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// license:BSD-3-Clause
// copyright-holders:Derrick Renaud,Couriersud
/*************************************************************************
audio/qix.c
*************************************************************************/
#include "emu.h"
#include "includes/qix.h"
#include "cpu/m6800/m6800.h"
#include "cpu/m6809/m6809.h"
#include "sound/discrete.h"
#include "sound/sn76496.h"
#include "speaker.h"
/* Discrete Sound Input Nodes */
#define QIX_DAC_DATA NODE_01
#define QIX_VOL_DATA NODE_02
#define QIX_VOL_DATA_L NODE_03
#define QIX_VOL_DATA_R NODE_04
/***************************************************************************
Audio handlers
***************************************************************************/
void qix_state::qix_dac_w(uint8_t data)
{
m_discrete->write(QIX_DAC_DATA, data);
}
void qix_state::qix_vol_w(uint8_t data)
{
m_discrete->write(QIX_VOL_DATA, data);
}
/************************************************************************/
/* qix Sound System Analog emulation */
/************************************************************************/
/*
* This hardware is capable of independent L/R volume control,
* but only sdungeon uses it for a stereo effect.
* Other games just use it for fixed L/R volume control.
*
* This is such a basic sound system that there is only one effect.
* So I won't bother keeping proper voltages levels, and will just
* start with the final gain.
*/
static const discrete_comp_adder_table qix_attn_table =
{
DISC_COMP_P_RESISTOR, 0, 4,
{RES_K(22)+250, RES_K(10)+250, RES_K(5.6)+250, RES_K(3.3)+250}
};
static DISCRETE_SOUND_START(qix_discrete)
/* NODE */
DISCRETE_INPUTX_DATA(QIX_DAC_DATA, 128, -128*128, 128)
DISCRETE_INPUT_DATA (QIX_VOL_DATA)
/* Separate the two 4-bit channels. */
DISCRETE_TRANSFORM3(QIX_VOL_DATA_L, QIX_VOL_DATA, 16, 0x0f, "01/2&")
DISCRETE_TRANSFORM2(QIX_VOL_DATA_R, QIX_VOL_DATA, 0x0f, "01&")
/* Work out the parallel resistance of the selected resistors. */
DISCRETE_COMP_ADDER(NODE_10, QIX_VOL_DATA_L, &qix_attn_table)
DISCRETE_COMP_ADDER(NODE_20, QIX_VOL_DATA_R, &qix_attn_table)
/* Then use it for the resistor divider network. */
DISCRETE_TRANSFORM3(NODE_11, NODE_10, RES_K(10), QIX_DAC_DATA, "001+/2*")
DISCRETE_TRANSFORM3(NODE_21, NODE_20, RES_K(10), QIX_DAC_DATA, "001+/2*")
/* If no resistors are selected (0), then the volume is full. */
DISCRETE_SWITCH(NODE_12, 1, QIX_VOL_DATA_L, QIX_DAC_DATA, NODE_11)
DISCRETE_SWITCH(NODE_22, 1, QIX_VOL_DATA_R, QIX_DAC_DATA, NODE_21)
/* Filter the DC using the lowest case filter. */
DISCRETE_CRFILTER(NODE_13, NODE_12, RES_K(1.5), CAP_U(1))
DISCRETE_CRFILTER(NODE_23, NODE_22, RES_K(1.5), CAP_U(1))
DISCRETE_OUTPUT(NODE_13, 1)
DISCRETE_OUTPUT(NODE_23, 1)
DISCRETE_SOUND_END
/*************************************
*
* PIA handlers
*
*************************************/
void qix_state::sndpia_2_warning_w(uint8_t data)
{
popmessage("PIA 5 write!!");
}
TIMER_CALLBACK_MEMBER(qix_state::deferred_sndpia1_porta_w)
{
m_sndpia1->porta_w(param);
}
void qix_state::sync_sndpia1_porta_w(uint8_t data)
{
/* we need to synchronize this so the sound CPU doesn't drop anything important */
machine().scheduler().synchronize(timer_expired_delegate(FUNC(qix_state::deferred_sndpia1_porta_w), this), data);
}
void qix_state::slither_coinctl_w(uint8_t data)
{
machine().bookkeeping().coin_lockout_w(0, (~data >> 6) & 1);
machine().bookkeeping().coin_counter_w(0, (data >> 5) & 1);
}
/*************************************
*
* IRQ generation
*
*************************************/
WRITE_LINE_MEMBER(qix_state::qix_pia_dint)
{
int combined_state = m_sndpia0->irq_a_state() | m_sndpia0->irq_b_state();
/* DINT is connected to the data CPU's IRQ line */
m_maincpu->set_input_line(M6809_IRQ_LINE, combined_state ? ASSERT_LINE : CLEAR_LINE);
}
WRITE_LINE_MEMBER(qix_state::qix_pia_sint)
{
int combined_state = m_sndpia1->irq_a_state() | m_sndpia1->irq_b_state();
/* SINT is connected to the sound CPU's IRQ line */
m_audiocpu->set_input_line(M6802_IRQ_LINE, combined_state ? ASSERT_LINE : CLEAR_LINE);
}
/*************************************
*
* Audio CPU memory handlers
*
*************************************/
void qix_state::audio_map(address_map &map)
{
map(0x2000, 0x2003).mirror(0x5ffc).rw(m_sndpia2, FUNC(pia6821_device::read), FUNC(pia6821_device::write));
map(0x4000, 0x4003).mirror(0x3ffc).rw(m_sndpia1, FUNC(pia6821_device::read), FUNC(pia6821_device::write));
map(0xd000, 0xffff).rom();
}
/*************************************
*
* Machine drivers
*
*************************************/
void qix_state::qix_audio(machine_config &config)
{
M6802(config, m_audiocpu, SOUND_CLOCK_OSC/2); /* 0.92 MHz */
m_audiocpu->set_addrmap(AS_PROGRAM, &qix_state::audio_map);
PIA6821(config, m_sndpia0, 0);
m_sndpia0->writepa_handler().set(FUNC(qix_state::sync_sndpia1_porta_w));
m_sndpia0->writepb_handler().set(FUNC(qix_state::qix_vol_w));
m_sndpia0->ca2_handler().set("sndpia1", FUNC(pia6821_device::ca1_w));
m_sndpia0->cb2_handler().set(FUNC(qix_state::qix_flip_screen_w));
m_sndpia0->irqa_handler().set(FUNC(qix_state::qix_pia_dint));
m_sndpia0->irqb_handler().set(FUNC(qix_state::qix_pia_dint));
PIA6821(config, m_sndpia1, 0);
m_sndpia1->writepa_handler().set("sndpia0", FUNC(pia6821_device::porta_w));
m_sndpia1->writepb_handler().set(FUNC(qix_state::qix_dac_w));
m_sndpia1->ca2_handler().set("sndpia0", FUNC(pia6821_device::ca1_w));
m_sndpia1->irqa_handler().set(FUNC(qix_state::qix_pia_sint));
m_sndpia1->irqb_handler().set(FUNC(qix_state::qix_pia_sint));
PIA6821(config, m_sndpia2, 0);
m_sndpia2->writepa_handler().set(FUNC(qix_state::sndpia_2_warning_w));
m_sndpia2->writepb_handler().set(FUNC(qix_state::sndpia_2_warning_w));
m_sndpia2->ca2_handler().set(FUNC(qix_state::sndpia_2_warning_w));
m_sndpia2->cb2_handler().set(FUNC(qix_state::sndpia_2_warning_w));
SPEAKER(config, "lspeaker").front_left();
SPEAKER(config, "rspeaker").front_right();
DISCRETE(config, m_discrete, qix_discrete);
m_discrete->add_route(0, "lspeaker", 1.0);
m_discrete->add_route(1, "rspeaker", 1.0);
}
void qix_state::slither_audio(machine_config &config)
{
PIA6821(config, m_sndpia0, 0);
m_sndpia0->readpa_handler().set_ioport("P2");
m_sndpia0->writepb_handler().set(FUNC(qix_state::slither_coinctl_w));
m_sndpia0->cb2_handler().set(FUNC(qix_state::qix_flip_screen_w));
m_sndpia0->irqa_handler().set(FUNC(qix_state::qix_pia_dint));
m_sndpia0->irqb_handler().set(FUNC(qix_state::qix_pia_dint));
SPEAKER(config, "mono").front_center();
SN76489(config, m_sn1, SLITHER_CLOCK_OSC/4/4);
m_sn1->add_route(ALL_OUTPUTS, "mono", 0.50);
SN76489(config, m_sn2, SLITHER_CLOCK_OSC/4/4);
m_sn2->add_route(ALL_OUTPUTS, "mono", 0.50);
}
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