// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************** Slogger Pegasus 400 disk interface TODO: - add spare ROM slot **********************************************************************/ #include "emu.h" #include "peg400.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(ELECTRON_PEG400, electron_peg400_device, "electron_peg400", "Slogger Pegasus 400 disk interface") //------------------------------------------------- // FLOPPY_FORMATS( peg400 ) //------------------------------------------------- void electron_peg400_device::floppy_formats(format_registration &fr) { fr.add_mfm_containers(); fr.add(FLOPPY_ACORN_SSD_FORMAT); fr.add(FLOPPY_ACORN_DSD_FORMAT); fr.add(FLOPPY_ACORN_ADFS_OLD_FORMAT); } void peg400_floppies(device_slot_interface &device) { device.option_add("35dd", FLOPPY_35_DD); device.option_add("525qd", FLOPPY_525_QD); } //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void electron_peg400_device::device_add_mconfig(machine_config &config) { /* fdc */ WD1770(config, m_fdc, DERIVED_CLOCK(1, 2)); m_fdc->drq_wr_callback().set(FUNC(electron_peg400_device::fdc_drq_w)); FLOPPY_CONNECTOR(config, m_floppy0, peg400_floppies, "525qd", electron_peg400_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, m_floppy1, peg400_floppies, nullptr, electron_peg400_device::floppy_formats).enable_sound(true); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // electron_peg400_device - constructor //------------------------------------------------- electron_peg400_device::electron_peg400_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, ELECTRON_PEG400, tag, owner, clock) , device_electron_cart_interface(mconfig, *this) , m_fdc(*this, "fdc") , m_floppy0(*this, "fdc:0") , m_floppy1(*this, "fdc:1") { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void electron_peg400_device::device_start() { } //------------------------------------------------- // read - cartridge data read //------------------------------------------------- uint8_t electron_peg400_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2) { uint8_t data = 0xff; if (infc) { switch (offset & 0xfc) { case 0xc4: data = m_fdc->read(offset & 0x03); break; } } else if (oe) { switch (romqa) { case 0: if (offset < 0x3800) { data = m_rom[(offset & 0x3fff) | (romqa << 14)]; } else { data = m_ram[offset & 0x07ff]; } break; case 1: data = m_rom[(offset & 0x3fff) | (romqa << 14)]; break; } } return data; } //------------------------------------------------- // write - cartridge data write //------------------------------------------------- void electron_peg400_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2) { if (infc) { switch (offset & 0xfc) { case 0xc0: wd1770_control_w(data); break; case 0xc4: m_fdc->write(offset & 0x03, data); break; } } else if (oe) { if (romqa == 0 && offset >= 0x3800) { m_ram[offset & 0x07ff] = data; } } } //************************************************************************** // IMPLEMENTATION //************************************************************************** void electron_peg400_device::wd1770_control_w(uint8_t data) { floppy_image_device *floppy = nullptr; // bit 0, 1: drive select if (BIT(data, 0)) floppy = m_floppy0->get_device(); if (BIT(data, 1)) floppy = m_floppy1->get_device(); m_fdc->set_floppy(floppy); // bit 2: side select if (floppy) floppy->ss_w(BIT(data, 2)); // bit 3: density m_fdc->dden_w(BIT(data, 3)); // bit 4: send DRQ to NMI signal m_fdc_ie = BIT(data, 4); // bit 5: head load } WRITE_LINE_MEMBER(electron_peg400_device::fdc_drq_w) { m_slot->nmi_w((state && m_fdc_ie) ? ASSERT_LINE : CLEAR_LINE); }