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SYMBiFACE II uses a Dallas DS12887A RTC chip. [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/real-time-clock-board/msg249380/#msg249380 Source]
This chip is a modernized version of the MC146818, the original RTC chip used in the IBM PC/AT. It includes a built-in battery and crystal. It is a [[PC compatible RTC chip]] and is programmed in the same way.
It has 14 bytes of registers and 114 bytes of battery-backed static RAM. Century register doesn't exist on this particular model. It is a [[PC compatible RTC The chip]] also provides time-of-day alarm, three maskable interrupts with a common interrupt output, and is programmed in the same waya programmable square wave output.
== Ports ==
