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, making it more reliable. 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. The chip also provides time-of-day alarm, three maskable interrupts with a common interrupt output, and a programmable square wave output.
It is a [[PC compatible RTC chip]] has hardcoded daylight saving adjustment, 24-hour and is programmed in the same way12-hour format modes, binary and BCD format modes.
== Ports ==
<pre>
Number Content Values
#00 actual second 00-59 (bcd or binary)#01 alarm second 00-59 (bcd or binary)#02 actual minute 00-59 (bcd or binary)#03 alarm minute 00-59 (bcd or binary)#04 actual hour 00-23 (bcd or binary)#05 alarm hour 00-23 (bcd or binary)#06 day of the week ??01-07#07 day of the month 01-31 (bcd or binary)#08 month 01-12 (bcd or binary)#09 year 00-99 (bcd or binary)
#0A status A see below
#0B status B see below
== Software ==
The RTC of the SYMBiFACE II is supported by [[FutureOS]] and , [[SymbOS]], [[HDCPM]].
== See also ==