If we analyze our PC as a machine it has many complicated circuits and it has many hardware components like hard disk, RAM, CD ROM, DVD driver, monitor, mouse, keyboard and CPU. When we go to buy a PC we can either buy PC which is fully assembled having all the essential hardware components like monitor, CPU, keyboard and mouse or we can buy an unassembled system. The unassembled system allows us to buy a central processing unit of different company, separate mouse and a keyboard of different brand. The range and variety of all primary PC components is so much that we can change them every week. The development has not yet stop now there are wireless keyboards and laser mice available in the market. The development in the computers have also replaced many components like in laptops the screen and the mouse is attached in one single machine.


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