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It also had a switch to make it work on channel 4 if you, for some bizarre reason, were a weirdo and needed that.
It depends where you live. In some areas, channel 3 was a TV station, and channel 4 was blank. The video game worked best when it's not competing against a TV station.
TV was on channel 3 here, and i still used channel 3 on the rf modulators lol
What if you had two consoles and needed the switch to go from one to the other?
you piggybacked one through another. whatever you turned on would interrupt the signal and output the system in question.
I totally forgot about that! I think I remember a friend doing this with a NES and SNES.
I think I had 4 RF tuners daisy chained at one point for Atari 2600, NES, SNES, and Genesis.
Two consoles wasn't really a thing back then. If you had a Nintendo you weren't really messing with anything older anymore. At least in my experience. If you wanted to switch you just changed the plugs around.
I knew some kids privileged enough to have both a SNES and a Genesis.
It wasn't impossible.
Also VCRs used the same RF switching system.
The real question was, why would you have more than one of these things on at any given time?
Weirdo here. We needed it for video games (pre-1990 at least).