I give up. This is probably more compatible with Intel derived processors

EightBit/IntelProcessor.cs

@@ -71,7 +71,6 @@ namespace EightBit
                 RaisingHALT?.Invoke(this, EventArgs.Empty);
                 this.HALT.Raise();
                 this.PC.Increment();
-                this.PC.Increment();
                 RaisedHALT?.Invoke(this, EventArgs.Empty);
             }
         }