Switch meaning of bit 2.

Components/AY38910/AY38910.cpp

@@ -376,6 +376,17 @@ void AY38910SampleSource<is_stereo>::set_control_lines(ControlLines control_line
 	update_bus();
 }
 
+template <bool is_stereo>
+void AY38910SampleSource<is_stereo>::set_reset(bool active) {
+	if(active == reset_) return;
+	reset_ = active;
+
+	// Reset upon the leading edge; TODO: is this right?
+	if(reset_) {
+		reset();
+	}
+}
+
 template <bool is_stereo>
 void AY38910SampleSource<is_stereo>::reset() {
 	// TODO: the below is a guess. Look up real answers.

Components/AY38910/AY38910.hpp

@@ -84,6 +84,9 @@ template <bool stereo> class AY38910SampleSource {
 		/// Strobes the reset line.
 		void reset();
 
+		/// Sets the current value of the reset line.
+		void set_reset(bool reset);
+
 		/*!
 			Gets the value that would appear on the requested interface port if it were in output mode.
 			@parameter port_b @c true to get the value for Port B, @c false to get the value for Port A.
@@ -118,6 +121,8 @@ template <bool stereo> class AY38910SampleSource {
 	private:
 		Concurrency::AsyncTaskQueue<false> &task_queue_;
 
+		bool reset_ = false;
+
 		int selected_register_ = 0;
 		uint8_t registers_[16]{};
 		uint8_t output_registers_[16]{};

Machines/Apple/AppleII/Mockingboard.hpp

@@ -103,13 +103,11 @@ class Mockingboard: public Card {
 						ControlLines(
 							((value & 1) ? ControlLines::BC1 : 0) |
 							((value & 2) ? ControlLines::BDIR : 0) |
-							((value & 4) ? ControlLines::BC2 : 0)
+							ControlLines::BC2
 						)
 					);
 
-					if(!value) {
+					ay.set_reset(!(value & 4));
-						ay.reset();
-					}
 				} else {
 					ay.set_data_input(value);
 				}