Transcript Lesson 1 - Shawlands Academy

Computer
Systems
Nat 4/5 Computing Science
Operating Systems
Lesson Aims
 By
the end of this lesson:
 All pupils will be able to:



Describe what an operating system is
Describe what an application program is
Describe the functions of an operating system
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Types of software
 There
1.
Applications

2.
are two main types of software:
These are pieces of software that perform a
particular task such as word processing or
desktop publishing
Systems Software (Operating Systems)

These types of software control the running of
hardware and the running of other software
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Applications Software
 Application
software are programs that are
designed to do a particular task.
 For example the Word Processor your
revision notes were written in is an
application program.
Even games are
application programs.
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Operating Systems
 An
operating system is a piece of software
that controls the operation of the systems
hardware and the running of other
software.

Two of the more popular operating systems
used at present are
 Microsoft®
Windows
 Apple® OSX.
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Why is it important?
 You


Which operating system do you write it for?
IOS® Android ® Windows ® ?
 Why
 If
are writing an app for a smartphone
do you need to bear this in mind?
I buy Office 2010 for windows – can I install
it on a Mac?
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Operating Systems: Functions

All operating systems have certain common functions:
Provision of an Interface
• This is the means of interacting with the user. Most modern
operating systems provide a GUI (Graphical User Interface)
Input Output
• Controls the sending and receiving of data to and from
peripherals
Memory Management
•Controls the systems RAM, controlling which locations in RAM
programs are loaded into
File Management
• Controls where and how files are saved onto backing
storage.
Error Reporting
• Providing useful feedback to users when errors do occur.
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Summary


The Operating System (OS) of a computer is a
program which manages the hardware and
the running of other software on a computer
system.
The standard functions of an OS are:






Provision of an interface
Input/Output
File Management
Memory management
Error Reporting
An application program is a piece of software
that performs a particular task such as games,
word processers.