// license:BSD-3-Clause // copyright-holders:Barry Rodewald /* X68000 Custom SASI HD controller */ #ifndef MAME_MACHINE_X68K_HDC_H #define MAME_MACHINE_X68K_HDC_H #pragma once class x68k_hdc_image_device : public device_t, public device_image_interface { enum class sasi_phase : u8 { BUSFREE = 0, ARBITRATION, SELECTION, RESELECTION, COMMAND, DATA, STATUS, MESSAGE, READ, WRITE }; // SASI commands, based on the SASI standard enum sasi_cmd : u8 { // 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 }; enum sasi_status : u8 { SASI_STATUS_MSG = 1 << 4, // MSG SASI_STATUS_CD = 1 << 3, // C/D (Command/Data) SASI_STATUS_IO = 1 << 2, // I/O SASI_STATUS_BSY = 1 << 1, // BSY SASI_STATUS_REQ = 1 << 0 // REQ }; public: // construction/destruction x68k_hdc_image_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0); // image-level overrides virtual iodevice_t image_type() const noexcept override { return IO_HARDDISK; } virtual bool is_readable() const noexcept override { return true; } virtual bool is_writeable() const noexcept override { return true; } virtual bool is_creatable() const noexcept override { return true; } virtual bool must_be_loaded() const noexcept override { return false; } virtual bool is_reset_on_load() const noexcept override { return false; } virtual const char *file_extensions() const noexcept override { return "hdf"; } virtual const char *custom_instance_name() const noexcept override { return "sasihd"; } virtual const char *custom_brief_instance_name() const noexcept override { return "sasi"; } virtual image_init_result call_create(int format_type, util::option_resolution *format_options) override; DECLARE_WRITE16_MEMBER( hdc_w ); DECLARE_READ16_MEMBER( hdc_r ); protected: // device-level overrides virtual void device_start() override; private: TIMER_CALLBACK_MEMBER(req_timer_callback); sasi_phase m_phase; u8 m_status_port; // read at 0xe96003 u8 m_status; // status phase output u8 m_command[10]; u8 m_sense[4]; u16 m_command_byte_count; u16 m_command_byte_total; u8 m_current_command; u16 m_transfer_byte_count; u16 m_transfer_byte_total; emu_timer *m_req_timer; }; // device type definition DECLARE_DEVICE_TYPE(X68KHDC, x68k_hdc_image_device) #endif // MAME_MACHINE_X68K_HDC_H