Add a skeleton for Bullion 2, a slot machine from Inder (#12813)

New systems marked not working
------------------------------
Bullion 2 [Victor Fernandez (City Game), Recreativas.org]

Author: clawgrip

src/mame/mame.lst

@@ -41991,6 +41991,9 @@ bp1200                          // (c) 1991 BP Microsystems
 @source:skeleton/br8641.cpp
 br8641                          //
 
+@source:skeleton/bullion2.cpp
+bullion2                        // (c) 1984 Inder
+
 @source:skeleton/busicom.cpp
 busicom                         //
 

src/mame/skeleton/bullion2.cpp

@@ -0,0 +1,127 @@
+// license:BSD-3-Clause
+// copyright-holders:
+
+/*
+  Skeleton driver for Inder "Bullion 2" slot machine.
+  The hardware for Bullion 3 (undumped) is almost the same, the main difference is that Bullion 2 has three reels,
+  and Bullion 3 has four.
+
+  Reels sequence for Bullion 2:
+
+      +--------+--------+--------+
+      |  BAR   |  BELL  | GRAPE  | <- Default after reset
+      +--------+--------+--------+
+      | MELON  | CHERRY |  PLUM  |
+      +--------+--------+--------+
+      | GRAPE  | CHERRY | MELON  |
+      +--------+--------+--------+
+      |  BELL  | BANANA | LEMON  |
+      +--------+--------+--------+
+      |  PLUM  | GRAPE  | CHERRY |
+      +--------+--------+--------+
+      | BANANA |  BAR   |  BELL  |
+      +--------+--------+--------+
+      | LEMON  | LEMON  |  BAR   |
+      +--------+--------+--------+
+      | CHERRY |  PLUM  | BANANA |
+      +--------+--------+--------+
+
+  Dip switches for Bullion 2:
+
+      DIP1 -> |ON |HOPPER| default ON
+      DIP2 |  |OFF|PULSES|
+      DIP3 | 
+      DIP4 |     |ON |DEMO SOUND   | default ON
+      DIP5 |  /->|OFF|NO DEMO SOUND|
+      DIP6 --/ 
+      DIP7 --> |OFF    |OFF    |ON     |ON     | default ON
+      DIP8 --> |OFF    |ON     |OFF    |ON     | default ON
+               |LONGER |LONG   |SHORT  |SHORTER|
+               |      REELS SPINNING TIME      |
+
+  Dip switches 2, 3, 4, 5 unused (default ON).
+
+  Also, you can change the plug on the percentages PCB to change the payments:
+      Plug A = 78%
+      Plug B = 80% default
+      Plug C = 82%
+      Plug D = 84%
+  
+  Complete manual (for both Bullion 2 and Bullion 3) with schematics and dip switches can be downloaded from:
+      https://www.recreativas.org/manuales/tragaperras
+*/
+
+#include "emu.h"
+#include "cpu/z80/z80.h"
+#include "sound/sn76496.h"
+#include "speaker.h"
+
+
+namespace {
+
+class bullion2_state : public driver_device
+{
+public:
+	bullion2_state(const machine_config &mconfig, device_type type, const char *tag) :
+		driver_device(mconfig, type, tag),
+		m_maincpu(*this, "maincpu"), 
+		m_sn(*this, "sn76489")
+	{ }
+
+	void bullion2(machine_config &config);
+
+protected:
+	virtual void machine_start() override;
+	virtual void machine_reset() override;
+
+	required_device<cpu_device> m_maincpu;
+	required_device<sn76489_device> m_sn;
+};
+
+void bullion2_state::machine_start()
+{
+}
+
+void bullion2_state::machine_reset()
+{
+}
+
+static INPUT_PORTS_START( bullion2 )
+	PORT_START("DSW0")
+	PORT_DIPUNKNOWN_DIPLOC(0x01, 0x01, "SW0:1")
+	PORT_DIPUNKNOWN_DIPLOC(0x02, 0x02, "SW0:2")
+	PORT_DIPUNKNOWN_DIPLOC(0x04, 0x04, "SW0:3")
+	PORT_DIPUNKNOWN_DIPLOC(0x08, 0x08, "SW0:4")
+	PORT_DIPUNKNOWN_DIPLOC(0x10, 0x10, "SW0:5")
+	PORT_DIPUNKNOWN_DIPLOC(0x20, 0x20, "SW0:6")
+	PORT_DIPUNKNOWN_DIPLOC(0x40, 0x40, "SW0:7")
+	PORT_DIPUNKNOWN_DIPLOC(0x80, 0x80, "SW0:8")
+INPUT_PORTS_END
+
+void bullion2_state::bullion2(machine_config &config)
+{
+	// CPU PCB Inder "60-977"
+
+	Z80( config, m_maincpu, 4_MHz_XTAL ); // NEC D780C
+
+	// Sound PCB Inder "60-083"
+
+	SPEAKER( config, "mono" ).front_center();
+
+	SN76489( config, m_sn, 4_MHz_XTAL );
+	m_sn->add_route( ALL_OUTPUTS, "mono", 1.0 );
+}
+
+ROM_START( bullion2 )
+	ROM_REGION( 0x3000, "maincpu", 0 )
+	ROM_LOAD( "inder_sa_m-17_bullion_2_rom_0_020584.ci19", 0x0000, 0x1000, CRC(fb13407c) SHA1(16a3cdcbe87f17c4bb6a78a8ac47f58d25a4483f) )
+	ROM_LOAD( "inder_sa_m-17_bullion_2_rom_1_020584.ci20", 0x1000, 0x1000, CRC(4857aa2d) SHA1(4f80fde62ce0d0f85df009ac5c1021263049b95a) )
+	ROM_LOAD( "inder_sa_m-17_bullion_2_rom_2_020584.ci21", 0x2000, 0x1000, CRC(2f607456) SHA1(a52ad5e8aeeb7e67ff07569377f19de46ee185ea) )
+ROM_END
+
+
+} // anonymous namespace
+
+
+//    YEAR  NAME      PARENT  MACHINE   INPUT     CLASS           INIT        ROTATION  COMPANY  FULLNAME     FLAGS
+GAME( 1984, bullion2, 0,      bullion2, bullion2, bullion2_state, empty_init, ROT0,     "Inder", "Bullion 2", MACHINE_IS_SKELETON )