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diff --git a/src/mame/audio/bally.cpp b/src/mame/audio/bally.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Mike Harris
+/***************************************************************************
+
+ bally.cpp
+
+ Functions to emulate the various Bally pinball sound boards.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "audio/bally.h"
+#include "sound/volt_reg.h"
+
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(BALLY_AS2888, bally_as2888_device, "as2888", "Bally AS2888 Sound Board")
+DEFINE_DEVICE_TYPE(BALLY_AS3022, bally_as3022_device, "as3022", "Bally AS3022 Sound Board")
+DEFINE_DEVICE_TYPE(BALLY_SOUNDS_PLUS, bally_sounds_plus_device, "sounds_plus", "Bally Sounds Plus w/ Vocalizer Board")
+DEFINE_DEVICE_TYPE(BALLY_CHEAP_SQUEAK, bally_cheap_squeak_device, "cheap_squeak", "Bally Cheap Squeak Board")
+
+
+//**************************************************************************
+// AS2888
+//**************************************************************************
+
+static const discrete_mixer_desc as2888_digital_mixer_info =
+{
+ DISC_MIXER_IS_RESISTOR, /* type */
+ {RES_K(33), RES_K(3.9)}, /* r{} */
+ {0, 0, 0, 0}, /* r_node */
+ {0, 0}, /* c{} */
+ 0, /* rI */
+// RES_VOLTAGE_DIVIDER(RES_K(10), RES_R(360)), /* rF */
+ RES_K(10), /* rF */ // not really
+ CAP_U(0.01), /* cF */
+ 0, /* cAmp */
+ 0, /* vRef */
+ 0.00002 /* gain */
+};
+
+static const discrete_op_amp_filt_info as2888_preamp_info = {
+ RES_K(10), 0, RES_R(470), 0, /* r1 .. r4 */
+ RES_K(10), /* rF */
+ CAP_U(1), /* C1 */
+ 0, /* C2 */
+ 0, /* C3 */
+ 0.0, /* vRef */
+ 12.0, /* vP */
+ -12.0, /* vN */
+};
+
+static DISCRETE_SOUND_START(as2888_discrete)
+
+ DISCRETE_INPUT_DATA(NODE_08) // Start Sustain Attenuation from 555 circuit
+ DISCRETE_INPUT_LOGIC(NODE_01) // Binary Counter B output (divide by 1) T2
+ DISCRETE_INPUT_LOGIC(NODE_04) // Binary Counter D output (divide by 4) T3
+
+ DISCRETE_DIVIDE(NODE_11, 1, NODE_01, 1) // 2
+ DISCRETE_DIVIDE(NODE_14, 1, NODE_04, 1)
+
+
+ DISCRETE_RCFILTER(NODE_06, NODE_14, RES_K(15), CAP_U(0.1)) // T4 filter
+#if 0
+ DISCRETE_RCFILTER(NODE_05, NODE_11, RES_K(33), CAP_U(0.01)) // T1 filter
+ DISCRETE_ADDER2(NODE_07, 1, NODE_05, NODE_06)
+#else
+
+ DISCRETE_MIXER2(NODE_07, 1, NODE_11, NODE_06, &as2888_digital_mixer_info) // Mix and filter T1 and T4 together
+#endif
+ DISCRETE_RCDISC5(NODE_87, 1, NODE_08, RES_K(150), CAP_U(1.0))
+
+ DISCRETE_RCFILTER_VREF(NODE_88,NODE_87,RES_M(1),CAP_U(0.01),2)
+ DISCRETE_MULTIPLY(NODE_09, NODE_07, NODE_88) // Apply sustain
+
+ DISCRETE_OP_AMP_FILTER(NODE_20, 1, NODE_09, 0, DISC_OP_AMP_FILTER_IS_HIGH_PASS_1, &as2888_preamp_info)
+
+ DISCRETE_CRFILTER(NODE_25, NODE_20, RES_M(100), CAP_U(0.05)) // Resistor is fake. Capacitor in series between pre-amp and output amp.
+
+ DISCRETE_GAIN(NODE_30, NODE_25, 50) // Output amplifier LM380 fixed inbuilt gain of 50
+
+ DISCRETE_OUTPUT(NODE_30, 10000000) // 17000000
+DISCRETE_SOUND_END
+
+//-------------------------------------------------
+// sound_select - handle an external write to the board
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_as2888_device::sound_select)
+{
+ machine().scheduler().synchronize(timer_expired_delegate(FUNC(bally_as2888_device::sound_select_sync), this), data);
+}
+
+
+TIMER_CALLBACK_MEMBER(bally_as2888_device::sound_select_sync)
+{
+ m_sound_select = param;
+}
+
+//-------------------------------------------------
+//
+// sound_int - handle an external sound interrupt to the board
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER(bally_as2888_device::sound_int)
+{
+ machine().scheduler().synchronize(timer_expired_delegate(FUNC(bally_as2888_device::sound_int_sync), this), state);
+}
+
+TIMER_CALLBACK_MEMBER(bally_as2888_device::sound_int_sync)
+{
+ if (param)
+ {
+ m_snd_sustain_timer->adjust(attotime::from_msec(5));
+ m_discrete->write(NODE_08, 11); // 11 volt pulse
+ }
+}
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void bally_as2888_device::device_add_mconfig(machine_config &config)
+{
+ DISCRETE(config, m_discrete, as2888_discrete);
+ m_discrete->add_route(ALL_OUTPUTS, *this, 1.00, AUTO_ALLOC_INPUT, 0);
+
+ TIMER(config, "timer_s_freq").configure_periodic(FUNC(bally_as2888_device::timer_s), attotime::from_hz(353000)); // Inverter clock on AS-2888 sound board
+ TIMER(config, m_snd_sustain_timer).configure_generic(FUNC(bally_as2888_device::timer_as2888));
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void bally_as2888_device::device_start()
+{
+ save_item(NAME(m_sound_select));
+ save_item(NAME(m_snd_sel));
+ save_item(NAME(m_snd_tone_gen));
+ save_item(NAME(m_snd_div));
+}
+
+TIMER_DEVICE_CALLBACK_MEMBER(bally_as2888_device::timer_s)
+{
+ m_snd_tone_gen--;
+
+ if ((m_snd_tone_gen == 0) && (m_snd_sel != 0x01))
+ {
+ m_snd_tone_gen = m_snd_sel;
+ m_snd_div++;
+
+ m_discrete->write(NODE_04, BIT(m_snd_div, 2) * 1);
+ m_discrete->write(NODE_01, BIT(m_snd_div, 0) * 1);
+ }
+}
+
+TIMER_DEVICE_CALLBACK_MEMBER(bally_as2888_device::timer_as2888)
+{
+ m_snd_sel = m_snd_prom[m_sound_select];
+ m_snd_sel = bitswap<8>(m_snd_sel,0,1,2,3,4,5,6,7);
+ m_snd_tone_gen = m_snd_sel;
+
+ m_discrete->write(NODE_08, 0);
+ m_snd_sustain_timer->adjust(attotime::never);
+}
+
+
+//**************************************************************************
+// AS3022
+//**************************************************************************
+
+//**************************************************************************
+// IO ports
+//**************************************************************************
+static INPUT_PORTS_START(as3022)
+ PORT_START("SW1")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE1 ) PORT_NAME("SW1") PORT_CHANGED_MEMBER(DEVICE_SELF, bally_as3022_device, sw1, 0)
+INPUT_PORTS_END
+
+ioport_constructor bally_as3022_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME(as3022);
+}
+
+INPUT_CHANGED_MEMBER(bally_as3022_device::sw1)
+{
+ if (newval != oldval)
+ m_cpu->set_input_line(INPUT_LINE_NMI, (newval ? ASSERT_LINE : CLEAR_LINE));
+}
+
+//-------------------------------------------------
+// sound_select - handle an external write to the board
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_as3022_device::sound_select)
+{
+ machine().scheduler().synchronize(timer_expired_delegate(FUNC(bally_as3022_device::sound_select_sync), this), data);
+}
+
+
+TIMER_CALLBACK_MEMBER(bally_as3022_device::sound_select_sync)
+{
+ m_sound_select = param;
+}
+
+//-------------------------------------------------
+//
+// sound_int - handle an external sound interrupt to the board
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER(bally_as3022_device::sound_int)
+{
+ machine().scheduler().synchronize(timer_expired_delegate(FUNC(bally_as3022_device::sound_int_sync), this), state);
+}
+
+TIMER_CALLBACK_MEMBER(bally_as3022_device::sound_int_sync)
+{
+ m_pia->ca1_w(param);
+}
+
+
+//-------------------------------------------------
+//
+// irq_w - IRQ line state changes
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER(bally_as3022_device::irq_w)
+{
+ int combined_state = m_pia->irq_a_state() | m_pia->irq_b_state();
+ m_cpu->set_input_line(M6802_IRQ_LINE, combined_state ? ASSERT_LINE : CLEAR_LINE);
+}
+
+
+//-------------------------------------------------
+// CPU map, from schematics
+//-------------------------------------------------
+
+void bally_as3022_device::as3022_map(address_map &map)
+{
+ map.unmap_value_high();
+ map.global_mask(0x1fff); // A13-15 are unconnected
+ map(0x0000, 0x007f).mirror(0x0f00).ram();
+ map(0x0080, 0x0083).mirror(0x0f7c).rw("pia", FUNC(pia6821_device::read), FUNC(pia6821_device::write));
+ map(0x1000, 0x1fff).rom(); // 4k RAM space, but could be jumpered for 2k
+}
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void bally_as3022_device::device_add_mconfig(machine_config &config)
+{
+ M6808(config, m_cpu, DERIVED_CLOCK(1, 1));
+ m_cpu->set_addrmap(AS_PROGRAM, &bally_as3022_device::as3022_map);
+
+ PIA6821(config, m_pia, 0);
+ m_pia->readpa_handler().set(FUNC(bally_as3022_device::pia_porta_r));
+ m_pia->writepa_handler().set(FUNC(bally_as3022_device::pia_porta_w));
+ m_pia->writepb_handler().set(FUNC(bally_as3022_device::pia_portb_w));
+ m_pia->cb2_handler().set(FUNC(bally_as3022_device::pia_cb2_w));
+ m_pia->irqa_handler().set(FUNC(bally_as3022_device::irq_w));
+ m_pia->irqb_handler().set(FUNC(bally_as3022_device::irq_w));
+
+ AY8910(config, m_ay, DERIVED_CLOCK(1, 4));
+ m_ay->port_a_read_callback().set(FUNC(bally_as3022_device::ay_io_r));
+ m_ay->add_route(ALL_OUTPUTS, *this, 0.33, AUTO_ALLOC_INPUT, 0);
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void bally_as3022_device::device_start()
+{
+ // Set volumes to a sane default.
+ m_ay->set_volume(0, 0);
+ m_ay->set_volume(1, 0);
+ m_ay->set_volume(2, 0);
+
+ save_item(NAME(m_bc1));
+ save_item(NAME(m_bdir));
+ save_item(NAME(m_sound_select));
+ save_item(NAME(m_ay_data));
+}
+
+
+//-------------------------------------------------
+// pia_porta_r - PIA port A reads
+//-------------------------------------------------
+
+READ8_MEMBER(bally_as3022_device::pia_porta_r)
+{
+ if (m_bc1 && !m_bdir)
+ {
+ m_ay_data = m_ay->data_r();
+ return m_ay_data;
+ }
+ else
+ {
+ // Nothing is active on the bus, so return open bus.
+ return 0xff;
+ }
+}
+
+
+//-------------------------------------------------
+// pia_porta_w - PIA port A writes
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_as3022_device::pia_porta_w)
+{
+ if (m_bc1 && !m_bdir)
+ {
+ logerror("PIA port A bus contention!\n");
+ }
+ m_ay_data = data;
+ update_sound_selects();
+}
+
+
+//-------------------------------------------------
+// pia_portb_w - PIA port B writes
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_as3022_device::pia_portb_w)
+{
+ m_bc1 = BIT(data, 0);
+ m_bdir = BIT(data, 1);
+ if (m_bc1 && !m_bdir)
+ {
+ m_ay_data = m_ay->data_r();
+ }
+ update_sound_selects();
+}
+
+
+//-------------------------------------------------
+// pia_cb2_w - PIA CB2 writes
+//-------------------------------------------------
+WRITE_LINE_MEMBER(bally_as3022_device::pia_cb2_w)
+{
+ // This pin is hooked up to the amp, and disables sounds when hi
+ if (state)
+ {
+ m_ay->set_volume(0, 0);
+ m_ay->set_volume(1, 0);
+ m_ay->set_volume(2, 0);
+ }
+ else
+ {
+ m_ay->set_volume(0, 0xff);
+ m_ay->set_volume(1, 0xff);
+ m_ay->set_volume(2, 0xff);
+ }
+}
+
+
+//-------------------------------------------------
+// ay_io_r - AY8912 IO A reads (B is unconnected)
+//-------------------------------------------------
+
+READ8_MEMBER(bally_as3022_device::ay_io_r)
+{
+ // The two high bits are unconnected, the others are inverted.
+ return ~m_sound_select & 0x3f;
+}
+
+
+void bally_as3022_device::update_sound_selects()
+{
+ if (m_bc1 && m_bdir)
+ {
+ m_ay->address_w(m_ay_data);
+ }
+ else if (!m_bc1 && m_bdir)
+ {
+ m_ay->data_w(m_ay_data);
+ }
+}
+
+//**************************************************************************
+// SOUNDS PLUS WITH VOCALIZER
+//**************************************************************************
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void bally_sounds_plus_device::device_add_mconfig(machine_config &config)
+{
+ bally_as3022_device::device_add_mconfig(config);
+
+ m_cpu->set_addrmap(AS_PROGRAM, &bally_sounds_plus_device::sounds_plus_map);
+ m_pia->writepb_handler().set(FUNC(bally_sounds_plus_device::vocalizer_pia_portb_w));
+
+ MC3417(config, m_mc3417, 0);
+ // A gain of 2.2 is a guess. It sounds about loud enough and doesn't clip.
+ m_mc3417->add_route(ALL_OUTPUTS, *this, 2.2, AUTO_ALLOC_INPUT, 0);
+}
+
+//-------------------------------------------------
+// CPU map, from schematics
+//-------------------------------------------------
+
+void bally_sounds_plus_device::sounds_plus_map(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x0000, 0x007f).mirror(0x7f00).ram();
+ map(0x0080, 0x0083).mirror(0x7f7c).rw("pia", FUNC(pia6821_device::read), FUNC(pia6821_device::write));
+ map(0x8000, 0xffff).rom();
+}
+
+//-------------------------------------------------
+// pia_portb_w - PIA port B writes
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_sounds_plus_device::vocalizer_pia_portb_w)
+{
+ bool speech_clock = BIT(data, 6);
+ bool speech_data = BIT(data, 7);
+ m_mc3417->clock_w(speech_clock ? 1 : 0);
+ m_mc3417->digit_w(speech_data ? 1 : 0);
+ pia_portb_w(space, offset, data);
+}
+
+
+//**************************************************************************
+// Cheap Squeak
+//**************************************************************************
+
+//**************************************************************************
+// IO ports
+//**************************************************************************
+static INPUT_PORTS_START(cheap_squeak)
+ PORT_START("SW1")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SERVICE1 ) PORT_NAME("SW1") PORT_CHANGED_MEMBER(DEVICE_SELF, bally_cheap_squeak_device, sw1, 0)
+INPUT_PORTS_END
+
+ioport_constructor bally_cheap_squeak_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME(cheap_squeak);
+}
+
+INPUT_CHANGED_MEMBER(bally_cheap_squeak_device::sw1)
+{
+ if (newval != oldval)
+ m_cpu->set_input_line(INPUT_LINE_NMI, (newval ? ASSERT_LINE : CLEAR_LINE));
+}
+
+//-------------------------------------------------
+// sound_select - handle an external write to the board
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_cheap_squeak_device::sound_select)
+{
+ machine().scheduler().synchronize(timer_expired_delegate(FUNC(bally_cheap_squeak_device::sound_select_sync), this), data);
+}
+
+TIMER_CALLBACK_MEMBER(bally_cheap_squeak_device::sound_select_sync)
+{
+ m_sound_select = param;
+}
+
+//-------------------------------------------------
+//
+// sound_int - handle an external sound interrupt to the board
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER(bally_cheap_squeak_device::sound_int)
+{
+ machine().scheduler().synchronize(timer_expired_delegate(FUNC(bally_cheap_squeak_device::sound_int_sync), this), state);
+}
+
+TIMER_CALLBACK_MEMBER(bally_cheap_squeak_device::sound_int_sync)
+{
+ m_sound_int = param;
+ m_cpu->set_input_line(M6801_TIN_LINE, (m_sound_int ? ASSERT_LINE : CLEAR_LINE));
+}
+
+//-------------------------------------------------
+// CPU map, from schematics
+//-------------------------------------------------
+
+void bally_cheap_squeak_device::cheap_squeak_map(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x0080, 0x00ff).ram();
+ map(0x8000, 0x9fff).mirror(0x2000).rom();
+ map(0xc000, 0xdfff).mirror(0x2000).rom();
+}
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void bally_cheap_squeak_device::device_add_mconfig(machine_config &config)
+{
+ M6803(config, m_cpu, DERIVED_CLOCK(1, 1));
+ m_cpu->set_addrmap(AS_PROGRAM, &bally_cheap_squeak_device::cheap_squeak_map);
+ m_cpu->out_p1_cb().set(FUNC(bally_cheap_squeak_device::out_p1_cb));
+ m_cpu->in_p2_cb().set(FUNC(bally_cheap_squeak_device::in_p2_cb));
+ m_cpu->out_p2_cb().set(FUNC(bally_cheap_squeak_device::out_p2_cb));
+
+ ZN429E(config, "dac", 0).add_route(ALL_OUTPUTS, *this, 1.00, AUTO_ALLOC_INPUT, 0);
+ voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
+ vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
+ vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void bally_cheap_squeak_device::device_start()
+{
+ m_sound_ack_w_handler.resolve();
+ save_item(NAME(m_sound_select));
+ save_item(NAME(m_sound_int));
+}
+
+//-------------------------------------------------
+// out_p1_cb - IO port 1 write
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_cheap_squeak_device::out_p1_cb)
+{
+ m_dac->write(data);
+}
+
+//-------------------------------------------------
+// in_p2_cb - IO port 2 read
+//-------------------------------------------------
+
+READ8_MEMBER(bally_cheap_squeak_device::in_p2_cb)
+{
+ int sound_int_bit = m_sound_int ? 1 : 0;
+ return 0x40 | (m_sound_select & 0x0f) << 1 | sound_int_bit;
+}
+
+//-------------------------------------------------
+// out_p2_cb - IO port 2 write
+//-------------------------------------------------
+
+WRITE8_MEMBER(bally_cheap_squeak_device::out_p2_cb)
+{
+ bool sound_ack = data & 0x01;
+ if (!m_sound_ack_w_handler.isnull())
+ {
+ m_sound_ack_w_handler(sound_ack);
+ }
+}