2. 2.1 Idea of Stored Data  Data is a collection of raw facts which may be represented by numbers, text, graphics, etc.  They become meaningful after being processed.  The processed data is called information. GraphicsTextNumber Stephen Hawking299 792 458 Three main types of data: number, text and graphics

3. 2.1 Idea of Stored Data  We have to deal with a lot of data everyday, for example, date of birth, weight, height and telephone numbers.  To use data repeatedly, we need to store it. By memory By handwriting By computer storage Three ways of storing data

4. 2.1 Idea of Stored Data  A shopping checklist can be stored, e.g.: ◦ on paper ◦ in a PDA  The checklists are examples of stored data.  Data can be managed and reused more efficiently if it is organized and stored appropriately. Kevin write down his shopping checklist on a paper. Susan uses a PDA to write down the shopping checklist. Examples of stored data in our daily lives

5. 2.2 Idea of Stored Program  A program consists of a series of commands, which can instruct the computers to perform a specific tasks.  Computer operate according to the order of the commands.  It is important to write the commands in a correct order. Otherwise, the computers cannot perform the specific task successfully.

6. 2.2 Idea of Stored Program  Stored programs are used to perform certain specific or repeated tasks, e.g. ◦ preset programs stored in video recorders and washing machines  With stored programs, computers can perform tasks automatically and repeatedly.  Computers can relieve us of tedious tasks such as calculation and machine control. Use a remote control to set the recording schedule

7. Can you instruct a robot to pass through the following maze? Activity 3 Passing through the maze Exit Entrance Rule: You may use a pencil to draft your route first and then analyze a series of commands for the robot.

8. Activity 3 Passing through the maze Command011011 TaskTurn leftTurn rightStep forward The above table shows the commands which control the robot’s actions. Write down the program which will direct the route of the robot.

9. Activity 3 Passing through the maze 111011 0111 0111 1011 1011 01

10. 2.3 Storage Device  another type of computer hardware  used for storing data and programs Input device Central processing unit Output device Hard disk Floppy disk CD-ROM USB flash disk SD card CompactFlash card Memory Stick Storage devices The relationship among input devices, central processing unit, output devices and storage devices

11. Different storage devices work with different equipment. Try to match them correctly. Activity 4 Understanding storage device Floppy disk DVD Octopus card SIM card SD card Smart Identity Card Digital camera Floppy disk drive Smart card reader Octopus reader Mobile phone DVD player