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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*********************************************************************
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 "emu.h"
#include "a2alfam2.h"
#include "sound/sn76496.h"
#include "speaker.h"
#include <algorithm>
namespace {
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class a2bus_alfam2_device:
public device_t,
public device_a2bus_card_interface
{
public:
a2bus_alfam2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
a2bus_alfam2_device(mconfig, A2BUS_ALFAM2, tag, owner, clock)
{
}
protected:
// construction/destruction
a2bus_alfam2_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
// overrides of standard a2bus slot functions
virtual uint8_t read_c0nx(uint8_t offset) override;
virtual void write_c0nx(uint8_t offset, uint8_t data) override;
required_device<sn76489_device> m_sn1;
required_device<sn76489_device> m_sn2;
required_device<sn76489_device> m_sn3;
optional_device<sn76489_device> m_sn4;
private:
uint8_t m_latch[4];
};
class a2bus_aesms_device : public a2bus_alfam2_device
{
public:
a2bus_aesms_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
a2bus_alfam2_device(mconfig, A2BUS_AESMS, tag, owner, clock)
{
}
protected:
virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
};
/***************************************************************************
PARAMETERS
***************************************************************************/
#define SN1_TAG "sn76489_1" // left
#define SN2_TAG "sn76489_2" // center
#define SN3_TAG "sn76489_3" // right
#define SN4_TAG "sn76489_4" // center?
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void a2bus_alfam2_device::device_add_mconfig(machine_config &config)
{
SPEAKER(config, "alf", 2).front();
SN76489(config, m_sn1, 1020484);
m_sn1->add_route(ALL_OUTPUTS, "alf", 0.50, 0);
SN76489(config, m_sn2, 1020484);
m_sn2->add_route(ALL_OUTPUTS, "alf", 0.50, 0);
m_sn2->add_route(ALL_OUTPUTS, "alf", 0.50, 1);
SN76489(config, m_sn3, 1020484);
m_sn3->add_route(ALL_OUTPUTS, "alf", 0.50, 1);
}
void a2bus_aesms_device::device_add_mconfig(machine_config &config)
{
SPEAKER(config, "alf", 2).front();
SN76489(config, m_sn1, 1020484);
m_sn1->add_route(ALL_OUTPUTS, "alf", 0.50, 0);
SN76489(config, m_sn2, 1020484);
m_sn2->add_route(ALL_OUTPUTS, "alf", 0.50, 0);
m_sn2->add_route(ALL_OUTPUTS, "alf", 0.50, 1);
SN76489(config, m_sn3, 1020484);
m_sn3->add_route(ALL_OUTPUTS, "alf", 0.50, 1);
SN76489(config, m_sn4, 1020484);
m_sn4->add_route(ALL_OUTPUTS, "alf", 0.50, 0);
m_sn4->add_route(ALL_OUTPUTS, "alf", 0.50, 1);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
a2bus_alfam2_device::a2bus_alfam2_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, type, tag, owner, clock),
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),
m_latch{ 0, 0, 0, 0 }
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void a2bus_alfam2_device::device_start()
{
save_item(NAME(m_latch));
}
void a2bus_alfam2_device::device_reset()
{
std::fill(std::begin(m_latch), std::end(m_latch), 0);
}
uint8_t a2bus_alfam2_device::read_c0nx(uint8_t offset)
{
// SN76489 can't be read, it appears from the schematics this is what happens
switch (offset)
{
case 0:
case 1:
case 2:
case 3:
return m_latch[offset];
}
return 0xff;
}
void a2bus_alfam2_device::write_c0nx(uint8_t offset, uint8_t data)
{
switch (offset)
{
case 0:
m_sn1->write(data);
m_latch[0] = data;
break;
case 1:
m_sn2->write(data);
m_latch[1] = data;
break;
case 2:
m_sn3->write(data);
m_latch[2] = data;
break;
case 3:
if (m_sn4)
{
m_sn4->write(data);
m_latch[3] = data;
}
break;
}
}
} // anonymous namespace
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_ALFAM2, device_a2bus_card_interface, a2bus_alfam2_device, "a2alfam2", "ALF MC1 / Apple Music II")
DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_AESMS, device_a2bus_card_interface, a2bus_aesms_device, "a2aesms", "Applied Engineering Super Music Synthesizer")
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