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How does an Intel® Pentium® 4-based system with ICH2 use the internal APIC Controller?

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How does an Intel® Pentium® 4-based system with ICH2 use the internal APIC Controller?

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Pentium 4-based systems now follow the xAPIC protocol. With xAPIC, all transactions occur across Hublink Interface and Front Side Bus, not the previously dedicated three wire bus like in Pentium III-based system. For more information, please review Chapter 8 of the Intel® 64 and IA-32 Architectures Software Developer’s Manuals. This provides a description on how to use the xAPIC on a Pentium 4 system.

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