What is Telidon? Explore Telidon and its History

A woman sits with a stylus in her hand drawing a Telidon image with a tablet.

Telidon was a networked computer graphic system developed in a lab by the Canadian government, a decade before the World Wide Web. Ahead of its time, it enabled users to interact with information from home using televisions connected to phone lines and special Telidon hardware. Throughout the 1980s, artists experimented with Telidon, creating some of Canada’s first computer art.

1969

Canada's Department of Communications is established

Headed by Canada's first Minister of Communications, Eric Kierans, the Department of Communications begins research and development on Telidon in collaboration with Communications Research Centre Canada (CRC).
Norpak Ltd.'s MK1 model.
A product photograph of Norpak Ltd.'s MK1, an early Telidon terminal which included a regular television, a Telidon decoder, and a keypad.
1975

Hardware development

The CRC contracts Ontario-based data transmission company, Norpak Ltd., to develop interactive colour display technology that would become Telidon hardware.
Telidon's earliest developers stand around a Telidon terminal.
Herb Brown (left) with his research team, Bob Warburton, Bill Sawchuk, Doug O’Brien, and John Storey. They are responsible for Telidon’s earliest development at the Canadian Communications Research Centre.
1978

Public announcement

At its first public demonstration of a Telidon terminal, the Department of Communications announces a 4-year Telidon development program.
1979

Creating content

Instructions for the Telidon Videotex System are published, providing detailed descriptions of the code used to create images on a Telidon terminal.
1980

Artists discover Telidon

Animation artist Pierre Moretti creates the first Telidon artwork with support from the National Film Board of Canada.

The name Telidon, combines Greek words meaning "to know" and "at a distance".

Video Transcript +

'Knowledge at your fingertips!'

Watch a 1983 CBC news broadcast that captures the excitement that accompanied the introduction of Telidon to public audiences. The new information system is described by Angela Bourgeois, from the Department of Communications, as "interactive TV" and "the next big thing in communications".

Video Transcript +

Telidon on TVO

Bits and Bytes was an educational 12 part computer series, produced by TVOntario in 1983. The clip featured here is drawn from the final episode of the program, titled “What Next?”. It explains how Telidon works and includes an array of Telidon graphics.

Note: This video contains scenes that may potentially trigger seizures for people with photosensitive epilepsy. Viewer discretion is advised.

The Telidon Information Network

Transmitting information over telephone lines.

By dialing up central databases Telidon users could both retrieve and input data directly through their TVs to perform various activities. This interactive capability, along with its unheard of ability to transmit graphics over telephone lines, made Telidon a conceptual forerunner to the graphic user interface of the web and the modern internet.

A diagram of the components of a Telidon network including an image of a television, with arrows that point to a telephone, a computer database, and a computer on a desk.
This schematic demonstrates the transmission of information in a Telidon system. The user or "Information Consumer" selects a page they would like to view using the system's keypad. Their command is captured by the Telidon terminal, which transfers data over the user's home telephone line. Information is drawn from a central database, which is populated with content via an information provider, like Microtel or Infomart.