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optical disc
disque m optique

Optical disc. This disc is also called a video disc (or vision disc) and is read using a light beam (laser), and is used to store data.

The change in the way the light beam is reflected during the rotation of the disc is used to provide a binary code to display video on a video device, television screen or computer.

The compact disc is an optical disc with a diameter of about 5 inches (about 30 cm). The compact disc with readable memory (CD - ROM) is the most common format and is used in video devices and music listening devices as well as to store large amounts of fixed data. The interactive compact disc (1 - CD) is a new format for computer applications, also called WORM, meaning: write once and read many times, and it saves new data for unused parts of the disc. The capacity of the compact disc is about 600 megabytes.

Optical mark reader

Optical mark reader

Optical mark reader. This device does little more than detect the presence or absence of pencil marks in certain places on paper sheets or computer cards. It is sometimes directed to the locations to be read by means of timer marks, thick black lines printed on one edge. Examination boards often use optical mark readers to record candidates' answers to multiple-choice questions.

Oracle

Oracle. The name of the teletext service of the Independent Broadcasting Authority which sends data in addition to the broadcast of regular television programmes. Each page is sent in turn in an infinite series of dots that appear outside the field of vision at the top of the television screen. Using a teletext decoder, this data can be made to fill the screen, appearing above the picture, page after page. Oracle software includes advertising pages and provides local information by broadcasting different pages in different areas. Data from page 175 and onwards, when fed into special microcomputers, provides software for these machines. Software transmitted in this way is known as telesoftware.

OR gate
circuit m OU

A logic gate that operates on binary digits. Its output is a logical value of 1 when any of its inputs has a logical value of 1.

OR gate

For example, the following truth table applies to an OR gate with two inputs:

This is an inclusive OR gate, as opposed to an exclusive OR gate or non-equivalence gate, which outputs 0 if all of its inputs have a logical value of 1.

original equipment manufacturer (OEM)
constructeur m de matériel

Original equipment manufacturer. A term used to describe a manufacturer who produces a piece of equipment that may include products from other manufacturers and then sells it. In doing so, these other manufacturers can claim that their products are suitable for use by an original equipment manufacturer.
For example, an OEM for a particular type of printer might use a print head mechanism or integrated circuit made by another manufacturer.

OSI

Open Systems Interconnection.
Abbreviation for Open Systems Interconnection, a model developed by the International Organization for Standardization for networking that includes hardware and application software.