Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 3A: System Programming Guide, Part 1 NOTE: The Intel® 64 and IA-32 Architectures Software Developer's Manual consists of nine volumes: Basic Architecture, Order Number 253665; Instruction Set Reference A-M, Order Number 253666; Instruction Set Reference N-U, Order Number 253667; Instruction Set Reference V-Z, Order Number 326018;