// license:BSD-3-Clause // copyright-holders:Emmanuel Vadot /****************************************** PICO emulation ****************************************/ /* todo, make this more independent of the Genesis emulation, it's really only the same CPU + VDP and doesn't need to be connected to the Genesis at all. sound is the 315-5641 / D77591, should be compatible with the 7759? but probably wants us to maintain an external buffer of at least 0x40 bytes and feed it on a timer in sync with the timer in the chip? currently no way to select (or display) the story book area of the games? (will require layout and external artwork) */ /* Pico mainboard (PAL version) +---+ +-------------------------------------------------------------------------+ | | | +-+ | | | | +--+ |B| +-+ | | | | |A3| +-+ | | | | +------------------------------+ +--+ |C| +-| | | | | | | GCMK-C2X +-+ | --> PEN | +-----+ +--+ +-| | | | |A3| +--------+ | | | A1 | +--+ | | +---------+ | | SEGA | | | A2 | |HM53861J | | | 1994 837-10846 +-----+ | | | | | | IAC MAIN PAL +--------+ +---------+ | | MADE IN JAPAN +----+ | | VA0 +----------+ |XTAL| +--+ | | SEGA | +---------+ | | | <-- VCC IN | | 315-5640 | |MC68HC000| |53.2| +--+ | | 9434 W51 | |FN8-A | +----+ |00 | +----------+ | | | | | | | | +----+ | SEGA | | | | | | 2B89N | | | | 315-5313A| | | | | |S0AH9425A| | A4 | | F1001 | +--| | +----------+ +---------+ | | | | | | | | | |9428 LAGG | | --> VIDEO OUT | | | | | | | | +----+ +----------+ +--| | | | +----------------------------+ | | ||||||CARTRIDGE CONNECTOR||||| | | +----------------------------+ | | | +------------------------------------------------------------------------------------------------------------+ A1 = SEGA / 315-5641 / D77591 / 9442CA010 A2 = SEGA / 315-5769 U13 / 9451MD020 A3 = BA10324AF A4 = MALAYSIA 9336 / 651632DFP-15 / 0000988S B = 4K16 / HC00 C = MB3514 / 9325 M36 315-5640 - touchpad controller? 315-5313A - VDP 315-5641 - PCM chip */ /* Pico Implementation By ElBarto (Emmanuel Vadot, elbarto@megadrive.org) Still missing the PCM custom chip Some game will not boot due to this Pico Info from Notaz (http://notaz.gp2x.de/docs/picodoc.txt) addr acc description -------+-----+------------ 800001 byte Version register. ?vv? ????, where v can be: 00 - hardware is for Japan 01 - European version 10 - USA version 11 - ? 800003 byte Buttons, 0 for pressed, 1 for released: bit 0: UP (white) bit 1: DOWN (orange) bit 2: LEFT (blue) bit 3: RIGHT (green) bit 4: red button bit 5: unused? bit 6: unused? bit 7: pen button 800005 byte Most significant byte of pen x coordinate. 800007 byte Least significant byte of pen x coordinate. 800009 byte Most significant byte of pen y coordinate. 80000b byte Least significant byte of pen y coordinate. 80000d byte Page register. One bit means one uncovered page sensor. 00 - storyware closed 01, 03, 07, 0f, 1f, 3f - pages 1-6 either page 5 or page 6 is often unused. 800010 word PCM data register. r/w read returns free bytes left in PCM FIFO buffer writes write data to buffer. 800012 word PCM control register. r/w For writes, it has following possible meanings: ?p?? ???? ???? ?rrr p - set to enable playback? r - sample rate / PCM data type? 0: 8kHz 4bit ADPCM? 1-7: 16kHz variants? For reads, if bit 15 is cleared, it means PCM is 'busy' or something like that, as games sometimes wait for it to become 1. 800019 byte Games write 'S' 80001b byte Games write 'E' 80001d byte Games write 'G' 80001f byte Games write 'A' */ #include "emu.h" #include "includes/megadriv.h" #include "sound/315-5641.h" #include "softlist.h" #define PICO_PENX 1 #define PICO_PENY 2 class pico_base_state : public md_cons_state { public: pico_base_state(const machine_config &mconfig, device_type type, const char *tag) : md_cons_state(mconfig, type, tag), m_sega_315_5641_pcm(*this, "315_5641"), m_io_page(*this, "PAGE"), m_io_pad(*this, "PAD"), m_io_penx(*this, "PENX"), m_io_peny(*this, "PENY") { } optional_device m_sega_315_5641_pcm; required_ioport m_io_page; required_ioport m_io_pad; required_ioport m_io_penx; required_ioport m_io_peny; UINT8 m_page_register; UINT16 pico_read_penpos(int pen); DECLARE_READ16_MEMBER(pico_68k_io_read); DECLARE_WRITE16_MEMBER(pico_68k_io_write); DECLARE_WRITE_LINE_MEMBER(sound_cause_irq); DECLARE_DRIVER_INIT(pico); DECLARE_DRIVER_INIT(picou); DECLARE_DRIVER_INIT(picoj); }; class pico_state : public pico_base_state { public: pico_state(const machine_config &mconfig, device_type type, const char *tag) : pico_base_state(mconfig, type, tag), m_picocart(*this, "picoslot") { } required_device m_picocart; DECLARE_MACHINE_START(pico); }; UINT16 pico_base_state::pico_read_penpos(int pen) { UINT16 penpos = 0; switch (pen) { case PICO_PENX: penpos = m_io_penx->read(); penpos |= 0x6; penpos = penpos * 320 / 255; penpos += 0x3d; break; case PICO_PENY: penpos = m_io_peny->read(); penpos |= 0x6; penpos = penpos * 251 / 255; penpos += 0x1fc; break; } return penpos; } READ16_MEMBER(pico_base_state::pico_68k_io_read ) { UINT8 retdata = 0; switch (offset) { case 0: /* Version register ?XX?????? where XX is 00 for japan, 01 for europe and 10 for USA*/ retdata = m_version_hi_nibble; break; case 1: retdata = m_io_pad->read(); break; /* Still notes from notaz for the pen : The pen can be used to 'draw' either on the drawing pad or on the storyware itself. Both storyware and drawing pad are mapped on single virtual plane, where coordinates range: x: 0x03c - 0x17c y: 0x1fc - 0x2f7 (drawing pad) 0x2f8 - 0x3f3 (storyware) */ case 2: retdata = pico_read_penpos(PICO_PENX) >> 8; break; case 3: retdata = pico_read_penpos(PICO_PENX) & 0x00ff; break; case 4: retdata = pico_read_penpos(PICO_PENY) >> 8; break; case 5: retdata = pico_read_penpos(PICO_PENY) & 0x00ff; break; case 6: /* Page register : 00 - storyware closed 01, 03, 07, 0f, 1f, 3f - pages 1-6 either page 5 or page 6 is often unused. */ { UINT8 tmp = m_io_page->read(); if (tmp == 2 && m_page_register != 0x3f) { m_page_register <<= 1; m_page_register |= 1; } if (tmp == 1 && m_page_register != 0x00) m_page_register >>= 1; retdata = m_page_register; break; } case 8: // toy story 2 checks this for 0x3f (is that 'empty'?) /* Returns free bytes left in the PCM FIFO buffer */ retdata = m_sega_315_5641_pcm->get_fifo_space(); break; case 9: /* For reads, if bit 15 is cleared, it means PCM is 'busy' or something like that, as games sometimes wait for it to become 1. */ // return (m_upd7759->busy_r()^1) << 15; // The BUSY bit stays 1 as long as some PCM sound is playing. // SMPS drivers check 800012 [byte] and clear the "prevent music PCM" byte when the READY bit gets set. // If this is done incorrectly, the voices in Sonic Gameworld (J) are muted by the music's PCM drums. return m_sega_315_5641_pcm->busy_r() << 15; case 7: case 10: case 11: case 12: case 13: case 14: case 15: logerror("pico_68k_io_read %d\n", offset); } return retdata | retdata << 8; } WRITE_LINE_MEMBER(pico_base_state::sound_cause_irq) { // printf("sound irq\n"); /* sega_315_5641_pcm callback */ m_maincpu->set_input_line(3, HOLD_LINE); } WRITE16_MEMBER(pico_base_state::pico_68k_io_write ) { // printf("pico_68k_io_write %04x %04x %04x\n", offset*2, data, mem_mask); switch (offset) { case 0x10/2: if (mem_mask & 0xFF00) m_sega_315_5641_pcm->port_w(space, 0, (data >> 8) & 0xFF); if (mem_mask & 0x00FF) m_sega_315_5641_pcm->port_w(space, 0, (data >> 0) & 0xFF); break; case 0x12/2: // guess // Note about uPD7759 lines: // reset line: 1 - normal, 1->0 - reset chip, 0 - playback disabled // start line: 0->1 - start playback if (mem_mask & 0xFF00) { // I assume that: // value 8000 resets the FIFO? (always used with low reset line) // value 0800 maps to the uPD7759's reset line (0 = reset, 1 = normal) // value 4000 maps to the uPD7759's start line (0->1 = start) m_sega_315_5641_pcm->reset_w((data >> 8) & 0x08); m_sega_315_5641_pcm->start_w((data >> 8) & 0x40); if (data & 0x4000) { // Somewhere between "Reset Off" and the first sample data, // we need to send a few commands to make the sample stream work. // Doing that when rising the "start" line seems to work fine. m_sega_315_5641_pcm->port_w(space, 0, 0xFF); // "Last Sample" value (must be >= 0x10) m_sega_315_5641_pcm->port_w(space, 0, 0x00); // Dummy 1 m_sega_315_5641_pcm->port_w(space, 0, 0x00); // Addr MSB m_sega_315_5641_pcm->port_w(space, 0, 0x00); // Addr LSB } } /*m_sega_315_5641_pcm->reset_w(0); m_sega_315_5641_pcm->start_w(0); m_sega_315_5641_pcm->reset_w(1); m_sega_315_5641_pcm->start_w(1); if (mem_mask&0x00ff) m_sega_315_5641_pcm->port_w(space,0,data&0xff); if (mem_mask&0xff00) m_sega_315_5641_pcm->port_w(space,0,(data>>8)&0xff);*/ break; } } static ADDRESS_MAP_START( pico_mem, AS_PROGRAM, 16, pico_base_state ) AM_RANGE(0x000000, 0x3fffff) AM_ROM AM_RANGE(0x800000, 0x80001f) AM_READWRITE(pico_68k_io_read, pico_68k_io_write) AM_RANGE(0xc00000, 0xc0001f) AM_DEVREADWRITE("gen_vdp", sega315_5313_device, vdp_r, vdp_w) AM_RANGE(0xe00000, 0xe0ffff) AM_RAM AM_MIRROR(0x1f0000) ADDRESS_MAP_END static INPUT_PORTS_START( pico ) PORT_START("PAD") PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1) PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1) PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1) PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1) PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("Red Button") PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("Pen Button") PORT_START("PAGE") PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME("Increment Page") PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(1) PORT_NAME("Decrement Page") PORT_START("PENX") PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(30) PORT_KEYDELTA(10) PORT_MINMAX(0, 255) PORT_PLAYER(1) PORT_NAME("PEN X") PORT_START("PENY") PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(30) PORT_KEYDELTA(10) PORT_MINMAX(0,255 ) PORT_PLAYER(1) PORT_NAME("PEN Y") INPUT_PORTS_END static SLOT_INTERFACE_START(pico_cart) SLOT_INTERFACE_INTERNAL("rom", MD_STD_ROM) SLOT_INTERFACE_INTERNAL("rom_sram", MD_ROM_SRAM) // not sure these are needed... SLOT_INTERFACE_INTERNAL("rom_sramsafe", MD_ROM_SRAM) // not sure these are needed... SLOT_INTERFACE_END MACHINE_START_MEMBER(pico_state,pico) { m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x000000, 0x7fffff, read16_delegate(FUNC(base_md_cart_slot_device::read),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xa13000, 0xa130ff, read16_delegate(FUNC(base_md_cart_slot_device::read_a13),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write_a13),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xa15000, 0xa150ff, read16_delegate(FUNC(base_md_cart_slot_device::read_a15),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write_a15),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_write_handler(0xa14000, 0xa14003, write16_delegate(FUNC(base_md_cart_slot_device::write_tmss_bank),(base_md_cart_slot_device*)m_picocart)); m_vdp->stop_timers(); } static MACHINE_CONFIG_START( pico, pico_state ) MCFG_FRAGMENT_ADD( md_ntsc ) MCFG_CPU_MODIFY("maincpu") MCFG_CPU_PROGRAM_MAP(pico_mem) MCFG_DEVICE_REMOVE("genesis_snd_z80") MCFG_DEVICE_REMOVE("ymsnd") MCFG_MACHINE_START_OVERRIDE( pico_state, pico ) MCFG_MACHINE_RESET_OVERRIDE( pico_base_state, ms_megadriv ) MCFG_PICO_CARTRIDGE_ADD("picoslot", pico_cart, nullptr) MCFG_SOFTWARE_LIST_ADD("cart_list","pico") MCFG_SOUND_ADD("315_5641", SEGA_315_5641_PCM, UPD7759_STANDARD_CLOCK*2) MCFG_UPD7759_DRQ_CALLBACK(WRITELINE(pico_state,sound_cause_irq)) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "lspeaker", 0.16) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "rspeaker", 0.16) MACHINE_CONFIG_END static MACHINE_CONFIG_START( picopal, pico_state ) MCFG_FRAGMENT_ADD( md_pal ) MCFG_CPU_MODIFY("maincpu") MCFG_CPU_PROGRAM_MAP(pico_mem) MCFG_DEVICE_REMOVE("genesis_snd_z80") MCFG_DEVICE_REMOVE("ymsnd") MCFG_MACHINE_START_OVERRIDE( pico_state, pico ) MCFG_MACHINE_RESET_OVERRIDE( pico_base_state, ms_megadriv ) MCFG_PICO_CARTRIDGE_ADD("picoslot", pico_cart, nullptr) MCFG_SOFTWARE_LIST_ADD("cart_list","pico") MCFG_SOUND_ADD("315_5641", SEGA_315_5641_PCM, UPD7759_STANDARD_CLOCK*2) MCFG_UPD7759_DRQ_CALLBACK(WRITELINE(pico_state,sound_cause_irq)) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "lspeaker", 0.16) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "rspeaker", 0.16) MACHINE_CONFIG_END ROM_START( pico ) ROM_REGION(MD_CPU_REGION_SIZE, "maincpu", ROMREGION_ERASEFF) ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF) ROM_END ROM_START( picou ) ROM_REGION(MD_CPU_REGION_SIZE, "maincpu", ROMREGION_ERASEFF) ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF) ROM_END ROM_START( picoj ) ROM_REGION(MD_CPU_REGION_SIZE, "maincpu", ROMREGION_ERASEFF) ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF) ROM_END DRIVER_INIT_MEMBER(pico_base_state, pico) { DRIVER_INIT_CALL(megadrie); DRIVER_INIT_CALL(mess_md_common); m_version_hi_nibble = 0x60; // Export PAL } DRIVER_INIT_MEMBER(pico_base_state, picou) { DRIVER_INIT_CALL(megadriv); DRIVER_INIT_CALL(mess_md_common); m_version_hi_nibble = 0x40; // Export NTSC } DRIVER_INIT_MEMBER(pico_base_state, picoj) { DRIVER_INIT_CALL(megadrij); DRIVER_INIT_CALL(mess_md_common); m_version_hi_nibble = 0x00; // JPN NTSC } CONS( 1994, pico, 0, 0, picopal, pico, pico_base_state, pico, "Sega", "Pico (Europe, PAL)", MACHINE_NOT_WORKING) CONS( 1994, picou, pico, 0, pico, pico, pico_base_state, picou, "Sega", "Pico (USA, NTSC)", MACHINE_NOT_WORKING) CONS( 1993, picoj, pico, 0, pico, pico, pico_base_state, picoj, "Sega", "Pico (Japan, NTSC)", MACHINE_NOT_WORKING) /* This looks a lot like a Pico with extra sound hardware... YMZ263B is the basis of a Sound Blaster Clone YMF262-M is the OPL3 YAMAHA - MIXT BOOK PLAYER COPERA MMG-1 +-------------+ | | |------+ | | | | MIDI OUT <-- | | | | | |------+ | | | +------------------------------------------------------------------------------------------------------+ |------+ | | +--+ | | | | | |YM| | MIDI IN <-- | | | |7 | | | | | | |12| +---------+ | |------+ +--+ | +------+ |8B| | YAMAHA | | | |||| | | +--+ | YMZ263B | | +---------||--+ | +--------+ | | | || | |YM7 128B| +---------+ +---+ | || | +--------+ |YMF| | +---------||----------+ |262| | | || |-M | | | || +---+ | | || | | || SEGA | |------+ || 1993 837-9845 COPERA | | | || MADE IN JAPAN +--| | | || VA0 | --> PEN CONTROL <-- | || | | | | || +--| | | || | | | || | |------+ || +----+ | | || |XTAL| +------------+ | | || | | | OKI JAPAN | +----+ | || +----------+ |53.6| | M54C864-80 | | | | |||| | SEGA | |93 | +------------+ | | | +--+ | 315-5639 | | Mhz| | | | | U11| +----+ +-------------+ | E | | |9341PD025 | | | | X | |--+ +----------+ | SEGA | | T | MIC <-- | +----+ +----+ | 315-5313A | | E | | | |TC51| |TC51| | FC1001 | | N | |--+ |832A| |832A| | 9331 AASG | | D | | |FL-1| |FL-1| | | | E | | |0 | |0 | | | | D | | | | | | | | | | |--+ +----+ +----+ +-------------+ | | +-- | | C | | |--+ | O | S-AUDIO <-| | +-----------+ +-------+ | N | | |--+ | SEGA | | SEGA | +-----------+ | N | +-- | | 315-5640 | |315-564| | 3D4 UA | | E | |--+ | 9333 W26 | |1 | |HD68HC000CP| | C | | | | |D77591 | |8 | | T | |--+ | | +-------+ | | | O | S-VIDEO <-- | | | | | | R | |--+ | | | | | | | +-----------+ | JAPAN| | | | +-----------+ | | |--+ | | VCC --> | +----------------------------------------------+ | | |--+ | CARTRIDGE | +----+ | | CONNECTOR | | | +----------------------------------------------+ | +-----------------------------------------------------------------------------------------------------------------------------------+ */ class copera_state : public pico_base_state { public: copera_state(const machine_config &mconfig, device_type type, const char *tag) : pico_base_state(mconfig, type, tag), m_picocart(*this, "coperaslot") { } required_device m_picocart; DECLARE_MACHINE_START(copera); }; static ADDRESS_MAP_START( copera_mem, AS_PROGRAM, 16, copera_state ) AM_RANGE(0x000000, 0x3fffff) AM_ROM AM_RANGE(0x800000, 0x80001f) AM_READWRITE(pico_68k_io_read, pico_68k_io_write) AM_RANGE(0xc00000, 0xc0001f) AM_DEVREADWRITE("gen_vdp", sega315_5313_device, vdp_r, vdp_w) AM_RANGE(0xe00000, 0xe0ffff) AM_RAM AM_MIRROR(0x1f0000) ADDRESS_MAP_END static SLOT_INTERFACE_START(copera_cart) SLOT_INTERFACE_INTERNAL("rom", MD_STD_ROM) SLOT_INTERFACE_INTERNAL("rom_sram", MD_ROM_SRAM) // not sure these are needed... SLOT_INTERFACE_INTERNAL("rom_sramsafe", MD_ROM_SRAM) // not sure these are needed... SLOT_INTERFACE_END MACHINE_START_MEMBER(copera_state,copera) { m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x000000, 0x7fffff, read16_delegate(FUNC(base_md_cart_slot_device::read),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xa13000, 0xa130ff, read16_delegate(FUNC(base_md_cart_slot_device::read_a13),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write_a13),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xa15000, 0xa150ff, read16_delegate(FUNC(base_md_cart_slot_device::read_a15),(base_md_cart_slot_device*)m_picocart), write16_delegate(FUNC(base_md_cart_slot_device::write_a15),(base_md_cart_slot_device*)m_picocart)); m_maincpu->space(AS_PROGRAM).install_write_handler(0xa14000, 0xa14003, write16_delegate(FUNC(base_md_cart_slot_device::write_tmss_bank),(base_md_cart_slot_device*)m_picocart)); m_sega_315_5641_pcm->reset_w(0); m_sega_315_5641_pcm->start_w(0); m_sega_315_5641_pcm->reset_w(1); m_sega_315_5641_pcm->start_w(1); } static MACHINE_CONFIG_START( copera, copera_state ) MCFG_FRAGMENT_ADD( md_ntsc ) MCFG_CPU_MODIFY("maincpu") MCFG_CPU_PROGRAM_MAP(copera_mem) MCFG_DEVICE_REMOVE("genesis_snd_z80") MCFG_DEVICE_REMOVE("ymsnd") MCFG_MACHINE_START_OVERRIDE( copera_state, copera ) MCFG_MACHINE_RESET_OVERRIDE( pico_base_state, ms_megadriv ) MCFG_COPERA_CARTRIDGE_ADD("coperaslot", copera_cart, nullptr) MCFG_SOFTWARE_LIST_ADD("cart_list","copera") MCFG_SOUND_ADD("315_5641", SEGA_315_5641_PCM, UPD7759_STANDARD_CLOCK) MCFG_UPD7759_DRQ_CALLBACK(WRITELINE(copera_state,sound_cause_irq)) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "lspeaker", 0.16) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "rspeaker", 0.16) MACHINE_CONFIG_END ROM_START( copera ) ROM_REGION(MD_CPU_REGION_SIZE, "maincpu", ROMREGION_ERASEFF) ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF) ROM_END CONS( 1993, copera, 0, 0, copera, pico, pico_base_state, picoj, "Yamaha / Sega", "Yamaha Mixt Book Player Copera", MACHINE_NOT_WORKING)