As far as I remember, the button itself was supposed to let the computers run at their normal, faster, speed. Meaning the computer was supposed to be in Turbo m

As far as I remember, the button itself was supposed to let the computers run at their normal, faster, speed. Meaning the computer was supposed to be in Turbo mode, all the time. You turned the Turbo mode off when you needed to run it slower, say for playing games. So, technically the button did what it said, run faster in Turbo mode.