diff options
Diffstat (limited to 'src/mess/drivers/mekd2.c')
-rw-r--r-- | src/mess/drivers/mekd2.c | 372 |
1 files changed, 372 insertions, 0 deletions
diff --git a/src/mess/drivers/mekd2.c b/src/mess/drivers/mekd2.c new file mode 100644 index 00000000000..658e7396b75 --- /dev/null +++ b/src/mess/drivers/mekd2.c @@ -0,0 +1,372 @@ +/****************************************************************************** + Motorola Evaluation Kit 6800 D2 + MEK6800D2 + + system driver + + Juergen Buchmueller <pullmoll@t-online.de>, Jan 2000 + + memory map + + range short description + 0000-00ff RAM 256 bytes RAM + 0100-01ff RAM optional 256 bytes RAM + 6000-63ff PROM optional PROM + or + 6000-67ff ROM optional ROM + 8004-8007 PIA expansion port + 8008-8009 ACIA cassette interface + 8020-8023 PIA keyboard interface + a000-a07f RAM 128 bytes RAM (JBUG scratch) + c000-c3ff PROM optional PROM + or + c000-c7ff ROM optional ROM + e000-e3ff ROM JBUG monitor program + e400-ffff -/- mirrors of monitor rom + + + TODO + - Cassette (it is extremely complex, with approx 10 chips) + - Proper artwork + +******************************************************************************/ + +#include "emu.h" +#include "cpu/m6800/m6800.h" +#include "machine/6821pia.h" +#include "machine/6850acia.h" +#include "imagedev/cassette.h" +#include "sound/wave.h" +#include "imagedev/cartslot.h" +#include "mekd2.lh" + +#define XTAL_MEKD2 1228800 + +class mekd2_state : public driver_device +{ +public: + mekd2_state(const machine_config &mconfig, device_type type, const char *tag) + : driver_device(mconfig, type, tag), + m_maincpu(*this, "maincpu"), + m_pia_s(*this, "pia_s"), + m_pia_u(*this, "pia_u"), + m_acia(*this, "acia") + { } + + required_device<cpu_device> m_maincpu; + required_device<device_t> m_pia_s; + required_device<device_t> m_pia_u; + required_device<device_t> m_acia; + DECLARE_READ_LINE_MEMBER( mekd2_key40_r ); + DECLARE_READ8_MEMBER( mekd2_key_r ); + DECLARE_WRITE_LINE_MEMBER( mekd2_nmi_w ); + DECLARE_WRITE8_MEMBER( mekd2_digit_w ); + DECLARE_WRITE8_MEMBER( mekd2_segment_w ); + UINT8 m_segment; + UINT8 m_digit; + UINT8 m_keydata; +}; + + + +/*********************************************************** + + Address Map + +************************************************************/ + +static ADDRESS_MAP_START( mekd2_mem , AS_PROGRAM, 8, mekd2_state) + AM_RANGE(0x0000, 0x00ff) AM_RAM // user ram + AM_RANGE(0x8004, 0x8007) AM_DEVREADWRITE("pia_u", pia6821_device, read, write) + AM_RANGE(0x8008, 0x8008) AM_DEVREADWRITE("acia", acia6850_device, status_read, control_write) + AM_RANGE(0x8009, 0x8009) AM_DEVREADWRITE("acia", acia6850_device, data_read, data_write) + AM_RANGE(0x8020, 0x8023) AM_DEVREADWRITE("pia_s", pia6821_device, read, write) + AM_RANGE(0xa000, 0xa07f) AM_RAM // system ram + AM_RANGE(0xe000, 0xe3ff) AM_ROM AM_MIRROR(0x1c00) /* JBUG ROM */ +ADDRESS_MAP_END + +/*********************************************************** + + Keys + +************************************************************/ + +/* + +Enter the 4 digit address then the command key: + + - M : Examine and Change Memory (example: E000M, then G to skip to next, H to exit) + - E : Escape (abort) operation (H key in our emulation) + - R : Examine Registers + - G : Begin execution at specified address + - P : Punch data from memory to magnetic tape + - L : Load memory from magnetic tape + - N : Trace one instruction + - V : Set (and remove) breakpoints + +The keys are laid out as: + + P L N V + + 7 8 9 A M + 4 5 6 B E + 1 2 3 C R + 0 F E D G + + */ +static INPUT_PORTS_START( mekd2 ) + PORT_START("X0") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E (hex)") PORT_CODE(KEYCODE_E) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) + + PORT_START("X1") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) + + PORT_START("X2") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) + + PORT_START("X3") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) + + PORT_START("X4") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V) + + PORT_START("X5") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E (escape)") PORT_CODE(KEYCODE_H) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G) +INPUT_PORTS_END + + +/*********************************************************** + + Trace hardware (what happens when N is pressed) + +************************************************************/ + +static TIMER_CALLBACK( mekd2_trace ) +{ + cputag_set_input_line(machine, "maincpu", INPUT_LINE_NMI, ASSERT_LINE); +} + +WRITE_LINE_MEMBER( mekd2_state::mekd2_nmi_w ) +{ + if (state) + cputag_set_input_line(machine(), "maincpu", INPUT_LINE_NMI, CLEAR_LINE); + else + machine().scheduler().timer_set(attotime::from_usec(18), FUNC(mekd2_trace)); +} + + + +/*********************************************************** + + Keyboard + +************************************************************/ + +READ_LINE_MEMBER( mekd2_state::mekd2_key40_r ) +{ + return BIT(m_keydata, 6); +} + +READ8_MEMBER( mekd2_state::mekd2_key_r ) +{ + char kbdrow[4]; + UINT8 i; + m_keydata = 0xff; + + for (i = 0; i < 6; i++) + { + if (BIT(m_digit, i)) + { + sprintf(kbdrow,"X%d",i); + m_keydata &= ioport(kbdrow)->read(); + } + } + + i = 0x80; + if (m_digit < 0x40) + i = BIT(m_keydata, 0) ? 0x80 : 0; + else + if (m_digit < 0x80) + i = BIT(m_keydata, 1) ? 0x80 : 0; + else + if (m_digit < 0xc0) + i = BIT(m_keydata, 2) ? 0x80 : 0; + else + i = BIT(m_keydata, 3) ? 0x80 : 0; + + return i | m_segment; +} + + + +/*********************************************************** + + LED display + +************************************************************/ + +WRITE8_MEMBER( mekd2_state::mekd2_segment_w ) +{ + m_segment = data & 0x7f; +} + +WRITE8_MEMBER( mekd2_state::mekd2_digit_w ) +{ + UINT8 i; + if (data < 0x3f) + { + for (i = 0; i < 6; i++) + { + if (BIT(data, i)) + output_set_digit_value(i, ~m_segment & 0x7f); + } + } + m_digit = data; +} + + + +/*********************************************************** + + Interfaces + +************************************************************/ + +static const pia6821_interface mekd2_s_mc6821_intf = +{ + DEVCB_DRIVER_MEMBER(mekd2_state, mekd2_key_r), /* port A input */ + DEVCB_NULL, /* port B input */ + DEVCB_NULL, /* CA1 input */ + DEVCB_DRIVER_LINE_MEMBER(mekd2_state, mekd2_key40_r), /* CB1 input */ + DEVCB_NULL, /* CA2 input */ + DEVCB_NULL, /* CB2 input */ + DEVCB_DRIVER_MEMBER(mekd2_state, mekd2_segment_w), /* port A output */ + DEVCB_DRIVER_MEMBER(mekd2_state, mekd2_digit_w), /* port B output */ + DEVCB_DRIVER_LINE_MEMBER(mekd2_state, mekd2_nmi_w), /* CA2 output */ + DEVCB_NULL, /* CB2 output */ + DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_NMI), /* IRQA output */ + DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_NMI) /* IRQB output */ +}; + +static const pia6821_interface mekd2_u_mc6821_intf = +{ + DEVCB_NULL, /* port A input */ + DEVCB_NULL, /* port B input */ + DEVCB_NULL, /* CA1 input */ + DEVCB_NULL, /* CB1 input */ + DEVCB_NULL, /* CA2 input */ + DEVCB_NULL, /* CB2 input */ + DEVCB_NULL, /* port A output */ + DEVCB_NULL, /* port B output */ + DEVCB_NULL, /* CA2 output */ + DEVCB_NULL, /* CB2 output */ + DEVCB_CPU_INPUT_LINE("maincpu", M6800_IRQ_LINE), /* IRQA output */ + DEVCB_CPU_INPUT_LINE("maincpu", M6800_IRQ_LINE) /* IRQB output */ +}; + +static ACIA6850_INTERFACE( mekd2_acia_intf ) +{ + XTAL_MEKD2 / 256, //connected to cassette circuit /* tx clock 4800Hz */ + XTAL_MEKD2 / 256, //connected to cassette circuit /* rx clock varies, controlled by cassette circuit */ + DEVCB_NULL,//LINE(cass),//connected to cassette circuit /* in rxd func */ + DEVCB_NULL,//LINE(cass),//connected to cassette circuit /* out txd func */ + DEVCB_NULL, /* in cts func */ + DEVCB_NULL, //connected to cassette circuit /* out rts func */ + DEVCB_NULL, /* in dcd func */ + DEVCB_NULL /* out irq func */ +}; + +static DEVICE_IMAGE_LOAD( mekd2_cart ) +{ + static const char magic[] = "MEK6800D2"; + char buff[9]; + UINT16 addr, size; + UINT8 ident, *RAM = image.device().machine().root_device().memregion("maincpu")->base(); + + image.fread( buff, sizeof (buff)); + if (memcmp(buff, magic, sizeof (buff))) + { + logerror( "mekd2_rom_load: magic '%s' not found\n", magic); + return IMAGE_INIT_FAIL; + } + image.fread( &addr, 2); + addr = LITTLE_ENDIANIZE_INT16(addr); + image.fread( &size, 2); + size = LITTLE_ENDIANIZE_INT16(size); + image.fread( &ident, 1); + logerror("mekd2_rom_load: $%04X $%04X $%02X\n", addr, size, ident); + while (size-- > 0) + image.fread( &RAM[addr++], 1); + + return IMAGE_INIT_PASS; +} + +/*********************************************************** + + Machine + +************************************************************/ + +static MACHINE_CONFIG_START( mekd2, mekd2_state ) + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu", M6800, XTAL_MEKD2 / 2) /* 614.4 kHz */ + MCFG_CPU_PROGRAM_MAP(mekd2_mem) + + MCFG_DEFAULT_LAYOUT(layout_mekd2) + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_WAVE_ADD(WAVE_TAG, CASSETTE_TAG) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) + + MCFG_CASSETTE_ADD( CASSETTE_TAG, default_cassette_interface ) + + /* Cartslot ?? does not come with one.. */ + MCFG_CARTSLOT_ADD("cart") + MCFG_CARTSLOT_EXTENSION_LIST("d2") + MCFG_CARTSLOT_NOT_MANDATORY + MCFG_CARTSLOT_LOAD(mekd2_cart) + + /* Devices */ + MCFG_PIA6821_ADD("pia_s", mekd2_s_mc6821_intf) + MCFG_PIA6821_ADD("pia_u", mekd2_u_mc6821_intf) + MCFG_ACIA6850_ADD("acia", mekd2_acia_intf) +MACHINE_CONFIG_END + +/*********************************************************** + + ROMS + +************************************************************/ + +ROM_START(mekd2) + ROM_REGION(0x10000,"maincpu",0) + ROM_LOAD("jbug.rom", 0xe000, 0x0400, CRC(5ed08792) SHA1(b06e74652a4c4e67c4a12ddc191ffb8c07f3332e) ) +ROM_END + +/*************************************************************************** + + Game driver(s) + +***************************************************************************/ + +/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME */ +CONS( 1977, mekd2, 0, 0, mekd2, mekd2, driver_device, 0, "Motorola", "MEK6800D2" , GAME_NOT_WORKING ) |