General Information

Serial #

1413

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

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

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

58.9 cm

Width

35.5 cm

Height

7.4 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Computing Technology

Category

Digital peripheral devices

Sub-Category

N/A

Manufacturer

AKA

Northern Telecom

Country

Canada

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

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.

Function

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.

Technical

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.

Area Notes

Unknown

Details

Markings

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'

Missing

N/A

Finish

CASING PAINTED BLACK/ BLACK & RED SYNTHETIC

Decoration

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