My 386sx/25MHz also had a turbo button. It was rather useless, as I wanted the machine to go faster, not slower...
Here's another turbo-nostalgia memory from further back:
The Commodore C64 tape drive had a small hole which let you adjust the tape head azimuth to get a better signal. Sometimes, after borrowing tapes with games from a friend, one had to do adjustments as the turbo loader did not load the game correctly.
Hence the adjustment screw was called "the turbo screw".
Here's another turbo-nostalgia memory from further back:
The Commodore C64 tape drive had a small hole which let you adjust the tape head azimuth to get a better signal. Sometimes, after borrowing tapes with games from a friend, one had to do adjustments as the turbo loader did not load the game correctly.
Hence the adjustment screw was called "the turbo screw".