// license:BSD-3-Clause // copyright-holders:Barry Rodewald /* X68000 Custom SASI HD controller */ #include "emu.h" enum { SASI_PHASE_BUSFREE = 0, SASI_PHASE_ARBITRATION, SASI_PHASE_SELECTION, SASI_PHASE_RESELECTION, SASI_PHASE_COMMAND, SASI_PHASE_DATA, SASI_PHASE_STATUS, SASI_PHASE_MESSAGE, SASI_PHASE_READ, SASI_PHASE_WRITE }; // SASI commands, based on the SASI standard enum { // Class 0 (6-byte) commands SASI_CMD_TEST_UNIT_READY = 0, SASI_CMD_REZERO_UNIT, SASI_CMD_RESERVED_02, SASI_CMD_REQUEST_SENSE, SASI_CMD_FORMAT_UNIT, SASI_CMD_RESERVED_05, SASI_CMD_FORMAT_UNIT_06, // the X68000 uses command 0x06 for Format Unit, despite the SASI specs saying 0x04 SASI_CMD_RESERVED_07, SASI_CMD_READ, SASI_CMD_RESERVED_09, SASI_CMD_WRITE, SASI_CMD_SEEK, SASI_CMD_RESERVED_0C, SASI_CMD_RESERVED_0D, SASI_CMD_RESERVED_0E, SASI_CMD_WRITE_FILE_MARK, SASI_CMD_INVALID_10, SASI_CMD_INVALID_11, SASI_CMD_RESERVE_UNIT, SASI_CMD_RELEASE_UNIT, SASI_CMD_INVALID_14, SASI_CMD_INVALID_15, SASI_CMD_READ_CAPACITY, SASI_CMD_INVALID_17, SASI_CMD_INVALID_18, SASI_CMD_INVALID_19, SASI_CMD_READ_DIAGNOSTIC, SASI_CMD_WRITE_DIAGNOSTIC, SASI_CMD_INVALID_1C, SASI_CMD_INVALID_1D, SASI_CMD_INVALID_1E, SASI_CMD_INQUIRY, // Class 1 commands (yes, just the one) SASI_CMD_RESERVED_20, SASI_CMD_RESERVED_21, SASI_CMD_RESERVED_22, SASI_CMD_SET_BLOCK_LIMITS = 0x28, // Class 2 commands SASI_CMD_EXTENDED_ADDRESS_READ = 0x48, SASI_CMD_INVALID_49, SASI_CMD_EXTENDED_ADDRESS_WRITE, SASI_CMD_WRITE_AND_VERIFY = 0x54, SASI_CMD_VERIFY, SASI_CMD_INVALID_56, SASI_CMD_SEARCH_DATA_HIGH, SASI_CMD_SEARCH_DATA_EQUAL, SASI_CMD_SEARCH_DATA_LOW, // controller-specific commands SASI_CMD_SPECIFY = 0xc2 }; class x68k_hdc_image_device : public device_t, public device_image_interface { public: // construction/destruction x68k_hdc_image_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); // image-level overrides virtual iodevice_t image_type() const { return IO_HARDDISK; } virtual bool is_readable() const { return 1; } virtual bool is_writeable() const { return 1; } virtual bool is_creatable() const { return 1; } virtual bool must_be_loaded() const { return 0; } virtual bool is_reset_on_load() const { return 0; } virtual const char *image_interface() const { return nullptr; } virtual const char *file_extensions() const { return "hdf"; } virtual const option_guide *create_option_guide() const { return nullptr; } virtual bool call_create(int format_type, option_resolution *format_options); DECLARE_WRITE16_MEMBER( hdc_w ); DECLARE_READ16_MEMBER( hdc_r ); protected: // device-level overrides virtual void device_config_complete(); virtual void device_start(); virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr); private: int m_phase; unsigned char m_status_port; // read at 0xe96003 unsigned char m_status; // status phase output //unsigned char m_message; unsigned char m_command[10]; unsigned char m_sense[4]; int m_command_byte_count; int m_command_byte_total; int m_current_command; int m_transfer_byte_count; int m_transfer_byte_total; int m_msg; // MSG int m_cd; // C/D (Command/Data) int m_bsy; // BSY int m_io; // I/O int m_req; // REQ }; // device type definition extern const device_type X68KHDC; #define MCFG_X68KHDC_ADD(_tag) \ MCFG_DEVICE_ADD(_tag, X68KHDC, 0)