2. Input/output (I/O) Input is how data is received into a computer system which results in outputthat is displayed to the user. Multi-purpose devices: UPS device for signatures
3. Input Devices The input device captures data and enters it into the computer system. Source Data Automation General-Purpose and Special-Purpose
4. General-Purpose Input Device General-purpose input devices can be used in multiple computing activities. Keyboard QWERTY Pointing Devices select items displayed on a screen.
5. General-Purpose Input Devices Cont’d Users can use finger or stylus to directly select objects on a screen with the use of Touch Screens. Users can use multiple fingers to select objects with Multitouch Displays.
6. Special-Purpose Input Devices Special-purpose input devices are used in specific computing activities. Game controllers and joysticks, webcams, hand held scanners…
7. Special-Purpose Input Devices Cont’d Magnetic ink character recognition (MICR) Optical character recognition (OCR) Point-of-sale (POS) devices Optical mark recognition (OMR) Scantron reader
8. Output Devices Output devices allow users to view the results of the input. Historically visual and audio Virtual reality systems, new wave of output Displays, Printers, Speakers
9. Video Card Video card/graphic cards translates binary data from the CPU and turns it into a picture that video users can see. Graphics Processing Unit (GPU)
10. Video Card Cont’d Desktop systems Graphics Processing Unit (GPU) Notebook systems Integrated Graphics Processor
11. Display A display allows users to view the output on a screen. Display screens = monitors Display Options: High definition (HDTV)- 2xs the resolution 3D displays- home systems LCD projectors
12. Display Technologies Cathode ray tube (CRT) display Reads electron beams across a fluorescent screen. Liquid crystal display (LCD) Uses liquid crystals to display images on a backlit screen Plasma Display Uses plasma gas to create light
13. Display Technologies Cont’d Light emitting diode (LED) display Uses LEDs to provide backlight Green Technology Electronic Paper (e-paper) Uses electric charges to display the image Kindle
14. Printer Printers create “hard copy” output Pages printed per minute (PPM) Types of Printers: Laser printer Ink Jet printer Photo printers Multifunction printers Plotters 3D printer
15. Audio and Special Media Output Audio and Special Media Output devices provide output other than sight. Sounds systems: CD/MP3 music players DVD/Blu-ray disk players Multimedia and gaming enthusiasts Surround sound with subwoofers
16. Audio and Special Media Output Cont’d Screen-reader programs for vision impaired JAWS Haptic Output Vibrations The Scent Dome from TriSenx Olfactory-directed output Edible Output
17. Expansion Expansions enable computers to interact with various external devices. External devices = peripherals Ports connect to peripherals Universal Serial Bus (USB) USB 3.0 is the fastest
18. Expansion Cont’d Expansion Cardis used for specialty peripheral devices Expansion Slots are located in motherboard Wireless technologies Bluetooth
19. Innovative I/O Technologies There are endless possibilities for new I/O technologies USB Mini Fridge Mini USB Monitor USB Lamp Any Questions?
Source Data Automation- automates input data near the source in order to avoid entry errors
Keyboards- most popular general purpose input deviceQWERTY- input data device
Special Purpose input devices are becoming more frequently used than in the past because of the ever changing world applications and software.
-magnetic ink character recognition (MICR)- reads special magnetic ink characters such as those written on the bottom of checks-optical character recognition (OCR)- reads hand printed characters-point of scale device (POS)- retail scanner that reads the code from tag and enters it into the computer system-Optical mark recognition (OMR)- reads “bubbled in” forms
Output- good output is easy to interpret Displays, printers, speakers=most common types of outputVirtual reality systems- tactile and olfactory output
-They combine powerful graphics that generate realistic images.-GPU- some graphics cards include GPU to process graphics (way to process graphics that takes the load off of video memory, RAMDAC, CPU…..
-Desktop systems- graphics card/video card is plugged into the motherboard-notebooks- graphics card/video card is typically integrated into the motherboard.
-HDTVs = 2x the resolution of traditional TV displays, sharper crisper images.-3D displays= uses polarization technologies to add depth and realism., companies such as Samsung are now creating 3D tv home systems-LCD projectors- images from computer to big screen
-CRT- big and bulky,being replaced by smaller, less bulky screens-LCDs are thin and flat, popular as both computers and televisions
-LEDs are gaining popularity as green technologies because they use less energy and do not require the use of mercury. -E-paper makes it easy to see the screen outdoors and is easier on the viewers eyes.
-Audio output has become very popular with the growth of mobile media such as smart phones and Ipods- Multimedia and gaming enthusiasts usually purchase higher quality sound systems
-Screen–readers read allowed text displayed on screens-Haptic Output is output that the user can feel-Scent Dome is a USB device that delivers scent output by way of delivering fragrances as commanded by the computer.-Edible output: printers have been created to print flavored pieces of paper for tasting samples sent over the internet.
-Peripherals increase computer capabilities-special-purpose cables and connectors are not supported by all computers-USB invented to standardize interfaces. All use common connector design
-Wireless technologies further expand the capabilities of a computer-Example is Bluetooth
-USB Mini Fridge uses power from computer via USB cord. Can fit a can of Coke-Mini USB Monitor- Tiny touch screen monitor for extra desk space. -
