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diff --git a/src/mame/sigma/r2dtank.cpp b/src/mame/sigma/r2dtank.cpp
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+// license:BSD-3-Clause
+// copyright-holders:David Haywood, Pierpaolo Prazzoli
+/*******************************************************************
+
+R2D Tank (c) 1980 Sigma Ent. Inc.
+
+driver by: David Haywood & Pierpaolo Prazzoli
+
+
+from the readme
+----------------------------------------------------
+Orca board number OVG-17A
+
+r2d1.1c is ROM #1 at board position 1C, and so on.
+
+1 = 2716
+2 = 2732
+3 = 2732
+4 = 2732
+5 = 2716 Sound
+
+CPU = 6809
+other = HD46505SP (6845) (CRT controller)
+other = MB14282(x2)
+other = HD468458SP
+other = MB14282
+other = MB14368
+other = HD6821 (x2) (PIA)
+other = HD46802
+other = M5L8226 (x2)
+RAM = 4116 (x11)
+
+----------------------------------------------------
+
+XTAL values appear to be 3579.545 (X1) and 11.200 (X2).
+
+********************************************************************/
+
+#include "emu.h"
+#include "cpu/m6800/m6800.h"
+#include "cpu/m6809/m6809.h"
+#include "machine/6821pia.h"
+#include "machine/74123.h"
+#include "machine/gen_latch.h"
+#include "machine/nvram.h"
+#include "machine/rescap.h"
+#include "sound/ay8910.h"
+#include "video/mc6845.h"
+#include "emupal.h"
+#include "screen.h"
+#include "speaker.h"
+
+#define LOG_AUDIO_COMM (1U << 1)
+
+#define VERBOSE (0)
+#include "logmacro.h"
+
+
+namespace {
+
+#define MAIN_CPU_MASTER_CLOCK (11.2_MHz_XTAL)
+#define PIXEL_CLOCK (MAIN_CPU_MASTER_CLOCK / 2)
+#define CRTC_CLOCK (MAIN_CPU_MASTER_CLOCK / 16)
+
+class r2dtank_state : public driver_device
+{
+public:
+ r2dtank_state(const machine_config &mconfig, device_type type, const char *tag) :
+ driver_device(mconfig, type, tag),
+ m_videoram(*this, "videoram"),
+ m_colorram(*this, "colorram"),
+ m_maincpu(*this, "maincpu"),
+ m_palette(*this, "palette"),
+ m_audiocpu(*this, "audiocpu"),
+ m_soundlatch(*this, "soundlatch"),
+ m_soundlatch2(*this, "soundlatch2"),
+ m_pia_main(*this, "pia_main"),
+ m_pia_audio(*this, "pia_audio"),
+ m_ay1(*this, "ay1"),
+ m_ay2(*this, "ay2")
+ { }
+
+ void r2dtank(machine_config &config);
+
+protected:
+ virtual void machine_start() override ATTR_COLD;
+
+private:
+ required_shared_ptr<uint8_t> m_videoram;
+ required_shared_ptr<uint8_t> m_colorram;
+ required_device<cpu_device> m_maincpu;
+ required_device<palette_device> m_palette;
+ required_device<cpu_device> m_audiocpu;
+ required_device<generic_latch_8_device> m_soundlatch;
+ required_device<generic_latch_8_device> m_soundlatch2;
+ required_device<pia6821_device> m_pia_main;
+ required_device<pia6821_device> m_pia_audio;
+ required_device<ay8910_device> m_ay1;
+ required_device<ay8910_device> m_ay2;
+
+ uint8_t m_flipscreen = 0;
+ uint8_t m_AY8910_selected = 0;
+
+ uint8_t audio_command_r();
+ void audio_command_w(uint8_t data);
+ uint8_t audio_answer_r();
+ void audio_answer_w(uint8_t data);
+ void main_cpu_irq(int state);
+ void AY8910_select_w(uint8_t data);
+ uint8_t AY8910_port_r();
+ void AY8910_port_w(uint8_t data);
+ void flipscreen_w(int state);
+ void pia_comp_w(offs_t offset, uint8_t data);
+
+ MC6845_UPDATE_ROW(crtc_update_row);
+
+ void r2dtank_audio_map(address_map &map) ATTR_COLD;
+ void r2dtank_main_map(address_map &map) ATTR_COLD;
+};
+
+
+
+/*************************************
+ *
+ * Interrupt generation
+ *
+ *************************************/
+
+void r2dtank_state::main_cpu_irq(int state)
+{
+ int combined_state = m_pia_main->irq_a_state() | m_pia_main->irq_b_state() |
+ m_pia_audio->irq_a_state() | m_pia_audio->irq_b_state();
+
+ m_maincpu->set_input_line(M6809_IRQ_LINE, combined_state ? ASSERT_LINE : CLEAR_LINE);
+}
+
+
+
+/*************************************
+ *
+ * Audio system - CPU 1
+ *
+ *************************************/
+
+uint8_t r2dtank_state::audio_command_r()
+{
+ uint8_t ret = m_soundlatch->read();
+ LOGMASKED(LOG_AUDIO_COMM, "%08X CPU#1 Audio Command Read: %x\n", m_audiocpu->pc(), ret);
+
+ return ret;
+}
+
+
+void r2dtank_state::audio_command_w(uint8_t data)
+{
+ m_soundlatch->write(~data);
+ m_audiocpu->set_input_line(M6802_IRQ_LINE, HOLD_LINE);
+
+ LOGMASKED(LOG_AUDIO_COMM, "%08X CPU#0 Audio Command Write: %x\n", m_maincpu->pc(), data^0xff);
+}
+
+
+uint8_t r2dtank_state::audio_answer_r()
+{
+ uint8_t ret = m_soundlatch2->read();
+ LOGMASKED(LOG_AUDIO_COMM, "%08X CPU#0 Audio Answer Read: %x\n", m_maincpu->pc(), ret);
+
+ return ret;
+}
+
+
+void r2dtank_state::audio_answer_w(uint8_t data)
+{
+ /* HACK - prevents lock-up, but causes game to end some in-between screens prematurely */
+ if (m_audiocpu->pc() == 0xfb12)
+ data = 0x00;
+
+ m_soundlatch2->write(data);
+ m_maincpu->set_input_line(M6809_IRQ_LINE, HOLD_LINE);
+
+ LOGMASKED(LOG_AUDIO_COMM, "%08X CPU#1 Audio Answer Write: %x\n", m_audiocpu->pc(), data);
+}
+
+
+void r2dtank_state::AY8910_select_w(uint8_t data)
+{
+ /* not sure what all the bits mean:
+ D0 - ????? definitely used
+ D1 - not used?
+ D2 - selects ay8910 control or port
+ D3 - selects ay8910 #0
+ D4 - selects ay8910 #1
+ D5-D7 - not used */
+ m_AY8910_selected = data;
+
+ LOGMASKED(LOG_AUDIO_COMM, "%s: CPU#1 AY8910_select_w: %x\n", machine().describe_context(), data);
+}
+
+
+uint8_t r2dtank_state::AY8910_port_r()
+{
+ uint8_t ret = 0;
+
+ if (m_AY8910_selected & 0x08)
+ ret = m_ay1->data_r();
+
+ if (m_AY8910_selected & 0x10)
+ ret = m_ay2->data_r();
+
+ return ret;
+}
+
+
+void r2dtank_state::AY8910_port_w(uint8_t data)
+{
+ if (m_AY8910_selected & 0x08)
+ m_ay1->data_address_w(m_AY8910_selected >> 2, data);
+
+ if (m_AY8910_selected & 0x10)
+ m_ay2->data_address_w(m_AY8910_selected >> 2, data);
+}
+
+
+
+/*************************************
+ *
+ * Machine start
+ *
+ *************************************/
+
+void r2dtank_state::machine_start()
+{
+ /* setup for save states */
+ save_item(NAME(m_flipscreen));
+ save_item(NAME(m_AY8910_selected));
+}
+
+
+
+/*************************************
+ *
+ * Video system
+ *
+ *************************************/
+
+void r2dtank_state::flipscreen_w(int state)
+{
+ m_flipscreen = !state;
+}
+
+
+MC6845_UPDATE_ROW( r2dtank_state::crtc_update_row )
+{
+ uint8_t x = 0;
+
+ for (uint8_t cx = 0; cx < x_count; cx++)
+ {
+ /* the memory is hooked up to the MA, RA lines this way */
+ offs_t offs = ((ma << 3) & 0x1f00) | ((ra << 5) & 0x00e0) | ((ma << 0) & 0x001f);
+
+ if (m_flipscreen)
+ offs = offs ^ 0x1fff;
+
+ uint8_t data = m_videoram[offs];
+ uint8_t fore_color = (m_colorram[offs] >> 5) & 0x07;
+
+ for (int i = 0; i < 8; i++)
+ {
+ uint8_t bit;
+
+ if (m_flipscreen)
+ {
+ bit = data & 0x01;
+ data >>= 1;
+ }
+ else
+ {
+ bit = data & 0x80;
+ data <<= 1;
+ }
+
+ uint8_t const color = bit ? fore_color : 0;
+ bitmap.pix(y, x) = m_palette->pen_color(color);
+
+ x++;
+ }
+
+ ma++;
+ }
+}
+
+
+
+/*************************************
+ *
+ * Memory handlers
+ *
+ *************************************/
+
+void r2dtank_state::pia_comp_w(offs_t offset, uint8_t data)
+{
+ m_pia_main->write(offset, ~data);
+}
+
+
+void r2dtank_state::r2dtank_main_map(address_map &map)
+{
+ map(0x0000, 0x1fff).ram().share("videoram");
+ map(0x2000, 0x3fff).ram();
+ map(0x4000, 0x5fff).ram().share("colorram");
+ map(0x6000, 0x7fff).ram();
+ map(0x8000, 0x8003).r("pia_main", FUNC(pia6821_device::read)).w(FUNC(r2dtank_state::pia_comp_w));
+ map(0x8004, 0x8004).rw(FUNC(r2dtank_state::audio_answer_r), FUNC(r2dtank_state::audio_command_w));
+ map(0xb000, 0xb000).w("crtc", FUNC(mc6845_device::address_w));
+ map(0xb001, 0xb001).w("crtc", FUNC(mc6845_device::register_w));
+ map(0xc000, 0xc007).ram().share("nvram");
+ map(0xc800, 0xffff).rom();
+}
+
+
+void r2dtank_state::r2dtank_audio_map(address_map &map)
+{
+ map(0xd000, 0xd003).rw("pia_audio", FUNC(pia6821_device::read), FUNC(pia6821_device::write));
+ map(0xf000, 0xf000).rw(FUNC(r2dtank_state::audio_command_r), FUNC(r2dtank_state::audio_answer_w));
+ map(0xf800, 0xffff).rom();
+}
+
+
+
+/*************************************
+ *
+ * Port definition
+ *
+ *************************************/
+
+static INPUT_PORTS_START( r2dtank )
+ PORT_START("IN0")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
+ PORT_SERVICE_NO_TOGGLE(0x04, IP_ACTIVE_LOW)
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 )
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START1 )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START2 )
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("74123", FUNC(ttl74123_device::q_r))
+
+ PORT_START("IN1")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_COCKTAIL
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_COCKTAIL
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_COCKTAIL
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_COCKTAIL
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
+
+ PORT_START("DSWA")
+ PORT_DIPNAME( 0x01, 0x01, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x01, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x02, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x04, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( On ) )
+ PORT_DIPNAME( 0x08, 0x08, DEF_STR( Bonus_Life ) )
+ PORT_DIPSETTING( 0x00, "5000" )
+ PORT_DIPSETTING( 0x08, "10000" )
+ PORT_DIPNAME( 0x10, 0x00, DEF_STR( Lives ) )
+ PORT_DIPSETTING( 0x00, "3" )
+ PORT_DIPSETTING( 0x10, "4" )
+ PORT_DIPNAME( 0x20, 0x20, DEF_STR( Cabinet ) )
+ PORT_DIPSETTING( 0x20, DEF_STR( Upright ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Cocktail ) )
+ PORT_DIPNAME( 0xc0, 0x00, DEF_STR( Coinage ) )
+ PORT_DIPSETTING( 0x40, DEF_STR( 2C_1C ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( 1C_1C ) )
+ PORT_DIPSETTING( 0x80, DEF_STR( 1C_2C ) )
+ PORT_DIPSETTING( 0xc0, DEF_STR( Free_Play ) )
+
+ PORT_START("DSWB")
+ PORT_DIPNAME( 0x01, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x01, DEF_STR( On ) )
+ PORT_DIPNAME( 0x02, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x02, DEF_STR( On ) )
+ PORT_DIPNAME( 0x04, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x04, DEF_STR( On ) )
+ PORT_DIPNAME( 0x08, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x08, DEF_STR( On ) )
+ PORT_DIPNAME( 0x10, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x10, DEF_STR( On ) )
+ PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x20, DEF_STR( On ) )
+ PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x40, DEF_STR( On ) )
+ PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
+ PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
+ PORT_DIPSETTING( 0x80, DEF_STR( On ) )
+INPUT_PORTS_END
+
+
+
+/*************************************
+ *
+ * Machine driver
+ *
+ *************************************/
+
+void r2dtank_state::r2dtank(machine_config &config)
+{
+ MC6809(config, m_maincpu, MAIN_CPU_MASTER_CLOCK / 4); // divider guessed
+ m_maincpu->set_addrmap(AS_PROGRAM, &r2dtank_state::r2dtank_main_map);
+
+ M6802(config, m_audiocpu, 3.579545_MHz_XTAL);
+ m_audiocpu->set_addrmap(AS_PROGRAM, &r2dtank_state::r2dtank_audio_map);
+
+ NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
+
+ /* video hardware */
+ screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+ screen.set_raw(PIXEL_CLOCK, 360, 0, 256, 276, 0, 224);
+ screen.set_screen_update("crtc", FUNC(mc6845_device::screen_update));
+
+ PALETTE(config, m_palette, palette_device::BGR_3BIT);
+
+ mc6845_device &crtc(MC6845(config, "crtc", CRTC_CLOCK));
+ crtc.set_screen("screen");
+ crtc.set_show_border_area(false);
+ crtc.set_char_width(8);
+ crtc.set_update_row_callback(FUNC(r2dtank_state::crtc_update_row));
+ crtc.out_de_callback().set("74123", FUNC(ttl74123_device::a_w));
+
+ /* 74LS123: This timer is responsible for delaying the PIA1's port input. */
+ /* This delay ensures that CA1 is only changed in the VBLANK region, but not in HBLANK. */
+ ttl74123_device &ttl74123(TTL74123(config, "74123", 0));
+ ttl74123.set_connection_type(TTL74123_GROUNDED); /* the hook up type */
+ ttl74123.set_resistor_value(RES_K(22)); /* resistor connected to RCext */
+ ttl74123.set_capacitor_value(CAP_U(0.01)); /* capacitor connected to Cext and RCext */
+ ttl74123.set_a_pin_value(1); /* A pin - driven by the CRTC */
+ ttl74123.set_b_pin_value(1); /* B pin - pulled high */
+ ttl74123.set_clear_pin_value(1); /* Clear pin - pulled high */
+ ttl74123.out_cb().set(m_pia_main, FUNC(pia6821_device::ca1_w));
+
+ PIA6821(config, m_pia_main);
+ m_pia_main->readpa_handler().set_ioport("IN0");
+ m_pia_main->readpb_handler().set_ioport("IN1");
+ m_pia_main->cb2_handler().set(FUNC(r2dtank_state::flipscreen_w));
+ m_pia_main->irqa_handler().set(FUNC(r2dtank_state::main_cpu_irq));
+ m_pia_main->irqb_handler().set(FUNC(r2dtank_state::main_cpu_irq));
+
+ PIA6821(config, m_pia_audio);
+ m_pia_audio->readpa_handler().set(FUNC(r2dtank_state::AY8910_port_r));
+ m_pia_audio->writepa_handler().set(FUNC(r2dtank_state::AY8910_port_w));
+ m_pia_audio->writepb_handler().set(FUNC(r2dtank_state::AY8910_select_w));
+ m_pia_audio->irqa_handler().set(FUNC(r2dtank_state::main_cpu_irq));
+ m_pia_audio->irqb_handler().set(FUNC(r2dtank_state::main_cpu_irq));
+
+ /* audio hardware */
+ SPEAKER(config, "mono").front_center();
+
+ GENERIC_LATCH_8(config, m_soundlatch);
+ GENERIC_LATCH_8(config, m_soundlatch2);
+
+ AY8910(config, m_ay1, 3.579545_MHz_XTAL / 4); // probably E clock from MC6802
+ m_ay1->port_a_read_callback().set_ioport("DSWB");
+ m_ay1->add_route(ALL_OUTPUTS, "mono", 0.25);
+
+ AY8910(config, m_ay2, 3.579545_MHz_XTAL / 4);
+ m_ay2->port_a_read_callback().set_ioport("IN1");
+ m_ay2->port_b_read_callback().set_ioport("DSWA");
+ m_ay2->add_route(ALL_OUTPUTS, "mono", 0.25);
+}
+
+
+
+/*************************************
+ *
+ * ROM definition
+ *
+ *************************************/
+
+ROM_START( r2dtank )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "r2d1.1c", 0xc800, 0x0800, CRC(20606a0f) SHA1(9a55e595c7ea332bdc89142338947be8a28a92a3) )
+ ROM_LOAD( "r2d2.1a", 0xd000, 0x1000, CRC(7561c67f) SHA1(cccc7bbd7975db340fe571a4c31c25b41b2563b8) )
+ ROM_LOAD( "r2d3.2c", 0xe000, 0x1000, CRC(fc53c538) SHA1(8f9a2edcf7a2cb2a8ddd084828b52f1bf45f434a) )
+ ROM_LOAD( "r2d4.2a", 0xf000, 0x1000, CRC(56636225) SHA1(dcfc6e29b4c51a45cfbecf6790b7d88b89af433b) )
+
+ ROM_REGION( 0x10000, "audiocpu", 0 )
+ ROM_LOAD( "r2d5.7l", 0xf800, 0x0800, CRC(c49bed15) SHA1(ffa635a65c024c532bb13fb91bbd3e54923e81bf) )
+ROM_END
+
+} // anonymous namespace
+
+
+
+/*************************************
+ *
+ * Game driver
+ *
+ *************************************/
+
+GAME( 1980, r2dtank, 0, r2dtank, r2dtank, r2dtank_state, empty_init, ROT270, "Sigma Enterprises Inc.", "R2D Tank", MACHINE_SUPPORTS_SAVE)