This should work fine on the composite output of the pi with no need for a modulator. At least here in Europe, where teletext is still very much a thing, it works from the external satellite receiver that’s connected this way.
It does, the first part of my post shows this on the TV. But for the BBC Micro I'd need to physically hack the Morley quite a bit to take composite input. I also have an Acorn Teletext Adapter, this can easily take composite instead of RF via a jumper.
Ah thanks for this clarification - I was wondering what the need was for the RF modulation and if it was necessary for just plain old TV use. Great project and thanks for bringing the possibility to my attention!
I knew a guy who did that with a microcontroller and hung it on the wall in the office, before data dashboards (or Pis for that matter) were really a thing.
I think a Mode 7 dashboard would really focus the mind on what's absolutely essential.
That's because modern digital standards (DVB-T/DVB-C/DVB-S/DVB-S2) actually added a way to encapsulate teletext data in the MPEG-2 TS stream inbetween usual MPEG2/H.264 and MP2/AC3/AAC audio tracks. Quite fascinating really.
