The central processing unit is the "brain" of the computer. All calculations, decisions and data moves are made here. The CPU has storage locations called registers. It has an arithmetic and logic unit (ALU) where the processing is done. Data is taken from the registers, processed and results go back into the registers. Move (MOV) commands are used to transfer data between RAM locations and the registers. There are many instructions, each with a specific purpose. This collection is called the instruction set.
