// license:BSD-3-Clause // copyright-holders:Wilbert Pol #include "emu.h" #include "quickdisk.h" #include "machine/z80sio.h" /********************************************************************************** Emulation of MSX QuickDisk interfaces. All known MSX QuickDisk interfaces contain 8KB ROM, 2KB RAM, and are connected to a Mitsumi QuickDisk drive. TODO: - Implement a quick disk drive and connect it to the SIO. - Dumps of MSX QuickDisks. **********************************************************************************/ //#define VERBOSE (1) //#define LOG_OUTPUT_FUNC osd_printf_info #include "logmacro.h" namespace { class msx_cart_quickdisk_device : public device_t, public msx_cart_interface { public: msx_cart_quickdisk_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, MSX_CART_QUICKDISK, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_sio(*this, "sio") { } virtual std::error_condition initialize_cartridge(std::string &message) override; static constexpr feature_type unemulated_features() { return feature::DISK; } protected: virtual void device_start() override { } virtual void device_add_mconfig(machine_config &config) override ATTR_COLD; private: required_device m_sio; void rtsa_w(int state); void rtsb_w(int state); void dtra_w(int state); void dtrb_w(int state); }; void msx_cart_quickdisk_device::device_add_mconfig(machine_config &config) { Z80SIO(config, m_sio, 6.5_MHz_XTAL); m_sio->out_int_callback().set(*this, FUNC(msx_cart_quickdisk_device::irq_out)); m_sio->out_rtsa_callback().set(*this, FUNC(msx_cart_quickdisk_device::rtsa_w)); // RTSA - write enable m_sio->out_rtsb_callback().set(*this, FUNC(msx_cart_quickdisk_device::rtsb_w)); // RTSB - mfm demodulator? m_sio->out_dtra_callback().set(*this, FUNC(msx_cart_quickdisk_device::dtra_w)); // DTRA - not used m_sio->out_dtrb_callback().set(*this, FUNC(msx_cart_quickdisk_device::dtrb_w)); // DTRB - motor on // CTSA - media write protected // CTSB - not used // DCDA - media inserted // DCDB - ready } std::error_condition msx_cart_quickdisk_device::initialize_cartridge(std::string &message) { if (!cart_rom_region()) { message = "msx_cart_quickdisk_device: Required region 'rom' was not found."; return image_error::INTERNAL; } if (cart_rom_region()->bytes() != 0x2000) { message = "msx_cart_quickdisk_device: Region 'rom' has unsupported size."; return image_error::INVALIDLENGTH; } if (!cart_ram_region()) { message = "msx_cart_quickdisk_device: Required region 'ram' was not found."; return image_error::INTERNAL; } if (cart_ram_region()->bytes() != 0x800) { message = "msx_cart_quickdisk_device: Region 'ram' has unsupported size."; return image_error::INVALIDLENGTH; } page(1)->install_rom(0x4000, 0x5fff, cart_rom_region()->base()); page(1)->install_read_handler(0x6000, 0x6003, emu::rw_delegate(m_sio, FUNC(z80sio_device::cd_ba_r))); page(1)->install_write_handler(0x6000, 0x6003, emu::rw_delegate(m_sio, FUNC(z80sio_device::cd_ba_w))); page(1)->install_ram(0x7000, 0x77ff, cart_ram_region()->base()); return std::error_condition(); } void msx_cart_quickdisk_device::rtsa_w(int state) { LOG("RTSA / write enable: %d\n", state); } void msx_cart_quickdisk_device::rtsb_w(int state) { LOG("RTSB / mfm demodulator: %d\n", state); } void msx_cart_quickdisk_device::dtra_w(int state) { LOG("DTRA / not used: %d\n", state); } void msx_cart_quickdisk_device::dtrb_w(int state) { LOG("DTRB / motor on: %d\n", state); } } // anonymous namespace DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_QUICKDISK, msx_cart_interface, msx_cart_quickdisk_device, "msx_cart_quickdisk", "Quickdisk Interface")