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Input devices are hardware devices that allow data to be input into a computer. These devices range from common everyday items like keyboards to more specialized devices such as barcode readers and sensors.
Key Point: Input devices enable users to communicate with and control computer systems by entering data, commands, and instructions.
Keyboards are the most common input devices used to input text, numbers and instructions into computers. Most keyboards use the QWERTY layout, named after the first six letters on the top row of keys.
Example Uses:
Ctrl+P for printing or Prnt Scrn for screen captureErgonomic keyboards have been developed to reduce health-related problems associated with standard keyboards, such as:
These keyboards feature split and curved designs to support natural wrist positioning and reduce strain during extended typing sessions.
| Category | Details |
|---|---|
| Uses | Input data into applications software (text into word processors, numbers into spreadsheets); typing in commands (e.g., Ctrl+P) |
| Advantages | • Fast entry of new text • Well-tried technology • Easy to use • Easy to perform verification checks as data appears on screen |
| Disadvantages | • Hard for users with limited arm/wrist use • Slow compared to direct data entry methods (e.g., OMR) • Take up desk space |
Concept keyboards use icons or phrases instead of standard letters. Each key represents a specific item, icon, or phrase rather than a single letter.
Common Uses:
Example: In a shop, calculating tax on an invoice can be done by touching a single key labeled 'add tax' rather than typing out the command.
| Advantages |
|---|
| Fast data entry (no need to type whole commands) |
| Waterproof (useful in restaurants) |
| Tamper-proof (useful for unmanned kiosks) |
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