Operating system

When you turn on computer, it goes through several steps to prepare itself for use. the first is called  the Power on self test(POST). The computer identifies the devices attached to it, identifies the amount of memory available and does quick check to see whether the memory is functioning properly. This routine  is initiated by a part of the system software located in read-only memory(ROM), a chip that contains brief, permanent instructions for starting the computer.

Next, the computer looks for an operating system, which is usually stored in the hard disk. The operating system tells the computer how to interact with the user and how to use devices such as the disk drives, keyword, and monitor. When it finds the operations, the computer loads a portion of it into memory. Because the operating system is necessary for controlling the computers most basic functions, it continues to run until the computer is turned off.

After the computer finds and runs the operating system, it is ready to accept commands from an input device - usually the keyboard or a mouse - or from a program. At this point , the user can issue commands to the computer. A command might , for example, list the programs stored on the computers disk or make the computer run one of those programs.

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