diff --git a/build.gradle b/build.gradle
index 69b2cb01f..bd89387a1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@
     }
     dependencies {
         classpath 'com.google.code.gson:gson:2.8.1'
-        classpath 'net.minecraftforge.gradle:ForgeGradle:3.0.169'
+        classpath 'net.minecraftforge.gradle:ForgeGradle:3.0.179'
         classpath 'net.sf.proguard:proguard-gradle:6.1.0beta2'
         classpath 'org.ajoberstar.grgit:grgit-gradle:3.0.0'
     }
diff --git a/src/main/java/dan200/computercraft/ComputerCraft.java b/src/main/java/dan200/computercraft/ComputerCraft.java
index bcac1d468..d712dc914 100644
--- a/src/main/java/dan200/computercraft/ComputerCraft.java
+++ b/src/main/java/dan200/computercraft/ComputerCraft.java
@@ -93,14 +93,17 @@ public final class ComputerCraft
 
     public static boolean genericPeripheral = false;
 
-    public static final int terminalWidth_computer = 51;
-    public static final int terminalHeight_computer = 19;
+    public static int computerTermWidth = 51;
+    public static int computerTermHeight = 19;
 
-    public static final int terminalWidth_turtle = 39;
-    public static final int terminalHeight_turtle = 13;
+    public static final int turtleTermWidth = 39;
+    public static final int turtleTermHeight = 13;
 
-    public static final int terminalWidth_pocketComputer = 26;
-    public static final int terminalHeight_pocketComputer = 20;
+    public static int pocketTermWidth = 26;
+    public static int pocketTermHeight = 20;
+
+    public static int monitorWidth = 8;
+    public static int monitorHeight = 6;
 
     public static final class TurtleUpgrades
     {
diff --git a/src/main/java/dan200/computercraft/client/gui/GuiComputer.java b/src/main/java/dan200/computercraft/client/gui/GuiComputer.java
index b61cb24ff..3008c9386 100644
--- a/src/main/java/dan200/computercraft/client/gui/GuiComputer.java
+++ b/src/main/java/dan200/computercraft/client/gui/GuiComputer.java
@@ -9,6 +9,7 @@
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.widgets.WidgetTerminal;
 import dan200.computercraft.client.gui.widgets.WidgetWrapper;
+import dan200.computercraft.client.render.ComputerBorderRenderer;
 import dan200.computercraft.shared.computer.core.ClientComputer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.inventory.ContainerComputer;
@@ -17,21 +18,18 @@
 import dan200.computercraft.shared.pocket.inventory.ContainerPocketComputer;
 import net.minecraft.client.gui.screen.inventory.ContainerScreen;
 import net.minecraft.entity.player.PlayerInventory;
-import net.minecraft.util.ResourceLocation;
 import net.minecraft.util.text.ITextComponent;
 import org.lwjgl.glfw.GLFW;
 
+import static dan200.computercraft.client.render.ComputerBorderRenderer.BORDER;
+import static dan200.computercraft.client.render.ComputerBorderRenderer.MARGIN;
+
 public final class GuiComputer<T extends ContainerComputerBase> extends ContainerScreen<T>
 {
-    public static final ResourceLocation BACKGROUND_NORMAL = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_normal.png" );
-    public static final ResourceLocation BACKGROUND_ADVANCED = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_advanced.png" );
-    public static final ResourceLocation BACKGROUND_COMMAND = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_command.png" );
-    public static final ResourceLocation BACKGROUND_COLOUR = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_colour.png" );
-
-    private final ComputerFamily m_family;
-    private final ClientComputer m_computer;
-    private final int m_termWidth;
-    private final int m_termHeight;
+    private final ComputerFamily family;
+    private final ClientComputer computer;
+    private final int termWidth;
+    private final int termHeight;
 
     private WidgetTerminal terminal;
     private WidgetWrapper terminalWrapper;
@@ -41,10 +39,10 @@ private GuiComputer(
     )
     {
         super( container, player, title );
-        m_family = container.getFamily();
-        m_computer = (ClientComputer) container.getComputer();
-        m_termWidth = termWidth;
-        m_termHeight = termHeight;
+        family = container.getFamily();
+        computer = (ClientComputer) container.getComputer();
+        this.termWidth = termWidth;
+        this.termHeight = termHeight;
         terminal = null;
     }
 
@@ -52,7 +50,7 @@ public static GuiComputer<ContainerComputer> create( ContainerComputer container
     {
         return new GuiComputer<>(
             container, inventory, component,
-            ComputerCraft.terminalWidth_computer, ComputerCraft.terminalHeight_computer
+            ComputerCraft.computerTermWidth, ComputerCraft.computerTermHeight
         );
     }
 
@@ -60,7 +58,7 @@ public static GuiComputer<ContainerPocketComputer> createPocket( ContainerPocket
     {
         return new GuiComputer<>(
             container, inventory, component,
-            ComputerCraft.terminalWidth_pocketComputer, ComputerCraft.terminalHeight_pocketComputer
+            ComputerCraft.pocketTermWidth, ComputerCraft.pocketTermHeight
         );
     }
 
@@ -78,16 +76,16 @@ protected void init()
     {
         minecraft.keyboardListener.enableRepeatEvents( true );
 
-        int termPxWidth = m_termWidth * FixedWidthFontRenderer.FONT_WIDTH;
-        int termPxHeight = m_termHeight * FixedWidthFontRenderer.FONT_HEIGHT;
+        int termPxWidth = termWidth * FixedWidthFontRenderer.FONT_WIDTH;
+        int termPxHeight = termHeight * FixedWidthFontRenderer.FONT_HEIGHT;
 
-        xSize = termPxWidth + 4 + 24;
-        ySize = termPxHeight + 4 + 24;
+        xSize = termPxWidth + MARGIN * 2 + BORDER * 2;
+        ySize = termPxHeight + MARGIN * 2 + BORDER * 2;
 
         super.init();
 
-        terminal = new WidgetTerminal( minecraft, () -> m_computer, m_termWidth, m_termHeight, 2, 2, 2, 2 );
-        terminalWrapper = new WidgetWrapper( terminal, 2 + 12 + guiLeft, 2 + 12 + guiTop, termPxWidth, termPxHeight );
+        terminal = new WidgetTerminal( minecraft, () -> computer, termWidth, termHeight, MARGIN, MARGIN, MARGIN, MARGIN );
+        terminalWrapper = new WidgetWrapper( terminal, MARGIN + BORDER + guiLeft, MARGIN + BORDER + guiTop, termPxWidth, termPxHeight );
 
         children.add( terminalWrapper );
         setFocused( terminalWrapper );
@@ -124,41 +122,16 @@ public boolean keyPressed( int key, int scancode, int modifiers )
     @Override
     public void drawGuiContainerBackgroundLayer( float partialTicks, int mouseX, int mouseY )
     {
-        // Work out where to draw
-        int startX = terminalWrapper.getX() - 2;
-        int startY = terminalWrapper.getY() - 2;
-        int endX = startX + terminalWrapper.getWidth() + 4;
-        int endY = startY + terminalWrapper.getHeight() + 4;
-
         // Draw terminal
         terminal.draw( terminalWrapper.getX(), terminalWrapper.getY() );
 
         // Draw a border around the terminal
-        RenderSystem.color4f( 1.0f, 1.0f, 1.0f, 1.0f );
-        switch( m_family )
-        {
-            case NORMAL:
-            default:
-                minecraft.getTextureManager().bindTexture( BACKGROUND_NORMAL );
-                break;
-            case ADVANCED:
-                minecraft.getTextureManager().bindTexture( BACKGROUND_ADVANCED );
-                break;
-            case COMMAND:
-                minecraft.getTextureManager().bindTexture( BACKGROUND_COMMAND );
-                break;
-        }
-
-        blit( startX - 12, startY - 12, 12, 28, 12, 12 );
-        blit( startX - 12, endY, 12, 40, 12, 12 );
-        blit( endX, startY - 12, 24, 28, 12, 12 );
-        blit( endX, endY, 24, 40, 12, 12 );
-
-        blit( startX, startY - 12, 0, 0, endX - startX, 12 );
-        blit( startX, endY, 0, 12, endX - startX, 12 );
-
-        blit( startX - 12, startY, 0, 28, 12, endY - startY );
-        blit( endX, startY, 36, 28, 12, endY - startY );
+        RenderSystem.color4f( 1, 1, 1, 1 );
+        minecraft.getTextureManager().bindTexture( ComputerBorderRenderer.getTexture( family ) );
+        ComputerBorderRenderer.render(
+            terminalWrapper.getX() - MARGIN, terminalWrapper.getY() - MARGIN, getBlitOffset(),
+            terminalWrapper.getWidth() + MARGIN * 2, terminalWrapper.getHeight() + MARGIN * 2
+        );
     }
 
     @Override
diff --git a/src/main/java/dan200/computercraft/client/gui/GuiTurtle.java b/src/main/java/dan200/computercraft/client/gui/GuiTurtle.java
index 7a43c7702..517cf140f 100644
--- a/src/main/java/dan200/computercraft/client/gui/GuiTurtle.java
+++ b/src/main/java/dan200/computercraft/client/gui/GuiTurtle.java
@@ -49,13 +49,13 @@ protected void init()
         super.init();
         minecraft.keyboardListener.enableRepeatEvents( true );
 
-        int termPxWidth = ComputerCraft.terminalWidth_turtle * FixedWidthFontRenderer.FONT_WIDTH;
-        int termPxHeight = ComputerCraft.terminalHeight_turtle * FixedWidthFontRenderer.FONT_HEIGHT;
+        int termPxWidth = ComputerCraft.turtleTermWidth * FixedWidthFontRenderer.FONT_WIDTH;
+        int termPxHeight = ComputerCraft.turtleTermHeight * FixedWidthFontRenderer.FONT_HEIGHT;
 
         terminal = new WidgetTerminal(
             minecraft, () -> m_computer,
-            ComputerCraft.terminalWidth_turtle,
-            ComputerCraft.terminalHeight_turtle,
+            ComputerCraft.turtleTermWidth,
+            ComputerCraft.turtleTermHeight,
             2, 2, 2, 2
         );
         terminalWrapper = new WidgetWrapper( terminal, 2 + 8 + guiLeft, 2 + 8 + guiTop, termPxWidth, termPxHeight );
diff --git a/src/main/java/dan200/computercraft/client/render/ComputerBorderRenderer.java b/src/main/java/dan200/computercraft/client/render/ComputerBorderRenderer.java
new file mode 100644
index 000000000..9c784d7fc
--- /dev/null
+++ b/src/main/java/dan200/computercraft/client/render/ComputerBorderRenderer.java
@@ -0,0 +1,175 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2020. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.client.render;
+
+import com.mojang.blaze3d.systems.RenderSystem;
+import com.mojang.blaze3d.vertex.IVertexBuilder;
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.shared.computer.core.ComputerFamily;
+import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.renderer.Matrix4f;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.minecraft.util.ResourceLocation;
+import org.lwjgl.opengl.GL11;
+
+import javax.annotation.Nonnull;
+
+public class ComputerBorderRenderer
+{
+    public static final ResourceLocation BACKGROUND_NORMAL = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_normal.png" );
+    public static final ResourceLocation BACKGROUND_ADVANCED = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_advanced.png" );
+    public static final ResourceLocation BACKGROUND_COMMAND = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_command.png" );
+    public static final ResourceLocation BACKGROUND_COLOUR = new ResourceLocation( ComputerCraft.MOD_ID, "textures/gui/corners_colour.png" );
+
+    private static final Matrix4f IDENTITY = new Matrix4f();
+
+    static
+    {
+        IDENTITY.setIdentity();
+    }
+
+    /**
+     * The margin between the terminal and its border.
+     */
+    public static final int MARGIN = 2;
+
+    /**
+     * The width of the terminal border.
+     */
+    public static final int BORDER = 12;
+
+    private static final int CORNER_TOP_Y = 28;
+    private static final int CORNER_BOTTOM_Y = CORNER_TOP_Y + BORDER;
+    private static final int CORNER_LEFT_X = BORDER;
+    private static final int CORNER_RIGHT_X = CORNER_LEFT_X + BORDER;
+    private static final int BORDER_RIGHT_X = 36;
+    private static final int GAP = 4;
+
+    private static final float TEX_SCALE = 1 / 256.0f;
+
+    private final Matrix4f transform;
+    private final IVertexBuilder builder;
+    private final int z;
+    private final float r, g, b;
+
+    public ComputerBorderRenderer( Matrix4f transform, IVertexBuilder builder, int z, float r, float g, float b )
+    {
+        this.transform = transform;
+        this.builder = builder;
+        this.z = z;
+        this.r = r;
+        this.g = g;
+        this.b = b;
+    }
+
+
+    @Nonnull
+    public static ResourceLocation getTexture( @Nonnull ComputerFamily family )
+    {
+        switch( family )
+        {
+            case NORMAL:
+            default:
+                return BACKGROUND_NORMAL;
+            case ADVANCED:
+                return BACKGROUND_ADVANCED;
+            case COMMAND:
+                return BACKGROUND_COMMAND;
+        }
+    }
+
+    public static void render( int x, int y, int z, int width, int height )
+    {
+        Tessellator tessellator = Tessellator.getInstance();
+        BufferBuilder buffer = tessellator.getBuffer();
+        buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_COLOR_TEX );
+
+        render( IDENTITY, buffer, x, y, z, width, height );
+
+        RenderSystem.enableAlphaTest();
+        tessellator.draw();
+    }
+
+    public static void render( Matrix4f transform, IVertexBuilder buffer, int x, int y, int z, int width, int height )
+    {
+        render( transform, buffer, x, y, z, width, height, 1, 1, 1 );
+    }
+
+    public static void render( Matrix4f transform, IVertexBuilder buffer, int x, int y, int z, int width, int height, float r, float g, float b )
+    {
+        render( transform, buffer, x, y, z, width, height, 0, r, g, b );
+    }
+
+    public static void render( Matrix4f transform, IVertexBuilder buffer, int x, int y, int z, int width, int height, int borderHeight, float r, float g, float b )
+    {
+        new ComputerBorderRenderer( transform, buffer, z, r, g, b ).doRender( x, y, width, height, borderHeight );
+    }
+
+    public void doRender( int x, int y, int width, int height, int bottomHeight )
+    {
+        int endX = x + width;
+        int endY = y + height;
+
+        // Vertical bars
+        renderLine( x - BORDER, y, 0, CORNER_TOP_Y, BORDER, endY - y );
+        renderLine( endX, y, BORDER_RIGHT_X, CORNER_TOP_Y, BORDER, endY - y );
+
+        // Top bar
+        renderLine( x, y - BORDER, 0, 0, endX - x, BORDER );
+        renderCorner( x - BORDER, y - BORDER, CORNER_LEFT_X, CORNER_TOP_Y );
+        renderCorner( endX, y - BORDER, CORNER_RIGHT_X, CORNER_TOP_Y );
+
+        // Bottom bar. We allow for drawing a stretched version, which allows for additional elements (such as the
+        // pocket computer's lights).
+        if( bottomHeight <= 0 )
+        {
+            renderLine( x, endY, 0, BORDER, endX - x, BORDER );
+            renderCorner( x - BORDER, endY, CORNER_LEFT_X, CORNER_BOTTOM_Y );
+            renderCorner( endX, endY, CORNER_RIGHT_X, CORNER_BOTTOM_Y );
+        }
+        else
+        {
+            // Bottom left, middle, right. We do this in three portions: the top inner corners, an extended region for
+            // lights, and then the bottom outer corners.
+            renderTexture( x - BORDER, endY, CORNER_LEFT_X, CORNER_BOTTOM_Y, BORDER, BORDER / 2 );
+            renderTexture( x, endY, 0, BORDER, width, BORDER / 2, BORDER, BORDER / 2 );
+            renderTexture( endX, endY, CORNER_RIGHT_X, CORNER_BOTTOM_Y, BORDER, BORDER / 2 );
+
+            renderTexture( x - BORDER, endY + BORDER / 2, CORNER_LEFT_X, CORNER_BOTTOM_Y + GAP, BORDER, bottomHeight, BORDER, GAP );
+            renderTexture( x, endY + BORDER / 2, 0, BORDER + GAP, width, bottomHeight, BORDER, GAP );
+            renderTexture( endX, endY + BORDER / 2, CORNER_RIGHT_X, CORNER_BOTTOM_Y + GAP, BORDER, bottomHeight, BORDER, GAP );
+
+            renderTexture( x - BORDER, endY + bottomHeight + BORDER / 2, CORNER_LEFT_X, CORNER_BOTTOM_Y + BORDER / 2, BORDER, BORDER / 2 );
+            renderTexture( x, endY + bottomHeight + BORDER / 2, 0, BORDER + BORDER / 2, width, BORDER / 2 );
+            renderTexture( endX, endY + bottomHeight + BORDER / 2, CORNER_RIGHT_X, CORNER_BOTTOM_Y + BORDER / 2, BORDER, BORDER / 2 );
+        }
+    }
+
+    private void renderCorner( int x, int y, int u, int v )
+    {
+        renderTexture( x, y, u, v, BORDER, BORDER, BORDER, BORDER );
+    }
+
+    private void renderLine( int x, int y, int u, int v, int width, int height )
+    {
+        renderTexture( x, y, u, v, width, height, BORDER, BORDER );
+    }
+
+    private void renderTexture( int x, int y, int u, int v, int width, int height )
+    {
+        renderTexture( x, y, u, v, width, height, width, height );
+    }
+
+    private void renderTexture( int x, int y, int u, int v, int width, int height, int textureWidth, int textureHeight )
+    {
+        builder.pos( transform, x, y + height, z ).color( r, g, b, 1.0f ).tex( u * TEX_SCALE, (v + textureHeight) * TEX_SCALE ).endVertex();
+        builder.pos( transform, x + width, y + height, z ).color( r, g, b, 1.0f ).tex( (u + textureWidth) * TEX_SCALE, (v + textureHeight) * TEX_SCALE ).endVertex();
+        builder.pos( transform, x + width, y, z ).color( r, g, b, 1.0f ).tex( (u + textureWidth) * TEX_SCALE, v * TEX_SCALE ).endVertex();
+        builder.pos( transform, x, y, z ).color( r, g, b, 1.0f ).tex( u * TEX_SCALE, v * TEX_SCALE ).endVertex();
+    }
+}
diff --git a/src/main/java/dan200/computercraft/client/render/ItemPocketRenderer.java b/src/main/java/dan200/computercraft/client/render/ItemPocketRenderer.java
index 9e87d4e35..157250d56 100644
--- a/src/main/java/dan200/computercraft/client/render/ItemPocketRenderer.java
+++ b/src/main/java/dan200/computercraft/client/render/ItemPocketRenderer.java
@@ -7,7 +7,6 @@
 
 import com.mojang.blaze3d.matrix.MatrixStack;
 import com.mojang.blaze3d.systems.RenderSystem;
-import com.mojang.blaze3d.vertex.IVertexBuilder;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
@@ -27,7 +26,8 @@
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_WIDTH;
-import static dan200.computercraft.client.gui.GuiComputer.*;
+import static dan200.computercraft.client.render.ComputerBorderRenderer.BORDER;
+import static dan200.computercraft.client.render.ComputerBorderRenderer.MARGIN;
 
 /**
  * Emulates map rendering for pocket computers.
@@ -35,8 +35,6 @@
 @Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT )
 public final class ItemPocketRenderer extends ItemMapLikeRenderer
 {
-    private static final int MARGIN = 2;
-    private static final int FRAME = 12;
     private static final int LIGHT_HEIGHT = 8;
 
     private static final ItemPocketRenderer INSTANCE = new ItemPocketRenderer();
@@ -67,8 +65,8 @@ protected void renderItem( MatrixStack transform, IRenderTypeBuffer render, Item
         int termWidth, termHeight;
         if( terminal == null )
         {
-            termWidth = ComputerCraft.terminalWidth_pocketComputer;
-            termHeight = ComputerCraft.terminalHeight_pocketComputer;
+            termWidth = ComputerCraft.pocketTermWidth;
+            termHeight = ComputerCraft.pocketTermHeight;
         }
         else
         {
@@ -86,7 +84,7 @@ protected void renderItem( MatrixStack transform, IRenderTypeBuffer render, Item
         transform.rotate( Vector3f.ZP.rotationDegrees( 180f ) );
         transform.scale( 0.5f, 0.5f, 0.5f );
 
-        float scale = 0.75f / Math.max( width + FRAME * 2, height + FRAME * 2 + LIGHT_HEIGHT );
+        float scale = 0.75f / Math.max( width + BORDER * 2, height + BORDER * 2 + LIGHT_HEIGHT );
         transform.scale( scale, scale, 0 );
         transform.translate( -0.5 * width, -0.5 * height, 0 );
 
@@ -117,10 +115,8 @@ protected void renderItem( MatrixStack transform, IRenderTypeBuffer render, Item
 
     private static void renderFrame( Matrix4f transform, ComputerFamily family, int colour, int width, int height )
     {
-        Minecraft.getInstance().getTextureManager().bindTexture( colour != -1
-            ? BACKGROUND_COLOUR
-            : family == ComputerFamily.NORMAL ? BACKGROUND_NORMAL : BACKGROUND_ADVANCED
-        );
+        Minecraft.getInstance().getTextureManager()
+            .bindTexture( colour != -1 ? ComputerBorderRenderer.BACKGROUND_COLOUR : ComputerBorderRenderer.getTexture( family ) );
 
         float r = ((colour >>> 16) & 0xFF) / 255.0f;
         float g = ((colour >>> 8) & 0xFF) / 255.0f;
@@ -130,28 +126,7 @@ private static void renderFrame( Matrix4f transform, ComputerFamily family, int
         BufferBuilder buffer = tessellator.getBuffer();
         buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_COLOR_TEX );
 
-        // Top left, middle, right
-        renderTexture( transform, buffer, -FRAME, -FRAME, 12, 28, FRAME, FRAME, r, g, b );
-        renderTexture( transform, buffer, 0, -FRAME, 0, 0, width, FRAME, r, g, b );
-        renderTexture( transform, buffer, width, -FRAME, 24, 28, FRAME, FRAME, r, g, b );
-
-        // Left and bright border
-        renderTexture( transform, buffer, -FRAME, 0, 0, 28, FRAME, height, r, g, b );
-        renderTexture( transform, buffer, width, 0, 36, 28, FRAME, height, r, g, b );
-
-        // Bottom left, middle, right. We do this in three portions: the top inner corners, an extended region for
-        // lights, and then the bottom outer corners.
-        renderTexture( transform, buffer, -FRAME, height, 12, 40, FRAME, FRAME / 2, r, g, b );
-        renderTexture( transform, buffer, 0, height, 0, 12, width, FRAME / 2, r, g, b );
-        renderTexture( transform, buffer, width, height, 24, 40, FRAME, FRAME / 2, r, g, b );
-
-        renderTexture( transform, buffer, -FRAME, height + FRAME / 2, 12, 44, FRAME, LIGHT_HEIGHT, FRAME, 4, r, g, b );
-        renderTexture( transform, buffer, 0, height + FRAME / 2, 0, 16, width, LIGHT_HEIGHT, FRAME, 4, r, g, b );
-        renderTexture( transform, buffer, width, height + FRAME / 2, 24, 44, FRAME, LIGHT_HEIGHT, FRAME, 4, r, g, b );
-
-        renderTexture( transform, buffer, -FRAME, height + LIGHT_HEIGHT + FRAME / 2, 12, 40 + FRAME / 2, FRAME, FRAME / 2, r, g, b );
-        renderTexture( transform, buffer, 0, height + LIGHT_HEIGHT + FRAME / 2, 0, 12 + FRAME / 2, width, FRAME / 2, r, g, b );
-        renderTexture( transform, buffer, width, height + LIGHT_HEIGHT + FRAME / 2, 24, 40 + FRAME / 2, FRAME, FRAME / 2, r, g, b );
+        ComputerBorderRenderer.render( transform, buffer, 0, 0, 0, width, height, LIGHT_HEIGHT, r, g, b );
 
         tessellator.draw();
     }
@@ -168,26 +143,12 @@ private static void renderLight( Matrix4f transform, int colour, int width, int
         Tessellator tessellator = Tessellator.getInstance();
         BufferBuilder buffer = tessellator.getBuffer();
         buffer.begin( GL11.GL_QUADS, DefaultVertexFormats.POSITION_COLOR );
-        buffer.pos( transform, width - LIGHT_HEIGHT * 2, height + LIGHT_HEIGHT + FRAME / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
-        buffer.pos( transform, width, height + LIGHT_HEIGHT + FRAME / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
-        buffer.pos( transform, width, height + FRAME / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
-        buffer.pos( transform, width - LIGHT_HEIGHT * 2, height + FRAME / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
+        buffer.pos( transform, width - LIGHT_HEIGHT * 2, height + LIGHT_HEIGHT + BORDER / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
+        buffer.pos( transform, width, height + LIGHT_HEIGHT + BORDER / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
+        buffer.pos( transform, width, height + BORDER / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
+        buffer.pos( transform, width - LIGHT_HEIGHT * 2, height + BORDER / 2.0f, 0 ).color( r, g, b, 1.0f ).endVertex();
 
         tessellator.draw();
         RenderSystem.enableTexture();
     }
-
-    private static void renderTexture( Matrix4f transform, IVertexBuilder builder, int x, int y, int textureX, int textureY, int width, int height, float r, float g, float b )
-    {
-        renderTexture( transform, builder, x, y, textureX, textureY, width, height, width, height, r, g, b );
-    }
-
-    private static void renderTexture( Matrix4f transform, IVertexBuilder builder, int x, int y, int textureX, int textureY, int width, int height, int textureWidth, int textureHeight, float r, float g, float b )
-    {
-        float scale = 1 / 255.0f;
-        builder.pos( transform, x, y + height, 0 ).color( r, g, b, 1.0f ).tex( textureX * scale, (textureY + textureHeight) * scale ).endVertex();
-        builder.pos( transform, x + width, y + height, 0 ).color( r, g, b, 1.0f ).tex( (textureX + textureWidth) * scale, (textureY + textureHeight) * scale ).endVertex();
-        builder.pos( transform, x + width, y, 0 ).color( r, g, b, 1.0f ).tex( (textureX + textureWidth) * scale, textureY * scale ).endVertex();
-        builder.pos( transform, x, y, 0 ).color( r, g, b, 1.0f ).tex( textureX * scale, textureY * scale ).endVertex();
-    }
 }
diff --git a/src/main/java/dan200/computercraft/client/render/TurtlePlayerRenderer.java b/src/main/java/dan200/computercraft/client/render/TurtlePlayerRenderer.java
index 4c00145f9..4e7cb8e70 100644
--- a/src/main/java/dan200/computercraft/client/render/TurtlePlayerRenderer.java
+++ b/src/main/java/dan200/computercraft/client/render/TurtlePlayerRenderer.java
@@ -7,7 +7,6 @@
 package dan200.computercraft.client.render;
 
 import com.mojang.blaze3d.matrix.MatrixStack;
-import dan200.computercraft.client.gui.GuiComputer;
 import dan200.computercraft.shared.turtle.core.TurtlePlayer;
 import net.minecraft.client.renderer.IRenderTypeBuffer;
 import net.minecraft.client.renderer.entity.EntityRenderer;
@@ -27,7 +26,7 @@ public TurtlePlayerRenderer( EntityRendererManager renderManager )
     @Override
     public ResourceLocation getEntityTexture( @Nonnull TurtlePlayer entity )
     {
-        return GuiComputer.BACKGROUND_NORMAL;
+        return ComputerBorderRenderer.BACKGROUND_NORMAL;
     }
 
     @Override
diff --git a/src/main/java/dan200/computercraft/shared/Config.java b/src/main/java/dan200/computercraft/shared/Config.java
index bfa177156..812ef4c9c 100644
--- a/src/main/java/dan200/computercraft/shared/Config.java
+++ b/src/main/java/dan200/computercraft/shared/Config.java
@@ -73,6 +73,15 @@ public final class Config
     private static final ConfigValue<Boolean> turtlesCanPush;
     private static final ConfigValue<List<? extends String>> turtleDisabledActions;
 
+    private static final ConfigValue<Integer> computerTermWidth;
+    private static final ConfigValue<Integer> computerTermHeight;
+
+    private static final ConfigValue<Integer> pocketTermWidth;
+    private static final ConfigValue<Integer> pocketTermHeight;
+
+    private static final ConfigValue<Integer> monitorWidth;
+    private static final ConfigValue<Integer> monitorHeight;
+
     private static final ConfigValue<Boolean> genericPeripheral;
 
     private static final ConfigValue<MonitorRenderer> monitorRenderer;
@@ -262,6 +271,28 @@ private Config() {}
             builder.pop();
         }
 
+        {
+            builder.comment( "Configure the size of various computer's terminals.\n" +
+                "Larger terminals require more bandwidth, so use with care." ).push( "term_sizes" );
+
+            builder.comment( "Terminal size of computers" ).push( "computer" );
+            computerTermWidth = builder.defineInRange( "width", ComputerCraft.computerTermWidth, 1, 255 );
+            computerTermHeight = builder.defineInRange( "height", ComputerCraft.computerTermHeight, 1, 255 );
+            builder.pop();
+
+            builder.comment( "Terminal size of pocket computers" ).push( "pocket_computer" );
+            pocketTermWidth = builder.defineInRange( "width", ComputerCraft.pocketTermWidth, 1, 255 );
+            pocketTermHeight = builder.defineInRange( "height", ComputerCraft.pocketTermHeight, 1, 255 );
+            builder.pop();
+
+            builder.comment( "Maximum size of monitors (in blocks)" ).push( "monitor" );
+            monitorWidth = builder.defineInRange( "width", ComputerCraft.monitorWidth, 1, 32 );
+            monitorHeight = builder.defineInRange( "height", ComputerCraft.monitorHeight, 1, 32 );
+            builder.pop();
+
+            builder.pop();
+        }
+
         {
             builder.comment( "Options for various experimental features. These are not guaranteed to be stable, and may change or be removed across versions." );
             builder.push( "experimental" );
@@ -335,6 +366,15 @@ public static void sync()
         ComputerCraft.turtleDisabledActions.clear();
         for( String value : turtleDisabledActions.get() ) ComputerCraft.turtleDisabledActions.add( getAction( value ) );
 
+        // Terminal size
+        ComputerCraft.computerTermWidth = computerTermWidth.get();
+        ComputerCraft.computerTermHeight = computerTermHeight.get();
+        ComputerCraft.pocketTermWidth = pocketTermWidth.get();
+        ComputerCraft.pocketTermHeight = pocketTermHeight.get();
+        ComputerCraft.monitorWidth = monitorWidth.get();
+        ComputerCraft.monitorHeight = monitorHeight.get();
+
+        // Experimental
         ComputerCraft.genericPeripheral = genericPeripheral.get();
 
         // Client
diff --git a/src/main/java/dan200/computercraft/shared/computer/blocks/TileComputer.java b/src/main/java/dan200/computercraft/shared/computer/blocks/TileComputer.java
index 82d10dea2..e03862b3f 100644
--- a/src/main/java/dan200/computercraft/shared/computer/blocks/TileComputer.java
+++ b/src/main/java/dan200/computercraft/shared/computer/blocks/TileComputer.java
@@ -43,8 +43,8 @@ protected ServerComputer createComputer( int instanceID, int id )
         ComputerFamily family = getFamily();
         ServerComputer computer = new ServerComputer(
             getWorld(), id, label, instanceID, family,
-            ComputerCraft.terminalWidth_computer,
-            ComputerCraft.terminalHeight_computer
+            ComputerCraft.computerTermWidth,
+            ComputerCraft.computerTermHeight
         );
         computer.setPosition( getPos() );
         return computer;
diff --git a/src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java b/src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java
index 92603cae8..129f5f783 100644
--- a/src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java
+++ b/src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java
@@ -41,9 +41,6 @@ public class TileMonitor extends TileGeneric
     public static final double RENDER_MARGIN = 0.5 / 16.0;
     public static final double RENDER_PIXEL_SCALE = 1.0 / 64.0;
 
-    private static final int MAX_WIDTH = 8;
-    private static final int MAX_HEIGHT = 6;
-
     private static final String NBT_X = "XIndex";
     private static final String NBT_Y = "YIndex";
     private static final String NBT_WIDTH = "Width";
@@ -473,7 +470,7 @@ private boolean mergeLeft()
         if( left == null || left.m_yIndex != 0 || left.m_height != m_height ) return false;
 
         int width = left.m_width + m_width;
-        if( width > MAX_WIDTH ) return false;
+        if( width > ComputerCraft.monitorWidth ) return false;
 
         TileMonitor origin = left.getOrigin();
         if( origin != null ) origin.resize( width, m_height );
@@ -487,7 +484,7 @@ private boolean mergeRight()
         if( right == null || right.m_yIndex != 0 || right.m_height != m_height ) return false;
 
         int width = m_width + right.m_width;
-        if( width > MAX_WIDTH ) return false;
+        if( width > ComputerCraft.monitorWidth ) return false;
 
         TileMonitor origin = getOrigin();
         if( origin != null ) origin.resize( width, m_height );
@@ -501,7 +498,7 @@ private boolean mergeUp()
         if( above == null || above.m_xIndex != 0 || above.m_width != m_width ) return false;
 
         int height = above.m_height + m_height;
-        if( height > MAX_HEIGHT ) return false;
+        if( height > ComputerCraft.monitorHeight ) return false;
 
         TileMonitor origin = getOrigin();
         if( origin != null ) origin.resize( m_width, height );
@@ -515,7 +512,7 @@ private boolean mergeDown()
         if( below == null || below.m_xIndex != 0 || below.m_width != m_width ) return false;
 
         int height = m_height + below.m_height;
-        if( height > MAX_HEIGHT ) return false;
+        if( height > ComputerCraft.monitorHeight ) return false;
 
         TileMonitor origin = below.getOrigin();
         if( origin != null ) origin.resize( m_width, height );
diff --git a/src/main/java/dan200/computercraft/shared/pocket/core/PocketServerComputer.java b/src/main/java/dan200/computercraft/shared/pocket/core/PocketServerComputer.java
index df671793b..e165daf95 100644
--- a/src/main/java/dan200/computercraft/shared/pocket/core/PocketServerComputer.java
+++ b/src/main/java/dan200/computercraft/shared/pocket/core/PocketServerComputer.java
@@ -41,7 +41,7 @@ public class PocketServerComputer extends ServerComputer implements IPocketAcces
 
     public PocketServerComputer( World world, int computerID, String label, int instanceID, ComputerFamily family )
     {
-        super( world, computerID, label, instanceID, family, ComputerCraft.terminalWidth_pocketComputer, ComputerCraft.terminalHeight_pocketComputer );
+        super( world, computerID, label, instanceID, family, ComputerCraft.pocketTermWidth, ComputerCraft.pocketTermHeight );
     }
 
     @Nullable
diff --git a/src/main/java/dan200/computercraft/shared/turtle/blocks/TileTurtle.java b/src/main/java/dan200/computercraft/shared/turtle/blocks/TileTurtle.java
index bb7feed4a..2d52d0ef9 100644
--- a/src/main/java/dan200/computercraft/shared/turtle/blocks/TileTurtle.java
+++ b/src/main/java/dan200/computercraft/shared/turtle/blocks/TileTurtle.java
@@ -87,7 +87,7 @@ protected ServerComputer createComputer( int instanceID, int id )
     {
         ServerComputer computer = new ServerComputer(
             getWorld(), id, label, instanceID, getFamily(),
-            ComputerCraft.terminalWidth_turtle, ComputerCraft.terminalHeight_turtle
+            ComputerCraft.turtleTermWidth, ComputerCraft.turtleTermHeight
         );
         computer.setPosition( getPos() );
         computer.addAPI( new TurtleAPI( computer.getAPIEnvironment(), getAccess() ) );
diff --git a/src/test/java/dan200/computercraft/core/computer/ComputerBootstrap.java b/src/test/java/dan200/computercraft/core/computer/ComputerBootstrap.java
index 21b55613b..3675c14d2 100644
--- a/src/test/java/dan200/computercraft/core/computer/ComputerBootstrap.java
+++ b/src/test/java/dan200/computercraft/core/computer/ComputerBootstrap.java
@@ -45,7 +45,7 @@ public static void run( IWritableMount mount, Consumer<Computer> setup, int maxT
         ComputerCraft.logComputerErrors = true;
         ComputerCraft.maxMainComputerTime = ComputerCraft.maxMainGlobalTime = Integer.MAX_VALUE;
 
-        Terminal term = new Terminal( ComputerCraft.terminalWidth_computer, ComputerCraft.terminalHeight_computer );
+        Terminal term = new Terminal( ComputerCraft.computerTermWidth, ComputerCraft.computerTermHeight );
         final Computer computer = new Computer( new BasicEnvironment( mount ), term, 0 );
 
         AssertApi api = new AssertApi();