Download - Int 2 software slides 2010
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Computer Software
Mr Arthur
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Aims of Lesson 1
1. Go over Network test
2. What is an Operating System?
3. Application Software
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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
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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
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Lesson Starter
1. What is an Operating System?
2. Give 3 functions on an Operating System
3. What is Application software?
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Aims of Lesson 2
Last Lesson
1. What is an Operating System?
2. Application Software
Today’s Lesson
1. Standard File Formats
2. Objects and Operations
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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
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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
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Aims of Lesson 3
Last Lesson
1. What is an Operating System?
2. Application Software3. Standard File Formats
4. Objects and Operations
Today’s Lesson
1. Computer Virus
2. Symptoms of a Virus
3. How they Spread
4. Antivirus
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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
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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
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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