diff --git a/src/mess/drivers/supercon.c b/src/mess/drivers/supercon.c
index e406b678b21..9a7914a46dd 100644
--- a/src/mess/drivers/supercon.c
+++ b/src/mess/drivers/supercon.c
@@ -378,14 +378,14 @@ READ8_MEMBER( supercon_state::supercon_port3_r )
 
 	switch ( i )
 	{
-		case 0: m_status_1->read(); break;
-		case 1: m_status_2->read(); break;
-		case 2: m_status_3->read(); break;
-		case 3: m_status_4->read(); break;
-		case 4: m_status_5->read(); break;
-		case 5: m_status_6->read(); break;
-		case 6: m_status_7->read(); break;
-		case 7: m_status_8->read(); break;
+		case 0: key_data=m_status_1->read(); break;
+		case 1: key_data=m_status_2->read(); break;
+		case 2: key_data=m_status_3->read(); break;
+		case 3: key_data=m_status_4->read(); break;
+		case 4: key_data=m_status_5->read(); break;
+		case 5: key_data=m_status_6->read(); break;
+		case 6: key_data=m_status_7->read(); break;
+		case 7: key_data=m_status_8->read(); break;
 	}
 
 	if (key_data != 0xc0)
@@ -444,14 +444,14 @@ READ8_MEMBER( supercon_state::supercon_port4_r )
 
 	switch ( i_18 )
 	{
-		case 0: m_board_1->read(); break;
-		case 1: m_board_2->read(); break;
-		case 2: m_board_3->read(); break;
-		case 3: m_board_4->read(); break;
-		case 4: m_board_5->read(); break;
-		case 5: m_board_6->read(); break;
-		case 6: m_board_7->read(); break;
-		case 7: m_board_8->read(); break;
+		case 0: key_data=m_board_1->read(); break;
+		case 1: key_data=m_board_2->read(); break;
+		case 2: key_data=m_board_3->read(); break;
+		case 3: key_data=m_board_4->read(); break;
+		case 4: key_data=m_board_5->read(); break;
+		case 5: key_data=m_board_6->read(); break;
+		case 6: key_data=m_board_7->read(); break;
+		case 7: key_data=m_board_8->read(); break;
 	}
 
 	if (key_data != 0xff)