Saturday, 1 October 2011

Difference between software and program
•Program is a set of instructions and Software is a set of interlinked programs. 
Software can be broadly classified into:
•System software  

Provides basic functions of the computer
 Windows XP
Windows 95 Windows 98 ,Windows NT ,Windows 2000, Linux are some exumple of   system software ,
Application software  
Is employed by users, such as teachers and students, to accomplish specific tasks 
For example, Paint is an application software
Introduction to Operating Systems
Operating System (OS)
is a software, manages and controls the working of a computer,  checks that all of the computer’s internal devices, such as RAM, ROM and peripheral devices, such as printer and monitor, are functioning properly . Loads after these checks are successful
Examples of Operating Systems are:
–Unix
–Mac
–Windows 

Different versions of the Windows Operating System are:
•Windows 95
•Windows 98
•Windows NT
•Windows 2000
•Windows XP

•Windows Vista
•Windows 7
User Interface  
User interfaces provided by the Operating System  is the means of communication between a computer and a person or other device 
User Interface is of two types:
Text-based are less intuitive. 

Depend on text commands made up of various words and symbols, which the user has to memorise 
Example MS-DOS
•Graphical  

Uses visual components rather than text 
Provides menus and toolbars that contain commands to perform specific tasks   
ForExample Windows-XP 
Functions of an Operating System are:  

1. Receives inputs, Translates and processes 
2. The processed results are converted into a form that the user can understand 
3. Acts as an intermediary between the user and the computer hardware 
4. Handles data transfer 
5. Manages storage space 
6. Ensures that the system resources are utilised by authorised users only 
•Application software

–Software employed by users to accomplish specific tasks
•Interface means of communication between a computer and a person or other device
•Program is a set of instructions
•Software
is a set of interlinked programs, which directs a computer to perform specific tasks
•System software  

Software that provides basic functions of the computer
System software is a software manages and controls the working of a computer checks that all of the computer’s internal devices, such as RAM, ROM and peripheral devices, such as printer and monitor, are functioning properly

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