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Diffstat (limited to 'src/mame/machine/m6502_swap_op_d2_d7.h')
-rw-r--r-- | src/mame/machine/m6502_swap_op_d2_d7.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/mame/machine/m6502_swap_op_d2_d7.h b/src/mame/machine/m6502_swap_op_d2_d7.h new file mode 100644 index 00000000000..7521ae8fff7 --- /dev/null +++ b/src/mame/machine/m6502_swap_op_d2_d7.h @@ -0,0 +1,53 @@ +// license:BSD-3-Clause +// copyright-holders:David Shah, David Haywood +/*************************************************************************** + + m6502_swap_op_d2_d7.h + + 6502 with instruction scrambling + +***************************************************************************/ + +#ifndef MAME_M6502_SWAP_OP_D2_D7_H +#define MAME_M6502_SWAP_OP_D2_D7_H + +#pragma once + +#include "cpu/m6502/m6502.h" +#include "cpu/m6502/m6502d.h" + +class m6502_swap_op_d2_d7 : public m6502_device { +public: + m6502_swap_op_d2_d7(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); + +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); + }; + + 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_SWAP_OP_D2_D7, m6502_swap_op_d2_d7) + +#endif // MAME_M6502_SWAP_OP_D2_D7_H |