How did old video players, game consoles, etc. know what scanline the CRT was on? Did TVs adjust themselves based on the signal they received?
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There is a signal know as the horizontal blanking signal, it told the input when it was at the bottom of the screen and when to start from the top again, as the time between top and bottom was a fixed amount it only takes some basic maths to work out where the electron beam is on at any given point.
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