// license:BSD-3-Clause // copyright-holders:R. Belmont /********************************************************************* a2mcms.c Implementation of the Mountain Computer Music System. This was sold standalone and also used as part of the alphaSyntauri and SoundChaser systems. *********************************************************************/ #include "emu.h" #include "a2mcms.h" #include "speaker.h" // the actual sound device (a slot device can't currently also be a sound device so we keep this private here) enum { CTRL_IRQS = 0, CTRL_DMA, CTRL_MASTERVOL }; DEFINE_DEVICE_TYPE(MCMS, mcms_device, "mcmseng", "Mountain Computer Music System engine") /*************************************************************************** PARAMETERS ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(A2BUS_MCMS1, a2bus_mcms1_device, "a2mcms1", "Mountain Computer Music System (card 1)") DEFINE_DEVICE_TYPE(A2BUS_MCMS2, a2bus_mcms2_device, "a2mcms2", "Mountain Computer Music System (card 2)") #define ENGINE_TAG "engine" #define MCFG_MCMS_IRQ_CALLBACK(_cb) \ downcast(*device).set_irq_cb(DEVCB_##_cb); /*************************************************************************** FUNCTION PROTOTYPES ***************************************************************************/ //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- MACHINE_CONFIG_START(a2bus_mcms1_device::device_add_mconfig) SPEAKER(config, "mcms_l").front_left(); SPEAKER(config, "mcms_r").front_right(); MCFG_DEVICE_ADD(ENGINE_TAG, MCMS, 1000000) MCFG_MCMS_IRQ_CALLBACK(WRITELINE(*this, a2bus_mcms1_device, irq_w)) MCFG_SOUND_ROUTE(0, "mcms_l", 1.0) MCFG_SOUND_ROUTE(1, "mcms_r", 1.0) MACHINE_CONFIG_END //************************************************************************** // LIVE DEVICE - Card 1 //************************************************************************** a2bus_mcms1_device::a2bus_mcms1_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_mcms(*this, ENGINE_TAG) { } a2bus_mcms1_device::a2bus_mcms1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : a2bus_mcms1_device(mconfig, A2BUS_MCMS1, tag, owner, clock) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void a2bus_mcms1_device::device_start() { } void a2bus_mcms1_device::device_reset() { m_mcms->set_bus_device(this); } // read once at c0n0 to disable 125 Hz IRQs // read once at c0n1 to enable 125 Hz IRQs uint8_t a2bus_mcms1_device::read_c0nx(uint8_t offset) { if (offset == 0) { m_mcms->control_w(CTRL_IRQS, 0); } else if (offset == 1) { m_mcms->control_w(CTRL_IRQS, 1); } return 0xff; } // read at Cn00: light gun in bit 7, bits 0-5 = 'random' number uint8_t a2bus_mcms1_device::read_cnxx(uint8_t offset) { return m_mcms->get_pen_rand(); } // write 0-255 to Cn00 to set the master volume void a2bus_mcms1_device::write_cnxx(uint8_t offset, uint8_t data) { if (offset == 0) { m_mcms->control_w(CTRL_MASTERVOL, data); } } mcms_device *a2bus_mcms1_device::get_engine(void) { return m_mcms; } WRITE_LINE_MEMBER(a2bus_mcms1_device::irq_w) { if (state == ASSERT_LINE) { raise_slot_irq(); } else { lower_slot_irq(); } } //************************************************************************** // LIVE DEVICE - Card 2 //************************************************************************** a2bus_mcms2_device::a2bus_mcms2_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_card1(nullptr), m_engine(nullptr) { } a2bus_mcms2_device::a2bus_mcms2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : a2bus_mcms2_device(mconfig, A2BUS_MCMS2, tag, owner, clock) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void a2bus_mcms2_device::device_start() { if (slotno() < 2) fatalerror("MCMS: Card 2 must be in slot 2 or greater\n"); } void a2bus_mcms2_device::device_reset() { m_card1 = downcast(a2bus().m_device_list[slotno()-1]); m_engine = m_card1->get_engine(); } // here to soak up false reads from indexed accesses uint8_t a2bus_mcms2_device::read_c0nx(uint8_t offset) { return 0xff; } // write once to c0n0 to disable the card (reset also disables) // write twice to c0n1 to enable the card (value doesn't matter) void a2bus_mcms2_device::write_c0nx(uint8_t offset, uint8_t data) { if (offset == 0) { m_engine->control_w(CTRL_DMA, 0); } else if (offset == 1) { m_engine->control_w(CTRL_DMA, 1); } } void a2bus_mcms2_device::write_cnxx(uint8_t offset, uint8_t data) { m_engine->voiceregs_w(offset, data); } /* Sound device implementation */ mcms_device::mcms_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MCMS, tag, owner, clock), device_sound_interface(mconfig, *this), m_write_irq(*this), m_stream(nullptr), m_timer(nullptr), m_clrtimer(nullptr), m_pBusDevice(nullptr), m_enabled(false), m_mastervol(0), m_rand(0) { } void mcms_device::device_start() { m_write_irq.resolve(); m_stream = machine().sound().stream_alloc(*this, 0, 2, 31250); m_timer = timer_alloc(0, nullptr); m_clrtimer = timer_alloc(1, nullptr); m_enabled = false; memset(m_vols, 0, sizeof(m_vols)); memset(m_table, 0, sizeof(m_table)); memset(m_freq, 0, sizeof(m_freq)); memset(m_acc, 0, sizeof(m_acc)); // the card detect programs volumes and wavetable page but not freq and expects the accumulator to increment for (auto & elem : m_freq) { elem = 0x0040; } save_item(NAME(m_enabled)); save_item(NAME(m_vols)); save_item(NAME(m_table)); save_item(NAME(m_freq)); save_item(NAME(m_acc)); save_item(NAME(m_mastervol)); save_item(NAME(m_rand)); } void mcms_device::device_reset() { m_write_irq(CLEAR_LINE); m_timer->adjust(attotime::never); m_clrtimer->adjust(attotime::never); m_enabled = false; } void mcms_device::device_timer(emu_timer &timer, device_timer_id tid, int param, void *ptr) { if (tid == 0) { m_write_irq(ASSERT_LINE); // clear this IRQ in 10 cycles (?) m_clrtimer->adjust(attotime::from_usec(10), 0); } else if (tid == 1) { m_write_irq(CLEAR_LINE); } } void mcms_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) { stream_sample_t *outL, *outR; int i, v; uint16_t wptr; int8_t sample; int32_t mixL, mixR; outL = outputs[1]; outR = outputs[0]; if (m_enabled) { for (i = 0; i < samples; i++) { mixL = mixR = 0; for (v = 0; v < 16; v++) { m_acc[v] += m_freq[v]; wptr = (m_table[v]<<8) | (m_acc[v]>>8); m_rand = (m_acc[v]>>8) & 0x1f; sample = (m_pBusDevice->slot_dma_read_no_space(wptr) ^ 0x80); if (v & 1) { mixL += sample * m_vols[v]; } else { mixR += sample * m_vols[v]; } } outL[i] = (mixL * m_mastervol)>>9; outR[i] = (mixR * m_mastervol)>>9; } } else { for (i = 0; i < samples; i++) { outL[i] = outR[i] = 0; } } } void mcms_device::voiceregs_w(offs_t offset, uint8_t data) { m_stream->update(); if (offset >= 0x20) { if (offset & 1) // amp { m_vols[(offset-0x21)/2] = data; } else // wavetable page { m_table[(offset-0x20)/2] = data; } } else { if (offset & 1) // freq L { if (offset == 0x1f) { m_freq[0] &= 0xff00; m_freq[0] |= data; } else { int reg = (offset/2)+1; m_freq[reg] &= 0xff00; m_freq[reg] |= data; } } else // freq H { int reg = (offset/2); m_freq[reg] &= 0x00ff; m_freq[reg] |= (data<<8); } } } void mcms_device::control_w(offs_t offset, uint8_t data) { m_stream->update(); switch (offset) { case CTRL_IRQS: if (data == 0) { m_timer->adjust(attotime::never); } else { m_timer->adjust(attotime::zero, 0, attotime::from_hz(125)); } break; case CTRL_DMA: m_enabled = (data == 0) ? false : true; break; case CTRL_MASTERVOL: m_mastervol = data; break; } }