This allows to use opcodes instead of the number of the command. This was used in the early days of computing. Machine code can be written in different forms: This is used when talking about things that work on only some computers. Machine code is sometimes called native code. Program builders turn code into another language or machine code. Machine code is what assembly code and other programming languages are compiled to or interpreted as. An instruction set is a list of the opcodes used in a computer.

The operands are usually memory addresses. An instruction tells the computer to do one thing. All other kinds of software need to be translated into machine code before they can be used.Įach instruction is made up of an opcode (operation code) and operand(s).

This code is the lowest level of software. Their order tells the computer what to do. They can directly be executed by a processor. Machine code or machine language is the name for commands. Machine language monitor in a W65C816S single-board computer, displaying code disassembly, as well as processor register and memory dumps.

Writing program in machine language is