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mame/src/mess/drivers/mc1000.c

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/***************************************************************************
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(MC6845_TAG, mc6845_device, address_w)
// AM_RANGE(0x11, 0x11) AM_DEVREADWRITE(MC6845_TAG, mc6845_device, register_r, register_w)
AM_RANGE(0x12, 0x12) AM_WRITE(mc6845_ctrl_w)
AM_RANGE(0x20, 0x20) AM_DEVWRITE(AY8910_TAG, ay8910_device, address_w)
AM_RANGE(0x40, 0x40) AM_DEVREAD(AY8910_TAG, ay8910_device, data_r)
AM_RANGE(0x60, 0x60) AM_DEVWRITE(AY8910_TAG, ay8910_device, 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("Y0")
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("Y1")
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("Y2")
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("Y3")
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("Y4")
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("Y5")
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("Y6")
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("Y7")
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 &= m_y0->read();
if (m_joybkeymap->read()) data &= m_joyb->read();
}
if (!BIT(m_keylatch, 1))
{
data &= m_y1->read();
if (m_joyakeymap->read()) data &= m_joya->read();
}
if (!BIT(m_keylatch, 2)) data &= m_y2->read();
if (!BIT(m_keylatch, 3)) data &= m_y3->read();
if (!BIT(m_keylatch, 4)) data &= m_y4->read();
if (!BIT(m_keylatch, 5)) data &= m_y5->read();
if (!BIT(m_keylatch, 6)) data &= m_y6->read();
if (!BIT(m_keylatch, 7)) data &= m_y7->read();
data = (m_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 = m_rom->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", 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)
{
m_maincpu->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 )
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