1. Unit 3 Peripheral Devices Section D

2. Chapter 1, Slide 2Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 2 Expansion ports provide connectivity for peripheral devices and include: Mouse and keyboard ports (these look identical) Network port – like a phone connector but larger Modem port – phone line connector for dial-up access Speaker and microphone General purpose USB ports Monitor port

3. Chapter 1, Slide 3Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 3 USB ports are now the most frequently used Most full-size notebooks have 4 USB ports Desktops have 6 USB ports (2 front, 4 back) A few devices using USB connectivity include mouse, scanner, printer, and joystick Windows automatically detects USB devices Detects the device when plugged in Determines type of device and configures it for use This capability referred to as Plug and Play (PnP)

4. Chapter 1, Slide 4Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 4 Software that determines how a peripheral device communicates with a computer Generally don’t need to install a device driver Usually already included with the operating system But if installing a new model of a peripheral device on an older computer, it may not have the driver Or if installing a much less common device CD with driver may be included with device If not included, can usually download from Internet

5. Chapter 1, Slide 5Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 5 Monitors now mostly LCD flat panel displays (Liquid Crystal Display) Clearer image with better color than older CRTs Also much more compact and use less power Screen size is measured diagonally Dot pitch is a measure of image clarity A smaller number is better, pixels closer together Resolution indicates number of pixels displayed A larger resolution yields a smaller image

6. Chapter 1, Slide 6Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 6 Several resolutions may be used As resolution goes up, more pixels must fit in same space Thus pixels must be smaller If pixels are smaller, image size will be smaller as well So to increase text or image size, select a lower resolution 800 x 600 resolution 1024 x 768 resolution

7. Chapter 1, Slide 7Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 7 Print quality expressed in dots per inch (dpi) More dots mean better print quality More dpi does not mean smaller text as in monitors Common types of printers Ink jet – nearly always print in color Laser – print in black & white or color Thermal transfer – black & white only Dot matrix – black & white only Parallel port formerly used to connect printers Most printers now connect through a USB port

8. Chapter 1, Slide 8Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 8 Ink jet and laser printer speeds Expressed in pages per minute (ppm) for B&W text Color prints slower than B&W Graphics prints slower than text 12 pages per minute is a typical print speed Thermal printer speeds listed in linear millimeters per second Dot matrix printer speeds listed in characters per second

9. Chapter 1, Slide 9Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 9 Nozzles spray ink on to paper Most popular home printing option High quality results for both text and graphics Very inexpensive to purchase But costly to operate Typically require 4 ink cartridges per printer Cartridges are expensive and often used quickly A poor solution for high volume printing needs

10. Chapter 1, Slide 10Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 10 Works like a copier with a light sensitive drum Most popular business printing option Very high quality results for text and graphics More costly to buy but cheaper to operate Black & white requires a single toner cartridge Color more costly requiring 4 toner cartridges Cartridges expensive but last far longer than ink jet Most color lasers also require drum be replaced B&W a good choice for high volume printing

11. Chapter 1, Slide 11Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 11 Uses special paper known thermal paper The ink is coated on the surface of the paper Ink changes from white to black when heated Heavily used for receipts of all types Gas stations, restaurants, stores Very convenient, no toner or ink to replace Just replace the roll of paper when it runs out

12. Chapter 1, Slide 12Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 12 Once the dominant printing technology Slow, noisy, and low quality Supplanted by laser and ink jet printers Dot matrix printers are still used to print multi-part carbon forms These forms require an impact printer Laser and ink jet printers do not strike the page Very inexpensive to operate

13. Chapter 1, Slide 13Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 13 Several printers may be available to a computer May be directly connected via parallel or USB port Or mutiple printers may be available on a network Can set one printer as the default printer Right click on printer & select Set as Default Printer Default printer appears with a check mark

14. Chapter 1, Slide 14Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 14 A circuit board that provides additional functionality Plugs into slot on motherboard End of card exposed to back of system unit Expansion boards may provide: Enhanced graphics for a monitor A sound card for connecting speakers As well as with many other possible functions

15. Chapter 1, Slide 15Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 15 A group of long narrow sockets on motherboard Provide a place to insert expansion boards 3 common types PCI – general purpose slot ISA – older technology replaced by PCI AGP – a lone slot designed only for graphics boards A board is designed for a particular type of slot Most desktop computers have 4-8 expansion slots

16. Chapter 1, Slide 16Starting Out with Visual Basic 3 rd EditionIntroduction to ComputersUnit 3D – Peripheral DevicesSlide 16 Notebook computers are designed to accept small, space-saving PCMCIA expansion cards But provide same capability as desktop expansion cards Can be type I (thinnest), type II, or type III (thickest) Most notebooks have 1 type III slot that accepts: Any combination of 1 or 2 type I and type II cards Or a single type III card