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That tells you the vertical frequency of the currently active screen mode (and only so if this is a native screen mode), but not the system clock frequency. To check for PALN/NTSC, please read the graphics/gfxbase.h include file, there is a flag for it. One is dynamic and changes with the active monitor, but for the system clock frequency, there is a flag named something like REALLYPAL that corresponds to the installed crystal.
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