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  2. Real-time clock - Wikipedia

    en.wikipedia.org/wiki/Real-time_clock

    Lithium battery inside the real-time clock IC RTCs often have an alternate source of power, so they can continue to keep time while the primary source of power is off or unavailable. This alternate source of power is normally a lithium battery in older systems, but some newer systems use a supercapacitor , [ 4 ] [ 5 ] because they are ...

  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. 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 ...

  5. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threa­ded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.

  6. Backup battery - Wikipedia

    en.wikipedia.org/wiki/Backup_battery

    CR2032 battery used as backup battery on a notebook motherboard. Modern personal computer motherboards have a backup battery to run the real-time clock circuit and retain configuration memory while the system is turned off. [1] This is often called the CMOS battery or BIOS battery.

  7. 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 ...

  8. TI MSP430 - Wikipedia

    en.wikipedia.org/wiki/TI_MSP430

    Real-Time Clock; RTC_A/B are 32-bit hardware counter modules that provide clock counters with a calendar, a flexible programmable alarm, and calibration. The RTC_B includes a switchable battery backup system that provides the ability for the RTC to operate when the primary supply fails. 16-bit timers

  9. 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.)

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