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A very long time in the past, private computer systems used to have a Turbo button alongside Power and Reset. Oftentimes laptop circumstances additionally had a small LED show displaying the CPU’s clock frequency in MHz or displaying “HI” or “LO” to point the mode the CPU was operating at.
This passed off after the discharge of the unique Intel 8086 processor that operated at 4.77 MHz. At the time, many software program titles (and specifically video games) had been developed with a particular machine in thoughts and had been tied to the particular clock frequency of the CPU to perform.
When quicker processors got here out, the software program ran too quick, so the “Turbo” button was launched to decelerate the PC as a compatibility layer so these applications might run usually. Some computer systems supported keyboard combos Ctrl-Alt-+ / Ctrl-Alt– for switching turbo mode on and off.
The “Turbo” button was quite common in 286 and 386 PC clones, much less frequent in 486 PCs and virtually extinct by the point Pentium processors went mainstream within the late 90s.