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Introduction Computer is a machine that can be programmed to accept data input process it into useful information output and stored it away in a secondary storage device for safekeeping or later reuse The processing input to output is directly by the software but performed by the hardware To function a computer system requires four main aspect of data handling 61656Input 61656Processing 61656Output 61656Storage Secondary Storage InputProcessing Output Figure 11 the hardware responsible for these four areas 61656Input devices accept data or commands in a form that computer can use they send the data or commands to the processing unit 61656The processor more formally known as Central Processing Unit CPU has electronic circuitry that manipulates input data into the information people want The Central Processing Unit actually executes computer instructions 61656Output devices show people the processed data-information-in understandable and usable form 61656Storage usually means secondary storage which consists of secondary storage devices such as disk-hard disk or diskettes or some other kind of disk-that can store data and programs outside of the computer itself These devices supplement memory or primary storage which can hold data and program only temporarily Input Getting data from the user to the computer Some input data can directly to the computer for processing Input in this category includes barcodes speech that enters the computer through a microphone and data entered by means of a device tat convert motions to one screen action Some input data however go through a good deal of intermediate handling such as when it is copied from a source documents jargon of originally written data and translated to a medium that a machine can read such as a magnetic disk In either case the task is to gather data to be processed by the computer-
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