diff --git a/src/mame/drivers/segaybd.c b/src/mame/drivers/segaybd.c
index 79547125902..c951ef45324 100644
--- a/src/mame/drivers/segaybd.c
+++ b/src/mame/drivers/segaybd.c
@@ -871,6 +871,13 @@ static INPUT_PORTS_START( gforce2 )
 	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Shoot")
 	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_NAME("Missile")
 
+	PORT_MODIFY("PORTC")
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Floor Switch")
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Beam Sensor 2 / Down Limit")
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Beam Sensor 1 / Up Limit")
+	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Left CCW Limit")
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Right CW Limit")
+
 	PORT_MODIFY("DSW")
 	PORT_DIPNAME( 0x01, 0x00, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SWB:1")
 	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )