diff --git a/.gitignore b/.gitignore
index 9fd1df3..b534ce4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,6 @@ Server/Server.iml
 target/*
 Server/Server.iml
 Server/src/main/java/META-INF/MANIFEST.MF
+.settings
+.project
+.classpath
\ No newline at end of file
diff --git a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/Cubot.java b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/Cubot.java
index 8693776..9d573f9 100644
--- a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/Cubot.java	
+++ b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/Cubot.java	
@@ -10,13 +10,11 @@ import org.json.simple.JSONObject;
 
 import java.util.ArrayList;
 
-public class Cubot extends GameObject implements Updatable, ControllableUnit, Programmable {
+public class Cubot extends GameObject implements Updatable, ControllableUnit, Programmable, Attackable {
 
     private static final char MAP_INFO = 0x0080;
     public static final int ID = 1;
 
-    public static int TYPE_ID = 2;
-
     private int hologram = 0;
     private String hologramString = "";
     private HologramMode hologramMode = HologramMode.CLEARED;
@@ -27,11 +25,16 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit, Pr
      * Hit points
      */
     private int hp;
+    private int shield;
+    private int maxShield;
     private int heldItem;
 
     private Action currentAction = Action.IDLE;
     private Action lastAction = Action.IDLE;
 
+    private char currentStatus;
+    private char lastStatus;
+
     private ArrayList<Integer> keyboardBuffer = new ArrayList<>();
 
     private ArrayList<char[]> consoleMessagesBuffer = new ArrayList<>(CONSOLE_BUFFER_MAX_SIZE);
@@ -90,6 +93,10 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit, Pr
 
         lastConsoleMessagesBuffer = new ArrayList<>(consoleMessagesBuffer);
         consoleMessagesBuffer.clear();
+
+        //And the status..
+        lastStatus = currentStatus;
+        currentStatus = 0;
     }
 
     @Override
@@ -102,6 +109,7 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit, Pr
         json.put("direction", getDirection().ordinal());
         json.put("heldItem", heldItem);
         json.put("hp", hp);
+        json.put("shield", shield);
         json.put("action", lastAction.ordinal());
         json.put("holo", hologram);
         json.put("holoStr", hologramString);
@@ -127,6 +135,7 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit, Pr
         dbObject.put("direction", getDirection().ordinal());
         dbObject.put("heldItem", heldItem);
         dbObject.put("hp", hp);
+        dbObject.put("shield", shield);
         dbObject.put("action", lastAction.ordinal());
         dbObject.put("holo", hologram);
         dbObject.put("holoStr", hologramString);
@@ -148,6 +157,8 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit, Pr
         cubot.setX((int) obj.get("x"));
         cubot.setY((int) obj.get("y"));
         cubot.hp = (int) obj.get("hp");
+//        cubot.shield = (int) obj.get("shield");
+//        cubot.maxShield = GameServer.INSTANCE.getConfig().getInt("max_shield");
         cubot.setDirection(Direction.getDirection((int) obj.get("direction")));
         cubot.heldItem = (int) obj.get("heldItem");
         cubot.energy = (int) obj.get("energy");
@@ -240,6 +251,41 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit, Pr
         return maxEnergy;
     }
 
+    public int getShield() {
+        return shield;
+    }
+
+    public void setShield(int shield) {
+        this.shield = shield;
+    }
+
+    public boolean chargeShield(int qty) {
+        qty = Math.min(qty, maxShield - shield);
+        int cost = GameServer.INSTANCE.getConfig().getInt("shield_energy_cost");
+        int energySpent = qty * cost;
+        if(spendEnergy(energySpent)) {
+            shield += qty;
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Damages shield by qty.
+     * 
+     * Return damage that broke through the shield.
+     */
+    public int damageShield(int qty) {
+        int after = shield - qty;
+        if(after < 0) {
+            shield = 0;
+            return -after;
+        }
+        shield = after;
+        return 0;
+    }
+
     @Override
     public Memory getFloppyData() {
 
@@ -305,4 +351,58 @@ public class Cubot extends GameObject implements Updatable, ControllableUnit, Pr
     public void setHologramColor(int hologramColor) {
         this.hologramColor = hologramColor;
     }
+
+    public void addStatus(CubotStatus status) {
+
+        currentStatus |= status.val;
+    }
+
+    public void removeStatus(CubotStatus status) {
+
+        currentStatus &= (~status.val);
+    }
+
+    public char getStatus() {
+        return lastStatus;
+    }
+
+    @Override
+    public void setHealRate(int hp) {
+
+    }
+
+    @Override
+    public int getHp() {
+        return 0;
+    }
+
+    @Override
+    public void setHp(int hp) {
+
+    }
+
+    @Override
+    public int getMaxHp() {
+        return 0;
+    }
+
+    @Override
+    public void setMaxHp(int hp) {
+
+    }
+
+    @Override
+    public void heal(int amount) {
+
+    }
+
+    @Override
+    public void damage(int amount) {
+
+    }
+
+    @Override
+    public boolean onDeadCallback() {
+        return true; //always cancelled
+    }
 }
diff --git a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotCore.java b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotCore.java
new file mode 100644
index 0000000..021dc62
--- /dev/null
+++ b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotCore.java	
@@ -0,0 +1,59 @@
+package net.simon987.cubotplugin;
+
+import com.mongodb.BasicDBObject;
+import com.mongodb.DBObject;
+import net.simon987.server.GameServer;
+import net.simon987.server.assembly.CpuHardware;
+import net.simon987.server.assembly.Status;
+
+public class CubotCore extends CpuHardware {
+
+    public static final int DEFAULT_ADDRESS = 0x000E;
+
+    /**
+     * Hardware ID (Should be unique)
+     */
+    public static final char HWID = 0x000E;
+
+    private static final int CORE_STATUS_POLL = 1;
+    private static final int CORE_HULL_POLL = 2;
+
+    private Cubot cubot;
+
+    public CubotCore(Cubot cubot) {
+        this.cubot = cubot;
+    }
+
+    @Override
+    public void handleInterrupt(Status status) {
+
+        int a = getCpu().getRegisterSet().getRegister("A").getValue();
+
+        if (a == CORE_STATUS_POLL) {
+            getCpu().getRegisterSet().getRegister("B").setValue(cubot.getStatus());
+        } else if (a == CORE_HULL_POLL) {
+            getCpu().getRegisterSet().getRegister("B").setValue(cubot.getHp());
+        }
+    }
+
+    @Override
+    public char getId() {
+        return HWID;
+    }
+
+    @Override
+    public BasicDBObject mongoSerialise() {
+
+        BasicDBObject dbObject = new BasicDBObject();
+
+        dbObject.put("hwid", (int) HWID);
+        dbObject.put("cubot", cubot.getObjectId());
+
+        return dbObject;
+    }
+
+
+    public static CubotCore deserialize(DBObject obj) {
+        return new CubotCore((Cubot) GameServer.INSTANCE.getGameUniverse().getObject((long) obj.get("cubot")));
+    }
+}
diff --git a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotPlugin.java b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotPlugin.java
index abbe674..c4ac143 100644
--- a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotPlugin.java	
+++ b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotPlugin.java	
@@ -60,6 +60,8 @@ public class CubotPlugin extends ServerPlugin implements GameObjectDeserializer,
                 return CubotFloppyDrive.deserialize(obj);
             case CubotComPort.HWID:
                 return CubotComPort.deserialize(obj);
+            case CubotShield.HWID:
+                return CubotShield.deserialize(obj);
         }
 
         return null;
diff --git a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotShield.java b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotShield.java
new file mode 100644
index 0000000..0491b35
--- /dev/null
+++ b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotShield.java	
@@ -0,0 +1,51 @@
+package net.simon987.cubotplugin;
+
+import com.mongodb.BasicDBObject;
+import com.mongodb.DBObject;
+import net.simon987.server.GameServer;
+import net.simon987.server.assembly.CpuHardware;
+import net.simon987.server.assembly.Status;
+
+public class CubotShield extends CpuHardware {
+    static final char HWID = 0x000F;
+
+    private static final int SHIELD_CHARGE = 1;
+    private static final int SHIELD_POLL = 2;
+    private Cubot cubot;
+
+    public CubotShield(Cubot cubot) {
+        this.cubot = cubot;
+    }
+
+    @Override
+    public char getId() {
+        return HWID;
+    }
+
+	@Override
+	public BasicDBObject mongoSerialise() {
+        BasicDBObject dbObject = new BasicDBObject();
+        
+        dbObject.put("hwid", HWID);
+        dbObject.put("cubot", cubot.getObjectId());
+        
+        return dbObject;
+	}
+
+	@Override
+	public void handleInterrupt(Status status) {
+        int a = getCpu().getRegisterSet().getRegister("A").getValue();
+        // b = amount to charge
+        if(a == SHIELD_CHARGE) {
+            int b = getCpu().getRegisterSet().getRegister("B").getValue();
+            cubot.chargeShield(b);
+        } else if (a == SHIELD_POLL) {
+            int shield = cubot.getShield();
+            getCpu().getRegisterSet().getRegister("B").setValue(shield);
+        }
+    }
+    
+    public static CubotShield deserialize(DBObject obj) {
+        return new CubotShield((Cubot) GameServer.INSTANCE.getGameUniverse().getObject((long) obj.get("cubot")));
+    }
+}
\ No newline at end of file
diff --git a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotStatus.java b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotStatus.java
new file mode 100644
index 0000000..bb16666
--- /dev/null
+++ b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotStatus.java	
@@ -0,0 +1,18 @@
+package net.simon987.cubotplugin;
+
+/**
+ * Status of a Cubot (Special buff or debuff)
+ */
+public enum CubotStatus {
+
+    DEFAULT(0),
+    RADIATED(1),
+    DAMAGED(2);
+
+    public char val;
+
+    CubotStatus(int val) {
+        this.val = (char) val;
+    }
+
+}
diff --git a/Server/src/main/java/net/simon987/server/Main.java b/Server/src/main/java/net/simon987/server/Main.java
index 2b93634..cab15d0 100644
--- a/Server/src/main/java/net/simon987/server/Main.java
+++ b/Server/src/main/java/net/simon987/server/Main.java
@@ -9,9 +9,9 @@ import java.net.InetSocketAddress;
 public class Main {
     public static void main(String[] args) {
 
-
-        LogManager.initialize();
         ServerConfiguration config = new ServerConfiguration("config.properties");
+        LogManager.initialize(config);
+
         //Load
         GameServer.INSTANCE.load();
 
diff --git a/Server/src/main/java/net/simon987/server/assembly/CPU.java b/Server/src/main/java/net/simon987/server/assembly/CPU.java
index 873907f..1643ed6 100755
--- a/Server/src/main/java/net/simon987/server/assembly/CPU.java
+++ b/Server/src/main/java/net/simon987/server/assembly/CPU.java
@@ -99,6 +99,8 @@ public class CPU implements MongoSerialisable {
         instructionSet.add(new JoInstruction(this));
         instructionSet.add(new PushfInstruction(this));
         instructionSet.add(new PopfInstruction(this));
+        instructionSet.add(new JnaInstruction(this));
+        instructionSet.add(new JaInstruction(this));
 
         status = new Status();
         memory = new Memory(config.getInt("memory_size"));
diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/JaInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/JaInstruction.java
new file mode 100644
index 0000000..20dca0f
--- /dev/null
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/JaInstruction.java
@@ -0,0 +1,38 @@
+package net.simon987.server.assembly.instruction;
+
+import net.simon987.server.assembly.CPU;
+import net.simon987.server.assembly.Instruction;
+import net.simon987.server.assembly.Status;
+import net.simon987.server.assembly.Target;
+
+/**
+ * Jump if above
+ */
+public class JaInstruction extends Instruction {
+
+    public static final int OPCODE = 46;
+
+    private CPU cpu;
+
+    public JaInstruction(CPU cpu) {
+        super("ja", OPCODE);
+
+        this.cpu = cpu;
+    }
+
+    @Override
+    public Status execute(Target src, int srcIndex, Status status) {
+        if (!status.isCarryFlag() && !status.isZeroFlag()) {
+            cpu.setIp((char) src.get(srcIndex));
+        }
+        return status;
+    }
+
+    @Override
+    public Status execute(int src, Status status) {
+        if (!status.isCarryFlag() && !status.isZeroFlag()) {
+            cpu.setIp((char) src);
+        }
+        return status;
+    }
+}
diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/JnaInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/JnaInstruction.java
new file mode 100644
index 0000000..e143f7e
--- /dev/null
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/JnaInstruction.java
@@ -0,0 +1,38 @@
+package net.simon987.server.assembly.instruction;
+
+import net.simon987.server.assembly.CPU;
+import net.simon987.server.assembly.Instruction;
+import net.simon987.server.assembly.Status;
+import net.simon987.server.assembly.Target;
+
+/**
+ * Jump if not above
+ */
+public class JnaInstruction extends Instruction {
+
+    public static final int OPCODE = 47;
+
+    private CPU cpu;
+
+    public JnaInstruction(CPU cpu) {
+        super("jna", OPCODE);
+
+        this.cpu = cpu;
+    }
+
+    @Override
+    public Status execute(Target src, int srcIndex, Status status) {
+        if (status.isCarryFlag() || status.isZeroFlag()) {
+            cpu.setIp((char) src.get(srcIndex));
+        }
+        return status;
+    }
+
+    @Override
+    public Status execute(int src, Status status) {
+        if (status.isCarryFlag() || status.isZeroFlag()) {
+            cpu.setIp((char) src);
+        }
+        return status;
+    }
+}
\ No newline at end of file
diff --git a/Server/src/main/java/net/simon987/server/game/GameObject.java b/Server/src/main/java/net/simon987/server/game/GameObject.java
index 51426d7..e0530a8 100755
--- a/Server/src/main/java/net/simon987/server/game/GameObject.java
+++ b/Server/src/main/java/net/simon987/server/game/GameObject.java
@@ -254,7 +254,7 @@ public abstract class GameObject implements JSONSerialisable, MongoSerialisable
 
     /**
      * Called before this GameObject is removed from the world - defaults to doing nothing
-     * @return cancelled
+     * @return true if cancelled
      */
     public boolean onDeadCallback() {
         return false;
diff --git a/Server/src/main/java/net/simon987/server/game/World.java b/Server/src/main/java/net/simon987/server/game/World.java
index 0ec02e9..893e688 100644
--- a/Server/src/main/java/net/simon987/server/game/World.java
+++ b/Server/src/main/java/net/simon987/server/game/World.java
@@ -159,6 +159,7 @@ public class World implements MongoSerialisable {
             if (object.isDead()) {
                 if (!object.onDeadCallback()) {
                     removeObject(object);
+                    //LogManager.LOGGER.fine("Removed object " + object + " id: " + object.getObjectId());
                 }
 
             } else if (object instanceof Updatable) {
diff --git a/Server/src/main/java/net/simon987/server/logging/LogManager.java b/Server/src/main/java/net/simon987/server/logging/LogManager.java
index 47b11e3..33cc974 100755
--- a/Server/src/main/java/net/simon987/server/logging/LogManager.java
+++ b/Server/src/main/java/net/simon987/server/logging/LogManager.java
@@ -1,5 +1,7 @@
 package net.simon987.server.logging;
 
+import net.simon987.server.ServerConfiguration;
+
 import java.io.IOException;
 import java.util.logging.*;
 
@@ -16,7 +18,7 @@ public class LogManager {
     /**
      * Initialises the logger
      */
-    public static void initialize() {
+    public static void initialize(ServerConfiguration config) {
         LOGGER.setUseParentHandlers(false);
 
         /*
@@ -45,15 +47,18 @@ public class LogManager {
         handler.setLevel(Level.ALL);
 
         try {
-            Handler fileHandler = new FileHandler("mar.log");
+            Handler fileHandler = new FileHandler("mar-%g.log", config.getInt("log_limit"),
+                    config.getInt("log_count"));
             fileHandler.setLevel(Level.ALL);
             fileHandler.setFormatter(new GenericFormatter());
 
+
             LOGGER.addHandler(handler);
             LOGGER.addHandler(errHandler);
             LOGGER.addHandler(fileHandler);
             LOGGER.setLevel(Level.ALL);
 
+
         } catch (IOException e) {
             e.printStackTrace();
         }
diff --git a/Server/src/main/resources/config.properties b/Server/src/main/resources/config.properties
index ed7e637..5032170 100644
--- a/Server/src/main/resources/config.properties
+++ b/Server/src/main/resources/config.properties
@@ -6,8 +6,8 @@ mysql_pass=mar
 mysql_url=jdbc:mysql://localhost:3306/mar?useSSL=false
 # File management
 save_interval=5
-clean_interval=10
-history_size=10
+log_limit=2000000
+log_count=10
 # Web server port
 webSocket_port=8887
 webSocket_host=0.0.0.0
@@ -49,6 +49,10 @@ maxBiomassRespawnCount=6
 biomassEnergyValue=4000
 # Maximum energy of the battery hardware in kJ
 battery_max_energy=60000
+# Maximum shield power
+max_shield=100
+# Energy cost per unit to charge shield
+shield_energy_cost=50
 # Time for biomass respawn in ticks
 biomassRespawnTime=64
 # Respawn timer will start when biomass count is below this number