diff --git a/src/mame/drivers/segag80v.c b/src/mame/drivers/segag80v.c
index 791aae52ac2..4bd18b60ce4 100644
--- a/src/mame/drivers/segag80v.c
+++ b/src/mame/drivers/segag80v.c
@@ -715,6 +715,10 @@ static INPUT_PORTS_START( zektor )
 	PORT_DIPSETTING(	0x80, "20000" )
 	PORT_DIPSETTING(	0x40, "30000" )
 
+	PORT_MODIFY("D5D4")
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED )					/* P1.15 */
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )					/* P1.19 */
+	
 	PORT_MODIFY("FC")
 	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_START1 )
 	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_START2 )
@@ -752,6 +756,10 @@ static INPUT_PORTS_START( tacscan )
 	PORT_DIPSETTING(	0x80, "20000" )
 	PORT_DIPSETTING(	0x40, "30000" )
 
+	PORT_MODIFY("D5D4")
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED )					/* P1.15 */
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )					/* P1.19 */
+
 	PORT_MODIFY("FC")
 	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_START1 )
 	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_START2 )
@@ -789,6 +797,11 @@ static INPUT_PORTS_START( startrek )
 	PORT_DIPSETTING(	0x80, "30000" )
 	PORT_DIPSETTING(	0xc0, "40000" )
 
+	PORT_MODIFY("D5D4")
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED )					/* P1.15 */
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )					/* P1.19 */
+
+
 	PORT_MODIFY("FC")
 	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_START1 )
 	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_START2 )