Input and Output

ergonomic keyboard

keyboard that separates the keys into two parts shaped like a wide "V." Some keyboards have a fixed layout, while others are movable. To the touch typist, the layout feels odd at first, but it puts less stress on the hands and wrist and winds up being comfortable for allot of people.

An inkjet printer

is a type of computer printer that creates a digital picture by propelling variable-sized droplets of ink onto paper. Inkjet printers are the most commonly used type of printer no a days and range from small inexpensive consumer models to a large professional machines.

A laser printer

is a printer that uses a focused light to transfer the text and image onto paper. Though contrary to popular belief, the laser does not actually burn the images onto the paper. Instead, as paper passes through the printer, the laser beam fires at the surface of a cylindrical drum called a photoreceptor. This drum has an electrical charge (typically positive), that is reversed in areas where the laser beam hits it. By reversing the charge in certain areas of the drum, the laser beam can print patterns (such as text and pictures) onto the photo receptor.

MICR

(Magnetic Ink Character Recognition) This machine recognition of numeric data printed with magnetically charged ink. It is used on most banks checks and deposit slips. MICR readers detect the characters and convert them into digital data. Although optical methods (OCR) became as sophisticated as the early MICR technology, magnetic ink is still used. It serves as a deterrent to fraud, because a photocopied check will not be printed with magnetic ink.

OCR ( optical-character recognition)

its an application software that allows a computer to recognize printed or written characters, e.g., messages numbers, punctuation marks, and pictograms using an optical scanner for input. Optical mark recognition (OMR) also employs an optical scanner, but does not employ a character recognition engine.

OMR( optical-mark recognition)

The operation of gathering data with an optical scanner by measuring the reflectivity of light at predetermined positions on a surface. OMR differs from optical character recognition (OCR), which requires a recognition engine in order to make sense of written characters.