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Hardwer notes
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Hardware P.g. 103-109 Scanners A scanner enables you to import a digitised image of a photograph, picture or piece of text and incorporate it in a word processor or DTP program. · Scan pictures and diagrams for inclusion in other applications (presentation, DTP, word processing) · Scan text that you want to include in departmental documents or learning materials. Optical Character Recognition (OCR) Uses an ordinary scanner to take a photographic image of printed or even hand-written text. Special software then looks at the image, recognises each character and converts it into a text file. This can then be edited using a word processor. It is also used to automatically recognise postcodes on letters at sorting offices. Optical Mark Reader (OMR) Similar to a bar code reader but uses infra-red light to scan pencil marks on prepared forms such as multiple-choice examination answer sheets or lottery tickets. Magnetic Ink Character Recognition (MICR) Uses ink containing magnetic particles. This method is used by banks to print on a cheque the amount that it is made out for, then it is scanned into a computer. Digital cameras · Take and store photographs of places of worship visited with pupils. Use with pupils as part of the preparation for a visit. · Include pictures (as above) in worksheets, for pupils to label name, significance and use of key features. · Record pictures of pupils on trips or engaged in activities for use in flyers, displays etc. Bar Code Reader Almost everything you buy has a bar code either on it or on its packaging. The bar-coded item is wiped over a laser scanner or a wand is wiped over the bar code to read in the data. It is the same as a scanner but due to the simple nature of the bar code the scanning is very rapid. Used at supermarket checkouts and some libraries. Mouse The movement of the mouse over a flat surface is mirrored by a pointer on the monitor screen. Under the mouse is a ball, which rolls and turns two shafts, one for each direction - left/right & up/down. Buttons on the mouse enable selections to be made from menus, movement of objects around the screen, and painting or drawing. Keyboard The commonest way to enter data into a computer. Each key is simply a switch, which when pressed, results in a digital code being sent to the computer. For example, pressing the 'A' key produces the code 01100001 representing the lower case letter 'a'. Holding down the shift key at the same time produces the code 01000001 representing the upper case letter 'A'. Floppy Discs A storage device consisting of a light, flexible disc enclosed in a cardboard or plastic jacket. The disc is placed in a disc drive, where it rotates at high speed. Data are recorded magnetically on one or both surfaces. Floppy discs are inexpensive, and light enough to send through the post, but have slower access speeds and are more fragile than hard discs. Hard Disc A storage device usually consisting of a rigid metal disc coated with a magnetic material.
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