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29 Cards in this Set
- Front
- Back
Examples of Input devices
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Keyboard, Mouse, Joystick, Digital Camera, Scanner, Magnetic Stripe reader, Microphone
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Aim of Input Devices
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Put information on computer. Can be adapted so people with disabilities can use them.
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Examples of Output Devices
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Monitor (visual display unit), Printers(laser, inkjet, dot-matrix), Speakers, Control Devices(lights and buzzers)
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Aim of Output Devices
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Information off the computer. Can have a hard copy of the data.
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Hard Disks:
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Backing store. Large capacity. Items can be stored there when you switch off the computer.
Can crash - no computer. Fixed. |
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Floppy Disk
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about 2mb storage. Used to store + transfer data. Used to make backups. Used as additional storage. Old. Small capacity
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CD-ROM / DVD
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Used for encyclopaedia/resources
Can be transported. Good sound and picture quality. Can't be rewritten. |
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Magnetic Tape
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huge storage capacity- used to back up large volumes of data. Takes time to access specific point as you have to trawl through it
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Flash Memory (usb) stick
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Large Storage capacity. Can easily transfer data (files, pics and music) computer to computer.
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RAM and ROM
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Random access memorry - volatile; once gone its gone.
Read Only Memory - cannot be changes, used in bios |
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Why Do We Make Backups?
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Hard Disk Failure, Virus Infection, Lost usb/floppy disk, computer network failure, human error.
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Communication Devices:
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fax/phone/email/letter - share information/files/pics anywhere in the world.
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Types of data:
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Text: abc?![£ Numeric: 123 Date/Time: 20/01/2012 Boolean: TRUE or FALSE
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Data Keywords:
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field: e.g. date of birth or surname
record: group of fields Key field: unique key/number for individual people. |
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Software:
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Something that doesn't physically exist - viewed on computer- makes it work e.g.microsoft word / Adobe Photoshop
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Hardware:
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Something you can touch e.g. keyboard / cpu / monitor
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licenses
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single user (1 person)
multi user (few people e.g. family) site (e.g. school) |
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Piracy
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Illegal: sharing, lending, using something without permission.
e.g.music, pictures, software can get away with it (pics) if its for an educational non profit use. |
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Computers in Everyday Lives
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credit cards, computerised statement letters, monitoring availability + cost of an item, ATM's can be misused
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Internet
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Internet: international collection of computers connected by communication lines using internet service providers (isp's)
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World Wide Web
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A collection of pages capable of being accessed over the internet with links to other pages
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URL:
HTML: |
Uniform Resource Locator
(http://www.bbc.co.uk) Hyper marked Text Language |
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Virus'
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Attatches itself to another program/file, can cause damage to programs + files, spread: email, websites, downloads
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Magnetic Ink Character Recognition (micr)
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cheques - checks sort code and process cheques. very expensive equipment
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Optical Mark Reader (OMR)
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lottery tickets: make a choice and computer easily and quickly recognises this. Very accurate + quick, badly damaged files can't be used
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Optical Character Reader (OCR)
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Like a scanner but instead of an image you get characters which can be transferred to word doc. Get computerised copy. Can't always recognise characters.
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Bar Code Reader
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Fast way to input data. Used in shops. Very expensive to use.
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CD-R and CD-RW
(CD recordable and CD rewritable) |
CD-R can be written on once
CD-RW can be written on and deleted off as many times as you like. |
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Computer Aided Learning (Cal)
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e.g. powerpoints, videos Can use wide range of media. Student can electronically access and hand in work. Interesting. Expensive. Less personal
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