Ensured propagation of synchronise messages, added enough to do plain tone. Probably. So: noise and envelopes missing. And it's all far too quiet.

Components/AY38910/AY38910.cpp

@@ -10,8 +10,9 @@
 
 using namespace GI;
 
-AY38910::AY38910() : _selected_register(0)
+AY38910::AY38910() : _selected_register(0), _channel_ouput{0, 0, 0}
 {
+	_output_registers[8] = _output_registers[9] = _output_registers[10] = 0;
 }
 
 void AY38910::set_clock_rate(double clock_rate)
@@ -19,17 +20,39 @@ void AY38910::set_clock_rate(double clock_rate)
 	set_input_rate((float)clock_rate);
 }
 
+#define step(c)	\
+	_channel_dividers[c] -= resulting_steps;	\
+	if(!_channel_dividers[c])	\
+	{	\
+		_channel_dividers[c] = (int)_tone_generator_controls[c] + 1;	\
+		_channel_ouput[c] ^= 1;	\
+	}
+
 void AY38910::get_samples(unsigned int number_of_samples, int16_t *target)
 {
-	printf("%d\n", number_of_samples);
 	for(int c = 0; c < number_of_samples; c++)
 	{
-		*target++ = (c & 64) * 64;
+		// a master divider divides the clock by 16
+		int former_master_divider = _master_divider;
+		_master_divider++;
+		int resulting_steps = ((_master_divider ^ former_master_divider) >> 4) & 1;
+
+		// from that the three channels count down
+		step(0);
+		step(1);
+		step(2);
+
+		*target++ = (int16_t)((
+			((_output_registers[8]&0xf) * _channel_ouput[0]) +
+			((_output_registers[9]&0xf) * _channel_ouput[1]) +
+			((_output_registers[10]&0xf) * _channel_ouput[2])
+		) * 512);
 	}
 }
 
 void AY38910::skip_samples(unsigned int number_of_samples)
 {
+	// TODO
 }
 
 void AY38910::select_register(uint8_t r)

Components/AY38910/AY38910.hpp

@@ -33,6 +33,10 @@ class AY38910: public ::Outputs::Filter<AY38910> {
 
 		uint16_t _tone_generator_controls[3];
 		uint16_t _envelope_period;
+
+		int _master_divider;
+		int _channel_dividers[3];
+		int _channel_ouput[3];
 };
 
 };

Machines/Oric/Oric.cpp

@@ -61,6 +61,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
 void Machine::synchronise()
 {
 	update_video();
+	_via.synchronise();
 }
 
 void Machine::update_video()

Machines/Oric/Oric.hpp

@@ -138,6 +138,8 @@ class Machine:
 				std::shared_ptr<GI::AY38910> ay8910;
 				std::shared_ptr<Keyboard> keyboard;
 
+				inline void synchronise() { update_ay(); }
+
 			private:
 				void update_ay()
 				{