Fundamentals of Information Systems, Sixth Edition

1. Fundamentals of Information Systems, Sixth Edition Chapter 2 Hardware and Software

2. Principles and Learning Objectives • Computer hardware must be carefully selected to meet the evolving needs of the organization and its supporting information systems • Identify and discuss the role of the essential hardware components of a computer system • Identify the characteristics of and discuss the usage of various classes of single-user and multiuser computer systems Fundamentals of Information Systems, Sixth Edition

3. Principles and Learning Objectives (continued) • The computer hardware industry and users are implementing green computing designs and products • Define the term green computing and identify the primary goals of this program Fundamentals of Information Systems, Sixth Edition

4. Principles and Learning Objectives (continued) • Systems and application software are critical in helping individuals and organizations achieve their goals • Identify and briefly describe the functions of the two basic kinds of software • Outline the role of the operating system and identify the features of several popular operating systems Fundamentals of Information Systems, Sixth Edition

5. Principles and Learning Objectives (continued) • Organizations should not develop proprietary application software unless doing so will meet a compelling business need that can provide a competitive advantage • Discuss how application software can support personal, workgroup, and enterprise business objectives • Identify three basic approaches to developing application software and discuss the pros and cons of each Fundamentals of Information Systems, Sixth Edition

6. Principles and Learning Objectives (continued) • Organizations should choose a programming language whose functional characteristics are appropriate for the task at hand, considering the skills and experience of the programming staff • Outline the overall evolution and importance of programming languages and clearly differentiate among the generations of programming languages Fundamentals of Information Systems, Sixth Edition

7. Principles and Learning Objectives (continued) • The software industry continues to undergo constant change; users need to be aware of recent trends and issues to be effective in their business and personal life • Identify several key software issues and trends that have an impact on organizations and individuals Fundamentals of Information Systems, Sixth Edition

8. Why Learn About Hardware and Software? • Organizations invest in computer hardware to: • Improve worker productivity • Increase revenue, reduce costs • Provide better customer service • Managers: • Are expected to know enough about their business needs to be able to ask tough questions Fundamentals of Information Systems, Sixth Edition

9. Computer Systems: Integrating the Power of Technology • To assemble an effective and efficient system: • You should select and organize components while understanding the trade-offs between overall system performance and cost, control, and complexity • Hardware objectives are: • Subordinate to, but supportive of, the information system and the current and future needs of the organization Fundamentals of Information Systems, Sixth Edition

10. Hardware Components • Central processing unit (CPU): • Arithmetic/logic unit, the control unit, and the register areas • Arithmetic/logic unit (ALU): • Performs mathematical calculations and makes logical comparisons • Control unit: • Sequentially accesses program instructions, decodes them, and coordinates the flow of data in and out of the ALU, registers, primary storage, and even secondary storage and various output devices Fundamentals of Information Systems, Sixth Edition

11. Hardware Components (continued) Fundamentals of Information Systems, Sixth Edition

12. Processing and Memory Devices: Power, Speed, and Capacity • System unit: • Houses the components responsible for processing (the CPU and memory) • All other computer system devices: • Are linked either directly or indirectly into the system unit housing Fundamentals of Information Systems, Sixth Edition

13. Processing Characteristics and Functions • Clock speed: • Series of electronic pulses produced at a predetermined rate that affects machine cycle time • Often measured in: • Megahertz (MHz): millions of cycles per second • Gigahertz (GHz): billions of cycles per second • Physical characteristics of the CPU • Most CPUs are collections of digital circuits imprinted on silicon wafers, or chips, each no bigger than the tip of a pencil eraser Fundamentals of Information Systems, Sixth Edition

14. Memory Characteristics and Functions • Memory: • Provides the CPU with a working storage area for programs and data • Rapidly provides data and instructions to the CPU • Storage capacity: • Eight bits together form a byte (B) Fundamentals of Information Systems, Sixth Edition

15. Memory Characteristics and Functions (continued) Fundamentals of Information Systems, Sixth Edition

16. Memory Characteristics and Functions (continued) • Types of memory: • Random access memory (RAM): • Temporary and volatile • Read-only memory (ROM): • Nonvolatile • Provides permanent storage for data and instructions that do not change Fundamentals of Information Systems, Sixth Edition

17. Multiprocessing • Multiprocessing: • Simultaneous execution of two or more instructions at the same time • Multicore microprocessor: • Combines two or more independent processors into a single computer Fundamentals of Information Systems, Sixth Edition

18. Multiprocessing (continued) • Parallel computing: • Simultaneous execution of the same task on multiple processors to obtain results faster • Grid computing: • Use of a collection of computers to work in a coordinated manner to solve a common problem Fundamentals of Information Systems, Sixth Edition

19. Secondary Storage and Input and Output Devices • Secondary storage: • Compared with memory, offers the advantages of nonvolatility, greater capacity, and greater economy • Considerably slower than memory Fundamentals of Information Systems, Sixth Edition

20. Access Methods • Sequential access: • Data must be retrieved in the order in which it is stored • Devices used called sequential access storage devices (SASDs) • Direct access: • Records can be retrieved in any order • Devices used are called direct access storage devices (DASDs) Fundamentals of Information Systems, Sixth Edition

21. Secondary Storage Devices • Magnetic tapes: • Primarily for storing backups of critical organizational data • Magnetic disks: • Direct-access storage device • Redundant array of independent/inexpensive disks (RAID): • Method of storing data that generates extra bits of data from existing data • Virtual tape: • Storage technology for less frequently needed data Fundamentals of Information Systems, Sixth Edition

22. Secondary Storage Devices (continued) • Storage area network: • Uses computer servers, distributed storage devices, and networks to tie everything together • Optical discs: • Common form of optical disc on which data cannot be modified once it has been recorded • Digital video disc (DVD): • Storage medium used to store software, video games, and movies Fundamentals of Information Systems, Sixth Edition

23. Secondary Storage Devices (continued) • Solid state secondary storage devices: • Store data in memory chips rather than magnetic or optical media • Have few moving parts, so they are less fragile than hard disk drives • Disadvantages of SSD: • High cost per GB of data storage • Lower capacity compared to current hard drives Fundamentals of Information Systems, Sixth Edition

24. Input Devices • Devices used to input general types of data: • Personal computer input devices • Speech recognition technology • Digital cameras • Touch-sensitive screens • Optical data readers • Magnetic ink character recognition (MICR) devices • Pen input devices • Magnetic stripe card • Radio Frequency Identification Fundamentals of Information Systems, Sixth Edition

25. Input Devices (continued) Fundamentals of Information Systems, Sixth Edition

26. Output Devices • Display monitors: • Used to display the output from the computer • Plasma display: • Uses thousands of smart cells (pixels) consisting of electrodes and neon and xenon gases that are electrically turned into plasma to emit light • LCD displays: • Flat displays that use liquid crystals • Organic light-emitting diodes (OLEDs): • Use a layer of organic material sandwiched between two conductors Fundamentals of Information Systems, Sixth Edition

27. Output Devices(continued) • Printers and plotters: • Two main types of printers are laser printers and inkjet printers • Plotters are a type of hard-copy output device used for general design work • Digital audio player: • Can store, organize, and play digital music files • E-books: • Digital media equivalent of a conventional printed book Fundamentals of Information Systems, Sixth Edition

28. Computer System Types • Computer systems: • Can range from desktop (or smaller) portable computers to massive supercomputers that require housing in large rooms Fundamentals of Information Systems, Sixth Edition

29. Computer System Types (continued) Fundamentals of Information Systems, Sixth Edition

30. Computer System Types (continued) Fundamentals of Information Systems, Sixth Edition

31. Portable Computers • Handheld computers: • Single-user computers that provide ease of portability because of their small size • Laptop computer: • Personal computer designed for use by mobile users • Notebook computers: • Lightweight computer that weighs less than 5 pounds Fundamentals of Information Systems, Sixth Edition

32. Portable Computers (continued) • Netbook computer: • The smallest, lightest, least expensive member of the laptop computer family • Tablet computers: • Portable, lightweight computers with no keyboard • Smartphone: • Combines the functionality of a mobile phone, camera, Web browser, e-mail tool, MP3 player, and other devices Fundamentals of Information Systems, Sixth Edition

33. Nonportable Single-User Computers • Thin client: • Low-cost, centrally managed computer with no extra drives • Desktop computers: • Single-user computer systems that are highly versatile Fundamentals of Information Systems, Sixth Edition

34. Nonportable Single-User Computers (continued) • Nettop computer: • Inexpensive desktop computer designed to be smaller, lighter, and consume much less power than a traditional desktop computer • Workstations: • More powerful than personal computers but still small enough to fit on a desktop Fundamentals of Information Systems, Sixth Edition

35. Multiple-User Computer Systems • Server: • Used by many users to perform a specific task, such as running network or Internet applications • Blade server: • Houses many computer motherboards • The approach requires much less physical space than traditional server farms Fundamentals of Information Systems, Sixth Edition

36. Multiple-User Computer Systems (continued) • Mainframe computer: • Large, powerful computer shared by hundreds of concurrent users connected to the machine over a network • Supercomputers: • The most powerful computers with the fastest processing speed and highest performance Fundamentals of Information Systems, Sixth Edition

37. Green Computing • Concerned with: • Efficient and environmentally responsible design, manufacture, operation, and disposal of IS-related products • Goals: • Reduce the use of hazardous material • Enable companies to lower their power-related costs • Enable the safe disposal or recycling of some 700,000 tons of computers each year Fundamentals of Information Systems, Sixth Edition

38. Overview of Software • Computer programs: • Sequences of instructions for the computer • Documentation: • Describes program functions to help the user operate the computer system • Types of software: • Systems software • Application software Fundamentals of Information Systems, Sixth Edition

39. Supporting Individual, Group, and Organizational Goals • Sphere of influence: • Scope of problems and opportunities addressed by a particular organization • Personal sphere of influence: • Serve the needs of an individual user • Personal productivity software: • Helps users improve their personal effectiveness • Workgroup: • When two or more people work together to achieve a common goal Fundamentals of Information Systems, Sixth Edition

40. Supporting Individual, Group, and Organizational Goals (continued) • Workgroup sphere of influence: • Serves the needs of a workgroup • Enterprise sphere of influence: • Supports the firm in its interaction with its environment Fundamentals of Information Systems, Sixth Edition

41. Installing and Removing New Software • Before you can use any type of software, it must be installed on a computer • Software for personal computers typically comes on CDs or is downloaded from the Web Fundamentals of Information Systems, Sixth Edition

42. Systems Software • Includes: • Operating systems • Utility programs Fundamentals of Information Systems, Sixth Edition

43. Operating Systems • Set of programs that controls computer hardware and acts as an interface with application programs • Can control one computer or multiple computers, or • Can allow multiple users to interact with one computer • Combinations of OSs, computers, and users: • Single computer with a single user • Single computer with multiple users • Multiple computers with multiple users • Special-purpose computers Fundamentals of Information Systems, Sixth Edition

44. Operating Systems (continued) Fundamentals of Information Systems, Sixth Edition

45. Operating Systems (continued) • Activities performed by the operating system: • Perform common computer hardware functions • Provide a user interface and input/output management • Provide a degree of hardware independence • Manage system memory • Manage processing tasks • Provide networking capability • Control access to system resources • Manage files Fundamentals of Information Systems, Sixth Edition

46. Operating Systems (continued) • Common hardware functions: • Get input from keyboard or another input device • Retrieve data from disks • Store data on disks • Display information on a monitor or printer Fundamentals of Information Systems, Sixth Edition

47. Operating Systems (continued) • User interface and input/output management: • User interface: • Allows individuals to access and command the computer system • Command-based user interface: • Requires that text commands be given to the computer to perform basic activities • Graphical user interface (GUI): • Uses icons and menus displayed on screen to send commands to the computer system Fundamentals of Information Systems, Sixth Edition

48. Operating Systems (continued) • Hardware independence: • Application program interface (API): • Allows applications to make use of the operating system • Memory management: • Allows computer to execute program instructions effectively and to speed processing Fundamentals of Information Systems, Sixth Edition