// license:BSD-3-Clause // copyright-holders:Robbbert /******************************************************************************* 6809 Portable 12/05/2009 Skeleton driver. 21/09/2011 connected to terminal, notes added [Robbbert] Chips used: - 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 **********************************************************************************/ #include "emu.h" #include "cpu/m6809/m6809.h" #include "machine/mos6551.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") { } DECLARE_READ8_MEMBER( term_r ); DECLARE_WRITE8_MEMBER( term_w ); void kbd_put(u8 data); void d6809(machine_config &config); void mem_map(address_map &map); private: uint8_t m_term_data; virtual void machine_reset() override; required_device m_maincpu; required_device m_terminal; }; 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(space, 0, 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(0x00ff, 0x00ff).rw(this, FUNC(d6809_state::term_r), FUNC(d6809_state::term_w)); 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() { } MACHINE_CONFIG_START(d6809_state::d6809) /* basic machine hardware */ MCFG_DEVICE_ADD("maincpu", MC6809E, XTAL(14'745'600) / 8) // MC68B09EP MCFG_DEVICE_PROGRAM_MAP(mem_map) MCFG_DEVICE_ADD("acia1", MOS6551, XTAL(14'745'600) / 8) // uses Q clock MCFG_DEVICE_ADD("acia2", MOS6551, XTAL(14'745'600) / 8) // uses Q clock /* video hardware */ MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0) MCFG_GENERIC_TERMINAL_KEYBOARD_CB(PUT(d6809_state, kbd_put)) MACHINE_CONFIG_END /* 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 )