diff options
Diffstat (limited to 'src/devices/bus/msx/cart/quickdisk.cpp')
-rw-r--r-- | src/devices/bus/msx/cart/quickdisk.cpp | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/devices/bus/msx/cart/quickdisk.cpp b/src/devices/bus/msx/cart/quickdisk.cpp new file mode 100644 index 00000000000..11ce70ac2a2 --- /dev/null +++ b/src/devices/bus/msx/cart/quickdisk.cpp @@ -0,0 +1,124 @@ +// 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<z80sio_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") |