Computer Systems Nat 4 5 Computing Science Operating Systems

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

Nat 4/5 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

Nat 4/5 Applications Software Application software 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.

Nat 4/5 Operating Systems operating system is a piece of software that controls the operation of the systems hardware and the running of other software. An Two of the more popular operating systems used at present are Microsoft® Windows Apple® OSX.

Nat 4/5 Why is it important? You are writing an app for a smartphone Which operating system do you write it for? IOS® Android ® Windows ® ? Why If do you need to bear this in mind? I buy Office 2010 for windows – can I install it on a Mac?

Nat 4/5 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.

Nat 4/5 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.