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Virtual Workshop Interface->General Purpose Interface Calls->SetDataWord
extern "C" LONG SetDataWord(LONG nExtensionState, LONG nAddress, WORD nValue, LONG nSimulating)
The extension should return 0 if it does not want to handle this call. Otherwise it should return 1, use nValue as the new 16-bit value associated with memory address nAddress and carry out any other operations associated with a write to this address (such as a memory mapped activity).