goldstar.cpp: Added nfb96 conditional DIP switches for payout rate / difficulty display (DSW1) (#14661)

Implemented conditional nfb96 DIP switches behavior for DSW1 based on DSW4:2.
When "Show In Confirm Screen" (DSW4:2) is set to Percentage, DSW1 now
displays payout rate values (55%–90%). When set to Level of Difficulty,
DSW1 instead displays levels (1–8). Both sets of options use the same
bitmask (0x07) and are filtered through PORT_CONDITION to match the
hardware behavior.

Author: jbtx77gr

src/mame/igs/goldstar.cpp

@@ -11302,15 +11302,25 @@ static INPUT_PORTS_START( nfb96 )
 	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_GAMBLE_BOOK ) PORT_NAME("Stats")
 
 	PORT_START("DSW1")
-	PORT_DIPNAME( 0x07, 0x03, "Game Level (Difficulty)" )   PORT_DIPLOCATION("DSW1:!1,!2,!3")  // OK
-	PORT_DIPSETTING(    0x07, "Level 1 (Easiest)" )
-	PORT_DIPSETTING(    0x06, "Level 2" )
-	PORT_DIPSETTING(    0x05, "Level 3" )
-	PORT_DIPSETTING(    0x04, "Level 4" )
-	PORT_DIPSETTING(    0x03, "Level 5" )
-	PORT_DIPSETTING(    0x02, "Level 6" )
-	PORT_DIPSETTING(    0x01, "Level 7" )
-	PORT_DIPSETTING(    0x00, "Level 8 (Hardest)" )
+	PORT_DIPNAME( 0x07, 0x03, "Main Game Pay Rate" ) PORT_DIPLOCATION("DSW1:!1,!2,!3") PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x00, "55%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x01, "60%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x02, "65%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x03, "70%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x04, "75%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x05, "80%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x06, "85%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)
+	PORT_DIPSETTING( 0x07, "90%" ) PORT_CONDITION("DSW4", 0x02, EQUALS, 0x02)	
+	// --- Show Difficulty Levels (DSW4:2 = 0) ---
+	PORT_DIPNAME( 0x07, 0x03, "Game Level (Difficulty)" ) PORT_DIPLOCATION("DSW1:!1,!2,!3") PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x00, "Level 8" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x01, "Level 7" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x02, "Level 6" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x03, "Level 5" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x04, "Level 4" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x05, "Level 3" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x06, "Level 2" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
+	PORT_DIPSETTING( 0x07, "Level 1" ) PORT_CONDITION("DSW4", 0x02, NOTEQUALS, 0x02)
 	PORT_DIPNAME( 0x38, 0x38, "Maximum Play" )              PORT_DIPLOCATION("DSW1:!4,!5,!6")  // OK
 	PORT_DIPSETTING(    0x00, "10" )    PORT_CONDITION("DSW5", 0x10, EQUALS, 0x00)
 	PORT_DIPSETTING(    0x08, "20" )    PORT_CONDITION("DSW5", 0x10, EQUALS, 0x00)