My (arnoldemu's) symbiface 2 uses a Dallas DS12887A. Documents claim this has 128 bytes RAM. Century register doesn't exist. It's ram inside the device.
The picture from the Symbos website shows a DS1287A. This has 50 bytes RAM. Century register doesn't exist.
The card uses a Dallas DS1287A, which is a Both are [[PC compatible RTC chip]] with 50 bytes and are programmed in the same way. Therefore do not rely on a specific amount of RAMinside the RTC chip.
== Ports ==