// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************** P.R.E.S. Advanced Plus3/4 http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/PRES_AP3A.html TODO: - add spare ROM slot in AP3 and AP4, not AP3/4 **********************************************************************/ #include "emu.h" #include "ap34.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(ELECTRON_AP34, electron_ap34_device, "electron_ap34", "P.R.E.S. Advanced Plus 3/4") //------------------------------------------------- // FLOPPY_FORMATS( ap34 ) //------------------------------------------------- void electron_ap34_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 ap34_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_ap34_device::device_add_mconfig(machine_config &config) { /* fdc */ WD1770(config, m_fdc, DERIVED_CLOCK(1, 2)); FLOPPY_CONNECTOR(config, m_floppy[0], ap34_floppies, "525qd", electron_ap34_device::floppy_formats).enable_sound(true); FLOPPY_CONNECTOR(config, m_floppy[1], ap34_floppies, nullptr, electron_ap34_device::floppy_formats).enable_sound(true); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // electron_ap34_device - constructor //------------------------------------------------- electron_ap34_device::electron_ap34_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, ELECTRON_AP34, tag, owner, clock) , device_electron_cart_interface(mconfig, *this) , m_fdc(*this, "fdc") , m_floppy(*this, "fdc:%u", 0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void electron_ap34_device::device_start() { } //------------------------------------------------- // read - cartridge data read //------------------------------------------------- uint8_t electron_ap34_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) { if (m_ram.size() != 0 && romqa == 0 && offset >= 0x3000) { data = m_ram[offset & 0x0fff]; } else { data = m_rom[(offset & 0x3fff) | (romqa << 14)]; } } return data; } //------------------------------------------------- // write - cartridge data write //------------------------------------------------- void electron_ap34_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 (m_ram.size() != 0 && romqa == 0 && offset >= 0x3000) { m_ram[offset & 0x0fff] = data; } } } //************************************************************************** // IMPLEMENTATION //************************************************************************** void electron_ap34_device::wd1770_control_w(uint8_t data) { floppy_image_device *floppy = nullptr; // bit 0, 1: drive select if (BIT(data, 0)) floppy = m_floppy[0]->get_device(); if (BIT(data, 1)) floppy = m_floppy[1]->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: NMI - not connected //m_slot->nmi_w(!BIT(data, 4)); // bit 5: reset m_fdc->mr_w(BIT(data, 5)); }