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One T9934 chip is used. The T9934 has 128 bytes of Memory. 14 of which are used for the calendar and clock. The remaining 114 bytes are used for the system configuring data.
The Real Time Clock(RTC) is backed up by the RTC Battery when the system power is off. It also contains CMOS RAM to keep the information about the system configuration set up by the SETUP or the Hotkey.