// license:BSD-3-Clause // copyright-holders:MetalliC /********************************************************************* Speccy-DOS Interface (c) 1987? Philips(?) WD1770/2-based floppy drive interface with 1K RAM and 8K ROM, presumable developed by Philips & MBLE Belgium, had some popularity in Hungary. Main commands: LIST * - list disc contents LOAD *"filename" - load and run program SAVE *"filename" - save program FORMAT *"diskname"dd80 - format double side double density 80 tracks disk ASN *drive# - change drive Manual: https://sinclair.hu/speccyalista/konyvtar/kezikonyvek/SpeccyDOSv4_manual.pdf Partially compatible with Spectrum128, useable after "USR 0" from basic128 or switch to 48K mode. Notes / TODOs: - address decoding performed by large DIP28 chip, probably PROM, not dumped, exact logic is not known. - program ROMs have swapped data lines/bits 1 and 5. - original software disc mentioned in manual is missing. - Magic/NMI function require NMI routine preloaded in RAM by "MAGIC2.x" program (which is missing). *********************************************************************/ #include "emu.h" #include "speccydos.h" /*************************************************************************** DEVICE DEFINITIONS ***************************************************************************/ DEFINE_DEVICE_TYPE(SPECTRUM_SPECCYDOS, spectrum_speccydos_device, "spectrum_speccydos", "Speccy-DOS Interface") //------------------------------------------------- // INPUT_PORTS //------------------------------------------------- INPUT_PORTS_START(speccydos) PORT_START("BUTTON") PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_NAME("Magic Button") PORT_CODE(KEYCODE_MINUS_PAD) PORT_CHANGED_MEMBER(DEVICE_SELF, spectrum_speccydos_device, magic_button, 0) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor spectrum_speccydos_device::device_input_ports() const { return INPUT_PORTS_NAME(speccydos); } //------------------------------------------------- // SLOT_INTERFACE( floppies ) //------------------------------------------------- static void speccydos_floppies(device_slot_interface &device) { device.option_add("525sssd_35t", FLOPPY_525_SSSD_35T); device.option_add("525ssdd", FLOPPY_525_SSDD); device.option_add("525dsdd", FLOPPY_525_DD); device.option_add("525ssqd", FLOPPY_525_SSQD); device.option_add("525dsqd", FLOPPY_525_QD); device.option_add("35ssdd", FLOPPY_35_SSDD); device.option_add("35dsdd", FLOPPY_35_DD); } //------------------------------------------------- // floppy_formats //------------------------------------------------- void spectrum_speccydos_device::floppy_formats(format_registration &fr) { fr.add_mfm_containers(); fr.add(FLOPPY_SDD_FORMAT); } //------------------------------------------------- // ROM( speccydos ) //------------------------------------------------- ROM_START(speccydos) ROM_REGION(0x2000, "rom", 0) ROM_DEFAULT_BIOS("sdos42") ROM_SYSTEM_BIOS(0, "sdos41", "Speccy DOS v4.1") ROMX_LOAD("sdos41.bin", 0x0000, 0x2000, CRC(fcfa6dac) SHA1(bcae27b334bbbee257900682859132f476c3be99), ROM_BIOS(0)) ROM_SYSTEM_BIOS(1, "sdos42", "Speccy DOS v4.2 (WD1770)") ROMX_LOAD("sdos42.bin", 0x0000, 0x2000, CRC(208e7baa) SHA1(80e82c1dd77ff04b86989f7d2a25d93c5aa1dc42), ROM_BIOS(1)) ROM_SYSTEM_BIOS(2, "sdos422", "Speccy DOS v4.2 (WD1772)") // only 4 byte different from above - step rates for 1772 ROMX_LOAD("sdos422.bin", 0x0000, 0x2000, CRC(a7317e1d) SHA1(e72d2ea19cbe8f3459e4fc9d3c57975dc9917bd6), ROM_BIOS(2)) ROM_END //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void spectrum_speccydos_device::device_add_mconfig(machine_config &config) { WD1770(config, m_fdc, 8_MHz_XTAL); FLOPPY_CONNECTOR(config, "fdc:0", speccydos_floppies, "525dsqd", spectrum_speccydos_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, "fdc:1", speccydos_floppies, "525dsqd", spectrum_speccydos_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, "fdc:2", speccydos_floppies, nullptr, spectrum_speccydos_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, "fdc:3", speccydos_floppies, nullptr, spectrum_speccydos_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_speccydos_device::device_rom_region() const { return ROM_NAME(speccydos); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // spectrum_speccydos_device - constructor //------------------------------------------------- spectrum_speccydos_device::spectrum_speccydos_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, SPECTRUM_SPECCYDOS, 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") { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void spectrum_speccydos_device::device_start() { memset(m_ram, 0, sizeof(m_ram)); save_item(NAME(m_romcs)); save_item(NAME(m_control)); save_item(NAME(m_ram)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void spectrum_speccydos_device::device_reset() { m_romcs = 0; m_control = 0; } //************************************************************************** // IMPLEMENTATION //************************************************************************** READ_LINE_MEMBER(spectrum_speccydos_device::romcs) { return m_romcs | m_exp->romcs(); } void spectrum_speccydos_device::pre_opcode_fetch(offs_t offset) { m_exp->pre_opcode_fetch(offset); if (!machine().side_effects_disabled()) { switch (offset) { case 0x0066: case 0x1292: case 0x1b41: if (!BIT(m_control, 6)) m_romcs = 1; break; } } } uint8_t spectrum_speccydos_device::mreq_r(offs_t offset) { u8 data = 0xff; if (m_romcs) { if (offset < 0x2000) { data = m_rom->base()[offset]; data = bitswap<8>(data, 7, 6, 1, 4, 3, 2, 5, 0); } else if (offset < 0x2400) data = m_ram[offset & 0x3ff]; else if (offset >= 0x3290 && offset < 0x3294) data = m_fdc->read(offset & 3); else logerror("SpeccyDOS unhandled read %04X\n", offset); } if (m_exp->romcs()) data &= m_exp->mreq_r(offset); return data; } void spectrum_speccydos_device::mreq_w(offs_t offset, uint8_t data) { if (offset == 0x3b41) { m_control = data; floppy_image_device* floppy = m_floppy[data & 3]->get_device(); m_fdc->set_floppy(floppy); if (floppy) floppy->ss_w(BIT(data, 2)); m_fdc->dden_w(BIT(data, 7)); m_romcs = BIT(data, 6) ? 0 : BIT(data, 3); } else if (m_romcs) { if (offset >= 0x2000 && offset < 0x2400) m_ram[offset & 0x3ff] = data; else if (offset >= 0x3290 && offset < 0x3294) m_fdc->write(offset & 3, data); else { logerror("SpeccyDOS unhandled write %04X %02X\n", offset, data); //machine().debug_break(); } } if (m_exp->romcs()) m_exp->mreq_w(offset, data); }