Peripherals are parts added on to the computer to allow it to do special tasks. A printer is a peripheral. Usually home computers make this connection by using a peripheral called a modem . Computer instructions are written in a code that contains only zeros and ones. This is called binary code .
Electricity entering the computer first goes into the power supply .
Operating Systems are codes that control the computer drives. The Disk Operating System for PCs is commonly called DOS . Every computer can understand at least one operating language. At present, the computer world is divided into two different types of machines, PCs and Macs. In the past, the machines could each only understand their own operating language.