// license:BSD-3-Clause // copyright-holders:Robbbert /*************************************************************************** DG680 2013-01-14 Driver created All input must be in uppercase. DG680 (ETI-680), using the DGOS-Z80 operating system. This is a S100 card. In some ways, this system is the ancestor of the original Microbee. No schematic available, most of this is guesswork. Port 0 is the input from an ascii keyboard. Port 2 is the cassette interface. Port 8 controls some kind of memory protection scheme. The code indicates that B is the page to protect, and A is the code (0x08 = inhibit; 0x0B = unprotect; 0x0C = enable; 0x0E = protect). There are 256 pages so each page is 256 bytes. The clock is controlled by the byte in D80D. Monitor Commands: C (compare)* E (edit)* F (fill)* G - Go to address I - Inhibit CTC M (move)* P (clear screen)* R (read tape)* S (search)* T hhmm [ss] - Set the time W (write tape)* X - protection status XC - clear ram XD - same as X XE - enable facilities XF - disable facilities XP - protect block XU - unprotect block Z - go to 0000. * These commands are identical to the Microbee ones. ToDo: - dips - leds - need schematic to find out what else is missing ****************************************************************************/ #include "emu.h" #include "machine/keyboard.h" #include "machine/z80daisy.h" #include "cpu/z80/z80.h" #include "imagedev/cassette.h" #include "machine/clock.h" #include "machine/timer.h" #include "machine/z80ctc.h" #include "machine/z80pio.h" #include "bus/s100/s100.h" #include "bus/s100/dg640.h" #include "speaker.h" class dg680_state : public driver_device { public: dg680_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_cass(*this, "cassette") , m_pio(*this, "pio") , m_ctc(*this, "ctc") , m_clock(*this, "cass_clock") , m_s100(*this, "s100") { } void dg680(machine_config &config); private: u8 porta_r(); u8 portb_r(); void portb_w(u8 data); u8 port08_r(); void port08_w(u8 data); u8 mem_r(offs_t offset); void mem_w(offs_t offset, u8 data); DECLARE_WRITE_LINE_MEMBER(kansas_w); TIMER_DEVICE_CALLBACK_MEMBER(kansas_r); void kbd_put(u8 data); void io_map(address_map &map); void mem_map(address_map &map); void machine_reset() override; void machine_start() override; u8 m_pio_b; u8 m_term_data; u8 m_protection[0x100]; u8 m_cass_data[4]; bool m_cassold, m_cassinbit, m_cassoutbit; required_device m_maincpu; required_device m_cass; required_device m_pio; required_device m_ctc; required_device m_clock; required_device m_s100; }; WRITE_LINE_MEMBER( dg680_state::kansas_w ) { if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_RECORD) return; u8 twobit = m_cass_data[3] & 15; if (state) { if (twobit == 0) m_cassold = m_cassoutbit; if (m_cassold) 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 m_cass_data[3]++; } } TIMER_DEVICE_CALLBACK_MEMBER( dg680_state::kansas_r ) { // no tape - set to idle m_cass_data[1]++; if (m_cass_data[1] > 32) { m_cass_data[1] = 32; m_cassinbit = 1; } if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_PLAY) return; /* cassette - turn 1200/2400Hz to a bit */ u8 cass_ws = (m_cass->input() > +0.04) ? 1 : 0; if (cass_ws != m_cass_data[0]) { m_cass_data[0] = cass_ws; m_cassinbit = (m_cass_data[1] < 12) ? 1 : 0; m_cass_data[1] = 0; m_pio->pb0_w(m_cassinbit); } } u8 dg680_state::mem_r(offs_t offset) { return m_s100->smemr_r(offset + 0xf000); } void dg680_state::mem_w(offs_t offset, u8 data) { m_s100->mwrt_w(offset + 0xf000, data); } void dg680_state::mem_map(address_map &map) { map.unmap_value_high(); map(0x0000, 0xcfff).ram(); map(0xd000, 0xd7ff).rom().region("maincpu", 0); map(0xd800, 0xefff).ram(); map(0xf000, 0xffff).rw(FUNC(dg680_state::mem_r),FUNC(dg680_state::mem_w)); } void dg680_state::io_map(address_map &map) { map.unmap_value_high(); map.global_mask(0xff); map(0x00, 0x03).rw(m_pio, FUNC(z80pio_device::read_alt), FUNC(z80pio_device::write_alt)); map(0x04, 0x07).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write)); map(0x08, 0x08).rw(FUNC(dg680_state::port08_r), FUNC(dg680_state::port08_w)); //SWP Control and Status //map(0x09,0x09) parallel input port // Optional AM9519 Programmable Interrupt Controller (port c = data, port d = control) //map(0x0c,0x0d).rw("am9519", FUNC(am9519_device::read), FUNC(am9519_device::write)); } void dg680_state::machine_start() { save_item(NAME(m_pio_b)); save_item(NAME(m_term_data)); save_item(NAME(m_protection)); save_item(NAME(m_cass_data)); save_item(NAME(m_cassold)); save_item(NAME(m_cassinbit)); save_item(NAME(m_cassoutbit)); } void dg680_state::machine_reset() { m_maincpu->set_pc(0xd000); m_pio_b = 0xFF; } // this is a guess there is no information available static const z80_daisy_config dg680_daisy_chain[] = { { "ctc" }, { "pio" }, { 0x00 } }; /* Input ports */ static INPUT_PORTS_START( dg680 ) INPUT_PORTS_END void dg680_state::kbd_put(u8 data) { if (data == 8) data = 127; // fix backspace m_term_data = data; /* strobe in keyboard data */ m_pio->strobe_a(0); m_pio->strobe_a(1); } u8 dg680_state::porta_r() { u8 data = m_term_data; m_term_data = 0; return data; } u8 dg680_state::portb_r() { return m_pio_b | m_cassinbit; } // bit 1 = cassout; bit 2 = motor on void dg680_state::portb_w(u8 data) { if (BIT(m_pio_b ^ data, 2)) m_cass->change_state(BIT(data, 2) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR); m_pio_b = data & 0xfe; m_cassoutbit = BIT(data, 1); } u8 dg680_state::port08_r() { u8 breg = m_maincpu->state_int(Z80_B); return m_protection[breg]; } void dg680_state::port08_w(u8 data) { u8 breg = m_maincpu->state_int(Z80_B); m_protection[breg] = data; } static void dg680_s100_devices(device_slot_interface &device) { device.option_add("dg640", S100_DG640); } DEVICE_INPUT_DEFAULTS_START(dg680_dg640_f000) DEVICE_INPUT_DEFAULTS("DSW", 0x1f, 0x1e) // F000-F7FF DEVICE_INPUT_DEFAULTS_END void dg680_state::dg680(machine_config &config) { SPEAKER(config, "mono").front_center(); /* Cassette */ CASSETTE(config, m_cass); m_cass->set_default_state(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED); m_cass->add_route(ALL_OUTPUTS, "mono", 0.05); TIMER(config, "kansas_r").configure_periodic(FUNC(dg680_state::kansas_r), attotime::from_hz(40000)); CLOCK(config, m_clock, 4'800); // 300 baud x 16(divider) = 4800 m_clock->signal_handler().set(FUNC(dg680_state::kansas_w)); m_clock->signal_handler().append(m_ctc, FUNC(z80ctc_device::trg2)); m_clock->signal_handler().append(m_ctc, FUNC(z80ctc_device::trg3)); /* basic machine hardware */ z80_device& maincpu(Z80(config, m_maincpu, XTAL(8'000'000) / 4)); maincpu.set_addrmap(AS_PROGRAM, &dg680_state::mem_map); maincpu.set_addrmap(AS_IO, &dg680_state::io_map); maincpu.set_daisy_config(dg680_daisy_chain); /* Keyboard */ generic_keyboard_device &keyb(GENERIC_KEYBOARD(config, "keyb", 0)); keyb.set_keyboard_callback(FUNC(dg680_state::kbd_put)); /* Devices */ Z80CTC(config, m_ctc, XTAL(8'000'000) / 4); m_ctc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0); m_ctc->set_clk<0>(200); m_ctc->zc_callback<0>().set(m_ctc, FUNC(z80ctc_device::trg1)); Z80PIO(config, m_pio, XTAL(8'000'000) / 4); m_pio->out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0); m_pio->in_pa_callback().set(FUNC(dg680_state::porta_r)); // OUT_ARDY - this activates to ask for kbd data but not known if actually used m_pio->in_pb_callback().set(FUNC(dg680_state::portb_r)); m_pio->out_pb_callback().set(FUNC(dg680_state::portb_w)); S100_BUS(config, m_s100, 1_MHz_XTAL); S100_SLOT(config, "s100:1", dg680_s100_devices, "dg640") .set_option_device_input_defaults("dg640", DEVICE_INPUT_DEFAULTS_NAME(dg680_dg640_f000)); } /* ROM definition */ ROM_START( dg680 ) ROM_REGION( 0x0800, "maincpu", 0 ) ROM_LOAD( "dg680.rom", 0x0000, 0x0800, BAD_DUMP CRC(c1aaef6a) SHA1(1508ca8315452edfb984718e795ccbe79a0c0b58) ) ROM_REGION( 0x0020, "proms", 0 ) ROM_LOAD( "82s123.bin", 0x0000, 0x0020, NO_DUMP ) ROM_END /* Driver */ // YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS COMP( 1980, dg680, 0, 0, dg680, dg680, dg680_state, empty_init, "David Griffiths", "DG680 with DGOS-Z80 1.4", MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE )