Input And Output Devices Flashcards
Input devices
A device that is used to enter information into a PC by typing, selecting, importing or downloading
Examples: Keyboard Mouse Magnetic strip reader Trackball Scanner Joy sticks Digital camera and webcam Digitiser Bar code reader Microphone Touchscreen Light pen Scanner KVM switch
Classification of input devices
Basic input devices: become essential to operate a PC. Always required for basic input operations. Eg keyboard, mouse, microphone
Special input devices: not essential to operate a PC. Required for special input operations. Eg scanner, digital camera, touch screen, light pen, trackball, joystick, digitiser, bar code reader.
Most recent input devices
NFC devices Facial recognition scanners Finger print scanners Voice recognition scanners Virtual reality headset
Output devices
Takes binary information form the computer and converts it into a form that is easily understood by the user
Monitors Speakers Speech synthesiser Printers Touch screens VR headsets Plotters Projectors
Classification of output devices
Basic output devices: devices essential to hey output on a PC. They are mostly required for basic output operations. Eg monitor, printer, speakers/headphones
Special output devices: devices requires for special types of output. Eg plotters
Von Neumann Architecture
Describes a design architecture for a computer with a processing unit consisting of: Arithmetic logic unit Control unit Memory Input and output mechanisms
Difference between storage and memory
Memory stores data short term for immediate access. Volatile
Storage stores data long term for permanent access. Non volatile
Accessibility
Refers to how much easy a system is by disabled people. Examples:
Voice recognition software and speech to text software
Screen reader. For blind people
Screen magnifier. For low vision people
On Screen keyboard. Use joystick or printed device
Health, safety and the environment
Ergonomics is the study of people’s efficency in their working environment.
Ergonomic keyboard: a keyboard designed to minimise the stress on the users body. It may have a built-in palm or wrist support.
Practices for a good working environment
Appropriate positioning of monitors, keybkards and adjustable chairs
A mouse mat
Monitor filter
Provision of adequate lighting and ventilation
Frequent breaks away from the computer
Chair should support your back in an upright and relaxed arch position
Health problems associated with using a computer
Injuries to writs caused by prolonged tylinh
Eye strain caused by screen glare
Back problems associated with poor sitting or bad posture
