Chapter 3. Hardware Basics: Peripherals. Chapter Outline. Input: From Person to Processor Output: From Pulses to People Storage Devices: Input meets Output Computer Systems: The Sum of Its Parts. “We swim in a sea of information.” Gary Snyder, poet. Input: From Person to Processor.
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Hardware Basics: Peripherals
“We swim in a sea of information.”
Gary Snyder, poet
The most common input device is the keyboard, which is used to enter letters, numbers and special characters.
Head Controlled Mouse
Sip and Puff Mouse
Input devices “read” directly from paper and convert printed information into bit patterns that can be processed by the computer.
Digital cameras capture snapshots and store them as bit patterns on disks or other storage media.
Video digitizers capture input from video sources such as video camera and convert it to a digital signal that can be stored in memory and displayed on a computer screen.
CRT (cathode ray tube)
LCD (liquid crystal display)
Output devices take bit patterns and turn them into non-digital movements.
Optical disk drive uses laser beams to read and write bits of information on the disk surface.
Flash memory is an erasable memory chip.
With the open architecture of the PC and the introduction of new interfaces, you can hot swap devices.