![]() The turbo display is used to display the current frequency (MHz) speed of the CPU, this is usually done by a two or three-digit digital LED display. Unlike the turbo button that was common on computer cases, the turbo button on the keyboards did not control the clock rate of the CPU rather, it controlled the keyboard repeat rate. Some keyboards had a turbo button as well, located near right Shift. 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). 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. 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. Disengaging turbo mode slows the system down to a state compatible with original 8086/ 8088 chips. To restore compatibility, the "turbo" button was added. Games in particular were often rendered unplayable, due to the reduced time allowed to react to the faster game events. 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. ( March 2023) ( Learn how and when to remove this template message) ![]() Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources.
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