// 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 create_disassembler() override; }; DECLARE_DEVICE_TYPE(M6502_VTSCR, m6502_vtscr) #endif // MAME_CPU_M6502_VTSCR_H