diff --git a/Outputs/CRT.cpp b/Outputs/CRT.cpp
index 854dbb101..23adb2604 100644
--- a/Outputs/CRT.cpp
+++ b/Outputs/CRT.cpp
@@ -12,19 +12,22 @@ using namespace Outputs;
 
 CRT::CRT(int cycles_per_line)
 {
+	_horizontalOffset = 0.0f;
+	_verticalOffset = 0.0f;
 }
 
 void CRT::output_sync(int number_of_cycles)
 {
-	printf("[%d]\n", number_of_cycles);
+	// horizontal sync is edge triggered; vertical is integrated
+	_syncCapacitorChargeLevel += number_of_cycles;
 }
 
 void CRT::output_level(int number_of_cycles, uint8_t *level, std::string type)
 {
-	printf("[---:%d]", number_of_cycles);
+	_syncCapacitorChargeLevel -= number_of_cycles;
 }
 
 void CRT::output_data(int number_of_cycles, uint8_t *data, std::string type)
 {
-	printf("[+++:%d]", number_of_cycles);
+	_syncCapacitorChargeLevel -= number_of_cycles;
 }
diff --git a/Outputs/CRT.hpp b/Outputs/CRT.hpp
index 45be6488b..c895e51a7 100644
--- a/Outputs/CRT.hpp
+++ b/Outputs/CRT.hpp
@@ -20,6 +20,30 @@ class CRT {
 		void output_sync(int number_of_cycles);
 		void output_level(int number_of_cycles, uint8_t *level, std::string type);
 		void output_data(int number_of_cycles, uint8_t *data, std::string type);
+
+		struct CRTRun {
+			struct Point {
+				float x, y;
+			} start_point, end_point;
+
+			enum Type {
+				Sync, Level, Data
+			} type;
+
+			uint8_t *data;
+		};
+
+		class CRTDelegate {
+			public:
+				void crt_did_start_vertical_retrace_with_runs(CRTRun *runs, int number_of_runs);
+		};
+		void set_crt_delegate(CRTDelegate *);
+
+	private:
+		CRTDelegate *_delegate;
+
+		int _syncCapacitorChargeLevel;
+		float _horizontalOffset, _verticalOffset;
 };
 
 }