English name of the RTC Real-Time Clock, translated real-time clock chip RTC crystal and associated circuitry on the PC motherboard clock circuit to generate a pulse, the RTC after the 8254 circuit of variable frequency to produce a lower frequency of the OS(system) clock TSC, the system clock a cpu cycle plus one, each time the system clock in the system since the beginning of initialization through the RTC. The 8254 work also need to have their own drive clock (the PIT).

rtc.c

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