// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************* Technology Research Beta 128 Disk interface This hardware type runs TR-DOS 5.xx (official) and newer unofficial updates. It was designed to work properly with the 128k machines that had issues with the original Beta Disk due to changes in the 128k ROM structure etc. (enable address is moved from 3cxx to 3dxx for example) TODO: original ROMs should have bits 0 and 7 swapped there were many unofficial ROMs available for this, make them available for use. *********************************************************************/ #include "emu.h" #include "beta128.h" /*************************************************************************** DEVICE DEFINITIONS ***************************************************************************/ DEFINE_DEVICE_TYPE(SPECTRUM_BETA128, spectrum_beta128_device, "spectrum_beta128", "TR Beta 128 Disk Interface") //------------------------------------------------- // INPUT_PORTS( beta128 ) //------------------------------------------------- INPUT_PORTS_START(beta128) PORT_START("BUTTON") // don't use F12, it clashes with the 'exit from debugger' button PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_NAME("Magic Button") PORT_CODE(KEYCODE_MINUS_PAD) PORT_CHANGED_MEMBER(DEVICE_SELF, spectrum_beta128_device, magic_button, 0) PORT_START("SWITCH") PORT_CONFNAME(0x03, 0x01, "System Switch") //PORT_CHANGED_MEMBER(DEVICE_SELF, spectrum_beta128_device, switch_changed, 0) PORT_CONFSETTING(0x00, "Off (128)") PORT_CONFSETTING(0x01, "Normal (auto-boot)") // also enable Beta-disk V3/V4 compatibility, auto-boot feature does not work on Spectrum128. //PORT_CONFSETTING(0x02, "Reset") // TODO: implement RESET callback INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor spectrum_beta128_device::device_input_ports() const { return INPUT_PORTS_NAME(beta128); } //------------------------------------------------- // SLOT_INTERFACE( beta_floppies ) //------------------------------------------------- static void beta_floppies(device_slot_interface &device) { device.option_add("525qd", FLOPPY_525_QD); } //------------------------------------------------- // floppy_formats //------------------------------------------------- void spectrum_beta128_device::floppy_formats(format_registration &fr) { fr.add_mfm_containers(); fr.add(FLOPPY_TRD_FORMAT); } //------------------------------------------------- // ROM( beta ) //------------------------------------------------- ROM_START(beta128) ROM_REGION(0x4000, "rom", 0) ROM_DEFAULT_BIOS("trd503") // original, but in plain form, should be replaced with "proper dumps" with data bits 0 and 7 swapped ROM_SYSTEM_BIOS(0, "trd501", "TR-DOS v5.01") ROMX_LOAD("trd501.rom", 0x0000, 0x4000, CRC(3e3cdd4c) SHA1(8303ba0cc79daa6c04cd1e6ce27e8b6886a3f0de), ROM_BIOS(0)) ROM_SYSTEM_BIOS(1, "trd502", "TR-DOS v5.02") ROMX_LOAD("trd502.rom", 0x0000, 0x4000, CRC(64f0fcf8) SHA1(862e0af2245f68fca3d6a5b10186d09fd1faee55), ROM_BIOS(1)) ROM_SYSTEM_BIOS(2, "trd503", "TR-DOS v5.03") ROMX_LOAD("trd503.rom", 0x0000, 0x4000, CRC(10751aba) SHA1(21695e3f2a8f796386ce66eea8a246b0ac44810c), ROM_BIOS(2)) // clone/homebrew modifications based on original v5.03 ROM_SYSTEM_BIOS(3, "trd504t", "TR-DOS v5.04T (hack)") // increased step rate (6ms), FORMAT command got interleave 1:1 option for faster read/write speed, this firmware was most common at post-soviet space in 90x. ROMX_LOAD("trd504t.rom", 0x0000, 0x4000, CRC(e212d1e0) SHA1(745e9caf576e64a5386ad845256d28593d34cc40), ROM_BIOS(3)) // trd504.rom CRC ba310874 is bad dump of 5.03 with edited version text, no actual code changes. ROM_END //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void spectrum_beta128_device::device_add_mconfig(machine_config &config) { FD1793(config, m_fdc, 4_MHz_XTAL / 4); m_fdc->hld_wr_callback().set(FUNC(spectrum_beta128_device::fdc_hld_w)); //KR1818VG93(config, m_fdc, 4_MHz_XTAL / 4); FLOPPY_CONNECTOR(config, "fdc:0", beta_floppies, "525qd", spectrum_beta128_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, "fdc:1", beta_floppies, "525qd", spectrum_beta128_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, "fdc:2", beta_floppies, nullptr, spectrum_beta128_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, "fdc:3", beta_floppies, nullptr, spectrum_beta128_device::floppy_formats).enable_sound(true); // passthru 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)); m_exp->nmi_handler().set(DEVICE_SELF_OWNER, FUNC(spectrum_expansion_slot_device::nmi_w)); m_exp->fb_r_handler().set(DEVICE_SELF_OWNER, FUNC(spectrum_expansion_slot_device::fb_r)); } const tiny_rom_entry *spectrum_beta128_device::device_rom_region() const { return ROM_NAME(beta128); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // spectrum_beta128_device - constructor //------------------------------------------------- spectrum_beta128_device::spectrum_beta128_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, SPECTRUM_BETA128, tag, owner, clock) , device_spectrum_expansion_interface(mconfig, *this) , m_rom(*this, "rom") , m_fdc(*this, "fdc") , m_floppy(*this, "fdc:%u", 0) , m_exp(*this, "exp") , m_switch(*this, "SWITCH") , m_control(0) , m_motor_active(false) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void spectrum_beta128_device::device_start() { save_item(NAME(m_romcs)); save_item(NAME(m_control)); save_item(NAME(m_motor_active)); save_item(NAME(m_128rom_bit)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void spectrum_beta128_device::device_reset() { // Page in the ROM if auto-boot is selected if (m_switch->read() == 0x01) m_romcs = 1; else m_romcs = 0; m_128rom_bit = true; } //************************************************************************** // IMPLEMENTATION //************************************************************************** READ_LINE_MEMBER(spectrum_beta128_device::romcs) { return m_romcs | m_exp->romcs(); } void spectrum_beta128_device::pre_opcode_fetch(offs_t offset) { m_exp->pre_opcode_fetch(offset); if (!machine().side_effects_disabled()) { u8 offs = offset >> 8; if (offs == 0x3d && m_128rom_bit) m_romcs = 1; else if (offs == 0x3c && m_128rom_bit && m_switch->read() == 0x01) m_romcs = 1; else if (offs >= 0x40) m_romcs = 0; } } uint8_t spectrum_beta128_device::iorq_r(offs_t offset) { uint8_t data = 0xff; if (m_romcs) { switch (offset & 0x83) { case 0x03: data = m_fdc->read((offset >> 5) & 0x03); break; case 0x83: data &= 0x3f; // actually open bus data |= m_fdc->drq_r() ? 0x40 : 0; data |= m_fdc->intrq_r() ? 0x80 : 0; break; } } else data = m_exp->iorq_r(offset); return data; } void spectrum_beta128_device::iorq_w(offs_t offset, uint8_t data) { if ((offset & 0x8002) == 0) m_128rom_bit = bool(data & 0x10); if (m_romcs) { switch (offset & 0x83) { case 0x03: m_fdc->write((offset >> 5) & 0x03, data); break; case 0x83: floppy_image_device* floppy = m_floppy[data & 3]->get_device(); m_control = data; m_fdc->set_floppy(floppy); if (floppy) floppy->ss_w(BIT(data, 4) ? 0 : 1); m_fdc->dden_w(BIT(data, 6)); m_fdc->hlt_w(BIT(data, 3)); // bit 3 also connected to FDC /IP pin via diode, AND logic: if this bit is 0 - /IP will be forcibly set to low. // used for bitbang index pulses generation to stop FDD drive motor with no disk inserted, currently not emulated. m_fdc->mr_w(BIT(data, 2)); motors_control(); break; } } else m_exp->iorq_w(offset, data); } uint8_t spectrum_beta128_device::mreq_r(offs_t offset) { uint8_t data = 0xff; if (m_romcs) { data = m_rom->base()[offset & 0x3fff]; } if (m_exp->romcs()) data &= m_exp->mreq_r(offset); return data; } INPUT_CHANGED_MEMBER(spectrum_beta128_device::magic_button) { if (newval && !oldval) { m_romcs = 1; m_slot->nmi_w(ASSERT_LINE); } else { m_slot->nmi_w(CLEAR_LINE); } } void spectrum_beta128_device::fdc_hld_w(int state) { m_fdc->set_force_ready(state); // HLD connected to RDY pin m_motor_active = state; motors_control(); } void spectrum_beta128_device::motors_control() { for (int i = 0; i < 4; i++) { floppy_image_device* floppy = m_floppy[i]->get_device(); if (!floppy) continue; if (m_motor_active && (m_control & 3) == i) floppy->mon_w(CLEAR_LINE); else floppy->mon_w(ASSERT_LINE); } }