Don’t judge each day by the harvest you reap but the seeds that you plant. Robert Louis Stephenson. Chapter 1 Introduction to Computers A World of Computers • What is computer literacy? – Knowledge and understanding of computers and their uses – Computers are everywhere p. 1.03 Fig. 1-1 Next What Is a Computer? • How is a computer defined? – Electronic device operating under the control of instructions stored in its own memory Accepts data Raw facts, figures, and symbols Processes data into information Data that is organized, meaningful, and useful Produces and stores results p. 1.04 Next What Is a Computer? • What is the information processing cycle? Input Process Output Storage Communication p. 1.04 Fig. 1-2 Next Components of a Computer • • • • • Input devices Output devices System Unit Storage devices Communication devices Two main components on the motherboard. Central Processing Unit (CPU) Also called a processor Carries out instructions that tell computer what to do Memory Temporary holding place for data and instructions p. 1.06 Next Why Is a Computer So Powerful? Storage Reliability Accuracy p. 1.08 Speed Communications Next Networks and the Internet • What is the Internet? – Worldwide collection of networks that connects millions of computers Click to view Web Link, then click Internet below Chapter 1 p. 1.09 Fig. 1-8 Next Computer Software • Two types – Systems software • Operating system (first company to use GUI?) • Utility programs – Applications software • Circuit City • Best Buy • Wal Mart Categories of Computers What are the categories of computers? Personal computers (desktop) Mobile computers and mobile devices Midrange servers Mainframe computers Supercomputers p. 1.16 Next Elements of an Information System • • • • • • Hardware Software Accurate data Trained information staff Knowledgeable users Documented prodedures • All elements of an information system must be present and work together to provide accurate, timely, useful information. • Only then, do you have an efficiently running information system.