Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80.

Machines/Atari2600/Cartridges/Cartridge.hpp

@@ -161,7 +161,7 @@ template<class T> class Cartridge:
 			return cycles_run_for / 3;
 		}
 
-		void synchronise() {
+		void flush() {
 			update_audio();
 			update_video();
 			speaker_->flush();

Machines/Commodore/Vic-20/Vic20.hpp

@@ -169,7 +169,7 @@ class Machine:
 
 		// to satisfy CPU::MOS6502::Processor
 		unsigned int perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value);
-		void synchronise() { mos6560_->synchronise(); }
+		void flush() { mos6560_->flush(); }
 
 		// to satisfy CRTMachine::Machine
 		virtual void setup_output(float aspect_ratio);

Machines/Electron/Electron.cpp

@@ -343,7 +343,7 @@ unsigned int Machine::perform_bus_operation(CPU::MOS6502::BusOperation operation
 	return cycles;
 }
 
-void Machine::synchronise() {
+void Machine::flush() {
 	update_display();
 	update_audio();
 	speaker_->flush();

Machines/Electron/Electron.hpp

@@ -89,7 +89,7 @@ class Machine:
 
 		// to satisfy CPU::MOS6502::Processor
 		unsigned int perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value);
-		void synchronise();
+		void flush();
 
 		// to satisfy CRTMachine::Machine
 		virtual void setup_output(float aspect_ratio);

Machines/Oric/Oric.cpp

@@ -136,9 +136,9 @@ unsigned int Machine::perform_bus_operation(CPU::MOS6502::BusOperation operation
 	return 1;
 }
 
-void Machine::synchronise() {
+void Machine::flush() {
 	update_video();
-	via_.synchronise();
+	via_.flush();
 }
 
 void Machine::update_video() {
@@ -234,7 +234,7 @@ uint8_t Machine::VIA::get_port_input(Port port) {
 	}
 }
 
-void Machine::VIA::synchronise() {
+void Machine::VIA::flush() {
 	ay8910->run_for_cycles(cycles_since_ay_update_);
 	ay8910->flush();
 	cycles_since_ay_update_ = 0;

Machines/Oric/Oric.hpp

@@ -80,7 +80,7 @@ class Machine:
 
 		// to satisfy CPU::MOS6502::Processor
 		unsigned int perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value);
-		void synchronise();
+		void flush();
 
 		// to satisfy CRTMachine::Machine
 		virtual void setup_output(float aspect_ratio);
@@ -151,7 +151,7 @@ class Machine:
 				std::unique_ptr<TapePlayer> tape;
 				std::shared_ptr<Keyboard> keyboard;
 
-				void synchronise();
+				void flush();
 
 			private:
 				void update_ay();