diff --git a/src/mame/drivers/sub.c b/src/mame/drivers/sub.c
index 0d7738c03fd..e00346f4ce8 100644
--- a/src/mame/drivers/sub.c
+++ b/src/mame/drivers/sub.c
@@ -321,12 +321,12 @@ static INPUT_PORTS_START( sub )
 	PORT_DIPNAME( 0x10, 0x10, DEF_STR( Flip_Screen ) )
 	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
+	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Cabinet ) )
+	PORT_DIPSETTING(    0x20, DEF_STR( Upright ) )	/* Seperate controls for each player */
+	PORT_DIPSETTING(    0x00, DEF_STR( Cocktail ) ) /* Controls via player 1 for both, but need to get x/y screen flip working to fully test */
+	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Demo_Sounds ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
+	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
 	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
 	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )