diff options
Diffstat (limited to 'src/devices/bus/ieee488/c8280.cpp')
-rw-r--r-- | src/devices/bus/ieee488/c8280.cpp | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/src/devices/bus/ieee488/c8280.cpp b/src/devices/bus/ieee488/c8280.cpp new file mode 100644 index 00000000000..1dd1c679c5d --- /dev/null +++ b/src/devices/bus/ieee488/c8280.cpp @@ -0,0 +1,527 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Commodore 8280 Dual 8" Disk Drive emulation + +**********************************************************************/ + +#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 +//************************************************************************** + +const device_type C8280 = &device_creator<c8280_t>; + + +//------------------------------------------------- +// 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 rom_entry *c8280_t::device_rom_region() const +{ + return ROM_NAME( c8280 ); +} + + +//------------------------------------------------- +// ADDRESS_MAP( c8280_main_mem ) +//------------------------------------------------- + +static ADDRESS_MAP_START( c8280_main_mem, AS_PROGRAM, 8, c8280_t ) + AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x100) AM_DEVICE(M6532_0_TAG, mos6532_t, ram_map) + AM_RANGE(0x0080, 0x00ff) AM_MIRROR(0x100) AM_DEVICE(M6532_1_TAG, mos6532_t, ram_map) + AM_RANGE(0x0200, 0x021f) AM_MIRROR(0xd60) AM_DEVICE(M6532_0_TAG, mos6532_t, io_map) + AM_RANGE(0x0280, 0x029f) AM_MIRROR(0xd60) AM_DEVICE(M6532_1_TAG, mos6532_t, io_map) + AM_RANGE(0x1000, 0x13ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share1") + AM_RANGE(0x2000, 0x23ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share2") + AM_RANGE(0x3000, 0x33ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share3") + AM_RANGE(0x4000, 0x43ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share4") + AM_RANGE(0xc000, 0xffff) AM_ROM AM_REGION(M6502_DOS_TAG, 0) +ADDRESS_MAP_END + + +//------------------------------------------------- +// ADDRESS_MAP( c8280_fdc_mem ) +//------------------------------------------------- + +static ADDRESS_MAP_START( c8280_fdc_mem, AS_PROGRAM, 8, c8280_t ) + ADDRESS_MAP_GLOBAL_MASK(0x1fff) + AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x300) AM_RAM + AM_RANGE(0x0080, 0x0083) AM_MIRROR(0x37c) AM_DEVREADWRITE(WD1797_TAG, fd1797_t, read, write) + AM_RANGE(0x0400, 0x07ff) AM_RAM AM_SHARE("share1") + AM_RANGE(0x0800, 0x0bff) AM_RAM AM_SHARE("share2") + AM_RANGE(0x0c00, 0x0fff) AM_RAM AM_SHARE("share3") + AM_RANGE(0x1000, 0x13ff) AM_RAM AM_SHARE("share4") + AM_RANGE(0x1400, 0x1400) AM_MIRROR(0x3ff) AM_READWRITE(fk5_r, fk5_w) + AM_RANGE(0x1800, 0x1fff) AM_ROM AM_REGION(M6502_FDC_TAG, 0) +ADDRESS_MAP_END + + +//------------------------------------------------- +// riot6532 0 +//------------------------------------------------- + +READ8_MEMBER( c8280_t::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_t::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_t::riot1_pa_r ) +{ + /* + + bit description + + PA0 + PA1 + PA2 + PA3 + PA4 + PA5 EOII + PA6 DAVI + PA7 _ATN + + */ + + UINT8 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_t::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_t::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 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_t::riot1_pb_w ) +{ + /* + + bit description + + PB0 + PB1 + PB2 + PB3 ACT LED 1 + PB4 ACT LED 0 + PB5 ERR LED + PB6 + PB7 + + */ + + // activity led 1 + output_set_led_value(LED_ACT1, BIT(data, 3)); + + // activity led 0 + output_set_led_value(LED_ACT0, BIT(data, 4)); + + // error led + output_set_led_value(LED_ERR, BIT(data, 5)); +} + +static SLOT_INTERFACE_START( c8280_floppies ) + SLOT_INTERFACE( "8dsdd", FLOPPY_8_DSDD ) +SLOT_INTERFACE_END + +FLOPPY_FORMATS_MEMBER( c8280_t::floppy_formats ) + FLOPPY_C8280_FORMAT +FLOPPY_FORMATS_END + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c8280 ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c8280 ) + MCFG_CPU_ADD(M6502_DOS_TAG, M6502, XTAL_12MHz/8) + MCFG_CPU_PROGRAM_MAP(c8280_main_mem) + + MCFG_DEVICE_ADD(M6532_0_TAG, MOS6532n, XTAL_12MHz/8) + MCFG_MOS6530n_IN_PA_CB(READ8(c8280_t, dio_r)) + MCFG_MOS6530n_OUT_PB_CB(WRITE8(c8280_t, dio_w)) + + MCFG_DEVICE_ADD(M6532_1_TAG, MOS6532n, XTAL_12MHz/8) + MCFG_MOS6530n_IN_PA_CB(READ8(c8280_t, riot1_pa_r)) + MCFG_MOS6530n_OUT_PA_CB(WRITE8(c8280_t, riot1_pa_w)) + MCFG_MOS6530n_IN_PB_CB(READ8(c8280_t, riot1_pb_r)) + MCFG_MOS6530n_OUT_PB_CB(WRITE8(c8280_t, riot1_pb_w)) + MCFG_MOS6530n_IRQ_CB(INPUTLINE(M6502_DOS_TAG, INPUT_LINE_IRQ0)) + + MCFG_CPU_ADD(M6502_FDC_TAG, M6502, XTAL_12MHz/8) + MCFG_CPU_PROGRAM_MAP(c8280_fdc_mem) + + MCFG_FD1797_ADD(WD1797_TAG, XTAL_12MHz/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_t::floppy_formats) + MCFG_FLOPPY_DRIVE_ADD(WD1797_TAG ":1", c8280_floppies, "8dsdd", c8280_t::floppy_formats) +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c8280_t::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c8280 ); +} + + +//------------------------------------------------- +// 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_t::device_input_ports() const +{ + return INPUT_PORTS_NAME( c8280 ); +} + + + +//************************************************************************** +// INLINE HELPERS +//************************************************************************** + +//------------------------------------------------- +// update_ieee_signals - +//------------------------------------------------- + +inline void c8280_t::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_t - constructor +//------------------------------------------------- + +c8280_t::c8280_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C8280, "C8280", tag, owner, clock, "c8280", __FILE__), + 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_rfdo(1), + m_daco(1), + m_atna(1) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c8280_t::device_start() +{ + // 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_t::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 = NULL; + m_fdc->set_floppy(m_floppy); + m_fdc->dden_w(0); +} + + +//------------------------------------------------- +// ieee488_atn - +//------------------------------------------------- + +void c8280_t::ieee488_atn(int state) +{ + update_ieee_signals(); + + m_riot1->pa7_w(state); +} + + +//------------------------------------------------- +// ieee488_ifc - +//------------------------------------------------- + +void c8280_t::ieee488_ifc(int state) +{ + if (!m_ifc && state) + { + device_reset(); + } + + m_ifc = state; +} + +READ8_MEMBER( c8280_t::fk5_r ) +{ + /* + + bit description + + 0 + 1 + 2 + 3 DCHG + 4 TSID + 5 + 6 0 + 7 0 + + */ + + UINT8 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_t::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 = NULL; + + 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)); +} |