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The Extension Interface->Variant Specific Interface Calls->SetSFRMemory()
extern "C" LONG SetSFRMemory(LONG nExtensionState, int nAddress, BYTE nValue, LONG nSimulating)
The extension should return zero if it does not want to handle this call. Otherwise it should return one, use nValue as the new value associated with sfr address nAddress and carry out any other operations associated with a write to this address (such as an sfr operation associated with an 8051 variant).