Ah, other responses are indicating that this is really
about the the two Teletext supplementary sets of
graphic characters identified by Jim Agenbroad.
For those who want the full, gory details of *true*
Teletext, you might also view:
You will see why Teletext is mostly a matter of
hardware decoders embedded in televisions, rather than
the standard character conversion tables we see for
dealing with character sets.
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