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sequential/sixtrak.cpp: Added Rev A as a clone. #14556

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Nov 20, 2025
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sequential/sixtrak.cpp: Added Rev A as a clone. #14556

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1 change: 1 addition & 0 deletions src/mame/mame.lst
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Original file line number Diff line number Diff line change
Expand Up @@ -42742,6 +42742,7 @@ prpht600

@source:sequential/sixtrak.cpp
sixtrak
sixtraka

@source:seta/albazc.cpp
hanaroku
Expand Down
94 changes: 74 additions & 20 deletions src/mame/sequential/sixtrak.cpp
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Expand Up @@ -37,12 +37,10 @@ Each of the 6 voice chips (CEM3394) has 8 CV-controlled parameters:
Known hardware revisions:
- Model 610 Rev A: serial numbers 1-900.
- Model 610 Rev B: serial numbers 901-?.
Contrast sixtrak_rev_a() and sixtrak_rev_b() for the differences. In summary:
* MM5837 noise generator replaced with a transistor-based noise source.
* Improved autotune circuit. U146-2 disconnected from U148-5, and connected
to U146-6: the tuning flipflop's D input is connected to the flipflop's
/Q output, instead of being connected to bit 3 of the tuning latch (
port 0x0d). Improves timing accuracy by removing firmware reaction time
from the equation.
* Improved autotune circuit.

- Model 610 Rev C: serial numbers ?-?.
* No known differences.

Expand Down Expand Up @@ -91,8 +89,10 @@ For all other functionality, see the owner's manual.
#include "machine/pit8253.h"
#include "machine/rescap.h"
#include "sound/cem3394.h"
#include "sound/flt_rc.h"
#include "sound/flt_vol.h"
#include "sound/mixer.h"
#include "sound/mm5837.h"
#include "sound/va_eg.h"
#include "speaker.h"

Expand Down Expand Up @@ -166,7 +166,8 @@ class sixtrak_state : public driver_device
public:
sixtrak_state(const machine_config &mconfig, device_type type, const char *tag) ATTR_COLD;

void sixtrak(machine_config &config) ATTR_COLD;
void sixtrak_rev_a(machine_config &config) ATTR_COLD;
void sixtrak_rev_b(machine_config &config) ATTR_COLD;

DECLARE_INPUT_CHANGED_MEMBER(wheel_moved);
DECLARE_INPUT_CHANGED_MEMBER(master_volume_changed);
Expand Down Expand Up @@ -203,9 +204,12 @@ class sixtrak_state : public driver_device
void memory_map(address_map &map) ATTR_COLD;
void io_map(address_map &map) ATTR_COLD;

void sixtrak_common(machine_config &config, device_sound_interface &noise) ATTR_COLD;

required_device<z80_device> m_maincpu;
required_device<pit8253_device> m_pit;
required_device<ttl7474_device> m_tuning_ff; // U146A
required_device<output_latch_device> m_tune_control; // U148 (CD40174)
required_device_array<cem3394_device, 6> m_voices;
required_device_array<va_rc_eg_device, 6> m_gain_rc;
required_device_array<va_rc_eg_device, 6> m_freq_rc;
Expand Down Expand Up @@ -245,6 +249,7 @@ sixtrak_state::sixtrak_state(const machine_config &mconfig, device_type type, co
, m_maincpu(*this, "maincpu")
, m_pit(*this, "pit")
, m_tuning_ff(*this, "tuningff")
, m_tune_control(*this, "tune_control")
, m_voices(*this, "cem3394_%u", 1U)
, m_gain_rc(*this, "gain_rc_%u", 1U)
, m_freq_rc(*this, "freq_rc_%u", 1U)
Expand Down Expand Up @@ -533,8 +538,6 @@ void sixtrak_state::tuning_counter_out_changed(int state)

void sixtrak_state::tuning_ff_comp_out_changed(int state)
{
m_tuning_ff->d_w(state);

// The autotune implementation on the Six-Trak depends on behavior of the
// 8253 that does not seem to be accurately emulated in pit8253.cpp.
// Specifically, the Six-Trak expects that:
Expand Down Expand Up @@ -764,7 +767,7 @@ void sixtrak_state::io_map(address_map &map)
map(0x0a, 0x0a).mirror(0xf0).w(FUNC(sixtrak_state::dac_high_w));
map(0x0b, 0x0b).mirror(0xf0).w("led_latch_0", FUNC(output_latch_device::write));
map(0x0c, 0x0c).mirror(0xf0).w("led_latch_1", FUNC(output_latch_device::write));
map(0x0d, 0x0d).mirror(0xf0).w("tune_latch", FUNC(output_latch_device::write));
map(0x0d, 0x0d).mirror(0xf0).w(m_tune_control, FUNC(output_latch_device::write));
map(0x0e, 0x0e).mirror(0xf0).w(FUNC(sixtrak_state::voice_select_w));
map(0x0f, 0x0f).mirror(0xf0).w(FUNC(sixtrak_state::param_select_w));
map(0x18, 0x18).mirror(0xe0).w(FUNC(sixtrak_state::digit_w));
Expand Down Expand Up @@ -798,7 +801,7 @@ void sixtrak_state::machine_reset()
update_master_volume();
}

void sixtrak_state::sixtrak(machine_config &config)
void sixtrak_state::sixtrak_common(machine_config &config, device_sound_interface &noise)
{
Z80(config, m_maincpu, 8_MHz_XTAL / 2); // U134 (74LS93), QA.
m_maincpu->set_addrmap(AS_PROGRAM, &sixtrak_state::memory_map);
Expand Down Expand Up @@ -834,13 +837,12 @@ void sixtrak_state::sixtrak(machine_config &config)

config.set_default_layout(layout_sequential_sixtrak);

auto &u148 = OUTPUT_LATCH(config, "tune_latch"); // CD40174
u148.bit_handler<0>().set([this] (int state) { m_mute->set_gain(state ? 1.0 : 0.0); });
u148.bit_handler<1>().set(FUNC(sixtrak_state::tuning_counter_gate_w));
u148.bit_handler<2>().set(m_tuning_ff, FUNC(ttl7474_device::preset_w));
// Bit 3 not connected in Rev B and later.
u148.bit_handler<4>().set(m_tuning_ff, FUNC(ttl7474_device::clear_w));
u148.bit_handler<5>().set("nmiff", FUNC(ttl7474_device::preset_w));
OUTPUT_LATCH(config, m_tune_control); // U148, CD40174
m_tune_control->bit_handler<0>().set([this] (int state) { m_mute->set_gain(state ? 1.0 : 0.0); });
m_tune_control->bit_handler<1>().set(FUNC(sixtrak_state::tuning_counter_gate_w));
m_tune_control->bit_handler<2>().set(m_tuning_ff, FUNC(ttl7474_device::preset_w));
m_tune_control->bit_handler<4>().set(m_tuning_ff, FUNC(ttl7474_device::clear_w));
m_tune_control->bit_handler<5>().set("nmiff", FUNC(ttl7474_device::preset_w));

auto &u102 = OUTPUT_LATCH(config, "led_latch_0"); // 74LS174
u102.bit_handler<0>().set_output("led_track_1").invert();
Expand Down Expand Up @@ -891,8 +893,6 @@ void sixtrak_state::sixtrak(machine_config &config)
constexpr double C_VCO_JITTER[6] = {-0.9781, 0.0426, 0.6231, -0.4256, 0.2138, -0.0607};
constexpr double C_VCO = CAP_U(0.002);

auto &noise = SIXTRAK_TRANSISTOR_NOISE(config, "noise");

for (int i = 0; i < 6; ++i)
{
noise.add_route(0, m_voices[i], 1.0, cem3394_device::AUDIO_INPUT);
Expand Down Expand Up @@ -934,6 +934,39 @@ void sixtrak_state::sixtrak(machine_config &config)
SPEAKER(config, "mono").front_center();
}

void sixtrak_state::sixtrak_rev_a(machine_config &config)
{
// In contrast to the Rev B, the Rev A uses an MM5837 as the noise source.
// Could not find a schematic for Rev A, so using the configuration and
// component values from the Sente voice board, which is based on the
// Six-Trak.

auto &noise = MM5837_STREAM(config, "noise", 0);
// The actual VDD is -6.5. But according to comments on sente6vb.cpp, that
// sounds too low, and it is possible the mapping in mm5837 is wrong. Using
// -8.0 as per sente6vb.cpp.
noise.set_vdd(-8.0);
noise.add_route(ALL_OUTPUTS, "ac_noise", 1.0);

auto &ac_noise = FILTER_RC(config, "ac_noise");
ac_noise.set_rc(filter_rc_device::HIGHPASS, RES_K(68) + RES_K(1), 0, 0, CAP_U(2.2));

sixtrak_common(config, ac_noise);

// On the Rev A, the D input of the tuning flip-flop is controlled by the
// firmware.
m_tune_control->bit_handler<3>().set([this] (int state) { m_tuning_ff->d_w(state); });
}

void sixtrak_state::sixtrak_rev_b(machine_config &config)
{
sixtrak_common(config, SIXTRAK_TRANSISTOR_NOISE(config, "noise"));

// On the Rev B and C, the D input of the tuning flip-flop is attached to
// its /Q output.
m_tuning_ff->comp_output_cb().append([this] (int state) { m_tuning_ff->d_w(state); });
}

DECLARE_INPUT_CHANGED_MEMBER(sixtrak_state::wheel_moved)
{
update_wheel_rc(param);
Expand Down Expand Up @@ -1133,6 +1166,27 @@ ROM_START(sixtrak)
ROMX_LOAD("nvram_b-9.bin", 0x000000, 0x000800, CRC(ea2e2fb9) SHA1(d70bf42adf33b2e9970ffd5f1ef3e57217ce349d), ROM_BIOS(1) | ROM_OPTIONAL)
ROM_END

// Firmware versions V11 and V9 are compatible with both Rev A and Rev B / C of
// the Six-Trak.
ROM_START(sixtraka)
ROM_DEFAULT_BIOS("v11")
ROM_SYSTEM_BIOS(0, "v11", "Six-Trak V11 (1985)") // Last official release.
ROM_SYSTEM_BIOS(1, "v9", "Six-Trak V9")

ROM_REGION(0x4000, "maincpu", 0) // U128 (27128)
ROMX_LOAD("trak-11.bin", 0x000000, 0x004000, CRC(4d361d4f) SHA1(f14d4291c1a6a3e9462ae9786641cef11a9aac9a), ROM_BIOS(0))
ROMX_LOAD("trak-9.bin", 0x000000, 0x004000, CRC(d1e6261c) SHA1(bdad57290c24a9ce02c3a5161f8d12f8f96fc74a), ROM_BIOS(1))

ROM_REGION(0x1000, "nvram_a", ROMREGION_ERASE00)
ROMX_LOAD("nvram_a-11.bin", 0x000000, 0x001000, CRC(e36e5a14) SHA1(e31fc4fb23ddb34374c785233980023e01a4bffa), ROM_BIOS(0) | ROM_OPTIONAL)
ROMX_LOAD("nvram_a-9.bin", 0x000000, 0x001000, CRC(4dac5eea) SHA1(7afd40b7a79ac0d9e8f081766391232354fb7028), ROM_BIOS(1) | ROM_OPTIONAL)

ROM_REGION(0x800, "nvram_b", ROMREGION_ERASE00)
ROMX_LOAD("nvram_b-11.bin", 0x000000, 0x000800, CRC(ea2e2fb9) SHA1(d70bf42adf33b2e9970ffd5f1ef3e57217ce349d), ROM_BIOS(0) | ROM_OPTIONAL)
ROMX_LOAD("nvram_b-9.bin", 0x000000, 0x000800, CRC(ea2e2fb9) SHA1(d70bf42adf33b2e9970ffd5f1ef3e57217ce349d), ROM_BIOS(1) | ROM_OPTIONAL)
ROM_END

} // anonymous namespace

SYST(1984, sixtrak, 0, 0, sixtrak, sixtrak, sixtrak_state, empty_init, "Sequential Circuits", "Six-Trak (Model 610) Rev B/C", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE)
SYST(1984, sixtrak, 0, 0, sixtrak_rev_b, sixtrak, sixtrak_state, empty_init, "Sequential Circuits", "Six-Trak (Model 610) Rev B/C", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE)
SYST(1984, sixtraka, sixtrak, 0, sixtrak_rev_a, sixtrak, sixtrak_state, empty_init, "Sequential Circuits", "Six-Trak (Model 610) Rev A", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE)
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