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какое отношение имеет CMOS к микросхеме rtc

Микросхема RTC обновляет время, хранящееся в CMOS.

что CMOS забыл в южном мосту

https://en.wikipedia.org/wiki/Southbridge_(computing)#Functionality

The functionality found in a contemporary southbridge includes:
...
Nonvolatile BIOS memory. The system CMOS (BIOS configuration memory), assisted by battery supplemental power, creates a limited non-volatile storage area for system configuration data.

https://en.wikipedia.org/wiki/Nonvolatile_BIOS_memory

The CMOS RAM and the real-time clock have been integrated as a part of the southbridge chipset and it may not be a standalone chip on modern motherboards.

какое отношение имеет CMOS к микросхеме rtc

Микросхема RTC обновляет время, хранящееся в CMOS.

что CMOS забыл в южном мосту

https://en.wikipedia.org/wiki/Southbridge_(computing)#Functionality

The functionality found in a contemporary southbridge includes:
...
Nonvolatile BIOS memory. The system CMOS (BIOS configuration memory), assisted by battery supplemental power, creates a limited non-volatile storage area for system configuration data.

https://en.wikipedia.org/wiki/Nonvolatile_BIOS_memory

The CMOS RAM and the real-time clock have been integrated as a part of the southbridge chipset and it may not be a standalone chip on modern motherboards. In turn, the southbridge have been integrated into a single Platform Controller Hub.