/*************************************************************************** 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" 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 m_maincpu; //required_device m_cass; required_device 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(); TIMER_DEVICE_CALLBACK_MEMBER(h8_irq_pulse); }; #define H8_CLOCK (XTAL_12_288MHz / 6) #define H8_BEEP_FRQ (H8_CLOCK / 1024) #define H8_IRQ_PULSE (H8_BEEP_FRQ / 2) TIMER_DEVICE_CALLBACK_MEMBER(h8_state::h8_irq_pulse) { if (m_irq_ctl & 1) machine().device("maincpu")->execute().set_input_line_and_vector(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); machine().device("maincpu")->execute().set_input_line(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 void h8_state::machine_reset() { 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) machine().device("maincpu")->execute().set_input_line_and_vector(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_DRIVER_ADD_PERIODIC("h8_timer", h8_state, 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 )