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General Theory Notes

Hardware: is any physical part of a computer (it is a group of machines )
Hardware is made up of : a) The CPU and Main Memory b) Input Devices c) Output Devices d) Storage Devices
Main Memory: stores programmes and data for processing.
CPU: central processing unit. it is like the brain of the computer.
Input devices: these devices read incoming data and pass it on to the CPU. Examples are : keyboard ,disk drive ,scanner ,bar code reader , voice recognition , and digital camera.
Output devices: these accept information from the CPU and display the results for the user. Examples are: printer, monitor.
Storages devices : these keep information and instructions in the computer so that they can be used again. Examples are : CD’s, floppy disks, hard drive.
Mouse : Used to select text, insert text or an icon on page by clicking and dragging. The cursor changes shape depending on the task. E.g arrow, beam, egg timer shapes.
Keyboard : Used to type words on the page. The most common type is a QWERTY keyboard; it is laid out in an ‘unfriendly’ manner, in order to slow down speed typists. The most commonly used letters are spaced out to avoid them sticking.
Bar code reader/wand reader or scanner: They read or scan the zebra like bars that you see on most products. The black and white bars are different widths and together they form a code called a UPU or Universal product code.
point for sale : they are used to collect information on a product by scanning the bar code.
digitiser : used for drawing illustations or creating graphics/pictures on a page.
VDE/Voice Data Entry : it can accept human speech and convert it to the spoken word onto your screen.
Camera/Tape Recorder : used to input voice or visual pictures on to your computer.
OCR : Optical Character Reader. they are devices that scan the document and turn it into readable form on your screen.
MICR : Magnetic Ink Character Reader.they are used when documents, contain magnetic digits that contain information.
OMR : Optical Mark Recognition/Reader.The computer will pick up marks, e.g. pencil marks on a sheet to collect information.
Touch screen : it is a special screen which alolows you to carry out a task by touching on the screen.
Light Pen or Stylus : you can use a special pen to touch the
Created by: joannemurtagh10