x86 Manuals
Main Intel Manuals
IA-32 Intel Architecture Software Developer's Manual Volume 1: Basic Architecture
IA-32 Intel Architecture Software Developer's Manual Volume 2A: Instruction Set Reference, A-M
IA-32 Intel Architecture Software Developer's Manual Volume 2B: Instruction Set Reference, N-Z
IA-32 Intel Architecture Software Developer's Manual Volume 3: System Programming Guide
Full Intel Documentation