diff --git a/.gitignore b/.gitignore
index 4d5d0f69..b2dfaa67 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@
 font_easter.png
 font_easter.rft
 font_fu32.rft
+VBO_Example.java
 
 /target/
 !/target/*.jar
diff --git a/libs/raspi2fb b/libs/raspi2fb
new file mode 100644
index 00000000..fe7e2345
Binary files /dev/null and b/libs/raspi2fb differ
diff --git a/src/main/java/org/warp/picalculator/Main.java b/src/main/java/org/warp/picalculator/Main.java
index 3b796248..be22cc22 100755
--- a/src/main/java/org/warp/picalculator/Main.java
+++ b/src/main/java/org/warp/picalculator/Main.java
@@ -1,5 +1,12 @@
 package org.warp.picalculator;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URISyntaxException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
 import org.warp.picalculator.device.Keyboard;
 import org.warp.picalculator.device.PIHardwareDisplay;
 import org.warp.picalculator.gui.CalculatorHUD;
@@ -47,6 +54,11 @@ public class Main {
 		if (Utils.isRunningOnRaspberry() && !Utils.isInArray("-noraspi", args) && isRaspi) {
 			Gpio.wiringPiSetupPhys();
 			Gpio.pinMode(12, Gpio.PWM_OUTPUT);
+			try {
+			Files.createFile(Paths.get("/boot/warppi_loaded"));
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
 		} else {
 			StaticVars.screenPos = new int[] { 0, 0 };
 			StaticVars.debugOn = true;
diff --git a/src/main/java/org/warp/picalculator/Utils.java b/src/main/java/org/warp/picalculator/Utils.java
index 7fce8632..f2c79f5c 100755
--- a/src/main/java/org/warp/picalculator/Utils.java
+++ b/src/main/java/org/warp/picalculator/Utils.java
@@ -76,6 +76,7 @@ public class Utils {
 	public static String forceEngine;
 	public static boolean msDosMode;
 	public static boolean debugCache;
+	public static boolean newtMode = true;
 	
 	public static final class AdvancedOutputStream extends StringWriter {
 		
diff --git a/src/main/java/org/warp/picalculator/gui/DisplayManager.java b/src/main/java/org/warp/picalculator/gui/DisplayManager.java
index dd0b79ab..62d14a9c 100755
--- a/src/main/java/org/warp/picalculator/gui/DisplayManager.java
+++ b/src/main/java/org/warp/picalculator/gui/DisplayManager.java
@@ -303,7 +303,9 @@ public final class DisplayManager implements RenderingLoop {
 
 		if (error != null) {
 			BinaryFont fnt = Utils.getFont(false, false);
-			fnt.use(engine);
+			if (fnt != null && fnt != engine.getRenderer().getCurrentFont()) {
+				fnt.use(engine);
+			}
 			renderer.glColor3i(129, 28, 22);
 			renderer.glDrawStringRight(StaticVars.screenSize[0] - 2, StaticVars.screenSize[1] - (fnt.getCharacterHeight() + 2), StaticVars.calculatorNameUPPER + " CALCULATOR");
 			renderer.glColor3i(149, 32, 26);
@@ -314,11 +316,15 @@ public final class DisplayManager implements RenderingLoop {
 				renderer.glDrawStringLeft(2, 22 + i, stackPart);
 				i += 11;
 			}
-			fonts[0].use(engine);
+			if (fonts[0] != null && fonts[0] != engine.getRenderer().getCurrentFont()) {
+				fonts[0].use(engine);
+			}
 			renderer.glColor3i(129, 28, 22);
 			renderer.glDrawStringCenter((StaticVars.screenSize[0] / 2), 11, "UNEXPECTED EXCEPTION");
 		} else {
-			fonts[0].use(engine);
+			if (fonts[0] != null && fonts[0] != engine.getRenderer().getCurrentFont()) {
+				fonts[0].use(engine);
+			}
 			hud.renderBackground();
 			screen.render();
 			hud.render();
diff --git a/src/main/java/org/warp/picalculator/gui/graphicengine/framebuffer/FBEngine.java b/src/main/java/org/warp/picalculator/gui/graphicengine/framebuffer/FBEngine.java
index ece1968a..4cb70b45 100644
--- a/src/main/java/org/warp/picalculator/gui/graphicengine/framebuffer/FBEngine.java
+++ b/src/main/java/org/warp/picalculator/gui/graphicengine/framebuffer/FBEngine.java
@@ -143,7 +143,7 @@ public class FBEngine implements GraphicEngine {
 		realFb.getBuffer().clear();
 		realFb.getBuffer().put(fb);
 		for (int i = 0; i < fb.capacity()/2; i++) {
-			realFb.getBuffer().put(i, (byte) (0xFF));
+			realFb.getBuffer().put(i, (byte) (_________________TMP < 50 ? 0xFF : 0xF0));
 		}
 		for (int i = fb.capacity()/2; i < fb.capacity(); i++) {
 			realFb.getBuffer().put(i, (byte) (0x18));
@@ -184,6 +184,7 @@ public class FBEngine implements GraphicEngine {
 		if (Utils.headlessOverride) {
 			return false;
 		}
+		/*
 		File fbFile = new File("/dev/fb1");
 		try {
 			fbFileRW = new RandomAccessFile(fbFile, "rw");
@@ -194,6 +195,7 @@ public class FBEngine implements GraphicEngine {
 			System.err.println("Cannot read framebuffer fb1.");
 			ex.printStackTrace();
 		}
+		*/
 		return false;
 	}
 
diff --git a/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPUEngine.java b/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPUEngine.java
index 763b4d03..6e4792d9 100755
--- a/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPUEngine.java
+++ b/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPUEngine.java
@@ -193,4 +193,4 @@ public class GPUEngine implements GraphicEngine {
 		return registeredFonts;
 	}
 
-}
+}
\ No newline at end of file
diff --git a/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPURenderer.java b/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPURenderer.java
index ab118a5e..25cf9285 100755
--- a/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPURenderer.java
+++ b/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/GPURenderer.java
@@ -292,13 +292,46 @@ public class GPURenderer implements Renderer {
 		return tex;
 	}
 
-	public void startDrawCycle(boolean first) {
+	public void initDrawCycle() {
+		final boolean textureChange = precTexEnabled != currentTexEnabled || precTex != currentTex;
+		startDrawSegment(false);
+		if (textureChange) {
+			changeTexture();
+		}
 		if (fbVertices == null) {
 			fbVertices = Buffers.newDirectFloatBuffer(3 * ELEMENT_VERTICES_COUNT * ELEMENTS_MAX_COUNT_PER_BUFFER);
 			txVertices = Buffers.newDirectFloatBuffer(2 * ELEMENT_VERTICES_COUNT * ELEMENTS_MAX_COUNT_PER_BUFFER);
 			colVertices = Buffers.newDirectFloatBuffer(4 * ELEMENT_VERTICES_COUNT * ELEMENTS_MAX_COUNT_PER_BUFFER);
 		}
-		if (first || fbVertices == null || cycleEnded) {
+	}
+
+	public void endDrawCycle() {
+		final boolean textureChange = precTexEnabled != currentTexEnabled || precTex != currentTex;
+		if (textureChange) {
+			if (fbElements > 0) {
+				endDrawSegment();
+			}
+			changeTexture();
+		} else {
+			if (fbElements > 0) {
+				endDrawSegment();
+			}
+		}
+	}
+	
+	private void changeTexture() {
+		precTexEnabled = currentTexEnabled;
+		precTex = currentTex;
+		if (currentTexEnabled) {
+			gl.glEnable(GL.GL_TEXTURE_2D);
+			currentTex.bind(gl);
+		} else {
+			gl.glDisable(GL.GL_TEXTURE_2D);
+		}
+	}
+	
+	public void startDrawSegment(boolean continuation) {
+		if (!continuation || cycleEnded) {
 			fbElements = 0;
 		}
 		cycleEnded = false;
@@ -308,42 +341,24 @@ public class GPURenderer implements Renderer {
 	private Texture precTex;
 	private boolean cycleEnded = true;
 
-	public void updateDrawCycle() {
-		updateDrawCycle(false, false);
-	}
-
-	public void updateDrawCycle(boolean first, boolean last) {
+	public void doDrawSegment() {
 		final boolean textureChange = precTexEnabled != currentTexEnabled || precTex != currentTex;
-		final boolean changeRequired = last || fbElements >= ELEMENTS_MAX_COUNT_PER_BUFFER;
-		if (first) {
-			startDrawCycle(true);
-		}
+		final boolean changeRequired = fbElements >= ELEMENTS_MAX_COUNT_PER_BUFFER;
 		if (textureChange) {
-			if (!first && fbElements > 0) {
-				endDrawCycle();
-				if (!last) {
-					startDrawCycle(true);
-				}
+			if (fbElements > 0) {
+				endDrawSegment();
+				startDrawSegment(false);
 			}
-			precTexEnabled = currentTexEnabled;
-			precTex = currentTex;
-			if (currentTexEnabled) {
-				gl.glEnable(GL.GL_TEXTURE_2D);
-				currentTex.bind(gl);
-			} else {
-				gl.glDisable(GL.GL_TEXTURE_2D);
-			}
-		} else if (!first) {
+			changeTexture();
+		} else {
 			if (fbElements > 0 && changeRequired) {
-				endDrawCycle();
-				if (!last) {
-					startDrawCycle(false);
-				}
+				endDrawSegment();
+				startDrawSegment(true);
 			}
 		}
 	}
 
-	public void endDrawCycle() {
+	public void endDrawSegment() {
 		fbVertices.limit(fbVertices.position());
 		txVertices.limit(txVertices.position());
 		colVertices.limit(colVertices.position());
@@ -380,18 +395,18 @@ public class GPURenderer implements Renderer {
 	public void glClearSkin() {
 		if (currentTex != null) {
 			currentTex = null;
-			updateDrawCycle();
+			doDrawSegment();
 		}
 	}
 
 	void disableTexture() {
 		currentTexEnabled = false;
-		updateDrawCycle();
+		doDrawSegment();
 	}
 
 	void enableTexture() {
 		currentTexEnabled = true;
-		updateDrawCycle();
+		doDrawSegment();
 	}
 
 	void useTexture(Texture t, float w, float h) {
@@ -400,4 +415,4 @@ public class GPURenderer implements Renderer {
 		currentTexHeight = h;
 		enableTexture();
 	}
-}
+}
\ No newline at end of file
diff --git a/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/NEWTWindow.java b/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/NEWTWindow.java
index d14ba35c..9d809ccf 100755
--- a/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/NEWTWindow.java
+++ b/src/main/java/org/warp/picalculator/gui/graphicengine/gpu/NEWTWindow.java
@@ -343,12 +343,12 @@ class NEWTWindow implements GLEventListener {
 		gl.glEnableClientState(GLPointerFunc.GL_COLOR_ARRAY);
 		gl.glEnableClientState(GLPointerFunc.GL_VERTEX_ARRAY);
 		gl.glEnableClientState(GLPointerFunc.GL_TEXTURE_COORD_ARRAY);
-		
-		renderer.updateDrawCycle(true, false);
+
+		renderer.initDrawCycle();
 
 		disp.repaint();
 
-		renderer.updateDrawCycle(false, true);
+		renderer.endDrawCycle();
 
 		GPURenderer.gl = null;
 
diff --git a/src/main/jni/libpicalc.so b/src/main/jni/libpicalc.so
new file mode 100644
index 00000000..25c9e68c
Binary files /dev/null and b/src/main/jni/libpicalc.so differ
diff --git a/src/main/resources/libpicalc.so b/src/main/resources/libpicalc.so
new file mode 100644
index 00000000..25c9e68c
Binary files /dev/null and b/src/main/resources/libpicalc.so differ