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author | 2019-03-25 22:44:58 +0100 | |
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committer | 2019-03-25 22:44:58 +0100 | |
commit | c24473ddff715ecec2e258a6eb38960cf8c8e98e (patch) | |
tree | 8ea44b6396a6129913c0aac13859b5de9965e972 /src/devices/bus/spectrum/opus.cpp | |
parent | 009cba4fb8102102168ef32870892438327f3705 (diff) | |
parent | 598cd5227223c3b04ca31f0dbc1981256d9ea3ff (diff) |
conflict resolution (nw)
Diffstat (limited to 'src/devices/bus/spectrum/opus.cpp')
-rw-r--r-- | src/devices/bus/spectrum/opus.cpp | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/src/devices/bus/spectrum/opus.cpp b/src/devices/bus/spectrum/opus.cpp new file mode 100644 index 00000000000..be73ef01e92 --- /dev/null +++ b/src/devices/bus/spectrum/opus.cpp @@ -0,0 +1,289 @@ +// license:BSD-3-Clause +// copyright-holders:Nigel Barnes +/********************************************************************** + + Opus Discovery disc system + +**********************************************************************/ + + +#include "emu.h" +#include "opus.h" + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +DEFINE_DEVICE_TYPE(SPECTRUM_OPUS, spectrum_opus_device, "spectrum_opus", "Opus Discovery") + + +//------------------------------------------------- +// INPUT_PORTS( opus ) +//------------------------------------------------- + +static INPUT_PORTS_START( opus ) + PORT_START("JOY") + PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT) PORT_8WAY + PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT) PORT_8WAY + PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN) PORT_8WAY + PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP) PORT_8WAY + PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1) +INPUT_PORTS_END + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor spectrum_opus_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( opus ); +} + +//------------------------------------------------- +// MACHINE_DRIVER( opus ) +//------------------------------------------------- + +FLOPPY_FORMATS_MEMBER( spectrum_opus_device::floppy_formats ) + FLOPPY_OPD_FORMAT +FLOPPY_FORMATS_END + +static void spectrum_floppies(device_slot_interface &device) +{ + device.option_add("35ssdd", FLOPPY_35_SSDD); + device.option_add("35dd", FLOPPY_35_DD); +} + +ROM_START(opus) + ROM_REGION(0x2000, "rom", 0) + ROM_DEFAULT_BIOS("opus22") + ROM_SYSTEM_BIOS(0, "opus22", "Opus v2.2") + ROMX_LOAD("opus-22.rom", 0x0000, 0x2000, CRC(50f0eae0) SHA1(0eee1c503f71709fce8b7560dadc2d07d15edb80), ROM_BIOS(0)) + ROM_SYSTEM_BIOS(1, "opus21", "Opus v2.1") + ROMX_LOAD("opus-21.rom", 0x0000, 0x2000, CRC(619973f9) SHA1(31999a68901392bba907cf5a15e264b6759f1a29), ROM_BIOS(1)) + ROM_SYSTEM_BIOS(2, "opus222", "Opus v2.22") + ROMX_LOAD("opus-222.rom", 0x0000, 0x2000, CRC(08ce9949) SHA1(71f1c8a8b923f7751d1ff48d30b8e18a15b92591), ROM_BIOS(2)) + ROM_SYSTEM_BIOS(3, "quickdos", "QuickDOS v2.31") // MegaSoft + ROMX_LOAD("quickdos-231.rom", 0x0000, 0x2000, CRC(d042b32a) SHA1(2975f7eb61d44e898cdd6e3196893e95637f17ff), ROM_BIOS(3)) + ROM_SYSTEM_BIOS(4, "excom", "EXCOM v2.28") // Paul Cheffings + ROMX_LOAD("excom-228.rom", 0x0000, 0x2000, CRC(29257418) SHA1(098a812c4707251f647553a2abc1436afa38f43c), ROM_BIOS(4)) +ROM_END + + +//------------------------------------------------- +// device_add_mconfig - add device configuration +//------------------------------------------------- + +void spectrum_opus_device::device_add_mconfig(machine_config &config) +{ + WD1770(config, m_fdc, 16_MHz_XTAL / 2); + m_fdc->drq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(spectrum_expansion_slot_device::nmi_w)); + + FLOPPY_CONNECTOR(config, "fdc:0", spectrum_floppies, "35dd", spectrum_opus_device::floppy_formats).enable_sound(true); + FLOPPY_CONNECTOR(config, "fdc:1", spectrum_floppies, "35dd", spectrum_opus_device::floppy_formats).enable_sound(true); + + /* parallel printer port */ + CENTRONICS(config, m_centronics, centronics_devices, "printer"); + m_centronics->ack_handler().set(m_pia, FUNC(pia6821_device::ca2_w)); + m_centronics->busy_handler().set(FUNC(spectrum_opus_device::busy_w)); + + /* pia */ + PIA6821(config, m_pia, 0); + m_pia->writepa_handler().set(FUNC(spectrum_opus_device::pia_out_a)); + m_pia->writepb_handler().set(FUNC(spectrum_opus_device::pia_out_b)); + m_pia->cb2_handler().set("centronics", FUNC(centronics_device::write_strobe)); + + /* software list */ + SOFTWARE_LIST(config, "flop_list").set_original("spectrum_flop_opus"); + + /* passthru without NMI */ + SPECTRUM_EXPANSION_SLOT(config, m_exp, spectrum_expansion_devices, nullptr); + m_exp->irq_handler().set(DEVICE_SELF_OWNER, FUNC(spectrum_expansion_slot_device::irq_w)); +} + +const tiny_rom_entry *spectrum_opus_device::device_rom_region() const +{ + return ROM_NAME( opus ); +} + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// spectrum_opus_device - constructor +//------------------------------------------------- + +spectrum_opus_device::spectrum_opus_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, SPECTRUM_OPUS, tag, owner, clock) + , device_spectrum_expansion_interface(mconfig, *this) + , m_joy(*this, "JOY") + , m_rom(*this, "rom") + , m_pia(*this, "pia") + , m_fdc(*this, "fdc") + , m_floppy0(*this, "fdc:0") + , m_floppy1(*this, "fdc:1") + , m_centronics(*this, "centronics") + , m_exp(*this, "exp") +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void spectrum_opus_device::device_start() +{ + memset(m_ram, 0, sizeof(m_ram)); + + save_item(NAME(m_romcs)); + save_item(NAME(m_ram)); + save_item(NAME(m_last_pc)); +} + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void spectrum_opus_device::device_reset() +{ + m_romcs = 0; + m_last_pc = 0x0000; +} + + +//************************************************************************** +// IMPLEMENTATION +//************************************************************************** + +READ_LINE_MEMBER(spectrum_opus_device::romcs) +{ + return m_romcs | m_exp->romcs(); +} + +void spectrum_opus_device::opcode_fetch(offs_t offset) +{ + m_exp->opcode_fetch(offset); + + if (!machine().side_effects_disabled()) + { + switch (m_last_pc) + { + case 0x0008: case 0x0048: case 0x1708: + m_romcs = 1; + break; + case 0x1748: + m_romcs = 0; + break; + } + } + m_last_pc = offset; +} + +uint8_t spectrum_opus_device::iorq_r(offs_t offset) +{ + uint8_t data = m_exp->iorq_r(offset); + + // PIA bit 7 is enable joystick and selected on A5 only + if (!BIT(m_pia->a_output(), 7) && (~offset & 0x20)) + { + data &= m_joy->read() & 0x1f; + } + return data; +} + +void spectrum_opus_device::iorq_w(offs_t offset, uint8_t data) +{ + m_exp->iorq_w(offset, data); +} + +uint8_t spectrum_opus_device::mreq_r(offs_t offset) +{ + uint8_t data = 0xff; + + if (m_romcs) + { + switch (offset & 0xf800) + { + case 0x0000: case 0x0800: case 0x1000: case 0x1800: + data = m_rom->base()[offset & 0x1fff]; + break; + case 0x2000: + data = m_ram[offset & 0x7ff]; + break; + case 0x2800: + data = m_fdc->read(offset & 0x03); + break; + case 0x3000: + data = m_pia->read(offset & 0x03); + break; + case 0x3800: // Extra 2K described in QuickDOS manual - not used + data = m_ram[offset & 0xfff]; + break; + } + } + + if (m_exp->romcs()) + data &= m_exp->mreq_r(offset); + + return data; +} + +void spectrum_opus_device::mreq_w(offs_t offset, uint8_t data) +{ + if (m_romcs) + { + switch (offset & 0xf800) + { + case 0x2000: + m_ram[offset & 0x7ff] = data; + break; + case 0x2800: + m_fdc->write(offset & 0x03, data); + break; + case 0x3000: + m_pia->write(offset & 0x03, data); + break; + case 0x3800: // Extra 2K described in QuickDOS manual - not used + m_ram[offset & 0xfff] = data; + break; + } + } + + if (m_exp->romcs()) + m_exp->mreq_w(offset, data); +} + +WRITE8_MEMBER(spectrum_opus_device::pia_out_a) +{ + floppy_image_device *floppy = nullptr; + + // bit 0, 1: drive select + if (!BIT(data, 0)) floppy = m_floppy1->get_device(); + if (!BIT(data, 1)) floppy = m_floppy0->get_device(); + m_fdc->set_floppy(floppy); + + // bit 4: side select + if (floppy) + floppy->ss_w(BIT(data, 4)); + + // bit 5: density + m_fdc->dden_w(BIT(data, 5)); +} + +WRITE8_MEMBER(spectrum_opus_device::pia_out_b) +{ + m_centronics->write_data1(BIT(data, 1)); + m_centronics->write_data2(BIT(data, 2)); + m_centronics->write_data3(BIT(data, 3)); + m_centronics->write_data4(BIT(data, 4)); + m_centronics->write_data5(BIT(data, 5)); + m_centronics->write_data6(BIT(data, 6)); + m_centronics->write_data7(BIT(data, 7)); +} + +WRITE_LINE_MEMBER(spectrum_opus_device::busy_w) +{ + m_pia->set_a_input(state << 6, 0xbf); +} |