diff --git a/class.js b/class.js
index fa11e58..d2788b6 100644
--- a/class.js
+++ b/class.js
@@ -52,7 +52,7 @@ var log = function (msg){
     }
 }
 
-var ClassDefinition = function (file){
+var ClassDefinition = function (file,jvm){
     var dataStream = new DataStream(slurpFile(file)[1]);
     this.magic = dataStream.getU4();
     if (this.magic != 0xCAFEBABE){
@@ -75,7 +75,6 @@ var ClassDefinition = function (file){
     }
     this.interface_count = dataStream.getU2();
     
-    // VER: interfaces refs must be classes
     this.interfaces = [];
     for(var i=0; i<this.interface_count; i++){
         this.interfaces[i] = ConstantPoolRef(dataStream.getU2(), this.constantPool,CONSTANT_Class);
@@ -93,8 +92,72 @@ var ClassDefinition = function (file){
     for(var i=0; i<this.methods_count; i++){
         this.methods[i] = new MethodInfo(dataStream, this.constantPool);
     }
+
+    // Post added info;
+    this.jvm = jvm;
+    this className = this.this_class.name_ref.str.replace(/\//g,".");
 }
 
-function LoadClassFile (x){
-    return new ClassDefinition(x);
-}
\ No newline at end of file
+ClassDefinition.prototype.isInterface = function () {
+    return ACC_INTERFACE & this.access_flags;
+}
+
+ClassDefinition.prototype.isArrayClass = function (){
+    return false;
+}
+
+ClassDefinition.prototype.isAssignable = function (T) {
+    // 2.6.7 Assignment Conversion
+    if (this.isInterface()){
+        if (T.isInterface()){
+            return this.isInterfaceOrSuperInterface(T);
+        }else{
+            return T == this.jvm.java_lang_object;
+        }
+    }else if(this.isArrayClass()){
+        if (T.isInterface()){
+            return (T == this.jvm.java_lang_cloneable || T == this.jvm.java_io_serializable);
+        }else if (T.isArrayClass()){
+            
+        }else{
+            return T == this.jvm.java_lang_object;
+        }
+    }else{
+        if (T.isInterface()){
+            return this.isInterfaceOrSuperInterface(T);
+        }else{
+            return this.isClassOrSuperClass(T);
+        }
+    }
+}
+
+ClassDefinition.prototype.isClassOrSuperClass = function(C){
+    if (this == C){
+        return true;
+    }else{
+        if (this.jvm.java_lang_object == this){
+            return false;
+        }else{
+            this.jvm.classForName(this.super_class.name_ref).isClassOrSuperClass(C);
+        }
+    }
+}
+
+ClassDefinition.prototype.isInterfaceOrSuperInterface = function(I){
+    if (this == I){
+        return true;
+    }else{
+        for(var i; i<this.interface_count; i++){
+            if (this.interfaces[i].isInterfaceOrSuperInterface(I)){
+                return true;
+            }
+        }
+        return false;
+    }
+}
+
+function LoadClassFile (x,jvm){
+    return new ClassDefinition(x,jvm);
+}
+
+
diff --git a/cpu.js b/cpu.js
index d7a1dc9..efc8e0b 100644
--- a/cpu.js
+++ b/cpu.js
@@ -9,37 +9,52 @@ var JVM = function(params,args){
     this.method_area = {};
     this.level = 0;
     this.classpath = params.classes_to_load;
-    this.verifyAndLoadClass = function(classFile){
-        if (!this.method_area[classFile]){
-//            log(">>>>>> " + classFile);
-            var loaded_class = LoadClassFile(classFile);
-            var className = loaded_class.this_class.name_ref.str.replace(/\//g,".");
 
+    this.classForName = function (name){
+        var superClass, loaded_class = this.method_area[name];
+
+        if (!loaded_class){
+            loaded_class = LoadClassFile(name, this);
             this.method_area[className] = loaded_class;
-            var superClass;
-            if(loaded_class.super_class){
-                superClass = canonicalName(loaded_class.super_class.name_ref);
-            }else{
-                superClass = "java.lang.Object";
-            }
-            this.verifyAndLoadClass(superClass);
+            this.verifyAndLoadClass(loaded_class);
             
+            log("[Loaded " + className  + " from runtime/" + classFile + "]");
+        }
+        
+        return loaded_class;
+        
+    }
+    
+    this.verifyAndLoadClass = function(classFile){
+        var superClass;
+        if(loaded_class.super_class){
+            superClass = canonicalName(loaded_class.super_class.name_ref);
+        }else{
+            superClass = "java.lang.Object";
+        }
+        this.classForName(superClass);
+
+            // this doesn't seem right. doing this will cause the entire JRE to be loaded
+            // as soon as you start JVM.
+            
+            /*
             var that = this;
-            
+
             loaded_class.constantPool.each(function(constant){
                 if (constant.name_ref.str.charAt(0) == "[") {
                     return;
                 }
                 that.verifyAndLoadClass(canonicalName(constant.name_ref));    
-            }, CONSTANT_Class);
-            
-            log("[Loaded " + className  + " from runtime/" + classFile + "]");
-        }
+            }, CONSTANT_Class);*/
     };
     
     this.run = function (){
+        this.java_lang_object = this.classForName("java.lang.Object");
+        this.java_lang_cloneable = this.classForName("java.lang.Cloneable");
+        this.java_io_serializable = this.classForName("java.io.Serializable");
+        
         var mainClass = this.args[0];
-        this.verifyAndLoadClass(mainClass);
+        this.classForName(mainClass);
     };
 };
 
@@ -52,4 +67,46 @@ var JVMFrame = function(){
     this.local_variables = [];
     this.operand_stack = [];
     
+}
+
+function JVM_THROWS_NEW(exception){
+    throw "VER: throws new " + exception;
+}
+
+function (frame){
+    var operand_stack = frame.operand_stack;
+    
+    switch(opcode){
+    case 0x32: // aaload
+        var index = operand_stack.pop();
+        var arrayref = operand_stack.pop();
+
+        if (arrayref == NULL){
+            JVM_THROWS_NEW("java.lang.NullPointerException");
+        }
+        if (index >= arrayref.length){
+            JVM_THROWS_NEW("java.lang.ArrayIndexOutOfBoundsException");
+        }
+        operand_stack.push(arrayref.value[index.value]);
+        break;
+
+    case 0x53: // aastore
+        var value = operand_stack.pop();
+        var index = operand_stack.pop();
+        var arrayref = operand_stack.pop();
+        
+        if (arrayref == NULL){
+            JVM_THROWS_NEW("java.lang.NullPointerException");
+        }
+        if (index >= arrayref.length){
+            JVM_THROWS_NEW("java.lang.ArrayIndexOutOfBoundsException");
+        }
+        
+        if (value.ref_of == REF_TYPE_class){
+            if (isSubClass(value.ref_of,arrayref.of));
+        }
+        
+        
+        
+    }
 }
\ No newline at end of file
diff --git a/types.js b/types.js
new file mode 100644
index 0000000..dfcdf96
--- /dev/null
+++ b/types.js
@@ -0,0 +1,39 @@
+
+// Local Variables Types
+var LOC_VAR_boolean       = 0x001;
+var LOC_VAR_byte          = 0x002;
+var LOC_VAR_char          = 0x004;
+var LOC_VAR_short         = 0x008;
+var LOC_VAR_int           = 0x010;
+var LOC_VAR_float         = 0x020;
+var LOC_VAR_reference     = 0x040;
+var LOC_VAR_returnAddress = 0x080;
+var LOC_VAR_long          = 0x100;
+var LOC_VAR_double        = 0x200;
+
+// Reference Types
+var REF_TYPE_class        = 0x1;
+var REF_TYPE_interface    = 0x2;
+var REF_TYPE_array        = 0x4
+
+function makeLocalVar(kind){
+    return {id:kind};
+}
+
+function getRefClass(ref){
+    if (ref.type == REF_TYPE_array){
+        return getArrayClass();
+    }else{
+        return ref.classRef;
+    }
+}
+
+var NULL = makeLocalVar(LOC_VAR_reference);
+
+function isSubClass(refS,refT){
+
+}
+
+function implements(refS,refT){
+
+}
\ No newline at end of file