Sergey Kiselev and Aitor Gómez García have developed the RTC8088, a compact real-time clock add-on board for IBM PC/XT and compatible computers. The board features a Dallas DS12885 real-time clock module and coin cell battery holder for power-off operation. A DIP switch allows for easy I/O address configuration, making it compatible with various systems. The board is available for purchase as a PCB, parts kit, or fully assembled unit, with design files and source code accessible on GitHub under open hardware licenses.
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https://www.hackster.io/news/the-open-hardware-rtc8088-adds-a-battery-backed-real-time-clock-to-any-ibm-pc-xt-or-compatible-d31740423c75.amp