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+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/*******************************************************************************
+
+Dunfield 6809 Portable
+
+2009-05-12 Skeleton driver.
+2011-09-21 connected to terminal, notes added [Robbbert]
+
+Chips used (planned?):
+- 6809E CPU
+- 6845 CRTC
+- 6840 CTC
+- 6551 ACIA Console
+- 6551 ACIA Aux
+- 6850 ACIA Unknown purpose
+- uPD765 FDC
+- 2764 8K ROM for CPU
+- 2732 4K ROM for Chargen (not dumped)
+- 6x 6264 RAM
+- 3x 5516 RAM
+- XTALs: 14.745MHz, 16MHz
+
+So much for the official documentation.
+
+In practice, it reads/writes to a terminal, and doesn't use most of the other
+devices.
+
+'maincpu' (F9DD): unmapped program memory write to 00F0 = 05 & FF
+'maincpu' (F9E3): unmapped program memory read from 0001 & FF <----- these 2 are CLR 0001
+'maincpu' (F9E3): unmapped program memory write to 0001 = 00 & FF
+'maincpu' (F9E6): unmapped program memory read from 0005 & FF <----- these 2 are CLR 0005
+'maincpu' (F9E6): unmapped program memory write to 0005 = 00 & FF
+'maincpu' (F9E9): unmapped program memory write to 0002 = 0B & FF <-- these 2 are STD 0002
+'maincpu' (F9E9): unmapped program memory write to 0003 = 1E & FF
+'maincpu' (F9EC): unmapped program memory write to 0006 = 0B & FF <-- these 2 are STD 0006
+'maincpu' (F9EC): unmapped program memory write to 0007 = 1E & FF
+'maincpu' (FA4D): unmapped program memory write to 00F2 = 00 & FF <-- the remainder seems to be disk related
+'maincpu' (FA52): unmapped program memory write to 00F3 = 00 & FF
+'maincpu' (FA57): unmapped program memory write to 00F4 = 00 & FF
+'maincpu' (FA5C): unmapped program memory write to 00F5 = 00 & FF
+'maincpu' (FA61): unmapped program memory write to 00F6 = 02 & FF
+'maincpu' (FA66): unmapped program memory write to 00F7 = 09 & FF
+'maincpu' (FA6B): unmapped program memory write to 00F0 = 01 & FF
+'maincpu' (FA6E): unmapped program memory read from 00F0 & FF
+'maincpu' (FA4D): unmapped program memory write to 00F2 = 00 & FF
+'maincpu' (FA52): unmapped program memory write to 00F3 = 00 & FF
+'maincpu' (FA57): unmapped program memory write to 00F4 = 00 & FF
+'maincpu' (FA5C): unmapped program memory write to 00F5 = 00 & FF
+'maincpu' (FA61): unmapped program memory write to 00F6 = 02 & FF
+'maincpu' (FA66): unmapped program memory write to 00F7 = 09 & FF
+'maincpu' (FA6B): unmapped program memory write to 00F0 = 01 & FF
+'maincpu' (FA6E): unmapped program memory read from 00F0 & FF
+'maincpu' (FA4D): unmapped program memory write to 00F2 = 00 & FF
+'maincpu' (FA52): unmapped program memory write to 00F3 = 00 & FF
+'maincpu' (FA57): unmapped program memory write to 00F4 = 00 & FF
+'maincpu' (FA5C): unmapped program memory write to 00F5 = 00 & FF
+'maincpu' (FA61): unmapped program memory write to 00F6 = 02 & FF
+'maincpu' (FA66): unmapped program memory write to 00F7 = 09 & FF
+'maincpu' (FA6B): unmapped program memory write to 00F0 = 01 & FF
+'maincpu' (FA6E): unmapped program memory read from 00F0 & FF
+'maincpu' (FA41): unmapped program memory write to 00F2 = 00 & FF
+'maincpu' (FA46): unmapped program memory write to 00F0 = 04 & FF
+'maincpu' (FA82): unmapped program memory read from 00F0 & FF
+'maincpu' (FA4D): unmapped program memory write to 00F2 = 00 & FF
+'maincpu' (FA52): unmapped program memory write to 00F3 = 00 & FF
+'maincpu' (FA57): unmapped program memory write to 00F4 = 00 & FF
+'maincpu' (FA5C): unmapped program memory write to 00F5 = 00 & FF
+'maincpu' (FA61): unmapped program memory write to 00F6 = 02 & FF
+'maincpu' (FA66): unmapped program memory write to 00F7 = 09 & FF
+'maincpu' (FA6B): unmapped program memory write to 00F0 = 01 & FF
+'maincpu' (FA6E): unmapped program memory read from 00F0 & FF
+'maincpu' (FA4D): unmapped program memory write to 00F2 = 00 & FF
+'maincpu' (FA52): unmapped program memory write to 00F3 = 00 & FF
+'maincpu' (FA57): unmapped program memory write to 00F4 = 00 & FF
+'maincpu' (FA5C): unmapped program memory write to 00F5 = 00 & FF
+'maincpu' (FA61): unmapped program memory write to 00F6 = 02 & FF
+'maincpu' (FA66): unmapped program memory write to 00F7 = 09 & FF
+'maincpu' (FA6B): unmapped program memory write to 00F0 = 01 & FF
+'maincpu' (FA6E): unmapped program memory read from 00F0 & FF <-- now it gives up & prints an error
+
+
+Layout of devices differences:
+ Schematic Actual
+6551 1 0000 0000
+6551 2 0100 0004
+Disk status 0400 00F0
+Disk commands 0401 00F0-00F7
+Parallel terminal not there 00FF
+CE on UPD765 0400 0200
+TC on UPD765 0500 0300
+
+Also, pins 16,17,18 on the UPD765 are incorrect in the schematic.
+
+
+ToDo:
+- Need better documentation
+- Need a boot disk image
+
+**********************************************************************************/
+
+#include "emu.h"
+#include "cpu/m6809/m6809.h"
+#include "imagedev/floppy.h"
+#include "machine/mos6551.h"
+#include "machine/upd765.h"
+#include "machine/terminal.h"
+
+
+namespace {
+
+class d6809_state : public driver_device
+{
+public:
+ d6809_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_terminal(*this, "terminal")
+ , m_fdc(*this, "fdc")
+ , m_floppy0(*this, "fdc:0")
+ { }
+
+ void d6809(machine_config &config);
+
+private:
+ u8 term_r();
+ void term_w(u8 data);
+ void kbd_put(u8 data);
+
+ void mem_map(address_map &map) ATTR_COLD;
+
+ u8 m_term_data = 0U;
+ void machine_start() override ATTR_COLD;
+ void machine_reset() override ATTR_COLD;
+ required_device<cpu_device> m_maincpu;
+ required_device<generic_terminal_device> m_terminal;
+ required_device<upd765a_device> m_fdc;
+ required_device<floppy_connector> m_floppy0;
+};
+
+u8 d6809_state::term_r()
+{
+ u8 ret = m_term_data;
+ m_term_data = 0;
+ return ret;
+}
+
+void d6809_state::term_w(u8 data)
+{
+ if ((data > 0) && (data < 0x80))
+ m_terminal->write(data);
+}
+
+void d6809_state::mem_map(address_map &map)
+{
+ map.unmap_value_high();
+ // 00-FF is for various devices.
+ map(0x0000, 0x0003).rw("acia1", FUNC(mos6551_device::read), FUNC(mos6551_device::write));
+ map(0x0004, 0x0007).rw("acia2", FUNC(mos6551_device::read), FUNC(mos6551_device::write));
+ map(0x00f0, 0x00f7).ram(); // for now
+ //map(0x00f0, 0x00f0).r(m_fdc, FUNC(upd765a_device::msr_r));
+ map(0x00ff, 0x00ff).rw(FUNC(d6809_state::term_r), FUNC(d6809_state::term_w));
+ map(0x0200, 0x0201).mirror(0xfe).m(m_fdc, FUNC(upd765a_device::map));
+ map(0x0300, 0x0300).mirror(0xff).lw8(NAME([this] (u8 data){ m_fdc->tc_w(1); m_fdc->tc_w(0); }));
+ map(0x1000, 0xdfff).ram();
+ map(0xe000, 0xffff).rom().region("roms", 0);
+}
+
+
+/* Input ports */
+static INPUT_PORTS_START( d6809 )
+INPUT_PORTS_END
+
+
+void d6809_state::kbd_put(u8 data)
+{
+ m_term_data = data;
+}
+
+void d6809_state::machine_start()
+{
+ save_item(NAME(m_term_data));
+}
+
+void d6809_state::machine_reset()
+{
+ m_fdc->set_ready_line_connected(1);
+ m_fdc->set_unscaled_clock(8_MHz_XTAL / 2); // 4MHz for minifloppy
+ floppy_image_device *floppy = m_floppy0->get_device();
+ m_fdc->set_floppy(floppy);
+ floppy->mon_w(0);
+}
+
+static void floppies(device_slot_interface &device)
+{
+ device.option_add("525qd", FLOPPY_525_QD);
+}
+
+
+void d6809_state::d6809(machine_config &config)
+{
+ /* basic machine hardware */
+ MC6809E(config, m_maincpu, XTAL(14'745'600) / 8); // MC68B09EP
+ m_maincpu->set_addrmap(AS_PROGRAM, &d6809_state::mem_map);
+
+ MOS6551(config, "acia1", XTAL(14'745'600) / 8); // uses Q clock
+ MOS6551(config, "acia2", XTAL(14'745'600) / 8); // uses Q clock
+
+ /* video hardware */
+ GENERIC_TERMINAL(config, m_terminal, 0);
+ m_terminal->set_keyboard_callback(FUNC(d6809_state::kbd_put));
+
+ // Floppy
+ UPD765A(config, m_fdc, 8'000'000, true, true);
+ //m_fdc->drq_wr_callback().set(m_fdc, FUNC(upd765a_device::dack_w)); // pin not emulated
+ FLOPPY_CONNECTOR(config, "fdc:0", floppies, "525qd", floppy_image_device::default_mfm_floppy_formats).enable_sound(true);
+}
+
+/* ROM definition */
+ROM_START( d6809 )
+ ROM_REGION( 0x2000, "roms", 0 )
+ ROM_LOAD( "d6809.rom", 0x0000, 0x2000, CRC(2ceb40b8) SHA1(780111541234b4f0f781a118d955df61daa56e7e))
+ROM_END
+
+} // anonymous namespace
+
+
+/* Driver */
+
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
+COMP( 1983, d6809, 0, 0, d6809, d6809, d6809_state, empty_init, "Dunfield", "6809 Portable", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE )