Chapter 2: Input and Output Devices PDF

Here's a summary and key content points from the given material: **Chapter 2: Input and Output Devices** **2.0 Objectives** - Understand peripheral devices and their roles. - Learn about various input and output devices, their designs, features, advantages, and disadvantages. - Operat...

Here's a summary and key content points from the given material: **Chapter 2: Input and Output Devices** **2.0 Objectives** - Understand peripheral devices and their roles. - Learn about various input and output devices, their designs, features, advantages, and disadvantages. - Operate peripheral devices efficiently in practical scenarios. **2.1 Introduction** Peripheral devices facilitate communication between the computer and the external world: - **Input Devices**: Supply data/programs to the computer (e.g., keyboard, mouse). - **Output Devices**: Relay computer-generated information to users or storage (e.g., monitors, printers). - **I/O Interfaces**: Convert input data into machine-readable form and output into human-readable form. Data Input Methods: 1. **On-line Data Input**: Direct transfer to the computer. 2. **Off-line Data Input**: Data prepared and entered later. **2.2 Input Devices** **2.2.1 Punch Cards** - Data stored in cards using codes (e.g., Hollerith Code). - **Advantages**: Cheap, reliable. - **Disadvantages**: Not reusable, require careful handling and large storage. **2.2.2 Keyboard** - Standard input device; easy to use, inexpensive. - Keys: Letters, numbers, special functions (e.g., F1-F12, arrow keys). - Allows efficient data editing. **2.2.3 Mouse** - Pointing device for cursor movement. - Types: Mechanical, optical, optical-mechanical. **2.2.4 Light Pen** - Used for writing/sketching on screens. - Applications: CAD. **2.2.5 Joystick** - Converts movement into digital signals; used in gaming. **2.2.6 Trackball** - Sphere-based device for cursor control. **2.2.7 Touchscreen** - Transparent plate over CRT; registers touch input. - Types: Optical and electric. **2.2.8 Digitizer** - Converts graphical/pictorial data into digital form. - Types: Image scan and flatbed digitizers. **2.2.9 Scanner** - Types: Optical (OMR, OCR) and Magnetic Ink Character Recognition (MICR). - Reads text/images directly into memory. **2.2.10 Voice Recognition** - Converts speech to electrical signals. - **Advantages**: Reduces data entry cost, operator mobility. - **Disadvantages**: Operator-dependent, requires pre-stored vocabulary. **2.3 Output Devices** **2.3.1 Printers** - **Impact Printers**: Use mechanical hammers (e.g., dot matrix, daisy wheel, line printers). - **Non-Impact Printers**: Use modern technologies (e.g., inkjet, laser). **2.3.2 Plotter** - For graphs/drawings. - Types: Flatbed (X-Y) and Drum. **2.3.3 Video Display Terminal** - Types: CRT, Flat Panel Display (e.g., LCD, plasma screens). - Terminal types: Dumb, smart, intelligent. **2.3.4 Computer Output Microfilm (COM)** - Records data as microscopic images on film. - **Advantages**: Space-efficient, high-speed. - **Disadvantages**: Expensive, sophisticated. **2.4 Summary** Peripheral devices are categorized into input and output types: - Input devices like keyboards, mice, and scanners capture user data. - Output devices like printers and monitors present processed data. - Advanced I/O devices enhance interaction and efficiency. **2.5 Questions for Self-Study** 1. **Fill in the blanks**: - a\) \_\_\_\_\_\_\_\_ is an example of a picking device. - b\) \_\_\_\_\_\_\_\_ is an example of a pointing device. - c\) A digitizer is also known as a \_\_\_\_\_\_\_\_. 2. **Give full forms**: - MICR, OCR, OMR. 3. **Match the following**: - a\) Punch card: Hollerith Code. - b\) Bar code: Universal Product Code. - c\) Joystick: Computer games. - d\) Floppy Disk: Output devices. 4. **Short answers**: - Define a terminal and list types. - What is an impact printer? Name an example. This document can be used as a comprehensive guide or further refined. Would you like this formatted differently?