1. MAC OS – Unit A Page: 6-7, 8-9 Examining Input Devices Examining Output Devices

2. Examining Input Devices  Before a computer a computer produce useful information, a user must get data into it.  This is done using Input Devices.

3. Types of Input Devices - Keyboard  One of the most frequently used input devices is the keyboard.  There are two kinds of keyboards:  Standard  Ergonomic: Ergonomic means that it has been designed to fit the natural placement of the hands

4. Ergonomic Keyboard Standard Keyboard

5. Types of Input Devices- Mouse  The pointing device that is known as the mouse controls the pointer. That is a small arrow on the screen.  Pointing devices are used to select and move graphical icons on the screen. A mouse has two buttons for clicking commands.  A mouse has a track wheel used for scrolling through the page.  Sometimes you have a track wheel that is used to move the arrow of the device without moving the mouse.  Notebook computers have a track pad. That is a touch-sensitive device that you drag your finger over to control the pointer.

6. Track ball Track pad

7. Types of Input Devices - Scanner  A scanner is an device that transfers the content on a piece of paper into memory.  Microphones are another types of input devices.  Input devices can be connected to the computer either with cables or wirelessly.

8. Microphone Scanner

9. Quick Quiz WWhich of the following is a pointing device that allows you to control the pointer by moving the entire device around the desk ? MMouse TTrackball TTrack pad PPointing stick AAnswer : Mouse

10. Types of Output Devices  Output is the result of processing input.  Output devices show you these results.  Types of output devices: monitor, printer, speakers, etc..

11. Monitor 1. Monitor displays output from the computer. 2. Figure A-9, Page 9 shows two types of monitors: 1. Flat Panel Monitor: a light weight monitor that takes very little space on the desktop. Their images are created used LCD (Liquid Crystal Display) 2. CRT (Cathode Ray Tube): require more space to be placed on the desk 3. Apple’s Mac: combines the LCD monitor with other components into one unit.

12. CRT Flat Panel Apple’s Mac

13. Quick Quiz 7. What are the three types of monitors? 7. Flat panel monitor 8. CRT monitor 9. Apple’s Mac

14. Monitor Display  Monitor screen size is the diagonal measurement from one corner of the screen to the other.  Desktop computer range from 15” to 30”  Notebook computers range from 12” to 20” Monitors have graphic display which divides the screen into a matrix of dots called pixels. Resolution is the number of pixels the computer displays.

15. Monitor Display – Cont.  Dot pitch (Dp) measures the distance between pixels. A smaller dot pitch means a sharper image  To display graphics, a computer must have a graphics card, also called video display adapter or video card.

16. Printers  A printer produces a paper copy, often called hard copy of the text or graphics processed by the computer.  There are three categories of printers:  Laser Printers: They produce high quality output quickly. A temporary laser image is transferred into paper with a powdery substance called toner.  Inkjet Printers: are usually used at home. They spray ink into the paper and produce good quality output  Dot Matrix Printers: transfer ink into the paper using striking a ribbon with pins. They are used for large papers.

17. Laser Printer Dot matrix Printer Inkjet Printer

18. Speakers  Speakers, are like speakers on sound system, allow you to hear sounds from the computer.  Speakers can be built in or external peripheral devices that would be attached to the computers.

19. Quick Quiz  In order to display graphics, a computer monitor needs :  Parallel port  Network card  Graphics card  Sound card  Answer: Graphics Card