diff --git a/Components/6522/6522.hpp b/Components/6522/6522.hpp
index df8502f71..733fccd75 100644
--- a/Components/6522/6522.hpp
+++ b/Components/6522/6522.hpp
@@ -68,7 +68,7 @@ class IRQDelegatePortHandler: public PortHandler {
 		/// Sets the delegate that will receive notification of changes in the interrupt line.
 		void set_interrupt_delegate(Delegate *delegate);
 
-		/// Overrides PortHandler::set_interrupt_status, notifying the delegate if one is set.
+		/// Overrides @c PortHandler::set_interrupt_status, notifying the delegate if one is set.
 		void set_interrupt_status(bool new_status);
 
 	private:
diff --git a/Machines/Apple/AppleII/AppleII.cpp b/Machines/Apple/AppleII/AppleII.cpp
index a1d9aecdc..f2bc2e0ac 100644
--- a/Machines/Apple/AppleII/AppleII.cpp
+++ b/Machines/Apple/AppleII/AppleII.cpp
@@ -256,6 +256,20 @@ template <Analyser::Static::AppleII::Target::Model model, bool has_mockingboard>
 			pick_card_messaging_group(card);
 		}
 
+		void card_did_change_interrupt_flags(Apple::II::Card *) final {
+			bool nmi = false;
+			bool irq = false;
+
+			for(const auto &card: cards_) {
+				if(card) {
+					nmi |= card->nmi();
+					irq |= card->irq();
+				}
+			}
+			m6502_.set_nmi_line(nmi);
+			m6502_.set_irq_line(irq);
+		}
+
 		Apple::II::Mockingboard *mockingboard() {
 			return dynamic_cast<Apple::II::Mockingboard *>(cards_[MockingboardSlot - 1].get());
 		}
diff --git a/Machines/Apple/AppleII/Card.hpp b/Machines/Apple/AppleII/Card.hpp
index a5b6f0afa..54d43cd0c 100644
--- a/Machines/Apple/AppleII/Card.hpp
+++ b/Machines/Apple/AppleII/Card.hpp
@@ -54,7 +54,7 @@ class Card {
 
 			This is posted only to cards that announced a select constraint. Cards with
 			no constraints, that want to be informed of every machine cycle, will receive
-			a call to perform_bus_operation every cycle and should use that for time keeping.
+			a call to @c perform_bus_operation every cycle and should use that for time keeping.
 		*/
 		virtual void run_for([[maybe_unused]] Cycles cycles, [[maybe_unused]] int stretches) {}
 
@@ -93,8 +93,15 @@ class Card {
 		/*! Cards may supply a target for activity observation if desired. */
 		virtual void set_activity_observer([[maybe_unused]] Activity::Observer *observer) {}
 
+		/// @returns The current semantic NMI line output of this card.
+		virtual bool nmi() { return false; }
+
+		/// @returns The current semantic IRQ line output of this card.
+		virtual bool irq() { return false; }
+
 		struct Delegate {
 			virtual void card_did_change_select_constraints(Card *card) = 0;
+			virtual void card_did_change_interrupt_flags(Card *card) = 0;
 		};
 		void set_delegate(Delegate *delegate) {
 			delegate_ = delegate;
diff --git a/Machines/Apple/AppleII/Mockingboard.hpp b/Machines/Apple/AppleII/Mockingboard.hpp
index dbde129e5..b56ebecc5 100644
--- a/Machines/Apple/AppleII/Mockingboard.hpp
+++ b/Machines/Apple/AppleII/Mockingboard.hpp
@@ -18,7 +18,10 @@ namespace Apple::II {
 class Mockingboard: public Card {
 	public:
 		Mockingboard() :
-			vias_{ {handlers_[0]}, {handlers_[1]} } {}
+			vias_{ {handlers_[0]}, {handlers_[1]} } {
+			set_select_constraints(0);
+			handlers_[0].card = handlers_[1].card = this;
+		}
 
 		void perform_bus_operation(Select select, bool is_read, uint16_t address, uint8_t *value) final {
 			if(!(select & Device)) {
@@ -33,8 +36,32 @@ class Mockingboard: public Card {
 			}
 		}
 
+		void run_for(Cycles cycles, int) final {
+			vias_[0].run_for(cycles);
+			vias_[1].run_for(cycles);
+		}
+
+		bool nmi() final {
+			return handlers_[1].interrupt;
+		}
+
+		bool irq() final {
+			return handlers_[0].interrupt;
+		}
+
+		void did_change_interrupt_flags() {
+			delegate_->card_did_change_interrupt_flags(this);
+		}
+
 	private:
-		class AYVIA: public MOS::MOS6522::IRQDelegatePortHandler {
+		struct AYVIA: public MOS::MOS6522::PortHandler {
+			void set_interrupt_status(bool status) {
+				interrupt = status;
+				card->did_change_interrupt_flags();
+			}
+
+			bool interrupt;
+			Mockingboard *card = nullptr;
 		};
 
 		MOS::MOS6522::MOS6522<AYVIA> vias_[2];