diff --git a/src/mame/sega/segaufo.cpp b/src/mame/sega/segaufo.cpp
index df14e4a576e55..f78fc58aee3af 100644
--- a/src/mame/sega/segaufo.cpp
+++ b/src/mame/sega/segaufo.cpp
@@ -777,16 +777,16 @@ static INPUT_PORTS_START( ufo21 )
 	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
 
 	PORT_START("DSW1") // coinage
-	PORT_DIPNAME( 0x01, 0x01, "UNK1-01" )
+	PORT_DIPNAME( 0x01, 0x01, "1 coin as 2 PLAY" )
 	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x02, 0x02, "UNK1-02" )
+	PORT_DIPNAME( 0x02, 0x02, "1 coin as 3 PLAY, 2 coins as 6 PLAY, 3 coins as 9 PLAY" )
 	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x04, 0x04, "UNK1-04" )
+	PORT_DIPNAME( 0x04, 0x04, "1 coin as 6 PLAY, 2 coins as 9 PLAY" )
 	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x08, 0x08, "UNK1-08" )
+	PORT_DIPNAME( 0x08, 0x08, "2 coins as 1 PLAY, 3 coins as 2 PLAY" )
 	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
 	PORT_DIPNAME( 0x10, 0x10, "UNK1-10" )
@@ -809,19 +809,19 @@ static INPUT_PORTS_START( ufo21 )
 	PORT_DIPNAME( 0x02, 0x02, "UNK2-02" )
 	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x04, 0x04, "UNK2-04" )
+	PORT_DIPNAME( 0x04, 0x04, "Advertise BGM CHRISTMAS ON" )
 	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x08, 0x08, "UNK2-08 Demo Music On" )
+	PORT_DIPNAME( 0x08, 0x08, "Advertise BGM NORMAL ON" )
 	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x10, 0x10, "UNK2-10" )
+	PORT_DIPNAME( 0x10, 0x10, "TIME ATTACK 1" )
 	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x20, 0x20, "UNK2-20" )
+	PORT_DIPNAME( 0x20, 0x20, "TIME ATTACK 2" )
 	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x40, 0x40, "UNK2-40" )
+	PORT_DIPNAME( 0x40, 0x40, "TIME ATTACK 3" )
 	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
 	PORT_DIPNAME( 0x80, 0x80, "UNK2-80" )