diff --git a/src/mame/drivers/seabattl.c b/src/mame/drivers/seabattl.c
index 7b3a0aca435..e4b2c9ce6d8 100644
--- a/src/mame/drivers/seabattl.c
+++ b/src/mame/drivers/seabattl.c
@@ -443,14 +443,14 @@ READ8_HANDLER(seabattl_state::input_1e07_r)
 
 static INPUT_PORTS_START( seabattl )
 	PORT_START("IN0")
-	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN ) // must be high or coins don't work
-	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
-	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("TORPEDO")
-	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("MISSILE")
-	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_COIN1 )
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNUSED )
-	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNUSED )
-	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON2 )
+	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_COIN2 )
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
 
 	PORT_START("IN1")
 	PORT_BIT( 0xff, 0x80, IPT_AD_STICK_X ) PORT_MINMAX(0x00,0xff) PORT_SENSITIVITY(20) PORT_KEYDELTA(20) PORT_CENTERDELTA(0) PORT_PLAYER(1)