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  2. Apple II system clocks - Wikipedia

    en.wikipedia.org/wiki/Apple_II_system_clocks

    The card was capable of a 12‑ and 24‑hour clock format, was both ProDOS and DOS 3.3 compatible, and had on-screen time and date setting built into its ROM, eliminating the need to run a program in order to set the time. The battery was a GE DataSentry rechargeable Ni-cad battery which had a lifespan rating of 20 years. The card retailed for ...

  3. Nonvolatile BIOS memory - Wikipedia

    en.wikipedia.org/wiki/Nonvolatile_BIOS_memory

    The memory battery (aka motherboard, CMOS, real-time clock (RTC), clock battery) [2] [10] is generally a CR2032 lithium coin cell.This cell battery has an estimated life of three years when power supply unit (PSU) is unplugged or when the PSU power switch is turned off. [11]

  4. Microelectromechanical system oscillator - Wikipedia

    en.wikipedia.org/wiki/Microelectromechanical...

    MEMS Real-time clocks (RTCs) are ICs that track time of day and date. They include MEMS resonators, sustaining amps, and registers that increment with time, for instance counting days, hours, minutes and seconds. They also include auxiliary functions like alarm outputs and battery management. RTCs must run continuously to keep track of elapsed ...

  5. Category:Computer real-time clocks - Wikipedia

    en.wikipedia.org/wiki/Category:Computer_real...

    Real-time clocks are electronic devices designed to provide system time, and thereby wall-clock time, to a computer system. (Contrast this with clock signals, designed to provide timing for electronics themselves.)

  6. Real-time clock - Wikipedia

    en.wikipedia.org/wiki/Real-time_clock

    A real-time clock (RTC) is an electronic device (most often in the form of an integrated circuit) that measures the passage of time. Although the term often refers to the devices in personal computers , servers and embedded systems , RTCs are present in almost any electronic device which needs to keep accurate time of day .

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  8. Backup battery - Wikipedia

    en.wikipedia.org/wiki/Backup_battery

    This is often called the CMOS battery or BIOS battery. The original IBM AT through to the PS/2 range, used a relatively large primary lithium battery, compared to later models, to retain the clock and configuration memory. [2] These early machines required the backup battery to be replaced periodically due to the relatively large power consumption.

  9. Clock synchronization - Wikipedia

    en.wikipedia.org/wiki/Clock_synchronization

    Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates. There are several problems that occur as a result of ...