/*************************************************************************** MC 1000 12/05/2009 Skeleton driver. http://ensjo.wikispaces.com/MC-1000+on+JEMU http://ensjo.blogspot.com/2006/11/color-artifacting-no-mc-1000.html ****************************************************************************/ /* TODO: - xtal frequency? - Z80 wait at 0x0000-0x1fff when !hsync & !vsync - 80-column card (MC6845) character generator ROM - Charlemagne / GEM-1000 / Junior Computer ROMs */ #include "includes/mc1000.h" /* Memory Banking */ void mc1000_state::bankswitch() { address_space &program = m_maincpu->space(AS_PROGRAM); /* MC6845 video RAM */ membank("bank2")->set_entry(m_mc6845_bank); /* extended RAM */ if (m_ram->size() > 16*1024) { program.install_readwrite_bank(0x4000, 0x7fff, "bank3"); } else { program.unmap_readwrite(0x4000, 0x7fff); } /* MC6847 video RAM */ if (m_mc6847_bank) { if (m_ram->size() > 16*1024) { program.install_readwrite_bank(0x8000, 0x97ff, "bank4"); } else { program.unmap_readwrite(0x8000, 0x97ff); } } else { program.install_readwrite_bank(0x8000, 0x97ff, "bank4"); } membank("bank4")->set_entry(m_mc6847_bank); /* extended RAM */ if (m_ram->size() > 16*1024) { program.install_readwrite_bank(0x9800, 0xbfff, "bank5"); } else { program.unmap_readwrite(0x9800, 0xbfff); } } /* Read/Write Handlers */ READ8_MEMBER( mc1000_state::printer_r ) { return m_centronics->busy_r(); } WRITE8_MEMBER( mc1000_state::printer_w ) { m_centronics->strobe_w(BIT(data, 0)); } WRITE8_MEMBER( mc1000_state::mc6845_ctrl_w ) { m_mc6845_bank = BIT(data, 0); bankswitch(); } WRITE8_MEMBER( mc1000_state::mc6847_attr_w ) { /* bit description 0 enable CPU video RAM access 1 CSS 2 GM0 3 GM1 4 GM2 5 _INT/EXT 6 _A/S 7 _A/G */ m_mc6847_bank = BIT(data, 0); m_vdg->css_w(BIT(data, 1)); m_vdg->gm0_w(BIT(data, 2)); m_vdg->gm1_w(BIT(data, 3)); m_vdg->gm2_w(BIT(data, 4)); m_vdg->intext_w(BIT(data, 5)); m_vdg->as_w(BIT(data, 6)); m_vdg->ag_w(BIT(data, 7)); bankswitch(); } /* Memory Maps */ static ADDRESS_MAP_START( mc1000_mem, AS_PROGRAM, 8, mc1000_state ) AM_RANGE(0x0000, 0x1fff) AM_RAMBANK("bank1") AM_RANGE(0x2000, 0x27ff) AM_RAMBANK("bank2") AM_SHARE("mc6845_vram") AM_RANGE(0x2800, 0x3fff) AM_RAM AM_RANGE(0x4000, 0x7fff) AM_RAMBANK("bank3") AM_RANGE(0x8000, 0x97ff) AM_RAMBANK("bank4") AM_SHARE("mc6847_vram") AM_RANGE(0x9800, 0xbfff) AM_RAMBANK("bank5") AM_RANGE(0xc000, 0xffff) AM_ROM ADDRESS_MAP_END static ADDRESS_MAP_START( mc1000_io, AS_IO, 8, mc1000_state ) ADDRESS_MAP_GLOBAL_MASK(0xff) AM_RANGE(0x04, 0x04) AM_READWRITE(printer_r, printer_w) AM_RANGE(0x05, 0x05) AM_DEVWRITE(CENTRONICS_TAG, centronics_device, write) // AM_RANGE(0x10, 0x10) AM_DEVWRITE_LEGACY(MC6845_TAG, mc6845_address_w) // AM_RANGE(0x11, 0x11) AM_DEVREADWRITE_LEGACY(MC6845_TAG, mc6845_register_r, mc6845_register_w) AM_RANGE(0x12, 0x12) AM_WRITE(mc6845_ctrl_w) AM_RANGE(0x20, 0x20) AM_DEVWRITE_LEGACY(AY8910_TAG, ay8910_address_w) AM_RANGE(0x40, 0x40) AM_DEVREAD_LEGACY(AY8910_TAG, ay8910_r) AM_RANGE(0x60, 0x60) AM_DEVWRITE_LEGACY(AY8910_TAG, ay8910_data_w) AM_RANGE(0x80, 0x80) AM_WRITE(mc6847_attr_w) ADDRESS_MAP_END /* Input Ports */ static INPUT_PORTS_START( mc1000 ) PORT_START("JOYA") /* Player 1 */ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) /* = 'I' */ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) /* = 'Q' */ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) /* = 'Y' */ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) /* = '1' */ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) /* = '9' */ PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("JOYB") /* Player 2 */ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) /* = '@' */ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(2) /* = 'H' */ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2) /* = 'P' */ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2) /* = 'X' */ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2) /* = '0' */ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW0") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('@') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_H) PORT_CHAR('H') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_P) PORT_CHAR('P') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_X) PORT_CHAR('X') PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW1") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_I) PORT_CHAR('I') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Q) PORT_CHAR('Q') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Y) PORT_CHAR('Y') PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW2") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_J) PORT_CHAR('J') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_R) PORT_CHAR('R') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Z) PORT_CHAR('Z') PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('"') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(':') PORT_CHAR('*') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW3") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_K) PORT_CHAR('K') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_S) PORT_CHAR('S') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RETURN") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13) PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW4") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_L) PORT_CHAR('L') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_T) PORT_CHAR('T') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("SPACE") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ') PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW5") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M) PORT_CHAR('M') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_U) PORT_CHAR('U') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RUBOUT") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8) PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('=') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW6") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_N) PORT_CHAR('N') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_V) PORT_CHAR('V') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('^') PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("ROW7") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_G) PORT_CHAR('G') PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_O) PORT_CHAR('O') PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_W) PORT_CHAR('W') PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RESET") PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'') PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?') PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("MODIFIERS") PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("SHIFT") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1) PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CTRL") PORT_CODE(KEYCODE_LCONTROL) PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_MAMEKEY(RCONTROL)) PORT_START("JOYAKEYMAP") PORT_CONFNAME( 0x01, 0x00, "JOYSTICK A (P1) keyboard mapping" ) PORT_CONFSETTING( 0x00, DEF_STR( Off ) ) PORT_CONFSETTING( 0x01, DEF_STR( On ) ) PORT_START("JOYBKEYMAP") PORT_CONFNAME( 0x01, 0x00, "JOYSTICK B (P2) keyboard mapping" ) PORT_CONFSETTING( 0x00, DEF_STR( Off ) ) PORT_CONFSETTING( 0x01, DEF_STR( On ) ) INPUT_PORTS_END /* Video */ WRITE_LINE_MEMBER( mc1000_state::fs_w ) { m_vsync = state; } WRITE_LINE_MEMBER( mc1000_state::hs_w ) { m_hsync = state; } READ8_MEMBER( mc1000_state::videoram_r ) { if (offset == ~0) return 0xff; m_vdg->inv_w(BIT(m_mc6847_video_ram[offset], 7)); return m_mc6847_video_ram[offset]; } /* AY-3-8910 Interface */ WRITE8_MEMBER( mc1000_state::keylatch_w ) { m_keylatch = data; m_cassette->output(BIT(data, 7) ? -1.0 : +1.0); } READ8_MEMBER( mc1000_state::keydata_r ) { UINT8 data = 0xff; if (!BIT(m_keylatch, 0)) { data &= ioport("ROW0")->read(); if (ioport("JOYBKEYMAP")->read()) data &= ioport("JOYB")->read(); } if (!BIT(m_keylatch, 1)) { data &= ioport("ROW1")->read(); if (ioport("JOYAKEYMAP")->read()) data &= ioport("JOYA")->read(); } if (!BIT(m_keylatch, 2)) data &= ioport("ROW2")->read(); if (!BIT(m_keylatch, 3)) data &= ioport("ROW3")->read(); if (!BIT(m_keylatch, 4)) data &= ioport("ROW4")->read(); if (!BIT(m_keylatch, 5)) data &= ioport("ROW5")->read(); if (!BIT(m_keylatch, 6)) data &= ioport("ROW6")->read(); if (!BIT(m_keylatch, 7)) data &= ioport("ROW7")->read(); data = (ioport("MODIFIERS")->read() & 0xc0) | (data & 0x3f); if (m_cassette->input() < +0.0) data &= 0x7f; return data; } static const ay8910_interface ay8910_intf = { AY8910_SINGLE_OUTPUT, { RES_K(2.2), 0, 0 }, DEVCB_NULL, DEVCB_DRIVER_MEMBER(mc1000_state, keydata_r), DEVCB_DRIVER_MEMBER(mc1000_state, keylatch_w), DEVCB_NULL }; /* Machine Initialization */ void mc1000_state::machine_start() { address_space &program = m_maincpu->space(AS_PROGRAM); /* setup memory banking */ UINT8 *rom = memregion(Z80_TAG)->base(); program.install_readwrite_bank(0x0000, 0x1fff, "bank1"); membank("bank1")->configure_entry(0, rom); membank("bank1")->configure_entry(1, rom + 0xc000); membank("bank1")->set_entry(1); m_rom0000 = 1; program.install_readwrite_bank(0x2000, 0x27ff, "bank2"); membank("bank2")->configure_entry(0, rom + 0x2000); membank("bank2")->configure_entry(1, m_mc6845_video_ram); membank("bank2")->set_entry(0); membank("bank3")->configure_entry(0, rom + 0x4000); membank("bank3")->set_entry(0); membank("bank4")->configure_entry(0, m_mc6847_video_ram); membank("bank4")->configure_entry(1, rom + 0x8000); membank("bank4")->set_entry(0); membank("bank5")->configure_entry(0, rom + 0x9800); membank("bank5")->set_entry(0); bankswitch(); /* register for state saving */ save_item(NAME(m_rom0000)); save_item(NAME(m_mc6845_bank)); save_item(NAME(m_mc6847_bank)); save_item(NAME(m_keylatch)); save_item(NAME(m_hsync)); save_item(NAME(m_vsync)); } void mc1000_state::machine_reset() { membank("bank1")->set_entry(1); m_rom0000 = 1; } /* Machine Driver */ /* Interrupt generator: NE555 chip in astable circuit. +---------*---*---o V+ | | | +-+ | | | |309K | | | |R17 |8 |4 +-+ +-------+ | 7| |3 *-------| |-------> /INT (Z80) | | | | | | +-+R16 2| IC 28 | | |1K +--| | | | | | 555 | +-+ | | | | | 6| |5 *----*?-| |---+ | | | | ---C30 +-------+ ---C29 ---103 |1 ---103 _|_ _|_ _|_ /// /// /// Calculated properties: * 99.74489795918367 Duty Cycle Percentage * 368.1126130105722 Frequency in Hertz * 0.00000693 Seconds Low * 0.0027096299999999998 Seconds High */ #define MC1000_NE555_FREQ (368) /* Hz */ #define MC1000_NE555_DUTY_CYCLE (99.745) /* % */ TIMER_DEVICE_CALLBACK_MEMBER(mc1000_state::ne555_tick) { // (m_ne555_int not needed anymore and can be done with?) m_ne555_int = param; m_maincpu->set_input_line(INPUT_LINE_IRQ0, param); } static const cassette_interface mc1000_cassette_interface = { cassette_default_formats, NULL, (cassette_state)(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED), NULL, NULL }; static const mc6847_interface mc1000_mc6847_intf = { SCREEN_TAG, DEVCB_DRIVER_MEMBER(mc1000_state, videoram_r), DEVCB_DRIVER_LINE_MEMBER(mc1000_state, hs_w), DEVCB_DRIVER_LINE_MEMBER(mc1000_state, fs_w), }; static MACHINE_CONFIG_START( mc1000, mc1000_state ) /* basic machine hardware */ MCFG_CPU_ADD(Z80_TAG, Z80, 3579545) MCFG_CPU_PROGRAM_MAP(mc1000_mem) MCFG_CPU_IO_MAP(mc1000_io) /* timers */ MCFG_TIMER_DRIVER_ADD_PERIODIC("ne555clear", mc1000_state, ne555_tick, attotime::from_hz(MC1000_NE555_FREQ)) MCFG_TIMER_PARAM(CLEAR_LINE) MCFG_TIMER_DRIVER_ADD_PERIODIC("ne555assert", mc1000_state, ne555_tick, attotime::from_hz(MC1000_NE555_FREQ)) MCFG_TIMER_START_DELAY(attotime::from_hz(MC1000_NE555_FREQ * 100 / MC1000_NE555_DUTY_CYCLE)) MCFG_TIMER_PARAM(ASSERT_LINE) /* video hardware */ MCFG_SCREEN_MC6847_PAL_ADD(SCREEN_TAG, MC6847_TAG) MCFG_MC6847_ADD(MC6847_TAG, MC6847_NTSC, XTAL_3_579545MHz, mc1000_mc6847_intf) /* sound hardware */ MCFG_SPEAKER_STANDARD_MONO("mono") MCFG_SOUND_ADD(AY8910_TAG, AY8910, 3579545/2) MCFG_SOUND_CONFIG(ay8910_intf) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) /* devices */ MCFG_CASSETTE_ADD(CASSETTE_TAG, mc1000_cassette_interface) MCFG_CENTRONICS_PRINTER_ADD(CENTRONICS_TAG, standard_centronics) /* internal ram */ MCFG_RAM_ADD(RAM_TAG) MCFG_RAM_DEFAULT_SIZE("16K") MCFG_RAM_EXTRA_OPTIONS("48K") MACHINE_CONFIG_END /* ROMs */ ROM_START( mc1000 ) ROM_REGION( 0x10000, Z80_TAG, 0 ) ROM_LOAD( "mc1000.ic17", 0xc000, 0x2000, CRC(8e78d80d) SHA1(9480270e67a5db2e7de8bc5c8b9e0bb210d4142b) ) ROM_LOAD( "mc1000.ic12", 0xe000, 0x2000, CRC(750c95f0) SHA1(fd766f5ea4481ef7fd4df92cf7d8397cc2b5a6c4) ) ROM_END /* Driver Initialization */ DIRECT_UPDATE_MEMBER(mc1000_state::mc1000_direct_update_handler) { if (m_rom0000) { if (address >= 0xc000) { membank("bank1")->set_entry(0); m_rom0000 = 0; } } return address; } DRIVER_INIT_MEMBER(mc1000_state,mc1000) { machine().device(Z80_TAG)->memory().space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(FUNC(mc1000_state::mc1000_direct_update_handler), this)); } /* System Drivers */ /* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */ COMP( 1985, mc1000, 0, 0, mc1000, mc1000, mc1000_state, mc1000, "CCE", "MC-1000", GAME_IMPERFECT_GRAPHICS | GAME_SUPPORTS_SAVE )