diff --git a/src/mame/drivers/8080bw.c b/src/mame/drivers/8080bw.c
index 262feb4b745..9cadbbd8b30 100644
--- a/src/mame/drivers/8080bw.c
+++ b/src/mame/drivers/8080bw.c
@@ -2789,9 +2789,7 @@ static INPUT_PORTS_START( galactic )
 	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_START2 )
 	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_START1 )
 	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN )
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 )
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_2WAY
-	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_2WAY
+	PORT_BIT( 0x70, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, mw8080bw_state,invaders_in1_control_r, NULL)
 	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )
 
 	PORT_START("IN2")
@@ -2806,13 +2804,17 @@ static INPUT_PORTS_START( galactic )
 	PORT_DIPNAME( 0x08, 0x00, DEF_STR( Lives ) )
 	PORT_DIPSETTING(    0x00, "3" )
 	PORT_DIPSETTING(    0x08, "6" )
-	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(2)
-	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_2WAY PORT_PLAYER(2)
-	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_2WAY PORT_PLAYER(2)
+	PORT_BIT( 0x70, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, mw8080bw_state,invaders_in2_control_r, NULL)
 	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )
 
-	PORT_START(CABINET_PORT_TAG)		/* Dummy port for cocktail mode */
-	PORT_BIT( 0xff, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+	/* Dummy controls port, P1 */
+	INVADERS_CONTROL_PORT_P1
+
+	/* Dummy controls port, P2 */
+	INVADERS_CONTROL_PORT_P2
+
+	/* Dummy port for cocktail mode */
+	INVADERS_CAB_TYPE_PORT
 INPUT_PORTS_END