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Output Devices
Video Display Unit (VDU) or Monitor
Video Display Unit is similar to a television. It is used to display the results of processes. The screen is illuminated by a number of dots known as pixels. The number of dots per unit area is called resolution. The higher the resolution, the better will be the quality of the picture. A lighted symbol in a form of a line or rectangle visible on the screen known as Cursor, to indicate the position for typing a command. If any keys are pressed, it moves along the alphabet typed. A typical Video Display Unit screen can accommodate 25 lines, each line consisting of 80 characters.
Printers
There are various kinds of printers. They are basically divided into two categories:
Impact printers and Non-impact printers.
What is new? ERP, on the other hand begins with a fresh relook at the existing business. In fact it is the result of a happy marriage between Business Process Reengineering (BP
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There are two methods to work with files, the first one is through file control blocks or "FCB" and the second one is through communication channels, also identified as "handles".
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Simple Batch Systems: Early machines were very expensive, and therefore it was important to maximize machine utilization. To improve utilization, the concept of batch operat
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