Newman, HannahJ. L. Encarnacao2015-09-292015-09-2919811017-4656https://doi.org/10.2312/eg.19811024Videotex is a system by which information can be accessed from central data bases by the general public. By the use of a television receiver augmented by a micro-computer controlled interface device, a user can access pages of information over a communications medium. Telidon uses a coding method for the transmission of graphical and textual information which is device and communication channel independent. Pictures are encoded using geometric primitives called Picture Description Instructions. Standards for graphics metafiles are being developed. Cornpatibility of Telidon and computer graphics can be obtained by developing a graphics metafile in which the requirements for both are satisfied.10.2312/eg.19811024