Renseignements généraux

Nº de série

6580

Nº de partie

1

Nombre total de parties

2

Ou

S/O

Brevets

S/O

Description générale

FERROUS METAL CASING/ SYNTHETIC CONTROLS & PARTS/ METAL PARTS

Dimensions

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

Longueur

48,8 cm

Largeur

31,5 cm

Hauteur

8,5 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

CA.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.

Fonction

This is a third-generation videotext decoder used to decode Telidon graphics images. 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. The Norpak Mark 3 decoder was broadly distributed as part of the field trials. It used a fixed color map in order to cut purchase cost. The board is was designed around was also used in other Telidon terminals like the Electrohome TELCO-R-NK.

Notes sur la région

Inconnu

Détails

Marques

WHITE LETTERING ON FRONT READING 'Telidon' & 'norpak' & ON BACK 'norpak' & 'Made in Canada'/ DECAL ON BACK READS 'SA LR 49159/ MODEL TLD-MK3/ SERIAL 6580'/ DECAL READING 'VERIFICATION-CRC/ 23717'

Manque

S/O

Fini

CASING PAINTED DARK NAVY BLUE/ CASING FRONT & BACK PAINTED DARK GREY/ BLACK & WHITE SYNTHETIC/ PLATED PARTS

Décoration

WHITE OUTLINE MAPLE LEAF, ABOVE & BELOW IT A PAIR OF WHITE LINES ACROSS FRONT