The LED display showing the CPU clock frequency, in MHz, of an Intel 80486 based computer. The turbo button is the right small button, whereas the left small button is the reset button which still exists in computers as of 2017; the triangular button is the power button.
On personal computers, the turbo button is a button which provides two run states for the computer: normal speed or a “turbo” speed. It was relatively common on personal computers using the Intel 80286, Intel 80386 and Intel 80486 processors, from the mid 1980s to mid 1990s.
The name is inspired by turbocharger, a turbine-driven forced induction device that increases an engine’s power and efficiency.
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