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x86 Assembly Language
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be incomplete or broken in various obvious or non-obvious ways. Refer to Intel® 64 and IA-32 Architectures Software Developer’s Manual for anything serious.
Arm Instruction Set Architecture
Just some hard links to the official documentation.
RISC-V Assembly Language
The RISC-V Instruction Set Manual is organized into the following volumes:
Volume I: User-Level ISA
Volume II: Privileged Architecture