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Diffstat (limited to 'src/mame/drivers/h8.cpp')
-rw-r--r-- | src/mame/drivers/h8.cpp | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/src/mame/drivers/h8.cpp b/src/mame/drivers/h8.cpp new file mode 100644 index 00000000000..9838ad98100 --- /dev/null +++ b/src/mame/drivers/h8.cpp @@ -0,0 +1,368 @@ +// license:BSD-3-Clause +// copyright-holders:Robbbert +/*************************************************************************** + + Heathkit H8 + + 2009-05-12 Skeleton driver. + + This system uses Octal rather than the usual hexadecimal. + +STATUS: + It runs, keyboard works, you can enter data. + +Meaning of LEDs: + PWR = power is turned on + MON = controls should work + RUN = CPU is running (not halted) + ION = Interrupts are enabled + +Pasting: + 0-F : as is + + : ^ + - : V + MEM : - + ALTER : = + + Addresses must have all 6 digits entered. + Data must have all 3 digits entered. + System has a short beep for each key, and a slightly longer beep + for each group of 3 digits. The largest number allowed is 377 (=0xFF). + +Test Paste: + -041000=123 245 333 144 255 366 077=-041000 + Now press up-arrow to confirm the data has been entered. + +Official test program from pages 4 to 8 of the operator's manual: + -040100=076 002 062 010 040 006 004 041 170 040 021 013 040 016 011 176 + 022 043 023 015 302 117 040 016 003 076 377 315 053 000 015 302 + 131 040 005 302 112 040 076 062 315 140 002 076 062 315 053 000 + 076 062 315 140 002 303 105 040 377 262 270 272 275 377 222 200 + 377 237 244 377 272 230 377 220 326 302 377 275 272 271 271 373 + 271 240 377 236 376 362 236 376 362 236 376 362 R6=040100=4 + +TODO: + - Cassette (coded but not working) + +****************************************************************************/ + +#include "emu.h" +#include "cpu/i8085/i8085.h" +#include "machine/i8251.h" +#include "machine/clock.h" +#include "imagedev/cassette.h" +#include "sound/beep.h" +#include "sound/wave.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_uart(*this, "uart"), + m_cass(*this, "cassette"), + m_beep(*this, "beeper") + { } + + DECLARE_READ8_MEMBER(portf0_r); + DECLARE_WRITE8_MEMBER(portf0_w); + DECLARE_WRITE8_MEMBER(portf1_w); + DECLARE_WRITE8_MEMBER(h8_status_callback); + DECLARE_WRITE_LINE_MEMBER(h8_inte_callback); + DECLARE_WRITE_LINE_MEMBER(txdata_callback); + DECLARE_WRITE_LINE_MEMBER(write_cassette_clock); + TIMER_DEVICE_CALLBACK_MEMBER(h8_irq_pulse); + TIMER_DEVICE_CALLBACK_MEMBER(h8_c); + TIMER_DEVICE_CALLBACK_MEMBER(h8_p); +private: + UINT8 m_digit; + UINT8 m_segment; + UINT8 m_irq_ctl; + bool m_ff_b; + UINT8 m_cass_data[4]; + bool m_cass_state; + bool m_cassold; + virtual void machine_reset(); + required_device<cpu_device> m_maincpu; + required_device<i8251_device> m_uart; + required_device<cassette_image_device> m_cass; + required_device<beep_device> m_beep; +}; + + +#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) + m_maincpu->set_input_line_and_vector(INPUT_LINE_IRQ0, ASSERT_LINE, 0xcf); +} + +READ8_MEMBER( h8_state::portf0_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::portf0_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", !BIT(data, 5)); + m_beep->set_state(!BIT(data, 7)); + + m_maincpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE); + m_irq_ctl &= 0xf0; + if (BIT(data, 6)) m_irq_ctl |= 1; + if (!BIT(data, 4)) m_irq_ctl |= 2; +} + +WRITE8_MEMBER( h8_state::portf1_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, 0x0fff) AM_ROM // main rom + AM_RANGE(0x1400, 0x17ff) AM_RAM // fdc ram + AM_RANGE(0x1800, 0x1fff) AM_ROM // fdc rom + AM_RANGE(0x2000, 0x9fff) AM_RAM // main 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(portf0_r,portf0_w) + AM_RANGE(0xf1, 0xf1) AM_WRITE(portf1_w) + AM_RANGE(0xf8, 0xf8) AM_DEVREADWRITE("uart", i8251_device, data_r, data_w) + AM_RANGE(0xf9, 0xf9) AM_DEVREADWRITE("uart", i8251_device, status_r, control_w) + // optional connection to a serial terminal @ 600 baud + //AM_RANGE(0xfa, 0xfa) AM_DEVREADWRITE("uart1", i8251_device, data_r, data_w) + //AM_RANGE(0xfb, 0xfb) AM_DEVREADWRITE("uart1", i8251_device, status_r, control_w) +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_UP) PORT_CHAR('^') + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("-") PORT_CODE(KEYCODE_DOWN) PORT_CHAR('V') + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CANCEL") PORT_CODE(KEYCODE_ESC) PORT_CHAR('Q') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("ALTER") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('=') + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("MEM") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("REG") PORT_CODE(KEYCODE_R) PORT_CHAR('R') +INPUT_PORTS_END + +void h8_state::machine_reset() +{ + m_beep->set_frequency(H8_BEEP_FRQ); + output_set_value("pwr_led", 0); + m_irq_ctl = 1; + m_cass_state = 1; + m_cass_data[0] = 0; + m_cass_data[1] = 0; + m_uart->write_rxd(0); + m_cass_data[3] = 0; + m_ff_b = 1; +} + +WRITE_LINE_MEMBER( h8_state::h8_inte_callback ) +{ + // operate the ION LED + output_set_value("ion_led", !state); + 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. */ + + bool state = (data & I8085_STATUS_M1) ? 0 : 1; + bool 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; // from /Q of 2nd flipflop + m_ff_b = a; // from Q of 1st flipflop + if (c) + m_maincpu->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); +} + +WRITE_LINE_MEMBER( h8_state::txdata_callback ) +{ + m_cass_state = state; +} + +WRITE_LINE_MEMBER( h8_state::write_cassette_clock ) +{ + m_uart->write_txc(state); + m_uart->write_rxc(state); +} + +TIMER_DEVICE_CALLBACK_MEMBER(h8_state::h8_c) +{ + m_cass_data[3]++; + + if (m_cass_state != m_cassold) + { + m_cass_data[3] = 0; + m_cassold = m_cass_state; + } + + if (m_cass_state) + m_cass->output(BIT(m_cass_data[3], 0) ? -1.0 : +1.0); // 2400Hz + else + m_cass->output(BIT(m_cass_data[3], 1) ? -1.0 : +1.0); // 1200Hz +} + +TIMER_DEVICE_CALLBACK_MEMBER(h8_state::h8_p) +{ + /* cassette - turn 1200/2400Hz to a bit */ + m_cass_data[1]++; + UINT8 cass_ws = (m_cass->input() > +0.03) ? 1 : 0; + + if (cass_ws != m_cass_data[0]) + { + m_cass_data[0] = cass_ws; + m_uart->write_rxd((m_cass_data[1] < 12) ? 1 : 0); + m_cass_data[1] = 0; + } +} + +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_I8085A_STATUS(WRITE8(h8_state, h8_status_callback)) + MCFG_I8085A_INTE(WRITELINE(h8_state, h8_inte_callback)) + + /* video hardware */ + MCFG_DEFAULT_LAYOUT(layout_h8) + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD("beeper", BEEP, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) + MCFG_SOUND_WAVE_ADD(WAVE_TAG, "cassette") + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) + + /* Devices */ + MCFG_DEVICE_ADD("uart", I8251, 0) + MCFG_I8251_TXD_HANDLER(WRITELINE(h8_state, txdata_callback)) + + MCFG_DEVICE_ADD("cassette_clock", CLOCK, 4800) + MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(h8_state, write_cassette_clock)) + + MCFG_CASSETTE_ADD("cassette") + MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_PLAY | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED) + MCFG_CASSETTE_INTERFACE("h8_cass") + + MCFG_TIMER_DRIVER_ADD_PERIODIC("h8_c", h8_state, h8_c, attotime::from_hz(4800)) + MCFG_TIMER_DRIVER_ADD_PERIODIC("h8_p", h8_state, h8_p, attotime::from_hz(40000)) + MCFG_TIMER_DRIVER_ADD_PERIODIC("h8_timer", h8_state, h8_irq_pulse, attotime::from_hz(H8_IRQ_PULSE)) +MACHINE_CONFIG_END + +/* ROM definition */ +ROM_START( h8 ) + ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF ) + // H17 fdc bios - needed by bios2&3 + ROM_LOAD( "2716_444-19_h17.rom", 0x1800, 0x0800, CRC(26e80ae3) SHA1(0c0ee95d7cb1a760f924769e10c0db1678f2435c)) + + ROM_SYSTEM_BIOS(0, "bios0", "Standard") + ROMX_LOAD( "2708_444-13_pam8.rom", 0x0000, 0x0400, CRC(e0745513) SHA1(0e170077b6086be4e5cd10c17e012c0647688c39), ROM_BIOS(1) ) + + ROM_SYSTEM_BIOS(1, "bios1", "Alternate") + ROMX_LOAD( "2708_444-13_pam8go.rom", 0x0000, 0x0400, CRC(9dbad129) SHA1(72421102b881706877f50537625fc2ab0b507752), ROM_BIOS(2) ) + + ROM_SYSTEM_BIOS(2, "bios2", "Disk OS") + ROMX_LOAD( "2716_444-13_pam8at.rom", 0x0000, 0x0800, CRC(fd95ddc1) SHA1(eb1f272439877239f745521139402f654e5403af), ROM_BIOS(3) ) + + ROM_SYSTEM_BIOS(3, "bios3", "Disk OS Alt") + ROMX_LOAD( "2732_444-70_xcon8.rom", 0x0000, 0x1000, CRC(b04368f4) SHA1(965244277a3a8039a987e4c3593b52196e39b7e7), ROM_BIOS(4) ) + + // this one runs off into the weeds + ROM_SYSTEM_BIOS(4, "bios4", "not working") + ROMX_LOAD( "2732_444-140_pam37.rom", 0x0000, 0x1000, CRC(53a540db) SHA1(90082d02ffb1d27e8172b11fff465bd24343486e), ROM_BIOS(5) ) +ROM_END + +/* Driver */ + +/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS, INIT COMPANY FULLNAME FLAGS */ +COMP( 1977, h8, 0, 0, h8, h8, driver_device, 0, "Heath, Inc.", "Heathkit H8", MACHINE_NOT_WORKING ) |