diff --git a/Core/Io/IO_Bus.cs b/Core/Io/IO_Bus.cs
index 2fc8c1c..b7386d4 100644
--- a/Core/Io/IO_Bus.cs
+++ b/Core/Io/IO_Bus.cs
@@ -97,16 +97,16 @@ namespace Core.Io
             //{
             //    _memory.HandlePaging(0x1FFD, portValue);
             //}
-            //// AY-3-8912 Register Select (Port 0xFFFD)
-            //if ((portAddress & 0xC002) == 0xC000)
-            //{
-            //    AyChip.SelectRegister(portValue);
-            //}
-            //// AY-3-8912 Data Write (Port 0xBFFD)
-            //else if ((portAddress & 0xC002) == 0x8000)
-            //{
-            //    AyChip.WriteRegister(portValue);
-            //}
+            // AY-3-8912 Register Select (Port 0xFFFD)
+            if ((portAddress & 0xC002) == 0xC000)
+            {
+                AyChip.SelectRegister(portValue);
+            }
+            // AY-3-8912 Data Write (Port 0xBFFD)
+            else if ((portAddress & 0xC002) == 0x8000)
+            {
+                AyChip.WriteRegister(portValue);
+            }
         }
     }
 }
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