![]() With all the 486ES models-those with and without a turbo button-the power light would show green in normal (“Turbo”) mode, and orange in Slow mode. Some systems also supported keyboard combinations Ctrl- Alt- + and Ctrl- Alt- for switching turbo mode on and off, such as the Packard Bell 486ES 3x3 (the 4x4 and MT models had a dedicated Turbo button). On most systems, turbo mode was with the button pushed in, but since the button could often be wired either way, on some systems it was the opposite.The turbo button could be linked to a turbo LED or two-digit segmented display on the system case, although in some cases, the indicated frequency (in MHz) was not a measure of the actual processor clocks, but the two "fast" and "slow" display options set by jumpers on the motherboard. Disengaging turbo mode slows the system down to a state compatible with original 8086/ 8088 chips. To provide some compatibility, the "turbo" button was added. Games in particular were often rendered unplayable. With the introduction of CPUs which ran faster than the original 4.77 MHz Intel 8088 used in the IBM Personal Computer, programs which relied on the CPU's frequency for timing were executing faster than intended. When pressed, the "turbo" button is intended to let a computer run at the highest speed for which it had been designed. The name is inspired by turbocharger, a device which increases an engine's power and efficiency. It was relatively common on computers using the Intel 80286, Intel 80386 and Intel 80486 processors, from the mid 1980s to mid 1990s. On IBM PC compatible computers, the turbo button selects one of two run states: the default "turbo" speed or a reduced speed closer to the Intel 8086 CPU. The turbo button is the small button below the segment display the amber light above is a secondary indicator of the turbo button state. The LED display showing the CPU clock frequency, in MHz, of an Intel 80486 based computer.
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