diff options
Diffstat (limited to 'src/mess/drivers/h8.c')
-rw-r--r-- | src/mess/drivers/h8.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/src/mess/drivers/h8.c b/src/mess/drivers/h8.c new file mode 100644 index 00000000000..30b2515f6de --- /dev/null +++ b/src/mess/drivers/h8.c @@ -0,0 +1,256 @@ +/*************************************************************************** + + Heathkit H8 + + 12/05/2009 Skeleton driver. + + STATUS: + - It runs, keyboard works, you can enter data + + TODO: + - Proper artwork + - Fix interrupts + - Seems to crash when GO pressed (needs a subject-matter expert to test) + - Add load/dump facility (cassette port) + +****************************************************************************/ + +#include "emu.h" +#include "cpu/i8085/i8085.h" +#include "sound/beep.h" +#include "h8.lh" + +#define MACHINE_RESET_MEMBER(name) void name::machine_reset() + +class h8_state : public driver_device +{ +public: + h8_state(const machine_config &mconfig, device_type type, const char *tag) + : driver_device(mconfig, type, tag), + m_maincpu(*this, "maincpu"), + //m_cass(*this, CASSETTE_TAG), + m_beep(*this, BEEPER_TAG) + { } + + required_device<cpu_device> m_maincpu; + //required_device<cassette_image_device> m_cass; + required_device<device_t> m_beep; + DECLARE_READ8_MEMBER(h8_f0_r); + DECLARE_WRITE8_MEMBER(h8_f0_w); + DECLARE_WRITE8_MEMBER(h8_f1_w); + DECLARE_WRITE8_MEMBER(h8_status_callback); + DECLARE_WRITE_LINE_MEMBER(h8_inte_callback); + UINT8 m_digit; + UINT8 m_segment; + UINT8 m_irq_ctl; + UINT8 m_ff_b; + virtual void machine_reset(); +}; + + +#define H8_CLOCK (XTAL_12_288MHz / 6) +#define H8_BEEP_FRQ (H8_CLOCK / 1024) +#define H8_IRQ_PULSE (H8_BEEP_FRQ / 2) + + +static TIMER_DEVICE_CALLBACK( h8_irq_pulse ) +{ + h8_state *state = timer.machine().driver_data<h8_state>(); + if (state->m_irq_ctl & 1) + device_set_input_line_and_vector(timer.machine().device("maincpu"), INPUT_LINE_IRQ0, ASSERT_LINE, 0xcf); +} + +READ8_MEMBER( h8_state::h8_f0_r ) +{ + // reads the keyboard + + // The following not emulated, can occur any time even if keyboard not being scanned + // - if 0 and RTM pressed, causes int10 + // - if 0 and RST pressed, resets cpu + + UINT8 i,keyin,data = 0xff; + + keyin = ioport("X0")->read(); + if (keyin != 0xff) + { + for (i = 1; i < 8; i++) + if (!BIT(keyin,i)) + data &= ~(i<<1); + data &= 0xfe; + } + + keyin = ioport("X1")->read(); + if (keyin != 0xff) + { + for (i = 1; i < 8; i++) + if (!BIT(keyin,i)) + data &= ~(i<<5); + data &= 0xef; + } + return data; +} + +WRITE8_MEMBER( h8_state::h8_f0_w ) +{ + // this will always turn off int10 that was set by the timer + // d0-d3 = digit select + // d4 = int20 is allowed + // d5 = mon led + // d6 = int10 is allowed + // d7 = beeper enable + + m_digit = data & 15; + if (m_digit) output_set_digit_value(m_digit, m_segment); + + output_set_value("mon_led",(data & 0x20) ? 0 : 1); + beep_set_state(m_beep, (data & 0x80) ? 0 : 1); + + device_set_input_line(machine().device("maincpu"), INPUT_LINE_IRQ0, CLEAR_LINE); + m_irq_ctl &= 0xf0; + if (data & 0x40) m_irq_ctl |= 1; + if (~data & 0x10) m_irq_ctl |= 2; +} + +WRITE8_MEMBER( h8_state::h8_f1_w ) +{ + //d7 segment dot + //d6 segment f + //d5 segment e + //d4 segment d + //d3 segment c + //d2 segment b + //d1 segment a + //d0 segment g + + m_segment = 0xff ^ BITSWAP8(data, 7, 0, 6, 5, 4, 3, 2, 1); + if (m_digit) output_set_digit_value(m_digit, m_segment); +} + +static ADDRESS_MAP_START(h8_mem, AS_PROGRAM, 8, h8_state) + ADDRESS_MAP_UNMAP_HIGH + AM_RANGE(0x0000, 0x03ff) AM_ROM + AM_RANGE(0x2000, 0x9fff) AM_RAM +ADDRESS_MAP_END + +static ADDRESS_MAP_START( h8_io, AS_IO, 8, h8_state) + ADDRESS_MAP_UNMAP_HIGH + ADDRESS_MAP_GLOBAL_MASK(0xff) + AM_RANGE(0xf0, 0xf0) AM_READWRITE(h8_f0_r,h8_f0_w) + AM_RANGE(0xf1, 0xf1) AM_WRITE(h8_f1_w) + //AM_RANGE(0xf8, 0xf8) load and dump data port + //AM_RANGE(0xf9, 0xf9) load and dump control port + //AM_RANGE(0xfa, 0xfa) console data port + //AM_RANGE(0xfb, 0xfb) console control port +ADDRESS_MAP_END + +/* Input ports */ +static INPUT_PORTS_START( h8 ) + PORT_START("X0") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0') + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("1 SP") PORT_CODE(KEYCODE_1) PORT_CHAR('1') + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("2 AF") PORT_CODE(KEYCODE_2) PORT_CHAR('2') + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("3 BC") PORT_CODE(KEYCODE_3) PORT_CHAR('3') + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("4 DE GO") PORT_CODE(KEYCODE_4) PORT_CHAR('4') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("5 HL IN") PORT_CODE(KEYCODE_5) PORT_CHAR('5') + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("6 PC OUT") PORT_CODE(KEYCODE_6) PORT_CHAR('6') + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("7 SI") PORT_CODE(KEYCODE_7) PORT_CHAR('7') + + PORT_START("X1") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("8 LOAD") PORT_CODE(KEYCODE_8) PORT_CHAR('8') + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("9 DUMP") PORT_CODE(KEYCODE_9) PORT_CHAR('9') + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("+") PORT_CODE(KEYCODE_EQUALS) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("-") PORT_CODE(KEYCODE_MINUS) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("* CANCEL") PORT_CODE(KEYCODE_Q) + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("// ALTER RST") PORT_CODE(KEYCODE_W) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("# MEM RTM") PORT_CODE(KEYCODE_E) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("@ REG") PORT_CODE(KEYCODE_R) +INPUT_PORTS_END + +MACHINE_RESET_MEMBER(h8_state) +{ + beep_set_frequency(m_beep, H8_BEEP_FRQ); + output_set_value("pwr_led", 0); + m_irq_ctl = 1; +} + +WRITE_LINE_MEMBER( h8_state::h8_inte_callback ) +{ + // operate the ION LED + output_set_value("ion_led",(state) ? 0 : 1); + m_irq_ctl &= 0x7f | ((state) ? 0 : 0x80); +} + +WRITE8_MEMBER( h8_state::h8_status_callback ) +{ +/* This is rather messy, but basically there are 2 D flipflops, one drives the other, +the data is /INTE while the clock is /M1. If the system is in Single Instruction mode, +a int20 (output of 2nd flipflop) will occur after 4 M1 steps, to pause the running program. +But, all of this can only occur if bit 5 of port F0 is low. */ + + UINT8 state = (data & I8085_STATUS_M1) ? 0 : 1; + UINT8 c,a = (m_irq_ctl & 0x80) ? 1 : 0; + + if (m_irq_ctl & 2) + { + if (!state) // rising pulse to push data through flipflops + { + c=m_ff_b^1; // from /Q of 2nd flipflop + m_ff_b=a; // from Q of 1st flipflop + if (c) + device_set_input_line_and_vector(machine().device("maincpu"), INPUT_LINE_IRQ0, ASSERT_LINE, 0xd7); + } + } + else + { // flipflops are 'set' + c=0; + m_ff_b=1; + } + + + // operate the RUN LED + output_set_value("run_led", state); +} + +static I8085_CONFIG( h8_cpu_config ) +{ + DEVCB_DRIVER_MEMBER(h8_state, h8_status_callback), /* Status changed callback */ + DEVCB_DRIVER_LINE_MEMBER(h8_state, h8_inte_callback), /* INTE changed callback */ + DEVCB_NULL, /* SID changed callback (I8085A only) */ + DEVCB_NULL /* SOD changed callback (I8085A only) */ +}; + +static MACHINE_CONFIG_START( h8, h8_state ) + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu", I8080, H8_CLOCK) + MCFG_CPU_PROGRAM_MAP(h8_mem) + MCFG_CPU_IO_MAP(h8_io) + MCFG_CPU_CONFIG(h8_cpu_config) + + MCFG_TIMER_ADD_PERIODIC("h8_timer", h8_irq_pulse, attotime::from_hz(H8_IRQ_PULSE) ) + + /* video hardware */ + MCFG_DEFAULT_LAYOUT(layout_h8) + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD(BEEPER_TAG, BEEP, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) +MACHINE_CONFIG_END + +/* ROM definition */ +ROM_START( h8 ) + ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF ) + ROM_LOAD( "2708_444-13_pam8.rom", 0x0000, 0x0400, CRC(e0745513) SHA1(0e170077b6086be4e5cd10c17e012c0647688c39)) + + ROM_REGION( 0x10000, "otherroms", ROMREGION_ERASEFF ) + ROM_LOAD( "2708_444-13_pam8go.rom", 0x0000, 0x0400, CRC(9dbad129) SHA1(72421102b881706877f50537625fc2ab0b507752)) + ROM_LOAD( "2716_444-13_pam8at.rom", 0x0000, 0x0800, CRC(fd95ddc1) SHA1(eb1f272439877239f745521139402f654e5403af)) + ROM_LOAD( "2716_444-19_h17.rom", 0x0000, 0x0800, CRC(26e80ae3) SHA1(0c0ee95d7cb1a760f924769e10c0db1678f2435c)) + ROM_LOAD( "2732_444-70_xcon8.rom", 0x0000, 0x1000, CRC(b04368f4) SHA1(965244277a3a8039a987e4c3593b52196e39b7e7)) + ROM_LOAD( "2732_444-140_pam37.rom", 0x0000, 0x1000, CRC(53a540db) SHA1(90082d02ffb1d27e8172b11fff465bd24343486e)) +ROM_END + +/* Driver */ + +/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */ +COMP( 1977, h8, 0, 0, h8, h8, driver_device, 0, "Heath, Inc.", "Heathkit H8", GAME_NOT_WORKING ) |