Computer Software

Mr Arthur

Aims of Lesson 1

1. Go over Network test

2. What is an Operating System?

3. Application Software

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

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

Lesson Starter

1. What is an Operating System?

2. Give 3 functions on an Operating System

3. What is Application software?

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

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

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

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

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

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

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