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Transcript

  • 1. Computer Software Mr Arthur
  • 2. Aims of Lesson 1
    • Go over Network test
    • What is an Operating System?
    • Application Software
  • 3. Operating System
    • The OS is the program that provides the HCI, manages input and output and controls all Main Memory and Backing Storage devices
    • The Bootstrap is a program that loads the OS from Backing Storage
    • Examples
      • Windows XP/Vista/7/MACOS/Linux
    • Key functions
      • Providing the HCI
      • Displaying data on screen
      • Creates Hierarchical filing system
      • Saving files to backing storage
      • Provides security
      • Controls input/output devices
  • 4. Application Software (Apps)
    • Application software does not control parts of the computer but is written to the help the user perform a particular task
    • Examples
      • Microsoft Word
      • Microsoft Excel
      • Itunes
      • Powerpoint
  • 5. Lesson Starter
    • What is an Operating System?
    • Give 3 functions on an Operating System
    • What is Application software?
  • 6. Aims of Lesson 2
    • Last Lesson
    • What is an Operating System?
    • Application Software
    • Today’s Lesson
    • Standard File Formats
    • Objects and Operations
  • 7. Standard File Formats
    • A Standard File Format is a file format that can be opened up on many different applications
    • Text
      • ASCII, txt, Rich Text Format
    • Graphics
      • JPEG, Bitmap, Gif
  • 8. Objects and Operations Application Object Operation Word Processing Letter/Word Format Size/Style/Cut/Paste/Align Graphics Image Crop/Rotate/Rescale Spreadsheet Text/Number Format Size/Cut/Paste/Align Database Field/Record Change Field Type/Sort/Search
  • 9. Aims of Lesson 3
    • Last Lesson
    • What is an Operating System?
    • Application Software
    • Standard File Formats
    • Objects and Operations
    • Today’s Lesson
    • Computer Virus
    • Symptoms of a Virus
    • How they Spread
    • Antivirus
  • 10. Computer Virus
    • A virus is a destructive piece of software that attaches itself to other files, reproduces, spreads and corrupts files or data
    • Virus Symptoms
      • Strange noises or visual effects
      • Unexpected reboot of computer
      • Unwanted creation of emails
      • Displaying unwanted messages
    • How they Spread
      • Spread through infected memory sticks, cds
      • Visiting infected websites and downloading code
      • Downloading infected email attachments
  • 11. Antivirus Software
    • Anti-virus software often works by having a database of virus signatures (parts of code that are viruses)
    • The software then scan documents, files etc comparing them to the virus signatures
    • The software then flags up the virus it has found
    • Antivirus software needs to be constantly updated to add new virus signatures to the database
  • 12. Arrangements
    • Distinction between an operating system and an application program with examples of each
    • Explanation of the need for standard file formats
    • Description of the following standard file formats for text files: text, ASCII, rich text file
    • Identification of data objects and operations in the context of word processing, databases, spreadsheets and graphic packages
    • Definition of a virus
    • Description of how a virus operates
    • Description of the following common symptoms of virus infection: displaying unwanted messages, unusual visual/sound effects, computers rebooting unexpectedly, unwanted generation of e-mails
    • Description of how viruses are spread via floppy disk, homemade CDs, ‘fun’ websites and e-mail attachments
    • Explanation of the need for anti-virus software