System Clock

The system clock, as accessed by OS_Word 1 and 2, is no longer a pair of incrementing timers. Because of this, the 'timer switch' state (OS_Byte 243) is no longer used and will return a constant value.

The system clock is not related to the interval timer (OS_Word 3,4), nor to the monotonic time (OS_ReadMonotonicTime) except that all are triggered at 100Hz.

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