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Input And Output Devices
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Five factors you should consider when assessing the suitability of hardware device for connecting to a computer is;
Speed,
Cost,
Security,
Capacity,
Reliability.
When installing a new component into a computer system the tasks involved are;
Add the component to the computer, either connecting in through an existing port or plugging it into an expansion slot in the motherboard.
The available ports on most computers include serial, parallel and universal serial bus (USB).
Install and configure the driver software that allows the computer to communicate with the new component.
Input device
Types
Speed
Reliability
Robustness
Keyboard
QWERTY Keyboard
Up to 10 characters per second
Good – very reliable all keys typed appear on screen
Moderate – easily damaged by rough handling and spills
Mouse
Accupoint mouse
Moderate – can be affected by dust, dirt and bright sunlight
Moderate – damaged
Barcode Scanner
Up to 50 characters per second – depends on the operator
Good – relied on by retail stores, although hard to read if icy or dirty
Depends on type – supermarket scanners far more robust than hand-held scanners
Light Pen
Up to 50 characters per second – depends on operator
Good – relied on by libraries and video stores
Good – generally well constructed and difficult to damage
Touch-sensitive screen
Slow, up to 5 characters per second – limited by the operator
Good – accurate indication of position touched
Good – rugged construction for use in public places
Joystick
Accupoint joystick
Slow (cannot be measured in characters per second) – limited by the operator
Good – mechanically simple, with operator compensating for any slight inaccuracies
Good – simple design, so relatively difficult to damage
Video Digitiser
Slow (cannot be measured in characters per second)
Moderate to good – depends on range