What is turbo mode2/2/2023 Some systems also supported keyboard combinations Ctrl- Alt- + and Ctrl- Alt- for switching turbo mode on and off ITT Xtra used Ctrl- Alt- ? to toggle. On some systems the turbo button was linked to a turbo LED or two-digit segmented display on the system case, although in almost all cases, the indicated frequency (in MHz) wasn't a measure of the actual processor clocks, but the two "fast" and "slow" display options set by jumpers on the motherboard (or a daughterboard linked to the button), or on some later machines, set in the BIOS software. 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. Engaging 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.
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