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Hardware
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CPU
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x86
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Instruction set
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Intel Architecture Software Developer's Manual by Intel (2008-11)
Software Developer's Manual - Vol 1 - Basic Architecture (November 2008)
Software Developer's Manual - Vol 3A - System Programming Guide, Part 1 (November 2008)
Software Developer's Manual - Vol 3B - System Programming Guide, Part 2 (November 2008)