// 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" 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: DECLARE_READ8_MEMBER( term_r ); DECLARE_WRITE8_MEMBER( term_w ); void kbd_put(u8 data); void mem_map(address_map &map); uint8_t m_term_data; virtual void machine_reset() override; required_device m_maincpu; required_device m_terminal; required_device m_fdc; required_device m_floppy0; }; READ8_MEMBER( d6809_state::term_r ) { uint8_t ret = m_term_data; m_term_data = 0; return ret; } WRITE8_MEMBER( d6809_state::term_w ) { 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_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_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 /* 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 )