This is derived from the old, obsolete, and potentially buggy instruction set reference from the old Nasm Manual. The Nasm development team explicitly disclaims any responsibility for errors and omissions in this document!
This manual documents NASM, the Netwide Assembler: an assembler targetting the Intel x86 series of processors, with portable source.
Appendix A: x86 Instruction Reference
Section A.1: Key to Operand Specifications
Section A.2: Key to Opcode Descriptions
Section A.2.1: Register Values
Section A.2.2: Condition Codes
Section A.2.3: SSE Condition Predicates
Section A.2.4: Status Flags
Section A.2.5: Effective Address Encoding: ModR/M and SIB
Section A.2.6: Register Extensions: The REX Prefix
Section A.3: Key to Instruction Flags
Section A.4: x86 Instruction Set
Section A.4.1:
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