def test_write_AbsoluteX():
address_mode = AbsoluteX
cpu = CPU()
memory = Memory(rom=[0x30, 0x01, 0xFF, 0x02, 0x0A, 0x05], ram=list(map(lambda x: x % 256, range(Memory.ram_size()))))
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start)
cpu.x = 0x25
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 20)
assert address == 0x0155
assert memory.ram[address] == 20
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 0x30
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 100)
assert address == 0x032F
assert memory.ram[address] == 100
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 0x20
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 67)
assert address == 0x052A
assert memory.ram[address] == 67
def test_read_AbsoluteX():
address_mode = AbsoluteX
cpu = CPU()
memory = Memory(rom=[0x32, 0x02, 0x7F, 0x01, 0x00, 0x20], ram=list(map(lambda x: x % 256, range(Memory.ram_size()))))
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start)
cpu.x = 0x0A
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 0x023C
assert value == (0x023C % 256)
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 0xA1
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 0x0220
assert value == (0x0220 % 256)
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 0x07
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 0x2007
def test_TAX():
cpu = CPU()
memory = Memory()
cpu.x = 1
cpu.a = 2
TAX = OpCodes.all[170]
TAX.exec(cpu, memory)
assert cpu.x == 2
assert cpu.zero == False
assert cpu.negative == False
cpu.a = 0
cpu.x = 1
cpu.inc_cycle_by(-cpu.cycle)
TAX.exec(cpu, memory)
assert cpu.cycle == (TAX.cycles - 1)
assert cpu.x == 0
assert cpu.zero == True
assert cpu.negative == False
cpu.a = 0b10000001
cpu.x = 1
TAX.exec(cpu, memory)
assert cpu.x == 0b10000001
assert cpu.zero == False
print(cpu.negative)
assert cpu.negative == True
def test_TXA():
cpu = CPU()
memory = Memory()
cpu.a = 1
cpu.x = 2
TXA = OpCodes.all[138]
TXA.exec(cpu, memory)
assert cpu.a == 2
assert cpu.zero == False
assert cpu.negative == False
cpu.x = 0
cpu.a = 1
TXA.exec(cpu, memory)
assert cpu.a == 0
assert cpu.zero == True
assert cpu.negative == False
cpu.x = 0b10000001
cpu.a = 1
cpu.inc_cycle_by(-cpu.cycle)
TXA.exec(cpu, memory)
assert cpu.cycle == (TXA.cycles - 1)
assert cpu.a == 0b10000001
assert cpu.zero == False
print(cpu.negative)
assert cpu.negative == True
def test_write_ZeroPageX():
address_mode = ZeroPageX
cpu = CPU()
memory = Memory(rom=list(range(256)))
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start)
cpu.x = 5
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 6)
assert address == 5
assert memory.ram[address] == 6
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 20)
cpu.x = 15
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 105)
assert address == 35
assert memory.ram[address] == 105
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 100)
cpu.x = 155
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 143)
assert address == 255
assert memory.ram[address] == 143
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 255)
cpu.x = 0
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 255)
assert address == 255
assert memory.ram[address] == 255
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 255)
cpu.x = 75
address = address_mode.fetch_address(cpu, memory)
address_mode.write_to(cpu, memory, address, 255)
assert address == 74
assert memory.ram[address] == 255
assert cpu.cycle == 3
def test_read_ZeroPageX():
address_mode = ZeroPageX
cpu = CPU()
memory = Memory(rom=list(range(256)), ram=list(reversed(range(256))))
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start)
cpu.x = 1
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 1
assert value == 254
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 20)
cpu.x = 10
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 30
assert value == 225
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 100)
cpu.x = 5
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 105
assert value == 150
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 255)
cpu.x = 0
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 255
assert value == 0
assert cpu.cycle == 3
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start + 255)
cpu.x = 5
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == 4
assert value == 251
assert cpu.cycle == 3
def test_DEX_within_bounds():
instruction = OpCodes.all[0xCA]
cpu = CPU()
memory = Memory()
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 7
instruction.exec(cpu, memory)
assert cpu.cycle == (instruction.cycles - 1)
assert cpu.x == 6
assert cpu.zero == False
assert cpu.negative == False
def test_DEX_zero():
instruction = OpCodes.all[0xCA]
cpu = CPU()
memory = Memory()
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 1
instruction.exec(cpu, memory)
assert cpu.cycle == (instruction.cycles - 1)
assert cpu.x == 0
assert cpu.zero == True
assert cpu.negative == False
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 257
instruction.exec(cpu, memory)
assert cpu.cycle == (instruction.cycles - 1)
assert cpu.x == 0
assert cpu.zero == True
assert cpu.negative == False
def test_read_IndirectX():
address_mode = IndirectX
cpu = CPU()
memory = Memory(rom=[0x00, 0x02, 0x7F, 0x01, 0xFF, 0x07],
ram=list(map(lambda x: x % 256, range(Memory.ram_size()))))
cpu.inc_cycle_by(-cpu.cycle)
cpu.inc_pc_by(-cpu.pc + MemoryPositions.PRG_ROM_START.start)
cpu.x = 4
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == (((0x0504 + 1) % 256) << 8 | (0x0504 % 256))
assert value == address % 256
assert cpu.cycle == 5
cpu.inc_cycle_by(-cpu.cycle)
cpu.x = 0xFF
address = address_mode.fetch_address(cpu, memory)
value = address_mode.read_from(cpu, memory, address)
assert address == (((0x0201 + 1) % 256) << 8 | (0x0201 % 256))
assert value == address % 256
assert cpu.cycle == 5
