// license:BSD-3-Clause // copyright-holders:R. Belmont /*************************************************************************** Sega Model 1 sound board (68000 + 2x 315-5560 "MultiPCM") used for Model 1 and early Model 2 games ***************************************************************************/ #include "emu.h" #include "audio/segam1audio.h" #include "machine/clock.h" #include "speaker.h" void segam1audio_device::segam1audio_map(address_map &map) { map(0x000000, 0x03ffff).rom(); map(0x080000, 0x09ffff).rom().region("sndcpu", 0x20000); // mirror of upper ROM socket map(0xc20000, 0xc20003).rw(m_uart, FUNC(i8251_device::read), FUNC(i8251_device::write)).umask16(0x00ff); map(0xc40000, 0xc40007).rw(m_multipcm_1, FUNC(multipcm_device::read), FUNC(multipcm_device::write)).umask16(0x00ff); map(0xc40012, 0xc40013).nopw(); map(0xc50000, 0xc50001).w(FUNC(segam1audio_device::m1_snd_mpcm_bnk1_w)); map(0xc60000, 0xc60007).rw(m_multipcm_2, FUNC(multipcm_device::read), FUNC(multipcm_device::write)).umask16(0x00ff); map(0xc70000, 0xc70001).w(FUNC(segam1audio_device::m1_snd_mpcm_bnk2_w)); map(0xd00000, 0xd00007).rw(m_ym, FUNC(ym3438_device::read), FUNC(ym3438_device::write)).umask16(0x00ff); map(0xf00000, 0xf0ffff).ram(); } void segam1audio_device::mpcm1_map(address_map &map) { map(0x000000, 0x0fffff).rom(); map(0x100000, 0x1fffff).bankr(m_mpcmbank1); } void segam1audio_device::mpcm2_map(address_map &map) { map(0x000000, 0x0fffff).rom(); map(0x100000, 0x1fffff).bankr(m_mpcmbank2); } //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(SEGAM1AUDIO, segam1audio_device, "segam1audio", "Sega Model 1 Sound Board") //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void segam1audio_device::device_add_mconfig(machine_config &config) { M68000(config, m_audiocpu, 10000000); // verified on real h/w m_audiocpu->set_addrmap(AS_PROGRAM, &segam1audio_device::segam1audio_map); SPEAKER(config, "lspeaker").front_left(); SPEAKER(config, "rspeaker").front_right(); YM3438(config, m_ym, 8000000); m_ym->add_route(0, "lspeaker", 0.60); m_ym->add_route(1, "rspeaker", 0.60); MULTIPCM(config, m_multipcm_1, 8000000); m_multipcm_1->set_addrmap(0, &segam1audio_device::mpcm1_map); m_multipcm_1->add_route(0, "lspeaker", 1.0); m_multipcm_1->add_route(1, "rspeaker", 1.0); MULTIPCM(config, m_multipcm_2, 8000000); m_multipcm_2->set_addrmap(0, &segam1audio_device::mpcm2_map); m_multipcm_2->add_route(0, "lspeaker", 1.0); m_multipcm_2->add_route(1, "rspeaker", 1.0); I8251(config, m_uart, 8000000); // T82C51, clock unknown m_uart->rxrdy_handler().set_inputline(m_audiocpu, M68K_IRQ_2); m_uart->txd_handler().set(FUNC(segam1audio_device::output_txd)); clock_device &uart_clock(CLOCK(config, "uart_clock", 500000)); // 16 times 31.25MHz (standard Sega/MIDI sound data rate) uart_clock.signal_handler().set(m_uart, FUNC(i8251_device::write_txc)); uart_clock.signal_handler().append(m_uart, FUNC(i8251_device::write_rxc)); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // segam1audio_device - constructor //------------------------------------------------- segam1audio_device::segam1audio_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, SEGAM1AUDIO, tag, owner, clock), m_audiocpu(*this, "sndcpu"), m_multipcm_1(*this, "pcm1"), m_multipcm_2(*this, "pcm2"), m_ym(*this, "ymsnd"), m_uart(*this, "uart"), m_multipcm1_region(*this, "pcm1"), m_multipcm2_region(*this, "pcm2"), m_mpcmbank1(*this, "m1pcm1_bank"), m_mpcmbank2(*this, "m1pcm2_bank"), m_rxd_handler(*this) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void segam1audio_device::device_start() { m_rxd_handler.resolve_safe(); m_mpcmbank1->configure_entries(0, 4, m_multipcm1_region->base(), 0x100000); m_mpcmbank2->configure_entries(0, 4, m_multipcm2_region->base(), 0x100000); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void segam1audio_device::device_reset() { m_uart->write_cts(0); } void segam1audio_device::m1_snd_mpcm_bnk1_w(uint16_t data) { m_mpcmbank1->set_entry(data & 3); } void segam1audio_device::m1_snd_mpcm_bnk2_w(uint16_t data) { m_mpcmbank2->set_entry(data & 3); } WRITE_LINE_MEMBER(segam1audio_device::write_txd) { m_uart->write_rxd(state); } WRITE_LINE_MEMBER(segam1audio_device::output_txd) { m_rxd_handler(state); }