Renseignements généraux

Nº de série

222

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

FERROUS METAL CASING/ SYNTHETIC CONTROLS & PARTS/ METAL & SYNTHETIC WORKING PARTS/ GLASS? INDICATOR LIGHTS/ NON-FERROUS METAL BACK PANEL

Dimensions

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

Longueur

43,2 cm

Largeur

37,0 cm

Hauteur

9,0 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

Norpak

Pays

Canada

État/province

Ontario

Ville

Kanata

Contexte

Pays

Canada

État/province

Ontario

Période

1980-1985

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.

Fonction

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. It was used specifically to decode Telidon graphics images, probably with Telidon keypad 1985.0383.002.

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. The Norpak Mark 1 decoder was an early field trial portrait prototype. It used quite a bit of electronics to do its work so its cost was significant.

Notes sur la région

Inconnu

Détails

Marques

DECAL ON UNDERSIDE READS 'norpak CANADA/ Model TELIDON/ Serial 222'/ WHITE LETTERING READING 'Telidon Terminal' or 'Norpak'/ WHITE PRINTED CONTROL FUNCTIONS ON FRONT & BACK/ GREY DECAL ON FRONT READING 'ASSET NUMBER/ 17685/ CRC SHIRLEY BAY'

Manque

S/O

Fini

CASING PAINTED WHITE WITH DARK BLUE FRONT & BACK/ WHITE & BLACK SYNTHETIC

Décoration

S/O