input output Flashcards
What are ‘input devices’?
Hardware devices that allow data to be entered into a computer
What are the two types of input devices?
Manual input devices
Direct input devices
Manual input devices
Data is input into the computer by hand (people have to do most of the work).
Keyboard
Text, numbers and instructions
Used to input data into applications
Used to enter commands into the computer.
Numeric keypads
Used to enter numbers into a computer system
- Used in: ATMs, telephones, chip and pin devices
Joysticks
Similar functions to mice and trackballs. has buttons
Can control characters or objects in video games
Can control industrial machinery
Used in simulators.
wheelchair
Pointing devices uses
Used to control a cursor on a screen.
Opening, closing, maximising and minimising programs and files Moving, grouping and deleting files Using applications Touchpad: Mice: Tracker ball:
Touch screens
Input commands into a computer by pressing or touching buttons / icons on the screen removes the need to use a mouse.
2 types of touch screen
Resistive
capacitive
Resistive touch screen
Sensitive to pressure (can use glove)
Capacitive touch screen
Sensitive to static electricity (no glove)
Keyboard advantages
Fast entry of new text into a document.
Well-known method.
Easy to use for most people.
Easier to do verification checks as data is entered (can immediately compare the source document with typed data on the screen).
Keyboard disadvantages
It can be difficult to use if the user has limited arm/wrist use.
Slow method when compared to direct data entry.
It is a fairly large device that uses up valuable desk space.
numeric keypad advantage
adv
Faster than standard keyboards when entering numeric data.
Because many are small devices, they are very easy to carry around.
mouse advantage
It is a faster method for choosing an option than a keyboard.
It’s a very quick way of navigating through applications and the internet.
Does not need a large desk area when compared to a keyboard.
numeric keypad disadvantage
dis
Sometimes, they have small keys, which can make input more difficult.
Sometimes, the order of the numbers on the keypad is not intuitive.
mouse disadvantage
It can be more difficult for people with restricted hand/wrist movement than using a keyboard for data entry.
Easy to damage, the older type of mouse quickly becomes clogged up with dirt.
Difficult to use if no flat surface is readily available.
tracker ball advantage
Does not need the same fine control as a mouse.
It is easier to use than a mouse if the operator has problems with their wrist.
More accurately position the pointer on the screen.
Needs less desk space than a mouse or keyboard.
trackerball disadvantage
It is not supplied with the computer as a standard; therefore, it is more costly.
Users may need training because it is not standard equipment.
remote control advantage
It can be operated from any reasonable distance.
In some conditions, e.g., in chemically hazardous environments, we can control and measure from safe distances.
remote control disadvantage
Difficult to use for people with limited hand/wrist movements.
Physical obstacles can easily block the signal.
remote control uses
Uses:
Televisions, satellite systems, DVD/Blu-ray players and Hi-Fi systems, to alter controls such as volume, on/off, etc. Used to control multimedia systems. Used in industrial applications to remotely control processes.
joystick use
game
aircraft control
wheelchair
disadvantage
more difficult to control fine movement of pointer on screen than mouse
driving wheel advantage
(in racing game )
control movement more accurately than mouse or joystick
force feedback can be added to simulate road
driving wheel disadvantage
only one purpose
more elements is expensive such as force feedback and gears
touch screen advantage
intutive
space saving input and oupt is same device
cost effective for shop cause self service
faster entry than keyboard or mouse
