Input Devices in Computer Systems
Input devices are essential components that allow users to interact with a computer by providing data and commands. Below are some common input devices:
Keyboard:
- A fundamental input device used for data entry through keys.
- Keyboards typically come in two sizes: 84 keys and 101/102 keys, with some variations including 104 and 108 keys.
- Types:
- QWERTY Keyboard: The most commonly used layout, named for the first six letters in the top row.
- AZERTY Keyboard: Primarily used in France, featuring a different arrangement of keys for specific languages.
Mouse:
- A popular pointing device that controls the cursor on a graphical user interface (GUI).
- It features two buttons (left and right) and a wheel for navigation.
Joystick:
- A pointing device that allows users to move the cursor in multiple directions, often used in gaming applications.
Light Pen:
- A stylus-like device used to interact directly with the screen by selecting menu items or drawing.
Scanner:
- An input device that converts physical documents and images into digital format for display and editing on a computer.
Barcode Reader (BCR):
- A device that reads barcoded data, commonly used for inventory and product identification by converting barcodes into alphanumeric values.
Microphone:
- An audio input device that captures sound vibrations and converts them into digital audio signals for recording or communication.
Optical Mark Reader (OMR):
- A specialized scanner that detects marks made by pen or pencil, widely used in examination answer sheets for multiple-choice questions.
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