Addr support for the RTS/CTS and IRQ pins to the MC6850 chip emulation

Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>

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();
 

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;