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Diffstat (limited to 'src/devices/bus/msx/cart/quickdisk.cpp')
-rw-r--r--src/devices/bus/msx/cart/quickdisk.cpp124
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")