The notion of an instruction set architecture (ISA) defines and specifies the behavior and encoding in memory of the instruction set of the system, without specifying its exact implementation. ![]() ![]() Each instruction causes the CPU to perform a very specific task, such as a load, a store, a jump, or an arithmetic logic unit (ALU) operation on one or more units of data in the CPU's registers or memory.Įarly CPUs had specific machine code that might break backwards compatibility with each new CPU released. In computer programming, machine code is any low-level programming language, consisting of machine language instructions, which are used to control a computer's central processing unit (CPU). Machine language monitor in a W65C816S single-board computer, displaying code disassembly, as well as processor register and memory dumps.
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