User interfaces - Basic operations of a computer.

User interfaces - Basic operations of a computer.

1. BASIC OPERATIONS OF A COMPUTER (USER INTERFACES) 9626 AS LEVEL - IT

2. SPECIFIC OUTCOMES AT THE END OF THIS LESSON, PS: Define User interface Identify types of User interface Differentiate the types of user interface.

3. WHAT IS A USER INTERFACE? A user interface is a combination of hardware and software that helps people and computers to communicate with each other. A user Interface controls how data and instructions are entered into the computer, including the display device, mouse and keyboard that enable you to view and interact with the computer software. This Photo by Unknown Author is licensed under CC BY-NC-ND

4. TYPES OF USER INTERFACE The TWO main user interfaces are: Graphical User interface (GUI) Command Line interface (CLI )

5. GRAPHICAL USER INTERFACE GUIs GUI (pronounced ‘goo- ey ’) allow the user to interact with a computer (or MP3 player, gaming device, mobile phone, etc.) using pictures or symbols ( icons ) rather than having to type in a number of commands.

6. KEY FEATURES OF GUI Windows : windows display a computer program that divides the screen into small portions. Icons : Icons denote small pictures that represent computer programs, files and commands. Menu : allows the user to select various programs to run. Pointer : This refers to a symbol on a display screen that a user moves to select commands, programs and objects. This Photo by Uknown Author is licensed under CC BY

7. KEY FEATURES OF GUI

8. ADVANTAGES Easier for non- technical people. Drag and Drop features Looks nicer than text interface User friendly Suitable for disabled People

9. DISADVANTAGES Difficult to develop and high cost Slower than command line interface Consume a lot of memory

10. COMMAND LINE INTERFACE In a command line interface (CLI), the user has to know the commands, and needs to type them in or press special keys to execute commands and tasks. The set of commands entered into the computer is called command language. This Photo by Unknown Author is licensed under CC BY-SA-NC

11. COMMAND LINE INTERFACE

12. EXAMPLES OF CLI MS-DOS ( MICROSOFT DISK OPERATING SYSTEM ) CP/M (Control program for microcomputers Apple DOS (Apple Disk Operating System)

13. ADVANTAGES Need less memory to operate Does not use much C.P.U processing time A low resolution, cheaper monitor can be used

14. DISADVANTAGES It is confusing to non- technical people Large number of codes need to be learnt