Renseignements généraux

Nº de série

1413

Nº de partie

1

Nombre total de parties

2

Ou

S/O

Brevets

S/O

Description générale

NON-FERROUS METAL CASING/ SYNTHETIC KNOBS, SOCKETS, BUTTONS, PARTS/ METAL & SYNTHETIC WORKING PARTS

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

58,9 cm

Largeur

35,5 cm

Hauteur

7,4 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Technologie informatique

Catégorie

Périphériques numériques

Sous-catégorie

S/O

Fabricant

Ou

Northern Telecom

Pays

Canada

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Canada

État/province

Ontario

Période

1982-1985

Canada

This decoder is part of Canadian developed Telidon videotex technology created by the Communications Research Centre. The Telidon program began on August 15, 1978 and ended on March 31, 1985. This decoder was designed and used for the Bell Vista field trial.

Fonction

This is a videotext decoder used to decode Telidon graphics images during the Bell Vista field trial. The purpose of a decoder is to take the communications data that's transmitted over narrow bandwidth line, which would be the telephone line in this case, and convert it to something that can be put on to a display screen.

Technique

This decoder used a microprocessor and a 1200 baud modem to decode and convert communications data code to something that was displayable on a television display screen. This decoder used a bit plane that is a dot by dot image structure. While the graphic was not high quality, it was quite reasonable and the code was designed to be capable of expanding to handle higher resolutions. The system was designed to be forward and backward compatible, meaning it had the capability of displaying existing and future images, taking advantage of lowering memory costs to improve Telidon technology over time. In 1983, the North American Presentation Level Protocol Syntax (NAPLPS) graphics language develop from the Canadian Telidon system was formalized, ratified and adopted as a world standard for graphics transmission by computer.

Notes sur la région

Inconnu

Détails

Marques

WHITE DECAL READING 'nt northern telecom/ Made in Canada/ Serial No. 1413/ L23/ LR46105'/ WHITE LETTERING ON FRONT READING 'TERMINAL VISTA TERMINAL'/ WHITE LETTERING ON FRONT & BLACK ON BACK FOR CONTROL FUNCTIONS/ DECAL ON BACK READING 'VERIFICATION-CR'

Manque

S/O

Fini

CASING PAINTED BLACK/ BLACK & RED SYNTHETIC

Décoration

RECTANGULAR BLACK SYNTHETIC PLATE ATTACHED TO FRONT ON WHICH IS A WHITE CIRCLE