summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/mc1000.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/drivers/mc1000.c')
-rw-r--r--src/mame/drivers/mc1000.c502
1 files changed, 502 insertions, 0 deletions
diff --git a/src/mame/drivers/mc1000.c b/src/mame/drivers/mc1000.c
new file mode 100644
index 00000000000..defef2a94c0
--- /dev/null
+++ b/src/mame/drivers/mc1000.c
@@ -0,0 +1,502 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/***************************************************************************
+
+ 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 */
+
+WRITE_LINE_MEMBER( mc1000_state::write_centronics_busy )
+{
+ m_centronics_busy = state;
+}
+
+READ8_MEMBER( mc1000_state::printer_r )
+{
+ return m_centronics_busy;
+}
+
+WRITE8_MEMBER( mc1000_state::printer_w )
+{
+ m_centronics->write_strobe(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("cent_data_out", output_latch_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->get_state() & CASSETTE_MASK_UISTATE) == CASSETTE_PLAY)
+ {
+ if (m_cassette->input() >= +0.0) data &= 0x7f;
+ }
+
+ return data;
+}
+
+/* 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+
+ | | |
+ +-+ | |
+ | |390K | |
+ | |R17 |8 |4
+ +-+ +-------+
+ | 7| |3
+ *-------| |-------> /INT (Z80)
+ | | |
+ | | |
+ +-+R16 2| IC 28 |
+ | |1K +--| |
+ | | | | 555 |
+ +-+ | | |
+ | | 6| |5
+ *----*--| |---+
+ | | | |
+ ---C30 +-------+ ---C29
+ ---10n |1 ---10n
+ _|_ _|_ _|_
+ /// /// ///
+
+ Calculated properties:
+
+ * 99.74489795918367 Duty Cycle Percentage
+ * 367.3469387755102 Frequency in Hertz
+ * 0.00000693 Seconds Low
+ * 0.00270963 Seconds High
+
+ */
+
+#define MC1000_NE555_FREQ (367) /* 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 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_DEVICE_ADD(MC6847_TAG, MC6847_NTSC, XTAL_3_579545MHz)
+ MCFG_MC6847_HSYNC_CALLBACK(WRITELINE(mc1000_state, hs_w))
+ MCFG_MC6847_FSYNC_CALLBACK(WRITELINE(mc1000_state, fs_w))
+ MCFG_MC6847_INPUT_CALLBACK(READ8(mc1000_state, videoram_r))
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD(AY8910_TAG, AY8910, 3579545/2)
+ MCFG_AY8910_OUTPUT_TYPE(AY8910_SINGLE_OUTPUT)
+ MCFG_AY8910_RES_LOADS(RES_K(2.2), 0, 0)
+ MCFG_AY8910_PORT_B_READ_CB(READ8(mc1000_state, keydata_r))
+ MCFG_AY8910_PORT_A_WRITE_CB(WRITE8(mc1000_state, keylatch_w))
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
+
+ /* devices */
+ MCFG_CASSETTE_ADD("cassette")
+ MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED)
+
+ MCFG_SOFTWARE_LIST_ADD("cass_list", "mc1000_cass")
+
+ MCFG_CENTRONICS_ADD(CENTRONICS_TAG, centronics_devices, "printer")
+ MCFG_CENTRONICS_BUSY_HANDLER(WRITELINE(mc1000_state, write_centronics_busy))
+
+ MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", CENTRONICS_TAG)
+
+ /* 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", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )