mirror of
https://github.com/holub/mame
synced 2025-05-25 07:15:25 +03:00
129 lines
3.3 KiB
C++
129 lines
3.3 KiB
C++
/*
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X68000 Custom SASI HD controller
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*/
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#include "emu.h"
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enum
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{
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SASI_PHASE_BUSFREE = 0,
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SASI_PHASE_ARBITRATION,
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SASI_PHASE_SELECTION,
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SASI_PHASE_RESELECTION,
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SASI_PHASE_COMMAND,
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SASI_PHASE_DATA,
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SASI_PHASE_STATUS,
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SASI_PHASE_MESSAGE,
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SASI_PHASE_READ,
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SASI_PHASE_WRITE
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};
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// SASI commands, based on the SASI standard
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enum
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{
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// Class 0 (6-byte) commands
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SASI_CMD_TEST_UNIT_READY = 0,
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SASI_CMD_REZERO_UNIT,
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SASI_CMD_RESERVED_02,
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SASI_CMD_REQUEST_SENSE,
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SASI_CMD_FORMAT_UNIT,
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SASI_CMD_RESERVED_05,
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SASI_CMD_FORMAT_UNIT_06, // the X68000 uses command 0x06 for Format Unit, despite the SASI specs saying 0x04
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SASI_CMD_RESERVED_07,
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SASI_CMD_READ,
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SASI_CMD_RESERVED_09,
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SASI_CMD_WRITE,
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SASI_CMD_SEEK,
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SASI_CMD_RESERVED_0C,
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SASI_CMD_RESERVED_0D,
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SASI_CMD_RESERVED_0E,
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SASI_CMD_WRITE_FILE_MARK,
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SASI_CMD_INVALID_10,
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SASI_CMD_INVALID_11,
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SASI_CMD_RESERVE_UNIT,
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SASI_CMD_RELEASE_UNIT,
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SASI_CMD_INVALID_14,
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SASI_CMD_INVALID_15,
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SASI_CMD_READ_CAPACITY,
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SASI_CMD_INVALID_17,
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SASI_CMD_INVALID_18,
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SASI_CMD_INVALID_19,
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SASI_CMD_READ_DIAGNOSTIC,
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SASI_CMD_WRITE_DIAGNOSTIC,
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SASI_CMD_INVALID_1C,
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SASI_CMD_INVALID_1D,
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SASI_CMD_INVALID_1E,
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SASI_CMD_INQUIRY,
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// Class 1 commands (yes, just the one)
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SASI_CMD_RESERVED_20,
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SASI_CMD_RESERVED_21,
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SASI_CMD_RESERVED_22,
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SASI_CMD_SET_BLOCK_LIMITS = 0x28,
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// Class 2 commands
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SASI_CMD_EXTENDED_ADDRESS_READ = 0x48,
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SASI_CMD_INVALID_49,
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SASI_CMD_EXTENDED_ADDRESS_WRITE,
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SASI_CMD_WRITE_AND_VERIFY = 0x54,
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SASI_CMD_VERIFY,
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SASI_CMD_INVALID_56,
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SASI_CMD_SEARCH_DATA_HIGH,
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SASI_CMD_SEARCH_DATA_EQUAL,
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SASI_CMD_SEARCH_DATA_LOW,
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// controller-specific commands
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SASI_CMD_SPECIFY = 0xc2
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};
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class x68k_hdc_image_device : public device_t,
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public device_image_interface
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{
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public:
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// construction/destruction
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x68k_hdc_image_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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// image-level overrides
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virtual iodevice_t image_type() const { return IO_HARDDISK; }
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virtual bool is_readable() const { return 1; }
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virtual bool is_writeable() const { return 1; }
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virtual bool is_creatable() const { return 1; }
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virtual bool must_be_loaded() const { return 0; }
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virtual bool is_reset_on_load() const { return 0; }
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virtual const char *image_interface() const { return NULL; }
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virtual const char *file_extensions() const { return "hdf"; }
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virtual const option_guide *create_option_guide() const { return NULL; }
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virtual bool call_create(int format_type, option_resolution *format_options);
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DECLARE_WRITE16_MEMBER( hdc_w );
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DECLARE_READ16_MEMBER( hdc_r );
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protected:
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// device-level overrides
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virtual void device_config_complete();
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virtual void device_start();
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virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
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private:
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int m_phase;
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unsigned char m_status_port; // read at 0xe96003
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unsigned char m_status; // status phase output
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//unsigned char m_message;
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unsigned char m_command[10];
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unsigned char m_sense[4];
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int m_command_byte_count;
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int m_command_byte_total;
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int m_current_command;
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int m_transfer_byte_count;
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int m_transfer_byte_total;
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int m_msg; // MSG
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int m_cd; // C/D (Command/Data)
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int m_bsy; // BSY
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int m_io; // I/O
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int m_req; // REQ
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};
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// device type definition
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extern const device_type X68KHDC;
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#define MCFG_X68KHDC_ADD(_tag) \
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MCFG_DEVICE_ADD(_tag, X68KHDC, 0)
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