Input Output

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InputOutput Storage Devices
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Syllabus

• You must be able to identify and know the purpose
  and characteristics of the main hardware
  components of an ICT system including
• input devices, e.g. keyboard, mouse, scanner, bar
  code reader, sensor
• processors, e.g. central processing unit (CPU)
• output devices, e.g. screen, printer, speaker,
  motor
• ports and cables, e.g. parallel, serial,
  universal serial bus (USB)
• storage devices, e.g. RAM, hard drive, CD, DVD,
  floppy disk.
• Some systems use additional devices, e.g.
  networked systems need network interface
  cards(NICs) and systems accessing the internet
  may use a modem or broadband connection.

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Storage Devices - Definitions

• Storage - Computers store data either in chips
  inside the computer or on other media eg CDs.
  Storage in chips may be either ROM or RAM. When
  data is stored in a chip it is immediately
  accessible by the processor.
• ROM - Read only memory. Computer memory whose
  contents can be read but not altered.
• RAM - Random access memory. A fast, temporary
  memory area where programs and data are stored
  only while a computer is switched on.

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Keyboard to enter text
Mouse choose items from the menus
Monitor to see what is being done
Printer to get hard copy of adverts
Hard disk drive to store data
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2 or more computers linked together
Share programs/data Share printers
Network interface card, network cable
Logon password Encrypt files
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Keyboard Mouse scanner
Monitor Printer speaker
Processor, RAM, hard disk drive
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processor
RAM
Floppy disk
DVD
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Light sensor
Light/lamp/bulb
Automatic Comes on even if no-one at home
Automatic sprinklers coming on when ground is
dry Light coming on when people walk by
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Available technologies
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Syllabus

• internet technologies, e.g.. world wide web,
  e-mail, multimedia, encryption
• internet connections, e.g.. modem, broadband
• mobile phone technologies, e.g.. SMS, WAP, MMS
• digital broadcasting
• personal digital assistants (PDAs) and
  organisers
• storage media, e.g. DVD, minidisk mp3
• touch screen technologies.

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Definitions

• Internet - Worldwide network of computer
  networks. It is the largest connected set of
  computers in the world.
• World wide web - A system of file servers on the
  internet that supports pages in HTML and
  graphics, audio and video files,
• Internet service provider (ISP) - A company that
  provides a connection to the internet eg BT, NTL
• Broadband - A very high speed internet
  connection (usually cable)

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• MP3 - A file format for music files that makes
  use of compression
• SMS (simple message service) - Service that
  mobile phones use to send and receive short
  messages.
• WAP (wireless application protocol) - A mobile
  phone service that allows the phone to access the
  internet
• PDA (personal digital assistant) - A small
  computer used mainly for organising a busy
  schedule
• Video conferencing - Using computer equipment to
  conduct a virtual face to face meeting