Agsi.SetWatchOnMemory

i want to watch the pdata page
i use the code
Agsi.SetWatchOnMemory(amPDATA,amPDATA + 0x100,MemoryReadWatch,AGSIREAD);

it no effect..
so i change

Agsi.SetWatchOnMemory(amPDATA << 16,amPDATA << 16 + 0x100,MemoryReadWatch,AGSIREAD);

it no effect too..

how to use the function can i get the amPDATA real address to watch...

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