Computer software includes application software and system software. Application software helps users perform tasks like word processing, while system software like operating systems control hardware resources and enable applications to run. There are two types of application software - general purpose software designed for widespread use, and special purpose software customized for specific needs. System software includes operating systems, language translators, editors, utilities, and drivers that allow software and hardware to communicate.
Introduction to Computer Software, Classification of Computer Software, Computer BIOS, Operating System, Utility Software, Compiler and Interpreter, Linker and Loader, Application Software, Programming Languages
Operating systems are there from the very first computer generation and they keep evolving with time. In this chapter, we will discuss some of the important types of operating systems which are most commonly used.
system software is a set of programs that enables a computer to perform routine tasks. types of system software are operating system & utility programs.
Introduction to Computer Software, Classification of Computer Software, Computer BIOS, Operating System, Utility Software, Compiler and Interpreter, Linker and Loader, Application Software, Programming Languages
Operating systems are there from the very first computer generation and they keep evolving with time. In this chapter, we will discuss some of the important types of operating systems which are most commonly used.
system software is a set of programs that enables a computer to perform routine tasks. types of system software are operating system & utility programs.
Application software: helps users solve particular problems
In most cases, application software resides on the computer’s hard disk
Application software can also be stored on CDs, DVDs, and flash or key chain storage devices
system software and application softwareTallat Satti
Software is a general term for the various kinds of programs used to operate computers and related devices. (The term hardware describes the physical aspects of computers and related devices.)
Perform more specialized tasks (word processing, spreadsheets, email, photo editing, bookkeeping)
Installed onto your computer with disk or downloaded
Can be web based, with no need to download program onto computer
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Venez le découvrir lors de cette session ignite
2. • Computer software is a set of instructions that tell
hardware what to do.
• They are also called programs.
• It is needed to control activities of hardware. It is in-
tangible; we cannot touch or see it.
• There are two types of software.
Application Software
System Software
Software
3. Application Software
• It is software that has been developed to solve a
particular problem (s) of user
• to perform useful work on specific tasks or to provide
entertainment.
• It is for the benefit of user.
• It helps user to work faster, more efficiently and gives
more productivity than manual work.
• There are two categories of application software
General purpose or generalized and
Special purpose or specialized or Bespoke
4. General-purpose application
software
• It is designed and developed for sale to the general public
and performs general tasks. Examples are word processors,
spreadsheet programs, computer games, etc.
• It is mostly used by small business and home users of
microcomputer.
• But they can do only predefined works.
• They are not build on users order but are made for general
needs of users.
5. Special purpose application
software
• It is designed and developed for the needs and
requirements of particular customer.
• They are made on order for particular user and may not be
useful for other company or user.
• Charges of software development, modifications and
addition in it vary depending on its difficulty and size.
6. Example of Application Software
• Word Processors
• Spreadsheets
• Database Management software
• Graphics, Multimedia and Presentation applications
• Entertainment, Games and Education software
• Utilities
• Communication software
7.
8. System Software
System software are consists of programs that controls
the overall operations of system.
• System software controls the usage and allocation of
hardware resources and enables the application
software to run.
• It is responsible for running computer system
smoothly.
• System software consists of several programs; the most
important is operating system.
• Other examples of system software are language
translators, utilities, anti-viruses etc.
9. Types of system software
• There are many types of system software. Most common are as
follows.
• Operating System
• Language Translators (also related to language, Debuggers, Testing
programs, Program generators, linkers)
• Editors
• System Utilities
• Destructive programs (Viruses), Anti viruses, Guards or Shields
• Drivers
10. Operating System
• Operating system is a master control program that
provides an interface for a user to communicating with
computer.
• Manages hardware devices, manages and maintains disk
file system and supports other application and system
programs.
• It is used to manage computer resources efficiently.
• It controls the inputs, outputs, interrupts, and storage
of files as requested by the applications software.
• E.g DOS, Unix, Linux, Windows, Sun Solaris etc.
11. Operating Systems
• Microsoft Windows is the most popular
– Installed more than other OS combined
– Installed on about 95% of computers
– Apple and Linux represent the other 5%
12. PC Operating Systems
• DOS
– Disk Operating System
– Single user single-tasking OS
– Command line interface
– 16-bit OS
– Powerful
– Fast
– Supports legacy applications
14. PC Operating Systems
• Windows NT
– Designed for a powerful system
– 32-bit OS
– Very stable
– Windows NT Workstation
• Single user multi tasking OS
– Windows NT Server
• Multi user multi tasking OS
• Network operating system
15. PC Operating Systems
• Windows XP
– Microsoft’s newest desktop product
– Different look from 2000
– Many different versions
– Digital multimedia support was enhanced
– Communications was enhanced
– Mobile computing became a priority
16. PC Operating Systems
• UNIX
– Runs on all computer types
– 32- or 64-bit
– Very stable and fast
– Command-line interface
– Can cost thousands of dollars
17. PC Operating Systems
• Linux
– Free or inexpensive version of UNIX
– 32-bit OS
– Very stable and fast
– Most flavors are open source
– X Windows GUI
• Command line interface is available
21. Embedded Operating
Systems
• Pocket PC
– Developed to compete with Palm
– Not customizable
– Interacts securely with business networks
– Can control PCs through PC
25. Providing a User Interface
• Command line interfaces
– Older interface
• DOS, Linux, UNIX
– User types commands at a prompt
– User must remember all commands
– Included in all GUIs
27. Types of Operating Systems
• Real-time operating system
– Very fast small OS
– Built into a device
– Respond quickly to user input
– MP3 players, Medical devices
28. Types of Operating Systems
• Single user/Single tasking OS
– One user works on the system
– Performs one task at a time
– MS-DOS and Palm OS
– Take up little space on disk
– Run on inexpensive computers
29. Types of Operating Systems
• Single user/Multitasking OS
– User performs many tasks at once
– Most common form of OS
– Windows XP and OS X
– Require expensive computers
– Tend to be complex
30. Types of Operating Systems
• Multi user/Multitasking OS
– Many users connect to one computer
– Each user has a unique session
– UNIX, Linux, and VMS
– Maintenance can be easy
– Requires a powerful computer
32. Language Translators
• Translators are the programs that convert programs
written in computer languages (Assembly, high level
and other) to machine language so they can be
executed by computers.
• There three types of computer translator programs.
• (a) Assemblers (b) Compiler (c) Interpreter
33. Language Translators
• Assembler: It is language translator program used to
translate assembly language code into machine language.
e.g. Masm, Tasm
• Compiler: Translates whole program called source
program into machine language all at one time before
program is executed. Once converted it is in machine-
readable form (called object code) it never needs compiler
again or source code. E.g. C language compiler, Cobol
compiler.
34. Language Translators
• Interpreter: An interpreter translates a program into machine
language one instruction at a time.
• Each instruction or groups of instructions are executed after
translation.
• It does not store code in machine-readable form; therefore each
time we run program source code and interpreter is needed.
Example is GW-Basic
• Debuggers and testing programs: are used to find logical
errors in program.
• Program generators : are programs that automatically
generate other programs.
• Linkers: create link between parts of any object program for a
particular compute in specified memory.
35. Editors
• Editors are software used to write data in simple text
format.
• They do not enter any formatting codes.
• They are used to write and alter language programs,
making instruction files for operating system like batch
files, and system configuration files.
• Many languages have their own editors but some allow any
editor for program writing. Examples are edit in DOS, and
notepad in windows operating system.
36. System Utilities
• System utility programs come with operating system
package but some are separately available.
• They are used to check system resources like processor
resources, memory space, and hardware check and to
correct or retrieve corrupt data from disk.
• They are also used to make software use more efficiently. It
includes disk diagnostic tools. Examples are scandisk,
chkdsk, dxdiag, regedit, etc.
37. Destructive programs (Viruses)
• Destructive programs are used to disturb the user.
• It can hang computer, corrupt or alter data and even disable any
of your hardware.
• These programs come silently in your computer automatically
and start their work.
• They come from some input device, storage device or network.
• They are generally called computer viruses.
• Some of them cause damage immediately and may destroy
specific files.
• But some wait for a particular condition to match either a
particular date or time or any state of computer.
• There are different types of these programs like bacteria, Trojan
horses, etc.
38. Anti viruses, Guards or Shields
• To help users against virus programs a system program is made known as
Anti virus program, which gets rid from these programs and also try to
recover the damage made by them.
• A program known as “Guard” or “Shield” usually packaged with anti
viruses stops entering these destructive programs in computer and
damaging it.
• Example of anti viruses and shields are is Norton, McAfee, PC-Cillin, etc.
39. Drivers (Device drivers)
• It is a program, which is used for communication between
operating system and any (hardware) device such as video
controller, printer.
• It can be part of operating system as mouse drivers in
windows or can be installed separately as laser printer
drivers.
• All new hardware devices come with driver programs that
enable operating system to use that hardware.
• Examples are Sound, VGA, modem and mouse drivers.
Editor's Notes
Teaching tip
Students often fail to see the value in older OS or applications. As an example, a metal fabrication plant in Pittsburgh PA is still using a program written in the early 70’s that calculates metal temperatures.
Teaching tip
At press time, the 64 bit version of XP was still in the late beta stage. More information can be found at www.microsoft.com/presspass/press/2003/sep03/09-23athlon64betapr.asp.
Teaching tip
OS X versions change often. Keep track of the most current and present this to the class. Visit www.apple.com/macosx/ to keep up to date. At press time the latest version was 10.4 Tiger.
Teaching tip
Demonstrate the command line interface in Windows by running cmd. In the command line interface use ping and ipconfig as commands that cannot be run in the GUI.