hardware and software
A computer system consists of hardware and software. Hardware is the equipment, which makes up the computer system. Hardware consists of:- Input devices such as keyboard, mouse, joystick- Output devices such as a printer, monitor, graph plotter- Backing storage devices such as disc drive, hard drive- Media such as discs, tapes, paper etcA tracker ball mouse is an input device and similar to a mouse but the ball is set into a cup on the top of the unit. A finger or, on larger tracker balls the palm of the hand, is used to roll the ball in any direction. The ball controls the movement of the pointer on the screen. Buttons on the tracker ball work in the same way as mouse butons to activate processes on the screen. My alternative of using a mouse with a tracker ball would be a mouse without a tracker ball.· A tracker ball does not require a large flat surface.· Most people find them a bit fiddlyALTERNATIVE: Mouse without a tracker ballThe pointer on the monitor screen mirrors the movement of the mouse by the user's ha
Now days different types of keyboards are available in the market to meet the needs of the users for example ergonomic keyboard is more efficient for those users who suffer from the strain injury or for those who use a keyboard for long period of time. · Mistakes can be rectified easily. Under the mouse is a ball, which rolls as the mouse is moved. A concept keyboard is a flatbed of contact switches covered by a flexible membrane. Drawbacks:· The whole page cannot be viewed efficiently without first either zooming out or going into 'Print Preview'. Microsoft Word This program I cannot do without and is most important. · It has a layout that is easy to use and to see. No extra equipment needs to be bought. Benefits:· Can change size, font, colour and shape of text. Drawbacks:· It cannot be used to input text easily- you still need a keyboard to do that. APPLICATIONS: of a word processor· Writing letters, reports, lists and other documents in an office. They can also be use in hostile environments, for example, on North Sea oil platforms where the keyboard allows workers to use computer controlled machinery through the keyboard without it being damaged by salt spray or chemicals on the platform. · Performing calculations of data from which graphs can be drawn, e. · A variety of operations can be carried out on rows or columns. · It can produce graphs with one click of the mouse.
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