// license:BSD-3-Clause // copyright-holders:Barry Rodewald, Robbbert /* Gimix 6809-Based Computers Representative group of GIMIX users included: Government Research and Scientific Organizations, Universities, Industrial, Computer Mainframe and Peripheral Manufacturers and Software Houses. This system is most notable for being the development base of the "Vid Kidz", a pair of programmers (Eugene Jarvis and Larry DeMar) who formerly worked for Williams Electronics on the game, Defender. They left Willams and continued work on other games eventually making a deal with Williams to continue to design games producing the titles: Stargate, Robotron: 2084 and Blaster. Information Link: http://www.backglass.org/duncan/gimix/ TODO: Everything Usage: System boots into GMXBUG-09 To boot Flex, insert the Flex system disk (3.3 or later, must support the DMA disk controller), type U and press enter. To boot OS-9, insert the OS-9 system disk, type O, and press Enter. Note that booting OS-9 doesn't currently work without a timer hack. */ #include "emu.h" #include "cpu/m6809/m6809.h" #include "machine/mm58167.h" #include "machine/6840ptm.h" #include "machine/6821pia.h" #include "machine/6850acia.h" #include "bus/rs232/rs232.h" #include "machine/clock.h" #include "machine/wd_fdc.h" #include "machine/bankdev.h" #include "machine/ram.h" #include "machine/timer.h" #include "formats/flex_dsk.h" #include "softlist.h" #define DMA_DRQ (m_dma_status & 0x80) #define DMA_INTRQ (m_dma_status & 0x40) #define DMA_MOTOR_DELAY (m_dma_status & 0x20) #define DMA_ENABLED (m_dma_status & 0x10) #define DMA_FAULT (m_dma_status & 0x08) #define DMA_DRIVE_SIZE (m_dma_status & 0x04) #define DMA_DIP_SENSE (m_dma_status & 0x01) #define DMA_CONNECT_SEL (m_dma_drive_select & 0x40) #define DMA_DENSITY (m_dma_drive_select & 0x20) #define DMA_WR_PROTECT (m_dma_drive_select & 0x10) #define DMA_SEL_DRV3 (m_dma_drive_select & 0x08) #define DMA_SEL_DRV2 (m_dma_drive_select & 0x04) #define DMA_SEL_DRV1 (m_dma_drive_select & 0x02) #define DMA_SEL_DRV0 (m_dma_drive_select & 0x01) #define DMA_IRQ_ENABLE (m_dma_ctrl & 0x80) #define DMA_SIDE_SEL (m_dma_ctrl & 0x40) #define DMA_DIRECTION (m_dma_ctrl & 0x20) #define DMA_ENABLE (m_dma_ctrl & 0x10) #define DMA_BANK (m_dma_ctrl & 0x0f) #define DMA_START_ADDR (((m_dma_ctrl & 0x0f) << 16) | m_dma_start_addr) class gimix_state : public driver_device { public: gimix_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_fdc(*this, "fdc") , m_floppy0(*this, "fdc:0") , m_floppy1(*this, "fdc:1") , m_ram(*this, RAM_TAG) , m_rom(*this, "roms") , m_acia1(*this, "acia1") , m_acia2(*this, "acia2") , m_acia3(*this, "acia3") , m_acia4(*this, "acia4") , m_bank(*this, "bank%u", 1U) , m_rombank1(*this, "rombank1") , m_rombank2(*this, "rombank2") , m_fixedrombank(*this, "fixedrombank") , m_dma_dip(*this, "dma_s2") {} void gimix(machine_config &config); DECLARE_INPUT_CHANGED_MEMBER(drive_size_cb); private: DECLARE_WRITE8_MEMBER(system_w); DECLARE_WRITE_LINE_MEMBER(irq_w); DECLARE_WRITE_LINE_MEMBER(fdc_irq_w); DECLARE_WRITE_LINE_MEMBER(fdc_drq_w); DECLARE_READ8_MEMBER(dma_r); DECLARE_WRITE8_MEMBER(dma_w); DECLARE_READ8_MEMBER(fdc_r); DECLARE_WRITE8_MEMBER(fdc_w); DECLARE_READ8_MEMBER(pia_pa_r); DECLARE_WRITE8_MEMBER(pia_pa_w); DECLARE_READ8_MEMBER(pia_pb_r); DECLARE_WRITE8_MEMBER(pia_pb_w); TIMER_DEVICE_CALLBACK_MEMBER(test_timer_w); DECLARE_FLOPPY_FORMATS(floppy_formats); void gimix_banked_mem(address_map &map); void gimix_mem(address_map &map); uint8_t m_term_data; uint8_t m_dma_status; uint8_t m_dma_ctrl; uint8_t m_dma_drive_select; uint16_t m_dma_start_addr; uint32_t m_dma_current_addr; uint8_t m_task; uint8_t m_task_banks[16][16]; uint8_t m_selected_drive; bool m_floppy0_ready; bool m_floppy1_ready; uint8_t m_pia1_pa; uint8_t m_pia1_pb; virtual void machine_reset() override; virtual void machine_start() override; virtual void driver_start() override; void refresh_memory(); required_device m_maincpu; required_device m_fdc; required_device m_floppy0; required_device m_floppy1; required_device m_ram; required_memory_region m_rom; required_device m_acia1; required_device m_acia2; required_device m_acia3; required_device m_acia4; required_device_array m_bank; required_memory_bank m_rombank1; required_memory_bank m_rombank2; required_memory_bank m_fixedrombank; required_ioport m_dma_dip; }; void gimix_state::gimix_banked_mem(address_map &map) { map(0x00000, 0x0dfff).bankrw("lower_ram"); map(0x0e000, 0x0e001).rw(m_acia1, FUNC(acia6850_device::read), FUNC(acia6850_device::write)); map(0x0e004, 0x0e005).rw(m_acia2, FUNC(acia6850_device::read), FUNC(acia6850_device::write)); //AM_RANGE(0x0e018, 0x0e01b) AM_READWRITE(fdc_r, fdc_w) // FD1797 FDC (PIO) map(0x0e100, 0x0e1ff).ram(); //AM_RANGE(0x0e200, 0x0e20f) // 9511A / 9512 Arithmetic Processor map(0x0e210, 0x0e21f).rw("timer", FUNC(ptm6840_device::read), FUNC(ptm6840_device::write)); map(0x0e220, 0x0e23f).rw("rtc", FUNC(mm58167_device::read), FUNC(mm58167_device::write)); map(0x0e240, 0x0e3af).ram(); map(0x0e3b0, 0x0e3b3).rw(FUNC(gimix_state::dma_r), FUNC(gimix_state::dma_w)); // DMA controller (custom?) map(0x0e3b4, 0x0e3b7).rw(FUNC(gimix_state::fdc_r), FUNC(gimix_state::fdc_w)); // FD1797 FDC map(0x0e400, 0x0e7ff).ram(); // scratchpad RAM map(0x0e800, 0x0efff).ram(); map(0x0f000, 0x0f7ff).bankr("rombank2"); map(0x0f800, 0x0ffff).bankr("rombank1"); //AM_RANGE(0x10000, 0x1ffff) AM_RAM } void gimix_state::gimix_mem(address_map &map) { for (int bank = 0; bank < 16; bank++) { map(bank << 12, (bank << 12) | 0x0fff).rw(m_bank[bank], FUNC(address_map_bank_device::read8), FUNC(address_map_bank_device::write8)); } map(0xff00, 0xffff).bankr("fixedrombank").w(FUNC(gimix_state::system_w)); } static INPUT_PORTS_START( gimix ) PORT_START("dma_s2") PORT_DIPNAME(0x00000100,0x00000000,"5.25\" / 8\" floppy drive 0") PORT_DIPLOCATION("S2:9") PORT_CHANGED_MEMBER(DEVICE_SELF,gimix_state,drive_size_cb,nullptr) PORT_DIPSETTING(0x00000000,"5.25\"") PORT_DIPSETTING(0x00000100,"8\"") INPUT_PORTS_END void gimix_state::refresh_memory() { for (int bank = 0; bank < 16; bank++) { m_bank[bank]->set_bank(m_task_banks[m_task][bank]); } } WRITE8_MEMBER( gimix_state::system_w ) { if(offset == 0x7f) // task register { if(data & 0x20) // FPLA software latch { m_rombank1->set_entry(2); m_rombank2->set_entry(3); m_fixedrombank->set_entry(2); logerror("SYS: FPLA software latch set\n"); } else { m_rombank1->set_entry(0); m_rombank2->set_entry(1); m_fixedrombank->set_entry(0); logerror("SYS: FPLA software latch reset\n"); } m_task = data & 0x0f; refresh_memory(); logerror("SYS: Task set to %02x\n",data & 0x0f); } if(offset >= 0xf0) // Dynamic Address Translation RAM (write only) { m_bank[offset-0xf0]->set_bank(data & 0x0f); m_task_banks[m_task][offset-0xf0] = data & 0x0f; logerror("SYS: Bank %i set to physical bank %02x\n",offset-0xf0,data); } } READ8_MEMBER(gimix_state::dma_r) { switch(offset) { case 0: if(m_dma_dip->read() & 0x00000100) m_dma_status |= 0x01; // 8" else m_dma_status &= ~0x01; // 5.25" return m_dma_status; case 1: return m_dma_ctrl; case 2: return (m_dma_start_addr & 0xff00) >> 8; case 3: return (m_dma_start_addr & 0x00ff); default: logerror("DMA: Unknown or invalid DMA register %02x read\n",offset); } return 0xff; } WRITE8_MEMBER(gimix_state::dma_w) { switch(offset) { case 0: logerror("DMA: Drive select %02x\n",data); m_dma_drive_select = data; m_fdc->dden_w(DMA_DENSITY ? 1 : 0); if(data & 0x40) // 8" / 5.25" connector select m_dma_status |= 0x04; else m_dma_status &= ~0x04; if(data & 0x01) { m_fdc->set_floppy(m_floppy0->get_device()); m_selected_drive = 1; m_floppy1->get_device()->mon_w(1); // switch off the motor of other drives... m_floppy1_ready = false; logerror("FDC: Floppy drive 1 motor off\n"); } if(data & 0x02) { m_fdc->set_floppy(m_floppy1->get_device()); m_selected_drive = 2; m_floppy0->get_device()->mon_w(1); // switch off the motor of other drives... m_floppy0_ready = false; logerror("FDC: Floppy drive 0 motor off\n"); } break; case 1: logerror("DMA: DMA control %02x\n",data); m_dma_ctrl = data; if(data & 0x10) m_dma_status |= 0x12; else m_dma_status &= ~0x12; if(data & 0x40) { if(m_selected_drive == 1) m_floppy0->get_device()->ss_w(1); if(m_selected_drive == 2) m_floppy1->get_device()->ss_w(1); } else { if(m_selected_drive == 1) m_floppy0->get_device()->ss_w(0); if(m_selected_drive == 2) m_floppy1->get_device()->ss_w(0); } break; case 2: logerror("DMA: DMA start address MSB %02x\n",data); m_dma_start_addr = (m_dma_start_addr & 0x00ff) | (data << 8); m_dma_current_addr = DMA_START_ADDR; break; case 3: logerror("DMA: DMA start address LSB %02x\n",data); m_dma_start_addr = (m_dma_start_addr & 0xff00) | data; m_dma_current_addr = DMA_START_ADDR; break; default: logerror("DMA: Unknown or invalid DMA register %02x write %02x\n",offset,data); } } READ8_MEMBER(gimix_state::fdc_r) { // motors are switched on on FDC access if(m_selected_drive == 1 && m_floppy0_ready == false) { m_floppy0->get_device()->mon_w(0); m_floppy0_ready = true; logerror("FDC: Floppy drive 0 motor on\n"); } if(m_selected_drive == 2 && m_floppy1_ready == false) { m_floppy1->get_device()->mon_w(0); m_floppy1_ready = true; logerror("FDC: Floppy drive 1 motor on\n"); } return m_fdc->read(offset); } WRITE8_MEMBER(gimix_state::fdc_w) { // motors are switched on on FDC access if(m_selected_drive == 1) m_floppy0->get_device()->mon_w(0); if(m_selected_drive == 2) m_floppy1->get_device()->mon_w(0); m_fdc->write(offset,data); } READ8_MEMBER(gimix_state::pia_pa_r) { return m_pia1_pa; } WRITE8_MEMBER(gimix_state::pia_pa_w) { m_pia1_pa = data; logerror("PIA: Port A write %02x\n",data); } READ8_MEMBER(gimix_state::pia_pb_r) { return m_pia1_pb; } WRITE8_MEMBER(gimix_state::pia_pb_w) { m_pia1_pb = data; logerror("PIA: Port B write %02x\n",data); } WRITE_LINE_MEMBER(gimix_state::irq_w) { m_maincpu->set_input_line(M6809_IRQ_LINE,state ? ASSERT_LINE : CLEAR_LINE); } WRITE_LINE_MEMBER(gimix_state::fdc_irq_w) { if(state) m_dma_status |= 0x40; else m_dma_status &= ~0x40; } WRITE_LINE_MEMBER(gimix_state::fdc_drq_w) { if(state && DMA_ENABLED) { m_dma_status |= 0x80; // do a DMA transfer if(DMA_DIRECTION) { // write to disk m_fdc->data_w(m_ram->read(m_dma_current_addr)); // logerror("DMA: read from RAM %05x\n",m_dma_current_addr); } else { // read from disk m_ram->write(m_dma_current_addr,m_fdc->data_r()); // logerror("DMA: write to RAM %05x\n",m_dma_current_addr); } m_dma_current_addr++; } else m_dma_status &= ~0x80; } INPUT_CHANGED_MEMBER(gimix_state::drive_size_cb) { // set FDC clock based on DIP Switch S2-9 (5.25"/8" drive select) if(m_dma_dip->read() & 0x00000100) m_fdc->set_unscaled_clock(8_MHz_XTAL / 4); // 8 inch (2MHz) else m_fdc->set_unscaled_clock(8_MHz_XTAL / 8); // 5.25 inch (1MHz) } void gimix_state::machine_reset() { m_term_data = 0; m_rombank1->set_entry(0); // RAM banks are undefined on startup m_rombank2->set_entry(1); m_fixedrombank->set_entry(0); m_dma_status = 0x00; m_dma_ctrl = 0x00; m_task = 0x00; m_selected_drive = 0; m_floppy0_ready = false; m_floppy1_ready = false; membank("lower_ram")->set_base(m_ram->pointer()); if(m_ram->size() > 65536) membank("upper_ram")->set_base(m_ram->pointer()+0x10000); // initialise FDC clock based on DIP Switch S2-9 (5.25"/8" drive select) if(m_dma_dip->read() & 0x00000100) m_fdc->set_unscaled_clock(8_MHz_XTAL / 4); // 8 inch (2MHz) else m_fdc->set_unscaled_clock(8_MHz_XTAL / 8); // 5.25 inch (1MHz) } void gimix_state::machine_start() { uint8_t* ROM = m_rom->base(); m_rombank1->configure_entries(0,4,ROM,0x800); m_rombank2->configure_entries(0,4,ROM,0x800); m_fixedrombank->configure_entries(0,4,ROM+0x700,0x800); m_rombank1->set_entry(0); // RAM banks are undefined on startup m_rombank2->set_entry(1); m_fixedrombank->set_entry(0); // install any extra RAM if(m_ram->size() > 65536) { for (int bank = 0; bank < 16; bank++) { m_bank[bank]->space(AS_PROGRAM).install_readwrite_bank(0x10000,m_ram->size()-1,"upper_ram"); } } m_floppy0->get_device()->set_rpm(300); m_floppy1->get_device()->set_rpm(300); } void gimix_state::driver_start() { } TIMER_DEVICE_CALLBACK_MEMBER(gimix_state::test_timer_w) { static bool prev; if(!prev) { m_maincpu->set_input_line(M6809_IRQ_LINE,ASSERT_LINE); prev = true; } else { m_maincpu->set_input_line(M6809_IRQ_LINE,CLEAR_LINE); prev = false; } } FLOPPY_FORMATS_MEMBER( gimix_state::floppy_formats ) FLOPPY_FLEX_FORMAT FLOPPY_FORMATS_END static void gimix_floppies(device_slot_interface &device) { device.option_add("525hd", FLOPPY_525_HD); device.option_add("8dd", FLOPPY_8_DSDD); } MACHINE_CONFIG_START(gimix_state::gimix) // basic machine hardware MCFG_DEVICE_ADD("maincpu", MC6809, 8_MHz_XTAL) MCFG_DEVICE_PROGRAM_MAP(gimix_mem) /* rtc */ MCFG_DEVICE_ADD("rtc", MM58167, 32.768_kHz_XTAL) MCFG_MM58167_IRQ_CALLBACK(WRITELINE(*this, gimix_state,irq_w)) /* timer */ ptm6840_device &ptm(PTM6840(config, "timer", 2'000'000)); // clock is a guess ptm.irq_callback().set(FUNC(gimix_state::irq_w)); // PCB pictures show both the RTC and timer set to generate IRQs (are jumper configurable) /* floppy disks */ FD1797(config, m_fdc, 8_MHz_XTAL / 4); m_fdc->intrq_wr_callback().set(FUNC(gimix_state::fdc_irq_w)); m_fdc->drq_wr_callback().set(FUNC(gimix_state::fdc_drq_w)); m_fdc->set_force_ready(true); MCFG_FLOPPY_DRIVE_ADD("fdc:0", gimix_floppies, "525hd", gimix_state::floppy_formats) MCFG_FLOPPY_DRIVE_ADD("fdc:1", gimix_floppies, "525hd", gimix_state::floppy_formats) /* parallel ports */ pia6821_device &pia1(PIA6821(config, "pia1", 2'000'000)); pia1.writepa_handler().set(FUNC(gimix_state::pia_pa_w)); pia1.writepb_handler().set(FUNC(gimix_state::pia_pb_w)); pia1.readpa_handler().set(FUNC(gimix_state::pia_pa_r)); pia1.readpb_handler().set(FUNC(gimix_state::pia_pb_r)); PIA6821(config, "pia2", 2'000'000); /* serial ports */ ACIA6850(config, m_acia1, 2'000'000); m_acia1->txd_handler().set("serial1", FUNC(rs232_port_device::write_txd)); m_acia1->rts_handler().set("serial1", FUNC(rs232_port_device::write_rts)); ACIA6850(config, m_acia2, 2'000'000); m_acia2->txd_handler().set("serial2", FUNC(rs232_port_device::write_txd)); m_acia2->rts_handler().set("serial2", FUNC(rs232_port_device::write_rts)); ACIA6850(config, m_acia3, 2'000'000); m_acia3->txd_handler().set("serial3", FUNC(rs232_port_device::write_txd)); m_acia3->rts_handler().set("serial3", FUNC(rs232_port_device::write_rts)); ACIA6850(config, m_acia4, 2'000'000); m_acia4->txd_handler().set("serial4", FUNC(rs232_port_device::write_txd)); m_acia4->rts_handler().set("serial4", FUNC(rs232_port_device::write_rts)); rs232_port_device &serial1(RS232_PORT(config, "serial1", default_rs232_devices, nullptr)); serial1.rxd_handler().set(m_acia1, FUNC(acia6850_device::write_rxd)); serial1.cts_handler().set(m_acia1, FUNC(acia6850_device::write_cts)); rs232_port_device &serial2(RS232_PORT(config, "serial2", default_rs232_devices, "terminal")); serial2.rxd_handler().set(m_acia2, FUNC(acia6850_device::write_rxd)); serial2.cts_handler().set(m_acia2, FUNC(acia6850_device::write_cts)); rs232_port_device &serial3(RS232_PORT(config, "serial3", default_rs232_devices, nullptr)); serial3.rxd_handler().set(m_acia3, FUNC(acia6850_device::write_rxd)); serial3.cts_handler().set(m_acia3, FUNC(acia6850_device::write_cts)); rs232_port_device &serial4(RS232_PORT(config, "serial4", default_rs232_devices, nullptr)); serial4.rxd_handler().set(m_acia4, FUNC(acia6850_device::write_rxd)); serial4.cts_handler().set(m_acia4, FUNC(acia6850_device::write_cts)); clock_device &acia_clock(CLOCK(config, "acia_clock", 153600)); acia_clock.signal_handler().set(m_acia1, FUNC(acia6850_device::write_txc)); acia_clock.signal_handler().append(m_acia1, FUNC(acia6850_device::write_rxc)); acia_clock.signal_handler().append(m_acia2, FUNC(acia6850_device::write_txc)); acia_clock.signal_handler().append(m_acia2, FUNC(acia6850_device::write_rxc)); /* banking */ for (int bank = 0; bank < 16; bank++) { ADDRESS_MAP_BANK(config, m_bank[bank]).set_map(&gimix_state::gimix_banked_mem).set_options(ENDIANNESS_LITTLE, 8, 32, 0x1000); } /* internal ram */ RAM(config, RAM_TAG).set_default_size("128K").set_extra_options("56K,256K,512K"); MCFG_SOFTWARE_LIST_ADD("flop_list","gimix") // uncomment this timer to use a hack that generates a regular IRQ, this will get OS-9 to boot // for some unknown reason, OS-9 does not touch the 6840, and only clears/disables IRQs on the RTC //MCFG_TIMER_DRIVER_ADD_PERIODIC("test_timer",gimix_state,test_timer_w,attotime::from_msec(100)) MACHINE_CONFIG_END ROM_START( gimix ) ROM_REGION( 0x10000, "roms", 0) /* CPU board U4: gimixf8.bin - checksum 68DB - 2716 - GMXBUG09 V2.1 | (c)1981 GIMIX | $F800 I2716 */ ROM_LOAD( "gimixf8.u4", 0x000000, 0x000800, CRC(7d60f838) SHA1(eb7546e8bbf50d33e181f3e86c3e4c5c9032cab2) ) /* CPU board U5: gimixv14.bin - checksum 97E2 - 2716 - GIMIX 6809 | AUTOBOOT | V1.4 I2716 */ ROM_LOAD( "gimixv14.u5", 0x000800, 0x000800, CRC(f795b8b9) SHA1(eda2de51cc298d94b36605437d900ce971b3b276) ) /* CPU board U6: os9l1v11.bin - checksum 2C84 - 2716 - OS-9tmL1 V1 | GIMIX P1 " (c)1982 MSC CPU board U7: os9l1v12.bin - checksum 7694 - 2716 - OS-9tmL1 V1 | GIMIX P2-68 | (c)1982 MSC */ ROM_LOAD( "os9l1v11.u6", 0x001000, 0x000800, CRC(0d6527a0) SHA1(1435a22581c6e9e0ae338071a72eed646f429530) ) ROM_LOAD( "os9l1v12.u7", 0x001800, 0x000800, CRC(b3c65feb) SHA1(19d1ea1e84473b25c95cbb8449e6b9828567e998) ) /* Hard drive controller board 2 (XEBEC board) 11H: gimixhd.bin - checksum 2436 - 2732 - 104521D */ ROM_REGION( 0x10000, "xebec", 0) ROM_LOAD( "gimixhd.h11", 0x000000, 0x001000, CRC(35c12201) SHA1(51ac9052f9757d79c7f5bd3aa5d8421e98cfcc37) ) ROM_END COMP( 1980, gimix, 0, 0, gimix, gimix, gimix_state, empty_init, "Gimix", "Gimix 6809 System", MACHINE_IS_SKELETON )