diff --git a/bochs/config.h.in b/bochs/config.h.in
index 8af6aa76e..f3649115f 100644
--- a/bochs/config.h.in
+++ b/bochs/config.h.in
@@ -240,7 +240,7 @@
 // is sent to the console.  Reading from port 0xe9
 // will return 0xe9 to let you know this is available.
 // Leave this 0 unless you have a reason to use it.
-#define BX_PORT_E9_HACK 0
+#define BX_PORT_E9_HACK 1
 
 // This option enables "split hard drive" support, which means
 // that a series of partial hard disk images can be treated
@@ -546,4 +546,7 @@ typedef unsigned int Boolean;
 #define BX_ETH_NULL_LOGGING 1
 #define BX_ETH_FBSD_LOGGING 1
 
+// I/O Interface to debug
+#define BX_IODEBUG_SUPPORT 0
+
 #endif  // _BX_CONFIG_H