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+// 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 )