LOL, the turbo button when the front of the PC displayed the number of MHz the computer was operating at, and you could slow it down so you could play old games. Good times.
Interesting bit of trivia: the MHz LED display on the front of most PC cases was typically configured by jumpers and wired directly to the turbo button; it did not read the actual speed from the motherboard. So if you wanted, you could make it say "HI" for high speed and "LO" for low speed.
Yep, I remember spending an afternoon reverse-engineering the jumper configuration to change the numbers to match the CPU I had just upgraded. I may still have the diagram I drew somewhere. And I thought I didn't have enough free time back then.
As a kid I was fascinated by the fact that turbo button was actually a brake button but there was a perverse incentive to call it turbo because of the psychological effect.
