Chapter 2 Flashcards
(22 cards)
What are the four components of hardware?
- input devices
- CPU
- output devices
- memory
What is ‘bit’ short for?
Binary digit
How many bits has 2^8 values?
8
How many possible values do 5 bits hold?
2^5
What does ASCII stand for?
American Standard Code Information Interchange
What is ASCII for?
For characters; there is a set code for each specific character.
Define input.
Data or instructions that enter the memory.
What are the properties of computer hardware?
Physical and tangible
Define input device
Devices that allow the user to key in instructions and data
Define data
Unprocessed audio, video, images, text or numbers
Define instruction
Programs commands and user responses
What is a keyboard?
A device that keys in numbers, letters and allows shift, tab, Caps Lock among other functions.
What type of device controls the cursor?
The pointing device.
Describe the mouse
It fits under your palm and uses a rubber ball
Describe The optical mouse
Uses light to sense movement
Describe the trackball
Remains stationary except you rotate the ball
What are the properties of the touchpad?
The touchpad is sensitive to pressure and motion.
Describe the joy stick
A vertical lever as a pointing device.
What’s a pointing stick?
A small button often in the middle of a keyboard used to control the cursor using a finger
Is touch screen a pointing device?
Yes, because it allows the user to interact with the interface.
List the 7 pointing devices.
Mouse Optical Mouse Track ball Touchpad Joystick Pointing stick Touchscreen
What is MIDI?
Musical instrument Digital Interface.
