class Test6502Bugs(unittest.TestCase): def setUp(self): self.memory = Memory() 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)