// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Commodore 8280 Dual 8" Disk Drive emulation **********************************************************************/ #include "emu.h" #include "c8280.h" //************************************************************************** // MACROS / CONSTANTS //************************************************************************** #define M6502_DOS_TAG "5c" #define M6502_FDC_TAG "9e" #define M6532_0_TAG "9f" #define M6532_1_TAG "9g" #define WD1797_TAG "5e" enum { LED_POWER = 0, LED_ACT0, LED_ACT1, LED_ERR }; //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(C8280, c8280_device, "c8280", "Commodore 8280") //------------------------------------------------- // ROM( c8280 ) //------------------------------------------------- ROM_START( c8280 ) ROM_REGION( 0x4000, M6502_DOS_TAG, 0 ) ROM_DEFAULT_BIOS("r2") ROM_SYSTEM_BIOS( 0, "r1", "Revision 1" ) ROMX_LOAD( "300542-001.10c", 0x0000, 0x2000, CRC(3c6eee1e) SHA1(0726f6ab4de4fc9c18707fe87780ffd9f5ed72ab), ROM_BIOS(1) ) ROMX_LOAD( "300543-001.10d", 0x2000, 0x2000, CRC(f58e665e) SHA1(9e58b47c686c91efc6ef1a27f72dbb5e26c485ec), ROM_BIOS(1) ) ROM_SYSTEM_BIOS( 1, "r2", "Revision 2" ) ROMX_LOAD( "300542-reva.10c", 0x0000, 0x2000, CRC(6f32ccfb) SHA1(6926c049f1635e6769ec69891de8c92941ff880e), ROM_BIOS(2) ) ROMX_LOAD( "300543-reva.10d", 0x2000, 0x2000, CRC(1af93f2c) SHA1(ad197b1d5dfa273487b33f473403ebd20dd15b2b), ROM_BIOS(2) ) ROM_REGION( 0x800, M6502_FDC_TAG, 0 ) ROMX_LOAD( "300541-001.3c", 0x000, 0x800, BAD_DUMP CRC(cb07b2db) SHA1(a1f9c5a7bd3798f5a97dc0b465c3bf5e3513e148), ROM_BIOS(1) ) ROMX_LOAD( "300541-revb.3c", 0x000, 0x800, CRC(403e632c) SHA1(a0994c80025240d2b49ffd209dbfe8a4de3975b0), ROM_BIOS(2) ) ROM_END //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const tiny_rom_entry *c8280_device::device_rom_region() const { return ROM_NAME( c8280 ); } //------------------------------------------------- // ADDRESS_MAP( c8280_main_mem ) //------------------------------------------------- void c8280_device::c8280_main_mem(address_map &map) { map(0x0000, 0x007f).mirror(0x100).m(M6532_0_TAG, FUNC(mos6532_new_device::ram_map)); map(0x0080, 0x00ff).mirror(0x100).m(M6532_1_TAG, FUNC(mos6532_new_device::ram_map)); map(0x0200, 0x021f).mirror(0xd60).m(M6532_0_TAG, FUNC(mos6532_new_device::io_map)); map(0x0280, 0x029f).mirror(0xd60).m(M6532_1_TAG, FUNC(mos6532_new_device::io_map)); map(0x1000, 0x13ff).mirror(0xc00).ram().share("share1"); map(0x2000, 0x23ff).mirror(0xc00).ram().share("share2"); map(0x3000, 0x33ff).mirror(0xc00).ram().share("share3"); map(0x4000, 0x43ff).mirror(0xc00).ram().share("share4"); map(0xc000, 0xffff).rom().region(M6502_DOS_TAG, 0); } //------------------------------------------------- // ADDRESS_MAP( c8280_fdc_mem ) //------------------------------------------------- void c8280_device::c8280_fdc_mem(address_map &map) { map.global_mask(0x1fff); map(0x0000, 0x007f).mirror(0x300).ram(); map(0x0080, 0x0083).mirror(0x37c).rw(WD1797_TAG, FUNC(fd1797_device::read), FUNC(fd1797_device::write)); map(0x0400, 0x07ff).ram().share("share1"); map(0x0800, 0x0bff).ram().share("share2"); map(0x0c00, 0x0fff).ram().share("share3"); map(0x1000, 0x13ff).ram().share("share4"); map(0x1400, 0x1400).mirror(0x3ff).rw(this, FUNC(c8280_device::fk5_r), FUNC(c8280_device::fk5_w)); map(0x1800, 0x1fff).rom().region(M6502_FDC_TAG, 0); } //------------------------------------------------- // riot6532 0 //------------------------------------------------- READ8_MEMBER( c8280_device::dio_r ) { /* bit description PA0 DI0 PA1 DI1 PA2 DI2 PA3 DI3 PA4 DI4 PA5 DI5 PA6 DI6 PA7 DI7 */ return m_bus->dio_r(); } WRITE8_MEMBER( c8280_device::dio_w ) { /* bit description PB0 DO0 PB1 DO1 PB2 DO2 PB3 DO3 PB4 DO4 PB5 DO5 PB6 DO6 PB7 DO7 */ m_bus->dio_w(this, data); } //------------------------------------------------- // riot6532 1 //------------------------------------------------- READ8_MEMBER( c8280_device::riot1_pa_r ) { /* bit description PA0 PA1 PA2 PA3 PA4 PA5 EOII PA6 DAVI PA7 _ATN */ uint8_t data = 0; // end or identify in data |= m_bus->eoi_r() << 5; // data valid in data |= m_bus->dav_r() << 6; // attention data |= !m_bus->atn_r() << 7; return data; } WRITE8_MEMBER( c8280_device::riot1_pa_w ) { /* bit description PA0 ATNA PA1 DACO PA2 RFDO PA3 EOIO PA4 DAVO PA5 PA6 PA7 */ // attention acknowledge m_atna = BIT(data, 0); // data accepted out m_daco = BIT(data, 1); // not ready for data out m_rfdo = BIT(data, 2); // end or identify out m_bus->eoi_w(this, BIT(data, 3)); // data valid out m_bus->dav_w(this, BIT(data, 4)); update_ieee_signals(); } READ8_MEMBER( c8280_device::riot1_pb_r ) { /* bit description PB0 DEVICE NUMBER SELECTION PB1 DEVICE NUMBER SELECTION PB2 DEVICE NUMBER SELECTION PB3 PB4 PB5 PB6 DACI PB7 RFDI */ uint8_t data = 0; // device number selection data |= m_slot->get_address() - 8; // data accepted in data |= m_bus->ndac_r() << 6; // ready for data in data |= m_bus->nrfd_r() << 7; return data; } WRITE8_MEMBER( c8280_device::riot1_pb_w ) { /* bit description PB0 PB1 PB2 PB3 ACT LED 1 PB4 ACT LED 0 PB5 ERR LED PB6 PB7 */ // activity led 1 m_leds[LED_ACT1] = BIT(data, 3); // activity led 0 m_leds[LED_ACT0] = BIT(data, 4); // error led m_leds[LED_ERR] = BIT(data, 5); } static void c8280_floppies(device_slot_interface &device) { device.option_add("8dsdd", FLOPPY_8_DSDD); } FLOPPY_FORMATS_MEMBER( c8280_device::floppy_formats ) FLOPPY_C8280_FORMAT FLOPPY_FORMATS_END //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- MACHINE_CONFIG_START(c8280_device::device_add_mconfig) MCFG_DEVICE_ADD(M6502_DOS_TAG, M6502, XTAL(12'000'000)/8) MCFG_DEVICE_PROGRAM_MAP(c8280_main_mem) MCFG_DEVICE_ADD(M6532_0_TAG, MOS6532_NEW, XTAL(12'000'000)/8) MCFG_MOS6530n_IN_PA_CB(READ8(*this, c8280_device, dio_r)) MCFG_MOS6530n_OUT_PB_CB(WRITE8(*this, c8280_device, dio_w)) MCFG_DEVICE_ADD(M6532_1_TAG, MOS6532_NEW, XTAL(12'000'000)/8) MCFG_MOS6530n_IN_PA_CB(READ8(*this, c8280_device, riot1_pa_r)) MCFG_MOS6530n_OUT_PA_CB(WRITE8(*this, c8280_device, riot1_pa_w)) MCFG_MOS6530n_IN_PB_CB(READ8(*this, c8280_device, riot1_pb_r)) MCFG_MOS6530n_OUT_PB_CB(WRITE8(*this, c8280_device, riot1_pb_w)) MCFG_MOS6530n_IRQ_CB(INPUTLINE(M6502_DOS_TAG, INPUT_LINE_IRQ0)) MCFG_DEVICE_ADD(M6502_FDC_TAG, M6502, XTAL(12'000'000)/8) MCFG_DEVICE_PROGRAM_MAP(c8280_fdc_mem) MCFG_FD1797_ADD(WD1797_TAG, XTAL(12'000'000)/6) MCFG_WD_FDC_INTRQ_CALLBACK(INPUTLINE(M6502_FDC_TAG, M6502_IRQ_LINE)) MCFG_WD_FDC_DRQ_CALLBACK(INPUTLINE(M6502_FDC_TAG, M6502_SET_OVERFLOW)) MCFG_FLOPPY_DRIVE_ADD(WD1797_TAG ":0", c8280_floppies, "8dsdd", c8280_device::floppy_formats) MCFG_FLOPPY_DRIVE_ADD(WD1797_TAG ":1", c8280_floppies, "8dsdd", c8280_device::floppy_formats) MACHINE_CONFIG_END //------------------------------------------------- // INPUT_PORTS( c8280 ) //------------------------------------------------- static INPUT_PORTS_START( c8280 ) PORT_START("ADDRESS") PORT_DIPNAME( 0x07, 0x00, "Device Address" ) PORT_DIPSETTING( 0x00, "8" ) PORT_DIPSETTING( 0x01, "9" ) PORT_DIPSETTING( 0x02, "10" ) PORT_DIPSETTING( 0x03, "11" ) PORT_DIPSETTING( 0x04, "12" ) PORT_DIPSETTING( 0x05, "13" ) PORT_DIPSETTING( 0x06, "14" ) PORT_DIPSETTING( 0x07, "15" ) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor c8280_device::device_input_ports() const { return INPUT_PORTS_NAME( c8280 ); } //************************************************************************** // INLINE HELPERS //************************************************************************** //------------------------------------------------- // update_ieee_signals - //------------------------------------------------- inline void c8280_device::update_ieee_signals() { int atn = m_bus->atn_r(); int nrfd = !(!(!(atn && m_atna) && m_rfdo) || !(atn || m_atna)); int ndac = !(m_daco || !(atn || m_atna)); m_bus->nrfd_w(this, nrfd); m_bus->ndac_w(this, ndac); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c8280_device - constructor //------------------------------------------------- c8280_device::c8280_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, C8280, tag, owner, clock), device_ieee488_interface(mconfig, *this), m_maincpu(*this, M6502_DOS_TAG), m_fdccpu(*this, M6502_FDC_TAG), m_riot0(*this, M6532_0_TAG), m_riot1(*this, M6532_1_TAG), m_fdc(*this, WD1797_TAG), m_floppy0(*this, WD1797_TAG ":0"), m_floppy1(*this, WD1797_TAG ":1"), m_address(*this, "ADDRESS"), m_floppy(nullptr), m_leds(*this, "led%u", 0U), m_rfdo(1), m_daco(1), m_atna(1), m_ifc(0), m_fk5(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c8280_device::device_start() { m_leds.resolve(); // state saving save_item(NAME(m_rfdo)); save_item(NAME(m_daco)); save_item(NAME(m_atna)); save_item(NAME(m_ifc)); save_item(NAME(m_fk5)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c8280_device::device_reset() { m_maincpu->reset(); // toggle M6502 SO m_maincpu->set_input_line(M6502_SET_OVERFLOW, ASSERT_LINE); m_maincpu->set_input_line(M6502_SET_OVERFLOW, CLEAR_LINE); m_fdccpu->reset(); m_riot0->reset(); m_riot1->reset(); m_fdc->reset(); m_riot1->pa7_w(1); m_fk5 = 0; m_floppy = nullptr; m_fdc->set_floppy(m_floppy); m_fdc->dden_w(0); } //------------------------------------------------- // ieee488_atn - //------------------------------------------------- void c8280_device::ieee488_atn(int state) { update_ieee_signals(); m_riot1->pa7_w(state); } //------------------------------------------------- // ieee488_ifc - //------------------------------------------------- void c8280_device::ieee488_ifc(int state) { if (!m_ifc && state) { device_reset(); } m_ifc = state; } READ8_MEMBER( c8280_device::fk5_r ) { /* bit description 0 1 2 3 DCHG 4 TSID 5 6 0 7 0 */ uint8_t data = m_fk5; data |= (m_floppy ? m_floppy->dskchg_r() : 1) << 3; data |= (m_floppy ? m_floppy->twosid_r() : 1) << 4; return data; } WRITE8_MEMBER( c8280_device::fk5_w ) { /* bit description 0 DS1 1 DS2 2 _DDEN 3 4 5 MOTOR ENABLE 6 7 */ m_fk5 = data & 0x27; // drive select m_floppy = nullptr; if (BIT(data, 0)) m_floppy = m_floppy0->get_device(); if (BIT(data, 1)) m_floppy = m_floppy1->get_device(); m_fdc->set_floppy(m_floppy); if (m_floppy) m_floppy->mon_w(!BIT(data, 5)); // density select m_fdc->dden_w(BIT(data, 2)); }