diff options
Diffstat (limited to 'src/mess/drivers/mc1000.c')
-rw-r--r-- | src/mess/drivers/mc1000.c | 508 |
1 files changed, 508 insertions, 0 deletions
diff --git a/src/mess/drivers/mc1000.c b/src/mess/drivers/mc1000.c new file mode 100644 index 00000000000..0258217508f --- /dev/null +++ b/src/mess/drivers/mc1000.c @@ -0,0 +1,508 @@ +/*************************************************************************** + + 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->memory().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->memory().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) /* % */ + +static TIMER_DEVICE_CALLBACK( ne555_tick ) +{ + mc1000_state *state = timer.machine().driver_data<mc1000_state>(); + + // (m_ne555_int not needed anymore and can be done with?) + state->m_ne555_int = param; + + state->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_ADD_PERIODIC("ne555clear", ne555_tick, attotime::from_hz(MC1000_NE555_FREQ)) + MCFG_TIMER_PARAM(CLEAR_LINE) + + MCFG_TIMER_ADD_PERIODIC("ne555assert", 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 ) |