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// license: GPL-2.0+
// copyright-holders: Dirk Best
/***************************************************************************
Silicon Disc
A 256k RAM drive that gets accessed as drive 3.
***************************************************************************/
#ifndef MAME_BUS_EINSTEIN_SILICON_DISC_H
#define MAME_BUS_EINSTEIN_SILICON_DISC_H
#pragma once
#include "pipe.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> einstein_silicon_disc_device
class einstein_silicon_disc_device : public device_t, public device_tatung_pipe_interface
{
public:
// construction/destruction
einstein_silicon_disc_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
protected:
virtual const tiny_rom_entry *device_rom_region() const override;
virtual void device_start() override;
virtual void device_reset() override;
private:
void map(address_map &map);
required_memory_region m_rom;
required_memory_region m_bios;
std::unique_ptr<uint8_t[]> m_ram;
uint16_t m_sector;
uint8_t ram_r(offs_t offset);
void ram_w(offs_t offset, uint8_t data);
void sector_low_w(uint8_t data);
void sector_high_w(uint8_t data);
};
// device type definition
DECLARE_DEVICE_TYPE(EINSTEIN_SILICON_DISC, einstein_silicon_disc_device)
#endif // MAME_BUS_EINSTEIN_SILICON_DISC_H
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