clean up

src/cpu.macro.js

@@ -343,7 +343,7 @@ CPU.prototype.init = function(settings)
 
     this.memory_size = settings.memory_size || 1024 * 1024 * 64;
 
-    this.memory = new Memory(new ArrayBuffer(this.memory_size), this.memory_size); 
+    this.memory = new Memory(this.memory_size);
 
     this.segment_is_null = new Uint8Array(8);
     this.segment_limits = new Uint32Array(8);

src/memory.js

@@ -3,8 +3,10 @@
 /**
  * @constructor
  */
-function Memory(buffer, memory_size)
+function Memory(memory_size)
 {
+    var buffer = new ArrayBuffer(memory_size);
+
     this.mem8 = new Uint8Array(buffer);
     this.mem16 = new Uint16Array(buffer);
     this.mem32s = new Int32Array(buffer);