diff --git a/commands/Addlw.java b/commands/Addlw.java
index 0fe48c6..d74a7a7 100644
--- a/commands/Addlw.java
+++ b/commands/Addlw.java
@@ -18,7 +18,7 @@ public class Addlw extends CommandUtils implements Command
 
         checkZeroBit(result);
         checkCarryBit(result);
-        checkDigitCarryBit(result, literal);
+        checkDigitCarryBit(literal);
 
         Memory.workingRegister = result % 256;
     }
diff --git a/commands/CommandUtils.java b/commands/CommandUtils.java
index 5ded754..645b1fc 100644
--- a/commands/CommandUtils.java
+++ b/commands/CommandUtils.java
@@ -6,7 +6,7 @@ public class CommandUtils
 {
     protected void checkZeroBit(int result)
     {
-        if(result == 0){
+        if((result % 256) == 0){
             Memory.setZeroBit();
         } else{
             Memory.clearZeroBit();
@@ -22,7 +22,7 @@ public class CommandUtils
         }
     }
 
-    protected void checkDigitCarryBit(int result, int literal)
+    protected void checkDigitCarryBit(int literal)
     {
         if(((Memory.workingRegister & 0x0F) + (literal & 0x0F)) > 15){
             Memory.setDigitCarryBit();
diff --git a/commands/Sublw.java b/commands/Sublw.java
new file mode 100644
index 0000000..f229fe5
--- /dev/null
+++ b/commands/Sublw.java
@@ -0,0 +1,45 @@
+package commands;
+
+import registers.Memory;
+
+public class Sublw extends CommandUtils implements Command
+{
+    private final int literal;
+
+    public Sublw(int input)
+    {
+        literal = input & 0x00FF;
+    }
+
+    @Override
+    protected void checkCarryBit(int result)
+    {
+        if(result <= 255){
+            Memory.clearCarryBit();
+        } else{
+            Memory.setCarryBit();
+        }
+    }
+
+    @Override
+    protected void checkDigitCarryBit(int literal)
+    {
+        if(((literal & 0x0F) - (Memory.workingRegister & 0x0F)) < 0){
+            Memory.clearDigitCarryBit();
+        } else{
+            Memory.setDigitCarryBit();
+        }
+    }
+
+    @Override
+    public void execute()
+    {
+        int result = literal - Memory.workingRegister + 256;
+
+        checkZeroBit(result);
+        checkCarryBit(result);
+        checkDigitCarryBit(literal);
+
+        Memory.workingRegister = result % 256;
+    }
+}
diff --git a/decoder/CommandDecoder.java b/decoder/CommandDecoder.java
index 6a30093..0f39c6a 100644
--- a/decoder/CommandDecoder.java
+++ b/decoder/CommandDecoder.java
@@ -95,8 +95,7 @@ public class CommandDecoder
                 return new Addlw(input);
                 //break;
             case 0x3C00:
-                //sublw();
-                break;
+                return new Sublw(input);
         }
 
         switch(input & 0x3800)