diff --git a/src/mame/irem/m90.cpp b/src/mame/irem/m90.cpp
index 076c289d1ce..ed32eeae335 100644
--- a/src/mame/irem/m90.cpp
+++ b/src/mame/irem/m90.cpp
@@ -665,13 +665,12 @@ static INPUT_PORTS_START( dicegame )
 	IREM_COINS
 
 	PORT_START("DSW")
-	PORT_DIPNAME( 0x0001, 0x0001, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:1")
-	PORT_DIPSETTING(      0x0001, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0002, 0x0002, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:2")
-	PORT_DIPSETTING(      0x0002, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0004, 0x0004, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:3")
+	PORT_DIPNAME( 0x0003, 0x0003, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW1:1,2")
+	PORT_DIPSETTING(      0x0002, "2" )
+	PORT_DIPSETTING(      0x0003, "3" )
+	PORT_DIPSETTING(      0x0001, "4" )
+	PORT_DIPSETTING(      0x0000, "5" )
+	PORT_DIPNAME( 0x0004, 0x0004, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:3") // 3 and 4 are related to difficulty
 	PORT_DIPSETTING(      0x0004, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
 	PORT_DIPNAME( 0x0008, 0x0008, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:4")
@@ -680,9 +679,9 @@ static INPUT_PORTS_START( dicegame )
 	PORT_DIPNAME( 0x0010, 0x0010, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:5")
 	PORT_DIPSETTING(      0x0010, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0020, 0x0020, DEF_STR( Allow_Continue ) ) PORT_DIPLOCATION("SW1:6")
-	PORT_DIPSETTING(      0x0000, DEF_STR( No ) )
-	PORT_DIPSETTING(      0x0020, DEF_STR( Yes ) )
+	PORT_DIPNAME( 0x0020, 0x0020, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW1:6") // this was previously "allow continue" but it doesn't seem to have that effect
+	PORT_DIPSETTING(      0x0020, DEF_STR( Off ) )
+	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
 	PORT_DIPNAME( 0x0040, 0x0000, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SW1:7")
 	PORT_DIPSETTING(      0x0040, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
@@ -691,12 +690,11 @@ static INPUT_PORTS_START( dicegame )
 	PORT_DIPNAME( 0x0100, 0x0100, DEF_STR( Flip_Screen ) ) PORT_DIPLOCATION("SW2:1")
 	PORT_DIPSETTING(      0x0100, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0200, 0x0200, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW2:2")
-	PORT_DIPSETTING(      0x0200, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0400, 0x0400, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW2:3")
-	PORT_DIPSETTING(      0x0400, DEF_STR( Off ) )
-	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
+	PORT_DIPNAME( 0x0600, 0x0600, DEF_STR( Cabinet ) ) PORT_DIPLOCATION("SW2:2,3")
+	PORT_DIPSETTING(      0x0600, DEF_STR( Cocktail ) )
+	PORT_DIPSETTING(      0x0400, "Upright, single controls" )
+	PORT_DIPSETTING(      0x0200, "Upright, dual controls" )
+	PORT_DIPSETTING(      0x0000, DEF_STR( Cocktail ) )
 	PORT_DIPNAME( 0x0800, 0x0800, "Coin Mode" ) PORT_DIPLOCATION("SW2:4")
 	PORT_DIPSETTING(      0x0800, "1" )
 	PORT_DIPSETTING(      0x0000, "2" )