and most I/O devices are connected to the hub through it.
[Image Source: INSIDE THE PC, Nigel S. Smith, University of Cambridge Computing Service]
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