Every computer system has a unit whose primary purpose is to process data. This unit is the control centre of the entire computer system. It accepts data from input devices, processes data, and sends results to the printer or other output devices under control of a stored program. This unit is referred to as the microprocessor in a microcomputer and the central processing unit (CPU) in large computer...

Computer has various peripheral devices such as: modem, vision systems, speech recognition and voice response devices, terminal etc. These parts make a computer very important and attractive instrument in our daily life. Using various peripheral devices of computer we can do many essential tasks easily. Terminal:  A terminal is a popular input/output device. Terminals are used for two-way...

We are familiar with various names of commuters such as Micro, Mini, Mainframe and Supercomputers. Here we have divided computers based on purposes, signals and capacity. At first we shall discuss the classification of the computers based on purposes. Classification based on purposes: There are either special-purpose or general-purpose computers. A special-purpose computer is designed for a...

From the fastest supercomputer and largest mainframe, right down to the smallest embedded microprocessor in a microwave oven or watch, every computer uses an operating system. Over the years, a variety of operating systems have been developed and many remain in use. When the IBM PC set the standard for microcomputers, DOS (Disk Operating System) become the most widely used microcomputer operating....

At the initial time of business computing, information system development was a muddled procedure commonly producing discouraging results. To progress the quality of information systems and services an approach for system development life cycle (SDLC) is developed. The system development life cycle can be considered in five phases. Each phase in intended to address key issues and to produce outcome,...

Many companies face shrinking budgets for software development. This means that the scale of investment in software projects are greatly reduced. This results in the need for shorter development times and lower manpower costs. With the increasing swing toward distributed systems, a new set of powerful visual tools is available. These tools bring with them a new approach towards system development....