General Theory Notes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Hardware: | is any physical part of a computer (it is a group of machines )
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| Hardware is made up of : | a) The CPU and Main Memory
b) Input Devices
c) Output Devices
d) Storage Devices
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| Main Memory: | stores programmes and data for processing.
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| CPU: | central processing unit. it is like the brain of the computer.
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| 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.
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| Output devices: | these accept information from the CPU and display the results for the user. Examples are: printer, monitor.
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| 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.
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| 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.
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| 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.
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| 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.
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| point for sale : | they are used to collect information on a product by scanning the bar code.
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| digitiser : | used for drawing illustations or creating graphics/pictures on a page.
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| VDE/Voice Data Entry : | it can accept human speech and convert it to the spoken word onto your screen.
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| Camera/Tape Recorder : | used to input voice or visual pictures on to your computer.
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| OCR : | Optical Character Reader. they are devices that scan the document and turn it into readable form on your screen.
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| MICR : | Magnetic Ink Character Reader.they are used when documents, contain magnetic digits that contain information.
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| OMR : | Optical Mark Recognition/Reader.The computer will pick up marks, e.g. pencil marks on a sheet to collect information.
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| Touch screen : | it is a special screen which alolows you to carry out a task by touching on the screen.
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| Light Pen or Stylus : | you can use a special pen to touch the
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
joannemurtagh10
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