diff --git a/t80/T80pa.vhd b/t80/T80pa.vhd
index ef07433..cb3d146 100644
--- a/t80/T80pa.vhd
+++ b/t80/T80pa.vhd
@@ -65,12 +65,12 @@ entity T80pa is
 	port(
 		RESET_n		: in  std_logic;
 		CLK			: in  std_logic;
-		CEN_p       : in  std_logic;
-		CEN_n       : in  std_logic;
-		WAIT_n		: in  std_logic;
-		INT_n			: in  std_logic;
-		NMI_n			: in  std_logic;
-		BUSRQ_n		: in  std_logic;
+		CEN_p       : in  std_logic := '1';
+		CEN_n       : in  std_logic := '1';
+		WAIT_n		: in  std_logic := '1';
+		INT_n			: in  std_logic := '1';
+		NMI_n			: in  std_logic := '1';
+		BUSRQ_n		: in  std_logic := '1';
 		M1_n			: out std_logic;
 		MREQ_n		: out std_logic;
 		IORQ_n		: out std_logic;