// license:BSD-3-Clause // copyright-holders:David Haywood /* Data East encrypted CPU 222, aka C10707? also sometimes implemented as basic logic outside the CPU on early revs and bootlegs */ #include "emu.h" #include "deco222.h" DEFINE_DEVICE_TYPE(DECO_222, deco_222_device, "deco222", "DECO 222") DEFINE_DEVICE_TYPE(DECO_C10707, deco_c10707_device, "decoc10707", "DECO C10707") deco_222_device::deco_222_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : m6502_device(mconfig, DECO_222, tag, owner, clock) { } void deco_222_device::device_start() { mintf = std::make_unique(); init(); } void deco_222_device::device_reset() { m6502_device::device_reset(); downcast(*mintf).had_written = false; } uint8_t deco_222_device::mi_decrypt::read_sync(uint16_t adr) { return bitswap<8>(cache->read_byte(adr) ,7,5,6,4,3,2,1,0); } std::unique_ptr deco_222_device::create_disassembler() { return std::make_unique(); } u32 deco_222_device::disassembler::interface_flags() const { return SPLIT_DECRYPTION; } u8 deco_222_device::disassembler::decrypt8(u8 value, offs_t pc, bool opcode) const { return opcode ? bitswap<8>(value,7,5,6,4,3,2,1,0) : value; } deco_c10707_device::deco_c10707_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : m6502_device(mconfig, DECO_C10707, tag, owner, clock) { } void deco_c10707_device::device_start() { mintf = std::make_unique(); init(); } void deco_c10707_device::device_reset() { m6502_device::device_reset(); downcast(*mintf).had_written = false; } uint8_t deco_c10707_device::mi_decrypt::read_sync(uint16_t adr) { return bitswap<8>(cache->read_byte(adr) ,7,5,6,4,3,2,1,0); } std::unique_ptr deco_c10707_device::create_disassembler() { return std::make_unique(); } u32 deco_c10707_device::disassembler::interface_flags() const { return SPLIT_DECRYPTION; } u8 deco_c10707_device::disassembler::decrypt8(u8 value, offs_t pc, bool opcode) const { return opcode ? bitswap<8>(value,7,5,6,4,3,2,1,0) : value; }