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Hardware:Input / Output Devices
Topics to be discussed…..
Input Devices Output Devices BIOS Input Output Storage Devices Sequential vs. Random Access Storage Storage Technologies: Magnetic and Optical
Input Devices An input device is any hardware component that allows you
to enter data and instructions onto a computer. Six Widely used input devices are the keyboard, mouse, microphone, scanner, digital camera and PC video camera.
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Output Devices
An output device is any hardware component that conveys information to one or more people. Three commonly used output devices are a printer, a monitor and speakers.
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BIOS
Acronym for basic input/output system, the built-in software that determines what a computer can do without accessing programs from a disk. On PCs, the BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions.
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Input
Input is any data entered into the computer’s memory. Types of input include:
◦ Data – Unorganized information (words, numbers, images, or sounds) that the computer converts to meaningful information
◦ Software – Programs transferred from storage devices to the computer’s memory
◦ Commands – Instructions that tell the computer what to do
◦ Responses – Prompts requiring user feedback
Input Devices• Input device captures information and translates it into a form that can be processed and used by other parts of your computer. KeyboardsPointing devicesGame controllersScannersStylusesMicrophonesDigital camerasWeb cams
p. 5.130 Fig. 5-1
SimNet Concepts Support CD: “Overview of Input Devices” and “Other Everyday Input Devices”
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Output
What is Output?
Output is data that has been processed into a useful form.
Output devicesMonitors:
screens or Visual Display Units (VDUs)display the effects of what the user is doingcan vary in size and resolution.
Printers:produce a paper copy of the user’s work: a ‘hard copy’come in three main types: laser, inkjet and dot matrix. Some businesses also use plotters.
Sometimes we just need to see the information, on screen or on paper, so we
use a monitor or a printer.
Device Benefits
CRT Cheapest monitor to buy; gives a sharp picture
LCD Slim screen; Used for laptops and digital display
TFT Slim screen; quick to refresh because each pixel has its own transistor
Speakers Good for loud music; can address a whole room
Headphones Can listen without disturbing others; good for private conversation
Laser Quick and best quality printer; large paper tray
Inkjet Cheap colour printing; good for printing photos
Dot matrix Impact printer; good for multi-part forms
Plotter Large drawing size; clear lines for technical drawings
Control Safe in all conditions; good for repetitive tasks
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Storage Devices Storage devices are categorized by:
◦The type of operations they perform
◦The method they use to access the information
◦The technology they use
◦Their location in the storage hierarchy
◦Their capacity and speed
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Sequential vs. Random Access Storage
Sequential – Storage devices that read and write data in a serial (one after the other) fashion
Random-Access – Storage devices that read and write data without going through a sequence of locations
Tape Drive – sequential storage
Hard Disk – random-access storage
Floppy Disk Drive – random-access storage
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Storage Technologies: Magnetic and Optical
Magnetic – Storage devices use disks or tapes that are coated with magnetically sensitive material
Optical – Storage devices that use laser beams to read patterns etched into plastic disks
Magnetic Storage Optical Storage – CD/DVD drive
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Thank You