diff --git a/Machines/Atari2600/Atari2600.cpp b/Machines/Atari2600/Atari2600.cpp
index 2650539b3..803370799 100644
--- a/Machines/Atari2600/Atari2600.cpp
+++ b/Machines/Atari2600/Atari2600.cpp
@@ -34,13 +34,12 @@ void Machine::setup_output(float aspect_ratio)
 	_crt->set_composite_sampling_function(
 		"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)\n"
 		"{\n"
-			"return 0.9;"
-//			"vec2 c = vec2(1.0);"//vec2(texture(texID, coordinate).rg) / vec2(255.0);"
-//			"float y = 0.1 + c.x * 0.91071428571429;\n"
-//			"float aOffset = 6.283185308 * (c.y - 3.0 / 16.0) * 1.14285714285714;\n"
-//			"return y + step(0.03125, c.y) * 0.1 * cos((coordinate.x * 2.0 * 3.141592654) - aOffset);\n"
+			"vec2 c = vec2(texture(texID, coordinate).rg) / vec2(255.0);"
+			"float y = 0.1 + c.x * 0.91071428571429;\n"
+			"float aOffset = 6.283185308 * (c.y - 3.0 / 16.0) * 1.14285714285714;\n"
+			"return y + step(0.03125, c.y) * 0.1 * cos(phase - aOffset);\n"
 		"}");
-	_crt->set_output_device(Outputs::CRT::Monitor);
+	_crt->set_output_device(Outputs::CRT::Television);
 }
 
 Machine::~Machine()