// license:BSD-3-Clause // copyright-holders:Robbbert /******************************************************************************** CREI680 trainer. This has 2 boards, the CPU board with the buttons, LEDs etc, and the video board. Like many machines of this era, the cassette circuit is grossly overcomplicated, using a 3301 op-amp, a 75140 line receiver and a bunch of CMOS logic ICs. Since the first of these (a 14040B) divides the E clock down to 300 * 16 to generate the ACIA's TXC input, the format can be assumed to be Kansas City. The schematic is missing some information, so we've guessed a few things. We don't have any instructions, user manual or anything - just the schematic. TODO: - Cassette to test when we find out how to use it. - Single-step circuit - Add paste facility, although it will be difficult with having to set each individual bit of each byte. If the byte already is non-zero, it won't know what to do. **********************************************************************************/ #include "emu.h" #include "cpu/m6800/m6800.h" #include "imagedev/cassette.h" #include "machine/6821pia.h" #include "machine/6850acia.h" #include "machine/clock.h" #include "machine/timer.h" #include "video/mc6845.h" #include "sound/beep.h" #include "emupal.h" #include "screen.h" #include "speaker.h" #include "crei680.lh" class crei680_state : public driver_device { public: crei680_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_pia0(*this, "pia0") , m_pia1(*this, "pia1") , m_uart(*this, "uart") , m_crtc(*this, "crtc") , m_vram(*this, "videoram") , m_cgen(*this, "chargen") , m_palette(*this, "palette") , m_beep(*this, "beeper") , m_leds(*this, "led%u", 0U) { } void crei680(machine_config &config); DECLARE_INPUT_CHANGED_MEMBER(reset_button); private: TIMER_DEVICE_CALLBACK_MEMBER(kansas_w); TIMER_DEVICE_CALLBACK_MEMBER(kansas_r); MC6845_UPDATE_ROW(crtc_update_row); void mem_map(address_map &map); void pia0b_w(u8); void pia1b_w(u8); void piaset_w(offs_t, u8); bool m_cassbit = 0; bool m_cassold = 0; u8 m_cass_data[4]{}; void machine_start() override; void machine_reset() override; required_device m_maincpu; required_device m_cass; required_device m_pia0; required_device m_pia1; required_device m_uart; required_device m_crtc; required_shared_ptr m_vram; required_region_ptr m_cgen; required_device m_palette; required_device m_beep; output_finder<8> m_leds; }; /* Memory Maps */ void crei680_state::mem_map(address_map &map) { map(0x0080, 0x017f).ram(); // mc6810 map(0x3000, 0x3fff).ram(); // 8x 2114 map(0xc004, 0xc007).rw(m_pia0, FUNC(pia6821_device::read), FUNC(pia6821_device::write)); map(0xc008, 0xc009).rw(m_uart, FUNC(acia6850_device::read), FUNC(acia6850_device::write)); map(0xc010, 0xc010).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w)); map(0xc011, 0xc011).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w)); map(0xc020, 0xc023).rw(m_pia1, FUNC(pia6821_device::read), FUNC(pia6821_device::write)); map(0xc024, 0xc027).w(FUNC(crei680_state::piaset_w)); map(0xd000, 0xd3ff).ram().share("videoram"); // 6x 2102 map(0xe000, 0xefff).rom().region("basic", 0); // 68A332 map(0xf000, 0xffff).rom().region("maincpu", 0); // 68A332 } /* Input Ports */ static INPUT_PORTS_START( crei680 ) PORT_START("X0") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_NAME("bit0") // toggle bit0 of data PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_NAME("bit1") // ...etc... PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_NAME("bit2") PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_NAME("bit3") PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_NAME("bit4") PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_NAME("bit5") PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_NAME("bit6") PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_NAME("bit7") PORT_START("X1") PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_R) PORT_NAME("REG") // Examine or set register PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_L) PORT_NAME("LAD") // Set low byte of address PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_H) PORT_NAME("HAD") // Set high byte of address PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_X) PORT_NAME("RUN") // Execute PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_DOWN) PORT_NAME("DEC") // Previous address or register PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_UP) PORT_NAME("INC") // Next address or register PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_EQUALS) PORT_NAME("DATA") // Switch between address and data modes PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNUSED ) PORT_START("RESET") PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RST") PORT_CODE(KEYCODE_LALT) PORT_CHANGED_MEMBER(DEVICE_SELF, crei680_state, reset_button, 0) INPUT_PORTS_END INPUT_CHANGED_MEMBER(crei680_state::reset_button) { if (newval) { m_pia0->reset(); m_pia1->reset(); } m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE); } /* Video */ /* F4 Character Displayer */ static const gfx_layout charlayout = { 8, 8, /* 8 x 8 characters */ 128, /* 64 characters */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 0, 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 }, 8*8 /* every char takes 16 bytes */ }; static GFXDECODE_START( gfx_crei680 ) GFXDECODE_ENTRY( "chargen", 0x0000, charlayout, 0, 1 ) GFXDECODE_END MC6845_UPDATE_ROW( crei680_state::crtc_update_row ) { rgb_t const *const palette = m_palette->palette()->entry_list_raw(); u32 *p = &bitmap.pix(y); for (u16 x = 0; x < x_count; x++) { u16 mem = (ma + x) & 0x3ff; u8 chr = m_vram[mem] & 0x3f; // video ram is 6 bit. if (chr < 0x20) chr |= 0x40; u8 gfx = (ra < 8) ? m_cgen[(chr<<3) | ra] : 0; /* Display a scanline of a character (6 pixels) */ *p++ = palette[BIT(gfx, 5)]; *p++ = palette[BIT(gfx, 4)]; *p++ = palette[BIT(gfx, 3)]; *p++ = palette[BIT(gfx, 2)]; *p++ = palette[BIT(gfx, 1)]; *p++ = palette[BIT(gfx, 0)]; } } TIMER_DEVICE_CALLBACK_MEMBER(crei680_state::kansas_w) { m_cass_data[3]++; if (m_cassbit != m_cassold) { m_cass_data[3] = 0; m_cassold = m_cassbit; } if (m_cassbit) 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(crei680_state::kansas_r) { /* cassette - turn 1200/2400Hz to a bit */ m_cass_data[1]++; u8 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; } } void crei680_state::pia0b_w(u8 data) { /* d0/1 = both low for beep d4 = cassette relay others are mystery circuits */ m_beep->set_state(BIT(data, 0, 2) ? 0 : 1); m_cass->change_state((BIT(data,4)) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR); } void crei680_state::pia1b_w(u8 data) { for (u8 i = 0; i < 8; i++) m_leds[i] = !BIT(data, i); } // The various devices in the cxxx range are selected by an address line. This means things clash // if 2 or more are selected at the same time. Normally this could be ignored, except that the // bootup sequence writes to the 2 PIAs at the same time in one particular instruction. void crei680_state::piaset_w(offs_t offset, u8 data) { m_pia0->write(offset, data); m_pia1->write(offset, data); } /* Machine Initialization */ void crei680_state::machine_start() { m_leds.resolve(); save_item(NAME(m_cassold)); save_item(NAME(m_cass_data)); save_item(NAME(m_cassbit)); } void crei680_state::machine_reset() { m_beep->set_state(0); m_cass_data[0] = 0; m_cass_data[1] = 0; m_cass_data[3] = 0; } /* Machine Drivers */ void crei680_state::crei680(machine_config &config) { /* basic machine hardware */ M6802(config, m_maincpu, 2.4576_MHz_XTAL); m_maincpu->set_addrmap(AS_PROGRAM, &crei680_state::mem_map); /* video hardware */ config.set_default_layout(layout_crei680); screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER)); screen.set_refresh_hz(50); screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); /* not accurate */ screen.set_size(640, 480); screen.set_visarea(0, 640-1, 0, 480-1); screen.set_screen_update("crtc", FUNC(mc6845_device::screen_update)); PALETTE(config, m_palette, palette_device::MONOCHROME); GFXDECODE(config, "gfxdecode", m_palette, gfx_crei680); MC6845(config, m_crtc, 5281920/6); m_crtc->set_screen("screen"); m_crtc->set_show_border_area(false); m_crtc->set_char_width(6); m_crtc->set_update_row_callback(FUNC(crei680_state::crtc_update_row)); /* sound hardware */ SPEAKER(config, "mono").front_center(); BEEP(config, "beeper", 900).add_route(ALL_OUTPUTS, "mono", 0.50); /* devices */ PIA6821(config, m_pia0, 0); m_pia0->readpa_handler().set_ioport("X1"); m_pia0->writepb_handler().set(FUNC(crei680_state::pia0b_w)); //m_pia0->cb2_handler().set(FUNC(crei680_state::screen_w)); m_pia0->irqa_handler().set_inputline("maincpu", M6800_IRQ_LINE); m_pia0->irqb_handler().set_inputline("maincpu", M6800_IRQ_LINE); PIA6821(config, m_pia1, 0); m_pia1->readpa_handler().set_ioport("X0"); m_pia1->writepb_handler().set(FUNC(crei680_state::pia1b_w)); //m_pia1->cb2_handler().set(FUNC(crei680_state::screen_w)); m_pia1->irqa_handler().set_inputline("maincpu", M6800_IRQ_LINE); m_pia1->irqb_handler().set_inputline("maincpu", M6800_IRQ_LINE); CASSETTE(config, m_cass); m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED); m_cass->add_route(ALL_OUTPUTS, "mono", 0.05); ACIA6850(config, m_uart, 0); m_uart->txd_handler().set([this] (bool state) { m_cassbit = state; }); //m_uart->rts_handler().set(FUNC(crei680_state::acia_rts_w)); m_uart->irq_handler().set_inputline("maincpu", M6800_IRQ_LINE); clock_device &acia_clock(CLOCK(config, "acia_clock", 2.4576_MHz_XTAL / 4 / 128)); acia_clock.signal_handler().set("uart", FUNC(acia6850_device::write_txc)); // connected directly acia_clock.signal_handler().append("uart", FUNC(acia6850_device::write_rxc)); // FIXME: modulated by RXD TIMER(config, "kansas_w").configure_periodic(FUNC(crei680_state::kansas_w), attotime::from_hz(4800)); TIMER(config, "kansas_r").configure_periodic(FUNC(crei680_state::kansas_r), attotime::from_hz(40000)); } /* ROMs */ ROM_START( crei680 ) ROM_REGION( 0x1000, "maincpu", 0 ) ROM_LOAD( "monitor.u19", 0x0000, 0x1000, CRC(0f95918e) SHA1(8cd675cc3a7b38ccd0975ef44f3e954d21711e0a) ) // cpu board ROM_REGION( 0x1000, "basic", 0 ) ROM_LOAD( "basic.u13", 0x0000, 0x1000, CRC(339d5557) SHA1(74763e6416a124dda5c18e6cfa71c4c6848c0ac9) ) // video board ROM_REGION( 0x0400, "chargen", 0 ) ROM_LOAD( "mcm6674p.u9", 0x0000, 0x0400, CRC(1c22088a) SHA1(b5f0bd0cfdec0cd5c1cb764506bef3c17d6af0eb) ) // video board ROM_END // YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS COMP( 19??, crei680, 0, 0, crei680, crei680, crei680_state, empty_init, "Capital Radio Engineering Institute", "CREI 680", MACHINE_SUPPORTS_SAVE )