Differential Manchester encoding — Differential Manchester encoding, also called biphase mark code (BMC) or FM1, is a line code in which data and clock signals are combined to form a single 2 level self synchronizing data stream. It is a differential encoding, using the presence… … Wikipedia
History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… … Wikipedia
Magnetic developer — Applying Magnetic Developer to a magnetic stripe An example of damaged mag … Wikipedia
Card reader — A card reader is a data input device that reads data from a card shaped storage medium. Historically, paper or cardboard punched cards were used throughout the first several decades of the computer industry to store information and write programs … Wikipedia
Access control — is the ability to permit or deny the use of a particular resource by a particular entity. Access control mechanisms can be used in managing physical resources (such as a movie theater, to which only ticketholders should be admitted), logical… … Wikipedia
Hard disk drive — Hard drive redirects here. For other uses, see Hard drive (disambiguation). Hard disk drive Mechanical interior of a modern hard disk drive Date invented 24 December 1954 [1] … Wikipedia
Biphase mark code — The biphase mark code is a type of encoding for binary data streams. When a binary data stream is sent without modification via a channel, there can be long series of logical ones or zeros without any transitions which makes clock recovery and… … Wikipedia
Nerve guidance conduit — A nerve guidance conduit (also referred to as an artificial nerve conduit or artificial nerve graft, as opposed to an autograft) is an artificial means of guiding axonal regrowth to facilitate nerve regeneration and is one of several clinical… … Wikipedia
MM code — An MM code (the MM being an abbreviation for the German Moduliertes Merkmal ) is a machine readable modulated feature that has been added to German debit cards during manufacture as an anti counterfeiting measure since 1979. [cite… … Wikipedia
MetroCard (New York City) — MetroCard redirects here. For other cards, see MetroCard (disambiguation). Main article: New York City transit fares MetroCard Location New York City Launched 1993 … Wikipedia
Avantix Mobile — ( AVB ) is a portable railway ticket issuing system used across the British railway network. DevelopmentDevelopment started in 2000 by Sema Group plc, an IT services company which was acquired by Schlumberger Ltd in 2001 and became… … Wikipedia