diff --git a/src/mame/drivers/silvmil.c b/src/mame/drivers/silvmil.c
index 5ea7b46a98f..602a0905d9d 100644
--- a/src/mame/drivers/silvmil.c
+++ b/src/mame/drivers/silvmil.c
@@ -287,37 +287,21 @@ static INPUT_PORTS_START( puzzlove )
 	PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_COIN2 )
 	PORT_BIT( 0xfc00, IP_ACTIVE_LOW, IPT_UNKNOWN )
 
-	PORT_START("DSW")
-	PORT_DIPNAME( 0x0001, 0x0001, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:1")
-	PORT_DIPSETTING(      0x0001, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0002, 0x0002, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:2")
-	PORT_DIPSETTING(      0x0002, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0004, 0x0004, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:3")
-	PORT_DIPSETTING(      0x0004, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0008, 0x0008, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:4")
-	PORT_DIPSETTING(      0x0008, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0010, 0x0010, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:5")
-	PORT_DIPSETTING(      0x0010, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0020, 0x0020, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:6")
-	PORT_DIPSETTING(      0x0020, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0040, 0x0040, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:7")
-	PORT_DIPSETTING(      0x0040, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0080, 0x0080, DEF_STR( Unknown ) )      PORT_DIPLOCATION("SW2:8")
-	PORT_DIPSETTING(      0x0080, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0300, 0x0300, "Game Level" )      PORT_DIPLOCATION("SW1:1,2") /* Difficulty?? - Not sure how this works for Easy --> Very Hard */
-	PORT_DIPSETTING(      0x0300, "1" ) /* Initial start time 40 secs */
-	PORT_DIPSETTING(      0x0200, "2" ) /* Initial start time 30 secs - Other in game effects?? */
-	PORT_DIPSETTING(      0x0100, "3" ) /* Initial start time 30 secs - Other in game effects?? */
-	PORT_DIPSETTING(      0x0000, "4" ) /* Initial start time 30 secs - Other in game effects?? */
-	PORT_DIPNAME( 0x1c00, 0x1c00, DEF_STR( Coinage ) )      PORT_DIPLOCATION("SW1:3,4,5")
+	PORT_START("DSW") /* NOTE: In the service mode, the game reports the dipswitch banks in reverse. IE: SW1 is actually SW2 & SW2 is actually SW1 */
+	PORT_DIPUNUSED_DIPLOC( 0x0001, 0x0001, "SW1:1" ) /* Listed as "Unused" */
+	PORT_DIPUNUSED_DIPLOC( 0x0002, 0x0002, "SW1:2" ) /* Listed as "Unused" */
+	PORT_DIPUNUSED_DIPLOC( 0x0004, 0x0004, "SW1:3" ) /* Listed as "Unused" */
+	PORT_DIPUNUSED_DIPLOC( 0x0008, 0x0008, "SW1:4" ) /* Listed as "Unused" */
+	PORT_DIPUNUSED_DIPLOC( 0x0010, 0x0010, "SW1:5" ) /* Listed as "Unused" */
+	PORT_DIPUNUSED_DIPLOC( 0x0020, 0x0020, "SW1:6" ) /* Listed as "Unused" */
+	PORT_DIPUNUSED_DIPLOC( 0x0040, 0x0040, "SW1:7" ) /* Listed as "Unused" */
+	PORT_DIPUNUSED_DIPLOC( 0x0080, 0x0080, "SW1:8" ) /* Listed as "Unused" */
+	PORT_DIPNAME( 0x0300, 0x0100, DEF_STR( Difficulty ) )	PORT_DIPLOCATION("SW2:1,2")
+	PORT_DIPSETTING(      0x0300, DEF_STR( Very_Easy ) )       /* Initial start time 40 secs */
+	PORT_DIPSETTING(      0x0200, DEF_STR( Easy ) )            /* Initial start time 30 secs - Other in game effects?? */
+	PORT_DIPSETTING(      0x0100, DEF_STR( Hard ) )            /* Initial start time 30 secs - Other in game effects?? */
+	PORT_DIPSETTING(      0x0000, DEF_STR( Very_Hard ) )       /* Initial start time 30 secs - Other in game effects?? */
+	PORT_DIPNAME( 0x1c00, 0x1c00, DEF_STR( Coinage ) )	PORT_DIPLOCATION("SW2:3,4,5")
 	PORT_DIPSETTING(      0x1000, DEF_STR( 4C_1C ) )
 	PORT_DIPSETTING(      0x1400, DEF_STR( 3C_1C ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( 4C_2C ) ) /* Works the same as 2C/1C */
@@ -326,13 +310,13 @@ static INPUT_PORTS_START( puzzlove )
 	PORT_DIPSETTING(      0x0800, DEF_STR( 2C_2C ) ) /* Works the same as 1C/1C */
 	PORT_DIPSETTING(      0x1c00, DEF_STR( 1C_1C ) )
 	PORT_DIPSETTING(      0x0c00, DEF_STR( 1C_2C ) )
-	PORT_DIPNAME( 0x2000, 0x2000, "Coin Box" )      PORT_DIPLOCATION("SW1:6") /* Always displays total credits - No separate Credit display per player */
+	PORT_DIPNAME( 0x2000, 0x2000, "Coin Box" )      PORT_DIPLOCATION("SW2:6") /* Always displays total credits - No separate Credit display per player */
 	PORT_DIPSETTING(      0x2000, "1" ) /* Both players use coins from either Coin 1 or Coin 2 */
 	PORT_DIPSETTING(      0x0000, "2" ) /* Players use coins from own coin chute. IE: Player 1 -> Coin 1, Player 2 -> Coin 2 but shows only total credits */
-	PORT_DIPNAME( 0x4000, 0x4000, DEF_STR( Lives ) )      PORT_DIPLOCATION("SW1:7")
+	PORT_DIPNAME( 0x4000, 0x4000, DEF_STR( Lives ) )      PORT_DIPLOCATION("SW2:7")
 	PORT_DIPSETTING(      0x0000, "2" )
 	PORT_DIPSETTING(      0x4000, "3" )
-	PORT_SERVICE_DIPLOC(  0x8000, IP_ACTIVE_LOW, "SW1:8" ) /* Verified */
+	PORT_SERVICE_DIPLOC(  0x8000, IP_ACTIVE_LOW, "SW2:8" ) /* Verified */
 INPUT_PORTS_END