this post was submitted on 29 Mar 2025
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That reminds me. They did used to broadcast software over teletext over TV https://teletext.mb21.co.uk/gallery/ceefax/telesoftware/
There was also a system where some TV screen pixels were used to send data, but I'm struggling to remember how you were supposed to get it into the computer.
I suspect that you needed to build some light sensor with a serial cable, that you held to the screen, but I'm not sure.
This was in the Netherlands, not sure if it was done elsewhere.