You are five by nine

What feature does the CMOS battery provide?

A) Maintains the BIOS configuration

B) Powers the LED status lights

C) Manages the fan cooling sensors

D) Powers the CPU cache

E) Powers the Internet transistor radio

The answer: A) Maintains the BIOS configuration

The configuration settings from the BIOS are saved in memory that must constantly be powered to maintain the settings. If the computer is disconnected from main power, the startup configuration of the device will be maintained by using this small battery.

Want to know more? Watch “BIOS and CMOS.”

We rely on the BIOS to test our computer and start our operating systems, but what is really happening under the surface? In this module, you’ll learn about the BIOS works and we’ll demonstrate the basics of starting and configuring BIOS settings.