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// license:BSD-3-Clause
// copyright-holders:David Shah
/***************************************************************************
m6502_vtscr.h
6502 with VRT VTxx instruction scrambling
***************************************************************************/
#ifndef MAME_CPU_M6502_VTSCR_H
#define MAME_CPU_M6502_VTSCR_H
#pragma once
#include "cpu/m6502/m6502.h"
#include "cpu/m6502/m6502d.h"
class m6502_vtscr : public m6502_device {
public:
m6502_vtscr(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
void set_next_scramble(bool scr);
void set_scramble(bool scr);
protected:
class mi_decrypt : public mi_default {
public:
bool m_scramble_en = false;
bool m_next_scramble = false;
virtual ~mi_decrypt() {}
virtual uint8_t read_sync(uint16_t adr) override;
uint8_t descramble(uint8_t op);
bool toggle_scramble(uint8_t op);
};
class disassembler : public m6502_disassembler {
public:
mi_decrypt *mintf;
disassembler(mi_decrypt *m);
virtual ~disassembler() = default;
virtual u32 interface_flags() const override;
virtual u8 decrypt8(u8 value, offs_t pc, bool opcode) const override;
};
virtual void device_reset() override;
virtual void device_start() override;
virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
};
DECLARE_DEVICE_TYPE(M6502_VTSCR, m6502_vtscr)
#endif // MAME_CPU_M6502_VTSCR_H
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