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// license:BSD-3-Clause
// copyright-holders:Chris Hardy
/***************************************************************************
Space Firebird hardware
****************************************************************************/
#include "emu.h"
#include "includes/spacefb.h"
#include "cpu/mcs48/mcs48.h"
#include "sound/dac.h"
#include "sound/samples.h"
#include "sound/volt_reg.h"
#include "speaker.h"
uint8_t spacefb_state::audio_p2_r()
{
return (m_sound_latch & 0x18) << 1;
}
READ_LINE_MEMBER(spacefb_state::audio_t0_r)
{
return BIT(m_sound_latch, 5);
}
READ_LINE_MEMBER(spacefb_state::audio_t1_r)
{
return BIT(m_sound_latch, 2);
}
WRITE8_MEMBER(spacefb_state::port_1_w)
{
m_audiocpu->set_input_line(0, (data & 0x02) ? CLEAR_LINE : ASSERT_LINE);
/* enemy killed */
if (!(data & 0x01) && (m_sound_latch & 0x01)) m_samples->start(0,0);
/* ship fire */
if (!(data & 0x40) && (m_sound_latch & 0x40)) m_samples->start(1,1);
/*
* Explosion Noise
*
* Actual sample has a bit of attack at the start, but these doesn't seem to be an easy way
* to play the attack part, then loop the middle bit until the sample is turned off
* Fortunately it seems like the recorded sample of the spaceship death is the longest the sample plays for.
* We loop it just in case it runs out
*/
if ((data & 0x80) != (m_sound_latch & 0x80))
{
if (data & 0x80)
/* play decaying noise */
m_samples->start(2,3);
else
/* start looping noise */
m_samples->start(2,2, true);
}
m_sound_latch = data;
}
static const char *const spacefb_sample_names[] =
{
"*spacefb",
"ekilled",
"shipfire",
"explode1",
"explode2",
nullptr
};
void spacefb_state::spacefb_audio(machine_config &config)
{
SPEAKER(config, "speaker").front_center();
DAC_8BIT_R2R(config, "dac", 0).add_route(ALL_OUTPUTS, "speaker", 0.25); // unknown DAC
voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref", 0));
vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);
SAMPLES(config, m_samples);
m_samples->set_channels(3);
m_samples->set_samples_names(spacefb_sample_names);
m_samples->add_route(ALL_OUTPUTS, "speaker", 1.0);
}
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