Changes
SYMBiFACE II uses a Dallas DS12887A RTC chip. [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/real-time-clock-board/msg249380/#msg249380 Source]
According to the datasheet, this has 14 bytes of registers and 114 bytes of battery-backed static RAM. It's ram inside the device. Century register doesn't exist on this particular model.
Both are [[PC compatible RTC chip]] and are programmed in the same way.