Date   : Mon, 01 Jun 2009 23:14:52 -0700 (PDT)
From   : flynnjs@... (Jason Flynn G7OCD)
Subject: Teletext

> Surely a much more interesting idea to build a teletext
> generator and?  make your own pages. You could even
> dynamically pull information from, for example, RSS
> feeds to have "live" information on them.

I'm surprised Richard hasn't mentioned:
http://www.compulink.co.uk/~rrussell/tccgen/tccgen.html
which can store 4 pages of text.

Alternatively, there may be a project lurking on the
BATC archive (all past .pdfs now free) with a line 21
encoder.
There's plenty of open designs for PIC based test card
generators that could be tweaked to do line 21 data.