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. It was relatively common on computers using the Intel 80286, [1] 80386 and 80486 …

Apr 11, 2013 · In 486 is is possible that you can enable/disable the cache with software and from the keyboard and call this "turbo". But this might be irrelevant to the "turbo" button some cases have. Even if your case has no such button, the switch might exist on the mainboard.

May 21, 2019 · 386 and some early 486 board had still a Turbo button that slowed down the CPU speed. I had a Vobis 386 computer that had an 8 MHz/25 MHz 386. From what I recall in the manual was explained that was for reading copy protected floppies or software that didn't work at the higher speed.

If you think about it, "Turbo mode" was the slow mode. From the factory it came at a default of 80Mhz. That's the advertised product. Pressing the Turbo button slows it down, essentially making it Turbo mode.

May 9, 2023 · The numbers on the LED display are arbitrary. You can set the jumpers to make it say whatever you want. On most 486 and later systems, disengaging turbo mode doesn't actually slow down the CPU's clock speed. Instead, it disables the cache and adds wait states.

May 21, 2023 · When I set it to Turbo Key, the sleep behavior stops when I push the turbo button. However, the turbo LED stays on no matter what. Not sure if it's readable, but I attached a pic of the pin descriptions on the board.

Feb 4, 2023 · 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. It was relatively common on computers using the Intel 80286, Intel 80386 and Intel 80486 processors, from the mid 1980s to mid 1990s.

Feb 7, 2023 · Previously i used Intel 486SX-25 on this motherboard and when i turned off the turbo (from the button) the speed dropped more than 2 times. Now with 486DX2-66 Write Back CPU the difference between turbo and non-turbo mode is very small (144 vs 143.8 on SysInfo).

Jun 1, 2011 · Most 486 motherboards, at least the OEM/sysem builder boards, support a turbo button. As I have read, the turbo can do one of three things to slow down the machine: 1. Cut the processor speed to 8Mhz. 2. Insert wait states to simulate 8MHz speed. 3. Turn off the cache.

Aug 28, 2006 · The Turbo button had a sole function of toggling the max speed of the cpu to the at standard speed of 8Mhz. If you had a 486 with a turbo button it would toggle from 25, 33, 66, whatever down...