Removed state mirroring in the machine-specific Mac UI classes.

Machines/Atari2600/Atari2600.cpp

@@ -130,6 +130,18 @@ class ConcreteMachine:
 			}
 		}
 
+		bool get_switch_is_enabled(Atari2600Switch input) override {
+			uint8_t port_input = bus_->mos6532_.get_port_input(1);
+			switch(input) {
+				case Atari2600SwitchReset:					return !!(port_input & 0x01);
+				case Atari2600SwitchSelect:					return !!(port_input & 0x02);
+				case Atari2600SwitchColour:					return !!(port_input & 0x08);
+				case Atari2600SwitchLeftPlayerDifficulty:	return !!(port_input & 0x40);
+				case Atari2600SwitchRightPlayerDifficulty:	return !!(port_input & 0x80);
+				default:									return false;
+			}
+		}
+
 		void set_reset_switch(bool state) override {
 			bus_->set_reset_line(state);
 		}

Machines/Atari2600/Atari2600.hpp

@@ -33,6 +33,9 @@ class Machine:
 		/// Sets the switch @c input to @c state.
 		virtual void set_switch_is_enabled(Atari2600Switch input, bool state) = 0;
 
+		/// Gets the state of switch @c input.
+		virtual bool get_switch_is_enabled(Atari2600Switch input) = 0;
+
 		// Presses or releases the reset button.
 		virtual void set_reset_switch(bool state) = 0;
 };

Machines/ZX8081/ZX8081.cpp

@@ -341,10 +341,15 @@ template<bool is_zx81> class ConcreteMachine:
 				tape_player_.set_motor_control(false);
 			}
 		}
+
 		void set_tape_is_playing(bool is_playing) override final {
 			tape_player_.set_motor_control(is_playing);
 		}
 
+		bool get_tape_is_playing() override final {
+			return tape_player_.get_motor_control();
+		}
+
 		// MARK: - Typer timing
 		HalfCycles get_typer_delay() override final { return Cycles(7000000); }
 		HalfCycles get_typer_frequency() override final { return Cycles(390000); }

Machines/ZX8081/ZX8081.hpp

@@ -30,6 +30,7 @@ class Machine:
 		static Machine *ZX8081(const Analyser::Static::Target &target_hint);
 
 		virtual void set_tape_is_playing(bool is_playing) = 0;
+		virtual bool get_tape_is_playing() = 0;
 };
 
 }

OSBindings/Mac/Clock Signal/Machine/Wrappers/CSAtari2600.mm

@@ -25,29 +25,41 @@
 }
 
 - (void)setColourButton:(BOOL)colourButton {
-	_colourButton = colourButton;
-
 	@synchronized(_machine) {
 		_atari2600->set_switch_is_enabled(Atari2600SwitchColour, colourButton);
 	}
 }
 
-- (void)setLeftPlayerDifficultyButton:(BOOL)leftPlayerDifficultyButton {
+- (BOOL)colourButton {
-	_leftPlayerDifficultyButton = leftPlayerDifficultyButton;
+	@synchronized(_machine) {
+		return _atari2600->get_switch_is_enabled(Atari2600SwitchColour);
+	}
+}
 
+- (void)setLeftPlayerDifficultyButton:(BOOL)leftPlayerDifficultyButton {
 	@synchronized(_machine) {
 		_atari2600->set_switch_is_enabled(Atari2600SwitchLeftPlayerDifficulty, leftPlayerDifficultyButton);
 	}
 }
 
-- (void)setRightPlayerDifficultyButton:(BOOL)rightPlayerDifficultyButton {
+- (BOOL)leftPlayerDifficultyButton {
-	_rightPlayerDifficultyButton = rightPlayerDifficultyButton;
+	@synchronized(_machine) {
+		return _atari2600->get_switch_is_enabled(Atari2600SwitchLeftPlayerDifficulty);
+	}
+}
 
+- (void)setRightPlayerDifficultyButton:(BOOL)rightPlayerDifficultyButton {
 	@synchronized(_machine) {
 		_atari2600->set_switch_is_enabled(Atari2600SwitchRightPlayerDifficulty, rightPlayerDifficultyButton);
 	}
 }
 
+- (BOOL)rightPlayerDifficultyButton {
+	@synchronized(_machine) {
+		return _atari2600->get_switch_is_enabled(Atari2600SwitchRightPlayerDifficulty);
+	}
+}
+
 - (void)toggleSwitch:(Atari2600Switch)toggleSwitch {
 	@synchronized(_machine) {
 		_atari2600->set_switch_is_enabled(toggleSwitch, true);

OSBindings/Mac/Clock Signal/Machine/Wrappers/CSZX8081.mm

@@ -28,9 +28,14 @@
 
 - (void)setTapeIsPlaying:(BOOL)tapeIsPlaying {
 	@synchronized(_machine) {
-		_tapeIsPlaying = tapeIsPlaying;
 		_zx8081->set_tape_is_playing(tapeIsPlaying ? true : false);
 	}
 }
 
+- (BOOL)tapeIsPlaying {
+	@synchronized(_machine) {
+		return _zx8081->get_tape_is_playing();
+	}
+}
+
 @end