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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
#ifndef MAME_BUS_NES_MMC1_H
#define MAME_BUS_NES_MMC1_H
#pragma once
#include "nxrom.h"
// ======================> nes_sxrom_device
class nes_sxrom_device : public nes_nrom_device
{
public:
// construction/destruction
nes_sxrom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
virtual uint8_t read_m(offs_t offset) override;
virtual void write_m(offs_t offset, uint8_t data) override;
virtual void write_h(offs_t offset, uint8_t data) override;
virtual void pcb_reset() override;
protected:
nes_sxrom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
// device-level overrides
virtual void device_start() override;
TIMER_CALLBACK_MEMBER(resync_callback);
virtual void update_regs(int reg); // this is needed to simplify NES-EVENT pcb implementation, which handle differently some regs!
void set_prg(int prg_base, int prg_mask);
void set_chr(int chr_base, int chr_mask);
virtual void set_prg();
// virtual void set_prg() { set_prg(0x00, 0x0f); }
virtual void set_chr() { set_chr(0x00, 0x1f); }
uint8_t m_reg[4];
int m_reg_write_enable;
int m_latch;
int m_count;
};
// ======================> nes_sorom_device
class nes_sorom_device : public nes_sxrom_device
{
public:
// construction/destruction
nes_sorom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
virtual uint8_t read_m(offs_t offset) override;
virtual void write_m(offs_t offset, uint8_t data) override;
};
// ======================> nes_szrom_device
class nes_szrom_device : public nes_sxrom_device
{
public:
// construction/destruction
nes_szrom_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
virtual u8 read_m(offs_t offset) override;
virtual void write_m(offs_t offset, u8 data) override;
};
// device type definition
DECLARE_DEVICE_TYPE(NES_SXROM, nes_sxrom_device)
DECLARE_DEVICE_TYPE(NES_SOROM, nes_sorom_device)
DECLARE_DEVICE_TYPE(NES_SZROM, nes_szrom_device)
#endif // MAME_BUS_NES_MMC1_H
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