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/*********************************************************************

    a2alfsm2.c

    Implementation of the ALF Apple Music II card (originally marketed as the "MC1")
    The AE Super Music Synthesizer is a superset of this card (4x76489 instead of 3)

*********************************************************************/

#include "a2alfam2.h"
#include "includes/apple2.h"
#include "sound/sn76496.h"

/***************************************************************************
    PARAMETERS
***************************************************************************/

//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************

const device_type A2BUS_ALFAM2 = &device_creator<a2bus_alfam2_device>;
const device_type A2BUS_AESMS = &device_creator<a2bus_aesms_device>;

#define SN1_TAG         "sn76489_1" // left
#define SN2_TAG         "sn76489_2" // center
#define SN3_TAG         "sn76489_3" // right
#define SN4_TAG         "sn76489_4" // center?

//-------------------------------------------------
//  sn76496_config psg_intf
//-------------------------------------------------

static const sn76496_config psg_intf =
{
	DEVCB_NULL
};

MACHINE_CONFIG_FRAGMENT( a2alfam2 )
	MCFG_SPEAKER_STANDARD_STEREO("alf_l", "alf_r")
	MCFG_SOUND_ADD(SN1_TAG, SN76489, 1020484)
	MCFG_SOUND_CONFIG(psg_intf)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50)
	MCFG_SOUND_ADD(SN2_TAG, SN76489, 1020484)
	MCFG_SOUND_CONFIG(psg_intf)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50)
	MCFG_SOUND_ADD(SN3_TAG, SN76489, 1020484)
	MCFG_SOUND_CONFIG(psg_intf)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50)
MACHINE_CONFIG_END

MACHINE_CONFIG_FRAGMENT( a2aesms )
	MCFG_SPEAKER_STANDARD_STEREO("alf_l", "alf_r")
	MCFG_SOUND_ADD(SN1_TAG, SN76489, 1020484)
	MCFG_SOUND_CONFIG(psg_intf)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50)
	MCFG_SOUND_ADD(SN2_TAG, SN76489, 1020484)
	MCFG_SOUND_CONFIG(psg_intf)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50)
	MCFG_SOUND_ADD(SN3_TAG, SN76489, 1020484)
	MCFG_SOUND_CONFIG(psg_intf)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50)
	MCFG_SOUND_ADD(SN4_TAG, SN76489, 1020484)
	MCFG_SOUND_CONFIG(psg_intf)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50)
MACHINE_CONFIG_END

/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/

//-------------------------------------------------
//  machine_config_additions - device-specific
//  machine configurations
//-------------------------------------------------

machine_config_constructor a2bus_sn76489_device::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( a2alfam2 );
}

machine_config_constructor a2bus_aesms_device::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( a2aesms );
}

//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

a2bus_sn76489_device::a2bus_sn76489_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
	device_t(mconfig, type, name, tag, owner, clock, shortname, source),
	device_a2bus_card_interface(mconfig, *this),
	m_sn1(*this, SN1_TAG),
	m_sn2(*this, SN2_TAG),
	m_sn3(*this, SN3_TAG),
	m_sn4(*this, SN4_TAG)
{
}

a2bus_alfam2_device::a2bus_alfam2_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
	a2bus_sn76489_device(mconfig, A2BUS_ALFAM2, "ALF MC1 / Apple Music II", tag, owner, clock, "a2alfam2", __FILE__)
{
	m_has4thsn = false;
}

a2bus_aesms_device::a2bus_aesms_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
	a2bus_sn76489_device(mconfig, A2BUS_ALFAM2, "Applied Engineering Super Music Synthesizer", tag, owner, clock, "a2aesms", __FILE__)
{
	m_has4thsn = true;
}

//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void a2bus_sn76489_device::device_start()
{
	// set_a2bus_device makes m_slot valid
	set_a2bus_device();
	m_latch0 = m_latch1 = m_latch2 = m_latch3 = 0;

	save_item(NAME(m_latch0));
	save_item(NAME(m_latch1));
	save_item(NAME(m_latch2));
	save_item(NAME(m_latch3));
}

void a2bus_sn76489_device::device_reset()
{
	m_latch0 = m_latch1 = m_latch2 = m_latch3 = 0;
}

UINT8 a2bus_sn76489_device::read_c0nx(address_space &space, UINT8 offset)
{
	// SN76489 can't be read, it appears from the schematics this is what happens
	switch (offset)
	{
		case 0:
			return m_latch0;

		case 1:
			return m_latch1;

		case 2:
			return m_latch2;

		case 3:
			return m_latch3;
	}

	return 0xff;
}

void a2bus_sn76489_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data)
{
	switch (offset)
	{
		case 0:
			m_sn1->write(space, 0, data);
			m_latch0 = data;
			break;

		case 1:
			m_sn2->write(space, 0, data);
			m_latch1 = data;
			break;

		case 2:
			m_sn3->write(space, 0, data);
			m_latch2 = data;
			break;

		case 3:
			if (m_has4thsn)
			{
				m_sn4->write(space, 0, data);
				m_latch3 = data;
			}
			break;
	}
}

bool a2bus_sn76489_device::take_c800()
{
	return false;
}