diff --git a/Machines/AmstradCPC/AmstradCPC.cpp b/Machines/AmstradCPC/AmstradCPC.cpp
index c8e7da431..95ce484d0 100644
--- a/Machines/AmstradCPC/AmstradCPC.cpp
+++ b/Machines/AmstradCPC/AmstradCPC.cpp
@@ -339,7 +339,7 @@ class CRTCBusHandler {
 					"uint sample = texture(texID, coordinate).r;"
 					"return vec3(float((sample >> 4) & 3u), float((sample >> 2) & 3u), float(sample & 3u)) / 2.0;"
 				"}");
-			crt_->set_visible_area(Outputs::CRT::Rect(0.1072f, 0.08f, 0.875f, 0.875f));
+			crt_->set_visible_area(Outputs::CRT::Rect(0.1072f, 0.1f, 0.842105263157895f, 0.842105263157895f));
 			crt_->set_video_signal(Outputs::CRT::VideoSignal::RGB);
 		}
 
diff --git a/Machines/AppleII/Video.cpp b/Machines/AppleII/Video.cpp
index b190e72a0..552bad130 100644
--- a/Machines/AppleII/Video.cpp
+++ b/Machines/AppleII/Video.cpp
@@ -23,7 +23,7 @@ VideoBase::VideoBase() :
 
 	// Show only the centre 75% of the TV frame.
 	crt_->set_video_signal(Outputs::CRT::VideoSignal::Composite);
-	crt_->set_visible_area(Outputs::CRT::Rect(0.115f, 0.117f, 0.77f, 0.77f));
+	crt_->set_visible_area(Outputs::CRT::Rect(0.115f, 0.122f, 0.77f, 0.77f));
 	crt_->set_immediate_default_phase(0.0f);
 }
 
diff --git a/Machines/Electron/Video.cpp b/Machines/Electron/Video.cpp
index ab0c23b00..445b2f4aa 100644
--- a/Machines/Electron/Video.cpp
+++ b/Machines/Electron/Video.cpp
@@ -62,7 +62,7 @@ VideoOutput::VideoOutput(uint8_t *memory) : ram_(memory) {
 	std::unique_ptr<Outputs::CRT::TextureBuilder::Bookender> bookender(new FourBPPBookender);
 	crt_->set_bookender(std::move(bookender));
 	// TODO: as implied below, I've introduced a clock's latency into the graphics pipeline somehow. Investigate.
-	crt_->set_visible_area(crt_->get_rect_for_area(first_graphics_line - 3, 256, (first_graphics_cycle+1) * crt_cycles_multiplier, 80 * crt_cycles_multiplier, 4.0f / 3.0f));
+	crt_->set_visible_area(crt_->get_rect_for_area(first_graphics_line - 1, 256, (first_graphics_cycle+1) * crt_cycles_multiplier, 80 * crt_cycles_multiplier, 4.0f / 3.0f));
 }
 
 // MARK: - CRT getter
diff --git a/Machines/Oric/Video.cpp b/Machines/Oric/Video.cpp
index 600bb4cc4..9022e14a5 100644
--- a/Machines/Oric/Video.cpp
+++ b/Machines/Oric/Video.cpp
@@ -42,7 +42,7 @@ VideoOutput::VideoOutput(uint8_t *memory) :
 	crt_->set_composite_function_type(Outputs::CRT::CRT::CompositeSourceType::DiscreteFourSamplesPerCycle, 0.0f);
 
 	set_video_signal(Outputs::CRT::VideoSignal::Composite);
-	crt_->set_visible_area(crt_->get_rect_for_area(53, 224, 16 * 6, 40 * 6, 4.0f / 3.0f));
+	crt_->set_visible_area(crt_->get_rect_for_area(54, 224, 16 * 6, 40 * 6, 4.0f / 3.0f));
 }
 
 void VideoOutput::set_video_signal(Outputs::CRT::VideoSignal video_signal) {
diff --git a/Outputs/CRT/CRT.cpp b/Outputs/CRT/CRT.cpp
index 4b8e678d8..3535f33ab 100644
--- a/Outputs/CRT/CRT.cpp
+++ b/Outputs/CRT/CRT.cpp
@@ -19,7 +19,7 @@ void CRT::set_new_timing(unsigned int cycles_per_line, unsigned int height_of_di
 	openGL_output_builder_.set_colour_format(colour_space, colour_cycle_numerator, colour_cycle_denominator);
 
 	const unsigned int millisecondsHorizontalRetraceTime = 7;	// source: Dictionary of Video and Television Technology, p. 234
-	const unsigned int scanlinesVerticalRetraceTime = 10;		// source: ibid
+	const unsigned int scanlinesVerticalRetraceTime = 8;		// source: ibid
 
 																// To quote:
 																//