FD14h SYMBiFACE II Real Time Clock - DS12887A RTC Data (R/W)
FD15h SYMBiFACE II Real Time Clock - DS12887A RTC Index (W)
Century is not supported.
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Uses a HD146818 chip.
Details on I/O addresses are unknown.
Unknown if century is supported.
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In the Aleste's Ext Port, the RTC must be enabled, and PSG and
8253 must be disabled.
Unknown if century is supported.
=== RTC Registers ===