diff options
Diffstat (limited to 'src/devices/bus/a2bus/a2mcms.cpp')
-rw-r--r-- | src/devices/bus/a2bus/a2mcms.cpp | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/src/devices/bus/a2bus/a2mcms.cpp b/src/devices/bus/a2bus/a2mcms.cpp new file mode 100644 index 00000000000..e9bb29d1243 --- /dev/null +++ b/src/devices/bus/a2bus/a2mcms.cpp @@ -0,0 +1,382 @@ +// 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 "a2mcms.h" +#include "includes/apple2.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 +}; + + +const device_type MCMS = &device_creator<mcms_device>; + +/*************************************************************************** + PARAMETERS +***************************************************************************/ + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type A2BUS_MCMS1 = &device_creator<a2bus_mcms1_device>; +const device_type A2BUS_MCMS2 = &device_creator<a2bus_mcms2_device>; + +#define ENGINE_TAG "engine" + +#define MCFG_MCMS_IRQ_CALLBACK(_cb) \ + devcb = &mcms_device::set_irq_cb(*device, DEVCB_##_cb); + +MACHINE_CONFIG_FRAGMENT( a2mcms ) + MCFG_SPEAKER_STANDARD_STEREO("mcms_l", "mcms_r") + + MCFG_DEVICE_ADD(ENGINE_TAG, MCMS, 1000000) + MCFG_MCMS_IRQ_CALLBACK(WRITELINE(a2bus_mcms1_device, irq_w)) + + MCFG_SOUND_ROUTE(0, "mcms_l", 1.0) + MCFG_SOUND_ROUTE(1, "mcms_r", 1.0) +MACHINE_CONFIG_END + +/*************************************************************************** + FUNCTION PROTOTYPES +***************************************************************************/ + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor a2bus_mcms1_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( a2mcms ); +} + +//************************************************************************** +// LIVE DEVICE - Card 1 +//************************************************************************** + +a2bus_mcms1_device::a2bus_mcms1_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_mcms(*this, ENGINE_TAG) +{ +} + +a2bus_mcms1_device::a2bus_mcms1_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, A2BUS_MCMS1, "Mountain Computer Music System (card 1)", tag, owner, clock, "a2mcms1", __FILE__), + device_a2bus_card_interface(mconfig, *this), + m_mcms(*this, ENGINE_TAG) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void a2bus_mcms1_device::device_start() +{ + // set_a2bus_device makes m_slot valid + set_a2bus_device(); +} + +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 a2bus_mcms1_device::read_c0nx(address_space &space, UINT8 offset) +{ + if (offset == 0) + { + m_mcms->control_w(space, CTRL_IRQS, 0); + } + else if (offset == 1) + { + m_mcms->control_w(space, CTRL_IRQS, 1); + } + + return 0xff; +} + +// read at Cn00: light gun in bit 7, bits 0-5 = 'random' number +UINT8 a2bus_mcms1_device::read_cnxx(address_space &space, UINT8 offset) +{ + return m_mcms->get_pen_rand(); +} + +// write 0-255 to Cn00 to set the master volume +void a2bus_mcms1_device::write_cnxx(address_space &space, UINT8 offset, UINT8 data) +{ + if (offset == 0) + { + m_mcms->control_w(space, 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 *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) +{ +} + +a2bus_mcms2_device::a2bus_mcms2_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, A2BUS_MCMS2, "Mountain Computer Music System (card 2)", tag, owner, clock, "a2mcms2", __FILE__), + device_a2bus_card_interface(mconfig, *this) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void a2bus_mcms2_device::device_start() +{ + // set_a2bus_device makes m_slot valid + set_a2bus_device(); + + if (m_slot < 2) + { + fatalerror("MCMS: Card 2 must be in slot 2 or greater\n"); + } +} + +void a2bus_mcms2_device::device_reset() +{ + m_card1 = static_cast<a2bus_mcms1_device *>(m_a2bus->m_device_list[m_slot-1]); + m_engine = m_card1->get_engine(); +} + +// here to soak up false reads from indexed accesses +UINT8 a2bus_mcms2_device::read_c0nx(address_space &space, UINT8 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(address_space &space, UINT8 offset, UINT8 data) +{ + if (offset == 0) + { + m_engine->control_w(space, CTRL_DMA, 0); + } + else if (offset == 1) + { + m_engine->control_w(space, CTRL_DMA, 1); + } +} + +void a2bus_mcms2_device::write_cnxx(address_space &space, UINT8 offset, UINT8 data) +{ + m_engine->voiceregs_w(space, offset, data); +} + + +/* + Sound device implementation +*/ + +mcms_device::mcms_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MCMS, "Mountain Computer Music System engine", tag, owner, clock, "msmseng", __FILE__), + device_sound_interface(mconfig, *this), + m_write_irq(*this) +{ +} + +void mcms_device::device_start() +{ + m_write_irq.resolve(); + m_stream = machine().sound().stream_alloc(*this, 0, 2, 31250); + m_timer = timer_alloc(0, NULL); + m_clrtimer = timer_alloc(1, NULL); + 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 (int i = 0; i < 16; i++) + { + m_freq[i] = 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 wptr; + INT8 sample; + INT32 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; + } + } +} + +WRITE8_MEMBER(mcms_device::voiceregs_w) +{ + 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); + } + } +} + +WRITE8_MEMBER(mcms_device::control_w) +{ + 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; + } +} |