same here. i got some old computers now, and i don't know a bunch of stuff about them. just the new stuff. if thats what it does i wonder why there is even a switch. wouldn't you want it on all the time?
With the really old computers, like the 8086 and 80286 computers, game programmers would often assume that the clock speed was the same on all computers that their game would be running on. At the time, it was a good assumption, and it let them get slightly more performance out of the computer. When faster computers came along, the games would run too fast to be playable, so a number of companies added the "turbo" switch to slow things down. Turning on the "turbo" setting would make the computer run at design speed, while turning it off would underclock it.