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// license:BSD-3-Clause
// copyright-holders:hap
/***************************************************************************
Alpha Denshi ALPHA-8201 family protection emulation
***************************************************************************/
#ifndef MAME_MACHINE_ALPHA8201_H
#define MAME_MACHINE_ALPHA8201_H
#include "cpu/hmcs40/hmcs40.h"
class alpha_8201_device : public device_t
{
public:
alpha_8201_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
~alpha_8201_device() {}
// external I/O
DECLARE_WRITE_LINE_MEMBER(bus_dir_w);
DECLARE_WRITE_LINE_MEMBER(mcu_start_w);
u8 ext_ram_r(offs_t offset);
void ext_ram_w(offs_t offset, u8 data);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_add_mconfig(machine_config &config) override;
private:
// devices/pointers
required_device<hmcs40_cpu_device> m_mcu;
// internal state
int m_bus = 0; // shared RAM bus direction
u16 m_mcu_address = 0; // MCU side RAM address
u16 m_mcu_d = 0; // MCU D output data
u8 m_mcu_r[4]{}; // MCU R0-R3 output data
std::unique_ptr<u8[]> m_shared_ram; // 1KB RAM
void mcu_update_address();
void mcu_writeram();
u8 mcu_data_r(offs_t offset);
void mcu_data_w(offs_t offset, u8 data);
void mcu_d_w(u16 data);
};
DECLARE_DEVICE_TYPE(ALPHA_8201, alpha_8201_device)
#endif // MAME_MACHINE_ALPHA8201_H
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