// 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" /*************************************************************************** PARAMETERS ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(A2BUS_ALFAM2, a2bus_alfam2_device, "a2alfam2", "ALF MC1 / Apple Music II") DEFINE_DEVICE_TYPE(A2BUS_AESMS, a2bus_aesms_device, "a2aesms", "Applied Engineering Super Music Synthesizer") #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_sn76489_device::device_add_mconfig(machine_config &config) { SPEAKER(config, "alf_l").front_left(); SPEAKER(config, "alf_r").front_right(); SN76489(config, m_sn1, 1020484); m_sn1->add_route(ALL_OUTPUTS, "alf_l", 0.50); SN76489(config, m_sn2, 1020484); m_sn2->add_route(ALL_OUTPUTS, "alf_l", 0.50); m_sn2->add_route(ALL_OUTPUTS, "alf_r", 0.50); SN76489(config, m_sn3, 1020484); m_sn3->add_route(ALL_OUTPUTS, "alf_r", 0.50); } void a2bus_aesms_device::device_add_mconfig(machine_config &config) { SPEAKER(config, "alf_l").front_left(); SPEAKER(config, "alf_r").front_right(); SN76489(config, m_sn1, 1020484); m_sn1->add_route(ALL_OUTPUTS, "alf_l", 0.50); SN76489(config, m_sn2, 1020484); m_sn2->add_route(ALL_OUTPUTS, "alf_l", 0.50); m_sn2->add_route(ALL_OUTPUTS, "alf_r", 0.50); SN76489(config, m_sn3, 1020484); m_sn3->add_route(ALL_OUTPUTS, "alf_r", 0.50); SN76489(config, m_sn4, 1020484); m_sn4->add_route(ALL_OUTPUTS, "alf_l", 0.50); m_sn4->add_route(ALL_OUTPUTS, "alf_r", 0.50); } //************************************************************************** // LIVE DEVICE //************************************************************************** a2bus_sn76489_device::a2bus_sn76489_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_latch0(0), m_latch1(0), m_latch2(0), m_latch3(0), m_has4thsn(false) { } a2bus_alfam2_device::a2bus_alfam2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : a2bus_sn76489_device(mconfig, A2BUS_ALFAM2, tag, owner, clock) { m_has4thsn = false; } a2bus_aesms_device::a2bus_aesms_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : a2bus_sn76489_device(mconfig, A2BUS_AESMS, tag, owner, clock) { m_has4thsn = true; } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void a2bus_sn76489_device::device_start() { 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_t a2bus_sn76489_device::read_c0nx(uint8_t 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(uint8_t offset, uint8_t data) { switch (offset) { case 0: m_sn1->write(data); m_latch0 = data; break; case 1: m_sn2->write(data); m_latch1 = data; break; case 2: m_sn3->write(data); m_latch2 = data; break; case 3: if (m_has4thsn) { m_sn4->write(data); m_latch3 = data; } break; } } bool a2bus_sn76489_device::take_c800() { return false; }