input and output devices

input and output devices

1. input

   • keynoard
     • a keyboard has keys that are labelled with characters set out in a pattern. it is used to enter characters such as letters, punctuations marks, numbers, and symbols. it can be used to enter commands into a computer or for typing letters, memos, reports or entering data into spreadsheets or database.
   • specialist keyboards
     • specialist keyboards have key labelled with characters set out in a different pattern from an ordinary keyboard or eith the raised marks of Braille to enter characters.
   • mouse
     • a mouse is used to move a pointer on screen and has one or more buttons that are clicked to choose items from an on-screen menu, and select items by clicking.
   • microphone
     • microphones convert sounds to electrical signals which can be digitised. they are used when talking on a mobile phone or when using videoconferencing or audio chat.
   • kay pad
     • a key pad has fewer keys than an ordinary keyboard: often only numbers and characters such as * and #. it can be used when entering the price or cost of an item.
   • touch pad
     • a touch pad is touch-sensitive panel that responds to fingers. It can be used instead of a mouse to move a pointer on screen or by tapping, which can act as a mouse click does.
   • remote control
     • remote controls input commands or instructions into computer systems or equipment and can be wired or wireless sending commands signals to devices such as TVs or wheelchairs. in business they can be used to control training equipment and TV displays.
   • scanner
     • scanners use reflected light from documents or photographs to capture a digital version of a document of image which can then be used in software applications such as word processors.
   • bar code reader or scanner
     • these can be lines or matrix of a bar code and convert them for input into a computer system. the captured bar code used to look up the details of an item in a database.
   • chip and PIN reader
     • the chip in the card is read in slot and there is a key pad for entering and PIN. A magnetic stripe reader is used if the chip cannot be read (or if a card has no chip). Card details are read from the card and checked using the PIN entered by the purchaser when using a credit or debt card is used.
   • magnetic stripe reader
     • read the data rom a magnetic stripe on the card when a card is 'swipped' through a slot in the
   • MIDI
   • Senor
   • camera