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Some weren’t connected? For most PCs that had it, it was a real thing, though counterintuitive and marketing-speak, because enabling “turbo” was just normal speed and disabling would run in a slower mode for compatibility.
https://en.wikipedia.org/wiki/Turbo_button
After the 486, there were pentiums built at shops that still used 486 cases. In my experience the button wasn’t plugged in.