The Rise and Fall of Teletext

Not even a mention of NAPLPS? This was the vector based protocol we used in Canada and I believe its description-based language was the precursor to HTML and therefore the internet as we know it. I was on the bleeding edge of this tech through the 1980's and unfortunately lost my shirt setting up shopping mall information systems. The downfall of NAPLPS was the high cost of the decoders I believe.