// license: GPL-2.0+ // copyright-holders: Dirk Best /*************************************************************************** Silicon Disc ***************************************************************************/ #include "emu.h" #include "silicon_disc.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(EINSTEIN_SILICON_DISC, einstein_silicon_disc_device, "einstein_sd", "Einstein Silicon Disc") //------------------------------------------------- // device_address_map //------------------------------------------------- void einstein_silicon_disc_device::map(address_map &map) { map(0x08, 0x08).mirror(0xff00).w(FUNC(einstein_silicon_disc_device::sector_low_w)); map(0x09, 0x09).mirror(0xff00).w(FUNC(einstein_silicon_disc_device::sector_high_w)); } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- ROM_START( silicon_disc ) ROM_REGION(0x2000, "rom", 0) ROM_LOAD("sd11.bin", 0x0000, 0x2000, CRC(0e4f5e6d) SHA1(d0bc01e533d8963c596154435c5b2d156a96d470)) ROM_END const tiny_rom_entry *einstein_silicon_disc_device::device_rom_region() const { return ROM_NAME( silicon_disc ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // einstein_silicon_disc_device - constructor //------------------------------------------------- einstein_silicon_disc_device::einstein_silicon_disc_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, EINSTEIN_SILICON_DISC, tag, owner, clock), device_tatung_pipe_interface(mconfig, *this), m_rom(*this, "rom"), m_bios(*this, ":bios"), m_sector(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void einstein_silicon_disc_device::device_start() { // setup ram m_ram = std::make_unique(0x40000); memset(m_ram.get(), 0xff, 0x40000); // register for save states save_pointer(NAME(m_ram), 0x40000); save_item(NAME(m_sector)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void einstein_silicon_disc_device::device_reset() { // copy our rom into the main bios region so it will get picked up by the bank switching // not really part of the pipe interface cartridge but here for convenience, in reality // the rom gets put directly onto the main motherboard into the second empty socket memcpy(m_bios->base() + 0x4000, m_rom->base(), 0x2000); // install i/o ports io_space().install_device(0xf0, 0xff, *this, &einstein_silicon_disc_device::map); io_space().install_readwrite_handler(0xfa, 0xfa, 0, 0, 0xff00, read8sm_delegate(*this, FUNC(einstein_silicon_disc_device::ram_r)), write8sm_delegate(*this, FUNC(einstein_silicon_disc_device::ram_w))); } //************************************************************************** // IMPLEMENTATION //************************************************************************** void einstein_silicon_disc_device::sector_low_w(uint8_t data) { m_sector &= 0xff00; m_sector |= data; } void einstein_silicon_disc_device::sector_high_w(uint8_t data) { m_sector &= 0x00ff; m_sector |= ((data & 0x07) << 8); } // a8 to a14 are used to specify the byte in a 128-byte sector uint8_t einstein_silicon_disc_device::ram_r(offs_t offset) { return m_ram[(m_sector * 0x80) | ((offset >> 8) & 0x7f)]; } void einstein_silicon_disc_device::ram_w(offs_t offset, uint8_t data) { m_ram[(m_sector * 0x80) | ((offset >> 8) & 0x7f)] = data; }