SadhTalk

The Computer for the 21st Century Mark Weiser The most profound technologies are those that disappear. They weave themselves into the fabric of everyday life until they are indistinguishable from it. Consider writing, perhaps the first information technology: The ability to capture a symbolic representation of spoken language for long-term storage freed information from the limits of individual memory. Today this technology is ubiquitous in industrialized countries. Not only do books, magazines and newspapers convey written information, but so do street signs, billboards, shop signs and even graffiti. Candy wrappers are covered in writing. The constant background presence of these products of "literacy technology" does not require active attention, but the information to be conveyed is ready for use at a glance. It is difficult to imagine modern life otherwise. Silicon-based information technology, in contrast, is far from having become part of the environment. Mor...

Computers – Hardware  Hardware Elements of Computers There are five core hardware components of the modern digital computer system: the central processing unit or CPU, memory, input devices, output devices, and a bus. While some components are given greater emphasis for a particular computer design (e.g., a faster CPU for computationally intensive tasks), virtually all types of computers have these five key components represented. Key Concept 2.1: Most of the hardware compoCore Computer Hardware nents in the modern digital com- Components puter are contained within small CPU modular semiconductor packages (integrated circuits [ICs] or chip) Memory that, in turn, contain millions of Input devices discrete components. Numerous Output devices ICs are interconnected on a large Bus circuit board, frequently referred to as the motherboard. The motherboard is interfaced with other outside components (e.g., disk drives, power supply, keyboard, network, etc.) using specialized cou...

BASIC CONCEPTS OF COMPUTER 1.1 INTRODUCTION A computer is a programmable machine designed to perform arithmetic and logical operations automatically and sequentially on the input given by the user and gives the desired output after processing. Computer components are divided into two major categories namely hardware and software. Hardware is the machine itself and its connected devices such as monitor, keyboard, mouse etc. Software are the set of programs that make use of hardware for performing various functions. 1.2 OBJECTIVES After going through this lesson you would be able to:  familiarise yourself with characteristics of computers  identify the basic components of a computer  explain the importance of various units of a computer  differentiate between system software and application software  explain the importance of operating system  get acquainted with open source  appreciate the need of computer security 1.3 CHARACTERISTICS OF COMPUTERS The characterist...

Analog Computer-   Analog computer handle or process information which is of a physical nature, as for example, Temperature, Pressure etc.  Digital Computer-   Digital computers process information which is essentially in a binary or two-state form, namely zero and one. When talking about computers we mostly refer to the digital type of electronic machines. These are based on the measuring of analog or equivalent physical value. Types of digital computer- Microcomputer Minicomputer Mainframe Supercomputer 1.Microcomputer-         Can be classified into- Desktop PCs Sits on desks, rarely moved, large and bulky. Memory capacity, graphics capacity and software availability vary from one computer to another used both for business and home applications. Advantages- Small size. Low cost. Portability. Low computing power. commonly used for personal applications. Disadvantages- Low processing speed. 2.Minicom...

Computer is a very versatile electronic machine Man has ever crated. Computer have made a great impact on our everyday life. Their presence is felt in almost every walk of life be it Home, School, College, Office, Industry, Hospital, Bank, Retail stores, Railways, Research and Design organizations etc.