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)
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)