Basic structure of a digital computer The basic structure of a computer can be well described with the help of the figure-2. It consists of the CPU, the system bus and the peripherals all interconnected in some well-defined way to form a complete computer system. The CPU is the black box of the complete system doing all complex but useful tasks. It includes the arithmetic and logic unit for performing all operations of simple to complex arithmetic including scientific. Control unit and internal register is also part of the CPU.   System Bus: The system bus is basically a set of wire used to carry various information and control signal among various units inside the computer system. Depending on the type of information carried