How did ceefax work?

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Tags

  1. #packet
  2. #periods
  3. #where
  4. #blanking
  5. #teletext
  6. #encodes
  7. #vertical
  8. #ceefax
  9. #system
  10. #bytes
  11. #video
  12. #first
  13. #protocol
  14. #signal
  15. #normally