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The Unsung Hero: CMOS Battery & Timekeeping

Delving into the intricacies of a computer’s motherboard reveals numerous essential components, often working silently behind the scenes.

The CMOS battery, a small coin-cell on your motherboard (as pictured), is crucial for maintaining vital BIOS settings (boot order, hardware config) even when your PC is off.

The CMOS (Complementary Metal-Oxide Semiconductor) battery serves as the power source for a small memory chip that stores the BIOS (Basic Input/Output System) settings.

It powers a memory chip storing these configurations, preventing the need for manual setup at each boot.

Beyond BIOS, the CMOS battery also powers the Real-Time Clock (RTC), ensuring accurate date and timekeeping – essential for file timestamps and system logs.

A dead battery often leads to incorrect system time. Replacement is usually straightforward with a standard CR2032 battery. Some modern systems still rely on this simple yet effective solution.

For accurate time synchronization over networks, the Network Time Protocol (NTP) is used, typically communicating over UDP port 123.

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