IA-32 Intel Architecture
Software Developer's Manual (2004 edition).
Local copies for faster download:
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Volume 1: Basic Architecture (3.1 MB)
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Volume 2A: Instruction Set Reference (A-M) (2.1 MB)
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Volume 2B: Instruction Set Reference (N-Z) (1.7 MB)
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Volume 3: System Programming Guide (5.5 MB)