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Videotex example screen showing its graphics capabilities, 1978. As in teletext, predefined, fixed-width graphics characters in multiple colors could be used to create an image. Minitel was perhaps the most successful videotex service worldwide, using this terminal, c. 1982.
NAPLPS (North American Presentation Level Protocol Syntax) is a graphics language for use originally with videotex and teletext services. NAPLPS was developed from the Telidon system developed in Canada, with a small number of additions from AT&T Corporation.
In addition to sets of graphical characters and control characters, some Videotex formats included Picture Description Instructions (PDI) sets used for in-band vector graphics. The character sets used by Videotex are based, to greater or lesser extents, on ISO/IEC 2022.
1.7 Graphics character sets. 1.7.1 G1 block mosaics. 1.7.2 G3 smooth mosaics and line drawing. ... and used for the Viewdata and Teletext variants of Videotex in ...
The CRC had patented several of the technologies by the end of 1977; a touch-sensitive input mechanism, the basic graphics system, and the interactive graphics programming language. [3] By the mid-1970s several European countries were in the process of introducing videotex and teletext services.
In the early 1980s, a number of higher extension levels were envisaged for the specification, based on ideas then being promoted for worldwide videotex standards (telephone dial-up services offering a similar mix of text and graphics). The most common implementation is Level 1.5, which supports languages other than English. Virtually any TV ...
Teletel on a Thomson videotex terminal Minitel could be emulated on Linux with Xtel. Minitel utilized computer terminals featuring a text-only monochrome screen, a keyboard, and a modem, all integrated into a single tabletop unit. These terminals had the capability to display basic graphics using a predefined set of block graphics characters ...
Viewdata is a Videotex implementation. It is a type of information retrieval service in which a subscriber can access a remote database via a common carrier channel , request data and receive requested data on a video display over a separate channel.