diff --git a/src/mame/drivers/timelimt.c b/src/mame/drivers/timelimt.c
index c246308b9f4..decc2f3dad4 100644
--- a/src/mame/drivers/timelimt.c
+++ b/src/mame/drivers/timelimt.c
@@ -141,10 +141,10 @@ static INPUT_PORTS_START( timelimt )
 	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Lives ) )
 	PORT_DIPSETTING(    0x00, "3" )
 	PORT_DIPSETTING(    0x10, "5" )
-	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
+	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )	/* probably bonus */
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x20, DEF_STR( On ) )
-	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
+	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )	/* probably screen-flip */
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
 	PORT_DIPNAME( 0x80, 0x00, "Invincibility (Cheat)")
@@ -186,13 +186,13 @@ static INPUT_PORTS_START( progress )
 	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Lives ) )
 	PORT_DIPSETTING(    0x00, "3" )
 	PORT_DIPSETTING(    0x10, "5" )
-	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
-	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
-	PORT_DIPSETTING(    0x20, DEF_STR( On ) )
-	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
+	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Bonus ) )
+	PORT_DIPSETTING(    0x00, "20,000 & 100,000" )
+	PORT_DIPSETTING(    0x20, "50,000 & 200,000" )
+	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) ) /* Manual shows "SCREEN" Table=On / Upright=Off */
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x40, DEF_STR( On ) )
-	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
+	PORT_DIPNAME( 0x80, 0x00, "Invincibility (Cheat)")
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
 INPUT_PORTS_END