Write today’s date and title in the front of your book. Underline it. Operating Systems Write today’s date and title in the front of your book. Underline it.

Starter http://www.youtube.com/watch?v=tGvHNNOLnCk Or watch from the shared area Questions… How much was Windows 1? More to the point – what is Windows?

Lesson Objectives By the end of this lesson you will: Be able to define what an operating system is Be able to identify an Operating System Identify features of command line and GUI Operating Systems

Operating Systems Basically it’s the middle man. The Operating System or OS sits between your hardware and software. An OS is SOFTWARE too! It controls, organises and manages the interactions between all hardware and software If something is plugged in to your computer – the OS is controlling it.

What does an OS consist of… OS’s come in several parts: Part of the software is responsible for interacting with the hardware – this is called the Kernel. The important part you see is the Interface – this is responsible for displaying information to the user and getting commands and input from the user.

Questions… What does OS stand for? Is the OS hardware or software? What is an interface? What does an OS do?

Operating System = OS OS = Software Summary Operating System = OS OS = Software It controls, organises and manages the interactions between all hardware and software  

What does it do… The general tasks for a typical operating system include: Controlling the operation of the input, output and backing storage devices Managing resources Supervising the loading, running and storage of application programs Dealing with errors that occur in applications programs Allowing communication between user and the computer system (user interface)  

Research… Find out what a GUI is. Find 3 examples of GUI operating systems. Look at your computer – write down 3 features of windows that you think makes it easy to use, explain why...

GUI – Graphical User Interface Uses Windows, Icons, Menus, Pointers to organise information and allow user interactions. Intuitive – The user can work out how to do a lot of things without any help or training Makes multitasking easy – can organise and arrange many windows Icons give clear representations of programs, files and folders Pointers are a natural way of selecting things – point to what you want Takes up a lot of space in memory and storage Can be resource hungry – needs a reasonably powerful computer Can become confusing if the screen is cluttered with many icons or open programs

Command Line Interface… What do you think these do? dir md cd c:\ rd Watch the teacher demonstration of a Command Line… (laptop or using the shortcut in the folder/VLE)

Command Line Interface… What do you think are the advantages and disadvantages of this system? Where do you think this kind of OS would be used?

Command Line Interface Allows the user to interact with the device by typing written instructions/ commands Takes up very little memory and storage – good for embedded systems Can write lists of commands called “scripts” to automate repetitive tasks Can be much faster to use once familiar with shortcuts and commands Can be confusing for new users. Difficult if you have dyslexia / sight problems You must know the commands or you can’t do anything! Not intuitive

Plenary… What is an operating system? What does GUI stand for? What does WIMP stand for? List 2 features of a command line interface? Who is likely to use a command line interface?

Extras… The History of Windows… http://www.youtube.com/watch?v=TWfcZmynwFU Have a go on Windows 3.1… www.michaelv.org