Input and Output

Ergonomic keyboard.
- According to Wikipedia, an ergonomic keyboard is a computer keyboard designed with ergonomic considerations to minimize muscle strain and a host of related problems. 'Ergonomic considerations' is a phrase that can have many meanings so let's look at what a few of those are. Your hands, wrists, shoulders and back are the areas of your body most vulnerable to repetitive strain injury (RSI). This is due to how we sit and move about when using computers under normal circumstances.

Ink- jet printer.
- A type of printer that works by spraying ionized ink at a sheet of paper. Magnetized plates in the ink's path direct the ink onto the paper in the desired shapes. Ink-jet printers are capable of producing high quality print approaching that produced by laser printers. In general, the price of ink-jet printers is lower than that of laser printers. However, they are also considerably slower. Another drawback of ink-jet printers is that they require a special type of ink that is apt to smudge on inexpensive copier paper.

Laser printer.
- A printer that uses a laser and the electrophotographic method to print a full page at a time. The laser "paints" a charged drum with light, to which toner is applied and then transferred onto paper. This process can also be called electrophotographic.

Magnetic-ink character recognition.
- Magnetic Ink Character Recognition (MICR), as defined by the American National Standards Institute (ANSI), is the common machine language specification for the paper-based payment transfer system.  It consists of magnetic ink printed characters of a special design which can be recognized by high speed magnetic recognition equipment.  Line placement, character placement, skew and quality are several critical components of printing MICR; the line must be precisely positioned in the MICR Clear Band area. 

Optical-character recognition.
- Optical Character Recognition (OCR) uses a device that reads pencil marks and converts them into a computer-usable form. OCR technology recognizes characters on a source document using the optical properties of the equipment and media. OCR improves the accuracy of data collection and reduces the time required by human workers to enter the data.

Optical-mark recognition.
- Represents the process of capturing human-marked data from document forms such as surveys and tests.
Optical-mark recognition devices work with a dedicated scanner device that shines a beam of light onto the form paper. The contrasting reflectivity at predetermined positions on a page is then utilized to detect the marked areas because they reflect less light than the blank areas of the paper.