diff --git a/Machines/Electron/Electron.cpp b/Machines/Electron/Electron.cpp
index 35dfaf718..703c505f7 100644
--- a/Machines/Electron/Electron.cpp
+++ b/Machines/Electron/Electron.cpp
@@ -82,15 +82,12 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
 		}
 		else
 		{
-			// If we're still before the display will start to be painted, or the address is
-			// less than both the current line address and 0x3000, (the minimum screen mode
-			// base address) then there's no way this write can affect the current frame. Sp
-			// no need to flush the display. Otherwise, output up until now so that any
-			// write doesn't have retroactive effect on the video output.
-//			if(!(
-//				(_fieldCycles < first_graphics_line * cycles_per_line) ||
-//				(address < _startLineAddress && address < 0x3000)
-//			))
+			if(
+				(
+					((_frameCycles >= first_graphics_line * cycles_per_line) && (_frameCycles < (first_graphics_line + 256) * cycles_per_line)) ||
+					((_frameCycles >= (first_graphics_line + field_divider_line)  * cycles_per_line) && (_frameCycles < (first_graphics_line + 256 + field_divider_line) * cycles_per_line))
+				)
+			)
 				update_display();
 
 			_ram[address] = *value;
@@ -101,7 +98,6 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
 		cycles += 1 + (_frameCycles&1);
 		if(_screen_mode < 4)
 		{
-			update_display();
 			const int current_line = graphics_line(_frameCycles + (_frameCycles&1));
 			const int current_column = graphics_column(_frameCycles + (_frameCycles&1));
 			if(current_line < 256 && current_column < 80 && !_isBlankLine)
diff --git a/Outputs/CRT/Internals/CRTConstants.hpp b/Outputs/CRT/Internals/CRTConstants.hpp
index 46d4d7209..ae9f4abc7 100644
--- a/Outputs/CRT/Internals/CRTConstants.hpp
+++ b/Outputs/CRT/Internals/CRTConstants.hpp
@@ -48,7 +48,7 @@ const GLsizeiptr InputVertexBufferDataSize = 262080;	// a multiple of 6 * Output
 // Runs are divided discretely by vertical syncs in order to put a usable bounds on the uniform used to track
 // run age; that therefore creates a discrete number of fields that are stored. This number should be the
 // number of historic fields that are required fully to 
-const int NumberOfFields = 3;
+const int NumberOfFields = 4;
 
 }
 }
diff --git a/Outputs/CRT/Internals/CRTOpenGL.cpp b/Outputs/CRT/Internals/CRTOpenGL.cpp
index c6c73a6dd..de9159273 100644
--- a/Outputs/CRT/Internals/CRTOpenGL.cpp
+++ b/Outputs/CRT/Internals/CRTOpenGL.cpp
@@ -358,7 +358,7 @@ char *OpenGLOutputBuilder::get_output_vertex_shader()
 
 			"srcCoordinatesVarying = vec2(srcCoordinates.x / textureSize.x, (srcCoordinates.y + 0.5) / textureSize.y);"
 			"float age = (timestampBase - timestamp) / ticksPerFrame;"
-			"vec3 alphas = vec3(10.0 * exp((-age - 0.66) * 2.0), 10.0 * exp(-(age - 0.33) * 2.0), 10.0 * exp(-age * 2.0));"
+			"vec3 alphas = vec3(10.0 * exp((-age - 1.33) * 2.0), 10.0 * exp(-(age - 0.66) * 2.0), 10.0 * exp(-age * 2.0));"
 //			"alpha = min(10.0 * exp(-age * 2.0), 1.0);"
 			"alpha = dot(alphas, filterCoefficients);"
 
@@ -512,7 +512,7 @@ void OpenGLOutputBuilder::prepare_rgb_output_shader()
 		glUniform1f(ticksPerFrameUniform, (GLfloat)(_cycles_per_line * _height_of_display));
 		glUniform2f(positionConversionUniform, _horizontal_scan_period, _vertical_scan_period / (unsigned int)_vertical_period_divider);
 
-		SignalProcessing::FIRFilter filter(3, 3 * 50, 0, 25, SignalProcessing::FIRFilter::DefaultAttenuation);
+		SignalProcessing::FIRFilter filter(3, 6 * 50, 0, 25, SignalProcessing::FIRFilter::DefaultAttenuation);
 		float coefficients[3];
 		filter.get_coefficients(coefficients);
 		glUniform3fv(filterCoefficients, 1, coefficients);