Linked from
The 34 pages that link to Instruction set architecture, each with the reason it gives.
Stored-program computerRelated: It defines the instruction forms a stored program can contain.
Digital computerRelated: It defines the contract between a processor’s hardware and its programs.
Arithmetic logic unitRelated: Its instruction set determines which operations an ALU must support.
Computer (electronic device)Related: It specifies the machine-level operations software can command.
64-bit computingRelated: It defines which 64-bit operations and registers a processor exposes.