Real-time clock (English Wikipedia)

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Ala-Paavola, Jaakko (2000-01-16). "Software interrupt based real time clock source code project for PIC microcontroller". Archived from the original on 2007-07-17. Retrieved 2007-08-23.

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"Real-time Clock/Complementary Metal Oxide Semiconductor (RT/CMOS) RAM Information". IBM PC AT Technical Reference (PDF). International Business Machines Corporation. 1984. p. System Board 1–45.

web.archive.org

Ala-Paavola, Jaakko (2000-01-16). "Software interrupt based real time clock source code project for PIC microcontroller". Archived from the original on 2007-07-17. Retrieved 2007-08-23.
Torres, Gabriel (24 November 2004). "Introduction and Lithium Battery". Replacing the Motherboard Battery. hardwaresecrets.com. Archived from the original on 24 December 2013. Retrieved June 20, 2013.
"Calendrical Applications". U.S. Naval Observatory. U.S. Navy. Archived from the original on 2016-04-04. Retrieved 7 November 2019.