diff --git a/src/mame/drivers/snowbros.c b/src/mame/drivers/snowbros.c
index ef27f21253f..7e212602dee 100644
--- a/src/mame/drivers/snowbros.c
+++ b/src/mame/drivers/snowbros.c
@@ -38,6 +38,7 @@ Toaplan, 1990
   Hyper Pacman addition by David Haywood
    + some bits by Nicola Salmoria
 
+ !!DO NOT TRUST THE SERVICE MODES FOR DIPSWITCH SETTINGS!!
 
 Stephh's notes (hyperpac):
 
@@ -1111,6 +1112,75 @@ static INPUT_PORTS_START( moremore )
 	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNKNOWN )
 INPUT_PORTS_END
 
+static INPUT_PORTS_START( twinkle )
+	PORT_START("DSW1")	/* 500000.w */
+	PORT_DIPNAME( 0x0001, 0x0000, DEF_STR( Demo_Sounds ) )	PORT_DIPLOCATION("SW1:1")
+	PORT_DIPSETTING(      0x0001, DEF_STR( Off ) )
+	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
+	PORT_DIPNAME( 0x000e, 0x000e, DEF_STR( Coinage ) )	PORT_DIPLOCATION("SW1:2,3,4")
+	PORT_DIPSETTING(      0x0000, DEF_STR( 5C_1C ) )
+	PORT_DIPSETTING(      0x0002, DEF_STR( 4C_1C ) )
+	PORT_DIPSETTING(      0x0004, DEF_STR( 3C_1C ) )
+	PORT_DIPSETTING(      0x0006, DEF_STR( 2C_1C ) )
+	PORT_DIPSETTING(      0x000e, DEF_STR( 1C_1C ) )
+	PORT_DIPSETTING(      0x000a, DEF_STR( 2C_3C ) )
+	PORT_DIPSETTING(      0x000c, DEF_STR( 1C_2C ) )
+	PORT_DIPSETTING(      0x0008, DEF_STR( 1C_3C ) )
+	PORT_DIPNAME( 0x0070, 0x0070, DEF_STR( Difficulty ) )	PORT_DIPLOCATION("SW1:5,6,7") // this is what service mode lists, but I don't trust it.
+	PORT_DIPSETTING(      0x0020, "Level 1" )
+	PORT_DIPSETTING(      0x0010, "Level 2" )
+	PORT_DIPSETTING(      0x0000, "Level 3" )
+	PORT_DIPSETTING(      0x0070, "Level 4" )
+	PORT_DIPSETTING(      0x0060, "Level 5" )
+	PORT_DIPSETTING(      0x0050, "Level 6" )
+	PORT_DIPSETTING(      0x0040, "Level 7" )
+	PORT_DIPSETTING(      0x0030, "Level 8" )
+	PORT_SERVICE_DIPLOC(  0x0080, IP_ACTIVE_LOW, "SW1:8" )
+	PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
+	PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
+	PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
+	PORT_BIT( 0x0800, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
+	PORT_BIT( 0x1000, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(1)	// jump
+	PORT_BIT( 0x2000, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_PLAYER(1)	// fire
+	PORT_BIT( 0x4000, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_PLAYER(1)	// test mode only?
+	PORT_BIT( 0x8000, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+
+	PORT_START("DSW2")	/* 500002.w */
+	PORT_DIPNAME( 0x0003, 0x0002, DEF_STR( Lives ) )	PORT_DIPLOCATION("SW2:1,2") // unlisted in service mode
+	PORT_DIPSETTING(      0x0000, "1" )
+	PORT_DIPSETTING(      0x0003, "2" )
+	PORT_DIPSETTING(      0x0002, "3" )
+	PORT_DIPSETTING(      0x0001, "4" )
+	PORT_DIPUNKNOWN_DIPLOC( 0x0004, 0x0000, "SW2:3" )
+	PORT_DIPUNKNOWN_DIPLOC( 0x0008, 0x0000, "SW2:4" )
+	PORT_DIPNAME( 0x0010, 0x0010, "Pellet Animations" )		PORT_DIPLOCATION("SW2:5") // unlisted in service mode
+	PORT_DIPSETTING(      0x0000, DEF_STR( Off ) )
+	PORT_DIPSETTING(      0x0010, DEF_STR( On ) )
+	PORT_DIPUNKNOWN_DIPLOC( 0x0020, 0x0000, "SW2:6" )
+	PORT_DIPUNKNOWN_DIPLOC( 0x0040, 0x0000, "SW2:7" )
+	PORT_DIPNAME( 0x0080, 0x0080, DEF_STR( Free_Play ) )	PORT_DIPLOCATION("SW2:8")
+	PORT_DIPSETTING(      0x0080, DEF_STR( Off ) )
+	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
+	PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
+	PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
+	PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
+	PORT_BIT( 0x0800, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
+	PORT_BIT( 0x1000, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(2)	// jump
+	PORT_BIT( 0x2000, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_PLAYER(2)	// fire
+	PORT_BIT( 0x4000, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_PLAYER(2)	// test mode only?
+	PORT_BIT( 0x8000, IP_ACTIVE_HIGH, IPT_UNKNOWN )
+
+	PORT_START("SYSTEM")	/* 500004.w */
+	PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_START1 )
+	PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_START2 )
+	PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_COIN1 )
+	PORT_BIT( 0x0800, IP_ACTIVE_HIGH, IPT_COIN2 )
+	PORT_BIT( 0x1000, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNKNOWN )
+INPUT_PORTS_END
+
 // don't trust the test mode! <-- Verified via actual game play: Demo Sounds, Coinage & Free Play
 static INPUT_PORTS_START( pzlbreak )
 	PORT_START("DSW1")	/* 500000.w */
@@ -2740,7 +2810,7 @@ GAME( 1996, cookbib2, 0,        semiprot, cookbib2, cookbib2, ROT0, "SemiCom", "
 GAME( 1996, toppyrap, 0,        semiprot, toppyrap, 0,        ROT0, "SemiCom", "Toppy & Rappy", 0 )
 GAME( 1997, cookbib3, 0,        semiprot, cookbib3, cookbib3, ROT0, "SemiCom", "Cookie & Bibi 3", 0 )
 GAME( 1997, 3in1semi, 0,        semiprot, moremore, 3in1semi, ROT0, "SemiCom", "XESS - The New Revolution (SemiCom 3-in-1)", 0 )
-GAME( 1997, twinkle,  0,        semiprot, moremore, 0,        ROT0, "SemiCom", "Twinkle", 0 )
+GAME( 1997, twinkle,  0,        semiprot, twinkle,  0,        ROT0, "SemiCom", "Twinkle", 0 )
 GAME( 1997, pzlbreak, 0,        semiprot, pzlbreak, pzlbreak, ROT0, "SemiCom", "Puzzle Break", 0 )
 GAME( 1999, moremore, 0,        semiprot, moremore, moremorp, ROT0, "SemiCom / Exit", "More More", 0 )
 GAME( 1999, moremorp, 0,        semiprot, moremore, moremorp, ROT0, "SemiCom / Exit", "More More Plus", 0 )