I liked to flip the button around and have turbo on = faster, turbo off = slower.

Site blocks Tor.

On some old XT clones the turbo button did nothing, but Ctrl+Alt+Num- did the trick :D

Or the button sped it up.

The female connector on the button was directionless; motherboards provide a two pin header, and the typical local PC builder would hook it up arbitrarily based on what they thought was correct or what was easier in the assembly.