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The 970 does not implement a alternate timebase. So for 970 the timebaseNote that some CPUs like the 970 can have an externally clocked timebase. Apple uses this feature to make the CPU immune to bus/cpu frequency slewing, they use a 33Mhz clock for that.
is the highest frequency counter available.
It seems that Apple choose 33MHz to meet the minimum (slowest)CPU- clock
/
32 timebase. But that was their choice. The IBM hardware seems to be
holding to the CPU_clock / 8 timebase (including 970 based JS20).
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