Copy RTC.SYS to the SYS folder, and DATE to the BIN folder of the SD card.
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Read more: https://mumio.dev/?p=135

esxDOS is a file operating system, installed on storage devices: divIDE/divMMC (SD/MMC cards), divIDE (IDE
disks), Just NANO SD (SD cards).

The RTC.SYS driver located in the SYS folder is responsible for communication with the MUMIO #02 RTC device.

For support from the ZX Spectrum esxDOS command line, the .date command corresponds to the DATE file, which should be
replaced in the BIN folder. 

ZX Spectrum MUMIO devices
https://mumio.dev

