// license: GPL-2.0+ // copyright-holders: Dirk Best /*************************************************************************** BennVenn SD Loader for VZ300 Notes: - Also works for VZ200 TODO: - No SD card emulation, so only the memory expansion part works ***************************************************************************/ #include "emu.h" #include "sdloader.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(VTECH_SDLOADER, vtech_sdloader_device, "vtech_sdloader", "BennVenn SD Loader") //------------------------------------------------- // mem_map - memory space address map //------------------------------------------------- void vtech_sdloader_device::mem_map(address_map &map) { map.unmap_value_high(); map(0x4000, 0x67ff).view(m_dosview); m_dosview[0](0x4000, 0x67ff).rom().region("software", 0).bankw(m_dosbank); m_dosview[1](0x4000, 0x67ff).bankrw(m_dosbank); map(0x9000, 0xffff).rw(FUNC(vtech_sdloader_device::exp_ram_r), FUNC(vtech_sdloader_device::exp_ram_w)); } //------------------------------------------------- // io_map - io space address map //------------------------------------------------- void vtech_sdloader_device::io_map(address_map &map) { map.unmap_value_high(); map(0x37, 0x37).w(FUNC(vtech_sdloader_device::mapper_w)); map(0x38, 0x38).w(FUNC(vtech_sdloader_device::sdcfg_w)); map(0x39, 0x39).rw(FUNC(vtech_sdloader_device::sdio_r), FUNC(vtech_sdloader_device::sdio_w)); map(0x3a, 0x3a).w(FUNC(vtech_sdloader_device::mode_w)); } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- ROM_START( sdloader ) ROM_REGION(0x2800, "software", 0) ROM_DEFAULT_BIOS("18") ROM_SYSTEM_BIOS(0, "15", "Version 1.5") ROMX_LOAD("vzdos15.bin", 0x0000, 0x16c2, CRC(828f7703) SHA1(150c6e5a8f20416c0dab1fa96f68726f415a8b7e), ROM_BIOS(0)) ROM_SYSTEM_BIOS(1, "17", "Version 1.7") ROMX_LOAD("vzdos17.bin", 0x0000, 0x1783, CRC(7ef7fb1e) SHA1(6278ac675d6c08dca39a5a7f4c72988a178eff8a), ROM_BIOS(1)) ROM_SYSTEM_BIOS(2, "18", "Version 1.8") ROMX_LOAD("vzdos18.bin", 0x0000, 0x1795, CRC(2b1cec28) SHA1(d4f8fa0c7a70984334be3e5c831017cfc53683b2), ROM_BIOS(2)) ROM_END const tiny_rom_entry *vtech_sdloader_device::device_rom_region() const { return ROM_NAME( sdloader ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // vtech_sdloader_device - constructor //------------------------------------------------- vtech_sdloader_device::vtech_sdloader_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : vtech_memexp_device(mconfig, VTECH_SDLOADER, tag, owner, clock), m_dosbank(*this, "dosbank"), m_dosview(*this, "dosview"), m_expbank(*this, "expbank"), m_vz300_mode(false) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void vtech_sdloader_device::device_start() { vtech_memexp_device::device_start(); // init ram m_ram = std::make_unique(0x20000); // configure banks m_dosbank->configure_entry(0, m_ram.get() + 0x00000); m_dosbank->configure_entry(1, m_ram.get() + 0x08000); m_expbank->configure_entry(0, m_ram.get() + 0x10000); m_expbank->configure_entry(1, m_ram.get() + 0x18000); // register for savestates save_item(NAME(m_vz300_mode)); save_pointer(NAME(m_ram), 0x20000); } //------------------------------------------------- // device_reset - device-specific startup //------------------------------------------------- void vtech_sdloader_device::device_reset() { // startup in vz200 mode m_vz300_mode = false; // rom enabled m_dosview.select(0); } //************************************************************************** // IMPLEMENTATION //************************************************************************** void vtech_sdloader_device::mapper_w(uint8_t data) { // 7654---- not used // ----3--- led // -----2-- expansion ram bank // ------1- dos ram bank // -------0 dos rom/ram switch m_dosview.select(BIT(data, 0)); m_dosbank->set_entry(BIT(data, 1)); m_expbank->set_entry(BIT(data, 2)); } void vtech_sdloader_device::sdcfg_w(uint8_t data) { logerror("sdcfg_w: %02x\n", data); } uint8_t vtech_sdloader_device::sdio_r() { logerror("sdio_r\n"); return 0xff; } void vtech_sdloader_device::sdio_w(uint8_t data) { logerror("sdio_w: %02x\n", data); } void vtech_sdloader_device::mode_w(uint8_t data) { logerror("Switching to %s mode\n", BIT(data, 0) ? "VZ-300" : "VZ-200"); m_vz300_mode = bool(BIT(data, 0)); } uint8_t vtech_sdloader_device::exp_ram_r(offs_t offset) { offset += 0x9000; if (!m_vz300_mode || (m_vz300_mode && offset >= 0xb800)) return reinterpret_cast(m_expbank->base())[offset & 0x7fff]; return 0xff; } void vtech_sdloader_device::exp_ram_w(offs_t offset, uint8_t data) { offset += 0x9000; if (!m_vz300_mode || (m_vz300_mode && offset >= 0xb800)) reinterpret_cast(m_expbank->base())[offset & 0x7fff] = data; }