Input and Output Devices: A Comprehensive Guide for Understanding Computers, Slides of Computer Fundamentals

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Chapter 4:

Input and Output

Learning Objectives

1. Explain the purpose of a computer keyboard and the types of keyboards widely used today.
2. List several different pointing devices and describe their functions.
3. Describe the purposes of scanners and readers and list some types of scanners and readers in use today.
4. Explain what digital cameras are and how they are used today.
5. Understand the devices that can be used for audio input.
6. Describe the characteristics of a display device and explain some of the technologies used to display images.
7. List several types of printers and explain their function.
8. Identify the hardware devices typically used for audio output. Understanding Computers: Today and Tomorrow, 14th Edition 2 2

Keyboards

• (^) Keyboard
  • (^) An input device used to enter characters at the location marked by the insertion point or cursor
  • (^) Can be wired or wireless
  • (^) Most computers today are designed to be used with a keyboard
  • (^) Typically contains:
    • (^) Standard alphanumeric keys
    • (^) Numeric keypad
    • (^) Function keys
    • (^) Delete and Backspace keys
    • (^) Control and Alternate keys
    • (^) Arrow directional keys and special keys

Keyboards

Pointing and Touch Devices

• (^) Pointing Devices are used to:
  • (^) Select and manipulate objects
  • (^) Input data
  • (^) Issue commands to the computer
• (^) Common Types of Pointing Devices:
  • (^) Mouse
  • (^) Pen/stylus
  • (^) Touch screen

Pointing and Touch Devices

• (^) Mice
  • (^) Mouse
    • (^) Common pointing device that the user slides along a flat surface to move a pointer around the screen and clicks its buttons to make selections
    • (^) Older mechanical mice use a ball
    • (^) Optical or laser mice track with light
      • (^) 3D mice
      • (^) Can be wireless

Pointing and Touch Devices

• (^) Pens/Styluses
  • (^) Stylus
    • (^) Pen-like device used to draw or write electronically on the screen
    • (^) Also called digital pen, electronic pen, tablet pen
    • (^) Pen input is being used for
      • (^) Photography, graphic design, animation
      • (^) Industrial design, document processing, and healthcare applications
      • (^) Issuing commands and inputting data

Pointing and Touch Devices

• (^) Pen-Based Computers
  • (^) Pen input used with mobile devices and tablet computers - (^) Used to input handwritten text and sketches and to manipulate text - (^) If handwriting recognition is used, written text can be converted to editable typed text

Pointing and Touch Devices

• (^) Digital Writing Systems
  • (^) Pen-based systems that capture handwritten input as it is being written
  • (^) Requires special paper with a grid of dots
  • (^) Handwritten input can be transferred to computer
• (^) Graphics Tablets
  • (^) Pen tablets or digitizing devices
  • (^) Flat, touch sensitive tablet typically connected to computer using a USB port

Pointing and Touch Devices

• (^) Signature Capture Devices
  • (^) Found at check out counters to record customer signatures

Pointing and Touch Devices

Pointing and Touch Devices

• (^) Other Pointing Devices - (^) Joysticks, gamepads, and other gaming devices - (^) Trackballs - (^) Buttons and wheels - (^) Touch pads

Scanners, Readers, and Digital

Cameras

• (^) Source Documents
  • (^) Containing data that already exists in physical form (order form, photograph, invoice, check, or price label)
• (^) Source Data Automation
  • (^) Captures data directly from a source document - (^) Saves time - (^) Increases accuracy - (^) Utilizes scanning or reading devices

Scanners, Readers, and Digital

Cameras

• (^) Scanners (Optical Scanners)
  • (^) Input devices that capture an image of an object and transfers it to a computer in digital form
  • (^) Can scan photos, documents, drawings (flat objects)
  • (^) Data is typically input as a single image
  • (^) If optical character recognition (OCR) is used, text is input as individual text characters
  • (^) Types of scanners
    • (^) Flatbed
    • (^) Portable
    • (^) 3D
    • (^) Integrated (ATMs, etc.)