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// 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"
#define M68000_TAG "sndcpu"
#define MULTIPCM_1_TAG "pcm1"
#define MULTIPCM_2_TAG "pcm2"
#define YM3438_TAG "ymsnd"
#define UART_TAG "uart"
static ADDRESS_MAP_START( segam1audio_map, AS_PROGRAM, 16, segam1audio_device )
AM_RANGE(0x000000, 0x03ffff) AM_ROM AM_REGION(":m1sndcpu", 0)
AM_RANGE(0x080000, 0x09ffff) AM_ROM AM_REGION(":m1sndcpu", 0x20000) // mirror of upper ROM socket
AM_RANGE(0xc20000, 0xc20001) AM_DEVREADWRITE8(UART_TAG, i8251_device, data_r, data_w, 0x00ff)
AM_RANGE(0xc20002, 0xc20003) AM_DEVREADWRITE8(UART_TAG, i8251_device, status_r, control_w, 0x00ff)
AM_RANGE(0xc40000, 0xc40007) AM_DEVREADWRITE8(MULTIPCM_1_TAG, multipcm_device, read, write, 0x00ff)
AM_RANGE(0xc40012, 0xc40013) AM_WRITENOP
AM_RANGE(0xc50000, 0xc50001) AM_WRITE(m1_snd_mpcm_bnk1_w)
AM_RANGE(0xc60000, 0xc60007) AM_DEVREADWRITE8(MULTIPCM_2_TAG, multipcm_device, read, write, 0x00ff)
AM_RANGE(0xc70000, 0xc70001) AM_WRITE(m1_snd_mpcm_bnk2_w)
AM_RANGE(0xd00000, 0xd00007) AM_DEVREADWRITE8(YM3438_TAG, ym3438_device, read, write, 0x00ff)
AM_RANGE(0xf00000, 0xf0ffff) AM_RAM
ADDRESS_MAP_END
static ADDRESS_MAP_START( mpcm1_map, AS_0, 8, segam1audio_device )
AM_RANGE(0x000000, 0x3fffff) AM_ROM AM_REGION(":m1pcm1", 0)
ADDRESS_MAP_END
static ADDRESS_MAP_START( mpcm2_map, AS_0, 8, segam1audio_device )
AM_RANGE(0x000000, 0x3fffff) AM_ROM AM_REGION(":m1pcm2", 0)
ADDRESS_MAP_END
MACHINE_CONFIG_FRAGMENT( segam1audio )
MCFG_CPU_ADD(M68000_TAG, M68000, 10000000) // verified on real h/w
MCFG_CPU_PROGRAM_MAP(segam1audio_map)
MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
MCFG_SOUND_ADD(YM3438_TAG, YM3438, 8000000)
MCFG_SOUND_ROUTE(0, "lspeaker", 0.60)
MCFG_SOUND_ROUTE(1, "rspeaker", 0.60)
MCFG_SOUND_ADD(MULTIPCM_1_TAG, MULTIPCM, 8000000)
MCFG_DEVICE_ADDRESS_MAP(AS_0, mpcm1_map)
MCFG_SOUND_ROUTE(0, "lspeaker", 1.0)
MCFG_SOUND_ROUTE(1, "rspeaker", 1.0)
MCFG_SOUND_ADD(MULTIPCM_2_TAG, MULTIPCM, 8000000)
MCFG_DEVICE_ADDRESS_MAP(AS_0, mpcm2_map)
MCFG_SOUND_ROUTE(0, "lspeaker", 1.0)
MCFG_SOUND_ROUTE(1, "rspeaker", 1.0)
MCFG_DEVICE_ADD(UART_TAG, I8251, 8000000) // T82C51, clock unknown
MCFG_I8251_RXRDY_HANDLER(INPUTLINE(M68000_TAG, M68K_IRQ_2))
MCFG_I8251_TXD_HANDLER(WRITELINE(segam1audio_device, output_txd))
MCFG_CLOCK_ADD("uart_clock", 500000) // 16 times 31.25MHz (standard Sega/MIDI sound data rate)
MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE(UART_TAG, i8251_device, write_txc))
MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE(UART_TAG, i8251_device, write_rxc))
MACHINE_CONFIG_END
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE(SEGAM1AUDIO, segam1audio_device, "segam1audio", "Sega Model 1 Sound Board")
//-------------------------------------------------
// machine_config_additions - device-specific
// machine configurations
//-------------------------------------------------
machine_config_constructor segam1audio_device::device_mconfig_additions() const
{
return MACHINE_CONFIG_NAME( segam1audio );
}
//**************************************************************************
// 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, M68000_TAG),
m_multipcm_1(*this, MULTIPCM_1_TAG),
m_multipcm_2(*this, MULTIPCM_2_TAG),
m_ym(*this, YM3438_TAG),
m_uart(*this, UART_TAG),
m_rxd_handler(*this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void segam1audio_device::device_start()
{
m_rxd_handler.resolve_safe();
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void segam1audio_device::device_reset()
{
m_uart->write_cts(0);
}
WRITE16_MEMBER(segam1audio_device::m1_snd_mpcm_bnk1_w)
{
m_multipcm_1->set_bank(0x100000 * (data & 3), 0x100000 * (data & 3));
}
WRITE16_MEMBER(segam1audio_device::m1_snd_mpcm_bnk2_w)
{
m_multipcm_2->set_bank(0x100000 * (data & 3), 0x100000 * (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);
}
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