Anyone who grew up in the CRT era of TVs remembers that you had to turn the channel to 3 before you turned on the VCR or game console. Otherwise, the picture would not work. Why was this so necessary?
Edit: woah this blew up while I wasn’t looking! Thanks for the replies!
In: Technology
You would have your normal cable line that had all the channels on it. You would plug this into your VCR. You plug another cable from your VCR into your TV.
When your VCR was idle, it would just forward the signal from its line in onto its line out. However, when your VCR was on, it would interrupt the signal for one channel and put its own signal on that channel instead.
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