Exemplo n.º 1
0
class TestJumpCallOperations(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_JMP(self):
        self.cpu.JMP(0x1000)
        self.assertEqual(self.cpu.program_counter, 0x1000)

    def test_JSR(self):
        self.cpu.program_counter = 0x1000
        self.cpu.JSR(0x2000)
        self.assertEqual(self.cpu.program_counter, 0x2000)
        self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1), 0xFF)
        self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x0F)

    def test_RTS(self):
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
        self.cpu.stack_pointer = 0xFD
        self.cpu.RTS()
        self.assertEqual(self.cpu.program_counter, 0x1234)

    def test_JSR_and_RTS(self):
        self.cpu.program_counter = 0x1000
        self.cpu.JSR(0x2000)
        self.assertEqual(self.cpu.program_counter, 0x2000)
        self.cpu.RTS()
        self.assertEqual(self.cpu.program_counter, 0x1000)  # @@@
Exemplo n.º 2
0
class TestJumpCallOperations(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_JMP(self):
        self.cpu.JMP(0x1000)
        self.assertEqual(self.cpu.program_counter, 0x1000)

    def test_JSR(self):
        self.cpu.program_counter = 0x1000
        self.cpu.JSR(0x2000)
        self.assertEqual(self.cpu.program_counter, 0x2000)
        self.assertEqual(
            self.memory.read_byte(
                None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1), 0xFF)
        self.assertEqual(
            self.memory.read_byte(
                None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x0F)

    def test_RTS(self):
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
        self.cpu.stack_pointer = 0xFD
        self.cpu.RTS()
        self.assertEqual(self.cpu.program_counter, 0x1234)

    def test_JSR_and_RTS(self):
        self.cpu.program_counter = 0x1000
        self.cpu.JSR(0x2000)
        self.assertEqual(self.cpu.program_counter, 0x2000)
        self.cpu.RTS()
        self.assertEqual(self.cpu.program_counter, 0x1000)  # @@@
Exemplo n.º 3
0
class TestMemory(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)

    def test_load(self):
        self.memory.load(0x1000, [0x01, 0x02, 0x03])
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
        self.assertEqual(self.memory.read_byte(None, 0x1001), 0x02)
        self.assertEqual(self.memory.read_byte(None, 0x1002), 0x03)

    def test_write(self):
        self.memory.write_byte(None, 0x1000, 0x11)
        self.memory.write_byte(None, 0x1001, 0x12)
        self.memory.write_byte(None, 0x1002, 0x13)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x11)
        self.assertEqual(self.memory.read_byte(None, 0x1001), 0x12)
        self.assertEqual(self.memory.read_byte(None, 0x1002), 0x13)
Exemplo n.º 4
0
class TestSystemFunctionOperations(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_BRK(self):
        self.cpu.program_counter = 0x1000
        self.memory.rom.load(0xFFFE, [0x00, 0x20])
        status = self.cpu.status_as_byte()
        self.cpu.BRK()
        self.assertEqual(self.cpu.program_counter, 0x2000)
        self.assertEqual(self.cpu.break_flag, 1)
        self.assertEqual(
            self.memory.read_byte(
                None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1),
            status)
        self.assertEqual(
            self.memory.read_byte(
                None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x01)
        self.assertEqual(
            self.memory.read_byte(
                None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 3), 0x10)

    def test_RTI(self):
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFD, 0x20)
        self.cpu.stack_pointer = 0xFC
        self.cpu.RTI()
        self.assertEqual(self.cpu.program_counter, 0x1233)
        self.assertEqual(self.cpu.status_as_byte(), 0x20)

    def test_NOP(self):
        self.cpu.NOP()
Exemplo n.º 5
0
class TestMemory(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)

    def test_load(self):
        self.memory.load(0x1000, [0x01, 0x02, 0x03])
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
        self.assertEqual(self.memory.read_byte(None, 0x1001), 0x02)
        self.assertEqual(self.memory.read_byte(None, 0x1002), 0x03)

    def test_write(self):
        self.memory.write_byte(None, 0x1000, 0x11)
        self.memory.write_byte(None, 0x1001, 0x12)
        self.memory.write_byte(None, 0x1002, 0x13)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x11)
        self.assertEqual(self.memory.read_byte(None, 0x1001), 0x12)
        self.assertEqual(self.memory.read_byte(None, 0x1002), 0x13)
Exemplo n.º 6
0
class TestSystemFunctionOperations(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_BRK(self):
        self.cpu.program_counter = 0x1000
        self.memory.rom.load(0xFFFE, [0x00, 0x20])
        status = self.cpu.status_as_byte()
        self.cpu.BRK()
        self.assertEqual(self.cpu.program_counter, 0x2000)
        self.assertEqual(self.cpu.break_flag, 1)
        self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1), status)
        self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x01)
        self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 3), 0x10)

    def test_RTI(self):
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
        self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFD, 0x20)
        self.cpu.stack_pointer = 0xFC
        self.cpu.RTI()
        self.assertEqual(self.cpu.program_counter, 0x1233)
        self.assertEqual(self.cpu.status_as_byte(), 0x20)

    def test_NOP(self):
        self.cpu.NOP()
Exemplo n.º 7
0
class TestIncrementDecrementOperations(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_INC(self):
        self.memory.write_byte(None, 0x1000, 0x00)
        self.cpu.INC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.memory.write_byte(None, 0x1000, 0x7F)
        self.cpu.INC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.INC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)

    def test_INX(self):
        self.cpu.x_index = 0x00
        self.cpu.INX()
        self.assertEqual(self.cpu.x_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.x_index = 0x7F
        self.cpu.INX()
        self.assertEqual(self.cpu.x_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.x_index = 0xFF
        self.cpu.INX()
        self.assertEqual(self.cpu.x_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)

    def test_INY(self):
        self.cpu.y_index = 0x00
        self.cpu.INY()
        self.assertEqual(self.cpu.y_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.y_index = 0x7F
        self.cpu.INY()
        self.assertEqual(self.cpu.y_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.y_index = 0xFF
        self.cpu.INY()
        self.assertEqual(self.cpu.y_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)

    def test_DEC(self):
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.DEC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.DEC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.memory.write_byte(None, 0x1000, 0x00)
        self.cpu.DEC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_DEX(self):
        self.cpu.x_index = 0x01
        self.cpu.DEX()
        self.assertEqual(self.cpu.x_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.x_index = 0x80
        self.cpu.DEX()
        self.assertEqual(self.cpu.x_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.x_index = 0x00
        self.cpu.DEX()
        self.assertEqual(self.cpu.x_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_DEY(self):
        self.cpu.y_index = 0x01
        self.cpu.DEY()
        self.assertEqual(self.cpu.y_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.y_index = 0x80
        self.cpu.DEY()
        self.assertEqual(self.cpu.y_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.y_index = 0x00
        self.cpu.DEY()
        self.assertEqual(self.cpu.y_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
Exemplo n.º 8
0
class TestArithmeticOperations(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_ADC_without_BCD(self):

        ## test cases from http://www.6502.org/tutorials/vflag.html

        # 1 + 1 = 2  (C = 0; V = 0)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x01
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x02)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 0)

        # 1 + -1 = 0  (C = 1; V = 0)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x01
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 0)

        # 127 + 1 = 128  (C = 0; V = 1)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x7F
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x80)  # @@@
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # -128 + -1 = -129  (C = 1; V = 1)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x80
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x7F)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # 63 + 64 + 1 = 128  (C = 0; V = 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x3F
        self.memory.write_byte(None, 0x1000, 0x40)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 1)

    def test_SBC_without_BCD(self):
        self.cpu.accumulator = 0x02
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 0)

        self.cpu.accumulator = 0x01
        self.memory.write_byte(None, 0x1000, 0x02)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xFF)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 0)  # @@@

        ## test cases from http://www.6502.org/tutorials/vflag.html

        # 0 - 1 = -1  (V = 0)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x00
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xFF)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 0)  # @@@

        # -128 - 1 = -129  (V = 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x80
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x7F)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # 127 - -1 = 128  (V = 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x7F
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # -64 -64 -1 = -129  (V = 1)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0xC0
        self.memory.write_byte(None, 0x1000, 0x40)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x7F)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 1)  # @@@

    ## @@@ BCD versions still to do

    def test_CMP(self):
        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0x09)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0B)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.accumulator = 0xA0
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0xA0)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

    def test_CPX(self):
        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x09)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0B)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.x_index = 0xA0
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0xA0)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

    def test_CPY(self):
        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x09)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0B)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.y_index = 0xA0
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0xA0)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)
Exemplo n.º 9
0
 def setUp(self):
     self.memory = Memory(use_bus=False)
     self.cpu = CPU(self.memory)
     self.memory.load(0x1000, [0x00, 0x01, 0x7F, 0x80, 0xFF])
Exemplo n.º 10
0
class TestLoadStoreOperations(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)
        self.memory.load(0x1000, [0x00, 0x01, 0x7F, 0x80, 0xFF])

    def test_LDA(self):
        self.cpu.LDA(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.LDA(0x1001)
        self.assertEqual(self.cpu.accumulator, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDA(0x1002)
        self.assertEqual(self.cpu.accumulator, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDA(0x1003)
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDA(0x1004)
        self.assertEqual(self.cpu.accumulator, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_LDX(self):
        self.cpu.LDX(0x1000)
        self.assertEqual(self.cpu.x_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.LDX(0x1001)
        self.assertEqual(self.cpu.x_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDX(0x1002)
        self.assertEqual(self.cpu.x_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDX(0x1003)
        self.assertEqual(self.cpu.x_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDX(0x1004)
        self.assertEqual(self.cpu.x_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_LDY(self):
        self.cpu.LDY(0x1000)
        self.assertEqual(self.cpu.y_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.LDY(0x1001)
        self.assertEqual(self.cpu.y_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDY(0x1002)
        self.assertEqual(self.cpu.y_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDY(0x1003)
        self.assertEqual(self.cpu.y_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDY(0x1004)
        self.assertEqual(self.cpu.y_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_STA(self):
        self.cpu.accumulator = 0x37
        self.cpu.STA(0x2000)
        self.assertEqual(self.memory.read_byte(None, 0x2000), 0x37)

    def test_STX(self):
        self.cpu.x_index = 0x38
        self.cpu.STX(0x2000)
        self.assertEqual(self.memory.read_byte(None, 0x2000), 0x38)

    def test_STY(self):
        self.cpu.y_index = 0x39
        self.cpu.STY(0x2000)
        self.assertEqual(self.memory.read_byte(None, 0x2000), 0x39)
Exemplo n.º 11
0
 def setUp(self):
     self.memory = Memory(use_bus=False)
     self.cpu = CPU(self.memory)
     self.memory.load(0x1000, [0x00, 0x01, 0x7F, 0x80, 0xFF])
Exemplo n.º 12
0
class Test6502Bugs(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_zero_page_x(self):
        self.cpu.x_index = 0x01
        self.memory.load(0x1000, [0x00, 0x7F, 0xFF])
        self.cpu.program_counter = 0x1000
        self.assertEqual(self.cpu.zero_page_x_mode(), 0x01)
        self.assertEqual(self.cpu.zero_page_x_mode(), 0x80)
        self.assertEqual(self.cpu.zero_page_x_mode(), 0x00)

    def test_indirect(self):
        self.memory.load(0x20, [0x00, 0x20])
        self.memory.load(0x00, [0x12])
        self.memory.load(0xFF, [0x34])
        self.memory.load(0x100, [0x56])
        self.memory.load(0x1000, [0x20, 0x20, 0xFF, 0xFF, 0x00, 0x45, 0x23])
        self.memory.load(0x2000, [0x05])
        self.memory.load(0x1234, [0x05])
        self.memory.load(0x2345, [0x00, 0xF0])

        self.cpu.program_counter = 0x1000

        self.cpu.x_index = 0x00
        self.cpu.LDA(self.cpu.indirect_x_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.y_index = 0x00
        self.cpu.LDA(self.cpu.indirect_y_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.y_index = 0x00
        self.cpu.LDA(self.cpu.indirect_y_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.x_index = 0x00
        self.cpu.LDA(self.cpu.indirect_x_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.x_index = 0xFF
        self.cpu.LDA(self.cpu.indirect_x_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.assertEqual(self.cpu.indirect_mode(), 0xF000)
Exemplo n.º 13
0
class TestLogicalOperations(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_AND(self):
        self.memory.write_byte(None, 0x1000, 0x37)
        self.cpu.accumulator = 0x34
        self.cpu.AND(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x34)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.cpu.accumulator = 0x40
        self.cpu.AND(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)

    def test_EOR(self):
        self.memory.write_byte(None, 0x1000, 0x37)
        self.cpu.accumulator = 0x34
        self.cpu.EOR(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x03)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.cpu.accumulator = 0x90
        self.cpu.EOR(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xA7)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.cpu.accumulator = 0x37
        self.cpu.EOR(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)

    def test_ORA(self):
        self.memory.write_byte(None, 0x1000, 0x37)
        self.cpu.accumulator = 0x34
        self.cpu.ORA(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x37)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.cpu.accumulator = 0x90
        self.cpu.ORA(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xB7)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.cpu.accumulator = 0x00
        self.cpu.ORA(0x1001)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)

    def test_BIT(self):
        self.memory.write_byte(None, 0x1000, 0x00)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x40)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0xC0)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0xC0)
        self.cpu.accumulator = 0xC0
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
Exemplo n.º 14
0
class TestArithmeticOperations(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_ADC_without_BCD(self):

        ## test cases from http://www.6502.org/tutorials/vflag.html

        # 1 + 1 = 2  (C = 0; V = 0)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x01
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x02)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 0)

        # 1 + -1 = 0  (C = 1; V = 0)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x01
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 0)

        # 127 + 1 = 128  (C = 0; V = 1)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x7F
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x80)  # @@@
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # -128 + -1 = -129  (C = 1; V = 1)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x80
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x7F)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # 63 + 64 + 1 = 128  (C = 0; V = 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x3F
        self.memory.write_byte(None, 0x1000, 0x40)
        self.cpu.ADC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 1)

    def test_SBC_without_BCD(self):
        self.cpu.accumulator = 0x02
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 0)

        self.cpu.accumulator = 0x01
        self.memory.write_byte(None, 0x1000, 0x02)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xFF)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 0)  # @@@

        ## test cases from http://www.6502.org/tutorials/vflag.html

        # 0 - 1 = -1  (V = 0)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x00
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xFF)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 0)  # @@@

        # -128 - 1 = -129  (V = 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x80
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x7F)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # 127 - -1 = 128  (V = 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x7F
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.assertEqual(self.cpu.overflow_flag, 1)

        # -64 -64 -1 = -129  (V = 1)
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0xC0
        self.memory.write_byte(None, 0x1000, 0x40)
        self.cpu.SBC(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x7F)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.assertEqual(self.cpu.overflow_flag, 1)  # @@@

    ## @@@ BCD versions still to do

    def test_CMP(self):
        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0x09)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0B)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.accumulator = 0xA0
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.accumulator = 0x0A
        self.memory.write_byte(None, 0x1000, 0xA0)
        self.cpu.CMP(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

    def test_CPX(self):
        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x09)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0B)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.x_index = 0xA0
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.x_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0xA0)
        self.cpu.CPX(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

    def test_CPY(self):
        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x09)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0B)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.y_index = 0xA0
        self.memory.write_byte(None, 0x1000, 0x0A)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 1)

        self.cpu.y_index = 0x0A
        self.memory.write_byte(None, 0x1000, 0xA0)
        self.cpu.CPY(0x1000)
        self.assertEqual(self.cpu.sign_flag, 0)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)
Exemplo n.º 15
0
 def setUp(self):
     self.memory = Memory(use_bus=False)
Exemplo n.º 16
0
 def setUp(self):
     self.memory = Memory(use_bus=False)
Exemplo n.º 17
0
class TestShiftOperations(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_ASL(self):
        self.cpu.accumulator = 0x01
        self.cpu.ASL()
        self.assertEqual(self.cpu.accumulator, 0x02)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.memory.write_byte(None, 0x1000, 0x02)
        self.cpu.ASL(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x04)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.cpu.accumulator = 0x80
        self.cpu.ASL()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

    def test_LSR(self):
        self.cpu.accumulator = 0x01
        self.cpu.LSR()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.LSR(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.accumulator = 0x80
        self.cpu.LSR()
        self.assertEqual(self.cpu.accumulator, 0x40)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

    def test_ROL(self):
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x80
        self.cpu.ROL()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x80
        self.cpu.ROL()
        self.assertEqual(self.cpu.accumulator, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 0
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.ROL(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.ROL(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)

    def test_ROR(self):
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x01
        self.cpu.ROR()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x01
        self.cpu.ROR()
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 0
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ROR(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ROR(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
Exemplo n.º 18
0
class TestIncrementDecrementOperations(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_INC(self):
        self.memory.write_byte(None, 0x1000, 0x00)
        self.cpu.INC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.memory.write_byte(None, 0x1000, 0x7F)
        self.cpu.INC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.memory.write_byte(None, 0x1000, 0xFF)
        self.cpu.INC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)

    def test_INX(self):
        self.cpu.x_index = 0x00
        self.cpu.INX()
        self.assertEqual(self.cpu.x_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.x_index = 0x7F
        self.cpu.INX()
        self.assertEqual(self.cpu.x_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.x_index = 0xFF
        self.cpu.INX()
        self.assertEqual(self.cpu.x_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)

    def test_INY(self):
        self.cpu.y_index = 0x00
        self.cpu.INY()
        self.assertEqual(self.cpu.y_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.y_index = 0x7F
        self.cpu.INY()
        self.assertEqual(self.cpu.y_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.y_index = 0xFF
        self.cpu.INY()
        self.assertEqual(self.cpu.y_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)

    def test_DEC(self):
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.DEC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.DEC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.memory.write_byte(None, 0x1000, 0x00)
        self.cpu.DEC(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_DEX(self):
        self.cpu.x_index = 0x01
        self.cpu.DEX()
        self.assertEqual(self.cpu.x_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.x_index = 0x80
        self.cpu.DEX()
        self.assertEqual(self.cpu.x_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.x_index = 0x00
        self.cpu.DEX()
        self.assertEqual(self.cpu.x_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_DEY(self):
        self.cpu.y_index = 0x01
        self.cpu.DEY()
        self.assertEqual(self.cpu.y_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.y_index = 0x80
        self.cpu.DEY()
        self.assertEqual(self.cpu.y_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.y_index = 0x00
        self.cpu.DEY()
        self.assertEqual(self.cpu.y_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
Exemplo n.º 19
0
class TestShiftOperations(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_ASL(self):
        self.cpu.accumulator = 0x01
        self.cpu.ASL()
        self.assertEqual(self.cpu.accumulator, 0x02)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.memory.write_byte(None, 0x1000, 0x02)
        self.cpu.ASL(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x04)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)
        self.cpu.accumulator = 0x80
        self.cpu.ASL()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)

    def test_LSR(self):
        self.cpu.accumulator = 0x01
        self.cpu.LSR()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.LSR(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.accumulator = 0x80
        self.cpu.LSR()
        self.assertEqual(self.cpu.accumulator, 0x40)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.carry_flag, 0)

    def test_ROL(self):
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x80
        self.cpu.ROL()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x80
        self.cpu.ROL()
        self.assertEqual(self.cpu.accumulator, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 0
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.ROL(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.ROL(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)

    def test_ROR(self):
        self.cpu.carry_flag = 0
        self.cpu.accumulator = 0x01
        self.cpu.ROR()
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.cpu.accumulator = 0x01
        self.cpu.ROR()
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 0
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ROR(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
        self.cpu.carry_flag = 1
        self.memory.write_byte(None, 0x1000, 0x01)
        self.cpu.ROR(0x1000)
        self.assertEqual(self.memory.read_byte(None, 0x1000), 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)  # @@@
        self.assertEqual(self.cpu.zero_flag, 0)  # @@@
        self.assertEqual(self.cpu.carry_flag, 1)
Exemplo n.º 20
0
class Test6502Bugs(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_zero_page_x(self):
        self.cpu.x_index = 0x01
        self.memory.load(0x1000, [0x00, 0x7F, 0xFF])
        self.cpu.program_counter = 0x1000
        self.assertEqual(self.cpu.zero_page_x_mode(), 0x01)
        self.assertEqual(self.cpu.zero_page_x_mode(), 0x80)
        self.assertEqual(self.cpu.zero_page_x_mode(), 0x00)

    def test_indirect(self):
        self.memory.load(0x20, [0x00, 0x20])
        self.memory.load(0x00, [0x12])
        self.memory.load(0xFF, [0x34])
        self.memory.load(0x100, [0x56])
        self.memory.load(0x1000, [0x20, 0x20, 0xFF, 0xFF, 0x00, 0x45, 0x23])
        self.memory.load(0x2000, [0x05])
        self.memory.load(0x1234, [0x05])
        self.memory.load(0x2345, [0x00, 0xF0])

        self.cpu.program_counter = 0x1000

        self.cpu.x_index = 0x00
        self.cpu.LDA(self.cpu.indirect_x_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.y_index = 0x00
        self.cpu.LDA(self.cpu.indirect_y_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.y_index = 0x00
        self.cpu.LDA(self.cpu.indirect_y_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.x_index = 0x00
        self.cpu.LDA(self.cpu.indirect_x_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.cpu.x_index = 0xFF
        self.cpu.LDA(self.cpu.indirect_x_mode())
        self.assertEqual(self.cpu.accumulator, 0x05)

        self.assertEqual(self.cpu.indirect_mode(), 0xF000)
Exemplo n.º 21
0
 def setUp(self):
     self.memory = Memory(use_bus=False)
     self.cpu = CPU(self.memory)
Exemplo n.º 22
0
class TestLogicalOperations(unittest.TestCase):

    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)

    def test_AND(self):
        self.memory.write_byte(None, 0x1000, 0x37)
        self.cpu.accumulator = 0x34
        self.cpu.AND(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x34)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.cpu.accumulator = 0x40
        self.cpu.AND(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)

    def test_EOR(self):
        self.memory.write_byte(None, 0x1000, 0x37)
        self.cpu.accumulator = 0x34
        self.cpu.EOR(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x03)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.cpu.accumulator = 0x90
        self.cpu.EOR(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xA7)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.cpu.accumulator = 0x37
        self.cpu.EOR(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)

    def test_ORA(self):
        self.memory.write_byte(None, 0x1000, 0x37)
        self.cpu.accumulator = 0x34
        self.cpu.ORA(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x37)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.cpu.accumulator = 0x90
        self.cpu.ORA(0x1000)
        self.assertEqual(self.cpu.accumulator, 0xB7)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.cpu.accumulator = 0x00
        self.cpu.ORA(0x1001)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)

    def test_BIT(self):
        self.memory.write_byte(None, 0x1000, 0x00)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x40)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0x80)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 0)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0xC0)
        self.cpu.accumulator = 0x00
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.memory.write_byte(None, 0x1000, 0xC0)
        self.cpu.accumulator = 0xC0
        self.cpu.BIT(0x1000)
        self.assertEqual(self.cpu.overflow_flag, 1)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
Exemplo n.º 23
0
 def setUp(self):
     self.memory = Memory(use_bus=False)
     self.cpu = CPU(self.memory)
Exemplo n.º 24
0
class TestLoadStoreOperations(unittest.TestCase):
    def setUp(self):
        self.memory = Memory(use_bus=False)
        self.cpu = CPU(self.memory)
        self.memory.load(0x1000, [0x00, 0x01, 0x7F, 0x80, 0xFF])

    def test_LDA(self):
        self.cpu.LDA(0x1000)
        self.assertEqual(self.cpu.accumulator, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.LDA(0x1001)
        self.assertEqual(self.cpu.accumulator, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDA(0x1002)
        self.assertEqual(self.cpu.accumulator, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDA(0x1003)
        self.assertEqual(self.cpu.accumulator, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDA(0x1004)
        self.assertEqual(self.cpu.accumulator, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_LDX(self):
        self.cpu.LDX(0x1000)
        self.assertEqual(self.cpu.x_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.LDX(0x1001)
        self.assertEqual(self.cpu.x_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDX(0x1002)
        self.assertEqual(self.cpu.x_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDX(0x1003)
        self.assertEqual(self.cpu.x_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDX(0x1004)
        self.assertEqual(self.cpu.x_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_LDY(self):
        self.cpu.LDY(0x1000)
        self.assertEqual(self.cpu.y_index, 0x00)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 1)
        self.cpu.LDY(0x1001)
        self.assertEqual(self.cpu.y_index, 0x01)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDY(0x1002)
        self.assertEqual(self.cpu.y_index, 0x7F)
        self.assertEqual(self.cpu.sign_flag, 0)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDY(0x1003)
        self.assertEqual(self.cpu.y_index, 0x80)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)
        self.cpu.LDY(0x1004)
        self.assertEqual(self.cpu.y_index, 0xFF)
        self.assertEqual(self.cpu.sign_flag, 1)
        self.assertEqual(self.cpu.zero_flag, 0)

    def test_STA(self):
        self.cpu.accumulator = 0x37
        self.cpu.STA(0x2000)
        self.assertEqual(self.memory.read_byte(None, 0x2000), 0x37)

    def test_STX(self):
        self.cpu.x_index = 0x38
        self.cpu.STX(0x2000)
        self.assertEqual(self.memory.read_byte(None, 0x2000), 0x38)

    def test_STY(self):
        self.cpu.y_index = 0x39
        self.cpu.STY(0x2000)
        self.assertEqual(self.memory.read_byte(None, 0x2000), 0x39)