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December 6, 2009
by Al

Generating Teletext in Software

It has long been known that commodity PC graphics cards can, with a custom modeline, generate an “almost” PAL video signal. You only need to use a simple sync converter to get a picture on most TV sets. This allows you to skip the TV out filter (if you even have one) and control the signal more or less however you want. I wondered if this would be good enough to feed a teletext signal into the TV set, and it turns out that it is.