// license:BSD-3-Clause // copyright-holders:Olivier Galibert /*************************************************************************** The Konami_1 CPU is a 6809 with opcodes scrambled. ***************************************************************************/ #include "emu.h" #include "konami1.h" DEFINE_DEVICE_TYPE(KONAMI1, konami1_device, "konami1", "KONAMI-1") konami1_device::konami1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : m6809_base_device(mconfig, tag, owner, clock, KONAMI1, 1) { m_boundary = 0x0000; } void konami1_device::device_start() { m_mintf = std::make_unique(m_boundary); m6809_base_device::device_start(); } u32 konami1_device::disassembler::interface_flags() const { return SPLIT_DECRYPTION; } u8 konami1_device::disassembler::decrypt8(u8 value, offs_t pc, bool opcode) const { if (!opcode || pc < m_boundary) return value; switch (pc & 0xa) { default: case 0x0: return value ^ 0x22; case 0x2: return value ^ 0x82; case 0x8: return value ^ 0x28; case 0xa: return value ^ 0x88; } return value; } std::unique_ptr konami1_device::create_disassembler() { return std::make_unique(m_boundary); } void konami1_device::set_encryption_boundary(uint16_t adr) { m_boundary = adr; if(m_mintf) downcast(m_mintf.get())->m_boundary = adr; } konami1_device::mi_konami1::mi_konami1(uint16_t adr) { m_boundary = adr; } uint8_t konami1_device::mi_konami1::read_opcode(uint16_t adr) { uint8_t val = csprogram.read_byte(adr); if(adr < m_boundary) return val; switch(adr & 0xa) { default: case 0x0: return val ^ 0x22; case 0x2: return val ^ 0x82; case 0x8: return val ^ 0x28; case 0xa: return val ^ 0x88; } }