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+// 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] = { 0, };
+ void machine_start() override;
+ void machine_reset() override;
+ required_device<cpu_device> m_maincpu;
+ required_device<cassette_image_device> m_cass;
+ required_device<pia6821_device> m_pia0;
+ required_device<pia6821_device> m_pia1;
+ required_device<acia6850_device> m_uart;
+ required_device<mc6845_device> m_crtc;
+ required_shared_ptr<u8> m_vram;
+ required_region_ptr<u8> m_cgen;
+ required_device<palette_device> m_palette;
+ required_device<beep_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 )