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What is “Virtual Wire Mode B”, as mentioned in the ICH2 Specification Update, Specification Clarification 4?

April 26, 2017clarification ich2 mentioned specification

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What is “Virtual Wire Mode B”, as mentioned in the ICH2 Specification Update, Specification Clarification 4?

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Virtual Wire Mode B is a mode the ICH2 supports when using an external 8259A APIC in the system. If your system uses the internal xAPIC protocol and not an external 8259 APIC controller, then Specification Clarification 4 does not apply.