diff --git a/core/hw/maple/maple_devs.cpp b/core/hw/maple/maple_devs.cpp
index beaa97517..255f7e0f9 100755
--- a/core/hw/maple/maple_devs.cpp
+++ b/core/hw/maple/maple_devs.cpp
@@ -1384,7 +1384,7 @@ maple_device* maple_Create(MapleDeviceType type)
 static void screenToNative(int& x, int& y, int width, int height)
 {
 	float fx, fy;
-	if ((float)width / height >= 640.f / 480.f)
+	if (!config::Rotate90)
 	{
 		float scale = 480.f / height;
 		fy = y * scale;
@@ -1416,7 +1416,7 @@ void SetMousePosition(int x, int y, int width, int height, u32 mouseId)
 	{
 		int t = y;
 		y = x;
-		x = height - t;
+		x = height - 1 - t;
 		std::swap(width, height);
 	}
 	screenToNative(x, y, width, height);
diff --git a/core/nullDC.cpp b/core/nullDC.cpp
index 8edd92e5a..3456f9cc2 100644
--- a/core/nullDC.cpp
+++ b/core/nullDC.cpp
@@ -728,11 +728,21 @@ void dc_resume()
 	SetMemoryHandlers();
 	settings.aica.NoBatch = config::ForceWindowsCE || config::DSPEnabled;
 	int hres;
-	if ((config::Widescreen || cheatManager.isActive()) && !config::Rotate90)
+	int vres = config::RenderResolution;
+	if (config::Widescreen && !config::Rotate90)
+	{
 		hres = config::RenderResolution * 16 / 9;
-	else
+	}
+	else if (config::Rotate90)
+	{
+		vres = vres * config::ScreenStretching / 100;
 		hres = config::RenderResolution * 4 / 3;
-	renderer->Resize(hres, config::RenderResolution);
+	}
+	else
+	{
+		hres = config::RenderResolution * 4 * config::ScreenStretching / 3 / 100;
+	}
+	renderer->Resize(hres, vres);
 
 	EventManager::event(Event::Resume);
 	if (!emu_thread.thread.joinable())
diff --git a/core/rend/gles/gldraw.cpp b/core/rend/gles/gldraw.cpp
index e1a454d68..3346bb4a9 100644
--- a/core/rend/gles/gldraw.cpp
+++ b/core/rend/gles/gldraw.cpp
@@ -637,7 +637,12 @@ void DrawStrips()
 
 void DrawFramebuffer()
 {
-	int sx = (int)roundf((gl.ofbo.width - 4.f / 3.f * gl.ofbo.height) / 2.f);
+	float aspectRatio = 4.f / 3.f;
+	if (config::Rotate90)
+		aspectRatio /= config::ScreenStretching / 100.f;
+	else
+		aspectRatio *= config::ScreenStretching / 100.f;
+	int sx = (int)roundf((gl.ofbo.width - aspectRatio * gl.ofbo.height) / 2.f);
 	glViewport(sx, 0, gl.ofbo.width - sx * 2, gl.ofbo.height);
 	drawQuad(fbTextureId, false, true);
 	glcache.DeleteTextures(1, &fbTextureId);
diff --git a/core/rend/gui.cpp b/core/rend/gui.cpp
index c4c4349a9..ec4bcc87b 100644
--- a/core/rend/gui.cpp
+++ b/core/rend/gui.cpp
@@ -2187,29 +2187,21 @@ std::pair<float, float> getCrosshairPosition(int playerNum)
 {
 	float fx = mo_x_abs[playerNum];
 	float fy = mo_y_abs[playerNum];
-	int width = screen_width;
-	int height = screen_height;
+	float width = 640.f;
+	float height = 480.f;
+
 	if (config::Rotate90)
 	{
 		float t = fy;
-		fy = width - fx;
+		fy = 639.f - fx;
 		fx = t;
 		std::swap(width, height);
 	}
-	if ((float)width / height >= 640.f / 480.f)
-	{
-		float scale = 480.f / height;
-		fy /= scale;
-		scale *= config::ScreenStretching / 100.f;
-		fx = fx / scale + (width - 640.f / scale) / 2.f;
-	}
-	else
-	{
-		float scale = 640.f / width;
-		fx /= scale;
-		scale *= config::ScreenStretching / 100.f;
-		fy = fy / scale + (height - 480.f / scale) / 2.f;
-	}
+	float scale = height / screen_height;
+	fy /= scale;
+	scale /= config::ScreenStretching / 100.f;
+	fx = fx / scale + (screen_width - width / scale) / 2.f;
+
 	return std::make_pair(fx, fy);
 }
 
diff --git a/core/rend/transform_matrix.h b/core/rend/transform_matrix.h
index 0dcc50e24..676403d15 100644
--- a/core/rend/transform_matrix.h
+++ b/core/rend/transform_matrix.h
@@ -137,11 +137,22 @@ public:
 			float y_coef;
 			glm::mat4 trans_rot;
 
-			float dc2s_scale_h = renderViewport.y / 480.0f;
+			if (config::Rotate90)
+			{
+				float dc2s_scale_h = renderViewport.x / 640.0f;
 
-			sidebarWidth =  (renderViewport.x - dc2s_scale_h * 640.0f * screen_stretching) / 2;
-			x_coef = 2.0f / (renderViewport.x / dc2s_scale_h * scale_x) * screen_stretching;
-			y_coef = 2.0f / dcViewport.y * (invertY ? -1 : 1);
+				sidebarWidth = 0;
+				y_coef = 2.0f / (renderViewport.y / dc2s_scale_h * scale_y) * screen_stretching * (invertY ? -1 : 1);
+				x_coef = 2.0f / dcViewport.x;
+			}
+			else
+			{
+				float dc2s_scale_h = renderViewport.y / 480.0f;
+
+				sidebarWidth =  (renderViewport.x - dc2s_scale_h * 640.0f * screen_stretching) / 2;
+				x_coef = 2.0f / (renderViewport.x / dc2s_scale_h * scale_x) * screen_stretching;
+				y_coef = 2.0f / dcViewport.y * (invertY ? -1 : 1);
+			}
 			trans_rot = glm::translate(glm::vec3(-1 + 2 * sidebarWidth / renderViewport.x, invertY ? 1 : -1, 0));
 
 			normalMatrix = trans_rot
diff --git a/core/rend/vulkan/overlay.cpp b/core/rend/vulkan/overlay.cpp
index 94209263e..3ba3a02f9 100644
--- a/core/rend/vulkan/overlay.cpp
+++ b/core/rend/vulkan/overlay.cpp
@@ -69,7 +69,6 @@ const std::vector<vk::UniqueCommandBuffer>* VulkanOverlay::Prepare(vk::CommandPo
 	{
 		const u32* texData = getCrosshairTextureData();
 		xhairTexture = createTexture(commandPool, 16, 16, (u8*)texData);
-//		delete [] texData;
 	}
 
 	return &commandBuffers[context->GetCurrentImageIndex()];
@@ -141,7 +140,8 @@ void VulkanOverlay::Draw(vk::Extent2D viewport, float scaling, bool vmu, bool cr
 			y -= XHAIR_HEIGHT / 2;
 			vk::Viewport viewport(x, y, XHAIR_WIDTH, XHAIR_HEIGHT);
 			commandBuffer.setViewport(0, 1, &viewport);
-			commandBuffer.setScissor(0, vk::Rect2D(vk::Offset2D(x, y), vk::Extent2D(XHAIR_WIDTH, XHAIR_HEIGHT)));
+			commandBuffer.setScissor(0, vk::Rect2D(vk::Offset2D(std::max(0.f, x), std::max(0.f, y)),
+					vk::Extent2D(XHAIR_WIDTH, XHAIR_HEIGHT)));
 			u32 color = config::CrosshairColor[i];
 			float xhairColor[4] {
 				(color & 0xff) / 255.f,