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lecture:Operating Syste Ms


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created by yeswanth.presentation on history of operating systems, Windows-7 and some more advantages of operating systems..........

created by yeswanth.presentation on history of operating systems, Windows-7 and some more advantages of operating systems..........

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  • 2. Operating system
    • Program used to control computer, link between user and internal working of computer and programs
  • 3. Why We Need Operating Systems
    • An OPERATING SYSTEM is a PROGRAM which acts as an interface between the user and the hardware to:
    • 1. Facilitate convenient access to hardware by the user
    • 2. Improve efficiency of the system
    • 3. Provide security of the system and its program and data
    • 4. Emulate features not available in hardware
  • 4. User Views of Operating System
    • 1. System Calls (For Programmers)
    • 2. System Programs (For Users)
    • 3. Commands (For Superusers)
    • 4. File System (For All)
  • 5. Modern Operating Systems Windows (Microsoft Corporation) these include a family of systems: 98, Me, CE, 2000 , XP, Vista , and others Linux ( (Linus Torvalds, OSF GNU) OSF-1 (DEC, OSF) Solaris (Sun Microsystems) ( IRIX (Silicon Graphics) OS2 (IBM) OS/390 (IBM) VMS (Dec/Compaq/HP) MacOS (Apple)
  • 6. The History of WINDOWS
    • Timeline of Microsoft Windows
    • 1983 Microsoft Windows was first announced in November, 1983.
    • Timeline of Microsoft Windows
    • 1983 Microsoft Windows was first announced in November, 1983.
    • 1985 Microsoft Windows version 1.0 was released in November, 1985.
    • 1987 Microsoft Windows version 2.0 was released in April, 1987.
    • 1990 Microsoft Windows version 3.0 was released in May, 1990.
    • 1992 Microsoft Windows version 3.1 was released in April, 1992.
    • 1995 Microsoft Windows 95 was released in August, 1995.
    • 1998 Microsoft Windows 98 was released in June, 1998.
    • 1999 Microsoft Windows 98 SE (Second Edition) was released in May, 1999.
    • 2000 Microsoft Windows ME (Millennium) was released in July, 2000.
    • 2001 Microsoft Windows XP was announced on February 5, 2001.
  • 7. Windows
    • Windows 95, 98, 2000, ME, NT, XP?
    • Desktop and icons
    • Task bar
    • Start button
    • Programs
  • 8. Windows XP™
    • Biggest,
    • …most comprehensive,
    • …most widely distributed
    • …general purpose operating system in history of computing
    • Affects almost all other systems, one way or another
  • 9. Windows XP
    • 32-bit preemptive multitasking operating system for Intel microprocessors
    • Key goals for the system:
      • portability
      • security
      • POSIX compliance
      • multiprocessor support
      • extensibility
      • international support
      • compatibility with MS-DOS and MS-Windows applications.
    • Uses a micro-kernel architecture
    • Available in at least four versions: Professional , Server , Advanced Server , National Server
  • 10. Design Principles (Cont.)
    • Reliability
        • XP uses hardware protection for virtual memory, software protection mechanisms for OS resources
    • Compatibility
        • Applications that follow the IEEE 1003.1 (POSIX) standard can be complied to run on XP without changing the source code
  • 11. Design Principles (Cont.)
    • Performance
        • XP subsystems can communicate with one another via high-performance message passing
        • Preemption of low priority threads enables the system to respond quickly to external events
        • Designed for symmetrical multiprocessing
    • International support
        • Supports different locales via the national language support (NLS) API
  • 12. So.. What’s the big deal?
    • Windows 7 can be seen as a incremental update to Windows Vista. It has a simpler user interface and enhancements to performance, but uses the same technologies already in place with Vista.
    • Windows 7 is made to be compatible with Vista programs, and works with most Vista drivers.
  • 13. New Feature: Jump Lists
    • One of the most useful improvements in Windows 7 is the addition of Jump Lists: contextual menus that pop-up when hovering over an icon in the Start menu. Jump Lists also appear when right-clicking on an icon in the taskbar.
  • 14. Jump Lists
    • The main role of Jump Lists is to provide access to recent documents in as few button clicks as possible. For example, opening a recently visited site (or favorite) in Internet Explorer 8 is as simple as right-clicking the IE icon on the taskbar and then left-clicking the site.
    • In Microsoft Office, Jump Lists can be used to quickly open recent documents.
  • 15. Jump Lists Contd…
    • Any program—or file within a Jump List—can also be “pinned” to the taskbar, similar to Quick Launch icons in Windows XP.
  • 16. New Feature: Program Thumbnails
    • If a program is open, then hovering over that program’s icon in the taskbar will bring up a thumbnail view of any open windows.
  • 17. New Feature: HomeGroups
    • Windows 7 takes a new approach to home networking with the advent of HomeGroups. Sharing files with other Windows 7 PC’s is easy, and is secured with 128bit encryption and a randomly generated password.
  • 18. New Feature: Action Center
    • The Security Center in Windows Vista and Windows XP is gone, replaced with Windows 7’s brand new Action Center.
    • The Action Center not only provides security information, but also problem reports and recovery options—all within a single dialog.
  • 19. New Feature: Problem Steps Recorder
    • The Problem Steps Recorder, accessible by typing psr.exe into the Search bar, documents the actions needed to reproduce an error. Once complete, the report can then be given to a system administrator—or used for self analysis—to easily troubleshoot your PC.
  • 20. New Feature: XP Mode
    • Windows 7 Ultimate has a freely downloadable add-on that lets users run an instance of Windows XP within a window on their Windows 7 desktop. To use this feature, the PC’s processor must support virtualization.
  • 21. Missing Features
    • Windows 7 no longer comes with:
      • Windows Movie Maker
      • Windows Messenger
      • Windows Mail
    • But new versions of these programs can be downloaded now as part of the Windows Live Essentials pack.
      • Download the pack at
  • 22. Editions and Availability
    • Windows 7 was released on October 20 th , 2009. Although 6 different versions are developed, only 2 is initially available at retail:
      • Windows 7 Home Premium
      • Windows 7 Professional
    • Windows 7 Ultimate will be accessible via the Windows Anytime Upgrade program.