Lesson 2- The Computer Flashcards
A ____ system is made up of various elements.
COMPUTER
Elements of a Computer?
- Input Devices
- Output Devices
- Virtual Reality
- Physical Interaction
- Paper
- Memory
- Processing
Type of Computer(3)?
- Desktop
- Laptop
- PDA (Personal Digital Assistant)
Our first generation of computer uses ____ ?
BATCH PROCESSING
Types of Keyboard?(2)
- QWERTY
- DVORAK
Most common text input device.
KEYBOARD
Text can be input into the computer, using a pen and a digesting tablet.
HANDWRITING RECOGNITION
For entering numbers quickly: ex. Calculator , PC Keyboard.
NUMERIC KEYPADS
Device use for pointing, positioning, and drawing.
MOUSE
2 types of Mouse?
- Mechanical
- Optical
Small touch sensitive tablets. Used mainly in laptop computers
TOUCHPAD
indirect pressure of stick, buttons for selection on top or front like a trigger.
JOYSTICK
for laptop computer. Miniature joystick in the middle of the keyboard.
KEYBOARD NIPPLE
Detect the presence of finger or stylus on the screen.
TOUCH-SENSITIVE SCREEN
Control interface by eye gaze direction.
EYE GAZE
Four keys (up, down, right, left) on keyboard.
Inverted “T”.
CURSOR KEYS
number of pixels on screen.
Resolution
ratio between width and height.
Aspect Ratio
it tells how many different colors for each pixels.
Color Depth
diagonal lines that have discontinuities in due to horizontal raster scan process.
Jaggies
Softens edges by using shades of line color.
Anti-aliasing
Stream of electrons emitted from electron gun, focused and directed by magnetic fields, hit phosphor-coated screen which glows.
Cathode Ray Tube
Thin flexible sheets, updated electronically but retain display.
Digital Paper
Beeps , bongs, clonks, whistles and whirrs.
Used for error indications.
Sounds
Types of printers?(3)
- Dot-matrix printers
- Ink-Jet printers
- Laser printers
Can convert it all into a bitmap and sent to the printer.
Different fonts, bitmaps , lines , digital photos etc.
Page Description Languages
Aim of word processing, etc.
WYSIWYG (What you see is what you get).
Screen
and Page
Take paper and convert into a bitmap
Scanners
Two types: Flat-bed and Hand-held
Converts bitmap back into text.
Create problem for simple “Template matching” algorithms
Optical Character Recognition(OCR)
____ is the hardware in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device’s processor.
Random Access Memory (RAM)
is a type of non-volatile memory used in computers and other electronic devices.
Read-only Memory (ROM)
is a memory management technique where secondary memory can be used as if it were a part of the main memory.
Virtual Memory
Reduced amount of storage required
Compression
____ the law where is said that computers get faster and faster.
Moore’s Law
