Unit 2B: Input Hardware Flashcards
3 types of INPUT hardware
1) Keyboard
2) Point Devices
3) Source Data Entry Devices
Dumb and Intelligent Terminals
input/output devices with 0 processing
Intelligent: includes processing and memory
Mark Recognition Readers
Magnetic Ink Character Recognition (MICR) - used on bank checks
Optical Mark Recognition (OMR) - scantron test sheet
Optical Character Recognition (OCR) - scans text and converts it to computer
Frame-Grabber Video Card
1 frame at a time
Full-Motion Video Card
30 frames per second
Sensor
collects data from environment
Biometric Input Devices
uses person’s characteristics for identification (fingerprint, face, iris)
How do you get higher resolution?
Higher VRAM (and more pixels)
Screen Clarity
Dot Pitch (dp) - space between pixels
Colour depth
Refresh Rate
Difference between Impact and Non Impact Printers
impact touch the paper and are multilayered
Laser Printer
produced in drum and transfered to paper
creates images with dots
Own RAM, ROM and CPU
Dot-Matrix Printer
images with dots, impact
Inkjet Printer
sprays droplets of ink on paper
Photo Printer
colour dye
Thermal Printer
uses heat (e.g. cash register)
Thermal Wax-Transfer Printers
wax based ink
Plotters
high quality 3D graphics
Page Description Language
tells printer how to print page (font, etc.), post script is preferred
Radio-Frequency Identification
identifying tag bearing a microchip which contains a code
Name some Health issues related to tech
carpal tunnel syndrome
neck, back pain
eyestrain
electromagnetic fields can be harmful
How is Binary Code Stored
Hard Drive
RAM
CD-RAM
What happens when you turn on your computer?
What happens when you wake up in the morning?
computer sends electrical signals to each component
Flat-Panel Display
2 plates of glass separated by a substance that manipulates light
Liquid Crystal Display (LCD)
Optical properties of liquid crystal are altered to create images
Plasma Display
- layer of gas between 2 glass plates
- apply voltage to release ultraviolet light -> activate dots
Cathode-ray tube (CRT)
out of style
Multiple Screens
display split in 2 to view 2 things at once
1D Bar Code
regular vertical stripes (16 ASCII)
2D Bar Code
different sized rectangles (1-2 thousand)
3D Bar Code
“bumpy code”
What are the Benefits of Flash memory?
Does not have a solid state, so it will save and not break, nonvolatile
Dot Pitch
space between pixels
More pixels = more resolution (dots per inch (dpi))
Colour Depth
of bits in dot (pixel), higher = better
Refresh Rate
Times per second that bits are recharged
