diff --git a/MC6809/test/Board.cpp b/MC6809/test/Board.cpp
index 37d5337..686df01 100644
--- a/MC6809/test/Board.cpp
+++ b/MC6809/test/Board.cpp
@@ -26,6 +26,7 @@ void Board::initialise() {
 	ADDRESS() = 0b1010000000000000;
 	ACIA().DATA() = EightBit::mc6850::CR0 | EightBit::mc6850::CR1;	// Master reset
 	updateAciaPins(EightBit::Chip::PinLevel::Low);
+	ACIA().lower(ACIA().CTS());
 	ACIA().powerOn();
 	ACIA().access();
 
diff --git a/MC6850/inc/MC6850.h b/MC6850/inc/MC6850.h
index 7c99d71..51c5796 100644
--- a/MC6850/inc/MC6850.h
+++ b/MC6850/inc/MC6850.h
@@ -268,6 +268,10 @@ namespace EightBit {
 		void startTransmit();
 		void completeReceive();
 
+		bool isInterruptRequired() const;
+		bool isTransmitInterruptRequired() const;
+		bool isReceiveInterruptRequired() const;
+
 		PinLevel m_RXDATA;
 		PinLevel m_TXDATA;
 
diff --git a/MC6850/src/MC6850.cpp b/MC6850/src/MC6850.cpp
index 849548f..bf7695a 100644
Binary files a/MC6850/src/MC6850.cpp and b/MC6850/src/MC6850.cpp differ