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scyclone: replace speech dac with hc55516

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hap 2025-01-03 22:18:46 +01:00
parent 82466846f8
commit c1fbf8e8a5
1 changed files with 27 additions and 33 deletions
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60
src/mame/taito/scyclone.cpp
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@ -34,14 +34,21 @@
Furthermore, the game seems to set what I believe to be the 'flipscreen' bit for player 2
even when in 'upright' mode, so it's possible this romset was only really made for a
cocktail table?
The speech chip is unknown, it seems like it's some sort of 1-bit delta modulation.
Probably HC55516 or something similar.
SN76477 parameters are unknown, so some sound effects are missing.
*/
#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/clock.h"
#include "machine/gen_latch.h"
#include "machine/mb14241.h"
#include "sound/dac.h"
#include "sound/hc55516.h"
#include "sound/sn76477.h"
#include "emupal.h"
@ -64,7 +71,8 @@ public:
m_screen(*this, "screen"),
m_palette(*this, "palette"),
m_snsnd(*this, "snsnd%u", 0),
m_dac(*this, "dac%u", 0),
m_cvsd(*this, "cvsd"),
m_cvsd_clock(*this, "cvsd_clock"),
m_soundlatch(*this, "soundlatch")
{ }
@ -86,7 +94,8 @@ private:
required_device<screen_device> m_screen;
required_device<palette_device> m_palette;
required_device_array<sn76477_device, 2> m_snsnd;
required_device_array<dac_byte_interface, 2> m_dac;
required_device<hc55516_device> m_cvsd;
required_device<clock_device> m_cvsd_clock;
required_device<generic_latch_8_device> m_soundlatch;
void scyclone_iomap(address_map &map) ATTR_COLD;
@ -95,7 +104,6 @@ private:
void scyclone_sub_map(address_map &map) ATTR_COLD;
INTERRUPT_GEN_MEMBER(main_irq);
INTERRUPT_GEN_MEMBER(sound_irq);
// video-related
std::unique_ptr<uint8_t[]> m_vram;
@ -134,15 +142,14 @@ private:
uint8_t vram_r(offs_t offset);
// sound related
bool m_speech_enabled = false;
uint8_t m_speech_data = 0;
uint8_t m_dac2_output = 0x80;
void snd_3001_w(uint8_t data);
void snd_3002_w(uint8_t data);
void snd_3003_w(uint8_t data);
void snd_3004_w(uint8_t data);
void snd_3005_w(uint8_t data);
void cvsd_tick(int state);
};
void scyclone_state::machine_start()
@ -157,10 +164,7 @@ void scyclone_state::machine_start()
save_item(NAME(m_p0e));
save_item(NAME(m_vidctrl));
save_item(NAME(m_hascollided));
save_item(NAME(m_speech_enabled));
save_item(NAME(m_speech_data));
save_item(NAME(m_dac2_output));
}
@ -485,7 +489,7 @@ void scyclone_state::snd_3002_w(uint8_t data)
void scyclone_state::snd_3003_w(uint8_t data)
{
m_speech_enabled = !BIT(data, 1);
m_cvsd->fzq_w(BIT(~data, 1));
}
void scyclone_state::snd_3004_w(uint8_t data)
@ -498,25 +502,13 @@ void scyclone_state::snd_3005_w(uint8_t data)
// written at the same time, with the same data as 0x3001
}
INTERRUPT_GEN_MEMBER(scyclone_state::sound_irq)
void scyclone_state::cvsd_tick(int state)
{
m_subcpu->set_input_line(0, HOLD_LINE);
// speech DAC is some sort of 1-bit delta modulation?
if (m_speech_enabled)
if (state)
{
const int bit = BIT(m_speech_data, 7);
if (bit && m_dac2_output < 0xff)
m_dac2_output++;
else if (!bit && m_dac2_output > 0)
m_dac2_output--;
m_cvsd->digin_w(BIT(m_speech_data, 7));
m_speech_data <<= 1;
}
else if (m_dac2_output != 0x80)
m_dac2_output += (m_dac2_output < 0x80) ? +1 : -1;
m_speech_data <<= 1;
m_dac[1]->write(m_dac2_output);
}
@ -561,7 +553,7 @@ void scyclone_state::scyclone_sub_map(address_map &map)
map(0x0000, 0x1fff).rom();
map(0x2000, 0x23ff).ram();
map(0x3000, 0x3000).r(m_soundlatch, FUNC(generic_latch_8_device::read)).w(m_dac[0], FUNC(dac_byte_interface::data_w)); // music
map(0x3000, 0x3000).r(m_soundlatch, FUNC(generic_latch_8_device::read)).w("dac", FUNC(dac_byte_interface::data_w)); // music
map(0x3001, 0x3001).w(FUNC(scyclone_state::snd_3001_w));
map(0x3002, 0x3002).w(FUNC(scyclone_state::snd_3002_w)); // speech
map(0x3003, 0x3003).w(FUNC(scyclone_state::snd_3003_w));
@ -683,9 +675,6 @@ void scyclone_state::scyclone(machine_config &config)
m_subcpu->set_addrmap(AS_PROGRAM, &scyclone_state::scyclone_sub_map);
m_subcpu->set_addrmap(AS_IO, &scyclone_state::scyclone_sub_iomap);
attotime snd_irq_period = attotime::from_hz(14400); // drives speech pitch, unknown source but this matches PCB recording
m_subcpu->set_periodic_int(FUNC(scyclone_state::sound_irq), snd_irq_period);
GENERIC_LATCH_8(config, m_soundlatch);
MB14241(config, "mb14241");
@ -707,14 +696,19 @@ void scyclone_state::scyclone(machine_config &config)
SN76477(config, m_snsnd[0]);
m_snsnd[0]->set_enable(1);
m_snsnd[0]->add_route(ALL_OUTPUTS, "speaker", 0.05);
m_snsnd[0]->add_route(ALL_OUTPUTS, "speaker", 0.1);
SN76477(config, m_snsnd[1]);
m_snsnd[1]->set_enable(1);
m_snsnd[1]->add_route(ALL_OUTPUTS, "speaker", 0.05);
m_snsnd[1]->add_route(ALL_OUTPUTS, "speaker", 0.1);
DAC_8BIT_R2R(config, m_dac[0]).add_route(ALL_OUTPUTS, "speaker", 0.05); // unknown DAC
DAC_8BIT_R2R(config, m_dac[1]).add_route(ALL_OUTPUTS, "speaker", 1.0); // unknown DAC
DAC_8BIT_R2R(config, "dac").add_route(ALL_OUTPUTS, "speaker", 0.1); // unknown DAC
HC55516(config, m_cvsd, 0).add_route(ALL_OUTPUTS, "speaker", 0.4);
CLOCK(config, m_cvsd_clock, 14400); // unknown clock source, but this matches PCB recording
m_cvsd_clock->signal_handler().set(FUNC(scyclone_state::cvsd_tick));
m_cvsd_clock->signal_handler().append(m_cvsd, FUNC(hc55516_device::mclock_w));
m_cvsd_clock->signal_handler().append_inputline(m_subcpu, 0, HOLD_LINE);
}