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