Playing DOOM Teletext Old TV
Playing DOOM on a ring is one thing, seeing the Doomguy in Teletext is another. Put simply, DOOM-Teletext generates a stream that contains rendering of the FPS and that data can be transmitted to applications capable of processing teletext packet streams – either to an real TVs or displayed as pages on a computer.



The data that contains the broadcast signal is essentially hidden in the invisible vertical blanking interval area, and since teletext is based on unidirectional data transmission, only 4×4 pixels of DOOM can be combined into a single teletext-pixel. This setup consists of DOOM running on a Linux computer that is generating the teletext stream. The stream is then transmitted to a Raspberry Pi for encoding to its composite video output. What happened to teletext? Well, the World Wide Web took over some of the teletext function starting from the late 1990s, and the rest is history. More information here.


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Playing DOOM Teletext Old TV

Using a real TV for displaying the teletext page is great, but bear in mind that many modern TVs seem to struggle when updating teletext pages. My LG TV built in 2015 cannot run more than 3(!) FPS smoothly (and losso3000 seems to have had a similar experience in his great 420-years-of-teletext project) while my FUNAI tube television handles more than 30 FPS like a champ,” said the developer.