diff --git a/src/mame/drivers/grchamp.c b/src/mame/drivers/grchamp.c
index 9e54fbf98ec..5815ed68f2a 100644
--- a/src/mame/drivers/grchamp.c
+++ b/src/mame/drivers/grchamp.c
@@ -604,7 +604,7 @@ static INPUT_PORTS_START( grchamp )
 	//mask,default,type,sensitivity,delta,min,max
 
 	PORT_START("DSWA")
-	PORT_DIPNAME( 0x0f, 0x00, DEF_STR( Coin_A ) )
+	PORT_DIPNAME( 0x0f, 0x00, DEF_STR( Coin_A ) )		PORT_DIPLOCATION("SW1:1,2,3,4")
 	PORT_DIPSETTING(    0x0f, DEF_STR( 9C_1C ) )
 	PORT_DIPSETTING(    0x0e, DEF_STR( 8C_1C ) )
 	PORT_DIPSETTING(    0x0d, DEF_STR( 7C_1C ) )
@@ -621,7 +621,7 @@ static INPUT_PORTS_START( grchamp )
 	PORT_DIPSETTING(    0x05, DEF_STR( 1C_6C ) )
 	PORT_DIPSETTING(    0x06, DEF_STR( 1C_7C ) )
 	PORT_DIPSETTING(    0x07, DEF_STR( 1C_8C ) )
-	PORT_DIPNAME( 0xf0, 0x00, DEF_STR( Coin_B ) )
+	PORT_DIPNAME( 0xf0, 0x00, DEF_STR( Coin_B ) )		PORT_DIPLOCATION("SW1:5,6,7,8")
 	PORT_DIPSETTING(    0xf0, DEF_STR( 9C_1C ) )
 	PORT_DIPSETTING(    0xe0, DEF_STR( 8C_1C ) )
 	PORT_DIPSETTING(    0xd0, DEF_STR( 7C_1C ) )
@@ -640,25 +640,25 @@ static INPUT_PORTS_START( grchamp )
 	PORT_DIPSETTING(    0x70, DEF_STR( 1C_8C ) )
 
 	PORT_START("DSWB")
-	PORT_DIPNAME( 0x03, 0x02, "Extra Race" )
+	PORT_DIPNAME( 0x03, 0x02, "Extra Race" )		PORT_DIPLOCATION("SW2:1,2")
 	PORT_DIPSETTING(    0x00, "4th" )
 	PORT_DIPSETTING(    0x02, "5th" )
 	PORT_DIPSETTING(    0x01, "6th" )
 	PORT_DIPSETTING(    0x03, "7th" )
-	PORT_DIPUNUSED( 0x04, IP_ACTIVE_HIGH )
-	PORT_DIPNAME( 0x08, 0x00, "RAM Test" )
+	PORT_DIPUNUSED_DIPLOC( 0x04, IP_ACTIVE_HIGH, "SW2:3" )	/* Listed as "Unused and should remain in the OFF position" */
+	PORT_DIPNAME( 0x08, 0x00, "RAM Test" )			PORT_DIPLOCATION("SW2:4")
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x08, DEF_STR( On ) )
-	PORT_DIPNAME( 0x10, 0x00, "Coin System" )
+	PORT_DIPNAME( 0x10, 0x00, "Coin System" )		PORT_DIPLOCATION("SW2:5")
 	PORT_DIPSETTING(    0x10, "1 Way" )
 	PORT_DIPSETTING(    0x00, "2 Way" )
-	PORT_DIPNAME( 0x20, 0x00, "Display '1981'" )
+	PORT_DIPNAME( 0x20, 0x00, "Display '1981'" )		PORT_DIPLOCATION("SW2:6")
 	PORT_DIPSETTING(    0x20, DEF_STR( No ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( Yes ) )
-	PORT_DIPNAME( 0x40, 0x40, "Display Score" )
+	PORT_DIPNAME( 0x40, 0x40, "Display Score" )		PORT_DIPLOCATION("SW2:7")
 	PORT_DIPSETTING(    0x00, "LEDs" )
 	PORT_DIPSETTING(    0x40, "On Screen" )
-	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
+	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )		PORT_DIPLOCATION("SW2:8")
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x80, DEF_STR( On ) )
 INPUT_PORTS_END