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// license:BSD-3-Clause
// copyright-holders:smf
/***************************************************************************
ATMEL AT28C64B
64K ( 8K x 8 ) Parallel EEPROM
***************************************************************************/
#ifndef MAME_MACHINE_AT28C64B_H
#define MAME_MACHINE_AT28C64B_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> at28c64b_device
class at28c64b_device :
public device_t,
public device_memory_interface,
public device_nvram_interface
{
public:
// construction/destruction
at28c64b_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
void write(offs_t offset, u8 data);
u8 read(offs_t offset);
protected:
// device-level overrides
virtual void device_start() override ATTR_COLD;
// device_memory_interface overrides
virtual space_config_vector memory_space_config() const override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual bool nvram_read(util::read_stream &file) override;
virtual bool nvram_write(util::write_stream &file) override;
private:
// internal state
enum
{
STATE_IDLE,
STATE_ID_1,
STATE_ID_2,
STATE_SECTOR_WRITE,
STATE_WRITE_PROTECT
};
address_space_config m_space_config;
emu_timer *m_write_timer;
int m_a9_12v;
int m_oe_12v;
int m_last_write;
int m_state;
int m_bytes_in_sector;
optional_region_ptr<uint8_t> m_default_data;
// I/O operations
void set_a9_12v(int state);
void set_oe_12v(int state);
TIMER_CALLBACK_MEMBER( write_complete );
void at28c64b_map8(address_map &map) ATTR_COLD;
};
// device type definition
DECLARE_DEVICE_TYPE(AT28C64B, at28c64b_device)
#endif // MAME_MACHINE_AT28C64B_H
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