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Thursday 23 June 2011

Input and Output



ERGONOMIC KEYBOARD: It is a computer keyboard designed safe and comfortable machine for human that is ergonomic, It plays an important role in design of the keyboard as well as monitors beacuse it slows down the muscle strain and backaches. It is a V shape keyboard.


INK-JET PRINTER: It is a printer that creates digital image by driving the droplets of ink into paper. It's has been manufactured into the printer nowadays and more advance since early 1950s and we still use it ever since.


LASER PRINTER: A computer printer but the difference of this printer is that it prints high printer text and graphics on a paper as it is laser printers. It can photocopy papers too and it can direct image scan by a laser beam  across the printer's receptor. This laser printer is fast and used in business and consumer markets.


MAGNETIC-INK CHARACTER: MICR is use mostly in cheques. This ink allows the computer read the account numbers off printed documents.
MICR codes can be read by humans as well as computers. It's character produce a unique waveform that can be easily identified by the system.


OPTICAL-CHARACTER RECOGNITION:  Called OCR for short. This OCR can read texts from paper and so the computer can manipulate it. When you use word processor, the OCR can have a sofware that receive images and can read text in many portions of fonts. If you write in hand, it can be a bit difficult as well.


OPTICAL-MARK RECOGNITION:OMR works in extracting data from documents such as checkboxes. It is useful and scans printed form ada records where the marks are made on the form. It is usally used in tests and surveys.

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