The "analogue" look of genuine teletext that's often missing from emulators is caused by hardware character rounding in the http://en.wikipedia.org/wiki/Mullard

The "analogue" look of genuine teletext that's often missing from emulators is caused by hardware character rounding in the http://en.wikipedia.org/wiki/Mullard_SAA5050 http://en.wikipedia.org/wiki/Mullard_SAA5050 (see the datasheet linked from that page). That said, I don't think that effect is being correctly emulated here either. It's just that the video has been resampled (the pixels aren't 1:1 with the original) which produces a somewhat similar effect.